A method of testing the density of a bellows

Abstract

This invention discloses a method for testing the density of corrugated pipes, with the following specific steps: First, cut the corrugated pipe specimen; second, select a density testing instrument for testing; third, weigh the corrugated pipe specimen in air; fourth, remove air bubbles from the corrugated pipe specimen and immerse it in water; fifth, automatically determine the weight increase; sixth, calculate the weight of the corrugated pipe specimen in its submerged state. The lifting and lowering mechanism of this invention can lower the corrugated pipe specimen, after it has been weighed in air, into distilled water. During the immersion process, the first and second elastic cleaning wires can handle the air bubbles in the grooves of the corrugated pipe specimen, eliminating the need for manual handling. Furthermore, because the lifting and lowering mechanism lowers the corrugated pipe specimen, it ensures that the specimen effectively sinks to the positions of the first and second elastic cleaning wires for treatment.

Description

Technical Field

[0001] This invention relates to the field of plastic density testing technology, and specifically to a method for testing the density of corrugated pipes. Background Technology

[0002] When it is necessary to test the density of plastics, the immersion method is generally used. This involves selecting a portion of the plastic sample, connecting it with a metal wire, weighing the sample in the air under certain temperature conditions, transferring the sample to distilled water or other aqueous solutions of known density for further weighing, and finally calculating the density using relevant density calculation formulas.

[0003] Corrugated pipes are generally made of plastic. When it is necessary to test their density, the immersion method can also be used. Figure 9 The diagram shows a flowchart of an existing method for testing the density of corrugated pipes. Its shortcomings are as follows: When testing the density of plastics using the immersion method, air bubbles on the surface of the plastic are typically removed to avoid errors. However, corrugated pipes have many grooves on their surface, making them prone to air bubbles. The existing method requires immersing the corrugated pipe surface in liquid first, then observing where air bubbles are present, and finally manually removing the air bubbles from the inner and outer walls of the corrugated pipe. This is inconvenient and inefficient. Furthermore, when the density of the corrugated pipe specimen is too low and it floats on the liquid, additional counterweights need to be added. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a method for testing the density of bellows.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for testing the density of corrugated pipes, the specific steps of which are as follows:

[0007] Step 1: Cut the corrugated pipe specimen;

[0008] The second step is to select a density testing instrument for testing: the density testing instrument includes a support base, on which a density tester is installed, and a sliding support assembly and a container filled with distilled water are installed on the density tester; at the same time, a thin metal wire for hanging and cutting corrugated pipe test pieces is prepared.

[0009] Step 3: Weighing the corrugated pipe specimen in the air: Hang the corrugated pipe specimen on the thin metal wire body. The thin metal wire body and the support base are equipped with a lifting and dropping mechanism to connect the thin metal wire body and the lifting and dropping mechanism. Finally, place the corrugated pipe specimen on the sliding support assembly and weigh the corrugated pipe specimen in the current state using a density tester.

[0010] Step 4: De-airing and immersion of the corrugated pipe specimen in water: Control the sliding support assembly to slide away from the corrugated pipe specimen, and lower the filament metal body and the corrugated pipe specimen through the lifting and dropping assembly, immersing them in distilled water. The container is equipped with an air bubble removal mechanism, which automatically removes air bubbles during the settling process of the corrugated pipe specimen, and the lifting and dropping assembly separates from the filament metal body after completion.

[0011] Step 5: Automatic weighting judgment: A cylindrical weight is provided on the thin metal body. If the density of the corrugated pipe specimen is less than that of distilled water, it will float and the cylindrical weight will be automatically released.

[0012] Step 6: Weighing and calculating the corrugated pipe specimen in immersion state: Use a density tester to weigh and calculate the corrugated pipe specimen in distilled water.

[0013] As a further aspect of the present invention: the sliding support assembly is provided with a support slide plate, which supports the corrugated pipe specimen to complete the weighing in the air.

[0014] As a further aspect of the present invention: the lifting and placing mechanism is provided with a crossbar, which is connected to the thin wire metal body and controlled to descend, placing the corrugated pipe specimen into the container.

[0015] As a further aspect of the present invention: the crossbar is equipped with a moving mechanism, which can move after the corrugated pipe specimen has been placed, and detach it from the filament metal body.

[0016] As a further aspect of the present invention: the bubble removal mechanism is provided with a first elastic cleaning wire and a second elastic cleaning wire, which remove bubbles from the inner and outer walls of the corrugated pipe specimen.

[0017] The beneficial effects of this invention are:

[0018] 1. The lifting and dropping mechanism of the present invention can drive the corrugated pipe specimen weighed in the air to sink into distilled water. During the sinking process, the first elastic cleaning wire and the second elastic cleaning wire can be used to deal with the air bubbles in the groove of the corrugated pipe specimen, without the need for manual processing. Since the lifting and dropping mechanism drives the corrugated pipe specimen to sink, it can ensure that the corrugated pipe specimen effectively sinks to the position of the first elastic cleaning wire and the second elastic cleaning wire and is processed.

[0019] 2. After the lifting and launching mechanism of the present invention drives the corrugated pipe specimen to sink into distilled water, if the density of the corrugated pipe specimen is less than that of distilled water and it floats upward, the cylindrical weight can be automatically launched to increase the weight of the thin metal wire connected to the corrugated pipe specimen, ensuring that the corrugated pipe specimen is submerged in distilled water without manual operation.

[0020] 3. The lifting and launching mechanism of the present invention relies on the corrugated telescopic airbag to support the lifting column. When the lifting column presses down on the corrugated telescopic airbag by gravity, the corrugated telescopic airbag gradually releases air. During the air release process, it can still generate a certain supporting force on the lifting column, so that the lifting column can slowly descend, thereby facilitating the slow descent of the corrugated pipe specimen into the distilled water and preventing the corrugated pipe specimen from falling directly into the distilled water. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the process of this invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the density detection instrument in this invention;

[0024] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 This is a top view schematic diagram of the connection between the second elastic cleaning wire and the supporting cylinder in this invention;

[0026] Figure 5 This is a top view schematic diagram of the connection between the second elastic cleaning wire and the connecting ring in this invention;

[0027] Figure 6 yes Figure 2 Enlarged structural diagram at point B;

[0028] Figure 7 yes Figure 2 Enlarged structural diagram at point C;

[0029] Figure 8 This is a schematic diagram of the left-side structure of the connection between the filament metal body and the crossbar in this invention;

[0030] Figure 9 This is a flowchart illustrating the existing methods for testing the density of corrugated pipes.

[0031] In the diagram: 1. Support base; 2. Density tester; 3. First drive motor; 4. Linkage plate; 5. Rotating arm; 6. Support slide plate; 7. Support sleeve; 8. Container; 9. Electric telescopic rod; 10. Second drive motor; 11. Winding column; 12. Second pressure sensor switch; 13. First pressure sensor switch; 14. Elastic rubber ball; 15. Vibrator; 16. Traction rope; 17. Crossbar; 18. Exhaust pipe end; 19. First connecting guide rail; 20. 21. Rubber sealing block; 22. Support cylinder; 23. Connecting ring; 24. First elastic cleaning wire; 25. Second elastic cleaning wire; 26. Corrugated telescopic airbag; 27. Lifting column; 28. First linkage rod; 29. ​​Second linkage rod; 30. Second connecting guide rail; 31. Corrugated pipe specimen; 32. Cylindrical weight; 33. Insert rod; 34. Insertion hole; 35. Third pressure sensing switch; 36. Collar; 37. Slide carriage; 38. Fine wire metal body; 39. Hook claw. Detailed Implementation

[0032] 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.

[0033] like Figure 9 As shown, the existing method for testing the density of corrugated pipes uses the immersion method, and the specific steps are as follows:

[0034] Step 1: Cut the corrugated pipe sample: Cut an appropriate amount of corrugated pipe as a sample, and place the corrugated pipe sample on the prepared metal wire. The diameter of the metal wire should not be greater than 0.5 mm.

[0035] Step 2: Weighing the corrugated pipe sample in the air: Weigh the corrugated pipe sample and the metal wire in the air using a professional density testing and weighing instrument.

[0036] Step 3: Transfer the corrugated pipe sample to be immersed in distilled water. If the corrugated pipe sample with a density less than that of distilled water cannot be immersed in distilled water, a weight is added to the metal wire to make the corrugated pipe sample sink into the distilled water.

[0037] Step 4: Manual removal of air bubbles from the corrugated tube sample: The corrugated tube sample in distilled water is moved by a metal wire, and the inner and outer walls of the corrugated tube sample are brushed to remove air bubbles and avoid errors.

[0038] Step 5: Weighing under immersion: Weigh the beaker containing the corrugated tube sample from step 3 using a professional density testing and weighing instrument. The instrument temperature is maintained at around 23 degrees Celsius during the weighing process. Finally, the density of the corrugated tube sample is automatically calculated by the professional density testing and weighing instrument based on the previous and subsequent weighings and relevant constant values.

[0039] like Figures 1-8 As shown, a method for testing the density of a corrugated pipe includes the following specific steps:

[0040] Step 1: Cutting corrugated pipe specimen 30: Cut an appropriate amount of corrugated pipe material for use as a specimen;

[0041] Step 2: Selecting a density testing instrument for testing: Prepare the density testing instrument used in the immersion method. The density testing instrument includes a support base 1, on which a density tester 2 is mounted. The density tester 2 is an existing AU-120S model, capable of weighing samples under different conditions and calculating the density based on the weighing data and relevant set values ​​using a set algorithm. The density tester 2 is equipped with a weighing platform and a temperature controller. The temperature controller is used to maintain the test environment temperature at a set temperature, approximately 23 degrees Celsius. A container 8 containing distilled water is placed on the weighing platform of the density tester 2. The density of the distilled water is known. A sliding support assembly is also provided on the weighing platform of the density tester 2. The sliding support assembly includes a support sleeve 7 and a support slide plate 6. There are two support sleeves 7. The two support sleeves 7 are fixedly connected to both sides of the weighing platform of the density tester 2. Supporting slide plates 6 are slidably inserted on both support sleeves 7. The two supporting slide plates 6 are spliced ​​together to facilitate the placement of the corrugated pipe specimen 30. The ends of the two supporting slide plates 6 away from the container 8 are vertically fixedly connected to the linkage plates 4. Two first drive motors 3 are installed in pairs on the support base 1 through brackets. The main shaft ends of the first drive motors 3 are fixedly connected to the rotating arms 5 that cooperate with the corresponding linkage plates 4. When it is necessary for the corrugated pipe specimen 30 placed on the supporting slide plate 6 to fall into the container 8, the two first drive motors 3 are controlled to drive the rotating arms 5 to rotate and squeeze the corresponding linkage plates 4. Then the linkage plates 4 drive the corresponding supporting slide plate 6 to slide. In this way, the two supporting slide plates 6 slide apart to facilitate the corrugated pipe specimen 30 falling into the container 8.

[0042] The density tester 2 is also equipped with a thin metal filament body 37. The bottom end of the thin metal filament body 37 is provided with a hook 38, which facilitates insertion into the inner wall groove of the corrugated tube specimen 30. A lifting and launching mechanism is provided between the thin metal filament body 37 and the support base 1. The lifting and launching mechanism includes a first connecting guide rail 19 and a crossbar 17. The first connecting guide rail 19 is vertically fixed to the support base 1. A lifting column 26 is vertically slidably connected to the first connecting guide rail 19. A corrugated telescopic airbag 25 is vertically connected to the bottom end of the lifting column 26. A linkage exhaust mechanism is provided at the bottom end of the corrugated telescopic airbag 25. The linkage exhaust mechanism includes an exhaust pipe end 18, which is fixedly connected between the bottom end of the corrugated telescopic airbag 25 and the support base 1. The exhaust pipe end 18 and the corrugated telescopic airbag 25 are in communication. Furthermore, the exhaust pipe end 18 is in a horizontal position, and a rubber sealing block 20 is fitted at the port of the exhaust pipe end 18. The rubber sealing block 20 is provided with a linkage mechanism that cooperates with the corresponding linkage plate 4. The linkage mechanism includes a second connecting guide rail 29, which is vertically connected to the top side of the first connecting guide rail 19. A slide 36 is slidably connected to the second connecting guide rail 29, and the end of the slide 36 is connected to the rubber sealing block 20. The bottom end of the second connecting guide rail 29 is movably connected to the first linkage rod 27 through a hinge. A second linkage rod 28 is movably connected to the slide 36 through a hinge. The ends of the first linkage rod 27 and the second linkage rod 28 are movably connected together through a hinge, and the ends of the first linkage rod 27 and the second linkage rod 28 that are connected to each other are aligned with the corresponding linkage plate 4.

[0043] A horizontal bar 17 slides horizontally through the top of the lifting column 26. A collar 35, which mates with the horizontal bar 17, is provided at the top of the filament metal body 37, allowing connection between the filament metal body 37 and the horizontal bar 17. The inner diameter of the collar 35 is larger than the diameter of the horizontal bar 17. A moving mechanism is provided on the horizontal bar 17, including a second drive motor 10. The second drive motor 10 is fixedly connected to the lifting column 26 near the top. A winding column 11 is fixedly connected to the main shaft end of the second drive motor 10, and a traction rope 16 is wound around the winding column 11. The end of 16 is connected to the crossbar 17. An elastic rubber ball 14 is fixedly connected to the side of the lifting column 26 near the bottom. A first pressure sensing switch 13, which is longitudinally aligned with the elastic rubber ball 14, is fixedly connected to the first connecting guide rail 19. The first pressure sensing switch 13 is electrically connected to the second drive motor 10. At the same time, when the corrugated telescopic airbag 25 is filled with air and supports the lifting column 26, the distance between the elastic rubber ball 14 and the first pressure sensing switch 13 is greater than the distance between the upper end surface of the support slide plate 6 and the surface of the distilled water in the container 8.

[0044] A bubble removal mechanism is provided inside container 8, which includes a first elastic cleaning wire 23 and a second elastic cleaning wire 24. A connecting ring 22 is fixedly connected to the middle of the inner side of container 8. The first elastic cleaning wire 23 is connected to the inner ring of the connecting ring 22. A supporting cylinder 21 is also vertically fixedly connected to the middle of the inner side of container 8. The second elastic cleaning wire 24 is connected to the top of the supporting cylinder 21. Multiple first elastic cleaning wires 23 and second elastic cleaning wires 24 are densely distributed circumferentially. The inner diameter of the corrugated pipe specimen 30 is less than the sum of the lengths of two second elastic cleaning wires 24, but greater than the distance between two aligned first elastic cleaning wires 23. The distance between the cleaning wire 23 and the bottom of the container 8 is less than the height of the hook 38. A vibrator 15 is fixedly connected to the end of the crossbar 17 away from the container 8. A second pressure sensing switch 12 corresponding to the elastic rubber ball 14 is fixedly connected to the first connecting guide rail 19 through the rod body. The second pressure sensing switch 12 is electrically connected to the vibrator 15. The pressure sensing end of the second pressure sensing switch 12 is in a vertical position, and the elastic rubber ball 14 can squeeze the pressure sensing end of the second pressure sensing switch 12 when it moves longitudinally. The distance between the elastic rubber ball 14 and the second pressure sensing switch 12 is equal to the distance between the upper surface of the support slide plate 6 and the first elastic cleaning wire 23.

[0045] A cylindrical weight 31 is slidably mounted on the filament metal body 37. The mass of the cylindrical weight 31 is known, and the inner diameter of the cylindrical weight 31 is larger than the diameter of the filament metal body 37. A fixed suspension mechanism is provided between the cylindrical weight 31 and the support base 1. The fixed suspension mechanism includes an electric telescopic rod 9, which is horizontally fixedly connected to the support base 1 via a rod body. An insertion rod 32 is horizontally fixedly connected to the telescopic end of the electric telescopic rod 9. An insertion hole 33 is provided on the cylindrical weight 31, and the insertion rod 32 is inserted into the insertion hole 33. A third pressure sensing switch 34, which is electrically connected to the electric telescopic rod 9, is fixedly connected to the top of the lifting column 26 via a rod body. The third pressure sensing switch 34 is located at the top of the filament metal body 37.

[0046] Step 3: Weighing the corrugated pipe specimen 30 in air: Insert the hook 38 on the thin wire metal body 37 into the corrugated groove on the inside of the corrugated pipe specimen 30 to achieve docking, and make the collar 35 on the top of the thin wire metal body 37 fit on the crossbar 17 in the lifting and placing mechanism, thus completing the connection between the thin wire metal body 37 and the lifting and placing mechanism. Then, place the corrugated pipe specimen 30 on the docking position of the two support slide plates 6 in the sliding support assembly, and make the cylindrical weight 31 sliding on the thin wire metal body 37 dock with the insertion rod 32 through the insertion hole 33. Make sure that there is no contact between the collar 35 on the top of the thin wire metal body 37 and the crossbar 17, and there is also no contact between the cylindrical weight 31 and the thin wire metal body 37 to avoid affecting the weighing results. Then, use the density tester 2 to weigh the corrugated pipe specimen 30 in the air and automatically record the data.

[0047] Step 4: De-airing and immersion of the corrugated pipe specimen 30 in water: The first drive motors 3 on both sides are activated, causing the rotating arm 5 to rotate and press the corresponding linkage plate 4. The linkage plate 4 then causes the corresponding support slide plate 6 to slide, thus separating the two support slide plates 6. This achieves the sliding support assembly detaching from the corrugated pipe specimen 30. When the support slide plate 6 separates from the corrugated pipe specimen 30, because the corrugated pipe specimen 30 is connected to the filament metal body 37, and the collar 35 at the top of the filament metal body 37 is fitted onto the crossbar 17, the corrugated pipe specimen 30 cannot directly fall into the distilled water in the container 8. After the support slide plates 6 slide apart, the linkage plate 4 on one side of the support slide plate 6 presses... Pressing down on the ends where the first linkage 27 and the second linkage 28 connect, causing the first linkage 27 and the second linkage 28 to open, the second linkage 28 pushes the slide 36 to slide upward along the second connecting guide rail 29. During this process, the slide 36 drives the rubber sealing block 20 to slide upward, causing the exhaust pipe end 18 to open. Then, the lifting column 26 slides down along the first connecting guide rail 19 under gravity. During the descent, it compresses the corrugated telescopic airbag 25, and the air inside the corrugated telescopic airbag 25 is discharged from the exhaust pipe end 18. Since the corrugated telescopic airbag 25 also generates a reaction force on the lifting column 26, the lifting column 26 can descend slowly. During the descent of the lifting column 26, it passes through the crossbar 17. The engagement of the collar 35 allows the filament metal body 37 and the bellows specimen 30 to descend slowly. During this process, regardless of whether the density of the bellows specimen 30 is less than the density of distilled water, the crossbar 17 can lower the bellows specimen 30 to the bottom of the container 8 via the collar 35, immersing it in distilled water. This achieves the descent of the filament metal body 37 and the bellows specimen 30 via the lifting and lowering assembly. When the bellows specimen 30 descends to the position of the second elastic cleaning wire 24, the densely distributed second elastic cleaning wires 24 are squeezed into the inner side of the bellows specimen 30, while the densely distributed first elastic cleaning wires 23 are squeezed and adhered to the outer wall of the bellows specimen 30. During the descent of the bellows specimen 30, the cleaning wires... The outer wall is scraped to remove air bubbles. At the same time, when the lifting column 26 lowers the corrugated tube specimen 30 to the position of the second elastic cleaning wire 24, the elastic rubber ball 14 on the lifting column 26 is pressed against the second pressure sensing switch 12. The second pressure sensing switch 12 then activates the vibrator 15, which causes the crossbar 17 to vibrate. In this way, the crossbar 17 transmits the vibration to the thin wire metal body 37, and finally acts on the corrugated tube specimen 30, which facilitates the vibration of the corrugated tube specimen 30 and enhances the scraping degree between it and the first elastic cleaning wire 23 and the second elastic cleaning wire 24, so as to fully remove air bubbles and facilitate accurate weighing in distilled water, that is, the air bubble removal mechanism automatically removes air bubbles.When the lifting column 26 descends to the bottom and stops, the elastic rubber ball 14 connected to it contacts the first pressure sensing switch 13. The first pressure sensing switch 13 then causes the second drive motor 10 to run. The second drive motor 10 drives the winding column 11 to rotate and wind the traction rope 16. The traction rope 16 then pulls the crossbar 17 to move laterally, realizing automatic disengagement from the collar 35, avoiding affecting the weighing of the corrugated pipe specimen 30, thus completing the separation of the lifting and dropping component from the filament metal body 37.

[0048] Step 5: Automatic weighting judgment: When the crossbar 17 disengages from the collar 35, if the density of the corrugated pipe specimen 30 is less than the density of distilled water, the corrugated pipe specimen 30 will float upwards. At this time, the thin wire metal body 37 will also rise upwards. When it rises, it will touch the third pressure sensing switch 34, which will then generate a sense and cause the electric telescopic rod 9 to retract. In this way, the insertion rod 32 will move laterally and disengage from the insertion hole 33 on the cylindrical weight 31. Then, the cylindrical weight 31 will fall down along the thin wire metal body 37 and press on the hook 38, realizing automatic deployment and weighting of the corrugated pipe specimen 30 to keep it submerged in distilled water without manual operation for weighting.

[0049] Step 6: Weighing and calculating the corrugated pipe specimen 30 in its submerged state: After the corrugated pipe specimen 30 is completely submerged in the distilled water in container 8, the density tester 2 is used to weigh it, and the weight is calculated according to the set formula:

[0050]

[0051] in:

[0052] ρ S Density of the corrugated pipe specimen at 23℃ or 30℃, in grams per cubic centimeter;

[0053] mS.A: Mass of the bellows specimen 30 in air, in grams;

[0054] mS.IL: Apparent mass of corrugated pipe specimen 30 in distilled water impregnation solution, in grams;

[0055] ρ IL : The density of distilled water in the impregnation solution at 23℃, expressed in grams per cubic centimeter.

[0056] If a cylindrical weight 31 is added for calculation, the following formula is used:

[0057]

[0058] in:

[0059] mk.IL: Apparent weight of cylindrical mass 31 in distilled water, in grams;

[0060] msk.IL: Apparent weight of the bellows specimen 30 and the cylindrical weight 31 together in distilled water, in grams.

[0061] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method of testing the density of a corrugated pipe, characterized by, The specific steps are as follows: Step 1: Cut the corrugated pipe specimen (30); The second step is to select a density testing instrument for testing: the density testing instrument includes a support base (1), a density tester (2) is set on the support base (1), a sliding support assembly and a container (8) filled with distilled water are installed on the density tester (2); at the same time, a thin metal wire (37) is prepared for hanging and placing the cut corrugated pipe test piece (30). Step 3: Weighing the corrugated pipe specimen (30) in the air: The bottom end of the filament metal body (37) is provided with a hook (38), which is used to insert into the groove of the inner wall of the corrugated pipe specimen (30) to complete the hanging of the corrugated pipe specimen (30). The filament metal body (37) and the support base (1) are provided with a lifting and dropping mechanism to connect the filament metal body (37) and the lifting and dropping mechanism. Finally, the corrugated pipe specimen (30) is placed on the sliding support assembly and the density tester (2) is used to weigh the corrugated pipe specimen (30) in the current state. Step 4: De-airing and immersion of the corrugated pipe specimen (30) in water: Control the sliding support assembly to slide away from the corrugated pipe specimen (30), and lower the fine wire metal body (37) and the corrugated pipe specimen (30) through the lifting and lowering assembly, immersing them in distilled water. The container (8) is equipped with an air-air removal mechanism, which includes a first elastic cleaning wire (23) and a second elastic cleaning wire (24). A connecting ring (22) is fixedly connected to the middle position of the inner side of the container (8). The first elastic cleaning wire (23) is connected to the inner ring of the connecting ring (22). The container (8) A support cylinder (21) is vertically fixed in the middle of the inner side. The second elastic cleaning wire (24) is connected to the top of the support cylinder (21). The first elastic cleaning wire (23) and the second elastic cleaning wire (24) are densely distributed in the circumference. During the settling process of the corrugated pipe specimen (30), the first elastic cleaning wire (23) scrapes the outer wall of the corrugated pipe specimen (30), and the second elastic cleaning wire (24) scrapes the inner wall of the corrugated pipe specimen (30) to remove air bubbles automatically and synchronously from the inner and outer walls. After completion, the lifting and dropping component separates from the filament metal body (37). Step 5, Automatic Weighting Judgment: A cylindrical weight (31) is mounted on the thin metal body (37). A fixed suspension mechanism is provided between the cylindrical weight (31) and the support base (1). The fixed suspension mechanism includes an electric telescopic rod (9), which is horizontally fixedly connected to the support base (1). An insertion rod (32) is horizontally fixedly connected to the telescopic end of the electric telescopic rod (9). An insertion hole (33) is provided on the cylindrical weight (31), and the insertion rod (32) is inserted into the insertion hole (33). A third pressure sensing switch (34) electrically connected to the electric telescopic rod (9) is provided above the wire metal body (37); if the density of the corrugated pipe specimen (30) is less than the density of distilled water, the corrugated pipe specimen (30) floats upward. At this time, the wire metal body (37) rises synchronously and touches the third pressure sensing switch (34). The third pressure sensing switch (34) generates a sense, causing the electric telescopic rod (9) to retract, driving the insertion rod (32) to detach from the cylindrical weight (31), thereby realizing the automatic deployment of the cylindrical weight (31); Step 6: Weighing and calculating the corrugated pipe specimen (30) in the immersion state: Use the density tester (2) to weigh and calculate the corrugated pipe specimen (30) in distilled water.

2. A method of testing the density of a bellows according to claim 1, characterized in that, The sliding support assembly is provided with a support plate (6), which supports the corrugated pipe specimen (30) to complete the weighing in the air.

3. A method of testing the density of a bellows as defined in claim 1, characterized in that The lifting and dropping mechanism is equipped with a crossbar (17), which is connected to the filament metal body (37) and controls the crossbar (17) to descend, dropping the corrugated pipe specimen (30) into the container (8).

4. A method of testing the density of a bellows according to claim 3, characterized in that, The crossbar (17) is equipped with a moving mechanism, which can move after the corrugated pipe specimen (30) is placed, and detach it from the filament metal body (37).

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