Hydraulic system for crawler drilling machine

Abstract

The utility model relates to the technical field of underground drill rig equipment, in particular to a hydraulic system which comprises a main pump, an auxiliary pump, a main pump switching valve, an auxiliary pump switching valve, a posture adjusting valve, a multi-way reversing valve, a walking motor, a thrust oil cylinder, a hydraulic chuck and a hydraulic clamp holder, and the hydraulic chuck and the hydraulic clamp holder are connected with the multi-way reversing valve through a function switching valve. The multi-way reversing valve comprises an oil inlet P1, an oil inlet P2, a pressure measuring oil port G1 and an oil return port T; the oil outlet G1 is communicated with the oil inlet P1; an execution unit used for adjusting the oil pumping amount is arranged in the main pump, and the oil outlet G1 communicates with an oil inlet of the execution unit. The posture adjusting valve is independently controlled through the auxiliary pump to control the posture of the drilling machine; the main pump controls the drilling machine walking unit and the rotating unit through the main pump switching valve. The execution unit drives the main pump to adjust the oil discharge amount, the effect of rapidly adjusting the flow is achieved, the structure is simple, and cost is low. System heating can be reduced, and energy loss can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a roadway drilling rig equipment technical field especially relates to a hydraulic system. BACKGROUND

[0002] The hydraulic system of the roadway track drill mainly includes a walking hydraulic system, a posture adjustment hydraulic system and a drilling hydraulic system, in the hydraulic system of the prior art using a constant-displacement pump, the displacement of the constant-displacement pump is fixed, which leads to the flow generated by the system being much larger than the actual demand under low-load working conditions such as walking and posture adjustment, thereby causing energy waste and serious heating problems.On the contrary, under high-load working conditions such as drilling, if the displacement is too small, the system's demand for pressure and flow cannot be met.In order to solve the problem of the constant-displacement pump system, the traditional method is to manually adjust the displacement by a hand wheel.However, this method has many drawbacks: (1) complicated operation: manually rotating the hand wheel requires a lot of time and effort, especially under working conditions that require frequent displacement adjustment; (2) worker resistance: due to the complicated operation, many workers are reluctant to adjust the displacement, which may cause the system to run in an unreasonable state for a long time; (3) limited adjustment accuracy: manual adjustment is difficult to achieve accurate displacement control, which will affect the performance and stability of the system.

[0003] The current way to solve the above problems is to use a load-sensitive system, which is a high-efficiency, energy-saving and stable hydraulic circuit control technology.The system provides the required pressure-flow characteristics according to the load by combining a load-sensitive pump with a load-sensitive control valve, thereby reducing energy waste and heating problems.However, the complexity of the control elements and algorithms also leads to a relatively high cost of the load-sensitive system, and the complexity and precision of the system increase the difficulty and cost of maintenance. UTILITY MODEL CONTENTS

[0004] To solve the problems of heating, energy consumption and inconvenient flow adjustment of the existing track drill using a constant-displacement pump hydraulic system, and the high cost of using a load-sensitive pump, the utility model provides a hydraulic system for a track drill, which has the characteristics of reducing the heating and energy loss of the hydraulic system, quickly adjusting the flow and saving costs.

[0005] To achieve the above purpose, the following technical solutions are provided:

[0006] The hydraulic system for the caterpillar drilling machine comprises a main pump, a secondary pump, a main pump switching valve, a secondary pump switching valve, a posture adjusting valve, a multi-way reversing valve, a walking motor, a propelling oil cylinder, a hydraulic chuck and a hydraulic clamp, the oil suction input ends of the main pump and the secondary pump are communicated with an oil tank, the hydraulic chuck and the hydraulic clamp are connected with the multi-way reversing valve through a function switching valve, the multi-way reversing valve comprises an oil inlet P1, an oil inlet P2, a pressure measuring oil outlet G1 and an oil return T, the main pump is communicated with the oil inlet of the walking motor and the oil inlet P1 of the multi-way reversing valve through the main pump switching valve, the secondary pump is communicated with the oil inlet of the posture adjusting valve and the oil inlet P2 of the multi-way reversing valve through the secondary pump switching valve, the oil outlet G1 is communicated with the oil inlet P1, an execution unit for adjusting the oil quantity of the pump is arranged in the main pump, the oil outlet G1 is communicated with the oil inlet of the execution unit, and the oil return T is communicated with the oil tank.

[0007] Further, the main pump is a plunger pump, and the execution unit is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in transmission connection with the swash plate of the plunger pump.

[0008] Further, the multi-way reversing valve comprises a working oil port A3, a working oil port B4 and a working oil port A4, the first shuttle valve is connected in parallel between the working oil port B4 and the working oil port A4, the oil inlet P2 is communicated with the working oil port A4 in the multi-way reversing valve, the function switching valve comprises a chuck control valve, a clamp control valve, the oil return T, a working oil port J, a working oil port Z and a working oil port Y, the chuck is communicated with the working oil port J through a filter, the two ends of the hydraulic clamp are communicated with the working oil port Z and the working oil port Y respectively, the hydraulic clamp is internally provided with a reset spring, when the chuck control valve is in the lower position, the working oil port J is communicated with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve, when the chuck control valve is in the middle position, the working oil port J is communicated with the working oil port A3, when the chuck control valve is in the upper position, the working oil port J is communicated with the oil return T, when the clamp control valve is in the lower position, the working oil port Y is communicated with the working oil port A4, when the clamp control valve is in the middle position, the working oil port Z is communicated with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve, and when the clamp control valve is in the upper position, the working oil port Z is communicated with the working oil port B4.

[0009] Further, the hydraulic system further comprises a hydraulic control variable motor communicated with the hydraulic chuck, and the multi-way reversing valve further comprises a working oil port C1 and a working oil port B1, the working oil port C1 and the working oil port B1 are respectively communicated with the hydraulic control variable motor, and are used for controlling the forward rotation and the reverse rotation of the hydraulic control variable motor.

[0010] Further, the multi-way reversing valve further comprises a working oil port C4, the advancing port of the propelling oil cylinder is communicated with the working oil port C1 through a one-way valve, the retreating port is communicated with the working oil port C4 through a one-way balance valve, and the control oil path is communicated between the advancing port and the one-way balance valve.

[0011] The hydraulic system has the advantages that:

[0012] 1、 by the sub pump control posture valve, to control the attitude of the rig; the main pump through the main pump switch valve control rig walking unit and rotating unit; when the rig is walking, the oil pressure at the P1 port of the multi-way reversing valve is low, and the feedback of the G1 port to the execution unit is insufficient to control the main pump to increase the displacement; when the rig is drilling, the bit pressure rises, the pressure at the P1 port of the multi-way reversing valve rises, and the pressure at the G1 port rises, thereby feeding back the pressure to the execution unit, and the execution unit drives the main pump to adjust the oil discharge capacity, has the effect of quickly adjusting the flow, and the structure is simple and low in cost; it is helpful to reduce system heating and energy loss.

[0013] 2、 the sub pump is adjusted through the first shuttle valve with the main pump, controls the action of the hydraulic clamp and the hydraulic chuck. The PA5 port of the chuck control valve and the PC6 port of the clamp control valve always have oil inlet, so that the chuck and the clamp can be clamped and released separately at any time under any working condition, and the problem of poor safety caused by the traditional full hydraulic tunnel drilling rig in which the chuck is always open and the clamp is always closed is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the connection diagram of the hydraulic system of the utility model;

[0015] Figure 2 It is Figure 1 the hydraulic circuit connection diagram of the multi-way reversing valve and the function switch valve in the utility model;

[0016] Figure 3 It is Figure 1 the hydraulic circuit connection diagram of the multi-way reversing valve in the utility model;

[0017] Figure 4 It is Figure 1 the hydraulic circuit connection diagram of the function switch valve in the utility model;

[0018] Figure 5 It is the connection relationship structure diagram of the execution unit and the swash plate;

[0019] In the drawing: 1, main pump; 2, sub pump; 3, main pump switch valve; 4, sub pump switch valve; 5, posture valve; 6, multi-way reversing valve; 7, walking motor; 8, push oil cylinder; 9, hydraulic chuck; 10, hydraulic clamp; 11, oil tank; 12, execution unit; 13, swash plate; 14, plunger; 15, cylinder hole; 16, first shuttle valve; 17, chuck control valve; 18, clamp control valve; 19, filter; 20, hydraulic control variable motor; 21, rotation control valve; 22, hydraulic control valve; 23, industrial control valve; 24, feed control valve; 25, second shuttle valve; 26, sequence valve; 27, one-way balance valve; 28, function switch valve. DETAILED DESCRIPTION

[0020] The utility model discloses a hydraulic system for caterpillar drilling machine makes detailed instructions.

[0021] As Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in a kind of hydraulic system for caterpillar drilling machine, including main pump 1, auxiliary pump 2, main pump switching valve 3, auxiliary pump switching valve 4, posture adjusting valve 5, multi-way reversing valve 6, walking motor 7, propelling cylinder 8, hydraulic chuck 9 and hydraulic holder 10, and the oil suction input end of main pump 1, auxiliary pump 2 is communicated with oil tank 11;Its characterized in that, hydraulic chuck 9 and hydraulic holder 10 are connected with multi-way reversing valve 6 by function switching valve 28;Multi-way reversing valve 6 includes oil inlet P1, oil inlet P2, pressure measuring oil port G1, oil return port T;Main pump 1 is communicated with the oil inlet of walking motor 7 and the oil inlet P1 of multi-way reversing valve 6 by main pump 1 switching valve respectively;Auxiliary pump 2 is communicated with the oil inlet of posture adjusting valve 5 and the oil inlet P2 of multi-way reversing valve 6 by auxiliary pump switching valve 4 respectively;Oil outlet G1 is communicated with oil inlet P1;Execution unit 12 for adjusting pump oil volume is arranged in main pump 1, and oil outlet G1 is communicated with the oil inlet of execution unit 12;Oil return port T is communicated with oil tank 11.

[0022] In the scheme, posture adjusting valve 5 is controlled by auxiliary pump 2 alone to control the attitude of drilling machine;Main pump 1 controls drilling machine walking unit and rotating unit by main pump switching valve 3;When drilling machine walks, the oil pressure at the oil inlet P1 of multi-way reversing valve 6 is low, and the oil pressure at the feedback of pressure measuring port G1 to execution unit 12 is insufficient to control main pump 1 to increase displacement;When drilling machine drills, drill bit pressure rises, the pressure at the oil inlet P1 of multi-way reversing valve 6 rises, and the pressure at pressure measuring port G1 rises, thereby feedback to execution unit 12, and execution unit 12 drives main pump 1 to adjust oil discharge volume, with the effect of quickly adjusting flow, and simple structure and low cost;It is helpful to reduce system heating and energy loss.In the embodiment, main pump 1 is plunger pump, and execution unit 12 is hydraulic cylinder, and the telescopic rod of hydraulic cylinder is drivingly connected with swash plate 13 of plunger pump. Figure 5As shown, the cylinder has a plurality of plunger 14 holes, the plunger 14 reciprocating motion in the hole. The plunger 14 and cylinder hole 15 form a closed volume, by changing the size of this closed volume to achieve oil and oil. The plunger 14 in the plunger pump is arranged in an axial direction, that is, the center line of the plunger 14 is parallel to the axis of the transmission shaft. The plunger 14 reciprocating motion in the cylinder, while the plunger 14 and the pump cylinder and swash plate 13 relative to the rotating motion; the axis of the swash plate 13 and the cylinder axis has an angle of inclination, the angle determines the length of the plunger 14 in the cylinder and the displacement of the pump. The plunger 14 with a spherical end and swash plate 13 contact, when the swash plate 13 rotates, through the swash plate 13 inclined surface to push the plunger 14 reciprocating motion in the cylinder. In this scheme, the hydraulic circuit driven by the feedback from the pressure measuring port G1 to change the angle of the swash plate 13, the size of the plunger pump is adjusted conveniently, and the adjustment speed is fast, the accuracy is high, which is beneficial to reduce the system heating, reduce energy loss.

[0023] In this embodiment, the multi-way switching valve includes a rotary control valve 21, a hydraulic control valve 22, a working control valve 23 and a feed control valve 24, which adopts the scheme in the patent No. CN201721207111.5, named "Full hydraulic tunnel drilling rig multi-way reversing valve 6". The oil inlet P1, the oil inlet P2, the pressure measuring oil port G1, the oil return port T, the working oil port A3, the working oil port B4, the working oil port A4, the working oil port C1 and the working oil port B1, the working oil port C4 can adopt the oil port structure in the multi-way reversing valve 6. The hydraulic principle of each oil circuit of the multi-way switching valve is not described in detail here.

[0024] The rotary control valve 21 in this scheme is equivalent to the rotary valve in the patent; the feed control valve 24 is equivalent to the feed valve in the patent; the hydraulic control valve 22 and the working condition control valve are equivalent to the switching valve in the patent; the second shuttle valve 25 is equivalent to the hydraulic control one-way valve 13 in the patent, and the oil port communication mode in this scheme is basically the same as that in the patent. In addition, the hydraulic variable motor, the hydraulic chuck 9, the hydraulic clamp 10 and the push oil cylinder 8 in this scheme have the same structure and function as the corresponding devices in the patent with the publication No. CN107448430A.

[0025] The multi-way reversing valve 6 and the function switching valve 28 in this scheme each contain a plurality of control valves. In actual design, the valves can be arranged in a valve block or dispersedly arranged. In order to facilitate management, the valves in this scheme are arranged in a valve block.

[0026] In the present scheme, the rotary control valve 21 is a four-position five-way valve, the internal oil port includes the oil inlet P1; the oil return port T1; the internal oil port A1, B1, C1; the hydraulic control valve 22 is a three-position five-way valve, the internal oil port includes the oil inlet P2; the oil return port T2; the working oil port A2, B2, C2; the control oil port K1, K2, K3. K1, K2 two control oil ports are arranged at the front end, the control oil port K3 is arranged at the rear end, and the rear end is also provided with an elastic device; the working condition control valve is a three-position six-way valve, the internal oil port includes the oil inlet PA3, PB3, PC3; the working oil port A3, B3, C3; the feed control valve 24 is a three-position four-way valve, the internal oil port includes the oil inlet P4; the oil return port T4; the working oil port C4, B5; the chuck control valve 17 is a three-position four-way valve, the internal oil port includes the oil inlet PA5, PB5; the oil return port T5; the working oil port A5; the gripper control valve 18 is a three-position six-way valve, the internal oil port includes the oil inlet PA6, PB6, PC6; the oil return port T6; the working oil port A6, B6.

[0027] The specific differences between the present scheme and the existing patent also include:

[0028] (1) The present scheme increases the chuck control valve 17 and the gripper control valve 18

[0029] Action: The conventional drilling operation is in the middle position without operation, and the chuck and the gripper can be linked according to the rotation of the valve piece, the feed valve piece and the control valve piece; in addition, the present scheme can separately control the chuck and the gripper when needed.

[0030] (2) The three-position six-way valve in the switching valve cancels the adjusting rod

[0031] In the original scheme, the adjusting rod is used to adjust the stroke of the three-position six-way valve, specifically, when the adjusting rod is rotated out and K1 is filled with oil, the three-position six-way valve is in the front position; when the adjusting rod is rotated in and K1 is filled with oil, the three-position six-way valve is in the middle position, which causes the adjusting rod to be inconvenient to operate (screw structure). However, the present scheme uses the chuck control valve 17 and the gripper control valve 18 to adjust the control position of the valve core, which can separately control the chuck and the gripper, and is convenient to adjust.

[0032] The multi-way reversing valve 6 includes the working oil port A3, the working oil port B4, the working oil port A4; the first shuttle valve 16 is connected in parallel between the working oil port B4 and the working oil port A4, and the oil inlet P2 is communicated with the working oil port A4 inside the multi-way reversing valve 6; the function switching valve 28 includes the chuck control valve 17, the gripper control valve 18, the oil return port T, the working oil port J, the working oil port Z, the working oil port Y; the chuck is communicated with the working oil port J through the filter 19, and the hydraulic gripper 10 is communicated with the working oil port Z and the working oil port Y at both ends; the hydraulic gripper 10 is provided with a reset spring inside.

[0033] In the working process of the drilling rig, many faults are caused by the quality of the hydraulic oil, which has great influence on the working performance of the hydraulic system. Therefore, the hydraulic oil filter 19 is installed at a proper position to intercept the pollutants in the oil, keep the oil clean, ensure the normal working of the oil system, and prevent the oil pollution. Therefore, the filter 19 is used to treat the hydraulic oil on the pipeline, and the device can filter out the solid impurities in the hydraulic system.

[0034] In the embodiment, the chuck control valve 17 is a three-position four-way valve, the working oil port J acts on the oil inlet of the hydraulic chuck 9, and is in communication with the internal oil port A5 of the three-position four-way valve. When the chuck control valve 17 is in the lower position, the internal oil port A5 of the chuck control valve 17 is in communication with the internal oil port PB5, and the working oil port J is in communication with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve 16. The hydraulic chuck 9 clamps the drilling tool.

[0035] When the chuck control valve 17 is in the middle position, the internal oil port A5 is in communication with the internal oil port PA5, so that the working oil port J is in communication with the working oil port A3 through the chuck control valve 17.

[0036] When the chuck control valve 17 is in the upper position, the working oil port J is in communication with the oil return port T, and the internal oil port A5 is in communication with T5. The hydraulic chuck 9 releases the drilling tool.

[0037] In the embodiment, the chuck control valve 18 is a three-position six-way valve. When the chuck control valve 18 is in the lower position, the internal oil port A6 of the chuck control valve 18 is in communication with PA6, and the working oil port Y is in communication with the working oil port A4. The chuck clamps the drilling tool.

[0038] When the chuck control valve 18 is in the middle position, the internal oil port T6 of the chuck control valve 18 is in communication with PC6, and the working oil port Z is in communication with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve 16. The chuck and the holder are linked to act.

[0039] When the chuck control valve 18 is in the upper position, the internal oil port T6 of the chuck control valve 18 is in communication with PB6, and the working oil port Z is in communication with the working oil port B4. The working oil port B4 is connected to the oil return port T of the multi-way switching valve, and the holder is released.

[0040] Through the above-mentioned hydraulic circuit, the chuck control valve 17 can be operated in single-action release, single-action clamping and holder linkage operation. The holder can also be operated in single-action release, single-action clamping and chuck linkage operation.

[0041] The auxiliary pump 2 is adjusted by the first shuttle valve 16 to control the action of the hydraulic clamp 10 and the hydraulic chuck 9. The PA5 port of the chuck control valve 17 and the PC6 port of the clamp control valve 18 are always supplied with oil, so that the chuck and the clamp can be clamped and released separately at any time and under any working condition, overcoming the poor safety of the conventional full hydraulic tunnel drilling rig in which the chuck is always open and the clamp is always closed.

[0042] The hydraulic control variable motor 20 is also connected to the hydraulic chuck 9, and the multi-way directional valve 6 further comprises a working oil port C1 and a working oil port B1, which are respectively connected to the hydraulic control variable motor 20 to control the forward rotation and the reverse rotation of the hydraulic control variable motor 20.

[0043] The multi-way directional valve 6 further comprises a working oil port C4, the forward port of the advancing oil cylinder 8 is connected to the working oil port C1 through a one-way valve, the backward port is connected to the working oil port C4 through a one-way balance valve 27, and a control oil path is connected between the forward port and the one-way balance valve 27.

[0044] The hydraulic oil in the internal oil port C4 of the feed control valve 24 is connected to the backward oil port of the advancing oil cylinder 8 through the one-way balance valve 27, and the forward oil port is connected to the internal oil port B5 of the feed control valve 24 through a control oil path, so that the oil in the backward oil cylinder flows into the multi-way directional valve 6. The forward oil port is connected to the internal oil port B5 of the feed control valve 24 through a balance valve. The one-way balance valve 27 mainly plays a locking role. When the advancing oil cylinder 8 is fed, the oil can flow through the one-way balance valve smoothly and cannot return, so that the gravity of the drilling tool can be prevented from causing the backward movement during the upward angle drilling. However, when the advancing oil cylinder 8 needs to be retracted, the oil in the backward end of the advancing oil cylinder 8 can enter the control oil port, so that the oil in the forward end can flow back.

Claims

1. A hydraulic system for a caterpillar drilling rig, comprising a main pump (1), a secondary pump (2), a main pump switching valve (3), a secondary pump switching valve (4), an attitude adjusting valve (5), a multi-way reversing valve (6), a travelling motor (7), the oil suction input ends of the main pump (1) and the secondary pump (2) being communicated with an oil tank (11); characterized in that, The multi-way directional valve (6) comprises an oil inlet P1, an oil inlet P2, a pressure measuring oil port G1 and an oil return port T; the main pump (1) is communicated with the oil inlet of the traveling motor (7) and the oil inlet P1 of the multi-way directional valve (6) through the main pump switching valve (3); the auxiliary pump (2) is communicated with the oil inlet of the posture adjusting valve (5) and the oil inlet P2 of the multi-way directional valve (6) through the auxiliary pump switching valve (4); the oil outlet port G1 is communicated with the oil inlet P1; the main pump (1) is internally provided with an execution unit (12) for adjusting the pump oil amount, and the oil outlet port G1 is communicated with the oil inlet of the execution unit (12); the oil return port T is communicated with the oil tank (11).

2. The hydraulic system for a track drill as claimed in claim 1, characterised in that, The hydraulic chuck (9) and the hydraulic clamp (10) are connected with the multi-way directional valve (6) through a function switching valve (28).

3. The hydraulic system for a track drill as claimed in claim 2, characterised in that, The multi-way directional valve (6) comprises a working oil port A3, a working oil port B4 and a working oil port A4; the first shuttle valve (16) is connected in parallel between the working oil port B4 and the working oil port A4; the oil inlet P2 is communicated with the working oil port A4 inside the multi-way directional valve (6); the function switching valve (28) comprises a chuck control valve (17), a clamp control valve (18), an oil return port T, a working oil port J, a working oil port Z and a working oil port Y; the chuck is communicated with the working oil port J through a filter (19), and the hydraulic clamp (10) is communicated with the working oil port Z and the working oil port Y at both ends; the hydraulic clamp (10) is internally provided with a reset spring; when the chuck control valve (17) is in the lower position, the working oil port J is communicated with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve (16); when the chuck control valve (17) is in the middle position, the working oil port J is communicated with the working oil port A3; when the chuck control valve (17) is in the upper position, the working oil port J is communicated with the oil return port T; when the clamp control valve (18) is in the lower position, the working oil port Y is communicated with the working oil port A4; when the clamp control valve (18) is in the middle position, the working oil port Z is communicated with the working oil port B4 or the working oil port A4 with higher oil pressure through the first shuttle valve (16); when the clamp control valve (18) is in the upper position, the working oil port Z is communicated with the working oil port B4.

4. A hydraulic system for a track drill as claimed in claim 2 or 3, characterised in that, The hydraulic chuck (9) and the hydraulic clamp (10) are connected with the multi-way directional valve (6) through a function switching valve (28).

5. A hydraulic system for a track drill as claimed in claim 2 or 3, characterised in that, The multi-way directional valve (6) further comprises a working oil port C1 and a working oil port B1, which are respectively communicated with the hydraulic variable motor (20) for controlling the forward rotation and the reverse rotation of the hydraulic variable motor (20).

6. The hydraulic system for a track drill as claimed in claim 4, characterised in that, The multi-way directional valve (6) further comprises a working oil port C4, the forward inlet of the advancing oil cylinder (8) is communicated with the working oil port C1 through a one-way valve; the backward inlet is communicated with the working oil port C4 through a one-way balance valve (27); a control oil path is communicated between the forward inlet and the one-way balance valve (27). The multi-way directional valve (6) further comprises a working oil port C4, the forward inlet of the advancing oil cylinder (8) is communicated with the working oil port C1 through a one-way valve; the backward inlet is communicated with the working oil port C4 through a one-way balance valve (27); a control oil path is communicated between the forward inlet and the one-way balance valve (27).

7. A hydraulic system for a track drill as claimed in claim 1, 2, 3 or 6, characterised in that, The main pump (1) is a plunger pump, the execution unit (12) is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in driving connection with the swash plate (13) of the plunger pump.

8. The hydraulic system for a track drill as set forth in claim 4, wherein, The main pump (1) is a plunger pump, the execution unit (12) is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in driving connection with the swash plate (13) of the plunger pump.

9. The hydraulic system for a track drill as set forth in claim 5, wherein, The main pump (1) is a plunger pump, the execution unit (12) is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in driving connection with the swash plate (13) of the plunger pump.

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