A process for the manufacture of a diesel engine fuel injector

Abstract

The application discloses a diesel engine injector manufacturing process, two ends between the top of the oil collecting tank are fixedly connected with U-shaped supports, the inside of the U-shaped supports is slidably connected with a lifting plate, the bottom of the lifting plate is equidistantly provided with a plurality of trapezoidal limiting covers, the top of the oil collecting tank is detachably connected with a frame plate, the manufacturing process of the engine injector is additionally provided with injection time detection after traditional sealing test and injection amount test, the opening and closing time of the electromagnetic coil inside the injector can be calculated, and the over-injection or insufficient injection of the injector is avoided; the injection time detection device in the process is provided with a transmission plate, when oil is sprayed, the transmission plate is impacted, pressure change and pressure change time are sensed through a pressure sensor, so that the injection time is calculated, a triangular block is arranged on one of the transmission plates, so that the transmission plate can be applicable to the shaft needle type electromagnetic injector and the ball valve type electromagnetic injector, and the adaptability of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine fuel injector manufacturing, and particularly relates to a diesel engine fuel injector manufacturing process. BACKGROUND

[0002] The diesel engine is an engine that relies on burning diesel to release energy, and is widely used in trucks, agricultural equipment and large and medium-sized heavy trucks due to its large torque and good economic performance. The fuel injector in the diesel engine is a device that injects fuel, which is as important as blood vessels in blood transfusion. Therefore, the fuel injector manufacturing is strict.

[0003] In the prior art, after the production of the fuel injector of the diesel engine is completed, only the fuel injection amount and the sealing performance are tested, and the opening and closing of the electromagnetic coil inside the fuel injector are also very important components. If the electromagnetic coil is unqualified, it will cause unqualified fuel injection time, long fuel injection time, large fuel consumption, and short fuel injection time, which will cause insufficient power. SUMMARY

[0004] The purpose of the present application is to provide a diesel engine fuel injector manufacturing process to solve the above problems.

[0005] In order to solve the above problems, the present application provides a technical scheme:

[0006] A diesel engine fuel injector manufacturing process, comprising the following steps:

[0007] T1, each part of the fuel injector enters the factory, and the parts entering the factory are technically counted. After the counting is completed, the parts are placed in the warehouse, and when production is needed, the same amount of each component is taken out from the warehouse;

[0008] T2, the parts taken out from the warehouses are assembled and formed, and the finished products after assembly cannot be directly stored in the warehouse, and need to be sampled and detected;

[0009] T3, the sampling and detection includes sealing test, fuel injection amount test and fuel injection time test, and a plurality of fuel injectors are randomly selected from the products for detection, and the fuel injector detection includes the following steps:

[0010] S1, the sealing test is used to detect whether the fuel injector leaks oil and whether the oil leakage is serious, and the unqualified samples are collected;

[0011] S2, the oil injection amount test is performed on the qualified samples to detect whether the oil injection amount of the fuel injector is qualified, so as to avoid too small or too large oil injection amount of the oil outlet, and the unqualified samples are collected;

[0012] S3, the last step of oil injection time detection is carried out on the qualified samples, through the detection of the oil injection time, whether the power-off and power-on of the electromagnetic valve in the oil injector is within the qualified range is calculated, if the oil injection time is too long, the fuel consumption is large, and if the oil injection time is too short, the power is insufficient, and the unqualified samples are collected;

[0013] T4, the qualified rate of the samples that are unqualified after three times of detection and the qualified samples is calculated, if the qualified rate is within the standard range, the products are cleaned and packaged and sent to the warehouse, if the qualified rate is out of the standard range, the whole batch of products is discarded and recycled.

[0014] As a preferred technical solution of the present application, the top of the oil collecting tank is fixedly connected with a U-shaped support between both ends, the inside of the U-shaped support is slidably connected with a lifting plate, the bottom of the lifting plate is equidistantly provided with a plurality of trapezoidal limiting covers, the top of the oil collecting tank is detachably connected with a shelf plate, the position of the shelf plate relative to the trapezoidal limiting cover is excavated to form a trapezoidal placing groove, the trapezoidal placing groove penetrates the shelf plate, the bottom of the shelf plate and one side of each trapezoidal placing groove is provided with a transmission plate, and one side of the transmission plate is provided with a pressure sensor.

[0015] As a preferred technical solution of the present application, the top of the U-shaped support is threadedly connected with a threaded rod in the middle, the bottom of the threaded rod is rotatably connected with the middle of the lifting plate, the top of the lifting plate and both sides of the threaded rod are fixedly connected with a second limiting rod, the top of the second limiting rod is inserted into the U-shaped support, both ends of the lifting plate are fixedly connected with a sliding block, and the inner wall of both sides of the U-shaped support is excavated to form a sliding groove relative to the sliding block.

[0016] As a preferred technical solution of the present application, the top of each trapezoidal limiting cover is fixedly connected with a first limiting rod, the top of the first limiting rod is inserted into the lifting plate, and the first limiting rod is sleeved with a spring between the trapezoidal limiting cover and the lifting plate, and both ends of the spring are fixedly connected with the trapezoidal limiting cover and the lifting plate.

[0017] As a preferred technical solution of the present application, the bottom of the shelf plate and between the adjacent two trapezoidal placing grooves is fixedly connected with a baffle, and the contact of the pressure sensor is fixedly connected with the baffle.

[0018] As a preferred technical solution of the present application, one of the sides of the trapezoidal placing groove is fixedly connected with a triangular block at the bottom, and the triangular block extends to the lower middle part of the trapezoidal placing groove.

[0019] As a preferred technical solution of the present application, the pressure sensor is electrically connected with a timer.

[0020] As a preferred embodiment of the present invention, the bottom of the oil collection tank is provided with an inclined groove, and the oil collection tank is provided with an oil outlet at the bottom of the inclined groove.

[0021] The beneficial effects of this invention are as follows: After the traditional sealing test and fuel injection quantity test, the manufacturing process of this engine injector adds the detection of fuel injection time, which can calculate the switching and de-energizing time of the electromagnetic coil inside the injector, thus avoiding excessive or insufficient fuel injection.

[0022] The injection time detection device in this process is equipped with a transmission plate. When the oil is sprayed out, it impacts the transmission plate. The pressure sensor senses the pressure change and the time of pressure change, thereby calculating the injection time. A triangular block is provided on one of the transmission plates, which makes the transmission plate compatible with both pin-type and ball-valve-type electromagnetic injectors, improving the compatibility of the device. Attached image description:

[0023] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the flowchart structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the fuel injection time detection device of the present invention;

[0026] Figure 3 This is a cross-sectional structural diagram of the fuel injection time detection device of the present invention;

[0027] Figure 4 This is an enlarged structural diagram of point A in the present invention;

[0028] Figure 5 This is an enlarged structural diagram of point B in the present invention.

[0029] In the diagram: 1. Oil collection tank; 2. U-shaped bracket; 3. Threaded rod; 4. Lifting plate; 5. Slide groove; 6. Sliding block; 7. Trapezoidal limit cover; 8. Limit rod No. 1; 9. Spring; 10. Limit rod No. 2; 11. Frame plate; 12. Trapezoidal placement groove; 13. Baffle; 14. Transmission plate; 15. Triangular block; 16. Pressure sensor; 17. Inclined groove; 18. Oil outlet. Detailed implementation method:

[0030] like Figures 1-4 As shown, this specific embodiment adopts the following technical solution: a diesel engine injector manufacturing process, including the following steps:

[0031] T1. All parts of the fuel injector are brought into the factory. The incoming parts are technically inventoried. After the inventory is completed, the parts are put into the warehouse. When production is required, the same amount of each part is taken out from the warehouse.

[0032] T2, the parts taken out from each warehouse are assembled into a shape, and the finished product after assembly cannot be directly stored in the warehouse, and needs to be sampled and detected;

[0033] T3, the sampling and detection includes sealing test, oil injection amount test and oil injection time test, a plurality of oil injectors are randomly selected from the products for detection, and the oil injector detection includes the following steps:

[0034] S1, whether the oil injector will leak oil and whether the leakage is serious is detected by the sealing test, and the unqualified samples are collected;

[0035] S2, the oil injection amount test is performed on the qualified samples, the oil injection amount of the oil injector is detected to avoid too small or too large oil injection amount of the oil outlet, and the unqualified samples are collected;

[0036] S3, the last step of oil injection time detection is performed on the qualified samples, through the oil injection time detection, whether the power-off and discharge of the electromagnetic valve in the oil injector is within the qualified range is calculated, the oil consumption is large when the oil injection time is too long, and the power is insufficient when the oil injection time is too short, and the unqualified samples are collected;

[0037] T4, the qualified rate of the unqualified samples and the qualified samples after three detections is calculated, if the qualified rate is within the standard range, the products are cleaned, packaged and sent to the warehouse, if the qualified rate is outside the standard range, the whole batch of products is scrapped and recycled.

[0038] The U-shaped support 2 is fixedly connected between the top of the oil collecting tank 1, the lifting plate 4 is slidably connected in the U-shaped support 2, the bottom of the lifting plate 4 is equally spaced a plurality of trapezoidal limiting covers 7, the top of the oil collecting tank 1 is detachably connected with the shelf plate 11, the trapezoidal placement groove 12 is opened and excavated in the position of the shelf plate 11 relative to the trapezoidal limiting cover 7, the trapezoidal placement groove 12 penetrates the shelf plate 11, the bottom of the shelf plate 11 and one side of each trapezoidal placement groove 12 are provided with a transmission plate 14, one side of the transmission plate 14 is provided with a pressure sensor 16, when the oil is sprayed, it impacts on the transmission plate 14, and the pressure change and pressure change time are sensed by the pressure sensor 16, so as to calculate the oil injection time.

[0039] The middle of the top end of the U-shaped support 2 is threadedly connected with a threaded rod 3, the bottom of the threaded rod 3 is rotationally connected with the middle of a lifting plate 4, the top of the lifting plate 4 and on both sides of the threaded rod 3 is fixedly connected with two limiting rods 10, the top of the two limiting rods 10 is inserted with the U-shaped support 2, both ends of the lifting plate 4 is fixedly connected with sliding blocks 6, the inner walls of both sides of the U-shaped support 2 are provided with sliding grooves 5 at positions corresponding to the sliding blocks 6, the sliding blocks 6 are slidingly connected with the sliding grooves 5, the top of each trapezoidal limiting cover 7 is fixedly connected with a limiting rod 8, the top of the limiting rod 8 is inserted with the lifting plate 4, the limiting rod 8 is sleeved with a spring 9 between the trapezoidal limiting cover 7 and the lifting plate 4, both ends of the spring 9 are fixedly connected with the trapezoidal limiting cover 7 and the lifting plate 4 respectively, the bottom of a shelf plate 11 and between two adjacent trapezoidal placing grooves 12 is fixedly connected with a baffle 13, the contact of a pressure sensor 16 is fixedly connected with the baffle 13, when the transmission plate 14 is freely vertical, the contact of the pressure sensor 16 is in contact with the transmission plate 14.

[0040] One of the bottom sides of the trapezoidal placing groove 12 is fixedly connected with a triangular block 15, the triangular block 15 extends to below the middle of the trapezoidal placing groove 12, the pressure sensor 16 is electrically connected with a timer, the oil impacts on the transmission plate 14 and the triangular block 15, the bottom of the transmission plate 14 impacted by the oil is opened to both sides, and is in contact with the contact of the pressure sensor 16 installed on the baffle 13, the oil injection time of the oil injector can be calculated by calculating the numerical change of the pressure sensor 16, the inside bottom of the oil collecting tank 1 is provided with an inclined chute 17, the oil outlet 18 is arranged at the bottom of the inclined chute 17, the oil is collected to the oil outlet 18 through the guidance of the inclined chute 17, and the oil is conveniently recycled.

[0041] Specifically, the oil injection time detection device of the diesel engine oil injector manufacturing process is used, first, the oil outlet end of the oil injector is inserted into the trapezoidal placing groove 12 in sequence, the threaded rod 3 at the top is rotated, with the rotation of the threaded rod 3, the lifting plate 4 drives the trapezoidal placing groove 12 at the bottom to descend, the oil injector is inserted at the bottom and is extruded and positioned, which prevents the oil injector from being displaced during detection, because the top of the trapezoidal limiting cover 7 is provided with the spring 9, the oil injector is prevented from being excessively extruded, after the oil injector is connected with the oil pipe, the electromagnetic coil of the oil injector is turned on, the oil outlet end of the oil injector sprays oil after the electromagnetic coil is turned on, the oil of different models of oil injectors impacts on different positions, the oil impacts on the transmission plate 14 and the triangular block 15, the bottom of the transmission plate 14 impacted by the oil is opened to both sides, and is in contact with the contact of the pressure sensor 16 installed on the baffle 13, the oil injection time of the oil injector can be calculated by calculating the numerical change of the pressure sensor 16, whether the electromagnetic valve of the oil injector is qualified can be calculated, and the discharge amount of the oil injector is prevented from being too large or too small.

[0042] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application, and the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An injection time detecting device for a diesel engine injector manufacturing, comprising an oil collecting tank (1), characterized in that: The top of the oil collecting tank (1) is fixedly connected with a U-shaped support (2), the inside of the U-shaped support (2) is slidably connected with a lifting plate (4), the bottom of the lifting plate (4) is equidistantly provided with a plurality of trapezoidal limiting covers (7), the top of the oil collecting tank (1) is detachably connected with a shelf plate (11), the position of the shelf plate (11) relative to the trapezoidal limiting cover (7) is excavated with a trapezoidal placing groove (12), the trapezoidal placing groove (12) penetrates the shelf plate (11), the bottom of the shelf plate (11) and one side of each trapezoidal placing groove (12) is provided with a transmission plate (14), one side of the transmission plate (14) is provided with a pressure sensor (16); The bottom of the shelf plate (11) and between the adjacent two trapezoidal placing grooves (12) are fixedly connected with a baffle (13), the contact of the pressure sensor (16) is fixedly connected with the baffle (13), when the transmission plate (14) is free and vertical, the contact of the pressure sensor (16) is in contact with the transmission plate (14); One side of the bottom of the trapezoidal placing groove (12) is fixedly connected with a triangular block (15), the triangular block (15) extends to the middle part below the trapezoidal placing groove (12).

2. A fuel injection time detecting device for manufacturing a fuel injector of a diesel engine according to claim 1, characterized in that: The top end of the U-shaped support (2) is threadedly connected with a threaded rod (3), the bottom of the threaded rod (3) is rotatably connected with the middle part of the lifting plate (4), the top of the lifting plate (4) and on both sides of the threaded rod (3) are fixedly connected with a second limiting rod (10), the top of the second limiting rod (10) is inserted into the U-shaped support (2), both ends of the lifting plate (4) are fixedly connected with a sliding block (6), the inner wall of both sides of the U-shaped support (2) is excavated with a sliding groove (5) relative to the position of the sliding block (6), the sliding block (6) is slidably connected with the sliding groove (5).

3. A fuel injection time detecting device for manufacturing a fuel injector of a diesel engine according to claim 2, characterized in that: The top of each trapezoidal limiting cover (7) is fixedly connected with a first limiting rod (8), the top of the first limiting rod (8) is inserted into the lifting plate (4), the first limiting rod (8) is sleeved with a spring (9) between the trapezoidal limiting cover (7) and the lifting plate (4), both ends of the spring (9) are fixedly connected with the trapezoidal limiting cover (7) and the lifting plate (4) respectively.

4. A fuel injection time detecting device for manufacturing a fuel injector of a diesel engine according to claim 3, characterized in that: The pressure sensor (16) is electrically connected with a timer.

5. A fuel injection time detecting device for manufacturing a fuel injector of a diesel engine according to claim 4, characterized in that: The inside of the bottom of the oil collecting tank (1) is provided with an inclined chute (17), the bottom of the oil collecting tank (1) is provided with an oil outlet (18).

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