Aiming at the problems of strong vibration of the whole machine and cracking of the frame, etc, by using ANSYS Workbench19.0 software, the statics and constrained modal analysis of the frame of the residual film recycling machine are carried out, the static and modal characteristics of the frame are studied, and the natural frequency, vibration mode, damping and other parameters of the frame are obtained, on this basis, the thickness of the left and right side plates of the frame, the thickness of the main connecting beam tube and the width of the auxiliary supporting beam are taken as the experimental factors by adopting the orthogonal experimental design method, the natural frequencies of the first and second order are used to optimize the structure. When the thickness of the left and right side plate of the frame is 12 mm, the thickness of the main connecting beam tube is 6 mm, and the width of the auxiliary supporting beam is 70 mm, the natural frequencies of the first and second order of the frame are 50.747 Hz and 53.557 Hz, which are not in the range of 0.833-40 Hz of the external excitation frequency, the maximum stress value after optimization is reduced by 3.295 MPa, and the maximum amplitude of 17.642 mm before optimization is reduced by 4.923 mm compared with the maximum amplitude of 12.719 mm after optimization, the frame before and after optimization meets the requirements of stiffness and strength. This study can provide theoretical reference for the design and reliability research of the frame of residual film recovery machine.

Aiming at the problems of poor reliability, low film pickup rate and high wrapping rate of the traditional telescopic pole tine type film pickup device, a guided telescopic film pickup device was designed based on the centered directaction roller cam. The key components of the pickup device were designed according to the working requirements of film picking, and the main structural parameters of the cam guide disc, pickup drum and spring tooth shaft assembly in the film pickup device were determined. In order to verify the operational performance of the pickup device, orthogonal tests were conducted with the machine advancing velocity, the speed of the film pickup roller, and the depth of the teeth into the soil as the test factors, and the film pickup rate and film wrapping rate as the test indexes. The test results showed that the primary and secondary factors affecting the film pickup rate and wrapping rates were the speed of the film pickup roller, the depth of the bullet teeth into the soil and the machine advancing velocity. The optimal operating parameters were the speed of the film pickup roller by 55 r/min, the depth of the bullet teeth into the soil by 40 mm and the machine advancing velocity by 4 km/h. The results showed that the film pickup rate was 88.87% and the film wrapping rate was 1.51%, which satisfied the requirements of the residual film recovery operation. The research results can provide reference for the structural design and optimization of the guided telescopic film pickup device.

In order to monitor the double chain drive synchronicity of the chain rake picking up mechanism, a double chain drive synchronicity monitoring system based on eddy current sensor was designed. The monitoring system takes STC89C52 MCU hardware system as the lower machine and obtains the speed information of the chain raking mechanism and the power shaft through the eddy current sensor and Hall sensor, respectively. The system determines the running state of the chain raking mechanism of the film receiving machine. It transmits the state information to the human-machine interface of SG121-BGCM industrial computer for real-time display through the HC-12 wireless module.The laboratory test shows that when the speed of the film collecting chain harrow is 168 r/min, the accuracy rate of the jumping gear monitoring of the chain picking mechanism is more than 96%.The field experiment shows that the accuracy rate of the jump gear monitoring is more than 95% when the forward speed of the film collector is 8 km/h, and the speed of the chain harrow picking mechanism is 168 r/min. The monitoring system realizes the real-time and high precision monitoring of the running state of the chain-rake type residual film recovery machine, which is helpful to improve the operation reliability of the residual film recovery machine.