CN201099596Y - Constant tension small retracting prestressing force cable stretched hoisting jack - Google Patents
Constant tension small retracting prestressing force cable stretched hoisting jack Download PDFInfo
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- CN201099596Y CN201099596Y CNU2007201543763U CN200720154376U CN201099596Y CN 201099596 Y CN201099596 Y CN 201099596Y CN U2007201543763 U CNU2007201543763 U CN U2007201543763U CN 200720154376 U CN200720154376 U CN 200720154376U CN 201099596 Y CN201099596 Y CN 201099596Y
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Abstract
A constant tension small contraction prestress steel stranded wire tension jack is characterized in that a tension piston is shaped as a step cylinder, whose large diameter end excircle is engaged with the large diameter inner hole of the cylinder in a dynamic sealing way, the small diameter end excircle is engaged with the small diameter inner hole of the cylinder in a dynamic sealing way, and the piston is provided with a step round hole, the small diameter round hole is engaged with the excircle of a hollow round tube at the center of a cylinder cover in a dynamic sealing way at one side of the large diameter excircle end, the large diameter round hole is at one side of the small diameter excircle, whose port is provided with an internal screw fixed with the external screw of a sleeve gasket, the large diameter excircle end is communicated with the end face in the large diameter round hole via an overflow valve and a one-way valve, whose wall is provided with an oil duct. The overflow pressure of the overflow valve can be set to keep constant prestress on steel stranded wire and completely lock steel stranded wire via anchor wedge without affecting respect prestress to reduce the contracvtion caused by unloading the tension jack most.
Description
One, technical field
The utility model relates to the little retraction prestress wire of a kind of permanent tension force stretch-draw jack, and it belongs to the hydraulic tools technical field.
Two, background technology
Prestress wire is widely used in the roadway support engineering of building, road and bridge and mining, at present the prestress wire stretch-draw jack that uses exists following defective: 1, to the roof pressure power deficiency of anchor chock, after the jack off-load, because anchor chock is not enough to the bond stress of steel strand, the huge internal stress of steel strand will spur anchor chock and produce bigger displacement make by the steel strand of stretch-draw and bounce back in the anchor cup, thereby prestress is reduced greatly, used the method for opening still can not get a desired effect sometimes.2, some prestress wire stretch-draw jack is provided with the oil cylinder of roof pressure anchor chock at front end, but the oil cylinder of roof pressure anchor chock is directly to be communicated with the oil cylinder of stretch-draw jack, when therefore the stretching force of the oil cylinder of stretch-draw jack reaches the power of the oil cylinder motion that can make the roof pressure anchor chock, anchor chock just begins the wedging steel strand, because the conical surface in the anchor cup and the angle of steel strand axis are very little, anchor chock is very fast just locked with steel strand to the bond stress of steel strand, can not carry out stretch-draw although increase the stretching force of the oil cylinder of stretch-draw jack again to the active component of steel strand yet, after this stretching force all is applied to ground tackle to the invalid section between the work anchor, can not make steel strand obtain enough prestress like this.
Three, summary of the invention
For solving the defective that pre existing stress steel strand tension jack exists, the utility model provides the little retraction prestress wire of a kind of permanent tension force stretch-draw jack, the utility model is provided with a stretch-draw oil cylinder and a top wedge oil cylinder, between the epitrochoidal chamber of the epitrochoidal chamber of stretch-draw oil cylinder and top wedge oil cylinder, be provided with a by pass valve and a check valve, can solve effectively like this at prestress wire and apply the rebound phenomenon of prestress process and anchor chock locked problem too early.
The technical solution adopted in the utility model is: the little retraction prestress wire of a kind of permanent tension force stretch-draw jack, comprise cylinder cap (1), check valve (2), stretch-draw piston (3), top wedge piston (4), cylinder body (5), spacer (6), top wedge head (7), tensioning head (8), hydraulic fluid port B (9), C chamber (10), D chamber (11), oil duct (12), B chamber (13), by pass valve (14), hydraulic fluid port A (15), A chamber (16) etc., it is characterized in that: the stepped cylinder of stretch-draw piston profile, the larger diameter end cylindrical is dynamic seal with the cylinder body larger diameter internal bore and cooperates, the smaller diameter end cylindrical is dynamic seal with cylinder body minor diameter endoporus and cooperates, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and the spacer outside thread is connected outside minor diameter, the interior end face of the outer nose circle end face of its major diameter and major diameter circular hole is communicated with by by pass valve and check valve, and its tube wall is provided with oil duct; The stepped cylinder of top wedge piston profile, the larger diameter end cylindrical is dynamic seal with the interior major diameter circular hole of stretch-draw piston and cooperates, the smaller diameter end cylindrical is dynamic seal with the spacer endoporus and cooperates, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and top wedge head outside thread is connected outside minor diameter; The cylinder body profile is and is provided with stepped circular hole in the cylinder, and the outside thread that the larger diameter internal bore port is provided with negative thread and cylinder cap is connected, and the face of cylinder is provided with hydraulic fluid port A and hydraulic fluid port B and passes cylinder wall; Cylinder cap one end is in the form of annular discs and be provided with a hollow circular-tube, and disk is provided with outside thread outward; The tensioning head profile is and is provided with stepped circular hole in the cylinder, and major diameter circular hole end is provided with negative thread and the spacer outside thread is connected; The stepped cylinder of top wedge head profile, an end are provided with outside thread and wedge piston one end negative thread in top is connected, in be provided with centre hole; Spacer is a hollow tubular, and an end is provided with outside thread and is connected mutually with stretch-draw piston and tensioning head.
The utility model is at hydraulic fluid port A injection pressure hydraulic oil, during hydraulic fluid port B connected tank, pressure hydraulic oil at first enters by cylinder cap, the stretch-draw piston is moved on beginning, and withstand the anchor cup by tensioning head, after the anchor cup is by dieback, cylinder cap makes steel strand begin tensioning downward dieback work anchor together with cylinder body and produces stress, continuing injection pressure hydraulic oil system pressure can raise along with the increase of steel strand stress and strain, when system pressure is elevated to force value that by pass valve sets or steel strand and has reached required prestress value, by pass valve begins to by the stretch-draw piston, overflow in the B chamber that cylinder cap and top wedge piston form, this moment, top wedge piston moved on beginning, and it is locked steel strand fully until anchor chock by top wedge head anchor chock to be headed into the anchor cup, because the existence of by pass valve, oil pressure in the A chamber can remain on the pressure that by pass valve sets, therefore the prestress value of steel strand can keep constant, and the top wedge power the during wedge of top can lean on the displacement of top wedge piston to control.When the prestress of steel strand apply finish after at hydraulic fluid port B injection pressure hydraulic oil, during hydraulic fluid port A connected tank, pressure hydraulic oil will at first enter in the C chamber that is formed by cylinder body and stretch-draw piston, make the stretch-draw piston begin to move down, and enter the D chamber that forms with spacer by oil duct by stretch-draw piston, top wedge piston, the B intraluminal fluid press oil by check valve enter the A chamber through hydraulic fluid port A oil sump tank until stretch-draw piston and top wedge piston reset.
The beneficial effects of the utility model are: solve the defective that pre existing stress steel strand tension jack exists, make the prestress that steel strand are applied keep constant by the oil pressure relief of setting by pass valve, under the situation of the prestress value that does not influence expection, make anchor chock that steel strand are locked fully, the retraction that causes because of the off-load of stretch-draw jack is reduced to minimum.
Four, description of drawings
Fig. 1 is a constructional drawing of the present utility model
Fig. 2 is a use constructional drawing of the present utility model
Five, the specific embodiment
With reference to Fig. 1, shown in Figure 2, the little retraction prestress wire of a kind of permanent tension force stretch-draw jack comprises that cylinder cap (1), check valve (2), stretch-draw piston (3), top wedge piston (4), cylinder body (5), spacer (6), top wedge head (7), tensioning head (8), hydraulic fluid port B (9), C chamber (10), D chamber (11), oil duct (12), B chamber (13), by pass valve (14), hydraulic fluid port A (15), A chamber (16) etc. constitute.The stepped cylinder of stretch-draw piston (3) profile, the larger diameter end cylindrical is dynamic seal and cooperates with cylinder body (5) larger diameter internal bore, the smaller diameter end cylindrical is dynamic seal with cylinder body (5) minor diameter endoporus and cooperates, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap (1) center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and spacer (6) outside thread is connected outside minor diameter, the interior end face of the outer nose circle end face of its major diameter and major diameter circular hole is communicated with by by pass valve (14) and check valve (2), and its tube wall is provided with oil duct (12); The stepped cylinder of top wedge piston (4) profile, the larger diameter end cylindrical is dynamic seal with the interior major diameter circular hole of stretch-draw piston (3) and cooperates, the smaller diameter end cylindrical is dynamic seal and cooperates with spacer (6) endoporus, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap (1) center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and top wedge head (7) outside thread is connected outside minor diameter; Cylinder body (5) profile is and is provided with stepped circular hole in the cylinder, and the outside thread that the larger diameter internal bore port is provided with negative thread and cylinder cap (1) is connected, and the face of cylinder is provided with hydraulic fluid port A (15) and hydraulic fluid port B (9) and passes cylinder body (5) wall; Cylinder cap (1) one end is in the form of annular discs and be provided with a hollow circular-tube, and disk is provided with outside thread outward; Tensioning head (8) profile is and is provided with stepped circular hole in the cylinder, and major diameter circular hole end is provided with negative thread and spacer (6) outside thread is connected; The stepped cylinder of top wedge head (7) profile, an end are provided with outside thread and wedge piston (4) one end negative threads in top are connected, in be provided with centre hole; Spacer (6) is a hollow tubular, and an end is provided with outside thread and is connected mutually with stretch-draw piston (3) and tensioning head (8).
The utility model is at hydraulic fluid port A (15) injection pressure hydraulic oil, during hydraulic fluid port B (9) connected tank, pressure hydraulic oil at first enters by cylinder cap (1), stretch-draw piston (3) is moved on beginning, and withstand the anchor cup by tensioning head (8), after the anchor cup is by dieback, cylinder cap (1) makes steel strand begin tensioning downward dieback work anchor together with cylinder body (5) and produces stress, continuing injection pressure hydraulic oil system pressure can raise along with the increase of steel strand stress and strain, when system pressure is elevated to force value that by pass valve (14) sets or steel strand and has reached required prestress value, by pass valve (14) beginning is to by stretch-draw piston (3), the interior overflow in B chamber (13) that cylinder cap (1) and top wedge piston (4) form, on beginning, moves in top wedge piston this moment (4), and it is locked steel strand fully until anchor chock by top wedge head (7) anchor chock to be headed into the anchor cup, because the existence of by pass valve (14), oil pressure in the A chamber (16) can remain on the pressure that by pass valve (14) sets, therefore the prestress value of steel strand can keep constant, and the top wedge power the during wedge of top can lean on the displacement of top wedge piston (4) to control.When the prestress of steel strand apply finish after at hydraulic fluid port B (9) injection pressure hydraulic oil, during hydraulic fluid port A (15) connected tank, pressure hydraulic oil will at first enter in the C chamber (10) that is formed by cylinder body (5) and stretch-draw piston (3), make stretch-draw piston (3) begin to move down, and entering the D chamber (11) that forms by stretch-draw piston (3), top wedge piston (4) and spacer (6) by oil duct (12), the interior hydraulic oil in B chamber (13) enters A chamber (16) by check valve (2) and resets until stretch-draw piston (3) and top wedge piston (4) through hydraulic fluid port A (15) oil sump tank.
Claims (2)
1. the little retraction prestress wire of a permanent tension force stretch-draw jack comprises cylinder cap, check valve, the stretch-draw piston, top wedge piston, cylinder body, spacer, top wedge head, tensioning head, hydraulic fluid port B, the C chamber, the D chamber, oil duct, the B chamber, by pass valve, hydraulic fluid port A, the A chamber, it is characterized in that: the stepped cylinder of stretch-draw piston profile, the larger diameter end cylindrical is dynamic seal with the cylinder body larger diameter internal bore and cooperates, the smaller diameter end cylindrical is dynamic seal with cylinder body minor diameter endoporus and cooperates, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and the spacer outside thread is connected outside minor diameter, the interior end face of the outer nose circle end face of its major diameter and major diameter circular hole is communicated with by by pass valve and check valve, and its tube wall is provided with oil duct.
2. the little retraction prestress wire of a kind of permanent tension force according to claim 1 stretch-draw jack, it is characterized in that: the stepped cylinder of top wedge piston profile, the larger diameter end cylindrical is dynamic seal with the interior major diameter circular hole of stretch-draw piston and cooperates, the smaller diameter end cylindrical is dynamic seal with the spacer endoporus and cooperates, be provided with stepped circular hole in it, minor diameter circular hole nose circle one side outside major diameter is dynamic seal with the hollow circular-tube cylindrical at cylinder cap center and cooperates, major diameter circular hole nose circle one side and port is provided with negative thread and top wedge head outside thread is connected outside minor diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201543763U CN201099596Y (en) | 2007-05-21 | 2007-05-21 | Constant tension small retracting prestressing force cable stretched hoisting jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201543763U CN201099596Y (en) | 2007-05-21 | 2007-05-21 | Constant tension small retracting prestressing force cable stretched hoisting jack |
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| Publication Number | Publication Date |
|---|---|
| CN201099596Y true CN201099596Y (en) | 2008-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201543763U Expired - Fee Related CN201099596Y (en) | 2007-05-21 | 2007-05-21 | Constant tension small retracting prestressing force cable stretched hoisting jack |
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| CN (1) | CN201099596Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826481A (en) * | 2012-09-06 | 2012-12-19 | 四川盛堡机电科技有限责任公司 | Ultrahigh-pressure powerful jack |
| CN103232006A (en) * | 2013-05-13 | 2013-08-07 | 蔡青林 | Jack for anchor rod tension meter |
| CN103291929A (en) * | 2013-06-03 | 2013-09-11 | 常熟市藕渠针织机械厂 | Oil room seal device used for oil pressure tool |
| CN104136784A (en) * | 2012-02-28 | 2014-11-05 | 无限设备有限公司 | Locking extension device |
| CN104594929A (en) * | 2014-12-31 | 2015-05-06 | 中国矿业大学 | Constant-resistance middle connection device of anchor rope |
| CN107654443A (en) * | 2017-08-28 | 2018-02-02 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic makes concentric mechanism by oneself |
-
2007
- 2007-05-21 CN CNU2007201543763U patent/CN201099596Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104136784A (en) * | 2012-02-28 | 2014-11-05 | 无限设备有限公司 | Locking extension device |
| CN104136784B (en) * | 2012-02-28 | 2017-05-10 | 无限设备有限公司 | locking extension device |
| CN102826481A (en) * | 2012-09-06 | 2012-12-19 | 四川盛堡机电科技有限责任公司 | Ultrahigh-pressure powerful jack |
| CN103232006A (en) * | 2013-05-13 | 2013-08-07 | 蔡青林 | Jack for anchor rod tension meter |
| CN103291929A (en) * | 2013-06-03 | 2013-09-11 | 常熟市藕渠针织机械厂 | Oil room seal device used for oil pressure tool |
| CN103291929B (en) * | 2013-06-03 | 2015-08-26 | 太仓兴锋脚轮有限公司 | For grease chamber's seal arrangement of oil pressure tool |
| CN104594929A (en) * | 2014-12-31 | 2015-05-06 | 中国矿业大学 | Constant-resistance middle connection device of anchor rope |
| CN107654443A (en) * | 2017-08-28 | 2018-02-02 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic makes concentric mechanism by oneself |
| CN107654443B (en) * | 2017-08-28 | 2024-02-06 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic self-centering mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hebei blue Mine Equipment Co., Ltd. Assignor: Shao Peisen Contract fulfillment period: 2009.11.28 to 2014.11.27 Contract record no.: 2009990001334 Denomination of utility model: Constant tension small retracting prestressing force cable stretched hoisting jack Granted publication date: 20080813 License type: Exclusive license Record date: 20091225 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.11.28 TO 2014.11.27; CHANGE OF CONTRACT Name of requester: HEBEI LANCHANG MINE EQUIPMENT CO., LTD. Effective date: 20091225 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080813 Termination date: 20100521 |