CN109236777A - A kind of overflow valve in engineering machinery - Google Patents
A kind of overflow valve in engineering machinery Download PDFInfo
- Publication number
- CN109236777A CN109236777A CN201811256601.3A CN201811256601A CN109236777A CN 109236777 A CN109236777 A CN 109236777A CN 201811256601 A CN201811256601 A CN 201811256601A CN 109236777 A CN109236777 A CN 109236777A
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- China
- Prior art keywords
- valve
- valve body
- hole
- spool
- reset spring
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The present invention provides a kind of overflow valves in engineering machinery, including valve body, valve seat, valve body two, locating piece, valve hole part and damper piston, damper piston and the locating piece for being mounted on valve body left port are formed with cushion chamber, increase of the present invention is provided with damper piston, damper piston is sleeved on valve body two, by damper piston move to right and the throttling action of damping hole, spool is opened using the pressure difference of oil pressure, in damper piston after moving to right, using the balance of spool both ends oil pressure and the collective effect of reset spring spring spool is in close state, the size of damping hole of the invention can determine the size of fluid flow, and then it can determine the time of buffering, pass through the design structure of buffer-type, it is steady to play starting, brake the effect of absorption pressure pulse, protection system safety, the operating characteristics of improvement system.
Description
Technical field
The present invention relates to machine control techniques field more particularly to a kind of overflow valves in engineering machinery.
Background technique
In Construction Machinery System, have many swing mechanisms during exercise, since rotary inertia of getting on the bus is big, starting,
It can cause very big hydraulic shock when braking or suddenly commutation.It is hydraulic when especially encountering obstacle in turning course and stopping suddenly
Impact more obvious, hydraulic shock will lead to entire hydraulic system and element and generate vibration and noise, or even destroy.The prior art
In, people generally use rotary motor overflow valve to limit the maximum working pressure of rotary system, but common overflow valve is again
It is difficult to completely eliminate or absorption system starting or hydraulic shock when braking, thus can not further improve the operability of system
Can, it cannot preferably protect the service life of Hydraulic Elements.
Summary of the invention
To overcome following problems existing in the prior art, many swing mechanisms are being moved in Construction Machinery System
When, very big hydraulic shock can be caused in starting, braking or commutation suddenly, common overflow valve is difficult to completely eliminate or inhale again
The hydraulic shock when starting of receipts system or braking, thus can not further improve the operating characteristics of system, it cannot preferably protect
The service life of Hydraulic Elements.The present invention provides a kind of overflow valves in engineering machinery, which is characterized in that including valve
Body, valve seat, valve body two, locating piece, valve hole part and damper piston, the valve body two are located at valve inner, valve seat and locating piece
Positioned at the both ends of valve body two, the valve hole part is located inside valve body two, and the valve body includes mobile cavity, the damper piston
It is slided in mobile cavity, the damper piston is located on two outer circumference surface of valve body, damper piston and is mounted on valve body left port
Locating piece is formed with cushion chamber.
On this basis, the valve hole part includes spool, reset spring spring and adjusting bolt；The spool and reset
Spring spring is mounted in valve body two, adjusts the rear port that valve body two is arranged in bolt, the both ends point of the reset spring spring
It is not pressed mutually with spool and adjusting bolt, adjusts the pre-tightening tension of bolt energy adjustable diameter and screw adjusting reset spring spring, the spool portion
The axial hole of part is the axis hole being formed with along spool axle center；Damping hole one that the cushion chamber is formed with through valve body two and valve hole part
Axial hole is connected with the oil inlet of valve body.
On this basis, the valve body two is formed with successively through-flow chamber, pilot hole and reset spring chamber, the spool system
There are valve head and valve rod, valve head is located in the flow cavity of front, and the valve rod liquid sealing is matched with pilot hole sliding, and valve rod
One end extend into mutually to push up in reset spring chamber with the reset spring spring being fitted in reset spring chamber and match, the damping hole one
Positioned at the back segment of two reset spring chamber of valve body, the flow cavity is formed with the oil outlet of connection valve body oil return opening.
On this basis, the spool axis hole is formed with damping hole two, and the import of spool axis hole is in gradually small funneling
Bellmouth.
On this basis, convex surface is formed on the valve rod, convex surface cutting ferrule apical grafting has pressure pad, the reset spring spring
Front end, which is mutually pushed up through pressure pad with spool, matches.
On this basis, the fixed front end for being fitted in valve body two of the valve seat, valve seat are formed with connection valve body oil inlet and valve
The connecting hole of core axle hole, connecting hole, which expands to be formed with, seals the circular arc camber hole matched with the sealing bulb of valve head.
On this basis, the locating piece fixing seal is mounted on the left port of valve body, and locating piece is formed with containing interior spiral shell
The pilot hole of line, the external screw thread for adjusting bolt is matched with the connection of the internal screw thread spiral of pilot hole, after the valve body two
The reaming face phase apical grafting of end face and pilot hole.
On this basis, the damper piston periphery wall is slidingly sealed with valve body mobile cavity internal perisporium and matches, and valve body moves
Dynamic chamber right end wall is provided with the oil circuit of connection valve body oil return opening.
Compared with prior art, the beneficial effects of the present invention are:
Increase of the present invention is provided with damper piston, and valve body two and spool are formed with damping hole, and damper piston is sleeved on valve body
On two, by damper piston move to right and the throttling action of damping hole, open spool using the pressure difference of oil pressure, in damper piston
Move to right after, using the balance of spool both ends oil pressure and the collective effect of reset spring spring make spool be in close shape
State.The size of damping hole of the invention can determine the size of fluid flow, and then can determine the time of buffering, pass through buffer-type
Design structure plays the role of starting steadily, brakes absorption pressure pulse.Protection system safety, improves system operatio performance.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is structural representation of the present invention with valve body before equipped；
Fig. 3 is the assembly structure figure of valve hole part in Fig. 1；
Fig. 4 is the structural schematic diagram of valve body two in Fig. 1；
In figure: P, oil inlet, T, oil return opening, 1, valve body, 11, mobile cavity, 12, oil circuit, 2, valve seat, 21, connecting hole, 3, valve body
Two, 3a, flow cavity, 3b, pilot hole, 3c, reset spring chamber, 31, damping hole one, 32, oil outlet, 4, valve hole part, 41, valve
Core, 41a, axis hole, 41b, damping hole two, 41c, bellmouth, 411, valve head, 412, valve rod, 412a, convex surface, 413, sealing bulb,
42, reset spring spring, 43, adjusting bolt, 5, damper piston, 5a, cushion chamber, 6, pressure pad, 7, locating piece, 7a, reaming face
Specific embodiment
Below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific examples are only used to explain the present invention, is not intended to limit the present invention.
As Figure 1-Figure 4, the present invention schematically illustrates a kind of overflow valve in engineering machinery.
A kind of overflow valve in engineering machinery of present disclosure, as shown in Figure 1, including valve body 1, valve seat 2, valve body two
3, locating piece 7, valve hole part 4 and damper piston 5, valve body 23 are located inside valve body 1, and valve seat 2 and locating piece 7 are located at valve body 23
Both ends, valve hole part 4 is located inside valve body 23, and valve body 1 includes mobile cavity 11, and damper piston 5 is sliding in mobile cavity 11
Dynamic, damper piston 5 is located on 23 outer circumference surface of valve body, and damper piston 5 is formed with the locating piece 7 for being mounted on 1 left port of valve body
The axial hole of damping hole 1 and valve hole part 4 that cushion chamber 5a, cushion chamber 5a are formed with through valve body 23 and the oil inlet P of valve body 1
It is connected, damper piston 5 is delayed by moving to right the pressure difference of generation, realizes the pooling feature of overflow valve.Compared with prior art originally
Invention is set with damper piston 5 on valve body 23, makees by moving to right for damper piston 5 with the throttling of two damping hole 1 of valve body
With realizing the buffering of overflow valve, reach and absorb brake pressure pulse, eliminate hydraulic fluctuation, improve the purpose of system operatio performance；
As shown in Figure 2 and Figure 3, valve hole part 4 of the invention includes spool 41, reset spring spring 42 and adjusting bolt 43；41 He of spool
Reset spring spring 42 is mounted in valve body 23, adjusts the rear port that valve body 23 is arranged in bolt 43, reset spring spring 42
Both ends respectively with spool 41 and adjust the press of 43 phase of bolt, adjust bolt 43 can adjustable diameter and screw adjusting reset spring spring 42 preload
Tension, the axial hole of valve hole part are the axis hole 41a being formed with along 41 axle center of spool.It adjusts bolt 43 and presses against reset spring spring
42 rear end, reset spring spring 42 determine the cracking pressure of spool 41, and in actual operation, people can be according to system condition
Requirement, by adjust bolt 43 change reset spring spring 42 pressure set points, thus determine spool close pressure model
It encloses；As shown in Figure 2, Figure 3, Figure 4, valve body 23 of the invention is formed with successively through-flow chamber 3a, pilot hole 3b and reset spring chamber
3c, spool 41 are formed with valve head 411 and valve rod 412, and valve head 411 is located in the flow cavity 3a of front, the sealing of 412 liquid of valve rod and guiding
3b sliding in hole matches, and one end of valve rod 412 extend into reset spring chamber 3c and is fitted in reset spring chamber 3c
42 phase top of reset spring spring is matched, and damping hole 1 is located at the back segment of 23 reset spring chamber 3c of valve body, and flow cavity 3a is formed with connection
The oil outlet 32 of valve body oil return inlet T.412 liquid of valve rod sealing of the invention is matched with pilot hole 3b, by flow cavity 3a and reset
Spring cavity 3c is isolated into mutually independent cavity；Spool axis hole 41a of the invention is formed with two 41b of damping hole, and spool axis hole
The import of 41a is in gradually small funneling bellmouth 41c.As shown in figure 3, convex surface 412a is formed on valve rod 412, convex surface 412a cutting ferrule
Apical grafting has pressure pad 6, and the front end of reset spring spring 42 is matched through pressure pad 6 and 41 phase top of spool；As shown in Figure 1, valve seat 2 is outer
The right end mounting hole sealing of circumferential surface and valve body 1 is mutually equipped with, the first fixed front end for being fitted in valve body 23 of valve seat 2, then with valve body two
3 are pressed into valve body 1 together, and valve seat 2 and valve body 23 are fastenedly connected integrally, and valve seat 2 is formed with connection valve body oil inlet P and spool
The connecting hole 21 of axis hole 41a, connecting hole 21, which expands to be formed with, seals the circular arc camber hole matched with the sealing bulb 413 of valve head 411.
Valve seat 2 matches the oil circuit connection on-off of control oil inlet P and oil return inlet T with spool 41；7 fixing seal of locating piece is mounted on valve
The left port of body 1, and locating piece 7 is formed with the pilot hole containing internal screw thread, adjusts the external screw thread of bolt 43 and the interior spiral shell of pilot hole
The connection of line spiral matches, the reaming face 7a phase apical grafting of the rear end face and pilot hole of valve body 23；5 periphery wall of damper piston and valve
11 internal perisporium of body mobile cavity, which is slidingly sealed, to be matched, and 11 right end wall of valve body mobile cavity is provided with the oil circuit 12 of connection valve body oil return inlet T.
The working principle of the invention is:
The sealing bulb 413 of spool 41 is close to the circular arc song of valve seat 2 under the action of reset spring spring 42 in the initial state
Face, closes channel of the hydraulic oil from oil inlet P to oil return inlet T, and damper piston 5 is moved due to being in valve body under the movement of last time
The left end of dynamic chamber 11.As slewing directional control valve returns to middle position in system, oil inlet P, the oil return inlet T of hydraulic motor are controlled by revolution
Valve processed is closed.At this time due to the effect of inertia of mechanism, hydraulic motor will continue to rotate, and hydraulic motor power and energy is pump.Overflow
The hydraulic pressure of valve oil inlet P is begun to ramp up, bellmouth 41c, damping hole two 41b, spool axis hole of the pressure oil through spool 41
41a, reset spring chamber 3c and damping hole 1 enter the left end cushion chamber 5a of damper piston 5, due to the pressure of oil inlet P at this time
Pressure greater than oil return inlet T makes damper piston 5 move right, due to two 41b's of damping hole in 5 moving process of damper piston
Damping action, which makes the liquid of flowing generate pressure difference, causes the pressure of oil inlet P to be greater than reset spring chamber 3c and reset spring spring
42 pressure, spool 41 overcome the pressure of reset spring spring 42 to be moved to the left, sealing bulb 413 lift off a seat 2 circular arc it is bent
Face makes pressure oil flow to oil return inlet T from oil inlet P.When damper piston 5 is moved to right end and 11 right end wall of valve body mobile cavity
When phase apical grafting, liquid flow sound is stopped, and the hydraulic pressure of reset spring chamber 3c and the hydraulic pressure of oil inlet P are equal at this time, due to
The effect of 42 pretightning force of reset spring spring, make the carrying of 41 left end of spool pressure be greater than right end, thus push spool 41 to
It moves right, sealing bulb 413 with the circular arc camber hole of valve seat 2 sealing apical grafting cooperation, closes oil inlet P and oil return inlet T again
Interface channel.The present invention also has an of short duration opening procedure, but is shut off at once in normal revolution.So as to
It is steady to play the role of starting, absorption pressure pulse when braking.
Increase of the present invention is provided with damper piston, and valve body two and spool are formed with damping hole, and damper piston is sleeved on
On valve body two, by damper piston move to right and the throttling action of damping hole, open spool using the pressure difference of oil pressure, buffering
After the moving to right of piston, using the balance of spool both ends oil pressure and the collective effect of reset spring spring spool is in and closes
Closed state.The size of damping hole of the invention can determine the size of fluid flow, and then can determine the time of buffering, pass through buffering
The design structure of formula plays the role of starting steadily, brakes absorption pressure pulse.Protection system safety, improves system operability
Energy.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not limited to
Form disclosed herein should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification and ring
Border, and can within that scope of the inventive concept describe herein, modifications can be made through the above teachings or related fields of technology or knowledge.
And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be in right appended by the present invention
It is required that protection scope in.
Claims (8)
1. a kind of overflow valve in engineering machinery, which is characterized in that including valve body (1), valve seat (2), valve body two (3), determine
Position block (7), valve hole part (4) and damper piston (5), the valve body two (3) are located at valve body (1) inside, valve seat (2) and locating piece
(7) it is located at the both ends of valve body two (3), the valve hole part (4) is located at valve body two (3) inside, and the valve body (1) includes movement
Chamber (11), the damper piston (5) sliding, damper piston (5) in mobile cavity (11) are located at valve body two (3) outer circumference surface
On, damper piston (5) and the locating piece (7) for being mounted on valve body (1) left port are formed with cushion chamber (5a).
2. a kind of overflow valve in engineering machinery according to claim 1, it is characterised in that: the valve hole part
It (4) include spool (41), reset spring spring (42) and adjusting bolt (43)；The spool (41) and reset spring spring (42)
It is mounted in valve body two (3), the rear port in valve body two (3) is arranged in adjusting bolt (43), the reset spring spring (42)
Both ends are mutually pressed with spool (41) and adjusting bolt (43) respectively, and adjusting bolt (43) can adjustable diameter and screw adjusting reset spring spring (42)
Pre-tightening tension, the axial hole of the valve hole part is the axis hole (41a) being formed with along spool (41) axle center；The cushion chamber (5a)
The axial hole of the damping hole one (31) and valve hole part (4) that are formed with through valve body two (3) is connected with the oil inlet of valve body.
3. a kind of overflow valve in engineering machinery according to claim 2, it is characterised in that: the valve body two (3)
Be formed with successively through-flow chamber (3a), pilot hole (3b) and reset spring chamber (3c), the spool (41) be formed with valve head (411) and
Valve rod (412), valve head (411) are located in the flow cavity (3a) of front, and valve rod (412) the liquid sealing is slided with pilot hole (3b)
It matches, and one end of valve rod (412) extend into reset spring chamber (3c) and is fitted in answering in reset spring chamber (3c)
Position spring spring (42) mutually match by top, and the damping hole one (31) is located at the back segment of valve body two (3) reset spring chamber (3c), the stream
Dynamic chamber (3a) is formed with the oil outlet (32) of connection valve body oil return opening (T).
4. a kind of overflow valve in engineering machinery according to claim 3, it is characterised in that: the spool axis hole
(41a) is formed with damping hole two (41b), and the import of spool axis hole (41a) is in gradually small funneling bellmouth (41c).
5. a kind of overflow valve in engineering machinery according to claim 4, it is characterised in that: the valve rod (412)
On be formed with convex surface (412a), convex surface (412a) cutting ferrule apical grafting has pressure pad (6), and the front end of the reset spring spring (42) is through pressing
Power pad (6) is mutually pushed up with spool (41) matches.
6. a kind of overflow valve in engineering machinery according to claim 5, it is characterised in that: the valve seat (2) is solid
Surely it is fitted in the front end of valve body two (3), valve seat (2) is formed with the connecting hole of connection valve body oil inlet (P) and spool axis hole (41a)
(21), connecting hole (21), which expands to be formed with, seals the circular arc camber hole matched with the sealing bulb (413) of valve head (411).
7. a kind of overflow valve in engineering machinery according to claim 6, it is characterised in that: the locating piece (7)
Fixing seal is mounted on the left port of valve body (1), and locating piece (7) is formed with the pilot hole containing internal screw thread, the adjusting bolt
(43) external screw thread is matched with the connection of the internal screw thread spiral of pilot hole, the expansion of the rear end face and pilot hole of the valve body two (3)
Hole face (7a) phase apical grafting.
8. a kind of overflow valve in engineering machinery according to claim 7, it is characterised in that: the damper piston
(5) periphery wall is slidingly sealed with valve body mobile cavity (11) internal perisporium and matches, and valve body mobile cavity (11) right end wall is provided with communicating valve
The oil circuit (12) of body oil return opening (T).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811256601.3A CN109236777A (en) | 2018-10-26 | 2018-10-26 | A kind of overflow valve in engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811256601.3A CN109236777A (en) | 2018-10-26 | 2018-10-26 | A kind of overflow valve in engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109236777A true CN109236777A (en) | 2019-01-18 |
Family
ID=65082307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811256601.3A Pending CN109236777A (en) | 2018-10-26 | 2018-10-26 | A kind of overflow valve in engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109236777A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110282134A (en) * | 2019-07-10 | 2019-09-27 | 河海大学常州校区 | A kind of aerial dispensing buffer platform |
| CN110878775A (en) * | 2019-11-26 | 2020-03-13 | 贵州凯星液力传动机械有限公司 | Novel hydraulic buffer valve |
-
2018
- 2018-10-26 CN CN201811256601.3A patent/CN109236777A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110282134A (en) * | 2019-07-10 | 2019-09-27 | 河海大学常州校区 | A kind of aerial dispensing buffer platform |
| CN110878775A (en) * | 2019-11-26 | 2020-03-13 | 贵州凯星液力传动机械有限公司 | Novel hydraulic buffer valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190118 |