A combined multi-way reversing valve for drilling rig

Abstract

The utility model discloses a combined multi-way reversing valve for a drilling rig, which at least includes but is not limited to a main valve body, a feedback valve cover, an adjustable flow valve and a flow compensation valve; the main valve body is provided with a first cavity and a second cavity for accommodating the adjustable flow valve and the flow compensation valve, the adjustable flow valve is arranged in the first cavity, and the flow compensation valve is arranged between the feedback valve cover and the second cavity; the main valve body is also provided with an oil inlet cavity, an oil outlet cavity and an oil return cavity; the oil inlet cavity is arranged between the adjustable flow valve and the flow compensation valve, and the two are connected; the oil outlet cavity is connected with the adjustable flow valve through a pipeline, and the oil return cavity is connected with the front cavity of the flow compensation valve through a pipeline; the oil outlet cavity is connected with the rear cavity of the flow compensation valve through a pipeline, and an elastic component is arranged between the flow compensation valve and the feedback valve cover; the adjustable flow valve on the intermediate transition valve body of the scheme can provide a small-diameter valve sheet with a required smaller stable flow than the front valve sheet.

Description

Technical Field

[0001] The utility model relates to the field of multi-way reversing valves on a drilling rig hydraulic system, in particular to a combined multi-way reversing valve for a drilling rig. Background Art

[0002] The basic actions of the drilling rig are rotation and feeding. To ensure work efficiency, these two actions require a large flow rate to achieve high-speed rotation and fast forward and backward movement of the drill rod. Therefore, the hydraulic system requires a matching multi-way valve with a large diameter and large flow rate.

[0003] However, when the winch motor is working, a small flow rate is required. In order to meet this requirement, some systems in the prior art adopt a control method of configuring dual pumps and dual valves, which will increase the supporting cost and require a larger installation space; or the system adopts a method of adding a throttle valve outside a large-diameter valve to adjust the flow rate, and the excess oil is diverted through the high-pressure unloading of the safety valve, which will not only increase the cost, but also increase the energy consumption of the main hydraulic system and increase the system heat. Utility Model Content

[0004] The purpose of the utility model is to provide a combined multi-way reversing valve for drilling rigs to solve the above-mentioned shortcomings, which solves the problem that the small flow rate required for the work of the winch motor in the prior art is usually achieved by configuring a double pump and double valve control method, which will increase the supporting cost and require a larger installation space; or a throttle valve is added outside the large-diameter valve to adjust the flow rate, and the excess oil is diverted through the high-pressure unloading of the safety valve, which will not only increase the cost, but also increase the energy consumption of the main engine hydraulic system and increase the system heat problem.

[0005] The utility model is realized by the following scheme:

[0006] A combined multi-way reversing valve for a drilling rig, comprising an oil inlet valve body, a rotary valve body, a feed valve body, a transition valve body, a winch valve body and an oil return valve plate, characterized in that: the transition valve body includes but is not limited to a main valve body, a feedback valve cover, an adjustable flow valve and a flow compensation valve; the main valve body is provided with a first cavity and a second cavity for accommodating the adjustable flow valve and the flow compensation valve, the adjustable flow valve is arranged in the first cavity, and the flow compensation valve is arranged between the feedback valve cover and the second cavity; the main valve body is also provided with an oil inlet cavity, an oil outlet cavity and an oil return cavity; the oil inlet cavity is arranged between the adjustable flow valve and the flow compensation valve, and the two are connected; the oil outlet cavity is connected to the adjustable flow valve through a pipeline, and the oil return cavity is connected to the front cavity of the flow compensation valve through a pipeline; the oil outlet cavity is connected to the rear cavity of the flow compensation valve through a pipeline, and an elastic component is arranged between the flow compensation valve and the feedback valve cover.

[0007] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, the adjustable flow valve includes an adjusting rod, a locking nut and an adjusting seat; the first cavity includes a positioning cavity for accommodating the adjusting seat and an adjusting cavity for accommodating the adjusting rod; the adjusting seat is arranged on the positioning cavity, and the adjusting rod is sleeved in the adjusting seat, one end of which extends into the adjusting cavity and the other end protrudes from the main valve body; the locking nut is arranged on the adjusting rod, and a sealing ring is also arranged on the contact portion between the adjusting seat and the positioning cavity.

[0008] Based on the structure of the combined multi-way reversing valve for a drilling rig, a threaded cavity is arranged in the adjusting seat, and an external thread matching with the threaded cavity is arranged on the adjusting rod.

[0009] Based on the structure of the above-mentioned combined multi-way reversing valve for a drilling rig, a first vertical flow channel, a second vertical flow channel and a third vertical flow channel are horizontally spaced apart on the upper edge of the main valve body, the first vertical flow channel and the third vertical flow channel are arranged in parallel, and screw plugs are arranged on the first vertical flow channel, the second vertical flow channel and the third vertical flow channel; the flow channel is blocked by the screw plugs.

[0010] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, the third vertical flow channel is connected to the regulating chamber, the end of the regulating rod is arranged at the connection between the third vertical flow channel and the regulating chamber, and the distance X between the end face of the regulating rod and the third vertical flow channel is the opening of the entire adjustable flow valve.

[0011] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, the third vertical flow channel is connected to the oil outlet chamber, one end of the oil outlet chamber passes through the main valve body, and a screw plug is also provided at the end of the oil outlet chamber. The oil outlet chamber is connected to the rear cavity of the flow compensation valve through a thin pipeline, and a damping plug is also provided on the thin pipeline.

[0012] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, the flow compensation valve includes a flow valve core, a first feedback valve spring and a second feedback valve spring, the flow valve core is arranged in the oil inlet chamber, the first feedback spring is sleeved in the second feedback spring to form a spring group, and a limiting chamber for accommodating the spring group is arranged in the feedback valve cover, one end of the spring group is in conflict with the flow valve core, and the other end is in conflict with the end of the limiting chamber; one end of the thin pipeline is connected to the limiting chamber, and the other end is connected to the oil outlet chamber.

[0013] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, a radial hole is arranged on the flow valve core, the first vertical flow channel is connected to the reflux chamber, the reflux chamber is vertically arranged on one side of the oil inlet chamber, and when the flow valve core is pushed to the position of the reflux chamber, the oil flows into the reflux chamber through the radial hole.

[0014] Based on the structure of the above-mentioned combined multi-way reversing valve for drilling rigs, the oil inlet valve body is connected to the rotary valve body, the rotary valve body is connected to the feed valve body, the feed valve body is connected to the transition valve body, the transition valve body is connected to the winch valve body, and the winch valve body is connected to the oil return valve plate.

[0015] Based on the structure of the combined multi-way reversing valve for drilling rigs, the oil inlet and return valve body is provided with a cartridge safety valve, the rotary valve body and the feed valve body are large valve plates with a diameter of 25, and the winch valve body is a valve plate with a diameter of 20.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] 1. In this scheme, since the adjustable flow valve is arranged between the oil outlet chamber and the oil inlet chamber, the flow rate of the oil entering the oil outlet chamber can be changed by changing the depth of the adjustable flow valve. The flow rate through the transition valve body is adjustable, and a small flow rate can be output according to actual needs. By arranging an elastic component between the flow compensation valve and the feedback valve cover, a certain support can be provided for the valve body of the flow compensation valve. When the pressure of the front cavity of the flow compensation valve is greater than the supporting force of the elastic component, the elastic component is compressed, and the reflux chamber is opened at this time. Conversely, the reflux chamber is closed. In this way, not only the output flow rate of the transition valve body can be adjusted, but also the flow compensation valve can be automatically opened or closed while adjusting the flow rate to reflux excess oil, thereby reducing the unloading pressure loss of the entire system, making the system low in energy consumption and low in heat generation, and avoiding the system being in a high-pressure unloading state through the safety valve for a long time to increase energy consumption.

[0018] 2. This scheme of combined multi-way reversing valve for drilling rigs is a product developed according to the specific working conditions and operating requirements of the drilling rig, which can provide two different flow rates for the actuator of the hydraulic system. The valve is a slice structure with compact structure and complete functions. It is composed of large and small diameter valve bodies. The front two large diameter valves are used for drill pipe rotation and feeding, and the rear small diameter valve is used for winch motor. The adjustable flow valve on the intermediate transition valve body can provide the small diameter valve piece with the required stable flow smaller than the front valve piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the transition valve body in the utility model;

[0020] Figure 2 It is a schematic diagram of the position of the radial holes in the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a combined multi-way reversing valve for a drilling rig in the utility model;

[0022] Description of the drawings: 1. Main valve body; 2. Feedback valve cover; 3. Adjustable flow valve; 4. Flow compensation valve; 5. First cavity; 6. Second cavity; 7. Oil inlet cavity; 8. Oil outlet cavity; 9. Oil return cavity; 11. First vertical flow channel; 12. Second vertical flow channel; 13. Third vertical flow channel; 14. Screw plug; 15. Thin pipe; 16. Damping plug; 21. Limiting cavity; 31. Adjusting rod; 32. Locking nut; 33. Adjusting seat; 34. Positioning cavity; 35. Adjusting cavity; 36. Sealing ring; 41. Flow valve core; 42. First feedback valve spring; 43. Second feedback valve spring; 44. Radial hole; 101. Oil inlet valve body; 102. Rotary valve body; 103. Feed valve body; 104. Transition valve body; 105. Winch valve body; 106. Oil return valve plate. DETAILED DESCRIPTION

[0023] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0024] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0025] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0027] Example 1

[0028] like Figure 1-2 As shown, the utility model provides a technical solution:

[0029] A combined multi-way reversing valve for drilling rigs, comprising an oil inlet valve body 101, a rotary valve body 102, a feed valve body 103, a transition valve body 104, a winch valve body 105 and an oil return valve plate 106, wherein the transition valve body at least includes but is not limited to a main valve body 1, a feedback valve cover 2, an adjustable flow valve 3 and a flow compensation valve 4; the main valve body 1 is provided with a first cavity 5 and a second cavity 6 for accommodating the adjustable flow valve 3 and the flow compensation valve 4, the adjustable flow valve 3 is arranged in the first cavity 5, and the flow compensation valve 4 is provided in the first cavity 5. The compensation valve 4 is arranged between the feedback valve cover 2 and the second cavity 6; the main valve body 1 is also provided with an oil inlet cavity 7, an oil outlet cavity 8 and an oil return cavity 9; the oil inlet cavity 7 is arranged between the adjustable flow valve 3 and the flow compensation valve 4, and connects the two; the oil outlet cavity 8 is connected with the adjustable flow valve 3 through a pipeline, and the oil return cavity 9 is connected with the front cavity of the flow compensation valve 4 through a pipeline; the oil outlet cavity 8 is connected with the rear cavity of the flow compensation valve 4 through a pipeline, and an elastic component is arranged between the flow compensation valve 4 and the feedback valve cover 2.

[0030] Based on the above structure, since the adjustable flow valve 3 is arranged between the oil outlet chamber 8 and the oil inlet chamber 7, the oil flow rate entering the oil outlet chamber 8 can be changed by changing the depth of the adjustable flow valve 3. The flow rate through the transition valve body 104 is adjustable, and a small flow rate can be output according to actual needs. By arranging an elastic component between the flow compensation valve 4 and the feedback valve cover 2, a certain support can be provided for the valve body of the flow compensation valve 4. When the pressure of the front side cavity of the flow compensation valve 4 is greater than the supporting force of the elastic component, the elastic component is compressed, and the reflux chamber is opened at this time. Otherwise, the reflux chamber is closed. In this way, not only the output flow rate of the transition valve body 104 can be adjusted, but also the flow compensation valve 4 can be automatically opened or closed while adjusting the flow rate to reflux excess oil, thereby reducing the unloading pressure loss of the entire system, making the system low in energy consumption and low in heat generation, and avoiding the system being in a high-pressure unloading state through the safety valve for a long time and increasing energy consumption.

[0031] As an example, the adjustable flow valve 3 may include an adjusting rod 31, a locking nut 32 and an adjusting seat 33; the first cavity 5 may include a locking cavity 34 for accommodating the adjusting seat 33 and an adjusting cavity 35 for accommodating the adjusting rod 31; the adjusting seat 33 is arranged on the locking cavity 34, and the adjusting rod 31 is sleeved in the adjusting seat 33, one end of which extends into the adjusting cavity 35, and the other end protrudes from the main valve body 1; the locking nut 32 is arranged on the adjusting rod 31, and a sealing ring 36 may also be arranged on the contact part between the adjusting seat 33 and the locking cavity 34.

[0032] Based on the above structure, the adjusting rod 31 can adjust the length in the adjusting chamber 35 , thereby adjusting the flow rate from the oil inlet chamber 7 to the oil outlet chamber 8 , and the adjusting rod 31 can be locked by the locking nut 32 .

[0033] As an example, a threaded cavity may be provided in the adjustment seat 33 , and an external thread matching the threaded cavity may be provided on the adjustment rod 31 , so that the length of the adjustment rod 31 in the adjustment cavity 35 can be changed by rotation.

[0034] As an example, a first vertical flow channel 11, a second vertical flow channel 12 and a third vertical flow channel 13 are arranged at intervals along the horizontal position of the main valve body 1, wherein the first vertical flow channel 11 and the third vertical flow channel 13 are arranged in parallel, and screw plugs 14 are arranged on the first vertical flow channel 11, the second vertical flow channel 12 and the third vertical flow channel 13; the flow channel is blocked by the screw plugs 14;

[0035] The third vertical flow channel 13 is connected to the regulating chamber 35 , the end of the regulating rod 31 is arranged at the connection between the third vertical flow channel 13 and the regulating chamber 35 , and the distance X between the end face of the regulating rod 31 and the third vertical flow channel 13 is the opening of the entire adjustable throttle 3 .

[0036] Based on the above structure, by changing the distance X between the adjusting rod 31 and the third vertical flow channel 13 , the flow rate output outward by the entire transition valve body 104 can be changed, which is achieved by screwing the adjusting rod 31 in and out.

[0037] As an example, the third vertical flow channel 13 is connected to the oil outlet chamber 8, one end of the oil outlet chamber 8 passes through the main valve body 1, and a screw plug 14 is also provided at the end of the oil outlet chamber 8. The oil outlet chamber 8 is connected to the rear cavity of the flow compensation valve 4 through a thin pipeline 15. A damping plug 16 can also be provided on the thin pipeline 15, so that the oil outlet chamber 8 can be connected to the compensation flow valve, which is convenient for subsequent pressure linkage operations.

[0038] As an example, the flow compensation valve may include a flow valve core 41, a first feedback valve spring 42 and a second feedback valve spring 43, the flow valve core 41 is arranged in the oil inlet chamber 7, the first feedback spring is arranged in the second feedback spring to form a spring group, and a limiting chamber 21 for accommodating the spring group is provided in the feedback valve cover 2, one end of the spring group is in contact with the flow valve core 41, and the other end is in contact with the end of the limiting chamber 21; one end of the thin pipeline 15 is connected to the limiting chamber 21, and the other end is connected to the oil outlet chamber 8.

[0039] A radial hole 44 is provided on the flow valve core 41, and the first vertical flow channel 11 is connected to the reflux chamber, which is vertically arranged on one side of the oil inlet chamber 7. When the flow valve core 41 is pushed to the position of the reflux chamber, the oil flows into the reflux chamber through the radial hole 44.

[0040] Based on the above structure, by changing the position of the regulating valve stem in the regulating seat 33 and the axial displacement of the regulating valve stem in the transition valve plate hole, the opening X between the regulating rod 31 and the transition valve body 104 is changed. When the required flow rate is adjusted, the screw lock nut locks the position of the regulating valve stem; the oil passes through the throttle valve to the oil outlet chamber 8 and then is supplied to the outside world; the excess oil after the nominal flow rate discharged by the pump reaches the required flow rate outside will be unloaded back to the oil tank through the flow valve core 41; its working principle is: the front chambers of the adjustable flow valve 3 and the flow compensation valve 4 are connected, that is, the position of the oil inlet chamber 7, so the pressure in the front chamber of the flow compensation valve 4 is the same as that in the front chamber of the adjustable flow valve 3, and the flow valve core 4 The oil in the rear chamber 1 is the oil in the rear chamber of the adjustable flow valve 3 (where the oil outlet chamber 8 is located) and reaches the rear chamber of the flow valve core 41 after passing through the fine pipe 15 and the damping plug 16. Therefore, the pressure in the rear chamber of the flow valve core 41 is the pressure in the rear chamber of the adjustable flow valve 3. Due to the throttling effect of the adjustable flow valve 3, there is a pressure difference ΔP between the front and rear chambers of the adjustable flow valve 3. When the flow required by the outside world is large and the opening X of the adjustable flow valve 3 is large, the pressure difference between the front and rear chambers of the adjustable flow valve 3 is small. If the force generated by this pressure difference is less than the sum of the force values ​​of the two feedback valve springs in the rear chamber of the flow valve core 41, the flow valve core 41 is in a closed state at this time, and the full flow of the oil in the oil inlet chamber 7 flows to the oil outlet chamber 8 (such as Figure 1 ); When the flow rate required by the outside world is small and the throttle valve opening is small, the pressure difference between the front and rear chambers of the adjustable flow valve 3 increases. If the force generated by this pressure difference is greater than the sum of the forces of the two feedback valve springs in the rear chamber of the flow valve core 41, the flow valve core 41 moves toward the rear chamber, so that the oil inlet chamber 7 communicates with the oil return chamber 9 through a group of radial holes 44 on the flow valve core 41 (such as Figure 2 ), at this time, the excess oil after the oil discharged by the pump minus the oil required by the outside world will directly return to the oil tank. And the pressure difference value ΔP is much smaller than the pressure of directly pushing open the main safety valve to unload, so the pressure of the excess oil unloading through the flow valve core 41 is low, that is, the unloading pressure loss is small, the system energy consumption is low and the heat generation is small, avoiding the system from being in a high-pressure unloading state through the safety valve for a long time and increasing energy consumption. When the adjustable throttle valve 3 is adjusted to the flow required by the outside world, the position of the adjusting rod 31 is fixed and locked by the locking nut 32. At this time, the opening X is fixed, and the pressure difference between the front and rear chambers of the throttle valve is constant, so the flow output to the outside world is stable.

[0041] Example 2

[0042] Based on the above embodiment 1, Figure 3 As shown, the utility model provides a technical solution:

[0043] A combined multi-way reversing valve for a drilling rig, wherein an oil inlet valve body 101 is connected to a rotary valve body 102, the rotary valve body 102 is connected to a feed valve body 103, the feed valve body 103 is connected to a transition valve body 104, the transition valve body 104 is connected to a winch valve body 105, and the winch valve body 105 is connected to an oil return valve plate 106.

[0044] Based on the above structure, the rotary valve disc and the feed valve disc in this embodiment use large-diameter valve discs (25 diameter), and the oil supply directly uses the nominal flow rate (160L / min) discharged by the pump, from the oil inlet flow channel on the oil inlet valve body 1011 to the oil inlet flow channel on the rotary valve body 102 and the feed valve body 103. The corresponding position of the slide valve on the valve body channel is changed by operating the handle, so that the oil is transferred from the P chamber to the A chamber or B chamber of the working oil port to complete the forward and reverse rotation of the rotation, and the fast retreat and fast forward action of the drill pipe; the oil circuits of the two valve bodies are parallel oil circuits, which can perform compound actions. The return oil returns to the oil tank through the return oil port on the oil inlet valve body 101; the transition valve disc of the multi-way reversing valve is equipped with an adjustable flow valve 3 and a flow compensation valve 4. The adjustable flow valve 3 is composed of an adjusting rod 31, a locking nut 32, an adjusting seat 33, a sealing ring 36, etc. The flow compensation valve 4 is composed of a flow valve core 41, a first feedback valve spring 42, a second feedback valve spring 43, a damping plug 16, a sealing ring 36, a feedback valve cover 2, etc. The oil in the front chamber of the adjustable flow valve 3 is the nominal flow discharged by the pump, and the flow reaches the oil inlet chamber 7 of the transition valve body 104 after passing through the oil inlet valve plate, the rotary valve plate, and the oil inlet channel of the feed valve plate.

[0045] As an example, the oil return valve body of the multi-way reversing valve is equipped with a plug-in safety valve to protect the safety of the main engine hydraulic system.

[0046] The rotary valve body 102 of the multi-way reversing valve is a large valve plate (25 diameter), which is used for the drill pipe rotary motor. The middle position function is a Y-type function, the operation mode is manual operation, and the fixed reset mode is steel ball positioning.

[0047] The feed valve body 103 of the multi-way reversing valve is a large valve plate (25 diameter), which is used for the drill pipe feed cylinder. The middle position function is an O-type function, the operation mode is manual operation, and the fixed reset mode is spring reset.

[0048] The transition valve body 104 of the multi-way reversing valve is provided with a flow compensation valve 4 and an adjustable flow valve 3, which can convert the large flow oil output by the pump into a small flow oil for use by the small reversing valve plate at the back, thereby meeting the flow required by the actuator controlled by the small reversing valve plate, and the flow can be changed by adjusting the throttle valve opening. Once the opening is adjusted, a stable flow of the corresponding opening can be output, and the flow is not affected by load changes, that is, the actuator speed is not affected by load changes.

[0049] The winch valve body 105 of the multi-way reversing valve is a small valve plate (20 diameter), which is used for the winch motor. The middle position function is an O-type function, the operation mode is manual operation, and the fixed reset mode is spring reset.

[0050] The multi-way reversing valve winch valve body 105 adopts a small-diameter valve plate (20 diameter), and the oil supply is provided by the transition valve body 104 with a small flow of oil (60-90L / min), from the oil outlet cavity 8 on the transition valve body 104 to the oil inlet flow channel of the small-diameter winch valve body 105 (20 diameter), and the corresponding position of the slide valve on the valve body channel is changed by operating the handle, so that the oil is transferred from the P cavity to the A cavity or B cavity of the working oil port to complete the forward and reverse rotation of the winch motor. The oil circuit of this valve plate is a series-parallel oil circuit with the previous rotary valve plate and the feed valve plate. The return oil returns to the oil tank through the return oil port on the return oil valve body.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined multi-way reversing valve for a drilling rig, comprising an oil inlet valve body, a rotary valve body, a feed valve body, a transition valve body, a winch valve body and an oil return valve plate, characterized in that: The transition valve body includes but is not limited to a main valve body, a feedback valve cover, an adjustable flow valve and a flow compensation valve; the main valve body is provided with a first cavity and a second cavity for accommodating the adjustable flow valve and the flow compensation valve, the adjustable flow valve is arranged in the first cavity, and the flow compensation valve is arranged between the feedback valve cover and the second cavity; the main valve body is also provided with an oil inlet cavity, an oil outlet cavity and an oil return cavity; the oil inlet cavity is arranged between the adjustable flow valve and the flow compensation valve, and connects the two; the oil outlet cavity is connected to the adjustable flow valve through a pipeline, and the oil return cavity is connected to the front cavity of the flow compensation valve through a pipeline; the oil outlet cavity is connected to the rear cavity of the flow compensation valve through a pipeline, and an elastic component is arranged between the flow compensation valve and the feedback valve cover.

2. A combined multi-way reversing valve for drilling rigs as claimed in claim 1, characterized in that: The adjustable flow valve includes an adjusting rod, a locking nut and an adjusting seat; the first cavity includes a locking cavity for accommodating the adjusting seat and an adjusting cavity for accommodating the adjusting rod; the adjusting seat is arranged on the locking cavity, and the adjusting rod is sleeved in the adjusting seat, with one end extending into the adjusting cavity and the other end protruding from the main valve body; the locking nut is arranged on the adjusting rod, and a sealing ring is also arranged on the contact part between the adjusting seat and the locking cavity.

3. A combined multi-way reversing valve for drilling rigs as claimed in claim 2, characterized in that: The adjusting seat is provided with a threaded cavity, and the adjusting rod is provided with an external thread matching with the threaded cavity.

4. A combined multi-way reversing valve for drilling rigs as claimed in claim 3, characterized in that: The main valve body is horizontally spaced apart with a first vertical flow channel, a second vertical flow channel and a third vertical flow channel, the first vertical flow channel and the third vertical flow channel are arranged in parallel, and screw plugs are arranged on the first vertical flow channel, the second vertical flow channel and the third vertical flow channel; the flow channel is blocked by the screw plugs.

5. A combined multi-way reversing valve for drilling rigs as claimed in claim 4, characterized in that: The third vertical flow channel is connected to the regulating chamber, the end of the regulating rod is arranged at the connection between the third vertical flow channel and the regulating chamber, and the distance X between the end surface of the regulating rod and the third vertical flow channel is the opening of the entire adjustable flow valve.

6. A combined multi-way reversing valve for drilling rigs as claimed in claim 5, characterized in that: The third vertical flow channel is connected to the oil outlet chamber, one end of the oil outlet chamber passes through the main valve body, and a screw plug is also provided at the end of the oil outlet chamber. The oil outlet chamber is connected to the rear cavity of the flow compensation valve through a thin pipeline, and a damping plug is also provided on the thin pipeline.

7. A combined multi-way reversing valve for drilling rigs as claimed in claim 6, characterized in that: The flow compensation valve includes a flow valve core, a first feedback valve spring and a second feedback valve spring. The flow valve core is arranged in an oil inlet chamber. The first feedback valve spring is sleeved in the second feedback spring to form a spring group. A limiting chamber for accommodating the spring group is arranged in the feedback valve cover. One end of the spring group is in conflict with the flow valve core, and the other end is in conflict with the end of the limiting chamber. One end of the thin pipeline is connected to the limiting chamber, and the other end is connected to the oil outlet chamber.

8. A combined multi-way reversing valve for a drilling rig as claimed in claim 7, characterized in that: The flow valve core is provided with radial holes, the first vertical flow channel is connected to the reflux chamber, the reflux chamber is vertically arranged on one side of the oil inlet chamber, when the flow valve core is pushed to the position of the reflux chamber, the oil flows into the reflux chamber through the radial holes.

9. A combined multi-way reversing valve for a drilling rig as claimed in claim 8, characterized in that: The oil inlet valve body is connected to the rotary valve body, the rotary valve body is connected to the feed valve body, the feed valve body is connected to the transition valve body, the transition valve body is connected to the winch valve body, and the winch valve body is connected to the oil return valve plate.

10. A combined multi-way reversing valve for a drilling rig as claimed in claim 9, characterized in that: The oil inlet valve body is provided with a plug-in safety valve, the rotary valve body and the feed valve body are large valve plates with a diameter of 25, and the winch valve body is a valve plate with a diameter of 20.

Images