Extension type farm working machinery

Abstract

The present invention relates to a rollable automatic extendable agricultural implement, and is an agricultural implement mounted to transmit power to an agricultural tractor while being towed by a detachable part of an agricultural tractor, wherein the agricultural implement is provided with a mounting box hinged to its central part, and a detachable part is connected to the mounting box in a fixed manner so as to be rolled so that both sides of the implement can be inclined diagonally with respect to the hinge with the mounting box, and a connecting link is provided between the agricultural implement and the mounting box to prevent forward and backward oscillation of the agricultural implement when it rolls.

Description

Technology Field

[0001] The present invention relates to a rollable automatic extendable agricultural implement, and more specifically, to a rollable automatic extendable agricultural implement that prevents forward and backward oscillation of the agricultural implement when both sides of the implement are rolled, or swung, with respect to a connecting part connected to a tractor, so that they are inclined diagonally. Background Technology

[0002] Generally, a rotavator, which is one of the agricultural implements, is a piece of agricultural machinery used to till the land for sowing or transplanting crops.

[0003] In other words, a rotary tiller is mounted on a tractor, an agricultural work vehicle, and allows for the sowing or transplanting of crops by tilling farmland to an appropriate depth as multiple tilling blades equipped on a blade shaft, which receives power from the tractor's engine, rotate.

[0004] Such a rotary vator has been proposed in Korean Registered Utility Model No. 20-0492282 (hereinafter referred to as the 'prior art document').

[0005] A conventional rotary tiller disclosed in prior art literature comprises a main body having a power transmission unit for transmitting power from a tractor in an upper central region and both ends finished with respective side plates; support frames on both sides installed between the power transmission unit and both side plates; a gearbox comprising a gear coupling shaft, one end of which is connected to the power transmission unit and the other end of which is rotatably provided by passing through the left side plate via one support frame, i.e., the left support frame; a first sprocket wheel that rotates while being coupled and fixed to the left end of the gear coupling shaft, and a second sprocket wheel that rotates while being coupled and fixed to a blade shaft and connected by a chain.

[0006] At this time, multiple tillage blades are installed in a fixed state attached to the shaft and rotate by the shaft to till the farmland to an appropriate depth.

[0007] In other words, when power from the tractor is transmitted to the power transmission unit, this power is transmitted to the gear shaft connected to the power transmission unit, causing the gear shaft to rotate within the support frame. As the first sprocket wheel, which is fixedly coupled to the gear shaft, rotates together with the gear shaft, the second sprocket wheel, which is connected by a chain, rotates. Consequently, the blade shaft rotates due to the rotation of the second sprocket wheel, causing multiple tillage blades to till the farmland.

[0008] However, since conventional rotary tillers are connected and mounted in a fixed position at the rear of a tractor, it is difficult to maintain a level surface on irregularly uneven farmland due to the characteristics of the land. Consequently, if the rotary tiller is not maintained level with respect to the farmland, the tilling blades of the rotary tiller will till the land at an angle, resulting in varying tilling depths and making it impossible to till the land evenly.

[0009] In addition, even if a rotary tiller is connected to a tractor in a rolling manner, there is a disadvantage in that when the rotary tiller rolls along the surface of irregular farmland, the play generated at the connection point between the rotary tiller and the tractor causes the rotary tiller to oscillate in the forward and backward directions, deviating from the intended position and rolling in a twisted state. Consequently, a portion of the farmland remains uncultivated, and the overall cultivated area of ​​the farmland becomes distorted. Prior art literature

[0010] Republic of Korea Registered Utility Model No. 20-0492282 The problem to be solved

[0011] Accordingly, the present invention has been devised to solve the problems of the prior art as described above, and aims to provide a rollable automatic extendable agricultural implement that is connected to a tractor in a rolling manner so that both sides of the agricultural implement can be inclined diagonally, while blocking and preventing forward and backward oscillation of the agricultural implement when it is rolled diagonally from the tractor. means of solving the problem

[0012] The rolling automatic extendable agricultural implement according to the present invention for achieving the above-mentioned purpose is an agricultural implement that is mounted to a detachable part of an agricultural tractor in a towing state and capable of transmitting power to the agricultural tractor, wherein the agricultural implement is provided with a mounting box hinged to its central part, and a detachable part is connected to the mounting box in a fixed manner so as to be rolled so that both sides of the implement can be inclined diagonally with respect to the hinge with the mounting box, and a connecting link is provided between the agricultural implement and the mounting box to prevent forward and backward oscillation of the agricultural implement when it is rolled.

[0013] In addition, a front hinge plate and a rear hinge plate are formed to protrude from the mounting box, and the input shaft of an implement into which power from an agricultural tractor is input is connected so as to pass through the front hinge plate so as to be rotatable relative to it, and the rear hinge plate is provided with an elongated hole into which a pin that is connected and fixed to the hinge plate of the implement is movably connected so as to be able to roll on the mounting box, and the rear hinge plate may be provided with a stop hole into which a fixing pin that passes through the hinge plate of the implement is connected to block the rolling of the implement.

[0014] In addition, the agricultural implement is equipped with a main shaft that receives power from a tractor at its central part and rotates, and on both sides of the main shaft, a blade shaft is provided so as to be axially movable, which is extended by being pulled out from the main shaft or retracted by being retracted to perform tillage work while rotating together with the main shaft, a hydraulic means for moving the blade shaft from the main shaft is provided, and a back plate may be provided that is moved together with the blade shaft by the hydraulic means for moving the blade shaft to extend or retract, and covers the main shaft and the blade shaft.

[0015] In addition, the back plate includes a central back plate provided on the upper part of the main shaft to cover the main shaft, and lateral back plates connected to each side of the central back plate to be movable and provided to expand or contract from the central back plate, and the lateral back plates may be provided to be moved together with the shaft by a hydraulic means.

[0016] In addition, the lateral back plate may be further provided with a connecting plate that connects the lateral back plate to the blade shaft so that the lateral back plate and the blade shaft can move simultaneously by means of a hydraulic means.

[0017] Specifically, the connecting plate is fixedly provided on the side back plate, while the blade shaft is rotatably provided on the connecting plate, and the blade shaft is provided with an end block that closes the interior of the blade shaft, and the connecting plate is provided with a bearing housing that is sealed and coupled to the end block protruding from the blade shaft, and a bearing is provided between the bearing housing and the end block such that the end block rotates together with the blade shaft, and the bearing housing may be provided with a cap nut having a working hole that blocks the exposure of the bearing and the end block while supplying lubricant to the bearing.

[0018] In addition, the hydraulic means may comprise a slide tube fixed to the central back plate; a plurality of slide tubes each fixed to both side back plates and configured to move into and out of the slide tube, with a port formed on one side for hydraulic pressure to enter and exit; and a connecting rod fixed in a state penetrating the slide tube, with both ends inserted into and movable into each of the two slide tubes, and having ports on both sides for hydraulic pressure to enter and exit, so that the connecting rod and both slide tubes may be extended and expanded as hydraulic pressure is supplied to the port of the slide tube on one side.

[0019] In addition, the blade shaft includes a fixed blade shaft fixed to the main shaft and a movable blade shaft movably provided on the main shaft, and between the fixed blade shaft and the movable blade shaft, a foreign matter entanglement prevention bar may be provided, the length of which extends or shortens as the movable blade shaft moves.

[0020] In addition, the fixed blade shaft between the two foreign matter entanglement prevention bars may be equipped with a lug bar that rotates together with the shaft to remove foreign matter and prevent foreign matter from entanglement on the shaft.

[0021] In addition, a shock absorber may be provided between the agricultural implement and the mounting box to cushion the implement rolling in the mounting box. Effects of the invention

[0022] According to the rollable automatic expandable agricultural implement of the present invention, both sides of the agricultural implement connected to the tractor are rolled diagonally along irregular farmland relative to the connection point, while effectively blocking and preventing the forward and backward oscillation of the rolling agricultural implement, thereby allowing the farmland to be tilled without omission, which has the advantage of improving tillage efficiency. Brief explanation of the drawing

[0023] FIG. 1 is a drawing illustrating a rotary tiller as an example of an agricultural implement according to the present invention. FIG. 2 is a side view illustrating a central drive unit for driving a rotavator according to the present invention. FIG. 3 is an exploded view illustrating a structure in which a gearbox configured in a rotavator according to the present invention is connected to a mounting box in a rolling state. FIG. 4 is a drawing illustrating a shock absorber and a connecting link configured between a rotavator and a mounting box according to the present invention. FIG. 5 is a cross-sectional view illustrating the expansion structure of a rotary vator according to the present invention. FIG. 6a is an enlarged view of part A of FIG. 5, and FIG. 6b is an enlarged view of part B of FIG. 6a. Figure 7 is an enlarged view of section C of Figure 5. FIG. 8 is an exploded view of a rotavator according to the present invention. FIG. 9 is a cross-sectional view of a cylinder means configured on the back plate of a rotavator according to the present invention. FIGS. 10 and FIGS. 11 are drawings illustrating the expanded state and the contracted state, respectively, of a rotavator according to the present invention. Specific details for implementing the invention

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0025] The terms used in this invention are defined considering their functions within the invention; however, since these may vary depending on the intentions or practices of the user or operator, the definitions of these terms should be interpreted in a meaning and concept consistent with the technical details of this invention.

[0026] In addition, the embodiments of the present invention are not intended to limit the scope of the rights of the present invention, but are merely exemplary details of the components presented in the claims of the present invention, and are embodiments that include components that are included in the technical concept throughout the specification of the present invention and can be substituted as equivalents for the components of the claims.

[0027] Additionally, optional terms in the following examples are used to distinguish one component from another, and the components are not limited by said terms.

[0028] Accordingly, in describing the present invention, detailed descriptions of related prior art that may unnecessarily obscure the essence of the invention are omitted.

[0029] The attached drawings, Figures 1 to 11, illustrate a centrally driven rotary tiller, an expansion structure, and a support structure of the rotary tiller as an example of a rollable automatic expandable agricultural implement according to the present invention.

[0030] As shown in the drawing, the rollable automatic extendable agricultural implement according to the present invention is mounted and connected to the rear of an agricultural tractor in a manner that allows power transmission, and the agricultural implement mounted on the agricultural tractor is configured such that both sides thereof roll at an angle while its length extends to the left and right sides.

[0031] Here, agricultural implements include harvesters, rotary tillers, plows, seeders, mulching machines, soil covering machines, trailers, balers, compost spreaders, etc., but in this embodiment, a rotary tiller (100) will be described as an example of an agricultural implement as shown in the drawing.

[0032] And, we will explain by giving an agricultural tractor equipped with a rotary tiller (100) as an example of an agricultural work vehicle.

[0033] Meanwhile, the above-mentioned rotary tiller (100) is provided by being connected to a detachable part (200) mounted on the rear of a tractor (not shown), as shown in FIG. 1.

[0034] First, the detachable part (200) includes a frame (210) provided parallel to the rotavator (100) as shown in FIGS. 1 and 2, and a slider (220) provided to be accessible from both ends of the frame (210).

[0035] An upper link (10) is hinge-connected to the upper surface of the frame (210), and an upper hook (211) with an open lower surface is rotatably connected to the front end of the upper link (10) and connected to the upper mounting pin of the mounting box (126) configured in the rotavator (100) to be described later.

[0036] Additionally, a power transmission unit (230) for transmitting power from the tractor to the rotary tiller (100) is provided on the lower surface of the frame (210) and is coupled with the power transmission unit (120) of the gearbox (110) to be described later.

[0037] And, the slider (220) is provided with a lower link of the three-point linkage provided on the tractor hinged to its lower end, and a lower hook (221) with an open upper surface is rotatably connected to the front end of the lower link and connected to the lower mounting pin of the mounting box (126) to be described later.

[0038] Thus, the upper hook (211) of the detachable part (200) is inserted from top to bottom and coupled to the upper mounting pin of the mounting box (126) configured in the rotavator (100), and the lower hook (221) of the detachable part (200) is inserted from bottom to top and coupled to the lower mounting pin of the mounting box (126), so that the upper and lower hooks (211) (221) rotate in a direction facing each other and are coupled to the upper and lower mounting pins of the mounting box (126), thereby the rotavator (100) is mounted to the detachable part (200) with a strong coupling force.

[0039] Meanwhile, as shown in FIGS. 1 to 3 and FIGS. 5, the rotary tiller (100) that is attached to and detached from the tractor's attachment part (200) as described above is equipped with a gearbox (110) in its center that receives power from the tractor and is driven, and is able to maintain balance so that both the left and right sides are kept horizontal with respect to the gearbox (110).

[0040] The gearbox (110) is provided to be mounted and detached from the detachable part (200) by a mounting box (126), and the mounting box (126) is provided in a state where it covers the gearbox (110) on the upper part of the slide tube (161) to be described later.

[0041] Such mounting boxes (126) are hinge-coupled to the front and rear hinge portions of the gearbox (110), respectively, such that the front hinge portion of the gearbox (110) is configured at the front end of the input shaft (121), and the rear hinge portion of the gearbox (110) is configured at the rear end of the slide tube (161).

[0042] In particular, the front hinge portion of the gearbox (110) includes a hinge bushing (123) that is rotatably coupled to the front end of the input shaft (121) via a bearing (122), and the front hinge plate (128) of the mounting box (126), which will be described later, is fitted onto the outer surface of the hinge bushing (123) and hinge-coupled.

[0043] And, the rear hinge portion of the gearbox (110) includes a plurality of hinge plates (127) formed on the upper surface of the rear end of the slide tube (161), and the hinge plates (127) are provided with a coupling hole (127a) of a regular hole spaced apart in a triangular shape. A rear hinge plate (129) of a mounting box (126), which will be described later, is fitted between these plurality of hinge plates (127) and hinge-coupled.

[0044] Accordingly, the rotary tiller (100) is coupled to the detachable part (200) and rolls in which the left and right sides are inclined in opposite directions based on the front and rear hinge parts of the towed mounting box (126). Through rolling, the rotary tiller (100) can always be provided in a horizontal state relative to the farmland regardless of the flatness of the farmland, and since the farmland is tilled in this state, the tillage depth can be formed consistently.

[0045] That is, when the tractor tilts to the left due to irregular farmland, the rotary tiller (100) can tilt relatively to the right depending on the farmland, and conversely, when the tractor tilts to the right, the rotary tiller (100) can tilt relatively to the left depending on the farmland, thus having a rolling effect.

[0046] Additionally, the gearbox (110) is equipped with a power transmission unit (120) that is connected to the power transmission unit (230) of the tractor, i.e., the detachable part (200), and receives power from the tractor. The power transmission unit (120) can be configured to be coupled with the power transmission unit (230) of the detachable part (200) in a dog clutch structure to enable power transmission.

[0047] And, as shown in FIG. 2, the power transmission unit (120) is provided with an input shaft (121) protruding toward the detachable part (200) of the tractor, a dog clutch is fixedly provided at the front end of the protruding input shaft (121), and a first sprocket wheel (124) is connected to the rear end of the input shaft (121) to enable power transmission.

[0048] This first sprocket wheel (124) is connected to the second sprocket wheel (112) of the shaft (111) to be described later via a chain (125) to enable power transmission.

[0049] Additionally, a main shaft (111) is provided at the bottom of the gearbox (110) so as to protrude to both sides of the gearbox (110), and a second sprocket wheel (112) is fixedly provided at the outer center of the main shaft (111) so as to allow the second sprocket wheel (112) and the main shaft (111) to rotate simultaneously.

[0050] Thus, power from the tractor is input to the input shaft (121) through the power transmission unit (120), and the input power is transmitted to the main shaft (111) through the first sprocket wheel (124), the chain (125), and the second sprocket wheel (112) and output.

[0051] Meanwhile, as the gearbox (110) is provided in the central part of the rotary tiller (100) as described above, there exists uncultivated land in the farmland below the gearbox (110) that is the width of the gearbox (110).

[0052] Accordingly, the lower end of the gearbox (110) is provided with a plow protrusion (110a) protruding downward as shown in FIGS. 2 and 3, and the plow protrusion (110a) excavates uncultivated land corresponding to the width of the gearbox (110).

[0053] In particular, during the tilling operation of the rotary tiller (100), the soil of the excavated farmland may accumulate in the central lower part of the rotary tiller (100), that is, the lower part of the gearbox (110), by the tilling operation of the tilling blade (151) rotating on both sides of the gearbox (110). The plow stone (110a) disperses the soil accumulated in this way to both sides and simultaneously removes weeds from the uncultivated land.

[0054] As shown in FIGS. 1 and FIGS. 8, a mounting box (126) is hinge-connected to the upper part of such a gearbox (110).

[0055] This mounting box (126) has a box-shaped cross-sectional structure with an open bottom surface and includes a cover portion (126a) that covers the upper surface of the gearbox (110), i.e., the power transmission portion (120), and an extension portion (126b) in the shape of an "∧" that extends downward from one end of the cover portion (126a) that is close to the detachable portion (200) of the tractor.

[0056] Mounting pins are fixedly provided in such a cover part (126a) and an extension part (126b), to which the upper and lower hooks (211) (221) of the detachable part (200) are respectively hooked and connected. Among the mounting pins, the upper mounting pin is formed to be fixed to the upper surface of the cover part (126a) so that the upper hook (211) of the detachable part (200) is connected, and the lower mounting pin is formed to be fixed to the lower end of both extension parts (126b) so that the lower hook (221) of the detachable part (200) is connected.

[0057] Meanwhile, a hollow main shaft (111) is provided through the lower part of the gearbox (110) and protrudes to both sides of the gearbox (110), and hollow blade shafts (150) (150a) are provided on both sides of the main shaft (111) in a square shape or other polygonal shape as shown in FIG. 7, so as not to rotate relative to each other.

[0058] And, on the upper part of the gearbox (110), a back plate is provided that is length-adjustable according to the length of the blade shaft (150) (150a) which is moved from the main shaft (111) to expand or contract, and the back plate is provided including a central back plate (160) and a side back plate (170).

[0059] First, the knife shaft (150)(150a) provided on the main shaft (111) is provided with a movable knife shaft (150) that slides in the axial direction of the main shaft (111) and a fixed knife shaft (150a) that is coupled and fixed to the main body (111), and both knife shafts (150)(150a) are provided by being coupled to the main shaft (111) in a polygonal shape.

[0060] A plurality of tilling blades (151) for tilling work are installed at regular intervals on these knife shafts (150) (150a).

[0061] In particular, the movable knife shaft (150) is provided to slide and protrude while being coupled to the main shaft (111) in a shape-matched manner, and the main shaft (111) is provided with a hydraulic means for sliding the movable knife shaft (150) on the main shaft (111).

[0062] This hydraulic means slides the movable knife shaft (150) on the main shaft (111) while simultaneously sliding the lateral plate (170) on the central plate (160), which will be described later, together with the movable knife shaft (150). The hydraulic means will be described in detail in the description of the plates that will be described later.

[0063] Meanwhile, among the above-mentioned knife shafts, the fixed knife shaft (150a) is provided with a lug bar (152) that protrudes from the center side, i.e., the gearbox (110) side, from the bracket (hereinafter collectively referred to as "fixed knife shaft") for mounting the tilling blade (151) on the fixed knife shaft (150a) as shown in FIG. 5, and rotates together with the fixed knife shaft (150a) to remove weeds from the tilled soil and prevent weeds from getting wrapped around the shaft.

[0064] These lug bars (152) are provided to protrude axially between the shaft and the tilling blade (151), thereby removing weeds dug up from the soil by the tilling blade (151), which prevents weeds from getting tangled around the shaft.

[0065] In addition, as described above, the two lug bars (152) located on each side of the gearbox (110) with the gearbox (110) in between can be provided symmetrically at 180 degrees. That is, if the two lug bars (152) are provided symmetrically at 180 degrees with respect to the gearbox (110), balance can be maintained during rotation of the main shaft (111), and if the balance of the main shaft (111) is maintained, the generation of vibration and operating noise can be reduced.

[0066] Additionally, both lug bars (152) are provided with leading ends protruding toward the gearbox (110) from both sides of the gearbox (110) and inclined toward the outer direction of the fixed blade shaft (150a). This allows weeds removed by the lug bars (152) to be wound onto the lug bars (152), and the removed weeds are moved toward the outer end (fixed end) of the lug bars (152) which is spaced far from the gearbox (110).

[0067] Thus, even if weeds removed by the lug bar (152) are wrapped around the lug bar (152), it is possible to prevent the weeds from getting wrapped around and tangled in the gearbox (110) and its output end, thereby preventing malfunction.

[0068] Additionally, between the fixed blade shaft (150a) and the movable blade shaft (150), a foreign matter entanglement prevention bar (153) is further provided, the length of which is extended or shortened as the movable blade shaft (150) moves.

[0069] As shown in FIGS. 10 and 11, the foreign matter entanglement prevention bar (153) is provided by combining multi-stage bars of different diameters in a telescopic structure, so that it rotates and extends like the knife shaft (150) (150a), thereby preventing foreign matter such as weeds from being entangled in the movable knife shaft (150) and the main shaft (111).

[0070] These foreign matter entanglement prevention bars (153) can also be provided on both sides of the gearbox (110) in a symmetrical manner at 180 degrees, just like the lug bar (152), and since the effect is the same as that of the lug bar (152), the explanation is replaced by the explanation of the lug bar (152).

[0071] In addition, as described above, it is preferable that the movable blade shaft (150), which protrudes and extends from the main shaft (111), be provided in a state where it overlaps with the main shaft (111) by more than 40%. In this area, the gap that may occur between the movable blade shaft (150) and the main shaft (111) during rotary work such as backfilling or tilling using the extended blade shaft (150) can be eliminated, thereby allowing the work to be performed stably.

[0072] Meanwhile, the shafts (111) connected to each side of the gearbox (110) are configured with sealing portions to block leakage of oil for lubrication, as shown in FIG. 6a and FIG. 6b.

[0073] These sealing portions are provided within a gearbox cover (130) formed as a hollow cylinder that is fixedly coupled to each side of the gearbox (110), and a support plate (131) is provided at the outer end of the gearbox cover (130) to cover the sealing portion provided between the gearbox cover (130) and the main shaft (111).

[0074] This support plate (131) blocks and covers the gap between the outer end of the gearbox cover (130) and the main shaft (111), while being bolted and fixed to the bearing fixing member (133) of the sealing part to be described later.

[0075] Thus, a spaced-apart space is provided between the gearbox cover (130) and the main shaft (111) by means of the gearbox cover (130) and the support plate (131), and sealing portions are installed at each end of this space.

[0076] As illustrated in FIG. 6b, the sealing portion includes a bearing (132) provided inside the spaced-apart space between the gearbox cover (130) and the main shaft (111), a bearing fixing member (133) provided outside the spaced-apart space from the bearing (132) and supporting and fixing the bearing (132) with one end in contact with the bearing (132), a group seal (134) provided between the bearing fixing member (133) and the bearing (132) to maintain airtightness, and a group seal support member (135) provided between the group seal (134) and the bearing (132) to support the group seal (134).

[0077] The bearing (132) is a conventional ball bearing having a plurality of balls arranged to roll between the inner ring and the outer ring. The inner ring of the bearing (132), which is coupled and fixed on the outer circumference of the shaft (111), is configured to rotate together with the shaft (111) while supporting the outer surface of the shaft (111), and the outer ring of the bearing (132) is configured to be supported in contact with the inner surface of the gearbox cover (130).

[0078] The bearing fixing member (133) is a ring-shaped sealing member provided with an O-ring (136) interposed on the inner surface contacting the main shaft (111) and the outer surface contacting the inner surface of the gearbox cover (130), and a bolt is fastened to the outer surface facing the support plate (131) to secure the support plate (131).

[0079] The group seal (134) is a ring-shaped sealing material with a cross-section formed in the shape of a "T", and a partition wall protruding vertically from the center is positioned between the bearing fixing member (133) and the group seal support member (135) to provide sealing. This group seal (134) is also provided with an O-ring (136) interposed on each side in contact with the bearing fixing member (133) and the group seal support member (135) to provide sealing.

[0080] Accordingly, the bearing (132) provided between the gearbox cover (130) and the main shaft (111) is not only firmly sealed by the group seal (134) and the group seal support member (135), but is also firmly fixed in position by the bearing fixing member (133) and the support plate (131), thereby maintaining its position.

[0081] Meanwhile, along with the knife shaft (150) (150a) that expands as described above, the back panel and door are also provided to expand (extend) as shown in FIG. 1 and FIG. 8.

[0082] To this end, a central back plate (160) is fixedly provided on the upper part of the gearbox (110), and a central door (180) is hingedly provided at the rear end of the central back plate (160). Side back plates (170) are slidably provided on each side of the central back plate (160) so as to be expanded or contracted from the central back plate (160). Side door (190) is hingedly provided at the rear end of the side back plate (170) so as to be moved together with the side back plate (170). A hydraulic means is provided to slide the side back plate (170) from the central back plate (160) to expand or contract it.

[0083] The central back plate (160) is provided in a state where it protrudes to both sides from the upper part of the gearbox (110) and covers the gearbox (110), and the side back plates (170) are provided so as to be slidably moved in the axial direction (lengthwise direction) on each side of the central back plate (160). These side back plates (170) are provided to be moved simultaneously on both sides of the central back plate (160) by means of a hydraulic means, and when the side back plates (170) are reduced, the side back plates (170) are inserted into the lower part of the central back plate (160) and provided in an overlapping state.

[0084] And, the hydraulic means for moving the side plate (170) from the central plate (160) comprises a slide tube (161) fixed to the central plate (160), a plurality of slide tubes (171) each fixed to the two side plates (170) and configured to enter and exit the slide tube (161), with a port (171a) formed on one side for hydraulic fluid to enter and exit, and a connecting rod (173) fixed in a state penetrating the slide tube (161), with both ends inserted into and movable by the two slide tubes (171) respectively, and having ports (173a) (173b) on both sides for hydraulic fluid to enter and exit, so that as hydraulic fluid is supplied to the port (171a) of the one side slide tube (171), the connecting rod (173) and the two slide tubes (171) are extended and expanded.

[0085] The slide tube (161) is provided as a hollow tube installed on the upper surface of the central back plate (160) in the longitudinal direction, i.e., the left-right direction, and the corresponding slide tube (171) is also provided as a hollow tube installed on the upper surface of the side back plate (170) in the left-right direction. Such slide tubes (171) are provided to have an outer diameter that allows them to be inserted into and move in and out of the interior of the slide tube (161).

[0086] In addition, as shown in FIG. 9, a port (171a) through which hydraulic fluid enters and exits is formed in one side of the slide tube (171) of the two slide tubes, and a stopper (172) is formed protrudingly on the inner side of the slide tube (171) on the side where the port (171a) is located, so that a connecting rod (173) contacts the slide tube (171) and stops the movement between the slide tube (171) and the connecting rod (173).

[0087] At this time, the port (171a) of the slide tube (171) is provided at a position corresponding to the tip of the stopper (172), so that when the slide tube (171) and the connecting rod (173) are retracted, the connecting rod (173) comes into contact with the stopper (172), and thus the connecting rod (173) does not pass through the port (171a) of the slide tube (171).

[0088] Meanwhile, the connecting rod (173) is also provided as a hollow tube with an empty interior, and a piston (174) that closes the opening of the connecting rod (173) is respectively attached and fixed to both ends, and both pistons (174) are provided to move while inserted into each of the two slide tubes (171).

[0089] And, first and second ports (173a) and (173b) through which hydraulic fluid enters and exits are respectively formed in the connecting rod (173) in front of the piston (174). Thus, when hydraulic fluid is supplied to the first port (173a) (left port in Fig. 9), both slide tubes (171) on both sides of the connecting rod (173) move toward the center and contract, and when hydraulic fluid is supplied to the second port (173b) (right port in Fig. 9), both slide tubes (171) on both sides of the connecting rod (173) are drawn out to the outside and expand.

[0090] The hydraulic means operating in this manner is configured such that the slide tubes (171) on both sides move simultaneously through a single connecting rod (173) that penetrates the slide tube (161), thereby allowing the structure of the hydraulic means to be configured simply while enabling precise control of the operation in which the two side plates (170) move simultaneously from the central plate (160) to expand or contract.

[0091] In addition, the back panels (160) (170) as described above are provided with doors that cover the rear of the rotor (100). A central door (180) is hinged to the rear end of the central back panel (160) so that it can rotate in a downwardly perpendicular manner, and a side door (190) is hinged to the rear end of the side back panel (170) so that it can rotate in a downwardly perpendicular manner.

[0092] The central door (180) and the side door (190) are each moved to expand or contract like the back panel (160) (170), and both side door (190) are inserted into the central door (180) to allow entry and exit. Thus, the door (180) (190) is configured to expand or contract by adjusting its length like the upper central back panel (160) and side back panel (170).

[0093] Meanwhile, the lateral plate (170), which is moved from the central plate (160) by a hydraulic means, is provided to move simultaneously with the movable knife shaft (150).

[0094] To this end, the lateral back plate (170) is provided with a connecting plate (175) that connects the lateral back plate (170) to the outer end of the movable knife shaft (150), and the lateral back plate (170) and the movable knife shaft (150) are integrated by the connecting plate (175) and are provided to expand or contract while moving simultaneously.

[0095] These connecting plates (175) are fixedly provided on the side back plate (170), and the movable knife shaft (150) is rotatably coupled to the connecting plate (175).

[0096] To specifically describe the coupling structure between the movable knife shaft (150) and the connecting plate (175) as shown in FIGS. 5 and 7, an end block (154) that seals the interior of the movable knife shaft (150) is provided at the outer end of the movable knife shaft (150), and a bearing housing (176) that is sealed and coupled to the end block (154) protruding from the movable knife shaft (150) is provided on the connecting plate (175), and a bearing (177) that allows the end block (154) to rotate together with the movable knife shaft (150) is provided between the bearing housing (176) and the end block (154), and a cap nut (179) having a working hole (179a) that blocks the exposure of the bearing (177) and the end block (154) while supplying lubricant to the bearing (177) is coupled to the bearing housing (176).

[0097] The end block (154) includes a finishing portion (154a) that is inserted into the outer end of the movable knife shaft (150) to close the opening of the movable knife shaft (150), and a protrusion portion (154b) that is formed protruding from the finishing portion (154a) and is provided to protrude outward from the movable knife shaft (150).

[0098] The end portion (154a) of the end block (154) is welded and fixed while inserted into the movable knife shaft (150), and the protrusion (154b) is provided to protrude outward from the movable knife shaft (150), and a sealing groove (155) for sealing is formed between the protrusion (154b) and the end portion (154a) so as to be recessed toward the end portion (154a).

[0099] A group seal (156) is provided in the sealing groove (155). One end of the group seal (156) is inserted into the sealing groove (155), and the other end is inserted between the bearing housing (176) and the protrusion (154b) of the end block (154).

[0100] This group seal (156) is a ring-shaped sealing material with a cross-section formed in the shape of a "T", and a partition wall protruding vertically from the center is positioned between the end portion (154a) of the end block (154) and the bearing housing (176) to provide sealing.

[0101] Additionally, on both sides of the center of the group seal (156), O-rings (157) are fitted to seal the end portion (154a) of the end block (154) and the bearing housing (176), respectively.

[0102] And, the bearing housing (176) is formed as a hollow tube with a through hole in its interior, and the inner side of the bearing housing (176) is formed with a stepped shape such that the inner diameter of the end portion that is connected to the end portion (154a) of the end block (154) narrows, and a bearing (177) is provided in contact with the stepped portion (176a).

[0103] At this time, the bearing (177) is a conventional ball bearing having a plurality of balls arranged to roll between the inner ring and the outer ring, the inner ring of the bearing (177) is fitted and fixed to the outer circumference of the protrusion (154b) of the end block (154), and the outer ring of the bearing (177) is inserted and fixed to the inner circumference of the bearing housing (176), so that the end block (154) is rotatably provided within the bearing housing (176) by the bearing (177).

[0104] These bearings (177) are positioned by lock nuts (178) consisting of multiple nuts each fastened to the protrusions (154b) of the end block (154).

[0105] A cap nut (179) is provided to be coupled to the outer end of the bearing housing (176) to block the exposure of the bearing (177) and the lock nut (178) inside the bearing housing (176).

[0106] At this time, a plurality of working holes (179a) are formed through the surface, i.e., the outer surface, of the cap nut (179), and the working holes (179a) thus formed can be used to attach a tool for attaching and detaching the cap nut (179), and can also be used to inject and supply lubricant to the bearing (177) through the working holes (179a).

[0107] Meanwhile, between the mounting box (126) and the rotavator (100) as described above, a plurality of shock absorbers (140) are provided on each side to cushion the rolling of the rotavator (100).

[0108] As shown in FIG. 4, the shock absorber (140) includes a cylinder body (140a) in which hydraulic pressure acts, and a rod (140b) provided to move in and out of one end of the cylinder body (140a).

[0109] The lower end of the cylinder body (140a) is hinged to the lower end of the extension (126b) of the mounting box (126), and the rod (140b) that enters and exits from the upper end of the cylinder body (140a) has its tip (upper end) hinged to the slide tube (161) of the gearbox (110).

[0110] Accordingly, when both ends of the rotavator (100) are rolled diagonally in the mounting box (126), the rods (140b) on both sides that are rolled diagonally along with the rotavator (100) move in and out of each cylinder body (140a) and provide a cushioning effect.

[0111] Meanwhile, in this embodiment, a structure is illustrated in which the cylinder body (140a) is positioned at the bottom and connected to the lower end of the extension part (126b) of the mounting box (126), and the rod (140b) is positioned at the top and connected to the slide tube (161) of the gear box (110). This is so that the rod (140b) is positioned at the top of the cylinder body (140a) to prevent damage to the rod (140b) caused by foreign matter flying upward during plowing operations on farmland, and as damage to the rod (140b) is prevented, malfunction of the shock absorber (140) can be prevented.

[0112] In addition, a guard (141) is provided on the rear side (facing the rotary tiller (100)) of the extension part (126b) of the mounting box (126) to block foreign matter splashing toward the shock absorber (140) during tillage work by the rotary tiller (100) and to protect the shock absorber (140) from foreign matter.

[0113] At this time, the guard (141) is formed as a plate having an area sufficient to cover the rear of the shock absorber (140), and may also be provided at an angle corresponding to the inclination of the shock absorber (140). In this way, if the guard (141) is provided at an angle corresponding to the shock absorber (140), the area covering the shock absorber (140) is maximized relative to the same area, thereby allowing the shock absorber (140) to be protected more safely.

[0114] Additionally, a connecting link (142) is provided between the extension (126b) of the mounting box (126) and the central plate (160) to prevent back-and-forth oscillation of the rotavator (100) during rolling.

[0115] As shown in FIG. 4, the connecting link (142) has one end hinged to the extension (126b) of the mounting box (126) and the other end hinged to the upper surface of the central back plate (160). In addition, a bend (142a) is formed on one side of the connecting link (142) to avoid interference with the slide tube (161) provided on the upper surface of the central back plate (160).

[0116] Thus, when the two sides of the rotary tiller (100) are rolled diagonally in the detachable part (200) by the connecting link (142), the back-and-forth swinging of the rotary tiller (100) is blocked, so that the two sides of the rotary tiller (100) that were tilling the farmland are rolled precisely in the up-and-down direction according to the flatness of the farmland in place, thereby allowing the entire farmland to be tilled without missing any spots.

[0117] The rotary vator (100) according to the present invention as described above receives power from the tractor through a power transmission unit (120) coupled with the power transmission unit (230) of the tractor.

[0118] The power transmitted in this manner is input to the input shaft (121) of the power transmission unit (120) configured on the upper part of the gearbox (110) as shown in FIG. 2, and the input power is transmitted to the second sprocket wheel (112) through the first sprocket wheel (124) connected to the input shaft (121), and the power transmitted to the second sprocket wheel (112) is output through the main shaft (111) provided on each side of the second sprocket wheel (112).

[0119] In this way, the power output to the main shaft (111) causes the main shaft (111) to rotate, and the blade shaft (150) (150a) coupled to it in a shape-matched manner rotates simultaneously with the rotation of the main shaft (111), and as the blade shaft (150) (150a) rotates, the tilling blade (151) fixed thereto rotates as a whole, thereby excavating and tilling the farmland.

[0120] In particular, the length, or width, of the tilling blade (151) used to till the farmland can be expanded and contracted according to the performance of the tractor.

[0121] That is, when the performance of the tractor to which the rotary tiller (100) is connected is high output, as shown in FIG. 10, the movable knife shaft (150) is extended from the main shaft (111), and at the same time, the side plate (170) connected to the movable knife shaft (150) is also extended from the central plate (160).

[0122] The expansion of the movable knife shaft (150) and the side back plate (170) is achieved by a hydraulic means. As shown in the lower drawing of FIG. 9, when hydraulic pressure is supplied to the port (171a) of the slide tube (171) provided on one side back plate (170), the one side slide tube (171) is pulled out from the connecting rod (173) and expanded. During this process, the hydraulic pressure supplied between the piston (174) of the connecting rod (173) and the tip of the slide tube (171) flows into the second port (173b) of the connecting rod (173). The hydraulic pressure flowing into the second port (173b) is discharged to the first port (173a) of the connecting rod (173) on the opposite side and flows into the other side slide tube (171), thereby pushing the other side slide tube (171) outward from the connecting rod (173) and pulling out the central back plate (160) and From the main axis (111), the lateral back plate (170) and the movable knife axis (150) are each withdrawn and expanded as shown in Fig. 10.

[0123] Conversely, as shown in the upper drawing of FIG. 9, when hydraulic pressure is discharged through the port (171a) of the one-sided slide tube (171), the one-sided slide tube (171) is moved toward the connecting rod (173) by vacuum pressure, and in this process, the hydraulic pressure within the connecting rod (173) is discharged through the second port (173b) into the space between the piston (174) of the connecting rod (173) and the tip of the slide tube (171), and at the same time, as the hydraulic pressure within the other-sided slide tube (171) flows into the first port (173a) by vacuum pressure acting within the connecting rod (173), the other-sided slide tube (171) is also moved toward the connecting rod (173), and the side plate (170) and the movable knife shaft (150) that were withdrawn are retracted into the central plate (160) and the main shaft (111), respectively, and are reduced as shown in FIG. 11.

[0124] In this way, as the length of the blade shaft (150)(150a) is expanded or contracted, the working area of ​​the rotary tiller (100) can be expanded or contracted according to the performance of the agricultural tractor, allowing for rapid and efficient tillage work, and as the length of the blade shaft (150)(150a) is adjusted, the length of the back plate (160)(170) is simultaneously adjusted.

[0125] In addition, as the back panels (160) (170) expand or contract, the door panels (180) (190) hinged to each back panel (160) (170) also move at the same time to expand or contract.

[0126] Thus, the length between the central plate (160) and the lateral plate (170) is adjusted according to the length of the knife shaft (150) (150a) that expands or contracts from the main shaft (111), thereby preventing the scattering of soil upward or backward during tillage.

[0127] Meanwhile, the rotary tiller (100) described above can cultivate farmland while maintaining horizontal alignment on both the left and right sides with respect to the central gearbox (110).

[0128] In addition, the rotary tiller (100) is equipped with a gearbox (110) that is mounted on a mounting box (126) on the detachable part (200) of the tractor, so that both the left and right sides are inclined up and down by the length of the elongated hole (129b), thereby allowing the rotary tiller (100) to remain horizontal to the farmland regardless of the flatness of the farmland, so that the farmland can be tilled evenly to a certain depth.

[0129] Meanwhile, since the rotary tiller (100) that rolls in this manner is prevented from oscillating back and forth by the connecting rod (142), the rotary tiller (100) that tills the farmland is rolled so that both sides of it are incised only in the up and down direction without oscillating back and forth, so that the entire farmland can be tilled without missing any parts.

[0130] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention, and the invention is not limited thereto. It is evident that modifications or improvements can be made by those skilled in the art within the technical scope of the invention.

[0131] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols

[0132] 100 : Rotavator 110 : Gearbox 110a : Plowshare 111 : Main shaft 112: Second sprocket wheel 120: Power transmission unit 121 : Input shaft 122 : Bearing 123: Hinge bushing 124: 1st sprocket wheel 125 : Chain 126 : Mounting box 126a : Cover part 126b : Extension part 127 : Hinge plate 127a : Connecting hole 128: Front hinge plate 128a: Penetration hole 129: Rear hinge plate 129a: Stop hole 129b : Long hole 130 : Gearbox cover 131 : Support plate 132 : Bearing 133: Bearing fixing member 134: Group seal 135: Group seal support member 136: O-ring 140 : Shock absorber 140a : Cylinder body 140b : Piston rod 141 : Guard 142 : Connecting link 142a : Bent section 150, 150a : Knife shaft 151 : Till blade 152 : Rug bar 153 : Foreign object entanglement prevention bar 154 : End block 154a : Closing part 154b : Protrusion 155 : Sealing groove 156 : Group seal 157 : O-ring 160 : Central Stand 161 : Slide Rental 170 : Lateral turn 171 : Slide control 171a: Port 172: Stopper 173 : Connection load 173a, 173b : Port 174 : Piston 175 : Connecting plate 176 : Bearing housing 176a : Step portion 176b : O-ring 177 : Bearing 178 : Lock nut 179 : Cap nut 179a : Work opening 180 : Central door 190 : Side door 200 : Detachable part 210 : Frame 211 : Top hook 220 : Slider 221 : Bottom hook 230 : Power transmission unit

Claims

Claim 1 An expandable agricultural rotary tiller mounted to transmit power to an agricultural tractor, comprising: a gearbox located in the center of the rotary tiller and driven by receiving power from the tractor; a main shaft rotated by the gearbox on both lower sides of the gearbox; a blade shaft slidably coupled to the main shaft and rotatably coupled via a side connecting plate and a bearing, and equipped with a plurality of tilling blades; a central back plate covering the main shaft from above and having a sliding tube fixed thereto; a central door rotatably hinged to the central back plate; a side back plate coupled to the connecting plate, covering the blade shaft from above, and having a sliding tube fixed thereto that is inserted into the sliding tube and slides therein; and a side door rotatably hinged to the side back plate and slidingly coupled to the central door. As the sliding tube fixed to the side back plate slides by hydraulic pressure while inserted into the sliding tube fixed to the central back plate, the side door and the blade shaft slide to the central door and the main shaft, respectively, thereby expanding or contracting, and the blade shaft at both ends An expandable agricultural rotary tiller comprising a mounted end block, wherein the connecting plate is coupled with a bearing housing that accommodates a bearing in contact with the end block of the knife shaft. Claim 2 delete Claim 3 An expandable agricultural rotary tiller according to claim 1, wherein the bearing housing is equipped with a cap nut having a working opening that blocks the exposure of the bearing and the end block while supplying lubricant to the bearing. Claim 4 An expandable agricultural rotary tiller according to claim 1 or 3, comprising a mounting box such that the upper hook and lower hook of the agricultural tractor are connected to the upper and lower portions, respectively, thereby allowing the agricultural rotary tiller to be mounted on the agricultural tractor, wherein the mounting box is hinge-connected to the agricultural rotary tiller while covering the power transmission portion of the gearbox at the upper portion of the gearbox, so as to enable the agricultural rotary tiller to roll relative to the agricultural tractor while mounted on the agricultural tractor. Claim 5 An expandable agricultural rotarytaver according to claim 4, wherein a connecting link is provided between the agricultural rotarytaver and the mounting box to prevent back-and-forth oscillation of the agricultural rotarytaver during rolling. Claim 6 An expandable agricultural rotavator according to claim 5, wherein a shock absorber is provided between the agricultural rotavator and the mounting box to cushion the rolling motion of the agricultural rotavator. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 delete

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