External embracing clamp for rod parts
By designing an external clamping fixture for rod-shaped parts, and utilizing a protective support ring for guidance and an expansion ring for clamping, the problem of uneven force distribution when a three-jaw chuck holds a piston rod was solved. This enabled precise positioning and stable machining of the piston rod, improving machining quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU WUTINGQIAO CYLINDER LINER
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-01
AI Technical Summary
When a traditional three-jaw chuck clamps a piston rod, the radial clamping force is unevenly distributed, causing local plastic deformation or ellipticization of the rod. Insufficient rigidity also leads to cutting vibration, affecting machining quality and efficiency.
Design an external clamping fixture for rod-like parts, including a mounting base, a positioning ring, an expansion ring, a clamping component, and a protective support ring. The protective support ring guides the rod to prevent collisions, and the expansion ring clamps the rod evenly on its outer periphery, achieving precise positioning and stable processing of the rod.
It effectively prevents deformation of the rods, improves processing quality and stability, ensures accurate positioning of the rods during processing, avoids excessive local stress, and improves processing accuracy and efficiency.
Smart Images
Figure CN224182566U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fixture and tooling technology, and in particular to an external clamping fixture for rod-type parts. Background Technology
[0002] The piston rod is a key transmission component in reciprocating mechanisms such as hydraulic cylinders and pneumatic cylinders. It is typically made of high-strength alloy steel or special materials, possessing high rigidity, wear resistance, and fatigue resistance. Its main body is a slender cylindrical shape, with one end connected to the piston and the other end connected to the external load via an external thread or flange structure. It undertakes core functions such as power transmission, sealing and guidance, and load support, and is widely used in engineering machinery, automated equipment, and heavy vehicles.
[0003] In the precision machining of piston rods, traditional clamping methods (such as three-jaw chucks directly clamping the outer diameter) have significant drawbacks. The radial clamping force distribution of the three-jaw chuck is uneven, which can easily cause local plastic deformation or ellipticization of the rod. When the distance between the clamping contact surface and the machining area is far, insufficient rigidity can easily cause cutting vibration, resulting in excessive runout of the outer diameter or surface ripples. Therefore, the machining method of using a three-jaw chuck to clamp the end of the piston rod severely restricts the machining quality and production efficiency of the piston rod. Utility Model Content
[0004] This application provides an external clamping fixture for rod-type parts to solve the problems caused by using a three-jaw chuck to hold piston rods.
[0005] The first aspect of this application provides an external clamping fixture for rod-like parts, comprising:
[0006] The mounting base has a connecting end at one end and a tapered hole at the other end. The connecting end is used to connect with the spindle of the machine tool, and the small end of the tapered hole faces the connecting end. The tapered hole is used to insert the rod to be processed.
[0007] A positioning ring is connected to the mounting base. The positioning ring has a positioning groove, which is used to insert and position the end of the rod.
[0008] An expansion ring is connected to the mounting base. The expansion ring has a conical end and a clamping hole. The conical end is inserted into the conical hole, and the clamping hole is used for the rod to pass through.
[0009] A clamping member, connected to the mounting base, is used to apply pressure to the expansion ring toward the tapered hole, so that the clamping hole clamps the rod;
[0010] A protective support ring is located between the positioning ring and the expansion ring. The protective support ring has a guide hole that matches the rod, and the rod is inserted into the guide hole.
[0011] The beneficial effects of the above embodiments are as follows: the external clamping fixture for rod-like parts, guided by the protective support ring, can effectively prevent the rod from colliding with the mounting base and guide the rod to move precisely, making it easy for one end of the rod to be inserted into the positioning groove, and the positioning groove to position one end of the rod. The middle part is clamped around the rod by the expansion ring. During this process, the outer circumference of the rod is evenly stressed, avoiding excessive local stress and deformation of the rod. At the same time, the fixture has a long positioning distance for the rod, and the rod is stably positioned during the processing, thereby improving the processing quality of the rod.
[0012] Based on the above embodiments, the embodiments of this application can be further improved as follows:
[0013] In one embodiment of this application: the mounting base includes: a connecting flange for connecting to the spindle; a connecting sleeve fitted onto the connecting flange, with the positioning ring connected to the connecting sleeve; and a tapered ring connected to the connecting sleeve, with the tapered hole formed in the tapered ring. The beneficial effect of this step is that by disassembling the mounting base into three parts, it facilitates the machining of the mounting base and the assembly of the overall structure.
[0014] In one embodiment of this application, it further includes: a chip-proof ring, which is connected to the conical ring and covers the expansion ring on its inner side; the clamping member is connected to the chip-proof ring. The beneficial effect of this step is that the chip-proof ring facilitates the connection of the clamping member and prevents machining waste from affecting the movement of the expansion ring.
[0015] In one embodiment of this application: the protective support ring includes: a first ring body, inserted into the connecting sleeve, the first ring body having the guide hole. The beneficial effect of this step: the first ring body guides the movement of the rod within the connecting sleeve.
[0016] In one embodiment of this application, it further includes a first stop member connected to the connecting sleeve and used to limit the first ring body. The beneficial effect of this step is that the first stop member prevents the first ring body from slipping within the connecting sleeve.
[0017] In one embodiment of this application, the protective support ring further includes a second ring body inserted into the conical ring, the second ring body having the guide hole. The beneficial effect of this step is that the second ring body guides the connecting sleeve end, thereby forming a double-guided and double-protective structure with the first ring body.
[0018] In one embodiment of this application, it further includes a second stop, connected to the cone ring, and used to limit the second ring body. The beneficial effect of this step is that the second stop prevents the second ring body from slipping within the cone ring. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0020] Figure 1 This is a schematic diagram of the external clamping device.
[0021] Figure 2 This is a schematic diagram of the expansion ring structure.
[0022] The components include: 1. Mounting base; 101. Tapered hole; 102. Connecting flange; 103. Connecting sleeve; 104. Tapered ring; 2. Positioning ring; 201. Positioning groove; 3. Expansion ring; 301. Tapered end; 302. Clamping hole; 303. Notch; 4. Protective support ring; 401. Guide hole; 402. First ring body; 403. Second ring body; 5. Rod; 6. Anti-chip ring. Detailed Implementation
[0023] In this application, unless otherwise expressly specified and limited, the terms used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. If electrical or electronic equipment is involved, it can also refer to an electrical connection or a communication signal connection, etc. For those skilled in the art, the specific meaning of different terms in this utility model can be understood according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.
[0024] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0025] Example
[0026] like Figure 1As shown, an external clamping fixture for rod-like parts includes: a mounting base 1, a positioning ring 2, an expansion ring 3, a clamping component, and a protective support ring 4. One end of the mounting base 1 is a connecting end, and the other end has a tapered hole 101. The connecting end is used to connect with the spindle of a machine tool. The small end of the tapered hole 101 faces the connecting end, and the tapered hole 101 is used to insert the rod 5 to be processed. The positioning ring 2 is connected to the mounting base 1 and has a positioning groove 201. The positioning groove 201 is used to insert and position the end of the rod 5. The expansion ring 3 is connected to the mounting base 1. The expansion ring 3 has a conical end 301 and a clamping hole 302. The conical end 301 is inserted into the conical hole 101, and the clamping hole 302 is for the rod 5 to pass through. The clamping member is connected to the mounting base 1 and is used to apply pressure to the expansion ring 3 toward the conical hole 101, so that the clamping hole 302 clamps the rod 5. The protective support ring 4 is located between the positioning ring 2 and the expansion ring 3. The protective support ring 4 has a guide hole 401 that matches the rod 5, and the rod 5 is inserted into the guide hole 401.
[0027] In some embodiments of this application, such as Figure 1 As shown, the mounting base 1 includes: a connecting flange 102, a connecting sleeve 103, and a tapered ring 104. The connecting flange 102 is used to connect with the spindle. The connecting sleeve 103 is fitted onto the connecting flange 102. The positioning ring 2 is connected to the connecting sleeve 103. The tapered ring 104 is connected to the connecting sleeve 103. The tapered hole 101 is opened in the tapered ring 104. By disassembling the mounting base 1 into three parts, it is easy to process the mounting base 1 and assemble the overall structure.
[0028] In some embodiments of this application, such as Figure 1 As shown, the connecting flange 102 is equipped with a first positioning boss, the connecting sleeve 103 is fitted onto the first positioning boss, the tapered ring 104 is equipped with a second positioning boss, the second positioning boss is inserted into the other end of the connecting sleeve 103, the connecting sleeve 103 is connected to the connecting flange 102 by bolts, and the tapered ring 104 is connected to the connecting sleeve 103 by bolts.
[0029] In some instances of this application, such as Figure 1 As shown, the external clamp also includes a chip-proof ring 6, which is connected to the conical ring 104. The chip-proof ring 6 covers the expansion ring 3 on its inner side. The clamping member is connected to the chip-proof ring 6. The chip-proof ring 6 facilitates the connection of the clamping member and prevents processing waste from adversely affecting the expansion ring 3.
[0030] In some embodiments of this application, such as Figure 1As shown, the anti-chip ring 6 has a hole corresponding to the rod 5, and the rod 5 passes through the hole. The anti-chip ring 6 has a groove at the end corresponding to the expansion ring 3, so as to avoid interference between the anti-chip ring 6 and the expansion ring 3.
[0031] In some embodiments of this application, such as Figure 1 As shown, the protective support ring 4 includes: a first ring body 402, which is inserted into the connecting sleeve 103. The first ring body 402 has the guide hole 401, which guides the rod 5 to move through the connecting sleeve 103.
[0032] In some embodiments of this application, such as Figure 1 As shown, the external clamp also includes a first stop, which is connected to the connecting sleeve 103 and is used to limit the first ring body 402, thereby preventing the first ring body 402 from sliding in the connecting sleeve 103.
[0033] In some embodiments of this application, such as Figure 1 As shown, the connecting sleeve 103 has a first threaded hole, the first ring body 402 has a first limiting groove on its outer periphery, and the first stop can be a part such as a bolt or a set screw. The first stop is threadedly connected to the first threaded hole, and the end of the first stop is inserted into the first limiting groove to fix the first ring body and prevent the first ring body 402 from sliding during the movement of the rod 5.
[0034] In some embodiments of this application, such as Figure 1 As shown, the protective support ring 4 further includes a second ring body 403, which is inserted into the conical ring 104. The second ring body 403 has the guide hole 401. The second ring body 403 guides the end of the connecting sleeve 103, thereby forming a double guide and double protection structure with the first ring body 402.
[0035] In some embodiments of this application, such as Figure 1 As shown, the external clamp also includes a second stop, which is connected to the conical ring 104 and is used to limit the second ring body 403, thereby preventing the second ring body 403 from sliding in the conical ring 104.
[0036] In some embodiments of this application, such as Figure 1 As shown, the tapered ring 104 has a limiting hole coaxial with the tapered hole 101, the second ring body 403 is inserted into the limiting hole, the tapered ring 104 also has a second threaded hole, the second stop can be a part such as a bolt or a set screw, the end of the second stop limits the other end of the second ring body 403 in the tapered ring 104.
[0037] In some embodiments of this application, such as Figure 2As shown, a notch 303 is provided on one side of the expansion ring 3, and a bolt is used as the clamping member. During the process of the bolt gradually pressing the expansion ring 3 into the tapered hole 101, the expansion ring 3 can gradually contract due to the presence of the notch 303, thus tightly hugging the rod 5.
[0038] When in use, this type of external clamping fixture for rod-like parts, guided by the protective support ring 4, effectively prevents the rod 5 from colliding with the mounting base 1 and guides the rod 5 to move precisely. This facilitates the insertion of one end of the rod 5 into the positioning groove 201, which positions one end of the rod 5. The other end is clamped around the rod 5 by the expansion ring 3. During this process, the outer circumference of the rod 5 is evenly stressed, preventing excessive local stress and deformation. Furthermore, the fixture has a long positioning distance for the rod 5, ensuring stable positioning during processing. This facilitates the machine tool's machining of the end face of the rod 5, thereby improving the processing quality of the rod.
[0039] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.
Claims
1. An external clamping fixture for rod-shaped parts, characterized in that, include: The mounting base has a connecting end at one end and a tapered hole at the other end. The connecting end is used to connect with the spindle of the machine tool, and the small end of the tapered hole faces the connecting end. The tapered hole is used to insert the rod to be processed. A positioning ring is connected to the mounting base. The positioning ring has a positioning groove, which is used to insert and position the end of the rod. An expansion ring is connected to the mounting base. The expansion ring has a conical end and a clamping hole. The conical end is inserted into the conical hole, and the clamping hole is for the rod to pass through. A clamping member, connected to the mounting base, is used to apply pressure to the expansion ring toward the tapered hole, so that the clamping hole clamps the rod; A protective support ring is located between the positioning ring and the expansion ring. The protective support ring has a guide hole that matches the rod, and the rod is inserted into the guide hole.
2. The external clamping fixture according to claim 1, characterized in that, The mounting base includes: A connecting flange for connection to the main shaft; A connecting sleeve is fitted onto the connecting flange, and the positioning ring is connected within the connecting sleeve; A tapered ring is connected to the connecting sleeve, and the tapered hole is formed in the tapered ring.
3. The embrace clamp of claim 2, wherein Also includes: A chip-proof ring is connected to the conical ring, and the chip-proof ring covers the expansion ring on its inner side. The clamping member is connected to the chip-proof ring.
4. The external clamping fixture according to claim 2, characterized in that, The protective support ring includes: The first ring is inserted into the connecting sleeve, and the first ring has the guide hole.
5. The external clamp according to claim 4, characterized in that, Also includes: The first stop is connected to the connecting sleeve and is used to limit the first ring body.
6. The external clamping fixture according to claim 4, characterized in that, The protective support ring also includes: The second ring is inserted into the conical ring, and the second ring has the guide hole.
7. The external clamping fixture according to claim 6, characterized in that, Also includes: The second stop is connected to the cone ring and is used to limit the second ring body.