A flexible clamping pin box for PCB forming machine

Abstract

This utility model relates to the technical field of printed circuit board (PCB) processing equipment, and in particular to an elastic clamping PIN box for a PCB forming machine, comprising a base, an intermediate layer, and a cover plate; the intermediate layer is made of a single piece of polyurethane (PU) board, with multiple through holes arrayed on its upper surface. The use of a single PU board intermediate layer completely avoids the problem of small pieces falling off and shifting, resulting in a stronger overall structure. Furthermore, the installation and replacement of individual intermediate layer components are very simple, reducing the cost and complexity of equipment maintenance. The radial straight groove structure within the through holes allows the hole walls to more easily undergo elastic deformation when squeezed by PIN pins, ensuring smooth insertion and firmly holding the PIN pins with uniform elastic recovery force, accommodating PIN pins of different diameters and providing more reliable fixation. Moreover, because the PIN pins are more stably fixed, minor vibrations that may occur during processing are reduced, thereby indirectly improving the drilling or forming positioning accuracy of the PCB board.

Description

Technical Field

[0001] This utility model relates to the field of printed circuit board (PCB) processing equipment technology, and in particular to an elastic clamping PIN box for PCB forming machines. Background Technology

[0002] In PCB drilling and forming machines, the PIN box is a key positioning component used to hold and fix PIN pins (also known as pins or positioning pins) of various specifications. Most existing common PIN boxes use a structure composed of multiple independent small elastic material blocks (such as PU blocks) arranged in the middle layer, with each small block having a single round hole to accommodate the PIN pin. Furthermore, the through holes used to fix the PIN pins are usually simple straight round hole structures.

[0003] However, the existing technology has significant shortcomings: First, the intermediate layer structure, composed of multiple independent small pieces, has poor overall integrity and is prone to displacement, detachment, or loss during use, making management and maintenance inconvenient and resulting in a short service life. Second, the simple round hole structure has poor adaptability to PIN pin diameters; too small a hole diameter leads to difficulty in insertion and removal and easy wear, while too large a hole diameter leads to insecure clamping, reduced positioning accuracy, and difficulty in providing stable and reliable clamping force for PIN pins of different specifications. Therefore, a new type of PIN box structure is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the prior art, this utility model is proposed.

[0006] Therefore, this utility model aims to solve the problems of unstable PIN pin fixation, easy displacement, and poor adaptability.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an elastic clamping PIN box for a PCB forming machine, comprising a base, the base being box-shaped and having an upwardly open receiving cavity; an intermediate layer, made of a single piece of polyurethane (PU) board, disposed in the receiving cavity, the shape of which matches the receiving cavity, the upper surface of the intermediate layer having an array of multiple through holes; and a cover plate, covering the opening of the base and fixing the intermediate layer inside the receiving cavity.

[0008] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the cross-sectional shape of the through hole is as follows: a circular hole is provided in the center, the diameter of which is smaller than the diameter of the PIN pin to be fixed; at least three small straight grooves are radially formed on the wall of the circular hole, the small straight grooves are connected to the circular hole, and the hole wall is divided into multiple independent elastic flaps.

[0009] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the upper entrance of the through hole is provided with a chamfer.

[0010] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the bottom wall of the base is provided with a plurality of lower through holes, the lower through holes are coaxially corresponding to the through holes, and the diameter of the lower through holes is larger than the diameter of the circular holes.

[0011] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the number of the small straight slots is three or four, and they are evenly distributed along the circumference of the circular hole.

[0012] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the cover plate is detachably connected to the base by fasteners.

[0013] As a preferred embodiment of the elastic clamping PIN box for PCB forming machine described in this utility model, the thickness of the intermediate layer is 20mm to 50mm.

[0014] The beneficial effects of this invention are as follows: The use of a single PU board interlayer completely eliminates the problem of small pieces falling off and shifting, resulting in a stronger overall structure. Under stress, the stress is distributed across the entire board rather than concentrated on a single small piece, thus greatly improving wear and tear resistance, extending service life. Furthermore, the individual interlayer components are very easy to install and replace, reducing equipment maintenance costs and complexity. The radial straight groove structure within the through-hole allows the hole wall to more easily undergo elastic deformation when squeezed by the PIN pin, ensuring smooth insertion and firmly holding the PIN pin with uniform elastic recovery force, accommodating PIN pins of different diameters and providing more reliable fixation. Moreover, because the PIN pins are more stably fixed, minor vibrations that may occur during processing are reduced, indirectly improving the drilling or forming positioning accuracy of the PCB board. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 This is a top view of the middle layer of this utility model. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0022] Example 1, referring to Figures 1-2 This is the first embodiment of the present invention. This embodiment provides an elastic clamping PIN box for a PCB forming machine, including a base 1. The base 1 is box-shaped and has an upwardly open receiving cavity.

[0023] The base 1 is the supporting foundation for the entire PIN box. It is typically made of metal (such as aluminum alloy) or high-strength engineering plastic through milling or injection molding. The accommodating cavity is used to precisely accommodate and limit the intermediate layer 2. The side walls and bottom walls of the base 1 need to have sufficient strength and rigidity to withstand the vibration and impact during equipment operation.

[0024] The intermediate layer 2 is made of a single piece of polyurethane (PU) sheet and is placed in the cavity. Its shape matches the cavity. The upper surface of the intermediate layer 2 has multiple through holes 21 arrayed on it.

[0025] The intermediate layer 2 is the core innovative component of this utility model. The PU material possesses excellent elasticity, wear resistance, and tear resistance. The dimensions of the intermediate layer 2 are tightly fitted to the accommodating cavity of the base 1, allowing for easy placement without significant movement. Its key difference from existing technologies lies in its "one-piece molding," meaning it is a single, complete sheet material, rather than a collection of multiple small pieces. This fundamentally solves the management problem of multiple independent PU blocks easily shifting, falling off, or being lost, greatly improving the overall stability and service life of the structure. The through-hole 21 is used to support and fix the PIN pins.

[0026] Cover plate 3 covers the opening of base 1 and fixes intermediate layer 2 inside the accommodating cavity;

[0027] The cover plate 3 is usually made of the same material as the base 1 and acts as a "pressure plate". It covers the opening of the base 1 and its area is large enough to press down the entire edge of the intermediate layer 2, preventing the intermediate layer 2 from floating or shifting due to the insertion and extraction force of the PIN pins during operation. It is worth noting that holes should also be made on the top of the cover plate 3 to expose the through holes 21 on the intermediate layer 2.

[0028] During assembly, the entire intermediate layer 2 is first placed into the receiving cavity of the base 1, and then the cover plate 3 is closed and locked in place by the connector. In use, the spindle of the device presses down the PIN pin, inserting it into the through hole 21 of the intermediate layer 2, where it is elastically fixed. The integrated structure of the intermediate layer 2 ensures uniform force distribution and extremely high overall stability.

[0029] Example 2, refer to Figures 1-3 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0030] Specifically, the cross-sectional shape of the through hole 21 is as follows: a circular hole 212 is provided in the center, and the diameter of the circular hole 212 is smaller than the diameter of the PIN pin to be fixed.

[0031] It is worth noting that this is used to ensure the initial interference fit; for example, for a PIN pin with a diameter of 3.00 mm, d1 can be set to 2.98 mm.

[0032] Specifically, at least three small straight grooves 213 are radially provided on the wall of the circular hole 212. The small straight grooves 213 are connected to the circular hole 212 and divide the hole wall into multiple independent elastic flaps 214.

[0033] In traditional grooveless circular holes, the stress generated by inserting the PIN pin is concentrated within a complete annular area, easily leading to permanent plastic deformation or tearing of the PU material. The small straight groove 213 of this invention is designed with a stress-relieving path, dispersing the concentrated stress onto each individual elastic flap 214 and allowing the stress to dissipate more evenly into the surrounding PU material. This significantly reduces the risk of material fatigue and permanent damage, thereby extending the service life of the intermediate layer 2, while also making the insertion action easier and smoother.

[0034] Once inserted, the elasticity of the PU material creates a uniform and continuous centripetal clamping force on the valve walls, firmly securing the PIN pin like a "mechanical arm." This structure is highly accommodating to minute variations in PIN pin diameter, allowing it to accommodate a wider range of PIN pin specifications.

[0035] Specifically, a chamfer 211 is provided at the upper entrance of the through hole 21. The chamfer 211 can be a 45° chamfer or an arc-shaped guide opening.

[0036] The chamfer 211 forms a guide surface that can easily guide the tip of the PIN pin into the center of the through hole 21, avoiding collision between the tip of the PIN pin and the edge of the hole, making it difficult to align, or scratching and damaging the PU hole.

[0037] Specifically, the bottom wall of the base 1 has multiple lower through holes 11, which are coaxially corresponding to the through holes 21. The diameter of the lower through holes 11 is larger than the diameter of the round hole 212, which is used to provide clearance space for the tip of the PIN pin 4.

[0038] Specifically, the number of small straight grooves 213 is three or four, and they are evenly distributed along the circumference of the circular hole 212;

[0039] The uniformly distributed slots ensure the consistency of deformation and restoring force of each elastic flap 214, avoiding the risk of pushing the PIN pin away from the center position due to excessive force in one direction. This ensures that the clamped PIN pin always maintains high verticality and circumferential positioning accuracy, laying a solid foundation for the precise positioning of the PCB board. It is worth noting that in some scenarios with special requirements for clamping force, the number of small straight slots can also be five or six, as long as their circumferential distribution is ensured.

[0040] Specifically, the cover plate 3 is detachably connected to the base 1 by fasteners;

[0041] The specific implementation methods include, but are not limited to, screw connections and snap-fit ​​connections, with screw connections being the preferred option. This method of connection is reliable and can withstand frequent disassembly and assembly. The detachable connection makes maintenance and replacement of the intermediate layer 2 extremely convenient, greatly reducing the later maintenance costs and extending the service life of the PIN box body.

[0042] Specifically, the thickness of intermediate layer 2 is 20mm to 50mm;

[0043] If the thickness of the intermediate layer 2 is less than 20mm, the contact area between the PIN pin and the PU material is too small, resulting in insufficient clamping force. Furthermore, the stroke of the elastic valve wall 214 is short, making it prone to damage due to excessive deformation. If the thickness is greater than 50mm, it will lead to excessive insertion and extraction resistance, placing excessive demands on the downward pressure of the device spindle, and making the material cost uneconomical. This thickness range optimizes the insertion and extraction feel while ensuring sufficient clamping force and guide length, and guarantees the elastic valve wall 214 has the best service life and reliability.

[0044] During use, the through-hole 21, with its special structure (round hole 212 + straight groove 213 + chamfer 211), undergoes uniform elastic deformation of its elastic flap 21 when the PIN is inserted, achieving effortless insertion and strong clamping. The lower through-hole 11 at the bottom of the base 1 provides an unobstructed passage for the PIN. The entire intermediate layer 2, as a single unit, evenly distributes stress. When maintenance is required, the intermediate layer 2 can be replaced simply by removing the screws or opening the clips, achieving extremely high maintainability.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A resiliently clamped PIN cassette for a PCB forming machine, characterized by: include, The base (1) is box-shaped and has an upwardly open receiving cavity; The intermediate layer (2) is made of a single piece of polyurethane (PU) sheet and is placed in the cavity. Its shape matches the cavity. The upper surface of the intermediate layer (2) has multiple through holes (21). A cover plate (3) is placed over the opening of the base (1) and the intermediate layer (2) is fixed inside the accommodating cavity.

2. The elastic clamping PIN box for a PCB forming machine according to claim 1, wherein: The cross-sectional shape of the through hole (21) is as follows: a circular hole (212) is provided in the center, and the diameter of the circular hole (212) is smaller than the diameter of the PIN pin to be fixed; At least three small straight grooves (213) are radially provided on the wall of the circular hole (212). The small straight grooves (213) are connected to the circular hole (212) and divide the hole wall into multiple independent elastic flaps (214).

3. The elastic clamping PIN box for a PCB forming machine according to claim 2, wherein: The upper entrance of the through hole (21) is provided with a chamfer (211).

4. The elastic clamping PIN box for a PCB forming machine according to claim 3, wherein: The base (1) has multiple lower through holes (11) on its bottom wall. The lower through holes (11) are coaxially corresponding to the through holes (21), and the diameter of the lower through holes (11) is larger than the diameter of the circular hole (212).

5. The elastic clamping PIN box for a PCB forming machine according to claim 4, wherein: The number of the small straight grooves (213) is three or four, and they are evenly distributed along the circumference of the circular hole (212).

6. The elastic clamping PIN box for a PCB forming machine as described in claim 5, characterized in that: The cover plate (3) is detachably connected to the base (1) by fasteners.

7. The elastic clamping PIN box for a PCB forming machine as described in claim 6, characterized in that: The thickness of the intermediate layer (2) is 20 mm to 50 mm.

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