CN109751402B - Vehicle-mounted coalbed methane drill power head reduction gearbox - Google Patents
Vehicle-mounted coalbed methane drill power head reduction gearbox Download PDFInfo
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- CN109751402B CN109751402B CN201910048243.5A CN201910048243A CN109751402B CN 109751402 B CN109751402 B CN 109751402B CN 201910048243 A CN201910048243 A CN 201910048243A CN 109751402 B CN109751402 B CN 109751402B
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Abstract
The application discloses a vehicle-mounted coalbed methane drill head reduction gearbox which comprises a box body, a box cover, a main shaft, a driven gear and a detachable and replaceable slurry sealing device, wherein the box body is provided with a box cover and a box cover; the slurry sealing device is coaxial with the main shaft and is arranged on the upper end surface of the main shaft and used for sealing high-pressure slurry in the hollow main shaft; the slurry sealing device comprises a wear-resistant pipe, a static sealing structure and a dynamic sealing structure; the abrasion-resistant pipe is fixedly connected with the static sealing structure, the dynamic sealing structure is fixedly connected to the upper end of the main shaft, the dynamic sealing structure is rotationally connected with the abrasion-resistant pipe, and in the drilling operation process, the main shaft drives the dynamic sealing structure to rotate around the abrasion-resistant pipe of the static sealing structure, so that high-pressure slurry at the rotating/non-rotating position is sealed. The support cylinder is provided with an installation opening for taking and placing the slurry sealing device, so that the slurry sealing device is convenient to replace. The three groups of bearings are adopted to respectively transmit the torsion, lifting force and downward pressure during working, and the structure is simple and practical.
Description
Technical Field
The application belongs to the technical field of engineering equipment, and relates to a vehicle-mounted coalbed methane drill head reduction gearbox.
Background
Compared with the traditional vertical shaft type and rotary table type drilling machine, the vehicle-mounted coalbed methane drilling machine adopting the full hydraulic power head has the advantages that the working performance and the efficiency are obviously improved, and the vehicle-mounted coalbed methane drilling machine is rapidly developed in the domestic market in recent years.
The prior art has the following defects: 1. good sealing of the interior of the power head cannot be well achieved, so that high-pressure slurry is prevented from leaking from the rotating/non-rotating position of the upper end part of the main shaft of the power head, and the power head is scrapped; 2. the existing sealing device is a non-independent module, the sealing element is replaced and is required to be operated on the whole drilling machine, the connecting flange at the top end of the sealing element and a mud pipeline on the connecting flange are required to be detached, the wear-resistant pipe assembly is detached, and the detachment process is time-consuming and labor-consuming.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the application provides a vehicle-mounted coalbed methane drill head reduction gearbox. The self-sealing type modular sealing device has the advantages that the structure is simple, the self-sealing type modular sealing device is arranged, the sealing element can be conveniently and rapidly replaced while effective sealing is realized, and the operation efficiency is greatly improved.
The technical scheme is as follows: in order to solve the technical problems, the application adopts the following technical scheme:
a power head reduction gearbox comprises a box body, a box cover, a main shaft, a driven gear and a detachable and replaceable slurry sealing device;
the box body is rotationally provided with a main shaft for outputting power of the reduction box, and the driven gear is coaxially and fixedly connected with the main shaft to transmit rotary power to the main shaft;
the slurry sealing device is coaxial with the main shaft and is arranged on the upper end surface of the main shaft and used for sealing high-pressure slurry in the hollow main shaft;
the slurry sealing device comprises a wear-resistant pipe, a static sealing structure and a dynamic sealing structure; the abrasion-resistant pipe is fixedly connected with the static sealing structure, the dynamic sealing structure is fixedly connected to the upper end of the main shaft, the dynamic sealing structure is rotationally connected with the abrasion-resistant pipe, and in the drilling operation process, the main shaft drives the dynamic sealing structure to rotate around the abrasion-resistant pipe of the static sealing structure, so that high-pressure slurry at a rotating/non-rotating position is sealed.
The box cover is detachably and fixedly connected with the upper end face of the box body; the box cover is fixedly connected with a supporting cylinder coaxial with the main shaft, the supporting cylinder is of a cylindrical structure, and a mounting opening for taking and placing the slurry sealing device is formed in the supporting cylinder.
The slurry sealing device is of a self-sealing and modularized structure, and the upper end and the lower end of the slurry sealing device are trapezoidal threads and can be fixedly connected with the upper end of the main shaft and the inner side threads of the upper end of the supporting cylinder respectively. When the sealing element in the slurry sealing device needs to be replaced, the slurry sealing device can be taken out from the mounting opening on the supporting cylinder only by unscrewing the screw thread.
Further, the static sealing structure comprises an upper packing box gland, a first O-shaped sealing ring, an upper sealing pressing sleeve, packing, a check ring and an upper packing box; the upper packing box pressing cover is in threaded connection with the inner side of the upper end of the supporting cylinder, the packing and the upper sealing pressing sleeve are sequentially arranged in the upper packing box, the wear-resisting pipe and the upper sealing pressing sleeve are fixedly connected in the circumferential direction by adopting rectangular splines, the retainer ring is arranged in an annular clamping groove of the wear-resisting pipe, and the wear-resisting pipe is prevented from falling from the static sealing structure; the first O-shaped sealing ring is arranged in an annular groove on the upper end face of the upper sealing pressing sleeve and forms end face static seal with the end face of the supporting cylinder.
Further, the dynamic sealing structure comprises a packing, a lower packing box, a lower sealing pressing sleeve, a lower packing box pressing cover, a second O-shaped sealing ring, screws and an oil cup; the gland of the lower packing box is connected with the upper end of the main shaft through threads, the packing and the lower sealing pressing sleeve are sequentially arranged in the lower packing box, an oil cup is arranged on the lower packing box and used for periodically lubricating a dynamic sealing structure, a screw circumference is arranged on the lower packing box and is clamped into an annular groove of the lower sealing pressing sleeve, and packing and the lower sealing pressing sleeve are prevented from falling out of the lower packing box in the assembly process; the second O-shaped sealing ring is arranged in an end surface ring groove of the lower sealing pressing sleeve and forms end surface static seal with the end surface of the main shaft.
In the static sealing structure and the dynamic sealing structure, the number of the packing can be adjusted according to the requirement, one or more packing rings can be arranged among the packing rings.
After the vehicle-mounted coalbed methane drilling machine works for a period of time, packing has certain abrasion, so that the sealing performance is reduced, at the moment, the compression amount of the packing is adjusted by sequentially screwing the upper packing box gland and the lower packing box gland, and the service lives of the static sealing structure and the dynamic sealing structure are prolonged.
As a preferred scheme, the power head reduction gearbox further comprises a first bearing, wherein the first bearing is fixedly arranged between the main shaft and the box cover, a first bearing seat is arranged on the box cover, an inner ring of the first bearing is fixedly connected with the main shaft, and an outer ring of the first bearing is clamped and fixed on the first bearing seat on the inner side of the box cover; the torque force is born by the box cover during working so as to straighten the main shaft and improve the rotation stability;
the second bearing is fixedly arranged at the middle upper part between the main shaft and the box body, the driven gear is close to the upper part of the second bearing, a second bearing seat is arranged at the middle upper part in the box body, the inner ring of the second bearing is fixedly connected with the main shaft, and the outer ring of the second bearing is fixedly clamped at the second bearing seat at the inner side of the box body; to bear the downward pulling force of the drilling tool installed on the spindle through the box body;
the device comprises a main shaft, a box body, a first bearing, a second bearing, a third bearing, a first bearing and a second bearing, wherein the first bearing is fixedly arranged at the lower part between the main shaft and the box body; to bear upward pressure of a drilling tool mounted on the spindle through the housing.
The power head reduction gearbox further comprises a hydraulic motor, the hydraulic motor provides power for rotation of the main shaft, a variable speed transmission mechanism is arranged between the main shaft and the hydraulic motor and comprises a driving gear coaxially and fixedly connected with an output shaft of the hydraulic motor and a driven gear coaxially and fixedly connected with the main shaft, the driving gear is meshed with the driven gear, and the driving gear and the driven gear are located in the gearbox body.
Further, the main shaft is sleeved with a pressing plate for pressing the driven gear, the pressing plate is in threaded connection with the outer wall of the main shaft, and in the axial direction of the main shaft, the pressing plate is fixedly connected with the driven gear by bolts and is used for preventing the driven gear from axially moving;
further, the hydraulic motor is installed on the box cover in a connecting mode, and the hydraulic motor is installed in parallel with the main shaft.
The power head reduction gearbox further comprises an upper sealing structure and a lower sealing structure, wherein the upper sealing structure and the lower sealing structure are coaxial with the main shaft and are respectively arranged at the upper end position and the lower end position of the gearbox body and used for sealing gear oil in the gearbox body.
As a preferable scheme, an upper sealing structure is arranged at the upper end of the first bearing, and comprises a bearing cover plate, a first framework oil seal, a first spacer bush, a fourth O-shaped sealing ring and a third O-shaped sealing ring;
the bearing cover plate is fixedly connected with the box cover through bolts so as to compress the first bearing; two groups of first framework oil seals which are arranged back to back are arranged on the bearing cover plate, so that on one hand, external slurry or dust is prevented from entering the reduction gearbox to pollute gear oil, and on the other hand, the internal gear oil is prevented from exuding; the bearing cover plate and the box cover are sealed by a third O-shaped sealing ring so as to prevent the gear oil in the reduction box from seeping out from the space between the bearing cover plate and the box cover;
further, a first spacer bush is arranged between the first framework oil seal and the main shaft, so that the relative rotary seal between the main shaft and the first framework oil seal is converted into the relative rotary seal between the first spacer bush and the first framework oil seal; the first spacer bush is tightly matched and fixedly connected with the main shaft,
more preferably, a fourth O-shaped sealing ring is arranged between the first spacer bush and the main shaft so as to prevent the gear oil in the reduction gearbox from seeping out from between the first spacer bush and the main shaft.
Further, a mud umbrella is arranged on the main shaft at the position above the bearing cover plate.
And when slurry leakage occurs, slurry flows out from the slurry leakage port, so that the service life of the first framework oil seal is prolonged, and the slurry is prevented from entering the reduction gearbox from between the bearing cover plate and the first spacer bush.
As the preferable scheme, the power head reduction gearbox is characterized in that: the lower end of the box body is provided with a lower sealing structure, and the lower sealing structure comprises a lower end cover, a fifth O-shaped sealing ring, a second framework oil seal and a felt ring;
the lower end cover is fixedly connected with the box body by bolts, and two groups of second framework oil seals which are installed in the same direction are arranged on the lower end cover and are used for sealing gear oil in the reduction box body; the lower end cover and the box body are sealed by a fifth O-shaped sealing ring so as to prevent the gear oil in the reduction box body from seeping out from the lower end cover and the box body; the lower end cover is provided with a felt ring for preventing external mud or dust from entering the reduction gearbox to pollute gear oil.
Further, a second spacer bush is arranged between the second framework oil seal and the main shaft, so that the relative rotary seal between the main shaft and the second framework oil seal is converted into the relative rotary seal between the second spacer bush and the second framework oil seal; the second spacer bush is fixedly connected with the main shaft in a tight fit manner;
more preferably, a sixth O-shaped sealing ring is arranged between the second spacer bush and the main shaft so as to prevent the gear oil in the reduction gearbox from seeping out from between the second spacer bush and the main shaft.
As a preferable scheme, the power head reduction gearbox is provided with a magnetic screw plug for magnetically sucking waste residues in the reduction gearbox and discharging waste oil when gear oil in the reduction gearbox is replaced.
As a preferable scheme, an observation window is arranged at a position on the box body corresponding to the driven gear so as to facilitate observation of the gear oil level in the reduction box body during oiling.
As a preferable scheme, a screw plug is arranged on the upper end surface of the box cover to replace gear oil in the reduction box body, and new oil is added.
As a preferable scheme, a ventilator is arranged on the upper end surface of the box cover and used for releasing high-temperature gas generated during the operation of the power head reduction gearbox.
On the other hand, the application also provides a vehicle-mounted coalbed methane drilling machine, which is characterized by comprising the power head reduction gearbox.
The beneficial effects are that: the vehicle-mounted coalbed methane drill power head reduction gearbox provided by the application is provided with the self-sealing type modularized sealing device, so that the sealing element can be conveniently and rapidly replaced while effective sealing is realized, and the operation efficiency is greatly improved. Has the following advantages:
(1) The vehicle-mounted coalbed methane drill head reduction box adopts a self-sealing modularized slurry sealing device, is simple in structure, is provided with a mounting port for taking and placing the slurry sealing device, is connected with detachable threads, is convenient and quick to replace sealing elements, and can adjust the compression amount of the sealing elements and prolong the sealing life.
(2) The vehicle-mounted coalbed methane drill power head reduction box adopts three groups of bearings to respectively transmit torque force, lifting force and downward pressure during working, and has a simple and practical structure.
(3) The vehicle-mounted coalbed methane drill power head reduction gearbox adopts an upper sealing structure and a lower sealing structure to seal gear oil in the power head reduction gearbox, and adopts the spacer bush to convert the relative rotary motion between the framework oil seal and the main shaft into the relative rotary motion of the spacer bush and the framework oil seal, so that the service life of the main shaft is effectively prolonged, and the cost for replacing the main shaft is reduced.
Drawings
FIG. 1 is a cross-sectional view of a reduction gearbox of a vehicle-mounted coalbed methane drill head according to an embodiment;
FIG. 2 is a front view of a reduction gearbox of a vehicle-mounted coalbed methane drill head according to an embodiment;
FIG. 3 is a top view of a vehicle-mounted coalbed methane drill head reduction gearbox according to an embodiment;
FIG. 4 is a partial cross-sectional view of an embodiment of a slurry seal;
FIG. 5 is a partial cross-sectional view of an upper seal structure of an embodiment;
FIG. 6 is a partial cross-sectional view of a lower seal structure of an embodiment;
in the figure: the device comprises a box body 1, a box cover 2, a main shaft 3, an upper sealing structure 4, a hydraulic motor 5, a slurry sealing device 6, a supporting cylinder 7, a slurry umbrella 8, a first bearing 9, a pressure plate 10, a driving gear 11, a driven gear 12, a second bearing 13, a third bearing 14, a lower sealing structure 15, an observation window 16, a mounting opening 17, a screw plug 18, a ventilator 19 and a magnetic screw plug 20;
the device comprises a bearing cover plate 4-1, a first framework oil seal 4-2, a first spacer bush 4-3, a fourth O-shaped sealing ring 4-4, a slurry leakage port 4-5 and a third O-shaped sealing ring 4-6;
the packing box comprises an upper packing box gland 6-1, a first O-shaped sealing ring 6-2, an upper sealing sleeve 6-3, a packing 6-4, a retainer ring 6-5, a wear-resistant pipe 6-6 and an upper packing box 6-7; the sealing device comprises, by weight, a lower packing box 6-8, a spacer ring 6-9, a lower sealing pressing sleeve 6-10, a lower packing box pressing cover 6-11, a second O-shaped sealing ring 6-12, a screw 6-13 and an oil cup 6-14;
the lower end cover 15-1, the fifth O-shaped sealing ring 15-2, the second framework oil seal 15-3, the second spacer bush 15-4, the sixth O-shaped sealing ring 15-5 and the felt ring 15-6.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1, the vehicle-mounted coalbed methane drill head reduction gearbox mainly comprises a box body 1, a box cover 2, a main shaft 3, an upper sealing structure 4, a hydraulic motor 5, a slurry sealing device 6, a supporting cylinder 7 and a lower sealing structure 15. The upper sealing structure 4 and the lower sealing structure 15 are coaxial with the main shaft 3 and are respectively arranged at the upper end position and the lower end position of the main shaft 3 for sealing gear oil in the box body 1. The slurry sealing device 6 is coaxial with the main shaft 3 and is installed on the upper end surface of the main shaft 3 for sealing high-pressure slurry in the hollow main shaft 3.
In some embodiments, as shown in fig. 1, the upper plane of the box body 1 is fixedly connected with a box cover 2 by bolts, the box body 1 is rotatably provided with a main shaft 3 for outputting power of the reduction gearbox, and the box cover 2 is fixedly connected with a hydraulic motor 5 which is installed in parallel with the main shaft 3 by bolts.
As shown in fig. 1, a variable speed transmission mechanism is arranged between the main shaft 3 and the hydraulic motor 5, and the variable speed transmission mechanism comprises a driving gear 11 coaxially and fixedly connected with an output shaft of the hydraulic motor 5 and a driven gear 12 coaxially and fixedly connected with the main shaft 3.
The number of the hydraulic motors 5 is M, M is an even number, and m=4 in this embodiment.
The hydraulic motor 5 is a double-row cycloid motor, can realize high-gear and low-gear speed change, outputs low-speed large torque in low gear to meet the requirements of drilling or drilling hard rock, and outputs high-speed small torque in high gear to meet the normal operation requirements.
Under the drilling operation working condition of the vehicle-mounted coalbed methane drilling machine, the transmission path of the torque of the power head reduction gearbox is that after the power of the drilling machine is provided for the hydraulic motor 5, the power is transmitted to the driven gear 12 through the driving gear 11 and then is transmitted to the main shaft 3 which is fixedly connected with the driven gear 12 in a coaxial way, and finally the power is output to a drilling tool connected with the main shaft 3.
As shown in fig. 1 and 2, the bolt on the cover 2 is fixedly connected with a supporting cylinder 7 coaxial with the main shaft 3, the supporting cylinder 7 has a cylindrical structure, and a mounting opening 17 for taking and placing the slurry sealing device 6 is formed in the supporting cylinder 7.
The slurry sealing device 6 is of a self-sealing and modularized structure, and the upper end and the lower end of the slurry sealing device are trapezoidal threads and can be fixedly connected with the upper end of the main shaft 3 and the inner side threads of the upper end of the supporting cylinder 7 respectively. When the sealing element in the slurry sealing device 6 needs to be replaced, the slurry sealing device 6 can be taken out from the mounting opening 17 on the supporting cylinder 7 only by unscrewing the screw thread.
In some embodiments, as shown in fig. 4, the slurry seal means 6 comprises a static seal arrangement and a dynamic seal arrangement. The static sealing structure comprises an upper packing box gland 6-1, a first O-shaped sealing ring 6-2, an upper sealing pressing sleeve 6-3, a packing 6-4, a retainer ring 6-5, a wear-resistant pipe 6-6 and an upper packing box 6-7. The dynamic sealing structure comprises a packing 6-4, a lower packing box 6-8, a spacing ring 6-9, a lower sealing pressing sleeve 6-10, a lower packing box gland 6-11, a second O-shaped sealing ring 6-12, a screw 6-13 and an oil cup 6-14.
More specifically, the static seal structure is characterized in that: the upper packing box gland 6-1 is installed on the inner side of the upper end of the supporting cylinder 7 in a trapezoid threaded connection mode, the packing 6-4 and the upper sealing pressing sleeve 6-3 are installed in the upper packing box 6-7 in sequence, the abrasion-resistant pipe 6-6 and the upper sealing pressing sleeve 6-3 are fixedly connected in the circumferential direction through rectangular splines, the retainer ring 6-5 is installed in an annular clamping groove of the abrasion-resistant pipe 6-6, and the abrasion-resistant pipe 6-6 is prevented from falling from the static sealing structure. The first O-shaped sealing ring 6-2 is arranged in an annular groove on the upper end face of the upper sealing pressing sleeve 6-3, and forms end face static seal with the end face of the supporting cylinder 7.
More specifically, the dynamic seal structure is characterized in that: the lower packing box gland 6-11 is installed at the upper end of the main shaft 3 in a trapezoid threaded connection mode, the packing 6-4 and the lower sealing pressing sleeve 6-10 are sequentially installed in the lower packing box 6-8, the oil cup 6-14 is installed on the lower packing box 6-8 and used for regularly lubricating the sealing structure, the screw 6-13 circumference is installed on the lower packing box 6-8 and clamped into an annular groove of the lower sealing pressing sleeve 6-10, and the packing 6-4, the spacing ring 6-9 and the lower sealing pressing sleeve 6-10 are prevented from falling out of the lower packing box 6-8 in the assembly process. The second O-shaped sealing ring 6-12 is arranged in an end surface ring groove of the lower sealing pressing sleeve 6-10 and forms end surface static seal with the end surface of the main shaft 3.
In the static sealing structure and the dynamic sealing structure, the number of the packing 6-4 is adjusted according to the requirement, one or more packing 6-4 are arranged, and a spacing ring 6-9 is arranged between the packing 6-4 and used for spacing the adjacent packing 6-4.
In the dynamic seal structure, the number of the screws 6-13 is N, in this embodiment, n=2.
In the drilling operation process of the vehicle-mounted coalbed methane drilling machine, the main shaft 3 drives the dynamic sealing structure to rotate around the abrasion-resistant pipe 6-6 of the static sealing structure, so that high-pressure slurry at the rotating/non-rotating position is sealed.
After the vehicle-mounted coalbed methane drilling machine works for a period of time, the packing 6-4 is worn to a certain extent, so that the sealing performance is reduced, and at the moment, the compression amount of the packing 6-4 can be adjusted by sequentially screwing the upper packing box gland 6-1 and the lower packing box gland 6-11, so that the sealing service life is prolonged.
In some embodiments, as shown in fig. 1, the spindle 3 is sleeved with a pressing plate 10 for pressing the driven gear 12, the pressing plate 10 is in threaded connection with the outer wall of the spindle 3, and in the axial direction of the spindle 3, the pressing plate 10 is fixedly connected with the driven gear 12 by bolts, so as to prevent the driven gear 12 from axially moving.
In some embodiments, as shown in fig. 1, a first bearing 9 is fixedly installed between the main shaft 3 and the case cover 2, a first bearing seat is arranged on the case cover 2, an inner ring of the first bearing 9 is fixedly connected with the main shaft 3, and an outer ring of the first bearing 9 is clamped and fixed on the first bearing seat inside the case cover 2; so as to enlarge the bearing spacing to the maximum extent, bear the torsion force during working through the box cover 2, centralize the main shaft 3, improve the rotation stability and prolong the service life of the sealing element. The second bearing 13 is fixedly arranged at the middle upper part between the main shaft 3 and the box body 1 and is close to the lower part of the driven gear 12, a second bearing seat is arranged at the middle upper part in the box body 1, the inner ring of the second bearing 13 is fixedly connected with the main shaft 3, and the outer ring of the second bearing 13 is fixedly clamped at the second bearing seat at the inner side of the box body 1; to bear downward pulling force of a drilling tool mounted on the spindle 3 through the housing 1 to bear vertical downward force. The third bearing 14 is fixedly arranged at the lower part between the main shaft 3 and the box body 1, a third bearing seat is arranged at the lower part in the box body 1, the inner ring of the third bearing 14 is fixedly connected with the main shaft 3, and the outer ring of the third bearing 14 is fixedly clamped at the third bearing seat at the inner side of the box body 1; to bear upward pressure of a drilling tool mounted on the spindle 3 through the housing 1 to bear vertical upward force.
Under the lifting working condition of the vehicle-mounted coalbed methane drilling machine, a lifting force transmission path is that the main shaft 3 bears downward pulling force from a drilling tool, and the lifting force is transmitted to the driven gear 12 and the second bearing 13 through the pressure plate 10 in threaded connection with the main shaft 3, and is finally born by the box body 1.
Under the working condition of the downward pressing operation of the vehicle-mounted coalbed methane drilling machine, the downward pressure transmission path is that the main shaft 3 bears upward pressure from a drilling tool, and the upward pressure is transmitted to the box body 1 through the end face of the main shaft 3, which is in contact with the third bearing 14.
As shown in fig. 1 and 5, the upper end of the first bearing 9 is provided with an upper sealing structure 4, which comprises a bearing cover plate 4-1, a first framework oil seal 4-2, a first spacer bush 4-3, a fourth O-shaped sealing ring 4-4, a slurry leakage port 4-5 and a third O-shaped sealing ring 4-6. The bearing cover plate 4-1 is fixedly connected with the box cover 2 by bolts so as to compress the first bearing 9. The bearing cover plate 4-1 is provided with two groups of first framework oil seals 4-2 which are arranged back to back, so that on one hand, external slurry or dust is prevented from entering the reduction gearbox to pollute gear oil, and on the other hand, the internal gear oil is prevented from exuding. The bearing cover plate 4-1 and the box cover 2 are sealed by a third O-shaped sealing ring 4-6 to prevent the gear oil in the reduction box from seeping out between the bearing cover plate and the box cover 2.
After the upper sealing structure 4 works for a period of time, at the joint surface of the first framework oil seal 4-2 and the main shaft 3, the first framework oil seal 4-2 can generate certain abrasion to the rotating main shaft 3, so that the risk of slurry feeding or oil leakage is caused. In the embodiment, the first spacer bush 4-3 is arranged between the first framework oil seal 4-2 and the main shaft 3, so that the relative rotary seal between the main shaft 3 and the first framework oil seal 4-2 is converted into the relative rotary seal between the first spacer bush 4-3 and the first framework oil seal 4-2, and after the first framework oil seal 4-2 wears the first spacer bush 4-3, only the first spacer bush 4-3 needs to be replaced, thereby prolonging the service life of the main shaft 3 and reducing the production cost. The first spacer bush 4-3 is tightly matched and fixedly connected with the main shaft 3, and a fourth O-shaped sealing ring 4-4 is arranged between the first spacer bush 4-3 and the main shaft 3 to prevent the gear oil in the reduction gearbox from seeping out from between the first spacer bush 4-3 and the main shaft 3.
As shown in fig. 1 and 5, a slurry umbrella 8 is installed on the main shaft 3 at a position above the bearing cover plate 4-1, and a slurry leakage port 4-5 is arranged on the supporting cylinder 7. When slurry leakage occurs, slurry can flow out from the slurry leakage port 4-5, so that the service life of the first framework oil seal 4-2 is prolonged, and impurities such as slurry are prevented from entering the reduction gearbox from the position between the bearing cover plate 4-1 and the first spacer bush 4-3.
As shown in fig. 1 and 6, the lower end of the box body 1 is provided with the lower sealing structure 15, which comprises a lower end cover 15-1, a fifth O-shaped sealing ring 15-2, a second framework oil seal 15-3, a second spacer bush 15-4, a sixth O-shaped sealing ring 15-5 and a felt ring 15-6. The lower end cover 15-1 is fixedly connected with the box body 1 by bolts, and the lower end cover 15-1 is provided with two groups of second framework oil seals 15-3 which are installed in the same direction and are used for sealing gear oil in the reduction box body. The lower end cover 15-1 and the box body 1 are sealed by adopting a fifth O-shaped sealing ring 15-2 so as to prevent the gear oil in the reduction box body from seeping out from the lower end cover and the box body 1. The lower end cover 15-1 is provided with a Mao Zhanjuan 15-6 for preventing external mud or dust from entering the reduction gearbox to pollute gear oil.
In order to prolong the service life of the main shaft 3 and reduce the cost brought by replacing the main shaft 3, a second spacer bush 15-4 is arranged between the second framework oil seal 15-3 and the main shaft 3, so that the relative rotary seal between the main shaft 3 and the second framework oil seal 15-3 is converted into the relative rotary seal between the second spacer bush 15-4 and the second framework oil seal 15-3, and after the second framework oil seal 15-3 wears the second spacer bush 15-4, only the second spacer bush 15-4 needs to be replaced. The second spacer bush 15-4 is fixedly connected with the main shaft 3 in a tight fit manner. A sixth O-ring 15-5 is arranged between the second spacer 15-4 and the main shaft 3 to prevent the gear oil in the reduction gearbox from seeping out from between the second spacer and the main shaft.
As shown in fig. 2, a magnetic screw plug 20 is installed on the box 1 to magnetically attract waste residues in the reduction box and discharge waste oil when gear oil in the reduction box is replaced; meanwhile, an observation window 16 is arranged on the box body 1 at a position corresponding to the driven gear 12 so as to facilitate observation of the gear oil level in the reduction box body during initial oiling.
As shown in fig. 3, on the upper end surface of the case cover 2, a screw plug 18 is installed to replace gear oil in the reduction gearbox, and a ventilator 19 is installed to release high temperature gas generated when the reduction gearbox of the power head works.
The vehicle-mounted coalbed methane drill power head reduction box provided by the application has a simple structure, is provided with the self-sealing type and modularized sealing device, can conveniently and rapidly replace a sealing element while realizing effective sealing, and greatly improves the operation efficiency. Has the following advantages:
(1) The vehicle-mounted coalbed methane drill power head reduction box adopts a self-sealing modularized slurry sealing device, has a simple structure, is convenient and quick to replace sealing elements, can adjust the compression amount of the sealing elements, and prolongs the sealing life.
(2) The vehicle-mounted coalbed methane drill power head reduction gearbox adopts an upper sealing structure and a lower sealing structure to seal gear oil in the power head reduction gearbox, and adopts the spacer bush to convert the relative rotary motion between the framework oil seal and the main shaft into the relative rotary motion of the spacer bush and the framework oil seal, so that the service life of the main shaft is effectively prolonged, and the cost for replacing the main shaft is reduced.
(3) The vehicle-mounted coalbed methane drill power head reduction box adopts three groups of bearings to transmit torque force, lifting force and downward pressure during working, and is simple and practical in structure.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present application.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.
Claims (16)
1. The utility model provides a unit head reducing gear box which characterized in that: comprises a box body, a box cover, a main shaft, a driven gear and a detachable and replaceable slurry sealing device;
the box body is rotationally provided with a main shaft for outputting power of the reduction box, and the driven gear is coaxially and fixedly connected with the main shaft to transmit rotary power to the main shaft; the slurry sealing device is coaxial with the main shaft and is arranged on the upper end surface of the main shaft and used for sealing high-pressure slurry in the hollow main shaft;
the slurry sealing device comprises a wear-resistant pipe, a static sealing structure and a dynamic sealing structure; the abrasion-resistant pipe is fixedly connected with the static sealing structure, the dynamic sealing structure is fixedly connected to the upper end of the main shaft, the dynamic sealing structure is rotationally connected with the abrasion-resistant pipe, and in the drilling operation process, the main shaft drives the dynamic sealing structure to rotate around the abrasion-resistant pipe of the static sealing structure, so that high-pressure slurry at a rotating/non-rotating position is sealed;
the box cover is detachably and fixedly connected with the upper end face of the box body; a supporting cylinder coaxial with the main shaft is fixedly connected to the box cover; the novel spindle motor is characterized by further comprising a first bearing, wherein the first bearing is fixedly arranged between the spindle and the box cover, a first bearing seat is arranged on the box cover, an inner ring of the first bearing is fixedly connected with the spindle, and an outer ring of the first bearing is clamped and fixed on the first bearing seat on the inner side of the box cover; the torque force is born by the box cover during working so as to straighten the main shaft and improve the rotation stability; the second bearing is fixedly arranged at the middle upper part between the main shaft and the box body, the driven gear is close to the upper part of the second bearing, a second bearing seat is arranged at the middle upper part in the box body, the inner ring of the second bearing is fixedly connected with the main shaft, and the outer ring of the second bearing is fixedly clamped at the second bearing seat at the inner side of the box body; to bear the downward pulling force of the drilling tool installed on the spindle through the box body; the device comprises a main shaft, a box body, a first bearing, a second bearing, a third bearing, a first bearing and a second bearing, wherein the first bearing is fixedly arranged at the lower part between the main shaft and the box body; to bear upward pressure of a drilling tool mounted on the spindle through a case;
the upper end and the lower end of the slurry sealing device are of a threaded structure and are respectively in threaded connection with the upper end of the main shaft and the upper end of the supporting cylinder; the static sealing structure comprises an upper packing box gland, a first O-shaped sealing ring, an upper sealing pressing sleeve, packing, a check ring and an upper packing box; the upper packing box pressing cover is in threaded connection with the inner side of the upper end of the supporting cylinder, the packing and the upper sealing pressing sleeve are sequentially arranged in the upper packing box, the wear-resisting pipe and the upper sealing pressing sleeve are fixedly connected in the circumferential direction by adopting rectangular splines, the retainer ring is arranged in an annular clamping groove of the wear-resisting pipe, and the wear-resisting pipe is prevented from falling from the static sealing structure; the first O-shaped sealing ring is arranged in an annular groove on the upper end surface of the upper sealing pressing sleeve and forms end surface static seal with the end surface of the supporting cylinder; the dynamic sealing structure comprises a packing, a lower packing box, a lower sealing pressing sleeve, a lower packing box pressing cover, a second O-shaped sealing ring, a screw and an oil cup; the gland of the lower packing box is connected with the upper end of the main shaft through threads, the packing and the lower sealing pressing sleeve are sequentially arranged in the lower packing box, an oil cup is arranged on the lower packing box and used for periodically lubricating a dynamic sealing structure, a screw circumference is arranged on the lower packing box and is clamped into an annular groove of the lower sealing pressing sleeve, and packing and the lower sealing pressing sleeve are prevented from falling out of the lower packing box in the assembly process; the second O-shaped sealing ring is arranged in an end surface ring groove of the lower sealing pressing sleeve and forms end surface static seal with the end surface of the main shaft;
an upper sealing structure is arranged at the upper end of the first bearing and comprises a bearing cover plate, a first framework oil seal, a first spacer bush and a third O-shaped sealing ring; the bearing cover plate is fixedly connected with the box cover through bolts so as to compress the first bearing; two groups of first framework oil seals which are arranged back to back are arranged on the bearing cover plate, so that on one hand, external slurry or dust is prevented from entering the reduction gearbox to pollute gear oil, and on the other hand, the internal gear oil is prevented from exuding; the bearing cover plate and the box cover are sealed by a third O-shaped sealing ring so as to prevent the gear oil in the reduction box from seeping out from the space between the bearing cover plate and the box cover; a first spacer bush is arranged between the first framework oil seal and the main shaft, so that the relative rotary seal between the main shaft and the first framework oil seal is converted into the relative rotary seal between the first spacer bush and the first framework oil seal; the first spacer bush is tightly matched and fixedly connected with the main shaft;
the lower end of the box body is provided with a lower sealing structure, and the lower sealing structure comprises a lower end cover, a fifth O-shaped sealing ring, a second framework oil seal and a felt ring; the lower end cover is fixedly connected with the box body by bolts, and two groups of second framework oil seals which are installed in the same direction are arranged on the lower end cover and are used for sealing gear oil in the reduction box body; the lower end cover and the box body are sealed by a fifth O-shaped sealing ring so as to prevent the gear oil in the reduction box body from seeping out from the lower end cover and the box body; the lower end cover is provided with a felt ring for preventing external mud or dust from entering the reduction gearbox to pollute gear oil; a second spacer bush is arranged between the second framework oil seal and the main shaft, so that the relative rotary seal between the main shaft and the second framework oil seal is converted into the relative rotary seal between the second spacer bush and the second framework oil seal; the second spacer bush is tightly matched and fixedly connected with the main shaft.
2. The powerhead reduction gearbox of claim 1, wherein: the supporting cylinder is of a cylindrical structure, and an installation opening for taking and placing the slurry sealing device is formed in the supporting cylinder.
3. The powerhead reduction gearbox of claim 1, wherein: in the static sealing structure and the dynamic sealing structure, the number of packing is one or more, and a spacing ring is arranged among the packing.
4. The powerhead reduction gearbox of claim 1, wherein: the hydraulic motor provides power for the rotation of the main shaft, a variable speed transmission mechanism is arranged between the main shaft and the hydraulic motor, the variable speed transmission mechanism comprises a driving gear coaxially and fixedly connected with an output shaft of the hydraulic motor and a driven gear coaxially and fixedly connected with the main shaft, the driving gear is meshed with the driven gear, and the driving gear and the driven gear are located in a box body.
5. The powerhead reduction gearbox of claim 4, wherein: the main shaft cover is equipped with and is used for compressing tightly the pressure disk of driven gear, the pressure disk with main shaft outer wall threaded connection in main shaft axis direction, the pressure disk with driven gear adopts the bolt rigid coupling, is used for preventing driven gear axial float.
6. The power head reduction gearbox according to claim 4 or 5, wherein: the hydraulic motor is connected and installed on the box cover, and the hydraulic motor is installed in parallel with the main shaft.
7. The powerhead reduction gearbox of claim 1, wherein: the gear oil sealing device is characterized by further comprising an upper sealing structure and a lower sealing structure, wherein the upper sealing structure and the lower sealing structure are coaxial with the main shaft and are respectively arranged at the upper end position and the lower end position of the box body and used for sealing gear oil in the box body.
8. The powerhead reduction gearbox of claim 1, wherein: the upper sealing structure further comprises a fourth O-shaped sealing ring, and the fourth O-shaped sealing ring is arranged between the first spacer bush and the main shaft so as to prevent gear oil in the reduction gearbox from seeping out from between the first spacer bush and the main shaft.
9. The powerhead reduction gearbox of claim 1, wherein: and a mud umbrella is arranged on the main shaft at the position above the bearing cover plate.
10. The powerhead reduction gearbox of claim 1, wherein: and a slurry leakage port is arranged on the supporting cylinder and used for enabling slurry to flow out from the slurry leakage port when slurry leakage occurs, so that the service life of the first framework oil seal is prolonged, and the slurry is prevented from entering the reduction gearbox from the position between the bearing cover plate and the first spacer bush.
11. The powerhead reduction gearbox of claim 1, wherein: a sixth O-shaped sealing ring is arranged between the second spacer bush and the main shaft to prevent the gear oil in the reduction gearbox from seeping out from between the second spacer bush and the main shaft.
12. The powerhead reduction gearbox of claim 1, wherein: the box body is provided with a magnetic screw plug for magnetically sucking waste residues in the reduction box body and discharging waste oil when gear oil in the reduction box body is replaced.
13. The powerhead reduction gearbox of claim 1, wherein: an observation window is arranged at a position on the box body corresponding to the driven gear so as to observe the gear oil level in the reduction box body during oiling.
14. The powerhead reduction gearbox of claim 1, wherein: and a screw plug is arranged on the upper end surface of the box cover to replace gear oil in the reduction box body, and new oil is added.
15. The powerhead reduction gearbox of claim 1, wherein: and the upper end surface of the box cover is provided with a ventilator for releasing high-temperature gas generated during the operation of the power head reduction gearbox.
16. A vehicle-mounted coalbed methane drilling machine, characterized by comprising the power head reduction gearbox of any one of claims 1-15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910048243.5A CN109751402B (en) | 2019-01-18 | 2019-01-18 | Vehicle-mounted coalbed methane drill power head reduction gearbox |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910048243.5A CN109751402B (en) | 2019-01-18 | 2019-01-18 | Vehicle-mounted coalbed methane drill power head reduction gearbox |
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| CN109751402A CN109751402A (en) | 2019-05-14 |
| CN109751402B true CN109751402B (en) | 2023-10-03 |
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| CN201910048243.5A Active CN109751402B (en) | 2019-01-18 | 2019-01-18 | Vehicle-mounted coalbed methane drill power head reduction gearbox |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113124162B (en) * | 2019-12-31 | 2024-04-09 | 四川宏华石油设备有限公司 | Combined sealing structure for top drive |
| CN111486169B (en) * | 2020-04-03 | 2023-10-03 | 浙江大学 | Upper driving type main shaft complex for centrifugal supergravity device |
| CN111804212B (en) * | 2020-07-08 | 2021-10-26 | 北京中科富海低温科技有限公司 | Dewar device with magnetic stirring |
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