A reliability simulation detection device for electric heating tape in low temperature environment

Abstract

The present invention relates to the technical field of electric heating tape detection equipment, and specifically to a reliability simulation detection device for an electric heating tape under a low-temperature environment, by simulating the circulation of a detection medium in a detection pipeline, wherein when the nut moves horizontally toward the liquid outlet, the annular filter is in a state of elastic contraction toward its outer circle, until the nut moves close to the filtering end, the annular filter is pulled elastically toward its inner circle by a pull rope, and when the nut moves from the filtering end to the reset end, the annular filter remains in an expanded state, and is used to block solid materials precipitated from the detection medium in the detection pipeline at low temperature, until the nut moves to the reset end, the annular filter is reset to a contracted state, thereby simulating the actual use scenario of the pipeline, if the thermal insulation effect of any area in the pipeline is poor, solid materials will precipitate, and the annular filter is moved back and forth horizontally in the pipeline to block and filter the precipitated solid materials, so as to intuitively judge the thermal insulation effect of the electric heating tape to be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating tape detection equipment, and in particular to a reliability simulation detection device for electric heating tape in a low-temperature environment. Background Art

[0002] Electric heating is widely used in the heating and insulation of pipelines and other equipment to compensate for the heat lost to the environment by the pipeline. In order to ensure uniform temperature in the pipeline and reduce the laying and installation cost of the electric heating tape, wave winding, spiral winding and other methods are usually adopted, and fixed with aluminum foil or aluminum tape. The amount of tape is appropriately increased at elbows, flanges and other parts to ensure thermal efficiency. However, it is affected by many factors such as the different quality of the electric heating tape, different laying methods, voltage stability, service life and pipeline environment. Especially in low temperature environments, it is difficult to ensure efficient and stable insulation of each area in the pipeline. In particular, when used in sewage pipes, biochemical pipes, etc., the temperature in the pipeline is uneven, which may cause local agglomeration and blockage. In this regard, in the prior art, for example, Chinese patent document CN113624529A is a submarine pipeline electric heating tape. The heating performance simulation test device and method of the heating tape, etc., simulate the oil conveying in the pipeline test piece, and the electric heating tape heats the pipeline test piece. The temperature measuring optical fiber is tightly attached to the outer wall of the inner pipe to measure the temperature of the inner pipe surface. Thermocouples are placed at 11 designated positions inside the pipeline test piece to directly test the temperature of the oil conveyed in the pipeline. However, it is obvious that even with enough temperature measuring optical fibers, thermocouples, etc., it is impossible to completely cover all the circulating medium areas in the pipeline, that is, it is impossible to ensure uniform insulation of all areas in the pipeline. In addition, the layout of a large number of detection optical fibers or thermocouples is cumbersome to operate and the detection cost is high. In addition, the layout of a large number of detection optical fibers or thermocouples and other equipment inside and outside the pipeline is obviously not in line with the actual use scenario of the pipeline. Instead, it will deviate from the actual insulation effect of the pipeline heating, resulting in deviations in the simulation detection. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to propose a reliability simulation detection device for electric heating tapes in low temperature environments to solve the problems of insufficient comprehensiveness and cumbersome operation in existing pipeline electric heating simulation detection.

[0004] Based on the above objectives, the present invention provides a device for simulating the reliability of electric heating tapes in a low-temperature environment, comprising a detection pipe, the outer wall of which is wound an electric heating tape to be tested:

[0005] The two ends of the detection pipe are respectively connected to a liquid inlet and a liquid outlet, a horizontal shaft is rotatably connected in the detection pipe, and a paddle is connected to the end of the horizontal shaft close to the liquid outlet, which is used to circulate the detection medium in the detection pipe. A reciprocating thread is provided on a section of the horizontal shaft, and the end of the reciprocating thread close to the paddle is the filtering end, and the other end of the reciprocating thread away from the paddle is the reset end. A nut is engaged with the position of the reciprocating thread on the horizontal shaft, which is used to drive the nut to move back and forth laterally between the filtering end and the reset end;

[0006] An inner slide is slidably connected to the inner wall of the detection pipe, and an annular filter is connected to the inner ring of the inner slide. The inner ring of the annular filter is connected to a pull rope along its radial direction, and the pull rope is connected to the nut. When the nut starts to move horizontally toward the liquid outlet, the annular filter is in a state of elastic contraction toward its outer ring, and the pull rope is pulled outward until the nut moves close to the filtering end, and the annular filter is elastically expanded toward its inner ring by the pull rope. When the nut moves from the filtering end to the reset end, the annular filter maintains an elastically expanded state, which is used to block the solid material precipitated from the detection medium at low temperature in the detection pipe, so as to judge the thermal insulation effect of the electric heating tape to be tested, until the nut moves to the reset end, and the annular filter is reset to an elastically contracted state.

[0007] Preferably, the liquid inlet is arranged at the top of one end of the detection pipe, and the liquid outlet is arranged at the upper part of the other end of the detection pipe.

[0008] Preferably, a fixed filter is vertically fixed at one end of the detection pipe near the liquid outlet.

[0009] Preferably, a material storage box is provided at the bottom end of the detection pipeline. The top of the material storage box is designed to be open and communicated with the inside of the detection pipeline, and is used to collect solid materials filtered by the annular filter. One end of the material storage box is located below the liquid inlet, and the other end is located below the reset end.

[0010] Preferably, the storage box is made of transparent material.

[0011] Preferably, a first magnetic block is provided at the filter end, a second magnetic block is provided at the reset end, and a plurality of cross guide rods are fixedly connected between the first magnetic block and the second magnetic block. The cross guide rod passes through the nut, and a limit rod is inserted in the nut. A limit pin is provided on the limit rod. A limit buckle is provided on the end of the pull rope close to the annular filter screen, and the other end of the pull rope away from the annular filter screen passes through the nut, and a draw hook is connected to the end that passes through the nut. A hook groove is correspondingly provided on the cross guide rod. When the nut moves close to the filter end, the draw hook slides to the hook groove with the nut and engages with the hook groove. , thereby pulling the pull rope to make the annular filter elastically expand toward its inner circle. Until the nut moves to the filter end, the limit buckle is pulled into the nut along with the pull rope, and at the same time, the first magnetic block magnetically attracts the limit rod, and the limit rod moves laterally toward the first magnetic block, and drives the limit pin to be inserted into the limit buckle, so that the annular filter maintains an elastically expanded state. Until the nut moves to the reset end, the second magnetic block magnetically attracts the limit rod, and the limit rod moves laterally toward the second magnetic block, and drives the limit pin to disengage from the limit buckle, and the annular filter is reset to an elastically contracted state.

[0012] Preferably, outer grooves are provided on both sides of the nut, and both end portions of the limiting rod are inserted into the outer grooves and connected with end heads, through which the first magnetic block or the second magnetic block is adsorbed.

[0013] Preferably, a thin groove for the pull rope to pass through is opened on the limiting rod along its length direction, and the limiting pin is connected to the side end of the limiting rod and is designed in an L-shape.

[0014] Preferably, the end of the pull rope passing through the nut is connected to a blocking block and is connected to the draw hook through the blocking block.

[0015] Preferably, the tail end of the pull hook is rotatably connected to the outside of the block, and an elastic part is connected between the block and the block. A take-up wheel is provided in the nut for rotating and winding the pull rope until the block abuts against the outside of the nut, and the pull hook is pushed by the elastic part so that the head end of the pull hook abuts against the outside of the cross guide rod.

[0016] The beneficial effects of the present invention are as follows: by simulating the circulation of the detection medium in the detection pipeline, the nut moves back and forth laterally between the filter end and the reset end, an inner slide is slidably connected to the inner wall of the detection pipeline, an annular filter is connected to the inner ring of the inner slide, and the inner ring of the annular filter is connected to a pull rope along its radial direction, and the pull rope is connected to the nut, so that when the nut moves laterally toward the liquid outlet, the annular filter is in a state of elastic contraction toward its outer ring, and the pull rope is pulled outward until the nut moves close to the filter end, and the annular filter is elastically expanded toward its inner ring by pulling the pull rope, and the nut When the nut moves from the filtering end to the reset end, the annular filter screen maintains an elastically expanded state, which is used to block the solid materials precipitated by the detection medium at low temperature in the detection pipeline. When the nut moves to the reset end, the annular filter screen resets to an elastically contracted state, thereby simulating the actual use scenario of the pipeline. If the thermal insulation effect of any area in the pipeline is poor, solvent solid materials will precipitate. The annular filter screen moves back and forth in the pipeline to block and filter the precipitated solid materials. In this way, the thermal insulation effect of the electric heating cable to be tested can be intuitively judged, and the detection is more comprehensive. There is no need to arrange too many optical fibers or electric couples and other equipment, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the nut of the present invention when it moves laterally toward the liquid outlet;

[0019] Figure 2 This is a structural schematic diagram of the annular filter screen of the present invention in an elastically contracted state;

[0020] Figure 3 This is a schematic diagram of the internal structure of the nut of the present invention when it moves laterally toward the liquid outlet;

[0021] Figure 4 It is a structural schematic diagram of the take-up wheel of the present invention;

[0022] Figure 5 This is a schematic diagram of the overall structure of the nut of the present invention when it moves close to the filtering end;

[0023] Figure 6 This is a schematic diagram of the internal structure of the nut of the present invention when it moves close to the filtering end;

[0024] Figure 7 This is a schematic diagram of the overall structure of the present invention when the nut is moved to the filtering end;

[0025] Figure 8 This is a schematic diagram of the internal structure of the nut of the present invention when it is moved to the filtering end;

[0026] Figure 9 It is a structural schematic diagram of the annular filter screen of the present invention in an elastically expanded state;

[0027] Figure 10 This is a schematic diagram of the overall structure of the nut of the present invention when it moves toward the reset end;

[0028] Figure 11 It is a schematic diagram of the overall structure of the nut of the present invention when it moves to the reset end;

[0029] Figure 12 It is a schematic diagram of the internal structure of the nut of the present invention when it moves to the reset end.

[0030] The following are marked in the figure:

[0031] 1. Detection pipe; 100. Connecting rod; 2. Liquid inlet; 3. Liquid outlet; 4. Horizontal axis; 5. Paddle; 6. Nut; 60. End; 61. Limit rod; 610. Slot; 62. Limit pin; 63. Outer slot; 7. Inner slide; 8. Annular filter; 9. Pull rope; 90. Block; 91. Limit buckle; 10. Fixed filter; 11. Storage box; 12. First magnetic block; 13. Second magnetic block; 130. Avoidance hole; 14. Horizontal guide rod; 15. Draw hook; 16. Hook slot; 17. Take-up wheel. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] like Figure 1 、 Figure 2As shown, a reliability simulation detection device for electric heating tapes in a low-temperature environment comprises a detection pipe 1, an outer wall of the detection pipe 1 is wound with an electric heating tape to be tested, two ends of the detection pipe 1 are respectively connected to a liquid inlet 2 and a liquid outlet 3, a horizontal shaft 4 is rotatably connected in the detection pipe 1, an end of the horizontal shaft 4 close to the liquid outlet 3 is connected to a paddle 5 for circulating a detection medium in the detection pipe 1, a section of the horizontal shaft 4 is provided with a reciprocating thread, the end of the reciprocating thread close to the paddle 5 is a filtering end, and the other end of the reciprocating thread away from the paddle is a reset end, a nut 6 is meshedly connected to the position of the reciprocating thread on the horizontal shaft 4 for driving the nut 6 to move back and forth laterally between the filtering end and the reset end, an inner slide 7 is slidably connected to the inner wall of the detection pipe 1, An annular filter screen 8 is connected to the inner ring of the inner slide 7, and a pull rope 9 is connected to the inner ring of the annular filter screen 8 along its radial direction. The pull rope 9 is connected to the nut 6. When the nut 6 starts to move laterally toward the liquid outlet 3, the annular filter screen 8 is in a state of elastic contraction toward its outer ring, and the pull rope 9 is pulled outward until the nut 6 moves close to the filtering end, and the annular filter screen 8 is elastically expanded toward its inner ring by the pull rope 9. When the nut 6 moves from the filtering end to the reset end, the annular filter screen 8 maintains an elastic expansion state, which is used to block the solid material precipitated at low temperature by the detection medium in the detection pipeline 1, so as to judge the thermal insulation effect of the electric heating tape to be tested, until the nut 6 moves to the reset end, and the annular filter screen 8 is reset to an elastic contraction state.

[0035] The present invention simulates and designs a section of a pipeline in actual application as a detection pipeline 1, and an electric heating tape to be tested is wound on the outer wall of the detection pipeline 1, and a liquid inlet 2 and a liquid outlet 3 are respectively connected to the two ends of the detection pipeline 1, and a horizontal shaft 4 is connected to rotate in the detection pipeline 1, and a paddle 5 is connected to the end of the horizontal shaft 4 close to the liquid outlet 3. Specifically, one end of the horizontal shaft 4 passes through the detection pipeline 1 and is connected to a driving device such as a motor and a reducer, which is used to drive the horizontal shaft 4 to rotate evenly and slowly, thereby driving the paddle 5 to rotate synchronously and slowly, and draining the liquid detection medium from the liquid inlet 2 to the liquid outlet 3 for discharge, which is used to simulate the circulating detection medium in the detection pipeline 1. In particular, a section on the horizontal shaft 4 is provided with a reciprocating thread, that is, one section on the horizontal shaft 4 adopts the existing conventional structural design similar to the reciprocating screw, and the reciprocating thread The end of the head and tail ends close to the blade 5 is defined as the filtering end, and the other end away from the blade is defined as the reset end. The nut 6 is engaged with the position of the reciprocating thread on the horizontal shaft 4, which then drives the nut 6 to move back and forth laterally between the filtering end and the reset end. At the same time, an inner slide 7 is slidably connected to the inner wall of the detection pipe 1. Specifically, the detection pipe 1 can be designed as a horizontal cylindrical shape, and the inner slide 7 is a circular ring shape attached to the inner wall of the detection pipe 1, so that the inner slide 7 slides laterally along the inner wall of the detection pipe 1. An annular filter screen 8 is connected to the inner ring of the inner slide 7, and a pull rope 9 is connected to the inner ring of the annular filter screen 8 along its radial direction. The pull rope 9 is connected to the nut 6, so that the nut 6 drives the annular filter screen 8 and the inner slide 7 to move back and forth synchronously. When the nut 6 starts to move laterally toward the liquid outlet 3, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the annular filter screen 8 is in a state of elastic contraction toward its outer circle, and the pull rope 9 is pulled outward until the nut 6 moves close to the filter end. Figure 5 、 Figure 6 As shown, the annular filter screen 8 is elastically expanded toward its inner circle by pulling the pull rope 9, and the nut 6 moves from the filtering end to the reset end, as shown in FIG. Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the annular filter 8 maintains an elastically expanded state to block the solid material precipitated from the detection medium in the detection pipe 1 at low temperature until the nut 6 moves to the reset end, as shown in FIG. Figure 11 、 Figure 12As shown, the annular filter 8 is reset to an elastically contracted state, wherein the liquid detection medium can be a certain solution, the precipitation temperature of the solvent in the solution is matched with the target temperature of the pipeline to be insulated, and the actual use environment temperature is simulated outside the pipeline, and the electric heating cable to be tested is wound around the outside of the pipeline, and the solution flowing out of the liquid outlet 3 can be replenished with part of the solvent, and the temperature is controlled to a preset temperature, and then passed to the liquid inlet 2 to circulate through the detection pipeline 1, thereby simulating the actual use scenario of the pipeline. If the insulation effect of any area in the pipeline is not good, solvent solid material will precipitate, and the annular filter 8 moves back and forth in the pipeline to block and filter the precipitated solid material, so that the insulation effect of the electric heating cable to be tested can be intuitively judged, the detection is more comprehensive, there is no need to arrange too many optical fibers or electric couples and other equipment, and the operation is simple.

[0036] More preferably, the inner slide 7 and the nut 6 may be connected via a radial connecting rod to ensure that the inner slide 7 slides synchronously with the nut 6 .

[0037] In an embodiment of the present invention, Figure 1 As shown, the liquid inlet 2 is provided at the top of one end of the detection pipe 1 , and the liquid outlet 3 is provided at the upper portion of the other end of the detection pipe 1 .

[0038] In an embodiment of the present invention, Figure 1 As shown, a fixed filter screen 10 is vertically fixed at one end of the detection pipe 1 near the liquid outlet 3, which is used to intercept the residual precipitated solid materials and try to make all the precipitated solid materials be filtered and collected by the annular filter screen 8, so as to comprehensively and accurately judge the thermal insulation effect of the electric heating tape. A through hole is reserved in the middle of the fixed filter screen 10 for the horizontal axis 4 to pass through, so as not to affect the rotation of the horizontal axis 4. In addition, the horizontal axis 4 can also only extend to the blade 5 and not contact the fixed filter screen 10.

[0039] In an embodiment of the present invention, Figure 1 As shown, a storage box 11 is provided at the bottom of the detection pipe 1. The top of the storage box 11 is designed to be open and communicated with the detection pipe 1. The density of the precipitated solid material is generally greater than that of the solvent and gradually sinks in the solvent, so that the storage box 11 at the bottom is used to collect the precipitated solid material filtered by the annular filter 8. At the same time, one end of the storage box 11 is located below the liquid inlet 2, and the other end is located below the reset end, as shown in FIG. Figure 1 As shown, the reset end is arranged at the rear end of the liquid inlet 2. The liquid detection medium at the rear end of the liquid inlet 2 is relatively static, which is more conducive to the precipitation of solid materials, thereby more conducive to the efficient collection of filtered solid materials.

[0040] In an embodiment of the present invention, Figure 1 As shown, the material storage box 11 is made of transparent material, which is more conducive to visually observing the precipitation of solid materials caused by local lack of insulation in the pipeline, so as to judge the heating efficiency and reliability of the electric heating tape.

[0041] In an embodiment of the present invention, Figures 1 to 12 As shown, a first magnetic block 12 is provided at the filtering end, and a second magnetic block 13 is provided at the reset end. Specifically, the first magnetic block 12 and the second magnetic block 13 can be respectively connected to a connecting rod 100 and fixedly connected to the pipeline through the connecting rod 100. The horizontal axis 4 passes through the first magnetic block 12 and the second magnetic block 13, and is not connected to the first magnetic block 12 and the second magnetic block 13. A plurality of cross guide rods 14 are fixedly connected between the first magnetic block 12 and the second magnetic block 13. The cross guide rods 14 pass through the nut 6 and are arranged parallel to the horizontal axis 4 for guiding the reciprocating movement of the nut 6.

[0042] In particular, a limiting rod 61 is inserted into the nut 6, and a limiting pin 62 is provided on the limiting rod 61. A limiting buckle 91 is provided on one end of the pull rope 9 close to the annular filter 8. The other end of the pull rope 9 away from the annular filter 8 passes through the nut 6, and the end that passes through the nut 6 is connected to a draw hook 15. A hook groove 16 is correspondingly provided on the cross guide rod 14 near the filter end. Therefore, when the nut 6 moves close to the filter end, Figure 5 、 Figure 6 As shown, the hook 15 slides with the nut 6 to the hook groove 16 and engages with the hook groove 16, and continues to move horizontally with the nut 6, thereby pulling the pull rope 9 to elastically expand the annular filter 8 toward its inner circle until the nut 6 moves to the filter end, as shown in FIG. Figure 7 、 Figure 8 、 Figure 9 As shown, the limit buckle 91 is pulled into the nut 6 along with the pull rope 9, and at the same time, the limit rod 61 is magnetically attracted by the first magnetic block 12. The limit rod 61 moves horizontally toward the first magnetic block 12 and drives the limit pin 62 to be inserted into the limit buckle 91. At this time, the nut 6 moves horizontally in the opposite direction and toward the reset end. Although the limit rod 61 is separated from the adsorption of the first magnetic block 12, the elastic force of the elastic contraction of the annular filter 8 has a tendency to pull the pull rope 9 outward, so the limit buckle 91 is tightened and tightly inserted and limited by the limit pin 62, so that the annular filter 8 maintains an elastically expanded state. Figure 9 、 Figure 10 As shown, it plays a filtering role, and even if there is a small gap between the inner ring of the elastically expanded annular filter screen 8 and the nut 6, it is difficult for solid materials to escape along the gap, and even if a small amount of solid materials escape, they will still be blocked by the fixed filter screen 10 and remain in the pipeline, and eventually be collected in the storage box 11 until the nut 6 moves to the reset end, as shown. Figure 11 、 Figure 12 As shown, the second magnetic block 13 magnetically attracts the limiting rod 61, the limiting rod 61 moves horizontally toward the second magnetic block 13, and drives the limiting pin 62 to disengage the limiting buckle 91, and the elastic force of the elastic contraction of the annular filter 8 pulls out the pull rope 9 again, as shown in FIG. Figure 2 As shown, it is restored to the elastically contracted state, thereby achieving a reciprocating filtering process.

[0043] A relief hole 130 is provided on a side of the second magnetic block 13 facing the nut 6 for evading the hook 15 .

[0044] In an embodiment of the present invention, Figures 1 to 12 As shown, outer grooves 63 are provided on both sides of the nut 6, and the end portions of the limit rod 61 are inserted into the outer grooves 63 and connected to the end heads 60. The first magnetic block 12 or the second magnetic block 13 is adsorbed by the end heads 60, thereby improving the adsorption efficiency and limiting the limit rod 61 so that the limit rod 61 cannot move laterally and slide out of the nut 6.

[0045] In an embodiment of the present invention, Figures 1 to 12 As shown, a thin groove 610 for the pull rope 9 to pass through is opened on the limit rod 61 along its length direction, and the limit pin 62 is connected to the side end of the limit rod 61 and is designed in an L-shape. The limit buckle 91 adopts the existing conventional structure similar to the ring buckle, which is convenient for the L-shaped long side of the limit pin 62 to be inserted into the buckle hole of the limit buckle 91 to achieve locking and limiting.

[0046] In an embodiment of the present invention, Figures 1 to 12 As shown, the end of the pull rope 9 passing through the nut 6 is connected to a block 90 and is connected to the hook 15 through the block 90, which is conducive to the stable connection of the pull rope 9. At the same time, the block 90 is used to limit the position of the pull rope 9 to prevent the pull rope 9 from sliding directly out along the nut 6.

[0047] In an embodiment of the present invention, Figures 1 to 12 As shown, optionally, the tail end of the hook 15 is rotatably connected to the outside of the block 90, and an elastic member is connected between the hook 15 and the block 90, wherein the elastic member can be an existing conventional rubber elastic block, spring or other elastic member, which is used to push the hook 15 toward the direction of the cross guide rod 14, so that the head end of the hook 15 is against the outside of the cross guide rod 14, which is conducive to efficient engagement with the hook groove 16. Figure 4 As shown, a take-up wheel 17 may also be provided inside the nut 6, and the take-up wheel 17 and the inside of the nut 6 may be connected by an elastic member such as a torsion spring for rotating the winding rope 9, so that when the limit pin 62 is inserted into the limit buckle 91 and the nut 6 moves laterally toward the reset end, the draw rope 9 is automatically wound by the take-up wheel 17 to prevent redundant draw ropes 9 from being scattered outside the nut 6 until the block 90 abuts against the outside of the nut 6.

[0048] In addition, optionally, the end of the pull rope 9 passing through the nut 6 can also pass through the block 90 and then be connected to the pull hook 15, and the head end of the pull hook 15 is tilted against the outer side of the cross guide rod 14, which is conducive to efficient connection with the hook groove 16. A structure similar to the existing tape measure can be designed in the nut 6 for winding up the pull rope 9.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. A device for simulating the reliability of an electric heating tape in a low-temperature environment, comprising a detection pipe (1), the outer wall of which is wound an electric heating tape to be tested, and characterized in that: The two ends of the detection pipe (1) are respectively connected to a liquid inlet (2) and a liquid outlet (3); a transverse shaft (4) is rotatably connected in the detection pipe (1); a paddle (5) is connected to one end of the transverse shaft (4) close to the liquid outlet (3) for circulating the detection medium in the detection pipe (1); a reciprocating thread is provided on a section of the transverse shaft (4); the end of the reciprocating thread close to the paddle (5) is a filtering end, and the other end of the reciprocating thread away from the paddle (5) is a reset end; a nut (6) is engaged and connected at the position of the reciprocating thread on the transverse shaft (4) for driving the nut (6) to move back and forth laterally between the filtering end and the reset end; An inner slide (7) is slidably connected to the inner wall of the detection pipe (1), and an annular filter (8) is connected to the inner ring of the inner slide (7). The inner ring of the annular filter (8) is connected to a pull rope (9) along its radial direction. The pull rope (9) is connected to the nut (6). When the nut (6) starts to move horizontally toward the liquid outlet (3), the annular filter (8) is in an elastically contracted state toward its outer ring direction, and the pull rope (9) is pulled outward until the nut (6) moves close to the filtering end, and the annular filter (8) is pulled by the pull rope (9) to elastically expand toward its inner ring direction. When the nut (6) moves from the filtering end to the reset end, the annular filter (8) maintains an elastically expanded state, which is used to block the solid material precipitated by the detection medium at low temperature in the detection pipe (1), so as to judge the thermal insulation effect of the electric heating tape to be tested, until the nut (6) moves to the reset end, and the annular filter (8) is reset to an elastically contracted state.

2. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 1 is characterized in that: The liquid inlet (2) is provided at the top of one end of the detection pipe (1), and the liquid outlet (3) is provided at the upper portion of the other end of the detection pipe (1).

3. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 1 is characterized in that: A fixed filter screen (10) is vertically fixedly provided at one end of the detection pipe (1) close to the liquid outlet (3).

4. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 1 is characterized in that: A material storage box (11) is provided at the bottom end of the detection pipe (1). The top end of the material storage box (11) is designed to be open and communicate with the inside of the detection pipe (1) and is used to collect solid materials filtered by the annular filter (8). One end of the material storage box (11) is located below the liquid inlet (2), and the other end is located below the reset end.

5. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 4 is characterized in that: The material storage box (11) is made of transparent material.

6. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 1 is characterized in that: A first magnetic block (12) is provided at the filtering end, and a second magnetic block (13) is provided at the reset end. A plurality of cross-guide rods (14) are fixedly connected between the first magnetic block (12) and the second magnetic block (13). The cross-guide rod (14) passes through the nut (6). A limiting rod (61) is inserted into the nut (6). A limiting pin (62) is provided on the limiting rod (61). A limiting buckle (91) is provided on one end of the pull rope (9) close to the annular filter (8). The other end of the pull rope (9) away from the annular filter (8) passes through the nut (6), and a draw hook (15) is connected to the end that passes through the nut (6). A hook groove (16) is correspondingly provided on the cross-guide rod (14). When the nut (6) moves close to the filtering end, the draw hook (15) slides to the hook groove (16) along with the nut (6) and engages with the hook The grooves (16) are engaged with each other, thereby pulling the pull rope (9) to make the annular filter (8) elastically expand in the direction of its inner circle, until the nut (6) moves to the filter end, the limit buckle (91) is pulled into the nut (6) along with the pull rope (9), and at the same time, the limit rod (61) is magnetically attracted by the first magnetic block (12), the limit rod (61) moves horizontally toward the first magnetic block (12), and drives the limit pin (62) to be inserted into the limit buckle (91), so that the annular filter (8) maintains an elastic expansion state, until the nut (6) moves to the reset end, the limit rod (61) is magnetically attracted by the second magnetic block (13), the limit rod (61) moves horizontally toward the second magnetic block (13), and drives the limit pin (62) to disengage from the limit buckle (91), and the annular filter (8) is reset to an elastic contraction state.

7. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 6, characterized in that: External grooves (63) are provided on both sides of the nut (6), and both ends of the limiting rod (61) are inserted into the external grooves (63) and connected to the end heads (60), and the first magnetic block (12) or the second magnetic block (13) is adsorbed through the end heads (60).

8. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 6, characterized in that: The limiting rod (61) is provided with a thin groove (610) along its length direction for the pull rope (9) to pass through. The limiting pin (62) is connected to the side end of the limiting rod (61) and is designed in an L-shape.

9. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 6, characterized in that: The end of the pull rope (9) passing through the nut (6) is connected to a block (90) and is connected to the draw hook (15) through the block (90).

10. The reliability simulation detection device for electric heating tape in low temperature environment according to claim 9, characterized in that: The tail end of the draw hook (15) is rotatably connected to the outside of the block (90), and an elastic member is connected between the draw hook (15) and the block (90). A take-up wheel (17) is provided in the nut (6) for rotating and winding the draw rope (9) until the block (90) abuts against the outside of the nut (6). The draw hook (15) is pushed by the elastic member so that the head end of the draw hook (15) abuts against the outside of the cross guide rod (14).

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