CN104148156B - Hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof - Google Patents
Hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof Download PDFInfo
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- CN104148156B CN104148156B CN201410410444.2A CN201410410444A CN104148156B CN 104148156 B CN104148156 B CN 104148156B CN 201410410444 A CN201410410444 A CN 201410410444A CN 104148156 B CN104148156 B CN 104148156B
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Abstract
A kind of hydraulic pressure ball-type segmentation soft start of the present invention and overload protection arrangement, comprise jaw crusher frame, the eccentric shaft be installed in frame, flywheel and belt pulley, eccentric shaft is set with belt pulley by the first bearing shell, be set with by the second bearing shell and drivenly hold ball dish, belt pulley is connected with and initiatively holds ball dish; Initiatively hold ball dish and driven holding between ball dish is provided with cut spring, initiatively hold on ball dish and the driven end face holding ball dish and be equipped with 8 square nest ball, be respectively charged into initiatively power transmission steel ball and driven power transmission steel ball in nest ball, and adopted respectively and initiatively hold back ball and driven ball of holding back seals; The driven circumferential surface holding ball dish has drive sleeve and annular cylinder by splined, is provided with and can withstands the driven annular piston holding a side end face of ball dish in drive sleeve and annular cylinder.Reliable operation of the present invention, is quick on the draw to overload, and clutch is rapid, and is convenient to discharge non-broken thing, and cost is low.
Description
Technical field
The present invention relates to a kind of Machine guarding, be specifically related to a kind of be applied to jaw crusher hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof.
Background technology
Jaw crusher is a kind of engineering machinery be widely used in the industries such as ore dressing, construction material, silicate and chemistry.As shown in Figure 1, the fragmentation of material is at moving jaw plate with determine to carry out between jaw.Moving jaw plate makes periodic wobble around suspension axle to fixed jaw.When dynamic jaw is near fixed jaw, the ore be positioned between two jaws is broken.When dynamic jaw leaves fixed jaw, broken ore under gravity, is discharged through gape.At present, jaw crusher is most widely used only has two profiles formula: dynamic jaw is made simple crank double rocker mechanism jaw crusher Fig. 1 (a) swung and made the complicated crank and rocker mechanism jaw crusher 1 (b) swung with dynamic jaw.
Jaw crusher belongs to large inertia equipment, and namely due to inertia resistance, electric motor starting power is much larger than normal operation power, and starting current is 7 ~ 8 times of normal operating current.In addition, its live load fluctuation is larger, especially, when falling into non-broken thing in crusher chamber, when broken thing as non-in the bucket tooth of excavator, the drill bit of rig and other metal makes equipment be blocked suddenly, the peakload of moment is caused to produce enormous impact to equipment itself and electrical system thereof.So to design in jaw crusher be quick on the draw, the overload protection of reliable operation and soft starter device.Traditional soft start and overload protection arrangement mainly contain three kinds of forms such as fluid-flywheel clutch, safe bracket, hydraulic pressure.
Fluid-flywheel clutch is the usual means improving large inertia equipment starting performance, but cannot realize disintegrating machine segmentation soft start, limited to the improvement of motor starting performance, only for small-power jaw crusher; Safe bracket protective device usually offers hole or groove on the safe bracket be made up of plain cast iron.When disintegrating machine exceedes normal duty, safe bracket fractures immediately, and machine is quit work, thus avoids machine main parts size to damage.The maximum shortcoming of this overload protection arrangement is insensitive to overload reaction.In addition, bracket spended time is changed also longer.Hydraulic pressure overload protective comprises hydraulic connecting rod formula and hydraulic friction clutches formula two kinds.Although the first device can make disintegrating machine realize overload protection, two sections of startings only can be realized.The second device is insensitive to overload reaction, and complex structure.
Summary of the invention
Goal of the invention: the object of the invention is to solve the deficiencies in the prior art, provide a kind of be applied to jaw crusher hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof.
Technical scheme: a kind of hydraulic pressure ball-type segmentation soft start of the present invention and overload protection arrangement, comprise jaw crusher frame, the eccentric shaft be installed in frame, be installed on flywheel on eccentric shaft and belt pulley, described eccentric shaft is set with belt pulley by the first bearing shell, be set with by the second bearing shell and drivenly hold ball dish, belt pulley is connected with and initiatively holds ball dish; Describedly initiatively hold ball dish and driven holding between ball dish is provided with cut spring, initiatively hold on ball dish and the driven end face holding ball dish and be equipped with 8 square nest ball, be respectively charged into initiatively power transmission steel ball and driven power transmission steel ball in nest ball, and adopted respectively and initiatively hold back ball and driven ball of holding back seals; The described driven circumferential surface holding ball dish has drive sleeve and annular cylinder by splined, is provided with and can withstands the driven annular piston holding a side end face of ball dish in drive sleeve and annular cylinder.
Above-mentioned cut spring can guarantee initiatively to hold ball dish and the driven ball dish that holds is in released state before jaw crusher starts; When jaw crusher works, under the thrust of annular piston, initiatively hold ball dish and drivenly hold ball dish and corresponding initiatively power transmission steel ball and driven power transmission steel ball staggered pressing is combined as a whole in opposite directions, and then driving belt pulley, flywheel and eccentric shaft servo-actuated.
Further, described drive sleeve and annular cylinder are also connected on eccentric shaft by flat key, and are axially fixed at eccentric shaft by card key.
Further, one end of described eccentric shaft is connected with bearing, and the opposite side of bearing installs revolution fuel-intake connection, and revolution fuel-intake connection is furnished with seal cover, and revolution fuel-intake connection is connected with drive sleeve and annular cylinder by oil pipe, and drive sleeve and annular cylinder are also furnished with annular cylinder lid.
Above-mentioned revolution fuel-intake connection can guarantee that eccentric shaft turns round, that is: when jaw crusher works, by hydraulic system to ring heart oil cylinder fuel feeding for whole protective device provides power.
Further, described frame is provided with cooling duct, and when jaw crusher works, cooling duct can be enforceable by belt pulley and initiatively hold the cooling air of the some air vents on the end face of ball dish to active power transmission Steel ball conveyor abundance continuously.
For convenience of oiling, described side of initiatively holding near cooling duct on ball dish is also provided with oil filler plug.
At the other end of jaw crushing eccentric drive shaft; be symmetrically installed with identical soft start and overload protection arrangement; flywheel also can be combined with eccentric shaft according to predetermined segmentation starting sequence, start with the entirety completing jaw crusher and reduce impact load when transshipping.
The invention also discloses the control system of a kind of hydraulic pressure ball-type segmentation soft start and overload protection arrangement, comprise hydraulic pump, the side of described hydraulic pump is provided with main overflow valve and bi-bit bi-pass solenoid directional control valve successively, the opposite side of hydraulic pump is connected with check valve, the opposite side of check valve is parallel with two proportional velocity regulating valves, the opposite side of two proportional velocity regulating valves is in series with two position, three-way electromagnetic change valve and accumulator all successively, between described two accumulators, two buffer overflow valves are installed, the opposite side of buffer overflow valve is separately installed with belt pulley annular hydraulic cylinder and flywheel annular hydraulic cylinder, also pressure switch is provided with between belt pulley annular hydraulic cylinder and buffer overflow valve.
Wherein, main overflow valve can throttling, speed governing, loop voltage stabilizing and make hydraulic pump off-load; The compression shock in control system can be absorbed with accumulator; And buffer overflow valve plays the effect of overload overflow; Proportion of utilization flow speed control valve can make jaw crusher start acceleration by predetermined rule, realizes the optimization of starting process.
Beneficial effect: compared with prior art, the present invention has the following advantages:
(1) in the present invention initiatively hold ball dish and the driven ball dish that holds adopts ball-type (initiatively power transmission steel ball and driven power transmission steel ball) clutch, reliable operation, is quick on the draw to overload, and clutch is rapid, and is convenient to discharge non-broken thing;
(2) hydraulic control system in the present invention is conducive to absorbing the shock and vibration in disintegrating machine work, and starting process can optimal control;
(3) the present invention is provided with cooling duct, successional conveying can force cooling air, be conducive to reducing drive failures, increase the service life;
(4) structure of the present invention is simple, and installation and maintenance is convenient, and cost is low.
Accompanying drawing explanation
Fig. 1 (a) is the simple crank double rocker mechanism jaw crusher schematic diagram swung of dynamic jaw work in prior art;
Fig. 1 (b) is the complicated crank and rocker mechanism jaw crusher schematic diagram swung of dynamic jaw work in prior art;
Fig. 2 is structural representation of the present invention;
Fig. 3 be in Fig. 2 A-A to sectional view;
Fig. 4 is control system figure in the present invention;
Fig. 5 is the transmission schematic diagram in the present invention initiatively between power transmission steel ball and driven power transmission steel ball.
Detailed description of the invention
Below technical solution of the present invention is described in detail by reference to the accompanying drawings.
As shown in Figures 2 and 3, a kind of hydraulic pressure ball-type segmentation soft start of the present invention and overload protection arrangement, comprise jaw crusher frame 20, the eccentric shaft 21 be installed in frame 20, the flywheel 22 being installed on eccentric shaft 21 and belt pulley 16, eccentric shaft 21 is set with belt pulley 16 by the first bearing shell 19, be set with by the second bearing shell 24 and hold that ball dish is driven holds ball dish 9, belt pulley 16 is connected with and initiatively holds ball dish 14; Initiatively hold ball dish 14 and driven holding between ball dish 9 is provided with cut spring 15, initiatively hold on ball dish 14 and the driven end face holding ball dish 9 and be equipped with 8 square nest ball, be respectively charged into initiatively power transmission steel ball 13 and driven power transmission steel ball 10 in nest ball, and adopted respectively and initiatively hold back ball 12 and driven ball 11 of holding back seals; The driven circumferential surface holding ball dish 9 has drive sleeve and annular cylinder 8 by splined, is provided with and can withstands the driven annular piston 7 holding a side end face of ball dish 9 in drive sleeve and annular cylinder 8.
Wherein, each holds back ball should guarantee that corresponding power transmission steel ball can not come off from nest ball, and the spheroid also will guaranteeing to be slightly less than 1/2nd protrudes corresponding drive plate end face.
Above-mentioned cut spring 15 can guarantee initiatively to hold ball dish 14 and the driven ball dish 9 that holds is in released state before jaw crusher starts; When jaw crusher works, under the thrust of annular piston 7, initiatively hold ball dish 14 and drivenly hold ball dish 9 and corresponding initiatively power transmission steel ball 13 and driven power transmission steel ball 10 staggered pressing is combined as a whole in opposite directions, and then driving belt pulley 16, flywheel 22 and eccentric shaft 21 servo-actuated.
Drive sleeve and annular cylinder 8 are also connected on eccentric shaft 21 by flat key 23, and are axially fixed at eccentric shaft 21 by card key 5.One end of eccentric shaft 21 is connected with bearing 3, the opposite side of bearing 3 installs revolution fuel-intake connection 1, revolution fuel-intake connection 1 is furnished with seal cover 2, and revolution fuel-intake connection 1 is connected with drive sleeve and annular cylinder 8 by oil pipe 4, and drive sleeve and annular cylinder 8 are also furnished with annular cylinder lid 6.Wherein, revolution fuel-intake connection 1 can guarantee that eccentric shaft 21 turns round, that is: when jaw crusher works, by hydraulic system to drive sleeve and ring heart oil cylinder 8 fuel feeding for whole protective device provides power.
Frame 20 in the present embodiment is provided with cooling duct 18, and when jaw crusher works, cooling duct 18 enforceablely continuously can carry sufficient cooling air by belt pulley 16 and the some air vents initiatively held on the end face of ball dish 14 to active power transmission steel ball 13.
For convenience of oiling, the side of initiatively holding near cooling duct 18 on ball dish 14 is also provided with oil filler plug 17.
At the other end of jaw crushing eccentric drive shaft 21; be symmetrically installed with identical soft start and overload protection arrangement; flywheel 22 also can be combined with eccentric shaft 21 according to predetermined segmentation starting sequence, start with the entirety completing jaw crusher and reduce impact load when transshipping.
As shown in Figure 4, the control system of a kind of hydraulic pressure ball-type segmentation soft start of the present invention and overload protection arrangement, comprise hydraulic pump 25, the side of hydraulic pump 25 is provided with main overflow valve 27 and bi-bit bi-pass solenoid directional control valve 26 successively, the opposite side of hydraulic pump 25 is connected with check valve 28, the opposite side of check valve 28 is parallel with two proportional velocity regulating valves 29, the opposite side of two proportional velocity regulating valves 29 is in series with two position, three-way electromagnetic change valve 30 and accumulator 35 all successively, two buffer overflow valves 34 are installed between two accumulators 35, the opposite side of buffer overflow valve 34 is separately installed with belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33, pressure switch 36 is also provided with between belt pulley annular hydraulic cylinder 32 and buffer overflow valve 34.
Wherein, main overflow valve 27 can throttling, speed governing, loop voltage stabilizing and make hydraulic pump 25 off-load; The compression shock in control system can be absorbed with accumulator 35; And buffer overflow valve 34 plays the effect of overload overflow; Proportion of utilization flow speed control valve 29 can make jaw crusher start acceleration by predetermined rule, realizes the optimization of starting process.
Specific works principle of the present invention is as follows:
(1) realization of syllogic soft start
As shown in Figure 4, at jaw crusher prestart, first make electromagnet 1DT obtain electric, 2DT and 3DT dead electricity, hydraulic pump 25 starting under no load, now belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33 be all in pressure release state.In Fig. 2, active tray 14 is separated with the driven ball dish 9 that holds by cut spring 15, starts jaw crusher main motor drive pulley 16 relative eccentric axle 21 and dallies, and now completes first paragraph and starts.
Electromagnet 1DT and 2DT is made to obtain subsequently electric, two position, three-way electromagnetic change valve 30 is in left position, accumulator 35 topping up, pressure oil also enters belt pulley annular hydraulic cylinder 32 rodless cavity simultaneously, and promote drivenly to hold spring force that ball dish 9 overcomes cut spring 15 and be combined with initiatively tray 14, make the active power transmission steel ball 13 of the two end face and the rear unitary rotation of the staggered compression of driven power transmission steel ball 10, eccentric shaft 21 starts to rotate immediately, so far completes second segment and starts.
Along with belt pulley 16, eccentric shaft 21 and driving disintegrating machine moving jaw plate thereof are started working, hydraulic system pressure increases, it is electric that pressure switch 36 sender makes electromagnet 3DT obtain, after pressure oil enters flywheel annular hydraulic cylinder 33, flywheel 22 also rotates with eccentric shaft 21 and belt pulley 16, now the 3rd section of starting completes, thus whole Soft Start-up Process terminates.
Regulate the size of area of passage of proportional velocity regulating valve 29, thus change the flow entering belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33, so namely can control belt pulley 16 and eccentric shaft 21 and flywheel 22 and eccentric shaft 21 in conjunction with speed.Adoption rate formula controls, can by predetermined speed Changing Pattern, as after first slow soon or at the uniform velocity etc., belt pulley 16 and eccentric shaft 21 and flywheel 22 are combined with eccentric shaft 21 under minimal impact load, realize optimum soft start.
(2) implementation procedure of overload protection
In jaw crusher work, with object to be broken sum firmness change, hydraulic system pressure is fluctuated comparatively large, when pressure peak does not reach the setting of buffer overflow valve 34, accumulator 35 plays the effect of Absorbing hydraulic pulsation.When crusher chamber falls into non-broken thing, when namely crossing iron, pressure reaches buffer overflow valve 34 setting, and buffer overflow valve 34 opens overflow, limits the further increase of hydraulic system pressure.When non-broken thing is not discharged; hydraulic system pressure remains on the setting of buffer overflow valve 34 always; motor overheating must be caused; make pressure switch 36 sender in control system, electromagnet 1DT and 2DT dead electricity, belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33 rodless cavity are linked back fuel tank; initiatively tray 14 is separated with the driven ball dish 9 that holds; belt pulley 16 and flywheel 22 dally, and disintegrating machine quits work, and then realizes overload protection.Also cut off power chain while overload protection, be conducive to like this discharging non-broken thing.
For ensureing the reliability service of soft start in the present invention and overload protection arrangement; must choose reasonable and be designed with related parameter, comprise the number of initiatively power transmission steel ball 13 and driven power transmission steel ball 10 and diameter, initiatively hold back ball 12 and driven hold back ball 11 hold back a mouthful diameter, active tray 14 and the driven diameter, the effective work area of annular cylinder etc. holding ball dish 9.Wherein, initiatively the number of power transmission steel ball 13 and driven power transmission steel ball 10 and diameter particularly important.According to the working condition of each power transmission steel ball, can be impacted and be worn and torn in its surface.
When main consideration impact loading, as shown in Figure 5, with reference to the Strength co-mputation of splined, determine each power transmission steel ball size and number by shear fails form:
Wherein, Tc is disintegrating machine calculating torque; ψ represents the uneven coefficient of load distribution, and relevant with force transfer ball number, its span is 0.7 ~ 0.8; Z is power transmission steel ball number, when transmitting torque is larger, is usually no less than 8;
Dm is the distance of power transmission steel ball contact point c to eccentric shaft 21 center line; Sc was the Guang area of section of power transmission steel ball contact point c; [τ
p] refer to the shear stress a allowable of power transmission steel ball material.
(1) in formula, Sc comprises the information about each power transmission steel ball size, so first select its number z, then calculates force transfer ball diameter d according to (1) formula.
When determining its number and diameter when losing efficacy by each power transmission worn steel ball, calculate with reference to relevant contact strength between gear and tooth face:
In formula, Fn refers to the normal force of power transmission steel ball,
As shown in Figure 4,
and
in formula, ψ with Dm is identical with (1) formula meaning; ρ
Σrefer to composite curve radius,
ρ 1=ρ 2=d/2 herein; L is contact line length between active power transmission steel ball 13 and driven power transmission steel ball 10; Z
Σrefer to elasticity effect coefficient, depend on the material of force transfer ball, look into relevant handbook and choose.Equally, first selected its number z, then calculates force transfer ball diameter d according to (2) formula.
Claims (6)
1. a hydraulic pressure ball-type segmentation soft start and overload protection arrangement, comprise jaw crusher frame, the eccentric shaft be installed in frame, be installed on flywheel on eccentric shaft and belt pulley, it is characterized in that: described eccentric shaft is set with belt pulley by the first bearing shell, be set with by the second bearing shell and drivenly hold ball dish, belt pulley is connected with and initiatively holds ball dish; Describedly initiatively hold ball dish and driven holding between ball dish is provided with cut spring, initiatively hold on ball dish and the driven end face holding ball dish and be equipped with 8 square nest ball, be respectively charged into initiatively power transmission steel ball and driven power transmission steel ball in nest ball, and adopted respectively and initiatively hold back ball and driven ball of holding back seals; The described driven circumferential surface holding ball dish has drive sleeve and annular cylinder by splined, is provided with and can withstands the driven annular piston holding a side end face of ball dish in drive sleeve and annular cylinder.
2. hydraulic pressure ball-type segmentation soft start according to claim 1 and overload protection arrangement, is characterized in that: described drive sleeve and annular cylinder are also connected on eccentric shaft by flat key, and are axially fixed at eccentric shaft by card key.
3. hydraulic pressure ball-type segmentation soft start according to claim 1 and overload protection arrangement; it is characterized in that: one end of described eccentric shaft is connected with bearing; the opposite side of bearing installs revolution fuel-intake connection; revolution fuel-intake connection is furnished with seal cover; and revolution fuel-intake connection is connected with drive sleeve and annular cylinder by oil pipe, and drive sleeve and annular cylinder are also furnished with annular cylinder lid.
4. hydraulic pressure ball-type segmentation soft start according to claim 1 and overload protection arrangement; it is characterized in that: described frame is provided with cooling duct, cooling duct can continue through belt pulley with the some air vents initiatively held on the end face of ball dish to active power transmission Steel ball conveyor cooling air.
5. hydraulic pressure ball-type segmentation soft start according to claim 1 and overload protection arrangement, is characterized in that: described side of initiatively holding near cooling duct on ball dish is also provided with oil filler plug.
6. the hydraulic pressure ball-type segmentation soft start of a control as described in claim 1 to 5 any one and the control system of overload protection arrangement, it is characterized in that: comprise hydraulic pump, the side of described hydraulic pump is provided with main overflow valve and bi-bit bi-pass solenoid directional control valve successively, the opposite side of hydraulic pump is connected with check valve, the opposite side of check valve is parallel with two proportional velocity regulating valves, the opposite side of two proportional velocity regulating valves is in series with two position, three-way electromagnetic change valve and accumulator all successively, between described two accumulators, two buffer overflow valves are installed, the opposite side of buffer overflow valve is separately installed with belt pulley annular hydraulic cylinder and flywheel annular hydraulic cylinder, also pressure switch is provided with between belt pulley annular hydraulic cylinder and buffer overflow valve.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3511444A (en) * | 1968-08-01 | 1970-05-12 | Allis Chalmers Mfg Co | Safety device for jaw crusher |
| JPS63118490A (en) * | 1986-11-04 | 1988-05-23 | 株式会社郷鉄工所 | Crusher with safety device having automatic set adjusting mechanism |
| CN2330411Y (en) * | 1998-08-10 | 1999-07-28 | 冶金工业部北京冶金设备研究院 | Overload protection and balance equipment for breaker |
| CN201020372Y (en) * | 2007-03-07 | 2008-02-13 | 上海建设路桥机械设备有限公司 | Hydraulic passing-iron protective system for heavy hydraulic jaw crusher |
| CN202778572U (en) * | 2012-07-25 | 2013-03-13 | 洛阳大华重型机械有限公司 | Hydraulic protection jaw type crusher |
| CN202942949U (en) * | 2012-10-23 | 2013-05-22 | 宣化钢铁集团有限责任公司 | Overload protection device of jaw crusher |
-
2014
- 2014-08-19 CN CN201410410444.2A patent/CN104148156B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3511444A (en) * | 1968-08-01 | 1970-05-12 | Allis Chalmers Mfg Co | Safety device for jaw crusher |
| JPS63118490A (en) * | 1986-11-04 | 1988-05-23 | 株式会社郷鉄工所 | Crusher with safety device having automatic set adjusting mechanism |
| CN2330411Y (en) * | 1998-08-10 | 1999-07-28 | 冶金工业部北京冶金设备研究院 | Overload protection and balance equipment for breaker |
| CN201020372Y (en) * | 2007-03-07 | 2008-02-13 | 上海建设路桥机械设备有限公司 | Hydraulic passing-iron protective system for heavy hydraulic jaw crusher |
| CN202778572U (en) * | 2012-07-25 | 2013-03-13 | 洛阳大华重型机械有限公司 | Hydraulic protection jaw type crusher |
| CN202942949U (en) * | 2012-10-23 | 2013-05-22 | 宣化钢铁集团有限责任公司 | Overload protection device of jaw crusher |
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