Detection device for oil nozzle assembly

Abstract

The invention relates to the technical field of oil nozzle detection, in particular to an oil nozzle assembly detection device which comprises a supporting frame, a top gas transmission mechanism is arranged at the top end of the supporting frame, and a left clamping mechanism and a right clamping mechanism which are used for clamping an oil nozzle are arranged at the left end and the right end of the inner side of the supporting frame respectively. The left clamping mechanism and the right clamping mechanism are jointly provided with a lateral gas conveying mechanism, and the supporting frame is provided with a synchronous transmission mechanism used for driving the left clamping mechanism and the right clamping mechanism to move synchronously. The lateral gas transmission mechanism and the top gas transmission mechanism are matched with the bottom sealing mechanism, so that different positions of the oil nozzle can be detected one by one by performing ventilation detection and sealing on the different positions of the oil nozzle in the sealing performance detection process of the oil nozzle; and the position of insufficient sealing performance of the oil nozzle can be reflected more intuitively, so that a worker can formulate a corresponding solution conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel injector detection, and particularly to a fuel injector assembly detection device. Background Art

[0002] Fuel injectors are mainly applied to various engine systems powered by fuel. The fuel injector itself is a normally closed valve, and a valve needle moves up and down to control the opening and closing of the valve. There are various control types for fuel injectors. Among them, mechanical fuel injectors rely on mechanical pressure and the movement of mechanical components to control fuel injection. The fuel injection pump pressurizes the fuel and sends it to the fuel injector. When the fuel pressure reaches a certain value, it overcomes the spring pressure and pushes the needle valve upward, and the fuel is sprayed out at high speed from the spray hole. When the pressure drops, the spring force makes the needle valve return to its position to close the spray hole.

[0003] When manufacturing mechanical fuel injectors, leak tightness detection is a very important step to ensure that the fuel injectors meet the design standards and improve the consistency of fuel injector products. When performing leak tightness detection on fuel injectors through a leak tightness detection device, pressurized gas is introduced into the fuel injector, and then the device reads the data to detect whether there is a problem of insufficient leak tightness in the fuel injector.

[0004] Detecting the leak tightness of fuel injectors in this way can only determine whether there is a problem of insufficient leak tightness in the fuel injector, but cannot determine the position where the fuel injector has insufficient leak tightness, which affects the judgment of the leak tightness performance of the fuel injector by the staff; the return oil port of the fuel injector is located on the side of the fuel injector. When clamping the fuel injector, it is necessary to align the position of the return oil port with the inflation test position to facilitate the leak tightness detection of the return oil port position. As a result, when placing the fuel injector, it is also necessary to perform alignment at a specified position, which affects the detection efficiency of the fuel injector. Summary of the Invention

[0005] Therefore, the present invention provides a fuel injector assembly detection device to solve the above technical problems.

[0006] A fuel injector assembly detection device provided by the present invention includes a support frame. A top air supply mechanism is arranged at the top of the support frame. Left and right clamping mechanisms for clamping the fuel injector are respectively arranged at the left and right ends inside the support frame. A lateral air supply mechanism is jointly arranged on the left and right clamping mechanisms. A synchronous transmission mechanism for driving the left and right clamping mechanisms to move synchronously is arranged on the support frame. A bottom sealing mechanism is arranged at the bottom end inside the support frame.

[0007] The right clamping mechanism includes a connecting member arranged on the support frame. Two upper and lower distributed right arc-shaped clamping members are fixedly connected to the left side of the connecting member. A plurality of sickle-shaped pins are evenly distributed on the left side surface of the right arc-shaped clamping member.

[0008] The connecting piece includes a plurality of telescopic guide rods II fixedly connected to the support frame. The left ends of the plurality of telescopic guide rods II are fixedly connected together with a mounting sleeve plate. A right mounting back plate is slidably connected up and down inside the mounting sleeve plate. A power cylinder is fixedly connected to the right side surface of the mounting sleeve plate. The telescopic end of the power cylinder is fixedly connected to the lower surface of the right mounting back plate through a connecting bar.

[0009] According to an embodiment of the present invention, the bottom sealing mechanism includes a first hydraulic cylinder fixedly connected to the upper surface of the bottom end of the support frame. The top end of the first hydraulic cylinder is fixedly connected with a connecting plate. A rubber sealing pad is fixedly connected to the upper surface of the connecting plate. A plurality of limiting telescopic rods are fixedly connected to the lower surface of the connecting plate in a circumferential array. The bottom ends of the limiting telescopic rods are fixedly connected to the support frame.

[0010] According to an embodiment of the present invention, the synchronous transmission mechanism includes two symmetrically arranged support columns fixedly connected to the bottom end of the support frame. Two bidirectional threaded rods are rotatably connected to the support columns and are distributed up and down. A transmission belt pulley is fixedly connected to the left end of the bidirectional threaded rod. The left side surface of the transmission belt pulley is rotatably connected to the support frame through a connecting shaft. The right end of the bidirectional threaded rod is rotatably connected to the support frame.

[0011] According to an embodiment of the present invention, the left clamping mechanism includes a plurality of uniformly distributed telescopic guide rods I fixedly connected to the left end inside the support frame. The right ends of the plurality of telescopic guide rods I are fixedly connected together with a left mounting back plate. Two left arc-shaped clamping members are fixedly connected to the right side surface of the left mounting back plate and are distributed up and down. A plurality of uniformly distributed clamping grooves are formed on the right side surface of the left arc-shaped clamping member. The positions of the plurality of clamping grooves correspond to the positions of the plurality of sickle-shaped pins one by one and are in clamping fit.

[0012] According to an embodiment of the present invention, the lateral gas transmission mechanism includes two symmetrically arranged sealing sleeves disposed between the opposite surfaces of the left clamping mechanism and the right clamping mechanism. A plurality of telescopic connecting rods are fixedly connected to the opposite side surfaces of the two sealing sleeves. The right ends of the plurality of telescopic connecting rods on the right side are fixedly connected together with a sliding plate. A plurality of limiting connecting rods are uniformly distributed in the front-rear direction and are elastically slidably connected through the upper surface of the sliding plate. The limiting connecting rods are fixedly connected to the right clamping mechanism.

[0013] According to an embodiment of the present invention, the top gas transmission mechanism includes a connection frame clamped to the top end of the support frame. Two symmetric second hydraulic cylinders are fixedly connected to the upper surface of the connection frame. The top ends of the two second hydraulic cylinders are jointly fixedly connected to a linkage plate. Two limit slide rods distributed front and back are fixedly connected to the lower surface of the linkage plate. The bottom ends of the limit slide rods penetrate through the lower surface of the connection frame. The bottom ends of the two limit slide rods are jointly fixedly connected to a sealing cover.

[0014] According to an embodiment of the present invention, a sealing ring is arranged on the lower surface of the sealing cover, and an air inlet pipe penetrates through the upper surface of the sealing cover.

[0015] According to an embodiment of the present invention, an arc-shaped protrusion is arranged on the vertical section of the sickle-shaped pin, and the shape of the clamping groove is adapted to the shape of the sickle-shaped pin.

[0016] According to an embodiment of the present invention, the left side surface of the left sealing sleeve is fixedly and penetratingly connected with a gas transmission connection pipe. A through hole with a diameter larger than that of the gas transmission connection pipe is opened at the position corresponding to the gas transmission connection pipe on the left mounting back plate. The left end of the gas transmission connection pipe penetrates through the through hole on the left mounting back plate.

[0017] According to an embodiment of the present invention, a driving motor is installed on the upper surface of the bottom end of the support frame through a motor seat. A pulley is fixedly connected to the output shaft of the driving motor. The pulley is in transmission connection with a plurality of transmission pulleys through a belt.

[0018] Applying the technical solution of the present invention: 1. Through the cooperation of the lateral gas transmission mechanism and the top gas transmission mechanism with the bottom sealing mechanism, during the sealing detection of the fuel injector, by respectively ventilating and sealing different positions of the fuel injector, different positions of the fuel injector can be detected one by one, which can more intuitively reflect the position where the fuel injector has insufficient sealing performance, so as to facilitate the staff to formulate corresponding solutions.

[0019] 2. Through the setting of the lateral gas transmission mechanism, during the detection of the fuel injector, it is not necessary to specify the position of the oil return port for alignment. No matter what orientation the fuel injector is in, it can be wrapped and sealed or gas can be transmitted by the lateral gas transmission mechanism. When placing the fuel injector, it can be more convenient and fast, improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0021] Figure 1 It is a schematic perspective view of the fuel injector assembly detection device provided by the present invention.

[0022] Figure 2 It is a schematic perspective view of the support frame provided by the present invention.

[0023] Figure 3 It is a schematic perspective view of the top gas transmission mechanism provided by the present invention.

[0024] Figure 4 It is a schematic perspective view of the synchronous transmission mechanism provided by the present invention.

[0025] Figure 5 It is a schematic perspective view of the right clamping mechanism provided by the present invention.

[0026] Figure 6 It is a schematic perspective view of the lateral gas transmission mechanism provided by the present invention.

[0027] Figure 7 It is a schematic perspective view of the connecting piece provided by the present invention.

[0028] Figure 8 It is a partial sectional view of the clamping groove provided by the present invention.

[0029] Figure 9 It is a schematic perspective view of the bottom sealing mechanism provided by the present invention.

[0030] Reference numerals: 1, support frame; 2, bottom sealing mechanism; 3, synchronous transmission mechanism; 4, left clamping mechanism; 5, lateral gas transmission mechanism; 6, right clamping mechanism; 7, top gas transmission mechanism; 21, rubber sealing pad; 22, connecting plate; 23, limit telescopic rod; 24, first hydraulic cylinder; 31, support column; 32, bidirectional threaded rod; 33, belt pulley; 34, connecting shaft; 41, left arc-shaped clamping piece; 43, telescopic guide rod 1; 44, left mounting back plate; 45, clamping groove; 51, sliding plate; 52, telescopic connecting rod; 53, sealing sleeve; 54, limit connecting rod; 61, sickle-shaped pin; 62, right arc-shaped clamping piece; 64, connecting piece; 71, connecting frame; 72, second hydraulic cylinder; 73, limit sliding rod; 74, sealing cover; 75, linkage plate; 641, mounting sleeve plate; 642, right mounting back plate; 643, electric push rod; 644, telescopic guide rod 2. Detailed implementation manners

[0031] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] As Figure 1 and Figure 2 shown, an injector assembly detection device includes a support frame 1. A top air supply mechanism 7 is provided at the top of the support frame 1. Left and right clamping mechanisms 4 and 6 for clamping the injector are respectively provided at the left and right ends inside the support frame 1. A lateral air supply mechanism 5 is jointly provided on the left and right clamping mechanisms 4 and 6. A synchronous transmission mechanism 3 for driving the left and right clamping mechanisms 4 and 6 to move synchronously is provided on the support frame 1. A bottom sealing mechanism 2 is provided at the bottom inside the support frame 1.

[0033] As Figure 1 and Figure 3 shown, the top air supply mechanism 7 includes a connection frame 71 clamped at the top of the support frame 1. Two second hydraulic cylinders 72 symmetrically arranged front and back are fixedly connected to the upper surface of the connection frame 71. A linkage plate 75 is jointly fixedly connected to the tops of the two second hydraulic cylinders 72. Two limit slide rods 73 distributed front and back are fixedly connected to the lower surface of the linkage plate 75. The bottom ends of the limit slide rods 73 penetrate through the lower surface of the connection frame 71. The bottom ends of the two limit slide rods 73 are jointly fixedly connected to a sealing cover 74. A sealing ring is provided on the lower surface of the sealing cover 74. An air inlet pipe penetrates through the upper surface of the sealing cover 74.

[0034] As Figure 1 and Figure 4 shown, the synchronous transmission mechanism 3 includes two support columns 31 symmetrically arranged front and back fixedly connected to the bottom end of the support frame 1. Two bidirectional threaded rods 32 distributed up and down are rotatably connected to the support columns 31. A transmission belt wheel 33 is fixedly connected to the left end of the bidirectional threaded rod 32. The left side surface of the transmission belt wheel 33 is rotatably connected to the support frame 1 through a connecting shaft 34. The right end of the bidirectional threaded rod 32 is rotatably connected to the support frame 1. A driving motor is installed on the upper surface of the bottom end of the support frame 1 through a motor base. A belt wheel is fixedly connected to the output shaft of the driving motor. The belt wheel is in transmission connection with a plurality of transmission belt wheels 33 through a belt.

[0035] During specific use, first remove the connecting frame 71 from the top of the support frame 1, then place the fuel injector between the left clamping mechanism 4 and the right clamping mechanism 6, and then re-connect the connecting frame 71 to the top of the support frame 1. At this time, the driving motor drives the bidirectional threaded rod 32 to rotate on the support column 31 through the transmission pulley 33, driving the left clamping mechanism 4 and the right clamping mechanism 6 to clamp the fuel injector between them.

[0036] As Figure 1 and Figure 5 shown, the right clamping mechanism 6 includes a connecting member 64 provided on the support frame 1. Two vertically distributed right arc-shaped clamping members 62 are fixedly connected to the left side of the connecting member 64. In order to adapt to the clamping of the fuel injector at the upper and lower sides of the oil return port, the lengths of the two vertically distributed right arc-shaped clamping members 62 are different. A plurality of sickle-shaped pins 61 are evenly distributed on the left side surface of the right arc-shaped clamping member 62.

[0037] As Figure 1 , Figure 4 and Figure 8 shown, the left clamping mechanism 4 includes a plurality of uniformly distributed first telescopic guide rods 43 fixedly connected to the left end inside the support frame 1. The right ends of the plurality of first telescopic guide rods 43 are commonly fixedly connected to a left mounting back plate 44. Two vertically distributed left arc-shaped clamping members 41 are fixedly connected to the right side surface of the left mounting back plate 44. In order to adapt to the clamping of the fuel injector at the upper and lower sides of the oil return port, the lengths of the two vertically distributed left arc-shaped clamping members 41 are different. A plurality of uniformly distributed clamping grooves 45 are formed on the right side surface of the left arc-shaped clamping member 41. The positions of the plurality of clamping grooves 45 correspond to and are clamped with the positions of the plurality of sickle-shaped pins 61 one by one. An arc-shaped protrusion (not shown in the figure) is provided on the surface of the vertical section of the sickle-shaped pin 61 facing the right arc-shaped clamping member 62. The shape of the clamping groove 45 is adapted to the shape of the sickle-shaped pin 61.

[0038] During specific use, when the bidirectional threaded rod 32 rotates, the bidirectional threaded rod 32 drives the right arc-shaped clamping member 62 and the left arc-shaped clamping member 41 to move towards each other to clamp the fuel injector. Under the action of the first telescopic guide rod 43, it can ensure that the left arc-shaped clamping member 41 moves horizontally. When moving until the opposite surfaces of the right arc-shaped clamping member 62 and the left arc-shaped clamping member 41 are attached together, at this time, the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62 jointly clamp the fuel injector to complete the limiting of the fuel injector.

[0039] As Figure 5 and Figure 7As shown, the connecting member 64 includes a plurality of telescopic guide rods II 644 fixedly connected to the support frame 1. The left ends of the plurality of telescopic guide rods II 644 are fixedly connected together with an installation sleeve plate 641. An installation back plate 642 is slidably connected up and down inside the installation sleeve plate 641. A power cylinder 643 is fixedly connected to the right side surface of the installation sleeve plate 641. The telescopic end of the power cylinder 643 is fixedly connected to the lower surface of the installation back plate 642 through a connecting bar. The bidirectional threaded rod 32 is threadedly connected to both the left installation back plate 44 and the installation sleeve plate 641.

[0040] During specific use, when the bidirectional threaded rod 32 drives the right arc-shaped clamping member 62 to move through the connecting member 64, at this time, the bidirectional threaded rod 32 drives the installation back plate 642 to move through the installation sleeve plate 641, and the installation back plate 642 drives the right arc-shaped clamping member 62 to move synchronously. When the right arc-shaped clamping member 62 fits with the left arc-shaped clamping member 41, at this time, the sickle-shaped pin 61 is inserted into the inside of the clamping groove 45. Then, the power cylinder 643 extends to drive the installation back plate 642 to move downward inside the installation sleeve plate 641, and the vertical section of the sickle-shaped pin 61 is clamped inside the clamping groove 45. Through the setting of the arc-shaped protrusion on the sickle-shaped pin 61, the clamping between the right arc-shaped clamping member 62 and the left arc-shaped clamping member 41 can be made tighter.

[0041] As Figure 1 and Figure 9 shown, the bottom sealing mechanism 2 includes a first hydraulic cylinder 24 fixedly connected to the upper surface of the bottom end of the support frame 1. The top end of the first hydraulic cylinder 24 is fixedly connected with a connecting plate 22. A rubber sealing pad 21 is fixedly connected to the upper surface of the connecting plate 22. A plurality of limit telescopic rods 23 are fixedly connected to the lower surface of the connecting plate 22 in a circumferential array. The bottom ends of the limit telescopic rods 23 are fixedly connected to the support frame 1.

[0042] As Figure 1 、 Figure 4 and Figure 6 shown, the lateral air delivery mechanism 5 includes two sealing sleeves 53 symmetrically distributed left and right between the opposite surfaces of the left clamping mechanism 4 and the right clamping mechanism 6. A plurality of telescopic connecting rods 52 are fixedly connected to the opposite surfaces of the two sealing sleeves 53. The right ends of the plurality of telescopic connecting rods 52 on the right side are fixedly connected together with a sliding plate 51. A through groove is provided at the position corresponding to the sliding plate 51 on the right installation back plate 642. A plurality of limit connecting rods 54 are fixedly connected inside the through groove. The circumferential surfaces of the plurality of limit connecting rods 54 are elastically slidably connected with the sliding plate 51 in the up and down direction. The sliding plate 51 is slidably matched with the through groove in the up and down direction.

[0043] As Figure 1 、 Figure 4 and Figure 6As shown, the left side surface of the left sealing sleeve 53 is fixedly and penetratingly connected with an air supply connecting pipe. A through hole with a diameter larger than that of the air supply connecting pipe is opened at the position corresponding to the air supply connecting pipe on the left mounting back plate 44. The left end of the air supply connecting pipe penetrates through the through hole on the left mounting back plate 44.

[0044] During specific use, after fixing the fuel injector, the first hydraulic cylinder 24 extends to drive the connecting plate 22 to move upward, pressing the rubber gasket 21 against the bottom end of the fuel injector. At the same time, the second hydraulic cylinder 72 contracts, and through the linkage plate 75 and the limiting slide rod 73, the sealing cover 74 is pushed downward to press against the top end of the fuel injector. Then, the sealing performance of the fuel injector is detected. First, air is supplied through the air supply connecting pipe on the left sealing sleeve 53 to keep the top and bottom ends of the fuel injector sealed. Then, observe the equipment reading to detect whether there is insufficient sealing at the oil return port position. When the sealing performance of the oil return port position is qualified, at this time, maintain the pressure inside the oil return port of the sealing sleeve 53, and then supply pressurized gas through the sealing cover 74. Then, observe the equipment reading to detect whether there is insufficient sealing at the bottom end of the fuel injector. When all detections are completed, open the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62, take out the fuel injector, and repeat the above steps for the sealing performance of the next fuel injector.

[0045] Working principle: During specific use, first remove the connecting frame 71 from the top of the support frame 1, then place the fuel injector between the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62, and press the bottom end of the fuel injector against the upper surface of the rubber gasket 21. At this time, then snap the connecting frame 71 onto the top of the support frame 1. Then, through the synchronous transmission mechanism 3, drive the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62 to move towards each other, and at the same time drive the sealing sleeve 53 to move synchronously. The sealing sleeve 53 wraps the oil return port of the fuel injector, and at the same time, the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62 clamp the fuel injector. Then, the first hydraulic cylinder 24 extends and the second hydraulic cylinder 72 contracts to seal the upper and lower ends of the fuel injector. Then, the sealing performance of the fuel injector is detected. First, air is supplied through the air supply connecting pipe on the left sealing sleeve 53 to keep the top and bottom ends of the fuel injector sealed. Then, observe the equipment reading to detect whether there is insufficient sealing at the oil return port position. When the sealing performance of the oil return port position is qualified, at this time, maintain the pressure inside the oil return port of the sealing sleeve 53, and then supply pressurized gas through the sealing cover 74. Then, observe the equipment reading to detect whether there is insufficient sealing at the bottom end of the fuel injector. When all detections are completed, open the left arc-shaped clamping member 41 and the right arc-shaped clamping member 62, take out the fuel injector, and repeat the above steps for the sealing performance of the next fuel injector.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0047] In addition, the terms "first", "second", "No. 1", "No. 2" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "No. 1", "No. 2" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0048] In the present invention, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The embodiments of the present specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A fuel injection nozzle assembly detection device, comprising a support frame (1), characterized in that: A top air delivery mechanism (7) is arranged at the top of the support frame (1), a left clamping mechanism (4) and a right clamping mechanism (6) for clamping the fuel injector are arranged at the left and right ends of the inner side of the support frame (1), a lateral air delivery mechanism (5) is arranged on the left clamping mechanism (4) and the right clamping mechanism (6), a synchronous transmission mechanism (3) for driving the left clamping mechanism (4) and the right clamping mechanism (6) to move synchronously is arranged on the support frame (1), and a bottom sealing mechanism (2) is arranged at the inner bottom end of the support frame (1); The right clamping mechanism (6) comprises a connecting member (64) arranged on the supporting frame (1), the left side of the connecting member (64) being fixedly connected to two right arc-shaped clamping members (62) distributed vertically, and the left side of the right arc-shaped clamping member (62) being evenly distributed with a plurality of sickle-shaped latches (61); The connecting member (64) comprises a plurality of telescopic guide rods (644) fixedly connected to the support frame (1); the left ends of the plurality of telescopic guide rods (644) are commonly fixedly connected to a mounting plate (641); the interior of the mounting plate (641) is slidably connected to a right mounting back plate (642); the right side surface of the mounting plate (641) is fixedly connected to an electric push rod (643); the telescopic end of the electric push rod (643) is fixedly connected to the lower surface of the right mounting back plate (642) via a connecting strip.

2. The fuel injection nozzle assembly detection device according to claim 1, characterized in that: The bottom sealing mechanism (2) comprises a first hydraulic cylinder (24) fixedly connected to the upper surface of the bottom end of the support frame (1); a connecting plate (22) is fixedly connected to the top end of the first hydraulic cylinder (24); a rubber sealing pad (21) is fixedly connected to the upper surface of the connecting plate (22); a plurality of position-limiting telescopic rods (23) are fixedly connected to the lower surface of the connecting plate (22) in a circular array; and the bottom ends of the position-limiting telescopic rods (23) are fixedly connected to the support frame (1).

3. The fuel injection nozzle assembly detection device according to claim 1, characterized in that: The synchronous transmission mechanism (3) comprises two front-to-rear symmetrical support columns (31) fixedly connected to the bottom end of the support frame (1); two bidirectional threaded rods (32) distributed up and down are rotatably connected to the support columns (31); the left end of the bidirectional threaded rod (32) is fixedly connected to a transmission pulley (33); the left side of the transmission pulley (33) is rotatably connected to the support frame (1) via a connecting shaft (34); and the right end of the bidirectional threaded rod (32) is rotatably connected to the support frame (1).

4. The fuel injection nozzle assembly detection device according to claim 1, characterized in that: The left clamping mechanism (4) comprises a plurality of evenly distributed telescopic guide rods (43) fixedly connected to the left end of the interior of the support frame (1); the right ends of the plurality of telescopic guide rods (43) are commonly fixedly connected to a left mounting back plate (44); the right side surface of the left mounting back plate (44) is fixedly connected to two left arc-shaped clamping members (41) distributed up and down; the right side surface of the left arc-shaped clamping member (41) is provided with a plurality of evenly distributed snap-in grooves (45); the positions of the plurality of snap-in grooves (45) correspond one-to-one to the positions of the plurality of sickle-shaped snap-in pins (61) and are snap-fitted.

5. The fuel injection nozzle assembly detection device according to claim 4, characterized in that: The lateral gas delivery mechanism (5) comprises two left-right symmetrically distributed sealing sleeves (53) arranged between the opposite surfaces of the left clamping mechanism (4) and the right clamping mechanism (6); a plurality of telescopic connecting rods (52) are fixedly connected on the opposite back surfaces of the two sealing sleeves (53); the right ends of the plurality of telescopic connecting rods (52) on the right side are commonly fixedly connected to a sliding plate (51); a plurality of limit connecting rods (54) uniformly distributed in the front-back direction are passed through the upper surface of the sliding plate (51) and elastically slidably connected thereto; the limit connecting rods (54) are fixedly connected to the right clamping mechanism (6).

6. The fuel injection nozzle assembly detection device according to claim 1, characterized in that: The top gas delivery mechanism (7) comprises a connecting frame (71) clamped on the top of the supporting frame (1); the upper surface of the connecting frame (71) is fixedly connected to two second hydraulic cylinders (72) that are symmetrical in front and back; the tops of the two second hydraulic cylinders (72) are commonly fixedly connected to a linkage plate (75); the lower surface of the linkage plate (75) is fixedly connected to two limit slide bars (73) that are distributed in the front and back; the bottom ends of the limit slide bars (73) penetrate the lower surface of the connecting frame (71); and the bottom ends of the two limit slide bars (73) are commonly fixedly connected to a sealing cover (74).

7. The fuel injection nozzle assembly detection device according to claim 6, characterized in that: A sealing ring is provided on the lower surface of the sealing cover (74), and an air intake pipe is connected through the upper surface of the sealing cover (74).

8. The fuel injection nozzle assembly detection device according to claim 4, characterized in that: A curved protrusion is provided on the vertical section of the sickle-shaped latch (61), and the shape of the latching groove (45) matches the shape of the sickle-shaped latch (61).

9. The fuel injection nozzle assembly detection device according to claim 5, characterized in that: A gas connection pipe is fixed to the left side surface of the left sealing sleeve (53) and penetrates through it; a through hole having a diameter larger than that of the gas connection pipe is provided at a position on the left mounting back plate (44) corresponding to the gas connection pipe; and the left end of the gas connection pipe penetrates through the through hole on the left mounting back plate (44).

10. The fuel injection nozzle assembly detection device according to claim 3, characterized in that: A drive motor is mounted on the upper surface of the bottom end of the support frame (1) via a motor seat, a belt pulley is fixedly connected to the output shaft of the drive motor, and the belt pulley is transmission-connected to a plurality of transmission pulleys (33) via a belt.

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