A method for testing a coal mining machine reduction gearbox under no-load

Abstract

The application provides a coal cutter reduction gearbox no-load test method, a mechanical connection system is connected with a first shaft of the reduction gearbox after maintenance; the mechanical connection system is started, the first shaft of the reduction gearbox is gradually accelerated to a first preset value, and whether the reduction gearbox leaks oil is detected; the reduction gearbox continuously idles for more than one hour until the oil leakage detection and the sealing detection are completed; the speed of the mechanical connection system is slowly reduced until the first shaft of the reduction gearbox stops rotating; the application simulates high-speed rotation of the coal cutter reduction gearbox under different working conditions, and facilitates detection of sealing conditions and lubricating oil temperature rising conditions of the reduction gearbox in a short time.

Description

Technical Field

[0001] This invention relates to the field of gearbox repair, and in particular to a method for no-load testing of a coal mining machine gearbox. Background Technology

[0002] The coal mining machine is one of the main pieces of equipment in a fully mechanized coal mining system. It evolved from the coal cutter. A coal mining machine is a large and complex system integrating mechanical, electrical, and hydraulic systems. Working in harsh environments, it is a crucial piece of equipment for achieving mechanization and modernization in coal mine production. Mechanized coal mining reduces manual labor, improves safety, and achieves high output, high efficiency, and low consumption. In longwall mining faces, it is a coal mining machine that uses its working mechanism to break coal from the coal seam (coal breaking) and load it into the face conveyor (coal loading). The coal mining machine travels at a set traction speed (traction), enabling the coal breaking and loading processes to proceed continuously.

[0003] A coal mining machine generally consists of a cutting section, a loading section, a traveling section, an electric motor, an operation and control system, and auxiliary devices. When several major components of the entire coal mining machine share a single electric motor, the motor becomes the main independent component of the machine; this motor is often called the main motor. The main motor typically has output shafts at both ends, one driving the cutting section and the other driving the traveling section. It has a box-shaped structure and is connected to adjacent components with fastening bolts to form the machine body. The electric motor must be explosion-proof. Modern coal mining machine motors are water-cooled, with most employing stator water cooling.

[0004] The motor power refers to the rated power of the cutting motor. To match the coal mining speed of the coal mining machine, the motor is usually also connected to a speed reducer. The speed reducer is generally inspected on the ground. The inspection work involves opening the speed reducer box to replace the bearings, and then reinstalling it after the inspection is completed.

[0005] Due to the inevitable defects of poor gearbox sealing or unreasonable temperature rise of lubricating oil in the gearbox during bearing replacement, it is necessary to develop a no-load test method for the gearbox of the coal mining machine to ensure the normal use of the overhauled gearbox in the coal mining machine. Summary of the Invention

[0006] The purpose of this invention is to provide a no-load test method for a coal mining machine gearbox. The method uses a mechanical connection system to drive the gearbox to rotate at different speeds in stages, simulating the high-speed rotation of the coal mining machine gearbox under different working conditions. This allows for convenient testing of the gearbox's sealing condition and lubricating oil temperature rise in a short time.

[0007] The technical solution to achieve the objective of this invention is as follows: A method for no-load testing of a coal mining machine gearbox is provided, comprising:

[0008] The test bench body has a speed reducer placed on it, and one shaft of the speed reducer is located at the connection point of the mechanical connection system.

[0009] The mechanical connection system and control system are installed on the test bench body. The mechanical connection system is connected to one shaft of the reducer. The control system is connected to the mechanical connection system. The control system controls the stepless speed regulation of the mechanical connection system. The mechanical connection system drives the reducer to rotate in stages with varying speeds.

[0010] Based on one aspect, in one possible implementation, the mechanical connection system includes a continuously variable transmission system, an output shaft and an input shaft connected to the continuously variable transmission system, an output pulley mounted on the output shaft, and a power unit connected to the input shaft;

[0011] The output pulley is connected to one shaft of the reducer. The power unit drives the output pulley to rotate at different speeds in stages, which in turn drives the reducer to rotate at different speeds in stages.

[0012] In one possible implementation, the control system includes a speed regulation unit and a timing unit, wherein the speed regulation unit adjusts the speed of the reducer in real time based on the time information from the timing unit.

[0013] Based on one aspect, in one possible implementation, the test bench body is equipped with a speed reducer, and the test bench body is divided into one-axis, two-axis, three-axis and four-axis placement areas;

[0014] Open the reducer housing, disassemble shaft 1, shaft 2, shaft 3, and shaft 4, and replace the bearing of shaft 2.

[0015] Based on one aspect, in one possible implementation, after the speed reducer is overhauled, it idles on the test bench for more than one hour, and the speed reducer idle time is divided into four speed-changing idle periods.

[0016] On the other hand, including:

[0017] Connect the mechanical connection system to the first shaft of the reducer after maintenance;

[0018] Start the mechanical connection system, and the first shaft of the reducer gradually accelerates to the first preset value. Then start checking for oil leaks in the reducer.

[0019] The speed reducer was kept running idle for more than one hour until the oil leak test and sealing test were completed.

[0020] Slowly reduce the speed of the mechanical connection system until the reducer shaft stops rotating.

[0021] On another front, in one possible implementation, connecting the mechanical connection system to the shaft of the speed reducer after maintenance includes:

[0022] Connect the output pulley of the mechanical connection system to the pulley of the reducer using a belt.

[0023] Connect the output pulley of the mechanical connection system to the output shaft of the continuously variable transmission system;

[0024] Connect the power unit of the mechanical connection system to the input shaft of the continuously variable transmission system;

[0025] Connect the continuously variable transmission system to the control system.

[0026] On another front, in one possible implementation, the reducer's first shaft gradually accelerates to a first preset value, including:

[0027] The control system controls the start of the continuously variable transmission system, and the continuously variable transmission system controls the first shaft of the reducer to accelerate along the parabola to the first preset value, which is the historical average speed of the first shaft of the reducer.

[0028] Based on the first preset value, monitor the initial sealing condition of the gearbox and the initial oil temperature of the lubricating oil in the gearbox during the linkage process of the first, second, third, and fourth axes.

[0029] On another front, in one possible implementation, the reducer continuously idles for more than one hour until oil leakage and sealing tests are completed, including:

[0030] The control system controls the continuously variable transmission system to run for X time under the condition of a speed difference of a first preset value and a first difference value, monitors the changes in the seal inside the gearbox, and obtains the temperature rise of the lubricating oil inside the gearbox.

[0031] The control system controls the continuously variable transmission system to rise from a first preset value to a second preset value, and operates for a time Y under the condition that the speed difference between the second preset value and the second difference value is large. It monitors the changes in the seal inside the gearbox and obtains the temperature rise of the lubricating oil inside the gearbox.

[0032] The control system controls the continuously variable transmission system to decrease from the second preset value to the third preset value. The third preset value is less than the first preset value. The system runs for Z time under the condition that the speed difference between the third preset value and the third difference is large. The system monitors the changes in the seal inside the gearbox and obtains the temperature rise of the lubricating oil inside the gearbox.

[0033] The control system controls the continuously variable transmission system to rise from the third preset value to the fourth preset value. Under the condition that the speed difference between the fourth preset value and the fourth difference value is large, the system runs for W time, monitors the changes in the seal inside the gearbox, and obtains the temperature rise of the lubricating oil inside the gearbox.

[0034] The control system controls the continuously variable transmission system to run for Q time under the following conditions: the speed decreases from the fourth preset value to the fifth preset value; the fifth preset value is close to the first preset value; the fifth preset value is greater than the third preset value; and the fifth preset value is significantly different from the fifth difference speed. The system also monitors the changes in the seal inside the gearbox and obtains the temperature rise of the lubricating oil inside the gearbox.

[0035] On another front, in one possible implementation, the slow reduction of the rotational speed of the mechanical connection system includes:

[0036] The control system controls the continuously variable transmission system from the fifth preset value along a downward parabola until it becomes 0, and collects the sealing test data during the process of the fifth preset value decreasing to 0.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] This invention uses a mechanical connection system to drive the reducer to rotate at different speeds in stages, simulating the high-speed rotation of the coal mining machine's gearbox under different working conditions, which facilitates the detection of the gearbox's sealing condition and lubricating oil temperature rise in a short time. Attached Figure Description

[0039] Figure 1 A schematic diagram of the principle of a no-load test method for a coal mining machine gearbox provided by the present invention;

[0040] Figure 2 A flowchart of a no-load test method for a coal mining machine gearbox is provided by the present invention.

[0041] Figure 3 Schematic diagram of the transmission stages of the continuously variable transmission system provided by the present invention Figure 1 ;

[0042] Figure 4 Schematic diagram of the transmission stages of the continuously variable transmission system provided by the present invention Figure 2 ;

[0043] In the diagram, a - the reducer shaft gradually accelerates to the first preset value; b - the reducer continuously idles for more than one hour; b1 - the idle amplitude variation curve at the first preset value stage; b2 - the idle amplitude variation curve at the second preset value stage; b3 - the idle amplitude variation curve at the third preset value stage; b4 - the idle amplitude variation curve at the fourth preset value stage; b5 - the idle amplitude variation curve at the fifth preset value stage; c - reducing the speed of the mechanical connection system until the reducer shaft stops rotating; s1 - the first preset value; s2 - the second preset value; s3 - the third preset value; s4 - the fourth preset value; s5 - the fifth preset value; l1 - the first difference; l2 - the second difference; l3 - the third difference; l4 - the fourth difference; l5 - the fifth difference. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0045] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0046] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0048] Please see Figure 1 This invention provides a method for no-load testing of a coal mining machine gearbox, including a test bench body and a mechanical connection system and a control system installed on the test bench body. A gearbox is placed on the test bench body, and one shaft of the gearbox is located at the connection point of the mechanical connection system. The mechanical connection system is connected to one shaft of the gearbox, and the control system is connected to the mechanical connection system. The control system controls the mechanical connection system to infinitely adjust the speed, and the mechanical connection system drives the gearbox to rotate at different speeds in stages.

[0049] Based on the above scheme, the preferred mechanical connection system includes a continuously variable transmission system, an output shaft and an input shaft connected to the continuously variable transmission system, an output pulley mounted on the output shaft, and a power unit connected to the input shaft; the output pulley is connected to one shaft of the reducer, and the power unit drives the output pulley to rotate in stages with varying speeds, thereby driving the reducer to rotate in stages with varying speeds.

[0050] The continuously variable transmission (CVT) system of this invention includes basic components such as a driving pulley set, a driven pulley set, a metal belt, and a hydraulic pump. The metal belt consists of two bundles of metal rings and hundreds of metal plates. Both the driving and driven pulley sets are composed of a movable disc and a fixed disc. The pulley on the side closest to the hydraulic cylinder can slide on the shaft, while the other side is fixed. Both the movable and fixed discs have conical structures, and their conical surfaces form V-grooves to engage with the V-shaped metal transmission belt. The power output from the output shaft is first transmitted to the driving pulley of the CVT, and then transmitted to the driven pulley via the V-shaped transmission belt.

[0051] The continuously variable transmission (CVT) system of this invention refers to a transmission system that can continuously obtain any transmission ratio within its transmission range. In practical applications, the CVT systems of this invention fall into three categories: First, the electromagnetic slip type, which uses an electromagnetic slip clutch installed in an asynchronous motor to adjust speed by changing its excitation current. This is a relatively outdated speed control method. Its advantages include simple structure, low cost, and convenient operation and maintenance; however, it suffers from large slippage, low efficiency, and significant heat generation, making it unsuitable for long-term load operation and generally only used for low-power transmissions. Second, the DC motor type, which achieves speed control by changing the magnetic flux or armature voltage. Its advantages include a large speed range and high accuracy, but the equipment is complex, costly, and difficult to maintain. It is generally used in medium-power ranges (tens to hundreds of kilowatts) and is gradually being replaced by AC motor types. Third, the AC motor type, which adjusts speed through pole changing, voltage regulation, and frequency conversion. The most common practical application is frequency conversion speed control, which uses an amplitude converter to obtain variable power and then drives the motor to change speed. Its characteristics include good speed regulation performance, wide range, high efficiency, automatic control, small size, and wide applicable power range. However, its mechanical characteristics are constant torque in the speed reduction range, low efficiency and unstable operation at low speeds, high price, and the need for professional maintenance. In recent years, frequency converters have developed rapidly as an advanced and excellent speed change device, which has had a certain impact on mechanical continuously variable transmission systems. A preferred CVT mechanism has a sector gear mounted on an adjustable gear hub, located on the outer circumference of the synchronous gear, via a connecting shaft. The gears on the sector gear mesh with the gears on the outer circumference of the synchronous gear. The outer side of the sector gear is fixed to one end of the rack, thus forming an adjustable gear. When the adjustable gear rotates around the bending direction of the rack to drive the internal gear ring, the distance between the gear shaft and the internal gear ring shaft is adjusted by a servo mechanism, thereby changing the number of teeth of the internal gear ring acting between two adjacent racks, changing the transmission ratio, and thus achieving continuously variable speed. In practical applications, the new continuously variable transmission system of this invention installs a transmission component called a multi-plate chain belt on the basis of the original continuously variable transmission system. This component greatly expands the application range of the continuously variable transmission system and can transmit and control power output with a peak value of up to 280 N·m. Its transmission ratio exceeds the limit value of various previous automatic transmission systems.

[0052] Based on the above scheme, the preferred control system includes a speed regulation unit and a timing unit, and the speed regulation unit adjusts the speed of the reducer in real time according to the time information of the timing unit.

[0053] The speed control unit of this invention, based on the proportional relationship between motor speed and the input frequency of the power supply, achieves the purpose of changing the motor speed by altering the frequency of the power supply. The main component of the speed control unit is a frequency converter that provides the variable frequency power supply. Frequency converters can be divided into two main categories: AC-DC-AC frequency converters and AC-AC frequency converters, with AC-DC-AC frequency converters being preferred. Using a frequency converter to change the power supply frequency for speed control offers a wide speed range, good stability and smoothness, and relatively stiff mechanical characteristics. Even with rated load, the speed drop is minimal, constituting stepless speed control.

[0054] This invention's timing unit microcontroller requires various clock and clock source selections, as well as power control and low-power mode wake-up. Its functions include: oscillator; clock source selection; clock divider; power control; wake-up timer; and external clock output. All registers (regardless of size) are arranged according to word address boundaries. Detailed register contents are given in each function description. The microcontroller includes three independent oscillators: a master oscillator, an internal RC oscillator, and an RTC oscillator. Each oscillator can be selected according to specific application requirements. After reset, the microcontroller automatically selects the internal RC oscillator as the system clock source. The user can modify the clock source selection register via software. This allows the system to operate without an external crystal and allows operation at a known frequency. The internal RC oscillator can be used as a clock source for the watchdog timer, as well as for driving the PLLO and CPU. The accuracy of the IRC does not meet the time base accuracy requirements of the USB interface, and if the CAN baud rate is higher than 100 kbit / s, the IRC should not be applied to the CAN1 / 2 block. The rated frequency of the IRC is 4 MHz. The master oscillator (external crystal oscillator) can serve as the CPU's clock source (regardless of whether a PLLO is used). The master oscillator operates between 1MHz and 24MHz, a frequency that can be increased by the master PLL (PLLO) up to the maximum value of the CPU's operating frequency. The oscillator output is called OSC_CLK. PLLCLKIN is selected as the PLLO input clock. For ease of writing the frequency equation and for the description in this document, the ARM processor clock frequency is referred to as CCLK. PLLCLKIN and CCLK have the same frequency unless the PLLO is active and connected. The microcontroller oscillator can operate in two modes: slave mode and oscillation mode. In slave mode, the input clock signal should be connected to a 100pF capacitor with an amplitude of at least 200mVrms. The XTAL2 pin does not need to be connected in this configuration. For oscillation mode, since the feedback resistor is integrated on-chip, only a crystal and capacitors Cx1 and Cx2 need to be connected externally to form the basic oscillation circuit. Capacitor Cp is a parallel packaged capacitor with a value not exceeding 7pF.

[0055] Based on the above scheme, it is preferred that the test bench body is equipped with a speed reducer, and the test bench body is divided into areas for placing the first shaft, second shaft, third shaft and fourth shaft; open the speed reducer housing to disassemble the first shaft, second shaft, third shaft and fourth shaft and replace the second shaft bearing.

[0056] In practical use, it is preferable to inspect and repair the coal mining machine's gearbox on the surface. The inspection involves opening the gearbox, disassembling shafts one, two, three, and four, replacing the bearing on shaft two, cleaning the gearbox, and then reinstalling it. After installation, to ensure the gearbox's integrity, a surface test run is conducted. A motor drives shaft one, a counterweight base is machined, and the motor is bolted to the base. A machined pulley is fitted onto shaft one, and the shaft pulley is connected to the motor pulley with a belt. After connection, power is supplied for a test run of at least one hour. If the gearbox shows no oil leakage or abnormal noise, the gearbox inspection and test run is considered successful. This ability to conduct a surface test run after gearbox inspection allows for timely identification and resolution of problems, preventing unusable equipment from having to be brought back to the surface after being brought underground. This effectively ensures timely installation and use of the equipment after it enters the mine, guaranteeing normal mine production.

[0057] The coal mining machine of this invention comprises: 1. Cutting section: consisting of left and right drums, left and right rocker arms, left and right cutting motors, and internal and external spray cooling systems; this mechanism is responsible for cutting and loading coal. 2. Traction section: consisting of left and right traction reduction gearboxes, left and right travel gearboxes, left and right traction motors, slipper assemblies, and a cooling system for the traction motors; this mechanism is the actuator for machine movement. 3. Intermediate frame: consisting of a frame, oil pump motor, hydraulic oil tank, height adjustment valve group, junction box, frequency converter, frequency converter transformer, electrical control box, water valve, and cable-stayed assembly; this part is the core of the machine's control and protection devices. 4. Operating system: The coal mining machine has three operating systems (intermediate manual operation, two-end electric button operation, and wireless off-machine operation). The reducer transmits power from one shaft to the other through the rotation of a pair of meshing gears mounted in the housing, thereby achieving speed reduction. (Generally, power is transmitted from the electric motor to the gear shaft via belt drive or coupling, and then to the driven shaft through two meshing gears to achieve speed reduction.) The spline of the traction motor output shaft is connected to the gear of the first shaft, which transmits the motor's output torque to the planetary reducer through the gears of the first shaft, the second shaft, the third shaft, and the large gear. After planetary reduction, the torque is output from the planetary carrier and transmitted to the drive wheel in the traveling gearbox. The drive wheel meshes with the traveling wheel, and then the traveling wheel meshes with the pin rail on the scraper conveyor of the working face, enabling the coal mining machine to move.

[0058] Based on the above scheme, it is preferable to allow the reducer to idle for more than one hour after maintenance, with the reducer idling time divided into four speed-changing idling periods.

[0059] Please see Figure 2This invention provides a method for no-load testing of a coal mining machine gearbox, comprising: connecting a mechanical connection system to the first shaft of a gearbox after maintenance; starting the mechanical connection system, gradually accelerating the first shaft of the gearbox to a first preset value, and starting to detect whether the gearbox has oil leakage; the gearbox continuously idles for more than one hour until the oil leakage detection and sealing test are completed; and slowly reducing the speed of the mechanical connection system until the first shaft of the gearbox stops rotating.

[0060] Based on the above scheme, it is preferable to connect the mechanical connection system to the first shaft of the reducer after maintenance, including: connecting the output pulley of the mechanical connection system to the first shaft pulley of the reducer with a belt; connecting the output pulley of the mechanical connection system to the output shaft of the continuously variable transmission system; connecting the power unit of the mechanical connection system to the input shaft of the continuously variable transmission system; and connecting the continuously variable transmission system to the control system.

[0061] Based on the above solution, please refer to Figure 3 and Figure 4 The preferred method is to gradually accelerate the first shaft of the reducer to a first preset value, including: the control system controls the start of the continuously variable transmission system, the continuously variable transmission system controls the first shaft of the reducer to accelerate along an upward parabola to the first preset value, the first preset value being the historical average speed of the first shaft of the reducer; and based on the first preset value, monitoring the initial sealing condition of the reducer housing and the initial oil temperature of the lubricating oil in the reducer housing during the linkage process of the first, second, third, and fourth shafts.

[0062] Based on the above solutions, please continue to refer to... Figure 3 and Figure 4The preferred method is to continuously idle the gearbox for more than one hour until oil leakage and sealing tests are completed, including: the control system controlling the continuously variable transmission (CVT) to run for X time under a speed condition where the speed difference between the first preset value and the first difference value is large, monitoring the sealing changes inside the gearbox and obtaining the temperature rise of the lubricating oil inside the gearbox; the control system controlling the CVT to rise from the first preset value to the second preset value, and running for Y time under a speed condition where the speed difference between the second preset value and the second difference value is large, monitoring the sealing changes inside the gearbox and obtaining the temperature rise of the lubricating oil inside the gearbox; the control system controlling the CVT to fall from the second preset value to the third preset value, where the third preset value is less than the first preset value, and the speed difference between the third preset value and the second difference value is large. The system operates for time Z under the third differential speed condition, monitoring the seal changes inside the gearbox and obtaining the temperature rise of the lubricating oil inside the gearbox. The control system controls the continuously variable transmission system to rise from the third preset value to the fourth preset value. Under the fourth preset value, which is significantly different from the fourth differential speed condition, the system operates for time W, monitoring the seal changes inside the gearbox and obtaining the temperature rise of the lubricating oil inside the gearbox. The control system controls the continuously variable transmission system to fall from the fourth preset value to the fifth preset value. Under the fifth preset value, which is close to the first preset value, greater than the third preset value, and significantly different from the fifth differential speed condition, the system operates for time Q, monitoring the seal changes inside the gearbox and obtaining the temperature rise of the lubricating oil inside the gearbox.

[0063] Based on the above solutions, please continue to refer to... Figure 3 and Figure 4 The preferred method is to slowly reduce the speed of the mechanical connection system, including: the control system controlling the continuously variable transmission system from the fifth preset value along the downward parabola until it becomes 0, and collecting the sealing test data during the process of the fifth preset value decreasing to 0.

[0064] The embodiments of the present invention employ a mechanical connection system to drive the reducer to rotate at different speeds in stages, simulating the high-speed rotation of the coal mining machine's gearbox under different working conditions, which facilitates the detection of the gearbox's sealing condition and lubricating oil temperature rise in a short time.

[0065] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method of conducting a no-load test of a shearer gearbox, characterised by, The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test bench body and connected with the shaft of the reducer, and a control system connected with the mechanical connection system. The utility model relates to a test bench for simulating the high-speed rotation of a reducer under different working conditions, which comprises a test bench body, a reducer mounted on the test bench body, a mechanical connection system mounted on the test The control system controls the continuously variable transmission system to decrease from the fourth preset value to a fifth preset value, the fifth preset value is close to the first preset value, the fifth preset value is greater than the third preset value, the fifth preset value is operated under a fifth difference speed for Q time, the change of the seal in the gearbox is monitored, and the temperature rise of the lubricating oil in the gearbox is obtained; The speed of the mechanical connection system is slowly reduced until the shaft of the gearbox stops rotating; The speed of the mechanical connection system is slowly reduced, comprising: The control system controls the continuously variable transmission system to decrease from the fifth preset value along a downward parabola until it becomes 0.

2. The method of claim 1, wherein, The mechanical connection system is connected with the shaft of the gearbox after the maintenance is completed, comprising: The output pulley of the mechanical connection system is connected with the pulley of the shaft of the gearbox by a belt; The output pulley of the mechanical connection system is connected with the output shaft of the continuously variable transmission system; The power device of the mechanical connection system is connected with the input shaft of the continuously variable transmission system; The continuously variable transmission system is connected with the control system.

3. The coal cutter reduction gearbox no-load testing method according to claim 1, characterized in that, According to the first preset value, the initial condition of the seal in the gearbox and the initial oil temperature of the lubricating oil in the gearbox during the linkage of the shafts are monitored.

4. The method of claim 1, wherein, Sealing detection data during the process of decreasing the fifth preset value to 0 is collected.

5. The coal cutter reduction gearbox no-load testing method according to claim 1, characterized in that, The control system comprises a speed regulation unit and a timing unit, and the speed regulation unit adjusts the speed of the gearbox in real time according to the time information of the timing unit.

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