阅读说明：本技术 一种气密试漏用密封工装及试漏方法 (Sealing tool for airtight leakage test and leakage test method ) 是由 石海辉 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种气密试漏用密封工装及试漏方法,属于焊件性能检测技术领域。密封工装包括密封板,其为板状,一端面凸起形成有密封垫,所述密封板端面贯穿形成有让位孔；通气杆,其配合穿过密封板的让位孔,所述通气杆内开设有注气通道,注气通道的出气口形成于通气杆侧面；紧固件,其将密封板固定于焊件的贯穿孔处；所述密封垫覆盖贯穿孔,所述注气通道的出气口置于焊件型腔内。本发明的气密试漏用密封工装,结构简单,可以对焊件进行气密试漏检验,且无需像油密试漏、水密试漏需要长时间的静置,检验周期短,能极大的提高试漏检验效率,具有结构简单、设计合理、易于制造的优点。(The invention discloses a sealing tool for airtight leakage test and a leakage test method, and belongs to the technical field of weldment performance detection. The sealing tool comprises a sealing plate, wherein the sealing plate is plate-shaped, a sealing gasket is formed on one end face in a protruding mode, and a yielding hole is formed in the end face of the sealing plate in a penetrating mode; the ventilation rod is matched with the abdication hole penetrating through the sealing plate, a gas injection channel is formed in the ventilation rod, and a gas outlet of the gas injection channel is formed in the side surface of the ventilation rod; a fastener for fixing the sealing plate to the through hole of the weldment; the sealing gasket covers the through hole, and the gas outlet of the gas injection channel is arranged in the weldment cavity. The sealing tool for airtight leakage testing is simple in structure, can be used for carrying out airtight leakage testing on a workpiece, does not need to be stood for a long time like oil-tight leakage testing and water-tight leakage testing, is short in testing period, can greatly improve the leakage testing efficiency, and has the advantages of being simple in structure, reasonable in design and easy to manufacture.)

1. The utility model provides an airtight leak test is with sealed frock which characterized in that includes:

the sealing plate is plate-shaped, a sealing gasket is convexly formed on one end face, and a yielding hole is formed in the end face of the sealing plate in a penetrating mode;

the ventilation rod is matched with the abdication hole penetrating through the sealing plate, a gas injection channel is formed in the ventilation rod, and a gas outlet of the gas injection channel is formed in the side surface of the ventilation rod;

a fastener for fixing the sealing plate to the through hole of the weldment;

the sealing gasket covers the through hole, and the gas outlet of the gas injection channel is arranged in the weldment cavity.

2. The hermetic leakage test sealing tool according to claim 1, characterized in that: the two sealing plates are symmetrically arranged.

3. The sealing tool for airtight leakage testing according to claim 2, wherein the ventilation bar comprises a first bar and a second bar;

the first rod piece is vertical to the second rod piece and is fixedly connected to one end part of the second rod piece, and the second rod piece penetrates through the abdicating hole in a matched mode; the side surface of the second rod piece is provided with threads;

the fastener is a bolt and is matched and screwed with the second rod piece.

4. The sealing tool for airtight leakage testing according to claim 3, further comprising a plug sleeved on the second rod, wherein the plug contacts with the abdicating hole to seal the abdicating hole.

5. The hermetic leakage test sealing tool according to claim 4, wherein: the number of the plugs is two, one plug is located between the fastening piece and one sealing plate closest to the fastening piece, and the other plug is located between the first rod piece and the other sealing plate closest to the first rod piece.

6. The hermetic leakage test sealing tool according to claim 5, wherein:

the abdicating hole is a conical hole, the aperture of one end of the abdicating hole close to the sealing gasket is small, and the aperture of one end of the abdicating hole far away from the sealing gasket is large;

the shape of the plug is matched with that of the abdicating hole.

7. An airtight leakage test method, based on the airtight leakage test sealing tool of claim 6, comprising the steps of:

sealing the through holes, namely sealing all the through holes on the weldment through a sealing tool, and arranging a gas injection channel gas outlet of a ventilation rod of the sealing tool in a weldment cavity;

injecting gas, wherein gas injection equipment is communicated with a gas injection channel, and 0.5MPa of compressed air is injected into the cavity of the weldment through the gas injection channel until the cavity is filled with the air;

and thirdly, leakage testing, namely smearing the soap liquid on a leakage testing position, and observing whether bubbles are generated at the leakage testing position.

8. The hermetic leak test method according to claim 7, wherein in the first step:

two sealing plates, two plugs, a ventilation rod and a fastener are correspondingly arranged in each through hole on the weldment;

when sealing, a sealing plate is respectively arranged at each through hole at two sides of the welding piece, a sealing gasket of the sealing plate covers the through hole, a plug is arranged at the abdicating hole of the sealing plate, then the second rod piece of the ventilation rod sequentially passes through the abdicating holes on the two sealing plates, and the fastening piece is screwed in and screwed on the end part of the second rod piece far away from the first rod piece.

Technical Field

The invention belongs to the technical field of weldment performance detection, and particularly relates to a sealing tool for airtight leakage testing and a leakage testing method.

Background

The press machine belongs to forging and pressing equipment and is widely applied to a plurality of fields of automobile manufacturing, engineering machinery, aerospace and the like, parts of the press machine are mostly made of welding parts, and welding seams of a plurality of parts have sealing requirements, for example, a top seat, a sliding block, a transmission case, a machine body oil tank, an air pipeline and the like of a large-scale machine tool.

The conventional welding leakage test method comprises a watertight leakage test method and an oil-tight leakage test method, wherein the watertight leakage test method comprises the steps of injecting water into a weldment, observing whether water drops leak out of a welding seam after standing for 24 hours, and performing the watertight leakage test again after repair welding if leakage points exist, so that the problems of long period and low efficiency exist; the oil-tight leakage test is to inject diesel oil or kerosene into a welding part cavity, and observe whether oil seeps out from a welding seam after standing for 24 hours, and also has the problems of long period and oil waste.

Therefore, how to effectively and quickly check the sealing performance of the welding seam on the welding piece is the key of the production efficiency and quality of the product.

Disclosure of Invention

In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided a sealing tool for airtight leakage testing, including:

the sealing plate is plate-shaped, a sealing gasket is convexly formed on one end face, and a yielding hole is formed in the end face of the sealing plate in a penetrating mode;

the ventilation rod is matched with the abdication hole penetrating through the sealing plate, a gas injection channel is formed in the ventilation rod, and a gas outlet of the gas injection channel is formed in the side surface of the ventilation rod;

a fastener for fixing the sealing plate to the through hole of the weldment;

the sealing gasket covers the through hole, and the gas outlet of the gas injection channel is arranged in the weldment cavity.

According to the sealing tool for airtight leakage testing, optionally, two sealing plates are arranged symmetrically.

According to the sealing tool for airtight leakage testing, optionally, the ventilation rod comprises a first rod piece and a second rod piece;

the first rod piece is vertical to the second rod piece and is fixedly connected to one end part of the second rod piece, and the second rod piece penetrates through the abdicating hole in a matched mode; the side surface of the second rod piece is provided with threads;

the fastener is a bolt and is matched and screwed with the second rod piece.

According to the sealing tool for airtight leakage testing, optionally, the sealing tool further comprises a plug which is sleeved on the second rod piece, and the plug is in contact with the abdicating hole to seal the abdicating hole.

According to the sealing tool for airtight leakage testing, optionally, the number of the plugs is two, one plug is located between the fastener and one sealing plate closest to the fastener, and the other plug is located between the first rod and the other sealing plate closest to the first rod.

According to the sealing tool for airtight leakage testing, optionally, the abdicating hole is a tapered hole, the aperture of the end, close to the sealing gasket, of the abdicating hole is small, and the aperture of the end, far away from the sealing gasket, of the abdicating hole is large;

the shape of the plug is matched with that of the abdicating hole.

According to another aspect of the invention, an airtight leakage test method is provided, and the airtight leakage test sealing tool based on the invention comprises the following steps:

sealing the through holes, namely sealing all the through holes on the weldment through a sealing tool, and arranging a gas injection channel gas outlet of a ventilation rod of the sealing tool in a weldment cavity;

injecting gas, wherein gas injection equipment is communicated with a gas injection channel, and 0.5MPa of compressed air is injected into the cavity of the weldment through the gas injection channel until the cavity is filled with the air;

and thirdly, leakage testing, namely smearing the soap liquid on a leakage testing position, and observing whether bubbles are generated at the leakage testing position.

According to the hermetic leakage test method of the embodiment of the present invention, optionally, in the first step:

two sealing plates, two plugs, a ventilation rod and a fastener are correspondingly arranged in each through hole on the weldment;

when sealing, a sealing plate is respectively arranged at each through hole at two sides of the welding piece, a sealing gasket of the sealing plate covers the through hole, a plug is arranged at the abdicating hole of the sealing plate, then the second rod piece of the ventilation rod sequentially passes through the abdicating holes on the two sealing plates, and the fastening piece is screwed in and screwed on the end part of the second rod piece far away from the first rod piece.

Advantageous effects

Compared with the prior art, the invention at least has the following beneficial effects:

(1) the sealing tool for airtight leakage testing is simple in structure, can be used for carrying out airtight leakage testing on a workpiece, does not need to be stood for a long time like oil-tight leakage testing and water-tight leakage testing, is short in testing period, and can greatly improve the leakage testing efficiency;

(2) the sealing tool for airtight leakage test can test leakage of welding pieces with multiple through holes, such as sliding block bodies, and the like, has a wide application range, can be repeatedly used, and saves cost;

(3) the sealing tool for airtight leakage test has good sealing effect on the through hole of the welding piece and high detectable rate of leakage test inspection;

(4) the airtight leakage test method is simple and rapid to operate and has popularization, a plurality of workpieces needing airtight treatment in a welding part of a press machine, including an air pipe in a stand column of a large machine tool, an oil tank in a cross beam, and the like, are manufactured into opposite sealing tools, and the airtight leakage test method can be adopted for inspection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

FIG. 1 is a schematic structural view of a sealing tool for airtight leakage testing according to the present invention;

FIG. 2 is a schematic view showing a structure of one side of a sealing plate according to the present invention;

FIG. 3 is a schematic view of the other side of the sealing plate and the plug of the present invention;

FIG. 4 is a schematic view showing the use of the sealing tool for airtight leakage testing according to the present invention;

FIG. 5 illustrates a flow chart of a leak testing method of the present invention;

reference numerals:

1. a sealing plate; 10. a gasket; 11. a hole of abdication;

2. a ventilation bar; 20. a first bar member; 21. a second bar member; 200. a gas injection channel;

3. a fastener;

4. a plug;

1000. welding parts; 1001. a through hole; 1002. and (6) leakage testing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

Example 1

The airtight leak test of this embodiment is with sealed frock includes:

the sealing plate comprises a sealing plate 1, a gasket 10 and a limiting hole 11, wherein the sealing plate 1 is plate-shaped, and the sealing plate 10 is convexly formed on one end face;

the ventilation rod 2 is matched with the abdication hole 11 penetrating through the sealing plate 1, a gas injection channel 200 is formed in the ventilation rod 2, and a gas outlet of the gas injection channel 200 is formed in the side surface of the ventilation rod 2;

a fastener 3 for fixing the sealing plate 1 to the through hole 1001 of the weldment 1000;

the sealing gasket 10 covers the through hole 1001, and the gas outlet of the gas injection channel 200 is arranged in the cavity of the weldment 1000.

When welding leakage test is performed on a welding part 1000, taking a slider body of a press as an example, as shown in fig. 4, the bottom of the slider body is provided with a plurality of through holes 1001 for use in fixed installation with other structural members, the through holes 1001 of the slider body are kidney-shaped holes penetrating through two opposite side surfaces of the slider body, a cavity is formed inside the slider body, a welding seam at an upper cover plate at the top of the slider body is a leakage test position 1002 which needs to be tested during leakage test, when the slider body works, accumulated oil easily drips above the upper cover plate, if the sealing property of the welding seam is poor, the oil leaks into the cavity and flows out of the kidney-shaped holes, the effective actions of the slider body and other structural members are affected, therefore, leakage test needs to be performed on the welding seam of the upper cover plate, for a conventional watertight leakage test method, water needs to be injected into the cavity, then the slider body is kept still for at least 24 hours, whether water beads seep out exists at the leakage test position 1002 is observed, the leakage test period is long, the efficiency is low, and the same defect also exists in the oil-tight leak test mode, and follow-up still need clear up the slider body, and traditional airtight leak test method is because there are many places through hole 1001 in slider body itself, is difficult to make the die cavity atmospheric pressure up to standard during airtight leak test, and the gas injection has the problem, to above-mentioned defect, this embodiment has carried out corresponding improvement.

As shown in fig. 2, the sealing plate 1 of the present embodiment is made of a steel plate, a gasket 10 is fixedly connected to one end surface of the steel plate, and the gasket 10 may be made of a flexible material such as a rubber pad, so that when the sealing plate 1 is fixed to the side wall of the through hole 1001 of the weldment 1000, the gasket 10 can cover the through hole 1001, and the tight contact area between the gasket 10 and the side wall of the weldment 1000 is ensured by the fastening force of the fastening member 3, so as to ensure the sealing effect on the through hole 1001.

In this embodiment, the abdicating hole 11 on the sealing plate 1 penetrates through two end faces of the sealing plate 1 and penetrates through the sealing gasket 10 on the sealing plate 1, and is formed in the middle of the end face of the sealing plate 1, when the sealing plate 1 covers the through hole 1001 of the sealing weldment 1000, the abdicating hole 11 is opposite to the through hole 1001, the ventilation bar 2 is matched to penetrate through the abdicating hole 11 and extend into the cavity, the ventilation bar 2 is provided with the gas injection channel 200, the gas inlet of the gas injection channel 200 is arranged on one end face of the ventilation bar 2, and the gas outlet is arranged on the side face of the ventilation bar 2, therefore, after the ventilation bar 2 extends into the cavity, the gas injection equipment is connected with the gas inlet of the gas injection channel 200, the gas outlet can inflate the cavity, and the through hole 1001 is sealed by the sealing plate 1, thereby the sealing condition of the gas tightness leakage test can be satisfied, the leakage test can be performed on the leakage test position 1002, specifically, the soap water can be coated at the welding seam of the upper cover plate, and whether bubbles appear or not can be observed, the leak test site 1002 can be determined for tightness.

The sealing tool for airtight leakage testing of the embodiment is simple in structure, can be used for airtight leakage testing of weldment 1000 with a plurality of through holes 1001 in the sliding block body and the like, and can greatly improve leakage testing efficiency.

Example 2

The sealing tool for airtight leakage testing is further improved on the basis of embodiment 1, and the two sealing plates 1 are symmetrically arranged.

Aiming at the structure that the through hole 1001 penetrates through two opposite side surfaces and a cavity of the weldment 1000, two sealing plates 1 are arranged, as shown in fig. 1, the through hole 1001 is symmetrically arranged on two sides of the weldment 1000 to seal the through hole 1001, and then the ventilation operation is carried out by sealing the yielding holes 11 on the two sealing plates 1 through a ventilation rod 2, so that the leakage test can be carried out.

In this embodiment, the thickness of the main steel plate part of the sealing plate 1 is 16mm, the steel plate is not too thick or too thin, the too thick steel plate occupies a large space and has a large weight, the operation difficulty in transportation and use is increased, the rigidity of the too thin steel plate is insufficient, and the possibility of deformation exists under the fastening of the fastening piece 3 to influence the sealing effect.

Further, the ventilation bar 2 comprises a first bar 20 and a second bar 21;

the first rod piece 20 is perpendicular to the second rod piece 21 and is fixedly connected to one end of the second rod piece 21, and the second rod piece 21 is matched and penetrates through the abdicating hole 11; the second rod 21 has threads formed on its side;

the fastener 3 is a bolt and is matched and screwed with the second rod piece 21.

As shown in fig. 1, the ventilation bar 2 is T-shaped, the middle portion of the first bar 20 is fixedly welded to an end portion of the second bar 21, the gas injection channel 200 is disposed on the second bar 21, wherein the gas inlet is disposed on an end surface of the second bar 21 far away from the first bar 20, and the gas outlet is disposed on a side surface of the middle portion of the second bar 21, when in use, the two sealing plates 1 are symmetrically disposed on two sides of the welding member 1000, the second bar 21 of the ventilation bar 2 sequentially passes through the abdicating holes 11 of the two sealing plates 1, then the fastening member 3 is screwed in from an end of the second bar 21 far away from the first bar 20, and the fastening member 3 fastens the first bar 20, the two sealing plates 1, and the welding member 1000 to each other, i.e. fastening is completed.

Further, the thread length of the side surface of the second rod 21 is set at one end of the second rod 21 far away from the first rod 20 according to the size of the weldment 1000, so that the intersection of the second rod 21 and the abdicating hole 11 is ensured to be free from thread, and the leakage test efficiency is prevented from being influenced by the seepage of gas from the intersection.

Example 3

The sealing tool for airtight leakage testing of the embodiment is further improved on the basis of the embodiment 2, and further comprises a plug 4 which is sleeved on the second rod piece 21, wherein the plug 4 is in contact with the abdicating hole 11 to seal the abdicating hole 11.

The cooperation department of ventilation pole 2 and hole of stepping down 11 produces gas pressure release easily at airtight leakage test in-process, can influence the test leak and examine efficiency, consequently, as shown in fig. 1, this embodiment has set up the clearance of 2 second member 21 of end cap 4 shutoff ventilation pole and hole of stepping down 11 to strengthen sealed effect.

Further, there are two plugs 4, one plug 4 is located between the fastening member 3 and one sealing plate 1 closest to the fastening member 3, and the other plug 4 is located between the first rod 20 and the other sealing plate 1 closest to the first rod 20.

The sealing tool structure for two sealing plates 1 is provided with two plugs 4, as shown in fig. 1, when the sealing tool is used, the two sealing plates 1 are respectively and symmetrically arranged at two sides of a weldment 1000, a second rod 21 of a ventilation rod 2 penetrates through the yielding holes 11 of the two sealing plates 1, one plug 4 is arranged between a first rod 20 and one adjacent sealing plate 1, the other plug 4 is arranged between a fastener 3 and the other adjacent sealing plate 1, and after the fastener 3 is screwed and fastened, the plug 4 completes the sealing of the gap corresponding to the yielding hole 11.

Preferably, the plug 4 of the present embodiment is an elastic plug such as a tendon plug, and after receiving a fastening force, the elastic plug can be sufficiently attached to and fitted in the gap of the receding hole 11, so as to enhance the sealing effect.

The airtight leakage test of this embodiment is with sealed frock, through end cap 4's setting, the sealed pad 10 structure of cooperation closing plate 1 can carry out effectual sealing to the through hole 1001 of weldment 1000 to avoid airtight leakage test in-process gas to reveal from through hole 1001, ensure that the detectable rate of leakage test inspection is high.

Example 4

The sealing tool for airtight leakage testing is further improved on the basis of embodiment 3, wherein the abdicating hole 11 is a tapered hole, the aperture of the end, close to the sealing gasket 10, of the abdicating hole 11 is small, and the aperture of the end, far away from the sealing gasket 10, of the abdicating hole 11 is large;

the shape of the plug 4 is matched with that of the abdicating hole 11.

As shown in fig. 3, in this embodiment, the tapered plug 4 is matched with the tapered abdicating hole 11, and the elastic structure of the tendon plug 4 is combined, so that the sealing effect on the gap of the abdicating hole 11 can be further strengthened after fastening.

Example 5

The hermetic leakage test method of the present embodiment, as shown in fig. 5, includes the following steps:

sealing the through holes, namely sealing all through holes 1001 on the weldment 1000 through a sealing tool, and placing an air outlet of an air injection channel 200 of an air vent rod 2 of the sealing tool in a cavity of the weldment 1000;

injecting gas, wherein gas injection equipment is communicated with a gas injection channel 200, and 0.5MPa of compressed air is injected into the cavity of the weldment 1000 through the gas injection channel 200 until the cavity is filled with the air;

and thirdly, leakage testing, namely smearing soap liquid on a leakage testing position 1002, and observing whether bubbles are generated at the leakage testing position 1002.

Taking the leakage test of the slide block body of the press as an example, the bottom of the slide block body is provided with three through holes 1001 in a waist shape, three groups of sealing tools are matched, each group of sealing tools comprises two sealing plates 1, two plugs 4, a ventilation rod 2 and a fastening piece 3, when the waist-shaped through holes 1001 are sealed, each through hole 1001 at two sides of the slide block body is respectively provided with one sealing plate 1, a sealing gasket 10 of each sealing plate 1 faces the through hole 1001 at the corresponding side and covers the through hole 1001, the plugs 4 are uniformly arranged at the yielding holes 11 of each sealing plate 1, then a second rod piece 21 of the ventilation rod 2 sequentially passes through the yielding holes 11 on the two sealing plates 1, the fastening piece 3 is screwed into the end part of the second rod piece 21 far away from the first rod piece 20 and covers the through hole 1001, the plugs 4 are tightly embedded in the gaps at the yielding holes 11 under the fastening limit of the first rod piece 20 and the fastening piece 3, the sealing gasket 10 is tightly attached to the side wall of the welding piece 1000 at the through holes 1001, thereby forming an effective seal for each penetration hole 1001; then the gas injection equipment is communicated with a gas inlet of the gas injection channel 200, and 0.5MPa of air is injected into the cavity of the weldment 1000 until the cavity is filled with the air; then smearing soap liquid on a leakage test position 1002, wherein the leakage test position 1002 of the slider body is a welding seam of the upper cover plate, observing that no bubble is generated on the leakage test position 1002, if the bubble appears and the sealing performance of the welding seam at the position does not reach the standard, removing the welding seam by using a carbon rod, welding and polishing, performing airtight leakage test again after repair welding, and if no bubble exists, determining that the sealing performance of the welding seam is qualified; and after the leakage test is finished, screwing out the fastener 3 and dismantling the sealing tool.

The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.