A portable leaf area measuring device

Abstract

This invention discloses a portable leaf area measuring device, relating to the field of leaf area measurement technology. It includes a detection body, a measuring rope, and an emergency locking mechanism for restricting the measuring rope when it actively retracts. A bracket is provided on one side of the detection body, and a support component is mounted on the bracket. After the semi-ring detaches, the pressure rod directly presses the leaf edge down onto the bracket, thus keeping the leaf, the device body, and the pressure plate stationary for stable quantitative measurement. This avoids slippage of the measuring instrument relative to the leaf caused by the operator's body or arm movements, which could lead to overlap or offset between subsequent measurement points and the previously measured area, affecting data accuracy. It also prevents changes in the location of the device body and the length of the extended measuring rope, thus preserving the measured value and avoiding the adverse effects of requiring re-measurement after the measuring rope detaches.

Description

Technical Field

[0001] This invention relates to the field of leaf area measurement technology, specifically a portable leaf area measurement device. Background Technology

[0002] Portable live leaf area meters measure leaf area by clamping a leaf between a pressure plate and the machine body and pulling a measuring rope to complete the leaf area measurement. Due to their portability and ease of operation, they are widely used in field measurements. Their working principle is as follows: the length of the measuring rope pulled out is positively correlated with the leaf length. A displacement sensor records the data and calculates the leaf area. After the measurement is completed, the measuring rope automatically retracts through a built-in elastic mechanism for future use.

[0003] However, existing equipment has significant limitations when measuring large, highly resilient leaves, such as those of corn. Corn leaves are typically long and narrow, large in area, tough, and have a rough surface. They also have well-developed vein structures and exhibit strong mechanical strength and resilience. During measurement, these morphological and mechanical characteristics exacerbate the difficulty of using the equipment, specifically in the following two aspects:

[0004] 1. Measurement rope detachment caused by center of gravity shift

[0005] Because corn and other plants have long leaves, the measuring instrument needs to be continuously moved from the petiole towards the leaf tip during measurement. At this time, the operator must simultaneously shift their body to the right to maintain balance. However, during this adjustment, the measuring rope held in the left hand is very prone to slipping out due to body sway. Once slipped, the measuring rope automatically retracts, resulting in the loss of the current measurement data.

[0006] II. Measurement failures caused by insufficient operational coordination

[0007] The toughness of leaves such as corn requires the left hand to perform two operations simultaneously during measurement: 1. Fix the petiole to reduce leaf rebound; 2. Continuously squeeze the measuring rope to prevent it from retracting.

[0008] This dual-operation method is prone to loss of control of the measuring rope due to distraction or fatigue. Even if the retraction is paused by an emergency locking mechanism (such as a ratchet), the operator's body or arm movements can still cause the measuring instrument to slip relative to the blades, resulting in subsequent measurement points overlapping or shifting with the already measured intervals, affecting data accuracy. Figure 1 As shown, when the actual length of the blade to be measured is L3, point A is the stationary point of the measuring rope, i.e., the part near the petiole, and point B is the position of the machine body (point B moves relative to point A towards point C, and point C is the blade tip). The distance L1 between points A and B is the measured length, and the remaining length to be measured is L2 (L2+L1=L3). Figure 2As shown, when the machine moves to point B, the measuring rope is detached from the hand and locked by the emergency locking mechanism. However, at this time, the machine (point B) slides to point B1 due to the swinging of the operator's body or arm. When the machine is moved from point B1 to point C again, an overlap distance L6 will be generated. When it slides to point B2, an offset distance L7 will be generated, which will affect the measurement accuracy of the leaf area.

[0009] Based on this, the present invention designs a portable leaf area measuring device to solve the above problems. Summary of the Invention

[0010] The purpose of this invention is to provide a portable leaf area measuring device to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a portable leaf area measuring device, comprising a detection body, a measuring rope, and an emergency locking mechanism for restricting the measuring rope when it actively retracts. A bracket is provided on one side of the detection body, and a support assembly is provided on the bracket. The support assembly includes:

[0012] A pull rope, one end of which is located inside the detection body, and the pull rope automatically retracts through an elastic mechanism built into the detection body;

[0013] A semi-loop is slidably connected to the measuring rope, and the other end of the semi-loop is fixedly connected to the pull rope;

[0014] The pressure bar, with its bottom end located above the pull rope, is elastically and slidably connected to the bracket, and is used to press down the blade;

[0015] The guide frame is fixed at the bottom of the support. The guide frame is slidably connected to the pull rope. After the half ring drives the pull rope from slack to straight, it can drive the pull rope to extend outward from the inside of the detection body. When the pull rope extends outward from the inside of the detection body to the point where the half ring contacts the measuring rope, it will drive the measuring rope to extend outward from the inside of the detection body simultaneously.

[0016] Telescopic component one is set between the bracket and the pressure rod. The bottom end of the telescopic component one is fixedly connected to the bracket. After the telescopic component one is shortened to its maximum extent, the pressure rod slides down to a position where the bottom end is lower than the guide frame under the elastic action. The elastic stiffness coefficient of the elastic mechanism acting on the pull rope is greater than the elastic sliding stiffness coefficient of the guide frame. When the pull rope is straightened from a slack state, the pull rope can lift the pressure rod.

[0017] As a further embodiment of the present invention, an adjusting rod is provided on the side of the support assembly away from the detection body, and a push rod is provided on the side of the pressure rod away from the detection body. The push rod is rotatably connected to the bracket, and a sliding groove is provided on the push rod. The sliding groove is slidably connected to the adjusting rod, and the adjusting rod is elastically slidably connected to the bracket. A sliding rod is rotatably connected to the push rod, and a connecting member is rotatably connected to the sliding rod. The connecting member is slidably connected to the bracket, and a paddle is provided on the connecting member. A contact block is elastically slidably connected to the paddle. After the pressure rod slides down the bracket to its limit, it will press down on the contact block so that the contact block contacts the edge of the blade.

[0018] As a further embodiment of the present invention, the paddle is rotatably connected to the connector, and a force-bearing rod is rotatably connected to the pressure rod.

[0019] As a further embodiment of the present invention, the support components are in two sets and are symmetrically distributed about the measuring rope. After the two semi-rings in the two support components are fixedly connected, the hole formed in the middle is slidably connected to the measuring rope.

[0020] As a further embodiment of the present invention, a telescopic component 2 is provided at the bottom of the detection body, one end of the telescopic component being rotatably connected to the detection body and the other end being rotatably connected to the side wall of the support.

[0021] As a further embodiment of the present invention, the emergency locking mechanism includes a one-way gear one and a one-way gear two. The one-way gear one is rotatably connected to the side wall of the detection body, and the one-way gear two is rotatably connected to a push plate. The push plate is elastically slidably connected to the side wall of the detection body.

[0022] As a further embodiment of the present invention, a roller is rotatably provided on the adjusting rod.

[0023] As a further embodiment of the present invention, a rubber layer is fixedly connected to the bottom of the contact block.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In this invention, after the semi-ring detaches, the pressure rod directly presses the edge of the blade down onto the support, thereby keeping the blade, the machine body, and the pressure plate in a static state to stabilize the quantitative measurement. This avoids the operator's body or arm swinging, which could cause the measuring instrument to slip relative to the blade, resulting in subsequent measurement points overlapping or shifting with the measured interval, affecting data accuracy. It also prevents changes in the position of the machine body at this time and the length of the extended measuring rope, thus preserving the measured value and avoiding the impact of the measurement work failing and needing to be re-measured after the measuring rope detaches.

[0026] 2. The extension of the second retractable component, which moves the support, allows for the formation of a separate support point between the adjustment rod and the support during blade inspection. This prevents the blade from being pulled away from the machine body and pressure plate due to insufficient support on the left side as it gradually approaches the blade tip. Furthermore, the support moves gradually rather than being directly on the far left of the machine body; it extends progressively as the machine body and blade stem move further apart, thus avoiding interference with the blade stem. It also ensures that the fixing point is away from the blade tip when the measuring rope is detached and the blade is fixed, thereby ensuring effective fixation.

[0027] 3. By dynamically monitoring and controlling the thickness of the leaf stalk through the adjusting rod and the second spring, the distance between the two contact blocks is controlled, thereby overcoming the effect of the two contact blocks pressing down and fixing the leaf when the width of the leaf stalk gradually decreases as it approaches the leaf tip. Attached Figure Description

[0028] Figure 1 This is a schematic diagram showing the measured values ​​and the test parameters of the sample to be tested.

[0029] Figure 2 This is a schematic diagram showing the slippage of the machine body relative to the blades after the measurement rope is detached.

[0030] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the force-bearing rod and the contact block in the avoidance position according to the present invention;

[0032] Figure 5 This is a schematic diagram showing the positional relationship between the bracket, pressure rod, and contact block of the present invention;

[0033] Figure 6 This is a schematic diagram showing the adjustment rod of the present invention in contact with the sample to be tested;

[0034] Figure 7 This is a schematic diagram showing the positional relationship between the telescopic component 1 of the present invention and the pull rope before it is straightened and the pressure rod;

[0035] Figure 8 This is a schematic diagram of the measuring rope before the semi-ring of the present invention is straightened;

[0036] Figure 9 This is a schematic diagram of the present invention when the telescopic component of the present invention is shortened to its maximum extent after the pull rope is straightened, and the pull rope blocks the pressure bar.

[0037] Figure 10 This is a schematic diagram showing the positional relationship between the bracket and the guide frame of the present invention;

[0038] Figure 11 This is a schematic diagram showing the positional relationship between the adjustment frame, the support, and the push rod of the present invention;

[0039] Figure 12 This is a schematic diagram showing the positional relationship between the connector, the lever, and the contact block of the present invention;

[0040] Figure 13 This is a schematic diagram showing the positional relationship between the sample to be tested and the pressure plate in this invention.

[0041] Figure 14 This is a schematic diagram showing the positional relationship of the two contact blocks before the adjusting rod slides upwards in this invention;

[0042] Figure 15 This is a schematic diagram showing the positional relationship between the two contact blocks after the adjusting rod slides upwards according to the present invention;

[0043] Figure 16 This is a schematic diagram showing the positional relationship between the telescopic component 2 and the bracket of the present invention;

[0044] Figure 17 for Figure 16 A magnified view of a section at point A in the middle;

[0045] Figure 18 This is a schematic diagram showing the positional relationship between the sleeve, the spiral spring, and the winding wheel of the present invention.

[0046] In the attached diagram: 1. Detection body; 101. Machine body; 102. Pressure plate; 2. Measuring rope; 3. Pull rope; 4. Half ring; 5. Bracket; 6. Pressure rod; 7. Guide frame; 8. Telescopic component one; 9. Push rod; 10. Slide groove; 11. Adjusting rod; 12. Slide rod; 13. Connecting component; 131. Paddle; 14. Contact block; 15. Force rod; 16. Telescopic component two; 17. One-way gear one; 18. One-way gear two; 19. Push plate; 20. Roller; 21. First spring; 22. Second spring; 23. Third spring; 24. Detection module; 25. Fourth spring; 26. Sleeve; 27. Winding wheel; 28. Spiral spring; 29. ​​Sample to be tested. Detailed Implementation

[0047] Please see Figures 1-18This invention provides a technical solution: a portable leaf area measuring device, comprising a detection body 1, a measuring rope 2, and an emergency locking mechanism for restricting the measuring rope 2 when it actively retracts. The detection body 1 consists of a body 101 and a pressure plate 102 rotatably connected to the body 101. The emergency locking mechanism is disposed on the body 101. When the measuring rope 2 is pulled outward and released, the measuring rope 2 automatically retracts through an elastic mechanism built into the body 101. The retraction of the measuring rope 2 is a technology in this field. Common knowledge for personnel will not be elaborated here. A support 5 is installed on one side of the testing body 1, that is, the support 5 is located on the same side as the machine body 101 and the pressure plate 102. A support assembly is installed on the support 5, including a pull rope 3, a semi-circular ring 4, a pressure rod 6, a guide frame 7, and a telescopic component 8. The telescopic component 8 can be one of a wirelessly controlled push rod, an electric cylinder, or a pneumatic cylinder. One end of the pull rope 3 is located inside the testing body 1, and the pull rope 3 automatically retracts through the built-in elastic mechanism of the testing body 1 (achieving the same retraction as the measuring rope 2). The semi-circular ring 4 and the measuring rope 2... The sliding connection is made at one end and fixedly connected to the pull rope 3 at the other end. The bottom end of the pressure rod 6 is located above the pull rope 3. The pressure rod 6 is vertically slidably connected to the bracket 5 and a first spring 21 is fixedly connected between the pressure rod 6 and the bracket 5. The pressure rod 6 is used to press down the blade. The guide frame 7 is fixedly installed at the bottom of the bracket 5. The guide frame 7 is slidably connected to the pull rope 3. After the half ring 4 drives the pull rope 3 from slack to taut, it can drive the pull rope 3 to extend outward from inside the detection body 1. When the pull rope 3 extends outward from inside the detection body 1 and contacts the half ring 4 along the measuring rope 2, it will drive the measuring rope 2 to move synchronously from the detection body 1. The telescopic component 8 extends out from the body 1 and is located between the bracket 5 and the pressure rod 6. Its bottom end is fixedly connected to the bracket 5. After the telescopic component 8 is shortened to its maximum extent, it will disengage from the pressure rod 6. The pressure rod 6 will slide down to a position where its bottom end is lower than the guide frame 7 due to the elastic reset of the first spring 21. The elastic stiffness coefficient of the elastic mechanism acting on the pull rope 3 is greater than the elastic sliding stiffness coefficient of the guide frame 7. That is, the elastic stiffness coefficient of the first spring 21 is less than the elasticity of the elastic mechanism acting on the pull rope 3. When the pull rope 3 is straightened from the slack state, the pull rope 3 can lift the pressure rod 6.

[0048] The elastic mechanism used to automatically retract the pull rope 3 and the measuring rope 2 can be as follows: Figure 18 As shown, this retraction characteristic consists of a sleeve 26 built into the body 101, a winding wheel 27 rotating inside the sleeve 26, and a spiral spring 28 disposed between the sleeve 26 and the winding wheel 27. The pull rope 3 or measuring rope 2 can be passed through the sleeve 26 and fixed to the winding wheel 27. For those skilled in the art, the elastic mechanism composed of the sleeve 26, the winding wheel 27, and the spiral spring 28 is one type of mechanism that can achieve automatic retraction characteristics, not only this type. It is common knowledge to those skilled in the art and will not be described in detail here.

[0049] like Figure 3 , Figure 5 , Figures 6-8 As shown:

[0050] When the sample 29 to be tested is a corn leaf, manually rotate the pressure plate 102 upwards, then place the part near the petiole between the pressure plate 102 and the machine body 101 and make the pressure plate 102 clamp the leaf. After clamping, the edge of the leaf is directly below the pressure rod 6. Then, the operator holds the petiole with his left hand and pinches the semi-ring 4 while moving the machine body 101 gradually towards the leaf tip along the leaf growth direction with his right hand to measure the leaf.

[0051] like Figure 8 As shown, before the semi-ring 4 is pulled, the pull rope 3 is in a slack state. There can be two guide frames 7. When the semi-ring 4 is pulled, it will directly drive the pull rope 3 to straighten and then extend outward from the inside of the body 101. At this time, the semi-ring 4 will slide to the left along the measuring rope 2. When the semi-ring 4 moves to contact the end of the measuring rope 2, it will forcibly drive the measuring rope 2 to extend outward from the inside of the body 101. The distance between the body 101 and the measuring rope 2 is the actual measured length of the blade. When the semi-ring 4 is pulled, the telescopic component 8 is controlled by the button on the body 101. When the telescopic component 8 is shortened to its limit (after the telescopic component 8 is shortened to its limit, its top end is lower than the bottom end of the pressure rod 6 after it has descended to its limit), the elastic reset of the first spring 21 when the telescopic component 8 is shortened will cause the pressure rod 6 to slide down along the bracket 5 to the bottom. At this time, the pull rope 3 is in a taut state, and the elastic stiffness coefficient of the first spring 21 is less than the stiffness coefficient of the elastic mechanism acting on the pull rope 3. When the pressure rod 6 moves to the bottom, it will be blocked by the pull rope 3 and cannot descend, forcing the bottom of the pressure rod 6 to stay on the taut pull rope 3.

[0052] As the machine body 1 moves to the right (towards the blade tip), if the operator's center of gravity or operational coordination is insufficient, causing the semi-ring 4 to detach from the left hand, the emergency locking mechanism will lock the measuring rope 2 to prevent it from retracting and causing changes in the measurement data. When the pull rope 3 retracts, it will move the semi-ring 4 and the end of the measuring rope 2. During the retraction of the pull rope 3, it will become slack. At this time, under the elastic reset action of the first spring 21, the pressure rod 6 will instantly descend to its maximum extent. After the pressure rod 6 has descended completely, its top will directly press the blade edge onto the bracket 5, thus keeping the blade, machine body 101, and pressure plate 102 in a stationary state. This prevents the operator's body or arm from swinging and causing the measuring instrument to become detached from the blade. Slippage can occur, causing subsequent measurement points to overlap or shift with the measured interval, affecting data accuracy. When the blade is fixed by the pressure rod 6, if the operator's arm swings, it will only cause the blade to tilt when the machine body 1 moves, without affecting the change in the position of the machine body 101 or the length of the extended measuring rope 2. This ensures that the measurement result remains valid and the measured value can be directly fixed instead of changing. When the operator picks up the half ring 4 and pulls it again, the rope 3 will be straightened, directly lifting the pressure rod 6 and releasing the pressure rod 6 from fixing the blade. The measurement work can then be started again, thus avoiding the problem of the measurement work failing and needing to be re-measured after the measuring rope 2 comes off.

[0053] If the blade comes loose again while the semi-ring 4 is being pulled to measure again until the measurement of the blade is completed, the pressure rod 6 can fix the blade again until the measurement is completed.

[0054] Once the measurement is complete, simply release the emergency locking mechanism from locking the measuring rope 2 to allow the measuring rope 2 to retract directly into the body 101.

[0055] In this invention, after the semi-ring 4 is detached, the pressure rod 6 directly presses the edge of the blade down onto the support 5, thereby keeping the blade 5, the machine body 101, and the pressure plate 102 in a static state to stabilize the quantitative measurement. This avoids the operator's body or arm swinging, which could cause the measuring instrument to slip relative to the blade, resulting in subsequent measurement points overlapping or shifting with the measured interval, affecting the accuracy of the data. It also prevents changes in the position of the machine body 101 at this time and changes in the length of the extended measuring rope 2, thus retaining the measured value of this measurement. This avoids the impact of the measurement work failing and needing to be re-measured after the measuring rope 2 is detached.

[0056] An adjusting rod 11 is provided on the side of the support assembly away from the detection body 1, and a push rod 9 is provided on the side of the pressure rod 6 away from the detection body 1. The push rod 9 is rotatably connected to the bracket 5. A sliding groove 10 is provided on the push rod 9, and the sliding groove 10 is slidably connected to the adjusting rod 11. The adjusting rod 11 is slidably connected to the bracket 5 and a second spring 22 is fixedly connected between the adjusting rod 11 and the bracket 5. A sliding rod 12 is rotatably connected to the push rod 9, and a connecting piece 13 is rotatably connected to the sliding rod 12. The connecting piece 13 is slidably connected to the bracket 5, and a paddle 131 is provided on the connecting piece 13. A contact block 14 is slidably connected to the paddle 131, and a third spring 23 is fixedly connected between the contact block 14 and the paddle 131. After the pressure rod 6 slides down the bracket 5 to its limit, it will press down on the contact block 14 so that the contact block 14 contacts the edge of the blade.

[0057] The lever 131 is rotatably connected to the connector 13, and the force-bearing rod 15 is rotatably connected to the pressure rod 6.

[0058] There are two sets of support components, which are symmetrically distributed about the measuring rope 2. After the two semi-rings 4 in the two support components are fixedly connected, the hole formed in the middle is slidably connected to the measuring rope 2.

[0059] like Figures 3-6 , Figures 9-16 As shown:

[0060] Before the blades are clamped by the body 101 and the pressure plate 102, manually move the lever 131 and the force rod 15 from... Figure 3 Rotate as shown Figure 4 Rotate to the state shown in the image until... Figure 4 As shown, the lever 131 is vertical (or relatively vertical, or the bracket can be rotated to a horizontal position) and remains stationary through its own friction. The force-bearing rod 15, after rotating, also remains stationary through its own friction. At this time, the force-bearing rod 15 and the lever 131 will create a clearance for the blade, making it easier to place the blade on the body 101, pressure plate 102, and bracket 5. After the blade is placed, the lever 131 and the force-bearing rod 15 rotate to the position shown. Figure 3 As shown, at this time the force-bearing rod 15 is above the contact block 14;

[0061] After the blade is placed and clamped by the body 101 and the pressure plate 102, its end near the petiole will be above the adjusting rod 11. After the body 101 and the pressure plate 102 clamp the blade, they will press the blade down onto the adjusting rod 11. The thickness of the petiole is greater at the part of the blade that is closest to the petiole, which pushes the adjusting rod 11, causing it to slide down the bracket 5 and compress the second spring 22. As the body 101 moves towards the blade tip, the thickness of the petiole gradually decreases, and usually disappears in the middle of the blade. That is, as the body 101 moves towards the blade tip and the thickness of the petiole gradually decreases, the second spring 22 will gradually drive the adjusting rod 11 to slide up the bracket 5. When the adjusting rod 11 slides up, its end will slide inside the slide groove 10 and push the push rod 9 to rotate. The rotation of the push rod 9 will push the connecting piece 13 to slide along the bracket 5 through the slide rod 12, thereby causing the two connecting pieces 13 and the contact block 14 to gradually move closer. Figure 14 This is a schematic diagram of the adjusting rod 11 before it slides upwards. At this time, the distance between the two connecting parts 13 is L8. Figure 15 This is a schematic diagram of the adjusting rod 11 sliding upwards. At this time, the distance between the two connecting parts 13 is L9 (L9 < L8). When the two connecting parts 13 and the contact block 14 approach each other, they will gradually approach the leaf stalk from the edge of the blade to the middle. As the thickness of the leaf stalk decreases, the two contact blocks 14 approach each other to overcome the downward pressing and fixing effect of the two contact blocks 14 on the blade when the width of the leaf stalk gradually decreases as it approaches the blade tip.

[0062] Furthermore, when the measuring rope 2 falls off, the elasticity of the pressure rod 6 decreases, which will squeeze the contact block 14 through the force rod 15, causing the contact block 14 to slide along the connector 13 to press down and fix the blade. The rubber layer at the bottom of the contact block 14 is used to prevent the blade from being damaged when the blade is pressed down firmly.

[0063] The distance between the two contact blocks 14 is dynamically monitored and controlled by the adjusting rod 11 and the second spring 22 to overcome the effect of the two contact blocks 14 pressing down on the leaf blade when the width of the leaf petiole gradually decreases as it approaches the leaf tip.

[0064] The bottom of the detection body 1 is provided with a telescopic component 11. One end of the telescopic component 11 is rotatably connected to the body 101 and the other end is rotatably connected to the side wall of the support 5.

[0065] like Figure 6 , Figure 7 , Figure 10 and 16 As shown:

[0066] A detection module 24 is installed below the force-bearing rod 15. When the measuring rope 2 is stretched, it indicates that the normal detection of the blade has begun. During the pulling of the measuring rope 2, the intelligent control unit on the machine body 101 controls the telescopic component 2 16 to gradually extend. The telescopic component 2 16 can be one of a wirelessly controlled push rod, electric cylinder, or pneumatic cylinder. During the extension of the telescopic component 2 16, its telescopic end will gradually push the bracket 5 to slide along the machine body 101, so that the bracket 5 gradually moves away from the machine body 101 and the pressure plate 102. It is worth noting that the telescopic component 24 will not be locked in an emergency when the measuring rope 2 is not locked. The second telescopic component 16 will gradually extend until it reaches its maximum length and then stop. If the measuring rope 2 stops extending before the telescopic component 16 reaches its maximum length, the pressure rod 6 will descend and press down on the contact block 14 through the force rod 15 to fix the blade. At this time, the detection module 24 will be in contact with the contact block 14 and control the telescopic component 16 to stop extending. Until the measuring rope 2 and the pull rope 3 are pulled again to make the pressure rod 6 drive the force rod 15 to rise until it is separated from the contact block 14, the detection module 24 will be separated from the contact block 14. At this time, the intelligent control unit will continue to control the telescopic component 16 to extend until it reaches its maximum length.

[0067] The extension of the telescopic component 16 causes the support 5 to move. When the blade is being tested, the adjustment rod 11 and the support 5 form a separate support point. This is to prevent the blade from being pulled away from the body 101 and the pressure plate 102 due to insufficient support on the left side when it gradually approaches the blade tip. The support 5 moves gradually rather than being directly on the left side of the body 101. Instead, it extends gradually as the body 101 moves away from the blade stem, thus avoiding interference with the blade stem. It also ensures that the fixing point of the two contact blocks 14 is away from the blade tip when the measuring rope 2 is detached and the blade is fixed, thus ensuring effective fixing.

[0068] The emergency locking mechanism includes a one-way gear 17 and a one-way gear 18. The one-way gear 17 is rotatably connected to the side wall of the detection body 1. The one-way gear 18 is rotatably connected to a push plate 19. The push plate 19 is slidably connected to the side wall of the machine body 101. A fourth spring 25 is fixedly connected to the push plate 19 and the side wall of the machine body 101.

[0069] like Figure 17 As shown, when the one-way gear 17 and the one-way gear 2 mesh, they compress the measuring rope 2. When the measuring rope 2 is disengaged, the one-way gear 17 and the one-way gear 2 restrict the retraction of the measuring rope 2 due to the restriction of the rotation direction, thus achieving an emergency lock on the measuring rope 2. After the measurement is completed, the push plate 19 can be manually pushed to slide up along the machine body 101. When the push plate 19 is released, the fourth spring 25 causes the push plate 19 to descend.

[0070] A roller 20 is rotatably mounted on the adjusting rod 11.

[0071] like Figure 14 and Figure 15 As shown:

[0072] The roller 20 is used to reduce friction when the blade slides along the adjusting rod 11, thereby avoiding damage to the blade.

Claims

1. A portable leaf area measuring device, comprising a detection body (1), a measuring rope (2), and an emergency locking mechanism for restricting the measuring rope (2) when it actively retracts, characterized in that, A bracket (5) is provided on one side of the detection body (1), and a support component is provided on the bracket (5). The support component includes: Pull rope (3), one end of which is located inside the detection body (1) and the automatic retraction of the pull rope (3) is achieved through the built-in elastic mechanism of the detection body (1); A half-ring (4) is slidably connected to the measuring rope (2), and the other end of the half-ring (4) is fixedly connected to the pull rope (3); The pressure rod (6) has its bottom end located above the pull rope (3). The pressure rod (6) is elastically slidably connected to the bracket (5). The pressure rod (6) is used to press down on the blade. The guide frame (7) is fixed at the bottom of the bracket (5). The guide frame (7) is slidably connected to the pull rope (3). After the half ring (4) drives the pull rope (3) from slack to straight, it can drive the pull rope (3) to extend outward from the inside of the detection body (1). When the pull rope (3) extends outward from the inside of the detection body (1) to the point that the half ring (4) contacts the measuring rope (2), it will drive the measuring rope (2) to extend outward from the inside of the detection body (1) at the same time. Telescopic component 1 (8) is set between the bracket (5) and the pressure rod (6). The bottom end of the telescopic component 1 (8) is fixedly connected to the bracket (5). After the telescopic component 1 (8) is shortened to the maximum extent, the pressure rod (6) slides down to a position where the bottom end is lower than the guide frame (7) under the elastic action. The elastic stiffness coefficient of the elastic mechanism acting on the pull rope (3) is greater than the stiffness coefficient of the elastic sliding of the guide frame (7). When the pull rope (3) is straightened from the slack state, the pull rope (3) can lift the pressure rod (6).

2. The portable leaf area measuring device according to claim 1, characterized in that: An adjusting rod (11) is provided on the side of the support assembly away from the detection body (1), and a push rod (9) is provided on the side of the pressure rod (6) away from the detection body (1). The push rod (9) is rotatably connected to the bracket (5). A sliding groove (10) is provided on the push rod (9). The sliding groove (10) is slidably connected to the adjusting rod (11). The adjusting rod (11) is elastically slidably connected to the bracket (5). A sliding rod (12) is rotatably connected to the push rod (9). A connecting piece (13) is rotatably connected to the sliding rod (12). The connecting piece (13) is slidably connected to the bracket (5). A paddle (131) is provided on the connecting piece (13). A contact block (14) is elastically slidably connected to the paddle (131). After the pressure rod (6) slides down the bracket (5) to its limit, it will press down on the contact block (14) so ​​that the contact block (14) contacts the edge of the blade.

3. The portable leaf area measuring device according to claim 2, characterized in that: The lever (131) is rotatably connected to the connector (13), and a force-bearing rod (15) is rotatably connected to the pressure rod (6).

4. A portable leaf area measuring device according to claim 2, characterized in that: The support components are in two sets, and the two sets of support components are symmetrically distributed about the measuring rope (2). The two semi-rings (4) in the two support components are fixedly connected and then slidably connected to the measuring rope (2) through the hole formed in the middle.

5. A portable leaf area measuring device according to claim 2, characterized in that: The bottom of the detection body (1) is provided with a telescopic component two (16), one end of which is rotatably connected to the detection body (1) and the other end is rotatably connected to the side wall of the bracket (5).

6. A portable leaf area measuring device according to claim 1, characterized in that: The emergency locking mechanism includes a one-way gear one (17) and a one-way gear two (18). The one-way gear one (17) is rotatably connected to the side wall of the detection body (1), and the one-way gear two (18) is rotatably connected to a push plate (19). The push plate (19) is elastically slidably connected to the side wall of the detection body (1).

7. A portable leaf area measuring device according to claim 2, characterized in that: A roller (20) is rotatably mounted on the adjusting rod (11).

8. A portable leaf area measuring device according to claim 2, characterized in that: A rubber layer is fixedly connected to the bottom of the contact block (14).

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