CN201923792U

CN201923792U - Hydraulic safety device for overload restart of movable type crane vehicles

Info

Publication number: CN201923792U
Application number: CN2010206379004U
Authority: CN
Inventors: 段超飞; 陆远望; 韦邦州
Original assignee: ANHUI XINGMA AUTOMOBILE Co Ltd
Current assignee: ANHUI XINGMA AUTOMOBILE Co Ltd
Priority date: 2010-12-01
Filing date: 2010-12-01
Publication date: 2011-08-10
Anticipated expiration: 2020-12-01

Abstract

The utility model relates to a hydraulic safety device for the overload restart of movable type crane vehicles and belongs to crane vehicle hydraulic devices. The hydraulic safety device is characterized in that ports are formed on a rodless cavity of a left bearing support leg oil cylinder and that of a right bearing support leg oil cylinder, a left support leg explosion-proof pipe valve and a right support leg explosion-proof pipe valve are connected with the ports through oil passages, and a shuttle valve is connected with pipeline oil ports of the left support leg explosion-proof pipe valve and the right bearing support leg explosion-proof pipe through oil passages; and an overload setting valve is connected with an oil outlet of the shuttle valve through an oil passage, an overload restarting valve is connected with an oil inlet of the overload setting valve through an oil passage, an unloading oil port of the overload restarting valve is connected to an oil tank through an oil pipe, an oil inlet of the overload restarting valve is connected with an oil outlet of a one-way valve, and an oil inlet of the one-way valve is connected with an oil pump and a rodless cavity of an action oil cylinder simultaneously through an oil passage. The overload setting valve starts when a vehicle overloads, and working pressure oil generated by the oil pump is connected with the oil tank, so that the action oil cylinder can not conduct lifting actions, which effectively prevents overload lifting.

Description

The fluid pressure warning device that portable lifting vehicle overload is restarted

Technical field

The utility model belongs to lifting vehicle hydraulic efficiency gear, especially relates to a kind of fluid pressure warning device of portable lifting vehicle.

Background technology

At present, the hydraulic efficiency pressure system of portable lifting vehicle is typically equipped with the by pass valve overload protective device, withstands spool but such antioverloading valve gear is generally spring, when overload, the pressure of oil pump outlet raises greater than the setting pressure of spring, and pressure oil backs down spring from the direct oil sump tank of by pass valve; But the opening of this by pass valve is less, and the oil liquid resistance that passes through is bigger, so such antioverloading response valve is sensitive inadequately, protect not accurate enoughly, and antioverloading poor effect, overload are difficult for discovery in time; Energy after the hydraulic oil overflow of band pressure all changes into heat energy, make the temperature build-up of hydraulic oil in the hydraulic efficiency pressure system, such by pass valve overload protective device does not satisfy the security requirement of portable lifting vehicle when using on the portable lifting vehicle of large-tonnage, often have potential safety hazard.

Summary of the invention

The purpose of this utility model provides the fluid pressure warning device that a kind of portable lifting vehicle overload is restarted, sensitivity is swift in response, can correctly monitor, find the phenomenon of lifting overload of vehicle lifting in time, prevent that effectively the harm that the operation because of the overload lifting of operating personal brings from taking place, eliminate safe hidden trouble, ensure safety in production.

The purpose of this utility model is achieved like this: the fluid pressure warning device that a kind of portable lifting vehicle overload is restarted comprises fuel tank, oil pump (being pressure source), action tank (being jack cylinder), left withstand leg oil cylinder and right withstand leg oil cylinder; This left side withstand leg oil cylinder and right withstand leg oil cylinder are to the most direct position of overload reaction in the portable lifting vehicle, it is characterized in that size by more left withstand leg oil cylinder and right withstand leg oil cylinder rodless cavity pressure oil pressure, getting a wherein bigger safe pressure setup pressure value of setting in the valve with overload compares, when lifting overloads, pressure oil and fuel tank that the overload action is required are connected, the overload action can not be carried out, thereby play the effect of safety guard-safeguard; Offer interface and use the explosion-proof pipe valve of oil duct connection left branch leg at the rodless cavity of left withstand leg oil cylinder, end face hydraulic fluid port on the explosion-proof pipe valve of this oil duct and left branch leg (going up interface) joins, and the pipeline hydraulic fluid port of the explosion-proof pipe valve of this left branch leg (being lower interface) is used oil duct connection shuttle valve again, and the left oil inleting port of this oil duct and shuttle valve joins; Offer interface and use the explosion-proof pipe valve of the right supporting leg of oil duct connection at the rodless cavity of right withstand leg oil cylinder, end face hydraulic fluid port on this oil duct and the explosion-proof pipe valve of right supporting leg (going up interface) joins, and pipeline hydraulic fluid port (being lower interface) that should the explosion-proof pipe valve of right side supporting leg is used oil duct connection shuttle valve again, and the right oil inlet of this oil duct and shuttle valve joins; When booster took place, the explosion-proof pipe valve of this left and right supporting leg can prevent the pressure oil leakage in the left and right withstand leg oil cylinder rodless cavity and make this support oil cylinder sink to causing the lifting vehicle rollover automatically with the oil outlet sealing; And the effect of shuttle valve is that the pressure oil pressure in left withstand leg oil cylinder and the right withstand leg oil cylinder is bigger one and compares with the overload setup pressure value, as long as a side of lifting vehicle overloads, this overload signal will react away, makes other parts corresponding actions of this fluid pressure warning device and plays the safety guard-safeguard effect; Oil outlet (lower interface) at shuttle valve is set valve with oil duct connection overload, this oil duct joins with guide's hydraulic fluid port (left interface) that overload is set valve, overload is set the oil pipe connection fuel tank of the return opening (promptly going up interface) of valve with the band cutoff port, the leakage hydraulic fluid port that this overload is set valve joins by the return opening (promptly going up interface) of oil duct with overload setting valve, the oil inlet (being lower interface) of this overload setting valve is restarted valve with oil duct connection overload, this oil duct joins with the main return opening (being lower interface) that overload is restarted valve, it is a two-position two-way hydraulic control change-over valve that this overload is set valve, reset by adjustable spring, when hydraulic coupling during greater than the spring setting value, overload is set valve in the work of position, a left side, be communicated with up and down, be in opening, otherwise, be not communicated with up and down in the work of right position, be in closed condition, on the oil circuit of overload setting valve connected tank restriction is arranged, work to reduce hydraulic efficiency impact, overload is set the leakage oil connected tank of valve; The off-load hydraulic fluid port (being the lower-left interface) that this overload is restarted valve is received fuel tank by oil pipe, the oil inlet (go up interface) that overload is restarted valve joins by the oil outlet of oil duct and check valve, the oil inlet of check valve is connected with the rodless cavity of oil pump (being pressure source) and action tank simultaneously by oil duct, it is a two-position three way pressure reduction liquid controlled reversing steel ball stopper ring that this overload is restarted valve, right bit strip safety switch, during the manual unlocking safety switch, overload is restarted valve in the work of right position, must open safety switch before portable lifting vehicle operating, it is that the depended on pressure difference commutates to the work of position, a left side that this overload is restarted valve; Overload is restarted valve in the work of position, the right side under the mode of operation that does not have to overload at vehicle, and safety switch is in opening, and owing to overload setting valve is not opened, pressure oil is restarted in overload not to be had in the valve to flow, and does not produce pressure reduction, so can not commutate; When overload takes place in vehicle; overload is set opening of valves; overload is restarted and is produced difference of pressure before and after the valve and make overload restart valve to commutate to the work of position, a left side; oil pump (direct or indirect the acting on herein of pressure oil that oil pump produces; being referred to as pressure source again) the operation pressure oil and the fuel tank that produce connect; action tank can not be done the lifting action again; operating personal must reopen safety switch; portable lifting vehicle ability normal operation; check valve can prevent that pressure oil from blowing back into action tank; prevent misoperation; shielded oil circuit also can be two or more, and when one tunnel oil-feed, pressure oil can not flow into other loop and cause other actr actions like this; this overload is set valve; overload restarts valve and check valve can be contained on the integral valve piece, and passing hole channel comes corresponding the connection each other.

The fluid pressure warning device that the portable lifting vehicle overload that the utility model proposed is restarted; rational in infrastructure; easy to operate, be swift in response, defencive function is strong; the monitoring overload accurately; overload finds that easily cost is lower, makes that simultaneously whole hydraulic efficiency pressure system is more perfect; need of work is satisfied in hommization better.

The fluid pressure warning device of the portable lifting vehicle overload that the utility model proposed being restarted below in conjunction with drawings and Examples is described further

Description of drawings

Fig. 1 is the hydraulic schematic diagram of portable lifting vehicle overload that the utility model the proposes fluid pressure warning device of restarting.

Among Fig. 1: 1, action tank 2, check valve 3, fuel tank 4, overload are restarted valve 5, the explosion-proof pipe valve 6 of left branch leg, shuttle valve 7, left withstand leg oil cylinder 8, overload setting valve 9, the explosion-proof pipe valve 10 of right supporting leg, right withstand leg oil cylinder 11, oil pump

Specific implementation method

As can be seen from Figure 1: the fluid pressure warning device that a kind of portable lifting vehicle overload is restarted comprises fuel tank 3, oil pump 11 (being pressure source), action tank 1 (being jack cylinder), left withstand leg oil cylinder 7 and right withstand leg oil cylinder 10; This left side withstand leg oil cylinder 7 and right withstand leg oil cylinder 10 are to the most direct position of overload reaction in the portable lifting vehicle, it is characterized in that comparing by the safe pressure setting value that pressure maxim in the pressure oil of left withstand leg oil cylinder 7 and right withstand leg oil cylinder 10 rodless cavities and overload are set in the valve 8, when lifting overloads, pressure oil and fuel tank 3 that the overload action is required are connected, the overload action can not be carried out, thereby play the effect of safety guard-safeguard, offer interface and use the explosion-proof pipe valve 5 of oil duct connection left branch leg at the rodless cavity of left withstand leg oil cylinder 7, end face hydraulic fluid port on the explosion-proof pipe valve 5 of this oil duct and left branch leg (going up interface) joins, and the pipeline hydraulic fluid port of the explosion-proof pipe valve 5 of this left branch leg (being lower interface) is used oil duct connection shuttle valve 6 again, and the left oil inleting port of this oil duct and shuttle valve 6 joins; Offer interface and use the explosion-proof pipe valve 9 of the right supporting leg of oil duct connection at the rodless cavity of right withstand leg oil cylinder 10, end face hydraulic fluid port on the explosion-proof pipe valve 9 of this oil duct and right supporting leg (going up interface) joins, and pipeline hydraulic fluid port (being lower interface) that should the explosion-proof pipe valve 9 of right side supporting leg is used oil duct connection shuttle valve 6 again, and the right oil inlet of this oil duct and shuttle valve 6 joins; When booster took place, the explosion-

proof pipe valve

5,9 of this left and right supporting leg can prevent the pressure oil leakage in left and right withstand leg oil cylinder 7,10 rodless cavities and make this support oil cylinder sink to causing the lifting vehicle rollover automatically with the oil outlet sealing; And the effect of shuttle valve 6 is that the pressure oil pressure in left withstand leg oil cylinder 7 and the right withstand leg oil cylinder 10 is bigger one and compares with the overload setup pressure value, as long as a side of lifting vehicle overloads, this overload signal will react away, makes other parts corresponding actions of this fluid pressure warning device and plays the safety guard-safeguard effect; Oil outlet (lower interface) at shuttle valve 6 is set valve 8 with oil duct connection overload, this oil duct joins with guide's hydraulic fluid port (left interface) that overload is set valve 8, overload is set the oil pipe connection fuel tank 3 of the return opening (promptly going up interface) of valve 8 with the band cutoff port, the leakage hydraulic fluid port that this overload is set valve 8 joins by the return opening (promptly going up interface) of oil duct with overload setting valve 8, the oil inlet (being lower interface) of this overload setting valve 8 is restarted valve 4 with oil duct connection overload, this oil duct joins with the main return opening (being lower interface) that overload is restarted valve 4, it is two-position two-way hydraulic control change-over valves that this overload is set valve 8, reset by adjustable spring, when hydraulic coupling during greater than the spring setting value, overload is set valve 8 in the work of position, a left side, be communicated with up and down, be in opening, otherwise, be not communicated with up and down in the work of right position, be in closed condition, on the oil circuit of overload setting valve 8 connected tanks 3 restriction is arranged, work to reduce hydraulic efficiency impact, overload is set the leakage hydraulic fluid port connected tank 3 of valve 8; The off-load hydraulic fluid port (being the lower-left interface) that this overload is restarted valve 4 is received fuel tank 3 by oil pipe, the oil inlet (upper right interface) that overload is restarted valve 4 joins by the oil outlet of oil duct and check valve 2, the oil inlet of check valve 2 is connected with the rodless cavity of oil pump 11 (being pressure source) and action tank 1 simultaneously by oil duct, it is two-position three way pressure reduction liquid controlled reversing steel ball stopper rings that this overload is restarted valve 4, right bit strip safety switch, during the manual unlocking safety switch, overload is restarted valve 4 in the work of right position, must open safety switch before portable lifting vehicle operating, it is that the depended on pressure difference commutates to the work of position, a left side that this overload is restarted valve 4; Overload is restarted valve 4 in the work of position, the right side under the mode of operation that does not have to overload at vehicle, and safety switch is in opening, and owing to overload setting valve 8 is not opened, pressure oil is restarted valve in overload not to be had for 4 li to flow, and does not produce pressure reduction, so can not commutate; When overload takes place in vehicle; overload is set valve 8 and is opened; overload is restarted valve 4 front and back and is produced difference of pressure and make overload restart valve 4 to commutate to the work of position, a left side; oil pump 11 (direct or indirect the acting on herein of pressure oil that oil pump produces; being referred to as pressure source again) the operation pressure oil and the fuel tank 3 that produce connect; action tank 1 can not be done the lifting action again; operating personal must reopen safety switch; portable lifting vehicle ability normal operation; check valve 2 can prevent that pressure oil from blowing back into action tank 1; prevent misoperation; shielded oil circuit also can be two or more, and when one tunnel oil-feed, pressure oil can not flow into other loop and cause other actr actions like this; this overload is set valve 8; overload restarts valve 4 and check valve 2 can be contained on the integral valve piece, and passing hole channel comes corresponding the connection each other.

Claims

1. the fluid pressure warning device that portable lifting vehicle overload is restarted comprises fuel tank (3), oil pump (11), action tank (1), left withstand leg oil cylinder (7) and right withstand leg oil cylinder (10); It is characterized in that

A, offer interface and with the oil duct explosion-proof pipe valve of connection left branch leg (5) at the rodless cavity of left withstand leg oil cylinder (7), end face hydraulic fluid port on the explosion-proof pipe valve of this oil duct and left branch leg (5) joins, and the pipeline hydraulic fluid port of the explosion-proof pipe valve of this left branch leg (5) is used oil duct connection shuttle valve (6) again, and the left oil inleting port of this oil duct and shuttle valve (6) joins; Offer interface and use the right explosion-proof pipe valve of supporting leg (9) of oil duct connection at the rodless cavity of right withstand leg oil cylinder (10), end face hydraulic fluid port on this oil duct and the explosion-proof pipe valve of right supporting leg (9) joins, and pipeline hydraulic fluid port that should the explosion-proof pipe valve of right side supporting leg (9) is used oil duct connection shuttle valve (6) again, and the right oil inlet of this oil duct and shuttle valve (6) joins;

B, set valve (8) with oil duct connection overload at the oil outlet of shuttle valve (6), this oil duct joins with guide's hydraulic fluid port that overload is set valve (8), the leakage hydraulic fluid port that this overload is set valve (8) joins by the return opening on oil duct and the overload setting valve (8), overload is set the oil pipe connection fuel tank (3) of the return opening of valve (8) with the band cutoff port, the oil inlet of this overload setting valve (8) is restarted valve (4) with oil duct connection overload, and the main return opening that this oil duct and overload are restarted valve (4) joins;

C, the off-load hydraulic fluid port of restarting valve (4) that transships are received fuel tank (3) by oil pipe, the oil inlet that overload is restarted valve (4) joins by the oil outlet of oil duct and check valve (2), and the oil inlet of check valve (2) by oil duct simultaneously and the connection of the rodless cavity of oil pump (11) and action tank (1).

2. the fluid pressure warning device that portable lifting vehicle overload according to claim 1 is restarted is characterized in that it is a two-position two-way hydraulic control change-over valve that this overload is set valve (8).

3. the fluid pressure warning device that portable lifting vehicle overload according to claim 1 is restarted is characterized in that it is a two-position three way pressure reduction liquid controlled reversing steel ball stopper ring that this overload is restarted valve (4).

4. the fluid pressure warning device that portable lifting vehicle overload according to claim 1 is restarted is characterized in that overload is set valve (8), overload is restarted valve (4) and check valve (2) is contained on the integral valve piece, and passing hole channel comes corresponding the connection each other.