Hydraulic system for composite application of load-sensitive pump of drilling machine

Abstract

The utility model relates to a drilling machine load-sensitive pump composite application hydraulic system which comprises an oil tank, a mud pump, a left walking module, a right walking module, a load-sensitive pump, a switching valve group and a load-sensitive valve. The inlet end of the load-sensitive pump is communicated with an oil tank, the outlet end of the load-sensitive pump is respectively communicated with a slurry pump through the switching valve group, and the outlet end of the load-sensitive pump is communicated with the load-sensitive valve; the load sensitive valve is respectively communicated with the left walking module and the right walking module; the switching valve group comprises a first switching valve and a second switching valve, the first switching valve is respectively communicated with the load-sensitive pump and the slurry pump, and the second switching valve is respectively communicated with the load-sensitive pump and the load-sensitive valve. Through the same load-sensitive pump, the left walking track, the right walking track and the slurry pump are respectively driven, a group of oil pumps are saved, the component cost of the drilling machine is reduced, and the weight of the drilling machine is reduced.

Description

Technical Field

[0001] The utility model relates to a drilling rig hydraulic system, in particular to a drilling rig load-sensitive pump composite hydraulic system. Background Art

[0002] Drilling rigs are often used for drilling or exploration operations. Common drilling rigs include trenchless drilling rigs and horizontal directional drilling rigs. Drilling rigs typically consist of a crawler chassis (including left and right crawler tracks), a drill rig, a driver's cabin, a power head system, and a mud system. The crawler chassis includes left and right crawler tracks, and the mud system includes a mud pump.

[0003] The left and right crawler tracks are used to realize the movement and steering of the drilling rig. The mud pump is used to inject mud into the drill pipe or the borehole.

[0004] The left and right crawler tracks, as well as the mud pump, are all driven by the drilling rig's hydraulic system. In actual operation, due to the drilling rig's climbing and overcoming obstacles, the left and right crawler tracks require load-sensing pumps to achieve load regulation. The mud pump, on the other hand, requires a constant-pressure, constant-volume pump.

[0005] Therefore, the hydraulic system of the existing drilling rig drives the left and right walking crawlers and the mud pump using two completely independent oil pumps.

[0006] Although two independent oil pumps can respectively realize the working requirements of the left and right walking tracks and drive the mud pump, the two independent oil pumps will lead to higher component costs of the drilling rig and higher deadweight of the drilling rig. Utility Model Content

[0007] The purposes of this utility model are:

[0008] A load-sensitive pump composite hydraulic system for drilling rigs is designed. The left and right walking tracks and the mud pump are driven separately by the same load-sensitive pump, which saves a set of oil pumps, reduces the component cost of the drilling rig, and reduces the weight of the drilling rig.

[0009] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0010] A drilling rig load-sensitive pump composite hydraulic system includes an oil tank, a mud pump, a left travel module, and a right travel module, and also includes a load-sensitive pump, a switching valve group, and a load-sensitive valve; the inlet end of the load-sensitive pump is connected to the oil tank, the outlet end of the load-sensitive pump is connected to the mud pump through the switching valve group, and the outlet end of the load-sensitive pump is connected to the load-sensitive valve; the load-sensitive valve is connected to the left travel module and the right travel module respectively; the switching valve group includes a first switching valve and a second switching valve, the first switching valve is connected to the load-sensitive pump and the mud pump respectively, and the second switching valve is connected to the load-sensitive pump and the load-sensitive valve respectively.

[0011] Furthermore, the first switching valve and the second switching valve are both electromagnetic reversing valves; the outlet end of the load-sensing pump is a P port, and the P port is connected to the input ends of the first switching valve and the second switching valve respectively.

[0012] Furthermore, the load-sensing pump further has an LS port, and the output end of the second switching valve is connected to the LS port.

[0013] Furthermore, when no electrical signal is input to the first switching valve, the circuit between the load-sensing pump and the mud pump is disconnected; when no electrical signal is input to the second switching valve, the circuit between the load-sensing pump and the LS port is disconnected.

[0014] Furthermore, the switching valve group further includes a relief valve, and the relief valve is connected to the P port of the load sensing pump.

[0015] Furthermore, the switching valve group further includes a throttle valve, and the throttle valve is located between the overflow valve and the P port of the load sensing pump.

[0016] Furthermore, the first switching valve is a two-position two-way electromagnetic directional valve, and the second switching valve is a two-position three-way electromagnetic directional valve.

[0017] Furthermore, the load-sensing valve is connected in parallel with the left travel module and the right travel module respectively.

[0018] The beneficial effects of the utility model are:

[0019] A hydraulic system for the combined use of load-sensitive pumps on a drilling rig uses the same load-sensitive pump in conjunction with a switching valve group and a load-sensitive valve to achieve separate driving of the left and right walking tracks and the mud pump. The innovative oil circuit design allows the load-sensitive pump to be converted into a constant-pressure and constant-volume pump when driving the mud pump, meeting the actual use requirements of the mud pump. This saves a set of oil pumps, enables the combined use of load-sensitive pumps, reduces the component cost of the drilling rig, reduces the weight of the drilling rig, and reduces the complexity of the drilling rig's hydraulic oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the hydraulic principle of a hydraulic system for a drilling rig load-sensitive pump composite application according to the present invention.

[0021] Figure 2 This is a schematic diagram of a switching valve group of a hydraulic system for a drilling rig load-sensing pump composite application according to the present invention.

[0022] Figure 3 This is a schematic diagram of a load-sensing pump, a left travel module, and a right travel module of a hydraulic system for a drilling rig load-sensing pump composite application according to the present invention.

[0023] The accompanying drawings are:

[0024] 1. Fuel tank; 2. Load-sensing pump; 3. Switching valve group; 31. First switching valve; 32. Second switching valve; 33. Overflow valve; 34. Throttle valve; 4. Mud pump; 5. Load-sensing valve; 6. Left travel module; 7. Right travel module. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] refer to Figures 1 to 3 A drilling rig load-sensitive pump composite hydraulic system includes an oil tank 1, a mud pump 4, a left walking module 6, and a right walking module 7. The oil tank 1 is the oil tank of the drilling rig's hydraulic system, which is used to store hydraulic oil; the mud pump 4 is located on one side of the drilling rig's chassis and is used to supply mud; the left walking module 6 and the right walking module 7 are respectively located on the left and right sides of the drilling rig's chassis and are used for walking.

[0027] The hydraulic system also includes a load-sensing pump 5, a switching valve assembly 3, and a load-sensing valve 5. The load-sensing pump 5 supplies hydraulic oil from the oil tank 1, while the switching valve assembly 3 switches the hydraulic oil supply direction, thereby controlling whether hydraulic oil is supplied to the mud pump 4. The load-sensing valve 5 works in conjunction with the load-sensing pump 2 to adjust the hydraulic oil supply flow to the left travel module 6 and / or the right travel module 7 based on the actual load.

[0028] The inlet end of the load-sensing pump 2 is connected to the oil tank 1 and is used to extract hydraulic oil from the oil tank 1. The outlet end of the load-sensing pump 2 is connected to the mud pump 4 through the switching valve group 3. The outlet end of the load-sensing pump 5 is connected to the load-sensing valve 5; it is used to control the on-off supply of hydraulic oil to the mud pump 4.

[0029] The load sensing valve 5 is connected to the left walking module 6 and the right walking module 7 respectively, and is used to sense the actual load of the left walking module 6 and the right walking module 7.

[0030] The switching valve assembly 3 includes a first switching valve 31 and a second switching valve 32. The first switching valve 31 is connected to the load-sensing pump 2 and the mud pump 4, respectively, while the second switching valve 32 is connected to the load-sensing pump 2 and the load-sensing valve 5, respectively. The first switching valve 31 is used to control the flow of hydraulic oil to the mud pump 4. The second switching valve 32 is used to control the flow of hydraulic oil to the LS port of the load-sensing pump 2.

[0031] The first switching valve 31 and the second switching valve 32 are both electromagnetic reversing valves that can receive electrical signals from the drilling rig to perform switching actions; the outlet end of the load-sensing pump 2 is port P, which is respectively connected to the input ends of the first switching valve 31 and the second switching valve 32. The hydraulic oil supplied by the load-sensing pump 2 is supplied from port P.

[0032] The load-sensing pump 2 also has an LS port, which is connected to the output of the second switching valve 32. When hydraulic oil from the second switching valve 32 is supplied to the LS port, the load-sensing pump 2 becomes a constant-pressure, constant-flow pump relative to the mud pump 4. The load-sensing pump 2 is a mature product. When its LS port is open, the load-sensing pump 2 becomes a constant-pressure, constant-flow pump.

[0033] When no electric signal is input to the first switching valve 31 , the circuit between the load sensing pump 2 and the mud pump 4 is broken; at this time, oil cannot be supplied to the mud pump 4 and the mud pump 4 does not work.

[0034] When no electric signal is input to the second switching valve 32 , the circuit between the load sensing pump 2 and the LS port is disconnected, that is, no hydraulic oil is input to the LS port.

[0035] The switching valve group 3 also includes a relief valve 33, which is connected to the P port of the load sensing pump 2. The relief valve 33 is used to limit the maximum oil pressure of the hydraulic system. The maximum oil pressure can be adjusted by adjusting RV1 of the relief valve 33.

[0036] The switching valve group 3 further includes a throttle valve 34 . The throttle valve 34 is located between the overflow valve 33 and the P port of the load sensing pump 2 . The throttle valve 34 is used to perform a throttling function.

[0037] The first switching valve 31 is a two-position two-way electromagnetic directional valve, and the second switching valve 32 is a two-position three-way electromagnetic directional valve. The two-position two-way electromagnetic directional valve is an existing mature technology.

[0038] The load sensing valve 5 is connected in parallel with the left walking module 6 and the right walking module 7 respectively, and is used to sense the actual load of the left walking module 6 and the right walking module 7.

[0039] The working principle of this utility model is:

[0040] When the mud pump 4 for supplying mud is working, it indicates that the drilling rig is in operation. At this time, the drilling rig needs to be fixed in position and cannot be moved, so the left walking module 6 and the right walking module 7 on both sides of the chassis are stopped.

[0041] That is, the mud pump 4, the left travel module 6 and the right travel module 7 do not work at the same time. Based on this working scenario, a hydraulic system is designed in which the load-sensing pump 2 can be used in combination.

[0042] When the drilling rig needs to move, the SV1 of the first switching valve 31 and the SV2 of the second switching valve 32 of the switching valve group 3 are both de-energized. At this time, the hydraulic oil supplied by the load sensing pump 2 does not reach the mud pump 4, that is, the mud pump 4 stops. The hydraulic oil reaches the load sensing pump 5, the left travel module 6, and the right travel module 7.

[0043] According to the needs of the drilling rig to move forward, backward, turn left or right, the three-position six-way solenoid valve of the left walking module 6 and the right walking module 7 is controlled, and the left walking module 6 and the right walking module 7 on both sides of the chassis move synchronously or individually to realize the corresponding movement of the drilling rig.

[0044] In this state, the load sensing valve 5 cooperates with the load sensing pump 5 to adjust the hydraulic oil flow of the left walking module 6 and / or the right walking module 7 according to the actual load of the left walking module 6 and / or the right walking module 7.

[0045] When the drilling rig stops and starts drilling or exploration operations, the left travel module 6 and the right travel module 7 on both sides of the chassis stop, and the SV1 of the first switching valve 31 and the SV2 of the second switching valve 32 of the switching valve group 3 are energized; the hydraulic oil reaches the LS port of the mud pump 4 and the load sensing pump 2, and the mud pump 4 starts working to supply mud.

[0046] Since the LS port of the load sensing pump 2 is connected, the load sensing pump 2 becomes a constant pressure and constant flow pump in this state, thereby meeting the working requirements of the mud pump 4.

[0047] Thus, the composite use of a single load-sensing pump 2 is realized, which can reduce the component cost of the drilling rig, reduce the weight of the drilling rig, and reduce the complexity of the hydraulic oil circuit of the drilling rig.

[0048] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be understood to be within the scope of protection of the present invention.

Claims

1. A load-sensitive pump composite hydraulic system for a drilling rig, comprising a fuel tank (1), a mud pump (4), a left travel module (6), and a right travel module (7), characterized in that: The invention also includes a load-sensitive pump (2), a switching valve group (3) and a load-sensitive valve (5); the inlet end of the load-sensitive pump (2) is connected to the oil tank (1), the outlet end of the load-sensitive pump (2) is connected to the mud pump (4) through the switching valve group (3), and the outlet end of the load-sensitive pump (2) is connected to the load-sensitive valve (5); the load-sensitive valve (5) is connected to the left travel module (6) and the right travel module (7) respectively; the switching valve group (3) includes a first switching valve (31) and a second switching valve (32); the first switching valve (31) is connected to the load-sensitive pump (2) and the mud pump (4) respectively, and the second switching valve (32) is connected to the load-sensitive pump (2) and the load-sensitive valve (5) respectively.

2. The load-sensing pump combined hydraulic system for drilling rigs according to claim 1, characterized in that: The first switching valve (31) and the second switching valve (32) are both electromagnetic reversing valves; the outlet end of the load-sensing pump (2) is a P port, and the P port is respectively connected to the input ends of the first switching valve (31) and the second switching valve (32).

3. The load-sensing pump combined hydraulic system for drilling rigs according to claim 2, characterized in that: The load-sensing pump (2) further has an LS port, and the output end of the second switching valve (32) is connected to the LS port.

4. The load-sensing pump combined hydraulic system for drilling rigs according to claim 3, characterized in that: When no electric signal is input to the first switching valve (31), the circuit between the load-sensing pump (2) and the mud pump (4) is disconnected; when no electric signal is input to the second switching valve (32), the circuit between the load-sensing pump (2) and the LS port is disconnected.

5. The load-sensing pump combined hydraulic system for drilling rigs according to claim 4, characterized in that: The switching valve group (3) further comprises a relief valve (33), and the relief valve (33) is connected to the P port of the load-sensing pump (2).

6. The load-sensing pump combined hydraulic system for drilling rigs according to claim 5, characterized in that: The switching valve group (3) further comprises a throttle valve (34), and the throttle valve (34) is located between the overflow valve (33) and the P port of the load-sensing pump (2).

7. The load-sensing pump combined hydraulic system for drilling rigs according to claim 4, characterized in that: The first switching valve (31) is a two-position two-way electromagnetic directional valve, and the second switching valve (32) is a two-position three-way electromagnetic directional valve.

8. A load-sensing pump combined hydraulic system for a drilling rig according to any one of claims 1 to 7, characterized in that: The load-sensing valve (5) is respectively connected in parallel with the left travel module (6) and the right travel module (7).

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