Self-adjusting fixture for numerical control machining lathe

Abstract

The application relates to a self-adjusting clamp for a numerical control machining lathe, which comprises a workpiece placing table, eight clamps are arranged in a circumferential array on the top of the workpiece placing table around the center of the workpiece placing table, and reinforcing assemblies are arranged on the two sides of the clamps. The application relates to the technical field of numerical control machining clamps. When the clamp is used for clamping an irregularly-shaped workpiece, eight clamps can provide eight-direction clamping forces for the workpiece, and the eight clamps can be driven to move towards the outer circumferential surface of the workpiece through a synchronous driving assembly. Since the irregularly-shaped workpiece has different distances between the outer circumferential surface and each clamp, the linkage effect of each clamp can be individually released through a clutch assembly, so that the eight clamps can keep the clamping state. The clamping force provided by the application is stable, the operation is convenient, the clamp is suitable for clamping workpieces with different shapes, and the application is suitable for promotion.

Description

Technical Field

[0001] This invention relates to the technical field of CNC machining fixtures, and in particular to a self-adjusting fixture for a CNC machining lathe. Background Technology

[0002] Numerical control (CNC) machining refers to a machining process that uses CNC machine tools to process parts. While the overall process specifications for CNC machining are consistent with those for traditional machine tool machining, significant differences have occurred. It is a machining method that uses digital information to control the movement of parts and tools. It is an effective way to solve problems such as diverse part types, small batch sizes, complex shapes, and high precision requirements, and to achieve efficient and automated machining. During CNC machining, fixtures are used to hold and fix the workpiece to meet the requirements of normal machining operations.

[0003] However, when machining irregularly shaped workpieces, the irregular clamping surface limits the contact area between the fixture and the workpiece, making it prone to slippage and difficult to achieve stable clamping. Therefore, it is necessary to propose a self-adjusting fixture for CNC lathes to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a self-adjusting fixture for CNC machining lathes, which has the effect of stable clamping and is not easy to slip sideways.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A self-adjusting fixture for a CNC lathe includes a workpiece placement stage. Eight fixtures are arranged in a circumferential array around the center of the workpiece placement stage. Reinforcing components are provided on both sides of each fixture. Slide grooves are provided on the upper surface of the workpiece placement stage corresponding to the positions of each fixture. A slider is installed at the bottom of each fixture and is slidably connected to the slide groove. A drive cavity is provided inside the workpiece placement stage, and a synchronous drive component is provided in the drive cavity.

[0007] By adopting the above technical solution, this application uses eight clamps to clamp irregularly shaped workpieces. Each clamp, driven by the synchronous drive component, can maintain a tight fit with the outer side of the workpiece, so that the workpiece receives a relatively stable clamping force. At the same time, with the reinforcement component, the reinforcement plate and the clamp can be deflected at an angle, which increases the contact area and further enhances the clamping force.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the synchronous drive assembly includes a drive motor, the drive motor is fixedly installed at the middle position of the inner top wall of the drive cavity, the output shaft of the drive motor is fixedly connected to a drive gear, and eight driven gears are rotatably connected around the center of the drive gear in the drive cavity, the drive gear meshing with the driven gears;

[0009] A rack is slidably connected to each slider on the inner top wall of the drive cavity. The rack is fixedly connected to the slider. A drive gear is rotatably connected to the rack inside the drive cavity. The drive gear meshes with the rack. A drive shaft is fixedly connected to the middle of the drive gear. A drive shaft is fixedly connected to the middle of the driven gear. A transmission assembly is provided between the drive shaft and the drive shaft.

[0010] Through the above technical solution, the spur rack and drive gear cooperate to drive the slider to slide in the slide groove, thereby driving the fixture to move towards the workpiece. Since there are eight fixtures, by using the cooperation of the driving gear and the driven gear, and through the transmission component, the purpose of synchronously driving each fixture can be achieved.

[0011] In a preferred embodiment, the present invention can be further configured as follows: the transmission assembly includes a drive rod one and a drive rod two, a clutch assembly is provided between the drive rod one and the drive rod, and a first bevel gear is fixedly connected to the opposite side of the drive rod one and the drive rod two, and a second bevel gear is fixedly connected to the bottom end of the transmission shaft one and the transmission shaft two, wherein the first bevel gear meshes with the second bevel gear;

[0012] The inner bottom wall of the drive cavity is equipped with a support frame corresponding to the positions of each drive rod one and drive rod two. The drive rod one and drive rod two are rotatably connected to the support frame at the corresponding positions through bearings.

[0013] Through the above technical solution, the second drive shaft rotates, and through the cooperation of the first bevel gear and the second bevel gear, it can drive the first drive rod and the second drive rod to rotate, thereby driving the first drive shaft to rotate, which in turn drives the drive gear to rotate, thus achieving the purpose of driving the fixture.

[0014] In a preferred embodiment, the present invention can be further configured as follows: the clutch assembly includes an insertion rod installed at the end of the drive rod one away from the first bevel gear; an insertion groove is formed at the end of the drive rod two corresponding to the position of the insertion rod; the insertion rod is rotatably connected in the insertion groove; four mounting grooves are evenly formed along the circumferential direction of the insertion groove; a spring and a clutch rod are fixedly connected inside the mounting groove; a clutch groove is formed on the circumferential side of the insertion rod corresponding to the position of the clutch rod; the clutch rod is inserted into the clutch groove; and the clutch groove is an arc-shaped groove, with the end of the clutch rod being arc-shaped.

[0015] By adopting the above technical solution, when the drive rod one rotates, the clutch rod is always in the clutch groove under the action of the spring, so the drive rod one and the drive rod two can rotate synchronously. When the fixture reaches the position of the workpiece and is in contact with the outer peripheral surface of the workpiece, the fixture cannot continue to move forward. At this time, the clutch rod will rotate out of the clutch groove, the spring will contract, the drive rod one and the drive rod two will be in a disengaged state, and the fixture will stop moving forward. Thus, the purpose of the eight fixtures being able to move forward synchronously and disengage from each other can be achieved, so as to meet the purpose of clamping workpieces of different shapes.

[0016] In a preferred embodiment, the present invention may be further configured such that: the reinforcement component includes a reinforcement plate, the reinforcement plate is rotatably connected to the side of the clamp, a first connecting rod is hinged to the rear side of the reinforcement plate, a second connecting rod is hinged to the rear side of the clamp, the first connecting rod and the second connecting rod are hinged together, and a return spring is installed on one side of the second connecting rod and the extension of the clamp.

[0017] By adopting the above technical solution, the reinforcing plate and the clamp can be deflected at an angle, which increases the contact area and thus further enhances the clamping force.

[0018] In summary, the present invention has at least one of the following beneficial technical effects:

[0019] 1. When clamping irregularly shaped workpieces, this application utilizes eight clamps to provide clamping force in eight directions. The synchronous drive assembly can drive all eight clamps to move towards the outer circumferential surface of the workpiece. Due to the irregular shape of the workpiece, the distance between the outer circumferential surface of the workpiece and each clamp is different. At this time, the clutch assembly can individually release the linkage effect of each clamp, so that all eight clamps can maintain a clamping state. The clamping force provided by this application is stable and easy to operate. It is suitable for clamping workpieces of different shapes and is suitable for promotion.

[0020] 2. This application provides reinforcing components on both sides of the fixture. Due to the action of the return spring, there is a certain deflection angle between the reinforcing plate and the fixture. This allows for further clamping of curved surfaces or other surfaces with a certain angle on the workpiece, increasing the clamping area and thus increasing the clamping stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this embodiment.

[0022] Figure 2 This is a schematic diagram of the internal structure of the drive cavity in this embodiment.

[0023] Figure 3 This is a schematic diagram of the clutch assembly structure in this embodiment.

[0024] Figure 4 This is a schematic diagram of the clutch groove structure in this embodiment.

[0025] Figure 5 This is the embodiment Figure 1 Enlarged view of part A.

[0026] In the diagram, 1 is the workpiece placement platform, 2 is the fixture, 3 is the reinforcement assembly, 4 is the slide, 5 is the slider, 6 is the drive cavity, 7 is the synchronous drive assembly, 71 is the drive motor, 72 is the driving gear, 73 is the driven gear, 74 is the spur rack, 75 is the drive gear, 76 is the first transmission shaft, 77 is the second transmission shaft, 78 is the transmission assembly, 781 is the first drive rod, 782 is the second drive rod, 783 is the clutch assembly, 784 is the first bevel gear, 785 is the second bevel gear, 786 is the support frame, 7831 is the insertion rod, 7832 is the insertion slot, 7833 is the mounting slot, 7834 is the spring, 7835 is the clutch rod, 7836 is the clutch slot, 31 is the reinforcement plate, 32 is the first connecting rod, 33 is the second connecting rod, and 34 is the return spring. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example:

[0029] Reference Figure 1-5 As shown, the present invention discloses a self-adjusting fixture for a CNC machining lathe, including a workpiece placement table 1. Eight fixtures 2 are arranged in a circular array around the center of the workpiece placement table 1 on the top circumference of the workpiece placement table 1. Reinforcing components 3 are provided on both sides of each fixture 2. Slide grooves 4 are provided on the upper surface of the workpiece placement table 1 corresponding to the positions of each fixture 2. A slider 5 is installed at the bottom of the fixture 2 and is slidably connected in the slide groove 4. A drive cavity 6 is provided inside the workpiece placement table 1, and a synchronous drive component 7 is provided in the drive cavity 6.

[0030] Based on this, in the specific implementation process of this application, the workpiece is placed on the top of the workpiece placement table 1. The eight clamps can provide clamping force in eight directions on the workpiece. Specifically, when the synchronous drive component 7 works, it will give the clamp 2 a driving force, so that the slider 5 slides in the slide groove 4 and the clamp 2 moves towards the workpiece. At the same time, the reinforcement component 3 can increase the contact area between the clamp 2 and the workpiece, further enhance the clamping effect, and make the clamp less prone to side slip and maintain stability.

[0031] Reference Figure 1-4 As shown, the synchronous drive assembly 7 includes a drive motor 71, which is fixedly installed at the middle position of the inner top wall of the drive cavity 6. The output shaft of the drive motor 71 is fixedly connected to a drive gear 72. Eight driven gears 73 are also rotatably connected around the center of the drive gear 72 inside the drive cavity 6. The drive gear 72 meshes with the driven gears 73. A rack 74 is slidably connected to each slider 5 on the inner top wall of the drive cavity 6. The rack 74 is fixedly connected to the slider 5. A drive gear 75 is also rotatably connected to the rack 74 inside the drive cavity 6. The drive gear 75 meshes with the rack 74. A transmission shaft 76 is fixedly connected to the middle of the drive gear 75. A transmission shaft 77 is fixedly connected to the middle of the driven gear 73. A transmission assembly 78 is provided between the transmission shaft 76 and the transmission shaft 77. The transmission assembly 78 includes a first drive rod 781 and a second drive rod 782. A clutch assembly 783 is provided between the first drive rod 781 and the second drive rod 782. A first bevel gear 784 is fixedly connected to the opposite side of the first drive rod 781 and the second drive rod 782. A second bevel gear 785 is fixedly connected to the bottom end of the first drive shaft 76 and the second drive shaft 77. The first bevel gear 784 and the second bevel gear 785 mesh. A support frame 786 is installed on the inner bottom wall of the drive cavity 6 at the positions corresponding to each first drive rod 781 and the second drive rod 782. The first drive rod 781 and the second drive rod 782 are rotatably connected to the support frame 786 at the corresponding positions through bearings.

[0032] Based on this, in the specific implementation process, the synchronous drive assembly 7 utilizes the cooperation between the driving gear 72 and the driven gear 73 so that when the drive motor 71 drives the driving gear 72 to rotate, the eight driven gears 73 also rotate, thus each fixture 2 can obtain a driving force. Specifically, the rotation of the driven gear 73 drives the transmission shaft 77 to rotate, and the cooperation between the first bevel gear 784 and the second bevel gear 785 drives the drive rod 781 to rotate. At this time, the clutch assembly 783 is in the connected state, that is, the drive rod 781 can drive the drive rod 782 to rotate, thereby driving the transmission shaft 76 to rotate. The drive gear 75 rotates, and the cooperation between the drive gear 75 and the rack 74 drives the slider 5 to slide in the slide groove 4, thereby driving the fixture 2 to move towards the workpiece.

[0033] Reference Figure 2-4 As shown, the clutch assembly 783 includes an insertion rod 7831 installed at the end of the drive rod 781 away from the first bevel gear 784. The end of the drive rod 782 is provided with an insertion groove 7832 corresponding to the position of the insertion rod 7831. The insertion rod 7831 is rotatably connected in the insertion groove 7832. Four mounting grooves 7833 are evenly provided along the circumference of the insertion groove 7832. A spring 7834 and a clutch rod 7835 are fixedly connected inside the mounting groove 7833. A clutch groove 7836 is provided on the circumferential side of the insertion rod 7831 corresponding to the position of the clutch rod 7835. The clutch rod 7835 is inserted into the clutch groove 7836, and the clutch groove 7836 is an arc-shaped groove. The end of the clutch rod 7835 is arc-shaped.

[0034] Based on this, in the specific implementation process, when one of the clamps 2 is in contact with the outer peripheral surface of the workpiece, the clamp 2 will generate a resisting force, forcing the transmission assembly 78 to stop working. At this time, the elastic potential energy of the spring 7834 will be overcome, so that the spring 7834 is in a compressed state. In this way, the clutch rod 7835 will move. Specifically, the clutch rod 7835 will disengage from the clutch groove 7836, and then the insertion rod 7831 will rotate in the insertion groove 7832. The clutch assembly 783 is in a disengaged state, and the rotation of the first drive rod 781 will no longer drive the second drive rod 782 to rotate. Thus, each clamp 2 can be tightly attached to the outer peripheral surface of the workpiece, achieving the purpose of rapid clamping.

[0035] Reference Figure 1 and Figure 5 As shown, the reinforcement assembly 3 includes a reinforcement plate 31, which is rotatably connected to the side of the clamp 2. A connecting rod 32 is hinged to the rear side of the reinforcement plate 31, and a connecting rod 33 is hinged to the rear side of the clamp 2. The connecting rod 32 and the connecting rod 33 are hinged together. A return spring 34 is installed on one side of the connecting rod 33 and the extension of the clamp 2. When the clamp 2 is in close contact with the workpiece, the return spring 34 will exert a force on the reinforcement plate 31, causing the reinforcement plate 31 to also be in close contact with the outer side of the workpiece. This method can increase the clamping surface of the clamp 2 and further enhance the clamping stability.

[0036] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A self-adjusting fixture for CNC machining lathe, comprising a workpiece placement table (1), characterized in that: Eight clamps (2) are arranged in a circular array around the center of the workpiece placement platform (1) on the top circumference of the workpiece placement platform (1). Reinforcing components (3) are provided on both sides of each clamp (2). Slide grooves (4) are provided on the upper surface of the workpiece placement platform (1) corresponding to the positions of each clamp (2). (2) is equipped with a slider (5) at the bottom, and the slider (5) is slidably connected in the groove (4). A drive cavity (6) is provided inside the workpiece placement stage (1), and a synchronous drive assembly (7) is provided inside the drive cavity (6). The synchronous drive assembly (7) includes a drive motor (71), which is fixedly installed at the middle position of the inner top wall of the drive cavity (6). The output shaft of the drive motor (71) is fixedly connected to a drive gear (72). Eight driven gears (73) are also rotatably connected around the center of the drive gear (72) in the drive cavity (6). The drive gear (72) meshes with the driven gears (73). A rack (74) is slidably connected to each slider (5) on the inner top wall of the drive cavity (6). The rack (74) is fixedly connected to the slider (5). A drive gear (75) is rotatably connected to the rack (74) inside the drive cavity (6). The drive gear (75) meshes with the rack (74). A drive shaft (76) is fixedly connected to the middle of the drive gear (75). A drive shaft (77) is fixedly connected to the middle of the driven gear (73). A transmission assembly (78) is provided between the drive shaft (76) and the drive shaft (77). The transmission assembly (78) includes a drive rod one (781) and a drive rod two (782). A clutch assembly (783) is provided between the drive rod one (781) and the drive rod two (782). A first bevel gear (784) is fixedly connected to the opposite side of the drive rod one (781) and the drive rod two (782). A second bevel gear (785) is fixedly connected to the bottom end of the transmission shaft one (76) and the transmission shaft two (77). The first bevel gear (784) and the second bevel gear (785) mesh. The inner bottom wall of the drive cavity (6) is equipped with a support frame (786) corresponding to the positions of each drive rod one (781) and drive rod two (782). The drive rod one (781) and drive rod two (782) are rotatably connected to the support frame (786) at the corresponding positions through bearings.

2. A self-adjusting fixture for CNC machining lathe as claimed in claim 1, wherein: The clutch assembly (783) includes an insertion rod (7831) installed at the end of the drive rod (781) away from the first bevel gear (784). The end of the drive rod (782) is provided with an insertion groove (7832) corresponding to the position of the insertion rod (7831). The insertion rod (7831) is rotatably connected in the insertion groove (7832). Four mounting grooves (7833) are evenly provided along the circumferential direction of the insertion groove (7832). A spring (7834) and a clutch rod (7835) are fixedly connected inside the mounting groove (7833). A clutch groove (7836) is provided on the circumferential side of the insertion rod (7831) corresponding to the position of the clutch rod (7835). The clutch rod (7835) is inserted into the clutch groove (7836), and the clutch groove (7836) is an arc-shaped groove. The end of the clutch rod (7835) is arc-shaped.

3. The self-adjusting fixture for a CNC lathe according to claim 1, characterized in that: The reinforcement component (3) includes a reinforcement plate (31), which is rotatably connected to the side of the clamp (2). A connecting rod (32) is hinged to the rear side of the reinforcement plate (31), and a connecting rod (33) is hinged to the rear side of the clamp (2). The connecting rod (32) and the connecting rod (33) are hinged together. A return spring (34) is installed on one side of the connecting rod (33) and the extension of the clamp (2).

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