1.“次” to use times you can repeat I.E. 去了一次上海, 给他送了两次水果 2.“遍” means the whole process from beginning to end I.E. 读三遍 写了两遍 听了很多遍 3.“趟” moving I.E. 去了两趟北京 往他家跑了三趟

次 embellishes you do something you can do it again and again, almost costs nothing or costs little.我上了两次厕所，打了一次篮球，去了一次网吧，and so on. 趟 embellishes something you can't do it regularly, costs high or a lot of energy. 出了一趟远门，一趟火车， 遍 embellishes something you need to do it again and again,but in fact,it is similar to 次,When do they use depends on the fixed collocation

I don't know how to answer your question. But I can provide some examples that may help. ①我要去一趟超市。 I want to go to the market. ②小明说他想在晚饭前去一趟超市。 Xiaoming said that he wanted to go to the market before dinner. ③她为了买那本书跑了一趟又一趟书店。 For the book,he goes to the bookstore again and again. ④我们再能见一次面吗？ Shall we meet once more ? ⑤这是我们最后一次相见。 This is our last meet. ⑥他每周去游泳三次。 He goes swimming three times a week. ⑦这本书我已经看了三遍了。 I have read this book for three times. ⑧参观过这个博物馆三遍，我了解了它的一切。 Having visited the museum three times,I know everything of it. If there is any mistake,be free to point it out. (●°u°●)​ 」

"Once" means that something occurred a total of one time only. This could be past tense or future. For example: Past: "Once upon a time, we lived a happy life." Future: "Once you get your degree, you will be able to find a good job." "Twice" means that something occurred a total of two times only. For example: "I went to the dentist twice this month." Or "I went to the dentist two times this month." "3 times" means that something occurred a total of 3 times only. These things do not have to happen all at one time. For example: "I eat 3 times per day: once in the morning, once in the afternoon, and once in the evening." 3 times could also be related to a mathematical equation. For example: 3 times 2 equals 6. This is the same as saying to count 3 sets of something two times (or twice) -- 3 + 3 = 6 I hope this helps. :-)

次和趟比较接近 多指的是城市 地方 go somewhere(city) many times, 遍多用在 look listion等 动词后