An external taper measuring device

Abstract

The utility model belongs to mechanical measurement technical field provides a kind of outer taper measuring device, the device includes shell, sleeve and displacement detection element.The shell inside is equipped with the shell inner hole along axial extension, the sleeve coaxially is arranged in the shell inner hole, and can slide along axial direction;The displacement detection element is installed in the top of the shell, and its measuring rod extends into the shell inner hole, and is in abutment with the upper end surface of the sleeve;The sleeve inside is equipped with sleeve inner hole, the sleeve inner hole opens in the lower end surface of sleeve, the lower end opening of the shell inner hole and the sleeve inner hole is used to contact the outer conical surface of measured workpiece simultaneously, and the displacement detection element is used to detect the axial displacement of the sleeve relative to the shell.The device is compact in structure, clear in reference, convenient to operate, suitable for high-precision taper detection on site, effectively improves detection accuracy and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical measurement technology and relates to an external taper measuring device. This device is suitable for production and assembly scenarios with high requirements for taper angle accuracy, such as aviation and precision manufacturing. Background Technology

[0002] In the fields of aviation, aerospace, precision instruments, and high-end equipment manufacturing, many structural components use external conical surfaces as positioning or connection features, such as aircraft computer mounting brackets, engine mounts, and hydraulic joints. The dimensional accuracy of the cone angle of these parts with external conical surfaces directly affects the coaxiality, sealing performance, and load-bearing reliability of the assembly. If the cone angle exceeds the tolerance, it can lead to assembly difficulties at best, and structural loosening or even failure at worst, posing a safety hazard for the long-term operation of the product.

[0003] Currently, the detection of the outer conical surface mainly relies on the following methods: (1) Using a standard taper ring gauge for go / no-go inspection can only determine whether it is qualified or not, but cannot obtain the specific taper angle value; (2) The use of sine gauges in conjunction with gauge blocks and dial indicators for measurement is cumbersome, requires high environmental and personnel skills, and is difficult to use for rapid on-site testing; (3) Using a coordinate measuring machine (CMM) for digital scanning is highly accurate, but the equipment is expensive and inefficient, and it is not suitable for online sampling inspection in the mass production process.

[0004] In addition, existing simple measuring tools generally have problems such as unclear reference, insufficient contact rigidity, and poor repeatability. Especially when measuring small cone angles or short cone surface workpieces, they are prone to misjudgment due to uneven human force application or structural deformation.

[0005] Therefore, there is an urgent need for a dedicated external taper measuring device with a reasonable structure, clear reference, simple operation, and high repeatability to meet the quality control requirements in high-reliability manufacturing scenarios. Utility Model Content

[0006] In order to solve the technical problems of low measurement accuracy, poor repeatability, and reliance on complex equipment or human experience in the existing technology, and to reduce the misjudgment rate in the testing process and improve the accuracy and efficiency of measuring the cone angle of external conical workpieces, this utility model discloses an external cone measuring device, which includes a shell, a sleeve and a displacement detection element.

[0007] The outer shell has an axially extending inner hole, and the sleeve is coaxially disposed in the inner hole and can slide axially. The displacement detection element is installed on the top of the housing, and its probe extends into the inner hole of the housing and abuts against the upper end face of the sleeve. The sleeve has an inner hole that opens at the lower end face of the sleeve. The lower end openings of the outer shell and the inner hole of the sleeve are used to simultaneously contact the outer conical surface of the workpiece being measured. The displacement detection element is used to detect the axial displacement of the sleeve relative to the outer shell.

[0008] Furthermore, the displacement detection element is a dial indicator.

[0009] Furthermore, it also includes an elastic reset member, which is disposed between the upper end face of the sleeve and the top of the inner hole of the outer shell. In a free state, the sleeve is pushed downward so that the lower end face of the inner hole of the outer shell is flush with the lower end face of the inner hole of the sleeve.

[0010] Furthermore, the elastic reset element is a pre-compressed elastic element, which is a spring or an elastic body.

[0011] Preferably, the elastic reset element is a spring, which is coaxially sleeved on the measuring rod of the displacement detection element, with its upper end abutting the bottom of the inner hole of the outer shell and its lower end abutting the upper end face of the sleeve.

[0012] Furthermore, the sleeve sidewall is provided with a sleeve limiting groove extending axially, and a second bolt is threaded onto the outer shell. The end of the second bolt passes through the outer shell and extends into the sleeve limiting groove. When the sleeve slides axially, it contacts the upper or lower end face of the sleeve limiting groove to limit the sliding stroke of the sleeve.

[0013] Furthermore, the diameter D of the inner hole of the outer shell is greater than the diameter d of the inner hole of the sleeve; the roundness error of both the inner hole of the outer shell and the inner hole of the sleeve is less than 0.008 mm, neither of the end faces of the holes is chamfered, and their respective lower end faces are perpendicular to the central axis of the device.

[0014] Furthermore, the inner hole of the sleeve is a through hole or a stepped hole, and the inner circumference of its lower opening forms the contact area with the outer conical surface of the workpiece being measured.

[0015] Furthermore, the displacement detection element is detachably fixed to the top of the housing by a first bolt, and the outer circle of the displacement detection element is clearance-fitted with the mounting hole of the housing.

[0016] Furthermore, it also includes a handle, which is installed on the top of the displacement detection element by a threaded connection.

[0017] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least: 1. It adopts a double-diameter inner hole as the measurement reference, with a clear structural principle, avoiding human reading errors; 2. The floating sleeve and spring reset design enables adaptive contact, avoids overpressure, and protects the dial indicator; 3. The sleeve limit groove and the limit bolt are matched to prevent damage from overtravel and improve durability; 4. The overall coaxial rigid structure, combined with a high-precision inner hole, significantly improves measurement repeatability and accuracy, making it suitable for rapid on-site testing; 5. Portable, purely mechanical structure design, low cost, and easy maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the external taper measuring device of this utility model; Figure 2 This is a schematic diagram of the external taper measuring device of this utility model measuring the external taper of a workpiece; Among them, 1. Handle; 2. Displacement detection element; 3. First bolt; 4. Outer shell; 41. Inner hole of outer shell; 5. Elastic reset element; 6. Sleeve; 61. Sleeve limiting groove; 62. Inner hole of sleeve; 7. Second bolt; 10. Workpiece. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features of the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0023] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] This utility model discloses an external taper measuring device. See [link to relevant documentation]. Figure 1 and Figure 2 As shown, the device includes a housing 4, a sleeve 6, and a displacement detection element 2. The device is used to measure the outer taper of the workpiece 10.

[0026] In one embodiment, such as Figure 1 As shown, the outer casing 4 has an axially extending inner hole 41 inside, and the sleeve 6 is coaxially disposed in the inner hole 41 and can slide axially. The displacement detection element 2 is installed on the top of the outer casing 4, and its probe extends into the inner hole 41 and abuts against the upper end face of the sleeve 6. The sleeve 6 has an inner hole 62 inside, which opens at the lower end face of the sleeve 6. The lower end openings of the outer casing inner hole 41 and the inner hole 62 are used to simultaneously contact the outer conical surface of the workpiece being measured. The displacement detection element 2 is used to detect the axial displacement of the sleeve 6 relative to the outer casing 4.

[0027] In one embodiment, such as Figure 1 As shown, the displacement detection element 2 is a dial indicator.

[0028] In one embodiment, such as Figure 1As shown, it also includes an elastic reset member 5, which is disposed between the upper end face of the sleeve 6 and the top of the inner hole of the outer shell 4. In the free state, the sleeve 6 is pushed downward so that the lower end face of the inner hole 41 of the outer shell and the inner hole 62 of the sleeve remains flush.

[0029] In one embodiment, the elastic reset member 5 is an elastic element in a pre-compressed state, and the elastic element is a spring or an elastic body.

[0030] In a preferred embodiment, such as Figure 1 As shown, the elastic reset member 5 is a spring, which is coaxially sleeved on the measuring rod of the displacement detection element 2. Its upper end abuts against the bottom of the inner hole 41 of the outer shell 4, and its lower end abuts against the upper end face of the sleeve 6.

[0031] In a preferred embodiment, the elastomer can be a cylindrical elastic block made of elastomers such as oil-resistant rubber or polyurethane. The elastomer is in a pre-compressed state during assembly to eliminate gaps and ensure initial contact consistency.

[0032] In one embodiment, such as Figure 1 As shown, the sleeve 6 has an axially extending sleeve limiting groove 61 on its side wall. The outer shell 4 is threaded with a second bolt 7. The end of the second bolt 7 passes through the outer shell 4 and extends into the sleeve limiting groove 61. When the sleeve 6 slides axially, it contacts the upper or lower end face of the sleeve limiting groove 61 to limit the sliding stroke of the sleeve 6.

[0033] In one embodiment, such as Figure 1 As shown, the diameter D of the inner hole 41 of the outer shell is greater than the diameter d of the inner hole 62 of the sleeve; the roundness error of the inner hole 41 of the outer shell and the inner hole 62 of the sleeve is less than 0.008 mm, the end faces of the holes of both are not chamfered, and their lower end faces are perpendicular to the central axis of the device.

[0034] In one embodiment, such as Figure 2 As shown, the inner hole 62 of the sleeve is a through hole or a stepped hole, and the inner circumference of its lower opening forms the contact part with the outer conical surface of the workpiece being measured.

[0035] In one embodiment, such as Figure 1 As shown, the displacement detection element 2 is detachably fixed to the top of the housing 4 by the first bolt 3, and the outer circle of the displacement detection element 2 and the mounting hole of the housing 4 are in clearance fit.

[0036] In a preferred embodiment, such as Figure 1 As shown, it also includes a handle 1, which is installed on the top of the displacement detection element 2 by means of a threaded connection.

[0037] The process of measuring the outer taper of workpiece 10 using the above-mentioned device is as follows: Step 1: Perform zero calibration Place the device on a high-precision flat plate or standard gauge block, and gently press it so that the lower end face of the inner hole 41 of the outer shell and the inner hole 62 of the sleeve are completely aligned with the reference plane. At this time, adjust the pointer of the displacement detection element 2 to the "0" position to complete the initial state zeroing.

[0038] Step 2: Contact the workpiece being tested Holding handle 1, place the device vertically on the conical surface of the workpiece to be measured, and slowly press down so that the lower opening edges of the inner hole 41 of the outer shell and the inner hole 62 of the sleeve simultaneously contact the outer conical surface. Due to the slope of the conical surface, the contact point of the inner hole 62 of the sleeve with a smaller diameter is higher than the contact point of the inner hole 41 of the outer shell, causing the sleeve 6 to slide upward by being pushed by the conical surface.

[0039] Step 3: Read the displacement value The axial displacement of sleeve 6 is transmitted to displacement detection element 2 through the measuring rod, and the displacement A (unit: mm) is read directly from the dial. This displacement A is the axial distance between the two contact points.

[0040] Step 4: Determine the results Based on the known values ​​of D and d, the formula can be used: Calculate the theoretical cone angle α. In actual production, a table of correspondence between the value of α and the acceptable cone angle range is usually established in advance. On-site, it is only necessary to compare whether α is within the allowable range to quickly determine whether the workpiece is qualified.

[0041] Step 5: Perform reset and repeat measurement. After the device is lifted, the elastic reset component 5 automatically resets the sleeve 6 to its initial flush position, allowing for the next measurement.

[0042] The measurement process is simple to operate and responds quickly. A single measurement can be completed within 10 seconds, and the repeatability error can be controlled within ±2′, which fully meets the requirements of high reliability testing in fields such as aviation.

[0043] The embodiments of this utility model achieve the following technical effects: 1. A high-reliability measurement benchmark is formed by dual-diameter inner holes: the inner holes 41 of the outer shell with known diameters D and d and the inner holes 62 of the sleeve simultaneously contact the outer conical surface of the workpiece being measured, forming two definite spatial contact points, avoiding the uncertainty caused by single-point measurement, and significantly improving measurement repeatability and accuracy.

[0044] 2. The floating sleeve and spring reset structure achieve adaptive contact: The sleeve 6 can float axially under the action of the elastic reset element 5, ensuring that the lower end faces of the two inner holes always gently and synchronously fit the outer conical surface, which not only ensures the effectiveness of contact, but also avoids overpressure damage to the workpiece or dial indicator.

[0045] 3. The sleeve limiting groove and limiting bolt provide mechanical protection: The sleeve limiting groove 61 cooperates with the second bolt 7 to effectively limit the sliding stroke of the sleeve, prevent the spring from being crushed or the dial indicator from being damaged due to accidental overload, and improve the durability of the device.

[0046] 4. High geometric precision inner hole ensures measurement consistency: The inner hole 41 of the outer shell and the inner hole 62 of the sleeve are required to have a roundness error of less than 0.008 mm, no chamfer on the end face of the hole, and the end face is perpendicular to the center line. The reference error is eliminated from the structural source to ensure that the measurement results of different batches are comparable.

[0047] 5. Overall coaxial rigid design for easy handheld operation: The displacement detection element 2, the outer shell 4 and the sleeve 6 are strictly coaxial, and together with the top handle 1, it can achieve stable one-handed operation, which is suitable for rapid sampling inspection in workshop, assembly line and other field environments.

[0048] 6. Simple structure, low cost, and easy maintenance: All parts are mechanical, requiring no power supply or complex calibration, making it suitable for mass production and application.

[0049] In summary, the device designed in this utility model effectively solves the problems of "low accuracy, poor efficiency, and reliance on experience" in traditional external taper detection, reduces the misjudgment rate in the testing process, and improves the accuracy and reliability of quality control.

[0050] Obviously, those skilled in the art should understand that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the embodiments of the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An external taper measuring device, characterized in that, It includes a housing (4), a sleeve (6), and a displacement detection element (2); The outer shell (4) has an axially extending inner hole (41) inside, and the sleeve (6) is coaxially disposed in the inner hole (41) and can slide along the axial direction; The displacement detection element (2) is installed on the top of the housing (4), and its probe extends into the inner hole (41) of the housing and abuts against the upper end face of the sleeve (6). The sleeve (6) has an inner hole (62) inside, which opens at the lower end face of the sleeve (6). The lower end openings of the outer shell inner hole (41) and the inner hole (62) of the sleeve are used to simultaneously contact the outer conical surface of the workpiece being tested. The displacement detection element (2) is used to detect the axial displacement of the sleeve (6) relative to the outer shell (4).

2. The external taper measuring device according to claim 1, characterized in that, The displacement detection element (2) is a dial indicator.

3. The external taper measuring device according to claim 2, characterized in that, It also includes an elastic reset member (5), which is disposed between the upper end face of the sleeve (6) and the top of the inner hole of the outer shell (4). In the free state, the sleeve (6) is pushed down so that the lower end face of the inner hole of the outer shell (41) and the inner hole of the sleeve (62) remains flush.

4. The external taper measuring device according to claim 3, characterized in that, The elastic reset element (5) is an elastic element in a pre-compressed state, and the elastic element is a spring or an elastic body.

5. The external taper measuring device according to claim 4, characterized in that, The elastic reset component (5) is a spring, which is coaxially sleeved on the measuring rod of the displacement detection element (2). Its upper end abuts against the bottom of the inner hole (41) of the outer shell (4), and its lower end abuts against the upper end face of the sleeve (6).

6. The external taper measuring device according to claim 1, characterized in that, The sleeve (6) has an axially extending sleeve limiting groove (61) on its side wall. The outer shell (4) is threaded with a second bolt (7). The end of the second bolt (7) passes through the outer shell (4) and extends into the sleeve limiting groove (61). When the sleeve (6) slides axially, it contacts the upper or lower end face of the sleeve limiting groove (61) to limit the sliding stroke of the sleeve (6).

7. The external taper measuring device according to claim 1, characterized in that, The diameter D of the inner hole (41) of the outer shell is greater than the diameter d of the inner hole (62) of the sleeve; the roundness error of the inner hole (41) of the outer shell and the inner hole (62) of the sleeve is less than 0.008 mm, the end faces of the openings of both are not chamfered, and their respective lower end faces are perpendicular to the central axis of the device.

8. The external taper measuring device according to claim 1, characterized in that, The inner hole (62) of the sleeve is a through hole or a stepped hole, and the inner circumference of its lower end opening forms the contact part with the outer conical surface of the workpiece being measured.

9. The external taper measuring device according to claim 1 or 2, characterized in that, The displacement detection element (2) is detachably fixed to the top of the housing (4) by the first bolt (3), and the outer circle of the displacement detection element (2) and the mounting hole of the housing (4) are in clearance fit.

10. The external taper measuring device according to claim 1 or 2, characterized in that, It also includes a handle (1), which is installed on the top of the displacement detection element (2) by means of a threaded connection.

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