A wood chipper with feeding and crushing blade shaft linkage

Abstract

This utility model discloses a wood chipper with a feeding and crushing cutter shaft linkage. It includes a cutting cutter shaft rotatably mounted inside the cutter box, with a clutch and a primary small sprocket connected to the other side of the cutting cutter shaft; a feeding roller rotatably mounted inside the cutter box, with its shaft connected to a secondary large sprocket; a primary large sprocket, a secondary small sprocket, a secondary large sprocket, and a tertiary small sprocket rotatably mounted on the outer wall of the cutter box; the primary large sprocket and the secondary small sprocket rotate synchronously; the secondary large sprocket and the tertiary small sprocket rotate synchronously; the primary small sprocket is chain-driven with the primary large sprocket, the secondary small sprocket is chain-driven with the secondary large sprocket, and the tertiary small sprocket is chain-driven with the tertiary large sprocket; the feeding roller and the cutting cutter shaft are mechanically transmitted through a sprocket and chain speed reduction mechanism. The sprocket and chain transmission structure is simple, low-cost, and has minimal impact from wood chips and other contaminants on the transmission, making it more suitable for the working environment of a wood chipper.

Description

Technical Field

[0001] This utility model relates to the field of agricultural and garden machinery technology, and in particular to a wood chipper that links the feeding and crushing blade shaft. Background Technology

[0002] A wood chipper uses a high-speed rotating cutting disc to cut wood that enters the blade box, thus achieving the purpose of shredding wood. Currently, wood chippers are fed by gravity or mechanical forced feeding. Mechanical forced feeding, with its controllable feeding speed, is gradually becoming the mainstream method for wood chippers.

[0003] Chinese Patent Publication No. CN 217648574 U discloses a hydraulic feeding mechanism for a wood chipper. A first hydraulic motor drives a second hydraulic motor to rotate, which in turn drives a floating feed roller. The combined operation of the first hydraulic motor and the floating feed roller conveys the wood. Simultaneously, the use of a swing arm and a tension spring causes the swing arm to move the second hydraulic motor and the floating feed roller up and down, facilitating the conveying of wood of different diameters and enabling the device to continuously feed wood. When feeding coarse wood, there will be no wood rebound or wood getting stuck in the cutter box, causing the engine to stall.

[0004] However, controlling the feeding speed with a hydraulic device is costly, involves complex component configurations, and requires regular hydraulic oil replacement, resulting in high operating costs. Utility Model Content

[0005] The purpose of this invention is to provide a wood chipper that links the feeding and crushing blade shaft in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions: A wood chipper with feeding and crushing blade shaft linkage includes a support frame, a blade box is installed on one side of the upper end face of the support frame, a power output device is installed on the other side of the support frame, and a drive pulley is installed on the output shaft of the power output device.

[0007] The cutting shaft is rotated inside the tool box. One end of the cutting shaft passes through the side wall of the tool box and is connected to the driven pulley of the cutting shaft. The driven pulley of the cutting shaft and the driving pulley transmit power through a transmission belt.

[0008] The end of the cutting blade shaft away from the driven pulley passes through the side wall of the tool box and connects to the clutch shaft. A small sprocket is set on one side of the clutch.

[0009] The tool box has a rotating groove on its side wall. An arc-shaped plate is slidably installed on the outside of the rotating groove. A swing arm is installed on the side of the arc-shaped plate away from the tool box. The end of the swing arm away from the arc-shaped plate is rotatably installed on the outer wall of the tool box.

[0010] Inside the toolbox, on the side away from the cutting tool shaft, a feed roller is rotatably installed. Both ends of the feed roller are rotatably mounted on an arc plate. One end of the feed roller passes through the arc plate and the swing arm, and then the shaft connects to a three-stage large sprocket.

[0011] The primary small sprocket and the tertiary large sprocket are connected by a secondary or tertiary reduction chain drive.

[0012] Furthermore, the clutch is a centrifugal clutch. When the cutting shaft speed is lower than the preset value, the clutch and the first-stage small sprocket stop rotating synchronously with the cutting shaft.

[0013] Furthermore, the clutch includes a clutch bushing and a clutch housing. A clutch core is installed between the clutch bushing and the clutch housing. Several sprockets are installed inside the clutch core. Adjacent sprockets are connected by a spring. A retaining ring and a bearing are installed in sequence on the other side of the clutch housing. A small sprocket is installed inside the bearing, and a bearing seat is installed on the outside of the bearing.

[0014] Furthermore, a transition sprocket shaft is rotatably mounted on the outer wall of the toolbox, connecting a secondary small sprocket and a primary large sprocket. The secondary small sprocket and the primary large sprocket rotate in the same direction with the same angular velocity. A secondary large sprocket and a tertiary small sprocket are rotatably mounted on the outer wall of the toolbox, coaxial and rotating in the same direction with the same angular velocity. The primary small sprocket is chain-driven with the primary large sprocket, the secondary small sprocket is chain-driven with the secondary large sprocket, and the tertiary small sprocket is chain-driven with the tertiary large sprocket.

[0015] Furthermore, the secondary large sprocket and the tertiary small sprocket are mounted on the outer wall of the cutter box via the cutting blade shaft, and the angular velocities of the secondary large sprocket and the tertiary small sprocket are different from those of the cutting blade shaft.

[0016] Furthermore, the end of the transition sprocket shaft furthest from the primary sprocket has a threaded hole along the axial direction. A matching threaded rod is installed in the threaded hole. One end of the threaded rod is installed in the threaded hole of the transition sprocket shaft, and the other end of the threaded rod passes through the side wall of the tool box and the compression spring and is connected to a nut. By adjusting the position of the nut on the threaded rod, the pressure of the compression spring acting on the transition sprocket shaft can be adjusted.

[0017] Furthermore, a protective cover is installed on one side of the wood chipper, and the cover and the side wall of the blade box protect the first-stage small sprocket, the first-stage large sprocket, the second-stage small sprocket, the second-stage large sprocket, the third-stage small sprocket, the third-stage large sprocket, and the transmission chain.

[0018] Furthermore, the transition sprocket shaft passes through the first-stage large sprocket and extends outward, with the end of the transition sprocket shaft forming a specific cross-sectional shape; at the position corresponding to the end of the transition sprocket shaft, a through hole is opened on the guard; the wood chipper also includes a crank handle, which is L-shaped in general, with a groove at one end of the crank handle corresponding to the shape of the end of the transition sprocket shaft, so that the transition sprocket shaft can be rotated by the crank handle.

[0019] Furthermore, a hanging ear is fixedly installed on the protective cover, and the crank handle can be placed on the hanging ear.

[0020] The beneficial effects are: 1. The feeding roller and the cutting blade shaft of this utility model are driven by a multi-stage sprocket and chain drive to reduce speed, thereby realizing the mechanical transmission between the feeding roller and the cutting blade shaft. The sprocket and chain drive structure is simple, the cost is low, and the impact of pollutants such as wood chips on the transmission is small, making it more suitable for the working environment of wood chippers.

[0021] 2. By setting up a clutch, when the cutting blade shaft speed decreases, the centrifugal clutch engages, causing the primary sprocket to stop rotating synchronously with the cutting blade shaft. Combined with the friction force applied by the compression spring on the transition sprocket shaft, the rotation speed of the feed roller is reduced more quickly, thereby reducing the amount of wood entering the blade box and reducing the risk of blade jamming.

[0022] 3. By setting a crank handle, when the wood is stuck under the feed roller, the transition sprocket can be rotated in the opposite direction to gradually remove the wood from under the feed roller. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a wood chipper with feeding and crushing blade shaft linkage in the absence of a protective cover, provided by this utility model; Figure 2 This is a front view structural diagram of a wood chipper with a feeding and crushing blade shaft linkage provided by this utility model; Figure 3 This is a schematic diagram of a wood chipper sprocket drive structure that links the feeding and crushing blade shaft, provided by this utility model; Figure 4 This is a schematic diagram of the overall structure of a wood chipper with a linkage between the feeding and crushing blade shaft provided by this utility model; Figure 5 This is an exploded view of the installation structure of the primary large sprocket and the secondary small sprocket of a wood chipper that links the feeding and crushing blade shaft, as provided by this utility model. Figure 6 This is a schematic diagram of a wood chipper clutch structure that links the feeding and crushing blade shaft, as provided by this utility model.

[0024] The reference numerals in the attached diagram are explained as follows: 1. Tool box; 2. Top cover; 3. Feed hopper; 4. Power output device; 41. Drive pulley; 5. Transmission belt; 6. Driven pulley of the cutter shaft; 7. Swing arm; 8. Feed roller; 9. Clutch; 10. First-stage small sprocket; 11. First-stage large sprocket; 12. Second-stage small sprocket; 13. Second-stage large sprocket; 14. Third-stage small sprocket; 15. Third-stage large sprocket; 16. Cutting cutter shaft; 17. Protective cover; 18. Crank handle; 19. Hanging lug; 20. Connecting rod; 21. Arc plate; 102. Intermediate sprocket bushing; 103. Bearing housing one; 104. Bearing one; 105. Transition sprocket bracket; 106. Transition sprocket shaft; 107. Compression spring; 108. Threaded rod; 109. Nut; 201. Clutch bushing; 202. Clutch housing; 204. Throwing block; 205. Spring one; 206. Bearing housing two; 207. Bearing two; 208. Snap ring; 209. Clutch core. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] The present invention will be further described below with reference to the accompanying drawings: like Figures 1 to 3 As shown, a wood chipper with feeding and crushing blade shaft linkage is disclosed. The wood chipper includes a support at the bottom, a blade box 1 is installed on one side of the upper end face of the support, and a power output device 4 is installed on the other side of the upper end face of the support. A drive pulley 41 is installed on the output shaft of the power output device 4 to output rotational power.

[0028] A feed hopper 3 is provided on one side of the cutter box 1, and a discharge port is provided on the side of the cutter box 1 away from the feed hopper 3. A cover 2 is installed on the upper part of the cutter box 1. The side of the cover 2 near the feed hopper 3 is hinged to the cutter box 1, and the other side of the cover 2 is connected to the cutter box 1 by a spiral fastener. A cutting shaft 16 is rotatably installed in the part of the cutter box 1 near the discharge port. A crushing disc is installed on the cutting shaft 16. One end of the cutting shaft 16 passes through the side wall of the cutter box 1 and is then connected to the driven pulley 6. The driven pulley 6 and the driving pulley 41 transmit power through a transmission belt 5. The end of the cutting shaft 16 away from the driven pulley 6 passes through the side wall of the cutter box 1 and is connected to the clutch 9 shaft. The clutch 9 is a centrifugal clutch, and a small sprocket 10 is provided on one side of the clutch 9.

[0029] The tool box 1 has a rotating groove on its corresponding side wall. An arc plate 21 is slidably installed on the outside of the rotating groove. A swing arm 7 is installed on the side of the arc plate 21 away from the tool box 1. The end of the swing arm 7 away from the arc plate 21 is rotatably installed on the outer wall of the tool box 1. The swing arms 7 on both sides of the tool box 1 are connected by a connecting rod 20. The connecting rod 20 is U-shaped in general.

[0030] Inside the cutter box 1, near the feed hopper, a feed roller 8 is rotatably mounted. Several pressure teeth are installed on the circumference of the feed roller 8. The two ends of the feed roller 8 are respectively rotatably mounted on the arc plate 21 through the rotating groove. The end of the feed roller 8 away from the cutter shaft driven pulley 6 passes through the arc plate 21 and the swing arm 7, and is then connected to the three-stage large sprocket 15.

[0031] When using the wood chipper, start the power output device 4. Power is transmitted through the drive pulley 41, transmission belt 5, and driven pulley 6 of the cutter shaft, driving the cutting shaft 16, the first-stage small sprocket 10, the third-stage large sprocket 15, and the feed roller 8 to rotate. The wood to be crushed enters the cutter box 1 from the feed hopper 3. At this time, the pressure teeth on the feed roller 8 will press down on the wood. The swing arm 7 will rotate at different angles depending on the diameter of the wood. Through the rotation of the feed roller 8, the wood is driven into the inside of the cutter box 1. The cutting shaft 3 rotating inside the cutter box 1 crushes the wood. The crushed wood particles are discharged from the discharge port.

[0032] like Figure 5 As shown, a transition sprocket bracket 105 is bolted to the side wall of the tool box 1. The transition sprocket bracket 105 has a through hole, and a bearing seat 103 is installed in the hole. Two bearings 104 are installed in the bearing seat 103, and a transition sprocket shaft 106 is installed in the bearings 104. The two bearings 104 can improve the concentricity and perpendicularity of the transition sprocket shaft 106. One end of the transition sprocket shaft 106 passes through the intermediate sprocket bushing 102 and then connects to the secondary small sprocket 12 and the primary large sprocket 11. The transition sprocket shaft 106, the secondary small sprocket 12, and the primary large sprocket 11 rotate synchronously.

[0033] like Figure 1 , Figure 3As shown, a secondary large sprocket 13 and a tertiary small sprocket 14 are rotatably mounted on the cutting blade shaft 16. The secondary large sprocket 13 and the tertiary small sprocket 14 are coaxial and rotate at the same angular velocity. It should be noted that the secondary large sprocket 13 and the tertiary small sprocket 14 do not rotate synchronously with the cutting blade shaft 16. This is only to save space on the outside of the blade box 1 and make the overall structure of the wood chipper more compact. In this embodiment, the secondary large sprocket 13 and the tertiary small sprocket 14 are mounted on the cutting blade shaft 16. That is to say, the secondary large sprocket 13 and the tertiary small sprocket 14 can also be rotatably mounted on the outer wall of the blade box 1 on the same side as the primary small sprocket 10.

[0034] In one embodiment of this utility model, the power transmission between the first-stage small sprocket 10 and the third-stage large sprocket 15 is as follows: the first-stage small sprocket 10 and the first-stage large sprocket 11 are chain-driven; the first-stage large sprocket 11 and the second-stage small sprocket 12 are coaxial and rotate in the same direction with the same angular velocity; the second-stage small sprocket 12 and the second-stage large sprocket 13 are chain-driven; the second-stage large sprocket 13 and the third-stage small sprocket 14 are coaxial and rotate in the same direction with the same angular velocity; the third-stage small sprocket 14 and the third-stage large sprocket 15 are chain-driven; and the third-stage large sprocket 15 is connected to the feed roller 8 shaft and rotates in the same direction with the same angular velocity.

[0035] In another embodiment of this utility model, the power transmission between the first-stage small sprocket 10 and the third-stage large sprocket 15 is as follows: the first-stage small sprocket 10 is chain-driven with the first-stage large sprocket 11; the first-stage large sprocket 11 is coaxial with the second-stage small sprocket 12 and rotates in the same direction with the same angular velocity; the second-stage small sprocket 12 and the third-stage large sprocket 15 are chain-driven; and the third-stage large sprocket 15 is connected to the feed roller 8 shaft and rotates with the same angular velocity.

[0036] Understandably, in a wood chipper, the cutting blade shaft 16 rotates at high speed to cut the wood entering the blade box, while the feed roller 8 mainly forces feeding and rotates at a lower speed. Between the cutting blade shaft 16 and the feed roller 8, that is, between the three-stage large sprocket 15 and the first-stage small sprocket 10, power can be transmitted through the second-stage sprocket and chain reduction; or through the third-stage sprocket and chain reduction.

[0037] To protect the staff and prevent debris from entering the gaps between the primary small sprocket 10, primary large sprocket 11, secondary small sprocket 12, secondary large sprocket 13, tertiary small sprocket 14, tertiary large sprocket 15 and the chain drive, a protective cover 17 is installed on one side of the tool box 1.

[0038] When the wood chipper is working normally, the cutting shaft 16 rotates at high speed, crushing the wood in the blade box 1. At this time, the primary sprocket 10, clutch 9, and cutting shaft 16 rotate synchronously on the same axis. When there is a risk of the wood chipper jamming, the speed of the cutting shaft 16 decreases, and the centrifugal clutch 9 engages. At this time, the primary sprocket 10 and clutch 9 do not rotate with the cutting shaft 16. That is, the power output by the power output device 4 is transmitted to the cutting shaft 16 through the driving pulley 41, transmission belt 5, and driven pulley 6 of the blade shaft. The cutting shaft 16 rotates, crushing the wood inside the blade box 1. However, at this time, the primary sprocket 10 does not rotate with the cutting shaft 16. Since the feed roller 8 transmits power through the primary sprocket 10, the speed of the feed roller 8 gradually decreases, reducing the amount of wood entering the blade box 1 and reducing the risk of the cutting shaft 16 jamming.

[0039] like Figure 6 As shown, the clutch 9 includes a clutch bushing 201 and a clutch housing 202. A clutch core 209 is installed between the clutch bushing 201 and the clutch housing 202. Several sprockets 204 are installed inside the clutch core 209. The sprockets 204 are connected to each other by a spring 205. A retaining ring 208 and a bearing 207 are installed in sequence on the other side of the clutch housing 202. A small sprocket 10 is installed inside the bearing 207. A bearing seat 206 is installed on the outside of the bearing 207.

[0040] When using a wood chipper to crush wood, if the diameter of the wood fed into the cutter box 1 from the feed hopper 3 is large, the load on the power output device 4 increases. At this time, the speed of the cutting shaft 16 decreases. However, it takes some time for the speed of the cutting shaft 16 to decrease to the point where the clutch 9 engages. In addition, due to the inertia of the first-stage small sprocket 10, the first-stage large sprocket 11, the second-stage small sprocket 12, the second-stage large sprocket 13, the third-stage small sprocket 14, and the third-stage large sprocket 15, the feed roller 8 will continue to rotate, causing the wood in the feed hopper 3 to continue to enter the cutter box 1. The rotational resistance of the cutting shaft 16 continues to increase. Even a short-term overload may still be a malfunction of the power output device 4.

[0041] like Figure 1 , Figure 5 As shown, in order to reduce the harm caused by sprocket inertia, a damping device is installed on the transition sprocket shaft 106. Specifically, a threaded hole is opened along the axial direction at the end of the transition sprocket shaft 106 away from the first-stage large sprocket 11. A matching threaded rod 108 is installed in the threaded hole. One end of the threaded rod 108 is installed in the threaded hole of the transition sprocket shaft 106, and the other end of the threaded rod 108 passes through the side wall of the tool box 1 and the compression spring 107 and connects to the nut 109. By adjusting the position of the nut 109 on the threaded rod 108, the pressure of the compression spring 107 acting on the transition sprocket shaft 106 can be adjusted, thereby reducing the harm caused by sprocket inertia.

[0042] like Figures 1 to 5 As shown, during the operation of the wood chipper, if the power output device 4 stops outputting power due to improper operation or other reasons, the wood will be pressed under the feed roller 8. If the operator forcibly pulls the wood out of the feed hopper 3, it is very likely to damage the feed roller 8. In order to solve the unexpected situation of the wood being pressed under the feed roller 8, the transition sprocket shaft 106 passes through the left end face of the first-stage large sprocket 11 and extends outward, forming a specific cross-sectional shape at the end. The cross-sectional shape can be hexagonal, square or other specific shapes. Correspondingly, a through hole is opened on the guard 17 and equipped with a crank handle 18. The crank handle 18 is L-shaped in general. One end of the crank handle 18 has a groove corresponding to the shape of the end of the transition sprocket shaft 106. Correspondingly, a hanging ear 19 is fixedly installed on the guard 17. When the crank handle 18 is not in use, the crank handle 18 is placed on the hanging ear 19.

[0043] When an unexpected situation occurs where the wood is pressed under the feed roller 8, the groove of the crank handle 18 is installed at the end of the transition sprocket shaft 106. Rotating the crank handle 18 causes the feed roller 8 to reverse through the sprocket drive, and the wood gradually comes out of the feed roller 8.

[0044] When using the wood chipper, start the power output device 4, which transmits power through the drive pulley 41, transmission belt 5, and driven pulley 6 of the cutter shaft. This drives the cutting cutter shaft 16, primary small sprocket 10, primary large sprocket 11, secondary small sprocket 12, secondary large sprocket 13, tertiary small sprocket 14, tertiary large sprocket 15, and feed roller 8 to rotate, feeding the wood to be crushed from the feed hopper 3. The feed roller 8 will press down on the wood, and through the rotation of the feed roller 8, the wood is fed into the cutter box 1.

[0045] During the operation of the wood chipper, if the rotational speed of the cutting blade shaft 16 decreases, which poses a risk of jamming, the clutch 9 engages. The cutting blade shaft 16 cannot transmit power to the primary small sprocket 10. In addition, the compression spring 107 increases the rotational resistance of the transition sprocket shaft 106. The rotational speeds of the primary small sprocket 10, primary large sprocket 11, secondary small sprocket 12, secondary large sprocket 13, tertiary small sprocket 14, tertiary large sprocket 15, and feed roller 8 continuously decrease. The speed at which the wood enters the blade box 1 through the feed hopper 3 decreases, reducing the risk of the cutting blade shaft 16 getting jammed.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A wood chipper with feed and cutter shaft linkage, comprising a support, a cutter box (1) is installed on one side of the upper end surface of the support, a power output device (4) is installed on the other side of the support, characterized in that: A drive pulley (41) is installed on the output shaft of the power output device (4). A cutting shaft (16) is rotatably installed inside the tool box (1). One end of the cutting shaft (16) passes through the side wall of the tool box (1) and is connected to the driven pulley (6). The driven pulley (6) and the driving pulley (41) transmit power through the transmission belt (5). The end of the cutting shaft (16) away from the driven pulley (6) passes through the side wall of the tool box (1) and is connected to the clutch (9) shaft. A small sprocket (10) is provided on one side of the clutch (9). A rotating groove is opened on the side wall corresponding to the tool box (1). An arc plate (21) is slidably installed on the outside of the rotating groove. A swing arm (7) is installed on the side of the arc plate (21) away from the tool box (1). The end of the swing arm (7) away from the arc plate (21) is rotatably installed on the outer wall of the tool box (1). Inside the toolbox (1), a feed roller (8) is rotatably installed on the side away from the cutting blade shaft (16). The two ends of the feed roller (8) are rotatably mounted on the arc plate (21). One end of the feed roller (8) passes through the arc plate (21) and the swing arm (7) and is then connected to the three-stage large sprocket (15). The primary small sprocket (10) and the tertiary large sprocket (15) are connected by a secondary or multi-stage reduction chain drive.

2. A wood chipper according to claim 1 wherein: The clutch (9) is a centrifugal clutch. When the speed of the cutting shaft (16) is lower than the preset value, the clutch (9) and the first-stage small sprocket (10) stop rotating synchronously with the cutting shaft (16).

3. A feed and knife shaft linked wood chipper as claimed in claim 2 wherein: The clutch (9) includes a clutch bushing (201) and a clutch housing (202). A clutch core (209) is installed between the clutch bushing (201) and the clutch housing (202). Several sprockets (204) are installed inside the clutch core (209). Adjacent sprockets (204) are connected by a spring (205). A snap ring (208) and a bearing (207) are installed on the other side of the clutch housing (202). A small sprocket (10) is installed inside the bearing (207). A bearing seat (206) is installed on the outside of the bearing (207).

4. A wood chipper according to claim 1 wherein: A transition sprocket shaft (106) is rotatably mounted on the outer wall of the tool box (1). The transition sprocket shaft (106) is connected to the secondary small sprocket (12) and the primary large sprocket (11). The secondary small sprocket (12) and the primary large sprocket (11) rotate in the same direction with the same angular velocity. A secondary large sprocket (13) and a tertiary small sprocket (14) are rotatably mounted on the outer wall of the tool box (1). The secondary large sprocket (13) and the tertiary small sprocket (14) are coaxial and rotate in the same direction with the same angular velocity. The primary small sprocket (10) is chain-driven with the primary large sprocket (11), the secondary small sprocket (12) is chain-driven with the secondary large sprocket (13), and the tertiary small sprocket (14) is chain-driven with the tertiary large sprocket (15).

5. A feed and knife shaft linked wood chipper as claimed in claim 4 wherein: The secondary large sprocket (13) and the tertiary small sprocket (14) are mounted on the outer wall of the cutter box (1) via the cutting blade shaft (16). The angular velocities of the secondary large sprocket (13) and the tertiary small sprocket (14) are different from those of the cutting blade shaft (16).

6. A feed and knife shaft linked wood chipper as claimed in claim 5 wherein: The end of the transition sprocket shaft (106) away from the first-stage large sprocket (11) has a threaded hole along the axial direction. A matching threaded rod (108) is installed in the threaded hole. One end of the threaded rod (108) is installed in the threaded hole of the transition sprocket shaft (106). The other end of the threaded rod (108) passes through the side wall of the tool box (1) and the compression spring (107) and is connected to the nut (109). By adjusting the position of the nut (109) on the threaded rod (108), the pressure of the compression spring (107) acting on the transition sprocket shaft (106) can be adjusted.

7. A feed and knife shaft linked wood chipper as claimed in claim 5 wherein: A guard (17) is installed on one side of the wood chipper. The guard (17) and the side wall of the blade box (1) protect the first-stage small sprocket (10), the first-stage large sprocket (11), the second-stage small sprocket (12), the second-stage large sprocket (13), the third-stage small sprocket (14), the third-stage large sprocket (15) and the transmission chain.

8. A feed and knife shaft linked wood chipper as claimed in claim 7 wherein: The transition sprocket shaft (106) passes through the first-stage sprocket (11) and extends outward. The end of the transition sprocket shaft (106) forms a hexagonal or square cross-sectional shape. At the position corresponding to the end of the transition sprocket shaft (106), the guard (17) has a through hole. The wood chipper also includes a crank handle (18), which is L-shaped. One end of the crank handle (18) has a groove corresponding to the shape of the end of the transition sprocket shaft (106). The transition sprocket shaft (106) can be rotated by the crank handle (18).

9. A feed and pulverizing knife shaft linked wood chipper according to claim 8, characterized in that: The protective cover (17) is fixedly installed with a hanging ear (19), and the crank (18) can be placed on the hanging ear (19).

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