Gearbox body air tightness detection device and air tightness detection system

Abstract

The invention discloses an air tightness detection device and an air tightness detection system for a gearbox body, and belongs to the technical field of gearbox detection, the air tightness detection device comprises an inner blowing pipe, an outer inflation pipe arranged on the outer side of the inner blowing pipe and a sealing sleeve installed on the outer side of the outer inflation pipe, and the inner blowing pipe and the outer inflation pipe are separated to form an inflation cavity; the inflation cavity is connected with inflation equipment and a pressure sensor; the inner air blowing pipe comprises a first pipe body, a first flexible transition pipe, a second pipe body, a second flexible transition pipe and a third pipe body which are sequentially and hermetically communicated from the tail end to the head part in a rotating manner, and a first rotating driving device for controlling the first flexible transition pipe to rotate is mounted on the first pipe body; the first flexible transition pipe is provided with a second rotation driving device for controlling the second pipe body to rotate, and the second flexible transition pipe is provided with a third rotation driving device for controlling the third pipe body. Impurities can be blown away before airtightness detection, and the problem that the detection result is inaccurate due to the fact that air holes or air gaps are blocked by the impurities is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of gearbox detection, and in particular relates to an air tightness detection device and an air tightness detection system for a gearbox case. Background Art

[0002] The gearbox case is an important part of the mechanical power unit. It needs to be tested for air tightness after production and processing. The air tightness test is mainly to detect whether the case has defects, so as to reflect whether there is oil leakage during later use. The existing practice is to completely block all the holes on the gearbox case, and then use the air tightness test device to inflate the tested cavity for air tightness test. Because the air holes or air gaps on the inside of the gearbox case are easily blocked by impurities or other defects, there are certain differences in the air tightness test results. Summary of the invention

[0003] In view of this, an object of the present invention is to provide an air tightness detection device and an air tightness detection system for a gearbox casing, which can blow away impurities before air tightness detection to avoid the problem of inaccurate detection results caused by impurities blocking air holes or air gaps.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses an air tightness detection device for a gearbox case, comprising an inner air blowing pipe, an outer air filling pipe arranged on the outer side of the inner air blowing pipe, and a sealing sleeve installed on the outer side of the outer air filling pipe, wherein an air filling cavity is formed between the inner air blowing pipe and the outer air filling pipe, the tail end of the inner air blowing pipe is connected with an air blowing device, and the air filling cavity is connected with an air filling device and a pressure sensor; the inner air blowing pipe comprises a first tube body, a first flexible transition tube, a second tube body, a second flexible transition tube and a third tube body which are sequentially connected and rotated and sealed from the tail end to the head, a first rotation driving device for controlling the rotation of the first flexible transition tube is installed on the first tube body, a second rotation driving device for controlling the rotation of the second tube body is installed on the first flexible transition tube, and a third rotation driving device for controlling the third tube body is installed on the second flexible transition tube.

[0006] Further, the first rotation drive device includes a first support plate, a first motor, a first gear, and a first ring gear. The first support plate is fixed to the outside of the first tube body, the first motor is fixed to the first support plate, the output end of the first motor is connected to the first gear, the first gear is meshed with the first ring gear, and the first ring gear is fixed to the outside of the first flexible transition tube.

[0007] Furthermore, the second rotation drive device includes a second support plate, a second motor, a second gear, and a second gear ring. The second support plate is fixed to the outside of the first flexible transition tube, the second motor is fixed to the second support plate, the output end of the second motor is connected to the second gear, the second gear is meshed with the second gear ring, and the second gear ring is fixed to the outside of the second tube body.

[0008] Furthermore, the third rotation drive device includes a third support plate, a third motor, a third gear, and a third gear ring. The third support plate is fixed to the outside of the second flexible transition tube, the third motor is fixed to the third support plate, the output end of the third motor is connected to the third gear, the third gear is meshed with the third gear ring, and the third gear ring is fixed to the outside of the third tube body.

[0009] Furthermore, a first telescopic device is installed at one end of the first flexible transition section, an output end of the first telescopic device is connected to the other end of the first flexible transition section, and the first telescopic device is installed on the side away from the second rotation drive device.

[0010] Furthermore, a second telescopic device is installed at one end of the second flexible transition section, an output end of the second telescopic device is connected to the other end of the second flexible transition section, and the second telescopic device is installed on the side away from the third rotation drive device.

[0011] Furthermore, a rack is fixed on the inner side of the outer inflation tube, a fourth motor is fixed on the outer side of the first tube body, an output end of the fourth motor is connected to a fourth gear, and the fourth gear is meshed with the rack.

[0012] A gearbox case air tightness detection system comprises an air tightness detection device as described in any one of the above items, and also comprises a gearbox case and a clamp for clamping the gearbox case, a sealing ring is installed in the detection hole of the gearbox case, the inflation ends of the inner air blowing pipe and the outer inflation pipe extend into the gearbox case, and the sealing ring cooperates with the sealing sleeve.

[0013] The beneficial effects of the present invention are:

[0014] The present invention discloses an air tightness detection device for a gearbox case. By simultaneously arranging an inner air blowing pipe, the inner side of the gearbox case can be sprayed at any time before or during the inflation of the gearbox case, thereby blowing away impurities inside the gearbox case, thereby preventing the impurities from blocking the air holes or air gaps inside the gearbox case, resulting in inaccurate air tightness detection results.

[0015] In the device disclosed in the present invention, by setting the outer inflation tube outside the inner blowing tube, there is no need to set a separate installation hole for the inner blowing tube, which not only facilitates inflation and installation, but also increases stability during detection due to the reduction of separately opened holes.

[0016] The air tightness detection device disclosed in the present invention can set the angles between the first tube body, the second tube body and the third tube body in advance, and then install the gearbox case. The angle of the second tube body can be adjusted by the second rotation drive device, thereby adjusting the spraying angle over a wide range. The third rotation drive device can adjust the spraying angle of the third tube body over a wide range, thereby realizing the spraying treatment of impurities at different positions.

[0017] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a structural schematic diagram of the air tightness detection device of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the inner air blowing pipe of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the rack;

[0022] Figure 4 is a cross-sectional view of an airtightness detection device;

[0023] Figure 5 It is a structural diagram of the airtightness detection system.

[0024] The markings in the accompanying drawings are as follows: inner air blowing tube 1, outer inflation tube 2, sealing sleeve 3, inflation chamber 4, first tube body 5, first flexible transition tube 6, second tube body 7, second flexible transition tube 8, third tube body 9, first support plate 10, first motor 11, first gear 12, first ring gear 13, second support plate 14, second motor 15, second gear 16, second ring gear 17, third support plate 18, third motor 19, third gear 20, third ring gear 21, first telescopic device 22, second telescopic device 23, rack 24, fourth motor 25, fourth gear 26, gearbox case 27, fixture 28, detection hole 29, sealing ring 30. DETAILED DESCRIPTION

[0025] like Figures 1 to 4 As shown, the present invention discloses a gearbox case air tightness detection device, comprising an inner air blowing pipe 1, an outer air filling pipe 2 arranged outside the inner air blowing pipe 1, and a sealing sleeve 3 installed outside the outer air filling pipe 2, wherein the sealing sleeve 3 is used to be connected with the detection hole 29 of the gearbox case 27, the inner air blowing pipe 1 extends into the case for blowing, and the outer air filling pipe 2 is used for inflation. Before or during inflation of the gearbox case 27, the inner side of the gearbox case 27 can be blown at any time, so that the impurities inside the gearbox case 27 can be blown away, and the impurities are prevented from blocking the air holes or air gaps inside the gearbox case 27, resulting in inaccurate air tightness detection results.

[0026] Specifically, an inflation chamber 4 is formed between the inner air blowing tube 1 and the outer air filling tube 2. The tail end of the inner air blowing tube 1 is connected to a blowing device, which can provide high-pressure gas, thereby forcefully blowing away impurities. The inflation chamber 4 is connected to an inflation device and a pressure sensor. The inner side of the gearbox case 27 is inflated by the inflation device. After the inflation is stopped, the pressure change is sensed by the pressure sensor to determine whether there is a gas leakage.

[0027] The inner air blowing pipe 1 includes a first tube body 5, a first flexible transition tube 6, a second tube body 7, a second flexible transition tube 8 and a third tube body 9 which are rotatably sealed and connected in sequence from the tail end to the head, that is, the outer end of the first tube body 5 is rotatably sealed and matched with the tail end of the first flexible transition tube 6, the outer end of the first flexible transition tube 6 is rotatably sealed and matched with the tail end of the second tube body 7, the outer end of the second tube body 7 is rotatably sealed and matched with the tail end of the second flexible transition tube 8, the outer end of the second flexible transition tube 8 is rotatably sealed and matched with the tail end of the third tube body 9, and the outer end of the third tube body 9 is freely extended outward, and the blowing angle can be automatically changed according to actual needs.

[0028] In the present invention, the outer inflation tube 2 is coaxial with the first tube body 5, and the inner blowing tube 1 can be moved axially relative to the outer inflation tube 2. The inner blowing tube 1 can also be controlled to extend into the gearbox housing 27 in an artificially controlled manner. A first rotation drive device for controlling the rotation of the first flexible transition tube 6 is installed on the first tube body 5. The first rotation drive device can drive the first flexible transition tube 6 and each tube body connected to the tail end of the first flexible transition tube 6 to rotate integrally to control the rotation angle. A second rotation drive device for controlling the rotation of the second tube body 7 is installed on the first flexible transition tube 6. The second rotation drive device can drive the second tube body 7 and each tube body connected to the tail end of the second tube body 7 to rotate integrally to control the rotation angle. A third rotation drive device for controlling the third tube body 9 is installed on the second flexible transition tube 8. The third rotation drive device can independently control the rotation angle of the third tube body 9, thereby achieving precise control of the final blowing position.

[0029] In the device disclosed in the present invention, the angles among the first tube body 5, the second tube body 7 and the third tube body 9 can be set in advance, and then the gearbox housing 27 can be installed. By setting three rotating drive devices, the impurities at different positions can be sprayed.

[0030] In some other embodiments, the three rotation drive devices may all use a servo, but the angle control method using the servo is limited and cannot be well coordinated with the axial rotation method in the tube body.

[0031] In this embodiment, the first rotation driving device includes a first support plate 10, a first motor 11, a first gear 12, and a first gear ring 13. The first support plate 10 is fixed to the outside of the first tube body 5. The first tube body 5 adopts a rigid straight tube. The first motor 11 will not move. The first motor 11 is fixed to the first support plate 10. The output end of the first motor 11 is connected to the first gear 12. The first gear 12 is meshed with the first gear ring 13. The first gear ring 13 is fixed to the outside of the first flexible transition tube 6. When in use, after the first motor 11 rotates, it can drive the first gear 12 to rotate. The first gear 12 drives the first gear ring 13 meshed with it to rotate, and the first gear ring 13 drives the first flexible transition tube 6 to rotate as a whole.

[0032] Similarly, the second rotation driving device includes a second support plate 14, a second motor 15, a second gear 16, and a second gear ring 17. The second support plate 14 is fixed to the outside of the first flexible transition tube 6, the second motor 15 is fixed to the second support plate 14, the output end of the second motor 15 is connected to the second gear 16, the second gear 16 is meshed with the second gear ring 17, and the second gear ring 17 is fixed to the outside of the second tube body 7. When in use, after the second motor 15 rotates, it can drive the second gear 16 to rotate, the second gear 16 drives the second gear ring 17 meshed therewith to rotate, and the second gear ring 17 drives the second tube body 7 to rotate as a whole.

[0033] Similarly, the third rotation driving device includes a third support plate 18, a third motor 19, a third gear 20, and a third gear ring 21. The third support plate 18 is fixed to the outside of the second flexible transition tube 8, the third motor 19 is fixed to the third support plate 18, the output end of the third motor 19 is connected to the third gear 20, the third gear 20 is meshed with the third gear ring 21, and the third gear ring 21 is fixed to the outside of the third tube body 9. When in use, after the third motor 19 rotates, it can drive the third gear 20 to rotate, the third gear 20 drives the third gear ring 21 meshed with it to rotate, and the third gear ring 21 drives the third tube body 9 to rotate as a whole.

[0034] In this embodiment, a first telescopic device 22 is installed at one end of the first flexible transition section, and the output end of the first telescopic device 22 is connected to the other end of the first flexible transition section. The first telescopic device 22 is installed on the side away from the second rotation drive device. The first telescopic device 22 can drive one side of the first flexible transition section to stretch and deform it, thereby allowing the second tube body 7 and the first tube body 5 to be separated by a certain angle, so that the outer end of the third tube body 9 can be closer to the inner wall of the gearbox housing 27, which is more convenient for cleaning impurities. Of course, after use, the first telescopic device 22 can be retracted to the initial state, so that the second tube body 7 and the first tube body 5 remain coaxial, which is convenient for inserting or pulling out the tube body from the gearbox housing 27.

[0035] Similarly, a second telescopic device 23 is installed at one end of the second flexible transition section, the output end of the second telescopic device 23 is connected to the other end of the second flexible transition section, and the second telescopic device 23 is installed on the side away from the third rotation drive device. By providing the second telescopic device 23, the angle of the third tube body 9 can be changed to a certain extent, and the degree of freedom of change is higher.

[0036] In this embodiment, a rack 24 is fixed to the inner side of the outer inflation tube 2, a fourth motor 25 is fixed to the outer side of the first tube body 5, and the output end of the fourth motor 25 is connected to the fourth gear 26, which meshes with the rack 24. By providing the fourth motor 25, the inner blowing tube 1 can be moved axially relative to the outer inflation tube 2, so as to spray at different axial positions in the gearbox housing 27, meet the actual spraying needs, and clean more thoroughly.

[0037] like Figure 5 As shown, the present invention discloses an air tightness detection system for a gearbox case, comprising any of the air tightness detection devices described above, and further comprising a gearbox case 27 and a fixture 28 for clamping the gearbox case 27, a sealing ring 30 is installed in the monitoring hole of the gearbox case 27, the inflation ends of the inner air blowing pipe 1 and the outer inflation pipe 2 extend into the gearbox case 27, the sealing ring 30 cooperates with the sealing sleeve 3, and the gearbox case 27 is fixed by setting the fixture 28, so as to improve the accuracy of the air tightness detection.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A gearbox housing air tightness detection device, characterized in that: It includes an inner air blowing pipe, an outer inflation pipe arranged on the outside of the inner air blowing pipe, and a sealing sleeve installed on the outside of the outer inflation pipe, wherein an inflation cavity is formed between the inner air blowing pipe and the outer inflation pipe, the tail end of the inner air blowing pipe is connected with an air blowing device, and the inflation cavity is connected with an inflation device and a pressure sensor; the inner air blowing pipe includes a first tube body, a first flexible transition tube, a second tube body, a second flexible transition tube and a third tube body which are rotatably and sealedly connected in sequence from the tail end to the head, a first rotation driving device for controlling the rotation of the first flexible transition tube is installed on the first tube body, a second rotation driving device for controlling the rotation of the second tube body is installed on the first flexible transition tube, and a third rotation driving device for controlling the third tube body is installed on the second flexible transition tube.

2. The air tightness detection device for a gearbox housing according to claim 1, characterized in that: The first rotation driving device includes a first support plate, a first motor, a first gear, and a first gear ring. The first support plate is fixed to the outside of the first tube body, the first motor is fixed to the first support plate, the output end of the first motor is connected to the first gear, the first gear is meshed with the first gear ring, and the first gear ring is fixed to the outside of the first flexible transition tube.

3. The air tightness detection device for a gearbox housing according to claim 2, characterized in that: The second rotation driving device includes a second support plate, a second motor, a second gear, and a second gear ring. The second support plate is fixed to the outside of the first flexible transition tube, the second motor is fixed to the second support plate, the output end of the second motor is connected to the second gear, the second gear is meshed with the second gear ring, and the second gear ring is fixed to the outside of the second tube body.

4. The air tightness detection device for a gearbox housing according to claim 3, characterized in that: The third rotation driving device includes a third support plate, a third motor, a third gear, and a third gear ring. The third support plate is fixed to the outside of the second flexible transition tube. The third motor is fixed to the third support plate. The output end of the third motor is connected to the third gear. The third gear is meshed with the third gear ring. The third gear ring is fixed to the outside of the third tube body.

5. The air tightness detection device for a gearbox housing according to any one of claims 1 to 4, characterized in that: A first telescopic device is installed at one end of the first flexible transition section, an output end of the first telescopic device is connected to the other end of the first flexible transition section, and the first telescopic device is installed on the side away from the second rotation drive device.

6. The air tightness detection device for a gearbox housing according to claim 5, characterized in that: A second telescopic device is installed at one end of the second flexible transition section, an output end of the second telescopic device is connected to the other end of the second flexible transition section, and the second telescopic device is installed on the side away from the third rotation drive device.

7. The air tightness detection device for a gearbox housing according to claim 1, characterized in that: A rack is fixed on the inner side of the outer inflation tube, a fourth motor is fixed on the outer side of the first tube body, an output end of the fourth motor is connected to a fourth gear, and the fourth gear is meshed with the rack.

8. A gearbox housing air tightness detection system, characterized in that: It includes the air tightness detection device as described in any one of claims 1 to 7, and also includes a gearbox case and a clamp for clamping the gearbox case, a sealing ring is installed in the detection hole of the gearbox case, the inflation ends of the inner blowing pipe and the outer inflation pipe extend into the gearbox case, and the sealing ring cooperates with the sealing sleeve.

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