CN212520051U

CN212520051U - Flexible ground profile modeling detection sensor and harvester

Info

Publication number: CN212520051U
Application number: CN202020398845.1U
Authority: CN
Inventors: 李青龙; 闫鹏
Original assignee: Shandong University; Shandong Academy of Agricultural Machinery Sciences
Current assignee: Shandong University; Shandong Academy of Agricultural Machinery Sciences
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-02-12
Anticipated expiration: 2030-03-25

Abstract

The utility model relates to a flexible ground profile modeling detects sensor, harvester, include the profiling piece of making by flexible material, the one end of profiling piece can with the results platform fixed connection of harvester, the other end can with ground contact, the profiling piece includes flexible portion and rigidity portion, rigidity portion both sides terminal surface is provided with the rigidity piece, the inside bending pressure foil gage that is provided with of flexible portion, the utility model discloses a sensor has avoided the collision to damage, and the signal receives the interference little, and the testing result is accurate.

Description

Flexible ground profile modeling detection sensor and harvester

Technical Field

The utility model relates to a sensor technical field, concretely relates to flexible ground profile modeling detects sensor, harvester.

Background

The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.

The harvester is one of the main factors influencing the operation quality when in field operation, the harvesting platform is too high from the ground to cause the missing harvest, the too low cutting knife is damaged when in harvesting crops, and the like. At present, the detection means that this technique mainly relied on at present is mostly rigid contact detection, through at the harvester bench front end installation angle sensor, and the angle sensor rotation axis is connected with rigid metal or nylon profile plate, and profile plate and ground contact when ground and harvester bench distance change, profile plate ground end can rotate around the angle sensor rotation axis, calculates the rotation angle of angle sensor output through the trigonometric function, can draw the harvester bench apart from the height of ground. The inventor finds that the angle sensor is very sensitive, and the rigid profiling component is easy to generate vibration and bounce when walking close to the ground, so that the ground height detected and calculated is easy to be interfered and inaccurate, and finally, the control system controls the lifting action of the harvesting platform to be unstable. In addition, the rigid profile plate collides with a rigid body such as a stone block, which easily causes damage to the profile plate and the angle sensor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, provide a flexible ground profile modeling detection sensor, can effectively detect the results platform and the ground height of harvester, avoided the damage of sensor, reduced signal interference.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the embodiment of the utility model provides a flexible ground profile modeling detects sensor, include the profile modeling piece of being made by flexible material, the one end of profile modeling piece can with the results platform fixed connection of harvester, the other end can with ground contact, the profile modeling piece includes flexible portion and rigidity portion, rigidity portion both sides terminal surface is provided with the rigidity piece, the inside bending pressure foil gage that is provided with of flexible portion.

In a second aspect, embodiments of the present invention provide a harvester equipped with a flexible ground profile detection sensor.

The third aspect, the embodiment of the utility model provides a working method of harvester, flexible ground profile modeling detection sensor is along with the harvester in-process of advancing, when the distance changes between harvesting platform and the ground, the motion of rigidity portion, rigidity portion drive flexible portion produce the bending, and bending pressure foil gage resistance value changes, analyzes out the change of distance between harvesting platform and the ground through the resistance value change, and the harvester carries out the lift adjustment of harvesting platform according to the distance change of gathering.

The utility model has the advantages that:

1. the utility model discloses the rigidity portion of imitative piece sets up the rigidity piece for flexible material both sides face and forms, and with the ground contact be flexible material, be difficult for causing the collision to destroy long service life when colliding rigid bodies such as subaerial stone.

2. The utility model discloses a rigidity portion of profile modeling sets up the rigidity piece for flexible material both sides face and forms, and with the ground contact be flexible material, the vibrations spring that produces when walking pastes ground is little, and bending pressure foil gage sensitivity is compared in angle sensor and is little a lot less moreover, consequently detects and is difficult for receiving the interference, and the testing result is accurate, has promoted the stability and the adaptability that the harvester elevating platform goes up and down.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a front view of the overall structure of embodiment 1 of the present invention;

fig. 2 is a top view of the overall structure of embodiment 1 of the present invention;

fig. 3 is a schematic diagram of the detection principle of embodiment 3 of the present invention;

the bending stress strain gauge comprises a fixing portion 1, a fixing portion 1-1, a top surface of the fixing portion, a flexible portion 2, a rigid portion 3, an arc surface 3-1, a plane 3-2, a mounting seat 4, a metal plate 5, a rivet 6 and a bending stress strain gauge 7.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

For convenience of description, the words "upper", "lower", "left" and "right" in the present application, if any, merely indicate correspondence with the upper, lower, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the present invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As described in the background art, in the technology of automatically controlling the profiling height of the harvesting platform of the existing harvester to assist driving, the sensor is easily damaged, and the signal is easily interfered, so that the lifting action of the lifting platform is unstable.

In an exemplary embodiment of the present application, as shown in fig. 1-2, a flexible ground profile detection sensor includes a profile made of a flexible material, in this embodiment, the profile is made of a rubber material, and in other embodiments, the profile is made of a polyurethane elastomer or other flexible materials, which can be selected according to actual needs.

The profile comprises a fixed part 1, a flexible part 2 and a rigid part 3 which are integrally arranged, wherein a bending pressure strain gauge 7 is arranged in the flexible part, the bending pressure strain gauge can be an existing element, and the specific structure of the bending pressure strain gauge is not described in detail.

The fixed part is connected with the mounting seat 4, and the profiling piece can be through the results platform fixed connection of mounting seat and harvester, the mounting seat adopts metal side pipe, metal side pipe box is in the fixed part periphery to through rivet and fixed part fixed connection, metal side steel can with the results platform fixed connection of harvester. The fixed part is conveniently taken out from metal square pipe, conveniently maintains and changes the profile element.

In other embodiments, the cam is not provided with a fixing portion, the end of the flexible portion is connected with a fixing plate or a fixing block through a screw or other fastening members, the fixing plate or the fixing block can be fixedly connected with a harvesting platform of the harvester, and the cam can be fixedly connected with the harvesting platform in other forms, which will not be described in detail herein.

The two sides of the rigid part are provided with rigid parts, the rigid parts are rigid plates matched with the side shapes of the rigid parts, the rigid plates are metal plates 5, the metal plates are fixedly connected with the rigid part through fasteners, the fasteners are rivets 6, and bolts or screws and the like can also be adopted.

The rigid part is arranged, on one hand, the effect of preventing the profile part from being abraded can be achieved, and the effect of increasing the rigidity of the rigid part is also achieved.

The bottom surface of the rigid part is an arc surface 3-1, the top surface of the rigid part is a plane 3-2, the top surface of the rigid part and the top surface 1-1 of the fixing part are located on the same plane, the rigid part can be in contact with the ground through the arc surface, the rigid part is perpendicular to the cross section of the top surface and the bottom surface of the rigid part, and the circle center of a projection arc line of the bottom surface is located on a projection straight line of the top surface.

The rigid part is contacted with the ground through the arc surface, and the smooth running of the attached ground can be ensured. The cutting rigid part is made of rubber, so that the collision damage of rigid bodies such as ground stones is avoided, the generated vibration bounce is small when the harvester is attached to the ground to walk, the generated vibration bounce cannot be identified by the sensitivity of the bending pressure strain gauge, the interference of detection signals is reduced, the accuracy of detection results is improved, and the stability and the adaptability of the lifting adjustment of the harvesting table are ensured.

The flexible portion adopts the arc structure, and the protruding orientation of arc structure is used for setting towards ground, adopts this kind of setting to be favorable to the flexible portion kickup, and prevents that the flexible portion from because of gravity kickdown.

The bending pressure strain gauge in the flexible portion is connected with the controller and can transmit the resistance value to the controller.

Example 2:

the embodiment discloses a harvester, wherein a harvesting platform of the harvester is provided with a flexible ground profile detection sensor in the embodiment 1 through a mounting seat.

Example 3:

the embodiment discloses a working method of a harvester, in the process that a flexible ground profile modeling detection sensor travels along with the harvester, when the distance between a harvesting platform and the ground changes, a rigid part moves under the action of the ground, the rigid part drives the flexible part to bend upwards, the resistance value of a bending pressure strain gauge changes, the change value of the resistance value is transmitted to a controller, the controller analyzes the change of the distance between the harvesting platform and the ground through the change of the resistance value, and the controller controls the harvesting platform to lift and adjust according to the collected distance change value.

The detection principle of the sensor is shown in fig. 3, a point a at the top end of the profile is used as a reference point of the height of the harvesting platform from the ground, an included angle between the top surface of the fixing part and the horizontal plane is x degrees, an included angle between the top surface of the rigid part and the horizontal plane is y degrees, x is y degrees because the top surfaces of the fixing part and the rigid part are on the same plane, a point on a plane boundary line of a symmetrical surface of the flexible part and the top surfaces of the fixing part and the rigid part is a point B, the center of a projected arc line of the bottom surface of the rigid part on the vertical plane is a point C, the points a, B and C are on the same vertical plane, the radius of the arc line is R, the length of the whole profile (namely the distance between the point a and the point C) is L, the distance between the point B and the point C is I, the vertical distance between the point a and the point B is H1, the vertical distance between the.

According to the distance correspondence, the formula can be obtained:

H＝h1+R+h2＝(L×sinx-I×sinx)+I×siny+R (1)

because the contact points of the sensor and the ground are both in the arc surfaces, the deformation can be approximately regarded as that the center C of the circle at the lower end of the copying piece rotates around the point B, the resistance value of the bending pressure strain gauge subjected to the bending pressure of the flexible part changes, the controller can determine the value of the bending angle y of the flexible copying plate by detecting the resistance value change at the moment, and the vertical distance H between the point A and the ground, namely the distance between the harvesting table and the ground, can be calculated by a formula (1).

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims

1. The utility model provides a flexible ground profile modeling detection sensor, its characterized in that includes the profile element of being made by flexible material, the one end of profile element can with the results platform fixed connection of harvester, the other end can with ground contact, the profile element includes flexible portion and rigidity portion, rigidity portion both sides terminal surface is provided with the rigidity piece, the inside bending pressure foil gage that is provided with of flexible portion.

2. A flexible ground profile detection sensor as claimed in claim 1 wherein the profile has a mounting socket secured to an end of the profile, the profile being capable of being fixedly connected to the harvesting platform of the harvester by the mounting socket.

3. The flexible ground profile modeling detection sensor of claim 2, wherein the mounting base is a metal square tube that is sleeved around the outer circumference of the end of the profile and is fixedly connected to the profile.

4. The flexible ground profile modeling sensor of claim 1, wherein the bottom surface of the rigid portion is a circular arc surface and the top surface is a flat surface, the rigid portion is capable of contacting the ground through the circular arc surface, and in a cross section perpendicular to the top surface and the bottom surface of the rigid portion, the center of the circular arc line projected from the bottom surface is located on the straight line projected from the top surface.

5. The flexible ground profiling detecting sensor according to claim 1, wherein the flexible portion is an arc-shaped structure, and a projecting direction of the arc-shaped structure is used to be disposed toward the ground.

6. The flexible ground profile detection sensor of claim 1, wherein the rigid member is a rigid plate having a shape matching a lateral shape of the rigid portion, and the rigid plate is fixedly connected to the rigid portion by a fastener.

7. The flexible ground profiling detecting sensor according to claim 6, wherein the rigid plate is a metal plate.

8. The flexible ground profiling detecting sensor according to claim 1, wherein the bending pressure strain gauge is connected with the controller, and the resistance value of the bending pressure strain gauge can be transmitted to the controller.

9. A flexible ground profiling detection sensor according to claim 1 wherein the profile is made of rubber or polyurethane elastomer.

10. A harvester equipped with a flexible ground profile detection sensor according to any one of claims 1 to 9, wherein the flexible ground profile detection sensor is fixedly connected to a harvesting platform of the harvester.