CN204339693U - Rotor flowmeter assembly and disassembly tools - Google Patents

Abstract

The utility model provides a rotor flow meter assembly and disassembly tools. This rotor flow meter assembly and disassembly tools includes: a cross beam; the connecting assembly comprises a positioning rod, the positioning rod is connected to the cross beam, and an external thread matched with a threaded hole in an upper flow distribution box of the rotor flow meter is arranged on the positioning rod; the driving assembly comprises a sliding sleeve, a supporting rod and an adjusting piece, wherein the sliding sleeve is connected to the cross beam and is perpendicular to the cross beam, and the central axis of the sliding sleeve is parallel to the central axis of the positioning rod; the first end of the supporting rod is arranged in the sliding sleeve; the adjusting piece moves along the length direction of the supporting rod to drive the sliding sleeve to move along the length direction of the supporting rod. The utility model discloses a rotor flow meter assembly and disassembly tools simple structure, light in weight, small have adopted the screw drive principle, operate laborsaving, convenient very much, and safety in the operation is steady, does not have the impact force in the operation, more does not have the phenomenon that causes part damage and personnel injured and takes place.

Description

Spinner flowmeter dismantling device

Technical field

The utility model relates to flowmeter dismantling device technical field, in particular to a kind of spinner flowmeter dismantling device.

Background technology

Spinner flowmeter is made up of two parts, and spinner flowmeter one is the conical pipe expanded gradually from bottom to top; Another part of spinner flowmeter is placed in conical pipe and can along the rotor of the center line of pipe freely up and down movement.Spinner flowmeter is when measuring the flow of fluid, and detected fluid flows into from conical pipe lower end, and the impact flow of fluid rotor, and produces an active force (size of this power changes with uninterrupted) to it; When flow is enough large, the active force produced by rotor picking-up, and makes it to raise.Meanwhile, detected fluid flows through the annular section between rotor and taper tube wall, and at this moment acting on epitrochanterian power has three: fluid is to the dynamic pressure of rotor, rotor buoyancy in a fluid and the gravity of rotor self.During flowmeter at right angle setting, rotor c.g. and Taper Pipe tubular axis can coincide, and act on epitrochanterian three power all along the direction being parallel to tubular axis.When these three power reach balance, rotor just to float in Taper Pipe on a certain position reposefully.For given spinner flowmeter, rotor size and shape oneself through determining, therefore its buoyancy in a fluid and self gravitation are all known is constant, has fluid only and changes the size of the dynamic pressure of float with incoming flow flow velocity.Therefore when incoming flow flow velocity becomes large or when diminishing, rotor will do movement up or down, and the flow section of relevant position also changes, until speed corresponding when flow velocity becomes balance, rotor is just stablized on new position.For a given spinner flowmeter, the size that the position of rotor in Taper Pipe and fluid flow through the flow of Taper Pipe becomes one-to-one relationship.

Tube wall is not being encountered when the center line of conical pipe moves up and down in order to make rotor, usual employing two kinds of methods: one is that the heart is equipped with a guiding plug in the rotor, move up and down at the center line of conical pipe to keep rotor, another kind has a lot of skewed slot at rotor discs edge, when fluid flows through rotor from bottom to top, one side walks around rotor, produces a propulsive thrust again through skewed slot simultaneously, rotor about central line is ceaselessly rotated, just can keep that rotor is operationally unlikely encounters tube wall.The rotor material of spinner flowmeter can be made with stainless steel, aluminium, bronze etc.

Spinner flowmeter is widely used in the defeated and chemical industry of crude oil collection, it is special that the axial flow branch mailbox of spinner flowmeter connects shape, and the gap between housing is very little, dismounting bothers, when keeping in repair at ordinary times, personnel at least want 4 people, need 3 hours consuming time, because there is no specific purpose tool, usual employing is raw prizes mode dismounting not firmly, the center magnetic biasing shaft distortion cause flowmeter axial flow branch mailbox to degenerate with housing fit clearance, being connected with instrument becomes bent, the even assembly that ruptures is scrapped, and not only impact collects normally carrying out of defeated gage work.And cause the increase of Master Cost, in maintenance process, often because of people firmly time disequilibrium or the excessive and gouge of limbs amplitude of fluctuation, slide into.

Utility model content

Main purpose of the present utility model is to provide a kind of spinner flowmeter dismantling device of being convenient to carry out spinner flowmeter dismounting.

To achieve these goals, the utility model provides a kind of spinner flowmeter dismantling device, comprising: crossbeam; Coupling assembling, coupling assembling comprises backstay, and backstay is connected on crossbeam, backstay is provided with the external screw thread suitable with the screwed hole on the upper current divider box of spinner flowmeter; Driven unit, driven unit comprises sliding sleeve, support bar and regulating part, and wherein, sliding sleeve to be connected on crossbeam and perpendicular to crossbeam, and the central axis of sliding sleeve and backstay centerline axis parallel; The first end of support bar is arranged in sliding sleeve; Regulating part moves to drive sliding sleeve to move along the length direction of support bar along the length direction of support bar.

Further, one end away from sliding sleeve of support bar is provided with square.

Further, support bar is provided with external screw thread, regulating part is the adjusting nut be set on support bar.

Further, support bar is provided with external screw thread; Sliding sleeve is provided with shoulder hole, and larger one end, the aperture of shoulder hole is near regulating part, and one end that the aperture of shoulder hole is less is provided with the internal thread coordinated with the external screw thread on support bar.

Further, the two ends of crossbeam all arrange anti-drop assembly.

Further, the two ends of crossbeam are provided with thread segment, and anti-drop assembly comprises and is removably set in screwed retaining ring on thread segment and anti-dropping gasket.

Further, spinner flowmeter dismantling device also comprises: fixture ring of adjustable, and fixture ring of adjustable is set on crossbeam, and fixture ring of adjustable is fixedly installed connecting rod, and backstay is removably fixed on fixture ring of adjustable by connecting rod.

Further, spinner flowmeter dismantling device also comprises: connecting ring, and connecting ring is set on crossbeam, and sliding sleeve is fixedly connected on connecting ring.

Further, driven unit is two, and two driven units are arranged on the both sides of coupling assembling.

Further, backstay is two.

Application the technical solution of the utility model, according to the structure of spinner flowmeter of the present utility model, in the process of dismounting spinner flowmeter, first by the effect of coupling assembling, external screw thread on backstay is coordinated with the screwed hole on the upper current divider box of the eccentric rotor of spinner flowmeter, and then backstay is fixed on the upper current divider box of eccentric rotor flowmeter.Then the support bar of driven unit is fixed, now, only need to drive regulating part to move along the direction of support bar away from ground, and then drive crossbeam to move along the direction away from ground, and then drive backstay the upper current divider box of spinner flowmeter can be disassembled from spinner flowmeter to the direction motion away from ground.When needing the upper branch mailbox of spinner flowmeter to be installed in spinner flowmeter main body, then oppositely regulate regulating part, moved to the direction near ground by backstay upper reaches branch mailbox of slinging, current divider box is fallen behind the center of then slowly centering spinner flowmeter main body, and then the centering realizing spinner flowmeter is installed, workman's number that whole process consumes is few, and dismounting engineering safety is convenient, and hand labor intensity is low.Dismantling device structure of the present utility model is simple, lightweight, volume is little.Peripheral space can be carried out little, there are dismounting and the centering of the parts of screw in both sides symmetry or center, maintainable adaptation part dimension scope is large, have employed worm drive principle, it is laborsaving especially, convenient to operate, safety in operation, steadily, impulsive force is not had, more without causing the phenomenon of parts damages and injury to personnel to occur in operation.

Accompanying drawing explanation

The Figure of description forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 diagrammatically illustrates the front view of spinner flowmeter dismantling device of the present utility model.

Wherein, above-mentioned accompanying drawing comprises the following drawings mark:

11, crossbeam;

12, fixture ring of adjustable;

121, connecting rod;

13, connecting ring;

20, coupling assembling;

21, backstay;

30, driven unit;

31, sliding sleeve;

311, shoulder hole;

32, support bar;

33, regulating part;

40, square;

50, anti-drop assembly;

51, screwed retaining ring;

52, anti-dropping gasket.

Detailed description of the invention

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.

It is noted that following detailed description is all exemplary, be intended to provide further instruction to the application.Unless otherwise, all technology used herein and scientific terminology have the identical meanings usually understood with the application person of an ordinary skill in the technical field.

It should be noted that used term is only to describe detailed description of the invention here, and be not intended to the illustrative embodiments of restricted root according to the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative is also intended to comprise plural form, in addition, it is to be further understood that, " comprise " when using term in this manual and/or " comprising " time, it indicates existing characteristics, step, operation, device, assembly and/or their combination.

It should be noted that, term " first ", " second " etc. in the description of the application and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as the embodiment example of the application described herein if with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.

For convenience of description, here can usage space relative terms, as " ... on ", " in ... top ", " at ... upper surface ", " above " etc., be used for the spatial relation described as a device shown in the figure or feature and other devices or feature.Should be understood that, space relative terms is intended to comprise the different azimuth in use or operation except the described in the drawings orientation of device.Such as, " in other devices or structure below " or " under other devices or structure " will be positioned as after if the device in accompanying drawing is squeezed, being then described as the device of " above other devices or structure " or " on other devices or structure ".Thus, exemplary term " in ... top " can comprise " in ... top " and " in ... below " two kinds of orientation.This device also can other different modes location (90-degree rotation or be in other orientation), and relatively describe space used here and make respective explanations.

Now, the illustrative embodiments according to the application is described with reference to the accompanying drawings in more detail.But these illustrative embodiments can be implemented by multiple different form, and should not be interpreted as being only limited to embodiment set forth herein.Should be understood that, provide these embodiments be in order to make the application open thorough and complete, and the design of these illustrative embodiments is fully conveyed to those of ordinary skill in the art.

As background technology is recorded, spinner flowmeter is widely used in the defeated and chemical industry of crude oil collection, it is special that the axial flow branch mailbox of spinner flowmeter connects shape, and the gap between housing is very little, dismounting bothers, when keeping in repair at ordinary times, personnel at least want 4 people, need 3 hours consuming time, because there is no specific purpose tool, usual employing is raw prizes mode dismounting not firmly, and the center magnetic biasing shaft distortion cause flowmeter upper reaches branch mailbox to degenerate with housing fit clearance, being connected with instrument becomes bent, the even assembly that ruptures is scrapped, and not only impact collects normally carrying out of defeated gage work.And cause the increase of Master Cost, in maintenance process, often because of people firmly time disequilibrium or the excessive and gouge of limbs amplitude of fluctuation, slide into.In order to solve the problems referred to above existed in background technology, the utility model provides a kind of spinner flowmeter dismantling device.

Embodiment 1

Shown in Figure 1, according to the first embodiment of the present utility model, provide a kind of spinner flowmeter dismantling device.This spinner flowmeter dismantling device comprises crossbeam 11, coupling assembling 20 and driven unit 30.

Coupling assembling 20 comprises backstay 21, and this backstay 21 is connected on crossbeam 11, backstay 21 is provided with the external screw thread suitable with the screwed hole on the upper current divider box of spinner flowmeter; Driven unit 30 comprises sliding sleeve 31, support bar 32 and regulating part 33.

Wherein, sliding sleeve 31 to be connected on crossbeam 11 and perpendicular to crossbeam 11, and the central axis of sliding sleeve 31 and backstay 21 centerline axis parallel; The first end of support bar 32 is arranged in sliding sleeve 31; Regulating part 33 moves to drive sliding sleeve 31 to move along the length direction of support bar 32 along the length direction of support bar 32.

According to the structure of the spinner flowmeter of the present embodiment, in the process of dismounting spinner flowmeter, first by the effect of coupling assembling 20, external screw thread on backstay 21 is coordinated with the screwed hole on the upper current divider box of the eccentric rotor of spinner flowmeter, and then backstay 21 is fixed on the upper current divider box of eccentric rotor flowmeter.Then the support bar 32 of driven unit 30 is fixed, now, only need to drive regulating part 33 to move along the direction of support bar 32 away from ground, and then drive crossbeam 11 to move along the direction away from ground, and then drive backstay 21 the upper current divider box of spinner flowmeter can be disassembled from spinner flowmeter to the direction motion away from ground.

When needing the upper branch mailbox of spinner flowmeter to be installed in spinner flowmeter main body, then oppositely regulate regulating part 33, moved to the direction near ground by backstay 21 upper reaches branch mailbox of slinging, current divider box is fallen behind the center of then slowly centering spinner flowmeter main body, and then the centering realizing spinner flowmeter is installed, workman's number that whole process consumes is few, and dismounting engineering safety is convenient, and hand labor intensity is low.

Dismantling device structure of the present utility model is simple, lightweight, volume is little.Peripheral space can be carried out little, there are dismounting and the centering of the parts of screw in both sides symmetry or center, maintainable adaptation part dimension scope is large, have employed worm drive principle, it is laborsaving especially, convenient to operate, safety in operation, steadily, impulsive force is not had, more without causing the phenomenon of parts damages and injury to personnel to occur in operation.

Embodiment 2

According to the second embodiment of the present utility model, provide a kind of spinner flowmeter dismantling device.Shown in Figure 1, according to the second embodiment of the present utility model, provide a kind of spinner flowmeter dismantling device.This spinner flowmeter dismantling device comprises crossbeam 11, coupling assembling 20 and driven unit 30.

Coupling assembling 20 comprises backstay 21, and this backstay 21 is connected on crossbeam 11, backstay 21 is provided with the external screw thread suitable with the screwed hole on the upper current divider box of spinner flowmeter; Driven unit 30 comprises sliding sleeve 31, support bar 32 and regulating part 33.

Wherein, sliding sleeve 31 to be connected on crossbeam 11 and perpendicular to crossbeam 11, and the central axis of sliding sleeve 31 and backstay 21 centerline axis parallel; The first end of support bar 32 is arranged in sliding sleeve 31; Regulating part 33 moves to drive sliding sleeve 31 to move along the length direction of support bar 32 along the length direction of support bar 32.

According to the structure of the spinner flowmeter of the present embodiment, in the process of dismounting spinner flowmeter, first by the effect of coupling assembling 20, external screw thread on backstay 21 is coordinated with the screwed hole on the upper current divider box of the eccentric rotor of spinner flowmeter, and then backstay 21 is fixed on the upper current divider box of eccentric rotor flowmeter.Then the support bar 32 of driven unit 30 is fixed, now, only need to drive regulating part 33 to move along the direction of support bar 32 away from ground, and then drive crossbeam 11 to move along the direction away from ground, and then drive backstay 21 the upper current divider box of spinner flowmeter can be disassembled from spinner flowmeter to the direction motion away from ground.

When needing the upper branch mailbox of spinner flowmeter to be installed in spinner flowmeter main body, then oppositely regulate regulating part 33, moved to the direction near ground by backstay 21 upper reaches branch mailbox of slinging, current divider box is fallen behind the center of then slowly centering spinner flowmeter main body, and then the centering realizing spinner flowmeter is installed, workman's number that whole process consumes is few, and dismounting engineering safety is convenient, and hand labor intensity is low.

Preferably, support bar 32 is provided with external screw thread, regulating part 33 is for being set in the adjusting nut on support bar 32.In the process of dismounting spinner flowmeter, adjusting nut moves up and down along the external screw thread of support bar 32, and then makes sliding sleeve 31 move up and down with dismounting spinner flowmeter along the length direction of support bar 32, and structure is simple, is convenient to realize.

Preferably, support bar 32 is provided with external screw thread; Sliding sleeve 31 is provided with shoulder hole 311, larger one end, the aperture of this shoulder hole 311 is near regulating part 33, and one end that the aperture of shoulder hole 311 is less is provided with the internal thread coordinated with the external screw thread on support bar 32.When in the process needing dismounting spinner flowmeter, support bar 32 is positioned at larger one end, the aperture of shoulder hole 311, and now, sliding sleeve 31 moves up and down with regulating part 33 and moves up and down; When not needing the timing of dismounting spinner, the one end fits that the aperture of support bar 32 upper end and shoulder hole 311 is less, prevents support bar 32 from departing from whole device and is not easy to carrying.

Preferably, one end away from sliding sleeve 31 of support bar 32 is provided with square 40, by the one end away from sliding sleeve 31 at support bar 32, square 40 is set, in disassembly process, contact area is large, be beneficial to and fixed by square 40 with spanner, and then prevent support bar 32 from rotating and affecting moving up and down of regulating part 33, structure is simple.

Preferably, spinner flowmeter dismantling device also comprises fixture ring of adjustable 12, and this fixture ring of adjustable 12 is set on crossbeam 11, fixture ring of adjustable 12 is fixedly installed connecting rod 121, and backstay 21 is removably fixed on fixture ring of adjustable 12 by connecting rod 121.More preferably, spinner flowmeter dismantling device also comprises connecting ring 13, and this connecting ring 13 is set on crossbeam 11, and sliding sleeve 31 is fixedly connected on connecting ring 13, and structure is simple, and intensity is high.

Preferably, the two ends of crossbeam 11 all arrange anti-drop assembly 50, are convenient to prevent to be set in fixture ring of adjustable 12 on crossbeam 11 and connecting ring 13 falls down from crossbeam 11.More preferably, the two ends of crossbeam 11 are provided with thread segment, and anti-drop assembly 50 comprises and is removably set in screwed retaining ring 51 on thread segment and anti-dropping gasket 52, and structure is simple, is convenient to realize.

Preferably, driven unit 30 is two, and two driven units 30 are arranged on the both sides of coupling assembling 20, and ensure carrying out smoothly of disassembly process, in other embodiments of the present utility model, driven unit 30 can also be set to two or more.

Preferably, backstay 21 is two, is convenient to coordinate with two screwed holes on current divider box on spinner flowmeter eccentric rotor, improves the stability in unloading process.

The dismounting SKZN single rotor flowmeter course of work illustrating the spinner flowmeter eccentric rotor dismantling device of the present embodiment below in conjunction with said structure is as follows:

The dismounting of 1.SKZN single rotor flowmeter:

During dismounting, perform the following step:

1) driven unit 30, connecting ring 13 and anti-drop assembly 50 are unloaded from crossbeam 11;

2) two connecting rods 121 are tightened respectively on the symmetrical screwed hole of on the upper current divider box of SKZN single rotor flowmeter to be torn open two;

3) rotating fixture ring of adjustable 12 makes its circular hole and crossbeam 11 keep on the same axis;

4) by driven unit 30 on spinner flowmeter housing outer, crossbeam 11 is put on anti-drop assembly 50 through a pair fixture ring of adjustable 12 and connecting ring 13;

5) with the square 40 of spanner stationary positioned bar 21 bottom;

6) upwards rotated by regulating part 33, jack-up sliding sleeve 31 drives connecting rod 121 to extract current divider box;

When centering is installed, after completing 1 to 5 steps, then connecting rod 121 is sling the upper current divider box of eccentric rotor, and rotates the upper current divider box that regulating part 33 centering center has fallen eccentric rotor, realizes centering installation.

2. pair only there is the enforcement dismounting of the parts of screw at center

Execution step is as follows:

1) driven unit 30, connecting ring 13 and anti-drop assembly 50 unload from crossbeam 11;

2) by tight for a connecting rod 121 screwed hole in the middle part of spinner flowmeter to be torn open;

3) rotating fixture ring of adjustable 12 makes its circular hole and crossbeam 11 keep on the same axis;

4) by two driven units 30 on the housing outer of spinner flowmeter, crossbeam 11 is put on anti-drop assembly 50 through a pair fixture ring of adjustable 12 and connecting ring 13;

5) crossbeam 11 is put on anti-dropping gasket 52 and screwed retaining ring 51 through fixture ring of adjustable 12 and connecting ring 13;

6) with the square 40 of spanner stationary positioned bar 21 bottom;

7) upwards rotated by regulating part 33, jack-up sliding sleeve 31 drives connecting rod 121 to extract the parts that will dismantle.

During installation, the regulating part 33 then slowly screwing off both sides after completing above-mentioned steps 1 to 6 after aligning parts realizes steady centering and installs.

As can be seen from the above description, the utility model the above embodiments achieve following technique effect:

This tool construction is simple, lightweight, volume is little.Peripheral space can be carried out little, there are dismounting and the centering of the parts of screw in both sides symmetry or center, owing to have employed the fixture ring of adjustable that can horizontally slip on crossbeam, the backstay being removably disposed in the connecting ring on crossbeam and can adjusting up and down, maintainable adaptation part dimension scope is large, and owing to have employed worm drive principle, it is laborsaving especially, convenient to operate, safety in operation, steadily, in operation, there is no impulsive force, more without causing the phenomenon of parts damages and injury to personnel to occur.

Instrument of the present utility model is lightweight easy to carry, and volume is little, handy flexibly, keeps in repair a flowmeter and is kept to 2 present people by 4 people in past, and disassembly and assembly time was down to present average 1 hour for average 3 hours by the past.While the difficult problem solving flowmeter maintenance, shorten equipment downtime, improve equipment utilization timeliness.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (10)

1. a spinner flowmeter dismantling device, is characterized in that, comprising:

Crossbeam (11);

Coupling assembling (20), described coupling assembling (20) comprises backstay (21), described backstay (21) is connected on described crossbeam (11), and described backstay (21) is provided with the external screw thread suitable with the screwed hole on the upper current divider box of spinner flowmeter;

Driven unit (30), described driven unit (30) comprises sliding sleeve (31), support bar (32) and regulating part (33), wherein,

It is upper and perpendicular to described crossbeam (11) that described sliding sleeve (31) is connected to described crossbeam (11), and the central axis of described sliding sleeve (31) and described backstay (21) centerline axis parallel;

The first end of described support bar (32) is arranged in described sliding sleeve (31);

Described regulating part (33) moves to drive described sliding sleeve (31) to move along the length direction of described support bar (32) along the length direction of described support bar (32).

2. spinner flowmeter dismantling device according to claim 1, is characterized in that, one end away from described sliding sleeve (31) of described support bar (32) is provided with square (40).

3. spinner flowmeter dismantling device according to claim 1, is characterized in that, (32) are provided with external screw thread to described support bar, and described regulating part (33) is for being set in the adjusting nut on described support bar (32).

4. spinner flowmeter dismantling device according to claim 1, is characterized in that, (32) are provided with external screw thread to described support bar;

Described sliding sleeve (31) is provided with shoulder hole (311), larger one end, the aperture of described shoulder hole (311) is near described regulating part (33), and one end that the aperture of described shoulder hole (311) is less is provided with the internal thread coordinated with the external screw thread on described support bar (32).

5. spinner flowmeter dismantling device according to claim 1, is characterized in that, the two ends of described crossbeam (11) all arrange anti-drop assembly (50).

6. spinner flowmeter dismantling device according to claim 5, it is characterized in that, the two ends of described crossbeam (11) are provided with thread segment, and described anti-drop assembly (50) comprises and is removably set in screwed retaining ring (51) on described thread segment and anti-dropping gasket (52).

7. spinner flowmeter dismantling device according to claim 1, is characterized in that, described spinner flowmeter dismantling device also comprises:

Fixture ring of adjustable (12), described fixture ring of adjustable (12) is set on described crossbeam (11), described fixture ring of adjustable (12) is fixedly installed connecting rod (121), described backstay (21) is removably fixed on described fixture ring of adjustable (12) by described connecting rod (121).

8. spinner flowmeter dismantling device according to claim 1, is characterized in that, described spinner flowmeter dismantling device also comprises:

Connecting ring (13), described connecting ring (13) is set on described crossbeam (11), and described sliding sleeve (31) is fixedly connected on described connecting ring (13).

9. spinner flowmeter dismantling device according to claim 1, is characterized in that, described driven unit (30) is two, and described two driven units (30) are arranged on the both sides of described coupling assembling (20).

10. spinner flowmeter dismantling device according to claim 1, is characterized in that, described backstay (21) is two.