A mulching film laying device for seedling cultivation of traditional Chinese medicinal material seeds

Abstract

This invention relates to the field of seedling mulch laying technology, specifically to a mulch laying device for the cultivation of Chinese medicinal herb seeds and seedlings. It includes a traction device, a support frame, traveling wheels mounted on the support frame, and a mulch laying frame. A soil covering device is rotatably mounted on the rear end of the support frame. A pressure roller is elastically mounted on the support frame between the soil covering device and the mulch laying frame. A lateral soil-gathering mechanism capable of longitudinal displacement is mounted on the support frame between the mulch laying frame and the pressure roller. A negative pressure mechanism is located above the pressure roller. The mulch film can be laid flat or arched. The soil-gathering plates on both sides form a ridge with higher edges and a lower center, naturally distancing the center of the mulch film from the seedlings. The pressure roller presses the edges of the mulch film tightly, keeping it taut to prevent scorching of the seedlings and reduce the risk of tearing, thus ensuring the integrity of the mulch film.

Description

Technical Field

[0001] This invention relates to the field of seedling mulch laying technology, and more specifically, to a mulch laying device for the cultivation of Chinese medicinal herb seeds and seedlings. Background Technology

[0002] With the development of agriculture, sowing and seedling raising are the most important processes in agricultural planting. The seed is sown while the soil is turned over by the ridging seeder, which increases the looseness of the soil and improves the efficiency of sowing. After the seeds are sown, a protective film needs to be covered on the soil to ensure the humidity and temperature of the seed germination environment.

[0003] There are many existing technologies for plastic film laying devices, such as: Chinese Patent Publication No. CN120457932A discloses an agricultural planting mulch film laying device, the device including a seeder: including a frame platform set on the seeder, two connecting columns for docking with traction equipment are fixedly installed on the surface of the frame platform, and a fixed half-frame plate is fixedly installed on the surface of the frame platform; the soil gathering mechanism includes four bent plates installed on the frame platform for gathering soil.

[0004] Therefore, in the above-mentioned prior art, the soil is gathered into the trapezoidal space formed by the two bending plates and the compression block through the gathering effect between the two bending plates. The two bending plates move towards each other through the action of the reciprocating mechanism. At the same time, the compression block moves vertically downward under the action of the reciprocating mechanism, compressing the soil between the two bending plates and the compression block, forming trapezoidal raised paths on both sides of the sown soil, ensuring the stability of the mulch film support.

[0005] When the mulch film is laid flat on the raised bed, it is often taut due to the pressure of the rollers on both sides. On the one hand, the gap between the mulch film and the seedlings is too small, causing the seedlings to easily come into contact with the mulch film after germination. Under sunlight, the mulch film becomes too hot, scorching the seedlings. On the other hand, when the taut mulch film encounters sharp stones or hard particles on the raised bed, its central area is easily torn, compromising its integrity. Furthermore, when the rollers move upwards due to crushing stones or other obstacles, the height of the covering device increases, reducing the amount of soil guiding the mulch film to the edges and decreasing the pressure at the edges, thus affecting the stability of the mulch film. Summary of the Invention

[0006] This invention provides a mulch film laying device for the cultivation of Chinese medicinal herb seeds and seedlings. The device uses soil-gathering plates on both sides to form a ridge with high edges and a low center, so that the middle part of the mulch film is naturally away from the seedlings, thereby solving the problem mentioned in the background art, namely, the problem of the insufficient distance between the mulch film and the seedlings.

[0007] To achieve the above objectives, a mulch film laying device for the cultivation of Chinese medicinal herb seeds and seedlings includes a traction device, a support frame, traveling wheels and a film laying frame mounted on the support frame, a soil covering device rotatably mounted on the rear end of the support frame, a film pressing wheel elastically mounted on the support frame between the soil covering device and the film laying frame, and a lateral soil gathering mechanism capable of longitudinal displacement mounted on the support frame between the film laying frame and the film pressing wheel. A negative pressure mechanism is located above the film pressing wheel. The mulch film has two states: flat and arched. During the movement, the lateral soil gathering mechanisms on both sides contract inward, forcing the soil at the edge of the ridge to rise towards the center of the ridge, thereby forming a flat mulch film with high edges and a low center. At the same time, the negative pressure mechanism switches the mulch film from the flat state to the arched state according to the reciprocating motion of the film pressing wheel, and drives the soil covering device to rotate to replenish the soil in the furrows on the mulch film at the rear end of the film pressing wheel.

[0008] The soil-gathering mechanism includes two soil-gathering plates located below the mulch film, and an auxiliary rod that passes through the soil-gathering plates on both sides. The auxiliary rod is bent upward and fixed to the support frame by bolts. The soil-gathering plates and the auxiliary rod are slidably arranged. The soil-collecting plate has a soil-collecting end and a soil-drawing end, and the soil-drawing end extends outward toward the soil-collecting end to introduce soil into the furrow.

[0009] A stop block is fixedly installed on the auxiliary rod, and a support spring is elastically fixedly connected between the stop block and the soil-collecting end of the auxiliary rod.

[0010] The cross-section of the soil-collecting ends on both sides is trapezoidal, which is used to compress the soil at the edge of the ridge to form a soil bearing zone that supports the mulch film at the edge of the ridge.

[0011] The negative pressure mechanism includes a gas collecting cylinder fixedly mounted on a support frame with an open bottom, and a piston rod movably mounted inside the gas collecting cylinder. The bottom of the piston rod is rotatably mounted with a pressure roller, and a compression spring is elastically connected between the top of the piston rod and the inner wall of the gas collecting cylinder.

[0012] Several limiting strips are provided on the piston rod, and both the limiting strips and the piston rod are slidably disposed with the support frame.

[0013] The top of the gas cylinder is connected to a gas supply pipe and a gas inlet pipe. The end of the gas supply pipe is connected to an exhaust box fixed on a support frame. Both the gas supply pipe and the gas inlet pipe are equipped with one-way valves. The one-way valve in the gas supply pipe is used to guide gas into the exhaust box, and the one-way valve in the gas inlet pipe is used to guide external gas into the exhaust box.

[0014] A lever is fixedly installed on the piston rod, which passes through the top of the gas collecting cylinder. The end of the lever has a collar that wraps around the soil cover. Several spiral thrust blocks are installed inside the collar. Each thrust block is fitted with a corresponding spiral stop block, and the stop block is fixed to the soil cover.

[0015] The exhaust box is arc-shaped, with its middle part close to the ground film, and its direction of extension from the middle to both ends gradually moving away from the ground film. The exhaust box has an airflow channel inside, and the connection between the airflow channel and the gas transmission pipe is close to the ground film. The exhaust box has an opening on one side, and the exhaust box near the ground film has several exhaust holes that are inclined towards the opening. The exhaust holes are connected to the airflow channel.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In this mulch film laying device for the cultivation of Chinese medicinal herbs, the soil-collecting plates on both sides form a ridge shape with high edges and a low center, which naturally keeps the middle of the mulch film away from the seedlings. In addition, the pressing rollers press the two edges of the mulch film tightly, keeping the mulch film in a taut state to prevent the seedlings from being scorched and to reduce the risk of the mulch film being torn, thereby ensuring the integrity of the mulch film.

[0017] 2. In this mulch film laying device for the cultivation of Chinese medicinal herbs seeds and seedlings, when the pressing roller moves upward over the obstacle, the lever drives the soil covering device to tilt and rotate outward through the spiral wedging of the thrust block and the stop block, thereby increasing the amount of soil conveyed to the edge of the mulch film, compensating for the soil loss caused by the lifting of the soil covering device, maintaining the pressing force at the edge of the mulch film, and improving the stability of the mulch film. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram illustrating the principle of mulch film laying according to the present invention; Figure 3 This is a schematic diagram of the soil-collecting plate structure of the present invention; Figure 4 This is a schematic diagram of the connection between the soil-collecting plate and the auxiliary rod of the present invention; Figure 5 This is a schematic diagram of the mulch film laid flat according to the present invention; Figure 6 This is a schematic diagram showing the connection between the gas collecting cylinder and the exhaust box of the present invention; Figure 7 This is a cross-sectional view of the gas collecting cylinder of the present invention. Figure 8 This is a schematic diagram of the rotating soil covering device of the present invention; Figure 9 For the present invention Figure 8 Enlarged diagram of point A in the diagram; Figure 10 This is a schematic diagram illustrating the switching between the flat and arched states of the mulch film according to the present invention; Figure 11 This is a cross-sectional view of the exhaust box of the present invention; Figure 12 For the present invention Figure 11 The intention is to enlarge the junction at point B.

[0019] The meanings of the labels in the diagram are as follows: 100. Traction device; 101. Support frame; 102. Traveling wheels; 103. Film frame; 110. Soil cover; 111. Stop block; 112. Torsion spring; 120. Soil-collecting mechanism; 121. Soil-collecting plate; 122. Auxiliary rod; 123. Support spring; 124. Abutment block; 130. Pressing roller; 140. Air collection cylinder; 141. Piston rod; 142. Paddle lever; 143. Compression spring; 144. Air supply pipe; 145. Air inlet pipe; 146. Limiting strip; 147. Thrust block; 148. Exhaust box; 149. Exhaust port. Detailed Implementation

[0020] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Therefore, in view of the aforementioned problems of insufficient spacing between the mulch film and the seedlings, and reduced soil volume at the edges of the mulch film, this invention provides a mulch film laying device for the cultivation of medicinal herb seeds and seedlings, as shown in the reference. Figure 1 As shown, the system includes a traction device 100, a support frame 101, traveling wheels 102 mounted on the support frame 101, and a film-laying frame 103. During film covering, the traction device 100 provides power to the support frame 101 and pulls it along a preset path. The film-laying frame 103 covers the mulch film on the raised bed. A soil-covering device 110 is rotatably mounted on the rear end of the support frame 101. Figure 2 In the middle, a pressure roller 130 is elastically installed on the support frame 101 located between the soil covering device 110 and the film covering frame 103. The pressure roller 130 presses the film extending from both sides of the ridge to prevent the film from loosening. During the movement of the soil covering device 110, it guides the soil at the furrow to the rear. The guided soil accumulates at the edge of the film at the rear end of the pressure roller 130, thus covering the edge of the film and pressing it down to prevent it from loosening during wind or operation.

[0022] Secondly, a lateral soil-gathering mechanism 120 capable of longitudinal displacement is installed on the support frame 101 between the film-laying frame 103 and the pressing wheel 130. A negative pressure mechanism is located above the pressing wheel 130. The mulch film has two states: flat and arched. During travel, the lateral soil-gathering mechanisms 120 on both sides contract inward, forcing the soil at the edge of the ridge to bulge towards the center of the ridge, thus forming a flat mulch film pattern with high edges and a low center (see reference). Figure 5 As shown), simultaneously, the negative pressure mechanism switches the mulch film from a flat state to an arched state based on the reciprocating motion of the pressure roller 130 (see reference). Figure 12 As shown, w1 shows the mulch film in a flat state and w2 shows the mulch film in an arched state, so that the center of the mulch film is away from the seedling, and the negative pressure mechanism also drives the soil covering device 110 to rotate to replenish the soil in the furrows on the mulch film at the rear end of the pressing roller 130.

[0023] First, when covering the raised beds with film, adjust the soil-collecting mechanism 120 to its appropriate height according to the height of the raised beds, and then tighten it with nuts. Therefore, combined with Figure 2 and Figure 3 The diagram illustrates the specific structure of the soil-gathering mechanism 120. The mechanism includes two soil-gathering plates 121 located below the mulch film, and an auxiliary rod 122 passing through the soil-gathering plates 121. The auxiliary rod 122 is bent upwards and fixed to the support frame 101 with bolts. This allows the soil-gathering plates 121 to adapt to ridges of different depths, achieving the purpose of soil gathering and improving the adaptability of the device. Specifically, the soil-gathering plates 121 and the auxiliary rod 122 are slidably arranged. The soil-gathering plates 121 have a soil-gathering end and a soil-drawing end, so as to... Figure 4 For example, the soil is introduced from the soil-drawing end to the soil-gathering end, so that the soil in the furrow will gather towards the soil-gathering end during the process. Then, with Figure 5 For example, a stop block 124 is fixedly installed on the auxiliary rod 122. A support spring 123 is elastically fixed between the stop block 124 and the soil-gathering end of the auxiliary rod 122. During the mulching stage, the support spring 123 provides support for the soil-gathering end to prevent the soil-gathering end from sliding excessively outward under the action of soil resistance. Secondly, the cross-section of the soil-gathering ends on both sides is trapezoidal, which is used to compress the soil at the edge of the ridge to form a soil bearing area that supports the mulch film at the edge of the ridge. Specifically, during operation, the ridge is initially flat. As it moves, the soil-drawing end transports soil from the furrow to the soil-gathering end. The soil gathers at the gathering end, and the elastic support of the supporting spring 123 restricts the outward sliding of the gathering end, forcing the soil to the edge of the ridge. The compressed soil, guided by the gathering end, bulges upward, with the bulging soil exceeding the soil at the center of the ridge, thus forming... Figure 5 The state of the ridge shown.

[0024] When the mulch film is laid on the above-mentioned ridges, the soil in the bearing area at both edges of the ridges supports the mulch film, and the mulch film is in the following state: Figure 5 As shown by the dotted line, the middle part of the mulch film is a certain distance from the center of the ridge. This can initially achieve the purpose of leaving a gap between the mulch film and the seedling, avoiding contact between the seedlings and the mulch film after the seeds germinate, which would cause the seedlings to be sunburned due to excessively high mulch film temperature.

[0025] In other words, the ridges formed by the soil-collecting plates 121 on both sides are high at the edges and low in the center, so that the middle of the mulch film is naturally far away from the seedlings. In addition, the pressing rollers 130 press the two edges of the mulch film tightly, so that the mulch film is in a taut state, preventing the seedlings from being scorched, and reducing the risk of the mulch film being torn, thereby ensuring the integrity of the mulch film.

[0026] Furthermore, based on Figure 5 Based on and combined Figure 6 As shown, it should be clarified that the edge of the ridge is first formed by the compression of the soil-gathering plate 121, and then the rear pressing roller 130 presses the edge of the mulch film to make the mulch film sit on the soil of the bearing area, thereby achieving a taut state of the mulch film, preventing the mulch film from loosening and causing the mulch film in the center to sink, thus reducing the distance between the mulch film and the seedling.

[0027] exist Figure 6 and Figure 7 The specific structure of the negative pressure mechanism is shown. The negative pressure mechanism includes an air collecting cylinder 140 fixedly mounted on the support frame 101 with an open bottom, and a piston rod 141 movably mounted inside the air collecting cylinder 140. The bottom of the piston rod 141 is rotatably mounted with the pressure roller 130, and the top of the piston rod 141 is elastically connected to the inner wall of the air collecting cylinder 140 with a compression spring 143. In this way, during the movement of the pressure roller 130, the compression spring 143 can provide support for the pressure roller 130 below through the piston rod 141. In order to prevent the pressure roller 130 from deviating, a number of limiting strips 146 are provided on the piston rod 141. The limiting strips 146 and the piston rod 141 are slidably mounted with the support frame 101. The limiting strips 146 restrict the rotation of the piston rod 141, so that the piston rod 141 can move up and down. Working principle: To ensure the smooth reciprocating motion of the piston rod 141, the top of the gas collecting cylinder 140 is connected to a gas supply pipe 144 and a gas inlet pipe 145 respectively. The end of the gas supply pipe 144 is connected to an exhaust box 148 fixed on the support frame 101. Both the gas supply pipe 144 and the gas inlet pipe 145 are equipped with one-way valves. Therefore, when the piston rod 141 moves upward, the one-way valve in the gas inlet pipe 145 is closed, while the one-way valve in the gas supply pipe 144 is open and used to guide gas into the exhaust box 148. Conversely, when the piston rod 141 moves downward under the elastic action of the compression spring 143, the one-way valve in the gas supply pipe 144 is closed, while the one-way valve in the gas inlet pipe 145 is open and used to guide external gas into the exhaust box 148. In addition, a lever 142 is fixedly installed on the piston rod 141, which passes through the top of the gas collecting cylinder 140, in conjunction with... Figure 8As shown, the end of the lever 142 has a collar that wraps around the cover 110, and several spiral thrust blocks 147 are arranged inside the collar (the shape of the thrust blocks 147 is shown in the figure). Figure 9 (As shown by the dashed line), each thrust block 147 is fitted with a corresponding helical stop block 111, which is fixed to the backfill device 110; thus, combined with Figure 7 As shown, during the reciprocating motion of the piston rod 141, the piston rod 141 has two functions. First, the upward movement of the piston rod 141 can not only expel the gas inside, but also drive the collar to move upward through the lever 142, thereby realizing the rotation of the cover 110. The following illustrates the effect of lever 142 driving the collar upward: Due to the compression spring 143, the soil covering device 110 is rotatably connected to the support frame 101. A torsion spring 112 is provided between the soil covering device 110 and the support frame 101, that is, the soil covering device 110 and the support frame 101 are integrated. Thus, when the pressing roller 130 crushes stones in the soil, the pressing roller 130 moves upward and transmits pressure to the compression spring 143. The compression spring 143 is compressed under the restraint of the air collecting cylinder 140 and the overall gravity of the support frame 101, and its elastic potential energy increases. When the compression spring 143 is compressed to the point that it can overcome the weight it bears above, the compression spring 143 will no longer compress further, but will drive the support frame 101 and the soil covering device 110 to move upward. The height of the soil covering device 110 increases, resulting in less soil being guided to the edge of the mulch film, which affects the soil's compaction effect on the mulch film.

[0028] Therefore, when the lever 142 drives the collar to move upward, the thrust block 147 moves upward and applies pressure to the stop block 111 through contact with the stop block 111. This overcomes the torsional force of the torsion spring 112, causing the cover 110 to rotate, which in turn drives the stop block 111 to move the cover 110. Figure 8 When rotated in the direction indicated by the middle arrow, the covering device 110 tilts outward from the furrow, thereby introducing more soil from the furrow to cover the edge of the mulch film, thus supplementing the lack of soil at the edge of the mulch film. Conversely, when the lever 142 moves downward, it indicates that the pressing roller 130 passes over the crushed stones, and under the action of the torsion spring 112, it drives the covering device 110 to rotate in the opposite direction.

[0029] In summary, when the pressing roller 130 moves upward over the obstacle, the lever 142 engages with the stop block 111 through the spiral wedging of the thrust block 147, driving the covering device 110 to tilt and rotate outward, thereby increasing the amount of soil conveyed to the edge of the mulch film, compensating for the soil loss caused by the lifting of the covering device 110, maintaining the pressing force at the edge of the mulch film, and improving the stability of the mulch film.

[0030] At the same time, since the ridges mentioned above are not arched at the two edges, the arched edges of the ridges will shorten the length of the mulch film. Therefore, by adding soil to the edges of the mulch film to increase the weight at the edges of the mulch film, the compaction effect can be improved, and the loosening of the mulch film during wind blowing or operation can be further prevented.

[0031] The following is combined with Figure 10 , Figure 11 as well as Figure 12 The upward movement of piston rod 141 illustrates the following effect: The exhaust box 148 is arc-shaped, with its center close to the mulch film and extending further away from it towards both ends. The exhaust box 148 has airflow channels inside, with the connection between the airflow channels and the gas delivery pipe 144 close to the mulch film. On the other hand, one side of the exhaust box 148 is open, and the exhaust box 148 near the mulch film has several exhaust holes 149 inclined towards its opening. These exhaust holes 149 communicate with the airflow channels. Thus, when piston rod 141 moves upward, the gas inside the gas collecting cylinder 140 is channeled through the gas delivery pipe 144. When the air is delivered into the airflow channel, one side of the exhaust box 148 is open, allowing the airflow to be ejected horizontally without obstruction. As the airflow flows through the airflow channel, a negative pressure is formed in the exhaust hole 149. In addition, the exhaust hole 149 is close to the mulch film, and the center of the mulch film arches upward under the action of negative pressure. The mulch film changes from the flat state w1 to the arched state w2, further increasing the distance between the mulch film and the seedling. This prevents the mulch film from being torn by stones or other objects in the ridge when it is pressed tightly by the pressing rollers 130 on both sides, thus ensuring the integrity of the mulch film.

[0032] It should be noted that the vent 149 is located near the bottom of the film on both sides of the pressing roller 130. This allows the negative pressure generated when the pressing roller 130 presses the film to attract the film and improve the film's deformation capacity.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mulch film laying device for cultivating Chinese medicinal herbs seeds and seedlings, comprising a traction device (100), a support frame (101), traveling wheels (102) mounted on the support frame (101), and a film laying frame (103), wherein a soil covering device (110) is rotatably mounted on the rear end of the support frame (101), characterized in that: A pressure roller (130) is elastically installed on the support frame (101) located between the soil covering device (110) and the film laying frame (103). A lateral soil gathering mechanism (120) capable of longitudinal displacement is installed on the support frame (101) between the film laying frame (103) and the pressure roller (130). A negative pressure mechanism is provided above the pressure roller (130). The mulch film has two states: flat and arched. During the movement, the lateral soil gathering mechanisms (120) on both sides contract inward, forcing the soil at the edge of the ridge to rise towards the center of the ridge, thereby forming a flat mulch film with high edges and low center. At the same time, the negative pressure mechanism switches the mulch film from the flat state to the arched state according to the reciprocating motion of the pressure roller (130), and drives the soil covering device (110) to rotate to replenish the soil at the furrow on the mulch film at the rear end of the pressure roller (130).

2. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 1, characterized in that: The soil-gathering mechanism (120) includes two soil-gathering plates (121) located below the mulch film, and an auxiliary rod (122) that passes through the two soil-gathering plates (121). The auxiliary rod (122) is bent upward and fixed to the support frame (101) by bolts. The soil-gathering plates (121) and the auxiliary rod (122) are slidably arranged. The soil-collecting plate (121) has a soil-collecting end and a soil-drawing end, wherein the soil-drawing end extends outward toward the soil-collecting end to introduce soil into the furrow.

3. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 2, characterized in that: A stop block (124) is fixedly installed on the auxiliary rod (122), and a support spring (123) is elastically fixedly connected between the stop block (124) and the soil-collecting end of the auxiliary rod (122).

4. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 2, characterized in that: The cross-section of the soil-collecting ends on both sides is trapezoidal, which is used to compress the soil at the edge of the ridge to form a soil bearing zone that supports the mulch film at the edge of the ridge.

5. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 1, characterized in that: The negative pressure mechanism includes an air collecting cylinder (140) fixedly mounted on a support frame (101) and having an open bottom, and a piston rod (141) movably mounted inside the air collecting cylinder (140). The bottom of the piston rod (141) is rotatably mounted with the pressure roller (130), and the top is elastically connected to the inner wall of the air collecting cylinder (140) with a compression spring (143).

6. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 5, characterized in that: A plurality of limiting strips (146) are provided on the piston rod (141), and the limiting strips (146) and the piston rod (141) are slidably disposed with the support frame (101).

7. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 5, characterized in that: The top of the gas collecting cylinder (140) is connected to a gas supply pipe (144) and an air inlet pipe (145). The end of the gas supply pipe (144) is connected to an exhaust box (148) fixed on the support frame (101). Both the gas supply pipe (144) and the air inlet pipe (145) are equipped with one-way valves. The one-way valve in the gas supply pipe (144) is used to guide gas into the exhaust box (148), and the one-way valve in the air inlet pipe (145) is used to guide external gas into the exhaust box (148).

8. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 5, characterized in that: A lever (142) is fixedly installed on the piston rod (141) and passes through the top of the gas collecting cylinder (140). The end of the lever (142) has a collar that wraps around the soil covering device (110). Several spiral thrust blocks (147) are provided inside the collar. Each thrust block (147) is adapted to a corresponding spiral stop block (111). The stop block (111) is fixed to the soil covering device (110).

9. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 7, characterized in that: The exhaust box (148) is arc-shaped, with its middle part close to the ground film, and its extension direction from the middle to both ends gradually moves away from the ground film. The exhaust box (148) has an airflow channel inside, and the connection between the airflow channel and the gas transmission pipe (144) is close to the ground film. The exhaust box (148) has an opening on one side, and the exhaust box (148) near the ground film has several exhaust holes (149) that are inclined toward its opening direction. The exhaust holes (149) are connected to the airflow channel.

10. The mulch film laying device for cultivating Chinese medicinal herbs according to claim 1, characterized in that: A torsion spring (112) is provided between the soil cover (110) and the support frame (101).

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