CN113738849A - Forced cooling lubrication maintenance-free type underground drill power head - Google Patents

Abstract

The invention discloses a forced cooling and lubricating maintenance-free type underground drill power head which comprises a shell, wherein a main shaft and a driving device for driving the main shaft to rotate are arranged on the shell, the main shaft rotates around the axis of the shell, a hollow chuck device for clamping the main shaft is sleeved outside the main shaft, the shell and the main shaft enclose to form a first cooling cavity communicated with an inner cavity of the chuck device, one of the chuck device and the shell is provided with a liquid inlet, the other one of the chuck device and the shell is provided with a liquid outlet, and the liquid inlet and the liquid outlet are both communicated with the first cooling cavity. This forced cooling lubrication exempts from to maintain type gallery rig unit head pours into the coolant liquid into to chuck device and first cooling chamber through annotating the liquid mouth, and the coolant liquid is discharged from the liquid outlet, takes away the heat and the piece impurity on chuck device, main shaft surface, realizes the cooling and the lubrication to the unit head, makes equipment inside keep clean and maintain in suitable temperature range, reduces the heat altered shape, guarantees sealed effect, makes equipment avoid enclosing to prolong its life by a wide margin.

Description

Forced cooling lubrication maintenance-free type underground drill power head

Technical Field

The invention relates to the technical field of power heads, in particular to a maintenance-free type power head of a tunnel drilling machine with forced cooling and lubrication.

Background

The underground drill power head mainly comprises two functional components, wherein one functional component is a speed reduction component and used for driving a main shaft to rotate, and the other functional component is an oil distribution component and used for clamping or loosening a drill rod through the movement of a slip.

The existing power head usually also can isolate a lubricated chuck component by utilizing a framework oil seal, so that lubricating oil is prevented from leaking. After the equipment runs for a long time, the framework oil seal and the slip seat are quickly heated due to friction, parts are easy to deform thermally, the sealing performance is weakened, and due to the severe use environment of the equipment, the occupational skill level of operators is uneven, the power head is frequently forgotten to be maintained on time or is not maintained properly, so that the service life of the power head is greatly shortened; the slip seat and the main shaft are easy to wear and need to be replaced regularly, so that the use cost of a customer is increased, the working efficiency is reduced, and the labor intensity of workers is increased; moreover, when the equipment runs, the chuck component is driven to vibrate by the vibration of the main shaft, so that the oil cylinder driving the chuck component to axially displace vibrates, and the use of an oil cylinder sealing element is shortened; in addition, in the existing power head, slips are usually fixed on a slip seat by screws, so that the assembly and disassembly operations are troublesome and are not beneficial to replacement.

Accordingly, there is a need for an improvement in the prior art excavation drill power head.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the maintenance-free power head of the forced cooling and lubricating underground drill rig, which has the advantages of prolonging the service life, ensuring the sealing effect, reducing the workload of workers, improving the working efficiency, reducing the use cost and conveniently replacing slips.

In order to realize the technical effects, the technical scheme of the invention is as follows: the utility model provides a forced cooling lubrication exempts from to maintain type gallery rig unit head, includes the casing, be provided with on the casing around its self axial lead pivoted main shaft and drive the rotatory drive arrangement of main shaft, the main shaft overcoat is equipped with and is used for the tight cavity form chuck device of its clamp, the casing with the main shaft encloses to close form with the first cooling chamber of chuck device inner chamber intercommunication, chuck device with one of casing is provided with the inlet, and another is provided with the liquid outlet, the inlet with the liquid outlet all with first cooling chamber intercommunication.

When the underground drill rig power head of the technical scheme is used, the driving device operates to drive the main shaft to rotate, and the drill rod is clamped by the chuck device; during the equipment operation, let in coolant liquid (being hydraulic oil usually) in annotating the liquid mouth, the coolant liquid flows in chuck device inside and first cooling chamber, then discharge from the liquid outlet, the coolant liquid is when chuck device inside and first cooling chamber flow, absorb the heat of main shaft and chuck device on the one hand, delay the programming rate, avoid high temperature down thermal deformation, thereby operation with equipment has been stabilized at a suitable temperature, extension device life, guarantee the leakproofness, meanwhile, the piece impurity that produces because relative friction has still been taken away to the in-process that the coolant liquid flows, further reduce the wearing and tearing of equipment, and when the coolant liquid is hydraulic oil, can also play lubricated effect to the operation of equipment. As mentioned above, the cooling effect on the power head is realized through flowing cooling liquid, chips generated during the operation of the equipment are taken away, the abrasion is reduced, the operation of the equipment is maintained at a stable and proper temperature, the influence of thermal deformation on the sealing performance and the service life of the equipment at a high temperature is avoided, the equipment is free from maintenance, the workload of workers is reduced, the working efficiency is improved, and the use cost of the equipment is reduced.

Preferably, the casing with still be provided with the cover between the chuck device and locate the outer bearing frame of main shaft, be provided with the cover on the bearing frame and locate the outer bearing of main shaft, the bearing frame with the main shaft encloses to close form with the chuck device inner chamber the second cooling chamber of first cooling chamber intercommunication.

Through adopting above-mentioned technical scheme, utilize the bearing support main shaft on the bearing frame to carry out stable rotation to inner chamber intercommunication through second cooling chamber and chuck device makes the coolant liquid can enter into between main shaft and the bearing frame, and the area of contact of increase coolant liquid and main shaft improves the cooling effect of main shaft, guarantees the steady operation of equipment.

Preferably, a first wear-resistant ring sleeved outside the main shaft is arranged between at least one of the housing and the bearing seat and the main shaft.

Through adopting above-mentioned technical scheme, utilize first wear-resisting ring can reduce the wearing and tearing to the main shaft, thereby reduce the replacement cost of part, the concrete expression is in, after the part wearing and tearing, only need change first wear-resisting ring, and need not to change this kind of expensive large-scale part of main shaft, the degree of difficulty of changing has been reduced on the one hand, thereby workman's change work load has been reduced, be favorable to improving labor efficiency, and on the other hand, need not to change the main shaft, only need change such little part of first wear-resisting ring, therefore, the replacement cost is low, customer's use cost has been reduced promptly.

Preferably, at least one of the housing and the bearing seat is provided with a flow guide spray hole, an oil inlet of the flow guide spray hole is communicated with the first cooling cavity, and an oil outlet of the flow guide spray hole faces the main shaft.

Through adopting above-mentioned technical scheme, utilize the flow direction of water conservancy diversion orifice guide coolant liquid for the coolant liquid flows in chuck device inside and first cooling chamber back, sprays on the main shaft through the water conservancy diversion through-hole, guarantees that the coolant liquid can take away the heat the very first time, further improves the cooling effect.

Preferably, first wear-resistant rings sleeved outside the main shaft are arranged between the housing and the bearing seat and between the main shaft and the bearing seat, flow guide spray holes are arranged on the housing and the bearing seat, and oil outlets of the flow guide spray holes face to a sealing contact surface of the first wear-resistant rings.

Through adopting above-mentioned technical scheme, further strengthened the wear resistance of main shaft, alleviate the maintenance cost, reduce workman's work load, improve work efficiency, in addition, the water conservancy diversion orifice of two places can guide the coolant liquid accuracy respectively to spray on two first wear-resisting rings, and this position is exactly the oil blanket friction and the department that generates heat, has further guaranteed that the coolant liquid can take away the heat and the piece that the friction produced in the very first time for the device is exempted from to maintain increase of service life.

Preferably, the plurality of guide spray holes are uniformly distributed on the circumference which takes the center of the cross section of the main shaft as the circle center.

By adopting the technical scheme, the cooling liquid can be uniformly sprayed on the first wear-resisting ring by utilizing the plurality of uniformly distributed flow guide spray holes, so that the multipoint simultaneous cooling is realized, the thermal deformation is balanced, and the service life of the wear-resisting ring is prolonged.

Preferably, chuck device locates including the cover the outer slip bowl of main shaft, set up in the slip bowl with at least three slips and drive between the main shaft the slip bowl is followed main shaft axial displacement's translation subassembly, the internal surface of slip bowl is for facing away from drive arrangement's flaring form or orientation drive arrangement's closing mouth form, the slips distribute in with main shaft cross section center is on the circumference of centre of a circle, slip bowl outer sealing sleeve is equipped with the bearing housing, the slip bowl with the bearing housing encloses to close and forms chuck device's inner chamber.

By adopting the technical scheme, after the main shaft rotates, the slip seat and the slips are driven to rotate to realize the rotating function, then the slip seat is driven to move by the translation assembly, and the slips are driven by the slip seat to move close to the main shaft along the radial direction of the main shaft by utilizing the design that the inner surface of the slip seat is in an expanding shape or a closing shape, so that the drill rod is clamped; the cooling liquid flows in the inner cavity formed by the slip seat and the bearing shell, so that the slip seat is cooled, the thermal deformation of the slip seat is prevented, and the service life of the slip seat is prolonged.

Preferably, a second wear-resistant ring which is sleeved outside the slip seat in a sealing manner is arranged between the bearing shell and the slip seat.

Through adopting above-mentioned technical scheme, utilize the wear-resisting ring of second to avoid the slip seat to receive wearing and tearing, after the wearing and tearing take place for the wear-resisting ring of second, only need change it, and need not to change the slip seat, consequently not only made things convenient for change work, alleviateed workman's work load, improved labor efficiency, alleviateed the replacement cost moreover, reduced use cost.

Preferably, the translation assembly comprises an oil cylinder, a cylinder barrel of the oil cylinder is fixedly connected with the shell, a spherical bulge is arranged at one end, connected with the bearing shell, of a piston rod of the oil cylinder, and a recess matched with the bulge is formed in one side, connected with the bulge, of the bearing shell.

By adopting the technical scheme, the vibration transmitted to the oil cylinder by the chuck device is reduced by utilizing the design of the matched spherical bulge and the matched recess, so that the service life of the oil cylinder sealing element is prolonged.

Preferably, the slips are fixedly connected with the slip seat through a magnetic suction piece.

Through adopting above-mentioned technical scheme, utilize magnetism to inhale the fixed connection that the piece realized between slip seat and the slips, compare in traditional screw mode that utilizes, this connected mode more is favorable to realizing the convenient dismantlement of slips and changing, reduces workman work load.

In conclusion, the maintenance-free type tunnel drilling machine power head with forced cooling and lubrication provided by the invention injects cooling liquid into the chuck device and the first cooling cavity through the liquid injection port, the cooling liquid is discharged from the liquid outlet to take away heat and debris impurities on the surfaces of the chuck device and the main shaft, so that the temperature reduction and lubrication of the power head are realized, the interior of equipment is kept clean and maintained in a proper temperature range, the thermal deformation is reduced, the sealing effect is ensured, the equipment is free from enclosure, and the service life of the equipment is greatly prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 1;

FIG. 5 is a schematic view of the connection of the translation assembly to the bearing housing of the present invention;

FIG. 6 is a partial cross-sectional view of the front cover of the present invention;

FIG. 7 is a schematic structural view of the shunt sleeve of the present invention;

FIG. 8 is a cross-sectional view of the shunt sheath of the present invention;

FIG. 9 is an enlarged view of section D of FIG. 8;

FIG. 10 is a cross-sectional view of the gland of the present invention;

in the figure: 1. the hydraulic drive device comprises a shell, 2, a main shaft, 3, a driving device, 3a, a hydraulic motor, 3b, a driving gear, 3c, a driven gear, 4, a liquid inlet, 5, a liquid outlet, 6, a first cooling cavity, 7, a bearing seat, 8, a bearing, 9, a second cooling cavity, 10, a first wear-resisting ring, 11, a diversion spray hole, 12, a slip, 13, a slip seat, 14, a second wear-resisting ring, 15, an oil cylinder, 16, a protrusion, 17, a recess, 18, a magnetic sucking piece, 19, a diversion sleeve, 20, a gland, 21, a speed reduction shell, 22, an annular groove, 23, a liquid discharge port, 24, a first diversion port, 25, a second diversion port, 26, a bearing shell, 27, a front cover and 28, and a rear cover.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1-10, the maintenance-free power head of the tunnel drilling machine with forced cooling and lubrication comprises a housing 1, a main shaft 2 rotating around the axis of the housing 1 and a driving device 3 driving the main shaft 2 to rotate are arranged on the housing, a hollow chuck device for clamping the main shaft 2 is sleeved outside the main shaft 2, the housing 1 and the main shaft 2 enclose to form a first cooling cavity 6 communicated with the inner cavity of the chuck device, a liquid inlet 4 is arranged on the chuck device, a liquid outlet 5 is arranged on the housing 1, and the liquid inlet 4 and the liquid outlet 5 are both communicated with the first cooling cavity 6.

When the underground drill rig is used, the driving device 3 is started to drive the main shaft 2 to rotate around the axial lead of the main shaft, and a drill rod is clamped by the chuck device; meanwhile, hydraulic oil is injected into the chuck device through the liquid injection port 4, and flows out of the liquid outlet 5 after passing through the inner cavity of the chuck device and the first cooling cavity in sequence. Hydraulic oil is at the flow in-process, take away the heat on chuck device and 2 surfaces of main shaft, and because the piece impurity that the friction produced, then flow out from liquid outlet 5, make 2 outside and chuck device inside maintenance of main shaft clean, avoid the wearing and tearing that the piece produced, utilize hydraulic oil to take away the heat simultaneously, cool down and lubricate main shaft 2 and chuck device, reduce main shaft 2 and chuck device's heat altered shape, thereby guarantee sealed effect, and the life of extension equipment, make equipment exempt from the maintenance. Of course, the liquid outlet 5 may also be arranged on the chuck means, correspondingly, the liquid inlet 4 is arranged on the housing 1.

As shown in fig. 1, the housing 1 includes a reduction housing 21, the driving device 3 includes a hydraulic motor 3a fixed to the reduction housing 21, a driving gear 3b coaxially fixed to an output end of the hydraulic motor 3a, and two driven gears 3c coaxially connected to the main shaft 2, the two driven gears 3c have different outer diameters, and the driving gear 3b is a duplicate gear engaged with one of the driven gears 3c.

When the driving device 3 is operated, the hydraulic motor 3a is started to drive the driving gear 3b to rotate, and the driving gear 3b acts on one driven gear 3c meshed with the driving gear 3b, so that the main shaft 2 is driven to rotate through the driven gear 3 c; because the driving gear 3b is a duplicate gear, the two driven gears 3c have different outer diameters, and the rotating speed of the main shaft 2 can be changed by controlling the meshing of the driving gear 3b and the other driven gear 3c, so that the driving gear 3b is selectively controlled to be meshed with one driven gear 3c according to different requirements, and the rotating speed of the main shaft 2 is adjusted.

As shown in fig. 2, the chuck device includes a slip bowl 13 sleeved outside the main shaft 2, at least three slips 12 disposed between the slip bowl 13 and the main shaft 2, and a translation assembly driving the slip bowl 13 to move axially along the main shaft 2, wherein the inner surface of the slip bowl 13 is in a shape of an expansion back to the hydraulic motor 3a, the slips 12 are uniformly distributed on a circumference using the center of the cross section of the main shaft 2 as a circle center, a bearing housing 26 is sleeved outside the slip bowl 13, and the slip bowl 13 and the bearing housing 26 enclose to form an inner cavity of the chuck device; a second wear-resistant ring 14 which is arranged outside the slip seat 13 in a sealing manner is arranged between the bearing shell 26 and the slip seat 13.

The main shaft 2 is in driving connection with a slip seat 13 in the chuck device, and the main shaft 2 is driven to rotate by the driving device 3 to drive the slip seat 13 and the slips 12 to rotate around the axial lead of the main shaft 2, so that a rotating function is realized; the slip seat 13 is driven to move along the axial direction of the main shaft 2 through the translation assembly, the slips 12 are driven to move close to the main shaft 2 along the radial direction of the main shaft 2 through the flaring-shaped inner wall of the slip seat 13, and finally the slips 12 abut against the main shaft 2 so as to clamp a drill rod; when hydraulic oil enters an inner cavity formed by enclosing the slip seat 13 and the bearing shell 26, impurities in the inner cavity and heat on the surface of the slip seat 13 are taken away, the surface of the inner cavity is kept clean, abrasion is reduced, the slip seat 13 is cooled, thermal deformation is prevented, the sealing effect is ensured, and the service life of the slip seat 13 is prolonged; can prevent the wearing and tearing between slip seat 13 and the bearing housing 26 through second wear ring 14, after wear ring 14 damages, only need align to change, and need not to change installation slip seat 13, reduced the replacement cost on the one hand, and on the other hand, it is more convenient to change, has alleviateed workman's work load to be favorable to improving work efficiency. The inner surface of the slip bowl 13 may be designed to be tapered toward the hydraulic motor 3a, and the above-described technical effects can be similarly achieved.

The slips 12 are fixedly connected to the slip bowl 13 by a magnetic attachment 18. Through magnetism the piece 18 realizes the fixed connection between slips 12 and the slip bowl 13 of inhaling to for traditional screw fixation mode that passes through, this slips 12's mounting means more is favorable to changing the installation to it fast, improves and changes efficiency, alleviates change work load.

As shown in fig. 5 and 6, the translation assembly includes an oil cylinder 15, a cylinder of the oil cylinder 15 is fixedly connected with the housing 1, one end of a piston rod of the oil cylinder 15 connected with the bearing housing 26 is provided with a spherical protrusion 16, one side of the slip seat 13 and the protrusion 16 is provided with a front cover 27 and a rear cover 28 which are fixedly connected through bolts, and the front cover 27 and the rear cover 28 enclose to form a recess 17 matched with the protrusion 16.

By adopting the design, the concave 17 formed by combining the front cover 27 and the rear cover 28 is matched with the spherical bulge 16 at the end part of the piston rod of the oil cylinder 15, so that the vibration transmitted to the oil cylinder 15 by the chuck device can be reduced when the equipment runs, and the service life of a sealing piece of the oil cylinder 15 is prolonged.

As shown in fig. 1, a bearing seat 7 sleeved outside the spindle 2 is further arranged between the housing 1 and the chuck device, a bearing 8 sleeved outside the spindle 2 is arranged on the bearing seat 7, and the bearing seat 7 and the spindle 2 enclose to form a second cooling cavity 9 communicated with an inner cavity of the chuck device and the first cooling cavity 6; as shown in fig. 3, 4 and 7-10, a shunt sleeve 19 sleeved outside the spindle 2 is disposed at one end of the housing 1 facing away from the chuck device, a gland 20 sleeved outside the spindle 2 is disposed at one end of the bearing seat 7 adjacent to the chuck device, and first wear-resistant rings hermetically disposed outside the spindle 2 are disposed between the shunt sleeve 19 and the spindle 2 and between the gland 20 and the spindle 2; the diversion sleeve 19 and the gland 20 are both provided with an annular groove 29 and a diversion spray hole 11 communicated with the inside of the annular groove; the annular groove 29 on the flow dividing sleeve 19 is communicated with the first cooling cavity 6, the liquid outlet of the flow guide spray hole 11 faces the sealing contact surface of the first wear-resisting ring 10 between the flow dividing sleeve 19 and the main shaft 2, the annular groove 29 on the gland 20 is communicated with the second cooling cavity 9, and the liquid outlet of the flow guide spray hole 11 faces the sealing contact surface of the first wear-resisting ring 10 between the bearing seat 7 and the main shaft 2. As shown in fig. 1 and 4, the bearing housing 26 is provided with a liquid inlet 4 and a liquid outlet 23 which are communicated with the inner cavity of the chuck device, the bearing seat 7 is provided with a first branch port 24 which is communicated with the second cooling cavity 9 and the liquid outlet 23, and the speed reduction housing 21 is provided with a second branch port 25 which is communicated with the liquid outlet 23 and the first cooling cavity 6 and a liquid outlet 5 which is communicated with the first cooling cavity 6.

The bearing 8 on the bearing seat 9 is used for supporting the support 2 to rotate stably, so that the vibration generated during the rotation is reduced; when flowing, the hydraulic oil firstly enters an inner cavity formed by the bearing shell 26 and the slip seat 13 through the liquid inlet 4, then is discharged through the liquid outlet 23, and is divided into two cooling flow passages, wherein one passage enters the second cooling cavity 9 through the first branch port 24, the other passage enters the first cooling cavity 6 through the second branch port 25, and finally the hydraulic oil in the two cooling flow passages is discharged through the liquid outlet 5. The hydraulic oil is at the flow in-process, has taken away the heat on 2 surfaces of main shaft and because the piece impurity that the friction produced, guarantees that the internal environment of equipment keeps at a higher clean level, takes away the heat that the friction produced through the flow of hydraulic oil simultaneously to stabilize the operation of equipment at a suitable temperature, prolonged the life of equipment, make equipment avoid maintaining.

The first wear-resistant ring 10 can prevent the main shaft 2 from being worn between the bearing seat 7 and the shell 1 in the rotating process, so that the main shaft 2 has a long enough service life, and the equipment is free from maintenance; when first wear-resisting ring 10 damaged, the worker also only need to change first wear-resisting ring 10 can, need not dismouting main shaft 2 and maintain, on the one hand for equipment maintenance is more convenient, has alleviateed work load, and on the other hand, owing to only need change first wear-resisting ring 10, therefore cost of maintenance reduces by a wide margin, thereby greatly reduced customer's use cost.

The diversion nozzles 11 on the diversion sleeve 19 and the gland 20 are all provided with a plurality of diversion nozzles, and the diversion nozzles are uniformly distributed on the circumference which takes the circle center of the cross section of the main shaft 2 as the center and face the first wear-resisting ring 10. After adopting above-mentioned structure for get into the hydraulic oil in the two way cooling runner in second cooling chamber 9 and the first cooling chamber 6, can evenly spray on the first wear-resisting ring 10 of two places through a plurality of water conservancy diversion orifice 11, and first wear-resisting ring is in the oil blanket friction and the department that generates heat of main shaft 2 just in time, therefore, can guarantee that hydraulic oil takes away heat and impurity at the very first time, and lubricate main shaft 2, the design that the multiple spot is even, be favorable to carrying out even heat absorption to first wear-resisting ring 10 and main shaft 9 periphery, avoid everywhere temperature nonconformity and cause the heat altered shape, so, improve the cooling effect through even heat absorption, the life of main shaft 2 and equipment has further been prolonged.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a forced cooling lubrication exempts from to maintain type gallery rig unit head, includes casing (1), be provided with on casing (1) around its self axial lead pivoted main shaft (2) and drive main shaft (2) rotatory drive arrangement (3), main shaft (2) overcoat is equipped with and is used for the tight cavity form chuck device of its clamp, its characterized in that:

casing (1) with main shaft (2) enclose close form with first cooling chamber (6) of chuck device inner chamber intercommunication, chuck device with one of casing (1) is provided with inlet (4), and another is provided with liquid outlet (5), inlet (4) with liquid outlet (5) all with first cooling chamber (6) intercommunication.

2. The forced cooling lubrication maintenance-free type underground drill power head according to claim 1, wherein: casing (1) with still be provided with the cover between the chuck device and locate bearing frame (7) outside main shaft (2), be provided with the cover on bearing frame (7) and locate bearing (8) outside main shaft (2), bearing frame (7) with main shaft (2) enclose close form with the chuck device inner chamber second cooling chamber (9) of first cooling chamber (6) intercommunication.

3. The forced cooling lubrication maintenance-free type underground drill power head according to claim 2, wherein: at least one of the shell (1) and the bearing seat (7) is provided with a first wear-resistant ring (10) sleeved outside the main shaft (2) between the main shaft (2) and the at least one of the shell and the bearing seat.

4. The forced cooling lubrication maintenance-free type underground drill power head according to claim 3, wherein: at least one of the shell (1) and the bearing seat (7) is provided with a flow guide spray hole (11) with an oil inlet communicated with the first cooling cavity (6) and an oil outlet facing the main shaft (2).

5. The forced cooling lubrication maintenance-free type underground drill power head according to claim 4, wherein: the bearing seat is characterized in that first wear-resistant rings (10) sleeved outside the main shaft (2) are arranged between the shell (1) and the main shaft (2) and between the bearing seat (7) and the main shaft (2), guide spray holes (11) are arranged on the shell (1) and the bearing seat (7), and oil outlets of the guide spray holes (11) face to sealing contact surfaces of the first wear-resistant rings (10).

6. The forced cooling lubrication maintenance-free type underground drill power head according to claim 4, wherein: the guide spray holes (11) are uniformly distributed on the circumference which takes the center of the cross section of the main shaft (2) as the center of a circle.

7. The forced cooling lubrication maintenance-free type underground drill power head according to claim 1, wherein: chuck device is located including the cover main shaft (2) outer slip bowl (13), set up in slip bowl (13) with at least three slips (12) and drive between main shaft (2) slip bowl (13) are followed main shaft (2) axial displacement's translation subassembly, the internal surface of slip bowl (13) is back to the flaring form or the orientation of drive arrangement (3) the closing-in form of drive arrangement (3), slips (12) distribute in with main shaft (2) cross section center is on the circumference of centre of a circle, slip bowl (13) external seal cover is equipped with bearing housing (26), slip bowl (13) with bearing housing (26) enclose to close and form chuck device's inner chamber.

8. The forced cooling lubrication maintenance-free type underground drill power head according to claim 7, wherein: and a second wear-resistant ring (14) which is hermetically sleeved outside the slip seat (13) is arranged between the bearing shell (26) and the slip seat (13).

9. The forced cooling lubrication maintenance-free type underground drill power head according to claim 7, wherein: the translation assembly comprises an oil cylinder (15), a cylinder barrel of the oil cylinder (15) is fixedly connected with the shell (1), a spherical bulge (16) is arranged at one end, connected with the bearing shell (26), of a piston rod of the oil cylinder (15), and a recess (17) matched with the bulge (16) is formed in one side, connected with the bearing shell (26), of the bearing shell (26).

10. The forced cooling lubrication maintenance-free type underground drill power head according to claim 7, wherein: the slips (12) are fixedly connected with the slip seat (13) through a magnetic suction piece (18).

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