Roller pass detection device and detection method

Abstract

The invention belongs to the technical field of steel rolling auxiliary equipment, and discloses a roller pass detection device and method.The roller pass detection device comprises a measuring template arranged at the pass position between an upper roller and a lower roller and used for detecting the pass, and a connecting handle is installed on one end face of the measuring template in a clamped mode; through cooperation of the pressure sensor, the conversion structure and the pointer display panel, extrusion of a hole pattern on the rotating rod is converted into horizontal displacement of the movable plate and then is further converted into rotation of the pointer and scale indication of the display panel, meanwhile, the pressure sensor can accurately capture pressure changes and trigger an alarm, and by means of the data-driven detection mode, the detection accuracy is improved. The detection of the hole pattern size is upgraded from fuzzy'hand feeling 'to accurate numerical value and sound-light alarm, the detection precision is remarkably improved, the interference of manual subjective judgment is completely eliminated, and the objectization and digitization of the detection process are realized.

Description

Technical Field

[0001] This invention belongs to the technical field of steel rolling auxiliary equipment, and particularly relates to a roll pass detection device and detection method. Background Technology

[0002] In profile rolling production, the dimensional accuracy of the roll pass directly determines the shape and quality of the final product. During long-term use, the surface of the roll pass will change in size due to wear, thermal fatigue and other reasons. Therefore, it is necessary to inspect and repair the roll pass regularly. Currently, a measurement template-based detection method is commonly used. During detection, the measurement template is inserted into the hole formed by the upper and lower rollers. The motor is started to drive the rollers to rotate at a low speed. The operator manually holds and pushes the measurement template to move it along the hole axis. During this process, the operator subjectively judges whether the hole size meets the preset standard by sensing the different thrust or friction forces acting on the template. The judgment criteria are as follows: if the hole meets the standard, the thrust is moderate; if the hole becomes larger due to wear, the thrust becomes smaller; if the hole becomes smaller due to foreign objects sticking or dents, the thrust increases sharply or even jams the template. Summary of the Invention

[0003] This invention addresses the problem in existing technologies where workers manually hold and push a measuring template along the hole axis. During this process, the operator subjectively judges whether the hole size meets a preset standard by sensing the difference in pushing or frictional force applied to the template. The judgment criteria are: if the hole meets the standard, the pushing force is moderate; if the hole enlarges due to wear, the pushing force decreases; if the hole shrinks due to foreign matter adhesion or indentation, the pushing force increases drastically, even jamming the template. The invention proposes the following technical solution: A roll pass detection device includes a measuring template disposed at the pass between an upper roll and a lower roll for detecting the pass, wherein a connecting handle is snapped onto one end face of the measuring template; The aperture detection assembly includes: a moving plate, a telescopic component, a pressure alarm structure, a conversion structure, a display panel, a pointer, and a rotating rod; The movable plate is horizontally movably connected inside the measuring template. Two telescopic components are fixedly connected between the end face of the movable plate near the connecting handle and the inside of the measuring template. The rotating rod is rotatably connected above the measuring template. The telescopic components provide pre-tightening force to the movable plate and keep the rotating rod in contact with the hole. A pressure alarm structure is installed at the end of the measuring template away from the telescopic components. The pressure alarm structure is connected to the movable plate and is used to detect the pressure on the movable plate. The conversion structure is located inside the measuring template and connected to the movable plate. It is used to convert the horizontal movement of the movable plate into rotational movement. The display panel is connected to the end face of the measuring template near the connecting handle. The pointer is connected to the conversion structure and is used to visually display the displacement of the movable plate.

[0004] As a preferred embodiment of the above technical solution, the measuring template is symmetrically fixed with support blocks on both sides of the top and bottom ends, and the same limiting roller is rotatably connected between two adjacent support blocks.

[0005] As a preferred embodiment of the above technical solution, the pressure alarm structure includes a pressure sensor and an alarm. The movable end of the pressure sensor is fixedly installed on the end face of the moving plate away from the telescopic component, the fixed end of the pressure sensor is fixedly installed inside the measuring template, and the alarm is embedded in the side of the measuring template.

[0006] As a preferred embodiment of the above technical solution, the conversion structure includes an L-shaped sawtooth strip, a positioning gear, a speed-changing gear, a moving rod, a column, and a rotating sleeve; The movable plate is configured as two, and an L-shaped serrated strip is fixedly installed on the opposite surface of the two movable plates. A positioning gear is meshed with the outer side of the L-shaped serrated strip, a speed-changing gear is meshed with the outer side of the positioning gear, and a toothed movable rod is meshed with the outer side of the speed-changing gear. A column is embedded in the movable rod, and a rotating sleeve is sleeved on the outer surface of the column.

[0007] As a preferred embodiment of the above technical solution, T-shaped wheels are welded to the bottom ends of both the positioning gear and the speed-changing gear. The T-shaped wheels are rotatably connected to the inside of the measuring template. A protrusion is welded to the bottom end of the moving rod. A sliding groove is provided on the outer side of the protrusion inside the measuring template. A spiral inclined groove is provided on the outer surface of the rotating sleeve. The column is located inside the spiral inclined groove.

[0008] As a preferred embodiment of the above technical solution, a connecting shaft is snapped into the inside of the rotating sleeve, the connecting shaft is rotatably connected to the inside of the measuring template, and a concave cover is snapped into the outer surface of the connecting shaft.

[0009] As a preferred embodiment of the above technical solution, the display panel is snapped onto the outside of the connecting shaft and located inside the concave cover. The display panel has equidistant scale lines inside and numerical values ​​are located outside the scale lines. The pointer is snapped onto the outside of the connecting shaft via a bearing.

[0010] As a preferred embodiment of the above technical solution, a fixing plate is fixedly installed on the outer surface of the connecting shaft, a damping pad is provided on the end face of the fixing plate near the pointer, and a nut is threadedly connected to the end face of the connecting shaft away from the fixing plate.

[0011] The present invention also provides a detection method using the above-mentioned roll pass detection device, comprising the following steps: S1. Installation and positioning: Hold the measuring template with the connecting handle and place it in the die between the upper and lower rollers, so that the limiting roller contacts the roller surface and the rotating rod contacts the die surface, and maintains the contact state under the pre-tightening force of the telescopic member; S2, Drive Detection: Start the roll motor to drive the upper roll and lower roll to rotate relative to each other at a low speed. Through the friction between the roll and the limiting roll and the rotating rod, the limiting roll and the rotating rod are driven to rotate. S3. Anomaly Detection and Signal Conversion: When the orifice size meets the standard, the moving plate maintains its initial balanced position, the pointer points to zero, and the pressure value monitored by the pressure sensor is within the preset range; When there is a local protrusion in the hole, the local protrusion squeezes the rotating rod, pushing the moving plate to overcome the preload of the telescopic member and move horizontally; the displacement of the moving plate is converted into the rotational motion of the pointer through the conversion structure, thereby displaying the offset scale value on the display panel; at the same time, the displacement of the moving plate causes a change in the pressure on the pressure sensor. When the pressure value detected by the pressure sensor exceeds a preset threshold, the alarm is triggered to issue an alarm. S4. Result Interpretation: By observing the pointer's indication value on the display panel and checking whether the alarm sounds, the staff determines whether the hole size at the current detection position is qualified and records any abnormal locations. S5. Repositioning Inspection: After the inspection dimensions are qualified, the staff holds the measuring template with the connecting handle and moves it to the uninspected position of the hole between the upper and lower rolls for inspection.

[0012] The beneficial effects of this invention are as follows: (1) This invention uses the combination of pressure sensor, conversion structure and pointer display panel to convert the compression of the hole on the rotating rod into the horizontal displacement of the moving plate, and further into the rotation of the pointer and the scale indication of the display panel. At the same time, the pressure sensor can accurately capture pressure changes and trigger an alarm. This "data-driven" detection method upgrades the detection of hole size from vague "feel" to precise numerical value and sound and light alarm, which significantly improves the detection accuracy and completely eliminates the interference of human subjective judgment, realizing the objectification and digitization of the detection process. (2) During the test, the roller rotates at low speed and the device can automatically detect different positions of the hole shape without the need for frequent manual adjustment or repeated sensing. The real-time indication of the pointer on the display panel allows the staff to intuitively see the changes in the hole shape size. The alarm function of the pressure alarm structure can promptly remind when the hole shape is abnormal (pressure exceeds the threshold). The combination of the two makes the test process both efficient (continuous test) and has a good visualization effect. The staff can quickly and clearly grasp the hole shape status and improve the test efficiency. (3) The device can not only perform comprehensive inspection of the entire die pattern, but also inspect the repaired area separately after the wear of the roll is repaired. Simply place the measuring template at the die pattern position formed at the repaired area, and use the detection structure of the device to accurately detect whether the repaired die pattern meets the standard. It does not require the use of other large or complex equipment, and is highly targeted, providing a convenient and effective means for controlling the quality of roll repair. Attached Figure Description

[0013] Figure 1 The diagram shown is a structural schematic of a roll pass detection device and detection method according to Embodiment 1; Figure 2 The image shown is a front view of a roll pass detection device and detection method according to Embodiment 1; Figure 3 The diagram shown is a schematic of the installation structure of the movable plate in Embodiment 1; Figure 4 The diagram shown is a schematic diagram of the installation structure of the telescopic component in Embodiment 1; Figure 5 The diagram shown is a schematic diagram of the conversion structure in Embodiment 1; Figure 6 The diagram shown is a schematic of the installation structure of the connecting shaft in Embodiment 1.

[0014] In the diagram: 1. Measuring template; 2. Connecting handle; 3. Support block; 4. Limiting roller; 51. Pressure sensor; 52. Moving plate; 53. Telescopic component; 54. Conversion structure; 541. L-shaped serrated strip; 542. Positioning gear; 543. Speed-changing gear; 544. Moving rod; 545. Column; 546. Rotating sleeve; 55. Connecting shaft; 56. Concave cover; 57. Display panel; 59. Pointer; 510. Fixing plate; 511. Damping pad; 512. Rotating rod; 513. Alarm. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0016] Example 1 This invention provides a roll pass detection device, such as... Figures 1 to 6 As shown, it includes: a measuring template 1 is set at the hole between the upper and lower rolls for detecting the hole shape; a connecting handle 2 is snapped onto one end face of the measuring template 1; support blocks 3 are symmetrically fixed on both sides of the top and bottom ends of the measuring template 1; the same limiting roller 4 is rotatably connected between two adjacent support blocks 3 through a bushing; the limiting roller 4 is symmetrically arranged on the outside of the upper and lower rolls along the vertical center line of the upper and lower rolls. The aperture detection assembly includes: a movable plate 52, a telescopic component 53, a pressure alarm structure, a conversion structure 54, a display panel 57, a pointer 59, and a rotating rod 512; The movable plate 52 is horizontally movably connected to the inside of the measuring template 1. Two telescopic components 53 (specifically spring telescopic rods) are fixedly connected between the end face of the movable plate 52 near the connecting handle 2 and the inside of the measuring template 1. The rotating rod 512 is rotatably connected above the measuring template 1, located in the direction of roller rotation, and is in contact with the side away from the telescopic components 53. The telescopic components 53 are used to provide pre-tightening force to the movable plate 52 and keep the rotating rod 512 in contact with the die. A pressure alarm structure is installed at the end of the measuring template 1 away from the telescopic components 53. The pressure alarm structure is connected to the movable plate 52 and is used to detect the pressure on the movable plate 52. The conversion structure 54 is located inside the measuring template 1 and is connected to the movable plate 52. It is used to convert the horizontal movement of the movable plate 52 into rotational movement. The display plate 57 is connected to the end face of the measuring template 1 near the connecting handle 2. The pointer 59 is connected to the conversion structure 54 and is used to visually display the displacement of the movable plate 52.

[0017] Workers manually hold and push the measuring template, moving it along the hole axis. During this process, they subjectively judge whether the hole size meets the preset standard by sensing the different pushing or frictional forces acting on the template. The judgment criteria are as follows: if the hole meets the standard, the pushing force is moderate; if the hole becomes larger due to wear, the pushing force becomes smaller; if the hole becomes smaller due to foreign objects sticking or dents, the pushing force increases sharply or even jams the template. In this application, the detection method is upgraded from the traditional and vague "tactile perception" to the modern and precise "data-driven" by using a hole-type detection component. This solves the core pain points of the original method, such as subjectivity, lack of quantification, and poor reliability, and achieves the goal of objectification, digitization, visualization, and efficiency of the detection process.

[0018] In use, the measuring template 1 is held by the connecting handle 2 and placed in the die between the upper and lower rollers, so that the limiting roller 4 contacts the roller surface and the rotating rod 512 contacts the die surface. Under the pre-tightening force of the telescopic member 53, the contact state is maintained. Then, the roller motor is started to drive the upper and lower rollers to rotate at a low speed relative to each other. Through the friction between the rollers, the limiting roller 4 and the rotating rod 512, the two are driven to rotate synchronously with the rollers at a low speed, ensuring the dynamic contact detection between the rotating rod 512 and the die surface. When the upper and lower rollers rotate and there is no wear on the die surface (when the die size meets the standard), the moving plate 52 maintains the initial balance position, the pointer 59 points to zero, and the pressure value monitored by the pressure alarm structure is within the preset range. When there is a local protrusion in the hole, the local protrusion squeezes the rotating rod 512, pushing the moving plate 52 to overcome the pre-tightening force of the telescopic member 53 and move horizontally. The displacement of the moving plate 52 is converted into the rotational motion of the pointer 59 through the conversion structure 54, thereby displaying the offset scale value on the display panel 57. At the same time, the displacement of the moving plate 52 causes the pressure on the pressure alarm structure to change. When the pressure value detected by the pressure alarm structure exceeds the preset threshold, an alarm is issued. At the same time, the staff can determine whether the hole size at the current detection position is qualified by observing the indication value of the pointer 59 on the display panel 57 and whether the alarm 513 is triggered, and record the abnormal position.

[0019] To achieve the effect described above, where the pressure alarm structure triggers an alarm when the pressure exceeds a predetermined range, the following solution is proposed: Figures 2 to 3 As shown, the pressure alarm structure includes a pressure sensor 51 and an alarm 513. The movable end of the pressure sensor 51 (specifically a tension / compression sensor) is fixedly installed on the end face of the movable plate 52 away from the telescopic member 53. The fixed end of the pressure sensor 51 is fixedly installed inside the measuring template 1. The alarm 513 is embedded in the side of the measuring template 1. The pressure sensor 51 and the alarm 513 are electrically connected.

[0020] When in use, the movement of the moving plate 52 causes the pressure sensor 51 to be compressed or stretched, which causes the pressure sensor 51 to operate. When the pressure sensor 51 exceeds the preset range, the alarm 513 is connected to the power and generates an alarm.

[0021] To achieve the conversion of the linear movement of the moving plate 52 into the rotation of the pointer 59 in the above example, the following solution is proposed: Figures 4 to 5 As shown, the conversion structure 54 includes an L-shaped serrated bar 541, a positioning gear 542, a speed-changing gear 543, a moving rod 544, a column 545, and a rotating sleeve 546. L-shaped serrated strips 541 are fixedly installed at the bottom of each movable plate 52 (two L-shaped serrated strips 541 are set for each movable plate 52, and the two L-shaped serrated strips 541 are installed on the opposite surfaces of the two movable plates 52). A positioning gear 542 is meshed with the outer side of the L-shaped serrated strips 541. A speed-changing gear 543 is meshed with the outer side of the positioning gear 542. A toothed moving rod 544 is meshed with the outer side of the speed-changing gear 543. A column 545 is embedded inside the moving rod 544. A rotating sleeve 546 is sleeved on the outer surface of the column 545. A connecting shaft 55 is snapped into the rotating sleeve 546. The connecting shaft 55 is rotatably connected to the inside of the measuring template 1. The pointer 59 is snapped into the outside of the connecting shaft 55 through a bearing.

[0022] In use, the movement of the moving plate 52 causes the L-shaped sawtooth 541 to move. When the L-shaped sawtooth 541 moves, it drives the positioning gear 542 to rotate. When the positioning gear 542 rotates, it drives the speed-changing gear 543 to rotate. When the speed-changing gear 543 rotates, it drives the moving rod 544 to move. When the moving rod 544 moves, it drives the column 545 to move. When the column 545 moves, it drives the rotating sleeve 546 to rotate. At this time, the rotating sleeve 546 drives the pointer 59 to rotate through the connecting shaft 55. The bearing allows the pointer 59 to swing along the outside of the connecting shaft 55. Furthermore, in order to enable the rotating sleeve 546 to rotate when the column 545 moves, the following solution is provided: T-shaped wheels are welded to the bottom ends of the positioning gear 542 and the speed-changing gear 543. The T-shaped wheels are rotatably connected to the inside of the measuring template 1. A protrusion is welded to the bottom end of the moving rod 544. A sliding groove is opened on the outer side of the corresponding protrusion inside the measuring template 1. A spiral inclined groove is opened on the outer surface of the rotating sleeve 546. The column 545 is located inside the spiral inclined groove. The T-shaped wheel enables the positioning gear 542 and the speed-changing gear 543 to rotate but not to move. Meanwhile, the cooperation of the protrusion and the slide groove enables the moving rod 544 to move but not to deviate. Furthermore, the spiral inclined groove converts the linear movement of the column 545 into rotational force. Furthermore, regarding how to keep the position of pointer 59 fixed and perpendicular to the ground, the following solutions are proposed: Figures 4 to 6 As shown, a concave cover 56 is snapped onto the outer surface of the connecting shaft 55, and a display panel 57 is snapped onto the outside of the connecting shaft 55 and located inside the concave cover 56. The display panel 57 has equidistant scale lines inside and numerical values ​​outside the scale lines. A fixing plate 510 is fixedly installed on the outer surface of the connecting shaft 55. A damping pad 511 is provided on the end face of the fixing plate 510 near the pointer 59. A nut is threaded onto the end face of the connecting shaft 55 away from the fixing plate 510. The pointer 59 can swing freely under the action of the bearing. At this time, the operator squeezes the fixing plate 510 with the nut, so that the damping pad 511 of the fixing plate 510 enters the outside of the pointer 59, thereby providing damping force to the pointer 59 so that it can indicate stably when there is no external force intervention.

[0023] The present invention also provides a detection method using the above-mentioned roll pass detection device, comprising the following steps: S1. Installation and positioning: Hold the measuring template 1 by connecting handle 2 and place it in the hole between the upper and lower rollers, so that the limiting roller 4 contacts the roller surface, the rotating rod 512 contacts the hole surface, and the contact state is maintained under the pre-tightening force of the telescopic member 53. S2, Drive detection: Start the roll motor to drive the upper roll and the lower roll to rotate at low speed relative to each other. Through the friction between the roll and the limit roll 4 and the rotating rod 512, the limit roll 4 and the rotating rod 512 are driven to rotate. S3. Anomaly Detection and Signal Conversion: When the orifice size meets the standard, the moving plate 52 maintains the initial balanced position, the pointer 59 points to zero, and the pressure value monitored by the pressure sensor 51 is within the preset range. When there is a local protrusion in the hole, the local protrusion squeezes the rotating rod 512, pushing the moving plate 52 to overcome the pre-tightening force of the telescopic member 53 and move horizontally; the displacement of the moving plate 52 is converted into the rotational motion of the pointer 59 through the conversion structure 54, thereby displaying the offset scale value on the display plate 57; at the same time, the displacement of the moving plate 52 causes its pressure on the pressure sensor 51 to change. When the pressure value detected by the pressure sensor 51 exceeds the preset threshold, the alarm 513 is triggered to issue an alarm. S4. Result Interpretation: By observing the value indicated by pointer 59 on display panel 57 and checking whether alarm 513 sounds, staff determine whether the hole size at the current detection position is qualified and record any abnormal positions. S5. Repositioning Inspection: After the inspection dimensions are qualified, the staff holds the measuring template 1 through the connecting handle 2 and moves it to the uninspected position of the hole between the upper and lower rolls for inspection.

[0024] Working principle: The operator holds the measuring template 1 through the connecting handle 2 and accurately places it in the hole between the upper and lower rolls. At this time, the limiting roller 4 contacts the outer surface of the roll (the limiting roller 4 is symmetrically arranged on the outside of the upper and lower rolls along the vertical center line of the upper and lower rolls), and plays a rolling support and guiding role. At this time, the center line of the measuring template 1 is on the vertical line of the upper and lower rolls. Then, under the pre-tightening force of the telescopic member 53, the rotating rod 512 maintains contact with the inner surface of the die (the contraction of the telescopic member 53 drives the moving plate 52 to move, and when the moving plate 52 moves, it drives the rotating rod 512 to move and then it comes into contact with the outer side of the upper and lower rollers). As the moving plate 52 moves, it drives the L-shaped serrated strip 541 to move, which in turn drives the positioning gear 542 to rotate. The rotation of the positioning gear 542 drives the speed-changing gear 543 to rotate, which in turn drives the moving rod 544 to move, and the movement of the moving rod 544 drives the column 545 to move. When the column 545 moves, it drives the rotating sleeve 546 to rotate. At this time, the rotating sleeve 546 drives the pointer 59 to rotate through the connecting shaft 55 (by pressing the fixing plate 510 with the nut, the damping pad 511 of the fixing plate 510 enters the outside of the pointer 59, thereby providing damping force to the pointer 59 so that it can indicate stably when there is no external force intervention). Before the test, the pointer 59 is adjusted to the zero position perpendicular to the ground by the bearing, and then the fixing plate 510 is pressed by the nut so that the damping pad 511 is in close contact with the pointer 59 to provide damping force and ensure stable indication when there is no external force intervention. Then, the roll motor is started, driving the upper roll and the lower roll to rotate relative to each other at a low speed. Through the friction between the roll and the limit roll 4 and the rotating rod 512, the limit roll 4 and the rotating rod 512 are driven to rotate. When the upper roll and the lower roll rotate and there is no wear on the die surface (when the die size meets the standard), the moving plate 52 maintains the initial balance position, the pointer 59 points to zero, and the pressure value monitored by the pressure sensor 51 is within the preset range. When there is a local protrusion in the die, the local protrusion presses against the rotating rod 512, pushing the moving plate 52 to overcome the preload of the telescopic member 53 and undergo horizontal displacement. The moving plate 52 moves, causing the rotating rod 512 to come into contact with the outer side of the upper and lower rollers and maintain contact with the inner surface of the die. As the moving plate 52 moves, it drives the L-shaped serrated strip 541 to move, which in turn drives the positioning gear 542 to rotate. The rotation of the positioning gear 542 drives the speed-changing gear 543 to rotate, which in turn drives the moving rod 54... 4. When the moving rod 544 moves, it drives the column 545 to move. When the column 545 moves, it drives the rotating sleeve 546 to rotate. At this time, the rotating sleeve 546 drives the pointer 59 to rotate through the connecting shaft 55 (by pressing the fixed plate 510 with the nut, the damping pad 511 of the fixed plate 510 enters the outside of the pointer 59, thereby providing damping force to the pointer 59 so that it can indicate stably when there is no external force intervention), thereby displaying the offset scale value on the display panel 57. At the same time, the displacement of the moving plate 52 causes the pressure on the pressure sensor 51 to change. When the pressure value detected by the pressure sensor 51 exceeds the preset threshold, the alarm 513 will sound an alarm. At the same time, the staff will determine whether the hole size at the current detection position is qualified by observing the indication value of the pointer 59 on the display panel 57 and whether the alarm 513 sounds, and record the abnormal position. After completing one test, the operator can gently push the measuring template 1 through the connecting handle 2 to move it to the next untested section.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A roll pass detection device, characterized in that, include: A measuring template (1) is set at the hole between the upper and lower rollers for detecting the hole shape. A connecting handle (2) is snapped onto one end face of the measuring template (1). The hole shape detection assembly includes: a moving plate (52), a telescopic component (53), a pressure alarm structure, a conversion structure (54), a display panel (57), a pointer (59), and a rotating rod (512). The moving plate (52) is horizontally movably connected to the inside of the measuring template (1). Two telescopic components (53) are fixedly connected between the end face of the moving plate (52) near the connecting handle (2) and the inside of the measuring template (1). The rotating rod (512) is rotatably connected above the measuring template (1). The telescopic components (53) are used to provide a connection for the moving plate. The plate (52) provides preload and keeps the rotating rod (512) in contact with the hole. A pressure alarm structure is installed at the end of the measuring template (1) away from the telescopic member (53). The pressure alarm structure is connected to the moving plate (52) and is used to detect the pressure on the moving plate (52). The conversion structure (54) is located inside the measuring template (1) and is connected to the moving plate (52) to convert the horizontal movement of the moving plate (52) into rotational movement. The display plate (57) is connected to the end face of the measuring template (1) near the connecting handle (2). The pointer (59) is connected to the conversion structure (54) and is used to visually display the displacement of the moving plate (52).

2. The roll pass detection device according to claim 1, characterized in that, The measuring template (1) has symmetrical support blocks (3) fixed on both sides of the top and bottom ends, and the same limiting roller (4) is rotatably connected between two adjacent support blocks (3).

3. The roll pass detection device according to claim 2, characterized in that, The pressure alarm structure includes a pressure sensor (51) and an alarm (513). The movable end of the pressure sensor (51) is fixedly installed on the end face of the movable plate (52) away from the telescopic member (53). The fixed end of the pressure sensor (51) is fixedly installed inside the measuring template (1). The alarm (513) is embedded in the side of the measuring template (1).

4. The roll pass detection device according to claim 3, characterized in that, The conversion structure (54) includes an L-shaped serrated bar (541), a positioning gear (542), a speed-changing gear (543), a moving rod (544), a column (545), and a rotating sleeve (546). The moving plate (52) is configured as two, and an L-shaped serrated bar (541) is fixedly installed on the opposite surface of the two moving plates (52). The positioning gear (542) is meshed with the outer side of the L-shaped serrated bar (541), and the speed-changing gear (543) is meshed with the outer side of the positioning gear (542). The moving rod (544) is meshed with the outer side of the speed-changing gear (543), and the toothed moving rod (544) is meshed with the outer side of the speed-changing gear (543). The column (545) is embedded in the moving rod (544), and the rotating sleeve (546) is sleeved on the outer surface of the column (545).

5. The roll pass detection device according to claim 4, characterized in that, The bottom ends of the positioning gear (542) and the speed-changing gear (543) are both welded with T-shaped wheels. The T-shaped wheels are rotatably connected to the inside of the measuring template (1). The bottom end of the moving rod (544) is welded with a protrusion. The measuring template (1) has a sliding groove on the outside of the corresponding protrusion. The outer surface of the rotating sleeve (546) has a spiral inclined groove. The column (545) is located inside the spiral inclined groove.

6. The roll pass detection device according to claim 5, characterized in that, The rotating sleeve (546) is fitted with a connecting shaft (55), which is rotatably connected to the inside of the measuring template (1). A concave cover (56) is fitted with the outer surface of the connecting shaft (55).

7. The roll pass detection device according to claim 6, characterized in that, The display panel (57) is snapped onto the outside of the connecting shaft (55) and located inside the concave cover (56). The display panel (57) has equidistant scale lines inside and numerical values ​​outside the scale lines. The pointer (59) is snapped onto the outside of the connecting shaft (55) via a bearing.

8. The roll pass detection device according to claim 7, characterized in that, The outer surface of the connecting shaft (55) is fixedly mounted with a fixing plate (510). The end face of the fixing plate (510) near the pointer (59) is provided with a damping pad (511). The end face of the connecting shaft (55) away from the fixing plate (510) is connected with a nut by a thread.

9. A detection method using the roll pass detection device of claim 8, characterized in that, Includes the following steps: S1. Installation and positioning: Hold the measuring template (1) with the connecting handle (2) and place it in the hole between the upper and lower rollers, so that the limiting roller (4) contacts the roller surface, the rotating rod (512) contacts the hole surface, and the contact state is maintained under the pre-tightening force of the telescopic member (53); S2, Drive detection: Start the roll motor to drive the upper roll and the lower roll to rotate at a low speed relative to each other. Through the friction between the roll and the limiting roll (4) and the rotating rod (512), the limiting roll (4) and the rotating rod (512) are driven to rotate. S3. Anomaly Detection and Signal Conversion: When the orifice size meets the standard, the moving plate (52) maintains the initial equilibrium position, the pointer (59) points to zero, and the pressure value monitored by the pressure sensor (51) is within the preset range; When there is a local protrusion in the hole, the local protrusion squeezes the rotating rod (512), pushing the moving plate (52) to overcome the preload of the telescopic member (53) and move horizontally; the displacement of the moving plate (52) is converted into the rotational motion of the pointer (59) through the conversion structure (54), thereby displaying the offset scale value on the display panel (57); at the same time, the displacement of the moving plate (52) causes its pressure on the pressure sensor (51) to change; When the pressure value detected by the pressure sensor (51) exceeds the preset threshold, the alarm (513) is triggered to issue an alarm. S4. Result Interpretation: The staff observes the indication value of the pointer (59) on the display panel (57) and determines whether the hole size at the current detection position is qualified based on whether the alarm (513) is triggered, and records the abnormal position. S5. Repositioning Inspection: After the inspection dimensions are qualified, the staff holds the measuring template (1) through the connecting handle (2) and moves it so that the measuring template (1) enters the uninspected hole position between the upper and lower rolls for inspection.

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