A grain impurity analyzer

Abstract

The present application relates to the technical field of agricultural machinery, and provides a grain impurity analyzer, which comprises a screening mechanism, the screening mechanism comprises a vibrating device and a screening assembly in transmission connection with the vibrating device, the screening assembly eccentrically vibrates under the drive of the vibrating device, so that the grain to be analyzed in the screening assembly vibrates along a preset direction, and the preset direction is at least two directions; the screening assembly is provided with a feeding port, a first discharging port and a second discharging port; an impurity weighing device, the first discharging port is in communication with the feeding port of the impurity weighing device, so that the impurities screened out by the screening mechanism enter the impurity weighing device for weighing; and a clean grain weighing device, the second discharging port is in communication with the feeding port of the clean grain weighing device, so that the grain screened out by the screening mechanism enters the clean grain weighing device for weighing. The precision of impurity screening is improved, and the weighing accuracy is ensured.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a grain impurity analyzer. Background Technology

[0002] Grains typically include common crops such as wheat, corn, or peanuts. Taking wheat as an example, grains usually contain impurities of varying sizes, either large or small. These impurities need to be removed before processing, and quality testing is required during the purchasing, storage, and transportation stages.

[0003] Existing grain impurity analyzers use dual-axis rotary motors to screen grains. The grains can only vibrate in one direction on the screen of the screening mechanism, which cannot cooperate with the screen structure to complete the automatic screening and discharge of grains. At the same time, during use, grains or impurities tend to accumulate in the middle of the screen, causing some grains or impurities to fail to be discharged automatically. Furthermore, when performing quality testing, existing grain impurity analyzers weigh the grains at the inlet and outlet separately and use the difference between the two weights to determine the quality of qualified grains. This method has poor detection accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a grain impurity analyzer to at least partially solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A grain impurity analyzer, comprising:

[0007] A screening mechanism includes a vibrating device and a screening assembly driven by the vibrating device. The screening assembly vibrates eccentrically under the drive of the vibrating device to make the grain to be analyzed in the screening assembly vibrate in a preset direction, wherein the preset direction is at least two directions. The screening assembly has a feed inlet, a first discharge outlet, and a second discharge outlet.

[0008] An impurity weighing device, wherein the first discharge port is connected to the inlet of the impurity weighing device, so that the impurities screened out by the screening mechanism enter the impurity weighing device for weighing;

[0009] The clean grain weighing device has a second discharge port connected to the feed port of the clean grain weighing device, so that the grain screened by the screening mechanism enters the clean grain weighing device for weighing.

[0010] In some embodiments, the impurity weighing device includes a large impurity weighing device and a light impurity weighing device, and the first discharge port includes a large impurity discharge port and a light impurity discharge port. The large impurity discharge port is connected to the feed port of the large impurity weighing device, and the light impurity discharge port is connected to the feed port of the light impurity weighing device.

[0011] In some embodiments, the screening component includes:

[0012] The upper screen includes a first screen at the bottom and a first sidewall in the circumferential direction. The first screen and the first sidewall form an upper screening chamber. The large impurity discharge port is opened on the first sidewall.

[0013] The middle layer screen includes a second screen located at the bottom and a second side wall located in the circumferential direction. The second screen and the second side wall form a middle layer screening cavity. The first screen is disposed between the upper layer screening cavity and the middle layer screening cavity. The second discharge port is opened on the second side wall.

[0014] The lower receiving hopper has a second screen located between the middle screening chamber and the lower receiving hopper, and the light impurity discharge port is located on the side wall of the lower receiving hopper.

[0015] In some embodiments, a first conical hopper is provided at the middle position of the first screen, and the first conical hopper protrudes upward relative to the screen surface of the first screen; and / or,

[0016] A second cone is provided in the middle of the second screen, and the second cone protrudes upward relative to the screen surface of the second screen.

[0017] In some embodiments, the vibration device includes:

[0018] A dual-axis motor is mounted on the screening mechanism via a connecting plate. The dual-axis motor includes a first output shaft and a second output shaft.

[0019] A counterweight, wherein the counterweight is mounted on the first output shaft;

[0020] An eccentric mechanism is installed inside the connecting plate. The eccentric mechanism includes a connecting block and an arc-shaped slide rail fixedly connected to the connecting block. The connecting block is fixedly connected to the second output shaft, and a slider is slidably installed in the arc-shaped slide rail.

[0021] In some embodiments, the upper sieve further includes:

[0022] A first pusher plate is disposed in the upper screening chamber. One end of the first pusher plate is rotatably mounted on the inner side of the first side wall via a first hinge. The first pusher plate can swing around the first hinge.

[0023] In some embodiments, the upper sieve further includes:

[0024] A first folding baffle, one end of which is installed on the inner side of the first sidewall and obstructs the first fold; and / or,

[0025] The first discharge baffle is installed at one end on the inner side of the first sidewall and blocks the large waste discharge port.

[0026] In some embodiments, the intermediate screen further includes:

[0027] The second pusher plate is disposed in the middle screening chamber. One end of the second pusher plate is rotatably mounted on the inner side of the second side wall via a second hinge. The second pusher plate can swing around the second hinge.

[0028] In some embodiments, the intermediate screen further includes:

[0029] A second folding baffle, one end of which is installed on the inner side of the second sidewall and obstructs the second fold; and / or,

[0030] The second discharge baffle is installed at one end on the inner side of the second side wall and blocks the second discharge port.

[0031] In some embodiments, the first screen and / or the second screen are provided with a vibrating structure.

[0032] In some embodiments, the vibration device further includes:

[0033] A connecting plate having a first opening, the counterweight being connected to the first output shaft via the connecting plate, and the first output shaft passing through the first opening;

[0034] The connecting block has a second opening, and the eccentric mechanism is connected to the second output shaft through the connecting block, with the second output shaft passing through the second opening.

[0035] In some embodiments, the slider is provided with a ball bearing, which is rotatably mounted on the slider and located on at least one contact surface where the slider contacts the arc-shaped slide.

[0036] In some embodiments, a mounting hole is provided on the contact surface of the slider, and the ball is rotatably fitted into the mounting hole.

[0037] In some embodiments, the general-purpose weighing device includes:

[0038] General-purpose weighing scale;

[0039] A mixed material feeding channel, which is connected to the mixed material discharge port;

[0040] A large miscellaneous material discharge valve is provided in the large miscellaneous material feeding channel and can open or close the large miscellaneous material feeding channel.

[0041] A mixed waste weighing hopper is located at the bottom end of the mixed waste feeding channel and is connected to the mixed waste feeding channel. The mixed waste weighing hopper is installed on the mixed waste weighing scale.

[0042] In some embodiments, the large-item weighing device further includes:

[0043] A large mixed material hopper is detachably mounted on the support frame of the grain analyzer.

[0044] In some embodiments, the light and miscellaneous weighing device includes:

[0045] Lightweight and miscellaneous weighing scale;

[0046] A light and mixed material feeding channel, which is connected to the light and mixed material discharge port;

[0047] A light and impurity discharge valve is provided in the light and impurity feed channel and can open or close the light and impurity feed channel.

[0048] A light impurity weighing hopper is provided at the bottom end of the light impurity feed channel and is connected to the light impurity feed channel. The light impurity weighing hopper is installed on the light impurity weighing scale.

[0049] In some embodiments, the light and miscellaneous weighing device further includes:

[0050] A light impurity receiving hopper is detachably mounted on the support frame of the grain analyzer.

[0051] In some embodiments, the cleaned grain weighing device includes:

[0052] Grain weighing scale;

[0053] A grain feeding channel, which is connected to the grain discharge port;

[0054] A grain feeding valve is provided in the grain feeding channel and can open or close the grain feeding channel.

[0055] A grain weighing hopper is located at the bottom of the grain feeding channel and is connected to the grain feeding channel. The grain weighing hopper is installed on a grain weighing scale.

[0056] In some embodiments, the cleaned grain weighing device further includes:

[0057] A light and impurity separator is disposed between the grain feed channel and the grain discharge port;

[0058] The light impurity separator includes a feed inlet, a baffle, an impurity removal port connected to the impurity removal negative pressure pipeline, and an impurity removal discharge port. The baffle is disposed between the feed inlet and the impurity removal port.

[0059] In some embodiments, the cleaned grain weighing device further includes:

[0060] A negative pressure conveying pipeline is connected to the grain receiving hopper so as to draw grain from the grain receiving hopper into the downstream inspection platform.

[0061] In one or more of the above specific embodiments, the grain impurity analyzer provided by the present invention has the following technical effects:

[0062] (1) In the grain impurity analyzer provided by the present invention, the screening mechanism has multiple discharge ports and correspondingly sets multiple weighing devices. During the working process, various impurities and grains can be accurately discharged to the corresponding weighing devices. Grains and impurities are weighed in their respective weighing devices. The accuracy and range of the weighing devices can be set according to the estimated value of grains and impurities, which improves the weighing accuracy and ensures the accurate calculation of impurity content. It can be widely used in the detection of impurity content of various materials.

[0063] (2) In the grain impurity analyzer provided by the present invention, the screening mechanism adopts a dual-axis rotary drive device, and by designing the eccentric mechanism as an arc-shaped slide, when the dual-axis rotary drive device rotates in one direction during operation, the counterweight moves along the arc-shaped slide to one end of the eccentric mechanism, causing the grain to vibrate on the screen in a clockwise or counterclockwise direction; when the dual-axis rotary drive device changes its rotation direction, the counterweight moves along the arc-shaped slide to the other end of the eccentric mechanism, thereby changing the vibration direction of the grain on the screen; the grain vibration direction can be changed by changing the angle of the counterweight axis without stopping the operation of the dual-axis rotary drive device, thus realizing bidirectional vibration of the grain and automatic discharge.

[0064] (3) In the grain impurity analyzer provided by the present invention, the screening mechanism further includes a first pusher plate and / or a second pusher plate. When the grain vibrates along the direction of extension of the first pusher plate and / or the second pusher plate (i.e., the first direction), the grain moves along the inner surface of the pusher plate and will not be discharged from the discharge port blocked by the first pusher plate and / or the second pusher plate. After screening is completed, the vibration direction of the grain changes after the rotation direction of the dual-axis rotary drive device changes accordingly, and the grain will be discharged along the grain discharge channel between the first pusher plate and / or the second pusher plate and the corresponding side wall, thus realizing automatic discharge. Through the cooperation of the first pusher plate and / or the second pusher plate with the bidirectional rotary structure, compared with the existing screening mechanism which can only complete the discharge by opening the discharge port when the grain vibrates in one direction, automation and efficiency are achieved. In particular, automatic discharge is completed by changing the vibration direction of the grain, which has obvious technical advantages.

[0065] (4) In the grain impurity analyzer provided by the present invention, each screen of the screening mechanism is provided with a cone bucket in the middle. The cone bucket can agitate the grain or impurities during screening, avoid material accumulation in the middle of the screen, effectively prevent grain or impurities from remaining on the screen, and improve the accuracy of impurity content calculation. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is one of the overall structural schematic diagrams of a grain impurity analyzer provided in an embodiment of the present invention;

[0068] Figure 2 This is a second schematic diagram of the overall structure of a grain impurity analyzer provided in an embodiment of the present invention;

[0069] Figure 3 This is a schematic diagram of the overall structure of a screening mechanism provided in an embodiment of the present invention;

[0070] Figure 4 This is one of the structural schematic diagrams of the upper screen in a screening mechanism provided in an embodiment of the present invention;

[0071] Figure 5 This is one of the structural schematic diagrams of the middle layer screen in a screening mechanism provided in an embodiment of the present invention;

[0072] Figure 6 This is a schematic diagram of the structure of the lower receiving bin in a screening mechanism provided in an embodiment of the present invention;

[0073] Figure 7 This is a schematic diagram of the structure of the light impurity separator in a screening mechanism provided in an embodiment of the present invention;

[0074] Figure 8 This is a schematic diagram of the structure of the base and the vibration device in a screening mechanism provided in an embodiment of the present invention;

[0075] Figure 9 This is a schematic diagram of the structure of the vibration device in a screening mechanism provided in an embodiment of the present invention;

[0076] Figure 10 This is a second schematic diagram of the upper screen structure in a screening mechanism provided in an embodiment of the present invention;

[0077] Figure 11 This is a second schematic diagram of the structure of the middle layer screen in a screening mechanism provided in an embodiment of the present invention.

[0078] The attached figures are labeled as follows:

[0079] 1-Screening mechanism, 2-Weighing device for large impurities, 3-Weighing device for light impurities, 4-Weighing device for clean grain, 5-Box body;

[0080] 11-Vibration device; 12-Screening assembly;

[0081] 111-Dual-axis motor, 112-First output shaft, 113-Second output shaft, 114-Counterweight;

[0082] 115-Connecting plate, 116-Arc-shaped slide, 117-Connecting block, 118-Slider, 119-Connecting plate;

[0083] 121-Upper screen, 1211-First screen, 1212-First side wall, 1213-Large debris discharge port;

[0084] 1214 - First cone hopper, 1215 - First pusher plate, 1216 - First hinge, 1217 - First hinge baffle;

[0085] 1218 - First discharge baffle, 1219 - First adjusting rod, 12110 - First locking rod;

[0086] 12111 - First observation hole;

[0087] 122-Middle layer screen, 1221-Second screen, 1222 Second side wall, 1223-Second discharge port;

[0088] 1224 - Second cone hopper, 1225 - Second pusher plate, 1226 - Second hinge, 1227 - Second hinge baffle;

[0089] 1228 - Second discharge baffle, 1229 - Second adjusting rod, 12210 - Second locking rod;

[0090] 12211 - Second observation hole, 123 - Lower receiving bin, 1231 - Light impurity discharge port;

[0091] 124 - Spring, 125 - Base, 126 - Cushion pad;

[0092] 21-Miscellaneous feed channel, 22-Miscellaneous discharge valve, 23-Miscellaneous weighing hopper, 24-Miscellaneous receiving hopper;

[0093] 31-Light and impurity feed channel; 32-Light and impurity discharge valve; 33-Light and impurity weighing hopper; 34-Light and impurity receiving hopper;

[0094] 41-Grain feed channel, 42-Grain discharge valve, 43-Grain weighing hopper, 44-Light and impurity separator;

[0095] 45-Conveying negative pressure pipeline, 451-Baffle, 452-Impurity removal port, 453-Impurity removal discharge port;

[0096] 51-Box door, 52-Observation window, 53-Support frame. Detailed Implementation

[0097] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0098] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0099] To address the technical problems of poor impurity screening accuracy and low weighing accuracy of the screened grains and various impurities in the analysis of wheat and other grains in existing technologies, this invention provides a grain impurity analyzer to improve the accuracy of impurity screening and ensure weighing accuracy.

[0100] In one specific implementation, such as Figure 1 and Figure 2 As shown, the grain impurity analyzer provided by the present invention includes a screening mechanism 1, an impurity weighing device, and a clean grain weighing device 4. The screening mechanism 1 includes a vibration device 11 and a screening component 12 pulsatingly connected to the vibration device 11. The screening component 12 vibrates eccentrically under the drive of the vibration device 11, causing the grain to be analyzed in the screening component 12 to vibrate along a preset direction, which may be at least two directions, such as clockwise and counterclockwise. The screening component 12 has a feed inlet, a first discharge port, and a second discharge port 1223. The first discharge port is connected to the feed inlet of the impurity weighing device, allowing the impurities screened by the screening mechanism 1 to enter the impurity weighing device for weighing. The second discharge port 1223 is connected to the feed inlet of the clean grain weighing device 4, allowing the grain screened by the screening mechanism 1 to enter the clean grain weighing device 4 for weighing.

[0101] In actual products, the main components of the grain impurity analyzer can be integrated into a single housing 5. An openable door 51 is provided on the front of the housing 5, and an observation window 52 is provided on the door 51 or on the side wall of the housing 5 to facilitate observation of the analyzer's internal workings. Multiple support frames 53 can be installed inside the housing 5 to mount core components such as the screening mechanism 1, the clean grain weighing device 4, and the impurity weighing device.

[0102] To further distinguish impurities and improve the accuracy of impurity weighing, impurities can be screened out and discharged separately. In some embodiments, the impurity weighing device includes a large impurity weighing device 2 and a light impurity weighing device 3. The first discharge port includes a large impurity discharge port 1213 and a light impurity discharge port 1231. The large impurity discharge port 1213 is connected to the inlet of the large impurity weighing device 2, and the light impurity discharge port 1231 is connected to the inlet of the light impurity weighing device 3. That is, the impurity weighing device can be further divided into a large impurity weighing device 2 and a light impurity weighing device 3 according to the nature of the impurities. Correspondingly, the first discharge port includes a large impurity discharge port 1213 and a light impurity discharge port 1231. Then, the screening component 12 has three discharge ports: a large impurity discharge port 1213 for large impurities, a light impurity discharge port 1231 for light impurities, and a second discharge port 1223 for the grain after impurities have been screened out.

[0103] During operation, to ensure accurate measurement, the grain is typically quantitatively sieved. A batch of grain to be analyzed, for example, 2.5 kg of grain, is fed into the screening assembly 12 through the inlet. Larger impurities sieved by the assembly 12 enter the large impurity weighing device 2 through the large impurity discharge port 1213 to obtain their weight. Lighter impurities sieved by the assembly 12 enter the light impurity weighing device 3 through the light impurity discharge port 1231 to obtain their weight. The remaining grain after sieving by the assembly 12 enters the clean grain weighing device 4 through the second discharge port 1223 to obtain its weight. By weighing each component separately, a relatively accurate weight of each component can be obtained. The grain to be analyzed can be wheat, corn, or peanuts, etc.

[0104] A display screen can also be installed on the box 5. The weighing results can be output on the display screen so that the staff can see the weighing results intuitively.

[0105] In some embodiments, please refer to Figure 1 and Figure 2 The mixed material weighing device 2 includes a mixed material weighing scale, a mixed material feeding channel 21, a mixed material discharge valve 22, and a mixed material weighing hopper 23; wherein, the mixed material feeding channel 21 is connected to the mixed material discharge port 1213, the mixed material discharge valve 22 is disposed in the mixed material feeding channel 21 and opens or closes the mixed material feeding channel 21; the mixed material weighing hopper 23 is disposed at the bottom end of the mixed material feeding channel 21 and is connected to the mixed material feeding channel 21, and the mixed material weighing hopper 23 is installed on the mixed material weighing scale.

[0106] During operation, when the screening mechanism 1 is in the screening working state, the large impurity discharge valve 22 is in the closed state. After a preset time, the screening working state ends, and when the screening mechanism 1 enters the discharge working state, the large impurity discharge valve 22 is opened. At this time, the large impurity feeding channel 21 is opened, and the large impurities screened by the upper screen layer enter the large impurity weighing hopper 23 through the large impurity feeding channel 21, and the large impurities are weighed by the large impurity weighing device.

[0107] Since the screening mechanism 1 screens materials in batches, with one batch screened before the next batch is screened, the large impurities weighed by the large impurity metering device each time correspond to the large impurities in each batch of material. However, since the amount of large impurities in each batch is small, discharging them after each weighing is cumbersome. Therefore, in some embodiments, the large impurity weighing device 2 also includes a large impurity receiving hopper 24, which is detachably installed on the support frame 53 of the grain analyzer. This allows the weighed large impurities to be temporarily stored in the large impurity receiving hopper 24 after each batch is weighed. Once the hopper is full, it can be removed from the support frame 53 and the large impurities poured into a designated location, reducing the workload of emptying the material. Specifically, the large impurity receiving hopper 24 can be in the form of a drawer; once full, it can be pulled out for emptying.

[0108] In some embodiments, such as Figure 1 and Figure 2 As shown, the light and miscellaneous weighing device 3 includes a light and miscellaneous weighing scale, a light and miscellaneous feeding channel 31, a light and miscellaneous discharge valve 32, and a light and miscellaneous weighing hopper 33; wherein, the light and miscellaneous feeding channel 31 is connected to the light and miscellaneous discharge port 1231, the light and miscellaneous discharge valve 32 is disposed in the light and miscellaneous feeding channel 31, and opens or closes the light and miscellaneous feeding channel 31; the light and miscellaneous weighing hopper 33 is disposed at the bottom end of the light and miscellaneous feeding channel 31 and is connected to the light and miscellaneous feeding channel 31, and the light and miscellaneous weighing hopper 33 is installed on the light and miscellaneous weighing scale.

[0109] During operation, when the screening mechanism 1 is in the screening working state, the light impurity discharge valve 32 is in the closed state. After a preset time, the screening working state ends and the screening mechanism 1 enters the discharge working state. At this time, the light impurity discharge valve 32 is opened, and the light impurity feed channel 31 is opened. The screened light impurities enter the light impurity weighing hopper 33 through the light impurity feed channel 31, and the light impurity weighing is completed by the light impurity weighing hopper.

[0110] Since the screening mechanism 1 screens materials in batches, with one batch screened before the next batch is screened, the light impurities weighed by the light impurity metering device each time correspond to the light impurities in each batch of material. However, since the amount of light impurities in each batch is small, discharging them after each weighing is cumbersome. Therefore, in some embodiments, the light impurity weighing device 3 also includes a light impurity receiving hopper 34, which is detachably mounted on the support frame 53 of the grain analyzer. This allows the weighed light impurities to be temporarily stored in the light impurity receiving hopper 34 after each batch is weighed. Once the hopper is full, it can be removed from the support frame 53 and the light impurities poured into a designated location, reducing the workload of emptying the material. Specifically, the light impurity receiving hopper 34 can be in the form of a drawer; once full, it can be pulled out for emptying.

[0111] In some embodiments, such as Figure 1 and Figure 2 As shown, the clean grain weighing device 4 includes a grain weighing scale, a grain feeding channel 41, a grain discharge valve 42, and a grain weighing hopper 43. The grain feeding channel 41 is connected to the grain discharge port. The grain discharge valve 42 is located inside the grain feeding channel 41 and can open or close the grain feeding channel 41. The grain weighing hopper 43 is located at the bottom of the grain feeding channel 41 and is connected to the grain feeding channel 41. The grain weighing hopper 43 is installed on the grain weighing scale.

[0112] During operation, when the screening mechanism 1 is in the screening working state, the grain discharge valve 42 is in the closed state. After a preset time, the screening working state ends and the screening mechanism 1 enters the discharge working state. At this time, the grain discharge valve 42 is opened, and the grain feeding channel 41 is opened. The screened grain enters the grain weighing hopper 43 through the grain feeding channel 41, and the grain weighing scale is used to complete the weighing of large miscellaneous items.

[0113] The clean grain weighing device 4 also includes a conveying negative pressure pipeline 45, which is connected to the grain discharge bin so as to suck the grain in the grain receiving hopper into the downstream inspection platform.

[0114] In this way, by setting multiple material discharge ports in the screening mechanism 1 of the grain impurity analyzer and setting multiple weighing devices accordingly, various impurities and grains can be accurately discharged to the corresponding weighing devices during operation. Grains and impurities are weighed in their respective weighing devices. The accuracy and range of the weighing devices can be set according to the estimated value of grains and impurities, which improves the weighing accuracy and ensures the accurate calculation of impurity content. It can be widely used in the detection of impurity content in various materials.

[0115] In some embodiments, to accommodate multiple material discharge ports, the screening assembly 12 can be a multi-layer screen structure, such as... Figure 3 As shown, the screening component 12 includes an upper screen 121, a middle screen 122, and a lower receiving hopper 123. The upper screen 121 is used to screen out larger impurities (i.e., large impurities) from the grain to be analyzed. The grain to be analyzed after removing large impurities enters the middle screen 122, where smaller impurities (i.e., small impurities or light impurities) are screened out. The screened light impurities fall into the lower receiving hopper 123, and the screened grain falls into the clean grain weighing device 4 through the second discharge port 1223.

[0116] Specifically, such as Figure 4As shown, the upper sieve 121 includes a first screen 1211 at the bottom and a first side wall 1212 in the circumferential direction. The first screen 1211 and the first side wall 1212 form the upper sieve 121 compartment. The large impurity discharge port 1213 is opened in the first side wall 1212. When the grain to be analyzed enters the screening component 12 through the feed port, it falls into the upper sieve 121 compartment and is screened by the first screen 1211 in the upper sieve 121 compartment. The grain and light impurities fall into the next layer of the middle sieve 122 through the mesh of the first screen 1211. The large impurities enter the large impurity weighing device 2 through the large impurity discharge port 1213 and are weighed by the large impurity weighing device 2.

[0117] like Figure 5 As shown, the middle sieve 122 includes a second screen 1221 at the bottom and a second sidewall 1222 in the circumferential direction. The second screen 1221 and the second sidewall 1222 form a compartment of the middle sieve 122. The first screen 1211 is disposed between the compartment of the upper sieve 121 and the compartment of the middle sieve 122. The second discharge port 1223 is opened on the second sidewall 1222. The grain to be analyzed (which includes grain and light impurities) that has been screened by the upper sieve 121 falls into the compartment of the middle sieve 122 and is screened by the second screen 1221 in the compartment of the middle sieve 122. The light impurities fall into the lower receiving hopper 123 of the next layer through the mesh of the second screen 1221. The grain enters the clean grain weighing device 4 through the grain discharge port and is weighed by the grain weighing device.

[0118] like Figure 6 As shown, the second screen 1221 is disposed between the middle screen 122 compartment and the lower receiving bin 123. The light impurity discharge port 1231 is opened on the side wall of the lower receiving bin 123. Light impurities enter the light impurity weighing device 3 through the light impurity discharge port 1231, and are weighed by the light impurity weighing device. To avoid material accumulation, the bottom of the lower receiving bin 123 has a conical structure.

[0119] It should be understood that the mesh size of the second screen 1221 is smaller than that of the first screen 1211.

[0120] Because the screening component 12 vibrates during operation, flexible pipelines are installed between the large waste discharge port 1213 and the inlet of the large waste weighing device 2, between the light waste discharge port 1231 and the inlet of the light waste weighing device 3, and between the grain discharge port and the inlet of the clean grain weighing device 4 to avoid collisions and damage to components caused by rigid connections. For example, a cloth bag (not shown in the figure) is used to connect the corresponding discharge port and inlet. One end of the cloth bag is fixed to the discharge port with a clamp, and the other end of the cloth bag is fixed to the corresponding inlet with a clamp.

[0121] To further improve the accuracy of grain weighing, the grain can first pass through a light and impurity separator 44 before entering the clean grain weighing device 4 for secondary separation of light and impurities, such as... Figure 7 As shown, the light impurity separator 44 is disposed between the grain feed channel 41 and the grain discharge port; the light impurity separator 44 includes a feed port, a baffle 451, an impurity removal port 452 connected to the impurity removal negative pressure pipeline, and an impurity removal discharge port 453, wherein the baffle 451 is disposed between the feed port and the impurity removal port 452. For ease of description, ... Figure 7 Taking the direction shown as an example, grains with a small amount of light impurities enter the feed inlet of the light impurity separator 44 and move downwards in the channel on the left side of the baffle 451. The impurity removal port 452 is connected to the negative pressure pipeline. When the grains reach the bottom position of the baffle 451, the small amount of light impurities mixed in the grains are sucked out through the negative pressure pipeline. The remaining grains continue to descend and enter the clean grain weighing device 4 through the impurity removal outlet 453.

[0122] In this specific embodiment, the grain impurity analyzer provided by the present invention includes a screening mechanism 1 for automatically screening impurities and grains. The screening mechanism 1 is installed in the housing 5 of the grain impurity analyzer. Below the three discharge ports of the screening mechanism 1, a large impurity weighing device 2, a clean grain weighing device 4, and a light impurity weighing device 3 are respectively arranged. Large impurities directly enter the large impurity weighing device 2, the screened grains directly enter the clean grain weighing device 4, and light impurities directly enter the light impurity weighing device 3 or enter the light impurity weighing device 3 via a light impurity separator 44. The grains separated by the light impurity separator 44 enter the clean grain weighing device 4. This grain impurity analyzer is used for separating powdery and granular grains. By changing the internal screen, it can be used for screening materials of various sizes. The screening process has two modes: screening and discharge. The screening amplitude is selectable, the frequency is adjustable, the structure is ingeniously designed, robust and durable, with low noise, no mixing, and no residue. It can be widely used for detecting the impurity content of various materials.

[0123] During the operation of the screening mechanism 1, the screens (including the first screen 1211 and the second screen 1221) rotate and vibrate simultaneously. During rotation, due to centrifugal force, material accumulates in the middle of the screens. To solve the problem of material accumulation, the grain impurity analyzer provided by this invention has a conical hopper in the middle of each screen in the screening mechanism 1. The conical hopper can agitate the grain or impurities during screening, preventing material from accumulating in the middle of the screen. This effectively avoids grain or impurities remaining on the screen and improves the accuracy of impurity content calculation.

[0124] Specifically, such as Figure 4As shown, a first conical hopper 1214 is provided in the middle of the first screen 1211. The first conical hopper 1214 protrudes upward relative to the screen surface of the first screen 1211, and the inclined surface of the protrusion agitates the material, preventing material accumulation and residue. Figure 5 As shown, a second conical hopper 1224 is provided in the middle of the second screen 1221. The second conical hopper 1224 protrudes upward relative to the screen surface of the second screen 1221, and the protruding inclined surface agitates the material, preventing material accumulation and residue. In addition, the bottom wall of the lower receiving bin 123 is also in the form of an integral conical hopper. The first conical hopper 1214, the second conical hopper 1224, and the integral conical hopper ensure that the material does not accumulate on the screen, preventing impurities from being unable to be discharged. Two first observation holes 12111 are provided on the side wall of the upper screen 121, and two second observation holes 12211 are provided on the side wall of the middle screen 122. One of the two observation holes in the same layer is used for illumination, and the other is used for observation to check for the presence of grain or impurities. When not in use, the first observation hole 12111 and the second observation hole 12211 are plugged with rubber stoppers.

[0125] In some embodiments, to prevent material from clogging the mesh, a vibration structure may be provided in the first screen 1211 and / or the second screen 1221. The vibration structure in the first screen 1211 is a columnar object movably placed in the first screening chamber. The columnar object bounces up and down repeatedly with the vibration of the first screen 1211 to strike the first screen 1211, squeezing out materials such as straw that are clogging the first screen 1211 and preventing clogging. The vibration structure in the second screen 1221 is a ball movably placed in the second screening chamber. The ball bounces up and down repeatedly with the vibration of the second screen 1221 to strike the second screen 1221, shaking off materials clogging the second screen 1221 and preventing clogging.

[0126] In some embodiments, such as Figure 8 and Figure 9 As shown, the vibration device 11 includes a dual-axis motor 111, a counterweight 114, and an eccentric mechanism. The dual-axis motor 111 is mounted on the screening mechanism 1 via a connecting plate 115. The dual-axis motor 111 includes a first output shaft 112 and a second output shaft 113. The counterweight 114 is mounted on the first output shaft 112. The eccentric mechanism is mounted inside the connecting plate 115. The eccentric mechanism includes a connecting block 117 and an arc-shaped slide rail 116 fixedly connected to the connecting block 117. The connecting block 117 is fixedly connected to the second output shaft 113. A slider 118 is slidably mounted in the arc-shaped slide rail 116.

[0127] The vibration device 11 adopts a dual-axis rotary drive device, and by designing the eccentric mechanism as an arc-shaped slide 116, during operation, when the dual-axis rotary drive device rotates in one direction, the counterweight 114 moves along the arc-shaped slide 116 to one end of the eccentric mechanism, causing the grain to vibrate on the screen in a clockwise or counterclockwise direction; when the dual-axis rotary drive device changes its rotation direction, the counterweight 114 moves along the arc-shaped slide 116 to the other end of the eccentric mechanism, thereby changing the vibration direction of the grain on the screen; the grain vibration direction can be changed by changing the angle of the counterweight axis without stopping the operation of the dual-axis rotary drive device, realizing bidirectional vibration of the grain, thus achieving automatic discharge.

[0128] Furthermore, the vibration device 11 also includes a connecting plate 119, on which a first opening is provided, and the counterweight 114 is connected to the first output shaft 112 through the connecting plate 119, and the first output shaft 112 passes through the first opening; the connecting block 117 is provided with a second opening, and the eccentric mechanism is connected to the second output shaft 113 through the connecting block 117, and the second output shaft 113 passes through the second opening.

[0129] In other words, the vibration device 11 is equipped with a dual-axis motor 111. One output shaft of the dual-axis motor 111 is connected to a counterweight 114 via a connecting plate 119. The other output shaft of the dual-axis motor 111 is connected to an eccentric mechanism via a connecting block 117. An arc-shaped slide 116 is provided inside the eccentric mechanism, and a slider 118 is provided on the arc-shaped slide 116.

[0130] During operation, when the dual-axis motor 111 rotates in one direction, the slider 118 moves along the arc-shaped slide 116 to one end of the eccentric mechanism, causing the grain to vibrate on the screen in a clockwise or counterclockwise direction; when the dual-axis motor 111 changes its rotation direction, the slider 118 moves along the arc-shaped slide 116 to the other end of the eccentric mechanism, changing the vibration direction of the grain on the screen.

[0131] Please continue to refer to this. Figure 8 and Figure 9 The upper motor shaft of the dual-axis motor 111 is the second output shaft 113, which is connected to an eccentric mechanism via a connecting block 117. An arc-shaped slide rail 116 is provided within the eccentric mechanism, and the connecting block 117 is connected at the center of the eccentric mechanism, making the eccentric mechanism symmetrical about the center line connecting the connecting block 117 and the upper motor shaft. A slider 118 is provided within the arc-shaped slide rail 116, sliding along it. Preferably, buffer pads 126 are provided at both ends of the arc-shaped slide rail 116 to prevent the slider 118 from damaging the arc-shaped slide rail 116 due to excessive impact. The lower motor shaft of the dual-axis motor 111 is the first output shaft 112, which is connected to a counterweight 114 via a connecting plate 119.

[0132] Specifically, both the connecting block 117 and the connecting plate 119 are provided with openings, which are connected to the upper motor shaft and the lower motor shaft respectively. The installation angle of the eccentric mechanism and the counterweight 114 can be adjusted through the openings. Each opening is provided with a screw hole. The size of the opening is adjusted by screws, and the connecting block 117 and the connecting plate 119 are fixed on the two motor shafts respectively.

[0133] Furthermore, a dual-axis motor 111 is mounted on the lower surface of the connecting plate 115, and the upper surface of the connecting plate 115 is connected to the screening mechanism 1, transmitting the vibration generated by the vibrating device 11 to the screening mechanism 1. The lower surface of the connecting plate 115 is connected to one end of a plurality of arrayed springs 124, and the other end of the plurality of springs 124 is connected to the base 125, and the lower end of the base 125 is provided with a plurality of shock-absorbing pads.

[0134] To prevent the slider 118 from getting stuck when moving along the arc-shaped slide 116 and to ensure smoothness, a ball bearing is provided on the slider 118. The ball bearing is rotatably mounted on the slider 118 and is located on at least one contact surface where the slider 118 contacts the arc-shaped slide 116.

[0135] Specifically, the contact surface of the slider 118 is provided with a mounting hole, and the ball is rotatably embedded in the mounting hole.

[0136] In this embodiment, when the dual-axis motor 111 rotates clockwise (top view), the slider 118 in the eccentric mechanism moves to position A (see attached diagram). Figure 9When the upper motor shaft connects to the slider 118, a counterclockwise angular offset occurs relative to the center line of the lower motor shaft connects to the counterweight 114 on the horizontal plane. The grain on both screens moves counterclockwise around the center of the screen, thus achieving screening without discharging from the discharge port (which is blocked at the rear of the two push plates). If the dual-shaft motor 111 rotates counterclockwise, the slider 118 in the eccentric mechanism moves to position B, changing the angle between it and the counterweight 114 to a clockwise angular offset (the center line of the upper motor shaft connects to the slider 118 relative to the center line of the lower motor shaft connects to the counterweight 114 on the horizontal plane). At this point, the grain on the screen moves clockwise around the center of the screen and is discharged from the discharge port. By changing the motor rotation direction, the grain moves either clockwise or counterclockwise, thus switching between screening and discharge functions. In existing technologies, because a sliding slider is not used, the eccentric angle is fixed. Whether the motor rotates clockwise or counterclockwise, the material on the screen will only rotate in the same direction, failing to change the material's direction of movement. Alternatively, the dual-shaft motor 111 can be rotated counterclockwise for screening, and then clockwise for discharge. When the screening mechanism 1 can automatically rotate clockwise or counterclockwise, to prevent material accumulation, a pushing structure can be installed in the upper screen 121 and the middle screen 122 to push the material to the middle position, achieving effective screening. For details, please refer to [reference needed]. Figure 4 The upper screen 121 also includes a first pusher plate 1215, which is disposed in the compartment of the upper screen 121. One end of the first pusher plate 1215 is rotatably mounted on the inner side of the first side wall 1212 via a first hinge 1216. The first pusher plate 1215 can swing around the first hinge 1216 to adjust the pushing position according to the material type. The first pusher plate 1215 also has the function of blocking the discharge port to prevent accidental material from falling during screening vibration.

[0137] Furthermore, the upper screen 121 also includes a first folding baffle 1217, one end of which is installed on the inner side of the first side wall 1212 and blocks the first fold 1216. During operation, materials will accumulate at the position of the first fold 1216. By setting the first folding baffle 1217, materials can be effectively prevented from entering the position of the first fold 1216, thus preventing material accumulation and improving material screening performance.

[0138] like Figure 4As shown, in this embodiment, the upper screen 121 may also include a first discharge baffle 1218. One end of the first discharge baffle 1218 is installed on the inner side of the first side wall 1212 and blocks the large impurity discharge port 1213 to prevent material from flying out of the large impurity discharge port 1213 during the screening process. In conjunction with the first pusher plate 1215, it further prevents the occurrence of accidental material discharge.

[0139] Similar to the structure of the upper sieve 121, please continue to refer to [the relevant documentation]. Figure 5 The intermediate screen 122 further includes a second pusher plate 1225, which is disposed in the compartment of the intermediate screen 122. One end of the second pusher plate 1225 is rotatably mounted on the inner side of the second sidewall 1222 via a second hinge 1226. The second pusher plate 1225 can swing around the second hinge 1226 to open or close the second discharge port 1223. This allows for adjustment of the pusher position according to the material type. The second pusher plate 1225 also serves to block the discharge port, preventing accidental material discharge during screening vibration.

[0140] In some embodiments, the middle screen 122 further includes a second folding baffle 1227, one end of which is installed on the inner side of the second sidewall 1222 and blocks the second fold 1226. During operation, material will accumulate at the position of the second fold 1226. By setting the second folding baffle 1227, material can be effectively prevented from entering the position of the second fold 1226, thus preventing material accumulation and improving material screening performance.

[0141] The middle layer screen 122 also includes a second discharge baffle 1228. One end of the second discharge baffle 1228 is installed on the inner side of the second side wall 1222 and blocks the second discharge port 1223 so that the second pusher plate 1225 can work together to achieve the technical effect of avoiding accidental material discharge.

[0142] In the above embodiments, the grain impurity analyzer provided by the present invention further includes a screening mechanism 1 that includes a first pusher plate 1215 and / or a second pusher plate 1225. When the grain vibrates along the direction of extension of the first pusher plate 1215 and / or the second pusher plate 1225 (i.e., the first direction), the grain moves along the inner surface of the pusher plate and will not be discharged from the discharge port blocked by the first pusher plate 1215 and / or the second pusher plate 1225. After screening is completed, the vibration direction of the grain changes after the rotation direction of the dual-axis rotary drive device changes, and the grain will be discharged along the grain discharge channel between the first pusher plate 1215 and / or the second pusher plate 1225 and the corresponding side wall, thus realizing automatic discharge. By cooperating with the first pusher plate 1215 and / or the second pusher plate 1225 and the bidirectional rotating structure, compared with the existing screening mechanism 1 which can only complete the discharge by opening the discharge port when the grain vibrates in one direction, automation and efficiency are achieved. In particular, automatic discharge is completed by changing the vibration direction of the grain, which has obvious technical advantages.

[0143] Based on the above embodiments, in order to improve the operability of the pusher plate, such as Figure 10 and Figure 11 As shown, the first pusher plate 1215 and the second pusher plate 1225 can be adjusted in a counterclockwise direction to change their opening angle. The first adjusting rod 1219 adjusts the opening size of the first pusher plate 1215, and the first locking rod 12110 is used to fix the position of the first pusher plate 1215. The second adjusting rod 1229 adjusts the opening size of the second pusher plate 1225, and the second locking rod 12210 is used to fix the position of the second pusher plate 1225. In this embodiment, the first pusher plate 1215 and the second pusher plate 1225 can also be adjusted in a counterclockwise direction to change their opening angle. Those skilled in the art can determine the setting of the pusher plates based on the vibration direction of the grain generated by the rotation of the dual-axis motor 111 to complete the screening and discharge of the grain.

[0144] It should be noted that, in the absence of conflict, the following embodiments and features can be combined with each other; and, based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0145] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0146] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A grain impurity analyser characterised in that, The utility model relates to a grain screening and weighing device, which comprises the following: a screening mechanism (1) comprising a vibrating device (11) and a screening assembly (12) in transmission connection with the vibrating device (11), the screening assembly (12) being eccentrically vibrated under the drive of the vibrating device (11) to make the grain to be analyzed in the screening assembly (12) vibrate in a preset direction, the preset direction being at least two directions; the screening assembly (12) has a feeding port, a first discharging port and a second discharging port (1223); an impurity weighing device, the first discharging port being in communication with the feeding port of the impurity weighing device to make the impurities screened by the screening mechanism (1) enter the impurity weighing device for weighing; a clean grain weighing device (4), the second discharging port (1223) being in communication with the feeding port of the clean grain weighing device (4) to make the grain screened by the screening mechanism (1) enter the clean grain weighing device (4) for weighing; the vibrating device (11) comprises: a double-shaft motor (111) mounted on the screening mechanism (1) through a connecting disc (115), the double-shaft motor (111) comprising a first output shaft (112) and a second output shaft (113); a counterweight (114) mounted on the first output shaft (112); an eccentric mechanism mounted in the connecting disc (115), the eccentric mechanism comprising a connecting block (117) and an arc-shaped slide (116) fixedly connected with the connecting block (117), the connecting block (117) being fixedly connected with the second output shaft (113), and the arc-shaped slide (116) having a sliding block (118) slidingly mounted therein; the position of the sliding block (118) on the arc-shaped slide (116) changes, so that the eccentric angle of the eccentric mechanism is a positive angle or a negative angle, to make the screening direction clockwise or counterclockwise.

2. The grain impurity analyzer of claim 1, wherein, the vibrating device (11) further comprises: a connecting plate (119) having a first opening formed therein, the counterweight (114) being connected with the first output shaft (112) through the connecting plate (119), and the first output shaft (112) penetrating through the first opening; the connecting block (117) has a second opening formed therein, the eccentric mechanism being connected with the second output shaft (113) through the connecting block (117), and the second output shaft (113) penetrating through the second opening.

3. The grain impurity analyzer of claim 1, wherein, the sliding block (118) is provided with a ball, the ball being rotatably mounted on the sliding block (118) and located on at least one contact surface of the sliding block (118) in contact with the arc-shaped slide (116).

4. The grain impurity analyzer of claim 3, wherein, the contact surface of the sliding block (118) has a mounting hole formed therein, and the ball is rotatably embedded in the mounting hole.

5. The grain impurity analyzer of claim 1, wherein, The impurity weighing device comprises a large-impurity weighing device (2) and a light-impurity weighing device (3), the first discharging port comprises a large-impurity discharging port (1213) and a light-impurity discharging port (1231), the large-impurity discharging port (1213) is connected with the feeding port of the large-impurity weighing device (2), and the light-impurity discharging port (1231) is connected with the feeding port of the light-impurity weighing device (3).

6. The grain impurity analyzer of claim 5, wherein, The screening assembly (12) comprises: an upper layer screen (121), the upper layer screen (121) comprises a first screen mesh (1211) at the bottom and a first side wall (1212) in the circumferential direction, the first screen mesh (1211) and the first side wall (1212) form an upper layer screen (121) cavity, and the large-impurity discharging port (1213) is arranged on the first side wall (1212); a middle layer screen (122), the middle layer screen (122) comprises a second screen mesh (1221) at the bottom and a second side wall (1222) in the circumferential direction, the second screen mesh (1221) and the second side wall (1222) form a middle layer screen (122) cavity, the first screen mesh (1211) is arranged between the upper layer screen (121) cavity and the middle layer screen (122) cavity, and the second discharging port (1223) is arranged on the second side wall (1222); a lower layer receiving bin (123), the second screen mesh (1221) is arranged between the middle layer screen (122) cavity and the lower layer receiving bin (123), and the light-impurity discharging port (1231) is arranged on the side wall of the lower layer receiving bin (123).

7. The grain impurity analyzer of claim 6, wherein, A first cone hopper (1214) is arranged at the middle position of the first screen mesh (1211), and the first cone hopper (1214) is upwardly protruded relative to the screen surface of the first screen mesh (1211); and / or A second cone hopper (1224) is arranged at the middle position of the second screen mesh (1221), and the second cone hopper (1224) is upwardly protruded relative to the screen surface of the second screen mesh (1221).

8. The grain impurity analyzer of claim 6, wherein, The upper layer screen (121) further comprises: a first pushing plate (1215), the first pushing plate (1215) is arranged in the upper layer screen (121) cavity, one end of the first pushing plate (1215) is rotatably installed on the inner side of the first side wall (1212) through a first folding leaf (1216), and the first pushing plate (1215) can swing about the first folding leaf (1216).

9. The grain impurity analyzer of claim 8, wherein, The upper layer screen (121) further comprises: a first folding leaf baffle (1217), one end of the first folding leaf baffle (1217) is installed on the inner side of the first side wall (1212) and shields the first folding leaf (1216); and / or a first discharging baffle (1218), one end of the first discharging baffle (1218) is installed on the inner side of the first side wall (1212) and shields the large-impurity discharging port (1213).

10. The grain impurity analyzer of claim 6, wherein, The middle layer screen (122) further comprises: A second pushing plate (1225) is arranged in the cavity divided by the middle layer screen (122), one end of the second pushing plate (1225) is rotatably mounted to the inner side of the second side wall (1222) through a second fold (1226), and the second pushing plate (1225) can swing around the second fold (1226).

11. The grain impurity analyzer of claim 10, wherein, The middle layer screen (122) further comprises: A second fold stop plate (1227) is mounted to the inner side of the second side wall (1222) and covers the second fold (1226); and / or, A second discharge stop plate (1228) is mounted to the inner side of the second side wall (1222) and covers the second discharge port (1223).

12. The grain impurity analyzer of claim 6, wherein, A rapping structure is arranged in the first screen (1211) and / or the second screen (1221).

13. The grain impurity analyser of any one of claims 5 to 12, characterised in that, The large impurity weighing device (2) comprises: A large impurity metering scale; A large impurity feeding channel (21) which is in communication with the large impurity discharge port (1213); A large impurity discharge valve (22) arranged in the large impurity feeding channel (21) and opening or closing the large impurity feeding channel (21); A large impurity weighing hopper (23) arranged at the bottom end of the large impurity feeding channel (21) and in communication with the large impurity feeding channel (21), the large impurity weighing hopper (23) being mounted on the large impurity metering scale.

14. The grain impurity analyzer of claim 13, wherein, The large impurity weighing device (2) further comprises: A large impurity receiving hopper (24) which is detachably mounted on the support frame (53) of the grain impurity analyzer.

15. The grain impurity analyser of any one of claims 5 to 12, wherein, The light impurity weighing device (3) comprises: A light impurity metering scale; A light impurity feeding channel (31) which is in communication with the light impurity discharge port (1231); A light impurity discharge valve (32) arranged in the light impurity feeding channel (31) and opening or closing the light impurity feeding channel (31); A light impurity weighing hopper (33) arranged at the bottom end of the light impurity feeding channel (31) and in communication with the light impurity feeding channel (31), the light impurity weighing hopper (33) being mounted on the light impurity metering scale.

16. The grain impurity analyzer of claim 15, wherein, The light impurity weighing device (3) further comprises: A light impurity receiving hopper (34) which is detachably mounted on the support frame (53) of the grain impurity analyzer.

17. The grain impurity analyser of any one of claims 5 to 12, wherein, The net grain weighing device (4) comprises: A grain metering scale; A grain feeding channel (41) which is in communication with the grain discharge port; A grain discharge valve (42) arranged in the grain feeding channel (41) and opening or closing the grain feeding channel (41); A grain weighing hopper (43) is arranged at the bottom end of the grain feeding channel (41) and communicates with the grain feeding channel (41), and the grain weighing hopper (43) is installed on a grain metering scale.

18. The grain impurity analyzer of claim 17, wherein, The clean grain weighing device (4) further comprises: A light impurity separator (44) is arranged between the grain feeding channel (41) and the grain discharging opening. The light impurity separator (44) comprises a feeding opening, a baffle (451), a light impurity removal opening (452) communicating with a light impurity removal negative pressure pipeline, and a light impurity removal discharge opening (453), and the baffle (451) is arranged between the feeding opening and the light impurity removal opening (452) of the light impurity separator (44).

19. The grain impurity analyzer of claim 17, wherein, The clean grain weighing device (4) further comprises: A conveying negative pressure pipeline (45) communicates with the grain discharging bin so as to suck the grain in the grain receiving hopper into a downstream inspection platform.

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