Multi-station floor heating pipe independent pressing and pressure maintaining detection control system

Abstract

The present application relates to the technical field of floor heating pipe pressing detection, and particularly relates to a multi-station floor heating pipe independent pressing and pressure maintaining detection control system; the system comprises a pressure testing device, an interactive operation unit, a pressure collecting unit, a shunt execution unit and a detection and judgment unit; the pressure testing device has multiple pressure testing stations, is used for fixing and mounting floor heating pipes to be detected, and performs sealing detection; the detection and judgment unit is used for automatically closing an air inlet control valve corresponding to the pressure testing station and starting pressure maintaining timing when detecting that the pressure of the floor heating pipe on the pressure testing station reaches a set value; after the pressure maintaining timing ends, the sealing state of the floor heating pipe on each pressure testing station is automatically judged according to the difference between the real-time pressure and the pressing reference pressure, and an air outlet control valve corresponding to the pressure testing station is driven to release pressure and reset; the software and hardware of each pressing station are completely isolated, the pressing, pressure maintaining, detection and pressure releasing processes are mutually isolated and do not interfere with each other, and independent operation of each station is realized.

Description

Technical Field

[0001] This invention relates to the field of pressure testing technology for underfloor heating pipes, and in particular to a multi-station independent pressure testing and holding control system for underfloor heating pipes. Background Technology

[0002] Underfloor heating pipes are the core basic components of low-temperature hot water radiant floor heating systems. The sealing performance and pressure resistance of these pipes directly determine the construction quality and long-term safety of the underfloor heating system. During the manufacturing and on-site acceptance stages, pressure testing and sealing tests must be conducted to identify and address quality issues such as pipe cracks, joint leaks, and pipe wall defects, preventing problems like leaks, pressure drops, and uneven heating later on.

[0003] Currently, in underfloor heating production workshops, traditional equipment for pressure testing of underfloor heating coils' sealing performance often uses pure relay hardware logic control, which has the following problems: First, the pressure holding time and pressure deviation cannot be flexibly customized: Traditional hardware circuits have fixed pressure holding time and pressure error thresholds, making it impossible to modify parameters according to different specifications of underfloor heating pipes, resulting in poor versatility and insufficient equipment adaptability; Second, the linkage logic of the air intake and exhaust valves is chaotic, lacking automated closed-loop control: Manual operation of the high-pressure air intake and exhaust valves can easily lead to overpressure testing and untimely pressure release, posing safety hazards such as pipe rupture and high-pressure gas leakage under high-pressure conditions. Furthermore, the valve cannot automatically close and maintain pressure after the pressure reaches the target, requiring manual operation throughout the process. Third, the operational status is poorly visualized, lacking a unified human-machine interface: there is no centralized monitoring interface with a touch screen, making it impossible to control the start and stop of each workstation individually, and impossible to view the real-time pressure, remaining pressure holding time, and test results of each workstation in real time; there are no standardized light prompts for equipment standby and operating status, making it impossible for on-site personnel to intuitively judge the equipment's operating condition. Fourth, the IO point allocation is chaotic, and the control system has low integration: traditional control circuit wiring is cumbersome, there is no standardized IO allocation scheme, making fault diagnosis difficult, and subsequent equipment maintenance and program repair difficult.

[0004] In addition, the existing underfloor heating pipe pressure testing fixtures have a rudimentary structural design and insufficient stability in clamping and centering the pipes. They typically use only a single external clamp or simple plug-in fixing method to fix the pipe ends, lacking a compression structure that can adapt to different pipe diameters. During the pipe connection process, eccentricity, offset, and poor sealing are likely to occur, which in turn leads to air leakage at the port during the pressure test, causing pressure fluctuations and significantly increasing the probability of misjudgment in the test.

[0005] Therefore, there is an urgent need for a multi-station independent pressure testing and holding control system for underfloor heating pipes to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the background art and provide a multi-station independent pressure testing and pressure holding detection control system for underfloor heating pipes.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A multi-station independent pressure testing and pressure holding detection control system for underfloor heating pipes includes: Pressure testing device: It has multiple pressure testing stations for fixing and installing the underfloor heating pipes to be tested and for conducting sealing tests; Interactive operation unit: includes parameter configuration interface and working condition display interface. The parameter configuration interface is used to customize the pressure reference pressure, pressure holding time and pressure deviation judgment threshold of each pressure test station. The working condition display interface is used to display the real-time pressure, pressure holding progress and test judgment results of each pressure test station. Pressure acquisition unit: includes pressure sensors installed at each of the pressure test stations, used to acquire pressure signals inside the floor heating pipes at the corresponding pressure test stations in real time, and to perform filtering, noise reduction and range calibration processing on the original pressure signals; Branch execution unit: includes independent intake control valve and exhaust control valve installed at each of the pressure test stations, used to independently control the intake and exhaust operations of each of the pressure test stations, and the pressurization, pressure holding, testing and pressure relief processes of each of the pressure test stations are isolated from each other and do not interfere with each other; The detection and judgment unit includes a controller. The controller allocates standardized IO address blocks to each of the pressure testing stations according to preset rules. The pressure acquisition signals, air intake control valve control signals, and exhaust control valve control signals of each of the pressure testing stations are centrally mapped to the corresponding IO address blocks. When the pressure of the underfloor heating pipe at the pressure testing station is detected to reach a set value, the controller automatically closes the air intake control valve of the corresponding pressure testing station and starts the pressure holding timer. After the pressure holding timer ends, the controller automatically determines the sealing status of the underfloor heating pipe at each pressure testing station based on the difference between the real-time pressure and the pressure benchmark pressure, and drives the exhaust control valve of the corresponding pressure testing station to release pressure and reset.

[0008] Preferably, the detection and judgment unit is further configured to generate a pressure failure alarm when any of the pressure testing stations fails to raise the pressure of the underfloor heating pipe to the reference pressure within the preset pressure testing time limit; during the automatic air intake and pressurization stage, the controller continuously compares the real-time pressure with the pressure testing reference pressure. If the pressure reaches the reference value within the pressure testing time limit, it normally enters the automatic valve closing and pressure holding stage. If the pressure test time limit expires and the pressure still does not reach the standard, it is determined that the pressure testing station has failed to raise the pressure, and a pressure failure alarm signal is generated. The signal is output through pop-up prompts on the human-machine interface, audible and visual alarms, or abnormal flashing of indicator lights, etc., to remind operators to check the problems existing in the pressure testing station in a timely manner, avoid the system from running idle for a long time under abnormal operating conditions, and improve detection efficiency and equipment safety.

[0009] Preferably, it also includes a data management unit for associating and storing the test pressure data of each test pressure station with the corresponding identification information of the underfloor heating pipe to support quality traceability query; by establishing a one-to-one correspondence between test pressure data and pipe label codes, a complete quality traceability file is formed. When pipe sealing problems occur at the project site or user end later, the original test pressure records can be quickly retrieved for comparison and verification, clarifying the quality responsibility links and supporting the needs of production quality control and after-sales traceability.

[0010] Preferably, it also includes a safety interlock unit, which is used to automatically open the exhaust control valve for emergency pressure relief when the system is in pressurization and / or pressure holding conditions and the safety protection door is detected to be open. The safety protection door (not shown in the figure) is a physical isolation barrier for the pressure testing device. When the system detects that any station is pressurizing or in the pressure holding stage, if the safety protection door is open, the emergency pressure relief logic is immediately triggered, and the exhaust control valve of the corresponding station is automatically opened for rapid pressure relief, so as to discharge the high-pressure gas in the pipeline to a safe state. This prevents the operator from accidentally opening the protection door under high-pressure conditions, which could lead to high-pressure gas spraying out and injuring people or pipeline rupture and splashing, and significantly improves the safety level of high-pressure testing operations.

[0011] Preferably, the pressure testing device includes a frame, a main pressure supply pipe, a main pressure relief pipe, station branch pipes, and an internal support centering mechanism. The station branch pipes correspond to the pressure testing stations. The main pressure supply pipe and the main pressure relief pipe are both fixedly installed at the bottom of the frame. Multiple station branch pipes are fixedly installed on the frame. The bottom end of each station branch pipe is simultaneously connected to both the main pressure supply pipe and the main pressure relief pipe. Each station branch pipe has an outwardly extending pipe interface fixedly installed at its top. The internal support centering mechanism is fixedly installed at the end of the pipe interface. Each pressure sensor is installed on its corresponding station branch pipe. Each air intake control valve is installed at the connection point between each station branch pipe and the main pressure supply pipe. Each exhaust control valve is installed at the connection point between each station branch pipe and the main pressure relief pipe. The device operates via a main pipe-branch pipe connection. The layered piping design, coupled with independent valve control, ensures that each pressure testing station forms a physically isolated testing loop, preventing cross-contamination and interference. Traditional underfloor heating pipe installation involves inserting the pipe end into the pipe interface and then tightening it with an external clamping mechanism. The tightness depends on the fit between the inner diameter of the underfloor heating pipe and the outer diameter of the pipe interface, as well as the fit between the outer diameter of the underfloor heating pipe and the inner diameter of the clamping mechanism. When the inner diameter of the underfloor heating pipe is too large, forcibly using a pipe interface with a fixed outer diameter not only fails to guarantee airtightness but also damages the pipe body. During transportation and storage, the pipe ends are also prone to becoming out of round due to external forces, making it easy to damage the pipe body when inserted into the pipe interface. The internal support and centering mechanism tightens and centers the underfloor heating pipe from the inside, flexibly adapting to different specifications of underfloor heating pipes, and ensuring the roundness of the pipe ends through internal support, thus improving airtightness.

[0012] Preferably, the internal support centering mechanism includes an internal support mounting base, an internal support claw, and a variable diameter centering assembly. The internal support claw includes a support plate. The internal support mounting base is fixedly disposed at the end of the pipe interface. The support plate is mounted on the internal support mounting base via the variable diameter centering assembly. The support plate extends outward from the internal support mounting base. Each support plate has a connecting step extending circumferentially on both sides. The connecting steps of two adjacent support plates interlock, and the outer contour formed by the support plates is circular. The support plate is mounted on the internal support mounting base via the variable diameter centering assembly. The support plate extends outward or retracts inward along the radial direction, and its outer wall fits against the inner wall of the underfloor heating pipe, thus tightening the pipe end from the inside, restricting the circumferential movement of the pipe, improving clamping stability, and achieving stable clamping of underfloor heating pipes of different diameters. When the variable diameter centering component drives the support plate to extend outward in the radial direction, the connecting steps always interlock to fill the circumferential gap between adjacent support plates, so that the outer contour formed by the multiple support plates remains a continuous circle when in the open state, ensuring the airtightness between the outer wall of the support plate and the inner wall of the underfloor heating pipe.

[0013] Preferably, the inner support centering mechanism further includes a limiting plate, which is fixedly disposed on the inner wall of the inner support mounting base near the pipe interface. The limiting plate has a radially extending inner support guide groove. The variable diameter centering assembly includes a drive gear, a driven gear, and a variable diameter motor. The variable diameter motor is fixedly disposed on the inner support mounting base and located on the inner side. The drive gear and the driven gear are both rotatably disposed within the inner support mounting base and mesh with each other. The drive gear and the output shaft of the variable diameter motor are connected for transmission. The driven gear is located on the outer side of the limiting plate and has multiple through-grooves. Each inner support claw also includes... The system includes an inner support slide and a transmission guide pin. Each inner support slide is slidably disposed within a corresponding inner support guide groove. The transmission guide pin is fixedly disposed on the inner support slide and extends outward. Each transmission guide pin slides within a corresponding transmission arc groove. The variable diameter motor drives the drive gear to rotate, which in turn drives the driven gear to rotate. The transmission arc groove on the driven gear pushes the inner support slide to move radially along the inner support guide groove through the transmission guide pin, thereby driving the support plate to achieve radial extension and retraction. The variable diameter centering assembly allows the operator to achieve self-centering of the underfloor heating pipe without precisely aligning it with the pipe interface, through the radial movement of the support plate.

[0014] Preferably, the pressure testing device further includes an external clamping mechanism, which includes an external clamping mounting base, external clamping claws, and a variable-pitch centering assembly. The external clamping mounting base is fixed on the inner support mounting base and located on the outside. The external clamping claws are mounted on the external clamping mounting base via the variable-pitch centering assembly. The external clamping claws are symmetrically arranged on both sides of the support plate, with one side of the two external clamping claws having a V-shaped structure. The external clamping claws are symmetrically arranged on both sides of the support plate via the variable-pitch centering assembly. When the inner support centering mechanism clamps the pipe from inside the underfloor heating pipe, the variable-pitch centering assembly drives the two external clamping claws to move towards each other. The V-shaped clamping surface clamps the outer wall of the underfloor heating pipe from the outside, forming a double clamping structure with the support plate. This effectively prevents the pipe from axially shifting or radially deviating during high-pressure testing, improving the reliability of the port seal.

[0015] Preferably, the pitch-adjusting assembly includes an outer clamping slide, a drive wedge, and a pitch-adjusting cylinder. The inner wall of the outer clamping mounting base has a horizontally extending outer clamping guide groove. Both outer clamping slides are slidably disposed within the outer clamping guide groove and are respectively fixedly connected to the outer clamping claw. The opposite sides of the two outer clamping slides are both inclined surfaces. The pitch-adjusting cylinder is fixedly mounted on the inner support mounting base. The telescopic end of the pitch-adjusting cylinder extends vertically. The drive wedge is fixedly mounted on the output shaft of the pitch-adjusting cylinder and is located between the two outer clamping slides. The drive wedge has two sides... The inclined surfaces of the two outer retaining slides respectively abut against each other and slide in cooperation. The outer retaining clamping mechanism also includes a tension spring, the two ends of which are fixedly connected to the opposite sides of the two connecting rods respectively. When the variable pitch cylinder extends, the driving wedge moves upward, and through the inclined surface cooperation, pushes the two outer retaining slides to slide outward synchronously along the outer retaining guide groove. When the variable pitch cylinder retracts, the driving wedge moves downward, and the tension spring pulls the two outer retaining slides to slide inward, so that the outer retaining claw is firmly clamped on the outer wall of the underfloor heating pipe, further improving the clamping stability of the underfloor heating pipe.

[0016] Preferably, the system further includes a clamping detection unit, which comprises an internal support force measuring module and an external clamping force measuring module. The internal support force measuring module is used to collect the tensioning force of the internal support centering mechanism on the underfloor heating pipe, and the external clamping force measuring module is used to collect the clamping force of the external clamping pressing mechanism on the underfloor heating pipe. The detection and judgment unit is also used to compare the two sets of force values ​​collected by the clamping detection unit. Only when the internal support tensioning force and the external clamping pressing force fall within the corresponding set range at the same time is it determined that the underfloor heating pipe is clamped in place, and the pressure testing process is started. The internal support force measuring module can be located between the support plate and the internal support slide, and the external clamping force measuring module can be located between the external clamping claw and the external clamping slide. The detection and judgment unit determines whether the underfloor heating pipe is clamped in place based on the two sets of force value signals, ensuring that the underfloor heating pipe can enter the high-pressure pressure testing stage only after both the internal and external clamping forces reach the qualified standard, avoiding port leakage, pressure fluctuations, and detection misjudgments caused by insecure clamping, and improving safety.

[0017] In summary, the present invention has the following beneficial effects: 1. The hardware and software of each pressure testing station in this invention are completely isolated. The pressure testing, pressure holding, testing and pressure release processes are isolated from each other and do not interfere with each other. Each station can be started and stopped, repaired and unloaded independently. The disassembly and installation of floor heating pipes or the shutdown due to failure of a single station will not affect the continuous operation of other stations, realizing the independent operation of each station, solving the drawbacks of the unified start and stop of the whole machine in traditional equipment, and improving equipment utilization and production and testing efficiency. 2. This invention features fully automatic execution of intake pressurization, automatic valve closure, timed pressure maintenance, pressure deviation judgment, and automatic exhaust. It eliminates the need for manual monitoring of valve opening and closing and pressure observation, reducing labor costs. At the same time, it avoids the safety hazards of gas leakage and pipeline rupture caused by human error, greatly improving operational safety. The standardized IO point allocation also reduces the difficulty of later maintenance. 3. The interactive operation unit of this invention allows operators to directly modify the pressure holding time and pressure error threshold in the parameter configuration interface without the need for professional electricians or programmers. It is suitable for use by front-line operators in the workshop and is also compatible with the testing of different specifications of underfloor heating pipes, improving the ease of operation and equipment versatility. The working status display interface displays the pressure data and test results of each workstation in real time, enabling operators to intuitively judge the equipment's operating status, making fault diagnosis and daily maintenance simple and quick. 4. The program of this invention has a small size, occupies little controller resources, does not require high-end PLC hardware, and has a low cost to build the entire control system, making it suitable for batch implementation by small and medium-sized underfloor heating manufacturers. 5. The internal support centering mechanism of this invention expands radially from the inside of the underfloor heating pipe, which can not only adapt to underfloor heating pipes of different specifications, but also correct pipe end deformation, avoiding pipe collapse and uneven sealing and leakage when the external clamping mechanism clamps alone; the external clamping mechanism clamps from the outer wall of the underfloor heating pipe inward, forming a bidirectional compression with the internal support clamping force, increasing the static friction of the pipe wall contact surface to resist the axial slippage force of the pipe caused by the pressurization air pressure; in conjunction with the clamping detection unit, the internal and external clamping forces are double-verified to accurately identify clamping failure faults, prevent misjudgment of test results, and improve the clamping sealing performance and equipment testing reliability under high pressure conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system framework of the present invention; Figure 2 This is a schematic diagram of the pressure testing device of the present invention; Figure 3 This is a schematic diagram of the internal support centering mechanism and the external clamping mechanism of the present invention; Figure 4 This is a schematic diagram of the internal support centering mechanism of the present invention; Figure 5 This is a schematic diagram of the inner support claw and limiting plate structure of the present invention; Figure 6 This is the present invention. Figure 5 An enlarged view of point A; Figure 7 This is a schematic diagram of the external clamping mechanism of the present invention; Figure 8 This is a schematic diagram of the external clamping mechanism of the present invention; In the diagram, 1. Pressure testing device; 10. Pressure testing station; 11. Frame; 12. Main pressure supply pipe; 13. Main pressure relief pipe; 14. Station branch pipe; 15. Pipe interface; 21. Interactive operation unit; 22. Pressure acquisition unit; 221. Pressure sensor; 23. Branch execution unit; 231. Inlet control valve; 232. Exhaust control valve; 24. Detection and judgment unit; 25. Data management unit; 26. Safety interlock unit; 27. Clamping detection unit; 3. Internal support centering mechanism; 31. Internal support mounting base; 32. 321. Inner support claw; 322. Support plate; 323. Connecting step; 324. Inner support slide; 325. Transmission guide pin; 336. Variable diameter centering assembly; 337. Drive gear; 338. Driven gear; 339. Variable diameter motor; 330. Arc groove; 34. Limiting plate; 351. Inner support guide groove; 46. Outer clamping mechanism; 41. Outer clamping mounting base; 411. Outer clamping guide groove; 42. Outer clamping claw; 43. Variable pitch centering assembly; 431. Outer clamping slide; 432. Drive wedge; 433. Variable pitch cylinder; 44. Tensioning spring. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example

[0021] according to Figure 1 , Figure 2 As shown, a multi-station independent pressure testing and holding control system for underfloor heating pipes includes: Pressure testing device 1: It has multiple pressure testing stations 10, which are used to fix and install the underfloor heating pipes to be tested and to perform sealing tests; Interactive operation unit 21 includes a parameter configuration interface and a working condition display interface. The parameter configuration interface is used to customize the pressure reference pressure, pressure holding time and pressure deviation judgment threshold of each pressure test station 10. The working condition display interface is used to display the real-time pressure, pressure holding progress and test judgment results of each pressure test station 10. Pressure acquisition unit 22: includes pressure sensor 221 installed at each pressure test station 10, used to acquire pressure signal inside the floor heating pipe at the corresponding pressure test station 10 in real time, and to perform filtering, noise reduction and range calibration processing on the original pressure signal. Branch execution unit 23: includes independent air intake control valve 231 and air exhaust control valve 232 installed on each pressure test station 10, used to independently control the air intake and air exhaust operations of each pressure test station 10, and the pressure testing, pressure holding, testing and pressure relief processes of each pressure test station 10 are isolated from each other and do not interfere with each other; The detection and judgment unit 24 includes a controller. The controller allocates standardized IO address blocks to each pressure test station 10 according to preset rules. The pressure acquisition signals, air intake control valve 231 control signals, and exhaust control valve 232 control signals of each pressure test station 10 are centrally mapped to the corresponding IO address blocks. When the pressure of the underfloor heating pipe at the pressure test station 10 is detected to reach the set value, the controller automatically closes the air intake control valve 231 of the corresponding pressure test station 10 and starts the pressure holding timer. After the pressure holding timer ends, the controller automatically determines the sealing status of the underfloor heating pipe at each pressure test station 10 based on the difference between the real-time pressure and the pressure reference pressure, and drives the exhaust control valve 232 of the corresponding pressure test station 10 to release pressure and reset.

[0022] according to Figure 1 As shown, the detection and judgment unit 24 is also used to generate a pressure failure alarm when any pressure test station 10 fails to raise the pressure of the underfloor heating pipe to the reference pressure within the preset pressure test time limit.

[0023] according to Figure 1 As shown, it also includes a data management unit 25, which is used to associate and store the test data of each test station 10 with the identification information of the corresponding underfloor heating pipe to support quality traceability query.

[0024] according to Figure 1As shown, it also includes a safety interlock unit 26, which is used to automatically open the exhaust control valve 232 for emergency pressure relief when the safety protection door is detected to be open when the system is in pressurization and / or pressure holding conditions.

[0025] according to Figure 2 As shown, the pressure testing device 1 includes a frame 11, a pressure supply main pipe 12, a pressure relief main pipe 13, station branch pipes 14, and an internal support centering mechanism 3. The station branch pipes 14 correspond to the pressure testing stations 10. The pressure supply main pipe 12 and the pressure relief main pipe 13 are both fixedly installed at the bottom of the frame 11. Multiple station branch pipes 14 are fixedly installed on the frame 11. The bottom end of each station branch pipe 14 is simultaneously connected to the pressure supply main pipe 12 and the pressure relief main pipe 13. The top end of each station branch pipe 14 is fixedly provided with an outwardly extending pipe interface 15. The internal support centering mechanism 3 is fixedly installed at the end of the pipe interface 15. Each pressure sensor 221 is respectively installed on the corresponding station branch pipe 14. Each air intake control valve 231 is respectively installed at the connection between each station branch pipe 14 and the pressure supply main pipe 12. Each exhaust control valve 232 is respectively installed at the connection between each station branch pipe 14 and the pressure relief main pipe 13.

[0026] according to Figures 3-6 As shown, the inner support centering mechanism 3 includes an inner support mounting base 31, an inner support claw 32, and a diameter-changing centering assembly 33. The inner support claw 32 includes a support plate 321. The inner support mounting base 31 is fixedly mounted on the end of the pipe interface 15. The support plate 321 is mounted on the inner support mounting base 31 through the diameter-changing centering assembly 33. The support plate 321 extends outward from the inner support mounting base 31. Each support plate 321 has a connecting step 322 extending circumferentially on both sides. The connecting steps 322 of two adjacent support plates 321 fit together. The outer contour formed by the support plates 321 is circular.

[0027] according to Figure 4 , Figure 5 As shown, the inner support centering mechanism 3 also includes a limiting plate 34, which is fixedly mounted on the inner wall of the inner support mounting base 31 near the pipe interface 15. The limiting plate 34 has a radially extending inner support guide groove 341. The variable diameter centering assembly 33 includes a drive gear 331, a driven gear 332, and a variable diameter motor 333. The variable diameter motor 333 is fixedly mounted on the inner support mounting base 31 and located on the inner side. The drive gear 331 and the driven gear 332 are both rotatably mounted within the inner support mounting base 31 and mesh with each other, driving... The output shafts of gear 331 and variable diameter motor 333 are connected by a drive. The driven gear 332 is located outside the limiting plate 34. Multiple drive arc grooves 334 are provided through the driven gear 332. The inner support claws 32 also include inner support slides 323 and drive guide pins 324. Each inner support slide 323 is slidably disposed in the corresponding inner support guide groove 341. The drive guide pins 324 are fixedly disposed on the inner support slides 323 and extend outward. Each drive guide pin 324 slides in the corresponding drive arc groove 334.

[0028] according to Figure 7 As shown, the pressure testing device 1 also includes an external clamping mechanism 4. The external clamping mechanism 4 includes an external clamping mounting base 41, an external clamping claw 42, and a variable pitch centering component 43. The external clamping mounting base 41 is fixedly mounted on the inner support mounting base 31 and located on the outer side. The external clamping claw 42 is mounted on the external clamping mounting base 41 through the variable pitch centering component 43. The external clamping claws 42 are symmetrically arranged on both sides of the support plate 321, and the opposite side of the two external clamping claws 42 has a V-shaped structure.

[0029] according to Figure 7 , Figure 8 As shown, the variable pitch centering assembly 43 includes an outer clamping slide 431, a drive wedge 432, and a variable pitch cylinder 433. The inner wall of the outer clamping mounting base 41 is provided with an outer clamping guide groove 411 extending in the horizontal direction. Both outer clamping slides 431 are slidably disposed in the outer clamping guide groove 411 and are respectively fixedly connected to the outer clamping claw 42. The opposite sides of the two outer clamping slides 431 are both inclined structures. The variable pitch cylinder 433 is fixedly disposed on the inner support mounting base 31. The telescopic end of the variable pitch cylinder 433 extends in the vertical direction. The drive wedge 432 is fixedly disposed on the output shaft of the variable pitch cylinder 433. The drive wedge 432 is located between the two outer clamping slides 431. The two sides of the drive wedge 432 abut against and slide with the inclined surfaces of the two outer clamping slides 431 respectively. The outer clamping pressing mechanism 4 also includes a tension spring 44. The two ends of the tension spring 44 are respectively fixedly connected to the opposite sides of the two connecting rods 422.

[0030] according to Figure 1 As shown, it also includes a clamping detection unit 27, which includes an internal support force measuring module and an external clamping force measuring module. The internal support force measuring module is used to collect the tensioning force of the internal support centering mechanism 3 on the underfloor heating pipe, and the external clamping force measuring module is used to collect the clamping force of the external clamping pressing mechanism 4 on the underfloor heating pipe. The detection and judgment unit 24 is also used to compare the two sets of force values ​​collected by the clamping detection unit 27. Only when the internal support tensioning force and the external clamping pressing force fall within the corresponding set range at the same time, it is determined that the underfloor heating pipe is clamped in place and the pressure test process is started.

[0031] The pressure testing device 1 has 5 pressure testing stations 10; The interactive operation unit 21 adopts an MCGS configuration touch screen, which integrates independent start / stop buttons for 5 pressure testing stations 10, pressure parameter setting window, pressure holding time setting window, pressure deviation threshold setting window, real-time pressure value display for each station, station test result (qualified / unqualified) display, and full system operation status monitoring function. The core controller of the detection and judgment unit 24 adopts Siemens S7-200SMART PLC, which includes six functional blocks: analog quantity standardization conversion subroutine, single-station independent control subroutine, pressure closed-loop judgment subroutine, pressure holding timer subroutine, pressure deviation judgment subroutine, and light status control subroutine. The system's I / O points are configured as follows: a total of 8 AI analog input channels, used to acquire real-time raw analog pressure signals from 5 workstations, complete analog-to-digital conversion, and upload pressure data in real time; a total of 3 DI digital input channels, used to receive on-site emergency stop, external reset, and system start safety signals to ensure safe equipment operation; and a total of 12 DO digital output channels, which respectively control the 5 workstations' independent intake control valves 231, the 5 workstations' independent exhaust control valves 232, and the system's operating status indicator lights. Pressure sensor 221 collects the raw analog signal of gas pressure on site and transmits it to the 8 analog input ports of PLC. The PLC internal program completes analog-to-digital conversion, range calibration and data filtering to eliminate electromagnetic interference under high pressure conditions on site and accurately convert the raw electrical signal into the actual pressure value, ensuring the accuracy of pressure acquisition and providing accurate data support for subsequent automatic pressure control. The total program size of the entire PLC control program is 3741 bytes. The program structure is concise, the running response speed is fast, and it is suitable for harsh high-voltage working conditions in industrial sites.

[0032] System control flow: S1. Parameter preset stage: The operator sets the system parameters in advance on the MCGS touch screen: the standard pressure reference pressure is set to 17MPa, the pressure holding time is set to 60s, the pressure deviation judgment threshold is set to ±0.3MPa, and the parameters are sent to the controller for storage with one click. S2. Independent start of a single workstation: The operator clicks the start button of any test workstation 10 on the touch screen, and the other test workstations 10 remain unchanged in their original working state, so that each test workstation 10 can operate completely independently without affecting each other. S3. Automatic air intake and pressurization stage: After the pressure test station 10 is started, the PLC program automatically controls the air intake control valve 231 of the pressure test station 10 to open, and high-pressure gas enters the inside of the floor heating pipe. The system collects the internal pressure of the pipe in real time and continuously monitors it. S4. Automatic valve closing and pressure holding stage: When the controller detects that the real-time pressure of the pipeline reaches the preset standard pressure value of 17MPa, the program immediately closes the loop and automatically shuts off the air intake control valve 231 of the pressure test station 10, stops the air intake, and the system enters the countdown pressure holding mode, and starts the pressure holding time according to the preset time. S5, Pressure holding completion pressure deviation judgment stage: After the pressure holding countdown ends, the controller automatically compares the current real-time pressure of the pipeline with the standard 17MPa pressure value; if the real-time pressure deviation is within ±0.3MPa, the underfloor heating pipe is judged to be qualified for sealing; if the real-time pressure is higher than 17.3MPa or lower than 16.7MPa, the underfloor heating pipe is judged to be unqualified for sealing. S6. Automatic exhaust and reset stage: After the test result is generated, the controller automatically opens the exhaust control valve 232 of the corresponding pressure test station 10 to complete the pipeline depressurization. After the depressurization is completed, the exhaust control valve 232 is closed, and the pressure test station 10 is automatically reset and waits for the next test command. Working principle: According to Figures 1 to 7 As shown, the variable-pitch cylinder 433 of the outer clamping mechanism 4 drives the drive wedge 432 to move upward, pushing the outer clamping slide 431 to move in opposite directions along the outer clamping guide groove 411, causing the outer clamping claw 42 to open, waiting for the installation of the underfloor heating pipe to be tested; the end of the underfloor heating pipe to be tested is placed outside the support plate 321 of the inner support centering mechanism 3 until the end of the underfloor heating pipe is flush with the outer end face of the limit plate 34, the variable-diameter motor 333 drives the drive gear 331 to rotate, causing the driven gear 332 to rotate. The transmission arc groove 334 on the driven gear 332 drives the inner support slide 323 to slide outward along the inner support guide groove 341 through the transmission guide pin 324, which drives the support plate 321 to open until the outer wall of the support plate 321 and the inner wall of the floor heating pipe are in contact, thus completing the inner support clamping of the floor heating pipe; the variable pitch cylinder 433 drives the drive wedge block 432 to reset downward, and the tension spring 44 drives the outer gripper 42 to move towards each other until it abuts against the outer wall of the floor heating pipe, thus completing the outer gripping clamping of the floor heating pipe.

[0033] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A multi-station independent pressure testing and holding control system for underfloor heating pipes, characterized in that, include: Pressure testing device (1): It has multiple pressure testing stations (10) for fixing and installing the floor heating pipe to be tested and for conducting a sealing test; Interactive operation unit (21): includes parameter configuration interface and working condition display interface. The parameter configuration interface is used to customize the pressure reference pressure, pressure holding time and pressure deviation judgment threshold of each of the pressure testing stations (10). The working condition display interface is used to display the real-time pressure, pressure holding progress and detection judgment result of each of the pressure testing stations (10). Pressure acquisition unit (22): includes pressure sensor (221) installed at each of the pressure test stations (10), used to acquire pressure signals inside the floor heating pipes at the corresponding pressure test stations (10) in real time, and to perform filtering, noise reduction and range calibration processing on the original pressure signals; Branch execution unit (23): includes independent intake control valve (231) and exhaust control valve (232) installed on each of the pressure test stations (10), used to independently control the intake and exhaust operations of each of the pressure test stations (10), and the pressurization, pressure holding, detection and pressure relief processes of each of the pressure test stations (10) are isolated from each other and do not interfere with each other; The detection and judgment unit (24) includes a controller. The controller allocates standardized IO address blocks to each of the pressure test stations (10) according to preset rules. The pressure acquisition signal, air intake control valve (231) control signal and exhaust control valve (232) control signal of each of the pressure test stations (10) are centrally mapped to the corresponding IO address blocks. When the pressure of the underfloor heating pipe on the pressure test station (10) is detected to reach the set value, the air intake control valve (231) of the corresponding pressure test station (10) is automatically closed and the pressure holding timer is started. After the pressure holding timer ends, the sealing status of the underfloor heating pipe on each of the pressure test stations (10) is automatically determined according to the difference between the real-time pressure and the pressure reference pressure, and the exhaust control valve (232) of the corresponding pressure test station (10) is driven to release pressure and reset.

2. The multi-station independent pressure testing and holding control system for underfloor heating pipes according to claim 1, characterized in that, The detection and judgment unit (24) is also used to generate a pressure failure alarm when any of the pressure test stations (10) fails to raise the pressure of the underfloor heating pipe to the reference pressure within the preset pressure test time limit.

3. The multi-station independent pressure testing and holding control system for underfloor heating pipes according to claim 1, characterized in that, It also includes a data management unit (25) for associating and storing the test data of each of the test stations (10) with the identification information of the corresponding underfloor heating pipes to support quality traceability query.

4. The multi-station independent pressure testing and holding control system for underfloor heating pipes according to claim 1, characterized in that, It also includes a safety interlock unit (26), which automatically opens the exhaust control valve (232) for emergency pressure relief when the system is in a pressurization and / or pressure holding condition and the safety protection door is detected to be open.

5. The multi-station independent pressure testing and holding control system for underfloor heating pipes according to claim 1, characterized in that, The pressure testing device (1) includes a frame (11), a main pressure supply pipe (12), a main pressure relief pipe (13), station branch pipes (14), and an internal support centering mechanism (3). The station branch pipes (14) correspond to the pressure testing stations (10). The main pressure supply pipe (12) and the main pressure relief pipe (13) are both fixedly installed at the bottom of the frame (11). Multiple station branch pipes (14) are fixedly installed on the frame (11). The bottom end of each station branch pipe (14) is simultaneously connected to the main pressure supply pipe (12) and the main pressure relief pipe (13). Each of the workstation branch pipes (14) has an outwardly extending pipe interface (15) fixedly provided at its top end. The internal support centering mechanism (3) is fixedly provided at the end of the pipe interface (15). Each of the pressure sensors (221) is respectively provided on the corresponding workstation branch pipe (14). Each of the air intake control valves (231) is respectively provided at the connection between each of the workstation branch pipes (14) and the pressure supply main pipe (12). Each of the exhaust control valves (232) is respectively provided at the connection between each of the workstation branch pipes (14) and the pressure relief main pipe (13).

6. The multi-station independent pressure testing and holding detection control system for underfloor heating pipes according to claim 5, characterized in that, The inner support centering mechanism (3) includes an inner support mounting base (31), an inner support claw (32), and a diameter-changing centering assembly (33). The inner support claw (32) includes a support plate (321). The inner support mounting base (31) is fixedly mounted at the end of the pipe interface (15). The support plate (321) is mounted on the inner support mounting base (31) through the diameter-changing centering assembly (33). The support plate (321) extends outward from the inner support mounting base (31). Each support plate (321) has connecting steps (322) extending circumferentially on both sides. The connecting steps (322) of two adjacent support plates (321) are interlocked. The outer contour formed by the support plates (321) is circular.

7. The multi-station independent pressure testing and holding detection control system for underfloor heating pipes according to claim 6, characterized in that, The inner support centering mechanism (3) also includes a limiting plate (34), which is fixedly mounted on the inner wall of the inner support mounting base (31) near the pipe interface (15). The limiting plate (34) has an inner support guide groove (341) extending radially. The variable diameter centering assembly (33) includes a drive gear (331), a driven gear (332), and a variable diameter motor (333). The variable diameter motor (333) is fixedly mounted on the inner support mounting base (31) and located on the inner side. The drive gear (331) and the driven gear (332) are both rotatably mounted in the inner support mounting base (31) and mesh with each other. The wheel (331) and the output shaft of the variable diameter motor (333) are connected by a transmission. The driven gear (332) is located outside the limiting plate (34). The driven gear (332) has multiple transmission arc grooves (334) through it. The inner support claw (32) also includes an inner support slide (323) and a transmission guide pin (324). Each inner support slide (323) is slidably disposed in the corresponding inner support guide groove (341). The transmission guide pin (324) is fixedly disposed on the inner support slide (323) and extends outward. Each transmission guide pin (324) slides in the corresponding transmission arc groove (334).

8. A multi-station independent pressure testing and holding detection control system for underfloor heating pipes according to claim 6, characterized in that, The pressure testing device (1) also includes an external clamping mechanism (4), which includes an external clamping mounting base (41), an external clamping claw (42), and a variable pitch centering assembly (43). The external clamping mounting base (41) is fixed on the inner support mounting base (31) and located on the outside. The external clamping claw (42) is mounted on the external clamping mounting base (41) through the variable pitch centering assembly (43). The external clamping claws (42) are symmetrically arranged on both sides of the support plate (321), and the opposite side of the two external clamping claws (42) has a V-shaped structure.

9. A multi-station independent pressure testing and holding detection control system for underfloor heating pipes according to claim 8, characterized in that, The pitch-adjusting assembly (43) includes an outer clamping slide (431), a drive wedge (432), and a pitch-adjusting cylinder (433). The inner wall of the outer clamping mounting base (41) has a horizontally extending outer clamping guide groove (411). Both outer clamping slides (431) are slidably disposed within the outer clamping guide groove (411) and fixedly connected to the outer clamping claw (42). The opposite sides of the two outer clamping slides (431) are inclined planes. The pitch-adjusting cylinder (433) is fixedly mounted on the inner support mounting base (31). The telescopic end of the cylinder (433) extends vertically. The drive wedge (432) is fixed on the output shaft of the variable pitch cylinder (433). The drive wedge (432) is located between the two outer sliding blocks (431). The two sides of the drive wedge (432) abut against and slide with the inclined surfaces of the two outer sliding blocks (431). The outer clamping mechanism (4) also includes a tension spring (44). The two ends of the tension spring (44) are fixedly connected to the opposite side of the two connecting rods (422).

10. A multi-station independent pressure testing and holding detection control system for underfloor heating pipes according to claim 8, characterized in that, It also includes a clamping detection unit (27), which includes an internal support force measuring module and an external clamping force measuring module. The internal support force measuring module is used to collect the tensioning force of the internal support centering mechanism (3) on the floor heating pipe, and the external clamping force measuring module is used to collect the clamping force of the external clamping pressing mechanism (4) on the floor heating pipe. The detection judgment unit (24) is also used to compare the two sets of force values ​​collected by the clamping detection unit (27). Only when the internal support tensioning force and the external clamping pressing force fall within the corresponding set range at the same time, it is determined that the floor heating pipe is clamped in place and the pressure test process is started.

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