Foam core shear detection fixture

Abstract

The utility model discloses a kind of foam core material shear detection clamps, it is related to clamp technical field, including clamp main part, still include: pivot, one end with the clamping piece fixed connection of the clamp main body, and it is set up with the clamping piece one-to-one correspondence;Mounting hole, be set up in the positioning block of the clamp main body, its inner end with the pivot end away from the clamping piece is connected by axial force component rotation, its outer end with the pivot end close to the clamping piece is connected by radial force component rotation.The utility model aims at solving the defects that existing foam core material shear detection clamp single person mounts and clamps need to "use one heart three", inconvenient operation, two people cooperate and increase artificial cost;By rotatable clamping piece, realize that single person easily completes mounting and clamping to sample, reduce operation complexity and artificial cost.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a clamping device for testing the shear strength of foam core materials. Background Technology

[0002] Due to its lightweight, thermal insulation, and impact resistance, foam core materials are widely used in sandwich structures in aerospace, shipbuilding, and building curtain walls. Their shear strength is a crucial indicator for evaluating their performance. Currently, the shear strength testing of foam core materials mainly relies on universal testing machines. Patent CN111896352A, which discloses "Specimen, Preparation Method, and Testing Method for Testing the Shear Properties of Foam Core Materials," is a commonly used technical solution in the industry. Its core logic is as follows: the two ends of a foam core material specimen (usually a sandwich structure with a panel) are fixed in the upper and lower clamps of a universal testing machine, and shear force is applied through the relative movement of the clamps.

[0003] Publication numbers CN103454146A, CN103454148A, and CN103454147A all disclose clamps that can be installed on universal testing machines, which have the advantages of convenient operation and quick clamping or releasing of specimens. However, there is still a drawback of inconvenient clamping operation: if operated by a single person, the operation process is as follows: the operator adjusts the upper clamp (or lower clamp) of the universal testing machine by lifting the lever to open its jaws, inserts the first end of the specimen into the jaws, and then the jaws close to clamp it; after the first end is fixed, the universal testing machine is operated to move the lower clamp (or upper clamp) towards the end of the specimen. During the movement, the jaws must be kept open. After the end of the specimen enters the jaws to a certain depth, the movement is stopped, and the jaws close to clamp it. Therefore, it is evident that during the end-clamping process, operators need to multitask: operating the lifting rod to keep the jaws open, operating the universal testing machine to move the clamps, and observing the depth to which the sample end enters the jaws. This is mentally taxing, difficult, inconvenient, and easily leads to fatigue. If two people are involved, an additional salary is required, increasing labor costs; furthermore, if the two people miscoordinate, it can easily damage the sample, waste materials, and increase testing costs.

[0004] Therefore, it is necessary to develop a shear strength testing fixture for foam core materials to address the aforementioned defects. Utility Model Content

[0005] The purpose of this utility model is to provide a foam core material shear strength testing fixture, which aims to solve the shortcomings of existing foam core material shear strength testing fixtures, which require a single person to "do three things at once" for clamping, making operation inconvenient, and require two people to cooperate, which increases labor costs; through rotatable clamping plates and clamping logic, a single person can easily complete the clamping of the sample, reducing the complexity of operation and labor costs.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a shear strength testing fixture for foam core materials, comprising a fixture body and further comprising: A rotating shaft, one end of which is fixedly connected to the clamping piece of the fixture body, and is arranged in a one-to-one correspondence with the clamping piece; The mounting hole is formed on the positioning block of the fixture body. Its inner end is rotatably connected to the end of the rotating shaft away from the clamping piece through an axial force-bearing component, and its outer end is rotatably connected to the end of the rotating shaft near the clamping piece through a radial force-bearing component.

[0007] Optionally, the rotating shaft includes a first shaft segment and a second shaft segment coaxially fixedly connected; the axial force-bearing component is disposed between the inner end of the mounting hole and the first shaft segment; the radial force-bearing component is disposed between the outer end of the mounting hole and the second shaft segment; the end of the second shaft segment away from the first shaft segment protrudes from the mounting hole and is fixedly connected to the clamping piece.

[0008] Optionally, the axial force-bearing component includes a thrust bearing disposed at the inner end of the mounting hole, the first shaft segment having an interference fit with the inner wall of the thrust bearing's ring, the diameter of the second shaft segment being larger than the diameter of the first shaft segment, and the end face of the second shaft segment away from the clamping piece abutting against the thrust bearing's ring.

[0009] Optionally, the radial force-bearing component includes a radial bearing disposed at the outer end of the mounting hole, and the second shaft segment is interference-fitted with the inner ring of the radial bearing.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows: During clamping, rapid coarse positioning is achieved by "visually comparing the spacing between the discs and the sample length". After one end of the sample is clamped by two clamping plates of one fixture body, the sample is swung so that the other end of the sample enters between two clamping plates of another fixture body, thus completing the clamping of the sample. This simplifies the clamping steps, making the clamping process simple and convenient.

[0011] Compared to the existing fixtures that require simultaneous operation of the lifting rod (to open the jaws), the testing machine (to move the fixture), and observation of the insertion depth after the first end is fixed, this invention uses a clamping plate setting method (rotating shaft + double bearings) to enable the clamping plates to rotate. When clamping the end, only the corresponding fixture lifting rod needs to be adjusted to open the clamping plates, and force can be applied to swing the sample to allow the end to enter between the two clamping plates. There is no need to control multiple actions simultaneously, and a single person can smoothly complete the clamping, reducing the difficulty of operation, effectively avoiding the mental fatigue caused by "three tasks at once", and significantly improving the safety and comfort of operation.

[0012] This invention enables independent clamping by a single person, eliminating the need for additional operators, thus reducing labor costs and avoiding operational errors caused by discrepancies in the coordination rhythm between two people. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of one possible state structure when the present invention is in use.

[0015] Explanation of reference numerals in the attached drawings: 100, clamping piece; 200, rotating shaft; 201, first shaft segment; 202, second shaft segment; 300, thrust bearing; 301, first elastic retaining ring; 400, radial bearing; 401, second elastic retaining ring; 500, positioning block; 600, lifting disc; 700, lifting rod; 800, foam core material sample. Detailed Implementation

[0016] The core of this utility model is to provide a foam core material shear strength testing fixture, which aims to solve the defects of existing foam core material shear strength testing fixtures, which require a single person to "do three things at once" for clamping, making operation inconvenient, and require two people to cooperate, which increases labor costs; through rotatable clamping plates and clamping logic, a single person can easily complete the clamping of the sample, reducing the complexity of operation and labor costs.

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. 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.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "setting", "installing", "connecting", "joining", "fixing", "sleeving", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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 utility model.

[0020] In a specific embodiment of this utility model, such as Figures 1-3 As shown, the fixture body can be the wire clamp disclosed in the patents CN103454146A, CN103454148A and CN103454147A. The main difference between this application and the other applications is that the clamping plate 100 is set in a different way. The clamping plate (100) is rotatably connected to the positioning block (500) through a "rotating shaft + double bearing", so that the clamping plate 100 can rotate. Other structures are existing technologies and will not be described in detail here.

[0021] The clip 100 is set in the following manner: This application also includes: The rotating shaft 200 has one end fixedly connected to the clamping piece 100 of the fixture body, and is set in a one-to-one correspondence with the clamping piece 100; The mounting hole is formed on the positioning block 500 of the fixture body. Its inner end is rotatably connected to the end of the rotating shaft 200 away from the clamping piece 100 through an axial force-bearing component. It is used to bear the axial force transmitted from the clamping piece 100, avoid friction between the rotating shaft 200 and the mounting hole, and reduce the rotational resistance of the rotating shaft 200. Its outer end is rotatably connected to the end of the rotating shaft 200 near the clamping piece 100 through a radial force-bearing component. It is used to bear the radial force transmitted from the clamping piece 100, avoid friction between the rotating shaft 200 and the mounting hole, and reduce the rotational resistance of the rotating shaft 200.

[0022] In a specific embodiment of this utility model, such as Figure 1 and 2 As shown, the rotating shaft 200 includes a first shaft segment 201 and a second shaft segment 202 that are coaxially fixedly connected. The first shaft segment 201 and the second shaft segment 202 can be integrally formed. The axial force-bearing component is disposed between the inner end of the mounting hole and the first shaft segment 201, and the radial force-bearing component is disposed between the outer end of the mounting hole and the second shaft segment 202. The end of the second shaft segment 202 away from the first shaft segment 201 protrudes from the mounting hole and is welded or bolted to the clamp 100 for fixed connection.

[0023] In a specific embodiment of this utility model, such as Figure 1 and 2As shown, the axial force-bearing assembly includes a thrust bearing 300 disposed at the inner end of the mounting hole. A first shaft segment 201 is interference-fitted with the inner wall of the shaft ring of the thrust bearing 300. The diameter of a second shaft segment 202 is larger than the diameter of the first shaft segment 201, and the end face of the second shaft segment 202 away from the clamping plate 100 abuts against the shaft ring of the thrust bearing 300. The thrust bearing 300 shown in the attached figure is a thrust ball bearing, with its housing ring interference-fitted with the mounting hole. A first elastic retaining ring 301 is provided between the shaft ring and the mounting hole. The connection method between the thrust ball bearing or other types of thrust bearing 300 and the mounting hole and shaft is prior art and will not be described in detail here.

[0024] In a specific embodiment of this utility model, such as Figure 1 and 2 As shown, the radial force-bearing assembly includes a radial bearing 400 disposed at the outer end of the mounting hole, and the second shaft segment 202 is interference-fitted with the inner ring of the radial bearing 400. The radial bearing 400 shown in the attached figure is a cylindrical roller bearing, with its outer ring interference-fitted with the mounting hole, and a second elastic retaining ring 401 disposed between the outer ring and the mounting hole. The connection method between the cylindrical roller bearing or other radial bearing 400 and the mounting hole and shaft is prior art and will not be described in detail here.

[0025] When clamping the foam core material sample 800, if Figure 3 As shown, at this time, the two clamping plates 100 are in the closed state. The universal testing machine is operated to move the lifting fixture body vertically. Simultaneously, the foam core material sample 800 is held and positioned on one side of the two clamping fixture bodies. The clamping distance is adjusted visually—when the distance between the lifting discs 600 of the two clamps is approximately equal to the length of the foam core material sample 800 (±5mm), the lifting fixture body stops moving. Then, the operator adjusts the lifting rod 700 of one clamping fixture body so that the two clamping plates 100 are further apart. First, insert one end of the foam core material sample 800 between the two clamping plates 100. After releasing the lifting rod 700, the two clamping plates 100 clamp one end of the foam core material sample 800. Then, the operator adjusts the lifting rod 700 of the other fixture body so that the two clamping plates 100 are far apart. Force is applied to the foam core material sample 800, causing its other end to swing. The other end of the foam core material sample 800 gradually enters between the two clamping plates 100. After releasing the lifting rod 700, the two clamping plates 100 clamp the other end of the foam core material sample 800.

[0026] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably, and the embodiments can be combined with each other. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0027] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A shear strength testing fixture for foam core materials, comprising a fixture body, characterized in that, Also includes: A rotating shaft (200) has one end fixedly connected to the clamping piece (100) of the fixture body, and is arranged in a one-to-one correspondence with the clamping piece (100); The mounting hole is formed on the positioning block (500) of the fixture body. Its inner end is rotatably connected to the end of the rotating shaft (200) away from the clamping piece (100) through an axial force-bearing component, and its outer end is rotatably connected to the end of the rotating shaft (200) near the clamping piece (100) through a radial force-bearing component.

2. The foam core material shear strength testing fixture according to claim 1, characterized in that: The rotating shaft (200) includes a first shaft segment (201) and a second shaft segment (202) that are coaxially fixedly connected. The axial force-bearing component is disposed between the inner end of the mounting hole and the first shaft segment (201), and the radial force-bearing component is disposed between the outer end of the mounting hole and the second shaft segment (202). The end of the second shaft segment (202) away from the first shaft segment (201) protrudes from the mounting hole and is fixedly connected to the clamp (100).

3. The foam core material shear strength testing fixture according to claim 2, characterized in that: The axial force-bearing component includes a thrust bearing (300) disposed at the inner end of the mounting hole. The first shaft segment (201) is interference-fitted with the inner wall of the shaft ring of the thrust bearing (300). The diameter of the second shaft segment (202) is larger than the diameter of the first shaft segment (201). The end face of the second shaft segment (202) away from the clamp (100) abuts against the shaft ring of the thrust bearing (300).

4. The foam core material shear strength testing fixture according to claim 2, characterized in that: The radial force-bearing component includes a radial bearing (400) disposed at the outer end of the mounting hole, and the second shaft segment (202) is interference-fitted with the inner ring of the radial bearing (400).

Images