Chuck

Abstract

The utility model provides a chuck and belongs to the technical field of machinery. The problem that replacement is inconvenient is solved. A cavity is formed in the chuck body, the driving air cylinder is connected to the rear end of the chuck body, a piston rod of the driving air cylinder extends into the chuck body and is fixedly connected with a pull rod, three sliding blocks are slidably connected to the front end of the chuck body in the radial direction, swing rods are arranged between the three sliding blocks and the pull rod respectively, and an installation base is fixedly connected into the chuck body through a fastener. The pull rod is arranged in the mounting base in a sliding mode, the three swing rods are hinged to the mounting base, the inner end of each swing rod extends into the mounting base and is connected with the pull rod, and the outer end of each swing rod is connected with the corresponding sliding block. The utility model has the advantage of convenient replacement.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a chuck. Background Art

[0002] In existing machine tool processing, three-jaw chucks are widely used to clamp workpieces. For example, a three-jaw chuck disclosed in patent application No. 201920564422.X comprises an annular chuck body and three jaws. The chuck body is provided with three slide grooves, which are evenly distributed on the end surface of the chuck body around the center of the chuck body. A slider is slidably connected to the slide groove, and the three jaws are respectively connected to the three sliders. The three-jaw chuck also comprises a transmission assembly, which comprises three rotating parts, a driving cylinder, and a moving block. Three grooves are provided on the inner side wall of the chuck body, and the three grooves are respectively directly below the three slide grooves and are connected with the adjacent slide grooves. A first groove is provided on the side wall of the slider facing the corresponding groove, and the first groove is connected with the corresponding groove. The moving block is slidably connected to the inner side wall of the chuck body, and three second grooves are provided on the side wall of the moving block. The three second grooves face the three grooves respectively. The rotating part is V-shaped, and the three rotating parts are rotatably connected in the three grooves respectively. The two ends of the rotating part are respectively inserted into the adjacent first groove and second groove. The driving cylinder is used to drive the moving block to move along the axial centerline direction of the chuck body. When in use, the driving cylinder drives the moving block to move toward the side away from the claws, and the moving block drives the three rotating parts to rotate. The end of the rotating part in the second slot flips toward the side away from the claws, and through the action of the lever, the end of the rotating part in the first slot flips toward the center of the chuck body, thereby driving the contacting sliders to slide toward the center of the chuck body, so that the three claws complete the clamping of the workpiece; when the workpiece needs to be unloaded, it is only necessary to drive the cylinder to drive the moving block to reset, and the three claws are away from the center of the chuck body, so that the clamping of the workpiece can be released.

[0003] However, the above-mentioned three-jaw chuck also has shortcomings: the three rotating parts are directly rotatably connected to the three grooves inside the chuck body. If the chuck body is damaged and needs to be replaced, it is necessary to remove the rotating parts from the old chuck body one by one and then install them one by one on the new chuck body. Obviously, there is great inconvenience during replacement. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a chuck to solve the problem of inconvenient replacement.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The chuck comprises a chuck body with a cavity inside and a driving cylinder connected to the rear end of the chuck body, the piston rod of the driving cylinder extends into the chuck body and is fixedly connected with a pull rod, the front end of the chuck body is radially slidably connected with three sliders, and rocker rods are respectively provided between the three sliders and the pull rods. It is characterized in that a mounting seat is fixedly connected to the chuck body by fasteners, the pull rod is slidably arranged in the mounting seat, the three rocker rods are hinged on the mounting seat, the inner end of each rocker rod extends into the mounting seat and is connected to the pull rod, and the outer end of each rocker rod is respectively connected to the corresponding slider.

[0007] The driving method of this chuck is the same as that in the background technology, which is also directly driven by the piston rod of the driving cylinder to drive the pull rod to move axially, and the pull rod drives the three rocker rods to swing to pull the three sliders closer to or apart from each other (when in use, clamping claws will be fixed on each slider). In this chuck, a mounting seat is fixedly connected to the chuck body, the pull rod is slidably set in the mounting seat and the three rocker rods are respectively hinged on the mounting seat, and the inner ends of the three rocker rods are all extended into the mounting seat and connected to the pull rod, that is, the mounting seat, the pull rod and the three rocker rods constitute an assembly, so that when the chuck body needs to be replaced, the staff can directly remove the entire assembly from the chuck body, and then directly install the entire assembly into the new chuck body through fasteners, without the need to remove and reinstall the rocker rod and the pull rod, which greatly improves the convenience of replacing the chuck body.

[0008] In the above-mentioned chuck, the mounting seat is provided with a guide hole along the axial direction of the pull rod, the pull rod is located in the guide hole, the side of the mounting seat is provided with three notch grooves, the three notch grooves are all connected to the guide hole, and the three rocker arms are respectively located in each notch groove.

[0009] The notch groove provides a position for the hinge of the swing rod on the mounting seat. At the same time, the notch groove is connected with the guide hole, which ensures that the inner end of each swing rod can be connected to the pull rod.

[0010] In the above-mentioned chuck, ears are formed on both sides of each notch groove on the side of the mounting seat, the rocker arm is hinged in the notch groove through a pin shaft, and both ends of the pin shaft are interference-fitted in the ears on both sides of the notch groove, and any one of the two ears corresponding to the same notch groove is threadedly connected with a locking screw, which is laterally tightened on the pin shaft.

[0011] Put the swing rod in the notch, and then pass the pin through to hinge the swing rod and the mounting seat together. After the hinge is completed, screw the locking screw on the ear, and the locking screw will press against the pin sideways to lock the pin, so as to improve the firmness of the swing rod hinged on the mounting seat.

[0012] In the above-mentioned chuck, the rear end of the chuck body has a through hole, the rear end of the pull rod has a connector located in the through hole, the connector is threadedly connected to the end of the piston rod of the driving cylinder, and the front end opening of the through hole is expanded.

[0013] By setting the front end opening of the through hole in a flared shape, the flared shape can make way for each swing rod when the piston rod of the driving cylinder drives the pull rod to move backward, so that the swing angle of the swing rod can be larger. The pull rod moves backward to achieve the action of three mutually approaching to clamp the workpiece, so the larger the swing angle of the swing rod means the greater distance the three claws slide toward the center line of the chuck body.

[0014] In the above-mentioned chuck, the rocker arm is L-shaped, the hinge position of the rocker arm is its bending point, the two ends of the rocker arm respectively have spherical heads, the side of the pull rod has an annular matching groove, the spherical heads located at the inner end of each rocker arm are inserted into the annular matching groove, the rear end face of each slider has a slot, and the spherical heads located at the outer end of each rocker arm are respectively inserted into the slots of each slider.

[0015] The spherical heads at the inner ends of the swing rods are inserted into the annular matching grooves, and the spherical heads at the outer ends of the swing rods are respectively inserted into the slots of the sliders, and the hinged position of the swing rods is the bending position thereof, so that the linear movement of the piston rod of the driving cylinder can be converted into the radial movement of the slider along the chuck body through the swing rods. Moreover, because the annular matching groove is annular, it is more convenient to assemble the swing rods and the pull rods. The setting of the spherical heads makes it smoother for the pull rods to drive the swing rods and for the swing rods to drive the sliders, without getting stuck.

[0016] In the above-mentioned chuck, the chuck body includes a bottom shell with a concave cavity at the front end and a top cover fixedly connected to the front end of the bottom shell, the front end of the top cover is radially provided with three slide grooves, three sliders are respectively slidably arranged in the three slide grooves, and the rear end of the top cover is radially provided with three give-way grooves, the three give-way grooves correspond to the three slide grooves one by one, the give-way grooves are parallel to the corresponding slide grooves and the two are connected, and the outer end of each rocker rod passes through the corresponding give-way groove.

[0017] Compared with the prior art, the chuck is fixedly connected to the mounting seat in the chuck body, the pull rod is slidably set in the mounting seat and the three rocker arms are respectively hinged on the mounting seat, the inner ends of the three rocker arms are all extended into the mounting seat and connected to the pull rod, so that the mounting seat, the pull rod and the three rocker arms constitute an assembly. In this way, when the chuck body needs to be replaced, the staff can directly remove the entire assembly from the chuck body, and then directly install the entire assembly into the new chuck body through fasteners, without the need to remove and reinstall the rocker arm and the pull rod, which greatly improves the convenience of replacing the chuck body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a three-dimensional schematic diagram of this chuck.

[0019] Figure 2 It is a front plane schematic diagram of the chuck.

[0020] Figure 3 yes Figure 2 Sectional view along AA direction.

[0021] Figure 4 It is a three-dimensional schematic diagram of the mounting seat, pull rod and swing rod in the chuck.

[0022] Figure 5 It is a three-dimensional schematic diagram of the mounting seat in this chuck.

[0023] In the figure, 1, chuck body; 1a, bottom shell; 1a1, through hole; 1b, top cover; 1b1, give way groove; 1b2, oil filling hole; 2, driving cylinder; 2a, cylinder body; 2b, piston rod; 3, pull rod; 3a, annular matching groove; 3b, connector; 4, slider; 4a, slot; 5, rocker arm; 5a, spherical head; 6, mounting seat; 6a, guide hole; 6b, notch groove; 6c, ear; 7, pin; 8, locking screw. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the chuck comprises a chuck body 1 with a cavity inside and a driving cylinder 2 connected to the rear end of the chuck body 1. The cylinder body 2a of the driving cylinder 2 is fixedly connected to the rear end of the chuck body 1 by a fastener, the piston rod 2b of the driving cylinder 2 extends into the chuck body 1 and is fixedly connected to the pull rod 3, the front end of the chuck body 1 is radially slidably connected to three sliders 4 (in actual use, the three sliders 4 are respectively fixedly connected with claws), and the three sliders 4 are respectively connected to the pull rod 3 with swing rods 5. When the pull rod 3 moves axially, the three sliders 4 can be driven to move closer to or away from each other through the swing rods 5 at the same time. The side of the chuck body 1 is provided with an oil filling hole 1b2 connected to the cavity inside it, and oil can be filled into the chuck body 1 through the oil filling hole 1b2 to achieve lubrication and maintenance of the pull rod 3 and the swing rods 5.

[0026] like Figure 3 , Figure 4 and Figure 5As shown, a mounting seat 6 is fixedly connected to the chuck body 1 by fasteners, the pull rod 3 is slidably arranged in the mounting seat 6 along its own axial direction, and three swing rods 5 are hinged on the mounting seat 6, the inner end of each swing rod 5 extends into the mounting seat 6 and is connected to the pull rod 3, and the outer end of each swing rod 5 is respectively connected to the corresponding slider 4. Specifically, the mounting seat 6 is provided with a guide hole 6a along the axial direction, the pull rod 3 is located in the guide hole 6a, and the side of the mounting seat 6 is provided with three notch grooves 6b, the three notch grooves 6b are all connected to the guide hole 6a, and the three swing rods 5 are respectively hinged in each notch groove 6b. In the present chuck, a mounting seat 6 is fixedly connected inside the chuck body 1, the pull rod 3 is slidably set inside the mounting seat 6 and three rocker arms 5 are respectively hinged on the mounting seat 6, the inner ends of the three rocker arms 5 are all extended into the mounting seat 6 and connected with the pull rod 3, that is to say, the mounting seat 6, the pull rod 3 and the three rocker arms 5 constitute an assembly, so that when the chuck body 1 needs to be replaced, the staff can directly remove the entire assembly from the chuck body 1, and then directly install the entire assembly into the new chuck body 1 through fasteners, without the need to remove and reinstall the rocker arms 5 and the pull rod 3, which greatly improves the convenience of replacing the chuck body 1. The side of the mounting seat 6 forms ears 6c on both sides of each notch 6b. The swing rod 5 is L-shaped. The hinge position of the swing rod 5 is its bending position. The swing rod 5 is hinged in the notch 6b through the pin 7. The two ends of the pin 7 are respectively set in the ears 6c on both sides of the notch 6b. Any one of the two ears 6c corresponding to the same notch 6b is threadedly connected with a locking screw 8, and the locking screw 8 is laterally tightened on the pin 7. The swing rod 5 is placed in the notch 6b, and then the pin 7 is passed through to hinge the swing rod 5 with the mounting seat 6. After the hinge is completed, the locking screw 8 is screwed on the ear 6c, and the locking screw 8 is laterally tightened on the pin 7 to achieve the locking of the pin 7, so as to improve the firmness of the swing rod 5 hinged on the mounting seat 6. In practice, the side of the pin 7 has a groove, and the end of the locking screw 8 is inserted into the groove.

[0027] like Figure 3As shown, in this embodiment, both ends of the swing rod 5 have spherical heads 5a respectively, and the side of the pull rod 3 has an annular matching groove 3a, and the spherical heads 5a located at the inner end of each swing rod 5 are inserted into the annular matching groove 3a. The chuck body 1 includes a bottom shell 1a with a concave cavity at the front end and a top cover 1b fixedly connected to the front end of the bottom shell 1a. The front end of the top cover 1b is provided with three slide grooves in the radial direction, and three sliders 4 are respectively slidably arranged in the three slide grooves. The rear end of the top cover 1b is provided with three clearance grooves 1b1 in the radial direction. The three clearance grooves 1b1 correspond to the three slide grooves one by one, and the clearance grooves 1b1 are parallel to the corresponding slide grooves and the two are connected. The rear end of each slider 4 has a clamping groove 4a, and the spherical head 5a located at the outer end of each swing rod 5 passes through the corresponding clearance groove 1b1 and is inserted into the clamping groove 4a of the corresponding slider 4. The oil filling hole 1b2 is also provided on the top cover 1b. Through the above arrangement, when the piston rod 2b of the driving cylinder 2 extends and drives the pull rod 3 to move forward, the pull rod 3 will drive the swing rods 5 to swing at the same time and drive the sliders 4 to separate from each other in the radial direction; when the piston rod 2b of the driving cylinder 2 retracts and drives the pull rod 3 to move backward, the pull rod 3 will drive the swing rods 5 to swing at the same time and drive the sliders 4 to approach each other in the radial direction. Among them, the arrangement of the spherical head 5a makes it smoother for the pull rod 3 to drive the swing rods 5 and for the swing rods 5 to drive the sliders 4, and there will be no jamming. The rear end of the chuck body 1 has a through hole 1a1, and the rear end of the pull rod 3 has a connector 3b located in the through hole 1a1. The connector 3b is threadedly connected to the end of the piston rod 2b of the driving cylinder 2. The front end of the through hole 1a1 is in a flared shape. The flared shape can make way for the swing rods 5 when the piston rod 2b of the driving cylinder 2 drives the pull rod 3 to move backward, so that the swing angle of the swing rod 5 can be larger. The pull rod 3 moves backward to realize the action of three claws approaching each other to clamp the workpiece. Therefore, a larger swing angle of the swing rod 5 means a larger distance that the three claws slide toward the center line of the chuck body 1.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A chuck, comprising a chuck body (1) having a cavity therein and a driving cylinder (2) connected to the rear end of the chuck body (1), wherein a piston rod (2b) of the driving cylinder (2) extends into the chuck body (1) and is fixedly connected to a pull rod (3), and the front end of the chuck body (1) is radially slidably connected to three sliders (4), and rocker rods (5) are respectively provided between the three sliders (4) and the pull rod (3), characterized in that: The chuck body (1) is fixedly connected to a mounting seat (6) via fasteners, the pull rod (3) is slidably arranged in the mounting seat (6), and three rocker arms (5) are hinged on the mounting seat (6). The inner end of each rocker arm (5) extends into the mounting seat (6) and is connected to the pull rod (3), and the outer end of each rocker arm (5) is respectively connected to the corresponding slider (4).

2. The chuck according to claim 1, characterized in that The mounting seat (6) is provided with a guide hole (6a) along the axial direction of the pull rod (3), the pull rod (3) is located in the guide hole (6a), and the side of the mounting seat (6) is provided with three notch grooves (6b), the three notch grooves (6b) are all connected to the guide hole (6a), and the three rocker arms (5) are respectively located in each notch groove (6b).

3. The chuck according to claim 2, characterized in that The side of the mounting seat (6) is provided with ears (6c) on both sides of each notch groove (6b), the swing arm (5) is hinged in the notch groove (6b) through a pin shaft (7), both ends of the pin shaft (7) are respectively interference-arranged in the ears (6c) on both sides of the notch groove (6b), any one of the two ears (6c) corresponding to the same notch groove (6b) is threadedly connected with a locking screw (8), and the locking screw (8) is laterally pressed against the pin shaft (7).

4. The chuck according to claim 3, characterized in that The rear end of the chuck body (1) has a through hole (1a1), the rear end of the pull rod (3) has a connector (3b) located in the through hole (1a1), the connector (3b) is threadedly connected to the end of the piston rod (2b) of the driving cylinder (2), and the front end opening of the through hole (1a1) is expanded.

5. The chuck according to claim 1, 2, 3 or 4, characterized in that: The swing rod (5) is L-shaped, the hinge position of the swing rod (5) is its bending position, the two ends of the swing rod (5) are respectively provided with spherical heads (5a), the side of the pull rod (3) is provided with an annular matching groove (3a), the spherical heads (5a) located at the inner end of each swing rod (5) are inserted into the annular matching groove (3a), the rear end surface of each slider (4) is provided with a slot (4a), and the spherical heads (5a) located at the outer end of each swing rod (5) are respectively inserted into the slot (4a) of each slider (4).

6. The chuck according to claim 5, characterized in that The chuck body (1) comprises a bottom shell (1a) having a concave cavity at the front end and a top cover (1b) fixedly connected to the front end of the bottom shell (1a). The front end of the top cover (1b) is provided with three sliding grooves in the radial direction. Three sliders (4) are respectively slidably arranged in the three sliding grooves. The rear end of the top cover (1b) is provided with three giving way grooves (1b1) in the radial direction. The three giving way grooves (1b1) correspond to the three sliding grooves one by one. The giving way grooves (1b1) are parallel to the corresponding sliding grooves and the two are connected. The outer end of each swing rod (5) passes through the corresponding giving way groove (1b1).

Images