Device for detecting static air tightness of rubber oil seal

Abstract

The invention relates to the technical field of rubber oil seal air tightness detection, and discloses a rubber oil seal static air tightness detection device which comprises a base, first supporting seats are fixedly installed on the top of the base, an air tightness detection box cylinder is fixedly installed between the first supporting seats, and a control instrument is further fixedly installed on the top of the base. A second supporting seat is further fixedly installed on the top of the base. According to the invention, the inner U-shaped rubber oil seal is designed, and the rubber raised head and the rubber fin are designed on the inner U-shaped rubber oil seal, so that when the shaft head on the test shaft body is in full contact with the inner U-shaped rubber oil seal, the rubber raised head and the rubber fin are extruded, thereby better enabling the binding surface of the shaft head and the inner U-shaped rubber oil seal to be tightly attached and pressed; and the phenomena that small gaps are formed between the test shaft wall and the rubber oil seal, and when the small gaps rotate at a high speed for a long time, the small gaps are gradually increased, so that air flows, and the air tightness performance of the rubber oil seal is reduced are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of rubber oil seal air tightness detection, in particular to a device for static air tightness detection of rubber oil seals. Background Art

[0002] The rubber oil seal is an annular cover composed of one or more parts, which is fixed on a ring or washer of the bearing and contacts with another ring or washer or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the intrusion of foreign objects.

[0003] Rubber products are widely used in various industrial fields, and their sealing performance is one of the important indicators to ensure product quality. In order to improve the reliability and stability of products, it is necessary to test the airtightness of rubber products. In the existing technology, airtightness testing can evaluate the airtightness of rubber products. The method is usually a pressure test. The pressure test fixes the rubber product in a pressurized chamber and exposes it to a pressure exceeding atmospheric pressure to observe whether leakage occurs. If there is a leak, it needs to be repaired and tested until there is no leakage.

[0004] In response to the defects of the above test methods, China Patent Publication No. CN220063309U discloses a device for static air tightness detection of rubber oil seals, including a base, a slide plate and a fixed plate, wherein the slide plate is slidably arranged on one side of the upper surface of the base, and the fixed plate is fixedly connected to the other side of the upper surface of the base; a test shaft is rotatably arranged on one side of the slide plate close to the fixed plate, and a wind force detection mechanism is slidably arranged on the periphery of the test shaft close to the left and right; a detection cylinder is fixedly connected to one side of the fixed plate close to the slide plate, and an air pump connected to the detection cylinder is fixedly connected to the other side of the fixed plate. Through the setting of the test shaft, both static and dynamic air tightness detection can be performed. When the rubber oil seal seals two relatively rotating entities, dynamic air tightness detection can be performed through the rotation of the test shaft, which effectively ensures the air tightness of the rubber oil seal, improves the scope of application of air tightness detection, and improves the use efficiency.

[0005] In the process of dynamic air tightness test of rubber oil seal, when the test shaft rotates relative to the rubber oil seal, there will be a small gap between the test shaft wall and the rubber oil seal. When this small gap rotates at high speed for a long time, it will gradually increase, causing air to flow and the air tightness performance of the rubber oil seal to decrease. For this reason, we provide a device for static air tightness test of rubber oil seal. Summary of the invention

[0006] The object of the present invention is to provide a device for detecting the static air tightness of a rubber oil seal to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: a device for static air tightness detection of rubber oil seals, comprising a base, a support seat 1 is fixedly installed on the top of the base, an air tightness detection box tube is fixedly installed between the support seats 1, a control instrument is also fixedly installed on the top of the base, a support seat 2 is also fixedly installed on the top of the base, driving components are arranged on both sides of the air tightness detection box tube, and a test component is arranged inside the air tightness detection box tube; The driving assembly specifically includes: a driving motor, which is fixedly mounted on the top of the supporting base 2 and located on the left side of the air tightness detection box tube; an air pump, which is fixedly mounted on the top of the base and located on the right side of the air tightness detection box tube; The test assembly specifically includes: an integrated cover, which is integrally connected to the right side of the airtightness detection box tube and forms an air pressure chamber with the interior of the airtightness detection box tube. The integrated cover is provided with an air pressure measuring instrument electrically connected to the control instrument.

[0008] Preferably, the output end of the driving motor is fixedly connected to an electric telescopic rod, the telescopic end of the electric telescopic rod is fixedly connected to a test shaft body, and the shaft end of the test shaft body is integrally connected to a shaft head; the output end of the air pump is connected to an air connecting pipe, and the other end of the air connecting pipe is connected to the integrated cover.

[0009] Preferably, the driving motor and the air pump are both electrically connected to the control instrument.

[0010] Preferably, a partition is fixedly installed inside the air pressure chamber, two sealed bearings are installed inside the air pressure chamber, and a sealing installation assembly is arranged between the two sealed bearings.

[0011] Preferably, the shaft head on the test shaft body rotates in the airtightness detection box barrel through a sealed bearing.

[0012] Preferably, a threaded groove is provided on the left side of the interior of the air pressure chamber, and a threaded sealing cover is threadedly connected to the threaded groove, and anemometers electrically connected to a control instrument are equidistantly arranged on the circumference of the threaded sealing cover.

[0013] Preferably, the sealing installation assembly specifically includes: an air flow guide ring cover, which is located between the two sealing bearings and is integrally installed inside the air pressure chamber; and a rubber plastic part, which is made of soft silicone material and is in a ring-shaped opening.

[0014] Preferably, the inner wall of the air guide ring cover is integrally connected with a ring body, and a plurality of groups of air stop plates are integrally connected with the circumference of both sides of the outer wall of the ring body at equal intervals, and a strip body is integrally connected with the ring body between the air stop plates; inner stepped cams are integrally connected with the two sides of the strip body, and a stop plate is integrally connected with the inner side of the inner stepped cam; an embedding groove is formed between the strip body, the inner stepped cam and the stop plate; an embedding foot head is integrally connected with the interior of the rubber plastic part, and the embedding foot head is slidably assembled with the embedding groove.

[0015] Preferably, the inner wall of the rubber plastic part is provided with a fitting groove, and an inner U-shaped rubber oil seal is built in the fitting groove, a rubber boss is integrally connected to the middle position of the inner wall of the inner U-shaped rubber oil seal, and rubber fins are integrally connected to both sides of the outer wall of the inner U-shaped rubber oil seal; the fitting surface of the fitting groove and the inner U-shaped rubber oil seal is evenly coated with adhesive, and the adhesive is optically transparent adhesive or liquid optically transparent adhesive.

[0016] The present invention provides a device for detecting static air tightness of a rubber oil seal, which has the following beneficial effects: (1) The present invention designs an air guide ring cover, which is made of elastic silicone material. This facilitates the contact between the fitting surfaces of the air guide ring cover and the shaft head during the insertion of the shaft head on the test shaft body into the air guide ring cover, thereby providing auxiliary assistance for achieving a sealing fit between the test shaft wall and the rubber oil seal.

[0017] (2) The present invention designs an inner U-shaped rubber oil seal on which rubber bosses and rubber fins are designed. When the shaft head on the test shaft body is in full contact with the inner U-shaped rubber oil seal, the rubber bosses and rubber fins are squeezed, thereby better making the shaft head and the fitting surface of the inner U-shaped rubber oil seal tightly pressed, avoiding the presence of a small gap between the test shaft wall and the rubber oil seal. When such a small gap is rotated at high speed for a long time, it will cause the small gap to gradually increase, resulting in air flow and the phenomenon of reduced air tightness performance of the rubber oil seal.

[0018] (3) The present invention pre-bonds the inner U-shaped rubber oil seal in the fitting groove, and pre-engages the embedded foot head provided in the rubber plastic part from the reserved groove between the multiple groups of inner stepped cams in a sliding and rotating manner so that the embedded foot head is snap-fitted into the embedding groove. The full bonding process uses OCA optical transparent glue or liquid optical transparent glue to seamlessly bond the inner U-shaped rubber oil seal and the fitting groove together, eliminating the air layer therebetween, thereby facilitating the effect of static and dynamic air tightness testing of the rubber oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front cross-sectional view of the airtightness detection box tube of the present invention; Figure 3 This is a structural view of the test assembly of the present invention; Figure 4 This is a structural view of the sealing installation assembly of the present invention; Figure 5 For the present invention Figure 4 A magnified view of center.

[0020] In the figure: 111 base, 112 support seat 1, 113 air tightness detection box tube, 114 control instrument, 115 support seat 2, 2 drive assembly, 211 drive motor, 212 electric telescopic rod, 213 test shaft, 214 shaft head, 215 air pump, 216 air pipe, 3 test assembly, 311 integrated cover, 312 air pressure chamber, 313 partition, 314 sealed bearing, 315 threaded groove, 316 threaded sealing cover, 317 anemometer, 318 air pressure gauge, 4 sealing installation assembly, 411 air flow guide ring cover, 412 ring body, 413 air stop plate, 414 strip body, 415 inner stepped cam, 416 stop plate, 421 rubber plastic part, 422 embedded foot head, 423 inner U-shaped rubber oil seal, 424 rubber cam, 425 rubber fin. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment 1: A preferred embodiment of a static air tightness detection device for a rubber oil seal provided by the present invention is as follows Figure 1-5As shown: a static air tightness detection device for rubber oil seals, comprising a base 111, a support base 112 is fixedly installed on the top of the base 111, an air tightness detection box tube 113 is fixedly installed between the support bases 112, a control instrument 114 is also fixedly installed on the top of the base 111, a support base 2 115 is also fixedly installed on the top of the base 111, a driving assembly 2 is arranged on both sides of the air tightness detection box tube 113, and a test assembly 3 is arranged inside the air tightness detection box tube 113; The driving assembly 2 specifically includes: a driving motor 211, which is fixedly mounted on the top of the supporting seat 115 and is located on the left side of the airtightness detection box tube 113; an air pump 215, which is fixedly mounted on the top of the base 111 and is located on the right side of the airtightness detection box tube 113; an output end of the driving motor 211 is fixedly connected to an electric telescopic rod 212, and the telescopic end of the electric telescopic rod 212 is fixedly connected to a test shaft body 213, and the shaft end of the test shaft body 213 is integrally connected to a shaft head 214; an output end of the air pump 215 is connected to an air connection pipe 216, and the other end of the air connection pipe 216 is connected to the integrated cover 311; the driving motor 211 and the air pump 215 are both electrically connected to the control instrument 114; Furthermore, in the present embodiment, the power supply is started, and the electric telescopic rod 212 drives the test shaft body 213 to move into the air tightness detection box barrel 113 until the shaft head 214 on the test shaft body 213 is inserted into the integrated cover 311, so that the shaft head 214 rotates in the air tightness detection box barrel 113 through the sealing bearing 314, and at this time, the threaded sealing cover 316 is installed in the threaded groove 315 (sealing treatment is performed between the threaded sealing cover 316 and the test shaft body 213), and the driving motor 211 is started, and the driving motor 211 finally drives the shaft head on the test shaft body 213 to rotate.

[0025] Embodiment 2: Based on Embodiment 1, a preferred embodiment of a static air tightness detection device for a rubber oil seal provided by the present invention is as follows: Figure 1-5 As shown: The test assembly 3 specifically includes: an integrated cover 311, which is integrally connected to the right side of the airtightness detection box tube 113, and forms an air pressure chamber 312 with the inside of the airtightness detection box tube 113, and an air pressure measuring instrument 318 electrically connected to the control instrument 114 is provided on the integrated cover 311; A partition 313 is fixedly installed inside the air pressure chamber 312, two sealing bearings 314 are installed inside the air pressure chamber 312, and a sealing installation component 4 is arranged between the two sealing bearings 314; the shaft head 214 on the test shaft body 213 rotates in the air tightness detection box tube 113 through the sealing bearing 314; A thread groove 315 is provided on the left side of the air pressure chamber 312, and a threaded sealing cover 316 is threadedly connected to the thread groove 315. Anemometers 317 electrically connected to the control instrument 114 are equidistantly arranged on the circumference of the threaded sealing cover 316. Furthermore, in this embodiment, the anemometer 317 detects in real time whether there is gas being discharged from the rubber oil seal, and feeds back the signal to the control instrument 114, thereby determining the air tightness of the rubber oil seal.

[0026] Furthermore, in this embodiment, the air pressure measuring instrument 318 can monitor the changes in the air pressure in the air pressure chamber 312 in real time, and during the experimental test, it can be used in conjunction with the air pump 215 to perform quantitative air supply or extraction.

[0027] Embodiment 3: Based on Embodiments 1 and 2, a preferred embodiment of a static air tightness detection device for a rubber oil seal provided by the present invention is as follows: Figure 1-5 As shown: the sealing installation assembly 4 specifically includes: an air flow guide ring cover 411, which is located between the two sealing bearings 314 and is integrally installed inside the air pressure chamber 312; a rubber plastic part 421, which is made of soft silicone material and is in a ring-shaped opening; The inner wall of the air guide ring cover 411 is integrally connected with a ring body 412, and multiple groups of air stop plates 413 are integrally connected to the outer wall of the ring body 412 at equal intervals, and a strip body 414 is integrally connected to the ring body 412 located between the air stop plates 413; inner stepped cams 415 are integrally connected to the two sides of the strip body 414, and a stop plate 416 is integrally connected to the inner side of the inner stepped cam 415; an embedding groove is formed between the strip body 414, the inner stepped cam 415, and the stop plate 416; wherein, a reserved groove is formed between the multiple groups of inner stepped cams 415, so that the embedding foot 422 can be smoothly engaged and embedded in the embedding groove; The rubber plastic part 421 is integrally connected with an embedded foot head 422, which is slidably fitted with the embedded groove; the inner wall of the rubber plastic part 421 is provided with a fitting groove, and an inner U-shaped rubber oil seal 423 is built in the fitting groove, a rubber protrusion 424 is integrally connected at the middle position of the inner wall of the inner U-shaped rubber oil seal 423, and both sides of the outer wall of the inner U-shaped rubber oil seal 423 are integrally connected with rubber fins 425; The bonding surface between the bonding groove and the inner U-shaped rubber oil seal 423 is evenly coated with adhesive, and the adhesive is optically transparent adhesive or liquid optically transparent adhesive.

[0028] Furthermore, in this embodiment, by designing the air guide ring cover 411, the air guide ring cover 411 is made of elastic silicone material, so that when the shaft head 214 on the test shaft body 213 is inserted into the air guide ring cover 411, the fitting surfaces between the air guide ring cover 411 and the shaft head 214 contact each other until the shaft head 214 rotates in the air tightness detection box tube 113 through the sealing bearing 314.

[0029] Furthermore, in this embodiment, by designing an inner U-shaped rubber oil seal 423, a rubber boss 424 and a rubber fin 425 are designed thereon. When the shaft head on the test shaft body 213 is in full contact with the inner U-shaped rubber oil seal 423, the rubber boss 424 and the rubber fin 425 are squeezed, thereby better making the shaft head and the fitting surface of the inner U-shaped rubber oil seal 423 fit tightly.

[0030] Working principle: when in use, the inner U-shaped rubber oil seal 423 is pre-bonded in the fitting groove, and the embedded foot head 422 provided in the rubber plastic part 421 is pre-engaged in the embedded groove by sliding and rotating from the reserved groove between the multiple groups of inner stepped cams 415. The full bonding process uses OCA optical transparent glue or liquid optical transparent glue to bond the inner U-shaped rubber oil seal 423 and the fitting groove together without gaps, eliminating the air layer between them; the bonding process is: align the inner U-shaped rubber oil seal 423 and the fitting groove to ensure that the position between the two is accurate, pre-bond at a certain temperature and pressure to make the adhesive initially solidify, but not fully solidify and fully bond, and at a higher temperature and pressure, the inner U-shaped rubber oil seal 423 and the fitting groove are fully bonded to ensure that the adhesive fully fills the small gap between the two; the adhesive is fully solidified by ultraviolet (UV) irradiation, heating or other curing methods to achieve the best bonding effect; Then carry out static and dynamic air tightness tests on rubber oil seals respectively; First, the static air tightness test of the rubber oil seal is performed. At the beginning of the test, the air pump 215 is started to quantitatively input gas into the air tightness test box 113 to increase the air pressure in the air tightness test box 113. The air pressure measuring instrument 318 can monitor the change of the air pressure in the air pressure chamber 312 in real time. At this time, the wind speed measuring instrument 317 is used to detect whether there is gas being led out from the rubber oil seal to determine the static air tightness of the rubber oil seal. Several experimental tests are performed and recorded to accurately detect the static air tightness performance of the rubber oil seal. Then, the dynamic air tightness test of the rubber oil seal is performed. At the beginning of the test, the air pump 215 is first started to quantitatively output the gas in the air tightness test box barrel 113 until the air pressure chamber 312 is in a vacuum state. Then, the power supply is started, and the electric telescopic rod 212 drives the test shaft body 213 to move into the air tightness test box barrel 113 until the shaft head 214 on the test shaft body 213 is inserted into the air guide ring cover 411, so that the shaft head 214 rotates in the air tightness test box barrel 113 through the sealing bearing 314. At this time, the threaded sealing cover 31 6 is installed in the thread groove 315 (seal treatment is performed between the thread sealing cover 316 and the test shaft body 213), and the driving motor 211 is started. The driving motor 211 finally drives the shaft head on the test shaft body 213 to rotate. The air pressure change in the air pressure chamber 312 can be monitored in real time through the air pressure measuring instrument 318, and at this time, the wind speed measuring instrument 317 is used to detect whether there is gas being led out from the rubber oil seal to determine the dynamic air tightness of the rubber oil seal. Several experimental tests are performed and recorded to accurately detect the dynamic air tightness performance of the rubber oil seal.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting static air tightness of a rubber oil seal, comprising a base (111), characterized in that: A support seat 1 (112) is fixedly mounted on the top of the base (111), an airtightness detection box tube (113) is fixedly mounted between the support seats 1 (112), a control instrument (114) is also fixedly mounted on the top of the base (111), a support seat 2 (115) is also fixedly mounted on the top of the base (111), driving components (2) are arranged on both sides of the airtightness detection box tube (113), and a test component (3) is arranged inside the airtightness detection box tube (113); The driving component (2) specifically comprises: A driving motor (211) is fixedly mounted on the top of the second support seat (115) and is located on the left side of the airtightness detection box tube (113); An air pump (215) is fixedly mounted on the top of the base (111) and is located on the right side of the air tightness detection box tube (113); The test component (3) specifically includes: The integrated cover (311) is integrally connected to the right side surface of the airtightness detection box tube (113) and forms an air pressure chamber (312) with the interior of the airtightness detection box tube (113). The integrated cover (311) is provided with an air pressure measuring instrument (318) electrically connected to the control instrument (114).

2. The device for detecting static air tightness of a rubber oil seal according to claim 1, characterized in that: The output end of the driving motor (211) is fixedly connected to an electric telescopic rod (212), the telescopic end of the electric telescopic rod (212) is fixedly connected to a test shaft body (213), and the shaft end of the test shaft body (213) is integrally connected to a shaft head (214); the output end of the air pump (215) is connected to an air connection pipe (216), and the other end of the air connection pipe (216) is connected to the integral cover (311).

3. The device for detecting static air tightness of a rubber oil seal according to claim 1, characterized in that: The driving motor (211) and the air pump (215) are both electrically connected to the control instrument (114).

4. The device for detecting static air tightness of a rubber oil seal according to claim 1, characterized in that: A partition plate (313) is fixedly installed inside the air pressure chamber (312), two sealing bearings (314) are installed inside the air pressure chamber (312), and a sealing installation component (4) is arranged between the two sealing bearings (314).

5. The device for detecting static air tightness of a rubber oil seal according to claim 2, characterized in that: The shaft head (214) on the test shaft body (213) rotates in the airtightness detection box tube (113) via a sealed bearing (314).

6. The device for detecting static air tightness of a rubber oil seal according to claim 1, characterized in that: A threaded groove (315) is provided on the left side of the interior of the air pressure chamber (312), and a threaded sealing cover (316) is threadedly connected to the threaded groove (315). Wind speed measuring instruments (317) electrically connected to the control instrument (114) are equidistantly arranged on the circumference of the threaded sealing cover (316).

7. The device for detecting static air tightness of a rubber oil seal according to claim 4, characterized in that: The sealing installation assembly (4) specifically comprises: An air flow guide ring cover (411) is located between the two sealing bearings (314) and is integrally installed inside the air pressure chamber (312); The rubber plastic part (421) is made of soft silicone material and is in a ring-shaped opening shape.

8. The device for detecting static air tightness of a rubber oil seal according to claim 7, characterized in that: The inner wall of the air flow guide ring cover (411) is integrally connected with a ring body (412), and the outer wall of the ring body (412) is integrally connected with a plurality of groups of air stop plates (413) at equal intervals on both sides of the circumference, and a strip body (414) is integrally connected to the ring body (412) located between the air stop plates (413); The two sides of the strip-shaped body (414) are integrally connected with inner stepped cams (415), and the inner side of the inner stepped cams (415) is integrally connected with a stop plate (416); an embedding groove is formed between the strip-shaped body (414), the inner stepped cams (415) and the stop plate (416); An embedded foot head (422) is integrally connected to the interior of the rubber plastic part (421), and the embedded foot head (422) is slidably embedded in the embedding groove.

9. The device for detecting static air tightness of a rubber oil seal according to claim 7, characterized in that: The inner wall of the rubber plastic part (421) is provided with a fitting groove, and an inner U-shaped rubber oil seal (423) is built in the fitting groove; a rubber protrusion (424) is integrally connected to the middle position of the inner wall of the inner U-shaped rubber oil seal (423); and rubber fins (425) are integrally connected to both sides of the outer wall of the inner U-shaped rubber oil seal (423); The bonding surface of the bonding groove and the inner U-shaped rubber oil seal (423) is evenly coated with adhesive, and the adhesive is optically transparent adhesive or liquid optically transparent adhesive.

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