Tensile testing machine lower jaw with protective cover plate
By installing a removable protective cover plate in the lower jaw of the tensile testing machine, the problem of debris entering the clamping part and hydraulic system gaps when the specimen breaks is solved, which improves the testing accuracy and device stability and extends the service life.
Patent Information
- Application Number
- CN202423143412.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-19
AI Technical Summary
When a specimen breaks, debris from an existing hydraulic tensile testing machine can easily fall into the gaps between the clamping part and the hydraulic system, affecting the testing accuracy and the stability of the device, and potentially causing wear and damage to the hydraulic system.
M removable protective covers are installed in the jaws of the tensile testing machine, where M is a positive even number. The front end of the protective cover is aligned with the clamping part, and the rear end covers the gap between the clamping part and the drive part. It is fixed with screws and is made of steel plate or rubber/engineering plastic. It is designed to be higher in the front and lower in the back to facilitate the sliding of debris.
It effectively prevents debris from entering the lower jaws, improves testing accuracy and device stability, extends service life, reduces maintenance workload, and has a simple structure and low cost.
Smart Images
Figure CN223883317U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to mechanical equipment protection device technical field, especially, relate to a stretch testing machine lower jaw with protective cover plate. BACKGROUND
[0002] The stretch testing machine is a kind of special equipment for testing the mechanical properties of materials, wherein the hydraulic stretch testing machine is widely applied to the tensile, compression, bending and other mechanical property tests of various materials due to its larger loading capacity and stable performance.The clamping device of the hydraulic stretch testing machine is the key component for realizing sample fixation and loading, and its performance directly affects the accuracy and reliability of test.
[0003] At present, the clamping device of the hydraulic stretch testing machine usually includes a driving part and a clamping part, and the hydraulic driving part is provided with a cylinder system for driving the clamping part to move. When the current stretch testing machine is tested, the sample will be broken when reaching its ultimate strength with the continuous increase of tensile load. A large amount of debris will be generated when the sample is broken, and the debris will be splashed around due to the impact force when breaking. Most of the debris will fall on the clamping part due to gravity, and will fall into the gap between the driving part and the clamping part and the inside of the lower jaw during the working process of the stretch testing machine.
[0004] It is found in actual use that the debris generated when the sample is broken will fall into the gap between the clamping parts, and the debris generated when the sample is broken will fall into the lower jaw, which will affect the surface quality of the clamping surface of the jaw, reduce the friction between the clamping surface and the sample, and cause the sample to slip easily during clamping, thereby affecting the test accuracy. The debris falling into the gap between the driving part and the clamping part will cause the wear of contact surface and reduce the fitting accuracy of the moving pair, and also can affect the power transmission between the driving part and the clamping part, thereby causing the damage of the hydraulic system of the driving part and affecting the stability of the movement of the clamping device.
[0005] Therefore, there is an urgent need for a lower jaw of stretch testing machine with protective cover plate, which can effectively avoid the debris generated when the sample is broken from falling into the gap between the clamping parts and the clamping part and the hydraulic system. UTILITY MODEL CONTENTS
[0006] The utility model aims at providing a lower jaw of stretch testing machine with protective cover plate to solve the technical problem of how to effectively avoid the debris generated when the sample is broken from falling into the gap between the clamping parts and the clamping part and the hydraulic system.
[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:
[0008] A lower jaw of stretch testing machine with protective cover plate, comprising:
[0009] A lower jaw body comprises a clamping part for clamping a test sample and a driving part for driving the clamping part to move, and the driving part is symmetrically arranged on the left and right sides of the clamping part.
[0010] M pieces of protective cover plates are detachably fixed on the upper surface of the lower jaw body through fixing assemblies, and the side edges of the protective cover plates are bent downward; wherein:
[0011] M is a positive even number, the front end of the protective cover plate is arranged in alignment with the clamping surface of the clamping part, and the rear end of the protective cover plate extends to cover the gap between the clamping part and the driving part; the front end of the protective cover plate is the highest, and the rear end is the lowest.
[0012] Preferably, the fixing assembly comprises a screw and a threaded hole arranged on the upper surface of the lower jaw body, and the screw is threadedly connected with the threaded hole through the protective cover plate; the reliable fixation and convenient disassembly of the protective cover plate are ensured, and daily use and maintenance are facilitated.
[0013] Preferably, two groups of fixing assemblies are arranged on each of the protective cover plates; the installation stability of the protective cover plate is improved through double-point fixation, and deformation or loosening is prevented.
[0014] Preferably, the protective cover plate is made of a steel plate, and the surface of the protective cover plate is subjected to rust-proof treatment; the steel plate has sufficient strength and rigidity, can withstand the impact of debris, the rust-proof treatment prolongs the service life of the protective cover plate, and improves the durability.
[0015] Preferably, the protective cover plate is made of rubber or engineering plastic; has certain toughness, can buffer the impact force of debris, and is light in weight, facilitating installation and disassembly.
[0016] Preferably, M = 2, the structure design is simplified, and an optimal cost-effective solution is provided.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] The utility model provides a tensile testing machine lower jaw with a protective cover plate, by setting up protective cover plate and fixed structure, effectively solved the technical problem that the debris produced when the test sample breaks falls into the lower jaw, ensured the normal use of the testing machine lower jaw.
[0019] Specifically, by setting M detachable protective cover plates on the lower jaw body, wherein M is a positive even number, the all-around protection of the lower jaw area is realized; by bending the two side edges of the protective cover plate downward, the strength of the protective cover plate is enhanced, and the protection effect is improved; by aligning the front end of the protective cover plate with the clamping surface of the clamping part, and extending the rear end to cover the gap between the clamping part and the driving part, the integrity of the protection is ensured; the inclined design of the highest front end and the lowest rear end facilitates the timely sliding of debris and sundries, and avoids accumulation; the reliable fixation and convenient disassembly of the protective cover plate are realized through the fixing assembly design of the screw and the threaded hole; the deformation and loosening of the protective cover plate are effectively prevented by setting two groups of fixing assemblies on each protective cover plate; the strength and service life of the device are ensured by using different materials such as steel plate, rubber or engineering plastic, and the rust-proof treatment of the surface of the protective cover plate; the flexibility of the device is improved by the split two-piece protective cover plate design.
[0020] The tensile testing machine lower jaw of the utility model not only significantly improves the safety and reliability of the tensile testing process, prolongs the service life of the lower jaw, reduces the maintenance workload, but also has simple structure, low manufacturing cost, convenient installation and high practical value. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is the front view of the preferred embodiment of the utility model;
[0022] Figure 2 It is the plan view of the preferred embodiment of the utility model. Figure 1
[0023] In the figure: 1, clamping part; 2, driving part; 3, protective cover plate; 4, fixing assembly. DETAILED DESCRIPTION
[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and all other embodiments obtained by the person skilled in the art on the premise of no creative labor belong to the protection scope of the utility model based on the embodiments in the utility model.
[0025] As shown in Figure 1 and Figure 2 :
[0026] A tensile testing machine lower jaw with a protective cover plate comprises:
[0027] The lower jaw body includes a clamping part 1 for clamping a sample and a driving part 2 for driving the clamping part 1 to move, and the driving part 2 is symmetrically arranged on the left and right sides of the clamping part 1; the clamping part 1 is used for clamping a sample, and the surface thereof has a specific friction coefficient, so that the sample can be firmly clamped during the stretching process and the sample is prevented from slipping off. The driving part 2 is arranged on the left and right sides of the clamping part 1, and the symmetric arrangement can ensure uniform transmission of driving force, avoid deviation of the clamping part 1 during movement, and improve test accuracy.
[0028] The core of the embodiment is that M protective cover plates 3 are arranged, and M is a positive even number; in specific implementation, preferably, M=2, that is, two protective cover plates 3 are adopted. This configuration can ensure necessary protection effect and avoid excessively complex structure, and is an optimal scheme considering protection effect and economy.
[0029] The protective cover plate 3 is detachably fixed to the upper surface of the lower jaw body through a fixing assembly 4, and the two side edges of the protective cover plate 3 are bent downward; the front end of the protective cover plate 3 is arranged in alignment with the clamping surface of the clamping part 1, and the rear end of the protective cover plate 3 extends to cover the gap between the clamping part 1 and the driving part 2; in this way, the most dangerous area when the sample is broken can be completely covered. The protective cover plate 3 is designed to be inclined with the front end being the highest and the rear end being the lowest, so that the debris generated by breaking naturally slides down under the action of gravity, and accumulation on the protective cover plate 3 is avoided.
[0030] The fixing assembly 4 includes a screw and a threaded hole arranged on the upper surface of the lower jaw body, and the screw is threadedly connected with the threaded hole through the protective cover plate 3; each protective cover plate 3 is provided with two groups of fixing assemblies 4; the threaded connection has good anti-loosening performance and is convenient to assemble and disassemble. From the perspective of mechanics, double-point fixing can effectively prevent the protective cover plate 3 from being twisted and deformed, and provide more stable support force.
[0031] The protective cover plate 3 is made of a steel plate, and the surface of the protective cover plate 3 is subjected to rust-proof treatment; or the protective cover plate 3 is made of rubber or engineering plastic; the protective cover plate 3 has certain toughness, can buffer the impact force of debris, and is light in weight, so that it is convenient to install and disassemble.
[0032] Regarding the material of the protective cover plate 3, two schemes are provided in the embodiment: one is to adopt a steel plate subjected to rust-proof treatment; the steel material itself has high strength and high rigidity, and can withstand a large impact force, and the rust-proof treatment provides corrosion protection from the chemical aspect; the other is to adopt rubber or engineering plastic; such materials have a certain elastic modulus, can absorb impact energy through elastic deformation, and are light in weight, so that it is convenient for an operator to install and maintain.
[0033] Working principle:
[0034] Before the tensile test, first install two protective cover plates 3 on the upper surface of the lower jaw body. Each protective cover plate 3 is firmly fixed on the upper surface of the lower jaw body by the fixing bolts on both sides, forming a stable split protective structure. Because the protective cover plate 3 is designed as a left and right split and is reasonably arranged, the operator can directly put the sample into the jaw for clamping without disassembling the protective cover plate 3 when installing the sample, which will not affect the normal operation process of the testing machine; if maintenance is required, the protective cover plate 3 can also be quickly removed by disassembling the screws. The design of the two sets of fixing assemblies 4 makes the disassembly and assembly process more stable, forming a stable mechanical support structure, avoiding the deformation of the protective cover plate 3 caused by single-point stress, and better dispersing and bearing the impact force;
[0035] During the tensile test, the sample is placed in the clamping part 1 of the lower jaw body, and the protective cover plate 3 is bent downward on both sides, forming a three-dimensional protective barrier in space; as the tensile load increases, the stress inside the sample gradually accumulates. When the stress reaches the ultimate strength of the material, the sample will instantaneously break. During the breaking process, the elastic energy stored in the material is released instantaneously, generating a large amount of kinetic energy, resulting in a large amount of debris at the breaking point and flying in all directions. These debris will exhibit different trajectories under the combined action of gravity and impact force generated during breaking.
[0036] The two protective cover plates 3 now jointly play a protective role. First, since the front end of the protective cover plate 3 is aligned with the clamping surface of the clamping part 1, the rear end of the protective cover plate 3 extends to cover the gap between the clamping part 1 and the driving part 2; providing sufficient shielding for the lateral spatter of debris. Second, the front end of the protective cover plate 3 is the highest and the rear end is the lowest. The bending of the protective cover plate 3 not only enhances the structural strength, but also forms a guide channel in space, utilizing the effect of gravity to make the debris falling on the protective cover plate 3 naturally slide to both sides, avoiding accumulation on the protective cover plate 3.
[0037] When the protective cover plate 3 is made of steel plate, it has sufficient strength and rigidity to effectively withstand the impact force generated by the impact of debris; when made of rubber or engineering plastic, the toughness characteristics of the material can absorb the impact energy of the debris to some extent, reducing the possibility of debris rebound. The anti-rust treated surface ensures that the protective cover plate 3 will not affect its protective effect due to corrosion during long-term use.
[0038] After the test is completed, the operator can conveniently clean the debris on the surface of the protective cover plate 3, and since the debris is blocked outside the wedge surface, the cleaning difficulty is greatly reduced.
[0039] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A tensile testing machine lower jaw with a protective cover, comprising a lower jaw body, the lower jaw body comprising a clamping part (1) for clamping a sample and a driving part (2) for driving the clamping part (1) to move, the driving part (2) being symmetrically arranged on the left and right sides of the clamping part (1); characterized in that, Also include: M block protective cover plate (3), the protective cover plate (3) is detachably fixed on the upper surface of the lower jaw body through a fixing assembly (4), the two side edges of the protective cover plate (3) are bent downward; wherein: M is a positive even number, the front end of the protective cover plate (3) is arranged in alignment with the clamping surface of the clamping part (1), and the rear end of the protective cover plate (3) extends to cover the gap between the clamping part (1) and the driving part (2); the front end of the protective cover plate (3) is the highest, and the rear end is the lowest.
2. The guarded lower jaw of a tensile testing machine with a guard cover plate according to claim 1, characterized in that The fixing assembly (4) comprises a screw and a threaded hole arranged on the upper surface of the lower jaw body, and the screw is threadedly connected with the threaded hole through the protective cover plate (3).
3. The guarded lower jaw of a tensile testing machine with a protective cover plate of claim 1 wherein, Two groups of fixing assemblies (4) are arranged on each protective cover plate (3).
4. The guarded gap of a tensile testing machine according to claim 1, wherein, The protective cover plate (3) is made of steel plate, and the surface of the protective cover plate (3) is subjected to rust-proof treatment.
5. The guarded gap of a tensile testing machine according to claim 1 wherein, The protective cover plate (3) is made of rubber or engineering plastic.
6. The guarded gap of a tensile testing machine according to claim 1 wherein, M＝2。