Air tightness detection device and detection method for air compressor crankcase

Abstract

The present invention provides an air tightness detection device and detection method for an air compressor crankcase. It relates to the technical field of air tightness detection. The air tightness detection device for the air compressor crankcase includes an immersion tank and a first supporting frame. The immersion tank is made of a transparent plastic material. A vertical lifting component is provided on one side of the immersion tank to drive the first supporting frame to rise and fall. A vertical support rod is fixedly installed on the bottom of the first supporting frame. A through-thread head is threaded on the bottom of the vertical support rod. A through-thread upper cover plate is fixedly installed on the bottom of the through-thread head. An upper annular sealing plate is fixedly installed on the bottom of the through-thread upper cover plate. A through-hole is provided on the vertical support rod. A booster fan is provided on one side of the first supporting frame. One end of a ventilation pipe is fixedly installed on the air outlet port of the booster fan. The present invention has the advantages of high universality, flexible operation, and reduced detection costs.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to an air tightness detection device and a detection method for an air compressor crankcase. Background Art

[0002] The air compressor crankcase is an important component in the air compressor. Its main function is to accommodate and protect the crankshaft and related components, and to store lubricating oil. The common air compressor crankcase has an overall isosceles trapezoidal shape, and usually has circular through holes on its top, two side slopes, and front and back sides. This crankcase can provide a solid shell for the crankshaft to prevent it from external damage, and can also play a role in sealing and isolation. In the preparation process of the crankcase, in order to ensure that it has good air tightness, it is generally tested for air tightness. Common detection methods include immersion method, which is to seal the holes on the crankcase, then completely immerse it in water, and then pass gas into it. By observing whether bubbles are generated, the detection purpose can be achieved.

[0003] However, in actual operation, the common immersion method has been found to have problems because the crankcases required for air compressors of different specifications are basically of different sizes. Therefore, crankcases of different external dimensions are sometimes produced. The fixtures used in the conventional immersion method have poor adaptability. Most of the time, one fixture is adapted to one crankcase, which has low flexibility and is difficult to adjust according to crankcases of different sizes, thereby reducing universality. At the same time, in order to match the inspection of different crankcases, multiple fixtures need to be prepared in advance, which increases the cost of parts for air tightness testing.

[0004] Therefore, it is necessary to provide a new air tightness detection device and detection method for an air compressor crankcase to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide an air tightness detection device and method for an air compressor crankcase, which have high universality, flexible operation and reduced detection cost.

[0006] In order to solve the above technical problems, the air tightness detection device of the air compressor crankcase provided by the present invention comprises an immersion tank and a first supporting frame, the immersion tank is made of transparent plastic material, and a vertical lifting component is provided on one side of the immersion tank, which is used to drive the first supporting frame to rise and fall; a vertical support rod is fixedly installed on the bottom of the first supporting frame, and the bottom thread of the vertical support rod is threadedly installed with a through-thread head, and the bottom end of the through-thread head is fixedly installed with a through-thread upper cover plate, and the bottom of the through-thread upper cover plate is fixedly installed with an upper annular sealing piece. A through-hole is opened on the vertical support rod, and a booster fan is provided on one side of the first supporting frame, and one end of a ventilation pipe is fixedly installed on the air outlet port of the booster fan, and the other end of the ventilation pipe extends into the through-hole and is connected with the through-thread head. The cam is connected to the chassis to slide in the chassis, and the cam is connected to the chassis to slide in the chassis, and the cam is connected to the chassis to slide in the chassis.

[0007] Preferably, the vertical lifting assembly includes a hollow support, which is arranged on one side of the immersion tank, and the side of the hollow support close to the immersion tank is set as an opening, a vertical screw is rotatably installed in the hollow support, a vertical sliding arm is threadedly installed on the vertical screw, one side of the vertical sliding arm is fixedly connected to the first supporting frame, the bottom of the booster fan is fixedly connected to the top of the vertical sliding arm, a first servo motor is fixedly installed on the top of the hollow support, the output shaft of the first servo motor is fixedly connected to the top of the vertical screw, a second servo motor is fixedly installed on the outer wall of one side of the first supporting frame, and the output shaft of the second servo motor is fixedly connected to one end of the first bidirectional screw.

[0008] Preferably, bosses are fixedly installed on both sides of the two hinged seats, arc angle rulers are slidably installed on the two bosses, the bottoms of the two arc angle rulers are fixedly connected to the two side cover plates respectively, and tightening screws are threadedly installed on the two bosses, and the two tightening screws respectively conflict with the two arc angle rulers.

[0009] Preferably, a carriage is fixedly installed at the top of the first carrying frame. An adjusting screw rod is threadedly installed at the top of the carriage. The bottom end of the adjusting screw rod is rotatably installed with an open frame. Both sides of the open frame are slidably connected to both sides of the carriage. A second bidirectional screw rod is rotatably installed inside the open frame. Two adjusting plates are threadedly installed on the second bidirectional screw rod. Longitudinal support plates are fixedly installed at the bottoms of the two adjusting plates. The tops of the two mounting support plates are fixedly connected to the two longitudinal support plates respectively. A third servo motor is fixedly installed on an outer wall of one side of the open frame. The output shaft of the third servo motor is fixedly connected to one end of the second bidirectional screw rod.

[0010] Preferably, two inverted U-shaped support rods are fixedly installed at the top of the bottom support. The first carrying frame is located inside the two inverted U-shaped support rods. Two first telescopic cylinders are fixedly installed at the top of the first carrying frame. The output shafts of the two first telescopic cylinders are fixedly connected to the two inverted U-shaped support rods respectively.

[0011] Preferably, a concave base is fixedly installed at the bottom of the bottom support. A through cavity is formed in the concave base. The same third bidirectional screw rod is rotatably installed on the inner walls of both sides of the through cavity. Two transverse moving support plates are threadedly installed on the third bidirectional screw rod. First C-shaped rods are slidably installed on both sides of the concave base. The bottom ends of the two first C-shaped rods are fixedly connected to the two transverse moving support plates respectively. Transverse correction pieces are fixedly installed at the top ends of the two first C-shaped rods. Two longitudinal supports are fixedly installed in the through cavity. The same fourth bidirectional screw rod is rotatably installed on the two longitudinal supports. Two longitudinal moving support plates are threadedly installed on the fourth bidirectional screw rod. Second C-shaped rods are slidably installed on the two longitudinal supports. The bottom ends of the two second C-shaped rods are fixedly connected to the two longitudinal moving support plates respectively. Longitudinal correction pieces are fixedly installed at the top ends of the two second C-shaped rods. The transverse correction pieces and the longitudinal correction pieces are both located above the bottom support. A plurality of movable balls are embedded on the sides where the two transverse correction pieces are close to each other and on the sides where the two longitudinal correction pieces are close to each other.

[0012] Preferably, the base support is provided with four long sliding openings distributed in a circular array, and the bottoms of the two transverse correction plates and the two longitudinal correction plates are fixedly installed with linkage folding strips, and a lifting screw is rotatably installed at the bottom of the recess of the concave base, and a cross connecting strip is threadedly installed on the lifting screw, and the top of the cross connecting strip is fixedly installed with a cross sliding rod, and four lifting columns distributed in a circular array are slidably installed on the cross sliding rod, and the top of the lifting column is set to a spherical surface, and the tops of the four lifting columns respectively pass through the four linkage folding strips and are slidably connected to the corresponding linkage folding strips, the bottom end of the lifting screw extends into the through cavity and is fixedly installed with a first bevel gear, and a connecting shaft is rotatably installed on one side of the concave base, one end of the connecting shaft extends into the through cavity and is fixedly installed with a second bevel gear, and the first bevel gear is meshed with the second bevel gear.

[0013] Preferably, a support platform is fixedly installed on the outer wall of one side of the immersion pool away from the hollow support, a drying box is fixedly installed on the top of the support platform, a shuttle port and two air vents are opened on the top of the drying box, a hot air blower is fixedly installed on one side of the drying box, and the air outlet port of the hot air blower extends into the drying box, a rodless cylinder is fixedly installed on the bottom of the support platform, a vertical rod is fixedly installed on the slider of the rodless cylinder, the top end of the vertical rod passes through the support platform and the drying box and is slidably connected to the two, the top end of the vertical rod extends to the top of the drying box and is fixedly installed with a placing table, a mounting arm is provided above the drying box, a second telescopic cylinder is fixedly installed on the top of the mounting arm, the output shaft of the second telescopic cylinder passes through the mounting arm and is slidably connected to the mounting arm, A mounting frame is fixedly installed on the upper portion, a connecting rod is rotatably installed on the bottom of the mounting frame, a second supporting frame is fixedly installed on the bottom end of the connecting rod, a fifth servo motor is fixedly installed in the mounting frame, the output shaft of the fifth servo motor is fixedly connected to the top end of the connecting rod, a fifth bidirectional screw is rotatably installed in the second supporting frame, two second push plates are threadedly installed on the fifth bidirectional screw, the bottoms of the two second push plates extend to the bottom of the second supporting frame and are slidably connected to the bottom of the second supporting frame, the bottoms of the two second push plates are fixedly installed with connecting folding plates, the bottoms of the two connecting folding plates are fixedly installed with panels, the bottoms of the two panels are fixedly installed with two third telescopic cylinders, and the output shafts of the four third telescopic cylinders are fixedly installed with clamping plates.

[0014] Preferably, a vertical plate is fixedly installed on the top of the support platform, one side of the mounting arm is fixedly connected to the vertical plate, an avoidance opening is opened on the vertical plate, the drying box passes through the avoidance opening, and a fourth servo motor is fixedly installed on the outer wall of one side of the second supporting frame, and the output shaft of the fourth servo motor is fixedly connected to one end of the fifth bidirectional screw.

[0015] The present invention also provides a method for detecting the air tightness of an air compressor crankcase, comprising the following steps:

[0016] T1. Place the crankcase: Place the crankcase to be tested on the bottom support. First, rotate the third bidirectional screw, then the fourth bidirectional screw. Use two transverse and two longitudinal correction pieces to position the crankcase in the center directly below the upper annular cover.

[0017] T2. Lift the crankcase: Turn the connecting shaft clockwise, the lifting screw starts to rotate, and the four lifting columns start to rise. Use the four lifting columns to lift the crankcase;

[0018] T3. Replace the through-hole seals; unscrew the through-hole upper cover and longitudinal cover, unscrew the through-hole thread heads and solid thread heads, take out the upper annular seal and longitudinal seal of corresponding sizes, and screw the through-hole thread heads and solid thread heads on them into the vertical support rods and mounting plate respectively;

[0019] T4. Adjust the height of the longitudinal sealing sheet and the tilt angle of the side sealing sheet: Turn the adjustment screw, and the opening frame will lower the longitudinal support plate and the longitudinal sealing sheet, and finally adjust the longitudinal sealing sheet to the specified height;

[0020] Tighten the two screws, move the two side covers, and after adjusting the two side covers to the specified angle, tighten the two screws.

[0021] T5. Seal the crankcase through-holes. The output shafts of the two first telescopic cylinders are activated to extend, raising the bottom support. When the top of the crankcase contacts the upper annular sealing plate, the first telescopic cylinders are closed. The third servo motor is activated in the positive direction, and the two adjustment plates move toward each other, attaching the two longitudinal sealing plates to the front and rear sides of the crankcase to seal the through-holes. The second servo motor is activated in the positive direction, and the two first push plates move toward each other, using the two side sealing plates to block the through-holes on the oblique sides of the crankcase.

[0022] T6. Air tightness test: Start the first servo motor in the forward direction, and the vertical slide arm will lower the first load-bearing frame, immerse the crankcase in the immersion tank, start the booster fan, and the booster fan will pass the gas into the crankcase. At this time, observe the inside of the immersion tank. If there are bubbles, it means that the crankcase is unqualified, otherwise it is qualified.

[0023] Compared with related technologies, the air tightness detection device and detection method for the air compressor crankcase provided by the present invention have the following beneficial effects:

[0024] First, the present invention can make the tops of crankcases of different heights contact the upper annular sealing piece by providing a bottom support that can be lifted and lowered, and can seal crankcases with front and rear through-holes of different heights by providing a longitudinal sealing piece that can be lifted and lowered. In addition, by using a rotatable side cover plate and an arc-shaped angle ruler to assist in sealing the through-holes of crankcases with different inclination angles on both sides, the upper annular sealing piece and the longitudinal sealing piece can be adaptively replaced, and the maximized side sealing piece can be used to perform airtightness testing on crankcases of different specifications and sizes, thereby greatly improving universality, making operation more flexible, reducing the number of fixture assemblies manufactured, and thus reducing the testing cost to a certain extent.

[0025] 2. The present invention can automatically push the crankcase placed on the base to the center position through two horizontal correction plates and two longitudinal correction plates, thereby quickly forming a positioning effect, so that it is located directly below the upper annular cover, and then can be quickly put into the inspection work, thereby improving the inspection efficiency. Moreover, after the crankcase is positioned in the center position, the crankcase can be lifted by rising four lifting columns, and finally the crankcase can be separated from the horizontal correction plates and the longitudinal correction plates, so that its bottom is completely exposed, and it will not come into contact with the base or the multiple movable balls. In this way, the crankcase can be exposed to the greatest extent, so that it can be fully tested for air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a first embodiment of an air tightness detection device for an air compressor crankcase provided by the present invention;

[0027] Figure 2 A schematic cross-sectional view of the hollow support in the first embodiment of the air tightness detection device for an air compressor crankcase provided by the present invention;

[0028] Figure 3 This is a schematic diagram of the assembly of the first load-bearing frame and the bottom bracket in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0029] Figure 4 A schematic diagram of the connection structure of the bottom bracket and the concave base in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0030] Figure 5 A schematic diagram of the connection structure between the first supporting frame and the opening frame in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0031] Figure 6 A schematic diagram of the back-side connection structure of the booster fan and the vent pipe in the first embodiment of the air tightness detection device for the air compressor crankcase provided by the present invention;

[0032] Figure 7 A schematic side cross-sectional view of the first load-bearing frame of the first embodiment of the air tightness detection device for an air compressor crankcase provided by the present invention;

[0033] Figure 8 A schematic diagram of the main cross-sectional structure of the first supporting frame in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0034] Figure 9 A schematic diagram of a quarter cross-section of a through-threaded head and a through-threaded upper cover plate in a first embodiment of an air tightness detection device for an air compressor crankcase provided by the present invention;

[0035] Figure 10 A schematic diagram of the connection structure of the solid threaded head and the longitudinal cover plate in the first embodiment of the air tightness detection device for the air compressor crankcase provided by the present invention;

[0036] Figure 11 A schematic cross-sectional view of the bottom bracket of the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0037] Figure 12 A schematic front view of the structure of the bottom bracket and the concave base in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0038] Figure 13 A schematic diagram of the internal structure of the through-hole in the first embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0039] Figure 14 A schematic diagram of a state in which a crankcase is placed on a bottom support in a first embodiment of an air tightness detection device for an air compressor crankcase provided by the present invention;

[0040] Figure 15 A schematic diagram of the three-dimensional structure of a second embodiment of the air tightness detection device for an air compressor crankcase provided by the present invention;

[0041] Figure 16 A schematic diagram of the connection structure of the support platform and the vertical plate in the second embodiment of the air tightness detection device for the crankcase of an air compressor provided by the present invention;

[0042] Figure 17 A schematic cross-sectional view of a drying box in a second embodiment of the air tightness detection device for an air compressor crankcase provided by the present invention;

[0043] Figure 18Schematic diagram of the internal structure of the second bearing frame in the second embodiment of the airtightness detection device for the air compressor crankcase provided by the present invention;

[0044] Figure 19 Schematic diagram of the connection structure between the third telescopic cylinder and the clamping plate in the second embodiment of the airtightness detection device for the air compressor crankcase provided by the present invention.

[0045] Reference numerals in the figure: 1, immersion pool; 2, hollow support; 3, vertical screw; 4, vertical sliding arm; 5, first bearing frame; 6, vertical support rod; 7, through-threaded head; 8, through-top cover plate; 9, upper annular sealing piece; 10, through-hole; 11, booster fan; 12, ventilation pipe; 13, first bidirectional screw; 14, first pushing plate; 15, hinge seat; 16, side cover plate; 17, side sealing piece; 18, convex platform; 19, arc angle ruler; 20, sliding frame; 21, adjusting screw; 22, open frame; 23, second bidirectional screw; 24, adjusting plate; 25, longitudinal carrying plate; 26, installation backing plate; 27, solid threaded head; 28, longitudinal cover plate; 29, longitudinal sealing piece; 30, bottom support; 31, U-shaped support rod; 32, first telescopic cylinder; 33, concave base; 34, through cavity; 35, third bidirectional screw; 36, transverse moving support plate; 37, first C-shaped rod; 38, transverse correction piece; 39, longitudinal support; 40, fourth bidirectional screw; 41, longitudinal moving support plate; 42, second C-shaped rod; 43, longitudinal correction piece; 44, long sliding opening; 45, lifting screw; 46, cross connecting bar; 47, cross sliding rod; 48, lifting column; 49, linkage folding bar; 50, connecting rotating shaft; 51, support table; 52, drying box; 53, hot air blower; 54, rodless cylinder; 55, vertical rod; 56, placement table; 57, vertical plate; 58, installation arm; 59, second telescopic cylinder; 60, installation frame; 61, linkage rod; 62, second bearing frame; 63, fifth bidirectional screw; 64, second pushing plate; 65, connecting folding plate; 66, panel; 67, third telescopic cylinder; 68, clamping plate. Detailed implementation manners

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] First embodiment:

[0048] Please refer to [[ID=ID=No]] Figures 1-14In the first embodiment of the present invention, the air tightness detection device of the crankcase of the air compressor includes: an immersion tank 1 and a first supporting frame 5, wherein the immersion tank 1 is made of a transparent plastic material, and the internal detection process can be observed intuitively. A vertical lifting component is provided on one side of the immersion tank 1 to drive the first supporting frame 5 to rise and fall; a vertical support rod 6 is fixedly installed at the bottom of the first supporting frame 5, and the bottom thread of the vertical support rod 6 is threaded with a through-thread head 7, and the bottom end of the through-thread head 7 is fixedly installed with a through-thread upper cover plate 8, and the bottom of the through-thread upper cover plate 8 is fixedly installed with an upper annular sealing piece 9, and the detachable design makes the upper annular sealing piece 9 It can be replaced according to needs. A through-hole 10 is opened on the vertical support rod 6. A booster fan 11 is provided on one side of the first supporting frame 5. Its air outlet is connected to the through-thread head 7 through a vent pipe 12, and the vent pipe 12 passes through the through-hole 10. A first bidirectional screw 13 is rotatably installed in the first supporting frame 5, and two first push plates 14 are threadedly installed on it. The bottoms of the two first push plates 14 extend to the bottom of the first supporting frame 5 and are slidably connected to the bottom of the first supporting frame 5. The sliding method is to open two limit ports at the bottom of the first supporting frame 5. The two first push plates 14 are connected to the bottom of the first supporting frame 5. The plates 14 pass through the two limit openings respectively and contact the inner walls of the limit openings, thereby ensuring the linear movement of the first push plate 14. A second servo motor is fixedly installed on the outer wall of one side of the first supporting frame 5, and its output shaft is fixedly connected to one end of the first bidirectional screw 13. The bottoms of the two first push plates 14 are fixedly installed with hinged seats 15, and the bottoms of the two hinged seats 15 are hinged with side cover plates 16. The sides of the two side cover plates 16 that are close to each other are fixedly installed with side sealing pieces 17. Through the hinged design of the side cover plates 16, its inclination angle can be adaptively adjusted to adapt to different crankcases, and on the first supporting frame 5 There are mounting plates 26 on both sides, and solid threaded heads 27 are threadedly installed on the sides of the two mounting plates 26 that are close to each other. A longitudinal cover plate 28 is fixedly installed on the ends of the two solid threaded heads 27 that are close to each other. A longitudinal sealing piece 29 is fixedly installed on the sides of the two longitudinal cover plates 28 that are close to each other. Like the upper annular sealing piece 9, the longitudinal sealing piece 29 is also detachable and can be replaced according to needs; and a bottom support 30 that can be moved up and down is provided under the first supporting frame 5 for placing the crankcase, and through the up and down moving design, the crankcase can be lifted up, and finally the through hole on the top of the crankcase is in conflict with the upper annular sealing piece 9.

[0049] like Figure 2As shown, in the above method, the vertical lifting assembly mentioned includes a hollow support 2, which is arranged on one side of the immersion tank 1, and the side of the hollow support 2 close to the immersion tank 1 is set as an opening, and a vertical screw 3 is rotatably installed in the hollow support 2, and a vertical slide 4 is threadedly installed on it, one side of the vertical slide 4 is fixedly connected to the first supporting frame 5, and the bottom of the booster fan 11 is fixedly connected to the top of the vertical slide 4, and two guide columns are fixedly installed in the hollow support 2, and both of the guide columns pass through the vertical slide 4 and are slidably connected to the vertical slide 4, and a first servo motor is fixedly installed on the top of the hollow support 2, and its output shaft is fixedly connected to the top of the vertical screw 3.

[0050] like Figure 5 and Figure 7 As shown, in this method, in order to accurately adjust the inclination angle of the side cover 16 and adjust the height position of the longitudinal cover 29 to meet the needs of sealing the through holes on crankcases of different sizes, bosses 18 are fixedly installed on both sides of the two hinged seats 15, and arc angle rulers 19 are slidably installed on the two bosses 18, and the arc angle rulers 19 are engraved with angle lines. The bottoms of the two arc angle rulers 19 are respectively fixedly connected to the two side cover plates 16, and tightening screws are threaded on the two bosses 18. The two tightening screws respectively conflict with the two arc angle rulers 19, and through channels are opened on the two first push plates 14. The two arc angle rulers 19 can pass through the corresponding through channels so as not to interfere with the first push plate 14; a slide 20 is fixedly installed on the top of the first supporting frame 5, and an adjusting screw 21 is threaded on its top. The bottom end of the adjusting screw 21 is rotated and installed An opening frame 22 is equipped, and both sides of the opening frame 22 are slidingly connected to the two sides of the slide 20 respectively. The sliding connection method is that guide openings are opened on both sides of the slide 20, and guide strips are fixed on both sides of the opening frame 22. The two guide strips extend into the two guide openings respectively and contact the inner walls of the guide openings, thereby ensuring that the opening frame 22 can only be lifted and lowered linearly. A second bidirectional screw 23 is rotatably installed in the opening frame 22, and two adjusting plates 24 are threadedly installed on it, and two longitudinal horizontal bars are fixed in the opening frame 22. The two longitudinal horizontal bars pass through the two adjusting plates 24 and are slidingly connected to the two adjusting plates 24. A longitudinal support plate 25 is fixedly installed at the bottom of the two adjusting plates 24, and the tops of the two mounting plates 26 are fixedly connected to the two longitudinal support plates 25 respectively. A third servo motor is fixedly installed on the outer wall of one side of the opening frame 22, and its output shaft is fixedly connected to one end of the second bidirectional screw 23.

[0051] like Figure 3As shown, in this method, in order to lift the crankcase, the top of the crankcase is made to contact the upper annular sealing piece 9. Two inverted U-shaped support rods 31 are fixedly installed at the top of the bottom support 30. The first bearing frame 5 passes through the middle of the two inverted U-shaped support rods 31. Two first telescopic cylinders 32 are fixedly installed at the top of the first bearing frame 5. The output shafts of the two first telescopic cylinders 32 are respectively fixedly connected to the two inverted U-shaped support rods 31.

[0052] As Figure 11 and Figure 12 As shown, in this method, in order to position the crankcase at the center position so that it is directly below the upper annular sealing piece 9, a concave base 33 is fixedly installed at the bottom of the bottom support 30. A through cavity 34 is provided thereon. The same third bidirectional screw 35 is rotatably installed on the inner walls on both sides of the through cavity 34. Two transverse moving support plates 36 are threadedly installed on the third bidirectional screw 35. The first C-shaped rods 37 are slidably installed on both sides of the concave base 33. The bottom ends of the two first C-shaped rods 37 are respectively fixedly connected to the two transverse moving support plates 36. Transverse correction pieces 38 are fixedly installed at the top ends of the two first C-shaped rods 37. Two longitudinal supports 39 are fixedly installed in the through cavity 34. The same fourth bidirectional screw 40 is rotatably installed on the two longitudinal supports 39. Two longitudinal moving support plates 41 are threadedly installed on the fourth bidirectional screw 40. The second C-shaped rods 42 are slidably installed on the two longitudinal supports 39. The bottom ends of the two second C-shaped rods 42 are respectively fixedly connected to the two longitudinal moving support plates 41. Longitudinal correction pieces 43 are fixedly installed at the top ends of the two second C-shaped rods 42. The transverse correction pieces 38 and the longitudinal correction pieces 43 are both located above the bottom support 30. A plurality of movable balls are embedded on the side where the two transverse correction pieces 38 are close to each other and on the side where the two longitudinal correction pieces 43 are close to each other. First, rotate the third bidirectional screw 35 to push the crankcase to the horizontal center by using the two transverse correction pieces 38. Then, rotate the fourth bidirectional screw 40 to push the crankcase to the vertical center by using the two longitudinal correction pieces 43, so as to realize the centering positioning work of the crankcase. Moreover, both the third bidirectional screw 35 and the fourth bidirectional screw 40 are made of alloy steel, having good corrosion resistance and waterproof performance. <000​​​As shown, in this method, in order to be able to lift the positioned crankcase so that its bottom leaks out without contacting multiple movable balls to ensure comprehensive detection, four long sliding openings 44 distributed in a circular array are opened on the base 30, and the bottoms of the two transverse correction plates 38 and the two longitudinal correction plates 43 are fixedly installed with linkage folding strips 49. A lifting screw 45 is rotatably installed at the bottom of the recess of the concave base 33, and a reinforcing plate is fixed in the concave base 33. The top of the lifting screw 45 passes through the reinforcing plate and is rotatably connected to it, and a cross connecting strip 46 is threadedly installed on the lifting screw 45. The top of the cross connecting strip 46 is fixedly installed with a cross slide 47, and four lifting columns 48 distributed in a circular array are slidably installed on the cross slide 47. The top of the lifting column 48 is set to be a spherical surface. When the spherical surface contacts the crankcase, the contact part is a point, thereby ensuring comprehensive detection. The top ends of the four lifting columns 48 respectively pass through the four linkage folding strips 49 and are slidably connected to the corresponding linkage folding strips 49. The bottom end of the lifting screw 45 extends into the through-hole 34 and is fixedly installed with a first bevel gear. A connecting shaft 50 is rotatably installed on one side of the concave base 33. One end of the connecting shaft 50 extends into the through-hole 34 and is fixedly installed with a second bevel gear. The first bevel gear is meshed with the second bevel gear. In order to ensure that the cross-connecting bar 46 performs stable linear lifting and lowering, a limiting column is fixed in the recess of the concave base 33. The limiting column passes through the cross-connecting bar 46 and is slidably connected to it.

[0054] In this embodiment:

[0055] Multiple upper annular sealing pieces 9 and longitudinal sealing pieces 29 are provided, and each has different sizes, which can be selected for use. In addition, the through-thread heads 7 on each upper annular sealing piece 9 are of the same size, and the solid thread heads 27 on each longitudinal sealing piece 29 are of the same size. In addition, the sizes of the side cover plates 16 and side sealing pieces 17 are designed to be maximized, which can meet the requirements of sealing through holes of different apertures.

[0056] When it is necessary to perform an airtightness test on the crankcase of an air compressor, first inject a sufficient amount of clear water into the immersion pool 1, then take out the crankcase to be tested and place it on the bottom support 30. Subsequently, rotate the third double-headed screw 35. Through its threaded engagement with the transverse moving support plate 36, the two transverse moving support plates 36 move towards each other. Under the drive of the first C-shaped rod 37, the two transverse correction pieces 38 move towards each other until the movable balls on the two transverse correction pieces 38 both contact the crankcase, then the transverse centering operation of the crankcase is completed. Subsequently, rotate the fourth double-headed screw 40, and the two longitudinal moving support plates 41 move towards each other. Under the drive of the second C-shaped rod 42, the two longitudinal correction pieces 43 move towards each other until the movable balls on the two longitudinal correction pieces 43 both contact the crankcase and then stop rotating the fourth double-headed screw 40. At this time, the crankcase is centered both horizontally and vertically, exactly below the upper annular sealing piece 9. And during the movement of the transverse correction piece 38 and the longitudinal correction piece 43, under the drive of the linkage folding strip 49, the four lifting columns 48 also move together;

[0057] Then, rotate the connecting rotating shaft 50 clockwise. Through the meshing between the first bevel gear and the second bevel gear, the lifting screw 45 can be driven to rotate. At this time, the cross connecting strip 46 will carry the cross sliding rod 47 upward, and then can carry the four lifting columns 48 upward. When the lifting column 48 contacts the bottom of the crankcase, due to the rolling performance of the movable ball, the crankcase will be gradually lifted until the crankcase separates from the transverse correction piece 38 and the longitudinal correction piece 43 and then stop rotating the connecting rotating shaft 50. After that, replace the upper annular sealing piece 9 and the longitudinal sealing piece 29 with corresponding sizes according to the sizes of the through holes at the top and the front and rear sides of the crankcase. When replacing, directly rotate the through-hole upper cover plate 8 and the longitudinal cover plate 28 to screw out the through-hole threaded head 7 and the solid threaded head 27. Subsequently, take out the upper annular sealing piece 9 and the longitudinal sealing piece 29 with corresponding sizes, and screw the through-hole threaded head 7 and the solid threaded head 27 on them into the vertical support rod 6 and the mounting backing plate 26 respectively;

[0058] Subsequently, start the output shafts of the two first telescopic cylinders 32 to extend. Under the drive of the U-shaped support rod 31, the bottom support 30 starts to rise until the top of the crankcase contacts the upper annular sealing piece 9, and then the output shafts of the first telescopic cylinders 32 stop extending. At this time, the through hole at the top of the crankcase is blocked;

[0059] At this time, first adjust the height positions of the two longitudinal sealing pieces 29 according to the through holes on the front and rear sides of the crankcase. When adjusting, directly turn the adjusting screw 21. Through the rotation relationship between it and the opening frame 22, at the same time, the opening frame 22 is restricted by the slide 20, and the opening frame 22 descends with the longitudinal supporting plate 25, and then can descend with the longitudinal sealing piece 29. At this time, observe the positional relationship between the longitudinal sealing piece 29 and the through holes on the front and rear sides of the crankcase, and finally adjust the longitudinal sealing piece 29 to the specified height. Then, start the third servo motor in the positive direction, and its output shaft drives the second bidirectional screw 23 to rotate, so that the two adjusting plates 24 move in the direction of approaching each other, and finally the two longitudinal sealing pieces 29 are respectively attached to the front and rear sides of the crankcase to seal the through holes.

[0060] Then, adjust the inclination angle of the two side cover plates 16 according to the angle of the beveled edges on both sides of the crankcase. When adjusting, first screw one of the tightening screws to separate it from the corresponding arc angle ruler 19, and then move the corresponding side cover plate 16. At this time, it passes through the scale line on the arc angle ruler 19. After adjusting the side cover plate 16 to the specified angle, tighten the tightening screw again, and then adjust the inclination angle of the other side cover plate 16 in the same way. After the adjustment is completed, start the second servo motor in the forward direction, and the two first push plates 14 approach each other. Finally, use the two side sealing plates 17 to block the through holes on the beveled edges on both sides of the crankcase.

[0061] Afterwards, the first servo motor is started in the forward direction, and its output shaft drives the vertical screw 3 to rotate the rod, and the vertical sliding arm 4 brings the first supporting frame 5 down, and the fixed crankcase gradually sinks into the immersion tank 1. Until it is completely immersed, the first servo motor is turned off, and then the booster fan 11 is started. The booster fan 11 passes the gas into the crankcase through the through-thread head 7, the through-thread upper cover plate 8 and the upper annular sealing piece 9. Then the inside of the immersion tank 1 can be observed. If bubbles are generated around the crankcase, it means that the crankcase is unqualified, otherwise it is qualified. After the inspection is completed, the first servo motor is started in the reverse direction to bring the crankcase out of the immersion tank 1, and then the second servo motor and the third servo motor are started in the reverse direction to separate the side sealing piece 17 and the longitudinal sealing piece 29 from the crankcase. Immediately, the output shafts of the two first telescopic cylinders 32 are started to retract, and the crankcase is brought down to separate from the upper annular sealing piece 9, and the inspected crankcase can be removed.

[0062] Compared with the related art, the air tightness detection device for the air compressor crankcase provided by the present invention has the following beneficial effects:

[0063] First, the present invention can make the tops of crankcases of different heights contact with the upper annular sealing piece 9 by providing a bottom support 30 that can be lifted and lowered, and can seal crankcases with different front and rear through-hole heights by providing a longitudinal sealing piece 29 that can be lifted and lowered. In addition, with the auxiliary cooperation of the rotatable side cover plate 16 and the arc angle ruler 19, the through-holes of crankcases with different inclination angles on both sides can be sealed. At the same time, the upper annular sealing piece 9 and the longitudinal sealing piece 29 can be adaptively replaced, and the maximized side sealing piece 17 can be used to perform airtightness testing on crankcases of different specifications and sizes, thereby greatly improving universality, making the operation more flexible, reducing the number of fixture assemblies manufactured, and thus reducing the testing cost to a certain extent.

[0064] 2. The present invention can automatically push the crankcase placed on the base 30 to the center position through two horizontal correction plates 38 and two longitudinal correction plates 43, thereby quickly forming a positioning effect, so that it is located directly below the upper annular sealing plate 9, and then can be quickly put into the inspection work, thereby improving the inspection efficiency. Moreover, after the crankcase is positioned in the center position, the crankcase can be lifted by rising the four lifting columns 48, and finally the crankcase is separated from the horizontal correction plates 38 and the longitudinal correction plates 43, so that its bottom is completely exposed, and it will not contact the base 30 or the multiple movable balls. In this way, the crankcase can be exposed to the greatest extent, so that it can be fully tested for air tightness.

[0065] Second embodiment:

[0066] Based on the air compressor crankcase air tightness detection device provided in the first embodiment of the present application, the second embodiment of the present application provides another air compressor crankcase air tightness detection device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0067] The second embodiment of the present invention will be further described below with reference to the accompanying drawings and implementation plans.

[0068] Please refer to Figures 15-19The air tightness detection device for the crankcase of the air compressor also includes a support platform 51, which is fixedly mounted on the outer wall of the immersion pool 1 on the side away from the hollow support 2. A drying box 52 is fixedly mounted on the top of the support platform 51. A shuttle port and two air vents are opened on the top of the drying box 52. A hot air blower 53 is fixedly mounted on one side of the drying box 52, and its air outlet extends into the drying box 52. A rodless cylinder 54 is fixedly mounted on the bottom of the support platform 51, and a vertical rod 55 is fixedly mounted on its own slider. The top of the vertical rod 55 passes through the support platform 51 and the drying box 52 and is slidably connected to the two. The top of the vertical rod 55 extends to the top of the drying box 52 and is fixedly installed with a placing table 56. The top end surface of the placing table 56 is flush with the top end surface of the bottom bracket 30 in the initial state. A mounting arm 58 is provided above the drying box 52. A second telescopic cylinder 59 is fixedly installed on the top of the mounting arm 58. Its output shaft passes through the mounting arm 58 and is slidably connected to the mounting arm 58. A mounting frame 60 is fixedly installed on the output shaft of the second telescopic cylinder 59, and an anti-rotation rod is slidably installed on the mounting arm 58. The bottom end of the anti-rotation rod is connected to the mounting frame 60, so as to prevent the output shaft of the second telescopic cylinder 59 from rotating. Rotate, a connecting rod 61 is rotatably installed at the bottom of the mounting frame 60, and a second supporting frame 62 is fixedly installed at its bottom end. A fifth servo motor is fixedly installed in the mounting frame 60, and its output shaft is fixedly connected to the top of the connecting rod 61. A fifth bidirectional screw 63 is rotatably installed in the second supporting frame 62, and two second push plates 64 are threadedly installed on the fifth bidirectional screw 63. The bottoms of the two second push plates 64 extend to the bottom of the second supporting frame 62 and are slidably connected to the bottom of the second supporting frame 62. In addition, two component rods are fixed in the second supporting frame 62, and the two component rods are fixed to the bottom of the second supporting frame 62. The force rods pass through the two second push plates 64 and are slidably connected to the two second push plates 64. The bottom of the two second push plates 64 is fixedly installed with a connecting folding plate 65. The bottom of the two connecting folding plates 65 is fixedly installed with a panel 66. The bottom of the two panels 66 is fixedly installed with two third telescopic cylinders 67. The output shafts of the four third telescopic cylinders 67 are fixedly installed with clamping plates 68. In order to prevent the output shafts of the third telescopic cylinders 67 from rotating, U-shaped sliding rods are fixed at the bottom of the two panels 66. The two U-shaped sliding rods pass through the corresponding clamping plates 68 and are slidably connected to the corresponding clamping plates 68.

[0069] like Figure 16As shown, in this method, in order to provide fixed support for the mounting arm 58, a vertical plate 57 is fixedly installed on the top of the support platform 51, one side of the mounting arm 58 is fixedly connected to the vertical plate 57, an escape opening is opened on the vertical plate 57, the drying box 52 passes through the escape opening, and a fourth servo motor is fixedly installed on the outer wall of one side of the second supporting frame 62, and its output shaft is fixedly connected to one end of the fifth bidirectional screw 63.

[0070] In this method, in order to block the shuttle opening at the top of the drying box 52 during the drying process, a blocking plate adapted to the shuttle opening can be prepared in advance to form a blocking effect.

[0071] In this embodiment:

[0072] In the initial state, the output shaft of the second telescopic cylinder 59 is in an extended state, and the crankcase to be tested is placed on the placement table 56;

[0073] After the inspection of the current crankcase is completed, the connecting shaft 50 is rotated counterclockwise to lower the lifting column 48 and bring the crankcase to the bottom support 30. In order to quickly eliminate the water stains remaining on it, the fourth servo motor can be started in the reverse direction after the crankcase is moved out of the immersion tank 1. Its output shaft drives the fifth bidirectional screw 63 to rotate, and the two second push plates 64 move away from each other. After the two second push plates 64 move to the final position, the fourth servo motor is turned off. At this time, the inspected crankcase is located between the corresponding two clamping plates 68, and the crankcase to be inspected on the display table 56 is located between the corresponding two clamping plates 68. Then the output shafts of the four third telescopic cylinders 67 are started to extend, and the two crankcases can be clamped. Then, the output shaft of the second telescopic cylinder 59 is started to retract, so that the two crankcases rise.

[0074] Then, the fifth servo motor is started in the positive direction, and its output shaft drives the connecting rod 61 to rotate, which in turn can drive the second supporting frame 62 to rotate. When the second supporting frame 62 rotates 180 degrees, the fifth servo motor is turned off. At this time, the two crankcases exchange positions, and then the output shaft of the second telescopic cylinder 59 is started to extend, and the crankcase that has been tested is placed on the display table 56, and the crankcase that has not been tested is placed on the bottom bracket 30. Then, the output shaft of the third telescopic cylinder 67 is started to retract, and the two crankcases are released. Then, the fourth servo motor is started in the positive direction, so that the two second push plates 64 are close to each other, and the clamping plate 68 is brought back to its original position. After that, While the inspection work can continue, on the other side, the rodless cylinder 54 is started, and the slider on it brings the placement table 56 down, and finally the wet crankcase is brought into the drying box 52, and then the sealing plate is covered to cover the shuttle port, and then the hot air blower 53 is started, and hot air can be introduced into the drying box 52 to quickly dry the crankcase. After the drying is completed, the sealing plate is removed, and then the rodless cylinder 54 is started to take the dried crankcase out of the drying box 52, and then it is taken off the placement table 56 and placed in the next crankcase to be inspected. After the previous crankcase is inspected, the two crankcases can be swapped again with the same steps mentioned above.

[0075] However, the fifth servo motor at this time needs to be started in the reverse direction, and the subsequent fifth servo motor needs to be started in the forward and reverse directions to avoid entanglement of the external wiring of the third telescopic cylinder 67.

[0076] The present invention also provides a method for detecting the air tightness of an air compressor crankcase, comprising the following steps:

[0077] T1. Place the crankcase: Place the crankcase to be tested on the base 30. First, rotate the third bidirectional screw 35, then the fourth bidirectional screw 40. Use the two transverse straightening blades 38 and the two longitudinal straightening blades 43 to position the crankcase in the center directly below the upper annular cover 9.

[0078] T2. Lift the crankcase: Rotate the connecting shaft 50 clockwise, the lifting screw 45 starts to rotate, and the four lifting columns 48 start to rise. Use the four lifting columns 48 to lift the crankcase;

[0079] T3. Replace the through-hole sealing piece; unscrew the through-hole upper cover plate 8 and the longitudinal cover plate 28, unscrew the through-hole thread head 7 and the solid thread head 27, take out the upper annular sealing piece 9 and the longitudinal sealing piece 29 of the corresponding size, and screw the through-hole thread head 7 and the solid thread head 27 on the two into the vertical support rod 6 and the mounting plate 26 respectively;

[0080] T4. Adjust the height of the longitudinal sealing sheet 29 and the inclination angle of the side sealing sheet 17: Turn the adjusting screw 21, and the opening frame 22 lowers the longitudinal support plate 25 and the longitudinal sealing sheet 29, and finally adjust the longitudinal sealing sheet 29 to the specified height;

[0081] Tighten the two tightening screws, move the two side covers 16, and after adjusting the two side covers 16 to the specified angle, tighten the two tightening screws;

[0082] T5. Block the crankcase through-hole; start the output shafts of the two first telescopic cylinders 32 to extend, and the bottom support 30 to rise. When the top of the crankcase contacts the upper annular sealing plate 9, the first telescopic cylinder 32 is closed, and the third servo motor is started in the positive direction. The two adjustment plates 24 move toward each other, and the two longitudinal sealing plates 29 are respectively attached to the front and rear sides of the crankcase to block the through-hole. The second servo motor is started in the positive direction, and the two first push plates 14 move toward each other. The through-holes on the oblique sides of the crankcase are blocked by the two side sealing plates 17.

[0083] T6. Air tightness test: Start the first servo motor in the forward direction, and the vertical slide arm 4 lowers the first supporting frame 5, immersing the crankcase in the immersion tank 1. Start the booster fan 11, which will introduce gas into the crankcase. At this time, observe the inside of the immersion tank 1. If there are bubbles, it means that the crankcase is unqualified, otherwise it is qualified.

[0084] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An air tightness detection device for an air compressor crankcase, comprising a water immersion tank and a first supporting frame, wherein the water immersion tank is made of a transparent plastic material, and is characterized in that: A vertical lifting assembly is provided on one side of the immersion tank for driving the first load-bearing frame to move up and down; The bottom of the first supporting frame is fixedly installed with a vertical support rod, and the bottom thread of the vertical support rod is threadedly installed with a through-thread head, and the bottom end of the through-thread head is fixedly installed with a through-thread upper cover plate, and the bottom of the through-thread upper cover plate is fixedly installed with an upper annular sealing piece, and a through-hole is opened on the vertical support rod. A booster fan is provided on one side of the first supporting frame, and one end of a ventilation pipe is fixedly installed on the air outlet port of the booster fan, and the other end of the ventilation pipe extends into the through-hole and is connected with the through-thread head. A first bidirectional screw is rotatably installed in the first supporting frame, and two first push rods are threadedly installed on the first bidirectional screw The movable plate, the bottoms of the two first sliding plates extend to the bottom of the first supporting frame and are slidably connected to the bottom of the first supporting frame, the bottoms of the two first sliding plates are fixedly installed with hinged seats, the bottoms of the two hinged seats are hinged with side cover plates, and the sides of the two side cover plates close to each other are fixedly installed with side sealing pieces, and both sides of the first supporting frame are provided with mounting plates, the sides of the two mounting plates close to each other are threaded with solid threaded heads, and the ends of the two solid threaded heads close to each other are fixedly installed with longitudinal cover plates, and the sides of the two longitudinal cover plates close to each other are fixedly installed with longitudinal sealing pieces; A bottom support that can move up and down is provided below the first carrying frame; The bottom of the bottom bracket is fixedly installed with a concave base, and a through cavity is opened on the concave base, and the same third bidirectional screw is rotatably installed on the inner walls of both sides of the through cavity, and two transverse support plates are threadedly installed on the third bidirectional screw. A first U-shaped rod is slidably installed on both sides of the concave base, and the bottom ends of the two first U-shaped rods are respectively fixedly connected to the two transverse support plates, and the top ends of the two first U-shaped rods are fixedly installed with transverse correction plates. Two longitudinal supports are fixedly installed in the through cavity, and the two longitudinal supports are fixedly installed on The same fourth bidirectional screw is rotatably installed, and two longitudinal support plates are threadedly installed on the fourth bidirectional screw, and a second U-shaped rod is slidably installed on the two longitudinal supports, and the bottom ends of the two second U-shaped rods are respectively fixedly connected to the two longitudinal support plates, and the top ends of the two second U-shaped rods are fixedly installed with longitudinal correction plates, and the transverse correction plates and the longitudinal correction plates are both located above the base, and a plurality of movable balls are inlaid on the side where the two transverse correction plates are close to each other and the side where the two longitudinal correction plates are close to each other; The base is provided with four long sliding openings distributed in a circular array, and the bottoms of the two transverse correction plates and the two longitudinal correction plates are fixedly installed with linkage folding strips, and a lifting screw is rotatably installed at the bottom of the recess of the concave base, and a cross connecting strip is threadedly installed on the lifting screw, and the top of the cross connecting strip is fixedly installed with a cross sliding rod, and four lifting columns distributed in a circular array are slidably installed on the cross sliding rod, and the top of the lifting column is set to a spherical surface. The tops of the four lifting columns respectively pass through the four linkage folding strips and are slidably connected to the corresponding linkage folding strips, the bottom end of the lifting screw extends into the through cavity and is fixedly installed with a first bevel gear, and a connecting shaft is rotatably installed on one side of the concave base, one end of the connecting shaft extends into the through cavity and is fixedly installed with a second bevel gear, and the first bevel gear is meshed with the second bevel gear.

2. The air tightness detection device for an air compressor crankcase according to claim 1, characterized in that: The vertical lifting assembly includes a hollow support, which is arranged on one side of the immersion tank, and the side of the hollow support close to the immersion tank is set as an opening, a vertical screw is rotatably installed in the hollow support, a vertical sliding arm is threadedly installed on the vertical screw, one side of the vertical sliding arm is fixedly connected to the first supporting frame, the bottom of the booster fan is fixedly connected to the top of the vertical sliding arm, a first servo motor is fixedly installed on the top of the hollow support, the output shaft of the first servo motor is fixedly connected to the top of the vertical screw, a second servo motor is fixedly installed on the outer wall of one side of the first supporting frame, and the output shaft of the second servo motor is fixedly connected to one end of the first bidirectional screw.

3. The air tightness detection device for the crankcase of an air compressor according to claim 2, characterized in that: Bosses are fixedly installed on both sides of the two hinged seats, arc angle rulers are slidably installed on the two bosses, the bottoms of the two arc angle rulers are fixedly connected to the two side cover plates respectively, and tightening screws are threadedly installed on the two bosses, and the two tightening screws respectively conflict with the two arc angle rulers.

4. The air tightness detection device for an air compressor crankcase according to claim 3, characterized in that: A slide is fixedly installed on the top of the first carrying frame, an adjusting screw is threadedly installed on the top of the slide, and an opening frame is rotatably installed on the bottom end of the adjusting screw. Both sides of the open frame are slidingly connected to both sides of the slide respectively, and a second bidirectional screw is rotatably installed in the open frame, and two adjusting plates are threadedly installed on the second bidirectional screw, and longitudinal supporting plates are fixedly installed on the bottom of the two adjusting plates. The tops of the two mounting plates are fixedly connected to the two longitudinal supporting plates respectively, and a third servo motor is fixedly installed on the outer wall of one side of the open frame, and the output shaft of the third servo motor is fixedly connected to one end of the second bidirectional screw.

5. The air tightness detection device for an air compressor crankcase according to claim 4, characterized in that: Two U-shaped support rods are fixedly installed on the top of the base, the first supporting frame is located inside the two U-shaped support rods, and two first telescopic cylinders are fixedly installed on the top of the first supporting frame. The output shafts of the two first telescopic cylinders are respectively fixedly connected to the two U-shaped support rods.

6. The air tightness detection device for an air compressor crankcase according to claim 2, characterized in that: A support platform is fixedly installed on the outer wall of one side of the immersion pool away from the hollow support, and a drying box is fixedly installed on the top of the support platform, and a shuttle port and two air vents are opened on the top of the drying box. A hot air blower is fixedly installed on one side of the drying box, and the air outlet port of the hot air blower extends into the drying box. A rodless cylinder is fixedly installed on the bottom of the support platform, and a vertical rod is fixedly installed on the slider of the rodless cylinder. The top of the vertical rod passes through the support platform and the drying box and is slidably connected to the two. The top of the vertical rod extends to the top of the drying box and is fixedly installed with a placing table. A mounting arm is provided above the drying box, and a second telescopic cylinder is fixedly installed on the top of the mounting arm. The output shaft of the second telescopic cylinder passes through the mounting arm and is slidably connected to the mounting arm. A mounting frame is fixedly installed, a connecting rod is rotatably installed at the bottom of the mounting frame, and a second supporting frame is fixedly installed at the bottom end of the connecting rod, a fifth servo motor is fixedly installed in the mounting frame, and the output shaft of the fifth servo motor is fixedly connected to the top end of the connecting rod, a fifth bidirectional screw is rotatably installed in the second supporting frame, and two second push plates are threadedly installed on the fifth bidirectional screw, and the bottoms of the two second push plates extend to the bottom of the second supporting frame and are slidably connected to the bottom of the second supporting frame, and the bottoms of the two second push plates are fixedly installed with connecting folding plates, and the bottoms of the two connecting folding plates are fixedly installed with panels, and the bottoms of the two panels are fixedly installed with two third telescopic cylinders, and the output shafts of the four third telescopic cylinders are fixedly installed with clamping plates.

7. The air tightness detection device for an air compressor crankcase according to claim 6, characterized in that: A vertical plate is fixedly installed on the top of the support platform, one side of the mounting arm is fixedly connected to the vertical plate, an avoidance opening is opened on the vertical plate, the drying box passes through the avoidance opening, and a fourth servo motor is fixedly installed on the outer wall of one side of the second supporting frame, and the output shaft of the fourth servo motor is fixedly connected to one end of the fifth bidirectional screw.

8. A method for detecting the air tightness of an air compressor crankcase using the air tightness detection device according to claim 5, characterized in that: T1. Place the crankcase: Place the crankcase to be tested on the bottom support. First, rotate the third bidirectional screw, then the fourth bidirectional screw. Use two transverse and two longitudinal correction pieces to position the crankcase in the center directly below the upper annular cover. T2. Lift the crankcase: Turn the connecting shaft clockwise, the lifting screw starts to rotate, and the four lifting columns start to rise. Use the four lifting columns to lift the crankcase; T3. Replace the through-hole seals; unscrew the through-hole upper cover and longitudinal cover, unscrew the through-hole thread heads and solid thread heads, take out the upper annular seal and longitudinal seal of corresponding sizes, and screw the through-hole thread heads and solid thread heads on them into the vertical support rods and mounting plate respectively; T4. Adjust the height of the longitudinal sealing sheet and the tilt angle of the side sealing sheet: Turn the adjustment screw, and the opening frame will lower the longitudinal support plate and the longitudinal sealing sheet, and finally adjust the longitudinal sealing sheet to the specified height; Tighten the two screws, move the two side covers, and after adjusting the two side covers to the specified angle, tighten the two screws. T5. Seal the crankcase through-holes. The output shafts of the two first telescopic cylinders are activated to extend, raising the bottom support. When the top of the crankcase contacts the upper annular sealing plate, the first telescopic cylinders are closed. The third servo motor is activated in the positive direction, and the two adjustment plates move toward each other, attaching the two longitudinal sealing plates to the front and rear sides of the crankcase to seal the through-holes. The second servo motor is activated in the positive direction, and the two first push plates move toward each other, using the two side sealing plates to block the through-holes on the oblique sides of the crankcase. T6. Air tightness test: Start the first servo motor in the forward direction, and the vertical slide arm will lower the first load-bearing frame, immerse the crankcase in the immersion tank, start the booster fan, and the booster fan will pass the gas into the crankcase. At this time, observe the inside of the immersion tank. If there are bubbles, it means that the crankcase is unqualified, otherwise it is qualified.

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