Bore measuring device and measuring apparatus

Abstract

The application relates to an inner diameter detection device and a detection equipment, the detection device comprising: a measuring rod; a measuring head arranged at one end of the measuring rod in the longitudinal direction of the measuring rod and used for extending into the inside of a pipeline to measure the inner diameter of the pipeline; and a sliding structure movably arranged on the measuring rod along the longitudinal direction of the measuring rod and capable of abutting against the end of the pipeline when the measuring head extends into the pipeline. The inner diameter detection device directly obtains the expansion joint length of the heat exchange pipe by measuring the position of the sliding structure without marking the position in the inside of the heat exchange pipe, the error is small, and the overall work efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of internal diameter testing technology, and in particular to an internal diameter testing device and testing equipment. Background Technology

[0002] Existing heat exchanger tube and tube sheet connection methods include expansion joint, welding, and a combination of expansion and welding. Among them, expansion joint uses a tube expander or explosive tube expander to expand the end of the heat exchanger tube inserted into the tube sheet hole and the tube sheet hole, causing plastic deformation of the heat exchanger tube and elastic deformation of the tube sheet. The elastic restoring force of the tube sheet firmly and tightly bonds the heat exchanger tube to the inner wall of the tube sheet hole, thus achieving the function of sealing and fixing the connection.

[0003] Dimensional control during the expansion process is crucial. Insufficient expansion can lead to loose connections and leaks, while excessive expansion may cause pipe deformation or cracks, affecting the heat exchanger's lifespan and safety. Therefore, performing dimensional checks after expansion is a key step in ensuring expansion quality.

[0004] Currently, the dimensional inspection of heat exchanger tubes after expansion is mostly carried out by using traditional dial indicators / micrometers to measure the inner diameter expansion. After measuring the inner diameter of the heat exchanger tube, it is necessary to mark the measurement position inside the heat exchanger tube and then obtain the expansion length of the heat exchanger tube through a second measurement. The overall work efficiency is low and it is easy to produce large errors. Utility Model Content

[0005] Therefore, it is necessary to provide an inner diameter detection device and equipment to address the problems of low efficiency and large errors in the dimensional inspection of heat exchange tubes after expansion joints.

[0006] In one aspect, this application provides an inner diameter detection device, the detection device comprising:

[0007] Measuring rod;

[0008] A measuring head is located at one end of the measuring rod along its longitudinal direction and is used to extend into the pipe to measure the inner diameter of the pipe;

[0009] A sliding structure is movably disposed on the measuring rod along the longitudinal direction of the measuring rod, and when the measuring head is inserted into the pipe, the sliding structure can abut against the end of the pipe.

[0010] In one embodiment, the measuring rod has length scale lines that extend along the longitudinal direction of the measuring rod, and the length scale lines are used to mark the position of the sliding structure relative to the measuring rod.

[0011] In one embodiment, the sliding structure is further provided with a precision scale line. During the movement of the sliding structure on the measuring rod, it has an initial position closest to the measuring head. When the sliding structure is in the initial position, the starting point of the precision scale line is aligned with the starting point of the length scale line, and the extension directions of the precision scale line and the length scale line are the same.

[0012] In one embodiment, the precision scale is a tenth or a hundredth degree scale.

[0013] In one embodiment, the sliding structure has a sliding hole and an observation hole, the measuring rod passes through the sliding hole, the observation hole is connected to the sliding hole, and the axis of the observation hole intersects the axis of the sliding hole;

[0014] When the sliding structure is in the initial position, the projection of the observation hole onto the measuring rod covers the starting point of the length scale line, and the precision scale line is set around the edge of the observation hole.

[0015] In one embodiment, a transparent protective element is provided inside the observation hole.

[0016] In one embodiment, the observation hole is a strip-shaped hole, and the longitudinal direction of the strip-shaped hole is parallel to the longitudinal direction of the measuring rod.

[0017] In one embodiment, the starting point of the length scale line has a scale reading of 0;

[0018] In one embodiment, the scale reading at the starting point of the length scale line is L1, where L1 is the distance from the starting point of the length scale line to the measuring point of the measuring head along the longitudinal direction of the measuring rod.

[0019] In one embodiment, the sliding structure includes a slider and a locking member, wherein the slider is movably disposed on the measuring rod along the longitudinal direction of the measuring rod;

[0020] The locking member is disposed on the sliding member, and the locking member can be controlled to lock or separate from the measuring rod. When the sliding member moves to any position relative to the measuring rod, the locking member can lock with the measuring rod and prevent the sliding member from continuing to move.

[0021] In one embodiment, the slider has a sliding hole and a threaded hole, the measuring rod passes through the sliding hole, the threaded hole is connected to the sliding hole, and the axis of the threaded hole intersects the axis of the sliding hole;

[0022] The locking member is threadedly connected to the threaded hole, and during the movement of the locking member along the threaded hole, the locking member can abut against or separate from the measuring rod.

[0023] In one embodiment, the locking member has a hand-tightening portion at the end away from the measuring rod, and the circumferential surface of the hand-tightening portion is provided with anti-slip texture.

[0024] In one embodiment, the inner diameter detection device further includes an indicator located at the other end of the measuring rod in its longitudinal direction and used to display the measurement data of the measuring head.

[0025] In one embodiment, the inner diameter detection device further includes a grip handle, one end of which is located at the other end of the measuring rod in its longitudinal direction, and the indicator is located at the other end of the grip handle.

[0026] In another aspect, this application also provides a testing device, including the inner diameter testing device as described in any of the above embodiments.

[0027] When the aforementioned inner diameter detection device is used to detect the expansion length of a heat exchanger tube, it first inserts a measuring head into the heat exchanger tube to measure its diameter, and then uses this diameter to determine the starting and ending positions of the expansion joint. Next, when the measuring head is in the starting position, the sliding structure is brought into contact with the end of the heat exchanger tube, and the position of the sliding structure relative to the measuring rod is recorded. Then, the measuring head is moved to the ending position, and the sliding structure is brought into contact with the end of the heat exchanger tube again, maintaining the same position relative to the measuring rod. Finally, the length between the two recorded positions of the sliding structure is the length between the starting and ending positions of the heat exchanger tube, which is the length of the heat exchanger tube. In this way, there is no need to mark the position inside the heat exchanger tube; the expansion length is obtained directly by measuring the position of the sliding structure, resulting in smaller errors and improved overall operational efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the inner diameter detection device in some embodiments of this application.

[0029] Figure 2 for Figure 1 Enlarged view of point A in the embodiment.

[0030] Figure 3 for Figure 1 A schematic diagram illustrating the operation of the inner diameter detection device when measuring the inner diameter of a pipe in the embodiment.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10 Measuring rod; 11 Measuring head; 12 Length scale line; 13 Indicator; 14 Handle;

[0033] 20. Sliding structure; 21. Precision scale line; 22. Sliding hole; 23. Observation hole; 24. Sliding part; 25. Locking part; 26. Threaded hole; 27. Hand-tightening part; 28. Anti-slip texture;

[0034] Pipe 30; tube sheet 31. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] See Figure 1 , Figure 1 A schematic diagram of an internal diameter measuring device according to an embodiment of this application is shown. The internal diameter measuring device provided in this embodiment includes a measuring rod 10, a measuring head 11, and a sliding structure 20. The measuring head 11 is located at one end of the measuring rod 10 along its longitudinal direction and is used to extend into a pipe 30 to measure the diameter of the pipe 30. In actual use, the other end of the measuring rod 10 is held by hand or connected to a moving device, allowing the measuring rod 10 and the measuring head 11 to extend into the pipe 30 to measure the internal diameter of the pipe 30. When the internal diameter measuring device is used to detect the expansion joint dimensions of heat exchanger tubes in heat exchanger products, the measuring head 11 can detect the diameter of the heat exchanger tube after expansion.

[0042] In actual use, after the heat exchange tubes are expanded, it is necessary to ensure that not only the expansion dimensions meet the design requirements, but also the expansion length meets the design requirements to avoid insufficient connection strength due to insufficient expansion length. Therefore, after measuring the diameter of the expanded heat exchange tubes, it is also necessary to measure the expansion length of the expanded heat exchange tubes.

[0043] Based on this, the sliding structure 20 is movably disposed on the measuring rod 10 along its longitudinal direction, and when the measuring head 11 extends into the pipe 30 from one end, the sliding structure 20 can abut against the end of the pipe 30. Thus, when the measuring head 11 moves inside the pipe 30, the sliding structure 20, under the action of the end of the pipe 30, will move along the measuring rod 10, so that the deeper the measuring head 11 is inside the pipe 30, the longer the distance between the sliding structure 20 and the measuring head 11 on the measuring rod 10.

[0044] Beneficial effect: The above-mentioned inner diameter detection device, through the sliding structure 20 abutting against the end of the pipe 30, when the length of the measuring head 11 extending into the pipe 30 is longer, the distance that the sliding structure 20 moves relative to the measuring head 11 on the measuring rod 10 is longer, so the length of the measuring head 11 extending into the pipe 30 can be estimated based on the distance of the sliding structure 20 moving on the measuring rod 10.

[0045] When the inner diameter measuring device is used to detect the expansion length of a heat exchanger tube, the measuring head 11 is first inserted into the heat exchanger tube to measure its diameter, and the starting and ending positions of the expansion are confirmed by the diameter. Then, when the measuring head 11 is in the starting position, the sliding structure 20 is brought into contact with the end of the heat exchanger tube, and the position of the sliding structure 20 relative to the measuring rod 10 is recorded. Next, the measuring head 11 is moved to the ending position, and the sliding structure 20 is brought into contact with the end of the heat exchanger tube again, maintaining the same position relative to the measuring rod 10. Finally, the length between the two recorded positions of the sliding structure 20 is the length between the starting and ending positions of the heat exchanger tube, which is the length of the heat exchanger tube. In this way, there is no need to mark the position inside the heat exchanger tube; the expansion length is obtained directly by measuring the position of the sliding structure 20, resulting in smaller errors and improved overall work efficiency.

[0046] In some embodiments of this application, see [reference] Figure 2 The measuring rod 10 has a length scale line 12 extending along its longitudinal direction. The length scale line 12 marks the position of the sliding structure 20 relative to the measuring rod 10. In actual use, when the measuring head 11 extends into the pipe 30, the sliding structure 20 moves on the measuring rod 10. The user can directly obtain the length of the measuring head 11 extending into the pipe 30 by reading the length scale line 12. This allows the user to obtain the real-time position of the measuring head 11 within the pipe 30 through the length scale line 12. Combined with the pipe 30 diameter read by the measuring head 11 itself, the user can display the real-time inner diameter change pattern and obtain more valuable information from the test data.

[0047] Beneficial effect: When the inner diameter detection device is used to detect the expansion joint size of the heat exchange tube, the position of the sliding structure 20 can be directly marked by the length scale. For example, when the measuring head 11 detects the starting position of the heat exchange tube expansion joint, the reading of the length scale line 12 corresponding to the sliding structure 20 is A. When the measuring head 11 detects the ending position of the heat exchange tube expansion joint, the degree of the length scale line 12 corresponding to the sliding structure 20 is B. The difference between B and A is the length of the heat exchange tube expansion joint. In this way, the expansion joint length of the heat exchange tube can be obtained quickly.

[0048] In some embodiments, the sliding structure 20 is further provided with a precision scale line 21. During the movement of the sliding structure 20 on the measuring rod 10, it has an initial position closest to the measuring head 11. When the sliding structure 20 is in the initial position, the starting point of the precision scale line 21 is aligned with the starting point of the length scale line 12, and the extension directions of the precision scale line 21 and the length scale line 12 are the same.

[0049] Beneficially, the precision scale 21, being a tenth or hundredth degree scale, works in conjunction with the length scale 12, allowing for more accurate readings of the sliding structure 20 on the length scale 12. This, in turn, makes the insertion length of the measuring head 11 read through the sliding structure 20 more precise. When the inner diameter detection device is used to detect the expansion joint dimensions of the heat exchanger tube, the precision scale 21 ensures that the final obtained expansion joint length of the heat exchanger tube is also more accurate, helping to reduce detection errors.

[0050] In some embodiments, the plane where the sliding structure 20 abuts against the end of the pipe 30 is defined as the reference plane, and the measuring head 11 has a measuring point for contacting the inner wall of the pipe 30 to obtain the value of the inner diameter of the pipe 30.

[0051] When the sliding structure 20 is in its initial position, the measuring point can be located within the extension surface of the reference plane. At this time, the sliding structure 20 can be a cover structure, surrounding the entire measuring head 11. When the sliding structure 20 abuts against the end of the pipe 30, the measuring point of the measuring head 11 is located at the inlet of the pipe 30. As the measuring head 11 extends into the pipe 30, the sliding structure 20 will move along the measuring rod 10 in a direction away from the measuring head 11.

[0052] In this embodiment, to facilitate user reading, the starting point of the length scale line 12 is 0. This is beneficial because when the measuring head 11 extends into the pipe 30, the length will be the same as the distance the sliding structure 20 moves from its initial position. At this time, the user can directly read the position of the sliding structure 20 on the length scale line 12 to obtain the length of the measuring head 11 extending into the pipe 30.

[0053] In some other embodiments, the sliding structure 20 may not need to wrap the measuring head 11, thereby reducing the size of the sliding structure 20. In this case, the sliding structure 20 and the measuring head 11 can be set separately. When the sliding structure 20 is in the initial position, the sliding structure 20 and the measuring head 11 have a certain initial distance in the longitudinal direction of the measuring rod 10. This initial distance is L1. It can be understood that when the sliding structure 20 is in the initial position, the starting point of the corresponding length scale line 12, L1 is also the distance from the starting point of the length scale line 12 to the measuring point of the measuring head 11.

[0054] The starting point of the length scale line is marked with a reading of L1, which represents the distance L1 that the measuring head 11 has extended into the pipe 30 when the sliding structure 20 is in its initial position. As a benefit, subsequent length scale lines 12 increase sequentially from L1, allowing users to directly determine the length of the measuring head 11 extending into the pipe 30 based on the readings of the sliding structure 20 on the length scale lines 12.

[0055] In some embodiments, in order to facilitate the user's viewing of the length scale line 12, the sliding structure 20 has a sliding hole 22 and an observation hole 23. The measuring rod 10 passes through the sliding hole 22, the observation hole 23 is connected to the sliding hole 22, and the axis of the observation hole 23 intersects the axis of the sliding hole 22.

[0056] When the sliding structure 20 is in the initial position, the projection of the observation hole 23 onto the measuring rod 10 covers the starting point of the length scale line 12, and the precision scale line 21 is set around the edge of the observation hole 23. That is, when the sliding structure 20 is in the initial position, the user can see the scale reading of the starting point of the precision scale line 21 through the observation hole 23.

[0057] The beneficial effect is that the observation hole 23 allows the user to easily observe the alignment effect of the length scale line 12 and the precision scale line 21. Specifically, when the measuring head 11 is inserted into the pipe 30, the sliding structure 20 can move on the measuring rod 10 through the sliding hole 22. At this time, the sliding hole 22 will move along the precision scale line 21. The farther the sliding structure 20 is from the measuring head 11, the farther the sliding hole 22 is from the starting point of the precision scale line 21. At this time, the user can see a larger reading of the precision scale line 21 through the observation hole 23. At the same time, by aligning the precision scale line 21 on the edge of the observation hole 23 with the length scale line 12 seen in the observation hole 23, the specific length between the sliding structure 20 and the measuring head 11 can be obtained, thereby obtaining the specific length of the measuring head 11 inserted into the pipe 30.

[0058] In some specific embodiments, a transparent protective element is provided inside the observation hole 23. The protective element can be glass or transparent plastic. The beneficial effect is that by shielding the observation hole 23 with the protective element, while ensuring the user can read the value normally through the observation hole 23, it prevents debris, dust, etc., from entering the sliding hole 22 through the observation hole 23 and affecting the normal movement of the sliding structure 20 within the sliding hole 22.

[0059] In some specific embodiments, the observation hole 23 is a strip-shaped hole, with its longitudinal direction parallel to that of the measuring rod 10. The advantage is that the strip-shaped hole allows more length scale lines 12 to be observed, effectively complementing the precise tenths or hundredths scale lines 21, enabling the measuring head 11 to be positioned within the pipe 30 with an accuracy to two or three decimal places.

[0060] In some embodiments of this application, the sliding structure 20 includes a slider 24 and a locking member 25. The slider 24 is movably disposed on the measuring rod 10 along its longitudinal direction. The locking member 25 is disposed on the slider 24 and can be controlled to lock or disengage from the measuring rod 10. When the slider 24 moves to any position relative to the measuring rod 10, the locking member 25 can lock with the measuring rod 10 and prevent the slider 24 from continuing to move. The slider 24 is provided with the aforementioned observation hole 23 and precision scale line 21.

[0061] Beneficial effect: When the inner diameter detection device is used to detect the expansion length of the heat exchange tube, the measuring head 11 detects the start or end position of the expansion of the heat exchange tube, and when the sliding member 24 abuts against the end of the heat exchange tube, the sliding member 24 can be locked in the current position by the locking member 25. This makes it easier for the user to observe the correspondence between the precision scale line 21 and the length scale line 12, thereby obtaining the specific length of the sliding member 24 relative to the measuring head 11, the length of the measuring head 11 inserted into the heat exchange tube, and finally the expansion length of the heat exchange tube.

[0062] In some embodiments, the sliding member 24 has a sliding hole 22 and a threaded hole 26. The measuring rod 10 passes through the sliding hole 22, and the threaded hole 26 is connected to the sliding hole 22, with the axis of the threaded hole 26 intersecting the axis of the sliding hole 22. The locking member 25 is threadedly connected to the threaded hole 26, and during the movement of the locking member 25 along the threaded hole 26, the locking member 25 can abut against or separate from the measuring rod 10.

[0063] The beneficial effect is that when the user needs to lock the locking element 25 and the measuring rod 10, the locking element 25 can be rotated to move within the threaded hole 26, allowing it to extend into the sliding hole 22 and abut against the measuring rod 10. This presses the locking element 25 against the measuring rod 10, thus locking the locking element 25 and the measuring rod 10 together. Conversely, when it is necessary to separate the locking element 25 from the measuring rod 10, simply rotate the locking element 25 in the opposite direction until they separate. Therefore, locking and separating the locking element 25 and the measuring rod 10 only requires rotating the locking element 25, which is convenient, quick, and easy for the user to operate.

[0064] In some specific embodiments, the locking member 25 has a hand-tightening part 27 at the end away from the measuring rod 10, and the circumferential surface of the hand-tightening part 27 is provided with anti-slip texture 28. The beneficial effect is that the hand-tightening part 27 allows the user to directly rotate the locking member 25 by hand, without needing to use tools such as screwdrivers or wrenches, thus improving the ease of operation of the inner diameter detection device.

[0065] It is understood that in some other embodiments, the locking member 25 can also be a clamp, which locks the measuring rod 10 by tightening. The locking member 25 can be any existing structure with locking function, and is not limited here.

[0066] In some embodiments of this application, the inner diameter detection device further includes an indicator 13, which is located at the other end of the measuring rod 10 along its longitudinal direction and is used to display the measurement data of the measuring head 11. The beneficial effect is that the user can see the diameter data inside the pipe 30 through the indicator 13, and see the data of the measuring head 11 extending into the pipe 30 through the sliding structure 20 and the length scale line 12. This allows for simultaneous and accurate reading of both the inner diameter detection value and the insertion length value. On the one hand, this greatly improves the detection efficiency of pipe expansion inspection; on the other hand, because it solves the problem of data reading lag, it can display the inner diameter change pattern in real time, enabling the acquisition of more valuable information from the detection data.

[0067] Optionally, the indicator 13 is a dial indicator, and the measuring head 11 is a spring-loaded measuring head 11. It is understood that in some other embodiments, the indicator 13 may also be a display screen, and the measuring head 11 may also be a steel ball-loaded measuring head 11. The indicator 13 and the measuring head 11 can be selected according to actual needs, and are not limited here.

[0068] In some embodiments of this application, the inner diameter measuring device further includes a handle 14, one end of which is located at the other end of the measuring rod 10 along its longitudinal direction, and an indicator 13 is located at the other end of the handle 14. The advantage is that the handle 14 allows the user to easily hold the inner diameter measuring device, thus facilitating the insertion of the measuring head 11 into the pipe 30. In actual use, the surface of the handle 14 can be covered with leather or similar materials to improve the user experience.

[0069] This application also provides a detection device, including the inner diameter detection device in any of the above embodiments. The detection device may also include a processing unit. The detection data of the measuring head 11 is directly transmitted to the processing unit. The amount of movement of the sliding structure 20 relative to the measuring head 11 can also be detected by a distance sensor or the like and input to the processing unit. The processing unit can not only record various types of data, but also analyze various types of data to obtain information such as the inner diameter change pattern of the pipe 30.

[0070] The following combination Figure 3 The working process of the inner diameter measuring device in this application is described as follows:

[0071] Step 1: Select the appropriate range indicator 13, the appropriate length measuring rod 10, and the appropriate specification measuring head 11 according to the usage requirements;

[0072] Step 2: Measure and record the distance L1 from the measuring point on the measuring head 11 to the starting point of the length scale line 12 on the measuring rod 10;

[0073] Step 3: Insert the measuring head 11 end of the device into the heat exchange tube to be tested, locate the position to be tested, and read the inner diameter value;

[0074] Step 4: Press the reference surface of the sliding structure 20 against the end face of the heat exchange tube, and read the distance L2 of the sliding structure 20 deviating from the reference line;

[0075] Step 5: Measure the height L3 of the heat exchange tubes extending out of the tube sheet 31;

[0076] Step 6: L1 + L2 - L3 is the insertion length of the measuring head 11;

[0077] It should be noted that in actual use, the surface of tube sheet 31 is often used as the reference surface for the installation of heat exchange equipment. Therefore, the height L3 of the heat exchange tubes extending out of tube sheet 31 needs to be removed during calculation to ensure the consistency of the calculation results.

[0078] The above-mentioned inner diameter measuring device has at least the following advantages:

[0079] When the inner diameter measuring device is used to detect the expansion length of a heat exchanger tube, the measuring head 11 is first inserted into the heat exchanger tube to measure its diameter, and the starting and ending positions of the expansion are confirmed by the diameter. Then, when the measuring head 11 is in the starting position, the sliding structure 20 is brought into contact with the end of the heat exchanger tube, and the position of the sliding structure 20 relative to the measuring rod 10 is recorded. Next, the measuring head 11 is moved to the ending position, and the sliding structure 20 is brought into contact with the end of the heat exchanger tube again, maintaining the same position relative to the measuring rod 10. Finally, the length between the two recorded positions of the sliding structure 20 is the length between the starting and ending positions of the heat exchanger tube, which is the length of the heat exchanger tube. In this way, there is no need to mark the position inside the heat exchanger tube; the expansion length is obtained directly by measuring the position of the sliding structure 20, resulting in smaller errors and improved overall work efficiency.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An inner diameter detection device, characterized in that, The inner diameter detection device includes: Measuring rod (10); A measuring head (11) is located at one end of the measuring rod (10) in its longitudinal direction and is used to extend into the pipe (30) to measure the inner diameter of the pipe (30); A sliding structure (20) is movably disposed on the measuring rod (10) along the longitudinal direction of the measuring rod (10), and when the measuring head (11) is inserted into the pipe (30), the sliding structure (20) can abut against the end of the pipe (30).

2. The inner diameter detection device according to claim 1, characterized in that, The measuring rod (10) has a length scale line (12) that extends along the longitudinal direction of the measuring rod (10) and is used to mark the position of the sliding structure (20) relative to the measuring rod (10).

3. The inner diameter detection device according to claim 2, characterized in that, The sliding structure (20) is also provided with a precision scale line (21). During the movement of the sliding structure (20) on the measuring rod (10), it has an initial position closest to the measuring head (11). When the sliding structure (20) is in the initial position, the starting point of the precision scale line (21) is aligned with the starting point of the length scale line (12), and the extension directions of the precision scale line (21) and the length scale line (12) are the same.

4. The inner diameter detection device according to claim 3, characterized in that, The precision scale line (21) is a tenth or hundredth scale line.

5. The inner diameter detection device according to claim 3, characterized in that, The sliding structure (20) has a sliding hole (22) and an observation hole (23). The measuring rod (10) passes through the sliding hole (22). The observation hole (23) is connected to the sliding hole (22), and the axis of the observation hole (23) intersects the axis of the sliding hole (22). When the sliding structure (20) is in the initial position, the projection of the observation hole (23) on the measuring rod (10) covers the starting point of the length scale line (12), and the precision scale line (21) is set around the edge of the observation hole (23).

6. The inner diameter detection device according to claim 5, characterized in that, A transparent protective element is provided inside the observation hole (23).

7. The inner diameter detection device according to claim 5, characterized in that, The observation hole (23) is a strip-shaped hole, and the longitudinal direction of the strip-shaped hole is parallel to the longitudinal direction of the measuring rod (10).

8. The inner diameter detection device according to claim 2, characterized in that, The starting point of the length scale line (12) has a scale reading of 0.

9. The inner diameter detection device according to claim 2, characterized in that, The scale reading at the starting point of the length scale line (12) is L1, where L1 is the distance from the starting point of the length scale line (12) to the measuring point of the measuring head (11) on the measuring rod (10) in its longitudinal direction.

10. The inner diameter detection device according to claim 1, characterized in that, The sliding structure (20) includes a sliding member (24) and a locking member (25). The sliding member (24) is movably disposed on the measuring rod (10) along the longitudinal direction of the measuring rod (10). The locking member (25) is provided on the sliding member (24), and the locking member (25) can be controlled to lock or separate from the measuring rod (10). When the sliding member (24) moves to any position relative to the measuring rod (10), the locking member (25) can lock with the measuring rod (10) and prevent the sliding member (24) from continuing to move.

11. The inner diameter detection device according to claim 10, characterized in that, The sliding member (24) has a sliding hole (22) and a threaded hole (26). The measuring rod (10) passes through the sliding hole (22). The threaded hole (26) is connected to the sliding hole (22), and the axis of the threaded hole (26) intersects the axis of the sliding hole (22). The locking member (25) is threadedly connected to the threaded hole (26), and during the movement of the locking member (25) along the threaded hole (26), the locking member (25) can abut against or separate from the measuring rod (10).

12. The inner diameter detection device according to claim 11, characterized in that, The locking member (25) has a hand-tightening part (27) at one end away from the measuring rod (10), and the circumferential surface of the hand-tightening part (27) is provided with anti-slip texture (28).

13. The inner diameter detection device according to claim 1, characterized in that, The inner diameter detection device also includes an indicator (13), which is located at the other end of the measuring rod (10) in its longitudinal direction and is used to display the measurement data of the measuring head (11).

14. The inner diameter detection device according to claim 13, characterized in that, The inner diameter detection device also includes a grip handle (14), one end of which is located at the other end of the measuring rod (10) in its longitudinal direction, and the indicator (13) is located at the other end of the grip handle (14).

15. A testing device, characterized in that, Includes the inner diameter detection device as described in any one of claims 1-14.

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