A measurement plot for alfalfa biomass

Abstract

This utility model belongs to the field of herbaceous quadrat survey technology, and particularly relates to an alfalfa biomass measurement quadrat, including four connecting seats and locking folding bars. The four connecting seats and locking folding bars form a rectangular measurement quadrat. Each of the four connecting seats has a positioning rod slidably inserted, and each of the four positioning rods is fitted with a base seat, which is located below the corresponding connecting seat. In this utility model, when folding, simply push the push block in the opposite direction to separate the sliding block from the docking slot, thereby removing the restriction on the two side bars. Then, bend downwards along the two adjacent ends of the same locking folding bar, thereby reducing the space occupied by the alfalfa biomass measurement quadrat when stored. The sliding block can limit the two side bars, preventing the two side bars in the unfolded state from automatically bending and causing deformation of the measurement quadrat formed by the four connecting seats and locking folding bars.

Description

Technical Field

[0001] This utility model belongs to the field of herbaceous quadrat survey technology, and in particular relates to an alfalfa biomass measurement quadrat. Background Technology

[0002] Alfalfa biomass measurement quadrats are tools used in alfalfa cultivation to delineate a fixed-size measurement area, facilitating the counting and sampling of alfalfa plants within the area. For example, CN208443595U discloses a multifunctional herbaceous community quadrat survey frame, including a rectangular base, a vertical rod, a rectangular frame, a fixing hook, and a grid. By fixing different types of grids on the fixing hook, quadrat areas of different sizes can be formed. However, in actual use, multiple grids need to be carried to adapt to different measurement needs, increasing the carrying burden on staff. Furthermore, the rectangular base occupies a large space and is not foldable, resulting in a large overall storage space.

[0003] For example, CN209214948U discloses a grassland ecological monitoring fixed quadrat tool, including a fixed post, connectors, a folding ruler, and a rotating shaft. The folding ruler is rotatably connected to the fixed post via the rotating shaft, and a measurement frame is formed by four connectors and the folding ruler. Two rulers are rotatably connected by two connecting shafts, thus forming a foldable ruler that can be freely folded. By folding the ruler, the area occupied by the grassland ecological monitoring fixed quadrat tool during storage is reduced. However, in actual use, when the folding ruler is unfolded, the lack of a limiting device between the two rulers causes them to not be kept on the same horizontal plane. When the four fixed posts are inserted into the ground, the two rulers of the folding ruler exhibit height differences and misalignment, failing to form a flat measurement frame. This leads to deformation of the delineated measurement quadrat, affecting the normal counting and sampling work of the staff. Utility Model Content

[0004] (a) Technical problems to be solved This invention provides an alfalfa biomass measurement quadrat to solve the following problem: 1. The existing measurement quadrat frame is not foldable and requires carrying multiple grids to adapt to different measurement needs, which increases the carrying burden of staff and takes up a lot of space when stored. 2. In the existing technology, a foldable ruler is used to replace the quadrat frame. Although folding is achieved, the two rulers of the foldable ruler lack limiting devices. When unfolded, the two rulers cannot be fixed on the same horizontal plane, which causes the quadrat frame and the delineated quadrat to deform, affecting the normal counting and sampling work of the staff.

[0005] (II) Technical Content To achieve the above objectives, this utility model provides the following technical solution: An alfalfa biomass measurement quadrat includes four connecting seats arranged in a rectangular array. Adjacent connecting seats are rotatably connected by the same locking folding baffle. The four connecting seats and the locking folding baffle form a rectangular measurement quadrat. In two parallel locking folding bars, one of the locking folding bars is equipped with multiple automatic retractable cable winders, on which a cable is wound, and the free end of the cable is hung on the other locking folding bar. Each of the four connecting seats has a positioning rod that is slidably inserted into it, and each of the four positioning rods is fitted with a base support, which is located below the corresponding connecting seat. Both the connecting seat and the base are threaded with locking bolts on their outer walls, and the threaded end of the locking bolt abuts against the corresponding positioning rod.

[0006] Furthermore, the two adjacent connectors are integrally provided with a first mating ear at their close ends, and an external connecting shaft is fixedly connected to the first mating ear; The locking folding stop bar includes two side stop bars and a mating plate. Both ends of the side stop bars are provided with serial interfaces. The ends of the two side stop bars that are far apart are respectively rotatably sleeved on two outer serial shafts through the serial interfaces. Two inner serial shafts are fixed between the two mating plates. The ends of the two side stop bars that are close to each other are respectively rotatably sleeved on two inner serial shafts through the serial interfaces.

[0007] Furthermore, in the same locking folding stop bar, one of the two side stops has a stepped groove at the top of the end near the inner connecting shaft, and a sliding block is slidably connected in the stepped groove. The top of the stepped groove passes through the top of the side stop bar. A push block is integrally provided on the side of the sliding block away from the top of the inner connecting shaft. The push block is slidably connected to the stepped groove, and the top of the push block extends out of the stepped groove. The other side stop bar has a mating slot adapted to the sliding block at the end near the sliding block. One end of the sliding block is slidably inserted into the mating slot. When the sliding block is inserted into the mating slot, the tops of the two side bars are parallel; The sliding block and the stepped groove are interference-fitted.

[0008] Furthermore, in one of the two parallel locking folding bars, a second mating ear is fixedly connected at equal intervals on the same side of the two side bars of the locking folding bar. The free end of the second mating ear is inclined downwards, and an automatic retractable cable reel is fixedly connected to the free end of the second mating ear. The top of the first mating lug is integrally provided with a retaining edge, which is located above the corresponding side retaining strip; The free end of the line is fixed to a lifting crossbar, and the line is located in the middle of the lifting crossbar; In another locking folding stop bar, multiple first wire bundle plates are fixed to the outer sides of the two side stops. Each first wire bundle plate corresponds to an automatic telescopic retractable ... A notch is provided on the first locking part.

[0009] Furthermore, in the two parallel locking folding baffles, the second mating lug and the automatic telescopic retractable cable winder are both located on the outside of the corresponding side baffle. Multiple second cable bundles are fixed to the inside of the side baffle. Each second cable bundle corresponds to an automatic telescopic cable winder. The top of the second cable bundle is integrally provided with an arc-shaped second locking part, and the free end of the second locking part faces the side of the second cable bundle away from the automatic telescopic cable winder. A notch is provided on the second locking part.

[0010] Furthermore, the surface of the positioning rod is provided with scale lines.

[0011] Furthermore, the bottom of the positioning rod is spiked.

[0012] Furthermore, each of the four positioning rods is slidably fitted with a widened support leg; The top of the widened support leg is integrally provided with an inner hidden sleeve, which is slidably fitted onto the corresponding positioning rod. The outer wall of the inner hidden sleeve is threaded with a locking bolt, and the threaded end of the locking bolt abuts against the corresponding positioning rod.

[0013] Furthermore, the end of the locking bolt away from the corresponding positioning rod is circumferentially fixed with multiple handles.

[0014] Furthermore, the height of the positioning rod is greater than the length of the side stop bar.

[0015] (III) Beneficial Effects Compared with the prior art, the beneficial effects of this utility model are as follows: 1. In this utility model, when unfolding, first unfold the two side bars of the same locking folding bar and adjust the tops of the two side bars to be parallel. Then push the push block to make it drive the sliding block to slide along the direction of the docking slot. When the side of the sliding block away from the push block is inserted into the docking slot, the sliding block can limit the two side bars, thereby preventing the two side bars in the unfolded state from bending automatically, which would cause the measurement sample square formed by the four connecting seats and the locking folding bar to deform.

[0016] Second, in this utility model, when folding, simply push the push block in the opposite direction to separate the sliding block from the docking slot, thereby removing the restriction on the two side bars. Then, bend downwards along the two side bars that are close to each other in the same locking folding bar, thereby reducing the space occupied by the alfalfa biomass measurement plot when it is stored.

[0017] Third, in this utility model, the measurement quadrat can be subdivided into multiple small quadrat areas by the intersecting horizontal and vertical lines, so as to facilitate accurate sampling and counting of vegetation in different areas. At the same time, the staff can pull the lines at different positions as needed to form quadrat areas of different sizes in the measurement quadrat.

[0018] Fourth, in this utility model, when it is necessary to reduce the height of the measurement sample plot, a base support can be set for pre-positioning to prevent the four connecting seats from sliding down excessively with the locking folding baffle after all four threaded bolts on the connecting seats have stopped contacting the positioning rod.

[0019] Fifth, in this utility model, the sliding block and the stepped groove are interference-fitted, thereby increasing the frictional resistance between the sliding block and the stepped groove, preventing the sliding block from sliding in the stepped groove on its own under non-human operation, and avoiding the sliding block from falling out of the docking slot due to vibration or external force interference, which would cause the two side bars to shrink.

[0020] VI. In this utility model, the free end of the second mating ear is inclined downward. When folding, it bends downward along the end of the two side bars that are close to each other. At this time, the automatic telescopic winding device fixed to the free end of the second mating ear will face the corresponding positioning rod to avoid collision between the automatic telescopic winding devices on the two side bars when folding. The set stop edge can limit the top of the side stop bar, so that the two side stop bars in the locking folding stop bar can only bend downwards, avoiding the collision of the automatic retractable cable winders on the two side stop bars when they bend upwards.

[0021] VII. In this utility model, after the free end of the wire is pulled out by the lifting crossbar, the constant force spring inside the automatic telescopic winding device is in a stretched state. The lifting crossbar is pulled past the corresponding first locking part, and the wire is passed through the corresponding notch. The lifting crossbar is placed at the bottom of the first locking part, and then the lifting crossbar is stopped. At this time, the constant force spring in the stretched state will retract and return to its original position and pull the wire. At this time, the lifting crossbar abuts against the inside of the first locking part. The first locking part limits the lifting crossbar and prevents the constant force spring from pulling the wire back. Under the tension of the constant force spring, the wire is in a taut state, ensuring that the sampling area boundaries divided by the intersecting horizontal and vertical wires are clear and avoiding deformation of the sample area due to wire slack.

[0022] 8. In this utility model, when storing, the bottom of the positioning rod is hidden in the inner hidden sleeve, so that the bottom of the four widened support legs contacts the ground, thereby increasing the contact area with the ground, making the folded alfalfa biomass measurement plot more stable when placed and less likely to tip over. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the locking folding baffle in this utility model when unfolded; Figure 2 This is a schematic diagram of the structure of the lifting crossbar when it is engaged with the corresponding first locking part in this utility model; Figure 3 This is an exploded view of the connecting seat, bottom support, and side baffle in this utility model; Figure 4 This is a schematic diagram of the structure in which the sliding block and the docking slot are connected. Figure 5 This is a schematic diagram of the structure of the sliding block and the docking slot after separation in this utility model; Figure 6 This is a schematic diagram of the structure of the sliding block and the push block in this utility model; Figure 7 This is a schematic diagram of the structure of the first wire bundle plate and the first locking part in this utility model; Figure 8 This is an exploded view of the side baffle and the second wire bundle plate in this utility model; Figure 9 This is a schematic diagram of the positioning rod with scale lines in this utility model; Figure 10 This is a schematic diagram of the structure of the locking folding stop bar after folding in this utility model.

[0024] In the diagram: 11. Connecting seat; 111. First mating ear; 112. Outer connecting shaft; 113. Stop edge; 146. Locking bolt; 1461. Handle; 21. Automatic telescopic reel; 22. Cable body; 221. Lifting crossbar; 31. Positioning rod; 41. Base support; 51. Side stop bar; 5101. Connecting interface; 5102. Stepped groove; 5103. Connecting slot; 511. Second mating ear; 512. First cable bundle plate; 5121. First locking part; 513. Second cable bundle plate; 5131. Second locking part; 52. Connecting plate; 521. Inner connecting shaft; 53. Sliding block; 54. Push block; 61. Widened support leg; 611. Inner hidden sleeve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1 like Figures 1-10 As shown, an alfalfa biomass measurement quadrat includes four connecting seats 11 arranged in a rectangular array. The same locking folding baffle is rotatably connected between two adjacent connecting seats 11. The four connecting seats 11 and the locking folding baffle form a rectangular measurement quadrat. Each of the four connecting seats 11 has a positioning rod 31 that is slidably inserted into it. In one of the two parallel locking folding barriers, multiple automatic retractable cable reels 21 are installed. These automatic retractable cable reels 21 are existing technology, and their working principle is common knowledge and will not be elaborated upon here. A cable 22 is wound around the automatic retractable cable reel 21, and the free end of the cable 22 is hung on the other locking folding barrier. Specifically, in use, the locking folding barrier is unfolded, and the four positioning rods 31 are inserted into the ground. Then, the cable is wound around one of the two parallel locking folding barriers. The adjustment of the folding bars involves pulling the line 22 out of the automatic telescopic reel 21 and hanging it on another corresponding locking folding bar. Then, the adjustment of another set of two parallel locking folding bars is performed (the adjustment method is the same as above and will not be repeated here). The cross-shaped lines 22 can refine the measurement quadrat into multiple small quadrat areas, which facilitates accurate sampling and counting of vegetation areas. At the same time, the staff can pull the lines 22 at different positions as needed to form quadrat areas of different sizes in the measurement quadrat.

[0027] Each of the four positioning rods 31 is fitted with a base support 41, and the base support 41 is located below the corresponding connecting seat 11; like Figure 1 and Figure 9 As shown, locking bolts 146 are threaded onto the outer walls of both the connecting seat 11 and the base 41. The threaded end of the locking bolt 146 abuts against the corresponding positioning rod 31. As the locking bolt 146 is tightened, the threaded end of the locking bolt 146 applies a certain compressive force to the positioning rod 31, thereby increasing the friction between the locking bolt 146 and the positioning rod 31, ensuring that the adjusted base 41 can be stably fitted onto the positioning rod 31.

[0028] Specifically, when it is necessary to lower the height of the measurement sample plot, first rotate the locking bolt 146 on the base 41 to stop it from contacting the positioning rod 31, slide the base 41 down to the desired position, and retighten the locking bolt 146 so that it abuts against the positioning rod 31. After adjusting the four base 41s to the same height in sequence, rotate the locking bolt 146 threaded to the connecting seat 11 to stop it from contacting the positioning rod 31. When all four locking bolts 146 threaded to the connecting seat 11 have stopped contacting the positioning rod 31, the connecting seat 11 will slide down along the positioning rod 31 until the bottom of the connecting seat 11 contacts the top of the base 41. When the bottom of the connecting seat 11 contacts the top of the base 41, rotate the locking bolt 146 threaded to the connecting seat 11 to make it abut against the positioning rod 31 again, and the adjustment is completed.

[0029] By setting the base 41, pre-positioning can be achieved, preventing the four connecting seats 11 from sliding excessively with the locking folding strips after all four threaded bolts 146 on the connecting seats 11 have stopped contacting the positioning rod 31.

[0030] Furthermore, such as Figure 9 As shown, the surface of the positioning rod 31 is provided with scale lines so that the staff can adjust the four base supports 41 to the same height.

[0031] Furthermore, in combination Figure 1 and Figure 3 Two adjacent connectors 11 are integrally provided with a first mating ear 111 at their close ends, and an external connecting shaft 112 is fixedly connected to the first mating ear 111. The locking folding stop bar includes two side stop bars 51 and a connecting plate 52. Each side stop bar 51 has a connecting interface 5101 at both ends. The ends of the two side stop bars 51 that are far apart are rotatably sleeved on two outer connecting shafts 112 via the connecting interfaces 5101. The outer connecting shafts 112 can limit the movement of one end of the side stop bar 51. Two inner connecting shafts 521 are fixedly connected between the two connecting plates 52. The ends of the two side stop bars 51 that are close together are rotatably sleeved on the two inner connecting shafts 521 via the connecting interfaces 5101. The two inner connecting shafts 521 can limit the movement of the close-to-close ends of the two side stop bars 51. Furthermore, in combination Figure 1 , Figures 3-6Two side bars 51 in the same locking folding bar, one side bar 51 has a stepped groove 5102 at the top of one end near the inner connecting shaft 521, a sliding block 53 is slidably connected in the stepped groove 5102, the top of the stepped groove 5102 passes through the top of the side bar 51, a push block 54 is integrally provided on the side of the sliding block 53 away from the top of the inner connecting shaft 521, the push block 54 is slidably connected to the stepped groove 5102 and the top of the push block 54 extends out of the stepped groove 5102, the other side bar 51 has a docking slot 5103 adapted to the sliding block 53 at one end near the sliding block 53, one end of the sliding block 53 is slidably inserted into the docking slot 5103; When the sliding block 53 is inserted into the mating slot 5103, the tops of the two side bars 51 are parallel; Specifically, during unfolding, first unfold the two side bars 51 in the same locking folding bar and adjust the tops of the two side bars 51 to be parallel. Then push the push block 54 to make it drive the sliding block 53 to slide along the direction of the docking slot 5103. When the side of the sliding block 53 away from the push block 54 is inserted into the docking slot 5103, the sliding block 53 can limit the two side bars 51 to prevent the two side bars 51 in the unfolded state from bending automatically, which would cause the measurement square formed by the four connecting seats 11 and the locking folding bar to deform. The sliding block 53 is interference-fitted with the stepped groove 5102, thereby increasing the frictional resistance between the sliding block 53 and the stepped groove 5102, preventing the sliding block 53 from sliding in the stepped groove 5102 under non-human operation, and avoiding the sliding block 53 from falling out of the docking slot 5103 due to vibration or external interference, which would cause the two side bars 51 to shrink. When folding, simply push the push block 54 in the opposite direction to separate the sliding block 53 from the mating slot 5103, thereby removing the restriction on the two side stops 51. Furthermore, in conjunction with... Figure 1 , Figure 3 , Figure 7 , Figure 8 and Figure 10 In one of the two parallel locking folding bars, the two side bars 51 of the locking folding bar are fixedly connected to the same side of the two side bars 51 at equal intervals. The free end of the second docking ear 511 is set at an angle downward. An automatic retractable winder 21 is fixedly connected to the free end of the second docking ear 511. When folding, the bar bends downward along the end of the two side bars 51 that is close to each other. At this time, the automatic retractable winder 21 fixed to the free end of the second docking ear 511 will face the corresponding positioning rod 31 to avoid collision between the automatic retractable winders 21 on the two side bars 51 when folding. like Figure 3As shown, a retaining edge 113 is integrally provided on the top of the first docking ear 111, and the retaining edge 113 is located above the corresponding side retaining strip 51; the retaining edge 113 can limit the top of the side retaining strip 51, so that the two side retaining strips 51 in the locking folding retaining strip can only be bent downwards, so as to avoid the automatic retractable winding device 21 on the two side retaining strips 51 from colliding when the two side retaining strips 51 are bent upwards; like Figure 7 and Figure 8 As shown, a lifting crossbar 221 is fixed to the free end of the line 22. The line 22 is located in the middle of the lifting crossbar 221. By setting the lifting crossbar 221, the area of ​​the free end of the line 22 can be increased, so that the staff can handle it. In another locking folding stop bar, multiple first wire bundle plates 512 are fixed to the outer sides of the two side stops 51. The first wire bundle plates 512 correspond one-to-one with the automatic telescopic wire reel 21. The top of the first wire bundle plate 512 is integrally provided with an arc-shaped first locking part 5121, and the free end of the first locking part 5121 faces the side of the first wire bundle plate 512 away from the automatic telescopic wire reel 21. A notch is provided on the first locking part 5121.

[0032] Specifically, after the free end of the wire 22 is pulled out by the lifting bar 221, the constant force spring inside the automatic telescopic reel is in a stretched state. The lifting bar 221 is pulled past the corresponding first locking part 5121, and the wire 22 is passed through the corresponding notch. The lifting bar 221 is placed at the bottom of the first locking part 5121, and then the pulling of the lifting bar 221 is stopped. At this time, the constant force spring in the stretched state will retract and return to its original position and pull the wire 22. At this time, the lifting bar 221 abuts against the inside of the first locking part 5121. The first locking part 5121 limits the lifting bar 221 and prevents the constant force spring from pulling the wire 22 back. Under the tension of the constant force spring, the wire 22 is in a taut state, ensuring that the sampling area boundary divided by the intersecting wires 22 is clear and avoiding deformation of the sample area due to the slack of the wires 22.

[0033] The notch allows workers to move the lifting bar 221 with the wire 22 to the bottom of the first locking part 5121, preventing the wire 22 from interfering with the first locking part 5121.

[0034] Furthermore, the bottom of the positioning rod 31 is spiked to facilitate inserting the bottom of the positioning rod 31 into the ground; like Figure 1 , Figure 9 and Figure 10 As shown, each of the four positioning rods 31 is slidably fitted with a widened support leg 61; The top of the widened support leg 61 is integrally provided with an inner hidden sleeve 611, which is slidably sleeved on the corresponding positioning rod 31. A locking bolt 146 is threadedly connected to the outer wall of the inner hidden sleeve 611, and the threaded end of the locking bolt 146 abuts against the corresponding positioning rod 31.

[0035] When inserting the bottom of the positioning rod 31 into the soil, first adjust the position of the widened support leg 61. During adjustment, rotate the locking bolt 146 threaded onto the inner hidden sleeve 611 to stop it from contacting the positioning rod 31. After adjusting the four widened support legs 61 to the same height according to the scale lines on the surface of the positioning rod 31, tighten the locking bolt 146 again so that it abuts against the positioning rod 31. Then insert the positioning rod 31, which is located below the widened support leg 61, into the soil. When the bottom of the widened support leg 61 contacts the ground, the insertion of the positioning rod 31 is complete. The widened support leg 61 can further increase the contact area between the positioning rod 31 and the ground, preventing the positioning rod 31 from swinging during use.

[0036] When folding, the positioning rod 31 is pulled out of the soil, the soil attached to the positioning rod 31 is cleaned off, and the height of the widened support leg 61 is adjusted again (the adjustment method is the same as above, so it will not be described in detail here), so that the bottom of the positioning rod 31 is hidden in the inner hidden sleeve 611. When stored, compared to the bottom of the positioning rod 31 which has a spike-like end that contacts the ground, the bottom of the four widened support legs 61 contacts the ground, which increases the contact area with the ground, making the folded alfalfa biomass measurement plot more stable when placed and less likely to tip over.

[0037] Furthermore, the end of the locking bolt 146 away from the corresponding positioning rod 31 is circumferentially fixed with multiple handles 1461. The handles 1461 can increase the contact area between the operator and the locking bolt 146, so that the operator can rotate the locking bolt 146.

[0038] Furthermore, the height of the positioning rod 31 is greater than the length of the side guard strip 51, ensuring that the folded side guard strip 51 will not collide with the ground, thus preventing damage to the side guard strip 51 and the automatic retractable cable reel 21 due to impact.

[0039] Example 2 like Figures 1-10 As shown, this embodiment is improved upon embodiment one as follows: Further, as... Figure 7 and Figure 8 As shown, in the two parallel locking folding barriers, the second mating lug 511 and the automatic retractable reel 21 are both located outside the corresponding side barrier 51, thereby avoiding multiple automatic retractable reel 21 occupying a large amount of space in the measurement sample area and interfering with the staff's sampling, counting and other work.

[0040] When the automatic retractable cable reel 21 pulls the corresponding cable 22 to reset, a portion of the cable 22 will be exposed outside the automatic retractable cable reel 21. In order to prevent the exposed cables 22 from getting tangled, the operator can fix multiple second cable bundles 513 to the inside of the side baffle 51. The second cable bundles 513 correspond one-to-one with the automatic retractable cable reel 21. The top of the second cable bundle 513 is integrally provided with an arc-shaped second locking part 5131, and the free end of the second locking part 5131 faces the side of the second cable bundle 513 away from the automatic retractable cable reel 21. A notch is provided on the second locking part 5131.

[0041] Before folding, the operator needs to separate the cable 22 and the lifting crossbar 221 from the first locking part 5121. At this time, the constant force spring, which is under tension, will contract and pull the cable 22 to reset. The operator can then move the lifting crossbar 221 to the bottom of the corresponding second locking part 5131. The second locking part 5131 can prevent the cable 22 from resetting. At the same time, under the tension of the constant force spring, the lifting crossbar 221 abuts against the inner wall of the second locking part 5131. Meanwhile, the cable 22 located between the lifting crossbar 221 and the automatic telescopic cable winder 21 is in a taut state, thereby preventing the cable 22 from getting tangled.

[0042] The notch allows workers to move the lifting bar 221 with the wire 22 to the bottom of the second locking part 5131, preventing the wire 22 from interfering with the second locking part 5131.

[0043] In summary, the workflow of this utility model is as follows: Before use, unfold the locking folding stop bar. When unfolding, unfold the two side stops 51 in the same locking folding stop bar and adjust the tops of the two side stops 51 to be parallel. Then push the push block 54 to make it drive the sliding block 53 to slide along the direction of the docking slot 5103. When the side of the sliding block 53 away from the push block 54 is inserted into the docking slot 5103, the sliding block 53 can limit the two side stops 51 to prevent the two side stops 51 in the unfolded state from bending automatically. Then, the four positioning rods 31 are inserted into the soil. After insertion, the staff first adjusts one set of two parallel locking folding bars according to the required area. That is, the line 22 is pulled out from the automatic telescopic reel 21 and engaged with the corresponding first locking part 5121 through the lifting crossbar 221. Then the other set of two parallel locking folding bars is adjusted (the adjustment method is the same as above, so it will not be described in detail here). After the adjustment is completed, the work begins.

[0044] After the work is completed, the thread 22 and the lifting crossbar 221 are separated from the first locking part 5121. At this time, the constant force spring in the tension state will contract and pull the thread 22 to make it return to its original position. At this time, the worker moves the lifting crossbar 221 to the bottom of the corresponding second locking part 5131. Under the tension of the constant force spring, the lifting crossbar 221 abuts against the inner wall of the second locking part 5131, and the thread 22 is in a taut state. When folding, first remove the four positioning rods 31 from the soil and clean off the soil attached to the positioning rods 31. Then adjust the height of the widened support leg 61 so that the bottom of the positioning rod 31 is hidden in the inner hidden sleeve 611. Then push the four push blocks 54 in reverse order to separate the sliding block 53 from the docking slot 5103. Then bend downward along the two side bars 51 of the same locking folding bar to fold.

[0045] However, as is well known to those skilled in the art, the working principle and wiring method of the automatic retractable cable reel 21 are commonplace and are all conventional means or common knowledge. Therefore, they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0046] The different embodiments described above can be combined, substituted, or used in combination with each other.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quadrat for measuring alfalfa biomass, characterized in that: It includes four connecting seats (11), which are arranged in a rectangular array. The two adjacent connecting seats (11) are rotatably connected by the same locking folding baffle. The four connecting seats (11) and the locking folding baffle form a rectangular measurement square. In two parallel locking folding bars, one of the locking folding bars is equipped with multiple automatic retractable ... Each of the four connecting seats (11) is slidably connected with a positioning rod (31), and each of the four positioning rods (31) is fitted with a base support (41), which is located below the corresponding connecting seat (11). Both the connecting seat (11) and the base seat (41) have locking bolts (146) threaded on their outer walls, and the threaded end of the locking bolt (146) abuts against the corresponding positioning rod (31).

2. The alfalfa biomass measurement plot according to claim 1, characterized in that: Two adjacent connectors (11) are integrally provided with a first mating ear (111) at their close ends, and an external connecting shaft (112) is fixedly connected to the first mating ear (111). The locking folding stop bar includes two side stop bars (51) and a connecting plate (52). Both ends of the side stop bars (51) are provided with a serial interface (5101). The ends of the two side stop bars (51) that are far apart are respectively rotatably sleeved on two outer serial shafts (112) through the serial interface (5101). Two inner serial shafts (521) are fixed between the two connecting plates (52). The ends of the two side stop bars (51) that are close to each other are respectively rotatably sleeved on two inner serial shafts (521) through the serial interface (5101).

3. The alfalfa biomass measurement plot according to claim 2, characterized in that: Two side bars (51) in the same locking folding bar, one side bar (51) has a stepped groove (5102) at the top of the end near the inner connecting shaft (521), a sliding block (53) is slidably connected in the stepped groove (5102), the top of the stepped groove (5102) passes through the top of the side bar (51), a push block (54) is integrally provided on the side of the sliding block (53) away from the top of the inner connecting shaft (521), the push block (54) is slidably connected to the stepped groove (5102) and the top of the push block (54) extends out of the stepped groove (5102), the other side bar (51) has a mating slot (5103) adapted to the sliding block (53) at the end near the sliding block (53), one end of the sliding block (53) is slidably inserted into the mating slot (5103); When the sliding block (53) is inserted into the mating slot (5103), the tops of the two side bars (51) are parallel; The sliding block (53) is interference-fitted with the stepped groove (5102).

4. The alfalfa biomass measurement plot according to claim 2, characterized in that: In one of the two parallel locking folding bars, the two side bars (51) of the locking folding bar are fixedly connected to the same side of the two side bars (51) at equal intervals. The free end of the second docking ear (511) is inclined downward and the free end of the second docking ear (511) is fixedly connected to an automatic retractable reel (21). The top of the first mating lug (111) is integrally provided with a retaining edge (113), which is located above the corresponding side retaining strip (51); The free end of the line (22) is fixed to a lifting crossbar (221), and the line (22) is located in the middle of the lifting crossbar (221); In another locking folding stop bar, the outer sides of the two side stops (51) are fixed with multiple first wire bundle plates (512). The first wire bundle plates (512) correspond one-to-one with the automatic telescopic retractable ... A notch is provided on the first locking part (5121).

5. The alfalfa biomass measurement plot according to claim 4, characterized in that: In the two parallel locking folding baffles, the second mating lug (511) and the automatic telescopic reel (21) are both located on the outside of the corresponding side baffle (51). Multiple second cable trays (513) are fixed to the inside of the side baffle (51). The second cable trays (513) correspond one-to-one with the automatic telescopic reel (21). The top of the second cable tray (513) is integrally provided with an arc-shaped second locking part (5131), and the free end of the second locking part (5131) faces the side of the second cable tray (513) away from the automatic telescopic reel (21). A notch is provided on the second locking part (5131).

6. The alfalfa biomass measurement plot according to claim 1, characterized in that: The surface of the positioning rod (31) is provided with scale lines.

7. The alfalfa biomass measurement plot according to claim 1, characterized in that: The bottom of the positioning rod (31) is spiked.

8. The alfalfa biomass measurement plot according to claim 1, characterized in that: Widened support legs (61) are slidably fitted on all four positioning rods (31); The top of the widened support (61) is integrally provided with an inner hidden sleeve (611), which is slidably sleeved on the corresponding positioning rod (31). A locking bolt (146) is threadedly connected to the outer wall of the inner hidden sleeve (611), and the threaded end of the locking bolt (146) abuts against the corresponding positioning rod (31).

9. The alfalfa biomass measurement plot according to claim 8, characterized in that: The locking bolt (146) is circumferentially fixed to one end away from the corresponding positioning rod (31) with multiple handles (1461).

10. The alfalfa biomass measurement plot according to claim 2, characterized in that: The height of the positioning rod (31) is greater than the length of the side stop (51).

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