Piston top detection clamp

Abstract

The invention discloses a piston top detection clamp which comprises a base, a support, a main body, an end face positioning ring, a clamping assembly, an angle positioning assembly and a pneumatic control assembly. The steel piston top is positioned through a spigot formed by combining the outer circle, the top face, the main body and the end face positioning ring, the angular freedom degree is limited through the angle positioning assembly, then pneumatic three-point clamping is conducted through the clamping assembly, and therefore rapid and stable clamping is achieved. The device can ensure that the repeated positioning precision is less than 0.01, has the advantages of high detection efficiency, high positioning precision, compact structure, reliable decompression protection and the like, and is suitable for large-scale detection of the steel piston tops of the engines of the unmanned aerial vehicles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clamps, in particular to a piston top detection clamp. BACKGROUND

[0002] The existing steel piston top detection usually relies on a simple V-block for auxiliary clamping positioning. However, since the outer cylindrical surface of the piston top is usually curved, it is easy to be skewed when placed in the V-groove, resulting in inconsistent selection of workpiece reference, and further causing large fitting error of the overall coordinate system, and significant deviation of the detection result from the true value.

[0003] In addition, the existing method mainly relies on manual operation for angle positioning in the circumferential direction, which has poor repeatability and is prone to misjudgment. During the automatic system building process of the three-coordinate machine, if the workpiece is skewed too much, it will cause program out-of-tolerance, detection failure, and even measurement path interference, causing damage to the measuring needle or displacement of the workpiece, and seriously affecting the detection efficiency and reliability.

[0004] In summary, the existing detection clamping method has the problems of poor positioning accuracy, poor repeatability, low efficiency, and large error, and there is an urgent need for a clamp that can ensure fast and stable clamping of the steel piston top and improve detection accuracy. SUMMARY

[0005] The purpose of the present application is to provide a piston top detection clamp, which realizes fast and reliable clamping of the steel piston top, significantly improves positioning accuracy and detection efficiency, and is suitable for large-scale detection scenarios.

[0006] The present application is implemented by adopting the following technical solutions: a piston top detection clamp, characterized by comprising a base, a bracket, a main body, an end face positioning ring, a clamping assembly, an angle positioning assembly, and a pneumatic control assembly, the clamp is installed on the workbench of a three-coordinate machine as a whole, and is used for positioning and clamping the steel piston top.

[0007] Further, the base is provided with a mounting bottom surface one and a connecting bolt hole one, which are used for positioning and fixing with the workbench of the three-coordinate machine, and the base is provided with a bracket positioning surface two, a bracket positioning surface three, and a bracket connecting bolt hole two, which are used for cooperating with the bracket for assembly.

[0008] Further, the bracket is provided with a mounting reference surface four, a mounting reference surface five, a mounting bolt hole three, a connecting threaded hole one, and a positioning pin hole one, the bracket is fixed with the base through a bolt, and is positioned with the positioning pin hole of the main body through the positioning pin hole one.

[0009] Further, the main body is provided with a clamping assembly installation slot one, a plurality of clamping assemblies are installed, and multi-point clamping of the top end face of the steel piston is realized; the middle part of the main body is provided with a positioning hole one for installing the outer circle of the steel piston top, and the positioning hole one is divided into a plurality of notches three by positioning points for avoiding the measuring needle.

[0010] Further, the end face positioning ring is connected with the connecting bolt hole five of the main body through the threaded hole one, and the end face thereof is matched with the end face of the main body; a plurality of end face positioning points four are arranged on the end face positioning ring, and the top surface of the steel piston top is abutted, and a notch one is arranged, which corresponds to the notch three of the main body, so that the measuring needle enters.

[0011] Further, the clamping assembly comprises a cylinder, a cylinder connecting plate, a cylinder piston rod, a Y-shaped joint, a hinge, a pressing rod and a pressing screw, the cylinder piston rod drives the Y-shaped joint to drive the pressing rod to rotate, so that the pressing screw is driven to realize the pressing or loosening of the steel piston top.

[0012] Further, the angle positioning assembly comprises an angle positioning body, a cylindrical positioning pin and at least two positioning flat pins, the cylindrical positioning pin is inserted into the angle positioning slot one of the main body, and the positioning flat pins are inserted into the positioning holes of the steel piston top, so that the angular positioning is realized.

[0013] Further, the pneumatic control assembly comprises a manual valve, an induced check valve and an air pipe, the manual valve is used for controlling the action of the clamping assembly, and the induced check valve is used for maintaining the state of the clamping assembly when the air source pressure is lost.

[0014] The piston top detection clamp has the following beneficial effects: The present application adopts the combination positioning of the outer circle, the end face and the positioning hole, limits the six degrees of freedom of the workpiece, has high positioning accuracy, and the repeat positioning accuracy can be controlled within 0.01. The present application realizes rapid and stable clamping through three-point pneumatic clamping, and the clamping efficiency is significantly improved, which is suitable for batch detection in the production line. The present application does not set a shielding structure at the positioning position of the workpiece end face and the outer circle, and the three-coordinate machine measuring needle can collect the measuring points without obstacles, avoiding the shielding problem of the traditional clamp. The present application is equipped with air source pressure loss protection function, when the air source pressure is reduced or interrupted, the clamping assembly can still maintain the original state, preventing the workpiece from falling or damaging the measuring needle. Compared with the traditional V-shaped block positioning, the present application reduces the repeated alignment process, avoids the detection error caused by deflection, and improves the detection accuracy and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without any creative labor for those skilled in the art.

[0016] Figure 1 It is an exploded view of a piston top detection clamp structure. Figure 2 It is a base schematic view. Figure 3 It is a support schematic view. Figure 4 It is a main body schematic view. Figure 5 It is an end face positioning ring schematic view. Figure 6 It is a clamping assembly schematic view. Figure 7 It is an angle positioning assembly schematic view. Figure 8 It is a pneumatic control assembly schematic view. In the drawings, 1 is a base; 1.1 is a mounting bottom surface one; 1.2 is a connecting bolt hole one; 1.3 is a support positioning surface two; 1.4 is a support positioning surface three; 1.5 is a support connecting bolt hole two; 2 is a support; 2.1 is a mounting reference surface four; 2.2 is a mounting reference surface five; 2.3 is a mounting bolt hole three; 2.4 is a connecting threaded hole one; 2.5 is a positioning pin hole one; 2.6 is a connecting bolt hole four; 2.7 is a clamping assembly mounting avoidance groove one; 3 is a main body; 3.1 is a connecting threaded hole two; 3.2 is a connecting threaded hole three; 3.3 is a positioning pin hole two; 3.4 is a positioning pin hole three; 3.5 is a clamping assembly mounting groove one; 3.6 is a positioning hole one; 3.7 is a positioning point; 3.8 is a notch three; 3.9 is an angle positioning groove one; 3.10 is a connecting bolt hole five; 4 is an end face positioning ring; 4.1 is a threaded hole one; 4.3 is an end face positioning point four; 4.4 is a notch one; 5 is a clamping assembly; 5.1 is a cylinder; 5.2 is a cylinder connecting plate; 5.3 is a cylinder piston rod; 5.4 is a hinge shaft one; 5.5 is a Y-shaped joint; 5.6 is a hinge shaft two; 5.7 is a hinge; 5.8 is a hinge shaft three; 5.9 is a pressing rod; 5.10 is a pressing screw; 5.11 is a screw; 5.12 is a screw; 6 is an angle positioning assembly; 6.1 is a cylindrical positioning pin; 6.2 is an angle positioning body; 6.3 is a positioning flat pin one; 6.4 is a positioning flat pin two; 7 is a pneumatic control assembly; 7.1 is a manual valve; 7.2 is an induced check valve; 7.3 is a gas pipe; 8 is a steel piston top. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. Example

[0019] like Figure 1 As shown, this embodiment provides a piston top inspection fixture, including a base 1, a bracket 2, a main body 3, an end face positioning ring 4, a clamping assembly 5, an angle positioning assembly 6, and a pneumatic control assembly 7. The fixture is mounted on the worktable of a coordinate measuring machine for high-precision positioning and clamping of the steel piston top 8 to meet batch inspection requirements.

[0020] The base 1 serves as the basic component of the fixture. Its lower part is provided with a mounting surface 1.1 for positioning with the worktable of the coordinate measuring machine and for fastening through the connecting bolt hole 1.2. On it are formed a bracket positioning surface 1.3, a bracket positioning surface 1.4, and a bracket connecting bolt hole 1.5 for assembly with the bracket 2.

[0021] The bracket 2 mates with the positioning surfaces 1.3 and 1.4 of the base 1 via mounting reference surfaces 2.1 and 2.2, and is fixed to the base 1 via mounting bolt holes 2.3 and threaded holes 2.4. The bracket 2 also has a positioning pin hole 2.5 for mates with the positioning pin hole of the main body 3; a connecting bolt hole 2.6 for screwing and fixing to the main body 3; and a clamping assembly mounting clearance groove 2.7 to provide installation space for the clamping assembly 5.

[0022] The main body 3 is fixed to the bracket 2 via connecting threaded holes 3.1 and 3.2. Positioning pin holes 3.3 and 3.4 engage with positioning pin holes 2.5 on the bracket 2, and cylindrical pins are installed to limit the relative position of the main body 3 and the bracket 2, ensuring positional accuracy. The main body 3 has three clamping component mounting slots 3.5, each for mounting three sets of clamping components 5, achieving three-point clamping of the steel piston top 8 end face.

[0023] The middle part of the main body 3 is provided with a positioning hole 3.6 for installing the outer circle of the steel piston top 8, the hole body is divided into four sections by four positioning points 3.7, and a notch 3.8 is formed to enable the measuring needle to smoothly enter the sampling point. The main body 3 is also provided with an angle positioning groove 3.9 for inserting the cylindrical positioning pin 6.1 of the angle positioning assembly 6 to achieve angular positioning.

[0024] The end face positioning ring 4 is fixed with the connecting bolt hole five 3.10 of the main body 3 through the threaded hole 4.1, and the end face thereof cooperates with the end face of the main body 3. Four end face positioning points four 4.3 are arranged on the ring body and abut against the top surface of the steel piston top 8 for further limiting the freedom degree of the workpiece; meanwhile, four notches 4.4 are arranged and correspond to the notches three 3.8 of the main body 3 to provide a space for the measuring needle.

[0025] The clamping assembly 5 is installed in the groove 3.5 of the main body 3. It includes a gas cylinder 5.1, a gas cylinder connecting plate 5.2, a gas cylinder piston rod 5.3, a Y-shaped joint 5.5, a hinge 5.7, a pressing rod 5.9, and a pressing screw 5.10. When working, the gas cylinder piston rod 5.3 pushes the Y-shaped joint 5.5 to move axially, drives the pressing rod 5.9 to rotate around the hinge, and makes the pressing screw 5.10 press or loosen the end face of the steel piston top 8. The three sets of clamping assemblies 5 are evenly distributed in the circumferential direction to ensure that the end face is balanced in force. The gas cylinder 5.1 is fixed on the gas cylinder connecting plate 5.2 by a screw 5.11, the gas cylinder piston rod 5.3 on the gas cylinder 5.1 is installed with the Y-shaped joint 5.5, the Y-shaped joint 5.5 is connected with the pressing rod 5.9 through the hinge shaft two 5.6 to form a rotating pair; the pressing rod 5.9 is connected with the hinge 5.7 through the hinge shaft three 5.8 to form a rotating pair; the hinge 5.7 is connected with the gas cylinder connecting plate 5.2 through the hinge shaft one 5.4 to form a rotating pair; the pressing screw 5.10 is installed on the pressing rod 5.9 through a thread, when the gas cylinder piston rod 5.3 moves axially, it pushes the Y-shaped joint 5.5 to move axially, makes the pressing rod 5.9 rotate forward or backward around the hinge shaft three 5.8, and realizes pressing or loosening the steel piston top 8.

[0026] The angle positioning assembly 6 includes an angle positioning body 6.2, a cylindrical positioning pin 6.1, and positioning flat pins 6.3 and 6.4. During clamping, the cylindrical positioning pin 6.1 is inserted into the angle positioning groove one 3.9 of the main body 3, and the positioning flat pin one 6.3 and the positioning flat pin two 6.4 are inserted into the positioning hole of the steel piston top 8, thereby realizing the limitation of the workpiece in the angular direction. After clamping is completed, the assembly can be removed without affecting detection.

[0027] The pneumatic control assembly 7 includes a manual valve 7.1, an induced check valve 7.2, and a gas pipe 7.3. The manual valve 7.1 is a five-port three-position central closed type for controlling the action of the gas cylinder; the induced check valve 7.2 is used to maintain the state of the gas cylinder when the gas source loses pressure to avoid the workpiece from falling; the gas pipe 7.3 and the standard pipe joint form a complete gas path to control the clamping action of the clamping assembly 5.

[0028] In use, first, the steel piston top 8 is placed in the mouth formed by the main body 3 and the end face positioning ring 4, the outer circle and the top surface thereof serve as a reference surface to limit five degrees of freedom; the sixth degree of freedom is limited by the angle positioning assembly 6. Then, the manual valve 7.1 is operated to actuate the clamping assembly 5 to press the end face of the workpiece, and clamping is completed; after clamping, the angle positioning assembly 6 is removed, and detection can be performed. After detection is completed, the manual valve 7.1 is operated again, the clamping assembly 5 is loosened, and the workpiece can be removed.

[0029] In the embodiment, the workpiece is quickly and stably clamped by combined positioning of the outer circle, the end face and the positioning hole and three-point clamping by a pneumatic device, the repeated positioning precision is controlled within 0.01, the outer circle and the end face of the workpiece are fully exposed, and the three-coordinate machine measuring needle can be detected without obstacles; the clamp also has a pressure loss protection function of a gas source, so that the workpiece is prevented from falling or damaging the measuring needle. Compared with the traditional V-block clamping, the embodiment significantly improves the detection efficiency and reliability, and is suitable for mass detection in a production line.

[0030] In the above embodiments, the basic principles and main features of the present application and the advantages of the present application are described. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application should be within the protection scope of the claims of the present application.

Claims

1. A piston top detection fixture, characterized in that, The fixture includes a base (1), a bracket (2), a main body (3), an end face positioning ring (4), a clamping assembly (5), an angle positioning assembly (6), and a pneumatic control assembly (7). The fixture is installed on the worktable of a coordinate measuring machine and is used to position and clamp the steel piston top (8).

2. The piston top detection fixture according to claim 1, characterized in that, The base (1) is provided with a mounting bottom surface (1.1) and a connecting bolt hole (1.2) for positioning and fixing with the worktable of the coordinate measuring machine. The base (1) is provided with a bracket positioning surface (1.3), a bracket positioning surface (1.4) and a bracket connecting bolt hole (1.5) for assembling with the bracket (2).

3. A piston top detection fixture according to claim 1, characterized in that, The bracket (2) is provided with mounting reference surface four (2.1), mounting reference surface five (2.2), mounting bolt hole three (2.3), connecting thread hole one (2.4) and positioning pin hole one (2.5). The bracket (2) is fixed to the base (1) by bolts, and is positioned by the positioning pin hole one (2.5) cooperating with the positioning pin hole of the main body (3).

4. A piston top detection fixture according to claim 1, characterized in that, The main body (3) is provided with a clamping component mounting groove (3.5) and multiple clamping components (5) are installed to achieve multi-point clamping of the end face of the steel piston top (8); the main body (3) is provided with a positioning hole (3.6) in the middle for installing the outer circle of the steel piston top (8), and the positioning hole (3.6) is divided by the positioning point (3.7) to form multiple notches (3.8) for probe avoidance.

5. A piston top detection fixture according to claim 4, characterized in that, The end face positioning ring (4) is connected to the connecting bolt hole five (3.10) of the main body (3) through the threaded hole one (4.1), and its end face is matched with the end face of the main body (3); the end face positioning ring (4) is provided with multiple end face positioning points four (4.3), which abut against the top surface of the steel piston top (8), and is provided with notch one (4.4), which corresponds to notch three (3.8) of the main body (3) so that the probe can enter.

6. A piston top detection fixture according to claim 1, characterized in that, The clamping assembly (5) includes a cylinder (5.1), a cylinder connecting plate (5.2), a cylinder piston rod (5.3), a Y-shaped connector (5.5), a hinge (5.7), a pressure rod (5.9), and a clamping screw (5.10). The cylinder piston rod (5.3) pushes the Y-shaped connector (5.5) to drive the pressure rod (5.9) to rotate, thereby driving the clamping screw (5.10) to clamp or loosen the steel piston top (8).

7. A piston top detection fixture according to claim 4, characterized in that, The angle positioning component (6) includes an angle positioning body (6.2), a cylindrical positioning pin (6.1), and at least two positioning flat pins. The cylindrical positioning pin (6.1) is inserted into the angle positioning groove (3.9) of the main body (3), and the positioning flat pin is inserted into the positioning hole of the steel piston top (8) to achieve angular positioning.

8. A piston top detection fixture according to any one of claims 1, characterized in that, The pneumatic control assembly (7) includes a manual valve (7.1), an induction check valve (7.2), and an air pipe (7.3). The manual valve (7.1) is used to control the action of the clamping assembly (5), and the induction check valve (7.2) is used to maintain the state of the clamping assembly (5) when the air source is depressurized.

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