Extrusion screw and juicer

Abstract

The utility model discloses an extrusion screw rod, which belongs to the field of food processing equipment and comprises a screw rod main body, and the screw rod main body comprises a feeding end; a spiral convex rib used for extruding or crushing fruits and vegetables is arranged on the side, close to the feeding end, of the peripheral side of the screw main body, and the spiral convex rib forms a first extrusion section; the extrusion screw further comprises an independent grinding section, fruits and vegetables enter the grinding section after being extruded from the first extrusion section, and the grinding section comprises an outer flange formed by extending outwards in the radial direction and a grinding part arranged on the outer flange. The utility model further discloses a normal juice machine adopting the extrusion screw rod. The normal juice machine has the advantage that the grinding effect can be improved.

Description

[Technical Field]

[0001] This utility model relates to an extrusion screw and a juicer, belonging to the field of food processing equipment. [Background Technology]

[0002] With the advancement of technology and the improvement of living standards, slow juicers or juicers are becoming increasingly popular. The main structure of a slow juicer or juicer includes a main body and a juicing component connected to the main body. The juicing component usually includes a squeezing screw and a squeezing cylinder. The principle is to allow the squeezing screw to rotate inside the squeezing cylinder, thereby squeezing the liquid out of the fruits and vegetables to be squeezed between the squeezing screw and the squeezing cylinder.

[0003] Currently, traditional extrusion screws typically process fruits and vegetables from large pieces into the feed end, where they undergo crushing and extrusion steps to become small pieces of pulp. To achieve finer juicing, some juicers also have a grinding layer, but these grinding layers are usually integrated with the spiral ribs of the crushing and extrusion process, resulting in poor grinding performance. [Utility Model Content]

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a juicer that can improve the grinding effect.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An extrusion screw, comprising:

[0007] The screw body includes a feed end;

[0008] The outer periphery of the screw body is provided with a spiral rib for extruding or crushing fruits and vegetables on the side near the feed end, and the spiral rib forms the first extrusion section;

[0009] The extrusion screw also includes a separate grinding section. Fruits and vegetables are extruded from the first extrusion section and then enter the grinding section. The grinding section includes an outer flange extending radially outward and a grinding part disposed on the outer flange.

[0010] The beneficial effects of using this utility model are as follows:

[0011] In this invention, the first extrusion section of the extrusion screw is mainly used to crush large pieces of fruit pulp from the feed. As the fruit pulp passes through the first extrusion section, the large pieces are gradually cut and broken into small particles. These smaller particles are more easily slid down with the liquid. The grinding section in this invention forms a separate outer flange in the radial direction, similar to a step, with the grinding part located on the outer flange. The advantages of this design are:

[0012] First, it can buffer the feeding process. At this stage, the pulp has been basically broken into small particles, and some of it will fall quickly with the fluid. The stepped outer flange can effectively slow down the feeding speed, so that this part of the pulp can be fully ground in the grinding section.

[0013] Secondly, the grinding is more thorough. In the first extrusion stage, the fruits and vegetables are mostly subjected to horizontal extrusion force from the side, and there is a large extrusion space in the vertical direction. After being subjected to force, they may tend to be extruded downwards. However, when grinding is carried out on the outer flange, the fruits and vegetables are squeezed between the top of the outer flange and the inner wall of the extrusion cylinder. The fruits and vegetables are mostly subjected to extrusion force from the top and bottom, and the lateral extrusion space is limited. This means that the fruits and vegetables can only be ground in this area. This grinding method greatly reduces the chance of fruit pulp being missed, making the grinding more thorough.

[0014] Preferably, the grinding section includes at least one first tooth-shaped portion disposed on the outer peripheral side of the screw body.

[0015] Preferably, the top surface of the outer flange includes an inclined surface, and the first tooth-shaped portion is disposed on the inclined surface.

[0016] Preferably, the inclined surface of the top surface of the outer flange has an inclination angle of 3° to 45° relative to the horizontal plane.

[0017] Preferably, the extrusion screw has a flow channel on the grinding section for the continued flow of fruits and vegetables.

[0018] Preferably, the flow channel includes a first channel, the first channel including a notch at the top of the outer flange, the notch extending to the sidewall of the outer flange; and / or, the flow channel includes at least two spaced ribs on the sidewall of the outer flange, with a second flow channel formed between adjacent spaced ribs.

[0019] Preferably, the grinding section is integral with the screw body; or, a grinding sleeve is provided on the outside of the screw body, the grinding sleeve includes the grinding section, and the grinding sleeve is a metal body.

[0020] This utility model also discloses a juicer, including a main body, a feeding assembly, and a pressing assembly. The main body is provided with a driver, and the pressing assembly includes a pressing cylinder and a pressing screw at least partially disposed in the pressing cylinder. The driver is drivenly connected to the pressing screw to make the pressing screw rotate in the pressing cylinder. The pressing screw adopts any of the pressing screws described above.

[0021] Preferably, the grinding section includes at least one first tooth-shaped portion disposed on the outer periphery of the screw body, and the inner wall of the extrusion cylinder is provided with a second tooth-shaped portion that matches the first tooth-shaped portion.

[0022] Preferably, the grinding section includes an outer flange formed by the radial outward extension of the screw body, the first toothed portion is provided on the outer flange, and the extrusion cylinder is provided with an outer convex ring corresponding to the outer flange.

[0023] Preferably, the top surface of the outer flange includes an inclined surface, the first toothed portion is disposed on the inclined surface, and a second toothed portion is disposed on the inner wall of the outer ring corresponding to the position of the first toothed portion.

[0024] Preferably, the compression gap between the first toothed portion and the second toothed portion is 0.1 mm to 0.5 mm.

[0025] Preferably, there are at least two spaced ribs on the sidewall of the outer flange, and a second flow channel is formed between adjacent spaced ribs. The gap between the spaced ribs and the inner wall of the extrusion cylinder is 0 mm to 0.3 mm.

[0026] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the extrusion screw according to Embodiment 1 of this utility model;

[0029] Figure 2 This is an exploded view of the extrusion screw according to Embodiment 1 of this utility model;

[0030] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle;

[0031] Figure 4 This is a schematic diagram of the juicer according to Embodiment 2 of this utility model;

[0032] Figure 5 This is an exploded view of the juicer according to Embodiment 2 of this utility model;

[0033] Figure 6 This is a cross-sectional schematic diagram of the extrusion assembly and the feeding assembly in Embodiment 2 of this utility model;

[0034] Figure 7 This is a cross-sectional schematic diagram of the extrusion screw and extrusion cylinder in Embodiment 2 of this utility model.

Detailed Implementation Methods

[0035] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0036] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Example 1:

[0040] like Figures 1 to 3 The image shows a segmented extrusion screw 300, mainly used in juicers to extrude fruits and vegetables. In this embodiment, the segmented extrusion screw 300 is primarily used in vertical juicers. Specifically, this embodiment includes: a screw body 30, which includes a feed end... Figure 1For example, the feed end is the top of the screw body 30, and fruits and vegetables mainly enter from the feed end and are gradually squeezed by the extrusion screw 300.

[0041] The outer periphery of the screw body 30 is provided with a spiral rib 31 for squeezing or crushing fruits and vegetables near the feed end. The spiral rib 31 forms the first extrusion section 300A. The first extrusion section 300A is a structure that most juicer extrusion screws 300 currently have. The spiral rib 31 is mainly used to squeeze the fruits and vegetables that have just entered. At the same time, the spiral design also plays a role in guiding the fruits and vegetables downwards step by step. In the juicer, the extrusion gap between the first extrusion section 300A and the inner wall of the extrusion cylinder 21 is relatively large, which helps large pieces of pulp to enter.

[0042] In order to make the fruit and vegetable fibers more thoroughly ground, in this embodiment, the extrusion screw 300 is also provided with a separate grinding section 300B below the first extrusion section 300A. After being extruded from the first extrusion section 300A, the fruits and vegetables enter the grinding section 300B. The main function of the grinding section 300B is to further grind the small particles of fruit pulp into a puree. This puree is closer to a fluid state, so as to facilitate subsequent pressing and filtration.

[0043] Regarding the specific structure of the grinding section 300B, as follows: Figure 1 or Figure 3 As shown, in this embodiment, the grinding section 300B includes at least one first tooth-shaped portion 33 disposed on the outer periphery of the screw body 30. In this embodiment, several first tooth-shaped portions 33 are evenly distributed in the circumferential direction, and the whole is similar to a toothed disc. This toothed disc grinding method can more thoroughly crush the pulp than the spiral ribs 31 in the first extrusion section 300A.

[0044] Furthermore, to further improve the grinding effect, the grinding section 300B in this embodiment includes an outwardly extending flange 34, which can be seen in [reference needed]. Figure 1 or Figure 2As shown, in this embodiment, the extrusion screw 300 is a tapered body with a gradually increasing outer diameter at the first extrusion section 300A. This is a commonly used design for extrusion screws 300, which allows the gap between the extrusion screw 300 and the inner wall of the extrusion cylinder 21 to gradually decrease, i.e., extrusion from large to small. In this embodiment, the grinding section 300B has a significant outward convexity in the radial direction, forming a step-like shape, and the first toothed portion 33 is provided on the outward flange 34. The advantages of this design are as follows: First, it can buffer the feeding process. At this stage, the fruit pulp has been basically broken into small particles, and some of it will fall rapidly with the fluid. The stepped outer flange 34 can effectively slow down the feeding speed, allowing this part of the fruit pulp to be fully ground in the grinding section 300B. Second, the grinding is more thorough. In the first extrusion section 300A, the fruit and vegetables are mostly subjected to lateral horizontal extrusion force, and there is a large extrusion space in the vertical direction. After being subjected to force, they may tend to be extruded downwards. However, when grinding is carried out on the outer flange 34, the fruit and vegetables are squeezed between the top of the outer flange 34 and the extrusion cylinder 21. The fruit and vegetables are mostly subjected to vertical extrusion force, and the lateral extrusion space is limited, which means that the fruit and vegetables can only be ground in this area. This grinding method greatly reduces the chance of fruit pulp being missed in grinding, making the grinding more thorough.

[0045] Furthermore, to improve the nutritional value of the extracted juice, the extrusion screw 300 in this embodiment also includes a second extrusion section 300C, which is located away from the feed end, and similarly... Figure 1 For example, the second extrusion section 300C is close to the bottom of the extrusion screw 300. The second extrusion section 300C includes at least one second rib 32 on the outer periphery of the screw body 30. The second rib 32 is provided with a guide surface 321 to guide the fruits and vegetables to be extruded in the radial direction. After the fruits and vegetables are crushed by the first extrusion section 300A, they enter the grinding section 300B for grinding. After grinding, they form a fruit puree and then enter the second extrusion section 300C. In the second extrusion section 300C, the fruits and vegetables are squeezed to the second filter screen 212 of the juicer under the guidance of the second rib 32 for scraping and grinding to form secondary filtration.

[0046] In this embodiment, the extrusion screw 300 is designed to be segmented. The first extrusion section 300A is mainly used to crush the large pieces of fruit pulp in the feed and further guide the pulp downwards. The juice extruded in the first extrusion section 300A is usually the most abundant. However, this part of the extrusion is mainly pure liquid because the fruit pulp has not been completely crushed at this stage. Most of the liquid in the fruits and vegetables is squeezed out.

[0047] As the fruit pulp passes through the first extrusion section 300A, large pieces of pulp are gradually cut and broken into small particles. These small particles contain a large amount of water-soluble fruit and vegetable fiber that is easily digested and absorbed by the human body. In this embodiment, the extrusion screw 300 is specially equipped with a separate second extrusion section 300C. This second extrusion section 300C has at least one second rib 32, and the second rib 32 has a guide surface 321 that guides the fruit and vegetables to be extruded radially. The remaining portion of the fruit pulp is contained within the second rib 32 in the second extrusion section 300C. Guided by the material, the juice is squeezed into the second filter 212 of the juicer for scraping. Unlike the first extrusion section 300A, which primarily guides the fruits and vegetables downwards during extrusion, the second extrusion section 300C mainly scrapes in a radial direction. During this scraping process, because the second rib 32 has a radially outward guiding surface 321, most of the liquid and water-soluble fruit and vegetable fibers are squeezed into the second filter 212 and seep out, thus forming secondary filtration. For the second extrusion section 300C, the fruits and vegetables need to be ground into a puree form for easier scraping. Therefore, the grinding section 300B in this embodiment can work well with the second extrusion section 300C to improve the extraction of nutrients from the juice and increase the juice yield.

[0048] Therefore, the extrusion screw 300 in this embodiment essentially realizes a three-stage juicing process, namely, from the initial crushing and extrusion, to the finer grinding and extrusion of small-particle fruit pulp, to the final scraping and grinding of fruit puree, all working together to increase the juice yield and nutritional value.

[0049] To ensure smooth material feeding into the second extrusion section 300C while simultaneously achieving effective grinding, the top surface of the outer flange 34 in this embodiment includes an inclined surface, with the first toothed portion 33 disposed on this inclined surface. This inclined surface design serves the purposes of buffering material feeding and ensuring more thorough grinding, as mentioned above, while also facilitating the smooth flow of the ground fruit puree into the lower second extrusion section 300C. Preferably, the inclination angle of the top surface of the outer flange 34 relative to the horizontal plane is between 3° and 45°. If the inclination angle is too small, it will hinder the feeding of the fruit puree; if the inclination angle is too large, the buffering effect will be affected. Typically, angles of 10°, 15°, and 20° are selected. It should be noted that designing the top surface of the outer flange 34 as an inclined surface is the preferred solution. In other embodiments, the top surface of the outer flange 34 can also be a plane, i.e., the material is pushed out using the guiding thrust of the first extrusion section 300A.

[0050] like Figure 1As shown, to ensure smooth feeding of the fruit puree into the second extrusion section 300C, the extrusion screw 300 in this embodiment has a flow channel between the grinding section 300B and the second extrusion section 300C for the fruit and vegetables to enter the second extrusion section 300C from the grinding section 300B. There are many possible designs for this flow channel. Taking this embodiment as an example, there are two types: the first channel is a notch 35 located at the top of the outer flange 34, extending to the side of the outer flange 34. This allows the fruit puree at the top of the outer flange 34 to enter the side of the outer flange 34 through the notch 35 and then into the second extrusion section 300C below. The second channel is located on the side of the outer flange 34, where several spacer ribs 36 are provided on the sidewall of the outer flange 34. Adjacent spacer ribs 36 form the second channel, allowing the fruit puree from the top of the outer flange 34 to enter the second extrusion section 300C through the second channel. Preferably, in this embodiment, the first and second channels are also interconnected.

[0051] Meanwhile, the spacer ribs 36 on the outer flange 34 also contribute to a more stable rotation of the extrusion screw. As is well known, the rotation of the extrusion screw 300 is driven by the central output shaft. Traditionally, a gap is left between the outer periphery of the extrusion screw and the extrusion cylinder to ensure the fruit and vegetables can be fed. This inevitably causes some shaking during operation. In this embodiment, since the grinding section mainly grinds at the top of the outer flange 34, and the fruit and vegetable flow channel is between two adjacent spacer ribs 36, the gap between the side spacer ribs 36 and the inner wall of the extrusion cylinder 21 can be relatively small. This is equivalent to providing outer ring positioning for the extrusion screw 300, resulting in better rotational stability. Especially in this embodiment, where the extrusion screw 300 uses a single bottom positioning and no top positioning, the shaking degree of this type of extrusion screw is greater than that of an extrusion screw with both top and bottom positioning. However, in this embodiment, the design of the spacer ribs 36 can alleviate the shaking problem of a single bottom-positioned extrusion screw to some extent.

[0052] To further leverage the role of the segmented extrusion screw 300 in each stage, in this embodiment, the grinding section 300B adopts a separate design from the screw body 30, such as... Figure 2As shown, a grinding sleeve 37 is fitted around the outside of the screw body 30, and a grinding section 300B is disposed on the grinding sleeve 37. The grinding sleeve 37 is a metal body. Currently, the screw body 30 is traditionally injection molded, while the grinding section 300B, due to the need for greater grinding strength, is made of a metal body with better hardness, such as an alloy material, which is more wear-resistant and has a better grinding effect. The assembly of the grinding sleeve 37 and the screw body 30 can be achieved by secondary injection molding or by manual assembly and fixation later. In this embodiment, secondary injection molding is preferred. It should be noted that, in order to make the fit between the grinding sleeve 37 and the screw body 30 more stable, the grinding sleeve 37 in this embodiment also includes part of the spiral ribs 31 of the first extrusion section 300A. This allows the contact area between the grinding sleeve 37 and the screw body 30 to be larger, reducing the probability of separation.

[0053] Meanwhile, in this embodiment, the second extrusion section 300C also adopts a separate design structure from the screw body 30. Since the second extrusion section 300C mainly performs scraping, the gap between the second rib 32 and the extrusion cylinder 21 needs to be relatively small, almost to achieve zero gap, or even an interference fit effect. Corresponding to this working environment, it is preferred that the second rib 32 has a certain elastic deformation capability, so as to reduce the problem of material jamming during the scraping process. Therefore, in this embodiment, it is preferable that the screw body 30 is fitted with an extrusion sleeve 38, and the second extrusion section 300C is located on the extrusion sleeve 38, so that the material of the extrusion sleeve 38 can be different from that of the screw body 30. In terms of specific materials, the extrusion sleeve 38 can be a soft body as a whole, that is, the second rib 32 and the extrusion sleeve 38 are made of a soft material. Of course, the body of the extrusion sleeve 38 can also be a hard body, and the second rib 32 can be designed as a soft body separately.

[0054] It should be noted that the grinding sleeve 37 and the extrusion sleeve 38 are merely preferred embodiments of this invention. In other embodiments, they are not limited to this split structure. Designing the grinding sleeve 37 and the extrusion sleeve 38 as integrally formed with the screw body 30 also falls within the protection scope of this utility model.

[0055] Regarding the specific structure of guide surface 321, as follows: Figure 3 As shown, in this embodiment, the guide surface 321 is an inclined surface or an arc surface, and the guide surface 321 is configured such that the distance between the guide surface 321 and the central axis gradually decreases along the rotation direction of the extrusion screw 300. Figure 3 For example, the arrow indicates the direction of rotation of the extrusion screw 300. Along this rotation direction, the guide surface 321 becomes increasingly closer to the circumferential side of the extrusion screw 300. When fruit and vegetable residue comes into contact with the guide surface 321, it will converge radially outward along the guide surface 321 and be extruded from the second filter screen 212.

[0056] For the layout or extension direction of the second rib 32, refer to the same. Figures 1 to 3 The second rib 32 is inclined to the outside of the screw body 30 relative to the axial direction. The axial direction referred to here is the axial direction of the rotation center axis of the extrusion screw 300. That is, the second rib 32 is not parallel to the axial direction. When viewed from the side, the second rib 32 intersects the center axis at an incline. The second rib 32 is designed in this way to reduce the resistance during the scraping process. At the same time, compared with the vertical design, this inclined design can prevent the fruit and vegetable residue from immediately sliding down to the slag discharge port 222, but adds a buffer function. This allows for a longer scraping time. In addition, it can also make the slag discharge smoother and prevent the residue from being too concentrated in one position.

[0057] It should be noted that in other embodiments, the second rib 32 is not limited to an inclined design; it can also be a vertical design.

[0058] To improve the slag removal effect, in this embodiment, the extrusion screw 300 also includes a slag removal rib 39 on the side of the second extrusion section 300C away from the feed end, and the residue generated in the second extrusion section 300C is guided out by the slag removal rib 39.

[0059] Example 2:

[0060] like Figures 4 to 7 The illustration shows a juicer, which includes a main body 100, a feeding assembly 400, and a pressing assembly 200. The main body 100 houses a driver, typically a motor and a reduction gear. The pressing assembly 200 includes a pressing cylinder 21 and a pressing screw 300 at least partially disposed within the pressing cylinder 21. The driver is kinetically connected to the pressing screw 300, causing the pressing screw 300 to rotate within the pressing cylinder 21. In this embodiment, the main body 100 is located at the bottom, the output shaft of the driver extends from the top of the main body 100, and the pressing assembly 200 is mounted on... At the top of the main body 100, the feeding component 400 is installed above the extrusion component 200. Fruits and vegetables are fed into the feeding component 400 and squeezed inside the extrusion component 200. The extrusion component 200 also includes an outer cylinder 22 located outside the extrusion cylinder 21. The outer cylinder 22 is provided with a juice outlet 221. A liquid channel is formed between the outer cylinder 22 and the extrusion cylinder 21. The juice squeezed out from the extrusion cylinder 21 flows out from the juice outlet 221 of the extrusion component 200, and the residue after extrusion is discharged from the residue discharge outlet 222 of the extrusion component 200. The basic principle of this juicer can be referred to the existing technology, and will not be elaborated here.

[0061] In this embodiment of the juicer, the extrusion screw 300 is the segmented extrusion screw 300 described in Embodiment 1. Within the extrusion assembly 200, the liquid and / or substances extruded from the fruits and vegetables through the first extrusion section 300A and the second extrusion section 300C are both connected to the juice outlet 221. The substances referred to here mainly refer to water-soluble fruit and vegetable fibers. The residue from the extrusion between the extrusion cylinder 21 and the second extrusion section 300C is discharged through the residue discharge port 222. A flexible baffle 2221 is located between the residue discharge port 222 and the extrusion cylinder 21.

[0062] like Figure 5 As shown, in this embodiment, the extrusion cylinder 21 is provided with a first filter screen 211 and a second filter screen 212. The first filter screen 211 corresponds to the first extrusion section 300A, and the second filter screen 212 corresponds to the second extrusion section 300C. That is, when the fruits and vegetables are extruded in the first extrusion section 300A, the liquid mainly flows into the juice outlet 221 through the first filter screen 211. When the fruits and vegetables are scraped in the second extrusion section 300C, the liquid and water-soluble fruit and vegetable fibers mainly flow into the juice outlet 221 through the second filter screen 212. In the design, since the fruits and vegetables are already close to a puree state in the second extrusion section 300C, in order to avoid larger residues also entering the juice outlet 221 through the second filter screen 212, the filter holes of the second filter screen 212 in this embodiment are smaller than or equal to the filter holes of the first filter screen 211. Both the first filter screen 211 and the second filter screen 212 are connected to the juice outlet 221.

[0063] Regarding the size parameters of the filter pores, the pore diameter of the first filter screen 211 ranges from 0.3mm to 2mm; preferably 1.2mm, 1.5mm, or 1.8mm. It should be noted that the first filter screen 211 is not limited to a single pore diameter, such as... Figure 5 As shown, the first filter screen 211 in this embodiment includes two types of filter screens with different diameters, namely the first upper filter screen 211a and the first lower filter screen 211b. This is mainly because the extrusion screw 300 is conical in the first extrusion section 300A, and its extrusion gap is progressive. Therefore, it can be used with filter screens of different diameters for filtration. For example, the diameter of the first lower filter screen 211b can even be the same as that of the second filter screen 212. However, even if the filter hole diameter is the same as that of the second filter screen 212, there is still a difference in the fitting gap. In the first extrusion section 300A, there is generally a large gap between the extrusion screw 300 and the first filter screen 211, rather than an almost zero gap fit like in the second extrusion section 300C. Otherwise, feeding would be very difficult.

[0064] In this embodiment, the filter pore diameter of the second filter screen 212 is in the range of 0.3mm-0.5mm. This pore diameter range is just right for fruit and vegetable fibers to pass through. If the pore diameter is too small, the fruit and vegetable fibers will not be able to pass through easily, while if the pore diameter is too large, some unnecessary residues will pass through. Usually, 0.3mm, 0.35mm, and 0.4mm are preferred.

[0065] As mentioned above, in this embodiment, the extrusion gap between the first extrusion section 300A and the first filter screen 211 is larger than the extrusion gap between the second extrusion section 300C and the second filter screen 212. The extrusion gap referred to here is mainly the lateral distance between the ribs and the filter screen. In the first extrusion section 300A, the main function is to crush and extrude the fruit and vegetables while guiding them downwards; therefore, the extrusion gap cannot be too small, otherwise it will hinder material feeding. In the second extrusion section 300C, which mainly contains small particles of fruit pulp or puree, the primary purpose is not feeding, but rather to fully filter out the nutrients from the small particles of fruit pulp or puree. Therefore, the extrusion gap between the second extrusion section 300C and the second filter screen 212 can be designed to be very small, almost zero gap, or even an interference fit. In actual design, the second rib 32 and the second filter screen 212 are in clearance fit, with a gap of less than or equal to 0.5 mm. The specific gap can be determined according to the elastic deformation capability of the second rib 32. If the elastic deformation capability is weak, the gap can be appropriately selected as 0.5 mm, 0.4 mm, etc. If the elastic deformation capability is strong, it can be 0 mm or 0.1 mm, etc. Of course, the second rib 32 and the second filter screen 212 can even be in interference fit.

[0066] Meanwhile, the fit between the second extrusion section 300C and the second filter 212 also helps to stabilize the rotation of the extrusion screw. The rotation of the extrusion screw 300 is driven by the central output shaft. Traditionally, there is a gap between the outer periphery of the extrusion screw and the extrusion cylinder to ensure that fruits and vegetables can be fed. This inevitably causes some shaking of the extrusion screw during operation. However, in this embodiment, the fit between the second extrusion section 300C and the second filter 212 is designed to be almost zero gap, or even an interference fit. This is equivalent to positioning the outer ring of the extrusion screw 300, resulting in better rotational stability. Especially in the juicer of this embodiment, the extrusion screw 300 is a single bottom-positioned extrusion screw without a top-positioned one. The shaking of this type of extrusion screw is greater than that of an extrusion screw with both top and bottom positioning. However, in this embodiment, the fit between the second extrusion section and the second filter 212 is used to alleviate the shaking problem of a single bottom-positioned extrusion screw to a certain extent.

[0067] In this embodiment, to cooperate with the grinding section 300B of the extrusion screw 300, the inner wall of the extrusion cylinder 21 is provided with a second toothed portion that matches the first toothed portion 33. The first toothed portion 33 and the second toothed portion cooperate with each other to make the grinding more thorough. At the same time, the gap between adjacent teeth can serve as a buffer to reduce the occurrence of material jamming. In addition, since the grinding section 300B of the extrusion screw 300 is specially designed with an outer flange 34, in this embodiment, the extrusion cylinder 21 is provided with an outer convex ring 214 corresponding to the outer flange 34. The second toothed portion is provided on the bottom wall of the outer convex ring 214. Therefore, during actual grinding, the fruits and vegetables are squeezed between the top of the outer flange 34 and the bottom wall of the outer convex ring 214. The extrusion force it bears is mainly in the vertical direction. Compared with lateral extrusion force, this grinding method is more thorough.

[0068] The compression gap between the first toothed portion 33 and the second toothed portion is preferably 0.1 mm to 0.5 mm. Here, the compression gap refers to the gap between the tooth tip of the first toothed portion 33 and the tooth tip of the second toothed portion. 0.1 mm or 0.2 mm are preferred.

[0069] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An extrusion screw, characterized in that, include: The screw body includes a feed end; The outer periphery of the screw body is provided with a spiral rib for extruding or crushing fruits and vegetables on the side near the feed end, and the spiral rib forms the first extrusion section; The extrusion screw also includes a separate grinding section. Fruits and vegetables are extruded from the first extrusion section and then enter the grinding section. The grinding section includes an outer flange extending radially outward and a grinding part disposed on the outer flange.

2. The extrusion screw as described in claim 1, characterized in that: The grinding section includes at least one first tooth-shaped portion disposed on the outer peripheral side of the screw body.

3. The extrusion screw as described in claim 2, characterized in that: The top surface of the outer flange includes an inclined surface, and the first tooth-shaped portion is disposed on the inclined surface.

4. The extrusion screw as described in claim 3, characterized in that: The inclined surface of the top surface of the outer flange has an angle of inclination between 3° and 45° relative to the horizontal plane.

5. The extrusion screw as described in claim 1, characterized in that: The extrusion screw has a flow channel on the grinding section for the continued flow of fruits and vegetables.

6. The extrusion screw as described in claim 5, characterized in that: The flow channel includes a first channel, the first channel including a notch at the top of the outer flange, the notch extending to the sidewall of the outer flange; and / or, the flow channel includes at least two spaced ribs on the sidewall of the outer flange, with a second flow channel formed between adjacent spaced ribs.

7. The extrusion screw as described in claim 1, characterized in that: The grinding section is integral with the screw body; or, the screw body is fitted with a grinding sleeve, the grinding sleeve includes the grinding section, and the grinding sleeve is a metal body.

8. A juicer, comprising a main body, a feeding assembly, and a pressing assembly, wherein a driver is provided in the main body, and the pressing assembly includes a pressing cylinder and a pressing screw at least partially disposed within the pressing cylinder, the driver being pulsatorically connected to the pressing screw to cause the pressing screw to rotate within the pressing cylinder, characterized in that: The extrusion screw is the extrusion screw according to any one of claims 1 to 7.

9. A juicer as described in claim 8, characterized in that: The grinding section includes at least one first tooth-shaped portion disposed on the outer periphery of the screw body, and the inner wall of the extrusion cylinder is provided with a second tooth-shaped portion that matches the first tooth-shaped portion.

10. A juicer as described in claim 8, characterized in that: The grinding section includes an outer flange formed by the radial outward extension of the screw body, the first toothed portion is provided on the outer flange, and the extrusion cylinder is provided with an outer convex ring corresponding to the outer flange.

11. A juicer as described in claim 10, characterized in that: The top surface of the outer flange includes an inclined surface, the first toothed portion is disposed on the inclined surface, and the inner wall of the outer ring is provided with a second toothed portion corresponding to the position of the first toothed portion.

12. A juicer as described in claim 11, characterized in that: The compression gap between the first toothed portion and the second toothed portion is 0.1 mm to 0.5 mm.

13. A juicer as described in claim 8, characterized in that: The outer flange sidewall is provided with at least two spacer ribs, and a second flow channel is formed between adjacent spacer ribs. The gap between the spacer ribs and the inner wall of the extrusion cylinder is 0mm to 0.3mm.

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