Viscoelastic creep aging testing machine

Abstract

The utility model belongs to the field of creep testing of viscoelastic materials, and particularly relates to a viscoelastic creep aging testing machine which comprises a frame body, a workpiece fixing end I and a workpiece fixing end II, the workpiece fixing end I and the workpiece fixing end II are oppositely arranged at the two ends of the frame body, and the workpiece fixing end II is movably arranged on the frame body by pulling a driving device. The workpiece fixing end I and the workpiece fixing end II are driven to be far away from each other, the workpiece fixing end I comprises a baffle and a free chuck, the baffle is arranged on the frame body, a limiting groove is formed in the baffle in the connecting line direction of the workpiece fixing end I and the workpiece fixing end II, and a clamping groove is formed in the free chuck. According to the utility model, the baffle plate and the free clamping head are combined, so that the size and the structure of the free clamping head can be conveniently replaced to adapt to the sizes and the structures of different tested samples, the clamping effect of the free clamping head is stable and reliable in the test process, and meanwhile, the clamping efficiency of the free clamping head is greatly improved. Tension can be further applied through the free chuck.

Description

Technical Field

[0001] This utility model belongs to the field of creep testing of viscoelastic materials, specifically relating to a viscoelastic creep aging test machine. Background Technology

[0002] Creep refers to the phenomenon where the strain of a solid material increases over time under constant stress. While plastic deformation typically occurs after the stress exceeds the elastic limit, creep can occur even when the stress is below the elastic limit, provided the stress duration is sufficiently long. Viscoelastic materials such as rubber, asphalt, and propellants undergo creep during use and storage, particularly in solid rocket motors. The solid propellant's own weight can cause creep, affecting the internal properties of the propellant, degrading its performance, and even potentially leading to safety accidents. Therefore, to ensure the storage reliability of solid rocket motors, it is essential to study their creep characteristics.

[0003] However, the test sample is usually strip-shaped with mating blocks at both ends for engaging with the fixtures of the aging test machine. But in special fields, such as solid rocket propellants, the material composition of the solid material in the test sample is diverse, and the size and structure of different types of test samples may vary considerably. This leads to the need for aging test machines to be equipped with fixtures of various sizes and structures. However, in current creep aging test machines, the fixtures need to be fixedly installed to the machine body. Therefore, when testing different types of test samples, it is necessary to repeatedly assemble and disassemble the fixtures, increasing the initial setup time and affecting the test efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a viscoelastic creep aging test machine that can quickly and efficiently switch between different clamps.

[0005] The present invention includes a frame, a pulling drive device, and workpiece fixing ends I and II, which are respectively arranged at opposite ends of the frame. Workpiece fixing ends I and / or II are moved on the frame by the pulling drive device, which drives workpiece fixing ends I and II to move away from each other. Workpiece fixing end I includes a baffle and a free clamp. The baffle is fixed or slidably arranged on the frame, and a limit groove is provided on the baffle along the line connecting workpiece fixing ends I and II. The free clamp is provided with a locking groove. When the free clamp is working, it abuts against the side of the baffle away from workpiece fixing end II, and the locking groove communicates with the limit groove.

[0006] Furthermore, the workpiece fixing end II includes a tension sensor and a fixing clamp connected in sequence, and the pulling drive device is connected to the other end of the tension sensor.

[0007] Furthermore, multiple limiting grooves are arranged in a rectangular array on the baffle, and multiple free clamps, tension sensors, and fixed clamps are correspondingly arranged.

[0008] Furthermore, the pulling drive device includes a guide rod II, a movable plate, and a linear moving component. The guide rod II is fixedly mounted on the frame, the movable plate is slidably mounted on the guide rod II, one end of the linear moving component is fixed to the frame, and the other end is connected to the movable plate. Multiple tension sensors are fixedly mounted on the movable plate.

[0009] Furthermore, a driving force sensor is provided between the moving plate and the linear moving component.

[0010] Furthermore, the linear moving component is a screw jack.

[0011] This invention also includes a pull rope displacement sensor mounted on the movable plate.

[0012] Furthermore, the workpiece fixing end I is located below the frame, the workpiece fixing end II is located above the frame, and a weight connecting rod is provided on the side of the free clamp away from the opening of the locking groove.

[0013] Furthermore, the frame includes a base, a top seat, and two guide rods I connecting the base and the top seat, and the baffle is fixedly or slidably mounted on the two guide rods I.

[0014] Furthermore, the workpiece fixing end II has the same structure as the workpiece fixing end I and is arranged symmetrically.

[0015] The beneficial effects of this utility model are as follows: the workpiece fixing end I used to fix one end of the test sample consists of a baffle and a free clamp. The baffle can be fixed to the frame or connected to the output end of the pull drive device. The free clamp is a completely independent component when not in use, with no connection to the test mechanism. When fixing the test sample, the mating block of the test sample extends out of the baffle end through the limiting groove, and the locking groove of the free clamp engages with the mating block of the test sample. At this time, when the pull drive device pulls the baffle away from the workpiece fixing end II or pulls the workpiece fixing end II away from the baffle, the free clamp is subjected to tension and abuts against the baffle, automatically clamping the mating block of the test sample and self-locking. Thus, the free clamp is used in both testing and non-testing applications. During the test, no fixed connection to the testing machine is required, and the device can maintain a stable and reliable fixation during the test. When it is necessary to switch between different sizes and structures of free clamps, the replacement is extremely convenient and quick. In addition, the free shape of the free clamps also facilitates the application of further tensile force during creep aging tests. For example, when conducting creep aging tests on viscoelastic materials such as solid rocket propellants, a tensile force away from the baffle can be applied to the free clamps to simulate the tensile capacity of solid rocket propellants after the elastic limit, and to test the effect of the self-weight of viscoelastic materials. When the free clamps are set at the bottom, the weight of the free clamps will be converted into a tensile force on the sample being tested. Therefore, by increasing the weight of the free clamps, a further tensile force can be applied to simulate the effect of the self-weight of large test materials. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of the present invention under test conditions;

[0017] Appendix Figure 2 This is a front view of the present invention under test conditions;

[0018] Appendix Figure 3 This is a schematic diagram of the structure of this utility model in its idle state.

[0019] In the diagram, 1-frame; 11-base; 12-top seat; 13-guide rod I; 2-workpiece fixing end I; 21-baffle; 211-limiting groove; 22-free clamp; 221-locking groove; 222-weight connecting rod; 3-workpiece fixing end II; 31-tension sensor; 32-fixed clamp; 33-limiting plate; 4-pull drive device; 41-guide rod II; 42-moving plate; 43-linear moving part; 44-drive force sensor; 45-pull rope displacement sensor; 5-sample under test. Detailed Implementation

[0020] 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.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] As attached Figure 1-3As shown, this utility model includes a frame 1, a pulling drive device 4, and workpiece fixing ends I2 and II3 respectively disposed at opposite ends of the frame 1. The workpiece fixing ends I2 and / or II3 are moved on the frame 1 by the pulling drive device 4. The pulling drive device 4 drives the workpiece fixing ends I2 and II3 to move away from each other. The workpiece fixing end I2 includes a baffle 21 and a free clamp 22. The baffle 21 is fixedly or slidably disposed on the frame 1, and a limiting groove 211 is provided on the baffle 21 along the line connecting the workpiece fixing ends I2 and II3. The free clamp 22 is provided with a locking groove 221. When the free clamp 22 is working, it abuts against the side of the baffle 21 away from the workpiece fixing end II3, and the locking groove 221 communicates with the limiting groove 211.

[0026] This invention relates to a workpiece fixing end I2 for fixing one end of a test sample 5, which consists of a baffle 21 and a free clamp 22. The baffle 21 can be fixed to the frame 5 or connected to the output end of the pull drive device 4. The free clamp 22 is a completely independent component when not in use, having no connection to the test mechanism. When fixing the test sample 5, the mating block of the test sample 5 extends out of the baffle 21 through the limiting groove 211, and the engaging groove 221 of the free clamp 22 engages with the mating block of the test sample 5. At this time, when the pull drive device 4 pulls the baffle 21 away from the workpiece fixing end II3 or pulls the workpiece fixing end II3 away from the baffle 21, the free clamp 22 is pulled and abuts against the baffle 21, automatically clamping the mating block of the test sample 5 and self-locking. Thus, the free clamp 22... 2. During both testing and non-testing processes, there is no need for a fixed connection with the testing machine, and it can maintain a stable and reliable fixation during the testing process. When it is necessary to switch between different sizes and structures of the free clamp 22, the replacement is extremely convenient and quick. In addition, the free shape of the free clamp 22 also facilitates the application of further tensile force during creep aging tests. For example, when conducting creep aging tests on viscoelastic materials such as solid rocket propellants, a tensile force away from the baffle 21 can be applied to the free clamp 22 to simulate the tensile capacity of solid rocket propellants after the elastic limit, and to test the effect of the self-weight of viscoelastic materials. When the free clamp 22 is set at the bottom, the weight of the free clamp 22 will be converted into a tensile force on the sample 5 under test. Therefore, by increasing the weight of the free clamp 22, a further tensile force can be applied to simulate the effect of the self-weight of large test materials.

[0027] This utility model has three implementation methods, including:

[0028] In the first embodiment, the workpiece fixed end I2 is fixedly connected to the frame 1 as a fixed end, and the workpiece fixed end II3 is connected to the pulling drive device 4 as a pulling end. At this time, the baffle 21 of the workpiece fixed end I2 is fixedly connected to the frame 1.

[0029] In the second embodiment, the workpiece fixing end II3 is fixedly connected to the frame 1 as the fixing end, and the workpiece fixing end I2 is connected to the pulling drive device 4 as the pulling end. At this time, the baffle 21 of the workpiece fixing end I2 is slidably connected to the frame 1. The pulling drive device 4 is connected to the baffle 21 to pull the baffle 21 and drive the free clamp 22 to move.

[0030] In Example 3, both workpiece fixed end I2 and workpiece fixed end II3 are slidably connected to the frame 1 as pulling ends. Two sets of pulling drive devices 4 are set up to pull workpiece fixed end I2 and workpiece fixed end II3 away from each other. Among them, the baffle 21 of workpiece fixed end I2 is slidably connected to the frame 1. The pulling drive device 4 is connected to the baffle 21 to pull the baffle 21 and drive the free clamp 22 to move.

[0031] In Embodiment 1, the workpiece fixing end II 3 includes a tension sensor 31 and a fixing clamp 32 connected in sequence. The pulling drive device 4 is connected to the other end of the tension sensor 31, thereby facilitating the monitoring of the tension applied to the sample 5 being tested.

[0032] In this embodiment, preferably, multiple limiting grooves 211 are arranged in a rectangular array on the baffle 21, and multiple free clamps 22, tension sensors 31, and fixed clamps 32 are correspondingly arranged, allowing multiple samples 5 of the same or different types to be tested simultaneously for creep aging tests, thus improving the test volume and efficiency. Furthermore, when conducting creep aging tests on multiple samples 5 of the same type simultaneously, after the pulling drive device 4 applies the same tension and stretches the samples 5 by the same distance, due to the free nature of the multiple free clamps 22, the tension of the multiple samples 5 can be fine-tuned by applying a tension away from the baffle 21 to the multiple free clamps 22, allowing for creep aging tests with different tensions. When the free clamps 22 are positioned at the bottom, this can be achieved simply by increasing the weight of the free clamps 22, for example, by adding weights; the fine-tuning process is convenient and quick. Additionally, during the testing of multiple samples 5, the creep deformation of one sample 5 does not affect the testing of other samples 5, ensuring that the test results are independent and do not interfere with each other.

[0033] In this embodiment, the pulling drive device 4 includes a guide rod II 41, a moving plate 42, and a linear moving component 43. Preferably, two guide rods II 41 are fixedly mounted on the frame 1. The moving plate 42 is slidably mounted on the guide rods II 41. One end of the linear moving component 43 is fixed to the frame 1, and the other end is connected to the moving plate 42. Multiple tension sensors 31 are fixedly mounted on the moving plate 42. This allows one linear moving component 43 to simultaneously drive multiple tension sensors 31 and the fixed clamp 32 to move and elongate the sample 5 being tested via the moving plate 42, eliminating the need for a separate linear moving component 43 for each group and simplifying the structure. In this embodiment, the workpiece fixing end II 3 also includes a limiting plate 33 connected to the frame 1. The limiting plate 33 connects to the guide rods II 41, improving the stability of the guide rods II 41 and the limiting effect on the sample 5 being tested.

[0034] In this embodiment, a driving force sensor 44 is provided between the moving plate 42 and the linear moving member 43 to detect the total driving force.

[0035] In one embodiment, the linear moving part 43 is a screw jack, preferably a handwheel type screw jack, that is, the handle turns the worm gear reducer to control the precision screw to drive the moving plate 42 to move precisely. Due to the large speed ratio, it can easily and slowly stretch multiple test samples 5 and keep them in the stretched state. This embodiment does not require electronic drive equipment. After stretching, the test sample 5 can be kept in the stretched state for a long time through the self-locking function, which improves the stability of long-term testing.

[0036] In this embodiment, a rope displacement sensor 45 is also provided on the movable plate 42 to monitor the elongation of the sample 5 under test.

[0037] In this embodiment, the workpiece fixing end I2 is located below the frame 1, and the workpiece fixing end II3 is located above the frame 1. A weight connecting rod 222 is provided on the side of the free clamp 22 away from the opening direction of the engaging groove 221. In this embodiment, fine-tuning of the tension can be achieved by adding different weights to the weight connecting rod 222, making the operation extremely convenient and quick. Furthermore, as... Figure 3 As shown, in this embodiment, when no creep aging test is performed, the free clamp 22 can be placed above the baffle 21, and the weight connecting rod 222 can be housed in the limiting groove 211 to place the free clamp 22 and prevent the free clamp 22 from being lost.

[0038] In one embodiment, the frame 1 includes a base 11, a top seat 12, and two guide rods I13 connecting the base 11 and the top seat 12. The baffle 21 is fixedly or slidably mounted on the two guide rods I13. With this arrangement, the overall structure of the frame 1 is simple, and it is convenient to fix or slide the baffle 21, while also facilitating the installation of the pull drive device 4.

[0039] In Embodiment 1, Embodiment 2, or Embodiment 3, the workpiece fixing end II3 and the workpiece fixing end I2 have the same structure and are symmetrically arranged. In this case, the baffle connecting the workpiece fixing end II3 and / or the workpiece fixing end I2 can be pulled by the drive device 4. In this embodiment, the clamps of the workpiece fixing end II3 and the workpiece fixing end I2 are both free clamps, which makes it easier to equip different sizes and models of test samples 5.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A viscoelastic creep aging testing machine, characterized in that: The invention comprises a frame (1), a pulling drive device (4), and a workpiece fixing end I (2) and a workpiece fixing end II (3) which are arranged at two ends of the frame (1) in a relative manner. The workpiece fixing end I (2) and / or the workpiece fixing end II (3) are arranged on the frame (1) by moving the pulling drive device (4). The pulling drive device (4) drives the workpiece fixing end I (2) and the workpiece fixing end II (3) to move relatively away from each other. The workpiece fixing end I (2) comprises a baffle (21) and a free A chuck (22), the baffle (21) is fixedly or slidably arranged on the frame (1), and a limiting groove (211) is arranged on the baffle (21) along the connecting line direction of the workpiece fixed end I (2) and the workpiece fixed end II (3), and a clamping groove (221) is arranged on the free chuck (22), and when the free chuck (22) is in operation, it abuts against the side of the baffle (21) away from the workpiece fixed end II (3), and the clamping groove (221) is connected with the limiting groove (211).

2. The viscoelastic creep aging testing machine according to claim 1, characterized in that: The workpiece fixing end II (3) comprises a tension sensor (31) and a fixing clamp (32) which are connected in sequence, and the pulling drive device (4) is connected to the other end of the tension sensor (31).

3. The viscoelastic creep aging testing machine according to claim 2, characterized in that: A plurality of the limiting grooves (211) are provided on the baffle (21), and a plurality of the free clamps (22), the tension sensors (31) and the fixed clamps (32) are provided correspondingly.

4. The viscoelastic creep aging testing machine according to claim 3, characterized in that: The pulling drive device (4) comprises a guide rod II (41), a movable plate (42) and a linear movable member (43); the guide rod II (41) is fixedly arranged on the frame (1); the movable plate (42) is slidably arranged on the guide rod II (41); one end of the linear movable member (43) is fixed on the frame (1) and the other end is connected to the movable plate (42); and a plurality of tension sensors (31) are fixedly arranged on the movable plate (42).

5. The viscoelastic creep aging testing machine according to claim 4, characterized in that: A driving force sensor (44) is provided between the moving plate (42) and the linear moving member (43).

6. The viscoelastic creep aging testing machine according to claim 4, characterized in that: The linear moving part (43) is a screw screw elevator.

7. The viscoelastic creep aging testing machine according to claim 4, characterized in that: It also includes a pull rope displacement sensor (45) arranged on the moving plate (42).

8. The viscoelastic creep aging testing machine according to any one of claims 1 to 7, characterized in that: The workpiece fixing end I (2) is arranged below the frame (1), the workpiece fixing end II (3) is arranged above the frame (1), and a weight connecting rod (222) is arranged on the side of the free chuck (22) away from the opening direction of the engaging groove (221).

9. The viscoelastic creep aging testing machine according to any one of claims 1 to 7, characterized in that: The frame (1) comprises a base (11), a top seat (12) and two guide rods I (13) connecting the base (11) and the top seat (12), and the baffle (21) is fixedly or slidably arranged on the two guide rods I (13).

10. The viscoelastic creep aging testing machine according to claim 1, characterized in that: The workpiece fixing end II (3) and the workpiece fixing end I (2) have the same structure and are symmetrically arranged.

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