Apocynum venetum original leaf steam explosion preprocessing system

Abstract

The utility model discloses an apocynum venetum original leaf steam explosion preprocessing system, which belongs to the technical field of apocynum venetum processing, and mainly comprises a preheating device and a steam explosion tank, by means of the preheating device, apocynum venetum original leaves can be preheated in advance so that fibers in the original leaves can be softened, the flexibility of the fibers is improved, and a good foundation is laid for follow-up steam explosion treatment; then more thorough and uniform impact crushing on the apocynum venetum original leaves can be realized by adopting mechanical kinetic energy of steam water molecules in the steam explosion treatment process; according to the utility model, by combining preheating and steam explosion, not only can the quality and characteristics of the fibers in the apocynum venetum raw leaves be effectively improved, but also the damage of the traditional mechanical crushing to the fibers in the apocynum venetum raw leaves can be avoided, and the energy consumption and time of steam explosion treatment can be reduced through preheating treatment; and therefore, the processing energy consumption of the whole steam explosion preprocessing system is reduced, and the processing efficiency and quality of the raw apocynum venetum leaves are improved.

Description

Technical Field

[0001] The utility model relates to the processing technology of Apocynum venetum, in particular to a steam explosion preprocessing system for Apocynum venetum raw leaves. Background Technique

[0002] Apocynum venetum, also known as Apocynum venetum tree, with the scientific name Apocynum venetum, belongs to a shrub or small tree of the genus Apocynum in the family Apocynaceae. This plant originated in Central Asia, especially in the Lop Nur area of the Tarim Basin, so it got the name "Apocynum venetum". Apocynum venetum is also distributed in the northwest and north China regions. Its leaves are rich in fibers, which can be used for papermaking and the textile industry. At the same time, its leaves can also be used as substitute tea, having medicinal and health care values.

[0003] Generally, for Apocynum venetum fibers, when they are used in the papermaking and textile industries, the raw leaves after pretreatment processes such as soaking and enzymatic hydrolysis are usually mechanically crushed or ground to further improve the softness and uniformity of the raw leaf fibers, making them more suitable for specific processing and application requirements. However, the processing methods of crushing and grinding not only have high costs such as energy consumption, but also easily damage the fibers in the raw leaves, affecting the quality and performance of the fibers.

[0004] After the Apocynum venetum raw leaves are processed by steam explosion in the utility model, the cellulose and hemicellulose in the Apocynum venetum leaves can be effectively softened, and the softness and processing performance of the fibers extracted therefrom subsequently meet the actual production needs of Apocynum venetum.

[0005] In view of this, the utility model designs a steam explosion preprocessing system for Apocynum venetum raw leaves. Summary of the Utility Model

[0006] The utility model provides a steam explosion preprocessing system for Apocynum venetum raw leaves. The steam explosion preprocessing system for Apocynum venetum raw leaves not only can effectively improve the quality and characteristics of the fibers in the Apocynum venetum raw leaves by combining preheating and steam explosion, but also can reduce the processing energy consumption of the system, solving the existing deficiencies.

[0007] The utility model provides a steam explosion preprocessing system for Apocynum venetum raw leaves, including:

[0008] Steam explosion tank, which is fixed by a frame, and is provided with a feed inlet, a steam inlet and a blasting outlet. A buffer tank is connected to the blasting outlet end of the steam explosion tank for buffering the raw apocynum venetum leaves after blasting treatment. At the same time, a preheating device is connected to the feed inlet end of the steam explosion tank, and the preheating device is used to preheat the raw apocynum venetum leaves. The preheating device includes a preheating tank, and a vacuum extraction pipeline and a hot gas transmission pipeline are provided on the preheating tank. Control valves are respectively provided on the vacuum extraction pipeline and the hot gas transmission pipeline, and a vacuum extraction mechanism is connected to the far end of the vacuum extraction pipeline, and a heating mechanism is connected to the far end of the hot gas transmission pipeline.

[0009] As a preferred solution of the present invention:

[0010] The heating mechanism is a steam heating mechanism or an air heating mechanism. When the heating mechanism is a steam heating mechanism, the preheating tank and the steam explosion tank share the same steam heating mechanism.

[0011] As a preferred solution of the present invention:

[0012] The preheating device further includes a bearing support and a driving mechanism. Both ends of the preheating tank are fixed on the bearing support and can rotate relative to the bearing support. The driving mechanism includes a servo motor and a transmission member, and the driving mechanism can drive the preheating tank to rotate reciprocally within a specified angle to achieve uniform preheating of the raw apocynum venetum leaves.

[0013] As a preferred solution of the present invention:

[0014] The transmission member is any one of a transmission belt or a transmission gear.

[0015] As a preferred solution of the present invention:

[0016] The outlet end of the buffer tank is connected with a vibration screening mechanism for screening the raw apocynum venetum leaves after blasting treatment. The vibration screening mechanism includes a vibration screening box installed on a bracket through a shock absorption mechanism. The vibration screening box sequentially includes a screening layer and a receiving layer from top to bottom, and an inlet for communicating with the screening layer is provided at one end of the vibration screening box, and outlets for communicating with the screening layer and the receiving layer are respectively provided on the other side of the vibration screening box.

[0017] As a preferred solution of the present invention:

[0018] The screening layer includes at least two layers. Among them, the mesh number of the screen on the upper screening layer is 60 mesh, and the mesh number of the screen on the lower screening layer is 80 mesh.

[0019] As a preferred solution of the present invention:

[0020] The feed inlet of the steam explosion tank is connected to the preheating tank through a lifting mechanism. The lifting mechanism includes a plurality of metering tipping buckets and a chain plate for driving the movement of the metering tipping buckets. The plurality of metering tipping buckets are equidistantly arranged on the chain plate.

[0021] As a preferred embodiment of the present invention:

[0022] A support plate is provided on the chain plate, and a gravity sensor is provided on the support plate. The metering tipping bucket is fixed on the support plate and the materials therein are metered through the gravity sensor.

[0023] Compared with the prior art, the advantages of the steam explosion preprocessing system for raw Apocynum venetum leaves in the present invention are as follows:

[0024] The present invention mainly includes a preheating device and a steam explosion tank. Among them, the preheating device adopts the method of vacuum preheating. Through this preheating device, the raw Apocynum venetum leaves can be preheated in advance to soften the fibers in the raw leaves, increase the flexibility of the fibers, and lay a good foundation for subsequent steam explosion treatment. Then, the mechanical kinetic energy of steam water molecules in the steam explosion treatment process can be used to more thoroughly and evenly impact and crush the components in the raw Apocynum venetum leaves. That is, by adopting the combination of preheating and steam explosion, the present invention can not only effectively improve the quality and characteristics of the fibers in the raw Apocynum venetum leaves, avoid the damage to the fibers in the raw Apocynum venetum leaves caused by traditional mechanical crushing, but also reduce the energy consumption and time of the steam explosion treatment through preheating treatment, thereby reducing the processing energy consumption of the entire steam explosion preprocessing system and improving the processing efficiency and quality of the raw Apocynum venetum leaves.

[0025] In addition, when the raw Apocynum venetum leaves are used for the production of Apocynum venetum substitute tea, the traditional production process of the existing Apocynum venetum substitute tea is generally as follows: The Apocynum venetum leaves that have undergone processes such as de-alkalization, qualified green killing, and rolling are generally finally dried (dried by baking or stir-frying) to form the finished Apocynum venetum substitute tea. The applicant of the present invention has found through research that the present invention can also be used for the actual production needs of Apocynum venetum substitute tea, that is, for the pretreatment of Apocynum venetum substitute tea. On the basis of the above current traditional production process of Apocynum venetum, before the raw Apocynum venetum leaves undergo the final drying process, the present invention's preheating and steam explosion methods are used to pretreat the raw Apocynum venetum leaves. After being brewed with boiling water into substitute tea, the Apocynum venetum leaves after preheating and steam explosion treatment can promote the further release of more health-beneficial components into the tea water, making the unique tea flavor of Apocynum venetum stronger, and also improving the brewing quality and health care effect of Apocynum venetum tea. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view structural schematic diagram of the steam explosion preprocessing system for raw Apocynum venetum leaves provided by an embodiment of the present invention.

[0027] Figure 2This is a top view structural schematic diagram of the vibration screening mechanism provided by the embodiment of the present utility model.

[0028] Figure 3 This is a side view structural schematic diagram of the bearing seat in the preheating device provided by the embodiment of the present utility model.

[0029] Reference numerals

[0030] Steam explosion tank 1, feed inlet 11, steam inlet 12, blasting outlet 13, preheating device 2, preheating tank 21, inlet 211, exhaust port 212, discharge port 213, bearing support seat 22, drive mechanism 23, vacuum extraction pipeline 24, hot gas delivery pipeline 25, support base 26, linkage shaft 27, buffer tank 3, vibration screening mechanism 4, frame 41, vibration screening box 42, sieve layer 43, receiving layer 44, feed inlet 45, discharge outlet 46, lifting mechanism 5, metering tipping bucket 51, support plate 52. Detailed implementation manners

[0031] The present utility model will be further described in detail below in conjunction with the detailed implementation manners and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present utility model.

[0032] In the description of the present utility model, it should be understood that the terms such as "upper end", "bottom", "upper", "lower", "outer side", "inner side", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or mechanism referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model; at the same time, in the description of the present utility model, the meaning of "at least" includes one, two and more than two.

[0033] In the present utility model, unless otherwise clearly defined and limited, terms such as "fixed", "connected", "installed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a relatively rotatable connection, or it can be an integral connection, a direct connection, or an indirect connection through an intermediate medium; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Embodiment 1: This embodiment provides a steam explosion preprocessing system for raw Apocynum venetum leaves, as Figure 1As shown, the preprocessing system includes a steam explosion tank 1, which is fixed by a frame 41, and the steam explosion tank 1 is provided with a feed inlet 11, a steam inlet 12 and a blasting outlet 13. It can be understood that the steam inlet 12 end should be connected with a steam heating mechanism through a steam delivery pipeline, and the steam heating mechanism can be used to fill the steam explosion tank 1 with steam at a specified temperature and pressure. In this embodiment, it is preferably that the temperature in the steam explosion tank 1 is controlled between 160°C and 180°C. The temperature in this range can effectively soften the fibers and hemicelluloses in the original apocynum leaves, and the pressure is preferably controlled between 0.2 MPa and 0.Between 0.5 MPa and 5 MPa, the air pressure within this range can not only achieve uniform heat transfer but also avoid damage or loss to the fiber structure caused by excessive pressure. The blasting outlet 13 of the steam explosion tank 1 is connected to a buffer tank 3 for buffering the raw apocynum leaves after blasting treatment. In this embodiment, for the convenience of discharging, it is preferred that the bottom of the buffer tank 3 is of a conical structure, thus avoiding the phenomenon of material accumulation in the buffer tank 3. At the same time, a preheating device 2 is connected to the feed inlet 11 of the steam explosion tank 1. The preheating device 2 includes a preheating tank 21, which is used to preheat the raw apocynum leaves after pretreatment such as soaking and enzymatic hydrolysis to improve the flexibility of the fibers in the raw apocynum leaves. In this embodiment, before preheating, the temperature in the preheating tank 21 is adjusted to a constant temperature between 40°C and 80°C, and during the preheating process, the preheating duration is controlled within 30 min - 120 min. A vacuum extraction pipeline 24 and a hot gas delivery pipeline 25 are provided on the preheating tank 21. Control valves are respectively provided on the vacuum extraction pipeline 24 and the hot gas delivery pipeline 25. And a vacuum extraction mechanism is connected to the distal end of the vacuum extraction pipeline 24, and a heating mechanism is connected to the distal end of the hot gas delivery pipeline 25. Through the cooperation of the vacuum extraction pipeline 24 and the vacuum extraction mechanism, a vacuum state can be formed inside the preheating tank 21. The vacuum environment not only has the advantage of high heat transfer efficiency, ensuring uniform heating of the raw apocynum leaves, but also can avoid the phenomena of oxidation and deterioration reactions that may occur to the raw apocynum leaves under normal pressure, ensuring the quality of the raw apocynum leaves during the preheating process. In this embodiment, an inlet 211 and a discharge port 213 should also be provided on the preheating tank 21. Among them, the inlet 211 is located at the top of the preheating tank 21 for receiving the pretreated raw apocynum leaves, and the discharge port 213 is located at the bottom of the preheating tank 21 for docking with the feed inlet 11 of the steam explosion tank 1. The heating mechanism connected to the distal end of the hot gas delivery pipeline 25 can specifically be a steam heating mechanism or an air heating mechanism. As the name implies, the steam heating mechanism preheats the raw apocynum leaves by outputting high-temperature steam, and the air heating mechanism preheats the raw apocynum leaves by outputting high-temperature air. In this embodiment, the former is preferably adopted, and the preheating tank 21 and the steam explosion tank 1 share the same steam heating mechanism. In this embodiment, since the temperatures used by the preheating tank 21 and the steam explosion tank 1 are different, when using the same steam heating mechanism for the first time, the initially lower temperature of the steam heating mechanism can be delivered to the preheating tank 21, and the later high temperature can be delivered to the steam explosion tank 1. When used again, the preheating tank 21 can utilize the steam released from the steam explosion tank 1 after the raw apocynum leaves in the steam explosion tank 1 have been processed by steam explosion, that is, the steam released from the steam explosion tank 1 after the steam explosion treatment of the raw apocynum leaves is recovered and used for heating the preheating tank 21, realizing the reuse of the steam explosion steam. In this way, not only the system cost is simplified and saved, but also the effective utilization of steam is facilitated. The above is a specific implementation manner of preferably sharing the same steam heating mechanism between the steam explosion tank 1 and the preheating tank 21 in this embodiment. Of course, it is also possible to choose to use the steam with a lower temperature in the early stage of the steam heating mechanism for the preheating tank 21 and the steam with a higher temperature in the later stage for the steam explosion tank 1.

[0035] In this embodiment, the preheating device 2 further includes a bearing support 22 and a driving mechanism 23. Both ends of the preheating tank 21 are fixed on the bearing support 22 and can rotate relative to the bearing support 22. That is, the preheating tank 21 is a rolling tank. The driving mechanism 23 includes a servo motor and a transmission member. The driving mechanism 23 can drive the preheating tank 21 to rotate reciprocally within a specified angle to achieve uniform preheating of the raw Apocynum leaves, as Figures 1-3 shown.

[0036] Specifically, linkage shafts 27 are provided at both ends of the preheating tank 21. The linkage shafts 27 pass through the bearing support 22 to fix the preheating tank 21 in a suspended manner. When necessary, a support base 26 can be provided at the bottom of the preheating tank 21. The curvature of the contact surface between the support base 26 and the preheating tank 21 is preferably the same as or close to that of the preheating tank 21, and the load on the linkage shafts 27 is reduced through the support base 26. The transmission member can be a transmission belt or a transmission gear. In this embodiment, it is preferably a transmission belt. The transmission belt is connected between the servo motor and the linkage shaft 27. By the forward and reverse rotation of the servo motor, the linkage shaft 27 can be driven to rotate reciprocally, and then the preheating tank 21 can be driven to rotate. It can be understood that the rotation angle of the preheating tank 21 should be set according to the actual situation to ensure that the Apocynum leaves can be uniformly heated, and at the same time, it is necessary to ensure that the normal use of each pipeline connected to the preheating tank 21 is not affected.

[0037] In this embodiment, due to the different installation heights of the steam explosion tank 1 and the preheating tank 21, precise docking cannot be achieved. Therefore, a lifting mechanism 5 is connected between the feed inlet 11 of the steam explosion tank 1 and the discharge port 213 of the preheating tank 21, as Figure 1 shown. The lifting mechanism 5 includes a plurality of metering tipping buckets 51 and a chain plate for driving the metering tipping buckets 51 to move. The plurality of metering tipping buckets 51 are arranged equidistantly on the chain plate.

[0038] During use, the preheated raw Apocynum leaf material falls into the metering tipping bucket 51 through the discharge port 213. The chain plate rotates to drive the metering tipping bucket 51 to lift the material (raw Apocynum leaves) towards the feed inlet 11 of the steam explosion tank 1. When reaching the position of the feed inlet 11, the metering tipping bucket 51 flips to pour the material into the feed inlet 11 to achieve the transportation of the material. It can be understood that in order to achieve intermittent feeding, a switching valve can be provided at the discharge port 213 end of the preheating tank 21, and the orderly feeding of the material into each metering tipping bucket 51 can be achieved by switching the switching valve.

[0039] In order to accurately control the amount of materials entering the steam explosion tank 1, a support plate 52 is provided on the chain plate, and a gravity sensor (not shown in the figure) is provided on the support plate 52. The metering tipping bucket 51 is fixed on the support plate 52 and the materials therein are metered through the gravity sensor. During use, the amount of materials entering the metering bucket is metered through the gravity sensor, so as to ensure that the amount of materials entering the steam explosion tank 1 reaches the optimal processing amount.

[0040] As a preferred embodiment of the present invention, a vibrating screening mechanism 4 is connected to the outlet end of the buffer tank 3 for screening the blasted raw apocynum venetum leaves to achieve the separation of the raw apocynum venetum leaves and impurities, facilitating subsequent further processing. The vibrating screening mechanism 4 includes a vibrating screening box 42 installed on a bracket through a shock absorption mechanism. The vibrating screening box 42 sequentially includes a screening layer 43 and a receiving layer 44 from top to bottom, and a feeding port 45 communicating with the screening layer 43 is provided at one end of the vibrating screening box 42, and discharging ports 46 communicating with the screening layer 43 and the receiving layer 44 respectively are provided on the other side of the vibrating screening box 42.

[0041] In order to screen the raw apocynum venetum leaves with different fiber particle sizes, preferably, the screening layer 43 includes at least two layers. Among them, the mesh number of the screen on the upper screening layer 43 is 60 meshes, and the mesh number of the screen on the lower screening layer 43 is 80 meshes, as Figure 2 shown.

[0042] During specific use, the materials from the buffer tank 3 enter the vibrating screening box 42 through the feeding port 45. With the vibration of the box body, the materials are separated into different layers according to the fiber size (particle size). Specifically, the impurities have the smallest particle size and are screened into the receiving layer 44, the raw apocynum venetum leaves with smaller fiber particle sizes are screened into the lower screening layer 43, and the raw apocynum venetum leaves with larger fiber particle sizes are retained on the upper screening layer 43, improving the screening efficiency and accuracy.

[0043] The specific use principle of this embodiment includes:

[0044] Pre-store a certain amount of raw apocynum leaves in the preheating tank 21 in advance, then process the inside of the preheating tank 21 into a vacuum state through a vacuum system, and convey steam into the preheating tank 21. The steam temperature is controlled at 40°C - 80°C, and the air pressure can be normal pressure or slightly higher than normal pressure. Use this steam to preheat the raw apocynum leaves for about 60 minutes. During the preheating process, the preheating tank 21 can be intermittently or continuously rotated by about 30° by a servo motor to stir the raw apocynum leaves in the preheating tank 21 to ensure uniform heating. Through preheating, the cellulose and hemicellulose in the raw apocynum leaves can be softened, laying a foundation for subsequent steam explosion treatment; after the preheating is completed, the raw apocynum leaf material is conveyed to the steam explosion tank 1 through the lifting mechanism 5, and steam is conveyed into the steam explosion tank 1, with the temperature controlled between 160°C - 180°C, and maintained at a pressure of 0.3 MPa for about 4 - 7 minutes. This process can further soften the fibers and hemicellulose in the raw apocynum leaves, increase their flexibility, and achieve physical modification of the raw apocynum leaves. When the steam explosion tank 1 suddenly releases pressure and sprays, its volume surges, and under the action of the steam mechanical force, the fibers in the raw apocynum leaves can be completely and evenly torn into small fibers, meeting the requirements for subsequent papermaking and textile processing; the raw apocynum leaves after steam explosion treatment contain impurities and fibers of different particle sizes. For the convenience of subsequent processing, the raw apocynum leaves enter the vibrating screening mechanism 4 through the buffer tank 3, and the vibrating screening mechanism 4 screens the raw apocynum leaves after steam explosion treatment, and conveys the screened materials to the designated positions through different discharge ports 46.

[0045] From the above analysis, it can be seen that in this embodiment, by adopting the combination of preheating and steam explosion, not only can the quality and characteristics of the fibers in the raw apocynum leaves be effectively improved, avoiding damage to the fibers in the raw apocynum leaves caused by traditional mechanical crushing, but also the energy consumption and time of the steam explosion treatment can be reduced through the preheating treatment, thereby reducing the processing energy consumption of the entire steam explosion preprocessing system and improving the processing efficiency and quality of the raw apocynum leaves.

[0046] The above are only embodiments of the present invention, and common knowledge such as specific structures and characteristics known in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the premise of the present invention, several improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by the present invention should be based on the content of the claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A steam explosion pre - processing system for raw Apocynum venetum leaves, characterized in that: It includes a steam explosion tank, which is fixed by a frame (41). The steam explosion tank (1) is provided with a feed inlet (11), a steam inlet (12) and a blasting outlet (13). The blasting outlet (13) end of the steam explosion tank (1) is connected to a buffer tank (3) for buffering the raw Apocynum venetum leaves after blasting treatment. At the same time, a pre - heating device (2) is connected to the feed inlet (11) end of the steam explosion tank (1). The pre - heating device (2) is used to pre - heat the raw Apocynum venetum leaves. The pre - heating device (2) includes a pre - heating tank (21). The pre - heating tank (21) is provided with a vacuum pumping pipeline (24) and a hot gas delivery pipeline (25). Control valves are respectively provided on the vacuum pumping pipeline (24) and the hot gas delivery pipeline (25). A vacuum pumping mechanism is connected to the far end of the vacuum pumping pipeline (24), and a heating mechanism is connected to the far end of the hot gas delivery pipeline (25).

2. The steam explosion pre - processing system for raw Apocynum venetum leaves according to claim 1, characterized in that: The heating mechanism is a steam heating mechanism or an air heating mechanism. When the heating mechanism is a steam heating mechanism, the pre - heating tank (21) and the steam explosion tank (1) share the same steam heating mechanism.

3. The steam explosion pre - processing system for raw Apocynum venetum leaves according to claim 1, characterized in that: The pre - heating device (2) further includes a bearing support (22) and a driving mechanism (23). Both ends of the pre - heating tank (21) are fixed on the bearing support (22) and can rotate relative to the bearing support (22). The driving mechanism (23) includes a servo motor and a transmission part. The driving mechanism (23) can drive the pre - heating tank (21) to rotate reciprocally within a specified angle through the transmission part to achieve uniform pre - heating of the raw Apocynum venetum leaves.

4. The steam explosion pre - processing system for raw Apocynum venetum leaves according to claim 3, characterized in that: The transmission part is any one of a transmission belt or a transmission gear.

5. The steam explosion pre - processing system for raw Apocynum venetum leaves according to claim 1, characterized in that: The outlet end of the buffer tank (3) is connected to a vibrating screening mechanism (4) for screening the raw Apocynum venetum leaves after blasting treatment. The vibrating screening mechanism (4) includes a vibrating screening box (42) installed on a bracket through a shock - absorbing mechanism. The vibrating screening box (42) sequentially includes a screening layer (43) and a receiving layer (44) from top to bottom. An inlet (45) communicating with the screening layer (43) is provided at one end of the vibrating screening box (42), and outlets (46) respectively communicating with the screening layer (43) and the receiving layer (44) are provided on the other side of the vibrating screening box (42).

6. The steam explosion pre - processing system for raw Apocynum venetum leaves according to claim 5, characterized in that: The screening layer (43) includes at least two layers. Among them, the mesh number of the screen on the upper - layer screening layer (43) is 60 meshes, and the mesh number of the screen on the lower - layer screening layer (43) is 80 meshes.

7. The steam explosion preprocessing system for raw apocynum venetum leaves according to claim 1, wherein: The feed inlet (11) of the steam explosion tank (1) is communicated with the preheating tank (21) through a lifting mechanism (5), and the lifting mechanism (5) includes a plurality of metering tipping buckets (51) and a chain plate for driving the movement of the metering tipping buckets (51), and the plurality of metering tipping buckets (51) are arranged on the chain plate at equal intervals.

8. The steam explosion preprocessing system for raw apocynum venetum leaves according to claim 7, wherein: A support plate (52) is provided on the chain plate, and a gravity sensor is provided on the support plate (52). The metering tipping bucket (51) is fixed on the support plate (52) and the materials therein are metered through the gravity sensor.

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