阅读说明：本技术 一种薄壁波纹管气密性快速检测装置用检测夹具 (Detection clamp for rapid detection device for air tightness of thin-wall corrugated pipe ) 是由 王锐 刘永 肖睿 章春 叶朝晖 朱广松 于 2021-09-28 设计创作，主要内容包括：本发明涉及一种薄壁波纹管气密性快速检测装置用检测夹具,属于金属软管制造及气密检测领域。该夹具筒座的缩径孔与径向气孔连通,且其中插装通气阀杆；扩径孔中插装的弹性筒夹外端具有花瓣状夹持爪,弹性筒夹的内部具有隔环；通气阀杆的前端穿出隔环后装有通过锥形套、密封塞、垫片压持隔环的弹性筒撑；隔环的后面与扩径孔的底部之间装有弹簧；弹性筒撑的内端具有花瓣状撑持爪；通气阀杆的中心通气孔与径向孔连通,且后端铰装具有夹持和松释位置的转位手柄。本发明同时借助由内朝外撑持波纹管波峰的弹性筒撑以及由外朝内夹持波纹管波谷的弹性筒夹实现对待试波纹管的固定,可以有效避免薄壁波纹管的单侧夹持变形以及损伤。(The invention relates to a detection clamp for a device for rapidly detecting the air tightness of a thin-wall corrugated pipe, and belongs to the field of metal hose manufacturing and air tightness detection. The reducing hole of the clamp cylinder seat is communicated with the radial air hole, and an air valve rod is inserted in the reducing hole; the outer end of the elastic collet chuck inserted in the expanding hole is provided with a petal-shaped clamping claw, and the inside of the elastic collet chuck is provided with a spacer ring; the front end of the ventilation valve rod penetrates through the spacer ring and is provided with an elastic cylinder support which presses the spacer ring through a conical sleeve, a sealing plug and a gasket; a spring is arranged between the back of the spacer ring and the bottom of the expanding hole; the inner end of the elastic cylinder support is provided with a petal-shaped support claw; the central vent hole of the vent valve rod is communicated with the radial hole, and the rear end of the vent valve rod is hinged with a transposition handle with clamping and releasing positions. The invention realizes the fixation of the corrugated pipe to be tested by means of the elastic cylinder support which supports the wave crest of the corrugated pipe from inside to outside and the elastic cylinder clamp which clamps the wave trough of the corrugated pipe from outside to inside, and can effectively avoid the unilateral clamping deformation and the damage of the thin-wall corrugated pipe.)

1. The utility model provides a thin wall bellows gas tightness short-term test device is with detecting anchor clamps which characterized in that: comprises a cylinder seat (402) with a front section of a flared diameter-expanding hole and a rear section of a diameter-reducing hole; the reducing hole is communicated with the radial air hole (2.1), and a vent valve rod (412) forming a sealing moving pair is inserted into the reducing hole;

an elastic collet chuck (401) is inserted into the diameter expanding hole, the outer end of the elastic collet chuck is provided with petal-shaped clamping claws matched with wave troughs of the corrugated pipe, and a spacer ring (1.1) is arranged inside the elastic collet chuck;

the front end of the ventilation valve rod penetrates through the spacer ring and is provided with an elastic cylinder support (406) which presses the spacer ring through a conical sleeve (407), a sealing plug (408) and a gasket (409); a spring (410) is arranged between the back surface of the spacer ring and the bottom of the expanding hole; the inner end of the elastic cylinder support is provided with a petal-shaped supporting claw matched with the inner wall of the wave crest of the corrugated pipe;

a central vent hole (1.3) of the vent valve rod is communicated with the radial hole (1.2), and the rear end of the vent valve rod is hinged with an indexing handle (405) with clamping and releasing positions;

when the transposition handle is in the clamping position, the ventilation valve rod is in the pulled and retracted position, and the elastic cylinder support is in the expanded supporting state after the rear end is wedged with the conical sleeve; the sealing plug is pressed to expand, and the radial hole is aligned with the radial air hole; the elastic collet chuck is in a clamping state that the spacing ring compression spring and the front end are embedded into the bell mouth;

when the indexing handle is in a release position, the vent valve rod is in a released and extended position, and the elastic cylinder support is in a release state that the rear end is retracted after the conical sleeve is loosened; the sealing plug is elastically restored, and the radial hole is positioned at a position deviating from the radial air hole; the elastic collet chuck is in a release state that the spacing ring releases the spring and the front end is separated from the bell mouth.

2. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 1, characterized in that: the outer section of the elastic collet chuck is provided with a conical section matched with the cone of the horn mouth at the front end of the cylinder seat; the inner opening of the clamping jaw is an arc bayonet matched with the outer wall of the wave trough of the corrugated pipe in shape.

3. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 2, characterized in that: the inner part of the elastic cylinder support is provided with a taper hole section which is matched with the taper of the corresponding part of the tapered sleeve; the outer opening of the supporting claw is an arc supporting opening matched with the shape of the inner wall of the wave crest of the corrugated pipe.

4. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 3, characterized in that: the transposition handle is provided with a sealing gasket which blocks the rear end of the ventilation valve rod in a clamping state.

5. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 4, characterized in that: the tail end of the ventilation valve rod is provided with a sealing ring and a screwable exhaust valve core, and the conical head at the lower end of the exhaust valve core is embedded into the sealing gasket.

6. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 5, characterized in that: the rear end of the ventilation valve rod is hinged with a transposition handle through a riveting rod; the indexing handle has a clamping position and a release position perpendicular to and parallel to the axial direction of the cylinder base, respectively, and has a cam curved profile which is kept in contact with the tail cover at the bottom of the cylinder base.

7. The detection clamp for the thin-wall corrugated pipe air tightness rapid detection device according to claim 6, characterized in that: the reducing hole of the cylinder seat is inserted with an O-shaped sealing ring which is distributed at intervals to form a ventilation valve rod of a sealing moving pair.

Technical Field

The invention relates to a detection clamp for a rapid detection device for detecting the air tightness of a thin-wall corrugated pipe, in particular to a rapid clamping and detection device suitable for detecting the air tightness of a small-caliber metal thin-wall corrugated pipe below DN50 caliber, and belongs to the technical field of metal hose detection.

Background

After the production of the tube blank of the corrugated tube is finished, the air tightness detection for detecting whether the leakage phenomenon exists in the corrugated tube needs to be carried out so as to ensure the production quality of the corrugated tube and improve the product percent of pass. When carrying out the gas tightness and detecting, need sealed centre gripping bellows tip, aerify and detect, mostly manual operation at present, not only inefficiency, moreover because the centre gripping dynamics is mastered not well, the phenomenon that the tube tip presss from both sides bad appears in the inevitable, especially thin-walled bellows, warp because the centre gripping is improper very easily.

The retrieval shows that Chinese patent with publication number CN105841900A discloses a bellows gas tightness detection jig, which comprises a base, an inner cavity blocking head and an outer wall sealing clamping assembly fixed on the base, a gap for inserting the end part of the bellows is arranged between the inner cavity blocking head and the outer wall sealing clamping assembly, the inner cavity blocking head is provided with a gas injection hole, the outer wall sealing clamping assembly is provided with a fixed clamping part and a sliding clamping part which are arranged in a split manner, a first cylinder is arranged for driving the sliding clamping part to move or move back, and the outer wall of the end part of the bellows is clamped in a matching manner with the fixed clamping part during the process of the sliding clamping part. The end part of the pipeline is sealed by the inner cavity plugging head and the outer wall sealing clamping assembly, so that the inner cavity of the pipeline forms a closed space, gas is injected into the closed inner cavity through the gas injection hole, and the gas tightness of the corrugated pipe is detected by testing the pressure change of the inner cavity. In practice, the technical scheme is difficult to avoid the damage of the pipe wall and the port in the detection process, and is not suitable for quick clamping of coiled corrugated pipes.

In addition, the chinese patent with publication number CN 109100086B discloses a detection clamp for a detection device for detecting the air tightness of a corrugated pipe, which comprises a base, a lifting block, a lifting mechanism and a controller, the upper surface of the base is fixedly connected with the bottom of the clamping mechanism at a position close to the right end, the lifting block is positioned at the left side of the clamping mechanism, the left end of the upper surface of the lifting block is fixedly connected with the cylinder, the right end of the upper surface of the lifting block is fixedly connected with the bottom of the inflating mechanism, the output shaft of the air cylinder is fixedly connected with the left side of the inflating mechanism, the controller is electrically connected with the clamping mechanism, the lifting mechanism and the inflating mechanism, aiming at the corrugated pipes with different specifications, when the air tightness of the corrugated pipe is detected, the corrugated pipe is placed on the clamping mechanism, after the clamping mechanism clamps the corrugated pipe, the lifting mechanism is automatically adjusted, so that the corrugated pipe is opposite to the inflating mechanism and the inflating mechanism is tightly connected with the corrugated pipe under the driving of the cylinder. The technical scheme has the problems that the thin-wall corrugated pipe is easy to clamp and deform, the mechanism is complex, and the operation is complicated; after the detection is finished, practical pressure relief and exhaust cannot be carried out, and the safety is low.

Chinese patent application No. 201821430199.1 discloses a metal bellows pin collet for incision, including the collet body, a plurality of groove has been seted up on the collet body, a plurality of clamping part is equallyd divide into with the one end of collet body in the groove, and the tip of a plurality of clamping part is seted up flutedly. Although the spring chuck is simple in structure, the corrugated pipe is directly placed into the spring clamp, the efficiency is improved, the spring chuck is only suitable for processing cuts of the corrugated pipe in batches, and is not suitable for quick detection and clamping of the air tightness of the corrugated pipe which needs to be clamped and controlled by an air path, and the corrugated pipe is still difficult to avoid crushing and deformation by a clamped part.

Disclosure of Invention

The invention aims to: aiming at the problems in the prior art, the detection clamp for the thin-wall corrugated pipe air tightness rapid detection device can effectively avoid clamping deformation and damage, and is very convenient to clamp and control and high in adaptability.

In order to achieve the purpose, the basic technical scheme of the detection clamp for the thin-wall corrugated pipe air tightness rapid detection device is as follows: comprises a cylinder seat with a front section of a flared diameter expanding hole and a rear section of a diameter reducing hole; the diameter reducing hole is communicated with the radial air hole, and a ventilation valve rod forming a sealing moving pair with the diameter reducing hole is inserted in the diameter reducing hole;

an elastic collet chuck is inserted into the diameter-expanding hole, the outer end of the elastic collet chuck is provided with petal-shaped clamping claws matched with the outer wall of the wave trough of the corrugated pipe, and a spacer ring is arranged inside the elastic collet chuck;

the front end of the ventilation valve rod penetrates through the spacer ring and is provided with an elastic cylinder support which presses the spacer ring through a conical sleeve, a sealing plug and a gasket; a spring is arranged between the back of the spacer ring and the bottom of the expanding hole; the inner end of the elastic cylinder support is provided with a petal-shaped supporting claw matched with the inner wall of the wave crest of the corrugated pipe;

the central vent hole of the vent valve rod is communicated with the radial hole, and the rear end of the vent valve rod is hinged with a transposition handle with clamping and releasing positions;

when the transposition handle is in the clamping position, the ventilation valve rod is in the pulled and retracted position, and the elastic cylinder support is in the expanded supporting state after the rear end is wedged with the conical sleeve; the sealing plug is pressed to expand, and the radial hole is aligned with the radial air hole; the elastic collet chuck is in a clamping state that the spacing ring compression spring and the front end are embedded into the bell mouth;

when the indexing handle is in a release position, the vent valve rod is in a released and extended position, and the elastic cylinder support is in a release state that the rear end is retracted after the conical sleeve is loosened; the sealing plug is elastically restored, and the radial hole is positioned at a position deviating from the radial air hole; the elastic collet chuck is in a release state that the spacing ring releases the spring and the front end is separated from the bell mouth.

After the detection clamp is adopted, when the transposition handle is in the releasing position, one end of the corrugated pipe is inserted into the inlet end of the detection clamp to be limited by the spacing ring; rotating the transposition handle to a clamping position, enabling the sealing plug to expand and deform due to the fact that the vent valve rod moves and is pressed, so that tight fit and sealing between the sealing plug and the inner wall of the corrugated pipe are achieved, the rear end of the elastic cylinder support is wedged with the conical sleeve and then expands, the inner wall of a wave crest of the corrugated pipe is supported from inside to outside, meanwhile, the front end of the elastic cylinder support is embedded into the horn mouth to enable the petal-shaped clamping claws to contract, and the outer wall of the wave trough of the corrugated pipe is clamped from outside to inside; the other end of the bellows is then inserted into another inspection fixture. Then, open the leak detector, through radial gas pocket and with it aim at the radial pore pair bellows of intercommunication and aerify, steady voltage, detect the gas tightness can, high-efficient, convenient, stable.

Therefore, the invention realizes the fixation of the corrugated pipe to be tested by the elastic cylinder support which supports the inner wall of the wave crest of the corrugated pipe from inside to outside and the elastic cylinder clamp which clamps the outer wall of the wave trough of the corrugated pipe from outside to inside, and the internal and external acting forces are basically balanced, thereby effectively avoiding the unilateral clamping deformation and damage of the thin-wall corrugated pipe. In addition, the ventilation valve rod is not only an air path opening and closing piece, but also a clamping operation piece, so the structure is simple, the switching of the position of the ventilation valve rod simultaneously realizes the switching of the air path and the clamping action, the clamping operation is very convenient, the elastic collets with different specifications are easy to replace, the ventilation valve rod is suitable for the corrugated pipes with various specifications, and the adverse effect of human factors on the detection is eliminated.

The invention has the further perfection that: the outer section of the elastic collet chuck is provided with a conical section matched with the cone of the horn mouth at the front end of the cylinder seat; the inner opening of the clamping jaw is an arc bayonet matched with the outer wall of the wave trough of the corrugated pipe in shape.

The invention has the further perfection that: the inner part of the elastic cylinder support is provided with a taper hole section which is matched with the taper of the corresponding part of the tapered sleeve; the outer opening of the supporting claw is an arc supporting opening matched with the shape of the inner wall of the wave crest of the corrugated pipe.

The invention has the further improvement that: the transposition handle is provided with a sealing gasket which blocks the rear end of the ventilation valve rod in a clamping state.

The invention has the further perfection that: the tail end of the ventilation valve rod is provided with a sealing ring and a screwable exhaust valve core, and the conical head at the lower end of the exhaust valve core is embedded into the sealing gasket.

The invention has the further perfection that: the rear end of the ventilation valve rod is hinged with a transposition handle through a riveting rod; the indexing handle has a clamping position and a release position perpendicular to and parallel to the axial direction of the cylinder base, respectively, and has a cam curved profile which is kept in contact with the tail cover at the bottom of the cylinder base.

The invention is still further perfected as follows: the reducing hole of the cylinder seat is inserted with an O-shaped sealing ring which is distributed at intervals to form a ventilation valve rod of a sealing moving pair.

Drawings

FIG. 1 is a schematic perspective view of one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the embodiment of FIG. 1;

FIG. 3 is a schematic view of the embodiment of FIG. 1 in use;

FIG. 4 is a schematic structural view of the unclamped state of FIG. 3;

FIG. 5 is a schematic view of the clamped state of FIG. 3;

FIG. 6 is a cross-sectional structural schematic view of the resilient collet of FIG. 4;

FIG. 7 is a cross-sectional structural schematic view of the resilient collet of FIG. 5;

FIG. 8 is a perspective view of the resilient collet of the embodiment of FIG. 1;

fig. 9 is a schematic perspective view of the elastic cylinder support of the embodiment of fig. 1.

Detailed Description

As shown in fig. 1 and 2, the front section of the cylinder base 402 is an expanded diameter hole with a front end bell mouth, and the rear section is a reduced diameter hole. The reducing hole is communicated with the radial air hole 2.1, and a ventilation valve rod 412 which forms a sealing moving pair through an O-shaped sealing ring 411 is inserted into the reducing hole, and the bottom of the reducing hole is embedded with the tail cover 404.

An elastic collet chuck 401 is inserted into the expanding hole, the specific structure of the elastic collet chuck 401 is shown in fig. 8, six petal-shaped clamping claws 4013 formed by axial opening grooves of the cylinder wall are arranged at the outer end of the elastic collet chuck 401, the inner openings of the clamping claws 4013 are arc-shaped bayonets 4011 matched with the corrugated pipe, specifically matched with the wave trough shape of the corrugated pipe 5, and therefore clamping injury can be effectively avoided. The outer section of the resilient collet 401 has a tapered section 4012 that is adapted to the flare taper at the front of the collet 402 so that the clamping jaws 4013 can be tightened or released when they are displaced axially relative to each other. The interior of the resilient collet 401 has a spacer ring 1.1. A spring 410 is arranged between the back surface of the spacer ring 1.1 and the bottom of the expanding hole.

An elastic cylinder support 406 which presses the spacer ring 1.1 through a conical sleeve 407, a sealing plug 408 and a metal gasket 409 is arranged after the external thread at the end part of the front end reducing section of the ventilation valve rod 412 penetrates through the spacer ring 1.1. The force of the clamping force can be adjusted by screwing the spring collet 406. The tail end of the vent valve rod 412 is provided with a sealing ring 413 and a screwed exhaust valve core 414. Screwing the exhaust spool 414 compresses the sealing ring 413 sufficiently to ensure a reliable seal between the exhaust spool 414 at the end of the stem and the vent stem 412, and the tapered head at the lower end of the exhaust spool 414 may be fully embedded in the gasket 415 so that it is compressed and reliably sealed. The central vent hole 1.3 of the vent valve rod 412 is communicated with the radial hole 1.2, the rear end of the vent valve rod is hinged with an indexing handle 405 through a riveting rod 403, and the indexing handle 405 has two positions of clamping and releasing respectively vertical and parallel to the axial direction of the cylinder seat 402 and has a cam curved profile which is kept in contact with the tail cover 404 at the bottom of the cylinder seat 402.

The specific structure of the elastic cylinder support 406 is as shown in fig. 9, the inner end of the elastic cylinder support has six petal-shaped supporting claws 6013 formed by axial opening grooves of the cylinder wall, and the outer opening of the supporting claws 6013 is an arc supporting opening 6012 matched with the wave crest inner wall of the corrugated pipe 5 in shape, so that the supporting claws 6013 can be matched with the arc bayonet 4011 of the clamping claw 4013 of the elastic cylinder clamp 401 inside and outside, and clamping deformation and clamping damage of the thin-wall corrugated pipe are effectively avoided. The inner part of the elastic cylinder support is provided with a taper hole section 6011 which is matched with the taper of the corresponding part of the tapered sleeve 407 in a taper mode, so that the supporting claw 6013 can be tightened or loosened when the elastic cylinder support is relatively axially displaced. In addition, one end of the elastic cylinder support 406 is provided with a flat surface 6014 for facilitating screwing.

As shown in fig. 3, in practical use of this embodiment, the detection clamps 4 and 6 for the bellows airtightness rapid detection apparatus respectively support and clamp two ends of the bellows 5 in pairs, and the difference is that the detection clamp 6 does not need to be provided with the radial hole 1.2 and the radial air hole 2.1, and only plays a role of clamping and plugging, and the detection clamp 4 is connected to the compressed air source 2 through the air pipe 3 via the leak detector 1 via the radial air hole 2.1.

Before detection, as shown in fig. 4 (see fig. 6), firstly, inserting two ends of a corrugated pipe 5 to be detected into detection clamps 4 and 6 for a corrugated pipe air tightness rapid detection device respectively, wherein at the moment, an indexing handle 405 is in a releasing position which is vertical to the axial direction of a cylinder base 402, an air vent valve rod 412 is in a released extending position, an elastic cylinder support 406 is displaced along with the displacement of the indexing handle, so that a conical hole section 6011 is separated from a conical sleeve 407, and a support claw 6013 is released; at the same time, the spacer ring 1.1 releases the spring 410, the elastic collet chuck 401 under the action of the spring 410, the conical section 4012 comes out of the bell mouth at the front end of the cylinder seat 402, so that the clamping claws 4013 are released, the sealing plug 408 is elastically restored, the radial hole 1.2 is at a position deviating from the radial air hole 2.1, and the vent valve rod 412 is actually closed.

Next, as shown in fig. 5 (see fig. 7), the indexing handle 405 is rotated by 90 ° to be in the clamping position, and at this time, the vent valve rod 412 is in the retracted position under the action of the cam profile, and the elastic cylinder support 406 is displaced therewith, so that the conical hole section 6011 is wedged into the conical sleeve 407, and thus the supporting claw 6013 is spread, and the inner wall of the wave crest of the corrugated tube 5 is supported from inside to outside; meanwhile, the sealing plug 408 is pressed to expand to form a seal in the corrugated pipe 5, the radial hole 1.2 is aligned with the radial air hole 2.1, so that the vent valve rod 412 is in an opened state, the elastic collet chuck 401 is positioned at the position of the spacer ring 1.1, the spring 410 is compressed, the front end conical section 4012 is embedded into the front end bell mouth of the cylinder seat 402, and the clamping claws 4013 contract inwards and are clamped into the outer wall position of the wave trough of the corrugated pipe 5 from outside to inside to reliably clamp the corrugated pipe. And then keeping the clamp still, starting the gas source 2 and the leak detector 1, filling high-pressure gas into the corrugated pipe 5 to be detected through the gas pipe 3, keeping for a period of time, and if the gas pressure is kept within a normal range, performing qualified gas detection on the corrugated pipe. At this moment, close air supply 2, restore the transposition handle to the release position, take out the bellows can, very convenient.

It should be noted that the indexing handle 405 of this embodiment is provided with a sealing pad 415 for sealing the rear end of the vent valve rod 412 in a clamped state, and when the cam curved profile pole diameter changes to drive the vent valve rod 412 to move backward to seal between the sealing plug 408 and the bellows, the vent valve rod tail end exhaust valve core 414 can be embedded into the sealing pad 415 to further seal one end of the central vent hole 1.3 of the vent valve rod 412, and the release process gradually opens the central vent hole 1.3 to slowly exhaust air, thereby preventing the bellows from being thrown to cause injury.

Tests show that the detection clamp for the corrugated pipe air tightness rapid detection device has the following advantages:

(1) the principle of 'external clamping and internal expansion' is ingeniously utilized, reliable internal supporting and external clamping and plugging are realized, and the air valve switching is realized at the same time in a simple structure, so that the efficiency is high;

(2) the internal support external clamp is respectively and fully matched with the wave crest and the wave trough of the corrugated pipe, thereby not only completely preventing the corrugated pipe from displacing and effectively avoiding the clamping injury, but also preventing the deformation of the thin-wall corrugated pipe;

(3) the reasonable spacer ring structure not only realizes clamping reset by virtue of the spring, but also can limit the insertion depth of the corrugated pipe and avoid the end part of the corrugated pipe from being extruded and damaged;

(4) when corrugated pipes with different specifications are detected, only elastic collet chucks and sealing plugs with different specifications need to be replaced, so that the adaptability is strong, and the device is suitable for leak detection of large-batch and large-coil corrugated pipes;

(5) the sealed cooperation that fills up on ventilation valve rod and the handle helps preventing the maloperation, guarantees safety: before detection, preventing mistaken inflation; in the detection, the sealing performance is ensured; after the detection is finished, the tail end of the vent valve rod is gradually deflated, so that the danger caused by high-pressure gas is avoided.

In a word, the anchor clamps adaptation scope of this embodiment is wide, can wait to examine the bellows by the quick clamping, has promoted work efficiency widely, safe and reliable.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.