A position limiting protection device for a coal mining machine transmission shaft

Abstract

The utility model discloses a kind of limit protection devices of coal winning machine transmission shaft, to avoid coal winning machine misoperation to cause motor damage, including transmission shaft, handle shaft, baffle, round nut, round nut stop washer and pin, thread and keyway are set on handle shaft, after transmission shaft, bearing and handle shaft are assembled, round nut stop washer is installed through keyway, then round nut is screwed, finally handle shaft assembly is connected with baffle, the structure is used as axial limit by round nut, make transmission shaft and baffle keep safe distance, avoid the operation when transmission shaft is not sent into working position to cause its friction with baffle and damage motor, while round nut stop washer and pin form double anti-loosening structure, ensure that limit is reliable.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing, specifically a structure that relies on adding a limiting device and preventing the limiting device from loosening. Background Technology

[0002] Coal mining machine motors typically employ a hollow shaft coupled with a drive shaft to output power. Both ends of the drive shaft have external splines; the input end engages with the motor's internal spline, and the output end engages with the coal mining machine's gearbox. During maintenance and repair, the motor must be de-energized, and the drive shaft's output end must be disengaged from the gearbox using a lever device. At this time, the input end of the drive shaft remains engaged with the motor. In traditional designs, the axial movement of the drive shaft is achieved by the end of the drive shaft and a retaining cover. After maintenance, the drive shaft should be pushed into the working position before power is applied. This step often results in misoperation due to negligence, causing the drive shaft to rub against the motor's retaining cover. Failure to detect this promptly can damage the motor. Utility Model Content

[0003] To solve the above problems, this utility model discloses a limit protection device for the transmission shaft of a coal mining machine.

[0004] The specific technical solution is as follows:

[0005] A limit protection device for a coal mining machine drive shaft includes a drive shaft, a handle shaft, a cover, a round nut, a round nut stop washer, and a pin.

[0006] The handle shaft has an external thread section on its shaft body, and an axial keyway is machined on the external thread section;

[0007] The drive shaft, bearing, and handle shaft are coaxially assembled to form a transmission assembly;

[0008] The round nut retaining washer is embedded in the keyway and installed on the external thread section of the handle shaft;

[0009] The round nut is screwed into the external thread section of the handle shaft and presses the round nut locking washer;

[0010] The pin passes through the locking hole between the handle shaft and the round nut locking washer;

[0011] After the handle shaft passes through the cover and handle assembly in sequence, the axial displacement of the drive shaft is restricted by the round nut, so that a safe distance is maintained between the end of the drive shaft and the cover.

[0012] The round nut retaining washer is circumferentially positioned by a keyway and locked by a pin, forming a double anti-loosening structure.

[0013] The cover is fixed to the motor end cover. The handle shaft passes through the cover and is connected to the handle assembly. When the drive shaft is not reset to the working position, the round nut abuts against the inner side of the cover to maintain a safe clearance.

[0014] The advantages of this utility model are: by adding a round nut as an axial limiting component, and in conjunction with the round nut locking washer and pin embedded in the keyway to form a double anti-loosening structure, a safe distance between the end of the transmission shaft and the cover is forcibly maintained while fully preserving the original transmission function, thus completely avoiding friction damage caused by accidental motor start-up due to failure to reset the transmission shaft after maintenance; at the same time, the limiting structure is compact and easy to install, and only requires modification of the handle shaft to adapt to traditional motors, significantly improving equipment reliability and reducing maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the handle shaft structure.

[0016] Figure 2 This is a schematic diagram of the overall assembly of the device;

[0017] Figure 3 This is a schematic diagram of a round nut structure;

[0018] Figure 4 This is a schematic diagram of the structure of a round nut retaining washer.

[0019] Figure 5 This is a schematic diagram of the cover structure;

[0020] Figure 6 This is a schematic diagram of the limit position when the drive shaft is out of the working position. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] A limit protection device for a coal mining machine drive shaft includes a drive shaft 1, a handle shaft 6, a cover 7, a round nut 4, a round nut stop washer 3, and a pin 5.

[0023] The handle shaft 6 has an external thread section on its shaft body, and an axial keyway is machined on the external thread section of the handle shaft 6.

[0024] The drive shaft 1, bearing 2 and handle shaft 6 are coaxially assembled to form a transmission assembly;

[0025] The round nut retaining washer 3 is embedded in the keyway and installed on the external thread section of the handle shaft 6;

[0026] The round nut 4 is screwed onto the external thread section of the handle shaft 6 and presses the round nut locking washer 3;

[0027] The pin 5 passes through both the radial hole of the handle shaft 6 and the locking hole of the stop washer 3, achieving dual locking in both the circumferential and axial directions;

[0028] After the handle shaft 6 passes through the cover 7 and the handle assembly 8 in sequence, the axial displacement of the transmission shaft 1 is restricted by the round nut 4, so that a safe distance is maintained between the end of the transmission shaft 1 and the cover 7.

[0029] The round nut retaining washer 3 achieves circumferential positioning through the keyway and is locked by the pin 5, forming a double anti-loosening structure.

[0030] The cover 7 is fixed to the motor end cover. The handle shaft 6 passes through the cover 7 and is connected to the handle assembly 8. When the transmission shaft 1 is not reset to the working position, the round nut 4 abuts against the inner side of the cover 7 to maintain a safe clearance.

[0031] The working principle of this utility model is as follows: During maintenance, the handle assembly 8 is manually pulled, causing the handle shaft 6 and the transmission shaft 1 to move axially, disengaging the output end of the transmission shaft 1 from the gearbox, while the input end of the transmission shaft remains engaged with the motor. At this time, the round nut 4 moves backward synchronously with the handle shaft 6 until the end face of the round nut 4 presses against the inner side of the cover 7 to form a hard limit, forcibly preventing the transmission shaft 1 from moving further backward, ensuring that a constant safe gap is maintained between the end of the transmission shaft 1 and the cover 7. This prevents the round nut 4 from shifting during frequent maintenance operations, completely eliminating the possibility of accidental slippage or mis-starting of the transmission shaft 1. To mitigate the risk of frictional damage, if the transmission shaft is not reset after the coal mining machine is repaired, and the operator accidentally starts the motor, the handle shaft 6 will drive the transmission shaft 1 to rotate. At this time, the round nut 4 forms a rigid limit by pressing against the inner side of the cover 7, which forcibly prevents the transmission shaft 1 from moving axially towards the cover 7, so that a safe gap is always maintained between the end of the transmission shaft 1 and the cover 7 to avoid frictional damage. At the same time, the round nut locking washer 3 achieves circumferential locking through the keyway, and the pin 5 passes through the locking washer and the handle shaft. The double anti-loosening mechanism ensures that the round nut 4 will not loosen under long-term vibration, and the limiting function is durable and reliable.

Claims

1. A limit protection device for the transmission shaft of a coal mining machine, characterized in that: Includes drive shaft (1), handle shaft (6), cover (7), round nut (4), round nut locking washer (3) and pin (5); The handle shaft (6) has an external thread section on its shaft body, and an axial keyway is machined on the external thread section; The drive shaft (1), bearing (2) and handle shaft (6) are coaxially assembled to form a transmission assembly; The round nut retaining washer (3) is embedded in the keyway and installed on the external thread section of the handle shaft (6); The round nut (4) is screwed into the external thread section of the handle shaft (6) and presses the round nut stop washer (3). The pin (5) passes through the locking hole between the handle shaft (6) and the round nut stop washer (3); After the handle shaft (6) passes through the cover (7) and the handle assembly (8) in sequence, the axial displacement of the transmission shaft (1) is restricted by the round nut (4) so ​​that a safe distance is maintained between the end of the transmission shaft (1) and the cover (7).

2. The limit protection device for the transmission shaft of the coal mining machine according to claim 1, characterized in that: The round nut retaining washer (3) is circumferentially positioned by the keyway and locked by the pin (5), forming a double anti-loosening structure.

3. The limit protection device for the transmission shaft of the coal mining machine according to claim 1, characterized in that: The cover (7) is fixed to the motor end cover. The handle shaft (6) passes through the cover (7) and is connected to the handle assembly (8). When the transmission shaft (1) is not reset to the working position, the round nut (4) abuts against the end face of the cover (7) facing the inside of the motor.

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