Split type embracing type self-centering center frame

By designing a split-type self-centering center frame and using a clamping mechanism of a butterfly spring and cylinder system, the problems of lever hinged center frame processing deformation and a long cycle of an integrated center frame are solved, and high-precision and low-cost workpiece processing are achieved.

CN223277554UActive Publication Date: 2025-08-29NORTHWEST IND GRP CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422452335.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-11
Publication Date
2025-08-29
Estimated Expiration
2034-10-11

AI Technical Summary

Technical Problem

The existing lever hinged center frame is prone to deformation of the workpiece and low accuracy during processing, and the integrated hold-type center frame is long and does not have universality.

Method used

A split-type self-centering center frame is designed, including a base mechanism, frame mechanism, clamping mechanism and power control mechanism. The butterfly spring and cylinder system are used to achieve adjustable clamping of the workpiece. The clamping force is controlled by adjusting the number of pieces of the butterfly spring and cylinder pressure value, and the clamping force is achieved by combining the pneumatic valve and the fork to achieve clamping of the workpiece.

Benefits of technology

It improves the processing quality and accuracy of the workpiece, prevents processing deformation, is simple to operate, reduces the influencing factors of replacing the frame, shortens the processing cycle and reduces the cost of consumables.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223277554U_ABST
    Figure CN223277554U_ABST
Patent Text Reader

Abstract

The utility model belongs to the technical field of manufacturing and machining, and particularly relates to a split type embracing type self-centering center frame. The split type embracing type self-centering center frame comprises a base mechanism and a frame body mechanism. The frame body mechanism comprises a frame body, a clamping mechanism and a power control mechanism; the base mechanism is located at the bottom of the center frame and serves as a center frame supporting mechanism. The frame body is fixed to the upper portion of the base mechanism, the clamping mechanism is fixed to the upper portion of the frame body, and the clamping mechanism comprises a belleville spring, an adjusting nut, a sleeve, a round nut, a rear end cover, a front end cover, a bearing and an elastic clamping pipe. The power control mechanism comprises an air cylinder, a shifting fork and a pneumatic valve. Compared with a traditional center frame, the novel center frame can change the clamping force on a workpiece during machining by adjusting the number of the belleville springs and the air pressure value of the air cylinder, machining deformation is prevented, and therefore the machining quality of the workpiece is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model belongs to the technical field of manufacturing and processing, and particularly relates to a split-type holding type self-centering center frame. Background Art

[0002] The center rest is generally used for turning slender shafts with poor rigidity or workpieces with a large diameter that cannot be inserted into the spindle hole, high requirements for external circle coaxiality, and long length.

[0003] At present, the center frames used in machine tools are all lever hinge type center frames, such as Figure 1 As shown, it is mainly composed of a frame, contacts, set screws, a top cover, nuts, adjusting screws, a pressure plate, etc. The frame 1 and the pressure plate 8 are fixed to the guide rails of the machine tool by nuts 7. The top cover 4 and the frame are movably connected by pins on one side and fixed by nuts 5 on the other side. When processing parts of different specifications, first open the top cover, put in the standard parts, buckle the top cover, adjust the position of the contact 2 by adjusting the adjustment screw 6, and after confirming, tighten the set screw 3 to fix the contact, and then put the workpiece in order for processing. Practice has shown that when using a traditional center frame, since there are only three points of contact, a slightly larger clamping force will cause the thin-walled shell to deform, resulting in low precision of the processed parts. At the same time, this type of center frame is prone to wear of the workpiece during use, and the coaxiality accuracy of the parts is not high.

[0004] The clamping center stand adopts a clamping tube structure, which can clamp the entire outer diameter of the workpiece at the clamping point, and the workpiece rotates simultaneously with the clamping tube. This structure can protect the parts while ensuring the coaxiality accuracy of the parts. However, the integrated clamping center stand has high processing precision requirements and a long processing cycle.

[0005] Therefore, it remains to be developed a split-type holding type self-centering center frame to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to design and manufacture a holding type center frame according to the processing characteristics of the lever hinge type center frame, and to enable the holding type center frame to be applied to a variety of products, thereby improving versatility.

[0007] The technical solutions adopted in this utility model are as follows:

[0008] A split-type, self-centering center frame comprises a base mechanism and a frame mechanism; the frame mechanism comprises a frame 9, a clamping mechanism and a power control mechanism;

[0009] The base mechanism is located at the bottom of the center frame and serves as a support mechanism for the center frame; the frame body 9 is fixed above the base mechanism;

[0010] The clamping mechanism is fixed above the frame body 9, and the clamping mechanism includes a butterfly spring 10, an adjusting nut 11, a sleeve 13, a round nut 14, a rear end cover 16, a front end cover 19, a bearing 20 and an elastic clamping tube 21; the elastic clamping tube 21 is a trumpet-shaped shell, and one side of the large mouth end is evenly divided into several petals along the circumferential mouth, and there is a gap between each petal. The inner diameter size of the large mouth end when tightened is equivalent to the outer diameter size of the part; the sleeve 13 is a trumpet-shaped shell sleeved on the outer side of the large mouth end of the elastic clamping tube 21, and the outer end surface of the elastic clamping tube 21 and the inner end surface of the sleeve 13 cooperate to achieve clamping of the workpiece under the action of external force; the butterfly spring 10 is placed near the small mouth end of the elastic clamping tube 21, and the adjusting nut 11 is installed on the outside of the small mouth end and connected to the other end of the butterfly spring 10; the sleeve 13 and the bearing 20 are fixed together by the round nut 14, and the bearing 20 is located above the sleeve 13; the bearing 20 is fixed on the frame body 9;

[0011] The power control mechanism includes a cylinder 17, a shift fork 12 and a pneumatic valve 18; the pneumatic valve 18 is connected to the cylinder 17; the shift fork 12 is Y-shaped, and the rod-shaped rear end of the shift fork 12 is connected to the cylinder 17 installed on the side of the frame 9, and the middle of the shift fork 12 is supported by a support 15; the fork-shaped opening at the front end of the shift fork 12 contacts the adjusting nut 11, so that the shift fork 12 forms a lever. Under the adjustment of the pneumatic valve 18, the front end of the shift fork 12 reciprocates to achieve clamping of the workpiece.

[0012] Preferably, the base mechanism includes a pressing plate 22 and a base 23; the pressing plate 22 is fixed to the base 23 on the guide rail by bolts.

[0013] Furthermore, the pressing plate 22 is located below the machine tool guide rail, and the base 23 is installed on the machine tool guide rail.

[0014] Preferably, the bearing 20 is fixed to the frame 9 through a front end cover 19 and a rear end cover 16 ; the front end cover 19 is located outside the sleeve 13 , and the rear end cover 16 is located inside the sleeve 13 and connected to the support 15 and the butterfly spring 10 .

[0015] Furthermore, the front cover 19 and the rear cover 16 are connected to the frame 9 by screws.

[0016] Preferably, the frame 9 includes an annular structure, a connecting platform structure connected to the side of the annular structure, and a base structure connected to the bottom of the annular structure.

[0017] Furthermore, the stand structure of the frame 9 is connected to the base mechanism through screws.

[0018] Furthermore, the cylinder 17 is connected to the frame 9 connecting platform structure.

[0019] Preferably, the elastic clamping tube 21 is made of spring steel.

[0020] Preferably, the outer side wall of the small end of the elastic clamping tube 21 is provided with a thread, and the adjusting nut 11 is mounted on the thread in a cooperative manner.

[0021] Beneficial effects achieved by this utility model:

[0022] (1) Compared with the traditional center frame, the new center frame can change the clamping force on the workpiece during processing by adjusting the number of butterfly springs and the cylinder pressure value, preventing processing deformation and thus improving the processing quality of the workpiece.

[0023] (2) Easy to operate. After adjusting the preload force in the early stage, you only need to turn the pneumatic valve switch each time you clamp to complete the clamping process, thereby improving work efficiency.

[0024] (3) Compared with the integrated holding type, the split center frame base is simpler to connect to the machine tool, there are fewer factors affecting the adjustment of the center frame, and it is easy to operate. When the split type is used, the processing cycle is short when replacing the frame, and consumables are less and more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a lever hinge type center frame in the prior art;

[0026] Figure 2 This is the general assembly drawing of the new center frame after assembly according to the present invention;

[0027] Figure 3 This is a diagram of the assembled new center frame base described in the present utility model;

[0028] Figure 4 It is a two-dimensional structural diagram of the frame of the utility model;

[0029] Figure 5 It is a two-dimensional structural schematic diagram of the clamping mechanism of the present utility model;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the shift fork of the utility model;

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the elastic clamp tube of the utility model. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the examples of the present invention more clear, the technical solutions in the examples of the present invention will be clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 2 to 7 As shown, a split-type holding self-centering center frame includes a base mechanism and a frame mechanism; the frame mechanism includes a frame body 9, a clamping mechanism and a power control mechanism;

[0035] The base mechanism is located at the bottom of the center frame and serves as its support mechanism. The frame body 9 is fixed above the base mechanism. The base mechanism includes a pressure plate 22 and a base 23. The pressure plate 22 is bolted to the base 23 on the guide rail. The pressure plate 22 is located below the machine tool guide rail, and the base 23 is mounted on the machine tool guide rail.

[0036] The clamping mechanism is fixed on the frame 9, and the clamping mechanism includes a butterfly spring 10, an adjusting nut 11, a sleeve 13, a round nut 14, a rear end cover 16, a front end cover 19, a bearing 20 and an elastic clamping tube 21; the elastic clamping tube 21 is a trumpet-shaped shell, and one side of the large mouth end is evenly divided into a plurality of petals along the circumferential mouth, and there is a gap between each petal. The inner diameter of the large mouth end when tightened is equivalent to the outer diameter of the part; the sleeve 13 is a trumpet-shaped shell that is sleeved on the outside of the large mouth end of the elastic clamping tube 21, and the outer end surface of the elastic clamping tube 21 cooperates with the inner end surface of the sleeve 13. The workpiece is clamped under the action of an external force. A butterfly spring 10 is placed near one end of the small opening of the elastic clamp tube 21 in the sleeve 13. An adjustment nut 11 is mounted outside the small opening and connected to the other end of the butterfly spring 10. The sleeve 13 and bearing 20 are secured together by a round nut 14, with the bearing 20 positioned above the sleeve 13. The bearing 20 is secured to the frame 9 via a front cover 19 and a rear cover 16. The front cover 19 is positioned outside the sleeve 13, while the rear cover 16 is positioned inside the sleeve 13 and connected to the support 15 and butterfly spring 10. The elastic clamp tube 21 is made of spring steel. The outer wall of the small opening of the elastic clamp tube 21 is threaded, and the adjustment nut 11 is mounted on these threads. The front cover 19 and rear cover 16 are screwed to the frame 9. The frame 9 comprises an annular structure, a connecting platform structure connected to the side of the annular structure, and a base structure connected below the annular structure. The base structure of the frame 9 is screwed to the base structure.

[0037] The power control mechanism includes a cylinder 17, a shift fork 12, and a pneumatic valve 18. The pneumatic valve 18 is connected to the cylinder 17. The shift fork 12 is Y-shaped, with its rod-shaped rear end connected to the cylinder 17 mounted on the side of the frame 9. The middle of the shift fork 12 is supported by a support 15. The fork-shaped opening at the front end of the shift fork 12 contacts the adjustment nut 11, forming a lever. Under the adjustment of the pneumatic valve 18, the front end of the shift fork 12 reciprocates to clamp the workpiece. The cylinder 17 is connected to the connecting platform structure of the frame 9.

[0038] The operation process of this utility model is:

[0039] When the new center frame is clamping the workpiece, first open the pneumatic valve 18, the fork 12 presses the adjusting nut 11 to compress the butterfly spring 10, the elastic clamping tube 21 moves to the right, and the clamping tube mouth opens. Pass the workpiece through the center frame, place the head into the three-jaw chuck and clamp it, close the pneumatic valve 18, the butterfly spring 10 recovers, and the adjusting nut 11 pulls the elastic clamping tube 21 to the left to clamp the tail of the workpiece. After the workpiece is processed, release the three jaws, open the pneumatic valve 18, and the elastic clamping tube 21 moves to the right to release the workpiece.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A split-type self-centering center frame, characterized in that: It comprises a base mechanism and a frame mechanism; the frame mechanism comprises a frame (9), a clamping mechanism and a power control mechanism; The base mechanism is located at the bottom of the center frame and serves as a center frame support mechanism; the frame body (9) is fixed above the base mechanism; The clamping mechanism is fixed on the upper part of the frame (9), and comprises a butterfly spring (10), an adjusting nut (11), a sleeve (13), a round nut (14), a rear end cover (16), a front end cover (19), a bearing (20) and an elastic clamping tube (21); the elastic clamping tube (21) is a trumpet-shaped shell, and one side of the large mouth end is evenly divided into a plurality of petals along the circumference of the mouth, and there is a gap between each petal, and the inner diameter size of the large mouth end when tightened is equivalent to the outer diameter size of the part; the sleeve (13) is sleeved on the large mouth of the elastic clamping tube (21) The trumpet-shaped housing on the outer side of the end, the outer end surface of the elastic clamping tube (21) and the inner end surface of the sleeve (13) cooperate to achieve the clamping of the workpiece under the action of external force; the butterfly spring (10) is placed on the end of the sleeve (13) close to the small opening of the elastic clamping tube (21), and the adjustment nut (11) is installed on the outer side of the small opening and connected to the other end of the butterfly spring (10); the sleeve (13) and the bearing (20) are fixed together by the round nut (14), and the bearing (20) is located above the sleeve (13); the bearing (20) is fixed on the frame (9); The power control mechanism includes a cylinder (17), a shift fork (12) and a pneumatic valve (18); the pneumatic valve (18) is connected to the cylinder (17); the shift fork (12) is Y-shaped, the rod-shaped rear end of the shift fork (12) is connected to the cylinder (17) installed on the side of the frame (9), and the middle of the shift fork (12) is supported by a support (15); the fork-shaped opening at the front end of the shift fork (12) contacts the adjusting nut (11), so that the shift fork (12) forms a lever, and under the adjustment of the pneumatic valve (18), the front end of the shift fork (12) reciprocates to achieve the clamping of the workpiece.

2. The split-type self-centering center frame according to claim 1 is characterized in that: The base mechanism comprises a pressing plate (22) and a base (23); the pressing plate (22) is fixed to the base (23) on the guide rail by means of bolts.

3. The split-type self-centering center frame according to claim 2 is characterized in that: The pressing plate (22) is located below the machine tool guide rail, and the base (23) is installed on the machine tool guide rail.

4. The split-type self-centering center frame according to claim 1 is characterized in that: The bearing (20) is fixed to the frame (9) through a front end cover (19) and a rear end cover (16); the front end cover (19) is located outside the sleeve (13), and the rear end cover (16) is located inside the sleeve (13) and is connected to the support (15) and the butterfly spring (10).

5. The split-type self-centering center frame according to claim 4 is characterized in that: The front end cover (19) and the rear end cover (16) are connected to the frame (9) by screws.

6. The split-type self-centering center frame according to claim 1 is characterized in that: The frame (9) comprises an annular structure, a connecting platform structure connected to the side of the annular structure, and a base structure connected to the bottom of the annular structure.

7. The split-type self-centering center frame according to claim 6 is characterized in that: The frame (9) base structure is connected to the base mechanism via screws.

8. The split-type self-centering center frame according to claim 6 is characterized in that: The cylinder (17) is connected to the frame (9) connecting platform structure.

9. The split-type self-centering center frame according to claim 1 is characterized in that: The elastic clamping tube (21) is made of spring steel.

10. The split-type self-centering center frame according to claim 1 is characterized in that: The outer side wall of the small end of the elastic clamping tube (21) is provided with a thread, and the adjusting nut (11) is mounted on the thread in a cooperative manner.