Built-in automatic clutch hydraulic motor chain tightening device

Abstract

The present invention relates to the field of complete equipment and technology for underground working faces in coal mines, and more specifically to a hydraulic motor chain tightening device for underground working face conveyors in coal mines. The chain tightening device is composed of a fixed plate, a hydraulic motor, a connecting plate, a cover tube, a clutch, a rolling bearing, an elastic coupling, a reducer, and the like. The hydraulic motor chain tightening device is activated when the permanent magnet variable frequency motor of the working face conveyor is powered off, and the clutch is engaged by pressurizing the pressure liquid, and the hydraulic motor drives the reducer through the clutch, and finally drives the sprocket to achieve the purpose of chain tightening. The hydraulic motor, the clutch, and the reducer are embedded in the permanent magnet variable frequency motor, and a hydraulic control valve group is used to sequentially control the clutch engagement, the hydraulic motor rotation, and the braking, so that the hydraulic motor chain tightening device can achieve automatic engagement and disengagement.

Description

Technical field:

[0002] The invention relates to the field of complete equipment and technology for underground working surfaces in coal mines, in particular to a hydraulic motor chain tightening device for tightening chains on heavy-duty scraper conveyors. Background technology:

[0004] The application of permanent magnet variable frequency motors in heavy-duty scraper conveyors has become an industry-leading technology due to its advantages of high efficiency, energy saving, low noise, maintenance-free, large output torque, smooth start-up, compact structure, and small size. At present, the permanent magnet variable frequency motors on heavy-duty scraper conveyors have greatly reduced the speed and simplified the gear reduction part to a primary planetary structure, which has become the latest development direction of scraper conveyor transmission technology.

[0005] As the speed is greatly reduced, the outer diameter of the permanent magnet variable frequency motor is also significantly increased. In order to meet the requirements of the narrow space of the underground working surface of the coal mine, the large-diameter permanent magnet variable frequency motor and the first-stage planetary gear reduction mechanism are fully integrated into an integrated design, which makes the traditional hydraulic motor chain tightening device have nowhere to "stay".

[0006] While the outer diameter of the permanent magnet variable frequency motor increases, the main shaft inside it can exist as a hollow shaft with a larger aperture. At least 1600kW permanent magnet variable frequency motors have such conditions. In order to solve the above problems, the internal space of the permanent magnet variable frequency motor main shaft is fully utilized and an embedded automatic clutch hydraulic motor chain tightening device is designed. Summary of the invention:

[0008] The purpose of the present invention is to solve the problem that it is difficult to configure a traditional hydraulic motor chain tightening device for a transmission device using a highly integrated transmission device with a low-speed large-diameter permanent magnet variable frequency motor.

[0009] The object of the present invention is achieved through the following technical solution: a built-in automatic clutch chain tightening device,

[0010] It consists of a fixed plate 1, a hydraulic motor 2, a connecting plate 3, a cover tube 4, a clutch 5, a rolling bearing 6, an elastic coupling 7 and a reducer 8.

[0011] The chain tightening device is completely embedded inside the permanent magnet variable frequency motor. The housing of the hydraulic motor 2 is fixed to the housing of the permanent magnet variable frequency motor through a fixed disk 1, and the output shaft of the reducer 8 is connected to the main shaft of the permanent magnet variable frequency motor through a spline. The housing of the hydraulic motor 2 and the housing of the reducer 8 are rigidly connected through a cover tube 4, and the main shaft of the hydraulic motor 2 and the input shaft of the reducer 8 are connected through a clutch 5 inside the cover tube 4. The clutch 5 controls the engagement and separation of the power transmission through hydraulic pressure, and the boost engagement and pressure relief separation. The connection and disconnection of the hydraulic motor 2 and the working face conveyor transmission system are achieved by the clutch 5 through hydraulic control. The pressure fluid required by the clutch 5 is axially fed in through the rear end of the main shaft of the hydraulic motor 2.

[0012] The beneficial effects of the present invention are mainly manifested in: the hydraulic motor chain tightening device is completely embedded in the permanent magnet variable frequency motor, so that the function of the transmission device equipped with a low-speed large-diameter permanent magnet variable frequency motor is complete, the degree of integration is higher, and the driving source of the hydraulic motor chain tightening device and the working face conveyor transmission system are automatically clutched. Description of the drawings:

[0014] The accompanying drawings constituting the present invention are used to provide a further understanding of the invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 Cross-sectional view of the built-in automatic clutch chain tightening device

[0016] Figure 2 Cross-sectional view of the clutch

[0017] Figure 3 Cross-sectional view of elastic coupling

[0018] The numbers in the figure are: 1. fixed plate, 2. hydraulic motor, 3. coupling plate, 4. cover tube, 5. clutch, 6. rolling bearing, 7. elastic coupling, 8. reducer, 71. active plate, 72. elastic block, 73. passive plate Specific implementation method:

[0020] The technical solution of the present invention is fully and clearly described below in conjunction with the accompanying drawings of the present invention.

[0021] like Figure 1 to Figure 3 As shown in the figure, the built-in automatic clutch hydraulic motor chain tightening device is composed of a fixed plate 1, a hydraulic motor 2, a connecting plate 3, a cover tube 4, a clutch 5, a rolling bearing 6, an elastic coupling 7 and a reducer 8. The elastic coupling 7 is composed of an active plate 71, an elastic block 72 and a passive plate 73.

[0022] Inside the permanent magnet variable frequency motor, the coupling plate 3 is fixed to the flange at the front end of the hydraulic motor 2, one end of the cover tube 4 is fixedly connected to the coupling plate 3, and the other end of the cover tube 4 is fixedly connected to the flange of the reducer 8, so as to realize the rigid connection between the housing of the hydraulic motor 2 and the housing of the reducer 8. The housing of the hydraulic motor 2 is fixed to the housing of the permanent magnet variable frequency motor through the fixed plate 1, so as to realize the static support of the housing of the hydraulic motor 2 and the housing of the reducer 8. The output shaft of the reducer 8 is connected to the main shaft of the permanent magnet variable frequency motor through the spline, so as to realize the action output of the chain tightening device. Inside the cover tube 4, the clutch 5 input shaft sleeve is connected to the main shaft of the hydraulic motor 2 through a flat key, so that the torque of the hydraulic motor 2 is input to the clutch 5; the clutch 5 output disc is fixedly connected to the active disc 71 of the elastic coupling 7, so that the torque of the hydraulic motor 2 is output from the clutch 5; the active disc 71 of the elastic coupling 7 and the passive disc 73 transmit the torque through the elastic block 72; the active disc 71 of the elastic coupling 7 is supported on the main shaft of the hydraulic motor 2 through the rolling bearing 6, so as to ensure that the clutch 5 output disc can rotate stably; the passive disc 73 of the elastic coupling 7 is fixedly connected to the input shaft of the reducer 8, so as to input the torque of the hydraulic motor 2 to the reducer 8.

[0023] Clutch 5 controls the engagement and disengagement of the power transmission through hydraulic pressure, engaging during pressure increase and disengaging during pressure relief.

[0024] When the permanent magnet variable frequency motor is powered off, the pressure fluid enters from the rear end of the hydraulic motor 2, and enters the clutch 5 through the main shaft of the hydraulic motor 2. The pressure fluid is pressurized, the clutch is engaged, and then the hydraulic motor 2 is started. The torque of the hydraulic motor 2 is transmitted to the reducer 8 through the clutch 5 and the elastic coupling 7. The torque of the hydraulic motor 2 is amplified by the reducer 8 and transmitted to the main shaft of the permanent magnet variable frequency motor, thereby driving the sprocket of the working face conveyor to tighten the chain. After the chain is tightened, the hydraulic motor 2 is turned off, the pressure fluid in the clutch 5 is relieved, the clutch 5 is separated, and the main shaft of the hydraulic motor 2 and the main shaft of the permanent magnet variable frequency motor are mechanically disconnected. Then the permanent magnet variable frequency motor can be safely powered on to drive the working face conveyor.

[0025] The embedded automatic clutch chain tightening device is equipped with a dedicated hydraulic control valve group. The safe operation process of "permanent magnet variable frequency motor power off → clutch engagement → hydraulic motor fluid flow → hydraulic motor forward rotation → hydraulic motor brake → hydraulic motor reverse → hydraulic motor fluid cut-off → clutch separation → permanent magnet variable frequency motor power on" is specified, and the hydraulic control valve group controls the key process of "clutch engagement → hydraulic motor fluid flow → hydraulic motor forward rotation → hydraulic motor brake → hydraulic motor reverse → hydraulic motor fluid cut-off". The hydraulic control valve group is designed to realize "hydraulic motor opening" and "pressure fluid boosting inside the clutch" at the same time, "hydraulic motor closing" and "pressure fluid relief inside the clutch" at the same time, thus realizing the "automatic clutch" of the embedded automatic clutch hydraulic motor chain tightening device.

[0026] It should be understood that the detailed description of the technical solution of the present invention by means of the preferred embodiments is illustrative rather than restrictive. A person skilled in the art may modify the technical solution described in the embodiments based on reading the specification of the present invention, or replace some of the technical features therein by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present invention.

Claims

1. Built-in automatic clutch hydraulic motor chain tightening device, characterized by: It is composed of a fixed plate (1), a hydraulic motor (2), a coupling plate (3), a cover tube (4), a clutch (5), a rolling bearing (6), an elastic coupling (7) and a reducer (8); the main shaft inside the permanent magnet variable frequency motor is in the form of a hollow shaft with a larger aperture, the chain tightening device is completely embedded in the hollow shaft of the permanent magnet variable frequency motor, the housing of the hydraulic motor (2) is fixed to the housing of the permanent magnet variable frequency motor through the fixed plate (1), and the output shaft of the reducer (8) is connected to the main shaft of the permanent magnet variable frequency motor through a spline; The coupling disc (3) is fixed on the flange at the front end of the hydraulic motor (2); one end of the cover tube (4) is fixedly connected to the coupling disc (3); the other end of the cover tube (4) is fixedly connected to the flange of the reducer (8); the output shaft of the reducer (8) is connected to the main shaft of the permanent magnet variable frequency motor through a spline; the output disc of the clutch (5) is fixedly connected to the active disc (71) of the elastic coupling (7); the active disc (71) of the elastic coupling (7) and the passive disc (73) transmit torque through an elastic block (72); the active disc (71) of the elastic coupling (7) is supported on the main shaft of the hydraulic motor (2) through a rolling bearing (6); and the passive disc (73) of the elastic coupling (7) is fixedly connected to the input shaft of the reducer (8).

2. The built-in automatic clutch hydraulic motor chain tightening device according to claim 1 is characterized by: The housing of the hydraulic motor (2) and the housing of the reducer (8) are rigidly connected via a cover tube (4), and the main shaft of the hydraulic motor (2) and the input shaft of the reducer (8) are connected inside the cover tube (4) via a clutch (5).

3. The built-in automatic clutch hydraulic motor chain tightening device according to claim 1 is characterized by: The pressure fluid required for the clutch (5) is fed axially through the rear end of the main shaft of the hydraulic motor (2).

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