Detection device for workpiece opening

Abstract

The invention relates to the technical field of workpiece size detection, and provides a workpiece opening detection device, which comprises an operation table, a detection unit, a detection unit and a control unit, and is characterized in that the operation table is provided with a fixing unit and a detection unit; the fixing unit is used for supporting and fixing a workpiece; the detection unit is provided with a detection piece, a first moving block and a second moving block, the first moving block and the second moving block are oppositely arranged in the horizontal direction, one end of the first moving block and one end of the second moving block are inserted into the opening, and the detection piece is arranged on the first moving block and used for detecting the distance between the first moving block and the second moving block in the horizontal direction; the first moving block and the second moving block have a feeding state of being close to each other and a detection state of being far away from each other; in the feeding state, the mounting of workpieces is avoided; in the detection state, the first moving block and the second moving block abut against the two side walls of the opening respectively and are used for detecting the size of the opening. By means of the design, full-automatic operation of the detection process is achieved, and manual intervention is not needed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of workpiece size detection, and particularly relates to a detection device for a workpiece opening. BACKGROUND

[0002] In the mechanical manufacturing, automobile parts, precision instruments and other industries, the workpiece often has an opening structure for assembly, positioning or function realization. In order to ensure the subsequent assembly precision and product performance, the size of such opening needs to be strictly controlled within the design tolerance range. At present, the detection of the size of the workpiece opening mostly relies on manual operation, and the traditional measuring tools such as vernier caliper, plug gauge or micrometer are usually used to manually measure the distance between the two side walls of the opening by the operator.

[0003] However, the above-mentioned manual measurement method has many disadvantages: first, the measurement result is easily affected by the operator's experience, method and visual error, and the repeatability and consistency are poor; second, in the mass production scene, manual measurement is low in efficiency and difficult to meet the rhythm requirements of the automatic production line; in addition, frequent manual intervention also increases the labor intensity and labor cost. SUMMARY

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present application is to provide a detection device for a workpiece opening, which realizes full-automatic operation of the detection process without manual intervention. Not only the detection efficiency is significantly improved, but also the high repeatability and consistency of the measurement result are ensured. It is especially suitable for mass production and high rhythm production scenes.

[0005] The technical solution adopted by the present application to solve the technical problem is to provide a detection device for a workpiece opening, comprising:

[0006] an operation table;

[0007] a fixing unit arranged on the operation table and used for providing support and fixation for the workpiece;

[0008] a detection unit arranged on the operation table and having a detection piece, a first moving block and a second moving block, the first moving block and the second moving block are arranged opposite to each other in the horizontal direction, and one end of each of the first moving block and the second moving block is inserted into the opening, the detection piece is arranged on the first moving block and used for detecting the distance between the first moving block and the second moving block in the horizontal direction;

[0009] the first moving block and the second moving block have a feeding state and a detection state;

[0010] when in the feeding state, the first moving block and the second moving block are close to each other to avoid the installation of the workpiece;

[0011] When in the detection state, the first moving block and the second moving block move away from each other in the horizontal direction and abut against the two side walls of the opening, respectively, for detecting the size of the opening.

[0012] In the above-mentioned opening detection device for a workpiece, the opening is a long strip structure, and the operating table is provided with several sets of detection units. Each set of detection units includes the detection element, the first moving block and the second moving block, for simultaneously detecting the size of the opening at multiple positions.

[0013] In the above-mentioned opening detection device for a workpiece, the first moving block and the second moving block are respectively provided with a first contact portion and a second contact portion extending in a vertical direction, and the first contact portion and the second contact portion respectively contact the inner walls on both sides of the opening.

[0014] In the above-mentioned opening detection device for a workpiece, a first slide rail is provided on the operating table, and a first slider and a second slider are slidably disposed on the first slide rail. The first moving block and the second moving block are respectively connected to the first slider and the second slider.

[0015] In the above-described opening detection device for a workpiece, each group of detection units further includes:

[0016] The first driving component has its body fixed to the first moving block and its output end connected to the second moving block, and is used to make the first moving block and the second moving block move closer or further apart on the first slide rail.

[0017] The first limiting block and the second limiting block are respectively provided on the sidewalls of the first moving block and the second moving block. The first limiting block and the second limiting block are respectively located on the moving paths of the first moving block and the second moving block, and respectively move against the corresponding first protrusion and the second protrusion to provide limiting for the first moving block and the second moving block.

[0018] In the above-described opening detection device for a workpiece, the fixing unit includes:

[0019] A first support base is provided on the operating table, and the first movable block and the second movable block are located to the side of the first support base;

[0020] A support block is disposed at the top of the first support base, and the workpiece is placed on the support block to support the workpiece;

[0021] A positioning element is disposed at the top of the first support base and located on the side of the support block. The positioning element abuts against the outer side wall of the workpiece and is used to provide positioning for the workpiece.

[0022] In the above-described opening detection device for a workpiece, the fixing unit further includes:

[0023] A second support base is provided on the operating table;

[0024] A clamping element is movably disposed above the support block and abuts against the workpiece to fix the workpiece.

[0025] A drive rod is hinged to the second support base, and the abutment is connected to one end of the drive rod for driving the abutment to press against or move away from the workpiece;

[0026] The second driving component is mounted on the second support base, and the other end of the driving rod is connected to the output end of the second driving component to drive the driving rod to rotate.

[0027] In the above-mentioned opening detection device for a workpiece, a limiting component is also provided on the operating table. The limiting component abuts against the end of the workpiece to provide a limit for the workpiece.

[0028] In the above-described opening detection device for a workpiece, the limiting component includes:

[0029] The third limiting block is fixed on the operating table and abuts against one end of the workpiece in the length direction.

[0030] The fourth limiting block is movably disposed on the operating table and abuts against the end of the workpiece away from the third limiting block.

[0031] A movable seat is movably mounted on the operating table, and the fourth limiting block is connected to the movable seat to drive the fourth limiting block closer to or further away from the workpiece;

[0032] A third driving component is disposed on the operating table, and the output end of the third driving component is connected to the movable seat for driving the movable seat to move.

[0033] In the above-mentioned opening detection device for a workpiece, a second slide rail is provided on the operating table, a third slider is slidably disposed on the second slide rail, and the movable seat is connected to the third slider.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) By setting up fixed units and detection units on the operating table, the detection process can be fully automated without manual intervention. This not only significantly improves detection efficiency but also ensures high repeatability and consistency of measurement results. It is especially suitable for high-volume, high-rate-of-production scenarios, and can quickly and stably complete the online detection of key dimensions of workpiece openings, effectively replacing traditional manual measurement methods, greatly reducing the labor intensity of operators, reducing human error, and saving labor costs.

[0036] (2) The detection unit employs a first moving block and a second moving block arranged horizontally opposite each other. In the "feeding state," the two blocks are installed close to each other to avoid the workpiece, while in the "detection state," they move away from each other and abut against the inner walls on both sides of the opening. The detection piece is placed on the first moving block, and the actual width of the opening can be accurately obtained by calculating twice the displacement on one side. This design integrates automatic centering, interference-free feeding, and highly repeatable contact measurement, effectively avoiding eccentric errors introduced by workpiece offset or manual measurement, and significantly improving measurement accuracy and reliability.

[0037] (3) Multiple detection units are integrated on the operating table and distributed along the length of the workpiece opening. After the workpiece is clamped once, the detection units can be synchronized through unified control to acquire the width data of multiple key sections at once. This multi-point synchronous detection method effectively overcomes the problem of single-point measurement distortion caused by deformation such as taper, bending, local necking or flaring of long openings. It can comprehensively evaluate the geometric characteristics of the opening in terms of dimensional consistency, straightness and symmetry in the length direction, significantly improve the integrity of the detection, and meet the efficiency requirements of high-cycle automated production lines. Attached Figure Description

[0038] Figure 1 This is a 3D view of the workpiece in this design.

[0039] Figure 2 This is a 3D view of the proposed solution.

[0040] Figure 3 yes Figure 2 A 3D view of the hidden part of the structure.

[0041] Figure 4 This is the book Figure 3 A 3D view of the hidden part of the structure.

[0042] Figure 5 This is a 3D view of the detection unit in this scheme.

[0043] Figure 6 This is a three-dimensional view of the fixed unit in this scheme.

[0044] In the diagram, 100 is the workpiece; 110 is the opening; 200 is the operating table; 210 is the first slide rail; 211 is the first slider; 212 is the second slider; 220 is the second slide rail; 221 is the third slider; 300 is the fixing unit; 310 is the first support base; 320 is the support block; 330 is the positioning component; 340 is the second support base; 350 is the clamping component; 360 is the drive rod; 370 is the second drive component; and 400 is the inspection component. Measurement unit; 410, detection element; 420, first moving block; 421, first contact part; 422, first protrusion; 430, second moving block; 431, second contact part; 432, second protrusion; 440, first driving element; 450, first limiting block; 460, second limiting block; 500, limiting assembly; 510, third limiting block; 520, fourth limiting block; 530, moving seat; 540, third driving element. Detailed Implementation

[0045] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] like Figures 1 to 6 As shown, this solution provides a detection device for workpiece openings, comprising: an operating table 200; a fixing unit 300, which is disposed on the operating table 200 for providing support and fixing for the workpiece; and a detection unit 400, which is disposed on the operating table 200 and has a detection element 410, a first moving block 420 and a second moving block 430, the first moving block 420 and the second moving block 430 being arranged opposite each other in the horizontal direction, and one end of each of the first moving block 420 and the second moving block 430 being inserted into the opening; the detection element 410 being disposed on the first moving block 420 for detecting the distance between the first moving block 420 and the second moving block 430 in the horizontal direction.

[0048] The first moving block 420 and the second moving block 430 have a feeding state and a detection state. When in the feeding state, the first moving block 420 and the second moving block 430 move closer to each other to avoid the installation of the workpiece. When in the detection state, the first moving block 420 and the second moving block 430 move further apart from each other in the horizontal direction and abut against the two side walls of the opening respectively to detect the opening size.

[0049] During operation, the first moving block 420 and the second moving block 430 are in their initial positions, in a "loading state" close to each other. In this state, the horizontal distance between the ends of the first moving block 420 and the second moving block 430 is set to be less than the width of the opening of the workpiece to be measured, and is precisely aligned with the expected opening projection area below the workpiece mounting position. This design ensures that the first moving block 420 and the second moving block 430 do not interfere with the downward path of the workpiece during placement, while providing a reference positioning for subsequent automatic alignment and measurement.

[0050] The operator or automated feeding mechanism places the workpiece to be tested smoothly on the fixed unit 300. Since the first moving block 420 and the second moving block 430 remain closed in the feeding state and their end heights are slightly lower than or flush with the bottom surface of the workpiece but not in contact with it, the opening of the workpiece can be smoothly "fitted" onto the outside of the ends of the first moving block 420 and the second moving block 430. That is, the opening covers the end areas of the first moving block 420 and the second moving block 430 from above. However, at this time, there is no physical contact between the workpiece and the first moving block 420 and the second moving block 430, and no force is generated, thereby avoiding positioning deviation or workpiece jamming caused by pre-contact.

[0051] Subsequently, the fixing unit 300 fixes the workpiece to ensure its stable position and prevent displacement or vibration during subsequent inspection. Once the workpiece is accurately positioned and reliably clamped, the inspection unit 400 begins operation.

[0052] At this time, the first moving block 420 and the second moving block 430 move away from each other in a horizontal direction simultaneously. The ends of the first moving block 420 and the second moving block 430 continue to expand outward inside the opening until they rigidly abut against the inner walls on both sides of the opening. This abutting process ensures contact consistency under measurement conditions and effectively eliminates gap errors.

[0053] Meanwhile, the detection element 410, mounted on the first moving block 420, continuously collects the horizontal displacement of the first moving block 420 from its initial loading position to its final contact position. Since the first moving block 420 and the second moving block 430 move in opposite directions at the same speed and with the same stroke, the system can accurately obtain the actual width of the opening by calculating twice the displacement on one side, based on the principle of symmetry. The detection element 410 can be a displacement sensor, a linear encoder, or a wire encoder.

[0054] The entire inspection process is automatically controlled by the program, requiring no manual intervention. This not only significantly improves inspection efficiency but also ensures a high degree of repeatability and consistency in measurement results. Especially in high-volume, high-paced production scenarios, the inspection device in this solution can quickly and stably complete online inspection of key dimensions of workpieces, effectively replacing traditional manual caliper or plug gauge inspection methods. This greatly reduces the labor intensity of operators, minimizes human error, and saves labor costs.

[0055] The workpiece has a long, narrow opening, which is prone to deformation defects such as taper, bending, localized necking, or flaring during processing. Dimensional measurements at a single location are insufficient to fully reflect its overall quality. Therefore, several sets of detection units 400 are installed on the operating table 200. Each detection unit 400 includes a detection element 410, a first moving block 420, and a second moving block 430, enabling simultaneous acquisition of dimensional data at multiple key cross-sections along the length of the opening during a single workpiece clamping and detection operation.

[0056] This multi-point synchronous detection structure not only significantly improves detection efficiency and avoids the time-consuming process of repeated positioning or segmented movement, greatly shortening the single-piece detection cycle, but is also particularly suitable for high-cycle automated production lines and large-volume rapid quality inspection scenarios. More importantly, by simultaneously collecting the width information of multiple cross-sections, it can effectively identify the dimensional consistency, straightness, and symmetry deviation of the opening in the length direction, and comprehensively evaluate its geometric morphology quality.

[0057] More preferably, the ends of the first moving block 420 and the second moving block 430 are respectively provided with a first contact portion 421 and a second contact portion 431 extending in the vertical direction. In the detection state, the first contact portion 421 and the second contact portion 431 respectively contact the inner walls on both sides of the opening.

[0058] To achieve smooth movement of the first moving block 420 and the second moving block 430 on the operating table 200, a first slide rail 210 is provided on the operating table 200. A first slider 211 and a second slider 212 are slidably arranged on the first slide rail 210. The first moving block 420 and the second moving block 430 are respectively connected to the first slider 211 and the second slider 212.

[0059] During operation, the first moving block 420 and the second moving block 430 move synchronously towards or away from each other along the first slide rail 210 via their respective first sliders 211 and second sliders 212, thereby switching between the feeding state and the detection state. The cooperation between the first slide rail 210 and the first sliders 211 and second sliders 212 effectively constrains the horizontal degrees of freedom of the first moving block 420 and the second moving block 430, preventing them from swaying, warping, or jamming during movement, thus improving measurement repeatability and dimensional accuracy.

[0060] Furthermore, each detection unit 400 also includes: a first driving member 440, whose body is fixed on the first moving block 420 and whose output end is connected to the second moving block 430, used to make the first moving block 420 and the second moving block 430 move closer or further apart along the first slide rail 210 during the extension and retraction process; a first limiting block 450 and a second limiting block 460, respectively located on the moving paths of the first moving block 420 and the second moving block 430, with a first protrusion 422 and a second protrusion 432 respectively provided on the side walls of the first moving block 420 and the second moving block 430, the first limiting block 450 abutting against the first protrusion 422 and the second limiting block 460 abutting against the second protrusion 432 at the extreme positions to limit the stroke of the first moving block 420 and the second moving block 430.

[0061] During operation, after the workpiece is clamped by the fixing unit 300, the first driving member 440 is activated. When the output end of the first driving member 440 extends, it pushes the second moving block 430 to move away from the first moving block 420 along the first slide rail 210 via the second slider 212; simultaneously, the first moving block 420 moves in the opposite direction along the first slide rail 210 via the first slider 211, thereby moving the first moving block 420 and the second moving block 430 away from each other. When the first contact part 421 and the second contact part 431 respectively abut against the inner walls on both sides of the workpiece opening, the opening size is detected. When the output end of the first driving member 440 retracts, it pulls the second moving block 430 to move closer to the first moving block 420, and the first moving block 420 moves synchronously closer to the first moving block 420 until it returns to the loading state, facilitating workpiece loading and unloading. Preferably, the first driving member 440 is a cylinder.

[0062] The first limiting block 450 and the second limiting block 460 serve as safety limiting mechanisms, with their limiting positions set slightly larger than the maximum permissible size of the workpiece opening. Under normal operating conditions, the first moving block 420 and the second moving block 430 stop moving after contacting the sidewall of the opening. If the air pressure rises abnormally, for example, due to excessively high pressure settings during debugging, or due to aging of the air supply valve causing uncontrolled output force, the first limiting block 450 and the second limiting block 460 can prevent the first moving block 420 and the second moving block 430 from moving further apart, thereby avoiding excessive contact force that could damage the workpiece.

[0063] Further, the fixing unit 300 includes: a first support base 310, which is disposed on the operating table 200, and a first moving block 420 and a second moving block 430 are located on the side of the first support base 310; a support block 320, which is disposed at the top of the first support base 310, and the workpiece is placed on the support block 320 for supporting the workpiece; and a positioning member 330, which is disposed at the top of the first support base 310 and located on the side of the support block 320, and the positioning member 330 abuts against the outer side wall of the workpiece for positioning the workpiece.

[0064] Furthermore, the fixing unit 300 also includes: a second support base 340, which is disposed on the operating table 200; a clamping member 350, which is movably disposed above the support block 320 and abuts against the workpiece for fixing the workpiece; a drive rod 360, which is hinged to the second support base 340, and the clamping member 350 is connected to one end of the drive rod 360 for driving the clamping member 350 to press against or move away from the workpiece; and a second drive member 370, which is disposed on the second support base 340, and the other end of the drive rod 360 is connected to the output end of the second drive member 370 for driving the drive rod 360 to rotate.

[0065] During operation, the workpiece is placed on the first support base 310 manually or by an automated device. At this time, the support block 320 is located below the workpiece and provides support, while the positioning element 330 abuts against the outer wall of the workpiece, providing a horizontal positioning reference. After the workpiece is in place, the second drive element 370 is activated, driving the second drive rod 360 to rotate around its hinge point, which in turn moves the clamping element 350 downwards, making it tightly abut against the upper surface of the workpiece. Thus, the clamping element 350 and the support block 320 clamp the workpiece vertically from both sides, effectively preventing displacement or vibration during the inspection process and ensuring measurement accuracy. The second drive element 370 can be a motor, hydraulic cylinder, or pneumatic cylinder.

[0066] The workpiece is supported at the bottom by the support block 320, with the positioning component 330 providing a lateral reference, and the upper clamping component 350 applying a clamping force, forming a triple constraint mechanism of "bottom support, side positioning, and upper clamping". This effectively restricts the workpiece's degree of freedom in the horizontal and vertical directions, significantly improves the clamping repeatability and positioning accuracy, and provides a stable reference for subsequent opening size detection.

[0067] Furthermore, the operating table 200 is also provided with a limiting component 500, which abuts against the end of the workpiece and is used to limit the length of the workpiece.

[0068] More preferably, the limiting component 500 includes: a third limiting block 510, a fourth limiting block 520, a movable seat 530, and a third driving member 540. The third limiting block 510 is fixedly disposed on the operating table 200 and is used to abut against one end of the workpiece; the movable seat 530 is movably disposed on the operating table 200, and the fourth limiting block 520 is mounted on the movable seat 530 and is opposite to the end of the workpiece away from the third limiting block 510; the third driving member 540 is disposed on the operating table 200, and its output end is connected to the movable seat 530, used to drive the movable seat 530 to move the fourth limiting block 520 closer to or away from the workpiece.

[0069] During operation, after the workpiece is placed on the support block 320, one end of it abuts against the fixed third limiting block 510. Subsequently, the third driving component 540 is activated, driving the moving seat 530 to move the fourth limiting block 520 towards the other end of the workpiece until it abuts against the end face of the workpiece. Thus, the third limiting block 510 and the fourth limiting block 520 together provide bidirectional limiting for the workpiece in the length direction, ensuring consistent clamping position each time. The third driving component 540 can be a motor, hydraulic cylinder, or pneumatic cylinder.

[0070] Through the synergistic action of the fixed third limiting block 510 and the adjustable fourth limiting block 520, fluctuations in the length direction caused by manual placement errors or automated feeding deviations are effectively eliminated, ensuring a strict correspondence between the opening detection point and the key feature position of the workpiece. Especially in the multi-position synchronous detection of long strip openings, the positioning accuracy in the length direction of the workpiece directly determines the accuracy of the spatial coordinates of each detection section; this limiting component 500 significantly improves the repeatability and lateral comparability of multi-point measurement data by using a unified clamping datum.

[0071] In addition, the fourth limit block 520 is driven by the third drive component 540, and its position can be automatically adjusted according to the length of different workpieces. Without the need to replace mechanical parts, it can be quickly adapted to various product models simply by switching programs, greatly enhancing the versatility of the equipment and the flexibility of the production line.

[0072] Furthermore, the limiting action can be automatically triggered after the workpiece is placed, and it forms a precise timing linkage with the clamping action of the fixing unit 300 and the extension action of the detection unit 400, thus constructing a complete automated operation cycle of "placement, limiting, clamping, and detection". This not only improves detection efficiency but also enhances the overall integration and reliability of the system.

[0073] In summary, the 500 limiting component not only efficiently solves the problem of precise positioning of workpieces in the length direction, but also significantly improves the automation level, inspection consistency and process adaptability of the whole system, providing solid technical support for achieving high-precision, high-efficiency and flexible industrial quality inspection.

[0074] More preferably, the operating table 200 is provided with a second slide rail 220, and a third slider 221 is slidably disposed on the second slide rail 220. The movable seat 530 is connected to the third slider 221. The movable seat 530 is guided by the second slide rail 220 and the third slider 221, and its movement is smooth and without wobbling. The third driving component 540 provides controllable thrust, which can ensure reliable limit contact and avoid impact damage to the end face of the workpiece, and is especially suitable for precision or easily damaged parts.

[0075] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" 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. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A detection device for workpiece openings, characterized in that, include: Control panel; A fixing unit, which is disposed on the operating table, is used to provide support and fixation for the workpiece; The detection unit is disposed on the operating table and has a detection element, a first moving block and a second moving block. The first moving block and the second moving block are arranged opposite each other in the horizontal direction, and one end of the first moving block and the second moving block is inserted into the opening. The detection element is disposed on the first moving block and is used to detect the distance between the first moving block and the second moving block in the horizontal direction. The first moving block and the second moving block have a feeding state and a detection state; When in the loading state, the first moving block and the second moving block move closer to each other to avoid the installation of the workpiece; When in the detection state, the first moving block and the second moving block move away from each other in the horizontal direction and abut against the two side walls of the opening, respectively, for detecting the size of the opening.

2. The opening detection device for a workpiece as described in claim 1, wherein the opening is elongated, characterized in that, The operating table is provided with several sets of detection units. Each set of detection units includes the detection element, the first moving block and the second moving block, and is used to simultaneously detect the size of the opening at multiple positions.

3. The opening detection device for a workpiece as described in claim 1, characterized in that, The ends of the first moving block and the second moving block are respectively provided with a first contact portion and a second contact portion extending in the vertical direction, and the first contact portion and the second contact portion respectively contact the inner walls on both sides of the opening.

4. The opening detection device for a workpiece as described in claim 1, characterized in that, The operating platform is provided with a first slide rail, on which a first slider and a second slider are slidably disposed. The first moving block and the second moving block are respectively connected to the first slider and the second slider.

5. The opening detection device for a workpiece as described in claim 2, characterized in that, Each group of detection units further includes: The first driving component has its body fixed to the first moving block and its output end connected to the second moving block, and is used to make the first moving block and the second moving block move closer or further apart on the first slide rail. The first limiting block and the second limiting block are respectively provided on the sidewalls of the first moving block and the second moving block. The first limiting block and the second limiting block are respectively located on the moving paths of the first moving block and the second moving block, and respectively move against the corresponding first protrusion and the second protrusion to provide limiting for the first moving block and the second moving block.

6. The opening detection device for a workpiece as described in claim 1, characterized in that, The fixing unit includes: A first support base is provided on the operating table, and the first movable block and the second movable block are located to the side of the first support base; A support block is disposed at the top of the first support base, and the workpiece is placed on the support block to support the workpiece; A positioning element is disposed at the top of the first support base and located on the side of the support block. The positioning element abuts against the outer side wall of the workpiece and is used to provide positioning for the workpiece.

7. The opening detection device for a workpiece as described in claim 6, characterized in that, The fixing unit further includes: A second support base is provided on the operating table; A clamping element is movably disposed above the support block and abuts against the workpiece to fix the workpiece. A drive rod is hinged to the second support base, and the abutment is connected to one end of the drive rod for driving the abutment to press against or move away from the workpiece; The second driving component is mounted on the second support base, and the other end of the driving rod is connected to the output end of the second driving component to drive the driving rod to rotate.

8. The opening detection device for a workpiece as described in claim 1, characterized in that, The operating platform is also provided with a limiting component, which abuts against the end of the workpiece to provide a limit for the workpiece.

9. The opening detection device for a workpiece as described in claim 8, characterized in that, The limiting component includes: The third limiting block is fixed on the operating table and abuts against one end of the workpiece in the length direction. The fourth limiting block is movably disposed on the operating table and abuts against the end of the workpiece away from the third limiting block. A movable seat is movably mounted on the operating table, and the fourth limiting block is connected to the movable seat to drive the fourth limiting block closer to or further away from the workpiece; A third driving component is disposed on the operating table, and the output end of the third driving component is connected to the movable seat for driving the movable seat to move.

10. The opening detection device for a workpiece as described in claim 9, characterized in that, The operating platform is provided with a second slide rail, and a third slider is slidably mounted on the second slide rail. The movable seat is connected to the third slider.

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