| The sliding spiral pair is widely used in the field of mechanical transmission due to its simple structure,low manufacturing cost,and large bearing capacity.However,in the molding equipment under heavy load conditions,due to the increased frictional resistance of the spiral contact surface,the wear is increased,resulting in a decrease in mechanical efficiency and increased energy consumption.In order to solve the above problems,a new sliding spiral pair(hereinafter referred to as a new sliding spiral pair)composed of a steel back / carbon fabric self-lubricating composite lining nut has been proposed and studied by the project team.The early results show that it has good working performance.Based on the performance of the sliding spiral pair,it will directly affect the overall accuracy,stability and service life.Therefore,the accurate measurement of the performance of the new sliding spiral pair is of great significance to all the molding equipment that uses the sliding spiral pair.Based on this,a new type of sliding spiral pair performance test platform(hereinafter referred to as the test platform)was developed,and related experimental tests were carried out on the new sliding spiral pair.This subject mainly carried out the following development and research work:(1)Carried out the overall plan design research of the test platform.Through the analysis of the performance requirements of the new sliding spiral pair,the test items are clarified,and the test methods are formulated according to the test items.As the same time,the platform technical requirements and overall design principles are determined,and eventually the overall scheme design of each module is carried out according to the system principle scheme.(2)Carried out the construction of the test platform mechanical system.The test platform adopts the form of hydraulic cylinder loading to realize the simulated loading of the sliding spiral pair.According to the loading form and layout requirements of the platform,complete the design,modeling,processing and assembly of the mechanical structure.(3)Carried out the design and development of the test platform hardware and software.The test platform as a whole adopts the control scheme of "industrial control computer + motion control card + PLC",and the components are selected according to the control scheme,and the circuits are connected to complete the development of the hardware platform.The test platform software is composed of two parts: upper computer and lower computer.The upper computer software program is divided into five main modules: user authority module,data communication module,motion control system,data acquisition system,and hydraulic loading system.The software program of the lower computer specifically includes: a motion control program,a D/A parameter setting program,and an A/D data acquisition program.(4)The performance test experiment of sliding spiral pair was carried out.Firstly,a verification experiment of system stability and accuracy was carried out,and the back pressure,loading force,theoretical driving torque,actual driving torque and other parameters of the traditional bronze sliding spiral pair under 0N-25000 N were measured.The experimental results show that the accuracy of the loading force of the system reaches 98.85%,and the accuracy of the driving torque reaches 98.4%.Secondly,for the performance test of the new sliding spiral pair,the "wrapping-injection" method was used to complete the preparation of the new sliding spiral pair.Next,the performance comparison test was carried out on the new sliding spiral pair and the bronze sliding spiral pair.The experimental results show that under low-speed and heavy-load conditions,the driving torque of the new sliding spiral pair is reduced by 12%,the friction coefficient is reduced by 24.4%,and the mechanical efficiency is increased by 12.8%.The research results show that: 1)The test platform can complete the performance test of the sliding spiral pair under low-speed and heavy-load conditions,and the platform runs stably and has relatively complete functions to meet the basic test requirements.2)The test further proves that compared with the traditional bronze sliding spiral pair,the new sliding spiral pair has the advantages of low friction coefficient,high mechanical efficiency,small energy loss,and high transmission stability. |
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