Dart falling impact test device

Abstract

The utility model relates to the technical field of film testing, and discloses a dart-falling impact test device, which comprises a support frame, a dart-falling test platform and a dart-falling test platform, the clamping assembly is arranged at the bottom of the supporting frame, and the clamping assembly is used for clamping a to-be-tested sample; the holding mechanism is connected to the supporting frame in a sleeving manner, is arranged above the clamping assembly and is used for holding or releasing the dart head; and the limiting assembly is arranged between the supporting frame and the sucking and holding mechanism, and the limiting assembly is used for limiting the sucking and holding mechanism to the position over the clamping assembly. The holding mechanism is just located right above the clamping assembly through the limiting structure, so that the dart head is aligned with the to-be-tested sample for impact test after freely falling, adjustment errors caused by human intervention are eliminated, operation is convenient and fast, the test accuracy is improved, and the reliability of test results is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane testing, in particular to a falling dart impact testing device. Background Art

[0002] In the plastic film industry, material toughness and impact resistance are important indicators in material performance evaluation. Dart testing is commonly used in the industry to conduct characterization tests, subjecting film products to impact tests using a free-falling dart at a given height.

[0003] However, the applicant has found that the traditional falling dart tester has at least the following deficiencies:

[0004] During product development and testing, the impact resistance of films and sheets with different formulations varies, requiring continuous exploration. Centering is required for each test. However, relying on vision and experience can lead to deviations, which can affect test results. Utility Model Content

[0005] In view of this, the present invention provides a falling dart impact test device to solve or improve the problem in the related art that centering deviation exists when performing a falling dart impact test, which affects the test results.

[0006] In a first aspect, the present invention provides a falling dart impact test device, comprising:

[0007] Support frame;

[0008] A clamping assembly is provided at the bottom of the support frame, and is used to clamp the sample to be tested;

[0009] A holding mechanism is sleeved on the support frame and is arranged above the clamping assembly, and is used to hold or release the dart head;

[0010] A limiting component is provided between the support frame and the suction mechanism, and the limiting component is used to limit the suction mechanism to be directly above the clamping component.

[0011] In an optional embodiment, the limiting assembly includes a corresponding limiting groove and a limiting member, one of the support frame and the suction mechanism is provided with the limiting groove, and the other is provided with the limiting member, and the limiting member is clamped in the limiting groove to limit the suction mechanism to be directly above the clamping assembly.

[0012] In an optional embodiment, the method further includes:

[0013] An elastic member, one end of which is connected to the limiting member and the other end of which is connected to the support frame or the holding mechanism, wherein the elastic member is used to press the limiting member tightly into the limiting groove.

[0014] In an optional embodiment, there are at least two suction mechanisms, each of which is spaced apart along the height direction of the support frame, and each of which is rotatably connected to the support frame, and a limiting assembly is provided between each of the suction mechanisms and the support frame.

[0015] In an optional embodiment, the support frame is provided with a first annular groove, and the suction mechanism includes a connecting sleeve adapted to the first annular groove, the connecting sleeve is sleeved on the support frame and clamped in the first annular groove.

[0016] In an optional embodiment, the inner wall of the connecting sleeve is provided with a second annular groove adapted to the limiting member, the limiting member is placed in the second annular groove, and the other end of the elastic member is connected to the bottom of the second annular groove.

[0017] In an optional embodiment, the limiting member is a sphere, and the limiting groove is an arc-shaped groove adapted to the sphere.

[0018] In an optional embodiment, the diameter of the sphere is 4 mm to 6 mm.

[0019] In an optional embodiment, the method further includes:

[0020] A control unit is electrically connected to the holding mechanism, and is used to control the holding mechanism to hold or release the dart head.

[0021] In an optional embodiment, the support frame includes:

[0022] a base, on which the clamping assembly is disposed;

[0023] The column is arranged on the base and arranged in a vertical direction. The suction mechanism is sleeved on the column. The limiting component is arranged between the column and the suction mechanism.

[0024] The falling dart impact test device of the utility model uses a limiting structure to ensure that the holding mechanism is located just above the clamping component, so that the dart head can be aimed at the sample to be tested after free falling to perform the impact test, eliminating the adjustment error caused by human intervention, and is convenient to operate, thereby improving the accuracy of the test and ensuring the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of a falling dart impact test device according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic structural diagram of a support frame according to an embodiment of the present utility model;

[0028] Figure 3 This is a schematic structural diagram of the suction and holding mechanism of an embodiment of the utility model;

[0029] Figure 4 2 is a cross-sectional view of the suction and holding mechanism according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Support frame; 101. Base; 102. Column; 103. First annular groove; 2. Clamping assembly; 201. Annular clamping member; 3. Suction mechanism; 301. Connecting sleeve; 302. Second annular groove; 4. Limiting groove; 5. Limiting member; 6. Elastic member; 7. Control unit. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] The following combination Figures 1 to 4 , describing the falling dart impact test device of an embodiment of the present invention.

[0034] According to an embodiment of the present invention, a dart impact test device is provided, comprising a support frame 1, a clamping assembly 2, a suction mechanism 3, and a limit assembly. Specifically, Figure 1 As shown, the support frame 1 is used to support all components and play a load-bearing role. The clamping assembly 2 is set at the bottom of the support frame 1, and the clamping assembly 2 is used to clamp the sample to be tested. The clamping assembly 2 is a common device of the falling dart tester in the related art, so its specific structure is not repeated here. Specifically, Figure 2 As shown, the clamping assembly 2 can clamp the film sample to be tested by a pair of annular clamping members 201. Figure 1 For the placement of the falling dart impact test device shown in the figure, the up and down directions in the figure are the upper and lower directions, and the lower end in the figure is the bottom.

[0035] See also Figure 1 The holding mechanism 3 is sleeved onto the support frame 1 and positioned above the clamping assembly 2. It is used to hold and release the dart head. This mechanism is a common feature of dart drop testers in the related art, so its detailed structure is not detailed here. When powered on, the holding mechanism 3 uses an electromagnet to hold the dart head. When powered off, the dart head is released, allowing it to fall freely, meeting the test requirements and performing impact performance testing on the sample under test.

[0036] The limiting assembly is positioned between the support frame 1 and the holding mechanism 3. It is used to position the holding mechanism 3 directly above the clamping assembly 2, ensuring that the dart tip is aligned with the sample to be tested. This arrangement ensures that the holding mechanism 3 is positioned directly above the clamping assembly 2, allowing the dart tip to freely fall and then align with the sample to perform an impact test. This eliminates adjustment errors caused by human intervention, facilitates operation, improves test accuracy, and ensures the reliability of test results.

[0037] In some embodiments of the present invention, see Figure 2 and Figure 3 , the limiting assembly includes a matching limiting groove 4 and a limiting member 5, and the limiting member 5 is clamped in the limiting groove 4 to limit the suction mechanism 3 to be directly above the clamping assembly 2. One of the support frame 1 and the suction mechanism 3 is provided with a limiting groove 4, and the other is provided with a limiting member 5. In other words, the support frame 1 is provided with a limiting groove 4, and the suction mechanism 3 is correspondingly provided with a limiting member 5. Alternatively, the support frame 1 is provided with a limiting member 5, and the suction mechanism 3 is correspondingly provided with a limiting groove 4. Specifically, as Figure 2 As shown, the support frame 1 is provided with a limiting groove 4, as shown in FIG. Figure 3 As shown, the suction mechanism 3 is provided with a corresponding limiter 5. With this arrangement, when the suction mechanism 3 is assembled with the support frame 1, the limiter 5 is engaged in the limiter groove 4. At this time, the suction mechanism 3 is exactly above the clamping assembly 2, and the centering operation can be accurately completed without multiple adjustments.

[0038] In other embodiments, the limiting assembly includes a first magnet and a second magnet that align and attract each other, thereby limiting the holding mechanism 3 to be directly above the clamping assembly 2. One of the support frame 1 and the holding mechanism 3 is provided with the first magnet, and the other is provided with the second magnet. At least one of the first magnet and the second magnet is a magnet. The mutually attracted two magnets thereby limit the relative position of the holding mechanism 3 and the clamping assembly 2, ensuring reliable testing.

[0039] In some embodiments of the present invention, Figure 4 As shown, the dart impact test device further includes an elastic member 6, which can be, for example, a spring, and is used to press the limiting member 5 into the limiting groove 4. One end of the elastic member 6 is connected to the limiting member 5, and the other end is connected to the support frame 1 or the holding mechanism 3.

[0040] That is to say, if the holding mechanism 3 is provided with a limiting groove 4, a small hole is provided on the support frame 1, a limiting member 5 is embedded in the hole, and the limiting member 5 can be engaged with the limiting groove 4, then the elastic member 6 is placed in the hole, one end of which is connected to the limiting member 5, and the other end is connected to the bottom surface of the small hole on the support frame 1. On the contrary, see Figure 2 and Figure 3 As shown, if a limiting groove 4 is provided on the support frame 1 and a limiting member 5 is provided on the holding mechanism 3 , one end of the elastic member 6 is connected to the limiting member 5 , and the other end is connected to the holding mechanism 3 .

[0041] With such an arrangement, the elastic force of the elastic member 6 can stably press the limit member 5 in the limit groove 4, preventing the limit member 5 from accidentally detaching, ensuring that the suction mechanism 3 is reliably fixed directly above the clamping component 2, and facilitating the switching of the rotation position of the suction mechanism 3, making operation convenient.

[0042] In related art, falling dart testers typically only have a single holding mechanism. However, film samples of varying formulations have varying impact resistance, requiring the use of either long or short dart mode. Furthermore, different dart heads correspond to different test heights, requiring the holding mechanism to be moved up and down each time. This is time-consuming and labor-intensive, significantly reducing the tester's work efficiency.

[0043] Therefore, in some embodiments of the present invention, Figure 1 As shown, there are at least two holding mechanisms 3, and each holding mechanism 3 is spaced apart along the height direction of the support frame 1. Each holding mechanism 3 is rotatably connected to the support frame 1, and a limiting component is provided between each holding mechanism 3 and the support frame 1. It should be noted that, as shown in FIG. Figure 1 As for the placement position of the falling dart impact test device shown in the figure, the up and down direction in the figure is the height direction of the support frame 1.

[0044] Specifically, the present embodiment is described by taking two holding mechanisms 3 as an example. Figure 1 As shown, the two holding mechanisms 3 are spaced apart and located at different heights to meet the different test height requirements of the long dart mode and the short dart mode. With this arrangement, during the test, a holding mechanism 3 of appropriate height is selected according to different test requirements, and it is rotated until the limit member 5 is engaged with the limit groove 4, that is, the holding mechanism 3 is adjusted to be directly above the clamping assembly 2 for subsequent impact testing. The remaining holding mechanisms 3 are rotated to avoid the test position to avoid interference and affect the test operation. Therefore, there is no need to adjust the height position of the holding mechanism 3 back and forth, and different holding mechanisms 3 can be freely rotated to switch, avoiding test errors caused by inaccurate height switching by personnel, ensuring rapid switching of the two test modes, and being easy to operate, saving time and effort, reducing labor costs, and speeding up the test. In addition, lubricant can be filled between the holding mechanism 3 and the support frame 1 to reduce friction resistance and facilitate flexible and smooth free rotation.

[0045] In some embodiments of the present invention, Figure 2 As shown, the support frame 1 is provided with a first annular groove 103. Figure 3 As shown, the holding mechanism 3 includes a connecting sleeve 301, which is adapted to the first annular groove 103. The connecting sleeve 301 is sleeved on the support frame 1 and is clamped in the first annular groove 103. Figure 1 As shown, the connecting sleeve 301 is engaged in the first annular groove 103, so that the holding mechanism 3 is firmly mounted on the support frame 1. It is understandable that if there are multiple holding mechanisms 3, multiple first annular grooves 103 are correspondingly provided at different heights of the support frame 1 to achieve the installation and fixation of each holding mechanism 3 and the support frame 1.

[0046] In some embodiments of the present invention, Figure 4 As shown, the inner wall of the connecting sleeve 301 is provided with a second annular groove 302, which is adapted to fit within the stopper 5. The stopper 5 is positioned within the second annular groove 302, and the other end of the elastic member 6 is connected to the bottom of the second annular groove 302. This arrangement provides support and guidance for the stopper 5, reliably supporting it and providing a secure space for its telescopic movement, ensuring that it moves stably toward the stopper groove 4.

[0047] In some embodiments of the present invention, the stopper 5 is a sphere, and the stopper groove 4 is an arc-shaped groove adapted to the sphere. This arrangement, with a spherical design, is easy to operate and improves the flexibility of the system. The two keep their contours consistent, resulting in a tighter fit and a more stable connection.

[0048] In some embodiments of the present invention, the diameter of the sphere is 4 mm to 6 mm, and optionally, the diameter of the sphere is 5 mm. It should be noted that the diameter of the sphere includes but is not limited to the above values, and its size can be specifically determined according to actual design requirements to meet the matching requirements of the connection.

[0049] In some embodiments of the present invention, the falling dart impact test device further includes a control unit 7, such as Figure 1 As shown, the control unit 7 can be installed on the support frame 1 through the connecting column. The control unit 7 is electrically connected to the suction and holding mechanism 3, and the control unit 7 is used to control the suction and holding mechanism 3 to hold or release the dart head. It should be noted that the control unit 7 is a commonly used device in the falling dart tester in the relevant technology, so its specific structure and related electrical connection relationship are not repeated here. Specifically, press the magnetic suction button on the operation panel of the control unit 7, and the suction and holding mechanism 3 will suck the dart head; press the demagnetization button, and the suction and holding mechanism 3 will release the dart head, and the dart head will fall freely, and the sample to be tested will be hit by the dart head. Such a setting enhances the degree of automation and operating accuracy of the device, improves the efficiency and accuracy of the test, and is convenient to operate.

[0050] In some embodiments of the present invention, Figure 2 As shown, the support frame 1 comprises a base 101 and a column 102. The column 102 is arranged vertically and mounted on the base 101. The clamping assembly 2 is mounted on the base 101, the suction mechanism 3 is sleeved onto the column 102, and the limit assembly is positioned between the column 102 and the suction mechanism 3. With this arrangement, the base 101 provides an operating platform and a location for collecting dart heads, while the column 102 provides support. The interaction between the base 101 and the column 102 provides a suitable installation and operating space for the entire device, resulting in a reasonable overall layout and easy assembly.

[0051] In summary, the present invention provides a dart impact test device comprising a base 101, a column 102, a clamping assembly 2, a suction mechanism 3, a retaining groove 4, a retaining member 5, an elastic member 6, and a control unit 7. The clamping assembly 2 can clamp different film samples according to test requirements. There are at least two suction mechanisms 3, each for retaining or releasing the dart head, which can be freely switched based on test requirements, such as selecting a long dart mode or a short dart mode. The control unit 7 is used to control the suction mechanism 3 to retain or release the dart head.

[0052] Specifically, the working principle of the falling dart impact test device is as follows:

[0053] like Figure 1As shown, based on the initial dart mass, the staff will choose to use the long dart mode (i.e., the upper holding mechanism 3) or the short dart mode (i.e., the lower holding mechanism 3). The short dart mode is selected for impact-resistant films weighing less than 220g, while the long dart mode is selected for impact-resistant films weighing 220g or more. During the test, one of the holding mechanisms 3 is first rotated to align with the clamping assembly 2, and a limiter assembly is used to ensure that it is directly above the clamping assembly 2. The other holding mechanism 3 is then rotated to a 90-degree position so that it does not interfere with the free fall of the dart head. For example, if the short dart mode is initially selected, i.e., the dart head of the lower holding mechanism 3 is allowed to fall freely, and if it fails to rupture the film sample, the long dart mode (i.e., the upper holding mechanism 3) is selected. The lower holding mechanism 3 is now rotated to a 90-degree position, and the upper holding mechanism 3 is rotated to directly above the clamping assembly 2. The long dart test is then performed, with the dart head mass continuously increased, generally by 20g, until the film sample is ruptured. The test is terminated, and the final test result is the dart head mass when it does not rupture.

[0054] In Example 1, a short dart with a mass of 180g is initially selected as an example to illustrate the test process of this embodiment. When performing the falling dart, i.e., impact resistance test, the sample to be tested is fixed on the clamping assembly 2 by the existing clamp. The short dart head is placed at the bottom of the lower holding mechanism 3, and the magnetic attraction button is pressed on the operation panel of the control unit 7. The dart head is attracted, and the demagnetization button is pressed. The dart head falls freely, and the sample is not broken by the dart head. The mass is continued to be increased to 220g, and the above operation is repeated. No breaking occurs. Then a long dart is selected for testing, the lower holding mechanism 3 is rotated 90 degrees, and the upper holding mechanism 3 is rotated to the top of the clamping assembly 2. A long dart head with a mass of 250g is placed at the bottom of the upper holding mechanism 3, and the above operation is repeated. If the sample is not broken, the mass of the dart head is continued to be increased until it is broken, and the test is terminated.

[0055] In Example 2, the operating steps are basically the same as those in Example 1 above. The main difference lies in the difference in the impact resistance of the materials, and the impact resistance of the materials is just between the short dart and the long dart. At the same time, due to the difference in the uniformity of the materials, some test surfaces need to be tested with short darts, and some test surfaces need to be tested with long darts. If a traditional falling dart tester is used, it is necessary to move the suction mechanism up and down to switch back and forth, which is time-consuming and labor-intensive, and the test efficiency is low. By using the falling dart impact test device of this embodiment, the switching between the long dart and short dart modes is optimized, achieving the purpose of quickly switching the test mode, and greatly improving the work efficiency of the operator.

[0056] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A falling dart impact test device, characterized in that: include: Support frame (1); A clamping assembly (2) is arranged at the bottom of the support frame (1), and the clamping assembly (2) is used to clamp the sample to be tested; A holding mechanism (3) is sleeved on the support frame (1) and is arranged above the clamping assembly (2), and the holding mechanism (3) is used to hold or release the dart head; A limiting component is provided between the support frame (1) and the suction mechanism (3), and the limiting component is used to limit the suction mechanism (3) to be directly above the clamping component (2).

2. The falling dart impact test device according to claim 1, characterized in that: The limiting assembly comprises a matching limiting groove (4) and a limiting member (5); one of the support frame (1) and the suction mechanism (3) is provided with the limiting groove (4), and the other is provided with the limiting member (5); the limiting member (5) is engaged in the limiting groove (4) to limit the suction mechanism (3) to be directly above the clamping assembly (2).

3. The falling dart impact test device according to claim 2, characterized in that: Also includes: An elastic member (6) has one end connected to the limiting member (5) and the other end connected to the support frame (1) or the holding mechanism (3), and the elastic member (6) is used to press the limiting member (5) tightly into the limiting groove (4).

4. The falling dart impact test device according to claim 1, characterized in that: There are at least two of the suction mechanisms (3), each of which is spaced apart along the height direction of the support frame (1), and each of which is rotatably connected to the support frame (1), and a limiting assembly is provided between each of the suction mechanisms (3) and the support frame (1).

5. The falling dart impact test device according to claim 3, characterized in that: The support frame (1) is provided with a first annular groove (103), and the holding mechanism (3) comprises a connecting sleeve (301) adapted to the first annular groove (103), wherein the connecting sleeve (301) is sleeved on the support frame (1) and clamped in the first annular groove (103).

6. The falling dart impact test device according to claim 5, characterized in that: The inner wall of the connecting sleeve (301) is provided with a second annular groove (302) adapted to the limiting member (5), the limiting member (5) is placed in the second annular groove (302), and the other end of the elastic member (6) is connected to the bottom of the second annular groove (302).

7. The falling dart impact test device according to claim 2, characterized in that: The limiting member (5) is a sphere, and the limiting groove (4) is an arc-shaped groove adapted to the sphere.

8. The falling dart impact test device according to claim 7, characterized in that: The diameter of the sphere is 4 mm to 6 mm.

9. The falling dart impact test device according to claim 1, characterized in that: Also includes: A control unit (7) is electrically connected to the holding mechanism (3), and the control unit (7) is used to control the holding mechanism (3) to hold or release the dart head.

10. The falling dart impact test device according to claim 1, characterized in that: The support frame (1) comprises: A base (101), wherein the clamping assembly (2) is arranged on the base (101); The column (102) is arranged on the base (101) and is arranged in a vertical direction. The suction mechanism (3) is sleeved on the column (102). The limiting component is arranged between the column (102) and the suction mechanism (3).

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