Oxygen bomb thread axial looseness detection method and device

Abstract

The invention relates to an oxygen bomb thread axial loosening degree detection method, and the method comprises the steps: building at least one pair of online projection image measuring instruments at two sides of an oxygen bomb in a horizontal plane, obtaining the orthographic projection of the outline of the oxygen bomb, driving the oxygen bomb to carry out the intermittent in-situ rotation around the axis at a set angle, in the intermittent process, thrust is applied to the axial direction of the oxygen bomb connecting ring to a set value, the displacement of a plurality of first measuring points on the projection of the oxygen bomb connecting ring before and after the thrust is applied is obtained based on the online projection image measuring instrument, finally, the average is calculated based on the displacement, and the axial looseness degree of the oxygen bomb thread is output.

Description

Technical Field

[0001] This application belongs to the technical field of oxygen bomb detection, and particularly relates to a method and device for detecting the axial looseness of the threads of an oxygen bomb. Background Art

[0002] An oxygen bomb calorimeter is an instrument used to measure the calorific value of substances that can burn completely in oxygen. As the combustion chamber of the oxygen bomb calorimeter, the oxygen bomb needs to withstand the high-temperature and high-pressure environment generated during the combustion process of the internal sample. The oxygen bomb usually consists of a cover body, a bomb body, and a connecting ring used to fix the cover body by screwing it to the bomb body. To ensure that the oxygen bomb can safely complete the measurement of the calorific value of the sample, it is necessary to detect the thread looseness of the oxygen bomb regularly or before the experiment.

[0003] In the prior art, the axial looseness of the threads of the oxygen bomb is measured by the test device in MT / T 737-2007 "Calorimeter Oxygen Bomb Safety Performance Inspection Specification". This experimental device includes a measurement platform; an oxygen bomb fixing frame arranged on the measurement platform for fixing the oxygen bomb; an experimental ring for moving the threaded connection ring of the oxygen bomb; and a micrometer for measuring the axial looseness of the threads of the oxygen bomb. Although this device can meet the basic measurement of the oxygen bomb, during the process of measuring the axial looseness of the threads of the oxygen bomb, the operator needs to hold the experimental ring to apply an axial force to the oxygen bomb so that the thread structure of the oxygen bomb becomes loose, and then the micrometer is used for measurement and reading. The whole process is not only cumbersome in operation, but also the amplitude of axial looseness is likely to deviate due to the operator manually moving the experimental ring, resulting in different values that may be measured by different operators. Summary of the Invention

[0004] Based on the above needs of the background art, this application provides a method for detecting the axial looseness of the threads of an oxygen bomb, which can improve the detection accuracy of the axial looseness of the threads of the oxygen bomb on the basis of the existing detection standards, and solve the problem that the risk of distortion of the measured axial looseness value of the threads is relatively high due to inconsistent operations in the prior art.

[0005] To achieve the above object, the technical solution of this application is as follows:

[0006] A method for detecting the axial looseness of the threads of an oxygen bomb includes the following steps:

[0007] S1. Set up at least one set of online projection image measuring instruments in the horizontal plane, and obtain the calibration interface for testing the axial looseness of the threads of the oxygen bomb based on the online projection image measuring instruments; fix the bomb body of the oxygen bomb between the online projection image measuring instruments so that the orthographic projection of the outer contour of the oxygen bomb is located within the calibration interface for testing the axial looseness of the threads of the oxygen bomb;

[0008] S2. Drive the oxygen bomb to rotate around its axis at a rotation angle of w, with m intermittent periods during the rotation process. Obtain n points on the orthographic projection of the connecting ring profile of the oxygen bomb as the first measurement points during each intermittent period. Apply a thrust of F along the axial direction of the oxygen bomb to the connecting ring of the oxygen bomb during the intermittent period, and respectively obtain the displacement amounts D1 to D of the first measurement points within the axial loosening test calibration interface of the oxygen bomb thread n , where both n and m are ≥ 1;

[0009] S3. Based on the formula Calculate the axial loosening degree d of the oxygen bomb thread, where m represents the number of intermittent periods during the rotation process, n represents the number of the first test points, and i = 1, 2,... n.

[0010] Preferably, in step S2, obtaining the displacement amounts D1 to D of the first measurement points within the axial loosening test calibration interface of the oxygen bomb thread n Specifically includes: During each intermittent period, use at least one point on the orthographic projection of the bomb body profile of the oxygen bomb as the second measurement point. When the thrust is equal to 0, measure the axial distance L between any one of the first measurement points and any one of the second measurement points based on the online projection image measuring instrument. When the thrust is equal to F, measure the axial distance H between the first measurement point and the second measurement point based on the online projection image measuring instrument. Calculate the displacement amount of the first measurement point along the axial direction within the loosening test calibration interface based on the formula D = |L - H|.

[0011] Preferably, the rotation angle w of the oxygen bomb satisfies 180° ≤ w ≤ 360°.

[0012] Preferably, ensure that when the thrust is equal to F, the axial deformation amount of the connecting ring of the oxygen bomb is 0.

[0013] Preferably, step S2 further includes, during the same intermittent period, using the point symmetric to any one of the first measurement points with respect to the axis of rotation of the oxygen bomb as the third measurement point. When the thrust is equal to 0, measure the axial distance L' between the third measurement point and any one of the second measurement points based on the online projection image measuring instrument. When the thrust is equal to F, measure the axial distance H' between the third measurement point and any one of the second measurement points based on the online projection image measuring instrument. Calculate the displacement amount of the third measurement point along the axial direction within the loosening test calibration interface based on the formula D' = |L' - H'|. Recheck D based on D'. If D' is equal to D, then perform step 3; if D' is not equal to D, then adjust the critical value F of the thrust.

[0014] The present application provides an oxygen bomb thread axial looseness detection device, including: a measurement platform; a driving component arranged on the top of the measurement platform, and the output end of the driving component is used to drive the oxygen bomb to rotate; a fixing component arranged on the top of the measurement platform for fixing the bomb body of the oxygen bomb; an axial pushing component arranged on the top of the measurement platform and on one side of the driving component for axially pushing the connection ring of the oxygen bomb; and at least one set of on-line projection image measuring instruments arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component for forming a projection plane of the oxygen bomb.

[0015] Preferably, the driving component includes a stepping motor, the stepping motor is arranged on the top of the measurement platform, and the driving shaft of the stepping motor is used to drive the oxygen bomb to rotate.

[0016] Preferably, the fixing component includes at least a pair of brackets, any pair of the brackets is arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component; a first push rod is arranged at the top end of the bracket, and a bomb body fixing piece is arranged at the output end of the first push rod, and the first push rod is used to synchronously drive the bomb body fixing piece to move axially.

[0017] Preferably, the axial pushing component includes at least a pair of lifting frames, any pair of the lifting frames is arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component, a second push rod is arranged at the output end of the lifting frame, and a connection ring pushing piece is arranged at the output end of the second push rod, the lifting frame is used to drive the second push rod to move axially, and the second push rod is used to drive the connection ring pushing piece to move radially.

[0018] Preferably, the connection ring pushing piece includes a third push rod with adjustable thrust and a dial rod, the fixed end of the third push rod is arranged at the output end of the second push rod, the dial rod is arranged at the output end of the third push rod, and the third push rod is used to drive the dial rod to move axially.

[0019] By adopting the above technical solutions, compared with the prior art, the present application has at least the following beneficial effects:

[0020] By applying the on-line projection image measuring instrument to measure the axial looseness value of the oxygen bomb thread, using the characteristics that the on-line projection image measuring instrument can accurately and directly measure the tolerances and clearances of precise structures, and combining with the existing methods for measuring oxygen bombs, the accurate and efficient detection of the axial looseness of the oxygen bomb thread is realized; during the whole detection process, there is no need to use low-efficiency and operation technique-dependent equipment such as external micrometers and dial indicators in the prior art for measurement and reading, which simplifies the detection process. Description of the Drawings

[0021] Figure 1Schematic diagram A of the orthographic projection contour of the oxygen bomb in the embodiment.

[0022] Figure 2 Schematic diagram B of the orthographic projection contour of the oxygen bomb in the embodiment.

[0023] Figure 3 Assembly schematic diagram of the device for detecting the axial looseness of the thread of the oxygen bomb in the embodiment.

[0024] Figure 4 Cross-sectional view A-A of the device for detecting the axial looseness of the thread of the oxygen bomb in the embodiment.

[0025] Figure 5 Partial enlarged cross-sectional view C of the device for detecting the axial looseness of the thread of the oxygen bomb in the embodiment (taken from Figure 4 ).

[0026] Figure 6 Axonometric structure schematic diagram of the device for detecting the axial looseness of the thread of the oxygen bomb in the embodiment.

[0027] Figure 7 Partial enlarged view D of the device for detecting the axial looseness of the thread of the oxygen bomb in the embodiment (taken from Figure 6 ).

[0028] In the figure: measuring platform 10, driving assembly 20, stepping motor 21, oxygen bomb support seat 22, anti-slip part 221, lifting table 222, driving motor 223, connecting base 224, fixing assembly 30, bracket 31, first push rod 32, bomb body fixing part 33, first pressure sensor 331, axial pushing assembly 40, lifting frame 41, second push rod 42, connecting ring pushing part 43, third push rod 431, lever 432, second pressure sensor 433, on-line projection image measuring instrument 50, oxygen bomb 60, bomb body 61, connecting ring 62. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will further describe the technical solutions of the present application with reference to the drawings of the embodiments of the present application. The present application is not limited to the following specific implementation manners.

[0030] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "inner", "outer", "left", "right", "front", "rear", "top", "bottom", etc., indicating the direction or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structure or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The following will further describe the present application in detail in conjunction with the attached Figure 1 to the attached Figure 7 drawings and specific embodiments.

[0032] The present application discloses a method for detecting the axial looseness of an oxygen bomb thread. The method includes the following steps:

[0033] Step 1:

[0034] Set up at least one set of on-line projection image measuring instruments 50 in a horizontal plane, and obtain an axial looseness test calibration interface for the oxygen bomb thread based on the on-line projection image measuring instruments 50; fix the bomb body 61 of the oxygen bomb 60 between the on-line projection image measuring instruments 50, so that the orthographic projection of the outer contour of the oxygen bomb 60 is located within the axial looseness test calibration interface of the oxygen bomb thread;

[0035] The specific process of implementing this step is as follows: Place the oxygen bomb 60 to be detected in a horizontal plane, and set up at least one set of on-line projection image measuring instruments 50 in this horizontal plane. Based on the telecentric optical projection system of the on-line projection image measuring instruments 50, an axial looseness test calibration interface for the oxygen bomb thread (hereinafter referred to as the "calibration interface") is formed between the lenses of any pair of on-line projection image measuring instruments 50 through the principle of parallel light projection. This calibration interface is a plane perpendicular to the horizontal plane where the viewing angle range that can be irradiated by the parallel light emitted from the lenses of the on-line projection image measuring instruments 50 is located, and is used to compare and measure the moving distance of the projection of the object appearing in this calibration interface or the distance between points; based on the relative positions of the on-line projection image measuring instruments 50 and the oxygen bomb 60, make the parallel light emitted from the on-line projection image measuring instruments 50 hit the surface of the oxygen bomb 60 perpendicular to the axis of the oxygen bomb 60, and project the orthographic projection of part or all of the outer contour of the oxygen bomb 60 into the above calibration interface, forming a scene as shown in the attached Figure 1 and the attached Figure 2 so as to obtain the axial looseness of the thread of the oxygen bomb 60 in this calibration interface through the following operations;

[0036] Step 2: On the premise that the oxygen bomb 60 is controlled to remain in its original position (i.e., the positional relationship between the oxygen bomb 60 and at least one set of online projection image measuring instruments 50 does not change in the horizontal plane), the equipment is used to drive the oxygen bomb 60 to rotate around its axis from 0° to w°. During the process of the oxygen bomb 60 rotating to w°, it is intermittently stopped m times (i.e., the oxygen bomb 60 stops rotating). During the intermittent time, n points are selected as the first measurement points on the orthographic projection of the contour of the connecting ring 62 of the oxygen bomb 60; during the intermittent time, a thrust of F is applied to the connecting ring 62 of the oxygen bomb 60 along the axial direction of the oxygen bomb 60. This thrust may cause the connecting ring 62 part of the oxygen bomb 60 to undergo a parallel displacement relative to the bomb body 61 part. After the thrust reaches F, based on the online projection image measuring instrument 50, the displacement amounts D1 to D of the above-mentioned first measurement points in the calibration interface are respectively obtained n (D1 represents the displacement amount of the first first measurement point, and so on, D n represents the displacement amount of the nth first measurement point);

[0037] Specifically, at least one first measurement point is selected on the projection contour of the connecting ring 62 of the oxygen bomb 60 during each intermittent time when the oxygen bomb 60 rotates to w° (see Appendix Figure 1 and Appendix Figure 2 . In the figures, two upper and lower points are selected as the first measurement points on the left side of the projection contour of the connecting ring 62). Generally speaking, that is, the number of first measurement points selected during the entire rotation process: n ≥ m ≥ 1; based on the measurement function of the online projection image measuring instrument 50 for the point pitch on the projection, the displacement distance of each first measurement point from the position in the state where the thrust is 0 to the position in the state where the thrust reaches F is measured, that is, the displacement amounts of all first measurement points in the calibration interface for the axial looseness test of the oxygen bomb thread can be obtained; in the above process, w represents the angle value at which the oxygen bomb 60 finally stops rotating in a complete process of measuring the axial looseness of the thread; m represents the number of intermittent times during the process of the oxygen bomb 60 rotating to w°. Specifically, m can be set based on w°. If the total rotation angle value of the oxygen bomb 60 is 180°, in order to ensure that the selected first measurement points are relatively evenly distributed, the oxygen bomb 60 can be controlled to intermittently stop once every 45° of rotation, that is, intermittently stop 3 to 4 times during the entire process;

[0038] Step 3: Calculate the axial looseness d of the oxygen bomb thread based on the formula , where m represents the number of intermittent times during the rotation process, n represents the number of first test points, and i = 1, 2,... n;

[0039] Specifically, use the above formula to find the average value of the displacement amounts of the m*n first measurement points selected during the rotation process of the oxygen bomb 60 to obtain the value of the axial looseness of the oxygen bomb thread.

[0040] Using the above method for detecting the axial looseness of the oxygen bomb thread has at least the following beneficial effects:

[0041] The axial looseness value of the oxygen bomb thread is measured by applying the online projection image measuring instrument 50. By utilizing the characteristics of the online projection image measuring instrument 50 that can accurately and directly measure the tolerances and clearances of precision structures, combined with the existing methods for measuring the oxygen bomb 60, the accurate and efficient detection of the axial looseness of the oxygen bomb thread is realized; during the whole detection process, there is no need to measure and read through inefficient and operation technique-dependent devices such as outside micrometers and dial indicators in the prior art, which simplifies the detection process.

[0042] In addition, the present application also provides some more specific implementation manners to improve the above-mentioned method for detecting the axial looseness of the oxygen bomb thread.

[0043] To simplify the calculation process of the detection and give full play to the efficiency and accuracy of the online projection image measuring instrument 50 in detecting the axial looseness of the oxygen bomb thread, the displacement of the first measurement point in the above step two is specifically measured by the following method: during each intermittent time when the oxygen bomb 60 rotates to the angle of w°, at least one point on the positive projection of the contour of the bomb body 61 of the oxygen bomb 60 is used as the second measurement point (see Appendix Figure 1 and Appendix Figure 2 In the figure, two upper and lower points are selected on the left side of the projection contour of the bomb body 61 as the second measurement points). First, when the thrust applied to the connecting ring 62 is 0 (i.e., before the thrust is applied), based on the online projection image measuring instrument 50, the axial distance L between any one of the above first measurement points and any one of the second measurement points is output; when the thrust applied to the connecting ring 62 reaches the limit value F, based on the online projection image measuring instrument 50, the stable state distance H along the axis between the same first measurement point and the same second measurement point is output. That is, L represents the horizontal distance between a certain point on the contour of the connecting ring 62 and a certain point on the contour of the bomb body 61 before the force is applied. The displacement of the first measurement point along the axis within the calibration interface is calculated by the formula D = |L - H|.

[0044] Specifically, since the existing online projection image measuring instrument 50 is more efficient and accurate in detecting static objects, such as the online projection image measuring instrument 50 of the Keyence - TM - X5000 series, without changing its basic measurement algorithm, by measuring the axial distance between the same pair of measurement points on the oxygen bomb 60 in two states before applying the force and when the force reaches F by this online projection image measuring instrument 50, the due measurement level of the online projection image measuring instrument 50 can be exerted; and since the bomb body 61 of the oxygen bomb 60 remains stationary before and during the application of the force, by selecting the second measurement point on the bomb body 61 as the reference point, the position change of the first measurement point can be more significantly reflected.

[0045] Further, to ensure that the displacement of the first measurement point obtained can fully represent the numerical level of axial loosening of the connecting ring 62, the rotation angle of the oxygen bomb 60 during a single measurement of the axial loosening degree of the thread is 180° ≤ w ≤ 360°.

[0046] Specifically, in one embodiment, the measurement range of the online projection image measuring instrument 50 set up ≤ 120 mm (it is known that the maximum measurement range of the Keyence - TM - X5000 series online projection image measuring instrument 50 preferably used in this application does not exceed 120 mm). To ensure that a group of online projection image measuring instruments 50 within this measurement range can implement the above step two, the maximum outer diameter of the oxygen bomb 60 to be measured should not exceed 120 mm, so as to ensure that the projection range of the online projection image measuring instrument 50 can cover the maximum width of the orthographic projection contour of the oxygen bomb 60. Within this measurement range, as long as the in - situ rotation angle of the oxygen bomb 60 is controlled to be not less than 180°, the front view and the rear view of the oxygen bomb 60 can be projected onto the calibration interface, so as to ensure that the first measurement point selected is any point within the circumferential range of the connecting ring 62;

[0047] In another embodiment, to ensure that the online projection image measuring instrument 50 carried can detect the axial loosening degree of the thread of the oxygen bomb 60 with a maximum outer diameter exceeding 120 mm (for example, the outer diameter of the oxygen bomb 60 in GB9706.1 - 2020 is 123 mm), a scheme of parallelly setting up two groups of online image projection measuring instruments in the horizontal plane is adopted, so that the sum of the projection ranges of the two groups of online image projection measuring instruments can cover the maximum width of the orthographic projection contour of the oxygen bomb 60. In this embodiment, by controlling the in - situ rotation angle of the oxygen bomb 60 to reach 180°, the front view and the rear view of the oxygen bomb 60 can also be projected onto the calibration interface, so as to ensure that the first measurement point selected is any point within the circumferential range of the connecting ring 62;

[0048] In another solution different from the above two embodiments, if only one group of online projection image measuring instruments 50 can be set up due to cost or other conditions, and the measurement range of this online projection image measuring instrument 50 is not sufficient to cover the maximum width of the orthographic projection contour of the oxygen bomb 60, the oxygen bomb 60 can be offset - that is, only one side of the orthographic projection contour of the oxygen bomb 60 (this "one side" refers to the side including the connecting ring 62 and the bomb body 61) is placed within the calibration range of the online projection image measuring instrument 50, and the in - situ rotation angle of the oxygen bomb 60 is controlled to reach 360°, so as to ensure that the first measurement point selected is any point within the circumferential range of the connecting ring 62.

[0049] Further, to ensure that the displacement of the first measurement point obtained in the above embodiments is solely due to the axial loosening of the connecting ring 62 relative to the elastic body 61, the maximum limit value of the thrust force F applied to the connecting ring 62 during the measurement process should not be sufficient to cause axial deformation of the connecting ring 62 itself, so as to prevent the axial deformation of the connecting ring 62 caused by excessive thrust from affecting the displacement of the connecting ring 62 due to screw axial loosening.

[0050] Specifically, since the standard for measuring the screw axial looseness of the oxygen bomb 60 requires the experimenter to manually pull up the test ring to push the connecting ring of the oxygen bomb 60 (the component that fixes the connecting ring 62 and the elastic body 61 with a screw structure), and the relevant standard does not specify how much the thrust force for manually pushing the connecting ring is, it only states that the manually applied thrust force should be such that it can prompt the screw to reflect the true axial looseness. The purpose of applying this thrust force is not to cause forced displacement of the connecting ring, and the magnitude of the thrust force should be such that it does not damage the screw integrity and can complete the axial loosening. Given the relatively vague definition of this standard, during the implementation of the above steps, the thrust force applied to the connecting ring 62 should be at least controlled within the range that does not damage the screw integrity of the oxygen bomb 60, ensuring that the connecting ring 62 participates in the entire test process in its natural state before the test, and the oxygen bomb 60 still remains in the state before the test after the test, that is, the thrust force applied to the oxygen bomb 60 in this application should be ensured not to cause axial deformation of the connecting ring 62 or the connecting ring. The numerical limit value of this thrust force can be obtained specifically through the following method: The operator performs the screw axial looseness test on oxygen bombs 60 of various models in accordance with the regulations of MT / T 737 - 2007 "Calorimeter Oxygen Bomb Safety Performance Inspection Specification". During the test process, the operator manually pulls up the test ring and selects multiple test points to measure the screw axial looseness. On the premise of ensuring that the test results are consistent with the actual situation, a thrust sensor or a pressure sensor (such as a thin-film pressure sensor - a sensor in which when an external force acts on the sensor, the elastic film (such as a silicon diaphragm, a metal or polymer film) deforms, causing a change in the resistance value of the strain resistor (such as a diffused silicon resistor or carbon paste) attached to the film. This change is converted into a voltage signal output through a Wheatstone bridge circuit to reflect the magnitude of the pressure) is set on the test ring and a control test is carried out. Based on the thrust sensor, multiple groups of thrust force values are recorded, and through data statistics, the limit value of the thrust force applied to the oxygen bomb 60 during the test process is obtained, and this limit value can be applied to this application as a reference.

[0051] Further, the above step two also includes a process of rechecking the displacement D of the above first measurement point along the axial direction within the loosening test calibration interface. The specific steps are as follows:

[0052] During the implementation of the above step 2, within the same intermittent time of selecting the first measurement point or the second measurement point, with the rotation axis of the oxygen bomb 60 as the symmetry axis, the point symmetrical to any first measurement point is used as the third measurement point. When the above thrust is equal to 0, based on the same principle as in the above step 2, the distance L' along the axial direction between the third measurement point and any second measurement point (see Appendix Figure 1 and Appendix Figure 2 In, a point symmetrical to one of the above first measurement points is selected on the right side of the projected contour of the connecting ring 62 as the third measurement point, and a point symmetrical to one of the above second measurement points on the same side is selected as the second measurement point for review) is measured; when the thrust is equal to F, based on the output of the online projection image measuring instrument 50, the distance H' along the axial direction between the third measurement point and the same second measurement point is measured. Based on the formula D' = |L' - H'|, the displacement of the third measurement point along the axial direction within the loosening test calibration interface is calculated. Based on D', D is reviewed. If D' is equal to D, then the above step 3 is performed to obtain the axial loosening value of the thread; if D' is not equal to D, it proves that the connecting ring 62 may have deformed under the action of the thrust or the critical value of the thrust is too large, resulting in forced displacement of the connecting ring or the connecting ring 62, causing different displacement amounts of the points on both sides of the positive projection contour of the connecting ring 62. In this case, the critical value F of the thrust is adjusted until D' is equal to D, and then the measurement is performed again. Specifically, when implementing this review step, it can be implemented together with the above step 2, so that each D value obtained during each intermittent process can have a corresponding D' review to ensure that the applied thrust meets the requirements.

[0053] In addition to the above oxygen bomb thread axial loosening degree detection method, the present application also discloses an oxygen bomb thread axial loosening degree detection device, which can be used to detect the oxygen bomb thread axial loosening degree by applying the above method.

[0054] The device includes a measurement platform 10 for providing a horizontal plane for setting up the online projection image measuring instrument 50;

[0055] It further includes a driving component 20 arranged on the top of the measurement platform 10, and the output end of the driving component 20 is used to drive the oxygen bomb 60 to rotate;

[0056] It further includes a fixing component 30 arranged on the top of the measurement platform 10 for fixing the bomb body 61 of the oxygen bomb 60;

[0057] It further includes an axial pushing component 40 arranged on the top of the measurement platform 10 and on one side of the driving component 20 for axially pushing the connecting ring 62 of the oxygen bomb 60;

[0058] And at least one group of online projection image measuring instruments 50 arranged on the top of the measurement platform 10 and symmetrically distributed on both sides of the driving component 20 for forming the projection surface of the oxygen bomb 60.

[0059] In a specific embodiment, the above-mentioned measurement platform 10 is a box body with a hollow bottom. The driving assembly 20 includes a stepping motor 21, which is arranged on the top surface inside the measurement platform 10, and the driving shaft can drive the oxygen bomb 60 to rotate.

[0060] In order to enable the oxygen bomb 60 to rotate smoothly and in place, an oxygen bomb support seat 22 is coaxially arranged on the driving shaft of the above-mentioned stepping motor 21, which can carry the oxygen bomb 60 to rotate. Specifically, the oxygen bomb support seat 22 can increase the friction between its top surface and the oxygen bomb 60 by setting an anti-slip portion 221 on its top, ensuring that the oxygen bomb 60 can rotate with the driving shaft of the stepping motor 21 and preventing the oxygen bomb 60 from slipping and shifting. The anti-slip portion 221 can be a rubber pad attached to the top surface of the oxygen bomb support seat 22, or structures such as grooves and flanges that fit the bottom surface of the oxygen bomb 60 can be set on the top surface of the oxygen bomb support seat 22 to fix the oxygen bomb 60.

[0061] Furthermore, in order to drive the oxygen bomb 60 to move up and down in a lifting manner to achieve the purpose of finely adjusting the position of the projection of the oxygen bomb 60 in the height direction, the above-mentioned oxygen bomb support seat 22 includes a connecting base 224 arranged on the driving shaft of the stepping motor 21, a driving motor 223 arranged on the top of the connecting base 224, and a lifting platform 222 arranged on the driving shaft of the driving motor 223. Among them, the connecting base 224 is in a cylindrical shape, its bottom surface is fixedly coaxially connected with the driving shaft of the stepping motor 21, its side surface is rotatably connected with the top surface of the measurement platform 10 through a bearing, and its inner surface is slidably matched with the cylindrical lifting platform 222. The driving motor 223 is a servo motor, and a threaded structure or a connecting lead screw is processed at one end of its driving shaft. A threaded hole is arranged at the center of the bottom of the lifting platform 222 and is in threaded transmission cooperation with the driving shaft of the driving motor 223. The servo motor can drive the lifting platform 222 to rotate forward or backward, so that the lifting platform 222 rotates up or down under the action of the threaded structure. When the servo motor does not output power, the friction between the lifting platform 222 and the connecting base 224 causes the lifting platform 222 to be locked in the vertical direction, so that during the process of the stepping motor 21 driving the connecting base 224 to rotate relative to the measurement platform 10, the lifting platform 222 only rotates synchronously with the connecting base 224 and does not perform a lifting movement.

[0062] Further, the above-mentioned fixing component 30 includes at least a pair of brackets 31. Any pair of brackets 31 is arranged on the upper part of the top surface of the measurement platform 10 and symmetrically distributed on both sides of the above-mentioned driving component 20. In a preferred embodiment, the axis of symmetry is the extension line of the driving shaft of the above-mentioned stepping motor 21. The top ends of the brackets 31 are respectively provided with first push rods 32, and the output ends of the first push rods 32 are provided with bullet fixing members 33. Specifically, the first push rod 32 is a servo electric push rod, and the bullet fixing member 33 is a push plate or a claw with an arc-shaped surface. The arc-shaped side thereof is used to fit and hold the bullet 61 of the oxygen bomb 60 tightly. The other side of the bullet fixing member 33 is connected to the output shaft of the servo electric push rod, and the first push rod 32 can push the bullet fixing member 33 to move synchronously along the axis.

[0063] Further, to ensure that the fixing component 30 can adjust the corresponding thrust according to the specifications of the oxygen bomb 60 to be measured to meet the fixation of oxygen bombs 60 with different diameters, a first pressure sensor 331 is embedded on the surface of the bullet fixing member 33 that can contact the bullet 61. On the premise that the thrust value of the first push rod 32 is set, the first push rod 32 can push or stop pushing based on the pressure signal fed back by the first pressure sensor 331, so that a pair of bullet fixing members 33 can hold the bullet 61 with a set thrust, thereby avoiding loosening of the bullet 61 caused by insufficient thrust or damage to the first push rod 32 or the oxygen bomb 60 due to excessive thrust.

[0064] In another embodiment, there are the following differences from the above-mentioned embodiment:

[0065] In the case where other structures are the same, the fixing component 30 is different. In this embodiment, the fixing component includes an industrial suction cup with adjustable adsorption force. The industrial suction cup is coaxially fixed to the upper end of the driving shaft of the stepping motor 21 and the adsorption surface faces upward. The stepping motor 21 can drive the industrial suction cup to rotate around the axis, and can drive the oxygen bomb adsorbed on the top of the industrial suction cup to rotate. When it is necessary to take or replace the oxygen bomb, adjust the adsorption force of the industrial suction cup to make it reach the level of firmly adsorbing the bottom of the oxygen bomb bullet or loosening the oxygen bomb.

[0066] In a preferred embodiment, the above-mentioned axial pushing assembly 40 includes at least a pair of lifting frames 41 arranged on the top of the measuring platform 10. Any pair of lifting frames 41 are symmetrically distributed on both sides of the driving assembly 20. The output end of the lifting frame 41 is provided with a second push rod 42, and the output end of the second push rod 42 is provided with a connecting ring pushing member 43. Specifically, in a preferred embodiment, the above-mentioned connecting ring pushing member 43 is a member whose one side surface can horizontally fit the bottom surface of the connecting ring 62. The lifting frame 41 includes a servo electric push rod that can output in the vertical direction, and its output end is provided with another servo electric push rod that can output in the axial direction (i.e., the second push rod 42). The output end of the latter is connected to the above-mentioned connecting ring pushing member 43. A pair of lifting frames 41 can synchronously push the connecting ring pushing member 43 upward in the vertical direction with the same thrust, so that it can be within the height range where the connecting ring 62 is located (to make the thrust applied to the connecting ring 62 relatively uniform, it is best that a pair of connecting ring pushing members 43 synchronously contact the bottom surface of the connecting ring and synchronously apply the same upward thrust). The second push rod 42 on the lifting frame 41 can axially drive the connecting ring pushing member 43 to approach the bottom of the connecting ring 62, so as to achieve the purpose of adjusting the position of the connecting ring pushing member 43 and the contact area between the connecting ring pushing member 43 and the bottom of the connecting ring 62.

[0067] Furthermore, to ensure that the axial pushing assembly 40 can accurately apply a set axial thrust to the connecting ring 62, the above-mentioned connecting ring pushing member 43 includes a third push rod 431 and a dial rod 432. The third push rod 431 is a micro servo electric push rod with adjustable thrust (having a smaller pushing stroke and adjustable thrust function compared to the lifting frame 41 and the second push rod 42). The fixed end of the third push rod 431 is arranged at the output end of the second push rod 42, and the dial rod 432 is arranged at the output end of the third push rod 431. The third push rod 431 can axially drive the dial rod 432 to move with a small stroke upward. The top surface of the dial rod 432 is a plane parallel to the bottom surface of the connecting ring, and a second pressure sensor 433 is arranged on the part of the top surface of the dial rod 432 that can fully contact the bottom surface of the connecting ring. On the premise that the thrust value of the third push rod 431 is set, the third push rod 431 can execute pushing or stop pushing based on the pressure signal fed back by the second pressure sensor 433, so that the dial rod 432 can apply the set thrust to the connecting ring 62, thereby avoiding inaccurate measurement of the axial looseness of the thread due to insufficient thrust resulting in no thread loosening between the connecting ring 62 and the projectile 61, or excessive thrust damaging the thread structure or causing deformation of the connecting ring 62.

[0068] In order to enable the above-mentioned projectile fixing member 33 and the connecting ring pushing member 43 to apply the thrust evenly to the oxygen bomb 60 and avoid stress concentration, the above-mentioned first pressure sensor 331 and second pressure sensor 433 are both preferably a thin-film pressure sensor. The pressure detection ends in the form of thin films are respectively embedded or attached to the side surfaces of the projectile fixing member 33 and the lever 432 that are in contact with the oxygen bomb 60. The pressure detection ends in the form of thin films can not only avoid the problem of thrust concentration, but also help to improve the pressure feedback accuracy.

[0069] When using the above-mentioned oxygen bomb thread axial looseness detection device:

[0070] Ensure that the drive assembly 20, the fixing assembly 30, and the axial pushing assembly 40 are in the initial position or state;

[0071] The online projection image measuring instrument 50 is in the detection standby state, and the oxygen bomb 60 to be detected is placed at the axis center of the anti-slip portion 221;

[0072] After driving the projectile fixing member 33 by the first push rod 32 to fix the projectile 61 part of the oxygen bomb 60 with a set thrust, start the lifting frame 41 and the second push rod 42 to move the lever 432 to a position close to the bottom of the connecting ring 62, and then start the third push rod 431 to apply a set thrust to the axis of the connecting ring 62 of the oxygen bomb 60;

[0073] Output a set of oxygen bomb thread axial looseness values through the online projection image measuring instrument 50;

[0074] Reverse the operation of the third push rod 431 to cancel the thrust, reverse the operation of the first push rod 32 to loosen the projectile 61, start the stepping motor 21 to drive the oxygen bomb 60 to rotate in place by a set rotation angle, and the set angle is preferably 45°. After reaching the set rotation angle, repeat the above steps until the rotation angle of the oxygen bomb 60 relative to the initial position of rotation is not less than 180°, output multiple sets of oxygen bomb thread axial looseness values, and obtain the measured value of the thread axial looseness of the oxygen bomb 60 by averaging the multiple sets of oxygen bomb thread axial looseness values.

[0075] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation manners of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for detecting the axial looseness of the oxygen bomb thread, characterized in that, The method includes the following steps: S1. Set up at least one set of on-line projection image measuring instruments in a horizontal plane, and obtain an oxygen bomb thread axial loosening test calibration interface based on the on-line projection image measuring instruments; fix the bomb body of the oxygen bomb between the on-line projection image measuring instruments, so that the orthographic projection of the outer contour of the oxygen bomb is located within the oxygen bomb thread axial loosening test calibration interface; S2. Drive the oxygen bomb to rotate around its axis by an angle w, with m intermittent rotations during the rotation process. Obtain n points on the orthographic projection of the connecting ring contour of the oxygen bomb as the first measurement points during each intermittent time; apply a thrust of F along the axial direction of the oxygen bomb to the connecting ring of the oxygen bomb during the intermittent time, and respectively obtain the displacement amounts D1 to Dn of the first measurement points within the oxygen bomb thread axial loosening test calibration interface, where n and m are both ≥ 1; S3. Based on the formula Calculate the axial looseness d of the oxygen bomb thread, where m represents the number of intermittent times during the rotation process, n represents the number of the first test points, and i = 1, 2,... n.

2. The method for detecting the axial looseness of the oxygen bomb thread according to claim 1, characterized in that In step S2, obtaining the displacement amounts D1 to Dn of the first measurement points within the oxygen bomb thread axial loosening test calibration interface specifically includes: during each intermittent time, use at least one point on the orthographic projection of the bomb body contour of the oxygen bomb as the second measurement point. When the thrust is equal to 0, based on the on-line projection image measuring instrument, output the axial distance L between any one of the first measurement points and any one of the second measurement points; when the thrust is equal to F, based on the on-line projection image measuring instrument, output the axial distance H between the first measurement point and the second measurement point, and calculate the displacement amount of the first measurement point along the axial direction within the loosening test calibration interface based on the formula D = ||L - H||.

3. The method for detecting the axial looseness of the oxygen bomb thread according to claim 2, wherein, The rotation angle w of the oxygen bomb satisfies 180° ≤ w ≤ 360°.

4. The method for detecting the axial looseness of the oxygen bomb thread according to claim 2, characterized in that, Ensure that when the thrust is equal to F, the axial deformation amount of the connecting ring of the oxygen bomb is 0.

5. The oxygen bomb thread axial looseness detection method according to claim 2, characterized in that Step S2 further includes, during the same intermittent time, using the point symmetrical to any one of the first measurement points with respect to the axis of rotation of the oxygen bomb as the third measurement point. When the thrust is equal to 0, based on the on-line projection image measuring instrument, output the axial distance L' between the third measurement point and any one of the second measurement points; when the thrust is equal to F, based on the on-line projection image measuring instrument, output the axial distance H' between the third measurement point and any one of the second measurement points, and calculate the displacement amount of the third measurement point along the axial direction within the loosening test calibration interface based on the formula D' = ||L' - H'||, and check D based on D'. If D' is equal to D, then perform step 3; if D' is not equal to D, then adjust the critical value F of the thrust.

6. An oxygen bomb thread axial looseness detection device, which is applied to the oxygen bomb thread axial looseness detection method described in any one of claims 1 to 5, and is characterized in that, It includes a measurement platform; a driving component, arranged on the top of the measurement platform, and the output end of the driving component is used to drive the oxygen bomb to rotate; a fixing component, arranged on the top of the measurement platform, used to fix the bomb body of the oxygen bomb; an axial pushing component, arranged on the top of the measurement platform and on one side of the driving component, used to axially push the connecting ring of the oxygen bomb; and at least one set of on-line projection image measuring instruments, arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component, used to form a projection plane of the oxygen bomb.

7. The oxygen bomb thread axial looseness detection device according to claim 6, characterized in that, The driving component includes a stepping motor, the stepping motor is arranged on the top of the measurement platform, and the driving shaft of the stepping motor is used to drive the oxygen bomb to rotate.

8. The oxygen bomb thread axial looseness detection device according to claim 6, characterized in that The fixed component includes at least a pair of brackets. Any pair of the brackets is arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component; a first push rod is arranged at the top end of the bracket, and a projectile fixing member is arranged at the output end of the first push rod. The first push rod is used to synchronously drive the projectile fixing member to move axially.

9. The oxygen bomb thread axial looseness detection device according to claim 6, wherein, The axial pushing component includes at least a pair of lifting frames. Any pair of the lifting frames is arranged on the top of the measurement platform and symmetrically distributed on both sides of the driving component. A second push rod is arranged at the output end of the lifting frame, and a connecting ring pushing member is arranged at the output end of the second push rod. The lifting frame is used to drive the second push rod to move axially, and the second push rod is used to drive the connecting ring pushing member to move radially.

10. The oxygen bomb thread axial looseness detection device according to claim 9, characterized in that, The connecting ring pushing member includes a third push rod with adjustable thrust and a lever. The fixed end of the third push rod is arranged at the output end of the second push rod, and the lever is arranged at the output end of the third push rod. The third push rod is used to drive the lever to move axially.

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