A fully automatic tight-chain permanent magnet drive system

Abstract

The present invention relates to the technical field of coal mine comprehensive mining conveyor drive systems, specifically a fully automatic chain tightening permanent magnet drive system, comprising a permanent magnet semi-direct drive motor and a fully automatic chain tightening system. The fully automatic chain tightening system comprises a motor chain tightening reducer, an electro-hydraulic control system, a connecting cover and an output gear. The fully automatic chain tightening system is arranged at the tail of the permanent magnet semi-direct drive motor, taking up very little space. By operating the electro-hydraulic control system, the idler wheel of the motor chain tightening reducer and the output gear at the tail of the motor can be automatically engaged and disengaged. After engagement, the conveyor chain is automatically tensioned, and brakes are applied after tensioning to the program setting value. The present invention solves the problem that permanent magnet drive conveyors are currently unable to tighten the chain and brake, and enables the permanent magnet semi-direct drive system to be reliably used in conveyors.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine fully mechanized mining conveyor drive systems, in particular to a fully automatic tight-chain permanent magnet drive system. Background Art

[0002] With the development of intelligent underground coal mines and the demand for high efficiency and energy conservation, permanent magnet variable frequency motors have been widely used in coal mine conveying equipment. However, the permanent magnet variable frequency motors currently used are basically the same as ordinary asynchronous variable frequency motors in terms of speed and external dimensions. In addition, a reducer and hydraulic tensioning device are still required between the motor and the conveyor, resulting in a very long transmission chain. Their only advantage is that they have a higher power factor and efficiency than ordinary motors. The existing technology has a permanent magnet semi-direct drive system that reduces motor speed, significantly reduces the number of transmission links, saves space, and further improves efficiency. However, it currently cannot realize the functions of automatic chain tightening and braking, so it cannot be actually applied to conveyors. Therefore, it is necessary to add a fully automatic chain tightening system to the permanent magnet semi-direct drive motor so that the entire drive system not only meets the actual use requirements of the conveyor, but also further enhances the digital intelligence level of the entire equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a fully automatic chain tightening permanent magnet drive system, which adds a fully automatic chain tightening system on the basis of a permanent magnet semi-direct drive motor to solve the problem that the permanent magnet semi-direct drive system cannot tighten the chain and brake.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] The present invention discloses a fully automatic chain tightening permanent magnet drive system, comprising a permanent magnet semi-direct drive motor and a fully automatic chain tightening system. The fully automatic chain tightening system comprises a motor chain tightening reducer, an electro-hydraulic control system, a connecting cover and an output gear. A hole is provided on one side of a housing assembly in the motor chain tightening reducer, a hydraulic cylinder piston rod in the electro-hydraulic control system is inserted into the hole and fixed with a nut, the other side of the housing assembly of the motor chain tightening reducer is connected to the pin seat of the connecting cover through a pin shaft, the protective cover of the electro-hydraulic control system is connected to the top plate of the connecting cover with bolts, the connecting cover is connected to the tail end face of the permanent magnet semi-direct drive motor with bolts, the output gear is connected to the shaft extending from the tail of the permanent magnet semi-direct drive motor with a spline and is axially fixed with a spring retaining ring for the shaft.

[0006] Furthermore, the motor chain reducer includes a digital motor, an input tie rod assembly, a second shaft, an idler shaft and a housing assembly. The digital motor is connected to the housing assembly with bolts, the output shaft of the digital motor is splined to the sun gear of the input tie rod assembly, the input tie rod assembly is splined to the second shaft, the second shaft and the idler shaft are supported on the housing assembly through bearings and axially fixed through bearing covers, and an idler is provided on the idler shaft.

[0007] Furthermore, the electro-hydraulic control system includes a hydraulic cylinder, an electro-hydraulic control valve group, a protective cover and a travel switch. The hydraulic cylinder barrel assembly, the electric control valve group and the travel switch are all fixed to the protective cover with bolts. The electro-hydraulic control valve group is provided with two sets of inlet and return liquid interfaces. The two sets of interfaces work independently. One set is connected to the hydraulic cylinder through a high-pressure hose, and the other set is connected to the digital motor through a high-pressure hose.

[0008] Furthermore, a window is opened on the top plate of the connection cover and a pin seat is provided.

[0009] Furthermore, the idler gear on the idler shaft passes through the window of the coupling cover and meshes with the output gear.

[0010] Furthermore, the electro-hydraulic control valve group is provided with another set of total inlet and return liquid interfaces, which are connected to the coal mine underground pump station with a high-pressure hose. The electro-hydraulic control valve group is connected to the coal mine underground electric control box through a steel wire armored cable and can be controlled to open and close.

[0011] The beneficial effects of the present invention are mainly manifested in:

[0012] Based on the permanent magnet semi-direct drive system, a fully automatic chain tightening system has been added, occupying a very small space at the rear of the permanent magnet motor. This system automatically engages and disengages the idler gear of the motor's chain tightening reducer with the output gear at the rear of the motor. Once engaged, it automatically tensions the conveyor chain and brakes when tension reaches the programmed value. This solves the current problem of chain tightening and braking in permanent magnet-driven conveyors, enabling the reliable application of permanent magnet semi-direct drive systems in conveyors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings that constitute the present invention are used to provide a further understanding of the present invention. 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:

[0014] Figure 1 This is a general diagram of a fully automatic tight-chain permanent magnet drive system.

[0015] Figure 2 Diagram of the fully automatic motor chain tightening system

[0016] Figure 3 This is the structure diagram of the motor chain reducer

[0017] Figure 4 Electro-hydraulic control system diagram

[0018] Figure 5 The structure diagram of the connection cover

[0019] Figure 6 This is the working diagram of the fully automatic motor chain tightening

[0020] Figure 7 This is a non-working diagram of the fully automatic motor chain tightening.

[0021] Figure: A. Motor chain reducer B. Electro-hydraulic control system C. Coupling cover D. Output gear 1. Digital motor 2. Input tie rod assembly 3. Secondary shaft 4. Idle shaft 5. Housing assembly a. Hole b. Idle pulley 6. Hydraulic cylinder 7. Electronically controlled valve block 8. Protective cover 9. Travel switch d. Window e. Pin holder DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described completely and clearly below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0023] This embodiment provides a fully automatic chain tightening permanent magnet drive system, including a permanent magnet semi-direct drive motor and a fully automatic chain tightening system. The fully automatic chain tightening system includes A. a motor chain tightening reducer, B. an electro-hydraulic control system, C. a coupling cover, and D. an output gear. A hole is provided on one side of the housing assembly 5 in the motor chain tightening reducer. The piston rod 6 of the hydraulic cylinder in the electro-hydraulic control system passes through the hole and is secured with a nut. The other side of the housing assembly 5 in the motor chain tightening reducer is connected to the pin seat e of the coupling cover C via a pin shaft. The protective cover 8 of the electro-hydraulic control system B is bolted to the top plate of the coupling cover C. The coupling cover C is bolted to the rear end face of the permanent magnet semi-direct drive motor. The output gear D is splined to the shaft extending from the rear end of the permanent magnet semi-direct drive motor and axially secured with a spring retaining ring. A. The motor chain tightening reducer includes 1. a digital motor, 2. an input tie rod assembly, 3. a second shaft, 4. an idler shaft, and 5. a housing assembly. The digital motor 1 is bolted to the housing assembly 5. The output shaft of the digital motor 1 is splined to the sun gear of the input tie rod assembly 2. The input tie rod assembly 2 is splined to the second shaft 3. The second shaft 3 is supported on the idler shaft 4 by bearings on the housing assembly 5 and secured axially by a bearing cap. The idler shaft 4 has an idler gear (b). The electro-hydraulic control system B includes the hydraulic cylinder 6, the electronically controlled valve assembly 7, the protective cover 8, and the travel switch 9. The cylinder barrel assembly 6, the electronically controlled valve assembly 7, and the travel switch 9 are all bolted to the protective cover 8. The electronically controlled valve assembly 7 is equipped with two sets of hydraulic inlet and return ports, which operate independently: one connects to the hydraulic cylinder 6 via a high-pressure hose, and the other connects to the digital motor 1 via a high-pressure hose. The top plate of the coupling cover C has a window (d) with a pin holder (e). The idler gear (b) on the idler shaft 4 passes through the window (d) of the coupling cover C and meshes with the output gear (D). 7. The electro-hydraulic control valve group is equipped with another set of total inlet and return liquid interfaces, which are connected to the underground pump station of the coal mine with a high-pressure hose. 7. The electro-hydraulic control valve group is connected to the underground electric control box of the coal mine through a steel wire armored cable, and can be controlled to open and close.

[0024] When the embodiment of the fully automatic chain tightening permanent magnet drive system of the present invention is used, the electric control box in the coal mine opens the electro-hydraulic control valve with one button. Figure 6 In the process, after the 7. electro-hydraulic control valve is opened, the 6. hydraulic cylinder is flushed with liquid. Since there is a hole a on one side of the 5. box assembly in the A. motor chain reducer, the piston rod of the 6. hydraulic cylinder in the B. electro-hydraulic control system is inserted into the hole a and fixed with a nut. The piston rod of the 6. hydraulic cylinder extends to press down the A. motor chain reducer. The A. motor chain reducer rotates around the pin shaft to the top plate of the C. coupling cover and enters the working position. The 6. idler wheel and the D. output gear enter the meshing state, and the 9. travel switch is pressed down at the same time. The 9. travel switch is turned on, and the motor is in a completely power-off state. The 7. electro-hydraulic control valve flushes the 1. digital motor again. The 1. digital motor drives the entire system to slowly rotate the tension chain. When it reaches the stroke or tension set by the program, it automatically stops running. The 1. digital motor brakes. In the process Figure 7 After the chain connection is complete, the electro-hydraulic control valve (7) is opened to retract the piston rod (6) of the hydraulic cylinder, raising the motor chain tightening reducer (A). This disengages the idler pulley (6) from the output gear (D). The travel switch (9) closes, and the motor is energized for normal operation. After the electro-hydraulic control valve (7) is opened, the remaining steps are automated, reliably achieving full automation of the chain tightening process.

[0025] It should be understood that the detailed description of the technical solutions of the present invention using the preferred embodiments above is illustrative and not restrictive. A person skilled in the art, after reading the present specification, may modify the technical solutions described in the embodiments or replace some of the technical features therein with equivalents, and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automatic chain tightening permanent magnet drive system, comprising a permanent magnet semi-direct drive motor and a fully automatic chain tightening system, characterized in that: The fully automatic chain tightening system includes a motor chain tightening reducer (A), an electro-hydraulic control system (B), a connecting cover (C) and an output gear (D); a hole (a) is provided on one side of the housing assembly (5) in the motor chain tightening reducer (A), a piston rod of a hydraulic cylinder (6) in the electro-hydraulic control system (B) is inserted into the hole (a) and fixed with a nut, the other side of the housing assembly (5) of the motor chain tightening reducer (A) is connected to the pin seat (e) of the connecting cover (C) through a pin shaft, and the shield (8) of the electro-hydraulic control system (B) is connected to the top plate of the connecting cover (C) with bolts. The coupling cover (C) is connected to the tail end face of the permanent magnet semi-direct drive motor with bolts, the output gear (D) is connected to the shaft extending from the tail end of the permanent magnet semi-direct drive motor with a spline and is axially fixed with a spring retaining ring; the motor chain reducer (A) includes a digital motor (1), an input tie rod assembly (2), a second shaft (3), an idler shaft (4) and a housing assembly (5); the digital motor (1) is connected to the housing assembly (5) with bolts, the output shaft of the digital motor (1) is connected to the sun gear of the input tie rod assembly (2) with a spline, and the input tie rod assembly (2 ) is spline-connected with the second shaft (3), the second shaft (3) and the idler shaft (4) are supported on the box assembly (5) through bearings and axially fixed through the bearing cover; the idler shaft (4) is provided with an idler (b); the electro-hydraulic control system (B) includes a hydraulic cylinder (6), an electro-hydraulic control valve group (7), a shield (8) and a travel switch (9); the cylinder assembly of the hydraulic cylinder (6), the electro-hydraulic control valve group (7) and the travel switch (9) are all fixed to the shield (8) with bolts, and the electro-hydraulic control valve group (7) is provided with two groups of inlet and return liquid interfaces, and the two groups of interfaces are independent. The hydraulic cylinder (6) and the digital motor (1) are connected to each other through a high-pressure hose. The top plate of the coupling cover (C) is provided with a window (d) and a pin seat (e). The idler (b) on the idler shaft (4) passes through the window (d) of the coupling cover (C) and engages with the output gear (D). The electro-hydraulic control valve group (7) is provided with another group of total inlet and return liquid interfaces, which are connected to the coal mine underground pump station through a high-pressure hose. The electro-hydraulic control valve group (7) is connected to the coal mine underground electric control box through a steel wire armored cable and can be controlled to open and close.

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