A high-standard farmland water conservancy irrigation system

Abstract

The application belongs to the field of farmland irrigation technology and discloses a high-standard farmland water conservancy irrigation system which comprises a water supply station and a plurality of irrigation devices in communication with the water supply station through water supply pipes, wherein the irrigation device comprises a water inlet tank in communication with a water supply pump through a water supply pipe, a hollow pipe rotatably connected to the upper end of the water inlet tank, an elbow pipe connected to the upper end of the hollow pipe, an irrigation pipe connected to the upper end of the elbow pipe, a swing arm irrigation mechanism arranged at the lower end of the irrigation pipe, a rotating block arranged on the outer wall of the hollow pipe, a swing irrigation mechanism arranged on one side of the rotating block for driving the irrigation pipe to swing horizontally, and a pulse irrigation mechanism arranged on the other side of the rotating block. The application realizes the purpose of precise irrigation of standardized farmland, discards the traditional rough and wasteful irrigation mode of water resources, further guarantees the irrigation range of the irrigation device, meets the irrigation needs of the standardized farmland, resets and blocks the irrigation water sprayed by the nozzle, and further guarantees the irrigation range of the sprayed water.

Description

Technical Field

[0001] This invention relates to the field of farmland irrigation technology, specifically a high-standard farmland water conservancy irrigation system. Background Technology

[0002] The construction of high-standard farmland is an important measure to ensure national food security and enhance comprehensive agricultural production capacity. Irrigation systems, as the core supporting facilities for high-standard farmland, directly determine farmland output and water resource utilization efficiency. my country faces a prominent contradiction between agricultural water supply and demand, with agricultural irrigation water accounting for a large proportion of total social water consumption. Developing water-saving, balanced, and intelligent farmland irrigation systems is of significant practical importance for achieving stable and increased agricultural production and promoting water conservation and efficiency in agriculture.

[0003] Currently, most high-standard farmland irrigation methods adopt flood irrigation, fixed sprinkler irrigation, or drip irrigation. Flood irrigation results in high water consumption, low irrigation water use efficiency, and is prone to deep soil seepage and water and fertilizer loss. Fixed sprinkler and drip irrigation pipelines have fixed layouts, and the water output parameters of the sprinklers cannot be flexibly adjusted. When faced with undulating terrain, changes in crop types, or variations in planting row spacing, problems such as local over-irrigation and local water shortage are likely to occur, resulting in poor irrigation uniformity.

[0004] Therefore, there is an urgent need to develop a water conservancy irrigation system that is suitable for high-standard field operations in order to solve the shortcomings of the existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a high-standard farmland irrigation system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-standard farmland irrigation system includes a water supply station and multiple irrigation devices connected to the water supply station via a water delivery pipe. The water supply station includes a main water supply pipe with multiple water distribution valves connected to it and water pumps connected to the water distribution valves. The irrigation devices include an inlet tank connected to the water pump via a water delivery pipe. A hollow pipe is rotatably connected to the upper end of the inlet tank. An elbow pipe is connected to the upper end of the hollow pipe, and an irrigation pipe is connected to the upper end of the elbow pipe. A rocker arm irrigation mechanism is provided at the lower end of the irrigation pipe. A rotating block is installed on the outer wall of the hollow pipe. A swing irrigation mechanism for driving the irrigation pipe to swing horizontally is provided on one side of the rotating block, and a pulse irrigation mechanism is provided on the other side of the rotating block.

[0007] As an improvement of the present invention: the water supply station further includes a control cabinet, which is electrically connected to the water distribution valve and the water pump. A pressurization pipe is also connected to the main water supply pipeline, and a pressurization tank is connected to the pressurization pipe.

[0008] As an improvement of the present invention: the swing irrigation mechanism includes a motor frame symmetrically mounted on the outer wall of the rotating block, a drive assembly mounted on the motor frame, the input end of the drive assembly connected to the drive motor, the output end of the drive assembly connected to a rotating shaft, the other end of the rotating shaft rotatably mounted on the rotating block, a rotating gear fixedly mounted on the rotating shaft, and a fixed gear ring fixed on the water inlet tank meshing with the lower side of the rotating gear.

[0009] As an improvement of the present invention: the drive assembly includes a drive box mounted on a motor frame, a drive shaft rotatably mounted inside the drive box, one end of the drive shaft being connected to the output end of a drive motor, a forward gear and a reverse gear mounted on the drive shaft, a swing gear meshing between the forward gear and the reverse gear, and a rotating shaft fixedly mounted on the swing gear.

[0010] As an improvement of the present invention: the pulse irrigation mechanism includes a pulse box mounted on a rotating block, one end of the pulse box is connected to a hollow pipe through an inlet pipe, and the other end is connected to an elbow pipe through an outlet pipe. The pulse irrigation mechanism also includes a pulse irrigation component.

[0011] As an improvement of the present invention: the pulse irrigation assembly includes a rotating gear rotatably mounted on the outer side of the upper end of the hollow tube, the outer side of the rotating gear meshing with the upper end of the rotating gear, a rotating rod hinged to the eccentric position of the upper end of the rotating gear, a connecting column hinged to the rotating rod, a pulse column fixedly mounted on the connecting column, and a pulse plug slidably disposed inside the pulse box, the pulse column passing through the pulse box.

[0012] As an improvement of the present invention: a nozzle is detachably installed at the end of the irrigation pipe away from the elbow pipe, the lower edge of the nozzle is detachably installed on the elbow pipe via a pull rod, an atomizing shaft is detachably installed on the side wall of the nozzle, a limit wheel is slidably installed on the atomizing shaft, and an atomizing needle is installed at the end of the atomizing shaft via a threaded structure.

[0013] As an improvement of the present invention: the rocker arm irrigation mechanism includes a fixed cylinder that is detachably installed at the lower end of the irrigation pipe. A horizontal cylinder is fixedly installed at the front end of the fixed cylinder. A rocker arm frame is rotatably installed on the horizontal cylinder through a reset component. A water-blocking block is fixedly installed at the front end of the rocker arm frame. A fixed plate is fixedly installed at the rear end of the fixed cylinder. A step block is installed on the fixed plate through a locking part. The step block is in contact with and cooperates with the rear end of the rocker arm frame.

[0014] As an improvement of the present invention: the reset assembly includes a reset cylinder rotatably installed on the inner side of the rocker arm frame. The reset cylinder is installed at one end of the horizontal cylinder by a reset torsion spring. The outer wall of the reset cylinder near the rocker arm frame is provided with a plurality of limiting rings, and the limiting rings are engaged with the limiting posts that are provided through the rocker arm frame.

[0015] As an improvement of the present invention: the locking part includes a locking cylinder rotatably installed at the end of the fixed plate, and a locking block is slidably installed inside the locking cylinder by a locking spring, with the end of the locking block away from the locking spring abutting against the inner wall of the step block.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up water supply stations and multiple irrigation devices, the goal of precise irrigation of standardized farmland is achieved, abandoning the traditional, rough and wasteful irrigation methods. At the same time, the swing irrigation mechanism in the irrigation device further ensures the irrigation range of the irrigation device and meets the irrigation needs of standardized farmland. 2. By setting up a rocker arm irrigation mechanism, the irrigation water sprayed from the nozzle is interrupted by a reset mechanism, thereby ensuring the irrigation range of the sprayed water. At the same time, a pulse irrigation mechanism is set up to further ensure the spraying distance of the irrigation water. It is highly practical and reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a front view schematic diagram of the workstation structure in this invention; Figure 3 This is a schematic diagram of the rear view structure of the workstation in this invention; Figure 4 This is a front view schematic diagram of the irrigation device in this invention; Figure 5 This is a bottom view of the irrigation device in this invention. Figure 6 This is a schematic diagram of the overall installation structure of the hollow tube in this invention; Figure 7 This is a schematic diagram of the internal installation structure of the hollow tube in this invention; Figure 8 This is a schematic diagram of the driving component in this invention; Figure 9 This is a schematic diagram of the installation structure of the rocker arm in this invention; Figure 10 This is a schematic diagram of the installation structure of the irrigation pipe in this invention; Figure 11 This is a schematic diagram of the installation structure of the fixed cylinder in this invention; Figure 12 This is a schematic diagram of the locking part in this invention; Figure 13 This is a schematic diagram of the reset component in this invention.

[0018] In the diagram: 1. Pressure tank; 2. Main water supply pipe; 3. Control cabinet; 4. Pressure pipe; 5. Water delivery pipe; 6. Mounting base; 7. Inlet tank; 8. Divider valve; 9. Water pump; 10. Mounting column; 11. Hollow pipe; 12. Irrigation pipe; 13. Elbow pipe; 14. Drive box; 15. Water baffle; 16. Drive motor; 17. Motor frame; 18. Fixed gear ring; 19. Rotating gear; 20. Rotating block; 21. Rotating gear; 22. Outlet pipe; 23. Inlet pipe; 24. Pulse box; 25. Pulse column; 2 6. Connecting post; 27. Rotating rod; 28. Pulse plug; 29. ​​Rotating shaft; 30. Drive shaft; 31. Forward gear; 32. Reverse gear; 33. Swing gear; 34. Nozzle; 35. Rocker arm; 36. Fixed cylinder; 37. Fixed plate; 38. Step block; 39. Limiting wheel; 40. Atomizing needle; 41. Atomizing shaft; 42. Pull rod; 43. Horizontal cylinder; 44. Return torsion spring; 45. Return cylinder; 46. Locking cylinder; 47. Locking spring; 48. Locking block; 49. Limiting post; 50. Limiting ring. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1: See Figures 1 to 13 In this embodiment of the invention, a high-standard farmland irrigation system includes a water supply station and multiple irrigation devices connected to the water supply station via a water delivery pipe 5. The water supply station includes a main water supply pipe 2, on which multiple water distribution valves 8 are connected and installed. Each water distribution valve 8 is connected and installed with a water delivery pump 9. In actual installation, the main water supply pipe 2 is connected to the main water supply line, and the irrigation water is introduced into the corresponding water delivery pump 9 through each water distribution valve 8.

[0021] In addition, this water supply station also includes a control cabinet 3, which is electrically connected to the water distribution valve 8 and the water pump 9. A pressurization pipe 4 is also connected to the main water supply pipeline 2, and a pressurization tank 1 is connected to the pressurization pipe 4. Using the pressurization tank 1, the irrigation water entering the water supply pipeline 5 can be pressurized to a certain pressure, thus ensuring the irrigation range of the entire irrigation system. Simultaneously, under the control of the control cabinet 3, each water distribution valve 8 and the water pump 9 can be controlled, enabling precise differentiated irrigation for high-standard farmland requiring water.

[0022] Specifically, this irrigation device includes an inlet tank 7 connected to a water pump 9 via a water supply pipe 5. A mounting base 6 is fixed to the bottom of the inlet tank 7, and multiple mounting posts 10 are inserted into the four corners of the mounting base 6, thereby effectively installing the irrigation device in the farmland.

[0023] Meanwhile, a hollow pipe 11 is rotatably connected to the upper end of the water inlet tank 7. An elbow pipe 13 is connected to the upper end of the hollow pipe 11, and an irrigation pipe 12 is connected to the upper end of the elbow pipe 13. A nozzle 34 is detachably installed at the end of the irrigation pipe 12 away from the elbow pipe 13. The lower edge of the nozzle 34 is detachably installed on the elbow pipe 13 via a pull rod 42. The water supply pipe 5 guides the irrigation water from the water supply station into the water inlet tank 7 via the water pump 9, then through the hollow pipe 11 and into the elbow pipe 13, and finally into the irrigation pipe 12, where it is sprayed out through the nozzle 34, thereby achieving the purpose of irrigating high-standard farmland.

[0024] In this embodiment, to further ensure the irrigation effect of the nozzle 34, a rocker arm irrigation mechanism is provided at the lower end of the irrigation pipe 12. Specifically, the rocker arm irrigation mechanism includes a fixed cylinder 36 that is detachably installed at the lower end of the irrigation pipe 12. A horizontal cylinder 43 is fixedly installed at the front end of the fixed cylinder 36. A rocker arm frame 35 is rotatably installed at one end of the horizontal cylinder 43 through a reset component, and the other end is directly rotatably installed on the rocker arm frame 35. At the same time, a water-blocking block 15 is fixedly installed at the front end of the rocker arm frame 35, and a fixed plate 37 is fixedly installed at the rear end of the fixed cylinder 36. A foot block 38 is installed on the fixed plate 37 through a locking part. The foot block 38 contacts and cooperates with the rear end of the rocker arm frame 35, thereby limiting the up and down swing position of the rocker arm frame 35.

[0025] The reset assembly includes a reset cylinder 45 rotatably mounted inside the rocker arm 35. Inside the reset cylinder 45, a reset torsion spring 44 is mounted to one end of a horizontal cylinder 43. Multiple limiting rings 50 are provided on the outer wall of the reset cylinder 45 near the rocker arm 35, and these limiting rings 50 engage with limiting posts 49 that penetrate the rocker arm 35. After being impacted by the high-pressure water from the nozzle 34, the water-blocking block 15 moves downwards under gravity. Then, the reset assembly causes the water-blocking block 15 to move upwards again under the action of the reset torsion spring 44. This process repeats, thus blocking the water from the nozzle 34 for a certain period, ultimately creating a continuous spray range, increasing the irrigation area and further ensuring irrigation quality.

[0026] In addition, to ensure effective buffering installation of the foot block 38 at the tail of the fixed plate 37, this locking part includes a locking cylinder 46 rotatably mounted at the end of the fixed plate 37. A locking block 48 is slidably mounted inside the locking cylinder 46 via a locking spring 47, with the end of the locking block 48 away from the locking spring 47 abutting against the inner wall of the foot block 38. This arrangement reduces the impact on the foot block 38 after the tail of the rocker arm 35 makes limited contact with it, thus ensuring the service life of the foot block 38.

[0027] Furthermore, to further ensure the horizontal irrigation range of the nozzle 34 when irrigating farmland, a rotating block 20 is installed on the outer wall of the hollow tube 11. A swing irrigation mechanism for driving the irrigation pipe 12 to swing horizontally is provided on one side of the rotating block 20. Specifically, the swing irrigation mechanism includes a motor frame 17 symmetrically installed on the outer wall of the rotating block 20. A drive assembly is installed on the motor frame 17. The input end of the drive assembly is connected to the drive motor 16, and the output end of the drive assembly is connected to a rotating shaft 29. The other end of the rotating shaft 29 is rotatably installed on the rotating block 20. A rotating gear 19 is fixedly installed on the rotating shaft 29, and a fixed gear ring 18 fixed on the water inlet tank 7 meshes with the lower side of the rotating gear 19.

[0028] The drive assembly includes a drive box 14 mounted on a motor frame 17. A drive shaft 30 is rotatably mounted inside the drive box 14. One end of the drive shaft 30 is connected to the output end of the drive motor 16. A forward gear 31 and a reverse gear 32 are also mounted on the drive shaft 30. A swing gear 33 meshes between the forward gear 31 and the reverse gear 32. A rotating shaft 29 is fixedly mounted on the swing gear 33.

[0029] To ensure that the entire irrigation pipe 12 can reciprocate approximately 180° horizontally, the forward gear 31 and the reverse gear 32 are both half-tooth gears with their teeth arranged in opposite directions, while the oscillating gear 33 is a full-tooth gear. This configuration allows the drive motor 16 to rotate the forward gear 31 and the reverse gear 32 via the drive shaft 30. The half-tooth structures on these gears alternately mesh with the full-tooth structure of the oscillating gear 33, causing the rotating shaft 29 to reciprocate 180°. Ultimately, this drives the rotating gear 19 to rotate synchronously clockwise and counterclockwise.

[0030] The working principle of the above-mentioned swing irrigation mechanism is as follows: When the rotating gear 19 is driven by the drive assembly to reciprocate along the rotating shaft 29, since the rotating gear 19 is meshed with the fixed gear ring 18 in the fixed state, under the rotation limit of the hollow tube 11, the entire rotating block 20 moves horizontally back and forth 180° along the axis of the hollow tube 11, so that the nozzle 34 on the irrigation pipe 12 can swing left and right when spraying irrigation water, thereby ensuring the irrigation range.

[0031] In addition, to further ensure the irrigation spray distance, a pulse irrigation mechanism is also provided on the other side of the rotating block 20. This pulse irrigation mechanism includes a pulse box 24 installed on the rotating block 20. One end of the pulse box 24 is connected to the hollow pipe 11 through the inlet pipe 23, and the other end is connected to the elbow pipe 13 through the outlet pipe 22. At the same time, in order to ensure the unidirectional flow of irrigation water inside the pulse box 24, a one-way valve is also provided inside the outlet pipe 22 and the inlet pipe 23. The pulse irrigation mechanism also includes a pulse irrigation component.

[0032] The pulse irrigation assembly includes a rotating gear 21 rotatably mounted on the outer side of the upper end of the hollow tube 11. The outer side of the rotating gear 21 meshes with the upper end of the rotating gear 19. A rotating rod 27 is hinged to the upper end of the rotating gear 21 at an eccentric position. A connecting column 26 is hinged to the rotating rod 27. A pulse column 25 is fixedly mounted on the connecting column 26. The pulse column 25 passes through the pulse box 24 and is connected to a pulse plug 28 that is slidably disposed inside the pulse box 24.

[0033] The working principle of the above-mentioned pulse irrigation mechanism is as follows: When the rotating gear 19 rotates, since the rotating gear 21 and the rotating gear 19 are meshed with each other, the rotating gear 21 will rotate synchronously. Then, under the action of the rotating rod 27, the connecting column 26 will drive the pulse column 25 to drive the pulse plug 28 to move back and forth inside the pulse box 24. Then, the soy sauce inlet pipe 23 will draw the irrigation water inside the hollow pipe 11 into the pulse box 24. After being pressurized, it will be introduced into the elbow pipe 13 through the outlet pipe 22. Thus, the water sprayed through the irrigation pipe 12 and the nozzle 34 will have a certain pressure pulse force, which will ultimately increase the spray distance of the irrigation water.

[0034] Example 2: In another embodiment of the present invention, the difference between this embodiment and the above embodiment is that the nozzle 34 is detachably mounted with an atomizing shaft 41, and a limiting wheel 39 is slidably mounted on the atomizing shaft 41. The outer wall of the limiting wheel 39 is in contact with one side of the inner wall of the rocker arm 35, thereby ensuring that the rocker arm 35 will not shake when swinging up and down. In addition, an atomizing needle 40 is installed at the end of the atomizing shaft 41 through a threaded structure, thereby ensuring that the water sprayed through the nozzle 34 can produce a certain range of atomization, further ensuring the irrigation quality.

[0035] In summary, during actual irrigation, multiple irrigation devices are first installed in corresponding positions according to the specific irrigation area. Then, they are connected to the corresponding water pumps 9 at the water supply station via water pipes 5. When it is determined that an area needs irrigation, the corresponding water pumps 9 and water distribution valves 8 are opened, and water flows into the corresponding irrigation devices. Then, with the cooperation of the swing irrigation mechanism, pulse irrigation mechanism, and rocker arm irrigation mechanism, the irrigation range of the water sprayed from the nozzles 34 is ensured, thereby ultimately guaranteeing the irrigation quality of high-standard farmland water conservancy.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-standard farmland irrigation system, comprising a water supply station and multiple irrigation devices connected to the water supply station via a water transmission pipe (5), characterized in that, The water supply station includes a main water supply pipeline (2), and multiple water distribution valves (8) are connected to the main water supply pipeline (2). A water pump (9) is connected to the water distribution valves (8). The irrigation device includes an inlet tank (7) connected to the water pump (9) via a water supply pipe (5). A hollow pipe (11) is rotatably connected to the upper end of the inlet tank (7). An elbow pipe (13) is connected to the upper end of the hollow pipe (11). An irrigation pipe (12) is connected to the upper end of the elbow pipe (13). A rocker arm irrigation mechanism is provided at the lower end of the irrigation pipe (12). A rotating block (20) is installed on the outer wall of the hollow pipe (11). A swing irrigation mechanism for driving the irrigation pipe (12) to swing horizontally is provided on one side of the rotating block (20). A pulse irrigation mechanism is also provided on the other side of the rotating block (20).

2. The high-standard farmland irrigation system according to claim 1, characterized in that, The water supply station also includes a control cabinet (3), which is electrically connected to the water distribution valve (8) and the water pump (9). A pressurization pipe (4) is also connected to the main water supply pipeline (2), and a pressurization tank (1) is connected to the pressurization pipe (4).

3. The high-standard farmland irrigation system according to claim 1, characterized in that, The swing irrigation mechanism includes a motor frame (17) symmetrically mounted on the outer wall of the rotating block (20). A drive assembly is mounted on the motor frame (17). The input end of the drive assembly is connected to the drive motor (16). The output end of the drive assembly is connected to a rotating shaft (29). The other end of the rotating shaft (29) is rotatably mounted on the rotating block (20). A rotating gear (19) is fixedly mounted on the rotating shaft (29). A fixed gear ring (18) fixed on the water inlet tank (7) meshes with the lower side of the rotating gear (19).

4. A high-standard farmland irrigation system according to claim 3, characterized in that, The drive assembly includes a drive box (14) mounted on a motor frame (17). A drive shaft (30) is rotatably mounted inside the drive box (14). One end of the drive shaft (30) is connected to the output end of a drive motor (16). A forward gear (31) and a reverse gear (32) are also mounted on the drive shaft (30). A swing gear (33) meshes between the forward gear (31) and the reverse gear (32). A rotating shaft (29) is fixedly mounted on the swing gear (33).

5. A high-standard farmland irrigation system according to claim 4, characterized in that, The pulse irrigation mechanism includes a pulse box (24) mounted on a rotating block (20). One end of the pulse box (24) is connected to the hollow pipe (11) through an inlet pipe (23), and the other end is connected to the elbow pipe (13) through an outlet pipe (22). The pulse irrigation mechanism also includes a pulse irrigation component.

6. A high-standard farmland irrigation system according to claim 5, characterized in that, The pulse irrigation assembly includes a rotating gear (21) rotatably mounted on the outer side of the upper end of the hollow tube (11). The outer side of the rotating gear (21) meshes with the upper end of the rotating gear (19). A rotating rod (27) is hinged to the upper end of the rotating gear (21) at an eccentric position. A connecting column (26) is hinged to the rotating rod (27). A pulse column (25) is fixedly mounted on the connecting column (26). The pulse column (25) passes through the pulse box (24) and is connected to a pulse plug (28) that is slidably disposed inside the pulse box (24).

7. A high-standard farmland irrigation system according to claim 1, characterized in that, A nozzle (34) is detachably installed at the end of the irrigation pipe (12) away from the elbow pipe (13). The lower edge of the nozzle (34) is detachably installed on the elbow pipe (13) via a pull rod (42). An atomizing shaft (41) is detachably installed on the side wall of the nozzle (34). A limit wheel (39) is slidably installed on the atomizing shaft (41). An atomizing needle (40) is installed at the end of the atomizing shaft (41) via a threaded structure.

8. A high-standard farmland irrigation system according to claim 6, characterized in that, The rocker arm irrigation mechanism includes a fixed cylinder (36) that is detachably installed at the lower end of the irrigation pipe (12). A horizontal cylinder (43) is fixedly installed at the front end of the fixed cylinder (36). A rocker arm frame (35) is rotatably installed on the horizontal cylinder (43) through a reset assembly. A water-blocking block (15) is fixedly installed at the front end of the rocker arm frame (35). A fixed plate (37) is fixedly installed at the rear end of the fixed cylinder (36). A foot block (38) is installed on the fixed plate (37) through a locking part. The foot block (38) is in contact with the rear end of the rocker arm frame (35).

9. A high-standard farmland irrigation system according to claim 8, characterized in that, The reset assembly includes a reset cylinder (45) rotatably mounted inside the rocker arm (35). The reset cylinder (45) is mounted on one end of the horizontal cylinder (43) via a reset torsion spring (44). The outer wall of the reset cylinder (45) near the rocker arm (35) is provided with multiple limiting rings (50). The limiting rings (50) are engaged with the limiting posts (49) that are provided through the rocker arm (35).

10. A high-standard farmland irrigation system according to claim 9, characterized in that, The locking part includes a locking cylinder (46) rotatably mounted at the end of the fixed plate (37). A locking block (48) is slidably mounted inside the locking cylinder (46) via a locking spring (47). The end of the locking block (48) away from the locking spring (47) abuts against the inner wall of the step block (38).

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