CN204267402U - Prestressing force pull system - Google Patents
Prestressing force pull system Download PDFInfo
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- CN204267402U CN204267402U CN201420606793.7U CN201420606793U CN204267402U CN 204267402 U CN204267402 U CN 204267402U CN 201420606793 U CN201420606793 U CN 201420606793U CN 204267402 U CN204267402 U CN 204267402U
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- filler opening
- oil
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Abstract
The utility model discloses a kind of prestressing force pull system, relate to prestressed girder tensioning equipment technical field in the engineering constructions such as railway, highway, municipal bridge, this system comprises the tensioning pump station controlled by PLC, described tensioning pump station is connected with jack, described tensioning pump station comprises the oil pump being connected with motor, and the oil pipe between the oil outlet of described oil pump and the filler opening of described jack is connected with step-type flow control valve, selector valve and pressure-relief valve in turn; The oil outlet place of described pressure-relief valve is provided with the pressure transducer be connected with described PLC.The utility model solves the existing prestressing force pull system problem not high to the control precision of control stress for prestressing.
Description
Technical field
The utility model relates to prestressed girder tensioning equipment manufacturing technology field, especially a kind of prestressing force pull system.
Background technique
Current prestressing force intelligent tensioning system mainly comprises the tensioning pump station controlled by PLC (programmable controller) and the jack performed an action, wherein tensioning pump station comprises the oil pump being connected with motor, described oil pump is connected with described jack by oil pipe, and the oil pipe between the oil outlet and the filler opening of described jack of described oil pump is provided with on-off control valve.Because the maximum pressure of the hydraulic pipe line of prestressing force pull system will reach 63MPa, and the working pressure being generally used for the Proportional valve of Flow-rate adjustment is all less than 31.5MPa, therefore, the on-off control valve used in prestressing force pull system can only use only have unlatching or closing function and working pressure is more than or equal to the on-off control valve of 63MPa; Because this on-off control valve can not control the size of flow, the break-make that can only control flow controls to realize tension stress, causes the control precision of control stress for prestressing not high, usually occurs that control stress for prestressing is not enough or exceedes the phenomenon of control overflow.
Model utility content
The utility model provides a kind of prestressing force pull system, to solve the existing prestressing force pull system problem not high to the control precision of control stress for prestressing.
In order to solve the problem, the technological scheme that the utility model adopts is: this prestressing force pull system, comprise the tensioning pump station controlled by PLC, described tensioning pump station is connected with jack, described tensioning pump station comprises the oil pump being connected with motor, and the oil pipe between the oil outlet of described oil pump and the filler opening of described jack is connected with step-type flow control valve, selector valve and pressure-relief valve in turn; The oil outlet place of described pressure-relief valve is provided with the pressure transducer be connected with described PLC.
In technique scheme, technological scheme can also be more specifically: described flow control valve comprises the valve seat offering filler opening and the valve body be arranged on described valve seat, offer the up big and down small and uuper valve chamber be communicated with and lower valve chamber and the oil outlet that communicates with described uuper valve chamber in described valve body, described lower valve chamber communicates with described filler opening; In described uuper valve chamber, be provided with spherical valve core, described spherical valve core top is provided with the valve rod stretching out described uuper valve chamber; Be provided with the swash plate being installed on bottom surface on the output shaft of stepper motor and substantially horizontal and angularly arranging in the top of the described uuper valve chamber of described valve body, described valve rod and described output shaft are that offset distance is arranged and abutted against by the top of described valve rod and the bottom surface of described swash plate; Described lower valve chamber is provided with spring between the filler opening joint and described spherical valve core of described valve seat.
Further: the bottom surface of described swash plate and the angle of substantially horizontal are 3 ° ~ 7 °.
Further: described pressure-relief valve comprises the release valve seat and the release valve body be set in turn on described release valve seat and proportion electro-magnet that offer pressure-relief valve oil outlet, offer the up-small and down-big and upper release valve pocket be communicated with and lower release valve pocket and the pressure-relief valve filler opening that communicates with described upper release valve pocket in described release valve body, described lower release valve pocket communicates with described pressure-relief valve oil outlet; In described lower release valve pocket, be provided with spherical spool, described lower release valve pocket is provided with spring between the pressure-relief valve oil outlet joint of described release valve seat and described spherical spool; Described spherical spool top is provided with stretches out described upper release valve pocket and the release valve rod passing described proportion electro-magnet.
Further: the oil outlet of described oil pump is connected with the second hydraulic fluid port of described selector valve with the filler opening of described flow control valve, 3rd hydraulic fluid port of described selector valve is connected with the filler opening of described pressure-relief valve, the oil outlet of described pressure-relief valve is connected with the filler opening of described jack, the oil outlet of described jack is connected with the 4th hydraulic fluid port of described selector valve, first hydraulic fluid port of described selector valve is connected with fuel tank respectively with the oil outlet of described flow control valve, described flow control valve, the selector valve port corresponding to described PLC respectively with the control end of pressure-relief valve is connected.
Owing to have employed technique scheme, the utility model compared with prior art has following beneficial effect:
1, due to the oil circuit in tensioning pump station being provided with step-type flow control valve, the valve rod of flow control valve with abutted against by the ramped bottom surface of the swash plate of stepper motor driven rotary; When stepper motor drives swash plate stepping to rotate, by the stepping of swash plate rotate make valve rod drive the slow interval of spherical valve core on move or move down the size regulating filler opening opening, thus change hydraulic fluid flow rate size in oil circuit in real time, when the oil pressure value in oil circuit is close to stretch-draw setting oil pressure value, in PLC oil circuit control, hydraulic fluid flow rate is small flow, therefore effectively ensure precision when reaching default stretch-draw oil pressure value, ensure that cable tensios control oil pressure MPa numerical control precision is ± 1.5%.
2, due to the oil circuit in tensioning pump station being provided with pressure-relief valve, and the valve rod of pressure-relief valve is through the center hole of proportion electro-magnet, and pressure transducer is provided with at the oil outlet place of pressure-relief valve, the force value of pressure-relief valve oil outlet can be responded to and transmit to pressure transducer in real time to PLC, PLC controls pressure-relief valve release according to this force value, when oil circuit needs release, PLC applies the voltage of setting to proportion electro-magnet, proportion electro-magnet produces corresponding electromagnetic field makes release valve rod stretch out corresponding length, spherical spool is driven to leave pressure-relief valve oil outlet certain distance, make oil circuit pressure release, thus by changing the voltage of proportion electro-magnet, the size of adjustable pressure-relief valve oil outlet opening, release speed speed can easily be adjusted, and it is controlled to make the high pressure of the prestressing force intelligent tensioning system being operated in ultrahigh pressure state unload the speed of putting, ensures jack use safety.
3, due to the oil circuit in tensioning pump station being provided with selector valve, when PLC NOP no operation, the filler opening of PLC control flow check adjustable valve is opened, and selector valve is operated in meta, oil pump hydraulic oil out gets back to fuel tank, without pressure in oil circuit by flow control valve and selector valve.When PLC sends operational order, selector valve is operated in left or right position, and the filler opening of PLC control flow check adjustable valve diminishes or closes, and now hydraulic oil is by the filler opening of selector valve to jack.When reaching setting pressure, pressure transducer signal transmission is to PLC, the filler opening of PLC control flow check adjustable valve is in open mode, oil pump hydraulic oil out gets back to fuel tank by flow control valve, oil circuit is without pressure, and selector valve is operated in meta simultaneously, gets back to original state, thus avoid tensioning system and be operated in high pressure conditions, rate of fault reduces greatly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model embodiment.
Fig. 2 is the hydraulic schematic diagram of the utility model embodiment tensioning pump station.
Fig. 3 is the utility model embodiment flow control valve structure schematic diagram.
Fig. 4 is the utility model embodiment pressure-relief valve structural representation.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail:
Embodiment 1:
Prestressing force pull system as shown in Figure 1, include the main pumping station controlled by PLC I (programmable controller) and the auxiliary pump station controlled by PLC II, PLC I is connected with upper-position unit and wireless data transfer module I, PLC II is connected with wireless data transfer module II, main pumping station and auxiliary pump station are connected with the jack performing respective pumping plant action respectively, jack are provided with the displacement transducer detecting jack piston extrusion, main pumping station and auxiliary pump station are all tensioning pump stations as shown in Figure 2, this tensioning pump station includes the oil pump 5 driven by motor 6, flow control valve 4, selector valve 3 and pressure-relief valve 2, wherein the filler opening of oil pump 5 is connected on fuel tank by filter 7, the oil outlet 5a of oil pump 5 is connected with the second hydraulic fluid port 3b of selector valve 3 with the filler opening 4a of flow control valve 4, 3rd hydraulic fluid port 3c of selector valve 3 is connected with pressure-relief valve filler opening 2a, pressure-relief valve oil outlet 2b is connected with the filler opening 1a of jack 1, the oil outlet 1b of jack 1 is connected with the 4th hydraulic fluid port 3d of selector valve 3, first hydraulic fluid port 3a of selector valve 3 is connected with fuel tank respectively with the oil outlet 4b of flow control valve 4, flow control valve, the selector valve port corresponding to PLC respectively with the control end of pressure-relief valve is connected, the oil outlet place of pressure-relief valve 2 is provided with the pressure transducer be connected with described PLC.Step-type flow control valve 4 as shown in Figure 3 includes the valve body 45 be arranged on valve seat 47, valve seat 47 offers filler opening 4a, valve body 45 offers oil outlet 4b, vertical up big and down small and the uuper valve chamber be communicated with and lower valve chamber is offered in valve body 45, uuper valve chamber communicates with oil outlet 4b, in uuper valve chamber, be provided with spherical valve core 44, be connected with the valve rod 43 stretching out uuper valve chamber at spherical valve core 44 top; One stepper motor 41 is housed above the uuper valve chamber of valve body 45, the output shaft 411 of stepper motor 41 is coated with a swash plate 42, the bottom surface of this swash plate 42 and substantially horizontal angularly θ are arranged, and the bottom surface of the swash plate 42 of the present embodiment and the angle theta of substantially horizontal are 3 °; Valve rod 43 is arranged in offset distance with output shaft 411, and valve rod 43 is abutted against by the bottom surface of its top and swash plate 42; The lower valve chamber of valve body 45 communicates with filler opening 4a, is provided with spring 46 at the lower valve chamber of valve body 45 between the filler opening 4a joint and spherical valve core 44 of valve seat 47.Pressure-relief valve 2 as shown in Figure 4 comprises the release valve seat 27 and the release valve body 26 be set in turn on release valve seat 27 and proportion electro-magnet 21 that offer pressure-relief valve oil outlet 2b, in release valve body 26, offer the up-small and down-big and upper release valve pocket be communicated with and lower release valve pocket and the pressure-relief valve filler opening 2a that communicates with upper release valve pocket, the lower release valve pocket of release valve body 26 communicates with the pressure-relief valve oil outlet 2b of release valve seat 27; In lower release valve pocket, be provided with spherical spool 24, at the lower release valve pocket of release valve body 26 and between the pressure-relief valve oil outlet 2b joint of release valve seat 27 and spherical spool 24, spring 25 be installed; The release valve rod 22 that the upper release valve pocket stretching out release valve body 26 also passes proportion electro-magnet 21 core bore is connected with at spherical spool 24 top.
During work, upper-position unit sends instruction to PLC I, this operational order is explained and is passed through the data informations such as pressure, displacement, working state and controls main pumping station by PLC I, these data informations are sent to wireless data transfer module II by wireless data transfer module I by PLC I simultaneously, these data informations received are passed to PLC II by wireless data transfer module II, PLC II controls auxiliary pump station and main pumping station simultaneous tension according to these data informations, and feeds back the information of auxiliary pump station working state to PLC I by wireless data transfer module II simultaneously;
Wherein: during NOP no operation, tensioning pump station is in original state, and oil pump hydraulic oil out gets back to fuel tank by flow control valve and selector valve, oil circuit without pressure, jack attonity;
When upper-position unit sends tension operation instruction, selector valve is operated in left position, the filler opening of PLC control flow check adjustable valve diminishes or closes, now hydraulic oil is by the filler opening of selector valve to jack, jack piston stretches out, the length that in this process, piston stretches out is responded to by displacement transducer and is transmitted and feeds back signal to PLC, the pressure transducer be simultaneously arranged in flow control valve is responded to and is transmitted its valve internal pressure signal to PLC, this two signal constantly calculates and compares by PLC, when system internal pressure value reaches setup pressure value, the filler opening of PLC control flow check adjustable valve is in open mode, oil pump hydraulic oil out gets back to fuel tank by flow control valve, oil circuit is without pressure, meta got back to by selector valve simultaneously, pressure release oil outlet blocks by the steel ball now in pressure-relief valve, hydraulic oil is made not to be back to fuel tank, enter packing state, after the dwell time arrives, PLC controls release valve rod and the steel ball in pressure-relief valve is backed down certain distance, and the hydraulic oil of jack filler opening passes through slowly pressure-relief valve, fuel tank got back to by selector valve, completes release, when upper-position unit sends backhaul operation instruction, selector valve is operated in right position, and the filler opening of flow control valve is closed, the hydraulic fluid port standard-sized sheet of pressure-relief valve, and oil pump hydraulic oil out passes through selector valve, pressure-relief valve, and jack, gets back to fuel tank, jack piston backhaul, when jack piston backhaul is to the position set, completes single tension process.
Embodiment 2:
The bottom surface of swash plate 42 and the angle theta of substantially horizontal are 7 °; Other features are identical with embodiment 1.
Claims (5)
1. a prestressing force pull system, comprise the tensioning pump station controlled by PLC, described tensioning pump station is connected with jack (1), described tensioning pump station comprises the oil pump (5) being connected with motor (6), it is characterized in that: the oil pipe between the oil outlet (5a) of described oil pump (5) and the filler opening (1a) of described jack (1) is connected with step-type flow control valve (4), selector valve (3) and pressure-relief valve (2) in turn; The oil outlet place of described pressure-relief valve (2) is provided with the pressure transducer be connected with described PLC.
2. prestressing force pull system according to claim 1, it is characterized in that: described flow control valve (4) comprises the valve seat (47) offering filler opening (4a) and the valve body (45) be arranged on described valve seat, offer the up big and down small and uuper valve chamber be communicated with and lower valve chamber and the oil outlet (4b) that communicates with described uuper valve chamber in described valve body (45), described lower valve chamber communicates with described filler opening (4a); In described uuper valve chamber, be provided with spherical valve core (44), described spherical valve core (44) top is provided with the valve rod (43) stretching out described uuper valve chamber; Be provided with bottom surface on the output shaft (411) being installed on stepper motor (41) and substantially horizontal angularly (θ) swash plate (42) of arranging in the top of the described uuper valve chamber of described valve body (45), described valve rod (43) and described output shaft (411) are arranged in offset distance and are abutted against by the top of described valve rod (43) and the bottom surface of described swash plate (42); Described lower valve chamber is provided with spring (46) between filler opening (4a) joint and described spherical valve core (44) of described valve seat (47).
3. prestressing force pull system according to claim 2, is characterized in that: the bottom surface of described swash plate (42) and the angle (θ) of substantially horizontal are 3 ° ~ 7 °.
4. the prestressing force pull system according to claim 1 or 2 or 3, it is characterized in that: described pressure-relief valve (2) comprises the release valve seat (27) offering pressure-relief valve oil outlet (2b) and the release valve body (26) be set in turn on described release valve seat (27) and proportion electro-magnet (21), offer the up-small and down-big and upper release valve pocket be communicated with and lower release valve pocket and the pressure-relief valve filler opening (2a) that communicates with described upper release valve pocket in described release valve body (26), described lower release valve pocket communicates with described pressure-relief valve oil outlet (2b); In described lower release valve pocket, be provided with spherical spool (24), described lower release valve pocket is provided with spring (25) between pressure-relief valve oil outlet (2b) joint and described spherical spool (24) of described release valve seat (27); Described spherical spool (24) top is provided with stretches out described upper release valve pocket and the release valve rod (22) passing described proportion electro-magnet (21) center hole.
5. prestressing force pull system according to claim 4, it is characterized in that: the oil outlet (5a) of described oil pump (5) is connected with second hydraulic fluid port (3b) of described selector valve (3) with the filler opening (4a) of described flow control valve (4), 3rd hydraulic fluid port (3c) of described selector valve (3) is connected with described pressure-relief valve (2) filler opening (2a), described pressure-relief valve (2) oil outlet (2b) is connected with the filler opening (1a) of described jack (1), the oil outlet (1b) of described jack (1) is connected with the 4th hydraulic fluid port (3d) of described selector valve (3), first hydraulic fluid port (3a) of described selector valve (3) is connected with fuel tank respectively with the oil outlet (4b) of described flow control valve (4), described flow control valve (4), selector valve (3) port corresponding to described PLC respectively with the control end of pressure-relief valve (2) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420606793.7U CN204267402U (en) | 2014-10-18 | 2014-10-18 | Prestressing force pull system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420606793.7U CN204267402U (en) | 2014-10-18 | 2014-10-18 | Prestressing force pull system |
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| Publication Number | Publication Date |
|---|---|
| CN204267402U true CN204267402U (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420606793.7U Expired - Fee Related CN204267402U (en) | 2014-10-18 | 2014-10-18 | Prestressing force pull system |
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| CN (1) | CN204267402U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329309A (en) * | 2014-10-18 | 2015-02-04 | 柳州东迎预应力技术有限公司 | Prestressed tensioning system |
-
2014
- 2014-10-18 CN CN201420606793.7U patent/CN204267402U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329309A (en) * | 2014-10-18 | 2015-02-04 | 柳州东迎预应力技术有限公司 | Prestressed tensioning system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 Termination date: 20161018 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |