Hardness measuring mechanism for alloy parts

Abstract

The utility model relates to material hardness detection technical field, concretely relates to a kind of alloy piece hardness measuring mechanism, including Leeb hardness measuring instrument main part and the mounting seat of fixed installation at its end, the jack hole for installing special-shaped head is opened in the end of mounting seat away from Leeb hardness measuring instrument main part, special-shaped head is inserted in the jack hole by a plug, a limit head is elastically installed in mounting seat, the limit head can penetrate plug after insertion, a threaded head is installed in the end of limit head, when limit head penetrates plug, the threaded head can be screwed into and threadedly inserted in the threaded hole of the inside wall of jack hole, the utility model can release the locking of plug by pulling and rotating knob, to quickly pull out entire special-shaped head assembly, replacement process is simple and efficient, greatly improve work efficiency, the core of the utility model lies in that unique triple locking safeguard structure is designed, fundamentally solves the industry problem that quick-change structure is easy to loosen.

Description

Technical Field

[0001] This utility model relates to the field of material hardness testing technology, specifically to a hardness measuring mechanism for alloy parts. Background Technology

[0002] The Leeb hardness tester is a commonly used portable hardness measuring instrument. It calculates the hardness value of a material by instantaneously impacting the workpiece surface with a probe and measuring the ratio of the rebound velocity to the impact velocity. In practical applications, to meet the measurement needs of alloy workpieces with different shapes and positions (such as curved surfaces, concave surfaces, and confined spaces), it is necessary to change the impact probe with different end shapes (or special-shaped heads). For example, a frustum head is used for impacting flat surfaces, a V-groove head is used for impacting cylindrical surfaces, and an arc-shaped head is used for impacting concave surfaces.

[0003] Currently, most non-standard probes are fixed to the measuring instrument body using simple threaded connections or snap-fit ​​methods. While threaded connections are secure, they are cumbersome to replace, inefficient, and prone to wear and loosening with frequent replacements. Snap-fit ​​methods, on the other hand, allow for quick replacement, but lack sufficient rigidity, making them susceptible to slight loosening or displacement under long-term impact and vibration, leading to decreased measurement accuracy and even the risk of probe detachment. Therefore, there is an urgent need for a non-standard probe mounting structure that allows for quick disassembly and replacement while ensuring a secure and reliable connection and maintaining measurement accuracy. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an alloy part hardness measuring mechanism that enables quick replacement of irregular heads. At the same time, through a triple locking mechanism, it ensures that the irregular head is installed extremely firmly in the working state, with no risk of loosening or falling off.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a hardness measuring mechanism for alloy parts, including a Leeb hardness measuring instrument body and a mounting base fixedly installed at its end. The mounting base has an insertion hole for installing a special-shaped head at the end away from the Leeb hardness measuring instrument body. The special-shaped head is inserted into the insertion hole through a plug. A limiting head is elastically installed in the mounting base. After being inserted, the limiting head can pass through the plug. A threaded head is installed at the end of the limiting head. After the limiting head passes through the plug, the threaded head can be screwed into and threaded into a pre-set threaded hole on the inner wall of the insertion hole.

[0006] Furthermore, the end of the irregular head that contacts the workpiece has a frustum-shaped structure.

[0007] Furthermore, the end of the irregularly shaped head that contacts the workpiece has a V-groove structure.

[0008] Furthermore, the end of the irregularly shaped head that contacts the workpiece has an arc-shaped structure.

[0009] Furthermore, the inner wall of the insertion hole has a threaded hole on one side and a mounting cavity on the inner wall of the other side. A spring is fixedly installed in the mounting cavity, and the other end of the spring abuts against a rotating head, which is rotatably mounted on the end of the limiting head away from the threaded head.

[0010] Furthermore, a knob is provided on the outer wall of the mounting base, and the knob is fixedly connected to the limiting head through a connecting shaft, the connecting shaft passing through the spring.

[0011] The beneficial effects of this utility model are: Quick disassembly and replacement: The plug can be unlocked by pulling and rotating the knob, allowing the entire irregular head assembly to be pulled out quickly. The replacement process is simple and efficient, greatly improving work efficiency.

[0012] Triple protection, secure and reliable connection: The core of this utility model lies in its unique triple locking protection structure, which fundamentally solves the industry problem of easy loosening of quick-change structures. First layer of protection (mechanical limit): The limiting head is directly inserted into and passes through the plug under the action of the spring, forming the most direct mechanical limit to prevent the plug from coming out axially.

[0013] The second layer of protection (elastic preload): The spring continuously applies axial thrust to the limiting head, which not only ensures the effectiveness of the first mechanical limit, but also eliminates gaps caused by manufacturing tolerances or slight wear, keeping the connection in a continuous preload state with extremely strong impact and vibration resistance.

[0014] The third layer of protection (threaded locking): The engagement of the threaded head with the threaded hole inside the mounting base constitutes the final rigid locking. It "locks" the first two layers of protection in the working position, preventing unlocking due to any accidental external force, and is the final safety barrier to prevent loosening.

[0015] Wide adaptability: It can be equipped with various end shapes of irregular heads (such as truncated pyramids, V-grooves, arcs, etc.) to meet the precise measurement needs of alloy workpieces of different shapes such as planes, shafts, tubes, and concave surfaces, and has strong versatility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the overall first-view structure of this utility model; Figure 2 This is a schematic diagram of the mounting base and plug connection structure of this utility model; Figure 3 This is a front sectional view of the mounting base of this utility model. Figure 4 This is a schematic diagram of the elastic mounting structure of the limiting head of this utility model; Figure 5 This is a schematic diagram of the V-shaped irregular head structure of this utility model; Figure 6 This is a schematic diagram of the arc-shaped irregular head structure of this utility model.

[0018] The labels in the diagram represent: 1. Leeb hardness tester body; 11. Mounting base; 21. Irregularly shaped head; 22. Plug; 31. Limit head; 32. Threaded head; 33. Spring; 34. Rotary head; 35. Knob. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] The present invention will be further described below with reference to the embodiments.

[0021] Example 1 Reference Figure 1-4 This first embodiment of the present invention discloses a hardness measuring mechanism for alloy parts, comprising a Leeb hardness measuring instrument body 1 and a mounting base 11 installed at the end of the Leeb hardness measuring instrument body 1. The Leeb hardness measuring instrument body 1 consists of an impact device, an optical system, a sensor assembly, a signal processor, a display screen, and a power module. Its working principle is that the impactor in the impact device impacts the surface of the workpiece, the sensor detects the ratio of the rebound velocity of the impactor to the impact velocity, and the signal processor converts the ratio into a hardness value and displays it on the display screen. The mounting base 11 is specifically installed on the outer shell of the impact device at the front end of the Leeb hardness measuring instrument body 1 and is fixedly connected to the outer shell of the impact device through an M8×1.25 fine thread.

[0022] Mounting base 11 is made of high-strength aluminum alloy by CNC precision machining. The internal channel is precision reamed. The end of mounting base 11 away from the main body 1 of Leeb hardness measuring instrument has a socket hole. A plug 22 is inserted into the socket hole. The plug 22 is made of hardened chromium steel and the surface is chrome-plated for rust prevention. A special-shaped head 21 is fixedly installed at the end of plug 22 away from mounting base 11. The special-shaped head 21 is integrally sintered from tungsten carbide hard alloy. A limiting head 31 that passes through plug 22 is elastically installed inside mounting base 11. The limiting head 31 is made of 40Cr alloy steel and heat treated. A threaded head 32 that is threaded into the inner wall of the socket hole is installed at the end of the limiting head 31. The threaded head 32 is made of high-strength stainless steel. The end of the irregular head 21 that contacts the workpiece has a frustum-shaped structure with an angle of 60±2° between the inclined surface and the bottom surface. A threaded hole is provided on the inner wall of one side of the insertion hole to facilitate the threaded insertion of the threaded head 32. The threaded hole is an M5×0.8 fine thread hole. An installation cavity is provided on the inner wall of the other side of the insertion hole. A spring 33 is fixedly installed in the installation cavity. The spring 33 is a compression spring made of 65Mn material with a spring coefficient of 8N / mm. A rotating head 34 is installed on the other end of the spring 33. The rotating head 34 is made of copper-based powder metallurgy oil-impregnated bearing material. The rotating head 34 is rotatably installed on the side of the limiting head 31 away from the threaded head 32. A knob 35 is provided on the outer wall of the mounting base 11. The knob 35 is injection molded from ABS engineering plastic and has anti-slip particles on its surface. A connecting shaft with a through spring 33 and fixedly connected to the limit head 31 is fixedly connected to the center of one side of the knob 35. The connecting shaft is made of 304 stainless steel, has a diameter of 3mm, and is connected to the limit head 31 by interference fit.

[0023] The plug 22 and the non-standard head 21 are fixedly connected by silver brazing, and the brazing strength is not less than 300MPa; a spring positioning boss is provided at the bottom of the mounting cavity, and one end of the spring 33 is sleeved on the positioning boss; the fit clearance between the limiting head 31 and the plug 22 is 0.02-0.05mm; the fit clearance between the knob 35 and the outer wall of the mounting base 11 is 0.5mm, which facilitates manual rotation operation; the fit length between the threaded head 32 and the threaded hole is not less than 4mm to ensure the thread connection strength.

[0024] Example 2 Reference Figure 5 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that this embodiment describes a hardness measuring mechanism suitable for measuring cylindrical or spherical alloy workpieces.

[0025] This embodiment has the same basic structure as Embodiment 1, including the Leeb hardness measuring instrument body 1, mounting base 11, plug 22, limit head 31, threaded head 32, spring 33 and knob 35. The core difference is that the end of the irregular head 21 that contacts the workpiece is specifically designed as a V-groove structure.

[0026] The V-groove structure is precisely calculated and machined, and its groove angle matches the outer diameter of the workpiece to be measured, such as a shaft, bar, or ball. When measurement is required, the operator first uses the knob 35, the limiting head 31, and the threaded head 32 to firmly install the irregular head 21 with the V-groove end onto the mounting base 11. The installation process and the triple protection mechanism are exactly the same as in Embodiment 1.

[0027] In actual measurement, the operator can directly clamp the V-groove at the front end of the shaped head 21 onto the outer circular surface of the alloy shaft workpiece. The two inclined surfaces of the V-groove form a stable line contact with the outer circle of the workpiece. This not only effectively prevents the probe from slipping laterally during impact and ensures that the impact force acts perpendicularly on the workpiece surface, thus guaranteeing the accuracy of the measurement results, but is also particularly suitable for rapid and accurate in-situ hardness testing of curved workpieces such as pipes and shafts.

[0028] The remaining structure is the same as that in Example 1.

[0029] Example 3 Reference Figure 6 This is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that this embodiment describes a hardness measuring mechanism suitable for measuring concave curved alloy workpieces.

[0030] This embodiment has the same basic structure as Embodiment 1, including the Leeb hardness measuring instrument body 1, mounting base 11, plug 22, limiting head 31, threaded head 32, spring 33, and knob 35. The key difference is that the end of the irregular head 21 that contacts the workpiece is specifically designed as an arc-shaped structure.

[0031] The arch height and radius of curvature of this arc-shaped structure are specially designed to fit well with the inner ring of a bearing, the inner wall of a sleeve, or other concave alloy workpiece surfaces. When measurement is required, the operator can quickly and secure the irregularly shaped head 21 with its arc-shaped end to the mounting base 11 using the quick-change structure.

[0032] During measurement, the arc-shaped surface at the end of the irregular-shaped head 21 can fully wrap around the concave surface of the workpiece, maximizing the contact area at the impact point and effectively avoiding measurement errors caused by stress concentration at point contact or head wobbling. This design perfectly solves the industry problem that traditional flat-head probes cannot effectively detect inner arc surfaces, greatly expanding the application range of Leeb hardness testers.

[0033] The remaining structure is the same as that in Example 1.

[0034] Working process of alloy part hardness measuring mechanism Installation process: The first step is for the operator to select a suitable profiled head 21 based on the surface shape of the alloy workpiece to be measured. For example, when measuring a plane, a profiled head 21 with a frustum-shaped end is selected; when measuring shaft parts, a profiled head 21 with a V-groove structure at the end is selected; and when measuring a concave surface, a profiled head 21 with an arc-shaped end is selected.

[0035] The second step is to align the plug 22 at the rear of the selected irregular head 21 and insert it into the socket at the end of the mounting base 11.

[0036] Third, push the irregular head 21 towards the mounting base 11, and the plug 22 will then penetrate into the socket. The end of the plug 22 will contact and press the guide slope of the limiting head 31. This pressing force will overcome the elastic force of the spring 33 and push the entire limiting head 31 into the mounting cavity. At this time, the spring 33 is compressed.

[0037] Fourthly, once the plug 22 is fully inserted, the through hole on its side wall will be precisely aligned with the axis of the limiting head 31. At this point, as the squeezing force from the plug 22 disappears, the compressed spring 33 immediately releases its stored elastic potential energy, pushing the rotating head 34 and subsequently causing the limiting head 31 to spring back at high speed. The rod of the limiting head 31 precisely inserts into and passes through the through hole on the plug 22. This completes the first layer of mechanical limiting protection, effectively preventing the plug 22 from axially dislodging. Simultaneously, the preload of the spring 33 continues to act on the limiting head 31, forming a second layer of elastic preload protection, eliminating any possible gaps and ensuring the rigidity of the connection.

[0038] Fifth, after completing the above steps, the operator rotates the knob 35 mounted on the outside of the mounting base 11 clockwise with their finger. The knob 35 drives the limiting head 31 to rotate synchronously via the connecting shaft. Since the threaded head 32 at the end of the limiting head 31 is now aligned with the threaded hole on the inner wall of the insertion hole, the rotation causes the threaded head 32 to screw into and secure itself in the threaded hole. This completes the third layer of threaded locking protection, finally locking the entire connection structure and completely preventing accidental loosening that may occur under impact and vibration.

[0039] At this point, the irregular head 21 is installed, and the entire measuring mechanism is in working order.

[0040] Disassembly process: First, when it is necessary to replace the non-standard head 21, the operator first rotates the knob 35 counterclockwise with their finger. The knob 35 drives the limit head 31 to rotate through the connecting shaft, so that the threaded head 32 at its end is completely unscrewed from the threaded hole of the mounting base 11, thus releasing the third thread locking guarantee.

[0041] The second step is to pull the knob 35 outwards while keeping it rotated to the correct position. The knob 35 will then pull the limiting head 31 out of the through hole of its plug 22 via the connecting shaft, thus releasing the first layer of mechanical limiting protection.

[0042] Third, once the limiting head 31 is disengaged from the plug 22, the entire irregular head 21 assembly is no longer constrained. The operator can then easily pull the plug 22 out of the socket of the mounting base 11, thereby completing the disassembly of the irregular head 21 for replacement with other types of irregular heads 21.

[0043] The mechanism, through the limiting head 31, spring 33 and threaded head 32, forms a reliable triple-protection quick-change structure, realizing the core function of both quick replacement and secure installation of the irregular head 21.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hardness measuring mechanism for alloy parts, comprising a Leeb hardness measuring instrument body (1) and a mounting base (11) installed at the end of the Leeb hardness measuring instrument body (1), characterized in that, The mounting base (11) has an insertion hole at the end away from the main body (1) of the Leeb hardness measuring instrument. A plug (22) is inserted into the insertion hole. A special-shaped head (21) is fixedly installed at the end of the plug (22) away from the mounting base (11). A limiting head (31) that passes through the plug (22) is elastically installed in the mounting base (11). A threaded head (32) that is threaded into the inner wall of the insertion hole is installed at the end of the limiting head (31).

2. The alloy part hardness measuring mechanism according to claim 1, characterized in that, The end of the irregular head (21) that contacts the workpiece has a frustum-shaped structure.

3. The alloy part hardness measuring mechanism according to claim 1, characterized in that, The end of the irregular head (21) that contacts the workpiece has a V-groove structure.

4. The alloy part hardness measuring mechanism according to claim 1, characterized in that, The end of the irregular head (21) that contacts the workpiece has an arc-shaped structure.

5. The alloy part hardness measuring mechanism according to claim 1, characterized in that, The inner wall of one side of the insertion hole is provided with a threaded hole for easy threading of the threaded head (32). The inner wall of the other side of the insertion hole is provided with an installation cavity. A spring (33) is fixedly installed in the installation cavity. A rotating head (34) is installed at the other end of the spring (33). The rotating head (34) is rotatably installed on the side of the limiting head (31) away from the threaded head (32).

6. The alloy part hardness measuring mechanism according to claim 5, characterized in that, A knob (35) is provided on the outer wall of the mounting base (11). A through spring (33) is fixedly connected to the center of one side of the knob (35) and a connecting shaft is fixedly connected to the limiting head (31).

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