Air tightness detection equipment

Abstract

The utility model discloses air tightness detection equipment, which relates to the field of air tightness detection and comprises a rack, a tool plate is arranged on the rack, and a plurality of limiting columns are arranged on the tool plate and used for positioning irregular-shaped workpieces. A profiling pressing tool is arranged above the tool plate, the profiling pressing tool is fixed to the upper surface of the rack, the profiling pressing tool comprises a hydraulic cylinder, the lower portion of the hydraulic cylinder is connected with a pressing column, and the hydraulic cylinder drives the pressing column to move downwards to press a workpiece on the tool plate; an air pressure detection device is arranged below the tool plate and comprises an air source and an upper pressing air cylinder connected with the air source, and a first pressure regulating valve is arranged between the air source and the upper pressing air cylinder and used for controlling the air pressure to be stable and within a normal detection range in the air tightness detection process; the air inlet speed can be adjusted in the air inflation stage by adopting the pressure adjusting valve, and small-flow air inlet can be realized when the pressure is close to the set pressure, so that the accuracy of the air inflation pressure is improved, the stability of the air pressure is controlled, and meanwhile, the whole detection efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the field of air tightness detection, in particular to an air tightness detection device. Background Art

[0002] Air tightness is an indicator of the tightness of a device. The quality of the air tightness of a device is related to whether the device has a leak defect. Therefore, for some devices with high quality requirements, it is very necessary to conduct air tightness testing before they are produced and shipped.

[0003] The end cover is a rear cover installed behind the motor housing, commonly known as the "end cover". The quality of the end cover directly affects the service life of the motor. The sealing performance of the end cover needs to be tested before it leaves the factory to ensure the quality of the product.

[0004] Most of the existing air tightness testing equipment will fill the air in the closed space formed by the workpiece and the testing tooling to reach the set air pressure value, and then obtain the test results of the workpiece through the change of the pressure value. During the inflation process, if the inflation is too fast, it is easy to exceed the set pressure, affecting the accuracy of the test results obtained by the staff based on the pressure change; if the inflation is slow, the efficiency of the air tightness test is too low, which is not suitable for large-scale testing. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides an air tightness detection device, which can realize automatic adjustment of the air intake speed, can reach the set pressure more accurately, and improve the detection efficiency at the same time.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An airtightness detection device, comprising

[0008] A frame, a tooling plate is arranged on the frame, and a plurality of limit columns are arranged on the tooling plate for positioning; a profiling pressing tool is arranged above the tooling plate, and the profiling pressing tool is fixed on the upper surface of the frame, and the profiling pressing tool comprises a hydraulic cylinder, and a pressing column is connected below the hydraulic cylinder, and the hydraulic cylinder drives the pressing column to move downward and press it tightly on the tooling plate;

[0009] An air pressure detection device is provided under the tooling plate, and the air pressure detection device is provided under the tooling plate, and includes an air source and an upper pressure cylinder connected to the air source. A first pressure regulating valve is provided between the air source and the upper pressure cylinder, which is used to control the air pressure to be stable and within a normal detection range during the air tightness detection process.

[0010] Furthermore, a plurality of sealing gaskets of different thicknesses are provided on the tooling plate, and the thickness and shape of the sealing gaskets are adapted to the setting.

[0011] Furthermore, a plurality of pressure columns are provided.

[0012] Furthermore, an air inlet and an air outlet are provided on the tooling plate, and the upper pressure cylinder is connected to the air inlet through an air pipe to control the on and off of air intake.

[0013] Furthermore, the air pressure detection device also includes a downward pressure cylinder, one end of which is connected to the air outlet, and the other end is connected to the exhaust pipe for controlling the exhaust on and off.

[0014] Furthermore, the gas source adopts an external air compressor, and a gas tank is connected between the external air compressor and the upper pressure cylinder to play a role in maintaining pressure.

[0015] Furthermore, a flow detector is provided between the upper pressure cylinder and the air inlet, which can detect the air flow of the intake in real time.

[0016] Furthermore, a second pressure regulating valve is provided between the downward pressure cylinder and the exhaust pipe for controlling the air release speed.

[0017] Furthermore, it also includes a PLC controller, which is connected to the hydraulic cylinder, the upper pressure cylinder, the lower pressure cylinder and the first pressure regulating valve, and realizes the automatic operation of the detection equipment after pressing the control button.

[0018] Furthermore, a control button is provided on the upper surface of the frame to facilitate operation by the staff; two control buttons are provided, both of which are connected to the PLC controller; the two control buttons are arranged at a certain distance from each other, and the two control buttons need to be pressed at the same time to start the device, which can avoid starting the device due to accidental touch or misoperation, thereby ensuring the safety of the staff.

[0019] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0020] 1. The utility model adopts a pressure regulating valve to adjust the air intake speed during the inflation stage, and can achieve small flow air intake when close to the set pressure, thereby improving the accuracy of the inflation pressure, controlling the stability of the air pressure, and ensuring the overall air intake efficiency.

[0021] 2. The utility model can adapt to the irregular shape of the workpiece for positioning through the combination of multiple limit columns and sealing pads of different thicknesses, so as to better simulate the actual use of the workpiece.

[0022] 3. After the start control button is turned on, the detection process can be automatically completed through the cooperation of the PLC controller, the detection components and the execution components, with a high degree of automation, saving time and effort.

[0023] 4. The utility model is provided with a flow detector to detect the air flow of the intake air, and can intuitively and accurately judge whether the workpiece is qualified by the state of the intake air flow after setting the air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 ;

[0026] Figure 2 The overall structure of the utility model is shown in FIG. Figure 2

[0027] Figure 3 This is the front view of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the utility model after removing the cabinet door;

[0029] Figure 5 This is the front view of the utility model after removing the cabinet door.

[0030] In the figure: 1, frame; 101, cabinet door; 2, tooling plate; 201, limit column; 202, sealing gasket; 203, air inlet; 204, air outlet; 3, contour pressing tooling; 301, hydraulic cylinder;

[0031] 302, pressure column; 4, air pressure detection device; 401, upper pressure cylinder; 402, first pressure regulating valve; 403, gas tank; 404, flow monitoring meter; 405, lower pressure cylinder; 406, second pressure regulating valve; 5, control button; 6, control panel. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] Embodiment 1

[0035] In a typical embodiment of the present application, a workpiece air tightness detection device is provided, such as Figure 1-5 As shown, the machine frame 1 is provided with a tooling plate 2, and a plurality of limit columns 201 are provided on the tooling plate for positioning the workpiece; a profiling pressing tool 3 is provided above the tooling plate, and the profiling pressing tool 3 is fixed on the frame 1, and the profiling pressing tool comprises a hydraulic cylinder 301, and a pressing column 302 is connected below the hydraulic cylinder, and the hydraulic cylinder can drive the pressing column to move downward to press the workpiece onto the tooling plate;

[0036] An air pressure detection device 4 is provided under the tooling plate. The air pressure detection device 4 is arranged under the tooling plate 2, and includes an air source and an upper pressure cylinder 401 connected to the air source. A first pressure regulating valve 402 is provided between the air source and the upper pressure cylinder for adjusting the air intake speed. The air pressure can be controlled to be stable and within a normal detection range during the air tightness detection process.

[0037] In order to achieve the same as the actual use conditions and ensure the sealing between the tooling plate and the workpiece, a plurality of sealing pads 202 of different thicknesses are provided on the tooling plate, and the thickness of the sealing pads is adapted to the shape of the workpiece to be tested. The airtightness testing equipment of this embodiment can be used to test parts of different shapes and specifications, such as bearing end covers, oil pans, etc., and sealing pads of different thicknesses can meet a variety of testing conditions and have better adaptability.

[0038] like Figure 1-3 As shown, a plurality of pressure columns 302 are arranged above the tooling plate, and the pressure columns 302 are connected to the hydraulic cylinder 301. Specifically, the arrangement of the pressure columns should be the same as the number and position of the workpiece fixing bolts, simulating the action of the fixing bolts to press the workpiece against the tooling plate. Since the number and position distribution of pressure columns are different for workpieces of different shapes and specifications, the preferred embodiment is that the mounting plate connected to the top of the plurality of pressure columns is detachably mounted. When replacing the inspection workpiece, the mounting plate together with the pressure column part can be directly disassembled and replaced with a suitable pressure column combination structure, which is simple to operate.

[0039] like Figure 4 As shown, an air inlet 203 and an air outlet 204 are provided on the tooling plate, and the upper pressure cylinder 401 is connected to the air inlet 203 through an air pipe to control the on and off of air intake.

[0040] In this embodiment, the gas source is an external air compressor, and a gas tank 403 is connected between the external air compressor and the upper pressure cylinder. The gas tank is used to maintain pressure. Since the test requires a large amount of gas, a gas tank is installed to maintain pressure. A flow detector is provided between the upper pressure cylinder and the air inlet, which is used to detect the air flow of the intake in real time and display it on the display screen of the control panel.

[0041] In addition, if Figure 4-5As shown, the air pressure detection device 4 also includes a downward pressure cylinder 405, one end of which is connected to the air outlet, and the other end is connected to the exhaust pipe for controlling the exhaust on and off.

[0042] Preferably, a second pressure regulating valve 406 is provided between the downward pressure cylinder and the exhaust pipe for controlling the air release speed.

[0043] like Figure 1 , 3 As shown, the upper surface of the frame is provided with control buttons 5 and a control panel 6, which are convenient for the staff to operate, observe and control. Specifically, each detection device is provided with two control buttons, and the two control buttons are provided at a certain distance. In this embodiment, the two control buttons are respectively provided at both ends of the device. The two control buttons need to be pressed at the same time to start the device, which can avoid the workers from accidentally touching or operating the device, thereby ensuring the safety of the staff. The control panel 6 includes a display screen, which can display the air intake flow rate and the set air pressure value, etc.

[0044] In addition, the present embodiment further includes a PLC controller, which is connected to a control button, a flow meter, a hydraulic cylinder, an upper pressure cylinder, a lower pressure cylinder, a first pressure regulating valve, a second pressure regulating valve and a control panel. After pressing the control button, the automatic operation of the detection equipment can be realized to complete the air tightness detection of the workpiece to be detected. The PLC controller can control and adjust the opening of the first regulating valve during the air intake stage, thereby improving the accuracy of the set air pressure value required to meet the air tightness requirements, ensuring the accuracy of the detection, and improving the detection efficiency.

[0045] The flow meter detects the intake air flow and feeds it back to the PLC controller, which is displayed on the display screen of the control panel. The staff can observe the changes in the intake air flow in real time.

[0046] As attached Figure 1-4 As shown, in this embodiment, in order to improve the detection efficiency, two sets of detection equipment are integrated into one rack to save the operation time of the staff. In actual application, it can be flexibly selected according to needs.

[0047] The working principle of this embodiment is:

[0048] Place the workpiece to be tested on the tooling board and limit the workpiece by the limit column. When the two control buttons are pressed at the same time, the air tightness test equipment starts, and the PLC controller controls the hydraulic rod of the hydraulic cylinder to extend and drive the pressure column to press the workpiece against the tooling board, so that the workpiece and the tooling board fit tightly and form a closed space between the two. At this time, the upper pressure cylinder opens, and air is injected into the closed space through the air inlet hole on the tooling board. The air pressure in the closed space will gradually increase. When the air pressure in the closed space reaches the set air pressure value required for air tightness, the system will judge whether the product air tightness is qualified through the feedback of the flow meter:

[0049] If the air flow through the flow meter gradually and eventually decreases to zero, the product's air tightness is qualified; if the air flow through the flow meter is continuous, the product is unqualified.

[0050] After the test is completed, the upper pressure cylinder is closed and the lower pressure cylinder is opened to release the air in the confined space. The second pressure regulating valve can control the pressure release speed to prevent the air pressure from dropping too quickly. After the pressure release is completed, the contoured downward pressure tooling above the workpiece moves up to release the workpiece, remove the workpiece, and complete the test.

[0051] The air tightness detection device of this embodiment can be applied to the air tightness detection of various components, including but not limited to special-shaped components such as oil pans and bearing end covers, and has easy operation, accurate detection results, and a high degree of automation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Those skilled in the art should understand that the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An airtightness detection device, characterized in that: include A frame, wherein a tooling plate is arranged on the frame, and a plurality of limit columns are arranged on the tooling plate for positioning the workpiece; a profiling pressing tool is arranged above the tooling plate, and the profiling pressing tool is fixed on the upper surface of the frame, and the profiling pressing tool comprises a hydraulic cylinder, and a pressing column is connected below the hydraulic cylinder, and the hydraulic cylinder drives the pressing column to move downward to press the workpiece tightly on the tooling plate; An air pressure detection device is provided under the tooling plate, and the air pressure detection device is provided under the tooling plate, and includes an air source and an upper pressure cylinder connected to the air source. A first pressure regulating valve is provided between the air source and the upper pressure cylinder, which is used to control the air pressure to be stable and within a normal detection range during the air tightness detection process.

2. An airtightness detection device as claimed in claim 1, characterized in that: The tooling plate is provided with a plurality of sealing pads of different thicknesses, and the thickness of the sealing pads is set to adapt to the shape of the workpiece.

3. The airtightness detection device according to claim 1, characterized in that: The pressure column is provided in plurality.

4. The airtightness detection device according to claim 1, characterized in that: The tooling plate is provided with an air inlet and an air outlet, and the upper pressure cylinder is connected to the air inlet through an air pipe to control the on and off of air intake.

5. An airtightness detection device as claimed in claim 4, characterized in that: A flow detector is arranged between the upper pressure cylinder and the air inlet.

6. An airtightness detection device as claimed in claim 5, characterized in that: The air pressure detection device also includes a downward pressure cylinder, one end of which is connected to the air outlet, and the other end of which is connected to the exhaust pipe.

7. The airtightness detection device according to claim 1, characterized in that: The gas source adopts an external air compressor, and a gas tank is connected between the external air compressor and the upper pressure cylinder.

8. The airtightness detection device according to claim 6, characterized in that: A second pressure regulating valve is arranged between the downward pressure cylinder and the exhaust pipe.

9. An airtightness detection device as claimed in claim 8, characterized in that: It also includes a PLC controller, which is connected to the hydraulic cylinder, the upper pressure cylinder, the lower pressure cylinder, the flow meter and the first pressure regulating valve.

10. An airtightness detection device as claimed in claim 9, characterized in that: The upper surface of the frame is provided with control buttons, and two control buttons are provided, both of which are connected to the PLC controller.

Images