A nesting replacement system for a speed measuring machine

Abstract

The present invention discloses a nested replacement system for a tachometer, which is mainly used in a mine hoisting system, and includes a remote control terminal and a tachometer debugging device. The remote control terminal is installed in a remote control dispatch room, and controls the operation of large motors in the hoisting system, and includes a display device and a PLC control module, wherein a numerical input dialog box is provided on the display interface of the display device; a nested program and a benchmark numerical simulation library are provided in the PLC control module, and the nested program contains numerical parameter conversion calculation formulas before and after the replacement of the old and new tachometers. The tachometer debugging device is arranged on one side of the drum where the tachometer is installed, and includes a supporting base, a lifting screw and a stabilizing support. The present invention effectively solves the problem that the speed measuring system cannot handle serious faults or the debugging process is complicated, greatly reduces the system failure time, reduces the impact on the entire hoisting system, and at the same time reduces the workload and improves the safety of workers and the system.

Description

Technical Field

[0001] The invention relates to the technical field of mine hoisting systems, and in particular to a nesting replacement system for a tachometer. Background Art

[0002] In the process of coal mining, production and transportation, the mine hoisting system is an indispensable part, and for the hoisting system, "speed" is a crucial parameter. When the speed produces errors and fluctuates, the entire system is in a dangerous state. The main reason is that there is a problem with the speed feedback system. Due to long-term operation, the speed control in the system will cause the carbon brushes and the generator coils to be continuously worn out due to friction. At the same time, under the strong magnetic field of the main system, the magnetism of this permanent magnet generator will continue to decrease, which will cause the stubborn faults that we often see, "nothing happens during the day, something happens at night". Although it will be temporarily stable after the power outage reset, new strange phenomena will still appear. In order to solve the fault problem in the speed measuring system, it is usually necessary to remove the old speed measuring machine, install a new one, and then slowly increase the speed from 0. Every time a speed is reached, the coefficient in the control system needs to be corrected, and so on. Slowly accelerate and debug until the rated speed of the winch is reached. Since this process is extremely cumbersome, it is impossible for general maintenance personnel to complete it except for the manufacturer's debugging personnel. This causes the system to be in a long-term fault state after the problem occurs, and it cannot be improved normally, affecting work efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide a nesting replacement system for a tachometer.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a nested replacement system for a tachometer, including a remote control terminal and a tachometer debugging device, wherein the remote control terminal is connected to control the operation of a large motor in a lifting system, the large motor drives the drum to rotate, and a tachometer is installed at the other end of the drum shaft. The remote control terminal includes a display device and a PLC control module, wherein a nested program and a benchmark numerical simulation library are provided in the PLC control module, and a numerical parameter conversion calculation formula before and after the replacement of the old and new tachometers is written in the nested program; a numerical input dialog box is provided on the display interface of the display device.

[0005] The speed measuring machine debugging device is arranged on one side of the roller mounted speed measuring machine, and includes a supporting base, a lifting screw and a stabilizing support. The nut in the lifting screw is fixedly installed at the center of the upper top plate of the supporting base. The screw in the lifting screw cooperates with the nut and passes through the upper top plate of the supporting base. The top end of the screw is fixedly connected to the bottom center of the stabilizing support, and a vertical flange is provided at one end of the stabilizing support.

[0006] Furthermore, the calculation formula written in the nested program is: coefficient × benchmark value = output value in the PLC control module corresponding to the new tachometer; wherein, coefficient = parameter filled in real time in the numerical input dialog box ÷ voltage parameter corresponding to the benchmark numerical simulation library, and the parameter filled in the numerical input dialog box is the voltage value corresponding to the new tachometer after replacement.

[0007] Furthermore, the voltage value corresponding to the new tachometer is the voltage generated when the new tachometer reaches the maximum speed of 8.8 m / s.

[0008] Furthermore, the voltage parameter corresponding to the benchmark numerical simulation library is 90V, and the benchmark values ​​in the benchmark numerical simulation library are the various index parameters corresponding to the 90V tachometer when the tachometer reaches the maximum speed of 8.8m / s.

[0009] Furthermore, the stable support has an arc-shaped structure, and a vertical flange plate arranged thereon is provided with multiple fixing screw holes; the new tachometer to be replaced is placed on the stable support and fixed to the vertical flange plate by screws, and its output end is connected to the old tachometer to be replaced by an intermediate rotating shaft, so that the new tachometer reaches a synchronous speed with the old tachometer.

[0010] Furthermore, a sensor is provided on the speed measuring machine installed on the drum shaft, which is connected to the PLC control module through a signal, and the speed of the drum driven by the large motor is fed back to the PLC control module in real time. The PLC control module increases or decreases the speed of the large motor according to the feedback speed information to always maintain the speed at 8.8m / s.

[0011] Compared with the prior art, the present invention has the following beneficial effects: the present invention effectively solves the problem that the speed measurement system cannot handle serious faults or the debugging process is complicated, greatly shortens the system failure time, reduces the impact on the entire lifting system, and at the same time reduces the workload and improves the safety of workers and the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the speed measuring machine debugging device in the present invention;

[0013] In the figure: 1. Support base, 2. Lifting screw, 3. Stable support, 4. Vertical flange, 5. New tachometer, 6. Old tachometer, 7. Intermediate rotating shaft. DETAILED DESCRIPTION

[0014] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are relational words determined only for the convenience of describing the structural relationships of the various components of the present invention. They do not specifically mean that any component in the present invention must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as a limitation on the present invention.

[0015] In addition, in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0017] A nested replacement system for a tachometer is mainly used in a mine hoisting system to facilitate the replacement and debugging of the tachometer, and includes a remote control terminal and a tachometer debugging device. The tachometer is installed at the end of the rotating shaft of the drum in the hoisting system, and is used to monitor the rotation speed of the drum in the entire hoisting system in real time, control it to run at a fixed speed, and ensure the stable operation of the entire hoisting system.

[0018] The remote control terminal adopts a computer device, which is installed in the remote control dispatch room to control the operation of the large motor in the lifting system. The large motor drives the drum to rotate through the rotating shaft, and the rotation of the drum drives the rope installed on the outside to rotate to complete the lifting task. The computer control terminal includes a display device and a PLC control module. The display interface of the display device is provided with a numerical input dialog box; the PLC control module is provided with a nested program and a benchmark numerical simulation library, wherein the benchmark numerical parameters in the benchmark numerical simulation library are the numerical values ​​of the parameters corresponding to the speed measuring machine reaching the highest speed of 8.8m / s and the operating voltage of 90V; the nested program is written by software with the numerical parameter conversion formula before and after the replacement of the new and old speed measuring machines, and the calculation method of the conversion formula is: coefficient × benchmark numerical parameter = output value in the PLC control module corresponding to the new speed measuring machine, wherein the coefficient is obtained by dividing the numerical value entered in the above numerical input dialog box by 90V corresponding to the above benchmark numerical parameter, and the numerical value entered in the numerical input dialog box is the output voltage value corresponding to the new speed measuring machine reaching the highest speed of 8.8m / s after replacement.

[0019] The speed measuring machine debugging device is arranged on one side of the roller where the speed measuring machine is installed. Figure 1As shown, it includes a support base 1, a lifting screw rod 2 and a stable support 3. The support base 1 is formed by welding and fixing three support rods and an upper top plate. The three support rods stand in a triangular shape. The upper top plate is welded and fixed to the upper ends of the three support rods. A through hole is provided at the center of the upper top plate. A nut in the lifting screw rod 2 is welded and fixed on the upper side of the through hole. The screw rod in the lifting screw rod 2 is installed in coordination with the nut and passes through the upper top plate, which facilitates the lifting and lowering of the screw rod; a stable support 3 is welded and fixed to the top of the screw rod in the lifting screw rod 2. The stable support 3 is in an arc-shaped structure, and a vertical flange 4 is welded and fixed to its right end. A plurality of fixing screw holes are provided at the edge of the vertical flange 4.

[0020] When in use, the speed meter in the initial lifting system is operated at 90V voltage to 8.8m / s. Due to long-term speed control, it will be constantly worn out, which may easily lead to the risk of failure, so it is necessary to replace the old speed meter 6. When replacing, first place the speed meter debugging device firmly on the ground, and adjust the lifting screw 2 to lift the stable support 3 to the position facing the old speed meter 6; place the new speed meter 5 to be replaced on the stable support 3, and connect and fix it to the vertical flange 4 through the screw holes, so that the new speed meter 5 and the old speed meter 6 are on the same horizontal plane, and the two are connected by the intermediate shaft 7 so that the new speed meter 5 and the old speed meter 6 can reach the synchronous speed. When the new tachometer 5 reaches the highest speed of 8.8m / s, the operating voltage of the new tachometer 5 is measured, and then the operation of the lifting system is suspended, and the corresponding voltage value of the new tachometer 5 is filled in the value input dialog box of the display interface, and the nested program in the PLC control module starts to calculate, obtains the new output value of each parameter and stores the new output value in the PLC control module. Then, the old tachometer 6 at one end of the drum shaft is removed and replaced with the new tachometer 5, completing the replacement and debugging of the tachometer.

[0021] After the new speed measuring machine 5 is installed, the lifting system is started and the operating speed gradually reaches 8.8m / s. A signal sensor is provided in the new speed measuring machine 5, which can feed back the rotation speed information of the drum to the PLC control module in real time, and the PLC control module controls the operating speed of the large motor according to the feedback information. When the received speed information is greater than 8.8m / s, the PLC control module controls to reduce the speed of the large motor; when the received speed information is less than 8.8m / s, the PLC control module controls to increase the speed of the large motor, so that the drum always runs in a stable state.

[0022] After adopting the above-mentioned tachometer replacement debugging system, the relevant parameters and coefficients can be automatically calculated through a series of system calculations, and the PLC control module modifies the large motor operating parameters to the calculated data parameters to correspond to the numerical parameters of the new tachometer. After operating in this way, according to the general impact time caused by the previous serious fault or debugging process, it can save up to 6 hours a month, which is 72 hours a year. Calculated at 40 hooks of coal per hour and 8 tons per hook, a total of 23,000 tons of coal can be increased, greatly improving work efficiency and production capacity.

[0023] Finally, it should be noted that the description of the above implementation mode is only used to illustrate the technical solution of the present invention, and is not a limitation of the present invention. The present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A nesting replacement system for a tachometer, characterized in that: It includes a remote control terminal and a tachometer debugging device, wherein the remote control terminal is connected to control the operation of a large motor in the lifting system, the large motor drives the drum to rotate, and a tachometer is installed at the other end of the drum shaft; the remote control terminal includes a display device and a PLC control module, wherein a nested program and a benchmark numerical simulation library are provided in the PLC control module, and a numerical parameter conversion calculation formula before and after the replacement of the old and new tachometers is written in the nested program; a numerical input dialog box is provided on the display interface of the display device; The speed measuring machine debugging device is arranged on one side of the roller mounted speed measuring machine, and comprises a supporting base, a lifting screw and a stabilizing support. A nut in the lifting screw is fixedly installed at the center of the upper top plate of the supporting base. The screw in the lifting screw matches with the nut and passes through the upper top plate of the supporting base. The top end of the screw is fixedly connected to the bottom center of the stabilizing support. A vertical flange is provided at one end of the stabilizing support. The vertical flange is provided with a plurality of fixing screw holes. When the old tachometer needs to be replaced, the new tachometer to be replaced is placed on a stable support and fixed to the vertical flange by screws passing through the fixing screw holes. The new tachometer and the old tachometer are on the same horizontal plane and are connected by a transmission through an intermediate rotating shaft so that the new tachometer and the old tachometer can reach a synchronous speed.

2. The nesting replacement system of a tachometer according to claim 1, characterized in that: The numerical parameter conversion calculation formula written in the nested program is: coefficient × reference value = output value in the PLC control module corresponding to the new speed measuring machine; Among them, coefficient = parameter filled in real time in the numerical input dialog box ÷ voltage parameter corresponding to the benchmark numerical simulation library. The parameter filled in the numerical input dialog box is the voltage value corresponding to the new tachometer after replacement.

3. The nesting replacement system of a tachometer according to claim 2, characterized in that: The voltage value corresponding to the new tachometer is the voltage generated when the new tachometer reaches the maximum speed of 8.8m / s.

4. The nesting replacement system of a tachometer according to claim 3, characterized in that: The voltage parameter corresponding to the benchmark numerical simulation library is 90V. The benchmark values ​​in the benchmark numerical simulation library are the corresponding index parameters when the tachometer reaches the maximum speed of 8.8m / s and the operating voltage is 90V.

5. The nesting replacement system of a tachometer according to claim 1, characterized in that: The stable support is in an arc-shaped structure.

6. The nesting replacement system of a tachometer according to claim 1, characterized in that: A sensor is installed on the speed measuring machine installed on the drum shaft, which is connected to the PLC control module through a signal. The speed of the drum driven by the large motor is fed back to the PLC control module in real time. The PLC control module increases or decreases the speed of the large motor according to the feedback speed information to always maintain the speed at 8.8m / s.

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