Hydraulic device for controlling compactness of soil body

Abstract

The invention discloses a hydraulic device for controlling the compactness of a soil body, and belongs to the technical field of soil body test equipment. The hydraulic device for controlling the compactness of the soil body comprises a base, a mold and a pressurizing mechanism, and further comprises a guide rail, the fixed plate is arranged at the top of the guide rail; the sliding plate is provided with a first sliding hole and is in sliding connection with the guide rail through the first sliding hole; the bottom end of the stress ring abuts against the sliding plate, the top end of the stress ring abuts against the fixing plate, and the stress ring is used for detecting real-time extrusion force applied to the stress ring by the sliding plate; the pressing plate is provided with a second sliding hole, the pressing plate is in sliding connection with the guide rail through the second sliding hole, and the pressurizing mechanism is arranged below the sliding plate and used for applying extrusion force towards the fixing plate to the mold through the pressing plate. According to the hydraulic device for controlling the compactness of the soil body, the extrusion force applied to the mold filled with the soil body sample can be controlled, so that the compactness of the obtained soil body sample is controllable, and the same compactness of a plurality of prepared soil body samples can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of soil testing equipment, and in particular to a hydraulic device for controlling soil density. Background Art

[0002] The modern highway system is the foundation of highway transportation. Before the construction of a highway, it is necessary to investigate the geological conditions of the planned area and analyze the mechanical characteristics of the soil. This requires collecting soil samples from the strata and using these soil samples to conduct soil mechanics tests. When conducting a comparative test of soil mechanics after compaction, it is necessary to use the collected soil samples to make multiple soil samples with the same density.

[0003] The core components of the existing soil density hydraulic device include a mold and a pressurizing mechanism. The soil sample is loaded into the mold, and then the mold is pressurized by the pressurizing mechanism to compact the soil sample in the mold, thereby obtaining a compacted soil sample.

[0004] However, the existing soil density hydraulic device is difficult to ensure that multiple soil samples have the same density when preparing soil test samples. When conducting comparative tests on soil samples, the density differences of different soil samples will affect the authenticity of the soil test results. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and provide a hydraulic device for controlling the density of soil. When preparing soil test samples, the density of the obtained soil samples can be controlled, ensuring that the prepared multiple soil samples can have the same density, eliminating the influence of the density of the soil samples on the soil test results.

[0006] The present invention provides a hydraulic device for controlling soil density, comprising a base, a mold and a pressurizing mechanism, wherein the pressurizing mechanism is used to apply extrusion force to the mold, and the mold is used to hold a soil sample, and further comprises:

[0007] A guide rail is vertically arranged, and the bottom end of the guide rail is fixedly connected to the base;

[0008] A fixed plate, arranged at the top of the guide rail;

[0009] A slide plate is arranged below the fixed plate, the slide plate is provided with a first slide hole, and the slide plate is slidably connected to the guide rail through the first slide hole;

[0010] A stress ring is provided between the slide plate and the fixed plate, wherein the bottom end of the stress ring abuts against the slide plate, and the top end of the stress ring abuts against the fixed plate, and the stress ring is used to detect the real-time extrusion force applied to it by the slide plate;

[0011] A pressing plate is arranged below the slide plate, the pressing plate is provided with a second sliding hole, the pressing plate is slidably connected to the guide rail through the second sliding hole, the mold is arranged between the pressing plate and the slide plate, the pressing mechanism is arranged below the slide plate, and the pressing mechanism is used to apply an extrusion force to the mold toward the fixed plate.

[0012] Preferably, the fixed plate is provided with a vertical threaded rod, the threaded rod is threadedly connected with a nut sleeve, the nut sleeve is provided with a travel switch, the slide plate can abut against the travel switch, the travel switch is connected to the pressurizing mechanism, and when the travel switch is triggered, the pressurizing mechanism stops pressurizing.

[0013] Preferably, the pressurizing mechanism is a rocker jack, including a rocker, a hydraulic cylinder and a locking mechanism. The locking mechanism is arranged at the connection between the rocker and the hydraulic cylinder. The locking mechanism is connected to the travel switch. When the travel switch is triggered, the locking mechanism locks the rocker.

[0014] Preferably, the mold includes a bottom mold and a top mold, the bottom mold is fixed on the upper end surface of the pressure plate, the top mold is fixed on the lower end surface of the slide plate, the bottom mold is provided with a groove, the groove is used to hold the soil sample, and the lower end of the top mold is provided with a mold core, the bottom surface of the mold core is horizontally arranged, and the outer side wall of the mold core is in contact with the inner side wall of the groove.

[0015] Preferably, the mold core is provided with a plurality of vertical sliding holes, a plurality of pressure rings are provided below the mold core, a pressure rod is provided at the top of each pressure ring, a piston is provided at the top of each pressure rod, each pressure rod is slidably connected to a sliding hole through the piston thereon, each piston forms a cavity with the inner wall of the sliding hole in which it is located, each cavity is interconnected, and each cavity is filled with hydraulic oil.

[0016] Preferably, the pressure plate is arranged at the center of multiple pressure rings, and the multiple pressure rings are arranged concentrically, and the inner diameters of the multiple pressure rings increase successively. The pressure plate is arranged in the pressure ring with the smallest inner diameter, and each pressure ring is arranged in a pressure ring with a larger inner diameter than itself, and the side walls of two adjacent pressure rings are in contact with each other.

[0017] Preferably, an annular knife is provided at the top of the bottom mold, the bottom end of the annular knife abuts against the top of the bottom mold, the annular hole of the annular knife is connected with the groove, and the outer wall of the pressure ring with the largest outer diameter among the multiple pressure rings fits with the inner wall of the annular hole.

[0018] Preferably, a U-shaped groove is provided on the lower end surface of the slide plate, and the top end of the top mold is clamped in the U-shaped groove. A clamping mechanism is provided in the U-shaped groove, and the clamping mechanism is used to limit the sliding of the top mold relative to the U-shaped groove. The clamping mechanism is electrically connected to the travel switch. When the travel switch is triggered, the clamping mechanism releases the restriction on the position of the top mold.

[0019] Preferably, a spring is provided on the guide rail, the top end of the spring abuts against the fixed plate, and the bottom end of the spring abuts against the slide plate.

[0020] Preferably, the outer wall of the guide rail is provided with a wear-resistant coating.

[0021] Compared with the prior art, the beneficial effects of the present invention are: a hydraulic device for controlling soil density of the present invention can control the extrusion force applied to a mold containing soil samples when preparing soil test samples, so that the density of the obtained soil samples is controllable, ensuring that multiple prepared soil samples can have the same density, eliminating the influence of the density of the soil samples on the soil test results.

[0022] By setting a threaded rod and a travel switch, when the extrusion pressure on the stress ring reaches a predetermined value, the pressure mechanism can be controlled to stop pressurizing, thereby accurately controlling the extrusion pressure on the mold, so as to accurately control the density of the soil sample in the mold, and further ensure that the obtained multiple soil samples can ensure the same density. The travel switch controls the locking of the locking mechanism, so as to use the locking mechanism to lock the rocker to achieve the locking of the hydraulic cylinder position, thereby applying a constant extrusion pressure to the mold. Under the extrusion of the constant extrusion pressure, the density of the soil sample texture in the mold can be guaranteed, thereby further avoiding the influence of the difference of the soil sample on the soil test results. The bottom surface of the mold core is used to extrude the soil sample in the groove, and the outer wall of the mold core fits with the inner wall of the groove, which can prevent the leakage of the soil sample. In addition, since the bottom surface of the mold core is set horizontally, the flatness of the surface of the manufactured soil sample can be improved, thereby improving the quality of the soil sample. Under the pressure exerted by multiple pressure rings, the top of the soil sample is uneven, and the soil sample is added to the groove. After the new soil sample is re-compacted, the above operation is repeated until the top of the compacted soil sample in the groove is flat, so that the density of the obtained soil sample is uniform and the surface is flat, thereby further improving the quality of the soil sample produced by the device. By setting an annular knife, the annular knife can guide the deformation of the soil sample, ensuring that the soil sample is only subjected to vertical extrusion force, and after the compaction of the soil sample is completed, the top of the soil sample is flattened by using the lower edge of the annular knife, which can further ensure the flatness of the surface of the produced soil sample and improve the quality of the soil sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a left cross-sectional structural schematic diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the AA surface of the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the BB surface of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the present invention.

[0028] Description of reference numerals:

[0029] 101. base, 102. mold, 103. pressurizing mechanism, 104. guide rail, 105. fixed plate, 106. slide plate, 107. stress ring, 108. pressure plate, 201. threaded rod, 202. nut sleeve, 203. travel switch, 301. rocker, 302. hydraulic cylinder, 303. locking mechanism, 401. bottom mold, 402. top mold, 403. groove, 404. mold core, 501. sliding hole, 502. pressure ring, 503. pressure rod, 504. piston, 505. cavity, 6. annular knife, 701. U-shaped groove, 702. clamping mechanism, 8. spring. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-Figure 5 , the specific implementation of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] like Figure 1-Figure 5 As shown, the hydraulic device for controlling soil density provided by the present invention includes a base 101, a mold 102 and a pressurizing mechanism 103, wherein the pressurizing mechanism 103 is used to apply an extrusion force to the mold 102, and the mold 102 is used to hold a soil sample, and further includes: a guide rail 104, a fixing plate 105, a slide plate 106, a stress ring 107 and a pressing plate 108, wherein the guide rail 104 is vertically arranged, and the bottom end of the guide rail 104 is fixedly connected to the base 101; the fixing plate 105 is arranged at the top end of the guide rail 104; the slide plate 106 is arranged below the fixing plate 105, and the slide plate 106 is provided with a first sliding hole 501, and the slide plate 106 is slidably connected to the guide rail 104 through the first sliding hole 501 The stress ring 107 is connected between the slide plate 106 and the fixed plate 105, the bottom end of the stress ring 107 is in contact with the slide plate 106, and the top end of the stress ring 107 is in contact with the fixed plate 105, and the stress ring 107 is used to detect the real-time extrusion pressure applied to it by the slide plate 106; the pressing plate 108 is arranged below the slide plate 106, and the pressing plate 108 is provided with a second sliding hole 501, and the pressing plate 108 is slidably connected to the guide rail 104 through the second sliding hole 501, and the mold 102 is arranged between the pressing plate 108 and the slide plate 106, and the pressing mechanism 103 is arranged below the slide plate 106, and the pressing mechanism 103 is used to apply an extrusion force toward the fixed plate 105 to the mold 102.

[0032] The working principle of the above embodiment is briefly described:

[0033] When the device is in use, the soil sample is filled into the mold 102, and the mold 102 containing the soil sample is installed on the pressing plate 108. Then, the pressing mechanism 103 is used to drive the pressing plate 108 to move upward, and the guide rail 104 guides the movement of the pressing plate 108. The pressing plate 108 drives the mold 102 thereon to move upward, and the top of the mold 102 will abut against the slide plate 106. The pressing mechanism 103 is continued to drive the pressing plate 108 to move upward. The pressing plate 108 drives the mold 102 and the slide plate 106 to move upward. When the slide plate 106 moves upward, it squeezes the stress ring 107 located between the slide plate 106 and the fixed plate 105. When the stress ring 107 is squeezed, a pressure value will be displayed, and the pressure value is the same as the squeezing force applied to the pressing plate 108 by the pressing mechanism 103 and the squeezing force applied to the mold 102. As the pressurizing mechanism 103 operates, the extrusion pressure on the stress ring 107 increases, that is, the extrusion pressure on the mold 102 increases. When the extrusion pressure on the stress ring 107 reaches a predetermined value, the pressurizing mechanism 103 is controlled to stop operating, and the soil sample in the mold 102 is squeezed to a predetermined density. Then the mold 102 is taken out, and then the next mold 102 containing the soil sample is pressurized.

[0034] The hydraulic device for controlling soil density of the present invention can control the extrusion force applied to the mold 102 containing the soil sample when preparing the soil test sample, so that the density of the obtained soil sample can be controlled, thereby ensuring that the same density is achieved for the prepared multiple soil samples, eliminating the influence of the density of the soil sample on the soil test results.

[0035] On the basis of the above embodiment, in order to accurately control the density of the soil sample in the mold 102, it is further ensured that multiple soil samples can have the same density.

[0036] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a vertical threaded rod 201 is provided on the fixed plate 105, a nut sleeve 202 is threadedly connected to the threaded rod 201, a travel switch 203 is provided on the nut sleeve 202, the slide plate 106 can abut against the travel switch 203, and the travel switch 203 is connected to the pressurizing mechanism 103. When the travel switch 203 is triggered, the pressurizing mechanism 103 stops pressurizing.

[0037] When the pressurizing mechanism 103 drives the pressing plate 108 to move upward, the mold 102 moves upward with the pressing plate 108. When the mold 102 contacts the slide plate 106, the mold 102 drives the pressing plate 108 to move upward, and the pressing plate 108 moves upward relative to the threaded rod 201 until the pressing plate 108 contacts the travel switch 203 on the nut sleeve 202, and the travel switch 203 is triggered. At this time, the degree of stress deformation of the stress ring 107 reaches a predetermined value, and the extrusion force on the stress ring 107 reaches a predetermined value, that is, the extrusion force on the mold 102 reaches a predetermined value, and the density of the soil sample in the mold 102 reaches a predetermined value. By setting the threaded rod 201 and the travel switch 203, when the extrusion force on the stress ring 107 reaches a predetermined value, the pressurizing mechanism 103 can be controlled to stop pressurizing, thereby accurately controlling the extrusion force on the mold 102, so as to accurately control the density of the soil sample in the mold 102, and further ensure that the obtained multiple soil samples can ensure the same density.

[0038] As a preferred solution, Figure 1 and Figure 2 As shown, the pressurizing mechanism 103 is a rocker 301 type jack, including a rocker 301, a hydraulic cylinder 302 and a locking mechanism 303. The locking mechanism 303 is arranged at the connection between the rocker 301 and the hydraulic cylinder 302. The locking mechanism 303 is connected to the travel switch 203. When the travel switch 203 is triggered, the locking mechanism 303 locks the rocker 301. By using the jack as the pressurizing mechanism 103, when the pressurizing mechanism 103 is pressurized, the rocker 301 of the jack is shaken, thereby driving the hydraulic cylinder 302 to rise, thereby driving the pressing plate 108 to move upward, so as to squeeze the soil sample in the mold 102. When the travel switch 203 is triggered, the travel switch 203 controls the locking mechanism 303 to lock, so as to utilize the locking mechanism 303 to lock the rocker 301, and the rocker 301 cannot be shaken, thereby realizing the locking of the position of the hydraulic cylinder 302, thereby applying a constant extrusion pressure to the mold 102. Under the extrusion of the constant extrusion pressure, the density of the soil sample texture in the mold 102 can be guaranteed, thereby further avoiding the influence of the difference of the soil samples on the soil test results.

[0039] As a preferred solution, Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the mold 102 includes a bottom mold 401 and a top mold 402, the bottom mold 401 is fixed on the upper end surface of the pressure plate 108, and the top mold 402 is fixed on the lower end surface of the slide plate 106, the bottom mold 401 is provided with a groove 403, and the groove 403 is used to hold the soil sample, and the lower end of the top mold 402 is provided with a mold core 404, the bottom surface of the mold core 404 is horizontally arranged, and the outer wall of the mold core 404 is in contact with the inner wall of the groove 403. When the pressurizing mechanism 103 applies pressure to the mold 102 and the mold 102 is squeezed, the bottom mold 401 and the top mold 402 of the mold 102 move toward each other, and the mold core 404 on the top mold 402 moves into the groove 403, so that the soil sample in the groove 403 is squeezed by the bottom surface of the mold core 404, and the outer wall of the mold core 404 fits with the inner wall of the groove 403, which can prevent the soil sample from leaking from the groove 403 of the bottom mold 401, and because the bottom surface of the mold core 404 is set horizontally, the flatness of the surface of the manufactured soil sample can be improved, thereby improving the quality of the soil sample.

[0040] As a preferred solution, Figure 1-Figure 5As shown, the mold core 404 is provided with a plurality of vertical sliding holes 501, and the structures of the plurality of sliding holes 501 are the same. A plurality of pressure rings 502 are provided below the mold core 404, and a pressure rod 503 is provided at the top of each pressure ring 502, and a piston 504 is provided at the top of each pressure rod 503. Each pressure rod 503 is slidably connected with a sliding hole 501 through the piston 504 thereon, and each piston 504 forms a cavity 505 with the inner wall of the sliding hole 501 in which it is located, and each cavity 505 is interconnected, and each cavity 505 is filled with hydraulic oil. When the pressurizing mechanism 103 applies pressure to the mold 102, when the mold 102 is squeezed, the bottom mold 401 and the top mold 402 of the mold 102 move toward each other, and the mold core 404 on the top mold 402 moves into the groove 403. Since each cavity 505 is filled with hydraulic oil, the mold core 404 drives the piston 504 and the pressure rod 503 to move into the groove 403 through the hydraulic oil in the cavity 505, and the pressure rod 503 drives the pressure ring 502 connected thereto to move into the groove 403. Since the structures of the multiple sliding holes 501 are the same and each cavity 505 is interconnected, each pressure rod 503 applies the same pressure to the pressure ring 502 connected thereto, and each pressure ring 502 applies the same pressure to the soil sample directly below itself. When the density of the soil sample in the groove 403 is uneven, the top of the soil sample is uneven under the action of the pressure applied by the multiple pressure rings 502, and the soil sample is added to the groove 403. After the new soil sample is added, the top of the soil sample in the groove 403 is flattened again. At this time, in the originally compacted soil sample, more new soil samples are added to the top depressions, and fewer new soil samples are added to the top protrusions. After repeated pressure is applied by the multiple pressure rings 502, the unevenness of the top of the soil sample is reduced. The above operation is repeated until the top of the compacted soil sample in the groove 403 is flat. At this time, the density of the obtained soil sample is uniform and the surface is flat, thereby further improving the quality of the soil sample produced by the device.

[0041] As a preferred solution, Figure 3 As shown, the pressing plate 108 is arranged at the center of the plurality of pressing rings 502, the plurality of pressing rings 502 are arranged concentrically, the inner diameters of the plurality of pressing rings 502 are increased successively, the pressing plate 108 is arranged in the pressing ring 502 with the smallest inner diameter, each pressing ring 502 is arranged in the pressing ring 502 with a larger inner diameter than the pressing ring 502, and the side walls of two adjacent pressing rings 502 are in contact with each other. The plurality of pressing rings 502 are arranged as concentric circular rings, and since the inner diameters of the pressing rings 502 are increased successively, and the pressing plate 108 is arranged in the pressing ring 502 with the smallest inner diameter, when the density of the soil sample in the groove 403 of the bottom mold 401 is uneven, since each pressing rod 503 applies the same pressure to the pressing ring 502 connected thereto, under the squeezing of the soil sample by the pressing plate 108 and the plurality of pressing rings 502, the top of the soil sample is in the shape of a concentric step, which can ensure the uniform density of the soil sample in the groove 403.

[0042] As a preferred solution, Figure 1 and Figure 2 As shown, an annular knife 6 is provided at the top of the bottom mold 401, the bottom end of the annular knife 6 is in contact with the top of the bottom mold 401, the annular hole of the annular knife 6 is connected with the groove 403, and the outer wall of the pressure ring 502 with the largest outer diameter among the multiple pressure rings 502 is in contact with the inner wall of the annular hole. By providing the annular knife 6, when the soil sample in the groove 403 is squeezed by the multiple pressure rings 502, the annular knife 6 can guide the deformation of the soil sample, ensuring that the soil sample is only subjected to the squeezing force in the vertical direction, and after the compaction of the soil sample is completed, the top of the soil sample is flattened by the lower edge of the annular knife 6, which can further ensure the flatness of the surface of the manufactured soil sample and improve the quality of the soil sample.

[0043] As a preferred solution, Figure 2 and Figure 4 As shown, the lower end surface of the slide plate 106 is provided with a U-shaped groove 701, the top end of the top mold 402 is clamped in the U-shaped groove 701, and a clamping mechanism 702 is provided in the U-shaped groove 701. The clamping mechanism 702 is used to limit the sliding of the top mold 402 relative to the U-shaped groove 701. The clamping mechanism 702 is electrically connected to the travel switch 203. When the travel switch 203 is triggered, the clamping mechanism 702 releases the restriction on the position of the top mold 402. When the soil sample in the bottom mold 401 is squeezed, the top mold 402 is clamped in the U-shaped groove 701 by the clamping mechanism 702, which can prevent the top mold 402 from being deflected due to the force, thereby ensuring that the multiple pressure rings 502 on the top mold 402 can normally penetrate into the groove 403 of the bottom mold 401, ensuring the normal operation of the entire device, and also ensuring that the squeezing force applied by the multiple pressure rings 502 to the soil sample is in the vertical direction, thereby ensuring the uniformity of the density of the compacted soil sample. When the pressure mechanism 103 drives the pressing plate 108 to move upward until the pressing plate 108 abuts against the travel switch 203 on the nut sleeve 202, the travel switch 203 is triggered, the soil sample in the groove 403 is compacted, and the clamping mechanism 702 releases the restriction on the position of the top mold 402, so that the top mold 402 can be easily removed from the clamping slot, thereby improving the convenience of use of the device.

[0044] As a preferred solution, Figure 1 and Figure 2 As shown, a spring 8 is provided on the guide rail 104, the top end of the spring 8 abuts against the fixed plate 105, and the bottom end of the spring 8 abuts against the slide plate 106. By providing the spring 8, the spring 8 is used to apply a vertical downward elastic force to the slide plate. When the pressurizing mechanism 103 applies a vertical upward extrusion force to the slide plate, the spring 8 and the stress ring are stressed at the same time, so that the range of the stress ring can be increased.

[0045] As a preferred solution, Figure 1 and Figure 2 As shown, the outer wall of the guide rail 104 is provided with a wear-resistant coating. By providing the wear-resistant coating on the outer wall of the guide rail 104, the wear resistance of the guide rail 104 can be improved, thereby improving the service life of the entire device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic device for controlling soil density, comprising a base (101), a mold (102) and a pressurizing mechanism (103), wherein the pressurizing mechanism (103) is used to apply a squeezing force to the mold (102), and the mold (102) is used to hold a soil sample. It is characterized in that Also includes: A guide rail (104) is vertically arranged, and the bottom end of the guide rail (104) is fixedly connected to the base (101); A fixing plate (105) is arranged on the top of the guide rail (104); A slide plate (106) is disposed below the fixed plate (105), wherein the slide plate (106) is provided with a first slide hole (501), and the slide plate (106) is slidably connected to the guide rail (104) through the first slide hole (501); A stress ring (107) is arranged between the slide plate (106) and the fixed plate (105), wherein the bottom end of the stress ring (107) abuts against the slide plate (106), and the top end of the stress ring (107) abuts against the fixed plate (105), and the stress ring (107) is used to detect the real-time extrusion force applied to it by the slide plate (106); A pressing plate (108) is arranged below the slide plate (106), the pressing plate (108) is provided with a second sliding hole (501), the pressing plate (108) is slidably connected to the guide rail (104) through the second sliding hole (501), the mold (102) is arranged between the pressing plate (108) and the slide plate (106), the pressing mechanism (103) is arranged below the slide plate (106), and the pressing mechanism (103) is used to apply an extrusion force to the mold (102) toward the fixed plate (105).

2. The hydraulic device for controlling soil density according to claim 1, It is characterized in that The fixing plate (105) is provided with a vertical threaded rod (201), a nut sleeve (202) is threadedly connected to the threaded rod (201), a travel switch (203) is provided on the nut sleeve (202), the slide plate (106) can abut against the travel switch (203), the travel switch (203) is connected to the pressurizing mechanism (103), and when the travel switch (203) is triggered, the pressurizing mechanism (103) stops pressurizing.

3. The hydraulic device for controlling soil density according to claim 2, It is characterized in that The pressurizing mechanism (103) is a rocker (301) type jack, comprising a rocker (301), a hydraulic cylinder (302) and a locking mechanism (303). The locking mechanism (303) is arranged at the connection between the rocker (301) and the hydraulic cylinder (302). The locking mechanism (303) is connected to the travel switch (203). When the travel switch (203) is triggered, the locking mechanism (303) locks the rocker (301).

4. The hydraulic device for controlling soil density according to claim 1, It is characterized in that The mold (102) comprises a bottom mold (401) and a top mold (402), wherein the bottom mold (401) is fixed on the upper end surface of the pressing plate (108), and the top mold (402) is fixed on the lower end surface of the sliding plate (106). The bottom mold (401) is provided with a groove (403), and the groove (403) is used to hold the soil sample. The top mold (402) is provided with a mold core (404) at the lower end, and the bottom surface of the mold core (404) is arranged horizontally, and the outer wall of the mold core (404) is in contact with the inner wall of the groove (403).

5. The hydraulic device for controlling soil density according to claim 4, It is characterized in that The mold core (404) is provided with a plurality of vertical sliding holes (501), and the structures of the plurality of sliding holes (501) are the same. A plurality of pressure rings (502) are provided below the mold core (404), and a pressure rod (503) is provided at the top of each pressure ring (502), and a piston (504) is provided at the top of each pressure rod (503). Each pressure rod (503) is slidably connected to a sliding hole (501) through the piston (504) thereon, and each piston (504) and the inner wall of the sliding hole (501) in which it is located form a cavity (505), and each cavity (505) is interconnected, and each cavity (505) is filled with hydraulic oil.

6. The hydraulic device for controlling soil density according to claim 5, It is characterized in that The pressure plate (108) is arranged at the center of multiple pressure rings (502), and the multiple pressure rings (502) are concentrically arranged. The inner diameters of the multiple pressure rings (502) increase successively. The pressure plate (108) is arranged in the pressure ring (502) with the smallest inner diameter. Each pressure ring (502) is arranged in a pressure ring (502) with a larger inner diameter than itself, and the side walls of two adjacent pressure rings (502) are in contact with each other.

7. The hydraulic device for controlling soil density according to claim 6, It is characterized in that An annular knife (6) is provided at the top of the bottom mold (401), the bottom end of the annular knife (6) is in contact with the top of the bottom mold (401), the annular hole of the annular knife (6) is connected with the groove (403), and the outer wall of the pressure ring (502) with the largest outer diameter among the multiple pressure rings (502) is in contact with the inner wall of the annular hole.

8. The hydraulic device for controlling soil density according to claim 1, It is characterized in that A U-shaped groove (701) is provided on the lower end surface of the slide plate (106), and the top end of the top mold (402) is clamped in the U-shaped groove (701). A clamping mechanism (702) is provided in the U-shaped groove (701), and the clamping mechanism (702) is used to limit the top mold (402) from sliding relative to the U-shaped groove (701). The clamping mechanism (702) is electrically connected to the travel switch (203). When the travel switch (203) is triggered, the clamping mechanism (702) releases the restriction on the position of the top mold (402).

9. The hydraulic device for controlling soil density according to claim 1, It is characterized in that The guide rail (104) is provided with a spring (8), the top end of the spring (8) abuts against the fixed plate (105), and the bottom end of the spring (8) abuts against the slide plate (106).

10. The hydraulic device for controlling soil density according to claim 1, It is characterized in that The outer wall of the guide rail (104) is provided with a wear-resistant coating.

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