A detection device for diesel engine cylinder head production

Abstract

The present application 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 gauge required for detecting the flatness of the surface of the diesel engine cylinder cover. The dial gauge comprises a dial plate and a dial head, and the dial head is connected to the dial plate through gear transmission. The inside of the dial head is hollow, and the inner wall is fixed with a scraping sheet. 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 arranged 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 screw-connected in the threaded hole of the dial head. The device solves the problem that the dial head of the dial gauge continuously rolls on the detection surface during the current flatness detection, and dirt accumulates at the bottom of the dial gauge, which affects the detection accuracy.

Description

Technical Field

[0001] This invention belongs to the technical field of flatness inspection, specifically relating to an inspection device for diesel engine cylinder head production. Background Technology

[0002] The cylinder head of a diesel engine is a component installed on top of the cylinder block to seal the cylinder and form the combustion chamber. It is made of cast iron or aluminum alloy. After production, the cylinder head of a diesel engine needs to be inspected for flatness to ensure production quality. Flatness is generally measured by dial indicator measurement. The workpiece is placed on a standard plate, and the plate is used as a reference surface. The actual surface height of the workpiece is measured point by point or along a straight line using a dial indicator. Finally, the maximum variation is determined as the flatness error value.

[0003] Currently available dial indicators, when inspecting flatness, often encounter problems. Due to the presence of dirt on diesel engine cylinder heads, even after wiping or cleaning, residual dirt remains. As the dial indicator head moves across the cylinder head surface, it scrapes off this dirt. Over time, this buildup of dirt on the dial indicator head hinders its movement, reduces inspection accuracy, and affects overall inspection quality. This phenomenon has become a pressing issue requiring a solution. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for the production of diesel engine cylinder heads, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a testing device for diesel engine cylinder head production, comprising testing fixtures and a dial indicator for testing the surface flatness of the diesel engine cylinder head. The dial indicator includes a dial and a head, the head being connected to the dial via gear transmission. The head is hollow inside, with a scraper fixed to its inner wall. A ball bearing is provided on the inner side of the bottom of the head. A threaded hole is provided on the right side of the bottom of the head, and a through hole is provided on the left side. A sliding hole is provided in the middle of the ball bearing, and a shaft is slidably connected in the sliding hole. The right end of the shaft is threaded, and the left end is smooth. The threaded portion of the shaft is threaded into the threaded hole of the head, and the smooth portion of the shaft is slidably connected into the through hole of the head. Limit blocks are threadedly connected to both sides of the shaft, and the ball bearing is located between the two limit blocks.

[0006] The present invention further explains that the method of using the testing fixture to test the surface flatness of the diesel engine cylinder head is as follows: Step S1, install the dial indicator on the bracket of the testing fixture, align the indicator head vertically with the surface of the diesel engine cylinder head, pre-press the indicator head by about 0.2 mm, and adjust the pointer to zero; Step S2, slowly move the bracket along the surface of the diesel engine cylinder head to be tested, record a reading every 50 mm, if the pointer swings more than ±0.05 mm, mark the out-of-tolerance area and retest; Step S3, after the measurement is completed, remove the diesel engine cylinder head and perform the next test.

[0007] The present invention further describes that the scraper is located above the ball bearing, and there is a gap between the two; the ball bearing 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, and each hemisphere has a countersunk hole on its inner side. The inner wall of the countersunk hole is evenly distributed and has four push rods integrally formed; a partition is held between the push rods of the left hemisphere and the push rods of the right hemisphere; the partition is rotatably connected to the shaft.

[0008] The present invention further illustrates that a boss is provided in the middle of the shaft, an arc-shaped groove is provided on the inner side of the partition, and the boss is embedded in the arc-shaped groove. Springs are provided on both sides of the boss. Several spherical pits are provided on the left and right side surfaces of the partition. The inner end of the top rod is spherical. After the partition rotates, the spherical part of the top rod is embedded in the spherical pit.

[0009] The present invention further illustrates that the top rod of the left hemisphere and the top rod of the right hemisphere are both magnetic and have opposite magnetic poles; the scraper has an integrally formed spring piece at the bottom center, and the partition has an integrally formed protrusion on the outer side, and after the partition rotates, the spring piece contacts the protrusion.

[0010] The present invention further illustrates that the elasticity of the spring is less than that of the spring.

[0011] The present invention further illustrates that the shaft and the partition also include another connection method: the arc-shaped groove of the partition, the boss on the shaft, and the springs on both sides of the boss are removed from the shaft, so that the partition and the shaft are rotatably connected.

[0012] The present invention further illustrates that the spherical recesses on the partition are distributed on both sides of the top rod.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention uses a ball bearing that rotates on a shaft. During the rotation, the surface of the ball bearing comes into contact with a scraper, and the scraper removes the dirt on the ball bearing, thereby making the ball bearing roll more smoothly on the surface of the diesel engine cylinder head. Furthermore, by removing the dirt, the flatness detection accuracy is improved, avoiding the reduction in detection accuracy due to the influence of dirt. Moreover, the ball bearing can be removed for replacement, which is convenient and quick to operate. Simply replacing the ball bearing can greatly increase the service life of the detection device, resulting in low replacement costs. The overall structure is simple, and the manufacturing cost is relatively low.

[0014] As the left and right hemispheres approach and then move away from each other, the gap between the upper surface of the ball bearing and the scraper increases, allowing the dirt scraped off by the scraper to loosen relatively, thus improving the smoothness of the ball bearing's rolling and preventing dirt accumulation from causing the ball bearing to jam, affecting the surface flatness detection quality and accuracy. Furthermore, the approach of the left and right hemispheres squeezes the dirt, accelerating the loosening of the dirt and enhancing its looseness, making it easier for the dirt to fall off.

[0015] The force exerted by the spring on the protrusion, as well as the force between the push rod and the spherical recess, accelerates the speed at which the push rod disengages from the spherical recess. Simultaneously, the spring force accelerates the reset of the partition, allowing the push rod to enter the next spherical recess at a faster speed. The high frequency of back-and-forth oscillation between the left and right hemispheres further accelerates the shaking off of dirt. When the dial indicator moves at a high speed, the frequency of dirt falling off can be increased, thus maintaining the high smoothness of the ball's rolling and significantly improving detection accuracy. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

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

[0018] Figure 2 This is a schematic diagram of the internal structure of the meter head of the present invention;

[0019] Figure 3 This is an exploded view of the internal structure of the meter head of the present invention;

[0020] Figure 4 This is a cross-sectional view of the ball bearing of the present invention;

[0021] Figure 5 This is a schematic diagram illustrating the arrangement of the boss and spring on the shaft of the present invention;

[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 inspected is placed on the inspection 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 inspect the surface flatness of the diesel engine cylinder head. During the inspection, 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 inspection accuracy higher and avoids the reduction of inspection 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). 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 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. 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 sandwiched 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); 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 the bottom center, and the partition (27) has an integrally formed protrusion on the outer side. After the partition (27) rotates, the spring piece contacts the protrusion.

2. The testing device for diesel engine cylinder head production according to claim 1, 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 pits. 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 pit.

3. The testing device for diesel engine cylinder head production according to claim 2, characterized in that: The elasticity of the spring is less than that of the spring.

4. The testing device for diesel engine cylinder head production according to claim 3, 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 (27) and the shaft (24) are rotatably connected.

5. The testing device for diesel engine cylinder head production according to claim 4, characterized in that: The spherical recesses on the partition (27) are distributed on both sides of the top rod (28).

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