CN1338895A - Harrow for tractor - Google Patents

Abstract

The present invention relates to a harrow for a tractor. According to the invention, there is provided a harrow for a tractor comprising a frame (20) having one end connected to the top part of a rotavator (2) mounted detachably in the rear of a tractor (1), said frame being controlled in its elevation by a hydraulic cylinder (10), a central blade section (30) connected to the underside of the frame (20) and left and right side blades (50 and 60) positioned on opposite sides of the central section (30), wherein the central blade section (30) is provided with a plurality of harrow pieces (37a and 37b) having different extensions in the longitudinal direction of the tractor and the left and right side blades (50 and 60) are formed with a plurality of inclined harrow pieces (57 and 67) inclined inwardly toward bottom ends to gather soil to the inside.

Description

tractor harrow

Field of Invention

The present invention relates to a tractor harrow, especially such a tractor harrow, which can reduce the undulation of the soil caused by land leveling work on land such as paddy fields, and in addition, the harrow blades on both sides of the harrow can be easily folded in Together or unfolded and protected from impact damage by providing safety pins and safety plates.

Background of the Invention

Conventional rake decks have the problem that multiple knives are arranged on a single rake deck, thus causing undulation and accumulation of soil when leveling the land, and the rake width is small, which is bound to be affected by the passing of the tractor. Leaves low-lying marks on the ground, making leveling work ineffective. When crops such as rice are planted in such a field and water is supplied, the young rice at the higher position will wither due to lack of water, while the young rice at the lower position will be drowned due to lack of water. drowned. For this reason, manual finishing work, which required heavy labor and painstaking efforts, had to be done in the past.

Two side rake knife manipulation modes are used in conventional rakes, the manual mode requires the operator to manually lower the rake knife in the paddy field, which causes a lot of inconvenience, while in the automatic mode, foreign matter such as wet soil may be introduced, especially into the hydraulic system, causing malfunction. Another disadvantage of conventional rakes is that the rake is often damaged when working in the fringe areas of paddy fields because there is no damping mechanism or the damping mechanism is not sufficient to absorb the shock when it hits the paddy field embankment.

Summary of the invention

The present invention has been developed to solve the above-mentioned problems, and an object of the present invention is to provide a tractor harrow that can minimize the undulation or accumulation of soil caused by land leveling work on farmland, especially paddy fields, and furthermore, the harrow The side rakes can be easily folded or unfolded and are protected from impact damage by providing safety pins and safety plates.

Brief description of the attached drawings

Figure 1 shows a perspective view of a tractor harrow according to a preferred embodiment of the present invention,

Figure 2 shows a top view of the rake shown in Figure 1,

Figure 3 shows a perspective view of a tractor harrow according to another preferred embodiment of the present invention,

Figure 4 shows an exploded perspective view of the rake shown in Figure 3,

Fig. 5 shows the front view when the frame used in the above-mentioned embodiments and the central section are in an assembled state,

Fig. 6 shows a perspective view of a security panel installed in each of the above-described embodiments.

            Detailed Description of the Invention

According to one aspect of the present invention, a tractor harrow is provided, which includes: a frame 20, one end of which is connected to the top of the rotary blade 2, and the rotary blade is detachably mounted on the rear of the tractor 1, and the frame is moved by a hydraulic cylinder 10 control height; a central rake section 30, which is connected to the bottom side of the frame 20; There are rakes 37a and 37b of different extents in the longitudinal direction of the tractor, while the left and right side rakes 50 and 60 are composed of a plurality of inclined rakes 57 and 67 which are inclined inward toward the bottom end to gather soil to the inside.

According to another aspect of the present invention, a tractor rake is provided, wherein the left and right side rake blades 50 and 60 are mounted on opposite ends of the central rake blade section 30 so as to be able to swing vertically, the frame 20 is connected to the brackets 2b and 2c by pins, The support is attached to the fixed shaft 2a at the top of the rotary cultivating knife 2, and the opposite end of the hydraulic cylinder 10 is connected with the supports 23 and 11 formed on the central position of the frame 20 and the central position of the rotary cultivating knife 2 respectively by pins. Long slots 11a are formed in the bracket 11 at one end of 10 to allow the rakes 30, 50 and 60 to swim to maintain a substantially constant height when they are vertically swung by the tractor, while a central pin 24 will form The brackets 31 and 32 on the central rake section 30 are connected with the brackets 21 and 22 formed on the frame 20, thereby connecting the central rake section 30 to the frame 20 so that the two ends of the central rake section 30 Can swing up and down.

Furthermore, the brackets 31 and 32 on the central rake segment 30 are arranged in front of the corresponding brackets 21 and 22 on the frame 20, while the central pin 24 is connected to a safety pin 25 for fixing the rake plates 30, 50 and 60. By installing the tubes 51 and 61 formed at the respective ends of the side rakes 50 and 60 to the shafts 35 formed at both ends of the central rake section 30, the left and right side rakes 50 and 60 can be rotatably connected at the center. On the rake section 30, the tubes are deflected outwardly at an angle.

In addition, the arms 52 and 62 formed on one side of the pipes 51 and 61 are connected to the bolts 10c fixed on the hydraulic cylinder 10 through the telescopic joint 70, and the left and right side rakes 50 and 60 have safety plates 53 and 63, The abutment of the safety plate against the central rake section 30 prevents these rakes 50 and 60 from swiveling backwards from their normal position and protects the side rakes 50 and 60 from possible damage if they hit obstacles.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows a perspective view of a tractor harrow according to the invention, and Figure 2 shows a top view of the same harrow.

Referring to FIGS. 1 and 2 , the rake includes three sections, a central rake section 30 and left and right side rake sections 50 and 60 . The central rake segment and the left and right side rake segments consist of a plurality of rake elements 37 a , 37 b , 57 and 67 .

Firstly, it can be seen that the central rake segment 30 is made up of a plurality of rake elements 37a, 37b, wherein the leading edges of the two rake elements are not flush. That is, the rake 37a is formed relatively short so as to be positioned in front of the adjacent rake 37b, while the rake 37b is relatively long and the front end is positioned rearward.

In addition, the long rakes 37b are shaped such that the top surface slopes downward in the rearward direction so as to contact the ground only with their end edges, thereby ensuring sufficient space on the surface to collect soil. Specifically, as the rake advances, the soil positioned at a higher position will be leveled by the rake parts, wherein the long rake part 37b mainly collects enough soil, and at the same time, the collected soil then falls down into the low-lying parts of the land to Level the land. This leveling work does not create ridges, primarily because soil is able to slide off between adjacent rake elements 37a and 37b of central rake segment 30 .

The left and right side rake segments 50 and 60 are composed of a plurality of inclined rake members 57 and 67 which are inclined inwardly to their lower ends so as to push the excavated soil inwardly as the tractor 1 moves forward. In this way, soil and water are squeezed inwardly as the tractor advances so as to flow down between adjacent rakes 57 and 67, so that low-lying areas left by the passage of the tractor 1 can be effectively leveled.

This tractor harrow comprises a fixed shaft 2a on a rotary cultivator 2 mounted behind the tractor, the top side of which forms brackets 2b and 2c, on which the ends of a generally U-shaped frame 20 fit and 2c and fastened there by pins. Supports 11 and 23 are formed at the top central position of the rotary cultivator 2 and the top central position of the frame 20, and a hydraulic cylinder 10 is installed in the above-mentioned supports at both ends thereof so that the harrow can vertically swing. Specifically, the hydraulic cylinder 10 is connected to the support 11 on the fixed shaft of the rotary tiller 2 through the pin 14, and the pin passes through a vertical long slit 11a on the support, so that the pin 14 can be placed in the long slit 11a Therefore, even if the tractor 1 makes a vertical swing action through the hydraulic cylinder 10, all the rakes 30, 50, 60 can work at a constant height.

The hydraulic cylinder 10 can be manipulated by an operator in the cab through a valve switch (not shown), since the hydraulic cylinder is connected to the valve switch through a quick coupler 3 located on the hydraulic software leading to the hydraulic cylinder 10. end of tube 10a.

Since a tension spring 12 is connected with a coil 10b formed at one end of the hydraulic cylinder 10 and a bolt 13 installed at the lower end of the bracket 11 to pull the hydraulic cylinder 10 downward, the spring is controlled by turning the bolt 13 upward or downward. 12, that is, the force applied to the rakes 30, 50, 60 mounted on the frame 20 for compacting the ground can be adjusted.

The brackets 31 and 32 attached to the top of the central rake section 30 and the brackets 21 and 22 attached to the underside of the frame 20 are connected to each other by a central pin 24, and the rakes 30, 50 and 60 can be up and down on the left and right sides of the frame 20. swing.

Specifically, as shown in Figure 5, the brackets 31 and 32 mounted on the central rake section 30 are arranged in front of the brackets 21 and 22 mounted on the frame 20, and the central pin 24 is connected with a safety pin 25 for Fasten rake plates 30, 50 and 60. When the tractor 1 backs up and the central rake section 30 accidentally touches an obstacle, the safety pin 25 can also be broken to protect the central rake section 30 from damage.

Since the springs 34 are mounted on both sides of the frame and central rake to elastically support them, the frame 20 and central rake section 30 are prevented from tilting to either side, even when the rake plates 30, 50 and 60 are lifted from the ground ,As shown in Figure 4.

The tubes 51 and 61 connected to the respective ends of the left and right side rake segments 50 and 60 are rotatably fitted on shafts 35 formed at both ends of the central rake segment 30, which are outwardly deflected at an angle of about 20°. incline. Therefore, when the left and right side rake segments 50 and 60 rotate 90° and arrive at the stop 33 fixed on the central rake segment 30, the longitudinal expansion of the side rakes 50 and 60 will rise beyond this 20° angle. To the height of the central rake segment 30. In this way, when the central rake segment 30 is tilted low enough, for example 20° below the horizontal, as the frame 20 descends, the left and right side rake segments 50 and 60 will unfold under the torque of their own weight, which can more clearly understood later.

As shown in Figure 6, the left and right side rake segments 50 and 60 have safety plates 53 and 63 fixed by bolts 54 and 64 on their rear surfaces adjacent to the central rake segment 30, thereby abutting against the The central section 30 prevents the rakes 50 and 60 from swinging back above the water level and prevents the side rakes 50 and 60 from possible damage when the tractor backs up and encounters an obstacle.

In addition, the arms 52 and 62 formed on the above-mentioned tubes 51 and 61 are connected to a bolt 10c fixed to the hydraulic cylinder 10 by a connecting piece 70 comprising a tube 70d which is fitted over the rod by a spring 70a. On a part of 70b, a pin 70c is inserted into the rod 70b to support the spring 70a, so that the link 70 can be extended and contracted.

Therefore, when the hydraulic cylinder 10 contracts to lift the rakes 30, 50 and 60 through the bracket 23 on the frame 20, the distance between the arms 52 and 62 and the bolts 10c fixed on the hydraulic cylinder 10 will be shortened, so that the connecting member 70 Tend to push the arms 52 and 62 to cause the side rakes 50 and 60 to rotate inwardly about the axis 35 to the folded condition. And when side rake knives 50 and 60 arrive at stopper 33, due to the pulling force of spring 70a on the connecting piece 70, they can stop and keep pressurized state, and can not spread out again.

On the other hand, when the hydraulic cylinder 10 is stretched out to lower the rakes 30, 50 and 60, the left and right side rakes will open under the action of their own weight. At this point, the link 70 will urge the side panels to open at a constant speed by the support of the arms 52 and 62 by the spring 70a. Due to the action of the spring 70a, the connecting member 70 exerts more limited resistance during the retraction of the hydraulic cylinder than during the extension of the hydraulic cylinder.

Therefore, if the side rakes 50 and 60 hit an obstacle when the tractor is backing, the link 70 will extend to rotate the side rakes 50 and 60 forward, thereby preventing damage to the side rakes.

Furthermore, the rakes 30 , 50 and 60 are formed in an arched shape so that the midpoint of the central rake section 30 is about 50 mm higher than the outer ends of the side rakes 50 and 60 . In this way, the soil pushed out when the tractor 1 and the rotary tiller 2 pass by can be collected again centrally by the above-mentioned arched rakes 30 , 50 and 60 , resulting in a balance in terms of ground level.

According to the structure of the invention explained above, the tractor harrow is mainly assembled by means of a bracket integrally formed on top of the rotary blade 2, as shown in FIGS. 3 and 4 . By fully retracting the hydraulic cylinder 10 and then tilting and folding the side rakes 50 and 60 under their own weight, the rotary cultivator 2 can be replaced on the job site.

Next, at the work site, with the rake raised, the rotary tiller 2 is lowered to finish tilling in the paddy field, after which the side rake knives 50 and 60 are deployed while the central section 30 is lowered simultaneously to start leveling work. In the leveling operation, the tractor 1 can be compensated by the swinging of the rakes 30, 50 and 60 by means of the pin 24 and the spring 34 to the left and right. The slot 11 swings, so that the front and rear bumps of the tractor 1 can be absorbed by the swing of the rakes 30, 50 and 60, so that the tractor can maintain a horizontal posture substantially at a constant height all the time.

After leveling the ground with this rake, the soil dug up by the angled rakes 57 and 67 on the opposite side rakes 50 and 60 can be collected in the central area to fill in the low ground created by the passage of the tractor. , as described above in conjunction with FIG. 2 . And the rake includes a plurality of rake members 37a, 37b, 57 and 67 protruding alternately and distributed at regular intervals so as to allow water to partly flow down between the rake members during leveling of the paddy field.

As mentioned earlier, in grading work, soil at higher levels can be efficiently channeled to lower levels, and entrained water will flow out between the rake elements without pooling. The result is that it can be done efficiently. Paddy field leveling work. In addition, flexibility and maneuverability are particularly increased due to the provision of the link 70 which enables the side rakes 50 and 60 to be easily folded or unfolded, and are resistant to damage due to the safety pin 25 and the safety plate 53 Security has been enhanced.

Claims (4)

1. A tractor harrow, comprising: a frame (20), one end of which is connected to the top of the rotary blade (2), the rotary blade is detachably mounted on the tractor (1) back, and the height of the frame is hydraulically controlled cylinder (10) control; a central rake segment (30), which is connected to the bottom side of the frame (20); It is characterized in that the central rake segment (30) has a plurality of rakes (37a, 37b) with different extensions along the longitudinal direction of the tractor, while the left and right side rakes (50, 60) are composed of a plurality of inclined rakes (57, 67) Constituted, the above-mentioned inclined rake member is inclined inwardly towards the bottom end to concentrate the soil to the inner side. 2. The tractor harrow according to claim 1, characterized in that, the left and right side harrows (50 and 60) are located at the two ends of the central harrow section (30) so as to be able to swing vertically, and the frame (20) is connected by pins Supports (2b and 2c), the support is attached to the fixed shaft (2a) at the top of the rotary tiller (2), and the two ends of the hydraulic cylinder (10) are connected by pins to form the central position of the frame (20) and the rotary tiller respectively. The support (23,11) on the center position of the top of the knife (2) forms a long slot (11a) on the support (11) at one end of the hydraulic cylinder (10), so that the rake plate (30,50,60) is These rakes are allowed to swim to maintain an approximately constant height when the tractor is oscillating vertically, and by combining the brackets (31, 32) and pins (24) formed on the central rake section (30), the The central rake segment (30) is connected to the frame (20), so that both ends of the central rake segment (30) can swing up and down. 3. The tractor harrow according to claim 2, characterized in that the brackets (31 and 32) on the central rake segment (30) are placed in front of the corresponding brackets (21 and 22) on the frame (20), and The central pin (24) is connected to a safety pin (25) for fixing the rake plates (30, 50, 60) by fitting the tubes (51 and 61) formed at the corresponding ends of the side rake knives (50, 60) On the shafts (35) formed at the two ends of the central rake section (30), the left and right side rakes (50, 60) can be connected to the central rake section (30) in a rotatable manner. The angle is skewed outward. 4. The tractor harrow according to claim 3, characterized in that the arms (52, 62) formed on one side of the tubes (51, 61) are connected by telescopic connections (70) to the on the bolts (10c) on the top, and the left and right side rakes (50, 60) have safety plates (53, 63), which abut against the central rake segment (30) through the safety plate, which can prevent these rakes (50 , 60) swings back from the normal position and protects the side rake knives (50, 60) from possible damage when hitting an obstacle.

Images