A plunger assembly axial clearance measuring device

Abstract

The application provides a plunger assembly axial gap measuring device, the measuring device comprising: a base; a mounting assembly comprising a cantilever frame, the mounting assembly being arranged on the base; a measuring assembly connected to one end of the cantilever frame, the measuring assembly being connected to a cylindrical end of a plunger assembly; wherein the measuring assembly is used for measuring the axial gap of the plunger assembly; a sliding shoe assembled with a ball head of the plunger assembly; wherein the sliding shoe is fixedly arranged on the base; the application solves the problem of free sagging of the plunger rod during measurement through the structural design of the measuring frame main body structure, controls the size and direction of the applied force, quantifies the tension value, and realizes one machine with multiple uses and expands the use range of a single structure in mechanical processing measurement through the modular design of the elastic bushing of the measuring head mounting seat.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aviation manufacturing measurement, and particularly relates to a plunger assembly axial gap measuring device. BACKGROUND

[0002] The plunger assembly is widely applied in the field of hydraulic pumps and is a key component of the products. After the plunger assembly is processed, the axial gap between the plunger seat and the ball head of the plunger rod needs to be measured. At present, the measurement of the inner hole of the plunger assembly generally adopts a horizontal measurement method. The plunger rod in the plunger assembly needs to be fixed, and then an axial pulling force is applied to the sliding shoe. The value is read through a dial gauge. The disadvantage of this method is that the pulling force cannot be quantified. Whether the force is along the axial direction cannot be guaranteed. The strength of a larger plunger assembly is large. The method can measure a certain gap value under the premise of avoiding damage to the plunger assembly, but for smaller plunger assemblies, especially micro motor plunger assemblies, the product appearance will be damaged. However, the measurement period of this method is long, and it cannot meet the requirements of large-scale production.

[0003] Therefore, in order to meet the measurement requirements, a new measurement structure needs to be designed to solve the problem of free drooping of the plunger rod during measurement, control the applied force, and also consider the actual needs of the production site to reduce the number of measurement tools. The use range of a single structure is expanded in mechanical processing measurement. SUMMARY

[0004] The purpose of the application is to provide a plunger assembly axial gap measuring structure under the action of a pulling force, which has high measurement accuracy, is convenient and reliable to measure, and has a wide application range.

[0005] The application provides a plunger assembly axial gap measuring device, characterized in that the measuring device comprises:

[0006] a base;

[0007] a mounting assembly comprising a cantilever frame, the mounting assembly being arranged on the base;

[0008] a measuring assembly connected to one end of the cantilever frame, the measuring assembly being connected to the cylindrical end of the plunger assembly; wherein the measuring assembly is used to measure the axial gap of the plunger assembly;

[0009] a sliding shoe assembled with the ball head of the plunger assembly; wherein the sliding shoe is fixedly arranged on the base.

[0010] a guide rail frame comprising a U-shaped groove, the guide rail frame being arranged on the base;

[0011] An instrument support connected with the rail frame through the U-shaped groove; wherein the instrument support is movable along the U-shaped groove.

[0012] Preferably, the instrument support comprises:

[0013] An arm comprising a through hole, the arm being used for disposing the measuring assembly;

[0014] A column connected with the arm; wherein the cantilever frame is disposed on the column, the cantilever frame being rotatable around the column; the other end of the cantilever frame is provided with a weight.

[0015] Preferably, the measuring assembly comprises:

[0016] A measuring meter disposed on the arm; wherein the measuring meter comprises a first connecting rod and a second connecting rod, the first connecting rod being connected with one end of the cantilever frame, the second connecting rod passing through the through hole;

[0017] A measuring head mounting seat connected with the second connecting rod; wherein the measuring head mounting seat is used for mounting a cylindrical end of a plunger assembly.

[0018] Preferably, the measuring head mounting seat comprises:

[0019] A mounting seat;

[0020] An elastic bushing disposed in the mounting seat;

[0021] A first screw used for fixing the cylindrical end of the plunger assembly in the mounting seat.

[0022] Preferably, the measuring device further comprises:

[0023] A pressing plate disposed on the base, the pressing plate being used for fixing the sliding shoe part;

[0024] A backing plate disposed between the base and the pressing plate.

[0025] Preferably, the pressing plate comprises:

[0026] A U-shaped structure used for pressing the sliding shoe;

[0027] Or, a V-shaped structure used for pressing the sliding shoe.

[0028] Preferably, the instrument support is of a T-shaped structure; the distance from the weight to the rotation center of the cantilever frame is equal to the distance from the measuring meter to the rotation center of the cantilever frame.

[0029] The beneficial technical effects of the present application are:

[0030] The application solves the problem of free drooping of the plunger rod during measurement through the structural design of the main structure of the measuring rack, controls the size and direction of the applied force, quantifies the tensile force value, and realizes one machine with multiple uses and expansion of the use range of a single structure in mechanical processing measurement through the modular design of the elastic bushing of the measuring head mounting seat. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is the main view of the plunger assembly axial gap measurement structure under the action of the tensile force of the application;

[0032] Figure 2 is the top view of the base structure;

[0033] Figure 3 is the main view of the guide rail frame structure;

[0034] Figure 4 is the top view of the guide rail frame structure;

[0035] Figure 5 is the right view of the guide rail frame structure;

[0036] Figure 6 is the main view of the instrument support structure;

[0037] Figure 7 is the top view of the instrument support structure;

[0038] Figure 8 is the main view of the cantilever frame structure;

[0039] Figure 9 is the top view of the cantilever frame structure;

[0040] Figure 10 is the top view of the measuring head mounting seat 11-1 structure;

[0041] Figure 11 is the main view and sectional view of the pressing plate 1 structure;

[0042] Figure 12 is the top view of the pressing plate 1 structure;

[0043] Figure 13 is the structural schematic diagram of the measured plunger assembly;

[0044] Figure 14 is the working state diagram of the device when measuring a small-diameter plunger assembly;

[0045] Figure 15 is the working state diagram of the measuring device when measuring a large-diameter plunger assembly;

[0046] Wherein: 1 - base, 2 - guide rail frame, 3 - cylindrical pin, 4 - second screw, 5 - instrument support, 6 - weight frame, 7 - cantilever frame, 8 - cylindrical pin, 9 - measuring table, 10 - third screw, 11 - measuring head mounting seat, 12 - first screw, 13 - fourth screw, 14 - elastic bushing, 15 - backing plate, 16 - pressing plate. DETAILED DESCRIPTION

[0047] The application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application. Figures 1-15

[0048] As shown in the drawings, the application provides a plunger assembly axial gap measuring device, and the measuring fixture includes a base 1, a guide rail frame 2, an instrument support 5, a weight 6, a cantilever frame 7, a measuring head mounting seat 11, an elastic bushing 14, and a pressing plate 16. Figure 1 As shown in the drawings,

[0049] , Figure 1 , Figure 3 , Figure 4 , Figure 5 , the guide rail frame 2 is installed on the planar structure 1-1 of the base 1 without displacement. The sliding groove 5-1 of the instrument support 5 is matched with the groove structure 2-1 on the guide rail frame 2, and the instrument support 5 can slide freely along the groove structure 2-1 on the guide rail frame 2 and stop at any position; the cylindrical hole structure 7-1 on the cantilever frame 7 is coaxially installed with the cylindrical hole structure 5-4 of the instrument support 5, and the cantilever frame 7 can rotate freely around the shaft; the lower end of the measuring instrument is fixed at the circular hole structure 5-2 of the instrument support 5, and the upper end of the measuring instrument is connected with the fork-shaped structure 7-2 on the cantilever frame 7, so that the force applied by the cantilever frame 7 to the measuring instrument is always perpendicular to the planar structure 1-1 of the base 1; the measuring head mounting seat 11 is fixedly connected with the lower end of the measuring instrument; the pressing plate 16 is fixed on the surface of the planar structure 1-1 of the base 1 and can rotate and move freely; the weight 6 is installed at the groove structure 7-3 of the cantilever frame 7.

[0050] As shown in the drawings, ,

[0051] , the height of the instrument support 5 is adjusted to ensure that the measuring head mounting seat 11 is always perpendicular to the planar structure 1-1 of the base 1.

[0052] As shown in the drawings, ,

[0053] , the U-shaped groove structure 2-1 is provided on the guide rail frame 2, and the closed groove structure 2-2 is opened on the side of the through groove, and the side wall of the U-shaped groove structure is perpendicular to the mounting surface of the base 1 on the guide rail frame 2. Figure 6 Figure 7 As shown in the drawings,

[0054] The distance H from the bottom of the hole in the middle plane structure 11-1 to the plane structure 1-1 on the base 1 is equal to the length of the measured plunger assembly.

[0055] The instrument support 5 is a T-shaped structure, and the outer shape is symmetrical, and the circular hole structure 5-2 is provided with a through groove along the symmetrical structure center of the concave sliding groove structure 5-1 from the 5-5 end face, and the diameter is greater than the outer diameter of the fixed position of the measuring instrument.

[0056] The groove structure 5-3 is provided on the outer side of the circular hole structure 5-2 to increase the elasticity of the measuring instrument installation position 5, and the vertical surface of the groove structure 5-2 is provided with coaxial light holes and threaded hole structures.

[0057] As shown in the drawings, Figure 10 The size of the hole in the sink hole structure 11-1 on the measuring head mounting seat 11 matches the outer diameter of the plunger rod in the measured plunger assembly.

[0058] The sink hole structure 11-1 on the measuring head mounting seat 11 can be installed with an elastic bushing 14 of soft material, and when the product is installed, the elastic bushing 14 is pushed and tightened by a screw through the threaded hole on the side of the sink hole structure 11-1 on the mounting seat 11, to realize the fixation of the measured product.

[0059] As shown in the drawings, Figure 11 , Figure 12 The pressing surface 16-1 of the pressing plate 16 is pressed on the step position of the measured product, and the fork structure 16-2 can adopt a U-shaped structure or a V-shaped structure according to the pressing surface structure. The pressing position can be wrapped with soft material with lower hardness than the tested product, or the pressing plate 16 can be made of an organic material. The fork structure 7-2 at one end of the cantilever frame 7 can adopt a U-shaped structure or a V-shaped structure.

[0060] In other embodiments of the present application, as shown in the drawings, Figure 8 , Figure 9 The other end of the cantilever frame 7 is provided with a groove structure 7-3 for installing a weight hanging frame, and the distance from the weight hanging position to the rotation axis is equal to the distance from the cantilever frame 7 to the connection position of the measuring instrument. As shown in the drawings, Figure 2 The plane 1-1 on the base 1 can place a smooth solid soft material pad 15; as shown in the drawings, Figure 13 The plunger rod of the plunger assembly is placed in the matched elastic bushing 14, and the pressing plate 16 acts on the step surface of the plunger assembly.

[0061] In other embodiments of the present application, as shown in the drawings, Figure 15As shown, the product is a large-diameter hydraulic motor plunger assembly, the axial gap measurement of which is 0.1 mm under a 17.8 N pulling force. The plunger assembly axial gap measurement structure under the pulling force is used, and the elastic bushing 14 and the measurement head mounting seat of a proper size are selected. The plunger rod is fixed in the elastic bushing 14, and the second screw 4 sliding instrument support 5 is adjusted until the plunger assembly sliding shoe seat contacts the base plate 15. The step surface of the sliding shoe is pressed by the pressing plate, the measuring instrument is adjusted and zeroed. The weight of the prescribed force value or the weight of the same weight is prevented on the weight shelf, and the reading of the measuring instrument is observed, which is the axial gap value under the prescribed pulling force.

[0062] In other embodiments of the present application, as shown in Figure 14 the product is a plunger assembly axial gap measurement in a miniature hydraulic pump motor, and the outer surface of the sliding shoe part of the product has been surface treated, the coating material is a soft material, and the plunger rod has been anodized, and the outer anodized protective layer is not allowed to be damaged. The lateral requirement of the assembly is 0.04 mm axial gap under 0.5 N action. When this structure is used, a small-diameter elastic bushing 14 and a measurement head mounting seat are selected, the plunger rod is fixed in the elastic bushing 14, and the screw 4 sliding instrument support 5 is adjusted until the plunger assembly sliding shoe seat contacts the base plate 15. The step surface of the sliding shoe is pressed by a pressing plate made of nylon material, the measuring instrument is adjusted and zeroed. The weight of the prescribed force value or the weight of the same weight is prevented on the weight shelf, and the reading of the measuring instrument is observed, which is the axial gap value under the prescribed pulling force. The nylon material pressing plate not only meets the strength requirement, but also will not damage the surface of the sliding shoe.

[0063] In other embodiments of the present application, the measuring device fixes the sliding shoe part of the measured plunger assembly product on the base 1 through the pressing plate 16, connects the measurement head mounting seat 11 and the plunger rod of the measured plunger assembly, connects the instrument contact on the instrument support 5 through one end of the cantilever frame 7, and applies a vertical load to the other end of the cantilever frame 7 to realize the axial pulling force of the plunger assembly, and at the same time, the reading range of the dial gauge fixed on the instrument support 5 is observed to detect whether the axial gap of the plunger assembly meets the requirement.

[0064] The present application solves the problem of measuring the axial gap of the plunger assembly under different pulling forces, and can realize the gap measurement of products of different diameters by replacing the measurement head mounting seat 11 with different inner hole sizes and loading different weights 6. At the same time, the soft material elastic bushing 14 can protect the plunger rod and avoid damage to the appearance.

[0065] In other embodiments of the present application, the measuring device fixes the measured plunger assembly product through the pressing plate 16 to the base 1, connects the measuring head mounting seat 11 with the plunger rod of the measured plunger assembly, connects the one end of the cantilever frame 7 with the instrument contact on the instrument support 5, and applies a vertical load to the other end of the cantilever frame 7 to realize the axial tension of the plunger assembly, and at the same time, the range of the dial gauge fixed on the instrument support 5 is observed to detect whether the axial gap of the plunger assembly meets the requirements. The present application solves the problem of measuring the axial gap of the plunger assembly under different pull-off forces, and can realize the gap measurement of products with different diameters by replacing the measuring head mounting seat 11 with different inner hole sizes and loading different weights 6. At the same time, the soft material physical elastic bushing 14 can protect the plunger rod and avoid appearance damage.

[0066] The present application solves the problem of free sagging of the plunger rod during measurement through the structural design of the measuring rack main body structure, controls the size and direction of the applied force, quantifies the tension value, and realizes one machine with multiple uses and expands the use range of a single structure in mechanical processing measurement through the modular design of the elastic bushing 14 of the measuring head mounting seat 11. The number of high-precision measuring devices is reduced, and a large amount of research and development costs is saved.

Claims

1. A plunger assembly axial clearance measuring device characterized by, The measuring device comprises: a base; a mounting assembly comprising a cantilever frame, the mounting assembly being arranged on the base; a measuring assembly connected to one end of the cantilever frame, the measuring assembly being connected to a cylindrical end of a plunger assembly; wherein the measuring assembly is used to measure the axial clearance of the plunger assembly; a sliding shoe assembled with a spherical head of the plunger assembly; wherein the sliding shoe is fixedly arranged on the base; the mounting assembly comprises: a guide rail frame comprising a U-shaped groove, the guide rail frame being arranged on the base; an instrument support connected to the guide rail frame through the U-shaped groove; wherein the instrument support is movable along the U-shaped groove; the instrument support comprises: an arm comprising a through hole, the arm being used to arrange the measuring assembly; a stand connected to the arm; wherein the cantilever frame is arranged on the stand, and the cantilever frame is rotatable about the stand; the other end of the cantilever frame is provided with a weight.

2. The plunger assembly axial lash measurement device of claim 1, wherein, the measuring assembly comprises: a measuring meter arranged on the arm; wherein the measuring meter comprises a first connecting rod and a second connecting rod, the first connecting rod being connected to one end of the cantilever frame, and the second connecting rod passing through the through hole; a measuring head mounting seat connected to the second connecting rod; wherein the measuring head mounting seat is used to mount the cylindrical end of the plunger assembly.

3. The plunger assembly axial lash measurement device of claim 2, wherein, the measuring head mounting seat comprises: a mounting seat; an elastic bushing arranged in the mounting seat; a first screw used to fix the cylindrical end of the plunger assembly in the mounting seat.

4. The plunger assembly axial lash measuring device of claim 3, wherein, the measuring device further comprises: a pressing plate arranged on the base, the pressing plate being used to fix the sliding shoe; a backing plate arranged between the base and the pressing plate.

5. The plunger assembly axial lash measurement device of claim 4, wherein, the pressing plate comprises: a U-shaped structure used to press the sliding shoe; or, a V-shaped structure used to press the sliding shoe.

6. The plunger assembly axial lash measuring device of claim 5, wherein, the instrument support is in a T-shaped structure; the distance from the weight to the rotation center of the cantilever frame is equal to the distance from the measuring meter to the rotation center of the cantilever frame.

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