A central tube collapse test device and its usage method

Abstract

The present invention relates to a central tube collapse test device and a method for using the same. The test device includes a tank assembly (8) and an upper cover assembly (1) sealingly connected thereto. A central tube specimen (4) to be tested is placed inside the tank assembly (8). By injecting liquid into the tank assembly (8) and combining with a pressure measuring element, the collapse test of the central tube specimen (4) to be tested is carried out. It is characterized in that a locking unit is arranged inside the tank assembly (8), and the central tube specimen (4) to be tested is adjustably fixed inside the tank assembly (8). Compared with the prior art, the present invention is suitable for central tubes of test pieces of various different sizes and specifications, has a simple structure, is convenient to use, and saves costs.

Description

Technical Field

[0001] The present invention relates to a compressive test device for a filter component and a method for using the same, and more particularly to a central tube collapse test device and a method for using the same. Background Art

[0002] Common filter components in the fields of construction machinery and automobiles are liquid filters (fuel and oil filters), oil-gas separators, etc. Circular filter elements of different sizes are widely used. The circular central tube involved is the main part in the filter element that plays a role in strengthening, supporting, and preventing collapse. It is necessary to test the collapse resistance of the filter element component. The existing test is carried out by means of a filter assembly or a filter element assembly. Particulate ash is added to the flowing liquid to cause the accumulation of ash on the surface of the filter paper of the filter element, so that the pressure borne by the central tube supported by it rises. When the force exceeds the bearing capacity of the central tube, it forces the central tube to yield and collapse. The test process requires loading a certain amount of particulate ash, and relevant bypass valves, etc. need to be blocked before the test. The test process of larger-sized filter element test pieces is long, and the assembly or filter element assembly and test auxiliary materials are scrapped at the same time after the test, resulting in high test costs and inability to be reused, long test cycles, and high test costs.

[0003] Patent CN102175437B discloses a buckling test device for a deep-water subsea pipeline, including a pressure chamber composed of a main chamber body, a front end hatch, and a rear end hatch of the chamber body. The front end hatch and the rear end hatch are respectively connected to both ends of the main chamber body. Sealing rings are arranged on the inner sides of the front end hatch and the rear end hatch. A hydraulic press is fixed on the front end hatch. The piston rod of the hydraulic press passes through the front end hatch and extends into the main chamber body. A piston rod flange is arranged at the end of the piston rod. A guide rail is arranged on the upper surface of the bottom of the main chamber body. A trolley for transporting the pipeline test piece is placed on the guide rail. Pipeline end flanges are connected to both ends of the pipeline test piece. The piston rod flange matches the pipeline end flange, and the pipeline end flange at the other end of the pipeline test piece matches the top and bottom flange fixed on the rear end hatch of the chamber body. However, this patent is based on a high-pressure environment, and other conditions are applied to the product for testing (such as buckling test, etc.), with a complex structure and many components, and is not suitable for testing the central tube of a filter. Summary of the Invention

[0004] The purpose of the present invention is to provide a tooling for central tube collapse test and a method for using the same to solve the above problems. Central tubes of different specifications can be fixed in a tank by an adjustable axial locking with a test device of one specification, and a certain sealing and partitioning effect can be achieved between the inner and outer walls of the central tube.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A central tube collapse test device, comprising a tank assembly and an upper cover assembly hermetically connected thereto. A central tube specimen to be tested is placed inside the tank assembly. By injecting liquid into the tank assembly and combining with a pressure measuring element, the collapse test of the central tube specimen to be tested is carried out. It is characterized in that an adjustable locking unit is arranged inside the tank assembly, and the central tube specimen to be tested is fixed inside the tank assembly.

[0007] The locking unit is an axial locking unit, including a core shaft, a locking nut and an end cover mounted on the core shaft. The core shaft is vertically fixed at the bottom of the tank assembly, and its upper part is connected to the upper cover assembly. The end cover is arranged at the upper end of the central tube specimen to be tested and seals it. The locking nut is arranged above the end cover for fastening.

[0008] Further, a bushing for adjusting the axial distance is arranged between the locking nut and the end cover. When carrying out the collapse test, the central tube specimen to be tested and the core shaft are placed in parallel. The lower part of the central tube specimen to be tested is fixed at the bottom of the tank assembly, and the upper part is fixed by the end cover.

[0009] Further, a positioning and fixing member is arranged at the top end of the core shaft, and a fixing member is arranged at the lower end. Further preferably, the top positioning and fixing member is a small thread, and the lower fixing member is an external thread.

[0010] Further, a positioning and fixing member is arranged at the top end of the core shaft, and a fixing member is arranged at the lower end. The lower end of the core shaft is provided with a radial hole and an axial hole. The radial hole communicates with the inside of the tank assembly, and the lower end of the axial hole is provided with a fitting member and communicates with the external atmosphere. The radial hole directly communicates with the inside of the tank assembly. The upper end of the axial hole penetrates through the radial hole, and the lower end is provided with a fitting member which is an internal pipe thread hole for fitting a pipe joint and a drainage hose and communicates with the atmosphere. The two cooperate to be used for communicating the inside of the central tube with the atmospheric pressure or discharging the liquid in the tank.

[0011] Further, the upper cover assembly includes an upper cover and two lifting handles. Circular holes for fixing and sealing are distributed around the periphery and at the center of the upper cover surface. The number of peripheral circular holes is 16, and the number of central circular holes is 1. The diameters are all about 8.5 mm, and they are used for fixing and sealing in cooperation with M8 screws. Another circular hole for installing a test liquid pipe joint and a pipeline and another circular hole for installing a tee pipe fitting and a pressure measuring and air releasing element are also distributed.

[0012] Further, the tank assembly includes two lifting handles, a tank body and a tank base. The lifting handles are arranged on the side wall of the tank body, and the number is 2. The tank body is fixedly connected to the tank base, which is a welded connection to ensure the integrity of the tank assembly and have a certain pressure resistance.

[0013] Furthermore, the tank assembly further includes a top fixing and sealing assembly, reinforcing ribs, and a support portion. The top fixing and sealing assembly connects the upper cover assembly and the tank assembly. The top fixing and sealing assembly includes M8 screws and flanges. The upper cover and the tank are sealed and connected through the sealing member, i.e., the flange seal ring. The reinforcing ribs are provided on the side wall of the tank. The support portion is fixedly connected to the tank base, and 4 M10 nuts can be welded. When necessary, movable rollers or support columns can be installed.

[0014] A method for using a central tube collapse test device, the method comprising the following steps:

[0015] (a) Seal the central tube specimen to be tested and install it in the test device;

[0016] (b) Select a test bench with the required test liquid, and place the test device beside the test bench or above the test liquid tank;

[0017] (c) Connect the corresponding pipelines and open the air release element, and inject the test liquid into the tank assembly;

[0018] (d) Connect and turn on the pressure measuring element, continue to inject the test liquid, and record the maximum value shown by the pressure measuring element, which is the collapse pressure resistance value of the central tube;

[0019] (e) Complete the test, disassemble or replace the new central tube specimen to be tested.

[0020] Furthermore, the test liquid in step (b) is one of engine oil, diesel oil, or water, and the test bench is a collapse or explosion test bench; in step (d), it is necessary to wait until the test liquid overflows from the air release element opening, stop injecting the test liquid, close the air release element, and then continue to inject the test liquid to proceed to the next step.

[0021] More specifically, it includes the following steps: (a) Seal the central tube specimen to be tested, install it in the test device, wrap the central tube on the circular surface with plastic film to prevent liquid surface leakage. At the same time, both ends protrude from the end face of the central tube, and the protruding part of the film is folded inward into the central tube to seal the end face of the central tube. The central tube with the film is installed on the base of the tank. The mandrel has been fixed on the base. Close the upper cover. The grooves of the base and the end cover are referenced to ensure that the central tube is basically concentric. Select a bushing with an appropriate axial length and install it on the mandrel, then screw on the locking nut to fix it. Since the axial lengths of the central tubes are different, the bushings are parts with multiple specifications of lengths. Through the axial compensation of the bushings, the axial meshing of the locking nut is reasonable, and the installation and disassembly are more convenient and fast. There is a flange seal ring at the flange of the tank assembly. Close the upper cover assembly and lock each screw with an M8 nut to seal the tank;

[0022] (b) Select a test bench with the required test liquid, and place the test device beside the test bench or above the test liquid tank;

[0023] (c) Connect the corresponding pipelines. The drain pipe below the mandrel is introduced into the test liquid tank, and the test liquid pipe joint and pipeline on the upper cover assembly are connected to the corresponding output pipe orifice of the test bench. Open the air release element, that is, place the air release element of the three-way pipe fitting on the upper cover assembly in the open state, and manually or automatically start injecting the test liquid into the tank assembly;

[0024] (d) Connect and turn on the pressure measuring element, and manually or automatically continue to inject the test liquid into the tank assembly. Observe that the displayed value of the pressure element will rise. At this time, there should be a pressure difference equivalent to the displayed value on the inner and outer surfaces of the tested center pipe specimen. As the test liquid is continuously injected, the pressure in the tank continues to rise. When the support of the center pipe wall is insufficient to withstand the pressure in the tank, the center pipe wall will undergo a collapse deformation or collapse, causing the inner and outer seals of the center pipe to be damaged. The test liquid will be introduced into the test liquid tank through the lower end hole of the mandrel, and at the same time, the displayed value of the pressure element will instantaneously become smaller. Record the maximum value shown by the pressure measuring element, which is the pressure value of the anti-collapse ability of the test piece;

[0025] (e) Disassemble or replace the new tested center pipe specimen. The disassembly steps are opposite to the installation steps, that is, loosen the M8 nuts respectively, lift the upper cover assembly, loosen the locking nut, take out the bushing, end cover and the tested center pipe specimen, replace the new center pipe test specimen, and continue according to the installation steps.

[0026] The tooling of the present invention is a combination of a container capable of withstanding a certain pressure and having a certain volume and a center screw, and the tested center pipe of the test piece is press-fitted with the end cover by winding several layers of plastic film on the surface. Through the bushing, mandrel and locking nut, it can be applied to center pipe tests of different sizes and specifications. The tooling can be reused, shortening the test cycle, reducing the waste of test piece filter assemblies or filter element assemblies and auxiliary materials, and greatly reducing the test cost.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) One set of device can be applied to circular center pipes of various sizes and specifications;

[0029] (2) Cost savings, fewer test components involved, less waste of auxiliary materials, shorter test time, and good economy;

[0030] (3) The tooling has a basic circular structure, is easy to manufacture, has a low development cost, is simple in structure, quick in disassembly, installation and adjustment, convenient to implement, time-saving and labor-saving;

[0031] (4) The tooling has strong adaptability, is convenient to move, and can use different test media, such as engine oil, diesel oil, and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a center pipe collapse test device;

[0033] Figure 2 is the front view of the upper cover assembly;

[0034] Figure 3 is the top view of the upper cover assembly;

[0035] Figure 4 is the front view of the tank body assembly;

[0036] Figure 5 is the top view of the tank body assembly.

[0037] In the figure: 1 - upper cover assembly; 2 - flange sealing ring; 3 - end cover; 4 - center tube specimen to be measured; 5 - M8 nut; 6 - locking nut; 7 - bushing; 8 - tank body assembly; 9 - mandrel; 1.1 - upper cover; 1.2 - lifting handle ring; 8.1 - M8 screw; 8.2 - flange; 8.3 - lifting handle ring; 8.4 - reinforcing rib; 8.5 - tank body; 8.6 - tank body base; 8.7 - M10 nut. Detailed implementation mode

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment

[0040] As Figure 1 shown, the structural composition of the center tube collapse test device: upper cover assembly 1, flange sealing ring 2, end cover 3, center tube specimen to be measured 4, 17 M8 nuts 5, locking nut 6, bushings 7 (multiple in number, reserved for adjusting the axial distance between the locking nut and the center tube), tank body assembly 8 and mandrel 9. The middle thread at the upper end of the mandrel 9 is used for locking the workpiece, the small thread at the top is used for positioning and fixing, the external thread at the lower end of the mandrel is used for fixing, there are through light holes and axial holes in the radial direction, and the end is provided with an internal pipe thread hole for installing pipe fittings and drainage hoses, which is used to communicate the inside of the center tube with the atmospheric pressure or drain the liquid in the tank. As Figure 2 and Figure 3 shown, the upper cover assembly is composed of an upper cover 1.1 and 2 lifting handle rings 1.2. Round holes with a diameter of about 8.5 mm are distributed around the upper cover surface and at the center. Among them, there are 16 around the periphery and 1 at the center, which are used for fixing and sealing in cooperation with the M8 screw 8.1. One of the two internal pipe thread holes on the upper cover surface is used for installing the test liquid pipe joint and pipeline, and the other is used for installing a three-way pipe fitting and pressure measuring and air releasing elements. The center area of the upper cover surface is treated as a ribbed plate surface. As Figure 4 and Figure 5As shown in the figure, the tank body assembly has 16 M8 screws 8.1, evenly distributed and fixed on the flange 8.2, 2 lifting handles 8.3, reinforcing ribs 8.4, tank body 8.5, and tank body base 8.6. Among them, the tank body 8.5 and the tank body base 8.6 are welded together to ensure the integrity of the tank body assembly and have a certain pressure resistance. 4 M10 nuts 8.7 are welded to the tank body base 8.6.

[0041] Embodiment 2

[0042] A method for using a central tube collapse test device includes the following steps:

[0043] (1) Install the central tube test piece in the test device. Wrap the central tube on the circular surface with plastic film, about 5 layers thick, to prevent liquid surface leakage. At the same time, both ends protrude more than 10 mm from the end face of the central tube. The protruding part of the film is folded into the central tube to seal the end face of the central tube. The central tube with the film is installed on the base of the tank body. The mandrel has been fixed on the base. Close the end cover. The grooves of the base and the end cover are referenced to ensure that the central tube is basically concentric. Install a bushing with an appropriate axial length on the mandrel and screw on the locking nut to fix it. Since the axial lengths of the central tubes are different, the bushings are parts with multiple specifications of lengths. Through the axial compensation of the bushings, the axial meshing of the locking nut is reasonable, and the installation and disassembly are more convenient and fast. There is a flange sealing ring at the flange of the tank body assembly. Close the upper cover assembly and lock each screw with an M8 nut to seal the tank body;

[0044] (2) Select a collapse (burst) test bench for the required test liquid (test liquids: engine oil, diesel oil, water), and place the test device beside the test bench or above the test liquid tank;

[0045] (3) Connect the corresponding pipelines. The drain pipe below the mandrel is introduced into the test liquid tank. The test liquid pipe joint and pipeline on the upper cover assembly are connected to the output pipe orifice of the corresponding test bench. Open the air release element, that is, place the air release element of the three-way pipe fitting on the upper cover assembly in the open state, and manually or automatically start injecting the test liquid into the tank body assembly;

[0046] (4) Wait until the test liquid overflows from the air release element opening, stop injecting the test liquid, close the air release element, connect and open the pressure measuring element, and manually or automatically continue to inject the test liquid into the tank body assembly. Observe that the display value of the pressure element will rise. At this time, there should be a pressure difference equivalent to the display value on the inner and outer surfaces of the tested central tube test piece. As the test liquid is continuously injected, the pressure in the tank body continues to rise. When the support of the central tube wall is insufficient to withstand the pressure in the tank, the central tube wall will undergo a collapse deformation or collapse, causing the inner and outer seals of the central tube to be damaged. The test liquid will be introduced into the test liquid tank through the lower end hole of the mandrel, and at the same time, it will cause the display value of the pressure element to instantaneously become smaller. Record the maximum value shown by the pressure measuring element, which is the pressure value of the anti-collapse ability of the test piece;

[0047] (5) Disassemble or replace with a new central tube test piece. The disassembly steps are the opposite of the installation steps, that is, loosen the M8 nuts respectively, lift the upper cover assembly, loosen the locking nut, take out the bushing, end cover and the central tube test piece to be measured, replace it with a new central tube test piece, and continue according to the installation steps.

[0048] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A method for using a central tube collapse test device, the central tube collapse test device comprising a tank assembly (8) and an upper cover assembly (1) sealingly connected thereto. A central tube specimen (4) for a filter is placed inside the tank assembly (8), and by injecting liquid into the tank assembly (8) and combining with a pressure measuring element, the collapse test of the central tube specimen (4) is carried out. Characterized in that, An adjustable locking unit is provided inside the tank assembly (8), which fixes the central tube specimen (4) to be tested inside the tank assembly (8); The locking unit is an axial locking unit, comprising a mandrel (9), a locking nut (6) and an end cover (3) mounted on the mandrel (9). The mandrel (9) is vertically fixed to the bottom of the tank assembly (8), and its upper part is connected to the upper cover assembly (1). The end cover (3) is arranged at the upper end of the central tube specimen (4) to seal it, and the locking nut (6) is arranged above the end cover (3) for fastening; A bushing (7) for adjusting the axial distance is provided between the locking nut (6) and the end cover (3); The method for using the central tube collapse test device comprises the following steps: (a) Seal the central tube specimen (4) to be tested with a thin film and install it inside the test device; (b) Select a test bench requiring the test liquid, and place the test device beside the test bench or above the test liquid tank; The test liquid is one of engine oil, diesel oil or water (c) Connect the corresponding pipelines and open the air release element to inject the test liquid into the tank assembly (8); (d) Connect and turn on the pressure measuring element, continue to inject the test liquid, and record the maximum value shown by the pressure measuring element, which is the collapse pressure resistance value of the central tube; (e) Complete the test, disassemble or replace the new central tube specimen (4) to be tested.

2. A method for using a central tube collapse test device according to claim 1, Characterized in that, During the collapse test, the central tube specimen (4) to be tested and the mandrel (9) are placed parallel to each other. The lower part of the central tube specimen (4) to be tested is fixed to the bottom of the tank assembly (8), and the upper part is fixed by the end cover (3).

3. A method for using a central tube collapse test device according to claim 1, Characterized in that, A positioning and fixing member is provided at the top end of the mandrel (9), and a fixing member is provided at the lower end. The lower end of the mandrel (9) is provided with a radial hole and an axial hole. The radial hole communicates with the inside of the tank assembly (8), the upper end of the axial hole communicates with the radial hole, and a fitting member is provided at the lower end of the axial hole and communicates with the external atmosphere.

4. A method for using a central tube collapse test device according to claim 1, Characterized in that, The upper cover assembly (1) comprises an upper cover (1.1) and a lifting handle ring (1.2) provided on the upper cover (1.1). Circular holes are distributed around the periphery and at the center of the surface of the upper cover (1.1).

5. A method for using a central tube collapse test device according to claim 1, Characterized in that, The tank assembly (8) includes a lifting handle ring (8.3), a tank body (8.5) and a tank body base (8.6). The lifting handle ring (8.3) is provided on the side wall of the tank body (8.5), and the tank body base (8.6) is fixedly connected to the bottom of the tank body (8.5).

6. The method for using a central tube collapse test device according to claim 5, characterized in that, the tank assembly (8) further includes a top fixed sealing assembly, a reinforcing rib (8.4) and a support portion (8.7). The top fixed sealing assembly connects the upper cover assembly (1) and the tank assembly (8). The reinforcing rib (8.4) is provided on the side wall of the tank body (8.5), and the support portion (8.7) is fixedly connected to the tank body base (8.6).

7. The method for using a central tube collapse test device according to claim 1, characterized in that, the test bench in step (b) is a collapse or explosion test bench; in step (d), it is necessary to wait until the test liquid overflows from the air release element port, stop injecting the test liquid, close the air release element, and then continue to inject the test liquid to proceed to the next step.

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