Detection device for diesel engine cylinder cover production

Abstract

The invention belongs to the technical field of flatness detection, and particularly relates to a detection device for diesel engine cylinder cover production, which comprises a detection tool and a dial indicator for detecting the surface flatness of a diesel engine cylinder cover, and is characterized in that the dial indicator comprises a dial plate and a gauge outfit, and the gauge outfit is in transmission connection in the dial plate through a gear; the interior of the gauge outfit is hollow, a doctor blade is fixed on the inner wall of the gauge outfit, and a ball is arranged on the inner side of the bottom of the gauge outfit; a threaded hole is formed in the right side of the bottom of the gauge head, a through hole is formed in the left side, a sliding hole is formed in the middle of the ball, and a shaft rod is slidably connected into the sliding hole; the right end of the shaft rod is in a threaded shape, the left end of the shaft rod is in a smooth shape, the threaded part of the shaft rod is in threaded connection with the interior of the threaded hole of the gauge outfit, and the device solves the problem that during current flatness detection, the gauge outfit of the dial gauge continuously rolls on the detection surface, so that dirt is accumulated at the bottom of the dial gauge, and the detection precision is affected.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flatness detection, and particularly relates to a detection device for diesel engine cylinder head production. BACKGROUND

[0002] The diesel engine cylinder head is installed on the top of the cylinder block and is used for closing the cylinder and forming a combustion chamber, and is made of cast iron or aluminum alloy, and after production, the diesel engine cylinder head needs to be detected for flatness to ensure production quality. Flatness detection is generally measured by a dial gauge. The workpiece is placed on a standard flat plate, the flat plate is used as a reference surface, the actual surface height of the workpiece is measured point by point or in a straight line direction by a dial gauge, and finally the maximum variation is determined as the flatness error value.

[0003] At present, when the dial gauge on the market detects flatness, there is dirt on the diesel engine cylinder head, and even after wiping or cleaning, there will still be residual dirt. Therefore, when the dial gauge head moves on the surface of the diesel engine cylinder head, the dirt will be scraped off. After long-term detection, the dial gauge head accumulates dirt, which causes the movement to be not smooth, reduces the detection accuracy, and affects the detection quality. This phenomenon has become a problem that needs to be solved by personnel in the field. SUMMARY

[0004] The purpose of the present application is to provide a detection device for diesel engine cylinder head production to solve the problems in the background art.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme: a detection device for diesel engine cylinder head production, comprising a detection tool and a dial gauge required for detecting the flatness of the surface of the diesel engine cylinder head, the dial gauge comprising a dial plate and a dial head, the dial head being connected to the dial plate by gear transmission; the dial head is hollow inside, and the inner wall is fixed with a scraper, the bottom inside of the dial head is provided with a ball; a threaded hole is formed in the right side of the bottom of the dial head, and a through hole is formed in the left side, a sliding hole is formed in the middle of the ball, and a shaft rod is slidably connected in the sliding hole; the right end of the shaft rod is threaded, and the left end is smooth, the threaded part of the shaft rod is screwed into the threaded hole of the dial head, the smooth part of the shaft rod is slidably connected into the through hole of the dial head, and the left and right sides of the shaft rod are both screwed with a limiting block, and the ball is located between the two limiting blocks.

[0006] The application further discloses a detection method for the flatness of the surface of the diesel engine cylinder cover, which comprises the following steps: S1, installing a dial indicator on a support of a detection tool, vertically aligning a dial head with the surface of the diesel engine cylinder cover, pre-pressing the dial head by about 0.2 mm, and adjusting a pointer to zero; S2, slowly moving the support along the surface of the diesel engine cylinder cover to be detected, and recording a reading every 50 mm, if the pointer swings more than ±0.05 mm, marking an out-of-tolerance area and re-measuring; and S3, removing the diesel engine cylinder cover after the measurement is completed, and carrying out the next detection.

[0007] The application further discloses that the scraper is located above the ball, and a gap exists between the scraper and the ball; the ball comprises a left hemisphere and a right hemisphere, and the left hemisphere and the right hemisphere are separated from each other, the left hemisphere and the right hemisphere are rotationally connected to the shaft rod, and the inner sides of the left hemisphere and the right hemisphere are provided with counterbores which are uniformly distributed on the inner walls of the counterbores and are integrally formed with four jacks; the jacks of the left hemisphere and the jacks of the right hemisphere clamp the partition plate; and the partition plate is rotationally connected to the shaft rod.

[0008] The application further discloses that the shaft rod is provided with a boss in the middle, the inner side of the partition plate is provided with an arc-shaped groove, the boss is embedded in the arc-shaped groove, and the two sides of the boss are provided with springs; the left and right surfaces of the partition plate are provided with a plurality of spherical recesses, the inner end of the jack is spherical, and after the partition plate rotates, the spherical part of the jack is embedded in the spherical recess.

[0009] The application further discloses that the jacks of the left hemisphere and the jacks of the right hemisphere are magnetic and have opposite magnetic poles; the middle bottom of the scraper is integrally formed with a spring piece, the outer side of the partition plate is integrally formed with a protruding block, and after the partition plate rotates, the spring piece contacts the protruding block.

[0010] The application further discloses that the elasticity of the spring piece is smaller than that of the spring.

[0011] The application further discloses that the shaft rod and the partition plate further comprise another connecting mode, that is, the arc-shaped groove of the partition plate, the boss on the shaft rod and the springs on the two sides of the boss are removed, so that the partition plate is rotationally connected with the shaft rod.

[0012] The application further discloses that the spherical recesses on the partition plate are distributed on the two sides of the jack.

[0013] Compared with the prior art, the present application has the advantages that: the present application rotates the ball on the shaft, and in the process of rotation, the surface of the ball contacts with the scraper, and the scraper removes the dirt on the ball, so that the ball rolls more smoothly on the surface of the cylinder head of the diesel engine, and the flatness detection accuracy is higher, the detection accuracy is not affected by the dirt, the ball can be removed for replacement, the operation is convenient and fast, the service life of the detection device is greatly increased by replacing the ball only, the replacement cost is low, the overall structure is simple, the manufacturing cost is relatively low, and the like.

[0014] In the process that the left hemisphere and the right hemisphere approach each other and then move away from each other, the gap between the upper surface of the ball and the scraper increases, so that the dirt removed by the scraper can be relatively loose, so as to facilitate the falling of the dirt, thereby improving the smoothness of the ball rolling, avoiding the dirt accumulation to cause the ball to be stuck and affect the surface flatness detection quality and detection accuracy, and the left hemisphere and the right hemisphere approach each other to extrude the dirt, accelerate the loosening strength of the dirt, and strengthen the loosening degree of the dirt, so as to facilitate the falling of the dirt.

[0015] The action force of the spring on the protrusion and the action force between the top rod and the spherical recess make the speed of the top rod and the spherical recess moving away from each other faster, and the action force of the spring accelerates the reset of the partition plate, so that the speed of the top rod entering the next spherical recess is faster, the frequency of the left hemisphere and the right hemisphere swinging back and forth is faster, the dirt falling speed can be further accelerated, and when the dial test indicator moves faster, the dirt falling frequency can be improved, so that the ball rolls smoothly at all times, and the detection accuracy is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic diagram of the internal structure of the dial head of the present application;

[0019] Figure 3 is an exploded view of the internal structure of the dial head of the present application;

[0020] Figure 4 is a sectional view of the ball of the present application;

[0021] Figure 5 is a schematic diagram of the setting mode of the boss and the spring on the shaft of the present application;

[0022] Figure 6This is a plan view of the two types of partitions of the present invention;

[0023] In the diagram: 1. Inspection fixture; 2. Dial indicator; 21. Dial dial; 22. Dial head; 23. Scraper; 24. Shaft; 25. Limit block; 26. Ball bearing; 27. Divider; 28. Top rod. Detailed Implementation

[0024] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-6 The present invention provides a technical solution: a testing device for the production of diesel engine cylinder heads, including a testing fixture 1 and a dial indicator 2 for testing the surface flatness of the diesel engine cylinder head. The dial indicator 2 includes a dial 21 and a gauge head 22, and the gauge head 22 is connected to the dial 21 through gear transmission.

[0026] The inside of the meter head 22 is hollow, and a scraper 23 is fixed on the inner wall. A ball bearing 26 is provided on the inner side of the bottom of the meter head 22.

[0027] The bottom right side of the head 22 is provided with a threaded hole and the left side is provided with a through hole. The middle of the ball 26 is provided with a sliding hole, and the shaft 24 is slidably connected in the sliding hole.

[0028] The right end of the shaft 24 is threaded and the left end is smooth. The threaded part of the shaft 24 is threaded into the threaded hole of the meter head 22, and the smooth part of the shaft 24 is slidably connected into the through hole of the meter head 22. Limiting blocks 25 are threadedly connected to both sides of the shaft 24, and the ball 26 is located between the two limiting blocks 25.

[0029] The diesel engine cylinder head to be tested is placed on the testing fixture 1, and the dial indicator 22 is brought into contact with the surface of the diesel engine cylinder head. Then, the dial indicator 2 is moved so that the dial 21 and the dial indicator 22 move synchronously. The dial indicator 22 moves on the surface of the diesel engine cylinder head to test the surface flatness of the diesel engine cylinder head. During the test, the ball bearing 26 rolls on the surface of the diesel engine cylinder head as the dial indicator 22 moves. The ball bearing 26 rotates through the shaft 24. During the rotation, the surface of the ball bearing 26 comes into contact with the scraper 23. The scraper 23 scrapes away the dirt on the ball bearing 26, so that the ball bearing 26 rolls more smoothly on the surface of the diesel engine cylinder head. The removal of dirt also makes the flatness test more accurate and avoids the reduction of test accuracy due to the influence of dirt.

[0030] After prolonged use, the ball bearing 26 will wear out. At this time, the operator can rotate the shaft 24, so that the shaft 24 moves to the right while rotating through the threaded hole of the meter head 22, so that the left end of the shaft 24 is disengaged from the meter head 22. Then, the limit block 25 can be removed from the shaft 24 by rotating the thread, and the ball bearing 26 can be removed for replacement. The operation is convenient and quick, and only the ball bearing 26 needs to be replaced, which can greatly increase the service life of the detection device. The replacement cost is low, the overall structure is simple, and the manufacturing cost is relatively low.

[0031] The method for inspecting the surface flatness of the diesel engine cylinder head using tool 1 is as follows:

[0032] Step S1: Install dial indicator 2 on the bracket of the testing fixture, with the gauge head 22 vertically aligned with the surface of the diesel engine cylinder head, preload the gauge head by about 0.2mm, and adjust the pointer to zero;

[0033] Step S2: Slowly move the support along the measured surface of the diesel engine cylinder head, and record the reading every 50mm. If the pointer swings more than ±0.05mm, mark the out-of-tolerance area and retest.

[0034] Step S3: Measurement complete. Remove the diesel engine cylinder head and proceed with the next inspection.

[0035] The scraper 23 is positioned above the ball 26, and there is a gap between them;

[0036] The ball bearing 26 includes a left hemisphere and a right hemisphere, and the left hemisphere and the right hemisphere are separated from each other. Both the left hemisphere and the right hemisphere are rotatably connected to the shaft 24, and both have countersunk holes on their inner sides. The inner walls of the countersunk holes are evenly distributed, and four push rods 28 are integrally formed.

[0037] A partition 27 is sandwiched between the top rod 28 of the left hemisphere and the top rod 28 of the right hemisphere;

[0038] The partition 27 is rotatably connected to the shaft 24.

[0039] A boss is provided in the middle of the shaft 24, and an arc-shaped groove is provided on the inner side of the partition 27, with the boss embedded in the arc-shaped groove. Springs are provided on both sides of the boss.

[0040] Several spherical recesses are provided on both the left and right sides of the partition plate 27. The inner end of the push rod 28 is spherical. After the partition plate 27 is rotated, the spherical part of the push rod 28 is embedded in the spherical recesses.

[0041] The top rod 28 of the left hemisphere and the top rod 28 of the right hemisphere are both magnetic and have opposite magnetic poles;

[0042] The scraper 23 has a spring piece integrally formed at the bottom center, and the partition 27 has a protrusion integrally formed on the outer side. When the partition 27 rotates, the spring piece contacts the protrusion.

[0043] The elasticity of the spring is less than that of the spring.

[0044] When the ball 26 rotates, its push rod 28 presses against the partition 27 and rubs against the surface of the partition 27. When the push rod 28 moves to the spherical recess of the partition 27, a magnetic attraction force is generated between the push rods 28 on the left and right hemispheres, causing the left and right hemispheres to move closer to each other. The push rod 28 is embedded in the spherical recess. Then the push rod 28 applies force to the partition 27 through the spherical recess, causing the boss to compress the spring. As the force on the spring gradually increases, its reaction force pushes the partition 27 to rotate rapidly in the opposite direction. At the same time, the force between the push rod 28 and the spherical recess gradually increases and they separate from each other. The push rod 28 contacts the surface of the partition 27 again, causing the left and right hemispheres to move away from each other and reset.

[0045] Example 1:

[0046] Reference Appendix Figure 4 As the left and right hemispheres approach and then move away from each other, the gap between the upper surface of the ball 26 and the scraper 23 increases, so that the dirt scraped off by the scraper 23 can be relatively loosened, so that the dirt can be loosened and fall off, thereby improving the smoothness of the ball 26 rolling and avoiding dirt accumulation that causes the ball 26 to get stuck, affecting the surface flatness detection quality and detection accuracy.

[0047] Example 2:

[0048] Reference Appendix Figure 4 As the left and right hemispheres approach and then move away from each other, the dirt scraped off by the scraper 23 accumulates on top. As the left and right hemispheres approach each other, the dirt is squeezed, which accelerates the loosening of the dirt and makes it easier for the dirt to fall off.

[0049] Example 3:

[0050] Reference Appendix Figure 5 The force of the spring on the protrusion and the force between the push rod 28 and the spherical recess accelerate the speed at which the push rod 28 and the spherical recess disengage. At the same time, the force of the spring accelerates the reset of the partition 26, so that the push rod 28 enters the next spherical recess at a faster speed. The frequency of back-and-forth swing between the left and right hemispheres is faster, which can further accelerate the speed of shaking off dirt. When the dial indicator 2 moves at a fast speed, the frequency of dirt falling off can be increased, thereby maintaining the high smoothness of the ball 26 rolling at all times and greatly improving the detection accuracy.

[0051] Moreover, it has a simple overall structure and low production cost. Compared with the traditional gauge 22, it can automatically remove dirt adhering to the gauge 22 during the testing process, thereby ensuring the accuracy of diesel engine cylinder head surface flatness testing and the smoothness of the testing process.

[0052] The shaft 24 and the partition 27 also include another connection method:

[0053] The arc-shaped groove of the partition 27, the boss on the shaft 24, and the springs on both sides of the boss are removed from the shaft 24, so that the partition 26 and the shaft 24 are rotatably connected.

[0054] Reference Appendix Figure 6 After removing the arc groove of partition 27, the boss on shaft 24 and the springs on both sides of the boss, after the push rod 28 pushes against partition 27, when the left and right hemispheres rotate, they drive partition 27 to rotate synchronously. When partition 27 rotates, the protrusion outside partition 26 contacts the spring on scraper 23 and is blocked by the spring, so that partition 27 cannot rotate. At this time, as the left and right hemispheres continue to rotate, the push rod 28 is embedded in the spherical recess and then disengages from it.

[0055] Example 4:

[0056] Reference Appendix Figure 6 For factories that inspect a large number of diesel engine cylinder heads daily, in order to improve inspection efficiency, the dial indicator 2 is moved relatively quickly. The partition 26 structure in Examples 1, 2 and 3 is adopted, which removes dirt more frequently, thereby improving the smoothness and accuracy of the inspection. However, the use of the structure is relatively increased, and the wear between the structures is relatively high. For factories that inspect a small number of diesel engine cylinder heads daily and do not require high inspection efficiency, the arc groove of partition 27, the boss on shaft 24 and the springs on both sides of the boss are removed. The dirt removal frequency is stable, the wear between push rod 28 and spherical pit is small, the service life of the structure is long, and the amount of structure used is reduced, thus reducing the manufacturing cost.

[0057] For factories that require testing the surface flatness of diesel engine cylinder heads, a manufacturing method using two sets of partition plates 26 is adopted. This method offers high flexibility in use, and the overall structure is detachable. Therefore, only one testing device is needed, making it widely applicable.

[0058] The spherical indentations on the partition 27 are distributed on both sides of the top rod 28.

[0059] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A testing device for diesel engine cylinder head production, comprising a testing fixture (1) and a dial indicator (2) for testing the surface flatness of the diesel engine cylinder head, characterized in that: The dial indicator (2) includes a dial (21) and a dial head (22), wherein the dial head (22) is connected to the dial (21) via gear transmission; The inside of the meter head (22) is hollow, and a scraper (23) is fixed on the inner wall. A ball bearing (26) is provided on the inner side of the bottom of the meter head (22). The bottom right side of the meter head (22) is provided with a threaded hole and the left side is provided with a through hole. The middle of the ball (26) is provided with a sliding hole, and a shaft (24) is slidably connected in the sliding hole. The right end of the shaft (24) is threaded and the left end is smooth. The threaded part of the shaft (24) is threaded into the threaded hole of the meter head (22), and the smooth part of the shaft (24) is slidably connected into the through hole of the meter head (22). Limiting blocks (25) are threadedly connected to both sides of the shaft (24), and the ball (26) is located between the two limiting blocks (25).

2. The testing device for diesel engine cylinder head production according to claim 1, characterized in that: The method by which the testing fixture (1) tests the surface flatness of the diesel engine cylinder head is as follows: Step S1: Install the dial indicator (2) on the bracket of the testing fixture, with the gauge head (22) vertically aligned with the surface of the diesel engine cylinder head, preload the gauge head by about 0.2mm, and adjust the pointer to zero; Step S2: Slowly move the support along the measured surface of the diesel engine cylinder head, and record the reading every 50mm. If the pointer swings more than ±0.05mm, mark the out-of-tolerance area and retest. Step S3: Measurement complete. Remove the diesel engine cylinder head and proceed with the next inspection.

3. The testing device for diesel engine cylinder head production according to claim 2, characterized in that: The scraper (23) is located above the ball (26), and there is a gap between them; The ball (26) includes a left hemisphere and a right hemisphere, and the left hemisphere and the right hemisphere are separated from each other. The left hemisphere and the right hemisphere are rotatably connected to the shaft (24), and the inner side of each hemisphere is provided with a countersunk hole. The inner wall of the countersunk hole is evenly distributed, and four push rods (28) are integrally formed. A partition plate (27) is held between the top rod (28) of the left hemisphere and the top rod (28) of the right hemisphere; The partition (27) is rotatably connected to the shaft (24).

4. The testing device for diesel engine cylinder head production according to claim 3, characterized in that: The shaft (24) has a boss in the middle, the partition (27) has an arc groove on the inner side, and the boss is embedded in the arc groove. Springs are provided on both sides of the boss. The left and right sides of the partition (27) are provided with several spherical recesses. The inner end of the top rod (28) is spherical. After the partition (27) is rotated, the spherical part of the top rod (28) is embedded in the spherical recess.

5. The testing device for diesel engine cylinder head production according to claim 4, characterized in that: The top rod (28) of the left hemisphere and the top rod (28) of the right hemisphere are both magnetic and have opposite magnetic poles; The scraper (23) has an integrally formed spring piece at its bottom center, and the partition (27) has an integrally formed protrusion on its outer side. When the partition (27) rotates, the spring piece contacts the protrusion.

6. The testing device for diesel engine cylinder head production according to claim 5, characterized in that: The elasticity of the spring is less than that of the spring.

7. The testing device for diesel engine cylinder head production according to claim 6, characterized in that: The shaft (24) and the partition (27) also include another connection method: The arc groove of the partition plate (27), the boss on the shaft (24) and the springs on both sides of the boss are removed from the shaft (24), so that the partition plate (26) and the shaft (24) are rotatably connected.

8. The testing device for diesel engine cylinder head production according to claim 7, characterized in that: The spherical recesses on the partition (27) are distributed on both sides of the top rod (28).

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