Small multi-functional electric agricultural machinery

Abstract

A small multi-functional electric agricultural machine is disclosed, which includes a towing vehicle, a rotary tillage mechanism, and a lifting bracket mechanism installed at the rear end of the towing vehicle for raising and lowering the rotary tillage mechanism. A quick-attachment frame for attaching and detaching the rotary tillage mechanism is installed on the lifting bracket mechanism. The rotary tillage mechanism includes a support connection frame for engaging with the quick-attachment frame, a rotary cutter motor installed on the support connection frame, a transmission assembly installed in the middle of the support connection frame and connected to the rotary cutter motor to transmit power, and a left rotary cutter and a right rotary cutter attached to either side of the lower end of the transmission assembly. [Effect] By installing a quick-engagement frame between the lifting bracket mechanism and the rotary tillage mechanism, quick attachment and detachment is achieved, which facilitates replacement and maintenance of the rotary tillage mechanism and enables quick replacement of agricultural mechanisms with different functions, such as lawn mowers.

Description

[Technical Field]

[0001] The present invention relates to the field of agricultural machinery, and in particular to small, multi-functional electric agricultural machinery. [Background technology]

[0002] Currently, large agricultural tillage machinery is mainly composed of two parts: a locomotive and a tillage implement. The locomotive is generally a tractor driven by a diesel internal combustion engine, and the tillage implement is mounted on the locomotive or pulled by the locomotive to carry out work in the field. With the continuous development of new energy technology, small and medium-sized agricultural machinery currently on the market is increasingly adopting electric tractors as its power source. Compared with traditional tractors, electric tractors are not only energy-saving and environmentally friendly, but also have the advantages of small volume, low noise, low maintenance costs, easy operation (unmanned operation possible), and high reliability, and are therefore increasingly popular in the market.

[0003] Currently, agricultural machinery on the market that uses electric traction vehicles is generally in unmanned operation mode, allowing the agricultural machinery to be operated by controlling it from a distance, such as the agricultural rotary tiller with Chinese patent registration number CN114271046A, which includes a traction locomotive 1, a rotary tillage mechanism 2, a traction mechanism 30 for connecting the traction locomotive 1 and the rotary tillage mechanism 2, a reversing drive member 6, and a support mechanism 8, but the solution of this patent has the following deficiencies:

[0004] 1. The rotary tillage mechanism 2 is fixed to the traction locomotive 1 by the traction mechanism 30, but the traction mechanism 30 is fastened using bolts, making it difficult to attach and detach, and the rotary tillage mechanism 2 cannot be quickly replaced or maintained, resulting in poor versatility.

[0005] 2. Because the cutter shaft 22 is directly driven by the rotary tillage motors 23 at both ends, it is necessary to maintain synchronization between the two rotary tillage motors 23; otherwise, torque will be generated on the cutter shaft 22, causing increased internal stress and making it easy for the cutter shaft 22 to break during tilling. In particular, because it is difficult to maintain synchronous speed changes between the two rotary tillage motors 23 when the cutter shaft 22 is changing speed, the ends of the cutter shaft 22 are subjected to different stress changes, which is easy to cause increased wear and a shortened service life. Furthermore, when the rotary tiller is operating, mud is splashed up, and when the belt transmission assembly 24, which is directly connected to the cutter shaft 22, operates, mud often gets into it, leading to the transmission mechanism sticking.

[0006] 3. Because the traction mechanism 30 does not have sufficient support, when the entire agricultural machine is traveling or retracted, unevenness in the ground can cause the rotary tillage mechanism to oscillate from side to side, making it impossible to maintain balance. If the oscillation becomes too large, it may even cause the vehicle to tip over.

[0007] 4. Two traction motors 11 are used to drive the crawler drive wheels on the left and right sides respectively to operate and drive the locomotive body 10, and the movement and steering of the entire locomotive body 10 are controlled by controlling the output of the two traction motors 11 on the left and right. As a result, whether the agricultural machinery is moving forward or steering, the two traction motors 11 are always in operation, which not only increases energy consumption and affects the cruising capacity of the battery of the agricultural machinery, but also causes the motors to overheat as they operate continuously for long periods of time, affecting their service life. In addition, if it is necessary to maintain straight-line running of the agricultural machinery, it is necessary to ensure that the crawler transmission mechanisms on both sides are fully synchronized, otherwise misalignment will occur.

[0008] In view of this, the present inventors propose the following technical proposal. Summary of the Invention [Problem to be solved by the invention]

[0009] SUMMARY OF THE INVENTION An object of the present invention is to provide a small, multi-functional electric farm machine that overcomes the shortcomings of the prior art. [Means for solving the problem]

[0010] In order to solve the above technical problems, the present invention employs the following technical solution: a small-sized multi-functional electric agricultural machine, comprising: a towing vehicle, a rotary tillage mechanism, and a lifting bracket mechanism installed at the rear end of the towing vehicle for raising and lowering the rotary tillage mechanism, a quick-connect frame for attaching and detaching the rotary tillage mechanism is installed on the lifting bracket mechanism, the rotary tillage mechanism includes a support connection frame for engaging with the quick-connect frame, a rotary cutter motor installed on the support connection frame, a transmission assembly installed in the middle of the support connection frame and connected to the rotary cutter motor to transmit power, and a left rotary cutter and a right rotary cutter attached to either side of the lower end of the transmission assembly.

[0011] Furthermore, in the above technical solution, the quick-fit engagement frame includes upper and lower support rods for engaging with the support connection frame, and left and right connection plates fitted onto both ends of the upper and lower support rods and pivotally connected to the lifting bracket mechanism. Upper and lower engagement grooves that can engage with the upper and lower support rods are respectively installed at the upper and lower ends of both sides of the support connection frame, and bolt sets or insert pins are passed through the support connection frame and fastened to the left and right connection plates.

[0012] Furthermore, in the above technical solution, the transmission assembly includes a drive shaft for mounting the left and right rotary cutters, an output cone tooth group fitted onto the drive shaft, a cone tooth shaft installed vertically on one side of the drive shaft and positioned between the rotary cutter motor and the output cone tooth group, and a case covering the cone tooth shaft and the output cone tooth group, wherein one end of the cone tooth shaft engages with the output cone tooth group and the other end of the cone tooth shaft is connected to the output shaft of the rotary cutter motor.

[0013] Furthermore, in the above technical solution, the lifting bracket mechanism includes four pull rod assemblies installed between the engagement quick attachment frame and the towing vehicle, a lower lifting link hingedly mounted on the engagement quick attachment frame, an upper lifting link hingedly mounted on the towing vehicle and movably hingedly connected to the lower lifting link, and a driving push rod hingedly mounted on the towing vehicle and hingedly connected to the upper lifting link for pushing and swinging it, wherein the four pull rod assemblies are respectively hingedly connected to the four corners of the engagement quick attachment frame.

[0014] Furthermore, in the above technical solution, the pull rod assembly includes a support sleeve, a first fisheye ball joint and a second fisheye ball joint telescopically installed on both ends of the support sleeve, a first fixing bolt screw for fixing the first fisheye ball joint to the engagement quick-fit frame, a first fisheye mounting bush and a second fisheye mounting bush fitted onto the first fixing bolt screw and pressed against both sides of the first fisheye ball joint, a first fisheye ball installed within the end of the first fisheye ball joint and mating with the first fisheye mounting bush and the second fisheye mounting bush, a second fixing screw for fixing the second fisheye ball joint to the towing vehicle, a third fisheye mounting bush and a fourth fisheye mounting bush fitted onto the second fixing screw and pressed against both sides of the second fisheye ball joint, and a second fisheye ball installed within the end of the second fisheye ball joint and mating with the third fisheye mounting bush and the fourth fisheye mounting bush.

[0015] Furthermore, in the above technical solution, the towing vehicle includes a chassis body, left and right crawlers installed on both sides of the chassis body, a drive module installed in the chassis body for operating the left and right crawlers, and a battery unit installed in the chassis body for providing electrical energy to the drive module, wherein the drive module is located at the front end of the chassis body, the lifting bracket mechanism is hingedly attached to the rear end of the chassis body, and the battery unit is located in the middle of the chassis body.

[0016] Furthermore, in the above technical solution, the driving module includes a speed-change gearbox, a steering gear installed on the speed-change gearbox for controlling the steering of the towing vehicle, a gear change steering gear installed on the speed-change gearbox for controlling the forward and backward movement of the towing vehicle, a traction motor installed on the speed-change gearbox, and a transmission pulley set installed between the traction motor and the speed-change gearbox.

[0017] Furthermore, in the above technical solution, a mounting holder for supporting the traveling motor and the transmission pulley set is installed on the speed-changing gearbox, and this mounting holder includes a support stand fixed on the speed-changing gearbox and a slide block slidably installed on the support stand for fixing the traveling motor, and a mounting groove for accommodating the movement of the slide block is installed on one end of the support stand, and a plurality of second elongated grooves are installed in the mounting groove for installing and adjusting the position of the slide block.

[0018] Furthermore, in the above technical solution, the steering gear includes a steering gear box, a steering gear rotor oscillatingly installed at the bottom of the steering gear box, a steering motor installed on the steering gear box for driving the steering gear rotor to oscillate, and a plurality of sets of reduction worm gear pairs installed in the steering gear box for transmitting power between the steering motor and the steering gear rotor.

[0019]

[0013] Furthermore, in the above technical solution, the speed-changing gearbox includes a box body, an input shaft, a left output shaft, a right output shaft, a speed-changing shaft, and a clutch shaft, wherein a speed-changing gear train for transmitting power is installed on the input shaft and the speed-changing shaft, a clutch gear train for transmitting power is installed on the clutch shaft and the left output shaft and the right output shaft, and a left clutch module and a right clutch module are respectively installed on both ends of the clutch shaft, which can contact and press against the steering gear rotor. [Effects of the Invention]

[0020] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. In the present invention, a quick-attach frame is installed between the lifting bracket mechanism and the rotary tillage mechanism to enable quick attachment and detachment, thereby facilitating replacement and maintenance of the rotary tillage mechanism and enabling quick replacement of agricultural mechanisms with different functions, such as lawn mowers. Second, the rotary tillage mechanism uses a middle transmission assembly to simultaneously transmit the power of the rotary cutter motor to the left and right rotary cutters, ensuring the synchronization of the left and right rotary cutters and avoiding fractures caused by internal stress.

[0022] 2. In the present invention, upper and lower support rods are installed on the quick-fitting frame to quickly engage with the support connection frame of the rotary tillage mechanism, and a bolt set or an insertion pin is used to penetrate and integrate the support connection frame with the left and right connection plates, thereby fastening and fixing the rotary tillage mechanism to the quick-fitting frame. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a structural diagram of the present invention. [Figure 2] 1 is a structural diagram of a rotary tilling mechanism according to the present invention; [Figure 3] 1 is a diagram showing the internal structure of a transmission assembly according to the present invention; [Figure 4] FIG. 2 is a structural diagram of a transmission assembly according to the present invention. [Figure 5] 1 is a structural diagram of a towing vehicle according to the present invention; [Figure 6] FIG. 2 is a structural diagram of a lifting bracket mechanism according to the present invention. [Figure 7] FIG. 2 is an exploded view of the pull rod assembly of the present invention. [Figure 8] FIG. 2 is a structural diagram of a driving module according to the present invention. [Figure 9] FIG. 2 is a diagram showing the internal structure of a drive module according to the present invention. [Figure 10] 1 is a structural diagram of a steering gear according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be further described below in conjunction with specific examples and drawings.

[0025] As shown in Figures 1 to 10, this is a small, multi-functional electric agricultural machine that includes a towing vehicle 1, a rotary tillage mechanism 2, and a lifting bracket mechanism 3 mounted on the rear end of the towing vehicle 1 for raising and lowering the rotary tillage mechanism 2. A quick-attachment frame 4 for attaching and detaching the rotary tillage mechanism 2 is mounted on the lifting bracket mechanism 3. The rotary tillage mechanism 2 includes a support connection frame 21 for engaging with the quick-attachment frame 4, a rotary cutter motor 22 mounted on the support connection frame 21, a transmission assembly 23 mounted in the middle of the support connection frame 21 and connected to the rotary cutter motor 22 to transmit power, and a left rotary cutter 24 and a right rotary cutter 25 mounted on both sides of the lower end of the transmission assembly 23. The quick-attachment frame 4 is mounted between the lifting bracket mechanism 3 and the rotary tillage mechanism 2 to enable quick attachment and detachment, facilitating replacement and maintenance of the rotary tillage mechanism 2 and enabling the rapid replacement of agricultural mechanisms with different functions, such as mowers. Next, the rotary tillage mechanism 2 uses a central transmission assembly 23 to simultaneously transmit the power of the rotary cutter motor 22 to the left rotary cutter 24 and the right rotary cutter 25, thereby ensuring synchronization between the left rotary cutter 24 and the right rotary cutter 25 and avoiding fractures caused by internal stress.

[0026] The quick-connect frame 4 includes upper and lower support rods 41 and 42 for engaging with the support connection frame 21, and left and right connection plates 43 and 44 fitted onto both ends of the upper and lower support rods 41 and 42 for pivotally connecting to the lifting bracket mechanism 3. Upper and lower engagement grooves 211 and 212 that can engage with the upper and lower support rods 41 and 42 are respectively provided at the upper and lower ends of both sides of the support connection frame 21, and are fastened to the left and right connection plates 43 and 44 by bolt sets or insert pins that pass through the support connection frame 21. The upper and lower support rods 41 and 42 are installed on the quick-connect frame 4 to enable quick engagement between the support connection frame 21 of the rotary tillage mechanism 2, and the support connection frame 21 and the left and right connection plates 43 and 44 are passed through and integrated by bolt sets or insert pins, thereby fastening the rotary tillage mechanism 2 to the quick-connect frame 4.

[0027] A left support plate 213 and a right support plate 214 are provided on both sides of the support connection frame 21 to engage with the upper support rod 41 and the lower support rod 42, and an upper engagement groove 211 and a lower engagement groove 212 are located at the upper and lower ends of the left support plate 213 and the right support plate 214, respectively. A first position limiting mounting hole 215 and a second position limiting mounting hole 216 are further provided on the left support plate 213 and the right support plate 214, respectively, for passing a bolt set or an insert pin therethrough, and the first position limiting mounting hole 215 and the second position limiting mounting hole 216 are both located between the upper engagement groove 211 and the lower engagement groove 212.

[0028] The transmission assembly 23 includes a drive shaft 231 for mounting the left rotary cutter 24 and the right rotary cutter 25, an output cone tooth group 232 fitted onto the drive shaft 231, a cone tooth shaft 233 installed vertically on one side of the drive shaft 231 and positioned between the rotary cutter motor 22 and the output cone tooth group 232, and a case 234 covering the cone tooth shaft 233 and the output cone tooth group 232, wherein one end of the cone tooth shaft 233 engages with the output cone tooth group 232 and the other end of the cone tooth shaft 233 is connected to the output shaft of the rotary cutter motor 22.

[0029] The lifting bracket mechanism 3 includes four pull rod assemblies 31 installed between the engagement quick attachment frame 4 and the towing vehicle 1, a lower lifting link 32 hingedly mounted on the engagement quick attachment frame 4, an upper lifting link 33 hingedly mounted on the towing vehicle 1 and movably hingedly connected to the lower lifting link 32, and a driving push rod 34 hingedly mounted on the towing vehicle 1 and hingedly connected to the upper lifting link 33 for pushing and swinging it, where the four pull rod assemblies 31 are hingedly connected to the four corners of the engagement quick attachment frame 4 respectively, and movable nodes are installed at both ends of the pull rod assembly 31. Four pull rod assemblies 31 are used to connect and integrate the quick-attach frame 4 and the towing vehicle 1, and the lower lifting link 32 and upper lifting link 33 hold the towing vehicle 1 and the quick-attach frame 4 together. The drive push rod 34 pushes up or down the upper lifting link 33, raising or lowering the quick-attach frame 4 to invert the rotary tillage mechanism 2. The four pull rod assemblies 31 provide stable support for the rotary tillage mechanism 2, and after the rotary tillage mechanism 2 is raised, the distance between the rotary tillage mechanism 2 and the towing vehicle 1 is shortened, reducing the moment during swinging and effectively preventing the vehicle from tipping over.

[0030] The pull rod assembly 31 includes a support sleeve 31A, a first fisheye ball joint 31B and a second fisheye ball joint 31C telescopically mounted on both ends of the support sleeve 31A, a first fixing bolt screw 31H for fixing the first fisheye ball joint 31B to the engagement quick-fit frame 4, a first fisheye mounting bush 31D and a second fisheye mounting bush 31E fitted onto the first fixing bolt screw 31H and pressed against both sides of the first fisheye ball joint 31B, and a first fisheye mounting bush 31D and a second fisheye mounting bush 31E mounted within the end of the first fisheye ball joint 31B. The second fisheye ball joint 31C includes a first fisheye ball 31I for matching and abutting with the second fisheye mounting bush 31E and the second fisheye ball joint 31D, a second fixing screw 31J for fixing the second fisheye ball joint 31C to the towing vehicle 1, a third fisheye mounting bush 31F and a fourth fisheye mounting bush 31G fitted onto the second fixing screw 31J and pressed against both sides of the second fisheye ball joint 31C, and a second fisheye ball 31K installed within the end of the second fisheye ball joint 31C for matching and abutting with the third fisheye mounting bush 31F and the fourth fisheye mounting bush 31G. Here, one end of the first fisheye ball joint 31B is installed as a screw portion 31B1 that is inserted into the support sleeve 31A, and a first adjustment nut 31B2 for adjusting the extension length of the first fisheye ball joint 31B is attached to the screw portion 31B1. The other end of the first fisheye ball joint 31B is installed as a sleeve portion 31B3 for attaching the first fisheye ball 31I and for passing through the first fixing bolt screw 31H. The second fisheye ball joint 31C and the first fisheye ball joint 31B have the same structure.A fisheye ball joint structure is installed at both ends of the pull rod assembly 31 to make the connection, and by fitting the fisheye ball with the fisheye mounting bush, the connection point at the end of the pull rod assembly 31 can be swung within a certain angle range.The extendable first fisheye ball joint 31B and second fisheye ball joint 31C allow the pull rod assembly 31 to be extended and shortened, thereby enabling position adjustment relative to the rotary tillage mechanism 2, allowing the rotary tillage mechanism 2 to maintain linear operation and maintaining the tillage depth at each point to be consistent.

[0031] The driving push rod 34 and the lifting upper link 33 are connected via a third fisheye ball joint 351, a third fixing bolt screw 352, a fifth fisheye mounting bush 353 and a sixth fisheye mounting bush 354. A third fisheye ball is installed in the third fisheye ball joint 3351, through which the third fixing bolt screw 352 passes, and which matches and abuts with the fifth fisheye mounting bush 353 and the sixth fisheye mounting bush 354. The lifting lower link 32 and the lifting upper link 33 are connected via a first pin shaft 36. A first elongated groove 321 is installed on the lifting lower link 32, through which the first pin shaft 36 slides.

[0032] The towing vehicle 1 includes a chassis body A, a left crawler B and a right crawler C installed on both sides of the chassis body A, a drive module D installed within the chassis body A for operating the left crawler B and the right crawler C, and a battery unit E installed within the chassis body A for providing electrical energy to the drive module D, wherein the drive module D is located at the front end of the chassis body A, a lifting bracket mechanism 3 is hingedly attached to the rear end of the chassis body A, and the battery unit E is located in the middle of the chassis body A.

[0033] The drive module D includes a speed-change gearbox D1, a steering gear D2 installed on the speed-change gearbox D1 for controlling the steering of the towing vehicle 1, a gear change steering gear D3 installed on the speed-change gearbox D1 for controlling the forward and backward movement of the towing vehicle 1, a traveling motor D4 installed on the speed-change gearbox D1, and a transmission pulley set D5 installed between the traveling motor D4 and the speed-change gearbox D1.

[0034] An attachment holder D6 for supporting the traveling motor D4 and the transmission pulley set D5 is installed on the speed-changing gearbox D1. This attachment holder D6 includes a support stand D61 fixed on the speed-changing gearbox D1, and a slide block D62 slidably installed on the support stand D61 for fixing the traveling motor D4. One end of the support stand D61 is provided with an attachment groove D63 for accommodating the movement of the slide block D62, and a plurality of second elongated grooves D64 for attaching and adjusting the position of the slide block D62 are provided in the attachment groove D63.

[0035] The steering gear D2 includes a steering gear box D21, a steering gear rotor D22 swingably installed at the bottom of the steering gear box D21, a steering motor D23 installed on the steering gear box D21 for driving the steering gear rotor D22 to swing, and a plurality of sets of reduction worm gear pairs D24 installed in the steering gear box D21 for transmitting power between the steering motor D23 and the steering gear rotor D22.

[0036] The speed-changing gearbox D1 includes a box body, an input shaft D12, a left output shaft D13, a right output shaft D14, a speed-changing shaft D15, and a clutch shaft D16, wherein a speed-changing gear train D17 for transmitting power is installed on the input shaft D12 and the speed-changing shaft D15, a clutch gear train D18 for transmitting power is installed on the clutch shaft D16, the left output shaft D13, and the right output shaft D14, and a left clutch module D19 and a right clutch module D100 are installed on both ends of the clutch shaft D16, respectively, which can contact and press against the steering gear rotor D22.

[0037] To summarize the above, when the present invention is in operation, the rotary tillage mechanism 2 is driven by the towing vehicle 1, and when it is necessary to till a field, the rotary tillage mechanism 2 is lowered by the lifting bracket mechanism 3, and the left rotary cutter set 24 and right rotary cutter set 25 of the rotary tillage mechanism 2 are inserted underground, and under the drive of the rotary cutter motor 22, the left rotary cutter set 24 and right rotary cutter set 25 begin to operate, and at the same time, the rotary tillage mechanism 2 is pulled forward by the towing vehicle 1, thereby achieving tillage. Furthermore, when it is necessary to replace an agricultural mechanism, such as a weeder, the rotary tillage mechanism 2 must first be raised using the lifting bracket mechanism 3, the bolts or insertion pins between the rotary tillage mechanism 2 and the quick-connect frame 4 must be loosened, and then the rotary tillage mechanism 2 must be lifted upward by hand or with an auxiliary crane and removed from the quick-connect frame 4. Of course, to make it easier to remove the rotary tillage mechanism 2, the rotary tillage mechanism 2 can be removed from the ground after being pulled out from underground, the fastening bolts or insertion pins must be removed, and the lifting bracket mechanism 3 can be swung downward to remove the rotary tillage mechanism 2. Finally, the weeder must be attached to the quick-connect frame 4, completing the replacement of the agricultural mechanism.

[0038] Of course, the above description is merely a specific example of the present invention and does not limit the scope of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the claims of the present invention should be included in the claims of the present invention.

Claims

1. A small-sized multifunctional electric agricultural machine including a towing vehicle (1), a rotary tillage mechanism (2), and a lifting bracket mechanism (3) installed at the rear end of the towing vehicle (1) for lifting and lowering the rotary tillage mechanism (2), A quick-attachment frame (4) for attaching and detaching the rotary tillage mechanism (2) is installed on the lifting bracket mechanism (3); The rotary tilling mechanism (2) includes a support connection frame (21) for engaging on the engagement quick-mounting frame (4), a rotary cutter motor (22) installed on the support connection frame (21), a transmission assembly (23) installed in the middle of the support connection frame (21) and connected to the rotary cutter motor (22) to transmit power, and a left rotary cutter (24) and a right rotary cutter (25) attached to both sides of the lower end of the transmission assembly (23). The quick-fitting engagement frame (4) includes upper and lower support rods (41 and 42) for engaging with the support connection frame (21), and left and right connection plates (43 and 44) ​​fitted onto both ends of the upper and lower support rods (41 and 42) for pivotal connection to the lifting bracket mechanism (3). The upper and lower ends of both sides of the support connection frame (21) are provided with upper and lower engagement grooves (211 and 212) that can be engaged with the upper and lower support rods (41 and 42), respectively. The bolt sets or insert pins are fastened to the left and right connection plates (43 and 44) ​​through the support connection frame (21). The small multi-functional electric agricultural machine is characterized by the above.

2. 2. The compact multi-functional electric agricultural machine according to claim 1, wherein the transmission assembly (23) includes a drive shaft (231) for mounting the left rotary cutter (24) and the right rotary cutter (25), an output drill bit set (232) fitted onto the drive shaft (231), a drill bit shaft (233) installed vertically on one side of the drive shaft (231) and positioned between the rotary cutter motor (22) and the output drill bit set (232), and a case (234) covering the drill bit shaft (233) and the output drill bit set (232), wherein one end of the drill bit shaft (233) engages with the output drill bit set (232) and the other end of the drill bit shaft (233) is connected to the output shaft of the rotary cutter motor (22).

3. 2. The compact multifunctional electric agricultural machine according to claim 1, wherein the lifting bracket mechanism (3) includes four pull rod assemblies (31) installed between the engagement quick-attach frame (4) and the towing vehicle (1), a lifting lower link (32) hingedly mounted on the engagement quick-attach frame (4), a lifting upper link (33) hingedly mounted on the towing vehicle (1) and movably hingedly connected to the lifting lower link (32), and a driving push rod (34) hingedly mounted on the towing vehicle (1) and hingedly connected to the lifting upper link (33) for pushing and swinging it, wherein the four pull rod assemblies (31) are hingedly connected to the four corners of the engagement quick-attach frame (4), respectively.

4. The pull rod assembly (31) includes a support sleeve (31A), a first fisheye ball joint (31B) and a second fisheye ball joint (31C) telescopically installed on both ends of the support sleeve (31A), a first fixing bolt screw (31H) for fixing the first fisheye ball joint (31B) to the engagement quick-attach frame (4), a first fisheye mounting bush (31D) and a second fisheye mounting bush (31E) fitted onto the first fixing bolt screw (31H) and pressed against both sides of the first fisheye ball joint (31B), and a first fisheye mounting bush (31D) and a second fisheye mounting bush (31E) installed within the end of the first fisheye ball joint (31B). a first fisheye ball (31I) for matching and abutting with the bush (31E) of the second fisheye ball joint (31C); a second fixing screw (31J) for fixing the second fisheye ball joint (31C) to the towing vehicle (1); a third fisheye mounting bush (31F) and a fourth fisheye mounting bush (31G) fitted onto the second fixing screw (31J) and pressed against both sides of the second fisheye ball joint (31C); and a second fisheye ball (31K) installed within the end of the second fisheye ball joint (31C) for matching and abutting with the third fisheye mounting bush (31F) and the fourth fisheye mounting bush (31G).

5. The towing vehicle (1) includes a chassis body (A), a left crawler (B) and a right crawler (C) installed on both sides of the chassis body (A), a drive module (D) installed in the chassis body (A) for operating the left crawler (B) and the right crawler (C), and a battery unit (E) installed in the chassis body (A) for providing electrical energy to the drive module (D), wherein the drive module (D) is located at the front end of the chassis body (A), the lifting bracket mechanism (3) is hingedly attached to the rear end of the chassis body (A), and the battery unit (E) is located in the middle of the chassis body (A).

5. A small-sized multi-functional electric agricultural machine according to claim 1.

6. 6. The compact multifunctional electric agricultural machine according to claim 5, wherein the drive module (D) includes a variable speed gearbox (D1), a steering gear (D2) installed on the variable speed gearbox (D1) for controlling the steering of the towing vehicle (1), a gear change steering gear (D3) installed on the variable speed gearbox (D1) for controlling the forward and backward movement of the towing vehicle (1), a travel motor (D4) installed on the variable speed gearbox (D1), and a transmission pulley set (D5) installed between the travel motor (D4) and the variable speed gearbox (D1).

7. 7. The compact multifunctional electric agricultural machine of claim 6, wherein a mounting holder (D6) for supporting the traveling motor (D4) and the transmission pulley set (D5) is installed on the speed-change gearbox (D1), the mounting holder (D6) including a support stand (D61) fixed on the speed-change gearbox (D1) and a slide block (D62) slidably installed on the support stand (D61) for fixing the traveling motor (D4), and a mounting groove (D63) for accommodating the movement of the slide block (D62) is installed at one end of the support stand (D61), and a plurality of second elongated grooves (D64) for mounting and adjusting the position of the slide block (D62) are installed within the mounting groove (D63).

8. 7. The small-sized multifunctional electric agricultural machine according to claim 6, wherein the steering gear (D2) includes a steering gear box (D21), a steering gear rotor (D22) swingably installed at the bottom of the steering gear box (D21), a steering motor (D23) installed on the steering gear box (D21) for driving the steering gear rotor (D22) to swing, and a plurality of sets of reduction worm gear pairs (D24) installed in the steering gear box (D21) for transmitting power between the steering motor (D23) and the steering gear rotor (D22).

9. 9. The compact multifunctional electric agricultural machine according to claim 8, wherein the speed-changing gearbox (D1) comprises a box body, an input shaft (D12), a left output shaft (D13), a right output shaft (D14), a speed-changing shaft (D15), and a clutch shaft (D16), wherein a speed-changing gear train (D17) for transmitting power is installed on the input shaft (D12) and the speed-changing shaft (D15), a clutch gear train (D18) for transmitting power is installed on the clutch shaft (D16) and the left output shaft (D13) and the right output shaft (D14), and a left clutch module (D19) and a right clutch module (D100) that can contact and press against the steering gear rotor (D22) are installed on both ends of the clutch shaft (D16), respectively.

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