A grab hydraulic system capable of vibrating and grabbing soil

Abstract

The present invention discloses a grab hydraulic system capable of vibrating and grabbing soil, comprising: a first pipeline and a second pipeline, which are selectively connected to a pressure oil source and an oil tank respectively; a main push cylinder, whose piston rod is used to be connected with a grab to drive the grab to open or close the grab. The rodless cavity of the main push cylinder is connected to the first pipeline, and the rod chamber of the main push cylinder is connected to the second pipeline; a cycloid motor, a first switching valve is connected between its oil inlet and the first pipeline, and a second switching valve is connected between its oil outlet and the second pipeline. The first switching valve is used to control the on-off between the cycloid motor and the first pipeline, and the second switching valve is used to control the on-off between the cycloid motor and the second pipeline; the cycloid motor is connected with an eccentric block, and the eccentric block is connected with the grab, so that when the cycloid motor drives the eccentric block to rotate, the grab vibrates reciprocally along a preset direction. By superimposing vibration and impact while closing the grab, the grabbing force of the grab is improved, and the grab can adapt to harder rock and soil layers.

Description

Technical Field

[0001] The present invention relates to the technical field of grab hydraulic control, and more specifically, to a grab hydraulic system capable of vibrating and grabbing soil. Background Art

[0002] During the construction of foundation bases, hydraulic grabs play an important role. As a grooving construction equipment, hydraulic grabs are the main construction engineering machinery for the construction of diaphragm walls, retaining walls, and water retaining walls.

[0003] Hydraulic grabs are mainly applied to soft rock and soil with low strength such as silt, soft soil, and sandy soil. Existing hydraulic grabs only have the function of opening and closing, and their adaptability to the construction strata is poor. When facing a geological structure of a harder stratum, the "grabbing force" exerted by the existing hydraulic grab on the grabbed rock and soil during the soil-grabbing action is insufficient, and it is often "unable to grab", so it is difficult to construct in a harder rock and soil stratum and cannot be used for grooving construction. In this case, only other engineering equipment with very low construction efficiency can be selected to replace the construction.

[0004] Therefore, how to solve the problem that it is difficult for grabs to perform grooving construction on harder rock and soil strata during actual construction is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a grab hydraulic system capable of vibrating and grabbing soil, which can realize the grooving construction of the grab in a harder rock and soil stratum.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A grab hydraulic system capable of vibrating and grabbing soil, comprising:

[0008] A first pipeline and a second pipeline, which are respectively and switchably connected to a pressure oil source and a fuel tank;

[0009] A main push oil cylinder, whose piston rod is used to be connected to the grab to drive the grab to open or close. The rodless cavity of the main push oil cylinder is connected to the first pipeline, and the rod cavity of the main push oil cylinder is connected to the second pipeline;

[0010] A cycloidal motor, a first switching valve is connected between its oil inlet and the first pipeline, a second switching valve is connected between its oil outlet and the second pipeline. The first switching valve is used to control the on-off between the cycloidal motor and the first pipeline, and the second switching valve is used to control the on-off between the cycloidal motor and the second pipeline; the cycloidal motor is connected with an eccentric block, and the eccentric block is connected to the grab, so that when the cycloidal motor drives the eccentric block to rotate, the grab vibrates reciprocally along a preset direction.

[0011] Optionally, a proportional flow valve is connected between the oil inlet and the first switching valve.

[0012] Optionally, a relief valve is connected between the oil inlet and the oil outlet.

[0013] Optionally, a first one-way valve is connected between the oil inlet and the oil outlet, and the outlet of the first one-way valve is connected to the oil inlet.

[0014] Optionally, the relief valve and the first one-way valve are integrated into one body to form a make-up oil relief valve.

[0015] Optionally, the first switching valve and the second switching valve are combined into a two-position four-way valve.

[0016] Optionally, the number of the cycloidal motors is at least two. When the number of the cycloidal motors is an even number, all the cycloidal motors are respectively arranged on both sides of the grab in one-to-one correspondence.

[0017] Optionally, the first switching valve includes a first working position and a second working position. Among them, the first working position is the initial working position, and a second one-way valve is provided at the first working position. When the first switching valve is in the first working position, the second one-way valve disconnects the oil circuit flowing from the first pipeline to the cycloidal motor; when the first switching valve is in the second working position, the first pipeline and the cycloidal motor are in two-way conduction.

[0018] Optionally, the second switching valve includes a third working position and a fourth working position. Among them, the third working position is the initial working position, and a third one-way valve is provided at the third working position. When the second switching valve is in the third working position, the third one-way valve disconnects the oil circuit flowing from the second pipeline to the cycloidal motor; when the second switching valve is in the fourth working position, the second pipeline and the cycloidal motor are in two-way conduction.

[0019] Optionally, a pressure sensor for detecting the pressure of the rodless cavity is further included. The pressure sensor, the first switching valve and the second switching valve are respectively connected to a controller. When the pressure value detected by the pressure sensor is higher than a preset pressure trigger value, the controller controls the first switching valve and the second switching valve to switch to the open working position; when the pressure value detected by the pressure sensor is lower than the preset pressure trigger value, the controller controls the first switching valve and the second switching valve to switch to the closed working position.

[0020] The grab hydraulic system capable of vibrating and grabbing soil provided by the present invention. When the geological structure of the formation is relatively soft, both the first switching valve and the second switching valve are closed, so that the connection between the oil inlet of the cycloidal motor and the first pipeline is disconnected, and the connection between the oil outlet of the cycloidal motor and the second pipeline is disconnected. At this time, the hydraulic oil provided by the pressure oil source cannot flow from the first pipeline to the cycloidal motor, nor can it flow from the second pipeline to the cycloidal motor. At this time, the hydraulic control of the grab opening and closing is the same as that of the prior art. That is, when grabbing soil, the grab needs to be opened. At this time, when the first pipeline is connected to the pressure oil source, the second pipeline is connected to the fuel tank. The hydraulic oil provided by the pressure oil source flows through the first pipeline to the rodless cavity of the main push cylinder, pushing the soil grabbing mechanism of the grab to extend and closing the two bucket valves of the soil grabbing mechanism to grab rock and soil. When dumping soil, the grab needs to be closed. At this time, when the first pipeline is connected to the fuel tank, the second pipeline is connected to the pressure oil source. The hydraulic oil provided by the pressure oil source flows through the second pipeline to the rod cavity of the main push cylinder, pushing the soil grabbing mechanism of the grab to retract and opening the two bucket valves of the soil grabbing mechanism to dump the rock and soil.

[0021] When the geological structure of the formation is relatively hard, when grabbing soil, both the first switching valve and the second switching valve are opened, so that the connection between the oil inlet of the cycloidal motor and the first pipeline is conducted, and the connection between the oil outlet of the cycloidal motor and the second pipeline is conducted. At this time, the cycloidal motor and the propulsion cylinder are arranged in parallel and work simultaneously. That is, the hydraulic oil provided by the pressure oil source is divided into two through the first pipeline, forming two streams of hydraulic oil. One stream of hydraulic oil flows through the first switching valve and then to the cycloidal motor, driving the cycloidal motor to rotate, making the cycloidal motor drive the eccentric block to rotate, so that the eccentric block drives the grab to reciprocate and vibrate in a preset direction, generating vibration and impact. The other stream of hydraulic oil flows to the rodless cavity of the main push cylinder, pushing the soil grabbing mechanism of the grab to extend and closing the two bucket valves of the soil grabbing mechanism to grab rock and soil. When dumping soil, both the first switching valve and the second switching valve are closed, so that the connection between the oil inlet of the cycloidal motor and the first pipeline is disconnected, and the connection between the oil outlet of the cycloidal motor and the second pipeline is disconnected. At this time, the hydraulic control mode of the grab opening is the same as the opening mode when the geological structure of the formation is relatively soft as described above. That is, the hydraulic oil provided by the pressure oil source flows through the second pipeline to the rod cavity of the main push cylinder, pushing the soil grabbing mechanism of the grab to retract and opening the two bucket valves of the soil grabbing mechanism to dump the rock and soil.

[0022] It can be seen from this that the grab hydraulic system capable of vibrating and grabbing soil provided by the present invention can superimpose vibration and impact while closing the grab, thereby improving the grabbing force of the grab, enabling the grab to construct in rock and soil layers with higher strength, enhancing the adaptability of the grab to the formation, and being conducive to improving the construction efficiency. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 The hydraulic schematic diagram of the grab hydraulic system capable of vibrating and grabbing soil provided by a specific embodiment of the present invention.

[0025] Figure 1 The reference numerals in the figure are as follows:

[0026] 11 is the first pipeline, 12 is the second pipeline, 2 is the main push oil cylinder, 3 is the cycloid motor, 4 is the first switching valve, 41 is the second one-way valve, 5 is the second switching valve, 51 is the third one-way valve, 6 is the proportional flow valve, 7 is the oil replenishing overflow valve, 71 is the overflow valve, 72 is the first one-way valve, 8 is the pressure sensor, 9 is the hydraulic control one-way valve, and 10 is the balance valve. Detailed implementation manners

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0028] The core of the present invention is to provide a grab hydraulic system capable of vibrating and grabbing soil, which can realize the grooving construction of the grab in relatively hard rock and soil layers.

[0029] Please refer to Figure 1 , which is the hydraulic schematic diagram of the grab hydraulic system capable of vibrating and grabbing soil provided by a specific embodiment of the present invention.

[0030] The present invention provides a grab hydraulic system capable of vibrating and grabbing soil, which includes a first pipeline 11, a second pipeline 12, a main push oil cylinder 2, a cycloid motor 3, a first switching valve 4 and a second switching valve 5; the first pipeline 11 and the second pipeline 12 are respectively and switchably connected to a pressure oil source and a fuel tank correspondingly, that is, when the first pipeline 11 is connected to the pressure oil source, the second pipeline 12 is connected to the fuel tank; when the first pipeline 11 is connected to the fuel tank, the second pipeline 12 is connected to the pressure oil source; the main push oil cylinder 2 includes a piston rod, a rod chamber and a rodless chamber, the piston rod of the main push oil cylinder 2 is used to be connected to the grab to drive the grab to open or close the bucket, the rodless chamber of the main push oil cylinder 2 is connected to the first pipeline 11, and the rod chamber of the main push oil cylinder 2 is connected to the second pipeline 12; the first switching valve 4 is connected between the oil inlet of the cycloid motor 3 and the first pipeline 11, the second switching valve 5 is connected between the oil outlet of the cycloid motor 3 and the second pipeline 12, the first switching valve 4 is used to control the on-off between the oil inlet of the cycloid motor 3 and the first pipeline 11, and the second switching valve 5 is used to control the on-off between the oil outlet of the cycloid motor 3 and the second pipeline 12; the cycloid motor 3 is connected with an eccentric block, and the eccentric block is connected to the grab, so that when the cycloid motor 3 drives the eccentric block to rotate, the grab vibrates reciprocally along a preset direction.

[0031] It can be understood that when the geological structure of the formation is relatively soft, both the first switching valve 4 and the second switching valve 5 are closed, so that the connection between the oil inlet of the cycloid motor 3 and the first pipeline 11 is disconnected, and the connection between the oil outlet of the cycloid motor 3 and the second pipeline 12 is disconnected. At this time, the hydraulic oil provided by the pressure oil source cannot flow from the first pipeline 11 to the cycloid motor 3, nor can it flow from the second pipeline 12 to the cycloid motor 3; at this time, the hydraulic control of the grab opening and closing is the same as the prior art, that is, when grabbing soil, the grab needs to be opened. At this time, when the first pipeline 11 is connected to the pressure oil source, the second pipeline 12 is connected to the fuel tank, and the hydraulic oil provided by the pressure oil source flows through the first pipeline 11 to the rodless chamber of the main push oil cylinder 2, pushing the soil grabbing mechanism of the grab to extend and closing the two bucket valves of the soil grabbing mechanism to grab rock and soil; when dumping soil, the grab needs to be closed. At this time, when the first pipeline 11 is connected to the fuel tank, the second pipeline 12 is connected to the pressure oil source, and the hydraulic oil provided by the pressure oil source flows through the second pipeline 12 to the rod chamber of the main push oil cylinder 2, pushing the soil grabbing mechanism of the grab to retract and opening the two bucket valves of the soil grabbing mechanism to dump the rock and soil.

[0032] When the formation geological structure is relatively hard, during soil grabbing, both the first switching valve 4 and the second switching valve 5 are opened, so that the oil inlet of the cycloidal motor 3 is communicated with the first pipeline 11, and the oil outlet of the cycloidal motor 3 is communicated with the second pipeline 12. At this time, the cycloidal motor 3 and the propulsion cylinder are arranged in parallel and work simultaneously. That is, the hydraulic oil provided by the pressure oil source is divided into two through the first pipeline 11, forming two streams of hydraulic oil. One stream of hydraulic oil flows through the first switching valve 4 and then to the cycloidal motor 3, driving the cycloidal motor 3 to rotate, making the cycloidal motor 3 drive the eccentric block to rotate, so that the eccentric block drives the grab to reciprocate and vibrate in a preset direction, generating vibration and impact; the other stream of hydraulic oil flows to the rodless cavity of the main propulsion cylinder 2, pushing the soil-grabbing mechanism of the grab to extend and closing the two bucket flaps of the soil-grabbing mechanism to grab rock and soil. When dumping the soil, both the first switching valve 4 and the second switching valve 5 are closed, so that the connection between the oil inlet of the cycloidal motor 3 and the first pipeline 11 is disconnected, and the connection between the oil outlet of the cycloidal motor 3 and the second pipeline 12 is disconnected. At this time, the hydraulic control method for opening the grab is the same as the method for opening the grab when the formation geological structure is relatively soft above. That is, the hydraulic oil provided by the pressure oil source flows through the second pipeline 12 to the rod chamber of the main propulsion cylinder 2, pushing the soil-grabbing mechanism of the grab to retract and opening the two bucket flaps of the soil-grabbing mechanism to dump the rock and soil.

[0033] It can be seen from this that the grab hydraulic system capable of vibrating and grabbing soil provided by the present invention can superimpose vibration and impact while closing the grab, thereby improving the grabbing force of the grab, enabling the grab to construct in rock and soil layers with higher strength, enhancing the formation adaptability of the grab, and being beneficial to improving the construction efficiency.

[0034] In order to facilitate the adjustment of the vibration and impact frequencies of the grab, in some embodiments, a proportional flow valve 6 is connected between the oil inlet of the cycloidal motor 3 and the first switching valve 4. That is to say, in this embodiment, the flow rate of the hydraulic oil entering the cycloidal motor 3 is adjusted by adjusting the proportional flow valve 6, thereby adjusting the rotation speed of the cycloidal motor 3, and further controlling the vibration and impact frequencies of the grab, so as to adjust the vibration and impact force frequencies of the grab according to the actual requirements of the construction site, enabling the grab to adapt to rock and soil layers with different hardnesses and further enhancing the formation adaptability of the grab.

[0035] Considering the convenience of control, in some embodiments, the proportional flow valve 6 is an electro-hydraulic proportional flow valve 6.

[0036] In order to ensure that the cycloidal motor 3 does not overpressure during rotation, in some embodiments, a relief valve 71 is connected between the oil inlet and the oil outlet of the cycloidal motor 3. That is to say, in this embodiment, the relief valve 71 is connected in parallel between the oil inlet and the oil outlet of the cycloidal motor 3 to ensure that the pressure of the hydraulic oil entering the cycloidal motor 3 is within the set range, avoiding overpressure of the cycloidal motor 3 during rotation and playing a role in protecting the cycloidal motor 3.

[0037] Further, in order to prevent the cycloid motor 3 from continuing to rotate under the action of inertia after stopping and causing cavitation, in some embodiments, a first one-way valve 72 is connected between the oil inlet and the oil outlet of the cycloid motor 3, and the outlet of the first one-way valve 72 is connected to the oil inlet. That is to say, in this embodiment, the first one-way valve 72 is connected in parallel between the oil inlet and the oil outlet of the cycloid motor 3, so that the oil inlet and the oil outlet of the cycloid motor 3 are unidirectionally conductive. That is, the hydraulic oil can enter the oil inlet from the oil outlet of the cycloid motor 3. In this way, when the first switching valve 4 and the second switching valve 5 are closed and the supply of hydraulic oil to the cycloid motor 3 is cut off, when the cycloid motor 3 continues to rotate under the action of inertia, the hydraulic oil coming out of the oil outlet of the cycloid motor 3 can enter the oil inlet of the cycloid motor 3 to replenish the oil for the cycloid motor 3, preventing the cycloid motor 3 from cavitating, and thus avoiding damage to the cycloid motor 3.

[0038] Considering the convenience of assembly, in some embodiments, the overflow valve 71 and the first one-way valve 72 are integrated into one body to form a replenishing overflow valve 7. That is to say, the overflow valve 71 and the first one-way valve 72 in this embodiment are of an integrated structure. In this way, they can be assembled as a whole during assembly, simplifying the hydraulic oil circuit and facilitating installation.

[0039] In addition, considering the convenience of setting, in some embodiments, the first switching valve 4 and the second switching valve 5 are combined into a two-position four-way valve. That is to say, the first switching valve 4 and the second switching valve 5 in this embodiment are of an integrated structure. In this way, they can be assembled as a whole during assembly, simplifying the hydraulic oil circuit and facilitating installation.

[0040] In addition, in order to provide sufficient vibration and impact force to the grab, in some embodiments, the number of cycloid motors 3 is at least two. When the number of cycloid motors 3 is an even number, all the cycloid motors 3 are respectively arranged on both sides of the grab one by one. That is to say, in this embodiment, by setting a plurality of cycloid motors 3, multi-point vibration is generated on the grab, thereby improving the vibration and impact force of the grab. When the number of cycloid motors 3 is an even number, the cycloid motors 3 are arranged on both sides of the grab, which is beneficial to ensuring the balance of the grab vibration.

[0041] In some embodiments, the first switching valve 4 includes a first working position and a second working position. Among them, the first working position is the initial working position, and a second one-way valve 41 is provided at the first working position. When the first switching valve 4 is in the first working position, the second one-way valve 41 disconnects the oil path flowing from the first pipeline 11 to the cycloid motor 3; when the first switching valve 4 is in the second working position, the first pipeline 11 and the cycloid motor 3 are in two-way conduction. That is to say, the first working position is the position where the first switching valve 4 is closed, and the second working position is the position where the first switching valve 4 is opened. In this embodiment, by providing the second one-way valve 41 at the first working position, the second one-way valve 41 is used to achieve a one-way disconnection between the first pipeline 11 and the cycloid motor 3. That is, the outlet of the second one-way valve 41 is connected to the first pipeline 11. In this way, when the first switching valve 4 is in the first working position, it can ensure the complete cut-off of the hydraulic oil from the first pipeline 11 to the cycloid motor 3, achieving zero leakage, and the hydraulic oil can flow freely from the cycloid motor 3 to the first pipeline 11. In this way, it can be ensured that when the vibration impact function is not used, the hydraulic oil entering the main push cylinder 2 is completely isolated from the cycloid motor 3, avoiding the possible leakage of a certain amount of hydraulic oil into the cycloid motor 3 by a switching valve with a general spool valve structure function, thereby damaging the cycloid motor 3. In addition, for the first switching valve 4 with this structure, since the first working position is the initial working position, it can also ensure that even if the first switching valve 4 is damaged, the cycloid motor 3 will not be damaged due to continued operation of the grab to open and close the bucket.

[0042] Further, in some embodiments, the second switching valve 5 includes a third working position and a fourth working position. Among them, the third working position is the initial working position, and a third one-way valve 51 is provided at the third working position. When the second switching valve 5 is in the third working position, the third one-way valve 51 disconnects the oil path flowing from the second pipeline 12 to the cycloid motor 3; when the second switching valve 5 is in the fourth working position, the second pipeline 12 and the cycloid motor 3 are in two-way conduction. That is to say, the third working position is the position where the second switching valve 5 is closed, and the fourth working position is the position where the second switching valve 5 is opened. In this embodiment, by providing the third one-way valve 51 at the third working position, the third one-way valve 51 is used to achieve a one-way disconnection between the second pipeline 12 and the cycloid motor 3. That is, the outlet of the third one-way valve 51 is connected to the second pipeline 12. In this way, when the second switching valve 5 is in the third working position, it can ensure the complete cut-off of the hydraulic oil from the second pipeline 12 to the cycloid motor 3, achieving zero leakage, and the hydraulic oil can flow freely from the cycloid motor 3 to the second pipeline 12. In this way, it can be ensured that when the vibration impact function is not used, the hydraulic oil entering the main push cylinder 2 is completely isolated from the cycloid motor 3, avoiding the possible leakage of a certain amount of hydraulic oil into the cycloid motor 3 by a switching valve with a general spool valve structure function, thereby damaging the cycloid motor 3. In addition, for the second switching valve 5 with this structure, since the third working position is the initial working position, it can also ensure that even if the second switching valve 5 is damaged, the cycloid motor 3 will not be damaged due to continued operation of the grab to open and close the bucket.

[0043] In order to facilitate the control of the switching actions of the first switching valve 4 and the second switching valve 5, in some embodiments, a pressure sensor 8 for detecting the pressure in the rodless cavity of the main push cylinder 2 is further included. The pressure sensor 8, the first switching valve 4, and the second switching valve 5 are respectively connected to a controller. When the pressure value detected by the pressure sensor 8 is higher than the preset pressure trigger value, the controller controls the first switching valve 4 and the second switching valve 5 to switch to the open position; when the pressure value detected by the pressure sensor 8 is lower than the preset pressure trigger value, the controller controls the first switching valve 4 and the second switching valve 5 to switch to the closed position. That is to say, in this embodiment, the pressure in the rodless cavity of the main push cylinder 2 is detected by the pressure sensor 8 to control the actions of the first switching valve 4 and the second switching valve 5, thereby realizing the switching of the grab vibration working mode. It can be understood that when the pressure value detected by the pressure sensor 8 is lower than the preset pressure trigger value, the working mode of the grab is the normal working mode (that is, the open bucket and closed bucket modes); when the pressure value detected by the pressure sensor 8 is higher than the preset pressure trigger value, the vibration mode is triggered. At this time, the controller controls the first switching valve 4 and the second switching valve 5 to switch positions, so that both the first switching valve 4 and the second switching valve 5 are opened, so that the cycloid motor 3 and the main push cylinder 2 work simultaneously, realizing the function of the grab vibrating while grabbing soil.

[0044] It should be noted that the specific installation position of the pressure sensor 8 in this embodiment is not limited, as long as the pressure in the rodless cavity of the main push cylinder 2 can be detected. In some embodiments, the pressure sensor 8 is arranged on the oil path leading to the rodless cavity of the main push cylinder 2. For example, the pressure sensor 8 is arranged on the first pipeline 11.

[0045] In some embodiments, a pilot-operated check valve 9 is provided between the rodless cavity of the main push cylinder 2 and the first pipeline 11, and the outlet of the pilot-operated check valve 9 is connected to the rodless cavity of the main push cylinder 2.

[0046] In some embodiments, a balance valve 10 is provided between the rod chamber of the main push cylinder 2 and the second pipeline 12, and the balance valve 10 is connected to the inlet of the pilot-operated check valve 9.

[0047] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0048] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] The above has introduced in detail the grab hydraulic system capable of vibrating and grabbing soil provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A grab hydraulic system capable of vibrating and grabbing soil, characterized in that, Comprising: A first pipeline (11) and a second pipeline (12), which are respectively connected to a pressure oil source and an oil tank in a switchable manner; A main push cylinder (2), the piston rod of which is used to be connected to a grab to drive the grab to open or close, the rodless cavity of the main push cylinder (2) is connected to the first pipeline (11), and the rod chamber of the main push cylinder (2) is connected to the second pipeline (12); A cycloid motor (3), a first switching valve (4) is connected between its oil inlet and the first pipeline (11), a second switching valve (5) is connected between the oil outlet of the cycloid motor (3) and the second pipeline (12), the first switching valve (4) is used to control the on-off between the cycloid motor (3) and the first pipeline (11), and the second switching valve (5) is used to control the on-off between the cycloid motor (3) and the second pipeline (12); an eccentric block is connected to the cycloid motor (3), and the eccentric block is connected to the grab, so that when the cycloid motor (3) drives the eccentric block to rotate, the grab reciprocates along a preset direction.

2. The grab hydraulic system capable of vibrating and grabbing soil according to claim 1, wherein A proportional flow valve (6) is connected between the oil inlet and the first switching valve (4).

3. The grab hydraulic system capable of vibrating and grabbing soil according to claim 1, characterized in that A relief valve (71) is connected between the oil inlet and the oil outlet.

4. The grab hydraulic system capable of vibrating and grabbing soil according to claim 3, characterized in that, A first check valve (72) is connected between the oil inlet and the oil outlet, and the outlet of the first check valve (72) is connected to the oil inlet.

5. The grab hydraulic system capable of vibrating and grabbing soil according to claim 4, characterized in that, The relief valve (71) and the first check valve (72) are integrated into one body to form a make-up oil relief valve (7).

6. The grab hydraulic system capable of vibrating and grabbing soil according to claim 1, wherein The first switching valve (4) and the second switching valve (5) are combined into a two-position four-way valve.

7. The grab hydraulic system capable of vibrating and grabbing soil according to claim 1, characterized in that, The number of the cycloid motors (3) is at least two. When the number of the cycloid motors (3) is an even number, all the cycloid motors (3) are respectively arranged on both sides of the grab in a one-to-one correspondence.

8. The grab hydraulic system capable of vibrating and grabbing soil according to any one of claims 1-7, characterized in that, The first switching valve (4) includes a first working position and a second working position. Among them, the first working position is the initial working position, and a second check valve (41) is provided at the first working position. When the first switching valve (4) is in the first working position, the second check valve (41) disconnects the oil circuit flowing from the first pipeline (11) to the cycloid motor (3); when the first switching valve (4) is in the second working position, the first pipeline (11) and the cycloid motor (3) are bidirectionally conducted.

9. The grab hydraulic system capable of vibrating and grabbing soil according to any one of claims 1-7, characterized in that, The second switching valve (5) includes a third working position and a fourth working position. Among them, the third working position is the initial working position, and a third check valve (51) is provided at the third working position. When the second switching valve (5) is in the third working position, the third check valve (51) disconnects the oil circuit flowing from the second pipeline (12) to the cycloid motor (3); when the second switching valve (5) is in the fourth working position, the second pipeline (12) and the cycloid motor (3) are bidirectionally conducted.

10. The grab hydraulic system capable of vibrating and grabbing soil according to any one of claims 1-7, characterized in that, It further includes a pressure sensor (8) for detecting the pressure of the rodless cavity. The pressure sensor (8), the first switching valve (4) and the second switching valve (5) are respectively connected to a controller. When the pressure value detected by the pressure sensor (8) is higher than a preset pressure trigger value, the controller controls the first switching valve (4) and the second switching valve (5) to switch to the open position; When the pressure value detected by the pressure sensor (8) is lower than the preset pressure trigger value, the controller controls the first switching valve (4) and the second switching valve (5) to switch to the closed position.

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