High-precision intelligentized rail fastener bolt wrench and operating method thereof

Abstract

The invention provides a high-precision intelligentized rail fastener bolt wrench and an operating method of the high-precision intelligentized rail fastener bolt wrench. A power system is arranged on a vehicle frame and transports driving power to a hydraulic motor through an oil pump and a control valve component. The vehicle frame is further provided with a working system, and the working system comprises two groups of working devices which are vertically arranged. Each group of working devices comprise a bolt sleeve and a hydraulic motor which drives the bolt sleeves to rotate, and the bolt sleeves are connected in a coaxial mode. A torque sensor is arranged between the bolt sleeve and the hydraulic motor in series, the torque sensor is connected with a torque measurement and control instrument, and the torque sensor transmits a torque state to the torque measurement, controls instrument and further controls a torque output state of the hydraulic motor. When screwing operation is conducted and the torque sensor detects an instant torque value which is identical with the set torque value, the hydraulic motor stops screwing. When the screwing operation is conducted and an existing bolt torque exceeds the set value, the working device reversely unscrews and unloads the bolt, then screws the bolt and sets a value. The high-precision intelligentized rail fastener bolt wrench is simple and reliable in structure, and two groups of working devices independently work and do not influence each other.

Description

technical field [0001] The invention relates to a device and method for railway track laying and maintenance, in particular to a high-precision intelligent track fastener bolt wrench and its operating method for tightening and loosening the fastener bolts of passenger dedicated lines and high-speed railways. Background technique [0002] The tightening and loosening of track fastener bolts is an indispensable work in railway track laying, existing line overhaul and maintenance and repair operations. It requires a large number of applicable special machines to replace heavy manual labor. The rail fasteners regularly maintain accurate buckling pressure, keep the buckling pressure of the fasteners on the left and right sides of the rail balanced, and ultimately ensure the driving safety of the railway line. [0003] At present, the track fastener bolt wrench equipment used at the railway construction site mainly includes the following types: [0004] 1. Single head mechanical...

AI Technical Summary

Problems solved by technology

The main shortcomings of the wrench with this structure are: (1) It is difficult to accurately control the tightening torque of the sleeve, and the operator cannot know the change of the working torque of the sleeve; (2) The tightening torque cannot be accurately adjusted after the impact sleeve is worn; ( 3) The fastener bolts on the left and right sides of the rail can only be tightened sequentially, and the fastening pressure of the bolt fasteners is unbalanced, resulting in partial load on both sides of the rail; (4) The impact force of the bolt sleeve damages the nut seriously; (5) When the left and right fasteners of the rail are operated in sequence, the rear body needs to be lifted to cross the rail, which increases the labor intensity of the operator

However, there are still obvious deficiencies in this wrench structure: (1) It is difficult to accurately control the tightening torque of the sleeve, and the operator cannot know the change of the working torque of the sleeve; (2) The tightening torque cannot be adjusted accurately after the impact sleeve is worn; (3) Since the center distance of the left and right impact sleeves is fixed, it can only be applied to the same type of rail fastener operation

However, this hydraulic torque wrench also has some obvious shortcomings: (1) The stability of the working torque is poor, because the working pressure of the motor is used to convert the torque value, and the output torque of the motor is not only determined by the working pressure, but also affected by the mechanical efficiency of the motor , when the oil temperature of the hydraulic system rises, the mechanical efficiency of the motor will change significantly, and the opening characteristics of the pressure control valve of the hydraulic circuit will also change, resulting in a change in the conversion relationship between the working pressure and torque determined at normal temperature. That is, all the bolt wrenches that stop working with the set working pressure of the hydraulic motor as the bolt sleeve have the main reason for the poor stability of the torque value; (2) Because it is a single-head wrench, the fastener bolts on the left and right sides of the rail Can not be tightened at the same time, the buckle pressure of the fastener is unbalanced, causing the two sides of the rail to be subjected to partial load force, affecting the precise positioning of the rail; (3) When the left and right fasteners of the rail are operated in sequence, the rear fuselage needs to be lifted to span the rail, increasing operator's labor intensity

In addition to the same disadvantage of "poor working torque stability" as the single-head hydraulic torque wrench, there are also the following disadvantages: (1) Since the output shaft is a fixed center distance, it is only suitable for the same type of rail fastener operation. Due to the deviation of the center distance of the bolts, only the "universal joint" type bolt sleeve can be used, and the sleeve is often working in an inclined state, which reduces the accuracy of the tightening torque; (2) due to the use of a motor through the transfer gearbox Drive two bolt sleeves to work at the same time, and the two bolt sleeves can only rotate synchronously, so the fastener bolts on both sides of the rail cannot reach a suitable tightening state at the same time, commonly known as "false double-headed".

[0016] (1) The working torque accuracy of the bolt sleeve is not high (only 7-10%) or unstable;

[0017] (2) The bolt sleeves on the left and right sides cannot be tightened at the same time;

[0018] (3) The center distance of the socket of the double-ended wrench is fixed, which cannot meet the needs of different types of fasteners;

[0019] (4) The working torque value of the bolt sleeve either has no indication method or is inaccurate, which is not convenient for the operator to monitor or check;

[0020] (5) The mechanism is too complicated and inconvenient to operate

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