Saline-alkali soil treatment device and treatment method

Abstract

The invention discloses a saline-alkali soil treatment device which comprises a ditching mechanism, a gravel feeding mechanism and a soil backfilling mechanism. Wherein the ditching mechanism comprises a ditching disc which is rotatably arranged on the rear side of the tractor body and is used for ditching; the sand and stone putting mechanism comprises a sand and stone storage hopper and a sand and stone compaction roller which are arranged on the rear side of the ditching mechanism, a sand and stone putting opening is formed in the bottom of the storage hopper, and the sand and stone compaction roller is rotationally arranged on one side of the sand and stone storage hopper through a first driving assembly; under the action of the first driving assembly, the compaction roller can roll in the extending direction of the formed groove; the soil backfilling mechanism is arranged on the rear side of the gravel throwing mechanism and used for backfilling dug soil to the upper layer of the gravel layer, a gravel isolation layer formed by gravel can be formed on the lower layer of the ploughed soil layer through the gravel throwing mechanism, and the gravel isolation layer can prevent salt on the lower layer from rising to the surface layer of the soil along with evaporation of water; therefore, the treatment effect on soil salinization can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement devices, and in particular relates to a saline-alkali land treatment device and a treatment method. Background Art

[0002] Saline-alkali land is mainly distributed in arid and semi-arid areas. The formation principle is that the salt contained in the bottom soil and groundwater rises to the surface layer with the capillary action of the soil. When the water evaporates, the salt remains in the surface layer of the soil and slowly accumulates to form saline-alkali land. Soil salinization will change the rational characteristics of the soil, making its physical and chemical properties worse, and reducing the organic matter content in the soil. At the same time, salinization will also affect the soil nutritional conditions, thereby affecting the normal growth of crops. Through scientific farming and improvement measures, soil salinity can be reduced, soil structure can be improved, saline-alkali land that is not suitable for agricultural production can be converted into arable land, and the effective utilization area of ​​land resources can be increased. Deep plowing of saline-alkali land is an effective measure to control saline-alkali land. By deep plowing the soil, the salt rising channel in the soil can be interrupted and the accumulation of salt to the surface can be reduced.

[0003] At present, deep tillage machines are often used to cultivate the soil when deep plowing is carried out on saline-alkali land. The existing deep tillage machines include a machine body, a plow body and a plowshare. The plow body is a frame installed at one end of the machine body for supporting the plowshare. The plowshare is a metal component used to turn the soil. The plowshare on the deep tillage machine can completely turn the soil over, turning the bottom layer of soil to the surface, while the upper layer of soil is buried in the lower layer.

[0004] When a deep tiller is used to treat saline-alkali land, it can turn the surface soil with a higher salt content to the lower layer through deep plowing to reduce the surface salt. However, after a long time, the salt in the deep layer of the lower soil will seep up, and it cannot achieve effective treatment of the saline-alkali land. Summary of the invention

[0005] The purpose of the present invention is to provide a saline-alkali land treatment device, which solves the problem that the current deep tillage machine is used to treat the saline-alkali land but the effect is not good.

[0006] The technical solution adopted by the present invention is a saline-alkali land treatment device, comprising:

[0007] The trenching mechanism comprises a trenching disc rotatably arranged at the rear side of the tractor body for trenching;

[0008] The sand and gravel delivery mechanism comprises a sand and gravel storage funnel and a sand and gravel compaction roller arranged at the rear side of the trenching mechanism. A sand and gravel delivery port is arranged at the bottom of the storage funnel. The sand and gravel compaction roller is arranged on one side of the sand and gravel storage funnel through the rotation of a first driving assembly. Under the action of the first driving assembly, the compaction roller can roll along the extension direction of the opened trench.

[0009] The soil backfilling mechanism is arranged at the rear side of the sand and gravel delivery mechanism. The soil backfilling mechanism is used to backfill the excavated soil to the upper layer of the sand and gravel layer. Through the sand and gravel delivery mechanism, a sand and gravel isolation layer formed by sand and gravel can be covered on the lower layer of the soil after plowing. The sand and gravel isolation layer can prevent the salt in the lower layer from rising to the soil surface with the evaporation of water.

[0010] Preferably, the trenching mechanism also includes two swing arms, two first mounting plates and a trenching shaft, wherein the two swing arms are rotatably arranged on both sides of the rear part of the tractor body and can swing up and down, the two first mounting plates are respectively arranged at the ends of the swing arms, the trenching shaft is arranged between the two first mounting plates, and the trenching disc is arranged on the trenching shaft.

[0011] Preferably, a bracket for installing a sand and gravel storage funnel is also provided on the rear side of the tractor body, and an impeller is rotatably provided at the bottom of the sand and gravel delivery port of the sand and gravel storage funnel, and the impeller is rotatably provided on the first support shaft.

[0012] Preferably, the first drive assembly includes second mounting plates respectively arranged on the rear side of the first mounting plate, a second support shaft parallel to the first support shaft is also arranged between the two second mounting plates, a chain transmission component is arranged between the second support shaft and the first support shaft, and the compaction roller is arranged on the second support shaft.

[0013] Preferably, a water tank is also provided on the rear side of the sand and gravel storage funnel, and a water pipe and a nozzle are connected to the water outlet at the bottom of the water tank in sequence, and the nozzle points to the compaction roller. A butterfly valve is also provided at the connection between the water pipe and the nozzle, and a transmission gear set is also provided between the butterfly valve and the first support shaft. When the first support shaft rotates, it can drive the butterfly valve to be opened, so that the water in the water tank can be sprayed on the compaction roller.

[0014] Preferably, the butterfly valve includes a valve sleeve, a valve stem and a butterfly plate. The valve sleeve is connected between the water pipe and the nozzle. The butterfly plate is rotatably arranged on the inner side of the valve sleeve. One end of the valve stem is connected to the butterfly plate, and the other end of the valve stem passes through the valve sleeve. The transmission gear set is arranged between the valve stem and the first support shaft. When the first support shaft rotates, it can drive the valve stem to rotate continuously.

[0015] Preferably, mounting cross plates are respectively provided on both sides of the trenching mechanism, and the mounting cross plates are slidably arranged on the rear side of the tractor body, and can slide in the vertical direction. The soil backfilling mechanism includes a soil crushing rake and a soil backfilling rake, and the soil crushing rake is arranged on the bottom surface of the mounting cross plates. The mounting cross plates are connected to the trenching mechanism through a second drive assembly, and the mounting cross plates can be driven to slide back and forth in the vertical direction through the second drive assembly. The two soil backfilling rakes are slidably arranged on the rear side of the storage funnel through a third drive assembly, and the soil backfilling rakes can slide back and forth in a direction perpendicular to the forward movement of the tractor body through the third drive assembly.

[0016] Preferably, both ends of the trenching shaft pass through the first mounting plate, and the second driving assembly includes a crank arranged at the end of the trenching shaft, and a connecting rod is hinged on the crank, and one end of the connecting rod is hinged to the mounting plate.

[0017] Preferably, the third driving assembly includes a second motor arranged at the bottom of the water tank, the output shaft of the second motor is vertically downward and a spur gear is arranged on it, slide plates are slidably arranged on the front and rear sides of the spur gear respectively, and the slide plates can slide back and forth along a direction perpendicular to the forward direction of the tractor body, and a rack meshing with the spur gear is also arranged on the slide plate, and the two soil backfill rakes are respectively connected to the corresponding slide plates.

[0018] Another technical solution disclosed in the present invention is a method for treating saline-alkali land, based on the above saline-alkali land treatment device, comprising the following steps:

[0019] Ditching in saline-alkali land by trenching mechanism;

[0020] Sand and gravel are filled into the excavated ditch through the sand and gravel storage funnel, and compacted by the compaction roller. At the same time, the sand and gravel are moistened by the water in the water tank so that the sand and gravel form a tight sand and gravel isolation layer;

[0021] The excavated soil is crushed by a soil crushing rake, and finally the crushed soil is backfilled into the upper layer of the sand and gravel isolation layer by a soil backfill rake.

[0022] The beneficial effects of the present invention are:

[0023] The invention discloses a saline-alkali land treatment device. When treating the saline-alkali land, trenching is first performed by a trenching mechanism. The trenching disc can complete the deep trenching action and make the soil excavated after the trenching be piled on both sides of the trenched ditch. When the ditch is opened, the sand and gravel inside the sand and gravel storage funnel can fall on the inner side of the trenched ditch. Then, the sand and gravel in the ditch can be compacted by a rolling sand and gravel compacting roller to form a soil isolation layer. Finally, the soil can be backfilled to the upper layer of the sand and gravel isolation layer by the soil backfilling mechanism. Therefore, after being treated by the saline-alkali land treatment device of the invention, a sand and gravel isolation layer formed by sand and gravel can be formed in the lower layer of the tilled soil. Because the sand and gravel have good water permeability, they can be laid in the soil as a drainage layer, which promotes the rapid infiltration and discharge of excess water and reduces the retention of water in the soil surface. Therefore, the sand and gravel isolation layer can also reduce the salt rising to the soil surface with the evaporation of water. Therefore, the saline-alkali land treatment device disclosed by the invention can improve the treatment effect of soil salinization. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a saline-alkali land treatment device of the present invention;

[0025] Figure 2It is a transmission schematic diagram of a valve stem on a saline-alkali land treatment device of the present invention;

[0026] Figure 3 It is a schematic diagram of a butterfly valve on a saline-alkali land treatment device of the present invention;

[0027] Figure 4 The invention discloses a transmission schematic diagram of a horizontal plate installed on a saline-alkali land treatment device.

[0028] In the figure, 1, tractor body; 2, sand and gravel storage funnel; 3, compaction roller; 4, second mounting plate; 5, trenching shaft; 6, soil crushing rake; 7, soil backfilling rake; 8, swing arm; 9, first mounting plate; 10, impeller; 11, first support shaft; 12, bracket; 13, support plate; 14, second support shaft; 15, transmission chain; 16, water tank; 17, water pipe; 18, nozzle; 19, valve sleeve; 20, valve stem; 21, butterfly plate; 22, mounting cross plate; 23, crank; 24, connecting rod; 25, spur gear; 26, slide plate; 27, trenching disc. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection solution of the present invention.

[0030] Saline-alkali land is mainly distributed in arid and semi-arid areas. The formation principle is that the salt contained in the bottom soil and groundwater rises to the surface layer with the capillary action of the soil. When the water evaporates, the salt remains in the surface layer of the soil and slowly accumulates to form saline-alkali land. Soil salinization will change the rational characteristics of the soil, making its physical and chemical properties worse, and reducing the organic matter content in the soil. At the same time, salinization will also affect the soil nutritional conditions, thereby affecting the normal growth of crops. Through scientific farming and improvement measures, soil salinity can be reduced, soil structure can be improved, saline-alkali land that is not suitable for agricultural production can be converted into arable land, and the effective utilization area of ​​land resources can be increased. Deep plowing of saline-alkali land is an effective measure to control saline-alkali land. By deep plowing the soil, the salt rising channel in the soil can be interrupted and the accumulation of salt to the surface can be reduced.

[0031] At present, deep tillage machines are often used to cultivate the soil when deep plowing is carried out on saline-alkali land. The existing deep tillage machines include a machine body, a plow body and a plowshare. The plow body is a frame installed at one end of the machine body for supporting the plowshare. The plowshare is a metal component used to turn the soil. The plowshare on the deep tillage machine can completely turn the soil over, turning the bottom layer of soil to the surface, while the upper layer of soil is buried in the lower layer.

[0032] When using a deep tiller to treat saline-alkali land, deep plowing can turn the surface soil with a higher salt content to the lower layer to reduce the surface salt. However, after a long time, the salt in the deep layer of the lower soil will seep up, and the saline-alkali land cannot be effectively treated.

[0033] The invention discloses a saline-alkali land treatment device, such as Figure 1-3 As shown, it includes a trenching mechanism, a sand and gravel delivery mechanism and a soil backfilling mechanism; wherein the trenching mechanism includes a trenching plate 27 rotatably arranged at the rear side of the tractor body 1 for trenching; the sand and gravel delivery mechanism includes a sand and gravel storage hopper 2 and a sand and gravel compacting roller 3 arranged at the rear side of the trenching mechanism, and a sand and gravel delivery port is arranged at the bottom of the storage hopper 2. The sand and gravel compacting roller 3 is rotatably arranged on one side of the sand and gravel storage hopper 2 through a first driving component, and the compacting roller 3 can roll along the extension direction of the opened trench under the action of the first driving component; the soil backfilling mechanism is arranged at the rear side of the sand and gravel delivery mechanism, and the soil backfilling mechanism is used to backfill the excavated soil to the upper layer of the sand and gravel layer. Through the sand and gravel delivery mechanism, a sand and gravel isolation layer formed by sand and gravel can be covered on the lower layer of the soil after plowing, and the sand and gravel isolation layer can prevent the salt in the lower layer from rising to the soil surface with the evaporation of water.

[0034] When the saline-alkali land treatment device disclosed in the present invention is used, trenching is first performed by a trenching mechanism, and the trenching mechanism adopts an existing trenching plate. The trenching plate can complete deep trenching and the soil excavated after trenching is piled on both sides of the trenched ditch. When the ditch is opened, the sand and gravel inside the sand and gravel storage funnel 2 can fall on the inner side of the trenched ditch. Then, the sand and gravel in the ditch can be compacted by the rolling sand and gravel compacting roller 3 to form a soil isolation layer. Finally, the crushed soil can be backfilled to the upper side of the sand and gravel isolation layer by the soil backfilling mechanism. Therefore, after treatment by the saline-alkali land treatment device of the present invention, a sand and gravel isolation layer formed by sand and gravel can be formed in the lower layer of the soil after plowing. Because sand and gravel have good water permeability, they can be laid in the soil as a drainage layer, which promotes the rapid infiltration and discharge of excess water and reduces the retention of water in the soil surface. In addition, the sand and gravel isolation layer can also reduce the salt rising to the soil surface with the evaporation of water. Therefore, the saline-alkali land treatment device disclosed in the present invention can improve the treatment effect of soil salinization.

[0035] In order to realize the primary trenching step of soil treatment, the trenching mechanism disclosed in this embodiment also includes two swing arms 8, two first mounting plates 9 and a trenching shaft 5, wherein the two swing arms 8 are respectively rotatably arranged on both sides of the rear part of the tractor body 1 and can swing up and down, the two first mounting plates 9 are respectively arranged at the ends of the swing arms 8, the trenching shaft 5 is arranged between the two first mounting plates 9, the inner side of one mounting plate is provided with a first motor for driving the trenching shaft 5 to rotate, and the trenching disc 27 is arranged on the trenching shaft 5. The depth of the trenching can be adjusted by adjusting the swing arms 8, and the trenching disc 27 can perform the trenching action when rotating.

[0036] Furthermore, the rear side of the tractor body 1 disclosed in this embodiment is also provided with a bracket 12 for installing the sand and gravel storage hopper 2, the bottom of the sand and gravel storage hopper 2 is also provided with an impeller 10 and a first support shaft 11 for supporting the rotation of the impeller 10, and the bottom of the sand and gravel storage hopper 2 is provided with a support plate 13 for installing the first support shaft 11, and the first support shaft 11 is rotatably arranged on the support plate 13. Therefore, when the sand and gravel flow out from the bottom of the sand and gravel storage hopper 2, the impeller 10 and the first support shaft 11 supporting the rotation thereof can be driven to rotate, and when the first support shaft 11 rotates, it can provide power for the subsequent rotation of the sand and gravel compacting roller 3.

[0037] In order to realize the rotation of the sand and gravel compaction roller 3, the first driving assembly disclosed in this embodiment includes a second mounting plate 4 respectively arranged on the rear side of the first mounting plate 9, a second support shaft 14 parallel to the first support shaft 11 is also arranged between the two second mounting plates 4, a chain transmission component is arranged between the second support shaft 14 and the first support shaft 11, and the compaction roller 3 is arranged on the second support shaft 14 and can rotate in the same direction as the impeller 10. The specific chain transmission component includes a first sprocket arranged at one end of the first support shaft 11, and also includes a second sprocket arranged at one end of the second support shaft 14, a transmission chain 15 is arranged between the first sprocket and the second sprocket, and a protective shell is also arranged on the outer side of the first sprocket, the second sprocket and the transmission chain 15, so that when the first support shaft 11 rotates, the second support shaft 14 can be driven to rotate through the chain transmission component, so that the compaction roller 3 arranged on the second support shaft 14 rotates to compact the soil.

[0038] When compacting sand and gravel, a small amount of water can be added to make the sand and gravel tightly bonded together. Therefore, a water tank 16 is also provided on the rear side of the sand and gravel storage funnel 2 disclosed in this embodiment. The water outlet at the bottom of the water tank 16 is connected with a water pipe 17 and a nozzle 18 in sequence. The nozzle 18 points to the compacting roller 3. A butterfly valve is also provided at the connection between the water pipe 17 and the nozzle 18. A transmission gear set is also provided between the butterfly valve and the first support shaft 11. When the first support shaft 11 rotates, it can drive the butterfly valve to be opened, so that the water in the water tank 16 can be sprayed on the compacting roller 3. The specific butterfly valve includes a valve sleeve 19, a valve stem 20 and a butterfly plate 21. The valve sleeve 19 is connected between the water pipe 17 and the nozzle 18. The butterfly plate 21 is rotatably arranged on the inner side of the valve sleeve 19. One end of the valve stem 20 is connected to the butterfly plate 21, and the other end of the valve stem 20 passes through the valve sleeve 19. The transmission gear set is arranged between the valve stem 20 and the first support shaft 11. When the first support shaft 11 rotates, it can drive the valve stem 20 to rotate continuously. When the valve stem 20 rotates, it also drives the butterfly plate 21 to rotate. When the butterfly plate 21 rotates to a certain angle, the water pipe 17 and the nozzle 18 are opened, so that the water in the water tank 16 can flow out intermittently and remain on the compaction roller 3. Finally, when the water flows into the sand and gravel, it can assist the compaction process of the sand and gravel, so that the isolation layer formed by the sand and gravel can be more tightly bonded together.

[0039] Furthermore, if Figure 4 As shown, the two sides of the trenching mechanism disclosed in this embodiment are also provided with mounting cross plates 22, which are slidably arranged on the rear side of the tractor body 1, and the mounting cross plates 22 can slide in the vertical direction. The soil backfilling mechanism includes a soil crushing rake 6 and a soil backfilling rake 7, and the soil crushing rake 6 is arranged on the bottom surface of the mounting cross plate 22. The mounting cross plate 22 is connected to the trenching mechanism through a second drive assembly, and the mounting cross plate 22 can be driven to slide back and forth in the vertical direction through the second drive assembly. The two soil backfilling rakes 7 are slidably arranged on the rear side of the storage funnel 2 through a third drive assembly, and the soil backfilling rakes 7 can slide back and forth in a direction perpendicular to the forward movement of the tractor body 1 through the third drive assembly. Therefore, when the trenching shaft 5 rotates to drive the trenching disc 27 to rotate for trenching, it can also drive the crank 23 to rotate. When the crank 23 rotates, it drives the connecting rod 24 to move, thereby driving the mounting plate 2 to slide in the vertical direction. Therefore, the crushing rake 6 arranged on the mounting cross plate 22 can slide up and down to play a role in crushing the soil.

[0040] After the soil is crushed, in order to timely backfill the soil to the upper side of the sand and gravel isolation layer, the third driving assembly disclosed in this embodiment includes a second motor arranged at the bottom of the water tank 16, the output shaft of the second motor is vertically downward and a spur gear 25 is arranged on it, and slide plates 26 are respectively slidably arranged on the front and rear sides of the spur gear 25, and the slide plates 26 can slide back and forth along the direction perpendicular to the forward movement of the tractor body 1, and the slide plates 26 are also provided with racks 27 meshing with the spur gear 25, and two soil backfilling rakes 7 are respectively connected to the corresponding slide plates 26. Finally, when the second motor is working, it drives the spur gear 25 to rotate, and when the spur gear 25 rotates, it drives the two racks 27 meshing with it to slide back and forth in the ditch direction. The second motor is a forward and reverse motor, so it can realize the forward and reverse rotation of the two racks, and finally realizes the drive to slide back and forth along the width direction of the ditch. The two soil backfilling rakes 7 connected to the two slide plates 26 slide back and forth to backfill the crushed soil in time.

[0041] The present invention also discloses a saline-alkali land treatment method, which is based on the above saline-alkali land treatment device and is characterized by comprising the following steps:

[0042] Ditching in saline-alkali land by trenching mechanism;

[0043] Sand and gravel are filled into the opened ditch through the sand and gravel storage funnel 2, and the sand and gravel are compacted by the compaction roller 3. At the same time, the sand and gravel are moistened by the water in the water tank 16 so that the sand and gravel form a tight isolation layer;

[0044] The excavated soil is crushed by a soil crushing rake 6, and finally the crushed soil is backfilled into the upper layer of the isolation layer by a soil backfilling rake 7.

[0045] The embodiments described above are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belong to the protection scope of the present invention.

Claims

1. A saline-alkali land treatment device, characterized in that: include: A trenching mechanism, comprising a trenching disc (27) rotatably arranged on the rear side of the tractor body (1) for trenching; The sand and gravel delivery mechanism comprises a sand and gravel storage hopper (2) and a sand and gravel compaction roller (3) arranged at the rear side of the trenching mechanism, wherein a sand and gravel delivery port is arranged at the bottom of the sand and gravel storage hopper (2), and the sand and gravel compaction roller (3) is arranged on one side of the sand and gravel storage hopper (2) and is rotatably arranged by a first driving component, and under the action of the first driving component, the compaction roller (3) can roll along the extension direction of the trench opened; A soil backfilling mechanism is arranged at the rear side of the sand and gravel delivery mechanism. The soil backfilling mechanism is used to backfill the excavated soil to the upper layer of the sand and gravel layer. Through the sand and gravel delivery mechanism, a sand and gravel isolation layer formed by sand and gravel can be covered on the lower layer of the soil after plowing. The sand and gravel isolation layer can prevent the salt in the lower layer from rising to the soil surface as the water evaporates.

2. A saline-alkali land treatment device according to claim 1, characterized in that: The trenching mechanism further comprises two swing arms (8), two first mounting plates (9) and a trenching shaft (5), wherein the two swing arms (8) are rotatably arranged on both sides of the rear part of the tractor body (1) and can swing up and down, the two first mounting plates (9) are respectively arranged at the ends of the swing arms (8), the trenching shaft (5) is arranged between the two first mounting plates (9), and the trenching disc (27) is arranged on the trenching shaft (5).

3. A saline-alkali land treatment device according to claim 2, characterized in that: The rear side of the tractor body (1) is also provided with a bracket (12) for mounting the sand and gravel storage hopper (2); an impeller (10) is rotatably provided at the bottom of the sand and gravel delivery port of the sand and gravel storage hopper (2); and the impeller (10) is rotatably provided on a first support shaft (11).

4. A saline-alkali land treatment device according to claim 3, characterized in that: The first driving assembly comprises second mounting plates (4) respectively arranged on the rear side of the first mounting plates (9); a second support shaft (14) parallel to the first support shaft (11) is also arranged between the two second mounting plates (4); a chain transmission component is arranged between the second support shaft (14) and the first support shaft (11); and the compacting roller (3) is arranged on the second support shaft (14).

5. A saline-alkali land treatment device according to claim 4, characterized in that: A water tank (16) is also provided at the rear side of the sand and gravel storage funnel (2). A water pipe (17) and a nozzle (18) are connected to the water outlet at the bottom of the water tank (16) in sequence. The nozzle (18) points to the compaction roller (3). A butterfly valve is also provided at the connection between the water pipe (17) and the nozzle (18). A transmission gear set is also provided between the butterfly valve and the first support shaft (11). When the first support shaft (11) rotates, the butterfly valve can be driven to be opened, so that the water in the water tank (16) can be sprayed onto the compaction roller (3).

6. A saline-alkali land treatment device according to claim 5, characterized in that: The butterfly valve comprises a valve sleeve (19), a valve stem (20) and a butterfly plate (21); the valve sleeve (19) is connected between the water pipe (17) and the nozzle (18); the butterfly plate (21) is rotatably arranged inside the valve sleeve (19); one end of the valve stem (20) is connected to the butterfly plate (21); the other end of the valve stem (20) passes through the valve sleeve (19); the transmission gear set is arranged between the valve stem (20) and the first support shaft (11); when the first support shaft (11) rotates, it can drive the valve stem (20) to rotate continuously.

7. A saline-alkali land treatment device according to claim 4, characterized in that: The two sides of the trenching mechanism are also provided with mounting transverse plates (22), respectively. The mounting transverse plates (22) are slidably arranged on the rear side of the tractor body (1), and the mounting transverse plates (22) can slide in the vertical direction. The soil backfilling mechanism comprises a soil crushing rake (6) and a soil backfilling rake (7). The soil crushing rake (6) is arranged on the bottom surface of the mounting transverse plate (22). The mounting transverse plate (22) is connected to the trenching mechanism through a second drive assembly, and the mounting transverse plate (22) can be driven to slide back and forth in the vertical direction through the second drive assembly. The two soil backfilling rakes (7) are slidably arranged on the rear side of the sand and gravel storage funnel (2) through a third drive assembly, and the soil backfilling rakes (7) can slide back and forth in a direction perpendicular to the forward movement of the tractor body (1) through the third drive assembly.

8. A saline-alkali land treatment device according to claim 7, characterized in that: Both ends of the trenching shaft (5) pass through the first mounting plate (9), and the second driving assembly includes a crank (23) arranged at the end of the trenching shaft (5), and a connecting rod (24) is hinged on the crank (23), and one end of the connecting rod (24) is hinged to the mounting cross plate (22).

9. The saline-alkali land treatment device according to claim 5, characterized in that: The third driving assembly comprises a second motor arranged at the bottom of the water tank (16), the output shaft of the second motor is vertically downward and is provided with a spur gear (25), the front and rear sides of the spur gear (25) are respectively provided with slide plates (26) for sliding, and the slide plates (26) can slide back and forth along a direction perpendicular to the forward direction of the tractor body (1), and the slide plates (26) are also provided with a rack meshing with the spur gear (25), and the two soil backfill rakes (7) are respectively connected to the corresponding slide plates (26).

10. A method for treating saline-alkali land, based on the saline-alkali land treating device as described in claim 9, characterized in that: The steps include: Ditching in saline-alkali land by using the ditching mechanism; Sand and gravel are filled into the opened ditch through the sand and gravel storage funnel (2), and the sand and gravel are compacted by the compaction roller (3). At the same time, the sand and gravel are moistened by the water in the water tank (16) so that the sand and gravel form a tight sand and gravel isolation layer; The excavated soil is crushed by the soil crushing rake (6), and finally the crushed soil is backfilled into the upper layer of the sand and gravel isolation layer by the soil backfilling rake (7).

Images