A belt tensioning rotary tiller

Abstract

The present invention relates to a rotary tiller for agriculture and forestry, and in particular to a belt-driven rotary tiller. The rotary tiller comprises a frame, the rear end of the frame is movably connected with a rotary tiller, the rotary tiller is connected to the frame rotation pair through a special-shaped plate fixed thereon, and the way in which the rotary tiller obtains power is determined by a belt tensioning device. This way of obtaining power through belt transmission and belt tensioning has a buffering and protective effect on weak parts when encountering an overload during work, and is not afraid of dust and wear-resistant, so that the belt-driven rotary tiller works smoothly without the need to set up other clutch devices, has a compact structure, is reasonably compact, has good economy, and is highly practical.

Description

Technical Field

[0001] The invention relates to a rotary tiller for agriculture and forestry, in particular to a belt-driven rotary tiller. Background Art

[0002] In garden management, rotary tillage of land is a regular task. Most of the rotary tillers on the market currently take power directly from the rear drive shaft of the agricultural tractor, and then transmit the power to the rotary tiller through the universal joint shaft and gears. The disadvantage of this type of rotary tiller is that its power is obtained through hard connection, which can easily damage the gearbox, universal joint and other components on the rotary tiller when overloaded instantly. Secondly, this hard connection is prone to local wear in a dusty environment, and will break at the worn area after impact. Summary of the invention

[0003] In order to solve the deficiencies of the above technical solutions, the present invention provides a belt tensioning rotary tiller.

[0004] The technical solution of the present invention is: the belt tensioning rotary tiller comprises a frame, a rotary tiller device is movably connected to the rear end of the frame, and a hydraulic cylinder is connected to the upper end of the rotary tiller device and the upper part of the frame, and is characterized in that: the rotary tiller device is connected to the frame rotation pair through a special-shaped plate fixed thereon, a power input shaft is connected to the special-shaped plate, a passive pulley is fixed on the power input shaft, and belts are set on the passive pulley and the active pulley;

[0005] The frame is also connected to a tension wheel support plate via a rotating pair;

[0006] The front end of the tension wheel support plate is connected to a tension wheel, and the middle is connected to a connecting rod via a rotating pair;

[0007] The upper end of the connecting rod is slidably connected to the special-shaped plate, and the lower end is connected to the middle rotating pair of the tension wheel supporting plate.

[0008] The top end of the tension wheel support plate is connected to the top end of the special-shaped plate by a tension spring;

[0009] An anti-slip shield is respectively arranged at the driving pulley and the driven pulley, and the distance between the inner edge of the anti-slip shield and the outer edge of the driving pulley and the driven pulley is equal to the belt thickness.

[0010] The upper end of the connecting rod is provided with a slide groove, which is sleeved on the pin shaft at the top end of the special-shaped plate, and the lower end of the connecting rod is connected to the tension wheel support plate by a pin.

[0011] One end of the tension spring is connected to the pin at the top end of the special-shaped plate, and the other end is connected to the screw at the top end of the tension wheel support plate.

[0012] The beneficial effects of the present invention are as follows: the belt transmission form can slip when overloaded, thus overcoming the problem of easily damaged parts due to overload caused by hard connection of the transmission mode, and the way of obtaining power is the belt tensioning driving mode, which effectively reduces the instantaneous impact, and secondly, its belt tensioning device also plays the role of obtaining power, without the need to add other clutch structures, the structure is more compact and reasonable, and the size of the rotary tiller is reduced, making it more practical in densely planted garden environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the present invention.

[0014] Figure 2 Schematic diagram of the working state of the present invention.

[0015] Figure 3 Schematic diagram of the special-shaped plate mechanism.

[0016] In the figure: frame 1, active pulley 201, passive pulley 202, anti-slip cover 3, hydraulic cylinder 4, special-shaped plate 5, rotary tillage device 6, rotary tillage blade assembly 7, limiter 8, power input shaft 9, pin one 10, pin two 11, pin three 12, tensioner wheel support 13, tensioner wheel 14, belt 15, tension spring 16, rod 17, pin four 18. DETAILED DESCRIPTION

[0017] The present invention is implemented as follows: Figure 1 , Figure 2 , Figure 3 As shown, the belt tensioning rotary tiller comprises a frame 1, the rear end of the frame 1 is connected to a rotary tilling device 6 by a pin shaft 10, the upper end of the rotary tilling device 6 and the upper end of the frame 1 are connected to a hydraulic cylinder 4, and a limiter 8 for adjusting the depth of the rotary tilling blade assembly 7 is respectively connected to both sides of the rotary tilling device 6. The rotary tilling device 6 is movably connected to the frame 1 through a special-shaped plate 5 fixed thereon and a pin shaft 10.

[0018] Furthermore, a power input shaft 9 is connected to the special-shaped plate 5, a passive pulley 202 is fixed on the power input shaft 9, and a belt 15 is mounted on the passive pulley 202 and the active pulley 201; a tensioning wheel support plate 13 is movably connected to the frame 1 near the pin shaft 10 through the pin shaft 2 11, further, the tensioning wheel support plate 13 is connected to an tensioning wheel 14 at the front end, and the middle thereof is movably connected to the lower end of a connecting rod 17 through the pin shaft 3 12, and the frame 1 and its rear end are connected together through the above-mentioned pin shaft 2 11.

[0019] Preferably, a slide groove is provided at the upper end of the connecting rod 17, and the slide groove sleeve is mounted on the special-shaped plate 5 through a pin shaft 4 18, and the pin shaft 4 18 is installed on the top end of the special-shaped plate 5.

[0020] Preferably, one end of the tension spring 16 is connected to the pin shaft 18 at the top of the special-shaped plate 5, and the other end is connected to the screw at the top of the tension wheel support plate 13.

[0021] Preferably, an anti-slip shield 3 is fixed near the driving pulley 201 and the driven pulley 202 respectively, and the distance between the inner edge and the outer edge of the driving pulley 201 and the driven pulley 202 is equal to the thickness of the belt 15.

[0022] Furthermore, the rotary tillage device 6 has a semi-cylindrical housing that supports a rotary tillage blade assembly 7 via a bearing, and the rotary tillage blade assembly 7 and the power input shaft 9 are connected together by a chain drive or a belt drive.

[0023] How it works

[0024] like Figure 1 As shown, in the initial state, the cylinder rod of the hydraulic cylinder 4 is contracted, the rotary tilling device 6 is lifted, the tension spring 16 has a certain pre-tension, the lower end of the slide groove on the upper part of the connecting rod 17 is supported by the pin shaft four 18 installed on the top of the special-shaped plate 5, and the lower part of the connecting rod 17 supports the tensioning wheel support plate 13 obliquely downward through the pin shaft three 12; at this time, although the tensioning wheel support plate 13 has a tendency to rotate upward around the pin shaft two 11, due to the supporting effect of the connecting rod 17, the tension spring 16 cannot be completely reset, so that the belt 15 is not tensioned by the tensioning wheel 14 connected to the tensioning wheel support plate 13, the tensioning wheel 14 only supports the belt 15 and with the presence of the anti-slip shield 3, the belt 15 will not detach from the active pulley 201 and the passive pulley 202.

[0025] In summary, in this state, the belt 15 is loose, and no matter whether the driving pulley 201 rotates or not, the power will not be transmitted to the driven pulley 202 through the belt 15, and the power will not be transmitted downward, that is, the rotary tilling device 6 does not work.

[0026] like Figure 2 As shown, in the working state, the rod of the hydraulic cylinder 4 extends out and the rotary tillage device 6 connected thereto rotates downward around the pin 10, so that the distance between the active pulley 201 and the passive pulley 202 increases, the belt 15 is tensioned and presses the tensioning wheel 14 to make the tensioning wheel support plate 13 rotate downward around the pin 2 11. At this time, the stretching amount of the tension spring 16 increases, the tensioning wheel 14 has a greater tensioning force on the belt 15, and the belt 15 is tensioned.

[0027] To sum up, in this state, the belt 15 is in a tensioned state. When the driving pulley 201 rotates, the power will be transmitted to the passive pulley 202 through the belt 15, and then drive the power input shaft 9 fixedly connected to the passive pulley 202 to rotate, so that the power is transmitted to the rotary blade assembly 7 via chain drive or belt drive to perform rotary tillage.

[0028] Furthermore, the process from the belt 15 being relaxed to being stretched is a gradual one, and the friction between the belt 15 and the pulley gradually increases, so that the way of obtaining power is relatively gentle, which greatly reduces the impact force when the rotary blade assembly 7 starts to rotate, thereby playing the effect of protecting the components.

Claims

1. A belt tensioning rotary tiller, characterized in that: It comprises a frame, a rotary tillage device is movably connected to the rear end of the frame through a pin shaft, a hydraulic cylinder is connected to the upper end of the rotary tillage device and the upper part of the frame, the rotary tillage device is connected to the frame rotation pair through a special-shaped plate fixed thereon, a power input shaft is connected to the special-shaped plate, a passive pulley is fixed on the power input shaft, and the passive pulley is connected to the active pulley through a belt; The frame is also connected to the rear end of a tension wheel fixing plate by a rotating pair, and the tension wheel supporting plate is movably connected to the frame through a second pin shaft at a location close to the pin shaft; The front end of the tension wheel fixing plate is connected to a tension wheel, and the middle is connected to a connecting rod via a rotating pair; The upper end of the connecting rod is slidably connected to the special-shaped plate, and the lower end is connected to the middle rotating pair of the tension wheel fixing plate; the top end of the tension wheel fixing plate is connected to the top end of the special-shaped plate by a tension spring; The semi-cylindrical housing of the rotary tillage device supports a rotary tillage blade assembly through a bearing, and the rotary tillage blade assembly and the power input shaft are connected together in the form of a chain drive or a belt drive; In the working state, the distance between the driving pulley and the driven pulley increases, the belt is tensioned and presses the tensioning wheel to make the tensioning wheel support plate rotate downward around the second pin shaft.

2. A belt tensioning rotary tiller according to claim 1, characterized in that: The driving pulley and the driven pulley are respectively provided with an anti-slip shield, which is in a semicircular arc shape and the distance between the inner edge and the outer edge of the driving pulley and the driven pulley does not exceed the belt thickness.

3. The belt tensioning rotary tiller according to claim 1, characterized in that: The upper end of the connecting rod is provided with a slide groove, which is sleeved on the pin shaft at the top end of the special-shaped plate, and the lower end of the connecting rod is movably connected with the tension wheel fixing plate by a pin.

4. The belt tensioning rotary tiller according to claim 1, characterized in that: One end of the tension spring is connected to the pin at the top end of the special-shaped plate, and the other end is connected to the screw at the top end of the tension wheel fixing plate.

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