CN210127987U - Hydraulic control two-way reversing valve and load holding module - Google Patents
Hydraulic control two-way reversing valve and load holding module Download PDFInfo
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- CN210127987U CN210127987U CN201920963637.9U CN201920963637U CN210127987U CN 210127987 U CN210127987 U CN 210127987U CN 201920963637 U CN201920963637 U CN 201920963637U CN 210127987 U CN210127987 U CN 210127987U
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Abstract
The utility model discloses a hydraulic control two-way reversing valve, load keep module belongs to engineering machine tool hydraulic system technical field. An oil port A1 of the multi-way valve is connected with an oil passage A of the load holding module; an oil duct B of the load maintaining module is connected with a large cavity of the movable arm oil cylinder, an oil duct DR of the load maintaining module is connected with an oil tank, and an oil duct Pi of the load maintaining module is connected with a descending pilot pressure oil duct of the multi-way valve; and a small cavity of the boom cylinder is connected with a B1 oil port of the multi-way valve. The area ratio of the cover gasket to the pilot valve core in the hydraulic control two-way reversing valve can reach 1:64, and the control is simple and convenient; by utilizing the holding function of the holding valve, the internal leakage amount can be controlled to be zero, and the load can be kept at a constant position and does not fall along with the change of time; the pilot-operated two-way reversing valve plays a pilot stage role in the holding valve, so that the small cone valve core frequently acts under pilot pressure, and the phenomena of fracture and the like cannot occur.
Description
Technical Field
The utility model relates to an engineering machine tool hydraulic system technical field specifically is a module is kept to hydraulic control two-way switching-over valve, load for actuating mechanism's load keeps.
Background
The engineering machinery has wide application range, and the complexity of the work of a hydraulic system is determined by different applications and complex working conditions. For many hydraulic system actuators to be kept constant at a certain position, the following solutions are common:
1. for hydraulic systems requiring high-end and precision, this is achieved by balancing valves;
2. the fit clearance between the valve rod and the valve core of the multi-way valve is controlled, and the neutral position function of the multi-way valve is utilized to realize the control;
3. the actuator adds a hydraulic lock.
In practical conditions, the scheme has the following problems:
the scheme 1 is realized through a balance valve in the system, has high required precision and accurate position, is suitable for engineering machinery of high-altitude operation vehicles and telescopic boom fork loaders, is not practical for medium and small tonnage excavators and loaders, and has very high cost;
the scheme 2 is a very common scheme for small and medium tonnage excavators and loaders, and is realized by controlling the fit clearance between the valve rod and the valve body central hole and indirectly controlling the leakage amount. Theoretically, if a gap exists, the leakage amount exists, if the leakage exists, the execution element declines along with time, and bad experience may be brought to a user; if the clearance between the valve rod and the valve body is made small enough, valve jamming may occur during the actuation of the actuator, which is prone to malfunction of the hydraulic system, particularly under high pressure conditions, and may cause various levels of damage to other components of the hydraulic system. For the hydraulic valve, the difficulty is brought to the processing of the valve body and the valve rod, the difficulty is increased to the assembly, the fault point is increased to the test, and therefore the qualified rate is reduced.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a liquid accuse two-way reversing valve, load keep module and load keep system.
The utility model discloses a following technical scheme realizes: a hydraulic control two-way reversing valve comprises an end cover, wherein a step mounting hole is formed in the end cover, and an oil duct a, an oil duct b and an oil duct DR which are communicated with the step mounting hole are formed in the side face of the end cover;
a valve sleeve is arranged in the end cover step mounting hole, and a valve body I is fixedly arranged at the outer end of the end cover step mounting hole;
the valve body I is provided with a stepped hole in the axis, and a valve seat and a cover gasket are sequentially arranged in the stepped hole of the valve body I from outside to inside; the valve seat is fixedly connected with the valve body I, and an oil duct Pi penetrating through the valve seat is formed in the axis of the valve seat; the cover gasket is in sliding fit with the step hole of the valve body I; a spring I is arranged between the inner end of the cover gasket and the bottom of the stepped hole of the valve body I;
a reversing valve core is arranged in the valve sleeve in a sliding manner, and the upper end of the reversing valve core is matched with the inner wall of the valve sleeve in a conical surface manner; a spring II is arranged between the lower end of the reversing valve core and the bottom of the mounting hole of the end cover step;
the upper end of the valve sleeve is provided with a through hole communicated with the upper end of the reversing valve core, and a pilot valve core is slidably arranged in the through hole of the valve sleeve; the upper end of the pilot valve core extends out of the through hole at the upper end of the valve sleeve, and the upper end of the pilot valve core is opposite to the cover pad;
when the upper end of the reversing valve core is tightly matched with the inner wall of the valve sleeve, the oil duct a is communicated with the oil duct b; when the cover gasket presses the pilot valve core to push the upper end of the reversing valve core to leave the conical surface of the inner wall of the valve sleeve, the oil duct a is communicated with the oil duct DR.
Preferably: the lower end of the valve body I is provided with an external thread, and the outer end of the mounting hole of the step of the end cover is provided with an external thread; the lower end of the valve body I is installed in an end cover step installation hole through threaded connection; and an O-shaped ring III is arranged between the outer end of the end cover step mounting hole and the valve body I.
Preferably: the upper end of the valve sleeve is provided with a circumferential blocking platform which abuts against a step in the step mounting hole of the end cover; the lower end of the valve body I is tightly pressed on the valve sleeve blocking platform.
Preferably: the outer circumferential surface of the valve sleeve is provided with two mounting grooves which are respectively arranged at two sides of the oil passage b; o type circle I, retaining ring I are installed to the valve barrel mounting groove of oil duct b upside, install O type circle II, retaining ring II in the valve barrel mounting groove of oil duct b downside.
Preferably: the lower end of the valve seat is provided with an external thread, and the outer end of the stepped hole of the valve body I is provided with an external thread; the lower end of the valve seat is installed in a step hole of the valve body I through threaded connection; and an O-shaped ring IV is arranged between the outer end of the stepped hole of the valve body I and the valve seat.
A load holding module further comprising a holding valve;
the holding valve comprises a valve body II, and an oil duct c, an oil duct d, an oil duct A and an oil duct B are formed in the valve body II; the inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected;
the oil duct c is a stepped hole, and a cover plate, a spring III and a retaining valve core are sequentially arranged in the oil duct c from outside to inside; the circumferential surface of the cover plate is matched and connected with the inner wall of the oil duct c, a through hole is formed in the axis of the cover plate, and the inner end of the cover plate abuts against a step in the oil duct c; the outer end of the retaining valve core is provided with a blind hole, the inner end of the spring III is positioned in the blind hole of the retaining valve core, and the outer end of the spring III is sleeved on a boss at the inner end of the cover plate; the inner end of the retaining valve core is a conical surface, and the conical surface at the inner end of the retaining valve core is matched and abutted against the inner end of the oil duct A; a circle of sinking groove is formed on the circumferential surface of the inner end of the holding valve core, and the sinking groove at the inner end of the holding valve core is opposite to the inner end of the oil duct B;
the oil duct c is communicated with an oil duct a of the hydraulic control two-way reversing valve;
and the oil passage d is communicated with an oil passage b of the hydraulic control two-way reversing valve.
Preferably: the periphery of the cover plate is provided with a mounting groove, and an O-shaped ring V and a retaining ring V are mounted in the mounting groove of the cover plate.
Preferably: mounting grooves are formed in the outer ends of the oil ducts a and b on the same side face of the end cover, and O-shaped rings VI are mounted in the mounting grooves in the outer ends of the oil ducts a and b; the side face of the end cover is attached to the side face of the valve body II, and the end cover is connected with the valve body II through a screw; and the oil duct c and the oil duct d on the same side surface of the valve body II are butted with the outer ends of the oil duct a and the oil duct b.
A load maintaining system further comprises a multi-way valve and a movable arm oil cylinder;
an A1 oil port of the multi-way valve is connected with an oil passage A of the load holding module; the oil duct B of the load maintaining module is connected with the large cavity of the movable arm oil cylinder, the oil duct DR of the load maintaining module is connected with the oil tank, and the oil duct Pi of the load maintaining module is connected with the descending pilot pressure oil duct of the multi-way valve; and a small cavity of the boom cylinder is connected with a B1 oil port of the multi-way valve.
Compared with the prior art, the beneficial effects of the utility model are that:
1, the area ratio of a cover gasket to a pilot valve core in the hydraulic control two-way reversing valve can reach 1:64, which means that the pilot pressure is 3MPA, the load with the pressure of 192MPA can be opened, and the operation and the control are simple and convenient;
2, by utilizing the holding function of the holding valve, applying slide valve type pilot control on the holding valve, and simultaneously controlling the internal leakage amount to be zero due to the sealing function of the one-way valve in the hydraulic control two-way reversing valve, so that the load can be kept at a constant position and does not fall along with the change of time;
3, the pilot-operated two-way reversing valve plays a pilot stage role in the holding valve, so that the small-cone valve core frequently acts under pilot pressure, and the phenomena of fracture and the like cannot occur.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and explain the invention without limiting the invention to the proper embodiment and description.
Fig. 1 is a schematic structural view of a hydraulic two-way directional valve according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second load holding module according to an embodiment of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is an enlarged view of the retention valve of FIG. 2;
fig. 5 is a schematic structural diagram of a three-load holding system according to an embodiment of the present invention;
in the figure: 1-a valve seat; 2-O-shaped ring IV; 3-covering and cushioning; 4-spring I; 5-valve body I; 6, a pilot valve core; 7-O-shaped ring III; 8-valve sleeve; 9-O-shaped ring VI; 10-O-shaped ring I; 11-a retainer ring I; 12-O-shaped ring II; 13-retainer ring II; 14-a gasket; 15-a diverter valve core; 16-spring II; 17-end cap; 18-valve body II; 19-a retention spool; 20, a spring III; 21-cover plate; 22-O-ring V; 23-retaining ring V.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1, in the hydraulic control two-way reversing valve, an end cover 17 is square, a vertically downward step mounting hole is formed in the upper end surface of the end cover 17, an oil passage a and an oil passage b which are communicated with the step mounting hole are formed in the left side surface of the end cover 17, and an oil passage DR which is communicated with the step mounting hole is formed in the right side surface of the end cover 17.
The lower end of the valve body I5 is provided with an external thread, the outer end of the step mounting hole of the end cover 17 is provided with an external thread, the lower end of the valve body I5 is installed in the step mounting hole of the end cover 17 through threaded connection, and an O-shaped ring III 7 is installed between the outer end of the step mounting hole of the end cover 17 and the valve body I5. A stepped hole is formed in the axis of the valve body I5, and a valve seat 1 and a cover gasket 3 are sequentially arranged in the stepped hole of the valve body I5 from outside to inside. The axis of the valve seat 1 is provided with an oil passage Pi which penetrates through the valve seat 1. The lower end of the valve seat 1 is provided with an external thread, the outer end of the I5 step hole of the valve body is provided with an external thread, the lower end of the valve seat 1 is installed in the I5 step hole of the valve body through threaded connection, and an O-shaped ring IV 2 is installed between the outer end of the I5 step hole of the valve body and the valve seat 1. The cover gasket 3 is in sliding fit with the I5 step hole of the valve body, and a spring I4 is arranged between the inner end of the cover gasket 3 and the bottom of the I5 step hole of the valve body. Spring I4 gives 3 upward movement of covering pad, keeps 3 upper ends of covering pad and disk seat 1 lower extreme to offset.
The valve sleeve 8 is arranged at the middle lower part of the step mounting hole of the end cover 17, the upper end of the valve sleeve 8 is provided with a circumferential blocking platform, the blocking platform of the valve sleeve 8 is abutted against the step in the step mounting hole of the end cover 17, and the lower end of the valve body I5 is tightly pressed on the blocking platform of the valve sleeve 8 to complete the positioning of the valve sleeve 8. Two mounting grooves are formed in the outer circumferential surface of the valve sleeve 8 and are respectively arranged on two sides of the oil passage b; o-shaped rings I10 and check rings I11 are installed in the valve sleeve 8 installation groove on the upper side of the oil duct b, and O-shaped rings II 12 and check rings II 13 are installed in the valve sleeve 8 installation groove on the lower side of the oil duct b.
A reversing valve core 15 is arranged in the valve sleeve 8 in a sliding mode, and the upper end of the reversing valve core 15 is matched with the inner wall of the upper end of the valve sleeve 8 through a conical surface. A gasket 14 is sleeved at the lower end of the reversing valve core 15, and the gasket 14 abuts against a step at the lower end of the reversing valve core 15; the spring II 16 is sleeved at the lower end of the reversing valve core 15, the upper end of the spring II 16 is abutted against the gasket 14, and the lower end of the spring II 16 is abutted against the bottom surface of the step mounting hole of the end cover 17. The spring II 16 gives an upward movement force to the reversing valve core 15, keeps the upper end conical surface of the reversing valve core 15 matched with the upper end conical surface of the valve sleeve 8, prevents the communication with the oil passage DR, and is equivalent to the action of a one-way valve.
The upper end of the valve sleeve 8 is provided with a through hole communicated with the upper end of the reversing valve core 15, and the through hole of the valve sleeve 8 is provided with a pilot valve core 6 in a sliding way. The upper end of the pilot valve core 6 extends out of the through hole at the upper end of the valve sleeve 8, and the upper end of the pilot valve core 6 is opposite to the cover gasket 3. When the upper end of the reversing valve core 15 is tightly matched with the inner wall of the valve sleeve 8, the oil duct a is communicated with the oil duct b; when the oil passage Pi is filled with oil to push the cover gasket 3 to slide downwards, the cover gasket 3 presses the pilot valve core 6 downwards to push the upper end of the reversing valve core 15 to leave the conical surface of the inner wall of the valve sleeve 8, and the oil passage a is communicated with the oil passage DR.
Example two
On the basis of the first embodiment, as shown in fig. 2 to 4, the load holding module mainly includes a pilot-controlled two-way directional valve and a holding valve.
The holding valve comprises a square valve body II 18. The left side of the valve body II 18 is provided with an oil duct c and an oil duct d, the upper side of the valve body II 18 is provided with an oil duct B, and the right side of the valve body II 18 is provided with an oil duct A. The inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected.
The oil passage c is a stepped hole, and a cover plate 21, a spring III 20 and a retaining valve core 19 are sequentially arranged in the oil passage c from outside to inside. The circumferential surface of the cover plate 21 is matched and connected with the inner wall of the oil passage c, the circumferential surface of the cover plate 21 is provided with a mounting groove, and an O-shaped ring V22 and a retaining ring V23 are mounted in the mounting groove of the cover plate 21. The inner end of the cover plate 21 is abutted against a step in the oil duct c to realize the positioning of the inner end, and the outer end of the cover plate is limited by the end face of the night sky two-way hydraulic control valve. The outer end of the holding valve core 19 is provided with a blind hole, the inner end of the spring III 20 is positioned in the blind hole of the holding valve core 19, and the outer end of the spring III 20 is sleeved on a boss at the inner end of the cover plate 21. The inner end of the valve core 19 is a conical surface, and the conical surface at the inner end of the valve core 19 is matched and abutted against the inner end of the oil duct A under the action of a spring III 20 on the left side, so that the oil duct A is stopped. The circumferential surface of the inner end of the holding valve core 19 is provided with a circle of sinking groove, and the sinking groove of the inner end of the holding valve core 19 is opposite to and communicated with the inner end of the oil duct B.
Mounting grooves are formed in the outer ends of the oil duct a and the oil duct b on the side surface of the end cover 17, and O-shaped rings VI 9 are mounted in the mounting grooves in the outer ends of the oil duct a and the oil duct b; the side face of the end cover 17 is attached to the side face of the valve body II 18, the end cover 17 is connected with the valve body II 18 through screws, and therefore the oil duct c and the oil duct d on the valve body II 18 are in butt joint with the outer ends of the oil duct a and the oil duct b.
EXAMPLE III
On the basis of the second embodiment, as shown in fig. 5, the load holding system includes a load holding module, a multiplex valve, and a boom cylinder. An oil port A1 of the multi-way valve is connected with an oil passage A of the load holding module; an oil duct B of the load maintaining module is connected with a large cavity of the movable arm oil cylinder, an oil duct DR of the load maintaining module is connected with an oil tank, and an oil duct Pi of the load maintaining module is connected with a descending pilot pressure oil duct of the multi-way valve; and a small cavity of the boom cylinder is connected with a B1 oil port of the multi-way valve.
The lifting condition of the movable arm oil cylinder is as follows:
the boom cylinder rises, namely the multi-way valve rises and gives pilot pressure, the multi-way valve principle moves rightwards, pressure oil passes through a port A of a holding valve in the load holding module from a port P of the multi-way valve through a port A1 of the multi-way valve, pushes away a holding valve core 19 in the holding valve, reaches a port B of the holding valve in the load holding module, then enters a large cavity of the boom cylinder and pushes the boom cylinder to move upwards;
meanwhile, the small cavity oil of the boom cylinder returns to the port T of the oil tank through the port B1 of the multi-way valve, and oil circuit circulation is formed.
The holding valve core 19 in the holding valve can be opened only because the rigidity of the spring III 20 of the holding valve is very small, as long as the pressure is larger than the force of the spring III 20, the oil in the spring cavity in the holding valve flows to the hole a of the hydraulic control two-way reversing valve through the oil passage c of the cover plate 21 in the holding valve, flows to the hole B of the hydraulic control two-way reversing valve through the inner hole of the reversing valve core 15 in the hydraulic control two-way reversing valve, and is communicated with the port B of the holding valve through the hole d of the holding valve, so that oil circulation is formed.
Descending condition of a movable arm oil cylinder:
the boom cylinder descends, namely the multi-way valve descends to give pilot pressure, the multi-way valve moves leftwards on the principle, and pressure oil passes through a port P of the multi-way valve and a port B1 of the multi-way valve to reach a small cavity of the boom cylinder to push the boom cylinder to move downwards; meanwhile, the large cavity of the boom cylinder reaches the port B of the holding valve in the load holding module, the holding valve core 19 in the holding valve is opened due to the area difference, and then the holding valve core reaches the port A of the holding valve in the load holding module, and then the holding valve core returns to the port T of the oil tank through the port A1 of the multi-way valve, so that oil circuit circulation is formed.
The reason why the retaining valve core 19 in the retaining valve is opened due to the area difference is that the Pi port in the hydraulic control two-way reversing valve is connected with the descending pilot pressure of the multi-way valve, the DR port in the hydraulic control two-way reversing valve is connected with the oil discharging leakage port of the oil tank, when descending, the pilot pressure pushes the cover gasket 3 in the hydraulic control two-way reversing valve, the pilot valve core 6 is pushed by the spring 4, and then the reversing valve core 15 moves downwards, so that the reversing valve core 15 and the one-way conical surface of the valve sleeve 8 are opened in a sealing manner;
then the oil in the spring cavity in the holding valve flows to the hole a of the hydraulic two-way reversing valve through the hole c of the cover plate 21 in the holding valve, and flows to the DR port oil return tank through the inner hole of the reversing valve core 15 and the sealing position of the one-way conical surface;
the differential area of the holding spool 19 in the holding valve will open;
meanwhile, the reversing valve core 15 in the hydraulic control two-way reversing valve moves downwards, so that the gear positions of the reversing valve core 15 and the valve sleeve 8 are closed.
The movable arm oil cylinder keeps the working condition:
when the boom cylinder is held at a certain constant position
The multi-way valve has no pilot pressure, because of the dead weight of the movable arm oil cylinder and the downward inertia of a heavy object, the pressure of a large cavity of the movable arm oil cylinder is transmitted to a port B of a holding valve in a load holding module, and because a spring 20 in the holding valve pushes a holding valve core 19 to form conical surface sealing, an oil way cannot be communicated with the port A; meanwhile, the port d, the port b, the port a and the port c are communicated, but no oil flows because the conical surface of the valve core 19 is kept sealed, and no oil flows because the one-way conical surface of the reversing valve core 15 and the valve sleeve 8 in the hydraulic control two-way reversing valve is sealed, so that the larger the load is, the tighter the sealing is; since the area ratio of the head gasket to the pilot spool in the pilot operated two-way selector valve is 1:64, meaning that the pilot pressure is 3MPA, a load of 192MPA can be opened.
Claims (8)
1. A hydraulic control two-way reversing valve comprises an end cover (17), wherein a step mounting hole is formed in the end cover (17), and an oil duct a, an oil duct b and an oil duct DR which are communicated with the step mounting hole are formed in the side face of the end cover (17);
the method is characterized in that:
a valve sleeve (8) is installed in the step mounting hole of the end cover (17), and a valve body I (5) is fixedly installed at the outer end of the step mounting hole of the end cover (17);
a stepped hole is formed in the axis of the valve body I (5), and a valve seat (1) and a cover gasket (3) are sequentially arranged in the stepped hole of the valve body I (5) from outside to inside; the valve seat (1) is fixedly connected with the valve body I (5), and an oil duct Pi penetrating through the valve seat (1) is formed in the axis of the valve seat (1); the cover gasket (3) is in sliding fit with the stepped hole of the valve body I (5); a spring I (4) is arranged between the inner end of the cover gasket (3) and the bottom of the step hole of the valve body I (5);
a reversing valve core (15) is arranged in the valve sleeve (8) in a sliding manner, and the upper end of the reversing valve core (15) is matched with the inner wall of the valve sleeve (8) in a conical surface manner; a spring II (16) is arranged between the lower end of the reversing valve core (15) and the bottom of the step mounting hole of the end cover (17);
the upper end of the valve sleeve (8) is provided with a through hole communicated with the upper end of the reversing valve core (15), and the through hole of the valve sleeve (8) is provided with a pilot valve core (6) in a sliding way; the upper end of the pilot valve core (6) extends out of a through hole at the upper end of the valve sleeve (8), and the upper end of the pilot valve core (6) is opposite to the cover pad (3);
when the upper end of the reversing valve core (15) is tightly matched with the inner wall of the valve sleeve (8), the oil duct a is communicated with the oil duct b; when the cover gasket (3) presses the pilot valve core (6) downwards to push the upper end of the reversing valve core (15) to leave the conical surface of the inner wall of the valve sleeve (8), the oil passage a is communicated with the oil passage DR.
2. The hydraulically controlled two-way reversing valve of claim 1, wherein: the lower end of the valve body I (5) is provided with an external thread, and the outer end of the step mounting hole of the end cover (17) is provided with an external thread; the lower end of the valve body I (5) is installed in a step installation hole of the end cover (17) through threaded connection; and an O-shaped ring III (7) is arranged between the outer end of the step mounting hole of the end cover (17) and the valve body I (5).
3. The hydraulically controlled two-way reversing valve of claim 2, wherein: the upper end of the valve sleeve (8) is provided with a circumferential blocking platform, and the blocking platform of the valve sleeve (8) is abutted against a step in a step mounting hole of the end cover (17); the lower end of the valve body I (5) is tightly pressed on the valve sleeve (8) gear table.
4. The hydraulically controlled two-way reversing valve of claim 1, wherein: the outer circumferential surface of the valve sleeve (8) is provided with two mounting grooves which are respectively arranged at two sides of the oil passage b; o-shaped ring I (10) and check ring I (11) are installed in a valve sleeve (8) installation groove on the upper side of the oil duct b, and O-shaped ring II (12) and check ring II (13) are installed in a valve sleeve (8) installation groove on the lower side of the oil duct b.
5. The hydraulically controlled two-way reversing valve of claim 1, wherein: the lower end of the valve seat (1) is provided with an external thread, and the outer end of a step hole of the valve body I (5) is provided with an external thread; the lower end of the valve seat (1) is installed in a step hole of the valve body I (5) through threaded connection; an O-shaped ring IV (2) is arranged between the outer end of the step hole of the valve body I (5) and the valve seat (1).
6. A load holding module using the pilot-controlled two-way selector valve according to any one of claims 1 to 5, characterized in that:
also includes a holding valve;
the holding valve comprises a valve body II (18), and an oil duct c, an oil duct d, an oil duct A and an oil duct B are formed in the valve body II (18); the inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected;
the oil duct c is a stepped hole, and a cover plate (21), a spring III (20) and a retaining valve core (19) are sequentially arranged in the oil duct c from outside to inside; the circumferential surface of the cover plate (21) is connected with the inner wall of the oil duct c in a matching way, the axis of the cover plate (21) is provided with a through hole, and the inner end of the cover plate (21) is abutted against the step in the oil duct c; the outer end of the retaining valve core (19) is provided with a blind hole, the inner end of the spring III (20) is positioned in the blind hole of the retaining valve core (19), and the outer end of the spring III (20) is sleeved on a boss at the inner end of the cover plate (21); the inner end of the retaining valve core (19) is a conical surface, and the conical surface at the inner end of the retaining valve core (19) is matched and abutted against the inner end of the oil duct A; a circle of sinking groove is formed on the circumferential surface of the inner end of the holding valve core (19), and the sinking groove of the inner end of the holding valve core (19) is opposite to the inner end of the oil duct B;
the oil duct c is communicated with an oil duct a of the hydraulic control two-way reversing valve;
and the oil passage d is communicated with an oil passage b of the hydraulic control two-way reversing valve.
7. A load holding module according to claim 6, wherein: the periphery of the cover plate (21) is provided with a mounting groove, and an O-shaped ring V (22) and a retaining ring V (23) are mounted in the mounting groove of the cover plate (21).
8. A load holding module according to claim 6, wherein: mounting grooves are formed in the outer ends of the oil duct a and the oil duct b on the same side face of the end cover (17), and O-shaped rings VI (9) are mounted in the mounting grooves in the outer ends of the oil duct a and the oil duct b; the side surface of the end cover (17) is attached to the side surface of the valve body II (18), and the end cover (17) is connected with the valve body II (18) through a screw; and the oil duct c and the oil duct d on the same side surface of the valve body II (18) are butted with the outer ends of the oil duct a and the oil duct b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920963637.9U CN210127987U (en) | 2019-06-25 | 2019-06-25 | Hydraulic control two-way reversing valve and load holding module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920963637.9U CN210127987U (en) | 2019-06-25 | 2019-06-25 | Hydraulic control two-way reversing valve and load holding module |
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| CN210127987U true CN210127987U (en) | 2020-03-06 |
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| CN201920963637.9U Withdrawn - After Issue CN210127987U (en) | 2019-06-25 | 2019-06-25 | Hydraulic control two-way reversing valve and load holding module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230618A (en) * | 2019-06-25 | 2019-09-13 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic control two way selected valve, load keep module and load holding system |
-
2019
- 2019-06-25 CN CN201920963637.9U patent/CN210127987U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230618A (en) * | 2019-06-25 | 2019-09-13 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic control two way selected valve, load keep module and load holding system |
| CN110230618B (en) * | 2019-06-25 | 2024-05-28 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic control two-way reversing valve, load holding module and load holding system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200306 Effective date of abandoning: 20240528 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200306 Effective date of abandoning: 20240528 |