Auxiliary device and method for measuring relevant dimensions of sleeve hole of electric heating element

Abstract

The invention discloses an auxiliary device and a measuring method for measuring the related size of a sleeve hole of an electric heating element, one end of the device is provided with a plug-in measuring rod with tolerance requirements for detecting the diameter of the sleeve hole of the electric heating element, and the other end of the device is provided with a reflection ball positioning device which is cooperatively connected with the device. By setting the dimensional tolerance matching precision of the measuring rod and the reflecting ball positioning device, the reflecting ball is limited at the most appropriate position, and the central position of the reflecting ball is accurately measured, so that the center of the sleeve hole of the electric heating element is obtained, and the hole diameter, the position degree and the perpendicularity of the sleeve hole can be measured at a time through the measuring device. According to the method, measurement can be carried out when the equipment is placed at any position, the placement position of the equipment is not limited, and due to the fact that the measuring rod and the reflection ball positioning device are detachably matched, the detection efficiency is improved, the manufacturing cost is reduced, and the measurement efficiency and accuracy are greatly improved.

Description

Technical Field

[0001] The present invention relates to an auxiliary device and a method for measuring the relevant dimensions of the casing hole of an electric heating element at the bottom of a pressurizer lower head, and in particular to an auxiliary device and a method for measuring the aperture, position and verticality of the casing hole of the electric heating element. Background Art

[0002] The lower head is a crucial component of the voltage stabilizer. Its bottom contains 78 holes for the electric heating element casings, posing a significant inspection burden. Due to its characteristics and manufacturing process, drilling and measurement must be performed while the head is in a vertical position, with the axis of the holes parallel to the ground. Furthermore, these holes have strict requirements for aperture, position, and verticality. Using existing technology for measurement is complex and inaccurate, and requires high skill from the operator placing the reflective balls, which can easily fall if not handled with care, resulting in casualties and equipment damage.

[0003] The existing method for measuring the diameter of the casing hole of an electric heating element is to use an internal diameter micrometer to measure three positions in the longitudinal direction, and measure each position twice in a cross shape to obtain the average size of the inner diameter of the casing hole. This method is time-consuming and labor-intensive, because the limited location and number of sampling points can easily lead to missed detections.

[0004] The existing method for measuring the position of the casing hole of an electric heating element involves placing the equipment's built-in target holder into the hole and sampling points on the top, bottom, left, and right sides of the hole. This point is then fitted to the center of a circle, which serves as the center of the casing hole. This method requires sampling four points per hole, which is extremely time-consuming. Furthermore, the need to manually position the target holder makes it difficult to control operator error. Furthermore, this method cannot measure verticality; conventional verticality measurement methods must be used to measure the verticality of each hole one by one.

[0005] In summary, it is worth exploring and studying how to complete the detection task more efficiently, accurately and safely while ensuring the detection accuracy of the equipment. Summary of the Invention

[0006] In order to overcome the above problems, the inventors have conducted intensive research and designed an auxiliary device and measurement method for measuring the relevant dimensions of the sleeve hole of an electric heating element. In the device, a number of insertable measuring rods of appropriate sizes are provided, and the precise fit between the measuring rods and the reflective ball fixing seat is adjusted to confine the reflective ball to the most suitable position. By measuring the center position of the reflective ball, the axis of the sleeve hole of the electric heating element where it is located is obtained, thereby greatly improving the detection efficiency, reducing adverse factors such as measurement errors and human operation deviations, and greatly improving the efficiency and accuracy of the measurement; thus completing the present invention.

[0007] Specifically, the object of the present invention is to provide an auxiliary device for measuring relevant dimensions of the casing hole of an electric heating element, wherein the relevant dimensions include hole diameter, position and verticality;

[0008] The auxiliary device includes a measuring rod 1, a reflective ball fixing seat 2, a locking nut 3 and a top screw 4;

[0009] One end of the measuring rod 1 can be inserted into the sleeve hole of the electric heating element, and the other end of the measuring rod 1 is installed with a reflective ball fixing seat 2 carrying a reflective ball and a locking nut 3, so as to achieve the fixed installation of the reflective ball 5. The center position coordinates of the reflective ball 5 can be directly measured by the laser tracker, and then the center position coordinates of the sleeve hole of the electric heating element can be obtained.

[0010] In which, the measuring rod 1 includes a cylindrical main body 11, and a rough section 13 for hand-held operation is provided at the end of the measuring rod main body 11; a blind hole 15 is opened at the end of the rough section 13, and the reflective ball fixing seat 2 is connected through the blind hole 15, and the axes of the measuring rod main body 11, the blind hole 15 and the reflective ball fixing seat 2 coincide.

[0011] The reflective ball fixing seat 2 is cylindrical with one end being thin and the other end being thick. The thin end of the reflective ball fixing seat 2 is a thin cylindrical section 21, and the thin cylindrical section 21 can extend into the blind hole 15.

[0012] A conical hole 23 for accommodating the reflecting ball is provided on the thick end of the reflecting ball fixing seat 2.

[0013] An external thread 22 is provided on the outer side of the thick end of the reflective ball fixing seat 2;

[0014] An internal thread 31 is provided on the inner side of the locking nut 3, and the locking nut 3 is fixed to the outer side of the conical hole 23 by screwing the external thread 22 and the internal thread 31 together;

[0015] The locking nut 3 and the conical hole 23 together accommodate and fix the reflective ball 5;

[0016] Preferably, an opening 32 is provided at the end of the locking nut 3 , and the size of the opening 32 is set based on the size of the reflecting ball 5 , so that the reflecting ball 5 cannot fall through the opening 32 and allows receiving the laser reflected beam.

[0017] The measuring rod 1 is provided with a variety of specifications, and the outer diameter of the measuring rod body 11 on each specification of the measuring rod 1 is different;

[0018] The outer diameter of the measuring rod body 11 is within the tolerance range of the aperture of the casing hole of the electric heating element to be measured;

[0019] Preferably, the outer diameter of each size specification differs by 0.01 mm; the tolerance of the outer diameter of each measuring rod body 11 is ±0.002 mm.

[0020] Wherein, 2 to 4 threaded through holes 14 are provided in the circumferential direction of the hole wall of the blind hole 15.

[0021] There are 2 to 4 positioning holes 25 in the circumferential direction of the thin cylindrical section 21 of the reflective ball seat 2.

[0022] When the reflective ball holder 2 is installed at the predetermined position of the measuring rod 1, the threaded through hole is aligned with the positioning hole 25; the top screw 4 passes through the threaded through hole and then extends into the positioning hole 25 to fix the measuring rod 1 and the reflective ball holder 2;

[0023] Preferably, the size and tolerance of the thin cylindrical section 21 are set so that its axis coincides with the axis of the measuring rod 1 .

[0024] Preferably, a first scale line 12 is engraved on the end face of the measuring rod 1;

[0025] A second scale line 24 is engraved on the reflective ball fixing seat 2;

[0026] During the process of installing the reflective ball fixing base 2 on the measuring rod 1 , when the first scale line 12 and the second scale line 24 are aligned, the reflective ball fixing base 2 is installed to a predetermined position of the measuring rod 1 .

[0027] Preferably, the central angle α corresponding to the conical hole 23 is set based on the size of the reflective ball 5 to ensure smooth installation of the reflective ball 5;

[0028] Preferably, the central angle α corresponding to the conical hole 23 is 70 to 90 degrees, more preferably 80 degrees.

[0029] Preferably, by setting the shape and position tolerance of the conical hole 23, the axis of the reflective ball fixing seat 2 passes through the center of the reflective ball 5;

[0030] Preferably, on the locking nut 3 , both the bottom and the opening end of the conical hole 23 are chamfered, that is, rounded corners 33 are provided.

[0031] The present invention also provides a method for measuring the diameter and position of a casing hole of an electric heating element, which is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element as described above;

[0032] Preferably, the method comprises the following steps:

[0033] Step 1: Determine the number of measuring rods 1, the outer diameter size and tolerance of the measuring rod body 11 based on the size and tolerance of the electric heating element sleeve hole. Also, determine the central angle of the conical hole 23 on the reflective ball holder 2 and the size of the opening 32 on the locking nut 3 based on the outer diameter of the reflective ball.

[0034] Step 2: Place the reflective ball 5 into the reflective ball holder 2, adjust it to a suitable position, and then install the locking nut 3;

[0035] Step 3: Select and insert the measuring rods 1 one by one and place them into the casing hole of the electric heating element. Select the measuring rod that can be inserted smoothly without sticking or shaking as the matching measuring rod. The outer diameter of the measuring rod 1 is the same as the hole diameter of the casing hole of the electric heating element. Continue to place the matching measuring rod in the casing hole of the electric heating element.

[0036] Step 4: Place the reflective ball holder 2 into the blind hole 15 at the end of the measuring rod. When the first scale line 12 and the second scale line 24 are aligned, secure the reflective ball holder 2 by tightening the top screw 4.

[0037] Step 5: Use a laser tracker to directly measure the center coordinates of the reflective ball 5, which are the center coordinates of the casing hole of the electric heating element, and record and reflect the center coordinates through the SA software;

[0038] Step 6, repeat steps 3, 4 and 5, and obtain the center position coordinates of each electric heating element sleeve hole one by one through SA software, and then obtain the actual position of all electric heating element sleeve holes.

[0039] The present invention also provides a method for measuring the verticality of a casing hole of an electric heating element, which is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element as described above;

[0040] Preferably, the method comprises the following steps:

[0041] Step 1: Determine the number of measuring rods 1, the outer diameter size and tolerance of the measuring rod body 11 based on the size and tolerance of the electric heating element sleeve hole. Also, determine the central angle of the conical hole 23 on the reflective ball holder 2 and the size of the opening 32 on the locking nut 3 based on the outer diameter of the reflective ball.

[0042] Step 2: Place the reflective ball 5 into the reflective ball holder 2, adjust it to a suitable position, and then install the locking nut 3;

[0043] Step 3: Select and insert the measuring rods 1 one by one and place them into the casing hole of the electric heating element. Select the measuring rod that can be inserted smoothly without sticking or shaking as the matching measuring rod. The outer diameter of the measuring rod 1 is the same as the hole diameter of the casing hole of the electric heating element. Continue to place the matching measuring rod in the casing hole of the electric heating element.

[0044] Step 4: Place the reflective ball holder 2 into the blind hole 15 at the end of the measuring rod. When the first scale line 12 and the second scale line 24 are aligned, secure the reflective ball holder 2 by tightening the top screw 4.

[0045] Step 5: directly measure the center coordinates of the reflective ball 5 using a laser tracker. The center coordinates of the reflective ball 5 are the center coordinates of the tube hole.

[0046] Step 6: Pull the matching measuring rod out of the sleeve hole of the electric heating element by a certain distance, and ensure that more than half of the main measuring rod 11 is still in the hole, and measure the center position coordinates of the reflective ball 5 again using the laser tracker.

[0047] Step 7: Obtain the tube hole axis based on the line connecting the two measured center position coordinates of the reflecting sphere, and obtain the verticality of the casing hole of the electric heating element in combination with the position coordinates of the upper surface of the tube plate.

[0048] The beneficial effects of the present invention include:

[0049] (1) The auxiliary device and method for measuring the dimensions of the casing hole of an electric heating element provided by the present invention have a novel structure, are simple to manufacture, and are low in cost. The measuring rod and the reflective ball fixing seat are concentric with the casing hole of the electric heating element, so that the center of the reflective ball is on the reference plane, resulting in high measurement accuracy.

[0050] (2) The auxiliary device and method for measuring the dimensions of the casing hole of an electric heating element provided by the present invention are compact in structure, can realize the vertical position of the lower head, and can perform measurements with the measuring axis parallel to the ground, thus ensuring that the reflective ball does not fall. The measurement elements are completed in one go and have a wide range of applications.

[0051] (3) The auxiliary device and measurement method for measuring the relevant dimensions of the casing hole of the electric heating element provided by the present invention can be used to measure different form and position tolerances, and can be measured in multiple directions and angles without being restricted by the placement of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram showing the structure of an auxiliary device for measuring relevant dimensions of a casing hole of an electric heating element provided by the present application;

[0053] Figure 2 A schematic diagram showing a measuring rod in an auxiliary device for measuring dimensions of a casing hole of an electric heating element provided in the present application;

[0054] Figure 3 A schematic diagram of a reflective ball fixing seat in an auxiliary device for measuring dimensions of a casing hole of an electric heating element provided in the present application is shown;

[0055] Figure 4 A schematic diagram showing a locking nut in an auxiliary device for measuring dimensions of a casing hole of an electric heating element provided in the present application;

[0056] Figure 5 A schematic diagram showing the assembly and matching of the auxiliary device for measuring the relevant dimensions of the sleeve hole of the electric heating element provided in the present application is shown.

[0057] Description of Reference Numerals

[0058] 1-Measuring stick

[0059] 11-Measuring rod body

[0060] 12-First scale line

[0061] 13-Rough segment

[0062] 14-Threaded through hole

[0063] 15-Blind hole

[0064] 2-Reflection ball fixing seat

[0065] 21-thin cylindrical segment

[0066] 22-External thread

[0067] 23-conical hole

[0068] 24-Second scale line

[0069] 25-Positioning hole

[0070] 3-lock nut

[0071] 31-Internal thread

[0072] 32-Opening

[0073] 33-Rounded Corners DETAILED DESCRIPTION

[0074] The present invention will be described in further detail below with reference to the accompanying drawings and examples, through which the features and advantages of the present invention will become more clearly understood.

[0075] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0076] The present invention provides an auxiliary device for measuring the relevant dimensions of the casing hole of an electric heating element, such as Figures 1 to 5As shown in , the relevant dimensions include aperture, position and verticality; the measurement of the aperture, position and verticality of the electric heating element sleeve hole is specifically measured by a laser tracker equipped with a reflecting ball. The electric heating element sleeve hole aperture measurement described in this application is achieved by providing a measuring rod of appropriately sized insertable type in the device; the electric heating element sleeve hole position and verticality measurement described in this application is achieved by adjusting the precise fit between the measuring rod and the reflecting ball fixing seat to limit the reflecting ball to the most suitable position. The center position of the reflecting ball is measured by the laser tracker to obtain the center of the electric heating element sleeve hole where it is located, and the position and verticality of the tube hole are measured.

[0077] The laser tracker may be a Radian Plus laser tracker manufactured by American Automatic Precision Engineering (API), and the reflective ball may be a reflective ball with a diameter of 12.7 mm.

[0078] The auxiliary device includes a measuring rod 1, a reflective ball fixing seat 2, a locking nut 3 and a top screw 4;

[0079] One end of the measuring rod 1 can be inserted into the sleeve hole of the electric heating element, and the other end of the measuring rod 1 is installed with a reflective ball fixing seat 2 carrying a reflective ball and a locking nut 3, so as to achieve the fixed installation of the reflective ball 5. The center position coordinates of the reflective ball 5 can be directly measured by the laser tracker, and then the center position coordinates of the sleeve hole of the electric heating element can be obtained.

[0080] Preferably, the measuring rod 1 includes a cylindrical body 11, with a slightly larger roughened section 13 (with a less precisely machined outer contour) at the end of the measuring rod body 11 for use in hand-held operation. A blind hole 15 is provided at the end of the roughened section 13, which connects to the reflective ball holder 2 through the blind hole 15. The axes of the measuring rod body 11, the blind hole 15, and the reflective ball holder 2 are aligned, thereby allowing the axis to pass through the center of the reflective ball. During the machining process of the measuring rod 1, the axes of the measuring rod body 11 and the blind hole 15 are ensured to be aligned.

[0081] Preferably, the reflective ball fixing seat 2 is cylindrical with one end being thin and the other end being thick, and the thin end of the reflective ball fixing seat 2 is a thin cylindrical section 21, and the thin cylindrical section 21 can extend into the blind hole 15;

[0082] A conical hole 23 for accommodating the reflecting ball is provided on the thick end of the reflecting ball fixing seat 2.

[0083] An external thread 22 is provided on the outer side of the thick end of the reflective ball fixing seat 2;

[0084] An internal thread 31 is provided on the inner side of the locking nut 3, preferably an M24 internal thread, and the locking nut 3 is fixed to the outer side of the conical hole 23 by screwing the external thread 22 and the internal thread 31 together;

[0085] The locking nut 3 and the conical hole 23 together accommodate and fix the reflective ball 5, and ensure that the reflective ball cannot move.

[0086] Preferably, an opening 32 is provided at the end of the locking nut 3. The size of the opening 32 is set based on the size of the reflective ball 5, so that the reflective ball 5 cannot fall through the opening 32 and allows the laser reflected beam to be received, that is, it can ensure that the reflective ball can guide the laser tracker to work normally.

[0087] In a preferred embodiment, the measuring rod 1 is provided in various sizes. The roughened section 13 of each size is consistent in structural dimensions, while the outer diameter of the measuring rod body 11 of each size is different. The length of the measuring rod body 11 can be arbitrarily set, as long as the length of the measuring rod body 11 is 1.2 to 1.5 times the depth of the hole to be measured, thereby ensuring that the measuring rod body 11 can still be radially restrained after being withdrawn a certain distance. The measuring rod body 11 has good roundness and straightness, thereby ensuring accurate measurement results.

[0088] The outer diameter of the measuring rod body 11 is within the tolerance range of the aperture of the casing hole of the electric heating element to be measured;

[0089] Preferably, the outer diameter of each size specification differs by 0.01 mm; the tolerance of the outer diameter of each measuring rod body 11 is ±0.002 mm.

[0090] For example, when the aperture of the object being measured is 32.940 0.08 When measuring in mm, based on the outer diameter of each measuring rod differing by 0.01 mm and a tolerance of ±0.002 mm, 9 types of measuring rods are required, each of which has a length of 210 mm, as shown in the following table:

[0091] Measuring rod number Dimensions ΦD×L(mm) Measuring rod number Dimensions ΦD×L(mm) DJR01 Φ32.94±0.002×210 DJR06 Φ32.99±0.002×210 DJR02 Φ32.95±0.002×210 DJR07 Φ33.00±0.002×210 DJR03 Φ32.96±0.002×210 DJR08 Φ33.01±0.002×210 DJR04 Φ32.97±0.002×210 DJR09 Φ33.02±0.002×210 DJR05 Φ32.98±0.002×210

[0092] In the present application, the diameter of the casing hole of the electric heating element is measured by setting a number of measuring rod bodies with different sizes and tolerance ranges.

[0093] In a preferred embodiment, 2 to 4 threaded through holes 14 are provided in the circumferential direction of the hole wall of the blind hole 15.

[0094] There are 2 to 4 positioning holes 25 in the circumferential direction of the thin cylindrical section 21 of the reflective ball seat 2.

[0095] When the reflective ball holder 2 is installed at the predetermined position of the measuring rod 1, the threaded through hole is aligned with the positioning hole 25; the top screw 4 passes through the threaded through hole and then extends into the positioning hole 25 to fix the measuring rod 1 and the reflective ball holder 2;

[0096] Preferably, the size and tolerance of the thin cylindrical section 21 are set so that its axis coincides with the axis of the measuring rod 1 .

[0097] More preferably, the outer diameter of the thin cylindrical section 21 of the reflecting ball fixing seat 2 is within the precision fitting tolerance range of the blind hole of the measuring rod 1; that is, the inner diameter of the blind hole of the measuring rod 1 is consistent with the outer diameter of the thin cylindrical section 21 of the reflecting ball fixing seat 2, and the outer diameter tolerance zone of the thin cylindrical section 21 of the reflecting ball fixing seat 2 is smaller than and completely falls within the inner diameter tolerance zone of the blind hole of the measuring rod 1, thereby ensuring that the reflecting ball fixing seat 2 can be inserted into the blind hole, and minimizing the gap between the two, thereby improving the coaxiality between the measuring rod 1 and the reflecting ball fixing seat 2.

[0098] Preferably, two threaded through holes 14 are symmetrically arranged in the circumferential direction of the hole wall of the blind hole 15 , and the hole wall thickness of the blind hole 15 is 10 mm, which can meet the installation and positioning strength.

[0099] Preferably, a first scale line 12 is engraved on the end face of the measuring rod 1;

[0100] A second scale line 24 is engraved on the reflective ball fixing seat 2;

[0101] During the process of installing the reflective ball fixing base 2 on the measuring rod 1 , when the first scale line 12 and the second scale line 24 are aligned, the reflective ball fixing base 2 is installed to a predetermined position of the measuring rod 1 .

[0102] In a preferred embodiment, the central angle α corresponding to the conical hole 23 is set based on the size of the reflective ball 5 to ensure smooth installation of the reflective ball 5;

[0103] Preferably, when the diameter of the reflective ball is 12.7 mm, the central angle α corresponding to the conical hole 23 is 70 to 90 degrees, more preferably 80 degrees, so that the spherical surface is tangent to the conical hole surface at the end of the reflective ball fixing seat.

[0104] Preferably, by setting the shape and position tolerance of the conical hole 23, the axis of the reflective ball fixing seat 2 passes through the center of the reflective ball 5;

[0105] Preferably, on the locking nut 3, the bottom and the opening end of the conical hole 23 are chamfered, that is, a rounded corner 33 is provided; after the locking nut is tightened, the rounded corner is tangent to the reflective ball, which is more conducive to the precise positioning of the center of the reflective ball.

[0106] The locking nut 3 should be made of nylon or other materials that are less likely to damage the reflective ball.

[0107] The present invention also provides a method for measuring the diameter and position of a casing hole of an electric heating element, which is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element as described above;

[0108] Preferably, the method comprises the following steps:

[0109] Step 1: Determine the number of measuring rods 1, the outer diameter size and tolerance of the measuring rod body 11 based on the size and tolerance of the electric heating element sleeve hole. Also, determine the central angle of the conical hole 23 on the reflective ball holder 2 and the size of the opening 32 on the locking nut 3 based on the outer diameter of the reflective ball.

[0110] Step 2: Place the reflective ball 5 into the reflective ball holder 2, adjust it to a suitable position, and then install the locking nut 3;

[0111] Step 3: Select and insert the measuring rods 1 one by one and place them into the casing hole of the electric heating element. Select the measuring rod that can be inserted smoothly without sticking or shaking as the matching measuring rod. The outer diameter of the measuring rod 1 is the same as the hole diameter of the casing hole of the electric heating element. Continue to place the matching measuring rod in the casing hole of the electric heating element.

[0112] Step 4: Place the reflective ball holder 2 into the blind hole 15 at the end of the measuring rod. When the first scale line 12 and the second scale line 24 are aligned, secure the reflective ball holder 2 by tightening the top screw 4.

[0113] Step 5: Use a laser tracker to directly measure the center coordinates of the reflective ball 5, which are the center coordinates of the casing hole of the electric heating element, and record and reflect the center coordinates through the SA software;

[0114] Step 6, repeat steps 3, 4 and 5, and obtain the center position coordinates of each electric heating element sleeve hole one by one through SA software, and then obtain the actual position of all electric heating element sleeve holes.

[0115] The present invention also provides a method for measuring the verticality of a casing hole of an electric heating element, which is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element as described above;

[0116] Preferably, the method comprises the following steps:

[0117] Step 1: Determine the number of measuring rods 1, the outer diameter size and tolerance of the measuring rod body 11 based on the size and tolerance of the electric heating element sleeve hole. Also, determine the central angle of the conical hole 23 on the reflective ball holder 2 and the size of the opening 32 on the locking nut 3 based on the outer diameter of the reflective ball.

[0118] Step 2: Place the reflective ball 5 into the reflective ball holder 2, adjust it to a suitable position, and then install the locking nut 3;

[0119] Step 3: Select and insert the measuring rods 1 one by one and place them into the casing hole of the electric heating element. Select the measuring rod that can be inserted smoothly without sticking or shaking as the matching measuring rod. The outer diameter of the measuring rod 1 is the same as the hole diameter of the casing hole of the electric heating element. Continue to place the matching measuring rod in the casing hole of the electric heating element.

[0120] Step 4: Place the reflective ball holder 2 into the blind hole 15 at the end of the measuring rod. When the first scale line 12 and the second scale line 24 are aligned, secure the reflective ball holder 2 by tightening the top screw 4.

[0121] Step 5: directly measure the center coordinates of the reflective ball 5 using a laser tracker. The center coordinates of the reflective ball 5 are the center coordinates of the tube hole.

[0122] Step 6: Pull the matching measuring rod out of the sleeve hole of the electric heating element by a certain distance, and ensure that more than half of the main measuring rod 11 is still in the hole, and measure the center position coordinates of the reflective ball 5 again using the laser tracker.

[0123] Step 7: Obtain the tube hole axis based on the line connecting the two measured center position coordinates of the reflecting sphere, and obtain the verticality of the casing hole of the electric heating element in combination with the position coordinates of the upper surface of the tube plate.

[0124] Example

[0125] During the manufacturing process of the voltage stabilizer, the 78 electric heating element casing holes at the bottom of the lower head were tracked using a RadianPlus laser tracker, a 12.7mm diameter reflective ball and Figures 1 to 5 The auxiliary device for measuring the relevant dimensions of the electric heating element sleeve hole shown in the figure is used to detect the aperture, position and verticality of the hole. The production index of the electric heating element sleeve hole is: aperture 32.940 0.08 mm;

[0126] Specifically, the aperture, position, and perpendicularity measurement methods include the following steps:

[0127] Step 1: Determine the number of measuring rods 1, the outer diameter size and tolerance of the measuring rod body 11 based on the size and tolerance of the electric heating element sleeve hole. Also, determine the central angle of the conical hole 23 on the reflective ball holder 2 and the size of the opening 32 on the locking nut 3 based on the outer diameter size of the reflective ball. The measuring rods are provided in nine sizes. The outer diameter sizes and tolerances of the measuring rod bodies corresponding to the nine sizes are as follows:

[0128] Measuring rod number Dimensions ΦD×L(mm) Measuring rod number Dimensions ΦD×L(mm) DJR01 Φ32.94±0.002×210 DJR06 Φ32.99±0.002×210 DJR02 Φ32.95±0.002×210 DJR07 Φ33.00±0.002×210 DJR03 Φ32.96±0.002×210 DJR08 Φ33.01±0.002×210 DJR04 Φ32.97±0.002×210 DJR09 Φ33.02±0.002×210 DJR05 Φ32.98±0.002×210

[0129] The central angle of the conical hole 23 is 80 degrees, and the size of the hole on the locking nut is φ12 0 -0.1 mm; the inner diameter and tolerance of the blind hole 15 on the measuring rod 1 is φ15 +0.02 0mm, its depth is 20±0.5mm; the outer diameter and tolerance of the thin cylindrical section of the reflective ball fixing seat is φ15 -0.02 -0.04 mm, its length is 18±0.5mm;

[0130] Step 2: Place the reflective ball 5 into the reflective ball holder 2, adjust it to a suitable position, and then install the locking nut 3;

[0131] Step 3: Select and insert the measuring rods 1 one by one and place them into the casing hole of the electric heating element. Select the measuring rod that can be inserted smoothly without sticking or shaking as the matching measuring rod. The outer diameter of the measuring rod 1 is the same as the hole diameter of the casing hole of the electric heating element. Continue to place the matching measuring rod in the casing hole of the electric heating element.

[0132] Step 4: Place the reflective ball holder 2 into the blind hole 15 at the end of the measuring rod. When the first scale line 12 and the second scale line 24 are aligned, secure the reflective ball holder 2 by tightening the top screw 4.

[0133] Step 5: Use a laser tracker to directly measure the center coordinates of the reflective ball 5, which are the center coordinates of the casing hole of the electric heating element, and record and reflect the center coordinates through the SA software;

[0134] Step 6: Pull the matching measuring rod out of the sleeve hole of the electric heating element by a certain distance, and ensure that more than half of the main measuring rod 11 is still in the hole, and measure the center position coordinates of the reflective ball 5 again using the laser tracker.

[0135] Step 7: Obtain the tube hole axis based on the line connecting the two measured center position coordinates of the reflecting sphere, and obtain the verticality of the casing hole of the electric heating element in combination with the position coordinates of the upper surface of the tube plate;

[0136] Step 8. Repeat steps 3, 4, 5, 6, and 7 to obtain the center coordinates of each electric heating element sleeve hole and the connecting line of the center coordinates of the two reflection balls in each sleeve hole one by one through SA software, and then obtain the actual position and verticality of all electric heating element sleeve holes.

[0137] It only took about 4 hours for three operators to complete the inspection of the above 78 holes, which shows that the auxiliary device and measurement method for measuring the relevant dimensions of the electric heating element sleeve holes provided in this application greatly reduce labor intensity and improve inspection efficiency.

[0138] Furthermore, 3 holes were randomly selected from 78 electric heating element casing holes and tested and verified using the traditional method.

[0139] The conventional scheme is as follows: (1) for the diameter measurement of the casing hole of the electric heating element, an internal diameter micrometer is used to measure three positions in the length direction, and each position is measured twice in a cross shape to obtain the average size of the inner diameter of the casing hole; (2) for the position measurement of the casing hole of the electric heating element, the target seat provided by the equipment is placed in the hole and a point is sampled at the top, bottom, left and right of the hole to fit the center of the circle. The center of the circle is the center of the casing hole; (3) for the verticality measurement of the casing hole of the electric heating element, the axis of each hole needs to be sampled one by one; first, the laser tracker samples three points on one side of the head respectively. The four points at the end of the hole are used to fit the center point of the cross-section circle. Then, the laser tracker is transferred to the other side of the head (opening end) through at least four fixed common points in space, and the center points of the four points at the other end of the three holes are collected to fit the center points of the cross-section circle. The data collected by the laser tracker on both sides of the head are unified into the same measurement coordinate system for calculation, and the axis of the hole is fitted through these two center points. Then, four reference points are collected on the end face of the large mouth of the head to fit the reference plane. Finally, the verticality value of each hole is obtained through the verticality data of each hole axis and the reference plane.

[0140] The measurement of the three randomly selected electric heating element casing holes took three operators one hour to complete, indicating that completing the 78 holes required a total of 13.5 hours. The verification results obtained using the traditional method were consistent with those obtained using the aforementioned method, demonstrating that the auxiliary device and method for measuring the dimensions of electric heating element casing holes provided in this application are accurate and reliable, and can significantly improve measurement efficiency.

[0141] The present invention has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On this basis, various replacements and improvements can be made to the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. An auxiliary device for measuring the relevant dimensions of the casing hole of an electric heating element, characterized in that: The relevant dimensions include aperture, position and verticality; The auxiliary device comprises a measuring rod (1), a reflective ball fixing seat (2), a locking nut (3) and a top screw (4); One end of the measuring rod (1) can be inserted into the sleeve hole of the electric heating element, and a reflecting ball fixing seat (2) carrying a reflecting ball and a locking nut (3) is installed on the other end of the measuring rod (1), thereby achieving fixed installation of the reflecting ball (5). The center position coordinates of the reflecting ball (5) can be directly measured by a laser tracker, and the center position coordinates of the sleeve hole of the electric heating element can be obtained.

2. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 1, characterized in that: The measuring rod (1) comprises a cylindrical main body (11), a rough section (13) for hand-held operation is provided at the end of the measuring rod main body (11); a blind hole (15) is provided at the end of the rough section (13), and a reflective ball fixing seat (2) is connected through the blind hole (15), so that the axes of the measuring rod main body (11), the blind hole (15) and the reflective ball fixing seat (2) coincide.

3. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 2, characterized in that: The reflective ball fixing seat (2) is cylindrical with one end being thin and the other end being thick, and the thin end of the reflective ball fixing seat (2) is a thin cylindrical section (21), and the thin cylindrical section (21) can extend into the blind hole (15); A conical hole (23) for accommodating the reflecting ball is provided on the thick end of the reflecting ball fixing seat (2). An external thread (22) is provided on the outer side of the thick end of the reflective ball fixing seat (2); An internal thread (31) is provided on the inner side of the locking nut (3), and the locking nut (3) is fixed to the outer side of the conical hole (23) by screwing the external thread (22) and the internal thread (31) together; The locking nut (3) and the conical hole (23) are used to accommodate and fix the reflective ball (5); Preferably, an opening (32) is provided at the end of the locking nut (3), and the size of the opening (32) is set based on the size of the reflecting ball (5), so that the reflecting ball (5) cannot fall through the opening (32) and allows the laser reflected beam to be received.

4. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 2, characterized in that: The measuring rod (1) is provided with a plurality of specifications, and the outer diameter of the measuring rod body (11) on each specification of the measuring rod (1) is different; The outer diameter of the measuring rod body (11) is within the tolerance range of the aperture size of the sleeve hole of the electric heating element to be measured; Preferably, the outer diameter of each size specification differs by 0.01 mm; and the tolerance of the outer diameter of each measuring rod body (11) is ±0.002 mm.

5. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 3, characterized in that: 2 to 4 threaded through holes (14) are provided in the circumferential direction of the hole wall of the blind hole (15). Two to four positioning holes (25) are provided in the circumferential direction of the thin cylindrical section (21) of the reflecting ball seat (2). When the reflective ball fixing seat (2) is installed at a predetermined position of the measuring rod (1), the threaded through hole is aligned with the positioning hole (25); the top screw (4) passes through the threaded through hole and then extends into the positioning hole (25) to fix the measuring rod (1) and the reflective ball fixing seat (2); Preferably, the size and tolerance of the thin cylindrical section (21) are set so that its axis coincides with the axis of the measuring rod (1).

6. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 5, characterized in that: Marking a first scale line (12) on the end surface of the measuring rod (1); Marking a second scale line (24) on the reflective ball fixing seat (2); During the process of installing the reflective ball fixing seat (2) on the measuring rod (1), when the first scale line (12) and the second scale line (24) are aligned, the reflective ball fixing seat (2) is installed at a predetermined position of the measuring rod (1).

7. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 3, characterized in that: The central angle α corresponding to the conical hole (23) is set based on the size of the reflective ball (5) to ensure smooth installation of the reflective ball (5); Preferably, the central angle α corresponding to the conical hole (23) is 70 to 90 degrees, more preferably 80 degrees.

8. The auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to claim 7, characterized in that: By setting the form and position tolerance of the conical hole (23), the axis of the reflective ball fixing seat (2) passes through the center of the reflective ball (5); Preferably, on the locking nut (3), the bottom and the opening end of the conical hole (23) are both rounded, that is, rounded corners (33) are provided.

9. A method for measuring the diameter and position of a casing hole of an electric heating element, characterized in that: The method is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to any one of claims 1 to 8; Preferably, the method comprises the following steps: Step 1: Determine the number of measuring rods (1), the outer diameter size and tolerance of the measuring rod body (11) based on the size and tolerance of the electric heating element sleeve hole, and simultaneously determine the central angle of the conical hole (23) on the reflecting ball fixing seat (2) and the size of the opening (32) on the locking nut (3) based on the outer diameter size of the reflecting ball; Step 2: Place the reflective ball (5) into the reflective ball holder (2), adjust it to a suitable position, and then install the locking nut (3); Step 3, select and insert the measuring rods (1) one by one, and place them into the casing hole of the electric heating element, select the measuring rod that can be inserted smoothly without jamming or shaking, and use it as the matching measuring rod. The outer diameter of the measuring rod (1) is the hole diameter of the casing hole of the electric heating element, and the matching measuring rod is continued to be placed in the casing hole of the electric heating element; Step 4, placing the reflective ball holder (2) into the blind hole (15) at the end of the matching measuring rod, and when the first scale line (12) and the second scale line (24) are aligned, fixing the reflective ball holder (2) by tightening the top screw (4); Step 5, directly measuring the center position coordinates of the reflective ball (5) by a laser tracker, which is the center position coordinates of the sleeve hole of the electric heating element, and recording and reflecting the center position coordinates by SA software; Step 6, repeat steps 3, 4 and 5, and obtain the center position coordinates of each electric heating element sleeve hole one by one through SA software, and then obtain the actual position of all electric heating element sleeve holes.

10. A method for measuring the verticality of a casing hole of an electric heating element, characterized in that: The method is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to any one of claims 1 to 8; Preferably, the method comprises the following steps: Step 1: Determine the number of measuring rods (1), the outer diameter size and tolerance of the measuring rod body (11) based on the size and tolerance of the electric heating element sleeve hole, and simultaneously determine the central angle of the conical hole (23) on the reflecting ball fixing seat (2) and the size of the opening (32) on the locking nut (3) based on the outer diameter size of the reflecting ball; Step 2: Place the reflective ball (5) into the reflective ball holder (2), adjust it to a suitable position, and then install the locking nut (3); Step 3, select and insert the measuring rods (1) one by one, and place them into the casing hole of the electric heating element, select the measuring rod that can be inserted smoothly without jamming or shaking, and use it as the matching measuring rod. The outer diameter of the measuring rod (1) is the hole diameter of the casing hole of the electric heating element, and the matching measuring rod is continued to be placed in the casing hole of the electric heating element; Step 4, placing the reflective ball holder (2) into the blind hole (15) at the end of the matching measuring rod, and when the first scale line (12) and the second scale line (24) are aligned, fixing the reflective ball holder (2) by tightening the top screw (4); Step 5, directly measuring the center position coordinates of the reflective ball (5) by using a laser tracker, and the position coordinates are the center position coordinates of the tube hole; Step 6: Pull the matching measuring rod out of the sleeve hole of the electric heating element by a certain distance, and ensure that more than half of the main measuring rod (11) is still in the hole, and measure the center position coordinates of the reflecting ball (5) again by the laser tracker. Step 7: Obtain the tube hole axis based on the line connecting the two measured center position coordinates of the reflecting sphere, and obtain the verticality of the casing hole of the electric heating element in combination with the position coordinates of the upper surface of the tube plate.

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