A geotextile tensile strength testing device

Abstract

The present invention discloses a geotextile tensile strength testing device, which relates to the technical field related to geotextile testing, and includes a testing base. The testing base is provided with a force-applying component and two sets of clamping plate groups. The two sets of clamping plate groups stretch the clamped geotextile based on the driving force of the force-applying component. The two sets of clamping plate groups are rotatably arranged on the force-applying component. Based on the driving action of the force-applying component, the two sets of clamping plate groups have the following strokes: in the first stroke, the two sets of clamping plate groups clamp the two ends of the geotextile in the tensile direction respectively; in the second stroke, the two sets of clamping plate groups both rotate and respectively roll up the two ends of the geotextile.

Description

Technical Field

[0001] The present invention relates to the technical field related to geotextile detection, in particular to a geotextile tensile strength detection device. Background Art

[0002] As is known to all, geotextile is a permeable geosynthetic material made of synthetic fibers through needle punching or weaving. Geotextile tensile strength test is an important testing method in civil engineering. The strip tensile test is used to determine the tensile strength and elongation of geotextile. It refers to the maximum tensile force that a geotextile sample of unit width can withstand when stretched under external force. The strain corresponding to the maximum tensile force is called elongation.

[0003] When conducting a strip tensile test, the instrument that applies external force is a tensile testing machine, which has a constant-speed stretching function and can measure the tension and elongation of the geotextile during the stretching process or directly record the tension-elongation curve. For example, the announcement number is CN217211936U, the announcement date is August 16, 2022, and the name is "A geotextile tensile strength testing device", which relates to the technical field of testing equipment, specifically to a geotextile tensile strength testing device; including a frame, a mounting plate and auxiliary components, the auxiliary components include an initial positioning frame, an initial placement plate, a clamping hydraulic cylinder, a connecting shaft, a clamping block, a secondary positioning component and a driving component, in When comparing the tensile strength of two different geotextiles, one end of the geotextile is freely placed on the initial placement plate, and the clamping hydraulic cylinder is activated to clamp one end of the two geotextiles respectively. At the same time, the secondary positioning component will clamp the other end of the two geotextiles respectively. When both ends of the geotextile are clamped, the control system will control the action of the driving component to perform the tensile strength test of the geotextile. In this way, when comparing the tensile strength values of two different geotextiles, there is no need to take separate measurement and record methods for comparison, but can perform measurement and comparison at one time, which reduces working time and effectively improves work efficiency.

[0004] The shortcoming of the existing technology is that the geotextile being tested is clamped at both ends by a clamping block (clamping plate). When the tensile test is carried out, the two ends of the geotextile are flattened due to the force (during the tensile test, the thickness of the clamped part of the geotextile will gradually become thinner due to the tension), resulting in the two ends of the geotextile having a tendency to fall off from the clamping block, especially the corner parts at both ends are more likely to fall off. If the two ends of the geotextile fall off from the clamping block, it will obviously affect the tensile strength test of the geotextile, and even if it does not fall off, it will obviously increase the error of the tensile strength test of the geotextile. Summary of the Invention

[0005] The purpose of the present invention is to provide a geotextile tensile strength testing device to solve the technical problems in the related art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A geotextile tensile strength testing device includes a testing base, wherein the testing base is provided with a force-applying component and two sets of clamping plate groups. The two sets of clamping plate groups stretch the clamped geotextile based on the driving force of the force-applying component. The two sets of clamping plate groups are rotatably arranged on the force-applying component. Based on the driving action of the force-applying component, the two sets of clamping plate groups have the following strokes: in the first stroke, the two sets of clamping plate groups clamp the two ends of the geotextile in the tensile direction respectively; in the second stroke, both sets of clamping plate groups rotate and respectively roll up the two ends of the geotextile.

[0008] As mentioned above, the force-applying component includes: a first drive branch chain, which is used to drive the two sets of clamping plate groups to move relative to each other; a second drive branch chain, which drives the two sets of clamping plate groups to clamp the two ends of the geotextile in the length direction based on the power of the first drive branch chain; and a third drive branch chain, which drives the two sets of clamping plate groups to rotate relative to each other based on the power of the first drive branch chain.

[0009] As mentioned above, each set of the clamping plate group includes a first frame and two first shafts rotatably arranged on the first frame, two clamping plates are provided between the two first shafts for radial sliding, and in the sliding direction, a first elastic member is connected between each clamping plate and each first shaft, based on the elastic force of the first elastic member, the two clamping plates tend to move away from each other.

[0010] As mentioned above, a rod body is slidably provided on the first frame, and in the sliding direction, a second elastic member is provided between the rod body and the first frame body, and an extrusion plate is provided at one end of the transmission rod body facing the clamping plate. Based on the elastic force of the second elastic member, the extrusion plate tends to stick to the corresponding clamping plate.

[0011] As mentioned above, the cross section of the clamping plate is a semicircular structure, and a rubber sleeve is provided on the clamping plate.

[0012] As mentioned above, the surface of the rubber sleeve located between the two clamping plates is provided with lines parallel to the axial direction, and the lines on the two corresponding rubber sleeves are arranged alternately.

[0013] As mentioned above, the thickness of the portion of the rubber sleeve between the two clamping plates gradually increases axially toward both ends with the middle as the dividing line.

[0014] As mentioned above, a retaining groove is provided on the first frame. When the end of the geotextile in the length direction is placed between the two clamping plates, the end of the geotextile in the length direction passes through the space between the two clamping plates and rests on the retaining groove wall.

[0015] As mentioned above, the two first shafts corresponding to the first frame respectively limit the two sides of the geotextile in the width direction.

[0016] As mentioned above, the two first shafts corresponding to the first frame, one first shaft is connected to the first driving branch chain, and the other first shaft is provided with a ball, and a rolling groove for the ball to roll is provided on the detection base, and the rolling direction of the ball in the rolling groove is parallel to the relative movement direction of the two first frames.

[0017] The beneficial effect of the present invention is that the two ends of the geotextile are rolled up by rotating the two sets of clamping plate groups. As the length of the rolled geotextile gradually increases, the geotextile between the two sets of clamping plate groups will gradually be stretched. In this way, the part of the geotextile clamped by the clamping plate group is not the main force-bearing part. In this way, even if the part of the geotextile close to the clamping plate group is flattened by the force, the geotextile and the clamping plate group will not fall off, thereby ensuring that the tensile strength test of the geotextile can be carried out smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0021] Figure 3 A schematic cross-sectional structure diagram of a transmission shaft of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic planar structural diagram of a geotextile tensile strength testing device provided in an embodiment of the present invention, in which an extrusion block and a friction block are separated;

[0023] Figure 5 A schematic cross-sectional structure diagram of a clamping plate assembly of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of an exploded structure from a first-person perspective of a clamping plate assembly of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0025] Figure 7This is a schematic diagram of an exploded structure from a second perspective of a clamping plate assembly of a geotextile tensile strength testing device provided in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the planar structure of the cooperation between the rod body and the second frame body of a geotextile tensile strength testing device provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Detection base; 2. Clamping plate assembly; 20. Clamping plate; 21. First frame; 22. First shaft; 23. Slide; 24. Slider; 25. Rod; 26. Extrusion plate; 27. Rubber sleeve; 28. Stop groove; 3. Force-applying assembly; 30. Drive source; 31. Transmission shaft; 310. Threaded section; 311. Non-threaded section; 32. Transmission block; 33. Transmission connecting rod; 34. Track; 35. Slide; 36. Conical surface; 37. Extrusion ring; 38. First A rack; 39, a second shaft; 40, a first gear; 41, a second gear; 42, a second frame; 420, a non-pressurized surface; 421, a pressurized surface; 43, a second rack; 44, a third gear; 45, a fourth gear; 46, a third shaft; 47, an extrusion block; 48, a pressure ring; 49, a friction block; 50, a first extrusion surface; 51, a first pressure surface; 52, a second extrusion surface; 53, a second pressure surface; 54, a ball; 55, a groove; 6, a geotextile. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 8 The present invention is further described in detail.

[0030] An embodiment of the present invention provides a geotextile tensile strength testing device, including a testing base 1, on which a force-applying component 3 and two sets of clamping plate groups 2 are provided. The two sets of clamping plate groups 2 stretch the clamped geotextile 6 based on the driving force of the force-applying component 3. The two sets of clamping plate groups 2 are rotatably arranged on the force-applying component 3. Based on the driving action of the force-applying component 3, the two sets of clamping plate groups 2 have the following strokes: in the first stroke, the two sets of clamping plate groups 2 clamp the two ends of the geotextile 6 in the tensile direction respectively; in the second stroke, the two sets of clamping plate groups 2 both rotate and respectively roll up the two ends of the geotextile 6.

[0031] Specifically, for the tensile strength test of the geotextile 6, a rectangular geotextile 6 is intercepted, and its specific length and width are the existing technology, which will not be described in detail here. When the intercepted geotextile 6 is clamped, a set of clamping plate groups 2 composed of two clamping plate groups 2 are used to clamp the ends of the geotextile 6 in the length direction, that is, the two ends of the geotextile 6 in the length direction are clamped by another set of clamping plate groups 2, and then the two clamping plate groups 2 generate a tensile force on the clamped geotextile 6 under the drive of the force component 3. However, in the existing technology, for the geotextile being tested, 6 is clamped at both ends of the geotextile 6 by the clamping plate 20. When the tensile strength test is performed, the two ends of the geotextile 6 are flattened by the force (that is, during the tensile test, the thickness of the clamped part of the geotextile 6 will gradually become thinner due to the tension), resulting in the two ends of the geotextile 6 tending to fall off from the clamping plate group 2, especially the corner parts at both ends are more likely to fall off. If the two ends of the geotextile 6 fall off from the clamping plate group 2, it will obviously affect the tensile strength test of the geotextile 6, and even if it does not fall off, it will obviously increase the error of the tensile test of the geotextile 6.

[0032] Based on the above technical problems, in this embodiment, each set of clamping plate groups 2 is arranged to rotate on the force-applying component 3, that is, the force-applying component 3 includes a linear drive component that drives the two clamping plates 20 in each set of clamping plate groups 2 to move relative to each other, and a circumferential drive component that drives each set of clamping plate groups 2 to rotate and reel in the geotextile 6, wherein the linear drive component is such as a screw transmission mechanism, and the circumferential drive component is such as a motor. These are all existing technologies and will not be repeated. When the corresponding intercepted geotextile 6 is subjected to a tensile test, the linear drive component drives the two clamping plates 20 in the corresponding clamping plate group 2 to move away from each other to provide space for the geotextile 6 to enter. The two sets of clamping plate groups 2 respectively clamp the two ends of the geotextile 6 in the length direction, and then the circumferential drive component can drive the two sets of clamping plate groups 2 to rotate and gradually reel in the geotextile 6 from the two ends in the length direction. 6 is cut to a length greater than the length cut in the prior art, that is, if the length of the geotextile 6 cut in the prior art is 200 mm and the width is 50 mm, then the length of the geotextile 6 cut in this embodiment is 300 mm and the width is 50 mm. In this way, the circumference of each clamping plate group 2 after clamping the end of the geotextile 6 can be between 20 mm and 50 mm, and the geotextile 6 can be wound 2 to 5 times on each set of clamping plate groups 2. The reserved length in the middle is the length required for the geotextile 6 to undergo a tensile test. Afterwards, as the geotextile 6 is stretched, the geotextile 6 wound on the clamping plate group 2 will gradually be locked. In this way, on the basis of the clamping plate group 2 clamping the end of the geotextile 6 in the length direction, the friction between the inner and outer layers of the geotextile 6 can also be used to prevent the geotextile 6 from falling off the clamping plate group 2.

[0033] The beneficial effect of this embodiment is that: by utilizing the rotation of the two sets of clamping plate groups 2 to roll up the two ends of the geotextile 6, as the length of the rolled geotextile 6 gradually increases, the geotextile 6 between the two sets of clamping plate groups 2 will be gradually stretched, so that the part of the geotextile 6 clamped by the clamping plate group 2 is not the main force-bearing part. In this way, even if the part of the geotextile 6 close to the clamping plate group 2 is flattened by the force, the geotextile 6 and the clamping plate group 2 will not fall off, thereby ensuring that the tensile strength test of the geotextile 6 can be carried out smoothly.

[0034] Preferably, the force-applying component 3 includes: a first drive branch chain, which is used to drive the two sets of clamping plate groups 2 to move relative to each other; a second drive branch chain, which drives the two sets of clamping plate groups 2 to clamp the two ends of the geotextile 6 in the length direction based on the power of the first drive branch chain; and a third drive branch chain, which drives the two sets of clamping plate groups 2 to rotate relative to each other based on the power of the first drive branch chain.

[0035] Specifically, the first drive branch chain includes a drive source 30 installed on the detection base 1. The drive source 30 is composed of a drive motor and a reducer. A transmission shaft 31 is provided at the power output end of the drive source 30. The transmission shaft 31 includes a threaded section 310 and a non-threaded section 311. A transmission block 32 is screwed on the threaded section 310. A third elastic member is provided between the transmission block 32 and the detection base 1 along the axial direction of the transmission shaft 31. When the transmission block 32 is in the non-threaded section 311, based on the elastic force of the third elastic member, the transmission block 32 has a tendency to always be screwed with the threaded section 310. The transmission block 32 is connected to each set of clamping plate groups 2 through a transmission connecting rod 33 Next, a track 34 is further provided on the detection base 1, and two slides 35 are slidingly provided in the track 34. The two sets of clamping plate groups 2 correspond to the two slides 35 one by one, and the corresponding clamping plate groups 2 are fixedly connected to the slides 35. That is, when the two sets of clamping plates 20 need to approach each other, the driving source 30 drives the transmission shaft 31 to rotate, and the rotation of the transmission shaft 31 drives the transmission block 32 to move from the threaded section 310 toward the non-threaded section 311. The transmission block 32 drives the two sets of clamping plate groups 2 to approach each other through two transmission connecting rods 33 (based on the cooperation of the two slides 35 and the track 34, a guiding effect is provided for the two sets of clamping plate groups 2 to approach each other).

[0036] Based on the above, the travel of the transmission block 32 before reaching the non-threaded section 311 can be used to enable the two sets of clamping plate groups 2 to clamp the two ends of the geotextile 6 in the length direction, that is, the second drive branch chain includes a conical surface 36 at each axial end of each clamping plate 20 in each set of clamping plate groups 2, and an extrusion ring 37 is respectively sleeved on the axial ends of each set of clamping plate groups 2. When the two extrusion rings 37 are acted upon by external force and approach each other, an extrusion action is formed between the conical surface 36 through wedge-shaped cooperation. This extrusion action causes the two clamping plates 20 to approach each other to clamp the geotextile 6, that is, each extrusion block 47 is fixedly connected to a first rack 38, and the teeth of the two first racks 38 corresponding to the two extrusion blocks 47 are arranged relative to each other, and a second shaft rod 39 is rotatably provided on the clamping plate group 2, and a first gear 40 is installed at one end of the second shaft rod 39. The first gear 40 is meshed with the two first racks 38, and the second shaft rod 39 is meshed with the two first racks 38. A second gear 41 is installed at the other end, and two second frames 42 are also slidably provided on the track 34. The two second frames 42 correspond one to one with the two sets of clamping plate groups 2. A fourth elastic member is provided between the second frame 42 and the detection base 1. Based on the elastic force of the fourth elastic member, the two second frames 42 tend to always move away from each other. A second rack 43 is provided on each second frame 42, and the second gear 41 is meshed with the second rack 43. In this way, in the process of the first drive branch chain driving the two sets of clamping plate groups 2 to approach each other, the cooperation between the second gear 41 and the second rack 43 drives the first gear 40 to rotate through the second shaft 39. The rotation of the first gear 40 causes the two second racks 43 to move relative to each other, driving the two extrusion rings 37 to approach each other. The extrusion ring 37 will form an extrusion action with the conical surface 36 through wedge cooperation. The extrusion action causes the two clamping plates 20 to approach each other to clamp the geotextile 6.

[0037] After the transmission block 32 reaches the non-threaded section 311, the clamping plate group 2 needs to rotate to wind the geotextile 6, that is, the third drive branch chain includes a third gear 44 fixed on the transmission shaft 31, and a fourth gear 45 fixed on each set of clamping plate groups 2. The third gear 44 is engaged with the two fourth gears 45. After the gear transmission, the two sets of clamping plate groups 2 will rotate to reel in the clamped geotextile 6. After the geotextile 6 is wound 2 to 5 times on each set of clamping plate groups 2, the reserved length in the middle can be used for tensile testing. After that, the two sets of clamping plate groups 2 continue to rotate, and the geotextile 6 will be stretched.

[0038] When the two clamping plates 20 can no longer approach each other, the two sets of clamping plate groups 2 continue to approach each other, and the second gear 41 cannot rotate, and it will drive the second rack 43 to move together, so that the elastic force of the fourth elastic member will also increase. By utilizing the elastic force of the fourth elastic member, the second rack 43 has a tendency to always drive the second gear 41 to rotate, that is, in the subsequent tensile test of the geotextile 6, as the geotextile 6 is subjected to tension, the geotextile 6 rolled up on the clamping plate group 2 will also gradually be stretched and tightened, and the two clamping plates 20 can approach each other again, and then by utilizing the elastic force of the fourth elastic member, during the tensile test of the geotextile 6, each set of clamping plate groups 2 can increase the clamping force on the geotextile 6 in real time.

[0039] In an optional embodiment, in order to avoid the situation of tooth collision when the fourth gear 45 is meshed with the third gear 44, a third shaft 46 is axially slidably arranged in the transmission shaft 31. An extrusion block 47 is installed at one end of the third shaft 46 close to the third gear 44. A fifth elastic member is provided between the extrusion block 47 and the transmission shaft 31. A pressure ring 48 is installed at the other end. A friction block 49 is radially slidably arranged at the end portion where the transmission shaft 31 is connected to the third gear 44. Based on the elastic force of the fifth elastic member, the pressure ring 48 There is a tendency to approach the junction of the threaded section 310 and the non-threaded section 311, that is, when the pressure ring 48 is not subjected to external force, the extrusion block 47 squeezes the friction block 49, so that the friction block 49 and the third gear 44 are out of radial friction contact, so that it is difficult to transmit power between the transmission shaft 31 and the third gear 44. During the meshing process of the fourth gear 45 and the third gear 44, there is basically no tooth collision between the two. In the process of the transmission block 32 entering the non-threaded section 311, it squeezes the pressure ring 48. The pressure ring 48 drives the extrusion block 47 to squeeze the friction block 49 through the third shaft 46, so that the friction block 49 moves radially and contacts the third gear 44 with friction, so that the transmission shaft 31 can drive the third gear 44 to rotate. There is a stroke from the engagement to the complete engagement of the fourth gear 45 and the third gear 44. Therefore, in the stroke from the initial engagement to the half engagement of the fourth gear 45 and the third gear 44, the transmission block 32 has not yet completely disengaged from the threaded section 310, that is, the transmission block 32 has not yet squeezed the pressure ring 48. When the fourth gear 45 is halfway engaged with the third gear 44, the transmission block 32 begins to squeeze the pressure ring 48 and gradually disengages from the threaded section 310 and enters the non-threaded section 311 until the extrusion block 47 is completely disengaged from the threaded section 310. The friction between the friction block 49 and the third gear 44 reaches its maximum. At this time, the transmission shaft 31 can drive the third gear 44 to rotate together, and the friction force between the friction block 49 and the third gear 44 is greater than the maximum tensile force required to break the geotextile 6 during the tensile test.

[0040] The extrusion block 47 will squeeze the friction block 49 during the axial reciprocating movement, and the friction block 49 can slide radially, that is, the extrusion block 47 includes a first extrusion surface 50, and the friction block 49 includes a first pressure surface 51. When the pressure ring 48 is squeezed by the transmission block 32, the first extrusion surface 50 squeezes the first pressure surface 51 (the wedge-shaped fit between the two forms an extrusion action), so that the friction block 49 radially approaches the third gear 44. The extrusion block 47 is also provided with a second extrusion surface 52, and the friction block 49 is also provided with a second pressure surface 53. Under the action of the rebound force of the fifth elastic member, the second extrusion surface 52 squeezes the second pressure surface 53, so that the friction block 49 radially moves away from the third gear 44. The first pressure surface 51 is farther away from the central axis of the transmission shaft 31 than the second pressure surface 53. Therefore, during the axial reciprocating movement of the extrusion block 47, it can produce an extrusion effect on the friction block 49 in the opposite direction.

[0041] Preferably, each set of the clamping plate group 2 includes a first frame 21 and two first shafts 22 rotatably arranged on the first frame 21. Two clamping plates 20 are radially slidingly arranged between the two first shafts 22, and in the sliding direction, a first elastic member is connected between each clamping plate 20 and each first shaft 22. Based on the elastic force of the first elastic member, the two clamping plates 20 tend to move away from each other.

[0042] Specifically, the two first frames 21 correspond to the two slides 35 one by one, and the corresponding first frames 21 are fixedly connected to the slides 35. In the width direction of the geotextile 6, a first shaft 22 is rotatably arranged at each end of the first frame 21. A slide groove 23 is provided at both ends of each clamping plate 20. A slider 24 is slidably installed in the slide groove 23, and the sliding direction of the slider 24 is the direction of relative movement of the two clamping plates 20. A first elastic member is provided between the slider 24 and the clamping plate 20. The first shaft 22 is fixedly connected to the two sliders 24 at the corresponding positions. , and based on the elastic force of the first elastic member, the two clamping plates 20 tend to move away from each other, that is, when there is no external force, there is space between the two clamping plates 20 for the length end of the geotextile 6 to be inserted, and the two fourth gears 45 are installed on the two first shafts 22, the two first shafts 22 do not belong to the same set of clamping plate groups 2, and the two correspond to each other in the directions of relative movement of the two sets of clamping plate groups 2, the first rack 38 is slidably mounted on the first frame 21, and the second shaft 39 is also rotatably mounted on the first frame 21.

[0043] Furthermore, a rod body 25 is slidingly provided on the first frame body 21, and in the sliding direction, a second elastic member is provided between the rod body 25 and the first frame body 21, and an extrusion plate 26 is provided at one end of the transmission rod body facing the clamping plate 20. Based on the elastic force of the second elastic member, the extrusion plate 26 tends to stick to the corresponding clamping plate 20.

[0044] Specifically, after the two sets of clamping plate groups 2 respectively clamp the two ends of the geotextile 6 in the length direction, the third drive branch chain will drive the two sets of clamping plate groups 2 to rotate and start to roll up the geotextile 6. In the process of the two sets of clamping plates 20 approaching each other and not starting to roll up the geotextile 6, the geotextile 6 in the middle position of the two sets of clamping plate groups 2 will become loose and wrinkled. Then, when rolling up, the tightness of the rolling will be very low. In the subsequent tensile test, the rolled part of the geotextile 6 will also have too much deformation, resulting in an increase in the test time. Therefore, in this embodiment, a rod body 25 is slidably arranged on the first frame 21, and an extrusion plate 26 is installed on the rod body 25. The elastic force of the second elastic member is used to make the extrusion plate 26 stick to its corresponding clamping plate 20. Then, in the process of the geotextile 6 being rolled up, the clamping plate 20 will first squeeze the geotextile 6, so that the rolled geotextile 6 will not deform much in the subsequent tensile test.

[0045] In an optional embodiment, the second elastic member is replaced, that is, a non-pressurized surface 420 and a pressurized surface 421 are provided on the second frame 42, which are in sliding contact with the end of the rod body 25 away from the extrusion plate 26. That is, when the two sets of clamping plate groups 2 approach each other to clamp the end of the geotextile 6, the rod body 25 slides in contact with the non-pressurized surface 420. In the process of the clamping plate group 2 rolling up the geotextile 6, the rod body 25 begins to slide in contact with the pressurized surface 421, and the pressurized surface 421 is inclined. Along the direction in which the two sets of clamping plate groups 2 approach each other, the stronger the extrusion effect of the pressurized surface 421 on the rod body 25, as the number of layers of geotextile 6 wound on the clamping plate group 2 increases, the extrusion force of the extrusion plate 26 on the geotextile 6 becomes greater and greater, thereby reducing more deformation when the geotextile 6 is subjected to a tensile test.

[0046] Preferably, the cross-section of the clamping plate 20 is a semicircular structure, and a rubber sleeve 27 is provided on the clamping plate 20; specifically, the cross-section of the clamping plate 20 is a semicircular structure, so that the geotextile 6 is evenly stressed, and the rubber sleeve 27 plays an anti-slip role, that is, when the geotextile 6 is initially rolled up, under the squeezing action of the squeezing plate 26, the geotextile 6 also has a tendency to be pulled off from between the two clamping plates 20, and the rubber sleeve 27 can increase the friction force and effectively prevent the above situation from occurring. In an optional embodiment, the surface of the rubber sleeve 27 between the two clamping plates 20 can be provided with lines parallel to the axial direction, and the lines on the corresponding two rubber sleeves 27 are arranged alternately, so as to better increase the friction strength.

[0047] Furthermore, the thickness of the rubber sleeve 27 located between the two clamping plates 20 gradually increases axially toward both ends with the middle as the dividing line; specifically, when the clamped portion of the geotextile 6 is subjected to external tensile force, the corners are more likely to fall off. Therefore, in this embodiment, the thickness of the rubber sleeve located between the two clamping plates 20 gradually increases axially toward both ends with the middle as the dividing line, that is, under the same clamping force, the pressure on the corners of the geotextile 6 is greater.

[0048] Furthermore, a retaining groove 28 is provided on the first frame 21. When the end of the geotextile 6 in the length direction is placed between the two clamping plates 20, the end of the geotextile 6 in the length direction passes through the space between the two clamping plates 20 and rests on the wall of the retaining groove 28.

[0049] Specifically, in order to increase the interaction force between the layers of the rolled-up geotextile 6, in this embodiment, when the end of the geotextile 6 in the length direction is placed between the two clamping plates 20, the end of the geotextile 6 in the length direction passes through the space between the two clamping plates 20 and rests on the wall of the retaining groove 28. In this way, during the rolling process of the geotextile 6, the end of the geotextile 6 will also be pressed by the outer layer.

[0050] Preferably, the two first shafts 22 corresponding to the first frame 21 limit the two sides of the geotextile 6 in the width direction respectively; specifically, according to the width of the geotextile 6, the distance between the two first shafts 22 is basically consistent with the width of the geotextile 6, so that when the two sets of clamping plate groups 2 approach each other, the part of the geotextile 6 between the two clamping plates 20 will not be wrinkled, thereby better clamping.

[0051] Preferably, the two first shafts 22 corresponding to the first frame 21, one first shaft 22 is connected to the first drive branch chain, and the other first shaft 22 is provided with a ball 54, and a rolling groove 55 for the ball 54 to roll is provided on the detection base 1, and the rolling direction of the ball 54 in the rolling groove 55 is parallel to the relative movement direction of the two first frames 21; specifically, the cooperation between the ball 54 and the rolling groove 55 plus the cooperation between the track 34 and the slide 35 ensure the stability of the two sets of clamping plate groups 2 during movement.

[0052] The above descriptions of certain exemplary embodiments of the present invention are provided by way of illustration only. It is understood that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the present invention.

Claims

1. A geotextile tensile strength testing device, comprising a testing base, a force-applying assembly and two sets of clamping plates provided on the testing base, wherein the two sets of clamping plates stretch the clamped geotextile based on the driving force of the force-applying assembly, characterized in that: The two sets of clamping plate groups are rotatably arranged on the force-applying assembly. Based on the driving action of the force-applying assembly, the two sets of clamping plate groups have the following strokes: in the first stroke, the two sets of clamping plate groups clamp the two ends of the geotextile in the stretching direction respectively; In the second stroke, both sets of clamping plates rotate and roll up the two ends of the geotextile respectively; The force-applying assembly includes: a first drive branch chain, which is used to drive the two sets of clamping plate groups to move relative to each other; a second drive branch chain, which, based on the power of the first drive branch chain, drives the two sets of clamping plate groups to clamp the two ends of the geotextile in the length direction; a third drive branch chain, which, based on the power of the first drive branch chain, drives the two sets of clamping plate groups to rotate relative to each other; The first drive branch chain includes a drive source installed on the detection base, the drive source consists of a drive motor and a reducer, a power output end of the drive source is provided with a transmission shaft, the transmission shaft includes a threaded section and a non-threaded section, a transmission block is screwed on the threaded section, and a third elastic member is provided between the transmission block and the detection base along the axial direction of the transmission shaft; when the transmission block is in the non-threaded section, based on the elastic force of the third elastic member, the transmission block has a tendency to always be screwed with the threaded section, the transmission block and each set of clamping plate groups are connected by a transmission connecting rod, and a track is further provided on the detection base, two slides are slidingly provided in the track, the two sets of clamping plate groups correspond to the two slides one by one, and the corresponding clamping plate groups are fixedly connected to the slides; The second drive branch chain includes a tapered surface provided at each axial end of each clamping plate in each set of clamping plate groups, and an extrusion ring is provided at each axial end of each clamping plate group. When the two extrusion rings are brought closer to each other under the action of external force, an extrusion action is formed between the tapered surface through a wedge-shaped fit; The extrusion blocks are fixedly connected with a first rack, and the teeth of the two first racks corresponding to the two extrusion blocks are arranged opposite to each other, and a second shaft is rotatably provided on the clamping plate group, and one end of the second shaft is installed with a first gear, and the first gear is meshed with the two first racks, and the other end of the second shaft is installed with a second gear. Two second frames are also slidably provided on the track, and the two second frames correspond to the two sets of clamping plate groups one by one. A fourth elastic member is provided between the second frame and the detection base. Based on the elastic force of the fourth elastic member, the two second frames have a tendency to always move away from each other, and a second rack is provided on each second frame, and the second gear is meshed with the second rack; The third drive branch chain includes a third gear fixed on the transmission shaft and a fourth gear fixed on each set of clamping plate groups. The third gear is meshed with the two fourth gears.

2. The geotextile tensile strength testing device according to claim 1, characterized in that: Each set of the clamping plate group includes a first frame and two first shafts rotatably arranged on the first frame. Two clamping plates are radially slidingly arranged between the two first shafts, and in the sliding direction, a first elastic member is connected between each clamping plate and each first shaft. Based on the elastic force of the first elastic member, the two clamping plates tend to move away from each other.

3. The geotextile tensile strength testing device according to claim 2, characterized in that: A rod body is slidably provided on the first frame, and in the sliding direction, a second elastic member is provided between the rod body and the first frame, and an extrusion plate is provided at one end of the transmission rod body facing the clamping plate. Based on the elastic force of the second elastic member, the extrusion plate tends to stick to the corresponding clamping plate.

4. The geotextile tensile strength testing device according to claim 3, characterized in that: The cross section of the clamping plate is a semicircular structure, and a rubber sleeve is sleeved on the clamping plate.

5. The geotextile tensile strength testing device according to claim 4, characterized in that: The surface of the rubber sleeve located between the two clamping plates is provided with lines parallel to the axial direction, and the lines on the two corresponding rubber sleeves are arranged alternately.

6. The geotextile tensile strength testing device according to claim 4, characterized in that: The thickness of the portion of the rubber sleeve located between the two clamping plates gradually increases axially toward both ends with the middle as the dividing line.

7. The geotextile tensile strength testing device according to claim 6, characterized in that: A retaining groove is provided on the first frame. When the end of the geotextile in the length direction is placed between the two clamping plates, the end of the geotextile in the length direction passes through the space between the two clamping plates and rests on the retaining groove wall.

8. The geotextile tensile strength testing device according to claim 2, characterized in that: The two first shafts corresponding to the first frame respectively limit the two sides of the geotextile in the width direction.

9. The geotextile tensile strength testing device according to claim 2, characterized in that: The first frame corresponds to two first shafts, one first shaft is connected to the first drive branch chain, and the other first shaft is provided with a ball, and a rolling groove for the ball to roll is provided on the detection base, and the rolling direction of the ball in the rolling groove is parallel to the relative movement direction of the two first frames.

Images