Full-hydraulic driving device of portable core drill

Abstract

The utility model discloses a portable core drill full-hydraulic driving device which comprises a fuel engine, a variable pump, a multi-way reversing valve, a control cabinet and a high-pressure automatic variable displacement motor, and an output shaft of the fuel engine is in connection transmission with an input shaft of the variable pump; an oil inlet of the variable pump is connected with an oil tank, an output oil pipe is connected to a port P of the multi-way reversing valve, and an output port of the multi-way reversing valve is connected with a port A and a port B of the high-pressure automatic variable displacement motor. A feedback oil port of a variable actuating mechanism of the variable pump is connected to an oil conveying pipe A and an oil conveying pipe B of the high-pressure automatic variable displacement motor through a feedback pipe A and a feedback pipe B. A high-pressure automatic variable displacement motor is matched with a torque (hydraulic) feedback control system, instant changes of different drilling working conditions are achieved, the optimal matching of torque and rotating speed is obtained, the rotating speed is matched with the torque all the time, the optimal drilling efficiency is obtained, an electric control proportional variable displacement pump is adopted, and oil consumption is reduced.

Description

Technical Field

[0001] The utility model relates to a hydraulic drive system, in particular to a portable full-hydraulic drive device for a core drill. Background Art

[0002] A core is a rock sample. Core drilling refers to the use of an annular drill bit and related tools to extract the core from the surface to a specified depth by drilling a hole. The equipment used for core drilling operations is a core drill rig.

[0003] During the core drilling operation, several to hundreds of operating points are often pre-set in the same operating area, and the distance between adjacent operating points generally ranges from hundreds to thousands of meters. Therefore, within the same drilling construction operation cycle, the core drilling rig needs to complete the transfer between different operating points safely and quickly.

[0004] At present, the hydraulic systems of fully hydraulic portable core drills produced by domestic and foreign manufacturers all use the matching of gear pumps and gear motors. Since they are all quantitative, the speed of the drill can only be controlled by the throttle size and diversion of the engine. The unit torque of the motor is constant, and the matching of speed and torque cannot be adjusted according to the drilling depth and the change of the load in the hole, which increases a lot of fuel consumption; when drilling in complex formations, the engine cannot continue to work and shuts down at the beginning of drilling, and the engine with the same power cannot drill to a greater depth. The existing technology has obvious energy waste and insufficient adaptability.

[0005] The prior art has the following problems:

[0006] 1: The displacement of the gear pump is fixed, and the flow of hydraulic oil can only be changed by increasing or decreasing the speed of the engine; or by increasing the number of engines and oil pumps; resulting in increased fuel consumption.

[0007] 2: The motor displacement is quantitative, and the motor output speed depends on the amount of hydraulic oil flow. You can only replace the motor with a smaller displacement to increase the speed, or replace the motor with a larger displacement to increase the torque. It cannot better meet the requirements of drilling torque and speed in the same borehole, different depths, different formations, different diameters and other working conditions.

[0008] 3: The unit torque of the motor is fixed. To increase or decrease the output torque of the motor, you can only rely on the size of the hydraulic system pressure and change the displacement size of the motor. It is inconvenient and impossible to change during the drilling process.

[0009] 4: The drilling efficiency is directly proportional to the rotation speed that the drilling equipment can provide. The higher the rotation speed, the faster the drilling speed. The optimal rotation speed depends on the relationship between the type of formation being drilled, the capacity of the drilling rig, the drilling equipment used, and the personal drilling method. The existing technology uses a quantitative pump and a quantitative motor, and the rotation speed will not automatically adjust and change with the torque, and the efficiency is low. Utility Model Content

[0010] The technical problem to be solved by the utility model is to provide a portable fully hydraulic drive device for core drilling rigs to solve the technical problems existing in the above-mentioned background technology, so as to adapt to complex drilling conditions without replacing the motor and the oil pump, so that the speed and torque of the motor are automatically matched with the external conditions, thereby reducing fuel consumption.

[0011] In order to solve the above technical problems, the technical solution of the utility model is:

[0012] A portable core drilling rig full hydraulic drive device comprises a fuel engine, a variable pump, a multi-way reversing valve, a control cabinet and a high-pressure automatic variable motor, wherein the output shaft of the fuel engine is connected to the input shaft of the variable pump for transmission; the oil inlet of the variable pump is connected to the oil tank, the output oil pipe is connected to the P port of the multi-way reversing valve, and the output port of the multi-way reversing valve is respectively connected to the A port and the B port of the high-pressure automatic variable motor; wherein the feedback oil port of the variable actuator of the variable pump is connected to the oil delivery pipe A and the oil delivery pipe B of the high-pressure automatic variable motor through the feedback pipe A and the feedback pipe B; and check valves are respectively installed on the feedback pipe A and the feedback pipe B, and the pilot oil port of the variable actuator is connected to the external control oil pipe A; the control circuits of the fuel engine, the variable pump and the multi-way reversing valve are all connected to the control cabinet.

[0013] Furthermore, the high-pressure automatic variable motor adopts a bevel-axis variable piston motor, whose variable actuator includes a pilot cylinder, a variable cylinder, a double-headed piston rod, a shift rod and a positioning spring mechanism. The pilot cylinder and the variable cylinder are respectively installed at both ends of the double-headed piston rod, and the shift rod is laterally fixed in the middle of the double-headed piston rod. One end of the shift rod is hinged to the universal ball in the cylinder body of the high-pressure automatic variable motor to drive the cylinder body to change the angle with the end flange of the output shaft, and the other end of the shift rod is fixed to the top of the positioning spring mechanism.

[0014] Furthermore, it also includes an oil tank, the oil tank outlet is connected to the oil suction port of the variable pump through an oil suction pipe, and the oil tank inlet is connected to the return pipe.

[0015] Furthermore, the variable displacement pump adopts an electronically controlled proportional variable displacement pump.

[0016] Furthermore, the external control oil pipe A is connected to the relief valve, and the relief valve is connected to the gear oil pump, and the pilot pressure is provided by the gear oil pump.

[0017] Furthermore, the feedback oil port is also connected to the external control oil pipe B.

[0018] The utility model is beneficial in that:

[0019] (1) The utility model adopts a high-pressure automatic variable motor to achieve instantaneous changes in different drilling conditions and obtain the best match between torque and speed. It can make the speed the highest while meeting the drilling load (torque). The displacement of the motor changes automatically. When the external load increases, the motor displacement automatically increases and the speed decreases, thereby obtaining a greater torque, so that the speed is always matched with the torque, thereby obtaining the best drilling efficiency.

[0020] (2) The utility model adopts an electronically controlled proportional variable pump. Under low-load conditions, the engine can run at a low speed. By increasing the displacement of the oil pump, the motor can still obtain a high speed. The fuel flow of the diesel engine can be reduced by 1 to 3 times. The electronically controlled proportional variable of the electronically controlled proportional variable pump solves the energy loss caused by traditional shunt speed regulation. The electronically controlled proportional variable can steplessly control the displacement of the pump according to the program. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a bent axis variable displacement piston motor;

[0022] Figure 2 This is the equivalent hydraulic control principle diagram of the utility model.

[0023] In the figure: 1-high pressure automatic variable motor, 1a-oil delivery pipe A, 1b-oil delivery pipe B, 11-variable oil cylinder, 12-double-headed piston rod, 121-shift rod, 13-pilot oil cylinder, 14-positioning spring mechanism, 15-universal ball, 16-cylinder body, 17-plunger, 18-flange, X-feedback oil port, G-pilot oil port, 2-feedback pipe A, 2a-check valve, 21-feedback pipe B, 3-external control oil pipe A, 31-external control oil pipe B, 4-multi-way reversing valve, 5-oil tank, 6-variable pump, 61-output pipe, 62-return pipe, 63-suction pipe, 7-fuel engine, 8-control cabinet. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1-2 As shown:

[0026] A portable core drilling rig full hydraulic drive device comprises a fuel engine 7, a variable pump 6, a multi-way reversing valve 4, a control cabinet 8 and a high-pressure automatic variable motor 1, wherein the output shaft of the fuel engine 7 is connected to the input shaft of the variable pump 6 for transmission; the output pipe 61 and the return pipe 62 of the variable pump are connected to the inlet side of the multi-way reversing valve 4, and the outlet side of the multi-way reversing valve 4 is respectively connected to the oil delivery pipe A1a and the oil delivery pipe B1b of the high-pressure automatic variable motor 1; wherein the feedback oil port X of the variable actuator of the variable pump is connected to the oil delivery pipe A1a and the oil delivery pipe B1b of the high-pressure automatic variable motor 1 through the feedback pipe A2 and the feedback pipe B21; and the check valve 2a is respectively installed on the feedback pipe A2 and the feedback pipe B21, and the pilot oil port G of the variable actuator is connected to the external control oil pipe A3; the control lines of the fuel engine 7, the variable pump and the multi-way reversing valve 4 are all connected to the control cabinet 8.

[0027] In the utility model, the high-pressure automatic variable motor 1 is recommended to adopt a bevel axis variable piston motor, and of course a slant plate type can also be adopted (the principle and structure of the hydraulic motor are mature mechanical technologies, and other components and principles are not described in detail in this article). Its variable actuator includes a pilot cylinder 13, a variable cylinder 11, a double-headed piston rod 12, a shift rod 121 and a positioning spring mechanism 14. The pilot cylinder 13 and the variable cylinder 11 are respectively installed at both ends of the double-headed piston rod 12, and the shift rod 121 is laterally fixed to the middle part of the double-headed piston rod 12. One end of the shift rod 121 is hinged to the universal ball 15 in the cylinder body 16 of the high-pressure automatic variable motor 1, thereby driving the cylinder body 16 to change the angle with the end flange 18 of the output shaft, and the other end of the shift rod 121 is fixed to the top of the positioning spring mechanism 14.

[0028] The principle of automatic adjustment of the speed and torque of the high-voltage automatic variable motor 1 in the utility model is as follows:

[0029] The hydraulic changes on both sides of the high-pressure automatic variable motor 1 are collected through feedback pipes A2 and B21. There will be a pressure difference between the inlet side and the outlet side. Therefore, in order to uniformly adjust the pressure, it is necessary to monitor the pressure changes on the inlet side as feedback pressure. Since the motor needs to rotate in both directions, the inlet side and the outlet side will switch with the direction (the direction of the hydraulic oil flow inside the high-pressure automatic variable motor 1 is changed by the multi-way reversing valve 4), but the pressure on the inlet side will be greater.

[0030] In the present invention, the feedback pipe A2 and the feedback pipe B21 are both connected to the feedback oil port X, and the feedback pipe A2 and the feedback pipe B21 are also connected, and a check valve 2a is installed thereon. When the hydraulic oil on the inlet side enters, the check valve 2a on the outlet side will be closed, so that the variable cylinder 11 always only receives pressure feedback from the inlet side.

[0031] That is, the hydraulic oil pressure of the driving variable cylinder 11 is consistent with the pressure on the inlet side, but when the external torque changes within a small range, it does not need to be adjusted (the motor maintains the minimum displacement, minimum torque, and maximum speed), so a pilot cylinder 13 is also provided, and the pilot cylinder 13 applies an initial pressure through the external control oil pipe A3 (specifically, the external control oil pipe A3 can be connected to the overflow valve, and the overflow valve is connected to the gear oil pump, and the pilot pressure is provided by the gear oil pump. The overflow valve mainly plays the role of unloading and safety protection of the constant pressure overflow stabilizing system. Of course, it is not limited to this method, and other mechanisms that can provide stable hydraulic pressure can also be used). This initial pressure is adjusted Lower limit, only when the pressure of the hydraulic oil exceeds the set lower limit, the variable cylinder 11 can overcome the pressure of the pilot cylinder 13 and push the double-headed piston rod 12 to move. When the double-headed piston rod 12 moves, the lever 121 will compress the positioning spring mechanism 14. Since the elastic force of the spring = KX, that is, the position of the double-headed piston rod 12 when balanced is related to the pressure difference between the pilot cylinder 13 and the variable cylinder 11, and has nothing to do with the pressure, thereby achieving the purpose of setting the adjustment starting point by the pilot cylinder 13. In order to buffer the fluctuations and changes of the hydraulic oil, an oil tank 5 can be set, and the outlet of the oil tank 5 is connected to the oil suction port of the variable pump 6 through the oil suction pipe 63, and the inlet is connected to the return pipe 62.

[0032] In order to enable over-control in special circumstances and achieve high torque and low speed, the feedback oil port is also connected to the external control oil pipe B31. Under normal working conditions, the feedback oil port pressure feedback comes from feedback pipes A and B, and is automatically adjusted according to the external torque. However, if manual over-control adjustment is required, it is only necessary to apply a hydraulic pressure directly from the external control oil pipe B. This hydraulic pressure is greater than the system hydraulic pressure, which directly increases the displacement of the motor, increases the torque, and reduces the speed.

[0033] The movement of the lever 121 will drive the universal ball 15 in the cylinder body 16 to move, thereby changing the angle between the cylinder body 16 and the flange 18 at the end of the output shaft. In this way, the stroke of the plunger in the cylinder body 16 will become longer, the displacement of the motor will become larger, the torque will become larger, and the corresponding speed will become lower, thereby achieving automatic matching of the motor speed with the external torque demand.

[0034] At present, the portable core drilling rigs of domestic and foreign manufacturers are driven by quantitative pumps and quantitative motors. The conventional combination is shown in Table 1. The following is an analysis of the working conditions of the existing technology.

[0035] The matching of portable core drilling rigs - engines, oil pumps and motors of domestic and foreign manufacturers

[0036]

[0037] Table 1

[0038] From the numbers 1 and 2 in the above table, it can be seen that: in the case of one engine: the increase in the speed of the power head can only be achieved by increasing the engine speed and reducing the displacement of the motor; if a large-displacement motor is used, even if the engine is turned on to the rated speed, the speed of the power head is still very low. For working conditions that do not require excessive torque such as drilling, the fuel economy is relatively low, because the higher the speed, the higher the efficiency of drilling; if it is replaced with a small-displacement motor, although the speed is increased, the output torque of the power head becomes smaller at the same time, and it cannot meet the changes in the load in the hole in time. When the drill rod is under a large external torque, it is easy to cause drill jamming and other conditions.

[0039] It can be seen from No. 3 in the table above that changing the displacement of the oil pump can increase the output speed of the power head to a certain extent, but the output torque is reduced, because for the same type of oil pump, the larger the displacement, the lower the rated pressure and speed.

[0040] It can be seen from numbers 4 and 5 in the above table that only by increasing the number of engines and oil pumps can the output speed of the power head be increased without affecting the output torque. However, three engines need to be started at the same time and at the rated speed to achieve the optimal speed parameters during drilling, which increases fuel consumption a lot.

[0041] Next, the working conditions of the present invention are analyzed. The present invention adopts a high-pressure automatic variable motor 1 and an electronically controlled proportional variable pump, as shown in Table 2.

[0042]

[0043] Table 2

[0044] As can be seen from No. 1, in the stage of drilling to shallow hole, the load in the hole is small, the engine speed can be lower, the displacement of variable pump 6 is opened to the maximum, and the displacement of variable motor will be automatically adjusted to the minimum displacement due to the low external torque and adjustment value. At this time, fuel consumption can be reduced and a higher drilling speed can be met;

[0045] From No. 2, it can be seen that when drilling in complex formations, the maximum torque can be obtained without replacing the motor;

[0046] From numbers 3 and 4, we can see that one engine can achieve both maximum torque and maximum speed. As the drilling depth, load in the hole and working conditions change, the motor displacement changes automatically, and the output torque and speed of the drilling rig also change accordingly, which is more in line with the working conditions during drilling.

[0047] Compared with the prior art that uses a quantitative pump and a quantitative motor, the utility model selects a more reasonable control drive structure, which is more in line with the working conditions of the core drill during the drilling process. As the borehole changes from shallow to deep, the load in the hole generally changes from small to large. The load in the hole will change depending on the hardness of the rock being drilled, the complete formation or the complex formation, and the hardness of the rock being drilled. Even in the same drilling cycle, the load in the hole changes rapidly, that is, the speed and torque of the output motor change rapidly.

[0048] The utility model adopts a high-pressure automatic variable motor 1 to achieve instantaneous changes in different drilling conditions and obtain the best match between torque and speed. Under the condition of satisfying the drilling load (torque), the speed can be maximized and the displacement of the motor changes automatically. When the external load increases, the motor displacement automatically increases and the speed decreases, thereby obtaining a greater torque, so that the speed is always matched with the torque, thereby obtaining the best drilling efficiency.

[0049] Moreover, the utility model adopts the electronically controlled proportional variable of the electronically controlled proportional variable pump to solve the energy loss caused by the traditional shunt speed regulation. The electronically controlled proportional variable can steplessly control the displacement of the pump according to the program. The maximum torque can be obtained by coordinating the minimum displacement of the variable pump 6 with the maximum displacement of the variable pump 6, and the maximum speed can be obtained by coordinating the maximum displacement of the variable pump 6 with the minimum displacement of the variable pump 6. Under normal working conditions, the variable motor automatically adjusts the displacement according to the change of external torque (reflected by the change of hydraulic oil pressure), so that the speed and torque are matched. It can run at the maximum allowable speed while maintaining the normal drilling torque requirement, which greatly improves the work efficiency and reduces energy consumption.

[0050] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A portable core drilling rig fully hydraulic drive device, characterized in that: It includes a fuel engine, a variable pump, a multi-way reversing valve, a control cabinet and a high-pressure automatic variable motor, wherein the output shaft of the fuel engine is connected to the input shaft of the variable pump for transmission; the oil inlet of the variable pump is connected to the oil tank, the output oil pipe is connected to the P port of the multi-way reversing valve, and the output port of the multi-way reversing valve is respectively connected to the A port and the B port of the high-pressure automatic variable motor; wherein the feedback oil port of the variable actuator of the variable pump is connected to the oil delivery pipe A and the oil delivery pipe B of the high-pressure automatic variable motor through the feedback pipe A and the feedback pipe B; and check valves are respectively installed on the feedback pipe A and the feedback pipe B, and the pilot oil port of the variable actuator is connected to the external control oil pipe A; the control lines of the fuel engine, the variable pump and the multi-way reversing valve are all connected to the control cabinet.

2. The portable core drilling rig fully hydraulic drive device according to claim 1, characterized in that: The high-pressure automatic variable motor adopts a bevel-axis variable piston motor, and its variable actuator includes a pilot cylinder, a variable cylinder, a double-headed piston rod, a shift rod and a positioning spring mechanism. The pilot cylinder and the variable cylinder are respectively installed at both ends of the double-headed piston rod, and the shift rod is transversely fixed in the middle of the double-headed piston rod. One end of the shift rod is hinged to the universal ball in the cylinder body of the high-pressure automatic variable motor to drive the cylinder body to change the angle with the end flange of the output shaft, and the other end of the shift rod is fixed to the top of the positioning spring mechanism.

3. The portable core drilling rig fully hydraulic drive device according to claim 1, characterized in that: The utility model also comprises an oil tank, wherein an outlet of the oil tank is connected to an oil suction port of a variable pump through an oil suction pipe, and an inlet of the oil tank is connected to a return pipe.

4. The portable core drilling rig fully hydraulic drive device according to claim 1, characterized in that: The variable displacement pump adopts an electronically controlled proportional variable displacement pump.

5. The portable core drilling rig fully hydraulic drive device according to claim 1, characterized in that: The external control oil pipe A is connected to the relief valve, and the relief valve is connected to the gear oil pump, and the pilot pressure is provided by the gear oil pump.

6. The portable core drilling rig fully hydraulic drive device according to claim 1, characterized in that: The feedback oil port is also connected to the external control oil pipe B.

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