A geotextile water retention curve measuring device

Abstract

The present application relates to the field of geotextile moisture characteristic curve measurement, and discloses a geotextile moisture characteristic curve measurement device, which comprises a fixed box, a length adjustment box body and a test box which are connected in sequence and slide in nest, the fixed box, the length adjustment box body and the test box are communicated in sequence to allow a to-be-measured member to pass through in sequence, the fixed box is provided with a placing entrance for placing the to-be-measured member, and the test box is provided with a through opening which is communicated with the outside; a clamping mechanism is arranged on the fixed box and used for clamping or releasing one end of the to-be-measured member; a cutting mechanism for cutting the to-be-measured member is slidably arranged on the length adjustment box body in a direction perpendicular to the height direction of the length adjustment box body; a first linear driving mechanism is connected between the fixed box and the length adjustment box body and used for adjusting the distance between the fixed box and the length adjustment box body; and a second linear driving mechanism is connected between the length adjustment box body and the test box and used for adjusting the distance between the length adjustment box body and the test box. The device can more efficiently measure the moisture characteristic curve of the geotextile.

Description

Technical Field

[0001] This invention relates to the field of geotextile moisture characteristic curve measurement, and in particular to a geotextile moisture characteristic curve measurement device. Background Technology

[0002] With the continuous improvement and development of my country's transportation system, delaying roadbed damage and extending its service life have become increasingly important. In areas with high rainfall and cold, frozen soil, roadbeds are susceptible to water intrusion due to groundwater levels, leading to seepage and frost damage. Furthermore, the physical and mechanical properties of the soil change, resulting in a decrease in roadbed strength. Geotextiles, traditionally used for roadbed reinforcement, also possess excellent drainage properties, reducing the moisture content of the roadbed and thus extending its service life and maintaining its strength.

[0003] However, geotextiles of different types and materials may exhibit significant differences in water absorption performance. To determine the quality of geotextile water absorption, it is necessary to measure its moisture characteristic curve. In the laboratory, the moisture characteristic curve is primarily determined through a geotextile capillary rise test, requiring a control group to be included in the test. First, the geotextile is hung horizontally on a support with its lower part immersed in water. After the geotextile has absorbed water, it is removed, a fixed length is manually measured, and then it is cut with scissors. The cut geotextile segments are placed in a pre-weighed container and weighed together. Then, they are placed in a drying oven. After drying, they are removed and weighed again to obtain the moisture content of the geotextile segments, thus yielding the geotextile's horizontal characteristic curve. In current experimental procedures, to prevent the geotextile from evaporating after absorbing water and affecting the accuracy of the test, it is necessary to wrap the geotextile with plastic wrap for sealing, which further reduces efficiency.

[0004] Therefore, a more efficient device is needed to measure the moisture characteristic curve of geotextiles using the capillary rise method. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a geotextile moisture characteristic curve measuring device that can more efficiently realize the capillary rise method for measuring the moisture characteristic curve of geotextile.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a device for measuring the moisture characteristic curve of geotextile, comprising:

[0008] A fixed box, a length adjustment box, and a test box are sequentially slidably nested together. The fixed box, the length adjustment box, and the test box are connected in sequence so that the test piece can pass through in sequence. The fixed box is provided with an inlet for the test piece to be placed, and the test box is provided with a through opening that communicates with the outside.

[0009] A clamping mechanism is provided on the fixing box and is used to clamp or release one end of the test piece;

[0010] The cutting mechanism for cutting the test piece is slidably mounted on the length adjustment box in a direction perpendicular to the height of the length adjustment box.

[0011] A first linear drive mechanism connects the fixed box and the length adjustment box and is used to adjust the distance between the two.

[0012] The second linear drive mechanism connects the length adjustment box and the test box and is used to adjust the distance between them.

[0013] Optionally, the geotextile moisture characteristic curve measuring device further includes a third linear drive mechanism. The number of length adjustment boxes is at least two, and any two adjacent length adjustment boxes are connected by the third linear drive mechanism. The third linear drive mechanism is used to adjust the distance between two adjacent length adjustment boxes.

[0014] Optionally, the length adjustment box body includes a cutting box and an intermediate connecting box that are connected to each other;

[0015] The cutting box closest to the fixed box is slidably nested with the fixed box and connected to it, and the two are connected by a first linear drive mechanism;

[0016] The intermediate connecting box of the length adjustment box closest to the test box is slidably nested and connected to the fixed box, and the two are connected by a second linear drive mechanism;

[0017] The intermediate connecting box of any two adjacent length adjustment boxes is slidably nested and connected to the cutting box of the other, and the two are connected by a third linear drive mechanism.

[0018] Each of the cutting boxes is provided with the cutting mechanism.

[0019] Optionally, the first linear drive mechanism includes a first screw and a first mounting sleeve. The cutting box closest to the length adjustment box body of the fixed box is provided with a first mounting hole. The first mounting sleeve is rotatably disposed in the first mounting hole and is axially positioned. The first screw is fixedly connected to the fixed box, and one end of the first screw is disposed in the first mounting sleeve and threadedly connected to the inner wall of the first mounting sleeve.

[0020] The second linear drive mechanism includes a second screw and a second mounting sleeve. The test box is provided with a second mounting hole. The second mounting sleeve is rotatably disposed in the second mounting hole and is axially positioned. The second screw is disposed on the intermediate connecting box of the length adjustment box body closest to the test box. One end of the second screw is disposed in the second mounting sleeve and is threadedly connected to the inner wall of the second mounting sleeve.

[0021] The third linear drive mechanism includes a third screw and a third mounting sleeve. The cutting box is provided with a third mounting hole. The third mounting sleeve is rotatably disposed in the third mounting hole and is axially positioned. The third screw is disposed on the intermediate connecting box. One end of the third screw is disposed in the third mounting sleeve and is threadedly connected to the inner wall of the third mounting sleeve.

[0022] Optionally, the fixing box is open at one end near the length adjustment box body, and the cutting box closest to the fixing box body is provided with a first recess that matches the shape of the fixing box. The fixing box is disposed in the first recess at one end near the length adjustment box body and is slidably connected to the first recess.

[0023] The cutting box is open at one end away from the intermediate connecting box to enable communication between the cutting box closest to the fixed box and the fixed box, as well as communication between adjacent cutting boxes and the intermediate connecting box.

[0024] Both ends of the intermediate connecting box are open to enable communication between the intermediate connecting box closest to the test box and the test box, as well as between adjacent intermediate connecting boxes and the cutting box.

[0025] The test box is provided with a second recess that matches the shape of the intermediate connecting box closest to the test box. One end of the intermediate connecting box closest to the test box is disposed in the second recess and is slidably connected to the second recess.

[0026] The remaining length adjustment box body has a third recessed cavity on the cutting box that matches the shape of the intermediate connecting box. The end of the intermediate connecting box near the cutting box is located in the third recessed cavity and is slidably connected to the third recessed cavity.

[0027] Optionally, the intermediate connecting box and the cutting box of the same intermediate connecting box body, one of them is provided with a recess that matches the other, the other is partially disposed in the recess, and the two are detachably connected.

[0028] Optionally, the cutting mechanism includes a cutting blade and a driving mechanism. The cutting blade is used to cut the workpiece to be tested. The cutting box has a communication port for connecting to the intermediate connecting box at one end near the intermediate connecting box. A mounting groove is provided on the side wall of the communication port. The cutting blade is slidably connected to the mounting groove. The driving mechanism is disposed on the cutting box and is used to drive the cutting blade to move toward or away from the workpiece to be tested.

[0029] Optionally, the geotextile moisture characteristic curve measuring device further includes an intermediate connector. The driving mechanism is a manual driving mechanism, which is located outside the cutting box. A guide groove is provided on the side wall of the cutting box. The length direction of the guide groove is parallel to the length direction of the mounting groove. The driving mechanism is connected to the cutting blade through the intermediate connector, and the intermediate connector is slidably connected to the guide groove.

[0030] Optionally, the clamping mechanism includes two clamping plates, the insertion port is located at one end of the fixing box away from the length adjustment box, two sliding grooves are provided opposite to each other on the two side walls of the insertion port, the two clamping plates are slidably disposed in the two sliding grooves, the two clamping plates are detachably connected, and one end of the test piece can be clamped between the two clamping plates.

[0031] Optionally, a first scale line is provided on the outer wall of the fixing box along the height direction of the fixing box, and a second scale line is provided on the outer wall of the length adjustment box along the height direction of the length adjustment box.

[0032] The present invention achieves the following technical effects compared to the prior art:

[0033] The geotextile moisture characteristic curve measuring device provided by the present invention includes: a fixed box, a length adjustment box, and a test box that are sequentially slidably nested together, the fixed box, the length adjustment box, and the test box being connected in sequence for the test piece to pass through sequentially; the fixed box having an inlet for placing the test piece, and the test box having a through opening communicating with the outside; a clamping mechanism disposed on the fixed box for clamping or releasing one end of the test piece; a cutting mechanism disposed on the length adjustment box for cutting the test piece; a first linear drive mechanism connecting the fixed box and the length adjustment box for adjusting the distance between them; and a second linear drive mechanism connecting the length adjustment box and the test box for adjusting the distance between them.

[0034] Before the test, the test specimen, such as geotextile, is inserted into the test box through the fixing box and the length adjustment box. One end of the specimen is fixed using a clamping mechanism, suspending it vertically within the device. The cutting mechanism is then adjusted to align with the cut position of the specimen. During the test, the entire device is immersed in a container of water, ideally with the water level above half the test box. Water enters the test box through the opening, wetting the bottom of the specimen and rising along it. Once the specimen has absorbed the water, the capillary rise test is complete. After the test, the cutting device is moved perpendicular to the height of the length adjustment box to cut the specimen at the preset position. As can be seen, the entire experimental process is conducted inside the device, which is a relatively sealed box, eliminating the need for wrapping with plastic wrap to prevent moisture evaporation. Thus, the geotextile moisture characteristic curve measurement device provided by this invention can more efficiently measure the moisture characteristic curve of geotextile using the capillary rise method. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a first perspective view of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0037] Figure 2 for Figure 1 The main view;

[0038] Figure 3 This is a second perspective view of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the fixing box of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the first angle of the intermediate connecting box of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0041] Figure 6 This is a second-angle schematic diagram of the intermediate connecting box of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0042] Figure 7 This is a perspective view of the cutting box of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0043] Figure 8 This is a partial cross-sectional view of the cutting box of the geotextile moisture characteristic curve measuring device provided in this embodiment of the invention.

[0044] Figure 9 This is a schematic diagram of the structure of the first mounting sleeve of the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0045] Figure 10 This is a schematic diagram of the structure of the test box for the geotextile moisture characteristic curve measuring device provided in an embodiment of the present invention.

[0046] Figures 1-10 Explanation of reference numerals in the attached drawings: 1. Fixing box; 101. First protrusion; 2. Intermediate connecting box; 201. Second protrusion; 3. Cutting box; 301. First mounting hole; 302. Guide groove; 303. Connecting opening; 304. Recess; 305. First cavity; 4. Test box; 401. Second mounting hole; 402. Through opening; 5. First screw; 6. Second screw; 7. Third screw; 8. First scale line; 9. Second scale line; 10. Clamping plate; 11. First mounting sleeve; 1101. First flange; 12. Cutting blade; 13. Fastener; 14. Drive mechanism; 15. Bolt. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The purpose of this invention is to provide a geotextile moisture characteristic curve measuring device that can more efficiently realize the capillary rise method for measuring the moisture characteristic curve of geotextile.

[0049] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] refer to Figures 1-10 As shown, this embodiment of the invention provides a geotextile moisture characteristic curve measuring device, which enables more efficient measurement of the geotextile moisture characteristic curve using the capillary rise method. The geotextile moisture characteristic curve measuring device includes: a fixing box 1, a length adjustment box, a test box 4, a clamping mechanism, a cutting mechanism, a first linear drive mechanism, and a second linear drive mechanism.

[0051] Specifically, the fixing box 1, the length adjustment box, and the test box 4 are all box structures. These three components are sequentially slidably nested together, allowing the test piece to pass through them sequentially. The nesting ensures that the connection points of the devices partially overlap, creating a relatively enclosed environment. The fixing box 1 has an inlet for placing the test piece, and the test box 4 has a through-hole 402 connecting to the outside. For example, the through-hole 402 is located at the end of the test box 4 furthest from the length adjustment box. A clamping mechanism is mounted on the fixed box 1 and is used to clamp or release one end of the test piece. A cutting mechanism is used to cut the test piece. The cutting mechanism is slidably mounted on the length adjustment box along the direction perpendicular to the height of the length adjustment box. A first linear drive mechanism connects the fixed box 1 and the length adjustment box and is used to adjust the distance between them. A second linear drive mechanism connects the length adjustment box and the test box 4 and is used to adjust the distance between them. The position of the length adjustment box can be adjusted by the first linear drive mechanism and the second linear drive mechanism, which in turn can adjust the position of the cutting mechanism so that the cutting mechanism is relative to the position to be cut.

[0052] Before the test, the test piece, such as geotextile, is inserted into the test box 4 through the fixing box 1 and the length adjustment box. One end of the test piece is fixed using the clamping mechanism, suspending it vertically within the device. The position of the cutting mechanism is adjusted so that it aligns with the cut position of the test piece. During the test, the entire device is immersed in a container of water, ideally with the water level above half of the test box 4. Water enters the test box 4 through the through-hole 402, wetting the bottom of the test piece and rising along it. Once the test piece has absorbed the water, the capillary rise test is complete. After the test, the cutting device is moved perpendicular to the height of the length adjustment box to cut the test piece at the preset position. As can be seen, the entire experimental process is conducted inside the device, which is a relatively sealed box, eliminating the need for wrapping with plastic wrap to prevent moisture evaporation. Thus, the geotextile moisture characteristic curve measuring device provided by the present invention can more efficiently complete the capillary rise method for measuring the moisture characteristic curve of geotextile.

[0053] It should be noted that the geotextile moisture characteristic curve measuring device provided by the present invention is suitable for any structure that can use the capillary rise method to measure the moisture characteristic curve, and geotextile is just one of them.

[0054] In another embodiment of the present invention, as Figures 1-3As shown, the geotextile moisture characteristic curve measuring device also includes a third linear drive mechanism. The number of length adjustment boxes is at least two, and any two adjacent length adjustment boxes are connected by the third linear drive mechanism, which is used to adjust the distance between adjacent length adjustment boxes. The exact number of length adjustment boxes depends on the cutting requirements of the test piece. Each length adjustment box has a cutting mechanism that can be slidably installed along a direction perpendicular to its height. After the test piece is vertically suspended inside the device, the cutting mechanism is perpendicular to the test piece, and each cutting mechanism corresponds to a cutting position on the test piece. By providing at least two length adjustment boxes, the geotextile moisture characteristic curve measuring device provided by this invention can adapt to test pieces of different lengths and cutting requirements, thus offering wider applicability.

[0055] In actual use, after the test is completed, when performing the cutting operation, operate each cutting mechanism in sequence from bottom to top, that is, from the test box 4 to the fixed box 1, so as to achieve the sequential cutting of the test piece.

[0056] Furthermore, the length adjustment box includes a cutting box 3 and an intermediate connecting box 2 that are connected and communicate with each other. The cutting box 3, which is closest to the fixed box 1, is slidably nested and connected to the fixed box 1, and the two are connected by a first linear drive mechanism. The intermediate connecting box 2, which is closest to the test box 4, is slidably nested and connected to the fixed box 1, and the two are connected by a second linear drive mechanism. The intermediate connecting box 2 of any two adjacent length adjustment boxes is slidably nested and connected to the cutting box 3 of the other box, and the two are connected by a third linear drive mechanism. Each cutting box 3 is provided with a cutting mechanism.

[0057] As an alternative implementation method, refer to Figure 1 , Figure 7 and Figure 8As shown, the first linear drive mechanism includes a first screw 5 and a first mounting sleeve 11. A first mounting hole 301 is provided on the cutting box 3 closest to the length adjustment box body of the fixed box 1. The first mounting sleeve 11 is rotatably disposed within the first mounting hole 301. The first mounting sleeve 11 is axially positioned, meaning it can only rotate around its own axis and cannot move along its own axis. How the axial positioning of the first mounting sleeve 11 is specifically achieved is prior art and not the focus of this invention, therefore it will not be described further here. The first screw 5 is fixedly connected to the fixed box 1, and one end of the first screw 5 is disposed within the first mounting sleeve 11 and threadedly connected to the inner wall of the first mounting sleeve 11. In actual use, rotating the first mounting sleeve 11 causes the first screw 5 to move along its own axis, thereby achieving relative movement between the fixed box 1 and the cutting box 3.

[0058] The second linear drive mechanism includes a second screw 6 and a second mounting sleeve. The test box 4 has a second mounting hole 401, and the second mounting sleeve is rotatably mounted within the second mounting hole 401, providing axial positioning. The second screw 6 is mounted on the intermediate connecting box 2 closest to the length adjustment box body of the test box 4. One end of the second screw 6 is located inside the second mounting sleeve and threadedly connected to the inner wall of the second mounting sleeve. In actual use, rotating the second mounting sleeve causes the second screw 6 to move along its own axis, thereby achieving relative movement between the test box 4 and the length adjustment box body closest to the test box 4.

[0059] The third linear drive mechanism includes a third screw 7 and a third mounting sleeve. The cutting box 3 has a third mounting hole, and the third mounting sleeve is rotatably mounted within this hole, providing axial positioning. The third screw 7 is mounted on the intermediate connecting box 2, with one end of the screw 7 inserted into the third mounting sleeve and threadedly connected to its inner wall. In practical use, rotating the third mounting sleeve causes the third screw 7 to move along its own axis, thereby adjusting the distance between adjacent length adjustment boxes.

[0060] As an alternative implementation method, refer to Figure 9 As shown, the first mounting sleeve 11 is provided with a first flange 1101, which is supported on the cutting box 3 closest to the fixed box 1. The second mounting sleeve is provided with a second flange, which is supported on the test box 4. The third mounting sleeve is provided with a third flange, which is supported on the cutting box 3 of one of the two adjacent length adjustment boxes.

[0061] Additionally, in other embodiments, for ease of connection with the first screw 5, such as... Figure 4 As shown, the fixing box 1 is provided with a first protrusion 101, which is for easy connection with the second screw 6 and the third screw 7, as follows: Figure 5 and Figure 6 As shown, a second protrusion 201 is provided on the intermediate connecting box 2.

[0062] As an optional implementation, the fixing box 1 is open at one end near the length adjustment box body, such as... Figure 7 As shown, the cutting box 3 closest to the length adjustment box body of the fixing box 1 is provided with a first recess 305 that matches the shape of the fixing box 1. The end of the fixing box 1 closest to the length adjustment box body is disposed in the first recess 305 and is slidably connected to the first recess 305.

[0063] refer to Figure 7 and Figure 8 As shown, the end of the cutting box 3 away from the intermediate connecting box 2 is open to enable communication between the cutting box 3, which is closest to the length adjustment box of the fixed box 1, and the fixed box 1, as well as between adjacent cutting boxes 3 and the intermediate connecting box 2.

[0064] like Figure 5 and Figure 6 As shown, both ends of the intermediate connecting box 2 are open to enable communication between the intermediate connecting box 2, which is closest to the length adjustment box of the test box 4, and the test box 4, as well as between the adjacent intermediate connecting box 2 and the cutting box 3.

[0065] like Figure 10 As shown, the test box 4 is provided with a second cavity that matches the shape of the intermediate connecting box 2 closest to the test box 4. One end of the intermediate connecting box 2 closest to the test box 4 is disposed in the second cavity and is slidably connected to the second cavity.

[0066] The remaining length adjustment box body has a third recessed cavity on the cutting box 3 that matches the shape of the intermediate connecting box 2. The end of the intermediate connecting box 2 near the cutting box 3 is located in the third recessed cavity and is slidably connected to the third recessed cavity.

[0067] As an optional implementation, the intermediate connecting box 2 and the cutting box 3 of the same intermediate connecting box 2 body are provided with a recess 304 that matches the other, and the other part is partially disposed in the recess 304, and the two are detachably connected. Further, the intermediate connecting box 2 and the cutting box 3 of the same intermediate connecting box 2 body are connected, for example, by a snap-fit ​​connection.

[0068] More specifically, such as Figure 8As shown, the cutting box 3 has a recess 304 that matches the shape of the intermediate connecting box 2. The intermediate connecting box 2 is partially located within the recess 304, and the cutting box 3 is equipped with a fastener 13. The fastener 13 is connected to the cutting box 3 via a pivot. There are two ways to set the pivot. One is that the axis of the pivot is parallel to the height direction of the cutting box 3. In this case, when it is necessary to connect the cutting box 3 and the intermediate connecting box 2 together, the pivot is rotated to make the fastener 13 avoid the position of the recess 304. After the connection is completed, the pivot is rotated again to make the fastener 13 rotate back to directly below the intermediate connecting box 2. The fastener 13 restricts the movement of the intermediate connecting box 2 along its own height direction, thereby realizing the connection between the cutting box 3 and the intermediate connecting box 2. Secondly, the axis of the rotating shaft is perpendicular to the height direction of the cutting box 3. A spring is fitted on the rotating shaft, with one end connected to the rotating shaft and the other end connected to the cutting box 3. When it is necessary to connect the cutting box 3 and the intermediate connecting box 2 together, the rotating shaft is rotated to make the fastener 13 avoid the recessed part 304, for example... Figure 8 As shown, the fastener 13 is rotated to be positioned along the height direction of the cutting box 3. After the connection is completed, the fastener 13 is released. Under the action of the spring force, the fastener 13 can rotate back to directly below the intermediate connecting box 2. At this time, the fastener is perpendicular to the height direction of the cutting box 3. The spring provides a certain connection force to ensure that the cutting box 3 and the intermediate connecting box 2 do not separate under a certain force.

[0069] In another embodiment of the present invention, as Figure 7 and Figure 8 As shown, the cutting mechanism includes a cutting blade 12 and a driving mechanism 14. The cutting blade 12 is used to cut the test piece. A connecting port 303 for connecting the intermediate connecting box 2 is provided at one end of the cutting box 3 near the intermediate connecting box 2. An installation groove is provided on the side wall of the connecting port 303, and the cutting blade 12 is slidably connected to the installation groove. The driving mechanism 14 is located on the cutting box 3 and is used to drive the cutting blade 12 to move towards or away from the test piece. After the test piece is placed inside the geotextile moisture characteristic curve measuring device, the connecting port 303 is arranged along the width direction of the test piece. The length of the connecting port 303 is exactly equal to the width of the test piece, and the width of the connecting port 303 is not less than the thickness of the test piece. The length direction of the test piece is parallel to the height direction of the cutting box 3. Compared with manual cutting, using the cutting blade 12 to cut the test piece results in higher cutting accuracy and avoids the impact of chipping and uneven cutting on test accuracy caused by manual cutting.

[0070] Furthermore, two mounting slots are provided on the two opposite side walls of the connecting port 303. There are two cutting blades 12. The cutting blades 12 correspond one-to-one with the mounting slots and are slidably connected. The test piece is placed between the two cutting blades 12, and the two cutting blades 12 cut the test piece together.

[0071] Furthermore, such as Figure 7 and Figure 8 As shown, the geotextile moisture characteristic curve measuring device also includes an intermediate connector. The drive mechanism 14 is a manual drive mechanism, located outside the cutting box 3. A guide groove 302 is provided on the side wall of the cutting box 3, with the length direction of the guide groove 302 parallel to the length direction of the installation groove. The drive mechanism 14 is connected to the cutting blade 12 via the intermediate connector, which is slidably connected to the guide groove 302. The manual drive mechanism 14 can be, for example, a drive block, and the size of the drive block is preferably larger than the size of the guide groove 302 to prevent the drive block from passing through the guide groove 302 and entering the cutting box 3. The drive mechanism 14 is located outside the cutting box 3, allowing for convenient manual operation by the user. The intermediate connector can be, for example, an intermediate connecting rod.

[0072] In another embodiment of the present invention, as Figure 4 As shown, the clamping mechanism includes two clamping plates 10. The insertion port is located at the end of the fixed box 1 away from the length adjustment box. Two sliding grooves are provided on the two opposite side walls of the insertion port. The two clamping plates 10 are slidably disposed in the two sliding grooves. The two clamping plates 10 are detachably connected, and one end of the workpiece to be tested can be clamped between the two clamping plates 10. The two clamping plates 10 are connected, for example, by bolts 15.

[0073] In another embodiment of the present invention, as Figure 4 As shown, a first scale line 8 is provided on the outer wall of the fixing box 1 along the height direction of the fixing box 1, and a second scale line 9 is provided on the outer wall of the length adjustment box body along the height direction of the length adjustment box body. More specifically, as shown... Figure 5 and Figure 6 As shown, the second scale line 9 is set on the outer wall of the intermediate connecting box 2 along the height direction of the intermediate connecting box 2.

[0074] In the description of this invention, it should be noted that certain terms indicating orientation or positional relationships are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0075] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for measuring the moisture characteristic curve of geotextile, characterized in that: include: A fixed box, a length adjustment box, and a test box are sequentially slidably nested together. The fixed box, the length adjustment box, and the test box are connected in sequence so that the test piece can pass through in sequence. The fixed box is provided with an inlet for the test piece to be placed, and the test box is provided with a through opening that communicates with the outside. A clamping mechanism is provided on the fixing box and is used to clamp or release one end of the test piece; The cutting mechanism for cutting the test piece includes at least two length adjustment boxes. Each cutting mechanism corresponds to one of the length adjustment boxes, and the cutting mechanism can be slidably provided on any of the length adjustment boxes along a direction perpendicular to its own height. A first linear drive mechanism connects the fixed box and the length adjustment box and is used to adjust the distance between the two. The second linear drive mechanism connects the length adjustment box and the test box and is used to adjust the distance between them.

2. The geotextile moisture characteristic curve measuring device according to claim 1, characterized in that: It also includes a third linear drive mechanism, which connects any two adjacent length adjustment boxes. The third linear drive mechanism is used to adjust the distance between two adjacent length adjustment boxes.

3. The geotextile moisture characteristic curve measuring device according to claim 2, characterized in that: The length adjustment box body includes a cutting box and an intermediate connecting box that are connected to each other. The cutting box closest to the fixed box is slidably nested with the fixed box and connected to it, and the two are connected by a first linear drive mechanism; The intermediate connecting box of the length adjustment box closest to the test box is slidably nested and connected to the fixed box, and the two are connected by a second linear drive mechanism; The intermediate connecting box of any two adjacent length adjustment boxes is slidably nested and connected to the cutting box of the other, and the two are connected by a third linear drive mechanism. Each of the cutting boxes is provided with the cutting mechanism.

4. The geotextile moisture characteristic curve measuring device according to claim 3, characterized in that: The first linear drive mechanism includes a first screw and a first mounting sleeve. The cutting box closest to the length adjustment box body of the fixed box is provided with a first mounting hole. The first mounting sleeve is rotatably disposed in the first mounting hole and is axially positioned. The first screw is fixedly connected to the fixed box. One end of the first screw is disposed in the first mounting sleeve and is threadedly connected to the inner wall of the first mounting sleeve. The second linear drive mechanism includes a second screw and a second mounting sleeve. The test box is provided with a second mounting hole. The second mounting sleeve is rotatably disposed in the second mounting hole and is axially positioned. The second screw is disposed on the intermediate connecting box of the length adjustment box body closest to the test box. One end of the second screw is disposed in the second mounting sleeve and is threadedly connected to the inner wall of the second mounting sleeve. The third linear drive mechanism includes a third screw and a third mounting sleeve. The cutting box is provided with a third mounting hole. The third mounting sleeve is rotatably disposed in the third mounting hole and is axially positioned. The third screw is disposed on the intermediate connecting box. One end of the third screw is disposed in the third mounting sleeve and is threadedly connected to the inner wall of the third mounting sleeve.

5. The geotextile moisture characteristic curve measuring device according to claim 3, characterized in that: The fixing box is open at one end near the length adjustment box body. The cutting box closest to the fixing box body is provided with a first recess that matches the shape of the fixing box. The fixing box is located in the first recess at one end near the length adjustment box body and is slidably connected to the first recess. The cutting box is open at one end away from the intermediate connecting box to enable communication between the cutting box closest to the fixed box and the fixed box, as well as communication between adjacent cutting boxes and the intermediate connecting box. Both ends of the intermediate connecting box are open to enable communication between the intermediate connecting box closest to the test box and the test box, as well as between adjacent intermediate connecting boxes and the cutting box. The test box is provided with a second recess that matches the shape of the intermediate connecting box closest to the test box. One end of the intermediate connecting box closest to the test box is disposed in the second recess and is slidably connected to the second recess. The remaining length adjustment box body has a third recessed cavity on the cutting box that matches the shape of the intermediate connecting box. The end of the intermediate connecting box near the cutting box is located in the third recessed cavity and is slidably connected to the third recessed cavity.

6. The geotextile moisture characteristic curve measuring device according to claim 3, characterized in that: The intermediate connecting box and the cutting box of the same length adjustment box body, one of which is provided with a recess that matches the other, the other being partially disposed in the recess, and the two are detachably connected.

7. The geotextile moisture characteristic curve measuring device according to claim 3, characterized in that: The cutting mechanism includes a cutting blade and a driving mechanism. The cutting blade is used to cut the workpiece to be tested. The cutting box has a communication port for connecting to the intermediate connecting box at one end. A mounting groove is provided on the side wall of the communication port. The cutting blade is slidably connected to the mounting groove. The driving mechanism is disposed on the cutting box and is used to drive the cutting blade to move toward or away from the workpiece to be tested.

8. The geotextile moisture characteristic curve measuring device according to claim 7, characterized in that: It also includes an intermediate connector. The driving mechanism is a manual driving mechanism. The driving mechanism is located outside the cutting box. A guide groove is provided on the side wall of the cutting box. The length direction of the guide groove is parallel to the length direction of the mounting groove. The driving mechanism is connected to the cutting blade through the intermediate connector. The intermediate connector is slidably connected to the guide groove.

9. The geotextile moisture characteristic curve measuring device according to claim 1 or 2, characterized in that: The clamping mechanism includes two clamping plates. The insertion port is located at one end of the fixing box away from the length adjustment box. Two sliding grooves are provided on the two opposite side walls of the insertion port. The two clamping plates are slidably disposed in the two sliding grooves. The two clamping plates are detachably connected. One end of the test piece can be clamped between the two clamping plates.

10. The geotextile moisture characteristic curve measuring device according to claim 1 or 2, characterized in that: A first scale line is provided on the outer wall of the fixing box along the height direction of the fixing box, and a second scale line is provided on the outer wall of the length adjustment box along the height direction of the length adjustment box.

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