Aluminum alloy product leak detection system

Abstract

The invention relates to the technical field of compressor processing, and discloses an aluminum alloy product leak detection system, which comprises a supporting and bearing mechanism, a top plugging unit is slidably arranged on the supporting and bearing mechanism, a vacuum lifting unit is slidably arranged on the top plugging unit, the vacuum lifting unit comprises a vacuum cover and a lifting part, and the lifting part can drive the vacuum cover to lift. The top plugging unit is used for sealing the top of the shell and the top of the vacuum cover; a lateral blocking unit and a gas path detection unit are further arranged on the supporting and bearing mechanism, the lateral blocking unit is used for blocking the side face of the shell and the side face of the vacuum cover, and the gas path detection unit is used for filling high-pressure gas into the shell, pumping out the gas in the vacuum cover and detecting the pressure change between the shell and the vacuum cover. According to the technical scheme, the precision and reliability of shell air tightness detection can be improved, interference of external environment factors on the detection process is reduced, and meanwhile energy consumption and cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressor processing, and in particular to a leak detection system for aluminum alloy products. Background Art

[0002] In modern manufacturing, aluminum alloys are widely used in the field of compressor housing manufacturing due to their light weight, good strength, good corrosion resistance and excellent processing performance. However, during the casting process of the compressor housing, due to the influence of the characteristics of the aluminum alloy itself and the casting process, defects such as pores and looseness are prone to occur. These defects seriously damage the airtightness of the housing and bury hidden dangers for the quality and performance of the product.

[0003] The existing compressor housing leak detection system usually installs the housing on the leak detection system, blocks the bottom, top and sides of the housing, thereby forming a closed space inside the housing, and then injects 3MPa high-pressure gas into the housing. After that, it only relies on the pressure sensor set in the housing to monitor the pressure change to determine whether there is a leak. However, this leak detection system has significant disadvantages: First, in terms of detection accuracy, the ability of relying solely on the internal pressure sensor to detect tiny leaks is insufficient. In actual production, tiny leaks are often difficult to be effectively detected, which makes it easy for housings with potential airtightness problems to be misjudged as qualified products, which in turn has a great negative impact on the performance and service life of the compressor; second, the system is easily affected by external environmental factors. Since the outside of the housing is in direct contact with the surrounding gas, during the detection period, factors such as atmospheric pressure fluctuations, ambient temperature changes, and gas flow will interfere with the detection results, greatly reducing the accuracy and reliability of the detection; third, this leak detection system requires the injection of 3MPa high-pressure gas into the housing, which undoubtedly puts higher requirements on the pressure performance of the gas supply equipment, which not only increases the equipment cost, but also leads to increased energy consumption. Summary of the invention

[0004] The present invention aims to provide an aluminum alloy product leak detection system to improve the accuracy and reliability of shell air tightness detection, reduce the interference of external environmental factors on the detection process, and reduce energy consumption and cost.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a leak detection system for aluminum alloy products, including a supporting and bearing mechanism, a top sealing unit is slidably arranged on the supporting and bearing mechanism, a vacuum lifting unit is slidably arranged on the bottom sealing unit, the vacuum lifting unit includes a vacuum cover and a lifting part, the lifting part can drive the vacuum cover to rise and fall, and the top sealing unit is used to seal the top of the shell and the top of the vacuum cover; the supporting and bearing mechanism also has a lateral sealing unit and an air path detection unit, the lateral sealing unit is used to seal the side of the shell and the side of the vacuum cover, and the air path detection unit is used to fill the shell with high-pressure gas, and can extract the gas in the vacuum cover to detect the pressure change between the shell and the vacuum cover.

[0006] The beneficial effects of this scheme are as follows: when detecting whether the leakage of the shell exceeds the standard, the shell is first placed on the supporting bearing mechanism, and the bottom of the shell is sealed by the supporting bearing mechanism, and then the top of the shell is sealed by the top blocking unit to achieve the sealing of the upper and lower ends of the shell. Subsequently, the lifting part drives the vacuum hood to descend and sets its hood outside the shell. At this time, the top of the vacuum hood is tightly fitted with the top surface of the top blocking unit to complete the sealing of the top of the vacuum hood. At the same time, the bottom of the vacuum hood is sealed by the supporting bearing mechanism to ensure the sealing of the upper and lower ends of the vacuum hood; then, the side of the shell and the side of the vacuum hood are sealed by the lateral blocking unit, thereby constructing an independent closed space inside the shell, and a closed interval is also formed between the shell and the vacuum hood. Thereafter, the high-pressure gas is filled into the shell by the ventilation detection unit, and the gas in the vacuum hood is extracted, thereby creating a negative pressure state in the vacuum hood. After the inflation and exhaust processes are completed, the pressure change between the vacuum hood and the shell is detected to accurately determine whether the leakage of the shell exceeds the standard.

[0007] Detect the pressure change between the vacuum cover and the shell to determine whether the shell leakage exceeds the standard. Given the pressure difference between the shell and the vacuum cover, even a small leak will cause the pressure difference between the two to change, thereby greatly improving the detection accuracy and effectively reducing the possibility of missing small leaks. It can accurately detect extremely subtle leaks and effectively avoid the misjudgment problem caused by insufficient detection accuracy of traditional leak detection systems.

[0008] This technical solution effectively isolates the direct impact of external environmental factors on the detection process by constructing a closed area between the shell and the vacuum cover. Compared with the situation in which the shell is directly in contact with the external gas in the traditional leak detection system, the present invention greatly reduces the interference of factors such as atmospheric pressure fluctuations, ambient temperature changes, and gas flow on the detection results, making the detection data more stable and reliable. This not only improves the accuracy of a single test, but also maintains the consistency and repeatability of the test results in the long-term production test process, providing a solid guarantee for the stable control of product quality.

[0009] Due to the setting of the vacuum cover, this technical solution can extract the internal gas to form a negative pressure environment. In this way, during the detection process, there is no need to inject excessively high-pressure gas into the shell to meet the detection needs, which allows enterprises to save a lot of costs in the purchase and maintenance of gas supply equipment. There is no need to equip high-performance, high-pressure gas supply equipment, which reduces the initial investment of the equipment, and also reduces the energy consumption and maintenance costs of the equipment during operation, improves the economic benefits and market competitiveness of the enterprise, and meets the requirements of sustainable development and cost control of modern manufacturing industry.

[0010] Furthermore, an air intake channel and an air exhaust channel are provided on the supporting bearing mechanism, and the air path detection unit includes an air source and an air exhaust device, the air source is connected with an air intake pipe, on which a pneumatic valve, a No. 1 pressure gauge and a No. 1 one-way valve are installed in sequence, the free end of the air intake pipe is connected with the air intake channel, the air intake pipe between the pneumatic valve and the No. 1 pressure gauge is connected with an exhaust pipe, on which an exhaust valve is installed; the air exhaust device is connected with an air exhaust pipe, on which a No. 2 pressure gauge and a No. 2 one-way valve are installed in sequence, the free end of the air exhaust pipe is connected with the air exhaust channel, a differential pressure sensor is connected in parallel between the air intake pipe and the air exhaust pipe, and the differential pressure sensor is located between the No. 1 one-way valve and the shell.

[0011] The beneficial effects of this solution are as follows: by setting a No. 1 pressure gauge on the air intake pipe and a No. 2 pressure gauge on the air exhaust pipe, this technical solution enables the operator to control the pressure conditions of the air intake and air exhaust process in real time and intuitively, so as to accurately grasp the pressure parameters of gas input and extraction, and ensure that the detection process is carried out under a stable and appropriate pressure environment, which not only improves the accuracy and repeatability of the detection, but also effectively avoids the deviation of the detection result caused by abnormal pressure. Secondly, the differential pressure sensor can accurately measure the pressure difference between the shell and the vacuum cover. It has a keen ability to capture tiny pressure changes. Even the pressure difference change caused by extremely small leaks can be fed back in time, which greatly improves the detection accuracy, minimizes the risk of missed detection, and effectively ensures the reliability of product air tightness detection. Furthermore, the installation of the pneumatic valve provides convenience for the operator, so that it can flexibly control the inflation operation of the gas source into the shell according to the actual detection needs, and easily realize opening or closing, which enhances the controllability of the entire detection process and improves the convenience of operation.

[0012] Furthermore, the pressure of the high-pressure gas injected into the shell is 1-2 MPa.

[0013] The beneficial effects of this solution are: compared with the traditional leak detection system that needs to inject 3MPa high-pressure gas, this solution sets the high-pressure gas pressure in the shell to 1-2MPa. This pressure requirement effectively reduces the pressure performance requirements for gas supply equipment, thereby enabling enterprises to save a lot of money in the purchase, maintenance and operation costs of gas supply equipment, not only reducing the initial investment in equipment, but also reducing subsequent energy consumption and maintenance costs, greatly improving the economic benefits and market competitiveness of enterprises. At the same time, the lower inflation pressure also reduces the safety risks caused by high-pressure gas during the detection process to a certain extent, such as gas leakage, container rupture and other hidden dangers are reduced, which effectively improves the safety of the detection working environment, reduces the probability of safety accidents, and effectively guarantees the personal safety of operators and the normal operation of equipment.

[0014] Furthermore, the supporting and bearing mechanism includes a supporting unit and a bearing and sealing unit. The supporting unit includes a top plate, a supporting plate and a plurality of supporting columns. The top plate and the supporting plate are connected through the supporting columns. The bearing and sealing unit is arranged on the supporting plate.

[0015] The beneficial effects of this solution are as follows: the support unit structure provided by this technical solution is stable, and the support column connects the top plate and the support plate, which can effectively disperse the pressure, provide stable support for detection, prevent the equipment from displacement and deformation, and ensure accurate detection. At the same time, its structure is simple, easy to manufacture, assemble and maintain, reduce costs, and improve equipment versatility and production efficiency.

[0016] Furthermore, the bearing sealing unit includes a mounting plate, which is detachably connected to the support plate, and a ventilation plate is detachably connected to the top of the mounting plate, and a positioning seat is sealingly connected to the ventilation plate. A No. 1 sealing ring and a No. 2 sealing ring are provided on the ventilation plate, and the No. 1 sealing ring and the No. 2 sealing ring are concentrically arranged with the positioning seat.

[0017] The beneficial effects of this solution are as follows: In this technical solution, since the mounting plate and the support plate are connected in a detachable manner, this greatly facilitates the replacement operation of the load-bearing sealing unit, so that it can flexibly adapt to the detection requirements of different types of shells, effectively improving the versatility and adaptability of the equipment. At the same time, the No. 1 sealing ring and the No. 2 sealing ring are concentrically arranged with the positioning seat, which can ensure that uniform and stable sealing conditions are constructed around the positioning seat, effectively preventing gas from leaking around the positioning seat, and thus significantly enhancing the sealing efficiency of the entire load-bearing sealing unit, providing a solid guarantee for the accuracy and reliability of the detection work, reducing the detection error and leakage risk caused by poor sealing, and ensuring that the detection process can be carried out stably and efficiently to meet the requirements of a variety of shell detection tasks.

[0018] Furthermore, the top sealing unit includes a No. 1 driving member, a connecting plate, a push plate and a plurality of connecting columns. The No. 1 driving member is installed on the top of the top plate, and its output shaft passes through the top plate and is detachably connected to the connecting plate. The connecting plate and the push plate are fixedly connected through the connecting columns. The push plate is slidably arranged on the support columns. The push plate is provided with a sealing portion on the side close to the support plate, and the sealing portion can seal the top of the shell placed in the vacuum cover and the top of the vacuum cover.

[0019] The beneficial effect of this solution is: when the sealing operation is performed on the top of the shell, the No. 1 driving member drives the push plate to slide along the support column toward the support plate, ensuring that the sealing part is tightly fitted with the top of the shell, achieving the sealing of the top of the shell, and effectively preventing gas leakage, which greatly improves the reliability and stability of the sealing on the top of the shell and lays a solid foundation for subsequent air tightness testing.

[0020] Since the push plate is slidably arranged on the support column and the sealing part is arranged on the side close to the support plate, during the process of sealing the top of the shell, the support column can guide the sliding of the push plate, so that the sealing part can accurately and stably seal the top of the shell.

[0021] Furthermore, the lifting part includes a No. 2 driving member and a lifting plate. The No. 2 driving member is installed on the top of the push plate. The driving plate is detachably connected to the output shaft of the No. 2 driving member. A plurality of guide rods are fixedly connected to the side of the driving plate close to the support plate. The guide rods pass through the push plate and are fixedly connected to the top of the lifting plate. The vacuum cover is detachably connected to the side of the lifting plate close to the support plate.

[0022] The beneficial effects of this scheme are as follows: in the process of setting the vacuum hood outside the shell, the output shaft of the No. 2 drive component contracts, driving the lifting plate and the vacuum hood to descend synchronously, and the vacuum hood is set outside the shell. After the vacuum hood descends into place, the top of the vacuum hood fits tightly with the No. 6 sealing ring, effectively achieving a reliable seal on the top of the vacuum hood, effectively ensuring the airtightness of the detection environment, and laying a solid foundation for accurate leak detection.

[0023] The detachable connection between the vacuum cover and the lifting plate greatly improves the applicability and flexibility of the equipment. When faced with different types of shell inspection tasks, operators can quickly and conveniently replace the appropriate vacuum cover without complicated tools and lengthy debugging processes, greatly shortening the equipment preparation time and switching costs, significantly improving production efficiency, and ensuring that under diverse production needs, this technical solution can always accurately and efficiently complete the airtightness inspection of various types of shells, which greatly enhances the competitiveness and practicality of the equipment in the market and provides strong technical support for the production operations of enterprises.

[0024] Furthermore, the lateral blocking unit includes a No. 1 mounting seat and a No. 2 mounting seat. The No. 1 mounting seat is detachably connected to the mounting plate. A No. 3 driving member is installed on the No. 1 mounting seat, and the No. 3 driving member can drive the No. 2 mounting seat to move to the side close to the positioning seat. A No. 4 driving member is installed on the No. 2 mounting seat. A blocking rod is installed on the output shaft of the No. 4 driving member. A blocking sleeve is provided on the blocking rod, a No. 3 sealing ring is provided on the blocking sleeve, and a No. 4 sealing ring is provided between the blocking sleeve and the head of the blocking rod.

[0025] The beneficial effects of this solution are as follows: when sealing the side of the shell and the vacuum hood, first start the No. 3 drive, which drives the No. 2 mounting seat to move toward the side of the vacuum hood, driving the sealing sleeve and the sealing rod to move synchronously, and the No. 3 sealing ring on the sealing sleeve seals the side of the vacuum hood. At the same time, the No. 4 sealing ring is inserted into the side hole of the shell along with the sealing rod. Then start the No. 4 drive, and its output shaft contracts to move the sealing rod away from the shell until the head of the sealing rod enters the No. 4 sealing ring to stretch it open, completing the sealing of the side of the shell. The No. 3 sealing ring and the No. 4 sealing ring cooperate with each other to effectively seal the side of the shell and the vacuum hood, prevent gas leakage from the side, ensure the stability of the negative pressure in the vacuum hood and the high pressure environment in the shell, and thus improve the accuracy of air tightness detection. The special expansion seal design of the No. 4 sealing ring allows the sealing ring to fit tightly against the inner wall of the side hole of the shell under the action of the No. 4 driving part when the head of the sealing rod enters. Even under the impact of high-pressure gas in the shell, it can still be reliably sealed to effectively prevent gas leakage, further enhance the reliability of the side seal of the shell, and effectively ensure the accuracy and stability of the test results.

[0026] Furthermore, a wet detection unit is included, and the wet detection unit is used to detect the leakage position of the shell.

[0027] The beneficial effect of this solution is that during the leakage detection process of the compressor housing, the "dry method" detection of the supporting bearing mechanism can preliminarily determine whether the housing is leaking. If the "dry method" detects that the housing leakage exceeds the standard, the wet method detection unit will be activated to accurately locate the leakage position, making up for the deficiency that the "dry method" cannot clearly identify the specific leakage point. Based on the wet method detection results, the technicians can accurately repair or improve the housing, greatly improve the repair efficiency, and save time and resources for blind inspection.

[0028] Furthermore, it also includes a control unit, which includes a controller and a voice alarm. The differential pressure sensor, the voice alarm, the No. 1 drive, the No. 2 drive, the No. 3 drive, the No. 4 drive, the wet detection unit, the No. 1 one-way valve, the No. 2 one-way valve, and the exhaust valve are all electrically connected to the controller.

[0029] The beneficial effects of this solution are as follows: First, the controller can accurately control the No. 1 drive, the No. 2 drive, the No. 3 drive and the No. 4 drive, so as to achieve rapid and accurate blocking of the shell and the vacuum cover, reduce the time and error of manual operation, thereby improving the overall detection efficiency and making the detection process smoother and more efficient. Secondly, the voice alarm will broadcast whether the product is qualified. In this way, the operator does not have to keep paying attention to other indicating devices, but only needs to listen to the voice prompt to know the test results, which is more convenient in operation, especially when performing multi-task operations or in a noisy working environment. Its convenience advantage is more prominent. Furthermore, the wet detection unit is electrically connected to the controller. When there is a need for wet detection, the controller can easily control the start-up and operation of the wet detection unit, successfully achieving the organic integration of dry detection and wet detection, broadening the detection means, making the detection results more comprehensive and accurate, effectively guaranteeing the quality and reliability of the detection, and providing a more solid foundation for product quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional front view of an existing compressor housing; Figure 2 A bottom-up three-dimensional diagram of an existing compressor housing; Figure 3 A three-dimensional diagram of a leak detection system for an aluminum alloy product in Example 1 of the present invention; Figure 4 It is a three-dimensional diagram of the supporting bearing mechanism, the top blocking unit and the vacuum lifting unit in Example 1 of the present invention; Figure 5 A three-dimensional diagram of the blocking portion in Example 1 of the present invention; Figure 6 A three-dimensional diagram of the supporting bearing mechanism in Example 1 of the present invention; Figure 7 for Figure 6 A partial enlarged view of the middle A; Figure 8 Schematic diagram of the gas path detection unit in Example 1 of the present invention; Fig. 9 A three-dimensional diagram of the lateral blocking unit in Example 1 of the present invention; Fig.10 It is a three-dimensional diagram of the supporting bearing mechanism and the wet detection unit in Example 1 of the present invention. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: housing 1, arc hole 2, connecting hole 3, circular hole 4, blind hole 5, chassis 6, top plate 7, support plate 8, support column 9, No. 1 driving member 10, connecting plate 11, push plate 12, connecting column 13, connecting rod 14, No. 1 connecting plate 15, No. 2 connecting plate 16, blocking plate 17, No. 6 sealing ring 18, vacuum cover 19, No. 2 driving member 20, lifting plate 21, driving plate 22, guide rod 23, guide plate 24, guide column 25, guide sleeve 26, guide hole 27, ventilation plate 28, positioning seat 29, rubber ring 30, No. 1 sealing ring 31, No. 2 sealing ring 32, No. 1 positioning column 33, No. 2 positioning column 34, mounting plate 3 5. L-shaped positioning strip 36, No. 1 air inlet 37, No. 2 air inlet 38, No. 1 exhaust hole 39, No. 2 exhaust hole 40, air source 41, exhaust equipment 42, air inlet pipe 43, pneumatic valve 44, No. 1 pressure gauge 45, No. 1 non-return valve 46, exhaust pipe 47, exhaust valve 48, air inlet channel 49, exhaust pipe 50, No. 2 pressure gauge 51, No. 2 non-return valve 52, exhaust channel 53, differential pressure sensor 54, No. 1 mounting seat 55, No. 2 mounting seat 56, No. 3 driving member 57, No. 4 driving member 58, "I"-shaped push rod 59, blocking rod 60, blocking sleeve 61, No. 3 sealing ring 62, No. 4 sealing ring 63, No. 5 driving member 64, water tank 65, sight glass 66.

[0032] Example 1 like Figure 1 As shown, the existing compressor housing 1 is a cylindrical structure with the bottom and the top connected. Six arc-shaped holes 2 are opened on the upper side of the housing 1 and penetrate to the bottom. Each arc-shaped hole 2 is provided with a partition bar, thereby dividing the arc-shaped hole 2 at the bottom of the housing 1 into two parts, forming a total of arc-shaped holes 2 at the bottom of the housing 1. The partition bar is integrally formed with the housing 1. A connecting hole 3 is opened on the left side of the housing 1, and the connecting hole 3 is connected to one of the arc-shaped holes 2. Figure 2 As shown, the front side of the housing 1 is provided with two symmetrically distributed circular holes 4 and two symmetrically distributed blind holes 5 .

[0033] like Figure 3 The aluminum alloy product leak detection system shown includes a chassis 6, an air path detection unit, a wet detection unit and a supporting bearing mechanism.

[0034] like Figure 3-4 As shown, a support bearing mechanism installation area is provided on the upper left side of the chassis 6, and the support bearing mechanism includes a support unit and a bearing sealing unit.

[0035] like Figure 3-4As shown, the support unit includes a top plate 7 and a support plate 8. The top plate 7 is firmly connected to the top of the inside of the chassis 6 by bolts. Support columns 9 are installed at the four corners of the bottom of the top plate 7 by bolts, and the lower end of each support column 9 is fixed to the support plate 8 by welding, thereby constructing a stable and reliable support structure.

[0036] like Figure 3-4 As shown, a top blocking unit is slidably provided on the support unit, and the top blocking unit includes a No. 1 driving member 10, a connecting plate 11 and a push plate 12. A mounting hole is provided on the top of the chassis 6, and the No. 1 driving member 10 is installed on the top of the top plate 7. Its output shaft passes through the top plate 7 and is fixed to the connecting plate 11 by bolt connection. The four corner positions at the bottom of the connecting plate 11 are all installed with connecting columns 13 by bolts, and the lower ends of each connecting column 13 are welded to the upper side of the push plate 12. The push plate 12 is slidably provided on the support column 9, and a blocking portion is provided at the bottom of the push plate 12.

[0037] like Figure 5 As shown, the blocking part includes a connecting rod 14 and a blocking plate 17, wherein a No. 1 connecting plate 15 is integrally formed at the upper end of the connecting rod 14, and a No. 2 connecting plate 16 is integrally formed at the lower end of the connecting rod 14, wherein the No. 1 connecting plate 15 is connected to the bottom of the push plate 12 by bolts, and the No. 2 connecting plate 16 is connected to the top of the blocking plate 17 by bolts. Further, in order to improve the installation efficiency and installation accuracy of the blocking part, a No. 1 positioning groove is provided at the bottom of the push plate 12, the upper end of the connecting rod 14 extends to the top of the No. 1 connecting plate 15, a No. 2 positioning groove is provided at the top of the blocking plate 17, and the lower end of the connecting rod 14 extends to the bottom of the No. 2 connecting plate 16. With such a design, the installation position of the No. 1 connecting plate 15 at the bottom of the push plate 12 can be accurately and quickly determined by the upper end of the connecting rod 14 cooperating with the No. 1 positioning groove; the installation position of the No. 2 connecting plate 16 at the top of the blocking plate 17 can be accurately and quickly determined by the lower end of the connecting rod 14 cooperating with the No. 2 positioning groove. A No. 5 sealing ring is glued to the bottom of the sealing disk 17, and the No. 5 sealing ring is used to seal the top of the shell 1, and the sealing position is on the shell 1 outside the arc hole 2, so as to construct a closed space inside the shell 1 and the arc hole 2; a No. 6 sealing ring 18 is glued to the top of the sealing disk 17, and the No. 6 sealing ring 18 is used to seal the top of the vacuum cover 19.

[0038] like Figure 4As shown, a vacuum lifting unit is slidably provided on the top blocking unit, and the vacuum lifting unit includes a vacuum cover 19 and a lifting part, and the lifting part can drive the vacuum cover 19 to perform lifting movement, so that the vacuum cover 19 can be covered on the outside of the housing 1. Specifically, the lifting part includes a No. 2 driving member 20 and a lifting plate 21, and the No. 2 driving member 20 is installed on the top of the push plate 12 by bolts, and a driving plate 22 is installed on the output shaft of the No. 2 driving member 20 by bolts, and a guide rod 23 is welded at the four corners of the bottom of the driving plate 22, and the lower end of the guide rod 23 passes through the push plate 12 and is welded to the lifting plate 21 below it, and the guide rod 23 is slidably connected with the push plate 12. The vacuum cover 19 is installed on the bottom of the lifting plate 21 by bolts, and the vacuum cover 19 is driven to descend by the No. 2 driving member 20, and the vacuum cover 19 is covered on the housing 1, and it is ensured that the top of the vacuum cover 19 is tightly fitted with the No. 2 seal, so as to achieve effective sealing of the top of the vacuum cover 19.

[0039] Furthermore, in order to enhance the stability of the lifting part, a guide unit is provided between the lifting plate 21 and the vacuum cover 19, and the vacuum cover 19 is mounted on the guide unit. Figure 4 As shown, the guide unit includes a guide plate 24 and four guide columns 25. The guide plate 24 is connected to the bottom of the lifting plate 21 by bolts. The vacuum cover 19 is installed at the bottom of the guide plate 24 by bolts. The lifting plate 21 and the guide plate 24 are provided with through holes in the middle for the plugging part to pass through. The lower end of the guide column 25 is installed on the bearing sealing unit. Four guide sleeves 26 are installed at the four corners of the bottom of the guide plate 24 by bolts. The guide sleeves 26 are connected to the top of the guide plate 24. Four guide holes 27 are provided on the push plate 12. The guide column 25 is slidably arranged in the guide sleeves 26 and the guide holes 27.

[0040] like Figure 4 , Figure 6 and Figure 7As shown, the bearing sealing unit is arranged on the top of the support plate 8, and the bearing sealing unit includes a vent plate 28, which is installed on the top of the support plate 8 by bolts, and a positioning seat 29 is installed on the top of the support plate 8 by bolts, and a No. 7 sealing ring is arranged between the positioning seat 29 and the vent plate 28, and the bottom of the positioning seat 29 can be sealed by the No. 7 sealing ring, and when the inside of the shell 1 is ventilated, the gas is effectively prevented from leaking from the bottom of the positioning seat 29 into the vacuum cover 19. A rubber ring 30 is glued to the side of the positioning seat 29, and when the shell 1 is placed, the rubber ring 30 can prevent the positioning seat 29 from scratching the inner wall of the shell 1. The upper side of the vent plate 28 is opened with a No. 1 annular groove and a No. 2 annular groove concentric with the positioning seat 29, and a No. 1 sealing ring 31 is glued in the No. 1 annular groove, which is used to seal the bottom of the shell 1, and the sealing position is on the shell 1 outside the arc hole 2. A No. 2 sealing ring 32 is glued in the No. 2 annular groove to seal the bottom of the vacuum cover 19; No. 1 positioning columns 33 are installed on the left and right sides of the upper side of the ventilation plate 28 by bolts, and the No. 1 positioning columns 33 correspond to the circular holes 4 at the bottom of the shell 1. No. 2 positioning columns 34 are installed on the front and rear sides of the upper side of the ventilation plate 28 by bolts, and the No. 2 positioning columns 34 correspond to the blind holes 5 at the bottom of the shell 1.

[0041] Furthermore, in order to facilitate the replacement of the load-bearing sealing unit to adapt to the detection requirements of different types of shells 1, the load-bearing sealing unit also includes a mounting plate 35, and L-shaped positioning strips 36 are installed on the left and right sides of the upper side of the support plate 8 by bolts. The mounting plate 35 is installed on the support plate 8 between the two L-shaped positioning strips 36 by bolts, the ventilation plate 28 is installed on the mounting plate 35 by bolts, and the lower end of the guide column 25 is installed on the mounting plate 35 by bolts. By arranging the L-shaped positioning strip 36 on the support plate 8, the mounting plate 35 can be positioned to improve the installation efficiency.

[0042] like Figure 7-8As shown, a No. 1 air inlet hole 37 is opened on the top of the positioning seat 29, a No. 2 air inlet hole 38 is opened on the right side of the ventilation plate 28, and the No. 1 air inlet hole 37 is connected with the No. 2 air inlet hole 38 to form an air inlet channel 49; a No. 1 exhaust hole 39 is opened on the ventilation plate 28 between the No. 1 sealing ring 31 and the No. 2 sealing ring 32, and a No. 2 exhaust hole 40 is opened on the right side of the ventilation plate 28, and the No. 1 exhaust hole 39 is connected with the No. 2 exhaust hole 40 to form an exhaust channel 53. The air path detection unit includes an air source 41 and an exhaust device 42. The air source 41 is connected to an air intake pipe 43. A pneumatic valve 44, a No. 1 pressure gauge 45 and a No. 1 non-return valve 46 are installed on the air intake pipe 43 from left to right. The right end of the air intake pipe 43 is connected to the No. 2 air intake hole 38. An exhaust pipe 47 is connected to the air intake pipe 43 between the pneumatic valve 44 and the No. 1 pressure gauge 45. An exhaust valve 48 is installed on the exhaust pipe 47. The exhaust device 42 is connected to an exhaust pipe 50. A No. 2 pressure gauge 51 and a No. 2 non-return valve 52 are installed on the exhaust pipe 50 from left to right. The right end of the exhaust pipe 50 is connected to the No. 2 air exhaust hole 40. A differential pressure sensor 54 is connected in parallel between the air intake pipe 43 and the exhaust pipe 50. The differential pressure sensor 54 is located between the No. 1 non-return valve 46 and the shell 1. The pressure of the high-pressure gas injected into the shell 1 is 1-2MPa. In this embodiment, the pressure of the high-pressure gas injected into the housing 1 is 2 MPa, the air extraction device 42 is a vacuum pump, and the gas source 41 is compressed air.

[0043] like Figure 6 As shown, the bearing sealing unit is also provided with a lateral blocking unit, which is located on the mounting plate 35 at the rear side of the positioning seat 29 and is used to seal the side of the housing 1 and the side of the vacuum cover 19. Specifically, as Fig. 9As shown, the lateral blocking unit includes a No. 1 mounting seat 55, a No. 2 mounting seat 56, a No. 3 driving member 57 and a No. 4 driving member 58. The No. 1 mounting seat 55 is mounted on the plate 35 by bolts, and the No. 3 driving member 57 is installed on the left side of the No. 1 mounting seat 55 by bolts. The output shaft of the No. 3 driving member 57 passes through the left side surface of the No. 1 mounting seat 55, and an "I"-shaped push rod 59 is installed on its output shaft by bolts. The "I"-shaped push rod 59 is clamped on the left side surface of the No. 2 mounting block, and the No. 2 mounting seat 56 is slidably arranged on the No. 1 mounting seat 55, and the No. 2 mounting seat 56 is driven to move by the No. 3 driving member 57. The fourth drive member 58 is installed inside the second mounting seat 56 by bolts, the output shaft of the fourth drive member 58 passes through the right side of the second mounting seat 56, and a blocking rod 60 is installed on its output shaft by bolts, a blocking sleeve 61 is sleeved on the blocking rod 60, the left end of the blocking sleeve 61 is connected to the right side of the second mounting seat 56 by bolts, and a third sealing ring 62 is glued on the blocking sleeve 61, and the third sealing ring 62 is used to seal the side of the vacuum cover 19. A fourth sealing ring 63 is sleeved on the blocking rod 60 between the blocking sleeve 61 and the head of the blocking rod 60, and the output shaft of the fourth drive member 58 shrinks, which can drive the blocking rod 60 to move to the side away from the housing 1, so that the head of the blocking rod 60 moves to the inside of the fourth sealing ring 63, and the fourth sealing ring 63 is opened, so as to achieve the connection hole 3 on the housing 1 to be blocked.

[0044] like Fig. 9 As shown, the wet detection unit is arranged in the chassis 6 below the supporting bearing mechanism, and the wet detection unit includes a No. 5 driving member 64 and a water tank 65. The water tank 65 is a box structure with an open top, and the water tank 65 is vertically slidably arranged in the chassis 6. The No. 5 driving member 64 can drive the water tank 65 to rise and fall, and a sight glass 66 is installed on the front side of the water tank 65, through which the leakage position of the housing 1 can be observed. In this embodiment, the No. 1 driving member 10, the No. 2 driving member 20, the No. 3 driving member 57, the No. 4 driving member 58 and the No. 5 driving member 64 are all cylinders.

[0045] The specific implementation process is as follows: The detection of the airtightness of the housing 1 includes the following steps: (1) Placing the housing 1: placing the housing 1 on the ventilation plate 28, and using the positioning seat 29, the first positioning column 33 and the second positioning column 34 to accurately position the housing 1; (2) Seal the upper and lower ends of the shell 1: After the shell 1 is placed in place, start the No. 1 driving member 10, which drives the push plate 12 to slide downward along the support column 9, thereby driving the sealing disk 17 to move synchronously, and press the sealing disk 17 tightly against the top of the shell 1. The top of the shell 1 is sealed by the No. 5 sealing ring, and the bottom of the shell 1 is sealed by the No. 1 sealing ring 31, thereby achieving effective sealing at the upper and lower ends of the shell 1.

[0046] (3) Covering the vacuum cover 19 and sealing the upper and lower ends of the vacuum cover 19: Start the No. 2 driving member 20, the output shaft of the No. 2 driving member 20 contracts, driving the guide plate 24 to move downward along the guide column 25, and then driving the vacuum cover 19 to move synchronously, and the vacuum cover 19 is covered outside the shell 1. At this time, the top of the inner part of the vacuum cover 19 is tightly fitted with the top of the blocking disk 17, the top of the vacuum cover 19 is sealed by the No. 6 sealing ring 18, and the bottom of the vacuum cover 19 is sealed by the No. 2 sealing ring 32, ensuring the sealing of the upper and lower ends of the vacuum cover 19; (4) Blocking the side of the shell 1 and the vacuum cover 19: Start the No. 3 driving member 57, which drives the No. 2 mounting seat 56 to move toward the side close to the vacuum cover 19, thereby driving the sealing sleeve 61 and the sealing rod 60 to move synchronously, and the side of the vacuum cover 19 is sealed by the No. 3 sealing ring 62 on the sealing sleeve 61. At this time, the No. 4 sealing ring 63 and the sealing rod 60 are inserted into the connecting hole 3, and the No. 4 driving member 58 is started. The output shaft of the No. 4 driving member 58 contracts, driving the sealing rod 60 to move toward the side away from the shell 1, so that the head of the sealing rod 60 moves into the No. 4 sealing ring 63, and the No. 4 sealing ring 63 is stretched open to block the connecting hole 3 on the shell 1, thereby constructing an independent enclosed space inside the shell 1, and also forming a closed area between the shell 1 and the vacuum cover 19.

[0047] (5) Filling the shell 1 with high-pressure gas and extracting the gas in the vacuum cover 19: The process of filling the shell 1 with high-pressure gas is as follows: opening the No. 1 one-way valve 46, and filling the shell 1 with high-pressure gas through the gas source 41, so that the gas pressure inside the shell 1 reaches 2MPa. After the filling is completed, the No. 1 one-way valve 46 is closed; the process of extracting the gas in the vacuum cover 19 is as follows: opening the No. 2 one-way valve 52, and using the exhaust device 42 to extract the gas in the vacuum cover 19, creating a negative pressure state in the vacuum cover 19. After the exhaust is completed, the No. 2 one-way valve 52 is closed, and the pressure change between the vacuum cover 19 and the shell 1 is monitored in real time through the differential pressure sensor 54, and it is judged whether the leakage of the shell 1 exceeds the specified standard based on the monitoring data, so as to accurately determine whether the leakage of the shell 1 is qualified.

[0048] The above is a process of installing the housing 1 on the sealing detection mechanism and performing the detection, while the process of removing the housing 1 from the sealing detection mechanism is opposite to it, which will not be repeated here.

[0049] If the leakage of the housing 1 exceeds the specified standard, the wet detection unit is used to detect the leakage position of the housing 1. The specific detection process is as follows: (1) Removing the lateral blocking unit on the shell 1 and the vacuum cover 19: Start the No. 4 driving member 58, the output shaft of the No. 4 driving member 58 extends, driving the blocking rod 60 to move toward the side close to the shell 1, so that the head of the blocking rod 60 extends out of the No. 4 sealing ring 63; then start the No. 3 driving member 57, the No. 3 driving member 57 drives the No. 2 mounting seat 56 to move toward the side away from the vacuum cover 19, thereby removing the lateral blocking unit on the shell 1 and the vacuum cover 19; (2) Removing the vacuum cover 19: Start the second driving member 20, the output shaft of the second driving member 20 extends, driving the guide plate 24 to move upward along the guide column 25, and then driving the vacuum cover 19 to move synchronously, so that the vacuum cover 19 is away from the housing 1; (3) Using the lateral blocking unit to block the connection hole 3 on the side of the shell 1: Start the No. 3 driving member 57, the No. 3 driving member 57 drives the No. 2 mounting seat 56 to move toward the side close to the shell 1, thereby driving the blocking sleeve 61 and the blocking rod 60 to move synchronously, and the No. 4 sealing ring 63 and the blocking rod 60 are inserted into the connection hole 3, and start the No. 4 driving member 58, the output shaft of the No. 4 driving member 58 contracts, driving the blocking rod 60 to move toward the side away from the shell 1, so that the head of the blocking rod 60 moves into the No. 4 sealing ring 63, the No. 4 sealing ring 63 is opened, and the connection hole 3 on the shell 1 is blocked, thereby constructing an independent closed space inside the shell 1; (4) Detecting the leakage position of the shell 1: Start the No. 5 driving member 64, the output shaft of the No. 5 driving member 64 extends, driving the water tank 65 to rise synchronously, immersing the shell 1 in the water in the water tank 65, and observing the leakage position of the shell 1 through the sight glass 66.

[0050] Example 2 On the basis of Example 1, a control unit is further included, the control unit includes a controller, a voice alarm is installed on the top of the chassis 6, and the differential pressure sensor 54, the voice alarm, the first drive 10, the second drive 20, the third drive 57, the fourth drive 58, the fifth drive 64, the first check valve 46, the second check valve 52, and the exhaust valve 48 are all electrically connected to the controller. In this embodiment, the controller uses a single chip microcomputer of model STC89C51, and the model of the differential pressure sensor is SM5652.

[0051] After placing the shell 1 on the ventilation plate 28, the controller accurately drives the No. 1 driving member 10 to operate, and the No. 1 driving member 10 pushes the sealing disk 17 to tightly seal the top of the shell 1. At the same time, the No. 1 sealing ring 31 pre-arranged on the ventilation plate 28 also synchronously completes the sealing operation on the bottom of the shell 1, thereby ensuring that the upper and lower ends of the shell 1 are in an effectively sealed state.

[0052] After the upper and lower ends of the shell 1 are sealed, the controller immediately issues a command to start the No. 2 driving member 20, which drives the vacuum cover 19 to descend and accurately cover the shell 1. The No. 6 sealing ring 18 fits tightly with the top of the vacuum cover 19 to achieve sealing. The No. 2 sealing ring 32 also effectively seals the bottom of the vacuum cover 19 to ensure the overall sealing of the vacuum cover 19.

[0053] After the upper and lower ends of the vacuum cover 19 are sealed, the controller continues to control the third driving member 57 and the fourth driving member 58 to operate to seal the side surfaces of the housing 1 and the vacuum cover 19 .

[0054] When entering the leakage detection stage of the shell 1, the controller controls the first check valve 46 and the second check valve 52 to open, and closes the exhaust valve 48 at the same time, and the gas source 41 then fills the shell 1 with high-pressure gas, and the exhaust device 42 simultaneously extracts the gas in the vacuum cover 19. After the inflation and exhaust process is completed, the differential pressure sensor 54 detects the pressure change between the shell 1 and the vacuum cover 19, and feeds back the pressure data to the controller in real time.

[0055] The controller automatically calculates the leakage of the shell 1 with the help of the built-in algorithm program, and controls the voice alarm to broadcast according to the calculation result. If the leakage of the shell 1 exceeds the preset standard, the controller immediately instructs the voice alarm to issue a warning that the product is unqualified. At the same time, the fifth drive member 64 is driven to operate, and the output shaft of the fifth drive member 64 is extended, driving the water tank 65 to rise steadily, so that the shell 1 is completely immersed in water, so that the leakage point of the shell 1 can be clearly observed and marked in time, providing a clear basis for subsequent repair work.

[0056] When the leakage of the shell 1 does not exceed the standard, the controller controls the voice alarm to announce that the product is qualified, and orderly directs the No. 1 drive 10, No. 2 drive 20, No. 3 drive 57 and No. 4 drive 58 to act according to the established procedures, and safely removes the qualified shell 1 from the vent plate 28. Through such a rigorous and orderly automated control process, especially the use of the voice alarm to clearly announce whether the product is qualified, it effectively eliminates the possibility of missed inspections caused by human factors during the inspection process, greatly improves the accuracy and reliability of the inspection results, provides a strong guarantee for product quality, ensures that every product that passes the inspection can meet the airtightness requirements, and improves the quality control level of the entire production process.

[0057] Example 3 On the basis of Example 2, a buzzer is further included, and a pressure sensor is arranged in the fourth driving member 58. The pressure sensor and the buzzer are both electrically connected to the controller. In this embodiment, the model of the pressure sensor is MPXV7002.

[0058] When the lateral blocking unit is used to block the connection hole 3 on the side of the vacuum cover 19 and the shell 1, the third drive 57 and the fourth drive 58 are started at the same time. The third drive 57 drives the second mounting seat 56 to move to the side close to the vacuum cover 19, thereby driving the blocking sleeve 61 and the blocking rod 60 to move synchronously. At the same time, the output shaft of the fourth drive 58 is extended, driving the blocking rod 60 to move to the side close to the shell 1. When the actual position of the connection hole 3 deviates from the theoretical position, the head of the blocking rod 60 will touch the side wall of the connection hole 3. At this time, the pressure sensor located in the fourth drive 58 will immediately detect the pressure change and quickly feed back the pressure information to the controller. After receiving the pressure change information, the controller will immediately control the buzzer to send an alarm signal to clearly remind the operator that the position of the connection hole 3 has deviated, and then determine that the shell 1 is unqualified. When there is no deviation between the actual position of the connecting hole 3 and the theoretical position, the No. 3 sealing ring 62 on the sealing sleeve 61 will seal the side of the vacuum cover 19, and the No. 4 sealing ring 63 and the sealing rod 60 will be inserted into the connecting hole 3. Through the contraction of the output shaft of the No. 4 driving member 58, the sealing rod 60 is driven to move to the side away from the shell 1, so that the head of the sealing rod 60 moves into the No. 4 sealing ring 63, expands the No. 4 sealing ring 63, and seals the connecting hole 3 on the shell 1.

[0059] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A leak detection system for aluminum alloy products, characterized by: It includes a supporting and bearing mechanism, on which a top sealing unit is slidably arranged, on which a vacuum lifting unit is slidably arranged, the vacuum lifting unit includes a vacuum cover and a lifting part, the lifting part can drive the vacuum cover to rise and fall, and the top sealing unit is used to seal the top of the shell and the top of the vacuum cover; the supporting and bearing mechanism also includes a lateral sealing unit and an air path detection unit, the lateral sealing unit is used to seal the side of the shell and the side of the vacuum cover, and the air path detection unit is used to fill the shell with high-pressure gas, and can extract the gas in the vacuum cover to detect the pressure change between the shell and the vacuum cover.

2. The aluminum alloy product leak detection system according to claim 1, characterized in that: An air intake channel and an air exhaust channel are provided on the supporting bearing mechanism, and the air path detection unit includes an air source and an air exhaust device, the air source is connected with an air intake pipe, on which a pneumatic valve, a No. 1 pressure gauge and a No. 1 non-return valve are sequentially installed, the free end of the air intake pipe is connected with the air intake channel, the air intake pipe between the pneumatic valve and the No. 1 pressure gauge is connected with an exhaust pipe, on which an exhaust valve is installed; the air exhaust device is connected with an air exhaust pipe, on which a No. 2 pressure gauge and a No. 2 non-return valve are sequentially installed, the free end of the air exhaust pipe is connected with the air exhaust channel, a differential pressure sensor is connected in parallel between the air intake pipe and the air exhaust pipe, and the differential pressure sensor is located between the No. 1 non-return valve and the shell.

3. The aluminum alloy product leak detection system according to claim 2, characterized in that: The pressure of the high-pressure gas injected into the shell is 1-2MPa.

4. The aluminum alloy product leak detection system according to claim 3, characterized in that: The supporting and bearing mechanism comprises a supporting unit and a bearing and sealing unit. The supporting unit comprises a top plate, a supporting plate and a plurality of supporting columns. The top plate and the supporting plate are connected through the supporting columns. The bearing and sealing unit is arranged on the supporting plate.

5. The aluminum alloy product leak detection system according to claim 4, characterized in that: The load-bearing sealing unit includes a mounting plate, which is detachably connected to a supporting plate, a ventilation plate detachably connected to the top of the mounting plate, a positioning seat is sealingly connected to the ventilation plate, a No. 1 sealing ring and a No. 2 sealing ring are arranged concentrically with the positioning seat.

6. The aluminum alloy product leak detection system according to claim 5, characterized in that: The top sealing unit includes a No. 1 driving member, a connecting plate, a push plate and a plurality of connecting columns. The No. 1 driving member is installed on the top of the top plate, and its output shaft passes through the top plate and is detachably connected to the connecting plate. The connecting plate and the push plate are fixedly connected through the connecting columns. The push plate is slidably arranged on the supporting columns. The push plate is provided with a sealing portion on the side close to the supporting plate, and the sealing portion can seal the top of the shell placed in the vacuum cover and the top of the vacuum cover.

7. The aluminum alloy product leak detection system according to claim 6, characterized in that: The lifting part includes a No. 2 driving member and a lifting plate. The No. 2 driving member is installed on the top of the push plate. The driving plate is detachably connected to the output shaft of the No. 2 driving member. A plurality of guide rods are fixedly connected to the side of the driving plate close to the support plate. The guide rods pass through the push plate and are fixedly connected to the top of the lifting plate. The vacuum cover is detachably connected to the side of the lifting plate close to the support plate.

8. The aluminum alloy product leak detection system according to claim 7, characterized in that: The lateral blocking unit includes a No. 1 mounting seat and a No. 2 mounting seat. The No. 1 mounting seat is detachably connected to the mounting plate. A No. 3 driving member is installed on the No. 1 mounting seat, and the No. 3 driving member can drive the No. 2 mounting seat to move to the side close to the positioning seat. A No. 4 driving member is installed on the No. 2 mounting seat. A blocking rod is installed on the output shaft of the No. 4 driving member. A blocking sleeve is provided on the blocking rod, a No. 3 sealing ring is provided on the blocking sleeve, and a No. 4 sealing ring is provided between the blocking sleeve and the head of the blocking rod.

9. The aluminum alloy product leak detection system according to claim 8, characterized in that: The invention also comprises a wet method detection unit, which is used for detecting the leakage position of the shell.

10. The aluminum alloy product leak detection system according to claim 9, characterized in that: It also includes a control unit, which includes a controller and a voice alarm. The differential pressure sensor, the voice alarm, the No. 1 drive, the No. 2 drive, the No. 3 drive, the No. 4 drive, the wet detection unit, the No. 1 one-way valve, the No. 2 one-way valve, and the exhaust valve are all electrically connected to the controller.

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