A plunger center hole coaxial degree testing fixture

Abstract

This utility model relates to the field of plunger-related technology and discloses a plunger center hole coaxiality gauge, including a base; front and rear opposing support legs are provided on the upper part of the base, and a V-shaped plate is provided on the upper end of the support legs; a left-right groove is provided in the middle of the upper part of the base, and a bidirectional screw is provided in the groove. One end of the bidirectional screw extends out of the base and is connected to a motor. Opposing movable plates are threadedly sleeved on the side wall of the bidirectional screw, and the upper end of the movable plates extends above the V-shaped plate. A connecting plate is slidably sleeved on the movable plates. One connecting plate has a frustum-shaped tip on the side wall facing the V-shaped plate, and the other connecting plate has a dial indicator. The measuring head of the dial indicator is horizontally facing the center of the base; a left-right pressure roller is provided above the V-shaped plate, and a second motor is driven to one end of the pressure roller. The other end of the second motor has a support plate that can slide up and down. The advantages of this utility model compared with the prior art are: reduced detection deviation and high detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of plunger-related technology, specifically to a plunger center hole coaxiality inspection tool. Background Technology

[0002] A plunger is a high-precision cylindrical functional component whose core function is to change the volume of the working chamber through reciprocating or rotary motion, thereby enabling the intake, compression, and discharge of fluids (liquids / gases) or the transmission of power. It is widely used in hydraulic systems, internal combustion engines, pneumatic equipment, and other fields.

[0003] The plunger center bore coaxiality gauge is a specialized measuring tool used to detect the coaxiality error between the center holes at both ends of the plunger and the reference axis. This allows for the screening of parts with out-of-tolerance coaxiality, ensuring subsequent assembly accuracy and equipment operational stability. The coaxiality gauge mainly consists of a reference positioning component and a measuring component. The reference positioning component typically uses a V-block to support the outer circle and determine the reference through the outer circle's axis. The measuring component typically uses a dial indicator to contact the surface of the workpiece, and the radial deviation is reflected by the pointer's movement.

[0004] During the specific inspection, place the plunger on the V-block, lightly touch the measuring head of the dial indicator to the key surface of the part being tested, manually rotate the part one revolution, and observe the maximum swing value of the dial indicator pointer. If the measured value is less than or equal to the tolerance value, the part is qualified; if the measured value is greater than the tolerance value, the part is unqualified and needs to be returned to the processing stage for correction.

[0005] Therefore, the following shortcomings exist when using it:

[0006] 1. The reference axis depends on the cylindricity of the outer circle of the plunger. If there is a roundness error in the outer circle, the V-block will misjudge the shape error of the outer circle as the reference axis deviation, which will cause the "reference offset" of the subsequent coaxiality measurement and directly affect the detection accuracy.

[0007] 2. Relying on manual rotation of the plunger for one revolution results in inconsistent rotation speed and force, which can cause the dial indicator pointer to respond sluggishly or swing excessively, making it difficult to capture the true maximum deviation. Utility Model Content

[0008] I. Technical problems to be solved

[0009] The technical problem this invention aims to solve is that deviations in the outer diameter of the plunger can affect detection accuracy, and manual rotation can easily affect detection accuracy.

[0010] II. Technical Solution

[0011] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a plunger center hole coaxiality gauge, including a base;

[0012] The base has front and rear opposing support legs on top, and a V-shaped plate on the upper end of each support leg. The base has a left and right groove in the middle of the upper part, and a bidirectional screw is installed in the groove. One end of the bidirectional screw extends out of the base and is connected to a motor. Opposing moving plates are threaded onto the side wall of the bidirectional screw. The upper end of the moving plates extends above the V-shaped plate. A connecting plate is slidably sleeved on the moving plates. One of the connecting plates has a frustum-shaped tip on the side wall facing the V-shaped plate, and the other connecting plate has a dial indicator. The measuring head of the dial indicator is horizontally oriented towards the center of the base.

[0013] The V-shaped plate is equipped with left and right pressure rollers above it. One end of the pressure rollers is connected to a second motor, and the other end of the second motor is equipped with a support plate that can slide up and down.

[0014] As an improvement, a T-shaped groove is provided above the movable plate. The vertical end of the T-shaped groove faces the V-shaped plate horizontally and extends out of the movable plate. The connecting plate includes a T-shaped plate that slides vertically and is inserted into the T-shaped groove. The side wall of the T-shaped plate outside the T-shaped groove is connected to a connecting frame that is attached to the outer wall of the movable plate. The horizontal end of the T-shaped plate is connected to a center and a dial indicator respectively. The end of the connecting frame away from the V-shaped plate is threaded with a limit bolt.

[0015] As an improvement, the lower end of the T-groove is located below the inner wall of the bottom of the V-shaped plate.

[0016] As an improvement, the sidewall of the pressure roller is provided with multiple anti-slip patterns evenly distributed along the circumferential direction, and the anti-slip patterns have a wave-shaped structure.

[0017] As an improvement, the base is provided with a front-to-back connecting frame, the support plate is in the shape of an inverted U, and both ends are inserted into the connecting frame respectively. The front connecting frame is threaded with a limiting bolt that abuts against the support plate.

[0018] As an improvement, the front side of the connecting frame located on the front side is provided with multiple internal threaded through holes evenly arranged vertically, and the two threads of the limiting bolt pass through the internal threaded through holes and abut against the support plate.

[0019] III. Beneficial Effects

[0020] The advantages of this utility model compared with the prior art are as follows:

[0021] 1. This utility model provides stable support for the outer circle of the plunger by setting a movable frustum-shaped tip in conjunction with a V-shaped plate. During testing, the tip is directly inserted into the center hole at one end of the plunger, and a dial indicator that can move up and down is set at the other end. This allows for the measurement of whether the roundness of the inner and outer walls of the plunger is qualified, thus ensuring the accuracy of the test.

[0022] 2. This utility model uses a motor to drive the pressure roller to rotate the plunger. The pressure roller and the V-shaped plate cooperate to form an upper and lower clamp, which can drive the plunger to rotate synchronously, replacing manual operation. In addition, the side wall of the pressure roller is evenly decorated with wavy anti-slip texture along the circumference, which greatly increases the friction between the pressure roller and the outer circle of the plunger, avoids slippage during rotation, and ensures that the plunger always rotates at a constant speed, making the test results more accurate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a plunger center hole coaxiality inspection tool according to the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a plunger center hole coaxiality inspection tool according to this utility model. Figure 2 .

[0025] Figure 3 This is an exploded view of a plunger center hole coaxiality gauge according to this utility model.

[0026] Figure 4 This utility model relates to an explosive method for inspecting the coaxiality of a plunger's center hole. Figure 2 .

[0027] As shown in the figure: 1. Base; 2. Support leg; 3. V-shaped plate; 4. Groove; 5. Bidirectional screw; 6. Motor; 7. Moving plate; 8. Connecting plate; 9. Center; 10. Dial indicator; 11. Pressure roller; 12. Motor II; 13. Support plate; 14. T-slot; 15. Limiting bolt; 16. Anti-slip texture; 17. Connecting frame; 18. Limiting bolt II; 19. Internal threaded through hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] As attached Figure 1-4As shown, a plunger center hole coaxiality gauge includes a base 1, with opposing support legs 2 on the top of the base 1. A V-shaped plate 3 is provided at the upper end of each support leg 2. A left-right groove 4 is provided in the middle of the upper part of the base 1, and a bidirectional screw 5 is provided within the groove 4. One end of the bidirectional screw 5 extends out of the base 1 and is connected to a motor 6. Opposite moving plates 7 are threaded onto the sidewall of the bidirectional screw 5. After starting the motor 6, the bidirectional screw 5 rotates, which can drive the moving plates 7 to move synchronously towards or away from the V-shaped plate 3, so as to place plungers of different sizes and lengths on the V-shaped plate 3. The upper end of the moving plate 7 extends above the V-shaped plate 3, and a connecting plate 8 is slidably sleeved on the moving plate 7. One connecting plate 8 has a frustum-shaped tip 9 facing the sidewall of the V-shaped plate 3, and the other connecting plate 8 has a dial indicator 10. A T-shaped groove 14 is provided above the moving plate 7, with one vertical end of the T-shaped groove 14 horizontally facing the V-shaped plate 3 and extending outwards. Plate 7, the connecting plate 8 includes a T-shaped plate that slides vertically into the T-groove 14. The side wall of the T-shaped plate outside the T-groove 14 is connected to a connecting frame that adheres to the outer wall of the movable plate 7. A limiting bolt 15 is threaded into the end of the connecting frame away from the V-shaped plate 3, so that the T-shaped plate of the connecting plate 8 is inserted into the T-groove 14, and the connecting frame is sleeved on the outside of the movable plate 7. The limiting bolt 15 is inserted to hold the movable plate 7 in place, fixing the position of the connecting plate 8. The horizontal end of the T-shaped plate is connected to the top... The tip 9 and dial indicator 10 are positioned with the measuring head of dial indicator 10 horizontally facing the center of base 1, allowing the heights of tip 9 and dial indicator 10 to be adjusted separately. The movable frustum-shaped tip 9, in conjunction with the V-shaped plate 3, provides stable support for the outer circle of the plunger. The tip is directly inserted into the center hole at one end of the plunger, while the dial indicator 10, which can move up and down at the other end, is in contact with the outer or inner wall of the plunger. By rotating the plunger, the swing value of the pointer of dial indicator 10 can be used to determine whether the roundness of the inner and outer walls of the plunger is qualified, thus ensuring the accuracy of the test.

[0030] Furthermore, the lower end of the T-groove 14 is located below the bottom inner wall of the V-shaped plate 3, so that the connecting plate 8 can be moved to correspond to the center of any size plunger placed on the V-shaped plate 3.

[0031] The V-shaped plate 3 is provided with left and right pressure rollers 11 above it. One end of the pressure roller 11 is connected to a motor 12, and the other end of the motor 12 is provided with a support plate 13 that can slide up and down. The base 1 is provided with front and rear opposing connecting frames 17 above it. The support plate 13 has an inverted U-shaped structure, and its two ends are respectively inserted into the connecting frames 17. The front side of the connecting frame 17 is threaded with a limiting bolt 18 that abuts against the support plate 13, so that the support plate 13 can slide up and down within the connecting frame 17. By tightening the limiting bolt, the support plate 13 can slide up and down. Bolt 2 18 fixes the position of support plate 13, that is, fixes the position of pressure roller 11. Pressure roller 11 and V-shaped plate 3 cooperate to form upper and lower clamping. Pressure roller 11 is in contact with plunger. Motor 2 12 drives pressure roller 11, which can drive plunger to rotate synchronously, replacing manual operation. The side wall of pressure roller 11 is evenly provided with multiple anti-slip textures 16 along the circumferential direction. The anti-slip textures 16 have a wave-shaped structure, which can greatly increase the friction between pressure roller 11 and outer circle of plunger, avoid slippage during rotation, and ensure that plunger always rotates at a constant speed, making the test results more accurate.

[0032] Furthermore, the front side of the connecting frame 17 is provided with a plurality of internal threaded through holes 19 evenly arranged vertically. The threaded limit bolts 18 pass through the internal threaded through holes 19 and abut against the support plate 13. The multiple limit bolts 18 can be rotatably inserted to stabilize and fix the position of the support plate 13.

[0033] It is worth noting that the power supply and control switch of the electrically driven component mentioned in this embodiment can also be provided by the manufacturer. The circuits, electronic components and modules involved are all existing technologies. They can be connected to the external power supply by wired means, which are existing methods and will not be described in detail. Those skilled in the art can fully implement them without further explanation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A plunger center hole coaxiality gauge, comprising a base (1), characterized in that: The base (1) is provided with front and rear opposing support legs (2) on the top. The upper end of the support leg (2) is provided with a V-shaped plate (3). The middle part of the base (1) is provided with a left and right groove (4). The groove (4) is provided with a bidirectional screw (5). One end of the bidirectional screw (5) extends out of the base (1) and is connected to a motor (6). The side wall of the bidirectional screw (5) is threaded with opposing moving plates (7). The upper end of the moving plate (7) extends above the V-shaped plate (3). The moving plate (7) is slidably sleeved with a connecting plate (8). One of the connecting plates (8) is provided with a frustum-shaped tip (9) facing the side wall of the V-shaped plate (3). The other connecting plate (8) is provided with a dial indicator (10). The measuring head of the dial indicator (10) is horizontally facing the center of the base (1). The V-shaped plate (3) is provided with a left-right pressure roller (11) above it. One end of the pressure roller (11) is connected to a motor (12), and the other end of the motor (12) is provided with a support plate (13) that can slide up and down.

2. A bore concentricity gauge for a plunger according to claim 1, wherein: The movable plate (7) is provided with a T-shaped groove (14) above it. The vertical end of the T-shaped groove (14) is horizontally oriented towards the V-shaped plate (3) and extends out of the movable plate (7). The connecting plate (8) includes a T-shaped plate that slides and inserts into the T-shaped groove (14). The side wall of the T-shaped plate located outside the T-shaped groove (14) is connected to a connecting frame that is attached to the outer wall of the movable plate (7). The horizontal end of the T-shaped plate is connected to a center point (9) and a dial indicator (10). The end of the connecting frame away from the V-shaped plate (3) is threaded with a limit bolt (15).

3. A bore concentricity gauge for a plunger according to claim 2, wherein: The lower end of the T-groove (14) is located below the bottom inner wall of the V-shaped plate (3).

4. A bore concentricity gauge for a plunger according to claim 1, wherein: The sidewall of the pressure roller (11) is uniformly provided with multiple anti-slip patterns (16) along the circumferential direction, and the anti-slip patterns (16) have a wave-shaped structure.

5. A bore concentricity gauge for a plunger as defined in claim 1, wherein: The base (1) is provided with a front-to-back connecting frame (17) above it. The support plate (13) has an inverted U-shaped structure and its two ends are respectively inserted into the connecting frame (17). The front side of the connecting frame (17) is threaded with a limiting bolt (18) that abuts against the support plate (13).

6. A bore concentricity gauge for a plunger according to claim 5, wherein: The connecting frame (17) located on the front side has multiple internal threaded through holes (19) evenly arranged vertically on the front side. The threaded limit bolt (18) passes through the internal threaded through hole (19) and abuts against the support plate (13).

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