A quick replacement device for a continuous miner cutting drum

Abstract

The utility model discloses a kind of quick replacement device for continuous coal cutter cutting drum, belong to coal mining equipment technical field, including rack connecting part, drum connecting part, hydraulic drive mechanism, the front end of rack connecting part is provided with hollow conical centering shaft, the inner chamber of conical centering shaft is conical surface;Conical centering shaft's inner chamber coaxially is provided with expansion mandrel, and drum connecting part is provided with conical centering hole;The fixed end of hydraulic drive mechanism is connected on rack connecting part, and the driving end of hydraulic drive mechanism is connected on the rear end face of expansion mandrel.This utility model realizes automatic centering by conical centering shaft and conical centering hole cooperation, when hydraulic drive mechanism promotes expansion mandrel axial movement, by the interaction between two conical surfaces, force conical centering shaft to produce radial elastic expansion, to form interference fit with drum connecting part, realize the quick, rigid locking of cutting drum;It is easy and safe to operate, greatly improves coal mining operation efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of coal mining equipment, and in particular to a quick-change device for the cutting drum of a continuous coal mining machine. Background Technology

[0002] Continuous mining machines are core equipment for efficient modern coal mining. Their cutting drum is traditionally fixed to the end of the cutting arm via a flange and dozens of high-strength bolts. This connection method reveals numerous drawbacks under harsh underground working conditions: 1) Disassembling and installing dozens of pre-tightened high-strength bolts requires workers to expend a lot of physical strength and time. It usually takes 2 to 3 hours to replace a drum, which seriously affects the continuity and efficiency of mine production.

[0003] 2) Workers need to operate heavy-duty wrenches for disassembly, and the bolts are at risk of breaking due to long-term exposure to high alternating loads. More seriously, the damp and dusty environment underground can easily cause the bolts to rust and seize, often requiring dangerous methods such as gas cutting during disassembly.

[0004] 3) Bolts are prone to fatigue fracture or preload failure under long-term high alternating loads, posing a safety hazard.

[0005] Therefore, there is an urgent need in the field for a cutting drum replacement device that can achieve fast, safe, and reliable connection and separation, so as to fundamentally solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a quick replacement device for the cutting drum of a continuous coal mining machine, which achieves fast and reliable connection and separation through internal hydraulic expansion, fundamentally overcoming the defects of bolted connections.

[0007] To achieve the above objectives, this utility model provides a quick-change device for the cutting drum of a continuous coal mining machine, including a frame connecting part, a drum connecting part, and a hydraulic drive mechanism. A hollow conical centering shaft is provided at the front end of the frame connecting part. The conical centering shaft has an outer wall capable of radial elastic deformation, and its inner cavity is configured as a conical surface. An expansion mandrel is coaxially arranged within the inner cavity of the conical centering shaft. The expansion mandrel is shaped as a truncated cone that matches the inner conical surface of the conical centering shaft, and the minimum outer diameter of the expansion mandrel is greater than the minimum inner diameter of the conical centering shaft. The roller connecting part is provided with a tapered centering hole that is adapted to the tapered centering shaft; the fixed end of the hydraulic drive mechanism is connected to the frame connecting part, and the driving end of the hydraulic drive mechanism is connected to the rear end face of the expansion mandrel, for providing a driving force to move the expansion mandrel axially. The expansion mandrel is configured such that, when driven to move axially, it can force the conical centering shaft to expand radially through a conical surface fit, so that the conical centering shaft and the conical centering hole of the roller connection part form an interference fit.

[0008] Preferably, to ensure the expansion and locking effect, the dimensional relationship between the components satisfies the following: in the initial state, there is a radial gap between the expansion mandrel as a whole and the inner conical surface of the conical centering shaft; and the minimum outer diameter of the expansion mandrel is greater than the minimum inner diameter of the front end of the conical centering shaft.

[0009] Preferably, the hydraulic drive mechanism is configured as a hydraulic cylinder, and the piston rod of the hydraulic cylinder is drivenly connected to the rear end face of the expansion mandrel.

[0010] Preferably, a plurality of circumferentially distributed anti-torsion pins are provided between the frame connecting part and the roller connecting part. The anti-torsion pins are interference-fitted with the frame connecting part and clearance-fitted with the roller connecting part.

[0011] Preferably, a sealing groove is provided on the mating end face of the frame connecting part and the roller connecting part, and a sealing ring is installed in the sealing groove.

[0012] Preferably, wear-resistant liners are provided on the exposed surfaces of the frame connecting part and the roller connecting part.

[0013] Preferably, the frame connection portion is provided with a lubrication channel for supplying lubricating grease to the inner conical surface of the conical centering shaft.

[0014] Preferably, the front end of the tapered centering shaft is provided with an annular deformation limiting step; the inner diameter of the deformation limiting step is 0.2~0.5mm smaller than the minimum outer diameter of the expansion mandrel, so as to limit the maximum expansion of the tapered centering shaft and prevent it from undergoing plastic deformation.

[0015] Therefore, the quick-change device for the cutting drum of a continuous coal mining machine, which adopts the above-described structure, has the following beneficial effects: (1) One-click locking and unlocking is achieved by hydraulic drive, which shortens the replacement time of the cutting drum from the traditional 2 to 3 hours, greatly improving the equipment uptime and production efficiency.

[0016] (2) By utilizing the principle of internal expansion, the tapered centering shaft and the tapered centering hole form a large-area interference fit, resulting in uniform contact stress and connection stiffness far exceeding that of traditional bolt connections, effectively suppressing cutting vibration.

[0017] (3) The conical surface fit has an automatic centering function, which ensures the installation accuracy of the cutting roller and helps to ensure the quality of the roadway cutting section; the entire operation process does not require workers to carry out high-intensity and high-risk disassembly and assembly operations, and also completely eliminates the safety hazards caused by bolt corrosion and seizure.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the tapered centering shaft according to an embodiment of the present invention; Figure label: 1. Frame connecting part; 2. Tapered centering shaft; 3. Deformation limiting step; 4. Roller connecting part; 5. Tapered centering hole; 6. Hydraulic drive mechanism; 7. Anti-torsion pin; 8. Expansion mandrel. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example See Figure 1 , Figure 2The quick-change device provided by this utility model has a frame connecting part 1 fixedly installed at the end of the cutting arm of a coal mining machine by high-strength bolts. A tapered centering shaft 2 is installed at the front end of the frame connecting part 1. The tapered centering shaft 2 is a hollow structure with an outer wall capable of radial elastic deformation. The thickness of the outer wall is carefully designed and can be made of high-strength alloy steel with a yield strength of not less than 800MPa. After heat treatment, it has excellent elastic deformation capacity, ensuring that it can elastically expand and recover under radial force. The inner cavity of the tapered centering shaft 2 is preferably machined into a tapered surface with a taper of 1:8.

[0023] The expansion mandrel 8 is coaxially placed inside the tapered centering shaft 2, and its shape is a matching truncated cone. To ensure the expansion and locking effect, the dimensional relationships between the components satisfy the following: in the initial state, there is a radial clearance between the expansion mandrel 8 as a whole and the inner conical surface of the tapered centering shaft 2; and the minimum outer diameter of the expansion mandrel 8 is greater than the minimum inner diameter of the front end of the tapered centering shaft 2, with the specific dimensions determined according to the actual application.

[0024] The hydraulic drive mechanism 6 includes three hydraulic cylinders circumferentially distributed and embedded in the end face of the frame connection part 1, and maintain synchronized operation through a synchronous hydraulic circuit or mechanical linkage structure. The piston rod of the hydraulic cylinder is connected to the rear end face of the expansion mandrel 8 through a connector, ensuring that the expansion mandrel 8 and the tapered centering shaft 2 are coaxially aligned. The hydraulic cylinders are supplied with oil by the hydraulic station of the coal mining machine itself, and their operation is controlled by solenoid valves integrated in the control system. The hydraulic cylinders are connected to the frame connection part 1 and the end face of the expansion mandrel 8 using conventional connection methods in this field, such as fixing with bolts or other components.

[0025] The roller connecting part 4 is welded or fixed to the center of the end of the cutting roller by bolts, and a tapered centering hole 5 is machined in the center to precisely match the tapered centering shaft 2.

[0026] To ensure the transmission of the large cutting torque, three circumferentially distributed anti-torsion pins 7 are provided between the end faces of the frame connecting part 1 and the roller connecting part 4. These anti-torsion pins 7 are interference-fitted with the pin holes on the frame connecting part 1, so that they are firmly fixed on the frame connecting part 1; while they are clearance-fitted with the pin holes on the roller connecting part 4. The interference and clearance are determined according to the actual situation to ensure easy separation during disassembly.

[0027] A sealing groove and a sealing ring are provided on the mating end face of the frame connecting part 1 and the roller connecting part 4 to effectively prevent coal dust and moisture from entering the conical mating surface and ensure long-term reliability. A lubrication channel is machined on the frame connecting part 1, with the outlet located on the inner conical surface of the conical centering shaft 2, allowing for periodic application of grease to reduce friction and wear.

[0028] On the exposed surfaces of the frame connection part 1 and the roller connection part 4, wear-resistant liners made of wear-resistant steel plates with a Brinell hardness of not less than 400HB (not shown separately in the figure) are fixed by bolts to protect the base structure from coal and rock abrasion.

[0029] Furthermore, at the very front end of the tapered centering shaft 2, an annular deformation limiting step 3 is designed. The inner diameter of this deformation limiting step 3 is larger than the minimum outer diameter of the front end of the expansion mandrel 8. The specific dimensions are determined according to the actual design, thereby precisely limiting the maximum radial expansion of the tapered centering shaft 2 and preventing it from undergoing plastic deformation. When the expansion mandrel 8 moves forward, this step can prevent the open end of the tapered centering shaft 2 from expanding excessively through physical contact, thus ensuring that it always works within the elastic deformation range and preventing permanent damage.

[0030] The working principle of the above device is as follows: 1) Installation and Locking Process: The cutting drum is hoisted to the installation position. The tapered centering hole 5 of the drum connecting part 4 is aligned and fitted onto the tapered centering shaft 2 of the frame connecting part 1 until the end faces are in contact. Simultaneously, the anti-torsion pin 7 is inserted into the corresponding pin hole. The operator issues a locking command via remote control (this electrical connection uses conventional methods in this field). The piston rod of the hydraulic cylinder extends synchronously, pushing the expansion mandrel 8 towards the smaller end of the tapered centering shaft 2. The tapered surface of the expansion mandrel 8 and the inner tapered surface of the tapered centering shaft 2 generate relative movement, converting the axial thrust into a huge radial pressure, forcing the tapered centering shaft 2 to elastically expand. Ultimately, it forms an interference fit with the tapered centering hole 5 of the drum connecting part 4, achieving rigid locking. When the front end of the expansion mandrel 8 abuts against the deformation limiting step 3, the expansion process is forcibly terminated, ensuring the expansion amount is within a safe range.

[0031] 2) Disassembly and loosening process: When the roller needs to be replaced, control the hydraulic cylinder to reverse its movement, the piston rod retracts, and pulls the expansion mandrel 8 back towards the larger end. The radial pressure disappears, and the tapered centering shaft 2 returns to its original shape due to its own elasticity, shrinking radially and releasing the locking force. The roller connecting part 4 can then be easily removed, completing the quick disassembly.

[0032] Therefore, this utility model provides a quick replacement device for the cutting drum of a continuous coal mining machine. It achieves automatic centering through the cooperation of a tapered centering shaft and a tapered centering hole. When the hydraulic drive mechanism pushes the expansion mandrel axially, the interaction between the two tapered surfaces forces the tapered centering shaft to undergo radial elastic expansion, thus forming an interference fit with the drum connection. This results in uniform contact stress and connection rigidity far exceeding that of traditional bolt connections, effectively suppressing cutting vibration. It also enables rapid and rigid locking of the cutting drum; operation is simple and safe, greatly improving the efficiency and safety of coal mining operations.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A quick-change device for the cutting drum of a continuous coal mining machine, characterized in that: The device includes a frame connecting part, a roller connecting part, and a hydraulic drive mechanism. The front end of the frame connecting part is provided with a hollow conical centering shaft. The conical centering shaft has an outer wall capable of radial elastic deformation, and its inner cavity is configured as a conical surface. An expansion mandrel is coaxially arranged within the inner cavity of the conical centering shaft. The shape of the expansion mandrel is configured as a truncated cone adapted to the inner conical surface of the conical centering shaft. The minimum outer diameter of the expansion mandrel is greater than the minimum inner diameter of the conical centering shaft. The roller connecting part is provided with a tapered centering hole that is adapted to the tapered centering shaft; the fixed end of the hydraulic drive mechanism is connected to the frame connecting part, and the driving end of the hydraulic drive mechanism is connected to the rear end face of the expansion mandrel.

2. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: The hydraulic drive mechanism is configured as a hydraulic cylinder, and the piston rod of the hydraulic cylinder is driven to be connected to the rear end face of the expansion mandrel.

3. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: A plurality of circumferentially distributed anti-torsion pins are provided between the frame connecting part and the roller connecting part. The anti-torsion pins are interference-fitted with the frame connecting part and clearance-fitted with the roller connecting part.

4. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: A sealing groove is provided on the mating end face of the frame connecting part and the roller connecting part, and a sealing ring is installed in the sealing groove.

5. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: Wear-resistant liners are provided on the exposed surfaces of the frame connection part and the roller connection part.

6. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: The frame connection is provided with a lubrication channel for supplying lubricating grease to the inner conical surface of the conical centering shaft.

7. A quick-change device for the cutting drum of a continuous coal mining machine according to claim 1, characterized in that: The front end of the tapered centering shaft is provided with an annular deformation limiting step; the inner diameter of the deformation limiting step is smaller than the minimum outer diameter of the expansion mandrel.

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