Three-coordinate positioning tool for measuring outer needle valve of oil injector assembly

Abstract

The utility model relates to the technical field of three-coordinate positioning tools, and discloses a three-coordinate positioning tool used for measuring an outer needle valve of an oil injector assembly, which comprises a foundation slab, the upper surface of the foundation slab is provided with a base, and the two sides and the middle part of the surface of the base are provided with group holes; the pressing plates are arranged on the two sides and the middle of the upper surface of the base, threaded holes are formed in the two sides of the upper surface of each pressing plate, threaded holes are formed in the positions, corresponding to the threaded holes of the pressing plates, of the upper surface of the base, and bolts are connected to inner cavities of the threaded holes in a screwed mode. According to the device, only one probe group and two probes need to be assembled, the number of probe assemblies is reduced to the greatest extent, system errors caused by excessive probes are avoided, full-size detection of three parts can be completed by operating a measurement program once, measurement errors caused by two-time clamping detection of the parts are avoided, the part clamping time is shortened, and the detection efficiency is improved. And the accuracy of a measurement result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of three-coordinate positioning tooling, in particular to a three-coordinate positioning tooling for measuring an outer needle valve of an injector assembly. Background Art

[0002] The injector is one of the most important parts of the diesel engine combustion system. It is a precision device with very high processing accuracy. Its main function is to spray the high-pressure diesel from the injection pump into the combustion chamber in the form of mist. The working performance of the injector has an important impact on the power, fuel consumption, emissions and service life of the diesel engine. Therefore, the detection of parameters such as the size, shape and position tolerance and matching clearance of the key components of the injector is an important part of quality control and an important guarantee for verifying whether the processing technology meets the requirements.

[0003] The injector is mainly composed of the injector body, nozzle, needle valve pair (needle valve body, thrust seat, outer needle valve), check valve pair (inner needle valve sleeve, inner needle valve, thrust seat), injector head and other parts. The outer needle valve is its key component, and the manufacturing process and quality control are extremely strict. On the one hand, the measurement accuracy of the key features of the outer needle valve is high, such as the matching clearance between the outer needle valve and the needle valve body is 0.013mm-0.016mm, the matching clearance between the outer needle valve and the thrust seat is 0.013mm-0.026mm, the cylindricality of the outer needle valve is 0.002mm, and the runout between the inner hole and the outer circle of the outer needle valve is 0.003mm; on the other hand, there are many parameters of parts to be measured, and the number is increasing, resulting in a large increase in workload. The conventional measurement method requires the parts to be turned around and clamped. A part needs to be clamped and tested twice to complete the detection of all key characteristics. The parts are easily damaged during the clamping process, and the measurement efficiency is not high. Therefore, in order to better utilize the production capacity of three-dimensional coordinate measuring equipment and improve measurement efficiency and the accuracy of test data, it is necessary to improve the existing clamping methods and detection methods. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a three-coordinate positioning tool for measuring the external needle valve of an injector assembly, so as to solve the problems proposed in the above background technology that a part needs to be clamped and tested twice to complete the detection of all key characteristics, the part is easily damaged during the clamping process, and the measurement efficiency is low.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model provides the following technical solution: a three-coordinate positioning tool for measuring the outer needle valve of the injector assembly, comprising:

[0008] A base plate, wherein a base is provided on the upper surface of the base plate, and a group of holes are opened on both sides and the middle of the surface of the base;

[0009] A pressing plate is arranged on both sides and the middle of the upper surface of the base, threaded holes are provided on both sides of the upper surface of the pressing plate, threaded holes are also provided at positions corresponding to the threaded holes of the upper surface of the base and the pressing plate, and bolts are screwed into the inner cavities of the threaded holes;

[0010] The pressing block is arranged at the bottom of the pressing plate, and the bottom of the pressing block is designed to be arc-shaped.

[0011] Preferably, mounting holes are provided on both sides of the upper surface of the base plate and on the front and rear parts of the upper surface, the inner cavities of the mounting holes are screwed with mounting rods, the upper parts of the mounting rods are screwed to the bottom of the base, and the base can be installed on the upper surface of the base plate through the mounting rods.

[0012] Preferably, hidden holes are opened at positions corresponding to the bottom of the base base plate and the mounting holes, and the nut surfaces of the mounting rods are located in the inner cavity of the hidden holes. The hidden holes can hide the nut surfaces of the mounting rods, so that no raised parts appear at the bottom of the base base plate, and the base base plate can be placed stably on the table top.

[0013] Preferably, mounting frames are installed on both sides and the middle of the back side of the base base plate, and a first threaded rod is installed on the left inner wall of the mounting frame through a bearing, and a second threaded rod is installed on the right end of the first threaded rod. The threads of the first threaded rod and the second threaded rod are designed in opposite directions, and rotating the second threaded rod can drive the first threaded rod to rotate.

[0014] Preferably, movable plates are screwed onto the surfaces of the first threaded rod and the second threaded rod, and auxiliary hoops are installed on the upper surfaces of the movable plates. The movable plates will also move as they move, thereby driving the auxiliary hoops to move and fit the outer circle of the parts to assist in limiting the parts.

[0015] Preferably, a slider is installed at the bottom of the movable plate, a slide groove is opened on the upper surface of the bottom plate of the mounting frame, and the slider is embedded in the inner cavity of the slide groove. The slider and the slide groove enable the movable plate to move linearly.

[0016] Beneficial Effects

[0017] Compared with the prior art, the utility model provides a three-coordinate positioning tool for measuring the outer needle valve of the injector assembly, which has the following beneficial effects:

[0018] The three-coordinate positioning fixture for measuring the outer needle valve of the injector assembly has an additional base with a corresponding base shape according to the ideal outer contour of the outer circle of the two gears of the outer needle valve, that is, a group of holes consisting of a hole with a diameter of 35 and a hole with a diameter of 20.5, and the center of the group of holes coincides with the axis of the part, which maximizes the sufficient fitting area of ​​the contact surface while ensuring that there is an appropriate gap between the probe and the fixture. After the part and the base are fully fitted, it serves as the positioning reference in the first direction of the part to ensure that the part and the axis of the measuring machine are in a parallel state, avoiding the shaft part of the long probe from being in contact with the The parts interfere and affect the accuracy of the measurement results; after the pressure block fits the outer circle of the part, the part is completely positioned. After the part is positioned, tighten the bolts and use the pressure block itself to press the outer circle of the part. The clamping force on both sides is symmetrical, and the clamping is stable. No additional clamping device and operation are required. After the inspection is completed, just loosen the pressure plate. The clamping and disassembly operations are convenient and fast; the device only needs to assemble one probe group and two probes, which minimizes the number of probe components, avoids system errors caused by too many probes, and reduces the calibration time of the probe, saving the inspection cost. Running the measurement program once can complete the full-size inspection of three parts, avoid the measurement error caused by the two clamping inspections of the parts, shorten the clamping time of the parts, improve the accuracy of the measurement results, and also improve the efficiency of the inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the back structure of the base of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the base of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the pressing plate of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the foundation base plate of the utility model;

[0024] Figure 6 This is a schematic diagram of the bottom structure of the basic bottom plate of the utility model;

[0025] Figure 7 It is a schematic diagram of the installation structure of the auxiliary hoop of the utility model.

[0026] In the figure: 1. base plate; 2. base; 201. group hole; 3. pressure plate; 4. threaded hole; 5. bolt; 6. pressure block; 7. mounting hole; 8. mounting rod; 9. hidden hole; 10. mounting frame; 11. first threaded rod; 12. second threaded rod; 13. movable plate; 14. auxiliary hoop; 15. slider; 16. slide groove. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model provides a technical solution, a three-coordinate positioning tool for measuring the outer needle valve of the injector assembly, please refer to Figure 1 , including a base plate 1, the upper surface of which is provided with a base 2, see Figure 3 , both sides and the middle of the surface of the base 2 are provided with a group of holes 201;

[0029] See also Figure 1 , the pressing plate 3 is arranged on both sides and the middle of the upper surface of the base 2, please refer to Figure 3 , threaded holes 4 are provided on both sides of the upper surface of the pressing plate 3, and threaded holes 4 are also provided on the upper surface of the base 2 at positions corresponding to the threaded holes 4 of the pressing plate 3, see Figure 2 , the inner cavity of the threaded hole 4 is screwed with a bolt 5;

[0030] See also Figure 4 , a pressing block 6 is arranged at the bottom of the pressing plate 3, and the bottom of the pressing block 6 is of arc-shaped design;

[0031] According to the ideal outer contour of the outer circle of the two gears of the outer needle valve, the base 2 is set with a corresponding base 2 shape, that is, a group hole 201 composed of a hole with a diameter of 35 and a hole with a diameter of 20.5, and the center of the group hole 201 coincides with the axis of the part, which maximizes the sufficient fitting area of ​​the contact surface and ensures that there is an appropriate gap between the probe and the tooling. After the part and the base 2 are fully fitted, it serves as the positioning reference of the first direction of the part to ensure that the part and the axis of the measuring machine are in a parallel state, avoiding the interference of the shaft of the long probe with the part and affecting the accuracy of the measurement result;

[0032] After the pressing block 6 fits with the outer circle of the part, the part is completely positioned. After the part is positioned, tighten the bolt 5, and use the pressing block 6 to press the outer circle of the part. The pressing forces on both sides are symmetrical, and the clamping is stable. No additional clamping device and operation are required. After the inspection is completed, just loosen the pressing plate 3. The clamping and disassembly operations are convenient and quick;

[0033] The device only needs to assemble one probe set and two probes, which minimizes the number of probe components, avoids system errors caused by too many probes, reduces probe calibration time, and saves detection costs. Running the measurement program once can complete the full-size detection of three parts, avoid measurement errors caused by two clamping tests of parts, shorten part clamping time, improve the accuracy of measurement results, and greatly improve detection efficiency.

[0034] See also Figure 5 Mounting holes 7 are provided on both sides of the upper surface and the front and rear parts of the upper surface of the foundation base plate 1. Mounting rods 8 are screwed into the inner cavities of the mounting holes 7. The upper parts of the mounting rods 8 are screwed to the bottom of the base 2. The base 2 can be mounted on the upper surface of the foundation base plate 1 through the mounting rods 8.

[0035] See also Figure 6 Hidden holes 9 are provided at the bottom of the base plate 1 at positions corresponding to the mounting holes 7, and the nut surfaces of the mounting rods 8 are located in the inner cavity of the hidden holes 9. The hidden holes 9 can hide the nut surfaces of the mounting rods 8, so that there will be no raised parts at the bottom of the base plate 1, and the base plate 1 can be placed stably on the table.

[0036] See also Figure 2 The base plate 1 is provided with mounting brackets 10 on both sides and the middle of the back side. Figure 7 A first threaded rod 11 is installed on the left inner wall of the mounting frame 10 through a bearing, and a second threaded rod 12 is installed on the right end of the first threaded rod 11. The threads of the first threaded rod 11 and the second threaded rod 12 are designed in opposite directions. Rotating the second threaded rod 12 can drive the first threaded rod 11 to rotate.

[0037] The surfaces of the first threaded rod 11 and the second threaded rod 12 are both screwed with a moving plate 13, and the upper surfaces of the moving plates 13 are both installed with auxiliary hoops 14. The moving plates 13 will also move, thereby driving the auxiliary hoops 14 to move and fit the outer circle of the parts to assist in limiting the parts.

[0038] The bottom of the movable plate 13 is provided with a slider 15 , the upper surface of the bottom plate of the mounting frame 10 is provided with a slide groove 16 , the slider 15 is embedded in the inner cavity of the slide groove 16 , and the slider 15 and the slide groove 16 enable the movable plate 13 to move linearly.

[0039] In this device, first, according to the ideal outer contour of the outer circle of the two gears of the outer needle valve, the base 2 is set with a corresponding base 2 shape, that is, a group hole 201 composed of a hole with a diameter of 35 and a hole with a diameter of 20.5, and the center of the group hole 201 coincides with the axis of the part, so as to maximize the sufficient fitting area of ​​the contact surface and ensure that there is an appropriate gap between the measuring needle and the tooling. After the part and the base 2 are fully fitted, it serves as a positioning reference for the first direction of the part to ensure that the part and the axis of the measuring machine are in a parallel state, avoiding the interference of the shaft part of the long measuring needle with the part and affecting the accuracy of the measurement result; then, rotating the second threaded rod 12 can drive the first threaded rod 11 to rotate, and the movable plate 13 will also move with it, and the first threaded rod 11 and the second threaded rod 12 will rotate. The threads of the two threaded rods 12 are designed in opposite directions, so that the auxiliary hoop 14 can be driven to move relative to each other, and then the auxiliary hoop 14 can be driven to move and fit with the outer circle of the part, and the part is assisted in limiting. Finally, after the pressure block 6 fits with the outer circle of the part, the part is completely positioned. After the part is positioned, the bolt 5 is tightened, and the pressure block 6 itself is used to press the outer circle of the part. The clamping force on both sides is symmetrical, and the clamping is stable. No additional clamping device and operation are required. After the detection is completed, the pressure plate 3 can be loosened, and the clamping and disassembly operations are convenient and fast; so that the device only needs to assemble one probe group and two probes, which minimizes the number of probe components, avoids the system error caused by too many probes, and reduces the calibration time of the probe, saving the detection cost. The full-size detection of three parts can be completed by running the measurement program once, avoiding the measurement error caused by the two clamping detection of the parts, shortening the clamping time of the parts, improving the accuracy of the measurement results, and also improving the efficiency of the detection.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-coordinate positioning tool for measuring the outer needle valve of an injector assembly, characterized in that: include: A basic bottom plate (1), wherein a base (2) is provided on the upper surface of the basic bottom plate (1), and groups of holes (201) are provided on both sides and the middle of the surface of the base (2); A pressure plate (3) is arranged on both sides and the middle of the upper surface of the base (2), and threaded holes (4) are provided on both sides of the upper surface of the pressure plate (3). Threaded holes (4) are also provided at positions corresponding to the threaded holes (4) of the pressure plate (3) on the upper surface of the base (2), and bolts (5) are screwed into the inner cavities of the threaded holes (4); The pressing block (6) is arranged at the bottom of the pressing plate (3), and the bottom of the pressing block (6) is of arc-shaped design.

2. A three-coordinate positioning tool for measuring the outer needle valve of an injector assembly according to claim 1, characterized in that: The upper surface of the base bottom plate (1) is provided with mounting holes (7) on both sides and at the front and rear of the upper surface. The inner cavities of the mounting holes (7) are screwed with mounting rods (8), and the upper parts of the mounting rods (8) are screwed to the bottom of the base (2).

3. A three-coordinate positioning tool for measuring the outer needle valve of an injector assembly according to claim 2, characterized in that: Hidden holes (9) are provided at positions corresponding to the bottom of the base plate (1) and the mounting holes (7), and the nut surfaces of the mounting rods (8) are located in the inner cavity of the hidden holes (9).

4. The three-coordinate positioning tool for measuring the outer needle valve of the injector assembly according to claim 1, characterized in that: The back sides and the middle of the base bottom plate (1) are both equipped with mounting frames (10), the left inner wall of the mounting frame (10) is equipped with a first threaded rod (11) via a bearing, the right end of the first threaded rod (11) is equipped with a second threaded rod (12), and the threads of the first threaded rod (11) and the second threaded rod (12) are both designed in opposite directions.

5. The three-coordinate positioning tool for measuring the outer needle valve of the injector assembly according to claim 4, characterized in that: A movable plate (13) is screwed onto the surface of the first threaded rod (11) and the second threaded rod (12), and an auxiliary hoop (14) is installed on the upper surface of the movable plate (13).

6. A three-coordinate positioning tool for measuring the outer needle valve of an injector assembly according to claim 5, characterized in that: The bottom of the movable plate (13) is provided with a sliding block (15), the upper surface of the bottom plate of the mounting frame (10) is provided with a sliding groove (16), and the sliding block (15) is embedded in the inner cavity of the sliding groove (16).

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