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2022 華南展招展書
MES

MWMS 暖冬系列五:仙工智能 MWMS 如何解決倉儲物流從人工作業到自動化作業的難題?

  2022年02月14日  

  倉儲物流作業,從人工到自動化,一切應該變得更加準確高效、省心省力……管理員只需要每天早上打開電閘開關,泡杯茶,一切就自動運行起來了……

  可惜,這不是現實……

  幾年前,跟一個老板朋友聊天,他的工廠深受人力不足困擾,但他卻不敢輕易上自動化生產線。因為同一地區的一家相似工廠,在上了自動化產線后,雖然每日效率有很大提升,但平均每個月都要因為故障停線兩次。每次停線排查故障都要兩三天。算上相關物料損耗,整體并不合算。

  自動化、智能化的倉儲物流設備雖然經過十多年發展,但目前仍無法保證百分百不出問題。這里我們不想過分強調設備的故障率。因為即使設備不出故障,工人、訂單等也會出錯。既從全局和整體看,出錯無法避免。

  關鍵是,自動化水平越高、軟硬件集成程度越高,故障往往越難恢復。

  純人工作業時,故障恢復幾乎不是問題:只需要制定合適的作業流程,發揮人的主觀能動性,撤單、調整庫存、重新搬運……都不是問題。緊急情況,人可以加班。庫亂了、帳亂了,可以重新盤點。下錯的訂單,可以打電話求人改掉;一個電話解決不了就打兩個,兩個不行就三個……沒有“人”解決不了的問題。

  另一個極端,如果系統是全自動的,由幾個子系統和眾多設備構成,故障的解決就復雜了。

  首先,故障具有傳播性。例如,入庫錯誤可能牽涉庫存、入庫單、采購、財務幾個環節。如果這些系統是打通的、自動的,需要系統之間都具有逆向流程。出錯后,要改庫存、撤銷入庫單、修改采購、作廢業務單據……

  其次,定位故障更難。報錯的系統、設備未必是真發生故障的系統、設備。例如,雖然我故障了,但是因為我收到了上游的錯誤指令。錯誤還是在上游。

  最后,故障可能演變為崩潰。故障往往是設計時忽略的問題;系統、設備可能沒有設計很好的保護機制。于是導致系統數據混亂、設備過載,最終導致不可逆的后果。有些客戶,在業務高峰、緊張的時候,反而不敢全部使用自動化。在重大活動或生產前,要人工調整計劃,做很多準備。用戶的不信任從側面反映了相關產品在穩定性、故障恢復方面的水平和問題。

  綜上,要嚴肅實現倉儲物流的自動化、信息化、智能化,系統和設備必須嚴肅對待故障處理。不僅要應對自己犯錯,也要應對用戶犯錯。MWMS 在設計之初就充分考慮了故障的處理。而且為了更高效地處理故障,我們將故分為三類。首先是業務阻塞。對于業務阻塞,系統會自動進行重試,當條件具備時自動恢復執行。例如,出庫時庫存可能不足,或者搬運時目標庫區可能已經全部填滿,沒有空庫位。對于這類錯誤,如果需要用戶不斷盯著系統,當條件改變時重新下單,很笨拙。但如果完全不提示用戶,用戶可能不清楚目前業務停滯不前的原因。

  MWMS 會在業務阻塞時推送消息給界面。在阻塞消除后自動消警。對于每條阻塞,用戶可以點擊查看阻塞原因,以便更快解決問題。其次是需要人工介入的故障。例如,機械結構出現輕微故障,有障礙物、異物,機器人故障無法繼續工作。發生這類問題后,MWMS 會在界面上報警,顯示故障和可能的原因。工人根據提示先介入解決問題,然后在界面上點擊“重試”類的按鈕,整體業務就可以繼續進行。如果可能有多種解決辦法,會分別提示。例如如果與第三方系統通訊失敗。會提示用戶此問題,請用戶檢查網絡,如果網絡沒有問題。嘗試斷開重連……最后是任務失敗。如果因為軟硬件設計問題,如流程不合理、軟件 BUG 等,任務只能先失敗。但找到問題、修改 BUG 后,允許對失敗的任務從錯誤的地方繼續執行。通過以上三種手段,我們的目的是加快故障恢復速度,減少停線時間;盡量避免失敗后重做業務,因為往往很花時間。故障不可怕,可怕的是無法解決。

  完善故障處理機制非常耗費資源。僅從開發工作量上說,錯誤處理耗費的開發資源是正向流程的三倍以上。市面上有很多產品在“蒙頭趕路”,僅僅具備了初步的正向流程功能就發布給客戶使用;因為這樣速度快、成本低,但實質上是把問題留給了客戶。除了成本,還有難度:處理故障比處理正向流程更難,難很多。甚至有些細節觸及了技術瓶頸,遠比想象復雜。例如,為圍繞“從錯誤處繼續”,MWMS 設計了很多機制,要為此改動底層框架,處理復雜的線程、并發、異常等問題。目前整體上,倉儲物流行業相關智能軟硬件產品,在處理好故障方面還有很長的路要走。誠實地說,雖然投入了大量資源,MWMS 在故障處理上,仍處于初期階段;暫時無法達到真“人工智能”的水平。仙工智能會在此方面持續保持高投入,甚至將其作為 2022 年最重點的工作之一。我們希望向大家提供故障更少、更易恢復的產品,為客戶創造更高的價值。推動真無人、全自動、高智能倉儲物流項目早日真正實現。

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