A detection jig for precision workpieces

Abstract

This utility model discloses a precision workpiece inspection fixture, relating to the field of inspection fixture technology. The device connects an air source pipe to a three-way quick connector and adds water inside the enclosure. The workpiece is placed within a limiting block, with its bottom contacting the through hole. A second cylinder drives a pressure plate to slide along a sliding rod, effectively sealing the top of the workpiece with a first rubber pad on the pressure plate. Pressure is then applied to the workpiece, and the first cylinder is activated to immerse a U-shaped plate in water. This allows for direct observation of whether bubbles form on the workpiece due to air leakage, enabling rapid and accurate detection of the airtightness of the precision workpiece's connection. The fixture's nozzle design ensures smooth pressurization, effectively preventing the second rubber pad from deforming and blocking the second air passage under pressure. Furthermore, the protrusions not only enhance the thickness of the connection between the second rubber pad and the workpiece but also significantly improve sealing performance and service life, making it suitable for the airtightness testing needs of precision workpieces.

Description

Technical Field

[0001] This utility model belongs to the field of testing fixture technology, and specifically relates to a testing fixture for precision workpieces. Background Technology

[0002] In the field of precision workpiece production and manufacturing, especially workpieces involving fluid transmission or sealed containers, the airtightness of their joints is one of the key indicators for measuring product quality. The airtightness testing method usually adopts water immersion leak detection.

[0003] Traditional inspection fixtures typically have round holes directly drilled in the rubber pad to allow airflow. When clamped, displacement or deformation of the rubber pad can easily block the pressurized air path, resulting in unreliable inspection results and low efficiency. To solve the above problems, we provide an inspection fixture for precision workpieces. Utility Model Content

[0004] The purpose of this invention is to provide a precision workpiece inspection fixture to solve the problems mentioned in the background art. Traditional inspection fixtures usually have round holes directly opened in the rubber pad to allow airflow. When clamping, the displacement or deformation of the rubber pad can easily block the pressurized air path, resulting in unreliable inspection results and low efficiency.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a precision workpiece inspection fixture includes a base plate, a vertical plate fixedly connected to the top of the base plate, a first cylinder fixedly connected to the front of the vertical plate, a U-shaped plate fixedly connected to the telescopic end of the first cylinder, two sliding rods fixedly connected to the inner side of the U-shaped plate, a pressure plate provided on the front of the U-shaped plate, the interior of the pressure plate being slidably connected to the sliding rods, a second cylinder fixedly connected to the top of the U-shaped plate, the telescopic end of the second cylinder being fixedly connected to the pressure plate, and a surrounding plate fixedly connected to the front of the vertical plate. The bottom of the enclosure is fixedly connected to the base plate. A first rubber pad is fixedly connected to the bottom of the pressure plate. A detection plate is fixedly connected to the inner side of the U-shaped plate. Two first air passages are opened on the front of the detection plate. A second air passage communicating with the first air passages is opened on the top of the detection plate. A second rubber pad is fixedly connected to the top of the detection plate. Protrusions are integrally machined on both sides of the bottom of the second rubber pad. A groove matching the protrusions is opened on the top of the detection plate. An air nozzle is threadedly connected to the inside of the second air passage. A through hole matching the air nozzle is opened inside the second rubber pad.

[0006] Preferably, the front of the U-shaped plate is provided with two limiting blocks, and the inside of the limiting blocks is fitted with mounting bolts, one end of which is threadedly connected to the U-shaped plate.

[0007] Preferably, the first air passage is internally threaded with an L-shaped quick connector, one end of which is connected to an air tube, and the front of the detection plate is provided with a three-way quick connector, the other end of which is connected to the three-way quick connector.

[0008] Preferably, the base plate has an L-shaped drainage hole inside, and a control valve is threaded to one end of the L-shaped drainage hole.

[0009] Preferably, guide rails are fixedly connected to both sides of the front of the upright plate, and sliders are slidably connected to the surface of the guide rails. The back of the U-shaped plate is fixedly connected to the sliders.

[0010] Preferably, reinforcing blocks are fixedly connected to both sides of the back of the upright plate, the bottom of the reinforcing blocks are fixedly connected to the base plate, a handle is fixedly connected to the top of the upright plate, and a base is fixedly connected to both sides of the bottom of the base plate.

[0011] This utility model has the following beneficial effects: This device connects an air supply pipe to a three-way quick connector and adds water inside the enclosure. The workpiece is placed within a limiting block, ensuring its bottom contacts the through-hole. A second cylinder drives a pressure plate to slide along a sliding rod, effectively sealing the top of the workpiece with the first rubber pad on the pressure plate. The air supply is then turned on, pressurizing the workpiece through the first and second air passages and the air nozzle. The first cylinder is then activated, immersing the U-shaped plate in water. This allows for direct observation of whether bubbles form on the workpiece due to air leakage, enabling rapid and accurate testing of the airtightness of precision workpiece joints. The fixture's nozzle design ensures smooth pressurization, effectively preventing the second rubber pad from deforming and blocking the second air passage under pressure. Furthermore, the use of grooves and protrusions in the installation not only enhances the thickness of the second rubber pad at the workpiece joint but also significantly improves sealing performance and service life, making it suitable for airtightness testing of precision workpieces. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a partial three-dimensional structural view of the present invention; Figure 3 This is a partial three-dimensional structural view of the present invention; Figure 4 This is an exploded cross-sectional view of a portion of the structure of this utility model; Figure 5 This is a partial three-dimensional structural view of this utility model.

[0013] Reference numerals: 1. Base plate; 2. Vertical plate; 3. First cylinder; 4. U-shaped plate; 5. Slide rod; 6. Pressure plate; 7. Second cylinder; 8. Enclosure plate; 9. First rubber pad; 10. Detection plate; 11. First air passage; 12. Second air passage; 13. Groove; 14. Second rubber pad; 15. Protrusion; 16. Air nozzle; 17. Limiting block; 18. Mounting bolt; 19. L-shaped quick connector; 20. Air pipe; 21. T-shaped quick connector; 22. L-shaped drain hole; 23. Control valve; 24. Guide rail; 25. Slider; 26. Reinforcing block; 27. Handle; 28. Base. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Example 1: refer to Figure 1-5 A precision workpiece inspection fixture includes a base plate 1, a vertical plate 2 fixedly connected to the top of the base plate 1, a first cylinder 3 fixedly connected to the front of the vertical plate 2, a U-shaped plate 4 fixedly connected to the telescopic end of the first cylinder 3, two sliding rods 5 fixedly connected to the inner side of the U-shaped plate 4, a pressure plate 6 provided on the front of the U-shaped plate 4, the interior of the pressure plate 6 being slidably connected to the sliding rods 5, a second cylinder 7 fixedly connected to the top of the U-shaped plate 4, the telescopic end of the second cylinder 7 being fixedly connected to the pressure plate 6, a surrounding plate 8 fixedly connected to the front of the vertical plate 2, the bottom of the surrounding plate 8 being fixedly connected to the base plate 1, and the bottom of the pressure plate 6 being fixedly connected to the base plate 1. A first rubber pad 9 is fixedly connected to the inner side of the U-shaped plate 4. A detection plate 10 is fixedly connected to the inner side of the U-shaped plate 4. Two first air passages 11 are opened on the front side of the detection plate 10. A second air passage 12 communicating with the first air passages 11 is opened on the top of the detection plate 10. A second rubber pad 14 is fixedly connected to the top of the detection plate 10. Both sides of the bottom of the second rubber pad 14 are integrally machined with protrusions 15. A groove 13 matching the protrusions 15 is opened on the top of the detection plate 10. An air nozzle 16 is threadedly connected to the inside of the second air passage 12. A through hole matching the air nozzle 16 is opened inside the second rubber pad 14.

[0016] Specifically, the device connects the air source pipe to the three-way quick connector 21 and adds water inside the enclosure 8. The workpiece is placed inside the limiting block 17 so that its bottom contacts the through hole. The second cylinder 7 drives the pressure plate 6 to slide along the slide rod 5, so that the first rubber pad 9 on the pressure plate 6 effectively seals the top of the workpiece. Then, the air source is turned on to pressurize the inside of the workpiece through the first air passage 11, the second air passage 12 and the air nozzle 16. Then, the first cylinder 3 is started to drive the U-shaped plate 4 to be immersed in water. It is possible to visually observe whether the workpiece has water bubbles due to air leakage, thereby realizing the rapid and accurate detection of the airtightness of the connection of precision workpieces. The fixture ensures that the pressurization process is smooth through the structural design of the air nozzle 16, effectively preventing the second rubber pad 14 from deforming and blocking the second air passage 12 when under pressure. At the same time, the installation method of the groove 13 and the protrusion 15 not only enhances the thickness of the connection between the second rubber pad 14 and the workpiece, but also significantly improves the sealing performance and service life, which is suitable for the airtightness detection needs of precision workpieces.

[0017] refer to Figure 3 Two limiting blocks 17 are provided on the front of the U-shaped plate 4. An installation bolt 18 is sleeved inside the limiting block 17. One end of the installation bolt 18 is threaded to the U-shaped plate 4. By setting the limiting block 17, the workpiece can be placed quickly.

[0018] refer to Figure 4 The first air passage 11 has an internal threaded connection to an L-shaped quick connector 19. One end of the L-shaped quick connector 19 is connected to an air pipe 20. The front of the detection plate 10 is provided with a three-way quick connector 21. The other end of the air pipe 20 is connected to the three-way quick connector 21. The three-way quick connector 21 facilitates quick connection with the air source pipe.

[0019] refer to Figure 2 The bottom plate 1 has an L-shaped drain hole 22 inside. One end of the L-shaped drain hole 22 is threaded to a control valve 23. By setting the L-shaped drain hole 22, water can be discharged.

[0020] refer to Figure 2 Guide rails 24 are fixedly connected to both sides of the front of the upright plate 2. Slider 25 is slidably connected to the surface of the guide rails 24. The back of the U-shaped plate 4 is fixedly connected to the slider 25. By setting the slider 25 and the guide rails 24, the U-shaped plate 4 can move stably.

[0021] refer to Figure 2 The upright plate 2 has a reinforcing block 26 fixedly connected to both sides of its back side. The bottom of the reinforcing block 26 is fixedly connected to the base plate 1. The top of the upright plate 2 has a handle 27 fixedly connected to it. The bottom of the base plate 1 has a base 28 fixedly connected to both sides of its bottom. By setting the reinforcing block 26, the stability of the upright plate 2 can be effectively improved.

[0022] Brief description of usage: The user connects the air source pipe to the three-way quick connector 21, adds water inside the enclosure 8, and then places the workpiece inside the limiting block 17, with the bottom of the workpiece in contact with the through hole. The second cylinder 7 is activated to drive the pressure plate 6 to slide on the surface of the slide rod 5. At the same time, the pressure plate 6 drives the first rubber pad 9 to seal the top of the workpiece. The air source is opened to pressurize the inside of the workpiece through the first air passage 11, the second air passage 12, and the air nozzle 16. The first cylinder 3 is then activated to drive the U-shaped plate 4 into the water. It is possible to observe whether the workpiece leaks air or emits water bubbles, thus facilitating a quick test of the airtightness of the precision workpiece connection. By setting the air nozzle 16, the workpiece can be pressurized smoothly, preventing the second rubber pad 14 from being squeezed and deformed and blocking the second air passage 12. The groove 13 is used in conjunction with the protrusion 15 for installation. The protrusion 15 increases the thickness of the connection between the second rubber pad 14 and the workpiece, and also improves the sealing performance and service life of the second rubber pad 14.

[0023] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A precision workpiece inspection fixture, comprising a base plate (1), characterized in that: A vertical plate (2) is fixedly connected to the top of the base plate (1). A first cylinder (3) is fixedly connected to the front of the vertical plate (2). A U-shaped plate (4) is fixedly connected to the telescopic end of the first cylinder (3). Two sliding rods (5) are fixedly connected to the inner side of the U-shaped plate (4). A pressure plate (6) is provided on the front of the U-shaped plate (4). The inside of the pressure plate (6) is slidably connected to the sliding rods (5). A second cylinder (7) is fixedly connected to the top of the U-shaped plate (4). The telescopic end of the second cylinder (7) is fixedly connected to the pressure plate (6). A surrounding plate (8) is fixedly connected to the front of the vertical plate (2). The bottom of the surrounding plate (8) is fixedly connected to the base plate (1). A pressure plate (6) is fixedly connected to the bottom of the pressure plate (6). The first rubber pad (9) is fixedly connected to the inner side of the U-shaped plate (4). The front of the detection plate (10) has two first air passages (11). The top of the detection plate (10) has a second air passage (12) that communicates with the first air passages (11). The top of the detection plate (10) is fixedly connected to the second rubber pad (14). The bottom sides of the second rubber pad (14) are integrally machined with protrusions (15). The top of the detection plate (10) has a groove (13) that matches the protrusions (15). The inside of the second air passage (12) is threaded with an air nozzle (16). The inside of the second rubber pad (14) has a through hole that matches the air nozzle (16).

2. The precision workpiece inspection fixture according to claim 1, characterized in that: Two limiting blocks (17) are provided on the front of the U-shaped plate (4). An installation bolt (18) is sleeved inside the limiting block (17), and one end of the installation bolt (18) is threadedly connected to the U-shaped plate (4).

3. The precision workpiece inspection fixture according to claim 1, characterized in that: The first air passage (11) is internally threaded with an L-shaped quick connector (19), one end of which is connected to an air tube (20). The front of the detection plate (10) is provided with a three-way quick connector (21), and the other end of the air tube (20) is connected to the three-way quick connector (21).

4. The precision workpiece inspection fixture according to claim 1, characterized in that: The base plate (1) has an L-shaped drainage hole (22) inside, and a control valve (23) is threaded to one end of the L-shaped drainage hole (22).

5. A precision workpiece inspection fixture according to claim 1, characterized in that: The front sides of the upright plate (2) are fixedly connected to guide rails (24), and the surface of the guide rails (24) is slidably connected to sliders (25). The back of the U-shaped plate (4) is fixedly connected to the sliders (25).

6. A precision workpiece inspection fixture according to claim 1, characterized in that: The two sides of the back of the upright plate (2) are fixedly connected to the reinforcing blocks (26), the bottom of the reinforcing blocks (26) is fixedly connected to the bottom plate (1), the top of the upright plate (2) is fixedly connected to the handle (27), and the two sides of the bottom of the bottom plate (1) are fixedly connected to the base (28).

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