A device for detecting defective spring tube welding

Abstract

The application relates to the field of spring tube detection, in particular to a spring tube poor welding detection device, which comprises a box body, a gas injection part arranged on the box body and used for connecting a spring tube and injecting gas into the spring tube, a detection part opposite to the gas injection part and used for detecting the deformation of the spring tube after the gas is filled, a controller used for receiving an electrical signal output by the detection part and solving to judge whether the spring tube deformation meets a standard, and a signal part controlled by the controller and used for outputting a qualified signal when the spring tube deformation meets the standard, so that the deformation of the spring tube after the gas is filled is used as the detection standard, the spring tube poor welding condition can be better detected, and the detection deviation is reduced.

Description

Technical Field

[0001] This application relates to the field of Bourdon tube testing, and in particular to a testing device for defective welding of Bourdon tubes. Background Technology

[0002] The Bourdon tube is one of the most important components of a pressure gauge. It deforms differently depending on the pressure of the medium as it enters. For example, in a C-shaped Bourdon tube, the outer diameter increases after medium enters. The pressure of the medium is displayed based on the deformation of the Bourdon tube. Pressure gauge manufacturing begins with welding, where sealing plates and threaded connectors are welded to the two ends of the Bourdon tube. After welding, an overpressure test is performed to ensure welding quality.

[0003] An automatic welding equipment with the publication number CN214868188U is used to test the airtightness of the spring tube after welding. This involves filling the threaded end of the spring tube with gas at a certain pressure. If the spring tube leaks, the gas injected into the spring tube cannot reach the standard pressure, indicating that the spring tube has a welding defect.

[0004] Regarding the aforementioned technologies, if the spring has poor welding due to sealing defects, the gas pressure inside the spring tube can still reach the standard pressure when tested with an airtightness tester. This makes it difficult to distinguish the poor welding of the spring tube, resulting in a significant deviation in the spring tube welding test. Summary of the Invention

[0005] To reduce the deviation in the welding inspection of spring tubes, this application provides a detection device for defective welding of spring tubes.

[0006] The technical solution of the detection device for defective welding of spring tube provided in this application is as follows.

[0007] A detection device for defective welding of a Bourdon tube includes a housing, an injection unit disposed in the housing for connecting the Bourdon tube and injecting gas into the Bourdon tube, a detection element facing the injection unit to detect the deformation of the Bourdon tube after gas injection, a controller that receives the electrical signal output by the detection element and calculates it to determine whether the deformation of the Bourdon tube meets the standard, and a signal element controlled by the controller to output a qualified signal when the deformation of the Bourdon tube meets the standard.

[0008] By adopting the above technical solution, the spring tube will deform when a certain pressure of gas is introduced into it, causing a change in the outer diameter of the spring tube. This reduces the minimum distance between the spring tube and the detection element. Only when the spring tube is properly welded can it produce the predetermined deformation under a certain pressure, allowing the minimum distance between the spring tube and the detection element to reach the preset trigger value in the controller. This ensures that the controller will only control the signal element to send a qualified signal when the spring tube is functioning normally. This allows operators to clearly classify the spring tubes according to whether or not a qualified signal is present, improving the accuracy of the detection and reducing deviations.

[0009] Optionally, the detection component includes a photoelectric switch, the signal component includes a signal lamp, the housing is provided with a lamp plate for setting the signal component, the lamp plate is hinged to a detection plate for setting the detection component, the detection plate is located directly above the gas injection section, and the hinge point of the detection plate is located at the upper part of the detection plate.

[0010] By adopting the above technical solution, the detection plate can be flipped over when installing or removing the spring tube corresponding to the gas injection part, thus improving the convenience of spring tube installation and removal.

[0011] Optionally, the gas injection unit includes a gas-fixing tube fixedly connected to the housing and threadedly connected to the spring tube for injecting gas into the spring tube.

[0012] By adopting the above technical solution, threaded connections can be made using threaded joints on the spring tube, eliminating the need for additional connection structures.

[0013] Optionally, the gas injection unit includes a dynamic gas pipe inserted into the housing and threadedly connected to the spring tube to inject gas into the spring tube, a tube plate fixedly connected to the dynamic gas pipe and detachably connected to the housing, and several dynamic gas pipes are provided.

[0014] By adopting the above technical solution, when testing multiple Bourdon tubes at once, all Bourdon tubes can be easily removed or installed in the corresponding housing, effectively improving testing efficiency.

[0015] Optionally, the tube sheet is provided with several guide rods that can be inserted into the box body. The length of the guide rods inserted into the box body is greater than the length of the air pipe inserted into the box body. A sealing block is fixed to each air pipe on the surface of the tube sheet facing the box body. The sealing block is tightly inserted into the box body.

[0016] By adopting the above technical solution, the guide rod is inserted into the housing, and then the air pipe is correspondingly inserted into the housing to facilitate the installation work. Even if the tube sheet is placed directly on the platform or the ground, the air pipe is not likely to come into contact with the platform or the ground, so that the air pipe is not easily damaged. The sealing block can further ensure that the pressure of the air pipe sending gas into the spring tube is not lower than the standard pressure.

[0017] Optionally, the housing is slidably connected to a plug that can be inserted into a guide rod so that the guide rod is always located inside the housing. The plug is fixedly connected to a central rod. The housing is provided with a plug spring that abuts against the central rod to force the plug to be tightly inserted into the guide rod. The central rod is fixedly connected to a rack. A knob is rotatably connected to the outer wall of the housing. The knob is coaxially fixedly connected to a central gear that meshes with the rack.

[0018] By adopting the above technical solution, rotating the knob can control the insertion or removal of the plug from the guide rod, so as to tightly connect or disassemble the tube sheet to the corresponding housing.

[0019] Optionally, the end of the guide rod is hemispherical, and the side of the insert block facing the tube sheet is formed with a push-in surface, and the hemispherical end of the guide rod can abut against the push-in surface to allow the insert block to move.

[0020] By adopting the above technical solution, when installing the tube sheet into the corresponding housing, there is no need to turn the knob. Simply insert the guide rod into the corresponding housing and press the tube sheet down, which makes the installation convenient.

[0021] Optionally, the housing is slidably connected to a push rod that can abut against the end of the guide rod. The housing is provided with a rod spring that forces the push rod to move toward the tube plate. The outer wall of the guide rod is provided with a block groove that extends through to one hemispherical end of the guide rod. The block groove allows the end of the insert block to slide so that the push rod can abut against the insert block.

[0022] By adopting the above technical solution, after the knob is turned and the insert block is disengaged from the guide rod, the push rod can push the guide rod up a certain distance until the push rod abuts against the insert block, so as to remove the tube sheet from the housing.

[0023] Optionally, the detection plate is provided with an upper ring and the lamp plate is provided with a lower ring. A tension spring is detachably connected between the upper ring and the lower ring to force the upper ring and the lower ring to move closer together. The height of the lower ring is lower than the height of the rotation point of the detection plate.

[0024] By adopting the above technical solution, the detection plate is less likely to wobble due to vibrations similar to those of other equipment in the workshop during testing. This makes it less likely for the distance between the detection plate and the spring tube to change, thus improving the accuracy of the test results. Furthermore, when the tube plate is removed from the box, the flipped detection plate is less likely to flip back down.

[0025] Optionally, the light panel is fixedly connected to a flat plate that can abut against the detection plate facing the housing.

[0026] By adopting the above technical solution, the detection plate is kept parallel to the tube sheet, which makes it less likely for the distance between each detection component and the spring tube to change, thereby improving the accuracy of the detection results.

[0027] In summary, this application includes at least one of the following beneficial effects: 1. Operators can clearly classify Bourdon tubes according to whether or not they have a qualified signal, which improves the accuracy of the test and reduces the deviation; 2. When testing multiple Bourdon tubes at once, all Bourdon tubes can be easily removed or installed in the corresponding housing, effectively improving testing efficiency. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of Embodiment 1 of this application; Figure 2 This is a structural schematic diagram of Embodiment 2; Figure 3 This is a schematic diagram of the structure in Embodiment 2, in which the tube sheet and the lamp plate are moved away from the upper part of the box, and the vertical side of the box is cut off.

[0029] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Injection section; 3. Detection component; 31. Lower ring; 32. Flat plate; 33. Protruding strip; 34. Middle rod; 35. Limiting block; 4. Controller; 41. Block rack; 42. Knob; 43. Middle gear; 44. Push inclined surface; 45. Push rod; 46. Rod spring; 47. Block groove; 48. Upper ring; 49. Tension spring; 5. Signal component; 51. Light board; 52. Detection plate; 53. Fixed air tube; 54. Moving air tube; 55. Tube plate; 56. Guide rod; 57. Sealing block; 58. Insertion block; 59. Insertion block spring. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1: Embodiment 1 of this application discloses a detection device for defective welding of spring tubes, referring to... Figure 1 The system includes a box 1 placed on the ground. Several gas injection sections 2 are evenly installed on the horizontal upper surface of the box 1. The gas injection sections 2 are connected to the spring tubes and supply gas at a certain pressure into the spring tubes. In this embodiment, a C-type spring tube detection is used as an example. A vertical lamp plate 51 is fixedly connected to one side of the upper surface of the box 1 along its length. Several signal elements 5 are evenly fixed on the upper part of the vertical side of the lamp plate 51 facing the box 1. A protrusion 33 is integrally formed on the side of the lamp plate 51 where the signal elements 5 are located. The length direction of the protrusion 33 is consistent with the length direction of the box 1. A detection plate 52 is hinged to the side of the protrusion 33 away from the lamp plate 51. The rotation axis of the detection plate 52 is consistent with the length direction of the box 1. The hinge point of the detection plate 52 is located on the upper part of the protrusion 33, so that when the detection plate 52 is flat, it is not easy to continue to flip downward.

[0032] Reference Figure 1When the detection plate 52 is flipped up, the side of the detection plate 52 away from the protrusion 33 can abut against the upper side of the lamp plate 51, making it less likely for the detection plate 52 to come into contact with the signal element 5. Several detection elements 3 are evenly fixedly connected to the lower surface of the detection plate 52 when it is flat. Each spring tube corresponds to one detection element 3 and one signal element 5. All detection elements 3 and signal elements 5 are electrically connected to a controller 4. The controller 4 can be set inside the housing 1 or on the vertical side of the lamp plate 51 away from the housing 1. In this embodiment, for ease of demonstration, the controller 4 is set on the side of the lamp plate 51 away from the housing 1.

[0033] During testing, the Bourdon tube deforms due to the presence of pressurized gas. For example, the outer diameter of a C-type Bourdon tube will increase. If the Bourdon tube is properly welded (i.e., there is no blockage or leakage), its outer diameter will expand to a predetermined value, reducing the distance between the Bourdon tube and the detection element 3 to a fixed value. Therefore, the detection element 3 can be a photoelectric switch. The detection element 3 can detect the distance between itself and the Bourdon tube and send an electrical signal to the controller 4 in real time. The controller 4 can be a microcontroller to calculate the electrical signal input from the detection element 3 in real time, thus matching the distance between the detection element 3 and the Bourdon tube with the preset distance within the controller 4. The distance between the detection element 3 and the Bourdon tube is compared with the preset distance value or a preset distance range. When the distance between the detection element 3 and the Bourdon tube is equal to the preset distance value in the controller 4 or within the preset distance range, the controller 4 controls the signal element 5 to send a qualified signal to the operator. The signal element 5 can be a signal light, and the qualified signal can be a green light emitted by the signal element 5. The operator can then record the detected Bourdon tubes according to whether the signal element 5 sends a qualified signal. After the detection stops, the Bourdon tubes are classified. The Bourdon tubes without a qualified signal are recycled and reprocessed, while the Bourdon tubes with a qualified signal are used for subsequent pressure gauge assembly and manufacturing.

[0034] Reference Figure 1 The gas injection unit 2 includes several gas-fixing pipes 53 fixedly connected to the upper surface of the housing 1. The gas-fixing pipes 53 are vertical, and each gas-fixing pipe 53 has a threaded connector for a spring tube at the center of its upper surface. One end of the gas-fixing pipe 53 located in the housing 1 can be connected to an air pump, pressure regulating valve, and pressure gauge (not shown in the figure) located inside the housing 1, so as to adjust the gas pressure in the spring tube according to different detection needs.

[0035] The implementation principle of the detection device for poor welding of spring tube in Embodiment 1 of this application is as follows: the spring tube is connected to the corresponding gas stationary tube 53, the detection plate 52 is flipped down, and then the gas stationary tube 53 sends gas of a certain pressure into the spring tube, so that the outer diameter of the spring changes. During this process, the detection element 3 detects the distance between itself and the spring tube in real time. When the distance between the detection element 3 and the spring tube reaches the preset standard in the controller 4, the controller 4 controls the signal element 5 to send a qualified signal, indicating that the corresponding spring tube is well welded. Spring tubes without a qualified signal have welding problems such as leakage or blockage.

[0036] Example 2: Embodiment 2 of this application discloses a detection device for defective welding of spring tubes. The difference from Embodiment 1 is that, referring to… Figure 2 and Figure 3 The gas injection section 2 includes a dynamic gas pipe 54. The dynamic gas pipe 54 has the same structure and function as the constant gas pipe 53 in Embodiment 1, the only difference being that the dynamic gas pipe 54 is tightly inserted into the housing 1. All dynamic gas pipes 54 are fixedly connected to the same tube plate 55, which abuts against the upper surface of the housing 1, so that all dynamic gas pipes 54 can be disassembled or installed, effectively improving the detection efficiency. A sealing block 57 is fixedly connected to the lower surface of the tube plate 55 for each dynamic gas pipe 54. The sealing block 57 is fixedly connected to the corresponding dynamic gas pipe 54 and is tightly inserted into the housing 1 in the vertical direction, so that the dynamic gas pipe 54 and the housing 1 can achieve good sealing performance.

[0037] Reference Figure 3 Vertical guide rods 56 are fixedly connected to the four corners of the lower surface of the tube sheet 55. The bottom end of the guide rod 56 is hemispherical. A set of insert blocks 58 are slidably connected to both ends of the length direction inside the box 1. Two insert blocks 58 are set along the width direction of the box 1. Each insert block 58 can be inserted into the circumferential side of the guide rod 56 along the length direction of the box 1. A push-in inclined surface 44 is formed on the upper surface of the insert block 58 where it is inserted into the guide rod 56, so that when the guide rod 56 is inserted into the box 1 and moves downward, the guide rod 56 can abut against the push-in inclined surface 44 to move the insert block 58.

[0038] Reference Figure 2 and Figure 3 Each insert 58 is fixedly connected to a vertical central rod 34. Inside the housing 1, a corresponding insert spring 59 is fixedly connected to each central rod 34. The insert spring 59 can be fixedly connected to or abut against the central rod 34, so that the central rod 34 moves toward the nearby guide rod 56. Two central rods 34 located at the same end along the length of the housing 1 form a group. The bottom ends of the two central rods 34 are fixedly connected. The bottom ends of the two central rods 34 away from the lamp plate 51 are fixedly connected to a rack 41. The length direction of the rack 41 is consistent with the length direction of the housing 1. The two racks 41 are meshed with the same central gear 43 at their close points. The central gear 43 is rotatably connected to the inside of the housing 1. The central gear 43 is coaxially fixedly connected to a knob 42 rotatably connected to the outer wall of the housing 1. Rotating the knob 42 causes the central gear 43, rack 41, central rods 34 and insert 58 to move synchronously, allowing the insert 58 to disengage from the guide rod 56. Releasing the knob 42 allows the insert 58 to be tightly inserted into the guide rod 56 under the action of the insert spring 59.

[0039] Reference Figure 3Inside the housing 1, a push rod 45 is provided for each guide rod 56. The push rod 45 moves vertically, and its upper end face can abut against the bottom end of the guide rod 56. Inside the housing 1, a rod spring 46 is provided for each push rod 45, and the rod spring 46 pushes the push rod 45 upward. A block groove 47 is formed on the outer circumference of the guide rod 56, which is vertical and extends through the bottom end of the guide rod 56. The upper end of the block groove 47 is connected to the opening of the guide rod 56 for the insertion of the insertion block 58. The insertion block 58 can slide within the block groove 47. A limiting block 35 is fixedly connected inside the housing 1, which can abut against the end face of the block rack 41 near the middle gear 43. When the block rack 41 abuts against the limiting block 35, the insertion block 58 is aligned with the block groove 47. At this time, the push rod 45 can push the guide rod 56 upward until the push rod 45 abuts against the lower surface of the insertion block 58, so that the push rod 45 is not prone to excessive movement.

[0040] Reference Figure 2 and Figure 3 The detection plate 52 has an upper ring 48 rotatably connected to both vertical sides. The rotation axis of the upper ring 48 is in the same direction as the length direction of the housing 1. The lamp plate 51 has a lower ring 31 rotatably connected to both vertical sides. The rotation axis of the lower ring 31 is in the same direction as the rotation axis of the upper ring 48. The upper ring 48 and the lower ring 31 are hooked together by the same tension spring 49. The tension spring 49 forces the upper ring 48 to move closer to the lower ring 31. The height of the lower ring 31 is lower than the rotation point height of the detection plate 52. When the detection plate 52 is flat, the tension spring 49 forces the detection plate 52 to remain horizontal. When the detection plate 52 is flipped to abut against the upper part of the lamp plate 51, the tension spring 49 forces the detection plate 52 to press tightly against the lamp plate 51, so that the detection plate 52 is not easy to rotate after it is flipped up or down. The lamp plate 51 is fixedly connected to a horizontal plate 32. The upper surface of the plate 32 abuts against the horizontal lower surface of the flat detection plate 52, so that the pressure between the detection plate 52 and the lower part of the protrusion 33 is not too large under the action of the tension spring 49, so that the detection plate 52 can be kept horizontally, and the distance between each detection element 3 and the spring tube is not too different.

[0041] The implementation principle of the detection device for defective welding of spring tubes in Embodiment 2 of this application is as follows: When the detection is completed, turn the knob 42 to make the tube plate 55 pop up a certain distance, then release the knob, take out the tube plate 55 and remove it, and then install the tube plate 55, which has been installed with the spring tubes, into the housing 1. First, insert the guide rod 56 into the housing 1, and then press the tube plate 55 down until the tube plate 55 is tightly attached to the housing 1 to complete the installation. Then, the detection plate 52 is flipped down to start the detection.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting defective welding of spring tubes, characterized in that: The system includes a housing (1), an injection unit (2) located in the housing (1) for connecting to the Bourdon tube and injecting gas into the Bourdon tube, a detection element (3) positioned opposite the injection unit (2) to detect the deformation of the Bourdon tube after gas injection, a controller (4) receiving and processing the electrical signal output by the detection element (3) to determine whether the deformation of the Bourdon tube meets the standard, and a signal element (5) controlled by the controller (4) to output a qualified signal when the deformation of the Bourdon tube meets the standard; the injection unit (2) includes components inserted into the housing (1) for threaded connection to the Bourdon tube. A gas-injecting pipe (54) for injecting gas into the spring tube, and a tube plate (55) fixedly connected to the gas-injecting pipe (54) and detachably connected to the housing (1), wherein several gas-injecting pipes (54) are provided; the tube plate (55) is provided with several guide rods (56) that can be inserted into the housing (1), the length of the guide rods (56) inserted into the housing (1) is greater than the length of the gas-injecting pipes (54) inserted into the housing (1), and a sealing block (57) is fixed on the surface of the tube plate (55) facing the housing (1) for each gas-injecting pipe (54), sealing Block (57) is tightly inserted into the box (1); a plug (58) that can be inserted into the guide rod (56) so that the guide rod (56) is always located in the box (1) is slidably connected inside the box (1), the plug (58) is fixedly connected to the middle rod (34), the box (1) is provided with a plug spring (59) that abuts against the middle rod (34) to force the plug (58) to be tightly inserted into the guide rod (56), the middle rod (34) is fixedly connected to a rack (41), and a knob (42) is rotatably connected to the outer wall of the box (1). 42) A middle gear (43) is coaxially fixedly connected to the block rack (41); a push rod (45) that can abut against the end of the guide rod (56) is slidably connected inside the housing (1); a rod spring (46) that forces the push rod (45) to move toward the tube plate (55) is provided inside the housing (1); a block groove (47) that extends through to one hemispherical end of the guide rod (56) is provided on the outer wall of the guide rod (56); the block groove (47) allows the end of the insert block (58) to slide so that the push rod (45) can abut against the insert block (58).

2. The detection device for defective welding of spring tubes according to claim 1, characterized in that: The detection component (3) includes a photoelectric switch, the signal component (5) includes a signal lamp, the housing (1) is provided with a lamp plate (51) for the signal component (5), the lamp plate (51) is hinged to a detection plate (52) for the detection component (3), the detection plate (52) is located directly above the gas injection section (2), and the hinge point of the detection plate (52) is located at the upper part of the detection plate (52).

3. The detection device for defective welding of spring tubes according to claim 1, characterized in that: The end of the guide rod (56) is hemispherical, and the side of the insert (58) facing the tube plate (55) is formed with a push-in surface (44). The hemispherical end of the guide rod (56) can abut against the push-in surface (44) to allow the insert (58) to move.

4. The detection device for defective welding of spring tubes according to claim 2, characterized in that: The detection plate (52) is provided with an upper ring (48) and the lamp plate (51) is provided with a lower ring (31). A tension spring (49) is detachably connected between the upper ring (48) and the lower ring (31) to force the upper ring (48) and the lower ring (31) to approach each other. The height of the lower ring (31) is lower than the height of the rotation point of the detection plate (52).

5. The detection device for defective welding of spring tubes according to claim 4, characterized in that: The lamp panel (51) is fixedly connected to a flat plate (32) that can abut against the detection plate (52) facing the box (1).

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