A knife shaft connecting structure for preventing carbon powder from falling and a shredder

Abstract

The utility model discloses a kind of knife shaft connecting structure and shredding machine of anti carbon powder drop, it is related to mixing tool structure technical field, applied to rotatable tool;Tool includes vertically extending shaft, the upper end of shaft is connected with the output shaft of motor;Tool further includes the blade leaf that extends from the rotation axis side to circumference direction;Knife shaft connecting structure includes shaft and output shaft;Motor has shell outside, shell has lower opening on, lower opening is exposed for output shaft to pass downwards;The upper end of shaft has concave connecting groove;The cross-sectional shape of connecting groove and the lower end of output shaft is same, and it is all non-circular;Output shaft and connecting groove plug-in cooperation, both transmission connection;After connection, the radial dimension of connecting groove is greater than the radial dimension of output shaft, with gap between both, form collection groove;The radial dimension of connecting groove at opening edge is greater than or equal to the radial dimension of lower opening.Finally carbon powder in motor can be avoided drop into lower food material along knife shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of stirring blade structure, specifically to a blade shaft connection structure and a cutting machine that prevents toner from falling off. Background Technology

[0002] Small kitchen appliances such as meat grinders and garlic choppers are popular due to their efficiency and convenience. Their basic structure typically includes a bowl, rotating blades inside the bowl, and a drive motor located above the bowl. Currently, to achieve low costs, these devices generally use traditional brushed motors as their power source. The motor's output shaft has a slot at its end, and power is transmitted to the blade's connecting shaft via a plug-in connection.

[0003] However, this structure harbors a long-overlooked hygiene and safety hazard: the brushed motor is prone to vibration during start-up, shutdown, and load changes, causing the internal carbon brushes to gradually wear down due to continuous friction, producing fine carbon dust. This carbon dust may escape along the assembly gap between the output shaft and the motor housing, eventually falling into the bowl below and contaminating food ingredients. With increased usage frequency, the amount of carbon dust accumulates inside the motor, leading to a greater likelihood and amount of leakage with each use, posing a potential risk to user health.

[0004] Therefore, there is an urgent need for a cutter shaft connection structure and a shredder that prevents toner from falling off, in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the problems in related technologies, this utility model proposes a cutter shaft connection structure and a shredder that prevents toner from falling off, thus avoiding the toner generated in the motor from falling into the food below along the connection between the cutter shaft and the motor.

[0006] This utility model is implemented as follows:

[0007] A cutter shaft connection structure for preventing toner drop is applied to a rotatable cutter; the cutter includes a vertically extending shaft, the upper end of which is connected to the output shaft of a motor; the cutter also includes a blade extending circumferentially from the side of the shaft; the cutter shaft connection structure includes the shaft and the output shaft;

[0008] The motor has a housing with a lower opening for the output shaft to pass through and be exposed downwards; the upper end of the shaft has a recessed connecting groove; the connecting groove and the lower end of the output shaft have the same cross-sectional shape and are both non-circular; the shapes are the same, but the sizes are not exactly the same.

[0009] The output shaft and the connecting groove are plugged into each other and connected by transmission. After connection, the radial dimension of the connecting groove is greater than the radial dimension of the output shaft, and there is a gap between them to form a collection groove. The radial dimension of the connecting groove at the edge of the opening is greater than or equal to the radial dimension of the lower opening.

[0010] When too much toner accumulates inside the motor, it will fall through the gap between the output shaft and the lower opening, eventually ending up in the collection tank instead of the container used for stirring and cutting food, thus preventing the toner from coming into contact with and mixing with the food.

[0011] Furthermore, the radial dimension of the connecting groove at the opening is greater than the radial dimension of the bottom of the connecting groove;

[0012] The end of the output shaft and the bottom side of the connecting groove are either tightly fitted or have a gap.

[0013] The opening of the connecting groove forms a guide flare at the opening, making it easier to insert the output shaft and also facilitating the collection of toner. A tight fit at the bottom is of course the most secure transmission connection, but even if there is a gap, as long as the gap is not too large to cause no contact during rotation, it will not have a significant impact, meaning that the precision requirements for the connection are not high.

[0014] Furthermore, the output shaft has a circumferentially evenly distributed concave-convex structure on its side surface, making the cross-section of the output shaft flower-shaped or star-shaped; the inner side surface of the connecting groove is formed as a concave-convex structure that is misaligned with the output shaft.

[0015] Furthermore, a continuous guide slope is provided along the opening edge of the connecting groove; or multiple discontinuous guide slopes are provided, and the guide slopes correspond to the protrusions or recesses located on the side of the connecting groove.

[0016] The guide ramp faces diagonally upwards.

[0017] Furthermore, the radial dimension of the upper end of the rotating shaft is greater than the radial dimension of the lower opening.

[0018] Furthermore, the cutter shaft connection structure also includes a fixing member; the fixing member is located at the bottom of the rotating shaft; the fixing member and the rotating shaft are detachably connected, and the two are not restricted in the circumferential direction, allowing them to rotate relative to each other;

[0019] The fixing member has an upward-facing slot, into which the lower end of the cutter shaft is inserted; or the lower end of the cutter shaft has a downward-facing slot, into which the fixing member is inserted.

[0020] Furthermore, the rotating shaft includes a cylindrical shaft body with an open upper end, and a vertically elastically telescopic connecting shaft.

[0021] The upper end of the connecting shaft is provided with the connecting groove; the shaft body is sleeved on the outer periphery of the connecting shaft, and the connecting groove is exposed at the upper end of the shaft body; a spring is provided inside the shaft body and on the outer periphery of the connecting shaft, so that the connecting shaft is vertically elastically telescopic; the connecting shaft and the shaft body are circumferentially limited so that the two rotate as a single unit.

[0022] The cutting tool is located inside the container, and the rotating shaft and the output shaft are both centered relative to the container.

[0023] When cutting too much food or distributing it unevenly (such as compacted meat slices), the blade shaft may become misaligned with the output shaft, but they can still make contact. By setting up an elastic telescopic structure, when the motor starts rotating, the connecting shaft will vibrate relative to the output shaft under the power of the output shaft, including contraction, springback, and micro-angle rotation. During this process, the output shaft and the connecting groove will gradually and automatically align until the transmission connection is achieved, thus realizing a stable self-adaptive connection without the need for manual positioning.

[0024] Furthermore, the main body of the connecting shaft is columnar; the connecting shaft is divided into an upper part and a lower part; the radial dimension of the upper part is greater than the radial dimension of the lower part; the spring is sleeved on the outer periphery of the lower part, and the upper part limits the upper end of the spring;

[0025] The upper side surface is provided with at least one vertically extending limiting rib;

[0026] The shaft has an inner circumferential side surface; a vertically extending limiting groove is provided on the inner circumferential side surface; the upper end of the limiting groove does not extend to the upper opening; the cross-section of the limiting groove and the cross-section of the limiting rib are adapted to fit each other, so that the connecting shaft is circumferentially limited relative to the shaft.

[0027] The limiting ribs and limiting grooves also form a limiting mechanism to prevent the connecting shaft and shaft body from completely separating.

[0028] Furthermore, the lower end of the shaft is open, and the limiting groove extends to the lower end opening; the rotating shaft also includes a plug, which cooperates with the lower end opening to close the lower end opening and serves as a bottom end movement limit for the connecting shaft.

[0029] This utility model also provides a shredder, which uses a cutter shaft connection structure to prevent toner from falling as described above; the shredder includes, from bottom to top, an upward-opening container, a top cover adapted to the opening of the container, and a main unit equipped with the motor and the housing;

[0030] The blade is vertically positioned in the center of the container and is detachably connected; the container is used to hold food ingredients and serves as a cavity for chopping the food ingredients; the top cover has an opening in the center for exposing the connecting groove.

[0031] The container, the top cover, and the main unit are detachably connected. After connection, the rotating shaft and the output shaft are in contact.

[0032] Furthermore, the upper surface of the cover is provided with a recessed positioning groove, with an opening in the center of the positioning groove; the positioning groove is provided with multiple positioning ribs evenly distributed circumferentially and oriented radially; the downward-facing surface of the main unit is provided with an adapter groove that mates with the positioning ribs; one of the adapter grooves is provided with a protective switch that can be elastically extended and retracted vertically; after the cover and the main unit are accurately assembled, one of the positioning ribs presses against the protective switch; only when the protective switch is pressed is the internal circuit of the main unit connected. Through the precise cooperation between the positioning ribs and the adapter groove with the protective switch, an anti-misoperation interlock between the cover and the main unit is achieved, ensuring that the circuit can only be connected after accurate installation, effectively improving the operational safety of the equipment.

[0033] The beneficial effects are as follows:

[0034] This utility model provides a cutter shaft connection structure and a shredder to prevent toner from falling. By setting an upward-facing connecting groove on the cutter shaft, the motor output shaft is embedded downward into the connecting groove. When too much toner accumulates in the motor, it will fall down along the gap between the output shaft and the lower opening, eventually falling into the collection tank instead of falling into the container used for stirring and cutting food, thus avoiding contact and mixing between the toner and the food. Attached Figure Description

[0035] Figure 1 An exploded view of a shredder provided for an embodiment of this utility model;

[0036] Figure 2 for Figure 1 A sectional view;

[0037] Figure 3 A cross-sectional view of the cutting tool provided in an embodiment of this utility model;

[0038] Figure 4 This is a cross-sectional view of the cutting tool after explosive separation, provided in an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of the structure of the connecting shaft provided in an embodiment of the present utility model;

[0040] Figure 6 A schematic diagram illustrating the fit between the connecting groove and the output shaft provided in an embodiment of this utility model;

[0041] Figure 7 A cross-sectional view of the connecting groove and the output shaft after they are fitted together, according to an embodiment of this utility model.

[0042] Figure 8 A cross-sectional view of the shredder provided in an embodiment of this utility model;

[0043] Figure label:

[0044] 1. Container; 11. Fastener;

[0045] 2. Top cover; 21. Positioning groove; 22. Positioning rib;

[0046] 3. Main unit; 31. Motor; 311. Output shaft; 32. Housing; 33. Bottom opening; 34. Adapter slot; 35. Protection switch;

[0047] 4. Cutting tool; 41. Rotary shaft; 411. Shaft body; 4111. Limiting groove; 412. Connecting shaft; 4121. Upper part; 4122. Lower part; 4123. Limiting rib; 4124. Connecting groove; 4125. Guide slope; 413. Spring; 414. Plug; 4141. Slot; 42. Blade;

[0048] 5. Collection tank. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] like Figures 1 to 8 As shown, this embodiment provides a meat grinder. The meat grinder includes, from bottom to top, an upward-opening container 1, a top cover 2 adapted to the opening of the container 1, and a main unit 3 equipped with a motor 31 and a housing 32; wherein the motor 31 is a brushed motor 31 with carbon brushes inside.

[0051] The container 1 is equipped with a rotatable cutter 4, which includes a vertically extending shaft 41 and a blade 42 extending circumferentially from the side of the shaft 41. The cutter 4 is vertically located in the center of the container 1 and is detachably connected.

[0052] Container 1 is used to hold food ingredients, and its interior serves as a cavity for chopping the ingredients. In this embodiment, container 1 is bowl-shaped.

[0053] The top cover 2 has an opening in the center for exposing the upper end of the rotating shaft 41.

[0054] The motor 31 has a housing 32, and the housing 32 has a lower opening 33, through which the output shaft 311 of the motor 31 passes downward and is exposed.

[0055] The container 1, the top cover 2, and the main unit 3 are detachably connected. After connection, the rotating shaft 41 and the output shaft 311 are in contact.

[0056] The shredder in this embodiment uses a cutter shaft connection structure to prevent toner from falling off. The cutter shaft connection structure includes a rotating shaft 41 and an output shaft 311.

[0057] Specifically, in this embodiment, the rotating shaft 41 includes an upper opening, a lower opening, a cylindrical shaft 411, and a vertically elastically extendable connecting shaft 412 and a plug 414.

[0058] Specifically, in this embodiment, the main body of the connecting shaft 412 is columnar; the connecting shaft 412 is divided into an upper part 4121 and a lower part 4122; the radial dimension of the upper part 4121 is larger than the radial dimension of the lower part 4122; a spring 413 is sleeved on the outer periphery of the lower part 4122, and the upper part 4121 limits the upper end of the spring 413. The side surface of the upper part 4121 is provided with four vertically extending limiting ribs 4123 that are evenly distributed in the circumference.

[0059] The shaft 411 is sleeved on the outer periphery of the connecting shaft 412. The shaft 411 has an inner circumferential side surface; a vertically extending limiting groove 4111 is provided on the inner circumferential side surface; the upper end of the limiting groove 4111 does not extend to the upper opening, and the lower end extends to the edge of the lower opening; the cross-section of the limiting groove 4111 and the cross-section of the limiting rib 4123 are adapted to each other, so that the connecting shaft 412 is circumferentially limited relative to the shaft 411.

[0060] The lower end of the cutter shaft, i.e. the plug 414, is provided with a slot 4141 with the opening facing downward.

[0061] During the assembly of the cutting tool 4, the upper end of the connecting shaft 412 faces the lower opening of the shaft body 411, and the limiting rib 4123 is aligned with the limiting groove 4111, so that the connecting shaft 412 fits close to the shaft body 411. At the same time, the spring 413 is fitted around the lower part 4122 of the connecting shaft 412. In particular, the length of the spring 413 in its natural state is greater than the length of the lower part 4122 of the connecting shaft 412. Finally, the plug 414 is engaged with the lower opening to close the lower opening and to limit the movement of the bottom end of the connecting shaft 412. At this time, the lower end of the spring 413 and the plug 414 abut against each other. The limiting groove 4111 and the connecting shaft 412 prevent the connecting shaft 412 and the shaft body 411 from rotating relative to each other, and with the cooperation of the plug 414, the connecting shaft 412 is restricted within the shaft body 411 and cannot be separated. By setting spring 413, the connecting shaft 412 can be elastically extended and retracted vertically (axially).

[0062] In this embodiment, the cutter shaft connection structure also includes a fixing member 11; the fixing member 11 is located at the bottom of the rotating shaft 41; the fixing member 11 and the rotating shaft 41 are detachably connected, and the two are not mutually restricted in the circumferential direction, so that the two can rotate relative to each other.

[0063] The fixing member 11 is located at the center of the bottom of the container 1 and protrudes from the upper surface of the bottom. It is fixed by tightening screws. The fixing member 11 is inserted into the slot 4141 to connect the fixing member 11 and the rotating shaft 41. The rotating shaft 41 of the tool 4 is also vertically centered relative to the container 1.

[0064] The upper surface of the connecting shaft 412 is provided with a recessed, upward-facing connecting groove 4124, which is exposed at the upper end of the shaft body 411. Specifically, a circumferentially evenly distributed concave-convex structure is formed along the inner side of the connecting groove 4124, giving the cross-section of the connecting groove 4124 a flower-like shape. The radial dimension L1 of the connecting groove 4124 at the opening is larger than the radial dimension L2 at the bottom of the connecting groove 4124, forming a guide flare at the opening of the connecting groove 4124. Multiple discontinuous guide slopes 4125 are provided along the edge of the opening of the connecting groove 4124, and the guide slopes 4125 are located on the convex parts of the side of the connecting groove 4124; the guide slopes 4125 face obliquely upward.

[0065] In this embodiment, the output shaft 311 has a circumferentially distributed concave-convex structure on its side, making the cross-section of the output shaft 311 flower-shaped; the connecting groove 4124 and the lower end of the output shaft 311 have the same cross-sectional shape, but different sizes.

[0066] When cutting too much food or distributing it unevenly (such as compacted meat slices), the blade 4's rotating shaft 41 may become misaligned relative to the output shaft, but they can still make contact. By setting up an elastic telescopic structure, when the motor 31 starts rotating, the connecting shaft 412 will vibrate relative to the output shaft 311 under the power of the output shaft 311, including contraction, springback, and micro-angle rotation. During this process, the output shaft 311 and the connecting groove 4124 will gradually and automatically align until the transmission connection is achieved, thus realizing a stable self-adaptive connection without the need for manual positioning.

[0067] After the output shaft 311 and the connecting groove 4124 are inserted and fitted together, they are connected for transmission. After connection, the radial dimension of the connecting groove 4124 is larger than the radial dimension of the output shaft 311, and there is a gap between them, forming a collection groove 5. The radial dimension L1 of the connecting groove 4124 at the edge of the opening is larger than the radial dimension L3 of the lower opening 33. In addition, the radial dimension L4 of the upper end of the rotating shaft 41 is larger than the radial dimension L3 of the lower opening 33.

[0068] When too much toner accumulates inside the motor 31, it will fall down along the gap between the output shaft 311 and the lower opening 33 and eventually fall into the collection tank 5, rather than into the container 1 used for stirring and cutting food, thus avoiding contact and mixing between the toner and the food.

[0069] In this embodiment, the upper surface of the top cover 2 is provided with a recessed positioning groove 21, and the positioning groove 21 has an opening in the center; the positioning groove 21 is provided with multiple positioning ribs 22 that are evenly distributed around the circumference and oriented radially; the downward-facing surface of the main unit 3 is provided with an adapter groove 34 that matches the positioning ribs 22; one of the adapter grooves 34 is provided with a protective switch 35 that can be elastically extended and retracted up and down; after the top cover 2 and the main unit 3 are accurately assembled, one of the positioning ribs 22 presses against the protective switch 35; only when the protective switch 35 is pressed is the internal circuit of the main unit 3 connected. Through the precise cooperation between the positioning ribs 22 and the adapter groove 34 with the protective switch 35, the anti-misoperation interlock between the top cover 2 and the main unit 3 is realized, ensuring that the circuit can only be connected after accurate installation, effectively improving the safety of equipment operation.

[0070] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A cutter shaft connection structure for preventing toner drop, applied to a rotatable cutter; the cutter includes a vertically extending shaft, the upper end of which is connected to the output shaft of a motor; the cutter also includes cutter blades extending circumferentially from the side of the shaft; characterized in that: The cutter shaft connection structure includes the rotating shaft and the output shaft; The motor has a housing with a lower opening for the output shaft to pass through and be exposed downwards; the upper end of the shaft has a recessed connecting groove; the connecting groove and the lower end of the output shaft have the same cross-sectional shape and are both non-circular. The output shaft and the connecting slot are inserted into each other and connected in a transmission manner; After connection, the radial dimension of the connecting groove is greater than the radial dimension of the output shaft, and there is a gap between them to form a collection groove; the radial dimension of the connecting groove at the opening edge is greater than or equal to the radial dimension of the lower opening.

2. The cutter shaft connection structure for preventing toner drop according to claim 1, characterized in that: The radial dimension of the connecting groove at the opening is greater than the radial dimension of the bottom of the connecting groove; The end of the output shaft and the bottom side of the connecting groove are either tightly fitted or have a gap.

3. The cutter shaft connection structure for preventing toner drop according to claim 1, characterized in that: The output shaft has a circumferentially evenly distributed concave-convex structure on its side surface, making the cross-section of the output shaft flower-shaped or star-shaped; the inner side surface of the connecting groove is formed as a concave-convex structure that is misaligned with the output shaft.

4. The cutter shaft connection structure for preventing toner drop according to claim 3, characterized in that: A continuous guide slope is provided along the opening edge of the connecting groove; or multiple discontinuous guide slopes are provided, and the guide slopes correspond to the convex or concave parts located on the side of the connecting groove. The guide ramp faces diagonally upwards.

5. The cutter shaft connection structure for preventing toner drop according to claim 1, characterized in that: The radial dimension of the upper end of the shaft is greater than the radial dimension of the lower opening.

6. The cutter shaft connection structure for preventing toner drop according to claim 1, characterized in that: The cutter shaft connection structure also includes a fixing member; the fixing member is located at the bottom of the rotating shaft; the fixing member and the rotating shaft are detachably connected, and the two are not restricted in the circumferential direction, so that the two can rotate relative to each other; The fixing member has an upward-facing slot, into which the lower end of the cutter shaft is inserted; or the lower end of the cutter shaft has a downward-facing slot, into which the fixing member is inserted.

7. The cutter shaft connection structure for preventing toner drop according to claim 6, characterized in that: The rotating shaft includes a cylindrical shaft body with an open top and a vertically elastically telescopic connecting shaft. The upper end of the connecting shaft is provided with the connecting groove; the shaft body is sleeved on the outer periphery of the connecting shaft, and the connecting groove is exposed at the upper end of the shaft body; a spring is provided inside the shaft body and on the outer periphery of the connecting shaft, so that the connecting shaft is vertically elastically telescopic; the connecting shaft and the shaft body are circumferentially limited so that the two rotate as a single unit. The cutting tool is located inside the container, and the rotating shaft and the output shaft are both centered relative to the container.

8. The cutter shaft connection structure for preventing toner drop according to claim 7, characterized in that: The main body of the connecting shaft is columnar; the connecting shaft is divided into an upper part and a lower part; the radial dimension of the upper part is greater than the radial dimension of the lower part; the spring is sleeved on the outer periphery of the lower part, and the upper part limits the upper end of the spring; The upper side surface is provided with at least one vertically extending limiting rib; The shaft has an inner circumferential side surface; a vertically extending limiting groove is provided on the inner circumferential side surface; the upper end of the limiting groove does not extend to the upper opening; the cross-section of the limiting groove and the cross-section of the limiting rib are adapted to fit each other, so that the connecting shaft is circumferentially limited relative to the shaft.

9. The cutter shaft connection structure for preventing toner drop according to claim 8, characterized in that: The shaft has an opening at its lower end, and the limiting groove extends to the lower opening; the rotating shaft also includes a plug, which cooperates with the lower opening to close the lower opening and serves as a bottom movement limit for the connecting shaft.

10. A slitting machine, employing a cutter shaft connection structure for preventing toner drop as described in any one of claims 1 to 9; characterized in that: The shredder, from bottom to top, includes an upward-opening container, a top cover adapted to the opening of the container, and a main unit equipped with the motor and the housing; The blade is vertically positioned in the center of the container and is detachably connected; the container is used to hold food ingredients and serves as a cavity for chopping the food ingredients; the top cover has an opening in the center for exposing the connecting groove. The container, the top cover, and the main unit are detachably connected. After connection, the rotating shaft and the output shaft are in contact.

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