Gas cylinder airtightness test device

Abstract

The utility model relates to the technical field of gas cylinder airtightness testing, and particularly provides a gas cylinder airtightness testing device, which comprises a base, a gas cylinder conveying belt is arranged on the base, the gas cylinder conveying belt comprises a first conveying belt and a second conveying belt, a water tank is arranged between the first conveying belt and the second conveying belt, and a gas cylinder taking and placing mechanism is arranged above a gas cylinder conveying mechanism; an inflation and deflation mechanism and a plurality of rotating shafts are arranged in the pool, the inflation and deflation mechanism comprises a lifting mechanism, a fixed table and inflation connectors, the fixed table is arranged on one axial side of the rotating shafts in a liftable mode through the lifting mechanism, a plurality of fixed plates are arranged on the fixed table, and each fixed plate is rotationally connected with one inflation connector; and the inflating joint is respectively connected with the pressure release valve and the inflating pump. According to the utility model, the automation degree of the gas cylinder airtightness test can be improved, the manpower is saved, the gas cylinder can be overturned by the rotating shaft in the water tank, the position of a leakage point can be observed more easily by overturning the gas cylinder, and the efficiency and effect of the gas cylinder airtightness test are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtightness testing of gas cylinders, and particularly relates to an airtightness testing device for gas cylinders. Background Art

[0002] Gas cylinders are pressure vessels used to fill compressed gases, liquefied gases and other gases, and are widely used. It is very important that the gas cylinders have good airtightness. If there is leakage in the gas cylinders, it may not only lead to the leakage of the medium, causing environmental pollution, but also pose dangers such as explosion, threatening the safety of personnel. To ensure safety and use effect, the gas cylinders must pass the airtightness test to ensure that their airtightness is qualified.

[0003] Currently, most gas cylinder airtightness testing devices need to manually pressurize each gas cylinder one by one, and then move the gas cylinders to a water tank for testing. Moreover, the positions of the gas cylinders in the water tank are relatively fixed, and it is difficult for the test personnel to directly observe the leakage positions. The existing gas cylinder airtightness testing devices waste a lot of manpower and have low efficiency. Content of the Utility Model

[0004] To solve the problems in the background art, an airtightness testing device for gas cylinders includes a base. A gas cylinder conveyor belt is provided on the base. The gas cylinder conveyor belt includes a first conveyor belt and a second conveyor belt. The first conveyor belt and the second conveyor belt have the same conveying direction. A water tank is arranged between the first conveyor belt and the second conveyor belt. A gas cylinder picking and placing mechanism is provided above the gas cylinder conveying mechanism. The first conveyor belt, the second conveyor belt and the water tank are all within the working area of the gas cylinder picking and placing mechanism. An air charging and discharging mechanism and a plurality of rotating shafts with the same diameter are arranged in the water tank. The air charging and discharging mechanism includes a lifting mechanism, a fixed platform and an air charging joint. The fixed platform is arranged on one side of the axial direction of the rotating shaft in a liftable manner through the lifting mechanism. A plurality of fixing plates are provided on the fixed platform. Each fixing plate is rotatably connected with one air charging joint. The air charging joints are respectively connected with a pressure relief valve and an air charging pump through air pipes. The plurality of fixing plates and the plurality of rotating shafts are all arranged along the conveying direction of the gas cylinder conveyor belt.

[0005] Preferably, the lifting mechanism includes a driving motor, a screw rod, a lifting platform and a sliding rod. One end of the sliding rod is fixedly connected with the bottom of the water tank. The driving motor is fixed at the bottom of the water tank. One end of the screw rod is connected with the output end of the driving motor. The lifting platform is threadedly connected with the screw rod and is slidably connected with the sliding rod. The fixed platform is fixed on the lifting platform.

[0006] Preferably, a limiting plate is fixed at one end of the sliding rod away from the bottom of the water tank. One end of the screw rod away from the driving motor is rotatably connected with the limiting plate.

[0007] Preferably, a partition is fixed in the water tank. The partition divides the water tank into a first area and a second area. The rotating shaft and the air charging and discharging mechanism are respectively arranged in the first area and the second area. One end of the rotating shaft is rotatably connected to the partition, and the other end of the rotating shaft is rotatably connected to the side wall of the water tank. The height of the partition is lower than the height of the side wall of the water tank.

[0008] Preferably, limiting mechanisms are arranged on the sides of the first conveyor belt and the second conveyor belt away from the air charging and discharging mechanism. The limiting mechanism includes a first screw motor, a first guide rod, a connecting plate and a pushing plate. One end of the first guide rod and the first screw motor are fixed on the base. The first guide rod and the screw of the first screw motor are horizontally arranged and perpendicular to the gas cylinder conveyor belt. The connecting plate is fixed on the driving nut of the first screw motor, and the connecting plate is slidably arranged on the first guide rod. The pushing plate is fixed on the side of the connecting plate close to the gas cylinder conveyor belt; baffles are arranged at positions opposite to the limiting mechanisms on the sides of the first conveyor belt and the second conveyor belt close to the air charging and discharging mechanism.

[0009] Preferably, the gas cylinder picking and placing mechanism includes a fixing frame, a first driving mechanism, a second driving mechanism and a plurality of grasping arms. The first driving mechanism includes a third screw motor and a third guide rod. The third screw motor and the third guide rod are fixed above the gas cylinder conveyor belt through the fixing frame. The screw of the third screw motor and the third guide rod are arranged along the conveying direction of the gas cylinder conveyor belt. A first moving frame is slidably arranged on the third guide rod, and the first moving frame is fixedly connected to the driving nut of the third screw motor;

[0010] The second driving mechanism includes a fourth screw motor and a fourth guide rod. The fourth screw motor and the fourth guide rod are fixed at the bottom of the first moving frame. The screw of the fourth screw motor and the fourth guide rod are horizontally arranged and perpendicular to the conveying direction of the gas cylinder conveyor belt. A second moving frame is slidably arranged on the fourth guide rod, and the second moving frame is fixedly connected to the driving nut of the fourth guide rod;

[0011] A second screw motor and a second guide rod are fixed at the bottom of the second moving frame. The screw of the second screw motor and the second guide rod are arranged vertically. An installation plate is slidably arranged on the second guide rod, and the installation plate is fixedly connected to the driving nut of the second screw motor. The grasping arms are fixed at the bottom of the installation plate, and the plurality of grasping arms are arranged in a rectangular array.

[0012] Preferably, there are at least two rows of grasping arms along the length direction of the fourth guide rod. Each row includes at least eight grasping arms, and the plurality of grasping arms in each row are arranged along the length direction of the third guide rod.

[0013] Preferably, the grasping arm is a vacuum pneumatic suction cup.

[0014] Preferably, a plurality of semi-cylindrical protrusions are evenly arranged along the outer circumference of the first conveyor belt. The distance between the axes of two adjacent semi-cylindrical protrusions is equal to the distance between the axes of two adjacent rotating shafts, and the diameter of the semi-cylindrical protrusion is the same as the diameter of the rotating shaft.

[0015] Preferably, the inflation joint is rotationally connected to the fixed plate and the fixed table through a pneumatic rotary joint, and the inflation joint is connected to a trachea connected with a pressure relief valve and an air pump through the pneumatic rotary joint.

[0016] The beneficial effects of the present utility model are as follows: The present utility model improves the automation degree of the airtightness inspection of gas cylinders. Through the present utility model, the transmission, pressurization, airtightness detection and pressure relief of gas cylinders can be carried out, greatly reducing manual intervention and improving the detection efficiency. At the same time, a plurality of rotating shafts are provided in the water tank of the present utility model, and the rotating shafts can drive the gas cylinders to rotate, realizing the turnover of the gas cylinders in the water tank, enabling the gas cylinders to be more comprehensively displayed, so that the inspectors can more intuitively observe whether there is leakage in the gas cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model Figure 1 ;

[0018] Figure 2 is a schematic diagram of the overall structure of the present utility model Figure 2 ;

[0019] Figure 3 is a schematic diagram of the structure at the water tank of the present utility model;

[0020] Figure 4 is a schematic diagram of the structure of the limiting mechanism of the present utility model;

[0021] Figure 5 is a schematic diagram of the side structure of the first conveyor belt of the present utility model;

[0022] Figure 6 is a schematic diagram of the structure of the gas cylinder picking and placing mechanism of the present utility model;

[0023] Figure 7 is a schematic diagram of the structure of the pneumatic rotary joint of the present utility model;

[0024] Figure 8 is a cross-sectional view of the connection between the fixed table and the fixed plate and the pneumatic rotary joint of the present utility model.

[0025] Reference numerals in the figure: 1, base; 2, first conveyor belt; 3, second conveyor belt; 4, water tank; 5, rotating shaft; 6, gas cylinder; 7, gas cylinder picking and placing mechanism; 8, gas charging and discharging mechanism; 9, limiting mechanism; 10, lifting platform; 11, driving motor; 12, screw rod; 13, sliding rod; 14, fixed platform; 15, fixing plate; 16, inflation joint; 17, limiting plate; 18, partition plate; 19, first lead screw motor; 20, first guide rod; 21, connecting plate; 22, pushing plate; 23, baffle plate; 24, fixing frame; 25, second lead screw motor; 26, second guide rod; 27, third lead screw motor; 28, third guide rod; 29, first moving frame; 30, fourth lead screw motor; 31, fourth guide rod; 32, second moving frame; 33, mounting plate; 34, grasping arm; 35, semi-cylindrical protrusion; 36, operation panel; 37, pneumatic rotary joint. Detailed implementation manner

[0026] In order to make the present utility model clearer and more understandable, the technical solutions of the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments given are only one of the implementation manners and do not represent all embodiments.

[0027] In this article, terms such as "vertical, horizontal, up, down" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope.

[0028] Combined with the attached Figure 1 - Attached Figure 8 , a gas cylinder airtightness test device, including a base 1, a gas cylinder conveyor belt is provided on the base 1, the gas cylinder conveyor belt includes a first conveyor belt 2 and a second conveyor belt 3, the conveying directions of the first conveyor belt 2 and the second conveyor belt 3 are the same, a water tank 4 is arranged between the first conveyor belt 2 and the second conveyor belt 3, a gas cylinder picking and placing mechanism 7 is arranged above the gas cylinder conveying mechanism, and the first conveyor belt 2, the second conveyor belt 3 and the water tank 4 are all located within the working area of the gas cylinder picking and placing mechanism 7; specifically, the gas cylinder picking and placing mechanism 7 includes a fixing frame 24, a first driving mechanism, a second driving mechanism and a plurality of grasping arms 34, the first driving mechanism includes a third lead screw motor 27 and a third guide rod 28, the third lead screw motor 27 and the third guide rod 28 are fixed above the gas cylinder conveyor belt through the fixing frame 24, the lead screw of the third lead screw motor 27 and the third guide rod 28 are arranged along the conveying direction of the gas cylinder conveyor belt, a first moving frame 29 is slidably arranged on the third guide rod 28, and the first moving frame 29 is fixedly connected with the driving nut of the third lead screw motor 27;

[0029] The second driving mechanism includes a fourth lead screw motor 30 and a fourth guide rod 31. The fourth lead screw motor 30 and the fourth guide rod 31 are fixed to the bottom of the first moving frame 29. The lead screw of the fourth lead screw motor 30 and the fourth guide rod 31 are horizontally arranged and perpendicular to the conveying direction of the gas cylinder conveyor belt. A second moving frame 32 is slidably arranged on the fourth guide rod 31, and the second moving frame 32 is fixedly connected to the driving nut of the fourth guide rod 31.

[0030] A second lead screw motor 25 and a second guide rod 26 are fixed to the bottom of the second moving frame 32. The lead screw of the second lead screw motor 25 and the second guide rod 26 are arranged vertically. An installation plate 33 is slidably arranged on the second guide rod 26, and the installation plate 33 is fixedly connected to the driving nut of the second lead screw motor 25. The grasping arm 34 is fixed to the bottom of the installation plate 33, and a plurality of the grasping arms 34 are arranged in a rectangular array.

[0031] More specifically, at least two rows of the grasping arms 34 are arranged along the length direction of the fourth guide rod 31, that is, to ensure that each gas cylinder 6 can be grasped by at least two grasping arms 34 to ensure the stability of the grasping of the gas cylinder 6. Each row includes at least eight grasping arms 34. A plurality of the grasping arms 34 in each row are arranged along the length direction of the third guide rod 28. The grasping arm 34 preferably adopts a vacuum pneumatic suction cup. The vacuum pneumatic suction cup is connected to a vacuum pump through a ventilation pipeline. The vacuum pump works to make the vacuum pneumatic suction cup generate an adsorption force, and the gas cylinder 6 is grasped by using the adsorption force. It is a conventional technology for the vacuum pump to make the vacuum pneumatic suction cup generate / cancel the adsorption force, which will not be elaborated here. The gas cylinder 6 is grasped by using the vacuum pneumatic suction cup to adsorb the gas cylinder 6, and the grasping point can only appear above the gas cylinder. The distance between two adjacent gas cylinders 6 will not affect the grasping action of the grasping arm 34.

[0032] The water tank 4 is a cubic water tank 4, which can store water as needed for airtight detection. An air charging and discharging mechanism 8 and a plurality of rotating shafts 5 with the same diameter are arranged in the water tank 4. The air charging and discharging mechanism 8 includes a lifting mechanism, a fixed platform 14 and an air charging joint 16. The fixed platform 14 is arranged on one side of the axial direction of the rotating shaft 5 through the lifting mechanism in a liftable manner. Specifically, the lifting mechanism includes a driving motor 11, a screw rod 12, a lifting platform 10 and a sliding rod 13. One end of the sliding rod 13 is fixedly connected to the bottom of the water tank 4, and a limiting plate 17 is fixed to the other end of the sliding rod 13. The driving motor 11 is fixed to the bottom of the water tank 4. One end of the screw rod 12 is connected to the output end of the driving motor 11, and the other end of the screw rod 12 is rotatably connected to the limiting plate 17. The lifting platform 10 is threadedly connected to the screw rod 12 and is slidably connected to the sliding rod 13. The fixed platform 14 is fixed to the lifting platform 10.

[0033] A plurality of fixing plates 15 are provided on the fixing table 14, and each fixing plate 15 is rotatably connected with a gas filling joint 16. The gas filling joint 16 is respectively connected with a pressure relief valve and a gas filling pump through a gas pipe, or the gas filling joint 16 is only connected with a gas filling pump having a pressure relief mechanism through a gas pipe; the plurality of fixing plates 15 and the plurality of rotating shafts 5 are arranged along the conveying direction of the gas cylinder conveyor belt;

[0034] Specifically, the gas filling joint 16 is rotatably connected with the fixing plate 15 and the fixing table 14 through a pneumatic rotary joint 37, and the gas filling joint 16 is connected with a gas pipe connected with a pressure relief valve and a gas filling pump through the pneumatic rotary joint 37. The pneumatic rotary joint 37 includes two relatively rotatable parts, one part of which is fixedly connected with the fixing plate 15 and the fixing table 14, and the other part is fixedly connected with the gas filling joint 16. The pneumatic rotary joint 37 can realize the relative rotation of the gas filling joint 16 and the gas pipe, avoiding the gas pipe connected to the gas filling joint 16 from following the rotation when the gas filling joint 16 rotates, causing the gas pipe to be wound or bent, thereby avoiding affecting the normal rotation of the gas filling joint 16 and the ventilation effect of the gas pipe.

[0035] Specifically, a plurality of semi-cylindrical protrusions 35 are evenly provided on the outer periphery of the first conveyor belt 2 along the conveyor belt. The distance between the axes of two adjacent semi-cylindrical protrusions 35 is equal to the distance between the axes of two adjacent rotating shafts 5, and the diameter of the semi-cylindrical protrusion 35 is the same as the diameter of the rotating shaft 5. The gas cylinders 6 transported by the first conveyor belt 2 are placed between two semi-cylindrical protrusions 35. The semi-circular protrusions can limit the distance between two adjacent gas cylinders 6. When the gas cylinder picking and placing mechanism 7 transfers a plurality of gas cylinders 6 from the first conveyor belt 2 to the pool 4, it can ensure that a plurality of gas cylinders 6 are sequentially placed between the rotating shafts 5.

[0036] More specifically, let the midline of the distance between two adjacent rotating shafts 5 be L. The distance between two adjacent lines L, the center distance between two adjacent gripping arms 34 in each row of gripping arms 34, and the center distance between two adjacent gas filling joints 16 are all the same, ensuring that after the gripping arm 34 grabs the gas cylinder 6, it can dock the gas cylinder 6 with the corresponding gas filling joint 16, and the gas cylinder 6 can be located between two rotating shafts 5 after the position of the gas filling joint 16 drops.

[0037] When two adjacent rotating shafts 5 or two adjacent semi-circular protrusions lift the gas cylinder 6, the position of the axis of the gas cylinder 6 will be determined, that is, it can ensure that the distance between the axes of two adjacent gas cylinders 6 is certain. Whether the size of the gas cylinder 6 is small or large, the rotating shaft 5 and the semi-circular protrusion can limit the axis position of the gas cylinder 6 at a specific position, so as to realize the airtightness test of gas cylinders 6 of different sizes.

[0038] Specifically, a partition plate 18 is fixed in the water tank 4. The partition plate 18 divides the water tank 4 into a first area and a second area. The rotating shaft 5 and the air charging and discharging mechanism 8 are respectively arranged in the first area and the second area. One end of the rotating shaft 5 is rotatably connected to the partition plate 18, and the other end of the rotating shaft 5 is rotatably connected to the side wall of the water tank 4. The height of the partition plate 18 is lower than the height of the side wall of the water tank 4. The partition plate 18 provides an installation position for one end of the rotating shaft 5, and the purpose of making the height of the partition plate 18 lower than the height of the side wall of the water tank 4 is to ensure that the inflation joint 16 can be lifted and lowered after being connected to the gas cylinder 6, and to avoid the partition plate 18 blocking the gas cylinder 6 or the inflation joint 16, so that the inflation joint 16 cannot be lifted and lowered after being connected to the gas cylinder 6, and thus the gas cylinder 6 cannot be placed on the rotating shaft 5 when connected to the inflation joint 16. More specifically, one end of the rotating shaft 5 connected to the side wall of the water tank 4 extends out of the water tank 4. A rotary seal for preventing water leakage is provided at the connection between the rotating shaft 5 and the water tank 4. A synchronous pulley is fixed to the extended end of the rotating shaft 5. The synchronous pulleys on multiple rotating shafts 5 are connected by a synchronous belt. One of the rotating shafts 5 is connected to a motor for driving the rotation of the rotating shaft 5. The cooperation of the synchronous belt and the synchronous pulley can make multiple rotating shafts 5 rotate synchronously and at the same speed. The rotation mode of the rotating shaft 5 is not limited to the above structure.

[0039] More specifically, the driving motor 11 is a waterproof motor and is directly placed in the water tank 4, or the driving motor 11 is fixed outside the water tank 4. The output end of the driving motor 11 is connected to a transmission shaft. The end of the transmission shaft away from the driving motor 11 is rotatably connected to the side wall of the water tank 4 and extends into the water tank 4. A rotary seal for preventing water leakage is provided at the connection between the transmission shaft and the water tank 4. A first bevel gear is provided at one end of the transmission shaft located in the water tank 4. A second bevel gear is fixed to the bottom end of the screw 12. The driving of the screw 12 by the driving motor 11 is realized through the meshing of the two bevel gears.

[0040] Specifically, on the sides of the first conveyor belt 2 and the second conveyor belt 3 away from the gas charging and discharging mechanism 8, there are limit mechanisms 9. The limit mechanism 9 includes a first screw motor 19, a first guide rod 20, a connecting plate 21 and a push plate 22. One end of the first guide rod 20 and the first screw motor 19 are fixed on the base 1. The first guide rod 20 and the screw of the first screw motor 19 are horizontally arranged and perpendicular to the gas cylinder conveyor belt. The connecting plate 21 is fixed on the driving nut of the first screw motor 19, and the connecting plate 21 is slidably arranged on the first guide rod 20. The push plate 22 is fixed on the side of the connecting plate 21 close to the gas cylinder conveyor belt. At the positions on the sides of the first conveyor belt 2 and the second conveyor belt 3 close to the gas charging and discharging mechanism 8 opposite to the limit mechanism 9, there are baffles 23. The first screw motor 19 drives the push plate 22 to move. The push plate 22 pushes the gas cylinder 6 in the direction close to the baffle 23 until the gas cylinder 6 contacts the baffle 23. The push plate 22 and the baffle 23 limit the gas cylinder 6 to make the gas cylinders 6 on the conveyor belt arranged neatly. More specifically, by setting the length dimensions of the push plate 22 and the baffle 23, the push plate 22 and the baffle 23 can limit no less than eight gas cylinders 6 at one time, and the baffle 23 and the limit mechanism 9 at the first conveyor belt 2 are preferably arranged at a position close to the end of the operation of the first conveyor belt 2.

[0041] Specifically, at one end of the push plate 22 close to the water tank 4, there is a sensor for detecting the position of the gas cylinder 6. The sensor can be an infrared sensor. When the sensor detects a gas cylinder 6, the first conveyor belt 2 pauses transmission. The gas cylinder picking and placing mechanism 7 removes a plurality of gas cylinders 6 on the first conveyor belt 2 close to the water tank 4 from the first conveyor belt 2. At this time, the sensor does not detect a gas cylinder 6, and the first conveyor belt 2 starts to transport the gas cylinders 6 again. Such cyclic actions are performed.

[0042] Specifically, it further includes a control module. The control module includes an operation panel 36 with a display screen and a controller. The operation panel 36 is respectively connected to the sensor, the driving device of the rotating shaft, the driving device of the gas cylinder conveyor belt, the driving motor 11, the first screw motor 19, the second screw motor 25, the third screw motor 27, the fourth screw motor 30, the vacuum pump, the air inflation pump and the pressure relief valve through the controller. The operation panel 36 and the controller control the actions of each component and coordinate the working relationships among the components. Using the controller and the control panel to control the components to work belongs to conventional technical means and will not be elaborated here.

[0043] Workflow: There is water in the water tank 4. The gas cylinders 6 to be detected are placed on the first conveyor belt 2 in sequence. The first conveyor belt 2 moves the gas cylinders 6 towards the direction close to the water tank 4. After moving to a position close to the water tank 4, the first conveyor belt 2 pauses. The third lead screw motor 27 of the gas cylinder picking and placing mechanism 7 starts to rotate forward, driving the first moving frame 29 to move above the first conveyor belt 2, so that the grasping arm 34 corresponds to the position of the gas cylinder 6 to be grasped. After the corresponding position is reached, the first lead screw motor 19 stops driving. The second lead screw motor 25 starts to rotate forward, driving the grasping arm 34 to move downwards close to the gas cylinder 6 to grasp the gas cylinder 6. After the grasping arm 34 picks up the gas cylinder 6, the second lead screw motor 25 rotates reversely, driving the grasping arm 34 with the gas cylinder 6 to move upwards, lifting multiple gas cylinders 6 at the same time. After the grasping arm 34 moves to the required height (at this height, the bottle mouths of the grasped gas cylinders 6 are at the same height as the inflation connectors 16), the second lead screw motor 25 stops driving. The first lead screw motor 19 starts to rotate reversely, driving the grasping arm 34 with the gas cylinder 6 to move above the water tank 4 until the bottle mouths of multiple gas cylinders 6 correspond to the positions of multiple inflation connectors 16 one by one. After the corresponding position is good, the first lead screw motor 19 stops driving. The fourth lead screw motor 30 starts to rotate forward, driving the second moving frame 32 to drive the grasping arm 34 and the grasped gas cylinder 6 to move towards the direction close to the inflation connector 16 until the bottle mouth of the gas cylinder 6 is docked with the inflation connector 16. After the bottle mouth of the gas cylinder 6 is docked with the inflation connector 16, the fourth lead screw motor 30 stops driving. The air inflation pump starts, and inflates the gas cylinder 6 through the inflation connector 16. After the inflation is completed, the air inflation pump stops working. The second lead screw motor 25 starts to rotate forward, driving the grasping arm 34 to move downwards. At the same time, the drive motor 11 of the lifting mechanism rotates reversely, driving the inflation connector 16 to move downwards. The inflation connector 16 and the grasping arm 34 move downwards at the same speed. When the gas cylinder 6 moves down to the rotating shaft 5, the grasping arm 34 releases the gas cylinder 6. At this time, the gas cylinder 6 is immersed in water, and the rotating shaft 5 starts to rotate, driving the gas cylinder 6 to rotate, and starts to detect the air tightness of the gas cylinder 6.

[0044] After the detection is completed, the rotating shaft 5 stops rotating, the pressure relief valve opens, and the gas cylinder 6 is deflated and depressurized. After the pressure relief is completed, the grasping arm 34 grasps the gas cylinder 6 again. The fourth lead screw motor 30 starts to rotate reversely, driving the gas cylinder 6 to move away from the inflation connector 16, so that the gas cylinder 6 is separated from the inflation connector 16; after the gas cylinder 6 is separated from the inflation connector 16, the fourth lead screw motor 30 stops driving. The second lead screw motor 25 starts to rotate reversely, moving the grasped gas cylinder 6 to a height slightly higher than the upper surface of the second conveyor belt 3. Then the second lead screw motor 25 stops driving. The first lead screw motor 19 starts to rotate reversely again, moving the gas cylinder 6 above the second conveyor belt 3. The grasping arm 34 releases the gas cylinder 6, so that the gas cylinder 6 falls on the second conveyor belt 3. The second conveyor belt 3 transports the detected gas cylinder 6 away from the air tightness detection device.

[0045] After the gas cylinder 6 is separated from the inflation connector 16, while the second lead screw motor 25 rotates in reverse, the drive motor 11 starts to rotate forward to drive the inflation connector 16 to rise and return to its original position. After the gas cylinder 6 falls on the second conveyor belt 3, the inspection personnel manually mark or directly remove the gas cylinder 6 with airtightness problems.

[0046] Although the embodiments of the present utility model have been shown and described, various changes, modifications, substitutions, and variations can be made to these embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An airtight test device for gas cylinders, comprising a base (1), characterized in that: A gas cylinder conveyor belt is provided on the base (1). The gas cylinder conveyor belt includes a first conveyor belt (2) and a second conveyor belt (3). The conveying directions of the first conveyor belt (2) and the second conveyor belt (3) are the same. A water pool (4) is arranged between the first conveyor belt (2) and the second conveyor belt (3). A gas cylinder picking and placing mechanism (7) is provided above the gas cylinder conveying mechanism. The first conveyor belt (2), the second conveyor belt (3) and the water pool (4) are all located within the working area of the gas cylinder picking and placing mechanism (7). An air charging and discharging mechanism (8) and a plurality of rotating shafts (5) with the same diameter are arranged in the water pool (4). The air charging and discharging mechanism (8) includes a lifting mechanism, a fixed platform (14) and an air charging joint (16). The fixed platform (14) is arranged on one side of the axial direction of the rotating shaft (5) in a liftable manner through the lifting mechanism. A plurality of fixing plates (15) are arranged on the fixed platform (14). One air charging joint (16) is rotatably connected to each fixing plate (15). The air charging joint (16) is connected to a pressure relief valve and an air charging pump through air pipes respectively. The plurality of fixing plates (15) and the plurality of rotating shafts (5) are all arranged along the conveying direction of the gas cylinder conveyor belt.

2. The airtight test device for gas cylinders according to claim 1, characterized in that: The lifting mechanism includes a driving motor (11), a screw rod (12), a lifting platform (10) and a sliding rod (13). One end of the sliding rod (13) is fixedly connected to the bottom of the water pool (4). The driving motor (11) is fixed to the bottom of the water pool (4). One end of the screw rod (12) is connected to the output end of the driving motor (11). The lifting platform (10) is threadedly connected to the screw rod (12), and the lifting platform (10) is slidably connected to the sliding rod (13). The fixed platform (14) is fixed on the lifting platform (10).

3. The airtight test device for gas cylinders according to claim 2, characterized in that: A limiting plate (17) is fixed to one end of the sliding rod (13) away from the bottom of the water pool (4). One end of the screw rod (12) away from the driving motor (11) is rotatably connected to the limiting plate (17).

4. A gas cylinder airtightness test device according to claim 1, characterized in that: A partition plate (18) is fixed in the water pool (4). The partition plate (18) divides the water pool (4) into a first area and a second area. The rotating shaft (5) and the air charging and discharging mechanism (8) are respectively arranged in the first area and the second area. One end of the rotating shaft (5) is rotatably connected to the partition plate (18), and the other end of the rotating shaft (5) is rotatably connected to the side wall of the water pool (4). The height of the partition plate (18) is lower than the height of the side wall of the water pool (4).

5. The airtight test device for gas cylinders according to claim 1, wherein: On one side of the first conveyor belt (2) and the second conveyor belt (3) away from the air charging and discharging mechanism (8), a limiting mechanism (9) is provided. The limiting mechanism (9) includes a first screw motor (19), a first guide rod (20), a connecting plate (21) and a pushing plate (22). One end of the first guide rod (20) and the first screw motor (19) are fixed on the base (1). The screw rod of the first screw motor (19) and the first guide rod (20) are horizontally arranged and perpendicular to the gas cylinder conveyor belt. The connecting plate (21) is fixed on the driving nut of the first screw motor (19), and the connecting plate (21) is slidably arranged on the first guide rod (20). The pushing plate (22) is fixed on one side of the connecting plate (21) close to the gas cylinder conveyor belt. At a position opposite to the limiting mechanism (9) on one side of the first conveyor belt (2) and the second conveyor belt (3) close to the air charging and discharging mechanism (8), a baffle (23) is provided.

6. The airtight test device for gas cylinders according to claim 1, characterized in that: The gas cylinder picking and placing mechanism (7) includes a fixed frame (24), a first driving mechanism, a second driving mechanism and a plurality of grasping arms (34). The first driving mechanism includes a third screw motor (27) and a third guide rod (28). The third screw motor (27) and the third guide rod (28) are fixed above the gas cylinder conveyor belt through the fixed frame (24). The screw rod of the third screw motor (27) and the third guide rod (28) are arranged along the conveying direction of the gas cylinder conveyor belt. A first moving frame (29) is slidably arranged on the third guide rod (28), and the first moving frame (29) is fixedly connected to the driving nut of the third screw motor (27). The second driving mechanism includes a fourth screw motor (30) and a fourth guide rod (31). The fourth screw motor (30) and the fourth guide rod (31) are fixed at the bottom of the first moving frame (29). The screw rod of the fourth screw motor (30) and the fourth guide rod (31) are horizontally arranged and perpendicular to the conveying direction of the gas cylinder conveyor belt. A second moving frame (32) is slidably arranged on the fourth guide rod (31), and the second moving frame (32) is fixedly connected to the driving nut of the fourth guide rod (31). A second screw motor (25) and a second guide rod (26) are fixed at the bottom of the second moving frame (32). The screw rod of the second screw motor (25) and the second guide rod (26) are arranged vertically. An installation plate (33) is slidably arranged on the second guide rod (26), and the installation plate (33) is fixedly connected to the driving nut of the second screw motor (25). The grasping arms (34) are fixed at the bottom of the installation plate (33), and the plurality of grasping arms (34) are arranged in a rectangular array.

7. The airtight test device for gas cylinders according to claim 6, characterized in that: At least two rows of the grasping arms (34) are arranged along the length direction of the fourth guide rod (31). Each row includes at least eight grasping arms (34). The plurality of grasping arms (34) in each row are arranged along the length direction of the third guide rod (28).

8. A gas cylinder airtightness test device according to claim 7 or 6, characterized in that: The grasping arm (34) is a vacuum pneumatic suction cup.

9. The airtight test device for gas cylinders according to claim 1, characterized in that: A plurality of semi-cylindrical protrusions (35) are uniformly arranged along the outer periphery of the conveyor belt on the first conveyor belt (2). The distance between the axes of two adjacent semi-cylindrical protrusions (35) is equal to the distance between the axes of two adjacent rotating shafts (5). The diameter of the semi-cylindrical protrusion (35) is the same as the diameter of the rotating shaft (5).

10. A gas cylinder airtightness test device according to claim 1, characterized in that: The inflation joint (16) is rotatably connected to the fixed plate (15) and the fixed table (14) through a pneumatic rotary joint (37), and the inflation joint (16) is connected to a trachea connected with a pressure relief valve and an air pump through the pneumatic rotary joint (37).

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