CN102337845B

CN102337845B - Protection method for rotary drilling rig, controller, protection device and rotary drilling rig

Info

Publication number: CN102337845B
Application number: CN 201110271829
Authority: CN
Inventors: 李昱; 费胜巍; 吴耀华; 张刊; 苏超
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2011-09-14
Filing date: 2011-09-14
Publication date: 2013-03-27
Anticipated expiration: 2031-09-14
Also published as: CN102337845A

Abstract

The invention discloses a protection method for a rotary drilling rig. The rotary drilling rig comprises a drilling stem (5) and a main pump (1) used for driving the drilling stem (5) to rotate. The protection method comprises: detecting the depth of the drilling stem (5) and the first output pressure of the main pump (1); and determining the first upper limit according to the value of depth, comparing the value of the first output pressure and the first upper limit, and when the value of the first output pressure is larger than the first upper limit, reducing the first output pressure of the main pump (1). The invention also provides a controller for realization of the protection method, a protection system and the rotary drilling rig. By adopting the technical scheme, detection and feedback of the pressure output by the main pump are achieved, and when the actual torque born by the drilling stem is larger than the maximum torque the drilling stem can bear, the output of the main pump can be reduced, the actual torque can be lowered, and the deformation of the drilling stem can be avoided.

Description

The guard method and controller, protective device and the rotary drilling rig that are used for rotary drilling rig

Technical field

The present invention relates to a kind of guard method for rotary drilling rig and controller, protective device and rotary drilling rig, particularly, relate to a kind of guard method, controller, protective device and rotary drilling rig that the drilling rod of rotary drilling rig is protected.

Background technology

Most of power of rotary drilling rig is provided by main pump, and main pump is to pressurization oil cylinder output pressure, and by the pressurization oil cylinder drilling rod is controlled, and the pressurization oil cylinder produces pressure to drilling rod.

When rotary drilling rig is constructed, need at first adjust the direction of drill bit and pierce direction, pierce the increase of the degree of depth along with boring, drilling rod is elongated gradually, the pressure that causes bearing on the one hand diminishes gradually, when drill bit runs into larger resistance, must carry out instantaneous pressurization to drilling rod by the pressurization oil cylinder, with the layer that breaks down all resistance, when pressure that the pressure of instantaneous pressurization can bear greater than drilling rod, distortion will appear in drilling rod, affect normal construction, in addition, when instantaneous pressurization is carried out in pressurization oil cylinder acquisition instruction, equipment causes the chassis angle change to the ground compacting after the long working, causes a reference value of bit drills Inbound deviation to occur, owing to the deviation that tilts to cause drilling rod and hole perpendicularity to produce can affect drilling quality; The gradually elongated meeting of drilling rod causes its moment of torsion that can bear to diminish gradually on the other hand, and during peak torque that the actual torque that bears when drilling rod can bear greater than drilling rod, drilling rod will deform, and affect normal construction.

In the contingent above-mentioned fault of drilling rod, the situation that drilling rod deforms owing to the peak torque that can bear diminishes is the most common.Prior art lacks effective safeguard measure and the device for the contingent above-mentioned fault of drilling rod.

Summary of the invention

The purpose of this invention is to provide a kind of guard method for rotary drilling rig, this guard method can prevent that drilling rod from deforming owing to bearing excessive torque.

To achieve these goals, the invention provides a kind of guard method of rotary drilling rig, described rotary drilling rig comprises drilling rod and be used for to drive the main pump that this drilling rod rotates that wherein, described guard method comprises: the value that detects the first output pressure of the value of the degree of depth of described drilling rod and described main pump; Determine the first higher limit according to the value of the described degree of depth, value and described first higher limit of described the first output pressure compared, when the value of described the first output pressure during greater than described the first higher limit, reduce the first output pressure of described main pump.

In addition, another object of the present invention provides a kind of controller for the protection of rotary drilling rig, thereby this controller can be realized above-mentioned guard method protection drilling rod.

To achieve these goals; the present invention also provides a kind of controller for the protection of rotary drilling rig; described rotary drilling rig comprises drilling rod and is used for driving the main pump that this drilling rod rotates; described controller comprises the first controller of adjusting for to the first output pressure of described main pump; this first controller comprises the first input module, the first processing module and the first control module that connects successively; wherein

Described the first input module is used for receiving the value of the first output pressure of the value of the degree of depth of described drilling rod and described main pump, and the value of the first output pressure of the value of the degree of depth of described drilling rod and described main pump is sent to described the first processing module;

Described the first processing module is used for determining the first higher limit, the value of described the first output pressure and described the first higher limit are compared and comparative result being sent to described the first control module according to the value of the described degree of depth;

It is in the situation of value greater than described the first higher limit of described the first output pressure that described the first control module is used at comparative result, reduces the first output pressure of described main pump.

In addition, another object of the present invention provides a kind of protective device for rotary drilling rig, and this protective device is realized the mistake of drilling rod is turned round protection by above-mentioned controller of the present invention.

To achieve these goals; the present invention also provides a kind of protective device for rotary drilling rig; described rotary drilling rig comprises drilling rod and is used for driving the main pump that this drilling rod rotates; wherein; described protective device comprises the depth sensor for detection of the value of the degree of depth of described drilling rod; for detection of the first sensor of the value of the first output pressure of described main pump be used for the first controller that the first output pressure of described main pump is adjusted; this first controller comprises the first input module that connects successively; the first processing module and the first control module; wherein

Described depth sensor be connected first sensor and be connected with described the first input module, described the first input module is used for and will be sent to described the first processing module from the value of the degree of depth of the described drilling rod of described depth sensor with from the value of the first output pressure of the described main pump of described first sensor;

In addition, the present invention also provides a kind of rotary drilling rig, and this rotary drilling rig comprises protective device of the present invention.

By technique scheme, detect and feed back by the force value to main pump output, reduce the output of main pump during peak torque that the actual torque that bears when drilling rod can bear greater than it, reduce actual torque, thereby prevent the drilling rod distortion.

Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.

Description of drawings

Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of manual, is used from explanation the present invention with the following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of the preferred embodiment of protective device of the present invention;

Fig. 2 is that the preferred embodiment of protective device of the present invention is crossed the schematic diagram of turning round protection to drilling rod;

Fig. 3 is that the preferred embodiment of protective device of the present invention is to the schematic diagram of drilling rod overvoltage protection;

Fig. 4 is that the preferred embodiment of protective device of the present invention is crossed the schematic diagram of the protection of inclining to drilling rod;

Fig. 5 is the schematic diagram of the preferred embodiment of guard method of the present invention.

Description of reference numerals

1 main pump, 2 pressurization oil cylinders

3 add pressure electromagnetic valve 4 chassis

5 drilling rods, 11 first sensors

12 second sensors 13 the 3rd sensor

21 first controllers, 22 second controllers

23 the 3rd controllers

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.Should be understood that the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.

The invention provides a kind of guard method for rotary drilling rig, described rotary drilling rig comprises drilling rod 5 and is used for driving the main pump 1 that this drilling rod 5 rotates that wherein, described guard method comprises:

Detect the value of the first output pressure of the value of the degree of depth of described drilling rod 5 and described main pump 1;

Determine the first higher limit according to the value of the described degree of depth, value and described first higher limit of described the first output pressure compared, when the value of described the first output pressure during greater than described the first higher limit, reduce the first output pressure of described main pump 1.

Be illustrated in figure 5 as the preferred embodiment schematic diagram of guard method of the present invention; in rotary drilling rig; main pump 1 is used for providing the drilling rod power that 5 rotations pierce; so the moment of torsion that drilling rod bears is relevant with the first output pressure of main pump 1; if and the moment of torsion that drilling rod bears is greater than its peak torque that can bear; drilling rod will deform, thereby affects the normal operation of drilling rod.The drilling rod that prevents rotary drilling rig provided by the invention cross the guard method of turning round be exactly the monitoring drilling rod current pierce the first current output pressure of the degree of depth and main pump 1; Depth determination the first higher limit according to drilling rod; the first output pressure and this first higher limit with main pump 1 compares again, thereby the first output pressure of main pump 1 is carried out feedback regulation.

Preferably, the value of the peak torque that under the described degree of depth, can bear of the corresponding described drilling rod 5 of described the first higher limit.

Along with drilling rod pierces the increase of the degree of depth, the peak torque that drilling rod can bear constantly reduces, and this first higher limit is determined according to the peak torque that drilling rod can bear under the current degree of depth.That is to say that this first higher limit is that the degree of depth that pierces with drilling rod is corresponding, each depth value corresponding first higher limit, perhaps a certain section depth value correspondence first higher limit.

Need to prove that the first higher limit that should be corresponding with the degree of depth can obtain by test and/or empirical value.For example, test detection for rotary drilling rig and/or the drilling rod of certain model, and with the experience of measuring or to the experience of mechanical performance measurement result is revised, thereby make the first higher limit can play the effect that the protection drilling rod can not occur to turn round.Usually this first higher limit can be slightly less than the peak torque that drilling rod can bear under the current degree of depth.

Preferably, described guard method also comprises:

Determine the first lower limit according to the value of the described degree of depth, value and described first lower limit of described the first output pressure compared, when the value of described the first output pressure during less than described the first lower limit, improve the output pressure of described main pump 1.

With above-mentioned the first higher limit in the same manner, the first lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if the first output pressure of main pump 1 is owing to being lowered greater than the first higher limit, at this moment the moment of torsion that bears of drilling rod will diminish, therefore but the first output pressure of main pump 1 is reduced to the normal operation that to a certain degree will affect drilling rod, first lower limit will be set the first output pressure of main pump 1 is monitored.The output that will suitably increase main pump 1 during less than this first lower limit when the first output pressure value of main pump 1.

Preferably, the value of the corresponding described drilling rod 5 of described the first lower limit minimal torque that under the described degree of depth, can work.

The acquisition of the acquisition of this first lower limit and the first higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.

Preferably, described rotary drilling rig comprises that described guard method also comprises by adding the pressurization oil cylinder 2 of 3 pairs of described drilling rod 5 pressurizations of pressure electromagnetic valve:

Detect the value of the second output pressure of described pressurization oil cylinder 2;

Determine the second higher limit according to the value of the described degree of depth, value and described second higher limit of described the second output pressure compared, when the value of described the second output pressure during greater than described the second higher limit, make described pressure electromagnetic valve 3 cut-offs that add.

In the course of work of rotary drilling rig, drilling rod not only bears moment of torsion owing to self rotating, and also can constantly pierce downwards because of the effect that is under pressure.Therefore, drilling rod is not only provided the power of rotation by main pump 1, the downward power that the oil cylinder 2 that also is subject to pressurizeing provides.Along with the elongation of drilling rod, the maximum pressure that drilling rod can bear also reduces gradually, if the maximum pressure that drilling rod can bear under the current degree of depth greater than drilling rod at the actual pressure that bears under the current degree of depth, drilling rod will deform.The present invention prevents that by the monitoring of the second output pressure to pressurization oil cylinder 2 drilling rod from above-mentioned overvoltage fault occuring.

The second output pressure of monitoring pressure oil cylinder 2 of the present invention, when this second output pressure greater than by the second higher limit of Depth determination the time, adding pressure electromagnetic valve 3 will end, 3 pairs of drilling rods 5 of pressure electromagnetic valve pressurize and pressurization oil cylinder 2 adds by this just.So, pressurization oil cylinder 2 will stop drilling rod 5 pressurizations, thereby prevents that drilling rod 5 is owing to overvoltage deforms.

Preferably, the value of the maximum pressure that under the described degree of depth, can bear of the corresponding described drilling rod 5 of described the second higher limit.

Along with drilling rod pierces the increase of the degree of depth, the maximum pressure that drilling rod can bear constantly reduces, and this second higher limit is determined according to the maximum pressure that drilling rod can bear under the current degree of depth.That is to say that this second higher limit is that the degree of depth that pierces with drilling rod is corresponding, each depth value corresponding second higher limit, perhaps a certain section depth value correspondence second higher limit.

Need to prove that the second higher limit that should be corresponding with the degree of depth can obtain by test and/or empirical value.For example, test detection for rotary drilling rig and/or the drilling rod of certain model, and with the experience of measuring or to the experience of mechanical performance measurement result is revised, thereby make the second higher limit can play the effect that overvoltage can not occur the protection drilling rod.Usually this second higher limit can be slightly less than the value of the maximum pressure that drilling rod can bear under the current degree of depth.

Preferably, described guard method also comprises:

According to described Depth determination the second lower limit, value and described second lower limit of described the second output pressure compared, when the value of described the second output pressure during less than described the second lower limit, make described pressure electromagnetic valve 3 conductings that add.

With above-mentioned the second higher limit in the same manner, the second lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if add pressure electromagnetic valve 3 owing to the pressurization oil cylinder 2 the second output pressure be cut off greater than the second higher limit, at this moment drilling rod no longer bears the second output pressure of pressurization oil cylinder 2, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore second lower limit will be set the second output pressure of pressurization oil cylinder 2 is monitored.When will suitably making during less than this second lower limit, the second output pressure value of pressurization oil cylinder 2 adds pressure electromagnetic valve 3 conductings.

Preferably, the value of the corresponding described drilling rod 5 of described the second lower limit minimum pressure that under the described degree of depth, can work.

The acquisition of the acquisition of this second lower limit and the second higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.

Detect the value at inclination angle on the chassis 4 of described rotary drilling rig;

Value and the 3rd higher limit at described inclination angle are compared, when the value at described inclination angle during greater than described the 3rd higher limit, make described pressure electromagnetic valve 3 cut-offs that add.

In 5 pressurizations of 2 pairs of drilling rods of pressurization oil cylinder, also have reaction force acts on the chassis 4 of rotary drilling rig, thereby cause chassis 4 to tilt.A corresponding relation is arranged between the verticality of the inclination angle on chassis 4 and drilling rod 5, because unnecessary inclination occurs on chassis 4, will cause the variation of the verticality of drilling rod 5, this can affect drilling quality eventually, even drilling rod is damaged.

Therefore, the invention provides the inclination angle that above-mentioned method is used for monitoring chassis 4, when the inclination angle on chassis 4 adds pressure electromagnetic valve 3 cut-offs during greater than the 3rd higher limit, the oil cylinder 2 that namely pressurizes no longer pressurizes to drilling rod, does not also just have reaction force acts and 4 causes the inclination angle on chassis 4 further to enlarge on the chassis.

Preferably, but the value of the verticality of the corresponding described drilling rod 5 of described the 3rd higher limit inclination maximum on corresponding described chassis 4 in tolerance range the time, under the second output pressure of pressurization oil cylinder 2.

Because the inclination angle on chassis 4 can affect the verticality of drilling rod 5, but so the 3rd higher limit when the verticality of described drilling rod 5 is in tolerance range, the inclination maximum on the described chassis 4 under the second output pressure of corresponding pressurization oil cylinder 2 is determined.

Need to prove that the 3rd limit value can obtain by test and/or empirical value.For example; rotary drilling rig and/or drilling rod for certain model are tested detection; and with the experience of measuring or to the experience of mechanical performance measurement result is revised, thereby made the 3rd higher limit can play the effect of verticality in tolerance interval of protection drilling rod.But common the 3rd higher limit verticality in tolerance range time that can be slightly less than drilling rod 5, the inclination maximum on the described chassis 4 under the second output pressure of corresponding pressurization oil cylinder 2.

Preferably, described guard method also comprises:

Value and the 3rd lower limit at described inclination angle are compared, when the value at described inclination angle during less than described the 3rd lower limit, make described pressure electromagnetic valve 3 conductings that add.

With above-mentioned the 3rd higher limit in the same manner, the 3rd lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if adding pressure electromagnetic valve 3 is cut off greater than the 3rd higher limit owing to the value at inclination angle, at this moment drilling rod 5 no longer bears the second output pressure of pressurization oil cylinder 2, chassis 4 can not born the reaction force of the second output pressure of pressurization oil cylinder 2 more yet, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore the 3rd lower limit will be set the inclination angle on chassis 4 is monitored.Add pressure electromagnetic valve 3 conductings when the inclination angle on chassis 4 value will suitably make during less than the 3rd lower limit, thereby make drilling rod 5 normal operations.

The value of the minimum angle-of-incidence on corresponding chassis 4 when preferably, the corresponding described drilling rod 5 of described the 3rd lower limit can work, under the second output pressure of described pressurization oil cylinder 2.

The acquisition of the acquisition of the 3rd lower limit and the 3rd higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.

Need to prove; above-mentioned various preferred embodiments of the present invention can at random make up; that is to say that any one that can provide the drilling rod of rotary drilling rig in moment of torsion, pressure and the verticality, two or three monitor, thereby according to actual needs drilling rod is monitored and protected.

In addition; the present invention also provides a kind of controller for the protection of rotary drilling rig; described rotary drilling rig comprises drilling rod 5 and is used for driving the main pump 1 that this drilling rod 5 rotates; described controller comprises for the first controller 21 that the first output pressure of described main pump 1 is adjusted; this first controller 21 comprises the first input module, the first processing module and the first control module that connects successively; wherein

Described the first input module is used for receiving the value of the first output pressure of the value of the degree of depth of described drilling rod 5 and described main pump 1, and the value of the first output pressure of the value of the degree of depth of described drilling rod 5 and described main pump 1 is sent to described the first processing module;

It is in the situation of value greater than described the first higher limit of described the first output pressure that described the first control module is used at comparative result, reduces the first output pressure of described main pump 1.

Controller of the present invention is used for realizing above-mentioned guard method of the present invention.

In rotary drilling rig, main pump 1 is used for providing the drilling rod power that 5 rotations pierce, so the moment of torsion that drilling rod bears is relevant with the first output pressure of main pump 1, and if the moment of torsion that drilling rod bears greater than its peak torque that can bear, drilling rod will deform, thereby affects the normal operation of drilling rod.The first controller 21 provided by the invention is used for monitoring drilling rod whether phenomenon occured to turn round, wherein, common and the sensor interface of the first input module, be used for to receive the value of the first output pressure of the value of the degree of depth of the drilling rod 5 that is detected by sensor and main pump 1, the first processing module is processed above-mentioned data in inside, be used for determining the first higher limit according to the depth value that receives, value and first higher limit of the first output pressure are compared, and comparative result is sent to the first control module, in the situation of value greater than the first higher limit of the first output pressure, the first control module is for reducing the first output pressure of main pump 1.

The definite of described the first higher limit above introducing, and repeats no more herein.

Preferably, described the first processing module also is used for determining the first lower limit, the value of described the first output pressure and described the first lower limit are compared and comparative result being sent to the first control module according to the value of the described degree of depth;

It is in the situation of value less than described the first lower limit of described the first output pressure that described the first control module is used at comparative result, improves the output pressure of described main pump 1.

With above-mentioned the first higher limit in the same manner, the first lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if the first output pressure of main pump 1 is owing to being lowered greater than the first higher limit, at this moment the moment of torsion that bears of drilling rod will diminish, therefore but the first output pressure of main pump 1 is reduced to the normal operation that to a certain degree will affect drilling rod, first lower limit will be set the first output pressure of main pump 1 is monitored.The output that will suitably increase main pump 1 during less than this first lower limit when the first output pressure value of main pump 1.Particularly, when the first processing module compares the value of the first output pressure and the first lower limit and comparative result is sent to the first control module, when the value of the first output pressure during less than the first lower limit, the first control module improves the first output pressure of main pump 1.Wherein, the acquisition of the acquisition of the first lower limit and the first higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.

Preferably, described the first controller 21 is PLC equipment.PCL equipment is easy to use, and cost is lower, and can satisfy the requirement of controller of the present invention, therefore uses PLC equipment in the preferred embodiment of the present invention.

Preferably, described rotary drilling rig also comprises by adding the pressurization oil cylinder 2 of 3 pairs of described drilling rod 5 pressurizations of pressure electromagnetic valve, described controller also comprises be used to controlling the described second controller that adds pressure electromagnetic valve 3 conductings or cut-off, described second controller comprises the second input module, the second processing module and the second control module that connects successively, wherein

Described the second input module is used for receiving the value of the second output pressure of the value of the degree of depth of described drilling rod 5 and described pressurization oil cylinder 2, and the value of the second output pressure of the value of the degree of depth of described drilling rod 5 and described pressurization oil cylinder 2 is sent to the second processing module;

Described the second processing module is used for determining corresponding default the second higher limit, the value of described the second output pressure and described the second higher limit are compared and comparative result being sent to the second control module according to the value of the described degree of depth;

It is in the situation of value greater than described the second higher limit of described the second output pressure that described the second control module is used at comparative result, makes described pressure electromagnetic valve 3 cut-offs that add.

In the course of work of rotary drilling rig, drilling rod not only bears moment of torsion owing to self rotating, and also can constantly pierce downwards because of the effect that is under pressure.Therefore, drilling rod is not only provided the power of rotation by main pump 1, the downward power that the oil cylinder 2 that also is subject to pressurizeing provides.Along with the elongation of drilling rod, the maximum pressure that drilling rod can bear also reduces gradually, if the maximum pressure that drilling rod can bear under the current degree of depth greater than drilling rod at the actual pressure that bears under the current degree of depth, drilling rod will deform.Controller of the present invention comprises that also second controller 22 prevents that by the monitoring of the second output pressure to pressurization oil cylinder 2 drilling rod from above-mentioned overvoltage fault occuring.

Common and the sensor interface of the first input module, thereby receive the degree of depth of drilling rod 5 and the second output pressure of pressurization oil cylinder 2, the second processing module is determined the second higher limit, the value of the second output pressure and the second higher limit are compared and comparative result is sent to the second control module according to the depth value of drilling rod 5, the value of judging the second output pressure when the second processing module is during greater than the second higher limit, and the control of the second control module adds pressure electromagnetic valve 3 cut-offs.

Preferably, described the second processing module can also be used for determining corresponding default the second lower limit, value and described second lower limit of described the second output pressure being compared according to the value of the described degree of depth, and comparative result is sent to described the second control module;

It is in the situation of value less than described the second higher limit of described the second output pressure that described the second control module is used at comparative result, makes described pressure electromagnetic valve 3 conductings that add.

With above-mentioned the second higher limit in the same manner, the second lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if add pressure electromagnetic valve 3 owing to the pressurization oil cylinder 2 the second output pressure be cut off greater than the second higher limit, at this moment drilling rod no longer bears the second output pressure of pressurization oil cylinder 2, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore second lower limit will be set the second output pressure of pressurization oil cylinder 2 is monitored.When value and described second lower limit of the second processing module with described the second output pressure compares, and the second output pressure value of judging pressurization oil cylinder 2 is during less than this second lower limit, and the second control module makes and adds pressure electromagnetic valve 3 conductings.Wherein, the acquisition of the acquisition of the second lower limit and the second higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.

Preferably, described second controller 22 is PLC equipment.PCL equipment is easy to use, and cost is lower, and can satisfy the requirement of controller of the present invention, therefore uses PLC equipment in the preferred embodiment of the present invention.

Preferably, described rotary drilling rig also comprises by adding the pressurization oil cylinder 2 of 3 pairs of described drilling rod 5 pressurizations of pressure electromagnetic valve, described controller also comprises be used to controlling described the 3rd controller that adds pressure electromagnetic valve 3 conductings or cut-off, described the 3rd controller comprises the 3rd input module, the 3rd processing module and the 3rd control module that connects successively

Described the 3rd input module be used for to receive the value at the inclination angle on chassis 4, and the value at the inclination angle on this chassis 4 is sent to described the 3rd processing module;

Described the 3rd processing module is used for value and described the 3rd higher limit at described angle are compared, and comparative result is sent to described the 3rd control module;

Described the 3rd control module is used in the situation of the value that relatively is combined into described inclination angle greater than described the 3rd higher limit, makes described pressure electromagnetic valve 3 cut-offs that add.

Therefore, the 3rd controller provided by the invention is monitored the inclination angle on chassis 4, when the inclination angle on chassis 4 adds pressure electromagnetic valve 3 cut-offs during greater than the 3rd higher limit, the oil cylinder 2 that namely pressurizes no longer pressurizes to drilling rod, does not also just have reaction force acts and 4 causes the inclination angle on chassis 4 further to enlarge on the chassis.

In the preferred embodiment provided by the invention, the 3rd controller 23 is used for monitoring the verticality of drilling rod.Wherein, common and the sensor interface of the 3rd input module, for the value at the inclination angle that receives chassis 4, the 3rd processing module compares with value and the 3rd higher limit at this inclination angle, in the situation of value greater than the 3rd higher limit at inclination angle, the 3rd control module makes and adds pressure electromagnetic valve 3 cut-offs.

Preferably, described the 3rd processing module can also be used for value and the 3rd lower limit at described inclination angle are compared, and sends comparative result to described the 3rd control module;

It is in the situation of value less than described the 3rd lower limit at described inclination angle that described the 3rd control module is used at comparative result, makes described pressure electromagnetic valve 3 conductings that add.

With above-mentioned the 3rd higher limit in the same manner, the 3rd lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if add pressure electromagnetic valve 3 because the value at the inclination angle in domain 4 is cut off greater than the 3rd upper limit, at this moment drilling rod 5 no longer bears the second output pressure of pressurization oil cylinder 2, chassis 4 can not born the reaction force of the second output pressure of pressurization oil cylinder 2 more yet, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore the 3rd lower limit to be set, the inclination angle on chassis 4 is monitored.The 3rd processing module compares value and the 3rd lower limit at inclination angle, and when comparative result is the inclination angle value on chassis 4 during less than the 3rd lower limit, the 3rd control module makes and adds pressure electromagnetic valve 3 conductings, thereby makes drilling rod 5 normal operations.

Preferably, described the 3rd controller 23 is PLC equipment.PCL equipment is easy to use, and cost is lower, and can satisfy the requirement of controller of the present invention, therefore uses PLC equipment in the preferred embodiment of the present invention.

Need to prove; above-mentioned various preferred embodiments of the present invention can at random make up; that is to say that controller of the present invention can provide the drilling rod of rotary drilling rig any one in moment of torsion, pressure and the verticality, two or three to monitor, thereby can optionally use according to the actual needs of drilling rod protection.

In addition; the invention provides a kind of protective device for rotary drilling rig; described rotary drilling rig comprises drilling rod 5 and is used for driving the main pump 1 that this drilling rod 5 rotates; wherein; described protective device comprises the depth sensor for detection of the value of the degree of depth of described drilling rod 5; for detection of the first sensor 11 of the value of the first output pressure of described main pump 1 be used for the first controller 21 that the first output pressure of described main pump 1 is adjusted; this first controller 21 comprises the first input module that connects successively; the first processing module and the first control module; wherein

Described depth sensor be connected first sensor 11 and be connected with described the first input module, described the first input module is used for and will be sent to described the first processing module from the value of the degree of depth of the described drilling rod 5 of described depth sensor with from the value of the first output pressure of the described main pump 1 of described first sensor 11;

Protective device of the present invention comprises above-mentioned controller of the present invention, thereby is used for realizing above-mentioned guard method of the present invention.

In rotary drilling rig, main pump 1 is used for providing the drilling rod power that 5 rotations pierce, so the moment of torsion that drilling rod bears is relevant with the first output pressure of main pump 1, and if the moment of torsion that drilling rod bears greater than its peak torque that can bear, drilling rod will deform, thereby affects the normal operation of drilling rod.

Protective device of the present invention comprises for detection of the depth sensor of the value of the degree of depth of described drilling rod 5 with for detection of the first sensor 11 of the value of the first output pressure of described main pump 1; this comprises for the first controller 21 that the first output pressure of described main pump 1 is adjusted in addition; depth sensor and first sensor 11 are sent to the value of the first output pressure of the value of the degree of depth of drilling rod 5 and main pump 1 respectively the first processing module of described controller 21; the first processing module is processed above-mentioned data in inside; be used for determining the first higher limit according to the depth value that receives; value and first higher limit of the first output pressure are compared; and comparative result is sent to the first control module; in the situation of value greater than the first higher limit of the first output pressure, the first control module is for reducing the first output pressure of main pump 1.

Above-mentioned protective device is by to the monitoring of rotary drilling rig and to the judgement of monitoring result, the output of FEEDBACK CONTROL main pump 1, thus realized drilling rod is crossed the function of turning round protection.

Preferably, described the first processing module also is used for determining the first lower limit, the value of described the first output pressure and described the first lower limit are compared and comparative result being sent to described the first control module according to the value of the described degree of depth;

It is in the situation of value less than described the first lower limit of described the first output pressure that described the first control module is used at comparative result, improves the first output pressure of described main pump 1.

With above-mentioned the first higher limit in the same manner, the first lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if the first output pressure of main pump 1 is owing to being lowered greater than the first higher limit, at this moment the moment of torsion that bears of drilling rod will diminish, therefore but the first output pressure of main pump 1 is reduced to the normal operation that to a certain degree will affect drilling rod, first lower limit will be set the first output pressure of main pump 1 is monitored.The output that will suitably increase main pump 1 during less than this first lower limit when the first output pressure value of main pump 1.Particularly, when the first processing module compares the value of the first output pressure and the first lower limit and comparative result is sent to the first control module, when the value of the first output pressure during less than the first lower limit, the first control module improves the first output pressure of main pump 1.Wherein, the acquisition of the acquisition of the first lower limit and the first higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.By technique scheme, protective device of the present invention can be too small at the moment of torsion of drilling rod input and improve the first output pressure of main pump 1 in the situation that can't work, to guarantee the drilling rod normal operation.

Preferably; described rotary drilling rig also comprises by adding the pressurization oil cylinder 2 of 3 pairs of described drilling rod 5 pressurizations of pressure electromagnetic valve; described protective device also comprises for detection of the second sensor 12 of the value of the second output pressure of described pressurization oil cylinder 2 and is used for controlling the described second controller 22 that adds pressure electromagnetic valve 3 conductings or cut-off; this second controller 22 comprises the second input module, the second processing module and the second control module that connects successively; wherein

Described the second sensor 12 is connected with described the second input module, and described the first input module is used for and will be sent to described the second processing module from the value of the second output pressure of the described pressurization oil cylinder 2 of described the second sensor 12;

Described the second processing module is used for determining second upper limit, the value of described the second output pressure and described the second higher limit are compared and comparative result being sent to described the second control module according to the value of the described degree of depth;

In the course of work of rotary drilling rig, drilling rod not only bears moment of torsion owing to self rotating, and also can constantly pierce downwards because of the effect that is under pressure.Drilling rod is not only provided the power of rotation by main pump 1, the downward power that the oil cylinder 2 that also is subject to pressurizeing provides.Along with the elongation of drilling rod, the maximum pressure that drilling rod can bear also reduces gradually, if the maximum pressure that drilling rod can bear under the current degree of depth greater than drilling rod at the actual pressure that bears under the current degree of depth, drilling rod will deform.Protective device of the present invention also comprises the second sensor 12 and second controller 22; this second sensor 12 is for detection of the value of the second output pressure of described pressurization oil cylinder 2, and this second controller 22 prevents that by the monitoring to the second output pressure of pressurization oil cylinder 2 drilling rod from above-mentioned overvoltage fault occuring.

Described the first input module is used for and will be sent to described the second processing module from the value of the second output pressure of the described pressurization oil cylinder 2 of described the second sensor 12, the second processing module is determined the second higher limit, the value of the second output pressure and the second higher limit are compared and comparative result is sent to the second control module according to the depth value of drilling rod 5, the value of judging the second output pressure when the second processing module is during greater than the second higher limit, and the control of the second control module adds pressure electromagnetic valve 3 cut-offs.

Above-mentioned protective device is by to the monitoring of rotary drilling rig and to the judgement of monitoring result, thereby FEEDBACK CONTROL adds the output of pressure electromagnetic valve 3 control pressurization oil cylinders 2, has realized drilling rod is crossed the function of turning round protection.

With above-mentioned the second higher limit in the same manner, the second lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if add pressure electromagnetic valve 3 owing to the pressurization oil cylinder 2 the second output pressure be cut off greater than the second higher limit, at this moment drilling rod no longer bears the second output pressure of pressurization oil cylinder 2, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore second lower limit will be set the second output pressure of pressurization oil cylinder 2 is monitored.When value and described second lower limit of the second processing module with described the second output pressure compares, and the second output pressure value of judging pressurization oil cylinder 2 is during less than this second lower limit, and the second control module makes and adds pressure electromagnetic valve 3 conductings.Wherein, the acquisition of the acquisition of the second lower limit and the second higher limit is basic identical, also is by test and/or empirical value, repeats no more herein.Pass through technique scheme; protective device of the present invention can be too small at the pressure of the 2 pairs of drilling rods of pressurization oil cylinder input and make in the situation that drilling rod can't be worked and add pressure electromagnetic valve 3 conductings; thereby make the second output pressure of pressurization oil cylinder 2 act on drilling rod, to guarantee the drilling rod normal operation.

Preferably; described rotary drilling rig also comprises by adding the pressurization oil cylinder 2 of 3 pairs of described drilling rod 5 pressurizations of pressure electromagnetic valve; described protective device also comprises for detection of the 3rd sensor 13 of the value at the inclination angle on chassis 4 and is used for controlling described the 3rd controller 23 that adds pressure electromagnetic valve 3 conductings or cut-off; the 3rd controller 23 comprises the 3rd input module, the 3rd processing module and the 3rd control module that connects successively; wherein

Described the 3rd sensor 13 is connected with described the 3rd input module, and described the 3rd input module is used for and will be sent to described the 3rd processing module from the value at the inclination angle on the described chassis 4 of described the 3rd sensor 13;

Described the 3rd processing module is used for value and described the 3rd higher limit at described inclination angle are compared, and comparative result is sent to described the 3rd control module;

It is in the situation of value greater than described the 3rd higher limit at described inclination angle that described the 3rd control module is used at comparative result, makes described pressure electromagnetic valve 3 cut-offs that add.

Therefore; protective device provided by the invention also comprises the 3rd sensor 13 and the 3rd controller 23; the 3rd sensor 13 detects the inclination angle on chassis 4; second controller 23 is judged and is added pressure electromagnetic valve 3 cut-offs when inclination angle when chassis 4 is greater than the 3rd higher limit; the oil cylinder 2 that namely pressurizes no longer pressurizes to drilling rod, does not also just have reaction force acts and 4 causes the inclination angle on chassis 4 further to enlarge on the chassis.

In the preferred embodiment provided by the invention, the 3rd controller 23 is used for monitoring the verticality of drilling rod.Wherein, described the 3rd input module is used for and will be sent to described the 3rd processing module from the value at the inclination angle on the described chassis 4 of described the 3rd sensor 13, the 3rd processing module compares with value and the 3rd higher limit at this inclination angle, in the situation of value greater than the 3rd higher limit at inclination angle, the 3rd control module makes and adds pressure electromagnetic valve 3 cut-offs.

Above-mentioned protective device is by to the monitoring of rotary drilling rig and to the judgement of monitoring result, thereby FEEDBACK CONTROL adds the output of pressure electromagnetic valve 3 control pressurization oil cylinders 2, has realized the function to the protection of drilling rod verticality.

With above-mentioned the 3rd higher limit in the same manner, the 3rd lower limit also can be set be used for guaranteeing that drilling rod can work.For a continuous course of work, if add pressure electromagnetic valve 3 because the value at the inclination angle in domain 4 is cut off greater than the 3rd upper limit, at this moment drilling rod 5 no longer bears the second output pressure of pressurization oil cylinder 2, chassis 4 can not born the reaction force of the second output pressure of pressurization oil cylinder 2 more yet, but this state continuance is to the normal operation that to a certain degree will affect drilling rod, therefore the 3rd lower limit to be set, the inclination angle on chassis 4 is monitored.The 3rd processing module compares value and the 3rd lower limit at inclination angle, and when comparative result is the inclination angle value on chassis 4 during less than the 3rd lower limit, the 3rd control module makes and adds pressure electromagnetic valve 3 conductings, thereby makes drilling rod 5 normal operations.Pass through technique scheme; protective device of the present invention can be too small at the pressure of the 2 pairs of drilling rods of pressurization oil cylinder input and make in the situation that drilling rod can't be worked and add pressure electromagnetic valve 3 conductings; thereby make the second output pressure of pressurization oil cylinder 2 act on drilling rod, to guarantee the drilling rod normal operation.

Need to prove; above-mentioned various preferred embodiments of the present invention can at random make up; that is to say that protective device of the present invention can provide the drilling rod of rotary drilling rig any one in moment of torsion, pressure and the verticality, two or three to monitor and FEEDBACK CONTROL, thereby can optionally use according to the actual needs of drilling rod protection.

In addition, the present invention also provides a kind of rotary drilling rig, and this rotary drilling rig comprises above-mentioned protective device of the present invention.By this protective device, rotary drilling rig of the present invention can provide the drilling rod of rotary drilling rig any one in moment of torsion, pressure and the verticality, two or three to monitor and FEEDBACK CONTROL, thereby above-mentioned defencive function can be provided according to actual needs.

Below describe by reference to the accompanying drawings preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.

Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible combinations.

In addition, also can carry out any combination between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims

1. guard method that is used for rotary drilling rig, described rotary drilling rig comprise drilling rod (5) and are used for driving the main pump (1) that this drilling rod (5) rotates, it is characterized in that described guard method comprises:

Detect the value of the first output pressure of the value of the degree of depth of described drilling rod (5) and described main pump (1);

Determine the first higher limit according to the value of the described degree of depth, value and described first higher limit of described the first output pressure compared, when the value of described the first output pressure during greater than described the first higher limit, reduce the first output pressure of described main pump (1).

2. guard method according to claim 1 is characterized in that, the value of the peak torque that the corresponding described drilling rod of described the first higher limit (5) can bear under the described degree of depth.

3. guard method according to claim 1 is characterized in that, described guard method also comprises:

Determine the first lower limit according to the value of the described degree of depth, value and described first lower limit of described the first output pressure compared, when the value of described the first output pressure during less than described the first lower limit, improve the output pressure of described main pump (1).

4. guard method according to claim 3 is characterized in that, the value of the minimal torque that the corresponding described drilling rod of described the first lower limit (5) can work under the described degree of depth.

5. guard method according to claim 3 is characterized in that, described rotary drilling rig comprises that described guard method also comprises by adding pressure electromagnetic valve (3) to the pressurization oil cylinder (2) of described drilling rod (5) pressurization:

Detect the value of the second output pressure of described pressurization oil cylinder (2);

Determine the second higher limit according to the value of the described degree of depth, value and described second higher limit of described the second output pressure compared, when the value of described the second output pressure during greater than described the second higher limit, make described pressure electromagnetic valve (3) cut-off that adds.

6. guard method according to claim 5 is characterized in that, the value of the maximum pressure that the corresponding described drilling rod of described the second higher limit (5) can bear under the described degree of depth.

7. guard method according to claim 5 is characterized in that, described guard method also comprises:

According to described Depth determination the second lower limit, value and described second lower limit of described the second output pressure compared, when the value of described the second output pressure during less than described the second lower limit, make described pressure electromagnetic valve (3) conducting that adds.

8. guard method according to claim 7 is characterized in that, the value of the minimum pressure that the corresponding described drilling rod of described the second lower limit (5) can work under the described degree of depth.

9. guard method according to claim 1 is characterized in that, described rotary drilling rig comprises that described guard method also comprises by adding pressure electromagnetic valve (3) to the pressurization oil cylinder (2) of described drilling rod (5) pressurization:

Detect the value at inclination angle on the chassis (4) of described rotary drilling rig;

Value and the 3rd higher limit at described inclination angle are compared, when the value at described inclination angle during greater than described the 3rd higher limit, make described pressure electromagnetic valve (3) cut-off that adds.

10. guard method according to claim 5 is characterized in that, described guard method also comprises:

11. according to claim 9 or 10 described guard methods; it is characterized in that, the corresponding described drilling rod (5) of described the 3rd higher limit but the value of verticality inclination maximum on corresponding described chassis (4) in tolerance range the time, under the second output pressure of described pressurization oil cylinder (2).

12. according to claim 9 or 10 described guard methods, it is characterized in that described guard method also comprises:

Value and the 3rd lower limit at described inclination angle are compared, when the value at described inclination angle during less than described the 3rd lower limit, make described pressure electromagnetic valve (3) conducting that adds.

13. guard method according to claim 12 is characterized in that, the value of the minimum angle-of-incidence of corresponding chassis (4) when the corresponding described drilling rod of described the 3rd lower limit (5) can work, under the second output pressure of described pressurization oil cylinder (2).

14. controller for the protection of rotary drilling rig; described rotary drilling rig comprises drilling rod (5) and is used for driving the main pump (1) that this drilling rod (5) rotates; described controller comprises for the first controller (21) that the first output pressure of described main pump (1) is adjusted; this first controller (21) comprises the first input module, the first processing module and the first control module that connects successively; it is characterized in that

Described the first input module is used for receiving the value of the first output pressure of the value of the degree of depth of described drilling rod (5) and described main pump (1), and the value of the first output pressure of the value of the degree of depth of described drilling rod (5) and described main pump (1) is sent to described the first processing module;

It is in the situation of value greater than described the first higher limit of described the first output pressure that described the first control module is used at comparative result, reduces the first output pressure of described main pump (1).

15. controller according to claim 14 is characterized in that,

Described the first processing module also is used for determining the first lower limit, the value of described the first output pressure and described the first lower limit are compared and comparative result being sent to described the first control module according to the value of the described degree of depth;

It is in the situation of value less than described the first lower limit of described the first output pressure that described the first control module is used at comparative result, improves the output pressure of described main pump (1).

16. according to claim 14 or 15 described controllers, it is characterized in that described the first controller (21) is PLC equipment.

17. controller according to claim 14, it is characterized in that, described rotary drilling rig also comprises by adding pressure electromagnetic valve (3) to the pressurization oil cylinder (2) of described drilling rod (5) pressurization, described controller also comprises be used to controlling the described second controller that adds pressure electromagnetic valve (3) conducting or cut-off, described second controller comprises the second input module, the second processing module and the second control module that connects successively

Described the second input module is used for receiving the value of the second output pressure of the value of the degree of depth of described drilling rod (5) and described pressurization oil cylinder (2), and the value of the second output pressure of the value of the degree of depth of described drilling rod (5) and described pressurization oil cylinder (2) is sent to described the second processing module;

Described the second processing module is used for determining corresponding default the second higher limit, the value of described the second output pressure and described the second higher limit are compared and comparative result being sent to described the second control module according to the value of the described degree of depth;

It is in the situation of value greater than described the second higher limit of described the second output pressure that described the second control module is used at comparative result, makes described pressure electromagnetic valve (3) cut-off that adds.

18. controller according to claim 17 is characterized in that,

Described the second processing module can also be used for determining corresponding default the second lower limit, value and described second lower limit of described the second output pressure being compared according to the value of the described degree of depth, and comparative result is sent to described the second control module;

It is in the situation of value less than described the second higher limit of described the second output pressure that described the second control module is used at comparative result, makes described pressure electromagnetic valve (3) conducting that adds.

19. according to claim 17 or 18 described controllers, it is characterized in that described second controller (22) is PLC equipment.

20. controller according to claim 14, it is characterized in that, described rotary drilling rig also comprises by adding pressure electromagnetic valve (3) to the pressurization oil cylinder (2) of described drilling rod (5) pressurization, described controller also comprises be used to controlling described the 3rd controller that adds pressure electromagnetic valve (3) conducting or cut-off, described the 3rd controller comprises the 3rd input module, the 3rd processing module and the 3rd control module that connects successively

Described the 3rd input module be used for to receive the value at the inclination angle on chassis (4), and the value at the inclination angle of this chassis (4) is sent to described the 3rd processing module;

Described the 3rd processing module is used for value and the 3rd higher limit at described inclination angle are compared, and comparative result is sent to described the 3rd control module;

Described the 3rd control module is used in the situation of the value that relatively is combined into described inclination angle greater than described the 3rd higher limit, makes described pressure electromagnetic valve (3) cut-off that adds.

21. controller according to claim 17, it is characterized in that, described controller comprises that also described the 3rd controller comprises the 3rd input module, the 3rd processing module and the 3rd control module be used to controlling described the 3rd controller that adds pressure electromagnetic valve (3) conducting or cut-off

22. according to claim 20 or 21 described controllers, it is characterized in that,

Described the 3rd processing module can also be used for value and the 3rd lower limit at described inclination angle are compared, and sends comparative result to described the 3rd control module;

It is in the situation of value less than described the 3rd lower limit at described inclination angle that described the 3rd control module is used at comparative result, makes described pressure electromagnetic valve (3) conducting that adds.

23. controller according to claim 22 is characterized in that, described the 3rd controller (23) is PLC equipment.

24. protective device that is used for rotary drilling rig; described rotary drilling rig comprises drilling rod (5) and is used for driving the main pump (1) that this drilling rod (5) rotates; it is characterized in that; described protective device comprises the depth sensor for detection of the value of the degree of depth of described drilling rod (5); for detection of the first sensor (11) of the value of the first output pressure of described main pump (1) be used for the first controller (21) that the first output pressure of described main pump (1) is adjusted; this first controller (21) comprises the first input module that connects successively; the first processing module and the first control module; wherein

Described depth sensor be connected first sensor (11) and be connected with described the first input module, described the first input module is used for and will be sent to described the first processing module from the value of the degree of depth of the described drilling rod (5) of described depth sensor with from the value of the first output pressure of the described main pump (1) of described first sensor (11);

25. protective device according to claim 24 is characterized in that,

It is in the situation of value less than described the first lower limit of described the first output pressure that described the first control module is used at comparative result, improves the first output pressure of described main pump (1).

26. protective device according to claim 24 is characterized in that, described the first controller (21) is PLC equipment.

27. protective device according to claim 24; it is characterized in that; described rotary drilling rig also comprises by adding the pressurization oil cylinder (2) of pressure electromagnetic valve (3) to described drilling rod (5) pressurization; described protective device also comprises for detection of second sensor (12) of the value of the second output pressure of described pressurization oil cylinder (2) be used to controlling the described second controller (22) that adds pressure electromagnetic valve (3) conducting or cut-off; this second controller (22) comprises the second input module, the second processing module and the second control module that connects successively; wherein

Described the second sensor (12) is connected with described the second input module, and described the first input module is used for and will be sent to described the second processing module from the value of the second output pressure of the described pressurization oil cylinder (2) of described the second sensor (12);

Described the second processing module is used for determining the second higher limit, the value of described the second output pressure and described the second higher limit are compared and comparative result being sent to described the second control module according to the value of the described degree of depth;

28. protective device according to claim 27 is characterized in that,

29. protective device according to claim 27 is characterized in that, described second controller (22) is PLC equipment.

30. protective device according to claim 24; it is characterized in that; described rotary drilling rig also comprises by adding the pressurization oil cylinder (2) of pressure electromagnetic valve (3) to described drilling rod (5) pressurization; described protective device also comprises for detection of the 3rd sensor (13) of the value at the inclination angle of chassis (4) be used to controlling described the 3rd controller (23) that adds pressure electromagnetic valve (3) conducting or cut-off; the 3rd controller (23) comprises the 3rd input module, the 3rd processing module and the 3rd control module that connects successively; wherein

Described the 3rd sensor (13) is connected with described the 3rd input module, and described the 3rd input module is used for and will be sent to described the 3rd processing module from the value at the inclination angle on the described chassis (4) of described the 3rd sensor (13);

It is in the situation of value greater than described the 3rd higher limit at described inclination angle that described the 3rd control module is used at comparative result, makes described pressure electromagnetic valve (3) cut-off that adds.

31. protective device according to claim 27; it is characterized in that; described protective device also comprises for detection of the 3rd sensor (13) at the inclination angle of chassis (4) and is used for controlling described the 3rd controller (23) that adds pressure electromagnetic valve (3) conducting or cut-off; the 3rd controller (23) comprises the 3rd input module, the 3rd processing module and the 3rd control module that connects successively; wherein

32. according to claim 30 or 31 described protective devices, it is characterized in that,

33. protective device according to claim 32 is characterized in that, described the 3rd controller (23) is PLC equipment.

34. a rotary drilling rig is characterized in that, this rotary drilling rig comprises the described protective device of any one in the claims 24 to 33.