Engine pump body casting bore measuring device

Abstract

The application relates to the technical field of aperture measurement, in particular to an engine pump body casting aperture measuring device, which comprises a moving frame, a pneumatic measuring head, a supporting unit, a distance setting group and an angle setting group. The supporting assembly arranged in the application adapts to the measurement process of different casting holes on the engine pump body, supports the pneumatic measuring head before measurement, makes the axis of the pneumatic measuring head and the axis of the casting hole keep collinear, avoids the deviation of the pneumatic nozzle of the pneumatic measuring head from the measured plane to affect the accuracy of the measurement result, and ensures that the measured plane is the required measurement plane. Furthermore, the distance setting group and the angle setting group make the pneumatic measuring head perform multiple internal diameter measurements at different angles in multiple height planes, obtain multiple groups of data at different heights and different angles, and improve the accuracy of the measurement result.

Description

Technical Field

[0001] This invention relates to the field of aperture measurement technology, specifically to an engine pump body casting aperture measuring device. Background Technology

[0002] Measuring the casting bore diameter on the engine pump body is a core step in ensuring the reliability, performance, and service life of the engine pump body. In order to avoid contact with the inner wall of the casting bore diameter during the measurement process, non-contact measurement methods are usually used, such as using a pneumatic measuring instrument to measure the casting bore diameter.

[0003] Currently, when measuring the diameter of casting holes, the main method is to manually place the pneumatic probe of the pneumatic measuring instrument into the casting hole. The pneumatic probe is usually equipped with two symmetrically arranged nozzles. The dimensional distance between the nozzles on the pneumatic probe and the inner wall of the casting hole is converted into a change in the spatial gap, which causes a change in airflow or air pressure. This change is then converted into a measurable electrical signal or amplified into a significant pressure change, and finally the measurement result is displayed by the display system, thus completing the measurement process.

[0004] The above measurement process has the following problems: During the manual placement of the pneumatic probe, it is difficult to control the axis of the pneumatic probe and the axis of the casting hole to be on the required reference, which easily leads to deviation between the axis of the pneumatic probe and the axis of the casting hole, causing the measured plane to tilt and deviate from the required measurement plane. At the same time, the manual placement method affects the accuracy of the measurement process, thus affecting the final measurement result. Secondly, when the pneumatic probe is placed manually for measurement, the overall geometric dimension information of the casting hole from top to bottom cannot be completely obtained. Single point and single angle measurements can only measure local dimensions, which increases roundness error, cylindricity error, etc., affecting the final measurement accuracy. Summary of the Invention

[0005] Therefore, it is necessary to provide an engine pump body casting bore diameter measuring device to solve the problems of the prior art.

[0006] This application provides a device for measuring the casting bore diameter of an engine pump body, comprising:

[0007] A movable frame is provided, on which a measuring mechanism for measuring the inner diameter of a casting hole is provided. The measuring mechanism includes a pneumatic probe. The pneumatic probe is rotatably mounted at the center of the movable frame via a rotating shaft. A support unit is also provided on the movable frame. The support unit not only supports the overall measuring mechanism but also ensures that the axis of the pneumatic probe is collinear with the axis of the inner diameter of the casting hole.

[0008] The support unit includes sliding blocks. Two symmetrical sliding blocks are slidably arranged on the movable frame. A rotating column with a vertical axis is rotatably arranged on the sliding blocks. A U-shaped frame located below the movable frame and with its opening facing downwards is movably sleeved on the rotating column. A support component is movably inserted into the U-shaped frame. A drive group for driving the sliding blocks to move is also provided on the movable frame.

[0009] The support assembly adapts to the areas on both sides of the casting hole and supports the movable frame. The drive assembly makes the axis of the pneumatic probe collinear with the axis of the casting hole.

[0010] The movable frame is equipped with a fixed angle group for controlling the circumferential angle of the pneumatic probe, and the sliding block is equipped with a fixed distance group for controlling the distance between the movable frame and the U-shaped frame. The fixed distance group is used to measure the inner diameter of different height areas in the casting hole, and the fixed angle group is used to measure the inner diameter of the same height area in the casting hole.

[0011] According to an advantageous embodiment, the drive assembly includes bidirectional threaded rods, and two bidirectional threaded rods distributed front to back and extending from left to right are rotatably disposed on the moving frame. The bidirectional threaded rods pass through the sliding block and are threadedly engaged with the sliding block.

[0012] According to an advantageous embodiment, the support unit further includes insertion holes, and two symmetrical insertion holes are provided through the U-shaped frame, with insertion posts movably inserted into the insertion holes and locking pins installed on the insertion posts.

[0013] The support assembly includes a support plate, with a support plate fixedly mounted on two plug-in posts on the same side, and a positioning post fixedly mounted on the lower end face of the support plate.

[0014] According to an advantageous embodiment, the support assembly includes a support frame, with a T-shaped support frame commonly provided on two plug-in posts on the same side. When the vertical section of the support frame is in contact with the outer side of the casting hole area, the horizontal section of the support frame abuts against the upper end of the casting hole.

[0015] According to an advantageous embodiment, the support unit further includes a mounting frame, on which a U-shaped mounting frame is fixedly mounted, and the two U-shaped frames on the left and right are staggered front and back. An L-shaped frame is movably inserted into the mounting frame, and an arc-shaped bonding plate is rotatably provided at the end of the L-shaped frame away from the mounting frame. The two bonding plates on the left and right are symmetrically arranged.

[0016] According to an advantageous embodiment, the L-shaped frame has a plurality of mounting holes arranged equidistantly from left to right on its transverse section, and a pin with a vertical axis is movably inserted into the mounting frame.

[0017] According to an advantageous embodiment, when the two sliding blocks approach each other, the bonding plate is located between the casting hole and the corresponding U-shaped frame, which is suitable for the case where the blocks are pressed together by the support frame. When the two sliding blocks move away from each other, the casting hole is located between the bonding plate and the corresponding U-shaped frame, which is suitable for the case where the positioning pins are moved away from each other by the support plate for positioning and clamping.

[0018] According to an advantageous embodiment, the fixed-distance group includes a slot 1. The circumferential surface of the rotating column is provided with a plurality of slots 1 distributed equidistantly from top to bottom. The sidewall of the slot 1 is an arc-shaped surface. A limit rod is movably arranged on the horizontal section of the U-shaped frame. A return spring 1 is provided between the limit rod and the U-shaped frame.

[0019] An electric push rod is provided within the U-shaped area of ​​the U-shaped frame, and the telescopic end of the electric push rod is rotatably connected to the rotating column.

[0020] According to an advantageous embodiment, the fixed angle assembly includes a control ring, a control ring is fixedly disposed on the upper end face of the movable frame, a plurality of circumferentially distributed slots are opened on the inner circumferential surface of the control ring, a locking rod slides through the rotating shaft, a locking ball is fixedly disposed at one end of the locking rod, and a return spring is fixedly disposed at the other end of the locking rod together with the rotating shaft.

[0021] In summary, the present invention has at least one of the following beneficial effects: The support component provided in the present invention adapts to the measurement process of different casting holes on the engine pump body, and supports the pneumatic probe before measurement so that the axis of the pneumatic probe is collinear with the axis of the casting hole, avoiding the deviation of the pneumatic nozzle of the pneumatic probe from the plane being measured, which affects the accuracy of the measurement results, and ensuring that the plane being measured is the required measurement plane. Secondly, through the fixed distance group and fixed angle group, the pneumatic probe performs multiple inner diameter measurements at different angles in multiple set height planes, obtaining multiple sets of data at different heights and angles, thereby improving the accuracy of the measurement results. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A three-dimensional structural schematic diagram of an engine pump body casting bore diameter measuring device provided according to an embodiment of the present invention is shown.

[0024] Figure 2 A three-dimensional structural diagram of the positioning post, bonding plate, and L-shaped frame provided according to an embodiment of the present invention is shown.

[0025] Figure 3 A partial cross-sectional perspective view of the three-dimensional structure between the rotating column, the U-shaped frame, and the positioning column provided according to an embodiment of the present invention is shown.

[0026] Figure 4 A partial cross-sectional view of the structure between the positioning rod, the moving frame, and the pneumatic probe provided according to an embodiment of the present invention is shown.

[0027] Figure 5 A three-dimensional structural diagram of the support frame, bonding plate, and L-shaped frame provided according to an embodiment of the present invention is shown.

[0028] The above figures include the following reference numerals:

[0029] 1. Moving frame; 2. Measuring mechanism; 20. Pneumatic probe; 21. Support unit; 210. Sliding block; 211. Rotating column; 212. U-shaped frame; 213. Support assembly; 2130. Support plate; 2131. Positioning column; 2132. Support frame; 214. Bidirectional threaded rod; 216. Insertion column; 217. Locking pin; 22. Mounting frame; 220. L-shaped frame; 221. Adhesive plate; 222. Mounting hole; 223. Pin; 23. Distance group; 230. Slot one; 231. Limiting rod; 232. Return spring one; 233. Electric push rod; 24. Angle group; 240. Control ring; 241. Slot two; 242. Positioning rod; 243. Return spring two. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 and Figure 2 As shown, an engine pump body casting bore diameter measuring device includes:

[0032] A movable frame 1 is provided, on which a measuring mechanism 2 for measuring the inner diameter of a casting hole is mounted. The measuring mechanism 2 includes a pneumatic probe 20, which is rotatably mounted at the center of the movable frame 1 via a rotating shaft. A support unit 21 is also provided on the movable frame 1, which not only supports the entire measuring mechanism 2 but also ensures that the axis of the pneumatic probe 20 is collinear with the axis of the casting hole. A handle is fixedly provided on the movable frame 1 to facilitate manual lifting and lowering of the measuring device.

[0033] like Figure 1 , Figure 2 and Figure 5 As shown, the support unit 21 includes sliding blocks 210. Two symmetrical sliding blocks 210 are slidably arranged on the movable frame 1. A vertically oriented rotating column 211 is rotatably mounted on each sliding block 210. A U-shaped frame 212, located below the movable frame 1 and with its opening facing downwards, is movably fitted onto the rotating column 211. A support assembly 213 is movably inserted into the U-shaped frame 212. The movable frame 1 is also equipped with a drive assembly for driving the sliding blocks 210 to move. The support assembly 213 adapts to the areas on both sides of the casting hole and supports the movable frame 1. The drive assembly ensures that the axis of the pneumatic probe 20 is collinear with the axis of the casting hole.

[0034] like Figure 1 As shown, the movable frame 1 is equipped with a fixed angle group 24 for controlling the circumferential angle of the pneumatic probe 20, and the sliding block 210 is equipped with a fixed distance group 23 for controlling the distance between the movable frame 1 and the U-shaped frame 212. The fixed distance group 23 is used to measure the inner diameter of different height areas in the casting hole, and the fixed angle group 24 is used to measure the inner diameter of the same height area in the casting hole.

[0035] It should be noted that the pneumatic probe 20 is connected to the air source system, the conversion system, and the display system. In operation, the air source system provides a stable airflow, which is then ejected through the pneumatic probe 20. The pneumatic probe 20 detects the changes in airflow (pressure) caused by the change in the spacing between the inner walls of the casting holes. The changes are then converted and amplified by the conversion system, and finally the measurement results are displayed by the display system. All of the above structures are existing technologies and are not shown except for the pneumatic probe 20. They will not be described in detail hereafter.

[0036] During operation, firstly, select the corresponding support component 213 according to the characteristics around the corresponding casting hole, and insert the support component 213 into the corresponding U-shaped frame 212. Then, manually hold the handle and move the moving frame 1 above the casting hole. At the same time, indirectly adjust the position of the support component 213 through the drive group, and continuously move the moving frame 1 so that the support component 213 fits against the outer wall of the casting hole, providing support for the moving frame 1 and the pneumatic probe 20. At the same time, make the downward axis of the pneumatic probe 20 collinear with the axis of the casting hole, and prevent the pneumatic probe 20 from contacting the inner wall of the casting hole, so as to avoid the measured plane deviating from the required measurement plane due to the axis of the pneumatic probe 20 deviating from the axis of the casting hole.

[0037] The distance-fixing group 23 operates, causing the moving frame 1 and the pneumatic probe 20 to gradually move down a set distance and then stop moving. This allows the pneumatic probe 20 to move down to a specified height within the casting hole. The pneumatic probe 20 then performs an inner diameter measurement at this height. Simultaneously, the angle-fixing group 24 operates, causing the pneumatic probe 20 to rotate at equal angles and perform an inner diameter measurement after rotation. In summary, the angle-fixing group 24 performs an inner diameter measurement on the same height plane at different angle positions. Afterward, the distance-fixing group 23 operates again, causing the pneumatic probe 20 to move to the next measurement height, and the above process is repeated to measure the inner diameter.

[0038] In summary, multiple inner diameter measurements were performed at different angles within several defined height planes. The obtained data were analyzed to determine the inner diameter of the casting hole, thereby reducing errors in the measurement process and improving measurement accuracy.

[0039] like Figure 2 As shown, the drive assembly includes a bidirectional threaded rod 214. Two bidirectional threaded rods 214, distributed front to back and with their axes extending from left to right, are rotatably mounted on the moving frame 1. The bidirectional threaded rods 214 pass through the sliding block 210 and are threadedly engaged with the sliding block 210. The bidirectional threaded rods 214 are connected to an external motor (not shown in the figure).

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, the support unit 21 also includes insertion holes. Two symmetrical insertion holes are opened through the U-shaped frame 212 from left to right. Insertion pins 216 are movably inserted into the insertion holes, and locking pins 217 are inserted and installed on the insertion pins 216.

[0041] As an embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the support assembly 213 includes a support plate 2130, with the support plate 2130 fixedly mounted on two plug-in posts 216 on the same side, and a positioning post 2131 fixedly mounted on the lower end face of the support plate 2130.

[0042] When the upper part of the casting hole is a mounting panel for installing and connecting other components, and the mounting panel is provided with mounting through holes for subsequent installation and connection of other components, before measurement, the two corresponding plug-in pins 216 on the support plate 2130 are manually inserted into the corresponding plug-in holes, and the corresponding locking pins 217 are installed to lock the plug-in pins 216, thus completing the installation process of the support plate 2130.

[0043] Next, the moving frame 1 is moved above the casting hole. The external motor drives the bidirectional threaded rod 214 to rotate. Through the threaded engagement between the bidirectional threaded rod 214 and the sliding block 210, the two sliding blocks 210 move in opposite directions. The sliding blocks 210 indirectly drive the support plate 2130 to move synchronously, so that the positioning pin 2131 on the support frame 2132 moves directly above the corresponding mounting through hole. Then, the moving frame 1 is manually lowered so that the positioning pin 2131 is engaged in the corresponding mounting through hole. The external motor continues to work so that the two sliding blocks 210 move away from each other. The sliding blocks 210 drive the two positioning pins 2131 to move away from each other through the support plate 2130. Through the engagement between the two positioning pins 2131 and the inner wall of the corresponding mounting through hole, the axis of the pneumatic probe 20 is collinear with the axis of the casting hole. At the same time, the support plate 2130 provides support for the moving frame 1 and the pneumatic probe 20.

[0044] As a second embodiment of the present invention, such as Figure 1 and Figure 5 As shown, the support assembly 213 includes a support frame 2132. A T-shaped support frame 2132 is provided on two plug-in posts 216 on the same side. When the vertical section of the support frame 2132 is in contact with the outer side of the casting hole area, the horizontal section of the support frame 2132 abuts against the upper end of the casting hole.

[0045] When the features around the casting hole are cylindrical, before measurement, the two plug-in pins 216 corresponding to the support frame 2132 are manually inserted into the corresponding plug-in holes, and the corresponding locking pins 217 are installed to lock the plug-in pins 216, thus completing the installation process of the support frame 2132.

[0046] Next, the movable frame 1 is moved above the casting hole. The external motor drives the bidirectional threaded rod 214 to rotate. Through the threaded engagement between the bidirectional threaded rod 214 and the sliding block 210, the two sliding blocks 210 move closer to each other. The sliding blocks 210 indirectly drive the corresponding support frame 2132 to move synchronously, and the horizontal section of the support frame 2132 moves above the cylindrical structure. Then, the movable frame 1 is moved down, so that the horizontal section of the support frame 2132 fits against the upper side of the cylindrical structure, thereby providing support for the movable frame 1 and the pneumatic probe 20. Afterward, the external motor continues to operate, causing the sliding block 210 to hold... As the support frame continues to move, the vertical section of the support frame 2132 approaches the casting hole, and finally the vertical section of the support frame 2132 fits against the outer wall of the cylindrical structure. Through the process of the vertical sections of the left and right support frames 2132 fitting together, the axis of the pneumatic probe 20 is made collinear with the axis of the casting hole. This avoids the measurement plane from being different from the required measurement plane due to the downward direction of the pneumatic probe 20 (i.e., the direction of the axis of the pneumatic probe 20) deviating from the axis of the casting hole during the measurement process, which would affect the measurement accuracy. In addition, the horizontal section of the support frame 2132 does not contact the pneumatic probe 20, thus avoiding the problem of the support frame 2132 interfering with the measurement process of the pneumatic probe 20.

[0047] In summary, the support plate 2130 and support frame 2132 are adapted to the inner diameter measurement process of the casting hole at different positions in the pump body, ensuring that the axis and moving direction of the pneumatic probe 20 match the casting hole, while improving the universality of the device.

[0048] like Figure 1 , Figure 2 and Figure 5 As shown, the support unit 21 also includes a mounting frame 22. A U-shaped mounting frame 22 is fixedly mounted on the U-shaped frame 212, and the two U-shaped frames 212 are staggered front and back. An L-shaped frame 220 is movably inserted into the mounting frame 22. An arc-shaped bonding plate 221 is rotatably provided at the end of the L-shaped frame 220 away from the mounting frame 22. The two bonding plates 221 are symmetrically arranged on the left and right sides.

[0049] During the up-and-down movement of the movable frame 1, the stability during the measurement process is improved by using two left and right bonding plates 221 to bond with the outer wall around the casting hole.

[0050] like Figure 2 and Figure 5As shown, the L-shaped frame 220 has multiple mounting holes 222 arranged equidistantly from left to right on its transverse section. A vertically oriented pin 223 is movably inserted into the mounting frame 22. The mating plate 221 adapts to different mating requirements by engaging the mounting holes 222 with the pin 223 at different positions. It should be noted that both mating plates 221 have a rubber layer (not shown in the figure) on their inner arc surfaces. Therefore, as the mating plates 221 approach and press against the cylinder wall, the rubber layer deforms, ensuring a tight fit with the cylinder wall and adapting to the mating requirements of cylinder walls of different sizes.

[0051] like Figure 2 and Figure 5 As shown, when the two sliding blocks 210 approach each other, the bonding plate 221 is located between the casting hole and the corresponding U-shaped frame 212, which is suitable for the situation where the support frame 2132 abuts against each other. When the two sliding blocks 210 move away from each other, the casting hole is located between the bonding plate 221 and the corresponding U-shaped frame 212, which is suitable for the situation where the positioning pin 2131 is moved away from each other and positioned and clamped by the support plate 2130.

[0052] In Example 1, see Figure 2 In cases where the two sliding blocks 210 need to move away from each other, before measurement, the L-shaped frame 220 is manually installed into the U-shaped area of ​​the mounting frame 22, with the corresponding mounting hole 222 facing the pin 223. The L-shaped frame 220 is then installed by inserting the pin 223 into the corresponding mounting hole 222. The L-shaped frame 220 is manually rotated so that the two bonding plates 221 are rotated to the left and right sides of the casting hole respectively (it should be noted that rotating the L-shaped frame 220 improves the convenience of bonding plates 221 in the process of bonding with the workpiece and avoids the problem of mutual jamming). The bonding plate 221 on the right side of the L-shaped frame 220 is located to the left of the other bonding plate 221. Therefore, during the subsequent process of the two sliding blocks 210 moving away from each other, the two bonding plates 221 can press against the circumferential surface of the casting hole wall.

[0053] In Example 2, see Figure 5 When the two sliding blocks 210 need to be close to each other, before measurement, repeat the insertion and installation process of the L-shaped frame 220 in Embodiment 1, but make the bonding plate 221 on the right L-shaped frame 220 and the bonding plate 221 on the left L-shaped frame 220 located on the right and left sides of the casting hole, respectively. Therefore, during the subsequent process of the two sliding blocks 210 being close to each other, the two bonding plates 221 can abut against the outer circumferential surface of the casting hole wall.

[0054] In summary, by using two bonding plates 221 to bond with the wall of the casting hole, the bonding plates 221, L-shaped frame 220, U-shaped frame 212, mounting frame 22, support assembly 213 and moving frame 1 form a rectangular frame, which improves the stability of the pneumatic probe 20 during the up-and-down movement and measurement process and reduces the error of the obtained measurement data.

[0055] It should be further noted that the multiple mounting holes 222 are adapted to the measurement process of casting holes of different diameters, thereby improving the versatility of the device.

[0056] like Figure 1 and Figure 3 As shown, the fixed distance group 23 includes a slot 230. The circumferential surface of the rotating column 211 is provided with a plurality of slots 230 distributed at equal intervals from top to bottom. The side wall of the slot 230 is an arc-shaped surface. A limit rod 231 is movably arranged on the horizontal section of the U-shaped frame 212. A return spring 232 is provided between the limit rod 231 and the U-shaped frame 212.

[0057] An electric push rod 233 is provided in the U-shaped area of ​​the U-shaped frame 212. The telescopic end of the electric push rod 233 is rotatably connected to the rotating column 211. A servo motor for driving the rotating column 211 to rotate is provided on the sliding block 210.

[0058] During the measurement process, in the initial state, the limiting rod 231 is located in the lowest slot 230. At this time, the moving frame 1 is supported by the U-shaped frame 212, and the pneumatic probe 20 is at its highest measurement height. Then, the servo motor drives the rotating column 211 to rotate, and the inner wall of the slot 230 presses against the limiting rod 231, causing the limiting rod 231 to exit the corresponding slot 230. The return spring 232 is stretched, and then the electric push rod 233 works, causing its telescopic end to drive the rotating column 211 to move downward, so that the next slot... When slot 230 and limit rod 231 are at the corresponding height, the servo motor works to cause the rotating column 211 to reverse and reset. The limit rod 231 and the corresponding slot 230 are aligned again. The elastic force generated by the deformation of the reset spring 232 causes the limit rod 231 to re-enter the slot 230, thereby changing the vertical height of the pneumatic probe 20 and determining the required measurement height. The above operation is repeated to move the pneumatic probe 20 to different heights in the casting hole and to measure the hole diameter at each height.

[0059] like Figure 1 and Figure 4As shown, the fixed angle group 24 includes a control ring 240. The control ring 240 is fixedly installed on the upper end face of the movable frame 1. Multiple circumferentially distributed slots 241 are opened on the inner circumferential surface of the control ring 240. A locking rod 242 slides through the rotating shaft. A locking ball is fixedly installed at one end of the locking rod 242. A return spring 243 is fixedly installed between the other end of the locking rod 242 and the rotating shaft. The rotating shaft is connected to an external motor (not shown in the figure).

[0060] When the pneumatic probe 20 is at the required measurement height, in the initial state, the ball on the locking rod 242 is locked into the corresponding initial locking slot 241. After one measurement at this angle, the external motor drives the rotating shaft to rotate synchronously. The rotating shaft drives the locking rod 242 to rotate synchronously. The locking slot 241 squeezes the ball, and the ball moves out of the locking slot 241. The return spring 243 deforms. When the locking rod 242 moves to be opposite the next locking slot 241, the measurement angle of the pneumatic probe 20 is changed, that is, the measurement position of the pneumatic probe 20 changes. Under the elastic force generated by the deformation of the return spring 243, the ball is locked back into the corresponding locking slot 241, and the measurement operation is repeated. The above process is repeated to measure the inner diameter of the casting hole at different angles within the same height.

[0061] It should be noted that in existing technologies, measurements are typically performed by manually inserting a pneumatic probe 20 into the casting hole. This solution controls the pneumatic probe 20 to be collinear with the axis of the casting hole, to penetrate to the required measurement height at equal distances, and to perform variable angle measurements at the same height. This solves the problem that the change in distance between the pneumatic probe 20 and the inner wall of the casting hole affects the accuracy of the measurement results. Furthermore, this solution can perform multiple measurements in different areas of the casting hole, improving the accuracy of the measurement results. Compared to existing technologies, although this solution adds a support assembly 213, a fixed angle group 24, and a fixed distance group 23, these are all conventional mechanical components that require only a one-time investment for long-term use. Therefore, the cost of adding these structures is relatively low.

[0062] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0063] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for measuring the casting bore diameter of an engine pump body, characterized in that, include: A movable frame is provided with a measuring mechanism for measuring the inner diameter of a casting hole. The measuring mechanism includes a pneumatic probe. The pneumatic probe is rotatably mounted at the center of the movable frame via a rotating shaft. A support unit is also provided on the movable frame. The support unit not only supports the entire measuring mechanism but also ensures that the axis of the pneumatic probe is collinear with the axis of the inner diameter of the casting hole. The support unit includes a sliding block. Two symmetrical sliding blocks are slidably arranged on the movable frame. A rotating column with a vertical axis is rotatably arranged on the sliding block. A U-shaped frame located below the movable frame and with its opening facing downward is movably sleeved on the rotating column. A support component is movably inserted into the U-shaped frame. The movable frame is also provided with a drive group for driving the sliding blocks to move. The support assembly adapts to the areas on both sides of the casting hole and supports the movable frame. The drive group makes the axis of the pneumatic probe collinear with the inner diameter axis of the casting hole. The movable frame is equipped with a fixed angle group for controlling the circumferential angle of the pneumatic probe, and the sliding block is equipped with a fixed distance group for controlling the distance between the movable frame and the U-shaped frame. The fixed distance group is used to measure the inner diameter of different height areas in the casting hole, and the fixed angle group is used to measure the inner diameter of the same height area in the casting hole.

2. The engine pump body casting bore diameter measuring device according to claim 1, characterized in that: The drive assembly includes a bidirectional threaded rod. Two bidirectional threaded rods are rotatably mounted on the moving frame, distributed front to back and extending from left to right. The bidirectional threaded rods pass through the sliding block and are threadedly engaged with the sliding block.

3. The engine pump body casting bore diameter measuring device according to claim 1, characterized in that: The support unit also includes insertion holes. Two symmetrical insertion holes are opened through the left and right sides of the U-shaped frame. Insertion posts are movably inserted into the insertion holes, and locking pins are inserted and installed on the insertion posts.

4. The engine pump body casting bore diameter measuring device according to claim 3, characterized in that: The support assembly includes a support plate, with a support plate fixedly mounted on two plug-in posts on the same side, and a positioning post fixedly mounted on the lower end face of the support plate.

5. The engine pump body casting bore diameter measuring device according to claim 3, characterized in that: The support assembly includes a support frame, with a T-shaped support frame provided on two plug-in posts on the same side. When the vertical section of the support frame is in contact with the outer side of the casting hole area, the horizontal section of the support frame abuts against the upper end of the casting hole.

6. The engine pump body casting bore diameter measuring device according to claim 1, characterized in that: The support unit also includes a mounting frame. A U-shaped mounting bracket is fixedly mounted on the U-shaped frame, and the two U-shaped frames on the left and right are staggered. An L-shaped frame is movably inserted into the mounting frame. An arc-shaped bonding plate is rotatably set at the end of the L-shaped frame away from the mounting frame. The two bonding plates on the left and right are symmetrically arranged.

7. The engine pump body casting bore diameter measuring device according to claim 6, characterized in that: The L-shaped frame has multiple mounting holes arranged equidistantly from left to right on its transverse section, and a pin with a vertical axis is movably inserted into the mounting frame.

8. The engine pump body casting bore diameter measuring device according to claim 6, characterized in that: When the two sliding blocks are close to each other, the bonding plate is located between the casting hole and the corresponding U-shaped frame; when the two sliding blocks are far apart, the casting hole is located between the bonding plate and the corresponding U-shaped frame.

9. The engine pump body casting bore diameter measuring device according to claim 5, characterized in that: The fixed distance group includes a slot 1. Multiple slots 1 are equally distributed from top to bottom on the circumferential surface of the rotating column. The side wall of the slot 1 is an arc-shaped surface. A limit rod is movably installed on the horizontal section of the U-shaped frame. A return spring 1 is provided between the limit rod and the U-shaped frame. An electric push rod is provided within the U-shaped area of ​​the U-shaped frame, and the telescopic end of the electric push rod is rotatably connected to the rotating column.

10. The engine pump body casting bore diameter measuring device according to claim 1, characterized in that: The fixed angle assembly includes a control ring. The control ring is fixedly installed on the upper end face of the moving frame. Multiple circumferentially distributed slots are opened on the inner circumferential surface of the control ring. A locking rod slides through the rotating shaft. A locking ball is fixedly installed at one end of the locking rod. A return spring is fixedly installed between the other end of the locking rod and the rotating shaft.

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