Liquid expansion clamp for turning and grinding
By designing a liquid expansion fixture for car grinding, the piston and expansion medium are driven by hydraulic pressure to shrink the expansion position of its annular structure, which solves the problem that traditional fixtures are difficult to efficiently clamp large and short workpieces, and achieves high-precision and high-efficiency workpiece processing.
Patent Information
- Application Number
- CN202421781079.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-25
AI Technical Summary
Traditional double-headed truck clamps are difficult to efficiently clamp workpieces with large diameters and short lengths, resulting in low coaxiality, low machining accuracy, and low operating efficiency.
A liquid expansion fixture for car grinding is designed, and a fixture body with an annular structure is built-in piston cavity, expansion medium and oil inlet hole. The piston and expansion medium are driven by hydraulic pressure to shrink the expansion position of the fixture body, thereby achieving efficient clamping of the workpiece.
The coaxiality of the workpiece is improved, the machining accuracy is ensured, the large and short workpiece clamping needs are met, and the work efficiency and product quality are improved.
Smart Images
Figure CN222806536U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machining, in particular to a liquid expansion clamp for turning and grinding. Background Art
[0002] In machining, turning and grinding are commonly used processing methods. The workpiece is clamped by the fixture on the lathe or grinder and then the corresponding operation is performed. The traditional double-head lathe fixture uses two sets of mechanical open sleeves or viscose sleeves to clamp the two ends of the workpiece. The clamping accuracy, that is, the coaxiality, is limited. In addition, the traditional fixture cannot clamp workpieces with large diameters and short clamping lengths. For such workpieces, clamping rods need to be welded or bolted at both ends to facilitate the clamping operation, which results in low work efficiency, increased workload, and low coaxiality.
[0003] In view of the above problems, the utility model document proposes a liquid expansion clamp for turning and grinding. Utility Model Content
[0004] The utility model provides a liquid expansion clamp for turning and grinding, which improves the coaxiality of clamped workpieces, ensures the machining accuracy of the workpieces, and meets the clamping requirements of large and short workpieces.
[0005] The utility model provides the following technical solutions:
[0006] A liquid expansion clamp for lathe and grinding comprises a clamp body, the clamp body being an annular structure, one end of which is provided with an end cover, and the end face is provided with an annular piston cavity, a piston ring and a piston are provided in the piston cavity, an expansion medium is provided at the bottom of the piston cavity, at least one annular expansion cavity is provided near the inner wall of the side wall of the clamp body, the expansion cavity is communicated with the bottom of the piston cavity, an expansion medium is provided in the expansion cavity, and the inner wall of the clamp body corresponding to the expansion cavity is the expansion position; an oil inlet hole is provided on the outer side wall of the clamp body, the oil inlet hole is communicated with the contact surface between the piston cavity and the end cover; a threaded mounting hole is provided on the end cover.
[0007] Furthermore, the piston ring is fixedly connected to the piston by bolts, and the piston ring is located on a side close to the end cover, and the piston is located on a side close to the expansion medium.
[0008] Furthermore, the side wall of the piston cavity is a stepped structure, and the diameter of one end close to the end cover is larger than the diameter of the other end, the piston ring is slidably arranged on the side of the piston cavity with a larger diameter, and the piston is slidably arranged on the side of the piston cavity with a smaller diameter.
[0009] Furthermore, a limit block is provided on the end face of the piston ring adjacent to the end cover, a pressure chamber is provided between the piston ring and the end cover, a first connecting hole is opened on the side wall of the clamp body, the first connecting hole is connected to the pressure chamber, and a second connecting hole is opened on the end face of the end cover of the clamp body, the second connecting hole is connected to the oil inlet hole and the first connecting hole.
[0010] Furthermore, a sealing plug is provided at one end of the second connection hole close to the end cover, and a sealing plug is provided at one end of the first connection hole located on the outer side wall of the clamp body.
[0011] Furthermore, the end cover is connected to the fixture body by bolts, and a first sealing ring is provided at the connection.
[0012] Furthermore, a second sealing ring is embedded in the piston ring side wall and the piston side wall.
[0013] In the utility model, the clamp is installed on the machine tool chuck through the threaded mounting hole, and oil is transported to a side of the end cover adjacent to the piston ring through the oil inlet hole. The oil pressure acts on the end face of the piston ring to push the piston ring to move in the piston cavity, thereby driving the piston to move. The piston moves and squeezes the expansion medium in the piston cavity. Since the piston cavity is connected to the expansion cavity, the expansion medium in the expansion cavity is acted on, so that the expansion medium squeezes the inner wall of the clamp body, causing the inner wall of the clamp body corresponding to the position of the expansion cavity to shrink, thereby clamping the workpiece. The size of the clamp body can be selected according to the size of the workpiece to meet the clamping requirements of workpieces of different sizes, while ensuring the coaxiality of the clamping position and the machining accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A schematic diagram of the main structure of a liquid expansion clamp for lathe and grinding provided by an embodiment of the utility model;
[0015] Figure 2 for Figure 1 AA section view.
[0016] Reference numerals:
[0017] 1. End cover; 2. Oil inlet hole; 3. Threaded mounting hole; 4. Clamp body; 5. Piston chamber; 6. Piston ring; 7. Piston; 8. Expansion medium; 9. Pressure chamber; 10. Second connecting hole; 11. First connecting hole; 12. Sealing plug; 13. Second sealing ring; 14. Expansion chamber; 15. First sealing ring. DETAILED DESCRIPTION
[0018] The embodiments of the present invention are described below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0019] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection" and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "connection" can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed" means that they are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present utility model, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model.
[0020] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.
[0021] In the embodiment of the present invention, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0022] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the utility model include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0023] Embodiment 1:
[0024] Reference Figure 1 and Figure 2As shown, a liquid expansion clamp for lathe and grinding includes a clamp body 4, which is an annular structure and has an end cover 1 at one end. The end face is provided with an annular piston cavity 5, in which a piston ring 6 and a piston 7 are provided, and an expansion medium 8 is provided at the bottom of the piston cavity 5. An annular expansion cavity 14 is provided near the inner wall of the side wall of the clamp body 4, and the expansion cavity 14 is connected to the bottom of the piston cavity 5. The expansion medium 8 is arranged in the expansion cavity 14, and the inner wall of the clamp body 4 corresponding to the expansion cavity 14 is the expansion position; the outer wall of the clamp body 4 is provided with an oil inlet hole 2, and the oil inlet hole 2 is connected to the contact surface between the piston cavity 5 and the end cover 1; the end cover 1 is provided with a threaded mounting hole 3.
[0025] The piston chamber 5 is closed by the end cover 1, so that the oil flowing in from the oil inlet hole 2 flows between the piston ring 6 and the end cover 1, and the oil pressure generated can squeeze the piston ring 6, thereby pushing the piston ring 6 to move, and the bottom of the piston chamber 5 is connected with the expansion chamber 14, and the expansion medium 8 at the bottom of the piston chamber 5 contacts the expansion medium 8 in the expansion chamber 14. The piston 7 moves to squeeze the expansion medium 8 at the bottom of the piston chamber 5, so that the expansion medium 8 at the bottom of the piston chamber 5 is squeezed against the expansion chamber 14, and then the expansion medium 8 in the expansion chamber 14 is squeezed. After being squeezed, the expansion medium 8 in the expansion chamber 14 squeezes the expansion position of the inner side wall of the clamp body 4 corresponding to the expansion chamber 14, so that the expansion position of the clamp body 4 shrinks toward the middle of the clamp body 4, and the workpiece placed inside the clamp body 4 can be clamped.
[0026] The piston ring 6 is fixedly connected to the piston 7 by bolts, and the piston ring 6 is located on a side close to the end cover 1 , and the piston 7 is located on a side close to the expansion medium 8 .
[0027] The piston ring 6 is connected to the piston 7, so that when the piston ring 6 is moved by the oil pressure, it can drive the piston 7 to move, and after the oil pressure disappears, the piston 7 moves under the action of the expansion medium 8, and can also push the piston ring 6 to move together. The piston ring 6 is located on the side close to the end cover 1, so that the oil pressure can act on the end face of the piston ring 6, and the piston 7 is located on the side close to the expansion medium 8, so that the piston 7 can push the expansion medium 8.
[0028] The side wall of the piston chamber 5 is a stepped structure, and the diameter of one end close to the end cover 1 is larger than the diameter of the other end. The piston ring 6 is slidably arranged on the side of the piston chamber 5 with a larger diameter, and the piston 7 is slidably arranged on the side of the piston chamber 5 with a smaller diameter.
[0029] The piston chamber 5 is stepped, so that the piston ring 6 will abut against the side wall of the piston chamber 5 after moving to a certain distance, thereby limiting the movement distance of the piston ring 6, and then limiting the movement distance of the piston 7, and then limiting the force of the piston 7 on the expansion medium 8, to prevent excessive oil pressure from causing the piston 7 to exert excessive force on the expansion medium 8, and the expansion medium 8 from exerting excessive force on the inner wall of the clamp body 4, causing damage to the side wall of the clamp body 4, thereby causing damage to the clamp.
[0030] A limit block is provided on the end face of the piston ring 6 adjacent to the end cover 1, a pressure chamber 9 is provided between the piston ring 6 and the end cover 1, a first connecting hole 11 is opened on the side wall of the clamp body 4, the first connecting hole 11 is connected to the pressure chamber 9, a second connecting hole 10 is opened on the end face of the end cover 1 of the clamp body 4, the second connecting hole 10 is connected to the oil inlet hole 2 and the first connecting hole 11.
[0031] The oil inlet hole 2 is connected to the pressure chamber 9 through the first connecting hole 11 and the second connecting hole 10, and the oil is input from the oil inlet hole 2 into the pressure chamber 9, and acts on the piston ring 6 through the pressure chamber 9, thereby pushing the piston ring 6 to move. Since the oil inlet hole 2 is connected to the pressure chamber 9 inside the clamp body 4, processing is convenient through the first connecting hole 11 and the second connecting hole 10.
[0032] A sealing plug 12 is disposed at one end of the second connection hole 10 close to the end cover 1 , and a sealing plug 12 is disposed at one end of the first connection hole 11 located at the outer side wall of the clamp body 4 .
[0033] The opening end of the second connecting hole 10 and the opening end of the first connecting hole 11 are sealed by the sealing plug 12, which facilitates processing on the one hand, and prevents oil from leaking from the opening of the first connecting hole 11 or the opening of the second connecting hole 10 after processing on the other hand.
[0034] The end cover 1 is connected to the fixture body 4 by bolts, and a first sealing ring 15 is provided at the connection.
[0035] The first sealing ring 15 is used to improve the sealing of the connection between the end cover 1 and the furniture body, thereby improving the sealing of the pressure chamber 9, preventing oil from leaking from the connection and failing to apply pressure to the piston ring 6, thereby failing to push the piston ring 6 to move, resulting in the fixture being unable to clamp the workpiece.
[0036] Second sealing rings 13 are embedded in the side walls of the piston ring 6 and the piston 7 .
[0037] The second sealing ring 13 is used to improve the sealing between the piston ring 6 and the inner wall of the piston chamber 5, thereby preventing oil from flowing into the bottom of the piston chamber 5, causing the piston 7 to be subjected to oil pressure, thereby balancing the oil pressure on the piston ring 6, making the piston ring 6 unable to move, resulting in the fixture being unable to clamp the workpiece.
[0038] When in use, after selecting a suitable clamp body 4 according to the size of the workpiece, first seal the openings of the first connecting hole 11 and the second connecting hole 10 with the sealing plug 12, and install the clamp on the chuck of the machine tool through the threaded mounting hole 3 with the bolts, connect the oil source at the oil inlet hole 2, select a suitable clamp body 4 according to the size of the workpiece, input the oil from the oil inlet hole 2, and reach the pressure chamber 9 after passing through the second connecting hole 10 and the first connecting hole 11. As the oil pressure in the pressure chamber 9 increases, the oil pressure pushes the piston ring 6 to move, and then pushes the piston 7 to move toward the expansion medium 8 at the bottom of the piston chamber 5, and the piston 7 squeezes the expansion medium 8 The expansion medium 8 at the bottom of the piston cavity 5 is squeezed and then squeezes the expansion medium 8 in the expansion cavity 14. The expansion medium 8 in the expansion cavity 14 is squeezed and then squeezes the side wall of the expansion cavity 14. Since one side wall of the expansion cavity 14 is adjacent to the expansion position of the inner wall of the clamp body 4, the expansion position will shrink toward the middle part of the annular clamp body 4 after being squeezed, thereby clamping and fixing the workpiece placed inside the clamp body 4. After the processing is completed, the oil supply at the oil inlet hole 2 is closed, and the contraction of the expansion medium 8 will push the piston 7 to move toward the end cover 1, and the inner wall of the clamp body 4 returns to its initial state. The workpiece is released and can be removed.
[0039] In actual use, the sealing plug 12 is fixed to the clamp body 4 by welding to prevent the sealing plug 12 from being pressed out by oil pressure and affecting the normal use of the clamp.
[0040] In actual use, two fixtures are set on the machine tool to ensure the clamping accuracy and high coaxiality of both ends of the workpiece.
[0041] Embodiment 2:
[0042] A liquid expansion clamp for lathe and grinding comprises a clamp body 4, which is an annular structure and has an end cover 1 at one end. An annular piston cavity 5 is opened on the end face. A piston ring 6 and a piston 7 are arranged in the piston cavity 5. An expansion medium 8 is arranged at the bottom of the piston cavity 5. Two annular expansion cavities 14 are arranged near the inner wall of the side wall of the clamp body 4. The expansion cavity 14 is connected to the bottom of the piston cavity 5. The expansion medium 8 is arranged in the expansion cavity 14. The inner wall of the clamp body 4 corresponding to the expansion cavity 14 is the expansion position; an oil inlet hole 2 is arranged on the outer wall of the clamp body 4, and the oil inlet hole 2 is connected to the contact surface between the piston cavity 5 and the end cover 1; a threaded mounting hole 3 is arranged on the end cover 1.
[0043] By providing two expansion chambers 14, the workpiece can be clamped more firmly, and the stability of the workpiece during the processing is further improved.
[0044] The clamp of the utility model can select a suitable clamp body 4 according to the size and thickness of the workpiece, has strong adaptability, is simple to operate during clamping, is stable during clamping, and has high coaxiality at both ends of the workpiece during clamping, thereby ensuring processing accuracy and improving product quality.
[0045] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited to them. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model; in the absence of conflicts, the embodiments of the utility model and the features in the embodiments can be combined with each other. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.
Claims
1. A liquid expansion fixture for turning and grinding, characterized in that: It includes a clamp body, which is an annular structure and has an end cover at one end. The end face is provided with an annular piston cavity, a piston ring and a piston are provided in the piston cavity, an expansion medium is provided at the bottom of the piston cavity, at least one annular expansion cavity is provided near the inner wall of the side wall of the clamp body, the expansion cavity is communicated with the bottom of the piston cavity, an expansion medium is provided in the expansion cavity, and the inner wall of the clamp body corresponding to the expansion cavity is the expansion position; an oil inlet hole is provided on the outer wall of the clamp body, and the oil inlet hole is communicated with the contact surface between the piston cavity and the end cover; a threaded mounting hole is provided on the end cover.
2. A liquid expansion fixture for lathe and grinding according to claim 1, characterized in that: The piston ring is fixedly connected to the piston by bolts, and the piston ring is located on a side close to the end cover, and the piston is located on a side close to the expansion medium.
3. A liquid expansion fixture for lathe and grinding according to claim 2, characterized in that: The side wall of the piston cavity is a stepped structure, and the diameter of one end close to the end cover is larger than the diameter of the other end. The piston ring is slidably arranged on the side with a larger diameter of the piston cavity, and the piston is slidably arranged on the side with a smaller diameter of the piston cavity.
4. The liquid expansion fixture for lathe and grinding according to claim 3, characterized in that: A limit block is provided on the end face of the piston ring adjacent to the end cover, a pressure chamber is provided between the piston ring and the end cover, a first connecting hole is opened on the side wall of the clamp body, the first connecting hole is connected to the pressure chamber, and a second connecting hole is opened on the end face of the clamp body provided with the end cover, the second connecting hole is connected to the oil inlet hole and the first connecting hole.
5. The liquid expansion fixture for lathe and grinding according to claim 4, characterized in that: A sealing plug is provided at one end of the second connection hole close to the end cover, and a sealing plug is provided at one end of the first connection hole located on the outer side wall of the clamp body.
6. The liquid expansion fixture for lathe and grinding according to claim 5, characterized in that: The end cover is connected to the clamp body through bolts, and a first sealing ring is provided at the connection.
7. The liquid expansion fixture for lathe and grinding according to claim 6, characterized in that: The piston ring side wall and the piston side wall are both embedded with a second sealing ring.