Crop topping machine

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a crop topping machine. Comprising a transmission case, a support fixedly installed on the transmission case and a transmission shaft rotatably installed on the support. The gear box comprises a gear box shell, a driving bevel gear and a driven bevel gear, the driving bevel gear is rotatably mounted on a side wall plate of the gear box shell through a bearing, the driven bevel gear is rotatably mounted on a bottom plate of the gear box shell through a bearing, and the driven bevel gear is constantly meshed with the driving bevel gear; the transmission shaft is inserted into the gearbox shell in a penetrating manner and is in transmission connection with the driving bevel gear 42; an output shaft is fixedly connected to the driven bevel gear and penetrates through a bottom plate of the gearbox shell, and a cutting knife is installed at the lower end of the output shaft. According to the crop topping machine, the distance between the tool bits can be flexibly adjusted, the tool bits can be controlled to rotate forwards and backwards for topping, the tool clamping phenomenon is avoided, and the crop topping machine is simple in structure, low in maintenance cost and good in fault tolerance performance.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a crop topping machine. Background Art

[0002] An important part of the field management of tall crops such as corn, sorghum, and cotton is topping the plants, pinching off the top of the crops to eliminate the top growth advantage, promote the development of crop lateral branches and fruits, and control lodging, which is of great significance to improving crop quality and yield. Traditional crop topping is done manually, which is labor-intensive and inefficient. Chinese patent application 2024101138578 discloses "A folding and lifting high-stalk crop topping machine and use method", including a frame assembly, a reel assembly, a cutting assembly, a lifting frame assembly and a hydraulic drive assembly, wherein the drive assembly adopts a hydraulic drive and the cutting assembly adopts a reciprocating shearing cutter head, which has a complex structure, a high failure rate, and poor fault tolerance. When encountering branches that cannot be cut, it is easy to get stuck and uproot the entire plant, causing losses. Utility Model Content

[0003] The utility model provides a crop topping machine with simple structure, low maintenance cost and good fault tolerance performance to solve the above problems.

[0004] The technical solution adopted by the utility model to solve the technical problem is:

[0005] The utility model discloses a crop topping machine, comprising a transmission box, a bracket fixedly mounted on the transmission box, a transmission shaft rotatably mounted on the bracket, a gear box mounted on the transmission shaft, the gear box comprising a gear box housing, a driving bevel gear rotatably mounted on a side wall plate of the gear box housing through a bearing, a driven bevel gear rotatably mounted on a bottom plate of the gear box housing through a bearing, the driven bevel gear is constantly meshed with the driving bevel gear, the transmission shaft is inserted through the gear box housing, and is transmission-connected with the driving bevel gear 42; an output shaft is fixedly connected to the driven bevel gear, the output shaft penetrates the bottom plate of the gear box housing, and a cutting knife is mounted on the lower end of the output shaft.

[0006] Through this solution, the topping machine will not have the problem of knife jamming, and has a simple structure, low maintenance cost and good fault tolerance.

[0007] Preferably, the transmission box includes a transmission box housing, a drive shaft rotatably inserted at the front end of the transmission box housing through a bearing, an active drive gear and a driven drive gear arranged in the transmission box housing, the transmission shaft passes through the transmission box and is arranged perpendicular to the drive shaft, the active drive gear and the driven drive gear are both bevel gears, the active drive gear is fixedly mounted on the drive shaft, and the driven drive gear is mounted on the transmission shaft.

[0008] Through this solution, the power output from the rear of the tractor can be transmitted to the transmission shaft through the transmission box.

[0009] Preferably, a sliding sleeve is axially movably mounted on the transmission shaft in the transmission box housing through a sliding key, the driven driving gear is fixedly mounted on the sliding sleeve, a shift fork is mounted on the sliding sleeve to push the sliding sleeve to move axially, and the outer end of the shift fork extends to the outside through the transmission box housing.

[0010] Through this solution, the driven drive gear can be controlled to engage or disengage with the active drive gear through the shift fork.

[0011] Preferably, the driven driving gear comprises two bevel gears mirror-imaged at both ends of the sliding sleeve.

[0012] Through this solution, the transmission shaft can be controlled to rotate forward and reversely by the shift fork to achieve bidirectional topping.

[0013] Preferably, the bracket includes at least two parallel cross beams and longitudinal beams fixedly connected to the two ends of the cross beams, an axially movable slide is installed on the cross beam, the transmission box and the gear box are both installed on the bracket through the slide, and hanging plates are rotatably installed at both ends of the transmission shaft, and the hanging plates are fixedly connected to the longitudinal beams.

[0014] Through this solution, the positions of the transmission box and the gear box on the bracket can be adjusted as needed.

[0015] Due to the adoption of the above structure, the crop topping machine can flexibly adjust the spacing between the cutter heads and can control the cutter heads to rotate in both directions in forward and reverse directions for topping without the occurrence of cutter jamming. It has a simple structure, low maintenance cost and good fault tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0017] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the transmission mechanism in the embodiment.

[0018] Figure 3 It is a three-dimensional structural diagram of the bracket and the transmission mechanism.

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the transmission case.

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the transmission box from another angle. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions away from the geometric center of a specific component.

[0022] like Figure 1 , Figure 2 As shown, the crop topping machine described in the utility model comprises a transmission box 1, a bracket 2 fixedly mounted on the transmission box 1, and a transmission shaft 3 rotatably mounted on the bracket 2.

[0023] like Figure 3 As shown, the bracket 2 includes at least two parallel crossbeams 21, and longitudinal beams 22 fixedly connected to the two ends of the crossbeams 21. The crossbeams 21 are provided with axially movable carriages 23. The carriages 23 are welded by sleeves 231 slidably mounted on the crossbeams 21 and end plates 232 arranged at the two ends of the sleeves 231. In order to lock the position of the carriage 23, a top screw 233 is threadedly mounted on the wall of the sleeve 231. When the top screw 233 is loosened, the carriage 23 can slide axially on the crossbeam 21. When the top screw 233 is tightened, the position of the carriage 23 can be fixed. Multiple carriages 23 are installed on the same bracket 2. The transmission box 1 and the gear box 4 are both installed on the bracket 2 through the carriages 23. The two ends of the transmission shaft 3 are rotatably provided with hanging plates 24, and the hanging plates 24 are fixedly connected to the longitudinal beams 22.

[0024] like Figure 2As shown, a gear box 4 is installed on the transmission shaft 3, and the gear box 4 includes a gear box housing 41, a driving bevel gear 42 rotatably mounted on the side wall plate of the gear box housing 41 through a bearing, and a driven bevel gear 43 rotatably mounted on the bottom plate of the gear box housing 41 through a bearing, and the driven bevel gear 43 is constantly meshed with the driving bevel gear 42. The upper end of the gear box 4 is fixedly connected to the slide 23 and can move with the slide 23; the transmission shaft 3 is inserted through the gear box housing 41 and is transmission-connected with the driving bevel gear 42. In order to prevent the driving bevel gear 42 from slipping on the transmission shaft 3, the transmission shaft 3 can adopt a polygonal columnar structure or an axially extending rib is provided on the outer wall of the transmission shaft 3. The shape of the mounting hole of the driving bevel gear 42 matches the cross-sectional shape of the transmission shaft 3, so that the driving bevel gear 42 can rotate with the transmission shaft 3 and can move along the axial direction of the transmission shaft 3 with the gear box 4. When the transmission shaft 3 rotates, the driven bevel gear 43 is driven to rotate through the active bevel gear 42; the driven bevel gear 43 is fixedly connected with an output shaft, the output shaft passes through the bottom plate of the gear box housing 41, and a cutter 5 is installed at the lower end of the output shaft. The cutter 5 is a plurality of strip blades evenly distributed around the output shaft. When the driven bevel gear 43 drives the output shaft to rotate, the cutter 5 makes a circular motion, and the top of the crop with the top higher than the cutter 5 can be cut off, which plays the role of topping. Of course, the number of gear boxes 4 and cutters 5 can be set in multiple groups according to the width of the topping machine.

[0025] like Figure 4 , Figure 5 As shown, the transmission box 1 includes a transmission box housing 11, a drive shaft 12 rotatably inserted at the front end of the transmission box housing 11 through a bearing, an active drive gear 13 and a driven drive gear 14 arranged in the transmission box housing 11, the transmission shaft 3 passes through the transmission box 1 and is arranged perpendicular to the drive shaft 12, the active drive gear 13 and the driven drive gear 14 are both bevel gears, the active drive gear 13 is fixedly mounted on the drive shaft 12, and the driven drive gear 14 is mounted on the transmission shaft 3. The function of the transmission box 1 is to transmit the rear power output of the tractor to the transmission shaft 3. When in use, the bracket 2 is connected to the rear suspension of the tractor, and the drive shaft 12 is connected to the rear power output shaft of the tractor through a coupling. When the drive shaft 12 rotates, the active drive gear 13 drives the driven drive gear 14 and the transmission shaft 3 to rotate, and the transmission shaft 3 drives the driven bevel gear 43 and the output shaft in the gear box 4 to rotate, thereby driving the cutter 5 to work.

[0026] As a further improvement of the present invention, the driven drive gear 14 can be constantly meshed with the active drive gear 13, and in this case, the driven drive gear 14 only needs to be fixedly connected to the transmission shaft 3; Figure 4As shown, a sleeve 15 is axially movably mounted on the transmission shaft 3 in the transmission box housing 11 through a sliding key, and the sleeve 15 can move axially on the transmission shaft 3 but cannot rotate relatively, and the driven driving gear 14 is fixedly mounted on the sleeve 15, and a fork 16 is mounted on the sleeve 15 to push the sleeve 15 to move axially, and the outer end of the fork 16 extends to the outside through the transmission box housing 11, and the axial movement of the sleeve 15 and the driven driving gear 14 is controlled by the fork 16 to achieve the purpose of engaging or disengaging with the active driving gear 13.

[0027] In addition, as a further improvement of the utility model, the driven drive gear 14 includes two bevel gears mirror-imaged at both ends of the sliding sleeve 15, and the length of the sliding sleeve 15 is such that at any time at least one of the two bevel gears is separated from the active drive gear 13. When one of the driven drive gears 14 is meshed with the active drive gear 13, the cutter 5 rotates forward, and when both driven drive gears 14 are separated, the cutter 5 stops working, and when the driven drive gear 14 at the other end is meshed with the active drive gear 13, the cutter 5 rotates reversely.

[0028] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A crop topping machine, comprising a transmission box (1), a bracket (2) fixedly mounted on the transmission box (1), and a transmission shaft (3) rotatably mounted on the bracket (2), characterized in that: The transmission shaft (3) is mounted with a gear box (4), the gear box (4) comprising a gear box housing (41), a driving bevel gear (42) rotatably mounted on a side wall plate of the gear box housing (41) via a bearing, and a driven bevel gear (43) rotatably mounted on a bottom plate of the gear box housing (41) via a bearing, the driven bevel gear (43) being constantly meshed with the driving bevel gear (42), the transmission shaft (3) being inserted through the gear box housing (41) and being transmission-connected with the driving bevel gear (42); an output shaft is fixedly connected to the driven bevel gear (43), the output shaft being mounted through the bottom plate of the gear box housing (41), and a cutting knife (5) being mounted at the lower end of the output shaft.

2. A crop topping machine according to claim 1, characterized in that: The transmission box (1) comprises a transmission box housing (11), a drive shaft (12) rotatably inserted into the front end of the transmission box housing (11) via a bearing, an active drive gear (13) and a driven drive gear (14) arranged in the transmission box housing (11), the transmission shaft (3) passes through the transmission box (1) and is arranged perpendicular to the drive shaft (12), the active drive gear (13) and the driven drive gear (14) are both bevel gears, the active drive gear (13) is fixedly mounted on the drive shaft (12), and the driven drive gear (14) is mounted on the transmission shaft (3).

3. A crop topping machine according to claim 2, characterized in that: A sliding sleeve (15) is mounted on the transmission shaft (3) in the transmission case housing (11) via a sliding key so as to be axially movable. The driven driving gear (14) is fixedly mounted on the sliding sleeve (15). A shift fork (16) is mounted on the sliding sleeve (15) for pushing the sliding sleeve (15) to move axially. The outer end of the shift fork (16) passes through the transmission case housing (11) and extends to the outside.

4. A crop topping machine according to claim 3, characterized in that: The driven driving gear (14) comprises two bevel gears which are arranged in mirror image at both ends of the sliding sleeve (15).

5. A crop topping machine according to claim 1, 2 or 3, characterized in that: The support (2) comprises at least two parallel transverse beams (21), and longitudinal beams (22) fixedly connected to the two ends of the transverse beams (21); an axially movable slide (23) is mounted on the transverse beam (21); the transmission box (1) and the gear box (4) are both mounted on the support (2) via the slide (23); and hanging plates (24) are rotatably mounted on the two ends of the transmission shaft (3); the hanging plates (24) are fixedly connected to the longitudinal beams (22).

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