Workpiece air tightness detection device

Abstract

The utility model relates to the technical field of air tightness detection, in particular to a workpiece air tightness detection device which comprises a base plate, a sealing mechanism is mounted at the upper end of the base plate, an outer cover is mounted at the upper end of the base plate, a pushing and pressing mechanism is mounted at the top of an inner cavity of the outer cover, and the inner cavity of the outer cover is connected with a fixing plate. A control switch is installed on the outer side of the fixing plate, the sealing mechanism comprises a bottom plate arranged at the upper end of the base plate, the bottom plate is in threaded connection with the base plate through a plurality of sets of bolts, and a rubber base is connected to the middle of the upper end of the base plate. According to the utility model, the position of the uncovered box body is effectively limited and fixed during air tightness detection, so that the influence on the final air tightness detection result caused by displacement during detection is avoided, the effect of sealing and protecting the uncovered box body is effectively improved, the accurate effect of air tightness detection of a product seat is conveniently improved, and the production efficiency is improved. Therefore, the work efficiency of air tightness detection is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to a workpiece airtightness testing device. Background Technology

[0002] After production, the workpiece (rectangular open box) needs to undergo various quality inspections to ensure that it meets quality requirements. Among them, airtightness testing is an important indicator. By conducting airtightness testing on the workpiece, it is possible to meet the stringent IP protection level requirements.

[0003] Currently, when conducting airtightness testing on workpieces (rectangular uncovered boxes) in the production workshop, a pressing device is used to press the uncovered part of the workpiece (rectangular uncovered box) tightly onto a support base. Then, compressed gas is delivered to the inner cavity of the workpiece (rectangular uncovered box), thus pressing the upper end of the workpiece, supporting the lower end, and inflating the interior. If the pressure remains constant for a period of time, it indicates that the airtightness meets the requirements. However, when there is no positioning seal between the workpiece (rectangular uncovered box) and the support base, the workpiece (rectangular uncovered box) is prone to displacement at the pressing position, which can lead to a failure to guarantee airtightness. This reduces the efficiency of workpiece airtightness testing. Therefore, we provide a workpiece airtightness testing device to solve this problem. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a workpiece airtightness testing device.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a workpiece airtightness testing device, including a base plate, a sealing mechanism installed on the upper end of the base plate, an outer cover installed on the upper end of the base plate, a pushing mechanism installed on the top of the inner cavity of the outer cover, a fixing plate connected to the inner cavity of the outer cover, and a control switch installed on the outer side of the fixing plate.

[0006] The sealing mechanism includes a base plate disposed on the upper end of the substrate. The base plate is screwed to the substrate by multiple sets of bolts. A rubber seat is connected to the middle of the upper end of the substrate. An air inlet is provided in the middle of the rubber seat. A connecting pipe is installed at the lower end of the air inlet. An airtightness detection component is attached to the lower end of the connecting pipe. A sealing component is integrally connected to the upper end of the base plate. An open box body is inserted into the inner cavity of the sealing component.

[0007] In a further preferred embodiment, the sealing assembly includes an inner frame strip and an outer frame strip integrally mounted on the upper end of a base plate. A bottom pad is bonded to the upper end of the base plate between the inner frame strip and the outer frame strip. An inner pad is bonded to the inner side of the outer frame strip. Inner grooves are equidistantly arranged on the outer and inner sides of the inner pad. The inner pad is a hollow pad. Both the inner pad and the bottom pad are made of rubber material. Hydraulic cylinders are symmetrically mounted on the upper end of the base plate. A piston rod is movably arranged in the inner cavity of the hydraulic cylinder. A top block is connected to the upper end of the piston rod. An oil drain pipe is connected to the outer side of the hydraulic cylinder. One section of the oil drain pipe passes through the outer frame strip and is connected to the inner pad.

[0008] In a further preferred embodiment, the upper end of the top block is provided with a slot, and the lower end of the top block is connected to a first spring, the lower end of the first spring being in contact with the upper end of the oil cylinder.

[0009] In a further preferred embodiment, the lower end of the substrate is connected to a housing, and two sets of doors are movably installed on the outside of the housing.

[0010] In a further preferred embodiment, the airtightness detection component includes an air pump installed at the bottom of the inner cavity of the housing, an air pipe connected to the outside of the air pump, one end of the air pipe connected to a connecting pipe, a solenoid valve installed on the outside of the air pipe, and a pressure detector installed on the outside of the fixing plate. The pressure detector passes through the air pipe and extends into the inner cavity of the air chamber via a detection probe.

[0011] In a further preferred embodiment, the pushing mechanism includes a hydraulic cylinder mounted on the upper center of the outer cover. The output end of the hydraulic cylinder is connected to a push plate. Fixed columns are movably inserted around the upper end of the push plate. The lower ends of every two sets of fixed columns pass through the push plate and are connected to a pressure plate. A rubber pad is adhered to the lower end of each pressure plate. Two sets of second springs are installed between the push plate and each pressure plate.

[0012] In a further preferred embodiment, both sides of the push plate are connected to fixing blocks, and a positioning post is installed in the middle of the fixing block. The upper end of the positioning post penetrates through the outer cover and extends above it, and the lower end of the positioning post corresponds to the position of the slot.

[0013] The advantages and beneficial effects of this utility model are as follows: 1. By placing the lower end of the uncovered box body on the inner frame strip and the outer frame strip, and the lower end of the uncovered box body is in contact with the bottom pad, and the lower outer side of the uncovered box body is in contact with the inner side of the inner pad, it is convenient to effectively limit and fix the position of the uncovered box body during the airtightness test, so as to avoid displacement during the test, thereby affecting the final airtightness test result and reducing work efficiency.

[0014] 2. When the pusher mechanism presses down on the uncovered box body, the pressure plate of the pusher mechanism presses down on the uncovered box body, making its lower end fit more tightly with the bottom pad, increasing the sealing and protection effect of the lower end of the uncovered box body. At the same time, the pusher plate presses down and drives the fixing block to move down. The lower end of the positioning column in the middle of the fixing block is inserted into the slot at the upper end of the top block. Then the top block is pressed down, so that the top block compresses the first spring downward and presses down the piston rod. The piston rod pushes the hydraulic oil in the inner cavity of the oil cylinder, which exceeds the volume of the inner pad, into the inner cavity of the inner pad. This makes the inner cavity of the inner pad in a super-full state, which causes the inner pad to expand outward. This makes the multiple cut surfaces on the inner side of the inner pad fit tightly with the lower outer side of the uncovered box body, thereby increasing the sealing and protection effect of the uncovered box body and improving the accuracy of its product seat airtightness testing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure proposed in this utility model;

[0016] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the box door proposed in this utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the sealing mechanism and airtightness detection component proposed in this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the sealing mechanism proposed in this utility model;

[0019] Figure 5 The present utility model proposes Figure 4 A magnified schematic diagram of the device in section A;

[0020] Figure 6 This is a three-dimensional structural diagram of the pushing mechanism proposed in this utility model.

[0021] In the diagram: 1. Base plate; 2. Sealing mechanism; 21. Base plate; 22. Bolt; 23. Rubber seat; 25. Air inlet; 26. Connecting pipe; 27. Inner frame strip; 28. Outer frame strip; 29. ​​Bottom pad; 210. Inner pad; 211. Inner groove; 212. Oil cylinder; 213. Piston rod; 214. Top block; 215. Slot; 216. Oil drain pipe; 217. First spring; 3. Coverless box body; 4. Outer cover; 5. Pushing mechanism; 51. Hydraulic cylinder; 52. Push plate; 53. Fixing column; 54. Pressure plate; 55. Rubber pad; 56. Second spring; 57. Fixing block; 58. Positioning column; 6. Box body; 7. Box door; 8. Fixing plate; 9. Control switch; 10. Air pump; 11. Air pipe; 12. Pressure detector; 13. Solenoid valve. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] Reference Figure 1-2 As shown in Figure 6, a workpiece airtightness testing device includes a base plate 1. An outer cover 4 is installed on the upper end of the base plate 1. A fixing plate 8 is connected to the inner cavity of the outer cover 4. A control switch 9 is installed on the outer side of the fixing plate 8. A pushing mechanism 5 is installed on the top of the inner cavity of the outer cover 4. The pushing mechanism 5 includes a hydraulic cylinder 51 installed in the middle of the upper end of the outer cover 4. A push plate 52 is connected to the output end of the hydraulic cylinder 51. Fixing posts 53 are movably inserted around the upper end of the push plate 52. The lower ends of every two sets of fixing posts 53 pass through the push plate 52 and are connected to a pressure plate 54. A rubber pad 55 is glued to the lower end of each pressure plate 54. Two sets of second springs 56 are installed between the push plate 52 and each pressure plate 54. Fixing blocks 57 are connected to both sides of the push plate 52. A positioning post 58 is installed in the middle of the fixing block 57. The upper end of the positioning post 58 passes through the outer cover 4 and extends above it. The lower end of the positioning post 58 corresponds to the position of the slot 215.

[0024] The hydraulic cylinder 51 is activated by the control switch 9. The output end of the hydraulic cylinder 51 drives the push plate 52, the fixed column 53, the pressure plate 54, and the fixed block 57 to move downward. The pressure plate 54 presses down on the uncovered box body 3, making the uncovered box body 3 fit tightly with the sealing components, increasing the airtightness. When the push plate 52 presses down, the rubber pad 55 at the lower end of the pressure plate 54 and the second spring 56 between the push plate 52 and the pressure plate 54 can buffer and protect the uncovered box body 3 when it is pressed down, avoiding direct impact and squeezing of the uncovered box body 3, which would cause damage to its surface and affect the overall product quality. At the same time, the pressing down of the push plate 52 drives the fixed block 57 to move downward. The upper part of the positioning column 58 in the middle of the fixed block 57 moves downward on the top of the outer cover 4, which increases the stability of the downward movement of the fixed block 57 and the entire pressing mechanism 5.

[0025] Reference Figure 1-5 As shown, a sealing mechanism 2 is installed on the upper end of the substrate 1. The sealing mechanism 2 includes a base plate 21 disposed on the upper end of the substrate 1. The base plate 21 is screwed to the substrate 1 by multiple sets of bolts 22. A sealing assembly is integrally connected to the upper end of the base plate 21. An open box body 3 is inserted into the inner cavity of the sealing assembly.

[0026] The sealing assembly includes an inner frame strip 27 and an outer frame strip 28 integrally mounted on the upper end of the base plate 21. A bottom gasket 29 is bonded to the upper end of the base plate 21 between the inner frame strip 27 and the outer frame strip 28. An inner gasket 210 is bonded to the inner side of the outer frame strip 28. Inner grooves 211 are equidistantly arranged on the outer and inner sides of the inner gasket 210. The inner gasket 210 is a hollow gasket. Both the inner gasket 210 and the bottom gasket 29 are made of rubber material. Hydraulic cylinders 21 are symmetrically mounted on the upper end of the base plate 1. 2. A piston rod 213 is movably arranged in the inner cavity of the oil cylinder 212. A top block 214 is connected to the upper end of the piston rod 213. An oil drain pipe 216 is connected to the outer side of the oil cylinder 212. One section of the oil drain pipe 216 passes through the outer frame strip 28 and is connected to the inner gasket 210. A slot 215 is provided at the upper end of the top block 214. A first spring 217 is connected to the lower end of the top block 214. The lower end of the first spring 217 is in contact with the upper end of the oil cylinder 212.

[0027] By placing the lower end of the uncovered box body 3 on the inner frame strip 27 and the outer frame strip 28, with the lower end of the uncovered box body 3 in contact with the bottom pad 29 and the lower outer side of the uncovered box body 3 in contact with the inner side of the inner pad 210, the pushing mechanism 5 moves down to press the uncovered box body 3, making the lower end of the uncovered box body 3 in close contact with the bottom pad 29. When the pushing mechanism 5 moves down, the lower end of the positioning post 58 in the middle of the fixing block 57 is inserted into the slot 215 at the upper end of the top block 214, and then the top block 214 is pressed down, thereby the top block 214 compresses the first spring 217 downward. Simultaneously, the piston rod 213 is pressed down, and the piston rod 213 pushes the hydraulic oil in the inner cavity of the cylinder 212 into the inner cavity of the inner pad 210. The volume of the hydraulic oil pushed in is greater than the volume of the inner cavity of the inner pad 210, making the inner cavity of the inner pad 210 in a super-full state. This causes the inner pad 210 to expand outward. Furthermore, due to the multiple sets of inner grooves 211 provided on the inner side of the inner pad 210, the inner side of the inner pad 210 is divided into multiple surface areas, and each surface area is in contact with the lower outer side of the uncovered box body 3, thereby increasing the sealing and protection effect of the uncovered box body 3.

[0028] Reference Figure 2-3 As shown, a rubber seat 23 is connected to the upper middle part of the substrate 1. An air inlet 25 is provided in the middle of the rubber seat 23. A connecting pipe 26 is installed at the lower end of the air inlet 25. An airtightness detection component is installed at the lower end of the connecting pipe 26. A housing 6 is connected to the lower end of the substrate 1. Two sets of doors 7 are movably installed on the outside of the housing 6. The airtightness detection component includes an air pump 10 installed at the bottom of the inner cavity of the housing 6. An air pipe 11 is connected to the outside of the air pump 10. One end of the air pipe 11 is connected to the connecting pipe 26. A solenoid valve 13 is installed on the outside of the air pipe 11. A pressure detector 12 is installed on the outside of the fixing plate 8. The pressure detector 12 passes through the air pipe 11 and extends into the inner cavity of the air chamber through a detection probe.

[0029] By turning on the air pump 10, a certain amount of compressed gas is delivered from the connecting pipe 26 to the air inlet 25 through the air pipe 11, and then delivered from the outlet of the air inlet 25 to the inner cavity of the uncovered box body 3. Then, by turning on the solenoid valve 13, air pressure is prevented from entering the inner cavity of the uncovered box body 3 through the air pipe 11 or being discharged from its inner cavity. Then, the probe of the pressure detector 12 detects the gas pressure at the section between the air pipe 11 above the solenoid valve 13 and the inner cavity of the uncovered box body 3. If the pressure remains unchanged for a period of time, it indicates that the airtightness meets the requirements, and the product is qualified. This facilitates effective automated testing of the airtightness of the uncovered box body 3.

[0030] Working Principle: This utility model uses a control switch 9 to connect with the hydraulic cylinder 51, air pump 10, pressure detector 12, and solenoid valve 13 via PLC programming control. The technology used is existing PLC circuit control connection technology, which will not be elaborated upon here. During operation, the lower end of the uncovered box body 3 is placed on the inner frame strip 27 and outer frame strip 28, with the lower end of the uncovered box body 3 abutting against the bottom pad 29, and the lower outer side of the uncovered box body 3 abutting against the inner side of the inner pad 210. Then, the control switch 9 is used to activate the hydraulic cylinder 51, and the hydraulic... The output end of cylinder 51 drives the push plate 52, the fixing post 53, the pressure plate 54, and the fixing block 57 to move downwards. The pressure plate 54 presses down on the uncovered box body 3, making the uncovered box body 3 fit more tightly with the bottom pad 29, increasing the sealing and protection effect on the lower end of the uncovered box body 3. At the same time, the push plate 52 presses down, causing the fixing block 57 to move downwards. The lower end of the positioning post 58 in the middle of the fixing block 57 is inserted into the slot 215 at the upper end of the top block 214. Then, the top block 214 is pressed down, thereby compressing the first spring 217 downwards while pressing down the piston rod 213. The piston rod 213 pushes the hydraulic oil in the inner cavity of the cylinder 212 into the inner cavity of the inner gasket 210. The volume of the hydraulic oil pushed in is greater than the volume of the inner cavity of the inner gasket 210, causing the inner cavity of the inner gasket 210 to be in a super-full state. This causes the inner gasket 210 to expand outward. Furthermore, due to the multiple sets of inner grooves 211 provided on the inner side of the inner gasket 210, the inner side of the inner gasket 210 is divided into multiple surface areas, and each surface area is in contact with the lower outer side of the uncovered box body 3, thereby increasing the sealing and protection effect of the uncovered box body 3. Subsequently, the air pump 10 delivers a certain amount of... Compressed gas is delivered to the inner cavity of the uncovered box body 3 through the air pipe 11, connecting pipe 26 and air inlet 25. Then, by opening the solenoid valve 13, the gas pressure is prevented from entering the inner cavity of the uncovered box body 3 through the air pipe 11 or from being discharged from its inner cavity. Then, the gas pressure at the section between the air pipe 11 and the inner cavity of the uncovered box body 3 above the solenoid valve 13 is detected by the probe of the pressure detector 12. If the pressure remains unchanged for a period of time, it indicates that the air tightness meets the requirements, and the product is qualified. This facilitates the effective automated detection of the air tightness of the uncovered box body 3.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A workpiece airtightness testing device, comprising a substrate, characterized in that, A sealing mechanism is installed at the upper end of the substrate, an outer cover is installed at the upper end of the substrate, a pushing mechanism is installed at the top of the inner cavity of the outer cover, a fixing plate is connected to the inner cavity of the outer cover, and a control switch is installed on the outer side of the fixing plate. The sealing mechanism includes a base plate disposed on the upper end of the substrate. The base plate is screwed to the substrate by multiple sets of bolts. A rubber seat is connected to the middle of the upper end of the substrate. An air inlet is provided in the middle of the rubber seat. A connecting pipe is installed at the lower end of the air inlet. An airtightness detection component is attached to the lower end of the connecting pipe. A sealing component is integrally connected to the upper end of the base plate. An open box body is inserted into the inner cavity of the sealing component.

2. The workpiece airtightness testing device according to claim 1, characterized in that, The sealing assembly includes an inner frame strip and an outer frame strip integrally mounted on the upper end of the base plate. A bottom gasket is bonded to the upper end of the base plate between the inner frame strip and the outer frame strip. An inner gasket is bonded to the inner side of the outer frame strip. Inner grooves are equidistantly arranged on the outer and inner sides of the inner gasket. The inner gasket is a hollow gasket. Both the inner gasket and the bottom gasket are made of rubber material. Hydraulic cylinders are symmetrically mounted on the upper end of the base plate. A piston rod is movably arranged in the inner cavity of the hydraulic cylinder. A top block is connected to the upper end of the piston rod. An oil drain pipe is connected to the outer side of the hydraulic cylinder. One section of the oil drain pipe passes through the outer frame strip and is connected to the inner gasket.

3. The workpiece airtightness testing device according to claim 2, characterized in that, The upper end of the top block is provided with a slot, and the lower end of the top block is connected to a first spring, the lower end of the first spring being in contact with the upper end of the oil cylinder.

4. The workpiece airtightness testing device according to claim 1, characterized in that, The lower end of the base plate is connected to a housing, and two sets of doors are movably installed on the outside of the housing.

5. The workpiece airtightness testing device according to claim 4, characterized in that, The airtightness detection component includes an air pump installed at the bottom of the inner cavity of the box, an air pipe connected to the outside of the air pump, one end of the air pipe connected to a connecting pipe, a solenoid valve installed on the outside of the air pipe, and a pressure detector installed on the outside of the fixing plate. The pressure detector passes through the air pipe and extends into the inner cavity of the air chamber through a detection probe.

6. The workpiece airtightness testing device according to claim 3, characterized in that, The pushing mechanism includes a hydraulic cylinder installed in the middle of the upper part of the outer cover. The output end of the hydraulic cylinder is connected to a push plate. Fixed columns are movably inserted around the upper end of the push plate. The lower ends of every two sets of fixed columns pass through the push plate and are connected to a pressure plate. Rubber pads are glued to the lower ends of the pressure plates. Two sets of second springs are installed between the push plate and each pressure plate.

7. The workpiece airtightness testing device according to claim 6, characterized in that, Both sides of the push plate are connected to fixing blocks, and a positioning post is installed in the middle of the fixing block. The upper end of the positioning post penetrates the outer cover and extends above it, and the lower end of the positioning post corresponds to the position of the slot.

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