Crop stalk thickness sensor

Abstract

The invention discloses a crop stalk thickness sensor, relates to the technical field of stalk outer diameter detection, and aims to solve the problem that the thickness and length of crop stalks cannot be detected simultaneously in the prior art. Comprising a sensor body, a mounting rack, a clamping assembly, a diameter detection assembly and a length detection assembly, the clamping assembly comprises an upper clamping piece, a lower clamping piece and a detection plate, the upper clamping piece and the lower clamping piece are vertically arranged and fixed on the mounting rack, and the diameter detection assembly comprises a screw rod, a horizontal displacement sensor, a fixed shell, a pressure measuring head and a telescopic rod. One end of the screw rod is rotatably connected with the mounting frame, the other end of the screw rod is movably provided with a movable sleeve, the movable sleeve is fixedly connected with the detection plate, and the horizontal displacement sensor is fixed on the mounting frame and used for sensing the position of the movable sleeve; the length detection assembly comprises a measuring ruler, an extension ruler and a measuring plate. The diameter detection assembly is used for detecting the thickness of the stalk, and the length detection assembly is used for detecting the length of the stalk.

Description

Technical Field

[0001] The present invention relates to the technical field of stem outer diameter detection, and specifically to a crop stem thickness sensor. Background Art

[0002] The thickness of crop stems can be used to evaluate the growth status of crops, and the thickness of crop stems is usually detected using sensors. A stem diameter micro-change sensor with the application number 2020224124030 can press against the stem from both sides through a second L-shaped fixing plate and two clamping plates, which can effectively ensure the stability of stem fixation. Secondly, by adding a second screw and a first L-shaped fixing plate, by rotating the second screw, the first L-shaped fixing plate can be stably moved left and right, and thus the distance between the detection end and the abutting end can be freely adjusted. A micro stem flow sensor for small plant stems with the application number 2022117049857 uses a flexible material to adaptively adhere to the surface of the plant stem. By arranging the micro temperature measurement module and the heating module on both sides of the stem, direct interference of the heating module on the temperature measurement module is avoided, while improving the measurement accuracy and reducing the overall size of the sensor, and it can non-destructively measure the runoff rate of plants with slender stems and extremely short internodes. A stem sensor with the application number 2018204981734 solves the problems of complex structure of the current stem sensor, lack of initial value position adjustment and stem clamping function by setting a guide hole, a U-shaped clamp, a displacement electric measuring instrument, a T-shaped adjusting clamping plate and an inverted V-shaped groove.

[0003] Although the above-mentioned prior arts solve the problem of detecting the thickness of crop stems, there are still the following defects: Since the prior arts are all set as fixed structures, it is not convenient to maintain the internal components; they can only detect the thickness of crop stems and cannot detect the change in the length of crop stems, and thus the change rules of the thickness and length of crop stems cannot be understood. Summary of the Invention

[0004] The purpose of the present invention is to provide a crop stem thickness sensor to solve the problem in the prior art that the thickness and length of crop stems cannot be detected simultaneously.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: a crop stalk thickness sensor, which includes a sensor body, a mounting bracket, a clamping assembly, a diameter detection assembly and a length detection assembly. The clamping assembly includes an upper clamping member, a lower clamping member and a detection plate. The upper clamping member and the lower clamping member are arranged up and down and fixed on the mounting bracket. The diameter detection assembly includes a screw rod, a horizontal displacement sensor, a nut, a fixed shell, a pressure probe and a telescopic rod. One end of the screw rod is rotatably connected to the mounting bracket, and a movable sleeve is movably arranged at the other end of the screw rod. The nut is arranged at the other end of the screw rod, and the movable sleeve is fixedly connected to the detection plate. The horizontal displacement sensor is fixed on the mounting bracket to sense the position of the movable sleeve. When in use, the stalk is placed between the detection plate and the upper and lower clamping members, and the nut is rotated to limit the position of the movable sleeve. The fixed shell is fixedly connected to the mounting bracket, the telescopic rod is slidably arranged in the fixed shell, and there is a detection spring between the telescopic rod and the inner wall of the fixed shell. The pressure probe is located at the end of the telescopic rod and outside the fixed shell. When the detection spring is in its natural length, the length of the telescopic rod extending out of the fixed shell is the largest. The pressure probe and the horizontal displacement sensor are both signal-connected to the sensor body. The length detection assembly includes a measuring ruler, an extension ruler and a measuring plate. The measuring ruler is fixedly connected to the upper clamping member. The lower end of the extension ruler is slidably connected to the measuring ruler up and down. The measuring plate is fixed on the top of the extension ruler, and a length displacement sensor is arranged on the measuring plate. The length displacement sensor is used to sense the distance of the measuring plate relative to the upper clamping member.

[0006] Further, the upper clamping member, the lower clamping member, the detection plate and the measuring plate are all of arc-shaped structures, and rubber members are arranged on the inner walls of the upper clamping member and the lower clamping member.

[0007] Further, an arc-shaped clamping plate is arranged on the detection plate. A buffer pad with an arc shape is arranged on the inner side of the clamping plate, and a buffer spring is arranged between the buffer pad and the clamping plate.

[0008] Further, a hanging ear is arranged at the top of the clamping plate. The hanging ear is hung upside down on the detection plate, and a bolt is installed between the hanging ear and the detection plate to realize the relative fixed connection between the clamping plate and the detection plate.

[0009] Further, a support cylinder is fixed on the measuring plate. A sliding plate is slidably installed in the support cylinder. There is a pressing spring between the sliding plate and the inner wall of the support cylinder. When the pressing spring is in its natural length, the length of the connecting rod extending out of the support cylinder is the largest. A protective pad located inside the measuring plate is arranged at the end of the connecting rod.

[0010] Further, a microprocessor, a data memory and a wireless communication module are arranged inside the sensor body. The microprocessor is signal-connected to the data memory, and the data memory is signal-connected to the wireless communication module.

[0011] Furthermore, the top of the sensor body is provided with a shell cover, one end of the shell cover is hingedly connected to the sensor body, and a shell cover locking mechanism is provided between the other end of the shell cover and the sensor body; after the shell cover locking mechanism locks the other end of the shell cover with the sensor body, the shell cover shields and seals the microprocessor, data storage device and wireless communication module.

[0012] Furthermore, the shell cover locking mechanism includes a fixed rod, a sliding seat, a support rod and a locking rod, the fixed rod is fixed to the side wall of the sensor body, the sliding seat has two and is slidably arranged on the fixed rod, the two sliding seats are connected by a strong spring, the support rods are two corresponding to the sliding seats, the support rods are fixedly connected to the corresponding sliding seats, and the locking rod is fixed to the end of the support rod; when the strong spring is at a natural length, the locking rod is inserted into the other end of the shell cover to lock the shell cover; the sliding seat is pushed to both sides so that the locking rod moves out of the shell cover to release the lock of the shell cover.

[0013] Furthermore, the shell cover is provided with a solar panel, and the solar panel absorbs solar energy and converts it into electrical energy to provide electrical energy for the entire sensor body.

[0014] Furthermore, the upper clamping member, the detection plate and the lower clamping member are located at different heights.

[0015] The beneficial effects of the present invention are as follows: when the present invention is used, the stems are clamped by the cooperation of the upper clamping member, the lower clamping member and the detection plate. After the stems are clamped, as the crop grows, the stems gradually become thicker, and then the buffer pad inside the detection plate is squeezed to move it to one side of the detection plate, so that the buffer spring is compressed, and then the stems are kept clamped as the stems become thicker; at the same time, the stem squeezes the pressure probe to compress the detection spring, and then the change in stem thickness is sensed through the pressure probe; the provision of the length detection component can facilitate rapid detection of stem length, and then the change pattern of stem thickness and length can be understood by detecting the thickness and length of the stems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of the present invention; Figure 2 One of the three-dimensional diagrams of the sensor body of the present invention; Figure 3 for Figure 2 A local enlarged view of point A in FIG. Figure 4 The second three-dimensional diagram of the sensor body of the present invention; Figure 5 A three-dimensional diagram of the shell cover and the shell cover locking mechanism; Figure 6 for Figure 5Partial enlarged view at location B in Figure 7 3D view of the clamping component of the present invention; Figure 8 Exploded view of the detection plate and the clamping plate of the present invention; Figure 9 3D view of the length detection component of the present invention; Figure 10 is Figure 9 Partial enlarged view at location C in Figure 11 Internal structure diagram of the fixed housing; Figure 12 3D view of the length measurement plate; Figure 13 3D view of the present invention in the working state; In the figure: 1, sensor body; 2, mounting bracket; 3, housing cover; 4, solar panel; 5, microprocessor; 6, data memory; 7, wireless communication module; 8, mounting plate; 9, horizontal displacement sensor; 10, screw; 11, moving sleeve; 12, nut; 13, detection plate; 14, clamping plate; 141, hanging ear; 15, bolt; 16, buffer cavity; 17, buffer spring; 18, buffer pad; 19, lower clamping member; 20, upper clamping member; 21, fixed housing; 22, moving plate; 23, telescopic rod; 24, pressure probe; 25, detection spring; 26, measuring scale; 27, extension scale; 28, measuring plate; 29, length displacement sensor; 30, support cylinder; 31, pressing spring; 32, sliding plate; 33, connecting rod; 34, protective pad; 35, fixed rod; 36, sliding seat; 37, support rod; 38, locking rod; 39, hinge rod; 40, ear plate; 41, torsion spring; 42, transmission line; 43, strong spring; 44, stalk. Detailed implementation manners

[0017] As Figures 1 to 13 shown, the present invention includes a sensor body 1, a mounting bracket 2, a housing cover 3, a solar panel 4, a microprocessor 5, a data memory 6, a wireless communication module 7, a diameter detection component and a length detection component. The structure, working principle and usage method of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] As Figures 1 to 13 shown, the crop stalk thickness sensor includes a sensor body 1, a mounting bracket 2, a clamping component, a diameter detection component and a length detection component. As Figure 1 , Figure 7As shown, the clamping assembly includes an upper clamping member 20, a lower clamping member 19, and a detection plate 13. The upper clamping member 20 and the lower clamping member 19 are arranged up and down and fixed on the mounting bracket 2. To achieve this, a mounting plate 8 is fixed on the mounting bracket 2. The upper clamping member 20 is fixedly connected to the upper end of the mounting plate 8 through a rod, and the lower clamping member 19 is fixedly connected to the lower end of the mounting plate 8 through a rod. As Figure 1 shown, the diameter detection assembly includes a screw rod 10, a horizontal displacement sensor 9, a nut 12, a fixed shell 21, a pressure probe 24, and a telescopic rod 23. One end of the screw rod 10 is rotatably connected to the mounting bracket 2, and a movable sleeve 11 is movably arranged at the other end of the screw rod 10. The movable sleeve 11 moves along the screw rod 10. The nut 12 is arranged at the other end of the screw rod 10. The movable sleeve 11 is fixedly connected to the detection plate 13. The horizontal displacement sensor 9 is fixed on the mounting bracket 2 to sense the position of the movable sleeve 11. During use, as Figure 13 shown, the stalk 44 is placed between the detection plate 13, the upper clamping member 20, and the lower clamping member 19. The nut 12 is rotated to squeeze the movable sleeve 11 to move, and at this time the detection plate 13 moves with the movable sleeve 11. When the detection plate 13, the upper clamping member 20, and the lower clamping member 19 all come into contact with the stalk, when the nut 12 is rotated to contact the movable sleeve 11, the limit of the movable sleeve 11 is achieved. The horizontal displacement sensor 9 is used to sense the position of the movable sleeve 11.

[0019] As Figure 1 、 Figure 7 and Figure 11 shown, the fixed shell 21 is fixedly connected to the mounting bracket 2. As Figure 11 shown, the telescopic rod 23 is slidably arranged in the fixed shell 21. There is a detection spring 25 between the telescopic rod 23 and the inner wall of the fixed shell 21. The pressure probe 24 is located at the end of the telescopic rod 23 and outside the fixed shell 21. To achieve the sliding of the telescopic rod 23 in the fixed shell 21, a movable plate 22 is fixed at one end of the telescopic rod 23, and the movable plate 22 is slidably connected to the inner cavity of the fixed shell 21. One end of the detection spring 25 is fixedly connected to the inner wall of the fixed shell 21, and the other end of the detection spring 25 is fixedly connected to the movable plate 22, and the detection spring 25 is sleeved on the telescopic rod 23. When the detection spring 25 is in its natural length, the length of the telescopic rod 23 extending out of the fixed shell 21 is the largest. The pressure probe 24 and the horizontal displacement sensor 9 are both signal-connected to the sensor body 1 through a transmission line 42. The data detected by the pressure probe 24 and the horizontal displacement sensor 9 are transmitted to the microprocessor 5 through the transmission line 42. The microprocessor 5 processes the data and uploads it to the data memory 6 for storage. The data in the data memory 6 is regularly uploaded through the wireless communication module 7 so that researchers can timely understand the change in the thickness of the stalk. As Figure 4 shown, the microprocessor 5, the data memory 6, and the wireless communication module 7 are all located in the sensor body 1. The microprocessor 5 is signal-connected to the data memory 6, and the data memory 6 is signal-connected to the wireless communication module 7.

[0020] As Figure 1 、 Figure 9 shown, the length detection component includes a measuring ruler 26, an extension ruler 27 and a measuring plate 28. The measuring ruler 26 is fixedly connected to the upper clamping member 20. As Figure 9 、 Figure 10 shown, the lower end of the extension ruler 27 is slidably connected to the upper and lower parts of the measuring ruler 26. The measuring plate 28 is fixed to the top of the extension ruler 27. The measuring plate 28 is provided with a length displacement sensor 29, which is used to sense the distance between the measuring plate 28 and the upper clamping member 20. In addition to passing through the upper clamping member 20 and being fixedly connected to the upper clamping member 20, the measuring ruler 26 also passes through the lower clamping member 19 and is fixedly connected to the lower clamping member 19, thereby ensuring the stability of the measuring ruler 26. Adjust the position of the measuring plate 28 to reach the required position. At this time, the relative position between the measuring plate 28 and the upper clamping member 20 can be sensed through the length displacement sensor 29, and then the length change of the stem can be understood. There is an inevitable connection and law between the thickness change and the length change of the crop stem. Therefore, by detecting the thickness and length of the stem, the growth law of the crop can be understood.

[0021] To avoid damaging the stem caused by squeezing the stem, as Figure 1 、 Figure 7 and Figure 8 shown, the detection plate 13 is provided with an arc-shaped clamping plate 14. The inner side of the clamping plate 14 is provided with an arc-shaped buffer pad 18. There is a buffer spring 17 between the buffer pad 18 and the clamping plate 14. To facilitate the assembly of the clamping plate 14 and the detection plate 13, the top of the clamping plate 14 is provided with a hanging ear 141, which is hung upside down on the detection plate 13. A bolt 15 is installed between the hanging ear 141 and the detection plate 13 to realize the relative fixed connection between the clamping plate 14 and the detection plate 13. When the buffer spring 17 is in its natural length, the distance between the buffer pad 18 and the clamping plate 14 is the largest. A buffer cavity 16 is formed between the clamping plate 14 and the buffer pad 18. As the stem thickens, the stem squeezes the buffer pad 18, causing the width of the buffer cavity 16 to narrow.

[0022] As Figure 12 shown, a support cylinder 30 is fixed on the measuring plate 28. A slide plate 32 is slidably installed in the support cylinder 30. There is a close-fitting spring 31 between the slide plate 32 and the inner wall of the support cylinder 30. A connecting rod 33 is fixed on the slide plate 32. When the close-fitting spring 31 is in its natural length, the length of the connecting rod 33 extending out of the support cylinder 30 is the largest. The end of the connecting rod 33 is provided with a protective pad 34 located inside the measuring plate 28. The protective pad 34 is used to contact the stem, thereby reducing the squeezing force and friction force with the stem.

[0023] To facilitate clamping of the stems, the upper clamping member 20, the lower clamping member 19, the detection plate 13, the clamping plate 14, the buffer pad 18 and the measuring plate 28 are all arc-shaped structures, and the inner walls of the upper clamping member 20 and the lower clamping member 19 have rubber parts to reduce the squeezing of the upper clamping member 20 and the lower clamping member 19 on the stems and avoid squeezing damage to the stems.

[0024] To facilitate the protection of the microprocessor 5, the data storage 6 and the wireless communication module 7, as shown in FIG. Figure 1 As shown, the top of the sensor body 1 has a shell cover 3, one end of the shell cover 3 is hingedly connected to the sensor body 1, and a shell cover locking mechanism is provided between the other end of the shell cover 3 and the sensor body 1. To facilitate the assembly of the shell cover 3, as shown in FIG. Figure 3 As shown, one end of the shell cover 3 has an ear plate 40, and a hinge rod 39 is fixed on the sensor body 1. The ear plate 40 is rotatably connected to the hinge rod 39, thereby realizing a hinge connection between the shell cover 3 and the sensor body 1. Figure 5 , Figure 6 As shown, a torsion spring 41 is sleeved on the hinge rod 39, one end of the torsion spring 41 is fixedly connected to the sensor body 1, and the other end of the torsion spring 41 is fixedly connected to the shell cover 3, thereby achieving pre-tightening between the shell cover 3 and the sensor body 1. When the torsion spring is in a natural state, the shell cover 3 is buckled on the top of the sensor body 1.

[0025] After the cover locking mechanism locks the other end of the cover 3 with the sensor body 1, the cover 3 shields and seals the microprocessor 5, the data storage 6 and the wireless communication module 7. Figure 2 As shown, the shell cover locking mechanism includes a fixed rod 35, a slide 36, a support rod 37 and a locking rod 38. The fixed rod 35 is fixed to the side wall of the sensor body 1. The slide 36 has two and is slidably arranged on the fixed rod 35. The two slides 36 are connected by a strong spring 43. There are two support rods 37 corresponding to the slides 36 one by one. The support rods 37 are fixedly connected to the corresponding slides 36, and the locking rod 38 is fixed to the end of the support rod 37. When the strong spring 43 is at its natural length, the locking rod 38 is inserted into the other end of the shell cover 3 to lock the shell cover 3; the slide 36 is moved to both sides so that the locking rod 38 moves out of the shell cover 3 to release the lock of the shell cover 3.

[0026] To obtain electrical energy, Figure 1 As shown, the shell cover 3 is provided with a solar panel 4 , which absorbs solar energy and converts it into electrical energy to provide electrical energy for the entire sensor body 1 .

[0027] To ensure the clamping stability between the clamping assembly and the stem, Figure 1 As shown, the upper clamping member 20, the detection plate 13 and the lower clamping member 19 are located at different heights.

[0028] The working principle of the present invention is described below: (1)During use, place the stalk 44 between the detection plate 13, the upper clamping member 20 and the lower clamping member 19, so that the stalk 44 contacts the buffer pad 18 and the rubber members on the upper clamping member 20 and the lower clamping member 19; (2) Place the sensor body 1 in a suitable position to ensure that the solar panel 4 can receive sunlight; (3) During the growth process of the crop, the pressure probe 24 and the horizontal displacement sensor 9 are started for detection at regular intervals, and then the change in the thickness of the stalk is detected; when it is necessary to detect the length of the stalk, move the measuring plate 28 to the highest point of the stalk, and detect the stalk length through the length displacement sensor 29; or, under the action of the close spring 31, the protective pad 34 remains in contact with the stalk. When the stalk grows, the protective pad 34 is pulled to move, and then the measuring plate 28 moves accordingly. Thus, without human intervention, the length of the stalk can be detected regularly through the length displacement sensor 29.

[0029] During the use of the present invention, the clamping of the stalk is realized through the combined action of the upper clamping member 20, the lower clamping member 19 and the detection plate 13. After clamping the stalk, as the crop grows, the stalk gradually becomes thicker, and then squeezes the buffer pad 18 inside the detection plate 13 to move it to one side of the detection plate 13, so that the buffer spring 17 is compressed, and then the clamping of the stalk is maintained as the stalk becomes thicker; at the same time, the stalk squeezes the pressure probe 24 to compress the detection spring 25, and then the change in the thickness of the stalk is sensed through the pressure probe 24; the setting of the length detection component can facilitate the rapid detection of the stalk length, and then by detecting the thickness and length of the stalk, the change rules of the stalk thickness and length can be understood.

Claims

1. Crop stem thickness sensor, characterized in that, It includes a sensor body, a mounting bracket, a clamping assembly, a diameter detection assembly, and a length detection assembly. The clamping assembly includes an upper clamping member, a lower clamping member, and a detection plate. The upper clamping member and the lower clamping member are arranged up and down and fixed on the mounting bracket. The diameter detection assembly includes a screw rod, a horizontal displacement sensor, a nut, a fixed shell, a pressure probe, and a telescopic rod. One end of the screw rod is rotatably connected to the mounting bracket, and a movable sleeve is movably arranged at the other end of the screw rod. The nut is arranged at the other end of the screw rod, and the movable sleeve is fixedly connected to the detection plate. The horizontal displacement sensor is fixed on the mounting bracket to sense the position of the movable sleeve. When in use, the stalk is placed between the detection plate and the upper and lower clamping members, and the nut is rotated to limit the position of the movable sleeve. The fixed shell is fixedly connected to the mounting bracket, the telescopic rod is slidably arranged in the fixed shell, and there is a detection spring between the telescopic rod and the inner wall of the fixed shell. The pressure probe is located at the end of the telescopic rod and outside the fixed shell. When the detection spring is in its natural length, the length of the telescopic rod extending out of the fixed shell is the largest. The pressure probe and the horizontal displacement sensor are both signal-connected to the sensor body. The length detection assembly includes a measuring scale, an extension scale, and a measuring plate. The measuring scale is fixedly connected to the upper clamping member, the lower end of the extension scale is slidably connected to the measuring scale up and down, the measuring plate is fixed on the top of the extension scale, and a length displacement sensor is provided on the measuring plate. The length displacement sensor is used to sense the distance between the measuring plate and the upper clamping member.

2. The crop stalk thickness sensor according to claim 1, wherein The upper clamping member, the lower clamping member, the detection plate, and the measuring plate are all arc-shaped structures, and rubber members are provided on the inner walls of the upper clamping member and the lower clamping member.

3. The crop stalk thickness sensor according to claim 2, characterized in that, The detection plate is provided with an arc-shaped clamping plate, and an arc-shaped buffer pad is provided on the inner side of the clamping plate. There is a buffer spring between the buffer pad and the clamping plate.

4. The crop stalk thickness sensor according to claim 3, characterized in that, The top of the clamping plate is provided with a hanging ear, the hanging ear is hung upside down on the detection plate, and a bolt is installed between the hanging ear and the detection plate to realize the relative fixed connection between the clamping plate and the detection plate.

5. The crop stalk thickness sensor according to claim 4, wherein, A support cylinder is fixed on the measuring plate, a sliding plate is slidably installed in the support cylinder, there is a pressing spring between the sliding plate and the inner wall of the support cylinder. When the pressing spring is in its natural length, the length of the connecting rod extending out of the support cylinder is the largest. The end of the connecting rod is provided with a protective pad on the inner side of the measuring plate.

6. The crop stalk thickness sensor according to claim 5, wherein The sensor body has a microprocessor, a data memory, and a wireless communication module. The microprocessor is signal-connected to the data memory, and the data memory is signal-connected to the wireless communication module.

7. The crop stalk thickness sensor according to claim 6, characterized in that, The top of the sensor body has a shell cover. One end of the shell cover is hinged to the sensor body, and there is a shell cover locking mechanism between the other end of the shell cover and the sensor body. After the shell cover locking mechanism locks the other end of the shell cover to the sensor body, the shell cover shields and seals the microprocessor, the data memory, and the wireless communication module.

8. The crop stalk thickness sensor according to claim 7, wherein The shell cover locking mechanism includes a fixed rod, a sliding seat, a support rod and a locking rod. The fixed rod is fixed to the side wall of the sensor body. The sliding seat has two and is slidably arranged on the fixed rod. The two sliding seats are connected by a strong spring. The support rods are two corresponding to the sliding seats one by one. The support rods are fixedly connected to the corresponding sliding seats, and the locking rod is fixed to the end of the support rod; when the strong spring is at a natural length, the locking rod is inserted into the other end of the shell cover to lock the shell cover; the sliding seat is pushed to both sides so that the locking rod moves out of the shell cover to release the lock of the shell cover.

9. The crop stalk thickness sensor according to claim 8, wherein, The shell cover is provided with a solar panel, which absorbs solar energy and converts it into electrical energy to provide electrical energy for the entire sensor body.

10. The crop stalk thickness sensor according to claim 9, characterized in that, The upper clamping member, the detection plate and the lower clamping member are located at different heights.

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