Engine air tightness detection device

Abstract

The utility model relates to the technical field of engine detection equipment, and discloses an engine air tightness detection device, which comprises a detection table, a controller, a detection water tank and a plugging mechanism, the plugging mechanism comprises side plugging structures located in front, back, left and right directions, and a press-fitting plugging structure and a bottom plugging structure which are located in up and down directions; the side plugging structures are fixed on the side wall of the detection water tank; a vertical fixing frame is arranged on the detection table, the press-fitting plugging structure comprises a press-fitting head and a press-fitting air cylinder installed on the fixing frame, a sliding assembly is arranged in the detection water tank, a connecting frame is arranged on the press-fitting head, the press-fitting head is connected with the sliding assembly through the connecting frame, and the bottom plugging structure comprises a supporting outer plate and a supporting inner plate. The supporting inner plate is embedded in the supporting outer plate, the supporting inner plate and the supporting outer plate are not in contact, the supporting outer plate is fixed to the sliding assembly, and the supporting inner plate is fixedly connected with the detection water tank. In practical application, the detection precision and the detection efficiency of the engine cylinder block are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine detection equipment, and particularly relates to an airtightness detection device for an engine. Background Technique

[0002] As the power supply structure of a vehicle, the airtightness of the engine cylinder block is directly related to the sealing state of the internal combustion chamber of the engine. Good sealing is the basis for maintaining normal combustion pressure, improving fuel efficiency and engine output power. Therefore, it is very necessary to detect the airtightness of the cylinder block before leaving the factory.

[0003] At present, the airtightness of engine cylinder blocks on the market is usually detected by an airtightness detector. The specific detection principle is to connect and seal the cylinder block with the airtightness detector and inject gas to make the inside of the cylinder block enter a pressure stabilization stage. Then, the airtightness detector monitors the change of pressure inside the cylinder block through a highly sensitive pressure sensor or flow sensor and outputs the detection result. However, the airtightness detector and the engine cylinder block usually need to be manually positioned and docked, which not only takes a long time for docking, but also has poor docking accuracy and is likely to affect the airtightness detection accuracy of the engine. Content of the Utility Model

[0004] The utility model aims to provide an airtightness detection device for an engine to improve the detection accuracy and detection efficiency of the engine cylinder block.

[0005] To achieve the above object, the utility model adopts the following technical scheme: an airtightness detection device for an engine, including a detection table, a detection water tank and a plugging mechanism arranged on the detection table. The detection water tank is filled with water by a water pump; the plugging mechanism includes side plugging structures located in the front, rear, left and right directions, a pressing and plugging structure and a bottom plugging structure located in the up and down directions. An engine cylinder block is placed between the pressing and plugging structure and the bottom plugging structure. The side plugging structures are all fixed on the side walls of the detection water tank; a vertical fixing frame is arranged on the detection table. The pressing and plugging structure includes a pressing head and a pressing cylinder installed on the fixing frame. The pressing head is fixed at the end of the output shaft of the pressing cylinder. A sliding component is arranged in the detection water tank. A connecting frame is arranged on the pressing head and is connected with the sliding component through the connecting frame. The bottom plugging structure includes a supporting outer plate and a supporting inner plate. An assembly hole is opened on the supporting outer plate. The supporting inner plate has the same shape as the assembly hole and is embedded in the assembly hole, and the size ratio of the assembly hole is larger than that of the supporting inner plate. The supporting outer plate is fixed on the sliding component, and the supporting inner plate is fixedly connected with the detection water tank; an inflation head is arranged at the bottom of the bottom plugging structure.

[0006] The principle and advantages of this scheme are:

[0007] In actual application, the support outer plate of the bottom plugging structure in this solution is driven by a pressing cylinder and a sliding assembly to move to the front side of the detection water tank and be flush with the upper part of the detection water tank. Then, an engine block is placed on the support outer plate by manual or robotic feeding. The pressing cylinder and the sliding assembly drive the support outer plate and the engine block to reset, so that the engine block is fixed on the support inner plate and the bottom is plugged by a gasket. Then, the pressing plugging structure and the four-sided side plugging structure comprehensively plug the engine block. Then, water is injected into the detection water tank to completely submerge the engine block. Then, an external air pump inflates the inside of the engine block through an inflation head until the air pressure inside the block is balanced; then, observe whether there are continuous bubbles in the water to judge the airtightness of the engine block.

[0008] 1. In this solution, the engine block realizes automatic docking and plugging under the cooperation of the side plugging structures and the pressing plugging structure in the front, back, left, and right four directions. Compared with the manual docking in the existing detection process, this solution not only greatly reduces the time for docking adjustment, but also can quickly and accurately determine the final detection position under the common extrusion of the four-sided side plugging structures and be comprehensively plugged by the plugging mechanism. The overall speed and accuracy of docking and plugging are improved, making the detection process efficient and highly accurate. At the same time, the automated plugging and pressing process reduces the operation risk due to the reduction of manual operations, making the detection process safer and more controllable.

[0009] 2. In this solution, the engine block is completely immersed in water for airtightness detection. Gas leakage inside the block will quickly form visible bubbles in the water, providing an intuitive leakage indication. Compared with measuring changes depending on high-precision pressure sensors or flow sensors in a waterless environment, this solution accelerates the detection process, facilitates the preliminary positioning of the leakage area, and effectively improves the detection efficiency; at the same time, the high surface tension of water helps to detect minute leaks caused by surface defects or improper assembly, which is beneficial to testing the overall sealability.

[0010] 3. In this solution, the bottom plugging structure is designed as a support outer plate and a support inner plate that are mutually embedded but not in contact. The support outer plate is connected to the pressing plugging structure through a connecting frame and a sliding assembly, and jointly cooperates with the pressing cylinder and the sliding assembly to act as a transfer and transportation structure for the engine block in the detection water tank, effectively reducing the detection difficulty increased due to the limited space of the detection water tank and the restricted operation of workers or robots, and further improving the overall detection efficiency.

[0011] Further, a first guiding component is provided between the pressing head and the fixed frame. The first guiding component includes a sliding seat and a vertical sliding rail installed on the fixed frame. The sliding seat is L-shaped. One side of the sliding seat is slidably connected to the vertical sliding rail, and the other side is fixed to the connecting frame. The first guiding component ensures the stability of the pressing head during the lifting process and improves the docking and sealing accuracy.

[0012] Furthermore, a support base is fixed inside the detection water tank, and the support inner plate is bolted to the support base. This facilitates the replacement of the support inner plate and even the bottom sealing structure according to engine blocks of different models and specifications, making the detection device applicable to engine blocks of multiple specifications and models.

[0013] Furthermore, the sliding assembly includes a transverse slide rail and a sliding cylinder slidably connected to the transverse slide rail, and the support outer plate is detachably fixed to the sliding cylinder. This facilitates the replacement of the support outer plate and even the bottom sealing structure according to engine blocks of different models and specifications, making the detection device applicable to engine blocks of multiple specifications and models.

[0014] Furthermore, each side sealing structure includes a sealing cylinder and a sealing head. The end of the output shaft of the sealing cylinder is detachably connected with a connecting plate, and the sealing head is mounted on the connecting plate; the pressing head includes a pressing plate and a pressing column, and the pressing column is detachably fixed to the pressing plate. The above settings facilitate the replacement of the positions of the encapsulation head and the pressing column according to the holes at different positions on engine blocks of different specifications and models, enabling the detection device to perform airtightness detection on engine blocks of multiple models and improving the versatility of the equipment.

[0015] Furthermore, a plurality of L-shaped positioning braces are provided on the support outer plate, and the plurality of positioning braces enclose a placement area for the engine block. Two positioning pins are provided on the diagonal line of the support inner plate. The functions of the positioning braces and the positioning pins are both to achieve quick and accurate positioning and installation of the engine block, shortening the overall detection time.

[0016] Furthermore, the two positioning pins on the support inner plate are respectively a cylindrical pin and a diamond pin. One of the positioning pins being a diamond pin can effectively reduce the requirements for the positioning accuracy between the positioning pin and the engine block, thereby reducing the machining accuracy requirements for the engine block and reducing the machining cost.

[0017] Furthermore, a positioning assembly is provided between the bottom of the support outer plate and the connecting frame. The positioning assembly includes a positioning block and a guide rod. The bottom of the positioning block is slidably connected to the guide rod, and a positioning hole matching the positioning block is opened on the side of the support outer plate. This facilitates quickly determining the installation position when replacing the support outer plate.

[0018] Furthermore, second guiding components are symmetrically provided on both sides of the connecting frame. The second guiding components include a guide rail and a guide roller respectively fixed on the connecting frame and the fixed frame. The cross-section of the guide rail is hemispherical, and the guide rail is located in the middle groove of the guide roller. The cooperation of the second guiding component and the first guiding component further improves the stability of the pressing head during the lifting and docking process.

[0019] Furthermore, a depth sensor for controlling the water level is provided at the top of the detection water tank, and the depth sensor is connected to the water pump. Description of the Drawings

[0020] Figure 1 Schematic diagram of the overall structure of the detection device Figure 1 .

[0021] Figure 2 Schematic diagram of the overall structure of the detection device Figure 2 .

[0022] Figure 3 Partial enlarged view of the first guiding component and the second guiding component.

[0023] Figure 4 Front view of the detection device

[0024] Figure 5 Schematic diagram of the connecting frame and the bottom plugging structure Figure 1 .

[0025] Figure 6 Structure schematic diagram of the sliding component

[0026] Figure 7 Schematic diagram of the connecting frame and the bottom plugging structure Figure 2 .

[0027] Figure 8 For Figure 7 Partial enlarged view of part A in Specific implementation mode

[0028] The following is a further detailed description through specific implementation modes:

[0029] The reference signs in the accompanying drawings of the specification include: detection table 1, detection water tank 2, press-fitting plugging structure 3, press-fitting cylinder 31, press-fitting head 32, press-fitting plate 321, press-fitting column 322, side plugging structure 4, plugging cylinder 41, plugging head 42, connecting plate 43, bottom plugging structure 5, support outer plate 51, assembly hole 511, positioning brace 512, positioning hole 513, support inner plate 52, sealing gasket 521, cylindrical pin 522, diamond pin 523, fixing frame 6, connecting frame 7, sliding component 8, horizontal slide rail 81, sliding cylinder 82, first guiding component 9, vertical slide rail 91, sliding seat 92, second guiding component 10, guide rail 101, guiding roller 102, positioning component 11, positioning block 111, guiding rod 112, depth sensor 12, support seat 13, inflation head 14.

[0030] The embodiment is basically as shown in the appendix Figures 1 - 8As shown: A device for detecting the airtightness of an engine, comprising a detection table 1, a detection water tank 2 and a plugging mechanism arranged on the detection table 1. The detection water tank 2 is filled with water by a water pump, and a drain port is provided at the bottom of the detection water tank 2; The plugging mechanism includes side plugging structures 4 located in the front, rear, left and right directions, a pressing and plugging structure 3 and a bottom plugging structure 5 located in the up and down directions. An engine cylinder block is placed between the pressing and plugging structure 3 and the bottom plugging structure 5, and the side plugging structures 4 are all fixed on the side walls of the detection water tank 2; As Figure 7 shown, an inflation head 14 is provided at the bottom of the bottom plugging structure 5. After the engine cylinder block is placed and fixed, the inflation head 14 extends into the engine cylinder block, and the other end of the inflation head 14 is connected to an air pump outward.

[0031] As Figure 1 、 Figure 2 and Figure 4 shown, a vertical fixing frame 6 is provided on the detection table 1. The pressing and plugging structure 3 includes a pressing head 32 and a pressing cylinder 31 installed on the fixing frame 6. The pressing head 32 is fixed at the end of the output shaft of the pressing cylinder 31. The pressing head 32 includes a pressing plate 321 and multiple pressing columns 322. The pressing columns 322 are bolted to the pressing plate 321, and the installation positions of the pressing columns 322 on the pressing plate 321 are designed according to the engine cylinder block to be actually detected; Each side plugging structure 4 includes a plugging cylinder 41 and a plugging head 42. A connecting plate 43 is bolted to the end of the output shaft of the plugging cylinder 41, and the plugging head 42 is installed on the connecting plate 43. The installation position of the plugging head 42 on the connecting plate 43 is also designed according to the engine cylinder block to be actually detected. As Figure 5 、 Figure 6 shown in combination, a sliding assembly 8 is provided in the detection water tank 2. A connecting frame 7 is installed on the pressing head 32 and is connected to the sliding assembly 8 through the connecting frame 7. The sliding assembly 8 includes a sliding cylinder 82 and a horizontal slide rail 81 fixed to the bottom of the connecting frame 7. The sliding cylinder 82 is slidably connected to the horizontal slide rail 81; As Figure 7 、 Figure 8 shown in combination, the bottom plugging structure 5 includes a support outer plate 51 and a support inner plate 52. An assembly hole 511 is opened on the support outer plate 51. The support inner plate 52 has the same shape as the assembly hole 511 and is embedded in the assembly hole 511, and the size ratio of the assembly hole 511 is larger than that of the support inner plate 52. A sealing gasket 521 is embedded and installed on the upper surface of the support inner plate 52. The sealing gasket 521 cooperates with the hole channels at the bottom of the engine cylinder block to achieve bottom sealing; The support outer plate 51 is bolted to the sliding cylinder 82, and a support seat 13 is provided in the detection water tank 2. The support inner plate 52 is bolted to the support seat 13.

[0032] Through the above detachable design, each plugging structure can replace the pressing head 32 or the plugging head 42 according to the shape, appearance and channel position of the engine block to be detected as required, so as to ensure the overall sealing of the engine block by the plugging mechanism. At the same time, the detection device can also be used for the airtightness detection of engine blocks of various models and specifications, improving the practicability and versatility of the detection device.

[0033] As Figure 8 shown, a plurality of L-shaped positioning braces 512 are provided on the support outer plate 51. The plurality of positioning braces 512 enclose a placement area for the engine block. The tops of the positioning braces 512 are all inclined towards the inner wall of the detection water tank 2, so that the upper end of the placement area enclosed by each positioning brace 512 has a tendency to expand outwards. When the engine housing is placed, it can gradually slide down along the inclined part of the positioning brace 512 to the accurate position. In this way, it is convenient to increase the error tolerance rate during the placement process of the engine block and reduce the assembly requirements; on the support inner plate 52, two positioning pins are provided on its diagonal line. One of the two positioning pins is a cylindrical pin 522, and the other is a diamond pin 523. One of them, the diamond pin 523, can effectively reduce the requirements for the positioning accuracy between the positioning pin and the engine block, thereby reducing the machining accuracy requirements for the engine block and reducing the machining cost.

[0034] As Figure 2 、 Figure 3 Combined with the figure shown, a first guiding component 9 and a second guiding component 10 are provided between the pressing head 32 and the fixing frame 6. The first guiding component 9 includes a sliding seat 92 and a vertical slide rail 91 installed on the fixing frame 6. The sliding seat 92 is L-shaped. One side of the sliding seat 92 is slidably connected to the vertical slide rail 91, and the other side is fixed to the connecting frame 7; the second guiding component 10 is symmetrically arranged on both sides of the connecting frame 7. The second guiding component 10 includes a guide rail 101 and a guide roller 102 respectively fixed on the connecting frame 7 and the fixing frame 6. The cross-section of the guide rail 101 is hemispherical, and the guide rail 101 is located in the middle groove of the guide roller 102. The cooperation of the first guiding component 9 and the second guiding component 10 effectively improves the stability of the pressing head 32 during the lifting process and improves the docking sealing accuracy.

[0035] As Figure 7 shown, a positioning component 11 is provided between the support outer plate 51 and the bottom of the connecting frame 7. The positioning component 11 includes a positioning block 111 and a guide rod 112. The bottom of the positioning block 111 is slidably connected to the guide rod 112, and a positioning hole 513 matching the positioning block 111 is opened on the side of the support outer plate 51; this facilitates quickly determining the installation position when replacing the support outer plate 51.

[0036] As Figure 2As shown in the figure, a depth sensor 12 for controlling the water level is provided at the top of the detection water tank 2. The depth sensor 12 is connected to the water pump, which can ensure that the engine block is completely immersed in water without wasting water resources.

[0037] The specific implementation process is as follows:

[0038] During specific operation, the support outer plate 51 of the bottom plugging structure 5 is driven by the pressing cylinder 31 and the sliding assembly 8 to move to the front side of the detection water tank 2 and be flush with the upper part of the detection water tank 2. Then, the engine block is placed in the placement area surrounded by the positioning supports 512 on the support outer plate 51 by manual or robotic loading. Then, the pressing cylinder 31 and the sliding assembly 8 drive the support outer plate 51 and the engine block to reset, so that the engine block is fixed on the support inner plate 52 and the bottom of the engine block is plugged by the gasket 521. Then, the pressing plugging structure 3 and the four-sided side plugging structure 4 comprehensively plug the engine block. Then, water is injected into the detection water tank 2 to completely submerge the engine block. Then, an external air pump inflates the inside of the engine block through the inflation head 14 until the air pressure inside the block is balanced. Then, observe whether there are continuous bubbles in the water to judge the airtightness of the engine block.

[0039] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. An airtightness detection device for an engine, characterized in that: It includes a detection table, a detection water tank and a plugging mechanism arranged on the detection table. The detection water tank is filled with water by a water pump; the plugging mechanism includes side plugging structures located in the front, rear, left and right directions, a press-fitting plugging structure and a bottom plugging structure located in the up and down directions. An engine block is placed between the press-fitting plugging structure and the bottom plugging structure. The side plugging structures are all fixed on the side walls of the detection water tank; a vertical fixing frame is provided on the detection table. The press-fitting plugging structure includes a press-fitting head and a press-fitting cylinder installed on the fixing frame. The press-fitting head is fixed at the end of the output shaft of the press-fitting cylinder. A sliding assembly is arranged in the detection water tank. A connecting frame is provided on the press-fitting head and is connected to the sliding assembly through the connecting frame. The bottom plugging structure includes a support outer plate and a support inner plate. An assembly hole is formed in the support outer plate. The support inner plate has the same shape as the assembly hole and is embedded in the assembly hole, and the size ratio of the assembly hole is larger than that of the support inner plate. A sealing gasket is embedded and installed on the upper surface of the support inner plate. The support outer plate is fixed on the sliding assembly, and the support inner plate is fixedly connected to the detection water tank; an inflation head is provided at the bottom of the bottom plugging structure.

2. The airtightness detection device for an engine according to claim 1, wherein: A first guiding assembly is arranged between the press-fitting head and the fixing frame. The first guiding assembly includes a sliding seat and a vertical sliding rail installed on the fixing frame. The sliding seat is L-shaped. One side of the sliding seat is slidably connected to the vertical sliding rail, and the other side is fixed to the connecting frame.

3. The airtightness detection device for an engine according to claim 2, wherein: A support seat is fixed in the detection water tank, and the support inner plate is bolted to the support seat.

4. The airtightness detection device for an engine according to claim 3, wherein: The sliding assembly includes a horizontal sliding rail and a sliding cylinder slidably connected to the horizontal sliding rail. The support outer plate is detachably fixed to the sliding cylinder.

5. A device for detecting the airtightness of an engine according to claim 1, characterized in that: Each side plugging structure includes a plugging cylinder and a plugging head. A connecting plate is detachably connected to the end of the output shaft of the plugging cylinder, and the plugging head is installed on the connecting plate; the press-fitting head includes a press-fitting plate and a press-fitting column, and the press-fitting column is detachably fixed to the press-fitting plate.

6. The airtightness detection device for an engine according to claim 4, characterized in that: A plurality of L-shaped positioning braces are provided on the support outer plate. The plurality of positioning braces enclose a placement area for the engine block. Two positioning pins are provided on the diagonal line of the support inner plate.

7. The airtightness detection device for an engine according to claim 6, characterized in that: The two positioning pins on the support inner plate are a cylindrical pin and a diamond pin respectively.

8. The airtightness detection device for an engine according to claim 7, characterized in that: A positioning assembly is arranged between the bottom of the support outer plate and the bottom of the connecting frame. The positioning assembly includes a positioning block and a guiding rod. The bottom of the positioning block is slidably connected to the guiding rod, and a positioning hole matching the positioning block is formed in the side of the support outer plate.

9. The airtightness detection device for an engine according to claim 8, wherein: Second guiding assemblies are symmetrically arranged on both sides of the connecting frame. The second guiding assemblies include guide rails and guiding rollers respectively fixed on the connecting frame and the fixing frame. The cross-section of the guide rail is hemispherical, and the guide rail is located in the middle groove of the guiding roller.

10. The airtightness detection device for an engine according to claim 9, characterized in that: A depth sensor for controlling the water level is provided at the top of the detection water tank, and the depth sensor is connected to the water pump.

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