JP4184353B2 - Retractable loading platform lifting device - Google Patents

Retractable loading platform lifting device Download PDF

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JP4184353B2
JP4184353B2 JP2005063771A JP2005063771A JP4184353B2 JP 4184353 B2 JP4184353 B2 JP 4184353B2 JP 2005063771 A JP2005063771 A JP 2005063771A JP 2005063771 A JP2005063771 A JP 2005063771A JP 4184353 B2 JP4184353 B2 JP 4184353B2
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load receiving
receiving table
vehicle
control valve
slide cylinder
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JP2006248263A (en
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良和 堀之内
威 古川
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Shinmaywa Industries Ltd
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Description

本発明は、車両の下部側の空間に格納可能な格納式荷受台昇降装置に関する。   The present invention relates to a retractable cradle lifting device that can be stored in a lower space of a vehicle.

荷受台昇降装置とは、車両の荷台床面高さと地面高さとの間で荷受台を昇降させ、車両の荷台に対する荷や作業者の積み下ろし作業を支援するものである。荷受台昇降装置の中で、折り畳んだ荷受台を作業時の位置よりも前方にスライドさせて車両の下部側の空間に格納することができるように構成されたものが格納式荷受台昇降装置である。一般に、この種の格納式荷受台昇降装置において、荷受台の昇降とスライドの動作用アクチュエータにシリンダ（リフトシリンダ及びスライドシリンダ）を採用したものがある（特許文献１等参照）。   The load receiving platform lifting device lifts and lowers the load receiving platform between the height of the loading platform floor of the vehicle and the height of the ground, and supports the loading and unloading work of the operator on the loading platform of the vehicle. Among the load receiving platform lifting and lowering devices, the retractable load receiving platform lifting and lowering device is configured such that the folded load receiving platform can be slid forward from the working position and stored in the space on the lower side of the vehicle. is there. In general, there is a retractable load receiving device lifting device of this type that employs a cylinder (lift cylinder and slide cylinder) as an actuator for lifting and lowering the load receiving device and a slide (see Patent Document 1, etc.).

特開２００５−１４８２７号公報JP 2005-14827 A

リフトシリンダとスライドシリンダを用いた格納式荷受台昇降装置では、荷受台を格納するとき、地面上で折り畳まれた荷受台を、リフトシリンダによって格納位置の高さまで上昇させた後にスライドシリンダで車両の下部空間にスライドさせる。その際、操作利便性や動作確実性に配慮し、折り畳まれた荷受台が格納位置の高さに達したことがセンサで検出され、その検出信号が入力されると荷受台の動作が上昇からスライドへと連続的に移行するように構成されている場合がある。   In a retractable load receiving and lifting device using a lift cylinder and a slide cylinder, when storing the load receiving stand, the load receiving stand folded on the ground is raised to the height of the storage position by the lift cylinder, and then the vehicle is moved by the slide cylinder. Slide into the lower space. At that time, in consideration of operational convenience and operational certainty, the sensor detects that the folded cradle has reached the height of the storage position, and when the detection signal is input, the operation of the cradle increases. It may be configured to move continuously to a slide.

このように格納動作時に荷受台の動作が上昇からスライドへ連続的に移行するとき、シリンダへの圧油の供給パターンや機械的な動作方向が急激に切り換わること等により作動音や衝撃音が生じる場合がある。こうした作動音や衝撃音が生じても機械的な信頼や安全の面で何等問題にはならないが、操作するオペレータの心理面に配慮すれば静寂性に改善の余地がある。   In this way, when the operation of the cargo cradle continuously shifts from ascending to slide during the storing operation, the operating sound and impact sound are generated due to the sudden change of the pressure oil supply pattern to the cylinder and the mechanical operating direction. May occur. Even if such an operating noise or impact noise is generated, there is no problem in terms of mechanical reliability and safety, but there is room for improvement in quietness in consideration of the psychological aspect of the operating operator.

本発明は、以上の点に鑑みなされたものであり、その目的は、荷受台の格納動作時において上昇からスライドに動作が切り換わる際に生じる発生音を抑制することができる格納式荷受台昇降装置を提供することにある。   The present invention has been made in view of the above points, and an object of the present invention is to raise and lower the retractable load receiving table that can suppress the sound generated when the operation is switched from ascending to slide during the storing operation of the load receiving stand. To provide an apparatus.

上記目的を達成するために、第１の発明は、車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、圧油を吐出する油圧ポンプと、この油圧ポンプからの圧油で駆動されるものであって、伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、このスライドシリンダのボトム側と前記油圧ポンプとを接続する圧油供給管路と、この圧油供給管路に設けられ、前記油圧ポンプと前記スライドシリンダのボトム側との連通・遮断状態を切り換える伸長動作用コントロールバルブと、この伸長動作用コントロールバルブよりも下流側の位置で前記圧油供給管路から分岐され作動油タンクに接続された圧油排出管路と、この圧油排出管路に設けられ、前記スライドシリンダのボトム側と前記作動油タンクとの連通・遮断状態を切り換える縮退動作用コントロールバルブと、前記荷受台の上昇動作開始時から前記縮退動作用コントロールバルブの連通位置への切り換わり後設定時間が経過するまでの間、前記伸長動作用コントロールバルブを連通位置に保持して前記圧油供給管路を前記作動油タンクに連通し、縮退動作の初動時の前記スライドシリンダの保持圧を開放して前記設定時間経過後に前記伸長動作用コントロールバルブを遮断位置に切り換える保持圧開放手段とを備えたことを特徴とする。 To achieve the above object, according to a first aspect of the present invention, there is provided a retractable load receiving base lifting device having a load receiving base that can be stored in a lower space of a vehicle, a hydraulic pump that discharges pressure oil, It is driven by pressure oil, and slides the load receiving base in the retracted state along with the extending operation, and slides the load receiving base toward the front side of the vehicle along with the retracting operation. A slide cylinder stored in a lower space of the vehicle; a pressure oil supply line connecting a bottom side of the slide cylinder and the hydraulic pump; and the hydraulic pump and the slide cylinder provided in the pressure oil supply line Control valve for extending operation to switch the communication / blocking state with the bottom side of the oil, and hydraulic oil branched from the pressure oil supply pipe at a position downstream of the control valve for extension operation A hydraulic fluid discharge conduit connected to tank, and this provided the hydraulic fluid discharge conduit, compressing operation control valve for switching communication and cut-off state between the hydraulic oil tank with the bottom of the slide cylinder, the consignee between the time the lifting operation start of the table until after the Ri cut drop-in replacement for the set time to the communication position of the compressing operation for the control valve has elapsed, the hydraulic fluid supply pipe to hold the extension operation for the control valve to the communicating position And a holding pressure releasing means for communicating the path to the hydraulic oil tank, releasing the holding pressure of the slide cylinder at the initial operation of the retracting operation, and switching the control valve for the extension operation to the cutoff position after the set time has elapsed. It is characterized by that.

第２の発明は、車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、前記荷受台を昇降させるリフトシリンダと、伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記リフトシリンダによる前記荷受台の上昇動作が完了してから設定時間経過後に前記スライドシリンダに縮退動作を開始させる縮退動作遅延手段とを備え、前記縮退遅延手段は、格納動作時における前記リフトシリンダの上昇動作が完了し前記荷受台が格納高さに到達したことを検出する検出手段と、この検出手段からの検出信号が入力されると前記リフトシリンダの動作を停止させ、その後タイマの時間計測により前記設定時間が経過したら前記スライドシリンダの縮退動作を指令する指令信号を出力するリレー回路又はコントローラとを有することを特徴とする。 According to a second aspect of the present invention, there is provided a retractable load receiving base lifting apparatus having a load receiving base that can be stored in a space on a lower side of a vehicle, and a lift cylinder that lifts and lowers the load receiving base, and the load receiving base that is retracted in accordance with an extending operation. A slide cylinder that slides to the rear side of the vehicle and slides the load receiving table to the front side of the vehicle and retracts in the lower space of the vehicle in accordance with a retracting operation; and the load receiving table at the time of the storing operation of the load receiving table. when shifting from upward movement to the slide operation, and a restricted operation delay means for starting the compressing operation on the slide cylinder after the set time elapsed from the said receiving platform rising operation by the lift cylinder is completed, the degenerate delay means Is a detecting means for detecting that the lifting operation of the lift cylinder during the storing operation has been completed and the load receiving table has reached the storing height; A and the detection signal of the input operation of the lift cylinder is stopped, then with a relay circuit or controller the set time by the time measurement of the timer is the output of the command signal for commanding the restricted operation of the slide cylinder after the lapse It is characterized by that.

第３の発明は、車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、前記荷受台を昇降させるリフトシリンダと、伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記スライドシリンダの縮退動作の初動時に設定時間の間で動作速度が徐々に加速されて設定速度に達するように前記スライドシリンダを動作制御する制御手段とを備え、前記制御手段は、前記スライドシリンダ又は前記リフトシリンダに圧油を切換供給する比例電磁式のコントロールバルブと、前記設定時間の間に格納したプログラムに従って増大又は減少する指令信号を前記コントロールバルブに出力するコントローラとを有することを特徴とする。 According to a third aspect of the present invention, there is provided a retractable load receiving device lifting device having a load receiving table that can be stored in a space on a lower side of a vehicle. A slide cylinder that slides to the rear side of the vehicle and slides the load receiving table to the front side of the vehicle and retracts in the lower space of the vehicle in accordance with a retracting operation; and the load receiving table at the time of the storing operation of the load receiving table. Control means for controlling the operation of the slide cylinder so that the operation speed is gradually accelerated during a set time to reach the set speed when the slide cylinder is moved from the ascending operation to the slide operation. The control means includes a proportional electromagnetic control valve that switches and supplies pressure oil to the slide cylinder or the lift cylinder, and a gap between the set time. And having a controller for outputting a command signal to increase or decrease in accordance with the program to the control valve.

第４の発明は、車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、前記荷受台を昇降させるリフトシリンダと、伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記リフトシリンダによる前記荷受台の上昇動作完了時に設定時間の間で動作速度が徐々に減速されて停止するように前記リフトシリンダを動作制御する制御手段とを備え、前記制御手段は、前記スライドシリンダ又は前記リフトシリンダに圧油を切換供給する比例電磁式のコントロールバルブと、前記設定時間の間に格納したプログラムに従って増大又は減少する指令信号を前記コントロールバルブに出力するコントローラとを有することを特徴とする。 According to a fourth aspect of the present invention, there is provided a retractable load receiving base lifting device having a load receiving base that can be stored in a space on a lower side of a vehicle, and a lift cylinder that lifts and lowers the load receiving base, and the load receiving base that is retracted in accordance with an extension operation. A slide cylinder that slides to the rear side of the vehicle and slides the load receiving table to the front side of the vehicle and retracts in the lower space of the vehicle in accordance with a retracting operation; and the load receiving table at the time of the storing operation of the load receiving table. Control means for controlling the operation of the lift cylinder so that the operation speed is gradually reduced and stopped during a set time when the lift cylinder completes the lift operation of the load receiving table when the lift operation is shifted to the slide operation. wherein the control means, said slide cylinder or the control valve of the lifting cylinder to the switching supplies proportional electromagnetic pressure oil, during said set time And having a controller for outputting a command signal to increase or decrease according to pay the program to the control valve.

本発明によれば、荷受台の格納動作時において、上昇からスライドへの荷受台の急激な動作の切り換えを抑制することにより、その際に生じる発生音を抑制することができる。   According to the present invention, during the storage operation of the cargo cradle, by suppressing the rapid switching of the operation of the cargo cradle from ascending to slide, it is possible to suppress the sound generated at that time.

以下に図面を参照して本発明の実施の形態を説明する。
図１は本発明の一実施の形態に係る格納式荷受台昇降装置を搭載した車両の全体構造を表す側面図である。以降、この図１中における左側を車両の前側、右側を後側、紙面直交方向手前側を左側、紙面直交方向奥側を右側とする。
図１に示した車両は、車体（車枠）１の前方に設けられた運転室２、車体１上に設けられた荷台３、及び車体１の後部に設けられた格納式荷受台昇降装置４を備えている。この格納式荷受台昇降装置４は、走行運転時等には荷受台５を折り畳んで車体１の下部側の空間に荷受台を格納可能であり、また荷物の積み下ろし作業時等にはその作業支援のために荷受台５を後方にスライドさせて展開し荷台３の床面高さと地面高さとの間で昇降可能である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing the overall structure of a vehicle equipped with a retractable load receiving device lifting apparatus according to an embodiment of the present invention. Hereinafter, the left side in FIG. 1 is the front side of the vehicle, the right side is the rear side, the front side in the direction orthogonal to the plane of the paper is the left side, and the back side in the direction orthogonal to the plane of the paper is the right side.
The vehicle shown in FIG. 1 includes a driver's cab 2 provided in front of a vehicle body (vehicle frame) 1, a loading platform 3 provided on the vehicle body 1, and a retractable loading platform lifting device 4 provided at the rear of the vehicle body 1. I have. The retractable load receiving platform lifting / lowering device 4 can fold the load receiving stand 5 to store the load receiving stand in the space on the lower side of the vehicle body 1 at the time of traveling operation, etc. Therefore, the load receiving platform 5 is slid rearward and deployed, and can be raised and lowered between the floor height of the loading platform 3 and the ground height.

図２は格納時の格納式荷受台昇降装置４の詳細構造を表す斜視図、図３は展開時の格納式荷受台昇降装置４の詳細構造を表す斜視図である。
図２及び図３において、格納式荷受台昇降装置４の構成要素は、上記荷受台（プラットフォーム）５、この荷受台５等を含むユニットを前後方向にスライドさせるスライド駆動部６、及び荷受台５を昇降させる昇降駆動部７を備えている。 FIG. 2 is a perspective view showing the detailed structure of the retractable load receiving device elevating device 4 during storage, and FIG. 3 is a perspective view showing the detailed structure of the retractable load receiving device lifting device 4 during deployment.
2 and 3, the components of the retractable load receiving / lifting device 4 include the load receiving platform (platform) 5, a slide drive unit 6 for sliding a unit including the load receiving stand 5 and the like in the front-rear direction, and the load receiving stand 5. Is provided with a lifting drive unit 7 that lifts and lowers.

スライド駆動部６は、前後方向に延設した左右一対のガイドレール８、それぞれ左右のガイドレール８に沿って走行可能な左右のスライダ９、これらスライダ９を連結する連結部材１０、連結部材１０におけるスライダ９の左右外側に設けた左右のブラケット１１、左右のスライダ９の後側にそれぞれ設けた支持フレーム１３、左右の支持フレーム１３の後端にそれぞれ設けた支持ローラ１２、及び左右のスライダ９をそれぞれ前後にスライドさせる左右一対の複動式のスライドシリンダ１４を備えている。スライドシリンダ１４の伸長動作に伴って格納状態の荷受台５を含むユニットがガイドレール８に沿って車両の後方側にスライドし、縮退動作に伴って荷受台５が車両の前方側にスライドし車両の下部空間に格納される。   The slide drive unit 6 includes a pair of left and right guide rails 8 extending in the front-rear direction, left and right sliders 9 that can travel along the left and right guide rails 8, a connecting member 10 that connects these sliders 9, and a connecting member 10. The left and right brackets 11 provided on the left and right outer sides of the slider 9, the support frames 13 provided on the rear sides of the left and right sliders 9, the support rollers 12 provided on the rear ends of the left and right support frames 13, and the left and right sliders 9, respectively. A pair of left and right double-acting slide cylinders 14 that slide back and forth are provided. As the slide cylinder 14 extends, the unit including the stowage 5 in the retracted state slides along the guide rail 8 toward the rear of the vehicle, and as the retracting operation occurs, the load receiving 5 slides toward the front of the vehicle. Is stored in the lower space.

ガイドレール８にはスライダ９の前後方向の移動範囲を制限するストッパ１５，１６（後述の図８〜図１４参照）が設けられている。後端側のストッパ１６には、このストッパ１６にスライダ９が当接した状態（以降、作業位置という）にあるかどうかを検出する後端センサ１７（後の図５参照）が設けられている。また、支持フレーム１３には折り畳まれた荷受台５が支持ローラ１２に当接しているかどうかを検出するゲートセンサ１８が設けられている。   The guide rail 8 is provided with stoppers 15 and 16 (see FIGS. 8 to 14 to be described later) for limiting the range of movement of the slider 9 in the front-rear direction. The stopper 16 on the rear end side is provided with a rear end sensor 17 (see FIG. 5 below) for detecting whether or not the slider 16 is in contact with the stopper 16 (hereinafter referred to as a working position). . The support frame 13 is provided with a gate sensor 18 that detects whether or not the folded load receiving platform 5 is in contact with the support roller 12.

昇降駆動部７は、上端部がブラケット１１に回動可能に支持された第１アーム（チルトアーム）１９、前端部が第１アーム１９に後端部が荷受台５にそれぞれ回動可能に連結された第２アーム２０、前端部がブラケット１１に後端部が荷受台５にそれぞれ回動可能に連結された第３アーム（コンプレッションアーム）２１、及び前端部が第１アーム１９の下端部に後端部が第２アーム２０にそれぞれ回動可能に連結された単動式のリフトシリンダ２２を備えている。第１アーム１９、第２アーム２０、第３アーム２１、及びリフトシリンダ２２はそれぞれ左右一対設けられている。第２及び第３アーム２０，２１が平行リンクを形成し、リフトシリンダ２２の伸縮に伴って昇降する荷受台５のほぼ水平の姿勢がチルト時（後述）を除いて常時保たれるようになっている。   The elevating drive unit 7 has a first arm (tilt arm) 19 whose upper end is rotatably supported by the bracket 11, a front end is connected to the first arm 19, and a rear end is rotatably connected to the load receiving platform 5. The second arm 20, the front end is connected to the bracket 11, the rear end is pivotally connected to the load receiving platform 5, and the front end is connected to the lower end of the first arm 19. A single-acting lift cylinder 22 whose rear end is rotatably connected to the second arm 20 is provided. A first arm 19, a second arm 20, a third arm 21, and a lift cylinder 22 are provided in pairs on the left and right. The second and third arms 20 and 21 form a parallel link, and the substantially horizontal posture of the load receiving platform 5 that moves up and down as the lift cylinder 22 expands and contracts is always maintained except during tilting (described later). ing.

荷受台５は、昇降駆動部７に支持された荷受台基端部２３、荷受台基端部２３にヒンジ２４を介して連結された荷受台本体部２５、荷受台本体部２５にヒンジ２６を介して連結された荷受台先端部２７で構成されている。ヒンジ２４は、両端が荷受台基端部２３及び荷受台本体部２５にそれぞれ回動可能に連結されており、荷受台基端部２３に対する荷受台本体部２５の回動機構がヒンジ２４を介する二重関節構造となっている。これと同様、荷受台本体部２５に対する荷受台先端部２７の回動機構がヒンジ２６を介する二重関節構造となっている。これにより、荷受台本体部２５及び荷受台先端部２７は、展開状態（図３）から上方に回動して図２のように折り畳み可能な構成である。図２及び図３には図示していないが、昇降駆動部７（例えば第２アーム２０）には格納時の格納姿勢の高さに荷受台５があるかどうかを荷受台５との距離で検出するアームセンサ２８が設けてある。   The load receiving platform 5 includes a load receiving platform base end portion 23 supported by the elevating drive unit 7, a load receiving platform main body portion 25 connected to the load receiving platform base end portion 23 via a hinge 24, and a hinge 26 to the load receiving platform main body portion 25. It is comprised by the load receiving stand front-end | tip part 27 connected via. Both ends of the hinge 24 are rotatably connected to the load receiving base end portion 23 and the load receiving base body portion 25, respectively, and the rotation mechanism of the load receiving base body portion 25 with respect to the load receiving base end portion 23 is provided via the hinge 24. It has a double joint structure. Similarly to this, the rotation mechanism of the load receiving table front end portion 27 with respect to the load receiving table main body portion 25 has a double joint structure through the hinge 26. Thereby, the load receiving base main body 25 and the load receiving stand front end 27 are configured to be pivotable upward from the unfolded state (FIG. 3) and folded as shown in FIG. Although not shown in FIGS. 2 and 3, whether or not the elevation driving unit 7 (for example, the second arm 20) has the load receiving platform 5 at the height of the storage posture at the time of storage is determined by the distance from the load receiving platform 5. An arm sensor 28 for detection is provided.

前述したスライド駆動部６の連結部材１０の左右両端部には、荷受台昇降装置４を操作する操作部３４、及び上記シリンダ１４，２２を駆動するための次の図４に示す油圧駆動装置（パワーユニット）３３がそれぞれ設けられている。   At the left and right ends of the connecting member 10 of the slide drive unit 6 described above, an operation unit 34 for operating the load receiving platform lifting device 4 and a hydraulic drive device (shown in FIG. 4) for driving the cylinders 14 and 22 ( Power unit) 33 is provided.

図４は油圧駆動装置３３の一構成例を表す油圧回路図である。
図４に示す油圧駆動装置３３は、電動モータ（原動機）３６、電動モータ３６によって駆動され圧油を吐出する油圧ポンプ３７、油圧ポンプ３７の吸込側に設けた作動油タンク３８、油圧ポンプ３７から吐出される圧油をリフトシリンダ２２のボトム側に供給する圧油供給管路３９、この圧油供給管路３９の圧油の流れの連通・遮断状態を切り換えるリフトシリンダ伸長動作用のコントロールバルブ４０、圧油供給管路３９における伸長動作用コントロールバルブ４０の下流側で分岐されて作動油タンク３８に連通しリフトシリンダ２２のボトム側からの戻り油を作動油タンク３８に戻す圧油排出管路４１、この圧油排出管路４１の圧油の流れの連通・遮断状態を切り換えるリフトシリンダ２２の縮退動作用コントロールバルブ４２、この縮退動作用コントロールバルブ４２の下流側に設けた流量制御弁４３、及び油圧ポンプ３７の吐出圧の最大値を規定するためのリリーフ弁４４を備えている。 FIG. 4 is a hydraulic circuit diagram illustrating a configuration example of the hydraulic drive device 33.
4 includes an electric motor (prime mover) 36, a hydraulic pump 37 that is driven by the electric motor 36 and discharges pressure oil, a hydraulic oil tank 38 provided on the suction side of the hydraulic pump 37, and the hydraulic pump 37. A pressure oil supply pipe 39 for supplying the discharged pressure oil to the bottom side of the lift cylinder 22, and a control valve 40 for lift cylinder extension operation for switching the communication / blocking state of the flow of pressure oil in the pressure oil supply pipe 39. The pressure oil discharge line 39 is branched downstream of the control valve 40 for extension operation in the pressure oil supply line 39, communicates with the hydraulic oil tank 38, and returns the return oil from the bottom side of the lift cylinder 22 to the hydraulic oil tank 38. 41, a control valve 42 for contraction operation of the lift cylinder 22 for switching the communication / blocking state of the pressure oil flow in the pressure oil discharge pipe 41, And a relief valve 44 for specifying the maximum value of the discharge pressure of the flow control valve 43 and the hydraulic pump 37, is provided on the downstream side of the operation control valve 42.

電動モータ３６の駆動時（油圧ポンプ３７の駆動時）、伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに駆動指令信号が入力されると、伸長動作用コントロールバルブ４０が図４中左側の連通位置に切り換えられ、リフトシリンダ２２のボトム側と油圧ポンプ３７とが圧油供給管路３９を介して接続される。このとき、縮退動作用コントロールバルブ４２が図４中下側の遮断位置であると、油圧ポンプ３７から吐出された圧油が圧油供給管路３９を介しリフトシリンダ２２のボトム側に供給され、リフトシリンダ２２が伸長方向に駆動し、その結果、荷受台５が上昇する。   When the electric motor 36 is driven (when the hydraulic pump 37 is driven), when a drive command signal is input to the solenoid drive unit 40a of the extension operation control valve 40, the extension operation control valve 40 is connected to the left communication position in FIG. And the bottom side of the lift cylinder 22 and the hydraulic pump 37 are connected via a pressure oil supply line 39. At this time, if the control valve 42 for the retracting operation is in the lower cutoff position in FIG. 4, the pressure oil discharged from the hydraulic pump 37 is supplied to the bottom side of the lift cylinder 22 via the pressure oil supply line 39. The lift cylinder 22 is driven in the extending direction, and as a result, the load receiving platform 5 is raised.

一方、縮退動作用コントロールバルブ４２のソレノイド駆動部４２ａに駆動指令信号が入力されると、縮退動作用コントロールバルブ４２が図４中上側の連通位置に切り換えられ、リフトシリンダ２２のボトム側と作動油タンク３８とが圧油排出管路４１を介して接続される。このとき、荷受台５等の自重によってリフトシリンダ２２のロッドに縮退動作側に力が加わり、タンク圧のリフトシリンダ２２のボトム側から圧油が押し退けられ、リフトシリンダ２２が縮退方向に動作する。リフトシリンダ２２のボトム側からの戻り油は圧油排出管路４１を介し作動油タンク３８に流出し、その結果、荷受台５が下降するようになっている。なお、その際、電動モータ３６及び油圧ポンプ３７は駆動停止していても良い。また、またこの場合には、本実施の形態では伸長動作用コントロールバルブ４０が図４中右側の遮断位置に切り換えられるが、要はリフトシリンダ２２のボトム側がタンク圧になればリフトシリンダ２２は縮退するので、伸長動作用コントロールバルブ４０は連通位置のままであっても構わない。   On the other hand, when a drive command signal is input to the solenoid drive unit 42a of the retracting operation control valve 42, the retracting operation control valve 42 is switched to the upper communication position in FIG. A tank 38 is connected via a pressure oil discharge pipe 41. At this time, force is applied to the rod of the lift cylinder 22 by the dead weight of the load receiving platform 5 and the like, and the pressure oil is pushed away from the bottom side of the lift cylinder 22 of the tank pressure, and the lift cylinder 22 operates in the retracting direction. The return oil from the bottom side of the lift cylinder 22 flows out to the hydraulic oil tank 38 via the pressure oil discharge pipe 41, and as a result, the load receiving platform 5 is lowered. At that time, the electric motor 36 and the hydraulic pump 37 may be stopped. Further, in this case, in the present embodiment, the extension operation control valve 40 is switched to the shut-off position on the right side in FIG. 4. In short, the lift cylinder 22 is retracted if the bottom side of the lift cylinder 22 reaches the tank pressure. Therefore, the extension operation control valve 40 may remain in the communication position.

また、油圧駆動装置３３は、圧油供給管路３９におけるリフトシリンダ２２の伸長動作用コントロールバルブ４０の上流側で分岐され、スライドシリンダ１４のロッド側に圧油を供給するための圧油供給管路４６、このロッド側への圧油供給管路４６における絞り弁４７及び逆止弁４８の下流側で分岐され、スライドシリンダ１４のボトム側に圧油を供給するための圧油供給管路４９、このボトム側への圧油供給管路４９に設けられ、油圧ポンプ３７とスライドシリンダ１４のボトム側との連通・遮断状態を切り換える伸長動作用コントロールバルブ５０、伸長動作用コントロールバルブ５０の下流側の位置で圧油供給管路４９から分岐され作動油タンク３８に接続された圧油排出管路５１、及びこの圧油排出管路５１に設けられ、スライドシリンダ１４のボトム側と作動油タンク３８との連通・遮断状態を切り換える縮退動作用コントロールバルブ５２を備えている。   The hydraulic drive device 33 is branched on the upstream side of the control valve 40 for the extension operation of the lift cylinder 22 in the pressure oil supply line 39, and a pressure oil supply pipe for supplying pressure oil to the rod side of the slide cylinder 14. A pressure oil supply line 49 for branching downstream of the throttle valve 47 and the check valve 48 in the pressure oil supply line 46 to the rod side and supplying pressure oil to the bottom side of the slide cylinder 14. The control valve 50 for extension operation, which is provided in the pressure oil supply pipe 49 to the bottom side, and switches the communication state between the hydraulic pump 37 and the bottom side of the slide cylinder 14 and the downstream side of the control valve 50 for extension operation. The pressure oil discharge pipe 51 branched from the pressure oil supply pipe 49 at the position and connected to the hydraulic oil tank 38, and the pressure oil discharge pipe 51 are provided and slides. And a compressing operation control valve 52 for switching communication and cut-off state between the bottom side and the hydraulic oil tank 38 Linda 14.

スライドシリンダ１４を伸長させる場合、電動モータ３６及び油圧ポンプ３７の駆動時、伸長動作用コントロールバルブ５０のソレノイド駆動部５０ａに駆動指令信号を出力し、伸長動作用コントロールバルブ５０を図４中の上側の連通位置に切り換え、スライドシリンダ１４のボトム側と油圧ポンプ３８とを連通させる。その際、縮退動作用コントロールバルブ５２が図４中の下側の遮断位置であれば、圧油供給管路４６，４９を介してスライドシリンダ１４のロッド側及びボトム側の双方に圧油が供給されるが、受圧面積差によりボトム側からロッドを押す力が勝り、油圧ポンプ３７から吐出された圧油はスライドシリンダ１４のロッド側からの戻り油とともに圧油供給管路４９を介してボトム側に供給される。その結果、スライドシリンダ１４が伸長方向に駆動し、荷受台５等が後方にスライドする。   When the slide cylinder 14 is extended, when the electric motor 36 and the hydraulic pump 37 are driven, a drive command signal is output to the solenoid drive unit 50a of the extension operation control valve 50, and the extension operation control valve 50 is moved to the upper side in FIG. To the communication position, the bottom side of the slide cylinder 14 and the hydraulic pump 38 are communicated. At that time, if the control valve 52 for the retracting operation is in the lower cutoff position in FIG. 4, the pressure oil is supplied to both the rod side and the bottom side of the slide cylinder 14 via the pressure oil supply pipes 46 and 49. However, the force to push the rod from the bottom side is superior due to the pressure receiving area difference, and the pressure oil discharged from the hydraulic pump 37 is returned to the bottom side via the pressure oil supply line 49 together with the return oil from the rod side of the slide cylinder 14. To be supplied. As a result, the slide cylinder 14 is driven in the extending direction, and the load receiving platform 5 and the like slide backward.

一方、スライドシリンダ１４を縮退させる場合、電動モータ３６及び油圧ポンプ３７の駆動時、縮退動作用コントロールバルブ５２のソレノイド駆動部５２ａに駆動指令信号を出力し、縮退動作用コントロールバルブ５２を図４中の上側の連通位置に切り換え、スライドシリンダ１４のボトム側と作動油タンク３８とを連通させる。その際、伸長動作用コントロールバルブ５０が図４中の下側の遮断位置であれば、スライドシリンダ１４のボトム側に圧油を供給する圧油供給管路４９が遮断され、なおかつ圧油供給管路４９が圧油排出管路５１を介して作動油タンク３８に連通する。よって油圧ポンプ３７から吐出された圧油が圧油供給管路４６を介しスライドシリンダ１４のロッド側に供給され、ボトム側からの戻り油が圧油排出管路５１を介し作動油タンク３８に戻る。その結果、スライドシリンダ１４が縮退方向に駆動し、荷受台５等が前方にスライドする。   On the other hand, when the slide cylinder 14 is retracted, when the electric motor 36 and the hydraulic pump 37 are driven, a drive command signal is output to the solenoid driving part 52a of the retracting operation control valve 52, and the retracting operation control valve 52 is shown in FIG. To the upper communication position, the bottom side of the slide cylinder 14 and the hydraulic oil tank 38 are communicated. At this time, if the extension operation control valve 50 is in the lower cutoff position in FIG. 4, the pressure oil supply pipe 49 that supplies pressure oil to the bottom side of the slide cylinder 14 is shut off, and the pressure oil supply pipe The passage 49 communicates with the hydraulic oil tank 38 via the pressure oil discharge pipe 51. Accordingly, the pressure oil discharged from the hydraulic pump 37 is supplied to the rod side of the slide cylinder 14 via the pressure oil supply line 46, and the return oil from the bottom side returns to the hydraulic oil tank 38 via the pressure oil discharge line 51. . As a result, the slide cylinder 14 is driven in the retracting direction, and the load receiving platform 5 and the like slide forward.

なお、荷受台５の昇降時においては、スライドシリンダ１４は閉回路状態として保持しておいても良いが、昇降動作の基部となるスライダ９の位置をしっかりと固定するために、伸長動作用コントロールバルブ５０を連通位置のままにしてスライドシリンダ１４のロッドを伸長方向に付勢し、スライダ９が上記した後端側ストッパ１６に押し付けられるようにしても良い。   The slide cylinder 14 may be held in a closed circuit state when the load receiving platform 5 is raised or lowered. However, in order to firmly fix the position of the slider 9 serving as the base of the raising and lowering operation, the extension operation control is performed. The slider 50 may be pressed against the rear end side stopper 16 by urging the rod of the slide cylinder 14 in the extending direction while keeping the valve 50 in the communicating position.

図５及び図６は上記格納式荷受台昇降装置４の駆動制御に関する要部構成を表す電気回路図である。
図５及び図６に示す電気回路は、前述した電動モータ３６、センサ１７，１８，２８、各コントロールバルブ４０，４２，５０，５２のソレノイド駆動部４０ａ，４２ａ，５０ａ，５２ａの他、格納式荷受台昇降装置４の主電源スイッチ６０、主電源のＯＮ／ＯＦＦを表示する電源ランプ６１、ソレノイド駆動部４０ａ，４２ａ，５０ａ，５２ａへの駆動指令信号（通電）のＯＮ／ＯＦＦを操作する操作スイッチ６２，６３、リレーコイルＲ１〜Ｒ４，ＲＡ，ＲＢ，Ｔ１，Ｔ２，ＣＴ、及びこれらリレーコイルＲ１〜Ｒ４，ＲＡ，ＲＢ，Ｔ１，Ｔ２，ＣＴが励磁されるとそれぞれ作動するリレー接点Ｒ１’〜Ｒ４’，ＲＡ’，ＲＢ’，Ｔ１’，Ｔ２’，ＣＴ’を備えている。 FIGS. 5 and 6 are electric circuit diagrams showing the configuration of the main part relating to the drive control of the retractable load receiving table elevating device 4.
The electric circuit shown in FIGS. 5 and 6 includes a retractable type in addition to the electric motor 36, the sensors 17, 18, and 28, the solenoid driving portions 40a, 42a, 50a, and 52a of the control valves 40, 42, 50, and 52 described above. Operation for operating ON / OFF of a main power switch 60 of the load receiving platform elevating device 4, a power lamp 61 for displaying ON / OFF of the main power, and a drive command signal (energization) to the solenoid drive units 40a, 42a, 50a, 52a. Switches 62 and 63, relay coils R1 to R4, RA, RB, T1, T2, and CT, and relay contacts R1 ′ that operate when these relay coils R1 to R4, RA, RB, T1, T2, and CT are excited, respectively. ˜R4 ′, RA ′, RB ′, T1 ′, T2 ′, CT ′.

上記リレー接点Ｒ３’，Ｒ４’は重複型の接点で、２つの接点のうちのいずれか一方がＯＮで他方がＯＦＦとなるもので、それぞれリレーコイルＲ３，Ｒ４が励磁されると２つの接点のＯＮ／ＯＦＦが切り換わる。またリレーコイルＴ１，Ｔ２はオンディレータイマのコイルで、励磁状態が設定時間継続すると励磁開始から設定時間経過後に対応のオンディレータイマ接点Ｔ１’，Ｔ２’が作動する。なお、主電源スイッチ６０、電源ランプ６１、及び操作スイッチ６２，６３は例えば操作部３４（図２又は図３参照）や荷台３内のリモコン等に配置されている。   The relay contacts R3 ′ and R4 ′ are overlapping contacts, and one of the two contacts is ON and the other is OFF. When the relay coils R3 and R4 are excited, the two contacts ON / OFF is switched. The relay coils T1 and T2 are on-delay timer coils. When the excitation state continues for a set time, the corresponding on-delay timer contacts T1 'and T2' are activated after the set time has elapsed from the start of excitation. The main power switch 60, the power lamp 61, and the operation switches 62 and 63 are disposed, for example, on the operation unit 34 (see FIG. 2 or FIG. 3), the remote controller in the loading platform 3, and the like.

回路の動作は後述するが、図５に示した電気回路は、上記コントロールバルブ４０，４２，５０，５２の各ソレノイド駆動部４０ａ，４２ａ，５０ａ，５２ａや電動モータ３６等への駆動指令信号を出力し格納式荷受台昇降装置４を駆動制御する役割を果たす。   Although the operation of the circuit will be described later, the electric circuit shown in FIG. 5 sends drive command signals to the solenoid drive units 40a, 42a, 50a, 52a of the control valves 40, 42, 50, 52, the electric motor 36, and the like. It outputs and plays a role of driving and controlling the retractable cradle lifting device 4.

同時に、本実施の形態において、この電気回路は、スライドシリンダ１４の縮退初動時にスライドシリンダ１４の保持圧を開放する保持圧開放手段としても機能する。この点についても詳細は後述するが、この電気回路によって、図７に示すように、荷受台５の格納動作時、荷受台５の上昇動作開始時刻ｔ１において連通位置にある伸長動作用コントロールバルブ５０は、スライドシリンダ１４の縮退動作用コントロールバルブ５２が連通位置に切り換わってから（時刻ｔ２から）設定時間Δｔ（＝ｔ３−ｔ２）が経過するまで連通位置に保持され圧油供給管路３９，４６，４９が作動油タンク３８に連通する。これにより縮退動作の初動時に設定時間Δｔの間だけスライドシリンダ１４の保持圧が開放され、縮退動作用コントロールバルブ５２が連通位置に切り換わってから設定時間Δｔが経過後（時刻ｔ３）に伸長動作用コントロールバルブ５０が遮断位置に切り換えられる。その結果、スライド初動時、スライドシリンダ１４の縮退動作を指令信号が出力されても、設定時間Δｔの間はスライドシリンダ１４が非駆動状態となり、設定時間Δｔの経過時（時刻ｔ３）にスライドシリンダ１４の縮退動作がスタートする、すなわち荷受台５のスライド開始時刻が設定時間Δｔだけ遅れるようになっている。   At the same time, in the present embodiment, this electric circuit also functions as a holding pressure releasing means for releasing the holding pressure of the slide cylinder 14 when the slide cylinder 14 is initially retracted. Although this point will also be described in detail later, as shown in FIG. 7, this electric circuit causes the extension operation control valve 50 that is in the communication position at the time of the lift operation start time t <b> 1 of the load receiving table 5 to be stored. Is held at the communication position until the set time Δt (= t3−t2) elapses (from time t2) after the control valve 52 for retracting the slide cylinder 14 is switched to the communication position. 46 and 49 communicate with the hydraulic oil tank 38. As a result, the holding pressure of the slide cylinder 14 is released only for the set time Δt at the initial operation of the retracting operation, and the extending operation is performed after the set time Δt has elapsed (time t3) after the retracting operation control valve 52 is switched to the communication position. Control valve 50 is switched to the blocking position. As a result, even when a command signal is output for the retracting operation of the slide cylinder 14 during the initial movement of the slide, the slide cylinder 14 is not driven during the set time Δt, and the slide cylinder is reached when the set time Δt has elapsed (time t3). 14 is started, that is, the slide start time of the receiving platform 5 is delayed by a set time Δt.

次に、図４〜図６に加えて図８〜図１４を参照することにより本実施の形態の格納式荷受台昇降装置４の動作及び作用効果を説明する。なお、図８〜図１４では操作部３４を図示省略してある。   Next, operations and effects of the retractable load receiving table lifting / lowering device 4 according to the present embodiment will be described with reference to FIGS. 8 to 14 in addition to FIGS. 4 to 6. 8 to 14, the operation unit 34 is not shown.

（１）荷受台の展開動作
まず、荷受台５を図８に示す格納状態から図１２に示す作業状態に移行させる荷受台展開時の動作について説明する。図８のように荷受台５が格納姿勢にあるとき、主電源スイッチ６０をＯＮにすると電源ランプ６１が点灯する。その上で操作スイッチ６３をＯＮにすると、重複型リレー接点Ｒ３’のＮＣ（ノーマルクローズ）側接点を介してスライドシリンダ１４の伸長動作用コントロールバルブ５０のソレノイド駆動部５０ａに通電されソレノイド駆動部５０ａが連通位置に切り換わる。またソレノイド駆動部５０ａに通電されると同時に、矢印Ａ３で示した回路に通電され、リレーコイルＣＴ，Ｔ１（図６参照）が励磁される。これによりリレー接点ＣＴ’が閉じ電動モータ３６が駆動する。その結果、油圧ポンプ３７からの圧油がスライドシリンダ１４のボトム側に供給されてスライドシリンダ１４が伸長方向に駆動する。 (1) Unloading operation of the load receiving table First, the operation at the time of unloading the load receiving table for shifting the receiving table 5 from the storage state shown in FIG. 8 to the working state shown in FIG. 12 will be described. When the main power switch 60 is turned on when the cargo receiving platform 5 is in the retracted position as shown in FIG. 8, the power lamp 61 is lit. Then, when the operation switch 63 is turned ON, the solenoid drive unit 50a of the control valve 50 for the extension operation of the slide cylinder 14 is energized through the NC (normally closed) side contact of the overlapping relay contact R3 ′, and the solenoid drive unit 50a. Switches to the communication position. At the same time as the solenoid drive unit 50a is energized, the circuit indicated by the arrow A3 is energized, and the relay coils CT and T1 (see FIG. 6) are excited. As a result, the relay contact CT ′ is closed and the electric motor 36 is driven. As a result, the pressure oil from the hydraulic pump 37 is supplied to the bottom side of the slide cylinder 14 and the slide cylinder 14 is driven in the extending direction.

スライドシリンダ１４が伸長して図９のようにスライダ９が後端側ストッパ１６に当接し、そのことが後端センサ１７に検出され後端センサ１７がＯＮになると、図５においてリレーコイルＲ３に通電する回路が開きリレーコイルＲ３が励磁され、重複型のリレー接点Ｒ３’がＮＯ（ノーマルオープン）側接点に切り換わる。リレー接点Ｒ３’が切り換わってリフトシリンダ２２の縮退動作用コントロールバルブ４２のソレノイド駆動部４２ａに通電されると、図６に示す回路への通電が遮断されてリレーコイルＣＴの励磁状態が解かれる。そして、リレー接点ＣＴ’が開き電動モータ３６が停止する。これにより油圧ポンプ３７が停止し、なおかつリフトシリンダ２２のボトム側がタンク圧になることからリフトシリンダ２２の保持圧が開放され、荷受台５やアーム１９〜２１等の重みによってリフトシリンダ２２が縮退し、リフトシリンダ２２の縮退時に押し退けられた戻り油は作動油タンク３８に戻される。その結果、荷受台基端部２３が下降し、荷受台本体部２５及び荷受台先端部２７は支持ローラ１２に倣って荷受台基端部２３に対し回動する。そして、図１０に示したように荷受台基端部２３が接地し、荷受台本体部２５及び荷受台先端部２７が支持ローラ１２に立て掛けられるように起立した状態となる。   When the slide cylinder 14 extends and the slider 9 comes into contact with the rear end side stopper 16 as shown in FIG. 9 and this is detected by the rear end sensor 17 and the rear end sensor 17 is turned ON, the relay coil R3 in FIG. The energized circuit is opened, the relay coil R3 is excited, and the overlapping relay contact R3 ′ is switched to the NO (normally open) side contact. When the relay contact R3 ′ is switched and the solenoid drive part 42a of the control valve 42 for the retracting operation of the lift cylinder 22 is energized, the energization to the circuit shown in FIG. 6 is interrupted and the excitation state of the relay coil CT is released. . Then, the relay contact CT 'is opened and the electric motor 36 is stopped. As a result, the hydraulic pump 37 stops and the bottom side of the lift cylinder 22 becomes the tank pressure, so that the holding pressure of the lift cylinder 22 is released, and the lift cylinder 22 is degenerated by the weight of the load receiving platform 5 and the arms 19 to 21. The return oil pushed away when the lift cylinder 22 is retracted is returned to the hydraulic oil tank 38. As a result, the load receiving base end portion 23 is lowered, and the load receiving stand main body portion 25 and the load receiving stand distal end portion 27 are rotated with respect to the load receiving stand base end portion 23 along the support roller 12. Then, as shown in FIG. 10, the load receiving base end portion 23 is grounded, and the load receiving base main body portion 25 and the load receiving stand distal end portion 27 stand up so as to lean against the support roller 12.

荷受台５が図１０のような姿勢になったら、操作者は折り畳まれた状態の荷受台５を展開する。この場合、まず荷受台本体部２５に設けた図示しないグリップを引き、荷受台本体部２５を略水平状態に展開する（図１１参照）。続いて、荷受台先端部２７に設けた図示しないグリップを引き、荷受台先端部２７を略水平状態に展開する（図１２参照）。   When the load receiving stand 5 is in the posture as shown in FIG. 10, the operator unfolds the load receiving stand 5 in a folded state. In this case, first, a grip (not shown) provided on the load receiving table main body 25 is pulled to expand the load receiving main body 25 in a substantially horizontal state (see FIG. 11). Subsequently, a grip (not shown) provided at the tip of the cargo cradle 27 is pulled to expand the tip of the cargo cradle 27 in a substantially horizontal state (see FIG. 12).

（２）荷受台昇降（作業支援）動作
次に図１２〜図１４を用いて格納式荷受台昇降装置４における荷受台５の作業時の昇降動作について説明する。荷受台５を展開した後、操作スイッチ６２を押すと、重複型リレー接点Ｒ４’のＮＣ側接点を介してリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに通電されソレノイド駆動部４０ａが連通位置に切り換わる。またソレノイド駆動部４０ａに通電されると同時に、矢印Ａ１で示した回路に通電され、リレーコイルＣＴ，Ｔ１（図６参照）が励磁される。これによりリレー接点ＣＴ’が閉じ電動モータ３６が駆動する。その結果、油圧ポンプ３７からの圧油がリフトシリンダ２２のボトム側に供給されてリフトシリンダ２２が伸長方向に駆動し、図１４に示すように荷受台５を車両の荷台３の床面高さまで上昇させることができる。 (2) Elevating / lowering operation (work support) operation Next, an elevating operation during the operation of the load receiving platform 5 in the retractable load receiving device elevating device 4 will be described with reference to FIGS. When the operation switch 62 is pushed after the load receiving platform 5 is deployed, the solenoid drive unit 40a of the control valve 40 for the extension operation of the lift cylinder 22 is energized via the NC side contact of the overlapping relay contact R4 ′. Switches to the communication position. At the same time as the solenoid drive unit 40a is energized, the circuit indicated by the arrow A1 is energized, and the relay coils CT and T1 (see FIG. 6) are excited. As a result, the relay contact CT ′ is closed and the electric motor 36 is driven. As a result, the pressure oil from the hydraulic pump 37 is supplied to the bottom side of the lift cylinder 22 and the lift cylinder 22 is driven in the extending direction, and the load receiving platform 5 is brought to the floor surface height of the vehicle loading platform 3 as shown in FIG. Can be raised.

このとき、リフトシリンダ２２の伸長指令側のソレノイド駆動部４０ａとともにスライドシリンダ１４の伸長指令側のソレノイド駆動部５０ａにも通電されるので、スライドシリンダ１４の伸長動作用コントロールバルブ５０が連通位置となりスライドシリンダ１４は伸長方向に付勢され、荷受台５の上昇時は常にスライダ９が後端側ストッパ１６に押し付けられた状態となる。   At this time, since the solenoid driving unit 40a on the extension command side of the lift cylinder 22 and the solenoid driving unit 50a on the extension command side of the slide cylinder 14 are energized, the control valve 50 for the extension operation of the slide cylinder 14 becomes the communication position and slides. The cylinder 14 is biased in the extending direction, and the slider 9 is always pressed against the rear end side stopper 16 when the load receiving platform 5 is raised.

一方、荷受台５を下降させるときには、操作スイッチ６３を操作する。荷受台５を展開するときにリレー接点Ｒ３’が図５の状態からＮＯ側接点に切り換わっているので、操作スイッチ６３を押すと、リレー接点Ｒ３’のＮＯ側接点を介してリフトシリンダ２２の縮退動作用コントロールバルブ４２のソレノイド駆動部４２ａに通電され、図６に示す回路への通電が遮断されてリレーコイルＣＴの励磁状態が解かれる。するとリレー接点ＣＴ’が開き電動モータ３６が停止する。これにより油圧ポンプ３７が停止し、リフトシリンダ２２の保持圧が開放され、荷受台５やアーム１９〜２１、或いは荷受台５上の作業車や荷物等の重みによって荷受台５が下降する。リフトシリンダ２２の縮退時にボトム側から押し退けられた戻り油は作動油タンク３８に戻される。   On the other hand, when the cargo receiving platform 5 is lowered, the operation switch 63 is operated. Since the relay contact R3 ′ is switched from the state shown in FIG. 5 to the NO-side contact when the load receiving platform 5 is deployed, when the operation switch 63 is pressed, the lift cylinder 22 is connected via the NO-side contact of the relay contact R3 ′. The solenoid drive part 42a of the degeneration operation control valve 42 is energized, the energization to the circuit shown in FIG. 6 is interrupted, and the excitation state of the relay coil CT is released. Then, the relay contact CT 'is opened and the electric motor 36 is stopped. As a result, the hydraulic pump 37 is stopped, the holding pressure of the lift cylinder 22 is released, and the load receiving platform 5 is lowered by the weight of the load receiving platform 5, the arms 19 to 21, or the work vehicle, luggage, etc. on the load receiving platform 5. The return oil pushed away from the bottom side when the lift cylinder 22 is retracted is returned to the hydraulic oil tank 38.

なお、図１２に示すように荷受台基端部２３が接地した状態まで荷受台５を下降させ、この状態でさらに操作スイッチ６３を押すと、荷受台基端部２３が接地した状態でリフトシリンダ２２が縮退する結果、第１アーム（チルトアーム）１９が回動して平行リンクの平行四辺形の頂点位置が崩れる。するとほぼ水平の姿勢を保っていた荷受台５が後方に向かって下り傾斜の姿勢に移行（チルト）し、図１３に示すように荷受台先端部２７の先端側が地面に近接することにより、台車等を荷受台５上に積載し易くなる。   As shown in FIG. 12, when the load receiving base 5 is lowered until the load receiving base end 23 is grounded, and the operation switch 63 is further pressed in this state, the lift cylinder As a result of the 22 being degenerated, the first arm (tilt arm) 19 rotates and the parallelogram apex position of the parallel link collapses. Then, the load receiving platform 5 that has maintained a substantially horizontal posture shifts downward (tilt) toward the rear, and as shown in FIG. Etc. can be easily loaded on the receiving tray 5.

また、荷受台５を下降させるとき、電動モータ３６は停止するが、前述したようにスライドシリンダ１４が閉回路となるため、スライダ９が後端側ストッパ１６に当接した状態が保たれる。   Further, when the load receiving platform 5 is lowered, the electric motor 36 is stopped. However, since the slide cylinder 14 becomes a closed circuit as described above, the state where the slider 9 is in contact with the rear end side stopper 16 is maintained.

また、本実施の形態においては、電動モータ３６の焼き付き防止のために、一定時間以上電動モータ３６の駆動状態が継続すると電動モータ３６が停止する。例えば操作スイッチ６２が一定時間（例えば２０秒程度）押し続けられると、図６に示すタイマリレーコイルＴ１の励磁状態が一定時間継続し、タイマリレー接点Ｔ１’がＯＮになり、リレーコイルＲＢに通電されてコイルＲＢが励磁されてリレー接点ＲＢ’が開く。その結果、リレーコイルＣＴの励磁状態が解かれ、リレー接点ＣＴ’が開き、電動モータ３６が停止する。   In the present embodiment, in order to prevent burn-in of the electric motor 36, the electric motor 36 is stopped when the driving state of the electric motor 36 is continued for a predetermined time or more. For example, when the operation switch 62 is kept pressed for a certain period of time (for example, about 20 seconds), the excitation state of the timer relay coil T1 shown in FIG. 6 continues for a certain period of time, the timer relay contact T1 ′ is turned on, and the relay coil RB is energized. Then, the coil RB is excited and the relay contact RB ′ is opened. As a result, the excitation state of the relay coil CT is released, the relay contact CT 'is opened, and the electric motor 36 is stopped.

（３）荷受台の格納動作
次に荷受台５を例えば図１２に示す姿勢から図８に示す格納姿勢に移行させる荷受台格納時の動作について説明する。この場合、まず荷受台５を展開するときの図１０〜図１２の手順と逆の手順で展開状態の荷受台５を折り畳み、荷受台本体部２５及び荷受台先端部２７を支持ローラ１２に立て掛ける（図１０参照）。これにより立て掛けられた荷受台５が前述したゲートセンサ１８（図３も参照）に近接する。するとゲートセンサ１８がＯＮになり、荷受台５が折り畳まれて格納準備がなされたことが検出されると、リレーコイルＲ１に通電されリレー接点Ｒ１’が閉じる。 (3) Storage operation of load receiving table Next, an operation at the time of storing the load receiving table in which the load receiving table 5 is shifted from the posture shown in FIG. 12 to the storage posture shown in FIG. In this case, first, the unfolded load receiving platform 5 is folded in a procedure reverse to the procedure of FIGS. 10 to 12 when the load receiving platform 5 is deployed, and the load receiving platform main body 25 and the load receiving platform tip 27 are leaned against the support roller 12. (See FIG. 10). As a result, the stowage receiving stand 5 is brought close to the gate sensor 18 (see also FIG. 3). Then, the gate sensor 18 is turned on, and when it is detected that the cargo receiving platform 5 is folded and ready for storage, the relay coil R1 is energized and the relay contact R1 ′ is closed.

この状態で操作スイッチ６２を押すと、重複型リレー接点Ｒ４’のＮＣ側接点を介してリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに通電されソレノイド駆動部４０ａが連通位置に切り換わる。またソレノイド駆動部４０ａに通電されると同時に、矢印Ａ１で示した回路に通電され、リレーコイルＣＴ，Ｔ１（図６参照）が励磁される。これによりリレー接点ＣＴ’が閉じ電動モータ３６が駆動する。その結果、油圧ポンプ３７からの圧油がリフトシリンダ２２のボトム側に供給されてリフトシリンダ２２が伸長方向に駆動し、昇降駆動部７が上方に回動するとともに支持ローラ１２に預けられた荷受台５の姿勢が徐々に水平に寝ていく。そして図９の状態まで昇降駆動部７が回動して荷受台５がほぼ水平になると、前述したアームセンサ２８に荷受台５が近接し、アームセンサ２８がＯＮになる。すると、リレーコイルＲ２が励磁されてリレー接点Ｒ２’が閉じ、リレーコイルＲ４が励磁されて重複型のリレー接点Ｒ４’が図５の状態からＮＯ側接点に切り換わる。   When the operation switch 62 is pressed in this state, the solenoid drive unit 40a of the control valve 40 for the extension operation of the lift cylinder 22 is energized through the NC side contact of the overlapping relay contact R4 ′, and the solenoid drive unit 40a is switched to the communication position. Change. At the same time as the solenoid drive unit 40a is energized, the circuit indicated by the arrow A1 is energized, and the relay coils CT and T1 (see FIG. 6) are excited. As a result, the relay contact CT 'is closed and the electric motor 36 is driven. As a result, the pressure oil from the hydraulic pump 37 is supplied to the bottom side of the lift cylinder 22, the lift cylinder 22 is driven in the extending direction, the elevating drive unit 7 rotates upward, and the consignment received by the support roller 12. The posture of the table 5 gradually goes to sleep horizontally. When the elevating drive unit 7 is rotated to the state shown in FIG. 9 and the load receiving platform 5 becomes almost horizontal, the load receiving platform 5 comes close to the arm sensor 28 described above, and the arm sensor 28 is turned on. Then, the relay coil R2 is excited to close the relay contact R2 ', and the relay coil R4 is excited to switch the overlapping relay contact R4' from the state of FIG. 5 to the NO side contact.

さらに操作スイッチ６２を押し続けると、重複型リレー接点Ｒ４’のＮＯ側接点を介してスライドシリンダ１４の縮退動作用コントロールバルブ５２のソレノイド駆動部５２ａに通電されソレノイド駆動部５２ａが連通位置に切り換わる。またソレノイド駆動部５０ａに通電されると同時に、矢印Ａ２で示した回路に通電されリレーコイルＣＴ，Ｔ１（図６参照）が励磁される。これによりリレー接点ＣＴ’の閉じ状態が維持され電動モータ３６が引き続き駆動する。その結果、油圧ポンプ３７からの圧油がスライドシリンダ１４のロッド側に供給されてスライドシリンダ１４が縮退方向に駆動しようとする。   If the operation switch 62 is further pressed, the solenoid drive part 52a of the control valve 52 for the retracting operation of the slide cylinder 14 is energized via the NO side contact of the overlapping relay contact R4 ′, and the solenoid drive part 52a is switched to the communication position. . At the same time as the solenoid drive unit 50a is energized, the circuit indicated by the arrow A2 is energized to excite the relay coils CT and T1 (see FIG. 6). Thereby, the closed state of the relay contact CT 'is maintained and the electric motor 36 is continuously driven. As a result, the pressure oil from the hydraulic pump 37 is supplied to the rod side of the slide cylinder 14 and the slide cylinder 14 tries to drive in the retracting direction.

このとき、スライドシリンダ１４への縮退指令時にリレー接点ＲＡ’を介してタイマリレーＴ２にも通電される。図７に示すように時刻ｔ１に開始した荷受台５の上昇動作が時刻ｔ２に完了する場合、時刻ｔ２からスライドシリンダ１４の縮退動作側のソレノイド駆動部５２ａに指令信号が出力され、縮退動作用コントロールバルブ５２が連通位置に切り換わり、スライドシリンダ１４のボトム側の圧油供給管路４９が作動油タンク３８に連通する。本実施の形態では、縮退指令側のソレノイド駆動部５２ａに通電された後も引き続き、スライドシリンダ１４の伸長動作側のソレノイド駆動部５０ａへの指令信号が出力され、伸長動作用コントロールバルブ５０が連通位置に保持され、スライドシリンダ１４のロッド側の圧油供給管路４６も作動油タンク３８に連通する。その結果、この時点でスライドシリンダ１４はフリーの状態となりその保持圧が開放される。   At this time, the timer relay T2 is also energized via the relay contact RA 'when a degeneration command to the slide cylinder 14 is given. As shown in FIG. 7, when the lifting operation of the receiving platform 5 started at time t1 is completed at time t2, a command signal is output from the time t2 to the solenoid driving portion 52a on the retracting operation side of the slide cylinder 14, and the operation is performed for the retracting operation. The control valve 52 is switched to the communication position, and the pressure oil supply line 49 on the bottom side of the slide cylinder 14 communicates with the hydraulic oil tank 38. In the present embodiment, the command signal to the solenoid drive unit 50a on the extension operation side of the slide cylinder 14 is continuously output even after the solenoid drive unit 52a on the degeneration command side is energized, and the control valve 50 for extension operation communicates. The pressure oil supply conduit 46 on the rod side of the slide cylinder 14 is also communicated with the hydraulic oil tank 38. As a result, at this time, the slide cylinder 14 is in a free state and its holding pressure is released.

そして、時刻ｔ２にタイマリレーＴ２が励磁され、励磁状態のまま設定時間Δｔ（例えば０．２秒程度）が経過すると（時刻ｔ３になると）、オンディレータイマ接点Ｔ２’が閉じ、リレーコイルＲＡ’が励磁されて対応のリレー接点ＲＡ’が開き、ソレノイド駆動部５０ａへの指令信号が遮断されて伸長動作用コントロールバルブ５０が遮断位置に切り換わる。これにより、スライドシリンダ１４のロッド側に圧油が供給され、スライドシリンダ１４の縮退動作が開始される。その後、荷受台５が前方にスライドしスライダ９が前端側のストッパ１５に当接する位置まで移動して図８の状態になると、荷受台５の格納が完了する。   Then, when the timer relay T2 is excited at time t2 and a set time Δt (for example, about 0.2 seconds) elapses in the excited state (at time t3), the on-delay timer contact T2 ′ is closed and the relay coil RA ′. Is excited, the corresponding relay contact RA ′ is opened, the command signal to the solenoid drive unit 50a is cut off, and the extension operation control valve 50 is switched to the cut-off position. As a result, pressure oil is supplied to the rod side of the slide cylinder 14 and the slide cylinder 14 starts to be retracted. Thereafter, when the load receiving platform 5 slides forward and moves to a position where the slider 9 abuts against the stopper 15 on the front end side and enters the state of FIG. 8, the storage of the load receiving platform 5 is completed.

以上のように、本実施の形態においては、荷受台５の格納動作時、縮退動作用コントロールバルブ５２が連通位置に切り換わってから設定時間Δｔ（＝ｔ３−ｔ２）が経過するまで伸長動作用コントロールバルブ５０を連通位置に保持して圧油供給管路３９，４６，４９を作動油タンク３８に連通し、縮退動作の初動時のスライドシリンダ１４の保持圧を開放して設定時間Δｔが経過した後に伸長動作用コントロールバルブ５０を遮断位置に切り換える。これにより、縮退動作の初動時において設定時間Δｔの間だけスライドシリンダ１４はフリー状態となり、設定時間Δｔだけ遅れて時刻ｔ３にスライドシリンダの縮退動作が開始される。したがって、荷受台５の格納動作時に、荷受台５の上昇動作からスライド動作への移行を一時的に遅らせ、急激な動作移行による発生音を防止することができる。   As described above, in the present embodiment, during the retracting operation of the load receiving platform 5, the set time Δt (= t3−t2) elapses after the contraction operation control valve 52 is switched to the communication position. The control valve 50 is held in the communication position, the pressure oil supply lines 39, 46, 49 are connected to the hydraulic oil tank 38, the holding pressure of the slide cylinder 14 at the initial operation of the retracting operation is released, and the set time Δt has elapsed. After that, the extension operation control valve 50 is switched to the blocking position. As a result, the slide cylinder 14 is in a free state only during the set time Δt at the initial operation of the retracting operation, and the retracting operation of the slide cylinder is started at time t3 with a delay of the set time Δt. Therefore, during the storing operation of the load receiving platform 5, it is possible to temporarily delay the transition from the ascending operation of the load receiving platform 5 to the sliding operation, and to prevent the sound generated by the rapid operation shift.

また、本実施の形態において、荷受台５の昇降動作時には、荷受台５を支持する昇降駆動部７の基部（スライダ９）をしっかりと固定するため、スライダ９が後端側ストッパ１６に押し付けられるようにスライドシリンダ１４を付勢している。詳細な説明は省略するが、構造上、一般に後端側ストッパ１６に押し付けられたスライダ９は固定姿勢をとるためにガイドレール８から僅かに浮き上がる。その結果、荷受台５を格納する際に荷受台５を前方側へスライドさせるとき、僅かに浮き上がっていたスライダ９がガイドレール８に急激に降下することになるので、その際の衝撃も動作移行時の発生音の要因となり得る。   Further, in the present embodiment, when the load receiving platform 5 is moved up and down, the slider 9 is pressed against the rear end side stopper 16 in order to firmly fix the base (slider 9) of the lifting drive unit 7 that supports the load receiving platform 5. Thus, the slide cylinder 14 is biased. Although a detailed description is omitted, the slider 9 generally pressed against the rear end side stopper 16 is slightly lifted from the guide rail 8 in order to take a fixed posture. As a result, when the load receiving stand 5 is slid forward when the load receiving stand 5 is stored, the slider 9 that has been slightly lifted is suddenly lowered to the guide rail 8, so that the impact at that time is also transferred to the operation. It may be a factor of sound generated at the time.

本実施の形態によれば、荷受台５の上昇からスライドの動作移行時に設定時間Δｔが経過するまでスライドシリンダ１４をフリー状態とするので、スライダ９が積極的にではなく自重により消極的にガイドレール８に降下するので、その際に生じる衝撃音も緩和することができる。   According to the present embodiment, since the slide cylinder 14 is in a free state until the set time Δt elapses when the slide operation transitions from the ascent of the cargo receiving platform 5, the slider 9 is not positively guided by its own weight. Since it descends to the rail 8, the impact sound generated at that time can be reduced.

なお、本実施の形態においては、リレー回路でスライドシリンダの縮退初動時にスライドシリンダの伸長を指令する駆動指令信号が併せて出力される構成を採ったが、例えばコントローラによりスライドシリンダの縮退初動時にスライドシリンダの伸長を指令する駆動指令信号が併せて出力される構成としても良い。この場合も同様の効果を得ることができる。   In this embodiment, the relay circuit is configured to output a drive command signal for instructing the extension of the slide cylinder when the slide cylinder is initially retracted. However, for example, the controller slides when the slide cylinder is initially retracted. A drive command signal that commands extension of the cylinder may also be output. In this case, the same effect can be obtained.

図１５は本実施の形態の他の実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。この図において、先の図５等と同様の部分には同符号を付し説明を省略する。
本実施の形態は、荷受台５を格納する際、荷受台５の上昇動作からスライド動作への移行時、上昇動作が完了してから設定時間経過後にスライドシリンダの縮退動作を指令する指令信号を出力する実施の形態である。この縮退動作を遅延させる手段は、格納動作時におけるリフトシリンダ２２の上昇動作が完了し荷受台５が格納高さに到達したことを検出する検出手段（ゲートセンサ１８及びアームセンサ２８）と、これらの検出手段からの検出信号が入力されるとリフトシリンダ２２の動作を停止させ、その後タイマ（タイマリレーコイルＴ２）の時間計測により設定時間が経過したらスライドシリンダ１４の縮退動作を指令する指令信号を出力するリレー回路からなる。 FIG. 15 is an electric circuit diagram showing a main part configuration relating to drive control of a retractable load receiving device lifting / lowering apparatus according to another embodiment of the present embodiment. In this figure, the same parts as those in FIG.
In the present embodiment, when storing the load receiving platform 5, a command signal for instructing a contracting operation of the slide cylinder after a set time elapses after the lifting operation is completed at the time of transition from the rising operation of the load receiving platform 5 to the sliding operation. This is an embodiment to output. The means for delaying the degeneration operation includes detection means (gate sensor 18 and arm sensor 28) for detecting that the lifting operation of the lift cylinder 22 during the storage operation is completed and the load receiving platform 5 has reached the storage height, and these When the detection signal from the detection means is input, the operation of the lift cylinder 22 is stopped, and then a command signal for instructing the degeneration operation of the slide cylinder 14 is issued when the set time has elapsed by measuring the time of the timer (timer relay coil T2). It consists of an output relay circuit.

図１５に示す電気回路では、上昇動作からスライド動作に切り換わる際、オンディレータイマのリレーコイルＴ２及びリレー接点Ｔ２’を有するタイマ回路によって設定時間Δｔ経過後にリレーコイルＲＡが励磁されるとリレー接点ＲＡ’が閉じ、スライドシリンダ１４の縮退指令側のソレノイド駆動部５２ａに指令信号が出力されるように構成されている。このとき、特に縮退動作の初動指令時にスライドシリンダ１４の伸長指令側のソレノイド駆動部５０ａに駆動指令信号は出力されず、縮退指令側のソレノイド駆動部５２ａに指令信号が出力されると同時に、スライドシリンダ１４の縮退動作が開始される。その他、先に図６に示した回路等を含めた他の構成は、図１〜図１４で説明した前の実施の形態と同様である。   In the electric circuit shown in FIG. 15, when switching from the ascending operation to the sliding operation, when the relay coil RA is excited after the set time Δt has elapsed by the timer circuit having the relay coil T2 and the relay contact T2 ′ of the on-delay timer, RA ′ is closed, and a command signal is output to the solenoid drive unit 52a on the degeneration command side of the slide cylinder 14. At this time, the drive command signal is not output to the solenoid drive unit 50a on the extension command side of the slide cylinder 14, particularly at the time of the initial movement command of the contraction operation, and at the same time the command signal is output to the solenoid drive unit 52a on the contraction command side. The degeneration operation of the cylinder 14 is started. Other configurations including the circuit shown in FIG. 6 are the same as those in the previous embodiment described with reference to FIGS.

荷受台５を先に図１２に示した姿勢から図８に示す格納姿勢に移行させる荷受台格納時の本実施の形態における動作について説明すると、この場合、前の実施の形態と同じ要領で図１０に示したように折り畳んだ荷受台５を支持ローラ１２に立て掛ける。するとゲートセンサ１８がＯＮになり、荷受台５が折り畳まれて格納準備がなされたことが検出され、リレーコイルＲ１に通電されリレー接点Ｒ１’が閉じる。   The operation in the present embodiment at the time of storage of the load receiving table for shifting the receiving table 5 from the posture shown in FIG. 12 to the storage posture shown in FIG. 8 will be described in the same manner as in the previous embodiment. The load receiving platform 5 folded as shown in FIG. Then, the gate sensor 18 is turned on, and it is detected that the cargo receiving platform 5 is folded and ready for storage, and the relay coil R1 is energized to close the relay contact R1 '.

この状態で操作スイッチ６２を押すと、重複型リレー接点Ｒ４’のＮＣ側接点を介してリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに通電されソレノイド駆動部４０ａが連通位置に切り換わる。これと同時にリレーコイルＣＴ，Ｔ１（図６参照）が励磁され、リレー接点ＣＴ’が閉じ電動モータ３６が駆動する。これによりリフトシリンダ２２が伸長方向に駆動し、図９の状態まで昇降駆動部７が回動して荷受台５がほぼ水平になると、アームセンサ２８がＯＮになる。すると、リレーコイルＲ２に通電されてリレー接点Ｒ２’が閉じ、リレーコイルＲ４が励磁されて重複型のリレー接点Ｒ４’が図１５の状態からＮＯ側接点に切り換わる。   When the operation switch 62 is pressed in this state, the solenoid drive unit 40a of the control valve 40 for the extension operation of the lift cylinder 22 is energized through the NC side contact of the overlapping relay contact R4 ′, and the solenoid drive unit 40a is switched to the communication position. Change. At the same time, the relay coils CT and T1 (see FIG. 6) are excited, the relay contact CT 'is closed, and the electric motor 36 is driven. As a result, the lift cylinder 22 is driven in the extending direction, and when the elevating drive unit 7 rotates to the state shown in FIG. 9 and the load receiving platform 5 becomes substantially horizontal, the arm sensor 28 is turned on. Then, the relay coil R2 is energized to close the relay contact R2 ', the relay coil R4 is excited, and the overlapping relay contact R4' is switched from the state of FIG. 15 to the NO side contact.

さらに操作スイッチ６２を押し続けると、リレー接点Ｒ４’のＮＯ側接点を介してタイマリレーＴ２に通電される。図１６に示すように時刻ｔ１に開始した荷受台５の上昇動作が時刻ｔ２に完了する場合、時刻ｔ２からタイマリレーＴ２が励磁され、励磁状態のまま設定時間Δｔ（例えば０．２秒程度）が経過すると（時刻ｔ３になると）、オンディレータイマ接点Ｔ２’が閉じ、リレーコイルＲＡ’が励磁されて対応のリレー接点ＲＡ’が閉じ、スライドシリンダ１４の縮退動作を指令するソレノイド駆動部５２ａへの指令信号が出力され、縮退動作用コントロールバルブ５２が連通位置に切り換わる。これにより、時刻ｔ３からスライドシリンダ１４のロッド側に圧油が供給され、スライドシリンダ１４の縮退動作が開始される。その後、荷受台５が前方にスライドしスライダ９が前端側のストッパ１５に当接する位置まで移動して図８の状態になると、荷受台５の格納が完了する。   When the operation switch 62 is further pressed, the timer relay T2 is energized through the NO side contact of the relay contact R4 '. As shown in FIG. 16, when the ascending operation of the receiving platform 5 started at time t1 is completed at time t2, the timer relay T2 is excited from time t2 and remains in the excited state for a set time Δt (for example, about 0.2 seconds). When time elapses (at time t3), the on-delay timer contact T2 ′ is closed, the relay coil RA ′ is excited and the corresponding relay contact RA ′ is closed, and the solenoid drive unit 52a that commands the degeneration operation of the slide cylinder 14 is performed. Is output, and the control valve 52 for the degeneration operation is switched to the communication position. Thereby, pressure oil is supplied to the rod side of the slide cylinder 14 from time t3, and the contraction operation of the slide cylinder 14 is started. Thereafter, when the load receiving platform 5 slides forward and moves to a position where the slider 9 abuts against the stopper 15 on the front end side and enters the state of FIG. 8, the storage of the load receiving platform 5 is completed.

本実施の形態においても、荷受台５の格納動作時、荷受台５の動作が上昇からスライドに移行する際、荷受台５の上昇動作からスライド動作への移行を一時的に（設定時間Δｔだけ）遅らせ、急激な動作移行による発生音を防止することができる。   Also in the present embodiment, during the storage operation of the load receiving platform 5, when the operation of the load receiving platform 5 shifts from ascending to sliding, the transition from the ascending operation of the load receiving platform 5 to the sliding operation is performed temporarily (for the set time Δt). ) Delayed sound can be prevented due to sudden movement transition.

なお、本実施の形態においては、リレー回路でスライドシリンダの縮退動作を遅延させる構成を採ったが、例えばコントローラによりタイマで時間計測し荷受台５の上昇後のスライド動作を遅延させる構成としても良い。この場合も同様の効果を得ることができる。   In the present embodiment, a configuration is adopted in which the slide circuit is degenerated by the relay circuit, but the slide operation may be delayed by, for example, a timer using a timer to delay the slide operation after the load receiving platform 5 is raised. . In this case, the same effect can be obtained.

図１７は本実施の形態のさらに他の実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。この図において、先の図５等と同様の部分には同符号を付し説明を省略する。
本実施の形態は、荷受台５を格納する際、荷受台５の上昇動作からスライド動作への移行時、リフトシリンダ２２の伸長速度を抑制する実施の形態である。 FIG. 17 is an electric circuit diagram showing a configuration of a main part relating to drive control of a retractable cargo receiver lifting device according to still another embodiment of the present embodiment. In this figure, the same parts as those in FIG.
This embodiment is an embodiment in which, when storing the load receiving platform 5, the extension speed of the lift cylinder 22 is suppressed at the time of transition from the ascending operation of the load receiving platform 5 to the sliding operation.

本実施の形態においても、図４に示した油圧駆動装置を備えているが、少なくともリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａは比例電磁式のものに置き換える。また、図１７に示した本実施の形態における電気回路では、各コントロールバルブ４０，４２，５０，５２のソレノイド駆動部４０ａ，４２ａ，５０ａ，５２ａへの指令信号は予め格納されたプログラムに従ってコントローラ６５により出力される。このコントローラ６５は、設定時間の間に格納したプログラムに従って減少する駆動指令信号を比例電磁式のコントロールバルブ４０に出力する機能を有しており、伸長動作用コントロールバルブ４０とともに、荷受台５の格納動作時に荷受台５の上昇動作からスライド動作に移行する際、リフトシリンダ２２による荷受台５の上昇動作完了時に設定時間の間で動作速度が徐々に減速されて停止するようにリフトシリンダ２２を動作制御する制御手段としての役割を果たす。その他、先に図６に示した回路等を含めた他の構成は、図１〜図１４で説明した前の実施の形態と同様である。   In this embodiment, the hydraulic drive unit shown in FIG. 4 is also provided, but at least the solenoid drive unit 40a of the extension operation control valve 40 of the lift cylinder 22 is replaced with a proportional electromagnetic type. Further, in the electric circuit in the present embodiment shown in FIG. 17, the command signal to the solenoid driving portions 40a, 42a, 50a, 52a of the control valves 40, 42, 50, 52 is sent to the controller 65 in accordance with a program stored in advance. Is output by. The controller 65 has a function of outputting a drive command signal that decreases in accordance with a program stored during a set time to the proportional electromagnetic control valve 40, and stores the load receiving platform 5 together with the extension operation control valve 40. When shifting from the rising operation of the load receiving platform 5 to the sliding operation during operation, the lift cylinder 22 is operated so that the operation speed is gradually decelerated during the set time when the lifting operation of the load receiving platform 5 by the lift cylinder 22 is completed. It serves as a control means for controlling. Other configurations including the circuit shown in FIG. 6 are the same as those in the previous embodiment described with reference to FIGS.

本実施の形態において、荷受台５を先に図１２に示した姿勢から図８に示す格納姿勢に移行させる場合、まず前の実施の形態と同じ要領で図１０に示したように折り畳んだ荷受台５を支持ローラ１２に立て掛ける。するとゲートセンサ１８がＯＮになり、荷受台５が折り畳まれて格納準備がなされたことが検出され、その検出信号がコントローラ６５に出力される。このときアームセンサ２８の検出信号はＯＦＦである。   In the present embodiment, when the load receiving platform 5 is first shifted from the posture shown in FIG. 12 to the retracted posture shown in FIG. 8, first, the load receiver folded as shown in FIG. 10 in the same manner as the previous embodiment. The stand 5 is leaned against the support roller 12. Then, the gate sensor 18 is turned on, and it is detected that the cargo receiving platform 5 is folded and ready for storage, and a detection signal is output to the controller 65. At this time, the detection signal of the arm sensor 28 is OFF.

このゲートセンサ１８の検出信号がＯＮで且つアームセンサ２８からの検出信号がＯＦＦという条件下では、荷受台５の上昇又は前方へのスライドを指令する操作スイッチ６２をＯＮにすると、コントローラ６５は予め格納したプログラムに従って操作スイッチ６２からの操作信号に応じてリフトシリンダ２２を伸長させる駆動指令信号を生成する。この駆動指令信号がリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに出力されるとソレノイド駆動部４０ａが連通位置に切り換わる。これと同時にコントローラ６５はリレーコイルＣＴ，Ｔ１（図６参照）に通電し、リレー接点ＣＴ’を閉じさせて電動モータ３６を駆動させる。これによりリフトシリンダ２２が伸長方向に駆動し、図９の状態まで昇降駆動部７が回動して荷受台５が上昇する。   Under the condition that the detection signal of the gate sensor 18 is ON and the detection signal from the arm sensor 28 is OFF, when the operation switch 62 for instructing raising of the cargo receiving platform 5 or sliding forward is turned ON, the controller 65 is preliminarily set. A drive command signal for extending the lift cylinder 22 is generated in accordance with the operation signal from the operation switch 62 in accordance with the stored program. When this drive command signal is output to the solenoid drive unit 40a of the extension operation control valve 40 of the lift cylinder 22, the solenoid drive unit 40a is switched to the communication position. At the same time, the controller 65 energizes the relay coils CT and T1 (see FIG. 6), closes the relay contact CT ', and drives the electric motor 36. As a result, the lift cylinder 22 is driven in the extending direction, and the elevating drive unit 7 is rotated to the state shown in FIG.

このとき、本実施の形態においては、荷受台５の格納動作時に荷受台５の上昇動作からスライド動作に移行する際、リフトシリンダ２２による荷受台５の上昇動作完了時に、上昇動作完了直前の設定時間Δｔ（例えば０．５秒程度）の間で荷受台５の上昇動作速度が徐々に減速されて停止するように、リフトシリンダ２２を動作制御する。具体的には、図１８に示すように時刻ｔ１に開始した荷受台５の上昇動作が時刻ｔ３に完了する場合、コントローラ６５は、その直前の時刻ｔ２（＝ｔ３−Δｔ）からソレノイド駆動部４０ａへの駆動指令信号の大きさを比例的に減じていき、時刻ｔ３に駆動指令信号が０（ゼロ）となり且つ荷受台５の上昇動作が完了し図９の状態となるように、予め格納したプログラムに従って駆動指令信号を制御する。そして、このような動作を経て荷受台５がほぼ水平になると、アームセンサ２８がＯＮになる。   At this time, in the present embodiment, when shifting from the ascending operation of the receiving platform 5 to the sliding operation during the storing operation of the receiving platform 5, the setting immediately before completion of the ascending operation is completed when the lifting operation of the receiving platform 5 by the lift cylinder 22 is completed. The operation of the lift cylinder 22 is controlled so that the ascending operation speed of the load receiving platform 5 is gradually reduced and stopped during a time Δt (for example, about 0.5 seconds). Specifically, as shown in FIG. 18, when the ascending operation of the receiving platform 5 started at time t <b> 1 is completed at time t <b> 3, the controller 65 starts the solenoid driving unit 40 a from time t <b> 2 (= t <b> 3 −Δt) immediately before that. The magnitude of the drive command signal is reduced proportionally, and stored in advance so that the drive command signal becomes 0 (zero) at time t3 and the lifting operation of the load receiving platform 5 is completed and the state shown in FIG. 9 is obtained. The drive command signal is controlled according to the program. Then, when the load receiving platform 5 becomes almost horizontal through such an operation, the arm sensor 28 is turned on.

ゲートセンサ１８及びアームセンサ２８の検出信号がともにＯＮの条件下では、予め格納したプログラムに従って、コントローラ６５は、操作スイッチ６２からの操作信号に応じてスライドシリンダ１４を縮退させる駆動指令信号を生成する。この駆動指令信号がスライドシリンダ１４の縮退動作用コントロールバルブ５２のソレノイド駆動部５２ａに出力されるとソレノイド駆動部５２ａが連通位置に切り換わる。このように、時刻ｔ３からスライドシリンダ１４のロッド側に圧油が供給され、スライドシリンダ１４の縮退動作が開始される。その後、荷受台５が前方にスライドしスライダ９が前端側のストッパ１５に当接する位置まで移動して図８の状態になると、荷受台５の格納が完了する。   Under the condition that the detection signals of the gate sensor 18 and the arm sensor 28 are both ON, the controller 65 generates a drive command signal for degenerating the slide cylinder 14 in accordance with the operation signal from the operation switch 62 in accordance with a previously stored program. . When this drive command signal is output to the solenoid drive part 52a of the control valve 52 for the retracting operation of the slide cylinder 14, the solenoid drive part 52a is switched to the communication position. Thus, pressure oil is supplied to the rod side of the slide cylinder 14 from time t3, and the contraction operation of the slide cylinder 14 is started. Thereafter, when the load receiving platform 5 slides forward and moves to a position where the slider 9 abuts against the stopper 15 on the front end side and enters the state of FIG. 8, the storage of the load receiving platform 5 is completed.

本実施の形態においては、荷受台５の格納動作時に荷受台５の動作が上昇からスライドに移行する際、荷受台５の上昇動作速度を徐々に減速し緩やかに上昇停止した後にスライド動作に移行するように荷受台５の格納動作を制御することができる。したがって急激な動作移行による発生音を防止することができる。   In the present embodiment, when the operation of the load receiving platform 5 shifts from rising to slide during the storage operation of the load receiving platform 5, the operation speed of the load receiving platform 5 is gradually decelerated and then slowly lifted and stopped before moving to the slide operation. Thus, the storing operation of the receiving platform 5 can be controlled. Therefore, it is possible to prevent a sound generated due to a sudden operation transition.

図１９は本実施の形態のさらに他の実施の形態に係る格納式荷受台昇降装置の制御手段による動作制御のタイミングチャートである。
本実施の形態は、荷受台５を格納する際、荷受台５の上昇動作からスライド動作への移行時、スライドシリンダ１４の初動速度を抑制する実施の形態であり、その構成は図１７の実施の形態とほぼ同様である。 FIG. 19 is a timing chart of the operation control by the control means of the retractable cargo receiver lifting device according to still another embodiment of the present embodiment.
The present embodiment is an embodiment in which the initial movement speed of the slide cylinder 14 is suppressed during the transition from the ascending operation of the load receiving platform 5 to the sliding operation when the load receiving platform 5 is stored. It is almost the same as the form.

図１７の実施の形態と相違する点は、第一に、図４に示した油圧駆動装置において、少なくともスライドシリンダ１４の縮退動作用コントロールバルブ５２のソレノイド駆動部５２ａを比例電磁式のものに置き換える必要がある点である。第二に、図１７に示した電気回路において、コントローラ６５は、設定時間の間に格納したプログラムに従って増大する駆動指令信号を比例電磁式のコントロールバルブ５２に出力する機能を有するものであり、縮退動作用コントロールバルブ５２とともに、荷受台５の格納動作時に荷受台５の上昇動作からスライド動作に移行する際、スライドシリンダ１４の縮退動作の初動時に設定時間の間で動作速度が徐々に加速されて設定速度に達するようにスライドシリンダ１４を動作制御する制御手段としての役割を果たす。その他、先に図６に示した回路等を含めた他の構成は、図１７等で説明した前の実施の形態と同様である。   The difference from the embodiment of FIG. 17 is that, first, in the hydraulic drive device shown in FIG. 4, at least the solenoid drive part 52a of the control valve 52 for the retracting operation of the slide cylinder 14 is replaced with a proportional electromagnetic type. This is a necessary point. Second, in the electric circuit shown in FIG. 17, the controller 65 has a function of outputting a drive command signal that increases in accordance with a program stored during a set time to the proportional electromagnetic control valve 52, and is degenerated. When moving from the ascending operation of the load receiving platform 5 to the sliding operation during the retracting operation of the load receiving platform 5 together with the operation control valve 52, the operating speed is gradually accelerated during the set time when the slide cylinder 14 is initially retracted. It serves as a control means for controlling the operation of the slide cylinder 14 so as to reach the set speed. Other configurations including the circuit shown in FIG. 6 are the same as those of the previous embodiment described with reference to FIG.

本実施の形態において、荷受台５を先に図１２に示した姿勢から図８に示す格納姿勢に移行させる場合、まず前述した各実施の形態と同じ要領で図１０に示したように折り畳んだ荷受台５を支持ローラ１２に立て掛ける。するとゲートセンサ１８がＯＮになり、荷受台５が折り畳まれて格納準備がなされたことが検出され、その検出信号がコントローラ６５に出力される。このときアームセンサ２８の検出信号はＯＦＦである。   In the present embodiment, when the receiving platform 5 is shifted from the posture shown in FIG. 12 to the retracted posture shown in FIG. 8, it is first folded as shown in FIG. 10 in the same manner as each of the embodiments described above. The load receiving stand 5 is leaned against the support roller 12. Then, the gate sensor 18 is turned on, and it is detected that the cargo receiving platform 5 is folded and ready for storage, and a detection signal is output to the controller 65. At this time, the detection signal of the arm sensor 28 is OFF.

このゲートセンサ１８の検出信号がＯＮで且つアームセンサ２８からの検出信号がＯＦＦという条件下では、荷受台５の上昇又は前方へのスライドを指令する操作スイッチ６２をＯＮにすると、コントローラ６５は予め格納したプログラムに従って操作スイッチ６２からの操作信号に応じてリフトシリンダ２２を伸長させる駆動指令信号を生成する。この駆動指令信号がリフトシリンダ２２の伸長動作用コントロールバルブ４０のソレノイド駆動部４０ａに出力されるとソレノイド駆動部４０ａが連通位置に切り換わる。これと同時にコントローラ６５はリレーコイルＣＴ，Ｔ１（図６参照）に通電し、リレー接点ＣＴ’を閉じさせて電動モータ３６を駆動させる。これによりリフトシリンダ２２が伸長方向に駆動し、図９の状態まで昇降駆動部７が回動して荷受台５が上昇し、荷受台５がほぼ水平になるとアームセンサ２８がＯＮになる。   Under the condition that the detection signal of the gate sensor 18 is ON and the detection signal from the arm sensor 28 is OFF, when the operation switch 62 for instructing raising of the cargo receiving platform 5 or sliding forward is turned ON, the controller 65 is preliminarily set. A drive command signal for extending the lift cylinder 22 is generated in accordance with the operation signal from the operation switch 62 in accordance with the stored program. When this drive command signal is output to the solenoid drive unit 40a of the extension operation control valve 40 of the lift cylinder 22, the solenoid drive unit 40a is switched to the communication position. At the same time, the controller 65 energizes the relay coils CT and T1 (see FIG. 6), closes the relay contact CT ', and drives the electric motor 36. As a result, the lift cylinder 22 is driven in the extending direction, the elevating drive unit 7 is rotated to the state shown in FIG. 9 and the load receiving platform 5 is raised, and the arm sensor 28 is turned on when the load receiving platform 5 becomes substantially horizontal.

ゲートセンサ１８及びアームセンサ２８の検出信号がともにＯＮの条件下では、予め格納したプログラムに従って、コントローラ６５は、操作スイッチ６２からの操作信号に応じてスライドシリンダ１４を縮退させる駆動指令信号を生成する。この駆動指令信号がスライドシリンダ１４の縮退動作用コントロールバルブ５２のソレノイド駆動部５２ａに出力されるとソレノイド駆動部５２ａが連通位置に切り換わる。   Under the condition that the detection signals of the gate sensor 18 and the arm sensor 28 are both ON, the controller 65 generates a drive command signal for degenerating the slide cylinder 14 in accordance with the operation signal from the operation switch 62 in accordance with a previously stored program. . When this drive command signal is output to the solenoid drive part 52a of the control valve 52 for the retracting operation of the slide cylinder 14, the solenoid drive part 52a is switched to the communication position.

このとき、本実施の形態においては、荷受台５の格納動作時に荷受台５の上昇動作からスライド動作に移行する際、スライドシリンダ１４による荷受台５のスライド動作開始時に設定時間Δｔ（例えば０．５秒程度）の間で荷受台５のスライド動作速度が０（ゼロ）から徐々に加速されて設定速度に達するように、スライドシリンダ１４を動作制御する。具体的には、図１９に示すように時刻ｔ１に開始した荷受台５の上昇動作が時刻ｔ２に完了する場合、コントローラ６５は、その後の時刻ｔ３（＝ｔ２＋Δｔ）までの間にソレノイド駆動部５２ａへの駆動指令信号の大きさを比例的に増大させていき、時刻ｔ３に駆動指令信号が一定の大きさとなり設定速度に達するように、予め格納したプログラムに従って駆動指令信号を制御する。このような動作を経て、時刻ｔ３以降、一定の設定速度で荷受台５が前方にスライドしスライダ９が前端側のストッパ１５に当接する位置まで移動して図８の状態になると、荷受台５の格納が完了する。   At this time, in the present embodiment, when shifting from the ascending operation of the receiving platform 5 to the sliding operation during the storing operation of the receiving platform 5, the set time Δt (for example, 0. 0) is started when the sliding operation of the receiving platform 5 by the slide cylinder 14 is started. The operation of the slide cylinder 14 is controlled so that the slide operation speed of the load receiving platform 5 is gradually accelerated from 0 (zero) to reach the set speed in about 5 seconds). Specifically, as shown in FIG. 19, when the ascending operation of the receiving platform 5 started at time t <b> 1 is completed at time t <b> 2, the controller 65 sets the solenoid driving unit 52 a until the subsequent time t <b> 3 (= t2 + Δt). The drive command signal is controlled in accordance with a program stored in advance so that the drive command signal is proportionally increased and the drive command signal becomes a constant magnitude and reaches the set speed at time t3. After such an operation, after time t3, when the load receiving platform 5 slides forward at a constant set speed and moves to a position where the slider 9 comes into contact with the front end side stopper 15, the load receiving platform 5 The storage of is complete.

本実施の形態においては、荷受台５の格納動作時に荷受台５の動作が上昇からスライドに移行する際、スライド動作の初動速度を抑制しつつ０（ゼロ）から緩やかに加速するように荷受台５の格納動作を制御することができる。したがって急激な動作移行による発生音を防止することができる。   In the present embodiment, when the operation of the load receiving platform 5 shifts from ascending to slide during the retracting operation of the load receiving platform 5, the load receiving platform is configured to gradually accelerate from 0 (zero) while suppressing the initial movement speed of the slide operation. 5 storage operations can be controlled. Therefore, it is possible to prevent a sound generated due to a sudden operation transition.

なお、図１７〜図１９で説明した両実施の形態においては、リフトシリンダ２２とスライドシリンダ１４の動作速度をそれぞれ制御する構成を採ったが、両実施の形態を組み合わせ、両シリンダ１４，２２の動作速度を制御する構成としても良い。この場合も同様の効果を得ることができる。   In addition, in both embodiment demonstrated in FIGS. 17-19, the structure which controls the operating speed of the lift cylinder 22 and the slide cylinder 14, respectively was taken, but both embodiments were combined and both cylinders 14 and 22 were combined. It is good also as a structure which controls operation speed. In this case, the same effect can be obtained.

本発明の一実施の形態に係る格納式荷受台昇降装置を搭載した車両の全体構造を表す側面図である。It is a side view showing the whole structure of the vehicle carrying the retractable load receiving table raising / lowering device which concerns on one embodiment of this invention. 格納時の本発明の格納式荷受台昇降装置の詳細構造を表す斜視図である。It is a perspective view showing the detailed structure of the retractable cradle lifting device of the present invention at the time of storage. 展開時の本発明の格納式荷受台昇降装置の詳細構造を表す斜視図である。It is a perspective view showing the detailed structure of the retractable load receiving table raising / lowering device of the present invention at the time of deployment. 本発明の一実施の形態に係る格納式荷受台昇降装置に備えられた油圧駆動装置の一構成例を表す油圧回路図である。It is a hydraulic circuit diagram showing the example of 1 composition of the hydraulic drive unit with which the retractable load receiving device raising and lowering device concerning one embodiment of the present invention was equipped. 本発明の一実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。It is an electric circuit diagram showing the principal part structure regarding the drive control of the retractable load receiving table raising / lowering device which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。It is an electric circuit diagram showing the principal part structure regarding the drive control of the retractable load receiving table raising / lowering device which concerns on one embodiment of this invention. 本実施の形態の一実施の形態に係る格納式荷受台昇降装置の制御手段による動作制御のタイミングチャートである。It is a timing chart of the operation control by the control means of the retractable cradle lifting device according to an embodiment of the present invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本発明の一実施の形態に係る格納式荷受台昇降装置の動作説明図である。It is operation | movement explanatory drawing of the retractable load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. 本実施の形態の他の実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。It is an electric circuit diagram showing the principal part structure regarding the drive control of the retractable load receiving device raising / lowering device which concerns on other embodiment of this Embodiment. 本実施の形態の他の実施の形態に係る格納式荷受台昇降装置の制御手段による動作制御のタイミングチャートである。It is a timing chart of the operation control by the control means of the retractable cradle lifting device according to another embodiment of the present embodiment. 本実施の形態のさらに他の実施の形態に係る格納式荷受台昇降装置の駆動制御に関する要部構成を表す電気回路図である。It is an electric circuit diagram showing the principal part structure regarding the drive control of the retractable load receiving device raising / lowering device which concerns on other embodiment of this Embodiment. 本実施の形態のさらに他の実施の形態に係る格納式荷受台昇降装置の制御手段による動作制御のタイミングチャートである。It is a timing chart of the operation | movement control by the control means of the retractable cradle raising / lowering apparatus which concerns on further another embodiment of this Embodiment. 本実施の形態のさらに他の実施の形態に係る格納式荷受台昇降装置の制御手段による動作制御のタイミングチャートである。It is a timing chart of the operation | movement control by the control means of the retractable cradle raising / lowering apparatus which concerns on further another embodiment of this Embodiment.

符号の説明Explanation of symbols

４ 格納式荷受台昇降装置
５ 荷受台
１４ スライドシリンダ
１８ ゲートセンサ
２２ リフトシリンダ
２８ アームセンサ
３７ 油圧ポンプ
３８ 作動油タンク
３９ 圧油供給管路
４９ 圧油供給管路
５０ 伸長動作用コントロールバルブ
５１ 圧油排出管路
５２ 縮退動作用コントロールバルブ
６５ コントローラ
ＲＡ リレーコイル
ＲＡ’ リレー接点
Ｔ２ タイマリレーコイル
Ｔ２’ タイマリレー接点
Δｔ 設定時間 4 Retractable load receiving device elevating device 5 Load receiving table 14 Slide cylinder 18 Gate sensor 22 Lift cylinder 28 Arm sensor 37 Hydraulic pump 38 Hydraulic oil tank 39 Pressure oil supply line 49 Pressure oil supply line 50 Control valve 51 for extension operation Pressure oil Discharge conduit 52 Control valve 65 for degeneration operation Controller RA Relay coil RA ′ Relay contact T2 Timer relay coil T2 ′ Timer relay contact Δt Setting time

Claims (4)

車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、
圧油を吐出する油圧ポンプと、
この油圧ポンプからの圧油で駆動されるものであって、伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、
このスライドシリンダのボトム側と前記油圧ポンプとを接続する圧油供給管路と、
この圧油供給管路に設けられ、前記油圧ポンプと前記スライドシリンダのボトム側との連通・遮断状態を切り換える伸長動作用コントロールバルブと、
この伸長動作用コントロールバルブよりも下流側の位置で前記圧油供給管路から分岐され作動油タンクに接続された圧油排出管路と、
この圧油排出管路に設けられ、前記スライドシリンダのボトム側と前記作動油タンクとの連通・遮断状態を切り換える縮退動作用コントロールバルブと、
前記荷受台の上昇動作開始時から前記縮退動作用コントロールバルブの連通位置への切り換わり後設定時間が経過するまでの間、前記伸長動作用コントロールバルブを連通位置に保持して前記圧油供給管路を前記作動油タンクに連通し、縮退動作の初動時の前記スライドシリンダの保持圧を開放して前記設定時間経過後に前記伸長動作用コントロールバルブを遮断位置に切り換える保持圧開放手段と
を備えたことを特徴とする格納式荷受台昇降装置。 In a retractable load receiving device lifting apparatus having a load receiving table that can be stored in a space on the lower side of the vehicle,
A hydraulic pump that discharges pressure oil;
Driven by the pressure oil from the hydraulic pump, the load receiving base in the retracted state is slid to the rear side of the vehicle along with the extending operation, and the load receiving base is moved forward of the vehicle with the retracting operation. A slide cylinder that is slid to the side and stored in a lower space of the vehicle;
A pressure oil supply line connecting the bottom side of the slide cylinder and the hydraulic pump;
An extension operation control valve that is provided in the pressure oil supply pipe and switches between a communication / blocking state between the hydraulic pump and the bottom side of the slide cylinder;
A pressure oil discharge line branched from the pressure oil supply line at a position downstream of the extension operation control valve and connected to the hydraulic oil tank;
A control valve for a degeneracy operation that is provided in the pressure oil discharge pipe and switches a communication / blocking state between the bottom side of the slide cylinder and the hydraulic oil tank;
Between said from receiving platform of the lifting operation start until the elapse of the post-Ri cut drop-in replacement for the set time to the communication position of the compressing operation for the control valve, the holding said extension operation control valve to the communicating position pressure oil Holding pressure release means that connects the supply line to the hydraulic oil tank, releases the holding pressure of the slide cylinder at the time of the initial movement of the retracting operation, and switches the extension operation control valve to the shut-off position after the set time has elapsed; A retractable cradle lifting device characterized by comprising: 車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、
前記荷受台を昇降させるリフトシリンダと、
伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、
前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記リフトシリンダによる前記荷受台の上昇動作が完了してから設定時間経過後に前記スライドシリンダに縮退動作を開始させる縮退動作遅延手段とを備え、
前記縮退遅延手段は、
格納動作時における前記リフトシリンダの上昇動作が完了し前記荷受台が格納高さに到達したことを検出する検出手段と、
この検出手段からの検出信号が入力されると前記リフトシリンダの動作を停止させ、その後タイマの時間計測により前記設定時間が経過したら前記スライドシリンダの縮退動作を指令する指令信号を出力するリレー回路又はコントローラと
を有することを特徴とする格納式荷受台昇降装置。 In a retractable load receiving device lifting apparatus having a load receiving table that can be stored in a space on the lower side of the vehicle,
A lift cylinder for raising and lowering the load receiving table;
A slide cylinder that slides the load receiving table in the retracted state along with the extending operation to the rear side of the vehicle, and slides the load receiving table toward the front side of the vehicle with the retracting operation to store in the lower space of the vehicle; ,
When shifting from the ascending operation of the load receiving table to the sliding operation during the storing operation of the load receiving table, the degenerating operation for causing the slide cylinder to start the degenerating operation after a set time has elapsed after the lifting operation of the load receiving table by the lift cylinder is completed. An operation delay means,
The degeneration delay means includes
Detecting means for detecting that the lifting operation of the lift cylinder during the storage operation has been completed and the load receiving table has reached the storage height;
When the detection signal from the detection means is input, the operation of the lift cylinder is stopped, and then the relay circuit that outputs a command signal for instructing the retracting operation of the slide cylinder when the set time has elapsed by measuring the time of a timer, or A retractable cargo receiving platform lifting device comprising a controller. 車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、
前記荷受台を昇降させるリフトシリンダと、
伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、
前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記スライドシリンダの縮退動作の初動時に設定時間の間で動作速度が徐々に加速されて設定速度に達するように前記スライドシリンダを動作制御する制御手段とを備え、
前記制御手段は、
前記スライドシリンダ又は前記リフトシリンダに圧油を切換供給する比例電磁式のコントロールバルブと、
前記設定時間の間に格納したプログラムに従って増大又は減少する指令信号を前記コントロールバルブに出力するコントローラと
を有することを特徴とする格納式荷受台昇降装置。 In a retractable load receiving device lifting apparatus having a load receiving table that can be stored in a space on the lower side of the vehicle,
A lift cylinder for raising and lowering the load receiving table;
A slide cylinder that slides the load receiving table in the retracted state along with the extending operation to the rear side of the vehicle, and slides the load receiving table toward the front side of the vehicle with the retracting operation to store in the lower space of the vehicle; ,
When shifting from the ascending operation of the load receiving table to the sliding operation during the retracting operation of the load receiving table, the operation speed is gradually accelerated during a set time at the initial operation of the retracting operation of the slide cylinder so as to reach the set speed. Control means for controlling the operation of the slide cylinder,
The control means includes
A proportional electromagnetic control valve that supplies pressure oil to the slide cylinder or the lift cylinder;
And a controller that outputs to the control valve a command signal that increases or decreases according to a program stored during the set time. 車両の下部側の空間に格納可能な荷受台を有する格納式荷受台昇降装置において、
前記荷受台を昇降させるリフトシリンダと、
伸長動作に伴って格納状態の前記荷受台を前記車両の後方側にスライドさせ、縮退動作に伴って前記荷受台を前記車両の前方側にスライドさせて前記車両の下部空間に格納するスライドシリンダと、
前記荷受台の格納動作時に前記荷受台の上昇動作からスライド動作に移行する際、前記リフトシリンダによる前記荷受台の上昇動作完了時に設定時間の間で動作速度が徐々に減速されて停止するように前記リフトシリンダを動作制御する制御手段とを備え、
前記制御手段は、
前記スライドシリンダ又は前記リフトシリンダに圧油を切換供給する比例電磁式のコントロールバルブと、
前記設定時間の間に格納したプログラムに従って増大又は減少する指令信号を前記コントロールバルブに出力するコントローラと
を有することを特徴とする格納式荷受台昇降装置。 In a retractable load receiving device lifting apparatus having a load receiving table that can be stored in a space on the lower side of the vehicle,
A lift cylinder for raising and lowering the load receiving table;
A slide cylinder that slides the load receiving table in the retracted state along with the extending operation to the rear side of the vehicle, and slides the load receiving table toward the front side of the vehicle with the retracting operation to store in the lower space of the vehicle; ,
When shifting from the lifting operation of the load receiving table to the sliding operation during the storing operation of the load receiving table, the operation speed is gradually reduced during a set time when the lifting operation of the load receiving table by the lift cylinder is completed and stopped. Control means for controlling the operation of the lift cylinder,
The control means includes
A proportional electromagnetic control valve that supplies pressure oil to the slide cylinder or the lift cylinder;
And a controller that outputs to the control valve a command signal that increases or decreases according to a program stored during the set time.
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JP2009202667A (en) * 2008-02-26 2009-09-10 Shin Meiwa Ind Co Ltd Storage type cargo receiving platform elevating device
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JP5982204B2 (en) * 2012-07-13 2016-08-31 極東開発工業株式会社 Hydraulic mechanism for trucks and hydraulic mechanism for lifting platform
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