Seeder sensor

Abstract

The utility model discloses a sower sensor comprising an elastic body, a strain gauge, flexible PCBs and a digital transmitter, the strain gauge is a Wheatstone bridge composed of four half-bridge shear strain gauges, the flexible PCBs comprise a first flexible PCB and a second flexible PCB, and the digital transmitter is a digital transmitter. The input end of the first flexible PCB is electrically connected with the first half-bridge shearing strain gauge and the second half-bridge shearing strain gauge, the input end of the second flexible PCB is electrically connected with the third half-bridge shearing strain gauge and the fourth half-bridge shearing strain gauge, and the output end of the first flexible PCB and the output end of the second flexible PCB are electrically connected with the input end of the digital transmitter. And the digital transmitter is arranged at any axial end of the elastic body. According to the utility model, the four half-bridge shear strain gauges are attached in the four strain grooves of the elastic body, and the four half-bridge shear strain gauges are mutually compensated front and back and left and right, so that the sensor has very high precision and temperature change resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensing technology, and particularly relates to a seeder sensor. Background Art

[0002] In recent years, with the rapid development of digital technology, agricultural equipment has also been transformed towards the direction of intelligence. As one of the important agricultural machinery, seeders have gradually introduced digital sensor technology. The introduction of sensors can improve the efficiency and accuracy of seeders, thus meeting the requirements of modern agriculture. A seeder agricultural machinery sensor refers to a seeder agricultural machinery device integrated with digital sensor technology, which realizes data acquisition, transmission, digital analysis and decision-making by monitoring and recording the working state, seeding quantity, soil conditions, etc. of the seeder in real time.

[0003] At present, the development of agricultural mechanization in China has entered the fast lane. As an important part of it, seeders have been widely used. However, domestic seeders are mainly pure mechanical equipment. During the working process of the equipment, the working state is not feedback to the operators. The operators only give instructions to the seeder unilaterally. The operators do not know the seeding quality, and the managers cannot grasp the on-site production situation in time, and cannot change the seeding plan and correct the seeding strategy in time. Moreover, a series of problems also exist in traditional seeders, such as unstable seeding quality and waste of seeds, resulting in low agricultural production efficiency and unable to meet the requirements of modern agricultural production.

[0004] Therefore, a seeder sensor is urgently needed to be proposed. Content of the Utility Model

[0005] To solve the defects existing in the prior art, the utility model provides a seeder sensor.

[0006] To solve the above technical problems, the utility model provides the following technical solutions:

[0007] The utility model provides a seeding machine sensor, which comprises an elastic body, a strain gauge, a flexible PCB and a digital transmitter. The elastic body is of a cylindrical structure. The strain gauge is a Wheatstone bridge composed of 4 half-bridge shear strain gauges. The 4 half-bridge shear strain gauges include a first half-bridge shear strain gauge, a second half-bridge shear strain gauge, a third half-bridge shear strain gauge and a fourth half-bridge shear strain gauge. The first half-bridge shear strain gauge and the second half-bridge shear strain gauge are arranged on the elastic body at intervals on the same axis of the elastic body. The third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge are arranged on the elastic body and are respectively symmetrical with the first half-bridge shear strain gauge and the second half-bridge shear strain gauge. The flexible PCB includes a first flexible PCB and a second flexible PCB. The input end of the first flexible PCB is electrically connected to the first half-bridge shear strain gauge and the second half-bridge shear strain gauge. The input end of the second flexible PCB is electrically connected to the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge. The output ends of the first flexible PCB and the second flexible PCB are electrically connected to the input end of the digital transmitter. The digital transmitter is arranged at any axial end of the elastic body.

[0008] Preferably, a first strain groove and a second strain groove are arranged on the outer surface of the elastic body at intervals on the same axis. A third strain groove and a fourth strain groove are symmetrically arranged on the outer surface of the elastic body with respect to the first strain groove and the second strain groove respectively. The first half-bridge shear strain gauge, the second half-bridge shear strain gauge, the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge are respectively arranged in the first strain groove, the second strain groove, the third strain groove and the fourth strain groove.

[0009] Preferably, a first connecting groove is further arranged on the outer surface of the elastic body between the first strain groove and the second strain groove. A second connecting groove is further arranged on the outer surface of the elastic body between the third strain groove and the fourth strain groove. The elastic body is provided with a connecting through hole perpendicular to the axis of the elastic body. The connecting through hole is communicated with the first connecting groove and the second connecting groove. The first flexible PCB is arranged in the first connecting groove. The second flexible PCB is arranged in the second connecting groove.

[0010] Preferably, an end mounting groove is arranged at any axial end of the elastic body. The digital transmitter is arranged in the end mounting groove. The end mounting groove is communicated with the first strain groove and the third strain groove, or with the second strain groove and the fourth strain groove through a second connecting through hole.

[0011] Preferably, the opening of the end mounting groove is sealed by an end sealant and a cover plate.

[0012] Preferably, a cable connector and a cable are further provided on the elastomer. The cable connector communicates with the end mounting groove. One end of the cable passes through the cable connector and is electrically connected to the digital transmitter, and the other end of the cable is provided with a connector.

[0013] Preferably, annular positioning grooves are provided on the first connection groove and the second connection groove and on the outer side of the connection through hole.

[0014] Preferably, a first sealant layer and a second sealant layer are further provided. The first sealant layer is disposed in the first strain groove, the second strain groove, the third strain groove, and the fourth strain groove. The second sealant layer is disposed in the first strain groove, the second strain groove, the third strain groove, the fourth strain groove, the first connection groove, and the second connection groove and on the outer side of the first sealant layer. The hardness of the first sealant layer is less than the hardness of the second sealant layer.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) In the utility model, 4 half-bridge shear strain gauges are attached in 4 strain grooves of the elastomer, compensating each other in the front, back, left, and right directions, so that the sensor has high precision and the ability to resist temperature changes.

[0017] (2) In the utility model, the strain gauge is sealed with the first sealant layer and the second sealant layer, and the digital transmitter is sealed with the end sealant and the cover plate. Coupled with the cable and connector with good waterproof and wear resistance, it is ensured that the sensor can meet the IP68 protection level, improving the protection ability of the sensor while ensuring that the performance of the sensor is not affected.

[0018] (3) In the utility model, the digital transmitter based on TI's PGA900 is small in volume, high in precision, digitally calibrated, and can be calibrated after encapsulation, eliminating the influence of factors such as glue and laser welding on the sensor precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of a seeding machine sensor of the utility model;

[0020] Figure 2 is a schematic diagram of the structure of the elastomer in a seeding machine sensor of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following is a description of the preferred embodiments of the utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the utility model, and are not intended to limit the utility model.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings of the specification. Figure 1 It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] As Figures 1 to 2 shown, this embodiment provides a seeder sensor, which includes an elastomer 1, a strain gauge 2, a flexible PCB 3, and a digital transmitter 4. The elastomer 1 has a cylindrical structure. On the outer surface of the elastomer 1 and at the same axis thereof, a first strain groove and a second strain groove are provided at intervals left and right. On the outer surface of the elastomer 1 and symmetrically with the first strain groove and the second strain groove respectively, a third strain groove and a fourth strain groove are provided. On the outer surface of the elastomer 1 and between the first strain groove and the second strain groove, a first connection groove is further provided. On the outer surface of the elastomer 1 and between the third strain groove and the fourth strain groove, a second connection groove is further provided. The elastomer 1 is provided with a connection through-hole 11 perpendicular to the axial direction of the elastomer, and the connection through-hole 11 communicates with the first connection groove and the second connection groove. On the first connection groove and the second connection groove and on the outer side of the connection through-hole, a circular ring positioning groove 13 is provided. The elastomer is made of high-quality acid and alkali-resistant stainless steel 17-4PH to ensure that the quality of the sensor for long-term outdoor use is not affected.

[0025] In this embodiment, the strain gauge 2 is a Wheatstone bridge composed of 4 half-bridge shear strain gauges. The 4 half-bridge shear strain gauges include a first half-bridge shear strain gauge, a second half-bridge shear strain gauge, a third half-bridge shear strain gauge, and a fourth half-bridge shear strain gauge. The first half-bridge shear strain gauge and the second half-bridge shear strain gauge are arranged on the elastomer 1 at intervals on the same axis of the elastomer. The third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge are arranged on the elastomer 1 and are respectively symmetrical with the first half-bridge shear strain gauge and the second half-bridge shear strain gauge. The first half-bridge shear strain gauge, the second half-bridge shear strain gauge, the third half-bridge shear strain gauge, and the fourth half-bridge shear strain gauge are respectively arranged in the first strain groove, the second strain groove, the third strain groove, and the fourth strain groove.

[0026] In this embodiment, the first flexible PCB is disposed in the first connection groove, and the second flexible PCB is disposed in the second connection groove. The flexible PCB 3 includes the first flexible PCB and the second flexible PCB. The input end of the first flexible PCB is electrically connected to the first half-bridge shear strain gauge and the second half-bridge shear strain gauge. The input end of the second flexible PCB is electrically connected to the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge. The output ends of the first flexible PCB and the second flexible PCB are electrically connected to the input end of the digital transmitter 4.

[0027] In this embodiment, an end mounting groove 12 is provided at the left end of the elastomer 1 in the axial direction. The digital transmitter 4 is disposed in the end mounting groove 12. The end mounting groove 12 communicates with the first strain groove and the third strain groove through the second connection through hole 14. The opening of the end mounting groove 12 is sealed by an end sealant 5 and a cover plate 6. A cable joint 7 and a cable 8 are further provided on the elastomer 1. The cable joint 7 communicates with the end mounting groove. One end of the cable 8 passes through the cable joint 7 and is electrically connected to the digital transmitter 4. The other end of the cable 8 is provided with a connector 9. The digital transmitter is sealed with an end sealant and a cover plate, and together with the cable and connector with good waterproof and wear resistance, it ensures that the sensor can meet the IP68 protection level. The digital transmitter based on TI's PGA900 is small in size, high in precision, digitally calibrated, and can be calibrated after encapsulation, eliminating the influence of factors such as glue and laser welding on the sensor accuracy.

[0028] In this embodiment, a first sealant layer 10 and a second sealant layer 11 are further provided. The first sealant layer 10 is disposed in the first strain groove, the second strain groove, the third strain groove, and the fourth strain groove. The second sealant layer 11 is disposed in the first strain groove, the second strain groove, the third strain groove, the fourth strain groove, the first connection groove, and the second connection groove and is located outside the first sealant layer. The hardness of the first sealant layer is less than that of the second sealant layer. The strain gauge is sealed with the first sealant layer and the second sealant layer, improving the protection ability of the sensor while ensuring that the performance of the sensor is not affected.

[0029] The working principle of this embodiment will be further described below:

[0030] The strain gauge is a Wheatstone bridge composed of 4 half-bridge shear strain gauges. When the sensor is subjected to a force, the resistance of the strain gauge changes, and the Wheatstone bridge outputs a signal. The sensor signal is amplified after passing through the digital signal transmitter, and the signal is output to the controller of the seeder through the cable. The driver makes corresponding operations according to the data of the controller. The 4 half-bridge shear strain gauges are attached to the 4 strain grooves of the elastomer, compensating each other in the front, back, left, and right directions, making the sensor have high precision and the ability to resist temperature changes.

[0031] Finally, it should be noted that the above are only preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A seed drill sensor, characterized in that: The device comprises an elastic body (1), a strain gauge (2), a flexible PCB (3) and a digital transmitter (4), wherein the elastic body (1) is a cylindrical structure, the strain gauge (2) is a Wheatstone bridge composed of four half-bridge shear strain gauges, the four half-bridge shear strain gauges include a first half-bridge shear strain gauge, a second half-bridge shear strain gauge, a third half-bridge shear strain gauge and a fourth half-bridge shear strain gauge, the first half-bridge shear strain gauge and the second half-bridge shear strain gauge are arranged on the elastic body (1) at intervals on the same axis of the elastic body, and the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge are arranged on the elastic body (1) and are respectively symmetrical with the first half-bridge shear strain gauge and the second half-bridge shear strain gauge; the flexible PCB (3) comprises a first flexible PCB and a second flexible PCB, the input end of the first flexible PCB is electrically connected to the first half-bridge shear strain gauge and the second half-bridge shear strain gauge, the input end of the second flexible PCB is electrically connected to the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge, the output ends of the first flexible PCB and the second flexible PCB are electrically connected to the input end of a digital transmitter (4), and the digital transmitter (4) is arranged at any axial end of the elastic body (1).

2. A seed drill sensor according to claim 1, characterized in that: A first strain groove and a second strain groove are provided on the outer surface of the elastic body (1) and on the same axis thereof at intervals; a third strain groove and a fourth strain groove are provided on the outer surface of the elastic body (1) and are symmetrical with the first strain groove and the second strain groove respectively; the first half-bridge shear strain gauge, the second half-bridge shear strain gauge, the third half-bridge shear strain gauge and the fourth half-bridge shear strain gauge are provided in the first strain groove, the second strain groove, the third strain groove and the fourth strain groove respectively.

3. A seed drill sensor according to claim 2, characterized in that: A first connecting groove is further provided on the outer surface of the elastic body (1) and located between the first strain groove and the second strain groove; a second connecting groove is further provided on the outer surface of the elastic body (1) and located between the third strain groove and the fourth strain groove; a connecting through hole (15) is provided on the elastic body (1) in an axial direction perpendicular to the elastic body; the connecting through hole (15) is connected to the first connecting groove and the second connecting groove; the first flexible PCB is arranged in the first connecting groove; and the second flexible PCB is arranged in the second connecting groove.

4. A seed drill sensor according to claim 3, characterized in that: An end mounting groove (12) is provided at any axial end of the elastic body (1), the digital transmitter (4) is arranged in the end mounting groove (12), and the end mounting groove (12) is connected to the first strain groove, the third strain groove, or the second strain groove, the fourth strain groove through a second connecting through hole (14).

5. A planter sensor according to claim 4, characterized in that: The opening of the end mounting groove (12) is sealed by means of end sealant (5) and a cover plate (6).

6. A seed drill sensor according to claim 5, characterized in that: The elastic body (1) is also provided with a cable connector (7) and a cable (8); the cable connector (7) is connected to the end mounting groove; one end of the cable (8) passes through the cable connector (7) to be electrically connected to the digital transmitter (4); and the other end of the cable (8) is provided with a connector (9).

7. A planter sensor according to claim 3, characterized in that: A circular positioning groove (13) is provided on the first connecting groove and the second connecting groove and is located outside the connecting through hole.

8. A planter sensor according to claim 7, characterized in that: A first sealing adhesive layer (10) and a second sealing adhesive layer (11) are also provided, wherein the first sealing adhesive layer (10) is arranged in the first strain groove, the second strain groove, the third strain groove and the fourth strain groove, and the second sealing adhesive layer (11) is arranged in the first strain groove, the second strain groove, the third strain groove, the fourth strain groove, the first connecting groove and the second connecting groove and is located outside the first sealing adhesive layer, and the hardness of the first sealing adhesive layer is less than the hardness of the second sealing adhesive layer.

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