A slider type pull-down power head

Abstract

The utility model discloses a slider formula is pulled down power head relates to lathe processing technical field, including seat body and cylinder, seat body bottom is equipped with ring groove, and the cylinder is equipped in the ring groove and reserves assembly gap, and both are rotatablely connected through outer pin hole, inner pin hole and pin shaft, the inside seat body is connected through multi -specification bearing transmission axle stem, and its top end fixedly links the cutter holder of the groovy body, is equipped with spring chuck in the groovy body, and after cutter handle inserts, the nut of cutter holder external thread connection restrains spring chuck contraction and realizes clamping. The structure can only let the cylinder deflection when locking generates horizontal component, and the seat body and the cutter keep stable, avoid the cutter deviation, reduce assembly error, improve cutter clamping stability and adaptability simultaneously, guarantee processing accuracy and surface quality.

Description

Technical Field

[0001] This utility model relates to the field of machine tool processing technology, and in particular to a slider-type pull-down power head. Background Technology

[0002] In the field of machine tool processing, the turret tool holder is the core component for tool installation and transmission. Its structural stability directly affects the machining accuracy. Most existing tool holders adopt an integrated design for the base and cylinder. When they are used in conjunction with the turret locking mechanism, the tool often tilts due to the problem of locking force transmission, which affects the machining quality.

[0003] Specifically, tool holder locking usually relies on a hydraulic cylinder to drive the locking plate. The locking plate and the bottom slot of the tool holder transmit the locking force through the cooperation of the inclined surface. During this process, the inclined surface will generate a horizontal component force. When the integrated tool holder is subjected to this force, the whole is prone to tilting, which will cause the tool to deviate, resulting in assembly errors, which will lead to a decrease in the dimensional accuracy of the machined parts and a deterioration in the surface quality. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a slider-type pull-down power head.

[0005] This utility model proposes a slider-type pull-down power head, including a base body. The bottom of the base body has an annular groove, and a cylinder body is assembled inside the annular groove. An assembly gap is reserved between the annular groove and the cylinder body. The base body and the cylinder body are assembled and fixed by an outer pin hole, an inner pin hole, and a pin shaft. After assembly, the base body and the cylinder body rely on the assembly gap, so that the cylinder body can move independently relative to the base body.

[0006] Furthermore, the outer pin holes are symmetrically opened at the bottom of the base body and are connected to the annular groove. The inner pin holes are opened on the side of the cylinder body, and the pin shaft is connected inside the outer pin holes and the inner pin holes.

[0007] Furthermore, the bottom of the cylinder is symmetrically provided with lower locking grooves, and the bottom surface of the lower locking grooves is set as an inclined surface.

[0008] Furthermore, a drive shaft is rotatably connected inside the base, and a tool holder is fixedly connected to the top end of the drive shaft. The top end of the tool holder has a downwardly extending groove for accommodating the tool.

[0009] Furthermore, a spring collet is provided in the groove of the tool holder, the tool shank is inserted inside the spring collet, and a nut is threaded onto the outside of the tool holder to constrain the clamping end of the spring collet to retract, thereby clamping and fixing the tool.

[0010] Furthermore, the base and the drive shaft are rotatably connected by several bearings of different sizes.

[0011] The beneficial effects of this utility model are as follows: By designing the base and the cylinder as a separate structure, and with the reserved assembly gap between them and the rotatable connection of the pin, when the hydraulic cylinder drives the locking plate to transmit the locking force through the inclined surface and generate a horizontal component force, only the cylinder under force will wobble, while the base and the internally installed transmission shaft, tool holder and tool will remain stable and not tilted. This effectively avoids the tool offset problem caused by the horizontal component force of the integrated tool holder, reduces assembly errors from the root, and ensures that the tool always maintains a precise posture during the processing, thereby significantly improving the dimensional accuracy and surface quality of the processed parts. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the disassembled structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the middle seat of this utility model; Figure 3 This is a schematic diagram of the assembly structure of this utility model; Figure 4 This is a half-sectional view of the assembled version of this utility model; Figure 5 This is a schematic diagram of the structure of the present invention, which uses a hydraulic cylinder and a locking plate to lock the tool holder.

[0013] In the diagram: 1. Base; 11. Outer pin hole; 12. Annular groove; 2. Cylinder; 21. Inner pin hole; 22. Pin shaft; 23. Lower locking groove; 4. Drive shaft; 41. Bearing; 5. Tool holder; 6. Spring collet; 7. Nut; 8. Hydraulic cylinder; 9. Push plate; 10. Locking plate. Detailed Implementation

[0014] Reference Figure 1-5 The present invention proposes a slider-type pull-down power head, including a base body 1 and a cylinder body 2. The base body 1 is integrally formed of high-strength alloy material to ensure structural rigidity and processing accuracy. Its bottom is recessed inward to form an annular groove 12. The inner diameter of the annular groove 12 is precisely matched with the outer diameter of the cylinder body 2. When assembling the annular groove 12 and the cylinder body 2, an assembly gap of 0.1-0.3mm is reserved. This gap provides the necessary space for the independent movement of the cylinder body 2 relative to the base body 1. To achieve a detachable and fixed assembly between the base 1 and the cylinder 2, two sets of external pin holes 11 are symmetrically provided at the bottom of the base 1. The external pin holes 11 penetrate the side wall of the base 1 and communicate with the inside of the annular groove 12. The axes of the two sets of external pin holes 11 are on the same horizontal plane to ensure balanced force. Correspondingly, an internal pin hole 21 is provided on the side of the cylinder 2 at a position corresponding to the external pin holes 11. The diameter of the internal pin hole 21 is exactly the same as the diameter of the external pin hole 11. During assembly, the cylinder 2 is flat... The cylinder is placed securely into the annular groove 12 of the base 1. The cylinder 2 is rotated to precisely align the inner pin hole 21 with the outer pin hole 11. Then, the pin 22 is inserted from one end of the outer pin hole 11 until the other end of the pin 22 penetrates to the bottom of the inner pin hole 21. Through the axial limiting effect of the pin 22, the base 1 and the cylinder 2 are initially fixed. At the same time, thanks to the assembly gap reserved between the annular groove 12 and the cylinder 2, the cylinder 2 can make a small radial movement within the constraint range of the pin 22.

[0015] The cylinder 2 serves as the bottom locking and fitting component of the tool holder. It has two sets of lower locking slots 23 symmetrically opened at the bottom. The positions of the two sets of lower locking slots 23 correspond to the locking mechanism of the tool turret. The bottom surface of the lower locking slots 23 is designed as an inclined surface with an inclination angle of 15-20°. This inclined structure can form a wedge-shaped fit with the locking block of the locking mechanism during the tool holder locking process. The guiding effect of the inclined surface makes the locking smoother and enhances the stability after locking, preventing the locking from loosening due to vibration during the machining process. A transmission shaft 4 is vertically arranged inside the base 1. The transmission shaft 4 is made of high-strength alloy steel and has undergone heat treatment to ensure torsional strength and wear resistance under high-speed rotation. To achieve flexible rotational connection between the transmission shaft 4 and the base 1, several bearings 41 of different sizes are assembled at the mating part of the base 1 and the transmission shaft 4. The bearings 41 are precision rolling bearings and are distributed at intervals along the axial direction of the transmission shaft 4. Among them, the bearings 41 located at the upper part of the transmission shaft 4 have a larger outer diameter and mainly bear radial load and part of the axial load, while the bearings 41 located at the lower part have a smaller outer diameter and focus on assisting radial positioning. The combination design of multiple bearings effectively reduces the friction coefficient of the transmission shaft 4 during rotation, improves rotational accuracy and stability, and ensures that the tool maintains a constant speed during processing. The top end of the drive shaft 4 is fixed to the tool holder 5 via a key connection. The connection surface adopts a transition fit to ensure the reliability of torque transmission and avoid relative slippage during high-speed rotation. The top end of the tool holder 5 has a downward-extending cylindrical groove. The inner diameter of the groove is designed according to the size of commonly used tool holders, and the inner wall of the groove is precision ground to ensure the fitting accuracy with the spring collet 6. The spring collet 6 is made of elastic alloy material and has an overall conical structure. It has evenly distributed elastic opening slots on the outside, which extend along the axial direction of the spring collet 6, giving the clamping end of the spring collet 6 good contraction elasticity. During assembly, the spring collet 6 is inserted from the top end of the groove of the tool holder 5. The conical outer wall of the spring collet 6 fits tightly with the conical inner wall of the groove, forming a conical mating structure. When installing the tool, insert the tool shank into the center through hole of the spring collet 6. After ensuring that the insertion depth of the tool shank meets the machining requirements, rotate the nut 7 on the outside of the tool holder 5. The nut 7 is connected to the outside of the tool holder 5 by a fine thread. The fine thread has the characteristics of good self-locking and smooth transmission, which can effectively prevent the nut from loosening due to machining vibration. As the nut 7 is tightened, the lower end of the inner wall of the nut 7 abuts against the top of the clamping end of the spring collet 6 and applies axial pressure, forcing the clamping end of the spring collet 6 to retract inward along the inner wall of the conical groove. The tool is clamped and fixed by the friction between the inner wall of the spring collet 6 and the tool shank. This clamping method is not only convenient to install, but also adaptable to tool shanks of different diameters (within the elastic range of the spring collet 6). Moreover, it has high clamping accuracy and can effectively ensure the coaxiality of the tool during the machining process, reducing the impact of cutting vibration on machining accuracy.

[0016] When in use, this tool holder needs to be used in conjunction with hydraulic cylinder 8, push plate 9, and locking plate 10 to lock the tool holder inside the turret with the help of external force, as detailed below: During the locking process, the piston rod of the hydraulic cylinder 8 extends and pushes the push plate 9 and the locking plate 10 together to move towards the tool holder. The bottom of the locking plate 10 is symmetrically provided with an upper locking groove 23 that is complementary in shape to the lower locking groove 23. So when the locking plate 10 moves towards the tool holder, the inclined surfaces of the upper and lower locking grooves will generate a downward force. From the perspective of force decomposition, this force is a vertical downward force and a horizontal leftward force. However, this horizontal leftward force will cause the tool holder and the installed tool to tilt. So to avoid this problem, we make the base 1 and the cylinder 2 into separate parts and leave an assembly gap between them. In addition, they are rotatably connected by a pin. So when the leftward force acts on the cylinder 2, it will cause the cylinder 2 to wobble, while the base 1 and the internal tool will not tilt. This avoids assembly errors.

[0017] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A slider-type pull-down power head, characterized in that, The device includes a base (1), with an annular groove (12) at the bottom. A cylindrical body (2) is assembled inside the annular groove (12). An assembly gap is reserved between the annular groove (12) and the cylindrical body (2). The base (1) and the cylindrical body (2) are assembled and fixed by an outer pin hole (11), an inner pin hole (21), and a pin shaft (22). After assembly, the base (1) and the cylindrical body (2) rely on the assembly gap, so that the cylindrical body (2) can move independently relative to the base (1).

2. The slider-type pull-down power head according to claim 1, characterized in that, The outer pin hole (11) is symmetrically opened at the bottom of the base (1), and the outer pin hole (11) is connected to the annular groove (12). The inner pin hole (21) is opened on the side of the cylinder (2). The pin shaft (22) is connected inside the outer pin hole (11) and the inner pin hole (21).

3. The slider-type pull-down power head according to claim 1, characterized in that, The bottom of the cylinder (2) is symmetrically provided with a lower locking groove (23), and the bottom surface of the lower locking groove (23) is set as an inclined surface.

4. The slider-type pull-down power head according to claim 1, characterized in that, The seat (1) is rotatably connected to a transmission shaft (4), and a tool holder (5) is fixedly connected to the top of the transmission shaft (4). The top of the tool holder (5) has a downwardly extending groove for accommodating the tool.

5. A slider-type pull-down power head according to claim 4, characterized in that, A spring collet (6) is provided in the groove of the tool holder (5), and the tool shank is inserted inside the spring collet (6). A nut (7) is threaded onto the outside of the tool holder (5) to constrain the clamping end of the spring collet (6) to retract, thereby clamping and fixing the tool.

6. A slider-type pull-down power head according to claim 4, characterized in that, The seat (1) and the transmission shaft (4) are rotatably connected by several bearings (41) of different sizes.

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