Casting pipe outer diameter laser detection device and detection method thereof

Abstract

The invention discloses a casting pipe outer diameter laser detection device and a detection method thereof, and relates to the technical field of pipe diameter detection, the casting pipe outer diameter laser detection device comprises a test bench, a first laser ranging mechanism and a second laser ranging mechanism, the test bench is provided with a downward recessed positioning groove, the first laser ranging mechanism is arranged on the test bench, and the second laser ranging mechanism is arranged in the positioning groove. The second laser ranging mechanism is arranged on the test board and is used for measuring the depth from the lower layer of the casting pipe to the interior of the positioning groove. According to the invention, the positioning groove is arranged on the test bench to adapt to self-centering positioning of casting pipes with various pipe diameters, the first laser measuring mechanism is utilized to measure the height of the casting pipe exceeding the top end of the positioning groove, and the second laser measuring mechanism is utilized to measure the depth of the casting pipe sinking into the positioning groove. The outer diameter length of the casting pipe can be obtained by adding the two measured values, the procedure of positioning the casting pipe on a test board is omitted, and the work efficiency of detecting the outer diameter of the casting pipe is improved.

Description

Technical Field

[0001] This invention relates to the field of laser ranging technology, and in particular to a laser detection device and method for the outer diameter of cast pipes. Background Technology

[0002] Cast pipes are a type of casting, generally metal shaped objects obtained through various casting methods. This involves pouring, injecting, sucking or other casting methods into a pre-prepared mold, cooling and then processing it through grinding and other subsequent means to obtain an object with a certain shape, size and performance. The outer diameter inspection is one of the criteria for judging whether the casting dimensions of a cast pipe are qualified.

[0003] Currently, the main method for detecting the outer diameter of cast pipes is laser ranging. A laser beam is emitted by a laser transmitter, and after the laser beam hits the surface of the cast pipe, it is reflected back. The reflected light signal is received by a receiver, and the outer diameter of the cast pipe is calculated by a data processing unit, thereby achieving accurate measurement of the outer diameter of the cast pipe.

[0004] Before measuring with a laser rangefinder, it is necessary to ensure that the laser path of the center of the casting tube is on the same straight line; otherwise, the measurement accuracy will be affected. This leads to the need for manual positioning of the casting tube on the current casting tube outer diameter detection device, which increases the complexity of the casting tube outer diameter detection work and prolongs the time for positioning and disassembly of the casting tube, making it difficult to meet the demand for efficient and convenient detection of the casting tube outer diameter. To address this, we propose a laser detection device and method for casting tube outer diameter. Summary of the Invention

[0005] The purpose of this invention is to provide a laser detection device and method for the outer diameter of cast pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a laser detection device for the outer diameter of a cast pipe, comprising:

[0007] The test bench is provided with a downwardly recessed positioning groove, which allows the casting tube to self-center and be positioned when it falls into the positioning groove.

[0008] The first laser ranging mechanism is set on the test platform to measure the height of the casting tube above the top of the test platform;

[0009] The second laser ranging mechanism is set on the test platform to measure the depth from the lower layer of the casting tube to the positioning groove.

[0010] Preferably, the positioning groove is connected to both sides of the test platform, and the inner walls of both sides of the positioning groove are sloped surfaces whose width gradually decreases from top to bottom.

[0011] Preferably, the second laser ranging mechanism includes:

[0012] A sinking measuring component, wherein the sinking measuring component is a measuring column, the measuring column is vertically set in the middle of the positioning groove, the top of the measuring column is flush with the top of the test platform, and the bottom of the measuring column extends into the interior of the test platform;

[0013] A first laser rangefinder is set above the test platform to measure the height of the first laser rangefinder from the top of the test platform. A reflective screen is fixedly embedded at the top of the test platform and directly below the first laser rangefinder.

[0014] A lifting mechanism is provided inside the test platform to simultaneously lift the first laser rangefinder when the casting tube is in the lower layer of the positioning groove.

[0015] Preferably, the lifting mechanism includes:

[0016] The first support column has a first connecting frame fixedly connected between its top end and the first laser rangefinder, and its bottom end is slidably inserted into the test platform.

[0017] An auxiliary seat is fixedly connected to the inner cavity of the test bench. The auxiliary seat is provided with a piston cavity at the position below the measuring column and the first support column. The bottom of the measuring column and the first support column extends into the piston cavity and is fixedly connected to a piston.

[0018] The oil passage is located at the bottom of the auxiliary seat and is connected to the bottom ends of the two piston chambers. The oil passage is filled with hydraulic oil.

[0019] Preferably, the top of the auxiliary seat is provided with an oil storage chamber for storing hydraulic oil, and the auxiliary seat is provided with a window between the oil storage chamber and the oil passage. An oil delivery pipe connecting the oil storage chamber and the oil passage is provided in the window, and an oil pumping mechanism is provided on the oil delivery pipe. A liquid level sensor is fixedly embedded in the top of the piston chamber inner wall corresponding to the measuring column.

[0020] Preferably, the first laser ranging mechanism includes:

[0021] The second laser rangefinder is located above the first laser rangefinder on one side, and the second laser rangefinder is located on the vertical line at the center of the positioning groove.

[0022] The second pillar has a second connecting frame fixedly connected between its top end and the second laser rangefinder, and its bottom end is inserted into the test platform.

[0023] Preferably, the top of the positioning groove is provided with at least two sets of auxiliary support mechanisms, and the auxiliary casting tube gradually descends from the top of the test platform into the positioning groove.

[0024] Preferably, the auxiliary support mechanism includes:

[0025] The auxiliary support plate has a storage groove on both sides of the positioning groove, and the top of the auxiliary support plate can rotate around the top of the storage groove and be embedded into the storage groove.

[0026] A support plate is movably installed inside the test bench. Lifting columns are fixedly connected to both sides of the top of the support plate. The top of the lifting column is inserted into the storage groove and rotatably connected to a movable rod. Limiting rails are fixedly connected to both sides of the bottom of the auxiliary support plate. The two ends of the movable rod are movably inserted into the inner side of the limiting rail.

[0027] An electric telescopic cylinder is located below the support plate and fixed inside the test bench, so that the electric telescopic cylinder drives the support plate to rise and fall in the vertical direction.

[0028] Preferably, one of the support plates is located on one side of the second pillar, and a jacking member is fixedly connected to one end of the support plate near the second pillar. An upwardly extending cylindrical tube is fixedly connected to the outer wall of the second pillar at a position corresponding to the support plate. An arc-shaped groove is opened on the outer peripheral wall of the cylindrical tube, and the end of the jacking member is movably inserted into the arc-shaped groove. A seated bearing is provided between the second pillar and the bottom of the test platform.

[0029] On the other hand, the present invention also provides a method for detecting the outer diameter of a casting tube, which implements the laser detection device for the outer diameter of a casting tube as described in any one of the above claims, and includes the following steps:

[0030] Step 1: The casting tube is placed on the auxiliary support plate by rolling or hoisting. After the auxiliary support plate senses gravity, the electric telescopic cylinder is activated, which drives the support plate and the lifting column to move down. In conjunction with the movable rod moving inside the limit track, the two auxiliary support plates in opposite positions are driven to rotate downward and gradually embed into the receiving groove. During this process, the casting tube follows the auxiliary support plate to gradually move down and squeezes the measuring column to move downward until the auxiliary support plate is completely embedded in the receiving groove and the casting tube contacts the inner wall of the second laser rangefinder. At this time, the casting tube achieves self-centering positioning in the positioning groove. At this time, the center of the second laser rangefinder and the center of the casting tube are on the same vertical line. The second laser rangefinder detects the height difference between the top of the casting tube and the second laser rangefinder as d1. The height of the second laser rangefinder from the top of the test platform is set as d0. The height dx of the casting tube above the top of the test platform can be obtained by subtracting d0 from d1.

[0031] Step 2: When the casting tube sinks into the positioning groove, it drives the measuring column to move downward. The bottom of the measuring column is pressed into the piston chamber. Since both the piston chamber and the oil passage are filled with hydraulic oil, when the bottom of the measuring column moves downward, it drives the hydraulic oil to flow into another oil passage, lifting the first support column upward by the same height. This makes the measuring column and the first support column move synchronously in opposite directions by the same distance, thereby lifting the first laser rangefinder synchronously upward through the first support column. The initial height of the first laser rangefinder measured to the top of the test platform is set as d2. After the casting tube is positioned in the positioning groove, the height of the first laser rangefinder measured to the top of the test platform is d3. The depth dy of the casting tube sinking into the positioning groove can be obtained by d3-d2. The diameter of the casting tube can be obtained by dx+dy.

[0032] Step 3: While the electric telescopic cylinder lifts and drives the second laser rangefinder to reset, it pushes the auxiliary support plate to reset and pushes the casting tube out of the positioning groove, so that the casting tube can roll directly from the top of the test table or be moved away to complete the unloading. After reloading, the automatic positioning and outer diameter measurement of the casting tube can be carried out.

[0033] Compared with the prior art, the technical effects of the present invention are as follows:

[0034] This invention enables self-centering positioning of castings of various diameters by setting positioning grooves on the testing platform, eliminating the tedious manual positioning process and simplifying the procedure. Simultaneously, a first laser measuring mechanism measures the height of the casting exceeding the top of the positioning groove, and a second laser measuring mechanism measures the depth of the casting submerged in the positioning groove. The outer diameter of the casting is obtained by adding the two measurements, eliminating the need for positioning the casting on the testing platform. Only the loading and unloading of the casting within the positioning groove is required to obtain its outer diameter, thereby improving the efficiency of casting outer diameter inspection. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0037] Figure 2 This is one of the schematic diagrams of the internal three-dimensional structure of the test platform of the present invention.

[0038] Figure 3 This is a three-dimensional cross-sectional view of the auxiliary seat of the present invention.

[0039] Figure 4 This is the second schematic diagram of the internal three-dimensional structure of the test platform of the present invention.

[0040] Figure 5This is a bottom-view three-dimensional structural diagram of the auxiliary support plate of the present invention.

[0041] In the attached image:

[0042] 100. Test stand; 101. Positioning groove; 102. First laser rangefinder; 103. First support column; 104. Reflector; 105. Measuring column; 106. Auxiliary seat; 107. Piston chamber; 108. Oil passage; 109. Oil storage chamber; 110. Second laser rangefinder; 111. Second connecting frame; 112. Second support column; 113. First connecting frame; 114. Storage slot; 115. Auxiliary support plate; 116. Limiting rail; 117. Movable rod; 118. Lifting column; 119. Support plate; 120. Electric telescopic cylinder; 121. Cylindrical cylinder; 122. Arc-shaped slot; 123. Pushing component; 124. Opening section; 125. Oil delivery pipeline; 126. Oil pumping mechanism; 127. Liquid level sensor. Detailed Implementation

[0043] 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.

[0044] This invention provides, for example Figures 1-5 The image shows a laser detection device for the outer diameter of a cast pipe.

[0045] Example 1: Includes a test platform 100, a first laser ranging mechanism, and a second laser ranging mechanism. The test platform 100 has a downwardly recessed positioning groove 101, which is connected to both sides of the test platform 100. The inner walls of the two sides of the positioning groove 101 are sloped, with the width gradually decreasing from top to bottom, allowing the casting tube to self-center and be positioned when it falls into the positioning groove 101. Utilizing the upward-sloping inner walls of the test platform 100, the casting tube can achieve self-centering and positioning when placed in the positioning groove 101. Thus, the first laser measuring mechanism only needs to maintain... The bottom position of the casting tube can be directly measured on the vertical line at the center of the bottom of the positioning groove 101. Furthermore, simply placing the casting tube into the positioning groove 101 eliminates the need for additional self-centering operations, simplifying the casting tube outer diameter inspection process and improving work efficiency. The first laser ranging mechanism is mounted on the test platform 100 to measure the height of the casting tube exceeding the top of the test platform 100. Since the height of the first laser measuring mechanism from the top of the test platform 100 is fixed, it is only necessary to maintain the vertically downward measuring position of the first laser measuring mechanism relative to the positioning groove 101. With the inner cavity centered on the same vertical line, the casting tube can be positioned within the positioning groove 101. The first laser measuring mechanism automatically measures the height between the top of the casting tube and the groove. The computing module within the configured terminal calculates the height of the casting tube above the top of the test platform 100 after positioning within the groove 101, thus obtaining the first measured value of the casting tube's outer diameter. The entire process requires no manual adjustment or operation, achieving automatic detection. The second laser ranging mechanism, located on the test platform 101, measures the depth from the lower layer of the casting tube to the positioning groove 101. The measurement method utilizes a second laser ranging mechanism to measure the depth of the casting tube within the positioning groove 101, thereby obtaining a second measurement value for the outer diameter of the casting tube. The sum of the first and second measurement values ​​directly yields the detection value of the outer diameter of the casting tube. By comparing the detection value with a preset pass threshold, it can be determined whether the outer diameter of the casting tube is cast to be qualified. Throughout the entire measurement and inspection process of the outer diameter of the casting tube, the user only needs to place the casting tube into the positioning groove 101 to achieve self-centering positioning and automatic measurement, making the outer diameter inspection work more efficient and requiring less manpower.

[0046] The first laser ranging mechanism includes a second laser rangefinder 110, which is located above the first laser rangefinder 102 and on the vertical line at the center of the positioning groove 101. A second connecting frame 111 is fixedly connected between the top of the second support column 112 and the second laser rangefinder 110. The bottom of the second support column 112 is inserted into the test table 100. During measurement, the second laser rangefinder 110 needs to be located directly above the center of the positioning groove 101 to ensure consistency with the positioning groove 101 in positioning the casting tube, so that the second laser rangefinder 110 can measure the distance to the top position above the center of the casting tube.

[0047] Furthermore, the second laser ranging mechanism includes a sinking measuring component, a first laser rangefinder 102, and a lifting mechanism. The sinking measuring component is a measuring column 105, which is vertically positioned in the middle of the positioning groove 101. The top of the measuring column 105 is flush with the top of the test platform 100, and the bottom of the measuring column 105 extends into the interior of the test platform 100 to measure the depth of the bottom of the casting tube sunk into the positioning groove 101. The first laser rangefinder 102 is positioned above the test platform 100, with the top of the test platform 100 located at the first laser rangefinder. A reflector 104 is fixedly embedded directly below the rangefinder 102 to measure the height of the first laser rangefinder 102 from the top of the test platform 100. A lifting mechanism is set inside the test platform 100 so that the first laser rangefinder 102 is lifted synchronously when the casting tube is lowered in the positioning groove 101. In a specific embodiment, when the casting tube is lowered in the positioning groove 101, it will drive the measuring column 105 to descend by the same depth. The descent depth of the casting tube can be obtained by detecting the descent depth of the measuring column 105 by the first laser rangefinder 102.

[0048] In a preferred embodiment, the lifting mechanism includes a first support column 103 and an auxiliary seat 106. A first connecting frame 113 is fixedly connected between the top of the first support column 103 and the first laser rangefinder 102. The bottom of the first support column 103 is slidably inserted into the test bench 100. The auxiliary seat 106 is fixedly connected to the inner cavity of the test bench 100. The auxiliary seat 106 is provided with piston chambers 107 at the positions below the measuring column 105 and the first support column 103. The bottoms of the measuring column 105 and the first support column 103 extend into the piston chambers 107 and are fixedly connected to pistons. An oil passage 108 is provided at the bottom of the auxiliary seat 106 and communicates with the bottom ends of the two piston chambers 107. The oil passage 108 is filled with hydraulic oil. A counterweight can be added to the first support column 103 so that the weight on the first support column 103 is greater than the weight on the measuring column 105. In this way, in the initial state, the first support column 103 will sink to the bottom of the piston chamber 107 and be blocked. As the first support column 103 sinks, As the bottom piston moves downward within the piston chamber 107, hydraulic oil is injected through the oil passage 108 into the piston chamber 107 connected to the measuring column 105. This causes the hydraulic oil to push the bottom piston of the measuring column 105 upward along the piston chamber 107. In this initial state, the top of the measuring column 105 is on the same horizontal plane as the top of the test platform 100. Similarly, when the casting tube sinks in the positioning groove 101, its own weight is greater than the weight on the first support column 103, thus pushing the measuring column 105 downward. This causes hydraulic oil to be injected through the oil passage 108 into the piston chamber 107 at the position of the first support column 103. Since the two piston chambers 107 are the same size, after the casting tube is positioned in the positioning groove 101, the height to which the measuring column 105 descends is driven by the hydraulic oil to raise the first support column 103 by the same height. In this way, the height difference between the front and rear of the first laser rangefinder 102 and the reflector screen 104 can be measured (equal to the distance the casting tube sinks into the positioning groove 101).

[0049] Additionally, the top of the auxiliary seat 106 is provided with an oil storage chamber 109 for storing hydraulic oil. An opening 124 is located between the oil storage chamber 109 and the oil passage 108 on the auxiliary seat 106. An oil delivery pipe 125 connecting the oil storage chamber 109 and the oil passage 108 is located within the opening 124. An oil pumping mechanism 126 is installed on the oil delivery pipe 125. A liquid level sensor 127 is fixedly embedded in the top of the inner wall of the piston chamber 107 corresponding to the measuring column 105. When the measuring column 105 is in its initial position, the oil level in the corresponding piston chamber 107 corresponds to the height of the liquid level sensor 127, thus determining whether the initial position of the measuring column 105 is accurate. When the liquid level sensor 127... When the oil level in the piston chamber 107 is detected to be too low, a signal is transmitted to the control terminal, which drives the oil pumping mechanism 126 to input the hydraulic oil in the oil storage chamber 109 into the oil passage 108 through the oil delivery pipe 125, thereby raising the oil level in the piston chamber 107 at the measuring column 105. Conversely, when the oil level is too high, some of the hydraulic oil in the oil passage 108 is drawn into the oil storage chamber 109 to keep the oil level in the piston chamber 107 at the corresponding height. The oil pumping mechanism 126 can be an existing axial piston pump, or it can be a pumping assembly combining a solenoid valve, a flow meter, and an oil pump. At the same time, an oil filling pipe can also be set at the top of the auxiliary seat 106 to facilitate the addition of oil to the oil storage chamber 109.

[0050] Example 2: Based on Example 1, at least two sets of auxiliary support mechanisms are provided at the top of the positioning groove 101. The auxiliary casting tube gradually descends from the top of the test bench 100 into the positioning groove 101. The auxiliary support mechanism includes an auxiliary support plate 115, a support plate 119, and an electric telescopic cylinder 120. A receiving groove 114 is provided on both sides of the inclined surface of the positioning groove 101. The top of the auxiliary support plate 115 can rotate around the top of the receiving groove 114 and be embedded into the receiving groove 114. The support plate 119 is movably disposed inside the test bench 100. Lifting columns 118 are fixedly connected to both sides of the top of the support plate 119. The top of the lifting column 118 is inserted into the receiving groove 114 and rotatably connected to a movable rod 117. Limit rails 116 are fixedly connected to both sides of the bottom of the auxiliary support plate 115. The movable rod 117... The end is inserted into the inner side of the limiting rail 116. The electric telescopic cylinder 120 is located below the support plate 119 and fixed inside the test bench 100, so that the electric telescopic cylinder 120 drives the support plate 119 to rise and fall in the vertical direction. By rotating and unfolding the auxiliary support plate 115 in the storage groove 114 to the horizontal position, the casting tube can be assisted to support the port position of the positioning groove 101, so that the casting tube can roll at the top of the test bench 100, which facilitates the loading and unloading of the casting tube at the top of the test bench 100, reducing the user's workload. As the auxiliary support plate 115 gradually rotates downward until it is embedded in the storage groove 114, the casting tube can be slowly lowered into the positioning groove 101, avoiding the impact caused by excessive speed, which may cause other parts to loosen, misalign or deform, thus affecting the accuracy of its outer diameter detection.

[0051] Furthermore, one of the support plates 119 is located on one side of the second pillar 112. A pusher 123 is fixedly connected to one end of the support plate 119 near the second pillar 112. A cylindrical tube 121 extending upwards is fixedly connected to the outer wall of the second pillar 112 at a position corresponding to the support plate 119. An arc-shaped slot 122 is formed on the outer peripheral wall of the cylindrical tube 121. The end of the pusher 123 is movably inserted into the arc-shaped slot 122. A bearing with a seat is provided between the second pillar 112 and the bottom of the test platform 100. During the lifting and lowering process, the cylindrical tube 123 fixedly connected to the outer wall of the second pillar 112... The cylinder 121 has an arc-shaped slot 122, and the area extended by the arc-shaped slot 122 reaches a quarter circle of the cylindrical cylinder 121. When the top actuator 123 moves from the bottom end to the top end within the arc-shaped slot 122, it will cause the cylindrical cylinder 121 to rotate 90 degrees, thereby causing the second support column 112 to rotate 90 degrees. In this way, the initial position of the second laser rangefinder 110 can be arranged on the side away from the positioning groove 101, thus leaving the area above the positioning groove 101 completely empty to facilitate the hoisting of the casting tube into the positioning groove 101 and avoid obstruction.

[0052] A method for detecting the outer diameter of a cast pipe, implementing a laser detection device for the outer diameter of a cast pipe as described in the above embodiments, includes the following steps:

[0053] Step 1: The casting tube is placed on the auxiliary support plate 115 by rolling or hoisting. After the auxiliary support plate 115 senses gravity, the electric telescopic cylinder 120 is activated, causing the support plate 119 and the lifting column 118 to move downwards. In conjunction with the movable rod 117 moving inside the limit track 116, the two auxiliary support plates 115 in opposite positions will rotate downwards and gradually embed into the receiving groove 114. During this process, the casting tube follows the auxiliary support plate 115 to gradually descend and presses the measuring column 105 downwards until the auxiliary support plate 115 is completely lowered. When the casting tube is fully embedded in the storage groove 114 and in contact with the inner wall of the second laser rangefinder 110, the casting tube achieves self-centering positioning in the positioning groove 101. At this time, the center of the second laser rangefinder 110 and the center of the casting tube are on the same vertical line. The second laser rangefinder 110 detects the height difference between the top of the casting tube and the second laser rangefinder 110 as d1. The height of the second laser rangefinder 110 from the top of the test platform 100 is set as d0. The height dx of the casting tube exceeding the top of the test platform 100 can be obtained by subtracting d0 from d1.

[0054] Step 2: When the casting tube sinks into the positioning groove 101, it drives the measuring column 105 to move downward. The bottom of the measuring column 105 is pressed into the piston chamber 107. Since both the piston chamber 107 and the oil passage 108 are filled with hydraulic oil, when the bottom of the measuring column 105 moves downward, it drives the hydraulic oil to flow into the other oil passage 108, which lifts the first support column 103 upward to the same height. This causes the measuring column 105 and the first support column 103 to move synchronously in opposite directions by the same distance. Thus, the first laser rangefinder 102 is synchronously lifted upward through the first support column 103. The initial height of the first laser rangefinder 102 measured to the top of the test platform 100 is set as d2. After the casting tube is positioned in the positioning groove 101, the height of the first laser rangefinder 102 measured to the top of the test platform 100 is d3. The depth dy of the casting tube sinking into the positioning groove 101 can be obtained by d3-d2. The diameter of the casting tube can be obtained by dx+dy.

[0055] Step 3: While the electric telescopic cylinder 120 lifts and drives the second laser rangefinder 110 to reset, it pushes the auxiliary support plate 115 to reset and push the casting tube out of the positioning groove 101, so that the casting tube can roll directly from the top of the test table 100 or be moved away to complete the unloading. After reloading, the automatic positioning and outer diameter measurement of the casting tube can be carried out.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is 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 laser detection device for the outer diameter of cast pipes, characterized in that, include: The test bench (100) is provided with a downwardly recessed positioning groove (101) so that the casting tube can be self-centered and positioned when it falls into the positioning groove (101). The first laser ranging mechanism is set on the test platform (100) to measure the height of the casting tube above the top of the test platform (100); The second laser ranging mechanism is set on the test table (100) to measure the depth from the lower layer of the casting tube to the positioning groove (101).

2. The laser detection device for the outer diameter of a cast pipe according to claim 1, characterized in that, The positioning groove (101) is connected to both sides of the test platform (100), and the inner walls of both sides of the positioning groove (101) are sloped surfaces with the width gradually decreasing from top to bottom.

3. The laser detection device for the outer diameter of a cast pipe according to claim 1, characterized in that, The second laser ranging mechanism includes: The sinking measuring component is a measuring column (105). The measuring column (105) is vertically set in the middle of the positioning groove (101). The top of the measuring column (105) is flush with the top of the test table (100). The bottom of the measuring column (105) extends into the interior of the test table (100). A first laser rangefinder (102) is set above the test platform (100) to measure the height of the first laser rangefinder (102) from the top of the test platform (100). A reflective screen (104) is fixedly embedded at the top of the test platform (100) and directly below the first laser rangefinder (102). A lifting mechanism is provided inside the test platform (100) to simultaneously lift the first laser rangefinder (102) when the casting tube is in the lower layer of the positioning groove (101).

4. The laser detection device for the outer diameter of a cast pipe according to claim 3, characterized in that, The lifting mechanism includes: The first support column (103) is fixedly connected to the top of the first support column (103) and the first laser rangefinder (102) with a first connecting frame (113). The bottom end of the first support column (103) is slidably inserted into the test platform (100). An auxiliary seat (106) is fixedly connected to the inner cavity of the test bench (100). The auxiliary seat (106) is provided with a piston cavity (107) at a position below the measuring column (105) and the first support column (103). The bottom of the measuring column (105) and the first support column (103) extends into the piston cavity (107) and is fixedly connected with a piston. Oil passage (108) is located at the bottom of auxiliary seat (106) and connected to the bottom of two piston chambers (107). The oil passage (108) is filled with hydraulic oil.

5. The laser detection device for the outer diameter of a cast pipe according to claim 4, characterized in that, The auxiliary seat (106) is provided with an oil storage chamber (109) for storing hydraulic oil at the top. An empty window (124) is provided on the auxiliary seat (106) between the oil storage chamber (109) and the oil passage (108). An oil delivery pipe (125) connecting the oil storage chamber (109) and the oil passage (108) is provided in the empty window (124). An oil pumping mechanism (126) is provided on the oil delivery pipe (125). A liquid level sensor (127) is fixedly embedded on the top of the inner wall of the piston chamber (107) corresponding to the measuring column (105).

6. The laser detection device for the outer diameter of a cast pipe according to claim 1, characterized in that, The first laser ranging mechanism includes: The second laser rangefinder (110) is located above the first laser rangefinder (102) on one side, and the second laser rangefinder (110) is located on the vertical line at the center of the positioning groove (101). The second pillar (112) has a second connecting frame (111) fixedly connected between the top of the second pillar (112) and the second laser rangefinder (110), and the bottom of the second pillar (112) is inserted into the test platform (100).

7. The laser detection device for the outer diameter of a cast pipe according to claim 6, characterized in that, The top of the positioning groove (101) is provided with at least two sets of auxiliary support mechanisms, and the auxiliary casting tube gradually descends from the top of the test platform (100) into the positioning groove (101).

8. The laser detection device for the outer diameter of a cast pipe according to claim 7, characterized in that, The auxiliary support mechanism includes: The auxiliary support plate (115) has a storage groove (114) on both sides of the positioning groove (101). The top of the auxiliary support plate (115) can rotate around the top of the storage groove (114) and be embedded into the storage groove (114). A support plate (119) is movably disposed inside the test bench (100). Lifting columns (118) are fixedly connected to both sides of the top of the support plate (119). The top of the lifting column (118) is inserted into the storage groove (114) and a movable rod (117) is rotatably inserted. Limiting rails (116) are fixedly connected to both sides of the bottom of the auxiliary support plate (115). The two ends of the movable rod (117) are movably inserted into the inside of the limiting rails (116). An electric telescopic cylinder (120) is located below the support plate (119) and fixed inside the test bench (100), so that the electric telescopic cylinder (120) drives the support plate (119) to rise and fall in the vertical direction.

9. The laser detection device for the outer diameter of a cast pipe according to claim 8, characterized in that, One of the support plates (119) is located on one side of the second pillar (112). A pusher (123) is fixedly connected to one end of the support plate (119) near the second pillar (112). An upwardly extending cylindrical tube (121) is fixedly connected to the outer wall of the second pillar (112) at the corresponding position of the support plate (119). An arc-shaped slot (122) is opened on the outer peripheral wall of the cylindrical tube (121). The end of the pusher (123) is movably inserted into the arc-shaped slot (122). A seated bearing is provided between the second pillar (112) and the bottom of the test table (100).

10. A method for detecting the outer diameter of a cast pipe, comprising the laser detection device for detecting the outer diameter of a cast pipe as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: The casting tube is placed on the auxiliary support plate (115) by rolling or hoisting. After the auxiliary support plate (115) senses gravity, the electric telescopic cylinder (120) moves, causing the support plate (119) and the lifting column (118) to move downward. In conjunction with the movable rod (117) moving inside the limit track (116), the two auxiliary support plates (115) in opposite positions can be driven downward and gradually embedded into the receiving groove (114). During this process, the casting tube follows the auxiliary support plate (115) to gradually move down and squeeze the measuring column (105) downward until the auxiliary support plate (119) moves downward. 5) When the casting tube is fully embedded in the storage groove (114) and in contact with the inner wall of the second laser rangefinder (110), the casting tube is self-centered in the positioning groove (101). At this time, the second laser rangefinder (110) and the center of the casting tube are on the same vertical line. The second laser rangefinder (110) detects the height difference between the top of the casting tube and the second laser rangefinder (110) as d1. The height of the second laser rangefinder (110) from the top of the test platform (100) is set as d0. The height dx of the casting tube exceeding the top of the test platform (100) can be obtained by d0-d1. Step 2: When the casting tube sinks into the positioning groove (101), it drives the measuring column (105) to move downward. The bottom of the measuring column (105) is pressed into the piston chamber (107). Since both the piston chamber (107) and the oil passage (108) are filled with hydraulic oil, when the bottom of the measuring column (105) moves downward, it drives the hydraulic oil to flow into the other oil passage (108), pushing the first support column (103) upward to the same height, so that the measuring column (105) and the first support column (103) move synchronously and in opposite directions by the same distance. The first laser rangefinder (102) is raised synchronously by the first support (103). The initial height of the first laser rangefinder (102) measured to the top of the test platform (100) is set as d2. After the casting tube is positioned in the positioning groove (101), the height of the first laser rangefinder (102) measured to the top of the test platform (100) is d3. The depth dy of the casting tube sinking into the positioning groove (101) can be obtained by d3-d2. The diameter of the casting tube can be obtained by dx+dy. Step 3: While the electric telescopic cylinder (120) lifts and drives the second laser rangefinder (110) to reset, it pushes the auxiliary support plate (115) to reset and push the casting tube out of the positioning groove (101), so that the casting tube can roll directly from the top of the test table (100) or be moved away to complete the unloading. After reloading, the automatic positioning and outer diameter measurement of the casting tube can be carried out.

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