Study on the Digital Hydraulic Driving System of the Belt Conveyor
Round 1
Reviewer 1 Report
This paper presents a hydraulic system scheme which uses digital valve instead of proportional valve and servo valve to control the belt conveyor propulsion system.
Missing author3: All authors' full first and last names must be provided.
The Introduction should be expanded and reflect current international research on the topic of the article.
Citation: In the text, reference numbers should be placed in square brackets [ ], and placed before the punctuation; for example [1], [1–3] or [1,3].
Figure 2. Rotate the picture, the captions of the picture are not visible.
In Chapter 2, the notations of Figures 3, 4, 5 in the text should be the same e.g. (27, 28)
All Figures, Schemes and Tables should be inserted into the main text close to their first citation (eg. Table 1.) Please check this issue elsewhere in the article.
Check the captioning of images, Figure 1, 2 - Fig. 3-
The results are merely described and are limited to comparing the experimental observation. The authors are encouraged to include more detailed discussion section and critically discuss the observations from this investigation with existing literature.
Incomplete reference [25]. Please consider reviewing the style of References.
Plagiarism are found in 3.2 in the text without citation on pages 9 and 10. Please check this issue!
Please check the paper for English editing and typos.
In general, the article makes a good impression, is devoted to an interesting and topical problem of hydraulic systems.
Author Response
Thank you very much for your valuable comments and suggestions which would be of great help to improve quality of our manuscript. I have modified the manuscript accordingly, and the detailed modifications
in the revision are listed below point by point. The questions and comments of the Reviewers are marked in blue, and the responses from the authors are marked in black. The modifications in the revision are marked by a yellow highlight tool.
Ø Responses to Reviewer #1
*1: Missing author3: All authors' full first and last names must be provided.
Responses *1: Thank you very much for your suggestion. I have provided all authors' full first and last names in the revised manuscript.
*2: The Introduction should be expanded and reflect current international research on the topic of the article.
Responses *2: Thank you very much for your suggestion. Following your useful advice, I have modified the paper accordingly and supplemented more information about the research in the revised manuscript.
The detailed reply is as follows: Yamada developed a high-speed on/off digital valve used in a hydraulic control system. The device basically consists of a poppet valve acting as the main valve, and a multilayered piezoelectric (PZT) actuator for driving the poppet valve [22]. Markus explained numerous benefits in comparison to the state of the art analogue technology [23]. Foschum optimized the current signal by multi objective genetic optimization integrating a physical valve in the optimization loop [24].
*3: Citation: In the text, reference numbers should be placed in square brackets [ ], and placed before the punctuation; for example [1], [1–3] or [1,3].
Responses *3: Thank you very much for your suggestion. Following your useful advice, I have modified the paper accordingly in the revised manuscript.
*4: Figure 2. Rotate the picture, the captions of the picture are not visible.
Responses *4: Thank you very much for your suggestion. The captions of the picture are visible in the revised manuscript.
.
*5: In Chapter 2, the notations of Figures 3, 4, 5 in the text should be the same e.g. (27, 28)
Responses *5: Thank you very much for your suggestion. Following your useful advice, I have modified the paper accordingly in the revised manuscript.
*6: All Figures, Schemes and Tables should be inserted into the main text close to their first citation (eg. Table 1.) Please check this issue elsewhere in the article.
Responses *6: Thank you very much for your suggestion. Following your useful advice, I have inserted the schemes and tables into the main text close to their citation accordingly in the revised manuscript.
*7: Check the captioning of images, Figure 1, 2 - Fig. 3-
Responses *7: Thank you very much for your suggestion. Following your useful advice, I have checked the captioning of the images, and adjusted them accordingly in the revised manuscript.
*8: The results are merely described and are limited to comparing the experimental observation. The authors are encouraged to include more detailed discussion section and critically discuss the observations from this investigation with existing literature.
Responses *8: Thank you very much for your suggestion. Following your useful advice, I have added the more detailed discussion section in the revised manuscript.
The detailed reply is as follows: Hydraulic servo system is often used as the power system of belt conveyor, but digital hydraulic system is rarely used. However, digital hydraulic system has its own advantages, such as short commissioning cycle, low cost and high anti pollution performance. By paralleling multiple digital valves, the function of the traditional servo system can be realized. Because there are multiple digital valves in a hydraulic circuit, the system can have a certain degree of safety redundancy and further improve the reliability of the system. Through scheme formulation, component modeling and system simulation, it can be seen that the control performance of digital hydraulic system is good, and the function of traditional servo hydraulic system can be realized in the future technical upgrading.
*9: Incomplete reference [25]. Please consider reviewing the style of References.
Responses *9: Thank you very much for your suggestion. Following your useful advice, I have completed reference [25] in the revised manuscript.
*10: Plagiarism are found in 3.2 in the text without citation on pages 9 and 10. Please check this issue!
Responses *10: Thank you for your advice. I have checked my paper and there is nothing you said. Some language expressions may be repeated with other documents, and I have made relevant adjustments. If you still think there is repetition, please let me know. Thank you
*11: Please check the paper for English editing and typos.
Responses *11: Thank you for your advice. I have checked the paper for English editing and typos. I have made relevant adjustments in the revised manuscript.
Reviewer 2 Report
Dear authors,
The article entitled study on digital hydraulic driving system of the belt conveyor deals with electro-hydraulic equipment of coal gangue belt conveyor. The article presents a hydraulic system scheme which uses digital valve instead of proportional valve and servo valve to control the belt conveyor propulsion system.
Please answer the questions:
How would a higher control frequency affect the flow control?
How can shift tracking control accuracy be improved?
What is the accuracy of the simulation compared to reality?
Thank you and have a nice day.
Best regards.
Author Response
Thank you very much for your valuable comments and suggestions which would be of great help to improve quality of our manuscript. I have modified the manuscript accordingly, and the detailed modifications
in the revision are listed below point by point. The questions and comments of the Reviewers are marked in blue, and the responses from the authors are marked in black. The modifications in the revision are marked by a yellow highlight tool.
Ø Responses to Reviewer #2
*1: How would a higher control frequency affect the flow control?
Responses *1: Because the hydraulic system studied in this paper adopts high-speed digital valve components, its control frequency directly affects the flow linearity and resolution of the valve. The control frequency affects the action speed of the valve core. In the whole hydraulic system, the dynamic characteristics of digital valve components should be fast in order to meet the control requirements. When the control frequency is relatively low, the response of the valve is slow. For the closed-loop control, the flow error and displacement error are large. When the control frequency is high, the response of the valve is fast, and the closed-loop control of the whole hydraulic system is more accurate.
*2: How can shift tracking control accuracy be improved?
Responses *2: In the hydraulic system, pressure sensors and displacement sensors are arranged to monitor the system pressure and hydraulic cylinder displacement respectively. When the sensor transmits the system pressure and displacement signals to the controller hardware, the actual signal and the expected signal are compared through the control program, and then the control signal of the digital valve is calculated through the control algorithm. After the digital valve obtains these control signals, it generates a response action, outputs accurate flow and pressure, and acts on the actuator. Through this real-time adjustment, the hydraulic system can accurately control the equipment.
*3: What is the accuracy of the simulation compared to reality?
Responses *3: In this paper, the model is accurately modeled from the bottom hydraulic components, and the detailed analysis and parameter optimization of each component are carried out. The difference between the simulation results and the actual results is very small, so each model is accurate. On this basis, an accurate system model is built and matched with the same control scheme as the actual situation. The whole simulation model is almost consistent with the actual working condition. Therefore, the error between the simulation results and the actual results is very small. For the large mechanical equipment, this deviation can be negligible. Compared with the actual situation, the simulation is accurate.
Author Response File: 
Author Response.docx
Round 2
Reviewer 1 Report
All my comments were taken into account and most of the corrections were made acceptably. A minor revision is still required. The article looks much better.
Incomplete reference [28]. Visit the site (https://www.hindawi.com/journals/amse/2018/2378576/) for this issue:
- "Show citation":
Meisheng Yang, Junhui Zhang, Bing Xu, "Experimental Study and Simulation Analysis on Electromagnetic Characteristics and Dynamic Response of a New Miniature Digital Valve", Advances in Materials Science and Engineering, vol. 2018, Article ID 2378576, 8 pages, 2018. https://doi.org/10.1155/2018/2378576
- complete the reference with this information.
A minor text editing check is still required.
Author Response
Thank you very much for your valuable comments and suggestions which would be of great help to improve quality of our manuscript. I have modified the manuscript accordingly, and the detailed modifications
in the revision are listed below point by point. The questions and comments of the Reviewers are marked in blue, and the responses from the authors are marked in black. The modifications in the revision are marked by a yellow highlight tool.
Ø Responses to Reviewer #1
*1: Incomplete reference [28]. Visit the site (https://www.hindawi.com/journals/amse/2018/2378576/) for this issue:
- "Show citation":
Meisheng Yang, Junhui Zhang, Bing Xu, "Experimental Study and Simulation Analysis on Electromagnetic Characteristics and Dynamic Response of a New Miniature Digital Valve", Advances in Materials Science and Engineering, vol. 2018, Article ID 2378576, 8 pages, 2018. https://doi.org/10.1155/2018/2378576
- complete the reference with this information.
Responses *1: Thank you very much for your suggestion. I have modified the paper accordingly and supplemented more information about the research in the revised manuscript.
Author Response File: Author Response.docx
