Slide valve device and mechanical equipment

Abstract

The invention provides a slide valve device and mechanical equipment. The slide valve device comprises a main valve body, a valve sleeve, a first valve cover, a second valve cover and a cylindrical valve element. A valve sleeve mounting hole and a valve element mounting hole are coaxially formed in the main valve body in the length direction of the main valve body. The cylindrical valve core slides between a first working position and a second working position in the valve core mounting hole along the axis of the cylindrical valve core; the valve sleeve comprises a first pipe sleeve and a second pipe sleeve, the valve sleeve is inserted into an inner cavity in one end of the main valve body in a sealed mode, and the second pipe sleeve is arranged in the valve sleeve installation hole and located between the main valve body and the cylindrical valve element. A positioning groove is formed in one end face of the main valve body, and one end of the first pipe sleeve is matched with the positioning groove; a positioning table is arranged in an inner cavity at the other end of the first pipe sleeve; the first valve cover extends to the positioning table and is hermetically connected with the other end of the first pipe sleeve; the second valve cover extends into an inner cavity at the other end of the main valve body and is in sealed connection with the main valve body; and the matching precision can be improved, and the service life of the sliding valve can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valves, and in particular to a sliding valve device and mechanical equipment. Background Art

[0002] At present, the hydraulic system of hydraulic pile hammer mainly uses cartridge valve as the control execution part. Generally, solenoid valves are used to control the switches of multiple groups of cartridge valves to achieve reversing switching. The control oil circuit is complex, the opening and closing response time of high-pressure and low-pressure cartridge valves is long, and the synchronization is unstable, resulting in partial flow and pressure loss. The hydraulic pile hammer system is not sufficient to meet the performance requirements of the construction site to maintain long-term, high-efficiency and stable construction.

[0003] A Chinese patent with patent number ZL202411238549.4 discloses a large-flow sliding valve device, which includes a main valve body, a cylindrical valve core, a first valve cover and a second valve cover. The main valve body is provided with multiple channels and a valve core mounting hole. The cylindrical valve core is provided with a central channel. The lifting and lowering of the pile hammer is achieved by controlling the cylindrical valve core to move axially between the first valve cover and the second valve cover. However, due to its structural reasons, the guide shaft of this patent is composed of a retaining sleeve and a valve sleeve. The valve sleeve, valve body and valve cover are all matched by seals. There is no positioning device. It is difficult to ensure the shape and position tolerance during the bolt fixing process, which affects the matching accuracy, and multiple sealing treatments are required, resulting in a complex structure. During disassembly and maintenance, the space between the pile frame and the valve body is limited, and the valve cover is too long, which is not conducive to the replacement of parts. The wear rate between the valve core and the retaining sleeve and valve sleeve is high, resulting in an increased risk of the cylindrical valve core getting stuck, and the failure rate is difficult to control.

[0004] Therefore, there is an urgent need for a sliding valve device and mechanical equipment that is easy to disassemble and assemble and can improve the matching accuracy and the life of the sliding valve. Summary of the invention

[0005] The purpose of the present invention is to provide a slide valve device, aiming to solve the technical problems that the traditional large-flow slide valve is difficult to disassemble and assemble, and the internal parts have low matching accuracy and short life.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides a sliding valve device, comprising a main valve body, a valve sleeve, a first valve cover and a second valve cover, and a cylindrical valve core;

[0007] The main valve body is provided with a valve sleeve mounting hole for mounting the valve sleeve and a valve core mounting hole for mounting the tubular valve core in sequence along its length; the tubular valve core slides along its axis between a first working position and a second working position in the valve core mounting hole;

[0008] The valve sleeve comprises a first sleeve and a second sleeve integrally connected with the first sleeve, the valve sleeve is sealed and inserted into the inner cavity of one end of the main valve body, the second sleeve is arranged in the valve sleeve installation hole and is located between the main valve body and the cylindrical valve core;

[0009] A positioning groove is provided on one end surface of the main valve body, and one end of the first pipe sleeve is matched with the positioning groove;

[0010] The inner cavity at the other end of the first sleeve is provided with a positioning platform, and the first valve cover extends to the positioning platform and is sealed and connected to the other end of the first sleeve;

[0011] The second valve cover extends into the inner cavity of the other end of the main valve body and is sealed and connected to the main valve body.

[0012] As a further improvement of the above scheme, the main valve body is provided with a first channel, a second channel, an oil return channel, a third channel and a fourth channel in sequence from the first valve cover to the second valve cover, the first channel and the fourth channel are used to communicate with the upper chamber of the hydraulic cylinder, the second channel and the third channel are used to communicate with the lower chamber of the hydraulic cylinder, and the oil return channel is used to communicate with the oil return tank;

[0013] The second passage and the oil return passage are separated by a first step;

[0014] The cylindrical valve core is provided with a first communication hole group and a second communication hole group in sequence from the first valve cover to the second valve cover;

[0015] The first communication hole group includes a plurality of first communication holes,

[0016] The second communicating hole group includes a plurality of second communicating holes, wherein the second communicating holes include a hole body and a cut-off hole extending toward the second valve cover end, the cut-off hole is integrally connected with the hole body, and the width and length of the cut-off hole are smaller than the width and length of the hole body;

[0017] A plurality of the first communicating holes and a plurality of the second communicating holes are evenly distributed along the circumference of the cylindrical valve core and are connected with the hollow inner cavity thereof;

[0018] The width of the oil return passage is greater than the width of the second communicating hole, and the width of the first step is greater than the width of the second communicating hole.

[0019] As a further improvement of the above solution, the extension end of the second valve cover is a hollow structure with an opening, and the outer wall of the extension end is provided with a third communication hole group, and a plurality of the third communication holes are evenly distributed along the circumference of the extension end and communicated with the hollow inner cavity thereof;

[0020] When the cylindrical valve core is located at the first working position, the first channel is connected to the inner cavity of the cylindrical valve core through the first connecting hole group; the oil return channel is connected to the inner cavity of the cylindrical valve core through the second connecting hole group; the fourth channel is connected to the inner cavity of the cylindrical valve core through the third connecting hole group;

[0021] When the cylindrical valve core is located at the second working position, the cylindrical valve core moves toward one end of the first valve cover to a position where the second channel and the third channel are both connected to the valve core mounting hole; the second channel and the inner cavity of the cylindrical valve core are connected through the second connecting hole group; the third channel and the inner cavity of the cylindrical valve core are directly connected;

[0022] During the switching process between the two working positions, when the second channel and the third channel are blocked, the high-pressure oil in the first channel and the fourth channel is partially connected to the oil return channel through the intercepting hole on the second connecting hole.

[0023] As a further improvement of the above solution, a first convex ring is provided on the outer wall of the second pipe sleeve, and the first convex ring is sealed and connected to the valve sleeve mounting hole; and the cavity between the second pipe sleeve and the valve sleeve mounting hole is divided into a first chamber and a second chamber;

[0024] A first pilot control chamber for communicating with a pilot high-pressure oil circuit is provided at the junction of the second pipe sleeve and the first pipe sleeve, the first pilot control chamber is communicated with the first chamber, and the second chamber constitutes a second pilot control chamber for communicating with the pilot high-pressure oil circuit;

[0025] When the first pilot control chamber is connected to the pilot high-pressure oil circuit, the cylindrical valve core moves to the first working position;

[0026] When the second pilot control chamber is connected to the pilot high-pressure oil circuit, the cylindrical valve core moves to the second working position.

[0027] As a further improvement of the above solution, the outer wall of the cylindrical valve core is provided with a second convex ring which can move between the axial position where the first pilot control cavity is located and the axial position where the second pilot control cavity is located;

[0028] The second convex ring faces one side of the first valve cover, and the inner side wall of the second pipe sleeve and the outer side wall of the cylindrical valve core are arranged to form a first pressure chamber; the first pressure chamber is communicated with the first pilot control chamber;

[0029] The second convex ring faces the side of the second valve cover, and the inner side wall of the second pipe sleeve and the outer side wall of the cylindrical valve core are arranged to form a second pressure chamber; the second pressure chamber is communicated with the second pilot control chamber.

[0030] As a further improvement of the above solution, a first pilot oil passage communicating with the first pilot control chamber and a second pilot oil passage communicating with the second pilot control chamber are provided on the side wall of the main valve body.

[0031] As a further improvement of the above solution, a first sealing assembly is provided between the first valve cover and the end surface of the other end of the first pipe sleeve;

[0032] A second sealing assembly is provided between one end of the first sleeve and the bottom of the positioning groove;

[0033] A third sealing assembly is provided between the first convex ring and the inner wall of the valve sleeve mounting hole.

[0034] A fourth sealing assembly is provided between the second valve cover and an end surface of the other end of the main valve body.

[0035] In a second aspect, the present invention further provides a mechanical device, comprising a sliding valve device as provided in the first aspect.

[0036] Since the present invention adopts the above technical solution, the beneficial effects of this application are:

[0037] 1. A sliding valve device provided by the present invention has a main valve body coaxially provided with a valve core mounting hole and a valve sleeve mounting hole in sequence, both of which can be integrally formed and processed; the inner wall of the valve sleeve is most likely to be worn by the valve core. In the present invention, the valve sleeve is provided with a first pipe sleeve and a second pipe sleeve in a segmented manner, the second pipe sleeve is arranged and installed in the valve sleeve mounting hole, a positioning groove is provided at one end of the main valve body, and one end of the first pipe sleeve is matched with the positioning groove; with such a setting, the valve sleeve serves as the only positioning and guiding component, and is integrally formed and processed to ensure the coaxiality between the inner and outer walls; the outer wall of the valve sleeve is coaxially arranged with the center of the main valve body, which can reduce the influence of fixing screws or human factors during the assembly process. , saving processing and assembly costs; the valve core mounting hole and the valve sleeve are both integrally formed, so after the valve core is assembled in the valve core mounting hole, the valve sleeve is installed to form a sliding fit with the valve core, which can effectively ensure the shape and position tolerances between the three; before the first valve cover is fixed, the matching of the three can be confirmed by pushing the valve core back and forth, which is convenient for adjustment at any time; thereby effectively ensuring the coaxiality between the cylindrical valve core, the valve sleeve, the valve sleeve mounting hole and the valve core mounting hole, making the assembly of the valve core more convenient and ensuring precise fit; thereby reducing the wear rate between the valve core and the valve sleeve, as well as between the valve core and the valve core mounting hole, reducing the risk of valve core jamming; improving the life and performance of the entire machine, and reducing the failure rate.

[0038] 2. A sliding valve device provided by the present invention, wherein the second communicating hole group includes a plurality of second communicating holes, wherein the second communicating holes include a hole body and a cut-off hole extending toward the second valve cover end, wherein the cut-off hole is integrally connected to the hole body, and the width and length of the cut-off hole are both smaller than the width and length of the hole body. With such a configuration, when the second channel and the third channel are blocked during the switching of the valve core between the two working positions, the upper and lower chambers of the hydraulic cylinder are completely closed for a moment, but the actuator connected thereto (such as a pile hammer) will still move upward due to inertia, and at this time, the hydraulic oil in the upper chamber of the hydraulic cylinder will be compressed. If it cannot be smoothly returned to the oil tank, the pressure will have an instantaneous peak value. The valve sleeve and the valve cover have an instant impact force, which damages the valve cover, the valve sleeve and the seals at the corresponding positions, thereby reducing the life of the sliding valve. In the present invention, since the second connecting hole is provided with a shut-off hole, a circle of annular variable-area shut-off grooves is formed on the valve core to ensure that during the switching process, the flow of the hydraulic cylinder is always connected to the lower chamber of the hydraulic cylinder or one of the return oil chambers, so that a small amount of flow can pass through to avoid the occurrence of pressure peaks, thereby preventing the valve core from generating a greater impact force. Therefore, there is no need to set a disc spring or other buffering parts at the valve cover as in a traditional sliding valve. The present invention makes the impact force controllable by avoiding the occurrence of pressure peaks, thereby improving the life and performance of the entire machine and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 It is a cross-sectional schematic diagram of a slide valve device disclosed in the present invention in a first working position;

[0041] Figure 2 It is a cross-sectional schematic diagram of a slide valve device disclosed in the present invention in a second working position;

[0042] Figure 3 for Figure 2 A local enlarged schematic diagram of the I direction;

[0043] Figure 4 It is a cross-sectional schematic diagram of a slide valve device disclosed in the present invention when switching between two working positions;

[0044] Figure 5 for Figure 4 Schematic diagram of a partial enlargement in the II direction.

[0045] Reference numerals:

[0046] 1. Main valve body; 11. Valve sleeve installation hole; 12. Valve core installation hole; 13. Positioning groove;

[0047] 14, first channel; 15, second channel; 16, oil return channel; 17, third channel; 18, fourth channel; 19, first step; 2, valve sleeve; 21, first pipe sleeve; 22, second pipe sleeve; 23, positioning platform; 24, first convex ring; 3, first valve cover; 4, second valve cover; 41, third communication hole; 5, cylindrical valve core; 51, first communication hole; 52, second communication hole; 53, intercepting hole; 54, second convex ring;

[0048] a, first pilot control chamber; b, second pilot control chamber; c, first chamber; d, second chamber; e, first pressure chamber; f, second pressure chamber.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] 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.

[0051] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0053] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] Example 1

[0055] See also Figure 1-Figure 5The present invention provides a sliding valve device, comprising a main valve body 1, a valve sleeve 2, a first valve cover 3 and a second valve cover 4, and a cylindrical valve core 5;

[0056] The main valve body 1 is processed with a coaxial valve sleeve 2 mounting hole 11 and a valve core mounting hole 12 along the length direction. The diameter of the valve sleeve 2 mounting hole 11 is larger than the valve core mounting hole 12, and the two are connected by a stepped transition surface.

[0057] The valve sleeve 2 adopts a split design, including a first pipe sleeve 21 and a second pipe sleeve 22. The first pipe sleeve 21 and the second pipe sleeve 22 are integrally formed by precision casting or integral processing to ensure a smooth transition of the inner cavity; the outer diameter of the second pipe sleeve 22 matches the mounting hole 11 of the valve sleeve 2, and is located between the main valve body 1 and the cylindrical valve core 5;

[0058] The end of the first sleeve 21 is provided with an annular flange, which is engaged with the positioning groove 13 on the end surface of the main valve body 1 and fixed by bolts to achieve axial positioning;

[0059] The outer wall of the cylindrical valve core 5 is in clearance fit with the valve core mounting hole 12, and the cylindrical valve core 5 slides along its axis between a first working position and a second working position in the valve core mounting hole 12; a through flow channel is provided inside the cylindrical valve core 5, and the flow guide path is switched by axial sliding of the valve core;

[0060] The inner cavity at the other end of the first sleeve 21 is provided with a positioning platform 23, and the first valve cover 3 extends to the positioning platform 23 and is sealed and connected with the other end of the first sleeve 21; the extension of the second valve cover 4 is embedded in the inner cavity at the other end of the main valve body 1, and is flange-connected and pre-tightened to ensure overall sealing; specifically, in this embodiment, a first sealing component is provided between the first valve cover 3 and the end surface of the other end of the first sleeve 21; a second sealing component is provided between one end of the first sleeve 21 and the bottom of the positioning groove 13; a fourth sealing component is provided between the second valve cover 4 and the end surface of the other end of the main valve body 1;

[0061] In the present invention, a valve core mounting hole 12 and a valve sleeve 2 mounting hole 11 are coaxially provided on the main valve body 1 in sequence, and both can be integrally formed and processed; the inner wall of the valve sleeve 2 is most likely to be worn by the valve core, and in the present invention, the valve sleeve 2 is provided with a segmented first pipe sleeve 21 and a second pipe sleeve 22, and the second pipe sleeve 22 is arranged and installed in the valve sleeve 2 mounting hole 11, and a positioning groove 13 is provided at one end of the main valve body 1, and one end of the first pipe sleeve 21 is matched with the positioning groove 13; with such a setting, the valve sleeve 2 is the only positioning and guiding component, and is integrally formed and processed to ensure the coaxiality between the inner and outer walls; the outer wall of the valve sleeve 2 is coaxially arranged with the center of the main valve body 1, which can reduce the influence of fixing screws or human factors during the assembly process. The valve core mounting hole 12 and the valve sleeve 2 are both integrally formed. Therefore, after the valve core is assembled in the valve core mounting hole 12, the valve sleeve 2 is installed to form a sliding fit with the valve core, which can effectively ensure the shape and position tolerances between the three. Before the first valve cover 3 is fixed, the matching of the three can be confirmed by pushing the valve core back and forth, which is convenient for adjustment at any time. Thus, the coaxiality between the cylindrical valve core 5, the valve sleeve 2, the valve sleeve 2 mounting hole 11 and the valve core mounting hole 12 can be effectively ensured, making the assembly of the valve core more convenient and ensuring precise fit. In addition, the wear rate between the valve core and the valve sleeve 2, as well as between the valve core and the valve core mounting hole 12, is reduced, and the risk of valve core jamming is reduced. The service life and performance of the whole machine are improved, and the failure rate is reduced.

[0062] As a preferred embodiment, in order to more clearly describe the inventive concept of the present invention, in this embodiment, the application of the slide valve device in a hydraulic piling hydraulic system is used as an example for explanation; the main valve body 1 is provided with a first channel 14, a second channel 15, an oil return channel 16, a third channel 17 and a fourth channel 18 in sequence from the first valve cover 3 to the second valve cover 4. The first channel 14 and the fourth channel 18 are used to communicate with the upper chamber of the hydraulic cylinder, the second channel 15 and the third channel 17 are used to communicate with the lower chamber of the hydraulic cylinder, and the oil return channel 16 is used to communicate with the oil return tank; when the hammer is lifted, the hydraulic oil flows from the first channel 14 and the fourth channel 18 in sequence through the central flow channel of the cylindrical valve core 5 and the oil return channel 16 to the oil return tank, and the oil return is rapid; when the hammer is dropped, the hydraulic oil flows from the second channel 15 and the third channel 17 through the central flow channel of the cylindrical valve core 5 to the first channel 14 and the fourth channel 18, 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;

[0063] The second channel 15 and the oil return channel 16 are separated by a first step 19;

[0064] The cylindrical valve core 5 is provided with a first group of communicating holes 51 and a second group of communicating holes 52 in sequence from the first valve cover 3 to the second valve cover 4;

[0065] The first communication holes 51 group includes a plurality of first communication holes 51,

[0066] See also Figure 3 The second communicating hole 52 group includes a plurality of second communicating holes 52, and the second communicating holes 52 include a hole body and a cut-off hole 53 extending toward the end of the second valve cover 4, and the cut-off hole 53 is integrally connected with the hole body, and the width and length of the cut-off hole 53 are smaller than the width and length of the hole body;

[0067] A plurality of the first communicating holes 51 and a plurality of the second communicating holes 52 are evenly distributed along the circumference of the cylindrical valve core 5 and are connected with the hollow inner cavity thereof;

[0068] The width of the oil return passage 16 is greater than the width of the second communicating hole 52 , and the width of the first step 19 is greater than the width of the second communicating hole 52 ;

[0069] With such a configuration, when the second channel 15 and the third channel 17 are blocked during the switching process between the two working positions of the valve core, the upper and lower chambers of the hydraulic cylinder are completely closed for a moment, but the actuator (such as a pile hammer) connected thereto will still move upward due to inertia. At this time, the hydraulic oil in the upper chamber of the hydraulic cylinder is compressed. If it cannot be smoothly returned to the oil tank, the pressure will have an instantaneous peak, which will produce an instantaneous impact force on the valve sleeve 2 and the valve cover, causing damage to the valve cover, the valve sleeve 2 and the seals at the corresponding positions, thereby reducing the life of the sliding valve; in the present invention, since the intercepting hole 53 is provided on the second connecting hole 52, a circle of annular variable area intercepting grooves is formed on the valve core, ensuring that during the switching process, the flow of the hydraulic cylinder is always connected to one of the lower chamber of the hydraulic cylinder or the oil return chamber, allowing a small amount of flow to pass, avoiding the occurrence of pressure peaks, thereby preventing the valve core from generating a greater impact force; therefore, there is no need to set a buffer such as a disc spring at the valve cover as in a traditional sliding valve; the present invention makes the impact force controllable by avoiding the occurrence of pressure peaks, thereby improving the life and performance of the whole machine and reducing the failure rate.

[0070] As a preferred embodiment, the extension end of the second valve cover 4 is a hollow structure with an opening, and the outer wall of the extension end is provided with a group of third communication holes 41, and a plurality of the third communication holes 41 are evenly distributed along the circumference of the extension end and communicate with the hollow inner cavity thereof;

[0071] When the hydraulic cylinder moves upward to lift the hammer, when the cylindrical valve core 5 is located in the first working position, the first channel 14 and the inner cavity of the cylindrical valve core 5 are connected through the first connecting hole 51 group; the return oil channel 16 and the inner cavity of the cylindrical valve core 5 are connected through the second connecting hole 52 group; the fourth channel 18 and the inner cavity of the cylindrical valve core 5 are connected through the third through hole group; the hydraulic oil enters the central flow channel from the second channel 15 and the third channel 17, and the hydraulic oil in the central flow channel flows out from the central flow channel to the return oil channel 16, and flows back to the return oil tank through the return channel. In this process, the hydraulic oil in the upper cavity of the hydraulic cylinder can quickly return to the return oil tank, the oil return is rapid, and the pressure in the upper cavity of the hydraulic cylinder is rapidly reduced, which can effectively increase the frequency of piling;

[0072] When the hydraulic cylinder descends and the hammer is dropped, when the cylindrical valve core 5 is located in the second working position, the cylindrical valve core 5 moves toward one end of the first valve cover 3 to a position where the second channel 15 and the third channel 17 are both connected to the valve core mounting hole 12; the second channel 15 and the inner cavity of the cylindrical valve core 5 are connected through the second connecting hole 52 group; the third channel 17 and the inner cavity of the cylindrical valve core 5 are directly connected; the first channel 14, the second channel 15, the third channel 17, and the fourth channel 18 are all connected to the central flow channel, and the hydraulic oil enters the central flow channel from the second channel 15 and the third channel 17, and flows out from the central flow channel to the first channel 14 and the fourth channel 18, thereby entering the upper chamber of the hydraulic cylinder; in this process, the upper and lower chambers of the hydraulic cylinder can be differentially connected with a large flow rate, and the pressure difference between the upper and lower chambers of the hydraulic cylinder is small. Under the action of the gravity of the hammer core, the hydraulic hammer falls quickly and the hammering is powerful;

[0073] See also Figure 4 In the process of switching between the two working positions, when the second channel 15 and the third channel 17 are blocked, the high-pressure oil in the first channel 14 and the fourth channel 18 is partially connected to the oil return channel 16 through the intercepting hole 53 on the second connecting hole 52; the hydraulic oil enters the first channel 14 and the fourth channel 18 from the central flow channel and enters the upper chamber of the hydraulic cylinder. In this process, since the second channel 15 and the third channel 17 are blocked, if the oil cannot be returned to the oil return channel 16, the pressure of the pressure oil in the second channel 15 and the third channel 17 continues to push the hydraulic cylinder to move, causing the liquid in the first flow channel to The pressurized volume is compressed, thereby generating a large pressure peak; the setting of the intercepting groove enables the tubular valve core 5 to be connected with the oil return channel 16 during the switching process between the two working positions, and the connecting connection is variable, so that a small part of the pressure oil in the central flow channel can return to the oil tank; avoiding the occurrence of pressure peaks, thereby preventing the valve core from generating a greater impact force; thus, there is no need to set a disc spring or other buffer part at the valve cover as in a traditional sliding valve; the present invention makes the impact force controllable by avoiding the occurrence of pressure peaks, thereby improving the life and performance of the entire machine and reducing the failure rate.

[0074] As a preferred embodiment, see Figure 4 and Figure 5 A first convex ring 24 is provided on the outer wall of the second pipe sleeve 22, and the first convex ring 24 is sealed and connected to the mounting hole 11 of the valve sleeve 2; and the cavity between the second pipe sleeve 22 and the mounting hole 11 of the valve sleeve 2 is divided into a first chamber c and a second chamber d; a third sealing component is provided between the first convex ring 24 and the inner wall of the mounting hole 11 of the valve sleeve 2;

[0075] A first pilot control chamber a for communicating with a pilot high-pressure oil circuit is provided at the junction of the second pipe sleeve 22 and the first pipe sleeve 21, the first pilot control chamber a is communicated with the first chamber c, and the second chamber d constitutes a second pilot control chamber b for communicating with the pilot high-pressure oil circuit; correspondingly, a first pilot oil passage communicating with the first pilot control chamber a and a second pilot oil passage communicating with the second pilot control chamber b are provided on the side wall of the main valve body 1; a second convex ring 54 movable between the axial position where the first pilot control chamber a is located and the axial position where the second pilot control chamber b is located is provided on the outer wall of the cylindrical valve core 5;

[0076] The second convex ring 54 faces one side of the first valve cover 3, and the inner side wall of the second pipe sleeve 22 and the outer side wall of the cylindrical valve core 5 enclose a second pressure chamber fe; the second pressure chamber fe is communicated with the first pilot control chamber a;

[0077] The second convex ring 54 faces the side of the second valve cover 4, and the inner wall of the second pipe sleeve 22 and the outer wall of the cylindrical valve core 5 are arranged to form a second pressure chamber; the second pressure chamber is connected to the second pilot control chamber b;

[0078] When the first pilot control chamber a is connected to the pilot high-pressure oil circuit, the cylindrical valve core 5 moves to the first working position; in actual use, when the first pilot control chamber a is connected to the pilot high-pressure oil circuit, the pressure of the hydraulic oil in the second pressure chamber fe increases, pushing the cylindrical valve core 5 to move toward the second valve cover 4 to the first working position. Figure 1As shown, at this time, the hydraulic cylinder is moving upward and is in the state of lifting the hammer. The first channel 14 is connected to the inner cavity of the cylindrical valve core 5 through the first connecting hole group 51; the return oil channel 16 is connected to the inner cavity of the cylindrical valve core 5 through the second connecting hole group 52; the fourth channel 18 is connected to the inner cavity of the cylindrical valve core 5 through the third through hole group; the hydraulic oil enters the central flow channel from the second channel 15 and the third channel 17, and the hydraulic oil in the central flow channel flows out from the central flow channel to the return oil channel 16, and flows back to the return oil tank through the reflux channel. The second channel 15 and the third channel 17 are in a closed state, without leakage and high-pressure oil flow loss. In this process, the hydraulic oil in the upper chamber of the hydraulic cylinder can quickly return to the return oil tank, the oil return is rapid, and the pressure in the upper chamber of the hydraulic cylinder is rapidly reduced, which can effectively increase the frequency of piling;

[0079] When the second pilot control chamber b is connected to the pilot high-pressure oil circuit, the cylindrical valve core 5 moves to the second working position. In actual use, when the second pilot control chamber b is connected to the pilot high-pressure oil circuit, the pressure of the hydraulic oil in the second pressure chamber increases, pushing the cylindrical valve core 5 to move toward the direction close to the first valve cover 3 to the second working position. Figure 2 As shown, at this time, the hydraulic cylinder moves downward and is in a hammer-dropping state, and the first channel 14, the second channel 15, the third channel 17, and the fourth channel 18 are all connected to the central flow channel. The hydraulic oil enters the central flow channel from the second channel 15 and the third channel 17, and flows out from the central flow channel to the first channel 14 and the fourth channel 18, thereby entering the upper chamber of the hydraulic cylinder; in this process, the upper and lower chambers of the hydraulic cylinder can be differentially connected with a large flow rate, and the pressure difference between the upper and lower chambers of the hydraulic cylinder is small. Under the action of the gravity of the hammer core, the hydraulic hammer falls rapidly and hammers forcefully.

[0080] Example 2

[0081] The present invention also provides a mechanical device, including a sliding valve device as described in Example 1. In this embodiment, the mechanical device takes a pile driver as an example. Specifically, the pile driver includes a hydraulic piling system equipped with the sliding valve device. The structures of the pile driver and other parts of the hydraulic piling system please refer to the prior art and will not be repeated here.

[0082] During the actual piling process, the pile driver provided by this embodiment can effectively reduce the impact force during the switching process and reduce the damage to the hydraulic components on the basis of improving the hammering efficiency, thereby increasing the life of the hydraulic piling system and further increasing the life of the pile driver.

[0083] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sliding valve device, characterized in that: It includes a main valve body, a valve sleeve, a first valve cover, a second valve cover, and a cylindrical valve core; The main valve body is provided with a valve sleeve mounting hole for mounting the valve sleeve and a valve core mounting hole for mounting the tubular valve core in sequence along its length; the tubular valve core slides along its axis between a first working position and a second working position in the valve core mounting hole; The valve sleeve comprises a first sleeve and a second sleeve integrally connected with the first sleeve, the valve sleeve is sealed and inserted into the inner cavity of one end of the main valve body, the second sleeve is arranged in the valve sleeve installation hole and is located between the main valve body and the cylindrical valve core; A positioning groove is provided on one end surface of the main valve body, and one end of the first pipe sleeve is matched with the positioning groove; The inner cavity at the other end of the first sleeve is provided with a positioning platform, and the first valve cover extends to the positioning platform and is sealed and connected to the other end of the first sleeve; The second valve cover extends into the inner cavity of the other end of the main valve body and is sealed and connected to the main valve body.

2. A sliding valve device according to claim 1, characterized in that: The main valve body is provided with a first channel, a second channel, an oil return channel, a third channel and a fourth channel in sequence from the first valve cover to the second valve cover. The first channel and the fourth channel are used to communicate with the upper chamber of the hydraulic cylinder, the second channel and the third channel are used to communicate with the lower chamber of the hydraulic cylinder, and the oil return channel is used to communicate with the oil return tank. The second passage and the oil return passage are separated by a first step; The cylindrical valve core is provided with a first communication hole group and a second communication hole group in sequence from the first valve cover to the second valve cover; the first communication hole group includes a plurality of first communication holes, The second communication hole group includes a plurality of second communication holes, the second communication holes include a hole body and a cut-off hole extending toward the second valve cover end, the cut-off hole is integrally connected with the hole body, and the width and length of the cut-off hole are both smaller than the width and length of the hole body; the plurality of first communication holes and the plurality of second communication holes are evenly distributed along the circumference of the cylindrical valve core and are connected with the hollow inner cavity thereof; The width of the oil return passage is greater than the width of the second communicating hole, and the width of the first step is greater than the width of the second communicating hole.

3. A sliding valve device according to claim 2, characterized in that: The extension end of the second valve cover is a hollow structure with an opening, and the outer wall of the extension end is provided with a third communication hole group, and a plurality of the third communication holes are evenly distributed along the circumference of the extension end and communicated with the hollow inner cavity thereof; When the cylindrical valve core is located at the first working position, the first channel is connected to the inner cavity of the cylindrical valve core through the first connecting hole group; the oil return channel is connected to the inner cavity of the cylindrical valve core through the second connecting hole group; the fourth channel is connected to the inner cavity of the cylindrical valve core through the third connecting hole group; When the cylindrical valve core is located at the second working position, the cylindrical valve core moves toward one end of the first valve cover to a position where the second channel and the third channel are both connected to the valve core mounting hole; the second channel and the inner cavity of the cylindrical valve core are connected through the second connecting hole group; the third channel and the inner cavity of the cylindrical valve core are directly connected; During the switching process between the two working positions, when the second channel and the third channel are blocked, the high-pressure oil in the first channel and the fourth channel is partially connected to the oil return channel through the intercepting hole on the second connecting hole.

4. A sliding valve device according to any one of claims 1 to 3, characterized in that: A first convex ring is provided on the outer wall of the second pipe sleeve, and the first convex ring is sealed and connected to the valve sleeve mounting hole; and the cavity between the second pipe sleeve and the valve sleeve mounting hole is divided into a first chamber and a second chamber; A first pilot control chamber for communicating with a pilot high-pressure oil circuit is provided at the junction of the second pipe sleeve and the first pipe sleeve, the first pilot control chamber is communicated with the first chamber, and the second chamber constitutes a second pilot control chamber for communicating with the pilot high-pressure oil circuit; When the first pilot control chamber is connected to the pilot high-pressure oil circuit, the cylindrical valve core moves to the first working position; When the second pilot control chamber is connected to the pilot high-pressure oil circuit, the cylindrical valve core moves to the second working position.

5. A sliding valve device according to claim 4, characterized in that: The outer wall of the cylindrical valve core is provided with a second convex ring which can move between the axial position where the first pilot control cavity is located and the axial position where the second pilot control cavity is located; The second convex ring faces one side of the first valve cover, and the inner side wall of the second pipe sleeve and the outer side wall of the cylindrical valve core are arranged to form a first pressure chamber; the first pressure chamber is communicated with the first pilot control chamber; The second convex ring faces the side of the second valve cover, and the inner side wall of the second pipe sleeve and the outer side wall of the cylindrical valve core are arranged to form a second pressure chamber; the second pressure chamber is communicated with the second pilot control chamber.

6. A sliding valve device according to claim 4, characterized in that: A first pilot oil passage communicating with the first pilot control chamber and a second pilot oil passage communicating with the second pilot control chamber are provided on the side wall of the main valve body.

7. A sliding valve device according to any one of claims 1 to 3, characterized in that: A first sealing assembly is provided between the first valve cover and the end surface of the other end of the first pipe sleeve; A second sealing assembly is provided between one end of the first sleeve and the bottom of the positioning groove; A fourth sealing assembly is provided between the second valve cover and an end surface of the other end of the main valve body.

8. A sliding valve device according to claim 4, wherein a third sealing component is provided between the first convex ring and the inner wall of the valve sleeve mounting hole.

9. A mechanical device, comprising a sliding valve device according to any one of claims 1 to 8.

Images