Peeled jujube powder crushing device as well as preparation method and application thereof

Abstract

The invention discloses a peeled jujube powder crushing device and a preparation method and application thereof.The peeled jujube powder crushing device comprises a barrel and a crushing assembly, the barrel is internally provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the bottom of the first cavity is coaxially communicated with an annular collecting cavity, and the bottom of the second cavity is coaxially communicated with the annular collecting cavity; the collecting cavity is coaxially arranged on the periphery of the second cavity in a surrounding mode, the collecting cavity and the second cavity are separated through an annular partition plate, a feeding port is formed in the top of the barrel, a jujube pulp powder discharging port is formed in the bottom of the collecting cavity, and a jujube peel powder discharging port is formed in the bottom of the second cavity; the crushing assembly comprises a rotating shaft coaxially arranged in the cylinder, the bottom of the rotating shaft is rotationally connected with the bottom wall of the second cavity, the top of the rotating shaft rotationally penetrates out of the cylinder and is connected with a motor, and two crushing blades are arranged on the periphery of the rotating shaft. The red date peeling machine can crush red dates, realizes direct peeling of the red dates by separating the red date powder from the red date peel powder, and is high in working efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of red date crushing, and more specifically, to a device for crushing peeled red date powder, and a preparation method and application thereof. Background Art

[0002] Jujube powder contains a variety of bioactive substances, such as jujube polysaccharides, saponins, flavonoids, triterpenes, alkaloids, guanosine cyclic phosphate, cyclic adenosine phosphate, etc., which have a variety of health care and disease treatment effects on the human body. Jujube powder can be widely used in the production of instant noodle seasoning, fruit powder granules, baked goods, ice cream, popsicles, fruit juices, jellies, milk drinks and various pharmaceutical health foods. In the production and processing of jujube powder, it is necessary to peel and de-core the original jujube and then crush it. For example, the invention patent application with application publication number CN110089660A discloses a jujube peeling process and a method for preparing superfine jujube powder, which does not cause the loss of nutrients and flavor substances, reduces the cumbersome degree of the process flow, and ensures the cleanliness of the peeling. However, the peeling process still affects the crushing efficiency, and there is room for improvement. Summary of the invention

[0003] An object of the present invention is to provide a peeled jujube powder crushing device and a preparation method and application thereof, which does not require peeling of red dates, and can achieve peeling of red dates by separating jujube fruit powder and jujube peel powder, and has good crushing effect and high work efficiency.

[0004] In order to achieve these purposes and other advantages of the present invention, according to one aspect of the present invention, the present invention provides a peeled jujube powder crushing device, comprising: The cylinder has a first cavity and a second cavity connected to each other from top to bottom, the bottom of the first cavity is coaxially connected to an annular collecting cavity, the collecting cavity is coaxially arranged around the outer periphery of the second cavity, and the two are separated by an annular partition, the top of the cylinder is provided with a feed inlet, the bottom of the collecting cavity is provided with a jujube meat powder discharge port, and the bottom of the second cavity is provided with a jujube peel powder discharge port; A crushing assembly includes a rotating shaft coaxially arranged in the cylinder, the bottom of the rotating shaft is rotatably connected to the bottom wall of the second cavity, the top of the rotating shaft rotates through the cylinder and is connected to a motor, two crushing blades are arranged on the outer periphery of the rotating shaft and accommodated in the second cavity, the two crushing blades are both V-shaped structures, and the two crushing blades are arranged in a centrally symmetrical manner, and the feed port is close to the rotating shaft.

[0005] Preferably, the diameter of the first cavity is greater than the diameter of the second cavity, and the outer diameter of the collecting cavity is consistent with the diameter of the first cavity, so that the side walls of the first cavity and the collecting cavity are flush.

[0006] Preferably, two scraping components are oppositely arranged on the outer periphery of the rotating shaft. Each scraping component includes a jujube flesh powder scraper, a connecting plate, and a jujube skin powder scraper that are connected in sequence. The jujube flesh powder scraper is in a U-shaped structure and is provided with a first scraper A, a first scraper B, and a first scraper C that are vertically connected in sequence. The connecting plate and the jujube skin powder scraper are both in an L-shaped structure. The connecting plate includes a connecting plate a and a connecting plate b that are vertically connected. The jujube skin powder scraper includes a second scraper A and a second scraper B that are vertically connected. Among them, the first scraper C is vertically connected to the connecting plate a, the connecting plate b is vertically connected to the second scraper A, the first scraper B is close to the side walls of the first cavity and the collection cavity, the first scraper C is close to the bottom wall of the collection cavity, the second scraper A is close to the side wall of the second cavity, the second scraper B is close to the bottom wall of the second cavity, and bristles are provided on the first scraper B, the first scraper C, the second scraper A, and the second scraper B.

[0007] Preferably, a sleeve is coaxially rotatably sleeved on the outer periphery of the rotating shaft. The bottom of the rotating shaft extends beyond the bottom of the sleeve. Two crushing blades are fixedly connected to the rotating shaft. The first scraper A of the two scraping components is vertically and fixedly connected to the sleeve.

[0008] Preferably, the top of the cylinder body is connected to a housing through a plurality of support rods. The motor is installed in the housing. The sleeve rotates out of the cylinder body and rotates into the housing. The top of the rotating shaft extends beyond the top of the sleeve and is coaxially fixedly sleeved with a first worm part. A rotating rod A and a rotating rod B are also installed in the housing. Both ends of the rotating rod A and the rotating rod B are rotatably connected to the inner wall of the housing. The rotating rod A, the rotating rod B, and the rotating shaft are all perpendicular to each other. A first worm gear and a second worm part are coaxially fixedly sleeved on the outer periphery of the rotating rod A. A second worm gear and a third worm part are coaxially fixedly sleeved on the outer periphery of the rotating rod B. A third worm gear is coaxially fixedly sleeved on the outer periphery of the sleeve. Among them, the first worm part meshes and rotates with the first worm gear, the second worm part and the second worm gear, and the third worm part and the third worm gear. The thread pitches of the first worm part, the second worm part, and the third worm part gradually decrease.

[0009] Preferably, the cylinder body is a double-wall structure. A cooling liquid is filled in the gap between the double walls. The cylinder body is provided with a liquid inlet and a liquid outlet that communicate with the gap.

[0010] Preferably, it further includes: An air jetting component, including a plurality of first-stage air jet nozzles arranged at the first cavity near the feed port, a plurality of second-stage air jet nozzles arranged at the bottom of the second cavity, and a plurality of third-stage air jet nozzles respectively arranged at the collection cavity near the jujube flesh powder discharge port and the second cavity near the jujube skin powder discharge port, and obliquely downward towards the discharge port. Each air nozzle is connected to the gas storage tank through a metal elbow, each metal elbow is installed with a rotary ball valve, and the gas storage tank is equipped with a manual pressure pump and a pressure gauge.

[0011] Preferably, each first-stage air nozzle is set to have an air jet pressure of 0.3-0.5MPa, each second-stage air nozzle is set to have an air jet pressure of 0.2-0.3MPa, and each third-stage air nozzle is set to have an air jet pressure of 0.1-0.2MPa.

[0012] Preferably, there are four first-stage air nozzles, which are arranged in a circular array on the inner wall of the first cavity near the feed port, the angle between adjacent first-stage air nozzles is 90°, and the whole is cylindrical, with a contracted air nozzle at the front end, each first-stage air nozzle is fixed to a mounting hole opened on the inner wall of the first cavity by welding, and the air inlet at the rear end of the first-stage air nozzle is threadedly connected to the metal elbow; There are 6 second-stage air nozzles, which are arranged in a circular array at the bottom of the second cavity. The angle between adjacent second-stage air nozzles is 60°. The whole is L-shaped, the bending radius at the right-angle bend is 20mm, and the front end is a contracted air nozzle. The vertical part of the second-stage air nozzle is fixed to the mounting hole opened on the bottom of the second cavity by welding, and the air inlet of the second-stage air nozzle is threadedly connected to the metal elbow. The third-stage air nozzle is provided with two air nozzles in a relative manner near the jujube pulp powder discharge port in the collecting chamber, and two air nozzles are provided in a relative manner near the jujube peel powder discharge port in the second chamber. The whole is in the shape of a curved tube with a bending angle of 45°, obliquely downward toward the discharge port. The third-stage air nozzle is fixed to the mounting hole opened on the side wall of the corresponding discharge port by welding, and the air inlet of the third-stage air nozzle is threadedly connected to the metal curved tube; The bending radius of the bending part of the metal bent pipe is not less than 3 times of the pipe diameter, and the multiple metal bent pipes are connected to the gas storage tank by flanges; The diameter of the rotary ball valve is consistent with the diameter of the metal elbow, the valve stem of the ball valve extends out of the ball valve housing, and a rotary handle with a scale mark is installed at the end of the valve stem. The rotation angle range of the handle is 0-90°, corresponding to the closed and fully open states of the valve; The design pressure of the gas tank is 1MPa, and the working pressure is controlled between 0.5-0.8MPa. A manual pressure pump, a pressure gauge and a safety valve are arranged on the top of the gas tank. The maximum output pressure of the manual pressure pump is not less than 1.2MPa. The manual pressure pump is connected to the gas tank through a high-pressure oil pipe. The pressure resistance value of the high-pressure oil pipe is not less than 1.5MPa. The range of the pressure gauge is 0-1MPa. A spring-loaded safety valve is installed on the interface of the safety valve, and the opening pressure is set to 0.85MPa. When the pressure in the gas tank exceeds the set value, the safety valve automatically opens to release the pressure.

[0013] The present invention also provides a method for preparing peeled jujube powder, comprising the following steps: Step 1: select high-quality red dates and soak them in a soaking solution for 30 to 60 minutes, wherein the soaking solution includes 0.8 to 1.2% sodium alginate, 0.1 to 0.3% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step 3: Use the peeled jujube powder crushing device to feed the freeze-dried red dates from the feed port, and at the same time open the rotary ball valve corresponding to the first-stage air nozzle 601, release the high-pressure gas from the gas tank 700, transport it through the metal elbow 703 and spray it out from the first-stage air nozzle, so that the jujube fruits are evenly distributed and fall into the second cavity, start the motor to drive the rotating shaft to drive the crushing blades to rotate, crush the freeze-dried red dates, and at the same time open the rotary ball valve 704 corresponding to the second-stage air nozzle 603, release the high-pressure gas from the gas tank 700, and pass through the metal elbow 703 to crush the freeze-dried red dates. The jujube pulp and the jujube peel powder are transported through the tube 703 and ejected through the second-stage air nozzle 603 to promote the separation of the jujube flesh and the jujube peel, and the jujube pulp powder scraper and the jujube peel powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity. After the crushing is completed, the motor is turned off and the rotary ball valve 704 corresponding to the third-stage air nozzle 602 is opened. The high-pressure gas is released from the gas storage tank 700, transported through the metal elbow 703 and ejected through the third-stage air nozzle 602, the jujube peel powder is collected from the jujube peel powder discharge port, and the jujube pulp powder is collected from the jujube pulp powder discharge port to obtain peeled jujube powder.

[0014] The invention also provides peeled jujube powder prepared by the preparation method.

[0015] The present invention also provides an application of the peeled jujube powder in preparing the red jujube composite meal replacement powder.

[0016] The present invention has at least the following beneficial effects: First, the present invention utilizes a unique crushing blade to crush the red dates that have only been de-cored but not peeled to produce ultrafine powder. During the crushing process, the gas in the second cavity is stirred by the crushing blade, so that a pressure difference is generated around the powder particles, thereby generating a floating force. Since the texture of the jujube flesh is relatively soft, it is easier to be crushed into fine particles during the crushing process, and it is easier to move in the material system, showing relatively good fluidity, making it easier for them to move upward and enter the first cavity. However, the texture of the jujube peel is tough, and the crushed particles are relatively large and compact, with poor mobility. At the same time, the presence of the annular partition limits the movement path of the jujube peel powder to a certain extent, making it more difficult for the jujube peel powder to enter the first cavity, so that it remains in the second cavity, so that the purpose of directly separating the jujube fruit and the jujube peel can be achieved during the crushing process, and the separation effect is good; the side walls of the first cavity and the second cavity are scraped and swept by the scraping component, and then collected by the jujube flesh powder outlet and the jujube peel powder outlet, with high work efficiency.

[0017] Second, the present invention soaks and freeze-dries the red dates before crushing them. The sodium alginate in the soaking solution is a hydrophilic high molecular polysaccharide with a large number of carboxyl groups (-COOH) on the molecular chain. There are many tiny pores and channels on the surface and inside of the jujube peel. The sodium alginate molecules can swell in the aqueous solution and gradually diffuse into these pores by virtue of their hydrophilicity. At the same time, the carboxyl groups can undergo ion exchange reactions with some metal ions (such as calcium ions, etc.) in the jujube peel to form a cross-linked structure, so that the sodium alginate is firmly bound to the jujube peel. Citric acid is an organic acid with three carboxyl groups, which can react with alkaline substances (such as certain proteins, alkaloids, etc.) in the jujube peel. Moreover, its carboxyl groups can also form stable complexes with metal ions in the jujube peel. These reactions enable citric acid to penetrate deeply into the jujube peel and tightly bind to the jujube peel. After sodium alginate and citric acid are combined with the jujube peel, the adhesion between the jujube peel and the jujube meat is reduced, making it easier for the two to separate during the crushing process, and the separation effect is good.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a peeled jujube powder crushing device in a technical solution of the present invention; Figure 2 It is a structural schematic diagram of the cylinder described in a technical solution of the present invention; Figure 3 It is a structural schematic diagram of the scraping and sweeping assembly described in a technical solution of the present invention; Figure 4This is a schematic diagram of the structure inside the housing in a technical solution of the present invention; Figure 5 A schematic diagram of the structure of the jet assembly in a technical solution of the present invention; Figure 6 A schematic structural diagram of the air jet of any second-stage air jet in a technical solution of the present invention; Figure 7 A schematic structural diagram of a gas storage tank in a technical solution of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0021] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0022] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 of the present invention.

[0023] like Figures 1 to 4 As shown, the present invention provides a peeled jujube powder crushing device, comprising: The cylinder 100 has a first cavity 101 and a second cavity 102 which are connected to each other from top to bottom. The bottom of the first cavity 101 is coaxially connected to an annular collecting cavity 103. The collecting cavity 103 is coaxially arranged around the outer periphery of the second cavity 102. The two are separated by an annular partition 104. The top of the cylinder 100 is provided with a feed inlet 105. The bottom of the collecting cavity 103 is provided with a jujube meat powder discharge port 106. The bottom of the second cavity 102 is provided with a jujube peel powder discharge port 107. A crushing assembly includes a rotating shaft 200 coaxially arranged in the cylinder 100, the bottom of the rotating shaft 200 is rotatably connected to the bottom wall of the second cavity 102, the top of the rotating shaft 200 rotates through the cylinder 100 and is connected to a motor 201, and two crushing blades 202 are arranged on the periphery of the rotating shaft 200 and accommodated in the second cavity 102, both of which are V-shaped structures, and the two crushing blades 202 are arranged in a centrally symmetrical manner, and the feed port 105 is close to the rotating shaft 200.

[0024] The peeled jujube powder crushing device in the above technical solution includes a cylinder 100 and a crushing assembly. The cylinder 100 is divided into two upper and lower interconnected first cavities 101 and second cavities 102. An annular collecting chamber 103 is arranged at the bottom of the first cavity 101. The collecting chamber 103 coaxially surrounds the periphery of the second cavity 102. The collecting chamber 103 and the second cavity 102 are separated by an annular partition 104. A feed inlet 105 is arranged at the top of the cylinder 100. A jujube meat powder discharge port 106 is arranged at the bottom of the collecting chamber 103. A jujube peel powder discharge port 107 is arranged at the bottom of the second cavity 102. A rotating shaft 200 is arranged in the cylinder 100. The bottom of the rotating shaft 200 is rotatably connected to the bottom wall of the second cavity 102. The top of the rotating shaft 200 rotates out of the cylinder 100 through a sealed bearing and is connected to a motor 201. Two crushing blades 202 are arranged on the outer periphery of the rotating shaft 200 . Both crushing blades 202 are designed in a V-shaped structure, and the two crushing blades 202 are arranged on the rotating shaft 200 in a centrally symmetrical manner. During use, the pitted red dates are freeze-dried, and when the moisture content is less than 5%, the raw materials are fed through the feed port 105 and fall into the second cavity 102, the motor 201 is turned on to drive the rotating shaft 200 to drive the two crushing blades 202 to rotate, and the red dates are crushed into ultrafine powder, wherein the lighter jujube powder floats due to the stirring of the airflow, and then is concentrated on the side wall of the first cavity 101 due to the centrifugal force, and the heavier jujube peel powder is located below the jujube meat powder, and is blocked by the annular partition 104 and retained on the side wall of the second cavity 102, so as to realize the direct separation of jujube fruit and jujube peel, and the jujube powder falls into the collection cavity 103 and is collected by the jujube meat powder discharge port 106, and the jujube peel powder is collected by the jujube peel powder discharge port 107, so as to realize the peeling and crushing process. The setting of the annular partition 104 described in the technical solution not only ensures the reasonable flow direction of the jujube fruit powder and the jujube peel powder, but also avoids the confusion of the jujube fruit powder and the jujube peel powder. The crushing blade 202 with a unique shape design not only increases the contact area with the red dates material, ensuring the uniformity and efficiency of the mixing process, but also realizes the effective cutting of the red dates material, so that the red dates are crushed into ultrafine powder, and the date fruit and the date peel can be directly separated while crushing, with a good separation effect.

[0025] In another technical solution, the diameter of the first cavity 101 is greater than the diameter of the second cavity 102, and the outer diameter of the collecting cavity 103 is consistent with the diameter of the first cavity 101, so that the side walls of the first cavity 101 and the collecting cavity 103 are flush. In this technical solution, the side wall of the collecting cavity 103 is flush with the side wall of the first cavity 101, which facilitates the smooth fall of the jujube powder into the collecting cavity 103 and facilitates collection.

[0026] In another technical solution, two scraping and sweeping components are relatively arranged on the periphery of the rotating shaft 200, each scraping and sweeping component includes a jujube meat powder scraper, a connecting plate and a jujube peel powder scraper connected in sequence, the jujube meat powder scraper is a U-shaped structure, and is provided with a first scraper A300, a first scraper B301 and a first scraper C302 connected vertically in sequence, the connecting plate and the jujube peel powder scraper are both L-shaped structures, the connecting plate includes a vertically connected connecting plate a303 and a connecting plate b304, the jujube peel powder scraper includes a vertically connected second scraper A305 and a second scraper B306, wherein the The first scraper C302 is vertically connected to the connecting plate a303, the connecting plate b304 is vertically connected to the second scraper A305, the first scraper B301 is close to the side walls of the first cavity 101 and the collecting cavity 103, the first scraper C302 is close to the bottom wall of the collecting cavity 103, the second scraper A305 is close to the side wall of the second cavity 102, the second scraper B306 is close to the bottom wall of the second cavity 102, and the first scraper B301, the first scraper C302, the second scraper A305 and the second scraper B306 are all provided with bristles. In this technical solution, due to the action of centrifugal force, the jujube pulp powder and jujube peel powder after being crushed and separated are mostly on the side walls of the first cavity 101 and the second cavity 102. If it is time-consuming and laborious to collect manually, two scraping and sweeping components are designed to automatically scrape and collect them. The first scraper B301 is used to scrape the side walls of the first cavity 101 and the collecting cavity 103, so that the jujube powder can be scraped into the collecting cavity 103, and then the first scraper C302 is used to scrape the bottom wall of the collecting cavity 103, so that the jujube powder is discharged through the jujube powder discharge port 106 for automatic collection, and the second scraper A305 is used to scrape the side walls of the second cavity 102, and the second scraper B306 is used to scrape the bottom wall of the second cavity 102, so that the jujube peel powder is discharged through the jujube peel powder discharge port 107 for automatic collection, thereby improving the convenience of use.

[0027] In another technical solution, the outer periphery of the rotating shaft 200 is coaxially sleeved with a sleeve 203, the bottom of the rotating shaft 200 exceeds the bottom of the sleeve 203, two crushing blades 202 are fixedly connected to the rotating shaft 200, and the first scrapers A300 of the two scraping and sweeping assemblies are vertically fixedly connected to the sleeve 203. In this technical solution, the outer periphery of the upper half of the rotating shaft 200 is coaxially sleeved with a sleeve 203 through a bearing, and the sleeve 203 can rotate freely on the outer periphery of the rotating shaft 200, both sets of scraping and sweeping assemblies are connected to the sleeve 203, and the two crushing blades 202 are connected to the rotating shaft 200, so that the scraping and sweeping assemblies and the crushing blades 202 can rotate independently.

[0028] In another technical solution, the top of the cylinder 100 is connected to a shell 400 through a plurality of support rods 401, the motor 201 is installed in the shell 400, the sleeve 203 rotates out of the cylinder 100 and rotates into the shell 400, the top of the rotating shaft 200 exceeds the top of the sleeve 203 and is coaxially fixedly sleeved with a first worm part 402, and a rotating rod A403 and a rotating rod B404 are also installed in the shell 400, and both ends of the rotating rod A403 and the rotating rod B404 are rotatably connected to the inner wall of the shell 400, and the rotating rod A403 and the rotating rod B404 are rotatably connected to the inner wall of the shell 400. , the shafts 200 are perpendicular to each other, the outer periphery of the rotating rod A 403 is coaxially fixedly sleeved with the first worm gear 405 and the second worm part 406, the outer periphery of the rotating rod B 404 is coaxially fixedly sleeved with the second worm gear 407 and the third worm part 408, and the outer periphery of the sleeve 203 is coaxially fixedly sleeved with the third worm gear 409, wherein the first worm part 402 is meshed and rotated with the first worm gear 405, the second worm part 406, the second worm gear 407, the third worm part 408 and the third worm gear 409, and the thread pitch of the first worm part 402, the second worm part 406 and the third worm part 408 is gradually reduced. In this technical solution, the top of the cylinder 100 is connected to the housing 400 through a plurality of sturdy and durable support rods 401, and the housing 400 provides a stable installation platform for the motor 201. The sleeve 203 rotates freely to pass through the barrel 100, and rotates smoothly to pass into the shell 400, ensuring seamless transmission of power. The top of the rotating shaft 200 exceeds the top of the sleeve 203, and the first worm part 402 is coaxially fixedly arranged on the exceeding part. In the shell 400, a rotating rod A403 and a rotating rod B404 are also installed. The two ends of the two rotating rods are rotatably connected to the inner wall of the shell 400 through bearings to ensure its stability and reliability during the transmission process. The rotating rod A403 and the rotating rod B404 and the rotating shaft 200 are perpendicular to each other. On the periphery of the rotating rod A403, a first worm wheel 405 and a second worm part 406 are coaxially fixedly arranged, and the second worm wheel 407 and the third worm part 408 are fixedly sleeved on the periphery of the rotating rod B404. The design of these worm wheels and worm parts not only takes into account the accuracy and efficiency of transmission, but also fully considers the meshing effect and wear resistance between them. The outer periphery of the sleeve 203 is also coaxially fixedly sleeved with the third worm gear 409. In this complex transmission system, the first worm part 402 and the first worm gear 405, the second worm part 406 and the second worm gear 407, and the third worm part 408 and the third worm gear 409 all achieve precise meshing rotation, ensuring the stability and reliability of the transmission.The thread pitches of the first worm portion 402, the second worm portion 406 and the third worm portion 408 are cleverly designed to decrease gradually, thereby gradually reducing the rotation speeds of the first worm gear 405, the second worm gear 407 and the third worm gear 409, and further reducing the rotation speeds of the sleeve 203 together with the two scraping and sweeping components, so that the rotation speeds of the two scraping and sweeping components meet the scraping and sweeping requirements, thereby avoiding the problem of powder flying due to excessive rotation speed.

[0029] In another technical solution, the cylinder 100 is a double-wall structure, the cavity 108 between the double walls is filled with cooling liquid, and the cylinder 100 is provided with a liquid inlet 109 and a liquid outlet 110 connected to the cavity 108. In this technical solution, the cavity 108 is filled with cooling liquid to keep the interior of the cylinder 100 at a relatively low temperature to prevent the jujube powder from agglomerating due to high temperature. The liquid inlet 109 and the liquid outlet 110 are provided to facilitate the introduction or discharge of cooling liquid into the cavity 108, and the cavity 108 is connected to a circulating pump and a refrigerator to improve the cooling effect.

[0030] In another technical solution, as shown in FIG5 , an air jet assembly is also provided, including a first-stage air jet nozzle 601 provided at the first cavity near the feed port, a second-stage air jet nozzle 603 provided at the bottom of the second cavity, and a third-stage air jet nozzle 602 provided at the collecting cavity near the jujube pulp powder discharge port and the second cavity near the jujube peel powder discharge port, and obliquely downward toward the discharge port. As shown in FIG7 , each air jet nozzle is connected to the gas storage tank 700 through a metal elbow, and a rotary ball valve 704 is installed on each metal elbow 703. The gas storage tank 700 is made of high-strength carbon steel and is equipped with a manual pressure pump 702 and a pressure gauge 701. The operator controls the air jet of each air jet nozzle through the rotary ball valve 704, and uses the manual pressure pump 702 to adjust the air pressure of the gas storage tank 700. The manual pressure pump can be an AULLTE brand ADLL702 manual hydraulic pump. In this technical solution, a plurality of first-stage air jet nozzles 601 are provided at a position near the feed port of the first cavity. The main function of the air jet is to break up the freeze-dried red dates with a high-speed airflow, so as to assist the date fruits to be evenly distributed after entering the first cavity, and to prevent the date fruits from piling up or getting stuck in the cavity, thereby affecting the subsequent crushing and separation effect. A plurality of second-stage air jets 603 are arranged at the bottom of the second cavity. The main function of the air jet is to promote the further separation of the date flesh and the date peel, and to assist the date flesh powder to move to the collection cavity. Since the second cavity is the key area for separating the date flesh from the date peel, the design of the second-stage air jet 603 can ensure that the date flesh powder can be smoothly separated from the date peel and enter the collection cavity along the set path. At the positions near the date flesh powder discharge port in the collection cavity and the date peel powder discharge port in the second cavity, the third-stage air jet 602 obliquely downwardly facing the discharge port is respectively arranged. The main function of these air jets is to accelerate the discharge of the date flesh powder and the date peel powder, and to prevent the powder from piling up or getting stuck near the discharge port, so as to ensure that the powder can be discharged smoothly from the discharge port. The working principle of the air jet assembly is mainly based on the jet effect of high-pressure gas. The high-pressure gas in the gas tank 700 is transported to each gas nozzle through the metal elbow 703, and the operator controls the gas injection state of each gas nozzle through the rotary ball valve 704. When gas injection is required, the operator opens the corresponding rotary ball valve 704, and the high-pressure gas is released from the gas tank 700, transported to the gas nozzle through the metal elbow 703, and finally ejected at a certain speed and direction. During the gas injection process, the injection of high-pressure gas not only helps to evenly distribute the jujube fruits, separate the jujube pulp from the jujube skin, and discharge the powder smoothly, but also reduces the dust and residue inside the equipment to a certain extent, and improves the cleanliness and service life of the equipment.

[0031] In another technical solution, the first section of the air nozzle 601 is set to a jet pressure of 0.3-0.5MPa, which is used to break up the freeze-dried red dates with a high-speed airflow, the second section of the air nozzle 603 is set to a jet pressure of 0.2-0.3MPa, which is used to strengthen the separation of the jujube meat and the jujube skin, and the third section of the air nozzle 602 is set to a jet pressure of 0.1-0.2MPa, which is used to assist the discharge of the jujube meat and the jujube skin. In this technical solution, the first section of the air nozzle 601 is set to a jet pressure in the range of 0.3 to 0.5MPa. It is intended to use high-speed airflow to effectively break up the freeze-dried red dates entering the device. When the red dates enter the first cavity, the first section of the air nozzle 601 will impact the red dates with a strong airflow, so that it is quickly dispersed and evenly falls into the subsequent crushing area. Such a setting not only improves the crushing efficiency of the red dates, but also helps to reduce the accumulation and blockage of the red dates in the cavity, thereby improving the overall production efficiency. The second section of the air nozzle 603 is set to a jet pressure between 0.2 and 0.3MPa. The air jets at this stage are mainly used to strengthen the separation process of jujube meat and jujube peel. In the second cavity, after the red dates are initially crushed, the jujube meat and jujube peel begin to gradually separate. At this time, the second-stage air jet 603 will further impact and disturb the red dates with a moderate airflow, making the connection between the jujube meat and the jujube peel looser, thereby accelerating their separation. This design not only improves the separation efficiency of the jujube meat and the jujube peel, but also helps to reduce residues and improve the quality of the product. The third-stage air jet 602 is set to a jet pressure in the range of 0.1 to 0.2 MPa. The air jets at this stage are mainly used to assist the discharge process of the jujube meat and the jujube peel. At the position of the collecting chamber and the second cavity near the discharge port, the third-stage air jet 602 will guide the jujube meat powder and the jujube peel powder with a soft airflow to help them discharge the equipment smoothly. This setting not only ensures the stability of the discharge, but also helps to reduce the accumulation and blockage of powder near the discharge port, thereby further improving production efficiency. Through the precise setting of the jet pressure of each section of the jet nozzle and the reasonable design of the jet direction, the red dates can be efficiently broken up, the jujube flesh and the jujube skin can be separated, and the powder can be discharged in an auxiliary manner during the processing of the jujube powder.

[0032] In another technical solution, there are four first-stage air nozzles 601, which are arranged in a circular array on the inner wall of the first cavity near the feed port. The angle between adjacent first-stage air nozzles 601 is 90°. They are made of stainless steel and are cylindrical in shape. The front end is a contracted air nozzle. The first-stage air nozzle 601 is fixed to the mounting hole on the inner wall of the first cavity by welding. The air inlet of the first-stage air nozzle 601 is threadedly connected to the metal elbow. like Figure 6As shown, there are 6 second-stage air nozzles 603 arranged in a circular array at the bottom of the second cavity. The angle between adjacent second-stage air nozzles 603 is 60°. They are made of stainless steel and are L-shaped as a whole. The bending radius at the right-angle bend is 20mm. The front end is a contracted air nozzle. The vertical part of the second-stage air nozzle 603 is fixed to the mounting hole opened on the bottom of the second cavity by welding. The air inlet of the second-stage air nozzle 603 is threadedly connected to the metal elbow. Figure 6 In the example, the jet outlet of one of the second-stage jet nozzles is marked as 6031.

[0033] The third-stage air nozzle 602: two are arranged opposite to each other in the collecting chamber near the outlet of the jujube pulp powder, and two are arranged opposite to each other in the second chamber near the outlet of the jujube peel powder. The third-stage air nozzle 602 is made of stainless steel and is in the shape of a curved tube with a bending angle of 45°, obliquely downward toward the outlet. The third-stage air nozzle 602 is fixed to the mounting hole on the side wall of the corresponding outlet by welding, and the air inlet of the third-stage air nozzle is threadedly connected to the metal curved tube; Metal elbow 703: Use seamless steel pipe made of 304 stainless steel. The diameter of the air outlet is compatible with the inner diameter of each section of the air nozzle. The bending radius of the metal elbow is not less than 3 times the diameter of the pipe. The connection of the metal elbow gas tank adopts flange connection. Rotary ball valve 704: copper ball valve is used. The diameter of the ball valve is consistent with the diameter of the metal elbow. The valve stem of the ball valve extends out of the ball valve housing. A rotating handle with a scale mark is installed at the end of the valve stem. The rotation angle range of the handle is 0-90°, corresponding to the closed and fully open states of the valve; Gas tank 700: The main body is made of high-strength carbon steel, with a design pressure of 1MPa and a working pressure controlled between 0.5-0.8MPa. A manual pressure pump, pressure gauge and safety valve are installed on the top of the gas tank. The manual pressure pump uses a plunger-type manual pressure pump made of aluminum alloy. The maximum output pressure of the pressure pump is not less than 1.2MPa. The pressure pump is connected to the gas tank through a high-pressure oil pipe, and the pressure resistance of the high-pressure oil pipe is not less than 1.5MPa. The pressure gauge range is 0-1MPa. A spring-loaded safety valve is installed on the safety valve interface, and the opening pressure is set to 0.85MPa. When the pressure in the gas tank exceeds the set value, the safety valve automatically opens to release the pressure.

[0034] In the above technical solution, four mounting holes are drilled on the inner wall of the first cavity near the feed port according to the preset position and angle (90° interval). The air nozzles are inserted into the corresponding mounting holes one by one, ensuring that the front end of the air nozzle is contracted and faces the inside of the cavity. The air nozzle is made of stainless steel and is cylindrical in shape, which is corrosion-resistant and wear-resistant. The air nozzle is welded and fixed to the inner wall of the cavity to ensure a firm connection and good sealing. Use welding equipment to thread one end of the metal elbow to the air inlet of the air nozzle to ensure a tight connection without leakage. The metal elbow is made of stainless steel, which has high strength and corrosion resistance.

[0035] At the bottom of the second cavity, six mounting holes are drilled according to the preset positions and angles (60° intervals). Insert the air nozzles into the corresponding mounting holes one by one, and ensure that their right-angled bends face the appropriate direction. The air nozzle is also made of stainless steel and is L-shaped as a whole. The bending radius at the right-angle bend is moderate to reduce the loss of airflow at the bend. Use welding equipment to weld and fix the air nozzle to the bottom of the cavity. Connect the other end of the metal elbow to the air inlet of the air nozzle through threads.

[0036] Drill two mounting holes at the collecting chamber near the outlet of the jujube pulp powder and at the second chamber near the outlet of the jujube peel powder. Insert the air nozzles into the corresponding mounting holes one by one, and ensure that the air nozzles are tilted downward toward the outlet. The air nozzles are designed in the shape of a stainless steel elbow with a moderate bending angle to enhance the guiding effect of the airflow. Use welding equipment to weld and fix the air nozzles to the side wall of the chamber. Connect the metal elbow to the air inlet of the air nozzle through threads.

[0037] Connect the other end of the metal elbow to the air inlet of the rotary ball valve through a flange. Flange connection has the advantages of simple structure and good sealing. The rotary ball valve is made of copper material, which has corrosion resistance and good sealing performance. The diameter of the ball valve matches the diameter of the metal elbow to ensure smooth transmission of the airflow. A rotating handle with a scale mark is installed at the end of the valve stem of the ball valve to facilitate operation and control of the opening and closing of the airflow.

[0038] The gas tank is made of high-strength carbon steel with a design pressure of 1MPa and a working pressure controlled between 0.5-0.8MPa. A manual pressure pump, a pressure gauge, a safety valve and other accessories are installed on the top of the gas tank. The manual pressure pump is used to inflate the gas tank, the pressure gauge is used to monitor the gas pressure in the gas tank in real time, and the safety valve is used to automatically open and release the pressure when the pressure exceeds the set value. The air outlet of the gas tank is connected to the air outlet of the rotary ball valve through a high-pressure oil pipe. The high-pressure oil pipe has the advantages of high pressure resistance and good corrosion resistance, ensuring the stable transmission of airflow. The present invention also provides a method for preparing peeled jujube powder, comprising the following steps: Step 1: select high-quality red dates and soak them in a soaking solution for 30 to 60 minutes, wherein the soaking solution includes 0.8 to 1.2% sodium alginate, 0.1 to 0.3% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step 3: Use the peeled jujube powder crushing device to feed the freeze-dried red dates from the feed port, and at the same time open the rotary ball valve corresponding to the first-stage air nozzle 601, release the high-pressure gas from the gas tank 700, transport it through the metal elbow 703 and spray it out from the first-stage air nozzle, so that the jujube fruits are evenly distributed and fall into the second cavity, start the motor to drive the rotating shaft to drive the crushing blades to rotate, crush the freeze-dried red dates, and at the same time open the rotary ball valve 704 corresponding to the second-stage air nozzle 603, release the high-pressure gas from the gas tank 700, and pass through the metal elbow 703 to crush the freeze-dried red dates. The jujube pulp and the jujube peel powder are transported through the tube 703 and ejected through the second-stage air nozzle 603 to promote the separation of the jujube flesh and the jujube peel, and the jujube pulp powder scraper and the jujube peel powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity. After the crushing is completed, the motor is turned off and the rotary ball valve 704 corresponding to the third-stage air nozzle 602 is opened. The high-pressure gas is released from the gas storage tank 700, transported through the metal elbow 703 and ejected through the third-stage air nozzle 602, the jujube peel powder is collected from the jujube peel powder discharge port, and the jujube pulp powder is collected from the jujube pulp powder discharge port to obtain peeled jujube powder.

[0039] The invention also provides peeled jujube powder prepared by the preparation method.

[0040] The present invention also provides an application of peeled jujube powder in preparing red jujube composite meal replacement powder. In this technical solution, sea buckthorn powder, pumpkin powder, yam powder, and Lactobacillus paracasei can be added to the peeled jujube powder to prepare the composite meal replacement powder, thereby improving the taste and increasing the nutrient content.

[0041] Example 1 A method for preparing peeled jujube powder comprises the following steps: Step 1: select high-quality red dates and soak them in a soaking solution for 45 minutes, wherein the soaking solution includes 1.0% sodium alginate, 0.2% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step three, using the peeled jujube powder crushing device of the present invention, feed the freeze-dried red dates from the feed port and make them fall into the second cavity, turn on the motor to drive the rotating shaft to drive the crushing blades to rotate, and crush the freeze-dried red dates. At the same time, the jujube meat powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity, collect the jujube skin powder from the jujube skin powder discharge port, and collect the jujube meat powder from the jujube meat powder discharge port to obtain peeled jujube powder.

[0042] Example 2 A method for preparing peeled jujube powder comprises the following steps: Step 1: select high-quality red dates and soak them in a soaking solution for 30 minutes, wherein the soaking solution includes 0.8% sodium alginate, 0.1% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step 3: Use the peeled jujube powder crushing device of the present invention to feed the freeze-dried red dates from the feed port and make them fall into the second cavity, turn on the motor to drive the rotating shaft to drive the crushing blades to rotate, and crush the freeze-dried red dates. At the same time, the jujube meat powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity, collect the jujube skin powder from the jujube skin powder discharge port, and collect the jujube meat powder from the jujube meat powder discharge port to obtain peeled jujube powder. Example 3 A method for preparing peeled jujube powder comprises the following steps: Step 1: select high-quality red dates and soak them in a soaking solution for 60 minutes, wherein the soaking solution includes 1.2% sodium alginate, 0.3% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step three, using the peeled jujube powder crushing device of the present invention, feed the freeze-dried red dates from the feed port and make them fall into the second cavity, turn on the motor to drive the rotating shaft to drive the crushing blades to rotate, and crush the freeze-dried red dates. At the same time, the jujube meat powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity, collect the jujube skin powder from the jujube skin powder discharge port, and collect the jujube meat powder from the jujube meat powder discharge port to obtain peeled jujube powder.

[0043] Comparative Example A method for preparing peeled jujube powder comprises the following steps: Step 1: Select high-quality red dates, rinse with water and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step three, using the peeled jujube powder crushing device of the present invention, feed the freeze-dried red dates from the feed port and make them fall into the second cavity, turn on the motor to drive the rotating shaft to drive the crushing blades to rotate, and crush the freeze-dried red dates. At the same time, the jujube meat powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity, collect the jujube skin powder from the jujube skin powder discharge port, and collect the jujube meat powder from the jujube meat powder discharge port to obtain peeled jujube powder.

[0044] Since the sugar content in the jujube peel is very low, while the sugar content in the jujube flesh is very high, the separation effect of the jujube peel and the jujube flesh is indicated by the difference in sugar content. The peeled jujube powder and jujube peel powder obtained in Examples 1 to 3 and the comparative example were respectively taken, and their total sugar contents were measured by the Film reagent method, and the results are shown in Table 1.

[0045] Table 1 Total sugar content in peeled jujube powder / % Total sugar content in jujube peel powder / % Example 1 68.3 0.85 Example 2 67.1 0.88 Example 3 68.0 0.86 Comparative Example 50.6 3.62 The results show that after the red dates are soaked and freeze-dried by the method of the present invention, they are crushed by the peeled date powder crushing device of the present invention. Finally, the total sugar content in the material collected from the first cavity 101 is high, and the total sugar content in the material collected from the second cavity 102 is low, which proves that the peeled date powder obtained in Examples 1 to 3 has less jujube peel content, and the jujube meat and jujube peel are well separated. In the comparative example, the red dates are directly freeze-dried and crushed, and the total sugar content in the material collected from the first cavity 101 is lower than that in Examples 1 to 3, which proves that the jujube peel content is slightly higher. This is because when the red dates are soaked in the soaking solution of the present invention, sodium alginate and citric acid can be combined with the jujube peel for penetration, reducing the adhesion of the jujube peel and the jujube meat, and then after freeze-drying and crushing, the weight of the jujube peel powder is increased, and under the action of gravity, the jujube peel powder is more retained in the second cavity, improving the separation effect of the jujube meat and the jujube peel.

[0046] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for crushing peeled jujube powder, characterized in that: Comprising: A cylinder body, inside which there are a first cavity and a second cavity that are connected to each other from top to bottom. At the bottom of the first cavity, there is an annular collection cavity coaxially connected. The collection cavity is coaxially arranged around the outer periphery of the second cavity, and the two are separated by an annular partition. At the top of the cylinder body, there is a feed inlet. At the bottom of the collection cavity, there is a date flesh powder discharge outlet. At the bottom of the second cavity, there is a date skin powder discharge outlet. A crushing assembly, which includes a rotating shaft coaxially arranged inside the cylinder body. The bottom of the rotating shaft is rotatably connected to the bottom wall of the second cavity. The top of the rotating shaft rotates out of the cylinder body and is connected to a motor. On the outer periphery of the rotating shaft, there are two crushing blades accommodated in the second cavity. Both crushing blades are in a V-shaped structure, and the two crushing blades are arranged in central symmetry. The feed inlet is close to the rotating shaft.

2. The device for crushing peeled jujube powder according to claim 1, characterized in that: The diameter of the first cavity is larger than that of the second cavity, and the outer diameter of the collection cavity is the same as the diameter of the first cavity, so that the side walls of the first cavity and the collection cavity are flush.

3. The device for crushing peeled jujube powder according to claim 1, characterized in that: On the outer periphery of the rotating shaft, there are also two scraping assemblies arranged oppositely. Each scraping assembly includes a date flesh powder scraping plate, a connecting plate, and a date skin powder scraping plate connected in sequence. The date flesh powder scraping plate is in a U-shaped structure, and there are a first scraping plate A, a first scraping plate B, and a first scraping plate C vertically connected in sequence. The connecting plate and the date skin powder scraping plate are both in an L-shaped structure. The connecting plate includes a connecting plate a and a connecting plate b connected vertically. The date skin powder scraping plate includes a second scraping plate A and a second scraping plate B connected vertically. Among them, the first scraping plate C is vertically connected to the connecting plate a, the connecting plate b is vertically connected to the second scraping plate A. The first scraping plate B is close to the side walls of the first cavity and the collection cavity. The first scraping plate C is close to the bottom wall of the collection cavity. The second scraping plate A is close to the side wall of the second cavity. The second scraping plate B is close to the bottom wall of the second cavity. And the first scraping plate B, the first scraping plate C, the second scraping plate A, and the second scraping plate B are all provided with bristles.

4. The device for crushing peeled jujube powder as claimed in claim 3, characterized in that: A sleeve is coaxially and rotatably sleeved on the outer periphery of the rotating shaft. The bottom of the rotating shaft extends beyond the bottom of the sleeve. The two crushing blades are fixedly connected to the rotating shaft. The first scraping plate A of the two scraping assemblies is vertically and fixedly connected to the sleeve.

5. The device for crushing peeled jujube powder as claimed in claim 4, characterized in that: At the top of the cylinder body, there is a housing connected by a plurality of support rods. The motor is installed in the housing. The sleeve rotates out of the cylinder body and rotates into the housing. The top of the rotating shaft extends beyond the top of the sleeve and is coaxially and fixedly sleeved with a first worm part. In the housing, there are also a rotating rod A and a rotating rod B installed. Both ends of the rotating rod A and the rotating rod B are rotatably connected to the inner wall of the housing. The rotating rod A, the rotating rod B, and the rotating shaft are all perpendicular to each other. On the outer periphery of the rotating rod A, there are a first worm gear and a second worm part coaxially and fixedly sleeved. On the outer periphery of the rotating rod B, there are a second worm gear and a third worm part coaxially and fixedly sleeved. On the outer periphery of the sleeve, there is a third worm gear coaxially and fixedly sleeved. Among them, the first worm part meshes and rotates with the first worm gear, the second worm part and the second worm gear, and the third worm part and the third worm gear. The thread pitches of the first worm part, the second worm part, and the third worm part gradually decrease.

6. The device for crushing peeled jujube powder according to claim 1, characterized in that: The cylinder is a double-wall structure, the cavity between the double walls is filled with cooling liquid, and the cylinder is provided with a liquid inlet and a liquid outlet communicated with the cavity.

7. The device for crushing peeled jujube powder according to claim 1, characterized in that: Also includes: The air jet assembly includes a plurality of first-stage air jet nozzles arranged near the feed port of the first cavity, a plurality of second-stage air jet nozzles arranged at the bottom of the second cavity, and a plurality of third-stage air jet nozzles respectively arranged near the jujube pulp powder discharge port of the collecting cavity and near the jujube peel powder discharge port of the second cavity and obliquely downward toward the discharge port; Each air nozzle is connected to the gas storage tank through a metal elbow, each metal elbow is installed with a rotary ball valve, and the gas storage tank is equipped with a manual pressure pump and a pressure gauge.

8. The device for crushing peeled jujube powder as claimed in claim 7, characterized in that: Each first-stage air nozzle is set to have an air pressure of 0.3 - 0.5 MPa, each second-stage air nozzle is set to have an air pressure of 0.2 - 0.3 MPa, and each third-stage air nozzle is set to have an air pressure of 0.1 - 0.2 MPa.

9. The device for crushing peeled jujube powder according to claim 7, characterized in that: There are four first-stage air nozzles, which are arranged in a circular array on the inner wall of the first cavity near the feed port. The angle between adjacent first-stage air nozzles is 90°. The whole is cylindrical, and the front end is a contracted air nozzle. Each first-stage air nozzle is fixed to a mounting hole opened on the inner wall of the first cavity by welding, and the air inlet at the rear end of the first-stage air nozzle is threadedly connected to the metal elbow. There are 6 second-stage air nozzles, which are arranged in a circular array at the bottom of the second cavity. The angle between adjacent second-stage air nozzles is 60°. The whole is L-shaped, the bending radius at the right-angle bend is 20mm, and the front end is a contracted air nozzle. The vertical part of the second-stage air nozzle is fixed to the mounting hole opened on the bottom of the second cavity by welding, and the air inlet of the second-stage air nozzle is threadedly connected to the metal elbow. The third-stage air nozzle is provided with two air nozzles in a relative manner near the jujube pulp powder discharge port in the collecting chamber, and two air nozzles are provided in a relative manner near the jujube peel powder discharge port in the second chamber. The whole is in the shape of a curved tube with a bending angle of 45°, obliquely downward toward the discharge port. The third-stage air nozzle is fixed to the mounting hole opened on the side wall of the corresponding discharge port by welding, and the air inlet of the third-stage air nozzle is threadedly connected to the metal curved tube; The bending radius of the bending part of the metal bent pipe is not less than 3 times of the pipe diameter, and the multiple metal bent pipes are connected to the gas storage tank by flanges; The diameter of the rotary ball valve is consistent with the diameter of the metal elbow, the valve stem of the ball valve extends out of the ball valve housing, and a rotary handle with a scale mark is installed at the end of the valve stem. The rotation angle range of the handle is 0-90°, corresponding to the closed and fully open states of the valve; The design pressure of the gas tank is 1MPa, and the working pressure is controlled between 0.5-0.8MPa. A manual pressure pump, a pressure gauge and a safety valve are arranged on the top of the gas tank. The maximum output pressure of the manual pressure pump is not less than 1.2MPa. The manual pressure pump is connected to the gas tank through a high-pressure oil pipe. The pressure resistance value of the high-pressure oil pipe is not less than 1.5MPa. The range of the pressure gauge is 0-1MPa. A spring-loaded safety valve is installed on the interface of the safety valve, and the opening pressure is set to 0.85MPa. When the pressure in the gas tank exceeds the set value, the safety valve automatically opens to release the pressure.

10. A method for preparing peeled jujube powder, characterized in that: The following steps are involved: Step 1: select high-quality red dates and soak them in a soaking solution for 30 to 60 minutes, wherein the soaking solution includes 0.8 to 1.2% sodium alginate, 0.1 to 0.3% citric acid and water, rinse with clean water, and remove the core; Step 2: Place the pitted red dates in a -80°C refrigerator and freeze for 12 hours, then transfer to a vacuum freeze dryer and dry for 48 hours, with the vacuum degree controlled at 15 Pa, to obtain freeze-dried red dates with a moisture content of less than 5%; Step 3, using the peeled jujube powder crushing device as described in any one of claims 1 to 9, the freeze-dried red dates are fed from the feed port, and the rotary ball valve corresponding to the first-stage air nozzle 601 is opened at the same time, and high-pressure gas is released from the gas storage tank 700, transported through the metal elbow 703 and sprayed out from the first-stage air nozzle, so that the jujube fruits are evenly distributed and fall into the second cavity, and the motor is turned on to drive the rotating shaft to drive the crushing blades to rotate, and the freeze-dried red dates are crushed, and the rotary ball valve 704 corresponding to the second-stage air nozzle 603 is opened at the same time, and the high-pressure gas is released from the gas storage tank. 700, transported through the metal elbow 703 and ejected from the second-stage air nozzle 603, and the jujube meat powder scraper and the jujube peel powder scraper rotate with the rotating shaft to scrape the side walls of the first cavity and the second cavity. After the crushing is completed, the motor is turned off, and the rotary ball valve 704 corresponding to the third-stage air nozzle 602 is opened, and the high-pressure gas is released from the gas storage tank 700, transported through the metal elbow 703 and ejected from the third-stage air nozzle 602, the jujube peel powder is collected from the jujube peel powder discharge port, and the jujube meat powder is collected from the jujube meat powder discharge port to obtain peeled jujube powder.

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