Vibration isolation device for early warning of blockage approaching state of separation device and separation device

Abstract

The invention provides a vibration isolation device for early warning of a blockage approaching state of a separation device and the separation device. The vibration isolation device comprises an acceleration sensor, a rubber-damping plate combined bottom plate, a rhombic variable damping structure and a fixed magnet. A plurality of rhombic variable damping structures are arranged between the two rubber-damping plate combined bottom plates, and the acceleration sensor is located above one rubber-damping plate combined bottom plate; and a fixed magnet is arranged below the other rubber-damping plate combined bottom plate. Through the rubber-damping plate combined bottom plate and the rhombic variable damping structure, the interference of low-frequency vibration on monitoring signals of the acceleration sensor can be reduced, and the low-frequency vibration comprises but is not limited to low-frequency vibration generated by vibration sources such as an engine, a header and a conveying mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural harvesting machinery, and in particular to a vibration isolation device for early warning of a blocking state of a separation device and a separation device. Background Art

[0002] With the continuous increase in the feeding volume of combine harvesters in recent years, the problem of blockage of various working parts has become increasingly serious. According to surveys, the proportion of blockage in the threshing and separation links of combine harvesters is relatively large, and the threshing system is the core of the combine harvester. Therefore, there is an urgent need for a means and method to monitor the load state of the threshing device to change the previous situation of relying on the experience of the operator to prevent blockage. At present, the diagnosis of the load state of the threshing device often uses the method of directly measuring the torque and speed of the threshing drum, which can produce certain expected results. However, the torque sensor is large in size, and its application in combine harvesters has certain limitations. In addition, the load state judged by torque or speed has a certain lag, and often cannot achieve the purpose of early warning.

[0003] In agricultural machinery, the efficiency and accuracy of the threshing device are crucial to the threshing effect of crops. There are related studies on using the vibration signal of the outer surface of the threshing device to diagnose the load state of grain threshing. However, since the threshing device of the combine harvester will be affected by low-frequency vibrations from vibration sources including the engine, header, and transportation mechanism during field operation, as well as resonance signal interference, the signal directly received by the traditional acceleration sensor is relatively complex, which is not conducive to subsequent processing and diagnosis of the load state. Therefore, in order to facilitate subsequent signal analysis, the interfering vibration must be removed or weakened.

[0004] Chinese patent CN117759680A discloses a bionic low-frequency vibration isolator to address the problem that adverse vibrations in on-orbit satellites, optical elements and space telescopes will affect the working accuracy of equipment and cause structural deformation and damage. The device has a simple and flexible structure, good vibration isolation performance, and can achieve excellent low-frequency vibration isolation performance within a wide frequency range. However, the vibration isolator targets ultra-low frequency vibrations and cannot effectively isolate the interfering vibration frequency range of the de-separation device. Therefore, it is not suitable for isolating unnecessary vibrations generated in vibration monitoring of the de-separation device of harvesting machinery.

[0005] In order to solve the problem that the vibration of a sampling pump and a pressure reducing pump affects the angular velocity of the vibration foot of the equipment, and thus the strength of the equipment vibration cannot be accurately judged by the magnitude of the acceleration of the equipment foot, Chinese patent CN117869537A discloses a vibration reduction device consisting of a vibration reduction pad, a pressure reducing pump mounting plate, a vibration reduction base plate, a vibration reduction transition plate, and a shock absorber. The device has a simple structure, low cost, and strong environmental adaptability. It can absorb vibrations of different frequencies and amplitudes generated by the pressure reducing pump and the sampling pump, thereby reducing the acceleration of the equipment foot. However, the device may affect the vibration signal generated by the de-separating device of the combine harvester when it is in a blocked state, which is not conducive to subsequent state judgment through signal analysis. Therefore, it is not suitable for application in the de-separating device.

[0006] In view of the problem that once the stiffness and damping parameters of the linear vibration reduction device are determined, its applicable scope is fixed, it is only effective within a certain frequency range, and its environmental adaptability is weak, Chinese patent CN115325086A discloses a new type of combined vibration reduction device with adjustable stiffness and damping to solve the contradiction between the bearing capacity and the vibration reduction frequency band and the contradiction between high-frequency and low-frequency vibration attenuation, and achieve high-performance vibration reduction. However, the device has a complex structure, high cost, and has no significant effect on low-frequency vibration, which is not suitable for the specific requirements of field harvesting.

[0007] In response to the problem that ultra-low frequency isolators are prone to large displacements in impact environments, and even the isolators are damaged due to large displacements, Chinese patent CN113074204B discloses an ultra-low frequency isolator that has ultra-low frequency characteristics of vibration isolation, can quickly absorb impact energy in impact environments, effectively prevent large displacements, and has higher vibration isolation safety performance. However, the device has a significant effect on ultra-low frequency vibrations, but will destroy the impact signal of grains on the outer shell of the de-separation device when the de-separation device is in a blocking load state, resulting in inaccurate early warning, and is not suitable for the de-separation device blocking load state early warning process.

[0008] Chinese patent CN115325087B aims at suppressing the transmission of vibration of power equipment to the hull by passive vibration isolation, and discloses a ship power transmission system based on double-layer active and passive vibration isolators to solve the problem of weak attenuation of low-frequency line spectrum vibration. The system can effectively attenuate the transmission of vibration of the main engine and transmission system to the hull, but the device structure is complex, and active vibration isolation will destroy the signal of the blocking load state, which is not suitable for the particularity of the separation device signal only for the isolation of interference vibration. Summary of the invention

[0009] In view of the problem that the existing acceleration sensors directly used for signal collection of the de-separating devices of harvesting machinery are interfered with by low-frequency vibrations of other components or resonance of the de-separating devices, the signals of the de-separating devices themselves are interfered with by the low-frequency vibrations of other components or resonance of the de-separating devices, the present invention provides a vibration isolation device and a threshing device for early warning of a blockage state of the de-separating devices. The interference of low-frequency vibrations on the monitoring signals of the acceleration sensors can be reduced by means of a rubber-damping plate combined bottom plate and a diamond variable damping structure. The low-frequency vibrations here refer to low-frequency vibrations generated by vibration sources including but not limited to engines, cutting tables, and transport mechanisms.

[0010] The present invention achieves the above technical objectives through the following technical means:

[0011] A vibration isolation device for warning of a jamming state of a separation device comprises an acceleration sensor, a rubber-damping plate combination bottom plate, a rhombus variable damping structure and a fixed magnet. A plurality of rhombus variable damping structures are arranged between two rubber-damping plate combination bottom plates, the acceleration sensor is located above one rubber-damping plate combination bottom plate; and a fixed magnet is installed below the other rubber-damping plate combination bottom plate.

[0012] Furthermore, the diamond variable damping structure includes a diamond four-bar mechanism and elastic damping; the four rods constitute a diamond four-bar mechanism, and the two diagonals of the diamond four-bar mechanism are respectively hinged to the first slider and the first guide rail; the first slider is movably mounted on the first guide rail, the first slider is connected to a rubber-damping plate combination bottom plate, and the first guide rail is connected to another rubber-damping plate combination bottom plate; the other two diagonals of the diamond four-bar mechanism are respectively connected to the first slider through elastic damping; the bottom of the diamond four-bar mechanism is hinged to the second slider through a support rod; the second slider is movably mounted on the second guide rail, and the second guide rail is mounted on one of the rubber-damping plate combination bottom plates.

[0013] Furthermore, one end of the rod connected to the support rod is hinged to the first guide rail, and the other end is connected to the elastic damper.

[0014] Furthermore, the first slider is moved on the first guide rail by an external force, thereby changing the distance between the two rubber-damping plate combined bottom plates; the direction in which the elastic damping generates damping is perpendicular to the direction in which the first slider moves.

[0015] Furthermore, the rubber-damping plate combined bottom plate includes a vibration-damping pad and a damping steel plate; the vibration-damping pad is located on one surface of the damping steel plate, and a plurality of diamond-shaped variable damping structures are provided between the damping steel plates of the two rubber-damping plate combined bottom plates.

[0016] Furthermore, the material of the vibration damping pad is polyurethane; and a layer of vibration damping material is provided inside the damping steel plate.

[0017] Furthermore, the vibration isolation device is in the shape of an equilateral triangular prism.

[0018] A separation device, the shell of which is equipped with the vibration isolation device for warning of a blocking state of the separation device, the acceleration sensor is used to input a vibration signal into a warning unit, and the warning unit determines whether a warning is needed based on the vibration signal.

[0019] The beneficial effects of the present invention are:

[0020] 1. The vibration isolation device and the separation device for warning of the blockage state of the separation device described in the present invention can reduce the interference of low-frequency vibration on the monitoring signal of the acceleration sensor through the rubber-damping plate combined bottom plate and the diamond variable damping structure. The low-frequency vibration here refers to the low-frequency vibration generated by vibration sources including but not limited to the engine, the cutting platform, the transportation mechanism, etc.

[0021] 2. The vibration isolation device and the separation device for warning of the blockage state of the separation device described in the present invention, the diamond variable damping structure includes a diamond four-bar mechanism and elastic damping, which can prevent the vibration acceleration sensor from being subjected to large-scale impacts, reduce the fatigue of the sensor in an extreme vibration environment for a long time, and help maintain the measurement accuracy.

[0022] 3. The vibration isolation device and the decoupling device for warning of the blockage state of the decoupling device described in the present invention solve the problem that the vibration amplitude of the decoupling device itself is large, resulting in complex signal components and more noise components received by the sensor, through the rubber-damping plate combined bottom plate and the diamond variable damping structure, so that the monitoring signal can more clearly and stably reflect the actual load state of the decoupling device, which helps to accurately judge the load state of the decoupling device.

[0023] 4. The decoupling device described in the present invention processes the vibration signal in real time through the collection, storage and processing units, and provides the operator with load status warning information through the warning device, thereby preventing the decoupling device from being blocked and avoiding the risk of blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a three-dimensional diagram of the vibration isolation device for early warning of a blockage state of a separation device according to the present invention.

[0026] Figure 2 This is a three-dimensional diagram of the rubber-damping plate combined bottom plate described in the present invention.

[0027] Figure 3 This is the front view of the diamond-shaped variable damping structure described in the present invention.

[0028] Figure 4 This is a three-dimensional diagram of the second slider described in the present invention.

[0029] Figure 5 The present invention is a schematic diagram of the installation position of the vibration isolation device on the threshing device.

[0030] Figure 6 The present invention is a flow chart of the de-separation device.

[0031] In the figure:

[0032] 1-acceleration sensor; 2-rubber-damping plate combined bottom plate; 2-1-vibration damping pad; 2-2-damping steel plate; 3-diamond variable damping structure; 3-1-rod; 3-2-spring; 3-3-first slider; 3-4-first guide rail; 3-5-support rod; 3-6-second slider; 3-7-second guide rail; 4-fixed magnet. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 As shown, the vibration isolation device for warning the blocking state of the separation device described in the present invention includes an acceleration sensor 1, a rubber-damping plate combined bottom plate 2, a rhombus variable damping structure 3 and a fixed magnet 4. The vibration isolation device is a triangular prism as a whole, and a plurality of rhombus variable damping structures 3 are arranged between two rubber-damping plate combined bottom plates 2. The acceleration sensor 1 is located above one rubber-damping plate combined bottom plate 2; a fixed magnet 4 is installed under the other rubber-damping plate combined bottom plate 2, and the fixed magnet 4 is convenient for the adsorption and installation of the vibration isolation device. In the embodiment, the rubber-damping plate combined bottom plate 2 is an equilateral triangle, and three rhombus variable damping structures 3 are respectively installed on the three sides of the two rubber-damping plate combined bottom plates 2. The rhombus variable damping structure can reduce the influence of lateral vibration. Through the rubber-damping plate combined bottom plate and the rhombus variable damping structure, the interference of low-frequency vibration and lateral vibration on the acceleration sensor monitoring signal can be reduced. The low-frequency vibration here refers to the low-frequency vibration generated by vibration sources including but not limited to engines, headers, and transportation mechanisms.

[0037] like Figure 3 and Figure 4 As shown, the diamond variable damping structure 3 includes a diamond four-bar mechanism and elastic damping; the four rods 3-1 constitute a diamond four-bar mechanism, and the two diagonals of the diamond four-bar mechanism are respectively hinged to the first slider 3-3 and the first guide rail 3-4; the first slider 3-3 is movably mounted on the first guide rail 3-4, the first slider 3-3 is connected to a rubber-damping plate combination bottom plate 2, and the first guide rail 3-4 is connected to another rubber-damping plate combination bottom plate 2; the other two diagonals of the diamond four-bar mechanism are respectively connected to the first slider 3-3 through elastic damping; the bottom of the diamond four-bar mechanism is hinged to the second slider 3-6 through a support rod 3-5; the second slider 3-6 is movably mounted on the second guide rail 3-7, and the second guide rail 3-7 is mounted on one of the rubber-damping plate combination bottom plates 2.

[0038] For the convenience of description, the four rods 3-1 constitute a diamond four-bar mechanism which is recorded as diamond ABCD, wherein A and C are the vertices of one diagonal line, and B and D are the vertices of another diagonal line; the four rods 3-1 are recorded as rod AB, rod BC, rod CD and rod AD respectively; the intersection of rod AB, rod BC, rod CD and rod AD is the hinge point, the A hinge point is located on the first slider 3-3, the C hinge point is located on the first guide rail 3-4, and the first slider 3-3 can slide along the first guide rail 3-4. The B hinge point and the D hinge point are connected to the first slider 3-3 through springs 3-2 respectively; the support rod 3-5 is connected to the midpoint of the rod BC and the midpoint of the rod CD respectively, and the other end of the support rod 3-5 is hinged to the second slider 3-6, and the second slider 3-6 can be movably installed on the second guide rail 3-7. The first slider 3-3 is moved on the first guide rail 3-4 by an external force, thereby changing the distance between the two rubber-damping plate combination bottom plates 2. In addition, the direction in which the spring 3-2 generates damping is perpendicular to the direction in which the first slider 3-3 moves. Figure 3 As shown, the first slider 3-3 moves in the y direction, and the spring 3-2 generates damping in the x direction, which is the direction of lateral vibration. To prevent unnecessary displacement during structural deformation, deep groove ball bearings are provided at the four intersections of the diamond four-bar mechanism.

[0039] like Figure 2 As shown, the rubber-damping plate combined bottom plate 2 includes a vibration-damping pad 2-1 and a damping steel plate 2-2; the vibration-damping pad 2-1 is located on one surface of the damping steel plate 2-2, and a plurality of rhombus variable damping structures 3 are provided between the damping steel plates 2-2 of the two rubber-damping plate combined bottom plates 2. The material of the vibration-damping pad 2-1 is polyurethane, which has good elasticity and compressibility, and can absorb part of the vibration energy, and has a thickness of 10mm; a sandwich layer of vibration-damping material is provided in the damping steel plate 2-2. In the embodiment, the damping steel plate 2-2 is an aluminum alloy plate with a sandwich layer of polymer-based material, and the polymer is also a vibration-damping material, which can be rubber or polyurethane, and can reduce the small amplitude of vibration during resonance through energy dissipation. The thickness of the damping steel plate 2-2 is 8mm. In addition to the equilateral triangle embodiment mentioned in the text, the rubber-damping plate combined bottom plate 2 also includes but is not limited to the following shapes: arc shape, polygonal shape, etc. The interlayer material in the vibration-damping pad 2-1 and the damping steel plate 2-2 can be selected according to the specific harvesting working conditions. Suitable materials can be selected for vibration isolation.

[0040] like Figure 5As shown, a de-separating device, the shell of which is installed with the vibration isolation device for warning of the de-separating device tending to block the state, the acceleration sensor 1 is used to input the vibration signal into the warning unit, and the warning unit determines whether a warning is needed according to the vibration signal. The fixed magnet 4 is used to be adsorbed on the outer shell of the de-separating device of the combine harvester, which is easy to install, and the position of the monitoring point can be changed at any time, and the monitoring signal is effectively prevented from being inaccurate due to the displacement of the monitoring point position caused by the severe vibration during the operation of the combine harvester.

[0041] The vibration isolation device is designed based on the vibration sources of the combine harvester under typical working conditions, specifically: 1) idling condition, the engine is idling after starting, not moving, and the vibration source is the engine; 2) high-speed standby, the engine runs to the maximum speed, and the other parts are not working, and the vibration source is the engine; 3) threshing idling, the clutch is closed, the working parts are running but not moving, and the vibration source is the superposition of the engine, threshing mechanism, cleaning mechanism and transportation system; 4) moving condition, the engine is at high speed, all working parts are running and walking on a crop-free open space, and the harvesting table is not fed, and the vibration source is the superposition of the engine, threshing mechanism, and cleaning mechanism signals; 5) operating condition, the engine is at high speed, the harvesting operation is at normal speed, and the harvesting table is fed, and the vibration source is the superposition of the engine, threshing mechanism, and cleaning mechanism. The different feed amounts change the load of the threshing system, which in turn affects the vibration signal.

[0042] Relevant research shows that the lateral vibration of the threshing drum, the reciprocating motion of the vibrating screen, the up and down swinging of the connection between the conveyor trough and the threshing frame, and the up and down vibration of the engine are the main vibration sources of the combine harvester. In addition, there is also vibration excitation of the whole machine by the road surface, and the excitation frequencies of various vibration sources on the combine harvester are concentrated in the two intervals of 20-25Hz and 45-50Hz, which are low-frequency vibrations.

[0043] Working principle:

[0044] The vibration isolation device in this embodiment includes a rubber material, which is elastic in itself and can undergo elastic deformation when subjected to low-frequency vibration excitation. This deformation absorbs vibration energy and dissipates it by converting it into other forms of energy such as heat energy inside the rubber. At the same time, the presence of the damping plate further enhances the effect of energy dissipation. This suppresses the interference of low-frequency vibration on the signal of the separation device. The elastic properties of the spring in the diamond variable damping structure can change the natural frequency of the vibration system, keeping it away from the excitation frequency of the low-frequency vibration, thereby avoiding the occurrence of resonance, reducing the transmission of vibration, and achieving the purpose of vibration isolation. The rod member plays a role in supporting and guiding the deformation direction of the spring, ensuring that the spring performs telescopic movement within a reasonable range. The diamond structure has nonlinear stiffness and nonlinear damping. Compared with traditional linear vibration isolators, it has lower peak frequency and response, wider frequency band, and the damping generated by the mutual friction between the rods and the air friction can dissipate energy, reduce the low-frequency vibration of each vibration source and the low-frequency vibration generated by the de-separation device itself during operation, so that the interference signal in the signal collected by the sensor is weakened, and the impact signal of crops such as rice and wheat on the outer shell of the de-separation device is highlighted, thereby making the load state warning of the de-separation device tending to blockage more accurate.

[0045] This embodiment also provides a threshing blocking state early warning method based on the above-mentioned vibration isolation device, such as Figure 6 As shown:

[0046] 1) Install the vibration isolation device on the outer surface of the separation device, and place the acceleration sensor above the vibration isolation device.

[0047] 2) After the machine is started, the original vibration signal passes through the vibration isolation device, which reduces the interference of the low-frequency vibration generated by the vibration sources including the engine, cutting platform, and transportation mechanism, as well as the resonance signal caused by it, so that the main component of the signal after vibration isolation only contains the state signal characteristics of the separation system during operation.

[0048] 3) After vibration isolation, the vibration signal passes through the signal acquisition and storage module in the acquisition and storage device, is classified and stored, and finally enters the early warning device through the analysis and processing module.

[0049] 4) When a traffic jam signal is detected, the warning device generates a warning message.

[0050] The above is the basic principle and working process of the vibration signal isolation device and method for threshing load blocking warning.

[0051] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vibration isolation device for early warning of a blocking state of a separation device, characterized in that: The device comprises an acceleration sensor (1), a rubber-damping plate combined bottom plate (2), a rhombus variable damping structure (3) and a fixed magnet (4). A plurality of rhombus variable damping structures (3) are arranged between two rubber-damping plate combination bottom plates (2); the acceleration sensor (1) is located above one rubber-damping plate combination bottom plate (2); and a fixed magnet (4) is installed below the other rubber-damping plate combination bottom plate (2).

2. The vibration isolation device for early warning of the blocking state of the separation device according to claim 1 is characterized in that: The diamond variable damping structure (3) comprises a diamond four-bar mechanism and elastic damping; the four rods (3-1) constitute the diamond four-bar mechanism, and the two diagonal portions of the diamond four-bar mechanism are respectively hinged to the first slider (3-3) and the first guide rail (3-4); the first slider (3-3) is movably mounted on the first guide rail (3-4), the first slider (3-3) is connected to a rubber-damping plate combination bottom plate (2), and the first guide rail (3-4) is connected to another rubber-damping plate combination bottom plate (2); the other two diagonal portions of the diamond four-bar mechanism are respectively connected to the first slider (3-3) through elastic damping; the bottom of the diamond four-bar mechanism is hinged to the second slider (3-6) through a support rod (3-5); the second slider (3-6) is movably mounted on the second guide rail (3-7), and the second guide rail (3-7) is mounted on one of the rubber-damping plate combination bottom plates (2).

3. The vibration isolation device for early warning of the blocking state of the separation device according to claim 2 is characterized in that: A rod member (3-1) connected to the support rod (3-5) has one end hinged to the first guide rail (3-4) and the other end connected to the elastic damper.

4. The vibration isolation device for warning of the blocking state of the separation device according to claim 4 is characterized in that: The first slider (3-3) is moved on the first guide rail (3-4) by external force, thereby changing the distance between the two rubber-damping plate combined bottom plates (2); the direction in which the elastic damping generates damping is perpendicular to the direction in which the first slider (3-3) moves.

5. The vibration isolation device for warning of the blocking state of the separation device according to claim 1 is characterized in that: The rubber-damping plate combined bottom plate (2) comprises a vibration-damping pad (2-1) and a damping steel plate (2-2); the vibration-damping pad (2-1) is located on one surface of the damping steel plate (2-2), and a plurality of rhombus-shaped variable damping structures (3) are provided between the damping steel plates (2-2) of the two rubber-damping plate combined bottom plates (2).

6. The vibration isolation device for early warning of the blocking state of the separation device according to claim 5 is characterized in that: The material of the vibration-damping pad (2-1) is polyurethane; and a sandwich layer of vibration-damping material is provided inside the damping steel plate (2-2).

7. The vibration isolation device for early warning of the blocking state of the separation device according to claim 1 is characterized in that: The vibration isolation device is in the shape of an equilateral triangular prism.

8. A threshing device, characterized in that: The shell is installed with a vibration isolation device for warning of a blockage state of the separation device as described in any one of claims 1 to 6, and the acceleration sensor (1) is used to input a vibration signal into a warning unit, and the warning unit determines whether a warning is needed based on the vibration signal.

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