Device for controlling press-in displacement of sealing steel ball of oil injector body

Abstract

The utility model discloses a device for controlling the press-in displacement of a sealing steel ball of an oil injector body, which is characterized by comprising a base, the stand column is vertically mounted on one side of the base; the servo electric cylinder is mounted at the upper end of the stand column; the pressure sensor is fixed on a piston rod of the servo electric cylinder; the pressure head is fixed at the lower end of the pressure sensor and is used for pressing the sealing steel ball; the supporting assembly is installed on the base and used for supporting and positioning the oil sprayer body. According to the device, accurate control over the pressing-in displacement of the steel ball is achieved, the consistency of the pressing-in depth of the steel ball is guaranteed, therefore, the sealing performance of the oil injector body is improved, the fuel oil leakage risk is reduced, the quality and reliability of the common rail oil injector are improved, and the device has wide application prospects and remarkable economic benefits.

Description

Technical Field

[0001] This utility model belongs to the field of common rail injector body assembly technology, and particularly relates to a device for controlling the displacement of the sealing steel ball of the injector body. Background Technology

[0002] In the manufacturing of common rail injectors, sealing the process orifice of the injector body is a crucial process step. This orifice is typically sealed with a steel ball, which is press-fitted into the injector body. This press-fit requires the steel ball to have a certain depth of penetration; only in this way can a reliable seal be formed between the steel ball and the injector body, preventing fuel leakage and other problems, thereby ensuring the normal operation of the common rail injector and the stable operation of the entire fuel injection system.

[0003] In actual production, the steel ball hole of the injector body is located on the forged blank surface of the injector body. However, the diameter of the blank fluctuates within a certain range, specifically within ±0.5mm. This difference in blank diameter significantly affects subsequent processing. When using a pneumatic-hydraulic booster cylinder to press the steel ball, a dead limit is usually set for the pressure head. However, because the chamfer above the sealing hole diameter of the actually machined injector body varies in size due to the influence of the blank, the depth of steel ball insertion during the pressing process will be inconsistent. Specifically, the distance between the top of the steel ball and the outer surface of the injector body after pressing is different, resulting in inconsistent positions of the actual sealing hole diameter where the steel ball is located.

[0004] When using the dead limit of the pressure head to adjust the steel ball depth, a difficult problem arises. Because it's impossible to find an injector body that perfectly matches the median insertion depth in the drawings to adjust the pressure head's descent displacement, the effective position of the steel ball pressed into the steel ball hole varies. This difference directly leads to unstable sealing performance and poses a serious sealing hazard. If the seal is unreliable, fuel may leak from the process orifice, affecting not only the injection accuracy and quantity control of the common rail injector but also negatively impacting the performance and reliability of the entire fuel injection system, increasing the probability of malfunctions, raising maintenance costs, and potentially even causing safety accidents.

[0005] In summary, existing methods using pneumatic-hydraulic booster cylinders and pressure head dead-limiting mechanisms cannot effectively control the insertion depth of the steel balls when pressing them into the common rail injector body, making it difficult to meet the stringent sealing performance requirements of common rail injectors. Therefore, it is necessary to develop a device that can effectively control the insertion depth of the steel balls and ensure sealing performance. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a device for controlling the displacement of the sealing steel ball in the injector body.

[0007] This invention is implemented as follows: a device for controlling the displacement of the sealing steel ball in an injector body, characterized in that it includes a base; a column, which is vertically installed on one side of the base; a servo electric cylinder, which is installed on the upper end of the column; a pressure sensor, which is fixed on the piston rod of the servo electric cylinder; a pressure head, which is fixed on the lower end of the pressure sensor for pressing the sealing steel ball; and a support assembly, which is installed on the base for supporting and positioning the injector body.

[0008] Preferably, the support assembly includes: a horizontal support plate fixed on the base; a positioning sleeve support plate disposed on the horizontal support plate for supporting one end of the injector body; and two positioning support blocks disposed on the horizontal support plate for supporting the injector body, wherein the middle positioning support block is used for positioning the flat part of the injector body to ensure that the steel ball hole of the injector body is vertically upward and coaxial with the pressure head.

[0009] Preferably, the horizontal support plate has a positioning pin at its center, and the positioning pin is mounted on the base.

[0010] Preferably, plunger springs are installed on both sides of the positioning support block located in the middle.

[0011] The advantages and technical effects of this utility model are as follows: The device and its method for controlling the displacement of the sealing steel ball of the injector body effectively solve the sealing problem caused by inconsistent steel ball insertion depth in the prior art, and have significant technical advantages.

[0012] In terms of device structure, the support components are ingeniously and practically designed. A horizontal support plate is fixed to the base, providing a stable foundation for the entire support structure. The positioning sleeve support plate prevents damage to the external threads of the injector body's large end from impact. Two positioning support blocks work together; the middle positioning support block accurately positions the injector body's flat side, ensuring the steel ball hole is vertically upward and coaxial with the pressure head, greatly improving press-fit accuracy. The positioning pin in the center of the horizontal support plate further ensures installation accuracy, reducing the impact of installation errors on the press-fit effect. The plunger springs installed on both sides of the middle positioning support block effectively prevent the injector body from shifting after positioning, enhancing positioning reliability.

[0013] In terms of operation, this device precisely controls the piston rod movement using a servo electric cylinder, with a pressure sensor providing the initial displacement signal. When the pressure head contacts the steel ball, the initial force is set to a certain pressure value detected by the pressure sensor as the "0" point. Upon receiving the signal, the servo motor begins calculating the piston displacement. When the displacement reaches the preset steel ball insertion depth H, the servo motor reverses, and the pressure head returns to its original position. This control method effectively reduces the influence of positioning fixtures and workpiece dimensional variations on the insertion position, ensuring that the steel ball is consistently pressed into the injector body's steel ball hole each time.

[0014] In summary, this device and its application method achieve precise control of the steel ball insertion displacement, ensuring the consistency of the steel ball insertion depth, thereby improving the sealing performance of the injector body, reducing the risk of fuel leakage, and improving the quality and reliability of the common rail injector. It has broad application prospects and significant economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 Side view;

[0017] Figure 3 yes Figure 2 Enlarged view of the middle section (I);

[0018] Figure 4 yes Figure 3 Sectional view of AA;

[0019] Figure 5 This is a diagram showing the state where the sealing steel ball has not been pressed in.

[0020] Figure 6 This is a diagram showing the state of the sealing steel ball being pressed in.

[0021] In the diagram: 1. Base; 2. Column; 3. Servo electric cylinder; 4. Pressure sensor; 5. Pressure head; 6. Support assembly; 61. Horizontal support plate; 62. Positioning sleeve support plate; 63. Positioning support block; 64. Positioning pin; 7. Piston spring; 8. Sealing steel ball; 9. Steel ball hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0023] Please see Figures 1 to 4A device for controlling the pressing displacement of the sealing steel ball in a fuel injector body includes a base 1; a column 2 vertically mounted on one side of the base; a servo electric cylinder 3 mounted on the upper end of the column; a pressure sensor 4 fixed to the piston rod of the servo electric cylinder; a pressure head 5 fixed to the lower end of the pressure sensor for pressing the sealing steel ball; and a support assembly 6 mounted on the base for supporting and positioning the fuel injector body. This device for controlling the pressing displacement of the sealing steel ball in the fuel injector body, through precise control of the piston rod movement by the servo electric cylinder and the displacement initiation signal provided by the pressure sensor, effectively controls the pressure head displacement, ensuring consistent steel ball pressing depth and solving the sealing hazard problem caused by inconsistent steel ball pressing depth in existing technologies.

[0024] Preferably, the support assembly 6 includes: a horizontal support plate 61 fixed on the base; a positioning sleeve support plate 62 disposed on the horizontal support plate for supporting one end of the injector body and preventing the external thread of the large end of the injector body from being bumped; and two positioning support blocks 63 disposed on the horizontal support plate for supporting the injector body, with the middle positioning support block used for positioning the flat part of the injector body to ensure that the steel ball hole of the injector body is vertically upward and coaxial with the pressure head.

[0025] Preferably, the horizontal support plate has a positioning pin 64 at its center, which is installed on the base to ensure installation accuracy.

[0026] Preferably, plunger springs 7 are installed on both sides of the positioning support block located in the middle. This ensures that the injector body will not move after being positioned, thus ensuring the reliability of the positioning.

[0027] Usage instructions: Please refer to Figure 5 and Figure 6 When the piston of the servo electric cylinder extends downwards, the pressure head moves downwards accordingly. When the pressure head contacts the sealing steel ball 8, it experiences an upward force from the sealing steel ball. This initial force (e.g., 100N) can be set as the starting point for the sealing steel ball to be pressed in, indicated by the pressure sensor detecting a certain pressure value. The servo motor on the servo electric cylinder receives the "0" signal from the pressure sensor, and the control system begins calculating the displacement of the servo electric cylinder piston from this point until the piston displacement reaches the system-set sealing steel ball pressing depth H. At this point, the servo motor reverses, and the pressure head returns to its original position along with the servo electric cylinder piston. This reduces inconsistencies in the pressing position caused by dimensional variations in the positioning fixture and workpiece shape, ensuring a consistent position of the sealing steel ball within the injector body's steel ball hole 9, thus guaranteeing a tight seal.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for controlling the press-in displacement of a sealing steel ball of an oil injector body, characterized in that Including the base; A column, which is vertically installed on one side of the base; A servo electric cylinder is installed at the upper end of the column; A pressure sensor is fixed to the piston rod of the servo electric cylinder; The pressure head, fixed to the lower end of the pressure sensor, is used to press and install the sealing steel ball; A support assembly, mounted on the base, is used to support and position the injector body.

2. The apparatus of claim 1, wherein: The support assembly includes: a horizontal support plate, fixed on the base; A positioning sleeve support plate is set on the horizontal support plate to support both ends of the injector body; Two positioning support blocks are set on the horizontal support plate to support the injector body. The positioning support block in the middle is used to position the injector body flat to ensure that the steel ball hole of the injector body is vertically upward and coaxial with the pressure head.

3. The apparatus of claim 2, wherein: A positioning pin is provided at the center of the horizontal support plate, and the positioning pin is installed on the base.

4. The apparatus of claim 2, wherein: Piston springs are installed on both sides of the positioning support block located in the middle.

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