An intrinsically safe drill tank dustproof sealing structure

Abstract

The utility model relates to an intrinsically safe drill box dustproof sealing structure belongs to drill box dustproof sealing technical field, concretely relates to an intrinsically safe drill box dustproof sealing structure. Aims at solving the problems existing in the process of the current coal mine underground anchor rod, in the process, oil seal lip long-term immersion in the mud water, and the friction with the main shaft, causes the main shaft end face to be ground out groove. Further lead to oil seal spring pre-tightening force deficiency, lip cannot hold tightly the main shaft end face. Moreover, when maintaining, need to replace oil seal to disassemble complete machine, the worn main shaft surface will make sealing failure, when maintaining, also need to replace the main shaft. To solve the above problem, now provide an intrinsically safe drill box dustproof sealing structure. The structure is through the design combination of oil seal external installation, friction surface downward, T type stationary cover, can effectively prevent the mud water invasion. Its maintenance is convenient, and oil seal and T type stationary cover are independent structure, and easy to replace. The main shaft is not directly contacted with oil seal, can prolong the service life of main shaft.

Description

Technical Field

[0001] This utility model belongs to the field of drill box dustproof sealing technology, specifically relating to an intrinsically safe drill box dustproof sealing structure. Background Technology

[0002] When drilling anchor bolts underground in coal mines, the drill jack spindle needs to drive the drill rod to rotate, while water is discharged from the center of the drill bit for cooling and slag removal. Especially when drilling vertically upwards, the mud and water will flow down the drill rod, easily intruding into the friction surface of the oil seal lip at the drill jack spindle. This can lead to problems such as seal failure, water entering the bearing cavity, and lubricant emulsification. In severe cases, it can cause spindle wear and even render the spindle unusable.

[0003] Although existing structures typically incorporate labyrinth seals or other auxiliary methods, the seal lip remains at risk of erosion due to the splashing and accumulation of mud and water. This leads to the following existing problems: When the oil seal lip is constantly immersed in mud and water, dust and mud particles can easily become trapped at the lip edge and rub against the spindle. Over time, grooves will be worn into the spindle end face, the oil seal spring preload will be insufficient, the lip will not be able to tightly grip the spindle end face, and external water can directly enter the bearing cavity, causing lubricant emulsification.

[0004] Maintenance requires disassembling the entire machine and replacing the oil seal. If the spindle surface is worn, the sealing function will fail, and the spindle will also need to be replaced during maintenance. Therefore, there is an urgent need for an intrinsically safe dustproof sealing structure that is reliable in structure, easy to maintain, and can provide effective protection under conditions of severe mud and water interference. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an intrinsically safe dustproof sealing structure for drill boxes, which aims to achieve efficient protection of the spindle dustproof sealing parts by using a reverse oil seal structure, setting a wear-resistant stationary ring, and making reasonable use of the principles of gravity and centrifugal force, thereby solving the problem of easy failure of the sealing surface in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an intrinsically safe dustproof sealing structure for a drill box, comprising a drill sleeve, a T-shaped stationary sleeve, and an external oil seal; The external oil seal includes a metal skeleton, an annular elastic sealing base, an annular ridge, an annular spring, and a lip. A drill sleeve is provided inside the drill box. The inner wall of one end of the drill sleeve is adapted to the outer side of the drill rod, and the other end is sleeved on the main shaft of the drill box. A T-shaped stationary sleeve is provided on the outer periphery of the drill sleeve near the main shaft. An external oil seal is provided on the outside of the drill sleeve and the T-shaped stationary sleeve. The external oil seal is in the shape of a coaxial ring, and its axial cross section is a wide umbrella-shaped structure with a narrow top and a wide bottom. Its axial cross section forms a first step and a second step with decreasing diameter from bottom to top. The first step and the second step are integrally formed to form the annular elastic sealing base. At least two annular protrusions are provided on the inner side of the first step, which are distributed along the circumferential direction, and there is a gap between the annular protrusions. An annular spring groove is provided on the outer side of the first step at the corresponding position of the annular protrusions, and an annular spring is embedded in the groove. The lip is integrally connected to the bottom of the inner circumferential surface of the first stepped section and is in the shape of a slope. The outer circumferential surface of the second step section is provided with an annular groove, and an L-shaped metal skeleton is embedded in the annular groove; An annular transition ramp is provided at the junction of the first and second stepped sections.

[0007] Furthermore, it also includes a shaft head seal O-ring, which is disposed between the main shaft and the drill bushing, and is tightly fitted to the outer periphery of the main shaft and the inner wall of the drill bushing, respectively.

[0008] Furthermore, it also includes a drill pipe sealing ring, which is fitted between the outer side of the drill pipe and the drill sleeve, and is tightly fitted to the outer side of the drill pipe and the inner side of the drill sleeve, respectively.

[0009] Furthermore, it also includes a mudguard and hexagonal head screws. The mudguard is located on the outside of the drill box body and has through holes. The T-shaped stationary sleeve is disposed on the outside of the main shaft, and its axial inner side is tightly fitted with the housing of the main shaft. A through hole is provided on its radial side, which is adapted to the through hole of the mudguard. The hexagonal head screws pass through the through holes of the mudguard and the T-shaped stationary sleeve, fixing the two components sequentially onto the drill box body.

[0010] Furthermore, the annular protrusion of the first step of the external oil seal fits against the outer side of the T-shaped stationary sleeve; its second step is fixed to the outer periphery of the drill sleeve by a metal skeleton.

[0011] Furthermore, the outer side of the T-shaped stationary sleeve is provided with a lubricating surface.

[0012] Furthermore, it also includes an O-ring, which is disposed between the T-shaped stationary sleeve and the surface of the drill box body.

[0013] Furthermore, it also includes a skeleton oil seal, which is disposed radially inside the T-shaped stationary sleeve and positioned between the drill box housing and the spindle.

[0014] Through the above design scheme, this utility model can bring the following beneficial effects: the combination of external oil seal installation, downward friction surface, and T-shaped stationary sleeve effectively prevents mud and water from entering; maintenance is convenient, as the external oil seal and T-shaped stationary sleeve are independent structures and easy to replace; the main shaft does not directly rub against the oil seal, extending the service life of the main shaft; the combined action of centrifugal force and gravity forms natural protection, possessing inherent safety characteristics, and is suitable for long-term reliable operation in complex, high-dust, and high-mud environments in coal mines. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the external oil seal of this utility model; Among them: 1 is the drill bushing, 2 is the T-type stationary sleeve, 3 is the external oil seal, 31 is the metal skeleton, 32 is the annular elastic sealing base, 321 is the first step section, 322 is the second step section, 33 is the annular convex rib, 34 is the annular spring, 35 is the lip, 4 is the main spindle, 5 is the shaft head seal O-ring, 6 is the drill pipe seal ring sleeve, 7 is the mudguard, 8 is the internal hexagonal head screw, 9 is the O-ring, and 10 is the skeleton oil seal. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of protection of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0017] like Figure 1 and Figure 2 As shown, this embodiment adopts the following technical solution: an intrinsically safe drill box dustproof sealing structure, including a drill sleeve 1, a T-shaped stationary sleeve 2 and an external oil seal 3; The external oil seal 3 includes a metal skeleton 31, an annular elastic sealing base 32, an annular ridge 33, an annular spring 34, and a lip 35; A drill sleeve 1 is provided inside the drill box. The inner wall of one end of the drill sleeve 1 is adapted to the outer side of the drill rod, and the other end is sleeved on the main shaft 4 of the drill box. A T-shaped stationary sleeve 2 is provided on the outer periphery of the drill sleeve near the main shaft 4. The external oil seal 3 is sleeved on the outside of the drill sleeve 1 and the T-shaped stationary sleeve 2. The external oil seal 3 is in the shape of a coaxial ring, and its axial cross section is an umbrella-shaped structure that is narrow at the top and wide at the bottom. Its axial cross section forms a first step segment 321 and a second step segment 322 with decreasing diameter from bottom to top. The first step segment 321 and the second step segment 322 are integrally formed and connected to form the annular elastic sealing base 32. At least two annular protrusions 33 distributed along the circumferential direction are provided on the inner side of the first step segment 321, and there is a gap between the annular protrusions 33. An annular spring groove is opened on the outer side of the first step segment 321 at the corresponding position of the annular protrusions 33, and an annular spring 34 is embedded in the groove. The lip 35 is integrally connected to the bottom of the inner circumferential surface of the first stepped segment 321 and is in the shape of a slope. The outer circumferential surface of the second step 322 is provided with an annular groove, and an L-shaped metal skeleton 31 is embedded in the annular groove; An annular transition ramp is provided at the junction of the first step segment 321 and the second step segment 322.

[0018] Furthermore, it also includes a shaft head sealing O-ring 5, which is disposed between the main shaft 4 and the drill sleeve 1, and is tightly fitted to the outer periphery of the main shaft 4 and the inner wall of the drill sleeve 1, respectively.

[0019] Furthermore, it also includes a drill pipe sealing ring 6, which is sleeved between the outer side of the drill pipe and the drill sleeve 1, and is tightly fitted to the outer side of the drill pipe and the inner side of the drill sleeve 1 respectively.

[0020] Furthermore, it also includes a mudguard 7 and an internal hexagonal head screw 8. The mudguard 7 is located on the outside of the drill box body and has a through hole. The T-shaped stationary sleeve 2 is disposed on the outside of the main shaft 4, and its axial inner side is tightly fitted with the housing of the main shaft 4. A through hole is provided on its radial side, which is adapted to the through hole of the mudguard 7. The hexagonal head screw 8 passes through the through holes of the mudguard 7 and the T-shaped stationary sleeve 2, fixing the two components to the drill box body in sequence.

[0021] Furthermore, the annular protrusion 33 of the first step section 321 of the external oil seal 3 fits against the outer side of the T-shaped stationary sleeve 2; its second step section 322 is fixed to the outer periphery of the drill sleeve 1 by a metal frame 31.

[0022] Furthermore, the outer side of the T-shaped stationary sleeve 2 is provided with a lubricating surface.

[0023] Furthermore, it also includes an O-ring 9, which is disposed between the T-shaped stationary sleeve 2 and the surface of the drill box body.

[0024] Furthermore, it also includes a skeleton oil seal 10, which is disposed radially inside the T-shaped stationary sleeve 2 and positioned between the drill box housing and the spindle 4.

[0025] In this invention, the external oil seal 3 has its lip 35 facing the drill box body during use. When the drill box is working, the external oil seal 3 rotates at high speed with the drill rod due to the fixing force between the second step 322 and the drill sleeve 1. Simultaneously, the first step 321 forms a friction pair with the T-shaped stationary sleeve 2, resulting in an umbrella-shaped structure for the entire external oil seal 3. This design facilitates the free flow of wastewater and generates strong centrifugal force during high-speed rotation, which throws the wastewater away, preventing excessive accumulation and seepage at the lip. Furthermore, the structure of the external oil seal 3, together with the T-shaped stationary sleeve 2, creates a labyrinthine water-blocking zone, extending the water flow path. The lip position better adapts to vibrations during use, thus maintaining sealing performance. In addition, the T-shaped stationary sleeve 2 is coated with a ceramic lubricating surface, providing superior wear resistance and effectively extending the service life of the entire sealing device.

[0026] The advantages of this utility model can be summarized as follows: externally mounted oil seal structure, replaceable T-shaped stationary sleeve 2, labyrinth water blocking, centrifugal water throwing, and umbrella-shaped structure. The externally mounted oil seal is convenient for replacement during use; it can be replaced by disassembling the oil seal alone without disassembling the entire machine. Furthermore, the contact surface of the lip 35 faces the ground, allowing mud and water to fall freely and not accumulate near the lip 35. The replaceable T-shaped stationary sleeve 2 replaces the main shaft in bearing wear; only the sleeve is replaced, not the shaft, significantly reducing maintenance costs. Replacing the sleeve also does not require disassembling the entire machine. The labyrinth water blocking mechanism, with the external oil seal 3 and the T-shaped stationary sleeve 2 forming a weir, prevents sewage from entering the bearing cavity. Centrifugal water throwing, as the main shaft 4 rotates, throws mud and water from a smaller radius to a larger radius. The umbrella-shaped structure of the external oil seal 3 prevents the formation of a water collection area at the lip 35. Simultaneously, the design of the two annular protrusions 33 forms a closed space, further preventing sewage from entering.

Claims

1. An intrinsically safe dustproof sealing structure for a drill box, characterized in that: It includes a drill bushing (1), a T-type stationary bushing (2), and an external oil seal (3); The external oil seal (3) includes a metal skeleton (31), an annular elastic sealing base (32), an annular ridge (33), an annular spring (34), and a lip (35). A drill sleeve (1) is provided inside the drill box. The inner wall of one end of the drill sleeve (1) is adapted to the outer side of the drill rod, and the other end is sleeved on the main shaft (4) of the drill box. A T-shaped stationary sleeve (2) is provided on the outer periphery of the drill sleeve near the main shaft (4). The external oil seal (3) is sleeved on the outside of the drill sleeve (1) and the T-shaped stationary sleeve (2). The external oil seal (3) is in the shape of a coaxial ring and has an umbrella-shaped structure with a narrow top and wide bottom along its axial cross section. Its axial cross section forms a first step segment (321) and a second step segment (322) with decreasing diameter from bottom to top. The first step segment (321) and the second step segment (322) are integrally formed and connected to form the annular elastic sealing base (32). At least two annular protrusions (33) are provided on the inner side of the first step segment (321) along the circumferential direction, and there is a gap between the annular protrusions (33). An annular spring groove is opened on the outer side of the first step segment (321) at the corresponding position of the annular protrusions (33), and an annular spring (34) is embedded in the groove. The lip (35) is integrally connected to the bottom of the inner circumferential surface of the first stepped section (321) and is in the shape of an inclined surface; The outer circumferential surface of the second step section (322) is provided with an annular groove, and an L-shaped metal skeleton (31) is embedded in the annular groove. An annular transition slope is provided at the junction of the first step segment (321) and the second step segment (322).

2. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: It also includes a shaft head seal O-ring (5), which is disposed between the main shaft (4) and the drill sleeve (1), and is tightly fitted to the outer periphery of the main shaft (4) and the inner wall of the drill sleeve (1).

3. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: It also includes a drill pipe sealing ring (6), which is fitted between the outer side of the drill pipe and the drill sleeve (1), and is tightly fitted to the outer side of the drill pipe and the inner side of the drill sleeve (1).

4. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: It also includes a mudguard (7) and an internal hexagonal head screw (8), wherein the mudguard (7) is located on the outside of the drill box body and has a through hole on it; The T-shaped stationary sleeve (2) is set on the outside of the main shaft (4), and its axial inner side is tightly fitted with the housing of the main shaft (4). A through hole is provided on its radial side, which is adapted to the through hole of the mudguard (7). The internal hexagonal head screw (8) passes through the through holes of the mudguard (7) and the T-shaped stationary sleeve (2), fixing the two components to the drill box body in sequence.

5. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: The annular protrusion (33) of the first step section (321) of the external oil seal (3) fits against the outer side of the T-shaped stationary sleeve (2); its second step section (322) is fixed to the outer periphery of the drill sleeve (1) by a metal skeleton (31).

6. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: The T-shaped stationary sleeve (2) has a lubricating surface on its outer side.

7. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: It also includes an O-ring (9), which is disposed between the T-shaped stationary sleeve (2) and the surface of the drill box body.

8. The intrinsically safe dustproof sealing structure for a drill box according to claim 1, characterized in that: It also includes a skeleton oil seal (10), which is disposed on the radial inner side of the T-shaped stationary sleeve (2) and positioned between the drill box housing and the spindle (4).

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