Portable measuring instrument with super-large diameter

Abstract

The utility model relates to the field of measuring equipment, and discloses an oversized-diameter portable measuring instrument which comprises a supporting module, a longitudinal measuring module and a transverse measuring module, the longitudinal measuring module and the transverse measuring module are arranged on the supporting module, and a first connecting rod and a second connecting rod of a supporting part are used for connecting a first supporting part and a third supporting part. The relative position between the supporting parts can be obtained by measuring the first connecting rod and the second connecting rod and the included angle between the first connecting rod and the second connecting rod through the transverse measuring module, and coordinates of three to-be-measured points on a to-be-measured workpiece can be obtained by combining a displacement sensor in the longitudinal measuring module. According to the utility model, the problem that on-site rapid measurement and data acquisition of to-be-measured coordinates of a cylindrical or spherical workpiece with an ultra-large diameter are difficult is solved, and portability, light weight and on-site rapid measurement functions of the measuring instrument are realized.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to a portable measuring instrument with an ultra-large diameter. Background Technology

[0002] In industrial sectors such as aerospace and shipbuilding, the use of large or super-large structural components is becoming increasingly common. These components are often difficult to handle and require precise dimensional measurements to ensure their performance and safety.

[0003] In existing measurement technologies, fixed measuring equipment is usually used to measure cylindrical or spherical workpieces with ultra-large diameters. These devices are often bulky, difficult to carry, and have complex installation and debugging processes, which are not conducive to rapid on-site measurement and data acquisition. Utility Model Content

[0004] The purpose of this invention is to provide a portable measuring instrument for ultra-large diameters that is easy to carry and operate. This measuring instrument can obtain the coordinates of three points on the outer diameter of the workpiece through the transverse measurement module and the longitudinal measurement module, thereby obtaining the diameter of the workpiece.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a portable measuring instrument for ultra-large diameter, including:

[0007] The transverse measurement module is used to measure parameters related to the transverse coordinates of three points on the workpiece to be measured. The workpiece to be measured can be a cylindrical or spherical workpiece.

[0008] The longitudinal measurement module includes a first displacement sensor, a second displacement sensor, and a third displacement sensor arranged sequentially along the transverse direction. The longitudinal measurement module is used to measure the longitudinal coordinates of the three points to be measured.

[0009] The support module includes a first support part, a second support part, and a third support part arranged sequentially in the transverse direction, as well as a first connecting rod for connecting the first support part and the second support part, and a second connecting rod for connecting the second support part and the third support part; wherein the first support part is used to support the first displacement sensor, the second support part is used to support the second displacement sensor, and the third support part is used to support the third displacement sensor.

[0010] Optionally, the position of the first displacement sensor and / or the position of the third displacement sensor relative to the position of the second displacement sensor can be adjusted.

[0011] Optionally, the first link and the second link are rotatably connected, the connection point between the first link and the second link is used to set the second support part, the other end of the first link is used to set the first support part, and the other end of the second link is used to set the third support part;

[0012] The lateral measurement module includes an angle meter for measuring the angle between the first link and the second link.

[0013] Optionally, at least one of the first link and the second link is a telescopic link, the first support portion is capable of telescopically extending relative to the second support portion in the first link direction, and / or, the third support portion is capable of telescopically extending relative to the second support portion in the second link direction.

[0014] Optionally, the first link includes a first support rod and a second support rod that are rotatably connected, the second link includes a third support rod and a fourth support rod that are rotatably connected, the connection point between the second support rod and the third support rod is used to set a second support part, the other end of the first support rod is provided with a first support part, and the other end of the fourth support rod is provided with a third support part;

[0015] The lateral measurement module includes an angle meter for measuring the angle between the first and second supports, as well as the angle between the third and fourth supports.

[0016] Optionally, the second support rod and the third support rod are integrally formed.

[0017] Optionally, at least one of the first and fourth support rods is a telescopic rod.

[0018] Optionally, the positions of the first support and the third support are symmetrically arranged relative to the position of the second support.

[0019] Optionally, the positions of the first displacement sensor and the third displacement sensor are symmetrically arranged relative to the position of the second displacement sensor; the first link and the second link are integrally formed, and the included angle between the first link and the second link is between 120° and 180°; the lateral measurement module includes a measuring ruler for measuring the length of the first link and the second link.

[0020] Optionally, the first displacement sensor, the second displacement sensor, and the third displacement sensor are mechanical displacement sensors.

[0021] The beneficial effects of this utility model are:

[0022] This utility model discloses an ultra-large diameter portable measuring instrument, which includes: a transverse measuring module, a longitudinal measuring module, and a support module. The transverse measuring module measures parameters related to the transverse coordinates of three test points on the workpiece. The longitudinal measuring module includes a first displacement sensor, a second displacement sensor, and a third displacement sensor arranged sequentially along the transverse direction, and measures the longitudinal coordinates of the three test points. The support module includes a first support portion, a second support portion, and a third support portion arranged sequentially along the transverse direction, as well as a first connecting rod connecting the first and second support portions and a second connecting rod connecting the second and third support portions. The first support portion supports the first displacement sensor, the second support portion supports the second displacement sensor, and the third support portion supports the third displacement sensor. The design of the aforementioned support module, longitudinal measurement module, and transverse measurement module enables the determination of the coordinates of any three points on the outer diameter of a spherical or cylindrical workpiece. This allows users to instantly calculate the diameter of the workpiece on-site by applying the three-point positioning principle, thereby achieving portability and lightweighting of the measuring instrument, improving the efficiency and flexibility of on-site operations, and meeting the needs of industrial inspection for rapid and accurate measurement. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a portable measuring instrument with an ultra-large diameter provided by this utility model;

[0024] Figure 2 A schematic diagram of another ultra-large diameter portable measuring instrument provided by this utility model;

[0025] Figure 3 A schematic diagram of the structure of another ultra-large diameter portable measuring instrument provided by this utility model;

[0026] Figure 4 A schematic diagram of the structure of another ultra-large diameter portable measuring instrument provided by this utility model;

[0027] Figure 5 A schematic diagram of the structure of another ultra-large diameter portable measuring instrument provided by this utility model;

[0028] Figure 6 for Figure 1 The diagram shows the structure of the longitudinal measurement module of the ultra-large diameter portable measuring instrument when it contacts the workpiece for testing. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0030] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that the directional terms "upper," "lower," "left," and "right" used in this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first" and "second" are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The term "comprising" and its variations as used in this utility model are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0032] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0033] It should be noted that the terms "a" and "a plurality of" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0034] In this embodiment, Figure 1 This is a schematic diagram of the structure of a portable measuring instrument with an ultra-large diameter provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the ultra-large diameter portable measuring instrument 100 includes:

[0035] The transverse measurement module 10 is used to measure parameters related to the transverse coordinates of three test points on the workpiece to be measured. The workpiece to be measured is a cylindrical workpiece or a spherical workpiece.

[0036] The longitudinal measurement module 20 includes: a first displacement sensor 21, a second displacement sensor 22, and a third displacement sensor 23 arranged sequentially along the transverse direction. The longitudinal measurement module 20 is used to measure the longitudinal coordinates of the three points to be measured.

[0037] The support module 30 includes: a first support portion 31, a second support portion 32, and a third support portion 33 arranged sequentially in the transverse direction; a first connecting rod 34 for connecting the first support portion 31 and the second support portion 32; and a second connecting rod 35 for connecting the second support portion 32 and the third support portion 33; wherein the first support portion 31 is used to support the first displacement sensor 21, the second support portion 32 is used to support the second displacement sensor 22, and the third support portion 33 is used to support the third displacement sensor 23.

[0038] The point to be measured can be understood as the specific location on a cylindrical or spherical workpiece that needs to be precisely measured. The lateral and longitudinal coordinates can be understood as the relative position coordinates of the point to be measured along the X-axis and Y-axis directions in a Cartesian coordinate system on a horizontal reference plane. The lateral measurement module 10 and the longitudinal measurement module 20 can be understood as modules used to measure distances along the X-axis and Y-axis directions in this coordinate system, respectively. The first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 23 in the longitudinal measurement module 20 can be understood as three sets of parallel distance sensors capable of measuring distances along the Y-axis direction. The support module 30 can be understood as a bracket used to fix and support each displacement sensor. The first support part 31, the second support part 32, and the third support part 33 can be understood as the base on the bracket used to place the first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 23. In one embodiment, the displacement sensor and the support part can be fixed by an interference fit, and the support part and the connecting rod can be movably connected.

[0039] Specifically, the first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 23 can be mechanical displacement sensors, which are fixed on the first support part 31, the second support part 32, and the third support part 33 of the support module 30, respectively. The three sets of sensors have the same measurement direction and are defined as longitudinal, and are used to measure the longitudinal coordinates of three test points (e.g., the first test point, the second test point, and the third test point) on the workpiece. There is a first lateral distance W1 between the first displacement sensor 21 and the second displacement sensor 22, and a second lateral distance W2 between the second displacement sensor 22 and the third displacement sensor 23. The lateral measurement module 10 can obtain parameters related to the first gap W1 and the second gap W2. In this structure, when the first support 31, the second support 32 and the third support 33 are located on the same straight line, the lateral measurement module 10 can be a measuring ruler to directly measure the first gap W1 between the first support 31 and the second support 32, and measure the second gap W2 between the second support 32 and the third support 33. At this time, the first gap W1 is the length of the first connecting rod 34 and the second gap W2 is the length of the second connecting rod 35.

[0040] For example, Figure 6 for Figure 1 The diagram shows the structure of the longitudinal measurement module of the ultra-large diameter portable measuring instrument when it contacts the workpiece for testing. Figure 6 As shown, the longitudinal coordinates of the first, second, and third test points are obtained by the first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 22, respectively. Let the first test point be B, the second test point be A, and the third test point be C. The second test point is selected as the origin (0,0) of the coordinate system. The horizontal distance of point B on the measured part relative to the origin A is obtained through the transverse measurement module 10, which is the first distance W1 between the first displacement sensor 21 and the second displacement sensor 22. The vertical distance of point B relative to the origin A is determined by subtracting the measurement value of the second displacement sensor 22 from the measurement value of the first displacement sensor 21. Similarly, the horizontal distance of point C relative to the origin A is the first distance W1 between the third displacement sensor 23 and the second displacement sensor 22, obtained through the transverse measurement module 10. The vertical distance of point C relative to the origin A is the difference between the measurement value of the third displacement sensor 23 and the measurement value of the second displacement sensor 22. Based on these measurements, the coordinates of point B can be determined as (x1, y1), and the coordinates of point C can be determined as (x2, y2). That is, the coordinates are A(0.0), B(x1, y1), and C(x2, y2). According to the equation of the perpendicular bisector of AB: Equation of the perpendicular bisector of AC: Finding the coordinates of the intersection point gives us the coordinates of the center O(a, b) and the diameter.

[0041] Therefore, in this embodiment, through the coordinated operation of the lateral and longitudinal measurement modules, supplemented by a stable support module, the user can efficiently obtain the lateral and longitudinal coordinates of three measurement points on the workpiece. Combining these coordinates yields the complete coordinates of the measurement points, and the center coordinates and diameter of the workpiece can then be quickly obtained using the three-point method. Compared to traditional measuring instruments, the ultra-large diameter portable measuring instrument 100 in this embodiment is compact, easy to operate, portable, and practical, greatly simplifying the measurement process and improving work efficiency.

[0042] Optionally, the position of the first displacement sensor 31 and / or the position of the third displacement sensor 33 relative to the position of the second displacement sensor 32 can be adjusted.

[0043] By adjusting the position of the first displacement sensor 31 and / or the position of the third displacement sensor 33 relative to the second displacement sensor 32, the measuring instrument can be adapted to the measurement of workpieces with different diameters, making it more widely applicable and better adaptable.

[0044] Specifically, the position of the displacement sensors can be adjusted using the following two methods to adapt to the measurement of workpieces with different diameters, significantly improving the applicability and adaptability of the measuring instrument. For example, the position of the support can be adjusted by setting multiple optional support points on the support module 30. Alternatively, the position of the support can be adjusted by installing a slide rail and placing the support on the slide rail, thereby adjusting the spacing between the displacement sensors. Alternatively, adjustment can be achieved by rotating and / or extending the connecting rod. All three methods can effectively change the position of the first displacement sensor 31 and / or the third displacement sensor 33 relative to the second displacement sensor 32, thus enabling it to adapt to the measurement of workpieces with different diameters, ultimately improving the applicability and adaptability of the equipment.

[0045] Optionally, Figure 2 A schematic diagram of another ultra-large diameter portable measuring instrument provided by this utility model is shown below. Figure 2 As shown, the first link 34 and the second link 35 are rotatably connected. The connection point between the first link 34 and the second link 35 is used to set the second support part 32. The other end of the first link 34 is used to set the first support part 31, and the other end of the second link 35 is used to set the third support part 33.

[0046] Specifically, the first connecting rod 34 connects the first support portion 31 and the second support portion 32, and the second connecting rod 35 connects the second support portion 32 and the third support portion 33. The first connecting rod 34 and the second connecting rod 35 are movably connected at the second support portion 32, and both the first connecting rod 34 and the second connecting rod 35 can rotate in the xy plane about the second support portion 32 as an axis. Furthermore, when the first connecting rod 34 rotates around the second support portion 32, the position of the first displacement sensor 21 relative to the second displacement sensor 22 can be adjusted; when the second connecting rod 35 rotates around the second support portion 32, the position of the third displacement sensor 23 relative to the second displacement sensor 22 can be adjusted. This allows for better adaptation to workpieces of different diameters.

[0047] Adaptably, in this structure, when the first support 31, the second support 32, and the third support 33 are located on the same straight line, the lateral measuring module 10 can be a measuring ruler to directly measure the first distance W1 between the first support 31 and the second support 32, and the second distance W2 between the second support 32 and the third support 33. In this case, the first distance W1 is the length of the first connecting rod 34, and the second distance W2 is the length of the second connecting rod 35. When the first support 31, the second support 32, and the third support 33 are not located on the same straight line, the lateral measuring module 10 includes an angle gauge and a measuring ruler to achieve accurate measurement of the workpiece dimensions. Specifically, in this embodiment, the determination of the first distance W1 depends on the length L1 of the first connecting rod 34 and its angle θ1 with the horizontal direction. The value of θ1 is obtained by measuring with an angle gauge, and combined with the L1 data obtained by the measuring ruler, the first distance W1 = L1 * cos(θ1). Similarly, to determine the second spacing W2, firstly, use an angle meter to measure the angle θ2 between the second link 35 and the horizontal direction; then, measure the length L2 of the second link 35 using a measuring ruler; finally, substitute it into the formula D2=L2*cos(θ2) to obtain the second spacing.

[0048] Optionally, Figure 3 This is a structural schematic diagram of another ultra-large diameter portable measuring instrument provided by this utility model. (See attached diagram.) Figure 3 As shown, at least one of the first link 34 and the second link 35 is a telescopic link, the first support part 31 can extend and retract relative to the second support part 32 in the direction of the first link 34, and / or, the third support part 33 can extend and retract relative to the second support part 32 in the direction of the second link 35.

[0049] In this context, a telescopic rod can be understood as a rod-shaped support structure that achieves extension and retraction through any means, such as rotating threads, hydraulic pressure, or gear racks.

[0050] Specifically, provided that the support directions of the first support part 31, the second support part 32 and the third support part 33 are consistent, at least one of the first connecting rod 34 and the second connecting rod 35 can be a telescopic rod. When the first connecting rod 34 is a telescopic rod, the distance between the first support part 31 and the second support part 32 can be adjusted. Similarly, when the second connecting rod 35 is a telescopic rod, the distance between the second support part 32 and the third support part 33 can be adjusted.

[0051] In this example, the first link 34 and / or the second link 35 are telescopic. If the first link 34 is a telescopic rod, the position of the first displacement sensor 31 relative to the second displacement sensor 32 can be adjusted by adjusting the length of the first link 34. Similarly, if the second link 35 is a telescopic rod, the position of the third displacement sensor 33 relative to the second displacement sensor 32 can be adjusted by adjusting the length of the second link 35. By adjusting the first gap W1 and the second gap W2, the measurement range of the measuring instrument can be increased, making it adaptable to more workpieces with different outer diameters.

[0052] In one embodiment, the first link 34 and / or the second link 35 can both rotate in the xy plane about the second support 32 as an axis to further increase the measurement range of the measuring instrument and make it adaptable to more workpieces with different outer diameters.

[0053] Optionally, Figure 4 This is a structural schematic diagram of another ultra-large diameter portable measuring instrument provided by this utility model. (See attached diagram.) Figure 4 As shown, the first link 34 includes a first support rod 41 and a second support rod 42 that are rotatably connected, and the second link 35 includes a third support rod 43 and a fourth support rod 44 that are rotatably connected. The connection point between the second support rod 42 and the third support rod 43 is used to set the second support part 32. The other end of the first support rod 41 is provided with the first support part 31, and the other end of the fourth support rod 44 is provided with the third support part 33.

[0054] The rotatable connection structures between the first support rod 41 and the second support rod 42, and between the third support rod 43 and the fourth support rod 44, are all related to... Figure 2 The rotating structures shown are identical. The first support rod 41 can rotate around the second support rod 42, and the fourth support rod 44 can rotate around the third support rod 43.

[0055] Specifically, the first support rod 41, the second support rod 42, the third support rod 43, and the fourth support rod 44 are located on the same horizontal plane. The first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 32 are also located on the same horizontal plane, with the two planes arranged parallel to each other to prevent the displacement sensors from colliding with the support rods. For example, the first displacement sensor 21, the second displacement sensor 22, and the third displacement sensor 23 are on the same horizontal plane and are all installed below the support rods. The length of the first support rod 41 is shorter than the length of the second support rod 42, and the length of the fourth support rod 44 is shorter than the length of the third support rod 43, to ensure that the first displacement sensor 21 and the third displacement sensor 23 do not collide.

[0056] In one embodiment, the first support rod 41 and the second support rod 42 are rotatably connected, so that when the first support rod 41 rotates around the second support rod 42, the relative position between the first displacement sensor 21 and the second displacement sensor 22 can be adjusted. Similarly, the third support rod 43 and the fourth support rod 44 are rotatably connected, so that when the fourth support rod 44 rotates around the third support rod 43, the relative position between the third displacement sensor 23 and the second displacement sensor 22 can be adjusted. Alternatively, the second support rod 42 and the third support rod 43 can be integrally formed or rotatably connected. When the second support rod 42 and the third support rod 43 are integrally formed, manufacturing costs can be reduced. When the second support rod 42 and the third support rod 43 are rotatably connected, the measurement range can be increased.

[0057] However, it should be noted that in any of the above embodiments, regardless of the structure adopted, the first support part 31, the second support part 32 and the third support part 33 must be on the same horizontal plane.

[0058] Adaptively, in this structure, the lateral measurement module may include an angle gauge and a measuring ruler. The angle gauge is used to measure the angle θ1 between the first support rod 41 and the second support rod 42, and the angle θ2 between the third support rod 43 and the fourth support rod 44. The measuring ruler is used to measure the length of the support rod or connecting rod.

[0059] Specifically, in this embodiment, the determination of the first spacing W1 depends on the length L11 of the first support rod 41, the length L12 of the second support rod 42, and the angle θ1 between the first support rod 41 and the second support rod 42. The value of θ1 is obtained by measuring with an angle meter, and combined with the data of L11 and L12 obtained by a measuring ruler, the first spacing W1 = L12 - L11 * cos(θ1). Similarly, for the determination of the second spacing W2, after measuring the length L13 of the third support rod 43, the length L14 of the fourth support rod 44, and the angle θ2 formed between them, these values ​​are substituted into W2 = L13 - L14 * cos(θ2).

[0060] Furthermore, in this example, when the first support rod 41 and the fourth support rod 44 rotate inward toward the position of the second support point 32, the lateral distance between the first displacement sensor 31 and the third displacement sensor 33 decreases, which makes it easier to measure workpieces with smaller outer diameters; when the first support rod 41 and the fourth support rod 44 rotate inward toward the position of the second support point 32, the lateral distance between the first displacement sensor 31 and the third displacement sensor 33 increases, which makes it easier to measure workpieces with larger outer diameters.

[0061] Optionally, the positions of the first support portion 31 and the third support portion 33 are symmetrically arranged relative to the position of the second support portion 32.

[0062] The symmetrical arrangement can be understood as having the second support 32 as the axis of symmetry, with the first support 31 and the third support 33 installed on both sides of the second support 32, and their distances from the second support 32 are equal.

[0063] Specifically, to ensure installation symmetry, identical connecting rods can be used; that is, the first connecting rod 34 and the second connecting rod 35 can have the same length and structure. Furthermore, if at least one telescopic rod exists in the first connecting rod 34 or the second connecting rod 35, the length of the telescopic rod can be adjusted to ensure that the first spacing W1 equals the second spacing W2. If the first connecting rod 34 or the second connecting rod 35 can be rotatably connected to other structures, symmetry can be ensured by adjusting angles θ1 and θ2. When the above measures are implemented, a rectangular coordinate system can be established with the second support 32 as the origin. In this coordinate system, since the positions of the first support 31 and the third support 33 are symmetrically arranged relative to the position of the second support 32, the position of the third support 33 relative to the second support 32 can be obtained simply by calculating the position of the first support 31 relative to the second support 32.

[0064] Optionally, Figure 5 A structural schematic diagram of another ultra-large diameter portable measuring instrument provided by this utility model is shown below. Figure 5 As shown, the positions of the first displacement sensor 31 and the third displacement sensor 33 are symmetrically arranged relative to the position of the second displacement sensor 32; the first connecting rod 34 and the second connecting rod 35 are integrally formed, and the included angle between the first connecting rod 34 and the second connecting rod 35 can be 157.38°.

[0065] When the included angle between the first link 34 and the second link 35 is 157.38°, the ratio of the lateral distance to the longitudinal distance of the first support part 31 relative to the second support part 32 is approximately 5:1.

[0066] Specifically, the first connecting rod 34 and the second connecting rod 35 are integrally formed structures, θ1=θ2=11.31°. The support structure 30 is provided with a first support part 31, a second support part 32 and a third support part 33 with fixed positions. If a fixed workpiece is to be measured and does not need to be adapted to workpieces of different sizes, a connecting rod of fixed length is used and connected at an angle of 157.38° or other convenient angles. The position of the first support part 31 relative to the second support part 32 and the position of the third support part 33 relative to the second support part 32 can be obtained by measuring the length of the connecting rod once during the production process, without having to repeat the measurement every time.

[0067] In this embodiment, the integral molding of the first link 34 and the second link 35 not only saves manufacturing costs, but also confirms the relative positions of the first support 31, the second support 32 and the third support 33, thereby saving time in measuring the lateral spacing using the lateral measurement module 10 and facilitating recording and calculation.

[0068] Optionally, the first displacement sensor 31, the second displacement sensor 32, and the third displacement sensor 33 are mechanical displacement sensors.

[0069] Among them, mechanical displacement sensors, also known as linear sensors, have the core function of indirectly determining length by accurately measuring the displacement distance generated at the measuring end.

[0070] Specifically, mechanical displacement sensors with a displacement length of 10-50 mm and a measurement accuracy of 3-10 micrometers can be used as displacement sensors.

[0071] For example, a mechanical displacement sensor with a measurement range of 20-30 mm and an accuracy of 3-5 micrometers is preferred. For instance, an INSIZE digital display watch 2103-25 can be used as a displacement sensor. The mechanical displacement sensor includes a probe and a main body structure. The main body structure has a mechanical or electronic dial. When the probe contacts the workpiece to be measured, it retracts, and the dial on the main body structure can read the corresponding distance of the probe retraction. In this embodiment, the mechanical displacement sensor contacts the outer wall of the workpiece to be measured. When the reading of the mechanical sensor changes from 0, it indicates that contact has been made with the workpiece.

[0072] In summary, the ultra-large diameter portable measuring instrument provided by this utility model embodiment includes a transverse measuring module, a longitudinal measuring module, and a support module. The longitudinal measuring module is mounted on the support module. A first connecting rod and a second connecting rod of the support module connect a first support portion and a third support portion. The coordinates of three measurement points on the workpiece can be obtained through the transverse and longitudinal measuring modules, thereby enabling the calculation of the workpiece's diameter. This allows users to instantly calculate the workpiece's diameter on-site by applying the three-point positioning principle, thus achieving portability and lightweight design of the measuring instrument, improving the efficiency and flexibility of on-site operations, and meeting the needs of industrial inspection for rapid and accurate measurement.

[0073] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and includes many other embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A portable measuring instrument with an ultra-large diameter, characterized in that, include: A transverse measurement module is used to measure parameters related to the transverse coordinates of three test points on the workpiece to be measured, wherein the workpiece to be measured is a cylindrical workpiece or a spherical workpiece; The longitudinal measurement module includes a first displacement sensor, a second displacement sensor, and a third displacement sensor arranged sequentially along the transverse direction. The longitudinal measurement module is used to measure the longitudinal coordinates of the three points to be measured. The support module includes a first support part, a second support part, and a third support part arranged sequentially in the transverse direction, as well as a first connecting rod for connecting the first support part and the second support part, and a second connecting rod for connecting the second support part and the third support part; wherein the first support part is used to support the first displacement sensor, the second support part is used to support the second displacement sensor, and the third support part is used to support the third displacement sensor.

2. The ultra-large diameter portable measuring instrument according to claim 1, characterized in that, The position of the first displacement sensor and / or the position of the third displacement sensor are adjustable relative to the position of the second displacement sensor.

3. The ultra-large diameter portable measuring instrument according to claim 2, characterized in that, The first link and the second link are rotatably connected. The connection point between the first link and the second link is used to set the second support part. The other end of the first link is used to set the first support part, and the other end of the second link is used to set the third support part. The lateral measurement module includes an angle meter for measuring the angle between the first link and the second link.

4. The ultra-large diameter portable measuring instrument according to claim 3, characterized in that, At least one of the first and second links is a telescopic rod, the first support portion is capable of telescopic extension and retraction relative to the second support portion in the direction of the first link, and / or the third support portion is capable of telescopic extension and retraction relative to the second support portion in the direction of the second link.

5. The ultra-large diameter portable measuring instrument according to claim 2, characterized in that, The first link includes a first support rod and a second support rod that are rotatably connected. The second link includes a third support rod and a fourth support rod that are rotatably connected. The connection point between the second support rod and the third support rod is used to set a second support part. The other end of the first support rod is provided with the first support part, and the other end of the fourth support rod is provided with the third support part. The lateral measurement module includes an angle meter for measuring the angle between the first support rod and the second support rod, as well as the angle between the third support rod and the fourth support rod.

6. The portable measuring instrument for ultra-large diameters according to claim 5, characterized in that, The second support rod and the third support rod are integrally formed.

7. The ultra-large diameter portable measuring instrument according to claim 5, characterized in that, At least one of the first and fourth support rods is a telescopic rod.

8. The ultra-large diameter portable measuring instrument according to claim 5, characterized in that, The positions of the first support portion and the third support portion are symmetrically arranged relative to the position of the second support portion.

9. The ultra-large diameter portable measuring instrument according to claim 1, characterized in that, The positions of the first displacement sensor and the third displacement sensor are symmetrically arranged relative to the position of the second displacement sensor. The first connecting rod and the second connecting rod are integrally formed, and the included angle between the first connecting rod and the second connecting rod is between 120° and 180°; The lateral measurement module includes a measuring ruler for measuring the lengths of the first link and the second link.

10. The ultra-large diameter portable measuring instrument according to claim 1, characterized in that, The first displacement sensor, the second displacement sensor, and the third displacement sensor are mechanical displacement sensors.

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