A reamer and meat grinder

Abstract

The present application relates to the technical field of meat grinder, and discloses a reamer and a meat grinder, the reamer comprises a main reamer and an auxiliary reamer, the main reamer is used for being in transmission connection with a driving motor and rotating in a first direction under the driving of the driving motor, the main reamer comprises a plurality of main blades which are uniformly distributed around the rotation axis of the main reamer, the auxiliary reamer is selectively installed on any one or more of the plurality of main blades, and the auxiliary reamer is arranged to be able to freely rotate around its own axis to be damped in a second direction when being hit by the meat to be ground while the main reamer rotates in the first direction, the auxiliary reamer of the present application can actively supplement the cutting of the meat to be ground in the blind area of the main blade, the rotation direction of the auxiliary reamer is opposite to that of the main reamer, effectively avoiding the problem that part of the food materials cannot be ground due to the fact that the meat to be ground follows the main reamer to idle, and significantly improving the grinding effect and the uniformity of the material particles.

Description

Technical Field

[0001] This invention relates to the field of meat grinder technology, and more specifically to a reamer and a meat grinder. Background Technology

[0002] As a food processing appliance, a meat grinder uses a motor to drive the shovel to rotate at high speed to quickly grind meat and other ingredients. The shovel includes multiple blades evenly distributed along its rotation axis. Each blade cuts the ingredients as it rotates with the main shovel. Due to the existence of dead corners in the shovel, the size of the minced material particles is uneven, and there may even be large pieces of uncut ingredients remaining, resulting in poor shovel cutting effect. Summary of the Invention

[0003] This invention provides a reamer and a meat grinder to solve the problems of the material being ground easily spinning with the reamer and thus failing to be effectively cut, resulting in poor grinding effect and uneven particle size.

[0004] In a first aspect, the present invention provides a reamer, comprising: The main reamer is used to be connected to the drive motor and rotate in a first direction under the drive of the drive motor. The main reamer includes a plurality of main blades evenly distributed around the rotation axis of the main reamer. A secondary reamer may be selectively mounted on one or more of the main blades, and the secondary reamer is configured to rotate freely about its own axis to be damped to rotate in a second direction by impact from the wrought object when the main reamer rotates in a first direction.

[0005] Beneficial effects: The secondary reamer can shred the material in a direction opposite to that of the main reamer, supplementing the shredding blind spots of the main blade and significantly improving the shredding effect and the uniformity of material particles. Furthermore, the reverse rotation of the secondary reamer applies a counterforce to the material, effectively dissipating its rotational kinetic energy along the primary direction and suppressing the tendency for the material to spin idly with the main reamer, thus preventing some food from being effectively shredded. Simultaneously, the free rotation of the secondary reamer requires no additional power source or control system, relying entirely on the mechanical structure, resulting in a simple structure, low cost, and reliable operation.

[0006] In one alternative embodiment, the front edge of the main blade when it rotates in the first direction is formed with a cutting edge, which extends from the inside to the outside in the radial direction of the main blade along a second direction opposite to the first direction.

[0007] Beneficial effects: While cutting the tangled object, the blade applies a resultant force radially outward with a circumferential component in the second direction, causing the tangled object to move radially outward along an arc-shaped trajectory in the second direction. The direction of this arc-shaped trajectory coincides with the expected rotation direction of the secondary reamer upon impact with the tangled object, allowing the tangled object to impact the secondary blade of the secondary reamer at an angle and direction matching the rotation direction of the secondary reamer. This efficiently transfers kinetic energy to the secondary reamer, driving it to rotate smoothly and powerfully in the second direction.

[0008] In one alternative implementation, the sweeping region edge of the secondary reamer is adjacent to the radial outer end of its corresponding mounted primary blade.

[0009] Beneficial effects: The secondary blade of the secondary reamer can intercept and supplement the cutting in the area where the linear velocity of the main blade is the highest and the tangled object is most likely to escape or spin idly due to centrifugal force. Its reverse cutting can capture and cut the tangled object in the cutting blind zone of the main blade, effectively intercepting the tangled object that tries to escape from the main blade or spins idly with the main blade. At the same time, the edge of the sweeping area of ​​the secondary reamer adjacent to the radial outer end of the main blade can also increase the driving torque of the tangled object on the secondary reamer, enhancing the rotational sensitivity and cutting effect of the secondary reamer.

[0010] In one optional embodiment, the rotation radius of the secondary reamer is D, and the distance between the outer end of the main blade on the side away from the mounting axis and the rotation axis of the secondary reamer is L. D is greater than or equal to L, and the difference between D and L is not greater than 3mm.

[0011] Beneficial effects: On the one hand, it ensures that the secondary blade of the secondary reamer can effectively intercept and cut the wrought object outside the radial outer contour of the main blade, achieving effective coverage of the cutting blind zone of the main reamer; on the other hand, it controls the extension amount to a very small range, avoiding excessive extension of the secondary blade of the secondary reamer, which would cause interference with the inner wall of the reamer bowl, increase unnecessary rotational inertia, or reduce the rotational sensitivity of the secondary reamer, thus ensuring the safety and reliability of the reamer's operation.

[0012] In one optional embodiment, the rotation radius of the secondary reamer is D, and the distance between the outer end of the main blade on the side away from the mounting axis and the rotation axis of the secondary reamer is L, where L is greater than D, and the difference between L and D is not greater than 5mm.

[0013] Beneficial effects: The sweeping area edge of the secondary blade of the secondary reamer is recessed within the radial outer end of the main blade but close to its inner side. On the one hand, this allows the secondary blade of the secondary reamer to perform reaming on the workpiece at a position close to the edge inside the radial outer end of the main blade. While ensuring the supplementary cutting effect, the secondary blade of the secondary reamer is "protected" inside the main blade in the radial direction and will not directly face the inner wall of the reamer bowl. This effectively reduces the risk of collision or interference between the secondary blade of the secondary reamer and the inner wall of the reamer bowl, further improving the safety and reliability of the reamer during operation.

[0014] In one optional embodiment, the rotation radius of the secondary reamer is D, and the distance between the rotation axis of the secondary reamer and the mounting axis of the main reamer is D1. D is less than D1 and the difference between the two is not less than 1 mm, and the difference between D and D1 is not greater than 5 mm.

[0015] Beneficial effects: It avoids contact between the secondary blade of the secondary reamer and the outer surface of the mounting shaft of the main reamer, ensuring the free rotation of the secondary reamer; at the same time, it ensures that the sweeping area of ​​the secondary reamer can cover the wrought area from the radial center to the radial outer end of the main blade of the main reamer, avoiding the secondary blade of the secondary reamer being too short to effectively intercept and wrought the object in the vicinity of the mounting shaft, thus ensuring the wrought effect of the secondary reamer.

[0016] In one alternative embodiment, the secondary reamer includes at least three secondary blades, which are evenly distributed about the rotation axis of the secondary reamer.

[0017] Beneficial effects: During the rotation of the secondary reamer, each secondary blade can cut the reamer sequentially and continuously, improving the cutting frequency and reaming efficiency of the secondary reamer; at the same time, the evenly distributed multiple secondary blades are conducive to the dynamic balance of the secondary reamer during high-speed rotation, reducing vibration and noise, and improving the working stability and service life of the secondary reamer.

[0018] In one alternative embodiment, the sweep angle α of the secondary blade of the secondary reamer outside the front profile of the main blade in the direction of rotation is greater than the included angle β between two adjacent secondary blades, so that at least one secondary blade is always located in front of the main blade in the direction of rotation.

[0019] Beneficial effects: On the one hand, it achieves continuous and uninterrupted coverage of the main reamer's reaming blind zone by the secondary reamer, avoiding the problem of the reamer spinning freely due to the "coverage gap" without being intercepted by the secondary reamer; on the other hand, the reamer located outside the front contour of the main blade's rotation direction has a large displacement after being agitated by the main blade, which can continuously drive the secondary reamer to rotate in the second direction, avoiding the secondary reamer from stopping due to insufficient driving force, and ensuring the continuity and reliability of the secondary reamer's operation.

[0020] In one alternative embodiment, the sweep angle α of the secondary blade of the secondary reamer outside the front profile of the primary blade in the direction of rotation is greater than 120°.

[0021] Beneficial effects: This not only enables the secondary reamer to continuously cover the main reamer's cutting blind zone, but also provides a certain degree of "coverage redundancy." This "coverage redundancy" provides the secondary reamer with tolerance for rotational fluctuations, allowing it to maintain continuous coverage of the main reamer's cutting blind zone even when the secondary reamer's instantaneous rotational speed fluctuates significantly due to changes in the impact force of the reamer. This greatly improves the robustness of the secondary reamer's operation and its adaptability to different types and states of reamerized materials.

[0022] In one alternative embodiment, each of the secondary blades of the secondary reamer has a cutting edge on both sides.

[0023] Beneficial effect: When each blade rotates in any direction around the axis of rotation of the secondary reamer, the side facing the wrought object has a sharp cutting edge, which can effectively cut the wrought object.

[0024] In one alternative embodiment, in the axial direction of the main reamer, the axial distance x between the secondary blade of the secondary reamer and the main blade on which it is mounted is not less than 3 mm and not more than 8 mm.

[0025] Beneficial effects: It avoids the blockage or jamming of the shredded particles between the secondary reamer and the main blade when the spacing is too small, ensuring the smooth flow and distribution of the shredded material; it also avoids the weakening of the cutting synergy between the secondary reamer and the main reamer and the formation of "dead zones" when the spacing is too large, ensuring the synergistic shredding effect of the secondary reamer and the main reamer in the axial direction, and achieving the best balance between shredding efficiency and shredding uniformity.

[0026] In one alternative embodiment, the main blades are axially spaced on the mounting shaft of the main reamer. The main blades include a first blade and a second blade. The first blade has a mounting hole, and the secondary reamer is rotatably mounted on the first blade through a connector passing through the mounting hole.

[0027] Beneficial effects: The secondary reamer is rotatably mounted on the first insert via a connector passing through the mounting hole, achieving functional focus of the secondary reamer on a specific insert. The mounting hole and connector have a simple and reliable structure, and the assembly relationship between the secondary reamer and the primary reamer is independent and flexible, facilitating manufacturing, assembly, and maintenance.

[0028] Secondly, the present invention also provides a meat grinder, comprising: a main unit, a grinding bowl, and the main blade described in the first aspect, wherein the main unit has a drive motor, the grinding bowl is disposed below the main unit, the main blade is disposed inside the grinding bowl, and the main blade is drively connected to the drive motor. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is an exploded view of a meat grinder according to an embodiment of the present invention; Figure 2 This is a top view of a reamer according to an embodiment of the present invention; Figure 3 for Figure 1 A schematic diagram of a partial structure of a meat grinder is shown; Figure 4 This is an exploded view of a reamer according to an embodiment of the present invention; Figure 5 This is a front view of a reamer according to an embodiment of the present invention; Figure 6 This is a side view of a reamer according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of a reamer according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures: 100. Meat grinder; 10. Slicer blade; 11. Main reamer; 111. First insert; 1111. Mounting hole; 112. Second insert; 113. Mounting shaft; 12. Secondary reamer; 121. Secondary cutting tool; 122. Connector; 20. Main unit; 30. Screwdriver; 31. Bowl body; 32. Lid. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] As a food processing appliance, a meat grinder uses a motor to drive a high-speed rotating shovel to quickly grind meat and other ingredients. The shovel includes multiple blades evenly distributed along its rotation axis. Each blade cuts the ingredients as it rotates. In related technologies, during the continuous rotation of the shovel in a single direction, the blades inevitably exert a force on the ingredients along the rotation direction while cutting them. This causes the cut ingredients to acquire a moment of inertia along the rotation direction of the main shovel, resulting in the ingredients rotating synchronously with the main shovel in the vicinity. This following rotation prevents the ingredients from being effectively cut by the blades of the main shovel, instead causing them to spin idly in the grinding bowl with the shovel. This results in poor grinding effect, uneven particle size of the ground material, and even the presence of large, uncut pieces of ingredients.

[0034] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, a reamer 10 is provided, comprising: a main reamer 11 and a secondary reamer 12.

[0036] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a reamer 10, which is suitable for equipment such as meat grinders 100, food processors, and food processing machines, and is used for mincing and processing ingredients such as meat and vegetables. The reamer 10 mainly includes two parts: a main reamer 11 and a secondary reamer 12.

[0037] The main reamer 11 is used for transmission connection with the drive motor, and under the drive of the drive motor, it revolves around its own axis in a first direction (such as...). Figure 3 (In the clockwise direction shown). The main reamer 11 includes a plurality of main blades evenly distributed around its axis of rotation to ensure the dynamic balance of the main reamer 11 during high-speed rotation. In this embodiment, the main reamer 11 is exemplary shown to have four main blades, but the invention is not limited thereto, and the number of main blades may be set to three, two or more, depending on actual design needs.

[0038] The secondary reamer 12 can be selectively mounted on any one or more of the main cutting tools. That is, the secondary reamer 12 can be mounted on only one main cutting tool, or simultaneously on two or more main cutting tools. Figure 1 In the illustrated embodiment, the secondary reamer 12 is disposed on one of the main blades of the primary reamer 11. The secondary reamer 12 is configured to rotate freely about its own axis, that is, the secondary reamer 12 is rotatably connected to the main blade, and the rotation of the secondary reamer 12 is not constrained by the limiting structure, and its rotation angle is unrestricted within the range of 360°.

[0039] When the main reamer 11 rotates in the first direction, the main blade drives the secondary reamer 12 to revolve synchronously around the rotation axis of the main reamer 11. During this process, the secondary blade 121 of the secondary reamer 12 is impacted by the object being wrought. Due to the centrifugal force acting on the object, it has a relative rotational direction (e.g., along the second direction) with respect to the main reamer 11. Figure 3 The secondary reamer 12 moves radially outward (in a counter-clockwise direction as shown), and can rotate freely around its own axis. This impact force generates a torque that forces the secondary reamer 12 to rotate around its own axis in a second direction, thereby causing the secondary reamer 12 to rotate with damping in the second direction while the main reamer 11 continues to rotate in the first direction. The rotation of the secondary reamer 12 in the second direction enables its secondary blade 121 to cut the wrought object in a rotational direction opposite to that of the main reamer 11, thereby achieving secondary cutting of the wrought object within the blind zone of the main blade cutting edge, significantly improving the cutting effect.

[0040] In other words, the motion of the main reamer 11 determines the direction of motion of the wrought object relative to the secondary reamer 12, and the relative direction of motion of the wrought object determines the direction of force on the secondary reamer 12, which in turn determines the direction of rotation of the secondary reamer 12. This application converts the rotational motion of the main reamer 11 into the reverse rotational motion of the secondary reamer 12. The entire process requires no additional power source, no sensors or control system, and is achieved entirely through the ingenious design of the mechanical structure.

[0041] The secondary reamer 12 can supplement the cutting blind zone of the main reamer 11 by cutting it on the side of the main blade of the main reamer 11, so that the material being cut can be cut more fully and evenly, and the material particles after cutting are finer and more uniform.

[0042] Meanwhile, since the secondary reamer 12 rotates in the opposite direction to the main reamer 11, this application uses the reverse rotation of the secondary reamer 12 to apply a reverse force to the wrought object. This reverse force reduces the rotational inertia of the wrought object along the first direction, thereby reducing the velocity of the wrought object in the first direction. The rotational kinetic energy of the wrought object in the first direction is effectively dissipated, and the velocity of the wrought object in the first direction is reduced, thus suppressing its tendency to follow the main reamer 11 in idle motion.

[0043] The secondary reamer 12 applies a reverse cutting force and resistance along the second direction to the tangled object. The tangled object has inertia moving along the first direction, while the secondary blade 121 moves along the opposite second direction. The two move towards each other, and the cutting edge of the secondary reamer 12 can cut into the tangled object at the maximum relative speed, resulting in strong cutting force, high cutting efficiency, and good cutting effect.

[0044] In a traditional meat grinder 100, when meat containing tough fibers such as fascia and tendons is being ground, the meat tendons tend to rotate along with the blade 10 when the blade 10 rotates, causing some of the meat to be unable to be effectively cut. The fibers tend to slip off the blade, resulting in poor grinding effect.

[0045] This application utilizes the secondary reamer 12 to "cut towards" the tangled material, so that the blade cuts into the fiber in a direction opposite to the direction of movement of the tangled material, thus suppressing the tendency of the fiber to slip off the blade and significantly improving the cutting effect.

[0046] Furthermore, in this application, since the secondary reamer 12 has unrestricted free rotation around its own axis, the sweeping area of ​​the secondary blade 121 of the secondary reamer 12 extends partially beyond the front contour of the main blade in the direction of rotation during rotation. The extension of the secondary blade 121 beyond this contour means that the secondary blade 121 can contact the wrought object before the cutting edge of the main blade reaches it, thereby pre-cutting the wrought object before the main blade performs cutting, or supplementing the cutting of the wrought object after the cutting edge of the main blade has made a cut.

[0047] Therefore, when the object being tangled rotates along the first direction with the main reamer 11, it will be intercepted and cut by the secondary reamer 12 on the front side of the main blade. The continuous interception and cutting by the secondary blade 121 can effectively cut the tough fibers, avoid the "linking" phenomenon, and prevent the object being tangled from spinning idly with the main reamer 11.

[0048] Furthermore, each main blade has a cutting edge formed on its front edge when rotating in the first direction. The term "front edge" refers to the edge of the main blade facing the workpiece as it rotates with the main reamer 11 in the first direction. In some embodiments, reference is made to... Figures 1-5 The cutting edge extends radially from the inside out along a second direction, which is opposite to the first direction. In other words, the drive motor drives the main reamer 11 to rotate in one direction. When the main reamer 11 rotates clockwise, the cutting edge extends radially from the inside out along a counterclockwise direction. This design of the cutting edge extension direction allows the cutting edge to apply a radially outward component force to the wrought object while cutting, thereby causing the wrought object to tend to move radially outward relative to the main reamer 11 along the second direction.

[0049] The extension direction of the cutting edge of the main blade of the main reamer 11 not only determines the cutting angle of the blade, but also determines the trajectory and force direction of the entangled object at the moment of cutting. When the main reamer 11 rotates in the first direction, the cutting edge extends from the inside to the outside in the second direction in the radial direction of the main blade. This means that at the moment the cutting edge cuts into the entangled object, the cutting force applied to the entangled object is not a purely tangential or radial force, but a resultant force of both. Under the action of this resultant force, the entangled object does not simply move radially outward, but moves along an arc-shaped trajectory that points from near the center of the main reamer 11 to the radially outer end and has a circumferential component in the second direction. That is, the entangled object moves radially outward along an arc-shaped path in the second direction.

[0050] The direction of the arc-shaped trajectory coincides with the expected motion direction of the secondary blade 121 of the secondary reamer 12 under the impact of the tangential object, i.e., the second direction. In other words, the motion direction of the tangential object under the action of the blade of the main reamer 11 is exactly consistent with the direction in which the secondary blade 121 of the secondary reamer 12 is driven to rotate. This directional alignment allows the tangential object, after leaving the blade of the main reamer 11, to impact the secondary blade 121 of the secondary reamer 12 at an angle and direction matching the rotation direction of the secondary reamer 12, thereby efficiently transferring kinetic energy to the secondary reamer 12 and driving it to rotate smoothly and powerfully along the second direction.

[0051] If the cutting edge of the main reamer 11 extends in other directions, the trajectory of the object after leaving the cutting edge will have different directional components. Its circumferential component in the second direction is insufficient. When it impacts the secondary blade 121 of the secondary reamer 12, there is a large angle between the direction of the impact force and the rotation direction of the secondary blade 121. The effective component of the force is reduced, and the driving efficiency of the secondary reamer 12 is reduced.

[0052] The design of the cutting edge of the main reamer 11 extending radially from the inside out along the second direction, through precise guidance of the movement trajectory of the wrought object, enables the wrought object to move along an arc-shaped trajectory that conforms to the rotation direction of the secondary reamer 12. This achieves efficient kinetic energy transfer and kinematic matching between the cutting action of the main reamer 11 and the reverse drive of the secondary reamer 12, avoiding disordered movement and kinetic energy dissipation of the wrought object due to the complex force direction.

[0053] In some embodiments, refer to Figures 2-7 The sweeping area edge of the secondary reamer 12 is adjacent to the radial outer end of its corresponding main blade. As described in the foregoing embodiments of the present invention, the secondary reamer 12 is mounted on the main blade of the main reamer 11 and can rotate freely about its own axis. When the main reamer 11 rotates in a first direction, the secondary reamer 12 revolves together with the main blade about the rotation axis of the main reamer 11, while the secondary reamer 12 rotates itself about its axis in a second direction. During the rotation of the secondary reamer 12, the area traversed by its secondary blade 121 constitutes the sweeping area of ​​the secondary reamer 12.

[0054] The term "sweep area edge" refers to the circumferential boundary of the circular trajectory formed by the outermost point of the secondary blade 121 when the secondary reamer 12 rotates around its own axis. It should be noted that those skilled in the art, upon reading this specification, should understand that the term "adjacent" is intended to cover situations where there may be a slight gap between the sweep area edge of the secondary reamer 12 and the radially outer end of the main blade, and also includes situations where the sweep area edge of the secondary reamer 12 slightly extends beyond or slightly retracts into the radially outer end of the main blade.

[0055] When the main reamer 11 rotates at high speed around its axis of rotation in the first direction under the drive of the drive motor, the radial outer end of the main blade has the maximum linear velocity. However, precisely because the radial outer end of the main blade has the maximum linear velocity, the centrifugal force on the shredded material in this area is also the greatest. During the high-speed rotation of the main reamer 11, the shredded material, especially partially shredded and smaller particles, is easily thrown towards the inner wall of the reamer bowl 30 under the action of centrifugal force, thus escaping the effective cutting range of the main blade. At the same time, the tangential friction force on the shredded material at the radial outer end of the main blade is also the greatest, which makes it easier for the shredded material to be driven by the main blade and rotate along the first direction with the main reamer 11, forming a "free-spinning" phenomenon.

[0056] The sweeping area edge of the secondary reamer 12 is positioned near the radially outer end of the main blade, meaning that the secondary blade 121 of the secondary reamer 12 can intercept and supplement the cutting in the area where the main blade has the highest linear velocity, the strongest cutting action, and where the entangled object is most likely to escape or spin idly. The secondary reamer 12 rotates in this area around its own axis in a second direction, and the rotation direction of its secondary blade 121 is opposite to that of the main reamer 11. Therefore, the cutting direction of the secondary blade 121 on the entangled object is also opposite to the cutting direction of the main blade of the main reamer 11. This reverse cutting can capture and cut the entangled object within the cutting blind zone of the main blade, thereby effectively intercepting and cutting those entangled objects that attempt to escape from the main blade or spin idly with it.

[0057] The sweeping edge of the secondary reamer 12 is adjacent to the radial outer end of the main blade, which can also increase the driving torque of the workpiece on the secondary reamer 12. The proximity of the sweeping edge of the secondary reamer 12 to the radial outer end of the main blade allows the secondary blade 121 of the secondary reamer 12 to approach the inner wall of the auger bowl 30 during rotation, and cooperate with the inner wall of the auger bowl 30 to cut the workpiece.

[0058] The specific value of the distance between the edge of the sweeping area of ​​the secondary blade 121 and the radial outer end of the main blade is not absolutely fixed, but can be adaptively adjusted according to factors such as the size of the main reamer 11 and the volume of the auger 30, as long as the secondary blade 121 of the secondary reamer 12 can cut the object near the radial outer end of the main blade.

[0059] Reference Figure 2 The rotation radius of the secondary reamer 12 is D, which is defined as the distance between the rotation axis of the secondary reamer 12 and the outermost point of the secondary blade 121 of the secondary reamer 12. In other words, D is the radius of the circular sweeping area formed by the secondary blade 121 of the secondary reamer 12 when it rotates around its own axis. The circular trajectory traversed by the outermost point of the secondary blade 121 of the secondary reamer 12 during this rotation is the edge of the sweeping area of ​​the secondary reamer 12.

[0060] At the same time, refer to Figure 4 The main blade has an outer end on the side furthest from the rotation axis of the main reamer 11. This outer end is the radially furthest point or edge of the main blade from the rotation axis of the main reamer 11. The distance between the radially outer end of the main blade and the rotation axis of the secondary reamer 12 is defined as L. The numerical relationship between D and L determines the relative positional relationship between the edge of the sweeping area of ​​the secondary reamer 12 and the radially outer end of the main blade. When D is greater than L, the edge of the sweeping area formed by the outermost point of the secondary blade 121 of the secondary reamer 12 is located outside the radially outer end of the main blade, that is, the secondary blade 121 of the secondary reamer 12 can extend beyond the radially outer end contour of the main blade during rotation; when D equals L, the edge of the sweeping area of ​​the secondary reamer 12 approximately coincides with the radially outer end of the main blade; when D is less than L, the edge of the sweeping area of ​​the secondary reamer 12 is located inside the radially outer end of the main blade.

[0061] In some embodiments, such as Figure 2 As shown, D is greater than or equal to L, and the difference between D and L is no greater than 3 mm. In other words, the secondary blade 121 of the secondary reamer 12 has an extension of 0 to 3 mm at its outermost end relative to the radial outer end of the main blade. The edge of the sweeping area of ​​the secondary reamer 12 does not excessively extend beyond the radial outer end of the main blade, but forms a tight cutting boundary near the radial outer end of the main blade with a small extension, effectively covering the cutting blind zone of the main reamer 11. Thus, it is ensured that the secondary blade 121 of the secondary reamer 12 can effectively intercept and cut the wrought object outside the radial outer end contour of the main blade, while avoiding excessive extension of the secondary blade 121 of the secondary reamer 12, which would cause interference with the inner wall of the reamer bowl 30, increase unnecessary rotational inertia, or reduce the rotational sensitivity of the secondary reamer 12.

[0062] In other embodiments, L is greater than D, meaning the sweeping edge of the secondary blade 121 of the secondary reamer 12 is located inside the radial outer end of the main blade, and the difference between L and D is no greater than 5 mm. In other words, although the sweeping edge of the secondary blade 121 of the secondary reamer 12 is recessed within the radial outer end of the main blade, the amount of recess is strictly controlled within a small range to ensure cutting effect. The sweeping edge of the secondary blade 121 of the secondary reamer 12 is adjacent to the inner side of the radial outer end of the main blade. The secondary blade 121 of the secondary reamer 12 performs reaming on the workpiece at a position close to the edge inside the radial outer end of the main blade. The secondary blade 121 of the secondary reamer 12 is "protected" inside the main blade in the radial direction and does not directly face the inner wall of the reamer 30. This configuration effectively reduces the risk of collision or interference between the secondary blade 121 of the secondary reamer 12 and the inner wall of the reamer 30, improving the safety and reliability of the reamer 10 during operation.

[0063] In the aforementioned embodiments, the sweeping area edge of the secondary reamer 12 is located outside or coincides with the radial outer end of the main blade, while in this embodiment, the sweeping area edge of the secondary reamer 12 is slightly recessed within the radial outer end of the main blade. Both of these dimensional relationships are different implementations of the overall concept that "the sweeping area edge of the secondary reamer 12 is adjacent to the radial outer end of its correspondingly mounted main blade." Together, they constitute a complete and complementary set of preferred embodiments, enabling the technical solution of the present invention to adapt to a wider range of application scenarios and design requirements.

[0064] Furthermore, refer to Figures 1-7 The main reamer 11 has a mounting shaft 113, and the main cutting tool of the main reamer 11 is mounted on the mounting shaft 113. (Refer to...) Figure 2 The distance between the rotation axis of the secondary reamer 12 and the mounting shaft 113 of the primary reamer 11 is defined as D1. It should be understood that D1 is numerically equal to the radial distance from the rotation center of the secondary reamer 12 to the outer surface of the mounting shaft 113 of the primary reamer 11, that is, the difference between the radius of the circumference of the radial direction of the rotation center of the secondary reamer 12 on the primary reamer 11 and the radius of the mounting shaft 113.

[0065] In some embodiments, such as Figure 2 As shown, D is less than D1, and the difference between D1 and D is not less than 1mm. In other words, at least 1mm of clearance is maintained between the outermost end of the secondary blade 121 of the secondary reamer 12 and the outer contour of the mounting shaft 113, and the secondary blade 121 of the secondary reamer 12 will not come into contact with the outer surface of the mounting shaft 113 of the main reamer 11.

[0066] Furthermore, the difference between D1 and D is no greater than 5mm to ensure that the sweeping area of ​​the secondary reamer 12 can cover the wrought area from the radial center to the radial outer end of the main blade of the main reamer 11. When the difference between D1 and D is greater than 5mm, the distance between the outermost end of the secondary blade 121 of the secondary reamer 12 and the outer contour of the mounting shaft 113 is too large, the length of the secondary blade 121 of the secondary reamer 12 is too short, and the sweeping area of ​​the secondary reamer 12 is far away from the mounting shaft 113. In this case, the secondary reamer 12 cannot effectively intercept and wrought the object in the vicinity of the mounting shaft 113, thus reducing the wrought effect of the secondary reamer 12.

[0067] Reference Figures 1-5The secondary reamer 12 includes a plurality of secondary blades 121, each extending radially outward from the rotation center of the secondary reamer 12 for cutting the reamer. In some embodiments, the secondary reamer 12 includes at least three secondary blades 121, which are evenly distributed around the rotation axis of the secondary reamer 12. "At least three secondary blades 121" means that the secondary reamer 12 as a whole includes three or more secondary blades 121. "The plurality of secondary blades 121 are evenly distributed around the rotation axis of the secondary reamer 12" means that the secondary blades 121 are arranged at equal angular intervals in the circumferential direction around the rotation axis of the secondary reamer 12, that is, the included angle between any two adjacent secondary blades 121 is equal. When there are three secondary blades 121, the included angle between two adjacent secondary blades 121 is 120°; when there are four secondary blades 121, the included angle between two adjacent secondary blades 121 is 90°; when there are n secondary blades 121, the included angle between two adjacent secondary blades 121 is 360° / n.

[0068] In some embodiments, refer to Figure 2 The sweep angle α of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the rotation direction is greater than the included angle β between two adjacent secondary blades 121, so that there is always at least one secondary blade 121 of the secondary reamer 12 located in front of the main blade in the rotation direction.

[0069] The term "front profile of the main blade in the direction of rotation" refers to the outer profile formed by the front edge of the main blade in the direction of rotation, i.e., the side where the blade edge is located, when the main blade rotates along the first direction with the main reamer 11. This profile is the boundary line of the side of the main blade facing the wrought object during operation. Beyond the front profile of the main blade in the direction of rotation is an area that the main blade of the main reamer 11 cannot effectively cover when working alone, i.e., the wrought blind zone. Within this area, the wrought object easily escapes the cutting range of the main blade and spins freely along the first direction with the main reamer 11.

[0070] The term "sweeping angle α of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the direction of rotation" refers to the central angle corresponding to the portion of the rotation trajectory of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the direction of rotation during one revolution around its own axis. In other words, α is the range of rotation angles within which the secondary blade 121 of the secondary reamer 12 extends beyond the radial outer end profile of the main blade during rotation, enabling it to cut the workpiece within the reaming blind zone of the main reamer 11.

[0071] The "angle β between two adjacent secondary blades 121" refers to the circumferential angle between any two adjacent secondary blades 121 among a plurality of secondary blades 121 uniformly distributed around the rotation axis of the secondary reamer 12. When the secondary reamer 12 includes n uniformly distributed secondary blades 121, β = 360° / n. For example, when the secondary reamer 12 includes three secondary blades 121, β = 120°; when the secondary reamer 12 includes four secondary blades 121, β = 90°.

[0072] In some embodiments, the sweep angle α of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the direction of rotation is greater than the included angle β between two adjacent secondary blades 121. This geometric relationship ensures that during the free rotation of the secondary reamer 12 around its own axis, there is always at least one secondary blade 121 of the secondary reamer 12 located outside the front profile of the main blade in the direction of rotation, thereby achieving continuous and uninterrupted coverage of the reamer 12 over the reaming blind zone of the main reamer 11.

[0073] When the sweep angle α of the secondary blade 121 of the secondary reamer 12 outside the front contour of the main blade in the direction of rotation is less than the included angle β between two adjacent secondary blades 121, the secondary reamer 12 will experience a "coverage gap period" during rotation. During this period, all secondary blades 121 are located within the front contour of the main blade in the direction of rotation, and no secondary blade 121 can extend beyond the radial outer contour of the main blade to cut the object being cut. The existence of this "coverage gap period" means that the coverage of the reamer 12 over the reaming blind zone of the main reamer 11 by the secondary reamer 12 is intermittent and discontinuous. During the "coverage gap period", the object being cut is completely unblocked by the secondary reamer 12 and can freely follow the main reamer 11 to rotate idly, greatly reducing the value of the secondary reamer 12.

[0074] The rotation of the secondary reamer 12 is a passive rotation driven by the impact of the food being shredded. Food outside the front contour of the main blade in the direction of rotation is agitated by the main blade, resulting in a larger displacement and making it easier to drive the secondary blade 121 to rotate. There is always at least one secondary blade 121 of the secondary reamer 12 located outside the front contour of the main blade in the direction of rotation, which ensures that the secondary reamer 12 is always driven to rotate in the second direction by this part of the food, and prevents the secondary reamer 12 from stopping due to insufficient driving force.

[0075] The sweeping angle α of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the direction of rotation directly determines the "dwelling time" and "coverage range" of the secondary blade 121 outside the radial outer end profile of the main blade. The larger α is, the longer the secondary blade 121 of the secondary reamer 12 stays outside the profile, and the more opportunities there are for reaming the workpiece in the reaming blind zone.

[0076] In some embodiments, refer to Figure 2The sweeping angle α of the secondary blade 121 of the secondary reamer 12 outside the front profile of the main blade in the rotation direction is greater than 120°. Therefore, in each working cycle of the secondary blade 121, there is an effective working state with an angle range of more than 120° that can perform reaming on the reaming blind zone, which increases the reaming opportunity of the reaming blind zone, and the area of ​​the reaming blind zone covered by the secondary reamer 12 is larger.

[0077] Under the condition that α>120°, the secondary blade 121 of the secondary reamer 12 can not only achieve continuous coverage of the reaming blind zone of the main reamer 11, but also has a certain "coverage redundancy". The so-called "coverage redundancy" refers to the difference between α and the included angle β between two adjacent secondary blades 121.

[0078] Specifically, when the instantaneous rotational speed of the secondary reamer 12 decreases due to a temporary reduction in the impact force of the wrought object, the sweeping speed of the secondary blade 121 outside the contour slows down, and the time when the first secondary blade 121 leaves the position outside the contour is delayed. Simultaneously, the time when the second secondary blade 121 reaches the position outside the contour is also correspondingly delayed. Since α > 120°, the second secondary blade 121 has already reached the position outside the contour before the first secondary blade 121 leaves it, resulting in a certain temporal overlap. This overlap provides the secondary reamer 12 with tolerance for rotational fluctuations, enabling it to maintain continuous coverage of the wrought blind zone of the main reamer 11 even when the instantaneous rotational speed fluctuates significantly.

[0079] In some embodiments, refer to Figures 1-5 Each of the secondary blades 121 of the secondary reamer 12 has a cutting edge on both sides, so that the distal edge of the secondary blade 121 can effectively cut the wrought object no matter which direction it rotates around the rotation axis of the secondary reamer 12.

[0080] As described in the foregoing embodiments of the present invention, the secondary reamer 12 is configured to rotate freely about its own axis, and its rotation direction and speed are passive movements driven by the impact of the wrought object. The rotation direction of the secondary reamer 12 depends on the direction and angle of the impact of the wrought object on the secondary blade 121, and the motion state of the wrought object is affected by various factors such as the rotation direction of the main reamer 11, the type and shape of the wrought object, and the distribution state of the wrought object within the reamer bowl 30.

[0081] The present invention provides cutting edges on both sides of each of the secondary blades 121 of the secondary reamer 12, so that when each secondary blade 121 rotates in any direction around the rotation axis of the secondary reamer 12, the side facing the object being wrought has a sharp cutting edge, and can effectively cut the object being wrought.

[0082] In some embodiments, refer to Figure 7In the axial direction of the main reamer 11, that is, in the direction parallel to the mounting shaft 113 of the main reamer 11, the axial distance between the secondary blade 121 of the secondary reamer 12 and the main blade on which it is mounted is not less than 3 mm and not more than 8 mm. Specifically, this distance refers to the minimum axial distance between the surface of the secondary blade 121 and the surface of the main blade. When the secondary reamer 12 is positioned above the main blade, this distance is the axial distance between the lower surface of the secondary blade 121 and the upper surface of the main blade; when the secondary reamer 12 is positioned below the main blade, this distance is the axial distance between the upper surface of the secondary blade 121 and the lower surface of the main blade.

[0083] During the operation of the main reamer 11 rotating in the first direction, the object being wrought moves within the reamer bowl 30 under the drive of the main reamer 11 and is cut at the cutting edge of the main blade. The axial distance between the secondary blade 121 of the secondary reamer 12 and the main blade constitutes the flow channel and passage space for the object being wrought in the axial direction.

[0084] When the axial distance between the secondary blade 121 of the secondary reamer 12 and the main blade is too small, for shredded materials containing large particles or long fibers, the narrow axial distance may cause the particles of the shredded material to become blocked or stuck between the secondary reamer 12 and the main blade, affecting the normal flow and distribution of the shredded material, thereby reducing the shredding efficiency and shredding uniformity.

[0085] When the axial distance between the secondary blade 121 and the main blade of the secondary reamer 12 is too large, the distance between the secondary blade 121 and the main blade in the axial direction increases, and the cutting edge of the secondary blade 121 deviates further from the cutting edge of the main blade in the axial direction. In this case, the cutting synergy between the secondary blade 121 of the secondary reamer 12 and the main blade of the main reamer 11 is weakened. At the same time, the excessive axial distance will also increase the accumulation and retention area of ​​the wrought material between the secondary reamer 12 and the main blade, which may cause some of the wrought material to form a "dead zone" in the axial distance space, making it impossible to be effectively wrought.

[0086] In summary, this invention provides optimal axial space conditions for the free rotation of the secondary reamer 12, the smooth flow of the reamer material, and the axial coordinated cutting of the secondary reamer 12 and the main reamer 11 by setting the axial distance between the secondary blade 121 of the secondary reamer 12 and the main blade on which it is mounted to be not less than 3 mm and not more than 8 mm. This axial distance range can be adaptively adjusted by those skilled in the art according to actual design needs after reading this specification, but the core design principle and the desired technical effect are universal and unchanged. Those skilled in the art can make various modifications and improvements to the above embodiments without departing from the concept of this invention after reading this specification, and all such modifications and improvements should fall within the protection scope of this invention.

[0087] In some embodiments, refer to Figures 1-7The secondary reamer 12 is positioned above the main blade. During the actual operation of the meat grinder 100, the distribution and movement of the material being ground within the grinding bowl 30 are not completely uniform in the axial direction. Under the influence of gravity, the material tends to settle towards the bottom of the grinding bowl 30. Multiple main blades of the primary reamer 11 are typically arranged axially within the grinding bowl 30, each at a different axial height. Driven by the primary reamer 11, the material is gradually shredded by the cutting action of the main blade. The shredded material particles form an axial distribution gradient from bottom to top within the grinding bowl 30. Finer particles tend to move towards the upper part of the grinding bowl 30, while coarser particles tend to be continuously shredded in the lower part of the grinding bowl 30.

[0088] If the secondary reamer 12 is positioned below the main blade, the density of the material to be shredded in the space below the main blade is high and the particles are large. The secondary blade 121 of the secondary reamer 12 experiences significant resistance when rotating amidst this dense mass of large particles, resulting in low rotational sensitivity and shredding efficiency. Positioning the secondary reamer 12 above the main blade allows its secondary blade 121 to shred the material within the space above the main blade. This arrangement fully utilizes the axial distribution characteristics of the material to be shredded. The space below the main blade primarily handles the main cutting of coarse particles, while the space above the main blade is used by the secondary reamer 12 for supplementary and fine cutting of the initially shredded material particles. After initial cutting at the main blade, some material particles move upwards to the space above the main blade under the mutual pushing action of centrifugal force and the material itself. In this space, they are intercepted and further shredded by the secondary blade 121 of the secondary reamer 12, thus achieving axial flow and graded shredding of the material from coarse to fine cutting.

[0089] In some embodiments, refer to Figures 6-7 The main blades are arranged axially at intervals on the mounting shaft 113 of the main reamer 11. Multiple main blades are arranged axially at intervals on the main reamer 11, so that the main reamer 11 can simultaneously cut the wrought object at multiple axial height levels during operation. When the main reamer 11 rotates in the first direction under the drive of the drive motor, the first blade 111 and the second blade 112 respectively perform rotational cutting on the wrought object in their respective axial height planes.

[0090] The main blade includes a first blade 111 and a second blade 112. The first blade 111 has a mounting hole 1111. The secondary reamer 12 is rotatably mounted on the first blade 111 via a connector 122 passing through the mounting hole 1111. In this embodiment, the secondary reamer 12 is not mounted on all main blades, but selectively mounted on the first blade 111. The mounting hole 1111 is located on the first blade 111, and its position selection needs to comprehensively consider the rotation center position of the secondary reamer 12, the rotation radius of the secondary reamer 12, and the relative positional relationship between the sweeping area of ​​the secondary reamer 12 and the radial outer end of the main blade. The connector 122 includes a rivet or a screw, which passes through the mounting hole 1111 on the first blade 111 and serves as the rotation axis of the secondary reamer 12.

[0091] During assembly, the connector 122 passes through the mounting hole 1111 from one side of the first blade 111, the smooth rod section is located in the mounting hole 1111 and extends out from the other side of the first blade 111, the secondary reamer 12 is sleeved on the smooth rod section, and the head of the connector 122 fixes the connector 122 to the first blade 111 in the axial direction, or it is fastened to the first blade 111 by a nut and a screw. After the secondary reamer 12 is sleeved on the smooth rod section of the connector 122, there is a small radial gap between the secondary reamer 12 and the smooth rod section of the connector 122, allowing the secondary reamer 12 to rotate freely about the axis of the connector 122.

[0092] This application achieves functional focusing of the secondary reamer 12 on a specific cutting tool. The mounting hole 1111 and the connector 122 have a simple and reliable structure, and the assembly relationship between the secondary reamer 12 and the main reamer 11 is independent and flexible, which facilitates manufacturing, assembly and maintenance.

[0093] As described in the foregoing embodiments of the present invention, referring to Figure 6 and Figure 7 The main reamer 11 includes multiple main blades spaced apart along its axial direction, arranged vertically along the mounting shaft 113 of the main reamer 11. Of all the main blades included in the main reamer 11, the first blade 111 is closest to the bottom wall of the reamer cup 30 in the axial direction; that is, the first blade 111 has the lowest axial height among all the main blades. The secondary reamer 12 is mounted on the first blade 111. When the first blade 111 is positioned at the bottom of all the main blades, the secondary reamer 12 is also positioned at the bottom of all the main blades, intercepting and supplementing the reaming of the object at the lowest axial height of the main reamer 11.

[0094] During the actual operation of the meat grinder 100, the material to be ground is fed into the grinding bowl 30 through the upper opening and sinks downwards under the action of gravity, first reaching the bottom area of ​​the grinding bowl 30. The axial distribution of the material to be ground within the grinding bowl 30 is not uniform. The bottom area of ​​the grinding bowl 30 has the highest density, the largest particles, and the most dense accumulation of the material, while the upper area of ​​the grinding bowl 30 has a lower density, smaller particles, and a more dispersed distribution of the material.

[0095] If the secondary reamer 12 is mounted on another main blade, the density of the wrought material at the height of that main blade is lower and the particles are smaller. The impact force of the wrought material on the secondary blade 121 of the secondary reamer 12 is weaker, and the self-rotation driving force of the secondary reamer 12 is insufficient. Therefore, mounting the secondary reamer 12 on the lowest first blade 111 enables the secondary reamer 12 to work under the most favorable conditions. The high density and high impact force of the wrought material provide the secondary reamer 12 with the most sufficient self-rotation driving force.

[0096] In other embodiments, the distance between the secondary reamer 12 and the first blade 111 is adjustable, allowing the same meat grinder 100 to adapt to the slicing requirements of different types of materials. Users can flexibly adjust the axial distance between the secondary blade 121 and the first blade 111 of the secondary reamer 12 according to the type and physical characteristics of the material being shredded, so that the reamer 10 can achieve the best slicing effect in different material processing scenarios.

[0097] According to an embodiment of the present invention, in another aspect, a meat grinder 100 is also provided, such as... Figure 1 As shown, the meat grinder 100 includes: a main unit 20, a grinding bowl 30, and the aforementioned shovel 10. The main unit 20 has a drive motor, the grinding bowl 30 is disposed below the main unit 20, and the shovel 10 is disposed within the grinding bowl 30, with the main shovel 11 being drivenly connected to the drive motor. The main unit 20 has a drive motor and control elements such as switches for controlling the start and stop of the drive motor. The grinding bowl 30 is disposed below the main unit 20 and serves as a container for holding the food to be ground. The shovel 10 is disposed within the grinding bowl 30, located at the center of the grinding bowl 30, and the main shovel 11 of the shovel 10 is drivenly connected to the drive motor of the main unit 20. The rotational power output by the drive motor is transmitted to the main shovel 11, driving the main shovel 11 to rotate around its own axis in a first direction.

[0098] The winch includes a bowl body 31 and a lid 32. The bowl body 31 is a container structure with one open end, forming an internal cavity for accommodating the material to be wont. The main winch 11 is disposed within the cavity of the bowl body 31, and the mounting shaft 113 of the main winch 11 passes through an opening in the lid 32 and is connected to a drive motor. The lid 32 is detachably fitted onto the open end of the bowl body 31 to seal the cavity and prevent the material from splashing during the winch process. When the lid 32 is fitted onto the bowl body 31, the lid 32 and the bowl body 31 together form a relatively enclosed winch space, ensuring the safety of the winch process and preventing the material from scattering to the outside under the action of the high-speed rotating winch 10.

[0099] Furthermore, the inner wall of the bowl 31 may optionally be provided with baffles, which extend along the axial direction of the bowl 31 and protrude from the inner wall surface of the bowl 31. During the high-speed rotation of the reamer 10 to cut the material, the baffles can block and turbulent the material that rotates with the reamer 10, disrupting the material's rotational state and causing it to re-participate in the cutting process. This works in conjunction with the supplementary cutting action of the secondary reamer 12 to further improve the cutting effect and the uniformity of the material particles.

[0100] Those skilled in the art should understand after reading this specification that the meat grinder 100 provided by this invention can be a small household meat grinder 100 or a large-capacity commercial meat grinder 100; it can be a stand-alone countertop meat grinder 100 or a meat grinding component used as an accessory for kitchen appliances such as food processors and stand mixers. The specific form and application scenario of the meat grinder 100 do not constitute a limitation on this invention.

[0101] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined in this application.

Claims

1. A reamer, characterized in that, include: The main reamer (11) is used to be connected to the drive motor and rotate in a first direction under the drive of the drive motor. The main reamer (11) includes a plurality of main blades evenly distributed around the rotation axis of the main reamer (11). A secondary reamer (12) may be selectively mounted on any one or more of the primary blades, and the secondary reamer (12) is configured to rotate freely about its own axis so as to be damped to rotate in a second direction by impact with the wrought object when the primary reamer (11) rotates in a first direction.

2. The reamer according to claim 1, characterized in that, The front edge of the main blade is formed with a cutting edge when it rotates in the first direction, and the cutting edge extends from the inside to the outside in a second direction opposite to the first direction in the radial direction of the main blade.

3. The reamer according to claim 1, characterized in that, The sweeping area edge of the secondary reamer (12) is adjacent to the radial outer end of the corresponding main blade.

4. The reamer according to claim 3, characterized in that, The rotation radius of the secondary reamer (12) is D, and the distance between the outer end of the main blade on the side away from the mounting shaft (113) and the rotation axis of the secondary reamer (12) is L. D is greater than or equal to L, and the difference between D and L is not greater than 3mm.

5. The reamer according to claim 3, characterized in that, The rotation radius of the secondary reamer (12) is D, and the distance between the outer end of the main blade on the side away from the mounting shaft (113) and the rotation axis of the secondary reamer (12) is L. L is greater than D, and the difference between L and D is not greater than 5mm.

6. The reamer according to claim 1, characterized in that, The rotation radius of the secondary reamer (12) is D, and the distance between the rotation axis of the secondary reamer (12) and the mounting shaft (113) of the main reamer (11) is D1. D is less than D1 and the difference between the two is not less than 1mm, and the difference between D and D1 is not greater than 5mm.

7. The reamer according to claim 1, characterized in that, The secondary reamer (12) includes at least three secondary blades (121), and the multiple secondary blades (121) are evenly distributed around the rotation axis of the secondary reamer (12).

8. The reamer according to claim 7, characterized in that, The sweep angle α of the secondary blade (121) of the secondary reamer (12) outside the front profile of the main blade in the direction of rotation is greater than the included angle β between two adjacent secondary blades (121), so that at least one of the secondary blades (121) is always located in front of the main blade in the direction of rotation.

9. The reamer according to claim 8, characterized in that, The secondary blade (121) of the secondary reamer (12) has a sweep angle α greater than 120° outside the front profile of the main blade in the rotation direction.

10. The reamer according to claim 7, characterized in that, The secondary blades (121) of the secondary reamer (12) are provided with cutting edges on both sides.

11. The reamer according to claim 1, characterized in that, In the axial direction of the main reamer (11), the axial distance x between the secondary blade (121) of the secondary reamer (12) and the main blade on which it is mounted is not less than 3 mm and not more than 8 mm.

12. The reamer according to claim 1, characterized in that, The main blades are arranged axially at intervals on the mounting shaft (113) of the main reamer (11). The main blades include a first blade (111) and a second blade (112). The first blade (111) is provided with a mounting hole (1111). The secondary reamer (12) is rotatably mounted on the first blade (111) through a connector (122) passing through the mounting hole (1111).

13. A meat grinder, characterized in that, include: The host (20) has a drive motor; A winch bowl (30) is disposed below the main unit (20); The reamer (10) as described in any one of claims 1 to 12 is disposed within the auger bowl (30), and the main reamer (11) is connected to the drive motor in a driving connection.

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