Quick grip metal tensile testing device

Abstract

The utility model relates to medical metal testing equipment technical field discloses fast clamping metal tension testing arrangement, including at least one by annular block constitutes clamping unit, the annular cavity is established in the annular block inside, the centring clamping mechanism is arranged in the annular cavity, and the similar side of two annular blocks is provided with dismounting mechanism, the centring clamping mechanism includes the inner tooth ring fixed in the annular cavity coaxially, a plurality of along the circumferential direction and the inner tooth ring meshing transmission gear, wherein one transmission gear is transmission connection with a drive assembly, a plurality of respectively with the transmission gear coaxial fixed first bevel gear, in the utility model, through the inner tooth ring synchronous all transmission gear, then via bevel gear system and screw rod will synchronous rotation convert into all clamping plate synchronous radial linear motion, thereby can automatically, accurately position and clamp sample in geometric center.

Description

Technical Field

[0001] This utility model relates to the field of medical metal testing equipment technology, and in particular to a rapid clamping metal tension testing device. Background Technology

[0002] Medical metallic materials, such as medical-grade titanium alloys, cobalt-chromium alloys, and implant-grade stainless steel, are core strategic materials for manufacturing human implants (e.g., artificial joints, bone fixation plates, dental implants) and precision surgical instruments. The precision and reliability of their mechanical properties directly affect the safety and effectiveness of medical products, and are fundamental prerequisites for ensuring patient health and treatment outcomes. Therefore, tensile property testing of medical metallic materials has far more stringent requirements in terms of accuracy, reliability, and repeatability than for ordinary industrial materials.

[0003] However, current tensile testing of medical metals often employs manual or simple mechanical clamps. The alignment process heavily relies on operator experience and visual inspection, making it prone to eccentric loading. For medical metals, which have "zero tolerance" for deviations, this eccentricity leads to inaccurate test data, potentially incorrectly classifying a batch of high-value, qualified materials as unqualified, or, more dangerously, releasing unqualified products, causing significant quality and safety hazards and economic losses. Furthermore, traditional manual clamps cannot precisely control the initial clamping force; excessive force can easily cause indentations, scratches, or microcracks on the sample surface, creating stress concentration points. This not only directly leads to breakage at the clamping point, rendering the data invalid, but more importantly, given the high value of medical metals, any sample scrapped due to improper clamping will drastically increase testing costs. Therefore, a rapid clamping metal tension testing device is proposed to address these issues. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a rapid clamping metal tension testing device, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A rapid clamping metal tension testing device includes at least one clamping unit composed of annular blocks. An annular cavity is provided inside the annular block, and a centering clamping mechanism is provided inside the annular cavity. A disassembly and assembly mechanism is provided on the adjacent side of the two annular blocks. The centering clamping mechanism includes an internal gear ring coaxially fixed within the annular cavity; a plurality of transmission gears evenly distributed along the circumferential direction and meshing with the internal gear ring, one of which is connected to a drive assembly; a plurality of first bevel gears coaxially fixed with the transmission gears; a plurality of second bevel gears evenly distributed along the circumferential direction and meshing with the first bevel gears, the second bevel gears being rotatably connected to the annular block about their radial axes; a plurality of threaded rods threadedly engaged with the second bevel gears, the threaded rods reciprocating radially along the annular block; and a plurality of transmission rods fixedly connected to the inner ends of the threaded rods and clamping plates fixedly connected to the inner ends of the transmission rods. As a further description of the above technical solution: The drive assembly includes a mounting plate fixed to the outside of the annular block, on which a drive motor is fixedly mounted, and the output shaft of the drive motor is connected to one of the transmission gears. As a further description of the above technical solution: The internal gear ring meshes with all the transmission gears to synchronize the rotation of all the transmission gears; each of the first bevel gears meshes with its corresponding second bevel gear. As a further description of the above technical solution: The outer walls of the plurality of threaded rods are slidably connected to the inner wall of the annular block, and the outer walls of the plurality of transmission rods are slidably connected to the inner wall of the annular block; As a further description of the above technical solution: The device includes two clamping units, an upper one and a lower one, which are respectively mounted on the upper and lower clamps of the tension testing machine via connecting seats, and one of the connecting seats is fixed to a base. As a further description of the above technical solution: The disassembly and assembly mechanism includes multiple connectors, and each of the multiple clamping plates has a pre-embedded hole on the side near the center of the annular block. The outer wall of the connector is rotatably connected to the inner wall of the pre-embedded hole. As a further description of the above technical solution: One of the connecting parts is a connecting pin, one end of which is threaded to the inner end of the threaded rod; As a further description of the above technical solution: The end face of the annular block is detachably fitted with a cover via multiple connectors, and the inner side of the cover abuts against the end of the connector.

[0006] This utility model has the following beneficial effects: 1. In this utility model, all transmission gears are synchronized by an internal gear ring, and then the synchronous rotation is converted into the synchronous radial linear motion of all clamping plates through a bevel gear system and a threaded rod. This enables the sample to be automatically and accurately positioned and clamped at the geometric center, solving the problem of misalignment caused by human error in traditional manual clamping. It ensures the coaxiality of the sample under force and avoids interference of eccentric loads on test data. At the same time, stepper or servo motors are used as the drive source, which allows the clamping speed and initial clamping force to be precisely controlled by a program. This realizes the automation and standardization of the clamping process and improves the efficiency of the test.

[0007] 2. In this utility model, the detachable cover design allows the complex internal transmission system to be fully exposed, greatly facilitating daily inspection, maintenance, and component replacement. This reduces the long-term use and maintenance costs of the equipment and allows users to easily increase or decrease the number of clamps (e.g., from four-point clamping to two-point clamping) according to the sample shape (such as rods or plates). This enables a single device to adapt to the testing needs of metal materials of different specifications and shapes, expanding the applicability of the device and avoiding the cost of purchasing multiple sets of special fixtures for samples of different shapes. This brings significant economic benefits and convenience to users. Attached Figure Description

[0008] Figure 1 This is a perspective view of the rapid clamping metal tension testing device proposed in this utility model; Figure 2 This is a schematic diagram of the structure of the annular block of the rapid clamping metal tension testing device proposed in this utility model; Figure 3 This is a schematic diagram of the structure of the cover of the rapid clamping metal tension testing device proposed in this utility model; Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0009] Legend: 1. Ring block; 2. Connecting seat; 3. Base; 4. Tension testing machine; 5. Drive motor; 6. Transmission gear; 7. Internal gear ring; 8. First bevel gear; 9. Second bevel gear; 10. Threaded rod; 11. Transmission rod; 12. Clamping plate; 13. Connector 1; 14. Cover; 15. Connector 2. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] Reference Figure 2 , Figure 3 and Figure 4 An embodiment of this utility model provides a rapid clamping metal tension testing device, including at least one clamping unit composed of annular blocks 1. An annular cavity is opened inside the annular block 1, and a centering clamping mechanism is provided inside the annular cavity. A disassembly and assembly mechanism is provided on the adjacent side of the two annular blocks 1. The centering clamping mechanism includes an internal gear ring 7 coaxially fixed in the annular cavity; multiple transmission gears 6 evenly distributed along the circumference and meshing with the internal gear ring 7, one of which is connected to a drive assembly. The drive assembly includes a mounting plate fixed to the outside of the annular block 1, on which a drive motor 5 is fixedly mounted. The drive motor 5 is a stepper motor or a servo motor, which can be programmed by an external controller to achieve precise control of the clamping speed and initial clamping force, so as to adapt to metal materials of different hardness and brittleness and prevent the sample surface from being crushed due to excessive clamping force. The output shaft of the drive motor 5 is connected to one of the transmission gears 6. Multiple first bevel gears 8 are coaxially fixed with the transmission gear 6; multiple second bevel gears 9 are evenly distributed along the circumferential direction and mesh with the first bevel gears 8 respectively. The second bevel gears 9 are rotatably connected to the annular block 1 about their radial axis. The function of this bevel gear set is to efficiently convert the rotational motion along the circumferential direction of the annular block 1 into a radial rotational motion perpendicular to the rotational direction; multiple threaded rods 10 are threadedly engaged with the second bevel gears 9 respectively. The threaded rods 10 reciprocate radially along the annular block 1; and multiple transmission rods 11 are fixedly connected to the inner ends of the threaded rods 10 and clamping plates 12 are fixedly connected to the inner ends of the transmission rods 11 respectively. The internal gear ring 7 meshes with all the transmission gears 6 to synchronize their rotation; each first bevel gear 8 meshes with its corresponding second bevel gear 9 to convert the circumferential rotation of the transmission gears 6 into the radial linear motion of the threaded rods 10. The outer walls of the multiple threaded rods 10 are slidably connected to the inner wall of the annular block 1, and the outer walls of the multiple transmission rods 11 are slidably connected to the inner wall of the annular block 1. The outer walls of the threaded rods 10, the outer walls of the transmission rods 11, and the inner wall of the annular block 1 are provided with guide ribs or guide grooves to form a sliding fit.

[0012] Reference Figure 1 and Figure 3 The device includes two clamping units, upper and lower, which are respectively installed on the upper and lower clamps of the tension testing machine 4 via connecting seats 2. One of the connecting seats 2 is fixed to a base 3. The upper clamp is usually a movable clamp, and the lower clamp is usually fixed. The disassembly and assembly mechanism includes multiple connectors 13. Each of the multiple clamping plates 12 has a pre-embedded hole on one side near the center of the annular block 1. The outer wall of the connector 13 is rotatably connected to the inner wall of the pre-embedded hole. The connector 13 is a connecting pin, one end of which is threaded to the inner end of the threaded rod 10. The end face of the annular block 1 is detachably mounted with a cover 14 through multiple connectors 2 15. The inner side of the cover 14 abuts against the end of the connector 13. When it is necessary to maintain or replace the internal gear transmission mechanism, it is only necessary to unscrew the multiple connectors 2 15 to easily remove the cover 14 from the annular block 1, making the internal transmission components clear at a glance and easy to operate. This facilitates the quick replacement of a single clamping plate 12 and its transmission components. It also allows the user to flexibly remove some clamping components according to the test requirements (for example, two of the four clamping components can be removed), thereby converting the device into a two-point clamping mode to adapt to the clamping requirements of different shaped (such as plate-shaped) samples, greatly enhancing the versatility of the device.

[0013] Working principle: When it is necessary to clamp the sample, the drive motor 5 installed outside the annular block 1 starts, and its output shaft drives one of the transmission gears 6 to rotate. Since all the transmission gears 6 are meshed with the internal gear ring 7 fixed in the annular cavity, the rotation of one transmission gear 6 will force all the other transmission gears 6 to rotate synchronously. The rotation of each transmission gear 6 is transmitted to the second bevel gear 9 meshed with it through the first bevel gear 8 fixed on the same axis, converting the rotation along the circumferential direction into the rotation along the radial axis. The second bevel gear 9 is threaded with the threaded rod 10. When the second bevel gear 9 rotates, it will drive the threaded rod 10 to produce a linear motion in the radial direction like a nut. Since the movement of all the transmission gears 6 is completely synchronized, all the clamping plates 12 connected to the threaded rod 10 will eventually clamp towards the center or loosen outwards at the same speed and displacement, so that samples of any shape can be automatically and accurately clamped at the geometric center of the test, ensuring the coaxiality of the tensile force. The cover 14 is fixed to the end face of the annular block 1 by multiple connectors 15. When maintenance, repair, or replacement of the internal transmission structure is required, the cover 14 can be easily removed by simply unscrewing the connectors 15, fully exposing the core transmission components such as the internal gear ring 7, transmission gear 6, and bevel gear set. This provides ample operating space and greatly facilitates disassembly and assembly. The structure also allows for easy adjustment of the number of clamping plates 12 to accommodate samples of different shapes. Each clamping plate 12, through connector 13, forms an independent clamping module with the corresponding threaded rod 10 and other transmission components. After removing the cover 14, any one or more clamping modules can be easily disassembled or installed. For example, when testing round or square bars, all clamping modules can be used to achieve the best centering and clamping effect; while when testing flat plate-shaped metal specimens, two opposing clamping modules can be easily removed, leaving only two opposing clamping plates 12 for clamping, thereby achieving stable and effective clamping of plate-shaped specimens, avoiding the stress unevenness problem that may be caused by multi-point clamping, and significantly enhancing the versatility and adaptability of the device.

[0014] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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.

Claims

1. A rapid clamping metal tension testing device, comprising at least one clamping unit composed of an annular block (1), characterized in that: The annular block (1) has an annular cavity inside, and a centering clamping mechanism is provided inside the annular cavity. A disassembly and assembly mechanism is provided on the adjacent side of the two annular blocks (1). The centering clamping mechanism includes an internal gear ring (7) coaxially fixed in the annular cavity; a plurality of transmission gears (6) evenly distributed along the circumferential direction and meshing with the internal gear ring (7), one of the transmission gears (6) being connected to a drive assembly; a plurality of first bevel gears (8) respectively coaxially fixed with the transmission gears (6); a plurality of second bevel gears (9) evenly distributed along the circumferential direction and meshing with the first bevel gears (8), the second bevel gears (9) being rotatably connected to the annular block (1) about their radial axis; a plurality of threaded rods (10) respectively threaded with the second bevel gears (9), the threaded rods (10) reciprocating along the radial direction of the annular block (1); and a plurality of transmission rods (11) respectively fixedly connected to the inner ends of the threaded rods (10) and a clamping plate (12) fixedly connected to the inner ends of the transmission rods (11).

2. The rapid clamping metal tension testing device according to claim 1, characterized in that: The drive assembly includes a mounting plate fixed to the outside of the annular block (1), on which a drive motor (5) is fixedly mounted, and the output shaft of the drive motor (5) is connected to one of the transmission gears (6).

3. The rapid clamping metal tension testing device according to claim 1, characterized in that: The internal gear ring (7) meshes with all the transmission gears (6) to synchronize the rotation of all the transmission gears (6); each of the first bevel gears (8) meshes with its corresponding second bevel gear (9).

4. The rapid clamping metal tension testing device according to claim 1, characterized in that: The outer walls of the plurality of threaded rods (10) are slidably connected to the inner wall of the annular block (1), and the outer walls of the plurality of transmission rods (11) are slidably connected to the inner wall of the annular block (1).

5. The rapid clamping metal tension testing device according to claim 1, characterized in that: The device includes two clamping units, upper and lower, which are respectively installed on the upper and lower clamps of the tension testing machine (4) via connecting seats (2), and one of the connecting seats (2) is fixed on a base (3).

6. The rapid clamping metal tension testing device according to claim 1, characterized in that: The disassembly and assembly mechanism includes multiple connectors (13), and each of the multiple clamping plates (12) has a pre-embedded hole on one side near the center of the annular block (1). The outer wall of the connector (13) is rotatably connected to the inner wall of the pre-embedded hole.

7. The rapid clamping metal tension testing device according to claim 6, characterized in that: The connector (13) is a connecting pin, one end of which is threaded to the inner end of the threaded rod (10).

8. The rapid clamping metal tension testing device according to claim 6, characterized in that: The end face of the annular block (1) is detachably fitted with a cover (14) via multiple connectors (15), and the inner side of the cover (14) abuts against the end of the connector (13).

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