Air tightness testing tool for cooling pump impeller

Abstract

A cooling pump impeller air tightness test tool comprises a tool bottom plate, and the upper end face of the tool bottom plate is provided with a positioning shaft sleeve, a guide column, a guide shaft sleeve, a tool main plate, a pressing mechanism, a lifting mechanism, an air path system and a control system. The guide columns are vertically arranged on the left side and the right side of the upper end face of the tool bottom plate, the positioning shaft sleeves are arranged on the outer circumferences of the lower ends of the guide columns, the guide shaft sleeves are arranged on the outer circumferences of the upper ends of the guide columns in a sleeving mode, the upper ends of the guide columns are fixedly connected with the tool main plate, and the pressing mechanism is arranged on the upper end face of the tool main plate. The air path system is arranged on the lower end face of the tool main plate and connected with the pressing mechanism and the lifting mechanism, the control system is connected with the pressing mechanism, the lifting mechanism and the air path system, and the control system is used for controlling the working conditions of all components and timing. The testing tool is high in automation degree, convenient to operate and high in compatibility.

Description

Technical Field

[0001] This invention relates to the technical field of airtightness testing equipment for mechanical parts, and specifically to a testing fixture for the airtightness of a cooling pump impeller. Background Technology

[0002] In the production process of cooling pump impellers, air tightness testing is a crucial step in ensuring product quality. In existing technology, impeller air tightness testing uses a manually operated fixture. The specific procedure is as follows: the operator manually rotates the fixture's pressure plate on a platform, tightening the product by tightening the nut; after manually turning on the air pressure, the fixture and product are lifted together into a water tank to observe the air tightness; the pressure holding time is controlled by the operator's intuition, and the above steps are repeated after the test is completed.

[0003] The aforementioned prior art has the following drawbacks: 1. The use of hand-held tooling results in high labor intensity for operators; 2. Only 2 products can be tested at a time, resulting in low testing efficiency; 3. Different impeller models require different tooling, and the replacement and debugging process is time-consuming and labor-intensive, with poor compatibility; 4. The pressure holding time relies on manual judgment, which can easily lead to misjudgment due to insufficient pressure holding, affecting the consistency of product quality.

[0004] Therefore, there is an urgent need for a testing fixture that can reduce labor intensity, improve testing efficiency, ensure pressure holding accuracy, and has strong compatibility, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a testing fixture for the airtightness of a cooling pump impeller. This testing fixture is highly automated, easy to operate, and highly compatible.

[0006] The objective of this invention is achieved through the following solution: a cooling pump impeller airtightness testing fixture, comprising a fixture base plate, wherein a positioning bushing, a guide column, a guide bushing, a fixture main plate, a clamping mechanism, a lifting mechanism, an air circuit system, and a control system are provided on the upper surface of the fixture base plate; the guide column is vertically arranged on the left and right sides of the upper surface of the fixture base plate, a positioning bushing is provided on the lower outer circumference of the guide column, a guide bushing is fitted on the upper outer circumference of the guide column, the upper end of the guide column is connected and fixed to the fixture main plate, a clamping mechanism is provided on the upper surface of the fixture main plate, the lower end of the lifting mechanism is connected and fixed to the fixture base plate, the air circuit system is provided on the lower surface of the fixture main plate, and the air circuit system is connected to the clamping mechanism and the lifting mechanism respectively; the control system is connected to the clamping mechanism, the lifting mechanism, and the air circuit system respectively, and the control system is used to control the operating conditions of each component and timing.

[0007] The clamping mechanism includes a clamping cylinder, a clamping arm, a clamping column, a clamping cylinder support block, and a clamping cylinder support column. The clamping cylinder is mounted on the upper surface of the main tooling plate. The clamping cylinder is fixed to the top of the clamping cylinder support column by the clamping cylinder support block. The lower end of the clamping cylinder support column is fixed to the main tooling plate by a lower fastening nut. The upper end of the clamping cylinder support column is positioned by an upper fastening nut. The front end of the clamping arm is connected and fixed to the output end of the clamping cylinder. The rear end of the clamping arm is connected and fixed to the clamping column. The lower end of the clamping column is connected to the workpiece.

[0008] The lifting mechanism includes a lifting cylinder, a lifting cylinder support column, a lifting arm, lifting arm fastening bolts, a spring fixing seat, and an auxiliary lifting spring. The lifting cylinder is connected and fixed to the tooling base plate through the lifting cylinder support column. The output end of the lifting cylinder is connected and fixed to the tooling main board through the lifting arm and the lifting arm fixing bolts. A spring fixing seat is provided between the lifting cylinder support columns. An auxiliary lifting spring is provided at the upper end of the spring fixing seat. The upper end of the auxiliary lifting spring is connected to the lower end of the lifting arm.

[0009] The air circuit system includes an air pipe, an air pipe five-way connector, and an integrated air inlet sealing device. The air pipe is connected to the air source and the integrated air inlet sealing device through the air pipe five-way connector. The integrated air inlet sealing device is set correspondingly to the workpiece. The outer diameter of the upper end of the integrated air inlet sealing device is smaller than the inner diameter of the cavity of the workpiece. The upper end of the integrated air inlet sealing device extends into the cavity of the workpiece. A sealing ring is provided at the connection between the integrated air inlet sealing device and the workpiece. The lower end of the integrated air inlet sealing device is connected to the air pipe.

[0010] The control system includes a PLC controller and a timer integrated therein. The PLC controller is connected to the pressing mechanism, the lifting mechanism, and the pneumatic system.

[0011] The tooling motherboard is equipped with multiple clamping mechanisms, and the clamping arms in the clamping mechanisms can rotate 90°.

[0012] The advantages of this invention are: 1. High degree of automation: By replacing manual pressing and lifting operations with pneumatic devices and in conjunction with PLC control, the labor intensity of operators is greatly reduced; 2. High testing efficiency: The pneumatic clamping and lifting action responds quickly, with the front and rear action intervals accurate to the millisecond level, and multiple products can be tested simultaneously (adapted to the size of the tooling motherboard). 3. Improved testing accuracy: The holding time is precisely controlled by PLC, avoiding human judgment errors, reducing misjudgments, and improving product quality consistency; 4. Strong compatibility: Through the adaptable design of the positioning bushing and clamping mechanism, it can be compatible with the testing of all models of water pump impellers of the company, without the need for frequent tooling changes, saving debugging time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the workpiece structure. Detailed Implementation

[0014] like Figures 1 to 3 As shown, a cooling pump impeller airtightness testing fixture includes a fixture base plate 1. The upper surface of the fixture base plate 1 is provided with a positioning bushing 2, a guide column 3, a guide bushing 4, a fixture main plate 5, a clamping mechanism, a lifting mechanism, an air passage system, and a control system. The guide column 3 is vertically arranged on the left and right sides of the upper surface of the fixture base plate 1. The lower outer circumference of the guide column 3 is provided with a positioning bushing 2, and the upper outer circumference of the guide column 3 is fitted with a guide bushing 4. The upper end of the guide column 3 is connected and fixed to the fixture main plate 5. The upper surface of the fixture main plate 5 is provided with a clamping mechanism. The lower end of the lifting mechanism is connected and fixed to the fixture base plate 1. The air passage system is located on the lower surface of the fixture main plate 5 and is connected to the clamping mechanism and the lifting mechanism respectively. The control system is connected to the clamping mechanism, the lifting mechanism, and the air passage system respectively. The control system is used to control the operating conditions of each component and to time the process.

[0015] The clamping mechanism includes a clamping cylinder 9, a clamping arm 20, a clamping column 19, a clamping cylinder support block 7, and a clamping cylinder support column 23. The clamping cylinder 9 is mounted on the upper surface of the tooling main board 5. The clamping cylinder 9 is fixed to the top of the clamping cylinder support column 23 via the clamping cylinder support block 7. The lower end of the clamping cylinder support column 23 is fixed to the tooling main board 5 via a lower fastening nut 22, and the upper end of the clamping cylinder support column 23 is positioned via an upper fastening nut 24. The front end of the clamping arm 20 is connected and fixed to the output end of the clamping cylinder 9, and the rear end of the clamping arm 20 is connected and fixed to the clamping column 19. The lower end of the clamping column 19 is connected to the workpiece 18. Multiple clamping mechanisms are provided on the tooling main board 5, and the clamping arm 20 in the clamping mechanism can rotate 90°. The lifting mechanism includes a lifting cylinder 10, a lifting cylinder support column 13, a lifting arm 15, a lifting arm fastening bolt 14, a spring fixing seat 11, and an auxiliary lifting spring 12. The lifting cylinder 10 is connected and fixed to the tooling base plate 1 via the lifting cylinder support column 13. The output end of the lifting cylinder 10 is connected and fixed to the tooling main plate 5 via the lifting arm 15 and the lifting arm fixing bolt 14. A spring fixing seat 11 is provided between the lifting cylinder support columns 13. An auxiliary lifting spring 12 is provided at the upper end of the spring fixing seat 11. The upper end of the auxiliary lifting spring 12 is connected to the lower end of the lifting arm 15. The pneumatic system includes an air pipe 6, an air pipe five-way connector 8, and an integrated air inlet sealing device 16. The air pipe 6 connects to the air source and the integrated air inlet sealing device 16 via the air pipe five-way connector 8. The integrated air inlet sealing device 16 is correspondingly positioned to the workpiece 18. The outer diameter of the upper end of the integrated air inlet sealing device 16 is smaller than the inner diameter of the cavity 18-1 of the workpiece 18. The upper end of the integrated air inlet sealing device 16 extends into the cavity 18-1 of the workpiece 18. A sealing ring 17 is provided at the connection between the integrated air inlet sealing device 16 and the workpiece 18. The lower end of the integrated air inlet sealing device 16 is connected to the air pipe 6. The control system includes a PLC controller and a timer integrated therein. The PLC controller is connected to the pressing mechanism, the lifting mechanism, and the pneumatic system.

[0016] During operation, place the impeller to be tested on the positioning sleeve, press the start button, and the PLC controller will execute the following steps according to the preset program: the clamping arm rotates 90° and clamps the impeller → the air system is ventilated → the lifting cylinder extends and the fixture main board sinks underwater → the timer starts → after the pressure holding period ends, the lifting cylinder retracts and the fixture main board rises out of the water with the help of the spring → the clamping cylinder resets → the impeller is removed, and the test is completed.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fixture for testing the air tightness of a cooling pump impeller, comprising a fixture base plate (1), characterized in that: The upper surface of the tooling base plate (1) is provided with a positioning bushing (2), a guide column (3), a guide bushing (4), a tooling main plate (5), a clamping mechanism, a lifting mechanism, an air circuit system, and a control system. The guide column (3) is vertically arranged on the left and right sides of the upper surface of the tooling base plate (1). The lower outer circumference of the guide column (3) is provided with a positioning bushing (2), and the upper outer circumference of the guide column (3) is fitted with a guide bushing (4). The upper end of the guide column (3) is connected and fixed to the tooling main plate (5). The upper surface of the tooling main plate (5) is provided with a clamping mechanism. The lower end of the lifting mechanism is connected and fixed to the tooling base plate (1). The air circuit system is arranged on the lower surface of the tooling main plate (5). The air circuit system is connected to the clamping mechanism and the lifting mechanism respectively. The control system is connected to the clamping mechanism, the lifting mechanism, and the air circuit system respectively. The control system is used to control the working conditions of each component and timing.

2. The cooling pump impeller airtightness testing fixture according to claim 1, characterized in that: The clamping mechanism includes a clamping cylinder (9), a clamping arm (20), a clamping column (19), a clamping cylinder support block (7), and a clamping cylinder support column (23). The clamping cylinder (9) is set on the upper end face of the tooling main board (5). The clamping cylinder (9) is fixed to the top of the clamping cylinder support column (23) by the clamping cylinder support block (7). The lower end of the clamping cylinder support column (23) is fixed to the tooling main board (5) by the lower fastening nut (22). The upper end of the clamping cylinder support column (23) is positioned by the upper fastening nut (24). The front end of the clamping arm (20) is connected and fixed to the output end of the clamping cylinder (9) by the fastening bolt (21). The rear end of the clamping arm (20) is connected and fixed to the clamping column (19). The lower end of the clamping column (19) is connected to the workpiece (18).

3. The cooling pump impeller airtightness testing fixture according to claim 1, characterized in that: The lifting mechanism includes a lifting cylinder (10), a lifting cylinder support column (13), a lifting arm (15), a lifting arm fastening bolt (14), a spring fixing seat (11), and an auxiliary lifting spring (12). The lifting cylinder (10) is connected and fixed to the tooling base plate (1) through the lifting cylinder support column (13). The output end of the lifting cylinder (10) is connected and fixed to the tooling main board (5) through the lifting arm (15) and the lifting arm fixing bolt (14). A spring fixing seat (11) is provided between the lifting cylinder support columns (13). An auxiliary lifting spring (12) is provided at the upper end of the spring fixing seat (11). The upper end of the auxiliary lifting spring (12) is connected to the lower end of the lifting arm (15).

4. The cooling pump impeller airtightness testing fixture according to claim 1, characterized in that: The air system includes an air pipe (6), an air pipe five-way connector (8), and an air inlet sealing device (16). The air pipe (6) is connected to the air source and the air inlet sealing device (16) through the air pipe five-way connector (8). The air inlet sealing device (16) is set correspondingly to the workpiece (18). The outer diameter of the upper end of the air inlet sealing device (16) is smaller than the inner diameter of the cavity (18-1) of the workpiece (18). The upper end of the air inlet sealing device (16) extends into the cavity (18-1) of the workpiece (18). A sealing ring (17) is provided at the connection between the air inlet sealing device (16) and the workpiece (18). The lower end of the air inlet sealing device (16) is connected to the air pipe (6).

5. The cooling pump impeller airtightness testing fixture according to claim 1, characterized in that: The control system includes a PLC controller and a timer integrated therein. The PLC controller is connected to the pressing mechanism, the lifting mechanism, and the pneumatic system.

6. The cooling pump impeller airtightness testing fixture according to claim 1, characterized in that: The tooling main board (5) is provided with multiple clamping mechanisms, and the clamping arm (20) in the clamping mechanism can rotate 90°.

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