A rice breeding yield measuring device

Abstract

The invention discloses a rice breeding yield measuring device, comprising a base, a thin shaft is provided at the lower end of the base, a support rod is provided above the thin shaft, the support rod can slide up and down relative to the base and can be fixed, a rectangular block is provided on the support rod, a thin rod is fixed at the lower end of the rectangular block, a clamping unit is provided at the lower end of the rectangular block on the rear side of the thin rod, a square tube with an axis along the vertical direction is provided in the middle of the support rod, the square tube can slide up and down along the support rod and can be fixed, a square hole is provided at the front end of the square tube, a rotating shaft is provided in the square tube, a torsion spring is provided between the rotating shaft and the square tube, a tape measure is provided on the rotating shaft, the torsion spring makes the tape measure always have a tendency to be rolled up, the outer end of the tape measure extends upward from the square tube, bypasses the thin rod and the thin shaft in turn, and then enters the square tube from below and is fixed on the inner wall of the front side of the square tube, and the end of the tape measure is flush with the lower side wall of the square hole. The invention solves the problems of time and labor consumption in measuring the plant height of rice, especially giant rice, and it is difficult to ensure that the ear is upright and reading is difficult at this stage.

Description

Technical Field

[0001] The invention belongs to the field of crop yield measurement, and in particular relates to a rice breeding yield measurement device. Background Art

[0002] During the cultivation process of rice varieties, rice is sampled and tested many times every season to evaluate the growth of rice at each stage and estimate the yield. Among them, the height of the rice plants needs to be measured. Whether it is the traditional method of direct measurement with a tape measure or measurement with a special plant height measuring instrument, one person needs to hold the tape measure or the measuring instrument body so that the marked part is close to the rice plant, and the other person pinches the soft ear of the rice to keep the ear upright, and then reads the result. The measurement method is cumbersome, and because the plant height measuring instrument needs to be adjusted and calibrated before each use, manual measurement with a tape measure is still the main method at this stage. The researchers keep repeating the process of "squatting to place the zero scale of the tape measure at the root of the rice" and "standing to read the result", which is very physically demanding.

[0003] In addition, the average plant height of giant rice currently being promoted reaches 180CM, and the height of some individual plants reaches two meters. When measuring, researchers need to raise their arms to pinch the relatively soft panicle to keep it upright. The plant height of nearly two meters also brings many inconveniences to the reading work. Therefore, at this stage, there is still a need for a device that can be suitable for giant rice and can quickly and conveniently measure plant height. Summary of the invention

[0004] The purpose of the present invention is to propose a rice breeding yield measuring device to solve the problems that the current plant height measurement of rice, especially giant rice, is time-consuming and labor-intensive, and it is difficult to ensure the uprightness of the panicle and the reading is difficult.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rice breeding yield measuring device comprises a base, a horizontal thin shaft is provided at the lower end of the base, a support rod is provided above the thin shaft, the support rod can slide up and down relative to the base and can be fixed, a rectangular block is provided at the upper end of the support rod, a thin rod is fixed at the lower end of the rectangular block, a clamping unit is provided at the lower end of the rectangular block on the rear side of the thin rod, the clamping unit can grasp objects behind the support rod, a square tube with an axis along the vertical direction is provided in the middle of the support rod, the square tube can slide up and down along the support rod and can be fixed, a square hole is provided at the front end of the square tube, a rotating shaft is provided in the square tube, a torsion spring is provided between the rotating shaft and the square tube, a tape measure is provided on the rotating shaft, the torsion spring makes the tape measure always have a tendency to be rolled up, the outer end of the tape measure extends upward from the square tube, bypasses the thin rod and the thin shaft in turn, and then enters the square tube from below, and is fixed on the inner wall of the front side of the square tube, and the end of the tape measure is flush with the lower side wall of the square hole.

[0007] As a further description of the above technical solution:

[0008] The base is an arc-shaped plate with its axis in the vertical direction, the opening of the arc-shaped plate faces rearward, a slide groove is provided on the side wall of the arc-shaped plate, and the upper end of the slide groove extends to the top surface of the arc-shaped plate; the support rod is a long rod with a U-shaped cross-section, the opening of the support rod faces rearward, and two clamping plates are fixed on each of the left and right sides of the support rod, the four clamping plates are all arc-shaped and coaxial with the arc-shaped plate, and the distance between the two clamping plates on the same side of the support rod is equal to the thickness of the arc-shaped plate; the support rod can be inserted into the slide groove from above the arc-shaped plate, and the four clamping plates are respectively fitted with the front and rear end surfaces of the arc-shaped plate on both sides of the slide groove, thereby enabling the support rod to slide up and down relative to the base.

[0009] As a further description of the above technical solution:

[0010] A short shaft is rotatably connected to the arc plate on the left side of the slide slot, a gear is fixed on the short shaft, a turntable is fixed on the front end of the gear, a rack is fixed on the left wall of the clamping plate in front of the left side of the support rod, the rack is always meshed with the gear, a rectangular hole is opened on the arc plate on the left side of the gear, the rectangular hole passes through the inner and outer side walls of the arc plate, and a bolt is arranged in the rectangular hole, the big head end of the bolt is located in the arc plate, the small head end of the bolt extends from the rectangular hole to the front end of the arc plate and is fixed with a rubber block, a convex block is fixed on the arc plate above the rectangular hole, a tension spring is arranged between the convex block and the rubber block, when the tension spring pulls the rubber block to the upper end of the rectangular hole, the rubber block squeezes the gear on the right side so that it cannot rotate; thereby the support rod can be fixed relative to the base.

[0011] As a further description of the above technical solution:

[0012] The front end of the support rod is provided with a clearance groove running through the front and rear side walls, the square tube is located in the U-shaped frame of the support rod, a sliding rod with an axis along the front and rear direction is fixed on the front side wall of the square tube below the square hole, the front end of the sliding rod extends from the clearance groove and is fixed with a baffle, a square pull block is provided in the middle of the sliding rod, the left and right width of the pull block is greater than the left and right width of the clearance groove, a compression spring is provided between the pull block and the baffle, and a rubber pad is provided on the rear end face of the pull block, the compression spring can make the pull block squeeze the front side wall of the square rod, so that the square tube can be fixed at any height while sliding up and down relative to the support rod.

[0013] As a further description of the above technical solution:

[0014] The support rod is provided with a square groove running through the left and right side walls, and the square groove extends upward to the upper end surface of the support rod, a sink groove is respectively provided on the left and right side walls of the rectangular block, and a through groove is provided between the bottom surfaces of the two sink grooves, and a pressure plate is provided in each sink groove, and a cylindrical block is fixed to the side of the two pressure plates facing the through groove, and a spring is mounted on the two cylindrical blocks, and the spring gives the two pressure plates a force to separate from the sink grooves to both sides, and a vertical plate is fixed to the side of the two pressure plates facing away from the through groove, and a flat plate is fixed to the other end of the vertical plate; when in use, the two flat plates are pressed toward the middle so that the two pressure plates are embedded in the two sink grooves, and then the rectangular block is slid into the support rod from the upper end of the square groove, at this time, the flat plate is located on the outside of the support rod, the two vertical plates are located in the square groove, and the rectangular block is located in the U-shaped frame of the support rod, and the two side plates are released, and the spring squeezes the side walls of the square rod through the pressure plate, thereby fixing the rectangular block at a certain height on the square rod.

[0015] As a further description of the above technical solution:

[0016] The clamping unit includes a circular shaft, which has two circular shafts and is symmetrically fixed on the lower end surface of the rectangular block on the rear side of the thin rod. An arc-shaped bent rod is hinged on the circular shaft on the left, and two arc-shaped bent rods are hinged on the circular shaft on the right. The opening directions of the bent rods on both sides are opposite. A torsion spring is provided between each bent rod and the circular shaft. The torsion spring always makes the three bent rods gather toward the center, and when the three bent rods gather toward the center, the bent rod on the left is located between the two bent rods on the right, and the upper end of the bent rod on the left is on the same horizontal plane as the upper end of the thin rod.

[0017] As a further description of the above technical solution:

[0018] A horizontal support plate is provided under the base. When in use, the support plate is in contact with the ground to improve the stability of the device. The thin shaft is fixed on the upper end surface of the support plate, and a cylinder is coaxially provided on the thin shaft and the thin rod. The cylinder can rotate relative to the thin shaft or the thin rod, thereby reducing the friction when the tape measure moves relative to the thin shaft or the thin rod.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] (1) The present invention adopts a telescopic structure of a support rod and a base, and a clamping unit that can slide up and down is provided on the support rod, so that there is no need for a special person to hold the tip of the rice ear by hand during the measurement process. This not only saves manpower and improves the sampling and measurement efficiency, but also enables researchers to obtain more plant height data in the same time, thereby improving the accuracy of the final data by expanding the sample capacity. In addition, for giant rice plants that are inconvenient to hold the tip of the ear, the device can also measure the plant height of the giant rice by first clamping the rice plant and then sliding the support rod up. It has a wider range of applications and does not require the action of raising hands to hold the tip of the ear, saving time and effort.

[0021] (2) The present invention sets the tape measure in a square tube, passes the outer end of the tape measure over the thin shaft and the thin rod, and then fixes it in the square tube, so that the tape measure forms a circle, and ensures that the thin shaft and the thin rod are flush with the root and the tip of the rice plant respectively through a support plate and three bent rods, so that the value on the tape measure corresponding to the outer end of the tape measure is twice the height of the rice plant. In addition, the square tube can slide up and down on the support rod, so that the researcher can read the plant height value at a more convenient height, which not only speeds up the speed of a single measurement, but also avoids the error caused by the researcher tilting upward to read the value, so that the measurement data is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the present invention;

[0023] Figure 2 It is a front view of the present invention;

[0024] Figure 3 A top view of the present invention;

[0025] Figure 4 It is a schematic diagram of parts of the base of the present invention;

[0026] Figure 5 It is a schematic diagram of parts of the support rod of the present invention;

[0027] Figure 6 It is a schematic diagram of the installation of the rectangular block, the clamping unit and the flat plate of the present invention;

[0028] Figure 7 It is a schematic diagram of the installation of the square tube and the pull block of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the support rod sliding and fixing relative to the base of the present invention;

[0030] Fig. 9 It is a schematic diagram of the installation of the tape measure and the square tube of the present invention.

[0031] Legend: 1. Base; 2. Thin shaft; 3. Support rod; 4. Rectangular block; 5. Thin rod; 6. Square cylinder; 7. Square hole; 8. Rotating shaft; 9. Tape measure; 10. Slide groove; 11. Clamp; 12. Gear; 13. Turntable; 14. Rack; 15. Rectangular hole; 16. Rubber block; 17. Tension spring; 18. Give way groove; 19. Pull block; 20. Square groove; 21. Countersunk groove; 22. Through groove; 23. Press plate; 24. Flat plate; 25. Round shaft; 26. Bent rod; 27. Support plate; 28. Cylinder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-9 The present invention provides a technical solution for a rice breeding yield measuring device:

[0034] A rice breeding yield measuring device comprises a base 1, a horizontal thin shaft 2 is provided at the lower end of the base 1, a support rod 3 is provided above the thin shaft 2, the support rod 3 can slide up and down relative to the base 1 and can be fixed, a rectangular block 4 is provided at the upper end of the support rod 3, a thin rod 5 is fixed at the lower end of the rectangular block 4, a clamping unit is provided at the lower end of the rectangular block 4 on the rear side of the thin rod 5, and the clamping unit can grasp the object behind the support rod 3, a square tube 6 with an axis along the vertical direction is provided in the middle of the support rod 3, the square tube 6 can slide up and down along the support rod 3 and can be fixed, a square hole 7 is provided at the front end of the square tube 6, a rotating shaft 8 is provided in the square tube 6, a torsion spring is provided between the rotating shaft 8 and the square tube 6, a tape measure 9 is provided on the rotating shaft 8, the torsion spring makes the tape measure 9 always have a tendency to be rolled up, the outer end of the tape measure 9 extends upward from the square tube 6, bypasses the thin rod 5 and the thin shaft 2 in turn, and then enters the square tube 6 from the bottom, and is fixed on the front inner wall of the square tube 6, and the end of the tape measure 9 is flush with the lower side wall of the square hole 7.

[0035] The base 1 is an arc-shaped plate with its axis in the vertical direction, the opening of the arc-shaped plate faces rearward, a slide groove 10 is provided on the side wall of the arc-shaped plate, and the upper end of the slide groove 10 extends to the top surface of the arc-shaped plate; the support rod 3 is a long rod with a U-shaped cross-section, the opening of the support rod 3 faces rearward, and two clamping plates 11 are fixed on each of the left and right sides of the support rod 3, the four clamping plates 11 are all arc-shaped and coaxial with the arc-shaped plate, and the distance between the two clamping plates 11 on the same side of the support rod 3 is equal to the thickness of the arc-shaped plate; the support rod 3 can be inserted into the slide groove 10 from above the arc-shaped plate, and the four clamping plates 11 are respectively fitted with the front and rear end surfaces of the arc-shaped plate on both sides of the slide groove 10, thereby enabling the support rod 3 to slide up and down relative to the base 1.

[0036] A short shaft is rotatably connected to the arc plate on the left side of the slide slot 10, and a gear 12 is fixed on the short shaft. A turntable 13 is fixed to the front end of the gear 12. A rack 14 is fixed to the left wall of the clamping plate 11 in front of the left side of the support rod 3, and the rack 14 is always engaged with the gear 12. A rectangular hole 15 is opened on the arc plate on the left side of the gear 12, and the rectangular hole 15 passes through the inner and outer side walls of the arc plate, and a bolt is arranged in the rectangular hole 15. The big head end of the bolt is located in the arc plate, and the small head end of the bolt extends from the rectangular hole 15 to the front end of the arc plate and is fixed with a rubber block 16. A convex block is fixed on the arc plate above the rectangular hole 15, and a tension spring 17 is arranged between the convex block and the rubber block 16. When the tension spring 17 pulls the rubber block 16 to the upper end of the rectangular hole 15, the rubber block 16 squeezes the gear 12 on the right side to make it unable to rotate; thereby enabling the support rod 3 to be fixed relative to the base 1.

[0037] The front end of the support rod 3 is provided with a clearance groove 18 running through the front and rear side walls. The square tube 6 is located in the U-shaped frame of the support rod 3. A sliding rod with an axis along the front and rear direction is fixed on the front side wall of the square tube 6 below the square hole 7. The front end of the sliding rod extends from the clearance groove 18 and is fixed with a baffle. A square pull block 19 is provided in the middle of the sliding rod. The left and right widths of the pull block 19 are greater than the left and right widths of the clearance groove 18. A compression spring is provided between the pull block 19 and the baffle. A rubber pad is provided on the rear end face of the pull block 19. The compression spring can make the pull block 19 squeeze the front side wall of the square rod, so that the square tube 6 can be fixed at any height while sliding up and down relative to the support rod 3.

[0038] The support rod 3 is provided with a square groove 20 that penetrates the left and right side walls, and the square groove 20 extends upward to the upper end surface of the support rod 3. A sink groove 21 is provided on each of the left and right side walls of the rectangular block 4. A through groove 22 is provided between the bottom surfaces of the two sink grooves 21. A pressure plate 23 is provided in each sink groove 21. A cylindrical block is fixed to the side of the two pressure plates 23 facing the through groove 22. A spring is mounted on the two cylindrical blocks. The spring gives the two pressure plates 23 a force to separate from the sink groove 21 on both sides. The two pressure plates 23 face away from the through groove 22. 2 is fixed with a vertical plate on one side, and a flat plate 24 is fixed on the other end of the vertical plate; when in use, the two flat plates 24 are pressed inward so that the two pressing plates 23 are embedded in the two sinking grooves 21, and then the rectangular block 4 is slid from the upper end of the square groove 20 into the support rod 3. At this time, the flat plate 24 is located outside the support rod 3, the two vertical plates are located in the square groove 20, and the rectangular block 4 is located in the U-shaped frame of the support rod 3. The flat plates 24 on both sides are loosened, and the spring squeezes the side wall of the square rod through the pressing plate 23, thereby fixing the rectangular block 4 at a certain height on the square rod.

[0039] The clamping unit includes a circular shaft 25, which has two circular shafts 25 and is symmetrically fixed on the lower end surface of the rectangular block 4 on the rear side of the thin rod 5. An arc-shaped bent rod 26 is hinged on the circular shaft 25 on the left, and two arc-shaped bent rods 26 are hinged on the circular shaft 25 on the right. The opening directions of the bent rods 26 on both sides are opposite. A torsion spring is provided between each bent rod 26 and the circular shaft 25. The torsion spring always makes the three bent rods 26 gather toward the center, and when the three bent rods 26 gather toward the center, the bent rod 26 on the left is located between the two bent rods 26 on the right, and the upper end of the bent rod 26 on the left is on the same horizontal plane as the upper end of the thin rod 5.

[0040] A horizontal support plate 27 is provided under the base 1. When in use, the support plate 27 is in contact with the ground to improve the stability of the device. The thin shaft 2 is fixed to the upper end surface of the support plate 27, and a cylinder 28 is coaxially provided on the thin shaft 2 and the thin rod 5. The cylinder 28 can rotate relative to the thin shaft 2 or the thin rod 5, thereby reducing the friction when the tape measure 9 moves relative to the thin shaft 2 or the thin rod 5.

[0041] Working principle:

[0042] When the device is in use, the rubber block 16 is first pulled down so that the gear 12 can rotate freely, the support rod 3 is slid to the bottom of the slide groove 10, and then the base 1 is placed on one side of the rice plant to be tested, ensuring that the rice plant is located in the arc area of ​​the base 1, and the base 1 forms a semi-enclosed state for the plant. At this time, the base 1 is made more stable by lightly stepping on the support plate 27, and then the three levers are pushed to both sides to separate, and the plant is gathered between the three levers. Then the levers are released, and the upper part of the plant is grasped by the clamping unit, thereby ensuring that the plant between the clamping unit and the base 1 is in a vertical state;

[0043] If the height of the rice plant is lower than the upper end of the support rod 3 at this time, there is no need to slide the support rod 3, and the two flat plates 24 on both sides of the rectangular block 4 are directly pressed. The flat plates 24 squeeze the springs through the vertical plates and the pressure plates 23, so that the pressure plates 23 are separated from the support rod 3, and then the rectangular block 4 is dragged and slid upward relative to the support rod 3 until the tip of the rice ear is just separated from the upper right curved rod 26. At this time, the tip of the rice ear is still clamped and kept vertical by the lower right curved rod 26 and the left curved rod 26, but because the upper right curved rod 26 has been separated from the rice plant, the upper right curved rod 26 is under the action of the torsion spring. Turning left, the researcher immediately stopped dragging the rectangular block 4 after observing the bending rod 26 on the upper right side taking this action, loosened the flat plates 24 on both sides, and the two pressing plates 23 were squeezed with the support rod 3 under the action of the spring, and the rectangular block 4 and the support rod 3 were relatively fixed; and because the upper end of the thin rod 5 and the upper end of the bending rod 26 on the left side were at the same height, the value of the overlap between the outer end of the tape measure 9 and the tape measure 9 observed through the square hole 7 at this time was twice the height of the rice plant, and the smaller the diameter of the thin rod 5 and the thin shaft 2 and the distance between the thin shaft 2 and the bottom surface of the support plate 27, the smaller the error of the obtained data;

[0044] If the height of the rice plant is higher than the upper end of the support rod 3 at this time, first press the flat plates 24 on both sides of the rectangular block 4, drag the rectangular block 4 to the upper end of the support rod 3, then pull the rubber block 16 downward, and rotate the turntable 13 at the same time, so that the support rod 3 slides upward under the drive of the gear 12 rack 14, until the researcher observes that the curved rod 26 on the upper right side rotates to the left, stop rotating the turntable 13 and loosen the rubber block 16 to fix the support rod 3 on the base 1, and then observe the data of the tape measure 9 through the square hole 7. If the position of the square tube 6 is too high to read the data at this time, pull the pull block 19 forward to separate the rubber pad on the rear side of the pull block 19 from the support rod 3, and drag the square tube 6 downward until the square hole 7 is flush with the researcher's line of sight, so that it is convenient to read the data; and although the position of the square tube 6 changes during this process, the extended length of the tape measure 9 is still twice that of the rice plant, so no matter where the square tube 6 is fixed, it does not affect the final data size;

[0045] After use, pull down the rubber block 16 again, slide the support rod 3 to the bottom of the slide groove 10, pull the pull block 19 forward to move the square tube 6 to the bottom of the make way groove 18, and finally drag the rectangular block 4 to the bottom of the square groove 20. This can not only reduce the size of the device, but also shorten the extension length of the tape measure 9, avoiding long-term stress on the torsion spring on the rotating shaft 8.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Within the technical scope disclosed by the present invention, technicians familiar with the technical field can make equivalent replacements or changes based on the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rice breeding yield measuring device, characterized in that: The invention comprises a base (1), wherein the lower end of the base (1) is provided with a horizontal thin shaft (2), the upper end of the thin shaft (2) is provided with a support rod (3), the support rod (3) can slide up and down relative to the base (1) and can be fixed, the upper end of the support rod (3) is provided with a rectangular block (4), the lower end of the rectangular block (4) is fixed with a thin rod (5), the lower end of the rectangular block (4) on the rear side of the thin rod (5) is provided with a clamping unit, the clamping unit can grasp an object behind the support rod (3), and the middle part of the support rod (3) is provided with a square tube (6) with an axis in the vertical direction, and the square tube (6) can be moved along the The support rod (3) slides up and down and can be fixed. A square hole (7) is provided at the front end of the square tube (6). A rotating shaft (8) is provided inside the square tube (6). A torsion spring is provided between the rotating shaft (8) and the square tube (6). A tape measure (9) is provided on the rotating shaft (8). The torsion spring makes the tape measure (9) always have a tendency to be rolled up. The outer end of the tape measure (9) extends upward from the square tube (6), bypasses the thin rod (5) and the thin shaft (2) in sequence, and then enters the square tube (6) from the bottom and is fixed on the inner wall of the front side of the square tube (6). The end of the tape measure (9) is flush with the lower side wall of the square hole (7).

2. A rice breeding yield measuring device according to claim 1, characterized in that: The base (1) is an arc-shaped plate with an axis in a vertical direction, the opening of the arc-shaped plate faces rearward, a slide groove (10) is provided on the side wall of the arc-shaped plate, and the upper end of the slide groove (10) extends to the top surface of the arc-shaped plate; the support rod (3) is a long rod with a U-shaped cross-section, the opening of the support rod (3) faces rearward, and two clamping plates (11) are fixed on the left and right sides of the support rod (3), the four clamping plates (11) are all arc-shaped and coaxial with the arc-shaped plate, and the distance between the two clamping plates (11) on the same side of the support rod (3) is equal to the thickness of the arc-shaped plate.

3. A rice breeding yield measuring device according to claim 2, characterized in that: A short shaft is rotatably connected to the arc plate on the left side of the slide groove (10), a gear (12) is fixed on the short shaft, a turntable (13) is fixed at the front end of the gear (12), a rack (14) is fixed on the left wall of the clamping plate (11) in front of the left side of the support rod (3), the rack (14) is always meshed with the gear (12), a rectangular hole (15) is opened on the arc plate on the left side of the gear (12), the rectangular hole (15) passes through the inner and outer walls of the arc plate, and a bolt is arranged in the rectangular hole (15), the large head end of the bolt is located in the arc plate, the small head end of the bolt extends from the rectangular hole (15) to the front end of the arc plate and is fixed with a rubber block (16), a convex block is fixed on the arc plate above the rectangular hole (15), a tension spring (17) is arranged between the convex block and the rubber block (16), when the tension spring (17) pulls the rubber block (16) to the upper end of the rectangular hole (15), the rubber block (16) squeezes the gear (12) on the right side so that it cannot rotate.

4. A rice breeding yield measuring device according to claim 2, characterized in that: The front end of the support rod (3) is provided with a clearance groove (18) penetrating the front and rear side walls. The square tube (6) is located in the U-shaped frame of the support rod (3). A sliding rod with an axis along the front-to-back direction is fixed on the front side wall of the square tube (6) below the square hole (7). The front end of the sliding rod extends from the clearance groove (18) and is fixed with a baffle. A square pull block (19) is provided in the middle of the sliding rod. The left and right width of the pull block (19) is greater than the left and right width of the clearance groove (18). A compression spring is provided between the pull block (19) and the baffle. A rubber pad is provided on the rear end surface of the pull block (19).

5. A rice breeding yield measuring device according to claim 2, characterized in that: The support rod (3) is provided with a square groove (20) penetrating the left and right side walls, and the square groove (20) extends upward to the upper end surface of the support rod (3). The left and right side walls of the rectangular block (4) are each provided with a sink groove (21), and a through groove (22) is provided between the bottom surfaces of the two sink grooves (21). A pressing plate (23) is provided in each sink groove (21), and cylindrical blocks are fixed on the sides of the two pressing plates (23) facing the through groove (22). Springs are mounted on the two cylindrical blocks, and the springs give the two pressing plates (23) a force to separate from the sink groove (21) to both sides. A vertical plate is fixed on the sides of the two pressing plates (23) facing away from the through groove (22), and a flat plate (24) is fixed on the other end of the vertical plate.

6. A rice breeding yield measuring device according to claim 1, characterized in that: The clamping unit comprises a circular shaft (25), wherein two circular shafts (25) are symmetrically fixed on the lower end surface of the rectangular block (4) at the rear side of the thin rod (5), wherein an arc-shaped bent rod (26) is hingedly connected to the circular shaft (25) on the left side, and two arc-shaped bent rods (26) are hingedly connected to the circular shaft (25) on the right side, wherein the opening directions of the bent rods (26) on both sides are opposite to each other, and a torsion spring is provided between each bent rod (26) and the circular shaft (25), wherein the torsion spring always makes the three bent rods (26) gather toward the center, and when the three bent rods (26) gather toward the center, the bent rod (26) on the left side is located between the two bent rods (26) on the right side, and the upper end of the bent rod (26) on the left side is on the same horizontal plane as the upper end of the thin rod (5).

7. The rice breeding yield measuring device according to claim 1, characterized in that: A horizontal support plate (27) is provided below the base (1), the thin shaft (2) is fixed to the upper end surface of the support plate (27), and a cylinder (28) is coaxially provided on the thin shaft (2) and the thin rod (5), and the cylinder (28) can rotate relative to the thin shaft (2) or the thin rod (5).

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