Measuring device for a gas fuel injector

Abstract

The application provides a measuring device for a gas fuel injector, and relates to the technical field of gas fuel injector measurement. The measuring device comprises a workbench assembly, which is used for connecting a gas fuel injector to be measured; a measuring assembly, one part of which is connected with the workbench assembly, and the other part of which is movably arranged relative to the one part of the measuring assembly; and a tensioning assembly, which is detachably connected with the measuring assembly, has an original initial state, and has a deformed state in which the tensioning assembly is deformed, and is used for connecting with a middle hole of an armature of the gas fuel injector to be measured. When the tensioning assembly is in the deformed state, the measuring assembly drives the tensioning assembly to move away from the gas fuel injector to be measured, and the measuring assembly measures the force between the measuring assembly and the tensioning assembly during the movement, thereby solving the problem of low measurement precision of a residual air gap and spring pre-tightening force of the gas fuel injector in the prior art.

Description

Technical Field

[0001] This invention relates to the field of gas fuel injector measurement technology, and more specifically, to a measuring device for gas fuel injectors. Background Technology

[0002] The application of gaseous fuels in vehicle and marine engines is becoming increasingly widespread. Among these applications, the gas injector is a crucial component of the fuel supply system for new energy engines, significantly impacting engine performance and emissions. The gas injector achieves precise control of the gas passage's opening and closing and dynamic response by precisely controlling the residual air gap and spring preload of the electromagnet, thereby enabling precise control of the jet volume. Therefore, the design and development of gas injectors require precise measurement and adjustment of the residual air gap and spring preload.

[0003] In the existing technology, traditional indirect measurement methods have large errors and low accuracy when measuring the residual air gap and spring preload of gas fuel injectors, and these two parameters cannot be measured directly, which affects the performance consistency and reliability of gas injectors.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a measuring device for gas fuel injectors, so as to solve the problem of low accuracy in measuring the residual air gap and spring preload of gas fuel injectors in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, a measuring device for a gas fuel injector is provided, comprising: a worktable assembly for connecting a fuel injector to be tested; a measuring assembly, a portion of which is connected to the worktable assembly, and another portion of which is movably disposed relative to the portion of the measuring assembly; and a tensioning assembly detachably connected to the measuring assembly, the tensioning assembly having an initial state and a deformed state, the tensioning assembly being connected to the armature bore of the fuel injector to be tested; wherein, when the tensioning assembly is in the deformed state, the measuring assembly drives the tensioning assembly to move away from the fuel injector to be tested, and the measuring assembly measures the force between the measuring assembly and the tensioning assembly during the movement.

[0007] Furthermore, the measuring component includes: a telescopic sub-assembly, a portion of which is connected to the worktable assembly, a portion of which is connected to another portion of which is movably disposed relative to the portion of which is the telescopic sub-assembly; a connecting seat, which is connected to the other portion of which is the telescopic sub-assembly; a sensor, which is connected to the connecting seat; and a probe, which is connected to the tensioning assembly and the sensor. When the tensioning assembly is in a deformed state, the portion of the telescopic sub-assembly drives the other portion of the telescopic sub-assembly, the connecting seat, the sensor, the probe, and the tensioning assembly to move away from the fuel injector under test. The sensor measures the force between the probe and the tensioning assembly during this movement.

[0008] Further, the telescopic sub-assembly includes: a lead screw; a lead screw seat, the lead screw being connected to the lead screw seat, the lead screw seat being connected to a connecting seat, the lead screw seat being movably disposed relative to the lead screw along the axial direction of the lead screw; a drive unit, the output end of the drive unit being connected to the lead screw, and the drive unit being connected to the worktable assembly; wherein, when the tensioning assembly is in a deformed state, the drive unit drives the lead screw to rotate, so that the lead screw seat connecting seat, sensor, probe, and tensioning assembly move away from the fuel injector to be measured along the axial direction of the lead screw, and the sensor measures the force between the probe and the tensioning assembly during the movement.

[0009] Furthermore, the telescopic sub-assembly includes: a motor connected to the worktable assembly; a gear connected to the output end of the motor; and a rack connected to the connecting seat, with the rack and gear meshing together. When the tensioning assembly is in a deformed state, the motor drives the gear to rotate, causing the rack to move the connecting seat, sensor, probe, and tensioning assembly away from the fuel injector of the object under test along the height direction of the worktable assembly. The sensor measures the force between the probe and the tensioning assembly during the movement.

[0010] Furthermore, the probe includes: a probe body, which is connected to the sensor; and a mounting slot, which is connected to the tensioning assembly.

[0011] Furthermore, the tensioning assembly includes: a connecting rod connected to the probe; a clamping block arranged circumferentially along the connecting rod; a deformable block arranged circumferentially along the connecting rod, located on the side of the connecting rod away from the probe, and having an initial state and a deformed state; and a connecting block arranged circumferentially along the connecting rod, located on the side of the connecting rod away from the probe, with the clamping block positioned between the connecting block and the deformable block. When the tensioning assembly is located within the armature bore of the fuel injector of the test object, the connecting block is moved along the connecting rod towards the side away from the probe, thereby causing the clamping block to move along the connecting rod towards the deformable block, so that the deformable block is in a deformed state.

[0012] Furthermore, the workbench assembly includes: a base; a chuck connected to the base and movably disposed relative to the base, the chuck being used to connect to the fuel injector of the test object; and a bracket connected to the base and connected to the telescopic sub-assembly.

[0013] Furthermore, the worktable assembly includes: a slider connected to a support, the slider being movably disposed along the height direction of the support; a back plate connected to the slider, the back plate being connected to a telescopic sub-assembly, and the back plate being movably connected to a connecting seat.

[0014] Furthermore, the backplate includes: a first section connected to the slider; a guide rail connected to the first section, the length direction of the guide rail being set along the height direction of the bracket, and the guide rail being configured to cooperate with the connecting seat; and a second section connected to the first section and connected to the telescopic sub-assembly.

[0015] Furthermore, the base is provided with a slide groove, and the worktable assembly includes: a connecting plate, a chuck connected to the base via the connecting plate, and the connecting plate being configured to cooperate with the slide groove.

[0016] By applying the technical solution of this invention, when the tensioning component is in a deformed state and tightly fitted with the armature, the measuring component is activated, driving the tensioning component and the armature to move upward. At the same time, the force between the measuring component and the tensioning component during the movement is recorded. Based on the force-displacement curve, the spring preload and the remaining air gap of the fuel injector under test are calculated, thus solving the problem of low measurement accuracy of the remaining air gap and spring preload of gas fuel injectors in the prior art. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of a first embodiment of a measuring device for a gas fuel injector according to the present invention is shown;

[0019] Figure 2 A schematic diagram of an embodiment of a gas fuel injector according to the present invention is shown;

[0020] Figure 3 A schematic diagram of a second embodiment of a measuring device for a gas fuel injector according to the present invention is shown;

[0021] Figure 4 A schematic diagram of a third embodiment of a measuring device for a gas fuel injector according to the present invention is shown;

[0022] Figure 5A schematic diagram of the force-displacement curves measured by the measuring device for a gas fuel injector according to the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Workbench assembly;

[0025] 11. Base; 111. Slide groove;

[0026] 12. Chuck;

[0027] 13. Bracket;

[0028] 14. Slider;

[0029] 15. Back panel; 151. First section; 152. Second section; 153. Guide rail;

[0030] 16. Connecting plate;

[0031] 20. Measurement components;

[0032] 21. Expansion / Retraction Sub-component;

[0033] 211. Lead screw;

[0034] 212. Lead screw seat;

[0035] 213. Drive unit;

[0036] 22. Connecting seat;

[0037] 23. Sensors;

[0038] 24. Probe; 240. Probe body; 241. Mounting slot;

[0039] 30. Tensioning components;

[0040] 31. Connecting rod;

[0041] 32. Compactor block;

[0042] 33. Deformation block;

[0043] 34. Connecting block;

[0044] 35. Nut;

[0045] 40. Fuel injector of the test subject;

[0046] 41. Iron core;

[0047] 42. Injector upper casing;

[0048] 43. Coil;

[0049] 44. Spring;

[0050] 45. Armature; 451. Armature center hole; 452. Armature air outlet. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0055] Figure 2This is a schematic diagram of an embodiment of a gas fuel injector. The gas fuel injector 40 under test includes an iron core 41, an injector upper shell 42, a coil 43, a spring 44, and an armature 45. The armature 45 has an armature central hole 451 and an armature air outlet 452. The armature air outlet 452 is disposed therein in communication with the armature central hole 451. The iron core 41, the coil 43, and the armature 45 are sequentially disposed inside the injector upper shell 42. The iron core 41 and the upper side of the armature 45 are connected by the spring 44.

[0056] Combination Figures 1 to 5 In a specific embodiment of the present invention, a measuring device for a gas fuel injector is provided.

[0057] Specifically, the measuring device for a gas fuel injector includes a worktable assembly 10, a measuring assembly 20, and a tensioning assembly 30. The worktable assembly 10 is used to connect the gas fuel injector 40 to be tested. Part of the measuring assembly 20 is connected to the worktable assembly 10, and another part of the measuring assembly 20 is movably disposed relative to the part of the measuring assembly 20. The tensioning assembly 30 is detachably connected to the measuring assembly 20. The tensioning assembly 30 has an initial state and a deformed state. The tensioning assembly 30 is used to connect to the armature hole 451 of the gas fuel injector 40 to be tested. When the tensioning assembly 30 is in the deformed state, the measuring assembly 20 drives the tensioning assembly 30 to move away from the gas fuel injector 40 to be tested, and the measuring assembly 20 measures the force between the measuring assembly 20 and the tensioning assembly 30 during the movement.

[0058] In this embodiment, the workbench assembly 10 serves as the basic support platform for the entire device, used to fix and adjust the position of the gas fuel injector 40 under test. The measuring assembly 20 provides displacement control and force measurement, forming a force-displacement curve for calculating the spring preload and the remaining air gap of the gas fuel injector 40 under test. The tensioning assembly 30 is connected to the armature hole 451 of the gas fuel injector 40 under test, ensuring that the armature and the measuring assembly move synchronously under the drive of the measuring assembly 20, facilitating direct force measurement. When the tensioning assembly 30 is in a deformed state and tightly fitted with the armature, the measuring assembly 20 is activated, driving the tensioning assembly 30 and the armature to move upward, while simultaneously recording the force between the measuring assembly 20 and the tensioning assembly 30 during the movement.

[0059] Combination Figure 5As shown, theoretically, S1 and S2 are a vertical straight line, reaching the force instantaneously. However, due to the rigidity of the testing system, this line becomes a steep upward line, which represents the system stiffness. As the probe 24 continues to rise, it compresses the spring 44, gradually increasing the force, conforming to Hooke's law regarding the deformation of the spring 44. That is, the slope from S2 to S3 represents the stiffness of the spring 44. When the rising height reaches the gap height, i.e., when the armature 45 and the iron core 41 contact, another abrupt change point S3 is reached. Upon further ascent, the force becomes the intermetallic deformation stress, and the inclination of the straight line gradually increases until the predetermined test force (generally 2-3 times the preload of the spring 44) is reached. At this point, the test stops, and the probe 24 returns to its initial position. This completes the testing process. According to the force-displacement curve, the position S2 corresponding to the first inflection point is the point where the spring begins to be compressed. The spring preload can be calculated directly from this, i.e., F_preload = F(S2). The position S3 of the second inflection point is the point where the armature and the iron core are in complete contact. The remaining air gap δ can be obtained by the difference between S3 and S1, i.e., δ = S3 - S1.

[0060] Furthermore, the measuring component 20 includes a telescopic sub-component 21, a connecting seat 22, a sensor 23, and a probe 24. Part of the telescopic sub-component 21 is connected to the worktable component 10, and another part of the telescopic sub-component 21 is connected to another part of the telescopic sub-component 21. The other part of the telescopic sub-component 21 is movably disposed relative to the part of the telescopic sub-component 21. The connecting seat 22 is connected to the other part of the telescopic sub-component 21. The sensor 23 is connected to the connecting seat 22. The probe 24 is connected to the tensioning component 30 and the sensor 23. When the tensioning component 30 is in a deformed state, part of the telescopic sub-component 21 drives the other part of the telescopic sub-component 21, the connecting seat 22, the sensor 23, the probe 24, and the tensioning component 30 to move away from the gas fuel injector 40 to be tested. The sensor 23 measures the force between the probe 24 and the tensioning component 30 during the movement.

[0061] When one part of the telescopic subassembly 21 is in a fixed state and connected to the worktable assembly 10, the other part of the telescopic subassembly 21 forms a telescopic connection with the fixed part through a lead screw and nut mechanism. The telescopic movement is controlled by a stepper motor or other drive device, which can achieve displacement control accuracy at the 0.001mm level, ensuring high measurement accuracy.

[0062] During the measurement process, when the tensioning assembly 30 is placed inside the armature hole 451 and is in a deformed state, the moving part of the telescopic sub-assembly 21 begins to move. As the telescopic sub-assembly 21 drives the connecting seat 22, sensor 23, and probe 24 to move upward, the probe 24 contacts the tensioning assembly 30 in the deformed state, and the tensioning assembly 30 moves together with it. During this process, the sensor 23 monitors and records the force changes generated between the probe 24 and the tensioning assembly 30 in real time. These data will be used to generate a force-displacement curve, from which the specific values ​​of the spring preload and remaining air gap can be obtained through analysis.

[0063] Further, the telescopic sub-assembly 21 includes a lead screw 211, a lead screw seat 212, and a drive unit 213. The lead screw 211 is connected to the lead screw seat 212, and the lead screw seat 212 is connected to the connecting seat 22. The lead screw seat 212 is movably disposed relative to the lead screw 211 along the axial direction of the lead screw 211. The output end of the drive unit 213 is connected to the lead screw 211, and the drive unit 213 is connected to the worktable assembly 10. When the tensioning assembly 30 is in a deformed state, the drive unit 213 drives the lead screw 211 to rotate, so that the lead screw seat 212, the connecting seat 22, the sensor 23, the probe 24, and the tensioning assembly 30 move away from the gas fuel injector 40 to be tested along the axial direction of the lead screw 211. The sensor 23 measures the force between the probe 24 and the tensioning assembly 30 during the movement.

[0064] Combination Figures 1 to 3 As shown, the measurement process can begin when the measuring component 20 is ready and the tensioning component 30 is inserted into the armature hole 451 of the gas fuel injector 40 under test and is in a deformed state, ensuring good contact and synchronous movement with the armature 45. At this time, after receiving the start signal, the drive unit 213 (such as a stepper motor) drives the lead screw 211 to rotate. The rotation of the lead screw 211 is converted into linear motion along the lead screw axis through the threaded engagement with the lead screw seat 212, thereby driving the lead screw seat 212, connecting seat 22, sensor 23, probe 24 and tensioning component 30 to move upward as a whole. During the movement, the sensor 23 monitors the force between the probe 24 and the tensioning component 30 in real time. As the entire device is displaced, the force will change, gradually increasing from an initial small value until it reaches its maximum value when the armature 45 contacts the iron core 41. Sensor 23 converts the monitored force changes and the displacement data of lead screw seat 212 into electrical signals and records them to form a force-displacement curve.

[0065] In one optional embodiment of this application, the telescopic sub-assembly 21 includes a motor, a gear, and a rack. The motor is connected to the worktable assembly 10; the output end of the motor is connected to the gear; the rack is connected to the connecting seat 22, and the rack and gear are meshed together. When the tensioning assembly 30 is in a deformed state, the motor drives the gear to rotate, so that the rack drives the connecting seat 22, the sensor 23, the probe 24, and the tensioning assembly 30 to move away from the gas fuel injector 40 to be tested along the height direction of the worktable assembly 10. The sensor 23 measures the force between the probe 24 and the tensioning assembly 30 during the movement.

[0066] In this embodiment, a rack and pinion transmission system is used to control the vertical displacement of the measuring component 20. Working in conjunction with the tensioning component 30, it accurately measures the remaining air gap and spring preload of the gas fuel injector 40 under test. Its direct, efficient, and automated characteristics help improve measurement accuracy and consistency, providing a powerful tool for injector performance optimization and quality control. Furthermore, compared to screw drives, this mechanical transmission method offers higher load-bearing capacity and faster response speed in certain situations, meeting the needs of different measurement conditions. Through the above design, the measuring device of this invention can directly and accurately measure the remaining air gap and spring preload of the gas fuel injector, improving measurement accuracy and efficiency, and ensuring the performance consistency of the injector.

[0067] Furthermore, the probe 24 includes a probe body 240 and a mounting groove 241. The probe body 240 is connected to the sensor 23, and the mounting groove 241 is connected to the tensioning assembly 30.

[0068] Combination Figure 4 As shown, the probe body 240, through its connection with the sensor 23, directly transmits the force value from the tensioning assembly 30 to the sensor 23, which converts it into an electrical signal for recording. During the measurement process, the probe body 240 moves with the telescopic sub-assembly 21 (whether it is a lead screw type or a rack and pinion type), and the mounting groove 241 ensures that the tensioning assembly 30 can stably follow the movement of the probe body 240, thereby accurately controlling the relative displacement between the two and forming a reliable force-displacement curve.

[0069] In one specific embodiment of this application, the mounting groove 241 can be configured as a T-groove. The cross-section of the T-groove is typically T-shaped, consisting of a straight groove and a vertical groove. This design facilitates the insertion of the top structure of the tensioning assembly 30 (such as a nut or other connector), and restricts its movement along the axis perpendicular to the connector through the vertical groove, ensuring the stability and positioning accuracy of the tensioning assembly 30 in the direction perpendicular to its axis. This configuration enhances the stability of the connection with the tensioning assembly 30.

[0070] Furthermore, the tensioning assembly 30 includes a connecting rod 31, a clamping block 32, a deformable block 33, and a connecting block 34. The connecting rod 31 is connected to the probe 24. The clamping block 32 is arranged circumferentially along the connecting rod 31. The deformable block 33 is arranged circumferentially along the connecting rod 31 and is located on the side of the connecting rod 31 away from the probe 24. The deformable block 33 has an initial state and a deformed state. The connecting block 34 is arranged circumferentially along the connecting rod 31 and is located on the side of the connecting rod 31 away from the probe 24. The clamping block 32 is located between the connecting block 34 and the deformable block 33. When the tensioning assembly 30 is located in the armature hole 451 of the gas fuel injector 40 to be tested, the connecting block 34 is moved along the connecting rod 31 to the side away from the probe 24, thereby driving the clamping block 32 to move along the connecting rod 31 towards the deformable block 33, so that the deformable block 33 is in a deformed state.

[0071] In this embodiment, when the tensioning assembly 30 is inserted into the armature center hole 451 of the gas fuel injector 40 under test, the deformable block 33 is in its initial state. Subsequently, by operating the connecting block 34 to move along the connecting rod 31 towards the deformable block 33, this action indirectly pushes the clamping block 32 to move towards the deformable block 33, thereby applying pressure to the deformable block 33. As the pressure increases, the deformable block 33 begins to expand radially until it forms an interference fit with the inner wall of the armature center hole 451, ensuring effective contact between the tensioning assembly 30 and the internal structure of the gas fuel injector 40 under test. At this time, the entire measurement system (including the probe 24, sensor 23, and tensioning assembly 30) becomes a single unit, which can be vertically displaced by the drive of the telescopic sub-assembly 21. The sensor 23 records the change in the force between the probe 24 and the deformable block 33 during the measurement process, thereby forming a force-displacement curve for analyzing the spring preload and remaining air gap.

[0072] Knot Figure 4 As shown in a specific embodiment of this application, the tensioning assembly 30 includes a connecting rod 31, a clamping block 32, a deformable block 33, a connecting block 34, and a nut 35. The connecting rod 31 is a threaded rod, and the connecting block 34 is a nut. When the tensioning assembly 30 is connected to the probe body 240, the nut 35 is connected to the end of the connecting rod 31 near the probe body 240, and the nut 35 is located within the mounting groove 241. Working in conjunction with the mounting groove 241, the nut 35 restricts the lateral displacement of the connecting rod 31, the clamping block 32, and the deformable block 33 in a direction perpendicular to the axial direction of the connecting rod 31. During measurement, the nut 35 cooperates with the mounting groove 241 to limit the lateral displacement of the connecting rod 31, ensuring that the tensioning assembly 30 can rise stably along the axial direction of the gas fuel injector 40 under test. Simultaneously, the sensor 23 records the change in the force between the probe 24 and the deformable block 33, forming a force-displacement curve from which the measured values ​​of the spring preload and the remaining air gap are extracted.

[0073] In one specific embodiment of this application, the deformable block 33 may be made of copper, nylon or engineering plastic to achieve an interference fit between the tensioning component 30 and the gas fuel injector 40 to be tested, thereby improving measurement accuracy.

[0074] Furthermore, the workbench assembly 10 includes a base 11, a chuck 12, and a bracket 13. The chuck 12 is connected to the base 11 and is movably disposed relative to the base 11. The chuck 12 is used to connect the gas fuel injector 40 to be tested. The bracket 13 is connected to the base 11 and is connected to the telescopic sub-assembly 21.

[0075] Before measurement, the operator adjusts the position of the chuck 12 according to the dimensions of the gas fuel injector 40 to be measured, using the T-slot on the base 11, to ensure it is in the optimal measurement position. The chuck 12 securely holds the injector in place via its internal jaws, ensuring that the injector will not move during measurement and affect measurement accuracy. The bracket 13 provides stable and adjustable support for the telescopic sub-assembly 21, ensuring that the sensor 23 and probe 24 can vertically and smoothly contact the armature center hole 451 of the gas fuel injector 40 to measure force and displacement. The adjustability of the bracket 13 allows the telescopic sub-assembly to adapt to injectors of different heights, enhancing the versatility of the measuring device.

[0076] Through this design of the workbench assembly 10, the measuring device of the present invention can more accurately and efficiently measure the remaining air gap and spring preload of the gas fuel injector 40 under test. The mobility of the chuck 12, combined with the support and adjustment function of the bracket 13, not only enhances the adaptability and versatility of the measuring device, but also improves the stability during the measurement process, ensuring the accuracy and reliability of the measurement results.

[0077] Furthermore, the workbench assembly 10 includes a slider 14 and a back plate 15. The slider 14 is connected to the support 13 and is movably arranged along the height direction of the support 13. The back plate 15 is connected to the slider 14, the back plate 15 is connected to the telescopic sub-assembly 21, and the back plate 15 is movably connected to the connecting seat 22.

[0078] During the measurement preparation phase, the operator can adjust the initial position of the telescopic sub-assembly 21 by moving the slider 14 along the height direction of the bracket 13, so that it is precisely aligned with the armature center hole 451 of the gas fuel injector 40 to be measured. This mobility of the slider 14 ensures that the measuring device can be accurately aligned regardless of the installation height of the injector, providing an optimal starting point for the measurement process. The back plate 15 is connected to the telescopic sub-assembly 21, and the connecting seat 22 is movably set relative to the back plate 15 so that the telescopic sub-assembly 21 can drive the connecting seat 22 to move relative to the back plate 15.

[0079] Furthermore, the back plate 15 includes a first component section 151, a second component section 152, and a guide rail 153. The first component section 151 is connected to the slider 14; the guide rail 153 is connected to the first component section 151, and the length direction of the guide rail 153 is set along the height direction of the bracket 13. The guide rail 153 is configured to cooperate with the connecting seat 22; the second component section 152 is connected to the first component section 151 and is connected to the telescopic sub-assembly 21.

[0080] Combination Figure 1 As shown, in this embodiment, the back plate 15 is connected to the slider 14 via the first component section 151 so that the slider 14 can move along the height direction of the bracket 13. The second component section 152 is used to connect the first component section 151 and the telescopic sub-assembly 21. It not only strengthens the structural integrity of the back plate 15, but also provides additional support and guidance for the telescopic sub-assembly 21, ensuring the stability of the measuring component 20 when performing the measuring task. The guide rail 153 provides guidance for the movement of the connecting seat 22, ensuring that the telescopic sub-assembly 21 can move stably along the height direction of the bracket 13.

[0081] Furthermore, the base 11 is provided with a slide groove 111, and the worktable assembly 10 includes a connecting plate 16. The chuck 12 is connected to the base 11 through the connecting plate 16, and the connecting plate 16 is configured to cooperate with the slide groove 111.

[0082] During the measurement preparation phase, the operator can manually adjust the position of the connecting plate 16 on the slide rail 111, or with the aid of external tools such as the handwheel on the sliding guide rail. This will cause the chuck 12 and the gas fuel injector 40 to be measured to move horizontally until the optimal measurement position is found. Once the position is determined, the operator can use a fastening device to fix the connecting plate 16 to a certain position on the slide rail 111, ensuring the stability of the position of the gas fuel injector 40 to be measured during the measurement process.

[0083] Combination Figure 1 and Figure 3 As shown, the workbench assembly 10 includes a base 11, a chuck 12, a support 13, a slider 14, and a back plate 15. The base 11 is provided with a slide groove 111. Specifically, the slide groove 111 is a T-slot, and the chuck 12 is a three-jaw chuck. The position of the chuck 12 can be adjusted through the slide groove 111 and the connecting plate 16 to accommodate different types of injectors. The support 13 includes a crossbeam, a stud, and a column. The crossbeam is connected to the stud, and the crossbeam is connected to the column. The slider 14 is movably connected to at least one of the stud and the column. The slider 14 is an I-beam slider.

[0084] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0085] 1) The workbench assembly 10 serves as the basic support platform for the entire device, used to fix and adjust the position of the gas fuel injector 40 under test. The measuring assembly 20 provides displacement control and force measurement, forming a force-displacement curve for calculating the spring preload and the remaining air gap of the gas fuel injector 40 under test. The tensioning assembly 30 is connected to the armature center hole 451 of the gas fuel injector 40 under test. Driven by the measuring assembly 20, it ensures that the armature and the measuring assembly move synchronously, facilitating direct force measurement. When the tensioning assembly 30 is in a deformed state and tightly fitted with the armature, the measuring assembly 20 is activated, driving the tensioning assembly 30 and the armature to move upward, while simultaneously recording the force between the measuring assembly 20 and the tensioning assembly 30 during the movement.

[0086] 2) The telescopic movement of the telescopic subassembly 21 is controlled by a stepper motor, which can achieve displacement control accuracy at the level of 0.001mm, ensuring high measurement accuracy.

[0087] 3) When the measuring component 20 is ready and the tensioning component 30 is inserted into the armature hole 451 of the gas fuel injector 40 under test and is in a deformed state, ensuring good contact and synchronous movement with the armature 45, the measurement process can begin. At this time, after receiving the start signal, the drive unit 213 (such as a stepper motor) drives the lead screw 211 to rotate. The rotation of the lead screw 211, through the threaded engagement with the lead screw seat 212, converts the rotational motion into linear motion along the lead screw axis, thereby driving the lead screw seat 212, connecting seat 22, sensor 23, probe 24, and tensioning component 30 to move upward as a whole. During the movement, the sensor 23 monitors the force between the probe 24 and the tensioning component 30 in real time. As the entire device is displaced, the force will change, gradually increasing from an initial small value until it reaches its maximum value when the armature 45 contacts the iron core 41. Sensor 23 converts the monitored force changes and the displacement data of lead screw seat 212 into electrical signals and records them to form a force-displacement curve.

[0088] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0089] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A measuring device for a gas fuel injector, characterized in that, include: A workbench assembly (10) is used to connect to a gas fuel injector (40) to be tested. Measurement component (20), part of the measurement component (20) is connected to the worktable assembly (10), and another part of the measurement component (20) is movably disposed relative to the part of the measurement component (20); Tensioning assembly (30), which is detachably connected to the measuring assembly (20), has an original initial state and a deformed state that produces deformation, and is used to connect to the armature hole (451) of the gas fuel injector (40) to be tested; When the tensioning component (30) is in the deformed state, the measuring component (20) drives the tensioning component (30) to move away from the gas fuel injector (40) to be tested, and the measuring component (20) measures the force between the measuring component (20) and the tensioning component (30) during the movement. The measurement component (20) includes: Telescopic sub-assembly (21), a portion of the telescopic sub-assembly (21) is connected to the worktable assembly (10), a portion of the telescopic sub-assembly (21) is connected to another portion of the telescopic sub-assembly (21), and the other portion of the telescopic sub-assembly (21) is movably disposed relative to the portion of the telescopic sub-assembly (21); Connecting seat (22), which is connected to another part of the telescopic sub-assembly (21); Sensor (23), which is connected to the connector (22); The probe (24) is connected to the tensioning assembly (30) and the sensor (23); When the tensioning component (30) is in the deformed state, part of the telescopic sub-component (21) drives another part of the telescopic sub-component (21), the connecting seat (22), the sensor (23), the probe (24) and the tensioning component (30) to move away from the gas fuel injector (40) to be tested. The sensor (23) measures the force between the probe (24) and the tensioning component (30) during the movement.

2. The measuring device for a gas fuel injector according to claim 1, characterized in that, The telescopic sub-component (21) includes: Lead screw (211); A lead screw seat (212) is provided, wherein the lead screw (211) is connected to the lead screw seat (212), and the lead screw seat (212) is connected to the connecting seat (22). The lead screw seat (212) is movably disposed relative to the lead screw (211) along the axial direction of the lead screw (211). The drive unit (213) is connected to the lead screw (211) at its output end and to the worktable assembly (10). When the tensioning assembly (30) is in the deformed state, the driving unit (213) drives the lead screw (211) to rotate, so that the lead screw seat (212), the connecting seat (22), the sensor (23), the probe (24) and the tensioning assembly (30) move away from the gas fuel injector (40) to be tested along the axial direction of the lead screw (211), and the sensor (23) measures the force between the probe (24) and the tensioning assembly (30) during the movement.

3. The measuring device for a gas fuel injector according to claim 1, characterized in that, The telescopic sub-component (21) includes: An electric motor, which is connected to the worktable assembly (10); A gear, the output end of the motor is connected to the gear; A rack, which is connected to the connecting seat (22), and is configured to mesh with the gear; When the tensioning assembly (30) is in the deformed state, the motor drives the gear to rotate so that the rack drives the connecting seat (22), the sensor (23), the probe (24) and the tensioning assembly (30) to move away from the gas fuel injector (40) under test along the height direction of the workbench assembly (10). The sensor (23) measures the force between the probe (24) and the tensioning assembly (30) during the movement.

4. The measuring device for a gas fuel injector according to any one of claims 1 to 3, characterized in that, The probe (24) includes: The probe body (240) is connected to the sensor (23); Mounting slot (241), which is connected to the tensioning assembly (30).

5. The measuring device for a gas fuel injector according to claim 4, characterized in that, The tensioning component (30) includes: Connecting rod (31), the connecting rod (31) is connected to the probe (24); A clamping block (32) is arranged circumferentially along the connecting rod (31); Deformation block (33), the deformation block (33) is arranged along the circumference of the connecting rod (31), the deformation block (33) is arranged on the side of the connecting rod (31) away from the probe (24), the deformation block (33) has the initial state and the deformed state; A connecting block (34) is arranged circumferentially along the connecting rod (31). The connecting block (34) is located on the side of the connecting rod (31) near the probe (24). The clamping block (32) is located between the connecting block (34) and the deformable block (33). When the tensioning assembly (30) is located in the armature hole (451) of the gas fuel injector (40) to be tested, the connecting block (34) is operated to move along the connecting rod (31) to the side away from the probe (24), thereby driving the clamping block (32) to move along the connecting rod (31) towards the deformable block (33) so that the deformable block (33) is in the deformed state.

6. The measuring device for a gas fuel injector according to any one of claims 1-3 and 5, characterized in that, The workbench assembly (10) includes: Base (11); A chuck (12) is connected to the base (11). The chuck (12) is movably disposed relative to the base (11). The chuck (12) is used to connect the gas fuel injector (40) to be tested. The bracket (13) is connected to the base (11) and the bracket (13) is connected to the telescopic sub-assembly (21).

7. The measuring device for a gas fuel injector according to claim 6, characterized in that, The workbench assembly (10) includes: A slider (14) is connected to the bracket (13) and is movably disposed along the height direction of the bracket (13); The back plate (15) is connected to the slider (14), the back plate (15) is connected to the telescopic sub-assembly (21), and the back plate (15) is movably connected to the connecting seat (22).

8. The measuring device for a gas fuel injector according to claim 7, characterized in that, The backplate (15) includes: The first component segment (151) is connected to the slider (14); The guide rail (153) is connected to the first component section (151). The length direction of the guide rail (153) is set along the height direction of the bracket (13). The guide rail (153) is configured to cooperate with the connecting seat (22). The second component segment (152) is connected to the first component segment (151) and is connected to the telescopic sub-assembly (21).

9. The measuring device for a gas fuel injector according to claim 7 or 8, characterized in that, The base (11) is provided with a slide groove (111), and the workbench assembly (10) includes: The connecting plate (16) is used to connect the chuck (12) to the base (11). The connecting plate (16) is configured to cooperate with the slide (111).

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