Stepless speed change and regulation device of harvesting machine fan, speed regulation fan and harvesting machine

Abstract

The utility model relates to a stepless speed change and regulation device for a fan of a harvesting machine, a speed regulation fan and the harvesting machine, the stepless speed change and regulation device for the fan of the harvesting machine comprises a driving part, a push rod assembly, an adjusting pull rod, an abutting part and a connecting sleeve, and the connecting sleeve is sleeved on the adjusting pull rod and is in threaded connection with the adjusting pull rod; the connecting sleeve is rotationally connected with one end of a push rod assembly, the other end of the push rod assembly is rotationally connected to the fixing part, and the middle of the push rod assembly is connected with an abutting part used for abutting against the side, away from the fixed disc, of the movable disc. The driving end of the driving part is connected with the adjusting pull rod and drives the adjusting pull rod to rotate. The adjusting pull rod drives the connecting sleeve to drive the push rod assembly to swing so as to drive the abutting part to axially move along the movable disc. By means of the lever principle, the push rod combining piece swings around the hinge point on the fixing part, the abutting piece is driven to push the movable disc to be close to the fixed disc or the movable disc automatically returns under the action of the tensioning belt after automatic returning, automatic adjustment of the gap between the fixed disc and the movable disc is achieved, and then the rotating speed of the draught fan is adjusted.

Description

Harvesting machinery blower continuously variable speed control device, speed regulating blower and harvesting machinery Technical Field

[0001] This utility model relates to the technical field of agricultural machinery, specifically to a continuously variable speed control device for a harvesting machinery fan, a speed-regulating fan, and harvesting machinery. Background Technology

[0002] Existing harvesting machinery fan speed control devices generally adjust the fan speed manually by turning a handle, and rely on the fan speed control lever to pull the shift fork to provide pulling force, which drives the moving plate to reciprocate. This operation is laborious and time-consuming, inconvenient, and has low adjustment accuracy. The moving plate and the fixed plate transmit torque through the plane contact of the trapezoidal block, resulting in unstable transmission.

[0003] Utility model patent CN216930952U discloses a continuously variable speed fan for a multifunctional grain combine harvester. The continuously variable speed mechanism includes an active speed-changing wheel and a passive speed-changing wheel. The active speed-changing wheel is fixed to the shaft head of the main drive shaft, and the passive speed-changing wheel is fixed to the shaft head of the fan shaft. The active speed-changing wheel includes an active speed-changing wheel fixed plate and an active speed-changing wheel moving plate, with a V-shaped gap between the active speed-changing wheel fixed plate and the active speed-changing wheel moving plate. The passive speed-changing wheel includes a passive speed-changing wheel fixed plate and a passive speed-changing wheel moving plate, with a V-shaped gap between the passive speed-changing wheel fixed plate and the passive speed-changing wheel moving plate. A belt is wound within the V-shaped gap between the active speed-changing wheel and the passive speed-changing wheel. On the side of the driven disc of the active transmission wheel away from the fixed disc, a bearing seat, a bearing thrust seat, and an adjusting screw are sequentially arranged. A tapered roller bearing is fitted between the bearing seat and the bearing thrust seat. The adjusting screw passes through an adjusting bracket, which is fixedly installed. An anti-loosening adjusting handle is also engaged on the adjusting screw. This scheme adjusts the distance between the fixed disc and the driven disc of the active transmission wheel by rotating the adjusting screw. When the distance changes, the position of the belt within the V-shaped gap of the active transmission wheel changes, thereby changing the transmission ratio between the active and passive transmission wheels, achieving stepless adjustment of the harvester's fan airflow. However, this adjustment method is time-consuming and labor-intensive, and its practicality is limited. Summary of the Invention

[0004] This utility model addresses one or more technical problems existing in the prior art by providing a continuously variable speed control device for a harvesting machinery fan, a speed-regulating fan, and harvesting machinery.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A continuously variable speed control device for a harvesting machinery fan includes a drive unit, a push rod assembly, an adjusting rod, an abutment, and a connecting sleeve. The connecting sleeve is sleeved on the adjusting rod and threadedly connected to the adjusting rod. The connecting sleeve is rotatably connected to one end of the push rod assembly, and the other end of the push rod assembly is rotatably connected to a fixed unit. The middle part of the push rod assembly is connected to an abutment for abutting against the side of the moving plate opposite to the fixed plate. The drive end of the drive unit is connected to the adjusting rod and drives the adjusting rod to rotate. The adjusting rod drives the connecting sleeve to cause the push rod assembly to swing, thereby causing the abutment to move along the axial direction of the moving plate.

[0006] The beneficial effects of this utility model are as follows: The stepless speed regulation device for harvesting machinery blowers of this utility model uses the drive unit to drive the adjusting rod to rotate. By means of the lever principle, the adjusting rod drives the connecting sleeve and the push rod assembly on it to swing around the hinge point on the fixed part, which drives the abutment to push the moving plate close to the fixed plate. Alternatively, after the push rod assembly returns to its original position, the moving plate automatically returns to its original position under the action of the tension belt, and the fixed plate maintains its original position and rotates, thereby realizing the automatic adjustment of the gap between the fixed plate and the moving plate, and thus adjusting the speed of the blower.

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

[0008] Furthermore, the abutment includes a metal sleeve, the sidewall of which is rotatably connected to the push rod assembly via a locating pin, the axis of which is perpendicular to the axis of the metal sleeve.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the metal sleeve is rotatably connected to the push rod assembly through the positioning pin, and the metal sleeve can rotate appropriately around the positioning pin to adapt to the contact surface on the moving plate side.

[0010] Furthermore, the push rod assembly includes a first push rod and a second push rod, with the two ends of the first push rod and the two ends of the second push rod respectively fixedly connected, and the middle parts of the first push rod and the middle parts of the second push rod being far apart from each other to form a first limiting interval, with the abutting member located within the first limiting interval.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting two push rods and placing the abutment within the first limiting interval in the middle of the two push rods, the abutment can be stably limited.

[0012] Furthermore, the middle parts of the first push rod and the second push rod are parallel to each other, and both the middle parts of the first push rod and the middle parts of the second push rod are provided with positioning pins. The two positioning pins are arranged coaxially, and the side wall of the abutment is provided with two coaxially arranged connecting holes. The two positioning pins are respectively inserted and limited in the corresponding connecting holes.

[0013] The beneficial effect of adopting the above-mentioned further solution is that arranging the middle part of the first push rod and the middle part of the second push rod parallel to each other is conducive to the stable setting of the abutment between the first push rod and the second push rod.

[0014] Furthermore, a second limiting interval is reserved between one end of the first push rod and one end of the second push rod, and the connecting sleeve is rotatably connected within the second limiting interval; a third limiting interval is reserved between the other end of the first push rod and the other end of the second push rod, and the fixing part is rotatably connected within the third limiting interval.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by setting the second limit interval and the third limit interval, it is convenient to stably connect the connecting sleeve and the fixing part between the first push rod and the second push rod.

[0016] Furthermore, one end of the first push rod is provided with a first limiting hole, and one end of the second push rod is provided with a second limiting hole. The first limiting hole and the second limiting hole are arranged coaxially. The two ends of the connecting sleeve are respectively rotatably connected to the first limiting hole and the second limiting hole through a rotating shaft. The connecting sleeve is provided with a threaded hole that is threadedly connected to the adjusting pull rod. The central axis of the threaded hole is perpendicular to the central axis of the rotating shaft.

[0017] Furthermore, one end of the first push rod and one end of the second push rod are parallel to each other and are fixedly connected by a first bolt. A first spacer is sleeved on the first bolt, and the first spacer is located within the second limiting interval. The other end of the first push rod and the other end of the second push rod are parallel to each other and are fixedly connected by a second bolt. A second spacer is rotatably sleeved on the second bolt, and the second spacer is located within the third limiting interval. The fixing part is fixedly connected to the second spacer.

[0018] The beneficial effect of adopting the above-mentioned further solution is that by setting the first spacer and the second spacer, it is beneficial to stabilize the connection between the two ends of the first push rod and the two ends of the second push rod.

[0019] Furthermore, the adjusting rod is provided with two sets of limiting nuts, which are located on both sides of the connecting sleeve respectively; the connecting sleeve is also provided with an oil injection hole, and a straight-through pressure oil injection cup is connected to the oil injection hole.

[0020] The beneficial effect of adopting the above-mentioned further solution is that by setting two sets of limit nuts, the connecting sleeve can reciprocate stably between the two sets of limit nuts, thus preventing the connecting sleeve from coming off the adjusting rod.

[0021] The variable speed fan includes the aforementioned continuously variable speed control device for harvesting machinery fans, and also includes a fan, a fixed plate, and a moving plate. The fixed plate and the moving plate are connected and cooperated by guide columns, and the fixed plate and the moving plate are connected to the fan via a transmission belt.

[0022] The beneficial effects of this utility model are: the speed-regulating fan of this utility model can adjust the speed of the fan by changing the transmission ratio of the transmission belt through adjusting the distance between the fixed plate and the moving plate.

[0023] The harvesting machinery includes the aforementioned speed-regulating fan and a harvesting machinery body. The harvesting machinery body is equipped with a power shaft, which is coaxially and fixedly connected to a fixed plate and provides power.

[0024] The beneficial effects of this utility model are: the harvesting machinery of this utility model can realize stepless adjustment of the speed of its upper fan. Attached Figure Description

[0025] Figure 1 is a top view of the continuously variable speed control device for harvesting machinery blowers of this utility model.

[0026] Figure 2 is a schematic cross-sectional view of BB in Figure 1;

[0027] Figure 3 is a schematic diagram of the main structure of the stepless speed regulation device for harvesting machinery blower of this utility model.

[0028] Figure 4 is a schematic cross-sectional view of AA in Figure 3;

[0029] Figure 5 is a three-dimensional structural schematic diagram of the continuously variable speed regulation device for harvesting machinery blowers of this utility model.

[0030] Figure 6 is a side view of the continuously variable speed control device for harvesting machinery fans of this utility model.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Drive motor; 11. First gear; 12. Second gear;

[0033] 2. Adjusting rod; 21. Limit nut;

[0034] 3. Connecting sleeve; 31. Rotating shaft; 33. Straight-through pressure injection cup;

[0035] 4. Connecting parts;

[0036] 5. First push rod; 51. Second push rod; 52. Locating pin; 53. First bolt; 54. Second bolt; 55. First spacer; 56. Second spacer;

[0037] 6. Fixed plate; 7. Moving plate; 71. Fixed plate; 72. Drive shaft; 73. Release bearing. Detailed Implementation

[0038] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0039] Example 1

[0040] As shown in Figures 1 to 6, the continuously variable speed control device for the harvesting machinery fan in this embodiment includes a drive unit, a push rod assembly, an adjusting rod 2, an abutment 4, and a connecting sleeve 3. The connecting sleeve 3 is sleeved on the adjusting rod 2 and threadedly connected to the adjusting rod 2. The connecting sleeve 3 is rotatably connected to one end of the push rod assembly, and the other end of the push rod assembly is rotatably connected to the fixed part. The middle part of the push rod assembly is connected to the abutment 4 for abutting against the side of the moving plate 7 away from the fixed plate 71. The drive end of the drive unit is connected to the adjusting rod 2 and drives the adjusting rod 2 to rotate. The adjusting rod 2 drives the connecting sleeve 3 to cause the push rod assembly to swing, thereby causing the abutment 4 to move axially along the moving plate 7.

[0041] In this embodiment, the drive unit primarily provides power to the entire speed control device. It can be a drive structure consisting of a drive motor and a reducer, specifically including a drive motor 1, a first gear 11, and a second gear 12. The output shaft of the drive motor 1 is connected to the first gear 11, which meshes with the second gear 12. One end of the adjusting rod 2 is perpendicularly and fixedly connected to the center of the second gear 12. The outer surface of the adjusting rod 2 has an external thread that matches the internal thread of the connecting sleeve 3. The drive motor can electrically control the rotation of the two gears via buttons in the cab, driving the adjusting rod 2 to move axially. The fan speed parameters can also be monitored in real-time using a display in the cab, providing immediate and efficient operation.

[0042] The fixing part can be a fixing plate 6, or any structure on the harvesting machinery that can achieve the fixing effect.

[0043] The continuously variable speed control device for the harvesting machinery fan in this embodiment uses a drive unit to drive the adjusting rod to rotate. Based on the lever principle, the adjusting rod drives the connecting sleeve and the push rod assembly on it to swing around the hinge point on the fixed part. This drives the abutment to push the moving plate close to the fixed plate or return to its original position. The moving plate then automatically returns to its original position under the action of the tension belt, while the fixed plate rotates in its original position. This achieves automatic adjustment of the gap between the fixed plate and the moving plate, thereby adjusting the fan speed.

[0044] Example 2

[0045] Based on Embodiment 1, a preferred embodiment of the abutment member in this embodiment is that the abutment member 4 includes a metal sleeve, the sidewall of which is rotatably connected to the push rod assembly via a positioning pin 52, the axis of which is perpendicular to the axis of the metal sleeve. The metal sleeve is rotatably connected to the push rod assembly via the positioning pin, and can rotate appropriately around the positioning pin to adapt to the contact surface on one side of the moving plate.

[0046] The metal sleeve can be a circular sleeve.

[0047] Specifically, the positioning pin 52 is fitted with a bushing, which is fixedly connected to the positioning pin 52. The bushing passes through the push rod assembly and is clearance-fitted with the push rod assembly. The positioning pin 52 is fixedly connected to the metal sleeve, enabling relative rotation between the metal sleeve and the push rod assembly. Thus, when the push rod assembly rotates, the metal sleeve remains stationary, always maintaining coaxiality with the moving plate, ensuring that the moving plate is subjected to uniform and stable force.

[0048] More preferably, the metal sleeve is a steel sleeve, specifically a hexagonal threaded steel sleeve. The outer circumferential sidewall of the steel sleeve is a regular hexagon, and a threaded channel can be formed through the opposite sides of the regular hexagon for threaded connection with the adjusting rod 2. The use of a hexagonal threaded steel sleeve facilitates drilling of threaded holes. The hexagonal threaded steel sleeve cooperates with the adjusting rod, and reciprocates through threaded transmission, resulting in high adjustment accuracy.

[0049] Example 3

[0050] Based on Embodiment 1 or Embodiment 2, a preferred embodiment of the push rod assembly in this embodiment includes a first push rod 5 and a second push rod 51. The two ends of the first push rod 5 and the two ends of the second push rod 51 are fixedly connected. The middle portions of the first push rod 5 and the middle portions of the second push rod 51 are spaced apart to form a first limiting interval. The abutment 4 is located within this first limiting interval. By setting two push rods and placing the abutment within the first limiting interval between the two push rods, the abutment can be stably limited.

[0051] Optionally, the middle portions of the first push rod 5 and the second push rod 51 are parallel to each other. Each middle portion of the first push rod 5 and the second push rod 51 is provided with a positioning pin 52, which are coaxially arranged. The side wall of the abutment member 4 is provided with two coaxially arranged connecting holes, and the two positioning pins 52 are respectively inserted into and limited within the corresponding connecting holes. Arranging the middle portions of the first push rod and the second push rod parallel to each other facilitates the stable placement of the metal sleeve between the first and second push rods.

[0052] Optionally, a second limiting interval is provided between one end of the first push rod 5 and one end of the second push rod 51, and the connecting sleeve 3 is rotatably connected within the second limiting interval; a third limiting interval is provided between the other end of the first push rod 5 and the other end of the second push rod 51, and the fixing part is rotatably connected within the third limiting interval. By setting the second and third limiting intervals, it is convenient to stably connect the connecting sleeve and the fixing part between the first push rod and the second push rod.

[0053] The spacing of the first limiting interval is greater than the spacing of the second limiting interval, and the spacing of the second limiting interval is greater than the spacing of the third limiting interval.

[0054] Specifically, one end of the first push rod 5 is provided with a first limiting hole, and one end of the second push rod 51 is provided with a second limiting hole. The first limiting hole and the second limiting hole are arranged coaxially. The two ends of the connecting sleeve 3 are respectively rotatably connected to the first limiting hole and the second limiting hole through the rotating shaft 31. The connecting sleeve 3 is provided with a threaded hole that is threadedly connected to the adjusting pull rod 2. The central axis of the threaded hole is perpendicular to the central axis of the rotating shaft 31.

[0055] More preferably, one end of the first push rod 5 and one end of the second push rod 51 are parallel to each other and are connected and fixed by a first bolt 53. A first spacer 55 is sleeved on the first bolt 53, and the first spacer 55 is located within the second limiting interval. The other end of the first push rod 5 and the other end of the second push rod 51 are parallel to each other and are connected and fixed by a second bolt 54. A second spacer 56 is rotatably sleeved on the second bolt 54, and the second spacer 56 is located within the third limiting interval. The fixing part is fixedly connected to the second spacer 56. By setting the first spacer and the second spacer, structural support is provided, deformation is reduced, friction is alleviated, and it is beneficial to the stable connection between the two ends of the first push rod and the two ends of the second push rod.

[0056] Specifically, two first bolts 53 can be provided at one end of the first push rod 5 and one end of the second push rod 51 to ensure a stable connection between the first push rod 5 and the second push rod 51. Two second bolts 54 are provided at the other end of the first push rod 5 and the other end of the second push rod 51. A second spacer 56 rotatably connected to the outermost second bolt 54 is fixedly connected to the fixing part, allowing the outermost second bolt 54 to rotate around the second spacer 56.

[0057] In this embodiment, the push rod assembly is composed of two trapezoidal structural plates connected by bolts. The connection has an internal spacer to provide support, reduce friction, and improve reliability.

[0058] Example 4

[0059] Based on any of the embodiments 1 to 3, this embodiment provides a preferred solution where the adjusting rod 2 is provided with two sets of limiting nuts 21, located on both sides of the connecting sleeve 3; the connecting sleeve 3 is also provided with an oil injection hole, and a straight-through pressure injection cup 33 is connected to the oil injection hole. By setting two sets of limiting nuts, the connecting sleeve can reciprocate stably between the two sets of limiting nuts, preventing the connecting sleeve from detaching from the adjusting rod. The straight-through pressure injection cup can add lubricant to reduce frictional resistance.

[0060] The adjusting rod 2 can be equipped with two opposite threaded sections. Two sets of limiting nuts 21 are threaded onto these two sections with opposite helical directions. The outermost set of limiting nuts 21 is threaded onto one threaded section and positioned close to the other opposite threaded section. Since the other opposite threaded section is longer, the connecting sleeve 3 can be threaded onto it. The adjusting rod 2 and the connecting sleeve 3 cooperate, causing the connecting sleeve to reciprocate between the two sets of limiting nuts 21 via threaded transmission.

[0061] Example 5

[0062] This embodiment provides a speed-regulating fan, including the continuously variable speed control device for harvesting machinery fans from any of the embodiments 1 to 4 above. It also includes a fan, a fixed plate 71, and a moving plate 7. The fixed plate 71 and the moving plate 7 are connected by guide posts and are driven by a transmission belt. A release bearing 73 is provided on the side of the moving plate 7 facing away from the fixed plate 71. A metal sleeve can be mounted on the release bearing 73, which remains concentric with the moving plate 7 during the swinging of the push rod assembly, driving the release bearing 73 to reciprocate. The release bearing 73, in turn, drives the moving plate 7 to reciprocate. The axial reciprocating motion of the moving plate 7 changes the gap between it and the fixed plate 71, adjusting the belt tension and changing the transmission ratio. The fixed plate rotates in its original position, axially connected to the moving plate via guide posts.

[0063] In this embodiment, the speed-regulating fan adjusts the speed by changing the transmission ratio of the drive belt through adjusting the distance between the fixed disc and the moving disc.

[0064] Example 6

[0065] This embodiment also provides a harvesting machine, including the speed-regulating fan of the above embodiment 5, and a harvesting machine body. The harvesting machine body is provided with a power shaft 72, which is coaxially and fixedly connected to the fixed plate 71 and the moving plate 7 and provides power.

[0066] Among them, the power shaft 72 can be a cleaning drive shaft on the harvesting machinery, which provides power.

[0067] The harvesting machinery in this embodiment can achieve stepless adjustment of the speed of its blower.

[0068] In the description of this utility model, it should be understood that the terms "center", "length", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A continuously variable speed control device for a harvesting machinery blower, characterized in that, The device includes a drive unit, a push rod assembly, an adjusting rod, a stop member, and a connecting sleeve. The connecting sleeve is fitted onto the adjusting rod and threadedly connected to it. One end of the connecting sleeve is rotatably connected to the push rod assembly, and the other end of the push rod assembly is rotatably connected to a fixed part. The middle part of the push rod assembly is connected to a stop member for abutting against the side of the moving plate opposite to the fixed plate. The drive end of the drive unit is connected to the adjusting rod and drives the adjusting rod to rotate. The adjusting rod drives the connecting sleeve to cause the push rod assembly to swing, thereby causing the stop member to move axially along the moving plate.

2. The continuously variable speed control device for harvesting machinery blowers according to claim 1, characterized in that, The abutment includes a metal sleeve, the sidewall of which is rotatably connected to the push rod assembly via a locating pin, the axis of which is perpendicular to the axis of the metal sleeve.

3. The continuously variable speed control device for harvesting machinery blowers according to claim 1 or 2, characterized in that, The push rod assembly includes a first push rod and a second push rod. The two ends of the first push rod and the two ends of the second push rod are fixedly connected. The middle parts of the first push rod and the middle parts of the second push rod are far apart to form a first limiting interval. The abutment is located within the first limiting interval.

4. The continuously variable speed control device for harvesting machinery blowers according to claim 3, characterized in that, The middle parts of the first push rod and the middle parts of the second push rod are parallel to each other. Both the middle parts of the first push rod and the middle parts of the second push rod are provided with positioning pins. The two positioning pins are arranged coaxially. The side wall of the abutment is provided with two coaxially arranged connecting holes. The two positioning pins are respectively inserted and limited in the corresponding connecting holes.

5. The continuously variable speed control device for harvesting machinery blowers according to claim 3, characterized in that, A second limiting interval is reserved between one end of the first push rod and one end of the second push rod, and the connecting sleeve is rotatably connected within the second limiting interval; a third limiting interval is reserved between the other end of the first push rod and the other end of the second push rod, and the fixing part is rotatably connected within the third limiting interval.

6. The continuously variable speed control device for harvesting machinery blowers according to claim 5, characterized in that, One end of the first push rod has a first limiting hole, and one end of the second push rod has a second limiting hole. The first limiting hole and the second limiting hole are arranged coaxially. The two ends of the connecting sleeve are respectively rotatably connected to the first limiting hole and the second limiting hole through a rotating shaft. The connecting sleeve has a threaded hole that is threadedly connected to the adjusting pull rod. The central axis of the threaded hole is perpendicular to the central axis of the rotating shaft.

7. The continuously variable speed control device for harvesting machinery blowers according to claim 5, characterized in that, One end of the first push rod and one end of the second push rod are parallel to each other and are fixed together by a first bolt. A first spacer is fitted on the first bolt and the first spacer is located within the second limiting interval. The other end of the first push rod and the other end of the second push rod are parallel to each other and are fixed together by a second bolt. A second spacer is rotatably fitted on the second bolt and the second spacer is located within the third limiting interval. The fixing part is fixedly connected to the second spacer.

8. The continuously variable speed control device for harvesting machinery blowers according to claim 1, characterized in that, The adjusting rod is provided with two sets of limiting nuts, which are located on both sides of the connecting sleeve. The connecting sleeve is also provided with an oil injection hole, and a straight-through pressure oil injection cup is connected to the oil injection hole.

9. A speed-regulating fan, characterized in that, The continuously variable speed control device for harvesting machinery blowers according to any one of claims 1 to 8 further includes a blower, a fixed plate, and a moving plate, wherein the fixed plate and the moving plate are connected and cooperated by guide columns, and the fixed plate and the moving plate are connected to the blower by a transmission belt.

10. Harvesting machinery, characterized in that, The system includes the speed-regulating fan as described in claim 9, and also includes a harvesting machinery body, wherein the harvesting machinery body is provided with a power shaft, and the power shaft is coaxially and fixedly connected to the fixed plate and provides power.

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