Method for rapidly detecting density of pipe

Abstract

The invention relates to the technical field of plastic density measurement, and discloses a method for rapidly detecting the density of a pipe, which comprises the following steps: step 1, preparing a detection device, arranging a plurality of detection points on the detection device along the longitudinal direction, taking any one of the detection points at two ends as a detection starting point, and taking the other detection point as a detection end point, medium liquid with known density is contained in the detection device; step 2, fixing a cylindrical pipe to be detected on the detection device, wherein the initial position of the pipe to be detected is flush with the detection starting point; step 3, the detection device loosens the to-be-detected pipe, the to-be-detected pipe moves from the detection starting point to the detection end point in the medium liquid, and the speed and time of reaching each detection point are measured; 4, the density of the pipe to be measured is obtained according to the speed and time measured in the step 3 and the relational expression rho1 = f (v, t). In practical application, a high-precision electronic balance is not needed, the whole detection method is simple, and the portability and the flexibility are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic density measurement, and in particular to a method for quickly detecting the density of a pipe. Background Art

[0002] Plastic pipes play a vital role in modern infrastructure construction and are widely used in urban water supply projects, building internal and external water supply projects, farmland water conservancy and irrigation projects, and industrial and mining enterprise water supply projects. As one of the important parameters for determining the quality of pipe products, density is directly related to the safety and reliability of pipes.

[0003] At present, the density test of plastic pipes in China is mainly based on the national standard GB / T 1033.1-2008 "Determination of density of plastics, non-foamed plastics Part 1: Immersion method, liquid pycnometer method and titration method". Among them, the immersion method has become the most commonly used density test method due to its high accuracy. This method uses an electronic balance to measure the mass of the pipe to be tested in deionized water and air respectively, and converts it in combination with the density of water to obtain the density value of the pipe to be tested.

[0004] Although the immersion method can provide relatively accurate results, its testing process has certain limitations. Since high-precision electronic balances have high requirements for environmental conditions, they need to be preheated before use, and they need to be recalibrated after changing the installation position. This makes this method unsuitable for carrying out tests, limiting its scope of application. Therefore, the existing density detection methods still need to be improved in terms of flexibility and portability to meet the actual needs in different scenarios. Summary of the invention

[0005] The present invention aims to provide a method for quickly detecting the density of a pipe, so as to improve the flexibility and convenience of the pipe density detection.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for quickly detecting the density of a pipe, comprising the following steps:

[0007] Step 1, prepare a detection device, wherein the detection device is provided with a plurality of detection points along the longitudinal direction, wherein any detection point located at the two ends is a detection starting point, and the other detection point is a detection end point, and a medium liquid with a known density is contained in the detection device;

[0008] Step 2: Fix the pipe to be tested on the testing device, and the initial position of the pipe to be tested is flush with the testing starting point;

[0009] Step 3: The testing device releases the pipe to be tested, and the pipe to be tested moves from the testing starting point to the testing end point in the medium liquid, and the speed and time to reach each testing point are measured;

[0010] Step 4: Based on the speed and time measured in step 3, and the relationship ρ 1 =f(v, t) to obtain the density of the pipe to be tested; when the density of the pipe to be tested is greater than the density of the medium liquid, the specific relationship is:

[0011]

[0012] When the density of the pipe to be tested is less than the density of the medium liquid, the specific relationship is:

[0013]

[0014] In the above relationship, v is the instantaneous speed of the pipe to be tested, t is the time from the pipe to each test point, and ρ 1 is the density of the pipe to be tested, ρ 2 is the density of the medium liquid, C d is the drag coefficient, g is the acceleration of gravity, h is the height of the pipe to be tested, C 3 is a constant.

[0015] The principles and advantages of this solution are:

[0016] 1. In actual application, this scheme estimates the density of the pipe to be tested by recording the time, distance and final velocity from the starting point of the test to each test point including the end point of the test through the free fall of the pipe to be tested in the medium liquid of known density. Compared with the immersion method, this method does not rely on a high-precision electronic balance, does not require preheating and calibration, and is more convenient and quicker overall. In addition, the existing pipe density test often needs to be carried out in an actual factory environment, and the electronic balance used is a high-precision device. Since the factory environment usually does not have ideal laboratory conditions, on-site testing is difficult. The detection scheme of this scheme and the detection device used do not require strict temperature and humidity control, and can be used in various actual factory environments, greatly improving the flexibility and scope of application of the test.

[0017] 2. In this scheme, the pipe to be tested starts to move from the detection starting point, and speed and time detection are performed when passing through multiple subsequent detection points. The detection starting point is combined with any other detection point to obtain a pipe density value. The entire detection process can obtain multiple sets of data. Multiple density values ​​reduce the error caused by single-point measurement and can help identify local anomalies or unevenness. On the other hand, multiple density values ​​can be processed by statistical methods such as taking the average value to further improve the stability and reliability of the measurement results. This scheme can obtain multiple sets of data containing ρ according to the above formula. 2 and C d The equation is used to calculate the resistance coefficient of the corresponding pipe to be tested, and the accuracy of the resistance coefficient is relatively high.

[0018] 3. The scheme has a wide detectable pipe density range, and can measure the pipe density whether it is greater than or less than the medium liquid density. When the pipe density is greater than the medium liquid density, the pipe to be tested moves from top to bottom in the medium liquid. When the pipe density is less than the medium liquid density, the pipe to be tested moves from bottom to top in the medium liquid, which is regarded as reverse free fall motion. Therefore, the scheme has a wide detectable density range and strong versatility.

[0019] 4. This solution can complete density detection in a short time by measuring the movement speed and time of the pipe to be tested in the medium liquid, which greatly shortens the detection cycle compared with traditional methods. It can also obtain and process data in real time, provide fast feedback on test results, and help to adjust production parameters or quality control measures in a timely manner.

[0020] 5. Compared with expensive equipment such as high-precision electronic balances, this detection device has a low cost and is easy to promote and apply on a large scale. The simple and easy-to-understand operation steps and technical principles in this scheme make this method suitable not only for professional technicians, but also for front-line workers, and has wide applicability.

[0021] Further, in step 1, when the density of the pipe to be tested is greater than the density of the medium liquid, the detection point located at the top is the detection starting point; when the density of the pipe to be tested is less than the density of the medium liquid, the detection point located at the bottom is the detection starting point.

[0022] Furthermore, the medium liquid is a small molecule liquid.

[0023] Small molecule liquids usually have lower viscosity and higher surface tension, which helps to reduce the formation of bubbles in the liquid, reduce interference with the movement trajectory of the pipe, reduce measurement errors, and improve measurement accuracy; at the same time, low-viscosity small molecule liquids can flow more smoothly, making the movement of the pipe to be tested in the liquid more stable and smooth, reducing measurement errors caused by uneven liquid resistance.

[0024] Furthermore, in step 2, when the pipe to be tested is at the initial position, its end surface is in a horizontal state.

[0025] The horizontal end face of the pipe to be tested ensures that it can be evenly subjected to gravity and buoyancy when released. The speed distribution of the pipe to be tested in the medium liquid is more uniform, which makes it easier for the laser sensor to accurately capture speed changes and ensure the reliability of speed measurement results. On the other hand, the horizontal state serves as a standard starting position, which makes it easier for operators to quickly calibrate and adjust the detection device to ensure the consistency of measurement results.

[0026] Furthermore, when the pipe to be tested is at the starting point of the test, t = 0, v = 0, according to the boundary conditions, the constant C 3 =0.

[0027] The above settings ensure that each measurement starts from exactly the same starting state. This consistency reduces the error caused by different starting conditions, thereby improving the accuracy of the final density calculation results. 3 As the integral constant of the motion equation, setting it to 0 can simplify the motion equation, reduce the influence of unnecessary parameters, and make the model more concise and reliable.

[0028] Furthermore, the detection device includes a base, on which a cylindrical glass container is fixed, and a clamping mechanism for clamping the pipe to be tested is provided at the opening of the glass container; a bracket is provided on the outer periphery of the glass container, and laser sensors are provided at the detection starting point and the detection end point, and the laser sensor includes a transmitter and a receiver, and the transmitter and the receiver are respectively arranged on the brackets on both sides of the glass container; both laser sensors are communicatively connected to the computing unit.

[0029] The clamping mechanism of the detection device is used to make the pipe to be tested have the same initial position. Then, when the pipe to be tested moves in the medium liquid, it passes through the detection starting point and detection end point successively. The laser sensors at the two detection points measure the time and speed. The measured time and speed are then calculated by the calculation unit to finally obtain the estimated pipe density. The overall operation is simple and fast. Compared with the immersion method, there is no need to calibrate and preheat the equipment frequently. Moreover, the automatic measurement of speed and time reduces the possibility of manual intervention and reduces the human error introduced by improper operation.

[0030] Furthermore, the longitudinal height between the detection starting point and the detection end point is 50-100 cm.

[0031] The height distance between the two detection points is limited to 50-100cm. First, it is to ensure that the pipe to be tested has a relatively stable acceleration in the medium liquid and to ensure the accuracy of the speed measured at the detection end point. The height range of 50-100cm is neither too short to obtain sufficient speed change data, nor too high to cause the pipe to move too fast, causing unnecessary nonlinear effects such as impact vibration. This makes the entire detection process more stable and reliable; second, it is to limit the overall volume of the detection device to prevent the volume from being too large and reducing portability.

[0032] Further, the diameter of the glass container is 30-80 cm.

[0033] The above diameter range makes the detection device suitable for most pipes except large pipes such as sewage pipes, and the density detection range is wide; and the overall volume of the detection device is small, easy to carry, and suitable for outdoor detection.

[0034] Furthermore, the detection device also includes a lifting mechanism arranged on the bottom wall of the glass container, the lifting mechanism includes a lifting platform and a lifting drive part, and the lifting platform is in a cross shape.

[0035] The lifting mechanism is used to lift the pipe to be tested that has sunk to the bottom of the glass container upwards for easy removal, avoiding the use of other auxiliary clamps or manual insertion into the medium liquid to remove the pipe to be tested, which may cause contamination to the medium liquid and increase subsequent measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the force on the pipe to be tested in the medium liquid (the density of the pipe to be tested is greater than that of the medium liquid).

[0037] Figure 2 Schematic diagram of the force on the pipe to be tested in the medium liquid (the density of the pipe to be tested is smaller than that of the medium liquid).

[0038] Figure 3 This is a front view structure of the detection device of Example 2 of the present invention.

[0039] Figure 4 for Figure 3 A partial enlarged view of part A.

[0040] Figure 5 It is a top view of the detection device of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0041] The following is further described in detail through specific implementation methods:

[0042] The figure marks in the drawings of the specification include: detection device 100, base 1, glass container 2, bracket 3, laser sensor 4, clamping mechanism 5, clamping cylinder 51, clamping block 52, fixing platform 53, fixing block 54, pin 55, lifting mechanism 6, electric telescopic rod 61, lifting platform 62, single chip computer 7.

[0043] Example 1

[0044] A method for quickly detecting the density of a pipe comprises the following steps:

[0045] Step 1, prepare the detection device 100, which is provided with multiple detection points along the longitudinal direction, wherein any detection point at the two ends is the detection starting point, and the other detection point is the detection end point, and the detection device 100 contains a medium liquid with a known density. When the density of the pipe to be tested is greater than the density of the medium liquid, the detection point located at the top is the detection starting point; when the density of the pipe to be tested is less than the density of the medium liquid, the detection point located at the bottom is the detection starting point.

[0046] The medium liquid is a small molecule liquid, such as water, ethanol, etc. Small molecule liquids usually have lower viscosity and higher surface tension, which helps to reduce the formation of bubbles in the liquid and reduce the interference with the movement trajectory of the pipe to be tested. In addition, low-viscosity small molecule liquids can flow more smoothly, making the movement of the pipe to be tested in the liquid more stable and smooth, reducing the measurement error caused by uneven liquid resistance.

[0047] Step 2: Fix the pipe to be tested on the detection device 100, the initial position of the pipe to be tested is flush with the detection starting point, and the pipe to be tested is completely immersed in the medium liquid; and the end face of the pipe to be tested is in a horizontal state, and the axis of the pipe to be tested is in a vertical state. This ensures that the pipe to be tested can be evenly subjected to gravity and buoyancy when released, and the velocity distribution in the medium liquid is more uniform.

[0048] Step 3: The testing device 100 releases the pipe to be tested, and the pipe to be tested moves from the testing starting point to the testing end point in the medium liquid, and the speed and time of the pipe to be tested reaching each testing point are measured.

[0049] Step 4: Based on the speed and time at each detection point measured in step 3, and the relationship ρ 1 =f(v, t) to obtain the density of the pipe to be tested;

[0050] When the density of the pipe to be tested is greater than the density of the medium liquid, the specific relationship is:

[0051]

[0052] When the density of the pipe to be tested is less than the density of the medium liquid, the specific relationship is:

[0053]

[0054] In the above relationship, v is the instantaneous speed of the pipe to be tested, t is the time from the pipe to each test point, and ρ 1 is the density of the pipe to be tested, ρ 2 is the density of the medium liquid, C d is the drag coefficient, g is the acceleration of gravity, h is the height of the pipe to be tested, C 3 is a constant.

[0055] The pipe to be tested starts to move from the detection starting point, and speed and time detection are performed when passing through multiple subsequent detection points. The detection starting point is combined with any other detection point to obtain a pipe density value. The entire detection process can obtain multiple sets of data. Multiple density values ​​reduce the error caused by single-point measurement and can help identify local anomalies or unevenness. On the other hand, multiple density values ​​can be processed by statistical methods such as taking the average value to further improve the stability and reliability of the measurement results. This scheme can obtain multiple sets of density values ​​containing ρ according to the above formula.2 and C d The equation is used to calculate the resistance coefficient of the corresponding pipe to be tested, and the accuracy of the resistance coefficient is relatively high.

[0056] When the density of the pipe to be tested is greater than the density of the medium liquid, the pipe to be tested will gradually sink in the medium liquid. The force on the pipe to be tested when it falls freely in the medium liquid is as follows: Figure 1 As shown in the figure, the pipe to be tested is subjected to gravity (G), buoyancy (F 浮 ) and fluid resistance (F 阻 ):

[0057] Force analysis:

[0058]

[0059] Equations of motion:

[0060]

[0061] Among them, m is the mass of the pipe to be tested, V is the volume of the pipe to be tested, and S is the area of ​​the flow-facing surface of the pipe to be tested.

[0062] Combining the force analysis with the equation of motion, we get the formula transformation:

[0063]

[0064] Then integrate and obtain v = f(ρ 1 , the specific expression of t):

[0065]

[0066] Among them, when the pipe to be tested is at the starting point of the test, t = 0, v = 0, according to the boundary conditions, C 3 = 0. This ensures that each measurement starts from exactly the same starting state. This consistency reduces the error caused by different starting conditions, thereby improving the accuracy of the final density calculation result. In addition, C 3 As the integral constant of the motion equation, setting it to 0 can simplify the motion equation, reduce the influence of unnecessary parameters, and make the model more concise and reliable.

[0067] When the density of the pipe to be tested is less than the density of the medium liquid, the pipe to be tested is placed at the bottom of the detection device. The pipe to be tested will gradually float up in the medium liquid and perform reverse free fall motion. The force applied to the pipe to be tested when it floats up in the medium liquid is as follows: Figure 2 As shown in the figure, the pipe to be tested is subjected to gravity (G), buoyancy (F 浮 ) and fluid resistance (F 阻 ):

[0068] Force analysis:

[0069]

[0070] Equations of motion:

[0071]

[0072] Combining the force analysis with the equation of motion, we get the formula transformation:

[0073]

[0074] Then integrate and obtain v = f(ρ 1 , the specific expression of t):

[0075]

[0076] Among them, when the pipe to be tested is at the starting point of the test, t = 0, v = 0, according to the boundary conditions, C 3 =0.

[0077] In the above detection method, the density of the pipe to be tested is estimated by recording the time, distance and final velocity from the detection start point to the detection end point by letting the pipe to be tested fall freely in a medium liquid with known density. Compared with the immersion method, this method does not rely on a high-precision electronic balance, does not require preheating and calibration, and is more convenient and faster overall. In addition, it does not require strict temperature and humidity control and can be used in various actual factory environments, greatly improving the flexibility and scope of application of the detection.

[0078] Example 2

[0079] This solution provides a detection device 100, combined with Figure 3-Figure 4 As shown, the detection device 100 includes a base 1, on which a cylindrical, transparent organic glass container 2 is fixed, and a clamping mechanism 5 is provided at the opening of the glass container 2, and the clamping mechanism 5 includes two symmetrically arranged clamping blocks 52 and a clamping cylinder 51, and the two clamping blocks 52 are arc-shaped on opposite sides, and the clamping blocks 52 and the output shaft ends of the clamping cylinder 51 are detachably connected; a protruding fixing platform 53 is provided at the output shaft end of the clamping cylinder 51, and a transversely opened groove is provided in the middle of the fixing platform 53, and a fixing block 54 that cooperates with the groove of the fixing platform 53 is provided on the side of the clamping block 52 facing the clamping cylinder 51, and pin holes are opened on the fixing platform 53 and the fixing block 54, and the fixing block 54 extends into the groove, and a pin shaft 55 is installed in the corresponding pin hole for fixing.

[0080] Preferably, a retractable connecting rod (not shown) is further provided between the clamping block 52 and the clamping cylinder 51, and a fixing block 54 and a fixing platform 53 are respectively provided at both ends of the connecting rod, and the upper end of the connecting rod is connected to the clamping cylinder 51, and the lower end is connected to the clamping block 52. The above arrangement facilitates the initial fixation of the pipe whose density is less than the density of the medium liquid.

[0081] like Figure 3 As shown, a bracket 3 is provided on the periphery of the glass container 2, and a plurality of detection points are provided in the longitudinal direction, and a laser sensor 4 is provided at each detection point. The laser sensor 4 includes a transmitter and a receiver, and the transmitter and the receiver are respectively and parallelly arranged on the bracket 3 on both sides of the glass container 2; preferably, as Figure 5 As shown, the laser sensor 4 and the clamping cylinder 51 are staggered in the circumferential direction, so that when the density of the pipe is less than the density of the medium liquid, the clamp block 52 will not affect the detection of the pipe to be tested by the laser sensor 4 when the clamp block 52 initially fixes the pipe to be tested; both laser sensors 4 are connected to the computing unit for communication, and the computing unit is a desktop computer, a laptop computer or a terminal server and a single-chip microcomputer 7. When the detection device 100 is fixedly placed in the laboratory, the computing unit can give priority to the desktop computer and the terminal server. When it is necessary to go out for detection, the computing unit gives priority to the laptop computer and the single-chip microcomputer 7. When the computing unit is a single-chip microcomputer 7, the single-chip microcomputer 7 can be fixed on the bracket 3 and connected to the display screen for data calculation and display. The single-chip microcomputer is a prior art and will not be described here.

[0082] Preferably, the longitudinal height between the detection starting point and the detection end point at both ends is 50-100 cm, and the diameter of the glass container 2 is 30-80 cm. The above longitudinal height limitation, on the one hand, effectively ensures that the pipe to be tested has a stable acceleration at the detection end point, and the accuracy of the speed measured at the detection end point; on the other hand, the longitudinal height and the diameter limitation of the glass container 2 make the detection device 100 as a whole meet the detection requirements while having a small overall volume, which is convenient to carry outside, and improves portability and flexibility of use.

[0083] The number of detection points shall not exceed 5. Too many detection points may easily lead to the distance between two adjacent detection points being too close. Although more density values ​​can be obtained, the small change in distance also leads to a small change in speed, resulting in a waste of detection resources. On the other hand, too many detection points require an increase in the number of laser sensors required, which increases equipment costs.

[0084] The detection device 100 also includes a lifting mechanism 6 disposed on the bottom wall of the glass container 2. The lifting mechanism 6 includes a lifting platform 62 and a lifting drive unit. The lifting platform 62 is cross-shaped. The lifting drive unit is an electric telescopic rod 61. The electric telescopic rod 61 has a waterproof performance of IP67 or above. The pipe to be tested that sinks to the bottom of the glass container 2 by itself is lifted upward by the lifting mechanism 6 to facilitate removal, thereby avoiding the use of other auxiliary clamps or manual insertion into the medium liquid to remove the pipe to be tested, which may cause contamination to the medium liquid and increase subsequent measurement errors.

[0085] The clamping mechanism 5 enables the pipe to be tested to start moving from the same position with an initial velocity of zero, thereby ensuring the repeatability and accuracy of the test.

[0086] Specific implementation process:

[0087] When the density of the pipe to be tested is greater than the density of the medium liquid, the pipe to be tested is fixed at the detection starting point at the upper end of the glass container 2 by the clamping mechanism 5 to ensure that the end face of the pipe to be tested is horizontal and the axis of the pipe to be tested is in a vertical state. Then the clamping mechanism 5 is released, and the pipe to be tested starts free fall and passes through the detection starting point and the detection end point in turn. The laser sensor 4 at the detection starting point and the detection end point is used to perform time and speed detection. Since the initial position of the pipe to be tested is flush with the detection starting point, the initial time and the initial speed are both zero. The value measured at the detection end point is the movement time and the final speed. The movement time and the final speed are input into the calculation unit and calculated according to the relationship to obtain the pipe density.

[0088] On the contrary, when the density of the tube to be tested is less than the density of the medium liquid, the tube to be tested is fixed at the detection starting point at the bottom of the glass container 2, and then released. The tube to be tested gradually floats up in the medium liquid and passes through the detection starting point and the detection end point in sequence. The laser sensor 4 measures the movement time and the final speed, and then the calculation unit calculates the tube density.

[0089] The entire embodiment uses the detection device 100 to conveniently and quickly detect the pipe to be tested. Compared with the existing immersion method, there is no need to frequently calibrate and preheat the equipment. Moreover, by automating the measurement speed and time, the possibility of manual intervention is reduced, and the human error introduced by improper operation is reduced. Moreover, compared with expensive equipment such as high-precision electronic balances, the detection device 100 has a low cost and is easy to promote and apply on a large scale.

[0090] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for quickly detecting the density of a pipe, characterized in that: The following steps are involved: Step 1, prepare a detection device, wherein the detection device is provided with a plurality of detection points along the longitudinal direction, wherein any detection point located at the two ends is a detection starting point, and the other detection point is a detection end point, and a medium liquid with a known density is contained in the detection device; Step 2: Fix the cylindrical pipe to be tested on the testing device, and the initial position of the pipe to be tested is flush with the testing starting point; Step 3: The testing device releases the pipe to be tested, and the pipe to be tested moves from the testing starting point to the testing end point in the medium liquid, and the speed and time to reach each testing point are measured; Step 4: The density of the pipe to be measured is obtained according to the speed and time measured in step 3 and the relationship ρ1=f(v, t); when the density of the pipe to be measured is greater than the density of the medium liquid, the relationship is specifically: When the density of the pipe to be tested is less than the density of the medium liquid, the specific relationship is: In the above relationship, v is the instantaneous velocity of the pipe to be tested, t is the time from the pipe to the detection point, ρ1 is the density of the pipe to be tested, ρ2 is the density of the medium liquid, and C d is the drag coefficient, g is the acceleration due to gravity, h is the height of the pipe to be tested, and C3 is a constant.

2. A method for rapidly detecting pipe density according to claim 1, characterized in that: In step 1, when the density of the pipe to be tested is greater than the density of the medium liquid, the detection point located at the top is the detection starting point; when the density of the pipe to be tested is less than the density of the medium liquid, the detection point located at the bottom is the detection starting point.

3. A method for rapidly detecting pipe density according to claim 2, characterized in that: The medium liquid is a small molecule liquid.

4. The method for quickly detecting the density of a pipe according to claim 1, characterized in that: In step 2, when the pipe to be tested is at the initial position, its end surface is in a horizontal state.

5. A method for rapidly detecting pipe density according to claim 4, characterized in that: When the pipe to be tested is at the starting point of the test, t=0, v=0, and according to the boundary conditions, the constant C3=0.

6. A method for quickly detecting pipe density according to any one of claims 1 to 5, characterized in that: The detection device includes a base, on which a cylindrical glass container is fixed, and a clamping mechanism for clamping the pipe to be tested is provided at the opening of the glass container; a bracket is provided on the outer periphery of the glass container, and a laser sensor is provided at each detection point, and the laser sensor includes a transmitter and a receiver, and the transmitter and the receiver are respectively arranged on the brackets on both sides of the glass container; both laser sensors are communicatively connected to the computing unit.

7. A method for rapidly detecting pipe density according to claim 6, characterized in that: The vertical height between the detection starting point and the detection end point is 50-100cm.

8. A method for rapidly detecting pipe density according to claim 7, characterized in that: The diameter of the glass container is 30-80 cm.

9. A method for rapidly detecting pipe density according to claim 8, characterized in that: The detection device also includes a lifting mechanism arranged on the bottom wall of the glass container. The lifting mechanism includes a lifting platform and a lifting drive part. The lifting platform is in a cross shape.

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