A large flow slide valve device, hydraulic piling system and piling machine

Abstract

The present invention discloses a large flow sliding valve device, a hydraulic pile driving system and a pile driving machine, and relates to the field of hydraulic technology. The large flow sliding valve device includes a main valve body, a main valve core, a first end cover and a second end cover, and the main valve body is provided with a mounting hole for installing the main valve core; the main valve body is provided with a first channel, a second channel, a third channel, a fourth channel and a return oil channel connected to the return oil tank, the first channel and the second channel are used to communicate with the upper chamber of the oil cylinder, and the third channel and the fourth channel are used to communicate with the lower chamber of the oil cylinder; the main valve core is movable between a first position and a second position along the axial direction; the main valve core is provided with a central channel. The large flow sliding valve device provided by the present invention, when lifting the hammer, the hydraulic oil flows from the first channel and the second channel in sequence through the central channel return oil channel and flows back to the return oil tank, and the oil returns quickly; when dropping the hammer, the differential connection flow is large, the pressure loss is small, the pressure difference between the upper and lower chambers is small, the hammer drops faster, and the hammer strikes more forcefully.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and more specifically to a large flow slide valve device. In addition, the present invention also relates to a hydraulic piling system including the large flow slide valve device and a piling machine including the hydraulic piling system. Background Art

[0002] Pile hammer is a commonly used pile driving machinery, which mainly includes diesel hammer, hydraulic hammer, vibratory hammer, steam hammer, electromagnetic hammer and other forms.

[0003] The hydraulic pile hammer relies on the hydraulic cylinder to lift and drop the hammer. When lifting the hammer, it is required to respond quickly, and the hydraulic oil in the upper chamber of the cylinder can quickly return to the oil tank, while the hydraulic oil in the lower chamber does not leak into the upper chamber. When dropping the hammer, the upper and lower chambers are required to quickly form a differential connection. The maximum drop speed of the hydraulic pile hammer reaches more than 5m / s, and the hydraulic valve that controls the differential is required to have a large flow and fast dynamic response speed.

[0004] At present, solenoid valves are generally used to control several groups of ordinary two-way cartridge valves for switching. The oil circuit is relatively complicated, and the opening and closing control response speed of the high-pressure and low-pressure pile valves is slow and the synchronization is poor. Especially when the end of the drop hammer begins to switch to the hammer lifting stage, the opening speed of the return oil cartridge valve is faster than that of the differentially controlled pile valve, which will cause part of the flow to be uncontrolled and affect the piling frequency of the hydraulic piling system.

[0005] In summary, how to provide a large flow slide valve device with fast oil return speed and large differential connection flow volume is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a large-flow sliding valve device. When lifting the hammer, the hydraulic oil flows from the first channel and the second channel in sequence through the central channel return oil channel and flows back to the return oil tank. The oil return is rapid, reducing pressure damage. When dropping the hammer, the hydraulic oil flows from the third channel and the fourth channel through the central channel to the first channel and the second channel. The differential connection flow rate is large, the pressure loss is small, the pressure difference between the upper and lower chambers is small, the hammer is dropped faster, and the hammering is more powerful.

[0007] Another object of the present invention is to provide a hydraulic piling system including the large-flow sliding valve device and a piling machine including the hydraulic piling system.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A large flow slide valve device, comprising:

[0010] The main valve body is provided with a mounting hole for mounting the main valve core; the main valve body is provided with a first channel, a second channel, a third channel, a fourth channel and an oil return channel connected to the oil return tank, the first channel and the second channel are used to communicate with the upper chamber of the oil cylinder, and the third channel and the fourth channel are used to communicate with the lower chamber of the oil cylinder;

[0011] The main valve core is movable along the axial direction between a first position and a second position; the main valve core is a hollow structure and is provided with a central channel;

[0012] A first end cover, sealed and connected to the main valve body and located at one axial end of the mounting hole;

[0013] A second end cover, sealed and connected to the main valve body, and located at the other axial end of the mounting hole;

[0014] When the oil cylinder moves upward, the main valve core is located at the first position, the first channel and the second channel are both connected to the central channel, and the central channel is connected to the oil return channel; the hydraulic oil flows from the first channel and the second channel in sequence through the central channel and the oil return channel and flows back to the oil return tank;

[0015] When the oil cylinder moves downward, the main valve core is located at the second position, the first channel, the second channel, the third channel, and the fourth channel are all connected to the central channel, the hydraulic oil enters the central channel from the third channel and the fourth channel, and flows out from the central channel to the first channel and the second channel.

[0016] Optionally, the main valve core is provided with a first communicating hole and a second communicating hole penetrating through its side wall, and the first communicating hole and the second communicating hole are respectively provided at different positions in the axial direction of the main valve body; the second end cover is provided with a third through hole;

[0017] When the main valve core is located at the first position, the first communicating hole communicates with the first channel and the central channel; the second communicating hole communicates with the oil return channel and the central channel; the third through hole communicates with the second channel and the central channel;

[0018] When the main valve core is located at the second position, the main valve core moves toward one end of the second end cover to a position where the second channel and the fourth channel are connected to the mounting hole; the first connecting hole connects the first channel and the center channel; the second connecting hole connects the third channel and the center channel.

[0019] Optionally, the second end cover is provided with an insertion portion extending into the mounting hole, and the third through hole is provided in the insertion portion, and when the main valve core is located at the second position, the main valve core abuts against the first end cover; when the main valve core is located at the first position, the main valve core abuts against the insertion portion of the second end cover.

[0020] Optionally, a valve sleeve is provided between the main valve core and the main valve body and is sleeved on the outer periphery of the main valve core; the valve sleeve is provided with a first pilot control chamber and a second pilot control chamber for communicating with the pilot high-pressure oil circuit,

[0021] When the first pilot control chamber is connected to the pilot high-pressure oil circuit, the main valve core moves to the first position;

[0022] When the second pilot control chamber is connected to the pilot high-pressure oil circuit, the main valve core moves to the second position.

[0023] Optionally, the outer peripheral side surface of the main valve core is provided with a convex portion which can move between the axial position where the first pilot control chamber is located and the axial position where the second pilot control chamber is located;

[0024] The side of the convex portion facing the first end cover, the inner side wall of the valve sleeve, and the outer side wall of the main valve core are surrounded to form a first pressure chamber; the first pressure chamber is communicated with the first pilot control chamber;

[0025] The side of the convex portion facing the second end cover, the inner wall of the valve sleeve, and the outer wall of the main valve core are arranged to form a second pressure chamber; the second pressure chamber is communicated with the second pilot control chamber.

[0026] Optionally, when the main valve core is located at the second position, the main valve core abuts against the first end cover;

[0027] The surface of the first end cover that abuts against the main valve core is provided with a butterfly spring, a pad and a sleeve for fixing the butterfly spring, one end of the sleeve abuts against the valve sleeve, and the other end abuts against the pad, and the pad fits against the butterfly spring.

[0028] Optionally, the first channel, the third channel, the fourth channel, and the second channel are sequentially arranged in the main valve body along the axial direction of the mounting hole from an end close to the first end cover to an end close to the second end cover.

[0029] Optionally, the first channel, the second channel, the third channel, and the fourth channel are all annular grooves connected to the mounting hole.

[0030] A hydraulic piling system comprises any one of the large flow sliding valve devices described above.

[0031] A piling machine comprises the hydraulic piling system.

[0032] When the large flow sliding valve device provided by the present invention is used, when the oil cylinder moves upward to lift the hammer, the main valve core is located in the first position, the first channel and the second channel are both connected to the central channel, and the central channel is connected to the return oil channel; the hydraulic oil enters the central channel from the first channel and the second channel, and the hydraulic oil in the central channel flows out from the central channel to the return oil channel, and flows back to the return oil tank through the return channel. In this process, the hydraulic oil in the upper chamber of the oil cylinder can quickly return to the return oil mailbox, the oil return is rapid, the pressure in the upper chamber of the oil cylinder is quickly reduced, and the pressure in the lower chamber of the oil cylinder can be quickly lifted up by overcoming the gravity of the hammer core, which can effectively increase the frequency of piling.

[0033] When the oil cylinder moves downward to drop the hammer, the main valve core is located in the second position, the first channel, the second channel, the third channel, and the fourth channel are all connected to the central channel, the hydraulic oil enters the central channel from the third channel and the fourth channel, and flows out from the central channel to the first channel and the second channel, thereby entering the upper chamber of the oil cylinder; in this process, the upper and lower chambers of the oil cylinder can be differentially connected with a large flow rate, the pressure difference between the upper and lower chambers of the oil cylinder is small, and the hydraulic hammer falls rapidly under the action of the gravity of the hammer core, and the hammering is powerful.

[0034] In addition, the present invention also provides a hydraulic piling system including the large-flow sliding valve device and a piling machine including the hydraulic piling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 It is a cross-sectional schematic diagram of a main valve core in a large flow sliding valve device provided by the present invention being in a first position;

[0037] Figure 2 It is a cross-sectional schematic diagram of the main valve core in the large flow sliding valve device provided by the present invention being in the second position;

[0038] Figure 3 This is an enlarged view of a local position of a large flow slide valve device provided by the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of disc spring.

[0040] Figure 1-Figure 4 middle:

[0041] 1-first end cover, 2-disc spring, 3-screw, 4-stop sleeve, 5-first pilot control chamber, 6-main valve body, 7-valve sleeve, 8-second pilot control chamber, 9-main valve core, 10-second end cover, 11-shim plate, 12-sleeve. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The core of the present invention is to provide a large-flow sliding valve device. When lifting the hammer, the hydraulic oil flows from the first channel and the second channel in sequence through the central channel return oil channel and flows back to the return oil tank, and the oil return is rapid; when dropping the hammer, the hydraulic oil flows from the third channel and the fourth channel through the central channel to the first channel and the second channel. The differential connection flow rate is large, the pressure loss is small, the pressure difference between the upper and lower chambers is small, the hammer drops faster, and the hammer strikes more forcefully.

[0044] Another object of the present invention is to provide a hydraulic piling system including the large-flow sliding valve device and a piling machine including the hydraulic piling system.

[0045] In a specific embodiment, the large flow sliding valve device includes a main valve body 6, a main valve core 9, a first end cover 1 and a second end cover 10, wherein the main valve body 6 is provided with a mounting hole for mounting the main valve core 9; the main valve body 6 is provided with a first channel, a second channel, a third channel, a fourth channel and a return oil channel connected to the return oil tank, the first channel and the second channel are used to communicate with the upper chamber of the oil cylinder, and the third channel and the fourth channel are used to communicate with the lower chamber of the oil cylinder; the main valve core 9 is movable between a first position and a second position along the axial direction; the main valve core 9 is a hollow structure and is provided with a central channel; the first end cover 1 is sealed and connected to the main valve body 6 and is located one end of the axial direction of the mounting hole; the second end cover 10 is sealed and connected to the main valve body 6 and is located at the other end of the axial direction of the mounting hole; when the oil cylinder moves upward, the main valve core 9 is located in the first position, the first channel and the second channel are both connected to the center channel, and the center channel is connected to the return oil channel; the hydraulic oil flows from the first channel and the second channel in sequence through the center channel return oil channel and flows back to the return oil tank; when the oil cylinder moves downward, the main valve core 9 is located in the second position, the first channel, the second channel, the third channel, and the fourth channel are all connected to the center channel, the hydraulic oil enters the center channel from the third channel and the fourth channel, and flows out from the center channel to the first channel and the second channel.

[0046] It needs to be explained that if Figure 1As shown, in this specific embodiment, the first end cover 1 is fastened to one end of the mounting hole in the main valve body 6 by means of screws 3, and a first sealing ring is provided between the end surface of the first end cover 1 for contacting the main valve body 6 and the main valve body 6.

[0047] The second end cover 10 is buckled on the other end of the mounting hole in the main valve body 6, and part of the second end cover 10 extends into the mounting hole. A second sealing ring is arranged between the outer peripheral side surface of the part of the second end cover 10 extending into the mounting hole and the inner side wall of the mounting hole to realize a sealed connection between the second end cover 10 and the side wall of the mounting hole of the main valve body 6.

[0048] When the large flow slide valve device provided in this specific embodiment is used, when the oil cylinder moves upward to lift the hammer, the main valve core 9 is located in the first position, the first channel and the second channel are both connected to the central channel, and the central channel is connected to the return oil channel; the hydraulic oil enters the central channel from the first channel and the second channel, and the hydraulic oil in the central channel flows out from the central channel to the return oil channel, and flows back to the return oil tank through the return channel. In this process, the hydraulic oil in the upper chamber of the oil cylinder can quickly return to the return oil mailbox, the oil return is rapid, the pressure in the upper chamber of the oil cylinder is quickly reduced, and the pressure in the lower chamber of the oil cylinder can be quickly lifted up by overcoming the gravity of the hammer core, which can effectively increase the frequency of piling.

[0049] When the oil cylinder moves downward to drop the hammer, the main valve core 9 is in the second position, the first channel, the second channel, the third channel, and the fourth channel are all connected to the central channel, the hydraulic oil enters the central channel from the third channel and the fourth channel, and flows out from the central channel to the first channel and the second channel, thereby entering the upper chamber of the oil cylinder; in this process, the upper and lower chambers of the oil cylinder can be differentially connected with a large flow rate, and the pressure difference between the upper and lower chambers of the oil cylinder is small. Under the action of the gravity of the hammer core, the hydraulic hammer falls quickly and hammers forcefully.

[0050] It should be noted that, in this specific embodiment, the first channel, the second channel, the third channel, the fourth channel and the central channel can be connected through the through hole on the main valve core 9, and related connecting pipelines can also be set to achieve the connection between the first channel, the second channel, the third channel, the fourth channel and the central channel.

[0051] On the basis of the above embodiments, a first connecting hole and a second connecting hole penetrating through the side wall of the main valve core 9 can be provided, and the first connecting hole and the second connecting hole are respectively arranged at different axial positions of the main valve body 6; the second end cover 10 is provided with a third through hole; when the main valve core 9 is in the first position, the first connecting hole connects the first channel and the center channel; the second connecting hole connects the return oil channel and the center channel; the third through hole connects the second channel and the center channel; when the main valve core 9 is in the second position, the main valve core 9 moves toward one end of the second end cover 10 to a position where the second channel and the fourth channel are both connected to the mounting hole; the first connecting hole connects the first channel and the center channel; the second connecting hole connects the third channel and the center channel.

[0052] Specifically, the first channel, the third channel, the fourth channel, and the second channel can be sequentially arranged in the main valve body 6 along the axial direction of the mounting hole from the end close to the first end cover 1 to the end close to the second end cover 10, as shown in FIG. Figure 1 , Figure 2 shown.

[0053] The first channel, the second channel, the third channel, and the fourth channel are all annular grooves connected to the mounting hole. Of course, the first channel, the second channel, the third channel, and the fourth channel can also be arc-shaped grooves, which are determined according to actual conditions and will not be elaborated here.

[0054] like Figure 1 , Figure 2 As shown, the second end cover 10 is provided with an insertion portion extending into the mounting hole, and the third through hole is provided in the insertion portion. When the main valve core 9 is located in the second position, the main valve core 9 abuts against the first end cover 1; when the main valve core 9 is located in the first position, the main valve core 9 abuts against the insertion portion of the second end cover 10.

[0055] like Figure 1 , Figure 2 As shown, a valve sleeve 7 is arranged between the main valve core 9 and the main valve body 6 and is sleeved on the outer periphery of the main valve core 9; the valve sleeve 7 is provided with a first pilot control chamber 5 and a second pilot control chamber 8 for communicating with the pilot high-pressure oil circuit. When the first pilot control chamber 5 is connected to the pilot high-pressure oil circuit, the main valve core 9 moves to the first position; when the second pilot control chamber 8 is connected to the pilot high-pressure oil circuit, the main valve core 9 moves to the second position.

[0056] Furthermore, a stopper sleeve 4 may be provided, one end of which abuts against the valve sleeve 7 , and the other end of which abuts against the step of the first end cover 1 .

[0057] Specifically, a mounting groove for mounting a third sealing ring may be provided on the outer peripheral side of the valve sleeve 7 , and the outer side wall of the third sealing ring contacts the inner side wall of the mounting hole to achieve a sealed connection between the valve sleeve 7 and the side wall of the mounting hole of the main valve body 6 .

[0058] Furthermore, a convex portion that can move between the axial position of the first pilot control chamber 5 and the axial position of the second pilot control chamber 8 can be provided on the outer peripheral side of the main valve core 9; the convex portion is arranged on the side facing the first end cover 1, the inner wall of the valve sleeve 7, and the outer wall of the main valve core 9 to form a first pressure chamber; the first pressure chamber is connected with the first pilot control chamber 5; the convex portion is arranged on the side facing the second end cover 10, the inner wall of the valve sleeve 7, and the outer wall of the main valve core 9 to form a second pressure chamber; the second pressure chamber is connected with the second pilot control chamber 8.

[0059] In actual use, when the first pilot control chamber 5 is connected to the pilot high-pressure oil circuit, the pressure of the hydraulic oil in the first pressure chamber increases, pushing the main valve core 9 to move toward the second end cover 10 to the first position, such as Figure 1 As shown, at this time, the oil cylinder is moving upward and is in the state of lifting the hammer. The first channel is connected to the central channel through the first connecting hole, the second channel is connected to the central channel through the third connecting hole, and the return oil channel is connected to the central channel through the second connecting hole; the hydraulic oil in the first channel enters the central channel through the first connecting hole, the hydraulic oil in the second channel enters the central channel through the third connecting hole, and the hydraulic oil entering the central channel flows out to the return oil channel through the second connecting hole, and flows out from the return oil channel. In this state, the third channel and the fourth channel are in a closed state, without leakage, and without loss of high-pressure oil flow. At this time, the pressure in the upper chamber of the oil cylinder is very small, and the pressure in the lower chamber of the oil cylinder only needs to overcome the gravity of the hammer core to quickly lift it up.

[0060] In actual use, when the second pilot control chamber 8 is connected to the pilot high-pressure oil circuit, the pressure of the hydraulic oil in the second pressure chamber increases, pushing the main valve core 9 to move toward the first end cover 1 to the second position, such as Figure 2 As shown, at this time, the oil cylinder moves downward and is in a hammer-dropping state. The first channel is connected to the central channel through the first connecting hole, the main valve core 9 is separated from the second end cover 10, the third channel is connected to the central channel through the second connecting hole, the second channel and the fourth channel are both connected to the mounting hole, and through holes are provided at both ends of the axial direction of the main valve core 9 to connect the central channel with the mounting hole; the hydraulic oil in the third channel enters the central channel through the second connecting hole, and the hydraulic oil entering the central channel flows out to the first channel through the first connecting hole; the hydraulic oil in the fourth channel flows out to the mounting hole connected to the central channel, and the hydraulic oil entering the mounting hole flows out to the second channel. In this state, the upper and lower chambers of the oil cylinder can be differentially connected with a large flow rate, and the pressure difference between the upper and lower chambers of the oil cylinder is small. Under the action of the gravity of the hammer core, the hydraulic hammer falls quickly and hammers powerfully.

[0061] In a specific embodiment, when the main valve core 9 is in the second position, the main valve core 9 abuts against the first end cover 1; a butterfly spring, a gasket 11 and a sleeve 12 for fixing the butterfly spring are provided on the surface of the first end cover 1 for abutting against the main valve core 9, one end of the sleeve 12 abuts against the stopper sleeve 4, and the other end abuts against the gasket 11, and the gasket 11 fits against the butterfly spring. The specific structure of the butterfly spring is as follows Figure 4 shown.

[0062] In actual use, when the main valve core 9 moves quickly and hits the first end cover 1, it first hits the backing plate 11, and then transmits it to the disc spring 2. The disc spring 2 is compressed and deformed, absorbing the kinetic energy of the main valve core 9, which is converted into elastic potential energy of the disc spring 2 until the main valve core 9 stops when the elastic force of the disc spring 2 and the driving force generated by the pilot pressure of the main valve core 9 are balanced, completing a buffering process. In this process, the kinetic energy of the main valve core 9 is absorbed by the disc spring 2, and the impact energy on the first end cover 1 is reduced, effectively protecting the first end cover 1.

[0063] In addition to the above-mentioned large flow sliding valve device, the present invention also provides a hydraulic piling system including the large flow sliding valve device disclosed in the above-mentioned embodiment. The structures of other parts of the hydraulic piling system can be referred to the prior art and will not be described in detail herein.

[0064] The hydraulic piling system provided in this specific embodiment can effectively increase the corresponding speed and reduce the pressure loss during the actual piling process, thereby improving the hammering efficiency of the hydraulic hammer.

[0065] In addition to the above-mentioned large-flow sliding valve device, the present invention also provides a piling machine including the hydraulic piling system disclosed in the above-mentioned embodiment. For the structures of other parts of the piling machine, please refer to the prior art and will not be described in detail herein.

[0066] The piling machine provided in this specific embodiment can be a hole-driving pile driver or a common pile driver, which is determined according to actual conditions and will not be elaborated here.

[0067] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0068] The large flow slide valve device, hydraulic piling system and piling machine provided by the present invention are introduced in detail above. The principle and implementation mode of the present invention are explained by using specific examples in this article. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A large flow slide valve device, characterized in that: include: The main valve body (6) is provided with a mounting hole for mounting the main valve core (9); the main valve body (6) is provided with a first channel, a second channel, a third channel, a fourth channel and an oil return channel connected to the oil return tank, the first channel and the second channel are used to communicate with the upper chamber of the oil cylinder, and the third channel and the fourth channel are used to communicate with the lower chamber of the oil cylinder; The main valve core (9) is movable along the axial direction between a first position and a second position; the main valve core (9) is a hollow structure and is provided with a central channel; A first end cover (1) is sealingly connected to the main valve body (6) and is located at one axial end of the mounting hole; A second end cover (10) is sealingly connected to the main valve body (6) and is located at the other axial end of the mounting hole; When the oil cylinder moves upward, the main valve core (9) is located at the first position, the first channel and the second channel are both connected to the central channel, and the central channel is connected to the oil return channel; the hydraulic oil flows from the first channel and the second channel in sequence through the central channel and the oil return channel and flows back to the oil return tank; When the oil cylinder moves downward, the main valve core (9) is located at the second position, the first channel, the second channel, the third channel, and the fourth channel are all connected to the central channel, and the hydraulic oil enters the central channel from the third channel and the fourth channel, and flows out from the central channel to the first channel and the second channel; The main valve core (9) is provided with a first communicating hole and a second communicating hole penetrating through its side wall, the first communicating hole and the second communicating hole being arranged at different axial positions of the main valve body (6); the second end cover (10) is provided with a third through hole; When the main valve core (9) is located at the first position, the first communicating hole communicates with the first channel and the central channel; the second communicating hole communicates with the oil return channel and the central channel; and the third communicating hole communicates with the second channel and the central channel; When the main valve core (9) is located at the second position, the main valve core (9) moves toward one end of the second end cover (10) to a position where the second channel and the fourth channel are both connected to the mounting hole; the first connecting hole connects the first channel and the central channel; and the second connecting hole connects the third channel and the central channel; The first channel, the third channel, the fourth channel and the second channel are arranged in sequence on the main valve body (6) along the axial direction of the mounting hole from an end close to the first end cover (1) to an end close to the second end cover (10).

2. The large flow slide valve device according to claim 1, characterized in that: The second end cover (10) is provided with an insertion portion extending into the mounting hole, and the third through hole is provided in the insertion portion. When the main valve core (9) is located in the second position, the main valve core (9) abuts against the first end cover (1); when the main valve core (9) is located in the first position, the main valve core (9) abuts against the insertion portion of the second end cover (10).

3. The large flow slide valve device according to claim 1, characterized in that: A valve sleeve (7) is provided between the main valve core (9) and the main valve body (6) and is sleeved on the outer periphery of the main valve core (9); the valve sleeve (7) is provided with a first pilot control chamber (5) and a second pilot control chamber (8) for communicating with a pilot high-pressure oil circuit. When the first pilot control chamber (5) is connected to the pilot high-pressure oil circuit, the main valve core (9) moves to the first position; When the second pilot control chamber (8) is connected to the pilot high-pressure oil circuit, the main valve core (9) moves to the second position.

4. The large flow slide valve device according to claim 3, characterized in that: The outer peripheral side surface of the main valve core (9) is provided with a convex portion which can move between the axial position where the first pilot control chamber (5) is located and the axial position where the second pilot control chamber (8) is located; The side of the convex portion facing the first end cover (1), the inner wall of the valve sleeve (7), and the outer wall of the main valve core (9) are arranged to form a first pressure chamber; the first pressure chamber is communicated with the first pilot control chamber (5); The side of the convex portion facing the second end cover (10), the inner wall of the valve sleeve (7), and the outer wall of the main valve core (9) are arranged to form a second pressure chamber; the second pressure chamber is communicated with the second pilot control chamber (8).

5. The large flow slide valve device according to claim 3, characterized in that: When the main valve core (9) is located at the second position, the main valve core (9) abuts against the first end cover (1); A butterfly spring, a gasket (11) and a sleeve (12) are provided on a surface of the first end cover (1) for contacting with the main valve core (9); one end of the sleeve (12) contacts with the valve sleeve (7) and the other end contacts with the gasket (11); the gasket (11) is fitted with the butterfly spring.

6. The large flow slide valve device according to claim 1, characterized in that: The first channel, the second channel, the third channel, and the fourth channel are all annular grooves connected to the mounting hole.

7. A hydraulic piling system, characterized in that: The invention comprises a large flow sliding valve device as described in any one of claims 1 to 6.

8. A pile driving machine, characterized in that: Includes the hydraulic piling system as described in claim 7.

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