CN204212206U - A kind of digger engine revolution speed control system - Google Patents
A kind of digger engine revolution speed control system Download PDFInfo
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- CN204212206U CN204212206U CN201420615586.8U CN201420615586U CN204212206U CN 204212206 U CN204212206 U CN 204212206U CN 201420615586 U CN201420615586 U CN 201420615586U CN 204212206 U CN204212206 U CN 204212206U
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Abstract
The utility model discloses a kind of digger engine revolution speed control system, this system comprises the servo piston that control valve group is communicated with oil pump oil-out with servo valve group and small end, be provided with monitoring engine speed in described system and when engine speed reduces by the conducting of guide's oil circuit to the electromagnetic valve of control valve group, control valve group has the first push rod rotated for axis of rotation with the first pin through the 3rd pin hinge, first push rod is connected with to be arranged on the second push rod that the 5th pin on servo piston is axis of rotation through the second pin, second push rod drives the action of servo valve group to open the oil circuit of oil pump oil-out towards the large end of servo piston through the 4th pin, servo piston is provided with promotion oil pump reduction discharge capacity reduction power stage makes engine speed recover normal variable shifting block.The utility model can prevent the overload of motor while meeting operation of oil pump, meets the requirement of society to energy-saving and emission-reduction, and extends the application life of oil pump.
Description
Technical field
The utility model relates to engineering machinery field, particularly relates to the control technology of digger engine, specifically a kind of digger engine revolution speed control system.
Background technology
Excavator, also known as excavation machinery, is excavate higher or lower than the material holding machine side with scraper bowl, and loads haulage vehicle or unload a kind of earth moving plant to rickyard.Much more very excavator, except being widely used in except in engineering construction, is also applied in; Such as: dig ground, cable laying, laying gas pipeline, petroleum pipeline, piling, fragmentation etc.
In the course of work of excavator; because load is often undergone mutation; cause the fluctuation of speed large; coordination is deteriorated; therefore in order to effectively prevent the engine overload of excavator; usually need to protect motor to control the engine speed of excavator, thus prevent from causing engine stop to cause damage to oil pump because load is excessive, extend oil pump application life.
Summary of the invention
Technical problem to be solved in the utility model is for above-mentioned prior art present situation, and be provided in meet operation of oil pump while can prevent the overload of motor and energy-conserving and environment-protective, and extend a kind of digger engine revolution speed control system in oil pump application life.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of digger engine revolution speed control system, this system comprises the servo piston that control valve group is communicated with oil pump oil-out with servo valve group and small end, be provided with monitoring engine speed in described system and when engine speed reduces by the conducting of guide's oil circuit to the electromagnetic valve of control valve group, control valve group has the first push rod rotated for axis of rotation with the first pin through the 3rd pin hinge, first push rod is connected with to be arranged on the second push rod that the 5th pin on servo piston is axis of rotation through the second pin, second push rod drives the action of servo valve group to open the oil circuit of oil pump oil-out towards the large end of servo piston through the 4th pin, servo piston is provided with promotion oil pump reduction discharge capacity reduction power stage makes engine speed recover normal variable shifting block.
For optimizing technique scheme, the measure taked also comprises:
Above-mentioned control valve group and servo valve group and servo piston is integrated is assembled in same housing, control valve group and servo valve group and servo piston are fitted in the corresponding assembling valve pocket that housing is shaped with respectively.
Above-mentioned control valve group comprises and to be matched the three sections of control valves and three push rod of apical grafting three sections of spool right sides that form by three sections of spools and three sections of valve pockets, and the right-hand member of the 3rd push rod is equipped with the pressure regulator valve for adjusting control valve group operating pressure; 3rd pin is fixedly mounted on the 3rd push rod, and the left port of guide's oil circuit conducting to three section control valve moves to right to promote three sections of spools.
Pressure regulation valve rod, pressure regulation big spring, pressure regulation little spring and pressure spring seat that above-mentioned pressure regulator valve comprises pressure regulation valve gap and press-fits successively through pressure regulation silk braid; Pressure regulation valve gap and housing Stationary liquid are equipped with, and pressure regulation silk braid matches with pressure regulation valve gap spiral.
Above-mentioned pressure regulation big spring and pressure regulation little spring are nested the equipped pressure spring power constituting pressure regulator valve, the two ends of pressure regulation big spring respectively with pressure regulation silk braid and pressure spring seat phase apical grafting, the two ends of pressure regulation little spring respectively with pressure regulation valve rod and pressure spring seat phase apical grafting, the left side of pressure spring seat and the right-hand member phase apical grafting of the 3rd push rod, pressure regulation silk braid is equipped with the screw mandrel of adjustment pressure spring power.
Above-mentioned servo valve group comprises servo valve pocket equipped mutually and servo spool; Servo valve pocket is all extended at the two ends, left and right of servo spool, and the 4th pin is fixedly mounted on the right-hand member of servo spool, and servo spool is fitted with back-moving spring, and servo valve pocket top is pressed with valve pocket stage clip.
Above-mentioned back-moving spring is sleeved on servo spool left end, and the two ends of this back-moving spring respectively with servo spring base and servo valve pocket phase apical grafting, valve pocket stage clip is through fixing equipped bonnet and servo valve pocket phase apical grafting with housing.
Above-mentioned variable shifting block is fixedly set on servo piston, and the 5th pin is arranged on variable shifting block, and the second push rod has the cotter way with one end open with the 5th bayonet fittings.
Compared with prior art, the utility model adds electromagnetic valve in engine revolution speed control system in the control of oil pump, by electromagnetic valve practical work detection system, when engine load increase rotating speed is slack-off, electromagnetic valve action makes guide's oil circuit open to promote control valve group finally to drive servo valve group to open the oil circuit of oil pump oil-out and the large end of servo piston, by the mobile control oil pump of servo piston, make oil pump reduce discharge capacity to reduce power stage, thus reach the object of stable engine speed.The utility model efficiency prevents engine overload, and protection motor, prevents from causing engine stop to cause damage to oil pump because load is excessive, extends oil pump application life, and has certain energy-saving effect.
Accompanying drawing explanation
Fig. 1 is the operating principle schematic diagram of the utility model embodiment;
Fig. 2 is the assembling structure schematic diagram of the utility model control valve group and servo valve group and servo piston;
Fig. 3 is pressure regulator valve structural representation in Fig. 2.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 to Fig. 3 is structural representation of the present utility model.
Reference numeral is wherein: the first pin A, second pin B, 3rd pin C, 4th pin D, 5th pin E, oil pump 1, control valve group 2, three sections of spools 21, three sections of valve pockets 22, 3rd push rod 23, servo valve group 3, servo spool 31, servo valve pocket 32, back-moving spring 33, valve pocket stage clip 34, servo spring base 35, servo piston 4, variable shifting block 41, electromagnetic valve 5, first push rod 6, second push rod 7, pressure regulator valve 8, pressure regulation valve gap 81, pressure regulation silk braid 82, pressure regulation valve rod 83, pressure regulation big spring 84, pressure regulation little spring 85, pressure spring seat 86, screw mandrel 87.
As shown in Figure 1 to Figure 3, a kind of digger engine revolution speed control system of the present utility model, this system comprises the servo piston 4 that control valve group 2 is communicated with oil pump 1 oil-out with servo valve group 3 and small end, be provided with monitoring engine speed in described system and when engine speed reduces by the conducting of guide's oil circuit to the electromagnetic valve 5 of control valve group 2, control valve group 2 has the first push rod 6 rotated for axis of rotation with the first pin A through the 3rd pin C hinge, first push rod 6 is connected with to be arranged on the second push rod 7 that the 5th pin E on servo piston 4 is axis of rotation through the second pin B, second push rod 7 drives the action of servo valve group 3 to open the oil circuit of oil pump 1 oil-out towards the large end of servo piston 4 through the 4th pin D, servo piston 4 be provided with promote oil pump 1 reduce discharge capacity reduce power stage make engine speed recover normal variable shifting block 41.The utility model is starting to want rotating speed to control to adopt to add electromagnetic valve 5 in the control of oil pump 1, electromagnetic valve 5 pairs of systems are utilized to carry out practical work detection, electromagnetic valve 5 is when motor slows down because load increases, guide's oil circuit that gear pump can provide by electromagnetic valve 5 is opened, the secondary pressure oil P of guide's oil circuit is made to promote the action of control valve group 2, finally open oil pump 1 oil-out through servo valve group 3 and lead to the large oil duct held of servo piston 4, servo piston 4 produces displacement under the effect of pressure oil, thus control oil pump 1, oil pump 1 is made to reduce discharge capacity to reduce power stage, thus reach the object of stable engine speed.
In embodiment, in order to reduce the connection of oil pipe, ensure the sensitivity of system acting, control valve group 2 of the present utility model and servo valve group 3 and servo piston 4 is integrated is assembled in same housing, control valve group 2 and servo valve group 3 and servo piston 4 are fitted in the corresponding assembling valve pocket that housing is shaped with respectively.Certain people also can be equipped with in split.
As shown in Figure 2, control valve group 2 comprises and is equipped with the pressure regulator valve 8 for adjusting control valve group operating pressure by match three sections of control valves forming and apical grafting of three sections of spools 21 and three sections of valve pockets 22 at the right-hand member of the 3rd push rod the 23, three push rod 23 of three sections of spool 21 right sides; 3rd pin C is fixedly mounted on the 3rd push rod 23, and the left port of guide's oil circuit conducting to three section control valve moves to right to promote three sections of spools 21.Three sections of spools 21 have the valve rod section of three joint different-diameters successively as we can see from the figure, and the secondary pressure oil P of guide's oil circuit acts on the small end face of three sections of spools 21.
As shown in Figure 3, the pressure regulator valve 8 of the present utility model pressure regulation valve rod 83, pressure regulation big spring 84, pressure regulation little spring 85 and the pressure spring seat 86 that comprise pressure regulation valve gap 81 and press-fit successively through pressure regulation silk braid 82; Pressure regulation valve gap 81 is equipped with housing Stationary liquid, and pressure regulation silk braid 82 matches with pressure regulation valve gap 81 spiral.
Pressure regulation big spring 84 and pressure regulation little spring 85 are nested the equipped pressure spring power constituting pressure regulator valve, the two ends of pressure regulation big spring 84 respectively with pressure regulation silk braid 82 and pressure spring seat 86 phase apical grafting, the two ends of pressure regulation little spring 85 respectively with pressure regulation valve rod 83 and pressure spring seat 86 phase apical grafting, the left side of pressure spring seat 86 and the right-hand member phase apical grafting of the 3rd push rod 23, pressure regulation silk braid 82 is equipped with the screw mandrel 87 of adjustment pressure spring power.Pressure regulation silk braid 82 energy adjustable diameter and screw adjusting pressure regulation big spring 84 preload pressure, screw mandrel 87 is for regulating the preload pressure of pressure regulation little spring 85.
In embodiment as shown in Figure 2, servo valve group 3 comprises servo valve pocket 32 equipped mutually and servo spool 31; The right-hand member that servo valve pocket the 32, four pin D is fixedly mounted on servo spool 31 is all extended at the two ends, left and right of servo spool 31, and servo spool 31 is fitted with back-moving spring 33, and servo valve pocket 32 top is pressed with valve pocket stage clip 34.
Back-moving spring 33 is sleeved on servo spool 31 left end, and the two ends of this back-moving spring 33 respectively with servo spring base 35 and servo valve pocket 32 phase apical grafting, valve pocket stage clip 34 is through fixing equipped bonnet and servo valve pocket 32 phase apical grafting with housing.
Variable shifting block 41 of the present utility model is fixedly set on servo piston 4, and the 5th pin E is arranged on variable shifting block 41, and the second push rod 7 has the cotter way with one end open coordinated with the 5th pin E.
Fig. 1 is fundamental diagram of the present utility model: as shown in the figure, and in system of the present utility model, engine speed monitored by electromagnetic valve 5.Along with external applied load increases, the power of oil pump 1 increases, and the load of motor also increases thereupon.When external applied load increase to make motor fall speed time, electric-control system works, and what it turned oil pump 1 automatically down plays pressure regulation power, reduces the power of oil pump, it also reduces the load of motor, make engine speed recover normal.
Its control procedure is as follows:
When motor falls speed, electromagnetic valve 5 action, guide's oil circuit and three sections of spool 21 smallest end are connected, promote three sections of spools 21 to move right, 3rd push rod 23 is also moved right, first push rod 6 is rotated counterclockwise around the first pin A by the 3rd pin C on the 3rd push rod 23, second push rod 7 is turned clockwise around the 5th pin E by the second pin B, second push rod 7 turn clockwise by the 4th pin D drive servo spool 31 move right, oil pump 1 oil-out and the large termination of servo piston 4 is caused to be led to, because servo piston 4 is greater than the little end section of servo piston 4 in end interface greatly, servo piston 4 moves right, oil pump 1 discharge capacity is reduced, power reduction, engine speed is made to recover normal.
The utility model has the advantages that: can engine overload be prevented, save the energy.
The beneficial effects of the utility model are: the overload that can prevent motor meeting operation of oil pump while, meet the requirement of society to energy-saving and emission-reduction now, and extend the application life of oil pump.
Claims (8)
1. a digger engine revolution speed control system, this system comprises the servo piston (4) that control valve group (2) is communicated with oil pump (1) oil-out with servo valve group (3) and small end, it is characterized in that: be provided with monitoring engine speed in described system and when engine speed reduces by the conducting of guide's oil circuit to the electromagnetic valve (5) of control valve group (2), described control valve group (2) has the first push rod (6) rotated for axis of rotation with the first pin (A) through the 3rd pin (C) hinge, described the first push rod (6) is connected with to be arranged on the second push rod (7) that the 5th pin (E) on servo piston (4) is axis of rotation through the second pin (B), described second push rod (7) drives servo valve group (3) action to open the oil circuit of oil pump (1) oil-out towards the large end of servo piston (4) through the 4th pin (D), described servo piston (4) is provided with promotion oil pump (1) reduction discharge capacity reduction power stage makes engine speed recover normal variable shifting block (41).
2. a kind of digger engine revolution speed control system according to claim 1, it is characterized in that: described control valve group (2) and servo valve group (3) and servo piston (4) is integrated is assembled in same housing, described control valve group (2) and servo valve group (3) and servo piston (4) are fitted in the corresponding assembling valve pocket that housing is shaped with respectively.
3. a kind of digger engine revolution speed control system according to claim 2, it is characterized in that: described control valve group (2) comprises and to be matched the three sections of control valves and three push rod (23) of apical grafting three sections of spool (21) right sides that form by three sections of spools (21) and three sections of valve pockets (22), and the right-hand member of the 3rd described push rod (23) is equipped with the pressure regulator valve (8) for adjusting control valve group operating pressure; The 3rd described pin (C) is fixedly mounted on the 3rd push rod (23), and the left port of described guide's oil circuit conducting to three section control valve moves to right to promote three sections of spools (21).
4. a kind of digger engine revolution speed control system according to claim 3, is characterized in that: pressure regulation valve rod (83), pressure regulation big spring (84), pressure regulation little spring (85) and pressure spring seat (86) that described pressure regulator valve (8) comprises pressure regulation valve gap (81) and press-fits successively through pressure regulation silk braid (82); Described pressure regulation valve gap (81) and housing Stationary liquid are equipped with, and described pressure regulation silk braid (82) matches with pressure regulation valve gap (81) spiral.
5. a kind of digger engine revolution speed control system according to claim 4, it is characterized in that: described pressure regulation big spring (84) and pressure regulation little spring (85) are nested the equipped pressure spring power constituting pressure regulator valve, the two ends of described pressure regulation big spring (84) respectively with pressure regulation silk braid (82) and pressure spring seat (86) phase apical grafting, the two ends of described pressure regulation little spring (85) respectively with pressure regulation valve rod (83) and pressure spring seat (86) phase apical grafting, the left side of described pressure spring seat (86) and the right-hand member phase apical grafting of the 3rd push rod (23), described pressure regulation silk braid (82) is equipped with the screw mandrel (87) of adjustment pressure spring power.
6. a kind of digger engine revolution speed control system according to claim 5, is characterized in that: described servo valve group (3) comprises servo valve pocket (32) equipped mutually and servo spool (31); Servo valve pocket (32) is all extended at the two ends, left and right of described servo spool (31), the 4th described pin (D) is fixedly mounted on the right-hand member of servo spool (31), described servo spool (31) is fitted with back-moving spring (33), and described servo valve pocket (32) top is pressed with valve pocket stage clip (34).
7. a kind of digger engine revolution speed control system according to claim 6, it is characterized in that: described back-moving spring (33) is sleeved on servo spool (31) left end, and the two ends of this back-moving spring (33) respectively with servo spring base (35) and servo valve pocket (32) phase apical grafting, described valve pocket stage clip (34) is through fixing equipped bonnet and servo valve pocket (32) phase apical grafting with housing.
8. a kind of digger engine revolution speed control system according to claim 7, it is characterized in that: described variable shifting block (41) is fixedly set on servo piston (4), the 5th described pin (E) is arranged on variable shifting block (41), and described the second push rod (7) has the cotter way with one end open coordinated with the 5th pin (E).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420615586.8U CN204212206U (en) | 2014-10-23 | 2014-10-23 | A kind of digger engine revolution speed control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420615586.8U CN204212206U (en) | 2014-10-23 | 2014-10-23 | A kind of digger engine revolution speed control system |
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| CN204212206U true CN204212206U (en) | 2015-03-18 |
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| CN201420615586.8U Active CN204212206U (en) | 2014-10-23 | 2014-10-23 | A kind of digger engine revolution speed control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180130A (en) * | 2018-03-09 | 2018-06-19 | 徐工集团工程机械有限公司 | Variable servo valve, hydraulic system and variable pump |
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2014
- 2014-10-23 CN CN201420615586.8U patent/CN204212206U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180130A (en) * | 2018-03-09 | 2018-06-19 | 徐工集团工程机械有限公司 | Variable servo valve, hydraulic system and variable pump |
| CN108180130B (en) * | 2018-03-09 | 2024-02-06 | 江苏徐工工程机械研究院有限公司 | Variable servo valve, hydraulic system and variable pump |
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