Tensile property detection device for membrane material

Abstract

The invention relates to the technical field of membrane material tensile property detection, and particularly provides a membrane material tensile property detection device which comprises a detection platform, a supporting frame is vertically and fixedly arranged on the detection platform, an upper clamp and a lower clamp are vertically and slidably arranged on the supporting frame, and the upper clamp and the lower clamp clamp the upper end and the lower end of a membrane material. A rotating frame is further arranged on the detection platform, a detection clamp is vertically arranged on the rotating frame, the detection clamp comprises two detection units, the two detection units are clamped on the membrane material between the upper clamp and the lower clamp, and a cutting assembly is further arranged on the detection platform. After the upper clamp and the lower clamp clamp the upper end and the lower end of the membrane material, the cutting assembly cuts the membrane material into a vertical strip-shaped membrane material sample which is completely in a vertical state, it is ensured that the vertical strip-shaped membrane material is parallel to the supporting frame, detection errors caused by clamping inclination are avoided, the distance change detected by the detection clamp is more accurate, and the detection efficiency is improved. Therefore, the precision of a film stretching detection result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of film material tensile performance detection technology, in particular to a film material tensile performance detection device. Background Art

[0002] The membrane tensile properties testing device is a special equipment used to measure the tensile strength, elongation at break, elastic modulus and other mechanical properties of membrane materials such as films, sheets and plates. It is widely used in quality inspection and research and development in industries such as plastics, rubber, packaging materials and composite materials.

[0003] The elongation of the membrane material is an important parameter. During the test, the operator can measure the change in the length of the gauge segment during the stretching process by drawing a gauge on the membrane material, thereby calculating the elongation of the membrane material. During the test, the stretching detection device applies a tensile force to the membrane material through the upper and lower clamps, and there are two detection clamps between the upper and lower clamps. The two detection clamps are respectively clamped at the gauge position on the membrane material. The two detection clamps move up and down as the membrane material elongates. When the membrane material between the two detection clamps breaks, the distance moved between the two detection clamps at this time is the change in the gauge segment length, so that the elongation of the membrane material can be calculated.

[0004] However, when the above scheme is used to test the tensile properties of the membrane material, if the operator installs the membrane material at an angle, the test results will be inaccurate. The clamping force of the test fixture on the membrane material is generally constant, so that the stretching degree of the part of the membrane material clamped by the test fixture is different from the stretching degree of other parts of the membrane material. The clamping force of the two test fixtures will affect the extension of the membrane material, thereby causing inaccurate test results of the membrane material. Summary of the Invention

[0005] Based on this, it is necessary to provide a membrane tensile performance testing device to address the problem that when the operator installs the membrane at an angle during the tensile performance test, the test results may be inaccurate.

[0006] The above purpose is achieved through the following technical solutions: A device for detecting the tensile properties of a membrane material, comprising: A testing platform, wherein a support frame is vertically and fixedly provided on the testing platform, and an upper clamp and a lower clamp are vertically slidably provided on the support frame, and the upper clamp and the lower clamp are used to clamp the upper and lower ends of the membrane material; A cutting assembly capable of cutting the film material into vertical strips of film material, the cutting assembly comprising a cutting plate and a supporting plate, both of which are hingedly arranged on the support frame, the cutting plate being evenly arranged with at least two vertically extending knife grooves, and a cutting knife being slidably arranged in the knife groove; A rotating frame is vertically and rotatably arranged on the detection platform. A detection fixture is vertically slidably arranged on the rotating frame. The detection fixture includes two detection units. The two detection units can clamp the film material between the upper fixture and the lower fixture.

[0007] Furthermore, the two vertically extending knife grooves form a group, and multiple groups are evenly arranged on the cutting plate.

[0008] Furthermore, the two detection units form a group, the number of detection units is the same as the number of knife grooves, and the detection units are configured to clamp other vertical strips of film when one of the multiple vertical strips of film breaks.

[0009] Furthermore, the clamping force of the detection unit clamping the vertical strip film is negatively correlated with the stretching degree of the vertical strip film; The cam is secured to the chassis and is adapted to engage the locking cam of the locking cam, and the locking cam is adapted to engage the locking cam of the locking cam.

[0010] Furthermore, a connecting groove is opened inside the clamping plate, the rotating rod is located in the connecting groove, a protrusion is provided on the outer periphery of the limiting ring, a sliding groove is provided in the connecting groove, the sliding groove is parallel to the connecting groove, and the protrusion is located in the sliding groove.

[0011] Furthermore, the elastic member is a compression spring.

[0012] Furthermore, a driving assembly is provided on the support frame, and the driving assembly is used to drive the upper clamp and the lower clamp to move away from or closer to each other.

[0013] Furthermore, the driving assembly includes a first hydraulic cylinder and a second hydraulic cylinder, and the telescopic ends of the first hydraulic cylinder and the second hydraulic cylinder are fixedly connected to the upper clamp and the lower clamp respectively.

[0014] The beneficial effects of the present invention are: The present invention cuts the film material by setting a cutting component, and first clamps the upper and lower ends of the film material raw material, and then cuts it into vertical strip film material samples that are completely in a vertical state through the cutting component, ensuring that the vertical strip film material is parallel to the support frame, avoiding detection errors caused by clamping tilt, and making the distance change detected by the detection fixture more accurate, thereby improving the accuracy of the film material tensile test results.

[0015] The present invention provides multiple knife grooves on the cutting assembly, with two knife grooves forming a group, and there are multiple groups of knife grooves in total, so that more vertical strip film materials can be cut to obtain at least two samples, and the upper clamp and the lower clamp simultaneously stretch the multiple vertical strip film materials. When one of the multiple vertical strip film materials is broken, the detection clamp is clamped on the other unbroken vertical strip film materials, thereby reducing the influence of the detection clamp on the stretching of the vertical strip film materials.

[0016] The present invention provides a detection fixture with variable clamping force, and the clamping force gradually decreases as the vertical strip film is stretched, thereby further reducing the influence of the detection fixture on the stretching of the vertical strip film. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a device for detecting the tensile properties of a membrane material according to an embodiment of the present invention; Figure 2 A schematic diagram of a state in which a film material is cut by a tensile properties testing device for a film material according to an embodiment of the present invention; Figure 3 A schematic diagram of a state of a film material tensile property testing device provided by one embodiment of the present invention after film material cutting is completed; Figure 4 An exploded view of a device for testing the tensile properties of a membrane material according to an embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged view of part X of the tensile properties testing device for a membrane material provided in one embodiment; Figure 6 A schematic diagram of a film material tensile performance testing device provided by an embodiment of the present invention showing an unstretched film material; Figure 7 A schematic diagram of a state in which a film is stretched by a device for detecting the tensile properties of a film provided by an embodiment of the present invention; Figure 8 A schematic diagram of a state where a testing fixture of a device for testing the tensile properties of a membrane material according to an embodiment of the present invention is clamping a membrane material; Figure 9 A schematic structural diagram of a rotating frame, a testing fixture, and a film material of a device for testing the tensile properties of a film material provided in one embodiment of the present invention; Figure 10 for Figure 9 A partial enlarged view of the Y portion of the film tensile properties testing device provided in one embodiment; Figure 11 for Figure 9 A front view of a device for testing the tensile properties of a membrane provided in one embodiment; Figure 12 for Figure 11 A cross-sectional view along AA of a film tensile performance testing device provided in one embodiment; Figure 13 for Figure 12 A partial enlarged view of part Z of the film tensile properties testing device provided in one embodiment; Figure 14 for Figure 11 A cross-sectional view along line BB of a device for detecting the tensile properties of a membrane material provided in one embodiment.

[0018] in: 100, testing platform; 110, support frame; 120, upper fixture; 130, lower fixture; 140, chuck; 150, handle; 200, cutting assembly; 210, cutting plate; 220, supporting plate; 300, rotating frame; 310, vertical rod; 320, detection fixture; 330, clamping plate; 331, abutment block; 340, clamping block; 341, rotating block; 342, strip-shaped abutment surface; 350, rotating rod; 360, limiting ring; 370, connecting groove; 380, elastic member; 390, gap; 400, vertical strip membrane; 410, gauge line. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0021] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0022] Refer to the following Figures 1-14 To describe a film tensile properties detection device provided by the present invention.

[0023] The cam 120 is a vertically fixed support frame 110, and an upper clamp 120 and a lower clamp 130 are vertically slidably provided on the support frame 110. The upper clamp 120 and the lower clamp 130 respectively clamp the upper and lower ends of the membrane material (the membrane material is a test sample). When the upper clamp 120 and the lower clamp 130 move away from each other, the membrane material can be stretched. A rotating frame 300 is vertically and rotatably provided on the testing platform 100, and a testing clamp 320 is vertically slidably provided on the rotating frame 300. The testing clamp 320 includes two testing units, which are respectively clamped on the membrane material between the upper clamp 120 and the lower clamp 130. When the membrane material is stretched, the membrane material pulls the two testing units away from each other. When the membrane material is broken, the relative movement distance between the two testing units can be known, and the elongation of the membrane material can be calculated.

[0024] However, when the operator clamps the membrane material, the clamping position of the membrane material may be tilted, that is, the membrane material between the upper clamp 120 and the lower clamp 130 is not in a vertical state but is tilted. At this time, when the upper clamp 120 and the lower clamp 130 move away from each other to stretch the membrane material, the membrane material is unevenly stressed, resulting in inaccurate changes in the detection distance of the two detection units, thereby affecting the test results of the tensile properties of the membrane material.

[0025] Based on this, the present invention changes the clamping process of the membrane material. A cutting assembly 200 is provided on the support frame 110 of the present invention. The cutting assembly 200 is used to cut the membrane material clamped between the upper clamp 120 and the lower clamp 130, and the cutting assembly 200 can cut the entire membrane material into vertical strips (the vertical strip membrane material 400 is also a sample, and the sample has the same shape and size as the above sample), and the vertical strip membrane material 400 after cutting is completely in a vertical state, thereby avoiding the situation where the clamping is tilted when clamping the membrane material, resulting in inaccurate detection results.

[0026] It can be understood that the present invention first clamps the upper and lower ends of the membrane material, and then cuts the membrane material into vertical strip membrane materials 400 that are completely in a vertical state through the cutting component 200, and the vertical strip membrane material 400 is parallel to the support frame 110. After being clamped by the detection fixture 320, the upper clamp 120 and the lower clamp 130 are driven away from each other, which can ensure that the membrane material is stretched in a vertical state, thereby improving the distance change accuracy detected by the detection fixture 320, and thus improving the accuracy of the membrane material stretching detection results.

[0027] Specifically, the cutting assembly 200 in this embodiment includes a cutting plate 210 and a supporting plate 220. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the cutting plate 210 and the supporting plate 220 are both hingedly arranged on the supporting frame 110. When the supporting plate 220 and the cutting plate 210 rotate around the hinge position, they can approach each other, thereby clamping the film material that has been clamped and fixed by the upper clamp 120 and the lower clamp 130. At least two vertically extending knife grooves (not shown in the figure) are provided on the cutting plate 210. A cutting knife (not shown in the figure) is slidably arranged in the knife groove. The cutting knife slides along the knife groove to cut the film material between the upper clamp 120 and the lower clamp 130 into vertical strips. Then the operator cuts off the waste around the vertical strip film material 400. At this time, the vertical strip film material 400 is not affected by the waste around it. The upper clamp 120 and the lower clamp 130 are away from each other, so that the vertical strip film material 400 can be evenly stretched. At this time, the moving distance of the detection unit on the vertical strip film material 400 can accurately reflect the distance change when the film material is extended.

[0028] It should be noted that in the prior art, when testing the elongation of the film material, two gauge lines 410 are drawn on the vertical strip film material 400. The two gauge lines 410 are symmetrical about the midpoint of the length of the vertical strip film material 400. The gauge lines 410 on the vertical strip film material 400 are all at the same height. Figure 6 As shown, the operator then clamps the detection fixture 320 at the gauge lines 410 of the vertical strip film 400, and finally drives the upper fixture 120 and the lower fixture 130 away from each other to simultaneously stretch multiple vertical strip film 400. When the vertical strip film 400 is stretched, the two detection units in the detection fixture 320 will move away from each other. When the vertical strip film 400 breaks, the two detection units record the distance between the two gauge lines 410, thereby calculating the elongation of the film. It should be noted that the recorded data is only valid when the film breaks between the two detection units. If the break point is outside the two detection units, it means that the film between the two gauge lines 410 has not reached the limit, so the recorded data with the break point outside the two detection units is invalid.

[0029] The detection fixture 320 in the prior art will clamp the film material throughout the entire process of stretching the film material, and the clamping force of the detection fixture 320 is generally constant. Since the thickness of the film material will gradually decrease as it is gradually stretched, the part of the film material clamped by the detection fixture 320 will be stretched to a different degree from other parts of the film material due to the influence of the clamping force, that is, the part of the film material clamped by the detection fixture 320 will be stretched to a smaller degree, while the part of the film material not clamped by the detection fixture 320 will be stretched to a greater degree, thereby affecting the detection accuracy of the film material.

[0030] Therefore, the detection fixture 320 in the present invention clamps the film material only when the stretching degree of the film material is about to reach the limit, thereby reducing the influence of the clamping of the detection fixture 320. In order to obtain the stretching limit of the film material, the film material between the upper fixture 120 and the lower fixture 130 in this embodiment is cut into multiple vertical strip film materials 400 (that is, the larger film material raw material is cut into multiple samples). When the upper fixture 120 and the lower fixture 130 move away from each other, the multiple vertical strip film materials 400 are stretched at the same time, and the fracture of the multiple vertical strip film materials 400 is not synchronous. Therefore, when the first fracture occurs, the other vertical strip film materials 400 are close to the stretching limit. Therefore, the stretching limit of the vertical strip film material 400 can be known. At this time, the detection fixture 320 is clamped at the position of the gauge line 410 of the vertical strip film material 400.

[0031] It can be understood that when the vertical strip film material 400 is close to the tensile limit, the stretching degree of the vertical strip film material 400 is about to reach the limit, so the impact of the detection fixture 320 on the continued stretching of the vertical strip film material 400 when clamped is small. When the fracture position of the vertical strip film material 400 is between the two detection units of the detection fixture 320, the fracture position is recorded, so that the distance between the two gauge lines 410 at the moment of fracture of the vertical strip film material 400 can be known, and the elongation of the vertical strip film material 400 can be calculated based on the distance between the two gauge lines 410 before stretching. When the conventional technology detects the elongation of the film material, multiple experiments are conducted and the results of the multiple experiments are averaged to ensure the accuracy of the experimental results. In the present invention, one experiment can detect multiple vertical strip film materials 400, obtain multiple experimental results at the same time, and average the multiple experimental data to obtain a more accurate film elongation. Compared with traditional multiple experiments, the present invention can save a lot of time and improve detection efficiency.

[0032] Specifically, when there are multiple knife grooves on the cutting plate 210 in the present invention, the cutting plate 210 can cut and form multiple vertical strips of film materials 400 at one time, and the multiple vertical strips of film materials 400 are all in a vertical state to avoid tilting, so that the multiple vertical strips of film materials 400 can be stretched evenly. Each knife groove has the above-mentioned cutting knife, and the number of knife grooves is an even number, two by two in a group, and each group of knife grooves can cut out a vertical strip of film material 400. At the same time, two detection units form a group, and the number of detection unit groups is the same as the number of knife groove groups. If there are 8 knife grooves, 4 vertical strips of film materials 400 can be cut out, and there are four groups of detection units in total. If there are 10 knife grooves, 5 vertical strips of film materials 400 can be cut out, and there are five groups of detection units in total, and the two knife grooves in each group The spacing between them is 2 cm, so that vertical strip membrane materials 400 with a width of 2 cm can be cut out. The distance between each adjacent set of knife grooves is 1 cm. After the operator finishes cutting the membrane material, the upper and lower ends of the 1 cm wide waste material cut between adjacent vertical strip membrane materials 400 are cut off, so that there is a 1 cm wide gap 390 between adjacent vertical strip membrane materials 400. The gap 390 is used for the detection unit to pass through, which facilitates the detection unit to clamp the vertical strip membrane material 400.

[0033] By setting multiple sets of knife grooves on the cutting plate 210, multiple vertical strip membranes 400 can be cut at one time, and each vertical strip membrane 400 is in a vertical state, thereby ensuring that each vertical strip membrane 400 is evenly stretched, and by stretching multiple vertical strip membranes 400 at the same time, the tensile limit of the vertical strip membrane 400 can be known, and then the detection unit can be clamped on the gauge line 410 of the vertical strip membrane 400 at the appropriate time, thereby reducing the influence of the clamping effect of the detection unit on the accuracy of the tensile performance test results of the vertical strip membrane 400.

[0034] In a further embodiment, in order to further reduce the influence of the clamping effect of the detection fixture 320 on the accuracy of the tensile performance test results of the vertical strip film material 400, the clamping force of the detection fixture 320 in this embodiment gradually decreases in the process of clamping the vertical strip film material 400, that is, the clamping force of the detection fixture 320 is negatively correlated with the stretching degree of the vertical strip film material 400, that is, the greater the stretching degree of the vertical strip film material 400, the smaller the clamping force of the detection fixture 320, and the greater the stretching degree of the film material, indicating that the thickness of the film material is smaller. At this time, the clamping force of the detection fixture 320 on the film material is also reduced, thereby reducing the influence of the clamping force of the detection fixture 320 on the tensile performance test accuracy of the film material.

[0035] Specifically, the detection unit of the detection fixture 320 in this embodiment includes a clamping plate 330 and a clamping block 340. Figure 12 、 Figure 13 and Figure 14As shown, the clamping block 340 is elastically slidably arranged on the clamping plate 330, and there is a gap 390 between the clamping surface of the clamping plate 330 and the clamping surface of the clamping block 340. The gap 390 allows the film material to pass through, and the clamping block 340 can clamp the film material when it is close to the clamping plate 330. A rotating rod 350 is axially slidably arranged in the clamping plate 330. The rotating rod 350 has two parts, one part has a larger diameter and the other part has a smaller diameter. The end with the larger diameter of the rotating rod 350 is in rolling contact with the rotating frame 300, and the end with the smaller diameter of the rotating rod 350 is rotatably connected to the clamping block 340. The outer periphery of the smaller diameter part of the rotating rod 350 is coaxial and threadedly connected to the limit ring 360. The ring 360 can only move along the axial direction of the rotating rod 350 but cannot rotate. Therefore, when the rotating rod 350 rotates, the limit ring 360 will be driven to move along the axial direction of the rotating rod 350 through the action of the threaded connection. The outer periphery of the smaller diameter part of the rotating rod 350 is provided with an elastic member 380. The two ends of the elastic member 380 respectively abut the limit ring 360 and the inside of the clamping plate 330. The elastic member 380 is a compression spring. The elastic member 380 is compressed in the initial state. The elastic member 380 pushes the limit ring 360 to drive the rotating rod 350 to move axially so that the clamping block 340 is close to the clamping plate 330, so that the clamping surfaces of the clamping block 340 and the clamping plate 330 clamp the vertical strip membrane material 400.

[0036] It can be understood that when the upper clamp 120 and the lower clamp 130 stretch the film, the vertical strip film 400 can drive the two detection units to move away from each other, and the clamping plates 330 of the two detection units move vertically on the rotating frame 300, as shown in FIG. Figure 12 As shown, the rotating frame 300 has a vertical rod 310, which is parallel to the rotating frame 300. The vertical rod 310 is in rolling contact with the end of the rotating rod 350 with a larger diameter. Therefore, when the clamping plate 330 moves vertically, it can drive the rotating rod 350 to rotate around its own axis, and the rotating rod 350 drives the limiting ring 360 to move axially, as shown in FIG. Figure 12 and Figure 13 As shown, the limit ring 360 moves to the left, and the elastic member 380 between the limit ring 360 and the clamping plate 330 is partially released, so the abutment force of the elastic member 380 on the limit ring 360 is reduced, which also weakens the pushing effect on the rotating rod 350, thereby reducing the clamping force of the clamping block 340 on the film material, and when the degree of stretching of the film material is greater, the detection unit moves vertically farther, so that the rotating rod 350 drives the limit ring 360 to move farther to the left, thereby gradually reducing the clamping force of the clamping block 340 on the film material.

[0037] It should be noted that in this embodiment, the directions of the threaded connections of the rotating rod 350 and the limit ring 360 of the two detection units of the detection fixture 320 are opposite, that is, the rotation directions of the spiral grooves on the rotating rod 350 are opposite, so that when the upper detection unit moves upward and the lower detection unit moves downward, the rotating rod 350 can drive the limit ring 360 to move to the left.

[0038] Since the rotating rod 350 can rotate around its own axis and move axially, and the rotation around its own axis is achieved by rolling contact between the rotating rod 350 and the vertical rod 310, in order to avoid the rolling friction between the vertical rod 310 and the rotating rod 350 when the rotating rod 350 moves axially, a sliding sleeve (not shown in the figure) can be axially slidably sleeved on the end of the rotating rod 350 with a larger diameter in the present invention. A key groove is provided inside the sliding sleeve, and the key groove extends along the axial direction of the sliding sleeve. A limit key is fixedly provided on the outer periphery of the rotating rod 350, and the limit key is slidably provided in the key groove, so that the rotating rod 350 can move axially relative to the sliding sleeve without rotating circumferentially relative to the sliding sleeve. In addition, the sliding sleeve of the present invention is in rolling contact with the vertical rod 310, thereby avoiding affecting the rotation of the rotating rod 350 when the rotating rod 350 moves axially.

[0039] More specifically, Figure 12 and Figure 13 As shown, a connecting groove 370 is provided inside the clamping plate 330 of the present invention, and the connecting groove 370 is used to accommodate the rotating rod 350. The rotating rod 350 can rotate in the connecting groove 370 and can also move axially. A protrusion (not shown in the figure) is provided on the outer periphery of the limiting ring 360 of the rotating rod 350, and a sliding groove (not shown in the figure) is provided in the connecting groove 370. The protrusion of the limiting ring 360 is slidably set in the sliding groove. The setting of the protrusion and the sliding groove makes the limiting ring 360 only move axially in the connecting groove 370 and cannot rotate around its own axis, so that when the rotating rod 350 rotates, the limiting ring 360 can be driven to slide along the axial direction of the rotating rod 350 to adjust the length of the elastic member 380.

[0040] It should be noted that, in order to avoid interference between the cutting assembly 200 and the multiple detection units, the rotating frame 300 in this embodiment is initially in the state as shown in FIG. Figure 6As shown, the multiple groups of detection units on the rotating frame 300 do not contact the vertical strip film 400 and are away from the support frame 110, which facilitates the cutting assembly 200 to cut the film, thereby avoiding the multiple groups of detection units affecting the cutting plate 210 and the support plate 220 in cutting the film. After cutting, the cutting plate 210 and the support plate 220 rotate around the hinge position to reset, and then the operator pushes the rotating frame 300 to rotate around the rotation connection position, and the rotating frame 300 drives the multiple groups of detection units to move into the gap 390 between adjacent vertical strip film materials 400, and then the operator aligns the clamping surface of the clamping block 340 with the clamping surface of the clamping plate 330, so that the clamping surface of the clamping block 340 and the clamping surface of the clamping plate 330 clamp the vertical strip film 400, thereby avoiding interference between the cutting assembly 200 and the multiple groups of detection units.

[0041] Specifically, in order to facilitate the clamping block 340 to pass through the gap 390 and clamp the vertical strip film 400, the clamping block 340 in this embodiment is provided with a rotating block 341, one end of the rotating block 341 is rotatably connected to the clamping block 340, and a clamping block (not shown in the figure) is provided at the position where the rotating block 341 and the clamping block 340 are rotatably connected. The clamping block allows the rotating block 341 to only rotate 90 degrees. In the initial state, when the clamping block 340 is clamping the vertical strip film 400, as shown in FIG. Figure 5 As shown, the rotating block 341 is erected upward, and the rotating block 341 in this embodiment has an inclined surface, one end of the inclined surface is a strip-shaped abutting surface 342, and an abutting block 331 is fixedly provided at one end of the clamping plate 330 close to the clamping block 340, and the abutting block 331 also has an inclined surface, one end of the inclined surface is a clamping surface, and the clamping surface and the strip abutting surface 342 have the same shape and size. When the clamping block 340 passes through the gap 390 between the adjacent vertical strip membrane materials 400, the rotating block 341 rotates 90 degrees, so that the strip abutting surface 342 on the rotating block 341 corresponds to the clamping surface on the abutting block 331, as shown in FIG. Figure 10 As shown, the abutting block 331 and the rotating block 341 clamp the vertical strip film 400 .

[0042] It should also be noted that the structure capable of preventing interference between the cutting assembly 200 and the multiple detection units is not limited to the above-described structure, but may also be other structures, such as a sliding frame (not shown in the figure), on which the multiple detection units are mounted, and which is capable of sliding in a direction perpendicular to the plane formed by the multiple vertical strips of film 400. When the cutting assembly 200 is operating, the sliding frame moves away from the support frame 110, thereby moving the multiple detection units on the sliding frame away. When the cutting assembly 200 is completed and reset, the sliding frame brings the multiple detection units closer together, and the multiple detection units directly extend into the gaps 390 between adjacent vertical strips of film 400. Of course, other structures are also possible and are not specifically limited here.

[0043] In a further embodiment, a driving assembly is provided on the support frame 110 of the present invention, and the driving assembly is used to drive the upper clamp 120 and the lower clamp 130 to move closer to or away from each other. The driving assembly includes a first hydraulic cylinder (not shown in the figure) and a second hydraulic cylinder (not shown in the figure). The telescopic ends of the first hydraulic cylinder and the second hydraulic cylinder are fixedly connected to the upper clamp 120 and the lower clamp 130 respectively. The simultaneous shortening of the first hydraulic cylinder and the second hydraulic cylinder can drive the upper clamp 120 and the lower clamp 130 to move away from each other, thereby causing the upper clamp 120 and the lower clamp 130 to stretch the membrane material.

[0044] Specifically, the upper clamp 120 and the lower clamp 130 in this embodiment are each provided with two chucks 140, and the upper clamp 120 and the lower clamp 130 are threadedly connected with a push rod, one end of the push rod abuts against the chuck 140, and the other end of the push rod is provided with a handle 150. The operator rotates the push rod through the handle 150, and the push rod pushes the chuck 140 so that the two chucks 140 can clamp the film material, and the operator can adjust the clamping force of the chuck 140 on the film material by rotating the push rod.

[0045] The specific working process of the tensile properties testing device for a membrane material provided by the present invention is described in conjunction with the above embodiments: Clamping membrane: After the operator adjusts the positions of the upper clamp 120 and the lower clamp 130, the upper and lower ends of the membrane material are clamped. Then the operator rotates the cutting plate 210 and the supporting plate 220 around the hinge position so that the cutting plate 210 and the supporting plate 220 are in contact with the two surfaces of the membrane material respectively. The operator pushes the cutting knife inside the knife groove on the cutting plate 210 to cut the membrane material into multiple vertical strip membrane materials 400. At this time, the cutting plate 210 and the supporting plate 220 are rotated around the hinge position and reset. The operator takes out scissors and cuts off the waste between adjacent vertical strip membrane materials 400. The width of the waste is 1 cm. After cutting off the waste, the adjacent vertical strip membrane materials 400 are spaced 1 cm apart. Since the membrane material is clamped and fixed before cutting, the multiple vertical strip membrane materials 400 are parallel to each other, thereby avoiding the phenomenon of vertical strip membrane materials 400 being tilted.

[0046] Stretch: When the cutting plate 210 and the supporting plate 220 are reset, Figure 6 As shown, the operator draws two parallel gauge lines 410 on the multiple vertical strip membrane materials 400, and the positions of the gauge lines 410 are symmetrical about the midpoint of the length of the vertical strip membrane materials 400. After drawing, the operator starts the first hydraulic cylinder (not shown in the figure) and the second hydraulic cylinder (not shown in the figure), and the upper clamp 120 and the lower clamp 130 move away from each other to start stretching the multiple vertical strip membrane materials 400. The lengths of the multiple vertical strip membrane materials 400 gradually increase. The specific state is as shown in FIG. Figure 7As shown, at this time, the distance between the two gauge lines 410 on the multiple vertical strip membranes 400 gradually increases. When one of the multiple vertical strip membranes 400 breaks, and the break position is located between the two gauge lines 410, it means that the other vertical strip membranes 400 have reached or are about to reach the stretching limit. At this time, the upper clamp 120 and the lower clamp 130 are stopped and moved away from each other.

[0047] The detection fixture 320 clamps the vertical strip film 400: The operator adjusts the height of the multiple detection units of the detection fixture 320 on the rotating frame 300 so that the two detection units in each group correspond to the two gauge lines 410 of the vertical strip film 400. After the adjustment is completed, the operator turns the rotating frame 300, and the rotating frame 300 drives the multiple detection units to approach the vertical strip film 400, and passes the clamping blocks 340 of the detection units through the gaps 390 between the adjacent vertical strip film 400. The clamping plates 330 and clamping blocks 340 of each detection unit are perpendicular to the vertical strip film 400. Figure 8 As shown, the operator finally rotates the rotating block 341 on each clamping block 340 90°, so that the strip-shaped abutting surface 342 of the rotating block 341 corresponds to the clamping surface of the abutting block 331 on the clamping plate 330. Since the clamping block 340 is connected to the rotating rod 350 and the rotating rod 350 is provided with an elastic member 380, under the action of the elastic member 380, the rotating block 341 and the abutting block 331 clamp the vertical strip film material 400.

[0048] Continue stretching: After the detection unit is clamped on the vertical strip film material 400, the upper clamp 120 and the lower clamp 130 continue to move away from each other. Under the action of the vertical strip film material 400 continuing to stretch, since the detection unit clamps the vertical strip film material 400, the detection unit moves synchronously with the vertical strip film material 400, and the clamping plate 330 of the detection unit slides on the vertical rod 310. The rotating rod 350 inside the clamping plate 330 rolls in contact with the vertical rod 310 through the sliding sleeve (not shown in the figure). Therefore, when the clamping plate 330 moves, the rotating rod 350 can be driven to rotate around its own axis through the sliding sleeve. Since a limiting ring 360 is provided in the connecting groove 370 inside the clamping plate 330, the limiting ring 360 can only slide axially along the connecting groove 370 but cannot rotate circumferentially, and the limiting ring 360 is threadedly connected to the rotating rod 350, so when the rotating rod 350 rotates around its own axis, it can drive the limiting ring 360 to move axially. Figure 12 and Figure 13As shown, when the limit ring 360 moves to the left, the length of the elastic member 380 between the limit ring 360 and the clamping plate 330 increases, and the elastic member 380 is partially released. The pushing force of the elastic member 380 on the limit ring 360 is reduced, thereby reducing the force of the rotating rod 350 pulling the clamping block 340, thereby reducing the clamping force. It should be noted that the reduced clamping force can still clamp the vertical strip membrane material 400, avoiding the influence of excessive clamping force on the tensile performance of the vertical strip membrane material 400.

[0049] Get the test results: As the stretching continues, multiple vertical strip membranes 400 gradually break. A distance sensor (not shown in the figure) is provided on the clamping plate 330. The distance sensor can obtain the position of the gauge line 410 before and after movement, thereby calculating the movement distance of the gauge line 410. The data of the vertical strip membrane 400 whose fracture position is between the two gauge lines 410 is considered valid data, while the data of the vertical strip membrane 400 whose fracture position is not between the two gauge lines 410 is considered invalid data. Only valid data is taken when calculating the elongation, and the average of multiple valid data is taken.

[0050] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A device for detecting the tensile properties of a membrane material, characterized in that: include: A testing platform, wherein a support frame is vertically and fixedly provided on the testing platform, and an upper clamp and a lower clamp are vertically slidably provided on the support frame, and the upper clamp and the lower clamp are used to clamp the upper and lower ends of the membrane material; A cutting assembly capable of cutting the film material into vertical strips of film material, the cutting assembly comprising a cutting plate and a supporting plate, both of which are hingedly arranged on the support frame, the cutting plate being evenly arranged with at least two vertically extending knife grooves, and a cutting knife being slidably arranged in the knife groove; A rotating frame is vertically and rotatably arranged on the detection platform. A detection fixture is vertically slidably arranged on the rotating frame. The detection fixture includes two detection units. The two detection units can clamp the film material between the upper fixture and the lower fixture.

2. The film tensile properties testing device according to claim 1, characterized in that: The two vertically extending knife grooves form a group, and multiple groups are evenly arranged on the cutting plate.

3. The film tensile properties testing device according to claim 2, characterized in that: The two detection units form a group, the number of the detection units is the same as the number of the knife grooves, and the detection units are configured to clamp the other vertical strips of film when one of the multiple vertical strips of film is broken.

4. The film tensile properties testing device according to claim 3, characterized in that: The clamping force of the detection unit clamping the vertical strip film is negatively correlated with the stretching degree of the vertical strip film; The cam is secured to the chassis and is adapted to engage the locking cam of the locking cam, and the locking cam is adapted to engage the locking cam of the locking cam.

5. The film tensile properties testing device according to claim 4, characterized in that: A connecting groove is provided inside the clamping plate, the rotating rod is located in the connecting groove, a protrusion is provided on the outer periphery of the limiting ring, a sliding groove is provided in the connecting groove, the sliding groove is parallel to the connecting groove, and the protrusion is located in the sliding groove.

6. The film tensile properties testing device according to claim 5, characterized in that: The elastic member is a compression spring.

7. The film tensile properties testing device according to claim 1, characterized in that: The support frame is provided with a driving assembly, and the driving assembly is used to drive the upper clamp and the lower clamp to move away from or closer to each other.

8. The film tensile properties testing device according to claim 7, characterized in that: The driving assembly includes a first hydraulic cylinder and a second hydraulic cylinder, and the telescopic ends of the first hydraulic cylinder and the second hydraulic cylinder are fixedly connected to the upper clamp and the lower clamp respectively.

Images