Flail box and harvester

Abstract

The utility model provides a kind of flail box and harvester, wherein, flail box includes body, extension, flail arbor, bearing and flail cutterhead, extension is connected with the lower end of body;Flail arbor is along axial and is arranged in body and extension, and the end of flail arbor is protruding from the lower end of extension;The outer ring of bearing is set to the inner wall of extension, the inner ring of bearing is sleeved in flail arbor, to make flail arbor can rotate relative to extension;Flail cutterhead is set on the part of flail arbor and protrudes from extension, along the axial of flail arbor, the axial distance between bearing and flail cutterhead is less than the axial distance between bearing and body.The utility model shortens the axial distance between bearing and flail cutterhead, reduces the bending moment that flail arbor bears when working, improves the stress working condition of flail arbor, reaches the purpose of improving the service life of flail arbor, reducing the failure probability and maintenance cost of flail box.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and more specifically, to a sling box and a harvester. Background Technology

[0002] In related technologies, the support bearing of the cutter box is usually located in the upper part of the box body. There is a large axial distance between the bearing and the cutter disc below, making the cutter shaft a long cantilever stress structure. During operation, the radial impact load on the cutter disc when cutting straw will generate a large bending moment on the cutter shaft, resulting in harsh stress conditions. Under long-term alternating loads, the cutter shaft is prone to fatigue deformation or even fracture, directly reducing the overall service life of the cutter box, increasing the cost of use and maintenance, and making it difficult to meet the needs of high-intensity, long-term field operations. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this utility model proposes a knife-spinning box.

[0005] The second aspect of this utility model proposes a harvester.

[0006] In view of the above, according to the first aspect of the present invention, the present invention provides a swivel cutter box, which includes a body, an extension, a swivel cutter shaft, a bearing, and a swivel cutter disc. The extension is connected to the lower end of the body. The swivel cutter shaft passes through the body and the extension along the axial direction, and the end of the swivel cutter shaft extends out of the lower end of the extension. The outer ring of the bearing is disposed on the inner wall of the extension, and the inner ring of the bearing is sleeved on the swivel cutter shaft so that the swivel cutter shaft can rotate relative to the extension. The swivel cutter disc is disposed on the portion of the swivel cutter shaft that extends out of the extension. Along the axial direction of the swivel cutter shaft, the axial distance between the bearing and the swivel cutter disc is less than the axial distance between the bearing and the body.

[0007] This utility model proposes a tool-spinning box. The tool-spinning box includes a body, an extension, a tool-spinning shaft, a bearing, and a tool-spinning disc. The body is the main supporting shell of the tool-spinning box, and an internal cavity is formed inside the body. The extension is a hollow cylindrical structure, connected to the lower end of the body, and the internal cavity of the extension is axially connected to the internal cavity of the body.

[0008] The swivel shaft is a shaft component that transmits rotational power. The swivel shaft passes through the internal cavity of the main body and the internal cavity of the extension along the axial direction, and the end structure of the swivel shaft extends beyond the lower end face of the extension.

[0009] The bearing is a rotary support component. The outer ring of the bearing is set on the inner wall surface of the extension, and the inner ring of the bearing is sleeved on the outer circumferential surface of the swivel cutter shaft. The bearing is used to support the swivel cutter shaft so that the swivel cutter shaft can rotate relative to the extension about its own axis.

[0010] The stalk cutter disc is a disc-shaped component that mounts the cutting blades. It is mounted on the extended section of the stalk shaft and rotates synchronously with the shaft to complete the straw cutting operation. Along the axial direction of the stalk shaft, the axial distance between the bearing and the stalk cutter disc is less than the axial distance between the bearing and the main body.

[0011] In related technologies, all bearings supporting the cutter shaft are located in the upper internal region of the main body. A significant axial distance exists between the bearings and the cutter disc mounted below, creating a long cantilever structure for the section of the cutter shaft below the bearings. When the cutter box is operating in the field, the cutter disc is continuously subjected to radial impact loads as it cuts straw. These radial impact loads act on the cantilevered end of the cutter shaft, generating a large bending moment at the bearing support section. The long cantilever structure corresponds to a higher bending moment, resulting in greater bending stress on the cutter bearing. Under long-term alternating impact loads, the cutter shaft is prone to fatigue deformation and even fracture, directly leading to a short service life and high equipment operating and maintenance costs.

[0012] This invention addresses the problems existing in related technologies by adding an extension at the lower end of the main body. The bearing supporting the cutter shaft is installed inside the extension, causing the overall axial position of the bearing to shift downwards towards the cutter disc. During operation, the radial impact load generated by the cutter disc cutting straw is directly transmitted to the lower section of the cutter shaft. The load forms a bending moment with the bearing's support point as the fulcrum. The value of the bending moment is equal to the load magnitude multiplied by the axial distance from the load application point to the support fulcrum. After the bearing shifts downwards towards the cutter disc, the axial distance between the load application point and the support fulcrum shortens, and the corresponding bending moment decreases accordingly. The maximum bending stress on the cutter bearing decreases as the bending moment decreases, directly improving the stress state of the cutter shaft. This reduces the probability of fatigue damage to the cutter shaft under alternating loads, thus extending the overall service life of the cutter box.

[0013] In summary, this utility model, by providing an extension at the lower end of the main body and installing the support bearing inside the extension, shortens the axial distance between the bearing and the swivel cutter disc, reduces the bending moment borne by the swivel cutter shaft during operation, improves the stress conditions of the swivel cutter shaft, and achieves the purpose of increasing the service life of the swivel cutter shaft and reducing the probability of swivel box failure and maintenance costs.

[0014] Optionally, in some technical solutions of this utility model, the end of the extension that is away from the main body is located near the upper surface of the swivel cutter disc, and the bearing is located near the end of the extension that is away from the main body.

[0015] Optionally, in some technical solutions of this utility model, the inner wall of the extension is provided with a bearing mounting groove, and the bearing is embedded in the bearing mounting groove.

[0016] In some technical solutions of this utility model, optionally, a first snap-fit ​​portion is provided at one end of the extension portion facing the main body; a second snap-fit ​​portion is provided at one end of the main body facing the extension portion, and the first snap-fit ​​portion and the second snap-fit ​​portion snap-fit ​​together.

[0017] In some technical solutions of this utility model, optionally, the swivel cutter disc and the swivel cutter shaft are connected in a conical fit.

[0018] Optionally, in some technical solutions of this utility model, the lower end of the swivel shaft is provided with an outer conical section, and the center of the swivel disc is provided with an inner conical hole. The taper of the outer conical section is consistent with the taper of the inner conical hole, and the outer conical section and the inner conical hole fit together.

[0019] Optionally, in some technical solutions of this utility model, the swivel cutter head includes: a first cutter head assembly, the first cutter head assembly having an inner conical hole at its center, the first cutter head assembly being connected to the outer conical section of the swivel cutter shaft through the inner conical hole; and a second cutter head assembly, the second cutter head assembly being connected to the end face of the first cutter head assembly facing away from the extension.

[0020] In some technical solutions of this utility model, optionally, the first cutter head assembly includes: a first disc body, the first disc body being provided with a first mounting hole and an inner conical hole; a first cutting blade, the first cutting blade being mounted on the first disc body through the first mounting hole; the second cutter head assembly includes: a second disc body, the second disc body being provided with a second mounting hole, the second disc body being connected to the end face of the first disc body away from the extension portion; a second cutting blade, the second cutting blade being mounted on the second disc body through the second mounting hole.

[0021] Optionally, in some technical solutions of this utility model, the main body includes: a first connecting section; an input shaft passing through the first connecting section; a first gear sleeved on the input shaft and located inside the first connecting section; a second connecting section connected to the first connecting section, the interior of the second connecting section communicating with the interior of the first connecting section, and a swivel shaft disposed inside the second connecting section; and a second gear sleeved on the swivel shaft, the second gear meshing with the first gear.

[0022] According to a second aspect of the present invention, a harvester is provided, which includes a knife box as described in any of the above technical solutions.

[0023] The harvester proposed in the second aspect of this utility model includes the knife-slinging box as described in any of the above technical solutions, and therefore has all the beneficial effects of the knife-slinging box in any of the above technical solutions, which will not be repeated here.

[0024] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This shows one of the structural schematic diagrams of the knife-spinning box in some embodiments of the present invention; Figure 2 The second schematic diagram of the structure of the knife-spinning box in some embodiments of this utility model is shown; Figure 3 The third schematic diagram of the structure of the knife-spinning box in some embodiments of this utility model is shown; Figure 4 The fourth schematic diagram of the structure of the knife-spinning box in some embodiments of this utility model is shown; Figure 5 A schematic diagram of the harvester in some embodiments of the present invention is shown.

[0026] Figure label: 100 Tool-spinning box, 110 Body, 112 Second snap-fit ​​part, 114 First connecting section, 116 Input shaft, 118 First gear, 120 Second connecting section, 122 Second gear, 130 Extension, 132 Bearing mounting groove, 134 First snap-fit ​​part, 140 Tool-spinning shaft, 142 Outer tapered section, 150 Bearing, 160 Tool-spinning disc, 162 Inner tapered hole, 164 First disc assembly, 174 Second disc assembly. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0029] The following is combined with Figures 1 to 5 The present invention describes a knife box 100 and a harvester as proposed in some embodiments.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this utility model, a swivel cutter box 100 is proposed. The swivel cutter box 100 includes a body 110, an extension 130, a swivel cutter shaft 140, a bearing 150, and a swivel cutter disc 160. The extension 130 is connected to the lower end of the body 110. The swivel cutter shaft 140 passes through the body 110 and the extension 130 axially, and the end of the swivel cutter shaft 140 extends out of the lower end of the extension 130. The outer ring of the bearing 150 is disposed on the inner wall of the extension 130, and the inner ring of the bearing 150 is sleeved on the swivel cutter shaft 140 so that the swivel cutter shaft 140 can rotate relative to the extension 130. The swivel cutter disc 160 is disposed on the portion of the swivel cutter shaft 140 that extends out of the extension 130. Along the axial direction of the swivel cutter shaft 140, the axial distance between the bearing 150 and the swivel cutter disc 160 is less than the axial distance between the bearing 150 and the body 110.

[0031] In this embodiment, the present invention provides a tool-spinning box 100. The tool-spinning box 100 includes a body 110, an extension 130, a tool-spinning shaft 140, a bearing 150, and a tool-spinning disc 160. The body 110 is the main supporting shell of the tool-spinning box 100, and an internal cavity is formed inside the body 110. The extension 130 is a hollow cylindrical structure, connected to the lower end of the body 110, and the internal cavity of the extension 130 is axially connected to the internal cavity of the body 110.

[0032] The swivel shaft 140 is a shaft component that transmits rotational power. The swivel shaft 140 passes through the internal cavity of the main body 110 and the internal cavity of the extension 130 along the axial direction. The end structure of the swivel shaft 140 extends beyond the lower end face of the extension 130.

[0033] The bearing 150 is a rotary support component. The outer ring of the bearing 150 is disposed on the inner wall surface of the extension 130, and the inner ring of the bearing 150 is sleeved on the outer peripheral surface of the swivel shaft 140. The bearing 150 is used to support the swivel shaft 140, so that the swivel shaft 140 can rotate relative to the extension 130 around its own axis.

[0034] The rotary cutter disc 160 is a disc-shaped component for mounting cutting blades. The rotary cutter disc 160 is mounted on the shaft section extending from the extension 130 of the rotary cutter shaft 140. The rotary cutter disc 160 rotates synchronously with the rotary cutter shaft 140 to complete the straw cutting operation. Along the axial direction of the rotary cutter shaft 140 (e.g., ...) Figure 2 (In the direction indicated by the middle arrow A), the axial distance between the bearing 150 and the cutter head 160 is less than the axial distance between the bearing 150 and the body 110.

[0035] In related technologies, all bearings supporting the cutter shaft are located in the upper internal region of the main body. A significant axial distance exists between the bearings and the cutter disc mounted below, creating a long cantilever structure for the section of the cutter shaft below the bearings. When the cutter box is operating in the field, the cutter disc is continuously subjected to radial impact loads as it cuts straw. These radial impact loads act on the cantilevered end of the cutter shaft, generating a large bending moment at the bearing support section. The long cantilever structure corresponds to a higher bending moment, resulting in greater bending stress on the cutter bearing. Under long-term alternating impact loads, the cutter shaft is prone to fatigue deformation and even fracture, directly leading to a short service life and high equipment operating and maintenance costs.

[0036] This invention addresses problems existing in related technologies by adding an extension 130 to the lower end of the main body 110. The bearing 150 supporting the blade shaft 140 is installed inside the extension 130, causing the overall axial position of the bearing 150 to shift downwards towards the blade disc 160. During operation of the blade box 100, the radial impact load generated by the blade disc 160 cutting straw is directly transmitted to the lower shaft section of the blade shaft 140. The load forms a bending moment with the bearing 150 as the fulcrum. The value of the bending moment is equal to the load magnitude multiplied by the axial distance from the load application point to the support fulcrum. After the bearing 150 shifts downwards towards the blade disc 160, the axial distance between the load application point and the support fulcrum shortens, and the corresponding bending moment value decreases synchronously. The maximum bending stress borne by the swivel cutter shaft 140 decreases as the bending moment decreases, the stress state of the swivel cutter shaft 140 is directly improved, the probability of fatigue damage of the swivel cutter shaft 140 under alternating loads decreases, and the overall service life of the swivel cutter box 100 is improved.

[0037] In summary, by providing an extension 130 at the lower end of the main body 110 and installing the bearing 150 inside the extension 130, the axial distance between the bearing 150 and the sling cutter disc 160 is shortened, the bending moment borne by the sling cutter shaft 140 during operation is reduced, and the stress condition of the sling cutter shaft 140 is improved, thereby achieving the purpose of increasing the service life of the sling cutter shaft 140 and reducing the failure probability and maintenance cost of the sling cutter box 100.

[0038] In this embodiment, the connection between the extension 130 and the lower end of the body 110 means that the extension 130 is an independently processed hollow cylindrical component, the upper end face of the extension 130 is in contact with the lower end face of the body 110, the extension 130 and the body 110 are connected as a whole by a fixing structure, the inner cavity of the extension 130 is axially connected with the inner cavity of the body 110, and the axis of the extension 130 coincides with the axis of the body 110.

[0039] In this embodiment, the swivel shaft 140 passes through the body 110 and the extension 130 along the axial direction. The end of the swivel shaft 140 extends out of the lower end of the extension 130, meaning that the axis of the swivel shaft 140 coincides with the axis of the body 110 and the axis of the extension 130. The swivel shaft 140 passes through the inner cavity of the body 110 and the inner cavity of the extension 130 from top to bottom. The lower end shaft segment of the swivel shaft 140 extends out of the lower end face of the extension 130 and extends to the outer space of the extension 130.

[0040] In this embodiment, the fact that the swivel cutter disc 160 is located on the portion of the swivel cutter shaft 140 extending out of the extension 130 means that the center part of the swivel cutter disc 160 is connected to the lower end of the swivel cutter shaft 140. The swivel cutter disc 160 is located entirely below the extension 130, and the swivel cutter disc 160 can rotate around its own axis together with the swivel cutter shaft 140.

[0041] In this embodiment, the axial distance between the bearing 150 and the cutter disc 160 along the axial direction of the cutter shaft 140 is less than the axial distance between the bearing 150 and the body 110. This means that, with the axial center plane of the bearing 150 as the measurement reference, the straight-line distance from the axial center plane of the bearing 150 to the upper end face of the cutter disc 160 along the axial direction of the cutter shaft 140 is less than the straight-line distance from the axial center plane of the bearing 150 to the upper end face of the body 110. In other words, the overall axial position of the bearing 150 is closer to the cutter disc 160 and farther away from the upper end face of the body 110.

[0042] Optionally, the bearing 150 may be a deep groove ball bearing, with the outer ring of the bearing 150 and the inner wall of the extension 130 being fixed by an interference fit, and the inner ring of the bearing 150 and the outer periphery of the swivel shaft 140 being fixed by an interference fit.

[0043] Optionally, the extension 130 and the lower end of the body 110 can be fixed by bolt connection, and a sealing gasket is provided between the mating end faces of the extension 130 and the body 110.

[0044] Optionally, the inner wall of the extension 130 is provided with an annular limiting step, the lower end face of the annular limiting step abutting against the upper end face of the bearing 150, and the annular limiting step is used to restrict the bearing 150 from moving upward along the axial direction.

[0045] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this utility model, optionally, the end of the extension 130 away from the body 110 is disposed near the upper end surface of the swivel blade disc 160, and the bearing 150 is disposed near the end of the extension 130 away from the body 110.

[0046] In this embodiment, the extension 130 is a hollow cylindrical structure extending axially. The lower end face of the extension 130 and the upper end face of the cutter head 160 are arranged axially opposite each other, with an axial gap between them, so they do not contact each other. The bearing 150 is integrally installed in the lower region of the inner cavity of the extension 130. The outer wall of the outer ring of the bearing 150 is fixedly fitted with the inner wall of the extension 130, and the axial position of the bearing 150 is close to the lower end face of the extension 130.

[0047] In this embodiment, the present invention adopts the above-described structural layout, which can further reduce the axial distance between the bearing 150 and the blade disc 160, and shorten the length of the cantilever section of the blade shaft 140 located below the bearing 150. When the blade box 100 is in operation, the radial impact load on the blade disc 160 when cutting straw acts on the lower end of the blade shaft 140, forming a bending moment with the bearing 150 as the support point. After the cantilever section length is shortened, the corresponding bending moment value decreases synchronously, and the maximum bending stress borne by the blade shaft 140 is further reduced, which can more effectively prevent fatigue deformation or fracture of the blade shaft 140 and improve the overall service life of the blade box 100. At the same time, the setting of the lower end of the extension 130 close to the blade disc 160 can reduce the opening gap between the extension 130 and the blade disc 160, reducing the probability of field dust and straw debris entering the extension 130 and wearing the bearing 150.

[0048] Optionally, the inner wall of the extension 130 is provided with an annular limiting shoulder, the lower end face of the annular limiting shoulder abutting against the upper end face of the outer ring of the bearing 150, and the annular limiting shoulder is used to limit the bearing 150 from moving upward along the axial direction.

[0049] Optionally, a dustproof sealing ring is installed on the lower inner wall of the extension 130. The dustproof sealing ring is sleeved on the outer periphery of the swivel shaft 140 and is located below the bearing 150.

[0050] like Figure 2 As shown, in some embodiments of this utility model, optionally, the inner wall of the extension 130 is provided with a bearing mounting groove 132, and the bearing 150 is embedded in the bearing mounting groove 132.

[0051] In this embodiment, the inner wall of the extension 130 is provided with a bearing mounting groove 132, and the bearing 150 is embedded in the bearing mounting groove 132. The bearing mounting groove 132 is an annular groove extending circumferentially along the inner wall of the extension 130, and the axial groove width of the bearing mounting groove 132 is adapted to the axial width of the bearing 150. The outer ring of the bearing 150 is completely embedded in the bearing mounting groove 132, the outer peripheral surface of the outer ring of the bearing 150 is in contact with the bottom surface of the groove of the bearing mounting groove 132, and the upper end surface and lower end surface of the outer ring of the bearing 150 abut against the upper groove wall and the lower groove wall of the bearing mounting groove 132, respectively.

[0052] This invention uses the bearing mounting groove 132 to achieve radial positioning and bidirectional axial limiting of the bearing 150, preventing axial movement or radial displacement of the bearing 150 under the high-speed rotation of the cutter shaft 140 and the action of cutting impact loads. This ensures that the installation position of the bearing 150 remains stable, thereby maintaining the axial distance between the bearing 150 and the cutter disc 160 and ensuring the continuous effectiveness of the force optimization effect of the cutter shaft 140. Simultaneously, the bearing mounting groove 132 can serve as a positioning reference during bearing 150 assembly, improving the assembly accuracy of the bearing 150 and simplifying the assembly process.

[0053] Optionally, the bottom surface of the bearing mounting groove 132 and the outer circumferential surface of the outer ring of the bearing 150 are fitted with an interference fit to further enhance the firmness of the bearing 150 installation.

[0054] Optionally, an assembly chamfer is provided at the junction of the upper groove wall of the bearing mounting groove 132 and the inner wall of the extension 130. The assembly chamfer is used to guide the bearing 150 to be installed axially into the bearing mounting groove 132.

[0055] Optionally, the inner wall of the extension 130 is provided with a retaining ring mounting groove below the bearing mounting groove 132. A retaining ring for a hole is installed in the retaining ring mounting groove, and the upper end face of the retaining ring for a hole abuts against the lower end face of the outer ring of the bearing 150.

[0056] like Figure 2 As shown, in some embodiments of the present invention, optionally, the extension 130 is provided with a first snap-fit ​​portion 134 at one end facing the body 110; the body 110 is provided with a second snap-fit ​​portion 112 at one end facing the extension 130, and the first snap-fit ​​portion 134 and the second snap-fit ​​portion 112 are snapped together.

[0057] In this embodiment, a first engaging portion 134 is provided at one end of the extension 130 facing the body 110. A second engaging portion 112 is provided at one end of the body 110 facing the extension 130, and the first engaging portion 134 and the second engaging portion 112 engage with each other. The first engaging portion 134 is arranged circumferentially along the upper end of the extension 130, and the second engaging portion 112 is arranged circumferentially along the lower end of the body 110. The shapes of the first engaging portion 134 and the second engaging portion 112 are adapted to each other, and the two are inserted and engaged axially, so that the extension 130 and the body 110 are positioned radially and circumferentially.

[0058] This invention achieves rapid alignment and positioning of the extension 130 and the main body 110 through a snap-fit ​​connection, ensuring that the axis of the extension 130 coincides with the axis of the main body 110, avoiding coaxiality deviation during assembly, and thus ensuring the smooth rotation of the cutter shaft 140. Simultaneously, the snap-fit ​​structure can pre-fix the relative positions of the two during assembly, reducing the difficulty of subsequent fastening operations and improving assembly efficiency.

[0059] Optionally, the first latching portion 134 is an annular latching platform protruding along the upper end face of the extension portion 130, and the second latching portion 112 is an annular latching groove recessed along the lower end face of the body 110, with the annular latching platform embedded inside the annular latching groove.

[0060] Optionally, a sealing ring is provided between the mating surfaces of the first snap-fit ​​portion 134 and the second snap-fit ​​portion 112, and the sealing ring is used to seal the gap between the extension portion 130 and the body 110.

[0061] Optionally, after the extension 130 is engaged with the body 110, it is axially fastened by bolts arranged in a circumferential manner.

[0062] like Figure 1 and Figure 2 As shown, in some embodiments of this utility model, optionally, the spade disc 160 and the spade shaft 140 are connected in a conical fit.

[0063] In this embodiment, the swivel cutter head 160 and the swivel cutter shaft 140 are connected by a conical surface. The central connecting surface of the swivel cutter head 160 is a conical surface, and the corresponding outer surface of the swivel cutter shaft 140 is also a conical surface. The two conical surfaces have the same taper, and after being pressed together axially, they fit completely together, transmitting rotational torque through the friction of the conical surfaces.

[0064] This utility model adopts the above-mentioned connection structure, and the contact area between the cutter head 160 and the cutter shaft 140 is larger than that of the traditional spline connection, resulting in lower compressive force per unit area and less wear and deformation of the mating surfaces. At the same time, the conical surface mating has self-aligning characteristics, which can ensure the coaxiality of the cutter head 160 and the cutter shaft 140, reduce yaw vibration during rotation, further reduce the wear rate of the connection position, and extend the overall service life.

[0065] like Figure 1 and Figure 2 As shown, in some embodiments of this utility model, optionally, the lower end of the swivel blade shaft 140 is provided with an outer tapered section 142, and the center of the swivel blade disc 160 is provided with an inner tapered hole 162. The taper of the outer tapered section 142 is consistent with the taper of the inner tapered hole 162, and the outer tapered section 142 and the inner tapered hole 162 fit together.

[0066] In this embodiment, the lower end of the swivel shaft 140 is provided with an outer tapered section 142, and the center of the swivel cutter disc 160 is provided with an inner tapered hole 162. The taper of the outer tapered section 142 is consistent with the taper of the inner tapered hole 162, and the outer tapered section 142 and the inner tapered hole 162 fit together. The outer tapered section 142 extends along the axial direction of the swivel shaft 140, and the diameter of the outer tapered section 142 gradually decreases in the direction away from the body 110. The inner tapered hole 162 extends through the axial direction of the swivel cutter disc 160, and the diameter of the hole wall of the inner tapered hole 162 gradually decreases in the direction away from the body 110. The outer tapered section 142 is inserted into the inner tapered hole 162, and the tapered surfaces of the two are in close contact throughout the entire process.

[0067] This invention forms a complete tapered mating surface through the outer tapered section 142 and the inner tapered hole 162, providing sufficient contact area and uniform load distribution. This avoids the problem of localized stress concentration on the tooth surface in spline connections and reduces wear on the mating surface. Simultaneously, the guiding effect of the tapered surface ensures that the cutter head 160 automatically remains coaxial with the cutter shaft 140 during assembly, resulting in higher assembly accuracy, smaller radial runout of the cutter head 160 during rotation, and stronger operational stability.

[0068] Optionally, the axial length of the inner conical hole 162 is greater than the axial length of the outer conical section 142, and the outer conical section 142 is completely accommodated inside the inner conical hole 162.

[0069] Optionally, the surface of the outer conical section 142 is provided with a wear-resistant coating, which is used to improve the wear resistance of the conical surface.

[0070] In this embodiment, the outer conical section 142 is a structural segment integrally machined at the lower end of the swivel shaft 140. The outer conical section 142 is coaxially arranged with the main body of the swivel shaft 140, without any spliced ​​or separate structures. The integrally formed structure can ensure the overall structural strength of the swivel shaft 140, avoid stress concentration at the split connection points, and at the same time ensure the coaxiality accuracy between the outer conical section 142 and the main body of the swivel shaft 140, thereby improving the smoothness of the swivel shaft 140 during high-speed rotation.

[0071] Optionally, a flat key is provided on the outer wall of the outer conical section 142, and a keyway is provided on the wall of the inner conical hole 162. The flat key is embedded in the keyway to assist in transmitting the circumferential torque between the swivel shaft 140 and the swivel disc 160, and to prevent circumferential slippage during the conical surface mating.

[0072] like Figure 2 , Figure 3 and Figure 4As shown, in some embodiments of this utility model, optionally, the swivel cutter head 160 includes a first cutter head assembly 164 and a second cutter head assembly 174; the center of the first cutter head assembly 164 is provided with an inner conical hole 162, and the first cutter head assembly 164 is connected to the outer conical section 142 of the swivel cutter shaft 140 through the inner conical hole 162; the second cutter head assembly 174 is fixedly connected to the end face of the first cutter head assembly 164 away from the extension portion.

[0073] In this embodiment, the first cutter head assembly 164 and the second cutter head assembly 174 are arranged vertically along the axial direction of the swivel cutter shaft 140. The first cutter head assembly 164 serves as the basic load-bearing structure. Its central inner tapered hole 162 has the same taper as the outer tapered section 142 integrally formed at the lower end of the swivel cutter shaft 140, and they fit tightly together. Assembly positioning and torque transmission are achieved through the tapered surface fit, without a separate tapered sleeve structure. The second cutter head assembly 174 serves as an add-on structure, directly fixed to the end face of the first cutter head assembly 164 away from the extension portion, and can rotate synchronously with the swivel cutter shaft 140 along with the first cutter head assembly 164. Cutting blades can be arranged on both the first cutter head assembly 164 and the second cutter head assembly 174, together forming a two-stage cutting structure.

[0074] Employing a double-layer modular cutter head structure, the system can cut straw twice during operation, effectively reducing the stubble height in the field and adapting to the agronomic requirements of different regions. Combined with a lowered bearing structure, the cantilever length of the swing cutter shaft 140 is short, resulting in better stress distribution. The entire operating load of the second cutter head assembly 174 is transferred to the swing cutter shaft 140 through the first cutter head assembly 164. With the load application point closer to the bearing support point, the bending stress on the swing cutter shaft 140 remains within a safe range, avoiding the problem of easy damage to the shaft after adding a lower cutter head.

[0075] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this utility model, optionally, the first cutter head assembly 164 includes a first disc body and a first cutting blade. The first disc body is provided with a first mounting hole and an inner conical hole 162. The first cutting blade is mounted on the first disc body through the first mounting hole. The first disc body is connected to the outer conical section 142 of the swivel cutter shaft 140 through the inner conical hole 162. The second cutter head assembly 174 includes a second disc body and a second cutting blade. The second disc body is provided with a second mounting hole. The second cutting blade is mounted on the second disc body through the second mounting hole. The second disc body is fixedly connected to the end face of the first disc body away from the extension portion.

[0076] In this embodiment, the first disc body is the main support component of the first cutter head assembly 164. An inner tapered hole 162 axially penetrates the center of the first disc body. The taper of the inner tapered hole 162 matches the taper of the outer tapered section 142 of the swivel cutter shaft 140. The two tapered surfaces are tightly fitted, achieving assembly positioning and torque transmission between the first disc body and the swivel cutter shaft 140. The outer tapered section 142 is integrally machined from the swivel cutter shaft 140, without a separate tapered sleeve structure. A first mounting hole is radially arranged in the disc body area of ​​the first disc body. The first cutting blade is positioned and fixed through the first mounting hole, ensuring precise installation and a secure and reliable connection. The second disc body is the main support component of the second cutter head assembly 174. A second mounting hole is radially arranged in the disc body area of ​​the second disc body. The second cutting blade is positioned and fixed through the second mounting hole. The upper end face of the second disc body is fitted and fixed to the lower end face of the first disc body, enabling the direct addition of the second cutter head assembly 174 to the original base cutter head.

[0077] The cutting blades are individually fixed to the disc body via corresponding mounting holes, making blade installation and removal convenient. Wear-resistant blades can be replaced individually without requiring complete disassembly of the cutter head assembly, reducing future maintenance costs. The disc body and cutter shaft are connected using a tapered surface fit, ensuring high centering accuracy and uniform load distribution. The disc bodies are layered and fixedly connected, with clear assembly hierarchy. Different specifications of second disc bodies and second cutting blades can be flexibly replaced according to operational needs, adapting to different crushing effects and stubble height requirements.

[0078] Optionally, the first disc body includes a first upper disc body and a first lower disc body, which are axially connected and fixedly joined along the cutting blade shaft 140. A first mounting hole is provided through the mating end faces of the first upper disc body and the first lower disc body. The first cutting blade is radially positioned through the first mounting hole and clamped and fixed between the mating surfaces of the first upper disc body and the first lower disc body. An inner conical hole 162 axially passes through the center of the first upper disc body and the first lower disc body, and the first disc body is integrally connected to the outer conical section 142 of the cutting blade shaft 140 through the inner conical hole 162.

[0079] Optionally, the second disc body includes a second upper disc body and a second lower disc body, which are axially connected and fixedly joined along the blade shaft 140. A second mounting hole is provided through the mating end face of the second upper disc body and the second lower disc body, and the second cutting blade is radially positioned through the second mounting hole and clamped and fixed under the second lower disc body. The end face of the second upper disc body opposite to the second lower disc body is fixedly connected to the end face of the first lower disc body opposite to the first upper disc body, realizing the direct mounting of the second blade assembly 174 on the first blade assembly 164.

[0080] Normal usage condition Figure 1 , Figure 2 , Figure 3 , Figure 4In the single-layer swivel cutter configuration, if a double-layer swivel cutter is required, simply add the second cutter head assembly; the two configurations are easy to switch between.

[0081] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this utility model, optionally, the body 110 includes: a first connecting section 114; an input shaft 116 passing through the first connecting section 114; a first gear 118 sleeved on the input shaft 116 and located inside the first connecting section 114; a second connecting section 120 fixedly connected to the first connecting section 114, the interior of the second connecting section 120 communicating with the interior of the first connecting section 114; a swivel blade shaft 140 disposed inside the second connecting section 120; and a second gear 122 sleeved on the swivel blade shaft 140, the second gear 122 meshing with the first gear 118.

[0082] In this embodiment, the body 110 includes a first connecting section 114, an input shaft 116, a first gear 118, a second connecting section 120, and a second gear 122. The first connecting section 114 is a hollow cylindrical structure. The input shaft 116 passes through the interior of the first connecting section 114 along its axial direction, with one end extending outwards for connecting to external power. The first gear 118 is a bevel gear, fixedly sleeved on the inner end of the input shaft 116, located within the internal cavity of the first connecting section 114. The second connecting section 120 is a hollow cylindrical structure. The sidewall of the second connecting section 120 is connected to the end of the first connecting section 114, and the internal cavity of the second connecting section 120 communicates with the internal cavity of the first connecting section 114. A swivel shaft 140 is disposed within the second connecting section 120 along its axial direction, with the extension direction of the input shaft 116 perpendicular to the extension direction of the swivel shaft 140. The second gear 122 is a bevel gear, which is fixedly sleeved on the upper end of the swivel shaft 140. The second gear 122 meshes with the first gear 118.

[0083] This invention utilizes a pair of meshing bevel gears to achieve vertical power transmission, converting externally input lateral rotational power into vertical rotational power for the cutter shaft 140. This adapts to the lateral power input installation layout of the header and meets the operational requirements of the vertical rotational cutting of the cutter disc 160. The first gear 118 and the second gear 122 are respectively enclosed within the communicating cavities of the first connecting section 114 and the second connecting section 120, preventing field dust and straw debris from entering the gear meshing area, reducing gear wear, and facilitating the filling of lubricating media within the cavities to maintain good gear lubrication and extend the service life of the transmission components. The separate structure of the first connecting section 114 and the second connecting section 120 allows for separate machining of the gear mounting cavity and shaft mounting structure, reducing machining difficulty and facilitating gear assembly and subsequent maintenance.

[0084] Optionally, two support bearings are fitted around the outer periphery of the input shaft 116. The two support bearings are arranged on the side of the first gear 118 away from the gear meshing area and are arranged sequentially along the axial direction of the input shaft 116. The outer ring of the support bearing is fixed to the inner wall of the first connecting section 114 to support the smooth rotation of the input shaft 116.

[0085] Optionally, an oil seal is installed on the inner wall of the outer end of the first connecting section 114. The oil seal is sleeved on the outer periphery of the input shaft 116 to seal the cutter box. The oil seal sleeve can prevent oil leakage from the cutter box and prevent field dust and straw debris from entering the box. Optionally, the first gear 118 is connected to the input shaft 116 by a flat key, and the second gear 122 is connected to the cutter shaft 140 by a flat key to transmit circumferential torque.

[0086] Optionally, an end cap is provided at the upper end of the second connecting section 120. The end cap is fixed to the upper opening of the second connecting section 120 by bolts. The end cap is used to seal the upper cavity of the second connecting section 120.

[0087] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments of this utility model, a harvester is proposed, which includes a knife box 100 as in any of the above embodiments.

[0088] In this embodiment, the harvester proposed by this utility model includes the knife box 100 as in any of the above embodiments, and therefore has the beneficial technical effects of any of the above embodiments.

[0089] In this embodiment, the harvester may specifically be a corn harvester, which is an agricultural harvesting device used in corn planting fields. It can simultaneously complete the integrated operation of picking corn ears and cutting and crushing straw.

[0090] By assembling the shovel box 100 of this invention at the front header of a corn harvester, the stress state of the shovel shaft 140 can be optimized by shortening the axial distance between the bearing 150 and the shovel disc 160. This reduces the probability of fatigue damage to the shovel shaft 140 under the impact load of straw cutting, improves the service life and operational reliability of the straw crushing components, reduces downtime during corn harvester field operations, ensures continuous harvesting, and is suitable for the high-intensity harvesting needs of large-scale corn planting areas. In addition to corn harvesters, this harvester can also be used for wheat harvesters, rice harvesters, and other agricultural harvesting equipment with straw crushing and returning functions.

[0091] The harvester also includes a header frame, a chassis, a powertrain, a conveying mechanism, and a storage bin. The header frame is located at the front of the harvester, and the cutter box 100 is fixedly installed at the lower part of the header frame. The powertrain is located inside the harvester's body, and its power output is connected to the input shaft 116 of the cutter box 100, providing rotational power to the cutter box 100. The chassis is located at the bottom of the harvester, supporting the entire machine and driving it along the field. The conveying mechanism is located between the header frame and the storage bin, transporting the harvested crop fruit to the storage bin for storage. The storage bin is located at the rear of the harvester, temporarily storing the harvested crop fruit.

[0092] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0093] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flail box, characterized in that, include: ontology; An extension is connected to the lower end of the main body; A swivel blade shaft is axially inserted through the body and the extension, with the end of the swivel blade shaft extending out from the lower end of the extension. A bearing, wherein the outer ring of the bearing is disposed on the inner wall of the extension, and the inner ring of the bearing is sleeved on the swivel cutter shaft so that the swivel cutter shaft can rotate relative to the extension; A swivel cutter disc is disposed on the portion of the swivel cutter shaft that extends out of the extension portion. Along the axial direction of the swivel cutter shaft, the axial distance between the bearing and the swivel cutter disc is less than the axial distance between the bearing and the body.

2. The knife-spinning box according to claim 1, characterized in that, The end of the extension that is away from the main body is located near the upper surface of the swivel cutter disc, and the bearing is located near the end of the extension that is away from the main body.

3. The knife-spinning box according to claim 1, characterized in that, The inner wall of the extension is provided with a bearing mounting groove, and the bearing is embedded in the bearing mounting groove.

4. The knife-spinning box according to claim 1, characterized in that, The extension portion is provided with a first snap-fit ​​portion at one end facing the main body; The main body is provided with a second snap-fit ​​portion at one end facing the extension portion, and the first snap-fit ​​portion and the second snap-fit ​​portion are snapped together.

5. The knife-spinning box according to claim 1, characterized in that, The swivel cutter head is connected to the tapered surface of the swivel cutter shaft.

6. The knife-spinning box according to claim 5, characterized in that, The lower end of the swivel shaft is provided with an outer tapered section, and the center of the swivel disc is provided with an inner tapered hole. The taper of the outer tapered section is consistent with the taper of the inner tapered hole, and the outer tapered section and the inner tapered hole fit together.

7. The drag box of claim 6, wherein, The rotary cutter head includes: The first cutter head assembly has an inner conical hole at its center, and the first cutter head assembly is connected to the outer conical section of the swivel cutter shaft through the inner conical hole. The second cutter head assembly is connected to the end face of the first cutter head assembly opposite to the extension.

8. The knife-spinning box according to claim 7, characterized in that, The first tool head assembly includes: A first disc body, wherein the first disc body is provided with a first mounting hole and the inner conical hole; The first cutting blade is mounted on the first disc body through the first mounting hole; The second cutter head assembly includes: The second disc body is provided with a second mounting hole and is connected to the end face of the first disc body that is away from the extension portion. The second cutting blade is mounted on the second disc body through the second mounting hole.

9. The knife-spinning box according to any one of claims 1 to 8, characterized in that, The body includes: First connecting segment; The input shaft passes through the first connecting section; The first gear is sleeved on the input shaft and located inside the first connecting section; The second connecting segment is connected to the first connecting segment, and the interior of the second connecting segment is connected to the interior of the first connecting segment. The swivel blade shaft is disposed inside the second connecting segment. The second gear is sleeved on the swivel shaft, and the second gear meshes with the first gear.

10. A harvester characterized by include: A flail box as claimed in any one of claims 1 to 9.

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