【正文】 油，實(shí)現(xiàn)動作，右行到終點(diǎn)時(shí)，缸 A 的擋鐵壓下行程開關(guān) 1XK，電磁鐵 2DT 通電，液壓供油又進(jìn)入缸 B 實(shí)現(xiàn)動作 2。右行到終點(diǎn)缸 B 活塞的擋鐵壓下行程開關(guān) 2XK，電磁鐵 1DT 斷電， 換向閥呈圖示狀態(tài)，壓力油進(jìn)入缸 A 右腔，左回油，活塞返回，缸 A 實(shí)現(xiàn)動作 3。左行到終點(diǎn)，缸 A 活塞的擋鐵壓下行程開關(guān) 3CK，電磁鐵 2DT斷電，壓力油又進(jìn)入缸 B 的左腔，活塞也返回，缸 B 實(shí)現(xiàn)動作 4，完成一個(gè)自動循環(huán)，活塞均退回原位，為下一循環(huán)作好準(zhǔn)備。 行程開關(guān)的順序動作回路 采用壓力繼電器實(shí)現(xiàn)順序動作的回路。此方法為了防止壓力繼電器發(fā)生誤動作，其壓力調(diào)整 數(shù)值一方面應(yīng)比先動的液壓缸的最高工作壓力高 ，另一方面要比溢流閥的調(diào)整壓力低 。 接通電源，打開開關(guān)，使缸 A 換向閥的電磁鐵 ID通電，壓力油進(jìn)入缸 A（假定是夾緊缸）左腔，推動活塞向右運(yùn)動，碰上定位擋鐵后（或夾工件后）系統(tǒng)壓力升高，安裝在缸 A 進(jìn)油腔附近的壓力繼電器發(fā)出電信號，使缸 B 換向的電磁鐵 2DT 通電，于是壓力油以進(jìn)入缸 B（假定為鉆削加工的進(jìn)給缸）的左腔，推動活塞向右運(yùn)動（開始鉆削加工），完成了一個(gè)完整的動作循環(huán)。見圖 2 壓力繼電器的順序動作回路 （ 2）實(shí)驗(yàn)步驟 檢查 在實(shí)驗(yàn)臺上搭建的液壓回路是否正確。如確定無誤，接通電源，啟動電氣控制面板的開關(guān)，把換向閥插座與電磁鐵換向閥進(jìn)行連接，啟動液壓油泵開關(guān)，調(diào)節(jié)電機(jī)調(diào)速器使達(dá)到預(yù)定的壓力，按動換向閥 1 或 2 達(dá)到實(shí)驗(yàn)預(yù)計(jì)的結(jié)果。 （二）利用壓力繼電器的順序動作回路 檢查在實(shí)驗(yàn)臺上搭建的液壓回路是否正確。如確定無誤，接通電源，啟動電氣控制面板的開關(guān)，把換向閥插座與電磁鐵換向閥進(jìn)行連接，啟動液壓油泵開關(guān)，調(diào)節(jié)電機(jī)調(diào)速器使達(dá)到預(yù)定的壓力，達(dá)到實(shí)驗(yàn)預(yù)計(jì)的結(jié)果。 四、實(shí)驗(yàn)結(jié)果分析及實(shí)驗(yàn)報(bào)告要求 ： 畫出所設(shè)計(jì)的液壓回路（畫出多種并符合要求 的建議評定成績考慮加分）。 寫出自己的設(shè)計(jì)思路和設(shè)計(jì)原理。 五、實(shí)驗(yàn)成績評定 (考試方法 )： 1．實(shí)驗(yàn)操作 10%，實(shí)驗(yàn)報(bào)告 15%。 2．該實(shí)驗(yàn)占總實(shí)驗(yàn)成績 25%（按所做過的實(shí)驗(yàn)抽簽選作）。 （英文版 ） Two regulations promulgated for implementation is in the party in power for a long time and the rule of law conditions, the implementation of prehensive strictly strategic plan, implementation in accordance with the rules and discipline to manage the party, strengthen innerparty supervision of major initiatives. The two regulations supporting each other, the code adhere to a positive advocate, focusing on morality is of Party members and Party leading cadres can see, enough to get a high standard。 rule around the party discipline, disciplinary ruler requirements, listed as negative list, focusing on vertical gauge, draw the party anizations and Party members do not touch the bottom line . Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulations the necessity and the revision process。 the second part is the interpretation of the two fundamental principles of the revision of laws and regulations in the party。 the third part introduces two party regulations modified the main changes and needs to grasp several key problems。 the fourth part on how to grasp the implementation of the two regulations of the party. code and Regulations revised the necessity and revised history of the CPC Central Committee the amendment to the Chinese Communist Party members and leading cadres honest politics several guidelines and Chinese Communist Party discipline and Punishment Regulations column 1 by 2020 to strengthen party laws and regulations focus. Two party regulations revision work lasted a Years, pooling the wisdom of the whole party, ideological consensus, draw historical experience, respect for the wisdom of our predecessors, which reflects the unity of inheritance and innovation。 follow the correct direction, grasp the limited goals, adhere to the party39。s leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the code and rule , reflects the party39。s 18 and the eighth session of the third, the spirit of the fourth plenary session, reflecting the experience of studying and implementing the General Secretary Xi Jinping series of important speech, reflects the party39。s eighteen years prehensive strictly practice. (a) revised two regulations of the party need of the ICAC guidelines in in 1997 Leaders as members of the Communist Party of China clean politics certain criteria (Trial) based on revised, the promulgation and implementation of January 2020, to strengthen the construction of the contingent of leading cadres play an important role. But with the party to manage the party strictly administering the deepening, has not been able to fully meet the actual needs. Content is too plicated, eight prohibition, 52 are not allowed to hard to remember, and also difficult to put into practice。 the second is concisely positive advocated by the lack of prohibited provisions excessive, no autonomy requirements。 the third is banned terms and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat。 the fourth is to clean the theme is not prominent, not for the existing problems, and is narrow, only needle of countylevel leading cadres above. rule is in 1997 Chinese Communist Party disciplinary cases (Trial) based on revision, in December 2020 the promulgation and implementation, to strengthen the construction of the party play very important role. Along with the development of the situation, which many provisions have been unable to fully meet the prehensive strictly administering the practice needs. One is Ji law, more than half of the provisions and criminal law and other countries laws and regulations Repetition。 two is the political discipline regulations is not prominent, not specific, for violation of the party constitution, damage the authority of Party Constitution of misconduct lack necessary and serious responsibility to pursue。 third is the main discipline for the leading cadres, does not cover all Party members. Based on the above situation, need to the criterion of a clean and honest administration and rule the two is likely to be more relevant regulations first amendment. By revising, really put the authority of Party discipline, the seriousness in the party tree and call up the majority of Party members and cadres of the party constitution of party passes party consciousness. (II) two party regulations revision process the Central Committee of the Communist Party of China attaches great importance to two regulations revision . Xi Jinping, general books recorded in the Fifth Plenary Session of the eighth session