Soil compactness tester

Abstract

A soil compactness tester relates to the technical field of testing devices and comprises a tester shell, a driving seat is vertically lifted in the tester shell, a pressure sensor is fixed on the driving seat, a testing rod is vertically and fixedly connected to the detection end of the pressure sensor, a positioning column horizontally and slidably arranged is connected to the driving seat, and a clamping groove is formed in the positioning column. And the test rod is provided with a positioning groove matched with the positioning column. The problems that in the traditional technology, when a test rod moves downwards to test soil at different depths, the test rod always exerts pressure on a pressure sensor, so that the pressure value on the pressure sensor continuously changes, the pressure sensor is prone to fatigue and aging over time, the pressure detection precision of the pressure sensor is affected, and the test accuracy of the pressure sensor is affected are solved. And the service life of the pressure sensor is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a soil compaction tester. Background Art

[0002] As we all know, compacted soil can prevent water infiltration, reduce the utilization rate of fertilizers, affect plant root growth, and lead to crop yield reduction. Therefore, it is particularly important to know the compactness of the soil. However, there is currently no good instrument on the market that can easily and reliably detect the compactness of the soil, and it is impossible to better guide agricultural production and road construction.

[0003] A patent with announcement number CN201945587U is disclosed in the prior art. The solution includes a body, a handle, a transmission mechanism, a moving mechanism, a sensor, a test rod and a data display. The transmission mechanism is arranged inside the upper end of the body, and the moving mechanism is arranged in the middle of the body. The test head can be flexibly inserted into the soil of different depths according to actual needs. The measured data is transmitted to the data display through the sensor, which can clearly and conveniently achieve the test purpose.

[0004] As the existing technology is used, its shortcomings are gradually exposed, mainly in the following aspects: First, when the existing test rod moves down to different depths of soil testing, the test rod always applies pressure to the pressure sensor, which causes the pressure value on the pressure sensor to continuously change. Over time, the pressure sensor is prone to fatigue and aging, which not only affects the pressure detection accuracy of the pressure sensor, but also greatly reduces the service life of the pressure sensor.

[0005] Second, when the existing handheld detector is fixed, when the hardness of the soil is high, the detector is prone to displacement from the ground, which in turn causes the pressure value on the pressure sensor to change, affecting the test accuracy of the soil compaction.

[0006] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0007] In view of the defects in the prior art, the present invention provides a soil compaction tester to solve the problem that in the traditional technology, when the test rod is moved down to different depths of soil testing, the test rod always applies pressure to the pressure sensor, which causes the pressure value on the pressure sensor to continuously change. Over time, the pressure sensor is prone to fatigue and aging, which not only affects the pressure detection accuracy of the pressure sensor, but also greatly reduces the service life of the pressure sensor.

[0008] To achieve the above object, the present invention provides the following technical solutions: The soil compaction tester comprises a tester shell, a drive seat is vertically lifted inside the tester shell, a pressure sensor is fixed on the drive seat, a test rod is vertically fixed on the detection end of the pressure sensor, a positioning column is connected to the drive seat and is horizontally slidable, and a positioning groove matching the positioning column is provided on the test rod.

[0009] As an optimized solution, two foot plates are fixedly connected in parallel to the bottom of the tester housing, and each foot plate is respectively inserted with a limit column for vertical sliding, and a plurality of limit rods arranged to swing axially are arranged around the peripheral wall of the limit column.

[0010] As an optimized solution, the hinged end of the limit rod is located at the top, and the limit rod is swingably arranged from the vertical to the horizontal direction.

[0011] As an optimized solution, a conical positioning head is provided at the end of the positioning column, and the positioning groove is a conical groove.

[0012] As an optimized solution, a side plate is fixedly connected to the lower surface of the driving seat, a driving machine is fixedly connected to the side wall of the side plate, a screw rod is fixedly connected to the output shaft of the driving machine, and a screw hole matching the screw rod is opened on the positioning column.

[0013] As an optimized solution, a guide rod is horizontally fixedly connected to the area of ​​the side plate above the driving machine, a sliding seat is fixedly connected to the positioning column, and a sliding hole matching the guide rod is opened on the sliding seat.

[0014] As an optimized solution, a mounting groove is provided on the side wall of the limiting column corresponding to each limiting rod, and the hinged end of the limiting rod is located at the top of the mounting groove.

[0015] As an optimized solution, an installation channel is provided in the limit column, a swing rod is fixedly connected to the hinged end of the limit rod, a connecting hole connected to the installation channel is provided on the installation groove, the other end of the swing rod extends into the installation channel through the connecting hole, a driving sleeve is provided in the installation channel along the vertical lifting, a driving rod is fixedly connected to the outer wall of the driving sleeve corresponding to each swing rod, a rectangular sliding hole is provided on the driving rod, and a constraint column that is slidably constrained in the rectangular sliding hole is fixedly connected to the swing rod.

[0016] As an optimized solution, a rotating shaft is vertically rotatably installed in the installation channel, an external thread section is provided on the peripheral wall of the rotating shaft, and the driving sleeve is threadedly connected to the external thread section.

[0017] As an optimized solution, the upper end of the rotating shaft extends to above the limiting column and is fixedly connected to a turning handle.

[0018] As an optimized solution, a conical soil plug is fixedly connected to the lower end of the limiting column.

[0019] As an optimized solution, two lead screws are rotatably installed in parallel in the tester housing, and the drive seat is threadedly connected to the two lead screws.

[0020] As an optimized solution, two guide pillars are fixedly connected in parallel in the tester housing, the guide pillars and the lead screw are arranged alternately along the circumferential direction, and the drive seat is provided with guide holes matching the guide pillars.

[0021] As an optimized solution, the upper end of the tester housing is fixedly connected to a top seat, the lower end of the tester housing is fixedly connected to a base, and the two ends of the lead screw and the guide column are correspondingly connected to the top seat and the base.

[0022] As an optimized solution, a through hole is provided on the base to avoid the test rod.

[0023] As an optimized solution, a main shaft is vertically rotatably mounted on the top seat, a driving gear is fixedly connected to the main shaft, and driven gears meshing with the driving gear are rotatably mounted on the upper ends of the lead screws.

[0024] As an optimized solution, a frame is fixedly connected to the top seat, a driving bevel gear is rotatably mounted on the frame, and a driven bevel gear meshing with the driving bevel gear is fixedly connected to the upper end of the main shaft.

[0025] As an optimized solution, the active bevel gear is coaxially connected with a power source.

[0026] As an optimized solution, a cover shell covering the frame body is fixedly connected to the top seat, and an operation interface is provided on the top of the cover shell.

[0027] Compared with the prior art, the present invention has the following beneficial effects: By providing a positioning column for horizontal sliding on the driving seat, it is realized that in the process of downward movement of the test rod, when the test depth of the soil is not reached, the positioning column and the positioning groove are used to abut against each other to lock the test rod, so that there is no displacement between the test rod and the pressure sensor, which can effectively overcome the influence of the displacement of the test rod in the downward movement process on the pressure sensor, so that the pressure value on the pressure sensor is stable. When the compactness test depth is about to be reached, the positioning column and the positioning groove are separated, and the limit on the test rod is released. At this time, the displacement caused by the downward movement of the test rod will directly act on the pressure sensor, so that the pressure sensor can accurately test the compactness of soils at different depths, which not only improves the test accuracy of soil compactness, but also prolongs the service life of the pressure sensor. A foot plate is arranged at the bottom of the tester housing, and each foot plate is vertically slidably inserted with a limit column, so that the limit column is inserted into the soil, and the tester housing is supported with the assistance of the foot plate, thereby improving the support stability; In addition, a plurality of limit rods are arranged on the peripheral wall of the limit column and are arranged to swing along the axial direction. When the limit column is inserted into the soil, the limit rods are swung from vertical to horizontal, which can greatly increase the contact area with the soil. When the hardness of the soil is high, displacement between the tester housing and the ground is prevented, thereby improving the test accuracy of the soil compaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the drive seat of the present invention when viewed from above; Figure 3 It is a structural schematic diagram of the positioning column of the present invention; Figure 4 It is a structural schematic diagram of the limiting rod of the present invention.

[0030] In the figure: 1-test instrument housing; 2-driving seat; 3-pressure sensor; 4-test rod; 5-positioning column; 6-positioning groove; 7-side plate; 8-driving machine; 9-screw; 10-screw hole; 11-conical positioning head; 12-guide rod; 13-sliding seat; 14-screw; 15-guide column; 16-foot plate; 17-limiting column; 18-limiting rod; 19-connecting hole; 20-swinging rod; 21-driving sleeve; 22-driving rod; 23-rectangular sliding hole; 24-constraint column; 25-external threaded section; 26-rotating shaft; 27-installation channel; 28-turn handle; 29-retaining ring; 30-conical soil plug; 31-top seat; 32-base; 33-spindle; 34-driving gear; 35-driven gear; 36-driving bevel gear; 37-driven bevel gear. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0032] like Figures 1 to 4As shown, the soil compaction tester includes a tester housing 1, a driving seat 2 is vertically raised and lowered inside the tester housing 1, a pressure sensor 3 is fixed on the driving seat 2, a test rod 4 is vertically fixed to the detection end of the pressure sensor 3, a positioning column 5 is connected to the driving seat 2 and a positioning groove 6 matching the positioning column 5 is opened on the test rod 4.

[0033] Two pedal plates 16 are fixedly connected in parallel at the bottom of the tester housing 1. A limit column 17 is inserted and slidably mounted on each pedal plate 16 in a vertical direction. A plurality of limit rods 18 are arranged to swing along the axial direction around the peripheral wall of the limit column 17.

[0034] The hinged end of the limiting rod 18 is located at the top, and the limiting rod 18 is swingably arranged from the vertical to the horizontal direction.

[0035] A conical positioning head 11 is provided at the end of the positioning column 5, and the positioning groove 6 is a conical groove.

[0036] A side plate 7 is fixedly connected to the lower surface of the driving seat 2 , a driving machine 8 is fixedly connected to the side wall of the side plate 7 , a screw rod 9 is fixedly connected to the output shaft of the driving machine 8 , and a screw hole 10 matching the screw rod 9 is opened on the positioning column 5 .

[0037] A guide rod 12 is horizontally fixedly connected to the area of ​​the side plate 7 above the driving machine 8 , and a slide seat 13 is fixedly connected to the positioning column 5 . The slide seat 13 is provided with a slide hole matching the guide rod 12 .

[0038] A mounting groove is formed on the side wall of the limiting column 17 corresponding to each limiting rod 18 , and the hinged end of the limiting rod 18 is located at the top of the mounting groove.

[0039] An installation channel 27 is provided in the limit column 17, a swing rod 20 is fixedly connected to the hinged end of the limit rod 18, a connecting hole 19 connected to the installation channel 27 is provided on the installation groove, the other end of the swing rod 20 extends into the installation channel 27 through the connecting hole 19, a driving sleeve 21 is vertically raised and lowered in the installation channel 27, a driving rod 22 is fixedly connected to the outer wall of the driving sleeve 21 corresponding to each swing rod 20, a rectangular sliding hole 23 is provided on the driving rod 22, and a constraint column 24 that is slidably constrained in the rectangular sliding hole 23 is fixedly connected to the swing rod 20.

[0040] A rotating shaft 26 is vertically rotatably installed in the installation channel 27 . An external thread section 25 is provided on the peripheral wall of the rotating shaft 26 , and the driving sleeve 21 is threadedly connected to the external thread section 25 .

[0041] The upper end of the rotating shaft 26 extends to the upper side of the limiting column 17 and is fixedly connected to a turning handle 28 .

[0042] A conical soil inserting head 30 is fixedly connected to the lower end of the limiting column 17 .

[0043] Two lead screws 14 are rotatably installed in parallel in the tester housing 1 , and the drive seat 2 is threadedly connected to the two lead screws 14 .

[0044] Two guide pillars 15 are fixedly connected in parallel in the tester housing 1 . The guide pillars 15 and the lead screw 14 are arranged alternately along the circumferential direction. The driving seat 2 is provided with guide holes matching the guide pillars 15 .

[0045] The upper end of the tester housing 1 is fixedly connected to a top seat 31 , the lower end of the tester housing 1 is fixedly connected to a base 32 , and both ends of the lead screw 14 and the guide column 15 are connected to the top seat 31 and the base 32 respectively.

[0046] The base 32 is provided with a through hole for accommodating the test rod 4 .

[0047] A main shaft 33 is vertically rotatably mounted on the top seat 31 , a driving gear 34 is fixedly connected to the main shaft 33 , and a driven gear 35 meshing with the driving gear 34 is rotatably mounted on the upper end of the lead screw 14 .

[0048] A frame is fixedly connected to the top seat 31 , and a driving bevel gear 36 is rotatably mounted on the frame. A driven bevel gear 37 meshing with the driving bevel gear 36 is fixedly connected to the upper end of the main shaft 33 .

[0049] The driving bevel gear 36 is coaxially connected with a power source.

[0050] A cover shell covering the frame is fixedly connected to the top seat 31 , and an operation interface is arranged on the top of the cover shell.

[0051] A butt ring 29 is fixedly connected to the outer wall of the limiting column 17 near the upper end, and the butt ring 29 butts against the upper surface of the footrest plate 16 .

[0052] The working principle of this device is: By providing a positioning column 5 for horizontal sliding on the driving seat 2, it is realized that during the downward movement of the test rod 4, when the test depth of the soil is not reached, the driving machine 8 drives the screw 9 to rotate, and the screw 9 drives the positioning column 5 to move horizontally, and the conical positioning head 11 on the end of the positioning column 5 is inserted into the positioning groove 6 to lock the test rod 4, so that there is no displacement between the test rod 4 and the pressure sensor 3, which can effectively overcome the influence of the displacement of the test rod 4 during the downward movement on the pressure sensor 3, so that the pressure value on the pressure sensor 3 is stable; When the compactness test depth is about to be reached, the driving machine 8 drives the screw 9 to rotate in the opposite direction, and the screw 9 drives the positioning column 5 to move horizontally, and the conical positioning head 11 on the end of the positioning column 5 is disengaged from the positioning groove 6, releasing the limit on the test rod 4. At this time, the displacement caused by the downward movement of the test rod 4 will directly act on the pressure sensor 3, so that the pressure sensor 3 can accurately test the compactness of soils at different depths, which not only improves the test accuracy of soil compactness, but also prolongs the service life of the pressure sensor 3. A foot pedal 16 is arranged at the bottom of the tester housing 1, and each foot pedal 16 is vertically slidably inserted with a limit column 17, so that the limit column 17 is inserted into the soil. During the test, the foot pedal is stepped on by both feet, and the limit column 17 and the foot pedal 16 assist in supporting the tester housing 1, thereby improving the support stability. A plurality of limit rods 18 are provided around the peripheral wall of the limit column 17 and are swung in the axial direction. When the limit column 17 is inserted into the soil, the handle 28 is turned, the handle 28 drives the rotating shaft 26 to rotate, and the rotating shaft 26 drives the driving sleeve 21 to descend. The driving sleeve 21 uses the driving rod 22 and the swing rod 20 to swing the limit rod 18 from the vertical to the horizontal direction, which can greatly increase the contact area with the soil. When the hardness of the soil is high, the displacement between the tester housing 1 and the ground is prevented, thereby improving the test accuracy of the soil compaction degree. The hinged end of the limit rod 18 is located at the top, so that when the limit rod 18 swings from vertical to horizontal, the limit rod 18 will form a reaction force with the soil, and the reaction force will move the limit column 17 downward, further improving the firmness of the fixation of the tester housing 1.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. Soil compaction tester, characterized by: The tester comprises a housing (1), a driving seat (2) is vertically raised and lowered in the housing (1), a pressure sensor (3) is fixed on the driving seat (2), a testing rod (4) is vertically fixed on the detection end of the pressure sensor (3), a positioning column (5) is connected to the driving seat (2) and is arranged to slide horizontally, and a positioning groove (6) matching the positioning column (5) is formed on the testing rod (4).

2. The soil compaction tester according to claim 1, characterized in that: Two foot plates (16) are fixedly connected in parallel to the bottom of the tester housing (1), and a limit column (17) is inserted into each of the foot plates (16) in a vertically slidable manner. A plurality of limit rods (18) are provided on the peripheral wall of the limit column (17) so as to swing in the axial direction.

3. The soil compaction tester according to claim 2, characterized in that: The hinged end of the limiting rod (18) is located at the top, and the limiting rod (18) is swingably arranged from the vertical to the horizontal direction.

4. The soil compaction tester according to claim 1, characterized in that: A conical positioning head (11) is provided at the end of the positioning column (5), and the positioning groove (6) is a conical groove.

5. The soil compaction tester according to claim 1, characterized in that: The lower surface of the driving seat (2) is fixedly connected to a side plate (7), the side wall of the side plate (7) is fixedly connected to a driving machine (8), the output shaft of the driving machine (8) is fixedly connected to a screw rod (9), and the positioning column (5) is provided with a screw hole (10) matching the screw rod (9).

6. The soil compaction tester according to claim 5, characterized in that: A guide rod (12) is horizontally fixedly connected to the area of ​​the side plate (7) above the driving machine (8), a slide seat (13) is fixedly connected to the positioning column (5), and a slide hole matching the guide rod (12) is formed on the slide seat (13).

7. The soil compaction tester according to claim 3, characterized in that: A mounting groove is provided on the side wall of the limiting column (17) corresponding to each limiting rod (18), and the hinged end of the limiting rod (18) is located at the top of the mounting groove.

8. The soil compaction tester according to claim 7, characterized in that: A mounting channel (27) is provided in the limit column (17), a swing rod (20) is fixedly connected to the hinged end of the limit rod (18), a connecting hole (19) connected to the mounting channel (27) is provided on the mounting groove, the other end of the swing rod (20) passes through the connecting hole (19) and extends into the mounting channel (27), a driving sleeve (21) is provided in the mounting channel (27) for vertical lifting, a driving rod (22) is fixedly connected to the outer wall of the driving sleeve (21) corresponding to each swing rod (20), a rectangular sliding hole (23) is provided on the driving rod (22), and a restraining column (24) is fixedly connected to the swing rod (20) for sliding restraint in the rectangular sliding hole (23).

9. The soil compaction tester according to claim 8, characterized in that: A rotating shaft (26) is vertically rotatably mounted in the mounting channel (27), an external thread section (25) is provided on a peripheral wall of the rotating shaft (26), and the driving sleeve (21) is threadedly connected to the external thread section (25).

10. The soil compaction tester according to claim 9, characterized in that: The upper end of the rotating shaft (26) extends to the upper side of the limiting column (17) and is fixedly connected to a rotating handle (28); the lower end of the limiting column (17) is fixedly connected to a conical soil inserting head (30).

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