【正文】 third is once contactor refused to jump, by the general circuit breaker shunt tripping action execution protection.From the perspective of crane electrical, prevent to stop are key measures to monitor whether the brake contactor contact welding. QRIS type lifting mechanism control cabinet adopts non stop protection circuit diagram design.The design of circuit is posed of three parts. The first is to monitor, made with brake contactor K07 coil is connected in parallel with the intermediate relay, K07 and K1 under normal circumstances is the synchronization action. If the K7 due to contact welding cannot release, so both movement is inconsistent, it will start delay time link.Second links, namely time delay is borrowed from the original design in the K03 time relay, consists of parallel K7 normally closed contact and a normally open contact of the control K07. K7, K07 parallel contact under normal conditions is always connected, stopping only when the K7 contact occurs when welding condition and connection to disconnect. K03 time relay is energized immediately attracted, poweroff time delay time delay release, , so long as the control circuit on electric, K03 immediately. And the main controller S40. At the start, stop switch process, even though the K7, K07 contact action of petition, instantaneous disconnection coil circuit, K03 time delay closing of the normally closed contact remained disconnected, so K7, K07 parallel contact access K03 coil loop does not influence the normal work of K03.In an access of parallel contacts before, only in the main controller to rise or fall 3 Block 2 block, due to acceleration level contactor K42 electric, K42 normally closed contacts open, K03 power release, the normally closed contact of the time delay closing, accelerating stage contactor K41 can attract, resection of third level dynamic resistance. In the master control down 2 blocks a block 0, a rise of 1 block when switching between the master controller, 17, 18 and 19, 20 contacts are disconnected, accelerating stage contactor K42 cannot attract, K03 may 。 and reduce the system stream pressure loss, improves the efficiency of the system. Load sensing control valve as the load sensing system core ponents, has many kinds of structure types. In Kato, Tadahino and Liebherr crane control valve load sensing system, employs a constant difference wins flow valve type, the priority valve type and its bination form.3 heavy machine limited stop protectionCrane motor control contactors are often dense onoff, therefore prone to breakdown. When the crane is in the process of operation required for accurate localization or emergency stop, because if the contact welding leads the crane refused to stop, there may be a collision accident. In order to solve this problem, propose a crane lifting mechanism refused to stop protection design.From three aspects to solve this problem, it is a contactor contact welding leads to the action logic, which can increase a middle relay to judge。 machine memory a plurality of rated load curve, satisfy various working continuously alarm calls。 setting function, prevent parameter error setting。 a black box function, automatic recording overload time and then the operational parameters。 system of automatic fault detection, the results showed。 Engineering,1988:86～97（參考文獻(xiàn)未在正文標(biāo)出）附錄Truck crane hydraulic systemOne, domestic and foreign automobile crane hydraulic system new technology( a ) on truck crane hydraulic system security problems researchThe 1 generation of intelligent overload limiter of crane in automobile applicationThe third generation of microputer overload limiter ( XTⅢ), with independent intellectual property rights of domestic electromechanical integration device. The device is posed of a main machine part and a sensor part, microputer control, modular structure. Installation and missioning of all the key operation, large screen LCD dot matrix display, in the setting of parameters and the display is very concise, do not adjust any potentiometer, the debugging is simple and intuitive, friendly interface. Limiter adopts digital and large scale integrated circuit, reducing the failure, increases the capacity of resisting disturbance, thereby improving reliability。再次感謝邵俊鵬老師的指導(dǎo)，感謝指導(dǎo)過我的老師們，感謝在我畢業(yè)設(shè)計中給我?guī)椭乃腥?。在這半年的設(shè)計中我存在著許多難題和不解，邵老師在繁忙的教學(xué)和工作中，仍給于我及時的指導(dǎo)和幫助，使我的難題得到解決。我要感謝大學(xué)期間教育和指導(dǎo)過我的所有老師。希望通過畢業(yè)設(shè)計檢測自己的所學(xué)知識，無愧于大學(xué)四年的學(xué)習(xí)和老師們的教誨。雖然設(shè)計完成了，但是設(shè)計中還有些不足，在今后的工作學(xué)習(xí)中，可以在進(jìn)一步完善液壓起重機(jī)重鐵機(jī)構(gòu)動力學(xué)模型，進(jìn)行機(jī)構(gòu)的動力學(xué)仿真。在設(shè)計中我首先是對整個機(jī)構(gòu)的總體布局進(jìn)行了詳細(xì)的了解，其次是對各個部件進(jìn)行了選擇和設(shè)計。通過設(shè)計檢驗了我大學(xué)四年學(xué)習(xí)的水平，并有機(jī)會把理論知識運(yùn)用到實際的生產(chǎn)上去。本文對液壓起重機(jī)重鐵機(jī)構(gòu)進(jìn)行設(shè)計，主要是在提高起重機(jī)效率的同時保證其安全性，通過重鐵掛放機(jī)構(gòu)提高吊重作業(yè)的安全性。結(jié)論液壓起重機(jī)是裝在普通汽車底盤或特制汽車底盤上的一種起重機(jī)。隨工作部件運(yùn)動的管道可采用軟管、伸縮管或彈性管。 5. 硬管應(yīng)貼地或沿著機(jī)床外形壁面敷設(shè)。壓力表及其開關(guān)應(yīng)布置在便于觀察和調(diào)整的地方。手動換向閥的位置必須靠近操作部位。2. 考慮液壓油箱的大小與剛度，液壓泵與電動機(jī)裝在液壓油箱的蓋子上或裝在液壓油箱之外。為了增加電動機(jī)與液壓泵的聯(lián)接剛性，避免產(chǎn)生共振，本設(shè)計把液壓泵和電動機(jī)先裝在剛性較好的底板上使其成為一體，然后底板加墊再裝到液壓油箱蓋上。本設(shè)計采用法蘭支架式聯(lián)接。3. 法蘭支架式 電動機(jī)與液壓泵先以法蘭聯(lián)接，法蘭再與支架聯(lián)接，最后支架再裝在底板上。這種結(jié)構(gòu)對于保證同軸度比較困難（電動機(jī)與液壓泵的同軸度）。這種結(jié)構(gòu)裝拆很方便。 電動機(jī)與液壓泵的聯(lián)接方式電動機(jī)與液壓泵的聯(lián)接方式分為法蘭式、支架式和支架法蘭式。油箱內(nèi)部應(yīng)刷淺色的耐油油漆。油箱頂板需要裝設(shè)空氣濾清器，對進(jìn)入油箱的空氣進(jìn)行過濾，防止大氣中的雜質(zhì)污染液壓油。為了便于隨時檢查和觀察箱內(nèi)液體液位的情況，應(yīng)該在油箱壁板的側(cè)面安裝液面指示器，指示最高、最低油位。密封材料碎片、油漆皮和 紗纖維。過濾網(wǎng)通常使用50～100目左右的金屬網(wǎng)。泄漏油管以單獨(dú)配管為最好，盡量避免與回油管集流配管的方法。吸油管應(yīng)插入液壓油面以下，防止吸油時卷吸空氣或因流入液壓油箱的液壓油攪動油面，致使油中混入氣泡。濾油器要有足夠大的容量，避免阻力太大。對溢流閥、順序閥等，應(yīng)注意合理設(shè)計回油集管，不要人為地施以背壓。本設(shè)計的管口與箱底的距離為160mm，切口與箱壁的距離為250mm。管口應(yīng)切成，切口面向箱壁，與箱壁之距離為3倍管徑。5). 側(cè)板：側(cè)板厚度一般為3～4mm，側(cè)板四周頂部應(yīng)該加工成高出油箱頂板3～4mm，為了使液壓元件的在工作等的情況下泄漏出來的油不至于灑落在地面上或操作者的身上，同時可以防止液壓油箱的頂板在潮濕的氣候中腐蝕。隔板的安裝型式有多種，隔板一般沿油箱的縱向布置，其高度一般為最低液面高度的2/3～3/4。頂板上的元件和部件的安裝面應(yīng)該經(jīng)過機(jī)械加工，以保證安裝精度，同時為了減少機(jī)加工工作量，安裝面應(yīng)該用形狀和尺寸適當(dāng)?shù)暮皲摪搴附印D61：液壓油箱底部構(gòu)造的五種情況下圖所示為一般液壓油箱底面的構(gòu)造的五種情況，我們根據(jù)具體設(shè)計和生產(chǎn)的需要來確定液壓油箱底面的構(gòu)造，根據(jù)本設(shè)計的需要，選了（c）型構(gòu)造。一般采用型鋼來加工底腳。2). 底板與底腳：底板應(yīng)比側(cè)板稍厚一些，底板應(yīng)有適當(dāng)傾斜以便排凈存油和清洗，液壓油箱底部應(yīng)做成傾斜式箱底，并將放油塞安放在最低處。本設(shè)計中取油箱的壁厚為6mm。油箱的形狀一般是正方形或長方形，為了便于清洗油箱內(nèi)壁及箱內(nèi)濾油器，油箱蓋板一般都是可拆裝的。但有時為了提高冷卻效率，在安裝位置不受限制時，可將液壓油箱的容量予以增大，本設(shè)計中的油箱根據(jù)液壓泵與電動機(jī)的聯(lián)接方式的需要以及安裝其它液壓元件需要，,。為了防止液壓油從油箱中溢出，油箱中的液壓油位不能太高，一般不應(yīng)超過液壓油箱高度的80%。液壓油箱的有效容量可概略地確定為： （無表頭）系統(tǒng)類型