CN215065120U - Oil filling pipe sealing performance detection device - Google Patents

Abstract

The utility model relates to a device for detecting the tightness of an oil filling pipe, which comprises a frame, wherein the frame is suspended with a first plugging device through a flexible connecting piece, a second plugging device is fixed on the frame, the first plugging device comprises a base, a first limit groove is arranged on a first limit plate on the base, the first limit groove comprises a side notch giving the pipe body abdication and a positioning groove for clamping an expanding section of an oil filling pipe cup mouth, a first linear driving mechanism is fixed on the base, the first linear driving mechanism is connected with a first sealing plug for plugging the oil filling pipe cup mouth, the second plugging device comprises a cylinder body and a piston rod, a slidable piston is arranged in an inner cavity of the cylinder body, a piston sleeve is arranged on the piston rod, the two ends of the piston rod extend out of the cylinder body, the piston rod is provided with an air guide hole which is axially communicated, the upper end of the piston rod is provided with a fixing piece, an expansion sealing piece is arranged between the fixing piece and the cylinder body, the expansion sealing element is sleeved on the piston rod.

Description

Oil filling pipe sealing performance detection device

Technical Field

The utility model relates to a pipe fitting leakproofness detection device, concretely relates to add oil pipe leakproofness detection device.

Background

Along with the improvement of living standard, the automobile market is gradually expanded, the quality of an automobile is required to be higher, quality detection needs to be carried out on all parts in the automobile production, only qualified parts can be assembled on the automobile, the oil filling pipe needs to be subjected to tightness detection in order to prevent oil leakage of the oil filling pipe, and in the prior art, the tightness of the oil filling pipe is mainly detected by fixing the oil filling pipe on an air tightness detection device and injecting gas into the oil filling pipe.

However, in actual production, due to the difference of vehicle types or brands, the pipe orifice or pipe body diameter of the oil filling pipe has different standards, and due to the space limitation in the carriage, the oil filling pipe often has a complex space trend shape, the existing air tightness detection device is adopted to detect the oil filling pipe, and generally, the fixing device is adopted to fix the oil filling pipe on the air tightness detection device and inject air into the oil filling pipe to detect the tightness. Because the pipe shaft diameter and the space of filling oil pipe trend the form different, often need adapt to the airtight detection device who fills oil pipe space trend form, consequently want to carry out airtight detection to the filling oil pipe of different standard different shapes, just need a plurality of different airtight detection devices. In practical application, the existing detection mode of the oil filling pipe is very limited, and the investment of sealing detection equipment is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses mainly to prior art not enough, provide a leakproofness detection device who adds oil pipe in order to detect the leakproofness of adding oil pipe of different standards, different shapes.

In order to solve the technical problem, the utility model provides a device for detecting the sealing performance of an oil filling pipe, which comprises a frame, wherein the frame is used for suspending a first plugging device through a flexible connecting piece, a second plugging device is fixed on the frame, the first plugging device comprises a base, a first limiting groove is arranged on a first limiting plate on the base, the first limiting groove comprises a lateral opening giving way to a pipe body and a positioning groove used for clamping an expanding section of a cup opening of the oil filling pipe, a first linear driving mechanism is fixed on the base, a first sealing plug used for plugging the cup opening of the oil filling pipe is connected on the first linear driving mechanism, the second plugging device comprises a cylinder body and a piston rod, a slidable piston is arranged in an inner cavity of the cylinder body, the piston sleeve is arranged on the piston rod, the two ends of the piston rod extend out of the cylinder body, the piston rod is provided with an air guide hole which is axially communicated, the upper end of the piston rod is provided with a fixing piece, an expansion sealing piece is arranged between the fixing piece and the cylinder body, and the expansion sealing piece is sleeved on the piston rod.

Furthermore, the positioning groove is an arc groove, and the groove wall of the positioning groove and the expanding section of the cup mouth of the oil filling pipe are in profile modeling.

Further, the base includes first upper end plate and first end plate down, first upper end plate with first end plate both sides are fixed with riser and second riser, first linear drive mechanism fixes on the first upper end plate, first sealed end cap is located the riser with between the second riser, first limiting plate sets up on first end plate down, first limiting plate with be provided with the second limiting plate that can move about from top to bottom between the first sealed end cap, be provided with the spacing recess of second on the second limiting plate, the second limiting plate with be provided with the guide element between the first end plate down.

Further, be provided with square groove on the first end plate, first limiting plate articulates on square groove through the flange that sets up along outer, square groove's notch is provided with the stopper that the first limiting plate of restriction drops, the stopper passes through the bolt fastening on the first end plate.

Further, the guide element includes guide post, elastic element and with guide post sliding fit's stop collar, guide post sliding fit is in on the first lower end plate, the guide post upper end with second limiting plate connection, the elastic element cover is established on the guide post and is located first lower end plate with between the second limiting plate, the stop collar cover is put the guide post lower extreme, the lower extreme of stop collar passes through locating part axial on the guide post is spacing.

Furthermore, an intelligent lifting device is arranged on the rack, and the first blocking device is hung on the rack through a flexible connecting piece on the intelligent lifting device.

Furthermore, a first shaft shoulder is arranged on a rod body of the piston rod, which extends out of the cylinder body upwards, a supporting sleeve is arranged at the lower end of the expansion sealing element, the supporting sleeve is sleeved on the piston rod, the lower end of the supporting sleeve is in contact with the cylinder body, a convex shoulder is arranged at the upper section of the inner wall of the supporting sleeve, and the convex shoulder is abutted against the first shaft shoulder.

Furthermore, a third shaft shoulder is arranged on a rod body of the cylinder body, the piston rod extends downwards out of the cylinder body, a guide seat is fixed on a lower end cover of the cylinder body, a first through hole in sliding fit with the lower end of the piston rod is arranged on the guide seat, a limiting nut is connected to the lower end of the guide seat in a threaded manner, a second through hole for the piston rod to penetrate through is formed in the limiting nut, and the orifice of the second through hole is axially limited by the third shaft shoulder.

Furthermore, a locking nut is arranged above the limiting nut and is in threaded connection with the lower end of the guide seat.

Further, the expansion sealing element is a rubber sealing ring.

The beneficial effects of the utility model are that as follows, the frame makes first plugging device and second plugging device become a whole. The first plugging device is hung on the rack through a flexible connecting piece, the second plugging device is fixed on the rack, the second plugging device plugs an oil outlet of the oil filling pipe, and the first plugging device plugs a cup mouth of the oil filling pipe. The oil filling pipe is placed into the positioning groove of the first limiting groove from the lateral opening of the first limiting groove, when the oil filling pipe falls downwards, the positioning groove on the first plugging device is connected with the oil filling pipe cup opening expanding section of the oil filling pipe in a clamping mode, and the first sealing plug moves towards the oil filling pipe cup opening under the action of the first linear driving mechanism until the oil filling pipe cup opening is plugged. The expansion sealing element on the second plugging device is extruded and expanded under the action of the piston rod and contacts with the inner wall of the filler neck to seal the filler neck. The oil-out that will add the oil pipe cup joints on the inflation sealing member, when needing to seal, through the through-hole on the cylinder body to the cylinder body in injection medium, the medium promotes the piston and slides, the piston drives the piston rod motion, because the upper end of piston rod is provided with the mounting, the inflation sealing member sets up between mounting and cylinder body, when the piston rod downstream, the mounting can be to the downward extrusion of inflation sealing member, and there is the blockking of cylinder body in the below of inflation sealing member, consequently the inflation sealing member is to expanding all around, thereby reach sealed effect with the oil-out pipeline inner wall full contact of adding the oil pipe.

The utility model discloses during the use, establish on the inflation sealing member with the oil-out cover that adds the oil pipe earlier, will add the oiling pipe rim of a cup hole diameter enlargement section joint of oil pipe again in first stop groove of a plugging device. Because the utility model discloses hang first plugging device in the frame through flexible connectors, when the oil-out cover that adds the oil pipe establishes on second plugging device's the inflation sealing member fixedly, no matter add the space trend form of oil pipe and change, can all seal it with first plugging device according to the position removal of the oiling pipe rim of a cup of oil pipe. And the extrusion force that the inflation sealing member received is different, and the inflation degree of inflation sealing member also is different, can adapt to the sealed of different mouth of pipe bores bore. The positioning groove on the first plugging device is clamped with the diameter expansion section of the cup opening of the oil filling pipe, and when the first sealing plugging head tightly plugs the cup opening of the oil filling pipe, tight pressure can be formed on the cup opening of the oil filling pipe, and the cup opening of the oil filling pipe is fixed on the first plugging device due to the limitation of the positioning groove on the diameter expansion section of the cup opening of the oil filling pipe. After the sealing detection device is started, the expansion sealing element on the second plugging device deforms and expands under the movement of the piston rod to plug the oil outlet of the oil filling pipe, and the first sealing plug on the first plugging device moves towards the cup opening of the oil filling pipe until the cup opening of the oil filling pipe is plugged, so that the oil inlet and the oil outlet at the two ends of the oil filling pipe are plugged in an air-tight mode.

The invention will be further explained with reference to the drawings and the specific embodiments.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of a first plugging device of the present invention;

fig. 3 is a schematic diagram of a first stopper structure in the first plugging device of the present invention;

fig. 4 is a schematic structural view of a second plugging device of the present invention;

fig. 5 is a cross-sectional view of a second occlusion device of the present invention.

In the drawings: 1-a frame, 2-a flexible connection, 3-a first plugging device, 4-a second plugging device, 5-a base, 6-a first limit plate, 7-a positioning groove, 71-a lateral opening, 72-a positioning groove, 9-a first linear driving mechanism, 10-a first sealing plug, 12-an expansion sealing element, 13-a cylinder, 14-a piston rod, 16-a piston, 17-an air guide hole, 18-a fixing element, 51-a first upper end plate, 52-a first lower end plate, 53-a first vertical plate, 54-a second vertical plate, 19-a square groove, 20-a second limit plate, 21-a second limit groove, 22-a guide element, 221-a guide column, 222-an elastic element, 223-a limit sleeve, 23-a limit block, 141-a first shaft shoulder, 143-a third shaft shoulder, 24-a guide seat, 241-a first through hole, 25-a limiting nut, 251-a second through hole, 252-a locking nut, 253-a limiting nut, 26-a supporting sleeve, 261-a shoulder and 27-a gasket.

Detailed Description

Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 5, an embodiment of a device for detecting the tightness of a filler tube, includes a frame 1, the frame 1 suspends a first plugging device 3 through a flexible connecting member 2, the flexible connecting member 2 may be a flexible connecting member such as a spring or a cable, preferably, an intelligent lifting device is disposed on the frame 1, the first plugging device 3 is suspended on the frame 1 through the flexible connecting member 2 on the intelligent lifting device, when a filler tube cup of the filler tube is clamped on the first plugging device 3, the filler tube and the first plugging device 3 as a whole can increase the load of the frame 1, the intelligent lifting device can balance the gravity of the filler tube and the first plugging device 3 by using the suspension function of the intelligent lifting device, and facilitate the operation of lifting or lowering the first plugging device 3.

The oil filling pipe sealing device is characterized in that a second plugging device 4 is fixed on the rack 1, the first plugging device 3 comprises a base 5, a first limiting groove 7 is formed in a first limiting plate 6 on the base 5, the first limiting groove 7 comprises a lateral opening 71 for yielding the pipe body and a positioning groove 72 for clamping the diameter-expanded section of the cup opening of the oil filling pipe, the positioning groove 72 is a U-arc-shaped groove, and the groove wall of the positioning groove 72 is in profile modeling with the diameter-expanded section of the cup opening of the oil filling pipe. At this time, the lateral opening 71 can guide the cup mouth expanding section of the filler pipe, so that the cup mouth expanding section of the filler pipe can be conveniently placed into the limiting groove, the positioning groove 72 of the first limiting groove 21 can be clamped on the cup mouth expanding section of the filler pipe, the expanding position of the cup mouth expanding section of the filler pipe is limited, the phenomenon that the cup mouth of the filler pipe slides out of the limiting groove due to the compression force generated on the filler pipe when the first sealing plug 10 compresses and seals the cup mouth of the filler pipe is avoided, the groove wall of the positioning groove 72 is partially profiled with the expanding section of the cup mouth expanding section of the filler pipe, and the cup mouth of the filler pipe can be more stably fixed on the first plugging device 3.

A first linear driving mechanism 9 is fixed on the base 5, and the first linear driving mechanism 9 can be an air cylinder, a hydraulic cylinder or an electric telescopic cylinder, and the air cylinder is adopted in the embodiment. The first linear driving mechanism 9 is connected with a first sealing plug 10 for plugging the cup mouth of the oil filling pipe, the first sealing plug 10 is preferably a rubber plug, rubber has high elasticity at normal temperature and very good mechanical strength, and can generate large deformation under small stress, and the deformation can provide contact pressure and compensate leakage gaps to achieve the purpose of sealing.

The second plugging device 4 comprises a cylinder 13 and a piston rod 14, a slidable piston 16 is arranged in an inner cavity of the cylinder 13, the piston 16 is sleeved on the piston rod 14, two ends of the piston rod 14 extend out of the cylinder 13, the piston rod 14 is provided with an air guide hole 17 which is axially communicated, a fixing part 18 is arranged at the upper end of the piston rod 14, the fixing part 18 can be a pressing plate integrated with the piston rod 14 and can also be detachably connected with the piston rod 14, the fixing part 18 in the embodiment is a butterfly nut which is in threaded connection with the piston rod 14, the expansion sealing element 12 can be conveniently replaced, and a gasket 27 can be arranged between the butterfly nut and the expansion sealing element 12. An expansion sealing element 12 is arranged between the fixing element 18 and the cylinder body 13, the expansion sealing element 12 is sleeved on the piston rod 14, and the expansion sealing element 12 is preferably a rubber sealing ring.

Further, the base 5 includes a first upper end plate 51 and a first lower end plate 52, the first upper end plate 51 with first lower end plate 52 both sides are fixed with a first riser 53 and a second riser 54, a first linear driving mechanism 9 is fixed on the first upper end plate 51, a first sealing plug 10 is located the first riser 53 with between the second riser 54, a first limiting plate 6 is arranged on the first lower end plate 52, the first limiting plate 6 with be provided with the second limiting plate 20 that can move about from top to bottom between the first sealing plug 10, be provided with the spacing recess 21 of second on the second limiting plate 20, the second limiting plate 20 with be provided with the guide element 22 between the first lower end plate 52. Guide element 22 includes guide post 221, elastic element 222 and with guide post 221 sliding fit's stop collar 223, guide post 221 sliding fit is in on the first end plate 52 down, guide post 221 upper end with second limiting plate 20 is connected, elastic element 222 cover is established on guide post 221 and is located first end plate 52 down with between the second limiting plate 20, stop collar 223 cover is put guide post 221 lower extreme, the lower extreme of stop collar 223 passes through the locating part axial on the guide post 221 is spacing, and this locating part can be nut or flange. At this moment, through the cooperation of second limiting plate 20 and first limiting plate 6 and guide element 22, make the filler neck rim of cup of filler neck coaxial with first sealed end cap 10, when carrying out the shutoff to the filler neck rim of cup, avoid appearing because the filler neck does not fix and cause filler neck rim of cup slope and first sealed end cap 10 to the sealed bad condition of filler neck rim of cup, in this embodiment, guide element 22 sets up to two sets of and parallel symmetry setting between second limiting plate 20 and first lower end plate 52, can realize the distance change of second limiting plate for first limiting plate through changing the stop collar.

Further, be provided with square groove 19 on the first lower end plate 52, first limiting plate 6 articulates through the flange that sets up along outer on the square groove 19, can conveniently be equipped with stopper 23 to the change of first limiting plate this moment, at the notch of square groove 19, stopper 23 passes through the bolt fastening and is in on the first lower end plate 52, can prevent that first limiting plate 6 from droing or removing. The first limiting plate 6 and the second limiting plate 20 are preferably nylon plates which have the characteristics of wear resistance, low friction coefficient, strong impact resistance and the like, when the expanding section of the cup mouth of the oil filling pipe is repeatedly clamped into and taken out of the limiting groove, the limiting groove easily causes the pipe body of the oil filling pipe to be worn, and the nylon plates can prevent the outer wall of the oil filling pipe from being painted or scratched when the outer wall of the oil filling pipe is clamped into the limiting groove.

Further, a first shoulder 141 is provided on the shaft of the piston rod 14 extending upward out of the cylinder 13, a support sleeve 26 is provided at the lower end of the expansion seal 12, the support sleeve 26 is sleeved on the piston rod 14, the support sleeve 26 is preferably made of nylon, the lower end of the support sleeve 26 is in contact with the cylinder 13, a shoulder 261 is provided at the upper section of the inner wall of the support sleeve 26, and the shoulder 261 abuts against the first shoulder 141. The smaller the diameter of the piston rod 14 at the first shoulder 141 on the piston rod 14, the greater the thickness of the expansion seal 12, the greater the deformation that occurs when the expansion seal 12 is thicker, and the better the sealing effect on the filler tube. The shoulder 261 is arranged on the upper section of the inner wall of the supporting sleeve 26, and the shoulder 261 is abutted with the first shaft shoulder 141, so that the bearing area of the expansion sealing member 12 when being pressed can be increased. Since the second blocking device 4 in this embodiment is always in an inclined state, the shoulder 261 and the first shoulder 141 are cooperatively arranged, which can also play a role in limiting the piston rod 14, and prevent the piston rod 14 from moving upwards excessively, so that the expansion seal is not subjected to the fastening pressure and shakes on the piston rod.

Further, a third shaft shoulder 143 is arranged on a shaft body of the piston rod 14 extending out of the cylinder body 13, a guide seat 24 is fixed on a lower end cover of the cylinder body 13, a first through hole 241 in sliding fit with the lower end of the piston rod 14 is arranged on the guide seat 24, a limit nut 253 is connected to the lower end of the guide seat 24 through threads, a second through hole 251 through which the piston rod 14 passes is arranged on the limit nut 253, and an orifice of the second through hole 251 axially limits the third shaft shoulder 143. The guide seat 24 is engaged with the stop nut 253 and the third shoulder 143, so that the downward sliding distance of the piston rod 14 can be limited. When the diameters of the filler pipe nozzles needing tightness detection are different, the limiting nut 253 can be adjusted upwards or downwards, and when the third shoulder 143 on the piston rod 14 abuts against the inner wall of the limiting nut 253, the maximum deformation of the expansion sealing element 12 in the state is achieved. Further, a locking nut 252 is arranged above the limit nut 253, the locking nut 252 is in threaded connection with the lower end of the guide seat 24, and after the locking nut 252 and the limit nut 253 are screwed, axial opposite-top pressure is generated between the nuts, so that the limit nut 253 is prevented from being automatically loosened, and the position stability of the limit nut 253 is ensured.

When the technical scheme is adopted to detect the sealing performance of the oil filling pipe, the oil outlet of the oil filling pipe is sleeved on the expansion sealing element 12 of the second plugging device 4, the first plugging device 3 is hung on the rack 1 through the flexible connecting piece, the first plugging device 3 is moved to the cup mouth of the oil filling pipe, the cup mouth expanding section of the oil filling pipe is clamped in the first limiting groove 7 and the second limiting groove 21, after the sealing detection device is started, the first sealing plug 10 seals the cup mouth of the oil filling pipe, the expansion sealing element 12 expands and deforms under the action of the piston rod 14 and the fixing piece 18, and the oil outlet of the oil filling pipe is sealed. Adopt the utility model discloses carry out the leakproofness to adding oil pipe and detect, add the oil pipe oil-out and cup joint and go on fixing on the expansion sealing member 12 of second plugging device 4, the other end is fixed through unsettled first plugging device 3, later adopt ordinary end cap among the prior art alone with the shutoff of blast pipe mouth of pipe, the back is accomplished in the shutoff, inject the medium into through the air duct on the first plugging device and carry out the leakproofness test to adding oil pipe, pressure sensor that the air supply communicates with the air duct in the pipeline that sets up detects whole closed gas circuit pressure change, realize that the leakproofness detects. Other parts of the oil filling pipe do not need to be provided with other fixing mechanisms, so that the number of parts of the sealing detection device is reduced, the sealing detection can be carried out on the oil filling pipe with different space trend shapes, and the expansion sealing piece 12 arranged on the second sealing device can also adapt to the sealing of pipe orifice diameters of different oil filling pipes. Adopt the utility model discloses not only can make the leakproofness detect more nimble, can also reduce the input to leakproofness check out test set.

Claims (10)

1. The utility model provides an oil filling pipe leakproofness detection device, includes frame (1), its characterized in that: the oil filling pipe sealing device is characterized in that a first plugging device (3) is suspended on the rack (1) through a flexible connecting piece (2), a second plugging device (4) is fixed on the rack (1), the first plugging device (3) comprises a base (5), a first limiting groove (7) is arranged on a first limiting plate (6) on the base (5), the first limiting groove (7) comprises a lateral opening (71) giving way to a pipe body and a positioning groove (72) used for clamping an oil filling pipe cup opening expanding section, a first linear driving mechanism (9) is fixed on the base (5), a first sealing plug (10) used for plugging the oil filling pipe cup opening is connected onto the first linear driving mechanism (9),

the second plugging device (4) comprises a cylinder body (13) and a piston rod (14), a slidable piston (16) is arranged in an inner cavity of the cylinder body (13), the piston (16) is sleeved on the piston rod (14), two ends of the piston rod (14) extend out of the cylinder body (13), the piston rod (14) is provided with an air guide hole (17) which is axially communicated, a fixing piece (18) is arranged at the upper end of the piston rod (14), an expansion sealing piece (12) is arranged between the fixing piece (18) and the cylinder body (13), and the expansion sealing piece (12) is sleeved on the piston rod (14).

2. The fuel filler pipe sealability detection apparatus of claim 1, wherein: the positioning groove (72) is an arc groove, and the groove wall of the positioning groove (72) is profiled with the diameter-expanding section of the filler pipe cup mouth of the filler pipe.

3. The fuel filler pipe sealability detection apparatus of claim 1, wherein: base (5) include first upper end plate (51) and first lower end plate (52), first upper end plate (51) with first lower end plate (52) both sides are fixed with first riser (53) and second riser (54), first linear drive mechanism (9) are fixed on first upper end plate (51), first sealed end cap (10) are located first riser (53) with between second riser (54), first limiting plate (6) set up on first lower end plate (52), first limiting plate (6) with be provided with second limiting plate (20) that can move about from top to bottom between first sealed end cap (10), be provided with the spacing recess of second (21) on second limiting plate (20), second limiting plate (20) with be provided with guide element (22) between first lower end plate (52).

4. The fuel filler pipe sealability detection apparatus of claim 3, wherein: be provided with square groove (19) on first end plate (52) down, first limiting plate (6) articulate through the flange that sets up along outer on square groove (19), the notch of square groove (19) is provided with stopper (23) that restriction first limiting plate (6) drop, stopper (23) pass through the bolt fastening on first end plate (52) down.

5. The fuel filler pipe sealability detection apparatus of claim 3, wherein: guide element (22) include guide post (221), elastic element (222) and with guide post (221) sliding fit's stop collar (223), guide post (221) sliding fit is in on first lower plate (52), guide post (221) upper end with second limiting plate (20) are connected, elastic element (222) cover is established on guide post (221) and is located first lower plate (52) with between second limiting plate (20), stop collar (223) cover is put guide post (221) lower extreme, the lower extreme of stop collar (223) passes through locating part axial on guide post (221) is spacing.

6. The fuel filler pipe sealability detection apparatus of claim 1, wherein: the intelligent blocking device is characterized in that an intelligent lifting device is arranged on the rack (1), and the first blocking device (3) is hung on the rack (1) through a flexible connecting piece (2) on the intelligent lifting device.

7. The fuel filler pipe sealability detection apparatus of claim 1, wherein: the piston rod (14) upwards extends out of the rod body of the cylinder body (13) and is provided with a first shaft shoulder (141), the lower end of the expansion sealing element (12) is provided with a supporting sleeve (26), the supporting sleeve (26) is sleeved on the piston rod (14), the lower end of the supporting sleeve (26) is in contact with the cylinder body (13), the upper section of the inner wall of the supporting sleeve (26) is provided with a shoulder (261), and the shoulder (261) is abutted to the first shaft shoulder (141).

8. The fuel filler pipe sealability detection apparatus of claim 1, wherein: the piston rod (14) is equipped with third shaft shoulder (143) on the pole body that stretches out cylinder body (13) downwards, be fixed with guide holder (24) on the lower end cover of cylinder body (13), be equipped with on guide holder (24) with first through-hole (241) of piston rod (14) lower extreme sliding fit, the lower extreme threaded connection of guide holder (24) has stop nut (253), be equipped with second through-hole (251) that supply piston rod (14) to pass on stop nut (253), the drill way of second through-hole (251) is spacing to third shaft shoulder (143) axial.

9. The fuel filler pipe sealability detection apparatus of claim 8, wherein: and a locking nut (252) is arranged above the limiting nut (253), and the locking nut (252) is in threaded connection with the lower end of the guide seat (24).

10. The oil filling pipe sealing performance detection device according to any one of claims 1 to 9, characterized in that: the expansion sealing element (12) is a rubber sealing ring.

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