Automatic welding device and process for rupture disk of non-refillable welding steel cylinder

Abstract

According to the automatic welding device and process for the rupture disk of the non-refillable welding steel cylinder, a clamping jaw for driving a cylinder body to rotate and a laser device are used for searching a hole site, in addition, water spraying and welding electrification are controlled through the pressing amplitude during pressing, and linkage of the clamping jaw, the laser device and the water spraying and welding electrification is achieved. According to the clamping jaw, the telescopic rod stretches out and is matched with the driving wheel arranged at the end of the telescopic rod to clamp the cylinder body of the steel cylinder, the cylinder body is rotated through rotation of the driving wheel after clamping, the position of the through hole is detected through the laser device during rotation, and when a signal is detected, the driving wheel is locked; then the robot swings the cylinder body along the plane where the through hole position and the central axis of the steel cylinder are located and descends to the welding position, and therefore the welding hole position is found; besides, during downward pressing welding, the upper electrode is arranged to be of a lifting and buffering structure, when the upper electrode moves upwards to the set height, the valve element is driven to move upwards for water spraying and cooling, meanwhile, electrification is controlled for welding through the pressure value change, caused by rising, of the electronic pressure gauge, and the process is passively controlled; the valve is controlled through a mechanical structure, meanwhile, a circuit is controlled through a pressure gauge feedback signal, and as the waterway reaction is slower than the circuit, the waterway change control circuit can shorten the time difference between the waterway reaction and the circuit, and it is guaranteed that welding and water spraying cooling are basically synchronous.

Description

TECHNICAL FIELD

[0001] The present application relates to steel bottle burst disc automatic welding equipment, and particularly to a non-rechargeable welding steel bottle burst disc automatic welding device and process. BACKGROUND

[0002] Steel bottles are widely used for storing compressed gas. Due to the high pressure of the compressed gas inside, the pressure may suddenly increase due to environmental influences during daily use, which may lead to risks such as explosions.

[0003] In order to solve the sudden high pressure of the steel bottle, the current common practice is to provide a burst disc on the steel bottle to perform emergency pressure relief through damage of the burst disc when the internal pressure abnormally increases to a threshold value, thereby avoiding the occurrence of an explosion.

[0004] The burst disc needs to be welded during installation. However, there are two problems during welding. First, the burst disc welding hole on the steel bottle is located at an eccentric position on the arc top, and it is usually difficult to find the position of the welding hole during welding. Second, high temperature occurs during welding, and therefore water cooling is required. However, the valve control for water cooling and the on-off control of the welding electrode cannot be linked, and multiple sensors are required, which significantly increases the cost. SUMMARY

[0005] The present application solves the technical problems in the prior art, and provides a non-rechargeable welding steel bottle burst disc automatic welding device and process.

[0006] The technical scheme adopted by the present application to solve the above technical problems is as follows: The non-rechargeable welding steel bottle burst disc automatic welding device comprises, a welding device comprising a central welding position and an offset detection position, a set of laser devices for emitting and receiving laser light being provided at the detection position; a burst disc feeding device for feeding the burst disc to the welding device; a bottle body clamping device comprising a multi-degree-of-freedom robot and two clamping jaws provided at the output end of the robot; The clamping jaws comprise: a drive seat reversibly provided at the output end of the robot, the inside of the drive seat being provided with a drive structure and the drive seat having an extension rod, a connecting rod being rotatably provided on the extension rod; a jaw body comprising two parts and being hingedly connected to the drive seat, one end of the jaw body being hingedly connected to the connecting rod and being clamped when the extension rod is pushed out; a pressing wheel rotatably provided on the clamping jaw for pressing against the bottle body to clamp and limit the axial sliding of the bottle body; A driving wheel is arranged at the end of the telescopic rod and located at the opening of the two claw bodies; when the telescopic rod is extended and the pressing wheel presses the bottle body, the driving wheel abuts against the bottle body and can drive the bottle body to rotate; When the bottle body clamping device clamps the bottle body to the preset position, the bottle body is in a vertical posture, the bottle body is driven to rotate by the driving wheel, and laser detection is performed by the laser device; when the laser is detected, the welding through hole is positioned, the rotation of the bottle body is stopped, and the blasting sheet welding hole on the bottle body is accurately welded to the position by moving the fixed stroke by the robot.

[0007] Preferably, the laser device comprises a laser emitting device and a laser receiving device, and the area of the light spot is equal to the aperture of the welding through hole.

[0008] Preferably, the telescopic rod has a hollow section, and a servo motor and a transmission structure are arranged at the hollow section; the servo motor drives the driving wheel to rotate through the transmission structure.

[0009] Preferably, the welding device comprises: a machine table; a base rotatably arranged on the base and provided with a lower electrode; a lifting seat driven to ascend and descend by a driving device, and provided with a rotatable limiting column extending into the welding through hole for limiting and a rotatable copper wheel arranged around the limiting column; the limiting column and the copper wheel press the middle and the edge of the blasting sheet respectively, and the edge of the blasting sheet is welded when the base rotates.

[0010] Preferably, the lifting seat is provided with an inner cavity, the inner cavity is divided into an upper cavity and a lower cavity by a piston plate arranged in the inner cavity, the piston plate is provided with a mounting column, the mounting column is provided with a spring and a valve core, the spring exerts pressure on the valve core to block the water inlet of the water spraying pipe in a natural state, the upper cavity is provided with an electronic pressure gauge, the electronic pressure gauge feeds back the pressure to control the on-off of the electrode, the side and the bottom of the lower cavity are respectively provided with a water inlet pipe and a drainage channel, and the drainage channel is slidably sealed with a water spraying pipe for cooling the welding position, the water spraying pipe is provided with a jacking trigger device, and when the water spraying pipe is jacked by the jacking trigger device, the upper valve core is jacked, and the piston plate is driven to rise to trigger the pressure gauge to increase the pressure.

[0011] Preferably, the jacking trigger device is a lifting slider slidably arranged on the lifting seat, the copper wheel is arranged on the slider through a wheel frame, the lifting slider is located below the bottom end of the water spraying pipe and jacks up the water spraying pipe when it rises, and the upper side wall of the water spraying pipe is provided with a water leakage hole or a water leakage gap.

[0012] As preferred, the lifting seat is provided with a top-closed copper pipe, a buffer piston, a buffer spring and a pressing frame are sequentially arranged in the copper pipe from top to bottom, the buffer spring is sleeved on the piston rod of the buffer piston, the pressing frame is slidingly arranged in the copper pipe and the pressing frame first compresses the spring and then abuts against the piston rod when moving upward, and the bottom of the pressing frame is provided with a pressing groove matched with the copper wheel.

[0013] As preferred, the bursting disc feeding device comprises a vibrating feeder and a suction feeder, the suction feeder sucks the bursting disc and places it on the welding device. Compared with the prior art, the application has the following advantages: the clamping jaw is arranged as an extension rod, the steel cylinder body is clamped by the extension rod and the driving wheel arranged at the end of the extension rod, the cylinder body is rotated by the rotation of the driving wheel after clamping, the position of the through hole is detected by the laser device during rotation, the driving wheel is locked when the signal is detected, the cylinder body is swung along the plane where the through hole position and the steel cylinder central axis are located and is lowered to the welding position by the robot, so that the welding hole position is found; in addition, the upper electrode is arranged as a lifting and buffering structure during downward welding, the valve core is driven to move upward for water cooling when the upper electrode moves to the set height, the welding is controlled by the change of the pressure value of the electronic pressure gauge caused by the upward movement, the process is passive control, the valve is controlled by the mechanical structure and the circuit is controlled by the feedback signal of only one pressure gauge, and the time difference between the water circuit and the circuit can be shortened by the water circuit change control circuit, so that the welding and water cooling are basically synchronized. BRIEF DESCRIPTION OF DRAWINGS

[0014] The application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the application, and in addition, the drawings are not necessarily drawn to scale unless specifically indicated.

[0015] Figure 1 is a front view of the application; Figure 2 is a perspective view of the application; Figure 3 is a perspective view of the robot; Figure 4 is a perspective view of the bursting disc feeding part and the welding part; Figure 5 is a perspective view of the lifting seat; Figure 6 is a sectional view of the rear part of the lifting seat; In the figure: 10, machine table; 20, vibration feeder; 30, suction feeder; 40, welding device; 401, base; 402, laser device; 4021, laser emitting device; 4022, laser receiving device; 403, lifting seat; 4031, copper pipe; 4033, upper cavity; 4034, lower cavity; 4035, spring; 4036, valve core; 4037, water spraying pipe; 404, pressing frame; 405, copper wheel; 4051, lifting slide; 406, water inlet pipe; 50, robot; 501, driving seat; 502, claw body; 5021, circular arc segment; 503, connecting rod; 505, pressing wheel; 506, driving motor; 507, bevel gear; 508, driving wheel. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present application will be described in detail below with reference to the attached drawings, which should be considered in conjunction with the description. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of protection of the present application.

[0017] It should be noted that similar reference numerals in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it can no longer be further defined and explained in subsequent drawings. EMBODIMENT

[0018] The present embodiment mainly describes the title of the automatic welding device and process for non-reusable filling welded steel cylinder burst disc, which is as follows: The automatic welding device for non-reusable filling welded steel cylinder burst disc, as shown in Figures 1-6 , includes a welding device 40, which includes a central welding position and an offset detection position, and a set of laser devices 402 for emitting and receiving laser at the detection position; A burst disc feeding device for feeding the burst disc to the welding device 40; A bottle body clamping device, which includes a multi-degree-of-freedom robot 50 and two clamping jaws arranged at the output end of the robot 50; The clamping jaw includes: A driving seat 501, which is reversibly arranged at the output end of the robot 50, has a driving structure inside, and has a telescopic rod driven by an electric push rod or a telescopic cylinder, and the connecting rod 503 is rotatably arranged on the telescopic rod; The claw body 502 includes two and is hingedly connected to the driving seat 501, one end of which is hingedly connected to the connecting rod 503 and clamped when the telescopic rod is pushed out, and has a circular arc segment 5021; The pressing wheel 505 is rotatably arranged on the circular arc segment 5021 of the clamping jaw to press the bottle body and clamp the bottle body to limit the axial sliding of the bottle body; The drive wheel 508 is located at the end of the telescopic rod and at the opening of the two claw bodies 502; when the telescopic rod extends and the pressure roller 505 presses the bottle body, the drive wheel 508 abuts against the bottle body and can drive the bottle body to rotate. When the bottle gripping device clamps the bottle to the preset position, the bottle is in a vertical position. The drive wheel 508 drives the bottle to rotate, and at the same time, the laser device 402 emits a laser to detect it. When the laser is detected, the welding through hole is located, the rotation of the bottle stops, and the robot 50 moves a fixed stroke to accurately weld the rupture disc welding hole on the bottle. In this solution, the gripper is set as a telescopic rod that extends and works with the drive wheel 508 at the end of the telescopic rod to clamp the cylinder. After clamping, the bottle is rotated by the rotation of the drive wheel 508. During rotation, the laser device 402 detects the position of the through hole. When a signal is detected, the drive wheel 508 locks, and then the robot 50 swings the bottle along the plane where the through hole position and the central axis of the cylinder are located and descends to the welding position, thus realizing the search for the welding hole position.

[0019] Preferably, the laser device 402 includes a laser emitting device 4021 and a laser receiving device 4022, the area of ​​which is equal to the diameter of the welding through hole. The laser is blocked when the bottle rotates, and a signal is detected only when the welding hole rotates to the point where the welding through hole is located on the laser irradiation path. The laser spot includes several laser beams, and high-frequency simultaneous irradiation is used during irradiation. The arithmetic mean of the distance values ​​is calculated, and the maximum value of the arithmetic mean of the distance values ​​is used as the standard. Furthermore, when irradiating directly, a side-tilted irradiation method is used, such as rear-side irradiation. When swinging, the bottom of the bottle swings forward to accommodate the movements of the robot 50, simplifying the robot 50's actions.

[0020] Preferably, the telescopic rod has a hollow section, in which a servo motor and a transmission structure are installed. The servo motor drives the drive wheel 508 to rotate through the transmission structure. The transmission structure includes a drive shaft, a wheel axle, and a set of bevel gears 507 mounted on the drive shaft and wheel axle.

[0021] Preferably, the welding apparatus 40 includes: 10 machines; The base 401 is rotatably mounted on the machine base 10 and has a lower electrode on it; The lifting seat 403 is driven to rise and fall by a drive device. It is equipped with a rotatable limiting post for insertion and positioning through a welding through hole, and a rotatable copper wheel 405 is arranged around the limiting post. The limiting post and the copper wheel 405 respectively press the center and edge of the rupture disc. When the base 401 rotates, the upper electrode sweeps around to weld the edge of the rupture disc. The welding device 40 is a resistance welding device, which uses resistance heat as a heat source to locally heat the workpiece and simultaneously apply pressure to achieve welding of the rupture disc. In this solution, the copper wheel 405 is a pressing component, which is used for pressing down and energizing.

[0022] As preferred, the lifting seat 403 is provided with an inner cavity, a piston plate is arranged in the inner cavity, and the piston plate divides the inner cavity into an upper cavity 4033 and a lower cavity 4034, the piston plate is provided with a mounting column, a spring 4035 and a valve core 4036 are arranged on the mounting column, the spring 4035 exerts pressure on the valve core 4036 in a natural state to block the water inlet of the shower pipe 4037, an electronic pressure gauge is arranged at the upper cavity 4033, the electronic pressure gauge feeds back the on-off electricity of the control electrode, a water inlet pipe 406 and a drainage passage are respectively arranged at the side and the bottom of the lower cavity 4034, the shower pipe 4037 is slidably arranged in the drainage passage, the shower pipe 4037 is used for cooling the welding position, a jacking trigger device is arranged at the shower pipe 4037, when the shower pipe 4037 is jacked by the jacking trigger device, the upper valve core 4036 is pressed, and the piston plate is driven to rise to trigger the pressure gauge to increase the pressure. The valve core 4036 is slidably arranged on the end of the mounting column, and the valve core 4036 always wraps the end when the valve core 4036 slides on the end. In the scheme, the shower pipe 4037 is jacked and moves upward, the whole piston plate and the components thereon are jacked, the pressure gauge at the upper cavity 4033 increases the pressure gauge value, and in this process, the pressure preset value is triggered to be greater than the water pressure, so that the water pressure does not affect the process.

[0023] As preferred, the jacking trigger device is a lifting slider 4051 slidably arranged on the lifting seat 403, the copper wheel 405 is arranged on the lifting slider 4051 through a wheel frame, the lifting slider 4051 is below the bottom end of the shower pipe 4037 and jacks the shower pipe 4037 when the lifting slider 4051 rises, and the upper side wall of the shower pipe 4037 is provided with a water leakage hole or a water leakage gap. When the lifting slider 4051 rises, the shower pipe 4037 is jacked upward to trigger the pressure gauge to increase the pressure, so that the controller controls the power-on, when the base 401 rotates to a set angle, the welding is completed, the lifting seat 403 rises, the pressure gauge value decreases, the controller controls the power-off, and at the same time, the valve core 4036 jacks the shower pipe 4037 downward and blocks the drainage passage.

[0024] As preferred, the lifting seat 403 is provided with a copper pipe 4031 with a closed top, the copper pipe 4031 is sequentially provided with a buffer piston, a buffer spring and a lower pressing frame 404 from top to bottom, the lower pressing frame 404 is slidably and rotatably arranged in the copper pipe 4031, the buffer spring is sleeved on the piston rod of the buffer piston and the top end of the buffer spring abuts against a step face arranged in the copper pipe 4031, the lower pressing frame 404 is slidably arranged in the copper pipe 4031 and abuts against the piston rod after compressing the spring when the lower pressing frame 404 moves upward, and the bottom of the lower pressing frame 404 is provided with a lower pressing groove matched with the copper wheel 405. The scheme realizes soft contact by arranging two sets of buffer structures when pressing, avoids that the pressure is too large to cause the deformation of the bursting disc in an instant, and adjusts the pressing force of the lower pressing by arranging a space to fill gas and arranging a gas nozzle and other structures on the side to change the amount and composition of the gas.

[0025] As preferred, the rupture disc feeding device comprises a vibrating feeder 20 and a suction feeder 30 which sucks the rupture disc and places it on the welding device 40. Two suction nozzles and a placing table are used in the suction process, the first suction nozzle is responsible for the feeding between the vibrating feeder 20 and the placing table, and the other suction nozzle is responsible for the feeding of the rupture disc between the placing table and the base 401, so that the distance of the lateral movement of the suction feeder 30 can be halved.

[0026] The rupture disc welding process is welded by the above-mentioned non-rechargeable welding cylinder rupture disc automatic welding device, and specifically comprises the following steps: S1, hole opening, two holes are synchronously opened in the middle of the arc top of the cylinder body and the eccentric position by a hole opener, wherein the hole in the eccentric position is used for welding the rupture disc; S2, rupture disc feeding, the rupture disc is placed in the welding position by the rupture disc feeding device through vibration and then suction; S3, cylinder body clamping and position adjustment, the cylinder body in the fixed position is clamped and taken out by the gripper on the robot and rotated to the detection position above the welding position, and then the cylinder body is driven to rotate by the driving wheel and the eccentric hole position is detected by the laser device, when the laser signal is detected during the detection, the rotation speed of the driving wheel is slowed down and the driving wheel is rotated in both directions with a small amplitude, until the arithmetic average value of the laser emission distance value is maximum, and then the rotation is stopped, wherein the laser spot is composed of multiple laser beams; S4, welding, the lifting seat is lowered, the copper wheel is pressed to the welding position of the rupture disc, at this time, the lifting slide is raised to lift the water spraying pipe, the water spraying pipe is lifted, the water supply is opened, the piston plate is lifted, the pressure in the upper cavity is increased, and the pressure gauge controls the power supply to the two electrodes.

[0027] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

Claims

1. An automatic welding device for rupture discs on non-refillable welded steel cylinders, characterized in that, include, The welding apparatus includes a central welding position and an offset detection position, wherein a set of laser devices for emitting and receiving lasers is provided at the detection position; A rupture disc feeding device is used to feed rupture discs onto a welding device; A bottle gripping device, comprising a multi-degree-of-freedom robot and two grippers located at the robot's output end; The grippers include: The drive base is rotatably mounted on the output end of the robot. It has a drive structure inside and a telescopic rod with a connecting rod rotating on the telescopic rod. The claw body comprises two claws, each hinged to the drive seat, with one end hinged to the connecting rod and clamping when the telescopic rod is extended. The pressure roller is rotatably mounted on the gripper to press against the bottle body and clamp the bottle body, restricting the axial sliding of the bottle body; The drive wheel is located at the end of the telescopic rod and at the opening of the two claws; when the telescopic rod extends and the pressure roller presses the bottle body tightly, the drive wheel abuts against the bottle body and can drive the bottle body to rotate. When the bottle gripping device clamps the bottle to the preset position, the bottle is in a vertical position. The bottle is driven to rotate by the drive wheel, and at the same time, the laser device emits a laser to detect it. When the laser is detected, the welding through hole is positioned, the rotation of the bottle is stopped, and the welding hole of the rupture disc on the bottle can be accurately welded by the robot moving to a fixed stroke.

2. The automatic welding device for non-refillable welded steel cylinder rupture discs according to claim 1, characterized in that, The laser device includes a laser emitting device and a laser receiving device, and the area of ​​its laser spot is equal to the diameter of the through hole used for welding.

3. The automatic welding device for non-refillable welded steel cylinder rupture discs according to claim 1, characterized in that, The telescopic pole has a hollow section, in which a servo motor and a transmission structure are installed. The servo motor drives the drive wheel to rotate through the transmission structure.

4. The automatic welding device for non-refillable welded steel cylinder rupture discs according to claim 1, characterized in that, The welding apparatus includes: Machine tool; A base, which is rotatably mounted on a base, and a lower electrode is provided on it; The lifting base is driven to rise and fall by a drive device. It is equipped with a rotatable limiting post for extending into and limiting through a welding through hole, and a rotatable copper wheel is provided around the limiting post. The limiting post and the copper wheel press the middle and edge of the rupture disc respectively. When the base rotates, the upper electrode sweeps around to weld the edge of the rupture disc.

5. The automatic welding device for non-refillable welded steel cylinder rupture discs according to claim 4, characterized in that, The lifting seat has an inner cavity, inside which is a piston plate that divides the inner cavity into an upper cavity and a lower cavity. The piston plate has a mounting post, on which are a spring and a valve core. In its natural state, the spring applies pressure to the valve core to block the inlet of the water spray pipe. An electronic pressure gauge is located in the upper cavity, which provides feedback to control the on / off state of the pressure control electrode. The lower cavity has an inlet pipe and a drain channel on its side and bottom, respectively. A water spray pipe is slidably sealed in the drain channel. The water spray pipe is used to spray water to cool the welded area. A lifting trigger device is located at the water spray pipe. When the water spray pipe is lifted by the lifting trigger device, it presses up the valve core, which in turn drives the piston plate to rise, triggering the pressure gauge to increase its pressure.

6. The automatic welding device for rupture discs of non-refillable welded steel cylinders according to claim 5, characterized in that, The lifting triggering device is a lifting slider that is slidably set on the lifting seat. The copper wheel is set on the slider through the wheel frame. The lifting slider is located below the bottom end of the water spray pipe and lifts the water spray pipe when it rises. The upper side wall of the water spray pipe is provided with a water leakage hole or water leakage gap.

7. The automatic welding device for rupture discs of non-refillable welded steel cylinders according to claim 6, characterized in that, The lifting seat is equipped with a copper tube with a closed top. Inside the copper tube, from top to bottom, there are a buffer piston, a buffer spring, and a lower pressure frame. The buffer spring is sleeved on the piston rod of the buffer piston. The lower pressure frame is slidably set inside the copper tube. When the lower pressure frame moves upward, it first compresses the spring and then abuts against the piston rod. The bottom of the lower pressure frame is equipped with a lower pressure groove that matches the copper wheel.

8. The automatic welding device for non-refillable welded steel cylinder rupture discs according to claim 1, characterized in that, The rupture disc feeding device includes a vibrating feeder and a suction feeder, which picks up the rupture discs and places them onto the welding device.

9. A rupture disc welding process, characterized in that, The welding process using the automatic welding device for non-refillable welded steel cylinder rupture discs as described in claim 6 specifically includes the following steps: S1, opening holes: Two holes are simultaneously opened at the center of the arc top of the bottle body and at an eccentric position using a hole-opening machine. The hole at the eccentric position is used for welding the rupture disc. S2, Fracturing disc feeding: The rupture disc is placed at the welding position by a rupture disc feeding device that uses vibration followed by suction. S3, Bottle gripping and position adjustment: The robot's grippers pick up the bottle from its fixed position and rotate it to the detection position above the welding position. A drive wheel drives the bottle to rotate, and a laser device detects the eccentric hole position. During detection, when a laser signal is detected, the drive wheel speed slows down and rotates slightly in both directions until the arithmetic mean of the calculated laser emission distance is maximized, at which point the rotation stops. The laser spot consists of multiple laser beams. S4, Welding, the lifting seat descends, the copper wheel presses against the welding position of the rupture disc, at this time the lifting slider rises to lift the water spray pipe, the water spray pipe lifts the valve core, the water supply is opened, the piston plate is lifted, the pressure in the upper cavity increases, and the pressure gauge controls the power supply to the two electrodes.

Images