Air tightness testing device for plastic barrel

Abstract

The present application discloses an air tightness test device for a plastic barrel, which belongs to the field of air tightness test technology. It mainly includes a frame, which has a detection table; a top plate, which has an outlet, and a valve is arranged at the outlet; a cover shell, which has an annular cover, a plug is installed on the cover shell, a pressure detector is installed in the plug, and an air nozzle is installed on the cover shell; a worm gear, a fan blade is installed on the worm gear, a mounting cover is installed on the annular cover, a worm is installed on the mounting cover, and a second gear is installed at one end of the worm; an angle piece, a first spring is installed on the angle piece, and one end of two groups of first springs are connected to a sealing cover; a first mounting rod, and a first rack is installed on the first mounting rod. The air tightness test device for a plastic barrel of the present application is provided with a second cylinder, a pressure plate, a cover shell, a worm gear, a mounting cover, a worm, a fan blade, a plug, a sealing cover, a mounting rod and a magnet, so as to perform a pre-evacuation operation before the air tightness test of the plastic barrel, thereby improving the accuracy of the test result.

Description

Technical Field

[0001] The present application relates to the technical field of airtightness testing, and in particular to an airtightness testing device for a plastic barrel. Background Art

[0002] Plastic barrels are barrel-shaped containers made of plastic materials. Plastic barrels are usually made of plastic raw materials such as polyethylene and polypropylene through injection molding, blow molding and other processes. It has the characteristics of being light, corrosion-resistant, not easy to break, and low cost. It can be used to hold various liquids or solid items such as water, chemical raw materials, food, and oil products; during the blow molding process of plastic barrels, air holes are prone to occur, so it is necessary to conduct air tightness testing on plastic barrels to screen out plastic barrels with air hole defects to prevent them from entering the market.

[0003] The patent with authorization announcement number CN218885343U discloses a plastic barrel airtightness detection device, which is equipped with a downward pressure cylinder, a sealing pressure head, a pressure detector and a positioning plate. The downward pressure cylinder drives the sealing pressure head to descend and press the opening of the plastic barrel. The external air supply source is ventilated into the inner cavity of the plastic barrel through the sealing pressure head, and then the pressure change in the inner cavity of the plastic barrel is detected by the pressure detector. The airtightness of the plastic barrel product is judged to be qualified according to the numerical change.

[0004] Although the above device realizes the airtightness detection of the plastic barrel, there is air in the plastic barrel, and the air in the plastic barrel may contain impurities, moisture or gases at different temperatures. However, when the plastic barrel is inflated for airtightness detection, dry air or inert gas is generally filled in, and since the humidity of the filled gas is inconsistent with the air in the plastic barrel, it will affect the accuracy of the detection result and make it difficult to determine the leakage point of the plastic barrel. Therefore, it is necessary to provide an airtightness testing device for a plastic barrel to solve the above problems.

[0005] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0006] Based on the above problems existing in the prior art, the problem to be solved by the present application is: to provide an air tightness testing device for a plastic barrel, so as to perform pre-air extraction before air tightness testing of the plastic barrel and improve the accuracy of the test results.

[0007] The technical solution adopted by the present application to solve its technical problems is: an air tightness testing device for a plastic barrel, comprising a frame, the frame having a detection platform; a lifting mechanism, the lifting mechanism is installed on the detection platform, the lifting mechanism has a second cylinder, and a pressure plate for pressing the plastic barrel; a top plate, the top plate is installed on the pressure plate, the top plate has an outlet, and a valve is provided at the outlet; a cover shell, the cover shell is installed at one end of the top plate, the cover shell has an annular cover, a plug is installed on the cover shell, a pressure detector is installed in the plug, and an air nozzle is installed on the cover shell; a worm wheel, the worm wheel bearing is installed in the annular cover, the worm wheel is installed with a fan blade, the annular cover is installed with a mounting cover, and the mounting cover has a The bearing is installed with a worm meshing with the worm wheel, and a second gear is installed at one end of the worm; an angle piece, which is installed on both sides of the cover shell, and a first spring is installed on the angle piece, one end of two groups of the first springs are connected to a sealing cover, and a limit ring is installed on the inner wall of the sealing cover; a first mounting rod, which is inserted into the pressure plate, and a first rack is installed on the first mounting rod; wherein: the sealing cover is suitable for moving downward with the telescopic end of the second cylinder to be suitable for covering the plastic barrel, and the cover shell is suitable for driving the second gear to move downward to be suitable for approaching the first rack, and under the action of the first rack, the second gear is driven to rotate, so as to drive the fan blade to rotate, so as to extract the air in the plastic barrel.

[0008] Furthermore, the pressing plate is provided with a first movable groove adapted to the width of the first mounting rod, and a first magnet is installed at one end of the inner wall of the first movable groove;

[0009] A mounting seat is installed on the pressure plate, a second spring is installed on the mounting seat, a first track is installed on a side of the first mounting rod close to the second spring, one end of the second spring is connected to a first slide seat, and the first slide seat is slidably installed on the first track.

[0010] Furthermore, a center rod is provided through the center of the second spring, one end of the center rod is connected to the first sliding seat, and the other end of the center rod movably passes through the mounting seat.

[0011] Furthermore, two groups of movable grooves are provided on one side of the first mounting rod close to the mounting cover, and sliding rods are connected and slidable in the two groups of movable grooves. A third spring is installed in the movable groove, and one end of the third spring is connected to the sliding rod.

[0012] Furthermore, a second track is installed on a side of the slide bar close to the detection platform, a second slide seat is slidably installed on the second track, a shaft rod is installed on the second slide seat, one end of the shaft rod is fixedly connected to the mounting cover, the first rack is located at the lower end of the moving groove, and the first rack has a smooth section;

[0013] A first T block is installed at one end of the first installation rod, and a sliding groove matching the size of the first T block is provided on the sealing cover.

[0014] Furthermore, one end of the first mounting rod is connected to a connecting rod, one end of the connecting rod is installed with a second mounting rod, the second mounting rod is movably inserted into the pressure plate, a second movable groove adapted to the width of the second mounting rod is opened on the pressure plate, a second magnet is installed in the second movable groove, a side of the second mounting rod close to the second magnet is set to a magnetic material, and a side of the first mounting rod close to the first magnet is set to a magnetic material.

[0015] Furthermore, a second T-block is installed at one end of the second mounting rod, a limiting groove adapted for use with the second T-block is provided on the sealing cover, the second T-block slides in the limiting groove, a second rack is installed on the second mounting rod, and a third gear is fixedly installed at the other end of the worm;

[0016] Two groups of push blocks are installed at the lower end of the slide rod, two groups of first pin blocks are installed on the first mounting rod, the first pin blocks are located at the lower end position of the movable groove, a right-angle block is installed on the side of the mounting cover, and a second pin block is installed on the second mounting rod.

[0017] Furthermore, both the first rack and the second rack have teeth, and the number of teeth on the first rack is less than the number of teeth on the second rack.

[0018] Furthermore, a controller is installed on the rack, two groups of slide rails are installed on the rack, and a placement table is slidably installed on the two groups of slide rails.

[0019] Furthermore, two sets of limiting mechanisms are installed on the detection platform, and the limiting mechanisms include a mounting frame installed on the detection platform, a first cylinder is installed on the mounting frame, and a clamping plate is installed at the telescopic end of the first cylinder.

[0020] The beneficial effect of the present application is that the present application provides a plastic barrel air tightness testing device, which can realize pre-evacuation of air before air tightness testing of the plastic barrel through the arrangement of a second cylinder, a pressure plate, a top plate, a cover shell, a first spring, a worm gear, a mounting cover, a worm, a fan blade, a plug, a sealing cover, a mounting rod and a magnet, so as to avoid the initial air pressure, humidity, temperature and other factors in the plastic barrel being different due to environmental changes, thereby affecting the accuracy of the test results.

[0021] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 This is an overall schematic diagram of an air tightness testing device for a plastic barrel in this application;

[0024] Figure 2 for Figure 1 The structure diagram of the limiting mechanism and lifting mechanism in the figure;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the middle A area;

[0026] Figure 4 for Figure 2 The local structure diagram of

[0027] Figure 5 for Figure 4 A magnified schematic diagram of the middle B area;

[0028] Figure 6 for Figure 5 Enlarged schematic diagram of the middle C area;

[0029] Figure 7 for Figure 5 A magnified schematic diagram of the middle D area;

[0030] Figure 8 for Figure 1 Schematic diagram of the working state of the middle sealing cover;

[0031] Fig. 9 for Figure 1 Schematic diagram of the working state of the middle annular cover;

[0032] Fig.10 for Fig. 9 Schematic diagram of the working state of the third gear;

[0033] Fig.11 for Fig.10 A magnified schematic diagram of the middle E region;

[0034] Fig.12 for Fig.10 Partial structural diagram of the detection mechanism;

[0035] Among them, the reference numerals in the figure are:

[0036] 1. Rack; 101. Controller; 102. Testing table; 103. Slide rail; 104. Placement table;

[0037] 2. Limiting mechanism; 201. Mounting frame; 202. First cylinder; 203. Clamping plate;

[0038] 3. Lifting mechanism; 301. Pillar; 302. Support plate; 303. Second cylinder; 304. Press plate;

[0039] 4. Detection mechanism; 401. Top plate; 402. Air nozzle; 403. Cover; 404. Angle piece; 405. First spring; 406. Worm gear; 407. Mounting cover; 408. Worm; 409. Fan blade; 410. Sealing ring; 411. Plug; 412. Sealing cover; 413. Slide; 414. First mounting rod; 415. First T block; 416. Connecting rod; 417. First magnet; 418. First track; 419. First slide seat; 420. Second Spring; 421, mounting seat; 422, movable groove; 423, third spring; 424, sliding rod; 425, second track; 426, second sliding seat; 427, push block; 428, shaft rod; 429, second gear; 430, first pin block; 431, first rack; 432, smooth section; 433, annular cover; 434, second mounting rod; 435, second pin block; 436, second rack; 437, right-angle block; 438, third gear; 439, second magnet. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0042] Embodiment 1: Figure 1-Figure 2As shown, the present application provides an air tightness test device for a plastic barrel, comprising a frame 1, the frame 1 having a detection table 102, a controller 101 installed on the frame 1, the controller 101 is used to control the operation of each driving component, two sets of slide rails 103 are installed on the frame 1, and a placement table 104 is slidably installed on the two sets of slide rails 103, and the placement table 104 is used to place the plastic barrel;

[0043] The placement platform 104 is adapted to move along the linear direction of the slide rail 103 so as to move the plastic barrel to a designated position;

[0044] like Figure 2 As shown, two sets of limiting mechanisms 2 are installed on the testing platform 102, and the limiting mechanisms 2 are used to limit and clamp the plastic barrel on the placement platform 104 to maintain the stability of the plastic barrel during airtightness testing, and the limiting mechanisms 2 include a mounting frame 201 fixedly installed on the testing platform 102, a first cylinder 202 is fixedly installed on the mounting frame 201, and a clamping plate 203 is fixedly installed at the telescopic end of the first cylinder 202, and the clamping plate 203 is suitable for moving with the telescopic end of the first cylinder 202 to clamp the plastic barrel;

[0045] A lifting mechanism 3 is installed on the testing platform 102, and the lifting mechanism 3 includes four groups of pillars 301 fixedly installed on the testing platform 102, a support plate 302 is connected to one end of the four groups of pillars 301, a second cylinder 303 is installed on the support plate 302, and a pressing plate 304 is fixedly installed at the telescopic end of the second cylinder 303;

[0046] The pressing plate 304 is adapted to move linearly along with the telescopic end of the second cylinder 303 so as to be adapted to approach or move away from the opening of the plastic barrel;

[0047] like Figure 3-Figure 5 As shown, a detection mechanism 4 is installed on the pressing plate 304, and the detection mechanism 4 is used to perform airtight detection on the plastic barrel, and the detection mechanism 4 includes a top plate 401 installed through the pressing plate 304, the top plate 401 has an outlet, and a one-way valve is arranged at the outlet, and a cover 403 is installed at one end of the top plate 401, and a plug 411 is fixedly installed at one end of the cover 403, and the plug 411 is a hollow annular structure, and the plug 411 is suitable for synchronously moving with the movement of the pressing plate 304, so as to be suitable for sealing the opening of the plastic barrel;

[0048] An air nozzle 402 is installed on the cover shell 403, and the air nozzle 402 is suitable for connecting to an external air supply source to supply air into the plastic barrel. A pressure detector (not shown in the figure) is fixedly installed in the plug 411, and the pressure detector is used to detect the pressure change in the inner cavity of the plastic barrel.

[0049] To sum up: when it is necessary to test the air tightness of a plastic barrel, the plastic barrel is placed on the placement table 104 and pushed to be directly below the plug 411. The controller 101 controls the first cylinder 202 to drive the clamp 203 to clamp the plastic barrel on the placement table 104. The controller 101 controls the second cylinder 303 to start. The second cylinder 303 drives the plug 411 to descend and press the opening of the plastic barrel. The valve is then controlled by the controller 101 to close the outlet of the top plate 401, so that the external air supply source can ventilate the inner cavity of the plastic barrel through the air nozzle 402 until the specified amount of gas is supplied and the air supply is stopped. After the plug 411 remains in a compressed state for a certain period of time, the pressure change in the inner cavity of the plastic barrel is detected by the pressure detector. The air tightness of the plastic barrel product is determined to be qualified based on the change in the numerical value. The unqualified plastic barrels are then taken away by the workers.

[0050] Embodiment 2: Since there is air in the plastic barrel, the air in the plastic barrel may contain impurities, moisture or gases at different temperatures. However, when the plastic barrel is inflated for air tightness testing, dry air or inert gas is generally filled in. Since the humidity of the filled gas is inconsistent with the air humidity in the plastic barrel, the accuracy of the test result will be affected, and it will be difficult to determine the leakage point of the plastic barrel.

[0051] In order to solve the above problems, Figure 3-Figure 7 As shown, the middle position of the housing 403 is provided with an annular cover 433, and an air extraction unit is installed in the annular cover 433, and the air extraction unit includes a worm wheel 406 with a bearing installed in the annular cover 433, and a fan blade 409 is fixedly installed at the center position of the worm wheel 406, and a mounting cover 407 is connected and installed on the annular cover 433, and a worm 408 is installed on the mounting cover 407 with a bearing, and the worm 408 is meshed with the worm wheel 406;

[0052] The worm 408 is adapted to rotate to drive the worm wheel 406 to rotate, and is adapted to drive the fan blade 409 to rotate, so that the air in the plastic barrel is sucked and discharged through the outlet of the top plate 401. It should be noted that when the one-way valve at the outlet of the top plate 401 is opened, only the gas is allowed to be discharged from the inside of the plastic barrel to the outside, so as to prevent the external gas from entering the inside of the plastic barrel;

[0053] like Figure 5 As shown, angle pieces 404 are fixedly installed on both sides of the cover 403, first springs 405 are fixedly installed on the angle pieces 404, and sealing covers 412 are connected to one end of the two groups of first springs 405, one end of the cover 403 extends into the sealing cover 412, and a through hole (not marked in the figure) matching the diameter of the cover 403 is opened on the sealing cover 412, and the plug 411 is in the sealing cover 412;

[0054] A limit ring (such as Figure 5 ), the limiting ring is suitable for limiting the position of the sealing cover 412 sleeved on the plastic barrel, the top plate 401 is suitable for synchronously moving downward with the descending of the pressing plate 304, so as to drive the sealing cover 412 to cover the plastic barrel, so as to seal the open end of the plastic barrel, and as the telescopic end of the second cylinder 303 continues to move, the sealing cover 412 is acted upon by the limiting ring, so that the position of the sealing cover 412 sleeved on the plastic barrel is fixed, and at this time, the plug 411 has a first gap from the opening of the plastic barrel;

[0055] As the pressing plate 304 continues to drive the top plate 401, the top plate 401 drives the cover 403 to move downward and squeeze the first spring 405. At the same time, the cover 403 gradually extends into the sealing cover 412 and drives the plug 411 to gradually approach the opening of the plastic barrel.

[0056] A sealing ring 410 is sleeved on the lower end of the annular cover 433 on the cover shell 403. When the cover shell 403 drives the annular cover 433 to continue to move downward, the sealing ring 410 can be engaged in the gap between the sealing cover 412 and the cover shell 403 to increase the sealing performance of the connection between the cover shell 403 and the sealing cover 412.

[0057] like Figure 5-Figure 7 As shown, a first mounting rod 414 is movably inserted into the pressing plate 304, and a first movable groove (not shown in the figure) adapted to the width of the first mounting rod 414 is provided on the pressing plate 304, so that the first mounting rod 414 can slide horizontally in the first movable groove;

[0058] A mounting seat 421 is fixedly mounted on the pressing plate 304, a second spring 420 is fixedly mounted on the mounting seat 421, and a first track 418 is fixedly mounted on a surface of the first mounting rod 414 close to the second spring 420, and a first slide seat 419 is connected to one end of the second spring 420, and the first slide seat 419 is slidably mounted on the first track 418, so that when the pressing plate 304 moves vertically, the first slide seat 419 can move synchronously along the first track 418;

[0059] A center rod (not shown) is provided through the center of the second spring 420, one end of the center rod is connected to the first slide seat 419, and the other end of the center rod movably passes through the mounting seat 421, and the center rod is suitable for allowing the second spring 420 to be stretched only in a straight line;

[0060] A first magnet 417 is fixedly mounted on one end of the inner wall of the first movable groove. In the initial state, the first mounting rod 414 is pressed against one end of the inner wall of the first movable groove away from the first magnet 417 under the action of the second spring 420.

[0061] Two groups of moving grooves 422 are provided in the middle of the first mounting rod 414 near the mounting cover 407. Slide rods 424 are slidably connected in the two groups of moving grooves 422, so that the slide rods 424 can slide in the vertical direction along the moving grooves 422. A third spring 423 is fixedly installed in the moving grooves 422. One end of the third spring 423 is connected to the slide rod 424, and the third spring 423 is suitable for supporting the slide rod 424.

[0062] A second track 425 in the horizontal direction is provided at the bottom of the slide bar 424, and a second slide seat 426 is slidably mounted on the second track 425, so that the second slide seat 426 can slide in the horizontal direction along the second track 425, and a shaft rod 428 is fixedly mounted on the second slide seat 426, and one end of the shaft rod 428 is fixedly connected to the mounting cover 407;

[0063] A first rack 431 is fixedly mounted on the first mounting rod 414 between the two sets of moving grooves 422. The first rack 431 is located at the lower end of the moving groove 422, and the upper end of the first rack 431 has a smooth section 432. A second gear 429 is fixedly mounted on one end of the worm 408. The second gear 429 is located at the position of the smooth section 432 in the initial state.

[0064] like Figure 3 and Figure 5 As shown, a first T block 415 is fixedly mounted on one end of the first mounting rod 414, and a slide groove 413 (non-through) matching the size of the first T block 415 is provided on the sealing cover 412, and the slide groove 413 is horizontally arranged, so that the first mounting rod 414 can slide horizontally through the cooperation of the first T block 415 and the slide groove 413, and the first T block 415 cannot move in the vertical direction due to the restriction of the bottom of the slide groove 413;

[0065] When the sealing cover 412 is fixedly sleeved on the plastic barrel, the first mounting rod 414 is kept stationary in the vertical direction by the action of the sliding groove 413 on the sealing cover 412, and as the telescopic end of the second cylinder 303 continues to move downward, the first mounting rod 414 gradually extends out of the pressing plate 304 (such as Fig. 9 ), at this time, the first slide seat 419 is acted upon by the second spring 420 and the center rod, so that the first mounting rod 414 is closely attached to the inner wall of the first movable groove away from the end of the first magnet 417;

[0066] Thus, the gradual downward movement of the cover 403 drives the second gear 429 to gradually approach the first rack 431, and the second gear 429 is driven to rotate under the action of the first rack 431, thereby driving the worm gear 406 to rotate, and synchronously driving the fan blade 409 to rotate, so that the air in the plastic barrel can be extracted and discharged through the top plate 401, and when the second gear 429 passes over the first rack 431, the annular cover 433 is tightly attached to the sealing cover 412 (such as Fig. 9 ), and the plug 411 is completely sealed and engaged with the opening of the plastic barrel;

[0067] The controller 101 controls the valve to close the outlet of the top plate 401, and then ventilates the inner cavity of the plastic barrel through the air nozzle 402 until a specified amount of gas is filled and then stops supplying gas. After the plug 411 is kept in a tight state for a certain period of time, the pressure change in the inner cavity of the plastic barrel is detected by the pressure detector, and whether the air tightness of the plastic barrel product is qualified is determined according to the value change;

[0068] Furthermore, by pre-extracting the air in the plastic barrel so that a certain negative pressure state is formed in the plastic barrel, when performing airtightness detection, when a small leak occurs in the plastic barrel, it can be more easily detected. At the same time, since the initial air pressure, humidity, temperature and other factors in the plastic barrel may vary due to environmental changes, the cover 403 is moved downward to make the second gear 429 cooperate with the first rack 431 and drive the fan blade 409 to rotate to extract the air in the plastic barrel. This can achieve a certain volume of gas in the plastic barrel, thereby ensuring that the initial state of the plastic barrel before each detection is more consistent. Compared with relying on valves to control exhaust, it is difficult to accurately control the amount of exhausted gas, resulting in inconsistent initial conditions before the plastic barrel detection, thereby affecting the accuracy of the detection result.

[0069] In order to solve the problem that after the airtightness test of the plastic barrel is completed, due to the high gas pressure in the plastic barrel, if the sealing cover 412 and the plug 411 are directly pulled out of the plastic barrel by the second cylinder 303, the high-pressure gas in the plastic barrel will be easily sprayed out, and the plastic barrel will be easily deformed, such as Figure 3 and Figure 6-Figure 8 As shown, a connecting rod 416 is connected to one end of the first mounting rod 414, and a second mounting rod 434 is fixedly mounted on one end of the connecting rod 416;

[0070] The second mounting rod 434 is movably inserted on the pressing plate 304, and a second movable groove (not shown in the figure) adapted to the width of the second mounting rod 434 is opened on the pressing plate 304, so that the second mounting rod 434 can slide horizontally in the second movable groove, and a second magnet 439 is fixedly installed at one end of the inner wall of the second movable groove away from the first movable groove, and a magnetic material is set on the side of the second mounting rod 434 close to the second magnet 439, and a magnetic material is set on the side of the first mounting rod 414 close to the first magnet 417. In the initial state, the second mounting rod 434 is magnetically connected to the second magnet 439, and there is a certain distance between the first mounting rod 414 and the first magnet 417;

[0071] like Figure 3 , Figure 7 and Figure 10-12 As shown, a second T-block (not shown) is fixedly mounted on one end of the second mounting rod 434, and a limiting groove adapted for use with the second T-block is provided on the sealing cover 412, the limiting groove is horizontally arranged, so that the second mounting rod 434 can slide horizontally through the cooperation between the second T-block and the limiting groove, and the second T-block cannot move in the vertical direction under the restriction of the bottom of the limiting groove;

[0072] When the sealing cover 412 is fixedly sleeved on the plastic barrel, the second mounting rod 434 is kept stationary in the vertical direction by the limiting groove on the sealing cover 412, and as the telescopic end of the second cylinder 303 continues to move downward, the second mounting rod 434 gradually extends out of the pressing plate 304 (such as Fig.10 ), at this time, the second mounting rod 434 is magnetically connected with the second magnet 439, so that the second mounting rod 434 is closely attached to one end of the inner wall of the second movable groove;

[0073] Two groups of push blocks 427 are fixedly installed at the lower end of the slide rod 424, and two groups of first pin blocks 430 are fixedly installed on the first mounting rod 414. The first pin blocks 430 are located at the lower end position of the movable groove 422, so that the cover shell 403 is suitable for moving downward with the telescopic end of the second cylinder 303 to drive the slide rod 424 to move downward synchronously, and the slide rod 424 further drives the push blocks 427 and the second gear 429 to move downward, so that the second gear 429 is in contact with the first rack 431 and rotates, thereby driving the worm gear 406 to rotate, and synchronously driving the fan blades 409 to rotate, so that the air in the plastic barrel can be extracted and discharged through the top plate 401, and when the second gear 429 passes over the first rack 431, the annular cover 433 is tightly attached to the sealing cover 412 (such as Fig.10 ), and the plug 411 is completely sealed and engaged with the opening of the plastic barrel;

[0074] At this time, the push block 427 synchronously contacts the first pin block 430 to push the first mounting rod 414 away from the second gear 429. At this time, the second mounting rod 434 gradually moves away from the second magnet 439, and the second spring 420 is gradually stretched, and synchronously makes the first mounting rod 414 gradually approach the first magnet 417. At this time, the magnetic attraction force of the first magnet 417 on the first mounting rod 414 is greater than the stretching force of the second spring 420, so that the first mounting rod 414 is magnetically attracted to the first magnet 417. At this time, the first rack 431 is away from the second gear 429, and the third gear 438 is at the lower end position of the second rack 436 (such as Fig.12 ), and the right-angle block 437 is at the lower end position of the second pin block 435, thereby completing the pre-extraction of part of the air in the plastic barrel, and avoiding the problem that after the airtightness test of the plastic barrel is completed, the first rack 431 and the second gear 429 are in contact and meshed again, causing the fan blade 409 to rotate in the opposite direction, thereby filling the plastic barrel with air, causing excessive pressure in the plastic barrel, and causing the plastic barrel to deform;

[0075] like Figure 11-Figure 12 As shown, a second rack 436 is fixedly mounted on the second mounting rod 434, a third gear 438 is fixedly mounted on the other end of the worm 408, a right-angle block 437 is fixedly mounted on the side of the mounting cover 407, and a second pin block 435 is fixedly mounted on the second mounting rod 434;

[0076] Therefore, when the airtightness test of the plastic barrel is completed, as the second cylinder 303 is reset, the cover shell 403 is driven to move upward first under the action of the first spring 405, and as the cover shell 403 moves upward, the third gear 438 is driven to move upward and rotate on the second rack 436, thereby driving the fan blade 409 to rotate again, so as to extract part of the high-pressure gas in the plastic barrel and discharge it through the top plate 401, so as to avoid the problem that the gas pressure in the plastic barrel is too high, causing the plastic barrel to be deformed or the gas to spray out;

[0077] As the cover 403 continues to move upward, the right-angle block 437 on the side of the mounting cover 407 gradually approaches the second pin block 435 and pushes the second pin block 435 to push the second mounting rod 434 close to the second magnet 439. At this time, the second spring 420 gradually recovers to a free state, and at the same time, the first mounting rod 414 moves away from the first magnet 417 until the second mounting rod 434 is magnetically attracted to the second magnet 439. As the second cylinder 303 drives the pressing plate 304 to continue to move upward, until the sealing cover 412 is directly above the plastic barrel, the sealing cover 412 is restored to its initial state, so as to facilitate airtightness detection of the next group of plastic barrels.

[0078] It should be noted that, in the initial state, there is a certain gap between the third gear 438 and the second rack 436, and there is a certain gap between the right-angle block 437 and the second pin block 435;

[0079] In summary: during detection, the second cylinder 303 is started to drive the pressure plate 304 to move downward, and the cover shell 403 is suitable for moving downward synchronously with the telescopic end of the second cylinder 303, so as to drive the sliding rod 424 to move downward synchronously, and the sliding rod 424 further drives the push block 427 and the second gear 429 to move downward, so that the second gear 429 is in contact with the first rack 431 and rotates, thereby driving the worm gear 406 to rotate, and synchronously driving the fan blade 409 to rotate, so that the air in the plastic barrel can be extracted and discharged through the top plate 401, and when the second gear 429 passes over the first rack 431, the annular cover 433 is tightly attached to the sealing cover 412 (such as Fig.10 ), and the plug 411 is completely sealed and engaged with the opening of the plastic barrel;

[0080] As the push block 427 gradually contacts the first pin block 430, it is suitable for pushing the first mounting rod 414 away from the second gear 429. At this time, the second mounting rod 434 gradually moves away from the second magnet 439, and the second spring 420 is gradually stretched, and synchronously makes the first mounting rod 414 gradually approach the first magnet 417. At this time, the magnetic attraction force of the first magnet 417 on the first mounting rod 414 is greater than the stretching force of the second spring 420, so that the first mounting rod 414 is magnetically attracted to the first magnet 417. At this time, the first rack 431 is away from the second gear 429, and the third gear 438 is at the lower end position of the second rack 436 (such as Fig.11 ), while the right-angle block 437 is at the lower end position of the second pin block 435;

[0081] After the airtightness test of the plastic barrel is completed, the controller 101 controls the second cylinder 303 to drive the pressure plate 304 to reset. Since the first spring 405 is in a compressed state, the top plate 401 is driven to move up first, and the top plate 401 drives the cover 403 to move up. As the cover 403 moves up, the third gear 438 is driven to move up and rotate on the second rack 436, thereby driving the fan blade 409 to rotate again, so as to extract part of the high-pressure gas in the plastic barrel and discharge it through the top plate 401, so as to avoid the problem that the gas pressure in the plastic barrel is too high, causing the plastic barrel to deform or the gas to spray out;

[0082] As the cover 403 continues to move upward, the right-angle block 437 gradually approaches the second pin block 435 and pushes the second pin block 435 to push the second mounting rod 434 close to the second magnet 439. At this time, the second spring 420 gradually recovers its free state, and at the same time, the first mounting rod 414 moves away from the first magnet 417 until the second mounting rod 434 is magnetically attracted to the second magnet 439. The second cylinder 303 drives the pressing plate 304 to continue to move upward until the sealing cover 412 is directly above the plastic barrel, thereby recovering to the initial state, so as to facilitate airtightness detection of the next group of plastic barrels.

[0083] It should be noted that both the first rack 431 and the second rack 436 have teeth, and the number of teeth on the first rack 431 is less than the number of teeth on the second rack 436, so that the amount of air discharged from the plastic barrel by rotating the fan blade 409 driven by the first rack 431 is less than the amount of air discharged from the plastic barrel by rotating the fan blade 409 driven by the second rack 436, so that after the air-tightness test of the plastic barrel is completed, the fan blade 409 is rotated to extract part of the high-pressure gas in the plastic barrel, which is greater than the amount of gas extracted from the plastic barrel before the air-tightness test of the plastic barrel, and then the sealing cover 412 can be opened smoothly to avoid deformation of the plastic barrel or spraying of high-pressure gas.

[0084] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for testing the air tightness of a plastic barrel, characterized in that: include: A frame (1), the frame (1) having a detection table (102); A lifting mechanism (3), the lifting mechanism (3) being installed on the inspection platform (102), the lifting mechanism (3) comprising a second cylinder (303) and a pressing plate (304) for pressing the cover of the plastic barrel: A top plate (401), the top plate (401) being mounted on the pressure plate (304), the top plate (401) having an outlet, and a valve being provided at the outlet; a cover shell (403), the cover shell (403) being mounted on one end of the top plate (401), the cover shell (403) having an annular cover (433), a plug (411) being mounted on the cover shell (403), a pressure detector being mounted inside the plug (411), and a gas nozzle (402) being mounted on the cover shell (403); A worm wheel (406), the bearing of which is mounted in the annular cover (433), a fan blade (409) being mounted on the worm wheel (406), a mounting cover (407) being mounted on the annular cover (433), a worm (408) meshing with the worm wheel (406) being mounted on the bearing of the mounting cover (407), and a second gear (429) being mounted on one end of the worm (408); Angle pieces (404), the corner pieces (404) being mounted on both sides of the cover shell (403), the corner pieces (404) being mounted with first springs (405), one end of two groups of the first springs (405) being connected to a sealing cover (412), and a limiting ring being mounted on the inner wall of the sealing cover (412); A first mounting rod (414), the first mounting rod (414) being inserted into the pressing plate (304), and a first rack (431) being mounted on the first mounting rod (414); The sealing cover (412) is adapted to move downward along with the telescopic end of the second cylinder (303) so as to cover the plastic barrel, the cover shell (403) is adapted to drive the second gear (429) to move downward so as to be close to the first rack (431), and the second gear (429) is driven to rotate under the action of the first rack (431), thereby driving the fan blade (409) to rotate, so as to extract the air in the plastic barrel.

2. The air tightness testing device for a plastic barrel according to claim 1, characterized in that: The pressing plate (304) is provided with a first movable groove adapted to the width of the first mounting rod (414), and a first magnet (417) is installed at one end of the inner wall of the first movable groove; A mounting seat (421) is mounted on the pressure plate (304), a second spring (420) is mounted on the mounting seat (421), a first track (418) is mounted on a surface of the first mounting rod (414) close to the second spring (420), one end of the second spring (420) is connected to a first slide seat (419), and the first slide seat (419) is slidably mounted on the first track (418).

3. The air tightness testing device for a plastic barrel according to claim 2, characterized in that: A center rod is provided through the center of the second spring (420), one end of the center rod is connected to the first sliding seat (419), and the other end of the center rod movably passes through the mounting seat (421).

4. The air tightness testing device for a plastic barrel according to claim 3, characterized in that: Two groups of movable grooves (422) are provided on one side of the first mounting rod (414) close to the mounting cover (407), and a sliding rod (424) is slidably connected in the two groups of movable grooves (422). A third spring (423) is installed in the movable groove (422), and one end of the third spring (423) is connected to the sliding rod (424).

5. The air tightness testing device for a plastic barrel according to claim 4, characterized in that: A second track (425) is installed on a side of the slide bar (424) close to the detection platform (102), a second slide seat (426) is slidably installed on the second track (425), an axle rod (428) is installed on the second slide seat (426), one end of the axle rod (428) is fixedly connected to the mounting cover (407), the first rack (431) is located at the lower end of the movable groove (422), and the first rack (431) has a smooth section (432); A first T-block (415) is mounted on one end of the first mounting rod (414), and a sliding groove (413) matching the size of the first T-block (415) is provided on the sealing cover (412).

6. The air tightness testing device for a plastic barrel according to claim 5, characterized in that: One end of the first mounting rod (414) is connected to a connecting rod (416), and one end of the connecting rod (416) is installed with a second mounting rod (434), the second mounting rod (434) is movably inserted on the pressure plate (304), and the pressure plate (304) is provided with a second movable groove adapted to the width of the second mounting rod (434), and a second magnet (439) is installed in the second movable groove, and a surface of the second mounting rod (434) close to the second magnet (439) is set to a magnetic material, and a surface of the first mounting rod (414) close to the first magnet (417) is set to a magnetic material.

7. The air tightness testing device for a plastic barrel according to claim 6, characterized in that: A second T-block is mounted on one end of the second mounting rod (434); a limiting groove adapted for use with the second T-block is provided on the sealing cover (412); the second T-block slides in the limiting groove; a second rack (436) is mounted on the second mounting rod (434); and a third gear (438) is fixedly mounted on the other end of the worm (408); Two groups of push blocks (427) are installed at the lower end of the slide rod (424), two groups of first pin blocks (430) are installed on the first mounting rod (414), the first pin blocks (430) are located at the lower end of the movable groove (422), a right-angle block (437) is installed on the side of the mounting cover (407), and a second pin block (435) is installed on the second mounting rod (434).

8. The air tightness testing device for a plastic barrel according to claim 7, characterized in that: The first rack (431) and the second rack (436) both have teeth, and the number of teeth of the first rack (431) is less than the number of teeth of the second rack (436).

9. The air tightness testing device for a plastic barrel according to claim 8, characterized in that: A controller (101) is installed on the frame (1), two sets of slide rails (103) are installed on the frame (1), and a placement table (104) is slidably installed on the two sets of slide rails (103).

10. The air tightness testing device for a plastic barrel according to claim 9, characterized in that: Two sets of limiting mechanisms (2) are installed on the detection platform (102), and the limiting mechanism (2) comprises a mounting frame (201) mounted on the detection platform (102), a first cylinder (202) is installed on the mounting frame (201), and a clamping plate (203) is installed at the telescopic end of the first cylinder (202).

Images