CN216951062U - Plug-in type combination valve applied to offshore operation pile hammer oil supply circuit - Google Patents

Abstract

The utility model relates to a cartridge type combination valve applied to an oil supply path of a pile hammer in offshore operation, which consists of a pilot stage cartridge valve and a main stage cartridge valve, wherein the pilot stage cartridge valve is connected with the main stage cartridge valve and used for controlling the control port pressure of the main stage cartridge valve, the pilot stage cartridge valve consists of an electromagnetic directional valve and a cartridge valve, and the electromagnetic directional valve controls and connects the cartridge valve and is used for realizing flexible control and quick response of the cartridge valve. The combined cartridge valve special for high pressure resistance, high flow, quick response and impact resistance is applied to the offshore pile driving hammer.

Description

Plug-in type combination valve applied to offshore operation pile hammer oil supply circuit

Technical Field

The utility model relates to an oil inlet combination valve applied to a marine operation pile hammer, in particular to a plug-in mounting type combination valve.

Background

With the gradual decrease of natural resources, the effective exploitation and utilization of marine resources are more and more emphasized, and the occurrence of the marine pile driving hammer solves the main problem of marine installation operation.

Be applied to marine operation pile hammer's control valve at present to ordinary cartridge valve is many, and to ordinary cartridge valve, its main shortcoming has: 1. the maximum flow is limited, and due to the structural design of the cartridge valve, the overall dimension of the cartridge valve is always smaller, so that the size of a valve port and the size of a flow passage are directly influenced, and the flow is directly limited. 2. The control precision of the common cartridge valve is relatively low, and the linearity is good only in a certain opening range. 3. The function is single, mainly used realizes the break-make of oil circuit. In view of the above disadvantages, a high integration cartridge valve is introduced in the patent of a torque motor direct control type cartridge two-dimensional electro-hydraulic proportional directional valve (CN110131229B), in which a valve core can move in two degrees of freedom, thereby realizing multi-dimensional on-off; a two-dimensional pilot-operated type electromagnetic cartridge valve (CN111457127A) patent introduces a two-stage cartridge valve, wherein a pilot stage is a micro electromagnetic switch valve, a power stage is a cartridge valve, and the two-stage pilot-operated type electromagnetic cartridge valve has the advantages of low power consumption, quick response and the like, but has the defects of low pressure and small flow; a special high-quality plug-in combined valve (a main valve and a pilot valve) matched with a loop-shaped valve bank of a hydraulic system is a core hydraulic element of offshore hydraulic pile hammer equipment, and has the characteristics of high pressure resistance, high flow rate, quick response, impact resistance and the like. The quick response, shock resistance and liquid resistance control mechanism of the special cartridge combined valve (main valve and pilot valve) need to be studied in depth.

In summary, the cartridge valve has the advantages of simple structure, small mass, large direct-pushing driving force and the like, and has a wide application prospect, but in terms of the current development situation, a special combined cartridge valve with high pressure resistance, large flow rate, quick response and impact resistance is lacked for the marine operation pile hammer, most of the current cartridge valves have small flow rate, are not suitable for high pressure, have slow response and cannot meet the requirement of the marine operation pile hammer, so that the special combined cartridge valve with high pressure resistance, large flow rate, quick response and impact resistance is urgently needed to be applied to the marine pile hammer.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides the plug-in type combination valve applied to the oil supply way of the piling hammer in offshore operation.

In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides a be applied to cartridge formula combination valve of marine operation pile hammer fuel feeding way, comprises guide's level cartridge valve and main stage cartridge valve, guide's level cartridge valve connects the main stage cartridge valve for control main stage cartridge valve control port pressure, guide's level cartridge valve comprises solenoid directional valve and cartridge valve, solenoid directional valve control connection cartridge valve for realize the nimble control and the quick response of cartridge valve.

Further, the main-stage cartridge valve comprises a valve sleeve, a valve core, a spring seat, a first cover plate, a spring and a flow channel, wherein the valve sleeve is fixedly connected with the first cover plate, the valve core is installed in the valve sleeve, the spring is installed in the valve core through the spring seat, two ends of the spring are respectively connected with the valve core and the first cover plate, the flow channel is arranged in the first cover plate, a main valve control port X is formed in one end of the valve sleeve, a control port A is formed in the other end of the valve sleeve, a control port B is formed in the side face of the valve sleeve, and the control port A is communicated with the upper cavity B of the valve core through the flow channel.

Furthermore, the valve sleeve is provided with 8 circular oil inlets which are arranged along the circumference of the valve sleeve, the bottom of the valve sleeve is provided with an oil outlet in a conical surface form, the top of the valve sleeve is connected with the first cover plate in a threaded connection mode, and three sealing grooves are formed for installing sealing rings.

Furthermore, the valve core is of a semi-hollow cylindrical structure, the upper cavity is used for installing a spring and controlling oil to enter, the lower end of the valve core adopts two conical surfaces, one of the two conical surfaces is used for forming an end face to realize upward movement of the valve core, the other conical surface is used for forming conical surface sealing with the valve sleeve to isolate the oil inlet cavity and the oil outlet cavity, and the outer surface of the valve core is provided with a plurality of groups of annular grooves for sealing and reducing the moving resistance.

Furthermore, the first cover plate is used for connecting control oil into the upper cavity of the valve, controlling the opening and closing of the valve core, two vertical oil ducts are arranged inside the first cover plate to form four oil inlets, the oil is introduced into the inner cavity of the valve core and the upper plane, the oil inlet connecting port is placed at the bottom of the first cover plate and used for being connected with the valve block, and an oil discharging joint is further arranged on the side edge of the first cover plate to play a safety role.

Furthermore, the spring seat is a cylinder with a hollow lower part and is mainly used for placing a spring to prevent the spring from deflecting and dislocating, and a flow passage is arranged at the upper part of the spring seat in a punching way; the spiral direction of the spring is right-handed, the total number of turns is 16, and the rigidity is 116.3N/mm.

Further, the pilot-stage cartridge valve comprises a valve body, a valve seat, a cover plate II, an outer cover plate, a valve core II, a valve core I, a plug shaft, a valve sleeve and a flow channel, the valve seat and the valve sleeve are arranged in the valve body, the valve core I is arranged in the valve seat, the valve core II is arranged in the valve sleeve, one end of the valve core II is connected with the cover plate II and the outer cover plate through the plug shaft, the valve body is provided with a P1 port, a P2 port, an A1 port, an A2 port and an A3 port of the cartridge valve, a T2 port, a D1 port, a D2 port and a D3 port of the electromagnetic directional valve, and the valve body is provided with the flow channel L1, the L4 and the flow channel L5.

Furthermore, the valve body is of a hollow stepped cylindrical structure, the lower half portion of the valve body is used for installing an electromagnetic directional valve and is provided with a communicating oil passage for introducing hydraulic oil of a port P into a port D3, hydraulic oil of a port D2 is introduced into the bottom of the main valve core and is used for controlling the opening and closing of the main valve core, the hydraulic oil of the port D1 is introduced back into a port T2, the upper half portion of the valve body is provided with the port P, the port T, a1, a2 and a flow passage of the port A2, and the opening and closing of the cartridge valve are achieved through the up-and-down movement of the valve core I in the valve sleeve.

Furthermore, the first valve core is of a cylindrical structure, and control oil of the electromagnetic directional valve flows to the lower end face of the first valve core through an internal oil duct, so that the first valve core moves up and down; the second valve core is a cylinder with an irregular groove, the lower end of the second valve core is connected with the first valve core, the middle of the second valve core is provided with two circular grooves for connecting the port P and the port A, and the top of the second valve core is also provided with a groove for connecting the port T and the port A.

Furthermore, the outer cover plate is used for fixing the second valve element, a threaded hole is formed in the top of the outer cover plate, and the outer cover plate is connected with the second cover plate through a bolt.

Furthermore, the valve seat is of a cylindrical structure, four channels are arranged inside the valve seat, two of the four channels are used for introducing oil to the first valve core, the other two channels are used for connecting the T port and discharging oil to the outside, and in addition, the valve seat and the first valve core form clearance fit; the upper end of the plug shaft is connected with the outer cover plate, and the lower end of the plug shaft is connected with the second valve core and used for a guide groove for moving the second valve core.

Compared with the prior art, the utility model has the following beneficial effects:

1. the application of the heat treatment technology and the reasonable selection of the materials of the main valve sleeve and the valve body optimize the structure of the valve core and the valve sleeve, and prolong the service life and improve the impact resistance of the valve group.

2. The pilot valve liquid resistance bridge circuit is optimally designed, the configuration of the pilot valve liquid resistance bridge circuit is optimized through motion simulation calculation, a quick response liquid bridge selection group is formed, the response capability of a pilot stage is improved, the dynamic characteristic of a main valve is optimized, and a foundation is laid for the control of a transition region window of a quick switching loop.

3. The valve group with strong adaptability is obtained by performing stress simulation analysis on the combination valve by using ANSYS, performing multi-condition stress analysis through interaction, optimizing the valve core and valve sleeve structure, performing flow field simulation analysis by using Fluent interaction, improving the structure, reducing cavitation erosion, and optimizing the position with overlarge stress and overlarge loss.

Drawings

FIG. 1 is a schematic cross-sectional view of a main valve of the two-stage fuel inlet combination cartridge valve of the present invention;

FIG. 2 is a schematic cross-sectional view of a two-stage oil intake combination cartridge valve pilot valve of the present invention;

FIG. 3 is a hydraulic schematic diagram of the two-stage oil intake combination cartridge valve of the present invention;

FIG. 4 is a simulation model diagram of the AMESIM two-stage oil inlet combination cartridge valve of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described in detail with reference to the accompanying drawings and detailed description below:

as shown in fig. 1 to 3, the combined cartridge valve of the pilot valve and the oil inlet valve of the marine pile driving hammer comprises a pilot stage cartridge valve D and a main stage cartridge valve P. The pilot-stage cartridge valve D is connected with the main-stage cartridge valve P and used for controlling the pressure of a control port of the cartridge valve PR, the pilot-stage cartridge valve D is composed of an electromagnetic directional valve and a cartridge valve, and the cartridge valve is controlled through the electromagnetic directional valve, so that flexible control and quick response of the cartridge valve are achieved.

As shown in figure 1, the main-stage cartridge valve comprises a valve sleeve 1, a valve core 2, a spring seat 3, a cover plate I4, a spring 5 and a flow channel, wherein the valve sleeve 1 is fixedly connected with the cover plate I4, the valve core 2 is installed in the valve sleeve 1, the spring 5 is installed in the valve core 2 through the spring seat 3, and two ends of the spring 5 are respectively connected with the valve core 2 and the cover plate I4. A flow channel is arranged in the cover plate I4, a main valve control port X is arranged at one end of the valve sleeve 1, a control port A is arranged at the other end of the valve sleeve, a control port B is arranged on the side face of the valve sleeve, and the control port A is communicated with the valve core upper cavity B through the flow channel.

Preferably, the valve housing 1 is provided with 8 circular oil inlets arranged along the circumference of the valve housing, the bottom is provided with an oil outlet in the form of a conical surface, and the top is connected with the end cover in the form of threaded connection. Three seal grooves are provided for mounting seal rings.

Preferably, the valve core 2 is mainly of a semi-hollow cylindrical structure, the upper cavity is mainly used for installing the spring 5 and controlling the entering of oil, the lower end of the upper cavity adopts two conical surfaces, one of the two conical surfaces is used for forming an end face to realize the upward moving of the valve core 2, the other conical surface is used for forming conical surface sealing with the valve sleeve 1 to isolate the oil inlet cavity and the oil outlet cavity, and a plurality of groups of annular grooves are formed in the outer surface of the upper cavity, so that the sealing effect can be achieved, and the moving resistance can be reduced.

Preferably, apron one 4 mainly used is with control oil access valve epicoele, control the opening and close of case 2, and inside sets up two vertically oil ducts, forms four oil inlets, introduces case 2 inner chamber and last plane with oil simultaneously, and the oil feed connector is put in the apron bottom for connect the valve piece, still sets up the oil extraction joint at the side, plays the safety.

Preferably, the spring seat 3 is a cylinder with a hollow lower part and is mainly used for placing the spring 5 to prevent the spring 5 from deflecting and dislocating, and the upper part is perforated to form a flow passage to better enable oil to flow into the valve core.

Preferably, the rotation direction of the spring 5 is right-handed, the total turns are 16, and the rigidity is 116.3N/mm.

As shown in fig. 2, the pilot stage cartridge valve is composed of a solenoid directional valve and a cartridge valve. The valve mainly comprises a valve body 11, a valve seat 12, a second cover plate 13, an outer cover plate 14, a second valve core 15, a first valve core 16, a plug shaft 17, a valve sleeve 18 and a flow channel. The valve body 11 is internally provided with a valve seat 12 and a valve sleeve 18, the valve seat 12 is internally provided with a first valve core 16, the valve sleeve 18 is internally provided with a second valve core 15, and one end of the second valve core 15 is connected with a second cover plate 13 and an outer cover plate 14 through a plug shaft 17. The valve body 11 is provided with a P1 port, a P2 port, an A1 port, an A2 port, an A3 port, a T2 port of the cartridge valve, a D1 port, a D2 port and a D3 port of the electromagnetic directional valve, and is provided with flow passages L1, L4 and L5. The high-pressure oil at the port P is introduced into the electromagnetic directional valve through the flow passage arranged on the valve body 11, and the oil flowing out of the electromagnetic directional valve is introduced into the bottom of the pilot valve core through the flow passage of the valve sleeve 18, so that the pilot valve core is controlled to be opened.

Preferably, the valve body 11 is a stepped cylinder structure with a hollow interior, the lower half part is used for installing the electromagnetic directional valve, and is provided with a communicating oil passage, hydraulic oil of the port P is introduced into the port D3, hydraulic oil of the port D2 is introduced into the bottom of the main valve core, the opening and closing of the main valve core are controlled, and hydraulic oil of the port D1 is introduced back to the port T2. The upper half part is provided with a port P, a port T, a port A1, a port A2 and a flow passage thereof. The opening and closing of the cartridge valve are realized by the up-and-down movement of the main valve core in the valve sleeve.

Preferably, the first valve element 16 has a cylindrical structure, and control oil of the solenoid directional valve flows to a lower end surface of the first valve element 16 through an internal oil passage, thereby achieving the up-and-down movement of the first valve element 16.

Preferably, the second valve core 15 is a cylinder with an irregular groove, the lower end of the cylinder is connected with the first valve core 16, the middle part of the cylinder is provided with two circular grooves for connecting the port P and the port A, and the top of the cylinder is also provided with a groove for connecting the port T and the port A.

Preferably, the outer cover plate 14 is only used for fixing the second valve core 15, and a threaded hole is formed in the top of the outer cover plate and connected with the second cover plate 13 through a bolt.

Preferably, the valve seat 12 is also a cylindrical structure, and four channels are provided inside, two of the channels are used for leading oil to the first valve core 16, the other two channels are used for connecting the T port and discharging oil to the outside, and in addition, the valve seat 12 and the first valve core form clearance fit.

Preferably, the plug shaft 17 is connected to the outer cover plate 14 at the upper end thereof and connected to the second valve element 15 at the lower end thereof, for use as a guide groove for movement of the second valve element 15.

As shown in fig. 3, a schematic diagram of a two-stage oil inlet cartridge valve applied to a marine pile hammer, high-pressure oil simultaneously enters a port B of a main valve and a port P1 of a pilot valve, when an electromagnetic directional valve is powered off, the high-pressure oil is in a right position and cannot pass through the directional valve, the high-pressure oil passes through the left end of the pilot valve of a damping hole, a right-end oil return tank, the pilot valve is in a left position, oil at a control port of the main valve returns to an oil tank through the pilot valve, so that the pressure at the port B jacks up the main valve core, the port B is communicated with the port a, and the high-pressure oil enters the pile hammer through the main valve. When the electromagnetic change valve is powered on, the valve is moved to the left position, the D3 port is communicated with the D2 port, the pressure at the right end of the valve core of the pilot valve is higher than that at the left end due to the adjustable throttling port, the P2 port is moved to the right position to be communicated with the A3 port, the control cavity of the main valve enters high-pressure oil, the valve core cannot move upwards due to the small area of the B cavity of the main valve, and the A port and the B port are in a disconnected state.

As shown in fig. 4, for the simulation diagram of the special combination valve for oil intake, different response characteristic curves are obtained by setting the sizes of the dampers and selecting the pilot fluid resistance matching scheme, so that simulation models such as the flow field and the structure of the special combination valve are corrected. In addition, the structural characteristic analysis of the two-stage oil inlet combination valve, the flow field characteristic analysis of the special combination valve, the stress simulation calculation analysis and the key part structure optimization are carried out, the multi-condition stress analysis is carried out interactively, the valve core and valve sleeve structure is optimized, a stress distribution diagram is obtained by designing and combining different throttling port shapes and numbers, and the optimal scheme is selected to carry out the structural optimization of key parts such as the valve core, the valve sleeve and the like. The flow field mainly comprises simulation and optimization of the valve port flow field, simulation calculation of typical working conditions and structural optimization of key parts. Flow field simulation analysis is carried out by using FLUENT software to obtain the flow characteristic and the steady-state hydrodynamic force of the valve port, and the flow field simulation analysis is carried out alternately, so that the cavitation phenomenon is reduced by improving the structure, and reference is provided for the structural design. Through liquid resistance matching, structural analysis and flow field analysis, the response of the special combination valve for oil inlet is further improved, and the pressure loss is further reduced.

The working process of the utility model is as follows:

(1) oil inlet process of special combination valve for oil inlet

The high-pressure oil simultaneously enters the port B of the main valve and the port P1 of the pilot valve, the electromagnetic valve is in the right position when being powered off, the high-pressure oil entering the pilot valve cannot pass through the reversing valve, the valve core of the pilot valve does not move at the moment, the oil liquid at the control port X of the main valve passes through the port A3 and then passes through the pilot valve flow passage L1 to the port T2, and therefore the oil returns to the oil tank. Because the pressure of the main valve control port is backpressure pressure which is far lower than oil inlet pressure, the pressure of the port B jacks the main valve core to move upwards, the port B is communicated with the port A, and high-pressure oil enters the pile driving hammer through the main valve.

(2) Oil cut-off process of special combination valve for oil inlet

The oil liquid is divided into two paths after passing through a P1 port of the pilot valve, one path of the oil liquid is acted on a main valve core of the pilot valve, the other path of the oil liquid reaches a D3 port of an electromagnetic reversing valve for the pilot valve through a flow channel L2, the electromagnetic reversing valve is electrified at the moment, the oil liquid is acted on the bottom of the valve core of the pilot valve through a D2 port of the electromagnetic reversing valve and a flow channel L4 to push the second valve core to move upwards so as to drive the first valve core to move, the oil liquid of the main flow channel of the real pilot valve reaches an A1 port through the valve sleeve and the valve core and reaches a control port X of the main valve through the flow channel L5 of the main valve to cause the pressure of an upper cavity of the main valve to rise and be close to the pressure of a port B, and the area of the B cavity of the main valve is smaller, so that the valve core can not move upwards, and the A port and the B port are in a disconnected state.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.

Claims (10)

1. The utility model provides a be applied to cartridge formula combination valve of marine operation pile hammer fuel feed line which characterized in that: the pilot-stage cartridge valve is connected with the main-stage cartridge valve and used for controlling the control port pressure of the main-stage cartridge valve, the pilot-stage cartridge valve is composed of an electromagnetic directional valve and a cartridge valve, and the electromagnetic directional valve controls the connection cartridge valve and is used for realizing flexible control and quick response of the cartridge valve.

2. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in claim 1, is characterized in that: the main-stage cartridge valve is composed of a valve sleeve, a valve core, a spring seat, a first cover plate, a spring and a flow channel, wherein the valve sleeve is fixedly connected with the first cover plate, the valve core is installed in the valve sleeve, the spring is installed in the valve core through the spring seat, two ends of the spring are respectively connected with the valve core and the first cover plate, the flow channel is arranged in the first cover plate, one end of the valve sleeve is provided with a main valve control port X, the other end of the valve sleeve is provided with a control port A, the side face of the valve sleeve is provided with a control port B, and the control port A is communicated with the upper cavity B of the valve core through the flow channel.

3. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in the claim 2 is characterized in that: the valve sleeve is provided with 8 circular oil inlets which are arranged along the circumference of the valve sleeve, the bottom of the valve sleeve is provided with an oil outlet in a conical surface form, the top of the valve sleeve is connected with a first cover plate in a threaded connection mode, and three sealing grooves are formed for installing sealing rings.

4. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in the claim 2 is characterized in that: the valve core is of a semi-hollow cylindrical structure, the upper cavity is used for installing a spring and controlling oil to enter, the lower end of the valve core adopts two conical surfaces, one of the two conical surfaces is used for forming an end face to realize upward movement of the valve core, the other conical surface is used for forming conical surface sealing with the valve sleeve to isolate the oil inlet cavity and the oil outlet cavity, and the outer surface of the valve core is provided with a plurality of groups of annular grooves for sealing and reducing the moving resistance.

5. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in the claim 2 is characterized in that: the first cover plate is used for connecting control oil into the upper cavity of the valve to control the opening and closing of the valve core, two vertical oil channels are arranged inside the first cover plate to form four oil inlets, the oil is introduced into the inner cavity of the valve core and the upper plane, the oil inlet connecting port is placed at the bottom of the first cover plate and used for being connected with the valve block, and the oil discharging connector is further arranged on the side edge of the first cover plate to play a safety role.

6. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in the claim 2 is characterized in that: the spring seat is a cylinder with a hollow lower part and is mainly used for placing a spring to prevent the spring from deflecting and dislocating, and a flow passage is arranged at the upper part of the spring seat in a punching way; the spiral direction of the spring is right-handed, the total number of turns is 16, and the rigidity is 116.3N/mm.

7. The cartridge type combination valve applied to the oil supply circuit of the offshore operation pile driving hammer in claim 1 is characterized in that: the pilot-stage cartridge valve comprises a valve body, a valve seat, a cover plate II, an outer cover plate, a valve core II, a valve core I, a plug shaft, a valve sleeve and a flow channel, wherein the valve seat and the valve sleeve are arranged in the valve body, the valve core I is arranged in the valve seat, the valve core II is arranged in the valve sleeve, one end of the valve core II is connected with the cover plate II and the outer cover plate through the plug shaft, the valve body is provided with a P1 port, a P2 port, an A1 port, an A2 port, an A3 port, a T2 port, a D1 port, a D2 port and a D3 port of the cartridge valve, and the valve body is provided with the flow channels L1, L4 and L5.

8. The cartridge type combination valve applied to the oil supply circuit of the offshore operation pile driving hammer in claim 7 is characterized in that: the valve body is of a hollow stepped cylindrical structure, the lower half portion of the valve body is used for installing an electromagnetic reversing valve, a communicating oil duct is arranged and used for introducing hydraulic oil of a P port into a D3 port, hydraulic oil of a D2 port is introduced into the bottom of the main valve core and used for controlling the opening and closing of the main valve core, the hydraulic oil of a D1 port is introduced back into a T2 port, the upper half portion of the valve body is provided with the P port, the T port, an A1 port, an A2 port and a flow passage of the A2 port, and the opening and the closing of the cartridge valve are achieved through the up-and-down movement of the first valve core in the valve sleeve.

9. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in claim 7 is characterized in that: the first valve core is of a cylindrical structure, and control oil of the electromagnetic directional valve flows to the lower end face of the first valve core through an internal oil duct, so that the first valve core moves up and down; the second valve core is an irregular cylindrical body with a groove, the lower end of the second valve core is connected with the first valve core, the middle part of the second valve core is provided with two circular grooves for connecting the port P and the port A, and the top of the second valve core is also provided with a groove for connecting the port T and the port A; the outer cover plate is used for fixing the second valve element, and the top of the outer cover plate is provided with a threaded hole which is connected with the second cover plate through a bolt.

10. The cartridge type combination valve applied to the oil supply path of the marine pile driving hammer in claim 7 is characterized in that: the valve seat is of a cylindrical structure, four channels are arranged in the valve seat, two channels are used for introducing oil to the first valve core, the other two channels are used for connecting the T port and discharging oil to the outside, and in addition, the valve seat and the first valve core form clearance fit; the upper end of the plug shaft is connected with the outer cover plate, and the lower end of the plug shaft is connected with the second valve core and used for a guide groove for moving the second valve core.

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