CN104148156A - Hydraulic ball type sectional soft start and overload protection device and control system thereof - Google Patents
Hydraulic ball type sectional soft start and overload protection device and control system thereof Download PDFInfo
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- CN104148156A CN104148156A CN201410410444.2A CN201410410444A CN104148156A CN 104148156 A CN104148156 A CN 104148156A CN 201410410444 A CN201410410444 A CN 201410410444A CN 104148156 A CN104148156 A CN 104148156A
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Abstract
The invention discloses a hydraulic ball type sectional soft start and overload protection device. The hydraulic ball type sectional soft start and overload protection device comprises a jaw crusher frame, an eccentric shaft mounted on the frame, a flywheel and a belt wheel, wherein the belt wheel is idly mounted on the eccentric shaft through a first bearing bush; a driven ball bearing disc is idly mounted on the eccentric shaft through a second bearing bush; the belt wheel is connected with a driving ball bearing disc; a separation spring is arranged between the driving ball bearing disc and the driven ball bearing disc; eight square ball holes are respectively formed in the end surfaces of the driving ball bearing disc and the driven ball bearing disc; driving force conveying steel balls and driven force conveying steel balls are respectively loaded into the ball holes; the ball holes are respectively sealed with driving ball collecting rings and driven ball collecting rings; the peripheral surface of the driven ball bearing disc is connected with a transmission sleeve and an annular oil cylinder through splines; and annular pistons capable of butting against one side end surface of the driven ball bearing disc are mounted in the transmission sleeve and the annular oil cylinder. The hydraulic ball type sectional soft start and overload protection device has the advantages of reliable operation, sensitive response to overload, quick clutch, convenience for discharging complete objects and low cost.
Description
Technical field
The present invention relates to a kind of Machine guarding, be specifically related to a kind of hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof that is applied to jaw crusher.
Background technology
Jaw crusher is a kind of engineering machinery being 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 is made periodic wobble around hanging axle to fixed jaw.When moving jaw is during near fixed jaw, the ore being positioned between two jaws is broken.When moving jaw leaves fixed jaw, broken ore, under Action of Gravity Field, is discharged through gape.At present, jaw crusher is most widely used only has two kinds of patterns: moving jaw is made the crank and rocker mechanism jaw crusher 1 (b) that simple crank double rocker mechanism jaw crusher Fig. 1 (a) swinging and moving jaw are done complicated swing.
Jaw crusher belongs to large inertia devices, and 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 fall into non-broken thing in the crusher chamber, while equipment being blocked suddenly as the drill bit of the bucket tooth of excavator, rig and the non-broken thing of other metal, cause the peakload of moment to equipment itself and electrical system generation enormous impact thereof.So in jaw crusher, to design be quick on the draw, overload protection and the soft starter device of reliable operation.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 of improving large inertia devices 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 is conventionally to offer hole or groove on the safe bracket of being made by plain cast iron.When disintegrating machine surpasses normal duty, safe bracket fractures immediately, and machine is quit work, thereby avoids machine main parts size to damage.The shortcoming of this overload protection arrangement maximum is insensitive to overload reaction.In addition, replacing bracket spended time is also longer.Hydraulic pressure overload protective comprises two kinds of hydraulic connecting rod formula and hydraulic friction clutches formulas.Although the first device can make disintegrating machine realize overload protection, only can realize two sections of startings.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, a kind of hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof that is applied to jaw crusher is provided.
Technical scheme: a kind of hydraulic pressure ball-type segmentation soft start of the present invention and overload protection arrangement, comprise jaw crusher frame, be installed on eccentric shaft in frame, be installed on flywheel and belt pulley on eccentric shaft, on described eccentric shaft, by the first bearing shell, be set with belt pulley, by the second bearing shell, be set with the driven ball dish that holds, on belt pulley, be connected with and initiatively hold 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 that holds ball dish and be equipped with 8 square nest ball holes, in nest ball hole, be respectively charged into initiatively power transmission steel ball and driven power transmission steel ball, and adopted respectively and initiatively hold back ball and the driven ball of holding back seals; The described driven circumferential surface that holds ball dish has drive sleeve and annular cylinder by splined, is provided with and can withstands the driven annular piston that holds 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 driven hold ball dish before jaw crusher starts in released state; When jaw crusher is worked, under the thrust of annular piston, initiatively hold ball dish and the driven ball dish and corresponding initiatively power transmission steel ball and driven power transmission steel ball thereof of holding is combined as a whole in opposite directions staggered pressing, and then drive 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 is installed revolution fuel-intake connection, on 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, on drive sleeve and annular cylinder, is also furnished with annular cylinder lid.
Above-mentioned revolution fuel-intake connection can be guaranteed eccentric shaft revolution, when jaw crusher work, by hydraulic system, to encircling heart oil cylinder fuel feeding, provides power for whole protective device that is:.
Further, described frame is provided with cooling duct, when jaw crusher is worked, cooling duct can be continuously enforceable by belt pulley and the some air vents that initiatively hold on the end face of ball dish to active power transmission steel ball, carry sufficient cooling air.
For convenience of oiling, a described side of initiatively holding close cooling duct on ball dish is also provided with oil filler plug.
The other end at jaw crushing eccentric drive shaft; be symmetrically installed with identical soft start and overload protection arrangement; flywheel also can be combined according to predetermined segmentation starting sequence, to complete the integral body starting of jaw crusher and reduce impact load when transshipping with eccentric shaft.
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, one 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 all in series with two position, three-way electromagnetic change valve and accumulator 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, between belt pulley annular hydraulic cylinder and buffer overflow valve, be also provided with pressure switch.
Wherein, main overflow valve can throttling, speed governing, loop voltage stabilizing and is made hydraulic pump off-load; With accumulator, can absorb the compression shock in control system; And buffer overflow valve plays the effect of overload overflow; Proportion of utilization flow speed control valve can make jaw crusher accelerate by predetermined rule starting, 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, clutch is rapid, and is convenient to discharge non-broken thing;
(2) hydraulic control system in the present invention is conducive to absorb the shock and vibration in disintegrating machine work, and starting process can optimal control;
(3) the present invention is provided with cooling duct, can successional conveying force cooling air, is conducive to reduce transmission fault, increases the service life;
(4) the present invention is simple in structure, and installation and maintenance is convenient, and cost is low.
Accompanying drawing explanation
Fig. 1 (a) is that in prior art, moving jaw is made the simple crank double rocker mechanism jaw crusher schematic diagram swinging;
Fig. 1 (b) is that in prior art, moving jaw is made the complicated crank and rocker mechanism jaw crusher schematic diagram swinging;
Fig. 2 is structural representation of the present invention;
Fig. 3 be in Fig. 2 A-A to cutaway view;
Fig. 4 is control system figure in the present invention;
Fig. 5 is the transmission schematic diagram between power transmission steel ball and driven power transmission steel ball initiatively in the present invention.
The specific embodiment
Below technical solution of the present invention is elaborated 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, be installed on the eccentric shaft 21 in frame 20, the flywheel 22 that is installed on eccentric shaft 21 and belt pulley 16, on eccentric shaft 21, by the first bearing shell 19, be set with belt pulley 16, by the second bearing shell 24, be set with and hold the driven ball dish 9 that holds of ball dish, on belt pulley 16, be connected with and initiatively hold ball dish 14; Initiatively hold ball dish 14 and driven holding is provided with cut spring 15 between ball dish 9, initiatively hold on ball dish 14 and the driven end face that holds ball dish 9 and be equipped with 8 square nest ball holes, in nest ball hole, be respectively charged into initiatively power transmission steel ball 13 and driven power transmission steel ball 10, and adopted respectively and initiatively hold back ball 12 and seal with the driven ball 11 of holding back; The driven circumferential surface that holds ball dish 9 has drive sleeve and annular cylinder 8 by splined, is provided with and can withstands the driven annular piston 7 that holds 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 hole, also will guarantee to be slightly less than 1/2nd spheroid and protrude corresponding drive plate end face.
Above-mentioned cut spring 15 can guarantee initiatively to hold ball dish 14 and driven hold ball dish 9 before jaw crusher starts in released state; When jaw crusher is worked, under the thrust of annular piston 7, initiatively hold ball dish 14 and the driven ball dish 9 and corresponding initiatively power transmission steel ball 13 and driven power transmission steel ball 10 thereof of holding is combined as a whole in opposite directions staggered pressing, and then drive 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 is installed revolution fuel-intake connection 1, revolution is furnished with seal cover 2 on fuel-intake connection 1, and revolution fuel-intake connection 1 is connected with drive sleeve and annular cylinder 8 by oil pipe 4, is also furnished with annular cylinder and covers 6 on drive sleeve and annular cylinder 8.Wherein, revolution fuel-intake connection 1 can be guaranteed eccentric shaft 21 revolution, that is: when jaw crusher work, by hydraulic system to drive sleeve and encircle heart oil cylinder 8 fuel feeding and provide power for whole protective device.
Frame 20 in the present embodiment is provided with cooling duct 18, and when jaw crusher is worked, cooling duct 18 is can be continuously enforceable by belt pulley 16 with initiatively hold some air vents on the end face of ball dish 14 to the sufficient cooling air of active power transmission steel ball 13 conveying.
For convenience of oiling, initiatively hold the side near cooling duct 18 on ball dish 14 and be also provided with oil filler plug 17.
The other end at jaw crushing eccentric drive shaft 21; be symmetrically installed with identical soft start and overload protection arrangement; flywheel 22 also can be combined according to predetermined segmentation starting sequence, to complete the integral body starting of jaw crusher and reduce impact load when transshipping with eccentric shaft 21.
As shown in Figure 3, 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, one 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 all in series with two position, three-way electromagnetic change valve 30 and accumulator 35 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, between belt pulley annular hydraulic cylinder 32 and buffer overflow valve 34, be also provided with pressure switch 36.
Wherein, main overflow valve 27 can throttling, speed governing, loop voltage stabilizing and is made hydraulic pump 25 off-loads; With accumulator 35, can absorb the compression shock in control system; And buffer overflow valve 34 plays the effect of overload overflow; Proportion of utilization flow speed control valve 29 can make jaw crusher accelerate by predetermined rule starting, 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 loads, now belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33 all in pressure release state.In Fig. 2, cut spring 15 is by active tray 14 with driven to hold ball dish 9 separated, and the relative eccentric shaft 21 of starting jaw crusher main motor drive pulley 16 dallies, and has now completed first paragraph starting.
Make subsequently electromagnet 1DT and 2DT obtain electric, two position, three-way electromagnetic change valve 30 is in left position, accumulator 35 topping ups, pressure oil also enters belt pulley annular hydraulic cylinder 32 rodless cavities simultaneously, and promote the driven spring force and initiatively tray 14 combinations that ball dish 9 overcomes cut spring 15 that hold, the active power transmission steel ball 13 and the rear unitary rotation of the staggered compression of driven power transmission steel ball 10 that make the two end face, eccentric shaft 21 starts to rotate immediately, has so far completed second segment starting.
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 senders obtain electromagnet 3DT, when pressure oil enters after flywheel annular hydraulic cylinder 33, flywheel 22 also rotates with eccentric shaft 21 and belt pulley 16, now the 3rd section of starting completes, thereby whole Soft Start-up Process finishes.
Regulate the size of the area of passage of proportional velocity regulating valve 29, thereby change the flow that enters belt pulley annular hydraulic cylinder 32 and flywheel annular hydraulic cylinder 33, so can control the combination speed of belt pulley 16 and eccentric shaft 21 and flywheel 22 and eccentric shaft 21.Adoption rate formula is controlled, can be by predetermined speed Changing Pattern, as after first slow soon or at the uniform velocity etc., make belt pulley 16 and eccentric shaft 21 and flywheel 22 and eccentric shaft 21 combination under minimal impact load, realize optimum soft start.
(2) implementation procedure of overload protection
In jaw crusher work, with the object that is broken is long-pending, make hydraulic system pressure fluctuation larger with firmness change, 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, while crossing iron, pressure reaches buffer overflow valve 34 settings, and buffer overflow valve 34 is opened overflow, has limited 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; must cause motor overheating; make pressure switch 36 senders in control system, electromagnet 1DT and 2DT dead electricity, belt pulley annular hydraulic cylinder 32 and the flywheel annular hydraulic cylinder 33 rodless cavities fuel tank that is linked back; initiatively tray 14 is with driven to hold ball dish 9 separated; belt pulley 16 and flywheel 22 idle running, disintegrating machine quits work, and then realizes overload protection.In the time of overload protection, also cut off power chain, be conducive to like this discharge non-broken thing.
For the soft start in assurance the present invention and the reliability service of 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 that holds ball dish 9, the effective work area of annular cylinder etc.Wherein, initiatively number and the diameter of power transmission steel ball 13 and driven power transmission steel ball 10 are 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 intensity of splined, calculate, by shear fails form, determine each power transmission steel ball size and number:
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 conventionally no less than 8; Dm is that power transmission steel ball contact point c is to the distance of eccentric shaft 21 center lines; 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, the information that Sc comprises relevant each power transmission steel ball size, so first select its number z, then calculates force transfer ball diameter d according to (1) formula.
While determining its number and diameter when losing efficacy by each power transmission worn steel ball, with reference to relevant contact strength between gear and tooth face, calculate:
In formula, Fn refers to the normal force of power transmission steel ball,
As shown in Figure 4,
and
in formula, ψ is identical with (1) formula meaning with Dm; 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, be installed on eccentric shaft in frame, be installed on flywheel and belt pulley on eccentric shaft, it is characterized in that: on described eccentric shaft, by the first bearing shell, be set with belt pulley, by the second bearing shell, be set with the driven ball dish that holds, on belt pulley, be connected with and initiatively hold 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 that holds ball dish and be equipped with 8 square nest ball holes, in nest ball hole, be respectively charged into initiatively power transmission steel ball and driven power transmission steel ball, and adopted respectively and initiatively hold back ball and the driven ball of holding back seals; The described driven circumferential surface that holds ball dish has drive sleeve and annular cylinder by splined, is provided with and can withstands the driven annular piston that holds 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 is installed revolution fuel-intake connection; on 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, on drive sleeve and annular cylinder, is 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 the cooling airduct that goes, cooling duct can be continuously by belt pulley with initiatively hold some air vents on the end face of ball dish to active power transmission steel ball conveying cooling air.
5. hydraulic pressure ball-type segmentation soft start according to claim 1 and overload protection arrangement, is characterized in that: a described side of initiatively holding close cooling duct on ball dish is also provided with oil filler plug.
6. hydraulic pressure ball-type segmentation soft start as described in claim 1 to 5 any one of a control and the control system of overload protection arrangement, it is characterized in that: comprise hydraulic pump, one 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 all in series with two position, three-way electromagnetic change valve and accumulator 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, between belt pulley annular hydraulic cylinder and buffer overflow valve, be also provided with pressure switch.
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| CN201410410444.2A CN104148156B (en) | 2014-08-19 | 2014-08-19 | Hydraulic pressure ball-type segmentation soft start and overload protection arrangement and control system thereof |
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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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