Novel rotary tillage mechanism of farming machine

Abstract

The utility model discloses a novel rotary tillage mechanism of a farming machine, which comprises a rotary tillage mechanism 2. The rotary tillage mechanism 2 comprises a supporting connecting frame 21, a rotary knife motor 22 arranged on the supporting connecting frame 21, a transmission assembly 23 which is arranged in the middle of the supporting connecting frame 21 and is connected with the rotary knife motor 22 to transmit power, and a left side rotary knife 24 and a right side rotary knife 25 which are arranged on the two sides of the lower end of the transmission assembly 23, and the supporting connecting frame 21 is mounted on the buckling quick-mounting frame 4 of the tractor 1 in a buckling manner. A transmission assembly 23 is arranged in the middle of a rotary tillage mechanism 2 and transmits power of a rotary knife motor 22 to a left side rotary knife 24 and a right side rotary knife 25 from the middle of the rotary tillage mechanism 2 at the same time, so that the number of power sources and transmission modules can be reduced, the cost is reduced, the synchronism of the left side rotary knife 24 and the right side rotary knife 25 can be ensured, and the rotary tillage efficiency is improved. And fracture caused by internal stress is avoided.

Description

Technical Field:

[0001] The utility model relates to the field of agricultural machinery, specifically to a new rotary tillage mechanism of a farming machine. Background Art:

[0002] Currently, large agricultural tillage machines mainly consist of two parts: a locomotive and a tillage device. The locomotive generally uses a tractor driven by a diesel internal combustion engine. The tillage device is installed on the locomotive or towed by the locomotive to achieve operations in the farmland. With the continuous development of new energy technologies, currently, small and medium-sized farming machines on the market have gradually started to use electric tractors as the power devices of farming machines. Compared with traditional tractors, electric tractors not only save energy and are environmentally friendly, but also have the advantages of smaller volume, lower noise, lower maintenance costs, simple operation (can be unmanned), and high reliability, and are increasingly favored by the market.

[0003] Currently, farming machines using electric tractors on the market are usually in an unmanned mode and work by remotely operating the farming machine. For example, a kind of agricultural rotary tillage machine with the Chinese patent publication number of CN 114271046 A. This patent includes: a towing locomotive 1, a rotary tillage mechanism 2, a towing mechanism 30 for connecting the towing locomotive 1 and the rotary tillage mechanism 2, a flipping drive member 6, and a support mechanism 8. However, in this patent solution, since the cutter shaft 22 is directly driven by the rotary tillage motors 23 at both ends, it is necessary for the two rotary tillage motors 23 to maintain synchronization. Otherwise, torque will be generated on the cutter shaft 22, resulting in an increase in internal stress and easily causing the cutter shaft 22 to break during tillage. Especially during the speed change process of the cutter shaft 22, it is usually difficult for the two rotary tillage motors 23 to maintain synchronous speed change, resulting in different stress changes at both ends of the cutter shaft 22, easily causing increased wear and reduced service life. Moreover, since the rotary tillage machine works with soil flying, the belt drive assembly 24 directly linked to the cutter shaft 22 will often have soil falling into it during operation, causing the transmission mechanism to get stuck.

[0004] In view of this, the inventor of the present invention proposes the following technical solutions. Summary of the Utility Model:

[0005] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a new rotary tillage mechanism for a farming machine.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions: A new rotary tillage mechanism for a farming machine, including: a rotary tillage mechanism, which includes a support connection frame, a rotary cutter motor arranged on the support connection frame, a transmission component arranged in the middle of the support connection frame and connecting the rotary cutter motor to transmit power, and a left rotary cutter and a right rotary cutter installed on both sides of the lower end of the transmission component. Among them, the support connection frame is installed on the snap-fastening frame of the tractor in a snap-fastening manner.

[0007] Furthermore, in the above technical solution, the transmission assembly includes a driving shaft for installing the left-side rotary cutter and the right-side rotary cutter, an output bevel gear group sleeved on the driving shaft, a bevel gear shaft vertically arranged on one side of the driving shaft and located between the rotary cutter motor and the output bevel gear group, and a casing covering the bevel gear shaft and the output bevel gear group, wherein one end of the bevel gear shaft is meshed with the output bevel gear group, and the other end of the bevel gear shaft is connected to the output shaft of the rotary cutter motor.

[0008] Furthermore, in the above technical solution, a lifting bracket mechanism is provided on the tractor to support the fastening quick-install frame, and the fastening quick-install frame includes an upper support rod and a lower support rod for hanging the support connecting frame, and a left connecting plate and a right connecting plate which are sleeved on both ends of the upper support rod and the lower support rod and are used to be pivotally connected to the lifting bracket mechanism, and the left connecting plate and the right connecting plate are penetrated by a bolt group or a pin to be locked and fixed to the support connecting frame.

[0009] Furthermore, in the above technical solution, the upper end and the lower end of both sides of the support connecting frame are provided with an upper buckle groove and a lower buckle groove for hooking to the upper support rod and the lower support rod.

[0010] Furthermore, in the above technical solution, the left-side rotary cutter includes a cutter shaft mounted on a driving shaft, a plurality of rotary cutter frames fixed on the cutter shaft and arranged at intervals, and at least two arc-shaped blades mounted on the rotary cutter frames, and the right-side rotary cutter has the same structure as the left-side rotary cutter and is symmetrically mounted at both ends of the driving shaft.

[0011] Furthermore, in the above technical solution, the driving shaft and the knife shaft are both square shafts, and the knife shaft is sleeved onto the driving shaft and fixed by screws or pins.

[0012] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0013] 1. The utility model adopts a transmission assembly layout arranged in the middle of the rotary tillage mechanism, and the transmission assembly transmits the power of the rotary cutter motor to the left rotary cutter and the right rotary cutter from the middle of the rotary tillage mechanism at the same time. This not only reduces the number of power sources and transmission modules and reduces costs, but also ensures the synchronization of the left rotary cutter and the right rotary cutter to avoid internal stress that causes breakage.

[0014] 2. In the utility model, an upper support rod and a lower support rod are arranged on the fast-connecting quick-release frame to realize quick fastening with the support connecting frame of the rotary tillage mechanism, and the support connecting frame is penetrated together with the left connecting plate and the right connecting plate by a bolt group or a latch, so as to realize the locking and fixing of the rotary tillage mechanism and the fast-connecting quick-release frame. Description of the drawings:

[0015] Figure 1 It is a structural diagram of an embodiment of the utility model;

[0016] Figure 2 is the structural diagram of the present utility model;

[0017] Figure 3 is the internal structural diagram of the transmission component in the present utility model;

[0018] Figure 4 is the structural diagram of the transmission component in the present utility model;

[0019] Figure 5 is the structural diagram of the tractor in the present utility model;

[0020] Figure 6 is the structural diagram of the lifting bracket mechanism in the present utility model;

[0021] Figure 7 is the exploded view of the pull rod assembly in the present utility model;

[0022] Figure 8 is the structural diagram of the drive module in the embodiment of the present utility model;

[0023] Figure 9 is the internal structural diagram of the drive module in the embodiment of the present utility model;

[0024] Figure 10 is the structural diagram of the steering servo in the embodiment of the present utility model. Specific implementation manner:

[0025] The present utility model will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0026] See Figures 2 to 4 As shown, it is a new type of rotary tillage mechanism of an agricultural tillage machine, including a rotary tillage mechanism 2. The rotary tillage mechanism 2 includes a support connection frame 21, a rotary cutter motor 22 arranged on the support connection frame 21, a transmission component 23 arranged in the middle of the support connection frame 21 and connecting the rotary cutter motor 22 to transmit power, and a left rotary cutter 24 and a right rotary cutter 25 installed on both sides of the lower end of the transmission component 23. Among them, the support connection frame 21 is installed on the snap-fastening frame 4 of the tractor 1 in a snap-fastening manner. By arranging the transmission component 23 in the middle of the rotary tillage mechanism 2, the transmission component 23 transmits the power of the rotary cutter motor 22 to the left rotary cutter 24 and the right rotary cutter 25 simultaneously from the middle of the rotary tillage mechanism 2. This can not only reduce the number of power sources and transmission modules, lower the cost, but also ensure the synchronization of the left rotary cutter 24 and the right rotary cutter 25, and avoid the generation of internal stress leading to fracture.

[0027] The transmission assembly 23 includes a drive shaft 231 for mounting the left rotary cutter 24 and the right rotary cutter 25, an output bevel gear set 232 sleeved on the drive shaft 231, a bevel gear shaft 233 vertically arranged on one side of the drive shaft 231 and located between the rotary cutter motor 22 and the output bevel gear set 232, and a housing 234 covering the bevel gear shaft 233 and the output bevel gear set 232. One end of the bevel gear shaft 233 meshes with the output bevel gear set 232, and the other end of the bevel gear shaft 233 is connected to the output shaft of the rotary cutter motor 22.

[0028] A lifting bracket mechanism 3 is provided on the tractor 1 to support the snap-fastening frame 4. The snap-fastening frame 4 includes an upper support rod 41 and a lower support rod 42 for the support connection frame 21 to be hooked, and left and right connection plates 43 and 44 sleeved on both ends of the upper support rod 41 and the lower support rod 42 and used for pivoting connection with the lifting bracket mechanism 3. The support connection frame 21 is locked and fixed by bolts or pins passing through the left and right connection plates 43 and 44. Upper snap-fastening grooves 211 and lower snap-fastening grooves 212 for hooking onto the upper support rod 41 and the lower support rod 42 are provided at the upper and lower ends on both sides of the support connection frame 21. By using the upper snap-fastening grooves 211 and the lower snap-fastening grooves 212 provided on both sides of the support connection frame 21 and directly hooking onto the snap-fastening frame 4 through the upper snap-fastening grooves 211 and the lower snap-fastening grooves 212, the quick connection between the rotary tillage mechanism 2 and the tractor 1 is realized, and it is quickly locked by bolts or pins, thus completing the quick installation of the rotary tillage mechanism 2 onto the tractor 1.

[0029] The left rotary cutter 24 includes a cutter shaft 241 sleeved on the drive shaft 231, a plurality of rotary cutter frames 242 arranged at intervals and fixed on the cutter shaft 241, and at least two cutter blades 243 mounted on the rotary cutter frames 242 and bent in an arc shape. The right rotary cutter 25 has the same structure as the left rotary cutter 24 and is symmetrically installed at both ends of the drive shaft 231. Both the drive shaft 231 and the cutter shaft 241 are square shafts, and after the cutter shaft 241 is sleeved on the drive shaft 231, it is installed and fixed by screws or pins.

[0030] See Figures 1 to 10As shown, in one embodiment, a small multi-functional electric farming machine includes a tractor 1, a rotary tillage mechanism 2, and a lifting bracket mechanism 3 disposed at the rear end of the tractor 1 and used for lifting the rotary tillage mechanism 2. A snap-fastening mounting frame 4 for disassembling and assembling the rotary tillage mechanism 2 is provided on the lifting bracket mechanism 3. The rotary tillage mechanism 2 includes a support connection frame 21 for snap-fastening to the snap-fastening mounting frame 4, a rotary knife motor 22 disposed on the support connection frame 21, a transmission component 23 disposed in the middle of the support connection frame 21 and connected to the rotary knife motor 22 to transmit power, and a left rotary knife 24 and a right rotary knife 25 mounted on both sides of the lower end of the transmission component 23. The snap-fastening mounting frame 4 is used to achieve quick disassembly and assembly, thereby facilitating the replacement and maintenance of the rotary tillage mechanism 2, and enabling the quick replacement of agricultural mechanisms with different functions, such as a lawn mower, etc.

[0031] The snap-fastening mounting frame 4 includes an upper support rod 41 and a lower support rod 42 for the support connection frame 21 to snap-fasten to, and left connecting plates 43 and right connecting plates 44 sleeved on both ends of the upper support rod 41 and the lower support rod 42 and used for pivotally connecting to the lifting bracket mechanism 3. Upper snap-fastening grooves 211 and lower snap-fastening grooves 212 capable of snap-fastening to the upper support rod 41 and the lower support rod 42 are respectively provided at the upper and lower ends on both sides of the support connection frame 21, and are locked and fixed by passing a bolt group or a pin through the support connection frame 21 and the left connecting plates 43 and the right connecting plates 44. The upper support rod 41 and the lower support rod 42 are provided on the snap-fastening mounting frame 4 to achieve quick snap-fastening with the support connection frame 21 of the rotary tillage mechanism 2, and the support connection frame 21, the left connecting plates 43, and the right connecting plates 44 are threaded together by a bolt group or a pin to achieve locking and fixing of the rotary tillage mechanism 2 and the snap-fastening mounting frame 4.

[0032] Left support plates 213 and right support plates 214 for snap-fastening to the upper support rod 41 and the lower support rod 42 are provided on both sides of the support connection frame 21, and the upper snap-fastening grooves 211 and the lower snap-fastening grooves 212 are respectively located at the upper and lower ends of the left support plates 213 and the right support plates 214. First limit mounting holes 215 and second limit mounting holes 216 for a bolt group or a pin to pass through are respectively provided on the left support plates 213 and the right support plates 214, and both the first limit mounting holes 215 and the second limit mounting holes 216 are located between the upper snap-fastening grooves 211 and the lower snap-fastening grooves 212.

[0033] The transmission assembly 23 includes a drive shaft 231 for installing the left rotary cutter 24 and the right rotary cutter 25, an output bevel gear set 232 sleeved on the drive shaft 231, a bevel gear shaft 233 vertically arranged on one side of the drive shaft 231 and located between the rotary cutter motor 22 and the output bevel gear set 232, and a housing 234 covering the bevel gear shaft 233 and the output bevel gear set 232. One end of the bevel gear shaft 233 meshes with the output bevel gear set 232, and the other end of the bevel gear shaft 233 is connected to the output shaft of the rotary cutter motor 22.

[0034] The lifting bracket mechanism 3 includes four tie rod assemblies 31 arranged between the snap - on quick - mounting frame 4 and the tractor 1, a lifting lower connecting rod 32 hingedly installed on the snap - on quick - mounting frame 4, a lifting upper connecting rod 33 hingedly installed on the tractor 1 and movably hinged to the lifting lower connecting rod 32, and a driving push rod 34 hingedly installed on the tractor 1 and hinged to the lifting upper connecting rod 33 to push it to swing. Among them, the four tie rod assemblies 31 are respectively hinged at the four corners of the snap - on quick - mounting frame 4, and movable joints are provided at both ends of the tie rod assemblies 31. The four tie rod assemblies 31 connect the snap - on quick - mounting frame 4 and the tractor 4 together, and the lifting lower connecting rod 32 and the lifting upper connecting rod 33 hold the tractor 1 and the snap - on quick - mounting frame 4. By lifting or lowering the driving push rod 34 to lift or lower the lifting upper connecting rod 33, the snap - on quick - mounting frame 4 is lifted or lowered, so as to drive the rotary tillage mechanism 2 to flip, and the rotary tillage mechanism 2 is stably supported by the four tie rod assemblies 31. After lifting the rotary tillage mechanism 2, the distance between the rotary tillage mechanism 2 and the tractor 4 can be shortened, and the torque during swinging can be reduced, thus effectively avoiding vehicle overturning.

[0035] The pull rod assembly 31 includes a support sleeve 31A, a first fish-eye ball head 31B and a second fish-eye ball head 31C telescopically arranged at both ends of the support sleeve 31A, a first fixing bolt rod 31H for fixing the first fish-eye ball head 31B to the snap-fastening mounting bracket 4, a first fish-eye mounting sleeve 31D and a second fish-eye mounting sleeve 31E sleeved on the first fixing bolt rod 31H and pressing against both sides of the first fish-eye ball head 31B, a first fish-eye ball 31I arranged inside the end of the first fish-eye ball head 31B and used for mating and docking with the first fish-eye mounting sleeve 31D and the second fish-eye mounting sleeve 31E, a second fixing screw 31J for fixing the second fish-eye ball head 31C to the tractor 1, a third fish-eye mounting sleeve 31F and a fourth fish-eye mounting sleeve 31G sleeved on the second fixing screw 31J and pressing against both sides of the second fish-eye ball head 31C, and a second fish-eye ball 31K arranged inside the end of the second fish-eye ball head 31C and used for mating and docking with the third fish-eye mounting sleeve 31F and the fourth fish-eye mounting sleeve 31G. Among them, one end of the first fish-eye ball head 31B is set as a screw part 31B1 extending into the support sleeve 31A, and a first adjusting nut 31B2 for adjusting the telescopic length of the first fish-eye ball head 31B is installed on the screw part 31B1. The other end of the first fish-eye ball head 31B is set as a sleeve part 31B3 for installing the first fish-eye ball 31I and for the first fixing bolt rod 31H to pass through. The second fish-eye ball head 31C has the same structure as the first fish-eye ball head 31B. By setting fish-eye ball head structures at both ends of the pull rod assembly 31 for connection, through the cooperation of the fish-eye ball and the fish-eye mounting sleeve, the connection at the end of the pull rod assembly 31 can be deflected within a certain angle range, and the elongation and shortening of the pull rod assembly 31 are realized through the telescopable first fish-eye ball head 31B and second fish-eye ball head 31C, so as to realize the position adjustment of the rotary tillage mechanism 2, so that the rotary tillage mechanism 2 can keep working in a straight line and the tillage depth at each place is kept consistent.

[0036] The driving push rod 34 and the lifting upper connecting rod 33 are connected through a third fish-eye ball head 351, a third fixing bolt rod 352, a fifth fish-eye mounting sleeve 353 and a sixth fish-eye mounting sleeve 354. And a third fish-eye ball for the third fixing bolt rod 352 to pass through and mating and docking with the fifth fish-eye mounting sleeve 353 and the sixth fish-eye mounting sleeve 354 is also arranged inside the third fish-eye ball head 3351. The lifting lower connecting rod 32 and the lifting upper connecting rod 33 are connected through a first pin shaft 36, and a first strip-shaped groove 321 for the first pin shaft 36 to slide is arranged on the lifting lower connecting rod 32.

[0037] The tractor 1 includes a frame main body A, a left crawler wheel B and a right crawler wheel C arranged on both sides of the frame main body A, a drive module D arranged inside the frame main body A and used to drive the left crawler wheel B and the right crawler wheel C to work, and a battery unit E arranged inside the frame main body A and used to supply electric energy to the drive module D. Among them, the drive module D is located at the front end of the frame main body A, the lifting bracket mechanism 3 is hinged and installed at the rear end of the frame main body A, and the battery unit E is located in the middle of the frame main body A.

[0038] The drive module D includes a speed change gearbox D1, a steering servo D2 arranged on the speed change gearbox D1 and used to control the steering of the tractor 1, a shift servo D3 arranged on the speed change gearbox D1 and used to control the forward and backward movement of the tractor 1, a traveling motor D4 arranged on the speed change gearbox D1, and a transmission pulley group D5 arranged between the traveling motor D4 and the speed change gearbox D1.

[0039] An installation bracket D6 for supporting the traveling motor D4 and the transmission pulley group D5 is arranged on the speed change gearbox D1. The installation bracket D6 includes a support vertical plate D61 fixed on the speed change gearbox D1 and a sliding block D62 slidably arranged on the support vertical plate D61 and used to fix the traveling motor D4. One end of the support vertical plate D61 is provided with an installation groove D63 for the sliding block D62 to move, and a plurality of second strip-shaped grooves D64 for installing and adjusting the position of the sliding block D62 are arranged in the installation groove D63.

[0040] The steering servo D2 includes a servo gearbox, a servo rotor D22 arranged at the bottom of the servo gearbox D21 in a swingable manner, a steering motor D23 arranged on the servo gearbox D21 and used to drive the servo rotor D22 to swing, and a plurality of reduction gear pairs D24 arranged inside the servo gearbox D21 and used to transmit power between the steering motor D23 and the servo rotor D22.

[0041] The speed change gearbox D1 includes a box body, an input main shaft D12, a left output shaft D13, a right output shaft D14, a speed change main shaft D15 and a clutch main shaft D16. Among them, a speed change gear group D17 for transmitting power is arranged on the input main shaft D12 and the speed change main shaft D15, a clutch gear group D18 for transmitting power is arranged on the clutch main shaft D16 and the left output shaft D13 and the right output shaft D14, and left and right clutch modules D19 and D100 capable of contacting and pressing against the servo rotor D22 are respectively arranged at both ends of the clutch main shaft D16.

[0042] In summary, when the utility model works, the tractor 1 drives the rotary tillage mechanism 2 to move. When tilling is required, the rotary tillage mechanism 2 is lowered through the lifting bracket mechanism 3, so that the left rotary cutter group 24 and the right rotary cutter group 25 of the rotary tillage mechanism 2 are inserted into the soil. Driven by the rotary cutter motor 22, the left rotary cutter group 24 and the right rotary cutter group 25 start to work, and at the same time, the tractor 1 pulls the rotary tillage mechanism 2 forward, thus realizing tilling. Further, when replacing the agricultural mechanism, for example, a weeding machine, it is necessary to first lift the rotary tillage mechanism 2 through the lifting bracket mechanism 3, loosen the bolts or pins between the rotary tillage mechanism 2 and the snap-fastening mounting frame 4, and then manually or with the help of a crane lift the rotary tillage mechanism 2 upward and remove it from the snap-fastening mounting frame 4. Of course, in order to facilitate the removal of the rotary tillage mechanism 2, the rotary tillage mechanism 2 can also be pulled out of the soil and placed on the ground. After removing the locking bolts or pins, it swings downward through the lifting bracket mechanism 3 and disengages from the rotary tillage mechanism 2. Finally, the weeding machine is installed on the snap-fastening mounting frame 4 to complete the replacement of the agricultural mechanism.

[0043] Certainly, the above are only specific embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model. Any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present utility model shall be included in the scope of the patent application of the present utility model.

Claims

1. A new rotary tillage mechanism for an agricultural tiller, comprising a rotary tillage mechanism (2), characterized in that: The rotary tillage mechanism (2) includes a support connection frame (21), a rotary cutter motor (22) arranged on the support connection frame (21), a transmission component (23) arranged in the middle of the support connection frame (21) and connecting the rotary cutter motor (22) to transmit power, and a left rotary cutter (24) and a right rotary cutter (25) installed on both sides of the lower end of the transmission component (23). Among them, the support connection frame (21) is installed on the snap-fastening frame (4) of the tractor (1) in a snap-fastening manner.

2. The novel rotary tillage mechanism of a farming machine according to claim 1, characterized in that: The transmission component (23) includes a drive shaft (231) for installing the left rotary cutter (24) and the right rotary cutter (25), an output bevel gear set (232) sleeved on the drive shaft (231), a bevel gear shaft (233) vertically arranged on one side of the drive shaft (231) and located between the rotary cutter motor (22) and the output bevel gear set (232), and a machine shell (234) covering the bevel gear shaft (233) and the output bevel gear set (232). Among them, one end of the bevel gear shaft (233) meshes with the output bevel gear set (232), and the other end of the bevel gear shaft (233) is connected to the output shaft of the rotary cutter motor (22).

3. The novel rotary tillage mechanism of a farming machine according to claim 1, characterized in that: A lifting bracket mechanism (3) is arranged on the tractor (1) to support the snap-fastening frame (4). The snap-fastening frame (4) includes an upper support rod (41) and a lower support rod (42) for the support connection frame (21) to snap-fasten, and left and right connecting plates (43) and (44) sleeved on both ends of the upper support rod (41) and the lower support rod (42) and used for pivoting connection with the lifting bracket mechanism (3). And it is locked and fixed to the support connection frame (21) by bolts or pins passing through the left and right connecting plates (43) and (44).

4. A novel rotary tillage mechanism for a farming machine according to claim 3, characterized in that: Upper snap-fastening grooves (211) and lower snap-fastening grooves (212) for snap-fastening to the upper support rod (41) and the lower support rod (42) are arranged at both the upper and lower ends on both sides of the support connection frame (21).

5. The novel rotary tillage mechanism of a farming machine according to claim 2, characterized in that: The left rotary cutter (24) includes a cutter shaft (241) sleeved on the drive shaft (231), a plurality of rotary cutter frames (242) fixedly arranged on the cutter shaft (241) at intervals, and at least two cutter blades (243) installed on the rotary cutter frame (242) and bent in an arc shape. And the right rotary cutter (25) has the same structure as the left rotary cutter (24) and is symmetrically installed at both ends of the drive shaft (231).

6. The novel rotary tillage mechanism of a farming machine according to claim 5, characterized in that: Both the drive shaft (231) and the cutter shaft (241) are square shafts, and after the cutter shaft (241) is sleeved on the drive shaft (231), it is installed and fixed by screws or pins.

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