Drilling device

Abstract

The utility model discloses a drilling device which comprises an equipment body, an oil blocking sealing piece and a cooling pipe set, the equipment body comprises an equipment body, a driving assembly, a driving rotating shaft and a machine shell, the machine shell is installed on the equipment body, and a first limiting part is formed; the driving assembly is arranged on the equipment body to drive the driving shaft penetrating through the machine shell to rotate, the oil blocking sealing piece is arranged on the machine shell in the mode of occupying the space, filled with the lubricant, in the machine shell and forms a second limiting part opposite to the first limiting part, and the cooling pipe set comprises a cooling liquid pipe. The cooling liquid pipe penetrates through the machine shell and the driving rotating shaft, and the part, located in the machine shell, of the cooling liquid pipe abuts against the second limiting part and the first limiting part so that the cooling liquid pipe can be prevented from moving relative to the machine shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field especially relates to with drilling device. BACKGROUND

[0002] Drilling device belongs to handheld electric tool, is used to drill hole on the surface of various objects equipment.

[0003] In the prior art drilling device, the cooling liquid pipe first penetrates the equipment main body and enters the internal space of the equipment main body, and penetrates the output shaft along the axial direction of the output shaft to form a water outlet at the output end of the output shaft. Among them, after the cooling liquid pipe enters the internal space of the equipment main body, it will be fixed to the inner wall of the internal space by the fastener. However, since the drilling device will vibrate during operation, the vibration will cause the fastener to detach from the inner wall of the internal space of the equipment main body, and the detached fastener will affect the rotation of the gear in the gear transmission assembly, and even block the rotating gear, thereby affecting the normal operation of the gear transmission assembly in the drilling device.

[0004] Further, since the internal space of the equipment main body is small, it is inconvenient for the worker to install the fastener on the inner wall of the internal space, thereby reducing the efficiency of installing the fastener on the inner wall of the internal space. After the fastener is detached from the inner wall of the internal space, the worker needs to disassemble the drilling device and find the detached fastener for maintenance, which is inconvenient. SUMMARY

[0005] To solve the above technical problems and achieve at least one advantage of the utility model, the utility model provides a drilling device, wherein the drilling device comprises:

[0006] The equipment main body comprises an equipment body, a driving assembly, a driving shaft and a casing, the casing is installed at the front end of the equipment body, the driving shaft penetrates the casing in a rotatable manner, and the inside of the driving shaft has a penetrating space extending along its own length direction, the casing forms a filling space for filling lubricant, and the driving assembly is arranged on the equipment body in a manner that the driving assembly can drive the driving shaft in the filling space.

[0007] The oil blocking seal is accommodated in the casing in a manner that the oil blocking seal occupies the filling space.

[0008] The cooling pipe group comprises a cooling liquid pipe, the cooling liquid pipe can be filled with cooling liquid, and the cooling liquid pipe penetrates the filling space and the penetrating space to make the cooling liquid flow out through the end of the driving shaft.

[0009] The inner wall of the shell has a first limiting portion facing the oil blocking seal, and the oil blocking seal has a second limiting portion oppositely arranged with the first limiting portion.

[0010] According to an embodiment of the present application, the cooling liquid pipe has a fixed portion, after the cooling liquid pipe is abutted by the second limiting portion and the first limiting portion, the cooling liquid pipe is bent towards the direction of the driving shaft and forms the fixed portion, a section of the cooling liquid pipe before the fixed portion is defined as a radial section, and a section of the cooling liquid pipe after the fixed portion is defined as an axial section.

[0011] According to an embodiment of the present application, the first limiting portion has a first inner shell limiting surface abutting against the radial section, and the second limiting portion has a first limiting surface abutting against the radial section and opposite to the first inner shell limiting surface, so that when the radial section abuts against the oppositely arranged first inner shell limiting surface and the first limiting surface, the cooling liquid pipe as a whole is limited to move relative to the shell along the axial direction of the driving shaft.

[0012] According to an embodiment of the present application, the first limiting portion has a second inner shell limiting surface abutting against the axial section, and the second limiting portion has a second limiting surface abutting against the axial section and opposite to the second inner shell limiting surface, so that when the axial section abuts against the oppositely arranged second inner shell limiting surface and the second limiting surface, the cooling liquid pipe as a whole is limited to move along the radial direction of the driving shaft.

[0013] According to an embodiment of the present application, the first limiting portion further has at least one pair of oppositely arranged third inner shell limiting surfaces, and one pair of the third inner shell limiting surfaces are oppositely arranged on both sides of the radial section in a manner of abutting against the radial section, and both of the third inner shell limiting surfaces are perpendicular to the first inner shell limiting surface and the second inner shell limiting surface, so that when the radial section abuts against the one pair of the third inner shell limiting surfaces, the cooling liquid pipe as a whole is limited to rotate with the part penetrating through the penetrating space as an axis.

[0014] According to an embodiment of the utility model, the first limiting part still has at least a pair of third shell inner limiting surfaces which are oppositely arranged, a pair of the third shell inner limiting surfaces are oppositely arranged on both sides of the axial section extension direction in a way that can abut on the axial section, and a pair of the third shell inner limiting surfaces are perpendicular to the first shell inner limiting surface and the second shell inner limiting surface, so as to limit the cooling liquid pipe as a whole to rotate around the part penetrating the insertion space when the radial section abuts on a pair of the third shell inner limiting surfaces.

[0015] According to an embodiment of the utility model, the second limiting part still has at least a pair of third limiting surfaces which are oppositely arranged, a pair of the third limiting surfaces are oppositely arranged on both sides of the fixed part extension direction in a way that can abut on the fixed part, and a pair of the third limiting surfaces are perpendicular to the first limiting surface and the second limiting surface, so as to limit the cooling liquid pipe as a whole to rotate around the part penetrating the insertion space when the fixed part abuts on a pair of the third limiting surfaces.

[0016] According to an embodiment of the utility model, the first limiting part extends towards the rear end to form the first shell inner limiting surface and a pair of the third shell inner limiting surfaces which are connected with each other, and forms a limiting groove between the first shell inner limiting surface and a pair of the third shell inner limiting surfaces.

[0017] According to an embodiment of the utility model, the second limiting part extends towards the front end to form the first limiting surface, the second limiting surface and a pair of the third limiting surfaces which are connected with each other, and forms a pipe blocking groove between the first limiting surface, the second limiting surface and a pair of the third limiting surfaces.

[0018] According to an embodiment of the utility model, the shell and the equipment body connection place have a compression ring step which is matched with the sealing part. ACCURATE DRAWINGS

[0019] Figure 1 A perspective view schematic diagram of one preferred embodiment of the utility model from one view angle is shown.

[0020] Figure 2 A perspective view schematic diagram of one preferred embodiment of the utility model from another view angle is shown.

[0021] Figure 3 A perspective view schematic diagram of one preferred embodiment of the utility model from another view angle is shown. Figure 2 A partial component cross section view schematic diagram of the utility model in 1-1 is shown.

[0022] Figure 4 A perspective view schematic diagram of one preferred embodiment of the utility model from another view angle is shown. Figure 3 An enlarged view schematic diagram of the utility model in A is shown.

[0023] Figure 5 A perspective view schematic diagram of one preferred embodiment of the utility model from another view angle is shown. Figure 3An enlarged view of the middle B.

[0024] Figure 6 An exploded view schematic diagram of the drive shaft, the casing, the oil blocking sealing member and the cooling pipe group in the preferred embodiment of the present application is shown.

[0025] Figure 7 A perspective view schematic diagram of the drive shaft, the casing, the oil blocking sealing member and the cooling pipe group in the preferred embodiment of the present application is shown.

[0026] Figure 8 A perspective view schematic diagram of the casing in the preferred embodiment of the present application is shown.

[0027] Figure 9 A perspective view schematic diagram of the oil blocking sealing member from one angle in the preferred embodiment of the present application is shown.

[0028] Figure 10 A perspective view schematic diagram of the oil blocking sealing member from another angle in the preferred embodiment of the present application is shown. 10, device main body; 11, device body; 12, driving assembly; 13, drive shaft; 1301, penetrating space; 1302, end liquid injection space; 131, expansion surface; 14, casing; 1401, filling space; 141, first limiting portion; 14101, limiting groove; 1411, first inner limiting surface; 1412, second inner limiting surface; 1413, third inner limiting surface; 142, pressing ring step; 20, oil blocking sealing member; 21, sealing portion; 211, second limiting portion; 21101, blocking pipe groove; 2111, first limiting surface; 2112, second limiting surface; 2113, third limiting surface; 22, oil blocking portion; 30, cooling pipe group; 31, cooling liquid pipe; 311, fixed portion; 3111, radial section; 3112, axial section; 32, sealing ring; 33, clamping member; 34, on-off member; DETAILED DESCRIPTION

[0029] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments in the following description are only examples of implementing the present application and other obvious modifications are possible to those skilled in the art. The basic principles defined in the following description of the present application can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0030] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0031] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0032] Reference Figures 1 to 10 The drilling device according to a preferred embodiment of the utility model will be described in detail below, wherein the drilling device comprises a device main body 10, an oil blocking seal 20 and a cooling pipe set 30.

[0033] Specifically, the device main body 10 comprises a device body 11, a driving assembly 12, a driving rotating shaft 13 and a machine shell 14. The machine shell 14 is installed at the front end of the device body 11. The driving rotating shaft 13 penetrates the machine shell 14 in a rotatable manner, and the driving rotating shaft 13 forms a penetrating space 1301. The driving assembly 12 is arranged on the device body 11 in a manner that can drive the driving rotating shaft 13 to rotate. The machine shell 14 forms a filling space 1401 for filling lubricant. The driving assembly 12 drives the driving rotating shaft 13 in the filling space 1401. When the driving assembly 12 drives the driving rotating shaft 13, the lubricating liquid in the filling space 1401 is attached to the output end of the driving assembly 12, so as to reduce the transmission resistance, reduce the heat generated by friction during transmission and prevent rust. The machine shell 14 has a first limiting portion 141.

[0034] The oil blocking seal 20 is arranged on the inner wall of the filling space 1401 of the machine shell 14 in a manner that can occupy the filling space 1401. The oil blocking seal 20 has a second limiting portion 211. The second limiting portion 211 is arranged opposite to the first limiting portion 141.

[0035] The cooling pipe set 30 comprises a cooling liquid pipe 31. The cooling liquid pipe 31 can be filled with cooling liquid. The cooling liquid pipe 31 penetrates the filling space 1401 and the insertion space 1301 from the end of the driving shaft 13 close to the driving assembly 12, so as to cool the driving shaft 13. The second limiting part 211 and the first limiting part 141 can limit the displacement of the cooling liquid pipe 31 relative to the casing 14 when they abut on both sides of the part of the cooling liquid pipe 31 located in the filling space 1401.

[0036] It is worth mentioning that, since the cooling liquid pipe 31 is limited in displacement by the first limiting part 141 and the second limiting part 211, the displacement of the cooling liquid pipe 31 relative to the casing 14 is avoided, so as to improve the stability of the cooling liquid pipe 31 after it penetrates the insertion space 1301. Meanwhile, since no extra component is needed to fix the cooling liquid pipe 31, the fixing of the cooling liquid pipe 31 is more convenient.

[0037] Preferably, the radial dimension of the insertion space 1301 is adapted to the radial dimension of the cooling liquid pipe 31.

[0038] As a preference, the equipment body 10 is implemented as a water drill.

[0039] It is worth mentioning that, the driving assembly 12 drives the driving shaft 13 to rotate through the transmission gears located in the filling space 1401, so the lubricant in the filling space 1401 can adhere to the surface of the transmission gears, so as to lubricate the transmission gears, reduce the friction and abrasion between the transmission gears, reduce the heat generated by the transmission gears during operation, and prevent the transmission gears from rusting.

[0040] Preferably, the cooling liquid pipe 31 has a fixed portion 311. The cooling liquid pipe 31 is abutted by the second limiting portion 211 and the first limiting portion 141, and is bent towards the driving shaft 13 and forms the fixed portion 311. A segment of the cooling liquid pipe 31 before the fixed portion 311 is defined as a radial segment 3111, and a segment of the cooling liquid pipe 31 after the fixed portion 311 is defined as an axial segment 3112. The oil blocking seal 20 comprises a sealing portion 21 and an oil blocking portion 22. The sealing portion 21 is arranged between the casing 14 and the equipment body 11, and closes the gap between the equipment body 11 and the casing 14 by the sealing portion 21, so as to avoid the outside dust from entering the gap and polluting the lubricant in the filling space 1401. The sealing portion 21 forms the second limiting portion 211 which can limit the movement of the cooling liquid pipe 31. The oil blocking portion 22 is connected to the sealing portion 21 in a manner that the oil blocking portion 22 extends to the filling space 1401 and occupies the volume of the filling space 1401. The oil blocking portion 22 can avoid the lubricant in the filling space 1401 from flowing to the equipment body 11.

[0041] It is worth mentioning that, since the lubricant in the filling space 1401 only plays a role when it is attached to the surface of the transmission gear, and the oil blocking portion 22 extends to the filling space 1401 and occupies the volume of the filling space 1401, so as to avoid the lubricant in the filling space 1401 which is not attached to the output end of the driving assembly 12 from being long-term deposited due to not being used, and thus the lubricant is not deteriorated. At the same time, since the space volume of the filling space 1401 is occupied by the oil blocking portion 22, the amount of the lubricant filled in the filling space 1401 can be reduced, and thus the cost is reduced.

[0042] Preferably, the first limiting portion 141 has a first inner limiting surface 1411 which can abut against the radial segment 3111. The second limiting portion 211 has a first limiting surface 2111 which can abut against the radial segment 3111 and is opposite to the first inner limiting surface 1411. In this way, when the radial segment 3111 abuts against the oppositely arranged first inner limiting surface 1411 and the first limiting surface 2111, the movement of the cooling liquid pipe 31 as a whole relative to the casing 14 in the axial direction of the driving shaft 13 is limited.

[0043] The first limiting part 141 has a second inner limiting surface 1412 of the shell abutting against the axial section 3112. The second limiting part 211 has a second limiting surface 2112 abutting against the axial section 3112 and opposite to the second inner limiting surface 1412 of the shell. When the axial section 3112 abuts against the oppositely arranged second inner limiting surface 1412 of the shell and the second limiting surface 2112, the overall cooling liquid pipe 31 is limited to move along the radial direction of the driving shaft 13.

[0044] In the embodiment, the first limiting part 141 further has at least one pair of third inner limiting surfaces 1413 of the shell oppositely arranged. One pair of the third inner limiting surfaces 1413 of the shell are oppositely arranged on both sides of the extending direction of the radial section 3111 and abutting against the radial section 3111, and both of the third inner limiting surfaces 1413 of the shell are perpendicular to the first inner limiting surface 1411 of the shell and the second inner limiting surface 1412 of the shell. When the radial section 3111 abuts against one pair of the third inner limiting surfaces 1413 of the shell, the overall cooling liquid pipe 31 is limited to rotate around the part penetrating the penetrating space 1301.

[0045] In another variant embodiment, the first limiting part 141 further has at least one pair of third inner limiting surfaces 1413 of the shell oppositely arranged. One pair of the third inner limiting surfaces 1413 of the shell are oppositely arranged on both sides of the extending direction of the axial section 3112 and abutting against the axial section 3112, and both of the third inner limiting surfaces 1413 of the shell are perpendicular to the first inner limiting surface 1411 of the shell and the second inner limiting surface 1412 of the shell. When the radial section 3111 abuts against one pair of the third inner limiting surfaces 1413 of the shell, the overall cooling liquid pipe 31 is limited to rotate around the part penetrating the penetrating space 1301.

[0046] In order for those skilled in the art to understand the present application, in at least one embodiment of the present application, only the first limiting part 141 further has at least one pair of third inner limiting surfaces 1413 of the shell oppositely arranged, one pair of the third inner limiting surfaces 1413 of the shell are oppositely arranged on both sides of the extending direction of the radial section 3111 and abutting against the radial section 3111, and both of the third inner limiting surfaces 1413 of the shell are perpendicular to the first inner limiting surface 1411 of the shell and the second inner limiting surface 1412 of the shell are taken as examples for description.

[0047] Preferably, the second limiting part 211 further has at least one pair of third limiting surfaces 2113 arranged oppositely. One pair of the third limiting surfaces 2113 are arranged oppositely on both sides of the extension direction of the fixed part 311 in a manner that can abut against the fixed part 311, and one pair of the third limiting surfaces 2113 are perpendicular to the first limiting surface 2111 and the second limiting surface 2112. In this way, when the fixed part 311 abuts against one pair of the third limiting surfaces 2113, the cooling liquid pipe 31 is limited to rotate as a whole with the part penetrating through the insertion space 1301 as the axis.

[0048] Preferably, the first limiting part 141 extends towards the rear end to form the first inner shell limiting surface 1411 and one pair of third inner shell limiting surfaces 1413 connected to each other, and a limiting groove 14101 is formed between the first inner shell limiting surface 1411 and one pair of third inner shell limiting surfaces 1413. When the radial section 3111 enters the limiting groove 14101, it abuts against the first inner shell limiting surface 1411 and one pair of third inner shell limiting surfaces 1413.

[0049] Further, the second limiting part 211 extends towards the front end to form the first limiting surface 2111, the second limiting surface 2112, and one pair of third limiting surfaces 2113 connected to each other, and a pipe blocking groove 21101 is formed between the first limiting surface 2111, the second limiting surface 2112, and one pair of third limiting surfaces 2113. When the fixed part 311 enters the pipe blocking groove 21101, it abuts against the first limiting surface 2111, the second limiting surface 2112, and one pair of third limiting surfaces 2113.

[0050] Preferably, the cooling liquid pipe 31 is implemented by a copper pipe.

[0051] As can be understood by those skilled in the art, during the process of the fixed part 311 of the cooling liquid pipe 31 entering the pipe blocking groove 21101 and continuing to extend to enter the insertion space 1301, the cooling liquid pipe 31 can be bent again at least once to adjust the posture when entering the insertion space 1301, so that the cooling liquid pipe 31 can smoothly extend and penetrate through the insertion space 1301.

[0052] Preferably, the connection between the shell 14 and the device body 11 has a pressing ring step 142 adapted to the sealing part 21, so that when the shell 14 is connected to the device body 11, the sealing part 21 is pressed against the surface of the pressing ring step 142, making the sealing part 21 more stable, and avoiding dust from entering the filling space 1401 from the gap between the device body 11 and the shell 14 due to the falling of the sealing part 21.

[0053] Preferably, the driving shaft 13 further forms an end liquid injection space 1302. The end liquid injection space 1302 is located at the end of the driving shaft 13 away from the filling space 1401 and communicates with the penetrating space 1301, and the radial dimension of the end liquid injection space 1302 is greater than that of the penetrating space 1301. The end of the cooling liquid pipe 31 can penetrate into the end liquid injection space 1302 away from the filling space 1401 and through the penetrating space 1301.

[0054] As can be understood by those skilled in the art, after the end of the cooling liquid pipe 31 penetrates through the penetrating space 1301, the end of the cooling liquid pipe 31 penetrates into the end liquid injection space 1302, and thus the liquid sprayed from the end of the cooling liquid pipe 31 enters the end liquid injection space 1302 and is sprayed away from the end liquid injection space 1302.

[0055] It is worth mentioning that, since the radial dimension of the end liquid injection space 1302 is greater than that of the cooling liquid pipe 31, when the outer wall of the end liquid injection space 1302 of the driving shaft 13 is deformed due to impact, the cooling liquid pipe 31 cannot enter the end liquid injection space 1302 and cannot spray liquid.

[0056] Preferably, the cooling pipe group 30 further comprises at least one sealing ring 32. The sealing ring 32 is arranged between the end outer wall of the cooling liquid pipe 31 penetrating into the end liquid injection space 1302 and the inner wall of the end liquid injection space 1302, so as to prevent the liquid sprayed from the end of the cooling liquid pipe 31 from entering the filling space 1401 through the gap between the inner wall of the end liquid injection space 1302 and the outer wall of the cooling liquid pipe 31, thereby causing the lubricating liquid to fail.

[0057] In this embodiment, specifically, the cooling pipe group 30 further comprises at least two clamping members 33, and the two clamping members 33 are arranged on the inner wall of the end liquid injection space 1302 and are attached to the two ends of the sealing ring 32 in the axial direction, so as to fix the sealing ring 32 at a predetermined position on the outer surface of the cooling liquid pipe 31 and prevent the sealing ring 32 from sliding along the surface of the cooling liquid pipe 31 and being detached.

[0058] It should be noted that, since the inner diameter of the end liquid injection space 1302 is greater than that of the penetrating space 1301, an expansion surface 131 is formed between the inner wall of the penetrating space 1301 and the inner wall of the end liquid injection space 1302.

[0059] In another variant, the cooling pipe set 30 further comprises at least one clamping member 33, one end of the sealing ring 32 abutting against the expansion surface 131, the clamping member 33 being arranged on the inner wall of the end liquid injection space 1302 and abutting against the other end of the sealing ring 32 away from the expansion surface 131 in the axial direction of the sealing ring 32. Thus, the sealing ring 32 is fixed at a predetermined position on the outer wall surface of the cooling liquid pipe 31, avoiding the sealing ring 32 from sliding along the surface of the cooling liquid pipe 31 and being detached.

[0060] Preferably, the clamping member 33 is implemented as a clamping spring.

[0061] The driving shaft 13 further forms a clamping groove matching the outer periphery of the clamping member 33, the clamping groove being arranged on the inner wall of the end liquid injection space 1302, the clamping groove corresponding to the position of the clamping member 33 and being insertable by the clamping member 33. In other words, the clamping member 33 can be fixed in the clamping groove, thereby stably fixing the sealing ring 32 at a predetermined position.

[0062] Preferably, the cooling pipe set 30 further comprises a switching member 34. The switching member 34 is arranged on the cooling liquid pipe 31 to control the switching of the flow of the cooling liquid in the channel formed by the cooling liquid pipe 31 through the switching member 34.

[0063] Preferably, the switching member 34 is implemented to include but not limited to a water valve.

[0064] It should be understood by those skilled in the art that the above description and the embodiments of the present application shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively realized. The functions and structural principles of the present application have been shown and described in the embodiments, and the embodiments of the present application can be any variant or modification without departing from the principles.

Claims

1. A drilling device, characterized in that: The drilling device comprises: The device body includes a device body, a drive assembly, a drive shaft, and a housing. The housing is mounted on the front end of the device body. The drive shaft rotatably penetrates the housing, and the interior of the drive shaft has an interpenetrating space extending along its own length. The housing forms a filling space for filling lubricant. The drive assembly is disposed on the device body in a manner that can drive the drive shaft to rotate in the filling space. an oil retaining seal, the oil retaining seal being accommodated in the housing in a manner of occupying the filling space; a cooling tube assembly, the cooling tube assembly including a coolant tube, the coolant tube being capable of being filled with coolant, the coolant tube penetrating the filling space and the interpenetrating space so as to allow the coolant to flow out through an end portion of the driving shaft; Among them, the inner wall of the casing has a first limiting portion facing the oil retaining seal, and the oil retaining seal has a second limiting portion arranged opposite to the first limiting portion. The first limiting portion and the second limiting portion respectively abut against both sides of the coolant pipe to limit the displacement of the coolant pipe relative to the casing.

2. The drilling device according to claim 1, characterized in that: The coolant pipe has a fixed portion. After the coolant pipe is abutted by the second limiting portion and the first limiting portion, the coolant pipe is bent in the direction of the driving shaft to form the fixed portion. A section of the coolant pipe before it is bent and forms the fixed portion is defined as a radial section, and a section of the coolant pipe after it is bent and forms the fixed portion is defined as an axial section. The oil-blocking seal includes a sealing portion and an oil-blocking portion. The sealing portion is arranged in the casing and is located between the casing and the equipment body. The sealing portion forms the second limiting portion that can limit the movement of the coolant pipe. The oil-blocking portion is connected to the sealing portion in a manner of extending toward the filling space and occupying the volume of the filling space. The oil-blocking portion can prevent the lubricant in the filling space from flowing to the equipment body.

3. The drilling device according to claim 2, characterized in that: The first limiting portion has a first inner-shell limiting surface facing the radial segment, and the second limiting portion has a first inner-shell limiting surface opposite to the first inner-shell limiting surface, so as to limit the movement of the coolant pipe relative to the casing along the axial direction of the drive shaft when the second limiting portion abuts against the first inner-shell limiting surface and the first limiting surface on both axial sides of the radial segment respectively.

4. The drilling device according to claim 3, characterized in that: The first limiting portion has a second inner-shell limiting surface facing the axial segment, and the second limiting portion has a second inner-shell limiting surface opposite to the second inner-shell limiting surface, so as to limit the radial movement of the coolant pipe relative to the casing along the driving shaft when the second inner-shell limiting surface and the second limiting surface are respectively abutted on the radial sides of the axial segment.

5. The drilling device according to claim 4, characterized in that: The first limiting portion also has at least one pair of third inner-shell limiting surfaces arranged opposite to each other, and the pair of third inner-shell limiting surfaces are respectively arranged opposite to each other on both sides of the extension direction of the radial segment in a manner that can abut against the radial segment, and the pair of third inner-shell limiting surfaces are both perpendicular to the first inner-shell limiting surface and the second inner-shell limiting surface, so as to limit the circumferential rotation of the coolant pipe relative to the casing when the radial segment abuts against the pair of third inner-shell limiting surfaces.

6. The drilling device according to claim 4, characterized in that: The first limiting portion also has at least one pair of third shell inner limiting surfaces arranged opposite to each other, and the pair of third shell inner limiting surfaces are respectively arranged opposite to each other on both sides of the extension direction of the axial segment in a manner that can abut against the axial segment, and the pair of third shell inner limiting surfaces are both perpendicular to the first shell inner limiting surface and the second shell inner limiting surface, so as to limit the circumferential rotation of the coolant pipe relative to the casing when the radial segment abuts against the pair of third shell inner limiting surfaces.

7. The drilling device according to claim 5, characterized in that: The second limiting portion further has at least a pair of third limiting surfaces arranged opposite to each other, and the pair of third limiting surfaces are respectively arranged on both sides of the extension direction of the fixing portion in a manner that can abut against the fixing portion, and the pair of third limiting surfaces are both perpendicular to the first limiting surface and the second limiting surface, so as to limit the circumferential rotation of the coolant pipe relative to the casing when the two sides of the fixing portion abut against the pair of third limiting surfaces.

8. The drilling device according to claim 7, characterized in that: The first limiting portion partially extends toward the rear end to form the first shell inner limiting surface and a pair of the third shell inner limiting surfaces connected to each other, and a limiting groove is formed between the first shell inner limiting surface and the pair of the third shell inner limiting surfaces.

9. The drilling device according to claim 8, characterized in that: The second limiting portion partially extends toward the front end to form the first limiting surface, the second limiting surface and a pair of the third limiting surfaces that are connected to each other, and a pipe-blocking groove is formed between the first limiting surface, the second limiting surface and the pair of the third limiting surfaces.

10. The drilling device according to any one of claims 3 to 9, characterized in that: The connection between the housing and the device body is provided with a pressure ring step adapted to the sealing portion.

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