A tool setting device for a brush cutter
By designing the clutch component of the blade adjusting device, the problem of inaccurate adjustment of the distance between the fixed blade plate and the roller blade assembly in the wood chipper was solved, thereby extending the blade life and improving the material crushing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YAT ELECTRICAL APPLIANCE CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-07-14
AI Technical Summary
The distance between the fixed blade and the roller blade assembly in the shredder is difficult to adjust accurately, which leads to a shortened blade life or the material not being effectively crushed, thus failing to meet the waste recycling standards.
The tool setting device uses a clutch component to achieve mechanical limiting design between the fixed blade plate and the hobbing blade assembly, ensuring accurate spacing. The clutch component automatically disengages when in position, avoiding over-adjustment.
It enables precise adjustment of the distance between the fixed blade and the roller cutter assembly, avoiding problems such as blade wear and uncrushed materials, and improving equipment maintenance efficiency and crushing accuracy.
Smart Images
Figure CN224486205U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of blade setting for wood chippers, and in particular to a blade setting device for wood chippers. Background Technology
[0002] When the wood chipper is in operation, branches and wood strips fed into the feed inlet are torn, compressed, and cut into small pieces of wood chips and a large number of fragments by a high-speed rotating cutter assembly with sharp blades. The crushed wood chips and fragments are then discharged from the outlet by gravity and centrifugal force. The wood chips and strips are shredded by a fixed blade of the same length as the cutter assembly, forming a tangential shearing surface. The shearing action is achieved by the cutter assembly rotating with a high torque, driven by a motor and reduced by multiple planetary gears. However, accurately positioning the tangential distance between the fixed blade plate and the roller cutter assembly with sharp blades is difficult because the distance is adjusted by rotating a screw, relying entirely on the user's feel. This results in gaps that are either too large or too small, making it hard to achieve the perfect positioning point. When the tangential surface formed by the fixed blade plate and the roller cutter assembly is too small, the blade will cut the fixed blade plate material (aluminum alloy), leading to a shortened blade life or the risk of blade breakage. When the tangential surface between the fixed blade plate and the roller cutter assembly is too large, fresh branches and wood strips with bark will not be cut by the roller blades when passing through the shearing surface. As a result, the branches that are broken into pieces will still come out of the discharge port as whole pieces of bark-covered branches, failing to meet waste recycling standards and being unsuitable for use as mulch or compost. Utility Model Content
[0003] In order to overcome the shortcomings of the existing technology in which the fixed blade plate and the roller blade assembly of the wood chipper are positioned by hand, this application provides a blade alignment device for the wood chipper that can quickly complete the blade alignment work of the fixed blade plate and the roller blade assembly.
[0004] To achieve the above objectives, this application adopts the following technical solution: a blade-setting device for a wood chipper, the wood chipper including a housing for accommodating a rotary blade assembly, a fixed blade plate pivotally mounted on the housing, the fixed blade plate having a contact end face for cooperating with the blades on the rotary blade assembly to achieve cutting and crushing action on the material, the blade-setting device including an actuating component for driving the fixed blade plate closer to the rotary blade assembly and a driving component for driving the actuating component closer to and pushing the fixed blade plate, a clutch component for separating or connecting the driving component and the actuating component between the driving component and the actuating component, the actuating component being threadedly connected to the housing, one end of the actuating component extending into the housing pushing the fixed blade plate closer to the rotary blade assembly, one end of the actuating component extending out of the housing being connected to a first clutch portion of the clutch component, the driving component being connected to a second clutch portion of the clutch component, when the distance between the fixed blade plate and the rotary blade assembly is not in place, the first clutch portion and the second clutch portion are connected; when the distance between the fixed blade plate and the rotary blade assembly is in place, the first clutch portion and the second clutch portion are separated.
[0005] The tool setting process of the tool setting device is as follows: In the initial state, the distance between the fixed blade plate and the hobbing assembly is not yet in place, and the first clutch part (actuator end) and the second clutch part (drive part) of the clutch component are in a connected state (such as meshing, snap-fit connection, etc.). The operator manually drives the tool setting by rotating the drive component (such as a knob), which drives the actuator to rotate synchronously through the clutch component. Since the actuator is threaded to the housing, it will move axially during rotation, pushing the fixed blade plate closer and closer to the hobbing assembly until the distance between them reaches the preset ideal value (i.e., the blade and the contact end face of the fixed blade plate are just tangent). When the tool setting is in place, the clutch disengages. When the distance between the fixed blade plate and the hobbing assembly reaches the set value, the first clutch part and the second clutch part of the clutch component automatically disengage. At this time, the drive component idles and cannot continue to drive the actuator to rotate, avoiding excessive compression that could damage the blade or fixed blade plate. When the tool setting is completed, the operator will feel the drive component idle (such as a sudden change in feel, a sound when in place, etc.), and can then determine that the tool setting is complete and stop the operation.
[0006] By adopting the above technical solution, this application has the following advantages: The mechanical limiting design of the clutch component replaces the traditional "manual adjustment," ensuring that the distance between the fixed blade plate and the hobbing assembly is always at the ideal value (tangential), avoiding excessive or insufficient clearance. Furthermore, the clutch component automatically disengages when the clearance is correct, preventing the fixed blade plate from constantly applying pressure to the blade after over-adjustment, thus avoiding the blade cutting the fixed blade plate (aluminum alloy material) during operation, reducing blade wear and breakage risks, and extending component life. Compared to traditional manual adjustment, this solution eliminates the need for repeated trial and error adjustments; tool setting can be completed with a single rotation, shortening equipment debugging time, improving maintenance efficiency, and making it especially suitable for novice operators.
[0007] Furthermore, the actuating component is a screw, the first clutch is an outer cover fixedly connected to the outer end of the screw, the inner side of the outer cover is provided with a first driving part, the second clutch includes an inner cover and a push rod penetrating the screw and the outer cover, the outer end of the push rod is connected to the inner cover, the outer side of the inner cover is provided with a second driving part that is circumferentially fixed to the first driving part and axially slidably connected, the driving component is a knob sleeved on the outer side of the inner cover and the outer cover, the knob is rotatably connected to the outer cover, the knob is circumferentially fixed to the inner cover and axially slidably connected, the push rod has a first position in which the inner end extends beyond the inner end of the screw, at which time the first driving part and the second driving part are circumferentially fixed, the push rod has a second position in which the inner end retracts into the inner end of the screw, at which time the first driving part and the second driving part are separated, an elastic element is provided between the inner cover and the knob to keep the push rod in the first position, when the inner cover moves from the first position to the second position, the force of the elastic element is greater than the rotational resistance experienced by the fixed blade plate when rotating.
[0008] Using the aforementioned technical solution, after the fixed blade plate abuts against the roller cutter assembly, the screw continues to screw into the compression elastic element until the push rod switches to the second position (drive part disengages). At this time, the knob rotates freely, and the operator can accurately judge the completion of blade setting by the sudden change in feel (free rotation after compression of the elastic element), without the need for additional measuring tools, thus lowering the operational threshold. When the distance between the fixed blade plate and the roller cutter assembly is in place, the inner end of the push rod contacts the internal limiting structure of the housing (such as a baffle) and is pushed in the opposite direction to the second position, forcing the first drive part to disengage from the second drive part. This avoids the impact or wear of components that may be caused by the instantaneous change in resistance in traditional "pure resistance clutches". The timing of clutch disengagement is directly controlled by the physical stroke limit of the inner end of the push rod, decoupled from external resistance, ensuring that the distance between blades is absolutely consistent each time, which is especially suitable for scenarios with high requirements for crushing precision (such as standardized treatment of garden waste, preparation of biomass energy raw materials, etc.).
[0009] Furthermore, the inner cover has a ring-shaped third driving part on its inner side, and the knob has a ring-shaped fourth driving part that matches the third driving part. The third driving part and the fourth driving part are circumferentially fixed and axially slidably connected.
[0010] Using the aforementioned technical solution, the annular third and fourth drive units are circumferentially fixed and axially slidingly connected, ensuring that when the knob rotates, power can be precisely transmitted to the inner cover, thereby driving the screw and other components to rotate to achieve the tool setting operation. The axial sliding connection design allows the knob to slide relative to the inner cover in the axial direction while driving the inner cover to rotate. This characteristic is crucial during the tool setting process. After the fixed blade plate abuts against the hob assembly, the screw continues to screw into the compression elastic element. At this time, the knob needs to slide axially to accommodate the switch of the push rod from the first position to the second position. The axial sliding design of the annular drive unit provides a smooth way to achieve this process, ensuring the smooth progress of the tool setting process.
[0011] Furthermore, when the push rod is in the first and second positions, both the third and fourth drive units are in a circumferentially fixed connection.
[0012] Using the aforementioned technical solution, when the push rod is in the first position, the knob drives the inner cover to rotate via the third and fourth drive units, which in turn drives the screw to push the fixed blade plate closer to the hobbing assembly. At this time, the circumferential fixed connection ensures lossless power transmission. When the push rod switches to the second position (clutch disengagement), the knob can still drive the inner cover to rotate freely via the annular drive unit, ensuring continuous knob operation while enabling the disengagement of the inner and outer covers. Traditional clutch structures may interrupt power transmission when the push rod position is switched, leading to operational interruption or the need for readjustment. This design, however, achieves "one-stop" tool setting operation through the full circumferential connection of the annular drive unit—from initial adjustment to clutch disengagement and wear reset, all without interrupting the rotational action, significantly improving operational efficiency and user experience.
[0013] Furthermore, the outer cover has an abutment portion on the side near the screw, so that when the push rod is in the first position, the elastic element abuts the inner cover against the abutment portion.
[0014] The principle of this solution is as follows: When the push rod is in the first position (not in contact with the fixed blade plate), the elastic element (such as a spring) pushes the inner cover towards the abutment part through preload, keeping the first drive part (outer cover) and the second drive part (inner cover) in close contact. At this time, when the knob is turned, the inner cover can reliably drive the outer cover and the screw to rotate synchronously. By setting the abutment part at the outer cover, the inner cover has axial limiting in the first position. This also means that the elastic force of the elastic element can be set relatively large, or a large preload can be applied, so that even if the push rod uses an elastic element with a small elastic coefficient, it can overcome the resistance of the fixed blade plate during rotation. Applying a certain preload to the elastic element can also increase its service life. Since tool setting is a periodic operation, if the interval after each tool setting is too long, the elastic force of the elastic element will decrease. By limiting the minimum compression of the elastic element, the long-term stress in the non-working state is reduced, the service life of the elastic element is extended, and the risk of tool setting accuracy degradation due to elastic element aging is reduced.
[0015] Furthermore, the axial distance of the first drive unit is equal to the length of the push rod extending out of the screw when it is in the first position.
[0016] Motion Principle: When the push rod is in the first position (extended screw), the first drive unit (inner side of the outer cover) and the second drive unit (outer side of the inner cover) transmit torque through an axial sliding connection. When the push rod is pushed to the second position (retracted screw) by the fixed blade plate, the axial length of the first drive unit allows it to completely separate from the second drive unit. By adopting the aforementioned technical solution, by binding the clutch distance to the length of the push rod extending from the screw, the tool setting distance will not be inaccurate due to factors such as the decrease in spring force. Even if the inner cover cannot be completely pressed against the side wall of the outer cover after the spring force decreases, the extension distance of the push rod is still limited by the mating distance between the inner and outer covers. Therefore, when the fixed blade plate and the hobbing assembly reach the ideal distance, the push rod immediately triggers the clutch to separate, ensuring the consistency of tool setting accuracy. Secondly, if the axial distance of the first drive unit is set slightly longer, the drive unit may still partially contact the push rod after it retracts, causing a small torque to be transmitted even when the knob is idling. This could cause the screw to continue advancing slightly, resulting in excessive compression between the fixed blade plate and the hobbing assembly, leading to unnecessary movement of the fixed blade plate during operation. Conversely, if the axial distance of the first drive unit is set slightly shorter, the screw may not disengage before pushing the fixed blade plate to the appropriate distance, resulting in an excessively large tool-setting distance between the fixed blade plate and the hobbing assembly.
[0017] Furthermore, the knob consists of a housing and a cover plate. The housing is used to fit over the outside of the screw, the outer cover, and the inner cover. The cover plate conceals the elastic element, the outer end of the screw, the outer end of the push rod, the outer cover, and the inner cover within the housing.
[0018] By adopting the aforementioned technical solution, the outer shell and cover plate form a complete enclosed space, completely shielding precision components such as elastic elements, screws, and push rods, preventing sawdust, dust, or external debris generated during the operation of the wood chipper from entering the clutch mechanism. The drive components of traditional blade setting devices (such as exposed screw knobs) are easily affected by the environment and are inconvenient to maintain. However, this design, through innovative enclosed protection, upgrades the blade setting device from "vulnerable exposed components" to "durable integrated modules".
[0019] Furthermore, an adjusting element is threaded onto the cover plate. One end of the elastic element abuts against the side of the inner cover away from the push rod, and the other end abuts against the adjusting element. The degree of compression of the elastic element is adjusted by rotating the adjusting element.
[0020] Using the aforementioned technical solution, rotating the adjusting component (such as an adjusting bolt) can change the initial compression of the elastic component (such as a spring), thereby adjusting the resistance threshold required for clutch disengagement. When the distance between the fixed blade plate and the hobbing cutter assembly reaches the set value, the resistance from the fixed blade plate on the push rod will gradually overcome the preload of the elastic component, triggering clutch disengagement. As the contact end face of the fixed blade plate wears naturally, the preload of the elastic component will gradually loosen. This solution can also compensate for the gap changes caused by wear by periodically rotating the adjusting component to increase the compression, maintaining tool setting accuracy. The clutch trigger threshold of traditional tool setting devices is fixed and cannot adapt to performance fluctuations caused by tool changes, material changes, or component wear. This design upgrades the tool setting device from "passive adaptation" to "active adjustment" through an adjustable elastic preload mechanism, enabling multi-scenario and multi-position use.
[0021] Furthermore, the cover plate is detachably connected to the outer shell.
[0022] Using the aforementioned technical solution, the cover plate is connected to the outer shell via clips, screws, etc., allowing for quick disassembly. When it is necessary to check the condition of the elastic element, clean internal dust, or replace parts, it is not necessary to disassemble the entire wood chipper; simply opening the cover plate allows access to the internal structure. Traditional blade-setting devices' drive components (such as exposed screw knobs) are susceptible to environmental influences and inconvenient to maintain. However, this design, through the dual innovation of enclosed protection and modular disassembly, upgrades the blade-setting device from a "vulnerable exposed component" to a "durable integrated module."
[0023] Furthermore, the actuating component is a screw, the first clutch part is a first trip seat fixedly connected to the screw, the second clutch component is a second trip seat adapted to the first trip seat, the driving component is a knob rotatably connected to the first trip seat, the knob is provided with a first locking part, the second trip seat is provided with a second locking part adapted to the first locking part, the first locking part and the second locking part are circumferentially fixed and axially slidably connected, the first trip seat and the second trip seat are a plurality of axially inclined inclined surfaces ringed on the end face, and the two are circumferentially fixed by the friction force generated between the inclined surfaces, an elastic element is provided between the knob and the second trip seat, the elastic element is used to increase the contact pressure between the second trip seat and the first trip seat, and when the torque of the screw is greater than the friction force between the second trip seat and the first trip seat, the second trip seat separates from the first trip seat.
[0024] Working Principle: When the distance between the fixed blade plate and the hobbing assembly is not in place, the elastic element (such as a spring) transmits axial pressure to the first release seat through the second release seat, causing the inclined surfaces of the two to fit tightly together. At this time, the torque generated by rotating the knob is transmitted to the screw through the inclined surface friction, driving the screw to advance the fixed blade plate. When the distance reaches the set value, the screw resistance increases sharply, exceeding the inclined surface friction threshold. The second release seat slides out along the inclined surface and separates axially, causing the torque transmission to be interrupted, the knob to spin freely, and automatic clutch engagement / disengagement is achieved. Using the aforementioned technical solution, compared with the push rod design, the release seat directly transmits torque through the snap-fit part, eliminating intermediate components such as push rods and outer covers, resulting in a more compact structure. By adjusting the stiffness and preload of the elastic element, the axial force required for clutch engagement / disengagement can be precisely set, ensuring the consistency of the clearance for each tool setting. For example, for tools with different hardness, the elastic element with the corresponding stiffness can be replaced. This provides better adaptability to different equipment. A noticeable sudden change in feel (such as a "click") occurs at the moment of release, allowing the operator to intuitively judge that the tool setting is complete and reducing misoperation. Attached Figure Description
[0025] The following description, in conjunction with the accompanying drawings, further illustrates this application:
[0026] Figure 1 This is a schematic diagram of a blade-setting device for a wood chipper according to this application;
[0027] Figure 2 An exploded view of a blade-setting device for a wood chipper;
[0028] Figure 3 This is a schematic diagram of the cover plate;
[0029] Figure 4 This is a schematic diagram of the tool setting device in Example 2;
[0030] Figure 5 This is an exploded view of the tool setting device in Example 2.
[0031] Figure Descriptions: 1. Housing; 11. Hob assembly; 12. Fixed blade plate; 121. Contact end face; 2. Actuating component; 21. Screw; 3. Driving component; 4. Clutch component; 41. First clutch part; 42. Second clutch part; 43. Elastic element; 44. First release seat; 45. Second release seat; 46. First locking part; 47. Second locking part; 5. Outer cover; 51. First driving part; 52. Abutting part; 6. Inner cover; 61. Push rod; 62. Second driving part; 63. Third driving part; 7. Knob; 71. Fourth driving part; 72. Outer shell; 73. Cover plate; 74. Adjusting component. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0033] The terms "first," "second," etc. (if present) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this application, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.
[0034] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.
[0035] like Figures 1 to 3As shown, this application provides a blade setting device for a wood chipper. The wood chipper includes a housing 1 for accommodating a rotary cutter assembly 11. A fixed blade plate 12 is pivotally mounted on the housing 1. The fixed blade plate 12 has a contact end face 121 for cooperating with the blades on the rotary cutter assembly 11 to achieve a cutting and crushing action on the material. The blade setting device includes an actuating component 2 for driving the fixed blade plate 12 closer to the rotary cutter assembly 11 and a driving component 3 for driving the actuating component 2 closer to and pushing the fixed blade plate 12. A separation mechanism is provided between the driving component 3 and the actuating component 2 for separating the driving component 3 from the actuating component 2. The clutch component 4 is connected to the actuator 2, which is threadedly connected to the housing 1. One end of the actuator 2 extends into the housing 1 and pushes the fixed blade plate 12 closer to the roller cutter assembly 11. The other end of the actuator 2 extends out of the housing 1 and is connected to the first clutch part 41 of the clutch component 4. The drive component 3 is connected to the second clutch part 42 of the clutch component 4. When the distance between the fixed blade plate 12 and the roller cutter assembly 11 is not in place, the first clutch part 41 and the second clutch part 42 are connected. When the distance between the fixed blade plate 12 and the roller cutter assembly 11 is in place, the first clutch part 41 and the second clutch part 42 are separated.
[0036] The tool setting process of the tool setting device is as follows: In the initial state, the distance between the fixed blade plate 12 and the hobbing assembly 11 is not yet in place, and the first clutch part 41 (end of the actuator 2) and the second clutch part 42 (end of the drive component 3) of the clutch component 4 are in a connected state (such as meshing, snap-fit connection, etc.); the operator manually drives the tool setting, rotating the drive component 3 (such as a knob), which drives the actuator 2 to rotate synchronously through the clutch component 4. Since the actuator 2 is threadedly connected to the housing 1, it will move axially during rotation, pushing the fixed blade plate 12 gradually closer to the hobbing assembly 11, until... The distance between the two reaches the preset ideal value (i.e., the blade and the contact end face 121 of the fixed blade plate 12 are just tangent). When the tool setting is in place, the clutch disengages. When the distance between the fixed blade plate 12 and the hobbing assembly 11 reaches the set value, the first clutch part 41 and the second clutch part 42 of the clutch component 4 automatically disengage. At this time, the drive component 3 idles and cannot continue to drive the actuator 2 to rotate, avoiding excessive compression that could damage the blade or the fixed blade plate 12. When the tool setting is completed, the operator will feel the drive component 3 idle (such as a sudden change in feel, a sound when it is in place, etc.), and can then determine that the tool setting is complete and stop the operation.
[0037] By adopting the above technical solution, this application has the following advantages: The mechanical limiting design of the clutch component 4 replaces the traditional "manual adjustment," ensuring that the distance between the fixed blade plate 12 and the hobbing cutter assembly 11 is always at the ideal value (tangential), avoiding excessive or insufficient clearance. Furthermore, the clutch component 4 automatically disengages when the clearance is in place, preventing the fixed blade plate 12 from constantly applying pressure to the blade after over-adjustment, thus avoiding the blade cutting the fixed blade plate 12 (aluminum alloy material) during operation, reducing blade wear and breakage risks, and extending component life. Compared to traditional manual adjustment, this solution eliminates the need for repeated trial and error adjustments; tool setting can be completed with a single rotation, shortening equipment debugging time, improving maintenance efficiency, and making it especially suitable for novice operators.
[0038] Furthermore, the actuating component 2 is a screw 21, the first clutch part 41 is an outer cover 5 fixedly connected to the outer end of the screw 21, the inner side of the outer cover 5 is provided with a first driving part 51, the second clutch part 42 includes an inner cover 6 and a push rod 61 that passes through the screw 21 and the outer cover 5, the outer end of the push rod 61 is connected to the inner cover 6, the outer side of the inner cover 6 is provided with a second driving part 62 that is circumferentially fixed to the first driving part 51 and axially slidably connected, the driving component 3 is a knob 7 sleeved on the outer side of the inner cover 6 and the outer cover 5, the knob 7 is rotatably connected to the outer cover 5, and the knob 7 is... The inner cover 6 is circumferentially fixed and axially slidably connected. The push rod 61 has a first position where its inner end extends beyond the inner end of the screw 21. At this time, the first driving part 51 and the second driving part 62 are circumferentially fixed. The push rod 61 has a second position where its inner end retracts into the inner end of the screw 21. At this time, the first driving part 51 and the second driving part 62 are separated. An elastic element 43 is provided between the inner cover 6 and the knob 7 to keep the push rod 61 in the first position. When the inner cover 6 moves from the first position to the second position, the force of the elastic element 43 is greater than the rotational resistance experienced by the fixed blade plate 12 during rotation.
[0039] The motion process of this scheme is as follows: When neither the push rod 61 nor the screw 21 is in contact with the fixed blade plate 12, the push rod 61 is in the first position. Then, the knob 7 drives the inner cover 6 to rotate, and the inner cover 6 drives the outer cover 5 and the screw 21 to rotate together and extend into the machine housing 1. When the push rod 61 abuts against the fixed blade plate 12, because the elastic force of the elastic element 43 is greater than the rotational resistance of the fixed blade plate 12, the push rod 61 pushes the fixed blade plate 12 closer to the roller assembly 11. When the fixed blade plate 12 and the roller assembly 11 abut against each other, the push rod 61 cannot move forward, and the screw 21 is in the knob 7 Driven by the screw 21, it continues to extend into the housing 1. At this time, the elastic element 43 is gradually compressed, and the push rod 61 gradually switches from the first position to the second position. When the screw 21 abuts against the fixed blade plate 12, the push rod 61 is in the second position. At this time, the first drive part 51 and the second drive part 62 are separated, so that the driving torque of the knob 7 is cut off between the screw 21. Continuing to rotate the knob 7 will not drive the screw 21 to move forward, so that the screw 21 plays a limiting role on the fixed blade plate 12 and avoids the screw 21 applying redundant pressure to the fixed blade plate 12.
[0040] After the contact end face 121 of the fixed blade plate 12 wears, the gap between the contact end face 121 and the roller cutter assembly 11 increases, reducing the crushing effect of the material. If the first drive part 51 and the second drive part 62 are not aligned at this time, the operator can rotate the knob 7 to align the first drive part 51 and the second drive part 62 during rotation. Then the elastic element 43 will push the push rod 61 inward, and the push rod 61 will push the fixed blade plate 12 onto the roller cutter assembly 11. At this time, the operator can continue to rotate the knob 7 to extend the screw 21 inward, restricting the contact end face 121 of the fixed blade plate 12 to a set position close to the roller cutter assembly 11. The push rod 61 is now in the second position, cutting off the power transmission between the knob 7 and the screw 21, completing the blade alignment process after the fixed blade plate 12 wears.
[0041] Using the aforementioned technical solution, after the fixed blade plate 12 abuts against the roller cutter assembly 11, the screw 21 continues to screw into the compression elastic element 43 until the push rod 61 switches to the second position (drive part disengages). At this time, the knob 7 rotates freely, and the operator can accurately judge the completion of blade setting by the sudden change in feel (free rotation after compression of the elastic element 43), without the need for additional measuring tools, thus lowering the operating threshold. When the distance between the fixed blade plate 12 and the roller cutter assembly 11 is in place, the inner end of the push rod 61 contacts the internal limiting structure (such as a baffle) of the housing 1 and is pushed in the opposite direction to the second position, forcing the first drive part 51 to disengage from the second drive part 62. This avoids the impact or wear of components that may be caused by the instantaneous change in resistance in traditional "pure resistance clutch". The physical stroke limit of the inner end of the push rod 61 directly controls the timing of clutch disengagement, decoupling it from external resistance, ensuring that the distance between blades is absolutely consistent each time, which is especially suitable for scenarios with high requirements for crushing precision (such as standardized treatment of garden waste, preparation of biomass energy raw materials, etc.).
[0042] Specifically, the force of the deformation of the elastic element 43 mentioned above is greater than the rotational resistance experienced by the fixed blade plate 12 during rotation. This means that the frictional resistance experienced by the fixed blade plate 12 during normal rotation during tool setting is less than the resistance of the deformation of the elastic element 43 (e.g., continued compression or continued stretching). The first drive part 51 has a tapered opening groove facing the second drive part 62, while the second drive part 62 has a tapered gear tooth facing the first drive part 51. The number of second drive parts 62 is the same as the number of first drive parts 51, so as to distribute torque and increase service life. The inner end of the push rod 61 and the inner end of the screw 21 refer to the ends of both located inside the housing 1, while the outer end of the push rod 61 and the outer end of the screw 21 refer to the ends of both located outside the housing 1. It can be understood that the elastic element 43 can also be disposed between the outer cover 5 and the inner cover 6. When the inner cover 6 switches from the first position to the second position, the elastic element 43 is stretched.
[0043] Furthermore, the inner cover 6 has a ring-shaped third driving part 63 on its inner side, and the knob 7 has a ring-shaped fourth driving part 71 that is adapted to the third driving part 63. The third driving part 63 and the fourth driving part 71 are circumferentially fixed and axially slidably connected.
[0044] Using the aforementioned technical solution, the annular third drive unit 63 and the fourth drive unit 71 are circumferentially fixed and axially slidably connected, ensuring that when the knob 7 rotates, it can accurately transmit power to the inner cover 6, thereby driving the screw 21 and other components to rotate to achieve the tool setting operation. The axially sliding connection design allows the knob 7 to slide relative to the inner cover 6 in the axial direction while driving the inner cover 6 to rotate. This characteristic is crucial in the tool setting process. After the fixed blade plate 12 abuts against the hobbing assembly 11, the screw 21 continues to screw into the compression elastic element 43. At this time, the knob 7 needs to slide axially to adapt to the switching of the push rod 61 from the first position to the second position. The axial sliding design of the annular drive unit provides a smooth way to achieve this process, ensuring the smooth progress of the tool setting process.
[0045] Specifically, the third drive unit 63 is an external gear located inside the inner cover 6, and this external gear is fixedly connected to the inner cover 6. The fourth drive unit 71 is a structure similar to an internal gear located on the cover of the knob 7. Furthermore, both the aforementioned internal and external gears have a cavity at their axial position to accommodate the elastic element 43, which is used to spring against the inner cover 6 and the knob 7, thereby keeping the inner cover 6 in the first position. It is understood that the third drive unit 63 could also be an internal gear located inside the inner cover 6, and the fourth drive unit 71 could be a matching external gear, which could also achieve the above functions. However, setting the third drive unit 63 as an external gear helps to improve the structural strength of the inner cover 6.
[0046] Furthermore, when the push rod 61 is in the first position and the second position, the third drive unit 63 and the fourth drive unit 71 are both in a circumferentially fixed connection.
[0047] Using the aforementioned technical solution, when push rod 61 is in the first position, knob 7 drives inner cover 6 to rotate via the third and fourth drive units 71, thereby driving screw 21 to push fixed blade plate 12 closer to hobbing assembly 11. At this time, the circumferential fixed connection ensures power transmission without loss. When push rod 61 switches to the second position (clutch disengagement), knob 7 can still drive inner cover 6 to rotate freely via the annular drive unit, ensuring the continuity of knob 7 operation while enabling the disengagement of inner cover 6 and outer cover 5. Traditional clutch structures may interrupt power transmission when push rod 61 switches positions, leading to operation interruption or the need for readjustment. However, this design, through the full circumferential connection of the annular drive unit, achieves "one-stop" tool setting operation—from initial adjustment to clutch disengagement and wear reset, there is no need to interrupt the rotation action, significantly improving operating efficiency and user experience.
[0048] Furthermore, the outer cover 5 is provided with an abutment portion 52 on the side near the screw 21, so that when the push rod 61 is in the first position, the elastic member 43 abuts the inner cover 6 against the abutment portion 52.
[0049] The principle of this scheme is as follows: When the push rod 61 is in the first position (not in contact with the fixed blade plate 1), the elastic element 43 (such as a spring) pushes the inner cover 6 towards the abutment part 52 through preload, so that the first drive part 51 (outer cover) and the second drive part 62 (inner cover) remain tightly fitted. At this time, when the knob 7 is rotated, the inner cover 6 can reliably drive the outer cover 5 and the screw 21 to rotate synchronously. By using the aforementioned technical solution, by setting the abutment part 52 at the outer cover 5, the inner cover 6 has axial limitation in the first position. This also means that the elastic force of the elastic element 43 can be set relatively large, or a large preload can be applied, so that... Even when using an elastic element 43 with a small elastic coefficient, the push rod 61 can overcome the resistance of the fixed blade plate 12 during rotation. Applying a certain preload to the elastic element 43 can also increase its service life. Since tool setting is a highly cyclical task, if the interval between tool setting operations is too long, it can lead to a decrease in the elasticity of the elastic element 43. Furthermore, limiting the minimum compression of the elastic element 43 reduces its long-term stress in non-working states, extends its service life, and reduces the risk of decreased tool setting accuracy due to aging of the elastic element 43.
[0050] Furthermore, the axial distance of the first drive unit 51 is equal to the length of the push rod 61 extending out of the screw 21 when in the first position.
[0051] Motion Principle: When the push rod 61 is in the first position (extending the screw 2), the first drive part 51 (inner side of the outer cover 5) and the second drive part 62 (outer side of the inner cover 6) transmit torque through an axial sliding connection; when the push rod 61 is pushed to the second position (retracting the screw 2) by the fixed blade plate 12, the axial length of the first drive part 51 just allows it to completely separate from the second drive part 62. By adopting the aforementioned technical solution, by binding the clutch distance with the length of the push rod 61 extending from the screw 21, the tool setting distance will not be inaccurate due to the decrease in spring force, etc. Even when the inner cover 6 cannot be completely pressed against the side wall of the outer cover 5 after the spring force decreases, the extension distance of the push rod 61 is still related to the inner cover 6 and the outer cover 5. The distance between the fixed blade plate 12 and the hobbing assembly 11 is limited by the engagement distance. Therefore, when the fixed blade plate 12 and the hobbing assembly 11 reach the ideal distance, the push rod 61 immediately triggers the clutch to disengage, ensuring consistent tool setting accuracy. Secondly, if the axial distance of the first drive unit 51 is set slightly longer, the drive unit may still partially contact after the push rod 61 retracts, causing the knob 7 to transmit a small torque when idling. This may cause the screw 21 to continue to advance slightly, resulting in excessive compression between the fixed blade plate 12 and the hobbing assembly 11, causing the fixed blade plate 12 to generate unnecessary patterns during operation. Conversely, if the axial distance of the first drive unit 51 is set slightly shorter, the screw 21 will not disengage before pushing the fixed blade plate 12 to the appropriate distance, resulting in an excessively large tool setting distance between the fixed blade plate 12 and the hobbing assembly.
[0052] Furthermore, the knob 7 is composed of a housing 72 and a cover plate 73. The housing 72 is used to fit over the outside of the screw 21, the outer cover 5 and the inner cover 6. The cover plate 73 covers the elastic element 43, the outer end of the screw 21, the outer end of the push rod 61, the outer cover 5 and the inner cover 6 within the housing 72.
[0053] Using the aforementioned technical solution, the outer shell 72 and the cover plate 73 form a complete enclosed space, completely shielding precision components such as the elastic element 43, screw 21, and push rod 61, preventing sawdust, dust, or external debris generated during the operation of the wood chipper from entering the clutch mechanism. Traditional blade setting devices have drive components 3 (such as exposed screw 21 knobs) that are susceptible to environmental influences and inconvenient to maintain. This design, through innovative enclosed protection, upgrades the blade setting device from a "vulnerable exposed component" to a "durable integrated module."
[0054] Furthermore, an adjusting member 74 is threadedly connected to the cover plate 73. One end of the elastic member 43 abuts against the side of the inner cover 6 away from the push rod 61, and the other end abuts against the adjusting member 74. The degree of compression of the elastic member 43 is adjusted by rotating the adjusting member 74.
[0055] Using the aforementioned technical solution, the rotating adjustment component 74 (such as an adjusting bolt) can change the initial compression of the elastic component 43 (such as a spring), thereby adjusting the resistance threshold required for clutch disengagement. When the distance between the fixed blade plate 12 and the roller assembly 11 reaches a set value, the resistance from the fixed blade plate 12 on the push rod 61 will gradually overcome the preload of the elastic component 43, triggering clutch disengagement. As the contact end face 121 of the fixed blade plate 12 naturally wears, the preload of the elastic component 43 will gradually loosen. This solution can also compensate for the gap changes caused by wear and maintain tool setting accuracy by periodically rotating the adjustment component 74 to increase the compression. The clutch trigger threshold of traditional tool setting devices is fixed and cannot adapt to performance fluctuations caused by tool replacement, material changes, or component wear. This design upgrades the tool setting device from "passive adaptation" to "active adjustment" through an adjustable elastic preload mechanism, enabling multi-scenario and multi-position use.
[0056] Furthermore, the cover plate 73 is detachably connected to the outer shell 72.
[0057] Using the aforementioned technical solution, the cover plate 73 is connected to the outer casing 72 via clips, screws, or other means, allowing for quick disassembly. When it is necessary to check the condition of the elastic element 43, clean internal dust, or replace parts, it is not necessary to disassemble the entire wood chipper; simply opening the cover plate 73 allows access to the internal structure. Traditional blade-setting devices, such as exposed screws 21 and knobs, are susceptible to environmental influences and inconvenient to maintain. This design, through a dual innovation of enclosed protection and modular disassembly, upgrades the blade-setting device from a "vulnerable exposed component" to a "durable integrated module."
[0058] Example 2:
[0059] like Figures 4 to 5 As shown, the actuating component 2 is a screw 21, the first clutch part 41 is a first release seat 44 fixedly connected to the screw 21, the second clutch part 42 is a second release seat 45 adapted to the first release seat 44, the driving component 3 is a knob 7 rotatably connected to the first release seat 44, the knob 7 is provided with a first locking part 46, and the second release seat 45 is provided with a second locking part 47 adapted to the first locking part 46. The first locking part 46 and the second locking part 47 are circumferentially fixed and axially fixed. In a relative sliding connection, the first trip seat 44 and the second trip seat 45 are several axially inclined inclined surfaces arranged in a ring on the end face, and the two are circumferentially fixed by the friction force generated between the inclined surfaces. An elastic element 43 is provided between the knob 7 and the second trip seat 45. The elastic element 43 is used to increase the contact pressure between the second trip seat 45 and the first trip seat 44. When the torque of the screw 21 is greater than the friction force between the second trip seat 45 and the first trip seat 44, the second trip seat 45 separates from the first trip seat 44.
[0060] Working principle: When the distance between the fixed blade plate 12 and the hobbing cutter assembly 11 is not in place, the elastic element 43 (such as a spring) transmits axial pressure to the first release seat 44 through the second release seat 45, making the inclined surfaces of the two fit tightly together. At this time, the torque generated by rotating the knob 7 is transmitted to the screw 21 through the inclined surface friction, driving the screw 21 to advance the fixed blade plate 12. When the distance reaches the set value, the resistance of the screw 21 increases sharply, exceeding the inclined surface friction threshold. The second release seat 45 slides out along the inclined surface and separates axially, causing the torque transmission to be interrupted. The knob 7 rotates freely, realizing automatic clutch engagement. Using the aforementioned technical solution, compared with the push rod 61 design, the release seat directly transmits torque through the snap-fit part, eliminating intermediate components such as the push rod 61 and the outer cover 5, resulting in a more compact structure. By adjusting the stiffness and preload of the elastic element 43, the axial force required for clutch engagement and disengagement can be precisely set, ensuring the consistency of the gap for each tool setting. For example, for tools with different hardness, the elastic element 43 with the corresponding stiffness can be replaced. This provides better adaptability to different equipment. The moment the clip is released, there will be a noticeable change in feel (such as a "click" sound), which allows the operator to intuitively judge that the tool setting is complete and reduce misoperation.
[0061] In addition to the preferred embodiments described above, this application has other implementation methods. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection claimed in this application.
Claims
1. A blade-setting device for a wood chipper, the wood chipper comprising a housing (1) for accommodating a rotary blade assembly (11), wherein a fixed blade plate (12) is pivotally mounted on the housing (1), the fixed blade plate (12) having a contact end face (121) for engaging with blades on the rotary blade assembly (11) to achieve a cutting and crushing action on the material, characterized in that, The tool setting device includes an actuating component (2) that drives the fixed blade plate (12) close to the hobbing assembly (11) and a driving component (3) that drives the actuating component (2) close to and pushes the fixed blade plate (12). A clutch component (4) for separating or connecting the driving component (3) and the actuating component (2) is provided between the driving component (3) and the actuating component (2). The actuating component (2) is threadedly connected to the housing (1). One end of the actuating component (2) extending into the housing (1) pushes the fixed blade plate (12) close to the hobbing assembly (11). The execution component (2) extends out of the housing (1) and is connected to the first clutch part (41) of the clutch component (4). The drive component (3) is connected to the second clutch part (42) of the clutch component (4). The clutch component (4) is configured such that when the distance between the fixed blade plate (12) and the hobbing assembly (11) is not in place, the first clutch part (41) and the second clutch part (42) are connected; when the distance between the fixed blade plate (12) and the hobbing assembly (11) is in place, the first clutch part (41) and the second clutch part (42) are separated.
2. The blade-setting device for a wood chipper according to claim 1, characterized in that, The actuator (2) is a screw (21). The first clutch (41) is an outer cover (5) fixedly connected to the outer end of the screw (21). The inner side of the outer cover (5) is provided with a first drive part (51). The second clutch (42) includes an inner cover (6) and a push rod (61) that passes through the screw (21) and the outer cover (5). The outer end of the push rod (61) is connected to the inner cover (6). The outer side of the inner cover (6) is provided with a second drive part (62) that is circumferentially fixed to the first drive part (51) and axially slidably connected to it. The drive component (3) is sleeved on the outer side of the inner cover (6) and the outer cover (5). The knob (7) is rotatably connected to the outer cover (5). The knob (7) is circumferentially fixed and axially slidably connected to the inner cover (6). The push rod (61) has a first position where the inner end extends beyond the inner end of the screw (21). At this time, the first drive part (51) and the second drive part (62) are circumferentially fixed relative to each other. The push rod (61) has a second position where the inner end retracts into the inner end of the screw (21). At this time, the first drive part (51) and the second drive part (62) are separated. An elastic element (43) is provided between the inner cover (6) and the knob (7) to keep the push rod (61) in the first position.
3. The blade-setting device for a wood chipper according to claim 2, characterized in that, The inner cover (6) has a third driving part (63) on its inner side, and the knob (7) has a fourth driving part (71) that is adapted to the third driving part (63). The third driving part (63) and the fourth driving part (71) are circumferentially fixed and axially slidably connected.
4. The blade-setting device for a wood chipper according to claim 3, characterized in that, When the push rod (61) is in the first position and the second position, the third drive unit (63) and the fourth drive unit (71) are both in a circumferentially relatively fixed connection.
5. A blade-setting device for a wood chipper according to claim 2, characterized in that, The outer cover (5) has an abutment portion (52) on the side near the screw (21) so that when the push rod (61) is in the first position, the elastic element (43) abuts the inner cover (6) against the abutment portion (52).
6. A blade-setting device for a wood chipper according to claim 2, characterized in that, The axial distance of the first drive unit (51) is equal to the length of the push rod (61) extending out of the screw (21).
7. A blade-setting device for a wood chipper according to claim 2, characterized in that, The knob (7) consists of a housing (72) and a cover plate (73). The housing (72) is used to fit over the outside of the screw (21), the outer cover (5) and the inner cover (6). The cover plate (73) covers the elastic element (43), the outer end of the screw (21), the outer end of the push rod (61), the outer cover (5) and the inner cover (6) within the housing (72).
8. A blade-setting device for a wood chipper according to claim 7, characterized in that, An adjusting member (74) is threaded onto the cover plate (73). One end of the elastic member (43) abuts against the side of the inner cover (6) away from the push rod (61), and the other end abuts against the adjusting member (74). The degree of compression of the elastic member (43) is adjusted by rotating the adjusting member (74).
9. A blade-setting device for a wood chipper according to claim 7, characterized in that, The cover plate (73) is detachably connected to the outer shell (72).
10. A blade-setting device for a wood chipper according to claim 1, characterized in that, The actuating component (2) is a screw (21), the first clutch part (41) is a first release seat (44) fixedly connected to the screw (21), the second clutch part (42) is a second release seat (45) adapted to the first release seat (44), the driving component (3) is a knob (7) rotatably connected to the first release seat (44), the knob (7) is provided with a first locking part (46), the second release seat (45) is provided with a second locking part (47) adapted to the first locking part (46), and the first locking part (46) and the second locking part (47) are circumferentially fixed. The first trip seat (44) and the second trip seat (45) are fixed and axially relative sliding connections. The first trip seat (44) and the second trip seat (45) are several axially inclined inclined surfaces ringed on the end face. The two are circumferentially fixed by the friction force generated between the inclined surfaces. An elastic element (43) is provided between the knob (7) and the second trip seat (45). The elastic element (43) is used to increase the contact pressure between the second trip seat (45) and the first trip seat (44). When the torque of the screw (21) is greater than the friction force between the second trip seat (45) and the first trip seat (44), the second trip seat (45) and the first trip seat (44) separate.