CN111271328B - Brake buffer valve with one-way valve core - Google Patents

Brake buffer valve with one-way valve core Download PDF

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Publication number
CN111271328B
CN111271328B CN202010303161.3A CN202010303161A CN111271328B CN 111271328 B CN111271328 B CN 111271328B CN 202010303161 A CN202010303161 A CN 202010303161A CN 111271328 B CN111271328 B CN 111271328B
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China
Prior art keywords
hole
valve core
inner hole
valve seat
outer shaft
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CN111271328A (en
Inventor
胡万强
刘国红
董永强
姚宁
王安梅
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Zhixing Technology (Hangzhou) Co.,Ltd.
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Xuchang University
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Priority to CN202010303161.3A priority Critical patent/CN111271328B/en
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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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • 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
    • F15B13/027—Check valves

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a brake buffer valve with a one-way valve core, which comprises a valve sleeve with a second oil port; the pilot valve seat is provided with a first damping hole and is arranged at the left end of the valve sleeve; the pilot valve core is positioned in the pilot valve seat and can axially slide; the main valve seat is provided with a first oil port and is arranged at the right end of the valve sleeve; a main valve element extending into the main valve seat; the one-way valve core is provided with a second damping hole and is positioned in the main valve core; the invention has simple structure and convenient processing, and is mainly used for overload overflow protection and reverse oil supplement protection caused by inertia effect when the hydraulic cylinder brakes.

Description

Brake buffer valve with one-way valve core
Technical Field
The invention relates to the technical field of pressure control elements of hydraulic systems, in particular to a brake buffer valve with a one-way valve core, which is mainly used for overload overflow protection and reverse oil supplement protection caused by inertia effect when a hydraulic cylinder brakes.
Background
In the process of pushing the load to move by the hydraulic cylinder, if braking is carried out under the conditions of heavy load and high running speed, the load can drive the piston of the hydraulic cylinder to continuously move forwards due to the inertia effect, so that the pressure in one cavity of the hydraulic cylinder is suddenly increased, a high pressure peak value is generated, and the instantaneous pressure impact can not only cause vibration and noise, but also damage a sealing device, a pipeline and a hydraulic element; the effective acting area of the other cavity of the hydraulic cylinder is increased, but because the oil supply is stopped, the cavity forms negative pressure, and cavitation is caused.
Therefore, in order to avoid the above situation, it is necessary to smoothly change the hydraulic cylinder from the moving state to the stationary state in response to the abnormally high pressure and the negative pressure occurring in the oil passage.
Disclosure of Invention
Aiming at the problems, the invention provides a brake buffer valve with a one-way valve core, which is mainly used for overload overflow protection and reverse oil supplement protection caused by inertia effect when a hydraulic cylinder brakes.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a brake buffer valve with a one-way valve core comprises a valve sleeve, a pilot valve seat, a pilot valve core, a main valve seat, a main valve core and the one-way valve core;
the valve sleeve is cylindrical, a ring groove is formed in the inner periphery of the valve sleeve, and a first inner hole, a second inner hole and a second oil port are formed in the valve sleeve;
the pilot valve seat is installed at the left end of the valve sleeve and comprises a first outer shaft, a second outer shaft, a third outer shaft and a fourth outer shaft which are different in size, a first through-flow hole, a first inner hole, a first damping hole, a second inner hole, a third inner thread, a first sealing groove and a second sealing groove which are distributed in an axial symmetry mode, wherein the first outer shaft is larger than the third outer shaft in diameter, the third outer shaft is larger than the second outer shaft in diameter, the first outer shaft is matched with the first inner hole of the valve sleeve, the second outer shaft and the first inner hole of the valve sleeve form a first through-flow cavity, and the third outer shaft and the first inner hole of the valve sleeve form a second through-flow cavity;
the pilot valve core is arranged in the pilot valve seat and can axially slide, and comprises a first shaft, a second shaft and a first conical surface, wherein the second shaft is matched with the inner hole in the pilot valve seat, and the first conical surface is propped against the right end surface of the second inner hole in the pilot valve seat and extends into the third inner hole;
the main valve seat is arranged at the right end of the valve sleeve and comprises a first outer shaft, a second outer shaft, a third outer shaft, a left hole, a taper hole, a right hole, a third sealing groove and first radial holes which are symmetrically distributed and have different diameters, wherein the second outer shaft is matched with a first inner hole of the valve sleeve, the third outer shaft extends into a second inner hole of the valve sleeve, the right end face of the third outer shaft is flush, and the left hole is matched with the outer shaft of the pilot valve seat;
the main valve core is characterized by comprising a left section end, a right section shaft, a middle section shaft, a third inner hole, a fourth inner hole, a fifth inner hole, a sixth inner hole, a second radial hole vertically communicated with the fourth inner hole, a third radial hole vertically communicated with the third inner hole and a fourth sealing groove, wherein the diameter of the left section end is the same as that of the right section shaft, the left section end is inserted into the first inner hole of the pilot valve seat, the right end surface of the middle section shaft is propped against the taper hole of the main valve seat, the right section shaft is matched with the right hole of the main valve seat, the left section end, the end surface of the pilot valve seat and the left hole of the main valve seat form a third through flow cavity, and the third inner hole forms a first oil port;
the one-way valve core is installed in the main valve core and comprises a first external thread, a shaft, a second conical surface, a second through-flow hole, a second damping hole, a second internal thread and a fifth sealing groove, wherein the shaft is matched with a fifth inner hole of the main valve core, the second conical surface abuts against the left end face of a third inner hole of the main valve core, the shaft, the second conical surface and the fourth inner hole form a fourth through-flow cavity, and in addition, the diameter of the second damping hole is smaller than that of the first damping hole.
Preferably, the check valve further comprises a threaded sleeve, and the threaded sleeve is connected to the first external thread of the check valve core in a threaded fit mode.
Preferably, the pilot valve seat further comprises an adjusting screw, the adjusting screw is provided with a hexagonal hole, a second external thread and a blind hole, and the adjusting screw is in threaded fit connection with the first internal thread of the pilot valve seat through the second external thread.
Preferably, the adjusting device further comprises a locking nut, and the locking nut is connected to the second outer thread of the adjusting screw through thread matching.
Preferably, the check valve further comprises a blocking block, the blocking block is connected with the second internal thread of the one-way valve core in a threaded fit mode, and a through hole is formed in the middle of the blocking block.
Preferably, the check valve further comprises a first spring, a second spring, a third spring and a fourth spring, wherein one end of the first spring extends into and abuts against the blind hole of the adjusting screw, the other end of the first spring abuts against the two end faces of the shaft of the pilot valve core, one end of the second spring extends into and abuts against the first inner hole of the pilot valve seat, the other end of the second spring is in contact with the main valve core, one end of the third spring abuts against the threaded sleeve, the other end of the third spring extends into and abuts against the sixth inner hole of the main valve core, one end of the fourth spring abuts against the blocking block, and one end of the fourth spring abuts against the steel ball in a conical hole formed by a second internal thread of the check valve core and the second damping hole.
In a preferable scheme, the valve further comprises a sealing ring I, a sealing ring II, a sealing ring III, a sealing ring IV and a sealing ring V, wherein the sealing ring I is installed in a first sealing groove of the pilot valve seat, the sealing ring II is installed in a second sealing groove of the pilot valve seat, the sealing ring III is installed in a third sealing groove of the main valve seat, the sealing ring IV is installed in a fourth sealing groove of the main valve element, and the sealing ring V is installed in a fifth sealing groove of the one-way valve element;
preferably, the clamping spring is installed in the annular groove of the valve sleeve, and the diameter of the inner ring of the clamping spring is smaller than that of the outer shaft of the pilot valve seat.
The invention has simple structure and convenient processing, and is mainly used for overload overflow protection and reverse oil supplement protection caused by inertia effect when the hydraulic cylinder brakes.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural view of a valve housing according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a pilot valve seat according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a pilot valve core according to an embodiment of the present invention;
FIG. 5 is a schematic view of a main valve seat according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a main spool configuration according to an embodiment of the present invention;
FIG. 7 is a schematic view of a one-way valve cartridge according to an embodiment of the present invention;
fig. 8 is an application example of the embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a brake buffer valve with a one-way valve core comprises a valve sleeve 1, a pilot valve seat 2, a pilot valve core 3, a main valve seat 4, a main valve core 5 and a one-way valve core 6;
as shown in fig. 2, the valve sleeve 1 is cylindrical and is characterized by a ring groove 101, a first inner hole 102, a second inner hole 103, and a second oil port T;
as shown in fig. 3, the pilot valve seat 2 is installed at the left end of the valve sleeve 1, and its shape characteristics include a first outer shaft 201, a second outer shaft 202, a third outer shaft 204, a fourth outer shaft 205 with different sizes, and further includes a first through-flow hole 203, a first inner hole 206, a first damping hole 207, a second inner hole 208, a third inner hole 210, a first internal thread 209, a first sealing groove M1, and a second sealing groove M2, which are axisymmetrically distributed, wherein the diameter of the first outer shaft 201 is greater than that of the third outer shaft 204, the diameter of the third outer shaft 204 is greater than that of the second outer shaft 202, the first outer shaft 201 is matched with the first inner hole 102 of the valve sleeve 1, the second outer shaft 202 forms a first through-flow cavity a with the first inner hole 102 of the valve sleeve 1, and the third outer shaft 204 forms a second through-flow cavity b with the first inner hole 102 of the valve sleeve 1;
as shown in fig. 4, the pilot valve element 3 is mounted in the pilot valve seat 2 and can slide axially, and its shape characteristics include a first shaft 301, a second shaft 302, and a first conical surface 303, where the second shaft 302 is matched with the second inner hole 208 in the pilot valve seat 2, and the first conical surface 303 abuts against the right end face of the second inner hole 208 in the pilot valve seat 2 and extends into the third inner hole 210;
as shown in fig. 5, the main valve seat 4 is installed at the right end of the valve housing 1, and is characterized by comprising a first outer shaft 401, a second outer shaft 403, a third outer shaft 404, a left hole 407, a tapered hole 406, a right hole 405, a third sealing groove M3, and first radial holes 402 which are symmetrically distributed, wherein the second outer shaft 403 is matched with the first inner hole 102 of the valve housing 1, the third outer shaft 404 extends into the second inner hole 103 of the valve housing 1 and has a flush right end face, and the left hole 407 is matched with the outer shaft four 205 of the pilot valve seat 2;
as shown in fig. 6, the characteristic shape of the main valve core 5 includes a left section end 501 and a right section shaft 505, a middle section shaft 504, a third inner hole 506, a fourth inner hole 507, a fifth inner hole 508, a sixth inner hole 509, a second radial hole 502 vertically communicating with the fourth inner hole 507, a third radial hole 510 vertically communicating with the third inner hole 506, and a fourth seal groove M4, wherein the left section end 501 and the right section shaft 505 have the same diameter, the left section end 501 is inserted into the first inner hole 206 of the pilot valve seat 2, the right end face of the middle section shaft 504 is pressed against the taper hole 406 of the main valve seat 4, the right section shaft 505 is matched with the right hole 405 of the main valve seat 4, the left section end 501 forms a third flow cavity c with the end face of the pilot valve seat 2 and the left hole 407 of the main valve seat 4, and the third inner hole 506 forms a first oil port B;
as shown in fig. 7, the check valve element 6 is installed in the main valve element 5, and its characteristic shape includes a first external thread 601, a shaft 602, a second conical surface 603, a second through-flow hole 604, a second damping hole 605, a second internal thread 606, and a fifth sealing groove M5, wherein the shaft 602 is fitted with the fifth inner hole 508 of the main valve element 5, the second conical surface 603 is pressed against the left end face of the third inner hole 506 of the main valve element 5, the shaft 602, the second conical surface 603, and the fourth inner hole 507 form a fourth through-flow cavity d, and in addition, the diameter of the second damping hole 605 is smaller than the diameter of the first damping hole 207;
as shown in fig. 1, the check valve further comprises a threaded sleeve 7, wherein the threaded sleeve 7 is connected to the first external thread 601 of the check valve core 6 through threaded fit;
as shown in fig. 1, the pilot valve seat further comprises an adjusting screw 8, wherein the adjusting screw 8 is provided with a hexagonal hole 801, a second external thread 802 and a blind hole 803, and the adjusting screw 8 is in threaded fit connection with the first internal thread 209 of the pilot valve seat 2 through the second external thread 802;
as shown in fig. 1, the adjusting device further comprises a lock nut 12, wherein the lock nut 12 is connected to the second external thread 802 of the adjusting screw 8 through thread fit;
as shown in fig. 1, the check valve further comprises a blocking block 16, the blocking block 16 is connected with the second internal thread 606 of the one-way valve core 6 in a threaded fit manner, and a through hole 1601 is arranged in the middle of the blocking block 16;
as shown in fig. 1, the check valve further includes a first spring 9, a second spring 10, a third spring 11, and a fourth spring 15 (with weak elasticity), wherein one end of the first spring 9 extends into and abuts against the blind hole 803 of the adjusting screw 8, the other end of the first spring abuts against the end surface of the second shaft 302 of the pilot valve element 3, one end of the second spring 10 extends into and abuts against the first inner hole 206 of the pilot valve seat 2, the other end of the second spring contacts with the main valve element 5, one end of the third spring 11 abuts against the threaded sleeve 7, the other end of the third spring extends into and abuts against the sixth inner hole 509 of the main valve element 5, one end of the fourth spring 15 abuts against the blocking block 16, and one end of the fourth spring abuts against the steel ball 14 in a tapered hole formed by a second internal thread 606 of the check valve element 6 and a second damping hole 605;
as shown in fig. 1, the check valve further includes a seal ring I, a seal ring II, a seal ring III, a seal ring IV, and a seal ring V, wherein the seal ring I is installed in a first seal groove M1 of the pilot valve seat 2, the seal ring II is installed in a second seal groove M2 of the pilot valve seat 2, the seal ring III is installed in a third seal groove M3 of the main valve seat 4, the seal ring IV is installed in a fourth seal groove M4 of the main valve element 5, and the seal ring V is installed in a fifth seal groove M5 of the check valve element 6;
as shown in fig. 1, the pilot valve further comprises a clamp spring 13, wherein the clamp spring 13 is installed in the annular groove 101 of the valve sleeve 1, and the diameter of the inner ring of the clamp spring 13 is smaller than that of the outer shaft 201 of the pilot valve seat 2.
Fig. 8 is an application example of the embodiment of the present invention. In the application example, the first oil port B is connected to an oil circuit of a rod cavity of the hydraulic cylinder, and the second oil port T is connected to an oil tank.
For example, when the hydraulic cylinder normally moves forward, the oil passes through the first oil port B, the second through-hole 604 and the second orifice 605 to jack the steel ball 14, flows through the through-hole 1601 to the chamber e composed of the first inner hole 206 of the pilot valve seat 2, the main valve element 5 and the check valve element 6, flows through the first orifice 207 and the third inner hole 210 from the chamber e, and acts on the first conical surface 303 of the pilot valve element 3, and at this time, the oil pressure is small, and the thrust of the first spring 9 to the pilot valve element 3 cannot be overcome. At the moment, the oil is static, so the pressure P of the cavity B of the first oil portBAnd e chamber pressure PeApproximately equal due to the effective active area A of the e-chambereEffective action area A with first oil port B cavity1Equal, so for main spool 5, due to PBⅹA1= PeⅹAeNamely, the two ends have the same acting force, so the oil outlet can not move, and the first oil port B and the second oil port T are not communicated. If the reversing valve is suddenly reversed to be in the middle position and the working load is larger, the load drives the hydraulic cylinder piston to continuously forward due to the inertia effect, and the pressure P of the first oil port BBThe oil pressure in the inner bore three 210 rises along with the rising, the pilot valve core 3 is pushed to move towards the direction of the first spring 9 by overcoming the acting force of the first spring 9, the pilot valve port is opened, the pilot oil enters the second oil port T from the first oil port B along the second through hole 604, the second damping hole 605, the through hole 1601, the first damping hole 207, the first through hole 203, the first through cavity a and the second through cavity B, and the oil flow rate of the first damping hole 207 is larger than that of the second damping hole 605 at the moment, and the pressure P of the e cavity is larger than that of the oil flow rate of the second damping hole 605 at the momenteIs less than the pressure P of the first oil port B cavityBThe main valve core 5 drives the one-way valve core 6 to overcome the acting force of the second spring 10 and move towards the direction of the second spring 10, the main oil way oil flows back to the oil tank from the first oil port B, the third radial hole 510, the third through flow cavity c and the second oil port T, pressure impact caused by inertia during load braking is absorbed, effective buffering during load braking is achieved, the oil flows away, the pressure of the first oil port B is reduced, the main valve core 5 recovers under the action of the second spring 10, and a channel of the first oil port B and the second oil port T is cut off.
For example, when the hydraulic cylinder moves backwards, if the reversing valve is suddenly reversed to be in the middle position and the working load is large, due to the inertia effect, the load pushes the piston of the hydraulic cylinder to continuously move forwards, the area of the rod cavity is increased, negative pressure occurs, oil must be supplemented, otherwise cavitation is easily caused, and the hydraulic element is damaged. At this time, since the pressure of the first port B is a negative value, the oil of the second port T acts on the check valve element 6 through the third through-flow cavity c and the fourth through-flow cavity d, and since the effective acting area of the right end of the fourth through-flow cavity d is larger than that of the left end, the check valve element 6 overcomes the acting force of the third spring 11 to move towards the direction of the first port B, the fourth through-flow cavity d is communicated with the first port B, and the oil flows into the first port B, so that unidirectional oil supplement is realized.
Furthermore, it should be noted that all equivalent or simple changes made to the structure, features and principles described in the present patent concept are included in the protection scope of the present patent.

Claims (8)

1. A brake buffer valve with a one-way valve core is characterized by comprising a valve sleeve (1), a pilot valve seat (2), a pilot valve core (3), a main valve seat (4), a main valve core (5) and a one-way valve core (6);
the valve sleeve (1) is cylindrical, a ring groove (101) is formed in the valve sleeve (1) along the inner periphery of the valve sleeve, and the valve sleeve (1) is provided with a first inner hole (102), a second inner hole (103) and a second oil port (T);
the pilot valve seat (2) is arranged at the left end of the valve sleeve (1), the pilot valve seat (2) comprises a first outer shaft (201), a second outer shaft (202), a third outer shaft (204) and a fourth outer shaft (205) which are different in size, and further comprises a first through flow hole (203), a first inner hole (206), a first damping hole (207), a second inner hole (208), a third inner hole (210), a first internal thread (209), a first sealing groove (M1) and a second sealing groove (M2) which are distributed in an axial symmetry manner, wherein the outer shaft one (201) diameter is greater than the outer shaft three (204) diameter, the diameter of the outer shaft III (204) is larger than that of the outer shaft II (202), the outer shaft I (201) is matched with the first inner hole (102) of the valve sleeve (1), the outer shaft II (202) and the first inner hole (102) of the valve sleeve (1) form a first through-flow cavity (a), the outer shaft III (204) and the first inner hole (102) of the valve sleeve (1) form a second through-flow cavity (b);
the pilot valve core (3) is installed in the pilot valve seat (2) and can axially slide, and comprises a first shaft (301), a second shaft (302) and a first conical surface (303), wherein the second shaft (302) is matched with a second inner hole (208) in the pilot valve seat (2), and the first conical surface (303) is propped against the right end surface of the second inner hole (208) in the pilot valve seat (2) and extends into a third inner hole (210);
the main valve seat (4) is installed at the right end of the valve sleeve (1) and comprises a first outer shaft (401), a second outer shaft (403), a third outer shaft (404), a left hole (407), a taper hole (406), a right hole (405), a third sealing groove (M3) and first radial holes (402) which are symmetrically distributed and have different diameters, wherein the second outer shaft (403) is matched with a first inner hole (102) of the valve sleeve (1), the third outer shaft (404) extends into a second inner hole (103) of the valve sleeve (1) and is flush with the right end face, and the left hole (407) is matched with an outer shaft four (205) of the pilot valve seat (2);
the main valve core (5) comprises a left section end (501), a right section shaft (505), a middle section shaft (504), a third inner hole (506), a fourth inner hole (507), a fifth inner hole (508), a sixth inner hole (509), a second radial hole (502) vertically communicated with the fourth inner hole (507), a third radial hole (510) vertically communicated with the third inner hole (506), and a fourth sealing groove (M4), wherein the left section end (501) and the right section shaft (505) have the same diameter, the left section end (501) is inserted into the first inner hole (206) of the pilot valve seat (2), the right end face of the middle section shaft (504) is propped against the taper hole (406) of the main valve seat (4), the right section shaft (505) is matched with the right hole (405) of the main valve seat (4), and the left section end (501) and the end face of the pilot valve seat (2) and the left hole (407) of the main valve seat (4) form a third flow passage cavity (c), and the third inner bore (506) forms a first oil port (B);
install one-way valve core (6) in main valve core (5), including first external screw thread (601), axle (602), conical surface two (603), second through-flow hole (604), second damping hole (605), second internal thread (606), fifth seal groove (M5), wherein, axle (602) with the fifth hole (508) of main valve core (5) cooperate, and conical surface two (603) top is in the left end face of the third hole (506) of main valve core (5), axle (602), conical surface two (603) with fourth hole (507) form fourth cross flow chamber (d), and in addition, second damping hole (605) diameter is less than first damping hole (207) diameter.
2. The brake buffering valve with the one-way valve core as recited in claim 1, further comprising a threaded sleeve (7), wherein the threaded sleeve (7) is connected to the first external thread (601) of the one-way valve core (6) through threaded fit.
3. The brake buffering valve with the one-way valve core as recited in claim 2, further comprising an adjusting screw (8), wherein the adjusting screw (8) is provided with a hexagonal hole (801), a second external thread (802) and a blind hole (803), and the adjusting screw (8) is in threaded fit connection with the first internal thread (209) of the pilot valve seat (2) through the second external thread (802).
4. The brake trim valve with the one-way valve core according to claim 3, characterized in that the brake trim valve further comprises a lock nut (12), and the lock nut (12) is connected to the second external thread (802) of the adjusting screw (8) through thread fit.
5. The brake cushion valve with the one-way valve core is characterized by further comprising a blocking piece (16), wherein the blocking piece (16) is connected with the second internal thread (606) of the one-way valve core (6) in a threaded fit mode, and a through hole (1601) is formed in the middle of the blocking piece (16).
6. The brake buffering valve with the one-way valve core as claimed in claim 5, characterized by further comprising a first spring (9), a second spring (10), a third spring (11), and a fourth spring (15), one end of the first spring (9) extends into and abuts against the blind hole (803) of the adjusting screw (8), the other end abuts against the end face of the second shaft (302) of the pilot valve core (3), one end of the second spring (10) extends into and abuts against the first inner hole (206) of the pilot valve seat (2), the other end of the second spring is contacted with the main valve core (5), one end of the third spring (11) is abutted against the threaded sleeve (7), the other end of the third spring extends into and is abutted against a sixth inner hole (509) of the main valve core (5), one end of the fourth spring (15) is propped against the blocking block (16), and one end of the fourth spring props the steel ball (14) against a conical hole formed by a second internal thread (606) and a second damping hole (605) of the one-way valve core (6).
7. The brake cushion valve with the one-way valve core as claimed in claim 1, further comprising a seal ring I, a seal ring II, a seal ring III, a seal ring IV and a seal ring V, wherein the seal ring I is installed in a first seal groove (M1) of the pilot valve seat (2), the seal ring II is installed in a second seal groove (M2) of the pilot valve seat (2), the seal ring III is installed in a third seal groove (M3) of the main valve seat (4), the seal ring IV is installed in a fourth seal groove (M4) of the main valve core (5), and the seal ring V is installed in a fifth seal groove (M5) of the one-way valve core (6).
8. The Bumper valve with the one-way valve core as claimed in claim 1, further comprising a clamp spring (13), wherein the clamp spring (13) is installed in the annular groove (101) of the valve sleeve (1), and the diameter of the inner circle of the clamp spring is smaller than the diameter of the outer shaft I (201) of the pilot valve seat (2).
CN202010303161.3A 2020-04-17 2020-04-17 Brake buffer valve with one-way valve core Active CN111271328B (en)

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Application Number Priority Date Filing Date Title
CN202010303161.3A CN111271328B (en) 2020-04-17 2020-04-17 Brake buffer valve with one-way valve core

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Application Number Priority Date Filing Date Title
CN202010303161.3A CN111271328B (en) 2020-04-17 2020-04-17 Brake buffer valve with one-way valve core

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CN111271328A CN111271328A (en) 2020-06-12
CN111271328B true CN111271328B (en) 2021-11-05

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CN111852975B (en) * 2020-06-24 2022-09-09 合肥长源液压股份有限公司 Buffer valve for reducing start-stop impact of hydraulic actuating mechanism

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001036852A1 (en) * 1999-11-15 2001-05-25 Mannesmann Rexroth Ag Pressure limiting valve
CN1427184A (en) * 2001-12-18 2003-07-02 沃尔沃建造设备控股（瑞典）有限公司 Hydraulic safety valve
CN202597816U (en) * 2012-05-14 2012-12-12 宁波海宏液压有限公司 Overload oil-supplement valve
CN203670326U (en) * 2013-12-18 2014-06-25 常德中联重科液压有限公司 Overflow valve with oil supplementation function
CN206092583U (en) * 2016-08-31 2017-04-12 宁波海宏液压有限公司 Oily relief valve is mended to compact

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001036852A1 (en) * 1999-11-15 2001-05-25 Mannesmann Rexroth Ag Pressure limiting valve
CN1427184A (en) * 2001-12-18 2003-07-02 沃尔沃建造设备控股（瑞典）有限公司 Hydraulic safety valve
CN202597816U (en) * 2012-05-14 2012-12-12 宁波海宏液压有限公司 Overload oil-supplement valve
CN203670326U (en) * 2013-12-18 2014-06-25 常德中联重科液压有限公司 Overflow valve with oil supplementation function
CN206092583U (en) * 2016-08-31 2017-04-12 宁波海宏液压有限公司 Oily relief valve is mended to compact

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