Suction structure of thresher for multiple crops and thresher for multiple crops

Abstract

The utility model belongs to the technical field of threshers, discloses a suction structure of a thresher for multiple crops and the thresher for the multiple crops, and aims to solve the problems that the rotating speed of an exhaust fan cannot be adjusted due to coaxial rotation of the exhaust fan and an auger shaft, and the separation effect of grain particles and sundries is poor due to insufficient suction force. The suction structure comprises an exhaust fan used for providing suction force for the grain outlet cylinder, a rotating shaft of the exhaust fan is provided with a speed change mechanism in a matched mode, the speed change mechanism is connected with an auger shaft of the thresher for the multiple crops in a rotating mode, and the speed change mechanism enables the rotating speed of the rotating shaft of the exhaust fan to be larger than or equal to the rotating speed of the auger shaft. According to the utility model, the speed change mechanism is arranged on the exhaust fan, so that the suction force of the exhaust fan can be adjusted through the speed change mechanism on the premise of not changing the internal structure of the exhaust fan and not changing the rotating speed of the auger shaft, and the negative pressure airflow applied to the grain outlet cylinder is stronger, thereby improving the separation effect between grain grains and impurities.

Description

Technical Field

[0001] The utility model belongs to the technical field of threshers, and particularly relates to a suction structure of a thresher for multiple crops and the thresher for multiple crops. Background Art

[0002] With the widespread use of threshers, most crops such as wheat, rice, rapeseed, highland barley, sorghum, coix seed, mung bean, and soybean are threshed using single-function threshers. This requires users to purchase threshers for different crops, such as rice and wheat threshers for rice and wheat, and rapeseed threshers for rapeseed. This not only leads to higher equipment costs, but also different operating methods for different threshers, greatly increasing the user's operational difficulty.

[0003] In response to the above situation, multi-crop threshers have appeared in the prior art. For example, patent application number 2021107242444 discloses a multi-crop thresher with coaxial multi-drum flippable threshing teeth, patent application number 201520360373X discloses a wheat threshing and corn stalk cutter, patent application number 2022215950793 discloses an adaptive multi-crop high-efficiency threshing device for a combine harvester, and patent application number 2023230361944 filed by the present applicant on November 10, 2023 discloses a multi-crop threshing tooth bar, threshing drum and thresher, etc. The above prior arts can all achieve threshing of different crops.

[0004] At present, the thresher (separation device) described above is basically equipped with an exhaust fan, which is used to suck out foreign matter (such as dust, small straw, etc.) mixed in the threshed grains to improve the cleanliness of the grain particles. Specifically, the blades of the exhaust fan are directly mounted on the auger shaft of the thresher (the auger shaft is arranged below the filter screen and is used to transport the grain particles and foreign matter to the grain discharge barrel together). The suction force generated by the exhaust fan blades is connected to the top of the grain discharge barrel through the air duct. The relatively light foreign matter (such as dust, small straw, etc.) is sucked away and discharged by the suction force in the air duct, while the relatively heavy grain particles are discharged from the bottom of the grain discharge barrel under the action of gravity, thereby achieving the separation of grain particles and foreign matter.

[0005] In practice, farmers often use threshers too quickly to increase threshing speed, resulting in unsatisfactory separation of grain particles from debris. However, this problem remains unresolved. Furthermore, multi-crop threshers require replacement filter screens when threshing different crops (i.e., the mesh sizes of the filter screens differ depending on the crop). For example, when threshing rapeseed, the mesh size of the filter screen is smaller, while when threshing soybeans and broad beans, the mesh size of the filter screen is larger. As the mesh size of the filter screen increases, more straw debris (such as damaged straw, branches, leaves, and husks) enters the auger chamber. Consequently, more straw debris mixes with the grain particles in the auger chamber, leading to a higher amount of straw debris entering the grain discharge barrel. Excessive straw debris not only leads to poor grain separation but also easily causes jamming (i.e., straw debris blocks the grain discharge port below the grain discharge barrel, preventing grain particles from being discharged smoothly from the bottom of the barrel).

[0006] Since the shaft of the exhaust fan rotates coaxially with the auger shaft, when the speed of the auger shaft is constant, the speed of the shaft of the exhaust fan cannot be increased, so the suction force of the exhaust fan cannot be increased to solve the problems of poor grain particle separation and easy jamming of the grain discharge barrel.

[0007] Since the blades of the exhaust fan are directly mounted on the auger shaft, although the suction force generated by the exhaust fan blades can be increased by increasing the rotation speed of the auger shaft, excessively high rotation speed of the auger shaft will squeeze and crush the grain particles. Utility Model Content

[0008] In order to solve the problem that the exhaust fan and the auger shaft rotate coaxially, which makes it impossible to adjust the rotation speed of the exhaust fan, and thus the separation effect of grain particles and debris is poor due to insufficient suction force, the utility model provides a suction structure of a multi-crop thresher and a multi-crop thresher. Without adding a drive motor (or gasoline engine, diesel engine), the rotation speed of the exhaust fan can be adjusted so as to provide the grain discharge barrel with a suction force suitable for the threshing operation of different crops, thereby improving the separation effect of grain particles and debris.

[0009] In order to solve the technical problem, the technical solution adopted by the utility model is:

[0010] A suction structure of a multi-crop thresher includes an exhaust fan for providing suction force (i.e., negative pressure) to a grain discharge barrel. The invention is characterized in that the rotating shaft of the exhaust fan is equipped with a speed changing mechanism, and the speed changing mechanism is rotatably connected to the auger shaft of the multi-crop thresher. The speed changing mechanism makes the rotating shaft of the exhaust fan have a rotation speed greater than or equal to the rotation speed of the auger shaft.

[0011] In some embodiments, the speed change mechanism includes a driving wheel mounted on the auger shaft and a driven wheel mounted on the rotating shaft of the exhaust fan, and the transmission ratio between the driving wheel and the driven wheel is less than 1.

[0012] In some embodiments, the speed change mechanism includes a driving pulley mounted on the auger shaft and a driven pulley mounted on the rotating shaft of the exhaust fan, the number of the driving pulleys is at least 2, the number of the driven pulleys is the same as the number of the driving pulleys, and the transmission ratio between any one of the at least two driving pulleys and any one of the driven pulleys is less than or equal to 1.

[0013] As a preferred embodiment of the present invention, the number of the driving pulley and the number of the driven pulley are both 2, the transmission ratio between one driving pulley and one driven pulley is 1, and the transmission ratio between the other driving pulley and the other driven pulley is less than 1.

[0014] In some embodiments, the speed change mechanism includes a driving pulley mounted on the auger shaft and at least two driven pulleys mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and / or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between the driving pulley and any one of the at least two driven pulleys is less than or equal to 1.

[0015] In some embodiments, the speed change mechanism includes at least two driving pulleys mounted on the auger shaft and one driven pulley mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and / or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between any one of the at least two driving pulleys and the driven pulley is less than or equal to 1.

[0016] In some embodiments, the driving pulley is installed on the auger shaft by means of a tapered sleeve and screws, and the driving pulley is installed at different positions on the auger shaft to thereby achieve adjustment of the axial position of the driving pulley on the auger shaft; the driven pulley is installed on the rotating shaft of the exhaust fan by means of a tapered sleeve and screws, and the driven pulley is installed at different positions on the rotating shaft of the exhaust fan to thereby achieve adjustment of the axial position of the driven pulley on the rotating shaft of the exhaust fan.

[0017] In some embodiments, the driving pulley is provided with a plurality of threaded holes along the radial direction, the auger shaft is provided with a plurality of threaded holes along the axial direction of the auger shaft, the threaded holes are equipped with a fastening screw, the driving pulley and the auger shaft are connected by a fastening screw, the threaded holes on the driving pulley cooperate with the threaded holes at different positions on the auger shaft to realize the axial position adjustment of the driving pulley on the auger shaft; the driven pulley is provided with a plurality of threaded holes along the radial direction, the exhaust fan's rotating shaft is provided with a plurality of threaded holes along the axial direction of the rotating shaft, the threaded holes are equipped with a fastening screw, the driven pulley is connected to the exhaust fan's rotating shaft by a fastening screw, the threaded holes on the driven pulley cooperate with the threaded holes at different positions on the exhaust fan's rotating shaft to realize the axial position adjustment of the driven pulley on the exhaust fan's rotating shaft.

[0018] In some embodiments, the driving pulley is provided with at least one through keyway, the auger shaft is provided with keyways of the same number as the keyways on the driving pulley, and radial positioning is achieved between the driving pulley and the auger shaft by cooperation of the keyway and the key; the driving pulley is provided with a threaded hole along the radial direction, and the auger shaft is provided with a plurality of threaded holes along the axial direction of the auger shaft, and the threaded hole is equipped with a fastening screw, and the fastening screw passes through the threaded hole on the driving pulley and extends into the threaded hole on the auger shaft to achieve axial positioning; the threaded hole on the driving pulley cooperates with the threaded holes at different positions on the auger shaft to achieve adjustment of the axial position of the driving pulley on the auger shaft; The driven pulley is provided with at least one through keyway, and the exhaust fan's rotating shaft is provided with keyways with the same number as the keyways on the driven pulley, and radial positioning between the driven pulley and the rotating shaft of the exhaust fan is achieved by the cooperation of the keyway and the key; the driven pulley is provided with a threaded hole along the radial direction, and the rotating shaft of the exhaust fan is provided with multiple threaded holes along the axial direction of the rotating shaft, and the threaded hole is equipped with a fastening screw, and the fastening screw passes through the threaded hole on the driven pulley and extends into the threaded hole on the rotating shaft of the exhaust fan to achieve axial positioning; the threaded hole on the driven pulley cooperates with the threaded holes at different positions on the rotating shaft of the exhaust fan to achieve adjustment of the axial position of the driven pulley on the rotating shaft of the exhaust fan.

[0019] In some embodiments, the speed change mechanism further comprises a tensioning pulley for adjusting the belt tension; the tensioning pulley can be adjusted in height vertically, and / or the tensioning pulley can be adjusted in horizontal direction so as to facilitate alignment of the tensioning pulley with the driving pulley and the driven pulley.

[0020] In some embodiments, the body of the multi-crop thresher has or is equipped with a mounting portion, the mounting portion is provided with a plurality of vertically arranged through holes or the mounting portion is provided with vertically arranged strip holes, the mounting shaft of the tensioning wheel is provided with a screw, the screw is provided with a locking nut, the screw passes through the through hole or the strip hole and is locked on the mounting portion by the provided locking nut.

[0021] Based on the above suction structure of the thresher for multiple crops, the utility model also provides a thresher for multiple crops, including a machine body and a grain discharge barrel, an auger shaft is arranged below the filter screen in the machine body, and the suction structure of the thresher for multiple crops mentioned above is also installed on the machine body.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The utility model equips the exhaust fan with a speed change mechanism. Under the premise of not changing the internal structure of the exhaust fan and not changing the rotation speed of the auger shaft, the suction force of the exhaust fan can be adjusted through the speed change mechanism, thereby applying a stronger negative pressure airflow to the grain discharge barrel, thereby improving the separation effect between grain particles and debris. At the same time, the stronger suction force of the exhaust fan can be used to more quickly suck away straw debris in the grain discharge barrel, avoiding the situation of stagnation and blockage in the grain discharge barrel.

[0024] The utility model can adopt a lower-cost speed change mechanism on the basis of the original multi-crop thresher structure to change the rotation speed of the rotating shaft of the exhaust fan, thereby improving the separation effect between grain particles and debris.

[0025] The speed change mechanism of the present invention has two driving pulleys and two driven pulleys. The transmission ratio between one driving pulley and one driven pulley is 1, while the transmission ratio between the other driving pulley and the other driven pulley is less than 1. In actual use, the speed of the exhaust fan's rotating shaft can be changed by simply adjusting the position of the belt (i.e., rotatably connecting the driving pulley to different driven pulleys). This makes adjustment easy and simple to operate. Ordinary farmers can manually adjust the speed before threshing different crops, thereby ensuring the separation of grain particles from debris (primarily broken straw, husks, etc.) in the grain discharge barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of an existing multi-crop thresher;

[0027] Figure 2 This is a schematic structural diagram of an embodiment of a suction structure of a multi-crop thresher according to the present invention. In this diagram, a driving wheel and a driven wheel of the speed change mechanism are both pulleys.

[0028] Figure 3 This is a schematic structural diagram of another embodiment of the suction structure of the multi-crop thresher of the present invention. In this schematic diagram, the speed change mechanism has two driving pulleys and two driven pulleys;

[0029] Figure 4 This is a schematic structural diagram of another embodiment of the suction structure of the multi-crop thresher of the present invention. In this schematic diagram, the speed change mechanism has one driving pulley and two driven pulleys.

[0030] Figure 5 This is a schematic structural diagram of another embodiment of the suction structure of the multi-crop thresher of the present invention. In this schematic diagram, the speed change mechanism has two driving pulleys and one driven pulley;

[0031] Figure 6 This is a schematic structural diagram of an embodiment of the speed change mechanism of the present invention including a tensioning pulley, in which the transmission ratio between the driving pulley and the driven pulley is 1;

[0032] Figure 7 This is a schematic structural diagram of an embodiment of the speed change mechanism of the present invention including a tensioning pulley, in which the transmission ratio between the driving pulley and the driven pulley is less than 1;

[0033] Figure 8 Schematic diagram of the structure of an embodiment in which a tensioning wheel is mounted on a mounting portion, including 8a and 8b. The screw rods of the tensioning wheels in 8a and 8b are positioned at different heights on the mounting portion, and the horizontal distances by which the tensioning wheel extends from the mounting portion are also different.

[0034] Figure 9 A schematic structural diagram of an embodiment in which a driving pulley is installed on the auger shaft or a driven pulley is installed on the rotating shaft of an exhaust fan;

[0035] Figure 10 A schematic structural diagram of an embodiment in which a driving pulley is mounted on an auger shaft via a key and a fastening screw, or a driven pulley is mounted on a rotating shaft of an exhaust fan via a key and a fastening screw;

[0036] Figure 11 The utility model is a schematic structural diagram of a multi-crop thresher according to an embodiment of the present invention.

[0037] Markings in the figure: 01, machine body, 02, feed hopper, 03, slag outlet, 04, particle outlet, 05, exhaust fan, 051, impurity outlet, 052, rotating shaft, 06, air duct, 07, auger bin, 08, auger shaft, 081, spiral blade, 082, lifting plate, 1, speed change mechanism, 11, driving pulley, 12, driven pulley, 13, belt, 14, tensioning pulley, 141, mounting shaft, 142, screw, 143, locking screw, 144, locking nut, 2, mounting part, 21, through hole, 3, threaded hole, 4, fastening screw, 5, keyway, 6, key. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with embodiments. The embodiments described are only a portion of the embodiments of the present invention and are not intended to be all embodiments. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without creative work are all within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0040] Combined with attachment Figure 1This is a commonly used multi-crop thresher on the market. It mainly includes a body 01, which is provided with a threshing chamber connected to a feed hopper 02. Below the threshing chamber is an auger bin (or discharge bin) 07. An auger shaft 08 is provided in the auger bin 07. The auger bin 07 is located below the filter screen of the threshing chamber, thereby collecting the threshed grain particles and broken straw debris (straw, branches, leaves, shells, etc. that can pass through the filter screen). When the auger shaft 08 in the auger bin 07 rotates, the spiral blades 081 on the auger shaft 08 drive the grain particles and straw debris (straw, branches, leaves, shells, etc. that can pass through the filter screen) toward the grain discharge barrel (also commonly known as the air separation barrel or discharge barrel) 04. The auger shaft 08 is also provided with a lifting plate 082. During the rotation of the lifting plate 082, the grain particles and straw debris are thrown into the grain discharge barrel 04. At the same time, the exhaust fan 05, which is coaxially driven by the auger shaft 08, generates negative pressure and transmits the negative pressure (suction force) to the top of the grain discharge barrel 04 through the air duct 06. When the grain particles and straw debris (which can pass through the filter screen) enter the grain discharge barrel 04, the heavier grain particles are discharged from the bottom of the grain discharge barrel 04, while the relatively lighter straw debris is sucked away through the air duct 04 and finally discharged from the exhaust outlet 051 of the exhaust fan 05. The exhaust fan is then used to separate the straw debris in the grain discharge barrel 04. The relatively large straw that cannot pass through the filter screen is discharged from the slag outlet 03.

[0041] In the prior art, the shaft of the exhaust fan attached to the grain discharge drum rotates coaxially with the auger shaft of the multi-crop thresher, resulting in a rotational speed that is consistent with the auger shaft. Without altering the exhaust fan's internal structure, the suction force (negative pressure) applied by exhaust fan 05 to grain discharge drum 04 cannot be changed. Therefore, when threshing different crops, the same suction force applied by the exhaust fan to the grain discharge drum results in less than satisfactory separation of grain particles from debris within the grain discharge drum. For example, when the auger shaft 08 rotates at 4 rpm, the shaft of exhaust fan 05 also rotates at 4 rpm. The suction force (negative pressure) applied by exhaust fan 05 to grain discharge drum 04 can effectively separate wheat and rapeseed particles from debris. However, when the rotation speed of the auger shaft 08 and the exhaust fan 05 is still A r / min, the suction force (negative pressure) applied by the exhaust fan to the particle barrel 04 cannot meet the separation effect of soybean particles and debris, that is, the separation effect of soybean particles and debris (broken soybean shells, etc.) is poor and cannot meet the expected effect of farmers.

[0042] In the prior art, for example, the patent application number 2016208493980 discloses a multifunctional single-ear rice thresher, in which the rotating shaft of the exhaust fan of the thresher is directly connected to the motor shaft. The speed of the motor is generally kept stable during threshing operation, so that the exhaust fan provides a certain suction force (negative pressure) to the grain discharge cylinder (airflow separation grain discharge cylinder). When threshing other crops (such as soybeans and broad beans), there will be a problem of poor separation effect between the grain particles and debris in the grain discharge cylinder. If the speed of the motor is increased, the speed of the threshing drum in the threshing chamber and the rotating skewer (i.e., the auger shaft) in the discharge chamber will increase accordingly, which will cause the grain particles to be squeezed and damaged by impact at high speeds.

[0043] For example, the patent application number 2015201772184 discloses an easy-to-separate, efficient and multifunctional thresher. The exhaust fan of the thresher is directly connected to the threshing roller. The rotation speed of the threshing roller is generally kept stable during threshing operation, so that the exhaust fan provides a certain suction force (negative pressure) to the grain outlet cylinder (airflow separation grain outlet cylinder). When threshing other crops (such as soybeans and broad beans), there will be a problem of poor separation effect between the grain particles and debris in the grain outlet cylinder. If the rotation speed of the threshing roller is increased, the grain particles will be squeezed and damaged by impact at high rotation speed.

[0044] For example, the patent application number 2023230361944 submitted by the applicant on November 10, 2023 discloses a threshing tooth rod, threshing drum and thresher for multiple crops. The rotating shaft of the exhaust fan of the thresher is also directly connected to the auger shaft.

[0045] For example, patent application number 202107242444 discloses a multi-crop thresher with coaxial multi-drum reversible threshing teeth. The suction and air separation mechanism of the thresher includes a suction fan and a separation and cleaning barrel. The suction and air separation mechanism also includes an auger and a grain lifter. The threshed grain particles are spirally transported by the auger into the grain lifter. From the drawings of the patent, those skilled in the art can know that the suction fan is also directly connected to the auger (i.e., the auger shaft).

[0046] For example, patent application number 2022302098419 discloses a multi-crop thresher. Those skilled in the art can also know from its appearance picture that the suction fan is also directly connected to the auger shaft.

[0047] In summary, in the prior art thresher, no matter the rotating shaft of the exhaust fan is connected to the auger shaft, or the rotating shaft of the exhaust fan is connected to the threshing roller shaft and the motor, the speed of the exhaust fan cannot be adjusted and the speed of the exhaust fan cannot be changed.

[0048] Combined with attachment Figure 2 To the attached Figure 10The suction structure of the multi-crop thresher of the present invention includes an exhaust fan 05 for providing suction force (i.e., negative pressure) to the grain discharge barrel 04. The rotating shaft 052 of the exhaust fan 05 is equipped with a speed change mechanism 1. The speed change mechanism 1 is rotatably connected to the auger shaft 08 of the multi-crop thresher. The speed change mechanism 1 makes the rotation speed of the rotating shaft 052 of the exhaust fan 05 greater than or equal to the rotation speed of the auger shaft 08.

[0049] By equipping the exhaust fan 05 with a speed change mechanism 1, the utility model can adjust the suction force of the exhaust fan 05 through the speed change mechanism 1 without changing the internal structure of the exhaust fan 05 or the rotational speed of the auger shaft 08, thereby applying a stronger negative pressure airflow to the grain discharge barrel 04, thereby improving the separation effect between the grain particles and debris in the grain discharge barrel 04. At the same time, the stronger suction force of the exhaust fan can more quickly suck away straw and debris in the grain discharge barrel, avoiding stagnation and blockage in the grain discharge barrel.

[0050] Without changing the internal structure of the exhaust fan 05, although the suction force of the exhaust fan 05 can be increased by increasing the rotation speed of the auger shaft 08, the grains are easily damaged by the auger shaft 08 when the rotation speed of the auger shaft 08 is increased. Therefore, this method of increasing the rotation speed of the exhaust fan 05 by increasing the rotation speed of the shaft 052 is not advisable.

[0051] It is understood by those skilled in the art that the suction force of the exhaust fan is closely related to the rotation speed of the rotating shaft 052, the blade diameter, the number of impellers, etc., and that improving the blade diameter and the number of impellers is relatively more complex and costly. Therefore, the present invention improves the suction force of the exhaust fan 05 by changing the rotation speed of the rotating shaft 052 of the exhaust fan through the speed change mechanism 1, which has the advantage of low modification cost.

[0052] In summary, the present invention can adopt a lower-cost speed change mechanism based on the original multi-crop thresher structure to change the rotation speed of the exhaust fan shaft, thereby improving the separation effect between grain particles and debris.

[0053] In the specific implementation process, the utility model only needs to extend the rotating shaft of the exhaust fan of the existing multi-crop thresher and extend one end of the auger shaft out of the auger bin 07, so as to use the speed change mechanism 1 to rotate and connect the rotating shaft of the exhaust fan 05 with the auger shaft 08.

[0054] Combined with attachment Figure 2In some embodiments, the speed change mechanism 1 includes a driving wheel mounted on the auger shaft 08 and a driven wheel mounted on the exhaust fan's rotating shaft, with the transmission ratio between the driving wheel and the driven wheel being less than 1. Specifically, the rotational speed of the exhaust fan's rotating shaft 052 is directly varied by the driving wheel and the driven wheel, such that the rotational speed of the exhaust fan's rotating shaft 052 is greater than that of the auger shaft 08 of a multi-crop thresher. This allows the relatively high-speed exhaust fan to provide greater suction force, ultimately improving the separation of grain particles from debris within the grain discharge barrel.

[0055] The exhaust fan 05 is connected to the upper end of the pellet discharge barrel 04 via an air duct 06. The suction force (negative pressure) generated by the exhaust fan 05 draws debris from the pellet discharge barrel 04 into the air duct 06, and ultimately discharges the debris from the exhaust fan 05 through the debris outlet 051. The structure of the exhaust fan and the pellet discharge barrel, as well as the connection between them, are prior art products that are readily understood by those skilled in the art and will not be further elaborated here.

[0056] In some embodiments, the driving wheel and the driven wheel are both pulleys, and the driving wheel and the driven wheel are rotationally connected via a belt 13. In some embodiments, the driving wheel and the driven wheel are sprockets, and the driving wheel and the driven wheel are rotationally connected via a chain.

[0057] In some embodiments, the driving wheel and the driven wheel are both gears, and the driving wheel and the driven wheel are meshed with each other. When the distance between the driving wheel and the driven wheel is large, an odd number of transition gears are provided between the driving wheel and the driven wheel to ensure that the driving gear (i.e., the driving wheel) and the driven gear (i.e., the driven wheel) rotate in the same direction. Regardless of how the transition gears are provided, the transmission ratio between the driving wheel (i.e., the driving gear mounted on the auger shaft) and the driven wheel (i.e., the driven gear mounted on the exhaust fan's shaft) should be less than 1, so that the speed of the exhaust fan's shaft 052 can be increased while the speed of the auger shaft 08 remains unchanged.

[0058] In the specific implementation process, in order to reduce the transformation cost, belt drive (that is, both the driving pulley and the driven pulley are pulleys) is preferred.

[0059] In some embodiments, the speed change mechanism 1 includes a driving pulley 11 mounted on the auger shaft 08 and a driven pulley 12 mounted on the rotating shaft 052 of the exhaust fan 05. The number of the driving pulleys 11 is at least two, and the number of the driven pulleys 12 is the same as the number of the driving pulleys 11. The transmission ratio between any one of the at least two driving pulleys and any one of the driven pulleys is less than or equal to 1. The transmission ratio between the driving pulley and the driven pulley is less than 1, indicating that the rotational speed of the driven pulley is greater than the rotational speed of the driving pulley. The transmission ratio between the driving pulley and the driven pulley is equal to 1, indicating that the rotational speed of the driven pulley is equal to the rotational speed of the driving pulley.

[0060] When the speed of the driving pulley is equal to that of the driven pulley, the speed of the exhaust fan's shaft is the same as that of the auger shaft. When the speed of the driving pulley is lower than that of the driven pulley, the speed of the exhaust fan's shaft is higher than that of the auger shaft. This increases the exhaust fan's speed while keeping the auger shaft speed constant, thereby increasing the exhaust fan's suction force. The exhaust fan provides greater suction force (negative pressure) to the grain barrel through the air duct, ultimately improving the separation of grain particles and debris in the grain barrel.

[0061] Therefore, those skilled in the art can understand and appreciate the relationship between the transmission ratio and the rotational speed between the driving pulley and the driven pulley, and will not be elaborated on here.

[0062] In some embodiments, the inner diameters of the belt grooves of each driving pulley 11 are the same, while the inner diameters of the belt grooves of each driven pulley 12 are different, thereby utilizing different driven pulleys to change the transmission ratio between the driving pulley and the driven pulley, thereby changing the rotational speed of the exhaust fan's shaft. In some embodiments, the inner diameters of the belt grooves of each driven pulley 12 are the same, while the inner diameters of the belt grooves of each driving pulley 11 are different, thereby utilizing different driving pulleys to change the transmission ratio between the driving pulley and the driven pulley, thereby changing the rotational speed of the exhaust fan's shaft. Therefore, there are various ways to change the transmission ratio between the driving pulley and the driven pulley. As long as the rotational speed of the driven pulley can be made greater than or equal to the rotational speed of the driving pulley, the rotational speed of the exhaust fan's shaft can be increased, thereby ultimately improving the separation effect of grain particles and debris in the grain discharge barrel.

[0063] In some embodiments, there are three driving pulleys and three driven pulleys, wherein the inner diameter of the belt groove of one driving pulley is the same as the inner diameter of the belt groove of one of the driven pulleys (i.e., the transmission ratio between the driving pulley and the driven pulley is 1), thereby making the rotation speed of the auger shaft the same as the rotation speed of the exhaust fan shaft. The inner diameters of the belt grooves of the other two driving pulleys are larger than the inner diameters of the belt grooves of the remaining two driven pulleys (i.e., the transmission ratios between the other two driving pulleys and any of the remaining driven pulleys are less than 1), thereby making the rotation speed of the exhaust fan shaft faster than the rotation speed of the auger shaft of the multi-crop shedder, thereby improving the separation effect of grain particles and debris in the grain discharge barrel.

[0064] Combined with attachment Figure 3 As a preferred embodiment of the present invention, the number of the driving pulley 11 and the number of the driven pulley 12 are both 2, the transmission ratio between one driving pulley 11 and one driven pulley 12 is 1, and the transmission ratio between the other driving pulley 11 and the other driven pulley 12 is less than 1.

[0065] In the specific implementation process, since the problem of poor separation of grain particles and debris in the grain discharge barrel basically occurs only when threshing soybeans and broad beans when the multi-crop thresher is threshing crops, the utility model only needs to set two driving pulleys and two driven pulleys, so that the rotation speed of the exhaust fan shaft is maintained within two ranges (one range is: the rotation speed of the exhaust fan shaft is the same as the rotation speed of the auger shaft, and the other range is: the rotation speed of the exhaust fan is greater than the rotation speed of the auger shaft).

[0066] During the specific implementation process, when it is found that the exhaust fan needs to provide a greater suction force (negative pressure) when threshing a certain crop, the number of driven pulleys and driving pulleys can be increased (for example, the number of driving pulleys and driven pulleys is 3, one group of driving pulleys and driven pulleys has a transmission ratio of 1, one group of driving pulleys and driven pulleys has a transmission ratio of X, and the remaining group of driving pulleys and driven pulleys has a transmission ratio of Y, where X is less than 1 and Y is less than X), so as to meet the effect of separating grain particles and debris in the grain discharge barrel. Therefore, without departing from the concept of the present invention, there is no specific restriction on the number of driving pulleys and driven pulleys, and they all fall within the scope of protection of the present invention.

[0067] In some embodiments, the speed change mechanism includes a driving pulley mounted on the auger shaft and at least two driven pulleys mounted on the rotary shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft is adjustable, and / or the axial position of the driven pulley on the rotary shaft of the exhaust fan is adjustable; the transmission ratio between the driving pulley and any one of the at least two driven pulleys is less than or equal to 1. To facilitate belt installation and normal belt transmission, it is necessary to ensure that the driving pulley is aligned with the driven pulley so that different driven pulleys can be used to change the transmission ratio with the driving pulley. Therefore, the axial position of the driving pulley and / or the driven pulley is adjustable.

[0068] In some embodiments, the axial position of the driving pulley and the axial position of the driven pulley are both adjustable. In actual operation, the alignment of the driving pulley and the driven pulley can be achieved by simply adjusting the driving pulley or the driven pulley. Therefore, as a preferred embodiment of the present invention, the axial position of the driving pulley or the driven pulley can be adjusted.

[0069] Combined with attachment Figure 4 As a preferred embodiment of the present invention, the speed change mechanism 1 includes a driving pulley mounted on the auger shaft 08 and two driven pulleys 12 mounted on the rotating shaft 052 of the exhaust fan 05. The transmission ratio between the driving pulley 1 and one of the driven pulleys 12 is 1, while the transmission ratio between the driving pulley 11 and the other driven pulley 12 is less than 1. This allows the exhaust fan's rotating shaft to be maintained within two ranges (one range: the exhaust fan's rotating shaft speed is the same as the auger shaft's speed, and the other range: the exhaust fan's speed is greater than the auger shaft's speed).

[0070] In some embodiments, the speed change mechanism 1 includes at least two driving pulleys 11 sleeved on the auger shaft 08 and one driven pulley 12 sleeved on the rotating shaft 52 of the exhaust fan 05; the axial position of the driving pulley 11 on the auger shaft 08 is adjustable, and / or the axial position of the driven pulley 12 on the rotating shaft 052 of the exhaust fan 05 is adjustable; the transmission ratio between any one of the at least two driving pulleys 11 and the driven pulley 12 is less than or equal to 1. In order to facilitate the installation of the belt 13 and the normal transmission use of the belt 13, it is necessary to ensure that the driven pulley 12 is aligned with one driving pulley 11 so that different driving pulleys 11 can be used to change the transmission ratio between the driven pulley 12 and the driving pulley 11. Therefore, the axial position of the driving pulley 11 and / or the driven pulley 12 is adjustable.

[0071] In some embodiments, the axial position of the driving pulley and the axial position of the driven pulley can both be adjusted. In actual operation, the alignment of the driving pulley 11 and the driven pulley 12 can be achieved by simply adjusting the driving pulley 11 or the driven pulley 12. Therefore, as a preferred embodiment of the present invention, the axial position of the driving pulley 11 or the driven pulley 12 can be adjusted.

[0072] In a specific implementation, the inner diameter of the belt groove of one of at least two driving pulleys 11 is the same as the inner diameter of the belt groove of the driven pulley 12, while the inner diameter of the belt groove of the remaining driving pulley 11 is larger than the inner diameter of the belt groove of the driven pulley 12. When the inner diameter of the belt groove of the driving pulley is the same as the inner diameter of the belt groove of the driven pulley, the rotational speed of the driving pulley and the driven pulley is the same. When the inner diameter of the belt groove of the driving pulley is larger than the inner diameter of the belt groove of the driven pulley, the rotational speed of the driven pulley is faster than that of the driving pulley, thereby increasing the rotational speed of the exhaust fan shaft, thereby increasing the suction force of the exhaust fan, and ultimately improving the separation of grain particles and debris in the grain discharge barrel.

[0073] Combined with attachment Figure 5 As a preferred embodiment of the present invention, the speed change mechanism includes two driving pulleys 11 sleeved on the auger shaft 08 and a driven pulley 12 sleeved on the rotating shaft 052 of the exhaust fan 05, wherein the transmission ratio of one driving pulley 11 to the driven pulley 12 is 1, and the transmission ratio of the other driving pulley 11 to the driven pulley 12 is less than 1, so that the rotational speed of the rotating shaft 052 of the exhaust fan 05 is maintained within two ranges (one range is: the rotational speed of the rotating shaft 052 of the exhaust fan 05 is the same as the rotational speed of the auger shaft 08, and the other range is: the rotational speed of the exhaust fan 05 is greater than the rotational speed of the auger shaft 08).

[0074] In the specific implementation process, there are many ways to adjust the axial position of the driving pulley 11 on the auger shaft 08 and the axial position of the driven pulley 12 on the rotating shaft 052 of the exhaust fan 05. The present invention lists the following adjustment methods.

[0075] The first method involves mounting the driving pulley on the auger shaft via a tapered sleeve and screws. The driving pulley is mounted at different positions on the auger shaft to adjust its axial position on the auger shaft. The driven pulley is mounted on the exhaust fan's rotating shaft via a tapered sleeve and screws. The driven pulley is mounted at different positions on the exhaust fan's rotating shaft to adjust its axial position on the exhaust fan's rotating shaft. The mounting of the driving and driven pulleys via tapered sleeves and screws is conventional technology and is readily understood by those skilled in the art, so further description is omitted.

[0076] The second type: combined with Figure 9 The driving pulley 11 is provided with a plurality of threaded holes 3 along the radial direction, and the auger shaft 08 is provided with a plurality of threaded holes 3 along the axial direction of the auger shaft 08. The threaded holes 3 are equipped with fastening screws 4. The driving pulley 11 and the auger shaft 08 are connected by fastening screws 4. The threaded holes 3 on the driving pulley 11 cooperate with the threaded holes 13 at different positions on the auger shaft 08 to realize the axial position adjustment of the driving pulley 11 on the auger shaft 08; the driven pulley 1 2 is provided with a plurality of threaded holes 3 along the radial direction, and a plurality of threaded holes 3 are provided on the rotating shaft 052 of the exhaust fan 05 along the axial direction of the rotating shaft, and the threaded holes 3 are equipped with fastening screws 4, and the driven pulley 12 is connected to the rotating shaft 052 of the exhaust fan 05 by the fastening screws 4, and the threaded holes 3 on the driven pulley 12 cooperate with the threaded holes 13 at different positions on the rotating shaft 052 of the exhaust fan 05 to realize the axial position adjustment of the driven pulley 12 on the rotating shaft 052 of the exhaust fan.

[0077] The third type: combined with Figure 10 , the driving pulley 11 is provided with at least one through keyway 5, and the auger shaft 08 is provided with keyways 5 of the same number as the keyways 5 on the driving pulley 11, and the radial positioning between the driving pulley 11 and the auger shaft 08 is achieved by the cooperation of the keyway 5 and the key 6; the driving pulley 11 is provided with a threaded hole 3, and the auger shaft 08 is provided with a plurality of threaded holes 3 along the axial direction of the auger shaft 08, and the threaded hole 3 is equipped with a fastening screw 4, and the fastening screw 4 passes through the threaded hole 3 on the driving pulley 11 and extends into the threaded hole 3 on the auger shaft 08 to achieve axial positioning; the threaded hole 3 on the driving pulley 11 cooperates with the threaded holes 3 at different positions on the auger shaft 08 to achieve the adjustment of the axial position of the driving pulley 11 on the auger shaft 08; the driven pulley 12 At least one through keyway 5 is provided, and the exhaust fan's rotating shaft 052 is provided with keyways 5 with the same number as the keyways on the driven pulley, and the driven pulley 12 and the exhaust fan's rotating shaft 052 are radially positioned by the cooperation of the keyway 5 and the key 6; a threaded hole 3 is provided on the driven pulley 12, and the exhaust fan's rotating shaft 052 is provided with multiple threaded holes 3 along the axial direction of the rotating shaft 052, and the threaded hole 3 is equipped with a fastening screw 4, which passes through the threaded hole 3 on the driven pulley 12 and extends into the threaded hole 3 on the exhaust fan's rotating shaft 052 to achieve axial positioning; the threaded hole 3 on the driven pulley 12 cooperates with the threaded holes 3 at different positions on the exhaust fan's rotating shaft 052 to achieve adjustment of the axial position of the driven pulley 12 on the exhaust fan's rotating shaft 052.

[0078] In a specific implementation, the length of the keyway and the length of the key on the auger shaft are greater than the length of the keyway on the driving pulley, so that when the position of the driving pulley is adjusted, the key can penetrate the entire keyway of the driving pulley, ensuring the stability of the key connection between the driving pulley and the auger shaft. Similarly, the length of the keyway and the length of the key on the rotating shaft of the exhaust fan are greater than the length of the keyway on the driven pulley, so that when the position of the driven pulley is adjusted, the key can penetrate the entire keyway of the driven pulley, ensuring the stability of the key connection between the driven pulley and the rotating shaft of the exhaust fan.

[0079] In the specific implementation process, in order to further increase the connection tightness between the driving pulley and the auger shaft, two key slots are symmetrically opened on the driving pulley, and two key slots are opened on the auger shaft. In order to increase the connection tightness between the driven pulley and the rotating shaft of the exhaust fan, two key slots are symmetrically opened on the driven pulley, and two key slots are opened on the rotating shaft of the exhaust fan.

[0080] Therefore, there are various ways to adjust the axial position of the driving pulley on the auger shaft and the axial position of the driven pulley on the rotating shaft of the exhaust fan. As long as the adjustment of the axial position can be achieved, it falls within the scope of protection of the present invention without departing from the concept of the present invention.

[0081] Combined with attachment Figure 6 and attached Figure 7 In some embodiments, the speed change mechanism 1 further includes a tensioning pulley 14 for adjusting the tension of the belt 13. The tensioning pulley 14 can be adjusted in height vertically and / or horizontally to facilitate alignment of the tensioning pulley 14 with the driving pulley 11 and the driven pulley 12. The design of the tensioning pulley 14 allows for adjustment of the position of the belt 13 while simultaneously tensioning the belt 13. The belt 13 allows the driving pulley 11 and the driven pulley 12 to be rotatably connected, thereby changing the transmission ratio between the driving pulley 11 and the driven pulley 12, and ultimately changing the rotational speed of the exhaust fan's shaft, thereby varying the suction force of the exhaust fan.

[0082] Combined with attachment Figure 8(including 8a and 8b), in some embodiments, the body 01 of the multi-crop thresher has or is equipped with a mounting portion 2, the mounting portion 2 is provided with a plurality of vertically arranged through holes 21 or the mounting portion 2 is provided with a vertically arranged strip hole, the mounting shaft 141 of the tensioning wheel 13 is provided with a screw 142, the screw 142 is provided with a locking nut 143, the screw 142 passes through the through hole 21 or the strip hole and is locked on the mounting portion 2 by the provided locking nut 143. That is to say, in some embodiments, the mounting portion 2 is a part of the body 01, the through hole 21 or the strip hole is directly provided on the body 01 of the multi-crop thresher, the screw 142 connected to the mounting shaft 141 of the tensioning wheel 14 is directly extended into the through hole 21 or the strip hole and is locked by the locking nut 143, so that the tensioning wheel 14 can be installed and secured. In some embodiments, the mounting portion 2 is mounted on the machine body 01. The mounting portion 2 itself defines a through hole 21 or a strip-shaped hole. A screw 142 connected to the mounting shaft 141 of the tensioning wheel 14 is directly inserted into the through hole 21 or the strip-shaped hole and locked with a lock nut 143 to securely mount the tensioning wheel 14. As a preferred embodiment of the present invention, the mounting portion 2 is a steel plate mounted on the machine body 01 of the multi-crop thresher. The mounting portion 2 can be secured to the machine body 01 by welding, bolting, or other methods.

[0083] During the specific implementation process, when it is necessary to adjust the height position of the tensioning wheel 14, the screw 142 on the mounting shaft 141 is passed through the through hole 21 of different heights, and then the screw 142 and the mounting shaft 141 are locked together on the mounting part 2 through the locking nut 143 to achieve the adjustment and locking of the height position of the tensioning wheel 14; or the height position of the screw 142 on the bar hole is adjusted, and then the screw 142 and the mounting shaft 141 are locked together on the mounting part 2 through the locking nut 143 to achieve the adjustment and locking of the height position of the tensioning wheel, and then the tensioning wheel 14 is used to tension the belt 13.

[0084] Combined with attachment Figure 8 (including 8a and 8b), when it is necessary to adjust the horizontal position of the tensioning pulley 14 (the belt is installed on different driven pulleys, which will cause the position of the belt to change. Therefore, it is necessary to synchronously adjust the horizontal position of the tensioning pulley to align the driven pulley, the tensioning pulley and the driving pulley with each other), the distance of the screw 142 extending out of the through hole 21 or the strip hole can be adjusted, and then the screw 142 and the mounting shaft 141 are locked together on the mounting part 2 through the locking nut 143 to achieve the adjustment of the horizontal position of the tensioning pulley 14, thereby aligning the tensioning pulley, the driving pulley and the driven pulley with each other.

[0085] During the specific implementation process, the screw rods 142 on the left and right sides of the mounting portion 2 are equipped with locking nuts 143, so as to lock the screw rods 142 on the mounting portion 2, thereby securing the tensioning wheel 14 on the mounting portion 2.

[0086] To improve the stability of screw 142, two locking nuts are provided on both the left and right sides of mounting portion 2. These two locking nuts on the left side of the mounting portion and the two locking nuts on the right side of the mounting portion work together to lock the screw to the mounting portion. In some embodiments, the locking nuts are provided with washers to enhance locking stability. Whether increasing the number of locking nuts or providing washers to enhance locking stability is a relatively common technique in the mechanical field and is readily understood by those skilled in the art, so further discussion is omitted.

[0087] In some embodiments, the mounting shaft 141 and the screw 142 of the tensioning wheel 14 are integrally formed, that is, a section of the mounting shaft 141 of the tensioning wheel 14 is reserved, and then a thread is processed to form the screw 142. In some embodiments, the screw 142 and the mounting shaft 141 are connected to each other to form a whole.

[0088] Among them, a bearing 144 is sleeved on the outer periphery of one end of the mounting shaft 141, and the tensioning wheel 14 is sleeved on the outer periphery of the bearing 144. The other end of the mounting shaft 141 is connected to the screw 142, and the screw 142 is fastened to the mounting part 2 through a locking nut 143, thereby stabilizing the tensioning wheel 14, so that when the tensioning wheel 14 rotates, the mounting shaft 141 of the tensioning wheel 14 will not rotate, and at the same time, the screw 142 connected to the mounting shaft will not rotate.

[0089] Combined with attachment Figure 11 Based on the above suction structure of the thresher for multiple crops, the utility model also provides a thresher for multiple crops, including a machine body and a grain discharge barrel, an auger shaft is arranged below the filter screen in the machine body, and the suction structure of the thresher for multiple crops mentioned above is also installed on the machine body.

[0090] Example 1

[0091] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel. The rotating shaft of the exhaust fan is equipped with a speed change mechanism, and the speed change mechanism is rotatably connected to the auger shaft of the multi-crop thresher. The speed change mechanism makes the rotation speed of the rotating shaft of the exhaust fan greater than or equal to the rotation speed of the auger shaft.

[0092] Example 2

[0093] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel. The rotating shaft of the exhaust fan is equipped with a speed change mechanism. The speed change mechanism includes a driving wheel mounted on the auger shaft and a driven wheel mounted on the rotating shaft of the exhaust fan. The transmission ratio between the driving wheel and the driven wheel is less than 1.

[0094] In this embodiment, the driving wheel and the driven wheel are pulleys, sprockets or gears. Figure 2 When the driving wheel and the driven wheel are pulleys, the driving wheel and the driven wheel are rotationally connected through a belt 13.

[0095] When the driving wheel and the driven wheel are sprockets, the driving wheel and the pulley are rotationally connected through a chain. When the driving wheel and the driven wheel are gears, the driving wheel and the driven wheel are meshed and rotationally connected.

[0096] Example 3

[0097] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, and the speed change mechanism includes a driving pulley mounted on the auger shaft and a driven pulley mounted on the rotating shaft of the exhaust fan. The number of the driving pulleys is at least 2, and the number of the driven pulleys is the same as the number of the driving pulleys. The transmission ratio between any one of the at least two driving pulleys and any one of the driven pulleys is less than or equal to 1.

[0098] Example 4

[0099] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge drum. The exhaust fan's rotating shaft is equipped with a speed change mechanism. The speed change mechanism includes a driving pulley mounted on the auger shaft and a driven pulley mounted on the exhaust fan's rotating shaft. The number of the driving pulleys is three. The transmission ratio between one driving pulley and one driven pulley is 1, and the transmission ratio between any one of the remaining two driving pulleys and any one of the remaining two driven pulleys is less than 1.

[0100] Example 5

[0101] Combined with attachment Figure 3 The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel. The rotating shaft of the exhaust fan is equipped with a speed change mechanism. The speed change mechanism includes a driving pulley sleeved on the auger shaft and a driven pulley sleeved on the rotating shaft of the exhaust fan. The number of the driving pulleys and the driven pulleys are both 2, and the transmission ratio between one driving pulley and one driven pulley is 1, while the transmission ratio between the other driving pulley and the other driven pulley is less than 1.

[0102] Example 6

[0103] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes a driving pulley mounted on the auger shaft and at least two driven pulleys mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and / or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between the driving pulley and any one of the at least two driven pulleys is less than or equal to 1.

[0104] Example 7

[0105] Combined with attachment Figure 4 The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes a driving pulley mounted on the auger shaft and two driven pulleys mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between the driving pulley and any one of the two driven pulleys is less than or equal to 1.

[0106] Example 8

[0107] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes a driving pulley mounted on the auger shaft and two driven pulleys mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between the driving pulley and any one of the two driven pulleys is less than or equal to 1.

[0108] Example 9

[0109] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes at least two driving pulleys mounted on the auger shaft and one driven pulley mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and / or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between any one of the at least two driving pulleys and the driven pulley is less than or equal to 1.

[0110] Example 10

[0111] Combined with attachment Figure 5 The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes two driving pulleys sleeved on the auger shaft and a driven pulley sleeved on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, and the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between any one of the two driving pulleys and the driven pulley is less than or equal to 1.

[0112] Example 11

[0113] The suction structure of the multi-crop thresher of this embodiment includes an exhaust fan for providing suction force to the grain discharge barrel, and the rotating shaft of the exhaust fan is equipped with a speed change mechanism, which includes two driving pulleys mounted on the auger shaft and one driven pulley mounted on the rotating shaft of the exhaust fan; the axial position of the driving pulley on the auger shaft can be adjusted, or the axial position of the driven pulley on the rotating shaft of the exhaust fan can be adjusted; the transmission ratio between any one of the two driving pulleys and the driven pulley is less than or equal to 1.

[0114] Example 12

[0115] This embodiment is based on any one of the embodiments from Example 6 to Example 11, and the driving pulley is installed on the auger shaft by means of a tapered sleeve and screws, and the driving pulley is installed at different positions on the auger shaft to thereby achieve adjustment of the axial position of the driving pulley on the auger shaft; the driven pulley is installed on the rotating shaft of the exhaust fan by means of a tapered sleeve and screws, and the driven pulley is installed at different positions on the rotating shaft of the exhaust fan to thereby achieve adjustment of the axial position of the driven pulley on the rotating shaft of the exhaust fan.

[0116] Example 13

[0117] This embodiment is based on any one of the embodiments from embodiment 6 to embodiment eleven, and the driving pulley is provided with a plurality of threaded holes along the radial direction, and the auger shaft is provided with a plurality of threaded holes along the axial direction of the auger shaft, and the threaded holes are equipped with a fastening screw, and the driving pulley and the auger shaft are connected by a fastening screw, and the threaded holes on the driving pulley cooperate with the threaded holes at different positions on the auger shaft to realize the axial position adjustment of the driving pulley on the auger shaft; the driven pulley is provided with a plurality of threaded holes along the radial direction, and the rotating shaft of the exhaust fan is provided with a plurality of threaded holes along the axial direction of the rotating shaft, and the threaded holes are equipped with a fastening screw, and the driven pulley is connected to the rotating shaft of the exhaust fan by a fastening screw, and the threaded holes on the driven pulley cooperate with the threaded holes at different positions on the rotating shaft of the exhaust fan to realize the axial position adjustment of the driven pulley on the rotating shaft of the exhaust fan.

[0118] Example 14

[0119] This embodiment is based on any one of the embodiments from the sixth to the eleventh embodiment, wherein the driving pulley is provided with at least one through keyway, the auger shaft is provided with keyways of the same number as the keyways on the driving pulley, and radial positioning is achieved between the driving pulley and the auger shaft by cooperation of the keyways and the keys; a threaded hole is provided on the driving pulley, and a plurality of threaded holes are provided on the auger shaft along the axial direction of the auger shaft, and the threaded hole is equipped with a fastening screw, and the fastening screw passes through the threaded hole on the driving pulley and extends into the threaded hole on the auger shaft to achieve axial positioning; the threaded hole on the driving pulley cooperates with different threaded holes on the auger shaft to achieve axial rotation of the driving pulley on the auger shaft Adjustment of position; the driven pulley is provided with at least one through keyway, and the exhaust fan's rotating shaft is provided with keyways with the same number as the keyways on the driven pulley, and radial positioning between the driven pulley and the rotating shaft of the exhaust fan is achieved by cooperation of the keyway and the key; the driven pulley is provided with a threaded hole, and the rotating shaft of the exhaust fan is provided with multiple threaded holes along the axial direction of the rotating shaft, and the threaded holes are equipped with fastening screws, and the fastening screws pass through the threaded holes on the driven pulley and extend into the threaded holes on the rotating shaft of the exhaust fan to achieve axial positioning; the threaded holes on the driven pulley cooperate with different threaded holes on the rotating shaft of the exhaust fan to achieve adjustment of the axial position of the driven pulley on the rotating shaft of the exhaust fan.

[0120] Example 15

[0121] This embodiment is based on the second embodiment. Since there is only one driving wheel and one driven wheel in the second embodiment, when installing the tensioning wheel, it is sufficient to align the tensioning wheel with the driving wheel and the driven wheel. Therefore, the tensioning wheel does not need to be adjusted in the horizontal position, and the tensioning wheel can be adjusted in height in the vertical direction.

[0122] In this embodiment, the driving wheel and the driven wheel are pulleys or sprockets. When the driving wheel and the driven wheel are gears, a tensioning wheel is not required for tensioning, which can be understood by those skilled in the art and will not be described in detail here.

[0123] Example 16

[0124] This embodiment is based on any one of Embodiments 3 to 14, wherein the speed change mechanism further includes a tensioning pulley for adjusting belt tension; the tensioning pulley is vertically adjustable and horizontally adjustable to facilitate alignment with the driving pulley and the driven pulley. Specifically, when the number of driving pulleys (driving sprockets) is greater than or equal to two, and / or the number of driven pulleys (driven sprockets) is greater than or equal to two, the tensioning pulley needs to be horizontally adjusted to facilitate alignment with the driving pulley and the driven pulley.

[0125] Example 17

[0126] In this embodiment, based on the sixteenth embodiment, the multi-crop thresher has or is provided with a mounting portion on its body, the mounting portion is provided with a plurality of vertically arranged through holes or the mounting portion is provided with vertically arranged strip holes, the mounting shaft of the tensioning wheel is provided with a screw, the screw is provided with a locking nut, the screw passes through the through hole or the strip hole and is locked on the mounting portion by the provided locking nut.

[0127] Embodiment 18

[0128] Combined with attachment Figure 11 This embodiment provides a multi-crop thresher, including a machine body and a grain discharge barrel. An auger shaft is arranged below the filter screen in the machine body, and the machine body is equipped with a suction structure of the multi-crop thresher described in any one of Examples 1 to 17.

Claims

1. A suction structure of a multi-crop thresher, comprising a blower (05) for providing suction force to a grain discharging barrel (04), characterized in that: The rotating shaft (052) of the exhaust fan (05) is equipped with a speed change mechanism (1), and the speed change mechanism (1) is rotatably connected to the auger shaft (08) of the multi-crop thresher. The speed change mechanism (1) makes the rotation speed of the rotating shaft (052) of the exhaust fan (05) greater than or equal to the rotation speed of the auger shaft (08).

2. The suction structure of the multi-crop thresher according to claim 1, characterized in that: The speed change mechanism (1) comprises a driving wheel sleeved on the auger shaft (08) and a driven wheel sleeved on the rotating shaft (052) of the exhaust fan (05), and the transmission ratio between the driving wheel and the driven wheel is less than 1.

3. The suction structure of the multi-crop thresher according to claim 1, characterized in that: The speed change mechanism (1) comprises a driving pulley (11) sleeved on the auger shaft (08) and a driven pulley (12) sleeved on the rotating shaft (052) of the exhaust fan (05), the number of the driving pulleys (11) is at least two, the number of the driven pulleys (12) is the same as the number of the driving pulleys (11), and the transmission ratio between any one of the at least two driving pulleys (11) and any one of the driven pulleys (12) is less than or equal to 1.

4. The suction structure of the multi-crop thresher according to claim 3, characterized in that: The number of the driving pulleys (11) and the number of the driven pulleys (12) are both two, the transmission ratio between one driving pulley (11) and one driven pulley (12) is 1, and the transmission ratio between the other driving pulley (11) and the other driven pulley (12) is less than 1.

5. The suction structure of the multi-crop thresher according to claim 1, characterized in that: The speed change mechanism (1) comprises a driving pulley (11) sleeved on the auger shaft (08) and at least two driven pulleys (12) sleeved on the rotating shaft (052) of the exhaust fan (05); the axial position of the driving pulley (11) on the auger shaft (08) is adjustable, and / or the axial position of the driven pulley (12) on the rotating shaft (052) of the exhaust fan (05) is adjustable; and the transmission ratio between the driving pulley (11) and any one of the at least two driven pulleys (12) is less than or equal to 1.

6. The suction structure of the multi-crop thresher according to claim 1, characterized in that: The speed change mechanism (1) comprises at least two driving pulleys (11) sleeved on the auger shaft (08) and one driven pulley (12) sleeved on the rotating shaft (052) of the exhaust fan (05); the axial position of the driving pulley (11) on the auger shaft (08) is adjustable, and / or the axial position of the driven pulley (12) on the rotating shaft (052) of the exhaust fan (05) is adjustable; and the transmission ratio between any one of the at least two driving pulleys (11) and the driven pulley (12) is less than or equal to 1.

7. The suction structure of the multi-crop thresher according to claim 5 or 6, characterized in that: The driving pulley (11) is provided with a plurality of threaded holes (3) along the radial direction, the auger shaft (08) is provided with a plurality of threaded holes (3) along the axial direction of the auger shaft, the threaded holes (3) are provided with fastening screws (4), the driving pulley (11) and the auger shaft (08) are connected via the fastening screws (4), the threaded holes (3) on the driving pulley (11) and the threaded holes (3) at different positions on the auger shaft (08) cooperate with each other to achieve axial position adjustment of the driving pulley (11) on the auger shaft (08); the driven pulley A plurality of threaded holes (3) are provided on the wheel (12) along the radial direction, and a plurality of threaded holes (3) are provided on the rotating shaft (052) of the exhaust fan along the axial direction of the rotating shaft, wherein the threaded holes (3) are equipped with fastening screws (4), and the driven pulley (12) and the rotating shaft (052) of the exhaust fan are connected via the fastening screws (4), and the threaded holes (3) on the driven pulley (12) and the threaded holes (3) at different positions on the rotating shaft (052) of the exhaust fan cooperate with each other to realize the axial position adjustment of the driven pulley (12) on the rotating shaft (052) of the exhaust fan.

8. The suction structure of the multi-crop thresher according to any one of claims 3 to 6, characterized in that: The speed change mechanism (1) further comprises a tensioning pulley (14) for adjusting the tensioning degree of the belt (13); the tensioning pulley (14) can be adjusted in height in the vertical direction, and / or the tensioning pulley (14) can be adjusted in the horizontal direction so as to facilitate the alignment of the tensioning pulley (14) with the driving pulley (11) and the driven pulley (12).

9. The suction structure of the multi-crop thresher according to claim 8, characterized in that: A multi-crop thresher body (01) has or is provided with a mounting portion (2), the mounting portion (2) is provided with a plurality of vertically arranged through holes (21) or the mounting portion (2) is provided with vertically arranged strip holes, the mounting shaft (141) of the tensioning wheel (14) is provided with a screw (142), the screw (142) is provided with a locking nut (143), the screw (142) passes through the through hole (21) or the strip hole and is locked on the mounting portion (2) by the provided locking nut (143).

10. A thresher for multiple crops, comprising a machine body (01) and a grain discharging barrel (04), wherein an auger shaft (08) is arranged below the filter screen in the machine body (01), characterized in that: The machine body (01) is also equipped with a suction structure of a multi-crop thresher according to any one of claims 1 to 9.

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