A wall thickness detection tool and detection method for a small pressure tank

Abstract

The application discloses a wall thickness detection tool and detection method of a small pressure tank, and relates to the field of pressure tank wall thickness detection.The tool comprises a center rod and a plurality of measuring blocks, the plurality of measuring blocks are arranged in a circle around the axis of the center rod, each measuring block is hinged with a first linkage rod and a second linkage rod, and the first linkage rod is hinged with the center rod; a translation assembly capable of translating along the axis of the center rod is arranged on the center rod, the second linkage rod is hinged with the translation assembly; a zero point positioning block is arranged at the rear end of the center rod, the translation assembly can abut against the zero point positioning block, and the axis of the first linkage rod and the second linkage rod forms a non-zero angle with the axis of the center rod when the translation assembly abuts against the zero point positioning block; and a scale is marked on the center rod from the position of the zero point positioning block.The application is suitable for small pressure tanks with small caliber, and is a pure mechanical structure, which effectively improves the adaptability of the use scene.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pressure vessel wall thickness detection, in particular to a small pressure tank wall thickness detection tool and detection method. BACKGROUND

[0002] Small pressure tanks such as micro-reactors (such as Hastelloy micro-reactors), chemical dosing tanks, and medical sterilization tanks for storing disinfectants (such as ethylene oxide, peracetic acid, and other corrosive sterilizing agents) usually have the following characteristics:

[0003] 1. The general structure is as shown in Figure 1 The caliber (inner diameter) is small, and the inner diameter of the tank belly is larger than the caliber. For example, the caliber of a micro-reactor is not more than 150 mm, and the inner diameter of the tank belly is about 200 mm. For example, the caliber of a chemical dosing tank is usually 15-50 mm, and the inner diameter of the tank belly is 200-600 mm.

[0004] 2. Corrosive media are stored in the tank, such as strong acid (H2SO4, HCl), strong base (NaOH), and organic solvent in the micro-reactor, and sodium hypochlorite (NaClO), hydrogen peroxide (H2O2), and pickling solution in the dosing tank.

[0005] 3. The internal environment is under pressure greater than normal pressure, such as a micro-reactor with a design pressure of 0.5-35 MPa, and a chemical dosing tank with a design pressure of 0.3-1.6 MPa.

[0006] Based on the above characteristics, the wall thickness of small pressure tanks needs to be strictly controlled to ensure that the wall thickness of small pressure tanks meets the requirements to prevent media leakage.

[0007] Currently, the detection device for detecting the wall thickness of the tank body and the pipe body is usually ultrasonic thickness measurement, which has high requirements for material quality, such as cast iron, austenitic stainless steel, or cast copper alloy. It is easy to cause sound wave scattering, resulting in reading fluctuation, high signal-to-noise ratio, etc. The ultrasonic thickness measurement also requires power supply, and the use environment is restricted, such as the need for a long enough cable to meet the power supply requirements for detection when detecting outside the factory area. Another detection device is a combination of electrical control and machinery, such as Chinese patents CN115824106A and CN117181625A. Due to the presence of an electrical control system, it also requires power supply, and the overall size is large, which is completely unsuitable for small pressure tanks, and it cannot be placed in the tank body.

[0008] These problems are solved to some extent in Chinese Patent No. CU211876930U, but the patent document clearly states that "the distance between the two measuring heads 33, i.e. the inner diameter of the high-pressure gas cylinder 11", based on the small size of the inner diameter of the small pressure tank, the small span also has a large change in the value of the arc, the width span of the measuring head 33 is easy to form a chord on the inner wall of the small pressure tank, thereby causing high error in the inner diameter measurement.

[0009] Therefore, it is necessary to study a wall thickness detection tool and method for small pressure tanks. SUMMARY

[0010] The purpose of the present application is to provide a wall thickness detection tool and method for small pressure tanks, which is suitable for small caliber small pressure tanks and has a pure mechanical structure, effectively improving the adaptability of the use scene.

[0011] The technical solution adopted by the present application is as follows: a wall thickness detection tool for small pressure tanks, comprising a center rod and a plurality of measuring blocks, the plurality of measuring blocks are arranged circumferentially around the center rod axis, and the front end of each measuring block is hinged to one end of a first linkage rod, the other end of the first linkage rod is hinged to the front end of the center rod; a translation assembly capable of translating along the center rod axis is provided on the center rod, the rear end of each measuring block is hinged to one end of a second linkage rod, the other end of the second linkage rod is hinged to the translation assembly; the distance between the two hinged positions on the first linkage rod is consistent with the distance between the two hinged positions on the second linkage rod; a zero point positioning block is provided at the rear end of the center rod, the translation assembly can abut against the zero point positioning block, and when the translation assembly abuts against the zero point positioning block, the axes of the first linkage rod and the second linkage rod form a non-zero angle with the axis of the center rod; a scale is marked on the center rod from the position of the zero point positioning block.

[0012] Further, the front end of the center rod is provided with a fixed plate, the other end of the first linkage rod is hinged to the fixed plate, and the vertical distance from the hinged position of the first linkage rod and the fixed plate to the center rod axis is consistent with the vertical distance from the hinged position of the second linkage rod and the translation assembly to the center rod axis.

[0013] Further, a rotating shaft is provided at the hinged position of the first linkage rod and the second linkage rod, respectively, and the rotating shaft is rotatably connected with the corresponding hinged component.

[0014] Further, the translation assembly is a sleeve.

[0015] Further, the translation assembly comprises a sliding plate and an internally threaded pipe, the internally threaded pipe is rotatably connected with the sliding plate; the center rod has an externally threaded section, and the internally threaded pipe is threadedly connected with the externally threaded section.

[0016] Further, a bearing is arranged between the sliding plate and the internally threaded pipe.

[0017] Further, the scale is marked according to the formula about d-x, wherein:

[0018]

[0019] d is the inner diameter of the small pressure tank;

[0020] f is the distance from the rotation axis of the first linkage rod and the center rod to the center rod axis; or / and the distance from the rotation axis of the second linkage rod and the translation assembly to the center rod axis;

[0021] c is the distance from the rotation axis of the first linkage rod or / and the second linkage rod to the upper surface of the measuring block;

[0022] l is the distance between the two articulated positions on the first linkage rod, or / and the distance between the two articulated positions on the second linkage rod;

[0023] e is the distance between the two articulated positions on the first linkage rod or / and the second linkage rod projected on the center rod when the translation assembly is against the zero positioning block;

[0024] x is the distance of the translation assembly movement;

[0025] w is the width of the measuring block.

[0026] Further, after obtaining the inner diameter d of the small pressure tank, the thickness y is obtained according to the formula about y-d, wherein:

[0027]

[0028] D is the outer diameter of the small pressure tank.

[0029] A wall thickness detection method of a small pressure tank, applying the wall thickness detection tool of the small pressure tank, comprising the following steps:

[0030] S1: move the translation assembly backward, so that the rear end of the translation assembly is against the zero positioning block, at this time, all the measuring blocks are at the limit position close to the center rod, and the radial size of the entire wall thickness detection tool is the smallest;

[0031] S2: insert the front end of the wall thickness detection tool into the small pressure tank from the tank opening of the small pressure tank, until the second linkage rod also enters the small pressure tank;

[0032] S3: move the translation assembly forward, under the cooperation of the first linkage rod and the second linkage rod, the measuring blocks move away from the center tube, until the translation assembly cannot move forward any more;

[0033] S4: reading the scale value of the scale coinciding with the rear end of the translation assembly, which is the inner diameter of the small pressure tank;

[0034] S5: moving the translation assembly backward, so that the rear end of the translation assembly abuts against the zero positioning block again, and the wall thickness detection tool is taken out from the tank opening of the small pressure tank;

[0035] S6: measuring the outer diameter of the small pressure tank, obtaining the wall thickness by subtracting the inner diameter from the outer diameter of the small pressure tank, and completing the wall thickness detection of the small pressure tank.

[0036] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0037] 1. The present application realizes the automatic coincidence of the axis of the center rod and the axis of the small pressure tank by measuring the circumferential array of the measuring block and synchronous movement, thereby providing a basis for accurate wall thickness detection data of the small pressure tank;

[0038] 2. The structure of the present application is simple, and the measuring block is moved by the translation assembly, so that the entire wall thickness detection tool has the minimum radial size, thereby enabling the tool to be inserted into the pipe from the tank opening of the small pressure tank, and effectively realizing the wall thickness detection of the small pressure tank;

[0039] 3. The wall thickness detection tool of the present application is a pure mechanical structure, does not need power supply, is not constrained by the detection site environment, and has higher adaptability;

[0040] 4. The present application considers the width size of the measuring block, solves the problem of measurement error caused by the width span forming a chord on the inner wall of the small pressure tank, and effectively improves the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0041] The present application will be described by examples and with reference to the accompanying drawings, in which:

[0042] Figure 1 is a structural schematic view of a small pressure tank;

[0043] Figure 2 is a structural schematic view of the present application;

[0044] Figure 3 is a structural schematic view of the translation assembly abutting against the zero positioning block in the present application;

[0045] Figure 4 is a state schematic view of the present application during measurement;

[0046] Figure 5 is Figure 4 is an enlarged schematic view of position A in the present application;

[0047] Marked in the figure: 1 - center rod; 2 - fixed plate; 3 - measuring block; 4 - first linkage rod; 5 - second linkage rod; 6 - sliding plate; 7 - inner threaded tube; 8 - zero positioning block; 9 - rotating shaft; 10 - small pressure tank. DETAILED DESCRIPTION

[0048] In the description of the present specification, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, only for the convenience of describing the present specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present specification.

[0049] In addition, in the description of the present specification, the terms "horizontal", "vertical" and the like do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0050] In the description of the present specification, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense. For example, the connection can be a fixed connection, or a detachable connection, or an integral connection; can be a mechanical connection, or an electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the connection between two elements inside.

[0051] The width direction is perpendicular to the axis direction of the small pressure tank, and the length direction is parallel to the axis direction of the small pressure tank.

[0052] Example 1

[0053] As Figures 2-5As shown, a wall thickness detection tool of a small pressure tank 10 comprises a center rod 1 and four measuring blocks 3, the four measuring blocks 3 are arranged in a circumferential array around the axis of the center rod 1, and the front end of each measuring block 3 is hinged to one end of a first linkage rod 4, the other end of the first linkage rod 4 is hinged to the front end of the center rod 1; a translation assembly capable of translating along the axis of the center rod is arranged on the center rod 1, the rear end of each measuring block 3 is hinged to one end of a second linkage rod 5, the other end of the second linkage rod 5 is hinged to the translation assembly; the positions where the first linkage rod 4 and the second linkage rod 5 are hinged to the measuring block 3 are preferably the lower side of the measuring block 3; the distance between the two hinged positions on the first linkage rod 4 is consistent with the distance between the two hinged positions on the second linkage rod 5, forming an isosceles trapezoidal structure, which ensures that the plane where the measuring block 3 is located is always parallel to the center rod 1, and at the same time can reduce the amount of parameters required for obtaining the wall thickness, and improve the accuracy of obtaining the wall thickness; the rear end of the center rod 1 is provided with a zero point positioning block 8, the translation assembly can abut against the zero point positioning block 8, and when the translation assembly abuts against the zero point positioning block 8, the axis of the first linkage rod 4 and the second linkage rod 5 and the axis of the center rod 1 form a non-zero angle; a scale is marked on the center rod 1 from the position of the zero point positioning block 8.

[0054] In the embodiment, the zero point positioning block 8 is provided, which on the one hand restricts the rearward movement position of the translation assembly, and ensures that the axis of the first linkage rod 4 and the second linkage rod 5 and the axis of the center rod 1 form a non-zero angle, i.e. have an upward angle, to ensure that the translation assembly can move smoothly when moving forward; on the other hand, the starting size can be specified, and the obtained wall thickness can be intuitively displayed on the scale.

[0055] In summary, in the embodiment, through the circumferential array of the measuring block 3, synchronous movement, the axis of the center rod 1 and the axis of the small pressure tank 10 are automatically coincided, which provides a basis for accurate wall thickness detection data of the small pressure tank 10; the structure is simple, the measuring block 3 moves with the translation assembly, and the entire wall thickness detection tool can have a minimum radial size, so that the tool can be inserted into the pipe from the tank opening of the small pressure tank 10, thereby effectively realizing the wall thickness detection of the small pressure tank 10; the wall thickness detection tool is a pure mechanical structure, does not need power supply, is not constrained by the detection site environment, and has higher adaptability.

[0056] Embodiment 2

[0057] On the basis of embodiment 1, a specific implementation manner is further proposed.

[0058] In a feasible implementation, the front end of the center rod 1 is provided with a fixed plate 2, the other end of the first linkage rod 4 is hinged to the fixed plate 2, and the vertical distance from the hinged position of the first linkage rod 4 to the axis of the center rod 1 is consistent with the vertical distance from the hinged position of the second linkage rod 5 to the axis of the center rod 1. By setting the fixed plate 2, the height difference of the hinged position is compensated, the isosceles trapezoidal structure is further realized, the introduction of calculation parameters is further reduced, the risk of large error caused by large number of parameters is effectively reduced, and the measurement accuracy is improved.

[0059] In a feasible implementation, the hinged positions of the first linkage rod 4 and the second linkage rod 5 are each provided with a rotating shaft 9, which is respectively rotatably connected with the corresponding hinged component; the hinged component includes the measuring block 3, the fixed plate 2 and the translation assembly, and the hinged first linkage rod 4 and the second linkage rod 5 are realized through the rotating shaft 9; the rotating shaft 9 rotates around its own axis, so that the axis position does not change when the first linkage rod 4 and the second linkage rod 5 rotate, which provides a basic guarantee for the accuracy of subsequent data calculation.

[0060] Embodiment 3

[0061] On the basis of any one of the embodiments 1-2, the specific structure of the translation assembly is described.

[0062] In a first embodiment, the translation assembly is a sleeve, preferably a T-shaped pipe, which can be directly sleeved on the center rod 1 during installation. The sleeve is manually pushed by the detector to move, and then cooperates with the rotation of the first linkage rod 4 and the second linkage rod 5 to change the distance from the measuring block 3 to the center rod 1, so as to realize the alignment of the axis of the center rod 1 with the axis of the small pressure tank 10, and the abutting of the measuring block 3 against the inner wall of the small pressure tank 10, thereby obtaining the inner diameter measurement of the tank belly of the small pressure tank 10, and further realizing the thickness measurement of the small pressure tank 10.

[0063] In a second embodiment, the translation assembly includes a sliding plate 6 and an internally threaded pipe 7, and the internally threaded pipe 7 is rotatably connected with the sliding plate 6. The center rod 1 has an externally threaded section, and the internally threaded pipe 7 is threadedly connected with the externally threaded section. The internally threaded pipe 7 is rotated by the detector to change the connection position of the internally threaded pipe 7 with the center rod 1, that is, to realize the translation of the translation assembly, so as to realize the thickness measurement of the small pressure tank 10 as described in the first embodiment.

[0064] It should be noted that the second embodiment is relative to the first embodiment, and the translation is achieved by threaded connection, which can realize self-locking, thereby facilitating reading, that is, after the detection personnel releases the hand, the position of the translation assembly can also be stable, and the situation that reading cannot be performed due to hand shielding of the detection personnel does not occur; on the other hand, the translation is converted into spiral rotation feeding, the feeding is slow, the movement speed of the measuring block 3 is controlled, and it is ensured that the speed of the measuring block 3 does not appear excessively large, thereby effectively avoiding damage of the wall thickness detection tool and the small pressure tank 10 due to rapid impact of the measuring block 3 and the inner wall of the small pressure tank 10; in addition, based on the conversion of the translation into spiral rotation feeding, the large-stroke spiral feeding realizes small-stroke feeding of the translation, the position of the movement is more detailed, the positions of the translation assembly and the measuring block 3 are adjusted more accurately, and thereby the higher measurement accuracy requirement can be met. Based on the description of this paragraph, the second embodiment is preferred.

[0065] It should be further explained that the outer threaded segment on the center rod 1 can be at a position without a scale on the center rod 1 or at a position with a scale on the center rod 1; if at the position with a scale on the center rod 1, the threaded segment cannot be fully threaded in the circumferential direction, and part of the position needs to be reserved for marking the scale, and this structure is relatively difficult to process, therefore, the outer threaded segment on the center rod 1 is preferably at a position without a scale on the center rod 1.

[0066] Further, a bearing is arranged between the sliding plate 6 and the inner threaded pipe 7, so that the rotation between the sliding plate 6 and the inner threaded pipe 7 is more stable.

[0067] Embodiment 4

[0068] On the basis of embodiments 1-3, further embodiments about the scale are proposed.

[0069] As shown in Figures 2-5 the scale is marked according to the formula about d-x, wherein:

[0070]

[0071] d is the inner diameter of the small pressure tank 10;

[0072] f is the distance from the rotation axis 9 of the first linkage rod 4 and the center rod 1 to the axis of the center rod 1; or / and the distance from the rotation axis 9 of the second linkage rod 5 and the translation assembly to the axis of the center rod 1;

[0073] c is the distance from the rotation axis 9 of the first linkage rod 4 or / and the second linkage rod 5 and the measuring block 3 to the upper surface of the measuring block 3;

[0074] l is the distance between the two hinged positions on the first linkage rod 4, or / and the distance between the two hinged positions on the second linkage rod 5;

[0075] e is the distance between the two projection points of the two hinged positions on the first linkage rod 4 or / and the two hinged positions on the second linkage rod 5 on the center rod 1 when the translation assembly is against the zero positioning block 8;

[0076] x is the distance of the translation assembly movement;

[0077] w is the width of the measuring block 3, which is the direction perpendicular to the axis.

[0078] Through the formula, since f, c, l, e, w are constant values after the production of each wall thickness detection assembly, and the value of x is a variable, a single function relationship is achieved, that is, the size of the inner diameter of the small pressure tank 10 can be directly reflected on the movement amount of the translation assembly, and vice versa, the inner diameter of the small pressure tank 10 can be directly obtained according to the movement amount of the translation assembly.

[0079] Further explanation, in the production of the wall thickness detection assembly, since the values of f, c, l, e are measured from the axis, it is usually inconvenient to measure; in the case of inconvenient measurement, the diameters of the shaft 9 and the center rod 1 can be obtained first, and the second linkage rod 5 is taken as an example for illustration, by measuring the minimum distance between the outer surfaces of the two ends of the second linkage rod 5, and cooperating with the diameter of the shaft 9, the value of l can be obtained; by measuring the minimum distance between the outer surface of the shaft 9 installed on the measuring block 3 and the upper surface of the measuring block 3, and cooperating with the radius (half of the diameter) of the shaft 9, the value of c can be obtained; similarly, the value of f can also be obtained.

[0080] Further, compared with other measuring devices, the wall thickness detection assembly is for small pressure tank 10, which can cause large measurement error even for a small measuring block 3. According to the above formula, the width w of the measuring block 3 is considered, so that for small pressure tank 10, the measurement error caused by the chord formed by the measuring block 3 is effectively avoided. In addition, the wall thickness detection assembly is for small pressure tank 10, and the measuring block 3 is a rectangular body (cuboid or square structure). Compared with other structures of the measuring block, such as the measuring block with a sharp end, the measuring block in the wall thickness detection assembly has multiple position contacts (linear contact in the length direction and point contact with a span in the width direction) between the small pressure tank 10 inner wall, so that the contact between the measuring block 3 and the small pressure tank 10 is more stable, the axis of the center rod 1 coincides with the axis of the small pressure tank 10 more stably, and the measurement data is more accurate. In addition, from the perspective of processing and production, for the production of the measuring block which forms point contact or linear contact with the inner wall of the small pressure tank 10, the production of the rectangular measuring block of the wall thickness detection assembly is simpler, because only the point contact or linear contact in the processing contact position is difficult to control in size precision, and in practice, it is also difficult to achieve theoretical point contact or linear contact. Therefore, the measuring block 3 is designed as a rectangular body in this embodiment.

[0081] Further, after obtaining the inner diameter d of the small pressure tank 10, the thickness y is obtained according to the formula about y-d, wherein:

[0082]

[0083] D is the outer diameter of the small pressure tank 10.

[0084] Embodiment 5

[0085] A wall thickness detection method of a small pressure tank, which applies the wall thickness detection tool of the small pressure tank 10, and includes the following steps:

[0086] S1: moving the translation assembly backward, so that the rear end of the translation assembly abuts against the zero point positioning block 8, at this time, all the measuring blocks 3 are at the limit position close to the center rod 1, and the radial size of the entire wall thickness detection tool is the smallest;

[0087] S2: inserting the front end of the wall thickness detection tool into the small pressure tank 10 from the tank opening of the small pressure tank 10 until the second linkage rod 5 also enters the small pressure tank 10;

[0088] S3: moving the translation assembly forward, and under the cooperation of the first linkage rod 4 and the second linkage rod 5, the measuring block 3 moves away from the center tube until the translation assembly cannot move forward any more;

[0089] S4: read the scale value of the scale coinciding with the back end of the translation assembly, which is the inner diameter of the small pressure tank 10; the scale value is marked according to the formula about d-x, wherein:

[0090]

[0091] d is the inner diameter of the small pressure tank 10;

[0092] f is the distance from the rotation axis 9 line of the first linkage rod 4 and the center rod 1 to the axis of the center rod 1; or / and the distance from the rotation axis 9 line of the second linkage rod 5 and the translation assembly to the axis of the center rod 1;

[0093] c is the distance from the rotation axis 9 line of the first linkage rod 4 or / and the second linkage rod 5 and the measuring block 3 to the upper surface of the measuring block 3;

[0094] l is the distance between the two hinged positions on the first linkage rod 4, or / and the distance between the two hinged positions on the second linkage rod 5;

[0095] e is the distance between the two hinged positions on the first linkage rod 4 or / and the second linkage rod 5 projected on the center rod 1 when the translation assembly abuts against the zero positioning block 8;

[0096] x is the distance of the translation assembly moving;

[0097] w is the width of the measuring block 3;

[0098] S5: move the translation assembly backward, so that the back end of the translation assembly abuts against the zero positioning block 8 again, and take the wall thickness detection tool out of the tank opening of the small pressure tank 10;

[0099] S6: measure the outer diameter of the small pressure tank 10, obtain the wall thickness by twice the wall thickness equaling the outer diameter of the small pressure tank 10 minus the inner diameter, and complete the wall thickness detection of the small pressure tank 10.

[0100] The present application is not limited to the foregoing specific embodiments. The present application extends to any novel feature or any new combination described in this specification, and any novel method or process step or any new combination disclosed.

Claims

1. A wall thickness detection tool for small pressure tanks, characterized by: The invention comprises a central rod (1) and a plurality of measuring blocks (3), wherein the plurality of measuring blocks (3) are arranged in a circumferential array around the axis of the central rod (1), and the front end of each measuring block (3) is hinged to one end of a first linkage rod (4), and the other end of the first linkage rod (4) is hinged to the front end of the central rod (1); the central rod (1) is provided with a translation assembly capable of translation along the axis of the central tube, the rear end of each measuring block (3) is hinged to one end of a second linkage rod (5), and the other end of the second linkage rod (5) is hinged to the translation assembly; ... The distance between the two hinged positions on the movable rod (4) is consistent with the distance between the two hinged positions on the second linkage rod (5); a zero point positioning block (8) is provided at the rear end of the center rod (1), the translation assembly can abut against the zero point positioning block (8), and when the translation assembly abuts against the zero point positioning block (8), the axes of the first linkage rod (4), the second linkage rod (5) and the axis of the center rod (1) form a non-zero angle; starting from the position of the zero point positioning block (8), the center rod (1) is marked with a scale; The measuring block (3) is a rectangular body; the scale marking value is marked according to the formula for dx, where: There are: d is the inner diameter of the small pressure tank (10); f is the distance between the rotation axis (9) line of the first linkage rod (4) and the center rod (1) and the axis of the center rod (1); or / and the distance between the rotation axis (9) line of the second linkage rod (5) and the translation assembly and the axis of the center rod (1); c is the distance from the rotation axis (9) of the first linkage rod (4) or / and the second linkage rod (5) hinged to the measuring block (3) to the upper surface of the measuring block (3); l is the distance between two hinged positions on the first linkage rod (4), or / and the distance between two hinged positions on the second linkage rod (5); e is the distance between the two hinged positions on the first linkage rod (4) and / or the two hinged positions on the second linkage rod (5) projected on the center rod (1) when the translation assembly abuts against the zero-point positioning block (8); x is the distance the translation component moves; w is the width of the measurement block (3); After obtaining the inner diameter d of the small pressure tank (10), the thickness y is obtained according to the formula for yd, where: Where: D is the outer diameter of the small pressure tank (10).

2. The wall thickness detection tool according to claim 1, characterized in that: A fixing plate (2) is provided at the front end of the center rod (1), the other end of the first linkage rod (4) is hinged to the fixing plate (2), and the vertical distance from the hinged position of the first linkage rod (4) and the fixing plate (2) to the axis of the center rod (1) is consistent with the vertical distance from the hinged position of the second linkage rod (5) and the translation assembly to the axis of the center rod (1).

3. The wall thickness detection tool according to claim 1, characterized in that: A rotating shaft (9) is provided at the hinged position of the first linkage rod (4) and the second linkage rod (5), and the rotating shaft (9) is rotatably connected to the corresponding hinged component.

4. The wall thickness detection tool according to claim 1, characterized in that: The translation component is a sleeve.

5. The wall thickness detection tool according to claim 1, characterized in that: The translation assembly comprises a slide plate (6) and an internally threaded tube (7), wherein the internally threaded tube (7) is rotatably connected to the slide plate (6); the central rod (1) is provided with an externally threaded section, and the internally threaded tube (7) is threadably connected to the externally threaded section.

6. The wall thickness detection tool according to claim 5, characterized in that: A bearing is provided between the slide plate (6) and the internally threaded tube (7).

7. A method for detecting the wall thickness of a small pressure tank, using a wall thickness detection tool for a small pressure tank (10) according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Move the translation assembly backward so that the rear end of the translation assembly abuts against the zero point positioning block (8). At this time, all the measuring blocks (3) are at their limit positions close to the center rod (1), and the radial dimension of the entire wall thickness detection tool is the smallest. S2: Extending the front end of the wall thickness detection tool into the small pressure tank (10) from the tank opening of the small pressure tank (10) until the second linkage rod (5) also enters the small pressure tank (10); S3: Moving the translation assembly forward, the translation assembly, with the cooperation of the first linkage rod (4) and the second linkage rod (5), moves the measuring block (3) in a direction away from the central tube until the translation assembly can no longer move forward; S4: reading the scale value of the scale that coincides with the rear end of the translation assembly, which scale value is the inner diameter of the small pressure tank (10); S5: Move the translation assembly backward so that the rear end of the translation assembly abuts against the zero point positioning block (8) again, and remove the wall thickness detection tool from the mouth of the small pressure tank (10); S6: Measure the outer diameter of the small pressure tank (10), and obtain the wall thickness by subtracting the inner diameter from the outer diameter of the small pressure tank (10) by twice the wall thickness, thereby completing the wall thickness detection of the small pressure tank (10).

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