Automatic testing device for bending strength of fine ceramic bonding interface

Abstract

The invention discloses an automatic testing device for the bending strength of a fine ceramic bonding interface. The automatic testing device for the bending strength of the fine ceramic bonding interface comprises a device body, two non-return assemblies and two groups of side clamping assemblies, the device body comprises a pressing head which is vertically arranged in a sliding mode, a pressing cutter acting on a fine ceramic bonding interface is arranged on the pressing head, and a pressure detection piece used for detecting pressure is arranged in the pressing head. According to the automatic testing device for the bending strength of the fine ceramic bonding interface, the pressing cutter of the device body accurately acts on the bonding interface, the non-return assembly limits reverse rotation of the driven shaft so as to prevent unloading springback and advanced fracture of the ceramic body, and the side clamping assembly synchronously clamps to prevent displacement of a workpiece; the problems of load misjudgment and data distortion in the existing test are effectively solved, and the accuracy of interface bending strength test data is ensured.

Description

Technical Field

[0001] This invention belongs to the field of fine ceramic bending strength testing technology, specifically, it relates to an automatic testing device for the bending strength of fine ceramic bonding interfaces. Background Technology

[0002] In 5G base station RF modules, alumina ceramic rods and aluminum nitride ceramic core supports are bonded together using low-temperature glass solder to form a signal transmission support structure that must withstand bending loads during module assembly and operation. In fine ceramic bonding interface bending strength tests, if the elastic deformation range of the bonding interface (e.g., containing a highly elastic organic adhesive) is wider than that of the ceramic substrate, the interface will exhibit greater elastic rebound upon loading, while the ceramic substrate, due to its high modulus, will only undergo small deformation. When the load increases to near the strength of the ceramic substrate itself, the ceramic substrate may fracture before the interface (rather than failing at the interface). At this point, the F-value recorded by the testing machine... max It is actually the "ceramic body fracture load", not the "interfacial fracture load" - if this F is mistakenly applied... max Substituting these values ​​into the calculation will lead to an overestimation of the interface bending strength. In some cases, the interface may not completely fracture during loading (only microcracks may appear). Upon unloading, the interface may rebound and release elastic potential energy, potentially causing a "reverse fluctuation" in the load curve (a brief increase in load during the unloading phase). If the testing machine's data acquisition frequency is insufficient (e.g., <10Hz), the "reverse load of unloading rebound" may be mistakenly taken as the F value during the loading phase. max This further exacerbates data errors. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide an automatic testing device for the bending strength of fine ceramic bonding interfaces.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this invention includes: The device body, two check valve assemblies, and two sets of side clamp assemblies; The device body includes a vertically sliding pressure head, which is equipped with a pressure knife that acts on the bonding interface of fine ceramics, and a pressure detection element for detecting pressure is provided inside the pressure head; The two check valve components are symmetrically arranged on the base and are used to position the two test connection parts of the fine ceramic respectively. Each check valve component includes a stand fixed on the device body, an arc-shaped transmission component that can be slidably arranged in the stand, a restraint component connected to one end of the arc-shaped transmission component, a driven gear that meshes with the arc-shaped transmission component, a driven shaft that passes through and fixes the driven gear and is rotatably connected to the stand, and a guide component arranged on the driven shaft to limit its reverse rotation. The side clamping assembly is mounted on the upright frame and is used to clamp fine ceramics. The side clamping assembly includes a rotating seat connected to the upright frame, a guide rod and a bidirectional transmission rod disposed in the rotating seat, two side clamping plates that are threaded to both ends of the bidirectional transmission rod and slidably engaged with the guide rod, and a transmission component for transmitting the rotation of the driven shaft to the bidirectional transmission rod.

[0005] This invention constructs an integrated testing system of "precise loading - stable positioning - reliable clamping," directly addressing the pain points of "load misjudgment and workpiece displacement" in existing tests. Loading and detection accuracy: The pressure head of the device body is vertically slidable, and the pressure knife can be accurately applied to the fine ceramic bonding interface. With the pressure detection element inside the pressure head, the load applied to the interface can be captured in real time, avoiding the distortion of detection data caused by load transmission deviation. Positioning stability: Two symmetrical anti-return components can respectively position the two test connection parts of the fine ceramic (such as the alumina ceramic round rod and the aluminum nitride ceramic core support), and combined with the guide component to limit the reverse rotation of the driven shaft, it can initially prevent the interface from springing back during unloading; Clamping adaptability: The side clamping assembly, through the cooperation of the bidirectional transmission rod and the side clamping plate, can clamp fine ceramics of different sizes, avoiding radial displacement of the workpiece during testing. This lays the structural foundation for the subsequent accurate acquisition of interface bending strength data, eliminating the need for frequent replacement of special fixtures and improving the versatility of the device.

[0006] Preferably, the arc-shaped transmission component includes an arc-shaped plate, an arc-shaped rack is fixed on the inner side of the arc-shaped plate, and the arc-shaped rack meshes with the driven gear; a track groove for the arc-shaped plate to slide is provided in the upright frame.

[0007] In this invention, by optimizing the structure of the arc-shaped transmission component, the key issues of "transmission stability and motion guidance" are addressed, providing reliable power transmission for subsequent functional implementation. Precise motion guidance: The track groove inside the frame provides a dedicated sliding path for the curved plate, ensuring that the curved plate does not deviate when it is moved under force, and avoiding the impact of misalignment of transmission components on positioning or clamping effect; No risk of slippage in transmission: The arc-shaped rack on the inner side of the arc plate meshes with the driven gear for transmission. Compared with traditional sliding transmission, the meshing structure can stably convert the linear motion of the arc plate into the rotational motion of the driven gear without slippage, providing continuous and stable power support for the unidirectional restraint function of the guide (such as ratchet).

[0008] Preferably, the restraint component includes a bonding plate fixedly connected to one end of the arc-shaped transmission component, a restraint strap disposed on one side of the bonding plate, a positioning plate slidably disposed within the bonding plate, and a threaded short rod passing through the bonding plate and rotatably connected at one end to the positioning plate; the bonding plate has an insertion opening for the restraint strap to pass through, and a handle is fixed to the end of the threaded short rod away from the positioning plate.

[0009] In this invention, the structural optimization of the restraint component primarily improves the "adaptability, firmness, and ease of operation of workpiece clamping," making it suitable for the diverse forms of fine ceramics. Wide range of sizes: By wrapping the workpiece with a binding strap and pushing the positioning plate with a threaded short rod to press the binding strap, it can be adapted to cylindrical fine ceramics (such as round rods and core supports) of different diameters without the need to customize fixtures for specific sizes. High reliability: The threaded drive of the short thread rod has a self-locking characteristic. After the positioning plate presses the restraint belt, it is not easy to loosen. It can ensure that the workpiece and the restraint are stably connected throughout the test and avoid the workpiece from falling off and causing the test to be interrupted. Simplified operation: Simply turn the handle to adjust the threaded short rod to push the positioning plate. No complicated tools are required, simplifying the clamping process, lowering the operating threshold, and improving testing efficiency.

[0010] Preferably, the guide includes a ratchet fixed on the driven shaft and a check pawl rotatably connected to the upright and capable of engaging with the ratchet teeth.

[0011] In this invention, the use of a "ratchet-anti-return pawl" guide structure is key to solving the core pain point of "interface springback causing data errors" in existing technologies. Preventing interface springback: When the fine ceramic is loaded and bent, the driven shaft rotates synchronously with the arc-shaped transmission component; when unloading, the anti-return pawl abuts against the ratchet teeth, forcibly restricting the driven shaft from rotating in the opposite direction, thereby preventing the arc-shaped plate and restraint component from resetting, and the workpiece always remains in a loaded state, avoiding interface springback and release of elastic potential energy. Ensure data accuracy: effectively prevent "reverse fluctuation load" during the unloading phase from being misjudged as the maximum load (F) during the loading phase. max This approach avoids miscalculating "ceramic body fracture load" as "interface fracture load," fundamentally reducing errors in interface bending strength calculations and improving the reliability of test results.

[0012] Preferably, the check valve assembly further includes a reset part for releasing the one-way guide member restriction. The reset part includes a reset rod rotatably connected to the upright, a guide block fixed on the check valve pawl and slidably passing through the reset rod, a sleeve fixed on one side of the check valve pawl, and a reset spring with one end connected to the sleeve and the other end rotatably connected to the driven shaft. The reset rod has a guide opening for the guide block to slide.

[0013] In this invention, a reset structure is added to address the problems of "difficulty in resetting the device after testing and low efficiency in repeated use": Conveniently removes one-way restriction: By pushing the reset rod or sleeve, the check pawl can be disengaged from the ratchet, and the reverse rotation restriction can be removed without disassembling the check assembly, thus solving the cumbersome operation of traditional devices that require disassembly and reset. Stable reset motion: The guide block slides within the guide opening of the reset rod, providing precise guidance for the reset of the stop pawl and preventing jamming; the reset spring assists the stop pawl in returning to its initial working position, ensuring that the guide component can still reliably perform its unidirectional limiting function after reset. Extend component lifespan: Avoid wear on ratchet and check pawl caused by forced disassembly, reduce component maintenance frequency, and lower device operating costs.

[0014] Preferably, the transmission component includes two toothed pulleys fixed on the driven shaft and the bidirectional transmission rod respectively, and an internal toothed belt sleeved on the two toothed pulleys; the bidirectional transmission rod is a bidirectional lead screw, and the side clamp plate has a threaded travel hole adapted to the bidirectional lead screw and a guide hole adapted to the guide rod.

[0015] In this invention, the structure of the transmission component and the bidirectional transmission rod is optimized, with the core improvement being the "clamping synchronization and transmission reliability," achieving linkage between the check valve assembly and the side clamp assembly: Precise and backlash-free transmission: The driven shaft and the bidirectional transmission rod are driven by a toothed pulley and an internal toothed belt. Compared with gear transmission, there is no toothed backlash, which can accurately transmit the rotational motion of the driven shaft to the bidirectional transmission rod and avoid transmission errors. Uniform clamping force: The bidirectional transmission rod adopts a bidirectional lead screw with opposite threads at both ends. When rotating, the two side clamping plates can move synchronously towards the middle or both sides along the guide rod to ensure uniform clamping force on the workpiece and avoid premature fracture of the ceramic body due to local stress concentration, which may be mistakenly judged as interface failure. Simplified and linked structure: The linkage between the check valve assembly and the side clamp assembly is realized (the driven shaft rotates while simultaneously driving the side clamping plate), reducing independent drive components, simplifying the device structure, and reducing the failure rate.

[0016] Preferably, the side clamp assembly further includes two auxiliary pulleys, both of which are disposed in the rotating seat and are rotatably connected to the guide rod and the bidirectional transmission rod, respectively. The auxiliary pulleys can contact the surface of the fine ceramic.

[0017] In this invention, an auxiliary pulley structure is added to address the issues of "workpiece surface protection and smooth bending motion," which is well-suited to the fragile nature of fine ceramics. Protecting the workpiece surface: The pulley contacts the fine ceramic surface, transforming the "sliding friction" of traditional clamping into "rolling friction," thus avoiding scratches on the ceramic surface during clamping or bending (damage to the fine ceramic surface will directly affect its actual strength, leading to distorted test data). To ensure smooth bending motion: When the workpiece is loaded and bent, the pulley rotates synchronously with the ceramic surface, which will not hinder the normal deformation of the workpiece, ensuring that the bending process conforms to the actual stress scenario and avoiding load detection deviation due to frictional resistance. Auxiliary limiting and anti-displacement: The auxiliary pulley can provide radial auxiliary limiting for the workpiece, further supplementing the clamping effect of the side clamping plate and preventing the workpiece from leaving the preset test position during bending.

[0018] Preferably, the pressure detection element is a pressure sensor, and the detection end of the pressure sensor extends to the contact end of the bonding interface between the pressure knife and the fine ceramic.

[0019] In this invention, the pressure detection element is explicitly defined as a pressure sensor with the detection end extending to the contact end, directly improving the "accuracy and real-time performance of load detection": Reduce load loss: The detection end of the pressure sensor extends directly to the contact end of the interface between the pressure knife and the ceramic bonding interface, avoiding the loss of pressure during the transmission process through the pressure head and pressure knife, and ensuring that the detected load value is consistent with the actual load acting on the interface. Capturing minute load changes: The detection end is close to the core of the test, enabling real-time capture of load fluctuations when micro-cracks appear at the interface, avoiding missing the true "interface fracture load (F)" due to detection lag. max This will further improve data accuracy.

[0020] Preferably, the upright frame has a reserved space for the movement of the anti-return pawl, and there are three guide blocks, all of which are fixedly connected to the anti-return pawl.

[0021] In this invention, by reserving space for the upright frame to move and by setting three guide blocks, the "stability of the guide components and the lifespan of the components" are significantly improved. Ensuring sufficient space for guide components: The space reserved inside the frame ensures that the anti-return pawl does not get stuck when it engages with or disengages from the ratchet, preventing components from jamming due to insufficient space and affecting the one-way restriction function; Balanced force and wear prevention: The three guide blocks are fixedly connected to the check pawl, which can provide balanced support for the movement of the check pawl, avoid uneven force and component tilting caused by a single guide block, reduce wear on the check pawl and ratchet, and extend the service life of both.

[0022] Preferably, the two check valve components are used to position the alumina ceramic rod and the aluminum nitride ceramic core support respectively, and the bonding interface between them is located directly below the pressure knife; the clamping surface of the side clamping plate can fit against the outer peripheral surface of the alumina ceramic rod or the aluminum nitride ceramic core support. Both auxiliary pulleys are located within the rotating seat, and the outer peripheral surfaces of the two auxiliary pulleys are at the same horizontal level as the clamping surface of the side clamping plate, ensuring that the ceramic part contacts both the auxiliary pulleys and the side clamping plate simultaneously when placed; the clamping surface of the side clamping plate is provided with a silicone buffer layer, which can fit against the outer peripheral surface of the alumina ceramic rod or the aluminum nitride ceramic core support, preventing excessive clamping force from damaging the ceramic. In this invention, two check valve components are used to position two types of ceramic parts respectively, ensuring that the bonding interface between the two is located directly below the pressure knife, thus preventing pressure from acting on the ceramic body rather than the interface, which would cause the test direction to deviate from the core. The clamping surface of the side clamping plate is in contact with the outer peripheral surface of the ceramic, increasing the contact area. This ensures that the clamping is firm and prevents local stress concentration from causing premature fracture of the ceramic body, ensuring that the detected fracture load truly reflects the interface strength rather than the strength of the ceramic body.

[0023] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides an automatic testing device for the bending strength of fine ceramic bonding interface. The guide restricts the reverse rotation of the driven shaft, and the workpiece cannot rebound after loading, thus avoiding premature fracture of the ceramic substrate due to secondary stress concentration during rebound, and ensuring that fracture occurs preferentially at the bonding interface. At the same time, the bidirectional transmission rod drives the two side clamps to clamp synchronously along the guide rod, and the clamping force is uniform without local stress concentration, further blocking the path of the ceramic body to fracture first. The pressure tool is precisely applied to the bonding interface. With the positioning of the side clamping component and the check valve component, it avoids the load position shift due to workpiece displacement. The pressure detection component inside the pressure head "captures the load acting on the interface in real time" rather than the strength of the ceramic body, thus solving the problem of "load object misalignment" from the root and avoiding overestimation of the calculated value.

[0024] (2) The present invention provides an automatic testing device for the bending strength of the bonding interface of fine ceramics. When loading, the bending of fine ceramics causes the arc-shaped transmission component to slide, thereby driving the driven gear and driven shaft to rotate. When unloading, the guide component restricts the reverse rotation of the driven shaft, so that the arc-shaped transmission component and the restraint component cannot be reset. The workpiece always remains in the loaded state and there is no release of elastic potential energy, thus completely avoiding the generation of "reverse fluctuation load". The pressure cutter precisely acts on the bonding interface, and the pressure detection component, with its "detection end extending to the contact end between the pressure cutter and the fine ceramic bonding interface," can directly and in real-time capture the interface load without load transfer loss; moreover, there is no springback interference. The pressure detection component can accurately record the maximum load (interface fracture load) during the loading phase, without mistakenly taking the reverse load of unloading springback as F. max Solving the problem of "data distortion" (3) The present invention provides an automatic testing device for the bending strength of the bonding interface of fine ceramics. The restraint can fix the end of the fine ceramics, and the side clamp is clamped to the middle synchronously through the bidirectional transmission rod. With the sliding limit of the guide rod, a dual positioning of "end fixing + middle clamping" is formed to ensure that the pressure knife always acts on the bonding interface without loading position deviation. The threaded engagement between the bidirectional transmission rod and the side clamping plate allows for adjustment of the clamping distance, and the restraint strap can also be adapted to cylindrical ceramic parts of different diameters, improving the versatility of the device while reducing positioning errors caused by clamp replacement, and further ensuring test stability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an overall schematic diagram of an automatic testing device for the bending strength of a fine ceramic bonding interface according to the present invention. Figure 2 This is a schematic diagram illustrating the explosion effect of the check valve assembly in this invention; Figure 3 This is a schematic diagram of the side clamp assembly in this invention; Figure 4 This is a schematic diagram of the restraint component in this invention; Figure 5 This is a schematic diagram of the driven shaft in this invention; Figure 6 This is a schematic diagram of the driven gear in this invention; Figure 7 This is a schematic diagram of the ratchet structure in this invention; Figure 8 This is a schematic diagram of the reset rod in this invention.

[0027] Figure label: 1. Device body; 11. Base; 12. Telescopic bar; 13. Pressure head; 14. Pressure knife; 2. Check valve assembly; 21. Stand; 22. Arc plate; 23. Arc rack; 24. Driven gear; 25. Driven shaft; 26. Fitting plate; 27. Restraint belt; 28. Positioning plate; 29. ​​Threaded short rod; 210. Handle; 211. Ratchet; 212. Check pawl; 213. Reset rod; 214. Guide block; 215. Sleeve; 216. Reset spring; 3. Side clamp assembly; 31. Rotating seat; 32. Auxiliary pulley; 33. Guide rod; 34. Two-way lead screw; 35. Side clamp plate; 36. Toothed pulley; 37. Internal toothed belt. Detailed Implementation

[0028] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0029] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0031] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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 limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0032] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] The present invention aims to introduce and explain the structural composition of an automatic testing device for the bending strength of fine ceramic bonding interfaces and the matching relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components in the automatic testing device for the bending strength of fine ceramic bonding interfaces in the present invention can be selected according to specific circumstances, and no special limitations or explanations are given here.

[0034] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0035] Example 1 Please see Figure 1 and Figure 2 This embodiment discloses an automatic testing device for fine ceramic bonding interfaces, including a device body 1.

[0036] Furthermore, the device body 1 includes a base 11, with two telescopic rods 12 fixedly connected inside the base 11. The telescopic cylinder 12 is a pneumatic cylinder. A pressure head 13 is provided on the top of the base 11. The telescopic ends of the two telescopic rods 12 are fixedly connected to the pressure head 13. A pressure knife 14 for pressing down the fine ceramic bonding interface is fixedly connected to the bottom of the pressure head 13.

[0037] It should be noted that the pressure head 13 is equipped with a pressure detection element for detecting pressure. The pressure detection element is preferably a pressure sensor, and its detection end extends to the contact end of the bonding interface between the pressure knife 14 and the fine ceramic. The pressure sensor is electrically connected to the controller of the device body 1 through a shielded data cable. The controller can collect load data in real time. When the load drops sharply beyond a preset ratio, it automatically determines that the bonding interface is broken and records the maximum load.

[0038] Please see Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8This embodiment discloses an automatic testing device for the bending strength of a fine ceramic bonding interface, including a check valve assembly 2. Two check valve assemblies 2 are used to position the connector between the same alumina ceramic rod and the aluminum nitride ceramic core support, and to position the bonding interface below the pressure knife 14.

[0039] Furthermore, the anti-return assembly 2 includes a stand 21, which is fixedly connected to the base 11. A track groove is opened through the stand 21, and an arc-shaped plate 22 is slidably connected in the track groove. One end of the arc-shaped plate 22 is connected to a restraining member for connecting with the fine ceramic. An arc-shaped rack 23 is fixedly connected in the arc-shaped plate 22. A driven gear 24 is meshed on one side of the arc-shaped rack 23. A driven shaft 25 is fixedly connected in the driven gear 24. The driven shaft 25 is rotatably connected to the stand 21. The driven shaft 25 can only rotate in the direction of downward bending of the fine ceramic. A guide member is provided on the driven shaft 25 to guide the unidirectional rotation of the driven shaft 25.

[0040] It is understandable that a track groove is provided through the upright 21, and limiting protrusions are provided at both ends of the track groove to prevent the arc plate 22 from sliding out; the arc plate 22 is slidably connected in the track groove, and the outer side wall of the arc plate 22 and the inner side wall of the track groove are in clearance fit, with a fit gap ≤0.1mm, and the arc plate 22 is provided at both ends with guide flanges that are adapted to the track groove to prevent the arc plate 22 from moving laterally.

[0041] Specifically, the restraint component includes a bonding plate 26 fixedly connected to one end of the arc-shaped plate 22. A restraint strap 27 is fixedly connected to one side of the bonding plate 26, and an insertion port for the restraint strap 27 to pass through is opened on the other side of the bonding plate 26. A positioning plate 28 is slidably connected in the insertion port. Two threaded connection holes are opened in the bonding plate 26, and a threaded short rod 29 is threadedly connected to each of the two threaded connection holes. One end of the threaded short rod 29 is rotatably connected to the positioning plate 28, and the other end of the threaded short rod 29 is fixedly connected to a handle 210. It should be noted that when connecting fine ceramics, by covering the alumina ceramic rod and aluminum nitride ceramic core support at the corresponding positions with two binding straps 27 respectively, the two bonding plates 26 support the alumina ceramic rod and the aluminum nitride ceramic core support. Then, the binding straps 27 are passed through the corresponding insertion holes. Rotating the handle 210 causes the threaded short rod 29 to rotate and pushes the positioning plate 28 down to fix the binding straps 27, thus completing the connection between the binding component and the fine ceramics. When the pressure knife 14 applies pressure to the bonding interface of the fine ceramics, the alumina ceramic rod... The aluminum nitride ceramic core support will bend, and the bonding plate 26 will be pressed against the arc plate 22, causing the arc plate 22 to move in the direction of the upright 21. When the pressure head 13 is unloaded, the interface will rebound and release elastic potential energy under normal conditions. However, due to the guide component blocking the driven shaft 25, the driven gear 24, arc rack 23 and arc plate 22 connected in sequence cannot be reset and move. This causes the binding strap 27 to tightly pull the alumina ceramic rod and the aluminum nitride ceramic core support to prevent them from rebounding, so that the alumina ceramic rod and the aluminum nitride ceramic core support remain in a loaded state.

[0042] The guide includes a ratchet 211 fixedly connected to the driven shaft 25, and a check pawl 212 connected to the ratchet 211. The check pawl 212 is rotatably connected to the stand 21. When the fine ceramic is loaded, the ratchet 211 will rotate with the driven shaft 25. When the fine ceramic is unloaded, the end of the check pawl 212 will abut against the teeth of the ratchet 211 to prevent it from rotating. Furthermore, the guide also includes a reset part, which includes a reset rod 213 rotatably connected in the upright 21. The reset rod 213 has three guide openings, and a guide block 214 is slidably connected in each guide opening. A check pawl 212 is fixedly connected to the three guide blocks 214. A sleeve 215 is fixedly connected to one side of the check pawl 212, and a reset spring 216 is fixedly connected to one side of the sleeve 215. One end of the reset spring 216 is rotatably connected to the driven shaft 25.

[0043] It is understandable that by pushing the free end of the reset rod 213, the guide block 214 is driven to slide along the guide opening of the reset rod 213, thereby pulling the check pawl 212 to rotate around the rotation point; or by directly pressing the sleeve 215, the reset spring 216, which is connected to the sleeve 215 at one end and rotatedly connected to the driven shaft 25 at the other end, is compressed. The reset spring 216 is initially in a naturally extended state, and the check pawl 212 is always in contact with the ratchet 211 under its pulling force, which can make the check pawl 212 disengage from the ratchet 211 and release the reverse rotation restriction.

[0044] Please see Figure 3 and Figure 5 This embodiment discloses an automatic testing device for the bending strength of fine ceramic bonding interfaces, including a side clamp assembly 3.

[0045] Furthermore, the side clamping assembly 3 includes a rotating seat 31 fixedly connected to the top of the upright 21. Two auxiliary pulleys 32 are connected inside the rotating seat 31. A guide rod 33 is rotatably connected inside one of the auxiliary pulleys 32 and is fixedly connected to the rotating seat 31. A bidirectional lead screw 34 is fixedly connected inside the other auxiliary pulley 32 and is rotatably connected to the rotating seat 31. Side clamping plates 35 are provided at both ends of the bidirectional lead screw 34. A threaded travel hole adapted to the bidirectional lead screw 34 is opened through the side clamping plate 35. A guide hole adapted to the guide rod 33 is opened through the side clamping plate 35. Toothed pulleys 36 are fixedly connected to both the bidirectional lead screw 34 and the driven shaft 25. An internal toothed belt 37 is provided between the two toothed pulleys 36, and the two toothed pulleys 36 are connected by transmission through the internal toothed belt 37.

[0046] Specifically, the bidirectional lead screw 34 is positioned close to the edge of the support frame 21, ensuring that the pulley 32 on the bidirectional lead screw 34 remains in contact with the fine ceramic. When the alumina ceramic rod and the aluminum nitride ceramic core support are bent under load, the pulley 32 rotates during the bending process, causing the bidirectional lead screw 34 to rotate accordingly. This causes the two side clamps 35 to move towards the corresponding positions of the alumina ceramic rod and the aluminum nitride ceramic core support, clamping and fixing them to prevent the fine ceramic from radially shifting and disengaging from the pulley 32 during operation of the check valve assembly 2. During the rotation of the bidirectional lead screw 34, the driven shaft 25 also rotates due to the transmission between the two toothed pulleys 36. However, when the bidirectional lead screw 34 stops rotating, the end of the check pawl 212 will abut against the teeth of the ratchet 211 to prevent it from rotating, thus maintaining the clamping state of the two side clamps 35.

[0047] In this embodiment, the specific implementation steps for the automatic testing of the bending strength of the fine ceramic bonding interface are as follows: S1. By covering the alumina ceramic rod and aluminum nitride ceramic core support at the corresponding positions with two binding straps 27 respectively, the two bonding plates 26 support the alumina ceramic rod and the aluminum nitride ceramic core. Then, the binding straps 27 are passed through the corresponding insertion holes. The handle 210 is rotated to make the threaded short rod 29 rotate and push the positioning plate 28 down to fix the binding straps 27. At this time, the connection between the binding component and the fine ceramic is completed.

[0048] S2. Restart the telescopic lever 12 so that its telescopic end drives the pressure head 13 to press down, causing the pressure knife 14 to bend the bonding interface between the alumina ceramic rod and the aluminum nitride ceramic core support. The bonding plate 26 is forced to compress the arc plate 22, causing the arc plate 22 to move in the direction of the upright 21. When the pressure head 13 is unloaded, the interface rebounds and releases elastic potential energy under normal conditions. However, because the guide component prevents the driven shaft 25, the driven gear 24, the arc rack 23 and the arc plate 22 connected in sequence cannot reset and move. This causes the binding strap 27 to tightly pull the alumina ceramic rod and the aluminum nitride ceramic core support to prevent them from rebounding. This keeps the alumina ceramic rod and the aluminum nitride ceramic core support in a loaded state, preventing them from contacting the detection end of the pressure sensor again when they rebound, thereby improving the accuracy of the bending strength test.

[0049] S3. When the alumina ceramic rod and the aluminum nitride ceramic core support are bent under load, the pulley 32 will rotate during the bending process, causing the bidirectional lead screw 34 to rotate accordingly. This causes the two side clamps 35 to move towards the corresponding positions of the alumina ceramic rod and the aluminum nitride ceramic core support, using the two side clamps 35 to clamp and fix the alumina ceramic rod and the aluminum nitride ceramic core support, preventing the fine ceramic from radially moving away from the pulley 32 during operation of the check valve assembly 2. During the rotation of the bidirectional lead screw 34, the driven shaft 25 will also rotate due to the transmission between the two toothed pulleys 36. However, when the bidirectional lead screw 34 stops rotating, the end of the check pawl 212 will abut against the teeth of the ratchet 211 to prevent it from rotating, allowing the two side clamps 35 to maintain the clamping state. Even if the alumina ceramic rod and the aluminum nitride ceramic core support break, the clamping of the two side clamps 35 can prevent the alumina ceramic rod and the aluminum nitride ceramic core support from flying off.

[0050] S4. After the bending strength test is completed, the sleeve 215 is forced to move the check pawl 212 to the outside of the ratchet 211. At this time, the return spring 216 is deformed by the force. The upright 21 has reserved space for the movement of the check pawl 212. When the connection between the check pawl 212 and the ratchet 211 is broken, the elastic force of the alumina ceramic rod and the aluminum nitride ceramic core support after bending is used to reset the position of the bonding plate 26. When the alumina ceramic rod and the aluminum nitride ceramic core support break, it can be manually reset.

[0051] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic testing device for the bending strength of a fine ceramic bonding interface, characterized in that, It includes the device body (1), two check valve components (2) and two sets of side clamp components (3); The device body (1) includes a vertically sliding pressure head (13), on which a pressure knife (14) is provided to act on the fine ceramic bonding interface, and a pressure detection element for detecting pressure is provided inside the pressure head (13); The two check valve components (2) are symmetrically arranged on the base (11) for positioning the two test connection parts of the fine ceramic respectively. Each check valve component (2) includes a stand (21) fixed on the device body (1), an arc-shaped transmission component that can be slidably arranged in the stand (21), a restraint component connected to one end of the arc-shaped transmission component, a driven gear (24) meshing with the arc-shaped transmission component, a driven shaft (25) that passes through and fixes the driven gear (24) and is rotatably connected to the stand (21), and a guide component arranged on the driven shaft (25) to limit its reverse rotation. The side clamp assembly (3) is mounted on the stand (21) and is used to clamp fine ceramics. The side clamp assembly (3) includes a rotating seat (31) connected to the stand (21), a guide rod (33) and a bidirectional transmission rod disposed in the rotating seat (31), two side clamps (35) respectively threaded to both ends of the bidirectional transmission rod and slidingly engaged with the guide rod (33), and a transmission component for transmitting the rotation of the driven shaft (25) to the bidirectional transmission rod.

2. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The arc-shaped transmission component includes an arc-shaped plate (22), an arc-shaped rack (23) is fixed on the inner side of the arc-shaped plate (22), and the arc-shaped rack (23) meshes with the driven gear (24); the upright frame (21) has a track groove for the arc-shaped plate (22) to slide.

3. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The restraint component includes a bonding plate (26) fixedly connected to one end of the arc-shaped transmission component, a restraint strap (27) disposed on one side of the bonding plate (26), a positioning plate (28) slidably disposed within the bonding plate (26), and a threaded short rod (29) passing through the bonding plate (26) and rotatably connected at one end to the positioning plate (28); the bonding plate (26) has an insertion opening for the restraint strap (27) to pass through, and a handle (210) is fixed at the end of the threaded short rod (29) away from the positioning plate (28).

4. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The guide includes a ratchet (211) fixed on the driven shaft (25) and a backlash pawl (212) rotatably connected to the stand (21) and capable of engaging with the teeth of the ratchet (211).

5. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 4, characterized in that: The check valve assembly (2) also includes a reset part for releasing the one-way guide member restriction. The reset part includes a reset rod (213) rotatably connected to the stand (21), a guide block (214) fixed on the check pawl (212) and slidably passing through the reset rod (213), a sleeve (215) fixed on one side of the check pawl (212), and a reset spring (216) with one end connected to the sleeve (215) and the other end rotatably connected to the driven shaft (25). The reset rod (213) has a guide opening for the guide block (214) to slide.

6. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The transmission component includes two toothed pulleys (36) fixed on the driven shaft (25) and the bidirectional transmission rod respectively, and an internal toothed belt (37) sleeved on the two toothed pulleys (36); the bidirectional transmission rod is a bidirectional lead screw (34), and the side clamp (35) has a threaded travel hole adapted to the bidirectional lead screw (34) and a guide hole adapted to the guide rod (33).

7. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The side clamp assembly (3) also includes two auxiliary pulleys (32), both of which are located in the rotating seat (31) and are rotatably connected to the guide rod (33) and the bidirectional transmission rod, respectively. The auxiliary pulleys (32) can contact the surface of the fine ceramic.

8. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The pressure detection component is a pressure sensor, and the detection end of the pressure sensor extends to the contact end of the bonding interface between the pressure knife (14) and the fine ceramic.

9. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The upright frame (21) has a reserved space for the movement of the anti-return pawl (212), and the guide block (214) has three parts, all of which are fixedly connected to the anti-return pawl (212).

10. The automatic testing device for the bending strength of a fine ceramic bonding interface according to claim 1, characterized in that: The two check valve components (2) are used to position the alumina ceramic rod and the aluminum nitride ceramic core support respectively, and the bonding interface of the two is located directly below the pressure knife (14); the clamping surface of the side clamp (35) can fit against the outer peripheral surface of the alumina ceramic rod or the aluminum nitride ceramic core support.

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