Device for measuring straightness of engine push rod

Abstract

The utility model discloses an engine push rod straightness measuring device, which comprises a hollow box body, a first side surface of the hollow box body is arranged to be in an opening state, a support plate extends outwards from the opening, a first end, close to the opening, of the support plate is fixedly provided with a first convex block, and a second end, close to the opening, of the support plate is fixedly provided with a second convex block; a first groove is formed in the upper end of the first convex block, and a second groove is formed in the upper end of the second convex block; the first groove is used for placing one end of a to-be-detected engine push rod, and the second groove is used for placing the other end; the end, away from the opening, of the supporting plate and the top end of the first protruding block obliquely support a light barrier, an LED lamp tube is arranged below the light barrier and attached to the wall face of the supporting plate, a screen is arranged in the second side face, away from the first side face, of the hollow box body, and a plurality of scale marks are transversely arranged on the screen. And the distances between any two adjacent scale marks in the plurality of scale marks are equal.

Description

Technical Field

[0001] The present invention relates to the technical field of engine push rods, and in particular to a device for measuring the straightness of an engine push rod. Background Art

[0002] The valve push rods of the engine are generally hollow and slender rods. When working, the valve push rods are subjected to bidirectional compressive loads. Although the two ends of the push rods use spherical surfaces to achieve contact with the push rods and the adjustment screws, the longitudinal bending deformation of the valve push rods will still occur due to the vibration of the engine during operation and the constant change of the contact point. Straightness is one of the most critical quality parameters of the engine push rod, so it is necessary to measure the straightness of the push rod. Commonly used measurement methods for measuring the straightness of engine push rods include ruler method, collimation method, gravity method and straight line method, etc., but these methods often require more complex and expensive measuring equipment, and the operation process is cumbersome, resulting in low measurement efficiency. Therefore, a device with low measurement cost, easy operation, and the ability to intuitively display measurement results is needed. Utility Model Content

[0003] In order to solve the above technical problems, the embodiment of this specification is implemented as follows: The utility model provides a device for measuring the straightness of an engine push rod, so that the straightness of the engine push rod can be measured simply and intuitively at a low cost. The device for measuring the straightness of the engine push rod provided by the utility model includes:

[0004] A hollow box body, wherein the first side surface of the hollow box body is set to an open state, a support plate extends outward from the opening of the hollow box body, a first protrusion is fixedly provided on the first end of the support plate near the opening, and a second protrusion is fixedly provided on the second end of the support plate near the opening; a first groove is provided on the upper end of the first protrusion, and a second groove is provided on the upper end of the second protrusion; the first groove is used to place one end of the engine push rod to be detected, and the second groove is used to place the other end of the engine push rod to be detected; the lowest points of the first groove and the second groove are flush in height in the vertical direction, and the lowest points of the first groove and the second groove are a predetermined distance from the support plate;

[0005] A light blocking plate is obliquely supported at one end of the support plate away from the opening and the top of the first protrusion, an LED light tube is arranged under the light blocking plate, and the LED light tube is in contact with the wall surface of the support plate. A screen is arranged inside the second side surface of the hollow box body away from the first side surface, and a plurality of scale lines are arranged horizontally on the screen, and the distance between any two adjacent scale lines among the plurality of scale lines is equal.

[0006] Preferably, the distance between any two adjacent scale lines ranges from 0.5 mm to 1 mm.

[0007] Preferably, a tube holder for fixing the LED lamp tube is fixedly provided on the support plate near the bottom end of the first protrusion.

[0008] Preferably, the distance between the lowest point of the first groove and the second groove and the upper surface of the support plate is between 0.5 cm and 2 cm.

[0009] Preferably, the support plate is provided with a first internal thread and a second internal thread at a position close to the first end of the opening, respectively, and the first internal thread and the second internal thread are flush in the extension direction of the support plate; the support plate is provided with a third internal thread and a fourth internal thread at a position close to the second end of the opening, respectively, and the third internal thread and the fourth internal thread are flush in the extension direction of the support plate; the first internal thread is connected to a first threaded column, the second internal thread is connected to a second threaded column, the third internal thread is connected to a third threaded column, and the fourth internal thread is connected to a fourth threaded column;

[0010] The bottom end of the first protrusion is respectively provided with a fifth internal thread that cooperates with the first threaded column, and a sixth internal thread that cooperates with the second threaded column. The bottom end of the second protrusion is respectively provided with a seventh internal thread that cooperates with the third threaded column, and an eighth internal thread that cooperates with the fourth threaded column.

[0011] Preferably, the material of the light baffle is plastic, and the outer surface of the light baffle is coated with a light-proof material; the material of the hollow box is metal, and the outer surface of the hollow box is coated with a light-proof material.

[0012] The embodiments of this specification can achieve the following beneficial effects: the measuring device for the straightness of the engine push rod provided by the utility model places the two ends of the engine push rod through the first groove and the second groove, so that the engine push rod can rotate smoothly. During the rotation of the engine push rod, the light emitted by the LED lamp tube propagates in a straight line, so the measuring device can magnify the curved contour of the push rod and present it on the screen. At the same time, the screen is marked with scale lines. When the contour on the real image presented by the light exceeds a certain scale, it can be considered that the straightness of the push rod is unqualified, so that the straightness of the engine push rod can be conveniently and intuitively measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic diagram of the overall structure of a device for measuring the straightness of an engine push rod provided in this specification;

[0015] Figure 2 for Figure 1 A schematic diagram of the structure near the support plate 2 in a device for measuring the straightness of an engine push rod provided in this specification;

[0016] Figure 3 for Figure 1 The present specification provides a schematic structural diagram of an engine push rod straightness measuring device without the engine push rod to be tested.

[0017] Among them, 1 represents a hollow box, 2 represents a support plate, 3 represents a first protrusion, 4 represents a second protrusion, 5 represents a first groove, 6 represents a second groove, 7 represents an engine push rod to be tested, 8 represents a light baffle, 9 represents an LED lamp tube, 10 represents a first side surface, and 11 represents a tube holder. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of one or more embodiments of this specification clearer, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this description, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of one or more embodiments of this specification.

[0019] The following describes in detail the various components of the engine push rod straightness measuring device provided by the embodiment of the present application in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, Figure 1 The overall structure diagram of a device for measuring the straightness of an engine push rod provided in this specification is as follows: Figure 1As shown, the measuring device includes a hollow box 1, and the first side 10 of the hollow box 1 is set to an open state, that is, the hollow box 1 can be understood as a rectangular box in terms of shape. The material of the box can be metal and can be obtained by casting. The box has a certain thickness and one side 10 is open. A support plate 2 extends outward from the opening of the hollow box 1, that is, because the rectangular box has a certain thickness, the opening can be regarded as a "U" structure in shape, and the part between the two "mouth" of the "U" structure is solid, and a support plate 2 extends outward from the opening. Specifically, the support plate 2 can be welded to the opening by welding. A first protrusion 3 is fixedly provided on the first end of the support plate 2 near the opening, and a second protrusion 4 is fixedly provided on the second end of the support plate 2 near the opening. A first groove 5 is provided on the upper end of the first protrusion 3, and a second groove 6 is provided on the upper end of the second protrusion 4; the first groove 5 is used to place one end of the engine push rod 7 to be detected, and the second groove 6 is used to place the other end of the engine push rod 7 to be detected, that is, when the straightness of the engine push rod 7 to be detected is detected, the two ends of the engine push rod 7 to be detected can be placed on the first groove 5 and the second groove 6 respectively, and the arrangement of the grooves 5 and 6 ensures that when the engine push rod 7 to be detected is rotated manually (that is, one end of the engine push rod 7 to be detected is manually rotated), it will not move in the up and down directions and the horizontal direction to affect the accuracy of the measurement result, that is, when the engine push rod 7 to be detected "lies" on the grooves 5 and 6 by gravity, the grooves will limit the freedom of the engine push rod 7 to be detected, and it can be rotated stably by hand. The lowest points of the first groove 5 and the second groove 6 are flush in the vertical direction, and the lowest points of the first groove 5 and the second groove 6 are a predetermined distance from the support plate 2. The size of the predetermined distance can be set according to the actual scenario (such as the thickness of the engine push rod 7 to be detected). In an optional scenario, the distance between the lowest points of the first groove 5 and the second groove 6 and the upper surface of the support plate 2 is between 0.5cm and 2cm.

[0021] A light blocking plate 8 is obliquely supported at one end of the support plate 2 away from the opening and the top of the first protrusion 3, an LED lamp tube 9 is arranged under the light blocking plate 8, the LED lamp tube 9 is in contact with the wall surface of the support plate 2, and a screen is arranged inside the second side surface of the hollow box 1 away from the first side surface 10, and a plurality of scale lines are arranged horizontally on the screen, and the distance between any two adjacent scale lines among the plurality of scale lines is equal.

[0022] like Figure 2 As shown, Figure 2 for Figure 1 The structural schematic diagram of the support plate 2 in the engine push rod straightness measuring device provided in this specification is as follows: Figure 3 for Figure 1The present specification provides a structural diagram of a device for measuring the straightness of an engine push rod without removing the engine push rod to be tested, from Figure 2 It can be seen how the LED lamp tube 9 is placed. Figure 3 It can be seen how the first groove 5 and the second groove 6 are opened.

[0023] The engine push rod straightness measuring device provided by the utility model places the two ends of the engine push rod through the first groove and the second groove, so that the engine push rod can rotate smoothly. During the rotation of the engine push rod, the light emitted by the LED lamp tube propagates in a straight line, so the measuring device can magnify the curved contour of the push rod and present it on the screen. At the same time, the screen is marked with scale lines. When the contour on the real image presented by the light exceeds a certain scale, it can be considered that the straightness of the push rod is unqualified, so that the straightness of the engine push rod can be conveniently and intuitively measured.

[0024] After introducing the main structure of the engine push rod straightness measuring device provided by the utility model in the foregoing, some further improvement schemes of the measuring device in actual use scenarios are described below.

[0025] One of the purposes of the utility model is to intuitively display the degree of unqualified straightness of an engine push rod to be tested. Under the ideal condition that the straightness of the engine push rod is very good, the light emitted by the LED lamp tube propagates along a straight line, and the image formed on the screen through the bottom of the engine push rod to be tested is horizontal. When the engine push rod to be tested is bent due to use, the contour formed on the screen is not straight. The unevenness of the image can reflect the degree of bending of the push rod. In order to quantify the degree of bending, the distance between two adjacent scale lines on the screen can be adjusted. In the optional example, the distance between any two adjacent scale lines ranges from 0.5mm to 1mm.

[0026] Since the LED lamp tube 9 needs to be installed as straight as possible in this solution, in order to better fix the LED lamp tube 9, in an optional solution, a tube holder 11 for fixing the LED lamp tube 9 is fixedly provided on the support plate 2 near the bottom end of the first protrusion 3. The tube holder 11 can be used to fix the head of the LED lamp tube and can be used to power the LED lamp tube. The solution of installing the tube holder 11 on the support plate 2 is not specifically limited by the present invention.

[0027] Taking into account the different thicknesses of engine push rods of different models, in order to make the measuring device provided by the utility model more universal, that is, suitable for the straightness detection of engine push rods of different thicknesses, the height of the first groove 5 and the second groove 6 for placing the push rods can be adjusted, so that after a thicker push rod to be detected is placed on the groove, the most curved part of the push rod to be detected will not be unable to rotate due to the "resistance" of the support plate 2 due to the low height of the groove. Thus, in an optional scheme, the first end of the support plate 2 near the opening is respectively provided with a first internal thread and a second internal thread, and the first internal thread and the second internal thread are flush in the extension direction of the support plate 2; the second end of the support plate 2 near the opening is respectively provided with a third internal thread and a fourth internal thread, and the third internal thread and the fourth internal thread are flush in the extension direction of the support plate 2; the first internal thread is connected to the first threaded column, the second internal thread is connected to the second threaded column, the third internal thread is connected to the third threaded column, and the fourth internal thread is connected to the fourth threaded column; the bottom end of the first protrusion 3 is respectively provided with a fifth internal thread that cooperates with the first threaded column, and a sixth internal thread that cooperates with the second threaded column, and the bottom end of the second protrusion 4 is provided with a seventh internal thread that cooperates with the third threaded column, and an eighth internal thread that cooperates with the fourth threaded column.

[0028] In this solution, the height of the first protrusion 3 can be adjusted by matching the first threaded column with the first internal thread and the fifth internal thread, and by matching the second threaded column with the second internal thread and the sixth internal thread. Similarly, the height of the second protrusion 4 can be adjusted, so that when a thicker push rod to be tested is placed on the groove, it will not be unable to rotate due to the "resistance" of the support plate 2 due to the low height of the groove.

[0029] In an optional solution, the light baffle 8 is made of plastic, and the outer surface of the light baffle 8 is coated with an opaque material. The hollow box 1 is made of metal, and the outer surface of the hollow box 1 is coated with an opaque material. This can make the light blocking effect of the light baffle 8 better and the brightness of the screen inside the hollow box 1 brighter.

[0030] Based on the introduction of the structure of the measuring device for the straightness of the engine push rod provided by the utility model, the following is an explanation of how to use the measuring device to measure the straightness of the engine push rod: the valve push rod of the engine is generally a hollow and slender rod. When working, the valve push rod bears a bidirectional compressive load. Although the two ends of the push rod use spherical surfaces to achieve contact with the push rod and the adjustment screw, due to the vibration of the engine during operation and the constant change of the contact point, the longitudinal bending deformation of the valve push rod will still occur, so it is necessary to measure the straightness of the push rod. Since the push rod has a certain curvature, the push rod will be placed on the platform surface (i.e., the support plate 2) of the measuring device and a gap will be generated therebetween. A beam of light emitted by the LED lamp will pass through the gap and present a real image on the screen. Since the light propagates in a straight line, the device can magnify the curved contour of the push rod and present it on the screen. At the same time, there are scale lines on the screen. When the contour on the real image presented by the light exceeds a certain scale, it can be considered that the straightness of the push rod is unqualified.

[0031] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A device for measuring the straightness of an engine push rod, characterized in that: The device comprises: A hollow box (1), wherein a first side surface (10) of the hollow box (1) is set to an open state, a support plate (2) extends outward from the opening of the hollow box (1), a first protrusion (3) is fixedly provided on the first end of the support plate (2) near the opening, and a second protrusion (4) is fixedly provided on the second end of the support plate (2) near the opening; a first groove (5) is provided at the upper end of the first protrusion (3), and a second groove (6) is provided at the upper end of the second protrusion (4); the first groove (5) is used to place one end of an engine push rod (7) to be detected, and the second groove (6) is used to place the other end of the engine push rod (7) to be detected; the lowest points of the first groove (5) and the second groove (6) are flush in height in the vertical direction, and the lowest points of the first groove (5) and the second groove (6) are at a predetermined distance from the support plate (2); A light blocking plate (8) is obliquely supported at one end of the support plate (2) away from the opening and at the top end of the first protrusion (3); an LED light tube (9) is arranged below the light blocking plate (8); the LED light tube (9) is in contact with the wall surface of the support plate (2); a screen is arranged inside the second side surface of the hollow box (1) away from the first side surface (10); a plurality of scale lines are arranged horizontally on the screen, and the distance between any two adjacent scale lines among the plurality of scale lines is equal.

2. The engine push rod straightness measuring device according to claim 1, characterized in that: The distance between any two adjacent scale lines ranges from 0.5 mm to 1 mm.

3. The engine push rod straightness measuring device according to claim 1, characterized in that: A tube holder (11) for fixing the LED lamp tube (9) is fixedly arranged on the support plate (2) near the bottom end of the first protrusion (3).

4. The engine push rod straightness measuring device according to claim 1, characterized in that: The distance between the lowest point of the first groove (5) and the second groove (6) and the upper surface of the support plate (2) is between 0.5 cm and 2 cm.

5. The engine push rod straightness measuring device according to claim 1, characterized in that: The first end of the support plate (2) near the opening is provided with a first internal thread and a second internal thread respectively, and the first internal thread and the second internal thread are flush in the extension direction of the support plate (2); the second end of the support plate (2) near the opening is provided with a third internal thread and a fourth internal thread respectively, and the third internal thread and the fourth internal thread are flush in the extension direction of the support plate (2); the first internal thread is connected to a first threaded column, the second internal thread is connected to a second threaded column, the third internal thread is connected to a third threaded column, and the fourth internal thread is connected to a fourth threaded column; The bottom end of the first protrusion (3) is provided with a fifth internal thread that cooperates with the first threaded column, and a sixth internal thread that cooperates with the second threaded column, respectively; the bottom end of the second protrusion (4) is provided with a seventh internal thread that cooperates with the third threaded column, and an eighth internal thread that cooperates with the fourth threaded column.

6. The engine push rod straightness measuring device according to claim 1, characterized in that: The material of the light baffle (8) is plastic, and the outer surface of the light baffle (8) is coated with a light-proof material; the material of the hollow box (1) is metal, and the outer surface of the hollow box (1) is coated with a light-proof material.

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