CN202811607U - Device preventing oil cylinder form moving forward and crane - Google Patents
Device preventing oil cylinder form moving forward and crane Download PDFInfo
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- CN202811607U CN202811607U CN 201220429573 CN201220429573U CN202811607U CN 202811607 U CN202811607 U CN 202811607U CN 201220429573 CN201220429573 CN 201220429573 CN 201220429573 U CN201220429573 U CN 201220429573U CN 202811607 U CN202811607 U CN 202811607U
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- fluid port
- oil cylinder
- check device
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- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 138
- 239000000945 filler Substances 0.000 claims description 29
- 239000002828 fuel tank Substances 0.000 claims description 9
- 239000003921 oil Substances 0.000 description 155
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 210000003128 Head Anatomy 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model discloses a device preventing an oil cylinder from moving forward and a crane, and relates to the technical field of engineering machinery. The device preventing the oil cylinder from moving forward solves the technical problems in the prior art that a superlift locking oil cylinder is prone to moving forward and accidents are caused accordingly. The device preventing the oil cylinder from moving forward comprises a non-return device and a reversing valve. A first oil port of the non-return device is communicated with a cavity of the oil cylinder, wherein the cylinder is provided with a piston. When the reversing valve is in a first state, the first oil port of the non-return device is disconnected with a second oil port of the non-return device or when the pressure of liquid which flows from the first oil port of the non-return device to the second oil port of the non-return device surpasses a preset valve, the first oil port of the non-return device is communicated with the second oil port of the non-return device. When the reversing valve is in a second state, the first oil port of the non-return device is communicated with the second oil port of the non-return device. The crane comprises the device preventing the oil cylinder from moving forward. The device preventing the oil cylinder from moving forward is used for preventing the phenomenon that the oil cylinder moves forward from happening.
Description
Technical field
The utility model relates to technical field of engineering machinery, is specifically related to a kind ofly prevent the device of altering before the oil cylinder and the hoist that this prevents the device of altering before the oil cylinder is set.
Background technique
Super lifting device is a kind of for improving the performance of main arm of crane, the basic arm of principal arm install additional surpass arm make its with principal arm formation three-legged structure with the intensity of increase principal arm, the device of raising lift heavy performance.
Fig. 1 has illustrated super lift winch 4 and principal arm arm head 61, principal arm arm tail 62 in the prior art and has surpassed position relationship between the arm 5.
On the modern crane tool, increased the lift heavy performance of principal arm medium and long distance by using super lifting device.When adjusting the principal arm operating mode, need to have surpassed as shown in Figure 2 the piston rod retraction rod chamber of locking oil cylinder 30, and then make super lift winch be in released state, then allow super lift winch rotate along with the flexible of principal arm.
At least there is following technical problem in the prior art:
Since in the prior art in the process of flexible principal arm; the piston rod of locking oil cylinder 30 stretches out rod chamber in unwanted situation phenomenon usually can appear having surpassed as shown in Figure 2; this phenomenon is altered before being called as the locking oil cylinder; surpassed to alter before the locking oil cylinder 30 and might cause having surpassed locking oil cylinder 30 and when super lift winch rotates, will surpass the lift winch locking; the lighter causes the large brachiocylloosis of super lift winch, and severe one causes the Accident of Large-scale of car crash.
The model utility content
The purpose of this utility model is to propose a kind ofly to prevent the device of altering before the oil cylinder and the hoist that this prevents the device of altering before the oil cylinder is set, and has solved prior art and has existed and surpass the locking oil cylinder and alter and accidents caused technical problem before easy.
For achieving the above object, the utility model provides following technological scheme:
The utility model provides prevents from the device of altering before the oil cylinder from comprising check device and selector valve, wherein:
Described check device is provided with the first hydraulic fluid port and the second hydraulic fluid port, and the first hydraulic fluid port of described check device is connected with the rod chamber of oil cylinder;
Described selector valve exists the first state and the second state at least;
When described selector valve was in the first state, the second hydraulic fluid port of described check device and the rodless cavity of described oil cylinder all were connected with the return opening of described selector valve; And the first hydraulic fluid port of described check device and the second hydraulic fluid port of described check device disconnects between the two or the first hydraulic fluid port of the pressure of liquid that flows to the second hydraulic fluid port of described check device from the first hydraulic fluid port of the rod chamber of described oil cylinder and described check device described check device when surpassing predetermined value and the second hydraulic fluid port conducting of described check device;
When described selector valve is in the second state, the second hydraulic fluid port of described check device is connected with the filler opening of described selector valve, the rodless cavity of described oil cylinder is connected with the return opening of described selector valve, and the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described check device and described check device.
Alternatively, described check device comprises one-way valve and spring non-return valve, wherein:
Be connected with the first hydraulic fluid port of described check device after the filler opening parallel connection of the oil outlet of described one-way valve and described spring non-return valve;
Be connected with the second hydraulic fluid port of described check device after the oil outlet parallel connection of the filler opening of described one-way valve and described spring non-return valve.
Alternatively, described check device comprises one-way valve and throttle valve, wherein:
Be connected with the first hydraulic fluid port of described check device after the oil outlet parallel connection of the oil outlet of described one-way valve and described throttle valve;
Be connected with the second hydraulic fluid port of described check device after the filler opening parallel connection of the filler opening of described one-way valve and described throttle valve.
Alternatively, described check device comprises relief valve and one-way valve, wherein:
The oil outlet of described one-way valve and the filler opening of described relief valve all are connected with the first hydraulic fluid port of described check device;
The filler opening of described one-way valve and the return opening of described relief valve all are connected with the second hydraulic fluid port of described check device.
Alternatively, described check device comprises the first Pilot operated check valve, wherein:
The first hydraulic fluid port of described the first Pilot operated check valve is the first hydraulic fluid port of described check device;
The second hydraulic fluid port of described the first Pilot operated check valve is the second hydraulic fluid port of described check device;
The control mouth of described the first Pilot operated check valve is connected with the rodless cavity of described oil cylinder;
When the pressure of liquid of inputting the control mouth of described the first Pilot operated check valve reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described the first Pilot operated check valve and described the first Pilot operated check valve.
Alternatively, also be connected with the second Pilot operated check valve between the rodless cavity of described oil cylinder and the described selector valve, wherein:
The first hydraulic fluid port of described the second Pilot operated check valve is connected with the rodless cavity of described oil cylinder;
When described selector valve was in the first state and the second state, the second hydraulic fluid port of described the second Pilot operated check valve was connected with the return opening of described selector valve;
The control mouth of described the second Pilot operated check valve is connected with the second hydraulic fluid port of described check device, when the pressure of liquid of inputting the control mouth of described the second Pilot operated check valve reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described the second Pilot operated check valve and described the second Pilot operated check valve.
Alternatively, the control mouth of described the first Pilot operated check valve is connected with the second hydraulic fluid port of described the second Pilot operated check valve.
Alternatively, described selector valve is solenoid valve.
Alternatively, described selector valve is Y type three-position four-way valve, and also there is the third state in described selector valve, wherein:
When described selector valve was in the first state, described Y type three-position four-way valve was in the meta working position, and described selector valve is in the second state, and described Y type three-position four-way valve is in working position, right position;
When described selector valve was in the third state, described Y type three-position four-way valve was in working position, left position, and the second hydraulic fluid port of described check device is connected with the return opening of described selector valve, and the rodless cavity of described oil cylinder is connected with the filler opening of described selector valve.
The device that the hoist that the utility model provides, preventing of comprising that the arbitrary technological scheme of super lift winch, oil cylinder, oil supplying device, fuel tank and the utility model provides are altered before the oil cylinder, wherein:
Described oil cylinder is for having surpassed the locking oil cylinder;
The filler opening of the described selector valve in the described device that prevents from altering before the oil cylinder is connected with the oil outlet of described oil supplying device;
The return opening of described selector valve is connected with described fuel tank.
Based on technique scheme, the utility model embodiment can produce following technique effect at least:
The piston rod of the oil cylinder (for example: surpassed the locking oil cylinder) of the device that preventing of using that the utility model provides altered before the oil cylinder will stretch out rod chamber, liquid (being generally hydraulic oil) in the rod chamber must flow to from the first hydraulic fluid port of check device the second hydraulic fluid port of check device so, final flow out (can flow out to fuel tank) from the return opening of selector valve again, control selector valve for this reason, make selector valve be in the first state, at this moment, the first hydraulic fluid port of check device and the second hydraulic fluid port of check device disconnects between the two or from the rod chamber of oil cylinder, the first hydraulic fluid port of check device and the second hydraulic fluid port of check device were just understood conducting when the pressure of liquid that the first hydraulic fluid port of check device flows to the second hydraulic fluid port of check device surpassed predetermined value (size of this predetermined value can arrange as required), so check device has increased the resistance of flow of fluid to the process of the return opening of selector valve in the rod chamber, played prevention, hinder the effect that the liquid in the cylinder rod chamber flows out, and then avoided altering the generation of phenomenon before the oil cylinder, exist and surpass the locking oil cylinder and to alter and accidents caused technical problem before easy so solved prior art.
When needing the piston rod retraction rod chamber of oil cylinder, the control selector valve, make selector valve be in the second state, at this moment, the second hydraulic fluid port of check device is connected with the filler opening of selector valve, the rodless cavity of oil cylinder is connected with the return opening of selector valve, and the second hydraulic fluid port conducting between the two (situation that comprises cracking pressure that need to be very little) of the first hydraulic fluid port of check device and check device, can be than finally entering cylinder rod chamber through the first hydraulic fluid port of check device and the second hydraulic fluid port of check device more smoothly from the liquid that the filler opening of selector valve is inputted, and the liquid in the rodless cavity of oil cylinder can flow out from the return opening of selector valve, has realized thus the smooth retraction of the piston rod of oil cylinder.
Compared with prior art, the optimal technical scheme that provides of the utility model has following advantage at least:
1, the utility model is used prevents the method for altering before the crane super lifting locking oil cylinder, utilize double linked one-way valve to make to have surpassed the locking cylinder rod chamber and kept certain back pressure, make rod chamber and rodless cavity pressure keep balance, avoid under released state before scurry out now, improved the Security that the user uses;
2, the utility model is used prevents the method for altering before the crane super lifting locking oil cylinder, and when surpass the locking oil cylinder and bouncing back, the cracking pressure that needs are very little has reduced the pressure loss and the heating value of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is super lift winch and principal arm arm head in the prior art, principal arm arm tail and the schematic representation that surpassed position relationship between the arm;
Fig. 2 be surpassed annexation between locking oil cylinder and the selector valve in the prior art and surpassed the locking oil cylinder and super lift winch between the schematic representation of position relationship;
Check device in the device that prevents from altering before the oil cylinder that Fig. 3 provides for a kind of mode of execution of the utility model embodiment, surpassed annexation between locking oil cylinder and the selector valve and surpassed the locking oil cylinder and super lift winch between the schematic representation of position relationship;
Check device in the device that prevents from altering before the oil cylinder that Fig. 4 provides for the utility model embodiment's another kind of mode of execution, surpassed annexation between locking oil cylinder and the selector valve and surpassed the locking oil cylinder and super lift winch between the schematic representation of position relationship;
Check device in the device that prevents from altering before the oil cylinder that Fig. 5 provides for another mode of execution of the utility model embodiment, surpassed annexation between locking oil cylinder and the selector valve and surpassed the locking oil cylinder and super lift winch between the schematic representation of position relationship;
Check device in the device that prevents from altering before the oil cylinder that Fig. 6 provides for another mode of execution of the utility model embodiment, surpassed annexation between locking oil cylinder and the selector valve and surpassed the locking oil cylinder and super lift winch between the schematic representation of position relationship.
Mark among the figure: 1, check device; 11, the first hydraulic fluid port of check device; 12, the second hydraulic fluid port of check device; 131, one-way valve; 132, one-way valve; 133, one-way valve; 14, spring non-return valve; 15, throttle valve; 16, relief valve; 17, the first Pilot operated check valve; 18, the second Pilot operated check valve; 2, selector valve; 3, oil cylinder; 30, surpassed the locking oil cylinder; 31, rod chamber; 32, rodless cavity; 33, piston rod; 4, super lift winch; 5, surpassed arm; 61, principal arm arm head; 62, principal arm arm tail; 7, auxiliary cylinder.
Embodiment
Below by accompanying drawing Fig. 3～Fig. 6 and the mode of enumerating optional embodiments more of the present utility model, the technical solution of the utility model (comprising optimal technical scheme) is described in further detail.Need to prove: any technical characteristics in the present embodiment; any technological scheme all is the technical characteristics of plurality of optional or one or more in the optional technological scheme; can't exhaustive all alternative technical characteristicss of the present utility model and alternative technological scheme in order to describe succinct need in the presents; the mode of execution that also is not easy to each technical characteristics emphasizes that all it is one of optional numerous embodiments; so those skilled in the art should know: any technical characteristics and any technological scheme in the present embodiment all do not limit protection domain of the present utility model, and protection domain of the present utility model should comprise that those skilled in the art do not pay the thinkable any alternate embodiments of creative work.
The utility model embodiment provides a kind of and can effectively prevent from altering before the oil cylinder, simple in structure, be convenient to connect and with low cost prevent the device of altering before the oil cylinder and the hoist that this prevents the device of altering before the oil cylinder is set.
Below in conjunction with Fig. 3～Fig. 6 the technological scheme that the utility model provides is carried out more detailed elaboration, the technological scheme that arbitrary technological means that the utility model is provided is replaced or two or more technological means that the utility model provides are made up mutually and obtains all should be within protection domain of the present utility model.
Such as Fig. 3～shown in Figure 6, the utility model embodiment provides prevents from the device of altering before the oil cylinder from comprising check device 1 and selector valve 2, wherein:
Check device 1 is provided with the first hydraulic fluid port 11 and the second hydraulic fluid port 12, and the first hydraulic fluid port 11 of check device 1 is connected with the rod chamber 31 of oil cylinder 3.
Selector valve 2 exists the first state and the second state at least.
When selector valve 2 is in the first state, the second hydraulic fluid port 12 of check device 1 and the rodless cavity 32 of oil cylinder 3 all are connected with the oil return inlet T of selector valve 2, and the second hydraulic fluid port 12 of the first hydraulic fluid port 11 of check device 1 and check device 1 disconnects between the two or the first hydraulic fluid port 11 of the pressure of liquid that flows to the second hydraulic fluid port 12 of check device 1 from the first hydraulic fluid port 11 of the rod chamber 31 of oil cylinder 3 and check device 1 check device 1 when surpassing predetermined value and the second hydraulic fluid port 12 conductings of check device 1.
When selector valve 2 is in the second state, the second hydraulic fluid port 12 of check device 1 is connected with the oil inlet P of selector valve 2, the rodless cavity 32 of oil cylinder 3 is connected with the oil return inlet T of selector valve 2, and the first hydraulic fluid port 11 of check device 1 and the second hydraulic fluid port 12 conducting between the two of check device 1.
Be preferably in this example of oil cylinder 3(and surpassed the locking oil cylinder) piston rod 33 to stretch out rod chamber 31, liquid (being generally hydraulic oil) in the rod chamber 31 must flow to from the first hydraulic fluid port 11 of check device 1 the second hydraulic fluid port 12 of check device 1 so, final flow out (can flow out to fuel tank) from the oil return inlet T of selector valve 2 again, control selector valve 2 for this reason, make selector valve 2 be in the first state, at this moment, the first hydraulic fluid port 11 of check device 1 disconnects between the two with the second hydraulic fluid port 12 of check device 1 or the pressure of liquid that flows to the second hydraulic fluid port 12 of check device 1 from the first hydraulic fluid port 11 of the rod chamber 31 of oil cylinder 3 and check device 1 when surpassing predetermined value (size of this predetermined value can arrange as required) the first hydraulic fluid port 11 of check device 1 just understand conducting with the second hydraulic fluid port 12 of check device 1, so check device 1 has increased the resistance of flow of fluid to the process of the oil return inlet T of selector valve 2 in the rod chamber 31, played prevention, hinder the effect that the liquid in the rod chamber 31 flow out, and then avoided altering before the oil cylinder 3 generation of phenomenon.
When needing the piston rod 33 retraction rod chamber 31 of oil cylinder 3, control selector valve 2, make selector valve 2 be in the second state, at this moment, the second hydraulic fluid port 12 of check device 1 is connected with the oil inlet P of selector valve 2, the rodless cavity 32 of oil cylinder 3 is connected with the oil return inlet T of selector valve 2, and the first hydraulic fluid port 11 of check device 1 and the second hydraulic fluid port 12 conducting between the two of check device 1, can be than finally entering oil cylinder 3 rod chambers 31 through the first hydraulic fluid port 11 of check device 1 and the second hydraulic fluid port 12 of check device 1 more smoothly from the liquid that the oil inlet P of selector valve 2 is inputted, and the liquid in the rodless cavity 32 of oil cylinder 3 can flow out from the oil return inlet T of selector valve 2, has realized thus the smooth retraction of the piston rod 33 of oil cylinder 3.
Such as Fig. 3～shown in Figure 6, check device 1 several more preferably mode of executions of providing of more detailed elaboration the utility model hereinafter, any of mode of execution that the utility model is provided is equal to replacement all within protection domain of the present utility model.
Check device mode of execution 1:
As shown in Figure 3, check device 1 comprises one-way valve 131 and spring non-return valve 14 in the present embodiment, wherein:
Be connected with the first hydraulic fluid port 11 of check device 1 after the filler opening parallel connection of the oil outlet of one-way valve 131 and spring non-return valve 14.
Be connected with the second hydraulic fluid port 12 of check device 1 after the oil outlet parallel connection of the filler opening of one-way valve 131 and spring non-return valve 14.
Liquid is from the process of rod chamber 31 outflows of oil cylinder 3, when the oil outlet direction of first hydraulic fluid port 11 of the liquid that flows out from the rod chamber 31 of oil cylinder 3 by check device 1 from the filler opening of spring non-return valve 14 toward spring non-return valve 14 flows, if the pressure of this liquid has surpassed the predetermined value of spring non-return valve 14, then liquid just can flow to from the filler opening of spring non-return valve 14 oil outlet and the final return opening that flows out to selector valve 2 from the oil outlet of spring non-return valve 14 of spring non-return valve 14, meanwhile, one-way valve 131 is in cut-off state.
Check device mode of execution 2:
As shown in Figure 4, check device 1 comprises one-way valve 132 and throttle valve 15 in the present embodiment, wherein:
Be connected with the first hydraulic fluid port 11 of check device 1 after the oil outlet parallel connection of the oil outlet of one-way valve 132 and throttle valve 15.
Be connected with the second hydraulic fluid port 12 of check device 1 after the filler opening parallel connection of the filler opening of one-way valve 132 and throttle valve 15.
Similar to spring non-return valve 14 principles, throttle valve 15 can increase the liquid that flows out from the rod chamber 31 of oil cylinder 3 resistance from the oil outlet of throttle valve 15 toward the filler opening direction flow process of throttle valve 15.
Check device mode of execution 3:
As shown in Figure 5, check device 1 comprises relief valve 16 and one-way valve 133 in the present embodiment, wherein:
The filler opening of the oil outlet of one-way valve 133 and relief valve 16 all is connected with the first hydraulic fluid port 11 of check device 1.
The return opening of the filler opening of one-way valve 133 and relief valve 16 all is connected with the second hydraulic fluid port 12 of check device 1.
Be preferably in this example: one-way valve 133 is connected with relief valve 16.
Similar to spring non-return valve 14 principles, the liquid that relief valve 16 also can play in the rod chamber 31 that increases oil cylinder 3 flows to resistance the second hydraulic fluid port 12 processes of check device 1 from the first hydraulic fluid port 11 of check device 1, and then plays and prevent the purpose of altering before the oil cylinder 3.
Check device mode of execution 4:
As shown in Figure 6, check device 1 comprises the first Pilot operated check valve 17 in the present embodiment, wherein:
The first hydraulic fluid port of the first Pilot operated check valve 17 is the first hydraulic fluid port 11 of check device 1.
The second hydraulic fluid port of the first Pilot operated check valve 17 is the second hydraulic fluid port 12 of check device 1.
The control mouth of the first Pilot operated check valve 17 is connected with the rodless cavity 32 of oil cylinder 3.
When the pressure of the liquid of the control mouth input of the first Pilot operated check valve 17 reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of the first Pilot operated check valve 17 and the first Pilot operated check valve 17.
When selector valve 2 is in the third state (at this moment, Y type three-position four-way valve is in working position, left position, this state can describe in detail hereinafter) time, when liquid flows to the rodless cavity 32 of oil cylinder 3 from the oil inlet P of selector valve 2, because the control mouth of the first Pilot operated check valve 17 is connected with the rodless cavity 32 of oil cylinder 3, the control mouth that the partially liq that flows to the rodless cavity 32 of oil cylinder 3 can input to the first Pilot operated check valve 17 makes the second hydraulic fluid port conducting between the two of the first hydraulic fluid port and first Pilot operated check valve 17 of the first Pilot operated check valve 17, then, liquid in the rod chamber 31 of oil cylinder 3 just can flow to from the second hydraulic fluid port of the first Pilot operated check valve 17 the first hydraulic fluid port of the first Pilot operated check valve 17, and finally the oil return inlet T from selector valve 2 flows out.If do not have flow of fluid to the rodless cavity 32 of oil cylinder 3 or to flow to the pressure of liquid of rodless cavity 32 of oil cylinder 3 lower, when causing the pressure of liquid of the control mouth input of the first Pilot operated check valve 17 not reach predetermined value, the second hydraulic fluid port of the first hydraulic fluid port of the first Pilot operated check valve 17 and the first Pilot operated check valve 17 is closed, liquid in the rod chamber 31 of oil cylinder 3 can't flow out, so piston rod 33 can not stretch out from the rod chamber 31 of oil cylinder 3 yet.
Also be connected with the second Pilot operated check valve 18 in the present embodiment between the rodless cavity 32 of oil cylinder 3 and the selector valve 2, wherein:
The first hydraulic fluid port of the second Pilot operated check valve 18 is connected with the rodless cavity 32 of oil cylinder 3.
When selector valve 2 was in the first state and the second state, the second hydraulic fluid port of the second Pilot operated check valve 18 all was connected with the oil return inlet T of selector valve 2.
The control mouth of the second Pilot operated check valve 18 is connected with the second hydraulic fluid port 12 of check device 1, when the pressure of liquid of inputting the control mouth of the second Pilot operated check valve 18 reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of the second Pilot operated check valve 18 and the second Pilot operated check valve 18.
The second Pilot operated check valve 18 can be avoided piston rod 33 retraction when not needing to bounce back, and when the setting of the second Pilot operated check valve 18 increased the pressure in the rod chamber 31 of oil cylinder 3, the Simultaneous Pressures in the rodless cavity 32 of oil cylinder 3 reduced.The control mouth of the first Pilot operated check valve 17 is connected with the second hydraulic fluid port of the second Pilot operated check valve 18 in the present embodiment.
When the setting of the first Pilot operated check valve 17 increased the rodless cavity 32 interior pressure of oil cylinder 3, the Simultaneous Pressures in the rod chamber 31 of oil cylinder 3 reduced.Selector valve 2 is solenoid valve in the present embodiment.Solenoid valve has is convenient to control, sensitive advantage.
Selector valve 2 is Y type three-position four-way valve in the present embodiment, and also there is the third state in selector valve 2, wherein:
When selector valve 2 was in the first state, Y type three-position four-way valve was in the meta working position, and the second hydraulic fluid port of the second hydraulic fluid port 12 of check device 1 and the second Pilot operated check valve 18 all is connected with the oil return inlet T of selector valve 2.If when Y type three-position four-way valve was in such as Fig. 3～meta shown in Figure 6 working position, the piston rods 33 in the oil cylinder 3 were in halted state.
Selector valve 2 is in the second state, and Y type three-position four-way valve is in working position, right position.At this moment, 33 retractions of the piston rod in the oil cylinder 3.
When selector valve 2 was in the third state, Y type three-position four-way valve was in working position, left position, and at this moment, the second hydraulic fluid port 12 of check device 1 is connected with the oil return inlet T of selector valve 2, and the rodless cavity 32 of oil cylinder 3 is connected with the oil inlet P of selector valve 2.At this moment, the piston rod 33 in the oil cylinder 3 is overhanging.
Such as Fig. 3～shown in Figure 6, the hoist that the utility model embodiment provides, the device that preventing of comprising that super lift winch 4, oil cylinder 3, oil supplying device (not shown), fuel tank (among the figure sign) and the arbitrary technological scheme of the utility model provide altered before the oil cylinder, wherein: oil cylinder 3 is for having surpassed the locking oil cylinder.The oil inlet P of the selector valve 2 in the device that prevents from altering before the oil cylinder is connected with the oil outlet of oil supplying device.The oil return inlet T of selector valve 2 is connected with fuel tank.The fuel tank that the oil return inlet T of selector valve 2 connects can reclaim the liquid of the oil return inlet T outflow of selector valve 2.
Because the device of altering before the oil cylinder that prevents that the utility model provides has many technique effects that preamble has been stated, so surpass the locking oil cylinder in the hoist of the device that preventing of using that the arbitrary technological scheme of the utility model provides altered before the oil cylinder, can have played and good alter effect before preventing.
Oil supplying device can adopt oil hydraulic pump, and oil supplying device can be the liquid (be generally hydraulic oil) of the oil inlet P of selector valve 2 input with pressure, thus by the overhanging or retraction of piston rod by the liquid driven oil cylinder 3 of the oil inlet P input of selector valve 2.
The technological scheme of the application of installation that preventing of certainly, the utility model being provided altered before the oil cylinder other oil cylinders outside the locking oil cylinder in super is also within protection domain of the present utility model.
The oil cylinder 3 outer auxiliary cylinders 7 that also are provided with in the present embodiment, auxiliary cylinder 7 can when piston rod 33 retraction of oil cylinder 3, deviate from oil cylinder 3 courts the direction jack-up of super lift winch 4.Can more efficientlyly avoid thus 33 pairs of super lift winchs 4 of piston rod of oil cylinder 3 to apply butt power and cause super lift winch 4 that locking phenomenon and accidents caused occurs.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characteristics is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope that the utility model asks for protection.
Claims (10)
1. a device that prevents from altering before the oil cylinder is characterized in that, comprises check device and selector valve, wherein:
Described check device is provided with the first hydraulic fluid port and the second hydraulic fluid port, and the first hydraulic fluid port of described check device is connected with the rod chamber of oil cylinder;
Described selector valve exists the first state and the second state at least;
When described selector valve was in the first state, the second hydraulic fluid port of described check device and the rodless cavity of described oil cylinder all were connected with the return opening of described selector valve; And the first hydraulic fluid port of described check device and the second hydraulic fluid port of described check device disconnects between the two or the first hydraulic fluid port of the pressure of liquid that flows to the second hydraulic fluid port of described check device from the first hydraulic fluid port of the rod chamber of described oil cylinder and described check device described check device when surpassing predetermined value and the second hydraulic fluid port conducting of described check device;
When described selector valve is in the second state, the second hydraulic fluid port of described check device is connected with the filler opening of described selector valve, the rodless cavity of described oil cylinder is connected with the return opening of described selector valve, and the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described check device and described check device.
2. the device of altering before the oil cylinder of preventing according to claim 1 is characterized in that described check device comprises one-way valve and spring non-return valve, wherein:
Be connected with the first hydraulic fluid port of described check device after the filler opening parallel connection of the oil outlet of described one-way valve and described spring non-return valve;
Be connected with the second hydraulic fluid port of described check device after the oil outlet parallel connection of the filler opening of described one-way valve and described spring non-return valve.
3. the device of altering before the oil cylinder of preventing according to claim 1 is characterized in that described check device comprises one-way valve and throttle valve, wherein:
Be connected with the first hydraulic fluid port of described check device after the oil outlet parallel connection of the oil outlet of described one-way valve and described throttle valve;
Be connected with the second hydraulic fluid port of described check device after the filler opening parallel connection of the filler opening of described one-way valve and described throttle valve.
4. the device of altering before the oil cylinder of preventing according to claim 1 is characterized in that described check device comprises relief valve and one-way valve, wherein:
The oil outlet of described one-way valve and the filler opening of described relief valve all are connected with the first hydraulic fluid port of described check device;
The filler opening of described one-way valve and the return opening of described relief valve all are connected with the second hydraulic fluid port of described check device.
5. the device of altering before the oil cylinder of preventing according to claim 1 is characterized in that described check device comprises the first Pilot operated check valve, wherein:
The first hydraulic fluid port of described the first Pilot operated check valve is the first hydraulic fluid port of described check device;
The second hydraulic fluid port of described the first Pilot operated check valve is the second hydraulic fluid port of described check device;
The control mouth of described the first Pilot operated check valve is connected with the rodless cavity of described oil cylinder;
When the pressure of liquid of inputting the control mouth of described the first Pilot operated check valve reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described the first Pilot operated check valve and described the first Pilot operated check valve.
6. the device of altering before the oil cylinder of preventing according to claim 5 is characterized in that, also is connected with the second Pilot operated check valve between the rodless cavity of described oil cylinder and the described selector valve, wherein:
The first hydraulic fluid port of described the second Pilot operated check valve is connected with the rodless cavity of described oil cylinder;
When described selector valve was in the first state and the second state, the second hydraulic fluid port of described the second Pilot operated check valve was connected with the return opening of described selector valve;
The control mouth of described the second Pilot operated check valve is connected with the second hydraulic fluid port of described check device, when the pressure of liquid of inputting the control mouth of described the second Pilot operated check valve reaches predetermined value, the second hydraulic fluid port conducting between the two of the first hydraulic fluid port of described the second Pilot operated check valve and described the second Pilot operated check valve.
7. the device of altering before the oil cylinder of preventing according to claim 6 is characterized in that the control mouth of described the first Pilot operated check valve is connected with the second hydraulic fluid port of described the second Pilot operated check valve.
8. the device of altering before the oil cylinder of preventing according to claim 6 is characterized in that described selector valve is solenoid valve.
9. the device of altering before the oil cylinder of preventing according to claim 6 is characterized in that described selector valve is Y type three-position four-way valve, and also there is the third state in described selector valve, wherein:
When described selector valve was in the first state, described Y type three-position four-way valve was in the meta working position, and described selector valve is in the second state, and described Y type three-position four-way valve is in working position, right position;
When described selector valve was in the third state, described Y type three-position four-way valve was in working position, left position, and the second hydraulic fluid port of described check device is connected with the return opening of described selector valve, and the rodless cavity of described oil cylinder is connected with the filler opening of described selector valve.
10. a hoist is characterized in that, comprises the arbitrary described device of altering before the oil cylinder of preventing of super lift winch, oil cylinder, oil supplying device, fuel tank and claim 1-9, wherein:
Described oil cylinder is for having surpassed the locking oil cylinder;
The filler opening of the described selector valve in the described device that prevents from altering before the oil cylinder is connected with the oil outlet of described oil supplying device;
The return opening of described selector valve is connected with described fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220429573 CN202811607U (en) | 2012-08-27 | 2012-08-27 | Device preventing oil cylinder form moving forward and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220429573 CN202811607U (en) | 2012-08-27 | 2012-08-27 | Device preventing oil cylinder form moving forward and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202811607U true CN202811607U (en) | 2013-03-20 |
Family
ID=47870489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220429573 Withdrawn - After Issue CN202811607U (en) | 2012-08-27 | 2012-08-27 | Device preventing oil cylinder form moving forward and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202811607U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN103434952A (en) * | 2013-09-11 | 2013-12-11 | 徐州重型机械有限公司 | Super-lift tensioning and locking mechanism and crane |
-
2012
- 2012-08-27 CN CN 201220429573 patent/CN202811607U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN103434952A (en) * | 2013-09-11 | 2013-12-11 | 徐州重型机械有限公司 | Super-lift tensioning and locking mechanism and crane |
| CN103434952B (en) * | 2013-09-11 | 2015-10-28 | 徐州重型机械有限公司 | One has surpassed tensioner lockable mechanism and hoisting crane |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130320 Effective date of abandoning: 20150513 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130320 Effective date of abandoning: 20150513 |
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| RGAV | Abandon patent right to avoid regrant |