Elbow angle detection device and detection method thereof

Abstract

The bent pipe angle detection device is applied to the technical field of pipe fitting machining and comprises a carrying assembly and a control system, the carrying assembly comprises a mounting plate, a protective shell is fixedly mounted on one side of the mounting plate, a light barrier is arranged in front of the carrying assembly, and two sets of connecting rods are symmetrically arranged between the light barrier and the mounting plate; the output end of the connecting rod is hinged to the light barrier, the lower end of the connecting rod is hinged to a sliding seat, the sliding seat is slidably connected with the front end of the mounting plate, a fixing rod is arranged in front of the light barrier, the light barrier is slidably connected with the fixing rod, a base is fixedly mounted at the upper end of the mounting plate, a rotating seat is fixedly mounted at the upper end of the base, and a belt wheel is arranged at the rear end of the rotating seat. A mounting shaft of the belt wheel penetrates through the rotating seat and is connected with a rotating seat bearing, the central position of the belt wheel is in threaded connection with a pipe joint, a second motor is arranged below the belt wheel, and the output end of the second motor is connected with the belt wheel through a synchronous belt.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting processing technology, specifically to a pipe bending angle detection device and its detection method. Background Technology

[0002] Pipe bends are pipe fittings that bend straight pipes into a certain angle and shape using a specific process. They are extremely common and important pipe components in modern industry, enabling pipe systems to bypass obstacles, adapt to equipment layouts, or change the direction of fluid transport.

[0003] Angle inspection of pipe bends is a crucial step in the pipe bending and installation process, ensuring that the processed bends are completely consistent with the design requirements and guaranteeing the precise assembly of the piping system. Under current technology, traditional pipe bending inspection techniques rely heavily on the operator's experience, eyesight, and technique. Different measurers may obtain different results. Precise inspection using third-party instruments often requires sending the bends to a dedicated inspection area, making it impossible to achieve real-time feedback and adjustments on the processing site, thus affecting production efficiency.

[0004] Therefore, how to achieve efficient and accurate pipe bending angle detection has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a pipe bending angle detection device and its detection method to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pipe bending angle detection device, comprising a machine tool, a loading assembly, and a control system. The loading assembly includes a mounting plate, which is fixedly mounted on the upper end of the machine tool. A protective shell is fixedly mounted on one side of the mounting plate. A light-blocking plate is provided in front of the loading assembly. Two sets of connecting rods are symmetrically arranged between the light-blocking plate and the mounting plate. The output end of the connecting rod is hinged to the light-blocking plate. A sliding seat is hinged to the lower end of the connecting rod. The sliding seat is slidably connected to the front end of the mounting plate. A fixing rod is provided in front of the light-blocking plate. The lower end of the fixed rod is fixedly connected to the machine tool, the light-blocking plate is slidably connected to the fixed rod, a base is fixedly installed on the upper end of the mounting plate, a rotating seat is fixedly installed on the upper end of the base, a pulley is provided at the rear end of the rotating seat, the mounting shaft of the pulley passes through the rotating seat and is connected to the bearing of the rotating seat, a circular through hole is opened at the center of the pulley, a pipe joint is threaded inside the circular through hole, a second motor is provided below the pulley, the second motor is fixedly installed on the upper end of the machine tool and located inside the protective shell, and the output end of the second motor is connected to the pulley through a synchronous belt.

[0007] According to the above technical solution, a frame is installed on the upper rear side of the machine tool, a linear motor is installed on the front end of the frame, a slide table is slidably connected to the upper end of the linear motor, the slide table is installed perpendicular to the linear motor, a motor is installed on the upper end of the slide table, a lead screw is provided inside the slide table, the output end of the motor passes through the slide table and is fixedly connected to one end of the lead screw, the other end of the lead screw is connected to the slide table bearing, a sliding plate is connected to the front end of the slide table with a nut, a scanning device is installed at the front end of the sliding plate, the scanning head of the scanning device faces downward, drag chains are installed on the front end of the frame and the side wall of the slide table, a fill light plate is provided above the loading assembly, the fill light plate is hinged to the front end of the frame by a hinge, a scanning window is opened at the upper end of the fill light plate, the scanning device is located directly above the scanning window, and several lamps are evenly installed at the lower end of the fill light plate.

[0008] A method for detecting the angle of a pipe bend, using the aforementioned pipe bend angle detection device, includes the following method: S1: Securely mount the independent bend to be tested onto the load assembly; S2: Use the scanning device to scan the independent bent pipe to be tested, compare it with the preset processing parameters of the bent pipe, and determine whether the bending pipe processing is qualified. S3: Detect the actual spatial position and orientation of the bend, and splice the multiple qualified bends from S2 into a long bend. Repeat the installation operation of S1 and the detection operation of S2 to check whether there are errors caused by the accumulation of tolerances in the multiple bends. S4: Feeds back the actual data of pipe bending in S2 and S3 to the processing stage, providing real and reliable reference data for optimizing the pipe bending production process.

[0009] A detection method for a pipe bending angle detection device, wherein step S1 includes the following method: S1.1: The staff uses the pipe joint to fix and install the bent pipe to be tested, adjusts the light-blocking position of the light-blocking plate to reduce the influence of external light sources, and the motor drives the bent pipe to be tested to rotate.

[0010] A detection method for a pipe bending angle detection device, wherein step S2 includes the following method: S2.1: The control system powers on the lamp tube at the lower end of the fill light plate so that the light illuminates the curved tube, reducing the impact of the curved tube's shadow on the detection results; S2.2: The control system controls the scanning device to scan the bend once after each rotation of the control tube; S2.3: The scanning device transfers the data of the outer contour of the bent pipe obtained in each scanning cycle to the analysis module. The analysis module summarizes and analyzes the data, and finally obtains the actual outer contour model of the bent pipe. The data of the model is compared and analyzed with the design data during the production and processing of the bent pipe to detect whether the bent pipe is qualified; S2.4: After the test of a single bending part is completed, a comparative test is carried out to exclude the error caused by the tolerance accumulation of multiple qualified bending parts.

[0011] A detection method for a bent pipe angle detection device. The S2.3 includes the following methods: The scanning device transfers all the outer shape data to the analysis module, and the analysis module summarizes it to obtain the actual outer contour model of the bent pipe. The model data is compared and analyzed with the processing preset data; Specifically, the actually measured bending angle is defined as X1, the angle tolerance is defined as ∆X1, and the designed angle is defined as D1; When D1 - ∆X1 ≤ X1 ≤ D1 + ∆X1, X1 meets the tolerance requirements and the actual bending angle is qualified; When X1 < D1 - ∆X1 or X1 > D1 + ∆X1, X1 exceeds the tolerance range and the actual bending angle is unqualified; The actually measured bending radius is defined as X2, and the detection principle is the same as that of the above-mentioned bending angle detection principle.

[0012] A detection method for a bent pipe angle detection device. The S2.4 includes the following methods: Detect the straight-line segment distance between every two adjacent bending parts. The distance between the two bending parts is defined as X3, and the detection principle of X3 is the same as that in S2.3. In the actual detection process, the operation order of S2.3 and S2.4 can be arbitrarily exchanged.

[0013] A detection method for a bent pipe angle detection device. The S3 includes the following methods: S3.1: Take the central axis of the rotating seat as the reference line. The analysis module uses the bent pipe model to analyze the error value between the real position and attitude of the bent pipe and the design value, and judges whether the actual spatial position and attitude of the bent pipe are qualified; S3.2: Assemble multiple qualified bent pipes, and repeat the operations of S1, S2.1 and S3.1. When it is detected that X4 is unqualified, the staff checks whether the connection part is reasonably connected. If there is a connection failure, it is adjusted in time. If the connection part meets the installation requirements, it means that the unqualified is caused by error accumulation. Then, the connection process and processing process should be optimized.

[0014] A detection method for a bent pipe angle detection device. The S3.1 includes the following methods: The error between the actual position and orientation and the design value is defined as X4, and the tolerance is defined as D4. Ideally, X4 equals 0. If X4≤D4, it means that the actual spatial position and orientation of the bend are qualified.

[0015] A detection method for a pipe bending angle detection device, wherein step S4 includes the following method: S4.1: If obvious deformation or cracks are found in the bend during the inspection process of S2 and S3, it indicates that the process parameters are not properly controlled during the bend processing. Processing should be stopped and optimized. After troubleshooting and design optimization, the inspection process of S2 and S3 should be repeated. After passing the inspection, the qualified bend can be transported to the subsequent processing stage. S4.2: The analysis module summarizes the test results of S2 and S3 and transmits them to the production and processing stage of the pipe bend, providing real and reliable reference data for optimizing the production process of the pipe bend.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention achieves stable connection of the bent tube under test by setting up a loading component, thereby improving the detection accuracy; by setting up a supplementary light plate and a light blocking plate, the influence of ambient light on the detection structure is further reduced; by setting up a control system, the model drawing of the bent tube under test is realized, providing reliable reference data for process optimization. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross slide mechanism of the present invention; Figure 3 This is a schematic diagram of the fill light plate structure of the present invention; Figure 4 This is a schematic diagram of the installation of the cargo carrier component of the present invention; Figure 5 This is a schematic diagram of the structure of the cargo carrier component of the present invention; Figure 6 This is a schematic diagram of the internal structure of the protective shell of the present invention; Figure 7 This is a schematic diagram of the rotating base installation of the present invention; Figure 8 This is a schematic diagram of the working state of the present invention; Figure 9 This is a schematic diagram of the second working state of the present invention; In the diagram: 1. Machine tool; 2. Frame; 3. Linear motor; 4. Slide table; 5. Motor 1; 6. Sliding plate; 7. Scanning device; 8. Light-filling plate; 9. Scanning window; 10. Protective shell; 11. Light-blocking plate; 12. Mounting plate; 13. Connecting rod; 14. Sliding seat; 15. Fixed rod; 16. Base; 17. Rotary seat; 18. Pulley; 19. Pipe joint; 20. Motor 2. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-2 This invention provides a technical solution: a pipe bending angle detection device, including a machine tool 1 and a control system. The control system receives signals from each actuator and issues command signals to each actuator. The control system includes an analysis module. A frame 2 is installed on the upper rear side of the machine tool 1. A linear motor 3 is installed on the front end of the frame 2. A slide table 4 is slidably connected to the upper end of the linear motor 3. The slide table 4 is installed perpendicular to the linear motor 3. A motor 5 is installed on the upper end of the slide table 4. A lead screw (not shown in the figure) is provided inside the slide table 4. The output end of the motor 5 passes through the slide table 4 and is fixedly connected to one end of the lead screw. The other end of the lead screw is connected to a bearing of the slide table 4. The slide table 4, the motor 5, and the lead screw constitute a lead screw transmission mechanism. A sliding plate 6 is provided at the front end of the slide table 4. The sliding plate 6 is connected to the lead screw by a nut. The lead screw transmission mechanism and the linear motor 3 constitute a cross slide table mechanism (e.g., Figure 2 As shown in the figure, the sliding plate 6 can move freely in the horizontal coordinate system. The working principle of the cross slide mechanism is existing technology and will not be described in detail here.

[0020] A scanning device 7 is installed at the front end of the sliding plate 6. The scanning head of the scanning device 7 faces downward. Cable chains are installed at the front end of the frame 2 and the side wall of the slide table 4 to integrate and install cables, thereby providing power to the cross slide table mechanism and the scanning device 7.

[0021] Please see Figure 1 and Figure 3 A fill light plate 8 is provided below the cross slide mechanism. The fill light plate 8 is hinged to the front end of the frame 2 through a hinge, so that the fill light plate 8 can rotate around the hinge. A scanning window 9 is provided at the upper end of the fill light plate 8. The scanning device 7 is located directly above the scanning window 9. Several lamp tubes (not shown in the figure) are evenly installed at the lower end of the fill light plate 8.

[0022] Please see Figures 4-6A loading assembly is installed on the upper end of the machine tool 1, located below the supplementary lighting plate 8. The loading assembly includes a mounting plate 12, which is fixedly installed on the upper end of the machine tool 1. A protective shell 10 is fixedly installed on one side of the mounting plate 12. A light-blocking plate 11 is provided in front of the loading assembly. Two sets of connecting rods 13 are symmetrically arranged between the light-blocking plate 11 and the mounting plate 12. The output end of the connecting rod 13 is hinged to the light-blocking plate 11. A sliding seat 14 is hinged to the lower end of the connecting rod 13. The sliding seat 14 is slidably connected to the front end of the mounting plate 12. A fixed rod 15 is provided in front of the light-blocking plate 11. The lower end of the fixed rod 15 is fixedly connected to the machine tool 1. The light-blocking plate 11 is slidably connected to the fixed rod 15. When the operator moves the sliding seat 14, the sliding seat 14 drives the connecting rod 13 to move, thereby causing the connecting rod 13 to move the light-blocking plate 11. The fixed rod 15 limits the light-blocking plate 11, allowing the light-blocking plate 11 to move in the vertical direction.

[0023] Please see Figure 7 and Figure 8 A base 16 is fixedly mounted on the upper end of the mounting plate 12, and a rotating seat 17 is fixedly mounted on the upper end of the base 16. A pulley 18 is provided at the rear end of the rotating seat 17. The mounting shaft of the pulley 18 passes through the rotating seat 17 and is connected to the bearing of the rotating seat 17. A circular through hole (not shown in the figure) is opened at the center of the pulley 18. A pipe joint 19 is threadedly connected inside the circular through hole. A second motor 20 is provided below the pulley 18. The second motor 20 is fixedly mounted on the upper end of the machine tool 1 and located inside the protective shell 10. The output end of the second motor 20 is connected to the pulley 18 through a synchronous belt.

[0024] A testing method for a pipe bending angle detection device includes the following steps: S1: The staff uses pipe fitting 19 to fasten one end of the independent bend to be tested to pulley 18. The working principle of pipe fitting 19 is based on existing technology to realize the installation of the bend.

[0025] S2: Use scanning device 7 to scan the independent bent pipe to be tested, use analysis module to collect the actual outer contour data of the bent pipe, compare it with the preset processing parameters of the bent pipe, and determine whether the bending pipe processing is qualified.

[0026] S3: Join the multiple qualified bends from S2 into a long bend, repeat the installation operation of S1, repeat the inspection operation of S2, and check whether there are errors caused by the accumulation of tolerances in the multiple bends.

[0027] S4: Feeds back the actual data of pipe bending in S2 and S3 to the processing stage, providing real and reliable reference data for optimizing the pipe bending production process.

[0028] A testing method for a pipe bending angle detection device, wherein step S1 includes the following method: S1.1: The operator rotates the fill light plate 8 upwards to expand the operating space above the loading assembly (e.g., ...). Figure 8 As shown), the staff further uses the pipe connector 19 to fasten one end of the bent pipe to the pulley 18. The staff moves the sliding seat 14 to make the light-blocking plate 11 move in the vertical direction. Under the premise of ensuring that the staff can observe the bent pipe, the light-blocking position of the light-blocking plate 11 is adjusted to reduce the influence of external light sources.

[0029] Furthermore, rotate the fill light plate 8 in the opposite direction to reset it (e.g., Figure 1 As shown), after the installation of the bent pipe is completed, the control system sends a periodic working signal to the second motor 20, causing the output end of the second motor 20 to rotate periodically. The rotation angle of the output end of the second motor 20 in a single rotation cycle is less than or equal to 90 degrees. The output end of the second motor 20 drives the pulley 18 to rotate through the synchronous belt. Since the pulley 18 is connected to the bearing of the rotating seat 17 and the pipe joint 19 is threadedly connected to the pulley 18, the pulley 18 drives the pipe joint 19 to rotate, and the pipe joint 19 drives the bent pipe that is fastened to rotate.

[0030] It should be noted that the supplementary light plate 8 and the protective shell 10 are used to block the scanning path of the scanning device 7, so as to avoid the analysis module from making misjudgments due to the complex structure of the other components.

[0031] Furthermore, staff can install blackout curtains (such as...) at the upper end of frame 2. Figure 9 As shown in the image, the entire device is surrounded to reduce the influence of external light sources.

[0032] A testing method for a pipe bending angle detection device, wherein step S2 includes the following method: S2.1: The control system powers on the lamp tubes at the lower end of the supplementary lighting plate 8, so that the light shines on the curved tube. Since multiple sets of lamp tubes are evenly installed, the influence of the curved tube shadow on the detection results is minimized through multi-angle uniform illumination.

[0033] S2.2: The control system controls the cross slide mechanism to drive the sliding plate 6 to move freely in the horizontal coordinate system. The sliding plate 6 drives the scanning device 7 to move synchronously, so that the scanning device 7 moves along the long side of the scanning window 9. The observation light of the scanning device 7 scans the curved tube in this process. The process of moving the scanning device 7 from one end of the scanning window 9 to the other end is defined as a scanning cycle. The control system controls the scanning device 7 to scan the curved tube once after each rotation of the curved tube. That is, the rotation cycle and the scanning cycle are alternated until the curved tube has rotated one full turn, and the scanning ends.

[0034] It should be noted that the rotation angle within a rotation period can be adjusted according to actual production requirements. Exemplarily, for bent pipes with high precision requirements such as automotive parts, the rotation angle can be adjusted to 30 degrees. That is, the bent pipe needs to go through 12 rotation periods to complete one full rotation, enabling the scanning device 7 to obtain more accurate outer contour data and improving the detection accuracy. For large-scale production, the rotation angle can be adjusted to 90 degrees, that is, the bent pipe only needs to go through 4 rotation periods to complete one full rotation, increasing the production rate.

[0035] S2.3: The scanning device 7 transmits the outer contour data of the bent pipe scanned within each group of scanning periods to the analysis module. Since the bent pipe rotates one full circle after going through multiple groups of rotation periods, the outer contour data of the bent pipe obtained within each group of scanning periods is the outer contour data of the bent pipe at different rotation angles. The analysis module aggregates and analyzes the outer contour data within multiple scanning periods, and finally obtains the actual outer contour model of the bent pipe. The data such as the bending angle and bending radius of the model are compared and analyzed with the design data during the production and processing of the bent pipe to detect whether the bent pipe is qualified.

[0036] Specifically, the measured actual bending angle is defined as X1, the angle tolerance is defined as ∆X1, and the design angle is defined as D1.

[0037] When D1 - ∆X1 ≤ X1 ≤ D1 + ∆X1, X1 meets the tolerance requirements and the actual bending angle is qualified.

[0038] When X1 < D1 - ∆X1 or X1 > D1 + ∆X1, X1 exceeds the tolerance range and the actual bending angle is unqualified.

[0039] The measured actual bending radius is defined as X2, and the detection principle is the same as that of the above-mentioned bending angle detection principle, which will not be elaborated here.

[0040] S2.4: In the prior art, there is no clear upper limit requirement for the bending part of a single bent pipe. However, considering production costs and processing difficulties, common single bent pipes usually have 3 to 5 bending parts. Therefore, the qualification of the accuracy of a single bending part does not mean the qualification of the overall accuracy of the bent pipe. It is necessary to detect the straight-line segment spacing between every two adjacent groups of bending parts, and the spacing between two groups of bending parts is defined as X3.

[0041] Exemplarily, X1 and X2 of any two adjacent bending parts are both qualified, but the left bending part shifts to the right and the right bending part shifts to the left, resulting in an overly small X3. In a multi-segment bent pipe structure, the unqualified X3 of any two adjacent bending parts will cause a chain reaction, resulting in insufficient assembly space or misalignment of subsequent bending parts, seriously affecting the overall accuracy of the bent pipe.

[0042] Furthermore, it is possible that any two sets of bending sections have a qualified X3, but the actual bending radius X2 of the first bending section is slightly smaller than the minimum tolerance range, and the spacing error of the second bending section is compensated by forward offset, which leads to structural damage due to stress concentration during long-term use of the bend and reduces the reliability of use.

[0043] The detection principle of X3 is the same as that of S2.3. It should be noted that in the actual detection process, the operation order of S2.3 and S2.4 can be arbitrarily interchanged without affecting the actual detection results.

[0044] A testing method for a pipe bending angle detection device, wherein step S3 includes the following method: S3.1: The inspection of a single bend was completed in S2. During the installation process, there is an alignment deviation between the actual spatial position and posture of the bend and the designed position and posture. Since the base 16 and the rotating seat 17 are fixed structures and their position information is known, the central axis of the rotating seat 17 is used as the reference line. The analysis module uses the bend model to analyze the error value between the actual position and posture of the bend and the design value, and judges whether the actual spatial position and posture of the bend are qualified. The error value between the actual position and posture and the design value is defined as X4, and the tolerance is defined as D4. Ideally, X4 is equal to 0. If X4≤D4, it means that the actual spatial position and posture of the bend are qualified.

[0045] S3.2: In modern industry, in order to meet more complex installation requirements, multiple bends are often combined and installed, including welding, flange connection and threaded connection. Since the alignment deviation will be transmitted and accumulated along the pipeline, the overall accuracy may be unqualified when assembling multiple qualified bends due to the accumulation of errors.

[0046] The testing principle after assembling multiple sets of bends is the same as that in S3.1. When X4 is found to be unqualified, the staff should check whether the connection is properly connected. If there is a problem with the connection, such as loose flanges and threads, the connection should be re-connected and then tested again. If the connection meets the installation requirements, it means that the unqualification is due to the accumulation of errors, and the connection process and processing process should be optimized.

[0047] A testing method for a pipe bending angle detection device, wherein step S4 includes the following method: S4.1: If obvious deformation or cracks are found in the bend during the S2 and S3 inspections, it indicates that the process parameters during the bend processing were not properly controlled, resulting in unexpected damage to the pipe substrate. In this case, the bend production process should be stopped immediately, and the relevant equipment in the production process should be troubleshooted. If the production equipment is not faulty, it means that there is a problem with the bend design data, which should be optimized and adjusted. After troubleshooting and design optimization, the S2 and S3 inspection processes should be repeated. After passing the inspection, the qualified bend can be sent to the subsequent processing stages.

[0048] S4.2: The analysis module summarizes the test results of S2 and S3 and transmits them to the production and processing stage of the pipe bend, providing real and reliable reference data for optimizing the production process of the pipe bend.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipe bending angle detection device, comprising a machine tool (1), a loading assembly, and a control system, characterized in that: The loading assembly includes a mounting plate (12), which is fixedly mounted on the upper end of the machine tool (1). A protective shell (10) is fixedly mounted on one side of the mounting plate (12). A light-blocking plate (11) is provided in front of the loading assembly. Two sets of connecting rods (13) are symmetrically arranged between the light-blocking plate (11) and the mounting plate (12). The output end of the connecting rod (13) is hinged to the light-blocking plate (11). A sliding seat (14) is hinged to the lower end of the connecting rod (13). The sliding seat (14) is slidably connected to the front end of the mounting plate (12). A fixing rod (15) is provided in front of the light-blocking plate (11). The lower end of the fixing rod (15) is fixedly connected to the machine tool (1). The light-blocking plate (11) and the... The fixed rod (15) is slidably connected. The upper end of the mounting plate (12) is fixedly mounted with a base (16). The upper end of the base (16) is fixedly mounted with a rotating seat (17). The rear end of the rotating seat (17) is provided with a pulley (18). The mounting shaft of the pulley (18) passes through the rotating seat (17) and is connected to the bearing of the rotating seat (17). A circular through hole is opened at the center of the pulley (18). A pipe joint (19) is threaded inside the circular through hole. A second motor (20) is provided below the pulley (18). The second motor (20) is fixedly mounted on the upper end of the machine tool (1) and located inside the protective shell (10). The output end of the second motor (20) is connected to the pulley (18) through a synchronous belt.

2. The pipe bending angle detection device according to claim 1, characterized in that: A frame (2) is mounted on the upper rear side of the machine tool (1). A linear motor (3) is mounted on the front end of the frame (2). A slide table (4) is slidably connected to the upper end of the linear motor (3). The slide table (4) is mounted perpendicular to the linear motor (3). A motor (5) is mounted on the upper end of the slide table (4). A lead screw is installed inside the slide table (4). The output end of the motor (5) passes through the slide table (4) and is fixedly connected to one end of the lead screw. The other end of the lead screw is connected to the bearing of the slide table (4). A nut is connected to the front end of the slide table (4). A sliding plate (6) is provided with a scanning device (7) installed at its front end. The scanning head of the scanning device (7) faces downward. Drag chains are installed at the front end of the frame (2) and the side wall of the slide table (4). A fill light plate (8) is provided above the loading assembly. The fill light plate (8) is hinged to the front end of the frame (2) by a hinge. A scanning window (9) is opened at the upper end of the fill light plate (8). The scanning device (7) is located directly above the scanning window (9). Several lamp tubes are evenly installed at the lower end of the fill light plate (8).

3. A detection method for a pipe bending angle detection device, using the pipe bending angle detection device described in claim 2, characterized in that: Includes the following steps: S1: Securely mount the independent bend to be tested onto the load assembly; S2: Use the scanning device (7) to complete the scanning of the independent bent pipe to be tested, compare the preset processing parameters of the bent pipe, and determine whether the bending pipe processing is qualified. S3: Detect the actual spatial position and attitude of the bent pipe, splice multiple qualified bent pipes detected in S2 into a long bent pipe, repeat the installation operation in S1, repeat the detection operation in S2, and detect whether there are errors caused by tolerance accumulation in multiple bent pipes; S4: Feed back the actual data of the bent pipes in S2 and S3 to the processing link, providing true and reliable reference data for the optimization of the bent pipe production process.

4. The detection method of the pipe bending angle detection device according to claim 3, characterized in that: The S1 includes the following methods: S1.1: The staff uses the pipe joint (19) to complete the fixed installation of the to-be-detected bent pipe, adjust the light-shielding position of the light-shielding plate (11) to reduce the influence of external light sources, and the second motor (20) drives the to-be-detected bent pipe to rotate.

5. The detection method of the pipe bending angle detection device according to claim 3, characterized in that: The S2 includes the following methods: S2.1: The control system powers on the lamp tube at the lower end of the supplementary light plate (8) to make the light shine on the bent pipe, reducing the influence of the bent pipe shadow on the detection result; S2.2: After the control system controls the bent pipe to rotate once, it controls the scanning device (7) to scan the bent pipe once; S2.3: The scanning device (7) transmits the bent pipe outer contour data obtained by scanning within each group of scanning cycles to the analysis module. The analysis module summarizes and analyzes the data, finally obtaining the actual outer contour model of the bent pipe, and comparing and analyzing the data of the model with the design data during the production and processing of the bent pipe to detect whether the bent pipe is qualified; S2.4: After completing the test of a single bending part, conduct a comparative detection to eliminate the errors caused by tolerance accumulation in multiple qualified bending parts.

6. The detection method of the pipe bending angle detection device according to claim 5, characterized in that: The S2.3 includes the following methods: The scanning device (7) transmits all the outer shape data to the analysis module, which is summarized by the analysis module to obtain the actual outer contour model of the bent pipe, and compare and analyze the model data with the processing preset data; Specifically, define the actually measured bending angle as X1, the angle tolerance as ∆X1, and the designed angle as D1; When D1 - ∆X1 ≤ X1 ≤ D1 + ∆X1, X1 meets the tolerance requirements and the actual bending angle is qualified; When X1 < D1 - ∆X1 or X1 > D1 + ∆X1, X1 exceeds the tolerance range and the actual bending angle is unqualified; Define the actually measured bending radius as X2, and the detection principle is the same as the detection principle of the above bending angle.

7. The detection method of the pipe bending angle detection device according to claim 5, characterized in that: The S2.4 includes the following methods: Detect the straight-line segment spacing between every two adjacent bending parts. Define the spacing between two bending parts as X3. The detection principle of X3 is the same as the detection principle in S2.

3. In the actual detection process, the operation order of S2.3 and S2.4 can be arbitrarily exchanged.

8. The detection method of the pipe bending angle detection device according to claim 3, characterized in that: The S3 includes the following methods: S3.1: Take the central axis of the rotating seat (17) as the reference line. The analysis module uses the bent pipe model to analyze the error value between the true position and attitude of the bent pipe and the design value, and judge whether the actual spatial position and attitude of the bent pipe are qualified; S3.2: Assemble multiple sets of grid bends and repeat the operations of S1, S2.1 and S3.

1. When X4 is found to be unqualified, the staff checks whether the connection is reasonable. If there is a connection fault, it should be adjusted in time. If the connection meets the installation requirements, it means that the unqualification is due to the accumulation of errors. In this case, the connection process and processing process should be optimized.

9. The detection method of the pipe bending angle detection device according to claim 8, characterized in that: S3.1 includes the following methods: The error between the actual position and orientation and the design value is defined as X4, and the tolerance is defined as D4. Ideally, X4 equals 0. If X4≤D4, it means that the actual spatial position and orientation of the bend are qualified.

10. The detection method of the pipe bending angle detection device according to claim 3, characterized in that: S4 includes the following methods: S4.1: If obvious deformation or cracks are found in the bend during the inspection process of S2 and S3, it indicates that the process parameters are not properly controlled during the bend processing. Processing should be stopped and optimized. After troubleshooting and design optimization, the inspection process of S2 and S3 should be repeated. After passing the inspection, the qualified bend can be transported to the subsequent processing stage. S4.2: The analysis module summarizes the test results of S2 and S3 and transmits them to the production and processing stage of the pipe bend, providing real and reliable reference data for optimizing the production process of the pipe bend.

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