ES2427345T3 - Drilling apparatus - Google Patents

Abstract

A drilling apparatus for drilling the subsoil with: - at least a first hydraulic drive (11) and at least a second hydraulic drive (111), - at least a first hydraulic pump (12) and at least one second hydraulic pump (112) that are conductively communicated for the transmission of energy by means of a hydraulic fluid with the first hydraulic drive (11) and the second hydraulic drive (111), and - a rotating motor (2) with an output shaft (4) to which a torque is applied for the emission of a preset engine capacity, through which the first hydraulic pump (12) and the second hydraulic pump (112) are operated, where the capacity of the rotating motor (2) is distributed between the first hydraulic pump (12) and the second hydraulic pump (112), characterized in that - a first pumping control (18) and a second pumping control (118) for capacity control are provided Pumping unit to be delivered by the first hydraulic pump (12) and the second hydraulic pump (112), respectively, - an adjustment device (6) is provided for the adjustment of different distributions of the rotating motor capacity (2) between the first hydraulic pump (12) and the second hydraulic pump (112), and - the adjustment device (6) has a control element (70) with which a capacity distribution ratio of the rotating motor can be adjusted ( 2) between the first hydraulic pump (12) and the second hydraulic pump (112).

Description

Drilling apparatus

Description

The invention relates to a drilling apparatus for drilling the subfloor according to the general concept of claim 1 as well as a method for operating a drilling device according to the general concept of claim 12.

The drilling apparatus comprises at least a first hydraulic drive and at least a second hydraulic drive, at least a first hydraulic pump and at least a second hydraulic pump that is conductively connected to the transmission of energy by means of a hydraulic fluid with the first hydraulic drive and the second hydraulic drive, respectively, a first pumping control and a second pumping control to control the pumping capacity to be delivered by the first hydraulic pump and the second hydraulic pump, respectively and a motor rotating with an output shaft in which for the emission of a preset engine capacity there is a torque through which the first hydraulic pump and the second hydraulic pump are operated.

In the procedure for the operation of an apparatus for drilling the subsoil it is provided that at least a first drive and at least a second hydraulic drive is operated, the first hydraulic drive is supplied with hydraulic fluid by a first hydraulic pump that is conductively communicated with the first hydraulic drive and the second hydraulic drive is supplied with hydraulic fluid by means of a second hydraulic pump that is conductively communicated with the second hydraulic drive, a pumping capacity to be delivered by the first hydraulic pump is controlled by a First pumping control and a pumping capacity that is to be delivered by the second hydraulic pump is controlled by a second pumping control and the hydraulic pumps are driven by a rotating motor in common.

The drilling apparatus may, for example, be an apparatus for drilling with a double head with an inner linkage and an external linkage. By way of example, the linkages may be provided to drive a drilling tool or a percussion mechanism or to serve as a drive for a movement mechanism of the drilling apparatus.

The hydraulic pumps according to the invention are driven by a rotating motor in common which is operated, for example, with a nominal speed. In order to limit the total capacity to be delivered by the rotating motor to the two hydraulic pumps and thus protect the rotating motor from overload, the total capacity received by the hydraulic pumps must be limited. For this purpose it is known to control the hydraulic pumps driven jointly by the rotating motor so that each pump can receive a pre-set maximum capacity, such as 50% of the capacity of the rotating motor with nominal speed.

From DE 21 18 650 which is considered as the closest antecedent of the technology, a fixing drilling machine with a drive motor is known behind which a hydraulic pump assembly is connected which is composed of a distributor gear and at least Two hydraulic pumps A first pump supplies a rotating mechanism and a second pump supplies a percussion mechanism.

The USA 3,910,358 describes a drilling machine for underground drilling that uses two or more hydraulic motors to rotate and advance a drill, where the motors are supplied with hydraulic fluid from a single adjustable pump that is arranged in a remote location of The drilling machine.

As an objective of the invention, the specification of a drilling apparatus and a method of operating the drilling apparatus can be considered, which can be flexibly adapted to different types of operation.

The objective is achieved in accordance with the invention through a drilling apparatus with the characteristics of claim 1 and through a method with the characteristics of claim 12. Preferred embodiments are specified in the dependent claims.

The apparatus comprises an adjustment device for adjusting a distribution of the capacity of the rotating motor between the first hydraulic pump and the second hydraulic pump.

The procedure provides that different distributions of the capacity of the rotating motor are adjusted between the first hydraulic pump and the second hydraulic pump.

A basic idea of the invention can be seen in dividing the total capacity of the rotating motor flexibly between the hydraulic pumps. In this way, the first hydraulic pump can receive for example a maximum capacity of 60% and the second hydraulic pump a maximum capacity of 40% of the total capacity of the rotating motor. This distribution ratio can be changed by the adjustment device by an operator of the

variable drilling device, where the sum of the maximum capacities of the hydraulic pumps remains constant and can correspond in particular to the maximum capacity to be delivered by the rotating motor. With this, the capacity of the hydraulic pumps from the outside can be adapted to changes in operating conditions and the capacity of one of the pumps can be adjusted, for example, to a preset value.

The pump controls of the hydraulic pumps are preferably configured for the regulation of the capacity of the first hydraulic pump and the second hydraulic pump, respectively. The first hydraulic pump therefore preferably comprises a first capacity regulation device and the second hydraulic pump a second capacity regulation device with which the preset capacity of the pump can be adjusted or regulated. Therefore, hydraulic pumps can preferably be individually controlled by their respective pump control.

In a preferred embodiment of the invention it is provided that the first pump control has an adjustment device and the second pump control has a second adjustment device, that the first adjustment device is configured to adjust an extraction current of the first hydraulic pump depending on a working pressure in a pressure line of the first hydraulic pump and that the second adjustment device is configured to adjust an extraction current of the second hydraulic pump depending on a working pressure in a pressure line of The second hydraulic pump. The adjustment device may have an adjustment cylinder to adjust the hydraulic pump.

The adjustment devices are preferably made so that a capacity regulation is carried out along a hyperbolic capacity curve in a pressure-volume diagram which is also designated as a pump capacity diagram. For this purpose the pump extraction current is adjusted depending on the working pressure prevailing in the pump pressure line or a pressure difference between the pressure line and a suction line, so that the product of extraction current and pressure and thus the capacity of the pump.

Furthermore, according to the invention it is preferred that the first adjustment device can be controlled with a first adjustment pressure corresponding to the working pressure of the first hydraulic pump and that the second adjustment device can be controlled with a second pressure of adjustment corresponding to the working pressure of the second hydraulic pump. Through the adjustment pressure acting on the adjustment device, in particular on the adjustment cylinder, which corresponds to the pressure in the pressure line, the extraction current can be adjusted or regulated depending on the working pressure.

The distribution of the motor capacity among the hydraulic pumps is preferably provided by the first pump control having a first control device that can be controlled for capacity limitation and / or for increasing the capacity of the first hydraulic pump with a first control signal of the adjusting device and that the second pumping control has a second control device that can be controlled for capacity limitation and / or for increasing the capacity of the second hydraulic pump with a second control signal of the adjustment device.

The adjustment device is also preferably configured to provide in both pump controls, in particular at the same time, a control signal with which the capacity of each pump can be individually increased or decreased. By simultaneously providing control signals on both hydraulic pumps, a modification of the capacity of both pumps is achieved at the same time. The control signals preferably act in such a way that the capacity of one of the hydraulic pumps is increased and the capacity of the other hydraulic pump is decreased, in particular by the same amount.

According to the invention it is preferred that the control signals be electrical, hydraulic and / or pneumatic control signals. For example, the control signal may be an electrical signal that acts on an electromagnet or a control pressure that acts on a control piston.

With the use of hydraulic and / or pneumatic control signals it is preferred that the adjustment device is adapted to provide a first control pressure as the first control signal and a second control pressure as the second control signal. Furthermore, it is fundamentally possible that the control pressures have different magnitudes.

The adjustment device is preferably adapted to adjust the second control signal in a manner dependent on the first control signal. Through the control signals that depend on each other, it is possible to change the capacities of the hydraulic pumps in a pre-established reciprocal relationship.

It is further preferred that the adjustment device is adapted to provide control signals with the same magnitude but with a direction of action in the opposite direction in the first and second pump control. This makes it possible in a simple way to achieve with the control signals an increase in the capacity of the first hydraulic pump and a decrease in capacity by the same amount of the second hydraulic pump or vice versa.

In another preferred embodiment, the adjustment device is adapted to decrease the second control signal with

an increase in the first control signal and increase it with a decrease in the first control signal. For example, a defined and equal prior control signal can be provided on both control devices corresponding, for example, to a 50% to 50% capacity division. Through an increase in the first control signal and at the same time a decrease in the second control signal, this ratio can be changed to a pre-established ratio of for example 100% to 0%. Accordingly, the modification of the control signals is preferably performed in opposite directions, where more preferably the amount of the increase of a signal is equal to the amount of decrease of the second signal.

It is further preferred that the adjustment device is adapted to provide equal control signals in the first pump control and the second pump control, wherein the control signal in the first hydraulic pump acts in the direction of a decrease in capacity. of pumping, in particular of the extraction current, and in the second hydraulic pump in the sense of an increase in the pumping capacity, in particular of the extraction current, or vice versa. For this purpose, for example, a control pressure acting on both control devices can adjust the adjustment device in one of the control devices in a first direction and in the other control device in the opposite direction.

Comfortable control of the adjustment device can be achieved thanks to the adjustment device having a control element with which a rotational motor capacity distribution ratio between the first hydraulic pump and the second hydraulic pump can be adjusted, in particular manually and / or automatically. Therefore, the adjustment of the capacity of the hydraulic pumps can be done with a single control element or regulator. The control element makes it possible in a simple way to increase, for example, the capacity of a hydraulic pump, in the case of modified operating conditions, where it is ensured at the same time that the capacity of the other pump is decreased, so It avoids motor overload.

The control element may be a control element that can be manually operated by a user, for example a potentiometer. In addition, it is also possible to use an adjustment device that adjusts the pump capacities dependently on users connected to the pumps independently or automatically. For this purpose, a set of sensors that determine the quantity and / or capacity of consumers, in particular hydraulic drives, may be provided. These determined values can be provided by means of a data connection in the adjustment device. It is understood that the distribution ratio between hydraulic pumps can then be adjusted independently or automatically depending on the measured values.

The invention will be described below with reference to the attached schematic drawings,

in which:

Figure 1

shows a pump assembly of a drilling apparatus according to the invention,

Figure 2

shows an electrical regulation of the capacity of a hydraulic pump,

Figure 3

shows a hydraulic or pneumatic regulation of the capacity of a hydraulic pump,

Figure 4

shows a second hydraulic or pneumatic regulation and the capacity of a hydraulic pump, and

Figure 5

show diagrams  hydraulic pump capacity with different  terms from

Pump operation and a control element for capacity regulation.

The corresponding components between them are designated in all figures with the same reference numbers.

Figure 1 shows a set of pumps with a first pump unit 10 and a second pump unit 110 The first pump unit 10 comprises a first hydraulic pump 12 and the second pump unit 110 comprises a second hydraulic pump 112.

The hydraulic pumps 12, 112 are driven by a rotating motor 2 in common which has a rotating output shaft 4. The rotating motor 2 can be for example a diesel engine or an electric motor.

The hydraulic pumps 12, 112 are driven either directly or by means of a distributor gear of the output shaft 4 of the rotating motor 2. The hydraulic pumps 12, 112 have a first drive shaft 16 and a second drive shaft 116 which is coupled with the output shaft 4 of the rotating motor 2, or the pumps are mounted directly on a common shaft.

The hydraulic pump 12 of the first pump unit 10 is connected from the inlet side to a suction line 13 and from the outlet side to a pressure line 14. The hydraulic pump 112 of the second pump unit 110 is connected on the side of the inlet with a suction line 113 and on the side of the outlet with a suction line 114. The hydraulic drives 11, 111 are conductively communicated with the hydraulic pumps 12 and 112, respectively, and are actuated by means of a hydraulic fluid driven by the hydraulic pump 12. Between the hydraulic pumps 12, 112 and the hydraulic drives 11, 111, as illustrated, can

in each case an adjustment valve 17 and 117, respectively.

The pump units 10, 110 are comparable in terms of their structure, so that a description of a pump unit 10, 110 will first be carried out in general.

Exemplary embodiments of a pump unit 10, 110 are illustrated in Figures 2 to 4. A hydraulic pump 12, 112 and at least one additional hydraulic pump not illustrated are driven through a rotating motor 2. The hydraulic pump 12, 112 withdraws from a tank 39.

The pump unit 10, 110 comprises a pump control 18, 118 which can also be designated as a pump regulation, in particular capacity regulation, of the hydraulic pump 12, 112. With the pump control 18, 118 it is possible to adjust and adjust the received capacity to a preset maximum value, respectively. For this purpose, the amount of extraction of the hydraulic pump 12, 112 is adjusted depending on the pressure in the pressure line 14, 114.

The adjustment of the amount of extraction of the hydraulic pump 12, 112 which can be in particular an axial piston pump, is carried out by means of an adjustment device 19 in the form of an adjustment cylinder 20 that can be moved by a adjustment valve 30 in the direction of a minimum extraction volume (VS min) or the maximum extraction volume (VS max) per revolution. The adjustment valve 30 is conductively communicated on the side of the inlet on one side by means of a connection channel 37 with the pressure line 14, 114 and on the other hand by means of a tank channel 38 with the tank 39.

The adjusting cylinder 20 comprises a cylinder housing 21 in which an adjusting piston 24 which can be moved longitudinally is arranged. The adjusting piston 24 acts by means of a piston rod 29 fixed thereon on an adjustment element of a hydraulic pump 12, 112 with which the extraction volume of the hydraulic pump 12 can be adjusted.

The adjusting piston 24 has a first piston surface 25 and a second piston surface 26 that are oriented in the opposite direction with respect to each other. The first piston surface 25 limits a first pressure chamber 22 and the second piston surface 26 limits a second pressure chamber 23 of the adjustment cylinder 20. The first pressure chamber 22 is conductively communicated by means of a first communication channel 27 and the second pressure chamber 23 by means of a second communication channel 28 with the adjustment valve 30.

The hydraulic capacity (P) of the hydraulic pump 12 results from the pumping pressure (p) existing in the pressure line 14, 114 and a pressure difference, respectively, between the pressure line 14, 114 and the suction line 13, 113 multiplied by the volume flow (Q) of the pump. When a pump must take a constant capacity, a hyperbolic path of the curve in a pump capacity diagram results from the condition P = p * Q = constant as illustrated in Figure 5. This so-called capacity hyperbola is limited on the ordinate through the maximum permissible pressure pmáx and on the abscissa through the maximum volume current Qmax resulting from the nominal speed of the drive motor or rotating motor 2, respectively, multiplied by the maximum extraction volume by revolution.

Hyperbolic behavior is achieved through a lever mechanism 50. The lever mechanism 50 has a lever 52 which is rotatably mounted around a rotating shaft 51 and comprising a first lever arm 53 and a second lever arm 54

Moments 52 rotate to the left and to the right on the lever 52. In the arrangement illustrated in Figures 2 to 4, the moments of rotation to the left result from a spring force FF of the adjusting valve 30 multiplied by a lever arm representing a distance between the point of attack of the spring force FF on the second lever arm 54 and the rotating shaft 51. A pressure spring 31 is applied to the adjustment valve 30 which moves the valve 30 in the embodiment illustrated to the left.

A hydraulic cylinder 40 is mounted on the piston rod 29 of the adjusting piston 24 which moves along with the adjusting piston 24 along a lever arm b and to which the pumping pressure pP existing in the power line is applied. pressure 14, 114. The hydraulic cylinder 40 has for this purpose a cylinder housing 41 with an adjustment piston 42 guided therein in a longitudinally movable manner. The adjustment piston 42 acts by means of a piston rod 43 on the first lever arm 53. A pressure chamber 44 limited by a piston surface 46 of the adjustment piston 42 is conductively communicated by means of a control channel 34 with the pressure line 14, 114 of the hydraulic pump 12, 112.

The lever arm b results from a distance between the point of attack of the hydraulic cylinder 40 on the first lever arm 53 and the rotary axis 51 of the lever mechanism 50. From the pumping pressure pP multiplied by the surface of piston 46 of hydraulic cylinder 40 results in a force Fp. This force multiplied by the lever arm b - which with a constant number of revolutions is proportional to the volume current Q - results in the right-hand rotation moments of the lever mechanism 50. This results in an equilibrium condition. : FF * a = Fp * b.

While FF * a is greater than Fp * b, the adjustment cylinder 20 moves in the direction of the maximum extraction volume Vs max. As soon as FF * a is less than Fp * b, the adjustment valve 30 moves against the pressure spring 31 to the right and moves the adjustment cylinder 20 in the direction of the minimum extraction volume VS min. The adjustment valve 30 is made as a proportional valve, so that in FF * a = Fp * b it is in a regulating position. With a small lever arm b, which corresponds to a small amount of extraction, a high force Fp and thus a high pumping pressure pP are required to return the pump. Increasing the amount of extraction increases the lever arm b and the regulation is already carried out with a reduced pumping pressure pP, thereby generating the hyperbolic shape of the capacity curve.

The pumping control 18, 118 has a control device 60 for increasing the capacity or decreasing the capacity of the hydraulic pump 12, 112. The control device 60 is configured to adjust the capacity curve of the hydraulic pump 12, 112 by means of a ps control signal and to adapt it to the different operating conditions, respectively. Therefore, it is possible to shift the capacity hyperbola to higher or lower capacities.

Figure 2 shows an embodiment of the pump control 18, 118 with an electrical control device 60 by which the capacity of the hydraulic pump 12, 112 can be adjusted by means of an electrical control signal pS. The control device 60 for this purpose may in particular have an electromagnet.

Figures 3 and 4 show an embodiment of the pump control 18 with a hydraulic control device 60. At the same time, the adjustment of the capacity curve is carried out by means of a hydraulic or pneumatic control cylinder 62. The cylinder Control 62 comprises a cylinder housing 64 in which an adjustment piston 66 is mounted which can be moved longitudinally. The control pressure ps acts here on a control surface 67 and 68, respectively, of the adjustment piston 66.

In the embodiment according to Figure 3, the control device 60 generates an additional force FS that acts in the opposite direction to the spring force FF and changes the equilibrium condition for FF * a = Fp * b + FS * and (FF - FS) * a - Fp * b, respectively. This moves the hyperbola in the capacity diagram to the left, which corresponds to a smaller capacity P. The maximum pressure pmmax and the maximum extraction quantity Qmax are preferably kept the same here. The capacity of the hydraulic pump 12, 112 is reduced through an application or an increase in the control pressure ps.

Figure 4 shows a kinematic inversion, where the force FS does not act in the opposite direction, but in the direction of the spring force FF, increasing it and thus displacing the capacity hyperbola in the capacity diagram towards larger capacities. The capacity of the hydraulic pump 12, 112 is increased through an application or an increase in the control pressure ps.

The second pump unit 110 with the second hydraulic pump 112 may be constructed correspondingly or equal to the first pump unit 10 with the first hydraulic pump 12.

An adjustment device 6 for the distribution of the motor capacity over the hydraulic pumps 12, 112 is configured to provide at the same time in the first pump control 18 a first control signal and in the second pump control 118 a second signal of control.

In a preferred embodiment of the invention, the pump control 18 of the first hydraulic pump 12 is carried out, for example, in the manner shown in Figure 3 and the pump control of the second hydraulic pump 112 in the manner that shown in Figure 4. Through this, the capacity of the first hydraulic pump 12 can be reduced through a control pressure ps acting on both pump controls 12, 112, in particular in the same manner, and increase at the same time the capacity of the second hydraulic pump 112 by a corresponding amount, so that the total capacity remains the same. Therefore, it is possible to achieve variable distributions of the motor capacity over the hydraulic pumps 12, 112 thanks to the fact that the adjustment device 6 provides equal control signals, in particular pS control pressures, in both pump controls 18, 118 .

Figure 5 shows three different operating conditions of the hydraulic pumps 12, 112. The capacity diagrams on the left side show the respective capacity curves of the first hydraulic pump 12 and the capacity diagrams on the right side show the respective capacity curves of the second hydraulic pump 112. The two lower capacity curves show an initial condition in which the two hydraulic pumps 12, 112 receive 50% of the total PM capacity of the rotating motor 2.

Through the adjusting device 6, the distribution of the total capacity in the two hydraulic pumps 12, 112 can be changed. The two upper capacity diagrams show for example a condition in which the capacity of the first hydraulic pump 12 is decreased by a defined amount and the capacity of the second hydraulic pump 112 is increased by a corresponding amount. In the central area of the figure an inverse situation is shown in which the capacity of the first hydraulic pump 12 is increased by a defined amount and the capacity of the second hydraulic pump 112 is decreased by a corresponding amount.

For the distribution of the capacity of the rotating motor 2 on the hydraulic pumps 12, 112, a control element 70 is provided with a rotating lever or a rotating button, for example. The control element 70 is configured to adapt at the same time the pumping capacity of the two hydraulic pumps 12, 112. For this purpose it may be possible to adjust the capacity of each pump between 0% and 100% of the capacity of the rotating motor 2 and thus dividing the available capacity of the motor in a flexible manner on the hydraulic pumps 12, 112. The control apparatus 70 may in particular be a potentiometer.

Claims (12)

1. A drilling device for underground drilling with:

-

 at least a first hydraulic drive (11) and at least a second hydraulic drive (111),

-

 at least a first hydraulic pump (12) and at least a second hydraulic pump (112) that are conductively communicated for the transmission of energy by means of a hydraulic fluid with the first hydraulic drive (11) and the second hydraulic drive (111) , Y

-

 a rotating motor (2) with an output shaft (4) to which a torque is applied for the emission of a preset motor capacity, through which the first hydraulic pump (12) and the second hydraulic pump are driven (112), wherein the capacity of the rotating motor (2) is distributed between the first hydraulic pump (12) and the second hydraulic pump (112), characterized in that

-

 a first pumping control (18) and a second pumping control (118) are provided for the control of the pumping capacity to be delivered by the first hydraulic pump (12) and the second hydraulic pump (112), respectively ,

-

 an adjustment device (6) is provided for the adjustment of different distributions of the capacity of the rotating motor (2) between the first hydraulic pump (12) and the second hydraulic pump (112), and

-

 The adjustment device (6) has a control element (70) with which a rotational motor capacity distribution ratio (2) can be adjusted between the first hydraulic pump (12) and the second hydraulic pump (112) .

2.

 A drilling apparatus according to claim 1, characterized in that the pumping controls (18, 118) of the hydraulic pumps (12, 112) are configured to regulate the capacity of the first hydraulic pump (12) and the second hydraulic pump (112).

3.

 A drilling apparatus according to claim 1 or 2, characterized in that

-

 the first pump control (18) has an adjustment device (19) and the second pump control (118) has a second adjustment device (119),

-

 the first adjustment device (19) is configured to adjust a first extraction current of the first hydraulic pump (12) depending on a working pressure in a pressure line (14) of the first hydraulic pump (18) and

-

 The second adjustment device (119) is configured to adjust an extraction current of the second hydraulic pump (112) depending on a working pressure in a pressure line (114) of the second hydraulic pump (112).

4. A drilling apparatus according to claim 3, characterized in that

-

 a first adjustment pressure corresponding to the working pressure of the first hydraulic pump (12) can be applied to the first adjustment device (19) and

-

 A second adjustment pressure corresponding to the working pressure of the second hydraulic pump (112) can be applied to the second adjustment device (19).

5. A drilling apparatus according to one of claims 1 to 4, characterized in that

-

 The first pump control (18) has a first control device (60) to which for the capacity limitation and / or for the increase of the capacity of the first hydraulic pump (12) a first control signal can be applied of the adjusting device (6) and

-

 The second pump control (118) has a second control device (160) to which a second control signal can be applied to the capacity limitation and / or to increase the capacity of the second hydraulic pump (112). of the adjustment device (6).

6.

 A drilling apparatus according to claim 5, characterized in that the control signals are electrical, hydraulic and / or pneumatic control signals.

7.

 A drilling apparatus according to claim 5 or 6, characterized in that the adjustment device

(6) is configured to provide a first control pressure as a first control signal and a second control pressure as a second control signal.

8.

 A drilling apparatus according to one of claims 5 to 7, characterized in that the adjustment device (6) is configured to adjust the second control signal depending on the first control signal.

9.

 A drilling apparatus according to claim 8, characterized in that the adjustment device (6) is configured to provide control signals of the same magnitude in the first and second pumping control (18, 118), but with a direction of action in the opposite direction.

10.

 A drilling apparatus according to one of claims 5 to 9, characterized in that the device

setting (6) is configured to decrease the second control signal in case of an increase in the first control signal and to increase it in case of a decrease in the first control signal.

eleven.

 A drilling apparatus according to one of claims 5 to 10, characterized in that the adjustment device (6) is configured to provide control signals equal to the first pumping control (18) and

5 to the second pump control (118), wherein the control signal acts on the first hydraulic pump (12) in the direction of a decrease in pumping capacity and on the second hydraulic pump (112) in the direction of a increased pumping capacity or vice versa. 12. A method for the operation of a drilling apparatus for drilling the subsoil, in particular according to one of claims 1 to 11, wherein 10 - at least a first hydraulic drive (11) and at least a second hydraulic drive (111) are operated,

-

 The first hydraulic drive (11) is supplied with hydraulic fluid by means of a first hydraulic pump (12) that is conductively communicated with the first hydraulic drive (11) and the second hydraulic drive (111) is supplied with hydraulic fluid by a second pump

15 hydraulic (112) which is conductively communicated with the second hydraulic drive (111),

-

 the hydraulic pumps (18, 118) are driven by a rotating motor in common (2) and

-

 a capacity of the rotating motor (2) is distributed between the first hydraulic pump (12) and the second hydraulic pump (112), characterized in that

-

 a pumping capacity is controlled that must be delivered by the first hydraulic pump (12)

20 by a first pumping control (18) and a pumping capacity to be delivered by the second hydraulic pump (112) by a second pumping control (118) and

-

 for the variable distribution of the capacity of the rotating motor (2) a relationship of distribution of the capacity of the motor between the first hydraulic pump (12) and the second hydraulic pump (112) is set with a control element (70).