An automated detection system for the inner diameter of a cylinder head

Abstract

The present invention provides an automatic detection system for the inner diameter of a cylinder head, which includes a measurement platform, a measurement device, a driving device, a positioning fixture and an articulated robot; the positioning fixture is fixed on the measurement platform and is used for positioning and placing the cylinder head to be measured thereon; the measurement device is located on one side of the positioning fixture and is detachably installed on the driving device and is used for measuring the size of the inner hole of the cylinder head to be measured; the driving device is installed on the measurement platform and is used for driving the measurement device to move on the measurement platform; the articulated robot is arranged on one side of the measurement platform, and a workpiece fixture is provided at the end of the articulated robot. The articulated robot clamps the cylinder head to be measured through the workpiece fixture and realizes the movement of the cylinder head to be measured. The present invention meets the design requirements of an automatic production line, eliminates manual operation, improves the accuracy of measurement results and reduces the detection cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection equipment, and particularly relates to an automatic detection system for the inner diameter of a cylinder head. Background Art

[0002] The cylinder head of a motorcycle engine usually needs to be finely bored, and after processing, it is also necessary to detect and record the processing conditions. The traditional processing is to first finely bore the cylinder head, then the operator manually takes it out, holds the pneumatic measuring head by hand to measure and record the processed cylinder head, and then judges the state of the tool according to the detection situation to replace the tool in time and reduce the defective output. Among them, due to the different techniques and habits of different personnel, the operation efficiency of processing and detection is very low, and the measurement results have large deviations.

[0003] With the investment in automation technology, an automatic production line is built. From the loading and unloading operations of the machine tool, to the connection between processes, and then to the quality monitoring of key processing processes, all are realized through H-shaped truss manipulators or articulated robots, and all processes are unmanned operations. However, on the one hand, the traditional detection means and operation methods for the fine boring of the engine cylinder head are all manually operated and cannot meet the design requirements of the automatic production line; on the other hand, pneumatic measurement has high requirements for operators. Different techniques and habits of different personnel and different measurement positions have a great impact on the measurement results, and the manual operation efficiency is low, increasing the labor intensity. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic detection system for the inner diameter of a cylinder head, which meets the design requirements of the automatic production line, eliminates the need for manual operation, improves the accuracy of measurement results, and reduces the detection cost.

[0005] The present invention is realized through the following technical solutions:

[0006] An automatic detection system for the inner diameter of a cylinder head includes a measurement platform, a measurement device, a driving device, a positioning fixture, and an articulated robot;

[0007] The positioning fixture is fixed on the measurement platform and is used for positioning the cylinder head to be measured placed thereon;

[0008] The measurement device is located on one side of the positioning fixture and is detachably installed on the driving device, and is used for measuring the size of the inner hole of the cylinder head to be measured;

[0009] The driving device is installed on the measurement platform and is used for driving the measurement device to move on the measurement platform;

[0010] The articulated robot is arranged on one side of the measurement platform. A workpiece fixture is provided at the end of the articulated robot. The articulated robot clamps the cylinder head to be measured through the workpiece fixture and realizes the movement of the cylinder head to be measured.

[0011] Further, the measuring device includes a pneumatic measuring head, a controller, a communication module, and a touch screen. The first end of the pneumatic measuring head is detachably mounted on the driving device;

[0012] Eight air outlet holes and four air inlet holes are provided on the pneumatic measuring head. Among them, the eight air outlet holes form four groups of air outlet hole groups with two as a group. The two air outlet holes in each group of air outlet hole groups are symmetrically arranged on both sides of the same longitudinal section of the pneumatic measuring head; among the four groups of air outlet hole groups, two groups of air outlet hole groups are arranged in the middle of the pneumatic measuring head, and the other two groups of air outlet hole groups are arranged at the second end of the pneumatic measuring head;

[0013] The four air inlet holes are arranged at a position close to the first end of the pneumatic measuring head and are all arranged on the same cross section of the pneumatic measuring head. The four air inlet holes correspond to the four groups of air outlet hole groups one by one. Any air inlet hole is communicated with the two air outlet holes of the corresponding air outlet hole group through an air duct;

[0014] Any air inlet hole is connected to the air source through a pneumatic-electric converter;

[0015] The controller is connected to the pneumatic-electric converter through the communication module;

[0016] The controller is respectively connected to the driving device, the touch screen, and the articulated robot.

[0017] Further, the four air inlet holes form two groups of air inlet hole groups with two as a group. Among them, the two air inlet holes in one group of air inlet hole groups correspond to the two groups of air outlet hole groups arranged in the middle of the pneumatic measuring head one by one, and the two air inlet holes in the other group of air inlet hole groups correspond to the two groups of air outlet hole groups arranged at the second end of the pneumatic measuring head one by one. Any air inlet hole and the two air outlet holes of the corresponding air outlet hole group are arranged on the same longitudinal section of the pneumatic measuring head, and the openings of the two air inlet holes in the same group of air inlet hole groups face perpendicular to each other.

[0018] Further, the driving device includes a mounting plate, a measuring fixture, a linear driving module, and an auxiliary slide rail. One end of the mounting plate is drivingly connected to the linear driving module, and the other end is slidably connected to the auxiliary slide rail. The measuring fixture is arranged on the mounting plate and is detachably connected to the pneumatic measuring head. The linear driving module and the auxiliary slide rail are both arranged on the measuring platform and are parallel to each other.

[0019] Further, a through hole is provided at the first end of the pneumatic measuring head. The measuring fixture includes a support plate, a sliding rod assembly, and a fixing bolt. One end of the sliding rod assembly is provided with an insertion hole for the first end of the pneumatic measuring head to be inserted. The other end is arranged on the support plate. A threaded hole corresponding to the through hole is provided on the side wall of the insertion hole. The first end of the pneumatic measuring head is inserted into the insertion hole of the sliding rod assembly and is fixed by screwing the fixing bolt into the threaded hole and the through hole.

[0020] Further, it further includes a warning device for giving warnings. The sliding rod assembly includes a fixed rod, a movable rod, a sensor and a first elastic member. The fixed rod is disposed through the support plate, and an accommodation cavity penetrating through both ends is provided inside thereof. An insertion hole is provided at one end of the movable rod, and the other end of the movable rod passes through the accommodation cavity of the fixed rod and is connected to the sensor. An induction head cooperating with the sensor is provided on the support plate. The first elastic member is sleeved outside the movable rod, one end thereof abuts against the movable rod, and the other end thereof abuts against the fixed rod. The controller is respectively connected to the sensor and the warning device.

[0021] Further, the positioning fixture is a zero-point positioning system, which includes a mother board and a daughter board cooperating with the mother board. The mother board is installed on the measuring platform. A first positioning pin corresponding to a plurality of positioning holes of the to-be-tested cylinder head one by one is provided on a side surface of the daughter board away from the mother board. The first positioning pin is in clearance fit with the corresponding positioning hole.

[0022] Further, an auxiliary pressing assembly is further provided at the end of the articulated robot. The auxiliary pressing member includes a fixed plate, a movable plate and a second elastic member. The fixed plate is fixed at the end of the articulated robot, and fixing columns are provided at both ends thereof. The lower ends of the fixing columns pass through the sliding plate and are connected with limiting members. The movable plate can move up and down along the fixing columns. A plurality of pressing members are detachably installed on the movable plate. The second elastic member is disposed between the fixed plate and the movable plate.

[0023] Further, a calibration ring gauge is further included. The calibration ring gauge is located on a side of the positioning fixture away from the measuring device and is fixed on the measuring platform.

[0024] Further, a transition platform is further included. The transition platform is disposed at one end of the measuring platform and is used for placing the to-be-tested cylinder head.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: Designed according to the automated production line and adapting to the design requirements of the automated production line. The articulated robot is used to clamp the to-be-tested cylinder head and place the to-be-tested cylinder head on the positioning fixture for positioning. The driving device drives the measuring device to move into the to-be-tested cylinder head to measure the size of the inner hole of the to-be-tested cylinder head. The whole process does not require manual operation, has a high degree of automation, high detection efficiency, saves test time, and can avoid unstable manual operation and the uncertainty of test results brought by manual techniques and habits, thereby improving the accuracy of measurement results and reducing the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the automated cylinder head inner diameter detection system of the present invention;

[0027] Figure 2 is another schematic structural diagram of the automated cylinder head inner diameter detection system of the present invention (the articulated robot is not shown);

[0028] Figure 3 Schematic connection diagram of the measuring device in the automatic cylinder head inner diameter detection system of the present invention;

[0029] Figure 4 Schematic structural diagram of the pneumatic measuring head in the automatic cylinder head inner diameter detection system of the present invention;

[0030] Figure 5 Cross-sectional view of the pneumatic measuring head and the measuring fixture in the automatic cylinder head inner diameter detection system of the present invention;

[0031] Figure 6 For the automatic cylinder head inner diameter detection system of the present invention Figure 2 Enlarged schematic view of area A;

[0032] Figure 7 Schematic structural diagram of the end of the articulated robot in the automatic cylinder head inner diameter detection system of the present invention.

[0033] In the figure, 1 - measuring platform, 2 - measuring device, 21 - pneumatic measuring head, 211 - air outlet hole, 212 - air inlet hole, 213 - air duct, 214 - through hole, 22 - pneumatic-electric converter, 23 - air source, 3 - driving device, 31 - mounting plate, 32 - measuring fixture, 321 - support plate, 3211 - induction head, 322 - fixing bolt, 323 - fixing rod, 324 - movable rod, 325 - sensor, 326 - first elastic member, 327 - threaded hole, 33 - linear driving module, 34 - auxiliary slide rail, 4 - positioning fixture, 41 - mother board, 42 - daughter board, 421 - first positioning pin, 5 - articulated robot, 51 - workpiece fixture, 52 - fixing plate, 53 - movable plate, 54 - second elastic member, 55 - fixing column, 56 - pressing member, 57 - limiting member, 6 - calibration ring gauge, 7 - transition platform, 8 - cylinder head to be measured. Specific embodiments

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0036] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0039] Please refer to Figure 1 , Figure 1It is a schematic structural diagram of the automatic detection system for the inner diameter of the cylinder head of the present invention; an automatic detection system for the inner diameter of the cylinder head, comprising a measurement platform 1, a measurement device 2, a driving device 3, a positioning fixture 4 and an articulated robot 5; the positioning fixture 4 is fixed on the measurement platform 1 and is used for positioning and placing the cylinder head 8 to be measured thereon; the measurement device 2 is located on one side of the positioning fixture 4 and is detachably installed on the driving device 3 and is used for measuring the size of the inner hole of the cylinder head 8 to be measured; the driving device 3 is installed on the measurement platform 1 and is used for driving the measurement device 2 to move on the measurement platform 1; the articulated robot 5 is arranged on one side of the measurement platform 1, and a workpiece fixture 51 is provided at the end of the articulated robot 5. The articulated robot 5 clamps the cylinder head 8 to be measured through the workpiece fixture 51 and realizes the movement of the cylinder head 8 to be measured. The articulated robot 5 clamps the cylinder head 8 to be measured to the positioning fixture 4 through the workpiece fixture 51. The driving device 3 drives the measurement device 2 to insert into the two inner holes of the cylinder head 8 to be measured to detect the size of the inner hole of the cylinder head 8 to be measured. After the detection is completed, the articulated robot 5 clamps the cylinder head 8 to be measured that has been detected to the next process through the workpiece fixture 51.

[0040] Please refer to Figures 2 to 5 , Figure 2 which is another schematic structural diagram of the automatic detection system for the inner diameter of the cylinder head of the present invention (the articulated robot is not shown), Figure 3 which is a schematic connection diagram of the measurement device in the automatic detection system for the inner diameter of the cylinder head of the present invention, Figure 4 which is a schematic structural diagram of the pneumatic measuring head in the automatic detection system for the inner diameter of the cylinder head of the present invention, Figure 5This is a cross-sectional view of the pneumatic measuring head and the measuring fixture in the automatic inspection system for the inner diameter of the cylinder head of the present invention. The measuring device 2 includes a pneumatic measuring head 21, a controller (not shown in the figure), a communication module (not shown in the figure), and a touch screen (not shown in the figure). The first end of the pneumatic measuring head 21 is detachably installed on the driving device 3. There are eight air outlet holes 211 and four air inlet holes 212 on the pneumatic measuring head 21. Among them, the eight air outlet holes 211 form four groups of air outlet hole groups with two as a group. The two air outlet holes 211 in each group of air outlet hole groups are symmetrically arranged on both sides of the same longitudinal section of the pneumatic measuring head 21. Among the four groups of air outlet hole groups, two groups of air outlet hole groups are arranged in the middle of the pneumatic measuring head 21, and the other two groups of air outlet hole groups are arranged at the second end of the pneumatic measuring head 21. The four air inlet holes 212 are arranged at a position close to the first end of the pneumatic measuring head 21 and are all arranged on the same cross-section of the pneumatic measuring head 21. The four air inlet holes 212 correspond to the four groups of air outlet hole groups one by one. Any air inlet hole 212 is connected to the two air outlet holes 211 of the corresponding air outlet hole group through an air passage 213. Any air inlet hole 212 is connected to the air source 23 through an air-electric converter 22. The controller is connected to the air-electric converter 22 through the communication module. The controller is respectively connected to the driving device 3, the touch screen, and the articulated robot 5. The inner holes to be detected in the motorcycle cylinder head are generally camshaft holes. There are two camshaft holes in the cylinder head, and the sizes of the two camshaft holes are φ26.01±0.01 and φ37.044±0.01 respectively. In order to detect the sizes of the two camshaft holes of φ26.01±0.01 and φ37.044±0.01 simultaneously, eight air outlet holes 211 and four air inlet holes 212 are provided on the pneumatic measuring head 21. Among them, the eight air outlet holes 211 form four groups of air outlet hole groups with two as a group. The two air outlet holes 211 in each group of air outlet hole groups are interconnected. Among the four groups of air outlet hole groups, two groups of air outlet hole groups are arranged in the middle of the pneumatic measuring head 21 and are used to measure the camshaft hole of φ37.044±0.01 when the pneumatic measuring head 21 is inserted into the cylinder head 8 to be measured. The other two groups of air outlet hole groups are arranged at the second end of the pneumatic measuring head 21 and are used to measure the camshaft hole of φ26.01±0.01 when the pneumatic measuring head 21 is inserted into the cylinder head 8 to be measured. The air passage 213 is arranged inside the pneumatic measuring head 21 and is annularly distributed with the central axis of the pneumatic measuring head 21 as the reference. The output end of the air-electric converter 22 is connected to the corresponding air inlet hole 212. Specifically, a connector is provided on the air inlet hole 212, and the air inlet hole 212 is connected to the corresponding air-electric converter 22 through the connector. The input end of the air-electric converter 22 is connected to the air source 23. Preferably, an electric switch is provided between the output end of the air source 23 and the input end of the starting conversion module. Preferably, a pressure regulating valve is provided at the output end of the air source 23. The controller can be a PLC (programmable logic controller) and is used to control the movement positions of the linear drive module 33 in the driving device 3 and the movement positions of the articulated robot 5, and process the data sent by the communication module.During the working process, the pneumatic-electric converter 22 sends the read air flow rate to the controller through the communication module. The controller processes the air flow rate to obtain the dimensional data of the two camshaft holes of the cylinder head 8 to be measured, and then displays it on the touch screen. The operator confirms the state of the equipment tool for machining the holes according to the dimensional data of the two camshaft holes of the cylinder head 8 to be measured displayed on the touch screen. At the same time, the touch screen also serves as a human-machine interaction interface for human-machine interaction. In an embodiment, the second end of the pneumatic measuring head 21 extends radially outward to form a first extension portion, and the middle portion of the pneumatic measuring head 21 extends radially outward to form a second extension portion. The two ends of the first extension portion and the second extension portion are respectively chamfered. Two of the four air outlet hole groups are arranged on the first extension portion, and the other two air outlet hole groups are arranged on the second extension portion. By designing the first extension portion and the second extension portion, when the pneumatic measuring head 21 is inserted into the two camshaft holes of the cylinder head 8 to be measured, it can contact the cylinder head 8 to be measured through the first extension portion and the second extension portion, and correct the position of the cylinder head 8 to be measured to ensure that the coaxiality between the two camshaft holes and the pneumatic measuring head 21 is within the error range.

[0041] In an embodiment, the four intake holes 212 form two intake hole groups in groups of two. Two intake holes 212 of one intake hole group correspond one-to-one to the two air outlet hole groups arranged in the middle of the pneumatic measuring head 21, and two intake holes 212 of the other intake hole group correspond one-to-one to the two air outlet hole groups arranged at the second end of the pneumatic measuring head 21. Any intake hole 212 and the two air outlet holes 211 of the corresponding air outlet hole group are arranged on the same longitudinal section of the pneumatic measuring head 21. The openings of the two intake holes 212 in the same intake hole group face perpendicular to each other. Since the openings of the two intake holes 212 in the same intake hole group face perpendicular to each other, the four air outlet holes 211 corresponding to the two intake holes 212 in the same intake hole group are equidistantly arranged in the circumferential direction of the same cross section of the pneumatic measuring head 21, which makes the detection result more accurate when detecting the two camshaft holes of the cylinder head 8 to be measured.

[0042] The driving device 3 includes a mounting plate 31, a measuring fixture 32, a linear driving module 33 and an auxiliary slide rail 34. One end of the mounting plate 31 is drivingly connected to the linear driving module 33, and the other end is slidably connected to the auxiliary slide rail 34. The measuring fixture 32 is arranged on the mounting plate 31 and is detachably connected to the pneumatic measuring head 21. Both the linear driving module 33 and the auxiliary slide rail 34 are arranged on the measuring platform 1 and are parallel to each other. The linear driving module 33 drives the mounting plate 31 to move, and the mounting plate 31 drives the measuring device 2 to move on the measuring platform 1 through the measuring fixture 32, so that the pneumatic measuring head 21 of the measuring fixture 32 is inserted into two camshaft holes of the cylinder head 8 to be measured. The auxiliary slide rail 34 is designed to be parallel to the linear driving module 33 to ensure the stability of the movement of the mounting plate 31. In an embodiment, a through hole 214 is provided at the first end of the pneumatic measuring head 21. The measuring fixture 32 includes a support plate 321, a sliding rod assembly and a fixing bolt 322. One end of the sliding rod assembly is provided with an insertion hole for the first end of the pneumatic measuring head 21 to be inserted, and the other end is arranged on the support plate 321. A threaded hole 327 corresponding to the through hole 214 is provided on the side wall of the insertion hole. The first end of the pneumatic measuring head 21 is inserted into the insertion hole of the sliding rod assembly and is fixed by screwing the fixing bolt 322 into the threaded hole 327 and the through hole 214, so that the first end of the pneumatic measuring head 21 is detachably mounted on the sliding rod assembly. The pneumatic measuring head 21 and the sliding rod assembly are designed to be detachably mounted, which is convenient for replacing the pneumatic measuring head 21. If it is necessary to measure the inner hole of other workpieces in the future, only the corresponding pneumatic measuring head 21 needs to be replaced. In an embodiment, the through hole 214 is a tapered hole. The fixing bolt 322 includes a tapered portion that cooperates with the tapered hole and a threaded portion that is threadedly engaged with the threaded hole 327. By adjusting the position of the threaded portion in the threaded hole 327, the tapered portion is inserted into the tapered hole.

[0043] In one embodiment, the automated cylinder head inner diameter detection system of the present invention further includes a warning device (not shown in the figure) for giving warnings. The sliding rod assembly includes a fixed rod 323, a movable rod 324, a sensor 325, and a first elastic member 326. The fixed rod 323 is disposed through the support plate 321, and a receiving cavity penetrating both ends is provided inside it. An insertion hole is provided at one end of the movable rod 324, and the other end of the movable rod 324 passes through the receiving cavity of the fixed rod 323 and is connected to the sensor 325. An induction head 3211 cooperating with the sensor 325 is provided on the support plate 321. The first elastic member 326 is sleeved outside the movable rod 324, one end of which abuts against the movable rod 324, and the other end abuts against the fixed rod 323. The controller is respectively connected to the sensor 325 and the warning device. When the linear drive module 33 drives the pneumatic measuring head 21 to move towards the cylinder head 8 to be measured through the mounting plate 31, considering that the pneumatic measuring head 21 may not be coaxial with the two camshaft holes of the cylinder head 8 to be measured, and the pneumatic measuring head 21 cannot be inserted into the two camshaft holes of the cylinder head 8 to be measured. Under the blockage of the cylinder head 8 to be measured, the pneumatic measuring head 21 overcomes the elastic force of the first elastic member 326 and moves towards the support plate 321, resulting in the separation of the sensor 325 from the induction head 3211. At this time, the sensor 325 sends a warning signal to the controller, and the controller controls the warning device to give a warning to remind the operator to adjust. Thus, this setting can prevent the pneumatic measuring head 21 from continuously moving towards the cylinder head 8 to be measured by the linear drive module 33 through the mounting plate 31 when it cannot be inserted into the two camshaft holes of the cylinder head 8 to be measured, resulting in damage to the pneumatic measuring head 21. At the same time, a warning can be given through the warning device to remind the operator to adjust. Meanwhile, in this embodiment, in addition to controlling the warning device to give a warning according to the warning signal sent by the sensor 325, after the controller obtains the size data of the two camshaft holes of the cylinder head 8 to be measured, it will respectively compare the size data of the two camshaft holes of the cylinder head 8 to be measured with the preset size data of the two camshaft holes stored in advance to determine whether the size data of the two camshaft holes of the cylinder head 8 to be measured is qualified. If it is determined that the size data of the two camshaft holes of the cylinder head 8 to be measured is unqualified, the warning device will also be controlled to give a warning to remind the operator to check whether it is a size problem or the pneumatic measuring head 21 cannot be inserted into the two camshaft holes of the cylinder head 8 to be measured. If it is determined that the size data of the two camshaft holes of the cylinder head 8 to be measured is qualified, the warning device will not be controlled to start. Preferably, the warning device includes a flashing light and a buzzer. Preferably, the first elastic member 326 is a spring.

[0044] Please refer to Figure 6 , Figure 6 which is the Figure 2Schematic enlarged view of area A. In one embodiment, the positioning fixture 4 is a zero-point positioning system, which includes a mother board 41 and a daughter board 42 that cooperates with the mother board 41. The mother board 41 is installed on the measuring platform 1. On one side of the daughter board 42 away from the mother board 41, there are first positioning pins 421 corresponding one by one to several positioning holes of the cylinder head 8 to be measured. The first positioning pins 421 are in clearance fit with the corresponding positioning holes. The cooperation structure of the mother board 41 and the daughter board 42 is as follows: There is a locking device on the mother board 41, and on one side of the daughter board 42 away from the first positioning pins 421, there are locking pins that cooperate with the locking device. The locking pins on the daughter board 42 are automatically positioned after extending into the locking device of the mother board 41 and are locked by the locking module in the locking device. Since the measured features of the cylinder heads 8 to be measured of different models are the same, that is, the features of the two camshaft holes in all cylinder heads 8 to be measured are consistent. The difference lies in the positions of the positioning holes of the cylinder head 8 to be measured and the height of the cylinder head. Through the zero-point positioning system, it is convenient to quickly replace different daughter boards 42 and ensure the accuracy requirements. The lengths of the first positioning pins 421 on different daughter boards 42 are for the cylinder heads 8 to be measured of different models. By replacing different daughter boards 42 to correspond to all cylinder heads 8 to be measured, when the cylinder heads 8 to be measured of different models are placed on the positioning fixture 4, the two camshaft holes of the cylinder head 8 to be measured are in the same position, so that the pneumatic measuring head 21 can be inserted into the two camshaft holes of the cylinder head 8 to be measured for pneumatic detection. The clearance fit between the first positioning pins 421 and the corresponding positioning holes is to enable the airflow ejected from the air outlet holes 211 of the pneumatic measuring head 21 to slightly adjust the position of the cylinder head 8 to be measured in the horizontal direction when the pneumatic measuring head 21 is inserted into the two camshaft holes of the cylinder head 8 to be measured, eliminate the error of the cylinder head 8 to be measured in the horizontal direction, and ensure that the coaxiality between the two camshaft holes and the pneumatic measuring head 21 is within the error range. In this embodiment, when the warning device issues a warning and the operator finds during troubleshooting that the pneumatic measuring head 21 cannot be inserted into the two camshaft holes of the cylinder head 8 to be measured, the corresponding daughter board 42 can be replaced so that the pneumatic measuring head 21 can be inserted into the two camshaft holes of the cylinder head 8 to be measured for pneumatic detection.

[0045] Please refer to Figure 7 , Figure 7This is a schematic structural diagram of the end of the articulated robot in the automatic inspection system for the inner diameter of the cylinder head of the present invention. In one embodiment, an auxiliary pressing assembly is further provided at the end of the articulated robot 5. The auxiliary pressing component includes a fixing plate 52, a movable plate 53, and a second elastic member 54. The fixing plate 52 is fixed to the end of the articulated robot 5, and fixing columns 55 are provided at both ends thereof. The lower ends of the fixing columns 55 pass through the sliding plate and are connected with limiting members 57. The movable plate 53 can move up and down along the fixing columns 55. A plurality of pressing members 56 are detachably installed on the movable plate 53. The second elastic member 54 is disposed between the fixing plate 52 and the movable plate 53. The limiting member 57 can be a limiting nut. Threads for threaded cooperation with the limiting nut are provided on the fixing column 55. By threading the limiting nut with the fixing column 55, the movable plate 53 is limited to prevent the movable plate 53 from falling off the fixing column 55. When the pneumatic measuring head 21 is inserted into the two camshaft holes of the cylinder head 8 to be measured, the top of the cylinder head 8 to be measured is pressed by the pressing members 56 on the movable plate 53. Since the second elastic member 54 is provided between the movable plate 53 and the fixing plate 52, under the action of the airflow ejected from the air outlet 211 of the pneumatic measuring head 21, the cylinder head 8 to be measured can move slightly in the vertical direction when overcoming the elastic force of the second elastic member 54, eliminating the error of the cylinder head 8 to be measured in the vertical direction, and further ensuring that the coaxiality between the two camshaft holes of the cylinder head 8 to be measured and the pneumatic measuring head 21 is within the error range. In one embodiment, the second elastic member 54 is a spring. The number of the springs is two. The two springs are respectively sleeved outside the two fixing columns 55, and their two ends are respectively abutted against the fixing plate 52 and the movable plate 53. Specifically, the pressing member 56 is integrally cylindrical, and its lower end forms a truncated cone shape.

[0046] In one embodiment, the automated cylinder head inner diameter detection system of the present invention further includes a calibration ring gauge 6. The calibration ring gauge 6 is located on the side of the positioning fixture 4 away from the measuring device 2 and is fixed on the measuring platform 1. The calibration ring gauge 6 is integrated into the automated cylinder head inner diameter detection system of the present invention. Thus, at the beginning of the initial detection of the automated cylinder head inner diameter detection system of the present invention, the pneumatic measuring head 21 can be first moved into the calibration ring gauge 6, and the measurement magnification is determined through the calibration of the calibration ring gauge 6. Or after the automated cylinder head inner diameter detection system of the present invention detects dozens of cylinder heads 8 to be measured, the pneumatic measuring head 21 can be moved into the calibration ring gauge 6, and the measurement magnification is determined again through the calibration of the calibration ring gauge 6 to ensure the accuracy of the measurement results. The calibration ring gauge 6 includes a first upper limit ring gauge, a first lower limit ring gauge, a second upper limit ring gauge, and a second lower limit ring gauge connected in sequence, and can simultaneously determine the measurement magnification of the two camshaft holes of the cylinder head 8 to be measured. The specific process is as follows: When the pneumatic measuring head 21 is inserted into the calibration ring gauge 6, its second end air outlet 211 is located within the first upper limit ring gauge, and its middle air outlet 211 is located within the second upper limit ring gauge. Record the flow value of the first upper limit ring gauge as Fl1, and record the flow value of the second upper limit ring gauge as Fl2. Then move the pneumatic measuring head 21 so that the second end air outlet 211 of the pneumatic measuring head 21 is located within the first lower limit ring gauge, and its middle air outlet 211 is located within the second lower limit ring gauge. Record the flow value of the first lower limit ring gauge as Fl3, and record the flow value of the second lower limit ring gauge as Fl4. Since the inner diameters Da of the first upper limit ring gauge, Db of the first lower limit ring gauge, Dc of the second upper limit ring gauge, and Dd of the second lower limit ring gauge are known, according to (Fl1 - Fl3) / (Da - Db) = Dfl1, the unit size flow Dfl1 is obtained, that is, the measurement magnification determined by the first upper limit ring gauge and the first lower limit ring gauge. According to (Fl2 - Fl4) / (Dc - Dd) = Dfl2, the unit size flow Dfl2 is obtained, that is, the measurement magnification determined by the second upper limit ring gauge and the second lower limit ring gauge.

[0047] In one embodiment, the automated cylinder head inner diameter detection system of the present invention further includes a transition platform 7. The transition platform 7 is arranged at one end of the measurement platform 1 and is used to place the cylinder head 8 to be measured. Since the cylinder head 8 to be measured needs to be cleaned after precision boring, the temperature of the cylinder head 8 to be measured will rise after cleaning. Therefore, the transition platform 7 is provided. Multiple cylinder heads 8 to be measured can be placed on the transition platform 7, and the cylinder heads 8 to be measured can be cooled on the transition platform 7. The articulated robot 5 picks up the cylinder heads 8 to be measured in the order in which they are placed on the transition platform 7. It picks up the cylinder head 8 to be measured placed on the transition platform 7 through the workpiece fixture 51 and places the picked-up cylinder head 8 on the positioning fixture 4. In one embodiment, a number of second positioning pin groups are equidistantly arranged on the transition platform 7. Each second positioning pin group includes two second positioning pins arranged at intervals. The first positioning pin 421 cooperates with the positioning hole of the cylinder head to accurately position the position of the cylinder head 8 to be measured placed on the transition platform 7, facilitating the articulated robot 5 to pick up the cylinder head 8 to be measured placed on the transition platform 7.

[0048] The working process of the present utility model is as follows: Initially, the linear drive module 33 of the drive device 3 drives the mounting plate 31, driving the pneumatic measuring head 21 to insert into the calibration ring gauge 6. The two measurement magnification factors Dfl1 and Dfl2 are obtained through measurement by the calibration ring gauge 6. Then, in the order in which the cylinder heads 8 to be measured are placed on the transition platform 7, the articulated robot 5 picks up the corresponding cylinder heads 8 to be measured on the transition platform 7, moves the picked-up cylinder heads 8 from the transition platform 7 to the position of the positioning fixture 4, places the cylinder heads 8 to be measured on the positioning fixture 4, and the positioning fixture 4 performs positioning. At the same time, the auxiliary pressing component of the articulated robot 5 presses on the top of the cylinder head 8 to be measured. Then, the linear drive module 33 of the drive device 3 drives the mounting plate 31 to move, thereby inserting the pneumatic measuring head 21 into the two camshaft holes of the cylinder head 8 to be measured. After the air pressure stabilizes, the four pneumatic-electric transducers 22 start reading the flow rate, and send the flow rate readings to the PLC through the communication module. The PLC obtains the flow rate Fl5 at the second end air outlet 211 of the pneumatic measuring head 21 and the flow rate Fl6 at the middle air outlet 211 of the pneumatic measuring head 21. The PLC processes the flow rate readings, and through the formulas Fl5*Dfl1 + Db = D1 and Fl6*Dfl2 + Dd = D2, obtains the size data D1 and D2 of the two camshaft holes. Then, the size data of the two camshaft holes are displayed on the touch screen, and the operator confirms the state of the equipment tool for machining the two camshaft holes of the cylinder head to be measured according to the size data of the two camshaft holes displayed on the touch screen.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows: designed according to the automated production line and adapted to the design requirements of the automated production line, the articulated robot 5 is used to pick up the cylinder head 8 to be measured and place the cylinder head 8 to be measured on the positioning fixture 4 for positioning. The driving device 3 drives the measuring device 2 to move into the cylinder head 8 to be measured to measure the size of the camshaft hole of the cylinder head 8 to be measured. The whole process does not require manual operation, has a high degree of automation, high detection efficiency, saves test time, and can avoid unstable manual operation and the uncertainty of test results brought by manual techniques and habits, thereby improving the accuracy of measurement results and reducing the detection cost.

[0050] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An automated inspection system for the inner diameter of a cylinder head, characterized in that, It includes a measurement platform, a measuring device, a driving device, a positioning fixture, an articulated robot, and a warning device for giving warnings; The positioning fixture is fixed on the measurement platform and is used for positioning and placing the cylinder head to be measured thereon; The measuring device is located on one side of the positioning fixture and is detachably installed on the driving device, and is used for measuring the size of the inner hole of the cylinder head to be measured; The driving device is installed on the measurement platform and is used for driving the measuring device to move on the measurement platform; The articulated robot is arranged on one side of the measurement platform. A workpiece fixture is provided at the end of the articulated robot. The articulated robot clamps the cylinder head to be measured through the workpiece fixture and realizes the movement of the cylinder head to be measured; Among them, the measuring device includes a pneumatic measuring head, a controller, a communication module, and a touch screen. The first end of the pneumatic measuring head is detachably installed on the driving device; The driving device includes a mounting plate, a measuring fixture, a linear driving module, and an auxiliary slide rail. One end of the mounting plate is drivingly connected to the linear driving module, and the other end is slidably connected to the auxiliary slide rail. The linear driving module and the auxiliary slide rail are both arranged on the measurement platform and are parallel to each other; A through hole is provided at the first end of the pneumatic measuring head. The measuring fixture includes a support plate, a sliding rod assembly, and a fixing bolt. One end of the sliding rod assembly is provided with an insertion hole for inserting the first end of the pneumatic measuring head. The other end is arranged on the support plate. A threaded hole corresponding to the through hole is provided on the side wall of the insertion hole. The first end of the pneumatic measuring head is inserted into the insertion hole of the sliding rod assembly and is fixed by screwing the fixing bolt into the threaded hole and the through hole; The sliding rod assembly includes a fixed rod, a movable rod, a sensor, and a first elastic member. The fixed rod is arranged through the support plate, and an accommodating cavity penetrating through both ends is provided inside it. The insertion hole is provided at one end of the movable rod. The other end of the movable rod passes through the accommodating cavity of the fixed rod and is connected to the sensor. An induction head cooperating with the sensor is provided on the support plate. The first elastic member is sleeved outside the movable rod. One end of it abuts against the movable rod, and the other end abuts against the fixed rod. The controller is respectively connected to the sensor and the warning device; 2. The automated cylinder head inner diameter detection system according to claim 1, wherein Eight air outlet holes and four air inlet holes are provided on the pneumatic measuring head. Among them, the eight air outlet holes form four groups of air outlet hole groups with two as a group. The two air outlet holes in each group of air outlet hole groups are symmetrically arranged on both sides of the same longitudinal section of the pneumatic measuring head; among the four groups of air outlet hole groups, two groups of air outlet hole groups are arranged in the middle of the pneumatic measuring head, and the other two groups of air outlet hole groups are arranged at the second end of the pneumatic measuring head; The four air inlet holes are arranged at a position close to the first end of the pneumatic measuring head and are all arranged on the same cross section of the pneumatic measuring head. The four air inlet holes correspond to the four groups of air outlet hole groups one by one. Any one of the air inlet holes is communicated with the two air outlet holes of the corresponding air outlet hole group through an air passage; Any one of the air inlet holes is connected to the air source through a pneumatic-electric converter; The controller is connected to the pneumatic-electric converter through the communication module; The controller is respectively connected to the driving device, the touch screen, and the articulated robot; The four intake holes are formed into two groups of intake hole groups in pairs. Two intake holes of one group of intake hole groups correspond one by one to two groups of air outlet hole groups arranged in the middle of the pneumatic measuring head, and two intake holes of the other group of intake hole groups correspond one by one to two groups of air outlet hole groups arranged at the second end of the pneumatic measuring head. Any one of the intake holes and two air outlet holes of the corresponding air outlet hole group are arranged on the same longitudinal section of the pneumatic measuring head, and the openings of the two intake holes in the same group of intake hole groups face perpendicular to each other.

3. The automated cylinder head inner diameter detection system according to claim 1, characterized in that, The positioning fixture is a zero-point positioning system, which includes a mother board and a daughter board that cooperates with the mother board. The mother board is installed on the measuring platform. On the side of the daughter board away from the mother board, there are first positioning pins corresponding one by one to a plurality of positioning holes of the cylinder head to be measured, and the first positioning pins are in clearance fit with the corresponding positioning holes.

4. The automated cylinder head inner diameter detection system according to claim 1, characterized in that, An auxiliary pressing assembly is further provided at the end of the articulated robot. The auxiliary pressing component includes a fixing plate, a movable plate and a second elastic member. The fixing plate is fixed at the end of the articulated robot, and fixing columns are provided at both ends thereof. The lower ends of the fixing columns pass through the sliding plate and are connected with limiting members. The movable plate can move up and down along the fixing columns. A plurality of pressing members are detachably installed on the movable plate, and the second elastic member is arranged between the fixing plate and the movable plate.

5. The automated cylinder head inner diameter detection system according to claim 1, characterized in that, It further includes a calibration ring gauge, which is located on the side of the positioning fixture away from the measuring device and is fixed on the measuring platform.

6. The automated cylinder head inner diameter detection system according to claim 1, wherein It further includes a transition platform, which is arranged at one end of the measuring platform and is used for placing the cylinder head to be measured.

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