Adjustable PCB milling fixture

Abstract

The utility model discloses an adjustable PCB mill -out clamp relates to mill -out clamp, including step screw rod sliding table module, including fixed part and with parallel distribution's drag table, the movable arm is rotationally arranged on the fixed part, the first axle is connected with the sidewall screw connection of movable arm opposite two sides, and the second axle is connected with the sidewall screw connection of first axle and fixed part between setting up the tension spring, the tension spring default state makes the fixed installation of movable arm end portion silica gel soft pad block and resist on drag table upper surface to keep the horizontal state. The utility model can adapt to different size PCB, and clamping is stable without vibration, and the operation is laborsaving and can effectively protect the board surface.

Description

Technical Field

[0001] This utility model relates to a milling fixture, specifically an adjustable PCB milling fixture. Background Technology

[0002] PCB milling, also known as PCB CNC milling or mechanical milling, refers to the final stage of printed circuit board manufacturing. It involves using a precision CNC milling machine with a high-speed rotating carbide end mill to cut along a pre-defined path (usually the outline of the PCB, internal slots, or irregular holes) to separate multiple PCB units from the entire production panel and form them into the final desired shape.

[0003] PCB milling fixtures are core auxiliary devices used by CNC milling machines to accurately position and firmly fix PCB production panels or single boards when machining PCB shapes. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable PCB milling fixture to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable PCB milling fixture, including a stepper screw slide module, including a fixed part and a drag table distributed parallel thereto, a movable arm is rotatably provided on the fixed part, the movable arm is threaded to the side walls on opposite sides and a first shaft is threaded to the side wall of the fixed part, and a tension spring is provided between the first shaft and the second shaft threaded to the side wall of the fixed part.

[0006] In its default state, the tension spring causes the silicone pad block fixedly installed at the end of the movable arm to abut against the upper surface of the drag platform to maintain a horizontal state.

[0007] Preferably, the movable arm is fixedly provided with a guide plate and also includes a rotatable swing block, one side of which is a wedge surface, and the guide plate is slidably connected to the wedge surface.

[0008] Preferably, the device also includes a damping rod, the output end of which abuts against a protrusion fixedly provided on one side of the swing block;

[0009] The wedge-shaped surface has a high position and a low position, and the movable arm in a horizontal state has its guide plate distributed in the low position.

[0010] Preferably, the fixing part has a through hole and also includes a plug rod and a screw threaded to the end of the plug rod to form a guide rod;

[0011] The guide rod is slidably disposed within the perforation;

[0012] The insertion rod is provided with an end cap at one end located outside the fixing part, and an equidistant spring is fixedly provided between the end cap and the fixing part.

[0013] Preferably, a synchronizing rod is threaded onto the movable arm, and the end of the synchronizing rod is located in a groove on the insert rod.

[0014] Preferably, the system also includes a substrate, and the fixing part and the drag table are both fixedly mounted on the substrate.

[0015] Preferably, one of the substrates is fixedly mounted on the slide rail of the stepper screw slide module, while the other substrate is fixedly mounted on the slide of the stepper screw slide module, with the two slides being distributed adjacent to each other.

[0016] In the above technical solution, the adjustable PCB milling fixture provided by this utility model has the following beneficial effects: the movable arm is flipped so that it moves away from the table, and the tension spring is stretched and deformed during the process. Then the workpiece to be clamped is placed on the table, and then the tension spring returns to its default state, the movable arm returns to a horizontal state, and the rubber pad is pressed against the surface of the workpiece to be clamped for fixation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure of the PCB milling fixture provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the swing block and guide plate provided in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the insertion rod and screw provided in the embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Stepper screw slide module; 2. Fixing part; 21. Second shaft; 3. Slide table; 4. Movable arm; 41. First shaft; 42. Guide plate; 43. Silicone pad block; 5. Tension spring; 6. Swing block; 61. Wedge surface; 62. Protrusion; 7. Damping top rod; 80. Insert rod; 801. Waist groove; 81. Screw; 83. Equidistant spring; 9. Synchronizing rod; 10. Base plate. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Please see Figure 1-4 This utility model provides a technical solution: an adjustable PCB milling fixture mainly consists of core components such as a fixed part 2, a drag table 3, a movable arm 4, a tension spring 5, and a stepper screw slide module 1.

[0026] The fixed part 2 and the sliding table 3 are distributed in parallel. Both are preferably fixedly mounted on an external worktable or slide module via a base plate 10 to ensure the stability of the overall structure. The movable arm 4 is rotatably mounted on the upper part of the fixed part 2 via a pivot, allowing it to rotate around the pivot in a vertical plane. A silicone pad 43 is fixedly mounted on the lower surface of the movable arm 4 near its free end (i.e., the end away from the pivot). This pad is used to directly contact and press against the PCB board, and its silicone material provides sufficient friction and prevents scratches on the board surface.

[0027] To achieve automatic reset and stable holding of the movable arm 4, a first shaft 41 is threadedly connected to the side walls on opposite sides of the movable arm 4, and a second shaft 21 is threadedly connected to the corresponding side wall of the fixed part 2. A tension spring 5 connects the first shaft 41 and the second shaft 21. Under the default tension of the tension spring 5, the movable arm 4 is pulled downward, causing the silicone pad 43 at its end to press tightly against the upper surface of the tray 3. At this time, the movable arm 4 remains horizontal, providing a stable and horizontal pre-compression surface for placing the PCB board.

[0028] A key application of this fixture is its use in pairs with the stepper screw slide module 1 to achieve width adjustment. Specifically, two identical fixture units are installed: the base plate 10 of one fixture is fixedly mounted on the slide rail of the stepper screw slide module 1 as the fixed side; the base plate 10 of the other fixture is fixedly mounted on the slide of the stepper screw slide module 1 as the movable side. The drag tables 3 of the two fixtures are distributed adjacent to each other. When the stepper motor of the stepper screw slide module 1 drives the screw to rotate, the slide will move precisely along the slide rail, thereby driving the movable side fixture to move synchronously, realizing continuous and precise adjustment of the distance between the two drag tables 3. During operation, simply place the PCB board on the two drag tables 3, then lift the two movable arms 4 respectively, placing the PCB board under the silicone pad block 43. After releasing, the movable arms 4 automatically press the edge of the PCB board under the action of the tension spring 5. By controlling the movement of the slide, the fixture spacing can be adjusted to accommodate PCB boards of different widths, achieving universal clamping.

[0029] Example 2

[0030] Based on Embodiment 1, this embodiment further adds a damping control and reset assist mechanism for the flipping process of the movable arm 4, aiming to improve the smoothness of operation, safety and final stability of clamping.

[0031] like Figure 2 and Figure 3 As shown, in this embodiment, a guide plate 42 (or slider) is fixedly mounted on the movable arm 4. Simultaneously, a swing block 6 is rotatably mounted on the fixed part 2 or the base plate 10 via a rotating shaft. One side of the swing block 6 is machined into a specific wedge surface 61, which has a high position and a low position, forming an inclined slide. The end of the guide plate 42 maintains a sliding connection with the wedge surface 61.

[0032] Its working principle is as follows: In the default horizontal state, the guide plate 42 on the movable arm 4 is exactly at the low position of the wedge surface 61. When the movable arm 4 is manually flipped upward to place the PCB board, the guide plate 42 will slide along the wedge surface 61 from the low position to the high position. Since the wedge surface is inclined, this sliding process will force the swing block 6 to deflect around its axis of rotation, that is, its whole body will swing away from the movable arm 4.

[0033] To provide controllable resistance to the deflection of the swing block 6 and to provide power for resetting, a damping rod 7 is added in this embodiment. The cylinder of the damping rod 7 (which can be a gas damping rod or a hydraulic damping rod) is fixed to the base plate 10, and the end of its output rod (piston rod) always abuts against the protrusion 62 fixedly provided on one side of the swing block 6. When the movable arm 4 is raised, causing the swing block 6 to deflect, the protrusion 62 will press against the output end of the damping rod 7, forcing it to slowly contract. The damping force generated in this process makes the lifting of the movable arm smooth and controllable, without a sudden bounce.

[0034] When the movable arm 4 is released, the energy stored inside the compressed damping rod 7 (which consists of a piston cylinder, a movable rod slidably disposed within the piston cylinder, and a retaining spring fixed between the movable rod and the piston cylinder) pushes its output end to return to its original position. The output end pushes against the protrusion 62, driving the swing block 6 to deflect back to its original position. The return action of the swing block 6 pushes the guide plate 42 through the wedge surface 61, thereby providing an auxiliary downward pressing and restoring force for the movable arm 4. Together with the tension spring 5, this ensures that the movable arm 4 can quickly and reliably return to the horizontal clamping state, and that the guide plate 42 is re-stabilized in the low position of the wedge surface 61. This design significantly avoids the impact or vibration that may occur when the movable arm 4 is released due to the action of the tension spring 5 alone, improving the smoothness and precision of the clamping action.

[0035] Example 3

[0036] Based on Embodiment 1 or 2, this embodiment introduces a linkage damping enhancement mechanism, which aims to dynamically change the damping force of the movable arm 4 during the flipping and clamping process, thereby providing a greater locking force during final clamping and further enhancing clamping reliability.

[0037] like Figure 3 and Figure 4 As shown, in this embodiment, a through hole is formed in the fixing part 2. A set of guide rod assembly is slidably disposed in the through hole. The guide rod assembly consists of a plug rod 80 and a screw rod 81, with the screw rod 81 threadedly connected to the end of the plug rod 80. Together, they form an adjustable length unit. The plug rod 80 has an end cap on one end located outside the fixing part 2, and an equidistant spring 83 is sleeved between the end cap and the outer wall of the fixing part 2. Under normal conditions, the equidistant spring 83 is in a slightly compressed or free state.

[0038] To achieve motion linkage between the movable arm 4 and the guide rod assembly, a synchronizing rod 9 is threaded onto the movable arm 4. The end of the synchronizing rod 9 extends into a slot 801 on the insert rod 80. The slot 801 is an elongated oval hole, providing the necessary movement space for the end of the synchronizing rod 9.

[0039] The linkage process is as follows: When the movable arm 4 is in a horizontal (pressed) state, the end of the synchronizing rod 9 is located at the end of the waist groove 801 near the fixed part 2. When the operator flips the movable arm 4 upward, the movable arm 4 drives the synchronizing rod 9 to move. After sliding a certain distance within the waist groove 801, the end of the synchronizing rod 9 contacts the end of the waist groove 801, and then begins to push the entire guide rod assembly (insertion rod 80 and screw 81) to slide towards the drag table 3 (i.e., the right side in the figure). This sliding process significantly compresses the equidistant spring 83.

[0040] The reaction force generated by the compression of the equidistant spring 83 is transmitted to the movable arm 4 through the guide rod assembly and the synchronizing rod 9, and is converted into an additional damping torque that hinders the rotation of the movable arm 4. This means that the greater the rotation angle of the movable arm 4, the more the equidistant spring 83 is compressed, the greater the required operating force, and the heavier the clamping "feel". When the operator releases the grip, the movable arm 4 returns to its original position and presses down under the action of the tension spring 5 (and the damping top rod 7 in Embodiment 2). At this time, the compressed equidistant spring 83 releases energy, and its restoring force applies an additional auxiliary force to the movable arm 4 in the same direction as the clamping direction through the synchronizing rod 9. This auxiliary force is superimposed with the tension of the tension spring, so that the movable arm 4 can generate a larger, dynamically increasing clamping force at the moment of final closing and clamping the PCB board, thereby realizing the function of "enhanced clamping effect", which is particularly suitable for processing scenarios of thick plates or rigid plates that require higher clamping stability.

[0041] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An adjustable PCB milling fixture, comprising a stepper screw slide module (1), characterized in that, It includes a fixed part (2) and a platform (3) distributed parallel to it. A movable arm (4) is rotatably provided on the fixed part (2). The movable arm (4) is threadedly connected to the side walls on both sides of the first shaft (41). A tension spring (5) is provided between the first shaft (41) and the second shaft (21) threadedly connected to the side wall of the fixed part (2). In its default state, the tension spring (5) causes the silicone pad (43) fixedly installed at the end of the movable arm (4) to abut against the upper surface of the drag table (3) to maintain a horizontal state.

2. The adjustable PCB milling fixture according to claim 1, characterized in that, The movable arm (4) is fixedly provided with a guide plate (42) and also includes a rotatable swing block (6). One side of the swing block (6) is a wedge surface (61), and the guide plate (42) is slidably connected to the wedge surface (61).

3. An adjustable PCB milling fixture according to claim 2, characterized in that, It also includes a damping rod (7), the output end of which abuts against a protrusion (62) fixedly provided on one side of the swing block (6); The wedge (61) has a high position and a low position, and the movable arm (4) in the horizontal state has its guide plate (42) distributed in the low position.

4. The adjustable PCB milling fixture according to claim 1, characterized in that, The fixing part (2) is provided with a through hole, and also includes a plug rod (80) and a screw rod (81) threaded to the end of the plug rod (80) to form a guide rod; The guide rod is slidably disposed within the perforation; The insertion rod (80) is provided with an end cap at one end located outside the fixing part (2), and an equidistant spring (83) is fixedly provided between the end cap and the fixing part (2).

5. An adjustable PCB milling fixture according to claim 4, characterized in that, A synchronizing rod (9) is threaded onto the movable arm (4), and the end of the synchronizing rod (9) is located in the waist groove (801) opened on the insert rod (80).

6. An adjustable PCB milling fixture according to claim 1, characterized in that, It also includes a substrate (10), and the fixing part (2) and the drag table (3) are both fixedly mounted on the substrate (10).

7. An adjustable PCB milling fixture according to claim 6, characterized in that, One of the substrates (10) is fixedly mounted on the slide rail of the stepper screw slide module (1). The other substrate (10) is fixedly mounted on the slide of the stepper screw slide module (1). The two trolleys (3) are distributed adjacent to each other.

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