A quick measurement structure for an inner hole of an automobile die casting

Abstract

The present application relates to the technical field of automobile die casting inner hole size measurement, and particularly relates to a quick measurement structure for automobile die casting inner hole, which comprises a handle, a display device, a measuring head, a centering assembly and a measuring claw assembly. The present application solves the problem of traditional plug gauge "inserting and wearing" by combining the "floating centering" with the "radial trigger measurement". In the key centering stage, the measuring head is in contact with the outer cylindrical surface and the hole wall throughout the process without contact, and relies on the geometric constraint of the centering contact uniformly distributed on the circumference and the space inclined guide rail to realize self-adaptive precise centering, so as to completely isolate the axial sliding friction which causes the wear of the measuring head body and the scratch of the hole wall in the traditional way. In the measurement execution stage, the hard alloy measuring claw is radially extended from the inside of the measuring head which has completed centering and is rigidly locked, and only makes instantaneous contact with the hole wall with a controlled constant force, completely avoiding the destructive path of traditional way that the outer wall of the measuring head scratches along the hole wall throughout the process.

Description

Technical Field

[0001] This invention relates to the field of measuring the internal diameter of automotive die-cast parts, and in particular to a rapid measurement structure for the internal diameter of automotive die-cast parts. Background Technology

[0002] In the automotive manufacturing industry, especially in the large-scale production of powertrain components (such as engine blocks, cylinder heads, and transmission housings) and structural parts, die-cast parts made of lightweight materials such as aluminum alloys and magnesium alloys are widely used. These die-cast parts typically have numerous high-precision mating holes, bearing holes, or oil passage holes, and the diameter and shape accuracy of these holes directly affect the assembly performance, sealing performance, and operational reliability of the components. Therefore, rapid, accurate, and efficient full inspection of these internal holes on the production line is a crucial step in ensuring product quality and production cycle time.

[0003] Currently, for rapid on-site measurement of this type of bore, the industry commonly uses mechanical dial gauges (go / no-go gauges) or electronic digital gauges. However, with the increasing demands of the modern automotive industry for production efficiency, measurement accuracy, and zero defects, the aforementioned traditional measurement methods are increasingly revealing the following inherent and insurmountable shortcomings:

[0004] 1. Irreversible wear between the probe and the workpiece: During each measurement, the outer cylindrical surface of the plug gauge probe must undergo axial, full-range sliding friction with the entire hole wall. With thousands of pieces produced daily and subjected to high-frequency inspections, this continuous friction causes the probe diameter to gradually decrease, potentially leading to out-of-roundness and systematic drift in its calibration values. To ensure the accuracy of the measurement reference, frequent periodic calibration or replacement is necessary, increasing operating costs and introducing quality risks due to "accuracy issues" during the calibration cycle. Furthermore, the hard probe is highly susceptible to scratches, roughening, and even peeling on the softer aluminum alloy die-cast hole walls during insertion and removal.

[0005] 2. Measurement accuracy is greatly affected by the operator. The measurement accuracy of traditional plug gauges is highly dependent on the operator's skill and consistency. During measurement, the operator must manually align the plug gauge axis with the hole axis. If there is a significant tilt, the outer wall of the plug gauge will interfere with or make one-sided contact with the hole, resulting in serious distortion of the measurement value or failure to insert it at all.

[0006] To fundamentally solve the problems of probe wear, workpiece scratches, and measurement accuracy dependence on operator skill, this invention provides a rapid measurement structure for the inner hole of automotive die-cast parts based on the principle of adaptive floating centering and radial triggering measurement. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a rapid measurement structure for the inner bore of automotive die-cast parts, which solves the problems mentioned in the background art.

[0008] To achieve the above objectives, the embodiments of this application provide the following technical solution: This invention provides a rapid measurement structure for the inner hole of automotive die-cast parts, including a handle, a display device, a probe, a centering assembly, and a measuring jaw assembly. The handle contains a signal processing module and a power module. The display device is detachably connected to the upper end of the handle and contains a display output module. The probe is detachably connected to the lower end of the handle, and its outer circumference is uniformly provided with guide grooves extending along its axis, with the guide grooves gradually inclined from top to bottom towards the probe's axis. The centering assembly includes contacts. The probe head includes a contact element and a locking element. The contact element is slidably disposed in each corresponding guide groove, and the locking element is disposed inside the probe head and located at the upper section of the guide groove. The locking element cooperates with the contact element, and when the contact element is at the uppermost end of the guide groove, the locking element locks the position of the contact element. The measuring claw assembly is evenly disposed inside the probe head and is located below the locking element. The measuring claw assembly and the centering assembly inside the probe head are staggered. A displacement sensor is disposed inside the measuring claw assembly. The displacement sensor, the signal processing module, and the display output module are all electrically connected to the power supply module.

[0009] In the process of measuring the inner hole of automotive die-cast parts, the first step is to establish a reference for the probe to extend into the inner hole for measurement by using a primary adaptive floating centering and rigid locking of the contact component. Then, under the rigid locking state, multiple measuring claw assemblies are driven to extend radially and synchronously from inside the probe and contact the hole wall to complete the auxiliary centering and synchronous measurement action at the lower end of the probe.

[0010] According to an advantageous embodiment, the contact element includes a right-angled trapezoidal centering contact, a guide post is provided inside the guide groove, the centering contact is movably sleeved on the outer wall of the guide post, a spring is sleeved on the outer wall of the guide post above the centering contact, a stepped groove is provided at the inclined side of the centering contact, a chamfer is provided at the position where the stepped groove connects to the inclined side, and a locking hole is provided at the end of the centering contact facing the probe axis.

[0011] According to an advantageous embodiment, a contact block is slidably disposed in the stepped groove, and the contact block is rolled between the groove wall of the stepped groove. A guide post is also disposed inside the groove wall of the stepped groove, and the guide post is movably disposed between the guide post and the contact block. The contact block is located in the middle of the guide post, and springs are sleeved on the outer walls of the guide posts on both sides of the contact block. One end of the spring abuts against the outer wall of the contact block, and the other end abuts against the groove wall of the stepped groove.

[0012] According to an advantageous embodiment, the locking element includes a locking pin, which is movably disposed inside the probe at a position corresponding to the guide groove. A guide wedge is connected to one end of the locking pin near the probe axis. A return spring is sleeved on one end of the locking pin at the connection position with the guide wedge. The upper side of the guide wedge facing the probe axis is an inclined structure that approaches the probe axis from top to bottom, and the lower side is a vertical planar structure.

[0013] According to an advantageous embodiment, the measuring claw assembly includes an inner cylinder column, which is movably disposed inside the probe, and a telescopic spring is sleeved on the outer wall of the inner cylinder column. An arc-shaped push block is provided at one end of the inner cylinder column facing the probe axis, and a carbide measuring claw is threadedly connected to the other end of the inner cylinder column away from the probe axis.

[0014] According to an advantageous embodiment, the outer wall of the handle is evenly provided with three sets of limiting grooves, each limiting groove consisting of a vertical pressing section and an arc-shaped rotating section, with the rotating section connected to the lower end of the pressing section.

[0015] According to an advantageous embodiment, the outer wall of the handle is fitted with a pressing member, which consists of an annular sleeve fitted on the outer wall of the handle, a push rod evenly connected to the lower end of the annular sleeve, and an arc-shaped contact plate connected to the lower end of the push rod. The annular sleeve is also evenly provided with three sets of screw posts through a threaded connection. The ends of the screw posts are connected to balls, and the balls connected to the ends of the screw posts are located in a limiting groove.

[0016] According to an advantageous embodiment, the hole wall section of the lock hole is flared.

[0017] According to an advantageous embodiment, the displacement sensor is arranged vertically on the outer wall of the carbide measuring claw.

[0018] Compared with the prior art, the rapid measurement structure for the inner hole of automotive die-cast parts provided in this embodiment of the invention has the following beneficial effects:

[0019] 1. This invention, through the synergistic effect of a floating centering contact and a spatial inclined guide rail on the probe, transforms the axial displacement applied by the operator into the radial expansion motion of the centering contact, achieving non-contact adaptive precision alignment between the probe axis and the hole axis. Thus, during the measurement reference establishment stage, it completely eliminates the wear of the probe body and scratches on the hole wall caused by axial insertion friction in traditional plug gauges. During the measurement execution stage, the carbide probe claw extends radially and synchronously from the locked probe interior, achieving instantaneous and localized contact with the hole wall with controlled constant force. This completely avoids the destructive path of scraping the probe outer wall along the hole wall throughout the entire process in traditional measurements, achieving a long service life for the measuring tool and zero damage to the workpiece surface.

[0020] 2. During the use of this invention, the probe can automatically and quickly adjust its own axis to coincide with the axis of the hole to be measured, eliminating the centering error caused by human error. Through a one-button pressing operation, the probe is driven from a floating centering state supported by a spring to a rigid static centering state with a "pin-hole" fit, establishing an extremely stable reference for measurement. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the first position of the rapid measurement structure for the inner hole of the die-cast automotive part.

[0022] Figure 2 This is a three-dimensional structural diagram of the second position of the rapid measurement structure for the inner hole of the die-cast part of this automobile.

[0023] Figure 3 This is a partial sectional view of the main view of the rapid measurement structure for the inner hole of this automotive die-casting part.

[0024] Figure 4 For the present invention Figure 3 A magnified view of section A in the image.

[0025] Figure 5 This is a cross-sectional view of the internal structure of the probe of the present invention.

[0026] Figure 6 This is a state diagram for measuring the inner hole of an automotive die-casting part according to the present invention.

[0027] The reference numerals in the figure are as follows: 1. Handle; 11. Pressing section; 12. Rotating section; 13. Annular sleeve; 14. Push rod; 15. Arc-shaped contact plate; 16. Screw post; 2. Display device; 3. Probe; 31. Guide groove; 4. Centering assembly; 41. Contact element; 42. Locking element; 411. Centering contact; 412. Stepped groove; 413. Locking hole; 414. Contact block; 421. Locking pin; 422. Guide wedge block; 5. Measuring claw assembly; 51. Inner cylinder column; 52. Arc-shaped push block; 53. Carbide measuring claw. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail.

[0029] Please refer to the following: Figure 1 , Figure 2 and Figure 4A rapid measurement structure for the inner hole of automotive die-cast parts includes a handle 1, a display device 2, a probe 3, a centering assembly 4, and a measuring jaw assembly 5. The handle 1 houses a signal processing module and a power module, with the power module typically employing a rechargeable lithium battery. The display device 2 is detachably connected to the upper end of the handle 1 and contains a display output module. The probe 3 is detachably connected to the lower end of the handle 1. The outer circumference of the probe 3 is uniformly provided with guide grooves 31 extending along its axial direction, gradually tilting downwards towards the axis of the probe 3 to form a spatial inclined guide rail. The centering assembly 4 includes contact elements 4. 1. A locking element 42 and a contact element 41 are slidably disposed in each corresponding guide groove 31. The locking element 42 is disposed inside the probe 3 and located at the upper section of the guide groove 31. The locking element 42 cooperates with the contact element 41. When the contact element 41 is located at the uppermost end of the guide groove 31, the locking element 42 locks the position of the contact element 41. The measuring claw assembly 5 is evenly disposed inside the probe 3 and is located below the locking element 42. The measuring claw assembly 5 and the centering assembly 4 inside the probe 3 are staggered. The measuring claw assembly 5 is provided with a displacement sensor. The displacement sensor, the signal processing module, and the display output module are all electrically connected to the power supply module.

[0030] Before using this measuring structure to quickly measure the inner diameter of automotive die-cast parts, first, replace the probe 3 with a probe of the appropriate size according to the diameter of the hole. Then, the operator holds the handle 1 and inserts the probe 3 into the hole to be measured. During the insertion process, the centering component 4 first contacts the hole wall. As the probe 3 extends into the hole and cannot move further, the centering component 4 automatically corrects the alignment of the probe 3 with the axis of the hole. When the probe 3 reaches the point where it cannot move further into the hole, the locking component 42 locks the contact component 41 in the centering position on the probe 3. Locking is performed, and operation continues until the measuring claw assembly 5 extends out of the probe 3 and contacts the wall of the hole to be measured. The displacement sensor transmits the measurement data to the signal processing module as an electrical signal. After signal conditioning (including amplification, filtering, and linearization compensation), analog-to-digital conversion, and specific algorithm processing (nonlinear correction) by the signal processing module, accurate displacement information is extracted. The processed high-precision displacement data is finally presented on the LCD screen on the display output module. The displayed content is the real-time detection value, and the operator can read whether the detection value is within the error range.

[0031] See Figure 4 The contact element 41 includes a right-angled trapezoidal centering contact 411. A guide post is provided inside the guide groove 31. The centering contact 411 is movably sleeved on the outer wall of the guide post. A spring is sleeved on the outer wall of the guide post above the centering contact 411. A stepped groove 412 is provided at the inclined side of the centering contact 411. A chamfer is provided at the position where the stepped groove 412 connects to the inclined side.

[0032] As the operator holds handle 1 and inserts probe 3 into the hole to be tested, multiple centering contacts 411 on the periphery are quickly guided along their respective chamfered edges, positioning the stepped grooves 412 of the centering contacts 411 on the upper surface of the hole to be tested. Figure 6 As shown, as the probe 3 continues to extend into the hole to be tested, the centering contact 411 slides radially outward from the center along the radial direction of the probe 3 through the action of the spatial inclined guide rail. The continuous outward movement of the multiple centering contacts 411 quickly adjusts the probe 3 to coincide with the axis of the hole to be tested. It should be noted that during the process of inserting the probe 3 into the hole to be tested for centering, the centering contact 411 prevents the probe 3 from contacting the hole to be tested. During the entire process of the probe 3 extending into the hole to be tested, there is no contact or relative sliding between the outer cylindrical surface of the probe 3 and the wall of the hole to be tested, while the contact position of the centering contact 411 relative to the hole wall of the automotive die-casting part remains fixed. Thus, the movement state of the centering contact 411 relative to the probe 3 is floating on the outer wall of the hole opening. By setting the centering contact 411 to a floating working state, the mutual wear between the probe 3 and the hole wall caused by the direct insertion of the probe 3 in the traditional method is avoided.

[0033] It should also be noted that the spring stiffness fitted on the outer wall of the guide post above the centering contact 411 is small enough to ensure the "floating" sensitivity.

[0034] Continue reading Figure 4 To improve the smoothness of the movement of the probe 3 during the process of aligning its axis with the axis of the hole to be measured, a contact block 414 is slidably arranged in the stepped groove 412. The contact block 414 is rolled between the groove wall of the stepped groove 412. A guide post is also provided inside the groove wall of the stepped groove 412. The guide post is movably arranged between the guide post and the contact block 414. The contact block 414 is located in the middle of the guide post. Springs are sleeved on the outer walls of the guide posts on both sides of the contact block 414. One end of the spring abuts against the outer wall of the contact block 414, and the other end abuts against the groove wall of the stepped groove 412.

[0035] During the process of the operator holding the handle 1 and driving the probe 3 into the hole to be tested, after being guided by the chamfered edge of the centering contact 411, the contact block 414 will first contact the hole wall of the hole to be tested. Since the contact block 414 is located in the middle of the stepped groove 412, as the probe 3 continues to extend into the hole to be tested, the probe 3 will be displaced relative to the contact block 414. Because multiple contact blocks 414 are arranged around the probe 3, during the adjustment of the probe 3, they are subjected to the initial resistance force of each spring, so the axis of the probe 3 will be automatically centered with the axis of the hole to be tested. When the axis of the probe 3 coincides with the axis of the hole to be tested, the springs on the guide posts of all contact blocks 414 near the center of the probe 3 are in a state of extreme compression.

[0036] To further fix the position of the probe 3 after it is aligned with the central axis of the hole to be tested, and to prevent the probe 3 from shifting relative to the central axis again during the testing process, the present invention also provides a locking element 42, see reference. Figure 4 The locking component 42 includes a locking pin 421, which is movably disposed inside the probe 3 at a position corresponding to the guide groove 31. A guide wedge 422 is connected to one end of the locking pin 421 near the axis of the probe 3. A return spring is sleeved on one end of the locking pin 421 connected to the guide wedge 422. The upper side of the guide wedge 422 facing the axis of the probe 3 is an inclined structure that moves from top to bottom towards the axis of the probe 3, and the lower side is a vertical plane structure. A locking hole 413 is provided at one end of the centering contact 411 facing the axis of the probe 3. The hole wall section of the locking hole 413 is flared. The flared design guides the insertion of the locking pin 421, so that the locking pin 421 can be quickly inserted into the locking hole 413 to complete the locking work.

[0037] After the axis of probe 3 coincides with the axis of the hole to be measured, multiple locking pins 421 move synchronously away from the center line of probe 3 toward the locking hole 413 until they are all inserted into the locking hole 413, thus completing the position locking of probe 3. After locking, the system changes from a floating centering state supported by springs to a rigid static centering state guaranteed by the "pin-hole" cooperation. It should be noted that in the locked state, the springs on the guide post on the side of the contact block 414 near the center position of probe 3 are all in a state of extreme compression, so probe 3 will not be able to wobble again in this state. Probe 3 completes the first-level adaptive floating centering operation in the floating working state of the multiple centering contacts 411, which fully ensures that the upper position of probe 3 remains coaxial with the hole to be measured and avoids the position of probe 3 from shifting.

[0038] In order to simultaneously insert all the locking pins 421 into the lock holes 413 to complete the locking operation, refer to... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The outer wall of the handle 1 is evenly provided with three sets of limiting grooves. The limiting grooves are composed of a vertical pressing section 11 and an arc-shaped rotating section 12. The rotating section 12 is connected to the lower end of the pressing section 11. The outer wall of the handle 1 is also fitted with a pressing component. The pressing component is composed of an annular sleeve 13 fitted on the outer wall of the handle 1, a push rod 14 evenly connected to the lower end of the annular sleeve 13, and an arc-shaped contact plate 15 connected to the lower end of the push rod 14. The annular sleeve 13 is also evenly provided with three sets of screw posts 16 through a threaded connection. The end of the screw post 16 is connected to a ball, and the ball connected to the end of the screw post 16 is located in the limiting groove. The screw posts 16 can restrict the movement of the arc-shaped contact plate 15 along the trajectory of the limiting groove, and the ball improves the smoothness of movement when operating the annular sleeve 13.

[0039] When the probe 3 is inserted into the hole to be tested and cannot move, the annular sleeve 13 is manually slid along the outer wall of the handle 1. Due to the restriction of the limiting groove pressing section 11, the annular sleeve 13 drives the arc-shaped contact plate 15 to move vertically downward through the push rod 14. The arc-shaped contact plate 15 moves downward and cooperates with the inclined surface of the guide wedge block 422. Thus, the locking pin 421 is guided into the lock hole 413 by the inclined surface until the arc-shaped contact plate 15 passes over the plane of the guide wedge block 422 and cooperates. At this time, the annular sleeve 13 is located at the lowest position of the handle 1.

[0040] See Figure 5 The measuring claw assembly 5 includes an inner cylinder 51, which is movably disposed within the probe 3. A telescopic spring is fitted onto the outer wall of the inner cylinder 51. An arc-shaped push block 52 is provided at one end of the inner cylinder 51 facing the axis of the probe 3, and a carbide measuring claw 53 is threadedly connected to the other end of the inner cylinder 51 away from the axis of the probe 3. The displacement sensor is arranged vertically on the outer wall of the carbide measuring claw 53. Figure 5 As shown, in the top view, the lateral length of the arc-shaped contact plate 15 is greater than the distance between the guide wedge block 422 and the adjacent arc-shaped push block 52.

[0041] To ensure the bore diameter is measured after the probe 3 is coaxial with the axis of the hole to be measured, the annular sleeve 13 is manually rotated to move along the rotating section 12 of the limiting groove, thereby indirectly causing the arc-shaped contact plate 15 to rotate at a certain angle. Because the lateral length of the arc-shaped contact plate 15 is greater than the distance between the guide wedge 422 and the adjacent arc-shaped push block 52, the arc-shaped contact plate 15 maintains a planar fit with the guide wedge 422 during rotation, keeping the locking pin 421 inserted into the lock hole 413. During the rotation of the arc-shaped contact plate 15, it cooperates with the arc-shaped push block 52, thereby triggering the hard alloy probe 53 to extend out of the measuring hole. The inside of the head 3 contacts the wall of the hole to be measured. At this time, the displacement sensor on its outer wall undergoes elastic deformation, triggering an electrical signal. The electrical signal is transmitted to the signal processing module, processed by the signal processing module, and output through the display output module. The operator can read the detection value to complete the measurement work by checking whether it is within the error range. It should be noted that two displacement sensors are arranged on the upper and lower outer walls of the carbide measuring claw 53. The two displacement sensors can more accurately measure the specific diameter of the hole to be measured. By taking the average value of the two-point measurement, the influence of local micro-unevenness is effectively suppressed, thereby significantly improving the accuracy and reliability of the single measurement result.

[0042] The carbide measuring claw 53 is triggered laterally along the radial direction of the probe 3 to contact the wall of the hole to be measured. The contact between the carbide measuring claw 53 and the wall of the hole is radial, instantaneous, and under controlled constant force, rather than the axial, full-range, frictional contact of traditional plug gauges. This greatly reduces the wear of the tip of the carbide measuring claw 53, thus ensuring the accuracy of the measurement. At the same time, it avoids the scratches or peeling of the hole wall caused by the original frequent insertion method. Furthermore, during the rotation of the arc-shaped contact plate 15, multiple carbide measuring claws 53 on the periphery of the probe 3 are simultaneously triggered and extended into the probe 3 to contact the wall of the hole to be measured. This keeps the lower end of the probe 3 synchronously aligned with the axis of the hole to be measured. Thus, the multiple carbide measuring claws 53 further complete the secondary radial trigger centering measurement of the lower end of the probe 3. With the simultaneous operation of the primary adaptive floating centering operation and the secondary radial trigger centering measurement, the alignment of the probe 3 with the axis of the hole to be measured is ensured, greatly guaranteeing the measurement accuracy of the hole to be measured.

[0043] When using this measuring structure, its working process can be divided into the following four main stages:

[0044] Phase 1: Preparation and adaptation. Select and install the corresponding probe 3 to the bottom of the handle 1 according to the diameter of the hole to be measured; turn on the power module switch and confirm that the display device 2 is normal and the probe 3 is in the initial state.

[0045] Second stage: Insertion and automatic centering. Hold the handle 1 and insert the probe 3 vertically into the hole to be tested. When the probe 3 contacts the hole opening, the centering contact 411 on it will automatically lock the edge of the hole to be tested. Continue to press down the handle 1. Under the action of the inclined guide rail in the internal space, the probe 3 will automatically and without contact adjust to a position that is completely aligned with the axis of the hole to be tested. During this process, the outer wall of the probe 3 will not rub against the hole wall.

[0046] Third stage: Press down and lock. When the probe 3 can no longer move down (centering is completed), press down on the annular sleeve 13 on the handle 1 until the end. The pressing action drives the locking pin 421 to extend through the internal structure, rigidly locking the centered probe 3 and establishing a stable measurement reference.

[0047] Fourth stage: Rotation measurement and reading. While maintaining the downward pressure, rotate the annular sleeve 13 by one angle. The rotation triggers the internal carbide measuring claw 53 to extend radially synchronously and lightly touch the hole wall for measurement. At the same time, the lower end of the probe 3 is aligned twice. The measurement data is processed and displayed on the LCD screen in real time. The data can be directly read and judged to determine whether it is qualified. After the measurement is completed, rotate the annular sleeve 13 in the opposite direction and lift it up. The carbide measuring claw 53 retracts and the lock is released. The instrument is then taken out vertically.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] 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.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] 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 rapid measurement structure for the inner hole of an automotive die-casting part, characterized in that, include: The handle contains a signal processing module and a power module. The display device is detachably connected to the upper end of the handle, and it contains a display output module. The probe is detachably connected to the lower end of the handle. Its outer circumference is evenly provided with guide grooves extending along its axis, and the guide grooves gradually slope towards the axis of the probe from top to bottom. A centering assembly includes a contact element and a locking element. The contact element includes a right-angled trapezoidal centering contact. A guide post is provided inside the guide groove. The centering contact is movably sleeved on the outer wall of the guide post. A spring is sleeved on the outer wall of the guide post above the centering contact. A stepped groove is provided on the inclined side of the centering contact. The locking element is correspondingly provided inside the probe and located at the upper section of the guide groove. The locking element cooperates with the contact element. When the contact element is located at the uppermost end of the guide groove, the position of the contact element is locked by the locking element. The measuring claw assembly is evenly arranged inside the probe, and the measuring claw assembly is located below the locking member. The measuring claw assembly and the centering assembly inside the probe are arranged alternately. A displacement sensor is provided inside the measuring claw assembly. The displacement sensor, signal processing module, and display output module are all electrically connected to the power supply module. The stepped groove is also slidably provided with a contact block, which is rolled between the contact block and the groove wall. The stepped groove wall is also provided with a guide post, which is movable between the guide post and the contact block. The contact block is located in the middle of the guide post. Springs are sleeved on the outer walls of the guide posts on both sides of the contact block. One end of the spring abuts against the outer wall of the contact block, and the other end abuts against the groove wall. In the process of measuring the inner hole of automotive die-cast parts, the adaptive floating centering and rigid locking of the contact components are first used to establish a reference for the probe to extend into the inner hole for measurement. Then, under the rigid locking state, multiple measuring claw assemblies are driven to extend radially and synchronously from the inside of the probe and contact the hole wall to complete the auxiliary centering and synchronous measurement action of the lower end of the probe.

2. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 1, characterized in that: The stepped groove has a chamfer at the position where it connects to the inclined side, and a locking hole is provided at the end of the centering contact facing the probe axis.

3. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 1, characterized in that: The locking component includes a locking pin, which is movably disposed inside the probe at a position corresponding to the guide groove. A guide wedge is connected to one end of the locking pin near the probe axis. A return spring is sleeved on one end of the locking pin at the connection position with the guide wedge. The upper side of the guide wedge facing the probe axis is an inclined structure that moves from top to bottom toward the probe axis, and the lower side is a vertical planar structure.

4. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 1, characterized in that: The measuring claw assembly includes an inner cylinder column, which is movably disposed inside the probe. A telescopic spring is sleeved on the outer wall of the inner cylinder column. An arc-shaped push block is provided at one end of the inner cylinder column facing the probe axis, and a carbide measuring claw is threadedly connected to the other end of the inner cylinder column away from the probe axis.

5. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 1, characterized in that: The outer wall of the handle is evenly provided with three sets of limiting grooves. The limiting grooves are composed of a vertical pressing section and an arc-shaped rotating section, with the rotating section connected to the lower end of the pressing section.

6. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 5, characterized in that: The outer wall of the handle is fitted with a pressing component, which consists of an annular sleeve fitted on the outer wall of the handle, a push rod evenly connected to the lower end of the annular sleeve, and an arc-shaped contact plate connected to the lower end of the push rod. Three sets of screw posts are evenly threaded through the annular sleeve, and the ends of the screw posts are connected to ball bearings, and the ball bearings connected to the ends of the screw posts are located in the limiting groove.

7. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 2, characterized in that: The wall section of the keyhole is flared.

8. The rapid measurement structure for the inner hole of an automotive die-casting part according to claim 4, characterized in that: The displacement sensor is arranged vertically on the outer wall of the cemented carbide measuring claw.

Images