A shallow boss measuring device for an aircraft speed governor oil distribution valve

Abstract

This invention discloses a measuring device for a shallow boss on an aircraft governor's oil distribution valve, belonging to the technical field of measuring devices. It includes a fixture body, a measuring jaw, and a spring-loaded pin. The top surface of the fixture body has a workpiece groove and a fixture groove, and the bottom has a measuring groove. The workpiece groove is located on both sides of the fixture groove and is higher than the fixture groove. The workpiece groove is used to place the workpiece to be measured. Both ends of the workpiece are placed in the workpiece groove, and the middle boss is engaged between the fixture groove and the end of the measuring jaw. A through hole is provided in the middle of the fixture groove, and the middle part of the measuring jaw is hinged within the through hole, allowing the measuring jaw to swing within the through hole. The upper end of the measuring jaw forms a movable clamp with one side of the fixture groove, and the lower end abuts against the spring-loaded pin and a dial indicator, respectively. The spring-loaded pin and the dial indicator are positioned opposite each other. The clamp is used to hold the boss of the workpiece to be measured, and the spring-loaded pin is slidably mounted on the fixture body. This invention is a device for measuring the width of a shallow boss on an aircraft governor's oil distribution valve, enabling rapid and accurate measurement of the governor's oil distribution valve.

Description

Technical Field

[0001] This invention relates to the technical field of measuring devices, and in particular to a measuring device for a shallow boss on an aircraft governor oil distribution valve. Background Technology

[0002] The oil distributor valve of a certain type of governor is a crucial component controlling the pressure oil entering the large-pitch oil chamber of the propeller. Its key characteristic is the width of the cylindrical boss that mates with the annular groove of the oil distributor liner. Due to structural limitations, the width of the central boss on the governor's oil distributor valve is difficult to measure accurately. This cylindrical surface consists of three sections with a shallow central boss. Due to machining limitations, the upper and lower end faces of this cylindrical surface cannot be perfectly perpendicular to the cylindrical surface.

[0003] Currently, when using a common-normal micrometer to measure the boss of the governor's oil distribution valve, the repeated measurement error is relatively large due to the influence of the micrometer's tightening force and the depth of the boss being measured. The measurement error between different operators is approximately 0.01mm-0.02mm. Since the clearance required for this part is small and the precision requirement is high, this measurement error has a significant impact on the production and assembly process. The dimension can only be relatively accurate when measuring closer to the outer edge of the cylindrical surface, making it overly reliant on the operator's measurement technique. Therefore, there is an urgent need to design a device for measuring the width of the shallow boss of the governor's oil distribution valve in aircraft, to achieve rapid and accurate measurement of the governor's oil distribution valve. Summary of the Invention

[0004] The purpose of this invention is to provide a measuring device for the shallow protrusion of the governor oil distribution valve in an aircraft, so as to solve the problems existing in the prior art and enable the governor oil distribution valve to be measured quickly and accurately.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a measuring device for a shallow boss on an aircraft speed governor's oil distribution valve, comprising a fixture body, a measuring jaw, and a spring pin. The fixture body has a workpiece groove and a fixture groove on its top surface and a measuring groove on its bottom. The workpiece groove is located on both sides of the fixture groove and is higher than the fixture groove. The workpiece groove is used to place the workpiece to be measured. The two ends of the workpiece to be measured are placed in the workpiece groove, and the middle boss is engaged between the fixture groove and the end of the measuring jaw. A through hole is provided in the middle of the fixture groove. The middle part of the measuring jaw is hinged in the through hole and can swing within the through hole. The upper end of the measuring jaw forms a movable clamp with one side of the fixture groove, and the lower end abuts against the outer end of the spring pin and the detection end of a dial indicator, respectively. The spring pin and the dial indicator are arranged opposite to each other. The clamp is used to clamp the boss of the workpiece to be measured, and the spring pin is slidably disposed on the fixture body.

[0007] Preferably, a mandrel is vertically connected to the bottom through hole of the fixture groove by a bolt, and a square hole is provided on the mandrel. The middle part of the measuring jaw is connected to the square hole by a pin.

[0008] Preferably, a gap of 0.4mm-1mm is provided between the clamping surface of the measuring jaw and the two opposite sides of the hole above the mandrel.

[0009] Preferably, a clamping stop is bolted to the bottom of the clamping slot, and the clamping stop and the measuring jaw form the movable clamp.

[0010] Preferably, the clamp stop is a rectangular stop, and the middle part of the rectangular stop is connected to the bottom of the clamp groove by a pair of locating pins and a pair of bolts.

[0011] Preferably, the clamping surface of the measuring jaw is a plane, the opposite surface of the clamping surface is provided with a V-shaped cross section, and the hinge axis of the measuring jaw is located inside the intersection of the V-shaped cross section.

[0012] Preferably, the spring pin includes a spring, a pin, and a pull rod. A pin hole is provided at the bottom of the tooling body. One end of the pin hole is blocked. The spring and the pin are arranged in sequence in the pin hole. A pair of waist-shaped through holes are respectively opened on both sides of the pin hole. The pull rod passes through the waist-shaped through hole and the pin and protrudes at both ends to form the tooling body.

[0013] Preferably, the pin hole is a through hole, and a bolt is connected to the end of the pin hole; the outer end of the pin is a hemispherical surface.

[0014] Preferably, a dial indicator hole is provided at the bottom of the main body of the tooling, and the dial indicator hole is coaxially arranged with the pin hole of the spring pin; an open bushing is provided in the dial indicator hole, and an adjusting bolt is threaded to the side of the main body of the tooling, the inner end of the adjusting bolt can abut against the open bushing, and the dial indicator is inserted into the open bushing.

[0015] Preferably, the workpiece groove is a V-shaped groove, and the workpiece groove is perpendicular to the centerline of the fixture groove.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] This invention is a device for conveniently and quickly measuring the width of the shallow boss of the governor's oil distribution valve, realizing rapid and accurate measurement of the governor's oil distribution valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the aircraft speed governor oil distribution valve shallow boss measuring device in an embodiment of the present invention;

[0020] Figure 2 This is a front view of the measuring device for the shallow boss of the aircraft speed governor oil distribution valve in an embodiment of the present invention;

[0021] Figure 3 This is an embodiment of the present invention. Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0022] In the diagram: 1-Main fixture, 2-Workpiece slot, 3-Clamp slot, 4-Measuring slot, 5-Clamp stop, 6-Positioning pin, 7-Mandrel, 8-Measuring jaw, 9-Pin, 10-Bolt, 11-Top pin, 12-Spring, 13-Pull rod, 14-Open bushing, 15-Adjusting bolt, 16-Dial indicator, 17-Standard indicator fitting, 18-Oval through hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a measuring device for the shallow protrusion of the governor oil distribution valve in an aircraft, so as to solve the problems existing in the prior art and enable the governor oil distribution valve to be measured quickly and accurately.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figures 1 to 3As shown, this embodiment provides a measuring device for the shallow boss of the oil distribution valve of an aircraft speed governor, including a fixture body 1, a measuring jaw 8, and a spring top pin. The top surface of the fixture body 1 is provided with a workpiece groove 2 and a fixture groove 3, and the bottom is provided with a measuring groove 4. The workpiece groove 2 is located on both sides of the fixture groove 3 and is higher than the fixture groove 3. The workpiece groove 2 is used to place the workpiece to be measured. The two ends of the workpiece to be measured are placed in the workpiece groove 2, and the middle boss is engaged between the fixture groove 3 and the end of the measuring jaw 8. A through hole is provided in the middle of the fixture groove 3. The middle part of the measuring jaw 8 is hinged in the through hole and the measuring jaw 8 can swing in the through hole. The upper end of the measuring jaw 8 forms a movable clamp with one side of the fixture groove 3, and the lower end abuts against the outer end of the spring top pin and the detection end of the dial indicator 16, respectively. The spring top pin and the dial indicator 16 are arranged opposite to each other. The clamp is used to clamp the boss of the workpiece to be measured, and the spring top pin is slidably arranged on the fixture body 1.

[0028] As an optional solution, in this embodiment, a mandrel 7 is vertically connected to the bottom through hole of the fixture slot 3 by bolts 10, and the mandrel 7 is fixed. A square hole is provided on the mandrel 7, and the middle part of the measuring jaw 8 is connected to the square hole by a pin 9. Setting the mandrel 7 can adjust the vertical position of the measuring jaw. The top of the mandrel 7 is preferably flush with the fixture stop 5. After determining the position, tighten the bolts 10 to lock it, and then weld the mandrel 7 to fix it. Directly slotting cannot determine the specific position of the measuring jaw 8, and the drilling position cannot be determined.

[0029] As an optional solution, in this embodiment, a gap is provided between the clamping surface of the measuring jaw 8 and the two opposite sides of the hole above the mandrel 7, with a gap of 0.4mm-1mm, preferably 0.5mm, to facilitate the swinging of the measuring jaw 8.

[0030] As an alternative, in this embodiment, a clamp stop 5 is connected to the bottom of the clamp slot 3 by bolt 10. The clamp stop 5 and the measuring jaw 8 form a movable clamp. The clamp stop 5 is used to position the standard dial indicator 17 or the shallow boss of the oil separator valve.

[0031] As an optional solution, in this embodiment, the clamp stop 5 is a rectangular stop. The middle part of the rectangular stop is connected to the bottom of the clamp groove 3 by a pair of positioning pins 6 and a pair of bolts to fix the position of the clamp stop 5. The clamp stop 5 is positioned by the positioning pins 6 to ensure that the horizontal positioning of the clamp stop 5 is correct, and the bolts are used to fix and lock the clamp stop 5.

[0032] As an optional solution, in this embodiment, the clamping surface of the measuring jaw 8 is a plane, and the opposite surface of the clamping surface is provided with a V-shaped cross-section to facilitate swinging and thus convenient clamping of the boss of the workpiece to be measured. The hinge axis of the measuring jaw 8 is located inside the intersection of the V-shaped cross-sections. In this embodiment, the measuring jaw 8 is a movable part, one end of which is used to clamp the shallow boss of the oil distribution valve, and the other end abuts against the dial indicator 16 to transmit displacement values.

[0033] As an optional solution, in this embodiment, the spring top pin includes a spring 12, a top pin 11, and a pull rod 13. A top pin hole is provided at the bottom of the fixture body 1, one end of which is sealed. The spring 12 and the top pin 11 are arranged sequentially inside the top pin hole. A pair of oblong through holes 18 are respectively opened on both sides of the top pin hole. The pull rod 13 passes through the oblong through holes 18 and the top pin 11, and its two ends protrude to form the fixture body 1. The spring top pin is used to press against the lower end of the measuring jaw 8, and the upper end of the measuring jaw 8 can clamp the boss of the workpiece to be measured by lever function. The spring 12 can be used to provide axial thrust to the top pin 11, so that the top pin 11 can always press against the measuring jaw 8. When clamping the boss of the workpiece to be measured, the pull rod 13 pulls the top pin 11 to open the top of the measuring jaw 8.

[0034] As an optional solution, in this embodiment, the top pin hole is a through hole, and a bolt 10 is connected to the end of the top pin hole, which can be used to adjust the magnitude of the spring force; the outer end of the top pin 11 is a hemispherical surface, which facilitates abutment with the measuring claws 8 at various angles.

[0035] As an optional solution, in this embodiment, a dial indicator hole is provided at the bottom of the fixture body 1, and the dial indicator hole is coaxially arranged with the pin hole of the spring top pin; an open bushing 14 is provided in the dial indicator hole, and an adjusting bolt 15 is threadedly connected to the side of the fixture body 1 to adjust the tightness of the open bushing 14. The inner end of the adjusting bolt 15 can abut against the open bushing 14, and a dial indicator 16 is inserted into the open bushing 14. The ends of the spring top pin, the dial indicator 16, and the measuring jaw 8 are all located in the measuring groove 4; the open bushing 14 is a hollow cylindrical copper sleeve with an open side wall, and its inner diameter can be changed by pressing its side wall with the adjusting bolt, thereby clamping the rod of the dial indicator 16.

[0036] As an optional solution, in this embodiment, the workpiece groove 2 is a V-shaped groove used to support the oil distribution valve; the workpiece groove 2 is perpendicular to the centerline of the fixture groove 3, which makes it easy for the central boss of the workpiece to be tested to directly fit into the fixture groove 3.

[0037] This embodiment provides a tooling assembly for measuring the shallow boss of the governor oil distributor valve. It is convenient to use and quick to measure, and can effectively reduce measurement errors caused by measurement methods. It overcomes the problem that the existing technology cannot accurately measure the width of the governor oil distributor valve boss.

[0038] Example 2

[0039] This embodiment provides a method for measuring the shallow boss of the fuel distribution valve of an aircraft speed governor using a standard gauge 17. The specific operation process and working principle are as follows:

[0040] S1. Insert the dial indicator 16 into the tooling mounting port and press it against the measuring jaw 8. Tighten the adjusting bolt 15 so that the open bushing 14 clamps the dial indicator 16.

[0041] S2, pull the lever 13 to move the top pin 11 toward the compression spring 12. At this time, the measuring jaw 8 rotates around the cylindrical pin under the clamping force of the dial indicator 16, and the distance between the measuring jaw 8 and the clamping block 5 opens. Place the standard dial indicator 17 in the V-groove of the tooling body 1, and make the boss of the standard dial indicator 17 between the clamping block 5 and the measuring jaw 8. Slowly remove the pulling force of the lever 13 on the top pin 11. Under the action of the spring force, the top pin 11 pushes the measuring jaw 8. The measuring jaw 8 rotates around the cylindrical pin and clamps the boss of the standard dial indicator 17 together with the clamping block 5.

[0042] S3 sets the dial of the thousandths meter to 0.

[0043] S4, pull the lever 13 to open the distance between the measuring jaw 8 and the clamp stop 5, and remove the standard calibration piece 17.

[0044] S5, following the steps outlined in 2S, place the oil distribution valve to be tested on the fixture, clamping the workpiece (shallow boss of the oil distribution valve) between the measuring jaw 8 and the clamping block 5, and read the measured value A of the dial indicator 16 at this time. If we assume that the boss width of the standard dial indicator 17 is X, then the measured value B of the shallow boss of the oil distribution valve is X + A.

[0045] In this embodiment, the opening and closing of the measuring jaw 8 is controlled by the top pin 11. The measuring jaw 8 and the clamping block 5 are used to clamp the shallow boss of the oil distribution valve. The lower end of the measuring jaw 8 is in contact with the dial indicator 16. The measuring jaw 8 is pre-pressed by the head of the dial indicator 16. The dial indicator 16 is fixed by the combination of the adjusting bolt 15 and the open bushing 14. The width of the shallow boss of the oil distribution valve is calculated by comparing the measured movement distance of the measuring jaw 8 with the width of the boss of the standard gauge 17. This method can ensure that the measured position and measuring force of the measuring jaw 8 and the stop are consistent, effectively improving the accuracy of the measurement data.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A measuring device for a shallow boss on an aircraft governor's oil distribution valve, characterized in that: The fixture includes a main body, measuring jaws, and a spring-loaded top pin. The main body has a workpiece groove and a fixture groove on its top surface, and a measuring groove on its bottom. The workpiece grooves are located on both sides of the fixture groove and are higher than the fixture groove. The workpiece grooves are used to place the workpiece to be measured. Both ends of the workpiece are placed in the workpiece grooves, and a central boss is engaged between the fixture groove and the end of the measuring jaw. A through hole is provided in the middle of the fixture groove, and the middle part of the measuring jaw is hinged within the through hole, allowing the measuring jaw to swing within the through hole. The upper end of the measuring jaw and one side of the fixture groove form a movable clamp. The lower end of the fixture abuts against the outer end of the spring pin and the measuring end of the dial indicator, respectively. The spring pin and the dial indicator are arranged opposite to each other. The fixture is used to clamp the boss of the workpiece to be measured. The spring pin is slidably disposed on the fixture body. A dial indicator insertion hole is provided at the bottom of the fixture body. The dial indicator insertion hole is coaxially arranged with the pin hole of the spring pin. An open bushing is provided in the dial indicator insertion hole. An adjusting bolt is threaded to the side of the fixture body. The inner end of the adjusting bolt can abut against the open bushing. The dial indicator is inserted into the open bushing.

2. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 1, characterized in that: A mandrel is vertically connected to the bottom through hole of the fixture groove by bolts. A square hole is provided on the mandrel, and the middle part of the measuring jaw is connected to the square hole by a pin.

3. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 2, characterized in that: A gap of 0.4mm-1mm is provided between the clamping surface of the measuring jaw and the two opposite sides of the hole above the mandrel.

4. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 1, characterized in that: A clamp stop is bolted to the bottom of the clamp slot, and the clamp stop and the measuring jaw form the movable clamp.

5. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 4, characterized in that: The clamp stop is a rectangular stop, and the middle part of the rectangular stop is connected to the bottom of the clamp groove by a pair of locating pins and a pair of bolts.

6. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 1, characterized in that: The clamping surface of the measuring jaw is a plane, and the opposite surface of the clamping surface is provided with a V-shaped cross-section. The hinge axis of the measuring jaw is located inside the intersection of the V-shaped cross-sections.

7. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 1, characterized in that: The spring pin includes a spring, a pin, and a pull rod. A pin hole is provided at the bottom of the tooling body. One end of the pin hole is blocked. The spring and the pin are arranged in sequence in the pin hole. A pair of waist-shaped through holes are respectively opened on both sides of the pin hole. The pull rod passes through the waist-shaped through hole and the pin and protrudes at both ends to form the tooling body.

8. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 7, characterized in that: The pin hole is a through hole, and a bolt is connected to the end of the pin hole; the outer end of the pin is a hemispherical surface.

9. The measuring device for the shallow boss of the aircraft governor oil distribution valve according to claim 1, characterized in that: The workpiece groove is a V-shaped groove, and the centerline of the workpiece groove is perpendicular to that of the fixture groove.

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