A flywheel shell processing detection device

Abstract

The application discloses a detection device for flywheel shell machining and relates to the field of flywheel shell machining.The detection device comprises a detection platform, a rotary driving mechanism, a leakage point detection head and a stop opening contour runout detection mechanism.The leakage point detection head is rotatably arranged on the detection platform through the rotary driving mechanism.The leakage point detection head is internally provided with an airflow channel penetrating through both ends of the leakage point detection head.A gas pressure sensing element is arranged on the leakage point detection head.A capacitance detection unit electrically connected with the gas pressure sensing element is arranged on the detection platform.The leakage point detection head connected with the stop opening runout detection mechanism at one end is driven by the rotary driving mechanism to slide along the inner wall of the stop opening on the flywheel shell to detect the machining quality of the stop opening on the flywheel shell, so as to eliminate the hidden danger of the negative influence of the machining quality of the stop opening on the assembly and sealing of the flywheel shell.The airflow channel can be in communication with the leakage point when the leakage point detection head passes through the leakage point.The gas pressure sensing element on the leakage point detection head can detect the flow or pressure change of the gas in the airflow channel, so as to determine the position of the leakage point of the flywheel shell.

Description

Technical Field

[0001] This invention belongs to the field of flywheel housing processing, and specifically relates to a testing device for flywheel housing processing. Background Technology

[0002] The flywheel housing is the outer casing used for gearbox connections. For the airtightness testing of the flywheel housing, since lubricating oil needs to be added inside the flywheel housing, a decrease in airtightness may lead to lubricating oil leakage, which is not conducive to its use. Therefore, the airtightness needs to be tested during the processing of the flywheel housing.

[0003] Current airtightness testing equipment can generally only detect defects on the end face of the flywheel housing, making it difficult to detect the location of leaks or defects. Furthermore, it cannot simultaneously test the machining quality of the flywheel housing's stop, specifically the stop runout. This stop runout is crucial; poor control of this dimensional tolerance can lead to inadequate sealing of the flywheel housing during subsequent use. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for flywheel housing processing, so as to solve the above-mentioned defects caused by the prior art.

[0005] A testing device for flywheel housing processing includes a testing platform, a rotary drive mechanism, a leak detection head, and a stop profile runout detection mechanism. The leak detection head is horizontally rotatable on the testing platform via the rotary drive mechanism. One end of the leak detection head is connected to the stop profile runout detection mechanism, and the other end of the leak detection head abuts against the side wall of the stop on the flywheel housing under the push of the stop profile runout detection mechanism. The rotation axis of the leak detection head is coaxial with the axis of the flywheel housing.

[0006] The leak detection head has an airflow channel through both ends for leaking gas to pass through. The leak detection head is equipped with a pressure sensing element for detecting the air pressure or gas flow rate in the airflow channel. The detection platform is equipped with a capacitance detection unit that is electrically connected to the pressure sensing element.

[0007] Preferably, the stop profile runout detection mechanism includes an electronic dial indicator, a signal transmission module, and a signal processing terminal connected in sequence. The leak detection head is connected to the electronic dial indicator, and the detection data of the electronic dial indicator is sent to the signal processing terminal for recording via the signal transmission module.

[0008] Preferably, the leak detection head has a rectangular hole that communicates with the airflow channel;

[0009] The pressure sensing element includes an elastic insulating film and two conductive wires. The two conductive wires are arranged parallel to each other and spaced apart within the elastic insulating film. The two sides of the elastic insulating film parallel to the conductive wires are respectively arranged on the inner walls of the two sides of the rectangular hole. The same end of the two conductive wires is electrically connected through a solder ball. The elastic insulating film and the two conductive wires form a microcapacitor. The solder ball is electrically connected to the capacitance detection unit with capacitance detection function through an insulating wire.

[0010] Preferably, the dielectric constant of the elastic insulating film is less than that of air.

[0011] Preferably, the solder ball is attached to the end of the elastic insulating film and located between the two sides of the elastic insulating film, and the solder ball is spaced from the inner wall of the rectangular hole. The insulating wire is provided with slack to allow the solder ball to move with the deformation of the elastic insulating film.

[0012] Preferably, the leak detection head includes an opening top plate with the rectangular hole and strip-shaped side plates on both sides of the bottom of the opening top plate. An airflow channel is formed between the opening top plate and the strip-shaped side plates on both sides, and the end of the opening top plate that is used to contact the stop side wall is arc-shaped, so that the opening top plate can improve the sensitivity of the runout detection by making point contact with the stop side wall.

[0013] Preferably, the rotary drive mechanism includes an annular electric rail and a slider driven by the annular electric rail, the electronic dial indicator is disposed on the slider, the detection platform is provided with an annular groove for the annular electric rail and the slider to be embedded, and the detection platform is provided with an elastic rubber sealing post located at the axis of the annular electric rail for sealing the shaft hole on the flywheel housing.

[0014] Preferably, the electronic dial indicator is rotatably mounted on the slider via a rotating tray.

[0015] Preferably, the slider is provided with a servo motor that is drivenly connected to the rotating tray, and the slider is provided with a contact switch that is electrically connected to the servo motor. When the bushing of the electronic dial indicator rotates to a position in the radial direction of the flywheel housing, it triggers the contact switch to stop the servo motor.

[0016] Preferably, a hollow extension rod is coaxially disposed on the bushing of the electronic dial indicator, and a core rod is slidably inserted into the hollow extension rod. The measuring rod of the electronic dial indicator is connected to the leak detection head through the core rod.

[0017] The advantages of this invention are:

[0018] 1. This invention uses a rotary drive mechanism to drive a leak detection head, one end of which is connected to a stop runout detection mechanism, to slide along the inner wall of the stop on the flywheel housing. The stop runout detection mechanism is used to detect the quality of the stop on the flywheel housing during sealing testing, thereby eliminating the potential for negative impacts on the assembly and sealing performance of the flywheel housing caused by substandard stop processing quality.

[0019] 2. The present invention uses a pressure sensing element on the leak detection head to detect changes in the flow rate or pressure of gas in the airflow channel. The airflow channel can connect with the leak point when the leak detection head passes through the leak point, so as to determine the location of the leak point in the flywheel housing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the hollow extension rod of the present invention.

[0022] Figure 3 This is a schematic diagram of the air pressure sensing element for a hollow extension rod.

[0023] Figure 4 This is a schematic diagram of the leak detection head of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the elastic rubber sealing column of the present invention.

[0025] The labels in the diagram represent the following:

[0026] 1-Detection platform; 2-Hollow extension rod; 3-Rotary drive mechanism; 4-Core rod; 5-Stop profile runout detection mechanism; 6-Leak detection head; 7-Airflow channel; 8-Air pressure sensing element; 9-Rectangular hole; 10-Solder ball; 11-Insulated wire; 12-Annular groove; 13-Rotating tray; 14-Servo motor; 15-Contact switch; 16-Elastic rubber sealing post;

[0027] 301 - Circular electric rail; 302 - Slider;

[0028] 501 - Electronic dial indicator; 502 - Signal transmission module;

[0029] 601 - Perforated top plate; 602 - Strip side plate;

[0030] 801 - Elastic insulating film; 802 - Conductive wire. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] like Figures 1 to 5 As shown, a testing device for flywheel housing processing includes a testing platform 1, a hollow extension rod 2, a rotary drive mechanism 3, a core rod 4, a stop profile runout testing mechanism 5, and a leak detection head 6. One end of the hollow extension rod 2 is horizontally rotatably mounted on the testing platform 1 via the rotary drive mechanism 3. A core hole is provided inside the hollow extension rod 2, penetrating both ends of it. The core rod 4 is inserted into the core hole. One end of the core rod 4 is connected to the stop profile runout testing mechanism 5, and the core rod 4 is pushed by the stop profile runout testing mechanism 5 with elastic force to abut against the inside of the stop of the flywheel housing.

[0033] The flywheel housing shaft is aligned coaxially with the rotation axis of the hollow extension rod 2. When the hollow extension rod 2 is driven to rotate once by the rotation drive mechanism 3, the core rod 4 slides once along the stop side wall of the flywheel housing, so that the stop profile runout detection mechanism 5 records the detailed data of the flywheel housing stop.

[0034] Furthermore, a leak detection head 6 is provided at one end of the core rod 4. The leak detection head 6 has an airflow channel 7 that runs through both ends of it for leaking gas to pass through. The leak detection head 6 is provided with a pressure sensing element 8 for detecting the gas pressure or gas flow rate in the airflow channel 7. The detection platform 1 is provided with a capacitance detection unit that is electrically connected to the pressure sensing element 8. When the leak detection head 6 passes through the leak location, airflow passes through the airflow channel 7. The pressure sensing element 8 detects the change in gas flow rate or gas pressure in the airflow channel 7. The capacitance detection unit records the detection data sent by the pressure sensing element 8 to analyze the leak location.

[0035] The stop profile runout detection mechanism 5 includes an electronic dial indicator 501, a signal transmission module 502, and a signal processing terminal connected in sequence. The core rod 4 is connected to the electronic dial indicator 501, which provides elastic support to the core rod 4 in the horizontal direction. The detection data of the electronic dial indicator 501 is sent to the signal processing terminal for recording via the signal transmission module 502. When the stop quality meets the standard, the dimension of the stop sidewall profile detected by the electronic dial indicator 501, i.e., the distance from the stop sidewall profile to the axis of the hollow extension rod 2, should be the same, or the runout amplitude should be within the allowable error range. Otherwise, the stop quality is judged to be substandard, which may affect the subsequent sealing and assembly of the flywheel housing.

[0036] The leak detection head 6 has a rectangular hole 9 through which the airflow channel 7 is connected. The air pressure sensing element 8 includes an elastic insulating film 801 and two conductive wires 802. The two conductive wires 802 are arranged at intervals and parallel to each other in the elastic insulating film 801. The two sides of the elastic insulating film 801 and the conductive wires 802 are respectively arranged on the inner walls of the two sides of the rectangular hole 9. The same end of the two conductive wires 802 is electrically connected through a solder ball 10. The elastic insulating film 801 and the two conductive wires 802 form a microcapacitor. The solder ball 10 is electrically connected to the capacitance detection unit with capacitance detection function through an insulating wire 11.

[0037] The above-described embodiment of the pressure sensing element 8 composed of an elastic insulating film 801 and two conductive wires 802 has the advantage of small thickness, which allows it to adapt to a smaller stop height and reduces the cross-sectional area of ​​the airflow channel 7, thereby enhancing the sensitivity of the elastic insulating film 801 to the airflow rate and pressure in the airflow channel 7.

[0038] Preferably, the solder ball 10 is suspended or bonded to the end of the elastic insulating film 801 and located between the two sides of the elastic insulating film 801, and spaced apart from the inner wall of the rectangular hole 9, so as to avoid negatively affecting the deformation and recovery of the elastic insulating film 801.

[0039] The rotary drive mechanism 3 includes an annular electric rail 301 and a slider 302 driven by the annular electric rail 301. An electronic dial indicator 501 is mounted on the slider 302. The detection platform 1 is provided with an annular groove 12 for the annular electric rail 301 and the slider 302 to be embedded. The detection platform 1 is also provided with an elastic rubber sealing post 16 located at the axial center of the annular electric rail (301) for sealing the shaft hole on the flywheel housing. When the flywheel housing is positioned on the detection platform 1, the elastic rubber sealing post 16 abuts against and seals against the housing at the edge of the shaft hole on the flywheel housing, thereby simplifying the operation process of the flywheel housing sealing test.

[0040] In addition, the electronic dial indicator 501 is rotatably mounted on the slider 302 via the rotating tray 13. The slider 302 is equipped with a servo motor 14 that is connected to the rotating tray 13 for transmission. Furthermore, the slider 302 is equipped with a contact switch 15 that is electrically connected to the servo motor 14. When the bushing of the electronic dial indicator 501 rotates to the radial position of the flywheel housing, it triggers the contact switch 15 to stop the servo motor 14.

[0041] After the flywheel housing is positioned on the detection platform 1 and coaxial with the annular electric rail 301, the servo motor 14 drives the rotating tray 13 to rotate, so that the electronic dial indicator 501 rotates. When the bushing of the electronic dial indicator 501 rotates to trigger the contact switch 15 on the slider, it is determined that the leakage detection head 6 is in contact with the stop side wall of the flywheel housing, thereby controlling the servo motor 14 to stop.

[0042] The arrangement of the rotating tray 13, servo motor 14 and contact switch 15 solves the problem of inconvenience caused by moving the leakage detection head 6 in the direction of the electronic dial indicator 501 when the flywheel housing is positioned on the detection platform 1 in order to avoid the flywheel housing pressing down on the leakage detection head 6.

[0043] Furthermore, a hollow extension rod 2 is coaxially mounted on the bushing of the electronic dial indicator 501, and a core rod 4 is slidably inserted into the hollow extension rod 2. The measuring rod of the electronic dial indicator 501 is connected to the leak detection head 6 through the core rod 4 to accommodate flywheel housings with different inner diameters.

[0044] A digital multimeter with a capacitance range can be used to easily measure the capacitance and determine its quality. The capacitance detection unit can be an embodiment that includes a capacitance detection module and a data transmission module electrically connected to it. Both the data transmission module and the ring rail 301 can be electrically connected to a signal processing terminal to obtain the location of the stop defect and leakage point of the flywheel housing based on the position of the leak detection head 6.

[0045] It should be noted that, considering that the dielectric of the microcapacitor between the two conductive wires 802 may switch from the elastic insulating film 801 to air when the elastic insulating film 801 is deformed, according to the capacitance calculation formula, the capacitance increases when the dielectric constant of the dielectric between the two conductive wires 802 increases, and vice versa. Therefore, in order for the capacitance detection unit to detect the capacitance change more clearly when the elastic insulating film 801 is deformed, i.e. when airflow passes through the airflow channel 7, the elastic insulating film 801 should be made of a material with a dielectric constant lower than that of air.

[0046] The leak detection head 6 includes an opening top plate 601 with a rectangular hole 9 and strip-shaped side plates 602 on both sides of the bottom of the opening top plate 601. An airflow channel 7 is formed between the opening top plate 601 and the two strip-shaped side plates 602, that is, the airflow channel 7 penetrates the bottom of the leak detection head 6. This facilitates the formation of an airflow channel 7 for smooth airflow in the internal space, while reducing the thickness of the leak detection head 6 to accommodate a smaller stop height. This allows the leak detection head 6 to adapt to and move along a stop with a smaller insertion height. Furthermore, the end of the opening top plate 601 that contacts the stop sidewall is arc-shaped, so that the opening top plate 601 improves the sensitivity of runout detection by making point contact with the stop sidewall.

[0047] The working principle of this invention is as follows:

[0048] The edge of the flywheel housing is pressed tightly onto the testing platform 1 to form a seal between the edge of the flywheel housing and the testing platform 1. Then, the airtightness is tested by pumping gas into or extracting gas from the flywheel housing and detecting changes in the gas pressure inside the flywheel housing. After the pumping of gas into the flywheel housing stops or the extraction of gas from the flywheel housing ceases, i.e., during the waiting phase of the gas tightness test, the servo motor 14 drives the rotating tray 13 to slowly rotate the electronic dial indicator 501 and the hollow extension rod 2 on the rotating tray 13 until the contact switch 15 is triggered. At this time, the leak detection head 6 contacts the side of the flywheel housing stop. Then, the annular rail 301 drives the slider 302, which is equipped with the servo motor 14, the rotating tray 13 and the contact switch 15, to move along the annular groove 12 coaxial with the flywheel housing to detect the side wall of the flywheel housing stop. If the stop quality is substandard, such as if the runout detected by the electronic dial indicator 501 exceeds the allowable error, it is determined that the thickness at a certain point of the stop is substandard. When the stop thickness is too large or too small, it will have a negative impact on the assembly and sealing of the flywheel housing, respectively.

[0049] Furthermore, when the leak detection head 6 passes the leak point, that is, when the airflow channel 7 is connected to the leak point, airflow will flow through the airflow channel 7, causing the air pressure in the airflow channel 7 to change. This causes the elastic insulating film 801 to deform, and the distance between the two conductive wires 802 to change. According to the capacitance calculation formula, when the distance between the two conductive wires 802 decreases, the capacitance will increase, and vice versa. The capacitance detection unit detects the capacitance, and when the capacitance changes abnormally, it determines that there is an air leak at the corresponding position of the flywheel housing.

[0050] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A testing device for flywheel housing processing, characterized in that, The system includes a detection platform (1), a rotary drive mechanism (3), a leak detection head (6), and a stop profile runout detection mechanism (5). The leak detection head (6) is horizontally rotated on the detection platform (1) via the rotary drive mechanism (3). One end of the leak detection head (6) is connected to the stop profile runout detection mechanism (5), and the other end of the leak detection head (6) abuts against the side wall of the stop on the flywheel housing under the push of the stop profile runout detection mechanism (5). The rotation axis of the leak detection head (6) is coaxial with the axis of the flywheel housing. The leak detection head (6) has an airflow channel (7) that runs through both ends of it for leaked gas to pass through. The leak detection head (6) is provided with a pressure sensing element (8) for detecting the pressure or flow rate of the gas in the airflow channel (7). The detection platform (1) is provided with a capacitance detection unit that is electrically connected to the pressure sensing element (8). The stop profile runout detection mechanism (5) includes an electronic dial indicator (501), a signal transmission module (502), and a signal processing terminal connected in sequence. The leak detection head (6) is connected to the electronic dial indicator (501). The detection data of the electronic dial indicator (501) is sent to the signal processing terminal for recording by means of the signal transmission module (502). The leak detection head (6) has a rectangular hole (9) that connects to the airflow channel (7). The pressure sensing element (8) includes an elastic insulating film (801) and two conductive wires (802). The two conductive wires (802) are arranged in the elastic insulating film (801) at intervals and parallel to each other. The two sides of the elastic insulating film (801) and the conductive wires (802) are respectively arranged on the inner walls of the two sides of the rectangular hole (9). The same end of the two conductive wires (802) is electrically connected through a solder ball (10). The elastic insulating film (801) and the two conductive wires (802) form a microcapacitor. The solder ball (10) is electrically connected to the capacitance detection unit with capacitance detection function through the insulating wire (11) and the signal transmission module (502) in sequence.

2. The testing device for flywheel housing processing according to claim 1, characterized in that, The dielectric constant of the elastic insulating film (801) is less than that of air.

3. The testing device for flywheel housing processing according to claim 1, characterized in that, The solder ball (10) is attached to the end of the elastic insulating film (801) and located between the two sides of the elastic insulating film (801), and the solder ball (10) is spaced from the inner wall of the rectangular hole (9). The insulating wire (11) is reserved with a slack for the solder ball (10) to move with the deformation of the elastic insulating film (801).

4. The testing device for flywheel housing processing according to claim 1, characterized in that, The leak detection head (6) includes an opening top plate (601) with a rectangular hole (9) and strip side plates (602) on both sides of the bottom of the opening top plate (601). An airflow channel (7) is formed between the opening top plate (601) and the strip side plates (602) on both sides. The end of the opening top plate (601) that is used to contact the stop side wall is arc-shaped, so that the opening top plate (601) can improve the sensitivity of the runout detection by contacting the stop side wall.

5. The testing device for flywheel housing processing according to claim 1, characterized in that, The rotary drive mechanism (3) includes an annular electric rail (301) and a slider (302) driven by the annular electric rail (301). The electronic dial indicator (501) is disposed on the slider (302). The detection platform (1) is provided with an annular groove (12) for the annular electric rail (301) and the slider (302) to be embedded. The detection platform (1) is provided with an elastic rubber sealing post (16) located at the axial position of the annular electric rail (301) for sealing the shaft hole on the flywheel housing.

6. The testing device for flywheel housing processing according to claim 5, characterized in that, The electronic dial indicator (501) is rotatably mounted on the slider (302) via a rotating tray (13).

7. The testing device for flywheel housing processing according to claim 6, characterized in that, The slider (302) is provided with a servo motor (14) that is connected to the rotating tray (13) for transmission, and the slider (302) is provided with a contact switch (15) that is electrically connected to the servo motor (14). When the bushing of the electronic dial indicator (501) rotates to the radial position of the flywheel housing, it triggers the contact switch (15) to stop the servo motor (14).

8. The testing device for flywheel housing processing according to claim 5, characterized in that, A hollow extension rod (2) is coaxially arranged on the bushing of the electronic dial indicator (501). A core rod (4) is slidably inserted into the hollow extension rod (2). The measuring rod of the electronic dial indicator (501) is connected to the leak detection head (6) through the core rod (4).

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