Mechanism for preventing chuck from being damaged by clamping of workpiece for lathe

Abstract

The mechanism comprises a clamping seat, three grooves symmetrically distributed around the axis of the clamping seat are formed in one end of the clamping seat, clamping jaw structures are arranged in the grooves, a driving device is arranged in the clamping seat, a connecting shaft is arranged at one end of the back face of the clamping seat, and a fixing block is fixedly installed on the outer wall of the connecting shaft. The clamping jaw structure comprises a clamping base, a main clamping jaw head and an auxiliary clamping jaw head. According to the clamping jaw structure, the structural design of preventing a workpiece from being clamped is adopted, when the workpiece is clamped, the driving device drives the three clamping bases to be close to one another, at the moment, the auxiliary clamping jaw head makes contact with the workpiece firstly and drives the first telescopic pipe to slide along the second telescopic pipe under the reverse pressure of the workpiece, and therefore the pressure spring is compressed; when the auxiliary clamping jaw head moves to be flush with the main clamping jaw head and the nut is screwed and cannot rotate, clamping and fixing of the workpiece are completed, the clamping strength of the main clamping jaw head is divided through reverse elastic force of the pressure spring, and therefore damage to the workpiece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chuck mechanisms, in particular to a workpiece-preventing chuck mechanism for a lathe. Background Art

[0002] A chuck is a mechanical device used to clamp workpieces on machine tools. It mainly uses the radial movement of movable jaws evenly distributed on the chuck body to clamp and position the workpiece. A chuck generally consists of three parts: a chuck body, movable jaws, and a jaw drive mechanism. The chuck body has a minimum diameter of 65 mm and a maximum of 1500 mm. There is a through hole in the center to allow the workpiece or bar to pass through. The back has a cylindrical or short conical structure, which is connected to the end of the machine tool spindle directly or through a flange. Chucks are usually installed on lathes, external cylindrical grinders, and internal cylindrical grinders. They can also be used in conjunction with various indexing devices for milling machines and drilling machines.

[0003] Currently, the most common chucks on the market are mainly three-jaw chucks. When clamping materials, the three jaws are close to each other to fix the materials. However, since the materials require a large clamping torque during the processing, especially some round bar-shaped materials, in order to prevent them from rotating during processing, the clamping torque is sometimes so large that it damages the materials, affecting the quality of the materials after processing. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies of the prior art and provide a chuck mechanism for preventing workpiece pinching for a lathe, so as to solve the problems raised in the background art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A chuck mechanism for preventing workpiece pinching for a lathe comprises a clamping seat, wherein one end of the front side of the clamping seat is provided with three grooves symmetrically distributed around the axis of the clamping seat, a claw structure is provided inside the groove, a driving device is provided inside the clamping seat, and one end of the back side of the clamping seat is provided with a connecting shaft, and a fixing block is fixedly mounted on the outer wall of the connecting shaft;

[0007] The clamping claw structure includes a clamping seat, the cross-sectional size of the clamping seat is adapted to the size of the groove, and is designed to slide with the groove. A main clamping claw head is fixedly installed at one end of the three clamping seats close to each other, and auxiliary clamping claw heads are provided on both sides of the main clamping claw head. The auxiliary clamping claw head is made of elastic rubber material, and has a wavy appearance at the end away from the clamping seat.

[0008] As a preferred solution for a chuck mechanism to prevent workpiece pinching for a lathe, a connecting block is fixedly installed on the side wall of the auxiliary clamping jaw head near the clamping base, and a first telescopic tube is fixedly installed on the connecting block near the side wall of the clamping base. A second telescopic tube is slidingly sleeved on the first telescopic tube, and the second telescopic tube is fixedly installed inside the clamping base. A pressure spring is provided inside the second telescopic tube, and both ends of the pressure spring are fixedly connected to the first telescopic tube and the second telescopic tube respectively.

[0009] As a preferred solution for the chuck mechanism for preventing workpiece pinching for lathes, limit blocks are fixedly installed on the outer walls of both sides of the clamping seat, and limit grooves for sliding limit blocks are provided on both sides of the groove inside the clamping seat, and multiple arc grooves are provided on the side walls of the clamping seat close to the connecting shaft.

[0010] As a preferred solution for the anti-workpiece pinching chuck mechanism for lathes, the driving device includes a bevel gear ring rotatably mounted inside the clamping seat, the bevel gear ring is fixedly mounted with a flat thread close to the side wall of the clamping seat, wherein a section of the flat thread is located inside the arc groove, a driving gear is meshed on the back of the bevel gear ring, a screwing nut is fixedly mounted on the top of the driving gear, and the screwing nut is rotatably connected to the clamping seat.

[0011] As a preferred solution for the anti-workpiece pinching chuck mechanism for lathes, the number of the fixing blocks is three, and they are distributed in a circle around the outer wall of the connecting shaft. The inner diameter of the connecting shaft matches the inner diameter of the clamping seat, and a fixing hole is opened inside the fixing block.

[0012] Beneficial effects of the utility model:

[0013] The clamping claw structure of the present invention adopts a structural design that prevents workpieces from being pinched. When clamping a workpiece, the three clamping seats are driven close to each other by the driving device. At this time, the auxiliary clamping claw head first contacts the workpiece and, under the reverse pressure of the workpiece, drives the first telescopic tube to slide along the second telescopic tube, thereby compressing the pressure spring. When the auxiliary clamping claw head moves to be flush with the main clamping claw head and the nut cannot be rotated by turning, the clamping and fixing of the workpiece is completed. The utility model distributes the clamping strength of the main clamping claw head through the reverse elastic force of the pressure spring, thereby reducing damage to the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0015] Figure 1It is a schematic diagram of the overall structure of the lathe workpiece prevention chuck mechanism of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the connecting shaft and its components described in the present utility model.

[0017] Figure 3 It is a structural schematic diagram of the driving device described in the utility model.

[0018] Figure 4 It is a structural schematic diagram of the claw structure described in the utility model.

[0019] Figure 5 It is a structural schematic diagram of the auxiliary clamping claw head and its components described in the utility model.

[0020] In the picture:

[0021] 1. Clamping seat; 2. Groove; 3. Claw structure; 301. Clamping seat; 302. Main claw head; 303. Connecting block; 304. Auxiliary claw head; 305. First telescopic tube; 306. Second telescopic tube; 307. Pressure spring; 308. Limit block; 309. Arc groove; 4. Driving device; 401. Conical gear ring; 402. Flat thread; 403. Driving gear; 404. Tightening nut; 5. Connecting shaft; 6. Fixing block; 7. Fixing hole. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] In the description of this utility model, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two components or an interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0026] like Figures 1 to 5 As shown, the utility model provides a chuck mechanism for preventing workpiece pinching for a lathe, comprising a clamping base 1, three grooves 2 symmetrically distributed around the axis of the clamping base 1 are provided at one end of the front side of the clamping base 1, a claw structure 3 is provided inside the groove 2, a driving device 4 is provided inside the clamping base 1, a connecting shaft 5 is provided at one end of the back side of the clamping base 1, and a fixing block 6 is fixedly installed on the outer wall of the connecting shaft 5.

[0027] In this embodiment, the claw structure 3 specifically includes a clamping seat 301, the cross-sectional dimensions of the clamping seat 301 are adapted to the size of the groove 2, and are designed to slide with the groove 2. The main clamping claw head 302 is fixedly installed at one end of the three clamping seats 301 close to each other, and auxiliary clamping claw heads 304 are provided on both sides of the main clamping claw head 302. The auxiliary clamping claw head 304 is made of elastic rubber material, and has a wavy appearance at the end away from the clamping seat 301. The wavy appearance can increase the friction between the auxiliary clamping claw head 304 and the workpiece, thereby preventing the workpiece from rotating during the clamping process, which affects the processing effect.

[0028] In this embodiment, a connecting block 303 is fixedly installed on the side wall of the secondary clamping claw head 304 near the clamping base 301, and a first telescopic tube 305 is fixedly installed on the connecting block 303 near the side wall of the clamping base 301. A second telescopic tube 306 is slidingly sleeved on the first telescopic tube 305, and the second telescopic tube 306 is fixedly installed inside the clamping base 301. A pressure spring 307 is provided inside the second telescopic tube 306, and the two ends of the pressure spring 307 are fixedly connected to the first telescopic tube 305 and the second telescopic tube 306 respectively. When it is necessary to clamp the workpiece, the drive device 4 drives the three clamping seats 301 to approach each other. At this time, the auxiliary clamping claw head 304 first contacts the workpiece, and under the reverse pressure of the workpiece, it drives the first telescopic tube 305 to slide along the second telescopic tube 306, thereby compressing the pressure spring 307. When the auxiliary clamping claw head 304 moves to be flush with the main clamping claw head 302, the clamping and fixation of the workpiece is completed. The clamping strength of the main clamping claw head 302 is shared by the reverse elastic force of the pressure spring 307, thereby reducing damage to the workpiece.

[0029] Preferably, the outer walls on both sides of the clamping base 301 of this embodiment are fixedly installed with limit blocks 308, and the interior of the clamping base 1 is provided with limit grooves on both sides of the groove 2 for the limit blocks 308 to slide. The limit blocks 308 can be embedded in the limit grooves of the groove 2 to prevent the clamping base 301 from detaching from the clamping base 1.

[0030] In this embodiment, the driving device 4 includes a bevel gear ring 401 rotatably mounted within the clamping base 1. A flat thread 402 is fixedly mounted on the side wall of the bevel gear ring 401 near the clamping base 301. A plurality of arcuate grooves 309 are formed on the side wall of the clamping base 301 near the connecting shaft 5. A section of the flat thread 402 is located within the arcuate groove 309. The arcuate groove 309 is configured to engage the flat thread 402. A driving gear 403 is meshed with the back of the bevel gear ring 401. A screw nut 404 is fixedly mounted on the top of the driving gear 403. The screw nut 404 is rotatably connected to the clamping base 1. When the spacing between the three clamping bases 301 needs to be adjusted, a worker can use a tool to rotate the screw nut 404 to drive the driving gear 403 to rotate. Since the driving gear 403 meshes with the bevel gear ring 401, it can drive the bevel gear ring 401 and the flat thread 402 to rotate. This, in turn, drives the three clamping bases 301 to slide within the groove 2 via the flat thread 402 and the arcuate grooves 309.

[0031] In this embodiment, there are three groups of fixing blocks 6, which are distributed in a circle around the outer wall of the connecting shaft 5. The inner diameter of the connecting shaft 5 matches the inner diameter of the clamping seat 1. A fixing hole 7 is provided inside the fixing block 6. The connecting shaft 5 can be disassembled and assembled with the clamping seat 1 through the fixing block 6 and the fixing hole 7 to connect to external power through the connecting shaft 5.

[0032] The working principle and usage process of this utility model:

[0033] When in use, the staff can use a tool to rotate and screw the nut 404 to drive the driving gear 403 to rotate. Since the driving gear 403 is engaged with the bevel gear ring 401, the bevel gear ring 401 and the plane thread 402 can be driven to rotate, and then the three clamping seats 301 are driven to slide inside the groove 2 through the plane thread 402 and the arc groove 309. When it is necessary to clamp the workpiece, the three clamping seats 301 approach each other. At this time, the secondary clamping claw head 304 first contacts the workpiece, and under the reverse pressure of the workpiece, it drives the first telescopic tube 305 to slide along the second telescopic tube 306, thereby compressing the pressure spring 307. When the secondary clamping claw head 304 moves to be flush with the main clamping claw head 302 and the nut 404 cannot be rotated by screwing, the clamping and fixing of the workpiece is completed. The utility model shares the clamping strength of the main clamping claw head 302 through the reverse elastic force of the pressure spring 307, thereby reducing damage to the workpiece.

[0034] It should be noted that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that various modifications, equivalent substitutions, and variations may be made to the present invention. However, as long as these modifications do not depart from the spirit of the present invention, they are within the scope of protection of the present invention. Furthermore, certain terms used in the specification and claims of this application are not intended to be limiting but are provided for ease of description only.

Claims

1. A chuck mechanism for preventing workpiece pinching for a lathe, characterized in that: The clamping base (1) comprises a clamping base (1), wherein one end of the front side of the clamping base (1) is provided with three grooves (2) symmetrically distributed around the axis of the clamping base (1), a claw structure (3) is provided inside the groove (2), a driving device (4) is provided inside the clamping base (1), and one end of the back side of the clamping base (1) is provided with a connecting shaft (5), and a fixing block (6) is fixedly installed on the outer wall of the connecting shaft (5); The clamping claw structure (3) includes a clamping seat (301), the cross-sectional dimensions of the clamping seat (301) are adapted to the size of the groove (2), and the clamping seat (301) is designed to slide with the groove (2), and a main clamping claw head (302) is fixedly installed at one end of the three clamping seats (301) close to each other, and auxiliary clamping claw heads (304) are provided on both sides of the main clamping claw head (302), and the auxiliary clamping claw heads (304) are made of elastic rubber material, and the end away from the clamping seat (301) has a wavy appearance.

2. The anti-workpiece pinching chuck mechanism for a lathe according to claim 1, characterized in that: The secondary clamping claw head (304) is fixedly mounted with a connecting block (303) near the side wall of the clamping base (301); the connecting block (303) is fixedly mounted with a first telescopic tube (305) near the side wall of the clamping base (301); a second telescopic tube (306) is slidably sleeved on the first telescopic tube (305); the second telescopic tube (306) is fixedly mounted inside the clamping base (301); a pressure spring (307) is arranged inside the second telescopic tube (306), and both ends of the pressure spring (307) are fixedly connected to the first telescopic tube (305) and the second telescopic tube (306), respectively.

3. The workpiece-preventing chuck mechanism for a lathe according to claim 2, characterized in that: Limit blocks (308) are fixedly mounted on the outer walls of both sides of the clamping seat (301); limiting grooves for the limiting blocks (308) to slide are provided on both sides of the groove (2) inside the clamping seat (1); and a plurality of arc grooves (309) are provided on the side walls of the clamping seat (301) close to the connecting shaft (5).

4. The anti-workpiece pinching chuck mechanism for a lathe according to claim 3, characterized in that: The driving device (4) comprises a bevel gear ring (401) rotatably mounted inside the clamping seat (1); a plane thread (402) is fixedly mounted on the side wall of the bevel gear ring (401) close to the clamping seat (301); a section of the plane thread (402) is located inside the arc groove (309); a driving gear (403) is meshed on the back of the bevel gear ring (401); a screwing nut (404) is fixedly mounted on the top of the driving gear (403); and the screwing nut (404) is rotatably connected to the clamping seat (1).

5. The workpiece-preventing chuck mechanism for a lathe according to claim 1, characterized in that: The number of the fixing blocks (6) is three, and they are distributed in a circle around the outer wall of the connecting shaft (5). The inner diameter of the connecting shaft (5) matches the inner diameter of the clamping seat (1). The fixing blocks (6) are provided with fixing holes (7) inside.

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