左側(cè)桿402和右側(cè)桿403上外側(cè)的豎直方向均等間距間隔設(shè)置有橫桿700，且間距設(shè)置為30-35cm(本實(shí)施例優(yōu)選 30cm)；橫桿700的延伸方向?yàn)樗椒较?，且平行于背?20；橫桿700的長(zhǎng)度設(shè)置為15cm-20cm(本實(shí)施例優(yōu)選為15cm)，橫桿700外套設(shè)有防滑橡膠套(未示出)。

通過(guò)上述技術(shù)方案，使得檢修人員在鏈?zhǔn)缴笛b置300出故障時(shí)，可踩踏橫桿700爬出箱體100，屬于應(yīng)急預(yù)案，上述橫桿700的間距和長(zhǎng)度的優(yōu)選值均是為了檢修人員更好的攀爬。

如附圖2和附圖5所示，左側(cè)桿402和右側(cè)桿403的互相相對(duì)的內(nèi)側(cè)均設(shè)置有限位擋塊550，且限位擋塊550位于同一水平面。限位擋塊550設(shè)置于升降臺(tái)500的豎直方向的上方；且限位擋塊550與升降臺(tái)500在豎直方向存在重合區(qū)域；限位擋塊550的豎直方向的高度低于驅(qū)動(dòng)電機(jī)604和旋轉(zhuǎn)齒輪 601的豎直方向的高度。

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通過(guò)設(shè)置限位擋塊550，以限定升降臺(tái)500可上升的最高高度，防止升降臺(tái)500對(duì)驅(qū)動(dòng)組件600產(chǎn)生沖撞。

牽引鏈條602的長(zhǎng)度設(shè)置為當(dāng)所述升降臺(tái)500上升至最高點(diǎn)時(shí)所述配重塊603仍不與地面接觸；防止配重塊603觸地而干擾升降臺(tái)500的重力平衡。