Water pH value detection device for crop planting

Abstract

The utility model belongs to the technical field of agricultural planting, particularly relates to a water pH value detection device for crop planting, and provides the following scheme aiming at the problems that detection equipment is inconvenient to clean and detection results are easy to have errors: the water pH value detection device comprises a detection base, a pH value tester body, a pressing rod assembly and a flushing assembly, the acid-base property tester is provided with the flushing groove position and the detection groove positions, water body samples in different areas can be placed in the detection groove positions when the acid-base property tester is operated and used, acid-base property detection of a plurality of water body samples can be conveniently carried out, and due to the fact that the flushing groove position is arranged, the acid-base property tester body can be flushed after each time of detection is completed. Wastewater generated after each time of flushing can be discharged through the drainage pipe, so that the subsequent detection accuracy is prevented from being influenced; the movable pressing rod of the pressing rod assembly can be slowly lifted up firstly, equivalently, the placement time of the acid-base property tester body in the water body sample to be tested is prolonged, and accurate measurement is realized.

Description

Technical Field

[0001] The utility model relates to a detection device, in particular to a device for detecting the pH value of water for crop planting, belonging to the technical field of agricultural planting. Background Art

[0002] Water is essential in the process of crop cultivation. For example, when planting crops such as oats or potatoes, watering operations such as irrigation are required during the planting period to ensure the normal growth of crops such as oats or potatoes. It is crucial to test the pH of water bodies to maintain the appropriate pH of the water bodies. Therefore, water bodies in areas where crops such as oats or potatoes are planted often need to be sampled for pH testing.

[0003] In the prior art, there is a water sample pH detection device disclosed in the announcement number CN210269800U; the rotation of the transmission roller can drive the transmission belt to rotate relatively to move the movable plate, thereby facilitating the movement of multiple groups of water samples on the transmission belt, and facilitating the replacement of the water samples after detection, effectively reducing its usage limitations, with high work efficiency and bringing convenience to users; and the cleaning motor can drive the cleaning plate and the detector to rotate at the same time, so as to wipe and clean its surface with a sponge pad, and its working modes are relatively diverse, which is convenient for cleaning the surface of the detector after the detection is completed, so as to prevent the detection result of the device from being affected during the secondary detection, and the use effect is strong, thereby improving its reliability, but In actual operation, although the existing technology can test multiple groups of water samples, the acid-base detector needs to clean the detection part after each test to ensure that the pH of the water sample can be accurately detected the next time it is used. The existing detection equipment can only facilitate the replacement of water samples, but cannot facilitate the cleaning of the equipment after each test. In addition, when performing pH testing, the correct operation method is to place the detection end of the detection equipment in the water sample for a period of time before taking it out, so that the water sample can fully contact the detection end to ensure accurate detection results. However, the existing equipment cannot control the detection end to be placed in the water sample for a period of time before taking it out, which makes the actual detection results prone to errors. Utility Model Content

[0004] The utility model provides a device for detecting the pH value of water used for planting crops in order to solve the above-mentioned technical problems that it is inconvenient to clean the detection equipment and the detection results are prone to errors.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme: a device for detecting the pH value of water used for planting crops, comprising a detection base and a pH tester body, the pH tester body being movably arranged above the detection base, a flushing slot, a detection slot and a pressure rod installation slot being provided on the upper end surface of the detection base, a pressure rod assembly being provided on the detection base, a tester fixing pipe being connected to one side of the pressure rod assembly, a water storage chamber being provided inside the detection base, the pH tester body being clamped in the tester fixing pipe, and a flushing assembly being provided inside the detection base;

[0006] The pressure rod assembly includes a bottom tube and a movable pressure rod, the bottom tube is movably arranged in the pressure rod installation slot, and the bottom end of the movable pressure rod is inserted in the bottom tube;

[0007] The flushing component comprises a water storage outer cylinder and a water outlet pipe. The water storage outer cylinder is fixedly installed in the water storage cavity, the water outlet pipe is movably arranged in the flushing slot, and the bottom end of the water outlet pipe is vertically inserted in the water storage outer cylinder.

[0008] As a further solution of the utility model: a flushing slot is provided, and the bottom end of the flushing slot is connected to a drainage pipe, a plurality of detection slots are provided, and the flushing slots and the detection slots are evenly distributed in a ring shape on the upper end of the detection base, and the pressure rod installation slot is located at the center of the upper end of the detection base.

[0009] As a further solution of the utility model: a stepped groove is provided at the upper edge of the pressure rod installation slot, a bearing is clamped in the stepped groove, and the bearing sleeve is arranged on the tube body of the bottom tube.

[0010] As a further solution of the utility model: the pressure rod assembly also includes a limiting sleeve, which is connected to the upper end of the bottom tube, and the limiting sleeve is sleeved on the rod body of the movable pressure rod, and a limiting groove is provided on the tube body of the limiting sleeve. A connecting rod is connected to the rod body of the movable pressure rod, and the rod body of the connecting rod passes through the limiting groove, and the other end of the connecting rod is connected to the fixed tube of the tester.

[0011] As a further solution of the utility model: a cavity is opened inside the movable pressure rod, a liquid inlet one-way valve connected to the cavity is installed at the bottom end of the movable pressure rod, a liquid discharge hole connected to the cavity is also opened at the bottom end of the movable pressure rod, a compression spring A is arranged in the bottom tube, the compression spring A is located below the movable pressure rod, and the bottom tube is also filled with hydraulic oil.

[0012] As a further solution of the utility model: a blocking connecting rod is also vertically connected in the bottom tube, and the blocking connecting rod is located directly below the drainage hole. The blocking connecting rod includes a small diameter rod segment and a large diameter rod segment arranged in sequence from top to bottom, and a blocking block is connected to the upper end of the small diameter rod segment, and the blocking block is stuck in the drainage hole.

[0013] As a further solution of the utility model: the tube body of the tester fixing tube is provided with a placement groove, the bottom end of the tester fixing tube is provided with a bottom hole, and the upper end of the tester fixing tube is threadedly connected with a threaded cap.

[0014] As a further solution of the utility model: a rubber pad is connected to the inner side surface of the top end of the threaded cap.

[0015] As a further solution of the utility model: the water storage outer cylinder is fixedly connected to the water storage cavity, and a compression spring B and a piston are arranged in the water storage outer cylinder. The piston is fixedly sleeved on the bottom tube body of the water outlet pipe, and the compression spring B is against the bottom of the piston. A water outlet one-way valve is arranged in the water outlet pipe, and a nozzle is connected to the upper end of the water outlet pipe, and a water injection pipe is connected to one side of the water storage cavity.

[0016] As a further solution of the utility model: the bottom end of the water storage outer cylinder is also connected to a water storage pipe, and a water storage one-way valve is installed on the water storage pipe, and a mesh cover is fixedly provided on the upper end of the water outlet pipe.

[0017] The beneficial effects of the utility model are:

[0018] 1. By setting up a flushing slot and several test slots, water samples from different areas can be placed in each test slot during operation, which can facilitate the pH test of multiple water samples. In addition, since a flushing slot is provided, the pH tester body can be flushed after each test, and the waste water generated after each flushing can be discharged through the drain pipe to avoid affecting the accuracy of the subsequent test;

[0019] 2. By providing a pressure rod installation slot, and the pressure rod assembly is movably connected in the pressure rod installation slot, when the pressure rod assembly drives the acid-base tester body to rotate, the lower end of the acid-base tester body can be aligned with the top of each slot, which is convenient for operation and use, and the movable pressure rod of the pressure rod assembly can be slowly raised upward first, which is equivalent to prolonging the placement time of the acid-base tester body in the water sample to be tested, so as to achieve accurate measurement. After a period of time, the movable pressure rod is quickly raised upward, which is equivalent to being able to quickly take the acid-base tester body out of the water sample to be tested, without manually operating the pressure rod to restore it to its original position;

[0020] 3. By providing a flushing component, when the bottom detection part of the acid-base tester body presses the water outlet pipe downward, it can drive the piston to move downward, so that the water stored in the water storage outer cylinder can enter the water outlet pipe and be sprayed out from the nozzle, so as to realize the flushing of the bottom detection part of the acid-base tester body, so that it can be accurately tested and used next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the section structure of the detection base of the utility model;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the pressure rod assembly of the utility model;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the pressure rod assembly of the utility model;

[0026] Figure 6 This is a schematic diagram of the connection structure between the plugging connecting rod and the movable pressure rod of the utility model;

[0027] Figure 7 This is a schematic diagram of the fixed pipe structure of the tester of the utility model;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the threaded cap of the utility model;

[0029] Fig. 9 This is a schematic diagram of the cross-sectional structure of the flushing component of the utility model;

[0030] Fig.10 For this utility model Fig. 9 Schematic diagram of the structure at point A in the middle.

[0031] In the figure: 1. detection base; 11. water storage chamber; 12. flushing slot; 13. detection slot; 14. pressure rod installation slot; 15. step slot; 16. water injection pipe; 17. drainage pipe; 2. pressure rod assembly; 21. bottom pipe; 22. limit sleeve; 23. movable pressure rod; 24. limit slot; 25. connecting rod; 26. bearing; 27. cavity; 28. compression spring A; 29. ​​blocking connecting rod; 291. blocking block; 292. small diameter rod Section; 293, large diameter rod section; 210, liquid inlet check valve; 211, drain hole; 3, pH tester body; 4, tester fixing tube; 41, threaded cap; 42, bottom hole; 43, rubber pad; 44, placement groove; 5, flushing assembly; 51, water storage outer cylinder; 52, water outlet pipe; 53, compression spring B; 54, piston; 55, water storage pipe; 56, water storage check valve; 57, water outlet check valve; 58, mesh cover; 59, nozzle. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Embodiment 1

[0034] like Figures 1 to 10 As shown, a device for detecting the pH value of water for planting crops comprises a detection base 1 and a pH tester body 3, wherein the pH tester body 3 is movably arranged above the detection base 1, and a flushing slot 12, a detection slot 13 and a pressure rod installation slot 14 are provided on the upper end surface of the detection base 1, a pressure rod assembly 2 is provided on the detection base 1, and a tester fixing pipe 4 is connected to one side of the pressure rod assembly 2, a water storage chamber 11 is further provided inside the detection base 1, the pH tester body 3 is clamped in the tester fixing pipe 4, and a flushing assembly 5 is further provided inside the detection base 1, and the model of the pH tester body 3 includes but is not limited to Shanghai Sanxin SX620 pen-type pH meter;

[0035] The pressure rod assembly 2 includes a bottom tube 21 and a movable pressure rod 23. The bottom tube 21 is movably arranged in the pressure rod installation slot 14, and the bottom end of the movable pressure rod 23 is inserted in the bottom tube 21.

[0036] The flushing assembly 5 includes a water storage outer cylinder 51 and a water outlet pipe 52 . The water storage outer cylinder 51 is fixedly installed in the water storage chamber 11 , and the water outlet pipe 52 is movably arranged in the flushing slot 12 , and the bottom end of the water outlet pipe 52 is vertically inserted in the water storage outer cylinder 51 .

[0037] Embodiment 2

[0038] like Figures 1 to 10 As shown, in addition to all the technical features of the first embodiment, this embodiment also includes:

[0039] There is one flushing slot 12, and the bottom end of the flushing slot 12 is connected to a drain pipe 17. There are several detection slots 13, and the flushing slots 12 and the detection slots 13 are evenly distributed in a ring shape on the upper end of the detection base 1. The pressure rod installation slot 14 is located at the center of the upper end of the detection base 1. During operation, water samples from different areas can be placed in each detection slot 13, which can facilitate the pH detection of multiple water samples. In addition, since the flushing slot 12 is provided, the pH tester body 3 can be flushed after each test, and the waste water generated after each flushing can be discharged through the drain pipe 17 to avoid affecting the accuracy of subsequent tests. In addition, since the pressure rod installation slot 14 is located in the center, when the pressure rod assembly 2 drives the pH tester body 3 to rotate, the lower end of the pH tester body 3 can be aligned with the top of each slot, which is convenient for operation.

[0040] A stepped groove 15 is provided at the upper edge of the pressure rod installation slot 14, and a bearing 26 is clamped in the stepped groove 15. The bearing 26 is sleeved on the tube body of the bottom tube 21, so that the bottom tube 21 can rotate in the pressure rod installation slot 14, and the pressure rod assembly 2 can drive the acid-base tester body 3 to rotate.

[0041] Embodiment 3

[0042] like Figures 1 to 10 As shown, in addition to all the technical features of the first embodiment, this embodiment also includes:

[0043] The pressure rod assembly 2 also includes a limiting sleeve 22, which is connected to the upper end of the bottom tube 21 and is sleeved on the rod body of the movable pressure rod 23. A limiting groove 24 is provided on the rod body of the limiting sleeve 22. A connecting rod 25 is connected to the rod body of the movable pressure rod 23, and the rod body of the connecting rod 25 passes through the limiting groove 24. The other end of the connecting rod 25 is connected to the tester fixed tube 4, so that the tester fixed tube 4 and the movable pressure rod 23 can be combined together. Since the connecting rod 25 is stuck in the limiting groove 24, it can ensure that the tester fixed tube 4 can be driven up and down by pressing the movable pressure rod 23.

[0044] A cavity 27 is provided inside the movable pressure rod 23, and a liquid inlet check valve 210 connected to the cavity 27 is installed at the bottom end of the movable pressure rod 23. A drainage hole 211 connected to the cavity 27 is also provided at the bottom end of the movable pressure rod 23. A compression spring A28 is arranged in the bottom tube 21. The compression spring A28 is located below the movable pressure rod 23, and the bottom tube 21 is also filled with hydraulic oil. When the movable pressure rod 23 is pressed downward, the hydraulic oil can enter the cavity 27 through the liquid inlet check valve 210, and the compression spring A28 is compressed downward at the same time. After the downward pressure applied to the movable pressure rod 23 is released, the compression spring A28 has an upward pushing force on the movable pressure rod 23. At this time, the hydraulic oil entering the cavity 27 can flow out through the drainage hole 211, so that the movable pressure rod 23 can steadily rise to the initial position.

[0045] A plugging connecting rod 29 is also vertically connected in the bottom tube 21. The plugging connecting rod 29 is located directly below the drainage hole 211. The plugging connecting rod 29 includes a small diameter rod section 292 and a large diameter rod section 293 arranged in sequence from top to bottom. The upper end of the small diameter rod section 292 is connected with a plugging block 291, and the plugging block 291 is stuck in the drainage hole 211. When the movable pressure rod 23 is pressed down to the bottom end of the bottom tube 21, the downward pressure applied to the movable pressure rod 23 is released. Since the large diameter rod section 293 of the plugging connecting rod 29 is located at the drainage hole 211, the gap between the large diameter rod section 293 and the drainage hole 211 is small, so only a small amount of hydraulic oil can flow out, that is, the movable pressure rod 23 can only slowly move upward. Lifting is equivalent to extending the placement time of the acid-base tester body 3 in the water sample to be tested, thereby achieving accurate measurement. After a period of time, the small-diameter rod section 292 of the blocking connecting rod 29 is located at the drainage hole 211. The gap between the small-diameter rod section 292 and the drainage hole 211 is relatively large, and more hydraulic oil can flow out, which can enable the movable pressure rod 23 to rise quickly, that is, it is equivalent to being able to quickly remove the acid-base tester body 3 from the water sample to be tested, and when the movable pressure rod 23 rises to the initial position, the blocking block 291 is stuck in the drainage hole 211 to form a blockage for the drainage hole 211 to prevent hydraulic oil from entering the cavity 27 when the device is tilted or placed horizontally.

[0046] Embodiment 4

[0047] like Figures 1 to 10 As shown, in addition to all the technical features of the first embodiment, this embodiment also includes:

[0048] The tube body of the tester fixing tube 4 is provided with a placement groove 44, and the bottom end of the tester fixing tube 4 is provided with a bottom hole 42. The upper end of the tester fixing tube 4 is threadedly connected with a threaded cap 41. The acidity and alkalinity tester body 3 can be placed in the tester fixing tube 4 through the placement groove 44, and the detection part at the bottom end of the acidity and alkalinity tester body 3 can be extended from the bottom hole 42. The acidity and alkalinity tester body 3 is limited by tightening the threaded cap 41 to ensure that the acidity and alkalinity tester body 3 can be firmly stuck in the tester fixing tube 4.

[0049] A rubber pad 43 is connected to the inner side of the top of the threaded cap 41. When the threaded cap 41 is tightened, the upper end of the acid-base tester body 3 can be pressed against the rubber pad 43, thereby ensuring the stability of the installation position of the acid-base tester body 3 and preventing the upper end of the acid-base tester body 3 from being squeezed and damaged.

[0050] The water storage outer cylinder 51 is fixedly connected to the water storage chamber 11, and a compression spring B53 and a piston 54 are arranged in the water storage outer cylinder 51. The piston 54 is fixedly sleeved on the bottom tube body of the water outlet pipe 52, and the compression spring B53 is against the bottom of the piston 54. A water outlet one-way valve 57 is arranged in the water outlet pipe 52, and a nozzle 59 is connected to the upper end of the water outlet pipe 52. One side of the water storage chamber 11 is connected to a water injection pipe 16. When the bottom detection part of the acid-base tester body 3 presses the water outlet pipe 52 downward, the piston 54 can be driven to move downward, so that the water stored in the water storage outer cylinder 51 can enter the water outlet pipe 52 and be sprayed out from the nozzle 59, so as to realize the flushing of the bottom detection part of the acid-base tester body 3, so that it can be accurately detected and used next time, and the water for cleaning can be added to the water storage chamber 11 through the water injection pipe 16.

[0051] The bottom end of the water storage outer cylinder 51 is also connected to a water storage pipe 55, and a water storage one-way valve 56 is installed on the water storage pipe 55. The upper end of the water outlet pipe 52 is fixedly sleeved with a mesh cover 58. When the water outlet pipe 52 is pressed downward through the bottom detection part of the acid-base tester body 3, the bottom detection part of the acid-base tester body 3 rests on the mesh cover 58 to avoid direct contact with the nozzle 59, so as to ensure that the nozzle 59 can spray water normally. During water spraying and cleaning, the water storage pipe 55 is in a closed state under the action of the water storage one-way valve 56. Therefore, the water stored in the water storage outer cylinder 51 can only be sprayed out through the water outlet pipe 52. When the cleaning is completed, the acid-base tester body 3 returns to its initial position. At this time, the compressed compression spring B53 pushes the piston 54 upward. At this time, the water outlet one-way valve 57 in the water outlet pipe 52 is in a closed state. Therefore, the water can be replenished into the water storage outer cylinder 51 through the water storage pipe 55 for the next cleaning use.

[0052] Working principle: First, place the test tube containing the water sample in the detection slot 13, and pour cleaning water into the water storage chamber 11. During the test, place the acid-base tester body 3 in the tester fixed tube 4 through the placement slot 44, and make the detection part at the bottom of the acid-base tester body 3 extend from the bottom hole 42, and limit the acid-base tester body 3 by tightening the threaded cap 41 to ensure that the acid-base tester body 3 can be firmly stuck in the tester fixed tube 4, and rotate the pressure rod assembly 2. Align the pH tester body 3 with any water sample test tube below, and when the movable pressure rod 23 is pressed downward, the hydraulic oil can enter the cavity 27 through the liquid inlet check valve 210, and the compression spring A28 is compressed downward. At this time, the detection part of the pH tester body 3 can be inserted into the water sample. At this time, after releasing the downward pressure applied to the movable pressure rod 23, since the large diameter rod section 293 of the blocking connecting rod 29 is located at the drainage hole 211, the large diameter rod section 293 and the drainage hole 2 11 is small, so only a small amount of hydraulic oil can flow out, that is, the movable pressure rod 23 can only rise slowly, which is equivalent to extending the placement time of the acid-base tester body 3 in the water sample to be tested, thereby achieving accurate measurement. After a period of time, the small diameter rod section 292 of the blocking connecting rod 29 is located at the drainage hole 211, and the gap between the small diameter rod section 292 and the drainage hole 211 is large, so more hydraulic oil can flow out, which can make the movable pressure rod 23 rise quickly. , which is equivalent to being able to quickly take the acid-base tester body 3 out of the water sample to be tested, and then rotating the acid-base tester body 3 to the flushing slot 12. When the bottom detection part of the acid-base tester body 3 presses the water outlet pipe 52 downward, it can drive the piston 54 to move downward, and then the water stored in the water storage outer cylinder 51 can enter the water outlet pipe 52 and be sprayed out from the nozzle 59, so as to realize the flushing of the bottom detection part of the acid-base tester body 3, and then another water sample can be tested.

[0053] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for detecting the pH value of water used for planting crops, comprising a detection base (1) and a pH tester body (3), characterized in that: The acid-base tester body (3) is movably arranged above the test base (1); the upper end surface of the test base (1) is provided with a flushing slot (12), a test slot (13) and a pressure rod installation slot (14); a pressure rod assembly (2) is arranged on the test base (1); one side of the pressure rod assembly (2) is connected to a tester fixing tube (4); a water storage chamber (11) is also arranged inside the test base (1); the acid-base tester body (3) is clamped in the tester fixing tube (4); and a flushing assembly (5) is also arranged inside the test base (1); The pressure rod assembly (2) comprises a bottom tube (21) and a movable pressure rod (23), wherein the bottom tube (21) is movably arranged in a pressure rod installation slot (14), and the bottom end of the movable pressure rod (23) is inserted in the bottom tube (21); The flushing assembly (5) comprises a water storage outer cylinder (51) and a water outlet pipe (52); the water storage outer cylinder (51) is fixedly installed in the water storage chamber (11); the water outlet pipe (52) is movably arranged in the flushing slot (12); and the bottom end of the water outlet pipe (52) is vertically inserted in the water storage outer cylinder (51).

2. The device for detecting pH value of water used for crop planting according to claim 1, characterized in that: The flushing slot (12) is provided with one, and the bottom end of the flushing slot (12) is connected to a drainage pipe (17), a plurality of detection slots (13) are provided, and the flushing slots (12) and the detection slots (13) are evenly distributed in a ring shape on the upper end of the detection base (1), and the pressure rod installation slot (14) is located at the center of the upper end of the detection base (1).

3. The device for detecting pH value of water used for crop planting according to claim 2, characterized in that: A stepped groove (15) is provided at the upper edge of the compression rod installation slot (14), a bearing (26) is clamped in the stepped groove (15), and the bearing (26) is sleeved on the tube body of the bottom tube (21).

4. The device for detecting pH value of water used for crop planting according to claim 1, characterized in that: The pressure rod assembly (2) further comprises a limiting sleeve (22), wherein the limiting sleeve (22) is connected to the upper end of the bottom tube (21), and the limiting sleeve (22) is sleeved on the rod body of the movable pressure rod (23), a limiting groove (24) is provided on the tube body of the limiting sleeve (22), a connecting rod (25) is connected to the rod body of the movable pressure rod (23), and the rod body of the connecting rod (25) passes through the limiting groove (24), and the other end of the connecting rod (25) is connected to the tester fixing tube (4).

5. The device for detecting pH value of water used for crop planting according to claim 4, characterized in that: The movable pressure rod (23) has a cavity (27) formed inside, the bottom end of the movable pressure rod (23) is provided with a liquid inlet check valve (210) connected to the cavity (27), the bottom end of the movable pressure rod (23) is also provided with a liquid discharge hole (211) connected to the cavity (27), a compression spring A (28) is arranged inside the bottom tube (21), the compression spring A (28) is located below the movable pressure rod (23), and the bottom tube (21) is also filled with hydraulic oil.

6. The device for detecting pH value of water used for crop planting according to claim 5, characterized in that: A blocking connecting rod (29) is also vertically connected inside the bottom tube (21), and the blocking connecting rod (29) is located directly below the drainage hole (211). The blocking connecting rod (29) comprises a small-diameter rod segment (292) and a large-diameter rod segment (293) which are arranged in sequence from top to bottom. The upper end of the small-diameter rod segment (292) is connected to a blocking block (291), and the blocking block (291) is stuck in the drainage hole (211).

7. The device for detecting pH value of water used for crop planting according to claim 1, characterized in that: The body of the tester fixing tube (4) is provided with a placement groove (44), the bottom end of the tester fixing tube (4) is provided with a bottom hole (42), and the upper end of the tester fixing tube (4) is threadedly connected with a threaded cap (41).

8. The device for detecting pH value of water used for crop planting according to claim 7, characterized in that: A rubber pad (43) is connected to the inner side surface of the top end of the threaded cap (41).

9. The device for detecting pH value of water used for crop planting according to claim 1, characterized in that: The water storage outer cylinder (51) is fixedly connected to the water storage chamber (11), and a compression spring B (53) and a piston (54) are arranged in the water storage outer cylinder (51). The piston (54) is fixedly sleeved on the bottom end of the water outlet pipe (52), and the compression spring B (53) is pressed against the bottom of the piston (54). A water outlet check valve (57) is arranged in the water outlet pipe (52), and a nozzle (59) is connected to the upper end of the water outlet pipe (52). One side of the water storage chamber (11) is connected to a water injection pipe (16).

10. The device for detecting pH value of water used for crop planting according to claim 9, characterized in that: The bottom end of the water storage outer cylinder (51) is also connected to a water storage pipe (55), and a water storage check valve (56) is installed on the water storage pipe (55). The upper end of the water outlet pipe (52) is fixedly sleeved with a mesh cover (58).

Images