A method and apparatus for measuring the hardness of tilled soil

Abstract

The present application relates to the field of measuring equipment, especially to a kind of cultivated soil hardness measuring method and measuring equipment.The present application provides a kind of cultivated soil hardness measuring method and measuring equipment, which can improve the accuracy and reliability of soil hardness detection data, and multiple direction data can be obtained by one detection.A kind of cultivated soil hardness measuring method and measuring equipment, including round pipe, shell, driving mechanism and measuring mechanism etc.;The top of the round pipe is fixedly connected with the shell, the driving mechanism is arranged on the shell, and the measuring mechanism is arranged on the driving mechanism.For different hardness of soil, the depth of probe insertion into soil will be different, after the probe stops driving the coil to move downward, the staff respectively reads and records the scale aimed at four pointers, multiple probes can measure in multiple directions, multiple data can be conveniently analyzed subsequently, and the reliability of data can be improved by analyzing multiple data.

Description

Technical Field

[0001] This invention relates to a testing device, and more particularly to a method and device for measuring the hardness of arable land soil. Background Technology

[0002] Soil hardness, also known as soil compaction, soil firmness, or soil penetration resistance, is generally expressed as the resistance when a metal plunger or probe is pressed into the soil. Soil compaction refers to the soil's ability to resist compaction and breakage by external forces, and is one aspect of soil properties. The soil hardness of arable land reflects the ease with which vegetation can grow, which is very important for agricultural production.

[0003] In existing soil hardness testing methods, the tip of the soil hardness testing instrument is usually inserted into the soil at a constant speed and then pulled out vertically. The value displayed on the meter is the measured soil hardness value. However, this testing method can only obtain one data point at a time, and the data is greatly affected by randomness, which makes the data less accurate and reliable. Furthermore, this testing method can only detect data from one direction at a time, resulting in insufficient data diversity, which further makes the data less accurate and reliable. Summary of the Invention

[0004] In view of this, the present invention provides a method and apparatus for measuring the soil hardness of cultivated land that can improve the accuracy and reliability of soil hardness detection data and obtain data from multiple directions in a single test.

[0005] The technical solution is as follows: a method and device for measuring the hardness of arable land soil, comprising a circular tube, a housing, a driving mechanism, a measuring mechanism, and an indicating mechanism. The housing is fixedly connected to the top of the circular tube, the driving mechanism is disposed on the housing, the measuring mechanism is disposed on the driving mechanism, and the indicating mechanism is disposed on the circular tube.

[0006] As a further preferred embodiment, the drive mechanism includes an electric push rod, a push rod, a drive piston, and a drive base. The electric push rod is fixedly connected inside the housing. The push rod is fixedly connected to the telescopic rod of the electric push rod. The lower end of the push rod is fixedly connected to the drive piston, and the drive piston is slidably connected to the inner wall of the circular tube. The bottom of the inner wall of the circular tube is fixedly connected to the drive base, and the drive base communicates with the circular tube.

[0007] As a further preferred embodiment, the measuring mechanism includes a first telescopic cylinder, a second telescopic cylinder, a probe, a first return spring, and a second return spring. Four first telescopic cylinders are fixedly connected to the lower part of the drive base, and each first telescopic cylinder is fixedly connected to a circular tube and communicates with the circular tube. A second telescopic cylinder is slidably connected to the inner wall of each first telescopic cylinder, and the second telescopic cylinder communicates with the first telescopic cylinder. A probe is slidably connected to the inner wall of each second telescopic cylinder. A first return spring is fixedly connected between each first telescopic cylinder and the second telescopic cylinder, and a second return spring is fixedly connected between each second telescopic cylinder and the probe.

[0008] As a further preferred embodiment, the indicating mechanism includes a measuring support frame, a first horizontal circular shaft, a torsion spring, a rotating ring, a pointer, a coil, and a sealing column. Four measuring support frames are fixedly connected to the upper part of the outer wall of the circular tube. A first horizontal circular shaft is fixedly connected to each measuring support frame. A rotating ring is rotatably connected to each first horizontal circular shaft. Each rotating ring has a scale line. A torsion spring is fixedly connected between the rotating ring and the first horizontal circular shaft. A pointer is fixedly connected to one end of each first horizontal circular shaft. A coil is wound around each rotating ring and passes through the circular tube. The lower end of the coil is fixedly connected to a probe. Four sealing columns are fixedly connected inside the driving piston, and the coil passes through the sealing columns.

[0009] As a further preferred embodiment, a blocking mechanism is also included, which is disposed on the circular tube. The blocking mechanism includes a blocking ring, a connecting rod, a sliding paddle, and a directional plate. The blocking ring is rotatably connected to the lower part of the circular tube. The blocking ring has four measuring holes. The connecting rod is fixedly connected to the inner wall of the blocking ring. The sliding paddle is fixedly connected to the top of the connecting rod. The directional plate is fixedly connected to the middle part of the circular tube. The directional plate has a sliding groove, and the connecting rod is slidably connected to the sliding groove of the directional plate.

[0010] As a further preferred embodiment, a support mechanism is also included, which is mounted on the circular tube. The support mechanism includes a triangular bracket, a connector, a second horizontal circular shaft, a movable rod, a large spring, a fixed foot, and a fixed block. The triangular bracket is fixedly connected to the upper part of the circular tube, and three second horizontal circular shafts are fixedly connected to the triangular bracket. A connector is rotatably connected to each second horizontal circular shaft. Two movable rods are slidably connected to the lower part of each connector. A large spring is fixedly connected between each movable rod and the connector. A fixed foot is fixedly connected between the bottom of every two movable rods, and a fixed block is fixedly connected between the middle of every two movable rods.

[0011] As a further preferred embodiment, it also includes a spiral head, which is rotatably connected to the bottom of the circular tube.

[0012] As a further preferred embodiment, the housing also includes anti-slip handles, with two anti-slip handles fixedly connected to the housing and the two anti-slip handles arranged symmetrically.

[0013] Preferably, it includes the following steps:

[0014] Step 1: The staff places the device on the farmland where soil hardness testing is required, and then holds the round tube and presses it down to insert it into the soil to the appropriate depth.

[0015] Step 2: Then the staff starts the electric push rod. The extension rod of the electric push rod pushes the drive piston to move downward. The four second extension cylinders and probes will move away from each other and insert into the soil. The movement of the probes will pull the coil to move. After the extension rod of the electric push rod is fully extended, the pointer will point to a certain mark on the rotating ring.

[0016] Step 3: Then, the staff read and recorded the scales aligned with the four pointers. Then, the telescopic rod of the electric push rod will retract, the second telescopic cylinder and the probe will no longer pull the coil, and the rotating ring will rotate in the opposite direction to rewind and drive the coil to move upward and reset.

[0017] Step 4: After the telescopic rod of the electric actuator has retracted, the worker turns off the electric actuator, and then holds the round tube and pulls it out of the soil.

[0018] The present invention has the following advantages:

[0019] 1. After the circular tube is inserted into the soil, the operator activates the electric push rod. The extension rod of the electric push rod extends and drives the push rod, drive piston, and four sealed columns downward. The downward movement of the drive piston compresses the air in the lower part of the circular tube, causing the four second telescopic cylinders and probes to move away from each other. The movement of the probes pulls the coils, which in turn causes the rotating ring to rotate and unwind. For soils of different hardness, the resistance that the probes need to overcome when inserting into the soil is different, and the depth of insertion will vary. After the probes stop moving the coils downward, the operator reads and records the readings of the four pointers. Multiple probes can perform measurements in multiple directions, and multiple data points facilitate subsequent data analysis. Furthermore, analyzing multiple data points improves the reliability of the data.

[0020] 2. Initially, the connecting rod is located at the rightmost end of the sliding groove on the directional plate. When the staff inserts the round tube into the soil, the blocking ring can prevent the soil from contacting the probe, thereby reducing the probability of the soil blocking the second telescopic cylinder and the probe, thus reducing experimental error and further improving the reliability of the data. After the staff inserts the round tube into the soil to a suitable depth, the staff moves the sliding lever to the left, so that the second telescopic cylinder and the probe can pass through the measuring hole on the blocking ring.

[0021] 3. When the staff inserts the round tube downwards into the soil, the spiral head will first come into contact with the soil. The staff presses the round tube downwards, and the round tube will drive the spiral head to move downwards together. Due to the pressure of the soil on the spiral head, the spiral head will rotate as it moves downwards. The rotation of the spiral head will squeeze the soil outwards, making it easier for the round tube to be inserted into the soil, which is more convenient for measuring the hardness of the farmland soil. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a partial cross-sectional perspective view of the three-dimensional structure of the present invention.

[0024] Figure 3 For the present invention Figure 2 A magnified three-dimensional structural diagram of A in the middle.

[0025] Figure 4 This is a partial cross-sectional three-dimensional structural schematic diagram of the support mechanism of the present invention.

[0026] Figure 5 This is a partial cross-sectional three-dimensional structural schematic diagram of the driving mechanism of the present invention.

[0027] Figure 6 This is a partial cross-sectional perspective view of the indicating mechanism and the shielding mechanism of the present invention.

[0028] Figure 7 This is a partial cross-sectional three-dimensional structural schematic diagram of the shielding mechanism of the present invention.

[0029] Figure 8 This is a partial cross-sectional three-dimensional structural diagram of the circular tube, connecting rod, and directional plate of the present invention.

[0030] Figure 9 This is a schematic diagram of a second partial cross-sectional three-dimensional structure of the present invention.

[0031] Figure 10 This is a partial cross-sectional three-dimensional structural diagram of the measuring mechanism and the shielding mechanism of the present invention.

[0032] Figure 11This is a partial cross-sectional three-dimensional structural schematic diagram of the measuring mechanism of the present invention in its working state.

[0033] Figure 12 This is a partial cross-sectional three-dimensional structural diagram of the indicating mechanism of the present invention.

[0034] Figure 13 This is a partial cross-sectional three-dimensional structural diagram of the indicating mechanism and measuring mechanism of the present invention.

[0035] Figure 14 This is a partial cross-sectional three-dimensional structural diagram of the indicating mechanism of the present invention.

[0036] Figure 15 This is a schematic diagram of the workflow of the present invention.

[0037] Wherein: 1-round tube, 2-housing, 31-electric push rod, 32-push rod, 33-drive piston, 34-drive base, 41-first telescopic cylinder, 42-second telescopic cylinder, 43-probe, 44-first return spring, 45-second return spring, 51-measuring support frame, 52-first horizontal round shaft, 53-torsion spring, 54-rotating ring, 55-pointer, 56-coil, 57-sealing column, 61-blocking ring, 62-measuring hole, 63-connecting rod, 64-sliding paddle, 65-directional plate, 71-triangular bracket, 72-connector, 73-second horizontal round shaft, 74-moving rod, 75-large spring, 76-fixed foot, 77-fixed block, 8-screw head, 9-anti-slip handle. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0039] Example 1

[0040] A method and apparatus for measuring soil hardness in arable land, such as Figures 1-14 As shown, it includes a circular tube 1, a housing 2, a drive mechanism, a measuring mechanism, and an indicating mechanism. The housing 2 is bolted to the top of the circular tube 1. The drive mechanism is mounted on the housing 2. The measuring mechanism is mounted on the drive mechanism. The measuring mechanism is used to measure soil hardness. The indicating mechanism is mounted on the circular tube 1.

[0041] The driving mechanism includes an electric push rod 31, a push rod 32, a driving piston 33, and a driving base 34. The electric push rod 31 is bolted inside the housing 2. The push rod 32 is bolted to the telescopic rod of the electric push rod 31. The lower end of the push rod 32 is riveted to the driving piston 33, and the driving piston 33 is slidably connected to the inner wall of the circular tube 1. The bottom of the inner wall of the circular tube 1 is riveted to the driving base 34, and the driving base 34 is connected to the circular tube 1.

[0042] The measuring mechanism includes a first telescopic cylinder 41, a second telescopic cylinder 42, a probe 43, a first return spring 44, and a second return spring 45. The lower part of the drive base 34 is connected to four first telescopic cylinders 41 via rivets, and each first telescopic cylinder 41 is connected to the circular tube 1 via rivets. Each first telescopic cylinder 41 communicates with the circular tube 1. A second telescopic cylinder 42 is slidably connected to the inner wall of each first telescopic cylinder 41, and the second telescopic cylinder 42 communicates with the first telescopic cylinder 41. A probe 43 is slidably connected to the inner wall of each second telescopic cylinder 42. A first return spring 44 is connected to each first telescopic cylinder 41 and the second telescopic cylinder 42 via a hook, and a second return spring 45 is connected to each second telescopic cylinder 42 and the probe 43 via a hook.

[0043] The indicating mechanism includes a measuring support frame 51, a first horizontal circular shaft 52, a torsion spring 53, a rotating ring 54, a pointer 55, a coil 56, and a sealing column 57. Four measuring support frames 51 are bolted to the upper part of the outer wall of the circular tube 1. Each measuring support frame 51 is riveted to a first horizontal circular shaft 52. A rotating ring 54 is rotatably connected to each first horizontal circular shaft 52. Each rotating ring 54 has graduation lines. The rotating ring 54 is connected to the first horizontal circular shaft 54... A torsion spring 53 is connected between the horizontal circular shafts 52 by hooks. A pointer 55 is bolted to one end of each of the first horizontal circular shafts 52. A coil 56 is wound around each of the rotating rings 54, and the coil 56 passes through the circular tube 1. The lower end of the coil 56 is fixedly connected to the probe 43. Four sealing columns 57 are fixedly connected inside the driving piston 33, and the coil 56 passes through the sealing columns 57. The sealing columns 57 prevent air in the lower part of the circular tube 1 from leaking through the driving piston 33.

[0044] In practical use, the operator places the device on the farmland where soil hardness testing is required, ensuring the bottom of the cylindrical tube 1 is in contact with the soil. The operator then presses the cylindrical tube 1 downwards, causing the device to move downwards and partially insert the tube 1 into the soil. Once the tube 1 has reached a suitable depth, the operator stops pressing it down and activates the electric push rod 31. The extension rod of the electric push rod 31 extends, driving the push rod 32, the drive piston 33, and the four sealing columns 57 downwards. The downward movement of the drive piston 33 compresses the air inside the lower part of the cylindrical tube 1. The sealing columns 57 prevent the air inside the lower part of the cylindrical tube 1 from leaking out through the drive piston 33. The compressed air in the lower part pushes the four second telescopic cylinders 42 and probes 43 to move away from each other, compressing the first and second return springs 44 and 45. The movement of probes 43 pulls coil 56, which in turn rotates and unwinds the rotating ring 54, torturing the torsion spring 53. The four probes 43, moving away from each other, come into contact with the soil. As they continue to move away from each other, they insert themselves into the soil. For soils of different hardness, the resistance that probes 43 need to overcome when inserting into the soil varies, resulting in different insertion depths. After the drive piston 33 moves downward and contacts the drive base 34, the telescopic rod of the electric push rod 31 extends, driving... The piston 33 stops moving downwards and no longer compresses the air in the lower part of the circular tube 1, causing the second telescopic cylinder 42 and probe 43 to stop moving. The stopping of probe 43 stops the downward movement of coil 56, and the stopping of coil 56 causes the rotating ring 54 to stop rotating and unwinding. At this time, pointer 55 will point to a certain mark on the rotating ring 54. The operator reads and records the marks aligned with the four pointers 55. Multiple probes 43 can perform measurements in different directions, and multiple data points facilitate subsequent data analysis, improving data reliability. Subsequently, the telescopic rod of the electric push rod 31 retracts, which in turn drives the push rod 32 and the driving piston 3. 3 and the sealing column 57 move upward to reset, the driving piston 33 no longer squeezes the air in the lower part of the circular tube 1, the first reset spring 44 and the second reset spring 45 will reset, the reset of the first reset spring 44 and the second reset spring 45 will drive the four second telescopic cylinders 42 and probes 43 to move closer to each other to reset, the second telescopic cylinders 42 and probes 43 will no longer pull the coil 56, the torsion spring 53 will reset, the reset of the torsion spring 53 will drive the rotating ring 54 to rotate in the opposite direction to reset, the reverse rotation of the rotating ring 54 will rewind and drive the coil 56 to move upward to reset, after the telescopic rod of the electric push rod 31 has completed its retraction, the worker closes the electric push rod 31, and then the worker holds the circular tube 1 and pulls the circular tube 1 out of the soil.

[0045] Example 2

[0046] Based on Example 1, such as Figures 6-10 As shown, it also includes a blocking mechanism, which is installed on the circular tube 1. The blocking mechanism includes a blocking ring 61, a connecting rod 63, a sliding paddle 64, and a directional plate 65. The blocking ring 61 is rotatably connected to the lower part of the circular tube 1. The blocking ring 61 has four measuring holes 62. The connecting rod 63 is bolted to the inner wall of the blocking ring 61. The sliding paddle 64 is bolted to the top of the connecting rod 63. The directional plate 65 is riveted to the middle part of the circular tube 1. The directional plate 65 has a sliding groove, and the connecting rod 63 is slidably connected to the sliding groove of the directional plate 65.

[0047] Initially, the connecting rod 63 is located at the rightmost end of the sliding groove on the orientation plate 65. When the operator inserts the round tube 1 into the soil, the blocking ring 61 prevents the soil from contacting the probe 43, thereby reducing the probability of soil clogging the second telescopic cylinder 42 and the probe 43, thus reducing experimental error and further improving the reliability of the data. After the operator inserts the round tube 1 into the soil to a suitable depth, the operator moves the sliding lever 64 to the left. The leftward movement of the sliding lever 64 will cause the connecting rod 63 to move to the left, and the connecting rod 63 will slide within the sliding groove of the orientation plate 65. The leftward movement of the sliding lever 64 will cause the blocking ring 61 to move. After rotating clockwise, the connecting rod 63 slides to the leftmost end of the sliding groove on the directional plate 65. The operator then stops moving the sliding paddle 64, and the connecting rod 63 stops moving. The blocking ring 61 will stop rotating, and at this time, the second telescopic cylinder 42 and the probe 43 can pass through the measuring hole 62 on the blocking ring 61. After the operator closes the electric push rod 31, the operator moves the sliding paddle 64 to the right to reset. The movement of the sliding paddle 64 to the right will drive the connecting rod 63 to move to the right to reset. The connecting rod 63 slides from the left side to the right side of the sliding groove on the directional plate 65 to complete the reset. The reset of the connecting rod 63 will drive the blocking ring 61 to rotate in the opposite direction to reset.

[0048] Example 3

[0049] Based on Example 2, such as Figure 1 , Figure 2 and Figure 4As shown, it also includes a support mechanism, which is mounted on the circular tube 1. The support mechanism is used to support the circular tube 1. The support mechanism includes a triangular bracket 71, a connector 72, a second horizontal circular shaft 73, a movable rod 74, a large spring 75, a fixed foot 76, and a fixed block 77. The upper part of the circular tube 1 is connected to the triangular bracket 71 by rivets. Three second horizontal circular shafts 73 are connected to the triangular bracket 71 by bolts. Each second horizontal circular shaft 73 is rotatably connected to a connector 72. Each connector 72 is slidably connected to two movable rods 74 at its lower part. A large spring 75 is fixedly connected between each movable rod 74 and the connector 72. A fixed foot 76 is bolted between the bottom of every two movable rods 74. A fixed block 77 is riveted between the middle of every two movable rods 74.

[0050] When the circular tube 1 contacts the soil, the worker swings the connector 72, movable rod 74, large spring 75, fixed foot 76, and fixed block 77 outwards, causing the three fixed feet 76 to contact the soil. When the worker inserts the circular tube 1 into the soil, the downward movement of the circular tube 1 causes the triangular bracket 71 to move downwards. The downward movement of the triangular bracket 71 causes the connector 72 and the second horizontal circular shaft 73 to move downwards. The downward movement of the connector 72 compresses the large spring 75. When the worker inserts the circular tube 1 to the appropriate depth in the soil, the worker stops pressing the circular tube 1 downwards, and the triangular bracket 71, connector 72, and second horizontal circular shaft 73 also stop moving downwards. Then the worker opens... The electric push rod 31 is activated for testing. The triangular bracket 71, connector 72, movable rod 74, and fixed foot 76 support the round tube 1 during testing, making the round tube 1 more stable during the testing process. After the test is completed, the staff pulls the round tube 1 upward. The upward movement of the round tube 1 will drive the triangular bracket 71, connector 72, second horizontal circular shaft 73, and movable rod 74 to move upward. The large spring 75 will return to its original position. After the staff pulls the round tube 1 out of the soil, the triangular bracket 71, connector 72, second horizontal circular shaft 73, movable rod 74, and large spring 75 will return to their original positions. Then, the staff swings the connector 72, movable rod 74, large spring 75, fixed foot 76, and fixed block 77 in the opposite direction to return to their original positions.

[0051] Example 4

[0052] Based on Example 3, such as Figure 1 and Figure 8 As shown, it also includes a spiral head 8, which is rotatably connected to the bottom of the round tube 1. The spiral head 8 is used to compress the soil.

[0053] When the staff inserts the round tube 1 downwards into the soil, the spiral head 8 will first come into contact with the soil. The staff presses the round tube 1 downwards, and the round tube 1 will drive the spiral head 8 to move downwards together. Due to the pressure of the soil on the spiral head 8, the spiral head 8 will rotate as it moves downwards. The rotation of the spiral head 8 will squeeze the soil outwards, making it easier for the round tube 1 to be inserted into the soil, which is convenient for better measurement of the hardness of the cultivated soil. When the staff pulls the round tube 1 out, the upward movement of the round tube 1 will drive the spiral head 8 to move upwards and reset.

[0054] Example 5

[0055] Based on Example 4, such as Figure 1 As shown, it also includes anti-slip handles 9. Two anti-slip handles 9 are connected to the housing 2 by rivets, and the two anti-slip handles 9 are arranged symmetrically.

[0056] When the worker inserts the round tube 1 downward into the soil, the worker holds the anti-slip handle 9 and then presses the anti-slip handle 9 and the round tube 1 downward to allow the round tube 1 to be inserted into the soil. The anti-slip handle 9 allows the worker to apply force more effectively, making it easier for the round tube 1 to be inserted into the soil. After the test is completed, the worker holds the anti-slip handle 9 and then pulls the anti-slip handle 9 upward. The upward movement of the anti-slip handle 9 will cause the round tube 1 to move upward and be pulled out of the soil.

[0057] Although this disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to this disclosure without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Therefore, the scope of this disclosure should not be limited to the above embodiments, but should be defined not only by the appended claims, but also by their equivalents.

Claims

1. A device for measuring the hardness of arable land soil, characterized in that, It includes a circular tube (1), a housing (2), a drive mechanism, a measuring mechanism and an indicating mechanism. The housing (2) is fixedly connected to the top of the circular tube (1). The drive mechanism is disposed on the housing (2). The measuring mechanism is disposed on the drive mechanism. The indicating mechanism is disposed on the circular tube (1). The driving mechanism includes an electric push rod (31), a push rod (32), a driving piston (33), and a driving base (34). The electric push rod (31) is fixedly connected inside the housing (2). The push rod (32) is fixedly connected to the telescopic rod of the electric push rod (31). The driving piston (33) is fixedly connected to the lower end of the push rod (32). The driving piston (33) is slidably connected to the inner wall of the round tube (1). The driving base (34) is fixedly connected to the bottom of the inner wall of the round tube (1). The driving base (34) is connected to the round tube (1). The measuring mechanism includes a first telescopic cylinder (41), a second telescopic cylinder (42), a probe (43), a first reset spring (44), and a second reset spring (45). The lower part of the drive base (34) is fixedly connected to four first telescopic cylinders (41), and each first telescopic cylinder (41) is fixedly connected to a round tube (1). Each first telescopic cylinder (41) is connected to the round tube (1). The inner wall of each first telescopic cylinder (41) is slidably connected to a second telescopic cylinder (42). The second telescopic cylinder (42) is connected to the first telescopic cylinder (41). The inner wall of each second telescopic cylinder (42) is slidably connected to a probe (43). A first reset spring (44) is fixedly connected between each first telescopic cylinder (41) and the second telescopic cylinder (42). A second reset spring (45) is fixedly connected between each second telescopic cylinder (42) and the probe (43). The indicating mechanism includes a measuring support frame (51), a first horizontal circular shaft (52), a torsion spring (53), a rotating ring (54), a pointer (55), a coil (56), and a sealing column (57). Four measuring support frames (51) are fixedly connected to the upper part of the outer wall of the circular tube (1). A first horizontal circular shaft (52) is fixedly connected to each measuring support frame (51). A rotating ring (54) is rotatably connected to each first horizontal circular shaft (52). Each rotating ring (54) is engraved. The rotating ring (54) is fixedly connected to the first horizontal circular shaft (52) by a torsion spring (53). Each of the first horizontal circular shafts (52) is fixedly connected to one end by a pointer (55). Each of the rotating rings (54) is wound with a coil (56), and the coil (56) passes through the circular tube (1). The lower end of the coil (56) is fixedly connected to the probe (43). The drive piston (33) is fixedly connected to four sealed columns (57), and the coil (56) passes through the sealed columns (57).

2. The soil hardness measuring device for cultivated land according to claim 1, characterized in that, It also includes a blocking mechanism, which is set on the circular tube (1). The blocking mechanism includes a blocking ring (61), a connecting rod (63), a sliding paddle (64), and a directional plate (65). The lower part of the circular tube (1) is rotatably connected to the blocking ring (61). The blocking ring (61) has four measuring holes (62). The inner wall of the blocking ring (61) is fixedly connected to the connecting rod (63). The top of the connecting rod (63) is fixedly connected to the sliding paddle (64). The middle part of the circular tube (1) is fixedly connected to the directional plate (65). The directional plate (65) has a sliding groove, and the connecting rod (63) is slidably connected to the sliding groove of the directional plate (65).

3. The soil hardness measuring device for cultivated land according to claim 2, characterized in that, It also includes a support mechanism, which is set on the round tube (1). The support mechanism includes a triangular bracket (71), a connector (72), a second horizontal round shaft (73), a movable rod (74), a large spring (75), a fixed foot (76), and a fixed block (77). The upper part of the round tube (1) is fixedly connected to the triangular bracket (71). Three second horizontal round shafts (73) are fixedly connected to the triangular bracket (71). Each second horizontal round shaft (73) is rotatably connected to a connector (72). Each connector (72) is slidably connected to two movable rods (74) at its lower part. A large spring (75) is fixedly connected between each movable rod (74) and the connector (72). A fixed foot (76) is fixedly connected between the bottom of each pair of movable rods (74). A fixed block (77) is fixedly connected between the middle of each pair of movable rods (74).

4. The soil hardness measuring device for cultivated land according to claim 3, characterized in that, It also includes a spiral head (8), which is rotatably connected to the bottom of the round tube (1).

5. The soil hardness measuring device for cultivated land according to claim 4, characterized in that, It also includes anti-slip handles (9), and two anti-slip handles (9) are fixedly connected to the housing (2), and the two anti-slip handles (9) are arranged symmetrically.

6. A method of using a soil hardness measuring device according to any one of claims 1 to 5, comprising the following steps: Step 1: The staff places the device on the farmland where soil hardness testing is required. Then, the staff holds the round tube (1) and presses it down to insert the round tube (1) into the soil to a suitable depth. Step 2: The staff then starts the electric push rod (31). The telescopic rod of the electric push rod (31) pushes the drive piston (33) downward. The four second telescopic cylinders (42) and the probe (43) will move away from each other and insert into the soil. The movement of the probe (43) will pull the coil (56) to move. After the telescopic rod of the electric push rod (31) is fully extended, the pointer (55) will be inserted. The pointer will be on a certain scale of the rotating ring (54); Step 3: Then the staff will read and record the scales aligned with the four pointers (55), and then the telescopic rod of the electric push rod (31) will retract, the second telescopic cylinder (42) and the probe (43) will no longer pull the coil (56), the rotating ring (54) will rotate in the opposite direction to rewind and drive the coil (56) to move upward to reset; Step 4: After the telescopic rod of the electric push rod (31) has retracted, the staff will turn off the electric push rod (31), and then the staff will hold the round tube (1) and pull the round tube (1) out of the soil.

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