CN203906452U - Positive pressure system of hydraulic grab bucket - Google Patents

Abstract

The utility model discloses a positive pressure system of a hydraulic grab bucket. The positive pressure system is characterized by consisting of two parts, i.e. a middle-beam positive-pressure oil tank assembly (1) and an airtight motor system assembly (2), wherein the middle-beam positive-pressure oil tank assembly (1) consists of a positive pressure oil tank (3), an inflatable pressure detection valve (4), a pressure relay (5), a temperature sensor (6), a magnet device (7) and a return oil filter (8); the inflatable pressure detection valve (4), the pressure relay (5), the temperature sensor (6), the magnet device (7) and the return oil filter (8) are arranged above the oil tank; the airtight motor system assembly (2) consists of an oil pump (9), a seal pump cover (10), a coupler (11), a seal flange plate (12), a motor (13), a valve block (14) and a protective cover (15); the middle-beam positive-pressure oil tank assembly (1) and the airtight motor system assembly (2) are in seal connection together; not only is the sealing achieved, but also the system combination is realized. As the positive pressure system integrates a middle beam, the oil tank and a pressure system, the structure is compact, the system stability is good, each component is easy to change, and the phenomena of valve block blockage and oil leakage are thoroughly overcome; meanwhile, having a good dustproof ability, the system can meet working in a severe dust environment; the continuous working of the grab bucket is provided with strong guarantee; therefore the working efficiency of the hydraulic grab bucket is improved greatly, and the service life of the hydraulic grab bucket is prolonged.

Description

Hydraulic grab positive pressure system

Technical field:

The utility model relates to hydraulic work system Environmental Technology field, hydraulic grab positive pressure system specifically, it is a set of sealing fluid pressing system, be provided in the upper use of quayside container crane grab bucket, be mainly used in fall apart groceries handling of quayside container crane, can realize 120 hours continuously uninterrupted work capacities.

Background technique:

At present, traditional two lobe hydraulic grabs, owing to there is following problem, are difficult to meet daily working continuously:

1, oil leakage fault problem: because of the every pressure of system higher (the about 120bar of system pressure, the about 250-280bar of working pressure), cause the Sealing of hydraulic pressure components and parts often to damage, cause oil leakage fault to occur;

2, Issue of Hydraulic System Pollution: grab bucket continuous operation several as a child after, due to stretching of oil cylinder, cause oil tank system to produce cell breath, near and extraneous dust will enter into fuel tank naturally, system is polluted, thereby cause abrasion of hydraulic pump aggravation, there is the not even problem such as obstruction of valve piece pressure, this problem is that problem the most frequently in use appears in current hydraulic grab, the way that conventionally can only adopt oil filter regularly grab bucket hydraulic oil to be filtered and hydraulic system is cleaned solves, although this way has certain effect, but it is high to clean maintenance cost, inefficiency, more can not guarantee normally carrying out of manufacturing operation.

Model utility content:

The purpose of this utility model is the deficiency that overcomes above-mentioned prior art, and a kind of hydraulic grab positive pressure system is provided, leakage of oil when mainly solving existing hydraulic grab and working continuously, easily pollution of work system, unstable properties, valve piece easily stop up, easily worn part is not easy to change, can not meet and under the large environment of dust, work continuously and the series of problems such as operating efficiency is low.

The technical solution of the utility model is: hydraulic grab positive pressure system, and its special way is, it is comprised of central sill malleation fuel tank assembly and airtight motor system assembly two-part; Central sill malleation fuel tank assembly detects valve, pressure relay, temperature transducer, magnetite device and return oil filter by malleation fuel tank and fuel tank top inflation pressure and forms, wherein inflation pressure detection valve, pressure relay, temperature transducer and return oil filter tighten together with the reserved respective screw hole of diverse location of covering of malleation fuel tank respectively, and magnetite device is fixed on malleation fuel tank inside bottom; Described airtight motor system assembly is comprised of oil pump, canned pump cover, coupling, sealing flange, motor, valve piece, safety cover, and wherein oil pump connects with sealing flange by canned pump cover; Oil pump connects with motor by coupling; Motor and valve piece are directly connected on sealing flange respectively; At sealing flange, motor and valve piece, safety cover is installed outward; Described central sill malleation fuel tank assembly is together with sealed attachment between airtight motor system assembly.

Further, described system is positive-pressure closing group shot.

Compared with the prior art hydraulic grab positive pressure system described in the utility model has following good effect: 1, on fuel tank, increase positive pressure system, concentrate beam, fuel tank in one, successfully realized hydraulic system zero pollution that works long hours in hydraulic grab the field in; 2,, when hydraulic grab continuous high-efficient is worked, the detection early warning of pressure relay and temperature transducer in positive pressure system, can realize the work of effective prevention grab bucket overtemperature degree ultralimit, and safety in production and civil operation have been brought into play to positive role; 3, the structural design of hommization, has greatly alleviated maintenance man's labor intensity and task difficulty; 4, easily damaged parts is changed function easily, can effectively extend hydraulic grab working life, reduces waste, reduces equipment purchasing cost; 5, its integrated central sill, fuel tank and pressure system are in one, compact structure, the stability of a system is good, each parts are easy to change, valve piece stops up and oil leakage phenomenon is solved, and good system dirt exclusion capabilities of while self, can meet operation under the large environment of dust, can provide strong motivational guarantee for the continuous operation of grab bucket, greatly improve working efficiency and the working life of hydraulic grab.

Accompanying drawing explanation:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the structural representation of central sill malleation fuel tank assembly of the present utility model;

Fig. 3 is the structural representation of airtight motor system assembly of the present utility model.

Embodiment:

For Comprehension and Implementation better, below in conjunction with accompanying drawing, provide specific embodiment and describe the utility model in detail; Illustrated embodiment is only for explaining the utility model, not for limiting scope of the present utility model.

Embodiment 1, referring to Fig. 1,2,3, inflation pressure detection valve 4, pressure relay 5, temperature transducer 6 and return oil filter 8 are installed by the bolton with seal ring in the reserved respective threaded hole site of diverse location of covering at malleation fuel tank 3, at the fixing magnetite device 7 of the inside bottom of malleation fuel tank 3, form central sill malleation fuel tank assembly 1; Oil pump 9 is connected with sealing flange 12 by canned pump cover 10, oil pump 9 connects with motor 13 by coupling 11 simultaneously, again motor 13 and valve piece 14 are directly connected in respectively on sealing flange 12, at the outer installation safety cover 15 of sealing flange 12, motor 13 and valve piece 14, form airtight motor system assembly 2; Finally by central sill malleation fuel tank assembly 1 with between airtight motor system assembly 2 by together with seal ring and Bolt Connection; Form positive-pressure closing group shot.

Hydraulic grab positive pressure system described in the utility model, its working principle is: before using first, first in malleation fuel tank, refuel to predetermined range, by inflation pressure, detecting valve connection inflation steel cylinder is afterwards that positive pressure system is pressurized to specified value, and during inflation, oil cylinder is in retracted state, stop after inflation, and set pressure relay, check that whether normal each portion connects, see; The energising of no problem system, connects and drives oil pump rotation when motor, and two selector valves are in initial bit, and now oil cylinder there is no any action, oil hydraulic pump only suck maintain lubricated and in the oil mass of letting out.Because grab bucket is S6 duty, drive motor and oil pump are a direction all the time, and the to-and-fro motion of lift cylinder is controlled by " oil cylinder a stretches out " selector valve and " oil cylinder contraction " selector valve.When system has load feedback, oil pump is switched to peak rate of flow output; Load disconnects from system, oil pump get back to maintain lubricated and in the oil mass of letting out; When system works pressure reaches the numerical value that relief valve sets, oil pump also by get back to maintain lubricated and in the oil mass of letting out.Because operating load pressure constantly raises and changes, therefore the output of oil pump also need be along with continuous adjusting, like this through again and again running for a long time, oil temperature also raises gradually, when oil temperature reaches temperature transducer setting temperature, temperature transducer sender, system alarm, operator shuts down, to protect oil product and system components and parts; Because the flexible fuel tank internal that makes of oil cylinder produces moment cell breath, system pressure is reduced gradually, through long time running; when tank pressure is reduced to set pressure, pressure relay sender, system alarm; operator shuts down or forced stoppage, in case locking system is polluted.Now, check oil level, and repairing as requested, to fuel tank the inside make-up gas to authorized pressure, then entering new circulation afterwards, this system is simple to operate, can provide strong motivational guarantee for the continuous operation of grab bucket.

Claims (2)

1. hydraulic grab positive pressure system, is characterized in that, it is comprised of central sill malleation fuel tank assembly (1) and airtight motor system assembly (2) two-part; Central sill malleation fuel tank assembly (1) detects valve (4), pressure relay (5), temperature transducer (6), magnetite device (7) and return oil filter (8) by malleation fuel tank (3) and fuel tank top inflation pressure and forms, wherein inflation pressure detection valve (4), pressure relay (5), temperature transducer (6) and return oil filter (8) tighten together with the reserved respective screw hole of diverse location of covering of malleation fuel tank (3) respectively, and magnetite device (7) is fixed on malleation fuel tank (3) inside bottom; Described airtight motor system assembly (2) is comprised of oil pump (9), canned pump cover (10), coupling (11), sealing flange (12), motor (13), valve piece (14), safety cover (15), and wherein oil pump (9) connects with sealing flange (12) by canned pump cover (10); Oil pump (9) connects with motor (13) by coupling (11); Motor (13) is directly connected in respectively on sealing flange (12) with valve piece (14); Safety cover (15) is installed outside sealing flange (12), motor (13) and valve piece (14); Described central sill malleation fuel tank assembly (1) is together with sealed attachment between airtight motor system assembly (2).

2. hydraulic grab positive pressure system according to claim 1, is characterized in that, described system is positive-pressure closing group shot.