Composite material v-shaped notch shearing hydraulic clamp structure and testing machine

Abstract

This invention discloses a composite material V-notch shear hydraulic clamp and testing machine. The clamp has a clamping body, including an upper clamp and a lower clamp, which are arranged opposite to each other. A clamping mechanism is installed on the upper and lower clamps, and the test sample is clamped between the clamping mechanisms on the upper and lower clamps. A guide component is installed at a diagonal position opposite to the upper and lower clamps, connecting the upper and lower clamps. A positioning component is located between the upper and lower clamps for positioning the test sample. This invention clamps the test sample through the cooperation of the jaws and the jack, making operation extremely convenient and the clamping force stable and controllable. The jack and the moving jaws are connected by a magnetic structure, facilitating disassembly and assembly. The guide shaft and linear bearing cooperate to guide, ensuring that the relative position of the upper and lower clamps remains unchanged during disassembly. The rubber pad effectively protects the clamp, and the positioning component can position the sample in two directions, making operation convenient and positioning accurate.

Description

Technical Field

[0001] This invention relates to the field of testing tooling technology, and more particularly to a composite material V-notch shear hydraulic fixture structure and testing machine. Background Technology

[0002] Composite materials play a vital role in the development of modern science and technology. The depth of research, the breadth of application, and the speed and scale of production of composite materials have become important indicators of a country's scientific and technological advancement. After being manufactured, composite materials cannot be directly applied to daily life; they must undergo extensive experimentation, data comparison, and step-by-step improvements to ultimately obtain composite materials with the highest practicality and best safety.

[0003] The American Society for Testing and Materials (ASTM) is one of the world's largest standards development organizations, with numerous testing standards for composite materials. ASTM D7078 / D7078M, a standard test method for determining the shear properties of composite materials using the V-notch shear method, is one such standard test method. Figure 1 The image shows ASTM D7078 / D7078M standard specimen 1, which has two opposing V-notches 10 and a composite material facet 11.

[0004] To implement this test method, test fixtures are required. Traditional V-notch shear tests employ fixtures such as… Figure 2 The manual shearing fixture A shown in the figure has an upper fixture A1 and a lower fixture A2. The test sample is standard sample 1, located between the upper fixture A1 and the lower fixture A2. The traditional V-notch shearing fixture has the following problems that urgently need to be solved during use:

[0005] ① The centering process is complex. When installing the test sample, a positioning block is used. The positioning block is difficult to center in the forward and backward direction, so two people are needed to cooperate in the installation.

[0006] ②The standard specifies a tightening torque of 55 N / m for the screws, which is a relatively large force and makes the operation difficult;

[0007] ③ If the thickness direction of the sample is irregular after it is installed, the jaw position of the upper and lower clamps is incorrect, or the coaxiality of the equipment is not good, then one end of the upper and lower clamps will not be able to be inserted into the connector of the testing machine.

[0008] Therefore, there is an urgent need for a composite material V-notch shear hydraulic fixture and testing machine to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0009] The purpose of this invention is to provide a composite material V-notch shearing hydraulic fixture and testing machine, which solves the problems of poor alignment, high difficulty in torque operation, and low coaxiality of existing shearing fixtures.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] A composite material V-notch shearing hydraulic clamp, comprising at least:

[0012] The fixture body includes an upper fixture and a lower fixture, which are arranged opposite to each other, and the sample to be tested is located between the opposing upper fixture and the lower fixture; a connector is provided on the upper fixture and the lower fixture, and the upper fixture and the lower fixture are connected to the testing machine through the connector;

[0013] A clamping mechanism is mounted on the upper clamp and the lower clamp, and the sample to be tested is clamped between the clamping mechanism on the upper clamp and the lower clamp;

[0014] A guide assembly is installed at a diagonal position opposite to the upper clamp and the lower clamp, the guide assembly connects the upper clamp and the lower clamp, and the upper clamp and the lower clamp are fixed in relative position by the guide assembly arranged diagonally along the diagonal;

[0015] A positioning component, located between the upper clamp and the lower clamp, includes a V-shaped notch positioning structure and a lateral positioning structure, used for positioning the test sample.

[0016] As an optional solution, both the upper clamp and the lower clamp are configured as L-shaped structures. The part of the L-shaped structure that connects to the connector is defined as the horizontal clamp part, and the other part of the L-shaped structure is the vertical clamp part. The clamping mechanism is mounted on the vertical clamp part.

[0017] As an optional solution, a pad is provided between the horizontal clamp and the connector.

[0018] As an optional solution, the vertical clamping part is provided with a mounting groove, and the clamping mechanism is installed in the mounting groove.

[0019] As an optional solution, the mounting slot has a first slot, a second slot, and a connecting slot, wherein the connecting slot is located between the first slot and the second slot, and connects the first slot and the second slot.

[0020] As an optional embodiment, the clamping mechanism has a jaw assembly, which has a movable jaw and a fixed jaw, with a space between the movable jaw and the fixed jaw for clamping the test sample. The test sample is clamped in the space between the movable jaw and the fixed jaw. The movable jaw and the fixed jaw are installed in the first groove of the mounting slot, wherein the fixed jaw is fixed to the vertical clamping part. The movable jaw can slide along the first groove.

[0021] As an optional solution, the movable jaw is configured as a T-shaped structure, with the flat part of the T-shaped structure located in the first groove and the protruding part of the T-shaped structure located in the connecting groove, and the movable jaw can slide along the first groove and the connecting groove.

[0022] As an optional solution, the jaws of the moving jaw and the fixed jaw of the jaw assembly have toothed structures with the toothed surfaces facing upwards, so as to achieve better engagement of the test sample during tensile testing.

[0023] As an optional solution, the clamping mechanism has a power component, which is a separate hydraulic jack. The jack portion of the separate hydraulic jack is located in the second groove, and the hydraulic pump of the separate hydraulic jack is located outside the hydraulic clamp. The lifting member at one end of the jack can extend into the communicating groove and is connected to the T-shaped protrusion of the moving jaw by magnetic attraction. The other end of the jack is fixed to the vertical clamp portion.

[0024] As an optional solution, a baffle is installed in the communicating groove, and the baffle is located between the communicating groove and the protrusion of the moving jaw T-shaped structure to prevent the moving jaw from moving up and down.

[0025] As an optional solution, the upper clamp is also provided with a notch located below the mounting groove. More specifically, the notch is located below the first groove. One end of the notch is connected to the first groove, and the other end extends to the edge of the upper clamp and the lower clamp. The notch is located in the space between the fixed jaw and the movable jaw where the test sample can be clamped, so that the test sample can be moved from the notch into the clamping space between the fixed jaw and the movable jaw.

[0026] As an optional solution, the lower clamp is also provided with a sliding groove, which is located on the side of the horizontal clamping part of the lower clamp facing the test sample, and the V-shaped notch positioning structure of the positioning component is located above the sliding groove.

[0027] As an optional embodiment, the guide assembly has a guide shaft and a linear bearing. The vertical clamping portion of the upper clamp and the lower clamp are provided with a first guide hole, and the horizontal clamping portion of the upper clamp and the lower clamp are provided with a second guide hole. The linear bearing is installed in the second guide hole of the horizontal clamping portion. One end of the guide shaft is fixed to the vertical clamping portion of the lower clamp. The guide shaft and the first guide hole on the vertical clamping portion of the lower clamp are clearance-fitted with a tolerance fit of H7 / H6. The other end extends through the linear bearing and out of the second guide hole of the upper clamp.

[0028] As an optional solution, the guide shaft is fixed to the vertical clamping part of the lower clamp by a guide shaft support. The guide shaft support adopts an L-shaped structure. The horizontal part of the L-shaped structure is fitted with a through hole on the upper surface of the vertical clamping part. The guide shaft extends through the through hole into the first guide hole of the lower clamp. The vertical part of the L-shaped structure is fitted with the side surface of the vertical clamping part and is fixed to the vertical clamping part by a locking member.

[0029] As an optional solution, a rubber pad is provided between the horizontal part of the L-shaped structure of the guide shaft support, which is not in contact with the vertical clamping part, and the horizontal clamping part of the upper clamping fixture to protect the clamping fixture.

[0030] As an optional solution, the V-shaped notch positioning structure in the positioning component has a rectangular structure. One end of the rectangular body can be set on the slide groove of the lower clamp, and the other end of the rectangular body is provided with a V-shaped protrusion. The V-shaped protrusion matches the V-shaped notch of the test sample. During installation and positioning, the V-shaped notch of the test sample is completely fitted with the V-shaped protrusion.

[0031] As an optional solution, the lateral positioning structure in the positioning component is L-shaped, with the inner side of the L-shape fitting against the outer side of the fixed jaw and fixed to the fixed jaw. The other vertical side is located on the side of the fixed jaw that fits against the test sample. After the test sample is installed, the side of the test sample that is not clamped by the upper clamp abuts against the lateral positioning structure for positioning.

[0032] The present invention also provides a testing machine, wherein the clamping structure of the testing machine adopts the aforementioned composite material V-notch shear hydraulic clamp to complete the testing of ASTM D7078 / D7078M standard specimens.

[0033] The above-mentioned composite material V-notch shearing hydraulic clamp is used as follows:

[0034] ① First, connect the joints at both ends of the upper clamp and the lower clamp to the testing machine;

[0035] ② Secondly, control the position of the crossbeam of the testing machine to move the testing machine, leaving space between the upper clamp and the lower clamp for installing the test sample. Place the V-shaped notch positioning structure in the groove of the lower clamp, with the V-shaped protrusion of the V-shaped notch positioning structure facing upward. The V-shaped notch of the test sample fits with the V-shaped protrusion, and the composite material surface of the test sample contacts the fixed jaw of the lower clamp. Use the hydraulic pump with the power component located outside to drive the jack to gently press the side of the test sample that is not in contact with the fixed jaw.

[0036] ③ Next, control the position of the crossbeam of the testing machine to lower the upper clamp. The test sample enters the clamping range of the moving jaw and the fixed jaw of the upper clamp through the notch of the upper clamp. Then, control the crossbeam to move and set the load target. When the guide shaft support in the guide assembly of the upper clamp contacts the rubber gasket of the lower clamp, the test sample moves to the center position of the fixed jaw of the upper clamp. Use the hydraulic pump with the power component located outside to drive the jack to gently press the side of the test sample that is not in contact with the fixed jaw.

[0037] ④ Finally, the two hydraulic pumps connected to the upper clamp and the lower clamp are simultaneously pumped to the pressure required for the set load target to clamp the test sample. Then, the V-shaped notch positioning structure is knocked out to complete the clamping of the test sample.

[0038] Beneficial effects:

[0039] The composite material V-notch shear hydraulic clamp and testing machine proposed in this invention clamps the test sample through the cooperation of the moving jaws and the fixed jaws, and is further clamped by a jack. Operation is extremely convenient, and the clamping force is stable and controllable. The jack and the moving jaws are connected by a magnetic structure, facilitating disassembly and installation when cleaning the jaw structure. The teeth of the jaws face upwards, and the force on the test sample during tension is opposite to the direction of the teeth, allowing for better gripping of the sample and preventing slippage. The guide shaft and linear bearing provide guidance, ensuring that the relative positions of the upper and lower clamps do not change throughout the installation and disassembly of the test sample. Only one adjustment is needed during installation, eliminating the need for subsequent adjustments. The rubber pads in the guide assembly effectively protect the clamps from impact damage during clamping. The V-shaped positioning structure and the side positioning structure allow for positioning of the sample in two directions, ensuring convenient operation and accurate positioning. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the standard sample to be tested;

[0041] Figure 2 This is a schematic diagram of the structure of a traditional manual shearing fixture in the background art of this invention;

[0042] Figure 3 This is a schematic diagram of the assembly structure of the composite material V-notch shearing hydraulic fixture provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of an angle structure of the lower clamp and clamping mechanism provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the upper clamp structure provided in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the lower clamp structure provided in an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the guiding component structure provided in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the positioning component structure provided in an embodiment of the present invention.

[0048] In the picture:

[0049] 1. Test sample; 10. V-notch; 11. Composite material surface;

[0050] 20. Connector; 200. Shaft hole; 21. Spacer block;

[0051] 3. Hydraulic clamp; 30. Upper clamp; 300. Horizontal clamp part; 3001. Second guide hole; 301. Vertical clamp part; 3010. First guide hole; 302. Mounting groove; 3020. First groove body; 3021. Second groove body; 3022. Connecting groove body; 31. Lower clamp; 310. Slide groove; 32. Jaw assembly; 320. Moving jaw; 3200. Planar part; 3201. Protrusion; 321. Fixed jaw; 322. Jack; 3220. Lifting component; 323. Baffle; 330. Guide shaft; 331. Linear bearing; 332. Guide shaft support; 333. Rubber washer; 340. V-notch positioning block; 3400. V-shaped protrusion;

[0052] A. Manual shearing fixture; A1. Upper fixture; A2. Lower fixture. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0054] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0057] The test sample 1 targeted in this embodiment is as follows: Figure 1 As shown, this is an ASTM D7078 / D7078M standard specimen, which has two opposing V-notches 10 and a composite material facet 11.

[0058] like Figure 3-8 The image shows a composite material V-notch shearing hydraulic clamp as illustrated in this embodiment, which includes at least:

[0059] The fixture body includes an upper fixture 30 and a lower fixture 31, which are arranged opposite to each other. The test sample 1 is located between the opposing upper fixture 30 and lower fixture 31. A connector 20 is provided on the upper fixture 30 and lower fixture 31, and the upper fixture 30 and lower fixture 31 are connected to the testing machine through the connector 20.

[0060] The clamping mechanism is installed on the upper clamp 30 and the lower clamp 31. The test sample 1 is clamped between the clamping mechanism on the upper clamp 30 and the lower clamp 31.

[0061] The guide assembly 32 is installed at a diagonal position opposite to the upper clamp 30 and the lower clamp 31. The guide assembly connects the upper clamp 30 and the lower clamp 31, and the upper clamp 30 and the lower clamp 31 are fixed in relative position along the diagonally arranged guide assembly.

[0062] The positioning component, located between the upper clamp 30 and the lower clamp 31, includes a V-shaped notch positioning structure and a lateral positioning structure, and is used to position the test sample 1.

[0063] Combined with appendix Figure 3-8 The more specific structural description of the aforementioned composite material V-notch shear hydraulic clamp is as follows:

[0064] The upper clamp 30 and the lower clamp 31 have basically the same structure. Taking the structure of the upper clamp 30 as an example, the upper clamp 30 is set as an L-shaped structure. The part of the L-shaped structure that is connected to the connector 20 is defined as the horizontal clamp part 300. The other part of the L-shaped structure is the vertical clamp part 301. The clamping mechanism is installed on the vertical clamp part 301.

[0065] A pad 21 is provided between the horizontal clamp part 300 and the connector 20. The connector 20 is provided with a shaft hole 200. The connector 20 and the testing machine are connected by a shaft pin and the shaft hole 200.

[0066] The vertical clamping part 301 is provided with a mounting groove 302, and the clamping mechanism is installed in the mounting groove 302. The mounting groove has a first groove 3020, a second groove 3021 and a connecting groove 3022. The connecting groove 3022 is located between the first groove 3020 and the second groove 3021 and connects the first groove 3020 and the second groove 3021.

[0067] The lower clamp 31 also has a horizontal clamping part 300 and a vertical clamping part 301 of the upper clamp 30. The horizontal clamping part 300 and the vertical clamping part 301 of the upper clamp 30 and the lower clamp 31 are arranged parallel to each other. After the upper clamp 30 and the lower clamp 31 are arranged opposite each other, they form an open "U"-shaped structure. A clamping mechanism and a clamping test space for the test sample 1 are formed between the parallel horizontal clamping part 300 and the vertical clamping part 301.

[0068] The clamping mechanism has a jaw assembly 32, which has a movable jaw 320 and a fixed jaw 321. There is a space between the movable jaw 320 and the fixed jaw 321 for clamping the test sample 1. The test sample 1 is clamped in the space between the movable jaw 320 and the fixed jaw 321. The movable jaw 320 and the fixed jaw 321 are installed in the first groove 3020 of the mounting groove 302, wherein the fixed jaw 321 is fixed on the vertical clamping part 301. The movable jaw 320 can slide along the first groove 3020.

[0069] The fixed jaw 321 has a flat plate structure, and one side of the fixed jaw 321 is fixed to the vertical clamping part 301 by a threaded locking device (such as a screw or nut). The movable jaw 320 has a T-shaped structure, with the flat part 3200 of the T-shaped structure in the first groove 3020 and the protrusion 3201 of the T-shaped structure located in the connecting groove 3022. The movable jaw 320 can slide along the first groove 3020 and the connecting groove 3022. A baffle 323 is installed in the connecting groove 3022, and the baffle 323 is located between the connecting groove 3022 and the protrusion 3201 of the T-shaped structure of the movable jaw 320 to prevent the movable jaw 320 from moving up and down.

[0070] The jaw assembly 32 has a toothed structure at the jaws of the moving jaw 320 and the fixed jaw 321, with the toothed surfaces facing upwards, so as to achieve better engagement of the test sample 1 during the tensile test.

[0071] The clamping mechanism has a power component, which is a separate hydraulic jack. The jack 322 part of the separate hydraulic jack is located in the second groove 3021, and the hydraulic pump of the separate hydraulic jack is located outside the hydraulic clamp (not shown in the figure). The lifting member 3220 at one end of the jack 322 can extend into the communicating groove 3022 and is connected to the T-shaped protrusion 3201 of the moving jaw 320 by magnetic attraction. The other end of the jack 322 is fixed to the vertical clamp part 301.

[0072] The difference between the upper clamp 30 and the lower clamp 31 is that the upper clamp 30 is also provided with a notch 303. The notch 303 is located below the mounting groove 302. More specifically, the notch 303 is located below the first groove 3020. One end of the notch 303 is connected to the first groove 3020, and the other end extends to the edge of the upper clamp 30 and the lower clamp 31. The notch 303 is located in the space between the fixed jaw 321 and the movable jaw 320 where the test sample 1 can be clamped, so that the test sample 1 can be moved from the notch into the clamping space between the fixed jaw 321 and the movable jaw 320.

[0073] The difference between the lower clamp 31 and the upper clamp 30 is that the lower clamp 31 is also provided with a sliding groove 310. The sliding groove 310 is located on the side of the horizontal clamping part 300 of the lower clamp 31 facing the test sample 1, and the V-shaped notch positioning block 340 of the positioning component is located above the sliding groove 310.

[0074] The guide assembly has a guide shaft 330 and a linear bearing 331. The vertical clamping parts 301 of the upper clamp 30 and the lower clamp 31 are provided with a first guide hole 3010, and the horizontal clamping parts 300 of the upper clamp 30 and the lower clamp 31 are provided with a second guide hole 3001. The linear bearing 331 is installed in the second guide hole 3001 of the horizontal clamping part 300. One end of the guide shaft 330 is fixed to the vertical clamping part 301 of the lower clamp 31. There is a clearance fit between the guide shaft 330 and the first guide hole 3010 on the vertical clamping part 301 of the lower clamp 31, with a tolerance fit of H7 / H6. The other end extends out of the second guide hole 3001 of the upper clamp 30 through the linear bearing 331.

[0075] The guide shaft 330 is fixed to the vertical clamping part 301 of the lower clamp 31 by the guide shaft support 332. The guide shaft support 332 adopts an L-shaped structure. The horizontal part of the L-shaped structure is fitted with the upper surface of the vertical clamping part 301 and has a through hole. The guide shaft 330 extends through the through hole into the first guide hole 3010 of the lower clamp 31. The vertical part of the L-shaped structure is fitted with the side surface of the vertical clamping part 301 and is fixed to the vertical clamping part 301 by a locking member. The locking member can be a screw and nut structure.

[0076] A rubber gasket 333 is provided between the horizontal part of the L-shaped structure of the guide shaft support 332, which is not in contact with the vertical clamping part 301, and the horizontal clamping part 300 of the upper clamping part 30 to protect the clamping part.

[0077] The V-shaped notch positioning block 340 in the positioning assembly has a rectangular structure. One end of the rectangle can be set on the slide groove 310 of the lower clamp 31, and the other end of the rectangle is provided with a V-shaped protrusion 3400. The V-shaped protrusion 3400 matches the V-shaped notch 10 of the test sample 1. During installation and positioning, the V-shaped notch 10 of the test sample 1 and the V-shaped protrusion 3400 are completely fitted together. The side positioning structure 341 in the positioning assembly is L-shaped. The inner side of the L-shape fits the outer side of the fixed jaw 321 and is fixed on the fixed jaw 321. The other vertical side is located on the side of the fixed jaw 321 that fits the test sample 1. After the test sample 1 is installed, the side of the test sample 1 that is not clamped by the upper clamp 30 abuts against the side positioning structure 341 for positioning.

[0078] The above-mentioned composite material V-notch shearing hydraulic clamp is used as follows:

[0079] ① First, connect the connectors 20 at both ends of the upper clamp 30 and the lower clamp 31 to the testing machine;

[0080] ② Next, control the position of the crossbeam of the test machine to leave space between the upper clamp 30 and the lower clamp 31 to install the test sample 1. Place the V-shaped notch positioning block 340 in the slide groove 310 of the lower clamp 31. The V-shaped protrusion 3400 of the V-shaped notch positioning block 340 faces upward. The V-shaped notch 10 of the test sample 1 fits with the V-shaped protrusion 3400. The composite material surface 11 of the test sample 1 contacts the fixed jaw 321 of the lower clamp 31. Use the hydraulic pump with the power component located outside to drive the jack 322 to gently press the side of the test sample 1 that is not in contact with the fixed jaw 321.

[0081] ③ Next, control the position of the crossbeam of the testing machine to lower the upper clamp 30. The test sample 1 enters the clamping range of the moving jaw 320 and the fixed jaw 321 of the upper clamp 30 through the notch of the upper clamp 30. Then control the crossbeam to move and set the load target. When the guide shaft support 332 in the guide assembly of the upper clamp 30 contacts the rubber gasket 333 of the lower clamp 31, the test sample 1 moves to the center position of the fixed jaw 321 of the upper clamp 30. Use the hydraulic pump with the power component located outside to drive the jack 322 to gently press the side of the test sample 1 that is not in contact with the fixed jaw 321.

[0082] ④ Finally, the two hydraulic pumps connected to the upper clamp 30 and the lower clamp 31 are simultaneously pumped to the pressure required for the set load target to clamp the test sample 1. Then, the V-shaped notch positioning block 340 is knocked out to complete the clamping of the test sample 1.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A composite material V-notch shearing hydraulic clamp, characterized in that, At least including: The clamping body includes an upper clamp and a lower clamp, which are arranged opposite to each other. The test sample is located between the opposing upper and lower clamps. A connector is provided on the upper and lower clamps, connecting them to a testing machine. Both the upper and lower clamps are L-shaped, with the portion of the L-shaped structure connected to the connector defined as a horizontal clamping part and the other portion as a vertical clamping part. A mounting groove is provided on the vertical clamping part, comprising a first groove, a second groove, and a connecting groove. The connecting groove is located between the first and second grooves, connecting them. A clamping mechanism is mounted on the upper clamp and the lower clamp, and is installed within the mounting groove; the test sample is clamped between the clamping mechanism on the upper clamp and the lower clamp; more specifically, the clamping mechanism has a jaw assembly and a power component, the jaw assembly has a movable jaw and a fixed jaw, and there is a space between the movable jaw and the fixed jaw for clamping the test sample, the test sample is clamped within the space between the movable jaw and the fixed jaw; the movable jaw and the fixed jaw are installed in the first groove of the mounting groove, and the fixed jaw is fixed to the vertical clamping part; the movable jaw can move along the... The first groove body slides, and the movable jaw is configured with a T-shaped structure. The flat part of the T-shaped structure is located in the first groove body, and the protruding part of the T-shaped structure is located in the connecting groove body. The movable jaw can slide along the first groove body and the connecting groove body. The power component is a separate hydraulic jack. The jack part of the separate hydraulic jack is located in the second groove body, and the hydraulic pump of the separate hydraulic jack is located outside the hydraulic clamp. The lifting member at one end of the jack can extend into the connecting groove body and is connected to the protruding part of the T-shaped structure of the movable jaw by magnetic attraction. The other end of the jack is fixed to the vertical clamp part. A guide assembly is installed at a diagonal position opposite to the upper clamp and the lower clamp, the guide assembly connects the upper clamp and the lower clamp, and the upper clamp and the lower clamp are fixed in relative position by the guide assembly arranged diagonally along the diagonal; A positioning component, located between the upper clamp and the lower clamp, includes a V-shaped notch positioning structure and a lateral positioning structure, used for positioning the test sample.

2. The composite material V-notch shearing hydraulic clamp as described in claim 1, characterized in that, A pad is provided between the horizontal clamp and the connector.

3. The composite material V-notch shearing hydraulic clamp as described in claim 1, characterized in that, The jaw assembly has a toothed structure at the jaws of the moving jaw and the fixed jaw, with the toothed surface facing upwards, so as to achieve better engagement of the test sample during tensile testing.

4. The composite material V-notch shearing hydraulic clamp as described in claim 1, characterized in that, A baffle is installed inside the communicating groove. The baffle is located between the communicating groove and the protrusion of the moving jaw T-shaped structure to prevent the moving jaw from moving up and down.

5. The composite material V-notch shearing hydraulic clamp as described in claim 1, characterized in that, The upper clamp is also provided with a notch, which is located below the mounting groove. More specifically, the notch is located below the first groove. One end of the notch is connected to the first groove, and the other end extends to the edge of the upper clamp and the lower clamp. The notch is located in the space between the fixed jaw and the movable jaw that can hold the test sample, so that the test sample can be moved from the notch into the holding space between the fixed jaw and the movable jaw.

6. The composite material V-notch shearing hydraulic clamp as described in claim 1, characterized in that, The lower clamp is also provided with a sliding groove, which is located on the side of the horizontal clamping part of the lower clamp facing the test sample, and the V-shaped notch positioning structure of the positioning component is located above the sliding groove.

7. The composite material V-notch shearing hydraulic clamp as described in claim 6, characterized in that, The guiding assembly has a guide shaft and a linear bearing. The vertical clamping portion of the upper clamp and the lower clamp are provided with a first guide hole, and the horizontal clamping portion of the upper clamp and the lower clamp are provided with a second guide hole. The linear bearing is installed in the second guide hole of the horizontal clamping portion. One end of the guide shaft is fixed to the vertical clamping portion of the lower clamp. The guide shaft and the first guide hole on the vertical clamping portion of the lower clamp are clearance-fitted with a tolerance fit of H7 / H6. The other end passes through the linear bearing and extends out of the second guide hole of the upper clamp.

8. The composite material V-notch shearing hydraulic clamp as described in claim 7, characterized in that, The guide shaft is fixed to the vertical clamping part of the lower clamp by a guide shaft support. The guide shaft support has an L-shaped structure. The horizontal part of the L-shaped structure is fitted with a through hole on the upper surface of the vertical clamping part. The guide shaft extends through the through hole into the first guide hole of the lower clamp. The vertical part of the L-shaped structure is fitted with the side surface of the vertical clamping part and is fixed to the vertical clamping part by a locking member.

9. The composite material V-notch shearing hydraulic clamp as described in claim 8, characterized in that, A rubber pad is provided between the horizontal part of the L-shaped structure of the guide shaft support, which is not in contact with the vertical clamping part, and the horizontal clamping part of the upper clamping fixture to protect the clamping fixture.

10. The composite material V-notch shearing hydraulic clamp as described in claim 9, characterized in that, The V-shaped notch positioning structure in the positioning component has a rectangular structure. One end of the rectangle can be set on the slide groove of the lower clamp, and the other end of the rectangle is provided with a V-shaped protrusion. The V-shaped protrusion matches the V-shaped notch of the test sample. During installation and positioning, the V-shaped notch of the test sample is completely fitted with the V-shaped protrusion.

11. The composite material V-notch shearing hydraulic clamp as described in claim 10, characterized in that, The lateral positioning structure in the positioning assembly is L-shaped. The inner side of the L-shape is attached to the outer side of the fixed jaw and fixed to the fixed jaw. The other vertical side is located on the side of the fixed jaw that is attached to the test sample. After the test sample is installed, the side of the test sample that is not clamped by the upper clamp abuts against the lateral positioning structure for positioning.

12. A testing machine, characterized in that, The clamping structure of the testing machine adopts the composite material V-notch shear hydraulic clamp described in any one of claims 1-11 above, in order to complete the testing of ASTM D7078 / D7078M standard specimens.

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