Transmission mechanism for seeder

Abstract

The utility model relates to the technical field of seeders, in particular to a transmission mechanism for a seeder. Comprising a rack, land wheels are rotatably mounted at the bottom of the rack, two mounting plates are fixedly mounted at the top of the rack, transmission wheels are rotatably mounted at the ends, close to the land wheels, of the mounting plates, and driving chain wheels are coaxially and fixedly mounted on the transmission wheels; a driven rotating shaft is rotationally mounted on the mounting plate, a driven chain wheel is fixedly mounted on the driven rotating shaft, and the driven chain wheel is in transmission connection with the driving chain wheel through a first chain; a standard chain wheel is further fixedly installed on the driven rotating shaft, a tensioning chain wheel capable of sliding up and down is rotationally installed in the middle of the installation plate, an output shaft is rotationally installed at the end, away from the land wheel, of the installation plate, and a plurality of speed change chain wheels different in diameter are fixedly installed on the output shaft. The angular speed of the output shaft is controlled through the transmission ratios of different variable-speed chain wheels, so that the seeder can cope with soil with different fertile degrees, and the applicability of the seeder and the utilization rate of the soil are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seed drills, in particular to a transmission mechanism for seed drills. Background Art

[0002] The transmission mechanism of the seeder is the key to the seeder's completion of tasks such as sowing and fertilizing. It mainly uses the rotation of the ground wheel as the power source. The rotation of the ground wheel drives the transmission wheel to rotate, and the transmission wheel then transmits the power to the sowing assembly and fertilization assembly on the seeder through the sprocket group, thereby realizing the sowing and fertilization of the seeder.

[0003] In the prior art, the transmission mechanism of the seeder often transmits power through direct transmission of multiple sprockets and lacks an adjustment function. In actual sowing conditions, it is often necessary to adjust the sowing rate (i.e., the sowing interval) according to factors such as the fertility of the soil. A seeder that lacks an adjustment function can only be used for land in a certain area. When used on other lands with different degrees of soil fertility, its applicability is poor and the soil utilization rate is low. Utility Model Content

[0004] In view of the above problems, the utility model provides a transmission mechanism for a seed drill to solve the problem of poor applicability due to lack of adjustment capability in the prior art.

[0005] The utility model is realized by using the following technical scheme: a transmission mechanism for a seed drill, comprising a frame, a ground wheel is installed on the frame, a support frame is provided on the frame, a transmission wheel is installed on the support frame, the ground wheel can drive the transmission wheel to rotate through friction, a driven shaft is rotatably installed on the support frame, the driven shaft is transmission-connected with the transmission wheel, a standard sprocket is fixedly installed on the driven shaft, an output shaft is installed on the support frame, a plurality of speed-changing sprockets with different diameters are fixedly installed on the output shaft, and the standard sprocket and any one of the speed-changing sprockets can be transmission-connected through a second chain.

[0006] Through the above structure, the ground wheel transmits power to the standard sprocket, and the standard sprocket transmits power through the second chain and the speed-changing sprocket. When the sowing and fertilizing rates need to be changed, it is only necessary to adjust the speed-changing sprocket driven by the second chain. The angular velocity of the output shaft is controlled by the transmission ratio of different speed-changing sprockets, thereby changing the subsequent fertilization and sowing rates, allowing the seeder to cope with soils of different fertility levels, thereby increasing the applicability of the seeder and the utilization rate of the soil.

[0007] Furthermore, the driving sprocket is coaxially fixedly mounted on the transmission wheel, a driven sprocket is fixedly mounted on the driven rotating shaft, and the driven sprocket is connected to the driving sprocket through a first chain transmission.

[0008] Further, the support frame includes mounting plates fixedly installed on both sides of the frame. A tension sprocket that can slide up and down is rotatably installed in the middle of the mounting plate. The tension sprocket is located between the standard sprocket and the variable-speed sprockets. The standard sprocket, any one of the variable-speed sprockets, and the tension sprocket are driven by a second chain.

[0009] Further, a tension rotating shaft is coaxially and fixedly installed on the tension sprocket. Sliders are rotatably installed at both ends of the tension rotating shaft. The sliders are installed on the inner wall of the mounting plate and can slide up and down. Through the arrangement of the sliders and the tension rotating shaft, the tension sprocket between the mounting plates can not only slide up and down but also rotate.

[0010] Further, a first sliding groove is provided on the inner wall of the mounting plate. The first sliding groove is in sliding fit with the slider. A tension spring is fixedly installed at the bottom of the first sliding groove. The top of the tension spring is fixedly connected to the slider. Through the arrangement of the tension spring, the tension sprocket can automatically adjust its position up and down according to the magnitude of the pressure of the second chain.

[0011] Further, a first mounting frame is installed between the ground wheel and the frame. One end of the first mounting frame is fixedly connected to the frame, and the other end of the first mounting frame is rotatably connected to the ground wheel; a second mounting frame is installed between the drive wheel and the mounting plate. One end of the second mounting frame is rotatably connected to the driven rotating shaft, and the other end of the second mounting frame is rotatably connected to the drive wheel. Through the above structure, the installation between the frame and the ground wheel and the drive wheel can be made more stable.

[0012] Further, an oil cylinder is also hinged on the first mounting frame. The output end of the oil cylinder is hinged to the second mounting frame. Through the arrangement of the oil cylinder, when the seeder turns or travels on a road where sowing is not required, the drive wheel can be disengaged from the ground wheel, thus avoiding waste of seeds.

[0013] Further, an adjusting mechanism for adjusting the pressure between the ground wheel and the drive wheel is also installed between the second mounting frame and the frame. Through the adjusting structure, the pressure between the ground wheel and the drive wheel can be adjusted.

[0014] Further, the adjusting mechanism includes a fixing plate fixedly installed on the frame. A first threaded rod is slidably installed in the middle of the fixing plate. One end of the first threaded rod close to the second mounting frame is fixedly installed with an adjusting plate. An adjusting spring is fixedly installed on the adjusting plate. The end of the adjusting spring away from the adjusting plate is fixedly connected to the second mounting frame; two adjusting nuts are also in threaded fit with the first threaded rod. The fixing plate is located between the two adjusting nuts. By moving the first threaded rod, the adjusting spring is compressed or stretched, thereby adjusting the magnitude of the pressure between the ground wheel and the drive wheel.

[0015] Furthermore, a connecting plate is fixedly mounted on one end of the first mounting frame away from the frame, and a scraper is mounted on one end of the connecting plate away from the first mounting frame; a second arc-shaped slide groove is provided on the top of the connecting plate, a second threaded rod is slidably mounted on the second slide groove, one end of the second threaded rod is fixedly connected to the scraper, and a fixing nut is threadedly matched on the other end of the second threaded rod; the bottom of the scraper is hinged to the connecting plate through a hinge shaft. The angle of the scraper can be adjusted by setting the second slide groove and the second threaded column.

[0016] In summary, the beneficial effects of the present invention are:

[0017] 1. The angular velocity of the output shaft is changed by transmitting the standard sprocket with the speed-changing sprocket of different diameters, thereby changing the fertilization and sowing rates of the fertilization assembly and the sowing assembly connected to the output shaft, so that the fertilization and sowing rates can be handled on different lands, thereby increasing the applicability of the device and improving the utilization rate of the land.

[0018] 2. By setting a plurality of standard sprockets and tensioning sprockets, the speed change sprocket groups correspond to the standard sprockets and the tensioning sprockets, thereby minimizing the bending degree of the second chain in the horizontal direction, thereby improving the service life of the second chain and further increasing the transmission stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a sprocket group;

[0021] Figure 3 It is a structural schematic diagram of the tensioning sprocket;

[0022] Figure 4 for Figure 1 A partial enlarged view of the "A" area.

[0023] In the figure: 1-frame; 11-mounting plate; 12-first mounting frame; 13-second mounting frame; 2-ground wheel; 21-transmission wheel; 22-driving shaft; 23-driving sprocket; 24-driven sprocket; 25-driven shaft; 3-standard sprocket; 4-tensioning sprocket; 41-tensioning shaft; 42-first slide groove; 43-slider; 44-tensioning spring; 5-speed sprocket; 51-output shaft; 6-adjusting mechanism; 61-adjusting spring; 62-adjusting plate; 63-first threaded rod; 64-adjusting nut; 65-fixing plate; 7-oil cylinder; 81-connecting plate; 82-scraper; 83-articulated shaft; 84-second slide groove; 85-second threaded rod; 86-fixing nut. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0027] like Figure 1 , Figure 2 As shown, the utility model provides a transmission mechanism for a seed drill, including a frame 1, a ground wheel 2 is rotatably mounted on the bottom of the frame 1; specifically, a first mounting frame 12 is fixedly mounted on the bottom of the frame 1, and one end of the first mounting frame 12 away from the frame 1 is rotatably connected to the ground wheel 2. A support frame is fixedly mounted on the top of the frame 1, wherein the support frame includes a mounting plate 11 fixedly mounted on both sides of the top of the frame 1, a transmission wheel 21 is rotatably mounted on one end of the mounting plate 11 close to the ground wheel 2, and the ground wheel 2 can drive the transmission wheel 21 to rotate through friction, and the transmission wheel 21 is coaxially fixedly mounted with a driving sprocket 23; specifically, a second mounting frame 13 is rotatably mounted on one end of the mounting plate 11 close to the ground wheel 2, and one end of the second mounting frame 13 away from the mounting plate 11 is rotatably connected to the transmission wheel 21, and a driving shaft 22 is rotatably mounted on the second mounting frame 13, and the driving shaft 22 is fixedly connected to the transmission wheel 21 and the driving sprocket 23.

[0028] A driven shaft 25 is rotatably mounted on one end of the mounting plate 11 close to the transmission wheel 21, and the driven shaft 25 is rotatably matched with the second mounting frame 13; a driven sprocket 24 is fixedly mounted on one end of the driven shaft 25 close to the driving sprocket 23, and the driven sprocket 24 is connected to the driving sprocket 23 through a first chain transmission. A standard sprocket 3 is also fixedly mounted on the driven shaft 25, a tensioning sprocket 4 that can slide up and down is rotatably mounted on the middle part of the mounting plate 11, and an output shaft 51 is rotatably mounted on one end of the mounting plate 11 away from the ground wheel 2, and a plurality of speed-changing sprockets 5 of different diameters are fixedly mounted on the output shaft 51, and the standard sprocket 3, the tensioning sprocket 4, and any speed-changing sprocket 5 can be connected through a second chain transmission, and the output shaft 51 can be connected to the fertilization assembly and the sowing assembly through transmission.

[0029] like Figure 2 , Figure 3As shown in the figure, a tensioning shaft 41 is coaxially and fixedly installed on the tensioning sprocket 4. Sliders 43 are rotatably installed at both ends of the tensioning shaft 41. The sliders 43 are installed on the inner wall of the mounting plate 11 and can slide up and down. Specifically, a first chute 42 is provided on the inner wall of the mounting plate 11. The first chute 42 is in sliding fit with the slider 43. A tensioning spring 44 is fixedly installed at the bottom of the first chute 42, and the top of the tensioning spring 44 is fixedly connected to the slider 43.

[0030] The existence of the tensioning sprocket 4 is the basis for the transmission between the standard sprocket 3 and the variable-speed sprocket 5. When the second chain switches from the variable-speed sprocket 5 with a larger diameter to the variable-speed sprocket 5 with a smaller diameter, the second chain will become loose. At this time, the extrusion force on the tensioning spring 44 decreases, driving the tensioning sprocket 4 to move upward until the second chain is lifted, thus maintaining the stability of the transmission between the standard sprocket 3 and the variable-speed sprocket 5. When the second chain switches from the variable-speed sprocket 5 with a smaller diameter to the variable-speed sprocket 5 with a larger diameter, the second chain tightens and will squeeze the tensioning sprocket 4 again.

[0031] As a further illustration of this embodiment, three standard sprockets 3 and three tensioning sprockets 4 are provided, and six variable-speed sprockets 5 are provided. The six variable-speed sprockets 5 are combined in pairs to form three groups. One group of variable-speed sprockets 5 corresponds to the position of one tensioning sprocket 4 and one standard sprocket 3.

[0032] Among them, the number of the standard sprockets 3, the tensioning sprockets 4, and the variable-speed sprockets 5 in this device is not unique and can be installed according to the actual situation. The purpose of multiple standard sprockets 3 and tensioning sprockets 4 is to reduce the lateral bending of the second chain when switching the second chain. There is only one second chain, and it needs to be switched between the combinations of the three.

[0033] As a further illustration of this embodiment, an oil cylinder 7 is also hinged on the first mounting frame 12, and the output end of the oil cylinder 7 is hinged to the second mounting frame 13. In the case where sowing and fertilizing are not required, in order to avoid waste, the second mounting frame 13 can be rotated upward by the oil cylinder 7, so that the driving wheel 21 is disengaged from the ground wheel 2.

[0034] As Figure 1 、 Figure 2 shown in the figure, an adjusting mechanism 6 for adjusting the pressure between the ground wheel 2 and the driving wheel 21 is also installed between the second mounting frame 13 and the frame 1. Specifically, the adjusting mechanism 6 includes a fixing plate 65 fixedly installed on the frame 1. A first threaded rod 63 is slidably installed in the middle of the fixing plate 65. One end of the first threaded rod 63 close to the second mounting frame 13 is fixedly installed with an adjusting plate 62. An adjusting spring 61 is fixedly installed on the adjusting plate 62. The end of the adjusting spring 61 away from the adjusting plate 62 is fixedly connected to the second mounting frame 13. Two adjusting nuts 64 are also in threaded fit on the first threaded rod 63, and the fixing plate 65 is located between the two adjusting nuts 64.

[0035] When the pressure between the ground wheel 2 and the transmission wheel 21 is too high, the wear of the two is likely to increase. When the pressure between the two is too low, the transmission between the two is unstable. Therefore, the pressure between the two needs to be adjusted in time. However, the oil cylinder 7 cannot make fine adjustments, so an adjustment mechanism 6 is added for adjustment. When it is necessary to reduce the pressure between the ground wheel 2 and the transmission wheel 21, the first threaded rod 63 is moved toward the direction close to the transmission wheel 21, and when it reaches the appropriate position, the adjustment nuts 64 on both sides of the fixing plate 65 are tightened; similarly, when it is necessary to increase the pressure between the two, it is only necessary to move the first threaded rod 63 in the opposite direction and then tighten the adjustment nuts 64.

[0036] As a further illustration of this example, a connecting plate 81 is fixedly mounted on one end of the first mounting frame 12 away from the frame 1 , and a scraper plate 82 is mounted on one end of the connecting plate 81 away from the first mounting frame 12 .

[0037] Specifically, a second arc-shaped slide groove 84 is provided on the top of the connecting plate 81, and a second threaded rod 85 is slidably installed on the second slide groove 84. One end of the second threaded rod 85 is fixedly connected to the scraper plate 82, and the other end of the second threaded rod 85 is threadedly matched with a fixing nut 86; the bottom of the scraper plate 82 is hinged to the connecting plate 81 through a hinge shaft 83.

[0038] When the scraper blade 82 needs to be adjusted, it is only necessary to loosen the fixing nut 86 , rotate the scraper blade 82 to a suitable position, and then tighten the fixing nut 86 .

[0039] The operating principle of the device is as follows: first, the oil cylinder 7 is used to control the transmission wheel 21 to be in close contact with the ground wheel 2, and then the pressure between the ground wheel 2 and the transmission wheel 21 is adjusted by the adjustment mechanism 6, and finally the speed change sprocket 5 driven by the standard sprocket 3 is selected according to the required sowing rate.

[0040] In summary, the transmission mechanism for a seeder provided by the present invention transmits power through a standard sprocket 3 and a speed-changing sprocket 5 of different diameters, thereby changing the angular velocity of the output shaft 51, thereby changing the fertilization and sowing rates of the fertilization assembly and the sowing assembly which are transmission-connected to the output shaft 51, so that the device can cope with different lands, thereby increasing the applicability of the device and improving the utilization rate of the land; through the arrangement of a plurality of standard sprockets 3 and a tensioning sprocket 4, the speed-changing sprockets 5 are grouped to correspond to the standard sprocket 3 and the tensioning sprocket 4, thereby minimizing the bending degree of the second chain in the horizontal direction, thereby improving the service life of the second chain and further increasing the transmission stability of the device.

[0041] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A transmission mechanism for a seeder, comprising a frame (1), characterized in that, A ground wheel (2) is installed on the frame (1). A support frame is provided on the frame (1), and a driving wheel (21) is installed on the support frame. The ground wheel (2) can drive the driving wheel (21) to rotate through friction. A driven rotating shaft (25) is rotatably installed on the support frame, and the driven rotating shaft (25) is in transmission connection with the driving wheel (21). A standard sprocket (3) is fixedly installed on the driven rotating shaft (25). An output shaft (51) is installed on the support frame, and a number of variable-speed sprockets (5) with different diameters are fixedly installed on the output shaft (51). The standard sprocket (3) and any one of the variable-speed sprockets (5) can be in transmission connection through a second chain.

2. The transmission mechanism for a seeder according to claim 1, characterized in that, The driving wheel (21) is coaxially and fixedly installed with a driving sprocket (23). A driven sprocket (24) is fixedly installed on the driven rotating shaft (25). The driven sprocket (24) is in transmission connection with the driving sprocket (23) through a first chain.

3. The transmission mechanism for a seeder according to claim 2, characterized in that, The support frame includes mounting plates (11) fixedly installed on both sides of the frame (1). A tensioning sprocket (4) that can slide up and down is rotatably installed in the middle of the mounting plate (11). The tensioning sprocket (4) is located between the standard sprocket (3) and the variable-speed sprocket (5). The standard sprocket (3), any one of the variable-speed sprockets (5), and the tensioning sprocket (4) are in transmission through a second chain.

4. The transmission mechanism for a seeder according to claim 3, characterized in that, The tensioning sprocket (4) is coaxially and fixedly installed with a tensioning rotating shaft (41). Sliders (43) are rotatably installed at both ends of the tensioning rotating shaft (41). The sliders (43) are installed on the inner wall of the mounting plate (11) and can slide up and down.

5. The transmission mechanism for a seeding machine according to claim 4, characterized in that, A first chute (42) is provided on the inner wall of the mounting plate (11). The first chute (42) is in sliding fit with the slider (43). A tensioning spring (44) is fixedly installed at the bottom of the first chute (42). The top of the tensioning spring (44) is fixedly connected to the slider (43).

6. The transmission mechanism for a seeder according to claim 3, characterized in that, A first mounting frame (12) is installed between the ground wheel (2) and the frame (1). One end of the first mounting frame (12) is fixedly connected to the frame (1), and the other end of the first mounting frame (12) is rotatably connected to the ground wheel (2); A second mounting frame (13) is installed between the driving wheel (21) and the mounting plate (11). One end of the second mounting frame (13) is rotatably connected to the driven rotating shaft (25), and the other end of the second mounting frame (13) is rotatably connected to the driving wheel (21).

7. The transmission mechanism for a seeding machine according to claim 6, characterized in that, An oil cylinder (7) is also hinged on the first mounting frame (12). The output end of the oil cylinder (7) is hinged to the second mounting frame (13).

8. The transmission mechanism for a seeding machine according to claim 7, characterized in that, An adjusting mechanism (6) for adjusting the pressure between the ground wheel (2) and the driving wheel (21) is also installed between the second mounting frame (13) and the frame (1).

9. The transmission mechanism for a seeder according to claim 8, characterized in that, The adjusting mechanism (6) includes a fixing plate (65) fixedly installed on the frame (1). A first threaded rod (63) is slidably installed in the middle of the fixing plate (65). One end of the first threaded rod (63) close to the second mounting bracket (13) is fixedly installed with an adjusting plate (62). An adjusting spring (61) is fixedly installed on the adjusting plate (62). One end of the adjusting spring (61) away from the adjusting plate (62) is fixedly connected to the second mounting bracket (13). Two adjusting nuts (64) are also in threaded cooperation with the first threaded rod (63). The fixing plate (65) is located between the two adjusting nuts (64).

10. The transmission mechanism for a seeder according to claim 6, characterized in that, One end of the first mounting bracket (12) away from the frame (1) is also fixedly installed with a connecting plate (81). A mud scraping plate (82) is installed at one end of the connecting plate (81) away from the first mounting bracket (12). An arc-shaped second sliding groove (84) is provided at the top of the connecting plate (81). A second threaded rod (85) is slidably installed on the second sliding groove (84). One end of the second threaded rod (85) is fixedly connected to the mud scraping plate (82). The other end of the second threaded rod (85) is in threaded cooperation with a fixing nut (86). The bottom of the mud scraping plate (82) is hinged to the connecting plate (81) through a hinge shaft (83).

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