A device for measuring the radius of the corner fold of a spun head
By designing a measuring device for the folding radius of a spun head using a flexible metal sheet and a worm gear transmission system, the problem of difficult operation under limited internal space of the head was solved, achieving stable positioning and fine adjustment, and improving the convenience and accuracy of measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN LINMEI HEAD PLATE
- Filing Date
- 2025-09-21
- Publication Date
- 2026-06-30
AI Technical Summary
Existing measuring devices for the corner folding radius of spun heads make it difficult for operators to simultaneously maintain a stable grip on the tool and make precise adjustments when the internal space of the head is limited. This results in unstable positioning or difficulty in adjustment, affecting the continuity of measurement.
A device for measuring the turning angle and folding radius of a spinning end cap, comprising a flexible metal sheet, an adjustment component, a support rod, and a worm gear transmission system, was designed. The worm gear transmission pair enables synchronous extension and retraction of the lead screw, and the combination of a horizontal bubble meter and anti-slip texture design ensures stable positioning and fine adjustment of the device.
It improves ease of operation and measurement accuracy. The design of anti-slip texture and horizontal bubble level ensures stable positioning and fine adjustment of the device in the confined space inside the head, reducing the difficulty of operation and improving measurement efficiency and accuracy.
Smart Images
Figure CN224435374U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of end cap folding radius measurement technology, specifically a device for measuring the folding radius of a spun end cap. Background Technology
[0002] In the field of pressure vessel manufacturing, the radius of the corner flange of a spun head is a crucial parameter affecting structural strength and welding quality, requiring precise measurement during production. Traditional measurement methods often rely on simple, manually operated tools to quickly assess the radius of curvature.
[0003] Existing measuring devices, due to the limited internal space of the end cap, make it difficult for operators to simultaneously maintain a stable grip on the tool and make fine adjustments, which can easily lead to unstable positioning or difficulty in adjustment, affecting the continuity of measurement. Therefore, a measuring device for the corner folding radius of a spun end cap is provided. Utility Model Content
[0004] The purpose of this utility model is to provide a measuring device for the corner folding radius of a spun head, so as to solve the problem that in the above-mentioned existing measuring devices, due to the limited internal space of the head, it is difficult for operators to simultaneously ensure stable tool holding and fine adjustment during operation, which easily leads to unstable positioning or difficulty in adjustment, affecting the continuity of measurement.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for measuring the radius of the folded edge of a spun head, comprising a flexible metal sheet, an adjustment component fixedly disposed on one side of the flexible metal sheet, a worm gear disposed inside the adjustment component, a support rod fixedly disposed on one side of the flexible metal sheet, and two sleeve rods fixedly disposed on one side of the flexible metal sheet, one end of each sleeve rod having a threaded hole, and a lead screw being threaded inside the threaded hole; the support rod controls the flexible metal sheet to abut against the folded edge position, the worm gear controls the lead screw to rotate through the adjustment component, and the lead screw extends and retracts within the sleeve rods to control the flexible metal sheet to adhere to the surface of the head to be measured.
[0006] The adjustment assembly also includes a housing, with one end of the lead screw rotatably mounted inside the housing via a bearing.
[0007] The lead screw has a worm gear fixedly mounted on its outer side, and a rotating rod is installed inside the housing. Two worms are fixedly mounted on the outer side of the rotating rod, and the worms mesh with the worm gear. One end of the rotating rod is rotatably mounted inside the bottom of the housing via a bearing.
[0008] The other end of the rotating rod passes through the housing and extends upwards. A rotary knob is fixedly installed at the top of the rotating rod, and anti-slip texture is provided on the outer side of the rotary knob.
[0009] The outer side of the rotating rod is equipped with a counter, the support rod passes through the housing and extends to the outer side, and a handle is fixedly installed at one end of the support rod.
[0010] A horizontal bubble meter is fixedly installed at the top of the shell.
[0011] This utility model has at least the following beneficial effects:
[0012] This invention offers significant advantages in terms of ease of operation and vertical orientation observation. The device features a rotating handle with anti-slip textured edges for easy manual adjustment, reducing effort and slippage, making it suitable for gloved operation and enhancing human-machine comfort and stability. A handle at the end of the support rod is shaped to conform to grip habits and has an anti-slip surface, facilitating stable one-handed grip and application of positioning force, enabling efficient operation with simultaneous positioning and adjustment. A bubble level is located on the top of the housing, allowing for direct assessment of whether the device is positioned perpendicular to the end cap axis. A centered bubble indicates accurate measurement of the cross-section, preventing poor flexible sheet adhesion or measurement distortion due to device tilt. The observation window is strategically positioned with a clear view, facilitating readings even in dimly lit or confined spaces inside the end cap, reducing operational difficulty and improving measurement efficiency and accuracy. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the internal structure of the housing of this utility model;
[0015] Figure 3 This is a schematic diagram of the adjustment component structure of this utility model;
[0016] Figure 4 This is an enlarged schematic diagram of the structure at point A of this utility model.
[0017] In the diagram: 1. Flexible metal sheet; 2. Adjustment component; 201. Worm gear; 202. Housing; 203. Worm wheel; 204. Rotating rod; 205. Rotary knob; 206. Anti-slip texture; 207. Counter; 208. Handle; 209. Horizontal bubble meter; 3. Support rod; 4. Sleeve rod; 5. Threaded hole; 6. Lead screw. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1-4 This utility model provides a technical solution: a measuring device for the radius of curvature of a spun end cap, including a flexible metal sheet 1, an adjusting component 2, a support rod 3, a sleeve rod 4, a lead screw 6, and other core components. The flexible metal sheet 1 is made of a thin stainless steel sheet with a certain elasticity and rigidity. One end of the sheet is fixedly connected to one side of the adjusting component 2, while the other end is free and can conform to the curvature deformation. The flexible metal sheet 1 is used to closely conform to the inner surface of the end cap fold during the measurement process, serving as a sensing element to reflect the curvature change. The adjusting component 2 includes a housing 202, which is an integrated structure formed by die casting of aluminum alloy. It has a transmission cavity and a mounting position inside. A rotating rod 204 is arranged laterally in the transmission cavity of the housing 202. The rotating rod 204 is rotatably mounted on the bottom end and side wall of the housing 202 through two deep groove ball bearings to ensure smooth rotation. Two worm gears 201 are fixedly mounted on the outer periphery of the rotating rod 204, located symmetrically on both sides inside the housing 202.
[0020] Correspondingly, two lead screws 6 are also provided inside the housing 202. One end of each lead screw 6 is rotatably mounted on the inner wall of one side of the housing 202 via a thrust bearing, and the other end extends out of the housing 202 and is connected to the external sleeve 4. A worm gear 203 is fixedly mounted on each lead screw 6. The worm gear 203 meshes with the corresponding worm 201 to form a worm gear transmission pair, realizing the conversion of the rotational motion of the rotating rod 204 into the axial linear motion of the lead screw 6. Since the two sets of worm gear 203-worm wheel 203 transmission structures are driven synchronously, the extension and retraction of the lead screws 6 on both sides are consistent, avoiding the flexible metal sheet 1 from being subjected to uneven load. One end of the rotating rod 204 extends through the top of the housing 202 to the outside, and A rotary knob 205 is fixedly connected. The rotary knob 205 is disc-shaped and has anti-slip texture 206 on its outer circumference surface to facilitate manual rotation by the operator. By rotating the rotary knob 205, the rotating rod 204 and the two worm gears 201 can be driven to rotate synchronously, which in turn drives the worm wheels 203 on both sides and the lead screw 6 to rotate synchronously. The lead screw 6 is threaded through the threaded hole 5 at the end of the sleeve rod 4. The sleeve rod 4 is a hollow round tube structure and is fixed to one side of the flexible metal sheet 1. It is used to guide the lead screw 6 to only perform axial extension and retraction. When the lead screw 6 rotates, it moves axially along the sleeve rod 4 under the action of the thread, pushing the local area of the flexible metal sheet 1 to bend and deform, thereby adapting to the folded surface with different curvatures.
[0021] The support rod 3 is a rigid round rod. One end is fixedly connected to one side of the housing 202 and extends through the housing 202 to the outside. The other end is fixedly connected to a handle 208. During operation, the handle 208 is held to press the support rod 3 against one side of the end cap flange as a positioning fulcrum for the entire device, ensuring that the flexible metal sheet 1 fits the surface to be measured in a stable posture. Furthermore, a counter 207 is rotatably installed on the end of the rotating rod 204 located outside the housing 202. The counter 207 is a mechanical tachometer that is linked to the rotating rod 204 through gears or friction wheels. The counter 207 automatically records the total number of rotations of the rotating rod 204 (i.e., the worm gear 201) and calculates the axial displacement L using the formula L=P×N (P is the lead of the lead screw, and N is the number of rotations). A level bubble meter 209 is also fixedly installed at the top of the housing 202 to determine whether the device is in a horizontal state during the measurement process, preventing measurement errors caused by tilting and improving the accuracy of the measurement results.
[0022] In actual operation, the operator first confirms that the spun head to be tested is in a stable state, and that the surface of its corner folded edge area is clean and free of oxide scale, welding slag, or obvious deformation that may affect the fit. Then, the operator holds the handle 208 and gently places the measuring device in the folded edge area where the head cylinder and the spherical surface of the head transition. The operator adjusts the posture of the device so that the end of the support rod 3 is stably abutted against the inner wall plane area of the straight edge section of the head (i.e., the starting end of the cylinder). This plane serves as the reference positioning surface for measurement, ensuring that the entire device has a stable support point and a clear spatial orientation. At this time, one end of the flexible metal sheet 1 is fixed to the housing 202, and the other end is a free end, initially contacting the inner surface of the arc section of the head folded edge, but not yet fully fitted. By observing the gap distribution between the flexible metal sheet 1 and the folded edge surface, the operator can preliminarily determine whether the current device is in a roughly centered position. With the help of the horizontal bubble meter 209 installed on the top of the housing 202, the operator finely adjusts the posture of the device to observe the position of the bubble in the horizontal bubble meter. Ideally, the bubble should be centered between the two marking lines, meaning the surface is perfectly level. If the bubble is off to one side, it indicates that the device is tilted to that side. You need to adjust the surface to center the bubble and make its main axis as perpendicular as possible to the head axis to avoid projection deviation or unilateral force caused by tilting, thereby improving measurement accuracy.
[0023] After initial positioning is completed, the operator slowly rotates the rotary knob 205 clockwise. The rotation is transmitted to the worm gears 201 at both ends through the rotating rod 204. The worm gears 201 and the worm wheel 203 fixed on the lead screw 6 form a standard worm gear transmission pair. Since the worm gear has a self-locking characteristic, it can effectively prevent the lead screw 6 from retracting due to elastic rebound or gravity when there is no external force to reverse the direction, thus ensuring the structural stability during the measurement process. As the rotary knob 205 continues to rotate, the two lead screws 6 extend outward in axial direction synchronously under the thread drive (i.e., gradually advance from the thread hole 5 of the sleeve rod 4). Their extended ends push the middle and rear regions of the flexible metal sheet 1, causing it to gradually undergo elastic bending deformation. This deformation process simulates the envelope path of an ideal circular arc. The flexible metal sheet 1 continuously conforms to the actual curved surface profile of the end cap fold at multiple discrete points.
[0024] The operator visually inspects the fit between the flexible metal sheet 1 and the inner wall of the end cap, or uses a feeler gauge. When no visible gap is found between the entire flexible metal sheet 1 and the folded curved surface, and there is no local warping or excessive compression, it is considered that the "complete fit" has been achieved. At this time, the rotation knob 20 is stopped. At the same time, the counter 207 installed on the rotating rod 204 automatically records the total number of rotations of the rotating rod 204 (i.e., the worm gear 201) during the entire adjustment process, and the calibration data is fixed in the matching electronic reading module or provided in the operation manual for quick reading.
[0025] In use, by setting a rotary knob 205 at the top of the rotating rod 204 and opening anti-slip texture 206 (such as knurling or serrated protrusions) on the outside of the rotary knob 205, the operator can hold it stably with one hand and apply rotational torque to achieve precise control of the worm gear 201. This design significantly improves the friction and controllability of manual adjustment and avoids slippage. It can still be operated smoothly, especially when working with gloves or in a humid industrial environment, greatly enhancing the ergonomic adaptability of the device. Secondly, the handle 208 is fixedly set at one end of the support rod 3. Its shape is arc or T-shaped and the surface is provided with an anti-slip rubber sleeve, which makes it easy for the operator to hold and apply stable positioning pressure. When the device is placed inside the end cap for measurement, the operator can achieve one-handed positioning and adjustment through the handle 208 - holding the handle 208 with one hand to ensure that the support rod 3 is always pressed against the reference plane at the starting end of the fold, and rotating the rotary knob 205 with the other hand to drive the lead screw 6 to extend and retract, realizing efficient and stable dual-action coordination, significantly reducing the difficulty of operation and labor intensity.
[0026] Furthermore, a horizontal bubble level 209 is fixedly installed at the top of the housing 202. This device is a bubble level encapsulated in transparent material. Its axis is perpendicular to the extension direction of the flexible metal sheet 1 and parallel to the axis of the support rod 3. When the device is placed at the folded edge of the end cap, the operator can directly observe the position of the bubble in the horizontal bubble level 209 to determine whether the device is in a cross-sectional plane perpendicular to the axis of the end cap during the measurement process. If the bubble deviates from the center, it indicates that the device is tilted, which may cause the flexible metal sheet 1 to be misaligned, one side to be subjected to excessive force, or the measurement projection to be distorted. In this case, fine adjustments can be made. The device is angled until the bubble is centered, ensuring that the measured cross-section is the true cross-section and effectively avoiding systematic errors introduced by installation tilt. In addition, the horizontal bubble meter 209 is located at the high point of the top of the housing 202, with a wide field of view that is not obstructed by the flexible metal sheet 1 or the lead screw 6 structure. This allows the operator to clearly observe the bubble state even when squatting, looking up, or in a confined space. Combined with the reasonable layout of the rotary knob 205 and the handle 208, the entire device forms a three-in-one operation mode of "one hand for positioning, one eye for observing posture, and one hand for fine adjustment", which improves the intuitiveness and controllability of the measurement process.
[0027] In summary, by incorporating anti-slip texture 206, handle 208, and level bubble level 209, this utility model significantly improves the ease of operation and posture judgment of the device. It not only achieves a fast, stable, and fatigue-free operating experience, but also ensures the accuracy of the measurement benchmark through visual vertical calibration. This effectively solves the problems of traditional measuring tools being difficult to align, prone to tilting, and subjective readings under complex working conditions.
[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for measuring the corner bead radius of a spinning head, characterized in that: The device includes a flexible metal sheet, an adjustment assembly fixedly mounted on one side of the flexible metal sheet, a worm gear disposed inside the adjustment assembly, a support rod fixedly mounted on one side of the flexible metal sheet, and two sleeve rods fixedly mounted on one side of the flexible metal sheet. One end of each sleeve rod has a threaded hole, and a lead screw is threaded into the threaded hole. The support rod controls the flexible metal sheet to abut against the folded edge position, and the worm gear controls the rotation of the lead screw through the adjustment assembly. The lead screw extends and retracts within the sleeve rods to control the flexible metal sheet to conform to the surface of the end cap to be tested.
2. The device for measuring the radius of curvature of the spinning end cap according to claim 1, characterized in that: The adjustment assembly also includes a housing, and one end of the lead screw is rotatably mounted inside the housing via a bearing.
3. The device for measuring the radius of curvature of the spinning end cap according to claim 2, characterized in that: A worm gear is fixedly installed on the outer side of the lead screw, and a rotating rod is installed inside the housing. Two worms are fixedly installed on the outer side of the rotating rod. The worms mesh with the worm gear, and one end of the rotating rod is rotatably installed at the bottom of the housing via a bearing.
4. The device for measuring the radius of curvature of the spinning end cap according to claim 3, characterized in that: The other end of the rotating rod passes through the housing and extends upwards. A rotating knob is fixedly installed at the top of the rotating rod, and anti-slip texture is provided on the outer side of the rotating knob.
5. The device for measuring the radius of curvature of a spun head according to claim 4, characterized in that: A counter is rotatably mounted on the outer side of the rotating rod, the support rod passes through the housing and extends to the outer side, and a handle is fixedly mounted on one end of the support rod.
6. The device for measuring the radius of curvature of a spun head according to claim 5, characterized in that: A horizontal bubble meter is fixedly installed at the top of the housing.