Special caliper for measuring symmetry degree of key groove of circular mould
By designing a lightweight, portable caliper, the problem of measuring the symmetry of the ring die keyway was solved, enabling efficient and accurate measurement on the production site and meeting the tolerance requirements for the distance between the center plane of the ring die and the center plane of the keyway.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN MEISHAN SHANBAO MASCH MOLD CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies make it difficult to achieve accurate measurement of the symmetry of ring die keyways, especially since the ring die has a large diameter, is heavy, and is difficult to move to a coordinate measuring machine. Furthermore, traditional measuring tools cannot accurately align the measurement reference with the center of the ring die, resulting in low measurement efficiency.
A lightweight and portable caliper was designed. It is fixed in the keyway of the ring die by a short caliper foot and abutment rod on the caliper body. The long caliper foot slides along the caliper body and abuts against the outside of the ring die. The cooperation of the fixing plate and the scale plate ensures the accuracy and stability of the measurement reference.
This technology enables direct measurement of the symmetry of the ring die keyway on the production site, reducing testing costs and operational complexity, improving measurement accuracy and efficiency, and meeting the tolerance requirements for the distance between the center plane of the ring die and the center plane of the keyway.
Smart Images
Figure CN224285696U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of measuring calipers, specifically a special caliper for measuring the symmetry of keyways in ring molds. Background Technology
[0002] As a core piece of equipment in biomass fuel and feed processing, the pellet mill's ring die is a key component for material extrusion molding. The ring die is typically a large-diameter annular structure, weighing up to several hundred kilograms, and its end face is machined with a keyway for transmitting torque. The machining accuracy of the keyway directly affects the stability of the fit between the ring die and the drive shaft, as well as the reliability of the equipment operation. Among these, the symmetry of the keyway's center plane relative to the ring die's center plane is one of the core technical indicators—according to equipment assembly requirements, the keyway's center plane must be strictly located within two parallel planes parallel to each other on either side of the ring die's center plane, with a distance between them within a tolerance zone.
[0003] Currently, the conventional methods for measuring the symmetry of keyways in mechanical parts mainly rely on coordinate measuring machines (CMMs) or traditional measuring tools. However, the special structure and dimensions of the ring die present significant challenges to the measurement: on the one hand, the ring die has a large diameter and is heavy, making it difficult to move to the CMM's inspection platform, and production lines typically lack the conditions for precise CMM inspection; on the other hand, traditional measuring tools cannot effectively complete the accurate measurement of symmetry due to problems such as difficulty in aligning the measurement reference with the center of the ring die, insufficient coverage of measurement points, and limited operating space. In addition, existing tools can usually only measure symmetry or keyway width individually, failing to acquire both key parameters simultaneously, resulting in low measurement efficiency.
[0004] Therefore, a special caliper is needed to measure the symmetry of the keyway in a ring die to improve the above-mentioned problem. Utility Model Content
[0005] The purpose of this invention is to provide a special caliper for measuring the symmetry of keyways in ring molds, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A special caliper for measuring the symmetry of a ring die keyway includes a caliper body, on which a short caliper foot and a long caliper foot are slidably disposed. A fine adjustment component is disposed on one side of the short caliper foot and is slidably disposed on the outside of the caliper body. Locking components are provided on the short caliper foot, the long caliper foot, and the fine adjustment component to fix the short caliper foot, the long caliper foot, and the fine adjustment component to the caliper body and restrict their sliding.
[0008] A contact rod b is connected to the upper end of one side of the ruler body. The contact rod b and the short locking foot are fixed together in the keyway of the ring mold. The long locking foot moves along the length of the ruler body until it abuts against the outer side of the ring mold.
[0009] As a preferred embodiment of this utility model, the short locking foot includes a short locking foot, an abutment rod c is fixedly connected to one side of the upper end of the short locking foot, and a fixing plate b and a scale plate b are fixedly connected to the back of the short locking foot by screws respectively. The short locking foot moves smoothly along the length direction of the ruler body through the fixing plate b and the scale plate b.
[0010] As a preferred embodiment of this utility model, the fine-tuning component includes a fine-tuning structure, which is slidably positioned on the outer side of the ruler body. A slot is provided at the bottom end of the fine-tuning structure, and a screw is inserted through the middle of the slot. One end of the screw is fixedly connected to one side of the lower end of the ruler body, and a rotating nut is threaded onto the outer side of the screw.
[0011] As a preferred embodiment of this utility model, the long locking foot includes a long locking foot, and an abutment rod a is fixedly connected to one side of the upper end of the long locking foot. A fixing plate a and a scale plate a are fixedly connected to the back of the long locking foot by a number of screws. The long locking foot remains stable during movement through the fixing plate a and the scale plate a.
[0012] As a preferred embodiment of this utility model, an extension ruler is fixedly connected to one side of the lower end of the long clamping foot, and a fixing piece c is fixedly connected to the back of the extension ruler by several screws.
[0013] As a preferred embodiment of this utility model, the locking component is a locking screw.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] This utility model addresses the problem of large diameter, heavy weight, and difficulty in moving ring dies to a coordinate measuring machine. This caliper, through its lightweight and portable design, can be used directly on the production line without moving the ring die, meeting the actual testing needs of the production site and reducing testing costs and operational complexity.
[0016] In this invention, the short locking foot and the abutment rod b of the ruler body are fixed together in the keyway of the ring die, and the long locking foot slides along the ruler body and abuts against the outside of the ring die. This structure effectively solves the problem that the measurement reference of traditional measuring tools is difficult to align with the center of the ring die. At the same time, the short locking foot and the long locking foot, through the cooperation of the fixing plate and the scale plate, ensure that the movement process is smooth, avoid insufficient coverage or offset of the measurement point, and significantly improve the accuracy of symmetry measurement. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the usage state of this utility model;
[0018] Figure 2 This is a top view of the utility model in use;
[0019] Figure 3 This is a first-view perspective three-dimensional structural diagram of the present invention;
[0020] Figure 4 This is a second-view three-dimensional structural diagram of the present invention.
[0021] In the diagram: 1. Ring mold; 2. Ruler body; 3. Long clamping foot; 4. Extension ruler; 5. Abutment rod a; 6. Short clamping foot; 7. Abutment rod b; 8. Fine-tuning structure; 9. Screw; 10. Abutment rod c; 11. Scale plate b; 12. Fixing plate b; 13. Slotted part; 14. Rotating nut; 15. Fixing plate c; 16. Fixing plate a; 17. Locking screw; 18. Scale plate a. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0023] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0026] Please see Figure 1-4 This utility model provides a technical solution:
[0027] For an example, please refer to... Figure 1 , 23 and 4, a special caliper for measuring the symmetry of a ring die keyway, includes a scale body 2, on which a short caliper and a long caliper are slidably disposed. A fine adjustment component is disposed on one side of the short caliper and is slidably disposed on the outside of the scale body 2. Locking components are provided on the short caliper, the long caliper, and the fine adjustment component. The locking components are locking screws 17, which are used to fix the short caliper, the long caliper, and the fine adjustment component on the scale body 2 to restrict their sliding. An abutment rod b7 is connected to the upper end of one side of the scale body 2. The abutment rod b7 and the short caliper are fixed together in the keyway of the ring die 1. The long caliper moves along the length of the scale body 2 until it abuts against the outside of the ring die 1.
[0028] During measurement, the short clamping foot and the abutment rod b7 of the scale body 2 work together to complete the initial positioning and fixation of the keyway of the ring mold 1. The short clamping foot consists of a short clamping foot 6, an abutment rod c10, a fixing piece b12, and a scale piece b11. The abutment rod c10 at the upper end of the short clamping foot 6 and the abutment rod b7 at the upper end of the scale body 2 abut against the inner walls on both sides of the keyway, forming a two-point clamping, which initially fixes the caliper as a whole in the keyway of the ring mold 1, ensuring that the measurement reference is consistent with the center plane of the ring mold 1. At the same time, the fixing piece b12 and the scale piece b11 on the back of the short clamping foot 6 are in contact with the surface of the scale body 2, so that the short clamping foot 6 remains stable when sliding along the length of the scale body 2, avoiding deviation that affects the reference alignment.
[0029] After initial fixation, the outer side of the ring mold 1 needs to be contacted and its dimensions read using the long clamping feet:
[0030] The long locking foot component includes a long locking foot 3, an abutment rod a5, a fixing plate a16, a scale plate a18, and an extension ruler 4. The long locking foot 3 can slide along the length of the ruler body 2. The abutment rod a5 at its upper end must eventually make close contact with the outer wall of the ring mold 1. The fixing plate a16 and the scale plate a18 on the back of the long locking foot 3 also fit against the surface of the ruler body 2 to ensure stability during movement.
[0031] Locking screws 17 are provided on the foot clamps, long foot clamps, and fine-tuning components: after each component is adjusted to the target position, tightening the locking screws 17 can lock the corresponding component on the scale body 2, preventing positional shifts caused by vibration or operational errors during measurement and ensuring the stability of measurement data.
[0032] Please refer to Figure 1 , 23 and 4, the short locking foot component includes a short locking foot 6, with an abutment rod c10 fixedly connected to one side of the upper end of the short locking foot 6. A fixing plate b12 and a scale plate b11 are fixedly connected to the back of the short locking foot 6 by screws. The short locking foot 6 moves smoothly along the length direction of the ruler body 2 through the fixing plate b12 and the scale plate b11. The fine adjustment component includes a fine adjustment structure 8, which is limited and slidably disposed on the outside of the ruler body 2. A slot 13 is opened at the bottom end of the fine adjustment structure 8, and a screw 9 is inserted through the middle of the slot 13. One end of the screw 9 is fixedly connected to one side of the lower end of the ruler body 2, and a rotating nut 14 is threadedly connected to the outside of the screw 9.
[0033] The fine-tuning structure 8 is limited and slidably positioned on the outside of the scale body 2. The slot 13 at its bottom end passes through the screw 9, one end of which is fixed to the lower end of the scale body 2. By rotating the rotating nut 14, the fine-tuning structure 8 can be moved at the millimeter level or even more precisely along the length of the scale body 2. This fine-tuning function can assist the short locking foot 6 in position correction, ensuring closer contact between the abutting rod b7, the abutting rod c10 and the inner wall of the keyway, as well as between the abutting rod a5 and the outer wall of the ring die 1, thereby further improving measurement accuracy.
[0034] Please refer to Figure 1 , 2 3 and 4, the long clamping foot includes a long clamping foot 3, an abutment rod a5 is fixedly connected to the upper side of the long clamping foot 3, a fixing plate a16 and a scale plate a18 are fixedly connected to the back of the long clamping foot 3 by several screws, the long clamping foot 3 remains stable when moving by the fixing plate a16 and the scale plate a18, an extension ruler 4 is fixedly connected to the lower side of the long clamping foot 3, and a fixing plate c15 is fixedly connected to the back of the extension ruler 4 by several screws.
[0035] The specific measurement procedure is as follows:
[0036] When measuring from the front: Reference Figure 4 Pull the long locking foot 8 to the right, and place the widened locking feet of the scale body 1 and the short locking foot 2 into the keyway. While pulling the short locking foot 6 open, the step of the abutment rod c10 is flush with the cylindrical surface of the ring die stop. Then lock the screw 17, rotate the nut 14 to finely adjust the tension of the abutment rod c10 in the keyway, so that the abutment rod c10 and the abutment rod b7 are in contact with the two sides of the keyway. Then lock the screw 17, pull the long locking foot 8 to the left until it rests against the ring die positioning stop. At this time, lock the screw 17 to read the measurement value A of the scale plate 15 and the measurement value C of the scale plate 12.
[0037] When measuring from the reverse side: Reference Figure 3Pull the abutment rod a5 to the left, and at the same time pull the short clamping foot 6 open, the step of the abutment rod c10 is flush with the cylindrical surface of the ring die stop. Then lock the screw 17, rotate the nut 14 to finely adjust the tension of the clamping foot in the keyway, so that the abutment rod c10 and the abutment rod b7 are in contact with the two sides of the keyway. Then lock the screw 17, pull the long clamping foot 3 to the right until it rests against the ring die positioning stop. At this time, the locking screw 17 reads the measurement value B of the scale plate 15, and the width dimension of the keyway is the measurement value C. Calculate the keyway symmetry deviation = (AB) / 2 mm.
[0038] 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 special caliper for measuring the symmetry of a ring die keyway, comprising a caliper body (2), characterized in that: The ruler body (2) is slidably provided with a short locking foot and a long locking foot. A fine adjustment component is provided on one side of the short locking foot. The fine adjustment component is slidably provided on the outside of the ruler body (2). Locking components are provided on the short locking foot, the long locking foot and the fine adjustment component to fix the short locking foot, the long locking foot and the fine adjustment component on the ruler body (2) to restrict their sliding. A contact rod b (7) is connected to the upper end of one side of the ruler body (2). The contact rod b (7) and the short clamping foot are fixed together in the keyway of the ring mold (1). The long clamping foot moves along the length of the ruler body (2) until it abuts against the outer side of the ring mold (1).
2. The special caliper for measuring the symmetry of ring die keyways according to claim 1, characterized in that: The short locking foot includes a short locking foot (6), and an abutment rod c (10) is fixedly connected to one side of the upper end of the short locking foot (6). A fixing plate b (12) and a scale plate b (11) are fixedly connected to the back of the short locking foot (6) by screws. The short locking foot (6) moves smoothly along the length direction of the ruler body (2) through the fixing plate b (12) and the scale plate b (11).
3. The special caliper for measuring the symmetry of ring die keyways according to claim 2, characterized in that: The fine-tuning component includes a fine-tuning structure (8), which is slidably positioned on the outside of the ruler body (2). The bottom end of the fine-tuning structure (8) has a slot (13), and a screw (9) is inserted through the middle of the slot (13). One end of the screw (9) is fixedly connected to one side of the lower end of the ruler body (2), and a rotating nut (14) is threaded onto the outside of the screw (9).
4. The special caliper for measuring the symmetry of ring die keyways according to claim 3, characterized in that: The long locking foot includes a long locking foot (3), and an abutment rod a (5) is fixedly connected to one side of the upper end of the long locking foot (3). A fixing plate a (16) and a scale plate a (18) are fixedly connected to the back of the long locking foot (3) by several screws. The long locking foot (3) remains stable when moving by the fixing plate a (16) and the scale plate a (18).
5. The special caliper for measuring the symmetry of ring die keyways according to claim 4, characterized in that: An extension ruler (4) is fixedly connected to one side of the lower end of the long clamp (3), and a fixing plate c (15) is fixedly connected to the back of the extension ruler (4) by several screws.
6. The special caliper for measuring the symmetry of ring die keyways according to claim 5, characterized in that: The locking component is a locking screw (17).