Peeling jujube powder pulverizing device and preparation method and application thereof

Abstract

This invention discloses a jujube powder pulverizing device, its preparation method, and its application. The jujube powder pulverizing device includes a cylindrical body and a pulverizing component. The interior of the cylindrical body has a first cavity and a second cavity that are interconnected from top to bottom. The bottom of the first cavity is coaxially connected to an annular collecting cavity, which is coaxially arranged around the outer periphery of the second cavity. The two are separated by an annular partition. The top of the cylindrical body has a feed inlet, the bottom of the collecting cavity has a jujube pulp powder outlet, and the bottom of the second cavity has a jujube peel powder outlet. The pulverizing component includes a rotating shaft coaxially arranged inside the cylindrical body. The bottom of the rotating shaft is rotatably connected to the bottom wall of the second cavity, and the top of the rotating shaft rotatably extends out of the cylindrical body and is connected to a motor. Two pulverizing blades are arranged on the outer periphery of the rotating shaft. This invention can pulverize jujubes and separate the jujube pulp powder and jujube peel powder, achieving direct jujube peeling with high efficiency.

Description

Technical Field

[0001] This invention relates to the field of jujube pulverization technology. More specifically, this invention relates to a device for pulverizing peeled jujube powder, its preparation method, and its application. Background Technology

[0002] In the production and processing of jujube powder, the raw jujubes need to be peeled and pitted before being pulverized. For example, the invention patent application CN110089660A discloses a jujube peeling process and a method for preparing ultrafine jujube powder, which does not cause the loss of nutrients and flavor substances, reduces the complexity of the process, and ensures the cleanliness of the peeling. However, the peeling process still affects the pulverization efficiency and has room for improvement. Summary of the Invention

[0003] One objective of this invention is to provide a jujube powder pulverizing device, its preparation method, and its application. This device eliminates the need to peel the jujubes, achieving jujube peeling through the separation of jujube fruit powder and jujube skin powder. It also provides good pulverizing effect and high working efficiency.

[0004] To achieve these objectives and other advantages of the present invention, according to one aspect of the present invention, a device for pulverizing peeled jujube powder is provided, comprising:

[0005] The cylinder has a first cavity and a second cavity that are connected to each other from top to bottom. The bottom of the first cavity is coaxially connected to an annular collection cavity. The collection cavity is coaxially arranged around the outer periphery of the second cavity. The two are separated by an annular partition. The top of the cylinder has a feed inlet. The bottom of the collection cavity has a jujube pulp powder outlet. The bottom of the second cavity has a jujube peel powder outlet.

[0006] The crushing assembly includes a rotating shaft coaxially disposed within 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 out of the cylinder and is connected to a motor. Two crushing blades are disposed on the outer periphery of the rotating shaft and are accommodated in the second cavity. Both crushing blades are V-shaped and are arranged in a centrally symmetrical manner. The feed inlet is close to the rotating shaft.

[0007] Preferably, the diameter of the first cavity is larger than the diameter of the second cavity, and the outer diameter of the collecting cavity is the same as the diameter of the first cavity, so that the sidewalls of the first cavity and the collecting cavity are flush.

[0008] Preferably, two scraping assemblies are also arranged opposite each other on the outer periphery of the rotating shaft. Each scraping assembly includes a jujube pulp powder scraper, a connecting plate, and a jujube peel powder scraper connected in sequence. The jujube pulp powder scraper has a U-shaped structure and is provided with a first scraper A, a first scraper B, and a first scraper C connected vertically in sequence. The connecting plate and the jujube peel powder scraper are both L-shaped structures. The connecting plate includes a connecting plate a and a connecting plate b connected vertically. The jujube peel powder scraper includes a second scraper A and a second scraper B connected vertically. The first scraper C is perpendicularly connected to the connecting plate a, and the connecting plate b is perpendicularly connected to the second scraper A. The first scraper B is close to the side wall 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, and the second scraper B is close to the bottom wall of the second cavity. The first scraper B, the first scraper C, the second scraper A, and the second scraper B are all provided with bristles.

[0009] Preferably, a sleeve is coaxially rotatably fitted around 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, and the first scraper A of the two scraping assemblies is vertically fixedly connected to the sleeve.

[0010] Preferably, the top of the cylinder is connected to a housing via multiple support rods. The motor is installed inside the housing. The sleeve rotates out of the cylinder and into the housing. The top of the rotating shaft extends beyond the top of the sleeve and is coaxially fixedly fitted with a first worm gear portion. Rotating rod A and rotating rod B are also installed inside the housing. Both ends of rotating rod A and rotating rod B are rotatably connected to the inner wall of the housing. Rotating rod A, rotating rod B, and rotating shaft are all perpendicular to each other. A first worm wheel and a second worm gear portion are coaxially fixedly fitted on the outer periphery of rotating rod A. A second worm wheel and a third worm gear portion are coaxially fixedly fitted on the outer periphery of rotating rod B. A third worm wheel is coaxially fixedly fitted on the outer periphery of the sleeve. The first worm gear portion meshes and rotates with the first worm wheel, the second worm gear portion and the second worm wheel, the third worm gear portion and the third worm wheel. The thread pitch of the first worm gear portion, the second worm gear portion and the third worm gear portion gradually decreases.

[0011] Preferably, the cylinder has a double-walled structure, the cavity between the two walls is filled with cooling liquid, and the cylinder is provided with an inlet and an outlet communicating with the cavity.

[0012] Preferably, it also includes:

[0013] The jet assembly includes multiple first-stage jet nozzles located near the inlet of the first chamber, multiple second-stage jet nozzles located at the bottom of the second chamber, and multiple third-stage jet nozzles located near the jujube pulp powder outlet of the collection chamber and near the jujube peel powder outlet of the second chamber, respectively, and angled downward toward the outlet.

[0014] Each jet nozzle is connected to the air tank via a metal bend, and a rotary ball valve is installed on each metal bend. The air tank is equipped with a manual pressure pump and a pressure gauge.

[0015] Preferably, each first jet nozzle is set to a jet pressure of 0.3-0.5 MPa, each second jet nozzle is set to a jet pressure of 0.2-0.3 MPa, and each third jet nozzle is set to a jet pressure of 0.1-0.2 MPa.

[0016] Preferably, there are four first-stage jet nozzles arranged in a circumferential array on the inner wall of the first cavity near the feed inlet. The included angle between adjacent first-stage jet nozzles is 90°. The whole is cylindrical with a constricted jet nozzle at the front end. Each first-stage jet nozzle is fixed to the mounting hole on the inner wall of the first cavity by welding. The air inlet at the rear end of the first-stage jet nozzle is connected to the metal bend pipe by thread.

[0017] The second section has 6 nozzles arranged in a circular array at the bottom of the second cavity. The included angle between adjacent second nozzles is 60°. The overall shape is L-shaped with a bending radius of 20mm at the right angle bend. The front end is a constricted nozzle. The vertical part of the second nozzle is fixed to the mounting hole on the bottom of the second cavity by welding. The air inlet of the second nozzle is connected to the metal bend by thread.

[0018] Two third-stage jet nozzles are arranged opposite each other in the collection chamber near the jujube pulp powder outlet, and two are also arranged opposite each other in the second chamber near the jujube peel powder outlet. The whole is in the shape of a bent tube with a bending angle of 45°, and it is inclined downward towards the outlet. The third-stage jet nozzles are fixed to the mounting holes opened on the side wall of the corresponding outlet by welding. The air inlet of the third-stage jet nozzle is connected to the metal bent tube by thread.

[0019] The bending radius of the metal bend is not less than 3 times the pipe diameter, and multiple metal bends are connected to the gas storage tank by flanges.

[0020] The diameter of the rotary ball valve is the same as that of the metal bend. The valve stem extends out of the valve housing and a rotary handle with scale markings is installed at the end of the valve stem. The rotation angle of the handle is 0-90°, corresponding to the closed and fully open states of the valve.

[0021] The gas storage tank is designed to operate at a pressure of 1 MPa, with the working pressure controlled between 0.5 and 0.8 MPa. A manual pressure pump, a pressure gauge, and a safety valve are installed on the top of the gas storage tank. The maximum output pressure of the manual pressure pump is no less than 1.2 MPa. The manual pressure pump is connected to the gas storage tank via a high-pressure oil pipe with a pressure resistance of no less than 1.5 MPa. The pressure gauge has a range of 0 to 1 MPa. The safety valve is fitted with a spring-loaded safety valve with a set opening pressure of 0.85 MPa. When the pressure inside the gas storage tank exceeds the set value, the safety valve automatically opens to release pressure.

[0022] This invention also provides a method for preparing peeled jujube powder, comprising the following steps:

[0023] Step 1: Select high-quality red dates and soak them in a soaking solution for 30-60 minutes. The soaking solution includes 0.8-1.2% sodium alginate, 0.1-0.3% citric acid and water. Rinse with clean water and remove the pits.

[0024] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0025] Step 3: Using the aforementioned jujube powder pulverizing device, the freeze-dried jujubes are fed into the inlet. Simultaneously, the rotary ball valve corresponding to the first jet nozzle 601 is opened, releasing high-pressure gas from the storage tank 700. This gas is then conveyed through the metal bend 703 and ejected from the first jet nozzle, ensuring the jujubes are evenly distributed and fall into the second chamber. The motor is then activated to drive the rotating shaft, rotating the pulverizing blades to pulverize the freeze-dried jujubes. Simultaneously, the rotary ball valve 704 corresponding to the second jet nozzle 603 is opened, releasing high-pressure gas from the storage tank 700. This gas is then conveyed through the metal bend 703 and ejected from the first jet nozzle, causing the jujubes to fall evenly into the second chamber. Pipe 703 conveys and sprays out through the second jet nozzle 603, promoting the separation of jujube pulp and jujube skin. The jujube pulp powder scraper and jujube skin powder scraper rotate with the rotating shaft, scraping the side walls of the first and second cavities. After pulverization, the motor is turned off, and the rotary ball valve 704 corresponding to the third jet nozzle 602 is opened. High-pressure gas is released from the gas storage tank 700, conveyed through the metal bend pipe 703, and sprayed out through the third jet nozzle 602. Jujube skin powder is collected from the jujube skin powder outlet, and jujube pulp powder is collected from the jujube pulp powder outlet, thus obtaining peeled jujube powder.

[0026] The present invention also provides a peeled jujube powder prepared by the above preparation method.

[0027] This invention also provides an application of peeled jujube powder in the preparation of jujube compound meal replacement powder.

[0028] The present invention has at least the following beneficial effects:

[0029] First, this invention utilizes unique pulverizing blades to pulverize pitted jujubes (without peeling) into ultrafine powder. During the pulverizing process, the agitation of the pulverizing blades causes gas flow within the second chamber, creating a pressure difference around the powder particles and generating buoyancy. Because the jujube flesh is relatively soft, it is more easily pulverized into fine particles during the pulverizing process, making it easier to move within the material system and exhibiting relatively good fluidity, allowing it to move upwards and enter the first chamber more easily. In contrast, the jujube peel is tough, and the pulverized particles are relatively large and compact, with poor mobility. Furthermore, the presence of the annular partition restricts the movement path of the peel powder to some extent, making it more difficult for the peel powder to enter the first chamber, thus remaining in the second chamber. This achieves direct separation of the jujube fruit and peel during the pulverizing process with good separation effect. The scraping component scrapes the side walls of the first and second chambers, and the powder is collected through the jujube flesh powder outlet and the jujube peel powder outlet, resulting in high working efficiency.

[0030] Secondly, before pulverizing the jujubes, the present invention involves soaking and freeze-drying. The sodium alginate in the soaking solution is a hydrophilic high-molecular-weight polysaccharide with a large number of carboxyl groups (-COOH) on its molecular chain. The jujube peel has many tiny pores and channels on its surface and inside. Due to its hydrophilicity, sodium alginate molecules can swell in the aqueous solution and gradually diffuse into these pores. Simultaneously, the carboxyl groups can undergo ion exchange reactions with some metal ions (such as calcium ions) in the jujube peel, forming cross-linked structures, thus firmly binding sodium alginate to the jujube peel. Citric acid is an organic acid with three carboxyl groups, capable of neutralizing alkaline substances (such as certain proteins and alkaloids) in the jujube peel. Furthermore, its carboxyl groups can also form stable complexes with metal ions in the jujube peel. These reactions allow citric acid to penetrate deeply into the jujube peel and bind tightly to it. After sodium alginate and citric acid bind to the jujube peel, the adhesion between the peel and the pulp is reduced, making them easier to separate during the pulverization process, and the separation effect is good.

[0031] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the peeled jujube powder pulverizing device according to one technical solution of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the cylindrical body according to one technical solution of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the scraping assembly described in one technical solution of the present invention;

[0035] Figure 4 This is a schematic diagram of the internal structure of the housing in one technical solution of the present invention;

[0036] Figure 5 A schematic diagram of the jet assembly described in one technical solution of the present invention;

[0037] Figure 6 A schematic diagram of the air outlet structure of any second section of the air nozzle in one technical solution of the present invention;

[0038] Figure 7 A schematic diagram of the structure of the gas storage tank in one technical solution of the present invention. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can implement it based on the description.

[0040] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0041] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] like Figures 1-4 As shown, the present invention provides a device for pulverizing peeled jujube powder, comprising:

[0043] The cylindrical body 100 has a first cavity 101 and a second cavity 102 that are interconnected from top to bottom. The bottom of the first cavity 101 is coaxially connected to an annular collection cavity 103. The collection 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 cylindrical body 100 is provided with a feed inlet 105. The bottom of the collection cavity 103 is provided with a jujube pulp powder outlet 106. The bottom of the second cavity 102 is provided with a jujube peel powder outlet 107.

[0044] The crushing assembly includes a rotating shaft 200 coaxially disposed within 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 and is connected to a motor 201. Two crushing blades 202 are disposed on the outer periphery of the rotating shaft 200 and are accommodated in the second cavity 102. Both crushing blades 202 have a V-shaped structure and are arranged in a centrally symmetrical manner. The feed inlet 105 is close to the rotating shaft 200.

[0045] The peeled jujube powder pulverizing device described in the above technical solution includes a cylinder 100 and a pulverizing component. The cylinder 100 is internally divided into two interconnected chambers, a first chamber 101 and a second chamber 102. An annular collecting chamber 103 is provided at the bottom of the first chamber 101, and the collecting chamber 103 is coaxially arranged around the periphery of the second chamber 102. The collecting chamber 103 and the second chamber 102 are separated by an annular partition 104. A feed inlet 105 is provided at the top of the cylinder 100, a jujube pulp powder outlet 106 is provided at the bottom of the collecting chamber 103, and a jujube peel powder outlet 107 is provided at the bottom of the second chamber 102. A rotating shaft 200 is provided inside the cylinder 100. The bottom of the rotating shaft 200 is rotatably connected to the bottom wall of the second chamber 102, and the top of the rotating shaft 200 rotatably exits the cylinder 100 through a sealed bearing and is connected to a motor 201. Two crushing blades 202 are provided on the outer periphery of the rotating shaft 200. Both crushing blades 202 adopt a V-shaped structure design and are arranged in a centrally symmetrical manner on the rotating shaft 200. In operation, pitted jujubes are freeze-dried until their moisture content is below 5%. They are then fed into the second chamber 102 through inlet 105. Motor 201 drives shaft 200, rotating two pulverizing blades 202 to pulverize the jujubes into ultrafine powder. The lighter jujube powder rises due to airflow and is then concentrated on the side wall of the first chamber 101 by centrifugal force. The heavier jujube peel powder lies below the jujube flesh powder and is retained on the side wall of the second chamber 102 by the obstruction of the annular partition 104, achieving direct separation of the jujube fruit and peel. The jujube fruit powder falls into collection chamber 103 and is collected by jujube flesh powder outlet 106, while the jujube peel powder is collected by jujube peel powder outlet 107, thus completing the peeling and pulverizing process. The annular partition 104 in this technical solution ensures a reasonable flow direction for the jujube fruit powder and jujube peel powder and avoids mixing between them. The uniquely shaped crushing blades 202 not only increase the contact area with the jujube material, ensuring the uniformity and efficiency of the mixing process, but also effectively cut the jujube material, crushing the jujube into ultrafine powder. Furthermore, the jujube fruit and skin can be directly separated at the same time as crushing, resulting in a good separation effect.

[0046] In another technical solution, the diameter of the first cavity 101 is larger than the diameter of the second cavity 102, and the outer diameter of the collecting cavity 103 is the same as the diameter of the first cavity 101, so that the sidewalls of the first cavity 101 and the collecting cavity 103 are flush. In this technical solution, the sidewall of the collecting cavity 103 is flush with the sidewall of the first cavity 101, which facilitates the smooth falling of jujube powder into the collecting cavity 103 and makes collection convenient.

[0047] In another technical solution, two scraping assemblies are also arranged opposite each other on the outer periphery of the rotating shaft 200. Each scraping assembly includes a jujube pulp powder scraper, a connecting plate, and a jujube peel powder scraper connected in sequence. The jujube pulp powder scraper has 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 connecting plate a303 and a connecting plate b304 connected vertically. The jujube peel powder scraper includes a second scraper A305 and a second scraper B306 connected vertically. The first scraper C302 is perpendicularly connected to the connecting plate a303, and the connecting plate b304 is perpendicularly connected to the second scraper A305. The first scraper B301 is close to the side wall 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, and the second scraper B306 is close to the bottom wall of the second cavity 102. All three scrapers are equipped with bristles. In this technical solution, due to centrifugal force, the jujube pulp powder and jujube peel powder after being crushed and separated are mostly located on the side walls of the first cavity 101 and the second cavity 102. Manual collection is time-consuming and laborious; therefore, two scraping components are designed for automatic scraping and collection. The first scraper B301 scrapes the side walls of the first cavity 101 and the collection cavity 103, which can scrape the jujube pulp powder into the collection cavity 103. Then, the first scraper C302 scrapes the bottom wall of the collection cavity 103, so that the jujube pulp powder is discharged through the jujube pulp powder outlet 106 for automatic collection. The second scraper A305 scrapes the side wall of the second cavity 102, and the second scraper B306 scrapes the bottom wall of the second cavity 102, so that the jujube peel powder is discharged through the jujube peel powder outlet 107 for automatic collection, which improves the convenience of use.

[0048] In another technical solution, a sleeve 203 is coaxially rotatably fitted around the outer periphery of the rotating shaft 200, with the bottom of the rotating shaft 200 extending beyond the bottom of the sleeve 203. Two crushing blades 202 are fixedly connected to the rotating shaft 200, and the first scraper A300 of the two scraping assemblies is vertically fixedly connected to the sleeve 203. In this technical solution, the upper half of the rotating shaft 200 is coaxially fitted with a sleeve 203 via a bearing, allowing the sleeve 203 to rotate freely around the outer periphery of the rotating shaft 200. Both sets of scraping assemblies are connected to the sleeve 203, and the two crushing blades 202 are connected to the rotating shaft 200, enabling the scraping assemblies and the crushing blades 202 to rotate independently.

[0049] In another technical solution, the top of the cylinder 100 is connected to a housing 400 via multiple support rods 401. The motor 201 is installed inside the housing 400. The sleeve 203 rotates out of the cylinder 100 and rotates into the housing 400. The top of the rotating shaft 200 extends beyond the top of the sleeve 203 and is coaxially fixedly sleeved with a first worm gear 402. Rotating rods A403 and B404 are also installed inside the housing 400. Both ends of rotating rods A403 and B404 are rotatably connected to the inner wall of the housing 400. All rotating shafts 200 are perpendicular to each other. A first worm gear 405 and a second worm portion 406 are coaxially and fixedly sleeved on the outer periphery of rotating rod A403. A second worm gear 407 and a third worm portion 408 are coaxially and fixedly sleeved on the outer periphery of rotating rod B404. A third worm gear 409 is coaxially and fixedly sleeved on the outer periphery of sleeve 203. The first worm portion 402 meshes with and rotates with the first worm gear 405, the second worm portion 406, the second worm gear 407, the third worm portion 408, and the third worm gear 409. The thread pitch of the first worm portion 402, the second worm portion 406, and the third worm portion 408 gradually decreases. In this technical solution, the top of the cylinder 100 is connected to the housing 400 via multiple sturdy and durable support rods 401. The housing 400 provides a stable mounting platform for the motor 201. The sleeve 203 rotates freely through the cylinder 100 and smoothly rotates into the housing 400, ensuring seamless power transmission. The top of the rotating shaft 200 extends beyond the top of the sleeve 203, and a first worm gear portion 402 is coaxially fixedly mounted on the extended portion. Inside the housing 400, rotating rods A403 and B404 are also installed. The two ends of the two rotating rods are rotatably connected to the inner wall of the housing 400 via bearings, ensuring stability and reliability during transmission. Rotating rods A403 and B404, as well as the rotating shaft 200, are perpendicular to each other. On the outer periphery of rotating rod A403, a first worm wheel 405 and a second worm gear portion 406 are coaxially fixedly mounted, and on the outer periphery of rotating rod B404, a second worm wheel 407 and a third worm gear portion 408 are fixedly sleeved. The design of these worm wheels and worm gear portions not only considers the accuracy and efficiency of transmission but also fully considers their meshing effect and wear resistance. The outer periphery of the sleeve 203 is also coaxially fixedly fitted with the third worm gear 409. In this complex transmission system, precise meshing rotation is achieved between the first worm portion 402 and the first worm gear 405, the second worm portion 406 and the second worm gear 407, and the third worm portion 408 and the third worm gear 409, ensuring the stability and reliability of the transmission.The thread pitch of the first worm portion 402, the second worm portion 406, and the third worm portion 408 is cleverly designed to gradually decrease, thereby gradually reducing the rotational speed of the first worm wheel 405, the second worm wheel 407, and the third worm wheel 409, and thus reducing the rotational speed of the sleeve 203 along with the two scraping components, so that the rotational speed of the two scraping components meets the scraping requirements, and can avoid the problem of powder flying due to excessive rotational speed.

[0050] In another technical solution, the cylinder 100 has a double-walled structure, and the cavity 108 between the two walls is filled with cooling liquid. The cylinder 100 is provided with an inlet 109 and an outlet 110 communicating with the cavity 108. In this technical solution, the cavity 108 is filled with cooling liquid to maintain a low temperature inside the cylinder 100, preventing the jujube powder from clumping due to high temperature. The inlet 109 and outlet 110 facilitate the introduction or discharge of cooling liquid into the cavity 108, allowing it to be connected to a circulating pump or a refrigeration unit to improve the cooling effect.

[0051] In another technical solution, as shown in Figure 5, an air jet assembly is also provided, including a first air jet nozzle 601 located near the inlet of the first chamber, a second air jet nozzle 603 located at the bottom of the second chamber, and a third air jet nozzle 602 located near the jujube pulp powder outlet of the collecting chamber and near the jujube peel powder outlet of the second chamber, respectively, and angled downwards towards the outlet. As shown in Figure 7, each air jet nozzle is connected to the air storage tank 700 via a metal bend, and a rotary ball valve 704 is installed on each metal bend 703. The air 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 jets of each air jet nozzle through the rotary ball valve 704 and adjusts the air pressure of the air storage tank 700 using the manual pressure pump 702. The manual pressure pump can be an AULLTE brand ADLL702 manual hydraulic pump. In this technical solution, multiple first air jet nozzles 601 are provided near the inlet of the first chamber. The main function of the jet nozzle is to disperse the freeze-dried red dates with high-speed airflow, helping the dates to distribute evenly after entering the first chamber, preventing them from accumulating or getting stuck in the chamber, thus affecting the subsequent crushing and separation effect. Multiple second-stage jet nozzles 603 are installed at the bottom of the second chamber. The main function of these jet nozzles is to further promote the separation of date flesh and skin, and to assist the date flesh powder in moving towards the collection chamber. Since the second chamber is the key area for separating date flesh and skin, the design of the second-stage jet nozzles 603 ensures that the date flesh powder can be smoothly separated from the date skin and enter the collection chamber along the set path. Third-stage jet nozzles 602 are installed at angled downwards towards the discharge ports of the second chamber and the second chamber, near the date flesh powder discharge port. The main function of these jet nozzles is to accelerate the discharge of date flesh powder and date skin powder, preventing the powder from accumulating or clogging near the discharge port, ensuring that the powder can be smoothly discharged from the discharge port. The working principle of the jet assembly is mainly based on the jetting effect of high-pressure gas. High-pressure gas in the gas storage tank 700 is delivered to each nozzle via a metal bend 703. The operator controls the jetting state of each nozzle using a rotary ball valve 704. When jetting is needed, the operator opens the corresponding rotary ball valve 704, releasing the high-pressure gas from the gas storage tank 700. The gas is then delivered to the nozzle via the metal bend 703 and finally ejected at a specific speed and direction. During the jetting process, the high-pressure gas not only helps to evenly distribute the jujubes, separate the jujube flesh from the skin, and facilitate the smooth discharge of powder, but also reduces dust and residue buildup inside the equipment, improving its cleanliness and lifespan.

[0052] In another technical solution, the first jet nozzle 601 is set with a jet pressure of 0.3-0.5 MPa to disperse the freeze-dried red dates with a high-speed airflow. The second jet nozzle 603 is set with a jet pressure of 0.2-0.3 MPa to enhance the separation of date flesh and skin. The third jet nozzle 602 is set with a jet pressure of 0.1-0.2 MPa to assist in the discharge of date flesh and skin. In this technical solution, the first jet nozzle 601 is set with a jet pressure in the range of 0.3 to 0.5 MPa. This aims to effectively disperse the freeze-dried red dates entering the equipment using a high-speed airflow. When the red dates enter the first chamber, the first jet nozzle 601 impacts the red dates with a powerful airflow, causing them to quickly disperse and fall evenly into the subsequent crushing area. This setup not only improves the crushing efficiency of the red dates but also helps reduce the accumulation and blockage of red dates in the chamber, thereby improving overall production efficiency. The second jet nozzle 603 is set with a jet pressure between 0.2 and 0.3 MPa. The first stage of the jet nozzle is mainly used to enhance the separation process between the jujube pulp and skin. In the second chamber, after the jujubes are initially crushed, the pulp and skin begin to separate gradually. At this point, the second jet nozzle 603 uses a moderate airflow to further impact and agitate the jujubes, loosening the connection between the pulp and skin, thus accelerating their separation. This design not only improves the separation efficiency of the pulp and skin but also helps reduce residue and improve product quality. The third jet nozzle 602 is set with a jet pressure in the range of 0.1 to 0.2 MPa. This stage of the jet nozzle mainly assists in the discharge process of the jujube pulp and skin. Near the discharge port in the collection chamber and the second chamber, the third jet nozzle 602 guides the jujube pulp powder and skin powder with a gentle airflow, helping them to discharge smoothly from the equipment. This setting not only ensures the stability of the discharge but also helps reduce the accumulation and blockage of powder near the discharge port, thereby further improving production efficiency. By precisely setting the jet pressure of each jet nozzle and rationally designing the jet direction, it is possible to efficiently break down red dates, enhance the separation of date flesh and skin, and assist in the discharge of powder during the processing of date powder.

[0053] In another technical solution, there are four first-stage jet nozzles 601, arranged in a circumferential array on the inner wall of the first cavity near the feed inlet. The included angle between adjacent first-stage jet nozzles 601 is 90°. They are made of stainless steel, are cylindrical in shape, and have a constricted jet nozzle at the front end. The first-stage jet nozzles 601 are fixed to the mounting holes opened on the inner wall of the first cavity by welding. The air inlet of the first-stage jet nozzles 601 is connected to the metal bend pipe by thread.

[0054] like Figure 6As shown, there are six second-stage jet nozzles 603 arranged in a circular array at the bottom of the second cavity. The included angle between adjacent second-stage jet nozzles 603 is 60°. They are made of stainless steel, are L-shaped overall, with a bending radius of 20mm at the right-angle bend, and have a constricted jet nozzle at the front end. The vertical part of the second-stage jet nozzle 603 is fixed to the mounting hole on the bottom of the second cavity by welding. The air inlet of the second-stage jet nozzle 603 is connected to the metal bend pipe by a thread. Figure 6 In the middle, the jet nozzle of one of the second jet nozzles is marked as 6031.

[0055] The third-stage jet nozzle 602: Two nozzles are arranged opposite each other in the collection chamber near the jujube pulp powder outlet, and two nozzles are also arranged opposite each other in the second chamber near the jujube peel powder outlet. They are made of stainless steel, and are in the shape of a bent tube with a bending angle of 45°, facing downwards towards the outlet. The third-stage jet nozzle 602 is fixed to the mounting hole on the side wall of the corresponding outlet by welding. The air inlet of the third-stage jet nozzle is connected to the metal bent tube by thread.

[0056] 703 Metal Bend: Made of seamless steel pipe of 304 stainless steel, the outlet pipe diameter is matched with the inner diameter of each section of the jet nozzle, the bending radius of the metal bend is not less than 3 times the pipe diameter, and the connection of the metal bend air tank is connected by flange.

[0057] Rotary ball valve 704: A copper ball valve is selected. The diameter of the ball valve is the same as the diameter of the metal bend. The valve stem extends out of the ball valve housing. A rotary handle with scale markings is installed at the end of the valve stem. The rotation angle of the handle is 0-90°, corresponding to the closed and fully open states of the valve.

[0058] Air 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. The top of the air tank is equipped with a manual pressure pump, a pressure gauge, and a safety valve. The manual pressure pump is a plunger-type manual pressure pump made of aluminum alloy, with a maximum output pressure of not less than 1.2MPa. The pressure pump is connected to the air tank via a high-pressure oil pipe with a pressure resistance of not less than 1.5MPa. The pressure gauge has a range of 0-1MPa. The safety valve interface is equipped with a spring-loaded safety valve with a set opening pressure of 0.85MPa. When the pressure inside the air tank exceeds the set value, the safety valve automatically opens to release pressure.

[0059] In the above technical solution, four mounting holes are drilled on the inner wall of the first cavity near the feed inlet, according to preset positions and angles (90° intervals). The air nozzles are inserted one by one into the corresponding mounting holes, ensuring that the constricted air outlet of the nozzle faces inwards towards the cavity. The air nozzles are made of stainless steel, are cylindrical in shape, and possess corrosion resistance and wear resistance. The air nozzles are welded to the inner wall of the cavity to ensure a firm connection and good sealing. One end of a metal bend is connected to the air inlet of the air nozzle using welding equipment via threads, ensuring a tight, leak-free connection. The metal bend is made of stainless steel, possessing high strength and corrosion resistance.

[0060] At the bottom of the second chamber, six mounting holes are drilled according to preset positions and angles (60° intervals). The air nozzles are inserted one by one into their corresponding mounting holes, ensuring that their right-angle bends face the correct direction. The air nozzles are also made of stainless steel, with an overall L-shape and a moderate bending radius at the right-angle bends to minimize airflow loss. The air nozzles are then welded to the bottom of the chamber using welding equipment. The other end of the metal bend is then connected to the air inlet of the air nozzle via threads.

[0061] Two mounting holes are drilled in the collecting chamber near the jujube pulp powder outlet and in the second chamber near the jujube peel powder outlet. The air nozzles are inserted one by one into their corresponding mounting holes, ensuring they are angled downwards towards the outlet. The air nozzles are designed as stainless steel bent tubes with a moderate bending angle to enhance airflow guidance. The air nozzles are welded to the sidewalls of the chambers using welding equipment. The metal bent tubes are then connected to the air inlets of the air nozzles via threads.

[0062] The other end of the metal bend is connected to the air inlet of the rotary ball valve via a flange. Flange connections offer advantages such as simple structure and good sealing. The rotary ball valve is made of copper, providing corrosion resistance and excellent sealing performance. The valve's diameter matches the diameter of the metal bend to ensure smooth airflow. A rotary handle with graduated markings is installed at the end of the ball valve stem for easy operation and control of airflow opening and closing.

[0063] The gas storage tank is made of high-strength carbon steel, with a design pressure of 1 MPa and a working pressure controlled between 0.5 and 0.8 MPa. A manual pressure pump, pressure gauge, and safety valve are installed on the top of the gas storage tank. The manual pressure pump is used to fill the tank with gas, the pressure gauge is used to monitor the gas pressure in the tank in real time, and the safety valve automatically opens to release pressure when the pressure exceeds the set value. The gas outlet of the storage tank is connected to the outlet of a rotary ball valve via a high-pressure oil pipe. The high-pressure oil pipe has advantages such as high pressure resistance and good corrosion resistance, ensuring stable gas flow. This invention also provides a method for preparing peeled jujube powder, including the following steps:

[0064] Step 1: Select high-quality red dates and soak them in a soaking solution for 30-60 minutes. The soaking solution includes 0.8-1.2% sodium alginate, 0.1-0.3% citric acid and water. Rinse with clean water and remove the pits.

[0065] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0066] Step 3: Using the aforementioned jujube powder pulverizing device, the freeze-dried jujubes are fed into the inlet. Simultaneously, the rotary ball valve corresponding to the first jet nozzle 601 is opened, releasing high-pressure gas from the storage tank 700. This gas is then conveyed through the metal bend 703 and ejected from the first jet nozzle, ensuring the jujubes are evenly distributed and fall into the second chamber. The motor is then activated to drive the rotating shaft, rotating the pulverizing blades to pulverize the freeze-dried jujubes. Simultaneously, the rotary ball valve 704 corresponding to the second jet nozzle 603 is opened, releasing high-pressure gas from the storage tank 700. This gas is then conveyed through the metal bend 703 and ejected from the first jet nozzle, causing the jujubes to fall evenly into the second chamber. Pipe 703 conveys and sprays out through the second jet nozzle 603, promoting the separation of jujube pulp and jujube skin. The jujube pulp powder scraper and jujube skin powder scraper rotate with the rotating shaft, scraping the side walls of the first and second cavities. After pulverization, the motor is turned off, and the rotary ball valve 704 corresponding to the third jet nozzle 602 is opened. High-pressure gas is released from the gas storage tank 700, conveyed through the metal bend pipe 703, and sprayed out through the third jet nozzle 602. Jujube skin powder is collected from the jujube skin powder outlet, and jujube pulp powder is collected from the jujube pulp powder outlet, thus obtaining peeled jujube powder.

[0067] The present invention also provides a peeled jujube powder prepared by the above preparation method.

[0068] This invention also provides an application of peeled jujube powder in the preparation of jujube compound 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 create a compound meal replacement powder, improving taste and increasing nutritional content.

[0069] Example 1

[0070] A method for preparing peeled jujube powder includes the following steps:

[0071] Step 1: Select high-quality red dates and soak them in the soaking solution for 45 minutes. The soaking solution includes 1.0% sodium alginate, 0.2% citric acid and water. Rinse with clean water and remove the pits.

[0072] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0073] Step 3: Using the peeled jujube powder pulverizing device of the present invention, the freeze-dried jujubes are fed into the inlet and fall into the second chamber. The motor is turned on to drive the rotating shaft to rotate the pulverizing blades and pulverize the freeze-dried jujubes. At the same time, the jujube pulp powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first and second chambers. The jujube skin powder is collected from the jujube skin powder outlet and the jujube pulp powder is collected from the jujube pulp powder outlet to obtain peeled jujube powder.

[0074] Example 2

[0075] A method for preparing peeled jujube powder includes the following steps:

[0076] Step 1: Select high-quality red dates and soak them in a soaking solution for 30 minutes. The soaking solution includes 0.8% sodium alginate, 0.1% citric acid and water. Rinse with clean water and remove the pits.

[0077] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0078] Step 3: Using the jujube powder pulverizing device described in this invention, the freeze-dried jujubes are fed into the second chamber through the inlet. The motor is turned on to drive the rotating shaft, which in turn rotates the pulverizing blades to pulverize the freeze-dried jujubes. Simultaneously, the jujube pulp powder scraper and the jujube peel powder scraper rotate with the rotating shaft, scraping the side walls of the first and second chambers. The jujube peel powder is collected through the jujube peel powder outlet, and the jujube pulp powder is collected through the jujube pulp powder outlet, thus obtaining peeled jujube powder. Example 3

[0079] A method for preparing peeled jujube powder includes the following steps:

[0080] Step 1: Select high-quality red dates and soak them in a soaking solution for 60 minutes. The soaking solution includes 1.2% sodium alginate, 0.3% citric acid and water. Rinse with clean water and remove the pits.

[0081] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0082] Step 3: Using the peeled jujube powder pulverizing device of the present invention, the freeze-dried jujubes are fed into the inlet and fall into the second chamber. The motor is turned on to drive the rotating shaft to rotate the pulverizing blades and pulverize the freeze-dried jujubes. At the same time, the jujube pulp powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first and second chambers. The jujube skin powder is collected from the jujube skin powder outlet and the jujube pulp powder is collected from the jujube pulp powder outlet to obtain peeled jujube powder.

[0083] Comparative Example

[0084] A method for preparing peeled jujube powder includes the following steps:

[0085] Step 1: Select high-quality red dates, rinse them with clean water, and remove the pits;

[0086] Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is controlled at 15 Pa to obtain freeze-dried red dates with a moisture content of less than 5%.

[0087] Step 3: Using the peeled jujube powder pulverizing device of the present invention, the freeze-dried jujubes are fed into the inlet and fall into the second chamber. The motor is turned on to drive the rotating shaft to rotate the pulverizing blades and pulverize the freeze-dried jujubes. At the same time, the jujube pulp powder scraper and the jujube skin powder scraper rotate with the rotating shaft to scrape the side walls of the first and second chambers. The jujube skin powder is collected from the jujube skin powder outlet and the jujube pulp powder is collected from the jujube pulp powder outlet to obtain peeled jujube powder.

[0088] Since the sugar content in jujube peel is very low while that in jujube flesh is very high, the difference in sugar content indicates the separation effect between jujube peel and jujube flesh. The peeled jujube powder and jujube peel powder obtained in Examples 1-3 and the comparative example were taken respectively, and their total sugar content was determined using the Fehling's reagent method. The results are shown in Table 1.

[0089] Table 1

[0090] 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

[0091] The results show that after soaking and freeze-drying jujubes using the method described in this invention, followed by pulverizing using the jujube powder pulverizing device described in this invention, the total sugar content in the material collected in the first chamber 101 is high, while the total sugar content in the material collected in the second chamber 102 is low. This proves that the jujube powder obtained in Examples 1-3 has a low jujube peel content, achieving good separation of jujube flesh and peel. In contrast, in the comparative example, directly freeze-drying and pulverizing jujubes resulted in a lower total sugar content in the material collected in the first chamber 101 compared to Examples 1-3, indicating a slightly higher jujube peel content. This is mainly because when jujubes are soaked in the soaking solution described in this invention, sodium alginate and citric acid can bind and penetrate the jujube peel, reducing the adhesion between the peel and flesh. After freeze-drying and pulverizing, the weight of the jujube peel powder increases, and under the influence of gravity, more of the jujube peel powder is retained in the second chamber, improving the separation effect between the jujube flesh and peel.

[0092] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for preparing peeled jujube powder, characterized in that, The method for preparing the peeled jujube powder is based on a peeled jujube powder pulverizing device, which includes: The cylinder has a first cavity and a second cavity that are connected to each other from top to bottom. The bottom of the first cavity is coaxially connected to an annular collection cavity. The collection cavity is coaxially arranged around the outer periphery of the second cavity. The two are separated by an annular partition. The top of the cylinder has a feed inlet. The bottom of the collection cavity has a jujube pulp powder outlet. The bottom of the second cavity has a jujube peel powder outlet. The crushing assembly includes a rotating shaft coaxially disposed within the cylinder, the bottom of the rotating shaft being rotatably connected to the bottom wall of the second cavity, the top of the rotating shaft rotating out of the cylinder and connected to a motor, and two crushing blades disposed on the outer periphery of the rotating shaft and accommodated within the second cavity. Both crushing blades are V-shaped and are arranged in a centrally symmetrical manner. The feed inlet is located near the rotating shaft. The jet assembly includes multiple first-stage jet nozzles located near the inlet of the first chamber, multiple second-stage jet nozzles located at the bottom of the second chamber, and multiple third-stage jet nozzles located near the jujube pulp powder outlet of the collection chamber and near the jujube peel powder outlet of the second chamber, respectively, and angled downward toward the outlet. Each jet nozzle is connected to the air storage tank via a metal bend, and a rotary ball valve is installed on each metal bend. The air storage tank is equipped with a manual pressure pump and a pressure gauge. The diameter of the first cavity is larger than the diameter 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; the outer periphery of the rotating shaft is also provided with two scraping components, each scraping component including a jujube pulp powder scraper, a connecting plate and a jujube peel powder scraper connected in sequence; The preparation method of the peeled jujube powder includes the following steps: Step 1: Select high-quality red dates and soak them in a soaking solution for 30-60 minutes. The soaking solution includes 0.8-1.2% sodium alginate, 0.1-0.3% citric acid and water. Rinse with clean water and remove the pits. Step 2: Place the pitted red dates in a -80℃ freezer for 12 hours, then transfer them to a vacuum freeze dryer and dry for 48 hours. The vacuum degree is 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 pulverizing device, the freeze-dried jujubes are fed into the inlet. Simultaneously, the rotary ball valve corresponding to the first jet nozzle is opened, releasing high-pressure gas from the storage tank. This gas is then conveyed through the metal bend and ejected from the first jet nozzle, ensuring the jujubes are evenly distributed and fall into the second chamber. The motor is then turned on, driving the rotating shaft to rotate the pulverizing blades and pulverize the freeze-dried jujubes. Simultaneously, the rotary ball valve corresponding to the second jet nozzle is opened, releasing high-pressure gas from the storage tank. This gas is then conveyed through the metal bend and ejected from the second jet nozzle. The jujube pulp powder scraper and jujube skin powder scraper rotate with the rotating shaft, scraping the side walls of the first and second chambers. After pulverization, the motor is turned off, and the rotary ball valve corresponding to the third jet nozzle is opened. High-pressure gas is released from the storage tank, conveyed through the metal bend and ejected from the third jet nozzle. The jujube skin powder is collected at the jujube skin powder outlet, and the jujube pulp powder is collected at the jujube pulp powder outlet, yielding peeled jujube powder.

2. The method for preparing peeled jujube powder as described in claim 1, characterized in that, The jujube pulp powder scraper has a U-shaped structure and is provided with a first scraper A, a first scraper B, and a first scraper C connected vertically in sequence. The connecting plate and the jujube peel powder scraper are both L-shaped structures. The connecting plate includes a connecting plate a and a connecting plate b connected vertically. The jujube peel powder scraper includes a second scraper A and a second scraper B connected vertically. The first scraper C is perpendicularly connected to the connecting plate a, and the connecting plate b is perpendicularly connected to the second scraper A. The first scraper B is close to the side wall 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, and the second scraper B is close to the bottom wall of the second cavity. The first scraper B, the first scraper C, the second scraper A, and the second scraper B are all provided with bristles.

3. The method for preparing peeled jujube powder as described in claim 2, characterized in that, The outer circumference of the rotating shaft is coaxially rotatably sleeved with a sleeve, the bottom of the rotating shaft extends beyond the bottom of the sleeve, two crushing blades are fixedly connected to the rotating shaft, and the first scraper A of the two scraping components is vertically fixedly connected to the sleeve.

4. The method for preparing peeled jujube powder as described in claim 3, characterized in that, The top of the cylinder is connected to a housing via multiple support rods. The motor is installed inside the housing. The sleeve rotates out of the cylinder and into the housing. The top of the rotating shaft extends beyond the top of the sleeve and is coaxially fixedly fitted with a first worm gear. Rotating rod A and rotating rod B are also installed inside the housing. Both ends of rotating rod A and rotating rod B are rotatably connected to the inner wall of the housing. Rotating rod A, rotating rod B, and rotating shaft are all perpendicular to each other. A first worm wheel and a second worm gear are coaxially fixedly fitted around the outer periphery of rotating rod A. A second worm wheel and a third worm gear are coaxially fixedly fitted around the outer periphery of rotating rod B. A third worm wheel is coaxially fixedly fitted around the outer periphery of the sleeve. The first worm gear meshes and rotates with the first worm wheel, the second worm gear and the second worm wheel, the third worm gear and the third worm wheel. The thread pitch of the first worm gear, the second worm gear and the third worm gear gradually decreases.

5. The method for preparing peeled jujube powder as described in claim 1, characterized in that, The cylinder has a double-walled structure, and the cavity between the two walls is filled with cooling liquid. The cylinder is provided with an inlet and an outlet that communicate with the cavity.

6. The method for preparing peeled jujube powder as described in claim 1, characterized in that, Each first-stage jet nozzle is set to a jet pressure of 0.3-0.5 MPa, each second-stage jet nozzle is set to a jet pressure of 0.2-0.3 MPa, and each third-stage jet nozzle is set to a jet pressure of 0.1-0.2 MPa.

7. The method for preparing peeled jujube powder as described in claim 1, characterized in that, There are four first-section jet nozzles arranged in a circular array on the inner wall of the first cavity near the feed inlet. The included angle between adjacent first-section jet nozzles is 90°. The whole is cylindrical with a constricted jet nozzle at the front end. Each first-section jet nozzle is fixed to the mounting hole on the inner wall of the first cavity by welding. The air inlet at the rear end of the first-section jet nozzle is connected to the metal bend pipe by thread. The second section has 6 nozzles arranged in a circular array at the bottom of the second cavity. The included angle between adjacent second nozzles is 60°. The overall shape is L-shaped with a bending radius of 20mm at the right angle bend. The front end is a constricted nozzle. The vertical part of the second nozzle is fixed to the mounting hole on the bottom of the second cavity by welding. The air inlet of the second nozzle is connected to the metal bend by thread. Two third-stage jet nozzles are arranged opposite each other in the collection chamber near the jujube pulp powder outlet, and two are also arranged opposite each other in the second chamber near the jujube peel powder outlet. The whole is in the shape of a bent tube with a bending angle of 45°, and it is inclined downward towards the outlet. The third-stage jet nozzles are fixed to the mounting holes opened on the side wall of the corresponding outlet by welding. The air inlet of the third-stage jet nozzle is connected to the metal bent tube by thread. The bending radius of the metal bend is not less than 3 times the pipe diameter, and multiple metal bends are connected to the gas storage tank by flanges. The diameter of the rotary ball valve is the same as that of the metal bend. The valve stem extends out of the valve housing and a rotary handle with scale markings is installed at the end of the valve stem. The rotation angle of the handle is 0-90°, corresponding to the closed and fully open states of the valve. The gas storage tank is designed to operate at a pressure of 1 MPa, with the working pressure controlled between 0.5 and 0.8 MPa. A manual pressure pump, pressure gauge, and safety valve are installed on the top of the gas storage tank. The maximum output pressure of the manual pressure pump is no less than 1.2 MPa. The manual pressure pump is connected to the gas storage tank via a high-pressure oil pipe with a pressure resistance of no less than 1.5 MPa. The pressure gauge has a range of 0 to 1 MPa. The safety valve is fitted with a spring-loaded safety valve with a set opening pressure of 0.85 MPa. When the pressure inside the gas storage tank exceeds the set value, the safety valve automatically opens to release pressure.

Images