Movable alfalfa whole bundle drying equipment, drying system and drying method

Abstract

The invention discloses a movable whole alfalfa bundle drying device, system and method, and belongs to the technical field of alfalfa processing.The device comprises a lifting device used for driving to-be-dried alfalfa bundles to move up and down; the negative pressure moisture absorption device is arranged on the lifting device and is used for carrying out moisture absorption treatment on the whole bundle of alfalfa; the drying device comprises an air guide cover, a hot air input pipe and a hot air chamber, and the hot air chamber corresponds to the lifting device; a plurality of hot distribution needle tubes are arranged at the lower end of the hot air chamber, and a plurality of air outlet holes are formed in the hot distribution needle tubes; the top of the hot air chamber is connected with an air guide cover which is connected with a hot air input pipe. The straw bales move up and down to realize insertion and extraction of the thermal separation needle tubes into and out of the straw bales, so that the reliability of a hot air system is remarkably improved; a negative pressure moisture absorption device is additionally arranged, heat in the bales is discharged in time, water in the bales can be further taken away, the drying time of the whole bales is shortened, and drying energy consumption is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of alfalfa processing, and particularly relates to a mobile alfalfa bale drying device, a drying system and a drying method. Background Art

[0002] Alfalfa hay is an important guarantee for high-yield and high-quality dairy cows. There are problems in the traditional alfalfa modulation process in China, such as long field drying time, large losses during machine operation, and a large amount of alfalfa that turns yellow in the sun and gets rained on, which directly leads to a low grade of domestic alfalfa. Implementing wet alfalfa baling and alfalfa bale drying is the core modulation technology to reduce field losses and improve alfalfa quality. In recent years, the array needle tube type forage bale drying equipment has developed rapidly abroad, and a series of fixed and vehicle-mounted large square bale alfalfa drying equipment has been formed.

[0003] At present, the array needle tube type forage bale drying equipment uses hot needle tubes to move downward and insert into the bales. During the drying process, the hot air input pipe, the air collecting hood and the hot air chamber all move up and down with the hot needle tubes. Therefore, high requirements are imposed on the pipeline fixing, sealing and durability, and relatively high requirements are also put forward for the manufacturing and assembly technology of the hot needle tubes; in addition, the existing array needle tube type forage bale drying equipment continuously inputs hot air to take away the moisture of the bales, and the internal heat of the bales is relatively large after drying, and subsequent storage still requires a long time of natural cooling. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A mobile alfalfa bale drying device includes:

[0006] A lifting device for driving the alfalfa bales to be dried to move up and down;

[0007] A negative pressure moisture absorption device, which is arranged on the lifting device and is used for moisture absorption treatment of the whole alfalfa bales;

[0008] A drying device, the drying device includes an air guide hood, a hot air input pipe and a hot air chamber, and the hot air chamber is correspondingly arranged with the lifting device; a plurality of hot needle tubes are arranged at the lower end of the hot air chamber, and a plurality of air outlet holes are arranged on the hot needle tubes; the top of the hot air chamber is connected with the air guide hood, and the air guide hood is connected with the hot air input pipe; the hot air input pipe conveys hot air into the hot air chamber, and the hot air chamber then conveys the hot air to the hot needle tubes to dry the bales;

[0009] Wherein, when drying is required, the lifting device drives the alfalfa bales to be dried to approach the drying device until the air outlet holes on the hot needle tubes are completely immersed in the bales and then stops moving; after drying is completed, the lifting device drives the alfalfa bales to separate from the hot needle tubes.

[0010] Further, it further includes a housing, a bellows support frame, and a bellows fixing frame that are connected and arranged in sequence from bottom to top. The lifting device is installed inside the housing, and the hot air chamber is installed on the bellows fixing frame.

[0011] Further, the lifting device is a screw-type scissor lift, and the negative pressure moisture absorption device is arranged on the platform of the screw-type scissor lift.

[0012] Further, the negative pressure moisture absorption device includes:

[0013] An I-beam support, which is arranged at the upper end of the platform of the screw-type scissor lift;

[0014] A plurality of negative pressure air guide boxes, which are arranged at the upper end of the platform of the screw-type scissor lift; a negative pressure moisture absorption port is provided at the bottom of the negative pressure air guide box, and the negative pressure moisture absorption port is connected to the negative pressure pipeline of the factory or to a mobile integrated vacuum pump; the negative pressure air guide box is at the same height as the I-beam support;

[0015] A bearing platform, which is arranged at the upper ends of the I-beam support and the plurality of negative pressure air guide boxes. A plurality of rows of grooves are provided at the lower end of the bearing platform. One negative pressure air guide box is correspondingly arranged below every two rows of the grooves. A sealed structure is formed between the negative pressure air guide box and the bearing platform; a plurality of moisture absorption holes are arranged in each row of the grooves; the bearing platform is used for bearing bales of hay.

[0016] Further, a plurality of the hot needle tubes are evenly distributed at the lower end of the hot air chamber; the positions of the air outlet holes of two adjacent hot needle tubes are arranged staggeredly.

[0017] Further, the hot needle tube is a quick-install needle tube with a flared opening and a conical surface air outlet needle head.

[0018] A mobile alfalfa bale drying system includes a trailer and a mobile alfalfa bale drying equipment group arranged on the trailer. The mobile alfalfa bale drying equipment group includes N symmetrically arranged mobile alfalfa bale drying equipments as described in any one of the above.

[0019] Further, it further includes a main pipeline arranged at the upper end of the mobile alfalfa bale drying equipment group. The hot air input pipes of N mobile alfalfa bale drying equipments are communicated with the main pipeline through connecting pipelines. One end of the main pipeline is connected to a heat source pipeline, and the other end is a sealed end of the main pipeline.

[0020] A mobile alfalfa bale drying method is the drying method of the mobile alfalfa bale drying system as described in any one of the above. The drying method includes the following steps:

[0021] S10. Equipment Deployment: Move the trailer equipped with the drying equipment group to the working site with heat source supply, establish a detachable connection between the input end of the main pipeline and the external heat source pipeline, and at the same time selectively connect the negative pressure moisture absorption port to the factory negative pressure pipe network or the mobile vacuum pump device;

[0022] S20. Bale Loading: Use material handling equipment to position and place the alfalfa bales on the loading platform of the negative pressure moisture absorption device;

[0023] S30. Lifting and Positioning: Start the lifting device to lift the bale, so that the hot needle tubes are evenly inserted along the axial direction of the bale, and stop lifting until the air outlet holes on the hot needle tubes are completely immersed in the bale;

[0024] S40. Cooperative Drying: Turn on the hot air supply system of the main pipeline, and simultaneously start the negative pressure moisture absorption device to maintain a vacuum degree of -10 to -25 kPa. The dried hot air is guided into the negative pressure air guide box through the moisture absorption holes arranged on the loading platform, and then the hot air is drawn out of the equipment through the negative pressure pipeline installed on the negative pressure moisture absorption port at the bottom of the negative pressure air guide box, forming a directional drying air flow from the core to the bottom;

[0025] S50. Operation Cycle: After the drying cycle ends, the lifting device drives the bale to descend to the initial working position, and the dried bale is removed by the material handling equipment;

[0026] S60. Equipment Group Scheduling: According to the number N of material handling equipment, N≥1, divide the drying equipment on the trailer into N working units, and each unit independently executes the S20 - S50 processes.

[0027] Beneficial Effects:

[0028] In the present invention, the hot needle tubes are inserted into and pulled out of the bale by moving the bale up and down, significantly improving the reliability of the hot air system; adding a negative pressure moisture absorption device can timely discharge the heat in the bale and further remove the moisture in the bale, which is beneficial to reducing the whole bale drying time and reducing the drying energy consumption.

[0029] The present invention further improves the reliability and economy of the array needle tube type forage whole bale drying equipment, which is beneficial to promoting the popularization and application of the array needle tube type forage whole bale drying equipment. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the overall structure of a mobile alfalfa whole bale drying system provided by the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of a mobile alfalfa whole bale drying equipment provided by the present invention;

[0032] Figure 3Schematic structural diagram of the negative pressure moisture absorption device in a mobile alfalfa bale drying equipment provided by the present invention;

[0033] Figure 4 Another perspective structural diagram of the negative pressure moisture absorption device in a mobile alfalfa bale drying equipment provided by the present invention;

[0034] Figure 5 Schematic structural diagram of the arrangement of heat needle tubes in a mobile alfalfa bale drying equipment provided by the present invention;

[0035] Figure 6 Another perspective schematic diagram of the arrangement of heat needle tubes in a mobile alfalfa bale drying equipment provided by the present invention.

[0036] In the figure: 1. Screw - type scissor lift; 2. Negative pressure moisture absorption device; 2 - 1. I - beam support; 2 - 2 Negative pressure air guide box; 2 - 3. Moisture absorption holes; 2 - 4. Loading platform; 2 - 5. Negative pressure moisture absorption port; 3. Heat needle tube; 4. Hot air chamber; 5. Air guide hood; 6. Hot air input pipe; 7. Air box fixing frame; 8. Air box support frame; 9. Outer shell; 10. Lift motor; 11. Screw rod; 12. Trailer; 13. Main pipeline; 14 Main pipeline sealing end. Detailed implementation manners

[0037] Embodiment 1

[0038] Refer to Figure 2 - Figure 6 , a mobile alfalfa bale drying equipment, comprising:

[0039] A lifting device for driving the alfalfa bales to be dried to move up and down;

[0040] A negative pressure moisture absorption device 2, the negative pressure moisture absorption device 2 is arranged on the lifting device and is used for moisture absorption treatment of the whole alfalfa bales;

[0041] A drying device, the drying device includes an air guide hood 5, a hot air input pipe 6 and a hot air chamber 4, the hot air chamber 4 is arranged corresponding to the lifting device; a plurality of heat needle tubes are arranged at the lower end of the hot air chamber 4, and a plurality of air outlet holes are arranged on the heat needle tubes; the top of the hot air chamber 4 is connected to the air guide hood 5, and the air guide hood 5 is connected to the hot air input pipe 6; the hot air input pipe 6 conveys hot air into the hot air chamber 4, and the hot air chamber 4 then conveys the hot air to the heat needle tubes 3 to dry the bales;

[0042] Among them, when drying is required, the lifting device drives the alfalfa bales to be dried close to the drying device until the air outlet holes on the heat needle tubes 3 are completely immersed in the bales and then stops moving; after drying is completed, the lifting device drives the alfalfa bales away from the heat needle tubes 3.

[0043] The mobile alfalfa bale drying equipment provided in this embodiment further includes a housing 9, a bellows support frame 8, and a bellows fixing frame 7 that are sequentially connected and arranged from bottom to top. The lifting device is installed inside the housing 9, and the hot air chamber 4 is installed on the bellows fixing frame 7.

[0044] In this embodiment, the lifting device is a screw-type scissor lift 1, and the negative pressure moisture absorption device 2 is arranged on the platform of the screw-type scissor lift 1.

[0045] Preferably, the screw-type scissor lift is selected with a platform size of 2.0m * 1.5m, which can perfectly adapt to the size of the alfalfa bale (1.8m * 1.2m * 0.8m), providing sufficient placement space for the bale and the drying device to avoid equipment congestion or instability. Among them, the lifting height of the lift is 1.5 meters, meeting the requirements of the drying operation and being able to adapt to the working environment and height requirements of the alfalfa bale drying equipment. Since the bale is generally about 260kg, a lift with a load capacity of 400kg is selected, which can easily handle the weight requirements of the alfalfa bale and the drying equipment, ensuring that the screw-type scissor lift will not be unstable or damaged during the lifting process. The lift motor 10 is selected as a 2.2kW three-phase motor, and the specification of the screw 11 is selected as a Tr30×6 trapezoidal thread screw with a diameter of 28mm; in addition, the screw-type scissor lift also needs to adopt an anti-corrosion coating to improve durability, which is especially suitable for long-term use in high-intensity working scenarios such as alfalfa bale drying.

[0046] In this embodiment, a plurality of hot needle tubes are evenly distributed at the lower end of the hot air chamber 4; the air outlet holes of two adjacent hot needle tubes 3 are arranged in a staggered manner.

[0047] In this embodiment, the hot needle tube 3 is a quick-installation needle tube with a flared and conical air outlet needle head.

[0048] In this embodiment, the hot needle tube 3 is used to evenly distribute hot air to improve the drying efficiency.

[0049] Preferably, the hot needle tube 3 is selected as a quick-installation needle tube with a flared and conical air outlet needle head, with an inner diameter of 28mm and an outer diameter of 30mm. Each hot needle tube is provided with 4 rows, 5 in each row, air outlet holes with a diameter of 6mm, and the air outlet holes of two adjacent hot needle tubes are arranged in a staggered manner. There are 5 rows of hot needle tubes installed at the bottom of the hot air chamber 5, with 12 in each row. Among them, the flared and conical design can make the hot air evenly distributed, ensuring that the alfalfa bale is evenly dried, thereby improving the drying efficiency.

[0050] In this embodiment, the negative pressure moisture absorption device 2 includes:

[0051] I-beam supports 2-1, and the I-beam supports 2-1 are arranged at the upper end of the platform of the screw-type scissor lift 1;

[0052] Multiple negative pressure air guide boxes 2-2 are arranged at the upper end of the platform of the screw-type scissor lift 1; a negative pressure moisture absorption port 2-5 is provided at the bottom of the negative pressure air guide box 2-2, and the negative pressure moisture absorption port 2-5 is connected to the negative pressure pipeline of the factory or to a mobile integrated vacuum pump; the negative pressure air guide box 2-2 is at the same height as the I-beam support 2-1;

[0053] A bearing platform 2-4 is arranged at the upper ends of the I-beam support 2-1 and multiple negative pressure air guide boxes 2-2. Multiple rows of grooves are provided at the lower end of the bearing platform 2-4. A negative pressure air guide box 2-2 is correspondingly arranged below every two rows of grooves, and a sealed structure is formed between the negative pressure air guide box 2-2 and the bearing platform 2-4; multiple moisture absorption holes 2-3 are arranged in each row of grooves; the bearing platform 2-4 is used for bearing bales of hay.

[0054] In this embodiment, the negative pressure moisture absorption device 2 works in cooperation with the drying device to enhance the drying effect of the whole alfalfa bales.

[0055] Preferably, the bearing platform 2-4 is supported by the I-beam and the negative pressure air guide box together and has sufficient strength to adapt to the weight of the bales of hay. 8 rows of grooves are provided on the bearing platform 2-4, 6 moisture absorption holes 2-3 are provided in each row of grooves, and the diameter of each moisture absorption hole 2-3 is 10 mm. A negative pressure air guide box 2-2 is provided below every two rows of grooves, and a seal is formed between the negative pressure air guide box 2-2 and the bearing platform 2-4. A negative pressure moisture absorption port 2-5 is provided at the bottom of the negative pressure air guide box 2-2, and the negative pressure moisture absorption port 2-5 can be connected to the negative pressure pipeline of the factory or connected to a mobile integrated vacuum pump to achieve the negative pressure moisture absorption function.

[0056] Specifically, there are 4 negative pressure air guide boxes 2-2 and 2 I-beam supports 2-1. The 4 negative pressure air guide boxes 2-2 are arranged at intervals between the 2 I-beam supports 2-1 and support the bearing platform 2-4 together.

[0057] The mobile alfalfa whole bale drying equipment provided by this embodiment can effectively remove the moisture in the whole alfalfa bales during the drying process by adopting the combination of the negative pressure moisture absorption device and hot air drying, and ensure the uniformity of the drying effect. Especially the design of the hot air needle tubes enables the hot air to be evenly distributed in the hot air chamber, avoiding the uneven distribution of hot air in the traditional drying equipment, thereby improving the drying efficiency and drying quality.

[0058] Through the setting of the lifting device, the height of the equipment can be adjusted according to needs to ensure that the whole alfalfa bales during the drying process can evenly contact the hot air and further improve the drying efficiency. Compared with the prior art, the present invention can better control each link in the drying process and avoid the problem of uneven drying of the whole alfalfa bales caused by different positions during the drying process.

[0059] By the collaborative operation of the negative pressure moisture absorption device and the drying device, the need for manual intervention can be reduced, the automation level can be improved, and the labor cost can be lowered. In addition, the design of the lifting device facilitates the quick and precise operation of the whole bales of alfalfa, reduces the manual operation time of the equipment, and further improves the work efficiency.

[0060] Example 2

[0061] Reference Figure 1 , a mobile whole bale alfalfa drying system, including a trailer 12 and a set of mobile whole bale alfalfa drying equipment arranged on the trailer 12. The set of mobile whole bale alfalfa drying equipment includes N symmetrically arranged mobile whole bale alfalfa drying equipment provided in Example 1.

[0062] The mobile whole bale alfalfa drying system provided in this embodiment further includes a main pipeline 13 arranged at the upper end of the set of mobile whole bale alfalfa drying equipment. The hot air input pipes 6 of the N mobile whole bale alfalfa drying equipment are communicated with the main pipeline 13 through connecting pipelines. One end of the main pipeline 13 is connected to a heat source pipeline, and the other end is a sealed end 14 of the main pipeline.

[0063] In this embodiment, each whole bale alfalfa drying equipment can be arranged on the trailer 12. Each trailer 12 can be installed with 8 drying equipment. The 8 drying equipment are arranged in two rows symmetrically, with 4 in each row.

[0064] Preferably, the length of the trailer 12 is selected as 9m and the width is 3.5m. The trailer 12 can provide enough space to avoid congestion between equipment, improve work efficiency and operation safety.

[0065] Among them, the 8 drying equipment are connected to the main pipeline 13 through pipelines. One end of the main pipeline 13 is connected to a heat source pipeline, and the other end is a sealed end 14 of the main pipeline.

[0066] Preferably, the main pipeline 13 is made of 316L stainless steel and is coated with an aerogel thermal insulation layer on the outer part of the pipeline (resistant to 600°C high temperature, heat loss < 4%). The hot air input pipe 6 is made of 304 stainless steel corrugated pipe (with quick-connect flanges, easy to disassemble and assemble).

[0067] Through the connection of the main pipeline and the hot air input pipe, a centralized hot air supply system is formed, which can efficiently transport hot air to multiple hot air chambers, optimize the utilization rate of hot air, and reduce energy waste. Compared with the existing equipment, this centralized hot air supply method greatly reduces energy consumption and improves the energy efficiency of the drying process.

[0068] Since the drying equipment can be installed on a trailer, with 8 sets of equipment installable on each trailer and the equipment arranged symmetrically, it is convenient for the centralized transportation and installation of multiple sets of equipment. Compared with the traditional drying equipment with fixed installation, the trailer design makes the equipment more flexible, capable of adapting to the needs of different workplaces, achieving rapid deployment, and enhancing the flexibility and mobility of operations.

[0069] Since each trailer can carry 8 sets of drying equipment and multiple sets of equipment operate centrally through a pipeline system, the present invention can achieve large-scale continuous operation, significantly improving the overall production efficiency of alfalfa drying, meeting the requirements of large-scale alfalfa drying operations, and achieving a substantial efficiency improvement compared with the existing single-machine operation mode.

[0070] Example 3

[0071] A mobile alfalfa bale drying method, which is the drying method of the mobile alfalfa bale drying system provided in Example 2. The drying method includes the following steps:

[0072] S10. Equipment deployment: Move the trailer 12 carrying the drying equipment group to the working site with heat source supply, establish a detachable connection between the input end of the main pipeline 13 and the external heat source pipeline, and at the same time selectively connect the negative pressure moisture absorption port 2-5 to the factory negative pressure pipe network or the mobile vacuum pump device;

[0073] S20. Bale loading: Use material handling equipment to position and place the alfalfa bales on the loading platform 2-5 of the negative pressure moisture absorption device 2;

[0074] S30. Lifting and positioning: Start the lifting device to lift the bales, so that the hot needle tubes 3 are evenly inserted along the axial direction of the bales, and stop lifting until the air outlet holes on the hot needle tubes 3 are completely immersed in the bales;

[0075] Specifically, start the screw-type scissor lift 1 to lift the bales, so that the hot needle tubes 3 are evenly inserted along the axial direction of the bales, and stop lifting until the air outlet holes on the hot needle tubes 3 are completely immersed in the bales;

[0076] S40. Cooperative drying: Turn on the main pipeline hot air supply system, synchronously start the negative pressure moisture absorption device to maintain a vacuum degree of -10 to -25 kPa. The dried hot air is guided into the negative pressure air guide box through the moisture absorption holes provided on the loading platform, and then the hot air is extracted from the equipment through the negative pressure pipeline installed on the negative pressure moisture absorption port at the bottom of the negative pressure air guide box, forming a directional drying air flow from the core to the bottom;

[0077] Specifically, turn on the hot air supply system of the main pipeline 13. The hot air needle tube 3 conveys hot air at a flow rate of 0.5 - 1.2 m / s at a temperature of 60 - 120 °C. Simultaneously start the negative pressure moisture absorption device 2 to maintain a vacuum degree of -10 to -25 kPa. The dried hot air is guided into the negative pressure air guide box 2-2 through the moisture absorption holes 2-3 provided on the bearing platform 2-4. Subsequently, the hot air is extracted from the device through the negative pressure pipeline installed on the negative pressure moisture absorption port 2-5 at the bottom of the negative pressure air guide box 2-2, forming a directional drying air flow from the core downwards;

[0078] S50, Operation cycle: After the drying cycle ends, the lifting device drives the bale to descend to the initial station, and the dried bale is removed by the material handling equipment;

[0079] S60, Equipment group scheduling: According to the number N (N≥1) of material handling equipment, divide the drying equipment on the trailer into N operating units, and each operating unit contains 8 / N sets of equipment; each unit independently executes the processes of S20 - S50.

[0080] As described above, it is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A mobile alfalfa bale drying device, characterized in that: include: A lifting device, used to drive the alfalfa bale to be dried to move up and down; A negative pressure moisture absorption device, which is arranged on the lifting device and is used for absorbing moisture from the whole bale of alfalfa; A drying device, the drying device comprising an air guide hood, a hot air input pipe and a hot air chamber, the hot air chamber being arranged corresponding to the lifting device; a plurality of hot needle tubes are arranged at the lower end of the hot air chamber, and a plurality of air outlet holes are arranged on the hot needle tubes; the top of the hot air chamber is connected to the air guide hood, and the air guide hood is connected to the hot air input pipe; the hot air input pipe transports hot air into the hot air chamber, and the hot air chamber then transports hot air to the hot needle tubes to dry the straw bales; When drying is required, the lifting device drives the alfalfa bale to be dried close to the drying device until the air outlet holes on the hot needle tube are completely immersed in the bale and then stops moving; after drying is completed, the lifting device drives the alfalfa bale to separate from the hot needle tube.

2. The mobile alfalfa bale drying equipment according to claim 1, characterized in that: It also includes a shell, a bellows support frame and a bellows fixing frame which are sequentially connected from bottom to top. The lifting device is installed in the shell, and the hot air chamber is installed on the bellows fixing frame.

3. The mobile alfalfa bale drying equipment according to claim 1, characterized in that: The lifting device is a screw-type scissor lift, and the negative pressure moisture absorption device is arranged on the platform of the screw-type scissor lift.

4. The mobile alfalfa bale drying equipment according to claim 3 is characterized in that: The negative pressure moisture absorption device comprises: An I-beam support, the I-beam support being arranged at the upper end of the platform of the screw-type scissor lift; A plurality of negative pressure air guide boxes, wherein the plurality of negative pressure air guide boxes are arranged at the upper end of the platform of the screw-type scissor lift; a negative pressure moisture absorption port is provided at the bottom of the negative pressure air guide box, and the negative pressure moisture absorption port is connected to the negative pressure pipeline of the factory or to the mobile integrated vacuum pump; the negative pressure air guide box is at the same height as the I-beam support; A load-bearing platform, wherein the load-bearing platform is arranged at the upper end of the I-beam support and the plurality of negative pressure air guide boxes, and a plurality of rows of grooves are arranged at the lower end of the load-bearing platform, a negative pressure air guide box is arranged correspondingly below every two rows of grooves, and a sealing structure is formed between the negative pressure air guide box and the load-bearing platform; a plurality of moisture absorption holes are arranged in each row of the grooves; and the load-bearing platform is used for carrying bales of straw.

5. The mobile alfalfa bale drying equipment according to claim 1, characterized in that: The plurality of heat dividing needle tubes are evenly distributed at the lower end of the hot air chamber; the air outlets of two adjacent heat dividing needle tubes are arranged in a staggered manner.

6. The mobile alfalfa bale drying equipment according to claim 5, characterized in that: The heat distribution needle tube is a quick-install needle tube with a flared mouth and a conical air outlet needle head.

7. A mobile alfalfa bale drying system, characterized in that: The invention comprises a trailer and a mobile alfalfa bale drying equipment group arranged on the trailer, wherein the mobile alfalfa bale drying equipment group comprises N symmetrically arranged mobile alfalfa bale drying equipments according to any one of claims 1 to 6.

8. The mobile alfalfa bale drying system according to claim 7, characterized in that: It also includes a main pipeline arranged at the upper end of the mobile alfalfa bale drying equipment group, and the hot air input pipes of N mobile alfalfa bale drying equipment are connected to the main pipeline through connecting pipes, one end of the main pipeline is connected to the heat source pipeline, and the other end is the sealing end of the main pipeline.

9. A mobile alfalfa bale drying method, characterized in that: The drying method of the mobile alfalfa bale drying system according to any one of claims 7 to 8 comprises the following steps: S10, equipment deployment: Move the trailer carrying the drying equipment group to the work site with heat source supply, establish a detachable connection between the input end of the main pipeline and the external heat source pipeline, and selectively connect the negative pressure moisture absorption port to the factory negative pressure pipe network or a mobile vacuum pump device; S20, bale loading: use material handling equipment to position the alfalfa bale on the carrying platform of the negative pressure moisture absorption device; S30, lifting and positioning: starting the lifting device to lift the straw bale, so that the heat distribution needle tube is evenly inserted along the axial direction of the straw bale, and the lifting and lowering is stopped after the air outlet holes on the heat distribution needle tube are completely immersed in the straw bale; S40, collaborative drying: start the main pipeline hot air supply system, and synchronously start the negative pressure moisture absorption device to maintain a vacuum degree of -10 to -25 kPa. The dried hot air is guided into the negative pressure air guide box through the moisture absorption holes arranged on the bearing platform. Then the hot air is drawn out of the equipment through the negative pressure pipe installed on the negative pressure moisture absorption port at the bottom of the negative pressure air guide box, forming a directional drying airflow from the core downward; S50, operation cycle: after the drying cycle is completed, the lifting device drives the straw bale to descend to the initial position, and the material handling equipment moves the dried straw bale out; S60, equipment group scheduling: according to the number of material handling equipment N, N ≥ 1, the drying equipment on the trailer is divided into N operating units, and each unit independently executes S20-S50 processes.

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