Coaxial adjusting tool for inner cylinder and outer cylinder

Abstract

According to the coaxial adjusting tool for the inner cylinder and the outer cylinder, the adjusting tool comprises an outer clamping jaw assembly and an inner clamping jaw assembly which are coaxially connected, and the outer clamping jaw assembly can automatically adapt to the change of the shape and size of the outer cylinder through a synchronous linkage mechanism of an outer positioning jaw and quickly and accurately find and lock the circle center position of the outer cylinder. An inner positioning claw of the inner clamping claw assembly can act on the inner cylinder, automatic centering and reliable positioning of the inner cylinder are achieved, and it is guaranteed that the inner cylinder and the outer cylinder have good concentricity. The positioning claw is driven by a crank, and the inner positioning mechanism and the outer positioning mechanism can be synchronously controlled through simple rotating action, so that the operation convenience is greatly improved. An integrated ratchet wheel and ratchet locking mechanism can automatically achieve mechanical locking after positioning is completed, and position deviation caused by external force or vibration in operation is prevented. In addition, based on a ratchet wheel and ratchet locking mechanism, the locking state of the inner positioning assembly and the outer positioning assembly can be rapidly released through single action, rapid detachment of the whole mechanism is achieved, and the requirement for efficient operation is met.

Description

Technical Field

[0001] This invention relates to the field of workpiece positioning device technology, and in particular to a coaxial adjustment fixture for inner and outer cylinders. Background Technology

[0002] In shipbuilding and the installation of large equipment in factories, the installation of coaxial pipes is a common but highly demanding operation. This type of installation has strict technical standards for pipe coaxiality, the accuracy of which directly affects media transport efficiency, equipment operational stability, and the overall lifespan of the system. Traditional installation methods mainly rely on manual measurement using conventional measuring tools (such as calipers, dial indicators, and levels) to determine the center position of the inner and outer pipe cross-sections by collecting data point by point, and then adjusting the pipe section to the theoretical axis. However, this step-by-step, point-by-point measurement method has significant limitations: firstly, because the center of the inner and outer pipes needs to be located separately, measurement errors accumulate in each positioning stage, forming a large cumulative error, causing the final coaxiality to deviate from the design requirements; secondly, the process involves repeated measurements, adjustments, and verifications, which is cumbersome, consumes a lot of time, and significantly affects the overall installation efficiency. Therefore, traditional measurement methods not only struggle to guarantee accuracy but also cause unnecessary waste in project timelines and labor costs. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the present invention provides a coaxial adjustment fixture for inner and outer cylinders, the coaxial adjustment fixture including an outer jaw assembly and an inner jaw assembly coaxially connected;

[0004] The outer locating claw assembly includes a ring frame. The front end face of the ring frame is provided with multiple hinge holes evenly arranged in the circumferential direction. The outer locating claw is hinged to the ring frame through the hinge holes and can rotate around the hinge holes relative to the ring frame. A first protrusion is provided in the middle of the front surface of the outer locating claw. The outer locking disc includes a cylindrical part and a protruding ring part connected to the front edge of the cylindrical part. The outer edge of the protruding ring part away from the axis is connected to a guide bar arranged in the radial direction. The guide bar has a strip-shaped hole inside. Multiple guide bars are evenly arranged in the circumferential direction of the protruding ring part.

[0005] The outer wall of the outer locking disc cylindrical part contacts the inner wall of the annular frame. The first protrusion of the outer positioning claw passes through the strip hole of the guide bar, so that the outer locking disc can rotate around the axis relative to the annular frame. At the same time, it drives multiple outer positioning claws to rotate synchronously around the hinge hole, so that the end of the outer positioning claw away from the hinge hole abuts against the inner wall of the outer cylinder.

[0006] Optionally, the external locking pawl is connected to the annular frame through a mounting hole on the annular frame. The outer edge of the convex ring of the external locking disc is provided with ratchet teeth. The external locking pawl is connected to a torsion spring and abuts against the ratchet teeth under the preload of the torsion spring to restrict the unidirectional rotation of the external locking disc.

[0007] Optionally, the outer wall surface of the outer locking disc cylindrical part contacts the inner wall surface of the annular frame, the inner wall surface of the annular frame is provided with an annular groove, and the outer locking disc cylindrical part is provided with a radially threaded through hole; after the outer locking disc cylindrical part is inserted into the annular frame, a set screw is screwed into the threaded through hole from the inner wall surface of the cylindrical part outward, and the end of the set screw enters the annular groove.

[0008] Optionally, the number of external positioning claws is 6, and the number of guide bars is equal to the number of external positioning claws.

[0009] Optionally, the inner claw assembly includes an inner positioning claw, and the front end face of the outer locking disc is connected to a plurality of inner positioning claws that are evenly arranged in the circumferential direction. The first end of the inner positioning claw is hinged to the outer locking disc, and a second protrusion is provided in the middle of the front surface of the inner positioning claw.

[0010] The inner edge of the annular inner locking disc near the axis is connected to a straight groove facing inward. The inner locking disc is coaxially set on the front side of the outer locking disc. The second protrusion passes into the straight groove, and the inner cylinder passes through the central through hole of the inner locking disc. The inner locking disc can rotate relative to the outer locking disc around the axis, and at the same time drive multiple inner positioning claws to rotate synchronously around the first end, so that the second end of the inner positioning claw away from the hinge hole of the first end abuts against the outer cylinder wall of the inner cylinder, realizing the coaxial fixation of the inner cylinder and the outer cylinder.

[0011] Optionally, a threaded hole is provided on the front end face of the outer locking disc, and the outer locking handle is connected to the threaded hole through the tail thread so as to rotate the outer locking disc by the outer locking handle.

[0012] Optionally, the inner locking disc has a first arc-shaped groove and a second arc-shaped groove arranged circumferentially on its surface. The outer locking handle passes through the first arc-shaped groove, and a circular plate is fitted on the outer locking handle. The circular plate contacts the front end face of the first arc-shaped groove. The locking disc retainer passes through the second arc-shaped groove from the front end face and is fastened to the outer locking disc. The retainer cap of the locking disc retainer provides a limiting effect on the inner locking disc to prevent it from disengaging.

[0013] Optionally, the outer edge of the inner locking disc is provided with ratchet teeth, which cooperate with the inner locking pawl hinged to the front end face of the outer locking disc, so that the inner locking disc can only rotate in one direction relative to the outer locking disc.

[0014] Optionally, the inner locking handle is connected to the front end face of the inner locking disc so as to rotate the inner locking disc by means of the inner locking handle.

[0015] Optionally, the number of internal positioning claws is three.

[0016] As described above, the present invention provides a coaxial adjustment fixture for inner and outer cylinders, which has the following beneficial effects:

[0017] (1) Accurate and reliable external positioning: Through the synchronous linkage mechanism of six external positioning claws, it can automatically adapt to the changes in the shape and size of the outer cylinder, quickly and accurately find and lock the center position of the outer cylinder, effectively overcoming the positioning error caused by offset or uneven clamping in traditional positioning methods.

[0018] (2) Stable and accurate internal positioning: It has three built-in internal positioning claws, which can act on the inner cylinder respectively to realize the automatic centering and reliable positioning of the inner cylinder, ensuring good concentricity between the inner and outer cylinders, and is suitable for cylinder structures with different diameter ranges.

[0019] (3) Convenient and efficient operation: The positioning claw adopts a crank-driven method, which can control the opening and closing of the inner and outer positioning mechanisms simultaneously through a simple rotation action, greatly improving the convenience of operation and work efficiency, and reducing the labor intensity of operators.

[0020] (4) The locking mechanism is safe and reliable: It integrates a ratchet and ratchet locking mechanism, which can automatically achieve mechanical locking after positioning, preventing position displacement caused by external force or vibration during operation, and enhancing the stability and safety of the equipment in continuous use.

[0021] (5) Quick and easy disassembly: It is equipped with a special pawl release mechanism, which can quickly release the locking state of the inner and outer positioning devices with a single action, realize the rapid disassembly of the entire mechanism, facilitate the transfer and reuse of the equipment, and meet the needs of efficient operation. Attached Figure Description

[0022] Figure 1 The diagram shown is the assembly drawing of the coaxial adjustment fixture in this invention.

[0023] Figure 2 The diagram shown is an assembly drawing of the outer claw assembly in this invention.

[0024] Figure 3 The diagram shown is an exploded view of the external claw assembly in this invention.

[0025] Figure 4 The diagram shown is an exploded view of the assembly of the outer locking disc and the ring frame in this invention.

[0026] Figure 5 The diagram shows the assembly of the outer locking disc and the ring frame in this invention.

[0027] Figure 6 The diagram shown is an assembly drawing of the inner claw assembly in this invention.

[0028] Figure 7 The diagram shown is an exploded view of the inner claw assembly in this invention.

[0029] Figure 8 The diagram shown is a schematic representation of the internal locking pawl in this invention.

[0030] Component designation explanation

[0031] 1. Circular frame; 2. Outer positioning claw; 3. Outer locking disc; 4. Outer locking crank; 5. Outer locking pawl; 6. Set screw; 7. Inner positioning claw; 8. Inner locking disc; 9. Inner locking crank; 10. Locking disc clip; 11. Inner locking pawl. 1a. Circular groove; 1b. Hinge hole; 1c. Mounting hole; 1d. Center through hole; 2a. First protrusion; 2b. End opening; 3a. Guide bar; 3b. Threaded hole; 3c. Threaded through hole; 3d. Racket; 3e. Cylindrical part; 4a. Circular plate; 7a. Second protrusion; 8a. Racket; 8b. First arc groove; 8c. Second arc groove; 8d. Straight groove; 11a. Detailed Implementation

[0032] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0033] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0034] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0035] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0036] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0037] like Figure 1 As shown, the present invention provides a coaxial adjustment fixture for inner and outer cylinders, the coaxial adjustment fixture including an outer jaw assembly A and an inner jaw assembly B coaxially connected:

[0038] like Figure 2 , Figure 3 As shown, the outer chuck assembly A includes a ring frame 1, an outer positioning chuck 2, an outer locking disc 3, an outer locking crank 4, an outer locking pawl 5, and a set screw 6.

[0039] The front end face of the annular frame 1 is provided with a plurality of hinge holes 1b evenly arranged circumferentially. The outer positioning claw 2 is provided with an end opening 2b. The outer positioning claw 2 is hinged to the annular frame 1 through the hinge holes 1b and can rotate around the hinge holes 1b relative to the annular frame 1. A first protrusion 2a is provided in the middle of the front surface of the outer positioning claw 2. In this embodiment, there are 6 outer positioning claws 2, and all 6 outer positioning claws 2 are assembled in the same way.

[0040] The outer locking disc 3 includes a cylindrical part 3e and a convex ring part connected to the front edge of the cylindrical part. The outer edge of the convex ring part away from the axis is connected to a guide bar 3a arranged radially. The guide bar 3a has a strip-shaped hole inside. Multiple guide bars 3a are evenly arranged along the circumference of the convex ring part. The number of guide bars 3a is equal to the number of outer positioning claws 2.

[0041] The outer wall surface of the cylindrical part 3e of the outer locking disc 3 contacts the inner wall surface of the annular frame 1. The first protrusion 2a of the outer positioning claw 2 passes into the strip hole of the guide strip 3a, so that the outer locking disc 3 can rotate around the axis relative to the annular frame 1. At the same time, it drives multiple outer positioning claws 2 to rotate synchronously around the hinge hole 1b, so that the end of the outer positioning claw 2 away from the hinge hole 1b abuts against the inner wall of the outer cylinder.

[0042] Furthermore, the external locking pawl 5 is connected to the annular frame 1 via the mounting hole 1c on the annular frame 1. The outer edge of the convex ring of the external locking disc 3 is provided with ratchet teeth 3d. The external locking pawl 5 is connected to a torsion spring and abuts against the ratchet teeth 3d under the preload of the torsion spring to restrict the unidirectional rotation of the external locking disc 3. The ratchet teeth and pawl here are mature mechanisms, and their principles will not be described in detail.

[0043] Furthermore, a threaded hole 3b is provided on the front end face of the outer locking disc 3, and the outer locking handle 4 is connected to the threaded hole 3b through the tail end thread, so that the outer locking disc 3 can be rotated by the outer locking handle 4.

[0044] Furthermore, such as Figure 4 , Figure 5 As shown, the outer wall surface of the cylindrical portion 3e of the outer locking disc 3 contacts the inner wall surface of the annular frame 1. The inner wall surface of the annular frame 1 is provided with an annular groove 1a, and the cylindrical portion of the outer locking disc 3 is provided with a radially threaded through hole 3c; combined with Figure 5 After the cylindrical part of the outer locking disc 3 is inserted into the annular frame 1, the set screw 6 is screwed into the threaded through hole 3c from the inner wall surface of the cylindrical part 3e outward. The end of the set screw 6 enters the annular groove 1a. With this connection, the outer locking disc 3 can rotate relative to the annular frame 1 around its own rotation axis, but the two cannot be separated.

[0045] Furthermore, similar to the assembly form of the external claw assembly A, such as... Figures 6 to 8 As shown, the inner locking claw assembly B includes an inner positioning claw 7, an inner locking disc 8, an inner locking crank 9, a locking disc pin 10, and an inner locking ratchet 11.

[0046] The front end face of the outer locking disc 3 is connected to a plurality of inner positioning claws 7 evenly arranged in the circumferential direction. The first end of the inner positioning claw 7 is hinged to the outer locking disc 3, and a second protrusion 7a is provided in the middle of the front surface of the inner positioning claw 7.

[0047] The annular inner locking disc 8 has a straight groove 8d facing inward connected to its inner edge near the axis. The inner locking disc 8 is coaxially positioned on the front side of the outer locking disc 3. The second protrusion 7a passes through the straight groove 8d, and the inner cylinder passes through the central through hole of the inner locking disc 8. The inner locking disc 8 can rotate relative to the outer locking disc 3 around its axis, simultaneously driving multiple inner positioning claws 7 to rotate synchronously around their first ends. This causes the second ends of the inner positioning claws 7, away from the hinge holes 1b at the first ends, to abut against the outer wall of the inner cylinder, achieving coaxial fixation between the inner and outer cylinders. The number of inner positioning claws 7 is three.

[0048] Furthermore, the inner locking disc 8 has a first arc-shaped groove 8b and a second arc-shaped groove 8c arranged circumferentially. The outer locking handle 4 passes through the first arc-shaped groove 8b, and a circular plate 4a is fitted on the outer locking handle 4. The circular plate 4a contacts the front end face of the first arc-shaped groove 8b to limit the inner locking disc 8 and prevent it from disengaging. The locking disc retainer 10 passes through the second arc-shaped groove 8c from its front end face and is fastened to the outer locking disc 3. The retainer cap of the locking disc retainer 10 also limits the inner locking disc 8 to prevent it from disengaging. With this connection, the inner locking disc 8 can only rotate relative to the outer locking disc 3, and the two cannot be separated.

[0049] Furthermore, the outer edge of the inner locking disc 8 is provided with ratchet teeth 8a, which engage with the inner locking pawl 11 hinged to the front end face of the outer locking disc 3, so that the inner locking disc 8 can only rotate in one direction relative to the outer locking disc 3. The inner locking handle 9 is connected to the front end face of the inner locking disc 8, so that the inner locking disc 8 can be rotated by the inner locking handle 9.

[0050] The process of using the above coaxial adjustment fixture is as follows:

[0051] Combination Figure 1 , Figure 2 , Figure 6 The adjustment fixture is placed into the outer cylinder with a larger diameter pipe. The outer locking handle 4 is rotated clockwise, causing the outer locking disc 3 to rotate. The guide strip 3a on the outer locking disc 3 forces the outer positioning pawl 2 to rotate clockwise around the hinge hole 1b until the outer positioning pawl 2 contacts the inner wall of the outer cylinder and is tightly pressed against it. At this point, under the restriction of the ratchet and pawl, the outer locking disc 3 cannot rotate in the opposite direction. Therefore, the outer positioning pawl 2 is tightly pressed against the inner wall of the outer cylinder, and the positioning is reliable. The inner cylinder with a smaller diameter pipe is inserted into the center through hole 1d of the annular frame 1. The inner locking handle 9 is rotated clockwise. Using the same principle, the inner locking disc 8 forces the inner positioning pawl 7 to rotate counterclockwise around the end rotation axis, finally clamping the outer wall of the inner cylinder, thus achieving coaxial positioning of the inner and outer pipes. After the assembly process is completed, it is only necessary to move the actuating pin 11a on the corresponding inner locking pawl 11 of the inner and outer locking discs (in conjunction with...). Figure 8 This allows the locking mechanism between the device and the inner and outer pipe fittings to be released, thereby dismantling the positioning mechanism.

[0052] In summary, this invention provides a coaxial adjustment fixture for inner and outer cylinders. This fixture includes an outer jaw assembly and an inner jaw assembly coaxially connected. The outer jaw assembly, through a synchronous linkage mechanism of the outer positioning jaw, can automatically adapt to changes in the shape and size of the outer cylinder, quickly and accurately finding and locking the center position of the outer cylinder. The inner positioning jaw of the inner jaw assembly can act on the inner cylinder, achieving automatic centering and reliable positioning of the inner cylinder, ensuring good concentricity between the inner and outer cylinders. Simultaneously, the positioning jaws are driven by a crank handle, allowing for simultaneous control of the opening and closing of the inner and outer positioning mechanisms through a simple rotational motion, significantly improving operational convenience and work efficiency. The integrated ratchet and ratchet locking mechanism automatically achieves mechanical locking after positioning, preventing positional displacement due to external forces or vibrations during operation, enhancing the stability and safety of the equipment during continuous use. Furthermore, based on the ratchet and ratchet locking mechanism, the locking state of the inner and outer positioning components can be quickly released with a single action, enabling rapid disassembly of the entire mechanism and meeting the requirements of efficient operation.

[0053] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A coaxial adjustment fixture for inner and outer cylinders, characterized in that, The coaxial adjustment fixture includes an outer jaw assembly and an inner jaw assembly that are coaxially connected. The outer locating claw assembly includes a ring frame. The front end face of the ring frame is provided with multiple hinge holes evenly arranged in the circumferential direction. The outer locating claw is hinged to the ring frame through the hinge holes and can rotate around the hinge holes relative to the ring frame. A first protrusion is provided in the middle of the front surface of the outer locating claw. The outer locking disc includes a cylindrical part and a protruding ring part connected to the front edge of the cylindrical part. The outer edge of the protruding ring part away from the axis is connected to a guide bar arranged in the radial direction. The guide bar has a strip-shaped hole inside. Multiple guide bars are evenly arranged in the circumferential direction of the protruding ring part. The outer wall of the outer locking disc cylindrical part contacts the inner wall of the annular frame. The first protrusion of the outer positioning claw passes through the strip hole of the guide bar, so that the outer locking disc can rotate around the axis relative to the annular frame. At the same time, it drives multiple outer positioning claws to rotate synchronously around the hinge hole, so that the end of the outer positioning claw away from the hinge hole abuts against the inner wall of the outer cylinder.

2. The coaxial adjustment fixture for inner and outer cylinders according to claim 1, characterized in that: The external locking pawl is connected to the ring frame through a mounting hole. The outer edge of the convex ring of the external locking disc is provided with ratchet teeth. The external locking pawl is connected to a torsion spring and abuts against the ratchet teeth under the preload of the torsion spring to restrict the unidirectional rotation of the external locking disc.

3. The coaxial adjustment fixture for inner and outer cylinders according to claim 1, characterized in that: The outer wall surface of the outer locking disc cylindrical part contacts the inner wall surface of the annular frame. The inner wall surface of the annular frame is provided with an annular groove. The outer locking disc cylindrical part is provided with a radially threaded through hole. After the outer locking disc cylindrical part is inserted into the annular frame, a set screw is screwed into the threaded through hole from the inner wall surface of the cylindrical part outward. The end of the set screw enters the annular groove.

4. The coaxial adjustment fixture for inner and outer cylinders according to claim 1, characterized in that: There are 6 external positioning claws, and the number of guide bars is equal to the number of external positioning claws.

5. The coaxial adjustment fixture for inner and outer cylinders according to claim 1, characterized in that: The inner claw assembly includes an inner positioning claw. The front end face of the outer locking disc is connected to a plurality of inner positioning claws that are evenly arranged in the circumferential direction. The first end of the inner positioning claw is hinged to the outer locking disc. A second protrusion is provided in the middle of the front surface of the inner positioning claw. The inner edge of the annular inner locking disc near the axis is connected to a straight groove facing inward. The inner locking disc is coaxially set on the front side of the outer locking disc. The second protrusion passes into the straight groove, and the inner cylinder passes through the central through hole of the inner locking disc. The inner locking disc can rotate relative to the outer locking disc around the axis, and at the same time drive multiple inner positioning claws to rotate synchronously around the first end, so that the second end of the inner positioning claw away from the hinge hole of the first end abuts against the outer cylinder wall of the inner cylinder, realizing the coaxial fixation of the inner cylinder and the outer cylinder.

6. The coaxial adjustment fixture for inner and outer cylinders according to claim 5, characterized in that: The front end face of the outer locking disc is provided with a threaded hole, and the outer locking handle is connected to the threaded hole through the tail thread, so that the outer locking disc can be rotated by the outer locking handle.

7. The coaxial adjustment fixture for inner and outer cylinders according to claim 6, characterized in that: The inner locking disc has a first arc-shaped groove and a second arc-shaped groove arranged circumferentially on its surface. The outer locking handle passes through the first arc-shaped groove and is fitted with a circular plate. The circular plate contacts the front end face of the first arc-shaped groove. The locking disc retainer passes through the second arc-shaped groove from the front end face and is fastened to the outer locking disc. The retainer cap of the locking disc retainer limits the inner locking disc to prevent it from disengaging.

8. The coaxial adjustment fixture for inner and outer cylinders according to claim 5, characterized in that: The outer edge of the inner locking disc is provided with ratchet teeth, which cooperate with the inner locking pawl hinged to the front end face of the outer locking disc, so that the inner locking disc can only rotate in one direction relative to the outer locking disc.

9. The coaxial adjustment fixture for inner and outer cylinders according to claim 5, characterized in that: The inner lock crank is connected to the front end of the inner lock disc, so that the inner lock disc can be rotated by the inner lock crank.

10. The coaxial adjustment fixture for inner and outer cylinders according to claim 5, characterized in that: The number of internal positioning claws is 3.

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