【機械類畢業(yè)論文中英文對照文獻翻譯】拉臂式垃圾車設計
【機械類畢業(yè)論文中英文對照文獻翻譯】拉臂式垃圾車設計,機械類畢業(yè)論文中英文對照文獻翻譯,機械類,畢業(yè)論文,中英文,對照,對比,比照,文獻,翻譯,拉臂式,垃圾車,設計
附 錄A
The Design of Pull Arm Garbage Truck
1The introduction of Pull Arm Garbage Truck
Pull arm garbage truck is equipped with two types of chassis that has a trunk load and unloading functions to pull arm device-specific vehicles. It can be achieved with car trunk the combination and separation, while the bulk of the trunk to achieve self-unloading cargo operations. The model has been widely used in foreign countries, often in the domestic industry as a sanitation refuse collection vehicles. 5 t pull arm garbage truck is one of the commonly used models, compared to 8 t Arm pull over large tonnage trucks, the pull-arm device structure is relatively simple and easy to domestic Manufacturers; And large tonnage often imported pull arm device. Domestic Manufacturers producing 5 t pull the car pulling the boom arm structure of the device, although about the same, but the important structural parameters of the selection and design of different structural arrangement, it will directly affect the car performance.
2 Pull the boom structure and principle of the device
2.1 The structural characteristics of pull-arm device
5 t pull arm garbage truck pulling device consists of pulling the boom arm and pull arm cylinder, the United Moving frame, trunk insurance hook and cylinder, and the frame. La Boom device structural arrangement shown in figure 2, pull telescopic arm is not used right-angle bend structure. the end of the cylinder and pull the piston rod side arm hinged on the hinge pivot B; Another linkage frame front end and hinged at the hinge pivot C, the formation of a rotary arm pull heart. Cylinder head cylinder arm pull side hinged front frame on the hinge pivot A; linkage frame hinged rear axle frame rear hinge pivot D, the formation of linkage rotary frame heart. Insurance linkage trunk rack hook set the hook cylinder and insurance cylinder.
2.2 The working principle of the device arm pull
Pulling garbage truck arm by pulling the device to complete the function of two different dynamic, for boxes and dumping. When the pull device for boom box action, the first cylinder insurance hook action open the trunk insurance hook, trunk lift insurance. Pull lift arm cylinder piston rod elongation from the pull arm, pull arm to pivot around the hinge C clockwise rotation, the hook arm to pull back move. If the frame is equipped with a trunk, the trunk was pushed home ground. When put on the frame, so that the first hook retractor trunk rings, and contraction of the piston rod, pull arm to hinge pivot counter-clockwise rotation axis C, will put on the flat trunk, the insurance cylinder hook action, pull carriages insurance hook fixed to the frame to the trunk.
When the pull-arm device dumping action, and action for different box, trunk insurance hook dump in the whole process to ensure that tension in the arm and trunk are not isolated, that is pull arm、the linkage through the trunk rack and trunk link between the insurance as one of the hook, by the deputy rear frame hinge pivot clockwise rotation axis D, lifting carriages lifted until the refuse rubbish. Trunk reset, as long as the retraction of cylinder piston rod pull arm, the pulling arm body still hinge pivot point D is the shaft counterclockwise rotation, until the trunk reset.
3 La Boom Selection and design of device structure parameters
3.1 Device to pull the boom pivot hinge arrangement and geometry of the main structure
Determined by the following three areas:
a. Arm by pulling a dump truck performance, it is 5 t pull the best selection of cars from the arm unloading chassis, the chassis can be selected according to the length of pull arm device to determine frame the total length. To ensure the car to pull arm for changing trunk and dumping action by the force of the chassis reasonable and complete the dumping arm pull action pivot hinge rotation axis D of the location should be arranged in behind the rear spring plate from the chassis rear bearing axis, the spacing is about 0 ~ 100 mm.
b. According to the first hinge pivot D arm pull for me the beginning of the selected pivot hinge rotation axis C. In the design and production of the actual process of pulling the car arm in arm had appeared during the pull action although the initial state, pull arm lift carriages, failed to pull arm pivot around the hinge C rotation, but with the linkage frame with the rotation around the hinge pivot point D, which can not get trunk open the beginning of fall; when lifting a certain height, the action of gravity in the trunk, the hinge will pivot C a sudden fall, so pull arm, the linkage frame and carriages suddenly drop, resulting in relatively large; in hit, resulting in extremely unsafe for me a smooth action. To resolve this problem, determine the hinge point C of the axis position is especially important. First the one hand, the horizontal axis of pivot C can not above the level layout of pivot D. In addition, by the hinge can pivot C stress analysis know, the hinge pivot axis of C must be below the level of tension hinge pivot arm cylinder head horizontal axis, while the hook arm pull-start action must be arranged in the vertical axis of the hinge pivot between C and the hinge pivot left foot.
c. Important geometrical parameters arm pull a pull arm foot radius of gyration for pull the oil boom turning radius of the cylinder piston rod end of radius of gyration of the angle between the two radius. From the above points analysis we know that, The smaller of radius. The greater the force needed to pull the smaller cylinder arm. Meet the requirements under the premise of arms-for-me pull-foot turning radius, the smaller the better, La boom cylinder rod side radius of gyration R. The bigger the better as far as possible, so that can pull compact boom, operating small space.
3.2 The selection of pull arm cylinder and cylinder installation angle y. The range of
Determined by the following two aspects:
a. By mapping method or analytical method to determine the location of the above the hinge pivot and Pull arm geometry and other components, may initially determine the pull-stroke arm cylinder and installation distance.
b. Pull arm cylinder mounting angle of La Boom is the important structural parameters of devices. By the former knowledge, pull the boom box or device for carrying out the process of dumping action, pull the oil boom cylinders have to be overcome trunk (full load) resistance torque generated by gravity, and the lifting crane action start unloading boxes when the moment of resistance is the greatest moment of resistance to overcome, and in Boom began pulling action of the hinge pivot device static friction and inertia moment of resistance Maximum torque. So pull arm cylinder mounting angle y. From the previous analysis we know, when angle larger, the pull arm cylinder smaller maximum thrust required, select the pull arm cylinder bore can be smaller.
By pulling in the boom cylinder is installed between the frame and trunk floor, oil cylinder installation layout space is limited, so the pull arm cylinder mounting angle range is also very limited. Design principles to children as much as possible to install a large angle, choose the right drawing arm oil pulling arm cylinder bore to meet performance requirements for the use of vehicles, without increasing the cost and fuel tank weight, and easy layout. Analysis and comparison of some domestic manufacturers to produce 5 t pull arm ,the actual design and production of cars and trucks pulling arm experience, 5 t pull arm around the installation space vehicles between 250 ~ 300 mm, the general tension arm cylinder mounting angle should be Taken between 3°~5°.
附 錄B
拉臂式垃圾車設計
1拉臂車概述
拉臂式垃圾車是在二類汽車底盤上裝有使車箱具有裝載和卸載功能的拉臂架裝置的專用汽車。它可實現車箱與汽車的結合和分離，同時對車箱的散裝貨物實現自卸作業(yè)。目前該車型已在國外得到廣泛使用，在國內也常作為環(huán)衛(wèi)行業(yè)的垃圾收集運輸車。5 t拉臂式垃圾車是常用車型之一，相比8 t以上的大噸位拉臂車，其拉臂架裝置結構較簡單，便于國內廠家生產；而大噸位拉臂車常采用進口拉臂架裝置。國內各生產廠家生產的5 t拉臂車的拉臂架裝置的結構雖大致相同，但重要的結構參數的選用和結構布置設計的不同，會直接影響拉臂車的工作性能。
2拉臂裝置的結構和工作原理
2．1拉臂架裝置的結構特點
5 t拉臂式垃圾車拉臂架裝置主要由拉臂和拉臂油缸、聯(lián)動架、車箱保險鉤和保險鉤油缸、以及副車架組成。拉臂采用的是不可伸縮的直角折彎式結構，其一端與拉臂油缸的活塞桿端鉸接于鉸支點B,另一端與聯(lián)動架前端軸心鉸接于鉸支點C，形成了拉臂的回轉軸心。拉臂油缸的缸頭端鉸接在副車架前端鉸支點A上；聯(lián)動架后端軸心鉸接在副車架后部的鉸支點D，形成聯(lián)動架的回轉軸心。聯(lián)動架上設置了車箱保險鉤和保險鉤油缸。
2．2拉臂架裝置的工作原理
拉臂式垃圾車通過拉臂架裝置完成兩種不同的功能動作：換箱和傾卸。當拉臂架裝置進行換箱動作時，首先保險鉤油缸動作，開啟車箱保險鉤，車箱解除了保險。拉臂油缸活塞桿伸長舉起拉臂，使拉臂繞鉸支點c順時針回轉，拉臂鉤就往后移動。如果副車架上裝有車箱，則車箱被推置地上。當地上車箱要提上車架時，使拉鉤先鉤住車箱吊環(huán)，然后收縮活塞桿，使拉臂以鉸支點c為軸心逆時針回轉，將車箱提上放平后，保險鉤油缸動作，拉起車箱保險鉤，使車箱固定在副車架上。當拉臂架裝置進行傾卸動作時，與換箱動作不同，車箱保險鉤在整個傾卸過程中要處在保證拉臂與車箱不分離，即拉臂、聯(lián)動架及車箱通過車箱保險鉤相互聯(lián)結為一體，以副車架后部鉸支點D為軸心順時針回轉，舉升車箱直到卸去垃圾。車箱復位時，只要拉臂油缸活塞桿回縮，整個拉臂機構仍以鉸支點D為轉軸點逆時針回轉，直至車箱復位。
3拉臂架裝置結構參數選用與設計
3．1拉臂架裝置各鉸支點的布置及主要結構幾何尺寸
按以下三方面確定：
a．因拉臂車具有傾卸工作性能，故5 t拉臂車最好選用自卸底盤，可根據所選定的底盤長度，確定拉臂架裝置副車架的總長度。為了保證拉臂車進行換箱和傾卸動作時底盤受力合理，拉臂完成傾卸動作的回轉鉸支點D的軸線位置應布置在距底盤后輪彈簧鋼板后支座軸線的后部，間距約為0～100mm。.
b．根據鉸支點D先初選定拉臂換箱回轉鉸支點c的軸線位置。在設計生產5 t拉臂車的實際過程中，曾出現拉臂在進行換箱動作初始狀態(tài)時拉臂雖舉升車箱，但拉臂未能繞鉸支點C轉動，卻隨聯(lián)動架一起繞鉸支點D轉動，從而無法讓車箱開始下滑；當舉升一定高度后，在車箱重力作用下，鉸支點C會突然落下，使拉臂、聯(lián)動架及車箱突然下落，產生較大；中擊，造成換箱動作極不安全平穩(wěn)。要解決此問題，確定鉸支點C的軸線位置尤其重要。首先一方面鉸支點C水平軸線不能高于鉸支點D水平軸線布置。另外，由鉸支點C受力分析可知，鉸支點C的水平軸線必須低于拉臂油缸缸頭鉸支點A的水平軸線，同時起始動作時拉臂鉤垂直軸線必須布置在鉸支點C和鉸支點A之間。
c．拉臂重要結構幾何參數有拉臂換箱回轉半徑、拉臂油缸活塞桿端回轉半徑、兩回轉半徑之間的夾角。由前述分析可知，越小，越大，則拉臂油缸所需的作用力越小。故在滿足使用要求的前提下，拉臂換箱回轉半徑越小越好，拉臂油缸活塞桿回轉半徑盡可能越大越好，這樣可使拉臂結構緊湊，作業(yè)空間小。
3．2拉臂油缸的選用和油缸安裝角的取值范圍
按以下二方面確定：
a．通過作圖法或解析法計算確定以上各鉸支點的位置和拉臂等構件的幾何尺寸后，可初步確定拉臂油缸的最大行程和安裝距。計算出油缸作用力和的值，作為油缸的負載依據來確定油缸缸徑。
b．拉臂油缸安裝角是拉臂架裝置重要的結構參數。由前述知，拉臂架裝置在進行換箱或傾卸動作的過程中，拉臂油缸均要克服車箱(滿載)的重力產生的阻力矩，而且吊裝吊卸車箱起始動作時的阻力矩是要克服的最大阻力矩，而且在開始動作時拉臂架裝置的各鉸支點的靜摩擦阻力矩和慣性阻力矩最大。故拉臂油缸安裝角需滿足。由前分析所知，當越大時，拉臂油缸所需的最大推力就越小，選擇的拉臂油缸缸徑就可越小。
因拉臂油缸的安裝位置位于副車架和車箱底板之間，油缸安裝布置空間有限，故拉臂油缸的安裝角取值范圍也極為有限。設計原則是要盡可能使安裝角兒大，選擇合理的拉臂油缸缸徑來滿足拉臂車的使用性能要求，不增加油缸的成本和重量，同時便于布置。分析比較國內一些廠家生產的5 t拉臂車及實際設計生產拉臂車的經驗，5 t拉臂車安裝空間約在250～300mm之間，一般拉臂油缸安裝角應在3°～5°之間取值。
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