Rotary reducer transmission shaft replacement device of roller bit drilling machine

Abstract

This utility model relates to a replacement device for the drive shaft of a rotary gear reducer in a rotary drilling rig. Its features include a double-threaded rod, a hammer disc, a sliding hammer, and a pressure handle. The hammer disc is fixedly mounted on the lower middle part of the double-threaded rod. The pressure handle consists of two handles of the same length symmetrically welded to the double-threaded rod and positioned at the lower part of the hammer disc. The sliding hammer consists of a disc with a central shaft hole and handles at both ends of the disc. The disc is fitted onto the double-threaded rod above the hammer disc and is slidably connected to it. Its advantages are: by engaging the threads or nuts of the double-threaded rod with the disassembly holes of the first and second rotary shafts, the rotary shaft can be extracted. Specifically, the rotation of the threads generates torque, which in turn generates an axial force to disassemble the rotary shaft from the rotary gear reducer housing. This reduces maintenance costs, alleviates the labor intensity of workers, saves time and effort, and is convenient and quick.

Description

Technical Field

[0001] This utility model belongs to the field of mining machinery and equipment, and specifically relates to a replacement device for the drive shaft of the rotary reducer of a rotary drilling rig. Technical Background

[0002] In mining operations, rotary drilling rigs are key equipment, and their operational stability and efficiency have a crucial impact on production efficiency. The slewing gearbox is one of the core working parts of the drilling rig, and the drive shaft is the key component for power transmission within the gearbox. Due to the harsh mining environment, drilling rigs require prolonged high-intensity operation, making the drive shaft highly susceptible to wear. Frequent replacement is therefore essential to ensuring the normal operation of the drilling rig. Traditional drive shaft replacement methods have many drawbacks, severely restricting the improvement of production efficiency and economic benefits. Therefore, exploring a more efficient, convenient, and economical replacement method is of significant practical importance.

[0003] Problems with traditional replacement methods:

[0004] 1. The replacement process is complex, time-consuming, and labor-intensive. Traditionally, replacing the drive shaft requires a 12-ton crane to lift the rotary motor down. This process demands the coordinated efforts of one scaffolder, two fitters, and two electricians, and the entire overhaul typically takes four hours to complete. The deployment and use of the crane not only increases the complexity of the operation but also prolongs the maintenance time, resulting in excessive downtime for the drilling rig and impacting the normal mining progress.

[0005] 2. The operating method poses safety hazards and is prone to damaging the equipment. After the rotary motor is lowered, the maintenance worker must stand above the rotary gearbox and use an iron bar and hammer to loosen and remove the first shaft. This operation requires a high level of skill and physical strength from the maintenance worker, and the high-intensity hammering work in a confined space poses a significant safety risk, easily leading to injury. Furthermore, when the second shaft bearing is severely worn, since there is no suitable part to hammer, it is often necessary to use a gas welder to cut the second shaft for replacement. The gas welding process not only produces a large amount of oil fumes, harming the health of the maintenance worker, but also, if operated improperly, can cut the gearbox body, affecting assembly quality and shortening the gearbox's lifespan. Simultaneously, gas welding results in the loss of spare parts for the second shaft, increasing maintenance costs. Utility Model Content

[0006] The purpose of this invention is to provide a replacement device for the drive shaft of the rotary gear reducer of a rotary drilling rig that can reduce the labor intensity of workers, shorten maintenance time, and enhance safety.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] The present invention relates to a replacement device for the drive shaft of a rotary gear reducer of a roller cone drill, characterized in that it includes a double-ended threaded rod, a hammer disc, a sliding hammer, and a pressure handle. The hammer disc is fixedly disposed in the lower middle part of the double-ended threaded rod. The pressure handle consists of two handles of the same length symmetrically welded onto the double-ended threaded rod and is disposed in the lower part of the hammer disc. The sliding hammer consists of a disc with a central shaft hole and handles disposed at both ends of the disc. The disc is sleeved on the double-ended threaded rod above the hammer disc and is slidably connected to the double-ended threaded rod.

[0009] As a further description of the above technical solution: the double-ended threaded rod is made of a round steel with a length of 1200mm and a diameter of 25mm, and screw threads with a length of 50mm and a diameter of M24mm are machined at both ends of the round steel.

[0010] As a further description of the above technical solution: the hammering disc is located at 900mm of the double-ended threaded rod, and the diameter of the hammering disc is 100mm.

[0011] As a further description of the above technical solution: the distance between the pressure handle and the hammering disc is 200mm.

[0012] The advantages of this utility model are:

[0013] This utility model utilizes a double-threaded rod that engages with the threads or nuts of the disassembly holes of the first and second rotary shafts. By rotating the double-threaded rod to drive the rotary shaft bolts, the rotary shaft is pulled out. In other words, the rotation of the thread generates torque, which in turn generates an axial force to disassemble the rotary shaft from the rotary reducer housing. This reduces maintenance costs, alleviates the labor intensity of workers, saves time and effort, and is convenient and quick. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the slide weight. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2As shown, the replacement device for the drive shaft of the rotary gear reducer of the rotary drill rig of this utility model is characterized by: including a double-ended threaded rod 1, a hammer disc 3, a sliding hammer, and a pressure handle 4. The hammer disc 3 is fixedly installed in the lower middle part of the double-ended threaded rod 1, at a position of 900mm from the double-ended threaded rod 1, and the diameter of the hammer disc is 100mm. The hammer disc serves as a striking plate to withstand the hammering force of the sliding hammer. The pressure handle 4 consists of two handles 200mm long symmetrically welded to the double-ended threaded rod 1, located at the lower part of the hammer disc 3, with a distance of 200mm between it and the hammer disc, making it convenient for maintenance personnel to hold during operation. The sliding hammer consists of a disc 51 with a shaft hole in the middle and handles 52 located at both ends of the disc 51. The disc 51 is fitted onto the double-ended threaded rod 1 on the upper part of the hammer disc 3 and is slidably connected to the double-ended threaded rod 1. The handle 52 is convenient for maintenance personnel to hold and exert force. During disassembly, the drive shaft is pulled out by sliding the sliding hammer on the double-ended threaded rod and hammering the striking plate.

[0018] As a further description of the above technical solution: The double-ended threaded rod 1 of this utility model adopts a round steel with a length of 1200mm and a diameter of 25mm, and screw threads 2 with a length of 50mm and a diameter of M24mm are processed at both ends of the round steel.

[0019] When replacing the drive shaft, first, remove the gearbox cover. At this time, the small and large flat gears of the first and second shafts inside the gearbox will be clearly visible. Next, remove the bearing cover of the first shaft to expose the area below the first shaft. Before installing the drive shaft inside the rotary gearbox, weld an M24mm nut to the bottom of the shaft or drill an M24mm internal thread hole at the center of the bottom end of the shaft. After connecting the end screw thread 2 of the double-threaded rod 1 of the replacement device to the bolt of the first shaft, the maintenance personnel hold the sliding hammer and forcefully and repeatedly strike the hammer plate 3 downwards. Usually, about 8-10 strikes are needed to successfully remove the first shaft.

[0020] When installing a new shaft, first screw this replacement device onto the new shaft, then apply force in the opposite direction to install the new shaft into the gearbox. The entire replacement process requires only two workers, reducing maintenance costs, alleviating the labor intensity of workers, saving time and effort, and is convenient and quick.

Claims

1. A bit-rotary drive shaft replacement device for a rotary reduction gearbox of a rotary drilling rig, characterized in that: The utility model discloses a double-threaded rod, a hammering disc, a slide hammer and a pressure handle. The double-threaded rod is made of a round steel with a length of 1200 mm and a diameter of 25 mm, and a screw buckle with a length of 50 mm and a diameter of M24 mm is processed at both ends of the round steel.

2. The bit-rotary-reducer-shaft-replacement device of claim 1, wherein: The hammering disc is arranged at a position 900 mm away from the double-threaded rod, and the diameter of the hammering disc is 100 mm.

3. The bit-to-rotary-reducer-shaft-replacement device of claim 1, wherein: The distance between the pressure handle and the hammering disc is 200 mm.

4. The bit-to-rotary-reducer-shaft-replacement device of claim 1, wherein: ​

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