A drilling rig automatic make and break pipe follow-up feed system and method of use

Abstract

The present application relates to a kind of drilling rig automatic loading and unloading drill rod servo feed system, including the first reversing valve in servo motor inlet and outlet pipeline, first reversing valve is connected with the first oil pipe connected with servo motor inlet, the first oil cylinder pipe connected with the inlet and outlet of feed pull-out oil cylinder, the second oil cylinder pipe connected with the inlet and outlet of feed pull-out oil cylinder.The present application is used, by the setting of first reversing valve, realize servo motor to give supply feed pull-out oil cylinder hydraulic oil, and because power head rotary motor is rotated by power box input shaft and servo motor with power box output shaft is driven, to realize the rotation of output shaft and the output shaft feed in a power driven synchronous, realize the proportion matching between the rotational speed of power head rotary motor and the feed / pull-out speed of feed pull-out oil cylinder, and by adjusting mode, realize that power head rotates a circle, and the displacement distance of feed / pull-out is all the thread pitch distance of drill pipe connection thread, to facilitate the loading and unloading of drill pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal mines, in particular to the field of coal mine drill rods, and more particularly to a drill rig automatic drill rod loading and unloading follow-up feeding system. BACKGROUND

[0002] An intelligent drill rig in a coal mine needs to have the function of automatically loading and unloading drill rods without manual control. The difficulty of automatic loading and unloading of drill rods lies in matching the rotation speed of the power head with the feeding / extracting speed, matching the feeding / extracting force and the rotation torque, and the thread angle during loading of the drill rod. If the matching is not good, it will cause damage to the thread buckle of the drill rod connection, and the drill rod cannot be successfully loaded and unloaded. When a conventional hydraulic system uses two groups of proportional valves to control the rotation of the power head and the feeding / extracting action respectively, it is difficult to achieve reasonable matching, the success rate of loading and unloading of the drill rod is low, the thread of the drill rod connection is severely worn, and the reliability and service life of the drill rod connection are reduced. SUMMARY

[0003] The present application provides a drill rig automatic drill rod loading and unloading follow-up feeding system and a method for using the same, which realizes a fixed proportion matching between the rotation speed of the power head and the feeding / extracting speed of the feeding / extracting cylinder during loading and unloading of the drill rod. During one rotation of the power head, the displacement distance of the feeding / extracting is one thread pitch of the drill rod connection thread. Through the setting of the accumulator, the thread angle deviation during loading of the drill rod and the speed error during follow-up matching during loading and unloading of the drill rod are compensated, so as to avoid thread wear caused by rigid loading and unloading.

[0004] The present application is achieved by the following technical scheme, a drill rig automatic drill rod loading and unloading follow-up feeding system, comprising a power box, a feeding / extracting cylinder for driving the power box to move, a power head rotation motor connected to the input shaft of the power box, a drill rod threadedly connected to the output shaft of the power box, and a follow-up motor connected to the intermediate shaft of the power box, characterized in that: it further comprises a first reversing valve located on the follow-up motor inlet and outlet pipeline, a first oil pipe connected to the first oil port of the follow-up motor, a first cylinder oil pipe connected to the extraction inlet of the feeding / extracting cylinder, and a second cylinder oil pipe connected to the feeding inlet of the feeding / extracting cylinder.

[0005] In use, the first reversing valve is provided to realize the supply of hydraulic oil from the follow-up motor to the feeding / extracting cylinder. Since the power head rotation motor drives the power box output shaft and the follow-up motor to rotate through the power box input shaft, the rotation of the output shaft and the feeding of the output shaft are synchronized under the drive of one power, realizing a fixed proportion matching between the rotation speed of the power head and the feeding / extracting speed of the feeding / extracting cylinder. By adjusting, one rotation of the power head is realized, and the displacement distance of the feeding / extracting is one thread pitch of the drill rod connection thread, thereby facilitating the loading and unloading of the drill rod.

[0006] As preferred, the oil feeding and returning pipeline comprises a second oil pipe connecting the second oil port of the follow-up motor and the first reversing valve, and the second oil pipe is further provided with an accumulator.

[0007] The preferred scheme, through the setting of the accumulator, when the thread angle deviation causes jamming, the required feeding driving force gradually increases, the pressure of the oil outlet of the follow-up motor increases, the accumulator starts to store the hydraulic oil of the oil outlet of the follow-up motor, thereby starting to compensate the thread angle deviation and eliminating the jamming phenomenon during the thread make-up.

[0008] As preferred, it further comprises a pressure relief pipe connecting the first oil pipe and the second oil pipe, and the pressure relief pipe is provided with a pressure relief valve.

[0009] The preferred scheme, through the setting of the pressure relief valve, ensures the setting of the maximum follow-up feeding pulling force during the automatic make-up and break-out, through the setting of the pressure relief valve and the accumulator, reduces the rigid operation during the automatic make-up and break-out of the drill pipe, compensates the linear error during the follow-up make-up and break-out of the drill pipe, realizes the flexible make-up and break-out of the drill pipe, thereby protecting the drill pipe thread, and reducing the wear.

[0010] As preferred, the pulling-in oil inlet and the feeding oil inlet of the feeding and pulling-in oil cylinder are respectively connected with a first oil cylinder oil path and a second oil cylinder oil path, and the first oil cylinder oil path and the second oil cylinder oil path are both connected with a hydraulic control check valve.

[0011] The preferred scheme, through the setting of the hydraulic control check valve, avoids the oil of the follow-up motor driving the feeding and pulling-in oil cylinder flowing back to the normal control external oil path through the first oil cylinder oil path and the second oil cylinder oil path.

[0012] As preferred, the first oil port and the second oil port of the power head rotating motor are respectively connected with a first rotating oil path and a second rotating oil path, the first rotating oil path and the second rotating oil path are both connected with a second reversing valve, the first reversing valve is further connected with a first control oil pipe and a second control oil pipe connected with the second reversing valve, the second reversing valve is further connected with a first main oil path and a second main oil path, and the first reversing valve is a hydraulic reversing valve.

[0013] The preferred scheme, in use, when normally working, the first main oil path and the first rotating oil path are communicated, and the second main oil path and the second rotating oil path are communicated, when feeding and pulling-in, the first main oil path is further communicated with the second control oil pipe, and the second main oil path is further communicated with the first control oil pipe; through the setting of the hydraulic reversing valve, the second reversing valve is conveniently switched by the hydraulic oil.

[0014] As preferred, the second reversing valve is an electromagnetic reversing valve.

[0015] A use method of a follow-up feeding system of an automatic drill pipe make-up and break-out rig, comprising the following steps:

[0016] In the normal state, the external oil circuit drives the feeding and pulling cylinder to work through the first and second oil cylinder oil circuits, the power head rotary motor is connected with the first main oil circuit through the first rotary oil circuit and with the second main oil circuit through the second rotary oil circuit, and the power head rotary motor drives the servo motor to work on the oil inlet and outlet pipeline through the power box.

[0017] When the feeding and pulling cylinder needs to be driven to buckle, the second reversing valve is switched by electricity, the power head rotary motor is driven to rotate, the servo motor is driven to rotate through the intermediate shaft, the first main oil circuit is filled with oil, the second main oil circuit is drained, the first oil pipe is filled with oil, the second oil pipe is drained, the hydraulic control check valve seals the oil circuit, and the oil driven by the servo motor to drive the feeding and pulling cylinder is prevented from flowing back to the normal control external oil circuit through the first and second oil cylinder oil circuits, the first main oil circuit is connected with the first rotary oil circuit and the second control oil pipe, the second main oil circuit is connected with the second rotary oil circuit and the first control oil pipe, the oil in the first main oil circuit is high-pressure oil, the second reversing valve is connected with the first reversing valve through the first and second control oil pipes, and thus the first reversing valve is switched to the servo feeding working position, at this time, the second oil pipe and the second oil cylinder oil pipe are connected with the external oil return pipeline, the first oil pipe and the first oil cylinder oil pipe are connected with the external oil return pipeline, the servo motor supplies oil to the feeding and pulling cylinder, the feeding and pulling cylinder feeds and buckles, and the feeding and pulling cylinder drives the entire power box to feed.

[0018] When the feeding and pulling cylinder needs to be driven to buckle, the second reversing valve is switched by electricity, the power head rotary motor is driven to rotate, the servo motor is driven to rotate through the intermediate shaft, the first main oil circuit is filled with oil, the second main oil circuit is drained, the first oil pipe is filled with oil, the second oil pipe is drained, the hydraulic control check valve seals the oil circuit, and the oil driven by the servo motor to drive the feeding and pulling cylinder is prevented from flowing back to the normal control external oil circuit through the first and second oil cylinder oil circuits, the first main oil circuit is connected with the first rotary oil circuit and the second control oil pipe, the second main oil circuit is connected with the second rotary oil circuit and the first control oil pipe, the oil in the first main oil circuit is high-pressure oil, the second reversing valve is connected with the first reversing valve through the first and second control oil pipes, and thus the first reversing valve is switched to the servo feeding working position, at this time, the second oil pipe and the second oil cylinder oil pipe are connected with the external oil return pipeline, the first oil pipe and the first oil cylinder oil pipe are connected with the external oil return pipeline, the servo motor supplies oil to the feeding and pulling cylinder, the feeding and pulling cylinder feeds and buckles, and the feeding and pulling cylinder drives the entire power box to feed.

[0019] Thus, the output shaft is rotated and moved at the same time, and thus the threaded connection of the drill pipe is conveniently buckled and unbuckled.

[0020] The use method of the automatic drill rod loading and unloading follow-up feeding system of the drilling machine further comprises the following steps: when the drill rod is loaded in follow-up feeding, the initial thread feeding angle cannot be just right, so there is an angle deviation of less than one thread pitch in the follow-up feeding process, which can cause the thread to be stuck when being screwed, and when the angle deviation of the thread feeding causes the thread to be stuck, the required feeding driving force gradually increases, the pressure of the oil outlet of the follow-up motor increases, the accumulator starts to store the hydraulic oil of the oil outlet of the follow-up motor, so as to start to compensate the angle deviation of the thread feeding and eliminate the stuck phenomenon when the thread is screwed.

[0021] Through the setting of the pressure relief valve, the maximum follow-up feeding pulling force during the automatic loading and unloading of the thread is ensured.

[0022] Through the setting of the pressure relief valve and the feeding motor, the rigidity operation during the automatic loading and unloading of the drill rod is reduced, the linear error during the follow-up loading and unloading of the drill rod is compensated, the flexible loading and unloading of the drill rod is realized, so as to protect the drill rod thread, and reduce the wear.

[0023] The use method of the automatic drill rod loading and unloading follow-up feeding system of the drilling machine further comprises that the movement speed of the feeding direction of the feeding and pulling oil cylinder and the rotating speed of the follow-up motor are in a linear proportional relationship, and the rotating speed of the follow-up motor and the rotating speed of the output shaft of the power box are in a constant ratio transmission, so that the feeding and pulling speed of the thread during the follow-up loading and unloading of the drill rod is in a positive proportional linear relationship with the rotating speed of the drill rod of the power head, and the mathematical model formula is:

[0024]

[0025] Among them:

[0026] The transmission speed ratio i1 between the input shaft of the power box and the intermediate shaft, the transmission speed ratio i2 between the intermediate shaft and the output shaft of the power box; the rotating speed S1 of the input shaft of the power box, the rotating speed S2 of the intermediate shaft, the rotating speed S3 of the output shaft of the power box; the thread pitch L of the drill rod thread; the displacement V of the follow-up motor, and the annular area A of the feeding and pulling oil cylinder.

[0027] The beneficial effects of the present application are that: through the setting of the first reversing valve, the follow-up motor supplies hydraulic oil to the feeding and pulling oil cylinder, and since the power head rotating motor drives the output shaft of the power box and the follow-up motor to rotate through the input shaft of the power box, the rotation of the output shaft and the feeding of the output shaft are synchronized under the drive of one power, the constant proportional matching between the rotating speed of the power head rotating motor and the feeding / pulling speed of the feeding and pulling oil cylinder is realized, and the displacement distance of the feeding / pulling is one thread pitch of the drill rod connecting thread when the power head rotates one circle through adjustment, so that the loading and unloading of the drill rod is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a structural schematic diagram of the present application.

[0029] Fig. 2 With pipeline index map for the present application;

[0030] Fig. 3 With power box perspective view;

[0031] The figure shows:

[0032] 1, power head rotary motor, 2, follow-up motor, 3, pressure relief valve, 4, accumulator, 5, first reversing valve, 6, second reversing valve, 7, feeding and pulling cylinder, 8, hydraulic control check valve, 10, power box, 11, input shaft, 12, intermediate shaft, 13, output shaft, 14, first rotary oil circuit, 15, second rotary oil circuit, 16, first main oil circuit, 17, second main oil circuit, 20, first oil pipe, 21, second oil pipe, 50, first cylinder oil pipe, 51, second cylinder oil pipe, 60, first control oil pipe, 61, second control oil pipe, 110, first cylinder oil circuit, 111, second cylinder oil circuit. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of the present application, the present application will be described below through specific embodiments.

[0034] Referring to the drawings Figs. 1-3 The present application is a kind of drilling rig automatic loading and unloading drill rod follow-up feeding system and its use method, system includes power box 10, power box 10 also into reduction gearbox, for prior art, power box 10 is provided with input shaft 11, output shaft 13, intermediate shaft 12, wherein the input shaft 11 is connected with power head rotary motor 1, power head rotary motor 1 as the input power of power box 10, intermediate shaft 12 is connected with follow-up motor 2, intermediate shaft 12 rotates and drives follow-up motor to rotate.

[0035] The side of power box 10 is provided with feeding and pulling cylinder 7 along the axial direction of output shaft 13 to push power box 10 to move, the piston rod of feeding and pulling cylinder is fixed, the cylinder body moves, the cylinder body of feeding and pulling cylinder is connected with power box.

[0036] The pulling oil inlet and feeding oil inlet of feeding and pulling cylinder are respectively connected with first cylinder oil circuit and second cylinder oil circuit, and the first cylinder oil circuit and the second cylinder oil circuit are connected with the hydraulic control check valve.

[0037] The follow-up motor 2 is connected with a first reversing valve 5, the first reversing valve 5 is a hydraulic control reversing valve, the first reversing valve 5 is connected with a first oil pipe 20 connected with the first oil port of the follow-up motor 2, a first oil cylinder oil pipe 50 connected with the pulling-in oil port of the feeding and pulling-out oil cylinder 7, a second oil cylinder oil pipe 51 connected with the feeding oil port of the feeding and pulling-out oil cylinder 7, the first oil cylinder oil pipe and the second oil cylinder oil pipe are both provided with a three-way pipe, the first oil cylinder oil pipe is connected with the first oil cylinder oil pipe through the three-way pipe, and the second oil cylinder oil pipe is connected with the second oil cylinder oil pipe through the three-way pipe.

[0038] The follow-up motor 2 is connected with a first reversing valve 5, the first reversing valve 5 is a hydraulic control reversing valve, the first reversing valve 5 is connected with a first oil pipe 20 connected with the first oil port of the follow-up motor 2, a first oil cylinder oil pipe 50 connected with the pulling-in oil port of the feeding and pulling-out oil cylinder 7, a second oil cylinder oil pipe 51 connected with the feeding oil port of the feeding and pulling-out oil cylinder 7, the first oil cylinder oil pipe and the second oil cylinder oil pipe are both provided with a three-way pipe, the first oil cylinder oil pipe is connected with the first oil cylinder oil pipe through the three-way pipe, and the second oil cylinder oil pipe is connected with the second oil cylinder oil pipe through the three-way pipe.

[0039] The first oil pipe 20 and the second oil pipe 21 are connected through a pressure relief pipe, and the pressure relief pipe is provided with a pressure relief valve 3.

[0040] The first oil cylinder oil pipe 110 and the second oil cylinder oil pipe 111 are both connected with a second reversing valve 6, and the second reversing valve 6 is an electromagnetic reversing valve.

[0041] The first oil port and the second oil port of the power head rotary motor are respectively connected with a first rotary oil pipe and a second rotary oil pipe, the first rotary oil pipe and the second rotary oil pipe are both connected with the second reversing valve, the first reversing valve is further connected with a first control oil pipe and a second control oil pipe connected with the second reversing valve, the second reversing valve is further connected with a first main oil pipe and a second main oil pipe, and the first reversing valve is a hydraulic reversing valve.

[0042] A use method of a drilling rig automatic loading and unloading drill rod follow-up feeding system, comprising the following steps:

[0043] In the normal state, the external oil pipe drives the feeding and pulling-out oil cylinder 7 to work through the first oil cylinder oil pipe 110 and the second oil cylinder oil pipe 111, the power head rotary motor 1 is connected with the first main oil pipe through the first rotary oil pipe 14 and is connected with the second main oil pipe through the second rotary oil pipe 15, and the power head rotary motor 1 drives the follow-up motor 2 to work on the follow-up oil pipe through the power box 10;

[0044] When the second reversing valve 6 is powered to reverse, the power head rotary motor 1 is rotated forward to drive the input shaft 11 of the power box 10 to rotate, and at the same time, the follow-up motor 2 is driven to rotate forward through the intermediate shaft 12, the first main oil way is filled with oil, the second main oil way is returned to oil, the first oil pipe 20 is filled with oil, the second oil pipe 21 is returned to oil, the hydraulic control check valve 8 seals the oil way to avoid the oil of the follow-up motor 2 driving the feeding and pulling oil cylinder 7 to flow back to the normal control external oil way through the first oil cylinder oil way 110 and the second oil cylinder oil way 111, the first main oil way is connected with the first rotary oil way 14 and the second control oil pipe 61, and the second main oil way is connected with the second rotary oil way 15 and the first control oil pipe 60, because the oil in the first main oil way is high-pressure oil, the second reversing valve 6 is connected with the first reversing valve 5 through the first control oil pipe 60 and the second control oil pipe 61, so that the first reversing valve 5 is switched to the follow-up feeding working position, at this time, the second oil pipe 21 and the second oil cylinder oil pipe 51 are connected, the first oil pipe 20 and the first oil cylinder oil pipe 50 are connected with the external oil return pipe at the same time, that is, the follow-up motor 2 supplies oil to the feeding and pulling oil cylinder 7, so that the feeding and pulling oil cylinder 7 feeds the make-up, that is, the feeding and pulling oil cylinder 7 drives the whole power box 10 to feed;

[0045] When the second reversing valve 6 is powered to reverse, the power head rotary motor 1 is rotated forward to drive the input shaft 11 of the power box 10 to rotate, and at the same time, the follow-up motor 2 is driven to rotate forward through the intermediate shaft 12, the first main oil way is filled with oil, the second main oil way is returned to oil, the first oil pipe 20 is filled with oil, the second oil pipe 21 is returned to oil, the hydraulic control check valve 8 seals the oil way to avoid the oil of the follow-up motor 2 driving the feeding and pulling oil cylinder 7 to flow back to the normal control external oil way through the first oil cylinder oil way 110 and the second oil cylinder oil way 111, the first main oil way is connected with the first rotary oil way 14 and the second control oil pipe 61, and the second main oil way is connected with the second rotary oil way 15 and the first control oil pipe 60, because the oil in the first main oil way is high-pressure oil, the second reversing valve 6 is connected with the first reversing valve 5 through the first control oil pipe 60 and the second control oil pipe 61, so that the first reversing valve 5 is switched to the follow-up feeding working position, at this time, the second oil pipe 21 and the second oil cylinder oil pipe 51 are connected, the first oil pipe 20 and the first oil cylinder oil pipe 50 are connected with the external oil return pipe at the same time, that is, the follow-up motor 2 supplies oil to the feeding and pulling oil cylinder 7, so that the feeding and pulling oil cylinder 7 feeds the make-up, that is, the feeding and pulling oil cylinder 7 drives the whole power box 10 to feed;

[0046] Thus, the rotation of the output shaft 13 is realized at the same time as the movement, so as to facilitate the make-up and break-out of the threaded connection of the drill pipe.

[0047] In the follow-up feed drilling rod, the initial thread angle cannot be just right, so there will be a thread angle deviation of less than a buckle distance in the follow-up feed process, which will cause the thread to be stuck. Through the setting of the accumulator 4, when the thread angle deviation causes the thread to be stuck, the required feed driving force will gradually increase, and the pressure of the oil outlet of the follow-up motor 2 will also increase. The accumulator 4 starts to store the hydraulic oil of the oil outlet of the follow-up motor 2, thereby starting to compensate the thread angle deviation and eliminating the thread sticking phenomenon during the thread make-up;

[0048] Through the setting of the pressure relief valve 3, the maximum follow-up feed pulling force during the automatic make-up and break-out process is ensured;

[0049] Through the setting of the pressure relief valve 3 and the accumulator 4, the rigidity operation during the automatic make-up and break-out of the drilling rod is reduced, the linear error during the follow-up make-up and break-out of the drilling rod is compensated, the flexible make-up and break-out of the drilling rod is realized, thereby protecting the drilling rod thread buckle and reducing the wear.

[0050] The speed of the feed pulling cylinder 7 in the feed direction is linearly proportional to the speed of the follow-up motor 2, and the speed of the follow-up motor 2 is in a constant ratio transmission with the speed of the output shaft 13 of the power box 10. Therefore, the speed of the feed pulling during the thread break-out during the follow-up make-up and break-out of the drilling rod is in a positive proportional linear relationship with the speed of the power head drilling rod, and the mathematical model formula is:

[0051]

[0052] Among them:

[0053] The transmission speed ratio i1 between the power box input shaft and the intermediate shaft, the transmission speed ratio i2 between the intermediate shaft and the power box output shaft; the speed S1 of the power box input shaft, the speed S2 of the intermediate shaft, and the speed S3 of the power box output shaft; the drilling rod thread pitch L; the follow-up motor displacement V, and the feed pulling cylinder ring area A.

[0054] Of course, the above description is not limited to the above examples, and the technical features not described in the application can be realized by or using the prior art, which will not be described here; the above examples and drawings are only used to illustrate the technical solutions of the application and are not a limitation of the application. The application has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the application do not deviate from the purpose of the application, and should also belong to the protection scope of the claims of the application.

Claims

1. A drilling rig automatic make and break pipe feeding system, comprising a power box (10), a feeding and pulling cylinder (7) driving the power box (10) to move, a power head rotary motor (1) connected with an input shaft (11) of the power box (10), a drill pipe threadedly connected with an output shaft (13) of the power box (10), and a follow-up motor (2) connected with a middle shaft (12) of the power box (10), characterized in that: The first reversing valve (5) is further connected with the first oil pipe (20) connected with the first oil port of the follow-up motor (2), the first oil cylinder pipe (50) connected with the pulling-in oil inlet of the feeding and pulling-out oil cylinder (7), and the second oil cylinder pipe (51) connected with the feeding oil inlet of the feeding and pulling-out oil cylinder (7); The feeding and returning oil pipe comprises a second oil pipe (21) connected with the second oil port of the follow-up motor (2) and the first reversing valve (5), and the second oil pipe (21) is further provided with an accumulator (4); The pressure relief pipe connected with the first oil pipe (20) and the second oil pipe (21) is further provided with a pressure relief valve (3); The pulling-in oil inlet and the feeding oil inlet of the feeding and pulling-out oil cylinder (7) are respectively connected with the first oil cylinder oil path (110) and the second oil cylinder oil path (111), and the first oil cylinder oil path (110) and the second oil cylinder oil path (111) are both connected with the hydraulic control one-way valve (8); The first oil port and the second oil port of the power head rotating motor (1) are respectively connected with the first rotating oil path (14) and the second rotating oil path (15), the first rotating oil path (14) and the second rotating oil path (15) are both connected with the second reversing valve (6), the first reversing valve (5) is further connected with the first control oil pipe (60) and the second control oil pipe (61) connected with the second reversing valve (6), the second reversing valve (6) is further connected with the first main oil path (16) and the second main oil path (17), and the first reversing valve (5) is a hydraulic reversing valve.

2. The automatic make and break pipe handling follow-up feed system for a drilling rig of claim 1 wherein: The second reversing valve (6) is an electromagnetic reversing valve.

3. The method of using an automatic make and break pipe handling follow-up feed system for a drilling rig as defined in claim 2 wherein, The method comprises the following steps: In the normal state, the external oil path drives the feeding and pulling-out oil cylinder (7) to work through the first oil cylinder oil path (110) and the second oil cylinder oil path (111), the power head rotating motor (1) is connected with the first main oil path through the first rotating oil path (14) and connected with the second main oil path through the second rotating oil path (15), and the power head rotating motor (1) drives the follow-up motor (2) to work on the feeding and returning oil pipe through the power box (10); When the feed pull-out cylinder (7) needs to be fed with a buckle, the second reversing valve (6) is powered to reverse, the power head rotary motor (1) is turned on, the input shaft (11) of the power box (10) is driven to rotate, and at the same time, the follow-up motor (2) is driven to rotate through the intermediate shaft (12), the first main oil circuit is fed with oil, the second main oil circuit is returned to oil, the first oil pipe (20) is fed with oil, the second oil pipe (21) is fed with oil, the hydraulic control one-way valve (8) seals the oil circuit, and the oil driven by the follow-up motor (2) to feed the pull-out cylinder (7) is prevented from flowing back to the normal control external oil circuit through the first cylinder oil circuit (110) and the second cylinder oil circuit (111), the first main oil circuit is connected with the first rotary oil circuit (14) and the second control oil pipe (61), the second main oil circuit is connected with the second rotary oil circuit (15) and the first control oil pipe (60), and since the oil in the first main oil circuit is high-pressure oil, the second reversing valve (6) is connected with the first reversing valve (5) through the first control oil pipe (60) and the second control oil pipe (61), so that the first reversing valve (5) is switched to the follow-up feeding working position, at this time, the second oil pipe (21) and the second cylinder oil pipe (51) are connected with the external oil return pipe, the first oil pipe (20) and the first cylinder oil pipe (50) are connected with the external oil return pipe at the same time, that is, the follow-up motor (2) supplies oil to the feed pull-out cylinder (7), so that the feed pull-out cylinder (7) feeds the upper buckle, that is, the feed pull-out cylinder (7) drives the entire power box (10) to feed; When the feed pull-out cylinder (7) needs to be fed with a buckle, the second reversing valve (6) is powered to reverse, the power head rotary motor (1) is turned on, the input shaft (11) of the power box (10) is driven to rotate, and at the same time, the follow-up motor (2) is driven to rotate through the intermediate shaft (12), the first main oil circuit is fed with oil, the second main oil circuit is returned to oil, the first oil pipe (20) is fed with oil, the second oil pipe (21) is fed with oil, the hydraulic control one-way valve (8) seals the oil circuit, and the oil driven by the follow-up motor (2) to feed the pull-out cylinder (7) is prevented from flowing back to the normal control external oil circuit through the first cylinder oil circuit (110) and the second cylinder oil circuit (111), the first main oil circuit is connected with the first rotary oil circuit (14) and the second control oil pipe (61), the second main oil circuit is connected with the second rotary oil circuit (15) and the first control oil pipe (60), and since the oil in the first main oil circuit is high-pressure oil, the second reversing valve (6) is connected with the first reversing valve (5) through the first control oil pipe (60) and the second control oil pipe (61), so that the first reversing valve (5) is switched to the follow-up feeding working position, at this time, the second oil pipe (21) and the second cylinder oil pipe (51) are connected with the external oil return pipe, the first oil pipe (20) and the first cylinder oil pipe (50) are connected with the external oil return pipe at the same time, that is, the follow-up motor (2) supplies oil to the feed pull-out cylinder (7), so that the feed pull-out cylinder (7) feeds the upper buckle, that is, the feed pull-out cylinder (7) drives the entire power box (10) to feed; Thus, the output shaft (13) is rotated while moving, so that the threaded connection of the drill pipe is conveniently connected and disconnected.

4. The method of using an automatic make and break feed system for a drilling rig as defined in claim 3, wherein, Further comprising the following steps: In the follow-up feed drilling pipe, the initial thread angle can not be just right, so there will be a small thread angle deviation of less than a buckle distance in the follow-up feed process, which will cause the thread to be stuck. Through the setting of the accumulator (4), when the thread angle deviation causes the thread to be stuck, the required feed driving force will gradually increase, and the pressure of the second oil port of the follow-up motor (2) will also increase. The accumulator (4) starts to store the hydraulic oil of the second oil port of the follow-up motor (2), thereby starting to compensate for the thread angle deviation and eliminating the thread sticking phenomenon when the thread is screwed up. Through the setting of the pressure relief valve (3), the maximum follow-up feed pulling force during automatic make and break is ensured; Through the setting of the pressure relief valve (3) and the accumulator (4), the rigidity operation during automatic make and break is reduced, the linear error during follow-up make and break is compensated, flexible make and break is realized, thereby protecting the drill pipe thread buckle and reducing wear and tear.

5. A method of using an automatic make and break feed system for a drilling rig as claimed in claim 3 or 4, characterised in that: The speed of the feed pulling cylinder in the feed direction is linearly proportional to the speed of the follow-up motor, and the speed of the follow-up motor is in a constant ratio transmission with the output shaft of the power box, so the speed of the feed pulling during the follow-up make and break is in a positive proportional linear relationship with the speed of the drill pipe of the power head, and the mathematical model formula is: wherein: The transmission speed ratio i1 between the input shaft of the power box and the intermediate shaft, the transmission speed ratio i2 between the intermediate shaft and the output shaft of the power box; the input shaft speed S1 of the power box, the intermediate shaft speed S2, the output shaft speed S3 of the power box; drill pipe thread pitch L; follow-up motor displacement V, feed pulling cylinder ring area A.

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