Soil irrigation device based on farmland protection

Abstract

The invention relates to the technical field of soil irrigation, and specifically discloses a soil irrigation device based on farmland protection, comprising a water tank, a plurality of water pipes fixedly connected to the outside of the water tank, a plurality of irrigation components arranged on the outside of the water pipes, solenoid valves fixedly installed on the tops of the water pipes, a plurality of water pumps fixedly installed on the inner wall of the water tank, the water pumps are connected to the water pipes, and the irrigation components comprise a connecting seat, a detection mechanism, a driving mechanism, a clamping mechanism, an irrigation mechanism and a pumping mechanism; the mounting seat is mounted on the outside of the water pipe through the connecting seat and inserted into the soil, which can ensure the stability of the water pipe installation position and monitor the internal humidity of the soil; when the soil water content is high, the movable block is squeezed to move toward the inside of the fixed sleeve, a motor is started to control the opening and closing of the solenoid valve and the water pump, and then the ground mud and water are pumped by the pumping mechanism; when the soil water content is low, the movable block moves outward under the action of the internal pressure, the motor is started to achieve irrigation, so that each area can be automatically monitored and irrigation is implemented to ensure the quality of irrigation.

Description

Technical Field

[0001] The invention relates to the technical field of soil irrigation, in particular to a soil irrigation device based on farmland protection. Background Art

[0002] The moisture content of the land itself will decrease due to factors such as evaporation and plant transpiration. Irrigation can replenish the moisture lost by the soil, maintain a suitable moisture content in the soil, keep the soil in a good state of moisture balance, and dissolve nutrients in the soil, making them into ionic states that can be absorbed by plants, making them easier to be absorbed by plant roots and achieving soil structure transformation.

[0003] In actual application, the existing soil irrigation devices mainly rely on the operator's intuitive observation of the land conditions to determine whether irrigation is needed. This method is extremely simple. It is difficult for the operator to accurately know the details of the moisture inside the land from the surface of the land, which is prone to misjudgment. The result of misjudgment is often that the land as a whole is over-irrigated or under-irrigated, which will have adverse effects on the health of the land and the growth of crops.

[0004] In addition, the land surface is not completely flat, and some areas have depressions and protrusions. When carrying out irrigation operations, this irregularity of the terrain will lead to uneven water distribution. There may be too much water in the depressions, while the protrusions may not get enough water, which greatly reduces the overall irrigation effect and makes it difficult to ensure that the water supply in these special areas reaches the ideal state, making it difficult to ensure the irrigation quality in some areas, which is not conducive to the efficient and sustainable development of agricultural production.

[0005] Therefore, it is necessary to provide a soil irrigation device based on cultivated land protection, aiming to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a soil irrigation device based on farmland protection, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A soil irrigation device based on farmland protection comprises a water tank, the outer side of the water tank is fixedly connected with a plurality of water pipes, the outer side of the water pipes is provided with a plurality of irrigation components, the tops of the water pipes are fixedly installed with solenoid valves, a plurality of water pumps are fixedly installed on the inner wall of the water tank, the water pumps are connected with the water pipes, the irrigation components comprise a connecting seat, a detection mechanism, a driving mechanism, a clamping mechanism, an irrigation mechanism and a pumping mechanism, and the connecting seat is fixedly installed on the outer side of the water pipes;

[0009] The detection mechanism includes a mounting seat fixedly connected to the bottom of the connecting seat, a fixing sleeve fixedly connected inside the mounting seat, a movable block evenly slidably connected inside the mounting seat and the fixing sleeve, a piston slidably connected inside the fixing sleeve, a driving rod fixedly connected to the top of the piston, and a filling liquid filled inside the fixing sleeve;

[0010] The driving mechanism includes a fixed plate fixedly connected to the inside of the mounting seat, a built-in power supply is fixedly installed at the bottom of the fixed plate, a motor is fixedly installed at the top of the fixed plate, the output shaft of the motor is fixedly connected to a threaded rod through a coupling, a connecting block and a movable plate are slidably connected inside the connecting seat, the movable plate is fixedly connected to the top of the connecting block, the connecting block is threadedly connected to the outside of the threaded rod, and the built-in power supply and the motor are electrically connected through a conversion mechanism;

[0011] The irrigation mechanism comprises a connecting rod slidably connected to the top of the movable plate, the top of the connecting seat is fixedly connected to an irrigation pipe, and the top of the connecting rod is fixedly connected to a sealing head;

[0012] The pumping mechanism includes a fixed pipe symmetrically fixedly connected to the inside of the connecting seat, a movable rod symmetrically fixedly connected to the bottom of the movable plate, the movable rod is slidably connected to the fixed pipe through a second spring, and water inlet holes are evenly opened at the bottom of the fixed pipe;

[0013] The motor, the solenoid valve and the water pump are connected by signals.

[0014] As a further improvement of the above solution, the connecting seat further comprises a sealing sleeve evenly and fixedly connected to the inner wall of the fixing sleeve, and the movable block is slidably connected to the inside of the sealing sleeve.

[0015] As a further improvement of the above solution, a sealing ring is evenly and slidably connected inside the mounting seat, a spring 1 is fixedly connected between the sealing ring and the inner wall of the mounting seat, and the spring 1 is fixedly connected to the outer side of the movable block.

[0016] As a further improvement of the above solution, the conversion mechanism includes a protective sleeve fixedly connected to the bottom of the fixed plate, the interior of the protective sleeve is slidably connected to a conversion seat, and the interior of the conversion seat has parallel connecting lines and cross connecting lines fixedly installed.

[0017] As a further improvement of the above scheme, the clamping mechanism includes a connecting sleeve threadedly connected to the top of the mounting seat, the mounting seat is symmetrically slidably connected with a clamping block inside, the top of the clamping block is slidably connected to the connecting sleeve, the outer side of the movable block is provided with an opening, and the outer side of the clamping block is provided with a groove adapted to the movable block.

[0018] As a further improvement of the above solution, the bottom of the fixed tube is fixedly connected to a movable tube, the bottom of the movable rod is slidably connected to the inside of the movable tube, and the second spring is fixedly connected between the movable rod and the fixed tube.

[0019] As a further improvement of the above solution, a sealing tube is symmetrically fixedly connected to the outer side of the connecting seat, and the bottom of the fixed tube is slidably connected to the inside of the sealing tube.

[0020] As a further improvement of the above solution, the bottom of the movable rod is fixedly connected to a limiting ring, and the limiting ring is slidably connected to the inside of the movable tube.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The mounting base is installed on the outside of the water pipe through the connecting base and inserted into the soil, which can not only ensure the stability of the water pipe installation position, but also monitor the internal humidity of the soil. When the soil moisture content is high, the movable block is squeezed to move inside the fixed sleeve, the motor is started, and then the solenoid valve and the water pump are controlled to open and close, and then the ground mud and water are extracted by the pumping mechanism; when the soil moisture content is low, the movable block moves outward under the action of internal pressure, the motor is started, and irrigation is achieved, so that each area can be automatically monitored and irrigation is implemented to ensure the quality of irrigation.

[0023] 2. The conversion seat controls the parallel connection lines and the cross connection lines to realize the electrical connection between the built-in power supply and the motor, and then controls the forward and reverse rotation of the motor output shaft and drives the threaded rod. The forward and reverse rotation of the threaded rod realizes the opening and closing of the irrigation mechanism and the pumping mechanism, completes the switching between pumping and irrigation, ensures the water content of the land, and realizes the protection of the land soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the water tank of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the connecting socket of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the detection mechanism of the present invention;

[0029] Figure 5It is a schematic diagram of the cross-sectional structure of the connecting socket of the present invention;

[0030] Figure 6 For the present invention Figure 5 The structural diagram at A in the middle;

[0031] Figure 7 It is a schematic diagram of the internal structure of the connection block of the present invention;

[0032] Figure 8 For the present invention Figure 7 The structural diagram at B in the middle;

[0033] Fig. 9 It is a partial structural schematic diagram of the driving mechanism of the present invention;

[0034] Fig.10 It is a schematic cross-sectional structure diagram of the conversion seat of the present invention;

[0035] Fig.11 It is a schematic diagram of the internal structure of the protective cover of the present invention.

[0036] In the figure: 1, water tank; 2, water pipe; 3, irrigation assembly; 31, connecting seat; 32, detection mechanism; 321, mounting seat; 322, movable block; 323, sealing sleeve; 324, fixed sleeve; 325, piston; 326, driving rod; 327, spring 1; 328, sealing ring; 33, driving mechanism; 331, connecting block; 332, movable plate; 333, fixed plate; 334, motor; 335, threaded rod; 336, conversion mechanism; 3361, protective sleeve; 3362. conversion seat; 3363. parallel connection line; 3364. cross connection line; 337. built-in power supply; 34. clamping mechanism; 341. connecting sleeve; 342. clamping block; 35. irrigation mechanism; 351. irrigation pipe; 352. connecting rod; 353. sealing head; 36. pumping mechanism; 361. fixed pipe; 362. movable rod; 363. sealing pipe; 364. movable pipe; 365. spring 2; 366. limit ring; 4. solenoid valve; 5. water pump. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 11As shown, the present invention provides an embodiment: a soil irrigation device based on farmland protection, comprising a water tank 1, a plurality of water pipes 2 are fixedly connected to the outside of the water tank 1, a plurality of irrigation components 3 are arranged on the outside of the water pipes 2, a solenoid valve 4 is fixedly installed on the top of each of the water pipes 2, a plurality of water pumps 5 are fixedly installed on the inner wall of the water tank 1, the water pumps 5 are connected to the water pipes 2, the irrigation components 3 include a connecting seat 31, a detection mechanism 32, a driving mechanism 33, a clamping mechanism 34, an irrigation mechanism 35 and a pumping mechanism 36, and the connecting seat 31 is fixedly installed on the outside of the water pipe 2;

[0039] The detection mechanism 32 includes a mounting seat 321 fixedly connected to the bottom of the connecting seat 31, a fixing sleeve 324 is fixedly connected inside the mounting seat 321, a movable block 322 is evenly slidably connected inside the mounting seat 321 and the fixing sleeve 324, a piston 325 is slidably connected inside the fixing sleeve 324, a driving rod 326 is fixedly connected to the top of the piston 325, and the fixing sleeve 324 is filled with a filling liquid;

[0040] The driving mechanism 33 includes a fixed plate 333 fixedly connected to the inside of the mounting seat 321, a built-in power supply 337 is fixedly installed at the bottom of the fixed plate 333, a motor 334 is fixedly installed at the top of the fixed plate 333, the output shaft of the motor 334 is fixedly connected to a threaded rod 335 through a coupling, a connecting block 331 and a movable plate 332 are slidably connected inside the connecting seat 31, the movable plate 332 is fixedly connected to the top of the connecting block 331, the connecting block 331 is threadedly connected to the outside of the threaded rod 335, and the built-in power supply 337 and the motor 334 are electrically connected through a conversion mechanism 336;

[0041] The irrigation mechanism 35 includes a connecting rod 352 slidably connected to the top of the movable plate 332, an irrigation pipe 351 is fixedly connected to the top of the connecting seat 31, and a sealing head 353 is fixedly connected to the top of the connecting rod 352;

[0042] The pumping mechanism 36 includes a fixed pipe 361 symmetrically fixedly connected to the inside of the connecting seat 31, and a movable rod 362 is symmetrically fixedly connected to the bottom of the movable plate 332. The movable rod 362 is slidably connected to the fixed pipe 361 through a spring 365, and water inlet holes are evenly opened at the bottom of the fixed pipe 361;

[0043] The motor 334 , the solenoid valve 4 and the water pump 5 are connected by signals.

[0044] In practical application, the embodiment of the present invention is as follows: Figures 2 to 5 and Fig. 9As shown, when the soil moisture content is low, the dry soil around the mounting seat 321 generates a small inward pressure on the movable block 322, and the driving mechanism 33 is triggered under the coordinated action of the filling liquid in the fixing sleeve 324 and the components such as the piston 325 and the driving rod 326. The conversion mechanism 336 connects the built-in power supply 337 with the motor 334, and the output shaft of the motor 334 drives the threaded rod 335 to rotate, and the connecting block 331 threadedly connected to the threaded rod 335 and the movable plate 332 fixed thereon move upward along the threaded rod 335. The movable plate 332 drives the connecting rod 352 and the sealing head 353 to move upward, so that a gap is formed between the sealing head 353 and the irrigation pipe 351, and at the same time, the water pump 5 is started, the solenoid valve 4 is closed, and the water in the water tank 1 is filled in the water pipe 2, and enters the irrigation pipe 351 through the connecting seat 31, and finally sprays out from the gap between the sealing head 353 and the irrigation pipe 351, so as to irrigate the soil and increase the soil moisture content;

[0045] like Figures 2 to 7 As shown, when the soil moisture content is high, the moist soil generates a large inward pressure on the movable block 322. Through the above-mentioned mechanical transmission and circuit triggering mechanism, the output shaft of the motor 334 reverses, driving the threaded rod 335 to reverse, so that the movable plate 332 and its related components move downward. At this time, the sealing head 353 and the irrigation pipe 351 are closed to prevent water from spraying out (wherein, the solenoid valve 4 is opened, and the water flows through the connecting seat 31. The water flows through the connecting seat 31 accelerates inside, further driving the sealing head 353 and the irrigation pipe 351 to close); and the movable plate 332 drives the movable rod 362 to move downward, the spring 2 365 is compressed, and the water inlet hole at the bottom of the fixed pipe 361 is opened. Under the action of the water pump 5, the muddy water in the soil enters the fixed pipe 361 through the water inlet hole, and is then pumped into the water tank 1 through the connecting seat 31 and other channels, so as to extract the excess water in the soil, thereby maintaining the appropriate water content of the soil and achieving the purpose of protecting the cultivated land.

[0046] like Figure 8 As shown, the connecting seat 31 further includes a sealing sleeve 323 evenly fixedly connected to the inner wall of the fixing sleeve 324 , and the movable block 322 is slidably connected to the inside of the sealing sleeve 323 .

[0047] In actual application of the embodiment of the present invention, when the change in soil moisture content causes the movable block 322 to move, the sealing sleeve 323 ensures that the sliding connection between the movable block 322 and the inner wall of the fixed sleeve 324 is in a good sealing state.

[0048] like Figure 8 As shown, a sealing ring 328 is evenly and slidably connected inside the mounting seat 321 , a spring 327 is fixedly connected between the sealing ring 328 and the inner wall of the mounting seat 321 , and the spring 327 is fixedly connected to the outer side of the movable block 322 .

[0049] In actual application of the embodiment of the present invention, when soil moisture changes and causes the movable block 322 to move, the spring 1 327 provides elastic support and buffering for the movable block 322 .

[0050] like Figures 9 to 11 As shown, the conversion mechanism 336 includes a protective sleeve 3361 fixedly connected to the bottom of the fixed plate 333, the interior of the protective sleeve 3361 is slidably connected to a conversion seat 3362, and the interior of the conversion seat 3362 is fixedly installed with parallel connection lines 3363 and cross connection lines 3364.

[0051] In actual application of the embodiment of the present invention, when it is necessary to control the forward and reverse rotation of the output shaft of the motor 334 to realize the switching operation of the irrigation mechanism 35 and the pumping mechanism 36, the conversion seat 3362 slides in the protective cover 3361 to change the connection relationship between the parallel connection line 3363 and the cross connection line 3364 and the built-in power supply 337 and the motor 334.

[0052] like Figure 4 As shown, the clamping mechanism 34 includes a connecting sleeve 341 threadedly connected to the top of the mounting seat 321, the mounting seat 321 is internally symmetrically slidably connected with a clamping block 342, the top of the clamping block 342 is slidably connected to the connecting sleeve 341, the outer side of the movable block 322 is provided with an opening, and the outer side of the clamping block 342 is provided with a groove adapted to the movable block 322.

[0053] When the embodiment of the present invention is actually used, before the mounting seat 321 is inserted into the soil, the connecting sleeve 341 is rotated to drive the clamping block 342 to realize the clamping of the position of the movable block 322, ensuring the stable insertion of the mounting seat 321. After the mounting seat 321 is inserted into the soil, the clamping block 342 is reset so that the movable block 322 can move under pressure.

[0054] like Figure 6 As shown, the bottom of the fixed tube 361 is fixedly connected to the movable tube 364 , the bottom of the movable rod 362 is slidably connected to the inside of the movable tube 364 , and the second spring 365 is fixedly connected between the movable rod 362 and the fixed tube 361 .

[0055] In actual application of the embodiment of the present invention, when the motor 334 drives the movable plate 332 to move according to the soil moisture content, the movable rod 362 fixed at the bottom of the movable plate 332 slides inside the movable tube 364. When the soil moisture content is high and water needs to be pumped out, the movable plate 332 moves downward, and the movable rod 362 slides downward in the movable tube 364 and compresses the spring 2 365. During this process, the movable tube 364 and the fixed tube 361 work together to ensure that the water inlet hole at the bottom of the fixed tube 361 is opened smoothly, so that the muddy water in the soil can stably pass through the water inlet hole. It enters the fixed pipe 361 and is then pumped into the water tank 1 through the connecting seat 31 and other components; when the motor 334 reverses to move the movable plate 332 upward, the spring 2 365 stretches, and the movable rod 362 moves upward in the movable pipe 364. The movable pipe 364 helps to maintain the air pressure stability inside the entire pumping mechanism 36 and the normal closure of the water flow channel, preventing muddy water from flowing back or external impurities from entering when the water is not pumped, thereby ensuring that the pumping mechanism 36 can respond to changes in soil moisture content efficiently and accurately, achieve effective regulation of soil moisture, and protect the cultivated soil environment.

[0056] like Figure 6 As shown, a sealing tube 363 is symmetrically fixedly connected to the outer side of the connecting seat 31 , and the bottom of the fixing tube 361 is slidably connected to the inside of the sealing tube 363 .

[0057] In practical application of the embodiment of the present invention, the sealing tube 363 can seal the bottom of the connection seat 31 when the water pumping is not turned on to ensure the internal sealing.

[0058] like Figure 6 As shown, the bottom of the movable rod 362 is fixedly connected to a limiting ring 366 , and the limiting ring 366 is slidably connected to the inside of the movable tube 364 .

[0059] When the embodiment of the present invention is actually used, the moving stroke of the movable tube 364 can be limited by the limiting ring 366 .

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil irrigation device based on farmland protection, comprising a water tank (1), characterized in that: The outside of the water tank (1) is fixedly connected to a plurality of water pipes (2), the outside of the water pipes (2) is provided with a plurality of irrigation components (3), the top of each of the water pipes (2) is fixedly mounted with a solenoid valve (4), the inner wall of the water tank (1) is fixedly mounted with a plurality of water pumps (5), the water pumps (5) are connected to the water pipes (2), the irrigation components (3) comprise a connection seat (31), a detection mechanism (32), a driving mechanism (33), a clamping mechanism (34), an irrigation mechanism (35) and a pumping mechanism (36), the connection seat (31) is fixedly mounted on the outside of the water pipes (2); The detection mechanism (32) comprises a mounting seat (321) fixedly connected to the bottom of the connecting seat (31); a fixing sleeve (324) is fixedly connected inside the mounting seat (321); a movable block (322) is evenly slidably connected inside the mounting seat (321) and the fixing sleeve (324); a piston (325) is slidably connected inside the fixing sleeve (324); a driving rod (326) is fixedly connected to the top of the piston (325); and a filling liquid is filled inside the fixing sleeve (324); The driving mechanism (33) comprises a fixing plate (333) fixedly connected to the inside of the mounting seat (321); a built-in power source (337) is fixedly installed on the bottom of the fixing plate (333); a motor (334) is fixedly installed on the top of the fixing plate (333); an output shaft of the motor (334) is fixedly connected to a threaded rod (335) via a coupling; a connecting block (331) and a movable plate (332) are slidably connected inside the connecting seat (31); the movable plate (332) is fixedly connected to the top of the connecting block (331); the connecting block (331) is threadedly connected to the outside of the threaded rod (335); and the built-in power source (337) and the motor (334) are electrically connected via a conversion mechanism (336); The irrigation mechanism (35) comprises a connecting rod (352) slidably connected to the top of the movable plate (332); the top of the connecting seat (31) is fixedly connected to an irrigation pipe (351); and the top of the connecting rod (352) is fixedly connected to a sealing head (353); The pumping mechanism (36) comprises a fixed tube (361) symmetrically fixedly connected to the inside of the connecting seat (31); a movable rod (362) is symmetrically fixedly connected to the bottom of the movable plate (332); the movable rod (362) is slidably connected to the fixed tube (361) via a second spring (365); and water inlet holes are evenly opened at the bottom of the fixed tube (361); The motor (334), the solenoid valve (4) and the water pump (5) are signal-connected.

2. The soil irrigation device based on farmland protection according to claim 1 is characterized in that: The connecting seat (31) further comprises a sealing sleeve (323) which is evenly fixedly connected to the inner wall of the fixed sleeve (324), and the movable block (322) is slidably connected to the interior of the sealing sleeve (323).

3. The soil irrigation device based on farmland protection according to claim 2 is characterized in that: The interior of the mounting seat (321) is evenly and slidably connected with a sealing ring (328), a spring 1 (327) is fixedly connected between the sealing ring (328) and the inner wall of the mounting seat (321), and the spring 1 (327) is fixedly connected to the outer side of the movable block (322).

4. The soil irrigation device based on farmland protection according to claim 2 is characterized in that: The conversion mechanism (336) comprises a protective sleeve (3361) fixedly connected to the bottom of the fixed plate (333); a conversion seat (3362) is slidably connected inside the protective sleeve (3361); and parallel connection lines (3363) and cross connection lines (3364) are fixedly installed inside the conversion seat (3362).

5. The soil irrigation device based on farmland protection according to claim 2 is characterized in that: The clamping mechanism (34) comprises a connecting sleeve (341) threadedly connected to the top of the mounting seat (321); a clamping block (342) is symmetrically slidably connected inside the mounting seat (321); the top of the clamping block (342) is slidably connected to the connecting sleeve (341); an opening is provided on the outside of the movable block (322); and a groove matching the movable block (322) is provided on the outside of the clamping block (342).

6. The soil irrigation device based on farmland protection according to claim 2, characterized in that: The bottom of the fixed tube (361) is fixedly connected to a movable tube (364), the bottom of the movable rod (362) is slidably connected to the inside of the movable tube (364), and the second spring (365) is fixedly connected between the movable rod (362) and the fixed tube (361).

7. The soil irrigation device based on farmland protection according to claim 3 is characterized in that: The outer side of the connection seat (31) is symmetrically fixedly connected with a sealing tube (363), and the bottom of the fixed tube (361) is slidably connected to the inside of the sealing tube (363).

8. The soil irrigation device based on farmland protection according to claim 3 is characterized in that: The bottom of the movable rod (362) is fixedly connected to a limiting ring (366), and the limiting ring (366) is slidably connected to the inside of the movable tube (364).

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