CN1014588B - Hydraulic vibration device capable of eliminating automatically piston device - Google Patents
Hydraulic vibration device capable of eliminating automatically piston deviceInfo
- Publication number
- CN1014588B CN1014588B CN 88106063 CN88106063A CN1014588B CN 1014588 B CN1014588 B CN 1014588B CN 88106063 CN88106063 CN 88106063 CN 88106063 A CN88106063 A CN 88106063A CN 1014588 B CN1014588 B CN 1014588B
- Authority
- CN
- China
- Prior art keywords
- piston
- communicated
- hydraulic
- hole
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000033001 locomotion Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The present invention relates to a hydraulic vibration device capable of automatically eliminating the offset of a piston. The mode of forced flow distribution type hydraulic vibration is adopted, so the present invention has the advantages of simple structure, reliable performance, convenient change of vibration frequency, etc. Simultaneously, the present invention adopts the method that pressure signals are used for detecting the position of a vibrating piston at any time, and the pressure signals are fed back into a control valve. The present invention which avoids the phenomenon that the piston offsets in the vibration process and impacts a cylinder cap can be widely used for various hydraulic vibration machines, such as a hydraulic vibration type pile driver, a hydraulic vibration screen, etc.
Description
The invention belongs to hydraulic vibration technology.
In the prior art field, be widely used in the mandatory assignment formula hydraulic vibration device in the various oscillating machinerys, it is convenient that it has the vibration frequency of change, simple in structure, as shown in Figure 1, is made up of the three position four-way directional control valve drive oil cylinder of a zero lap.When the spool of three position four-way directional control valve is reciprocating near zero-bit, the piston of oil cylinder will be thereupon reciprocating and produce vibration, when the reciprocating frequence that changes the three position four-way directional control valve spool, the reciprocating frequence of oil cylinder piston also can change thereupon, and the reciprocating frequence of oil cylinder piston is identical with the reciprocating frequence of the spool of three position four-way directional control valve.But there is a very big problem in this vibrating device, be exactly because oil cylinder piston deadweight three position four-way directional control valve flow asymmetry, reasons such as the error of processing and fit on and external interference, oil cylinder piston can be partial to an end of oil cylinder gradually in vibration processes, the phenomenon of oil cylinder piston bump cylinder cap can take place at last, and vibration can't be gone on.The displacement curve of oil cylinder piston as shown in Figure 2, along with the increase of time t, the displacement s of oil cylinder piston departs from neutrality line (dotting) gradually.Therefore this mandatory assignment formula hydraulic vibration device is to be difficult to actual the use.
In order to overcome the problem of above-mentioned existence, now be developed into a kind of hydraulic vibration device that can eliminate the piston skew automatically, special proposition the present invention.
The method that the present invention adopts is, detect the shifted signal of oil cylinder piston and feed back in the three position four-way directional control valve, owing to be can relative motion between valve pocket and the valve body, the valve port that makes it to form between the spool of three position four-way directional control valve and the valve pocket produces skew, be formed in the one-period of piston up-down, automatically eliminate the skew of piston downwards and to pass through three position four-way directional control valve A mouth respectively when moving upward different with the total flow of B mouth.
Description of drawings:
Fig. 1, mandatory assignment formula hydraulic vibration device schematic diagram.
Fig. 2, mandatory assignment formula hydraulic vibration device piston displacement curve.
When Fig. 3, piston do not have the skew vibration, the input and output pressure curve of hydraulic low-pass filter.
When the skew vibration takes place in Fig. 4, piston, the input and output pressure curve of hydraulic low-pass filter.
Fig. 5, hydraulic low-pass filter schematic diagram.
Fig. 6, can eliminate the hydraulic vibration device structure chart of piston skew automatically.
Fig. 7, the hydraulic vibration device structure chart that can eliminate piston skew automatically of two-position four-way pilot operated directional control valve is housed.
In conjunction with the accompanying drawings structure of the present invention is further described: it comprises the spool (11) of the three position four-way directional control valve that is connected with crank-link mechanism the present invention, valve pocket (12), the valve body (10) that has A, B, P, an O hydraulic fluid port as shown in Figure 6, the oil cylinder epicoele is communicated with the cylinder body (2) that cavity of resorption is communicated with the B mouth with the A mouth, can do relative motion between the piston (3), valve pocket (12) and valve body (10); Valve body (10) also has the hole (13) that is communicated with oil sources (17), the hole (9) that is communicated with hydraulic low-pass filter (8) output; The offset detector of piston (3), it comprises the groove (5) that is had by piston (3) middle part, have the hole (4) that is communicated with oil sources (17) on the cylinder body (2), hole (6) that is communicated with hydraulic low-pass filter (8) input and the hole (7) that is communicated with fuel tank, hydraulic low-pass filter (8) is formed.When normal vibration was done in the skew of piston (3) nothing, the pressure curve of the input pressure of hydraulic low-pass filter (8) (being that hole (6) is located) was shown in Fig. 3 solid line., connect and return pressure P with high pressure P s in the input pressure of hydraulic low-pass filter (8) in period of motion at piston
0(P
0≈ 0) time of connecting equates, i.e. t
1=t
2, the output pressure Pc curve by hydraulic low-pass filter (8) shown in Fig. 3 dotted line, Pc ≈ Ps.When piston (3) owing to reasons such as deadweights, when offseting downward in the vibration, the pressure curve of the input pressure of hydraulic low-pass filter (8) (being that hole (6) is located) is shown in Fig. 4 solid line.Improve the time t that presses Ps
1Greater than meeting low pressure P
0Time t
2, at this moment the output pressure Pc of hydraulic low-pass filter (8) shown in Fig. 4 dotted line, Pc＞Ps.Otherwise when piston (3) takes place upwards to be offset in vibration processes, the output pressure Pc＜Ps of hydraulic low-pass filter (8).That is to say output pressure Pc according to hydraulic low-pass filter (8) be greater than, less than or equal Ps and size can to judge piston (3) be downwards, upwards or do not have the size of skew and side-play amount.Three position four-way directional control valve is with general different, valve pocket (12) and valve body (10) can relative motions, and controlled by the output pressure Pc of hydraulic low-pass filter (8), it is A that valve pocket (12) upper end is subjected to the compression area of hydraulic low-pass filter (8) output pressure Pc control by the hole (9) on the valve body (10)
1, valve pocket (12) lower end is A by the compression area that the hole (13) on the valve body (10) links to each other with oil sources
2, general A
1≈ 2A
2When piston (3) did not have the skew vibration, the upper and lower oil pressure that is subjected to of valve pocket (12) was respectively PcA
1And PsA
2, because Pc=Ps at this moment, so upper and lower stressed equating, valve pocket (12) is in meta, when piston (3) offsets downward in the process of vibration gradually, the output pressure Pc＞Ps of hydraulic low-pass filter (8), at this moment not wait be PcA to the upper and lower oil pressure that is subjected to of valve pocket (12)
1＞PsA
2, valve pocket (12) is moved downward, make it at piston in (3) vibration periods, the total flow by valve port B moves upward piston (3) greater than the total flow by valve port A gradually in vibration processes, eliminate the piston skew.Otherwise when piston (3) upwards skew gradually in the process of vibration, Pc＜Ps at this moment, PcA
1＜PsA
2, valve pocket is moved upward, like this in a vibration period of piston (3), the total flow by valve port A moves downward piston (3) greater than the total flow by valve port B gradually in vibration processes, eliminate the piston skew.
In order to eliminate pressure fluctuation, accumulator (16) is housed in the exit of oil sources (17).
Drive crank (15) rotation with motor or oil motor, drive spool (11) by connecting rod (14) and move up and down, change the rotating speed of motor or oil motor, just can change the vibration frequency of piston (3).
By the object (1) that vibrated can and cylinder body (2) fix, also can be fixing with piston rod and piston (3) as required.
Hydraulic low-pass filter (8) is held by damping hole and liquid and forms, and as shown in Figure 5, the size that liquid hinders and liquid holds that changes damping hole can obtain the transient process of the best correction of piston (3).Wherein the damping hole diameter that can be directly dwindles them with the hole (6) on the cylinder body (2) or hole (7), hole (4) forms damping hole.Liquid holds except that can directly replacing with accumulator the liquid appearance with connecting pipe.
Another embodiment of the present invention is: can use spool (11), the three position four-way directional control valve that valve pocket (12) and valve body (10) are formed is as a pilot stage control two-position four-way pilot operated directional control valve (18), as shown in Figure 7, pass through the vibration of two-position four-way pilot operated directional control valve (18) control piston (3) again, at this moment, the oil cylinder epicoele is communicated with the A ' mouth of two-position four-way pilot operated directional control valve (18), the oil cylinder cavity of resorption is communicated with the B ' mouth of two-position four-way pilot operated directional control valve (18), valve body (10) A, the B mouth respectively with the hydraulic control mouth C of two-position four-way pilot operated directional control valve (18), the D mouth is communicated with.This structure is particularly suitable to the large-power hydraulic vibrator.
Effect of the present invention is: owing to adopt the mode of mandatory assignment formula hydraulic vibration, it has simple in structure, dependable performance, and vibration frequency changes the advantages such as convenient; Adopt at any time again simultaneously and with pressure signal the piston in the vibration is carried out position probing, and feed back to the method for going in the control valve, overcome the phenomenon that piston skew takes place and clashes into cylinder cap in vibration processes; Can be widely used in hydraulic vibration pile driver, the various hydraulic vibration machineries such as hydraulic vibrating screen.
Claims (2)
1, a kind of hydraulic vibration device that can eliminate the piston skew automatically, it comprises by the valve body (10) that has A, B, P, O hydraulic fluid port, valve pocket (12), the three position four-way directional control valve that spool (11) is formed; By the oil cylinder that cylinder body (2), piston (3) are formed, the oil cylinder epicoele is communicated with the A mouth, and the oil cylinder cavity of resorption is communicated with the B mouth; By the crank (15) of motor drive, the power drive part that connecting rod (14) is formed, connecting rod (14) other end is connected with spool (11); The oil sources (17) of accumulator (16) is housed; Feature of the present invention is:
A. also have the hole (13) that is communicated with oil sources (17) on the valve body of three position four-way directional control valve (10), the hole (9) that is communicated with hydraulic low-pass filter (8) output;
B. the middle part has the offset detector of the piston (3) of the piston (3), cylinder body (2) of groove (5) and hydraulic low-pass filter (8) composition, and the hole (4) on the cylinder body (2) is communicated with oil sources, hole (6) are communicated with hydraulic low-pass filter (8) input, hole (7) are communicated with fuel tank;
C. can do relative motion between valve pocket (12) and the valve body (10).
2, a kind of hydraulic vibration device that can eliminate the piston skew automatically, it comprises by the valve body (10) that has A, B, P, O hydraulic fluid port, valve pocket (12), the three position four-way directional control valve that spool (11) is formed; By the oil cylinder that cylinder body (2), piston (3) are formed, the oil cylinder epicoele is communicated with the A ' mouth of two-position four-way pilot operated directional control valve (18), and the oil cylinder cavity of resorption is communicated with the B ' mouth of two-position four-way pilot operated directional control valve (18); By the crank (15) of motor drive, the power drive part that connecting rod (14) is formed, the connecting rod other end is connected with spool (11); The oil sources (17) of accumulator (16) is housed; Feature of the present invention is:
A. also have the hole (13) that is communicated with oil sources (17) on the valve body of three position four-way directional control valve (10), the hole (9) that is communicated with hydraulic low-pass filter (8) output;
B. the middle part has the offset detector of the piston (3) of the piston (3), cylinder body (2) of groove (5) and hydraulic low-pass filter (8) composition, and the hole (4) on the cylinder body (2) is communicated with oil sources, hole (6) are communicated with hydraulic low-pass filter (8) input, hole (7) are communicated with fuel tank;
C. valve body (10) A, B mouth are communicated with hydraulic control mouth C, the D of two-position four-way pilot operated directional control valve (18) respectively;
D. can do relative motion between valve pocket (12) and the valve body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106063 CN1014588B (en) | 1988-08-10 | 1988-08-10 | Hydraulic vibration device capable of eliminating automatically piston device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106063 CN1014588B (en) | 1988-08-10 | 1988-08-10 | Hydraulic vibration device capable of eliminating automatically piston device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1040159A CN1040159A (en) | 1990-03-07 |
| CN1014588B true CN1014588B (en) | 1991-11-06 |
Family
ID=4834080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106063 Expired CN1014588B (en) | 1988-08-10 | 1988-08-10 | Hydraulic vibration device capable of eliminating automatically piston device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014588B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352563C (en) * | 2005-04-27 | 2007-12-05 | 西北工业大学 | Compound vibration unit and method |
| CN107799831B (en) * | 2017-11-06 | 2020-08-11 | 无锡先导智能装备股份有限公司 | Method and device for determining cell datum line |
-
1988
- 1988-08-10 CN CN 88106063 patent/CN1014588B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1040159A (en) | 1990-03-07 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |