A grinder for preparing salted yolk powder

Abstract

The utility model provides a kind of grinder of salty egg yolk powder preparation belongs to grinder technical field, the grinder of salty egg yolk powder preparation includes: vertical hollow shell;It is located in the shell inside, and upper shear cavity and lower grinding cavity are arranged along longitudinal direction interval;A pair of horizontal arrangement sawtooth cutter head is equipped in upper shear cavity, the pair of sawtooth cutter head is installed on the transverse eccentricity adjusting support of upper shear cavity in rotatable manner, and movable positioning eccentricity adjusting component is equipped between eccentricity adjusting support and shell side wall;A pair of horizontal arrangement smooth surface grinding disc is equipped in lower grinding cavity;Between upper shear cavity and lower grinding cavity, there is the grate board of overturning, one end of grate board is hinged to shell inner wall, the other end extends shell and is fixedly connected with push rod, and push rod drives grate board to overturn between closed position and discharge position;Shell top is equipped with the feed hopper being connected with upper shear cavity, solve the problem that traditional salty egg yolk powder preparation transfer temperature rises, granularity is not adjustable and easily overgrind leads to oil exosmosis.

Description

Technical Field

[0001] This utility model belongs to the field of grinding technology, and more specifically, relates to a grinding tool for preparing salted egg yolk powder. Background Technology

[0002] In the field of deep processing of snack foods, salted egg yolk flavor is highly favored by consumers for its rich salty and savory taste and "sandy" texture. To stably add this flavor to products such as potato chips and biscuits, the baked salted egg yolks must first be processed into a fine powder with uniform particle size and no oil leakage. Existing technologies generally adopt a two-stage equipment of "crushing first and then grinding": the first stage uses high-speed blades or hammers to coarsely crush the salted egg yolk pieces, and the second stage uses roller mills, ball mills, or vibratory mills to further refine them. The entire process requires material transfer between two machines, which not only occupies a large area, but also makes it easy for oil leakage and flavor volatilization to occur due to temperature rise and ambient humidity during transfer and temporary storage. Ultimately, the powder will have problems such as clumping, dark color, and greasy taste. In addition, traditional grinders generally use grinding discs with fixed gaps, which cannot flexibly adjust the shearing or grinding intensity according to batch differences, resulting in some batches being over-ground and some batches having residual coarse particles; the screen or grate plate needs to be stopped and disassembled when discharging material, which further aggravates heat accumulation. For food factories that require continuous and clean production, the aforementioned drawbacks directly increase energy consumption, labor and cleaning costs, and also limit the large-scale promotion of innovative salted egg yolk flavored products. Utility Model Content

[0003] In view of this, the present invention provides a grinder for preparing salted egg yolk powder, which solves the problems of high transfer temperature, unadjustable particle size, and easy over-grinding leading to oil seepage in traditional salted egg yolk powder preparation, and realizes continuous two-stage crushing and grinding with stepless gap adjustment in a single machine.

[0004] This utility model is implemented as follows: This utility model provides a grinder for preparing salted egg yolk powder, comprising: Vertical hollow shell; The upper shearing chamber and the lower grinding chamber are located inside the outer shell and are arranged longitudinally at intervals. The upper shearing cavity is equipped with a pair of horizontally arranged saw blades. The pair of saw blades are mounted on the transverse eccentric adjustment bracket of the upper shearing cavity in a rotatable manner. An eccentric adjustment component that can be moved and positioned is provided between the eccentric adjustment bracket and the side wall of the outer shell. The lower grinding chamber is equipped with a pair of horizontally arranged smooth grinding discs. The pair of smooth grinding discs are installed on the centering support of the lower grinding chamber in a way that they rotate in opposite directions at the same speed. A replaceable set of wedge-shaped shims is sandwiched between the centering support and the outer shell to steplessly adjust the gap between the grinding discs. A flip-up grate is provided between the upper shearing chamber and the lower grinding chamber. One end of the grate is pivotally connected to the inner wall of the outer shell, and the other end extends out of the outer shell and is fixedly connected to the lever. The lever drives the grate to flip between the closed position and the discharge position. The top of the outer shell is provided with a feed hopper that communicates with the upper shearing chamber, and the bottom of the outer shell is provided with a discharge port that communicates with the lower grinding chamber.

[0005] The grate plate is an arc-shaped perforated plate. At its upstream end (the end closer to the feeding direction), a pair of horizontal short shafts extend coaxially from both sides of the plate edge. These short shafts are rotatably embedded through corresponding shaft holes on the side wall of the outer casing, forming a pivot fulcrum. At the downstream end of the grate plate (the end closer to the discharge direction), the central plate edge is bent downward to form a rigid lug with a transverse through hole. The lever is a rod with one end bent into a hook shape and the other end being a handle. Its hook-shaped end passes through the arc-shaped guide groove on the side wall of the outer casing and is inserted into the transverse through hole of the lug. It is fixed by a pin or rivet, so that the lever and the grate plate form a fixed connection that cannot be rotated relative to each other. When the lever slides along the arc-shaped guide groove, it drives the grate plate to rotate around the pivot fulcrum.

[0006] By using an upper shearing chamber and a lower grinding chamber arranged vertically and longitudinally within the outer shell, coarse cutting and fine grinding are integrated into the same enclosed space. The center distance of the cutter discs is adjustable using an eccentric adjustment bracket, and the grinding disc gap is infinitely adjustable using a set of wedge-shaped shims. Furthermore, the chamber connection state can be switched instantaneously by a flip-up grate. This allows for continuous two-stage processing of "first shearing and crushing, then fine grinding and refining" after a single loading. This significantly shortens the process flow and avoids secondary pollution and grease leakage caused by traditional separate equipment. As a result, the salted egg yolk powder retains its "sandy" granular texture while achieving a uniform and delicate quality.

[0007] Based on the above technical solution, the grinder for preparing salted egg yolk powder of this utility model can be further improved as follows: The eccentric adjustment bracket is a frame-shaped bracket with its two sides slidably embedded in the horizontal grooves on the outer shell wall. The eccentric adjustment component is an adjustment screw that penetrates the side wall of the outer shell and is threadedly engaged with the frame-shaped bracket. The rotation of the adjustment screw drives the frame-shaped bracket to reciprocate within the horizontal grooves to change the center distance of the cutter head.

[0008] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the eccentric adjustment mechanism composed of the frame bracket, the horizontal slide, and the adjusting screw can make the bracket move as a whole by rotating the screw, thereby steplessly changing the center distance of the cutter head. No parts need to be disassembled during the operation. The adjustment accuracy is high and the positioning is reliable. It can quickly adapt to the hardness difference of different batches of baked salted egg yolks, ensuring that the shearing force is always in the optimal range, extending the life of the cutter head and reducing energy consumption.

[0009] Furthermore, the outer periphery of the serrated cutter disc is provided with an annular flange, and a labyrinthine sealing gap is formed between the annular flange and the top wall of the upper shearing cavity to prevent salted egg yolk fragments from escaping.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the annular flange on the outer periphery of the sawtooth cutter head forms a labyrinth-like sealing gap with the top wall of the upper shearing chamber, which can effectively prevent salted egg yolk fragments from splashing outward during high-speed shearing, keep the inside of the shell and the surrounding environment clean, reduce the frequency of cleaning, and prevent small particles from entering the bearings or drive mechanism, thereby reducing the failure rate.

[0011] Furthermore, the outer edge of the smooth grinding disc is provided with a radially outwardly extending annular baffle, and a tortuous backflow powder channel is formed between the annular baffle and the inner wall of the lower grinding chamber, which is used to prolong the powder residence time and improve the grinding uniformity.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the tortuous reflux channel formed by the annular retaining edge of the outer edge of the smooth grinding disc and the inner wall of the lower grinding chamber allows the powder to circulate and reflux multiple times under the action of centrifugal force, extending the effective grinding path, thereby improving the grinding uniformity without increasing the rotation speed, reducing the temperature rise, preventing the oil from seeping out due to overheating, and further ensuring the flavor and taste of the salted egg yolk powder.

[0013] Furthermore, the wedge-shaped gasket assembly is composed of multiple interchangeable wedge-shaped gaskets stacked together. Each wedge-shaped gasket is pressed between the centering support and the outer shell by fastening bolts that penetrate the outer shell wall, so as to realize stepless adjustment of the grinding disc gap.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: multiple interchangeable wedge-shaped gaskets are stacked and tightened at one time with fastening bolts, which not only realizes the stepless adjustment of the grinding disc gap, but also allows for quick replacement when the gaskets are worn or the particle size needs to be changed. The three-step operation of "loosening-adding-locking" can be completed on site without special measuring tools, reducing maintenance time to a few minutes and significantly improving equipment utilization.

[0015] Furthermore, the grate is an arc-shaped perforated plate, and its pivot end is hinged to the inner wall of the outer casing through a horizontal rotating shaft. The lever extends through the arc-shaped guide groove on the side wall of the outer casing and can slide along the guide groove, thereby driving the grate to flip between the closed position and the discharge position.

[0016] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the perforated grate plate with arc-shaped cross section is hinged to the outer shell through a horizontal rotating shaft, and the grate plate can be driven to flip by sliding the lever along the arc-shaped guide groove. The entire mechanism has no springs or complex connecting rods, the structure is simple and reliable, the flipping angle is visible and can be stopped, and instantaneous discharge can be achieved without stopping the machine, avoiding powder over-grinding and agglomeration, while facilitating manual observation of the working condition inside the cavity.

[0017] Furthermore, the bottom of the arc-shaped guide groove is provided with multiple positioning recesses that can engage with the lever, for locking the grate plate at any flip angle.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: After the multiple positioning recesses at the bottom of the arc-shaped guide groove are engaged with the lever, the grate can be locked at any required angle to achieve various discharge rates such as half-open, fully open or slightly open, to meet the different material flow requirements of subsequent processes, improve the flexibility of the entire line, and prevent the grate from accidentally returning to its original position due to vibration.

[0019] Furthermore, the top feed hopper of the outer shell is funnel-shaped, and its inner wall is provided with downwardly inclined guide vanes. A spiral descending channel is formed between the guide vanes and the feed hopper wall to guide the salted egg yolk pieces into the upper shearing chamber evenly.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the inclined guide vanes on the inner wall of the funnel-shaped feed hopper form a spiral descent channel, which allows the salted egg yolk pieces to slide down evenly along the tangential direction, avoiding one-time accumulation that could cause the cutter head to jam. At the same time, the spiral flow can pre-loosen agglomerated materials, improve shearing efficiency, reduce instantaneous load impact, and extend the life of drive components.

[0021] Furthermore, the bottom outlet of the outer shell is inverted conical, and its inner wall is provided with spirally rising guide ribs. A spirally rising airflow channel is formed between the guide ribs and the outlet wall to assist in the discharge of powder and reduce residue.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral rising guide ribs on the inner wall of the inverted cone-shaped discharge port form a local upward airflow during discharge, which not only guides the powder to slide smoothly down but also carries away residual heat and moisture, significantly reducing sticking to the wall and residue, resulting in clean and thorough discharge without the need for manual knocking and cleaning, and maintaining the consistency of flavor between batches.

[0023] Furthermore, the middle side wall of the outer casing is provided with a detachable inspection window, which is sealed to the outer casing by a quick-release latch, for quick cleaning or replacement of the grate and wedge gasket assembly.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the detachable maintenance window in the middle of the outer shell is sealed and fixed by a quick-release latch. The operator only needs to move the latch with one hand to open the window and directly observe or clean the grate, wedge gasket assembly and grinding disc surface. The entire maintenance process does not require tools, the downtime is shortened, the intensity of manual maintenance is effectively reduced and the continuous operation capability of the equipment is improved.

[0025] Compared with existing technologies, the beneficial effects of the grinder for preparing salted egg yolk powder provided by this utility model are as follows: The dual-cavity differential shear grinder proposed by this utility model integrates the two-stage functions of "coarse cutting and fine grinding" in the same sealed shell. After the salted egg yolk pieces fall from the feed hopper, they are first rapidly sheared by the differential sawtooth cutter disc in the upper shearing chamber. The particle size is adjusted steplessly in real time by the eccentric adjustment bracket, which avoids instantaneous overload and completes the initial crushing before the oil film is broken in large quantities. Then, the particles fall into the lower grinding chamber by their own weight through the flip-over grate. The smooth grinding disc gently grinds the particles in the same speed and in the opposite direction. The gap is infinitely finely adjusted by the wedge-shaped gasket group, which not only ensures that the powder is fine and uniform, but also significantly suppresses the temperature rise due to the low shearing speed and short residence time, and the oil is not easy to seep out. The tilting discharge mechanism, consisting of a grate and a lever, allows the chambers to be instantly connected or isolated without stopping the machine, preventing over-grinding and facilitating batch switching. The synergistic design of the labyrinth seal, annular baffle, and inverted conical discharge port maintains a slight negative pressure inside the equipment even at high speeds, preventing dust escape and powder residue, thus ensuring both a clean workshop environment and optimal product flavor. The inspection window and quick-release latches allow for inspection or replacement of the wedge-shaped gaskets, grate, and grinding disc within minutes, significantly reducing downtime for cleaning. Overall, this grinder, while reducing footprint and energy consumption, significantly improves the consistency of taste and flavor retention of salted egg yolk powder, providing an efficient, clean, and flexible upstream raw material preparation solution for industries such as potato chips and baking, and offering a feasible path for the modern deep processing of traditional salted egg yolk ingredients. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 Example diagram of a grinder for preparing a salted egg yolk powder; Figure 2 A top view of a grinder used to prepare salted egg yolk powder; Figure 3 A top-side view of a grinder for preparing salted egg yolk powder; The attached diagram lists the components represented by each number as follows: 10. Outer shell; 11. Lever; 12. Feed hopper; 13. Discharge port; 20. Upper shearing chamber; 21. Serrated cutter head; 22. Eccentric adjustment bracket; 30. Lower grinding chamber; 31. Polished grinding disc; 32. Wedge-shaped gasket set; 40. Grate plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0029] like Figures 1-3 The image shown is an example diagram of a grinder for preparing salted egg yolk powder provided by this utility model, comprising: Vertical hollow shell 10; The upper shearing cavity 20 and the lower grinding cavity 30 are located inside the outer casing 10 and are arranged longitudinally at intervals. The upper shearing cavity 20 is provided with a pair of horizontally arranged saw blade discs 21. The pair of saw blade discs 21 are mounted on the transverse eccentric adjustment bracket 22 of the upper shearing cavity 20 in a rotatable manner. An eccentric adjustment component that can be moved and positioned is provided between the eccentric adjustment bracket 22 and the side wall of the outer shell 10. The lower grinding chamber 30 is provided with a pair of horizontally arranged smooth grinding discs 31. The pair of smooth grinding discs 31 are installed on the centering support of the lower grinding chamber 30 in a manner that rotates in opposite directions at the same speed. A replaceable wedge-shaped gasket set 32 ​​is sandwiched between the centering support and the outer shell 10 to steplessly adjust the gap between the grinding discs. A flip-up grate 40 is provided between the upper shearing chamber 20 and the lower grinding chamber 30. One end of the grate 40 is pivotally connected to the inner wall of the outer shell 10, and the other end extends out of the outer shell 10 and is fixedly connected to the lever 11. The lever 11 drives the grate 40 to flip between the closed position and the discharge position. The top of the outer casing 10 is provided with a feed hopper that communicates with the upper shearing chamber 20, and the bottom of the outer casing 10 is provided with a discharge port 13 that communicates with the lower grinding chamber 30.

[0030] Specific operating steps: First, pour the roasted salted egg yolk cubes into the feed hopper, and under the guidance of the guide vanes, they will evenly enter the upper shearing chamber; start the drive to make the serrated cutter disc rotate at a differential speed, and adjust the center distance of the cutter discs by adjusting the screw to complete the coarse cutting; the coarse particles fall into the lower grinding chamber through the grate, and the smooth grinding disc rotates in the opposite direction at the same speed, and the grinding disc gap is adjusted by adding or removing wedge shims for fine grinding; when the powder reaches the required fineness, move the lever to flip the grate to the discharge position, and the powder will be quickly discharged through the spiral discharge port; after stopping the machine, open the inspection window to quickly clean or replace parts, and the whole process is continuous and efficient.

[0031] In the above technical solution, the eccentric adjustment bracket 22 is a frame bracket, which is slidably embedded in the horizontal groove of the outer shell wall on both sides. The eccentric adjustment component is an adjustment screw that penetrates the side wall of the outer shell and is threadedly engaged with the frame bracket. The rotation of the adjustment screw drives the frame bracket to move back and forth in the horizontal groove to change the center distance of the cutter head.

[0032] Furthermore, in the above technical solution, the outer periphery of the serrated cutter disc 21 is provided with an annular flange, and a labyrinth-like sealing gap is formed between the annular flange and the top wall of the upper shearing cavity 20 to prevent salted egg yolk fragments from escaping.

[0033] Furthermore, in the above technical solution, the outer edge of the smooth grinding disc 31 is provided with a radially outwardly extending annular baffle, and a tortuous backflow powder channel is formed between the annular baffle and the inner wall of the lower grinding chamber 30, which is used to prolong the powder residence time and improve the grinding uniformity.

[0034] Furthermore, in the above technical solution, the wedge gasket group 32 is composed of multiple interchangeable wedge gaskets stacked together. Each wedge gasket is pressed between the centering support and the outer shell 10 by fastening bolts that penetrate the wall of the outer shell 10, so as to realize stepless adjustment of the grinding disc gap.

[0035] Furthermore, in the above technical solution, the grate plate 40 is an arc-shaped perforated plate, and its pivot end is hinged to the inner wall of the outer shell 10 through a horizontal rotating shaft. The lever 11 extends through the arc-shaped guide groove on the side wall of the outer shell 10 and can slide along the guide groove, thereby driving the grate plate 40 to flip between the closed position and the discharge position.

[0036] Furthermore, in the above technical solution, the bottom of the arc-shaped guide groove is provided with multiple positioning notches that can engage with the lever 11, for locking the grate plate 40 at any flip angle.

[0037] Furthermore, in the above technical solution, the top feed hopper of the outer shell 10 is funnel-shaped, and its inner wall is provided with downwardly inclined guide vanes. A spiral descending channel is formed between the guide vanes and the feed hopper wall to guide the salted egg yolk pieces into the upper shearing cavity 20 evenly.

[0038] Furthermore, in the above technical solution, the bottom outlet 13 of the outer shell 10 is an inverted cone shape, and its inner wall is provided with spirally rising guide ribs. A spirally rising airflow channel is formed between the guide ribs and the wall of the outlet 13, which is used to assist the powder discharge and reduce residue.

[0039] Furthermore, in the above technical solution, the middle side wall of the outer casing 10 is provided with a detachable maintenance window. The maintenance window is sealed to the outer casing 10 by a quick-release latch, and is used for quick cleaning or replacement of the grate plate 40 and the wedge gasket assembly 32.

[0040] First Embodiment: This embodiment is designed for small to medium-sized food factories producing 3-5 tons of salted egg yolk powder per day, with a workshop area of ​​approximately 150 square meters. The equipment must be able to be pushed into the existing mezzanine platform without requiring an additional foundation. The outer shell adopts a vertical cylindrical stainless steel welded structure, 1100 mm high and 500 mm in outer diameter. The upper shearing chamber and lower grinding chamber are integrally formed by a coaxial partition. A rectangular discharge port, 300 mm long and 100 mm wide, is opened in the center of the partition, and an arc-shaped grate is installed at the discharge port. The pivot end of the grate uses a short shaft with a diameter of 12 mm to mate with the shaft hole of the outer shell, and the other end is welded with a lug with a through hole. The lever is a 10 mm diameter stainless steel round bar that passes through the arc-shaped guide groove on the side wall of the outer shell, inserts into the lug, and is fixed with a cotter pin. The guide groove is 90 degrees in angle, and three positioning recesses are stamped at the bottom of the groove to facilitate locking the grate at three angles: horizontal, 45 degrees, or vertical, achieving continuous discharge or complete closure.

[0041] The upper shearing chamber houses a pair of 200mm diameter saw blades, each mounted on a rolling bearing seat of an eccentric frame bracket. Horizontal grooves, 100mm long, are embedded in the outer wall of the bracket on both sides. Threaded sleeves are welded to the outer side of the bracket, and an adjusting screw passes through the side wall of the outer shell and engages with the threaded sleeves. A handwheel is fitted to the head of the screw; rotating the handwheel allows for stepless adjustment of the center distance between the two blades within a range of 0 to 10mm. A 3mm thick annular flange is provided around the outer circumference of the blades, maintaining a 0.5mm labyrinth gap with the top wall of the upper chamber to prevent debris from entering the bearings.

[0042] The lower grinding chamber is equipped with a pair of 250 mm diameter smooth grinding discs made of food-grade white cast iron with a surface hardness of HRC55. The lower grinding discs are fixed on a centering support, and three interchangeable stainless steel wedge-shaped shims are placed between the bottom surface of the support and the bottom plate of the outer shell. The shims have a 1:20 angle and are locked with three M12 bolts. Loosening the bolts allows the shims to be removed or inserted, enabling stepless adjustment of the grinding disc gap from 0.1 to 1.0 mm. The outer edge of the lower grinding disc is machined with a 10 mm high and 5 mm thick annular retaining edge, forming a return channel with the cavity wall. Three spiral guide ribs are welded to the inner wall of the inverted conical discharge port. The guide ribs are 8 mm high and have a lead of 120 mm. The lower end of the discharge port is connected to a quick-release clamp-type hose, which can be directly connected to a vacuum feeder.

[0043] A 300mm wide and 200mm high inspection window is located in the middle of the outer casing. A silicone sealing strip is used between the window frame and the casing. The quick-release latch is an eccentric cam structure, which can be opened or locked by rotating 90 degrees. In operation, workers first pour the roasted salted egg yolk cubes into the feed hopper, where they are evenly fed into the upper shearing chamber under the guidance of the guide vanes. The center distance of the cutter discs is adjusted by handwheel, and the motor is started, causing the cutter discs to rotate differentially to complete the coarse crushing. Then, the lever is rotated to flip the grate 45 degrees, and the coarse particles fall into the lower grinding chamber, where they are ground into powder by the smooth grinding disc. Once the powder particle size is within acceptable limits, the lever is rotated to the vertical position, and the powder is instantly discharged. Throughout the process, the temperature rise does not exceed 40 degrees Celsius, grease leakage is minimal, and the average particle size of the powder remains stable within the target range. The equipment can perform rapid cleaning between shifts without disassembling any parts, meeting the flexible production needs of small to medium capacity and frequent batch changes.

[0044] Second Embodiment: This embodiment serves a large-scale OEM factory, processing 20 tons of salted egg yolk cubes daily, requiring 24-hour continuous operation. The equipment is located on a two-story steel structure platform. The outer shell adopts a rectangular welded box structure, 1300 mm high, 800 mm long, and 600 mm wide. A double-feed hopper is installed at the top to accommodate simultaneous feeding from two front-end baking lines. Internal partitions divide the outer shell into two symmetrical upper shearing chambers and lower grinding chambers, sharing a central discharge channel. A single, tiltable grate is installed within the discharge channel; the grate's pivot end uses a through-shaft, with both ends extending out of the outer shell and connected to an external handwheel via a coupling. Rotating the handwheel synchronously tilts the left and right grates, achieving dual-chamber coordinated discharge.

[0045] Each shearing chamber contains a 300mm diameter saw blade disc, centrally mounted on an eccentric frame bracket. The bracket slides against the outer casing via two parallel guide rails. The eccentric adjustment mechanism has been replaced with a worm gear pair, with a servo handwheel mounted on the worm shaft end, allowing for fine-tuning of the cutter disc center distance during operation to accommodate conditions with large fluctuations in the hardness of incoming materials. A 4mm thick, wavy labyrinth ring is added to the outer edge of the cutter disc, forming multiple oil return grooves with the cavity wall to further reduce the risk of oil leakage.

[0046] The polished grinding disc in the lower grinding chamber has a diameter of 350 mm and a tungsten carbide-coated surface with a hardness of HRC65. Five layers of wedge-shaped gaskets of different thicknesses are placed between the centering support and the outer shell. The gaskets use a quick-change insert-type structure, which can be pulled out or inserted by loosening the outer handle, allowing for fine adjustment of the grinding disc gap from 0.05 to 1.2 mm. The annular retaining edge of the outer edge of the grinding disc is 15 mm high, forming a two-stage reflux channel with the chamber wall to enhance powder uniformity. Four variable-pitch spiral guide ribs are welded inside the inverted conical discharge port. The lower end of the guide ribs is connected to a pneumatic butterfly valve, which can be seamlessly connected to the central negative pressure conveying system.

[0047] Two inspection windows are provided at the front and rear of the outer casing. The windows adopt a hinged upward-opening structure, and the window frames are inlaid with EPDM foam sealing strips. They are locked with a three-point quick clamp. The window area is 350 mm x 250 mm. Workers can open the windows without stopping the machine to quickly replace wedge gaskets or clean the grate. In the second embodiment, two grinding units are arranged in parallel and discharged uniformly through a central material discharge channel. This not only meets the needs of large production capacity, but also facilitates centralized powder collection and dust removal. The worm gear fine-tuning mechanism can respond to the differences in incoming materials in real time during operation, ensuring stable powder particle size under 24-hour continuous operation. The amount of oil leakage is lower than the company's internal control standard, which significantly reduces the frequency of manual intervention and is suitable for large-scale, low-variety, long-cycle stable production scenarios.

[0048] Specifically, the principle of this invention is as follows: This invention uses continuous physical field control—differential shearing—uniform speed grinding—instantaneous discharge—as its core concept. The serrated cutter disc in the upper shearing chamber adopts an eccentric adjustable structure. By changing the center distance of the cutter discs, a periodically changing shear gap can be formed in the plane of rotation. This causes the salted egg yolk pieces to be subjected to a triple action of stretching, tearing, and compression at the moment of cutting, resulting in high crushing efficiency and low temperature rise. The differential speed operation of the cutter discs further generates a sliding velocity gradient between the tooth surfaces, effectively preventing the grease film from rupturing due to localized high temperatures. After the coarsely crushed particles enter the lower grinding chamber through the grate, the smooth grinding discs rotate in opposite directions at the same speed. The particles are subjected to uniform positive pressure and shear force within the gap between the grinding discs, gradually reducing the particle size. The wedge-shaped gasket assembly allows the gap to be infinitely varied within the micrometer scale, thus achieving "flexible grinding" of salted egg yolks with different moisture contents and baking hardness. This avoids excessive shearing that leads to grease leakage while ensuring the "sandy" texture of the finished powder. The grate tilting mechanism utilizes the lever principle to amplify the small-angle swing of the external lever into a large-angle tilt of the grate, achieving instantaneous opening and closing of the chamber. During the tilting process, the axis of the grate channel coincides with the discharge port of the grinding disc, allowing the powder to be rapidly discharged under the combined action of gravity and centrifugal force, preventing stagnation. A labyrinth seal, annular baffles, and spiral guide ribs together construct a multi-stage reflux and micro-negative pressure channel, cooling the powder while preventing the escape of oil vapors. The quick-release latch of the inspection window utilizes a cam-pressing principle, enabling one-handed operation and instant sealing, ensuring long-term stable operation of the equipment under food-grade hygienic conditions. The entire system requires no intelligent electronic components; it achieves unified particle size control, temperature control, discharge control, and cleaning control solely through the ingenious coupling of mechanical structures, demonstrating the significant advantages of continuous mechanical processing in flavor preservation and energy consumption control.

Claims

1. A grinder for preparing salted egg yolk powder, characterized in that, include: Vertical hollow shell; The upper shearing chamber and the lower grinding chamber are located inside the outer shell and are arranged longitudinally at intervals. The upper shearing cavity is equipped with a pair of horizontally arranged saw blades. The pair of saw blades are mounted on the transverse eccentric adjustment bracket of the upper shearing cavity in a rotatable manner. An eccentric adjustment component that can be moved and positioned is provided between the eccentric adjustment bracket and the side wall of the outer shell. The lower grinding chamber is equipped with a pair of horizontally arranged smooth grinding discs. The pair of smooth grinding discs are installed on the centering support of the lower grinding chamber in a way that they rotate in opposite directions at the same speed. A replaceable set of wedge-shaped shims is sandwiched between the centering support and the outer shell to steplessly adjust the gap between the grinding discs. A flip-up grate is provided between the upper shearing chamber and the lower grinding chamber. One end of the grate is pivotally connected to the inner wall of the outer shell, and the other end extends out of the outer shell and is fixedly connected to the lever. The lever drives the grate to flip between the closed position and the discharge position. The top of the outer shell is provided with a feed hopper that communicates with the upper shearing chamber, and the bottom of the outer shell is provided with a discharge port that communicates with the lower grinding chamber.

2. The grinder for preparing salted egg yolk powder according to claim 1, characterized in that, The eccentric adjustment bracket is a frame-shaped bracket with its two sides slidably embedded in the horizontal grooves on the outer shell wall. The eccentric adjustment component is an adjustment screw that penetrates the side wall of the outer shell and is threadedly engaged with the frame-shaped bracket. The rotation of the adjustment screw drives the frame-shaped bracket to reciprocate within the horizontal groove to change the center distance of the cutter head.

3. The grinder for preparing salted egg yolk powder according to claim 2, characterized in that, The outer periphery of the serrated cutter disc is provided with an annular flange, and a labyrinthine sealing gap is formed between the annular flange and the top wall of the upper shearing cavity to prevent salted egg yolk fragments from escaping.

4. The grinder for preparing salted egg yolk powder according to claim 3, characterized in that, The outer edge of the smooth grinding disc is provided with a radially outwardly extending annular baffle. The annular baffle and the inner wall of the lower grinding chamber form a tortuous backflow powder channel, which is used to prolong the powder residence time and improve the grinding uniformity.

5. The grinder for preparing salted egg yolk powder according to claim 4, characterized in that, The wedge-shaped gasket assembly is composed of multiple interchangeable wedge-shaped gaskets stacked together. Each wedge-shaped gasket is pressed between the centering support and the outer shell by fastening bolts that penetrate the outer shell wall, so as to realize stepless adjustment of the grinding disc gap.

6. The grinder for preparing salted egg yolk powder according to claim 5, characterized in that, The grate is an arc-shaped perforated plate, and its pivot end is hinged to the inner wall of the outer shell through a horizontal rotating shaft. The lever extends through the arc-shaped guide groove on the side wall of the outer shell and can slide along the guide groove, thereby driving the grate to flip between the closed position and the discharge position.

7. The grinder for preparing salted egg yolk powder according to claim 6, characterized in that, The bottom of the arc-shaped guide groove is provided with multiple positioning notches that can engage with the lever, which are used to lock the grate at any flip angle.

8. The grinder for preparing salted egg yolk powder according to claim 7, characterized in that, The top feed hopper of the outer shell is funnel-shaped, and its inner wall is provided with downwardly inclined guide vanes. The guide vanes and the feed hopper wall form a spiral descending channel to guide the salted egg yolk pieces into the upper shearing chamber evenly.

9. The grinder for preparing salted egg yolk powder according to claim 8, characterized in that, The bottom outlet of the outer shell is inverted cone-shaped, and its inner wall is provided with spirally rising guide ribs. The guide ribs and the outlet wall form a spirally rising airflow channel to assist the powder discharge and reduce residue.

10. The grinder for preparing salted egg yolk powder according to claim 9, characterized in that, The middle side wall of the outer casing is provided with a detachable maintenance window, which is sealed to the outer casing by a quick-release latch, for quick cleaning or replacement of the grate and wedge gasket assembly.

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