CN203772245U - Displacement test equipment for valve core of hydraulic valve - Google Patents
Displacement test equipment for valve core of hydraulic valve Download PDFInfo
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- CN203772245U CN203772245U CN201420100964.9U CN201420100964U CN203772245U CN 203772245 U CN203772245 U CN 203772245U CN 201420100964 U CN201420100964 U CN 201420100964U CN 203772245 U CN203772245 U CN 203772245U
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- hydraulic valve
- head rod
- valve spool
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 130
- 238000012360 testing method Methods 0.000 title abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 34
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 27
- 230000000694 effects Effects 0.000 claims description 17
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 abstract description 9
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 210000002445 nipple Anatomy 0.000 description 22
- 239000000523 sample Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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Abstract
The utility model discloses a displacement test equipment of hydrovalve case, including displacement conduction device (2), this displacement conduction device (2) include base (21) and head rod (22), and base (21) vacuum adsorption is on hydrovalve case (3), and first end (221) of head rod (22) are fixed on base (21), and second end (222) are connected with displacement sensor (4), in order realize when hydrovalve case (3) remove the displacement measurement of hydrovalve case (3). In this way, the utility model discloses can avoid the damage to hydrovalve case, and can not pollute hydraulic oil, can improve measuring accuracy simultaneously.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of displacement measurement equipment of hydraulic valve spool.
Background technology
In the type approval test of hydraulic multichannel operation valve, fretting performance test is and one of important test.Fretting performance test is mainly to investigate in the slow moving process of banked direction control valves with spool, corresponding pressure or the relation between flow and the displacement of spool.Therefore, realize fretting performance test, be first to want to test the displacement of hydraulic valve spool.And in test process, hydraulic valve spool need to be placed in guide's housing that hydraulic oil is housed, the displacement transducer can not work under pressure oil environment if adopt, need by the displacement of hydraulic valve spool be guided out after guide's housing can connection bit displacement sensor to carry out fretting performance test.
As shown in Figure 1, in the displacement measurement of hydraulic valve spool, testing apparatus generally comprises the support 104 of leading-off rods 101, connecting link 102, displacement transducer 103 and bracing displacement sensor 103.Hydraulic valve spool 105 is placed in guide's housing 106, and guide's housing 106 is provided with oil inlet and outlet 1061 and through hole 1062.One end of leading-off rods 101 is fixed on hydraulic valve spool 105, the other end passes guide's housing 106 by the through hole 1062 of guide's housing 106, and be connected with displacement transducer 103 by connecting link 102, displacement transducer 103 is fixed on stand 107 by support 104.Thereby when hydraulic valve spool 105 back and forth movement, drive leading-off rods 101 back and forth movements, and then by leading-off rods 101, the displacement of hydraulic valve spool 105 is conducted to displacement transducer 103, displacement transducer 103 just can obtain the displacement curve of hydraulic valve spool 105 by signals collecting.According to displacement curve and the pressure or the flow curve that obtain from pressure and flow sensor, just can access the fine motion family curve of the hydraulic valve spool displacement that pressure or flow are corresponding afterwards, thereby the fretting performance of realizing hydraulic valve spool is tested.In addition, through hole 1062 places at guide's housing 106, are also provided with O-ring seal 1063, leak preventing in process that hydraulic oil moves at leading-off rods 101 from through hole 1062.
In aforesaid way, leading-off rods 101 is generally that the mode being threaded connection is fixed on hydraulic valve spool, or by modes such as gluing, welding, magnet adsorptions, leading-off rods 101 and hydraulic valve spool 105 is fixing.Yet, adopt the mode of gluing, its gluing thing easily produces and pollutes hydraulic oil, welding and the mode being threaded can have damage to hydraulic valve spool 105, adopt the mode of magnet adsorption because magnet exists magnetic field, easily to displacement transducer 103, cause signal to disturb, thereby cause the test data of displacement transducer 103 inaccurate.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of displacement measurement equipment of hydraulic valve spool, can avoid the damage to hydraulic valve spool, and can contaminating fluid force feed, can improve the accuracy of measurement simultaneously.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of displacement measurement equipment of hydraulic valve spool is provided, comprises: displacement conduction device and displacement measuring device, and described displacement conduction device comprises pedestal and head rod; Described base vacuum is adsorbed on described hydraulic valve spool, the first end of described head rod is fixed on described pedestal, the second end of described head rod is connected with described displacement measuring device, to realize the displacement measurement of described hydraulic valve spool when described hydraulic valve spool moves.
Wherein, described pedestal comprises vacuum cup, and described vacuum cup is adsorbed on described hydraulic valve spool, and is provided with connecting hole in a side of described hydraulic valve spool dorsad; The first end of described head rod and described connecting hole are suitable, while inserting described connecting hole with the first end at described head rod, the first end of described head rod are fixed in described connecting hole.
Wherein, described pedestal comprises the first check valve assembly, described the first check valve assembly at least comprises the first inner elements of check valve, in described vacuum cup, be provided with air duct, the air intake opening of described air duct is communicated with the space between described vacuum cup and described hydraulic valve spool, the gas outlet of described air duct is communicated with described connecting hole, described the first inner elements of check valve is arranged in described air duct, so that the air one-way flow direction of described air duct is from described air intake opening to described gas outlet; The inside of described head rod is hollow cavity, in the time of in the first end of described head rod is fixed on described connecting hole described in hollow cavity be communicated with the gas outlet of described air duct; In described hollow cavity, be provided with the piston body of axial activity, so that the gas between described vacuum cup and described hydraulic valve spool is sucked the described hollow cavity between described piston body and the first end of described head rod from described air duct.
Wherein, described the first check valve assembly comprises the first O-ring seal, the first elastic component and cover plate, and described cover plate is provided with the first pilot hole and at least one first through hole; Described cover plate is plugged in the gas outlet of described air duct, described the first inner elements of check valve is between described cover plate and the air intake opening of described air duct, and one end end face of described the first inner elements of check valve is provided with the first teat, described the first teat penetrates the first pilot hole of described cover plate, the other end end face of described the first inner elements of check valve is provided with the second teat, and the described air duct internal diameter at described the second teat place and described the second teat external diameter are adaptive; Described the first elastic component elasticity is resisted against between one end end face and described cover plate that described the first inner elements of check valve is provided with the first teat, and described the first O-ring seal is arranged between one end end face and the conduit wall of described air duct of described the second teat of being provided with of described the first inner elements of check valve.
Wherein, described vacuum cup is provided with second through hole separate with described air duct, described pedestal also comprises seal assembly, and described seal assembly is arranged at described the second through hole end opening of described hydraulic valve spool dorsad, to seal described the second through hole.
Wherein, described piston body is provided with the 3rd through hole, described head rod comprises the second check valve assembly, described the second check valve assembly comprises threaded rod, nut and the second elastic component, described threaded rod runs through described the 3rd through hole from a side of the second end of the close described head rod of described piston body, described nut is fixed on the afterbody that described threaded rod passes described the 3rd through hole, and described the second elastic component is arranged between described nut and described piston body.
Wherein, described vacuum cup comprises the first housing and flexible the second housing, and described the second housing is attached on described hydraulic valve spool, and described the first housing is overlapped on described the second housing; Wherein, described a first housing dorsad side of described the second housing is provided with described connecting hole, wherein, described connecting hole is through hole, the first end of described head rod inserts described connecting hole to push described the second housing, and then the gas between described the second housing and described hydraulic valve spool is discharged.
Wherein, described displacement measurement equipment also comprises: cover body and bracing or strutting arrangement, and described bracing or strutting arrangement is fixed on described cover body, and described displacement measuring device is installed on described bracing or strutting arrangement; Described cover body is located on hydraulic valve body, so that described hydraulic valve spool is arranged in the confined space that described cover body and described hydraulic valve body form; Described cover body is provided with through hole, and the second end of described head rod passes described through hole to be connected with described displacement measuring device.
Wherein, described bracing or strutting arrangement comprise support bar, for relatively described support bar height adjustable fix bracing frame and first fixture of described displacement measuring device, described support bar is fixed on described cover body; On the length direction of described support bar, be provided with at least one the 4th through hole, on support frame as described above, be provided with the 5th through hole, described the first fixture runs through described the 4th through hole and described the 5th through hole successively, support frame as described above is fixed on alternatively to the diverse location on the length direction of described support bar.
Wherein, described support bar is the rectangular parallelepiped support bar that length direction is parallel to described head rod, and described bracing or strutting arrangement comprises the square body slide block that can slide on described support bar along the length direction of described support bar; One side of described side's body slide block is vertical with the axis of described support bar, and is close to support frame as described above, so that support frame as described above is vertically set on described support bar along the short transverse of described support bar.
Wherein, described the 5th through hole is greater than the portion of running through that described the first fixture runs through described the 5th through hole along the aperture in the short transverse of described support bar, so that described the first fixture runs through the diverse location of described the 5th through hole in the short transverse of described support bar alternatively, and then support frame as described above height is fixed on described support bar adjustablely.
The beneficial effects of the utility model are: the situation that is different from prior art, in the displacement measurement equipment of the utility model hydraulic valve spool, comprise displacement conduction device, this displacement conduction device comprises pedestal and head rod, base vacuum is adsorbed on hydraulic valve spool, the first end of head rod is fixed on pedestal, the second end is connected with displacement transducer, thereby head rod also moves along with the movement of hydraulic valve spool when hydraulic valve spool moves, and then the displacement of hydraulic valve spool is conducted in displacement transducer, to realize the displacement measurement of hydraulic valve spool by displacement transducer, and base vacuum is adsorbed on hydraulic valve spool, compared to being spirally connected of prior art, the modes such as welding, can not cause damage to hydraulic valve spool, and compared to existing magnet adsorption mode, the utility model can not cause signal to disturb to displacement transducer, can improve the accuracy of test figure.
Accompanying drawing explanation
Fig. 1 is the displacement measuring equipment of a kind of hydraulic valve spool in prior art;
Fig. 2 is that the master of displacement measurement equipment one embodiment of the utility model hydraulic valve spool looks schematic diagram;
Fig. 3 is the structure for amplifying schematic diagram of the displacement conduction device in Fig. 2, and wherein, head rod only illustrates part-structure;
Fig. 4 is the structure for amplifying schematic diagram of the head rod in Fig. 2;
Fig. 5 is the second check valve assembly in Fig. 2 and the structure for amplifying schematic diagram of part piston body;
Fig. 6 is the structure for amplifying schematic diagram of part cover body and head rod in Fig. 2;
Fig. 7 is bracing or strutting arrangement in Fig. 2 and the structure for amplifying schematic diagram of displacement transducer;
Fig. 8 is that the displacement measurement equipment of hydraulic valve spool of Fig. 2 is along the vertical view of CD direction;
Fig. 9 is in another embodiment of displacement measurement equipment of the utility model hydraulic valve spool, the structure for amplifying schematic diagram of displacement conduction device.
Embodiment
Below in conjunction with drawings and embodiments, the utility model is elaborated.
Consult Fig. 2, in an embodiment of the displacement measurement equipment of the utility model hydraulic valve spool, comprise displacement conduction device 2 and displacement measuring device 4a.In present embodiment, displacement measuring device 4a is displacement transducer 4, certainly, can be also other displacement measuring devices such as displacement measuring instrument in other embodiments.Displacement conduction device 2 comprises pedestal 21 and head rod 22.Wherein, pedestal 21 vacuum suction are on hydraulic valve spool 3, and the first end 221 of head rod 22 is fixed on pedestal 21, and the second end 222 of head rod 22 is connected with the probe 4 of displacement transducer 4.Thereby when hydraulic valve spool 3 moves, head rod 22 also moves along with the movement of hydraulic valve spool 3, thereby the displacement of hydraulic valve spool 3 is conducted to displacement transducer 4, displacement transducer 4 obtains the displacement curve of hydraulic valve spool 3 by signals collecting, thereby realizes the displacement measurement of hydraulic valve spool 3.
In present embodiment, pedestal 21 is that vacuum is connected with the connected mode of hydraulic valve spool 3, be that pedestal 21 is for vacuum suction is on hydraulic valve spool 3, thereby can avoid the damage to hydraulic valve spool 3, can reduce the impact on displacement transducer 4, improve the measurement accuracy of displacement transducer 4 simultaneously.
In the utility model one preferred implementation, consult Fig. 3, pedestal 21 comprises vacuum cup 211 and the first check valve assembly.Wherein, the first check valve assembly comprises the first inner elements of check valve 212, the first O-ring seal 213, the first elastic component 214 and cover plate 215.
The one side of vacuum cup 211 is adsorbed on hydraulic valve spool 3, and the position contacting with hydraulic valve spool 3 at vacuum cup 211 establishes sealing gasket 2111, vacuum cup 211 dorsad a side of hydraulic valve spool 3 be provided with connecting hole 1a, for connecting head rod 22.Wherein, the connecting hole 1a of present embodiment is threaded hole.First end 221 outside surfaces of head rod 22 are provided with the screw thread suitable with connecting hole 1a, thereby by the screw thread on first end 221 outsides, the first end of head rod 22 221 are fixed in connecting hole 1a.In other embodiments, head rod 22 can be also to fix with connecting hole 1a by other means, for example, can on the hole wall of connecting hole 1a, groove be set, and the projection suitable with this groove be set on the first end 221 of head rod 22, thereby when the first end of head rod 22 221 is inserted to connecting hole 1a, by the fastening effect of the projection on the first end 221 of head rod 22 and the groove on connecting hole 1a, the first end of head rod 22 221 is fixed in connecting hole 1a.
Vacuum cup 211 is provided with air duct 2a, and air duct 2a comprises air intake opening 2a1 and gas outlet 2a2, and air intake opening 2a1 is communicated with the space between vacuum cup 211 and hydraulic valve spool 3, and gas outlet 2a2 is communicated with connecting hole 1a.Wherein, air duct 2a is three grades of stepped air ducts, and the opening from air intake opening 2a1 to gas outlet 2a2 increases step by step, and one section of passage of minimal openings is as air intake opening 2a1, and one section of passage of maximum open is as gas outlet 2a2.The first inner elements of check valve 212 is arranged in three grades of stepped air duct 2a, and be the position that is arranged in the larger opening in centre of air duct 2a, so that the air one-way flow direction of air duct 2a is from air intake opening 2a1 to gas outlet 2a2, by the effect of the first inner elements of check valve 212, make the air in air duct 2a to flow to gas outlet 2a2 from air intake opening 2a1, and can not flow to air intake opening 2a1 from gas outlet 2a2.
The inside of head rod 22 is hollow cavity 3a, and in the time of in the first end 221 of head rod 22 is fixed on connecting hole 1a, hollow cavity 3a is communicated with the gas outlet 2a2 of air duct 2a.In addition, be provided with the piston body 23 of axial activity in hollow cavity 3a, the piston crown of piston body 23 is close to the chamber wall of hollow cavity 3a, and the pull bar of piston body 23 extends hollow cavity 3a.By pulling the pull bar of piston body 23 to pull the piston crown of piston body 23, and then the gas between vacuum cup 211 and hydraulic valve spool 3 is sucked the hollow cavity 3a between piston body 23 and the first paragraph 221 of head rod 22 from air duct 2a.The cover plate 215 of the first check valve assembly is arranged on the 2a2 place, gas outlet of air duct 2a, with the gas outlet 2a2 of shutoff air duct 2a, and is provided with O-ring seal 2153 between cover plate 215 and the conduit wall of air duct 2a.On cover plate 215, offer the first pilot hole 2151 and 2152, two the first through holes 2152 of two the first through holes for being communicated with the air duct 2a at the first inner elements of check valve 212 places.The first inner elements of check valve 212 is between cover plate 215 and the air intake opening 2a1 of air duct 2a, by cover plate 215 and stepped air duct 2a, to realize, the first inner elements of check valve 212 is carried out to guide-localization, be specially, one end end face of the first inner elements of check valve 212 is provided with the first teat 2121, and the first teat 2121 penetrates the first pilot hole 2151 of cover plate 215, the other end end face of the first inner elements of check valve 212 is provided with the second teat 2122, the internal diameter of the air duct 2a at the external diameter of the second teat 2122 and the second teat 2122 places is adaptive, the second teat 2122 is positioned at the air intake opening 2a1 place of air duct 2a.By two teats 2121 of the first inner elements of check valve 212 and 2122 guide effect, so that the first position of inner elements of check valve 212 in air duct 2a can not be offset.The first elastic component 214 is resisted against between one end end face and cover plate 215 that the first inner elements of check valve 212 is provided with the first teat 2121, and the first O-ring seal 213 is arranged between one end end face that is provided with the second teat 2122 and the conduit wall of air duct 2a of the first inner elements of check valve 212.Wherein, the first elastic component 214 can be spring or shell fragment etc.The first elastic component 214 is the compressive state in being pushed by the first inner elements of check valve 212 all the time, thereby the elastic force that the first elastic component 214 produces to BA direction the first inner elements of check valve 212 all the time, and then under the elastic force effect of the first elastic component 214, make one end end face that is provided with the second teat 2122 of the first inner elements of check valve 212 tightly push down air passage wall, tightly to block the air intake opening 2a1 of air duct 2a, to prevent that air from finally entering between vacuum cup 211 and hydraulic valve spool 3 through air intake opening 2a1 from gas outlet 2a2.And, by the first O-ring seal 213 being set between one end end face that is provided with the second teat 2122 at the first inner elements of check valve 212 and air passage wall, can further prevent that air from entering between vacuum cup 211 and hydraulic valve spool 3 through air intake opening 2a1.
Before carrying out the displacement measurement of hydraulic valve spool 3, first displacement conduction device 2 is connected with hydraulic valve spool 3.Now, the connecting hole 1a that can first head rod 22 be screwed on vacuum cup 211, so that head rod 22 is fixed on pedestal 21, now the hollow cavity 3a in head rod 22 is communicated with the air duct 2a on vacuum cup 211.Then vacuum cup 211 is attached on hydraulic valve spool 3, and pull the piston body 23 in head rod 22 to move toward AB direction, under the effect of piston body 23, make gas pressure intensity between vacuum cup 211 and hydraulic valve spool 3 be greater than the pressure at the air duct 2a place at the first inner elements of check valve 212 places.More specifically, under the effect of piston body 23, when the air pressure at air intake opening 2a1 place is greater than the elastic force of 214 pairs of the first inner elements of check valves 212 of the first elastic component to the air pressure at the acting force of the first inner elements of check valve 212 and 2a2 place, gas outlet to the difference of the acting force of the first inner elements of check valve 212, while being the air pressure at the air intake opening 2a1 place air pressure that the acting force of the first inner elements of check valve 212 is greater than to 2a2 place, gas outlet to the summation of the elastic force of the acting force of the first inner elements of check valve 212 and 214 pairs of the first inner elements of check valves 212 of the first elastic component, under the gaseous tension effect at air intake opening 2a1 place, make the first inner elements of check valve 212 move to AB direction, and then make being provided with between second teat 2122 one end end faces and the air duct 2a at the second teat 2122 places of the first inner elements of check valve 212 have gap, the first inner elements of check valve 212 is opened, make thus the gas between vacuum cup 211 and hydraulic valve spool 3 by this gap, enter in the air duct 2a at the first inner elements of check valve 212 places, and enter in the hollow cavity 3a of head rod 22 by two the first through holes 2152 on cover plate 215.When constantly piston body 23 being pulled toward AB direction, gas between vacuum cup 211 and hydraulic valve spool 3 is constantly inhaled in the hollow cavity 231 between piston body 23 and the first end 221 of head rod 22, make thus to form vacuum cavity between vacuum cup 211 and hydraulic valve spool 3, its air pressure is less than external atmosphere pressure, can make thus vacuum cup 211 be close to hydraulic valve spool 3, thereby realize, vacuum cup 211 is fixed on hydraulic valve spool 3.
Between vacuum cup 211 and hydraulic valve spool 3, form after vacuum cavity, the air pressure of the vacuum cavity between vacuum cup 211 and hydraulic valve spool 3 is less than the air pressure of the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22, simultaneously under the effect of the first elastic component 214, the air duct 2a that is provided with second teat 2122 one end end faces and the second teat 2122 places of the first inner elements of check valve 212 can tightly be fitted again, to block the air intake opening 2a1 of air duct 2a, can avoid thus the air in hollow cavity 3a to enter in this vacuum cavity.In addition, in order effectively to prevent that atmosphere from entering in the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22, end face at the first end 221 of head rod 22 is provided with O-ring seal 223, between the piston crown of piston body 23 and the cavity wall of hollow cavity 3a, is provided with O-ring seal 231.O-ring seal 2153,223,231 is all for further preventing that ambient atmosphere from entering hollow cavity 3a, to improve the vacuum capability of piston body 231.
In another preferred implementation of the present utility model, in order to facilitate the dismounting of vacuum cup 211, on vacuum cup 211, be also provided with second through hole 2112 separate with air duct 2a.Pedestal 21 also comprises the seal assembly of an end opening of the spool of hydraulic valve dorsad 3 that is arranged at the second through hole 2112, to seal the second through hole 2112.Wherein, the second through hole 2112 is threaded hole, seal assembly comprises the bolt 216 suitable with the second through hole 2112, the screw rod of bolt 216 from the second through hole 2112 dorsad an end opening of hydraulic valve spool 3 penetrate in the second through hole 2112, and the head of bolt 216 is greater than the second through hole, while penetrating the second through hole 2112 with the screw rod at bolt 216, seal the second through hole 2112.When vacuum cup 211 is fixed on hydraulic valve spool 3, bolt 216 sealing the second through holes 2112, to avoid air to enter between vacuum cup 211 and hydraulic valve spool 3 from the second through hole 2112.In addition, between the head of bolt 216 and the second through hole 2112 external margins, be provided with O-ring seal 2161, further to prevent that gas enters between vacuum cup 211 and hydraulic valve spool 3 in the process vacuumizing.Because vacuum cup 211 is to rely on the draught head between vacuum cavity and the external world and be tightly attached on hydraulic valve spool 3, therefore when needs are dismantled vacuum cup 211, only bolt 216 need be unclamped, make gas from the second through hole 2112, enter between vacuum cup 211 and hydraulic valve spool 3, the pressure reduction of vacuum cup 211 both sides disappears, vacuum cup 211 can come off from hydraulic valve spool 3, can be by vacuum cup 211 dismountings.
In another preferred implementation of the present utility model, consult Fig. 4, head rod 22 comprises the second check valve assembly 24.The second check valve assembly 24 is arranged on the piston crown of piston body 23, and the direction that the second check valve assembly 24 limits air one-way flows is that the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22 flows in the cavity between the second end 222 of piston body 23 and head rod 22.Effect by the second check valve assembly 24 can make piston body 23 have vacuum capability repeatedly, can make piston body 23 in hollow cavity 3a, to move reciprocatingly, repeatedly the vacuum cavity between vacuum cup 211 and hydraulic valve spool 3 is vacuumized, further to improve the reliability being connected between vacuum cup 211 and hydraulic valve spool 3.
Particularly, in conjunction with Fig. 5, on the piston crown of piston body 23, be provided with the 3rd through hole 232.The second check valve assembly 24 comprises threaded rod 241, nut 242 and the second elastic component 243.Threaded rod 241 runs through the 3rd through hole 232 from piston body 23 near the second end 222 1 sides of head rod 22, and nut 242 is fixed on the afterbody that threaded rod 241 passes the 3rd through hole 232, and the head of threaded rod 241 is greater than the 3rd through hole 232.The second elastic component 243 is arranged between nut 242 and piston body 23, and, between threaded rod 241 and the hole wall of the 3rd through hole 232, there is certain gap.By rotating nut 242, make the second elastic component 243 in compressive state, thereby nut 242 is produced to elastic force, under this elastic force effect, make the head of threaded rod 241 be close to the piston crown of piston body 23, with shutoff the 3rd through hole 232, prevent that air from entering the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22 from the 3rd through hole 232.Between the head of threaded rod 241 and piston body 23, be provided with O-ring seal 244, further to prevent that air from entering in the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22.
When piston body 23 need to vacuumize the vacuum cavity between vacuum cup 211 and hydraulic valve spool 3 repeatedly, piston body 23 need be promoted toward BA direction, now can be to the gas compression in the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22, the air pressure of this hollow cavity 23 is increased gradually, thereby the pressure of double thread bar 241 is also in continuous increase, when the pressure of the gas pressure intensity double thread bar 241 in this hollow cavity 23 is greater than the elastic force to nut 242 of the second elastic component 243, threaded rod 241 is moved along AB direction, thereby the head that makes threaded rod 241 is no longer close to the piston crown of piston body 23, but and between the piston crown of piston body 23, there is certain gap, can make thus the gas in the hollow cavity 3a between piston body 23 and the first end 221 of head rod 22 flow out from the 3rd through hole 232, and then make piston body 23 can continue to promote toward BA direction, after being pushed to certain position, pull again piston body 23 to move again the vacuum cavity between vacuum cup 211 and hydraulic valve spool 3 is vacuumized along AB direction.Wherein, the second elastic component 243 can be spring, or is provided with the shell fragment of through hole, or is semicircle shell fragment etc., thereby makes the second elastic component 243 can shutoff the 3rd through hole 232.
In another preferred implementation of the present utility model, displacement measurement equipment also comprises that one end of the second connecting link 8, the second connecting links 8 and the second end 222 of head rod 22 are connected, and the other end of the second connecting link 8 is connected with the probe 41 of displacement transducer 4.
In another preferred implementation of the present utility model, continue to consult Fig. 2, the displacement measurement equipment of present embodiment also comprises cover body 5 and bracing or strutting arrangement 6.Bracing or strutting arrangement 6 is fixed on cover body 5, and displacement transducer 4 is installed on bracing or strutting arrangement 6.
Wherein, cover body 5 is located on hydraulic valve body 7, so that hydraulic valve spool 3 is arranged in the confined space that cover body 5 and hydraulic valve body 7 form.Cover body 5 is for carrying out the fretting performance test of hydraulic valve spool 3, the container of splendid attire hydraulic oil, and it is provided with the import and export 51 of hydraulic oil.In conjunction with Fig. 6, on cover body 5, be also provided with through hole 52, the second end 222 of head rod 22 passes through hole 52 and is connected with the probe 41 with displacement transducer 4.Further, crooked for fear of occurring when head rod 22 being passed to the through hole 52 of cover body 5, keep head rod 22 quality of balance, on through hole 52, be provided with the screw plug 521 of guide effect, screw plug 53 is threadedly connected in through hole 52 with shutoff through hole 52, and in screw plug 53, be provided with the second pilot hole 531, the second pilot hole 531 with the connecting hole 1a for fixing head rod 22 at same straight line, thereby when head rod 22 is drawn by the second pilot hole 531 on screw plug 53, can guarantee that head rod 22 does not occur crooked.In addition, between the hole wall of the second pilot hole 531 of head rod 22 and screw plug 53, be provided with O-ring seal 54, to prevent that the hydraulic oil in cover body 5 from flowing out from screw plug 53.And, between the hole wall of the through hole 52 on screw plug 53 and cover body 5, be provided with O-ring seal 55, to prevent that the hydraulic oil in cover body 5 from flowing out from through hole 52.
In conjunction with Fig. 7, bracing or strutting arrangement 6 comprises support bar 61 and for the relative bracing frame 62 of the adjustable map position displacement sensor 4 of height of support bar 61.The length direction of support bar 61 is parallel to head rod 22, and is fixed on cover body 5, and the modes such as it can be by being spirally connected, welding and cover body 5 are fixing.In present embodiment, for the ease of the installation and removal of support bar 61, by a bracket base 63, support bar 61 is fixing.Particularly, bracket base 63 also can be by being spirally connected or the mode such as welding is fixed on cover body 5, on bracket base 63, be provided with threaded hole, and in order to keep the level of support bar 61, the threaded hole of two horizontal distribution is set on bracket base 63, and on support bar 61 also two threaded holes of relative set.When support bar 61 is installed, the corresponding setting of two threaded holes by two threaded holes of support bar 61 with bracket base 63, and by bolt 631, support bar 61 is fixed on bracket base 63.
Bracing frame 62 is fixed on the diverse location of support bar 61 alternatively.Particularly, bracing or strutting arrangement 6 also comprises the first fixture 64, for bracing frame 62 is fixed on to support bar 61.Wherein, the first fixture 64 comprises screw bolt and nut.The 4th through hole 611, the four through holes 611 that are provided with a plurality of arrangements of the length directions along support bar 61 on support bar 61 are suitable with bolt, are provided with the 5th through hole 621 on bracing frame 62.The bolt of the first fixture 64 runs through the 4th through hole 611 on support bar 61 and the 5th through hole 621 on bracing frame 62 simultaneously, and the nut of the first fixture 64 is fixed on the afterbody that bolt passes the 5th through hole 621, thereby bracing frame 62 is fixed on support bar 61.Owing to being provided with a plurality of the 4th through holes on support bar 61, therefore can be by selecting the 4th different through holes 611 bracing frame 62 to be fixed on to the diverse location of support bar 61, thereby make the position of bracing frame 62 on support bar 61 adjustable, and then moving displacement sensor 4 on the length direction of support bar 61 as required.Certainly, in other embodiments, bracing frame 62 also can be fixed on support bar 61 with other fixed forms such as buckles.In addition, also can be that the 4th through hole 611 is only set on support bar 61, make the 4th aperture of through hole 611 on the length direction of support bar 61 be greater than the first fixture 64 bolt-through the 4th through hole 611 run through part, for example can make the 4th aperture of through hole 611 on the length direction of support bar 61 is that half length of support bar 61 is even longer, so that the bolt of the first fixture 64 runs through the diverse location of the 4th through hole 611 alternatively, thereby bracing frame 62 is fixed on alternatively to the diverse location of support bar 61.
In another preferred implementation of the present utility model, the highly adjustable map position displacement sensor 4 of the relative support bar 61 of bracing frame 62, the Partial Height for fixed displacement sensor 4 that specifically refers to bracing frame 62 is adjustable, and between displacement transducer 4 and support bar 61, the distance of in the vertical direction is adjustable like this.Particularly, the 5th through hole 621 on bracing frame 62 is greater than the portion of running through of bolt-through the 5th through hole 621 of the first fixture 64 along the aperture in the short transverse of support bar 61.Wherein, with the view shown in Fig. 2, be as the criterion, the length direction of support bar 61 is x direction of principal axis, and the short transverse of described support bar 61 is the y direction of principal axis of the length direction of vertical support bar.The 5th through hole 621 for example can be slot or oval hole.The bolt of the first fixture 64 run through alternatively the 5th through hole 621 along the diverse location in the short transverse of support bar 61, thereby it is highly adjustable with respect to support bar 61 to realize the part for fixed displacement sensor 4 of bracing frame 62.Therefore,, by adjusting the height of the part for fixed displacement sensor 4 of bracing frame 62, can regulate displacement transducer 4 with respect to the height of support bar 61.When the probe 41 of displacement transducer 4 is during with head rod 22 disalignment, bracing frame 62 can be moved the short transverse along support bar 61, when moving to correct position by the bolt-through of the first fixture 64 the 5th through hole 621 position corresponding to the 4th through hole 611, so that bracing frame 62 is fixed on support bar 61.By the way, can with respect to the height of support bar 61, adjust displacement transducer 4, thereby can be so that the probe of displacement transducer 4 and head rod 22 are positioned at sustained height, and then can guarantee the right alignment of probe 41 with the head rod 22 of displacement transducer 4.
In another preferred implementation of the present utility model, support bar 61 is parallel to the rectangular parallelepiped support bar of head rod 22 for length direction.Bracing frame 62 can be located on support bar 61.In order to guarantee the vertical of bracing frame 62 and support bar 61, and prevent when bracing frame 62 is installed bracing frame 62 from occurring crooked and cause the probe 41 and head rod 22 disalignments of displacement transducer 4, bracing or strutting arrangement 6 also comprises square body slide block 65 and second fixture 66 that can slide on support bar 61 along the length direction of support bar 61.Wherein the second fixture 66 is bolt, for square body slide block 65 is fixed on to support bar 61.
Body slide block 65 inside, side are provided with T shape through hole, on three faces of square body slide block 65, are equipped with perforate.Side's body slide block 65 through holes by the horizontal component corresponding to T shape slide on support bar 61, i.e. the through hole of support bar 61 side's of running through body slide block 65 horizontal components corresponding to T shape, so that square body slide block 65 is slidably on support bar 61.In the through hole of the second 66 of the fixtures side of penetrating body slide block 65 vertical components corresponding to T shape, this through hole corresponding to the vertical component of T shape is threaded hole, the second fixture 66 is the bolt suitable with this threaded hole, by in the through hole of the vertical component corresponding to T shape of second fixture 66 side's of being screwed into body slide blocks 65, so that square body slide block 65 is fixed on support bar 61.Wherein, the shape of the through hole of side's body slide block 65 horizontal components corresponding to T shape is identical with the shape of support bar 61, the inside surface of the through hole of the horizontal component of the T shape of the side's of being body slide block 65 is also cuboid, thereby the interior upper surface of the through hole of the horizontal component of the T shape of the side's of making body slide block 65 is close to the upper surface on the length direction of support bar 61.In addition, the relative two sides that are equipped with perforate of side's body slide block 65 are mutually vertical with the interior upper surface of the through hole of the horizontal component of this T shape, thereby the upper surface on the length direction of the relative two sides vertical support bar 61 that is provided with perforate of the side's of making body slide block 65, thereby the axis on the length direction of the relative two sides that are equipped with perforate of the side's of making body slide block 65 and support bar 61 is vertical.And the side 622 of bracing frame 62 is close in the side in the relative two sides that are provided with perforate of square body slide block 65, thereby can make the side 622 and the parallel sided of being close to its square body slide block 65 of bracing frame 62, and then make the axis on the side 622 of bracing frame 62 and the length direction of support bar 61 vertical, can make thus bracing frame 62 be vertically set on support bar 61 along the short transverse of support bar 61, and then can prevent that bracing frame 62 from tilting, to guarantee the right alignment of probe 41 with the head rod 22 of displacement transducer 4, and install as datum clamp face the side that also can take when mounted in the relative two sides that are provided with perforate of square body slide block 65, can improve the installation accuracy of bracing frame 62.Certainly, in other embodiments, the second fixture 66 can be also other fixed sturctures such as buckle.
In another preferred implementation of the present utility model, consult Fig. 8, bracing or strutting arrangement 6 also comprises the 3rd fixture 67 and the 4th fixture 68.The 3rd fixture 67 and the 4th fixture 68 are arranged on bracing frame 62, and support respectively the dual-side that displacement transducer 4 is relative, so that displacement transducer 4 is fixed on bracing frame 62.Effect by bracing or strutting arrangement 6 not only can realize displacement transducer 4 is moved left and right along the length direction of support bar 61, but also can make displacement transducer 4 move forward and backward along the horizontal direction perpendicular to support bar 61.For the ease of understanding, in conjunction with Fig. 2, described above moving left and right refers to moving left and right on the identical x direction of principal axis of the length direction with support bar 61, and move forward and backward, refer to moving forward and backward on the z direction of principal axis perpendicular to x axle y axle place plane, in Fig. 2, move forward and backward and refer to moving forward and backward perpendicular to the direction of paper.Wherein, above-mentioned moving left and right, move forward and backward is all the views with shown in Fig. 2, can be also other description in other views.
Particularly, bracing frame 62 is provided with relative two installed surfaces 623,624 for the part of fixed displacement sensor 4, and two installed surfaces the 623, the 624th, on z direction of principal axis (being the z direction of principal axis shown in Fig. 2), is oppositely arranged.The 3rd fixture 67 and the 4th fixture 68 are bolt, and the 3rd fixture 67 and the 4th fixture 68 are oppositely arranged on support 62.Further, two installed surfaces 623,624 at bracing frame 62 are respectively arranged with the screw suitable with bolt, one side of the 3rd fixture 67 self-supporting frame 62 outsides runs through the screw in installed surface 623, one side of the 4th fixture 68 self-supporting frame 62 outsides is inserted the screw in installed surface 624, thereby the 3rd fixture 67 and the 4th fixture 68 can not dropped from bracing frame 62.
Displacement transducer 4 is between the 3rd fixture 67 and the 4th fixture 68, and the 3rd fixture 67 supports respectively with the 4th fixture 68 dual-side that displacement transducer 4 is relative.By tightening the 3rd fixture 67 and the 4th fixture 68, make the 3rd fixture 67 and the 4th fixture 68 be close to respectively the dual-side of displacement transducer 4, thereby displacement transducer 4 is fixed on bracing frame 62.When needing the position of adjusted position displacement sensor 4 so that the probe 41 of displacement transducer 4 when coaxial with head rod 22, for example, the EF direction shown in Fig. 8 (identical with the negative direction of the z axle shown in Fig. 2) of take is example explanation, displacement transducer 4 need be moved along EF direction, now the 3rd fixture 67 can be screwed out along EF direction, and displacement transducer 4 is moved along EF direction, when moving to suitable position, make the 3rd fixture 67 and the 4th fixture 68 support displacement transducer 4, so that displacement transducer 4 is fixing.
By above-mentioned embodiment, be used in pedestal 21 vacuum suction of fixing head rod 22 in hydraulic valve spool 3, compared to being existingly spirally connected, the mode such as welding can avoid the damage to hydraulic valve spool 3, and can hydraulic oil not produced and be polluted, can not cause signal to disturb to displacement transducer 4 yet.And the bracing or strutting arrangement for bracing displacement sensor 46 is fixed on to cover body 5, can save the space of stand, and, when test multi-path hydraulic valve, the spool of multi-path hydraulic valve is more, by bracing or strutting arrangement 6 and cover body 5 are integrated, after testing a hydraulic valve spool, do not need to dismantle bracing or strutting arrangement 6, and only need cover body 5 to pull down and be installed on another hydraulic valve, compared to dismounting and fittable slackening device 6, can save the time removing and installing, more convenient use.In addition, by the screw plug 53 of guide effect is set on cover body 5, can guarantee the balance of head rod 22 when drawing cover body 5, and by the effect of bracing or strutting arrangement 6, make displacement transducer 4 adjustable with respect to the position of support bar 61, highly adjustable with respect to support bar 61, can be conducive to the coaxial of the probe 41 of adjusted position displacement sensor 4 and head rod 22.
In another embodiment of the displacement measurement equipment of the utility model hydraulic valve spool, can also base vacuum be adsorbed on hydraulic valve spool by another kind of mode.Consult Fig. 9, in present embodiment, vacuum cup 211 comprises that the first housing 91 and flexible the second housing 92, the second housings 92 can be used sealing soft material to make, and the first housing 91 can be the plastic casing of hard material.The second housing 92 is attached on hydraulic valve spool 3, and the first housing 91 is overlapped on the second housing 92.Wherein, a first housing 91 dorsad side of hydraulic valve spool 3 is provided with for the fixing connecting hole 1a of head rod 22, and its connecting hole 1a is through hole.The first end 221 of head rod 22 is suitable with connecting hole 1a, while inserting connecting hole 1a with the first end 221 at head rod 22, head rod 22 is fixed in connecting hole 1a.Wherein, connecting hole 1a can be threaded hole, and at the outside surface setting of the first end 221 of head rod 22 and the suitable screw thread of connecting hole 1a.In the time of in head rod 22 is inserted to connecting hole 1a, along with head rod 22 constantly screws in connecting hole 1a, first end 221 contact second housings 92 of head rod 22, and push the second housing 92, so that the air scavenge between the second housing 92 and hydraulic valve spool 3, thereby make the air pressure between the second housing 92 and hydraulic valve spool 3 be less than ambient pressure, and then the second housing 92 is tightly adsorbed on hydraulic valve spool 3, realize thus vacuum cup 211 is fixed on hydraulic valve spool.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (11)
1. a displacement measurement equipment for hydraulic valve spool, is characterized in that, comprising:
Displacement conduction device (2) and displacement measuring device (4a), described displacement conduction device (2) comprises pedestal (21) and head rod (22);
Described pedestal (21) vacuum suction is on described hydraulic valve spool (3), the first end (221) of described head rod (22) is fixed on described pedestal (21), second end (222) of described head rod (22) is connected with described displacement measuring device (4a), to realize the displacement measurement of described hydraulic valve spool (3) when described hydraulic valve spool (3) is mobile.
2. displacement measurement equipment according to claim 1, is characterized in that,
Described pedestal (21) comprises vacuum cup (211), and it is upper that described vacuum cup (211) is adsorbed in described hydraulic valve spool (3), and is provided with connecting hole (1a) in a side of described hydraulic valve spool (3) dorsad;
The first end (221) of described head rod (22) is suitable with described connecting hole (1a), while inserting described connecting hole (1a) with the first end in described head rod (22) (221), the first end of described head rod (22) is fixed in described connecting hole (1a).
3. displacement measurement equipment according to claim 2, is characterized in that,
Described pedestal (21) comprises the first check valve assembly, described the first check valve assembly at least comprises the first inner elements of check valve (212), in described vacuum cup (211), be provided with air duct (2a), the air intake opening (2a1) of described air duct (2a) is communicated with the space between described vacuum cup (211) and described hydraulic valve spool (3), the gas outlet (2a2) of described air duct (2a) is communicated with described connecting hole (1a), described the first inner elements of check valve (212) is arranged in described air duct (2a), so that the air one-way flow direction of described air duct (2a) is from described air intake opening (2a1) to described gas outlet (2a2),
The inside of described head rod (22) is hollow cavity (3a), in the time of in the first end (221) of described head rod (22) is fixed on described connecting hole (1a) described in hollow cavity (3a) be communicated with the gas outlet (2a2) of described air duct (2a);
In described hollow cavity (3a), be provided with the piston body (23) of axial activity, so that the gas between described vacuum cup (211) and described hydraulic valve spool (3) is sucked the described hollow cavity (3a) between described piston body (23) and the first end (221) of described head rod (22) from described air duct (2a).
4. displacement measurement equipment according to claim 3, is characterized in that,
Described the first check valve assembly comprises the first O-ring seal (213), the first elastic component (214) and cover plate (215), and described cover plate (215) is provided with the first pilot hole (2151) and at least one the first through hole (2152);
Described cover plate (215) is plugged in the gas outlet (2a2) of described air duct (2a), described the first inner elements of check valve (212) is positioned between described cover plate (215) and the air intake opening (2a1) of described air duct (2a), and one end end face of described the first inner elements of check valve (212) is provided with the first teat (2121), described the first teat (2121) penetrates first pilot hole (2151) of described cover plate (215), the other end end face of described the first inner elements of check valve (212) is provided with the second teat (2122), described air duct (2a) internal diameter at described the second teat (2122) place and described the second teat (2122) external diameter are adaptive,
Described the first elastic component (214) elasticity is resisted against between one end end face and described cover plate (215) that described the first inner elements of check valve (212) is provided with the first teat (2121), and described the first O-ring seal (213) is arranged between one end end face of described the second teat of being provided with of described the first inner elements of check valve (212) (2122) and the conduit wall of described air duct (2a).
5. displacement measurement equipment according to claim 3, is characterized in that,
Described vacuum cup (211) is provided with second through hole (2112) separate with described air duct (2a), described pedestal (21) also comprises seal assembly, described seal assembly is arranged at described the second through hole (2112) end opening of described hydraulic valve spool (3) dorsad, to seal described the second through hole (2112).
6. displacement measurement equipment according to claim 3, is characterized in that,
Described piston body (23) is provided with the 3rd through hole (232), described head rod (22) comprises the second check valve assembly (24), described the second check valve assembly (24) comprises threaded rod (241), nut (242) and the second elastic component (243), described threaded rod (241) runs through described the 3rd through hole (232) from a side of second end (222) of the close described head rod (22) of described piston body (23), described nut (242) is fixed on the afterbody that described threaded rod (241) passes described the 3rd through hole (232), described the second elastic component (243) is arranged between described nut (242) and described piston body (23).
7. displacement measurement equipment according to claim 2, is characterized in that,
Described vacuum cup (211) comprises the first housing (91) and flexible the second housing (92), and it is upper that described the second housing (92) is attached at described hydraulic valve spool (3), and described the first housing (91) is overlapped on described the second housing (92);
Wherein, described the first housing (91) dorsad side of described the second housing (92) is provided with described connecting hole (1a), wherein, described connecting hole (1a) is through hole, the first end (221) of described head rod (22) inserts described connecting hole (1a) to push described the second housing (92), and then the gas between described the second housing (92) and described hydraulic valve spool (3) is discharged.
8. displacement measurement equipment according to claim 1, is characterized in that, described displacement measurement equipment also comprises:
Cover body (5) and bracing or strutting arrangement (6), it is upper that described bracing or strutting arrangement (6) is fixed on described cover body (5), and described displacement measuring device (4a) is installed on described bracing or strutting arrangement (6);
It is upper that described cover body (5) is located at hydraulic valve body (7), so that described hydraulic valve spool (3) is arranged in the confined space that described cover body (5) and described hydraulic valve body (7) form;
Described cover body (5) is provided with through hole (52), and second end (222) of described head rod (22) passes described through hole (52) to be connected with described displacement measuring device (4a).
9. displacement measurement equipment according to claim 8, is characterized in that,
Described bracing or strutting arrangement (6) comprise support bar (61), for relatively described support bar (61) highly adjustable fix bracing frame (62) and the first fixture (64) of described displacement measuring device (4a), described support bar (61) is fixed on described cover body (5);
On the length direction of described support bar (61), be provided with at least one the 4th through hole (611), on support frame as described above (62), be provided with the 5th through hole (621), described the first fixture (64) runs through described the 4th through hole (611) and described the 5th through hole (621) successively, support frame as described above (62) is fixed on alternatively to the diverse location on the length direction of described support bar (61).
10. displacement measurement equipment according to claim 9, is characterized in that,
The rectangular parallelepiped support bar of described support bar (61) described head rod (22) for length direction is parallel to, described bracing or strutting arrangement (6) comprises the square body slide block (65) that can slide on described support bar along the length direction of described support bar;
One side of described side's body slide block (65) is vertical with the axis of described support bar (61), and is close to support frame as described above (62), so that support frame as described above (62) is vertically set on described support bar (61) along the short transverse of described support bar (61).
11. displacement measurement equipment according to claim 9, is characterized in that,
Described the 5th through hole (621) is greater than the portion of running through that described the first fixture (64) runs through described the 5th through hole (621) along the aperture in the short transverse of described support bar (61), so that described the first fixture (64) runs through the diverse location of described the 5th through hole (621) in the short transverse of described support bar (61) alternatively, and then support frame as described above (62) is fixed on described support bar (61) highly adjustablely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420100964.9U CN203772245U (en) | 2014-03-06 | 2014-03-06 | Displacement test equipment for valve core of hydraulic valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420100964.9U CN203772245U (en) | 2014-03-06 | 2014-03-06 | Displacement test equipment for valve core of hydraulic valve |
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| CN203772245U true CN203772245U (en) | 2014-08-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225680A (en) * | 2016-07-25 | 2016-12-14 | 北京英创汇智科技有限公司 | A kind of spool displacement measurement apparatus based on laser displacement sensor and method |
| CN106609784A (en) * | 2015-10-21 | 2017-05-03 | 北京精密机电控制设备研究所 | Valve element micrometric displacement testing device |
| CN106918161A (en) * | 2017-03-27 | 2017-07-04 | 广东美的制冷设备有限公司 | A kind of Gas-supplying enthalpy-increasing heat pump and its heat-production control method |
| CN114278650A (en) * | 2022-03-09 | 2022-04-05 | 江苏恒立液压科技有限公司 | Multi-way valve core displacement detection device |
-
2014
- 2014-03-06 CN CN201420100964.9U patent/CN203772245U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609784A (en) * | 2015-10-21 | 2017-05-03 | 北京精密机电控制设备研究所 | Valve element micrometric displacement testing device |
| CN106609784B (en) * | 2015-10-21 | 2018-07-27 | 北京精密机电控制设备研究所 | A kind of spool micro displacement testing device |
| CN106225680A (en) * | 2016-07-25 | 2016-12-14 | 北京英创汇智科技有限公司 | A kind of spool displacement measurement apparatus based on laser displacement sensor and method |
| CN106225680B (en) * | 2016-07-25 | 2019-05-14 | 天津英创汇智汽车技术有限公司 | A kind of spool displacement measuring device and method based on laser displacement sensor |
| CN106918161A (en) * | 2017-03-27 | 2017-07-04 | 广东美的制冷设备有限公司 | A kind of Gas-supplying enthalpy-increasing heat pump and its heat-production control method |
| CN106918161B (en) * | 2017-03-27 | 2023-12-22 | 广东美的制冷设备有限公司 | Air supplementing and enthalpy increasing heat pump system and heating control method thereof |
| CN114278650A (en) * | 2022-03-09 | 2022-04-05 | 江苏恒立液压科技有限公司 | Multi-way valve core displacement detection device |
| CN114278650B (en) * | 2022-03-09 | 2022-05-06 | 江苏恒立液压科技有限公司 | Multi-way valve core displacement detection device |
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Granted publication date: 20140813 Termination date: 20160306 |