CN2194897Y - Protecting device for mining hoist - Google Patents

Abstract

The utility model relates to a glide protecting device for a mining hoist, which relates to the field of the glide protection of the mining hoist. As long as glide occurs, no matter because of lack of braking torque caused by braking system or relative lack of braking torque caused by overloading, no matter because of the failure of the hydraulic valve in the spinning station or the failure of the electric unit in the spinning station, and no matter because of the glide caused in normal operation, rope adjusting operation or rope exchanging operation, the glide protecting device for the mining hoist can detect the glide automatically, automatically enables the primary braking system to put in operation completely, and automatically adds an extra braking torque to a disc type holding brake by a tertiary braking method to prevent from the glide of the mining hoist. The glide protecting device for a mining hoist mainly comprises a hydraulic part driving system and an electric control system-box body, and is mainly used in the mining hoist with a disc braking system.

Description

Protecting device for mining hoist

The utility model relates to mine hoist and amplifies sliding protection field.

At present, the disk braking system of forming by how secondary dish brake that mine hoist mostly uses, utilize the disk spring of dish brake piston back cavity to brake, the pressure oil that relies on the Hydraulic Station adjusting to enter the dish brake ante-chamber declutches and changes lock torque, owing to the possibility that whole plate disc brakies are malfunctioning is minimum, therefore, under general situation, has higher safe reliability, editing " mine hoist equipment " as version China Mining College in 1980 writes, have advantages such as safety performance is good, therefore obtained using comparatively widely.But we will see that also mine hoist is to work under the changeable working environment of situation, " analysis of mine hoist pulleying thing ore deposit " literary composition of mining machinery publication can be seen from 1992 the 12nd phases, the lifting load overload, drg is cranky, factors such as Hydraulic Station and electric part thereof are out of order whole or the part come out the time, serious amplification will take place slip over accidents such as volume, cause the lifting container shaft bottom of falling, smash the pit shaft attendant equipment, damage electrical motor, retarder, bring massive losses to national wealth.From version in 1988, coal industry was published, and Zhang Xukui, Xue Shaoqi compile in " hoister " and see, the major cause that the sliding accident of amplification takes place has:

1, mechanical braking sytem et out of order blocks as oil circuit, and transfinite in the brake rubber block gap, the friction face oil-feed of lock, reasons such as plate disc brake disk spring fatigue.

2, promoting or transfer weight surpasses the weight of regulation and adds suitable counterweight.

3, double drum hoist is to rope, when changing rope etc. and opening power-transfer clutch and do single-hoisting and since lifting weight too big (as skip bucket) surpass the rated power square.

4, the electric liquid pressure regulating valve of Hydraulic Station, safety arrestment electromagnetic valve and corresponding electric part et out of order.

Can see thus, no matter the caused lock torque of mechanical braking sytem et out of order is too small, still make the lock torque relative deficiency because of overload, first three is planted situation and all can unify for a bit, be exactly after above-mentioned situation takes place, if can additive incrementation part moment participate in braking automatically, amplify so to slide and just can be prevented; And the 4th kind of situation obviously is because of the reliability of Hydraulic Station is not enough, and hydraulic oil is closed within the dish brake ante-chamber fully or not exclusively, causes mechanical braking sytem not drop into or drops into not thoroughly, causes and amplifies that sliding accident takes place.

The purpose of this utility model, no matter be to cause lock torque not enough because of the brake system reason, still make the lock torque relative deficiency because of overload, no matter be Hydraulic Station internal hydraulic pressure valve et out of order, or internal electric part et out of order, no matter be in normal running, still transferring rope to change the rop exercise work, as long as take place to amplify sliding, just can detect automatically, automatically improve the reliability that former brake system drops into fully, automatically increase additional automatic moment, stop the generation of amplifying sliding accident to dish brake.

Content of the present utility model mainly contains power hydraulic system, electric control system and the casing composition of depositing these parts.Power hydraulic system mainly contains the oil sump tank oil circuit of two-position two-way solenoid valve control and is controlled by two-position four-way solenoid valve, and provides the oil circuit of pressure oil to form to the disk spring chamber.The oil circuit of two two-position two-way solenoid valve controls links to each other with the B pipe by the A pipe that external hydraulic pressure plug and dish brake ante-chamber communicate respectively, in case dish brake ante-chamber hydraulic oil is enclosed in the inside fully or not exclusively, has improved the reliability that former brake system drops into fully; Two two-position four-way solenoid valves of control presssure oil circuit brake the oil outlet of oil pumps with two of Hydraulic Station respectively by external hydraulic pressure plug and the oil inlet of electric liquid pressure regulating valve links to each other, because work of two pumps, one standby, their work conversion for convenience, and the pressure oil that provides to the disk spring chamber pins, and is respectively equipped with hydraulic control one-way valve in the two-position four-way valve exit that leads to this pressure oil circuit; In addition, on this oil circuit, also be provided with by pass valve, guarantee the safety of system, also can provide pressure oil to adjust in addition dish-shaped chamber so that the unnecessary liquid that oil pump is discharged can oil sump tank.Because the disk spring chamber is just to fill high pressure oil under the sliding situation of amplification, in order to guarantee fast speed rising pressure, increase additional brake moment, the fluid in disk spring chamber must all should remain full of with carving at any time, therefore unlikely loss has been provided with suck-back valve and back pressure valve on this oil circuit.In order to keep dish-shaped chamber fluid in pine, band-type brake process, a pressure stable to be arranged all, guarantee that gig braking control sensitivity does not descend, and also is provided with low pressure accumulator on this oil circuit.In addition, on this oil circuit, also annexes such as shutoff valve, compression indicator should be arranged; Electric control system mainly contains time relay, intermediate relay, compositions such as speed relay, adjustable resistance.Speed relay and adjustable resistance are connected on the loop of testing the speed of gig and control by the secondary contact of the safety relay in the mine hoist safety loop, and monitoring is under the safety arrestment precondition, and whether cylinder is also in motion, or counter-rotating again after stopping.If during this kind situation, touch with time relay and intermediate relay action, thereby reach the purpose of each electromagnetic hydraulic pressure valve events of control by speed relay.

Can see that thus the utility model has made full use of brake pump produces in the inoperative section in the Hydraulic Station pressure oil and carried out work, does not therefore have propulsion source independently; The generation of additional moment enters dish brake disk spring chamber by pressure oil and realizes, does not therefore have independently operating mechanism; Amplifying sliding detection is to rely on the loop of testing the speed of gig to realize, does not therefore have independently testing agency.So the utility model simple structure, cost is low, and the action of this device has relative independence with former hydraulic brake system, very little to former system systematic influence, and its controlling unit is not subjected to the influence of former Hydraulic Station, therefore improve former brake system greatly and dropped into fully, increased the reliability of additional brake moment.Thereby the sliding protection of the amplification of mine hoist also obtained technical reliable assurance, avoids national wealth to be subjected to the threat of heavy losses, and it has important economic benefit and social benefit.

Now accompanying drawing is made brief description.

Fig. 1 mine hoist amplifies the scheme drawing of sliding fender guard

Fig. 2 mine hoist amplifies the electric control theory figure of sliding fender guard.

Fig. 3 has plate disc brake structural development figure now.

Fig. 4 mine hoist amplifies the annexation figure of sliding protection power hydraulic system and former dish type hydraulic brake system.

Describe its principle and embodiment in detail below in conjunction with accompanying drawing.

As shown in drawings; mine hoist amplifies sliding fender guard and mainly contains: two-position four-way solenoid valve ［ 2 ］; hydraulic control one-way valve ［ 1 ］; pressure accumulator ［ 3 ］; back pressure valve ［ 4 ］; suck-back valve ［ 5 ］; safety overflow valve ［ 6 ］; compression indicator ［ 7 ］, two-position two-way solenoid valve ［ 8 ］; ［ 9 ］, external hydraulic pressure plug ［ 12 ］; ［ 13 ］; ［ 14 ］; ［ 15 ］; ［ 16 ］; ［ 17 ］; ［ 18 ］; time relay ［ 10 ］; intermediate relay ［ 19 ］; speed relay ［ 20 ］; resistance ［ 21 ］, compositions such as housing, with the annexation of Hydraulic Station as shown in Figure 4.

Because pressure oil is not filled in former dish brake disk spring chamber, therefore need do suitable improvement, so that match with this device to the structure of plate disc brake.As shown in Figure 3, on the inside and outside footpath of piston, increase a y-type seal ring ［ 21 ］, ［ 22 ］ respectively, changed former one-way sealing into two way seal; On spiral bonded assembly faying face, increase O RunddichtringO ［ 23 ］, strengthened the sealing of this faying face; In relief port place drilling screw, increase a venting again and stop up ［ 28 ］, be convenient to the sealing and the venting in disk spring chamber; The hole that is communicated with the disk spring chamber at the oil drain plug place is stopped up with plug wire ［ 27 ］; Add y-type seal ring ［ 25 ］ at the supporting mass that cooperates with disk spring sleeve ［ 24 ］ work guiding, strengthen its sealing; Make orienting sleeve more in short-term as pilot sleeve ［ 24 ］, can suitably extend; The placement of pressure connection is placed the same with former pressure tube head, different just oilholes lead to dish-shaped chamber; Oil may be closed in the inside between disk spring inside, should open several apertures ［ 26 ］ on the disk spring circumference.

Under normal circumstances, the coil G4 of electromagnetic hydraulic valve ［ 2 ］, ［ 8 ］, ［ 9 ］, G5, G6 does not have electricity, and the hydraulic oil that oil pump is discharged directly enters former Hydraulic Station by ［ 2 ］, works normally and brakes.Back pressure valve ［ 4 ］, low pressure accumulator ［ 3 ］ makes dish-shaped chamber remain the fluid of certain oil pressure, improve gig braking control sensitivity, because of the existence of leaking, the pressure accumulator capacity can descend, and influences the control of braking sensitivity, and suck-back valve ［ 5 ］ is exactly in this case, cause that by band-type brake dish-shaped cavity space increases suddenly, replenish hydraulic oil to the disk spring chamber by fuel tank.

When emergency braking occurring, the safety return circuit relay AC of gig mourns, two stage braking safety valve dead electricity, elevator system has realized urgent band-type brake, time relay sj this moment ［ 10 ］ has, through time-delay (delay time is greater than the two stage braking band-type brake time), make speed relay SDJ ［ 20 ］ insert the loop of testing the speed, if cylinder is also rotating, or cylinder stop after again the counter-rotating, when the speed of cylinder is enough to make SDJ ［ 20 ］ adhesive, sliding safety electromagnetic hydraulic valve ［ 2 ］ is amplified in then intermediate relay Z ［ 19 ］ adhesive and self-insurance, ［ 8 ］, ［ 9 ］ magnet coil G4, G5, G6 has simultaneously, make two two position two-way valves ［ 8 ］, ［ 9 ］ action directly is communicated with dish brake ante-chamber oil circuit with fuel tank, guarantees that former brake system drops into braking fully, prevent because of the Hydraulic Station internal fault, cause brake system not drop into or drop into halfway situation occurring.Two-position four-way valve ［ 2 ］ also moves in addition, the high pressure oil that oil pump is produced is directly carried to the disk spring chamber by hydraulic control one-way valve ［ 1 ］, its pressure oil rolls valve ［ 6 ］ and to adjust and decide by overflowing, setting valve should never influence the intensity of used plate disc brake and consider, therefore having made full use of spring counter-force and the drg each several part that the gap produced that declutch causes that part of intensity that resistance is shared, as calculated, the oil pressure value that this part intensity is folded to the generation of dish-shaped chamber is about more than 35%～40% of maximum functional oil pressure, under this oil pressure effect, applied again in the three-stage brake mode by plate disc brake and to be about the additional brake moment of former maximum braking moment more than 35%, stoped the generation of amplifying sliding accident.

Because the utility model is the accepted standard device mostly, therefore, must reasonably select, by pass valve ［ 6 ］, two-position four-way magnet valve ［ 12 ］, hydraulic control one-way valve ［ 1 ］ should be according to the maximum functional oil pressure (also can select with reference to the brake pump operating oil pressure) in specified oil drain quantity of Hydraulic Station brake pump and disk spring chamber, and the caliber of use should export caliber with oil pump, and is consistent as far as possible.Two-position two-way solenoid valve ［ 8 ］, ［ 9 ］ should be selected according to the maximum functional oil pressure of Hydraulic Station and the diameter of A pipe B pipe, the capacity of pressure accumulator ［ 3 ］ should be a bit larger tham the total variation of each dish brake capacity in pine, band-type brake process, and pressure should be the adjustment pressure 3～5kg/cm of back pressure valve ²The suck-back valve is just with general check valve, when arranging the position of each valve, should note that compression indicator is placed on casing top or the side is convenient to watch, each valve to be convenient to adjusting of each valve by putting the position, the external hydraulic pressure plug that links to each other with Hydraulic Station is placed on a side, the external hydraulic pressure plug that links to each other with disc-brake is placed on the another side, because electric elements are less, can be placed on inboard face if allow between the casing content, can certainly be placed on the lateral surface of casing, because the pressure oil of this device is from Hydraulic Station, therefore, inconvenience is provided with fuel tank again, so it is skeleton that casing can utilize with the angle steel weldment, each face sheet steel is screwed on screw or rivet welding on get final product.Technological change as for plate disc brake mainly is to be placed on the scene to carry out, and the manufacturer can give and process the accessory that must change earlier certainly, must simpler and more directly transforming with plate disc brake existing effectively, itself and the utility model is complementary.

Claims (2)

1, a kind of mine hoist that uses that matches with the mine hoist disk braking system amplifies sliding fender guard, it is characterized in that having used oil sump tank oil circuit and two-position four-way solenoid valve [2] control by two-position two-way solenoid valve [8], [9] control, and the liquid machine driving system that is constituted to dish brake disk spring chamber delivery pressure oil circuit; Also be to have used by time relay [10] speed relay [20], the electric control system that intermediate relay [19], adjustable resistance [11] constitute; Also be to have used the casing of depositing these electric elements and Hydraulic Elements.

2, the sliding fender guard of 1 described amplification be to show as right, hydraulic control one-way valve ［ 1 ］, back pressure valve ［ 4 ］, suck-back valve ［ 5 ］ it is characterized in that also having used in the power hydraulic system, low pressure accumulator ［ 3 ］, by pass valve ［ 6 ］, compression indicator ［ 7 ］.

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