Center frame chuck locking structure

Abstract

The utility model discloses a center frame chuck locking structure which comprises a shell, a bearing assembly arranged in the shell, a center frame chuck arranged in the bearing assembly, a third locking nut used for tightening the center frame chuck and a belt pulley used for driving the third locking nut to rotate. The positioning disc is detachably fixed to the belt pulley and arranged outside the third locking nut in a sleeving mode, a first guide pin is arranged on the third locking nut, and a clamping groove used for clamping the first guide pin is formed in the positioning disc. By adopting the structure, a friction force bearing surface is changed on the contact surface of the positioning disc and the belt pulley, so that the contact area is greatly increased, the friction force is further greatly improved, the distance between an anti-rotation friction force bearing point and a rotation center is increased, a force arm is lengthened, and the friction torque is further improved; the locking nut can be further kept fastened, and the machining precision of parts is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of locking technology for the chuck of the rotary center frame of a CNC longitudinal cutting machine tool, and in particular to a locking structure for the center frame chuck. Background Technology

[0002] The existing CNC slitting machine tool rotary center rest chuck locking structure tightens the front center rest chuck by rotating the locking nut, but it cannot lock the chuck completely. It is necessary to ensure that there is a gap between the workpiece and the chuck so that the workpiece can move back and forth in the chuck. At the same time, in order to ensure that the center rest chuck does not loosen during high-speed rotation after being tightened to the required level, the CNC slitting machine tool center rest chuck locking structure is relatively complex. There are two main types of CNC slitting machine tool center rest chuck locking structures on the market.

[0003] Firstly, such as Figure 5 As shown, after the center frame chuck 11 is tightened to the required position, the first locking nut 21 with an opening at the rear end is expanded by the pointed support screw, so that the friction generated by its contact with the corresponding hole wall achieves the anti-loosening structure. The location of the friction force is as follows: Figure 5 As shown at point A. This structure requires high hardness of the support screw and support step pin, good elastic deformation of the first locking nut with the slotted opening at the rear end, relatively small support force that the screw can withstand, limited deformation of the outer circle of the first locking nut, limited friction, and a large amount of cutting oil during machining. During long-term high-speed operation, slight loosening may occur, affecting machining accuracy.

[0004] Secondly, such as Figure 6 , Figure 7 and Figure 8 As shown, it employs a pressure cap 31 and a second locking nut 32. After the center frame chuck 11 is tightened to the required position, the pressure cap 31 is deformed by the second locking nut 32, pressing the rear end ring of the second locking nut onto the pulley 15, thereby releasing the surface friction force. The location of the friction force is as follows. Figure 6 As shown at point B. Although the end-face friction generated by the deformation of the gland is greater than the friction generated by the first method using the tightening screw, the contact between the gland and the second locking nut is limited, and the resulting friction is still limited. During machining, a large amount of cutting oil is used, and slight loosening will still occur during long-term high-speed operation, affecting machining accuracy. Utility Model Content

[0005] In order to overcome the problems of low friction of the locking nut in the existing clamping structure, the presence of a large amount of cutting oil during processing, and slight loosening during long-term high-speed operation, which affects the processing accuracy, this utility model provides a center frame chuck locking structure.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model provides a center frame chuck locking structure, including a housing, a bearing assembly placed inside the housing, a center frame chuck placed inside the bearing assembly, a third locking nut for tightening the center frame chuck, and a pulley for driving the third locking nut to rotate.

[0008] It also includes a positioning plate that is detachably fixed to the pulley and sleeved outside the third locking nut. The third locking nut is provided with a first guide pin, and the positioning plate is provided with a slot for engaging the first guide pin.

[0009] In one possible design, the positioning disc is provided with a guide cylinder sleeved outside the third locking nut, and the slot is provided on the guide cylinder.

[0010] In one possible design, the positioning plate is fixed to the pulley by fixing bolts, and the positioning plate is provided with arc-shaped holes for installing the fixing bolts.

[0011] In one possible design, there are at least three arc-shaped holes that are evenly distributed along the circumference of the positioning disk.

[0012] In one possible design, the bearing assembly includes a bearing and a second guide pin disposed on the bearing to guide the center support chuck.

[0013] This utility model has the following advantages:

[0014] 1. This solution achieves the transmission between the third locking nut and the pulley by using a structure with guide pins and positioning discs. This changes the friction force application surface to the contact surface between the positioning disc and the pulley, greatly increasing the contact area and thus significantly improving the friction force.

[0015] 2. By adopting the above structure, the distance between the anti-rotation friction force application point and the rotation center is increased, the lever arm is lengthened, and thus the friction torque is improved. During long-term high-speed operation, the locking nut can be further tightened to ensure the machining accuracy of the parts. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a cross-sectional view of the center frame clamp locking structure of this utility model;

[0018] Figure 2 This is a side view of the center frame clamping structure of this utility model;

[0019] Figure 3 This is a perspective view of the center frame clamp locking structure of this utility model from one angle;

[0020] Figure 4 This is a perspective view of the center frame clamp locking structure of this utility model from another angle;

[0021] Figure 5 This is a schematic diagram of the first type of existing center frame clamping structure;

[0022] Figure 6 A cross-sectional view of the second structure of the existing center frame clamping structure;

[0023] Figure 7 A perspective view of the second structure of the existing center frame clamping structure;

[0024] Figure 8 This is a perspective view of a second structure of the existing center frame clamping structure. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] To overcome the problems of low friction in existing clamping structures' locking nuts, excessive cutting oil during machining, and slight loosening during long-term high-speed operation, which affects machining accuracy, this utility model discloses a center rest chuck locking structure. For example... Figures 1 to 4 As shown, the clamping structure includes a housing 12, a bearing assembly, a center frame chuck 11, a third locking nut 13, a pulley 15, and a positioning plate 14. The structure and connection relationship of the housing 12, the bearing assembly, and the center frame chuck 11 are existing technologies.

[0032] The bearing assembly is positioned between the center frame chuck 11 and the housing 12, with the center frame chuck 11 coaxially arranged with the bearing assembly. A third locking nut 13 is positioned at one end of the center frame chuck 11 to tighten the center frame chuck 11. A pulley 15 drives the third locking nut 13 to rotate. A positioning disc 14 is detachably fixed to the pulley 15 and sleeved around the third locking nut 13. A first guide pin 131 is provided on the third locking nut 13, and a slot 141 for engaging the first guide pin 131 is provided on the positioning disc 14.

[0033] The above structure has a slot on the positioning plate and a first positioning pin on the third locking nut. The center frame chuck can be adjusted according to the diameter of the bar stock, that is, the third locking nut can move back and forth during adjustment.

[0034] By adopting the above structure, the contact area of ​​the locking surface is increased, and the friction force is shifted to the contact surface between the positioning plate and the pulley, such as... Figure 1 As shown at point C, compared to existing technologies, the contact area is increased by more than 3 times, which means the friction force is increased by more than 3 times.

[0035] By adopting the above structure, the distance between the anti-rotation friction force application point and the rotation center is increased, the lever arm is lengthened by 2 times, and the friction torque is 6 times the original torque. This can effectively keep the locking nut tight during long-term high-speed operation and ensure the machining accuracy of the parts.

[0036] The positioning plate can directly adopt a ring-shaped structure, with a groove directly formed on the end face to create a slot for the first guide pin. However, this structure results in a thicker positioning plate. Therefore, a preferred design is... Figure 2 , 4 As shown, the positioning disk 14 is provided with a guide cylinder 142 sleeved on the third locking nut 13, and the slot 141 is provided on the guide cylinder.

[0037] The positioning disc 14 and the pulley 15 are detachably connected, and this can be achieved in various ways. For example, a bolted connection can be used. When using a bolted connection, to facilitate the installation of the positioning disc 14 and the third locking nut 13 into the correct slot 141, the positioning disc 14 is fixed to the pulley 15 by fixing bolts 17. The positioning disc 14 is provided with an arc-shaped hole 143 for installing the fixing bolts 17.

[0038] To improve stability, there are at least three arc-shaped holes 143, which are evenly distributed around the circumference of the positioning disk 14.

[0039] The bearing assembly includes a bearing 161 and a second guide pin 162 disposed on the bearing to guide the center frame chuck 11.

[0040] This type of rotary center frame chuck locking structure can overcome the technical bottleneck of slight loosening during long-term high-speed operation, which affects machining accuracy; it can save on product manufacturing costs and equipment consumable costs, and improve product production cycle and product reliability.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A center frame chuck locking structure, comprising a housing (12), a bearing assembly disposed within the housing (12), a center frame chuck (11) disposed within the bearing assembly, a third locking nut (13) for tightening the center frame chuck (11), and a pulley (15) for driving the third locking nut (13) to rotate, characterized in that: It also includes a positioning plate (14) that is detachably fixed on the pulley (15) and sleeved on the third locking nut (13). The third locking nut (13) is provided with a first guide pin (131), and the positioning plate (14) is provided with a slot (141) for locking the first guide pin (131).

2. The centering collet chucking structure according to claim 1, wherein: The positioning disc (14) is provided with a guide cylinder (142) sleeved outside the third locking nut (13), and the slot (141) is provided on the guide cylinder.

3. The centering collet chucking structure according to claim 1, wherein: The positioning plate (14) is fixed to the pulley (15) by a fixing bolt (17), and the positioning plate (14) is provided with an arc-shaped hole (143) for installing the fixing bolt (17).

4. The centering collet chucking structure according to claim 3, wherein: There are at least three arc-shaped holes (143) and they are evenly distributed around the circumference of the positioning disk (14).

5. The center mount chuck locking structure of claim 1, wherein: The bearing assembly includes a bearing (161) and a second guide pin (162) disposed on the bearing to guide the center frame chuck (11).

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