A pressure test device and method for detecting the sealing performance of an electric heating pipe

Abstract

The present invention discloses a pressure test device and method for detecting the sealing performance of electric heating tubes in the field of electric heating tubes, comprising a fuselage, a rear machine base and a fixing block are arranged on the fuselage, the fixing block and the rear machine base are arranged opposite to each other, two ends of the fixing block are respectively connected to a fixing column, a hydraulic oil cylinder is arranged on the rear machine base, an end of the hydraulic oil cylinder is connected to a fastening tool, a baffle block is arranged on a surface of the fixing column opposite to the rear machine base, one end of the baffle block is located on the inner side of the fuselage and extends out of the fixing column, a placement block is arranged directly below the baffle blocks, the placement block is arranged on the fixing block and is eccentrically arranged with the fastening tool; by extrusion, the pipe hole on the flange can shrink inwardly under the action of pressure, tightly sheathing and biting the electric heating tube, avoiding the problem of loose welding, and the connection between the electric heating tube and the flange is not easily corroded. The present invention is used for fixing the electric heating tube and the flange.

Description

Technical Field

[0001] The invention relates to an electric heating tube testing device and method. Background Art

[0002] In the prior art, in order to determine the tightness between the tube body and the flange of the electric heating tube, a water pressure test is required for the electric heating tube. Insert the electric heating tube into a closed cavity and press the flange, soak the other side of the flange in water, and then introduce a certain pressure of gas into the cavity. By observing whether there are bubbles overflowing from the flange welding position on the side soaked in water, the tightness between the tube body and the flange can be determined. However, when there is a slight leak in the product, bubbles may not be generated or the bubbles generated are very small and are not easily detected by the naked eye, especially after long-term observation, eye fatigue, and it is more likely to misjudge the product, resulting in the product being put on the market with potential safety hazards. Therefore, the detection device and method have the problem of inaccurate detection. Summary of the invention

[0003] The object of the present invention is to provide a pressure test device and method for detecting the sealing of an electric heating tube, which can accurately detect whether the electric heating tube has a sealing problem and avoid misjudgment of the product.

[0004] To achieve the above-mentioned purpose, the present invention provides a pressure test device for detecting the sealing of an electric heating tube, comprising a base, a bracket being arranged on the base, a rotating mechanism being arranged on the bracket, a pressure test container being arranged on the rotating mechanism, a pressurizing structure being arranged at the tail of the pressure test container, an insertion port being arranged at the top of the pressure test container, and an inner diameter of the container being larger than an outer diameter of the electric heating tube.

[0005] Compared with the prior art, the beneficial effect of the present invention lies in that the pressure test container is in a vertical state, the pressurizing structure is closed, water is poured from the insertion port, and then the electric heating tube under test is sent into the pressure test container through the insertion port, the flange and the end of the electric heating tube are exposed outside the insertion port, the pressure test container is tilted by the rotating mechanism, the height of the insertion port is lower than the tail of the pressure test container, the pressurizing structure pressurizes the pressure test container, and maintains the pressure for a certain period of time. If water stains appear between the body of the electric heating tube and the flange, it must indicate that the seal between the body of the electric heating tube and the flange is not tight, and the entire body of the electric heating tube is soaked due to the tilted placement inside the pressure test tube. , under the action of pressure and gravity, even if there is a slight leak between the electric heating tube body and the flange, there will still be a trace of water stains seeping out, which can be felt by touching it with your hand. Even if your eyes become tired after a long period of detection, you can still accurately detect whether the electric heating tube has a sealing problem. The invention includes a base, a bracket is provided on the base, a rotating mechanism is provided on the bracket, a pressure test container is provided on the rotating mechanism, a pressurizing structure is provided at the tail of the pressure test container, an insertion port is provided at the top of the pressure test container, and the inner diameter of the container is larger than the outer diameter of the electric heating tube. The present invention is used for sealing detection of electric heating tubes and .

[0006] As a further improvement of the present invention, the bracket includes a column one and a column two respectively arranged on both sides of the base, the height of the column one is greater than that of the column two, the column one is connected to the base via a reinforcing rod, and the rotating mechanism is arranged on the upper part of the column one, so that after the pressure test container is rotated, one end is connected to the rotating mechanism arranged on the upper part of the column one, and the other end is placed on the column two. The pressure test container is placed at an angle, and the height of its insertion port is lower than the tail. At the same time, the end of the electric heating tube extending out of the pressure test container is suspended in the air to avoid collision with the base or the workbench during the rotation of the pressure test container, which may cause damage to the product.

[0007] As a further improvement of the present invention, the rotating mechanism includes a rotating shaft, which is arranged at the upper part of column one. A container sleeve is sleeved on the rotating shaft, and the pressure test container is inserted into the container sleeve. In this way, the rotating shaft rotates, driving the container sleeve to rotate, and then the pressure test container rotates, which can conveniently change the placement state of the pressure test container.

[0008] As a further improvement of the present invention, the pressurizing structure includes a vent pipe, the upper end of the vent pipe is inserted into the tail of the pressure test container, the lower end of the vent pipe is provided with an air inlet, the air inlet is connected to the air inlet pipe via an air inlet valve, and the middle part of the vent pipe is provided with an air outlet, the air outlet is connected to the air outlet pipe via an exhaust valve. In this way, before the test, the exhaust valve and the air inlet valve are closed first to make the bottom of the pressure test container airtight. After the pressure test container is inserted into the electric heating tube to be tested, it is placed at an angle, and then the air inlet valve is opened for pressurization. After the test is completed, the air inlet valve is closed and the exhaust valve is opened for decompression until the pressure in the pressure test container is completely discharged. The operation is convenient and controllable.

[0009] As a further improvement of the present invention, a soft pad is provided on the top of the second column, so that when the pressure test container is tilted, the remaining soft pads are in contact, avoiding hard contact with the second column, which would cause damage to the pressure test container.

[0010] As a further improvement of the present invention, the insertion port is provided with a flange 1, and the flange 1 matches the flange 2 of the electric heating tube. The upper surface of the flange 1 is provided with a sealing gasket, so that a good seal can be ensured between the flange 1 of the insertion port and the flange 2 of the electric heating tube to be tested. After the pressure test container is pressurized, water therein will not seep out from between the flange 1 and the flange 2, thereby improving the detection accuracy.

[0011] To achieve the above object, the present invention also provides a pressure test method for detecting the sealing performance of an electric heating tube, and the specific steps are as follows:

[0012] Step 1, insert both ends of the electric heating tube into the tube holes on the flange and extend the ends;

[0013] Step 2: Place the flange with the electric heating tube inserted close to the spacer block, with the front end of the electric heating tube placed on the U-shaped groove and the semi-arc groove, and the rear end of the electric heating tube placed on the arc groove;

[0014] Step 3, start the hydraulic cylinder so that the end of the hydraulic cylinder pushes the fastening tool to move toward the end of the electric heating tube extending out of the flange;

[0015] Step 4, the truncated table cutter head of the fastening tool wraps the end of the electric heating tube extending out of the flange and continues to squeeze the outer periphery of the tube hole on the flange driven by the hydraulic cylinder;

[0016] Step 5: When the truncated table cutter head of the fastening tool penetrates into the flange to a set depth, the hydraulic cylinder begins to retract, and the truncated table cutter exits the flange;

[0017] Step 6, rotate the flange so that the end of the next electric heating tube to be tightened is aligned with the round table cutter head of the tightening tool;

[0018] Step 7, repeat steps 3-6 until the ends of the electric heating tubes on the same circumference of the flange are all tightened.

[0019] Step 1, rotating the pressure test container so that the pressure test container is in a vertical state, and the exhaust valve and the intake valve are both closed;

[0020] Step 2, adding water into the pressure test container from the insertion port of the pressure test container, leaving a distance between the water surface and the insertion port of the pressure test container;

[0021] Step 3, insert the electric heating tube to be tested into the pressure test container from the flange one at the insertion port, and fix the flange one and the flange two together;

[0022] Step 4, rotating the pressure test container so that the pressure test container is placed on the second column and is in an inclined state, and the height of the insertion port of the pressure test container is lower than the height of the rotating shaft;

[0023] Step 5, the air inlet pipe is connected to the pressurizing device, and the air inlet valve is opened so that the pressure inside the pressure test container reaches the set 1.2 MPa;

[0024] Step 6, after a period of pressure holding time, observe whether there is water seepage at the joint between the outer wall of the electric heating tube to be tested and the second flange;

[0025] Step 7, close the air inlet valve, open the exhaust valve, and close the exhaust valve after there is no pressure inside the pressure test container.

[0026] Step 8, restore the pressure test container to a vertical state, remove the electric heating tubes, and place them according to the test results.

[0027] In this way, the sealing of the electric heating tube can be accurately tested to avoid misjudgment.

[0028] As a further feature of the present invention, the pressure holding time is 5-10 seconds, which can ensure that whether the electric heating tube has a poor sealing problem can be accurately tested within a limited time, thereby improving the detection efficiency.

[0029] As a further feature of the present invention, the water level of the pressure test container in an inclined state is not lower than the height of the rotating shaft, so that the water can completely immerse the tube body of the electric heating tube to be tested. At the same time, the water pressure is relatively large after pressurization, which can more accurately detect the sealing performance.

[0030] As a further step of the present invention, in step 6, an insulation resistance tester is also required to detect the insulation resistance value between the conductive part of the electric heating tube and the shell, so that insulation detection can be added to the process of detecting sealing, reducing the detection process and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the reset state structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the detection state structure of the present invention.

[0033] Among them, 1 is a cushion, 2 is a second column, 3 is a reinforcing rod, 4 is a base, 5 is a first column, 6 is a vent pipe, 7 is an air inlet, 8 is an air inlet valve, 9 is a second flange, 10 is a first flange, 11 is an electric heating tube, 12 is a pressure test container, 13 is a rotating shaft, 14 is a container sleeve, 15 is an air outlet, 16 is an exhaust valve, 17 is an air outlet pipe, and 18 is an air inlet pipe. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings:

[0035] like Figure 1-2A pressure test device for detecting the sealing property of an electric heating pipe shown in the figure comprises a base 4, a bracket is arranged on the base 4, a rotating mechanism is arranged on the bracket, a pressure test container 12 is arranged on the rotating mechanism, a pressurizing structure is arranged at the tail of the pressure test container 12, an insertion port is arranged on the top of the pressure test container 12, and the inner diameter of the container is larger than the outer diameter of the electric heating pipe; the bracket comprises a column 1 5 and a column 2 1 respectively arranged on both sides of the base 4, the height of the column 1 5 is larger than the column 2 1, the column 1 5 is connected to the base 4 via a reinforcing rod 3, and the rotating mechanism is arranged on the upper part of the column 1 5; the rotating mechanism comprises a rotating shaft, and the rotating shaft is arranged on the column 1 At the upper part of column 15, a container sleeve 14 is sleeved on the rotating shaft, and the pressure test container 12 is inserted into the container sleeve 14; the pressurization structure includes a vent pipe 6, the upper end of the vent pipe 6 is inserted into the tail of the pressure test container 12, the lower end of the vent pipe 6 is provided with an air inlet 7, the air inlet 7 is connected to the air inlet pipe 18 via an air inlet valve 8, and an air outlet 15 is opened in the middle of the vent pipe 6, and the air outlet 15 is connected to the air outlet pipe 17 via an exhaust valve 16; a cushion 2 is provided on the top of column 2 1; a flange 10 is provided on the insertion port, and the flange 10 matches the flange 2 9 of the electric heating tube, and a sealing gasket is provided on the upper surface of the flange 10.

[0036] like Figure 1-2 A pressure test method for detecting the sealing performance of an electric heating tube is shown, and the specific steps are as follows:

[0037] Step 1, rotating the pressure test container 12 so that the pressure test container 12 is in a vertical state, and the exhaust valve 16 and the intake valve 8 are both closed;

[0038] Step 2, adding water into the pressure test container 12 from the insertion port of the pressure test container 12, leaving a distance between the water surface and the insertion port of the pressure test container 12;

[0039] Step 3, insert the electric heating tube to be tested into the pressure test container 12 from the flange 10 at the insertion port, and fix the flange 10 and the flange 2 9 together;

[0040] Step 4, rotating the pressure test container 12 so that the pressure test container 12 is placed on the column 2 1 and is in an inclined state, and the height of the insertion port of the pressure test container 12 is lower than the height of the rotating shaft, and the water surface height of the pressure test container 12 in the inclined state is not lower than the height of the rotating shaft 13;

[0041] Step 5, the air inlet pipe 18 is connected to the pressurizing device, and the air inlet valve 8 is opened so that the pressure inside the pressure test container 12 reaches the set pressure of 1.2 MPa;

[0042] Step 6, after 5-10 seconds of pressure holding time, observe whether there is water seepage at the joint between the outer wall of the electric heating tube to be tested and the flange 29, and then use an insulation resistance tester to detect the insulation resistance value between the conductive part of the electric heating tube and the shell;

[0043] Step 7, close the air inlet valve 8, open the exhaust valve 16, and close the exhaust valve 16 after the pressure test container 12 is free of pressure;

[0044] Step 8, restore the pressure test container 12 to a vertical state, remove the electric heating tubes, and place them according to the test results.

[0045] In the present invention, the purpose of the pressure test is to observe whether there is water leakage at the joint between the outer wall of the electric heating tube to be tested and the flange 9, and to detect whether there are sand holes or air holes on the surface of the component.

[0046] When the pressure test container 12 is in a vertical state and there is no pressure inside, it is called a reset state. At this time, the exhaust valve 16 and the air inlet valve 8 are in a closed state. Water for testing is poured into the insertion port of the pressure test container 12. At this time, the electric heating tube 11 can be regarded as being in a working state, wherein a sealing gasket is added at the joint between the flange 10 and the flange 2 9 to ensure the sealing of the joint between the electric heating tube 11 and the pressure test container 12. Before the pressure test, there is a certain gap between the electric heating tube and the inner wall of the water pressure container.

[0047] The pressure test container 12 is rotated to be in an inclined state. The pressure test container 12 is in an inclined state, which is called a pressure test state, wherein the horizontal height of the insertion port of the pressure test container 12 is lower than the horizontal height of the rotating shaft 13. The air inlet valve 8 is opened to make the inside of the pressure test container 12 reach the test requirement of 1.2MPa, and the pressure test state ensures that the test time is 5 to 10 seconds. Observe whether there is water leakage at the joint between the outer wall of the tube and the flange 9 of the electric heating tube to be tested, and then use an insulation resistance tester to detect the insulation resistance value between the conductive part of the electric heating tube and the shell, then close the air inlet valve 8, open the exhaust valve 16, and close the exhaust valve 16 after there is no pressure inside. Finally, reset the pressure test container 12 to a vertical state, remove the electric heating tube, and place it according to the test results. The water in the pressure test container 12 does not need to be poured out, and continue to test the next electric heating tube 11.

[0048] The whole testing process includes: installing the electric heating tube 11 - tilting the pressure test container 12 - pressurizing - observing and testing - closing the air inlet valve 8 - opening the air release valve to release pressure - closing the air release valve - resetting the pressure test container 12 to a vertical state - removing the electric heating tube 11 - repeating the above process.

[0049] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A pressure test method for detecting the sealing performance of an electric heating tube, using a pressure test device for detecting the sealing performance of an electric heating tube, comprising a base, a bracket arranged on the base, a rotating mechanism arranged on the bracket, a pressure test container arranged on the rotating mechanism, a pressurizing structure arranged at the tail of the pressure test container, an insertion port arranged at the top of the pressure test container, the inner diameter of the container is larger than the outer diameter of the electric heating tube; the bracket comprises a column 1 and a column 2 respectively arranged on both sides of the base, the height of the column 1 is larger than the height of the column 2, the column 1 is connected to the base via a reinforcing rod, and the rotating mechanism is arranged on the upper part of the column 1; the rotating mechanism It includes a rotating shaft, which is arranged on the upper part of the first column, and a container sleeve is sleeved on the rotating shaft, and the pressure test container is inserted in the container sleeve; the pressurizing structure includes a vent pipe, the upper end of the vent pipe is inserted into the tail of the pressure test container, and an air inlet is arranged at the lower end of the vent pipe, and the air inlet is connected to the air inlet pipe through an air inlet valve, and an air outlet is opened in the middle of the vent pipe, and the air outlet is connected to the air outlet pipe through an exhaust valve; a soft pad is arranged on the top of the second column; the insertion port is provided with a flange plate 1, and the flange plate 1 matches the flange plate 2 of the electric heating tube, and a sealing gasket is arranged on the upper surface of the flange plate 1, characterized in that, The specific steps are as follows: Step 1, rotating the pressure test container so that the pressure test container is in a vertical state, and the exhaust valve and the intake valve are closed; Step 2, adding water into the pressure test container from the insertion port of the pressure test container, leaving a distance between the water surface and the insertion port of the pressure test container; Step 3, insert the electric heating tube to be tested into the pressure test container from the flange one at the insertion port, and fix the flange one and the flange two together; Step 4, rotating the pressure test container so that the pressure test container is placed on the second column and is in an inclined state, and the height of the insertion port of the pressure test container is lower than the height of the rotating shaft; Step 5, the air inlet pipe is connected to the pressurizing device, and the air inlet valve is opened so that the pressure inside the pressure test container reaches the set 1.2 MPa; Step 6, after a period of pressure holding time, observe whether there is water seepage at the joint between the outer wall of the electric heating tube to be tested and the second flange; Step 7, close the air inlet valve, open the exhaust valve, and close the exhaust valve after there is no pressure inside the pressure test container; Step 8, restore the pressure test container to a vertical state, remove the electric heating tubes, and place them according to the test results.

2. A pressure test method for detecting the sealing performance of an electric heating tube according to claim 1, characterized in that: The holding time is 5-10 seconds.

3. A pressure test method for detecting the sealing performance of an electric heating tube according to claim 2, characterized in that: The water level of the pressure test container in the inclined state is not lower than the height of the rotating shaft.

4. A pressure test method for detecting the sealing performance of an electric heating tube according to claim 3, characterized in that: In step 6, an insulation resistance tester is also required to detect the insulation resistance value between the conductive part of the electric heating tube and the shell.

Images