Shaft fixing clamp for CNC machine tool
By designing the sliding sleeve, rotating sleeve, connecting rod, clamping block, and piston ring, the problem of seal wear in CNC machine tool shaft fixing fixtures at high speeds was solved, achieving stable clamping and reducing maintenance costs.
Patent Information
- Application Number
- CN202520021659.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-06
AI Technical Summary
Existing CNC machine tool shaft fixing fixtures are prone to seal wear at high speeds, leading to air or liquid leakage, affecting clamping stability and resulting in high maintenance costs.
The design employs a sliding sleeve, rotating sleeve, connecting rod, clamping block, and piston ring. The movement of the sliding sleeve is controlled by a pneumatic or hydraulic system, enabling the clamping block to move inward and outward for clamping. The hollow structure and guide protrusions prevent the sliding sleeve from rotating and reduce seal wear.
It improves clamping stability and flexibility, extends seal life, and reduces maintenance costs.
Smart Images
Figure CN223762182U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machine tool accessories technology, specifically a shaft fixing fixture for CNC machine tools. Background Technology
[0002] CNC machine tools, also known as numerical control machine tools, only require the operator to accurately place the workpiece inside the machine tool and perform preparation work such as tool setting. After that, the machine tool can be automatically controlled by the program to turn the workpiece into shape. This solves the problem of machining complex, precise, small-batch, and multi-variety parts. During the machining process, CNC machine tools need to use various fixtures to hold the workpiece to avoid workpiece displacement during the machining process, which would affect the machining accuracy.
[0003] Existing CNC machine tool shaft clamping fixtures are usually three-jaw chucks. Due to their relatively cumbersome operation, they are gradually being automated by adopting pneumatic or hydraulic drive methods for automatic clamping. However, this automatic clamping method requires a rotary structure to prevent the pipeline from rotating with the three-jaw chuck. The rotary structure also needs to have a seal between it and the chuck. During operation, the chuck usually rotates at thousands or tens of thousands of revolutions per minute, and the machining is usually done in hours. This makes the seals easily wear down, affecting their service life and causing air or liquid leakage. This affects the stability of clamping, and frequent seal replacement leads to high maintenance costs. Utility Model Content
[0004] Therefore, the purpose of this utility model is to provide a shaft fixing fixture for CNC machine tools to solve the technical problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a shaft fixing fixture for CNC machine tools, including a bracket, the bracket having a cavity inside, and connecting pipes on both sides of the top of the bracket, a sliding sleeve passing through both sides of the bracket, and a piston ring and a rotating sleeve respectively sleeved on the outside of the sliding sleeve, a turntable passing through both ends of the sliding sleeve, and a guide groove opening on one side of the turntable, a clamping block connected inside the guide groove, and a connecting rod connecting the clamping block and the rotating sleeve.
[0006] By adopting the above technical solution, the operator activates the pneumatic or hydraulic system, allowing compressed air or hydraulic oil to be injected into the two connecting pipes to the two sides of the cavity respectively. The piston rings separate the two sides of the cavity to prevent them from connecting. When fluid is injected into the left side of the cavity, the sliding sleeve is forced to the right, and the sliding sleeve pulls the four connecting rods, causing the four clamping blocks to move towards the center of the turntable. Conversely, when fluid is injected into the right side of the cavity, the sliding sleeve is forced to the left, and the sliding sleeve pushes the four connecting rods, causing the four clamping blocks to move towards the outer ring of the turntable. The clamping blocks are guided by guide grooves as they move, thus facilitating the clamping of the workpiece. After clamping, the operator starts the machine tool spindle to rotate the turntable. The rotation of the turntable drives the clamping blocks to rotate, thereby causing the workpiece to rotate. When the turntable rotates, the presence of the rotating sleeve ensures that the rotation of the clamping blocks and connecting rods only drives the rotating sleeve to rotate. Furthermore, the four protrusions on one side of the outer surface, one side of the back, one side of the top, and one side of the sliding sleeve cooperate to guide the sliding sleeve, thus preventing the sliding sleeve from rotating with the turntable.
[0007] Furthermore, the sliding sleeve has protrusions on one side of its outer surface, one side of its back, one side of its top, and one side of its bottom, and the sliding sleeve is slidably connected to the bracket, and the piston ring is slidably connected to the cavity.
[0008] By adopting the above technical solution, the four protrusions on one side of the outer surface of the slide sleeve, one side of the back, one side of the top, and one side of the bottom cooperate to guide the slide sleeve, thereby preventing the slide sleeve from rotating along with the rotating sleeve and the turntable.
[0009] Furthermore, the two connecting pipes are located on the upper sides of the piston ring, and both connecting pipes are connected to the cavity.
[0010] By adopting the above technical solution, the two connecting pipes respectively input compressed air or hydraulic oil into both sides of the cavity, and the piston rings separate the two sides of the cavity to prevent them from connecting.
[0011] Furthermore, one end of the connecting rod is rotatably connected to the rotating sleeve, and the other end of the connecting rod is rotatably connected to the clamping block.
[0012] By adopting the above technical solution, when fluid is injected into the left side of the cavity, the sliding sleeve is forced to the right and moves to the right. After the sliding sleeve moves to the right, it pulls the four connecting rods, causing the four clamping blocks to move towards the center of the turntable. Conversely, when fluid is injected into the right side of the cavity, the sliding sleeve is forced to the left and moves to the left. After the sliding sleeve moves to the left, it pushes the four connecting rods, causing the four clamping blocks to move towards the outer ring of the turntable.
[0013] Furthermore, one side of the clamping block is stepped, and the clamping block is slidably connected to the turntable through a guide groove.
[0014] By adopting the above technical solution, one side of the clamping block is stepped, which allows the clamping block to clamp the workpiece not only when it moves towards the center of the turntable, but also when it moves towards the outer ring of the turntable. The internal and external clamping increases the flexibility so as to clamp workpieces of more sizes.
[0015] Furthermore, the cross-section of the other side of the clamping block is T-shaped, and the cross-section of the guide groove is cross-shaped.
[0016] By adopting the above technical solution, the shape of the other side of the clamping block, combined with the shape of the guide groove, can effectively support and guide the clamping block. The cross-shaped guide groove also facilitates the passage of the connecting rod.
[0017] Furthermore, both the rotating sleeve and the turntable are rotatably connected to the sliding sleeve.
[0018] By adopting the above technical solution, the rotation of the turntable drives the clamping block to rotate, thereby driving the workpiece to rotate. When the turntable rotates, due to the presence of the rotating sleeve, the rotation of the clamping block and the connecting rod will only drive the rotating sleeve to rotate.
[0019] Furthermore, there are four connecting rods, clamping blocks, and guide grooves, and the four connecting rods, clamping blocks, and guide grooves are arranged in a circular array.
[0020] By adopting the above technical solution, and by setting four connecting rods, clamping blocks and guide grooves, it is possible to clamp and limit the four points of the shaft workpiece, thereby increasing the clamping area and improving the clamping stability.
[0021] Furthermore, a support roller is connected to one side of the top of the bracket, and the support roller is in contact with the turntable.
[0022] By adopting the above technical solution, the turntable is supported by rollers during rotation, which avoids the phenomenon of swaying or vibration that may occur when the turntable is large due to its large span, thus improving the structural stability.
[0023] Furthermore, there are two idlers, and the two idlers are symmetrically distributed.
[0024] By adopting the above technical solution and setting two support rollers, the bottom of the turntable can be fully supported, and the support rollers can rotate to reduce wear.
[0025] In summary, the present invention has the following main advantages:
[0026] 1. This utility model, through the arrangement of a sliding sleeve, rotating sleeve, connecting rod, clamping block, cavity, and piston ring, allows compressed air or hydraulic oil to be input to both sides of the cavity via two connecting pipes, and the piston ring isolates the two sides of the cavity to prevent communication. When fluid is injected into the left side of the cavity, the sliding sleeve is forced to the right, and the sliding sleeve pulls the connecting rod, causing the clamping block to move towards the center of the turntable. Conversely, when fluid is injected into the right side of the cavity, the sliding sleeve is forced to the left, and the sliding sleeve pushes the connecting rod, causing the clamping block to move towards the outer ring of the turntable. This facilitates the clamping of workpieces. Furthermore, the sliding sleeve, rotating sleeve, and turntable are all hollow structures, making it easy to pass through long workpieces, thus facilitating the clamping of longer workpieces.
[0027] 2. This utility model, through the design of the sliding sleeve, ensures that the rotation of the clamping block and connecting rod only drives the sliding sleeve to rotate when the turntable rotates. Furthermore, the four protrusions on one side of the outer surface, one side of the back, one side of the top, and one side of the sliding sleeve work together to guide the sliding sleeve, thus preventing it from rotating with the turntable and the rotating sleeve. This allows the piston ring to move horizontally only with the sliding sleeve, meaning the piston ring only moves twice during installation and disassembly. Compared to traditional technologies using the same materials, this significantly reduces wear and effectively extends the service life of the seal.
[0028] 3. This utility model, through the setting of clamping blocks and guide grooves, has a stepped shape on one side of the clamping block, which allows the clamping block to clamp the workpiece not only when it moves towards the center of the turntable, but also when it moves towards the outer ring of the turntable. The internal and external clamping increases the flexibility to clamp workpieces of more sizes. The shape of the other side of the clamping block, combined with the shape of the guide groove, can effectively support and guide the clamping block, thereby improving the structural stability. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the structure of this utility model;
[0030] Figure 2 This is a cross-sectional structural diagram of the present invention during clamping;
[0031] Figure 3 This is a schematic cross-sectional view of the present invention when it is opened;
[0032] Figure 4 This is a schematic diagram of the side structure of the sliding sleeve of this utility model;
[0033] Figure 5 This is a schematic diagram of the explosion structure of the sliding sleeve of this utility model.
[0034] In the diagram: 1. Support; 2. Sliding sleeve; 3. Rotating sleeve; 4. Connecting rod; 5. Clamping block; 6. Turntable; 7. Guide groove; 8. Cavity; 9. Connecting pipe; 10. Piston ring; 11. Idler roller. Detailed Implementation
[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0036] The embodiments of this utility model will be described below based on its overall structure.
[0037] Example 1:
[0038] A shaft fixing fixture for CNC machine tools, such as Figures 1-5 As shown, the device includes a support 1 with a cavity 8 inside. Two connecting pipes 9 are located on both sides of the top of the support 1, and both connecting pipes 9 are connected to the cavity 8. Sliding sleeves 2 extend through both sides of the support 1. Protrusions are provided on one side of the outer surface, one side of the back, one side of the top, and one side of the bottom of the sliding sleeves 2. The sliding sleeves 2 are slidably connected to the support 1. A piston ring 10 and a rotating sleeve 3 are respectively fitted onto the outside of the sliding sleeves 2. The piston ring 10 is slidably connected to the cavity 8. The two connecting pipes 9 are located on both sides above the piston ring 10. The rotating sleeve 3 and the turntable... All 6 are rotatably connected to the sliding sleeve 2. Turntables 6 pass through both ends of the sliding sleeve 2. A guide groove 7 is provided on one side of the turntable 6. A clamping block 5 is connected inside the guide groove 7. The clamping block 5 is slidably connected to the turntable 6 through the guide groove 7. A connecting rod 4 connects the clamping block 5 and the rotating sleeve 3. One end of the connecting rod 4 is rotatably connected to the rotating sleeve 3, and the other end is rotatably connected to the clamping block 5. There are four connecting rods 4, four clamping blocks 5, and four guide grooves 7, arranged in a circular array. The operator activates the pneumatic or hydraulic system to... Two connecting pipes 9 respectively supply compressed air or hydraulic oil to both sides of the cavity 8, and the piston ring 10 separates the two sides of the cavity 8 to prevent them from communicating. When fluid is injected into the left side of the cavity 8, the sliding sleeve 2 is forced to the right, and after the sliding sleeve 2 moves to the right, it pulls the four connecting rods 4, causing the four clamping blocks 5 to move towards the center of the turntable 6. Conversely, when fluid is injected into the right side of the cavity 8, the sliding sleeve 2 is forced to the left, and after the sliding sleeve 2 moves to the left, it pushes the four connecting rods 4, causing the four clamping blocks 5 to move towards the outer ring of the turntable 6. As the clamping blocks 5 move, The guide groove 7 provides guidance, facilitating workpiece clamping. After clamping, the operator starts the machine tool spindle to rotate the turntable 6. The rotation of the turntable 6 drives the clamping block 5 to rotate, thereby driving the workpiece to rotate. When the turntable 6 rotates, due to the presence of the rotating sleeve 3, the rotation of the clamping block 5 and the connecting rod 4 will only drive the rotating sleeve 3 to rotate. Furthermore, the four protrusions on one side of the outer surface, one side of the back, one side of the top, and one side of the bottom of the sliding sleeve 2 cooperate to guide the sliding sleeve 2, thereby preventing the sliding sleeve 2 from rotating along with the rotating sleeve 3 and the turntable 6.
[0039] Example 2:
[0040] Based on the above embodiment one, in order to increase the stability and flexibility of clamping, the following settings are now implemented.
[0041] See Figures 1-5 In the above embodiment, one side of the clamping block 5 is stepped, and the cross section of the other side of the clamping block 5 is "T" shaped. The cross section of the guide groove 7 is "+" shaped. The step-shaped shape of one side of the clamping block 5 allows the clamping block 5 to clamp the workpiece not only when it moves towards the center of the turntable 6, but also when it moves towards the outer ring of the turntable 6. The internal and external clamping increases the flexibility to clamp workpieces of more sizes. The shape of the other side of the clamping block 5, combined with the shape of the guide groove 7, can effectively support and guide the clamping block 5. The cross shape of the guide groove 7 also facilitates the passage of the connecting rod 4.
[0042] Example 3:
[0043] Based on the above embodiment one, the following settings are now adopted to increase the stability of the structure.
[0044] See Figures 1-3 In the above embodiment, a support roller 11 is connected to one side of the top of the bracket 1. The support roller 11 is in contact with the turntable 6. There are two support rollers 11, which are symmetrically distributed. The turntable 6 is supported by the support rollers 11 during rotation, thereby improving the structural stability.
[0045] The implementation principle of this utility model is as follows: First, the operator fixes the bracket 1 inside the CNC machine tool with bolts, and connects the end of the turntable 6 away from the clamping block 5 to the spindle. The method of connecting to the spindle is the same as the traditional method of connecting the three-jaw chuck to the spindle, which is a common means in the prior art. This technical solution will not be described in detail here. Then, the operator connects the two connecting pipes 9 to the pneumatic system or hydraulic system through pipelines and connectors.
[0046] The worker places the workpiece in the area between the four clamping blocks 5. If the workpiece is long, the sliding sleeve 2, rotating sleeve 3 and turntable 6 are all hollow structures, which allows the long workpiece to pass directly through the turntable 6 for clamping, thus improving the stability of clamping.
[0047] Afterwards, the operator activates the pneumatic or hydraulic system, allowing compressed air or hydraulic oil to be injected into the two connecting pipes 9 into the two sides of the cavity 8 respectively. The piston ring 10 separates the two sides of the cavity 8 to prevent them from connecting. When fluid is injected into the left side of the cavity 8, the sliding sleeve 2 is forced to move to the right. After the sliding sleeve 2 moves to the right, it pulls the four connecting rods 4, causing the four clamping blocks 5 to move towards the center of the turntable 6. Conversely, when fluid is injected into the right side of the cavity 8, the sliding sleeve 2 is forced to move to the left. After the sliding sleeve 2 moves to the left, it pushes the four connecting rods 4, causing the four clamping blocks 5 to move towards the outer ring of the turntable 6. The clamping blocks 5 are guided by the guide groove 7 as they move, thus facilitating the clamping of the workpiece.
[0048] After clamping, the operator starts the machine tool spindle to rotate the turntable 6. The rotation of the turntable 6 drives the clamping block 5 to rotate, thereby driving the workpiece to rotate. When the turntable 6 rotates, due to the presence of the rotating sleeve 3, the rotation of the clamping block 5 and the connecting rod 4 will only drive the rotating sleeve 3 to rotate. In addition, the four protrusions on one side of the outer surface, the back side, the top side and the bottom side of the sliding sleeve 2 cooperate to guide the sliding sleeve 2, thereby preventing the sliding sleeve 2 from rotating with the rotating sleeve 3 and the turntable 6. Furthermore, the turntable 6 is supported by the roller 11 during rotation, which improves the structural stability.
[0049] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.
Claims
1. A shaft fixing clamp for CNC machine tools, comprising a support (1), characterized in that: The bracket (1) has a cavity (8) inside, and a connecting pipe (9) is provided on both sides of the top of the bracket (1). A sliding sleeve (2) passes through both sides of the bracket (1), and a piston ring (10) and a rotating sleeve (3) are respectively sleeved on the outside of the sliding sleeve (2). A turntable (6) passes through both ends of the sliding sleeve (2), and a guide groove (7) is provided on one side of the turntable (6). A clamping block (5) is connected inside the guide groove (7), and a connecting rod (4) is connected between the clamping block (5) and the rotating sleeve (3).
2. The CNC machine tool shaft fixture clamp according to claim 1, wherein: The sliding sleeve (2) has protrusions on one side of its outer surface, one side of its back, one side of its top, and one side of its bottom. The sliding sleeve (2) is slidably connected to the bracket (1), and the piston ring (10) is slidably connected to the cavity (8).
3. The shaft fixture for a CNC machine according to claim 2, characterized in that: The two connecting pipes (9) are located on the upper sides of the piston ring (10), and both connecting pipes (9) are connected to the cavity (8).
4. The CNC machine tool shaft fixture clamp of claim 1, wherein: One end of the connecting rod (4) is rotatably connected to the rotating sleeve (3), and the other end of the connecting rod (4) is rotatably connected to the clamping block (5).
5. The CNC machine tool shaft fixture clamp of claim 4, wherein: The clamping block (5) has a stepped shape on one side, and the clamping block (5) is slidably connected to the turntable (6) through the guide groove (7).
6. The CNC machine tool shaft fixture clamp of claim 5, wherein: The other side of the clamping block (5) has a "T" shaped cross section, and the guide groove (7) has a "+" shaped cross section.
7. The CNC machine tool shaft fixture clamp of claim 4, wherein: Both the rotating sleeve (3) and the turntable (6) are rotatably connected to the sliding sleeve (2).
8. The CNC machine tool shaft fixture clamp of claim 6, wherein: There are four of each of the connecting rods (4), clamping blocks (5) and guide grooves (7), and the four connecting rods (4), clamping blocks (5) and guide grooves (7) are arranged in a ring array.
9. The CNC machine tool shaft fixture clamp of claim 1, wherein: The bracket (1) has a roller (11) connected to one side of its top, and the roller (11) is in contact with the turntable (6).
10. The CNC machine tool shaft fixture clamp of claim 9, wherein: There are two idlers (11), and the two idlers (11) are symmetrically distributed.