An airtightness testing device for a high thermal conductivity modified PPS tube

Abstract

This invention relates to the field of airtightness testing technology, and particularly to an airtightness testing device for high thermal conductivity modified PPS pipes, comprising a worktable, a moving plate, a limiting plate, and a moving assembly. The airtightness testing device for high thermal conductivity modified PPS pipes designed in this invention uses an external drive motor to rotate gears, causing a sawtooth rack to move two limiting plates in each group of plates synchronously towards each other, facilitating the limiting of the pipe sample. An electric push rod allows for easy adjustment of the height of the moving assembly, ensuring sufficient space between the end of the pipe sample and the worktable. The moving plate drives the moving assembly to move synchronously, adjusting the distance between the two moving assemblies. The cooperation of a fixed plate, a T-shaped rod, a wedge block, a compression spring, and a roller cavity facilitates the adjustment of the inclination angle of the tapered pipe, allowing the moving assembly to align with both ends of pipe samples of different lengths and shapes. Airtightness testing is performed by inflating the pipe sample from both ends.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, and in particular to an airtightness testing device for a high thermal conductivity modified PPS tube. Background Technology

[0002] High thermal conductivity modified PPS pipes are characterized by their light weight, strong chemical corrosion resistance, excellent electrical insulation, high impact resistance, and simple processing and molding, as well as their high thermal conductivity. Before use, existing high thermal conductivity modified PPS pipes need to undergo airtightness testing to ensure they are free of cracks and prevent substandard pipes from entering the market. A direct pressure testing method is typically used, which involves directly filling the pipe sample with gas, then cutting off the gas supply and observing the pressure change. If the pressure drops, it indicates a leak. However, existing high thermal conductivity modified PPS pipes still have the following problems during airtightness testing:

[0003] 1. Pipes of the same diameter may have different shapes. Some pipes may have bends at one or both ends. When testing the airtightness of a pipe, the testing device used may not be able to adapt to the shape of the pipe end and may not be able to ensure accurate connection with the two ends of the pipe.

[0004] 2. Both ends of the pipe sample are simultaneously connected to independent testing devices, and the distance between the testing devices is fixed. This makes it unsuitable for testing the airtightness of pipe samples with large variations in length and dimensions, resulting in a narrow range of applicability for the testing devices. Summary of the Invention

[0005] To solve the above problems, the present invention adopts the following technical solution: an airtightness testing device for high thermal conductivity modified PPS pipe, comprising a worktable, a movable plate, a limiting plate, and a movable component. A controller is provided at the rear end of the worktable. Two through movable slots are opened in the middle of the upper surface of the worktable. Sawtooth strips are provided in each movable slot. Gears mesh between the two sawtooth strips. Three sets of plates for clamping pipes are equidistantly arranged from front to back on the upper end of the worktable. Each set of plates includes two limiting plates. The two limiting plates in each set are respectively installed on the upper end of the corresponding sawtooth strips. Multiple sliding grooves penetrating the two movable slots are opened on the upper surface of the worktable. Slider blocks are slidably connected to the left and right ends of the sliding grooves. Movable plates are installed on the upper surface of the sliders. Movable components are provided on the upper surface of the movable plates.

[0006] The moving component includes a moving block, a roller cavity, a square frame, and a fixing ring. The upper end face of the vertical section of the moving block is provided with a roller cavity. The front end face of the roller cavity is provided with an air inlet pipe. The end of the air inlet pipe away from the roller cavity is provided with a T-shaped pipe. The outside of the T-shaped pipe is fitted with a square frame. The annular surface of the roller cavity is provided with a tapered pipe. The side of the tapered pipe near the roller cavity is provided with an F-shaped pressing rod.

[0007] Preferably, the opposing surfaces of the two limiting plates in each group of plates are provided with multiple arc-shaped grooves distributed at equal intervals along the vertical direction, the serrations of the two saw teeth are arranged opposite each other, and the front end face of the upper end of the worktable is provided with a circular groove located between the moving grooves and communicating with all the moving grooves, and the gear is rotatably installed in the circular groove.

[0008] Preferably, the slide grooves are distributed at equal intervals along the front-back direction, and the number of slide grooves is the same as the number of plate groups. The slider is slidably connected in the slide groove. A square groove is opened on the upper end surface of the moving plate near the center line of the worktable, and an electric push rod is installed in the square groove.

[0009] Preferably, the movable block is installed at the telescopic end of the electric push rod. The vertical cross-section of the movable block in the left and right directions is L-shaped. A roller groove is provided on the upper end face of the vertical section of the movable block. A circular hole is provided at the central axis of the inner side wall of the roller groove. The roller cavity is rotatably connected in the roller groove. A shaft is provided at the rear end of the roller cavity. The shaft and the air inlet pipe are rotatably connected in the circular hole. Multiple slots are provided at equal intervals along the circumference of the annular surface of the roller cavity.

[0010] Preferably, a fixed block is provided at the middle of the upper end face of the horizontal section of the movable block, a T-shaped rod is rotatably inserted through the fixed block, a wedge block is fixed on the side of the T-shaped rod near the roller cavity, a compression spring is provided between the wedge block and the fixed block, the compression spring is sleeved on the T-shaped rod, and the wedge block is engaged with the corresponding slot.

[0011] Preferably, the outer diameter of the T-shaped tube near the air intake pipe is the same as the inner diameter of the air intake pipe. A threaded ring is fixed on the side of the frame near the air intake pipe. An annular threaded groove with the same center as the circular hole is opened on the side of the moving block near the frame. The threaded ring is threadedly connected in the annular threaded groove. A sealing ring is sleeved on the side of the T-shaped tube near the air intake pipe. The sealing ring is a rubber ring and is located on the side of the threaded ring near the air intake pipe. A hose is fixedly connected on the side of the T-shaped tube away from the air intake pipe.

[0012] Preferably, the tapered tube, T-shaped tube, and flexible tube are all connected to the interior of the roller cavity. Four hinge seats are fixed on the side of the tapered tube near the roller cavity, and F-shaped pressing rods are hinged to the hinge seats through torsion spring rods. A rubber sheet is provided on the side of the pressing rod near the tapered tube. A fixing ring is sleeved on the outer side of the large diameter end of the tapered tube, and the hinge seats are located inside the fixing ring.

[0013] Preferably, four arc-shaped limiting blocks are fixed on the inner wall of the side of the fixed ring away from the roller cavity. The limiting blocks are evenly distributed along the circumference of the fixed ring, and the distance between two adjacent limiting blocks is greater than the width of the pressing rod. The limiting blocks are engaged in the notches on the outer side of the corresponding pressing rods.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. The airtightness testing device for high thermal conductivity modified PPS pipe designed in this invention uses an external drive motor to drive gears to rotate, causing the sawtooth strip to drive two limiting plates in each group of plates to move synchronously towards each other, which facilitates the limiting of the pipe sample. The height of the moving component can be easily adjusted by an electric push rod, so that there is enough space between the end of the pipe sample and the worktable. The distance between the two moving components can be adjusted by the synchronous movement of the moving plate driving the moving component. The tilt angle of the tapered tube can be easily adjusted by the cooperation of the fixed plate, T-shaped rod, wedge block, compression spring and roller cavity, so that the moving component can be aligned with the two ends of pipe samples of different lengths and shapes. Airtightness testing can be performed by inflating the pipe sample from both ends.

[0016] 2. In this invention, the movement of the T-shaped rod facilitates the adjustment of the engagement state between the wedge block and the slot. When the T-shaped rod moves away from the roller cavity, the roller cavity can rotate. When the T-shaped rod is released, the wedge block engages with the slot under the cooperation of the compression spring, thereby fixing the roller cavity. Then, the inclination of the tapered tube on the annular surface of the roller cavity can be adjusted according to the curvature of the pipe sample port, so that the tapered tube is accurately aligned with the pipe sample port.

[0017] 3. In this invention, the cooperation of the fixing ring and the pressing rod improves the firmness and tightness of the connection between the pipe sample and the tapered tube, reducing the probability of errors in the air tightness test results of the pipe sample. By rotating the square frame, the square frame drives the T-shaped tube and the sealing ring to move synchronously towards the air inlet pipe. The sealing ring can simultaneously provide an external seal for the connection between the air inlet pipe and the roller cavity, and between the air inlet pipe and the T-shaped tube, to prevent air leakage, thereby further improving the accuracy of the air tightness test results of the pipe sample. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional diagram in this invention.

[0020] Figure 2 This is a diagram showing the operational status of the present invention.

[0021] Figure 3 This is a side view of the present invention.

[0022] Figure 4 yes Figure 3 AA-direction sectional plan view.

[0023] Figure 5 yes Figure 4 Enlarged view of point B.

[0024] Figure 6 This is a top view of the present invention.

[0025] Figure 7 This is a three-dimensional diagram of the movable plate and movable component in this invention.

[0026] Figure 8 This is an exploded 3D view of the movable plate and movable component in this invention.

[0027] Figure 9 This is an exploded 3D cross-sectional view of the movable block, the square frame, and the T-shaped tube in this invention.

[0028] Figure 10 This is a three-dimensional cross-sectional view of the roller cavity in this invention.

[0029] Figure 11 This is an exploded 3D view of the worktable and the limiting plate in this invention.

[0030] In the diagram: 1. Workbench; 11. Moving groove; 12. Circular groove; 13. Slide groove; 14. Controller; 2. Moving plate; 22. Electric push rod; 23. Slider; 3. Sawtooth rack; 31. Limiting plate; 32. Arc groove; 33. Gear; 4. Moving assembly; 41. Moving block; 411. Roller groove; 412. Circular hole; 413. Annular threaded groove; 42. Roller cavity; 421. Slot; 422. Shaft; 423. Air inlet pipe; 424. Conical tube; 43. Hinge seat; 431. Pressing rod; 432. Fixing ring; 433. Limiting block; 44. Fixing block; 441. T-shaped rod; 442. Wedge block; 443. Compression spring; 45. Square frame; 453. Threaded ring; 46. T-shaped tube; 462. Sealing ring. Detailed Implementation

[0031] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0032] See Figure 1 , Figure 2 and Figure 11 An airtightness testing device for a high thermal conductivity modified PPS pipe includes a workbench 1, a movable plate 2, a limiting plate 31, and a movable component 4. A controller 14 is provided at the rear end of the workbench 1. Two through movable grooves 11 are opened in the middle of the upper end face of the workbench 1. A serrated strip 3 is provided in each movable groove 11. Three sets of plates for clamping the pipe are equidistantly arranged from front to back at the upper end of the workbench 1. Each set of plates includes two limiting plates 31. The two limiting plates 31 in each set are respectively installed on the upper end of the corresponding serrated strip 3. The serrations of the two serrated strips 3 are arranged opposite each other. A gear 33 meshes between the two serrated strips 3. A circular groove 12 is opened on the front end face of the upper end of the workbench 1, which is located between the movable grooves 11 and communicates with all the movable grooves 11. The gear 33 is rotatably installed in the circular groove 12.

[0033] Gear 33 is connected to the output end of an external drive motor. The external drive motor drives gear 33 to rotate, and gear 33 drives the sawtooth strips 3 on both sides to move in opposite directions in the front and back direction, so that the limiting plate 31 moves synchronously with the sawtooth strips 3.

[0034] See Figure 3 and Figure 11 In each set of plates, the two limiting plates 31 have multiple arc-shaped grooves 32 that are evenly distributed in the vertical direction on their opposite surfaces.

[0035] The pipe sample to be tested for air tightness is placed between the two limiting plates 31 in each set of plates. Then, the gear 33 is rotated by the external drive motor, so that the sawtooth strips 3 move towards each other and the limiting plates 31 move synchronously. Finally, the limiting plates 31 clamp the pipe sample and prevent the pipe sample from sliding down through the arc groove 32. When the two ends of the pipe sample are bent, the pipe sample can be fixed in the arc groove 32 at the upper end of the limiting plate 31, so that there is enough space between the end of the pipe sample and the worktable 1, so that the two ends of the pipe sample can be aligned with the moving component 4. After the pipe sample is stably placed, air can be inflated from both ends of the pipe sample to perform air tightness testing.

[0036] See Figure 2 , Figure 6 and Figure 7 The upper surface of the workbench 1 is provided with multiple sliding grooves 13 that pass through the two moving grooves 11. The sliding grooves 13 are evenly distributed along the front and back direction. The left and right ends of the sliding grooves 13 are slidably connected to sliders 23. The upper surface of the sliders 23 is equipped with a moving plate 2. The upper surface of the moving plate 2 is provided with a square groove on the side near the center line of the workbench 1. An electric push rod 22 is provided in the square groove. The telescopic end of the electric push rod 22 is provided with a moving component 4.

[0037] The number of grooves 13 is the same as the number of plate groups. The height of the moving component 4 can be easily adjusted by the electric push rod 22. The moving plate 2 slides along the grooves 13 so that the distance between the two opposing moving components 4 can be adjusted according to the length of the pipe sample, so that the two opposing moving components 4 are fixedly installed at both ends of the pipe sample, thereby facilitating the airtightness test of the pipe sample.

[0038] See Figure 7 , Figure 8 and Figure 10The moving component 4 includes a moving block 41, a roller cavity 42, a square frame 45, and a fixing ring 432. The moving block 41 is installed on the telescopic end of the electric push rod 22. The vertical cross section of the moving block 41 in the left and right directions is L-shaped. A roller groove 411 is opened on the upper end face of the vertical section of the moving block 41. A circular hole 412 is opened at the central axis of the inner side wall of the roller groove 411. The roller cavity 42 is rotatably connected in the roller groove 411. An air inlet pipe 423 is provided on the front end face of the roller cavity 42. A shaft 422 is provided on the rear end face of the roller cavity 42. The shaft 422 and the air inlet pipe 423 are rotatably connected in the circular hole 412. A tapered tube 424 is provided on the annular surface of the roller cavity 42.

[0039] When the pipe sample to be tested is L-shaped or C-shaped, the roller cavity 42 can be rotated in the roller groove 411 to change the tilt angle of the tapered tube 424. At the same time, the height of the roller cavity 42 can be adjusted by the electric push rod 22, so that the two opposing roller cavities 42 can be aligned with the two ends of the pipe sample.

[0040] See Figure 3 , Figure 4 , Figure 5 and Figure 7 A fixed block 44 is provided at the middle of the upper end face of the horizontal section of the moving block 41. A T-shaped rod 441 is rotatably inserted through the fixed block 44. A wedge block 442 is fixed on the side of the T-shaped rod 441 near the roller cavity 42. A compression spring 443 is provided between the wedge block 442 and the fixed block 44. The compression spring 443 is sleeved on the T-shaped rod 441. Multiple slots 421 are equally spaced along the circumference of the annular surface of the roller cavity 42. The wedge block 442 engages with the slot 421 corresponding to its position.

[0041] When it is necessary to adjust the tilt angle of the tapered tube 424 on the roller cavity 42, first move the T-shaped rod 441 away from the roller cavity 42 so that the wedge block 442 is away from the slot 421. Then rotate the roller cavity 42. When the wedge block 442 is directly opposite the slot 421 at the corresponding position, release the T-shaped rod 441. Under the action of the compression spring 443, the wedge block 442 is engaged in the slot 421, the roller cavity 42 is fixed, and the tilt angle of the roller cavity 42 is adjusted.

[0042] See Figure 4 , Figure 5 , Figure 7 and Figure 8Four hinge seats 43 are fixed on the side of the tapered tube 424 near the roller cavity 42, distributed circumferentially. The hinge seats 43 are hinged to F-shaped pressing rods 431 by torsion spring rods. A rubber sheet is provided on the side of the pressing rods 431 near the tapered tube 424. A fixing ring 432 is sleeved on the outer side of the large diameter end of the tapered tube 424. The hinge seats 43 are located inside the fixing ring 432. Four arc-shaped limiting blocks 433 are fixed on the inner wall of the side of the fixing ring 432 away from the roller cavity 42. The limiting blocks 433 are evenly distributed along the circumference of the fixing ring 432, and the distance between two adjacent limiting blocks 433 is greater than the width of the pressing rods 431. The limiting blocks 433 are engaged in the notches on the outer side of the corresponding pressing rods 431.

[0043] The small-diameter end of the tapered tube 424 facilitates the alignment of the pipe sample with the tapered tube 424. During the docking process between the end of the pipe sample and the tapered tube 424, the pressing rod 431 is pushed away from the tapered tube 424 by the pipe sample. After the end of the pipe sample and the tapered tube 424 are docked, the pressing rod 431 is pressed against the surface of the pipe sample. Then, the fixing ring 432 is rotated so that the gap between the two adjacent limiting blocks 433 is aligned with the pressing rod 431. The fixing ring 432 is moved so that the limiting block 433 is locked in the notch of the corresponding pressing rod 431. At this time, both the fixing ring 432 and the pressing rod 431 are limited and fixed, which improves the docking firmness and tightness between the pipe sample and the tapered tube 424 and reduces the probability of errors in the airtightness test results of the pipe sample.

[0044] See Figure 4 , Figure 5 , Figure 7 and Figure 9 A T-shaped tube 46 is provided at the end of the air intake pipe 423 away from the roller cavity 42. The outer diameter of the side of the T-shaped tube 46 near the air intake pipe 423 is the same as the inner diameter of the air intake pipe 423. A square frame 45 is sleeved on the outside of the T-shaped tube 46. A threaded ring 453 is fixed on the side of the square frame 45 near the air intake pipe 423. An annular threaded groove 413 with the same center as the circular hole 412 is opened on the side of the moving block 41 near the square frame 45. The threaded ring 453 is threaded in the annular threaded groove 413. A sealing ring 462 is sleeved on the side of the T-shaped tube 46 near the air intake pipe 423. The sealing ring 462 is a rubber ring and is located on the side of the threaded ring 453 near the air intake pipe 423.

[0045] Rotate the frame 45, which drives the T-shaped tube 46 and the sealing ring 462 to move synchronously towards the air inlet pipe 423 until the T-shaped tube 46 and the air inlet pipe 423 are connected. At this time, the sealing ring 462 is pressed against the connection between the air inlet pipe 423 and the roller cavity 42. The sealing ring 462 can simultaneously provide an external seal for the connection between the air inlet pipe 423 and the roller cavity 42, and between the air inlet pipe 423 and the T-shaped tube 46, to prevent air leakage and thus further improve the accuracy of the air tightness test results of the pipeline sample.

[0046] See Figure 4 A flexible hose is fixedly connected to the side of the T-shaped tube 46 away from the air inlet pipe 423. The conical tube 424, the T-shaped tube 46, and the flexible hose are all connected to the inside of the roller cavity 42. The air pump inflates the tube, and the gas enters the roller cavity 42 along the air inlet pipe 423, then enters the pipe sample along the conical tube 424, until the gas enters the roller cavity 42 at the other end of the pipe sample. The flexible hose at the other end of the pipe sample is closed. The pressure is detected by the moving component 4 at the closed end of the flexible hose. After the pressure stabilizes, inflation is stopped. The stable pressure immediately after inflation is compared with the pressure after a period of time. If the pressure drops, it indicates that the pipe sample is leaking.

[0047] Working principle: S1, Pipe sample restriction: The pipe sample to be tested for air tightness is placed between the two limiting plates 31 in each group of plates. Then, the gear 33 is driven to rotate by the external drive motor, so that the sawtooth strips 3 move towards each other. The limiting plates 31 move synchronously. Finally, the limiting plates 31 clamp the pipe sample and restrict it through the arc groove 32 to prevent the pipe sample from sliding down.

[0048] S2. Adjustment of moving component 4: First, move the T-shaped rod 441 away from the roller cavity 42 so that the wedge block 442 is away from the slot 421. At this time, rotate the roller cavity 42. When the wedge block 442 is directly opposite the slot 421 at the corresponding position, release the T-shaped rod 441. Under the action of the compression spring 443, the wedge block 442 is engaged in the slot 421, and the roller cavity 42 is fixed. The tilt angle of the roller cavity 42 is adjusted. According to the shape of the pipe sample, adjust the height of the two opposing moving components 4 by the electric push rod 22 so that the two ends of the pipe sample can be aligned with the moving components 4.

[0049] S3. Fixing the moving component 4: During the docking process between the end of the pipe sample and the tapered tube 424, the pressing rod 431 is pushed by the pipe sample and rotates away from the tapered tube 424. After the end of the pipe sample and the tapered tube 424 are docked, the pressing rod 431 is pressed against the surface of the pipe sample. Then, the fixing ring 432 is rotated so that the gap between the two adjacent limiting blocks 433 is aligned with the pressing rod 431. The fixing ring 432 is moved so that the limiting block 433 is locked in the notch of the corresponding pressing rod 431. At this time, the fixing ring 432 and the pressing rod 431 are both limited and fixed. The moving plate 4 is pushed so that the other end of the pipe sample is fixed with the moving component of the other end in the same operation.

[0050] S4. Inflation Test: Rotate the square frame 45. The square frame 45 drives the T-shaped tube 46 and the sealing ring 462 to move synchronously towards the air inlet pipe 423 until the T-shaped tube 46 and the air inlet pipe 423 are connected. The sealing ring 462 can simultaneously provide an external seal for the connection between the air inlet pipe 423 and the roller cavity 42, and between the air inlet pipe 423 and the T-shaped tube 46. A hose is fixedly connected to the side of the T-shaped tube 46 away from the air inlet pipe 423. The air pump inflates through the hose. The gas enters the roller cavity 42 through the air hole of the T-shaped tube 46 from the air inlet pipe 423, and then enters the pipe sample through the tapered tube 424 until the gas enters the roller cavity 42 at the other end of the pipe sample. The hose at the other end of the pipe sample is closed. The pressure is tested by the moving component 4 at the closed end of the hose. After the pressure stabilizes, inflation is stopped. The stable pressure immediately after inflation is compared with the pressure after a period of time. If the pressure drops, it indicates that the pipe sample is leaking.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. An airtightness testing device for a high thermal conductivity modified PPS tube, comprising a worktable (1), a moving plate (2), a limiting plate (31), and a moving assembly (4), wherein a controller (14) is provided at the rear end of the worktable (1), characterized in that: Two through-slots (11) are opened in the middle of the upper end face of the workbench (1). Each slot (11) is equipped with a toothed strip (3). A gear (33) meshes between the two toothed strips (3). Three sets of plates for clamping pipes are equidistantly arranged from front to back on the upper end of the workbench (1). Each set of plates includes two limiting plates (31). The two limiting plates (31) in each set of plates are respectively installed on the upper end of the corresponding toothed strip (3). Multiple sliding grooves (13) that pass through the two through-slots (11) are opened on the upper end face of the workbench (1). Sliding blocks (23) are slidably connected to the left and right ends of the sliding grooves (13). A moving plate (2) is installed on the upper end face of the sliding block (23). A moving component (4) is provided on the upper end face of the moving plate (2). The moving component (4) includes a moving block (41), a roller cavity (42), a square frame (45), and a fixing ring (432). The upper end face of the vertical section of the moving block (41) is provided with a roller cavity (42). The front end face of the roller cavity (42) is provided with an air inlet pipe (423). The end of the air inlet pipe (423) away from the roller cavity (42) is provided with a T-shaped pipe (46). The outer side of the T-shaped pipe (46) is sleeved and connected with a square frame (45). The annular surface of the roller cavity (42) is provided with a tapered pipe (424). The side of the tapered pipe (424) close to the roller cavity (42) is provided with an F-shaped pressing rod (431). The annular surface of the roller cavity (42) is provided with multiple slots (421) at equal intervals along its circumference; A fixed block (44) is provided at the middle of the upper end face of the horizontal section of the moving block (41). A T-shaped rod (441) is rotatably inserted through the fixed block (44). A wedge block (442) is fixed on the side of the T-shaped rod (441) near the roller cavity (42). A compression spring (443) is provided between the wedge block (442) and the fixed block (44). The compression spring (443) is sleeved on the T-shaped rod (441). The wedge block (442) is engaged with the corresponding slot (421).

2. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 1, characterized in that: Each of the two limiting plates (31) in each group of plates has multiple arc-shaped grooves (32) that are equally distributed in the vertical direction on their opposite surfaces. The serrations of the two saw teeth (3) are arranged opposite each other. The front end face of the upper end of the worktable (1) has a circular groove (12) that is located between the moving grooves (11) and communicates with all the moving grooves (11). The gear (33) is rotatably installed in the circular groove (12).

3. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 1, characterized in that: The slide grooves (13) are distributed at equal distances along the front and back directions. The number of slide grooves (13) is the same as the number of plate groups. The slider (23) is slidably connected in the slide groove (13). A square groove is opened on the side of the upper end face of the moving plate (2) near the center line of the worktable (1). An electric push rod (22) is installed in the square groove.

4. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 3, characterized in that: The movable block (41) is installed at the telescopic end of the electric push rod (22). The vertical cross section of the movable block (41) in the left and right directions is L-shaped. A roller groove (411) is provided on the upper end face of the vertical section of the movable block (41). A round hole (412) is provided at the central axis of the inner side wall of the roller groove (411). A roller cavity (42) is rotatably connected in the roller groove (411). A shaft (422) is provided at the rear end of the roller cavity (42). The shaft (422) and the air inlet pipe (423) are rotatably connected in the round hole (412).

5. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 4, characterized in that: The outer diameter of the T-shaped tube (46) near the air intake pipe (423) is the same as the inner diameter of the air intake pipe (423). A threaded ring (453) is fixed on the side of the frame (45) near the air intake pipe (423). An annular threaded groove (413) with the same center as the circular hole (412) is opened on the side of the moving block (41) near the frame (45). The threaded ring (453) is threaded into the annular threaded groove (413). A sealing ring (462) is sleeved on the side of the T-shaped tube (46) near the air intake pipe (423). The sealing ring (462) is a rubber ring. The sealing ring (462) is located on the side of the threaded ring (453) near the air intake pipe (423). A hose is fixedly connected on the side of the T-shaped tube (46) away from the air intake pipe (423).

6. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 5, characterized in that: The tapered tube (424), T-shaped tube (46), and hose are all connected to the inside of the roller cavity (42). Four hinge seats (43) are fixed on the side of the tapered tube (424) near the roller cavity (42) and distributed along its circumference. The hinge seats (43) are hinged to F-shaped pressing rods (431) by torsion spring rods. The F-shaped pressing rods (431) are provided with rubber sheets on the side of the tapered tube (424). A fixing ring (432) is sleeved on the outer side of the large diameter end of the tapered tube (424), and the hinge seats (43) are located inside the fixing ring (432).

7. The airtightness testing device for a high thermal conductivity modified PPS tube according to claim 6, characterized in that: Four arc-shaped limiting blocks (433) are fixed on the inner wall of the fixed ring (432) away from the roller cavity (42). The limiting blocks (433) are evenly distributed along the circumference of the fixed ring (432), and the distance between two adjacent limiting blocks (433) is greater than the width of the F-shaped pressing rod (431). The limiting blocks (433) are engaged in the notches on the outer side of the corresponding F-shaped pressing rod (431).

Images