Compact multi-stage mechanical seal drilling box

Abstract

The invention belongs to the technical field of coal mine underground digging and anchoring all-in-one machine transmission devices, and relates to a compact multi-stage mechanical sealing drill box which comprises a shell, a mud cover, a drill bushing, a main shaft, an inner hexagon screw, a water sealing assembly, a cylindrical roller bearing I, a stop pin I and a cylindrical roller bearing II. According to the compact multi-stage mechanical seal drilling box, a seal, a sealing ring and a shell are designed into an integrated module through a water seal assembly, and installation, disassembly and maintenance are convenient; the mechanical sealing design of the combination of the sealing static ring and the sealing moving ring is more suitable for cooling water with impurities, and has self-lubricating property and particle erosion resistance; the water sealing assembly is compact in design and smaller in axial space, original radial sealing of water sealing is changed into axial end face sealing through the design of the water sealing assembly, the surface of the main shaft is not abraded, and the service life of the main shaft is prolonged; the overflow hole is designed, when leakage occurs between seals, cooling water can be discharged through the overflow hole, and a warning effect can also be achieved when the cooling water is discharged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of driving devices of underground drilling and anchoring integrated machines, and particularly relates to a compact drill box with a compact structure and built-in multistage mechanical seals and suitable for high-pressure cooling water working conditions. BACKGROUND

[0002] The drill box is a core component of a drilling and anchoring machine drilling system, and is used to reliably transmit the output torque of a hydraulic motor to a drill rod and an anchor rod to complete roadway support work. In order to cool the drill bit and remove rock cuttings, cooling water needs to enter the drill rod through the main shaft passage.

[0003] In actual production, the drill box currently often adopts a water sealing mode in which a sealing ring embraces the main shaft. This radial sealing design cannot guarantee the stability of the water sealing for a long time. Water leakage often occurs: the leakage of cooling water into the bearing chamber will cause the emulsification of lubricating oil and the early failure of bearings; when the leakage further spreads, the cooling water may enter the hydraulic motor, pollute the entire hydraulic system and cause shutdown for maintenance; and once the sealing mode needs to be maintained and inspected, the disassembly is difficult and the engineering is complex.

[0004] Therefore, there is an urgent need in the prior art to solve the above problems. SUMMARY

[0005] The technical problem to be solved by the application is to provide an equipment for the problems in the background art.

[0006] A compact multistage mechanical seal drill box, characterized in that it comprises a shell, a mud guard, a drill sleeve, a main shaft, an internal hexagonal screw, a water sealing assembly, a cylindrical roller bearing I, a stop pin, a cylindrical roller bearing II and a round nut.

[0007] The main shaft is provided with a working hole;

[0008] One end of the shell is provided with a mud guard through an internal hexagonal screw; the outer wall of the shell is provided with a water inlet hole, a stop pin mounting hole and a sealing ring, the inside of the shell is provided with the main shaft, one end of the main shaft is connected with the drill sleeve, and the other end is provided with the round nut; and the main shaft is provided with the bearing I, the water sealing assembly and the bearing II matched with the inner cavity of the shell;

[0009] The water sealing assembly comprises an elastic pin I, a two-stage sealing seat, a sealing shell, a sealing static ring, a sealing dynamic ring driving frame, an elastic pin II, a sealing dynamic ring and a spring.

[0010] The number of the two-stage sealing seats is two, and the two-stage sealing seat is an annular provided with a boss; the boss is regularly provided with an elastic pin mounting hole I; the two-stage sealing seat is sleeved on the main shaft; the inner wall of the two-stage sealing seat is provided with an annular groove on the contact surface with the main shaft; and the annular groove is provided with a sealing ring.

[0011] The number and position of the elastic pin mounting hole I and the elastic pin mounting hole II are matched with each other;

[0012] The sealing shell is cylindrical, and two ends of the sealing shell are connected with two secondary sealing seats respectively. The shape of the end edge of the sealing shell is matched with the shape of the boss, and the elastic pin mounting hole II matched with the elastic pin mounting hole I is arranged on the sealing shell. The elastic pin II sequentially passes through the elastic pin mounting hole I and the elastic pin mounting hole II, so that the secondary sealing seat is connected with the sealing shell.

[0013] The working through hole I is regularly arranged on the sealing shell, and the stop pin sequentially passes through the stop pin mounting hole and the working through hole I.

[0014] The sealing static ring is arranged in the sealing shell, and the number of the sealing static ring is two, which are arranged at two ends of the inner wall of the sealing shell.

[0015] The working through hole II is regularly arranged on the sealing dynamic ring driving frame, and the elastic pin I sequentially passes through the working through hole II and the working hole on the main shaft.

[0016] The sealing dynamic ring is arranged on the two sides of the sealing dynamic ring driving frame in a clamping mode, and the number of the sealing dynamic ring is two. The spring limiting through hole is arranged on the sealing dynamic ring driving frame, and the spring is arranged in the spring limiting through hole. The two ends of the spring are in contact with the two sealing dynamic rings respectively.

[0017] The round nut stop washer is arranged between the round nut and the main shaft.

[0018] The recess is arranged on the contact surface of the inner wall of the shell, the secondary sealing seat and the sealing shell, and the sealing ring is arranged in the recess.

[0019] The number of the stop pin I is one, and the number of the working hole, the elastic pin I, the elastic pin II and the spring is more than one.

[0020] The sealing static ring is a graphite material sealing ring, and the sealing dynamic ring is a hard alloy material dynamic ring.

[0021] The annular recess is arranged on the sealing shell, and the working through hole I is regularly arranged in the annular recess.

[0022] The elastic pin I sequentially passes through the working through hole II and the working hole on the main shaft, so that the sealing dynamic ring driving frame moves synchronously with the main shaft.

[0023] The protruding piece is regularly arranged on the sealing dynamic ring driving frame, the mounting groove matched with the protruding piece is arranged on the sealing dynamic ring, and the protruding piece and the mounting groove are clamped, so that the sealing dynamic ring driving frame drives the sealing dynamic ring to move when rotating.

[0024] The sealing dynamic ring is provided with an annular groove on the surface in contact with the main shaft, and a sealing ring is arranged in the groove.

[0025] The sealing dynamic ring is connected with the sealing static ring in close contact under the action of the spring.

[0026] Through the above design scheme, the application provides a compact multi-stage mechanical sealing drill box, the water sealing assembly is designed as an integrated module with the sealing ring and the shell, so that the installation, disassembly and maintenance are facilitated; the mechanical sealing designed by combining the sealing static ring and the sealing dynamic ring can better adapt to the cooling water containing impurities, has self-lubricating property and anti-particle erosion; the water sealing assembly of the application is designed to be compact, the axial space is smaller, and the original radial sealing of the water sealing is changed into axial end face sealing through the design of the water sealing assembly, so that the surface of the main shaft is not abraded, and the service life of the main shaft is prolonged; the application is designed with an overflow hole, when leakage occurs between the seals, the cooling water can be discharged through the overflow hole, and the discharge can also play a warning role. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a sectional view of the application.

[0028] Figure 2 It is Figure 1 a sectional view after rotating 90 degrees;

[0029] Figure 3 It is Figure 1 a local enlarged view of the I area;

[0030] Figure 4 It is Figure 1 a local enlarged view of the II area;

[0031] Figure 5 It is Figure 2 a local enlarged view of the III area;

[0032] Figure 6 It is a structure schematic view of the secondary sealing seat of the application;

[0033] Figure 7 It is a structure schematic view of the sealing shell of the application;

[0034] Figure 8 It is a structure schematic view of the sealing dynamic ring driving frame of the application;

[0035] Figure 9 It is an assembly schematic view of the sealing dynamic ring driving frame and the sealing dynamic ring;

[0036] Figure 10 It is an assembly explosion view of the sealing dynamic ring driving frame and the sealing dynamic ring;

[0037] Figure 11A sectional view of the water seal assembly of the present application;

[0038] In the figure: 1-drill sleeve, 2-mudguard, 3-main shaft, 4-internal hexagonal screw, 6-cylindrical roller bearing I, 7-housing, 71-water inlet hole, 72-overflow hole, 8-cylindrical roller bearing II, 10-circular nut, 11-stop pin I, 12-elastic pin I, 14-secondary seal seat, 141-elastic pin mounting hole I, 15-seal housing, 151-elastic pin mounting hole II, 152-working through hole I, 17-seal static ring, 18-seal dynamic ring driving frame, 181-working through hole II, 182-protruding piece, 20-seal dynamic ring, 201-mounting groove, 22-elastic pin II, 23-spring. DETAILED DESCRIPTION

[0039] The present application is further illustrated in conjunction with the accompanying drawings:

[0040] A compact multi-stage mechanical seal drill box, characterized in that it comprises a housing 7, a mudguard 2, a drill sleeve 1, a main shaft 3, an internal hexagonal screw 4, a water seal assembly, a cylindrical roller bearing I 6, a stop pin I 11, a cylindrical roller bearing II 8 and a circular nut 10;

[0041] The main shaft 3 is provided with a working hole;

[0042] One end of the housing 7 is provided with a mudguard 2 through an internal hexagonal screw 4; and the outer wall of the housing 7 is provided with a water inlet hole 71, a stop pin mounting hole and an overflow hole 72, the housing 7 is internally provided with a main shaft 3, one end of the main shaft 3 is connected with the drill sleeve 1, and the other end is provided with a circular nut 10; and the main shaft 3 is provided with a bearing I 6, a water seal assembly and a bearing II 8 matched with the inner cavity of the housing 7;

[0043] The water seal assembly comprises an elastic pin I 12, a secondary seal seat 14, a seal housing 15, a seal static ring 17, a seal dynamic ring driving frame 18, an elastic pin II 22, a seal dynamic ring 20 and a spring 23;

[0044] The number of the secondary seal seat 14 is two, and the secondary seal seat 14 is an annular provided with a boss, the boss is regularly provided with an elastic pin mounting hole I 141; the secondary seal seat 14 is sleeved on the main shaft 3, and the inner wall of the secondary seal seat 14 is provided with an annular groove on the contact surface with the main shaft 3, and a sealing ring is arranged in the annular groove;

[0045] The sealing shell 15 is cylindrical, and two ends of the sealing shell 15 are connected with two secondary sealing seats 14 respectively, the shape of the end edge of the sealing shell 15 is matched with the shape of the boss, and elastic pin mounting holes II 151 matched with the elastic pin mounting holes I 141 are arranged on the end edge; the elastic pin II 22 sequentially passes through the elastic pin mounting holes I 141 and the elastic pin mounting holes II 151, so that the secondary sealing seat 14 is connected with the sealing shell 15;

[0046] The number and position of the elastic pin mounting holes I 141 and the elastic pin mounting holes II 151 are matched with each other;

[0047] Regular working through holes I 152 are arranged on the sealing shell 15, and the stop pin 11 sequentially passes through the stop pin mounting hole and the working through hole I 152;

[0048] Sealing static rings 17 are arranged in the sealing shell 15, and the number of the sealing static rings 17 is two, which are arranged at two ends of the inner wall of the sealing shell 15;

[0049] Regular working through holes II 181 are arranged on the sealing dynamic ring driving frame 18, and the elastic pin I 12 sequentially passes through the working through hole II 181 and the working hole on the main shaft 3;

[0050] Sealing dynamic rings 20 are clamped on both sides of the sealing dynamic ring driving frame 18, and the number of the sealing dynamic rings 20 is two; a spring limiting through hole is arranged on the sealing dynamic ring driving frame 18, and a spring 23 is arranged in the spring limiting through hole, and two ends of the spring 23 are in contact with the two sealing dynamic rings 20 respectively.

[0051] A round nut stop washer 9 is arranged between the round nut 10 and the main shaft 3.

[0052] Grooves are arranged on the contact surface of the inner wall of the shell 7, the secondary sealing seat 14 and the sealing shell 15, and sealing rings are arranged in the grooves.

[0053] The number of the stop pin I 11 is one, and the number of the working hole, the elastic pin I 12, the elastic pin II 22 and the spring 23 is more than one.

[0054] The sealing static ring 17 is a graphite material sealing ring, and the sealing dynamic ring 20 is a hard alloy material dynamic ring.

[0055] An annular groove is arranged on the sealing shell 15, and the working through hole I 152 is regularly arranged in the annular groove.

[0056] The elastic pin I 12 sequentially passes through the working through hole II 181 and the working hole on the main shaft 3, so that the sealing dynamic ring driving frame 18 moves synchronously with the main shaft 3.

[0057] The sealing dynamic ring driving frame 18 is regularly provided with a protruding piece 182, and the sealing dynamic ring 20 is provided with a mounting groove 201 matched with the protruding piece 182, the protruding piece 182 is clamped with the mounting groove 201, so that the sealing dynamic ring driving frame 18 drives the sealing dynamic ring 20 to move when rotating.

[0058] The sealing dynamic ring 20 is provided with an annular groove on the surface in contact with the main shaft 3, and the groove is provided with a sealing ring.

[0059] The sealing dynamic ring 20 is tightly connected with the sealing static ring 17 under the action of the spring 23.

[0060] The sealing shell 15 is connected with the shell 7 through the stop pin 11, and the sealing shell 15 is connected with the secondary sealing seat 14 through the elastic pin II 22, so that the shell 7, the secondary sealing seat 14 and the sealing shell 15 become an integrated body, the secondary sealing seat 14 and the sealing shell 15 are fixedly connected with the shell 7 to form an integrated module design, which is convenient for disassembly and installation.

[0061] The two sealing dynamic rings 20 share the pre-pressure provided by the springs 23, so that the sealing dynamic ring 20 is tightly connected with the sealing static ring 17, the axial size can be shortened, and the pre-pressure of the mechanical seal on both sides is consistent.

[0062] The sealing ring can be any one of an O-shaped sealing ring, a generic sealing ring or a Gley ring.

[0063] The sealing dynamic ring 20 and the sealing static ring 17 form a mechanical seal, and the sealing ring is arranged outside the mechanical seal as a secondary seal, which continues to isolate the cooling water when the mechanical seal fails.

[0064] The sealing dynamic ring driving frame 18 moves synchronously with the main shaft 3 under the action of the elastic pin I 12, and the sealing dynamic ring driving frame 18 is provided with the sealing dynamic ring 20 on both sides through the protruding piece 182.

[0065] The shell 7 is provided with an overflow hole 72 on the outer wall: when the sealing of the sealing dynamic ring 20 and the sealing static ring 17 and the sealing ring leaks, the cooling water will flow out through the overflow hole 72 and will not enter the bearing cavity.

[0066] The water sealing assembly is easy to install and disassemble, and can be quickly replaced and detected and maintained when a fault occurs.

[0067] The sealing life is prolonged: the main seal of the sealing dynamic ring 20 and the sealing static ring 17 adopts a mechanical seal, the sealing dynamic ring 20 adopts a hard alloy, and the sealing static ring 17 adopts graphite, which can adapt to the cooling water with impurities, has self-lubricating property and is resistant to particle erosion.

[0068] The design of the present application changes the water seal from radial seal to axial seal, the end face of the movable ring 20 and the static ring 17 is sealed, the surface of the main shaft 3 is not ground, and the service life of the main shaft 3 is prolonged.

[0069] The number and position of the elastic pin mounting hole I 141 and the elastic pin mounting hole II 151 correspond to each other, the number of the elastic pin II 22 is less than the number of the elastic pin mounting hole I 141, the elastic pin mounting hole I 141 without the elastic pin II 22 inserted and the elastic pin mounting hole II 151 also form a drainage channel, and cooperate with the overflow hole 72;

[0070] The design of the overflow hole 72: the cooling water enters the main shaft 3 through the water inlet hole 71, the working through hole I 152 and the working through hole II 181; the shell 7 is in close contact with the sealing shell 15, and the inner wall of the shell 7 is provided with a sealing ring, if the cooling water seeps out, it can flow out through the overflow hole 72 of the shell 7; the position of the elastic pin mounting hole I 141 and the elastic pin mounting hole II 151 cooperates with each other, also forms a channel for the seeped cooling water to flow out, also flows out through the overflow hole 72, prevents the cooling water from flowing into the bearing chamber, causes the lubricating oil to be emulsified, and the bearing to be early failure.

Claims

1. A compact multi-stage mechanical seal drill box, characterized in that, Includes housing (7), mudguard (2), drill bushing (1), spindle (3), socket head cap screw (4), water seal assembly, cylindrical roller bearing I (6), stop pin (11), cylindrical roller bearing II (8) and round nut (10); The main shaft (3) is provided with a working hole; The housing (7) has a mudguard (2) installed at one end by an internal hexagon screw (4); and the outer wall of the housing (7) is provided with a water inlet (71), a stop pin mounting hole and an overflow hole (72); the housing (7) is provided with a spindle (3) inside; one end of the spindle (3) is connected to the drill sleeve (1) and the other end is provided with a round nut (10); and the spindle (3) is provided with a bearing I (6), a water seal assembly and a bearing II (8) that cooperate with the inner cavity of the housing (7); The water seal assembly includes an elastic pin I (12), a secondary seal seat (14), a seal housing (15), a stationary seal ring (17), a rotating seal ring drive frame (18), an elastic pin II (22), a rotating seal ring (20), and a spring (23); There are two secondary sealing seats (14). Each secondary sealing seat (14) is an annular ring with a boss on it. Elastic pin mounting holes I (141) are regularly arranged on the boss. The secondary sealing seat (14) is sleeved on the main shaft (3). An annular groove is provided on the inner wall of the secondary sealing seat (14) in contact with the main shaft (3). A sealing ring is provided in the annular groove. The sealing housing (15) is cylindrical, and its two ends are respectively connected to two secondary sealing seats (14). The shape of the end edge of the sealing housing (15) matches the shape of the boss, and it is provided with an elastic pin mounting hole II (151) that matches the elastic pin mounting hole I (141). The elastic pin II (22) passes through the elastic pin mounting hole I (141) and the elastic pin mounting hole II (151) in sequence, so that the secondary sealing seat (14) is connected to the sealing housing (15). The number and position of the elastic pin mounting holes I (141) and II (151) are mutually matched; The sealing housing (15) is provided with working through holes I (152) in a regular manner, and the stop pin (11) passes through the stop pin mounting hole and the working through hole I (152) in sequence; The sealing housing (15) is provided with two sealing rings (17), which are respectively provided at both ends of the inner wall of the sealing housing (15). The sealing ring drive frame (18) is regularly provided with working through holes II (181), and the elastic pin I (12) passes through the working through holes II (181) and the working holes on the main shaft (3) in sequence; The sealing ring drive frame (18) is provided with two sealing rings (20) on both sides; the sealing ring drive frame (18) is provided with a spring limiting through hole, and a spring (23) is provided in the spring limiting through hole, and the two ends of the spring (23) are respectively in contact with the two sealing rings (20).

2. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: A round nut stop washer (9) is provided between the round nut (10) and the main shaft (3).

3. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The inner wall of the housing (7) is provided with a groove on the contact surface with the secondary sealing seat (14) and the sealing housing (15), and a sealing ring is provided in the groove.

4. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The number of stop pin I (11) is one, and the number of working hole, elastic pin I (12), elastic pin II (22) and spring (23) is one or more.

5. The integrated tunneling and anchoring machine drill box with a multi-stage sealing structure according to claim 1, characterized in that: The stationary sealing ring (17) is a graphite sealing ring; the moving sealing ring (20) is a cemented carbide moving ring.

6. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The sealing housing (15) is provided with an annular groove, and the working through hole I (152) is regularly arranged in the annular groove.

7. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The elastic pin I (12) passes through the working through hole II (181) and the working hole on the main shaft (3) in sequence, so that the sealing ring drive frame (18) moves synchronously with the main shaft (3).

8. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The sealing ring drive frame (18) has regularly arranged protruding pieces (182), and the sealing ring (20) has an installation groove (201) that mates with the protruding pieces (182). The protruding pieces (182) are engaged with the installation groove (201), so that the sealing ring drive frame (18) drives the sealing ring (20) to move when it rotates.

9. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: An annular groove is provided on the surface of the sealing ring (20) that contacts the main shaft (3), and a sealing ring is provided in the groove.

10. The tunneling and anchoring integrated drilling box with a multi-stage sealing structure according to claim 1, characterized in that: The sealing moving ring (20) is in close contact with the sealing stationary ring (17) under the action of the spring (23).

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