Size detection device for sand outlet hole of engine cylinder cover

Abstract

An engine cylinder cover sand outlet hole size detection device is characterized in that a mounting frame in sliding fit with a guide rail is provided with a measuring head mounting seat, an air inlet hole in the measuring head mounting seat is connected with an air outlet end of a pneumatic measuring instrument host, and a shaft core of a shaft-shaped pneumatic measuring head on the measuring head mounting seat is parallel to the slide rail; the air inlet is communicated with the air outlet on the arc surface of the pneumatic measuring head. After the detection device is arranged at the working position, the pneumatic measuring head can directionally move along the guide rail and can be quickly guided into the corresponding plug hole when the cylinder cover to be detected moves to the detection position so as to measure the hole diameter. The pneumatic detection result is more accurate, meanwhile, the specific size value can be rapidly displayed through the pneumatic measuring instrument host, whether the plug hole size is qualified or not can be conveniently and rapidly judged, and the detection efficiency is effectively improved and the operation pressure is small under the condition that the detection result is accurate.

Description

Technical Field

[0001] The utility model patent relates to engine cylinder head detection, and specifically to a device for detecting the size of sand holes in an engine cylinder head. Background Art

[0002] The engine cylinder head is one of the three major parts of the engine. It plays an important role in the engine's valve timing, ignition, fuel injection, and the formation of the combustion chamber. It has very complex cooling water channels inside. When casting the cylinder head, it is necessary to fill the mold with casting sand in the mold according to the prescribed path to reserve the water channel path to form the later cylinder head water channel. At the same time, a sand outlet hole, also known as a bowl-shaped plug hole, which is connected to the water channel, will be reserved on the cylinder head to discharge the casting sand in the water channel after the cylinder head is formed. After the initial mold of the cylinder head is formed, it needs to be further processed, and the plug hole also needs to be chipped to the appropriate size, and then the corresponding bowl-shaped plug is pressed to close the plug hole so that the antifreeze added to the water channel will not leak from the plug hole.

[0003] When the plug hole is machined, its size will change. If it is too large or too small, it will cause the bowl-shaped plug to produce false pressure or insufficient depth after pressing. In actual application, when the antifreeze circulates inside the water channel of the engine cylinder head or high temperature and high pressure occur, the bowl-shaped plug will easily fall off under the action of pressure, causing the engine antifreeze to leak, and even cause major engine failure. Therefore, in the production process of the engine cylinder head, it is essential to detect the size of the plug hole after processing. However, at present, manual measurement is generally used for the size detection of the plug hole, that is, the worker takes the corresponding measuring tool (such as a vernier caliper) to manually measure the plug hole, and the measurement result is not accurate enough. Moreover, the engine production of the main engine factory in the industry is a large-scale assembly line production, and there are many cylinder head plug holes that need to be detected. Not only is the detection efficiency slow, but the manual detection operation pressure is also high. Over a long period of time, affected by subjective factors such as physical fatigue of workers, the plug hole detection results cannot be effectively guaranteed, and the plug hole size detection lacks effective prevention and control measures. Summary of the invention

[0004] The utility model provides a device for detecting the size of sand holes in an engine cylinder head, which improves the problem of low efficiency and poor accuracy in measuring the plug holes in the cylinder head by using a traditional manual handheld measuring tool.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted is: a device for detecting the size of sand holes in an engine cylinder head, a probe mounting seat is provided on a mounting frame that slides with a guide rail, the air inlet hole on the probe mounting seat is connected to the air outlet end of the pneumatic measuring instrument host, the axis core of the axial pneumatic measuring head on the probe mounting seat is parallel to the slide rail, and the air inlet hole is connected to the air outlet hole on the arc surface of the pneumatic measuring head.

[0006] Compared with the prior art, the technical effect of the utility model is as follows: after the detection device is arranged at the working position, the pneumatic measuring head can be directional moved along the guide rail, and can be quickly introduced into the corresponding plug hole when the cylinder head to be detected moves to the detection position to measure the aperture. The pneumatic detection result is more accurate, and the specific size value can be quickly displayed through the pneumatic measuring instrument host, which is convenient for quickly judging whether the plug hole size is qualified and, while ensuring the accuracy of the detection result, the detection efficiency is effectively improved and the operating pressure is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0008] Figure 2 This is a schematic diagram of the connection between the probe mounting base and the pneumatic measuring instrument host;

[0009] Figure 3 It is a schematic diagram of the connection between the docking rod and the mounting frame;

[0010] Figure 4 for Figure 1 A-direction view in the figure;

[0011] Figure 5 It is a schematic diagram of the rear axle;

[0012] Figure 6 The schematic diagram of spring arrangement is shown in Figure 1.

[0013] Figure 7 Schematic diagram of the connection between the push-pull rod and the docking rod. DETAILED DESCRIPTION

[0014] The following is combined with Figure 1-7 And related content, the utility model is further described in detail:

[0015] A device for detecting the size of sand holes in an engine cylinder head is provided. A probe mounting seat 61 is provided on a mounting frame 30 that slides with a guide rail 20. An air inlet 66 on the probe mounting seat 61 is connected to an air outlet end of a pneumatic measuring instrument host 80. The axis core of an axial pneumatic measuring head 60 on the probe mounting seat 61 is parallel to the slide rail 20, and the air inlet 66 is communicated with an air outlet 68 on the arc surface of the pneumatic measuring head 60.

[0016] In the above scheme, after the detection device is arranged at the working position, the pneumatic measuring head 60 can be directional moved along the guide rail 20. After the cylinder head to be detected is moved to the detection position through the lifting mechanism or the translation mechanism, the pneumatic measuring head 60 can be quickly introduced into the corresponding cylinder head plug hole to measure the aperture. By using the corresponding change relationship between air pressure and pore, the air pressure size of the pore when the pneumatic measuring head 60 is plugged into the plug hole is converted into the corresponding aperture value, and displayed on the pneumatic measuring instrument host 80, which is convenient for quickly judging whether the plug hole size is qualified and ensuring the accuracy of the detection result, the detection efficiency is effectively improved and the working pressure is low.

[0017] Furthermore, the joint structure formed by the probe mounting seat 61 and the pneumatic measuring head 60 forms a radial floating and axial limiting fit with the mounting frame 30. Even if there is a certain error in the concentricity between the position of the cylinder head plug hole and the pneumatic measuring head 60, resulting in misalignment, the pneumatic measuring head 60 can be introduced into the cylinder head plug hole by utilizing the radial floating of the probe mounting seat 61 and the pneumatic measuring head 60. The position deviation of the pneumatic measuring head 60 and the plug hole on the concentricity can be corrected, thereby improving fault tolerance. In addition, under the action of air pressure, an annular air sleeve can be constructed between the pneumatic measuring head 60 and the plug hole and present a suspended state, thereby minimizing the friction between the pneumatic measuring head 60 and the hole wall, realizing non-contact and scratch-free measurement, and avoiding scratching the inner wall of the plug hole during measurement.

[0018] As a preferred solution, a rear shaft 64 is provided on the rear end face of the probe mounting seat 61, and the rear shaft 64 is coaxially arranged with the pneumatic measuring head 60. A circumferentially arranged annular flange 641 is provided on the shaft body of the rear shaft 64. The inner ring of the annular plate 621 is clamped in the annular groove between the annular flange 641 and the rear end face of the probe mounting seat 61 to form a radial sliding and axial limiting fit. The inner ring aperture of the annular plate 621 is larger than the diameter of the rear shaft 64. The barrel mouth of the cylindrical shell-shaped base 62 is detachably connected to the plate edge of the annular plate 621. A spring 65 is arranged between the base 62 and the shaft body of the rear shaft 64. The elastic force provided by the spring 65 acts on the rear shaft 64 in the radial direction.

[0019] In this solution, the rear shaft 64 connected to the probe mounting seat 61 is built into the inner cavity 63 of the base 62, and the rear shaft 64 can move in the inner hole of the annular plate 621. Through the radial sliding and axial limiting cooperation formed by the annular flange 641 and the rear end face of the probe mounting seat 61 on the annular plate 621, the joint structure formed by the probe mounting seat 61, the pneumatic measuring head 60 and the rear shaft 64 can float radially under the elastic force of the spring 65, so that the pneumatic measuring head 60 can float and adjust the position, avoiding the phenomenon of rigid extrusion between the two during the process of inserting the pneumatic measuring head 60 into the plug hole of the cylinder head, protecting the integrity of the pneumatic measuring head 60 on the one hand, and protecting the integrity of the hole wall of the plug hole of the cylinder head on the other hand.

[0020] Furthermore, the edge of the suspended end of the pneumatic measuring head 60 is provided with a circular chamfer 67. In the case where there is a certain process deviation between the pneumatic measuring head 60 and the plug hole, the setting of the circular chamfer 67 can guide the transition of the front edge position of the pneumatic measuring head 60 and the edge of the plug hole, and cooperate with the floating of the pneumatic measuring head 60 to guide the pneumatic measuring head 60 into the plug hole.

[0021] As a preferred solution, a driving unit 50 composed of a pneumatic cylinder, an oil cylinder or an electric cylinder is arranged on the stand 10 connected to the guide rail 20 to drive the mounting frame 30 to slide along the guide rail 20. The driving unit 50 is used to drive the pneumatic measuring head 60 into the plug hole of the cylinder head, and the standard assembly line operation is cooperated to realize the automated, unmanned and standardized inspection operation.

[0022] As a preferred solution, the front end of the docking rod 70 has a flange 71 which is detachably connected to the rear side panel of the mounting frame 30, and the rear end of the docking rod 70 has a closed T-shaped slot 72, and the slot length direction of the T-shaped slot 72 is perpendicular to the rod length direction of the docking rod 70. The overhanging end of the drive unit 50 is connected to the push-pull rod 51, and the overhanging end of the push-pull rod 51 has a T-shaped head 52 which is inserted and matched with the T-shaped slot 72.

[0023] The driving unit 50 is connected to the mounting frame 30 through the push-pull rod 51 and the docking rod 70 to push and pull the mounting frame 30 and drive the pneumatic measuring head 60 to move. The insertion and cooperation between the push-pull rod 51 and the docking rod 70 at the proximal end realizes the radial movement and the connection relationship between the two and the limit in the direction of the rod length, which can not only achieve rapid docking, but also avoid the situation that the installation position of the push-pull rod 51 and the docking rod 70 in the direction perpendicular to the rod length is deviated, which makes it difficult to connect the driving unit 50 with the mounting frame 30.

Claims

1. A device for detecting the size of sand holes in an engine cylinder head, characterized in that: A probe mounting seat (61) is arranged on a mounting frame (30) that is slidably matched with a guide rail (20); an air inlet (66) on the probe mounting seat (61) is connected to an air outlet end of a pneumatic measuring instrument host (80); an axis core of an axial pneumatic measuring head (60) on the probe mounting seat (61) is parallel to the guide rail (20); and the air inlet (66) is communicated with an air outlet (68) on an arc surface of the pneumatic measuring head (60).

2. The engine cylinder head sand hole size detection device according to claim 1, characterized in that: A combined structure formed by the probe mounting seat (61) and the pneumatic measuring head (60) and the mounting frame (30) form a radial floating and axial limiting fit.

3. The engine cylinder head sand hole size detection device according to claim 1 or 2, characterized in that: A rear shaft (64) is provided on the rear side end surface of the probe mounting seat (61), the rear shaft (64) and the pneumatic measuring head (60) are coaxially arranged, a circumferentially arranged annular flange (641) is provided on the shaft body of the rear shaft (64), the inner ring of the annular plate (621) is clamped in the annular groove between the annular flange (641) and the rear end surface of the probe mounting seat (61) to form radial sliding and axial limiting cooperation, the inner ring aperture of the annular plate (621) is larger than the diameter of the rear shaft (64), the barrel mouth of the cylindrical shell-shaped base (62) is detachably fixedly connected to the plate edge of the annular plate (621), a spring (65) is provided between the base (62) and the shaft body of the rear shaft (64), and the elastic force provided by the spring (65) acts on the rear shaft (64) in the radial direction.

4. The engine cylinder head sand hole size detection device according to claim 3, characterized in that: The edge of the suspended end of the pneumatic measuring head (60) is provided with a circular arc chamfer (67).

5. The engine cylinder head sand hole size detection device according to claim 1, characterized in that: A driving unit (50) composed of an air cylinder, an oil cylinder or an electric cylinder is arranged on the platform (10) connected to the guide rail (20) to drive the mounting frame (30) to slide along the guide rail (20).

6. The engine cylinder head sand hole size detection device according to claim 5, characterized in that: The front end of the docking rod (70) is detachably connected to the rear side plate of the mounting frame (30) by a flange (71); the rear end of the docking rod (70) is provided with a closed T-shaped slot (72); the slot length direction of the T-shaped slot (72) is perpendicular to the rod length direction of the docking rod (70); the overhanging end of the driving unit (50) is connected with a push-pull rod (51); the overhanging end of the push-pull rod (51) is provided with a T-shaped head (52) which is inserted and matched with the T-shaped slot (72).

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