Simulation detection device for reliability of electric tracing band in low-temperature environment

Abstract

The invention relates to the technical field of electric tracing band detection equipment, in particular to an electric tracing band reliability simulation detection device in a low-temperature environment, a detection medium is simulated to circulate in a detection pipeline, and when a nut transversely moves towards a liquid outlet, an annular filter screen is in an elastic shrinkage state towards the outer ring of the annular filter screen; when the nut moves to be close to the filter end, the annular filter screen is pulled by the pull rope to elastically expand towards the inner ring direction, and when the nut moves from the filter end to the reset end, the annular filter screen is kept in an expanded state and is used for blocking solid materials separated out by a detection medium at low temperature in the detection pipeline, and when the nut moves to the reset end, the annular filter screen is closed. The annular filter screen is reset to be in a contraction state, so that the real use scene of the pipeline is simulated, if the heat preservation effect of any area in the pipeline is not good, solid materials can be separated out, and the heat preservation effect of the to-be-tested electric tracing band can be visually judged by blocking and filtering the separated solid materials through reciprocating transverse movement of the annular filter screen in the pipeline.

Description

Technical Field

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

[0002] Electric heating is widely used in heating and heat preservation 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 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 different quality of electric heating tapes, 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. Especially when used for 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 discloses an electric heating tape for submarine pipelines. The heating performance simulation test device and method of the heating tape, etc., simulate the oil conveying in the pipeline test piece, the electric heating tape heats the pipeline test piece, and the temperature measuring optical fiber is close 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 flowing 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 obviously does not conform to 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 simulated 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 a low temperature environment to solve the problems of insufficient comprehensiveness and cumbersome operation in existing pipeline electric heating simulation detection.

[0004] Based on the above purpose, the present invention provides a reliability simulation detection device for electric heating belts in a low temperature environment, comprising a detection pipeline, on the outer wall of which the electric heating belt to be tested is wound:

[0005] The two ends of the detection pipeline are respectively connected with a liquid inlet and a liquid outlet, a horizontal axis is rotatably connected in the detection pipeline, and a paddle is connected to one end of the horizontal axis close to the liquid outlet, which is used to circulate the detection medium in the detection pipeline, and a reciprocating thread is provided on a section of the horizontal axis, 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, and a nut is meshed and connected at the position of the reciprocating thread on the horizontal axis, 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 pipeline, 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 laterally toward the liquid outlet, the annular filter is in a state of elastic contraction toward its outer ring direction, 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 direction by pulling 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 by the detection medium in the detection pipeline at low temperature, so as to judge the thermal insulation effect of the electric heating belt 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 pipeline, and the liquid outlet is arranged at the upper part of the other end of the detection pipeline.

[0008] Preferably, a fixed filter is vertically fixedly provided at one end of the detection pipe close to 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 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 material 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, 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, 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, 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 passing through the nut, and a hook groove is correspondingly provided on the cross guide rod, and 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 direction, until the nut moves to the filtering end, the limit buckle is pulled into the nut along with the pull rope, and at the same time, the limit rod is magnetically attracted by the first magnetic block, 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 limit rod is magnetically attracted by the second magnetic block, 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 limit rod along its length direction, and the limit pin is connected to the side end of the limit 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 pull 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 member 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 member 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 circulating flow of the detection medium in the detection pipeline, the nut moves back and forth laterally between the filtering 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 a pull rope is connected to the inner ring of the annular filter 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 in the direction of 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 in the direction of 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 in the detection pipeline at low temperature, until 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 is not good in any area of ​​the pipeline, solvent solid materials will precipitate, and the annular filter screen can be moved 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 belt 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It 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 It is a structural schematic diagram of the annular filter screen of the present invention in an elastically contracted state;

[0020] Figure 3 It 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 It is a schematic diagram of the overall structure when the nut of the present invention moves close to the filtering end;

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

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

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

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

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

[0028] Fig.11 It is a schematic diagram of the overall structure when the nut of the present invention is moved to the reset end;

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

[0030] The markings in the figure are:

[0031] 1. Detection pipeline; 100. Connecting rod; 2. Liquid inlet; 3. Liquid outlet; 4. Horizontal axis; 5. Paddle blade; 6. Nut; 60. End; 61. Limit rod; 610. Fine groove; 62. Limit pin; 63. Outer groove; 7. Inner slide; 8. Annular filter; 9. Pull rope; 90. Block; 91. Limit buckle; 10. Fixed filter; 11. Material storage box; 12. First magnetic block; 13. Second magnetic block; 130. Avoidance hole; 14. Horizontal guide rod; 15. Draw hook; 16. Hook groove; 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 in conjunction with specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be 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 described object changes, the relative positional relationship may also change accordingly.

[0034] like Figure 1 , Figure 2As shown, a reliability simulation detection device for electric heating tape 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 detected, two ends of the detection pipe 1 are respectively connected with 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 with 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, an 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 at 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 in the direction of 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 in the direction of its inner ring by pulling the pull rope 9. When the nut 6 moves from the filtering end to the reset end, the annular filter screen 8 maintains an elastically expanded state, which is used to block the solid material precipitated by the detection medium in the detection pipeline 1 at low temperature, so as to judge the thermal insulation effect of the electric heating belt to be tested, until the nut 6 moves to the reset end, the annular filter screen 8 is reset to an elastically contracted 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 belt 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 axis 4 is rotatably connected in the detection pipeline 1, and a paddle 5 is connected to one end of the horizontal axis 4 close to the liquid outlet 3. Specifically, one end of the horizontal axis 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 axis 4 to rotate evenly and slowly, thereby driving the paddle 5 to rotate synchronously and slowly, and guiding the liquid detection medium from the liquid inlet 2 to the liquid outlet 3 for discharge, so as to simulate the circulating detection medium in the detection pipeline 1. In particular, a section on the horizontal axis 4 is provided with a reciprocating thread, that is, one section on the horizontal axis 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 paddle 5 is defined as the filtering end, and the other end away from the paddle is defined as the reset end. A nut 6 is meshed and connected at the position of the reciprocating thread on the horizontal axis 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 horizontally placed 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, and an annular filter screen 8 is connected to the inner ring of the inner slide 7. At the same time, 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 direction 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 , Fig. 9 , Fig.10 As shown, the annular filter screen 8 remains in an elastically expanded state to block the solid material precipitated from the detection medium in the detection pipeline 1 at low temperature until the nut 6 moves to the reset end. Fig.11 , Fig.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 that the pipeline needs to be insulated, and the actual use environment temperature is simulated outside the pipeline, and the electric heating tape 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, solid solvent 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 tape 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 arranged at the top of one end of the detection pipeline 1, and the liquid outlet 3 is arranged at the upper part of the other end of the detection pipeline 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 belt. 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 paddle 5 and not contact the fixed filter screen 10.

[0039] In an embodiment of the present invention, Figure 1 As shown, a material storage box 11 is provided at the bottom of the detection pipeline 1. The top of the material storage box 11 is designed to be open and communicated with the detection pipeline 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 material 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 material storage box 11 is located below the liquid inlet 2, and the other end is located below the reset end. 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 resetting end. Specifically, the first magnetic block 12 and the second magnetic block 13 may be respectively connected with a connecting rod 100, and are fixedly connected to the pipeline through the connecting rod 100. The transverse 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 transverse guide rods 14 are fixedly connected between the first magnetic block 12 and the second magnetic block 13. The transverse guide rods 14 pass through the nut 6 and are arranged parallel to the transverse axis 4 for guiding the nut 6 to move back and forth.

[0042] In particular, a limit rod 61 is inserted into the nut 6, and a limit pin 62 is provided on the limit rod 61. A limit 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 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 , Fig. 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, and 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 screen 8 has a tendency to pull the pull rope 9 outward, so that the limit buckle 91 is tightened and tightly inserted and limited by the limit pin 62, so that the annular filter screen 8 maintains an elastically expanded state, as shown in FIG. Fig. 9 , Fig.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 finally be collected in the storage box 11 until the nut 6 moves to the reset end, as shown in FIG. Fig.11 , Fig.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 from 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 thereby reset to an elastically contracted state, thereby achieving a reciprocating filtering process.

[0043] A evasion 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 are connected to the end heads 60. The first magnetic block 12 or the second magnetic block 13 is adsorbed by the end heads 60, so as to improve the adsorption efficiency and limit the limit rod 61 so that the limit rod 61 cannot slide sideways 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 such as a 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, thereby facilitating the stable connection of the pull rope 9 and also limiting the position of the block 90 to prevent the pull rope 9 from directly sliding 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 up 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 engagement with the hook groove 16. A structure similar to an 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. Under the concept 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 reliability simulation detection device for electric heating cables in a low temperature environment, comprising a detection pipe (1), the outer wall of which is wound an electric heating cable to be tested, 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 inside the detection pipe (1); an end of the transverse shaft (4) close to the liquid outlet (3) is connected to a paddle (5) for circulating the detection medium in the detection pipe (1); a section of the transverse shaft (4) is provided with a reciprocating thread; an 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 meshedly connected to the transverse shaft (4) at the position of the reciprocating thread 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, and 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 a state of elastic contraction in the direction of 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 (8) is pulled by the pull rope (9) to elastically expand in the direction of its inner ring. When the nut (6) moves from the filtering end to the reset end, the annular filter (8) maintains an elastic expansion 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 belt to be tested, until the nut (6) moves to the reset end, and the annular filter (8) is reset to an elastic contraction state.

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

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

4. The reliability simulation detection device for electric heating belt 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 communicated with the inside of the detection pipe (1), and is used to collect solid materials filtered by the annular filter screen (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 belt 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 belt 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 resetting 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 limit rod (61) is inserted into the nut (6). A limit pin (62) is provided on the limit rod (61). A limit buckle (91) is provided on one end of the pull rope (9) close to the annular filter screen (8). The other end of the pull rope (9) away from the annular filter screen (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 filtering 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 laterally 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 laterally toward the second magnetic block (13), and drives the limit pin (62) to be separated from the limit buckle (91), so that the annular filter (8) can be reset to an elastic contraction state.

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

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

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

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