CN201575801U - Connecting rod pneumatic comprehensive detection device - Google Patents

Abstract

The utility model discloses a connecting rod pneumatic comprehensive detection device, which comprises a base, on which a base board is arranged, a detection mechanism and a lifting mechanism are respectively arranged on the upper part and the lower part of the base board, and a supporting plate is arranged on the top of the lifting mechanism, and the supporting plate is up and down with the detection device. Sliding fit connection, the detection mechanism includes a large probe and a small probe vertically arranged on the substrate, the large probe and the small probe are both cylindrical structures, and there are several nozzle groups on the circumferential surface of the large probe and the small probe . The utility model adopts the pneumatic measurement method, the large measuring head and the small measuring head in the device convert the change of the part size into the change of the air flow, and the change is indicated by the buoy-type pneumatic measuring instrument connected to it, the operation is simple and reliable, and the detection It has high efficiency and can be placed in the workshop for batch testing of connecting rods. It has strong environmental adaptability and can be widely used in domestic automobiles, motorcycles, and air-conditioning and refrigeration industries, providing reliable testing guarantees for these industries.

Description

Connecting rod pneumatic comprehensive detection device

technical field

The utility model belongs to a precision detection instrument for mechanical parts, in particular to a pneumatic comprehensive detection device for connecting rods.

Background technique

The connecting rod is one of the important parts in the internal combustion engine and the compressor of the cold machine. The large hole in it is connected with the crankshaft of the engine, and the small hole is connected with the piston pin in the piston to transmit power. The items usually required to be tested for connecting rods are: the parallelism between the diameter of the large hole and the prime line; the parallelism between the diameter of the small hole and the prime line; the distance between the centers of the two holes; Parallelism and twist. The current detection device still cannot realize the comprehensive detection of the above items.

For a long time in China, the aperture has been tested with a low-precision general-purpose measuring tool—the inner diameter dial indicator; the method for testing the parallelism and twist of the axis is the "mandrel method". The method is as follows: Insert two mandrels into the two holes of the connecting rod respectively, use a dial gauge to measure and obtain the parallelism and torsion value of the axes of the two holes through conversion. The disadvantages of this traditional detection method are: the detection value cannot be read directly; there are many error links; for example: the matching accuracy of the mandrel and the hole, the roundness of the two mandrels themselves and the parallelism of the plain line; low-precision dial gauge indication etc. lead to extremely low detection accuracy (about a few hundredths of millimeters). Moreover, it is impossible to obtain multiple dimensional detection results in one clamping, and it is impossible to obtain high detection accuracy intuitively and accurately.

There are also manufacturers who use a three-coordinate inspection machine to detect the parallelism and twist of the connecting rod axis. This equipment has high detection accuracy, but it is expensive and requires high environmental conditions. It is not suitable for use in machining sites and cannot be widely used.

Pneumatic detection is a new type of detection technology that my country first introduced from Japan's "Tokyo Precision Co., Ltd." in 1965. It adopts non-contact comparative detection method, uses compressed air as the working medium, converts the size change of the tested part into the change of air flow, and indicates the change amount by the indicating instrument. When the pneumatic detection technology was introduced, it was only a single size detection, such as: aperture; shaft diameter; groove width, etc. The use of this technology for the single complex project parameter detection of connecting rod products and the comprehensive detection of all project parameters has been in the stage of feasibility exploration.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a connecting rod pneumatic comprehensive detection device with high detection precision, many items, high efficiency, low cost and strong environmental adaptability.

In order to solve the above technical problems, the utility model adopts the following technical scheme: the connecting rod pneumatic comprehensive detection device includes a base, the base is provided with a base plate, the upper part and the lower part of the base plate are respectively provided with a detection mechanism and a lifting mechanism, and the top of the lifting mechanism is provided with a supporting plate , the supporting plate is connected with the detection mechanism by sliding up and down.

The detection mechanism includes a large measuring head and a small measuring head vertically arranged on the base plate. The large measuring head and the small measuring head are both cylindrical structures, and several nozzle groups are arranged on the peripheral surfaces of the large measuring head and the small measuring head.

The inside of the base is a hollow structure, and the lifting mechanism includes a lifting cylinder arranged in the base. The piston in the lifting cylinder is connected to the supporting plate through a guide column, and the guide column is slidably connected to the guide sleeve installed on the base plate.

The bottom of the small measuring head is horizontally slidingly matched with the base plate through a slider, the inner side of the slider is connected with a horizontal cylinder, and the outer side of the slider is provided with an axial nozzle.

The tops of the large measuring head and the small measuring head are provided with plastic pads.

Adopt above-mentioned structure, the beneficial effect that reaches is:

1. The connecting rod to be detected is placed on the supporting plate and driven by the lifting mechanism. The detection mechanism used in conjunction with the buoy type pneumatic measuring instrument measures the diameter of the connecting rod, the diameter of the large and small holes and the parallelism of the prime line, the center distance between the two holes, and the two holes. A one-time comprehensive inspection of project parameters such as parallelism and twist of the axis.

2. The large measuring head and the small measuring head are the heart parts of the device, which are pneumatic sensing elements. According to different measuring principles, multiple groups of nozzles are set on the circumferential surface. During the measurement, each nozzle group can send its own measurement signal to the sensor at the same time. The buoy-type pneumatic measuring instrument connected thereafter can indicate the parameter size value of the measured item at one time.

3. The piston in the lifting cylinder is used to push the pallet up and down to pick up and send the measured connecting rod to or leave the measuring station, and its rise and fall are controlled by the foot valve (common part); the high-precision cooperation between the guide cylinder and the guide column improves The up and down movement of the lifting cylinder and the position accuracy of the pallet.

4. The push of the horizontal cylinder The small measuring head set on the slider is for the convenience of placing the workpiece and meeting the requirements of center distance measurement.

5. The plastic pad installed on the large probe and the small probe is to protect the connecting rod under test from bumping.

Using the pneumatic measurement method, the large measuring head and the small measuring head in the device convert the size change of the part into the change of the air flow, and the change is indicated by the buoy type pneumatic measuring instrument connected thereto. This measurement method belongs to non-contact measurement in terms of contact method. There is a gap between the measurement surface and the surface to be measured, which is not easy to scratch the surface to be measured. This measurement method is also a comparative measurement. The measurement can only be carried out after the basic magnification, and the measurement result can be obtained by comparing with the standard part (size transfer reference, equivalent to a block gauge). The utility model has the advantages of novel design, simple structure, high measurement accuracy (total measurement accuracy ≤ 0.002 mm), maximum magnification: ≥ 120% of the basic magnification, variability of indication value: less than one division value of the equipped measuring instrument, simple and reliable operation , High detection efficiency, can be placed in the workshop for batch connecting rod detection, strong environmental adaptability, can be widely used in domestic automobile, motorcycle, air conditioner and refrigerator industries, and provide reliable detection guarantee for these industries.

Description of drawings

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a top view of FIG. 1 .

Detailed ways

As shown in Figure 1 and Figure 2, the connecting rod pneumatic comprehensive detection device of the present utility model includes a base 1, a base plate 2 is provided on the base 1, a detection mechanism and a lifting mechanism are respectively provided on the upper and lower parts of the base plate 2, and a lifting mechanism is provided on the top of the lifting mechanism. There is a supporting plate 3, and the supporting plate 3 is connected with the detection device by sliding up and down. The testing mechanism includes a large measuring head 4 and a small measuring head 5 vertically arranged on the base plate 2 , and a plastic pad 13 and a plastic pad 14 are provided on the top of the large measuring head 4 and the small measuring head 5 respectively. Both the large measuring head 4 and the small measuring head 5 are of cylindrical structure, and the peripheral surfaces of the large measuring head 4 and the small measuring head 5 are respectively provided with several nozzle groups 6 and nozzle groups 16 . The inside of the base 1 is a hollow structure. The lifting mechanism includes a lifting cylinder 7 arranged in the base 1. The piston of the lifting cylinder 7 is connected to the supporting plate 3 through the guide column 8. The guide column 8 is connected to the base through the guide cylinder 9 set outside it. 1 and the base plate 2 are connected with a sliding fit. The small measuring head 4 is fixedly connected by a slider 10 , and the slider 10 is horizontally slidingly matched with the base plate 2 . The inner side of the slider 10 is connected with a horizontal cylinder 11 , and the outer side of the slider 10 is provided with an axial nozzle 12 .

Before work, put the standard connecting rod on the supporting plate 3 to calibrate the basic magnification of the measurement system to the test range, and the parameters of each standard test item are recorded by the buoy type pneumatic measuring instrument. Then carry out the detection of the connecting rod 15 under test. When measuring, step on the foot valve, the compressed air pushes the piston in the lifting cylinder 7 to rise upward, the guide column 8 drives the supporting plate 3 to the top, and the measured connecting rod 15 is placed on the supporting plate 3 and fixed, then loosened The pedal valve, the piston in the lifting cylinder 7, and the guide column 8 drive the supporting plate 3 and the connecting rod 15 to move downward. The two holes of the connecting rod 15 are respectively set on the large measuring head 4 and the small measuring head 5. The nozzle group 6 and the nozzle group 16 on the large probe 4 and the small probe 5 detect items such as the diameter of the two holes, the parallelism of the plain lines of the holes, the parallelism of the axes of the two holes, and the degree of twist. Operate the valve to send air to the horizontal cylinder 11, and the horizontal cylinder 11 pushes the small probe 5 mounted on the slider 10 to drive the tested connecting rod 15 to the axial nozzle 12 for measuring the center distance, between the slider 10 and the axial nozzle 12 The gap is the center distance of the tested connecting rod 15 (the aperture tolerance is negligible compared with the center distance tolerance due to being too small).

Claims (5)

1. the pneumatic comprehensive detection device of connecting rod, it is characterized in that: comprise base, base is provided with substrate, and the substrate upper and lower is respectively equipped with testing agency and elevating mechanism, and the elevating mechanism top is provided with supporting plate, and supporting plate and testing agency slide up and down and are connected.

2. the pneumatic comprehensive detection device of connecting rod according to claim 1, it is characterized in that: described testing agency comprises big gauge head and the little gauge head that is vertically set on the substrate, big gauge head and little gauge head are cylindrical structural, and big gauge head and little gauge head circumferential surface are equipped with several nozzle sets.

3. the pneumatic comprehensive detection device of connecting rod according to claim 1 and 2, it is characterized in that: described base is inner to be hollow structure, elevating mechanism comprises the lift cylinder that is arranged in the base, piston in the lift cylinder is connected with supporting plate by guidepost, guidepost and the orienting sleeve sliding connection that is installed on the substrate.

4. the pneumatic comprehensive detection device of connecting rod according to claim 3 is characterized in that: described little gauge head bottom is connected by slide block and substrate horizontal slip, and the slide block inboard is connected with horizontal air cylinder, and the slide block outside is provided with axial nozzle.

5. the pneumatic comprehensive detection device of connecting rod according to claim 4 is characterized in that: described big gauge head and little gauge head top are equipped with plastic mattress.

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