Air tightness testing device using air cylinder

Abstract

The present application provides an air tightness detection device using a cylinder, which is used to detect the air tightness of an engine. The engine includes a main body and a barrel arranged in the horizontal direction on the main body, the barrel is penetrated by a first through hole, and the main body is provided with a second through hole connected to the inner cavity of the engine in the vertical direction. The air tightness detection device also includes: a bottom plate, a pressing mechanism, a blocking mechanism and a locking mechanism; the present application replaces the hydraulic cylinder in the prior art by combining the cylinder and the locking mechanism, thereby avoiding the problem of large volume and heavy weight of the existing hydraulic cylinder, and ensuring the stroke and accuracy of the pressing mechanism. And by setting a push rod and a sliding assembly, the first blocking rod is driven by the movement of the cylinder in the vertical direction to fill the vertical hole position of the engine, and the sliding assembly is pushed by the push rod to synchronously block the hole position on the side of the engine, thereby avoiding the cumbersome operation of manually blocking the holes on the engine one by one when testing the air tightness of a specific engine.

Description

Technical Field

[0001] The present application relates to the technical field of air tightness detection, and in particular to an air tightness detection device using a cylinder. Background Art

[0002] An engine usually refers to an internal combustion engine or an electric motor, which is a device that converts the chemical energy or electrical energy of fuel into mechanical energy. Therefore, the engine often forms a combustion chamber inside to be in contact with high-temperature and high-pressure fuel gas. It needs to withstand a large thermal and mechanical load, so its own air tightness requirements are very high. When the engine has air tightness problems and causes air leakage, very serious safety problems will arise.

[0003] In the prior art, when measuring the air tightness of an engine, as in the patent application document CN214748656U, the engine is usually placed on a test bench and clamped by a positioning device. Then the engine is heated and pressurized, and the air tightness of the engine is tested by an air pressure detection device to measure the air tightness of the engine. Or in the patent application document CN109357821 B, a support device is provided at the bottom of the ventilation detection seat, a side clamping device is provided on the side, and a ventilation detection device is provided on the top, so that when the engine is placed on the ventilation detection part, the holes on the engine are blocked by the support device, the side clamping device and the upper ventilation detection device, and then an inflation detection test is performed to test the air tightness of the engine. In this scheme, the driving mechanism uses a cylinder to realize the lifting and lowering of the upper pressure plate. Compared with the hydraulic cylinder, the cylinder has a larger stroke, but when the clamp is accurately sealed and the internal high-pressure gas is impacted, it is easy to loosen and affect the air tightness detection.

[0004] In summary, the above patent application documents and the corresponding prior art usually require that all the holes on the top, bottom, left and right sides of the engine be blocked manually or with a positioning blocking mechanism of corresponding precision before an air tightness test is performed. In addition, during the air tightness test of the engine, high-pressure gas is usually injected into the holes outside the engine first, and the leakage or pressure difference of the high-pressure gas in the engine is detected to determine whether the engine has leakage or unstable air tightness. Since the high-pressure gas is filled into the engine, in order to ensure the sealing of the clamp to ensure the accuracy of the test, the upper pressure plate of the existing air tightness test device is generally driven by a hydraulic cylinder, and the hydraulic cylinder is heavy and has a short stroke. If the upper pressure plate is driven by the hydraulic cylinder to block the holes above the engine, the size and stroke of the hydraulic cylinder need to be further increased, thereby increasing the size and weight of the overall equipment. If the hydraulic cylinder is replaced with other driving mechanisms, such as a cylinder, it is often difficult to ensure the tightness of the blocking of the holes on the upper part of the engine. For specific engines with more holes on the top, bottom, left and right sides, it is often necessary to equip the equipment with a variety of side clamping devices of different styles to block the holes on the sides of the engine, resulting in difficulty in plugging the holes during the plugging process before the engine air tightness test. Summary of the invention

[0005] In view of this, it is necessary to provide an air tightness detection device using an air cylinder that can avoid the use of a hydraulic cylinder and can ensure that the upper, lower, left and right holes of the engine are blocked to solve the above problems.

[0006] The embodiment of the present application provides an air tightness detection device using a cylinder, which is used to detect the air tightness of an engine. The engine includes a main body and a barrel portion arranged on the main body in a horizontal direction, the barrel portion is penetrated by a first through hole, and the main body is provided with a second through hole connected to the engine inner cavity in a vertical direction. The air tightness detection device also includes:

[0007] Base plate;

[0008] The pressing mechanism comprises a cylinder, a pressing plate assembly arranged on the cylinder output shaft, and a push rod and a first blocking rod arranged on the lower bottom surface of the pressing plate assembly, wherein the pressing plate assembly and the bottom plate enclose a housing chamber for housing the engine;

[0009] A blocking mechanism, comprising a blocking member and a sliding assembly, wherein the blocking member blocks one end of the first through hole, and the sliding assembly comprises a pushing portion, a sliding portion and a blocking portion which are arranged in sequence, wherein the pushing portion is arranged opposite to the blocking member, the sliding member is arranged through the engine, and the blocking portion is arranged opposite to the other end of the first through hole;

[0010] A locking mechanism is fixed on the bottom plate, and the locking mechanism has a supporting groove for supporting the lower pressure plate assembly;

[0011] Among them, when the cylinder drives the lower pressure plate assembly to abut against the abutting groove, the first blocking rod is blocked in the second through hole, and the pushing rod pushes the pushing part to drive the sliding part and the blocking part to move to block the first through hole, which is used to transmit the driving force of the cylinder in the vertical direction to the horizontal direction through the pushing rod and the blocking mechanism.

[0012] In at least one embodiment of the present application, the lower pressing plate assembly includes a lower pressing plate member and a connecting assembly provided on the lower pressing plate member;

[0013] The connecting assembly comprises a first plate, a second plate and a connecting shaft arranged on the lower pressing plate, the first plate and the second plate are arranged in parallel, two ends of the connecting shaft are respectively fixed to the first plate and the second plate, and the lower pressing plate is provided with a receiving opening;

[0014] The locking mechanism includes a height adjusting member and a locking assembly arranged on the height adjusting member, the retaining groove is arranged on the locking assembly, and the locking assembly extends into the accommodating port, and is used to drive the connecting shaft to be clamped in the retaining groove when the cylinder drives the lower pressure plate assembly to be pressed downward.

[0015] In at least one embodiment of the present application, the locking assembly includes a housing and a first locking member and a second locking member disposed in the housing;

[0016] The shell includes a connecting portion and a locking portion arranged on the connecting portion, the supporting groove is opened on the locking portion, and the locking portion is provided with a first locking groove and a second locking groove along its width direction, the first locking member can be rotatably arranged in the first locking groove, and the second locking member can be rotatably arranged in the second locking groove.

[0017] In at least one embodiment of the present application, a first semicircular groove is formed on the first locking member, and a second semicircular groove is formed on the second locking member, and the first semicircular groove and the second semicircular groove are used to enclose each other to lock the connecting shaft;

[0018] Among them, the first locking piece has a first inclined surface connected to the first semicircular groove, the second locking piece has a second inclined surface connected to the second semicircular groove, and the airtightness detection equipment also includes a clamping piece, which can extend into and abut against the first inclined surface and the second inclined surface to clamp the first locking piece and the second locking piece.

[0019] In at least one embodiment of the present application, the contact area between the first bevel, the second bevel and the clamping member is 10 square centimeters, and the butt angle between the first bevel and the second bevel is θ, wherein 5°≤θ≤15°.

[0020] In at least one embodiment of the present application, a butt angle θ between the first bevel and the second bevel is 10°.

[0021] In at least one embodiment of the present application, an inclined column is further provided on the surface of the engine in the vertical direction, and a third through hole communicating with the inner cavity is provided on the inclined column;

[0022] The air tightness detection equipment also includes a second sealing rod, which also includes a fixed rod and a sealing block. The fixed rod is fixed to the lower bottom surface of the lower pressure plate assembly, and the sealing part is movably provided on the fixed rod, and is used for when the cylinder drives the lower pressure plate assembly to drive the second sealing rod to be pressed down, the sealing block moves on the fixed rod to seal into the third through hole on the inclined column.

[0023] In at least one embodiment of the present application, a sliding groove is provided on a side of the fixing rod facing the blocking block, and a sliding block is provided on a side of the blocking block facing the fixing rod. The sliding block is arranged in the sliding groove and is used for enabling the blocking block to move on the sliding groove to adjust the angle of the blocking block to fill the third through hole when the blocking block contacts the inclined column.

[0024] In at least one embodiment of the present application, the fixing rod further includes a stop plate, the stop plate blocks the slide groove, and a push hole is formed on the stop plate;

[0025] The second blocking rod also includes a pushing assembly, which includes a pushing block and a first spring. The pushing block is arranged in the slide groove and on the sliding block. The first spring is arranged in a direction perpendicular to the fixed rod facing the surface where the blocking block is located, and both ends are respectively arranged on the fixed rod and the pushing block, so that when the pushing block moves to face the pushing hole, the first spring pushes the pushing block to squeeze the blocking block into the third through hole of the inclined column.

[0026] In at least one embodiment of the present application, the second blocking rod also includes a second spring, the second spring is arranged in the slide groove, and the two ends of the second spring are respectively fixed on the slider and the push block, and is used to drive the push block to reset when the cylinder drives the upper pressure plate assembly and drives the blocking block away from the third through hole.

[0027] This application has at least the following beneficial effects:

[0028] 1. This application replaces the hydraulic cylinder in the prior art by combining the cylinder and the locking mechanism, thus avoiding the problem of the existing hydraulic cylinder being large in size and heavy in weight, and ensuring the stroke and precision of the pressing mechanism. In addition, by setting a push rod and a sliding assembly, the cylinder moves in the vertical direction to drive the first blocking rod to fill the vertical hole of the engine, while the push rod pushes the sliding assembly to synchronously block the hole on the side of the engine, thereby avoiding the tedious operation of manually blocking the holes on the engine one by one during the air tightness test of the specific engine.

[0029] 2. The present application provides a first semicircular groove and a first inclined surface connected to the first semicircular groove on the first locking member, and provides a second semicircular groove and a second inclined surface connected to the second semicircular groove on the second locking member, so as to clamp the connecting shaft together. Preferably, by setting the butt angle between the first inclined surface and the second inclined surface to 5°≤θ≤15°, and making the contact area between the first inclined surface, the second inclined surface and the clamping member to be 10 square centimeters, and clamping the clamping member on the first inclined surface and the second inclined surface, the friction between the clamping member and the first inclined surface and the second inclined surface can resist the reverse force of the high-pressure gas injected into the engine, thereby ensuring the accuracy of engine positioning and the sealing of the holes on the engine, and improving the accuracy of detection.

[0030] 3. The present application sets a second blocking rod and divides the second blocking rod into a fixed rod and a blocking block, and sets a first spring and a pushing block, so that when the cylinder drives the pressing plate to press down so that the second blocking rod blocks the third through hole, the blocking block can move on the fixed rod to slide to the correct blocking position, and block the inclined column under the thrust of the first spring and the pushing block, thereby preventing the problem of low detection accuracy caused by poor sealing due to the difficulty in aligning the hole position of the inclined column on the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the three-dimensional structure of an air tightness detection device using a cylinder in one embodiment of the present application.

[0032] Figure 2 for Figure 1 The three-dimensional structure diagram of the airtightness detection equipment hidden behind the shell is shown.

[0033] Figure 3 for Figure 1 The three-dimensional structural schematic diagram of the engine from the first perspective is shown.

[0034] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the engine from a second perspective is shown.

[0035] Figure 5 for Figure 1The three-dimensional structural schematic diagram of the pushing rod, the first blocking rod, the engine and the blocking mechanism is shown.

[0036] Figure 6 for Figure 1 The three-dimensional structural schematic diagram of the pressing mechanism and the locking mechanism from the first perspective is shown.

[0037] Figure 7 for Figure 1 The three-dimensional structural schematic diagram of the pressing mechanism and the locking mechanism from a second perspective is shown.

[0038] Figure 8 for Figure 1 The three-dimensional structural schematic diagram of the locking mechanism shown.

[0039] Fig. 9 for Figure 6 The cross-sectional view of the locking mechanism shown is not engaged with the connecting shaft.

[0040] Fig.10 for Figure 6 The locking mechanism shown is a cross-sectional view when engaged with the connecting shaft.

[0041] Fig.11 for Figure 1 A schematic diagram of the three-dimensional structure of the engine and the second blocking rod is shown.

[0042] Fig.12 for Fig.11 A partially enlarged stereoscopic view of the second blocking rod is shown.

[0043] Fig.13 for Fig.11 The cross-sectional view shown is when the second blocking rod has not blocked the inclined column.

[0044] Fig.14 for Fig.11 The cross-sectional view shown is when the second blocking rod blocks the inclined column.

[0045] Main component symbols

[0046] 100. Air tightness testing equipment using a cylinder; 10. Bottom plate; 20. Pressing mechanism; 21. Cylinder; 22. Pressing plate assembly; 22a. Accommodating chamber; 221. Pressing plate member; 221a. Accommodating port; 222. Connecting assembly; 2221. First plate; 2222. Second plate; 2223. Connecting shaft; 23. Push rod; 24. First blocking rod; 30. Blocking mechanism; 31. Blocking member; 32. Sliding assembly; 321. Pushing part; 322. Sliding part; 323. Blocking part; 40. Locking mechanism; 40a. Abutting groove; 41. Height adjusting member; 42. Locking assembly; 421. Shell; 4211. Connecting part; 4212, locking part; 4212a, first locking groove; 4212b, second locking groove; 422, first locking member; 422a, first semicircular groove; 422b, first inclined surface; 422c, first self-rotating hole; 423, second locking member; 423a, second semicircular groove; 423b, second inclined surface; 423c, second self-rotating hole; 44, third spring; 50, clamping member; 60, second blocking rod; 61, fixing rod; 611, sliding groove; 612, stop plate; 612a, pushing hole; 62, blocking block; 621, sliding block; 63, pushing assembly; 631, pushing block; 632, first spring; 64, second spring;

[0047] 200, engine; 210, main body; 211, second through hole; 220, cylinder; 2201, first through hole; 230, inclined column; 231, third through hole. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0049] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0050] The embodiment of the present application provides an air tightness detection device using a cylinder, which is used to detect the air tightness of an engine. The engine includes a main body and a barrel portion arranged on the main body in a horizontal direction, the barrel portion is penetrated by a first through hole, and the main body is provided with a second through hole connected to the engine inner cavity in a vertical direction. The air tightness detection device also includes:

[0051] Base plate;

[0052] The pressing mechanism comprises a cylinder, a pressing plate assembly arranged on the cylinder output shaft, and a push rod and a first blocking rod arranged on the lower bottom surface of the pressing plate assembly, wherein the pressing plate assembly and the bottom plate enclose a housing chamber for housing the engine;

[0053] A blocking mechanism, comprising a blocking member and a sliding assembly, wherein the blocking member blocks one end of the first through hole, and the sliding assembly comprises a pushing portion, a sliding portion and a blocking portion which are arranged in sequence, wherein the pushing portion is arranged opposite to the blocking member, the sliding member is arranged through the engine, and the blocking portion is arranged opposite to the other end of the first through hole;

[0054] A locking mechanism is fixed on the bottom plate, and the locking mechanism has a supporting groove for supporting the lower pressure plate assembly;

[0055] When the cylinder drives the lower pressure plate assembly to abut against the abutting groove, the first blocking rod blocks the second through hole, and the pushing rod pushes the pushing part to drive the sliding part and the blocking part to move to block the first through hole.

[0056] The present application replaces the hydraulic cylinder in the prior art by combining the cylinder and the locking mechanism, thereby avoiding the problem of the existing hydraulic cylinder being large in size and heavy in weight, and ensuring the stroke and precision of the pressing mechanism. In addition, by setting a push rod and a sliding assembly, the cylinder moves in the vertical direction to drive the first blocking rod to fill the vertical hole of the engine, while the push rod pushes the sliding assembly to synchronously block the hole on the side of the engine, thereby avoiding the tedious operation of manually blocking the holes on the engine one by one during the air tightness test of the specific engine.

[0057] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] See also Figure 1-Figure 14 The present application provides an air tightness detection device 100 using a cylinder 21, which is used to detect the air tightness of an engine 200. The engine 200 includes a main body 210 and a barrel 220 arranged horizontally on the main body 210. The barrel 220 has a first through hole 2201 passing through it. The main body 210 has a second through hole 211 connected to the inner cavity of the engine 200 in the vertical direction. It should be noted that please refer to Figure 3 and Figure 4, the above-mentioned engine 200 is a specific engine 200, that is, a non-standard part. In the process of air tightness detection of the engine 200, the air tightness detection equipment of the standard engine 200 is often unable to detect the non-standard engine 200. The non-standard engine 200 targeted by the present application is an engine 200 having a first through hole 2201 penetrating in the horizontal direction, and a second through hole 211 connected to the inner cavity of the engine 200 is also provided in the vertical direction. When the air tightness detection equipment of the engine 200 involved in the patent application documents CN214748656U or CN109357821 B is used to detect the air tightness, it is often necessary to use a lot of lateral clamping devices to clamp the holes on the sides and the holes on the top of the engine 200 of the present application, resulting in a large waste of manpower and material resources. And in the prior art, in the air tightness detection equipment of the engine 200, generally the engine 200 is first fixed on the frame by a clamp, and after all the holes on the engine 200 are blocked by some clamping mechanisms, high-pressure gas is input into one hole of the engine 200, and the air pressure or gas volume in other holes or the detection clamp is used to detect whether the engine 200 to be detected has an air tightness problem. However, due to its weight and stroke problems, it is often difficult to make its stroke very large for a normal hydraulic cylinder. In order to use the hydraulic cylinder and meet the large stroke, the volume of the hydraulic cylinder is often increased to meet the demand. When the volume of the hydraulic cylinder is increased, the weight and cost of the equipment are undoubtedly greatly increased. For this reason, the present application proposes an air tightness detection equipment for the above-mentioned specific engine 200, which is intended to replace the traditional hydraulic cylinder and can solve the advantages of the hydraulic cylinder in being able to resist the high-pressure gas in the engine 200 and ensure its measurement accuracy, as follows:

[0059] The present application proposes an air tightness detection device 100 using a cylinder 21, which includes a base plate 10, a pressing mechanism 20 and a blocking mechanism 30. Specifically, the pressing mechanism 20 includes a cylinder 21, a pressing plate assembly 22 arranged on the output shaft of the cylinder 21, and a pushing rod 23 and a first blocking rod 24 arranged on the lower bottom surface of the pressing plate assembly 22. The pressing plate assembly 22 and the base plate 10 enclose a housing chamber 22a for accommodating the engine 200; the blocking mechanism 30 includes a blocking member 31 and a sliding assembly 32. The blocking member 31 blocks one end of the first through hole 2201. The sliding assembly 32 includes a pushing portion 321, a sliding portion 322 and a blocking portion 323 arranged in sequence. The pushing portion 321 is arranged opposite to the blocking member 31. The sliding member is arranged through the engine 200, and the blocking portion 323 is arranged opposite to the other end of the first through hole 2201; the locking mechanism 40 is fixed on the base plate 10, and the locking mechanism 40 has a supporting groove 40a for supporting the lower pressure plate assembly 22; wherein, when the cylinder 21 drives the lower pressure plate assembly 22 to be supported in the supporting groove 40a, the first blocking rod 24 is blocked in the second through hole 211, and the pushing rod 23 pushes the pushing portion 321 to drive the sliding portion 322 and the blocking portion 323 to move to block the first through hole 2201.

[0060] Please note that Figure 3-Figure 5 Since the specific engine 200 involved in the present application has a first through hole 2201 penetrating in the horizontal direction, that is, both ends of the first through hole 2201 penetrate the engine 200 respectively, and after the engine 200 is supported and fixed in the accommodating chamber 22a, in order to improve the convenience of clamping the engine 200 to simultaneously block the holes in the vertical and horizontal directions, the present application uses a combination of a cylinder 21 and a pressing mechanism 20, so that the driving force generated by the cylinder 21 drives the pressing mechanism 20 to move downward to drive the first blocking rod 24 to block the holes in the vertical direction of the engine 200. Preferably, the first blocking rod 24 is set for the holes in the vertical direction of the engine 200. By setting a blocking mechanism 30 and a push rod 23, the driving force of the cylinder 21 in the vertical direction is transmitted to the horizontal direction through the push rod 23 and the blocking mechanism 30, thereby driving the sliding assembly 32 to move to block the holes in the horizontal direction of the engine 200.

[0061] In a specific embodiment, the sealing member 31 includes but is not limited to a sealing plug structure with a sealing strip.

[0062] In one specific embodiment, see Figure 6-Figure 7, the pushing portion 321, the sliding portion 322 and the blocking portion 323 are integrally formed, and a pushing space is formed between the pushing portion 321 and the blocking portion 323, so that the pushing member can extend into and push the pushing portion 321 to move. Preferably, the width of the pushing member is greater than the distance from the blocking portion 323 to the first through hole 2201, so that when the pushing member extends into the pushing space in the vertical direction and pushes the pushing portion 321, the pushing portion 321 drives the blocking portion 323 to move toward the first through hole 2201 through the sliding portion 322, and the moving distance is the displacement of the width of the pushing member. Specifically, a flexible sealing plug structure is provided on the blocking portion 323, so that when the displacement distance is greater than the distance between it and the first through hole 2201, the flexible sealing plug is squeezed into the first through hole 2201 to form a seal.

[0063] Furthermore, in order to ensure the accuracy of sealing the vertical hole of the engine 200, when the cylinder 21 drives the pressing mechanism 20 to get stuck in the locking mechanism 40, the distance traveled by the first blocking rod 24 is greater than the distance from the original position of the first blocking rod 24 to the upper hole of the engine 200, so that after the cylinder 21 drives the pressing mechanism 20 to run a certain displacement, the first blocking rod 24 can be blocked into the upper hole of the engine 200 to achieve sealing.

[0064] In a specific embodiment, the sliding portion 322 is disposed in a slide rail of the base plate 10 and moves in the slide rail.

[0065] Please continue reading Figure 6-Figure 7 The lower pressing plate assembly 22 includes a lower pressing plate 221 and a connecting assembly 222 disposed on the lower pressing plate 221. The connecting assembly 222 includes a first plate 2221, a second plate 2222 and a connecting shaft 2223 disposed on the lower pressing plate 221. The first plate 2221 and the second plate 2222 are arranged in parallel, and the two ends of the connecting shaft 2223 are respectively fixed on the first plate 2221 and the second plate 2222. The lower pressing plate 221 is provided with a receiving port 221a. The locking mechanism 40 includes a height adjusting member 41 and a locking assembly 42 disposed on the height adjusting member 41. The abutting groove 40a is disposed on the locking assembly 42, and the locking assembly 42 extends into the receiving port 221a, so as to drive the connecting shaft 2223 to be clamped in the locking member when the cylinder 21 drives the lower pressing plate assembly 22 to be pressed downward.

[0066] It should be noted that, by setting the receiving port 221a, and the locking mechanism 40 is composed of the height adjustment member 41 and the locking assembly 42, the height adjustment member 41 is set on the bottom plate 10, and the locking assembly 42 is extended into the receiving port 221a and is set through the lower pressure plate 221, so that the locking assembly 42 can be adjusted to a suitable position through the height adjustment member 41. Specifically, the distance between the connecting shaft 2223 and the locking assembly 42 is equal to the distance between the first blocking rod 24 and the upper opening of the engine 200. Preferably, the height adjustment assembly is a ball screw, so that when the cylinder 21 drives the lower pressure plate 221 to press down, the lower pressure plate 221 transmits pressure to the connecting shaft 2223, and the connecting shaft 2223 transmits pressure to the locking assembly 42 and the height adjustment member 41, the height adjustment member 41 can withstand the pressure from the cylinder 21.

[0067] See also Figure 8-Figure 10 In a specific embodiment, the locking assembly 42 includes a housing 421 and a first locking member 422 and a second locking member 423 disposed in the housing 421. The housing 421 includes a connecting portion 4211 and a locking portion 4212 disposed on the connecting portion 4211, the abutting groove 40a is provided on the locking portion 4212, and the locking portion 4212 is provided with a first locking groove 4212a and a second locking groove 4212b along its width direction, the first locking member 422 is rotatably disposed in the first locking groove 4212a, and the second locking member 423 is rotatably disposed in the second locking groove 4212b.

[0068] In a specific embodiment, the connecting portion 4211 and the locking portion 4212 are integrally formed.

[0069] The above scheme realizes the arrangement of the first locking member 422 and the second locking member 423 by providing the first locking groove 4212a and the second locking groove 4212b on the locking portion 4212, and rotatably arranging the first locking member 422 in the first locking groove 4212a, and rotatably arranging the second locking member 423 in the second locking groove 4212b. Specifically, the first locking member 422 and the second locking member 423 are roller structures, which are passed through the central axis by a shaft, and the two ends of the shaft are respectively fixed to the locking portion 4212. Preferably, the abutting groove 40a is a groove opened on the side of the locking portion 4212, so as to withstand the pressure brought by the drive of the cylinder 21.

[0070] Specifically, a first self-rotating hole 422c is provided inside the first locking member 422, a second self-rotating hole 423c is provided inside the second locking member 423, and third springs 44 are provided inside the first self-rotating hole 422c and the second self-rotating hole 423c. Specifically, one end of the two third springs 44 is respectively fixed in the first self-rotating hole 422c and the second self-rotating hole 423c, and the other end extends out of the first locking member 422 and the second locking member 423 and is fixed on the locking portion 4212. Due to the elasticity of the third springs 44, the third springs 44 will push the first locking member 422 and the second locking member 423 to rotate to the position as shown in the figure. Fig. 9 Status shown.

[0071] See also Figure 8-Figure 10 In order to ensure the tightness of the locking of the pressing mechanism 20 and the accuracy of the pressing when the connecting shaft 2223 is fixed between the first locking piece 422 and the second locking piece 423, and to prevent the connecting shaft 2223 from upwardly detaching from the first locking piece 422 and the second locking piece 423 due to the impact of the high-pressure gas inside the engine 200, thereby causing an airtightness detection error, a first semicircular groove 422a is provided on the first locking piece 422, and a second semicircular groove 423a is provided on the second locking piece 423. The first semicircular groove 422a and the second semicircular groove 423a are used to enclose each other to lock the connecting shaft 2223. Among them, the first locking piece 422 has a first inclined surface 422b connected to the first semicircular groove 422a, and the second locking piece 423 has a second inclined surface 423b connected to the second semicircular groove 423a. The airtightness detection equipment also includes a clamping piece 50, which can extend into and abut against the first inclined surface 422b and the second inclined surface 423b to clamp the first locking piece 422 and the second locking piece 423.

[0072] In a specific embodiment, the pressing plate 221 is a plate-shaped structure.

[0073] Please refer to Figure 9-10 , Figure 9-10 2 is a cross-sectional view of the connecting shaft 2223 from an unlocked state to a locked state. When the cylinder 21 drives the upper pressing plate to move downward, at this time, the openings of the first semicircular groove 422a on the first locking member 422 and the second semicircular groove 423a on the second locking member 423 are both set toward the connecting shaft 2223. When the lower pressing plate 221 moves downward and contacts the first semicircular groove 422a and the second semicircular groove 423a, the connecting shaft 2223 drives the first semicircular groove 422a and the second semicircular groove 423a to rotate along the axis of their corresponding locking members until the connecting shaft 2223 abuts against the abutting groove 40a. The state of the connecting shaft 2223 and the first locking member 422 and the second locking member 423 is as shown in FIG. Fig.10As shown, at this time, the first blocking rod 24 has been blocked into the upper hole of the engine 200, and the push rod 23 has pushed the push part 321 to drive the sliding part 322 to move, thereby driving the blocking part 323 to block the first through hole 2201. At this time, by extending the clamping member 50 into and abutting against the first inclined surface 422b on the first locking member 422 and the second inclined surface 423b on the second locking member 423, the connecting shaft 2223 can be locked to prevent the connecting shaft 2223 from moving upward due to the impact of the high-pressure gas in the cylinder 21, resulting in the clamp not clamping the engine 200 tightly and causing detection errors. The specific principle of preventing the connecting shaft 2223 from moving upward is as follows:

[0074] In a semicircular groove, the butt angle is the angle between the two semicircular grooves, that is, the angle between the planes where the other ends of the two semicircular grooves are located when the opposite ends of the two semicircular grooves are arranged flush. In the present application, when the clamping member 50 is supported against the opposite ends of the first semicircular groove 422a and the second semicircular groove 423a, when the connecting shaft 2223 is impacted by the high-pressure gas in the engine 200, the clamping member 50 will generate friction at the first inclined surface 422b and the second inclined surface 423b to resist the movement of the connecting shaft 2223, thereby clamping the connecting shaft 2223 in the first semicircular groove 422a and the second semicircular groove 423a. The specific method for calculating the external impact that can be resisted is as follows:

[0075] First, the friction force at the first inclined surface 422b and the second inclined surface 423b is ; where is the friction force of the clamping member 50 at the first inclined surface 422b and the second inclined surface 423b, is the friction coefficient, and is the positive pressure. Due to the docking angle, the first semicircular groove 422a and the second semicircular groove 423a generate a radial positive pressure on the connecting shaft 2223, and the pressure is proportional to the cosine value of the docking angle, that is, where is the preload force caused by the clamping member 50, and the maximum force that the connecting shaft 2223 can resist the high-pressure gas in the engine 200 is . In order to keep the connecting shaft 2223 from being affected by the impact of the high-pressure gas in the engine 200, the condition must be met: Since the expression of can be substituted into the formula, it can be obtained: The above docking angle can be calculated.

[0076] In a specific embodiment, the pressure of the high-pressure gas introduced into the engine 200 of the present application is 16.68bar-18.81bar. It should be noted that 1bar=100000Pa, and the contact area between the connecting shaft 2223 and the first inclined surface 422b and the second inclined surface 423b is 10 square centimeters. The material of the connecting shaft 2223 is iron, and its friction coefficient is 0.3. It can be seen from the above formula and data that when the docking angle θ between the first inclined surface 422b and the second inclined surface 423b is 5°≤θ≤15°, the friction force generated between the first inclined surface 422b, the second inclined surface 423b and the clamping member 50 is greater than the force generated by the high-pressure gas of the above gas pressure on the connecting shaft 2223. Therefore, when the docking angle between the first inclined surface 422b and the second inclined surface 423b of the above scheme is 5°≤θ≤15°, it can prevent the upper pressure plate from being pushed open by the high-pressure gas in the engine 200 and causing the problem of airtightness detection error. Preferably, the butt angle θ between the first inclined surface 422b and the second inclined surface 423b is 10°.

[0077] In one specific embodiment, the clamping member 50 is a columnar structure.

[0078] See also Figure 11-Figure 14 Since there is an inclined column 230 in the hole position of the engine 200 along the vertical direction, the first blocking rod 24 is prone to misalignment with the third through hole 231 of the inclined column 230 during the downward pressing process, resulting in sealing problems, which affects the accuracy of the detection and produces errors.

[0079] In a specific embodiment, along the vertical direction, an inclined column 230 is further provided on the surface of the engine 200, and a third through hole 231 communicating with the inner cavity is provided on the inclined column 230. The airtightness detection device further includes a second blocking rod 60, and the second blocking rod 60 further includes a fixed rod 61 and a blocking block 62, wherein the fixed rod 61 is fixed to the lower bottom surface of the lower pressure plate assembly 22, and the blocking portion 323 is movably provided on the fixed rod 61, and is used for the blocking block 62 to move on the fixed rod 61 to block the third through hole 231 on the inclined column 230 when the cylinder 21 drives the lower pressure plate assembly 22 to drive the second blocking rod 60 to press down.

[0080] It should be noted that there is a wall thickness at the inclined column 230 of the engine 200. When the fixing rod 61 moves downward with the cylinder 21 and the lower pressure plate 221, the blocking block 62 first contacts the inclined column 230. If the blocking block 62 is not aligned with the third through hole 231 on the inclined column 230 at this time, as the fixing rod 61 is further pressed downward, the blocking block 62 will move on the fixing rod 61 until the blocking block 62 is moved into the third through hole 231.

[0081] Specifically, a sliding groove 611 is provided on a side of the fixing rod 61 facing the blocking block 62, and a sliding block 621 is provided on a side of the blocking block 62 facing the fixing rod 61. The sliding block 621 is arranged in the sliding groove 611, and is used for enabling the blocking block 62 to move on the sliding groove 611 to adjust the angle of the blocking block 62 to fill the third through hole 231 when the blocking block 62 contacts the inclined column 230.

[0082] In order to further ensure the sealing of the inclined column 230, the fixed rod 61 also includes a stopper plate 612, the stopper plate 612 blocks the slide slot 611, and a push hole 612a is provided on the stopper plate 612. The second blocking rod 60 also includes a pushing assembly 63, the pushing assembly 63 includes a pushing block 631 and a first spring 632, the pushing block 631 is arranged in the slide slot 611 and on the slider 621, the first spring 632 is arranged in a direction perpendicular to the fixed rod 61 facing the surface where the blocking block 62 is located, and the two ends are respectively arranged on the fixed rod 61 and the pushing block 631, so that when the pushing block 631 moves to face the pushing hole 612a, the first spring 632 pushes the pushing block 631 to squeeze the blocking block 62 into the third through hole 231 of the inclined column 230.

[0083] It should be noted that when the cylinder 21 drives the lower pressure plate downward to drive the second blocking rod 60 to move and the second blocking rod 60 is not aligned with the third through hole 231 when contacting the inclined column 230, at this time, the slider 621 on the blocking block 62 moves in the slide groove 611 on the fixed rod 61, and the slider 621 drives the push block 631 to move until the push block 631 moves to the push hole 612a. At this time, under the elastic force of the first spring 632, the first spring 632 pushes the push block 631 to squeeze the blocking block 62 to squeeze the blocking block 62 into the third through hole 231. After the air tightness test is completed, the cylinder 21 drives the second blocking rod 60 to leave the inclined column 230. At this time, the push block 631 is manually adjusted to enter the push hole 612a for reuse.

[0084] In order to facilitate the reset of the push block 631 after the air tightness test is completed, in a specific embodiment, the second blocking rod 60 also includes a second spring 64, the second spring 64 is arranged in the slide groove 611, and the two ends of the second spring 64 are respectively fixed on the slider 621 and the push block 631, and is used to drive the push block 631 to reset when the cylinder 21 drives the upper pressure plate assembly and drives the blocking block 62 away from the third through hole 231.

[0085] It should be noted that after the air tightness test is completed, the push block 631 is reset under the action of the second spring 64, thereby avoiding the cumbersome operation caused by manual reset.

[0086] The present application sets a second blocking rod 60, and divides the second blocking rod 60 into a fixed rod 61 and a blocking block 62, and sets a first spring 632 and a pushing block 631, so that when the cylinder 21 drives the pressing plate 221 to press down so that the second blocking rod 60 blocks the third through hole 231, the blocking block 62 can move on the fixed rod 61 to slide to the correct blocking position, and block the inclined column 230 under the thrust of the first spring 632 and the pushing block 631, thereby preventing the problem of low detection accuracy caused by poor sealing due to the difficulty in aligning the hole position of the inclined column 230 on the engine 200.

[0087] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. An air tightness detection device using a cylinder, used to detect the air tightness of an engine, characterized in that: The engine includes a main body and a barrel portion arranged in a horizontal direction on the main body, the barrel portion penetrates a first through hole, and the main body is provided with a second through hole connected to the engine inner cavity in a vertical direction, and the airtightness detection device also includes: Base plate; The pressing mechanism comprises a cylinder, a pressing plate assembly arranged on the cylinder output shaft, and a push rod and a first blocking rod arranged on the lower bottom surface of the pressing plate assembly, wherein the pressing plate assembly and the bottom plate enclose a housing chamber for housing the engine; A blocking mechanism, comprising a blocking member and a sliding assembly, wherein the blocking member blocks one end of the first through hole, and the sliding assembly comprises a pushing portion, a sliding portion and a blocking portion which are arranged in sequence, wherein the pushing portion is arranged opposite to the blocking member, the sliding member is arranged through the engine, and the blocking portion is arranged opposite to the other end of the first through hole; A locking mechanism is fixed on the bottom plate, and the locking mechanism has a supporting groove for supporting the lower pressure plate assembly; When the cylinder drives the lower pressure plate assembly to abut against the abutting groove, the first blocking rod blocks the second through hole, and the pushing rod pushes the pushing portion to drive the sliding portion and the blocking portion to move to block the first through hole, so as to transmit the driving force of the cylinder in the vertical direction to the horizontal direction through the pushing rod and the blocking mechanism; In the vertical direction, an inclined column is also provided on the surface of the engine, and a third through hole communicating with the inner cavity is provided on the inclined column; The air tightness detection device further includes a second blocking rod, which further includes a fixed rod and a blocking block, wherein the fixed rod is fixed to the lower bottom surface of the lower pressure plate assembly, and the blocking portion is movably arranged on the fixed rod, and is used for the blocking block to move on the fixed rod to block the third through hole on the inclined column when the cylinder drives the lower pressure plate assembly to drive the second blocking rod to be pressed down; A slide groove is provided on one side of the fixing rod facing the blocking block, and a slider is provided on one side of the blocking block facing the fixing rod. The slider is arranged in the slide groove, and is used for enabling the blocking block to move on the slide groove to adjust the angle of the blocking block to fill the third through hole when the blocking block contacts the inclined column; The fixing rod further comprises a stop plate, the stop plate blocks the slide slot, and a push hole is formed on the stop plate; The second blocking rod further includes a pushing assembly, which includes a pushing block and a first spring, wherein the pushing block is arranged in the slide groove and on the slider, and the first spring is arranged in a direction perpendicular to the fixed rod facing the surface where the blocking block is located, and the two ends of the first spring are respectively arranged on the fixed rod and the pushing block, and when the pushing block moves to face the pushing hole, the first spring pushes the pushing block to squeeze the blocking block into the third through hole of the inclined column; The second blocking rod also includes a second spring, which is arranged in the slide groove, and the two ends of the second spring are respectively fixed on the slider and the push block, and is used to drive the push block to reset when the cylinder drives the upper pressure plate assembly and drives the blocking block away from the third through hole.

2. The air tightness detection device using a cylinder according to claim 1, characterized in that: The lower pressing plate assembly comprises a lower pressing plate member and a connecting assembly arranged on the lower pressing plate member; The connecting assembly comprises a first plate, a second plate and a connecting shaft arranged on the lower pressing plate, the first plate and the second plate are arranged in parallel, two ends of the connecting shaft are respectively fixed to the first plate and the second plate, and the lower pressing plate is provided with a receiving opening; The locking mechanism includes a height adjusting member and a locking assembly arranged on the height adjusting member, the retaining groove is arranged on the locking assembly, and the locking assembly extends into the accommodating port, and is used to drive the connecting shaft to be clamped in the retaining groove when the cylinder drives the lower pressure plate assembly to be pressed downward.

3. The air tightness detection device using a gas cylinder according to claim 2, characterized in that: The locking assembly comprises a housing and a first locking member and a second locking member disposed in the housing; The shell includes a connecting portion and a locking portion arranged on the connecting portion, the supporting groove is opened on the locking portion, and the locking portion is provided with a first locking groove and a second locking groove along its width direction, the first locking member can be rotatably arranged in the first locking groove, and the second locking member can be rotatably arranged in the second locking groove.

4. The air tightness detection device using a gas cylinder according to claim 3, characterized in that: The first locking member is provided with a first semicircular groove, and the second locking member is provided with a second semicircular groove, wherein the first semicircular groove and the second semicircular groove are used to surround each other to lock the connecting shaft; Among them, the first locking piece has a first inclined surface connected to the first semicircular groove, the second locking piece has a second inclined surface connected to the second semicircular groove, and the airtightness detection equipment also includes a clamping piece, which can extend into and abut against the first inclined surface and the second inclined surface to clamp the first locking piece and the second locking piece.

5. The air tightness detection device using a gas cylinder according to claim 4, characterized in that: The contact area between the first inclined surface, the second inclined surface and the clamping member is 10 square centimeters, and the butt angle between the first inclined surface and the second inclined surface is θ, wherein 5°≤θ≤15°.

6. The airtightness detection device using a gas cylinder according to claim 5, characterized in that: The butt angle θ between the first inclined surface and the second inclined surface is 10°.

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