A control method and device of a pressure injury prevention pipe cutting machine for air path back pressure detection

Abstract

The present application relates to a kind of air path back pressure detection's control method and device of anti-pressing pipe cutting machine, it is related to metal pipe processing technical field, it includes: in response to clamping signal, obtain pipe fitting information and clamp information and determine blowing parameter, press distance and standard back pressure, the maximum value of press distance is as clamping distance, the maximum value of standard back pressure is as back pressure threshold value;Combining blowing parameter and clamping distance determines and executes preparation instruction;Air path back pressure in the inside of clamp is collected;If air path back pressure is not less than back pressure threshold value, then control clamp stop moving and obtain moving distance;When moving distance is consistent with clamping distance, based on air floatation parameter, blow out airflow;When moving distance is less than clamping distance, control clamp reset;According to moving distance and clamping distance determine foreign matter size;Combined with foreign matter size, correct preparation instruction and recollect air path back pressure.The present application has the effect of reducing the pipe surface press injury caused by scrap, improve pipe processing quality.

Description

Technical Field

[0001] This invention relates to the field of metal pipe processing technology, and in particular to a control method and device for a pipe cutting machine that uses air back pressure detection to prevent pressure damage. Background Technology

[0002] In the field of metal pipe processing technology, pipe cutting is the core blanking process in parts production and is widely used in industries such as automobiles, aerospace, building decoration, and hardware manufacturing.

[0003] In the cutting of metal pipes such as aluminum alloy and stainless steel decorative tubes, the pipe is first fed to the designated station and clamped and fixed by a fixture. Then, the pipe is cut with a saw blade. Long pipes can be cut into multiple sections of the required size. After processing, the pipe ends are flat and burr-free. The processing efficiency is high and it is suitable for batch cutting of various metal pipes.

[0004] However, the chips generated during cutting are prone to splashing and adhering to the surface of the clamp jaws or the pipe surface. When the clamp is closed forcefully, the hard chips will press pits into the surface of the pipe, affecting the surface quality of the finished product. Summary of the Invention

[0005] To reduce surface damage to pipes caused by debris and improve pipe processing quality, this invention provides a control method and device for a pipe cutting machine with air back pressure detection to prevent pressure damage.

[0006] In a first aspect, the present invention provides a control method for a pipe cutting machine that prevents pressure damage by detecting back pressure in the air path, which adopts the following technical solution: A control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection includes: S10: In response to the clamping signal, acquire pipe fitting information and clamp information; S11: Determine the air blowing parameters, downward pressure distance, and standard back pressure corresponding to the downward pressure distance based on the pipe fitting information and clamp information. The value of the downward pressure distance is the downward pressure range. The maximum value of the downward pressure distance is used as the clamping distance, and the maximum value of the standard back pressure is used as the back pressure threshold. S12: Based on the air blowing parameters and clamping distance, determine the preparation command to first perform the air blowing cleaning action and then the downward clamping action; S13: Execute the preparation command and collect the preset air back pressure inside the clamp; S14: If the back pressure of the air path is not less than the back pressure threshold, control the clamp to stop moving and obtain the moving distance; S15: When the moving distance is consistent with the clamping distance, the airflow is blown out based on the preset air flotation parameters to complete the preparation work; S16: When the moving distance is less than the clamping distance, control the clamp to reset; S17: Determine the size of the foreign object based on the moving distance and clamping distance; S18: Combine the foreign object size correction preparation command and restart execution from S13.

[0007] By adopting the above technical solution, the debris between the clamp and the pipe can be cleaned in advance by blowing air to clean it first and then pressing down to clamp. Combined with the determination of the back pressure threshold, the risk of foreign objects can be identified before the clamp contacts the pipe, reducing the risk of crushing defects on the pipe surface caused by the extrusion of debris and improving the surface quality of the pipe processing.

[0008] Optional methods for determining the downward pressure range and standard back pressure include: S20: Determine the influencing pores and their corresponding initial clearances based on the pipe fitting information and clamp information; S21: Select the smallest initial gap from the initial gaps and use it as the upper limit, and combine it with 0 as the lower limit to obtain the pressure range; S22: The downward gap is calculated based on the downward distance and the initial gap; S23: Determine the basic back pressure based on the blowing parameters, based on the adjustment coefficient of the downward pressure gap corresponding to the vent. S24: The standard back pressure corresponding to the downward pressure distance is calculated by combining the basic back pressure and the adjustment coefficient.

[0009] By adopting the above technical solution, the initial gap is used to determine the pressure range, and the influence of the gap on the back pressure is quantified by the adjustment coefficient. This makes the calculation of the standard back pressure fit the actual working conditions, providing a reliable benchmark value for subsequent back pressure anomaly judgment and reducing the misjudgment rate.

[0010] Optionally, methods for modifying the preparation instructions include: S30: Determine the required parameters based on the size of the foreign object and the clamp information; S31: Determine abnormal and normal zones by combining pipe fitting information, clamp information, and standard back pressure; S32: Determine the area proportion of abnormal partitions based on abnormal partitions and normal partitions; S33: Determine the parameters of action based on regional proportion and demand parameters; S34: Replace the blowing parameters with the action parameters and block the normal zones to obtain the corrected preparation instructions.

[0011] By adopting the above technical solution, the required parameters are determined based on the size of the foreign object, the air holes corresponding to the normal zone are blocked, and the airflow pressure is concentrated to blow away the foreign object in the abnormal area. At the same time, the action parameters are optimized based on the proportion of the abnormal zone, thereby improving the cleaning efficiency and reducing the waste of air source.

[0012] Optional methods for correcting standard back pressure include: S40: Screen the pores and their corresponding pressure gaps located in the abnormal zone; S41: Matching correction coefficient based on the selected downward pressure gap; S42: Back pressure correction based on matching action parameters; S43: The corrected standard back pressure is calculated by combining the correction factor and the corrected back pressure.

[0013] By adopting the above technical solution, since the blowing parameters are replaced by the action parameters, the standard back pressure calculated using the blowing parameters cannot adapt to the working conditions corresponding to the action parameters, and needs to be corrected accordingly to ensure the accuracy of subsequent back pressure detection.

[0014] Optional methods for determining abnormal and normal partitions include: S50: Determine the fitting gap that affects the pores based on the initial gap and clamping distance; S51: Determine the pore zones and their corresponding degree of influence by combining the influence of pores and the bonding gap; S52: Determine the standard plugging back pressure corresponding to the pore zone based on the degree of influence and the standard back pressure; S53: Seal the pores that affect the pore area in the pore area and collect the back pressure of the pore blockage; S54: Combine the standard plugging back pressure and the gas path plugging back pressure to determine the abnormal zone and the normal zone.

[0015] By adopting the above technical solution, the different pressure relief capabilities of different pore zones for the entire structure are utilized. The standard back pressure is calculated in combination with the standard back pressure to determine the standard back pressure after sealing the pores under normal operating conditions. Then, the pores that affect the pore zone are actively sealed and the back pressure of the gas path sealing is collected. The back pressure of the gas path sealing is compared with the standard back pressure to distinguish the foreign object zone from the normal zone.

[0016] Optional methods for determining abnormal and normal partitions include: S60: Based on the same pore zone, compare the standard plugging back pressure and the gas path plugging back pressure; S61: If only one vent partition has a standard plugging back pressure that matches the gas path plugging back pressure, then that vent partition is determined to be an abnormal partition, and the other vent partitions are normal partitions. S62: If the standard plugging back pressure and the gas path plugging back pressure are inconsistent for all venting zones, then calculate the back pressure deviation rate based on the standard plugging back pressure and the gas path plugging back pressure. S63: Calculate and determine the average deviation based on the back pressure deviation rate; S64: Determine the pore zone corresponding to the back pressure deviation rate that is greater than the average deviation as the normal zone, and determine the pore zone corresponding to the back pressure deviation rate that is not greater than the average deviation as the abnormal zone.

[0017] By adopting the above technical solution, when there are many foreign objects blocking the airway, it is difficult to simply compare the consistency between the standard blocking back pressure and the gas path blocking back pressure. By screening abnormal zones through deviation rate and average deviation, the comprehensiveness and accuracy of zone determination are improved, which can cover complex working conditions with many foreign objects coexisting.

[0018] Optionally, after the average deviation is determined, it includes: S70: Determine the deviation range by combining the average deviation and the preset redundancy coefficient; S71: Compare back pressure deviation rate and deviation range; S72: When all back pressure deviation rates are within the deviation range, all pore zones are determined to be abnormal zones. S73: When the back pressure deviation rate is not within the deviation range, execute S64.

[0019] By adopting the above technical solution, a redundancy coefficient is introduced to construct a deviation range. If the deviation rate is within the range, it is judged as an anomaly in the entire zone, which reduces misjudgment caused by airflow fluctuations and makes the judgment results more consistent with the actual working conditions.

[0020] Optionally, after performing the air blowing cleaning action, the following may also be included: S80: Determine the initial back pressure and collect the air path back pressure based on the clamp information and blowing parameters; S81: If the back pressure of the gas path is greater than the initial back pressure, determine the pressure difference by combining the back pressure of the gas path and the initial back pressure. S82: Determine unblocking parameters by using pressure difference and air blowing parameters; S83: Continue the air blowing action based on the unblocking parameters until the back pressure of the air passage is consistent with the initial back pressure.

[0021] By adopting the above technical solution, the initial back pressure is used to determine whether the air holes on the clamp surface are blocked at the starting position. If it is determined that there is foreign matter blocking the air, the blowing intensity is increased until the back pressure is restored to the standard condition, ensuring that the debris on the clamp surface is cleaned.

[0022] Optionally, after collecting the back pressure of the gas path, the following may also be included: S90: Determine the back pressure mutation threshold based on pipe fitting information and clamp information; S91: Determine the back pressure rise rate based on the back pressure of the gas path; S92: When the rate of increase of back pressure is not less than the back pressure sudden change threshold, obtain the moving distance and define the standard back pressure corresponding to the downward pressure distance that is consistent with the moving distance as the abnormal back pressure. S93: If the back pressure in the gas path is greater than the abnormal back pressure, the control clamp will reset and execute S17 to S18.

[0023] By adopting the above technical solution, the back pressure rise rate is increased to determine abnormal working conditions, and special cases are accurately identified where the clamp is blocked by foreign objects, but the back pressure of the air path does not exceed the back pressure threshold due to the gap between other air holes and pipes.

[0024] Secondly, this application provides a pressure-damage prevention pipe cutting machine device for detecting air back pressure, which adopts the following technical solution: A pressure-damage-preventing pipe cutting machine device for detecting back pressure in the air path, applied to a control method for a pressure-damage-preventing pipe cutting machine for detecting back pressure in the air path in the first aspect, includes a cutting structure for cutting pipes, and a cutting machine body for mounting the cutting structure and feeding and conveying the pipes. A clamping structure for clamping and fixing the pipes is installed on the cutting machine body, and the clamping structure is located on one side of the cutting structure.

[0025] By adopting the above technical solution, the cutting structure and clamping structure are set up in a coordinated manner to realize the integrated processing of pipe clamping and cutting, reduce the error caused by the movement of the pipe during processing, and improve the quality of pipe processing.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: Blowing air to clean before pressing down and clamping can remove debris between the clamp and the pipe in advance. Combined with the determination of the back pressure threshold, the risk of foreign objects can be identified before the clamp contacts the pipe, reducing the risk of pressure damage defects on the pipe surface caused by debris compression and improving the surface quality of pipe processing. By utilizing the different pressure relief capabilities of different pore zones for the entire structure, and combining the standard back pressure, the standard sealing back pressure after sealing the pores under normal operating conditions is calculated. Then, the pores that affect the pore zone are actively sealed and the gas path sealing back pressure is collected. The gas path sealing back pressure is compared with the standard sealing back pressure to distinguish the foreign object zone from the normal zone. The cutting and clamping structures are designed in tandem to achieve integrated processing of pipe clamping and cutting, reducing errors caused by pipe movement during processing that reduce cutting accuracy and improving pipe processing quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a pressure-damage-preventing pipe cutting machine for air back pressure detection according to this application; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a simplified structural diagram of the clamping structure of this application.

[0028] The parts referred to by the numbers in the above attached figures are as follows: 1. Cutting machine body; 2. Cutting structure; 3. Clamping structure; 31. Drive component; 32. Clamp; 321. Hollow cavity; 322. Array-type micro air outlet; 323. Solenoid valve; 324. Air source equipment; 325. Pressure sensor. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a pipe cutting machine device for detecting back pressure in the air path to prevent pressure damage.

[0031] Reference Figure 1 and Figure 2 A pressure-damage-preventing pipe cutting machine device for back pressure detection includes a cutting structure 2 for cutting pipes, and a cutting machine body 1 for mounting the cutting structure 2 and feeding and conveying the pipes. The cutting machine body 1 is equipped with a clamping structure 3 for clamping and fixing the pipes, and the clamping structure 3 is located on one side of the cutting structure 2.

[0032] The clamping structure 3 includes a drive component 31 and a clamp 32. The drive component 31 is a servo electric cylinder. The output end of the servo electric cylinder is fixedly connected to the clamp 32. The servo electric cylinder drives the clamp 32 to move in a direction away from or close to the pipe.

[0033] The pipe is placed on the main body 1 of the cutting machine and transported through the processing area of ​​the cutting structure 2. When the pipe stops moving, the drive component 31 drives the clamp 32 to approach the pipe and clamp the pipe on the main body 1 to complete the fixation. The cutting structure 2 is then driven to cut the pipe. After cutting, the drive component 31 resets and drives the clamp 32 away from the pipe. The pipe continues to move under the control of the main body 1. The uncut pipe pushes the cut pipe out of the machine. The above steps are repeated to complete the cutting of the pipe.

[0034] Reference Figure 3 The clamp 32 has a hollow cavity 321 inside. The clamp 32 has an array of miniature air outlets 322 that communicate with the hollow cavity 321 on the side near the pipe. The hollow cavity 321 is connected to the air source device 324 through the solenoid valve 323, forming a detection air path in which the air source device 324, the solenoid valve 323, the hollow cavity 321 and the array of miniature air outlets 322 are connected in sequence. A pressure sensor 325 is installed on the air path between the solenoid valve 323 and the hollow cavity 321.

[0035] Based on the same inventive concept, embodiments of the present invention provide a control method for a pipe cutting machine that prevents pressure damage by detecting back pressure in the air path.

[0036] A control method for a pipe cutting machine with air back pressure detection to prevent pressure damage includes the following steps: S10: In response to the clamping signal, acquire fitting information and clamp information.

[0037] The clamping signal is the instruction signal that triggers the drive component 31 to drive the clamp 32 to gradually approach the pipe to perform the clamping action; when the system detects that the pipe to be processed is transported to the processing area of ​​the cutting structure 2, it automatically outputs the clamping signal.

[0038] Pipe fitting information refers to the collection of geometric and physical property parameters of the pipe fittings to be processed. The relevant parameters are obtained based on the actual pipe model of the processing order and integrated into the pipe fitting information. The operator enters the information into the system in advance and reads it directly when needed.

[0039] Clamp information refers to the combination of the structural parameters of clamp 32 and the internal detection air path parameters of clamp 32; the clamp information is obtained by integrating the calibration parameters of clamp 32 at the factory, which is pre-entered into the system by the operator and read directly when in use.

[0040] S11: Determine the air blowing parameters, downward pressure distance, and standard back pressure corresponding to the downward pressure distance based on the pipe fitting information and clamp information. The downward pressure distance is taken as the downward pressure range. The maximum value of the downward pressure distance is taken as the clamping distance, and the maximum value of the standard back pressure is taken as the back pressure threshold.

[0041] The air blowing parameters refer to the execution parameters of the air source device 324 supplying air to the hollow cavity 321 through the solenoid valve 323, including the high-pressure cleaning parameters and low-pressure detection parameters executed sequentially. The basic parameters are determined based on the pipe material and pipe roughness in the pipe information, and the high-pressure cleaning parameters and low-pressure detection parameters are calculated by combining the air hole area in the clamp information and the basic parameters, and then integrated to obtain the air blowing parameters.

[0042] The downward pressure distance refers to the vertical distance that the clamp 32 moves downward from its initial position to a certain position; after determining the downward pressure range, the downward pressure distance can be any value within the downward pressure range.

[0043] Standard back pressure refers to the steady-state pressure value in the detection air path of clamp 32 when clamp 32 is moved down to a certain downward pressure distance under standard operating conditions without debris or foreign objects. Standard back pressure corresponds one-to-one with downward pressure distance. The method for determining standard back pressure will be disclosed in detail in subsequent steps and will not be repeated here.

[0044] The downward pressure range refers to the range of movement of the clamp 32 from its initial position to the position where it fully clamps the pipe; the method for determining the downward pressure range will be disclosed in detail in subsequent steps and will not be repeated here.

[0045] The clamping distance refers to the downward pressure distance when the clamp 32 clamps the pipe; the maximum value of the downward pressure distance is directly used as the clamping distance. When the downward pressure distance is obtained, it is directly filtered and entered into the system.

[0046] Back pressure threshold refers to the core threshold for determining whether there are debris or foreign objects in the gas path; the maximum value is selected from all standard back pressures, which is the back pressure threshold.

[0047] S12: Based on the air blowing parameters and clamping distance, determine the preparation command to first perform the air blowing cleaning action and then the downward clamping action.

[0048] The preparation command refers to the sequence control command that controls the clamp 32 to perform the air blowing cleaning action and the downward clamping action in sequence. The high pressure cleaning parameter and low pressure detection parameter are read from the air blowing parameter. The operation steps of controlling the clamp 32 to perform the preset blowing time with the high pressure cleaning parameter, then move downward with the clamping distance and perform air blowing with the low pressure detection parameter are converted into control commands to obtain the preparation command. The blowing time is set in advance by the operator according to the surface cleanliness of the pipe fitting and entered into the system.

[0049] S13: Execute the preparation command and collect the preset air back pressure inside the clamp 32.

[0050] The clamp 32 is an actuator in the clamping structure 3 used to hold the pipe to be processed. The clamp 32 is driven by the driving component 31 to move closer to or away from the pipe to be processed. It has a hollow cavity 321 inside.

[0051] Back pressure in the air path refers to the actual pressure value detected in the air path inside the clamp 32 during the downward pressing process; it is obtained in real time by the pressure sensor 325 pre-set in the detection air path.

[0052] S14: If the back pressure of the air path is not less than the back pressure threshold, control the clamp 32 to stop moving and obtain the moving distance.

[0053] If the back pressure of the air circuit is not less than the back pressure threshold, it means that the back pressure of the air circuit has reached the maximum value under standard operating conditions. This may be due to the clamp 32 being in a compressed state with the pipe fitting or the air hole being blocked by foreign objects. In both cases, the clamp 32 needs to be stopped from moving.

[0054] The moving distance refers to the actual vertical distance of the clamp 32 from its initial position to its stop position; it is acquired in real time by a displacement sensor that is pre-set on the drive component 31 connected to the clamp 32.

[0055] S15: When the moving distance is consistent with the clamping distance, airflow is blown out based on the preset air flotation parameters to complete the preparation work.

[0056] The fact that the moving distance is the same as the clamping distance indicates that the clamp 32 has moved to the position that fits the pipe fitting, completing the preparation work for clamping the pipe fitting, and the subsequent process can be carried out.

[0057] The air flotation parameter refers to the parameter of the airflow ejected in the millisecond time before full clamping. This airflow uses the air flotation effect to form a layer of air micro-spring between the workpiece and the clamp 32, ensuring that the clamp 32 gently contacts the workpiece; it is preset by the operator and entered into the system.

[0058] S16: When the moving distance is less than the clamping distance, control the clamp 32 to reset.

[0059] If the moving distance is less than the clamping distance, it means that the clamp 32 has not yet moved to the position of fitting the pipe. This indicates that the reason why the back pressure of the air circuit is not less than the back pressure threshold is that foreign objects are blocking the air hole. The foreign objects need to be cleaned. Therefore, the clamp 32 is first controlled to rise and reset.

[0060] There is no situation where the moving distance is greater than the clamping distance, so it does not need to be included in the judgment.

[0061] S17: Determine the size of the foreign object based on the moving distance and clamping distance.

[0062] The foreign object size refers to the equivalent size of the debris between the clamp 32 and the pipe; the foreign object size is calculated by subtracting the moving distance and the clamping distance.

[0063] S18: Combine the foreign object size correction preparation command and restart execution from S13.

[0064] Combine the high-pressure cleaning steps in the foreign object size correction preparation instruction and restart from S13. The specific correction method will be disclosed in detail in subsequent steps and will not be repeated here.

[0065] The method for determining the downward pressure range and standard back pressure includes the following steps: S20: Determine the influencing pores and their corresponding initial clearances based on the pipe fitting information and clamp information.

[0066] Influencing pores refer to the array of pores on the clamping surface of the clamp 32 that can affect the back pressure of the air passage. Based on the outer diameter of the pipe in the pipe information and the distribution position of the pores in the clamp information, the pores that can blow out airflow acting on the surface of the pipe are identified by screening through a three-dimensional contact model, i.e., influencing pores.

[0067] The initial gap refers to the vertical distance between the vent and the pipe surface when the clamp 32 is in the initial position. The precise parameters required for modeling are extracted from the pipe information and clamp information. The geometric modeling is completed using simulation software. Based on the three-dimensional geometry, the minimum distance from the surface node to the main surface is calculated along the normal of the contact surface, which is the initial gap. The initial gap corresponds one-to-one with the vent.

[0068] S21: Select the smallest initial gap from the initial gaps and use it as the upper limit, and combine it with 0 as the lower limit to obtain the pressure range.

[0069] The minimum initial gap is used as the upper limit of the pressure interval, and 0 is used as the lower limit of the pressure interval. The pressure interval is obtained by combining these two values.

[0070] S22: The downward gap is calculated based on the downward distance and the initial gap.

[0071] The downward pressure clearance refers to the vertical distance between the air hole and the pipe surface when the clamp 32 moves with a downward pressure distance. The downward pressure clearance corresponds one-to-one with the initial clearance. The downward pressure clearance is calculated by subtracting the initial clearance from the downward pressure distance.

[0072] S23: Determine the base back pressure based on the blowing parameters, using the adjustment coefficient of the downward pressure gap corresponding to the vent.

[0073] The adjustment coefficient is a coefficient used to quantify the impact of the downpressure gap on the back pressure of the gas path. All downpressure gaps are arranged from smallest to largest to form a set, and then divided into multiple sub-intervals with equal width. The midpoint value of each sub-interval is used as the representative gap of that interval. The average gap and gap range are determined by combining all representative gaps. The corresponding adjustment coefficient is then looked up from the adjustment correspondence table based on the average gap and gap range. The adjustment correspondence table is a data table that records different average gaps and gap ranges and their corresponding adjustment coefficients, which is obtained by technicians through prior testing.

[0074] Base back pressure refers to the air pressure value determined solely by the air blowing parameters, without considering the influence of air gaps. Low-pressure detection parameters are read from the air blowing parameters, and the corresponding base back pressure is looked up from the back pressure correspondence table based on the low-pressure detection parameters. The back pressure correspondence table is a data table that records different low-pressure detection parameters and their corresponding base back pressures, which is obtained by technicians through prior testing.

[0075] S24: The standard back pressure corresponding to the downward pressure distance is calculated by combining the basic back pressure and the adjustment coefficient.

[0076] The standard back pressure is calculated by multiplying the base back pressure and the adjustment coefficient. The standard back pressure corresponds one-to-one with the downward pressure distance.

[0077] The method for preparing the correction instructions includes the following steps: S30: Determine the required parameters based on the size of the foreign object and the clamp information.

[0078] The required parameters refer to the air blowing parameters needed to purge and remove foreign objects. The required force is retrieved from the force correspondence table based on the size of the foreign object. The force correspondence table is a data table that records different foreign object sizes and their corresponding required forces. It is obtained by technicians through prior testing. A three-dimensional model of the clamp is constructed based on the clamp information. The required force is substituted into the three-dimensional model of the clamp to calculate the execution parameters in the detection air path, i.e., the required parameters.

[0079] S31: Determine abnormal and normal zones by combining pipe fitting information, clamp information, and standard back pressure.

[0080] An abnormal zone refers to a zone in the pore area that is in contact with clamp 32 where there are debris or foreign objects; the specific method for determining an abnormal zone will be disclosed in detail in subsequent steps and will not be repeated here.

[0081] A normal zone refers to a zone in contact with clamp 32 where there are no debris or foreign objects. The specific method for determining abnormal zones will be disclosed in detail in subsequent steps and will not be repeated here.

[0082] S32: Determine the area proportion of abnormal partitions based on abnormal partitions and normal partitions.

[0083] The area ratio refers to the ratio of the total area of ​​the abnormal partitions to the total area of ​​the contact area of ​​clamp 32; after calculating the area of ​​all abnormal partitions, it is divided by the total area of ​​the contact area of ​​clamp 32.

[0084] S33: Determine the parameters of action based on the regional proportion and demand parameters.

[0085] The action parameter refers to the specific air blowing execution parameters used for directional purging of foreign objects; the action parameter is calculated by multiplying the area proportion and the demand parameter according to the data in the area proportion.

[0086] S34: Replace the blowing parameters with the action parameters and block the normal zones to obtain the corrected preparation instructions.

[0087] The low-pressure detection parameter in the blowing parameters is replaced by the action parameters. At the same time, the sealing structure preset inside the clamp 32 is controlled to block the air holes in the normal zone, so that the airflow only blows out from the air holes in the abnormal zone. After integration, the corrected preparation command is obtained.

[0088] When an influencing pore is identified, the default control blockage structure will block the non-influencing pores, and the influence of the non-influencing pores will not be considered in subsequent calculations.

[0089] The standard back pressure correction method includes the following steps: S40: Filter the pores and their corresponding pressure gaps located in the abnormal zone.

[0090] Since the pores affecting the normal zone have been blocked, we only need to consider the pores affecting the abnormal zone. Therefore, we select the pores affecting the abnormal zone and their corresponding pressure gaps from all the pores affecting the abnormal zone.

[0091] S41: Matching correction coefficient based on the selected downward pressure gap.

[0092] The correction factor is a coefficient used to quantify the impact of the downpressure gap of the abnormal zone on the back pressure of the gas path; similar to the method of determining the adjustment factor, the corresponding correction factor is looked up from the adjustment correspondence table.

[0093] S42: Back pressure correction based on action parameter matching.

[0094] Corrected back pressure refers to the air pressure value determined solely by the operating parameters, without considering the influence of air gaps. Similar to the method for determining the basic back pressure, the corresponding corrected back pressure is obtained by looking up the back pressure correspondence table based on the operating parameters.

[0095] S43: The corrected standard back pressure is calculated by combining the correction factor and the corrected back pressure.

[0096] The corrected standard back pressure is calculated by multiplying the correction factor with the corrected back pressure. The standard back pressure corresponds one-to-one with the downward pressure distance.

[0097] The method for determining abnormal and normal partitions includes the following steps: S50: Determine the fitting gap that affects the pores based on the initial gap and clamping distance.

[0098] The fitting gap refers to the vertical distance between the pores and the pipe surface when the clamp 32 is pressed down to the clamping distance. The fitting gap corresponding to the pores is calculated by subtracting the initial gap from the clamping distance.

[0099] S51: Determine the pore zones and their corresponding degree of influence by combining the influence of pores and the bonding gap.

[0100] The degree of influence refers to the proportion of the pressure relief capacity of a certain vent zone to the total pressure relief capacity of the clamp 32 contact area; it is calculated according to the formula: ,in To the extent of the impact, This refers to the fitting gap within the pore zone that affects the pores.

[0101] S52: Determine the standard plugging back pressure corresponding to the pore zone based on the degree of influence and the standard back pressure.

[0102] Standard plugging back pressure refers to the theoretical steady-state pressure value measured in the gas path after plugging the affected vents in a certain vent section; it is calculated using the following formula: ,in The standard sealing back pressure for a specific pore zone. Standard back pressure, This is the blocking correction factor.

[0103] S53: Seal the pores affecting the pore zone and collect the back pressure of the gas path sealing.

[0104] Back pressure of gas path blockage refers to the actual steady-state pressure value in the gas path after the actual blockage of a certain gas path zone. It is obtained in real time by the pressure sensor 325 in the gas path.

[0105] S54: Combine the standard plugging back pressure and the gas path plugging back pressure to determine the abnormal zone and the normal zone.

[0106] Abnormal and normal zones are determined by combining the standard blocking back pressure and the gas path blocking back pressure. The specific determination method will be disclosed in detail in subsequent steps and will not be repeated here.

[0107] The method for determining abnormal and normal partitions also includes the following steps: S60: Based on the same pore zone, compare the standard plugging back pressure and the gas path plugging back pressure.

[0108] Based on the same pore zone, the standard sealing back pressure and the gas path sealing back pressure are compared.

[0109] S61: If only one pore zone has a standard plugging back pressure that matches the gas path plugging back pressure, then that pore zone is determined to be an abnormal zone, and the other pore zones are normal zones.

[0110] If only one venting zone has a standard plugging back pressure that matches the gas path plugging back pressure, it means that the pressure relief capacity of other venting zones has not been affected. This indicates that there are no foreign objects in other venting zones. If the foreign object is located in this venting zone, then this venting zone is an abnormal zone, while the other venting zones are normal zones.

[0111] S62: If the standard plugging back pressure and the gas path plugging back pressure are inconsistent for all venting zones, then calculate the back pressure deviation rate based on the standard plugging back pressure and the gas path plugging back pressure.

[0112] The fact that the standard plugging back pressure and the gas path plugging back pressure are inconsistent for all venting zones indicates that there are foreign objects in more than one venting zone. When there are foreign objects in multiple venting zones, no matter which individual venting zone is actively plugged, the collected gas path plugging back pressure will not be consistent with its corresponding standard plugging back pressure, and it is necessary to further determine the zone where the foreign object is located.

[0113] Back pressure deviation rate refers to the degree of deviation of the gas path sealing back pressure in each venting zone from the standard sealing back pressure; the back pressure deviation rate corresponding to that venting zone is calculated by subtracting the gas path sealing back pressure from the standard sealing back pressure and then dividing the result of the difference by the standard sealing back pressure.

[0114] S63: Calculate and determine the average deviation based on the back pressure deviation rate.

[0115] The average deviation is the arithmetic mean of the back pressure deviation rates corresponding to all pore zones. The average deviation is calculated by summing the back pressure deviation rates of all pore zones and then dividing the result by the number of pore zones.

[0116] S64: Determine the pore zone corresponding to the back pressure deviation rate that is greater than the average deviation as the normal zone, and determine the pore zone corresponding to the back pressure deviation rate that is not greater than the average deviation as the abnormal zone.

[0117] When a normal zone is actively blocked, all foreign objects will affect the back pressure of the gas path blockage. Therefore, the deviation of its corresponding back pressure from the standard back pressure will be greater. When an abnormal zone is actively blocked, the foreign objects in it will not affect the back pressure of the gas path blockage. Therefore, the deviation of its corresponding back pressure from the standard back pressure will be smaller. In summary, the venting zone with a back pressure deviation rate greater than the average deviation is determined to be a normal zone, and the venting zone with a back pressure deviation rate not greater than the average deviation is determined to be an abnormal zone.

[0118] After the average deviation is determined, the following steps are included: S70: Determine the deviation range by combining the average deviation and the preset redundancy coefficient.

[0119] The redundancy coefficient is a coefficient used to expand the range of average deviation judgment; it is calibrated by fluctuation test under standard working conditions, obtained in advance by the operator and then entered into the system. In this embodiment, the value is 0.1.

[0120] The deviation interval refers to the range of back pressure deviation rate determined by the average deviation and the redundancy coefficient. It is obtained from the interval expression, which is: ,in The average deviation, This is the redundancy coefficient.

[0121] S71: Compare back pressure deviation rate and deviation range.

[0122] The back pressure deviation rate is compared with the deviation range, and the abnormal and normal zones are determined based on the comparison results.

[0123] S72: When all back pressure deviation rates are within the deviation range, all pore zones are determined to be abnormal zones.

[0124] All back pressure deviation rates are within the deviation range, indicating that the back pressure deviation rates corresponding to all pore zones are at similar levels. This suggests that the pores in all pore zones are blocked, therefore all pore zones are determined to be abnormal zones.

[0125] S73: When the back pressure deviation rate is not within the deviation range, execute S64.

[0126] If the back pressure deviation rate is not within the deviation range, it means that not all pore zones are blocked. The abnormal and normal zones can be determined according to the determination method in S64.

[0127] The following steps are included after the air blowing cleaning action: S80: Determine the initial back pressure and collect the air path back pressure based on the clamp information and blowing parameters.

[0128] Initial back pressure refers to the steady-state pressure value in the air path detected at the initial stage of the blowing cleaning action, before the clamp 32 has pressed down and moved; it is obtained by the pressure sensor 325 in the air path.

[0129] S81: If the back pressure of the gas path is greater than the initial back pressure, determine the pressure difference by combining the back pressure of the gas path and the initial back pressure.

[0130] If the back pressure in the air path is greater than the initial back pressure, it means that the pressure value in the air path has changed even when it is not affected by the fittings. This indicates that there are foreign objects at the air holes on the surface of the clamp 32, which need to be cleaned.

[0131] The pressure difference refers to the difference between the back pressure of the gas path and the initial back pressure; the pressure difference is obtained by calculating the difference between the back pressure of the gas path and the initial back pressure.

[0132] Normally, there is no situation where the back pressure of the air passage is less than the initial back pressure, so it does not need to be included in the judgment. However, if the back pressure of the air passage is the same as the initial back pressure, it means that there is no abnormality and the clamp 32 can be controlled to press down and move.

[0133] S82: Determine the unblocking parameters by using pressure difference and air blowing parameters.

[0134] Unblocking parameters refer to the air blowing parameters used to clear foreign objects from blocked air vents. The greater the pressure difference, the higher the unblocking parameter. The corresponding unblocking parameter is found in the unblocking correspondence table based on the pressure difference. The unblocking correspondence table is a data table that records different pressure differences and their corresponding unblocking parameters, which is obtained by technicians through prior testing.

[0135] S83: Continue the air blowing action based on the unblocking parameters until the back pressure of the air passage is consistent with the initial back pressure.

[0136] The back pressure of the air path is consistent with the initial back pressure, which means that the foreign objects in the surface pores of clamp 32 have been removed. The execution parameters for blowing air can be adjusted from the unblocking parameters back to the low-pressure detection parameters.

[0137] After collecting the back pressure of the gas path, the following steps are also included: S90: Determine the back pressure mutation threshold based on the pipe fitting information and clamp information.

[0138] The back pressure mutation threshold refers to the speed threshold for determining whether the back pressure in the gas path has an abnormal sudden increase. A dynamic correlation model between gap and back pressure is constructed based on the pipe fitting information and clamp information. The rate of increase of back pressure under standard operating conditions is calculated. The multiplier coefficient is matched according to the pre-set required accuracy. The back pressure mutation threshold is calculated by multiplying the multiplier coefficient and the rate of increase. The multiplier coefficient is usually between 3 and 5.

[0139] S91: Determine the back pressure rise rate based on the back pressure of the gas path.

[0140] The back pressure rise rate refers to the actual rate at which the back pressure in the gas path rises. Based on the back pressure of the gas path obtained before and after a preset unit time, the difference between the two back pressures is calculated and the result is divided with the unit time to obtain the back pressure rise rate.

[0141] S92: When the rate of increase of back pressure is not less than the back pressure mutation threshold, obtain the moving distance and define the standard back pressure corresponding to the downward pressure distance that is consistent with the moving distance as the abnormal back pressure.

[0142] If the rate of increase of back pressure is not less than the back pressure sudden change threshold, it means that the back pressure of the air path suddenly increases. It is determined that the clamp 32 has been attached to the surface of the pipe, causing the air hole to be blocked, or the clamp 32 has come into contact with a foreign object, thus blocking the air hole. However, due to the large size of the foreign object, there is still a certain gap between the clamp 32 and the pipe. This gap causes the air holes in other positions to be affected by the increased gap, resulting in the corresponding back pressure of the air path not exceeding the back pressure threshold and not meeting the judgment condition in S14.

[0143] Abnormal back pressure refers to the standard back pressure value corresponding to the downward pressure distance when the rate of back pressure rise exceeds the standard; look up the standard back pressure corresponding to this downward pressure distance and define it as abnormal back pressure.

[0144] S93: If the back pressure of the gas path is greater than the abnormal back pressure, control clamp 32 to reset and execute S17 to S18.

[0145] If the back pressure of the air passage is greater than the abnormal back pressure, it means that the back pressure of the air passage has exceeded the abnormal back pressure before the clamp 32 has moved to the surface of the fitting. This means that there is a foreign object blocking the air hole. It is necessary to control the clamp 32 to reset and execute S17 to S18 to remove the foreign object.

[0146] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A control method for a pipe cutting machine with air back pressure detection to prevent pressure damage, characterized in that, include: S10: In response to the clamping signal, acquire pipe fitting information and clamp information; S11: Determine the air blowing parameters, downward pressure distance, and standard back pressure corresponding to the downward pressure distance based on the pipe fitting information and clamp information. Define the range of values ​​for the downward pressure distance as the downward pressure interval, take the maximum value of the downward pressure distance as the clamping distance, and take the maximum value of the standard back pressure as the back pressure threshold. S12: Based on the air blowing parameters and clamping distance, determine the preparation command to first perform the air blowing cleaning action and then the downward clamping action; S13: Execute the preparation command and collect the preset back pressure of the air passage inside the clamp (32); S14: If the back pressure of the air path is not less than the back pressure threshold, control the clamp (32) to stop moving and obtain the moving distance; S15: When the moving distance is consistent with the clamping distance, the airflow is blown out based on the preset air flotation parameters to complete the preparation work; S16: When the moving distance is less than the clamping distance, control the clamp (32) to reset; S17: Determine the size of the foreign object based on the moving distance and clamping distance; S18: Combine the foreign object size correction preparation command and restart execution from S13.

2. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 1, characterized in that, Methods for determining the downward pressure range and standard back pressure include: S20: Determine the influencing pores and their corresponding initial clearances based on the pipe fitting information and clamp information; S21: Select the smallest initial gap from the initial gaps and use it as the upper limit, and combine it with 0 as the lower limit to obtain the pressure range; S22: The downward gap is calculated based on the downward distance and the initial gap; S23: Determine the basic back pressure based on the blowing parameters, based on the adjustment coefficient of the downward pressure gap corresponding to the vent. S24: The standard back pressure corresponding to the downward pressure distance is calculated by combining the basic back pressure and the adjustment coefficient.

3. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 2, characterized in that, The methods for correcting preparation instructions include: S30: Determine the required parameters based on the size of the foreign object and the clamp information; S31: Determine abnormal and normal zones by combining pipe fitting information, clamp information, and standard back pressure; S32: Determine the area proportion of abnormal partitions based on abnormal partitions and normal partitions; S33: Determine the parameters of action based on regional proportion and demand parameters; S34: Replace the blowing parameters with the action parameters and block the normal zones to obtain the corrected preparation instructions.

4. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 3, characterized in that, The correction methods for standard back pressure include: S40: Screen the pores and their corresponding pressure gaps located in the abnormal zone; S41: Matching correction coefficient based on the selected downward pressure gap; S42: Back pressure correction based on matching action parameters; S43: The corrected standard back pressure is calculated by combining the correction factor and the corrected back pressure.

5. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 3, characterized in that, Methods for determining abnormal and normal partitions include: S50: Determine the fitting gap that affects the pores based on the initial gap and clamping distance; S51: Determine the pore zones and their corresponding degree of influence by combining the influence of pores and the bonding gap; S52: Determine the standard plugging back pressure corresponding to the pore zone based on the degree of influence and the standard back pressure; S53: Seal the pores that affect the pore area in the pore area and collect the back pressure of the pore blockage; S54: Combine the standard plugging back pressure and the gas path plugging back pressure to determine the abnormal zone and the normal zone.

6. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 5, characterized in that, Methods for determining abnormal and normal partitions also include: S60: Based on the same pore zone, compare the standard plugging back pressure and the gas path plugging back pressure; S61: If only one vent partition has a standard plugging back pressure that matches the gas path plugging back pressure, then that vent partition is determined to be an abnormal partition, and the other vent partitions are normal partitions. S62: If the standard plugging back pressure and the gas path plugging back pressure are inconsistent for all venting zones, then calculate the back pressure deviation rate based on the standard plugging back pressure and the gas path plugging back pressure. S63: Calculate and determine the average deviation based on the back pressure deviation rate; S64: Determine the pore zone corresponding to the back pressure deviation rate that is greater than the average deviation as the normal zone, and determine the pore zone corresponding to the back pressure deviation rate that is not greater than the average deviation as the abnormal zone.

7. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 6, characterized in that, Once the average deviation is determined, it includes: S70: Determine the deviation range by combining the average deviation and the preset redundancy coefficient; S71: Compare back pressure deviation rate and deviation range; S72: When all back pressure deviation rates are within the deviation range, all pore zones are determined to be abnormal zones. S73: When the back pressure deviation rate is not within the deviation range, execute S64.

8. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 1, characterized in that, After performing the air blowing cleaning action, the following are also included: S80: Determine the initial back pressure and collect the air path back pressure based on the clamp information and blowing parameters; S81: If the back pressure of the gas path is greater than the initial back pressure, determine the pressure difference by combining the back pressure of the gas path and the initial back pressure. S82: Determine unblocking parameters by using pressure difference and air blowing parameters; S83: Continue the air blowing action based on the unblocking parameters until the back pressure of the air passage is consistent with the initial back pressure.

9. The control method for a pressure-damage-prevention pipe cutting machine with air back pressure detection according to claim 1, characterized in that, After collecting the back pressure of the gas path, the following is also included: S90: Determine the back pressure mutation threshold based on pipe fitting information and clamp information; S91: Determine the back pressure rise rate based on the back pressure of the gas path; S92: When the rate of increase of back pressure is not less than the back pressure sudden change threshold, obtain the moving distance and define the standard back pressure corresponding to the downward pressure distance that is consistent with the moving distance as the abnormal back pressure. S93: If the back pressure of the gas path is greater than the abnormal back pressure, the control clamp (32) is reset and S17 to S18 are executed.

10. A pipe cutting machine device for preventing pressure damage by detecting back pressure in the air path, applied to the control method of the pipe cutting machine for preventing pressure damage by detecting back pressure in the air path as described in any one of claims 1 to 9, comprising a cutting structure (2) for cutting the pipe, characterized in that, It also includes a cutting machine body (1) for mounting the cutting structure (2) and feeding and conveying the pipe, wherein a clamping structure (3) for clamping and fixing the pipe is installed on the cutting machine body (1), and the clamping structure (3) is located on one side of the cutting structure (2).

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