A gearbox air tightness testing device

Abstract

The present invention relates to the field of air tightness testing, and in particular to a gearbox air tightness testing device, comprising a base, an isolation barrel, a top cover, and a first air pipe; the base is fixedly connected to an isolation barrel, and the isolation barrel is provided with a plurality of observation windows for observing the condition of the gearbox; the isolation barrel is mounted with a top cover, and the top cover is penetrated by a first air pipe, and the first air pipe is a hose. The present invention is in a closed state for a long time due to the base, the isolation barrel, and the top cover, and the amount of dust inside is relatively small, that is, during the process of spraying soapy water, a large amount of dust will not be attached to the gearbox. It should be noted that soapy water has a low surface tension and is easy to form bubbles. However, dust particles will adhere to the liquid surface, interfering with the uniform distribution of surface tension, making it difficult for bubbles to form stably. That is, the mixing of dust particles and soapy water will affect the formation of bubbles, thereby affecting the subsequent judgment of leaks through bubbles.

Description

Technical Field

[0001] The present invention relates to the field of air tightness detection, and in particular to a gearbox air tightness detection device. Background Art

[0002] The gearbox housing is an important component in a car. Its function is to provide an installation space for the gear transmission mechanism. The housing is mainly composed of an upper shell and a lower shell. Since lubricating oil needs to be added to the gearbox to lubricate the gears, there are strict requirements on the sealing performance of the gearbox. In the existing technology, when testing the sealing performance of the gearbox, although the gearbox has a certain waterproof ability, it is not absolutely waterproof. It should be avoided to directly immerse the gearbox in water for testing. The common method is to inflate the housing and apply soapy water to the outside to observe whether bubbles are generated, so as to determine whether there is a leak. In this process, soapy water is generally sprayed evenly on the surface of the gearbox using a spray bottle. However, it is worth noting that soapy water will mix with external dust. It should be noted that soapy water has a low surface tension and is easy to form bubbles. However, dust particles will adhere to the liquid surface, interfering with the uniform distribution of surface tension, making it difficult for bubbles to form stably. That is, soapy water mixed with dust will affect its bubble formation, thereby affecting the detection effect. Summary of the Invention

[0003] In order to overcome the general method of using a spray bottle to evenly spray soapy water on the surface of the gearbox, however, it is worth noting that the soapy water will mix with the dust from the outside. It should be noted that the surface tension of soapy water is low and bubbles are easily formed. However, dust particles will adhere to the surface of the liquid, interfering with the uniform distribution of surface tension, making it difficult for bubbles to form stably, that is, soapy water mixed with dust will affect its bubble formation, thereby affecting the detection effect. The present invention provides a gearbox air tightness detection device.

[0004] Technical solution: A gearbox air tightness detection device, comprising a base, an isolation barrel, a top cover and a first air pipe; an isolation barrel is fixedly connected to the base, and the isolation barrel is provided with several observation windows for observing the gearbox condition; a top cover is installed on the isolation barrel, and a first air pipe is passed through the top cover, and the first air pipe is a hose; it also includes a multi-stage push rod, a first spray ring, a first connecting pipe, a sponge block, a connecting plate, a second connecting pipe and a placement rack; a plurality of multi-stage push rods are fixedly connected to the base; the telescopic ends of all the multi-stage push rods are commonly fixedly connected to the first spray ring, and the first spray ring is provided with a plurality of annular array nozzles; a plurality of first connecting pipes are passed through the isolation barrel, and the first connecting pipes are telescopic pipes; all the first connecting pipes are commonly connected to the first spray ring; a connecting plate is connected to the base; a sponge block is installed on the connecting plate; a second connecting pipe is passed through the connecting plate, and the interior of the isolation barrel is fixedly connected to a placement rack.

[0005] Optionally, a plurality of cleaning blocks are provided on the first spray ring.

[0006] Optionally, the base, sponge block and connecting plate are all configured as quick-release structures.

[0007] The multi-stage push rod optionally also includes a cleaning assembly, which includes a second spray ring and a second air pipe; the second spray ring is fixedly connected to the first spray ring; a plurality of second air pipes are passed through the isolation barrel, and the second air pipes are telescopic pipes; all the second air pipes are connected to the second spray ring.

[0008] Optionally, a detection component is also included, which includes a connecting ring and a sealing ring; the telescopic ends of all multi-stage push rods are commonly connected to the connecting ring, which is tightly attached to the first spray ring; and the sealing ring is fixedly connected to the connecting ring.

[0009] Optionally, the nozzles on the second spray ring are arranged to be inclined downward.

[0010] Optionally, the connecting ring is arranged in a ring structure that is larger at the top and smaller at the bottom.

[0011] Optionally, the sealing ring adopts a polyurethane sealing strip.

[0012] Optionally, the sealing ring is arranged in a ring structure that is larger at the top and smaller at the bottom.

[0013] Optionally, it also includes an electric push rod, a limit cover and a rubber membrane; a plurality of electric push rods are passed through the top cover; the telescopic ends of all the electric push rods are fixedly connected to the limit cover, and a blocking block is provided on the limit cover; a plurality of rubber membranes are passed through the limit cover.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention is in a closed state for a long time by the base, the isolation barrel and the top cover, so the amount of dust inside is relatively small. That is, during the process of spraying soapy water, a large amount of dust will not be attached to the gearbox. It should be noted that soapy water has a low surface tension and is easy to form bubbles. However, dust particles will adhere to the liquid surface, interfering with the uniform distribution of surface tension, making it difficult for bubbles to form stably. That is, the mixing of dust particles and soapy water will affect the formation of bubbles, thereby affecting the subsequent judgment of the leak through bubbles.

[0015] 2. In the present invention, water flows downward through the gap between the sealing ring and the gearbox housing, that is, there is water leakage in the recessed area. Since water leakage may also generate bubbles, on the one hand, it is necessary to continuously replenish soapy water with the first spray ring. On the other hand, the soapy water in the recessed area continues to move upward as the multi-stage push rod pushes it. After the recessed area passes the suspected leakage point, the surface of the suspected leakage point is covered with soapy water. The suspected leakage point is observed again to see if there are bubbles. If no bubbles are generated, the bubbles generated in the soapy water in the recessed area at the suspected leakage point are caused by water leakage. If bubbles are generated, it is determined that there is a leak at that location.

[0016] 3. The present invention covers the reserved through-hole position by a limit cover and judges through a rubber membrane. When the rubber membrane expands outward, it is judged that there is a leakage problem in the through-hole reserved for the gearbox. When a problem occurs, the staff is required to reconnect the first air pipe and the through-hole reserved for the gearbox, or reassemble the gearbox to facilitate subsequent testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the gearbox air tightness detection equipment of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the gearbox air tightness detection equipment of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a gearbox of the gearbox air tightness detection device of the present invention;

[0020] Figure 4 This is a schematic structural diagram of a cleaning assembly of a gearbox air tightness detection device according to the present invention;

[0021] Figure 5 This is a schematic structural diagram of a detection assembly of a gearbox air tightness detection device according to the present invention;

[0022] Figure 6 This is a schematic diagram of the combined structure of the electric push rod, the limit cover and the rubber membrane of the gearbox air tightness detection equipment of the present invention;

[0023] Figure 7 This is a schematic diagram of the combined structure of the electric push rod and the limit cover of the gearbox air tightness detection equipment of the present invention.

[0024] Markings in the accompanying drawings: 1-base, 2-isolation barrel, 2001-observation window, 3-top cover, 4-first air pipe, 5-multi-stage push rod, 6-first spray ring, 6001-cleaning block, 7-first connecting pipe, 8-sponge block, 9-connecting plate, 10-second connecting pipe, 11-placing rack, 101-second spray ring, 102-second air pipe, 103-connecting ring, 104-sealing ring, 201-electric push rod, 202-limiting cover, 20201-sealing block, 203-rubber membrane. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Example

[0026] A gearbox air tightness testing device, such as Figure 1-Figure 3As shown, it includes a base 1, an isolation barrel 2, a top cover 3 and a first gas pipe 4; the isolation barrel 2 is fixedly connected to the base 1, and the isolation barrel 2 is provided with four annular array observation windows 2001; the isolation barrel 2 is installed with a top cover 3, and the top cover 3 is penetrated by a first gas pipe 4, which is a hose;

[0027] It also includes a multi-stage push rod 5, a first spray ring 6, a first connecting pipe 7, a sponge block 8, a connecting plate 9, a second connecting pipe 10 and a placement rack 11; two symmetrically arranged multi-stage push rods 5 are bolted to the base 1; the telescopic ends of all the multi-stage push rods 5 are fixedly connected to the first spray ring 6, and the first spray ring 6 is provided with a plurality of annular array nozzles; two symmetrically arranged first connecting pipes 7 are passed through the isolation barrel 2, and the first connecting pipe 7 is a telescopic pipe; all the first connecting pipes 7 are connected to the first spray ring 6; a connecting plate 9 is connected to the base 1; a sponge block 8 is installed on the connecting plate 9; a second connecting pipe 10 is passed through the connecting plate 9, and the interior of the isolation barrel 2 is fixedly connected to a placement rack 11.

[0028] The first spray ring 6 is provided with four cleaning blocks 6001 in a circular array for cleaning the observation window 2001 .

[0029] The base 1 , the sponge block 8 and the connecting plate 9 are all configured as a quick-release structure, making it easy to replace the sponge block 8 .

[0030] First, the staff uses the external gas transmission equipment to connect with the first gas transmission pipe 4, and then uses the external conveying equipment to connect with the first connecting pipe 7. Then the staff opens the top cover 3, and then puts the gearbox into the isolation barrel 2, and supports the gearbox with the sponge block 8, and limits the upper end of the gearbox through the placement rack 11 to keep the gearbox in a vertical state. Then, the first gas transmission pipe 4 is connected with the through hole reserved during the gearbox assembly process, and then the top cover 3 is reinstalled back into the isolation barrel 2 and fixed. Then, the external conveying equipment is controlled to operate to inject soapy water into the first connecting pipe 7, and then the soapy water enters the first spray ring 6, and is sprayed out through the first spray ring 6 and sprayed on the gearbox. At the same time, the multi-stage push rod 5 is controlled to push the first spray ring 6 to The base 1, the isolation barrel 2 and the top cover 3 are closed for a long time, and the amount of dust inside is relatively small. In other words, a large amount of dust will not adhere to the gearbox during the spraying of soapy water. It should be noted that the surface tension of soapy water is low and bubbles are easily formed. However, dust particles will adhere to the liquid surface, interfering with the uniform distribution of surface tension, making it difficult for bubbles to form stably. In other words, the mixture of dust particles and soapy water will affect the formation of bubbles, thereby affecting the subsequent judgment of the leak through bubbles, and then controlling the peripherals. The gas transmission equipment is operated to inject gas into the first gas transmission pipe 4, and then the air flow enters the gearbox through the first gas transmission pipe 4. During this process, the staff observes whether there are bubbles at the connection of the gearbox through the observation window 2001 to determine whether there is a leakage problem in the gearbox. When the leakage hole is very small, the soapy water applied on the gearbox forms bubbles, and part of the soapy water will splash to the outside of the gearbox and drip down on the sponge block 8. The soapy water is absorbed by the sponge block 8 and absorbs part of the splashed soapy water during the spraying process. When there is a larger leakage hole, the soapy water applied on the gearbox will be driven by the ejected air flow to adhere to the observation window 2001, which is convenient for the staff to observe. After completing the inspection, the staff first opens the Open the top cover 3, then take out the gearbox, and repair the gearbox according to the test results. After taking out the gearbox, control the multi-stage push rod 5 to drive the first spray ring 6 to move up and down. The first spray ring 6 drives the cleaning block 6001 to move up and down, and wipe the soapy water attached to the observation window 2001 to facilitate the staff's secondary observation. The soapy water on the sponge block 8, some of the soapy water when the gearbox is placed, will be squeezed by the gearbox to squeeze the sponge block 8, that is, the soapy water on the sponge block 8 will be discharged through the second connecting pipe 10. After long-term use, the staff can remove the connecting plate 9 from the base 1, and at the same time, the sponge block 8 on which the connecting plate 9 is installed will be separated from the base 1, and the sponge block 8 will be replaced to avoid excessive accumulation of soapy water affecting subsequent test results. Example

[0031] On the basis of the above embodiment 1, Figure 3-Figure 5 As shown, a cleaning component is also included, which includes a second spray ring 101 and a second air pipe 102; the second spray ring 101 is fixedly connected to the first spray ring 6; two symmetrically arranged second air pipes 102 are passed through the isolation barrel 2, and the second air pipes 102 are telescopic pipes; all the second air pipes 102 are connected to the second spray ring 101.

[0032] It also includes a detection component, which includes a connecting ring 103 and a sealing ring 104; the telescopic ends of all the multi-stage push rods 5 are commonly connected to the connecting ring 103, and the connecting ring 103 is tightly attached to the first spray ring 6; the sealing ring 104 is fixedly connected to the connecting ring 103.

[0033] The nozzles on the second spray ring 101 are arranged to be tilted downward, so as to facilitate cleaning of soapy water on the gearbox.

[0034] The connecting ring 103 is provided in a ring structure with a larger upper portion and a smaller lower portion, and is used for guiding soapy water.

[0035] The sealing ring 104 is made of a polyurethane sealing strip and is used to fit the outer shell of the gearbox.

[0036] The sealing ring 104 is provided in a ring structure with a larger upper portion and a smaller lower portion, and is used for filling soapy water.

[0037] In the above-mentioned process of injecting air flow into the gearbox through the first air pipe 4 to detect the air tightness, although the base 1, the isolation barrel 2 and the top cover 3 can isolate the external dust and reduce the contact between dust and soapy water, it is unavoidable that a small amount of dust adheres to the gearbox, affecting the soapy water on the gearbox surface to generate bubbles. For tiny leaks, the bubbles generated are small, and the dust interferes with the generation of bubbles, making it even more difficult to observe the leakage there. In addition, soapy water is sprayed on the gearbox casing in a spraying manner. Since the sprayed soapy water contacts the air in the isolation barrel 2, part of the air is easily mixed and attached to the gearbox casing to directly generate bubbles, which interferes with the judgment of the air tightness detection. At the same time, due to the irregularity of the gearbox casing, the sprayed soapy water is difficult to perfectly cover the connection of the gearbox, resulting in missed detection. Therefore, when the gearbox casing is as follows Figure 3After the gearbox shown is placed in the isolation barrel 2, when the multi-stage push rod 5 pushes the first spray ring 6 upward, the multi-stage push rod 5 simultaneously drives the connecting ring 103 to move upward, and the connecting ring 103 drives the blocking ring 104 to move upward, so that the blocking ring 104 is close to the outer shell of the gearbox. In this process, a downwardly concave groove is formed between the blocking ring 104 and the gearbox shell. The pressure of the soapy water sprayed is reduced by controlling the first spray ring 6. At the same time, since the first spray ring 6 is in close contact with the connecting ring 103, the soapy water flows along the surface of the connecting ring 103, that is, the soapy water is filled in the concave area to reduce the amount of air driven by the sprayed soapy water into the concave area, reduce the generation of bubbles in the soapy water in the concave area, and avoid the generation of a large number of bubbles affecting the judgment of the air tightness test. At the same time, the soapy water in the concave area can flow naturally and contact various parts of the gearbox shell. Compared with the spraying method, the natural flow method can avoid the splashing of soapy water, prevent the soapy water from splashing on the observation window 2001 and affecting the observation, and at the same time, the flowing soapy water can better cover the surface of the gearbox shell. , to avoid the problem of missed detection caused by inadequate spraying of soapy water, under the push of the multi-stage push rod 5, the soapy water in the recessed area gradually moves upwards, and the staff first observes whether there are bubbles in the soapy water in the recessed area. If continuous bubbling occurs in the soapy water in the recessed area, it is judged that there is a suspicion of leakage at that position of the gearbox. Since the gearbox housing structure is irregular and is not a smooth and complete cylinder, that is, the sealing ring 104 cannot always maintain a fit with the gearbox housing, the soapy water will flow downward from the gap between the sealing ring 104 and the gearbox housing, that is, there is a water leak in the recessed area. Bubbles may also be generated due to water leakage. Therefore, on the one hand, the first spray ring 6 is required to continuously replenish soapy water. On the other hand, the soapy water in the recessed area continues to move upwards as the multi-stage push rod 5 is pushed. After the recessed area passes the suspected leakage point, the surface of the suspected leakage point is covered with soapy water. Observe the suspected leakage point again for bubbles. If no bubbles are generated, the bubbles generated in the soapy water in the recessed area of the suspected leakage point are caused by water leakage. If bubbles are generated, it is judged that there is a leakage at this location.

[0038] At the same time, the staff uses an external suction pump to connect with the second connecting pipe 10, and then controls the external suction pump to operate to suck the soapy water adsorbed on the sponge block 8, and transports the sucked soapy water back to the location where the soapy water is stored. In this process, the dust mixed in the soapy water is intercepted by the sponge block 8, which avoids the soapy water after the return from being contaminated and affecting the subsequent detection work. After long-term use, the staff can remove the connecting plate 9 from the base 1, and at the same time drive the sponge block 8 and the second connecting pipe 10 to be removed from the base 1, and remove the sponge block 8 from the connecting plate 9 to replace the sponge block 8.

[0039] After completing the test, in the process of removing the gearbox, first use the external gas injection equipment to connect with the second gas pipe 102, then control the external gas injection equipment to input warm gas into the second gas pipe 102, and then the airflow enters the second spray ring 101 through the second gas pipe 102, and then is sprayed out through the second spray ring 101. Since the nozzle on the second spray ring 101 is tilted downward, the sprayed airflow is a warm high-speed airflow. In conjunction with the rise and fall of the second spray ring 101, the soapy water remaining on the gearbox casing is blown off, and some of the residual soapy water is dried by the warm gas, reducing the amount of soapy water remaining on the gearbox, facilitating the subsequent transfer of the gearbox, and avoiding a large amount of soapy water dripping from the surface of the gearbox to the ground, causing the ground to be wet and affecting the cleanliness of the working environment. Example

[0040] On the basis of the above embodiment 2, Figure 6-Figure 7 As shown, it also includes an electric push rod 201, a limit cover 202 and a rubber membrane 203; two symmetrically arranged electric push rods 201 are inserted on the top cover 3; the telescopic ends of all the electric push rods 201 are fixedly connected to the limit cover 202, and a blocking block 20201 is provided on the limit cover 202; four annular arrays of rubber membranes 203 are inserted on the limit cover 202.

[0041] When air flow is injected into the gearbox through the first air supply pipe 4, the electric push rod 201 is controlled to push the limit cover 202, and the limit cover 202 drives the blocking block 20201 to move downward to fit the gearbox. It should be noted that in the prior art, a reserved through-hole method is adopted, but there will also be leakage problems here, that is, the reserved through-hole position is covered by the limit cover 202, and it is judged by the rubber membrane 203 that when the rubber membrane 203 expands outward, it is judged that there is a leakage problem in the through-hole reserved for the gearbox. When a problem occurs, the staff needs to re-connect the first air supply pipe 4 and the through-hole reserved for the gearbox, or reassemble the gearbox for subsequent testing.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gearbox air tightness detection device, comprising a base (1), an isolation barrel (2), a top cover (3) and a first air supply pipe (4); the base (1) is fixedly connected to the isolation barrel (2), and the isolation barrel (2) is provided with a plurality of observation windows (2001) for observing the gearbox condition; the isolation barrel (2) is mounted with a top cover (3), and the top cover (3) is penetrated by a first air supply pipe (4), and the first air supply pipe (4) is a hose; characterized in that, The invention also includes a multi-stage push rod (5), a first spray ring (6), a first connecting pipe (7), a sponge block (8), a connecting plate (9), a second connecting pipe (10) and a placement frame (11); a plurality of multi-stage push rods (5) are fixedly connected to the base (1); the telescopic ends of all the multi-stage push rods (5) are fixedly connected to the first spray ring (6), and the first spray ring (6) is provided with a plurality of annular array nozzles; a plurality of first connecting pipes (7) are passed through the isolation barrel (2), and the first connecting pipes (7) are telescopic pipes; all the first connecting pipes (7) are connected to the first spray ring (6) and the first connecting pipes (7) are connected to the first spray ring (6). The ring (6) is connected; a connecting plate (9) is connected to the base (1); a sponge block (8) is installed on the connecting plate (9); a second connecting pipe (10) is passed through the connecting plate (9), and a placement frame (11) is fixedly connected to the interior of the isolation barrel (2); a detection component is also included, and the detection component includes a connecting ring (103) and a blocking ring (104); the telescopic ends of all the multi-stage push rods (5) are commonly connected to the connecting ring (103), and the connecting ring (103) is tightly attached to the first spray ring (6); and a blocking ring (104) is fixedly connected to the connecting ring (103).

2. The gearbox air tightness detection device according to claim 1, characterized in that: A plurality of cleaning blocks (6001) are provided on the first spray ring (6).

3. A gearbox air tightness detection device according to any one of claims 1-2, characterized in that: The base (1), the sponge block (8) and the connecting plate (9) are all configured as quick-release structures.

4. The gearbox air tightness detection device according to claim 3, characterized in that: The cleaning assembly further comprises a second spray ring (101) and a second air supply pipe (102); the second spray ring (101) is fixedly connected to the first spray ring (6); a plurality of second air supply pipes (102) are provided on the isolation barrel (2), and the second air supply pipes (102) are telescopic pipes; all the second air supply pipes (102) are in common communication with the second spray ring (101).

5. The gearbox air tightness detection device according to claim 4, characterized in that: The nozzles on the second spray ring (101) are arranged to be inclined downward.

6. The gearbox air tightness detection device according to claim 1, characterized in that: The connecting ring (103) is arranged in a ring structure with a larger upper portion and a smaller lower portion.

7. The gearbox air tightness testing device according to claim 1, characterized in that: The sealing ring (104) adopts a polyurethane sealing strip.

8. The gearbox air tightness testing device according to claim 1, characterized in that: The sealing ring (104) is arranged in a ring structure with a larger upper portion and a smaller lower portion.

9. The gearbox air tightness testing device according to claim 8, characterized in that: It also includes an electric push rod (201), a limiting cover (202) and a rubber membrane (203); a plurality of electric push rods (201) are provided on the top cover (3); the telescopic ends of all the electric push rods (201) are fixedly connected to the limiting cover (202), and a blocking block (20201) is provided on the limiting cover (202); and a plurality of rubber membranes (203) are provided on the limiting cover (202).

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