A stirring rod for a food processor

Abstract

The present invention relates to the technical field of food processing devices, and discloses a stirring rod for a food processing machine, comprising a knife shaft, a stirring knife, and a sleeve assembly, wherein the sleeve assembly comprises a fixed sleeve and a tube cover, wherein the sleeve is sleeved on the outside of the knife shaft, wherein the top end of the knife shaft is used to connect with a driving device, wherein the bottom end of the knife shaft extends into the tube cover through a positioning hole provided in the tube cover and is connected with the stirring knife, and further comprises a positioning member, wherein the positioning member comprises a positioning tube, wherein the positioning tube penetrates the positioning hole along the concentric direction of the positioning hole and cooperates with the sleeve, wherein the positioning tube can limit the sleeve and the stirring knife in the concentric direction of the positioning hole respectively. By means of the above-mentioned method, eccentricity can be prevented between the sleeve and the tube cover, thereby enabling the knife shaft to be assembled in the concentric direction of the sleeve and the tube cover, thereby ensuring stable transmission without eccentricity between the knife shaft and the output shaft of the driving device, and ensuring that the stirring knife has a stable rotation state in the same axial direction in the tube cover on the other hand.

Description

Technical Field

[0001] The invention relates to the technical field of food processing devices, and in particular to a stirring rod used in a food processing machine. Background Art

[0002] As people's living standards improve, various industrial food processors have gradually become simpler and more portable, transforming into various household appliances, including stirring rods for food processors, which are used to stir ingredients, reducing the labor burden of users.

[0003] A stirring rod for a food processor in the prior art includes a knife shaft connected to a stirring knife, a sleeve sleeved on the outside of the knife shaft, and a tube cover arranged around the stirring knife fixedly connected to the end of the sleeve. When the knife shaft is driven by an external driving device, the stirring knife rotates in the tube cover to cut the material.

[0004] For the stirring rod of the prior art, in order to locate the direction of the blade shaft, a stop element or a thrust bearing is usually arranged between the blade shaft and the sleeve, or a cover plate is arranged in the tube cover, and the blade shaft is stabilized in the axial direction through the hole arranged in the cover plate. In the above-mentioned scheme for stabilizing the blade shaft, the stop element, the thrust bearing, and the cover plate can stabilize the blade shaft in the axial direction to prevent the blade shaft from shaking during operation, but the stop element and the thrust bearing are structures installed in the sleeve, and the sleeve plays a positioning role for them. Therefore, the stabilizing effect of the stop element and the thrust bearing on the blade shaft will be affected by the positioning accuracy of the sleeve. Similarly, the cover plate is a structure positioned against the inner wall of the tube cover, so the stabilizing effect of the cover plate on the blade shaft is affected by the positioning accuracy of the tube cover.

[0005] In the prior art, the sleeve is fixed in the tube cover by welding. Since the welding surface between the sleeve and the tube cover cannot be flat, there is an eccentric error between the sleeve and the tube cover, which leads to the above-mentioned stabilizing knife shaft solution. The stabilizing effect of the stop element, thrust bearing, and cover plate on the knife shaft cannot be guaranteed, and the knife shaft will be installed and rotated in an eccentric state. When the knife shaft is installed in the sleeve in an eccentric state, the knife shaft will produce eccentricity when it cooperates with the output shaft of the driving device, which will cause the axially stabilized knife shaft to bend and deform under the eccentric force state, and during the operation of the stirring rod, vibration problems will occur and accompanied by noise; at the same time, the knife shaft cannot maintain stable concentricity with the sleeve and the tube cover, and the stirring knife connected to the bottom of the knife shaft cannot be fixed in one position and rotated due to eccentric shaking, resulting in a decrease in crushing efficiency, and there may be a problem of collision with the inner wall of the tube cover, affecting the safety of use.

[0006] This shows that the prior art needs to be further improved and enhanced. Summary of the invention

[0007] In order to solve one or more technical problems in the prior art, or at least provide a beneficial choice, the present invention provides a stirring rod for a food processing machine to prevent eccentricity between the sleeve and the tube cover, so that the knife shaft can be assembled in the concentric direction of the sleeve and the tube cover. On the one hand, stable transmission without eccentricity between the knife shaft and the output shaft of the driving device is ensured, and on the other hand, the stirring knife is ensured to have a stable rotation state in the same axial direction in the tube cover.

[0008] To achieve the above-mentioned purpose, the present invention provides a stirring rod for a food processing machine, including a knife shaft, a stirring knife, and a sleeve assembly. The sleeve assembly includes a fixed sleeve and a tube cover. The sleeve is sleeved on the outside of the knife shaft. The top end of the knife shaft is used to connect with a driving device. The bottom end of the knife shaft extends into the tube cover through a positioning hole set in the tube cover and is connected to the stirring knife. The present invention also includes a positioning member. The positioning member includes a positioning tube. The positioning tube passes through the positioning hole along the concentric direction of the positioning hole and cooperates with the sleeve. The positioning tube can limit the sleeve and the stirring knife in the concentric direction of the positioning hole respectively.

[0009] The present invention provides a stirring rod for a food processing machine, wherein a positioning tube passes through a positioning hole of a tube cover to be positioned in a concentric direction of the positioning hole, so that the positioning tube and the tube cover are in a concentric state, and a part of the positioning tube extends out of the tube cover in a concentric direction with the positioning hole. During assembly, the positioning tube extending out of the tube cover can be used to correct the assembly position of the sleeve relative to the tube cover, that is, the sleeve can be sleeved on the outer periphery of the positioning tube extending out of the tube cover, ensuring that the sleeve, the tube cover and the positioning tube are all limited in a concentric direction of the positioning hole, so that the knife shaft can be assembled to the concentric direction of the sleeve and the tube cover: on the one hand, it is ensured that the knife shaft is output from a drive device installed above the sleeve The shafts have good concentricity, and the knife shaft can rotate coaxially with the output shaft, thereby preventing the knife shaft from bending and deforming due to eccentric force during rotation, and reducing the vibration or noise of the stirring rod during operation. On the other hand, the positioning tube can limit the bearing or positioning structure at the bottom end of the knife shaft, so that the bottom end of the knife shaft can be stabilized in the concentric direction of the positioning tube, so that the stirring knife connected to the bottom end of the knife shaft can rotate stably in the concentric direction of the positioning tube, and the stirring knife will not shake eccentrically during operation, thereby not affecting its crushing efficiency, and avoiding collision between the stirring knife and the inner wall of the pipe cover.

[0010] In a preferred implementation, the positioning member further includes a limiting plate fixedly connected to the positioning tube. When the positioning tube is installed in place, the limiting plate and the inner wall of the tube cover abut against each other at the same horizontal height to limit the position.

[0011] The fixed limit of the positioning tube in the concentric direction of the positioning hole is guided and limited by the wall of the positioning hole on the one hand, and on the other hand, the limit plate, as a structure fixedly connected to the positioning tube, plays a role of straightening and limiting the positioning tube. When the limit plate and the inner wall of the pipe cover are abutted and limited at the same horizontal height, the limit plate abuts against the inner wall of the pipe cover without tilting, which can not only prevent the positioning tube from continuing to move axially, but also play a role of vertical alignment for the positioning member to be installed into the inner side of the pipe cover, so that the positioning tube can be naturally introduced into the positioning hole and positioned in the concentric direction of the positioning hole without tilting, ensuring that when the sleeve is installed, the sleeve can maintain a concentric state with the positioning hole and be sleeved on the outer periphery of the positioning tube, thereby ensuring the concentricity of the pipe cover and the sleeve; the knife shaft is installed in the pipe cover and the sleeve in a concentric state, and the rotating shaft of the knife shaft can be in line with the axis of the sleeve and the axis of the pipe cover. On the one hand, it is ensured that the top end of the knife shaft and the output shaft of the drive device can be coaxially connected and rotated, and on the other hand, it is ensured that the stirring knife connected to the bottom end of the knife shaft can rotate and cut materials in the pipe cover in a stable same axial state.

[0012] In a preferred implementation, the pipe cover is provided with a limiting portion, and when the positioning pipe is installed in place, the limiting portion is in radial contact with the pipe wall of the positioning pipe.

[0013] The limiting part plays a role of limiting and guiding the positioning tube during assembly, and cooperates with the limiting plate to play a vertical alignment effect on the positioning part installed into the pipe cover, thereby realizing fast and precise concentric position assembly; when installed or in working state, the limiting part plays a radial limiting role on the positioning tube, and cooperates with the abutment limiting effect of the inner wall of the pipe cover and the limiting plate, so that the pipe cover and the sleeve are not affected by vibration and have an eccentric tendency, thereby ensuring the concentric relationship between the pipe cover and the sleeve, and avoiding eccentric force that affects the structural strength of the pipe cover and the sleeve.

[0014] In a preferred implementation, the positioning hole wall forms a limiting portion; or, a sleeve in contact with the positioning tube wall is provided inside the tube cover in the direction of the positioning hole, and the limiting portion is formed on the sleeve.

[0015] By utilizing the existing structure of the pipe cover, i.e., the wall of the positioning hole, a limiting portion is formed to limit the positioning tube in the concentric direction of the positioning hole. On the one hand, there is no need to form a new limiting structure on the pipe cover, thereby reducing the investment in production costs. On the other hand, if other structures formed on the pipe cover are used as limiting portions, there will inevitably be processing errors that affect the positioning effect of the limiting portion on the positioning tube. By utilizing the positioning hole itself to limit the positioning tube in the concentric direction of the positioning hole, the influence of processing errors on the interference accuracy can be avoided. In another embodiment, the limiting portion is formed on a sleeve inside the pipe cover, and the sleeve can form a larger area of ​​radial limiting between the sleeve and the positioning tube, making it more difficult for the positioning tube to deviate from the concentric direction of the positioning hole, and the bottom of the sleeve can be used as a structure that abuts against the limiting plate to limit the position of the positioning member in the pipe cover, thereby affecting the positioning of the stirring knife in the pipe cover, so that the stirring knife can be set at a position that maintains a safe distance from the limiting plate and the inner wall of the pipe cover.

[0016] In a preferred implementation, a flange is provided at the end of the tube wall of the positioning tube passing through the positioning hole, and the flange forms an assembly guide between the sleeve and the tube cover along the concentric direction of the positioning tube.

[0017] Part of the positioning tube passes through the positioning hole and extends out of the tube cover. The positioning tube extending out of the tube cover is provided with an outward-flashed flange at the end of the tube wall. The flange can form an assembly guide for the sleeve along the concentric direction of the positioning tube, so that the positioning tube plays a straightening role in the assembly between the sleeve and the tube cover, preventing the sleeve from being socketed with the positioning tube at a large deflection angle, thereby reducing the sliding friction between the sleeve and the tube wall of the positioning tube during the socket assembly, making the entire assembly process smoother; and, by utilizing the smoothly transitioning arc surface between the flange and the tube wall of the positioning tube, the knife shaft can be smoothly introduced into the interior of the positioning tube, thereby making the assembly more convenient.

[0018] The arc of the flanged edge can be used to smoothly guide the positioning tube into the sleeve, thereby reducing the sliding friction generated during the assembly process of the pipe cover and the positioning tube; and the flanged edge can form an assembly guide for the sleeve along the concentric direction of the positioning tube, so that the positioning tube plays a straightening role in the assembly between the sleeve and the pipe cover, thereby ensuring the concentricity between the sleeve and the pipe cover.

[0019] In a preferred implementation, a positioning surface is provided at the top end of the pipe cover, and when the sleeve is installed in place, the positioning surface abuts against the bottom end surface of the sleeve.

[0020] After the casing is introduced into the outer periphery of the positioning tube through the flanging, the casing relies on the radial limitation between the flanging and the casing to maintain concentricity with the pipe cover, and the limiting effect of the flanging alone cannot implement the positioning of the casing. Therefore, a positioning surface is set at the top of the pipe cover, and the positioning surface can serve as a reference plane for straightening the casing, and perform axial abutment limitation with the casing, thereby ensuring the concentricity between the casing and the pipe cover; and the abutment between the casing and the positioning surface can be used as a welding line to fix the casing and the pipe cover, so that the casing and the pipe cover are welded in a concentric state.

[0021] In a preferred implementation, the upper sleeve of the knife shaft is provided with an upper bearing positioned by the wall of the casing, and the lower sleeve of the knife shaft is provided with a lower bearing positioned by the wall of the positioning tube. The upper bearing and the lower bearing can limit the rotation axis of the knife shaft to be in the coaxial direction of the casing and the positioning tube.

[0022] The upper bearing and the lower bearing are positioned by the sleeve and the positioning tube respectively. Since the positioning tube and the tube cover are concentrically arranged with respect to the center of the positioning hole, the coaxiality of the positioning tube and the tube cover can be guaranteed, so that the knife shaft can be extended along the coaxial direction of the sleeve and the positioning tube, thereby ensuring the coaxial fit between the top end of the knife shaft and the output shaft of the drive device, and also ensuring the positioning accuracy of the stirring knife connected to the bottom end of the knife shaft in the tube cover; the two bearings are respectively arranged at the upper and lower ends of the knife shaft transmission, which will involve the rotation axis of the entire knife shaft, thereby ensuring the coaxiality of the rotation axis, so that the knife shaft will not be eccentric and rotate stably.

[0023] In a preferred implementation, the cross-sectional shape of the pipe cover at the same horizontal height is an ellipse, and the shape of the limiting plate is adapted to the cross-sectional shape.

[0024] As for the cross-sectional shape of the tube cover, the ellipse makes it less likely for the limit plate to deflect and tilt compared to the circle, and the requirements for the fit between the limit plate and the inner wall of the tube cover are reduced. For example, for a circle, if the limit plate has multiple uneven abutment positions due to radial size errors, it will be necessary to use the lowest point contact as the standard, and the limit plate will deflect; while for an ellipse, if the limit plate has multiple uneven abutment positions due to radial size errors, as long as it does not affect a radial position of the short axis that first contacts the inner wall of the tube cover, the other radial positions will not contact the inner wall of the tube cover, and the limit plate will not contact the inner wall of the tube cover in a horizontal state, thereby improving the fault tolerance rate.

[0025] In a preferred implementation, one end of the positioning tube extends into the tube cover, and the other end extends into the sleeve, and the extending lengths are d1 and d2 respectively, and d1:d2 satisfies 0.5-1.5.

[0026] The ratio of the length of the positioning tube extending into the pipe cover to the length extending into the sleeve is limited to between 0.5 and 1.5, so that the length of the positioning tube extending into the pipe cover is equal to the length of the positioning tube extending into the sleeve, or one end is slightly longer than the other end, so as to ensure that the positioning tubes at each end have sufficient length; for the positioning tube in the sleeve, it extends out of the pipe cover and is positioned in the concentric direction of the positioning hole of the pipe cover, which can fully play a role in straightening the assembly of the sleeve, so that the sleeve and the pipe cover maintain a concentric relationship; for the positioning tube in the pipe cover, the limit plate makes the positioning tube at this end axially aligned with the positioning hole, so as to ensure that the positioning tube extending from the inside of the pipe cover to the outside of the pipe cover maintains a vertical state, and the positioning tube in a vertical state is used to limit the position of the sleeve and the pipe cover in a concentric direction. Through the above definition, it is avoided that the positioning tube at one end is too long, and then it is avoided that the positioning tube is also tilted through the positioning hole to pass through the pipe cover due to the limit plate being installed in the pipe cover, and finally the sleeve cannot be installed in the positioning tube.

[0027] In a preferred implementation, the bottom end of the blade shaft passes through the limit plate through a through hole provided in the limit plate and is connected to the stirring blade, and the axial distance d between the limit plate and the stirring blade satisfies 2≤d≤8mm.

[0028] Compared with the existing stirring rod, the limit plate is inserted into the tube cover, which can shorten the space above the stirring blade and prevent the material from being stopped by the stirring blade and hidden in the space above the stirring blade. By setting the axial distance between the limit plate and the stirring blade between 2 and 8 mm, a small-volume crushing chamber is formed between the limit plate and the tube cover. In the small-volume crushing chamber, the contact frequency between the material and the limit plate and the tube cover is enhanced. The reaction force of the limit plate and the tube cover on the material increases the frequency of the material contacting the stirring blade, thereby improving the crushing efficiency. When d is less than 2 mm, the distance between the stirring blade and the limit plate is too close, which may cause the top of the stirring blade to collide with the limit plate; when d is greater than 8 mm, the space between the limit plate and the stirring blade is large, which may cause the accumulation of material in the space, causing the rotation of the stirring blade to be blocked and affecting the crushing efficiency.

[0029] In a preferred implementation, the stirring knife has a blade, and the cut surface of the blade is arranged toward the limiting plate.

[0030] The mixing knife has a blade with its cut surface facing the limit plate, so that the mixing knife guides the material to be fed in the direction of the limit plate. The material then rebounds to the mixing knife due to the reaction force of the limit plate, forming secondary (or multiple) cutting, thereby improving the crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 FIG. 1 is an exploded view of a stirring rod for a food processor according to an embodiment of the present invention.

[0033] Figure 2 The figure is an exploded view of the sleeve, the pipe cover and the positioning member in one embodiment of the present invention.

[0034] Figure 3 It is a cross-sectional view of a stirring rod for a food processor according to one embodiment of the present invention.

[0035] Figure 4 It is a partial enlarged view of a stirring rod used in a food processor in another embodiment of the present invention.

[0036] Figure 5 It is a cross-sectional view of an assembly of a sleeve, a pipe cover, and a positioning member in one embodiment of the present invention.

[0037] Figure 6 The present invention is a cross-sectional view of a stirring rod for a food processor according to another embodiment of the present invention.

[0038] in:

[0039] 1- knife shaft, 11- upper bearing, 12- lower bearing;

[0040] 2-mixing knife, 21-blade;

[0041] 3- casing;

[0042] 4-pipe cover, 41-positioning hole, 42-limiting portion, 43-sleeve, 44-positioning surface, 45-limiting step, 46-notch, 47-concave package;

[0043] 5-positioning piece, 51-positioning tube, 511-flange, 52-limiting plate;

[0044] 6-Connector. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0046] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0047] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through a transition structure, but are connected to form a whole through a connecting structure. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0049] The following implementation methods are specifically adopted:

[0050] Combination Figures 1 to 5 As shown, the present invention provides a stirring rod for a food processing machine, including a knife shaft 1, a stirring knife 2, and a sleeve assembly, the sleeve assembly including a fixed sleeve 3 and a tube cover 4, the sleeve 3 is sleeved on the outside of the knife shaft 1, the top end of the knife shaft 1 is used to connect with a driving device, the bottom end of the knife shaft 1 extends into the tube cover 4 through a positioning hole 41 set in the tube cover 4 and is connected with the stirring knife 2, and also includes a positioning member 5, the positioning member 5 includes a positioning tube 51, the positioning tube 51 passes through the positioning hole 41 along the concentric direction of the positioning hole 41 and cooperates with the sleeve 3, the positioning tube 51 can limit the sleeve 3 and the stirring knife 2 in the concentric direction of the positioning hole 41 respectively.

[0051] The present invention provides a stirring rod for a food processing machine, wherein a sleeve 3 is sleeved on the outside of a knife shaft 1, a connector 6 is provided on the top of the sleeve 3, and a driving device of the food processing machine can be connected to the connector 6 so that the output shaft of the driving device can be transmission-connected with the top end of the knife shaft 1; a pipe cover 4 is fixedly connected to the bottom of the sleeve 3, the bottom end of the knife shaft 1 extends from the sleeve 3 to the inside of the pipe cover 4 through a positioning hole 41 provided on the pipe cover 4, and a stirring knife 2 is connected to the bottom end of the knife shaft 1, and the stirring knife 2 can rotate in the pipe cover 4 to cut food.

[0052] Among them, the stirring rod for a food processing machine provided by the present invention also includes a positioning member 5, and the positioning member 5 includes a positioning tube 51, and the positioning tube 51 penetrates the positioning hole 41 of the pipe cover 4 to be positioned in the concentric direction of the positioning hole 41, so that the positioning tube 51 and the pipe cover 4 are in a concentric state, and part of the positioning tube 51 extends out of the pipe cover 4 in the concentric direction of the positioning hole 41. During assembly, the positioning tube 51 extending out of the pipe cover 4 can be used to correct the assembly position of the sleeve 3 relative to the pipe cover 4, that is, the sleeve 3 can be sleeved on the outer periphery of the positioning tube 51 extending out of the pipe cover 4, ensuring that the sleeve 3, the pipe cover 4 and the positioning tube 51 are all limited to the concentric direction of the positioning hole 41, so that the knife shaft 1 can be assembled to the concentric direction of the sleeve 3 and the pipe cover 4.

[0053] On the one hand, the driving device is connected to the connector 6 arranged above the sleeve 3, and the output shaft of the driving device will be connected to the lower knife shaft 1 in a coaxial state with the sleeve 3, ensuring the concentricity between the sleeve 3 and the pipe cover 4. The knife shaft 1 that can be fixed on the inner side of the sleeve 3 is assembled in a coaxial state with the sleeve 3, thereby ensuring good concentricity between the knife shaft 1 and the output shaft. The knife shaft 1 can rotate coaxially with the output shaft, thereby preventing the problem of bending and deformation caused by eccentric force during the rotation of the knife shaft 1, and at the same time reducing the vibration or noise of the stirring rod during operation.

[0054] On the other hand, the positioning tube 51 receives the sleeve 3 downward, and can limit the bearing or positioning structure at the bottom end of the blade shaft 1, so that the bottom end of the blade shaft 1 can be stabilized in the concentric direction of the positioning tube 51, and the stirring blade 2 connected to the bottom end of the blade shaft 1 can have a stable rotation state in the concentric direction of the positioning tube 51 in the pipe cover 4, and the stirring blade 2 will not eccentrically shake during operation, thereby not affecting its crushing efficiency, and avoiding collision between the stirring blade 2 and the inner wall of the pipe cover 4.

[0055] As a preferred embodiment of the present invention, Figures 3 to 5 As shown, the positioning member 5 further includes a limiting plate 52 fixedly connected to the positioning tube 51 . When the positioning tube 51 is installed in place, the limiting plate 52 abuts against the inner wall of the pipe cover 4 at the same level to limit the position.

[0056] exist Figure 3 In the illustrated embodiment, the bottom end of the positioning tube 51 is fixedly connected to a limiting plate 52, and the limiting plate 52 is perpendicular to the axis of the positioning tube 51. The pipe cover 4 is an inverted bowl-shaped structure, and the shape of its inner wall plays a decisive role in the depth at which the limiting plate 52 is fixed in the pipe cover 4. When the cross-sectional shape of the inner wall of the pipe cover 4 at a certain horizontal height is adapted to the shape of the limiting plate 52, the limiting plate 52 will be abutted by the inner wall of the pipe cover 4 at that horizontal height in a horizontal state and be limited at that horizontal height, and cannot continue to move forward. At the same time, part of the positioning tube 51 extends out of the pipe cover 4 through the positioning hole 41 set at the top of the pipe cover 4.

[0057] It can be understood that the fixed limit of the positioning tube 51 in the concentric direction of the positioning hole 41 is guided and limited by the wall of the positioning hole 41 on the one hand, and on the other hand, the limit plate 52, as a structure fixedly connected to the positioning tube 51, plays a role of straightening and limiting the positioning tube 51. When the limit plate 52 and the inner wall of the pipe cover 4 are abutted and limited at the same horizontal height, the limit plate 52 abuts against the inner wall of the pipe cover 4 without tilting, which can not only prevent the positioning tube 51 from continuing to move axially, but also play a role of vertical alignment for the positioning member 5 to be installed into the inner side of the pipe cover 4, so that the positioning tube 51 can be naturally introduced into the positioning hole 41 and positioned in the concentric direction of the positioning hole 41 without tilting, ensuring that when the sleeve 3 is installed, the sleeve 3 can remain concentric with the positioning hole 41 and be sleeved on the outer periphery of the positioning tube 51, thereby ensuring the concentricity of the pipe cover 4 and the sleeve 3.

[0058] Due to the cooperation of the limit plate 52 and the positioning tube 51, the positioning member 5 can straighten the sleeve 3 and enable the sleeve 3 and the pipe cover 4 to be assembled together concentrically, and the knife shaft 1 is installed in the pipe cover 4 and the sleeve 3 in a concentric state, so that the rotating axis of the knife shaft 1 can be colinear with the axis of the sleeve 3 and the axis of the pipe cover 4. On the one hand, it ensures that the top end of the knife shaft 1 and the output shaft of the drive device can be coaxially connected and rotated, and on the other hand, it ensures that the stirring knife 2 connected to the bottom end of the knife shaft 1 can rotate in the pipe cover 4 in a stable manner in the same axial state to cut materials.

[0059] From the perspective of assembly, the positioning piece 5 is installed into the tube cover 4 from the bottom of the tube cover 4. Since the limiting plate 52 blocks the line of sight of the positioning tube 51, it will be inconvenient for the operator to observe the alignment state of the positioning tube 51 and the positioning hole 41, which may cause the positioning tube 51 to pass through the positioning hole 41 in an eccentric state when the positioning piece 5 is pushed into the tube cover 4; and in the process of the operator pushing the positioning piece 5 into the tube cover 4, the limiting plate 52 gradually contacts the inner wall of the tube cover 4 and guides the positioning piece 5 in the assembly direction. During the process, the direction of the positioning tube 51 can be gradually straightened toward the positioning hole 41, so that the positioning tube 51 can be naturally introduced into the positioning hole 41 and is positioned concentrically with the positioning hole 41 without tilting.

[0060] It should be noted that the present invention does not specifically limit the shape of the pipe cover 4 and the structure of the inner wall of the pipe cover 4, which can be set to Figure 3 In the embodiment shown, the positioning height of the stop plate 52 in the pipe cover 4 is determined by the degree of fit between its own shape and the inner wall shape of the pipe cover 4. Therefore, the positioning height can fluctuate slightly according to the error of the processing size of the stop plate 52 without affecting the placement position of the positioning tube 51. In another embodiment, as Figure 4As shown, a limiting step 45 is added to the inner wall of the pipe cover 4, and the limiting step 45 directly determines the height of the limiting plate 52 in the pipe cover 4, so that the positioning of the limiting plate 52 (including the distance between the limiting plate 52 and the mixing blade 2, and the distance from the limiting plate 52 to the bottom of the pipe cover 4) is more precise.

[0061] As a more preferred embodiment of the present invention, Figures 3 to 5 As shown, the pipe cover 4 is provided with a limiting portion 42 . When the positioning pipe 51 is installed in place, the limiting portion 42 abuts against the pipe wall of the positioning pipe 51 in radial direction.

[0062] The limiting portion 42 serves to limit and guide the positioning tube 51 during assembly, and cooperates with the limiting plate 52 to vertically align the positioning member 5 when it is installed into the pipe cover 4, thereby realizing fast and precise concentric position assembly; when installed or in working condition, the limiting portion 42 serves to limit the positioning tube 51 in the radial direction, and cooperates with the abutment limiting effect of the inner wall of the pipe cover 4 and the limiting plate 52, so that the pipe cover 4 and the sleeve 3 are not affected by vibration and tend to be eccentric, thereby ensuring the concentric relationship between the pipe cover 4 and the sleeve 3, and avoiding eccentric force that affects the structural strength of the pipe cover 4 and the sleeve 3.

[0063] The present invention does not specifically limit the formation method of the “limiting portion 42”, and it can adopt any one of the following embodiments:

[0064] Embodiment 1: Figure 3 and Figure 4 As shown, the wall of the positioning hole 41 forms a limiting portion 42 .

[0065] In this embodiment, the existing structure of the pipe cover 4, that is, the wall of the positioning hole 41, is used to form a limiting portion 42 that limits the positioning tube 51 in the concentric direction of the positioning hole 41. The positioning tube 51 extends out of the pipe cover 4 through the guidance of the wall of the positioning hole 41, and can be radially limited by the wall of the positioning hole 41 to prevent the positioning tube 51 from deviating from the concentric direction of the positioning hole 41. By adopting the above method, on the one hand, there is no need to form a new limiting structure on the pipe cover 4, which reduces the investment in production costs. On the other hand, if other structures formed on the pipe cover 4 are used as the limiting portion 42, there will inevitably be processing errors that affect the positioning effect of the limiting portion 42 on the positioning tube 51. By using the positioning hole 41 itself to limit the positioning tube 51 in the concentric direction of the positioning hole 41, the influence of processing errors on interference accuracy can be avoided.

[0066] Embodiment 2: Figure 5 As shown, a sleeve 43 in contact with the wall of the positioning tube 51 is provided inside the pipe cover 4 in the direction of the positioning hole 41 , and the limiting portion 42 is formed on the sleeve 43 .

[0067] The sleeve 3 is installed in alignment with the pipe cover 4 through the positioning tube 51 extending out of the pipe cover 4. In the process of pushing the sleeve 3 to the outer periphery of the positioning tube 51, the sleeve 3 may be tilted due to human factors. If the limiting effect between the positioning tube 51 and the pipe cover 4 is not good, the positioning tube 51 will be eccentric due to the action of the sleeve 3.

[0068] In order to enhance the limiting effect between the positioning tube 51 and the sleeve 3, the limiting portion 42 of this embodiment is formed on the sleeve 43 inside the pipe cover 4. Compared with the technical solution of the first embodiment, the sleeve 43 can form a larger area of ​​radial limiting between the positioning tube 51, making it more difficult for the positioning tube 51 to deviate from the concentric direction of the positioning hole 41. In addition, the bottom of the sleeve 43 can be used as a structure for abutting and limiting with the limiting plate 52, limiting the position of the positioning member 5 in the pipe cover 4, thereby affecting the positioning of the mixing blade 2 in the pipe cover 4, so that the mixing blade 2 can be set at a position that maintains a safe distance from the limiting plate 52 and the inner wall of the pipe cover 4. Preferably, the axial height h of the sleeve is ≥ 10 mm.

[0069] As a preferred embodiment of the present invention, Figures 3 to 5 As shown, the positioning tube 51 is provided with a flange 511 at the end of the tube wall passing through the positioning hole 41 , and the flange 511 forms an assembly guide between the sleeve 3 and the tube cover 4 along the concentric direction of the positioning tube 51 .

[0070] Part of the positioning tube 51 passes through the positioning hole 41 and extends out of the tube cover 4. The positioning tube 51 extending out of the tube cover 4 is provided with an outwardly expanded flange 511 at the end of the tube wall. The flange 511 can form an assembly guide for the sleeve 3 along the concentric direction of the positioning tube 51, so that the positioning tube 51 plays a straightening role in the assembly between the sleeve 3 and the tube cover 4, preventing the sleeve 3 from being sleeved with the positioning tube 51 at a large deflection angle, thereby reducing the sliding friction generated between the sleeve 3 and the tube wall of the positioning tube 51 during the sleeve assembly, making the entire assembly process smoother; and, since the caliber of the tube wall of the positioning tube 51 is smaller than that of the tube wall of the sleeve 3, in the process of extending the knife shaft 1 from one side of the sleeve 3 into the interior of the positioning tube 51, it is easy to be blocked by the tube wall of the positioning tube 51, making the assembly process not smooth. At this time, the arc surface with a smooth transition between the flange 511 and the tube wall of the positioning tube 51 can be used to smoothly introduce the knife shaft 1 into the interior of the positioning tube 51, thereby making the assembly more convenient.

[0071] It should be noted that the present invention does not specifically limit the matching relationship between the "positioning tube 51" and the "sleeve 3". Figure 3As shown, the flange 511 is used to straighten the assembly direction of the sleeve 3, so that the sleeve 3 can be sleeved on the outer periphery of the positioning tube 51 along the concentric direction of the positioning tube 51. When the positioning tube 51 is sleeved into the sleeve 3, the sleeve 3 and the positioning tube 51 remain concentric, and there is a distance between the sleeve 3 and the positioning tube 51 below the flange 511; in another embodiment, the positioning tube 51 extends out of the pipe cover 4 for a certain length along the concentric direction of the positioning hole 41, and the sleeve 3 and the positioning tube 51 extending out of the pipe cover 4 can have an interference fit. In cooperation, the axial straightening and guiding of the sleeve 3 is carried out through the tube wall of the positioning tube 51, so that the sleeve 3 is finally sleeved on the outer periphery of the positioning tube 51 in the concentric direction of the positioning tube 51; in another embodiment, part of the positioning tube 51 extends out of the tube cover 4 in the concentric direction of the positioning hole 41, and the outer tube wall of the positioning tube 51 extending out of the tube cover 4 is provided with an external thread, and the inner tube wall of the sleeve 3 is correspondingly provided with an internal thread, and the sleeve 3 and the positioning tube 51 are finally assembled together through threaded connection, and the sleeve 3 and the positioning tube 51 are kept in the concentric direction.

[0072] As a more preferred embodiment of the present invention, Figures 3 to 5 As shown, a positioning surface 44 is provided at the top end of the pipe cover 4. When the sleeve 3 is installed in place, the positioning surface 44 abuts against the bottom end surface of the sleeve 3.

[0073] After the sleeve 3 is introduced into the outer periphery of the positioning tube 51 through the flange 511, the sleeve 3 relies on the radial limit between the flange 511 to maintain the concentricity with the pipe cover 4, and the limiting effect of the flange 511 alone cannot implement the positioning of the sleeve 3. Therefore, a positioning surface 44 is set at the top of the pipe cover 4. The positioning surface 44 is distributed on the outer periphery of the positioning hole 41 as a plane structure, which can serve as a reference plane for straightening the sleeve 3 and axially abutting and limiting the sleeve 3, thereby ensuring the concentricity between the sleeve 3 and the pipe cover 4. In addition, the abutment between the sleeve 3 and the positioning surface 44 can be used as a welding line to fix the sleeve 3 and the pipe cover 4, so that the sleeve 3 and the pipe cover 4 are welded in a concentric state. It should be noted that the present invention does not specifically limit the matching mode of the sleeve 3 and the positioning tube 51. In another embodiment, the outer wall of the positioning tube 51 is provided with an external thread, and the inner wall of the sleeve 3 is provided with an internal thread. The positioning tube 51 is fixedly connected with the sleeve 3 by threaded connection.

[0074] During assembly, the flange 511 can play a guiding role, facilitating the insertion of the positioning tube 51 into the sleeve 3. Due to the structure of the flange 511, there is a gap between the positioning tube 51 and the sleeve 3, and the sleeve 3 is sleeved on the outer periphery of the positioning tube 51 in a state of maintaining a gap with the positioning tube 51. The gap can firstly reduce the sliding friction between the positioning tube 51 and the sleeve 3 during the installation process, facilitating assembly; secondly, the gap can reduce the contact area between the positioning tube 51 and the pipe cover 4, thereby reducing the vibration transmission effect between the two; and, if the sleeve 3 and the pipe cover 4 are fixedly connected by welding, the gap can increase the distance between the welding line and the positioning hole 41, preventing the molten welding liquid from penetrating into the positioning hole 41 and solidifying at the positioning hole 41, thereby preventing the aperture of the positioning hole 41 from changing and causing the positioning hole 41 to be eccentric with the positioning tube 51.

[0075] As a preferred embodiment of the present invention, Figure 3 As shown, the upper part of the knife shaft 1 is provided with an upper bearing 11 positioned by the wall of the sleeve 3, and the lower part of the knife shaft 1 is provided with a lower bearing 12 positioned by the wall of the positioning tube 51. The upper bearing 11 and the lower bearing 12 can limit the rotation axis of the knife shaft 1 to be in the coaxial direction of the sleeve 3 and the positioning tube 51.

[0076] The upper part of the blade shaft 1 is sleeved with an upper bearing 11, which is positioned by the wall of the sleeve 3, and the lower part of the blade shaft 1 is sleeved with a lower bearing 12, which is positioned by the wall of the positioning tube 51. Since the positioning tube 51 and the pipe cover 4 are concentrically arranged with respect to the center of the positioning hole 41, the coaxiality of the positioning tube 51 and the pipe cover 4 can be ensured, so that the blade shaft 1 can be extended along the coaxial direction of the sleeve 3 and the positioning tube 51, thereby ensuring the coaxial fit between the top end of the blade shaft 1 and the output shaft of the driving device, and also ensuring the positioning accuracy of the stirring blade 2 connected to the bottom end of the blade shaft 1 in the pipe cover 4; the two bearings are respectively arranged at the upper and lower ends of the blade shaft 1 transmission, which will involve the rotation axis of the entire blade shaft 1, thereby ensuring the coaxiality of the rotation axis, so that the blade shaft 1 does not eccentrically rotate and rotates stably.

[0077] As a preferred embodiment of the present invention, Figure 6 As shown, one end of the positioning tube 51 extends into the tube cover 4, and the other end extends into the sleeve 3, and the extending lengths are d1 and d2 respectively, and d1:d2 satisfies 0.5-1.5.

[0078] The ratio of the length of the positioning tube 51 extending into the pipe cover 4 to the length of the positioning tube 51 extending into the sleeve 3 is limited to between 0.5 and 1.5, so that the length of the positioning tube 51 extending into the pipe cover 4 is maintained equal to the length of the positioning tube 51 extending into the sleeve 3, or one end is slightly longer than the other end, so as to ensure that the positioning tube 51 at each end has a sufficient length; for the positioning tube 51 in the sleeve 3, it extends out of the pipe cover 4 and is positioned in the concentric direction of the positioning hole 41 of the pipe cover 4, which can fully play a straightening role in the assembly of the sleeve 3, so that the sleeve 3 and the pipe cover 4 maintain a concentric relationship; for the positioning tube 51 in the pipe cover 4, the limit plate 52 axially aligns the positioning tube 51 at this end with the positioning hole 41, so as to ensure that the positioning tube 51 extending from the inside of the pipe cover 4 to the outside of the pipe cover 4 maintains a vertical state, and the positioning tube 51 in the vertical state is used to limit the positions of the sleeve 3 and the pipe cover 4 in a concentric direction. Through the above definition, it is avoided that the positioning tube 51 at one end is too long, and further it is avoided that the positioning tube 51 is also tilted through the positioning hole 41 and out of the tube cover 4 due to the limit plate 52 being installed in the tube cover 4, and finally the sleeve 3 cannot be installed in the positioning tube 51. Preferably, the length d1 of the positioning tube 51 inserted into the tube cover 4 and the length d2 of the positioning tube 51 inserted into the sleeve 3 meet the following conditions: d1:d2=0.8~1.2; for example, in a preferred embodiment, the length d1 of the positioning tube 51 inserted into the tube cover 4 is selected to be 24mm, and the length d2 of the positioning tube 51 inserted into the sleeve 3 is selected to be 20mm, so that d1:d2=1.2.

[0079] As a preferred embodiment of the present invention, Figure 1 As shown, a notch 46 is provided at the bottom end of the pipe cover 4 , and a concave bag 47 is formed by internal pressure on the inner wall of the pipe cover 4 at the notch 46 .

[0080] exist Figure 1 In the embodiment shown, a plurality of circumferentially evenly distributed notches 46 are provided at the bottom end of the pipe cover 4, and the notches 46 are used for feeding, so that the materials can enter the pipe cover 4 and contact and cut with the stirring blade 2. In the existing stirring rod, the inner wall of the pipe cover 4 is usually a smooth curved surface, which has a small flow resistance to the fluid along the inner wall of the pipe cover 4. When working, the fluid is easily stirred by the stirring blade 2 to generate a large vortex along the inner wall of the pipe cover 4, resulting in a large vacuum inside the pipe cover 4, and then causing a large pressure on the pipe cover 4; in the present invention, the inner wall of the pipe cover 4 at the notch 46 forms a concave bag 47 by internal pressure, and the concave bag 47 and the notch 46 are evenly distributed on the inner wall of the pipe cover 4 along the circumference, so that the inner wall of the pipe cover 4 increases the flow resistance of the fluid, and then increases the turbulent effect of the fluid flow, greatly reduces the generation of vortices, reduces the vacuum inside the pipe cover 4, and thus reduces the pressure on the pipe cover 4.

[0081] As a preferred embodiment of the present invention, the cross-sectional shape of the pipe cover 4 at the same horizontal height is an ellipse, and the shape of the limiting plate 52 is adapted to the cross-sectional shape.

[0082] As for the cross-sectional shape of the pipe cover 4, the oval shape makes it less likely for the stop plate 52 to deflect and tilt compared to the circular shape, and the requirements for the coordination between the stop plate 52 and the inner wall of the pipe cover 4 are reduced. For example, for a circular shape, if the stop plate 52 has multiple uneven abutting positions due to radial dimension errors, it will cause the stop plate 52 to deflect based on the contact at the lowest point; while for an ellipse, if the stop plate 52 has multiple uneven abutting positions due to radial dimension errors, as long as it does not affect a radial position of the short axis that first contacts the inner wall of the pipe cover 4, the other radial positions will not contact the inner wall of the pipe cover 4, and the stop plate 52 will not contact the inner wall of the pipe cover 4 in a horizontal state, thereby improving the fault tolerance rate, and further ensuring the stop plate 52's straightening effect on the positioning tube 51. In addition, the pipe cover 4 with an oval cross section can stop the deflection of the stop plate 52 in the pipe cover 4 caused by vibration, thereby improving the limiting effect between the positioning member 5 and the pipe cover 4.

[0083] As a preferred embodiment of the present invention, Figure 3 As shown, the bottom end of the blade shaft 1 passes through the limit plate 52 through a through hole provided on the limit plate 52 and is connected to the stirring blade 2. The axial distance d between the limit plate 52 and the stirring blade 2 satisfies 2≤d≤8mm.

[0084] Compared with the existing stirring rod, the limit plate 52 is inserted into the pipe cover 4, which can shorten the upper space of the stirring blade 2, and prevent the material from being stopped by the stirring blade 2 and hidden in the upper space of the stirring blade 2. By setting the axial distance between the limit plate 52 and the stirring blade 2 to be between 2 and 8 mm, a small-volume crushing chamber is formed between the limit plate 52 and the pipe cover 4. In the small-volume crushing chamber, the contact frequency between the material and the limit plate 52 and the pipe cover 4 is enhanced, and the material rebounds toward the stirring blade 2 through the reaction force of the limit plate 52 and the pipe cover 4, so that the frequency of the material contacting the stirring blade 2 is increased, thereby improving the crushing efficiency. When d is less than 2 mm, the distance between the stirring blade 2 and the limit plate 52 is too close, which may cause the top of the stirring blade 2 to collide with the limit plate 52; when d is greater than 8 mm, the space between the limit plate 52 and the stirring blade 2 is large, which may cause the accumulation of materials in the space, resulting in the obstruction of the rotation of the stirring blade 2 and affecting the crushing efficiency.

[0085] As a preferred embodiment of the present invention, Figure 3 As shown, the axial distance D between the limiting plate 52 and the bottom end of the pipe cover 4 satisfies D≤20mm. By limiting the axial distance between the limiting plate 52 and the bottom end of the pipe cover 4, the space formed by the pipe cover 4 and the limiting plate 52 is reduced, so that the material can collide with the inner wall of the pipe cover 4 or the limiting plate 52 in the space at a higher frequency, thereby enhancing the turbulent effect of the material flow, and further enhancing the contact frequency between the material and the stirring blade 2 to improve the crushing efficiency.

[0086] As a preferred embodiment of the present invention, Figure 3 As shown, the stirring blade 2 has a blade 21 , and the cut surface of the blade 21 is arranged toward the limiting plate 52 .

[0087] The mixing blade 2 has a blade 21 with its cut surface facing the limiting plate 52, so that the mixing blade 2 guides the material to be fed in the direction of the limiting plate 52. The material then rebounds to the mixing blade 2 due to the reaction force of the limiting plate 52, forming secondary (or multiple) cutting, thereby improving the crushing efficiency.

[0088] The technical solution protected by the present invention is not limited to the above-mentioned embodiments. It should be pointed out that the combination of the technical solution of any one embodiment with the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A stirring rod for a food processor, comprising a blade shaft, a stirring blade, and a sleeve assembly, wherein the sleeve assembly comprises a sleeve and a tube cover which are fixedly connected, wherein the sleeve is sleeved outside the blade shaft, wherein the top end of the blade shaft is used to be connected to a driving device, and the bottom end of the blade shaft extends into the tube cover through a positioning hole provided in the tube cover and is connected to the stirring blade, wherein: It also includes a positioning member, which includes a positioning tube. The positioning tube passes through the positioning hole along the concentric direction of the positioning hole and cooperates with the sleeve. The positioning tube can limit the sleeve and the stirring knife in the concentric direction of the positioning hole respectively; the positioning member also includes a limiting plate fixedly connected to the positioning tube. When the positioning tube is installed in place, the limiting plate and the inner wall of the pipe cover are abutted and limited at the same horizontal height.

2. A stirring rod for a food processor according to claim 1, characterized in that: The pipe cover is provided with a limiting portion, and when the positioning pipe is installed in place, the limiting portion is in radial contact with the pipe wall of the positioning pipe.

3. A stirring rod for a food processor according to claim 2, characterized in that: The positioning hole wall forms the limiting portion; or, a sleeve in contact with the positioning tube wall is provided inside the tube cover in the direction of the positioning hole, and the limiting portion is formed on the sleeve.

4. A stirring rod for a food processor according to claim 1, characterized in that: The positioning tube is provided with a flange at the end of the tube wall passing through the positioning hole, and the flange forms an assembly guide between the sleeve and the tube cover along the concentric direction of the positioning tube.

5. A stirring rod for a food processor according to claim 4, characterized in that: A positioning surface is provided at the top end of the pipe cover, and when the sleeve is installed in place, the positioning surface abuts against the bottom end surface of the sleeve.

6. A stirring rod for a food processor according to claim 1, characterized in that: The upper sleeve of the knife shaft is provided with an upper bearing positioned by the wall of the sleeve, and the lower sleeve of the knife shaft is provided with a lower bearing positioned by the wall of the positioning tube. The upper bearing and the lower bearing can limit the rotation axis of the knife shaft to be in the coaxial direction of the sleeve and the positioning tube.

7. A stirring rod for a food processor according to claim 1, characterized in that: One end of the positioning tube extends into the tube cover, and the other end extends into the sleeve, and the extending lengths are d1 and d2 respectively, and d1:d2 satisfies 0.5-1.

5.

8. The stirring rod for a food processor according to claim 1, characterized in that: The cross-sectional shape of the pipe cover at the same horizontal height is an ellipse, and the shape of the limiting plate is adapted to the cross-sectional shape.

9. The stirring rod for a food processor according to claim 1, characterized in that: The bottom end of the blade shaft passes through the limit plate through a through hole arranged on the limit plate and is connected to the stirring blade, and an axial distance d between the limit plate and the stirring blade satisfies, 2≤d≤8mm; and / or, the stirring blade has a blade, and the cut surface of the blade is arranged toward the limit plate.

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