Multi-working-condition adjustable parameter detection test bed for corn threshing and winnowing

Abstract

The invention relates to a corn threshing and winnowing multi-working-condition adjustable parameter detection test bed which comprises a vibration rack, two sets of vibration sliding rails arranged in parallel, a screen, a crank connecting rod driving mechanism and an airflow output air channel. The screen cloth is obliquely arranged, and the two opposite sides of the screen cloth are slidably connected to the two vibration sliding rails correspondingly. The driving end of the crank connecting rod driving mechanism is connected with the screen cloth and drives the screen cloth to reciprocate along the vibration sliding rails. An air outlet of the airflow output air duct is positioned obliquely below the screen and is parallel to the screen; the driving end of the crank connecting rod driving mechanism is provided with a plurality of connecting holes used for being connected with the screen cloth. By arranging a plurality of connecting holes, the screen can be mounted on different connecting holes, the amplitude of the screen can be adjusted, the vibration frequency is changed by changing the rotating speed of the crank connecting rod driving mechanism, the air speed is changed by changing the distance of the air outlet of the air duct, and the problem of multi-parameter working condition simulation test of one test bed is solved.

Description

Technical Field

[0001] The invention relates to the technical field related to grain threshing experiments, and in particular to a parameter detection test bench for corn threshing and winnowing with adjustable multiple working conditions. Background Art

[0002] Corn is one of the three major staple crops. With the improvement of the mechanized harvesting level of corn, the number of corn grain harvesting machinery applications is also further increasing. Slight changes in each harvesting link of the harvesting machinery will have a huge impact on the harvesting quality. Among them, the main working process of the corn grain harvester is to pick the corn ears, thresh and clean the corn and then transport it to the grain storage device. The cleaning operation is a very important link in the corn grain harvester. The quality of the cleaning operation directly affects the impurity rate of the grain harvest, and then affects the quality of the grain harvest. The material after corn threshing is composed of grain particles and impurity particles. Among them, corn particles have the physical property of high floating speed, while impurity particles are the opposite. Therefore, the cleaning link in the corn grain harvester mainly adopts the wind selection system, which is based on the coupling effect of the screen and airflow to screen the agricultural material particles. They are mainly screened by the wind screen cleaning mechanism. The coupling effect of the screen vibration and airflow can separate impurities with low floating speed from grains with high floating speed.

[0003] According to the distribution characteristics of the airflow field required for screening grain particles above the screen, some researchers have conducted relevant research on the airflow field above the screen. They used the grain resistance model and the screen airflow resistance model to quantify the equivalent resistance of different air ducts of the fan to enhance the intensity of the airflow field during the grain falling process. The results showed that the multi-duct centrifugal fan can effectively separate the grains in the falling process area. Other researchers used the structural improvement of the screen to realize the different functional distribution behaviors of the airflow above the screen and improve the separation effect of grain particles. Based on CFD static simulation, the influence of the opening of the sieve plate on the airflow distribution in the purification space was simulated, which can provide a reference for the optimization of the airflow field. The above research mainly focuses on the influence of the screen structure on the macroscopic distribution of the airflow field under fixed vibration parameters. However, in the actual grain harvesting process, the vibration intensity of the cleaning screen needs to be adjusted according to the working conditions. At the same time, the main cleaning screens used are fish scale screens, round hole screens and woven screens, and the operating conditions of different screens are also different. Summary of the invention

[0004] The purpose of the present invention is to provide a working parameter quantitative research test device to address the problem of different airflow fields of different structural screens of grain harvesters, so as to realize the functions of detecting and adjusting the distribution of different functional airflow fields under different vibration intensities, find the optimal working parameters of different screens under different working conditions, and improve the quality of corn grain harvesting.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a parameter detection test bench for corn threshing and air selection with adjustable multiple working conditions, comprising a vibration frame, two sets of parallel arranged vibration slide rails, a screen, a crank connecting rod driving mechanism and an air flow output duct, wherein the vibration slide rails are installed on the vibration frame horizontally or horizontally inclined, the screen is arranged obliquely and slidably connected to the two sets of vibration slide rails on opposite sides, the driving end of the crank connecting rod driving mechanism is connected to the screen and drives the screen to reciprocate along the vibration slide rail; the air outlet of the air flow output duct is located obliquely below the screen and arranged parallel to the screen; The driving end of the crank connecting rod driving mechanism is provided with a plurality of connecting holes for respectively connecting to the screen meshes.

[0006] The beneficial effects of the present invention are as follows: the parameter detection test bench for corn threshing and air selection with adjustable multiple working conditions, by setting a vibration frame, a vibration slide rail and an airflow output duct, and cooperating with a crank connecting rod drive mechanism and a screen, converts the vertical vibration of the grain cleaning screen into a lateral movement along the vibration slide rail, thereby solving the problem that the test bench is not easy to build due to the large vertical space occupied in the cleaning operation of the grain harvester. By setting a plurality of connecting holes, the screen can be installed on different connecting holes, the amplitude of the screen can be adjusted, the vibration frequency can be changed by changing the rotation speed of the crank connecting rod drive mechanism, and the wind speed can be changed by changing the air outlet distance of the air duct, thereby solving the problem of multi-parameter working condition simulation test of a test bench.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the crank-connecting rod drive mechanism includes a driving part, a first driving connecting rod and a second driving connecting rod. The power output shaft of the driving part is vertically fixedly connected to one end of the first driving connecting rod, the other end of the first driving connecting rod is vertically hinged to one end of the second driving connecting rod, and the other end of the second driving connecting rod is provided with a plurality of the connecting holes.

[0009] Furthermore, the plurality of connecting holes are arranged in sequence and spaced apart along the length direction of the second driving connecting rod.

[0010] The beneficial effect of adopting the above further solution is that the amplitude of the screen can be adjusted by using different connecting holes.

[0011] Furthermore, the crank-connecting rod driving mechanism is installed below the screen and the air outlet of the airflow output duct; when the screen moves back and forth under the drive of the crank-connecting rod driving mechanism, the air outlet of the airflow output duct is always arranged opposite to the screen.

[0012] The beneficial effect of adopting the above further scheme is that the distance between the output airflow and the screen at each outlet of the airflow output duct can be made consistent, and the oblique section of the air outlet is used as the reference plane, and the vibration direction of the test bench screen body is regarded as vertical, so that the wind selection process of the grain harvester can be simulated.

[0013] Furthermore, the airflow output duct includes an air inlet section, a diffusion section, a stabilization section, a honeycomb section and a contraction section which are connected in sequence, and the outlet of the contraction section serves as an outlet of the airflow output duct.

[0014] The beneficial effect of adopting the above further scheme is: the air inlet section, diffusion section, stabilization section, honeycomb section and contraction section are combined to form an airflow output duct, which improves the separation of large vortices into small vortices, promotes the attenuation of vortices and reduces airflow disturbance, so that the airflow is smoothly delivered to the screen body.

[0015] Furthermore, the vibration frame includes a main frame and a built-in oblique frame, the main frame is respectively provided with four fixed cross bars, and eight corners of the built-in oblique frame are respectively installed in pairs on the corresponding fixed cross bars; the vibration slide rail is installed on the built-in oblique frame.

[0016] The beneficial effect of adopting the above further solution is that by providing a built-in inclined frame, the screen can be easily set to an inclined structure.

[0017] Furthermore, the main frame and the built-in oblique frame are both cubic structures, and reinforcing ribs are provided between the cross beams and vertical beams of the main frame and between the fixed cross bars and vertical beams for strengthening the connection, and reinforcing rods are provided between the cross bars and vertical bars of the built-in oblique frame for strengthening the connection; the main structure of the crank-connecting rod drive mechanism is installed on the built-in oblique frame through a drive structure frame.

[0018] The beneficial effect of adopting the above further solution is that by providing reinforcing ribs and reinforcing rods, the structural strength of the entire vibration frame is increased, making the vibration experiment more stable and reliable.

[0019] Furthermore, it also includes a wind speed detection unit, which is installed above the screen.

[0020] The beneficial effect of adopting the above further solution is that by providing a wind speed detection unit, the wind speed can be detected and recorded.

[0021] Furthermore, the wind speed detection unit includes a wind speed detection rod, a wind speed sensor, and a paperless recorder, and the wind speed sensor is connected to the wind speed detection rod and the paperless recorder respectively.

[0022] Furthermore, there are two crank-connecting rod driving mechanisms, which are respectively arranged on both sides of the screen, and the driving ends of the two crank-connecting rod driving mechanisms are respectively connected to the opposite sides of the screen.

[0023] The beneficial effect of adopting the above further solution is that by providing two crank-connecting rod driving mechanisms, the driving of the screen is made more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a parameter detection test bench with adjustable multi-working conditions for corn threshing and air selection according to the present invention; Figure 2 It is a schematic diagram of the connection structure of the crank-connecting rod driving mechanism of the present invention; Figure 3 It is a schematic diagram of the connection structure between the first driving connecting rod and the second driving connecting rod of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the airflow output duct of the present invention; Figure 5 This is a schematic diagram of the structure of two angle irons connected in the present invention; Figure 6 This is a schematic diagram of the main structure of the corn threshing and air separation multi-condition adjustable parameter detection test bench of the present invention; Figure 7 It is a schematic diagram of the structure of the corn threshing and air separation multi-condition adjustable parameter detection test bench of the present invention from a bottom view; Figure 8 It is a top view structural schematic diagram of a parameter detection test bench with adjustable multi-working conditions for corn threshing and air separation according to the present invention; Fig. 9 It is a right view structural schematic diagram of the parameter detection test bench with adjustable multi-working conditions for corn threshing and air separation of the present invention; Fig.10 It is a left-view structural schematic diagram of the parameter detection test bench with adjustable multi-working conditions for corn threshing and air selection of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Main frame; 10. Air duct frame; 101. Air duct connecting piece; 11. Built-in oblique frame; 12. Fixed cross bar; 13. Angle iron; 131. Side wall; 132. Bottom wall; 14. Connecting pin; 15. Vertical beam; 16. Cross beam; 17. Reinforcement rib; 18. Cross bar; 19. Vertical bar; 190. Reinforcement bar; 191. Triangular reinforcement plate; 2. Vibrating slide rail; 3. Screen frame; 31. Net body; 32. Connecting shaft; 33. Screen frame fixing plate; 34. Sliding block; 4. 24V DC servo motor; 41. First drive connecting rod; 42. Second drive connecting rod; 43. Connecting key; 44. Power output shaft; 45. Connecting hole; 46. Drive structure frame; 47. Motor fixing seat; 48. Servo motor driver; 49. Servo motor synchronous controller; 491. 24V DC power supply controller; 5. air flow output duct; 51. air outlet; 52. air inlet section; 53. diffusion section; 54. stabilization section; 55. honeycomb section; 56. contraction section; 6. Wind speed detection unit; 61. Wind speed detection rod; 62. Wind speed sensor; 63. Paperless recorder; 64. 24V DC power supply. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 to Figure 10 As shown, a corn threshing and air selection parameter detection test bench with adjustable multiple working conditions in this embodiment comprises a vibration frame, two sets of parallel arranged vibration slide rails 2, a screen, a crank connecting rod driving mechanism and an airflow output duct 5, wherein the vibration slide rails 2 are horizontally or horizontally installed on the vibration frame, the screen is tilted and slidably connected to the two sets of vibration slide rails 2 on opposite sides, the driving end of the crank connecting rod driving mechanism is connected to the screen and drives the screen to reciprocate along the vibration slide rails 2; the air outlet 51 of the airflow output duct 5 is located obliquely below the screen and is arranged parallel to the screen; like Figure 2 and Figure 3 As shown, the driving end of the crank connecting rod driving mechanism of this embodiment is provided with a plurality of connection holes 45 for connecting the screens respectively. The crank connecting rod driving mechanism comprises a driving part, a first driving connecting rod 41 and a second driving connecting rod 42, the power output shaft 44 of the driving part is vertically fixedly connected to one end of the first driving connecting rod 41, the other end of the first driving connecting rod 41 is vertically hinged to one end of the second driving connecting rod 42, and the other end of the second driving connecting rod 42 is provided with a plurality of the connection holes 45. Specifically, the second driving connecting rod 42 is also arranged vertically with the power output shaft 44.

[0028] like Figure 2 and Figure 3 As shown, the plurality of connection holes 45 of this embodiment are sequentially arranged at intervals along the length direction of the second driving connecting rod 42. The amplitude of the screen can be adjusted by using different connection holes.

[0029] Preferably, there are three connection holes 45, namely a high-amplitude connection hole (the uppermost connection hole), a medium-amplitude connection hole (the middle position connection hole) and a low-amplitude connection hole (the lowermost connection hole).

[0030] Specifically, the driving part can adopt a 24V DC servo motor 4, wherein the 24V DC servo motor is equipped with a servo motor driver 48, a servo motor synchronous controller 49 and a 24V DC power supply controller 491, and the two motor bodies are fixed on the driving structure frame 46 on both sides of the vibration frame through a motor fixing seat 47; a connecting key 43 is provided on the power output shaft 44 of the 24V DC servo motor, and the power output shaft 44 is connected to the keyway hole at the end of the first driving connecting rod; the front end of the first driving connecting rod is connected to the second driving connecting rod through a transmission connecting rod pin, and the first driving connecting rod is connected to the screen frame through a connecting shaft, and the screen frame and the four groups of sliders 34 are connected and fixed through the screen frame fixing plate 33; the four groups of sliders 34 move on the vibration slide rail 2, and the four groups of vibration slide rails 2 are installed on the slide rail fixing square tube aluminum profile in the built-in inclined frame 11. The servo motor driver 48 can change the rotation speed of the servo motor, thereby controlling the horizontal vibration frequency of the screen.

[0031] This embodiment uses a 24V DC servo motor power output shaft 44, a first drive connecting rod 41 and a second drive connecting rod 42 to form a crank connecting rod drive mechanism, which converts the rotational motion of the power output shaft 44 into a linear motion along the direction of the second drive connecting rod 42. The second drive connecting rod 42 is connected to the screen, and the screen can slide on the vibration slide rail 2. The movement direction of the screen is converted into reciprocating horizontal motion, i.e. horizontal vibration, through the installation angle of the built-in inclined frame 11. The servo motor synchronous controller 49 can change the speed of the motor, thereby controlling the frequency of the horizontal vibration of the screen body.

[0032] like Figure 2 As shown, a hinge hole is provided on one side of the screen of this embodiment, and the screen is connected to the driving end of the crank connecting rod driving mechanism through a connecting shaft 32 passing through the hinge hole and one of the connecting holes.

[0033] like Figure 1 and Figure 6 As shown, the crank connecting rod driving mechanism of this embodiment is installed below the screen and the air outlet of the airflow output duct; during the reciprocating motion of the screen driven by the crank connecting rod driving mechanism, the air outlet 51 of the airflow output duct 5 is always arranged directly opposite the screen. The distance between the output airflow at each outlet of the airflow output duct and the screen can be made consistent, and the oblique section of the air outlet is taken as the reference plane, and the vibration direction of the test bench sieve body is regarded as vertical, so that the winnowing process of the grain harvester can be simulated.

[0034] A preferred solution of this embodiment is that the inclination angle of the screen is 55°.

[0035] like Figure 4 , Figure 6~Figure 8As shown, the airflow output duct 5 of this embodiment includes an air inlet section 52, a diffuser section 53, a stabilizing section 54, a honeycomb section 55 and a contraction section 56 connected in sequence, and the outlet of the contraction section 56 serves as the air outlet 51 of the airflow output duct 5. The air inlet section, the diffuser section, the stabilizing section, the honeycomb section and the contraction section are combined to form the airflow output duct, improve the separation of large vortices into small vortices, promote the attenuation of vortices and reduce airflow disturbance, so that the airflow is smoothly delivered to the sieve body.

[0036] Specifically, the air inlet section 52 of this embodiment is directly connected to the fan, with an inlet size of 130mm×130mm and a length of 100mm; the diffuser section is connected behind the air inlet section, and the air duct size after diffusion is 212mm×212mm and 300mm, and linear expansion is adopted; the stabilizing section is connected behind the diffuser section, with a size of 212mm×212mm and a length of 100mm; the honeycomb section is a solid plate with holes, densely and regularly arranged, connected behind the first stabilizing section, with the same size as the stabilizing section, a length of 50mm, and a honeycomb hole diameter of 12mm; the second The first stable section is installed behind the honeycomb section, with the same size as the first stable section and a length of 200mm; the contraction section is installed behind the second stable section, with the same inlet size as the stable section, and the outlet size is 100mm×100mm, with a length of 210mm, and it adopts a curve taper; the air outlet is connected behind the contraction section, with a size of 100mm×100mm and a length of 215mm, and the outlet is an inclined plane, with an angle consistent with the installation angle of the sieve body; all air duct sections are connected by air duct connecting pieces 101, and the air duct connecting pieces 101 fix the air duct as a whole on the air duct frame 10. The function of the diffusion section is to ensure smooth airflow delivery and reduce airflow separation; the function of the honeycomb section is to improve the separation of large vortices into small vortices, promote the attenuation of vortices, and thus further improve the uniformity of airflow; the function of the contraction section is to accelerate the airflow and reduce airflow disturbance.

[0037] like Figure 4 , Figure 6~Figure 8 As shown, the entire airflow output duct 5 of this embodiment is arranged horizontally, and the air outlet 51 is an inclined surface. The air duct is placed horizontally, the air outlet outputs the airflow horizontally, the oblique section of the air outlet is parallel to the sieve body, and the distance between each output airflow and the sieve body is consistent. Taking the oblique section of the air outlet as the reference plane, the vibration direction of the test bench sieve body is regarded as vertical, and the winnowing process of the grain harvester can be simulated.

[0038] like Figure 1 , Figure 6~Figure 10As shown, the vibration frame of this embodiment includes a main frame 1 and a built-in inclined frame 11, and four fixed cross bars 12 are respectively provided on the main frame 1, and eight corners of the built-in inclined frame 11 are respectively installed on the corresponding fixed cross bars 12 in pairs; the vibration slide rail 2 is installed on the built-in inclined frame 11. By providing a built-in inclined frame, it is convenient to set the screen as an inclined structure.

[0039] like Figure 1 , Figure 5~Figure 8 As shown, each corner of the built-in inclined frame 11 of this embodiment is installed on the corresponding fixed cross bar 12 through two angle irons 13 connected and fixed by connecting pins 14. Specifically, the angle iron 13 includes two side walls 131 and a bottom wall 132, and the overall structure is a U-shaped structure. A fixing hole can be opened on the bottom wall 132 to facilitate connection and fixation with the frame. The two angle irons 13 are connected and fixed by the connecting pins 14 after being misaligned and inserted. The angles of the two angle irons 13 can be adjusted as needed. After adjustment, the connecting pins 14 can be tightened for positioning, thereby adjusting the placement angle of the internal screen.

[0040] Specifically, four fixed cross bars 12 are respectively fixed on the top, left side, right side and bottom of the main frame 1 , wherein the fixed cross bar 12 on the right side extends into the main frame 1 until it meets the connection and fixation requirements of the built-in oblique frame 11 .

[0041] The air duct frame is composed of a main support and an air duct frame connection part, wherein the main support part has a size of 980mm×272mm×270mm (length, width, height); the air duct frame connection part has 3 groups, with a height of 120mm, which are respectively fixed to the diffusion section, the honeycomb section and the contraction section through the air duct connection piece 101. The air duct frame is independent of the total vibration frame, and the distance between the air duct frame and the screen can be adjusted as required after being connected to the air duct.

[0042] like Figure 1 and Figure 6 As shown, the main frame 1 and the built-in oblique frame 11 of this embodiment are both in a cubic structure, and reinforcing ribs 17 are provided between the cross beam 16 and the vertical beam 15 of the main frame 1 and between the fixed cross bar 12 and the vertical beam 15 for strengthening connection, and reinforcing rods 190 are provided between the cross bar 18 and the vertical bar 19 of the built-in oblique frame 11 for strengthening connection; the main structure of the crank connecting rod driving mechanism is installed on the built-in oblique frame 11 through the driving structure frame 46. By providing reinforcing ribs and reinforcing rods, the structural strength of the entire vibration frame is higher, and the vibration experiment is more stable and reliable.

[0043] Moreover, in order to facilitate the connection of the vibration rails, two sets of rail fixing square tube aluminum profiles are also provided on the built-in inclined frame 11 for installing the two sets of vibration rails. The number of each set of rail fixing square tube aluminum profiles can be arbitrary, and the number of each set of vibration rails can also be arbitrary, as long as each set of vibration rails is coaxially arranged.

[0044] In order to make the structure of the entire vibration frame more stable and reliable, a triangular reinforcement plate 191 may be provided between the cross beam 16 and the vertical beam 15 of the main frame 1 .

[0045] like Figure 1 As shown, the corn threshing and air separation multi-condition adjustable parameter detection test bench of this embodiment further includes a wind speed detection unit 6, and the wind speed detection unit 6 is installed above the sieve. By setting the wind speed detection unit, the wind speed can be detected and recorded.

[0046] Specifically, the wind speed detection unit 6 includes a wind speed detection rod 61, a wind speed sensor 62, and a paperless recorder 63. The wind speed sensor 62 is connected to the wind speed detection rod 61 and the paperless recorder 63 respectively. The entire wind speed detection unit 6 is powered by a 24V DC power supply 64. The wind speed detection rod is an S-type pitot tube, which is installed on a plane 30mm above the screen body for detection according to the selection criteria for the detection plane of the agricultural material screen surface; the wind speed sensor is used to detect the wind speed flowing through the wind speed detection rod; the paperless recorder detects, records and stores wind speed information in real time; and the 24V DC power supply is used to power the wind speed sensing system.

[0047] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the screen of this embodiment includes a screen frame 3 and a mesh body 31, the driving end of the crank connecting rod driving mechanism is connected to the screen frame 3, and the mesh body 31 is detachably connected to the screen frame 3. The mesh body 31 of this embodiment is a round hole screen, and the type of the mesh body can be changed as needed.

[0048] like Figure 1 , Figure 7~Figure 10 As shown, preferably, there are two crank connecting rod driving mechanisms, which are respectively arranged on both sides of the screen, and the driving ends of the two crank connecting rod driving mechanisms are respectively connected to the opposite sides of the screen. By arranging two crank connecting rod driving mechanisms, the driving of the screen is more stable and reliable.

[0049] The main frame 1 and the built-in oblique frame 11 of this embodiment can both be made of European-style square tube aluminum profiles, and the specification can be selected to be 40mm×40mm.

[0050] The working process of the corn threshing and air selection multi-condition adjustable parameter detection test bench of this embodiment is as follows: during the test, ensure that the fan is installed at the air inlet section, the wind speed detection part is turned on, the wind speed detection rod is installed on the plane just above the screen, and the connecting hole on the second driving connecting rod is selected according to the test requirements. Turn on the fan and the 24V DC servo motor, and the airflow passes through the airflow output duct to form a small vortex and a fast airflow that impacts the vibrating screen. At this time, the screen is reciprocated by the slider and the vibrating slide rail under the action of the 24V DC servo motor through the first driving connecting rod and the second driving connecting rod. The vibration frequency is recorded by the motor speed, the amplitude is recorded by different amplitude connecting holes, and the wind speed is recorded by the paperless recorder.

[0051] The working principle of the corn threshing and air selection multi-condition adjustable parameter detection test bench of this embodiment is that the present invention is driven by a motor and connected to the screen in conjunction with the first drive connecting rod and the second drive connecting rod, and at the same time, sliders are installed around the screen to make the screen do horizontal reciprocating motion on the vibrating slide rail. The vibrating slide rails are arranged in groups of 2 for every 2, and 2 groups in total, which are installed on two different planes of the built-in inclined frame. The design adopts a structure in which the main frame is nested in the built-in inclined frame to fix the drive and transmission system on the built-in inclined frame, so the angle of the screen is consistent with that of the built-in inclined frame, and both are 55° with the horizontal plane. The airflow forms a small vortex, stable and fast airflow through the airflow output duct. The air outlet section of the airflow output duct is designed to be an inclined plane and parallel to the screen. The air outlet section is regarded as a horizontal plane, and the horizontal vibration of the screen can be simulated as the vibration operation state of the cleaning screen during the operation of the grain harvester. The amplitude can be changed by changing the connecting hole of the second drive connecting rod, and the vibration frequency can be changed by changing the motor speed.

[0052] The corn threshing and air selection parameter detection test bench of this embodiment with adjustable multiple working conditions, by setting a vibration frame, a vibration slide rail and an airflow output duct, and cooperating with a crank connecting rod drive mechanism and a screen, converts the vertical vibration of the grain cleaning screen into a lateral movement along the vibration slide rail, solving the problem that the test bench is not easy to build due to the large vertical space occupied by the grain harvester's cleaning operation. By setting a plurality of connecting holes, the screen can be installed on different connecting holes, the amplitude of the screen can be adjusted, the vibration frequency can be changed by changing the speed of the crank connecting rod drive mechanism, and the wind speed can be changed by changing the distance of the air duct outlet, thus solving the problem of a test bench multi-parameter working condition simulation test. This embodiment designs an air duct that is combined with an air inlet, a stable section, a diffusion section, a contraction section, a honeycomb section, a contraction section and an oblique cross-section air outlet, which improves the separation of large vortices into small vortices, promotes the attenuation of vortices and reduces airflow disturbances, so that the airflow is smoothly delivered to the sieve body.

[0053] In the description of the present invention, it should be understood that the terms "lateral", "length", "up", "down", "front", "back", "left", "right", "horizontal", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A corn threshing and air separation parameter detection test bench with adjustable multi-working conditions, characterized in that: It comprises a vibration frame, two sets of vibration slide rails arranged in parallel, a screen, a crank connecting rod driving mechanism and an airflow output duct, wherein the vibration slide rail is installed on the vibration frame horizontally or horizontally, the screen is arranged obliquely and slidably connected to the two sets of vibration slide rails on opposite sides, the driving end of the crank connecting rod driving mechanism is connected to the screen and drives the screen to reciprocate along the vibration slide rail; the air outlet of the airflow output duct is located obliquely below the screen and arranged parallel to the screen; The driving end of the crank connecting rod driving mechanism is provided with a plurality of connecting holes for respectively connecting to the screen meshes.

2. According to claim 1, a corn threshing and air separation parameter detection test bench with adjustable multi-working conditions, characterized in that: The crank-connecting rod driving mechanism includes a driving part, a first driving connecting rod and a second driving connecting rod. The power output shaft of the driving part is vertically fixedly connected to one end of the first driving connecting rod, the other end of the first driving connecting rod is vertically hinged to one end of the second driving connecting rod, and the other end of the second driving connecting rod is provided with a plurality of the connecting holes.

3. According to claim 2, a parameter detection test bench with adjustable multi-conditions for corn threshing and air separation, characterized in that: The plurality of connecting holes are arranged in sequence and spaced apart along the length direction of the second driving connecting rod.

4. According to claim 1, a corn threshing and air separation parameter detection test bench with adjustable multi-working conditions, characterized in that: The crank-connecting rod driving mechanism is installed below the screen and the air outlet of the airflow output duct; when the screen moves back and forth under the drive of the crank-connecting rod driving mechanism, the air outlet of the airflow output duct is always arranged opposite to the screen.

5. According to claim 1, a parameter detection test bench with adjustable multi-working conditions for corn threshing and air separation, characterized in that: The airflow output duct comprises an air inlet section, a diffusion section, a stabilization section, a honeycomb section, a stabilization section and a contraction section which are connected in sequence, and the outlet of the contraction section serves as the air outlet of the airflow output duct.

6. According to claim 1, a corn threshing and air separation parameter detection test bench with adjustable multi-working conditions, characterized in that: The vibration frame comprises a main frame and a built-in oblique frame, the main frame is respectively provided with four fixed cross bars, and eight corners of the built-in oblique frame are respectively installed in pairs on the corresponding fixed cross bars; the vibration slide rail is installed on the built-in oblique frame.

7. A corn threshing and air separation parameter detection test bench with adjustable multi-working conditions according to claim 6, characterized in that: The main frame and the built-in oblique frame are both cubic structures. Reinforcing ribs are provided between the cross beams and vertical beams of the main frame and between the fixed cross bars and vertical beams for strengthening the connection. Reinforcing rods are provided between the cross bars and vertical bars of the built-in oblique frame for strengthening the connection. The main structure of the crank-connecting rod drive mechanism is installed on the built-in oblique frame through a drive structure frame.

8. According to claim 1, a parameter detection test bench with adjustable multi-working conditions for corn threshing and air separation, characterized in that: The utility model also comprises a wind speed detection part, and the wind speed detection part is installed above the screen.

9. A corn threshing and air separation parameter detection test bench with adjustable multi-working conditions according to claim 8, characterized in that: The wind speed detection unit comprises a wind speed detection rod, a wind speed sensor, and a paperless recorder. The wind speed sensor is connected to the wind speed detection rod and the paperless recorder respectively.

10. The corn threshing and air separation multi-condition adjustable parameter detection test bench according to claim 1, characterized in that: There are two crank-connecting rod driving mechanisms, which are respectively arranged on both sides of the screen, and the driving ends of the two crank-connecting rod driving mechanisms are respectively connected to the opposite sides of the screen.

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