Measuring device for gaseous fuel injector

Abstract

The invention provides a measuring device for a gas fuel injector, and relates to the technical field of gas fuel injector measurement, and the measuring device comprises a workbench assembly which is used for connecting a to-be-measured fuel injector; a part of the measuring assemblies are connected with the workbench assembly, and the other part of the measuring assemblies are movably arranged relative to the part of the measuring assemblies; the tensioning assembly is detachably connected with the measuring assembly, the tensioning assembly has an original initial state and a deformation state for generating deformation, and the tensioning assembly is used for being connected with an armature center hole of the fuel injector to be measured; when the tensioning assembly is in the deformation state, the measuring assembly drives the tensioning assembly to move away from the fuel injector to be measured, the measuring assembly measures the force borne between the measuring assembly and the tensioning assembly in the moving process, and the problem that in the prior art, the measuring precision of the residual air gap of the gas fuel injector and the spring pre-tightening force is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas fuel injector measurement, and in particular to a measuring device for a gas fuel injector. Background Art

[0002] Gas fuels are finding increasing application in automotive and marine engines. Gas injectors are a key component of new energy engine fuel supply systems, significantly impacting engine performance and emissions. Gas injectors precisely control the residual air gap and spring preload of the electromagnet to achieve precise control of the gas channel's opening and closing, dynamic response, and, consequently, precise control of the injection volume. Therefore, precise measurement and adjustment of the residual air gap and spring preload are essential during the design and development of gas injectors.

[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 are unable to directly measure these two parameters, which affects the performance consistency and reliability of gas injectors.

[0004] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0005] The main purpose of the present invention is to provide a measuring device for a gas fuel injector to solve the problem of low measurement accuracy of residual air gap and spring preload force of gas fuel injectors in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a measuring device for a gas fuel injector, comprising: a workbench assembly, the workbench assembly being used to connect to the fuel injector to be tested; a measuring assembly, a portion of the measuring assembly being connected to the workbench assembly, and another portion of the measuring assembly being movably arranged relative to the portion of the measuring assembly; a tensioning assembly, the tensioning assembly being detachably connected to the measuring assembly, the tensioning assembly having an original initial state, and the tensioning assembly having a deformed state in which deformation is generated, the tensioning assembly being used to connect to the armature center hole 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 applied between the measuring assembly and the tensioning assembly during the movement.

[0007] Furthermore, the measuring assembly includes: a telescopic subassembly, part of which is connected to the workbench assembly, part of which is connected to the telescopic subassembly of another part, and the telescopic subassembly of another part is movably arranged relative to the telescopic subassembly of the part; a connecting seat, which is connected to the telescopic subassembly of another part; a sensor, which is connected to the connecting seat; a probe, which is connected to the tensioning assembly, and the probe is connected to the sensor; wherein, when the tensioning assembly is in a deformed state, part of the telescopic subassembly drives the telescopic subassembly of another part, the connecting seat, the sensor, the probe and the tensioning assembly to move away from the fuel injector to be measured, and the sensor measures the force applied between the probe and the tensioning assembly during the movement.

[0008] Furthermore, the telescopic subassembly includes: a screw; a screw seat, the screw is connected to the screw seat, the screw seat is connected to the connecting seat, and the screw seat is movably arranged relative to the screw along the axial direction of the screw; a driving part, the output end of the driving part is connected to the screw, and the driving part is connected to the workbench assembly; wherein, when the tensioning assembly is in a deformed state, the driving part drives the screw to rotate so that the screw seat connecting seat, the sensor, the probe and the tensioning assembly move away from the fuel injector to be tested along the axial direction of the screw, and the sensor measures the force between the probe and the tensioning assembly during the movement.

[0009] Furthermore, the telescopic subassembly includes: a motor, which is connected to the workbench assembly; a gear, the output end of the motor is connected to the gear; a rack, which is connected to the connecting seat, and the rack and the gear are arranged in meshing engagement; wherein, when the tensioning assembly is in a deformed state, the motor drives the gear to rotate, so that the rack drives the connecting seat, the sensor, the probe and the tensioning assembly to move away from the fuel injector to be tested along the height direction of the workbench assembly, and the sensor measures the force between the probe and the tensioning assembly during the movement.

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

[0011] Furthermore, the tensioning assembly includes: a connecting rod, which is connected to the probe; a clamping block, which is arranged along the circumference of the connecting rod; a deformation block, which is arranged along the circumference of the connecting rod, and is arranged on the side of the connecting rod away from the probe, and the deformation block has an initial state and a deformation state; a connecting block, which is arranged along the circumference of the connecting rod, and is arranged on the side of the connecting rod away from the probe, and the clamping block is arranged between the connecting block and the deformation block; wherein, when the tensioning assembly is located in the armature hole of the fuel injector to be tested, the connecting block is operated to move along the connecting rod toward the side away from the probe, thereby driving the clamping block to move along the connecting rod toward the deformation block, so that the deformation block is in a deformed state.

[0012] Furthermore, the workbench assembly includes: a base; a chuck connected to the base, movably arranged relative to the base, and used to connect to the fuel injector to be tested; a bracket connected to the base, and connected to the telescopic subassembly.

[0013] Furthermore, the workbench assembly includes: a slider, which is connected to the bracket and is movably arranged along the height direction of the bracket; a backboard, which is connected to the slider, the backboard is connected to the telescopic subassembly, and the backboard is movably connected to the connecting seat.

[0014] Furthermore, the back panel includes: a first component segment, the first component segment is connected to the slider; a guide rail, the guide rail is connected to the first component segment, the length direction of the guide rail is arranged along the height direction of the bracket, and the guide rail is arranged in coordination with the connecting seat; a second component segment, the second component segment is connected to the first component segment, and the second component segment is connected to the telescopic sub-assembly.

[0015] Furthermore, the base is provided with a slide groove, and the workbench assembly includes: a connecting plate, the chuck is connected to the base via the connecting plate, and the connecting plate is provided in coordination with the slide groove.

[0016] By applying the technical solution of the present invention, when the tensioning assembly is in a deformed state and fits tightly with the armature, the measuring assembly is activated, driving the tensioning assembly and the armature to move upward, while recording the force exerted between the measuring assembly and the tensioning assembly during the movement. Based on the force-displacement curve, the spring preload and the residual air gap of the fuel injector to be measured are calculated, thereby solving the problem of low accuracy in measuring the residual air gap and spring preload of gas fuel injectors in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 A schematic structural 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 structural diagram of an embodiment of a gas fuel injector according to the present invention is shown;

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

[0022] Figure 5FIG. 1 is a schematic diagram showing a force-displacement curve measured by a measuring device for a gas fuel injector according to the present invention.

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

[0024] 10. Workbench assembly;

[0025] 11. Base; 111. Slide;

[0026] 12. Chuck;

[0027] 13. Bracket;

[0028] 14. Slider;

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

[0030] 16. Connecting plate;

[0031] 20. Measurement components;

[0032] 21. Telescopic subcomponent;

[0033] 211, screw;

[0034] 212, screw seat;

[0035] 213, driving unit;

[0036] 22. Connecting seat;

[0037] 23. Sensor;

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

[0039] 30. Tensioning assembly;

[0040] 31. Connecting rod;

[0041] 32. Compression block;

[0042] 33. Deformed block;

[0043] 34. Connecting block;

[0044] 35. Nut;

[0045] 40. Fuel injector under test;

[0046] 41. Iron core;

[0047] 42. Injector upper shell;

[0048] 43. Coil;

[0049] 44. Spring;

[0050] 45. Armature; 451. Armature center hole; 452. Armature air outlet. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0055] Figure 2This is a structural diagram of an embodiment of a gas fuel injector. The gas fuel injector 40 to be tested 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 center hole 451 and an armature air outlet 452. The armature air outlet 452 is arranged in communication with the armature center hole 451. The iron core 41, the coil 43 and the armature 45 are arranged in sequence in the injector upper shell 42. The iron core 41 and the upper side of the armature 45 are connected by a spring 44.

[0056] Combine 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 the gas fuel injector includes a workbench assembly 10, a measuring assembly 20 and a tensioning assembly 30, the workbench assembly 10 is used to connect the gas fuel injector 40 to be tested; part of the measuring assembly 20 is connected to the workbench assembly 10, and the other part of the measuring assembly 20 is movably arranged 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 original initial state, and the tensioning assembly 30 has a deformation state in which deformation occurs, and the tensioning assembly 30 is used to connect to the armature center hole 451 of the gas fuel injector 40 to be tested; wherein, when the tensioning assembly 30 is in the deformation 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 applied between the measuring assembly 20 and the tensioning assembly 30 during the movement.

[0058] In this embodiment, the workbench assembly 10 serves as the base support platform for the entire apparatus, used to secure and adjust the position of the gas fuel injector 40 under test. The measuring assembly 20 is used to provide displacement control and force measurement, generating a force-displacement curve for calculating the spring preload and the residual air gap of the gas fuel injector 40 under test. The tensioning assembly 30 is connected to the armature bore 451 of the gas fuel injector 40 under test. Driven by the measuring assembly 20, the armature and the measuring assembly move synchronously, facilitating direct force measurement. When the tensioning assembly 30 is deformed and tightly fitted to the armature, the measuring assembly 20 activates, driving the tensioning assembly 30 and the armature upward, while simultaneously recording the force exerted between the measuring assembly 20 and the tensioning assembly 30 during this movement.

[0059] Combine Figure 5As shown, theoretically S1 and S2 are a vertical straight line, and the force is reached instantly. However, due to the presence of a certain stiffness in the test system, this line is an ascending line with a very high slope, and this slope is the stiffness of the system. The probe 24 continues to rise, compressing the spring 44, and the force gradually increases, which conforms to Hooke's law of deformation force of the spring 44, that is, the slope from S2 to S3 is the stiffness of the spring 44. When the rising height reaches the gap height, that is, when the armature 45 and the iron core 41 are in contact, it reaches another mutation point S3. At this time, it continues to rise, and the force is the deformation stress between the metals. The inclination of the straight line gradually increases until the limited test force (generally 2-3 times the preload force of the spring 44) is reached. The test is stopped and the probe 24 returns to the initial position. This is the complete process of the test. According to the force-displacement curve, the position S2 corresponding to the first inflection point calculated represents the point where the spring begins to be compressed, from which the spring preload force can be directly calculated, that is, Fpre = F(S2); the second inflection point position S3 represents the point where the armature and the iron core are in full contact. The residual air gap δ can be obtained by the difference between S3 and S1, that is, δ = S3-S1.

[0060] Furthermore, the measuring assembly 20 includes a telescopic subassembly 21, a connecting seat 22, a sensor 23 and a probe 24, wherein part of the telescopic subassembly 21 is connected to the workbench assembly 10, part of the telescopic subassembly 21 is connected to another part of the telescopic subassembly 21, and another part of the telescopic subassembly 21 is movably arranged relative to part of the telescopic subassembly 21; the connecting seat 22 is connected to another part of the telescopic subassembly 21; the sensor 23 is connected to the connecting seat 22; the probe 24 is connected to the tensioning assembly 30, and the probe 24 is connected to the sensor 23; wherein, when the tensioning assembly 30 is in a deformed state, part of the telescopic subassembly 21 drives the other part of the telescopic subassembly 21, 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, and the sensor 23 measures the force between the probe 24 and the tensioning assembly 30 during the movement.

[0061] While one portion of the telescopic subassembly 21 is fixed and connected to the worktable assembly 10, the other portion of the telescopic subassembly 21 forms a telescopic connection to the fixed portion via a screw-nut mechanism. This telescopic movement is controlled by a drive device such as a stepper motor, achieving displacement control accuracy of 0.001mm, ensuring high-precision measurements.

[0062] During measurement, when the tensioning assembly 30 is placed within the armature bore 451 and deformed, the active portion of the telescopic subassembly 21 begins to move. As the telescopic subassembly 21 drives the connecting base 22, sensor 23, and probe 24 upward, the probe 24 contacts the deformed tensioning assembly 30, causing the active tensioning assembly 30 to move with it. During this process, the sensor 23 monitors and records the force changes between the probe 24 and the tensioning assembly 30 in real time. This data is used to generate a force-displacement curve, from which the specific values of the spring preload and residual air gap can be analyzed.

[0063] Furthermore, the telescopic subassembly 21 includes a screw rod 211, a screw rod seat 212 and a driving part 213. The screw rod 211 is connected to the screw rod seat 212, the screw rod seat 212 is connected to the connecting seat 22, and the screw rod seat 212 is movably arranged relative to the screw rod 211 along the axial direction of the screw rod 211; the output end of the driving part 213 is connected to the screw rod 211, and the driving part 213 is connected to the workbench assembly 10; wherein, when the tensioning assembly 30 is in a deformed state, the driving part 213 drives the screw rod 211 to rotate, so that the screw rod seat 212 connecting seat 22, the sensor 23, the probe 24 and the tensioning assembly 30 move along the axial direction of the screw rod 211 away from the gas fuel injector 40 to be tested, and the sensor 23 measures the force between the probe 24 and the tensioning assembly 30 during the movement.

[0064] Combine Figures 1 to 3 As shown, when the measurement assembly 20 is ready and the tensioning assembly 30 has been inserted into the armature bore 451 of the gas fuel injector 40 to be tested and is in a deformed state, ensuring good contact and synchronous movement with the armature 45, the measurement process can begin. At this point, upon receiving a start signal, the drive unit 213 (e.g., a stepper motor) drives the screw 211 to rotate. The rotation of the screw 211, through threaded engagement with the screw seat 212, converts the rotational motion into linear motion along the screw axis, thereby driving the screw seat 212, the connecting seat 22, the sensor 23, the probe 24, and the tensioning assembly 30 to move upward as a whole. During this movement, the sensor 23 monitors the force between the probe 24 and the tensioning assembly 30 in real time. As the entire device moves, the force changes, gradually increasing from an initial low value until it reaches a maximum value when the armature 45 contacts the core 41. The sensor 23 converts the monitored force value changes and the displacement data of the screw seat 212 into electrical signals and records them to form a force-displacement curve.

[0065] In an optional embodiment of the present application, the telescopic subassembly 21 includes a motor, a gear and a rack, the motor is connected to the workbench 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 the gear are arranged in meshing engagement; wherein, 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 along the height direction of the workbench assembly 10 away from the gas fuel injector 40 to be tested, and 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 achieve vertical displacement control of the measuring assembly 20. Working in conjunction with the tensioning assembly 30, it can accurately measure the residual air gap and spring preload of the gas fuel injector 40 to be tested. Its direct, efficient, and automated characteristics help improve the accuracy and consistency of measurement, providing a powerful tool for injector performance optimization and quality control. In addition, compared to screw drive, this mechanical transmission method has a higher load capacity and faster response speed in some cases, meeting the needs of different measurement conditions. Through the above design, the measuring device of the present invention can directly and accurately measure the residual air gap and spring preload of the gas fuel injector, improving the accuracy and efficiency of the measurement, which is crucial for ensuring the performance consistency of the injector.

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

[0068] Combine Figure 4 As shown, the probe body 240, through its connection to the sensor 23, transmits the force transmitted from the tensioning assembly 30 directly to the sensor 23, which converts it into an electrical signal for recording. During measurement, the probe body 240 moves with the movement of the telescopic subassembly 21 (whether a screw-type or rack-and-pinion type). The mounting slot 241 ensures that the tensioning assembly 30 stably follows the movement of the probe body 240, thereby precisely controlling the relative displacement between the two and generating a reliable force-displacement curve.

[0069] In a specific embodiment of the present application, the mounting groove 241 can be configured as a T-slot. The cross section of the T-slot is generally T-shaped and consists 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 in a direction perpendicular to the axis of the connector by the vertical groove, thereby ensuring the stability and positioning accuracy of the tensioning assembly 30 in a direction perpendicular to the axis of the tensioning assembly 30. 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 deformation block 33 and a connecting block 34, the connecting rod 31 is connected to the probe 24; the clamping block 32 is arranged along the circumference of the connecting rod 31; the deformation block 33 is arranged along the circumference of the connecting rod 31, and the deformation block 33 is arranged on the side of the connecting rod 31 away from the probe 24, and the deformation block 33 has an initial state and a deformation state; the connecting block 34 is arranged along the circumference of the connecting rod 31, and the connecting block 34 is arranged on the side of the connecting rod 31 away from the probe 24, and the clamping block 32 is arranged between the connecting block 34 and the deformation block 33; wherein, when the tensioning assembly 30 is located in the armature center hole 451 of the gas fuel injector 40 to be tested, the operating connecting block 34 is moved along the connecting rod 31 toward the side away from the probe 24, thereby driving the clamping block 32 to move along the connecting rod 31 toward the deformation block 33, so that the deformation block 33 is in a deformed state.

[0071] In this embodiment, when the tensioning assembly 30 is inserted into the armature bore 451 of the gas fuel injector 40 under test, the deformable block 33 is in its initial state. Subsequently, by manipulating the connecting block 34 along the connecting rod 31 toward the deformable block 33, this action indirectly pushes the pressing block 32 toward 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 bore 451, ensuring effective contact between the tensioning assembly 30 and the internal structure of the gas fuel injector 40 under test. At this point, the entire measurement system (including the probe 24, sensor 23, and tensioning assembly 30) becomes integrated and can be vertically displaced by the telescopic subassembly 21. The sensor 23 records the changes in the force between the probe 24 and the deformable block 33 during the measurement process, thereby generating a force-displacement curve for analyzing spring preload and residual air gap.

[0072] Knot Figure 4 As shown, in a specific embodiment of the present application, the tensioning assembly 30 includes a connecting rod 31, a pressure block 32, a deformation 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 closest to the probe body 240. The nut 35 is located in the mounting groove 241 and cooperates with the mounting groove 241 to limit the displacement of the connecting rod 31, the pressure block 32, and the deformation block 33 in a direction perpendicular to the axial direction of the connecting rod 31. During the measurement process, 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 be stably raised along the axis of the gas fuel injector 40 to be tested. At the same time, the sensor 23 records the changes in the force between the probe 24 and the deformation block 33, forming a force-displacement curve from which the measured values of the spring preload and the residual air gap are extracted.

[0073] In a specific embodiment of the present application, the deformation block 33 can be made of copper, nylon or engineering plastics, so as to achieve an interference fit between the tensioning assembly 30 and the gas fuel injector 40 to be tested, thereby improving the 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 arranged relative to the base 11. The chuck 12 is used to connect to the gas fuel injector 40 to be tested; the bracket 13 is connected to the base 11 and is connected to the telescopic subassembly 21.

[0075] Before measurement, the operator adjusts the position of the chuck 12 using the T-slot on the base 11, based on the size of the gas fuel injector 40 to be tested, to achieve the optimal measurement position. The chuck 12 securely holds the injector in place with its internal jaws, ensuring that the injector does not move during measurement, potentially affecting measurement accuracy. The bracket 13 provides stable and adjustable support for the telescopic subassembly 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 subassembly to accommodate injectors of varying heights, enhancing the versatility of the measurement device.

[0076] Through this design of workbench assembly 10, the measuring device of the present invention can more accurately and efficiently measure the residual air gap and spring preload of the gas fuel injector 40 under test. The movability of chuck 12, combined with the support and adjustment function of bracket 13, not only enhances the adaptability and versatility of the measuring device, but also improves 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 bracket 13 and is movably arranged 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.

[0078] During measurement preparation, the operator can adjust the initial position of the telescopic subassembly 21 by moving the slider 14 along the height of the bracket 13, aligning it precisely with the armature hole 451 of the gas fuel injector 40 under test. This mobility of the slider 14 ensures precise alignment of the measuring device regardless of the injector's installation height, providing an optimal starting point for the measurement process. The backplate 15 is connected to the telescopic subassembly 21, and the connecting base 22 is movably disposed relative to the backplate 15, enabling the telescopic subassembly 21 to drive the connecting base 22 to move relative to the backplate 15.

[0079] Furthermore, the back panel 15 includes a first component segment 151, a second component segment 152 and a guide rail 153. The first component segment 151 is connected to the slider 14; the guide rail 153 is connected to the first component segment 151, and the length direction of the guide rail 153 is arranged along the height direction of the bracket 13. The guide rail 153 is arranged in coordination with the connecting seat 22; the second component segment 152 is connected to the first component segment 151, and the second component segment 152 is connected to the telescopic subassembly 21.

[0080] Combine Figure 1 As shown, in this embodiment, the back plate 15 is connected to the slider 14 through the first component segment 151 so as to enable the slider 14 to move along the height direction of the bracket 13. The second component segment 152 is used to connect the first component segment 151 and the telescopic subassembly 21. It not only strengthens the structural integrity of the back plate 15, but also provides additional support and guidance for the telescopic subassembly 21, ensuring the stability of the measuring assembly 20 when performing measurement tasks. The guide rail 153 provides a guiding function for the movement of the connecting seat 22, ensuring that the telescopic subassembly 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 workbench assembly 10 includes a connecting plate 16 , the chuck 12 is connected to the base 11 via the connecting plate 16 , and the connecting plate 16 is provided in a matching manner with the slide groove 111 .

[0082] During the measurement preparation phase, the operator can adjust the position of the connecting plate 16 on the slide 111 manually or with the help of an external tool, such as a handwheel on the slide rail, thereby driving the chuck 12 and the gas fuel injector 40 to move horizontally until the optimal measurement position is found. Once the position is determined, the operator can use a fastening device to secure the connecting plate 16 to a certain position in the slide 111, ensuring that the position of the gas fuel injector 40 to be tested remains stable during the measurement process.

[0083] Combine Figure 1 and Figure 3 As shown, the workbench assembly 10 includes a base 11, a chuck 12, a bracket 13, a slider 14, and a back plate 15. The base 11 is provided with a slide 111. Specifically, the slide 111 is a T-slot. The chuck 12 is a three-jaw chuck. The slide 111 and the connecting plate 16 allow the position of the chuck 12 to be adjusted to accommodate different injector models. The bracket 13 includes a crossbeam, a stud, and a column. The crossbeam is connected to the stud, which in turn is connected to the column. The slider 14 is an I-shaped slider that is movably connected to at least one of the stud or column.

[0084] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0085] 1) The workbench assembly 10 serves as the base support platform for the entire apparatus, used to secure and adjust the position of the gas fuel injector 40 under test. The measurement assembly 20 provides displacement control and force measurement, generating a force-displacement curve for calculating the spring preload and the residual air gap of the gas fuel injector 40 under test. The tensioning assembly 30 is connected to the armature bore 451 of the gas fuel injector 40 under test. Driven by the measurement assembly 20, the armature and the measurement assembly move synchronously, facilitating direct force measurement. When the tensioning assembly 30 is deformed and tightly attached to the armature, the measurement assembly 20 activates, driving the tensioning assembly 30 and the armature upward, while simultaneously recording the force exerted between the measurement assembly 20 and the tensioning assembly 30 during this movement.

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

[0087] 3) When the measurement assembly 20 is ready and the tensioning assembly 30 has been inserted into the armature bore 451 of the gas fuel injector 40 to be tested and is in a deformed state, ensuring good contact and synchronous movement with the armature 45, the measurement process can begin. At this point, the drive unit 213 (e.g., a stepper motor) receives a start signal and rotates the screw 211. The rotation of the screw 211, through threaded engagement with the screw seat 212, converts the rotational motion into linear motion along the screw axis, thereby driving the screw seat 212, connecting seat 22, sensor 23, probe 24, and tensioning assembly 30 upward. During this movement, the sensor 23 monitors the force between the probe 24 and the tensioning assembly 30 in real time. As the entire device moves, the force changes, gradually increasing from an initial low value until it reaches its maximum value when the armature 45 contacts the core 41. The sensor 23 converts the monitored force value changes and the displacement data of the screw seat 212 into electrical signals and records them to form a force-displacement curve.

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

[0089] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in 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 conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0090] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be 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), the workbench assembly (10) being used to connect to a gas fuel injector (40) to be tested; a measuring assembly (20), wherein a portion of the measuring assembly (20) is connected to the workbench assembly (10), and another portion of the measuring assembly (20) is movably arranged relative to the portion of the measuring assembly (20); a tensioning assembly (30), the tensioning assembly (30) being detachably connected to the measuring assembly (20), the tensioning assembly (30) having an original initial state and a deformed state in which deformation is generated, the tensioning assembly (30) being used to be connected to the armature central 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 applied between the measuring assembly (20) and the tensioning assembly (30) during the movement.

2. The measuring device for a gas fuel injector according to claim 1, characterized in that The measuring assembly (20) comprises: a telescopic subassembly (21), wherein a portion of the telescopic subassembly (21) is connected to the workbench assembly (10), a portion of the telescopic subassembly (21) is connected to another portion of the telescopic subassembly (21), and the other portion of the telescopic subassembly (21) is movably arranged relative to the portion of the telescopic subassembly (21); A connecting seat (22), the connecting seat (22) being connected to the telescopic subassembly (21) of another part; A sensor (23), wherein the sensor (23) is connected to the connecting seat (22); a probe (24), the probe (24) being connected to the tensioning assembly (30), and the probe (24) being connected to the sensor (23); When the tensioning assembly (30) is in the deformed state, part of the telescopic subassembly (21) drives another part of the telescopic subassembly (21), 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, and the sensor (23) measures the force exerted between the probe (24) and the tensioning assembly (30) during the movement.

3. The measuring device for a gas fuel injector according to claim 2, characterized in that The telescopic subassembly (21) comprises: Screw rod (211); a screw rod seat (212), the screw rod (211) being connected to the screw rod seat (212), the screw rod seat (212) being connected to the connecting seat (22), and the screw rod seat (212) being movably arranged relative to the screw rod (211) along the axial direction of the screw rod (211); A driving part (213), wherein an output end of the driving part (213) is connected to the screw rod (211), and the driving part (213) is connected to the workbench assembly (10); When the tensioning assembly (30) is in the deformed state, the driving portion (213) drives the screw (211) to rotate, so that the 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 screw (211), and the sensor (23) measures the force applied between the probe (24) and the tensioning assembly (30) during the movement.

4. The measuring device for a gas fuel injector according to claim 2, characterized in that The telescopic subassembly (21) comprises: a motor connected to the workbench assembly (10); a gear, an output end of the motor being connected to the gear; a rack connected to the connecting seat (22), the rack being arranged in meshing engagement 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) to be tested along the height direction of the workbench assembly (10), and the sensor (23) measures the force between the probe (24) and the tensioning assembly (30) during the movement.

5. The measuring device for a gas fuel injector according to any one of claims 2 to 4, characterized in that The measuring head (24) comprises: a probe body (240), the probe body (240) being connected to the sensor (23); A mounting groove (241), wherein the mounting groove (241) is connected to the tensioning assembly (30).

6. The measuring device for a gas fuel injector according to claim 5, characterized in that The tensioning assembly (30) comprises: A connecting rod (31), the connecting rod (31) being connected to the measuring head (24); A pressing block (32), the pressing block (32) being arranged along the circumference of the connecting rod (31); a deformation block (33), the deformation block (33) being arranged along the circumference of the connecting rod (31), the deformation block (33) being arranged on a side of the connecting rod (31) away from the measuring head (24), and the deformation block (33) having the initial state and the deformed state; a connecting block (34), the connecting block (34) being arranged along the circumference of the connecting rod (31), the connecting block (34) being arranged on a side of the connecting rod (31) away from the measuring head (24), and the pressing block (32) being arranged between the connecting block (34) and the deformation block (33); When the tensioning assembly (30) is located in the armature center hole (451) of the gas fuel injector (40) to be tested, the connecting block (34) is operated to move along the connecting rod (31) toward a side away from the measuring head (24), thereby driving the pressing block (32) to move along the connecting rod (31) toward the deformation block (33), so that the deformation block (33) is in the deformed state.

7. The measuring device for a gas fuel injector according to any one of claims 2 to 4 and 6, characterized in that The workbench assembly (10) comprises: Base (11); a chuck (12), the chuck (12) being connected to the base (11), the chuck (12) being movably arranged relative to the base (11), and the chuck (12) being used to connect to the gas fuel injector (40) to be tested; A bracket (13), the bracket (13) is connected to the base (11), and the bracket (13) is connected to the telescopic subassembly (21).

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

9. The measuring device for a gas fuel injector according to claim 8, characterized in that The back plate (15) comprises: A first assembly segment (151), wherein the first assembly segment (151) is connected to the slider (14); A guide rail (153), the guide rail (153) is connected to the first component segment (151), the length direction of the guide rail (153) is arranged along the height direction of the bracket (13), and the guide rail (153) is arranged in a matching manner with the connecting seat (22); A second component segment (152), wherein the second component segment (152) is connected to the first component segment (151), and the second component segment (152) is connected to the telescopic subassembly (21).

10. The measuring device for a gas fuel injector according to claim 8 or 9, characterized in that The base (11) is provided with a slide groove (111), and the workbench assembly (10) comprises: A connecting plate (16), the chuck (12) is connected to the base (11) via the connecting plate (16), and the connecting plate (16) is arranged in a coordinated manner with the sliding groove (111).

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