Needle tube cutting and grinding equipment with clamping fixture

Abstract

This utility model relates to the field of precision machining equipment for medical devices, and more particularly to a needle tube cutting and grinding device with clamping fixture. It includes a mounting plate mounted on a worktable. A flip plate is rotatably connected to the top of the mounting plate. A motor is mounted on the side of the mounting plate, and the motor's output shaft is coaxially connected to the rotating shaft of the flip plate. A placement frame is connected inside the flip plate. A pressure plate is slidably connected to the side of the placement frame that contacts the mounting plate. Guide rods are connected to both ends of the pressure plate and slidably connected within the placement frame. A return spring is sleeved on the guide rod, with one end connected to the placement frame and the other end connected to the guide rod. The pressure plate and placement frame are used to clamp needle tubes. An adjustment component for adjusting the needle tube insertion depth is provided inside the placement frame. Through the elastic clamping mechanism formed by the return spring and guide rods, the clamping force is stable and controllable when the pressure plate slides, and it returns to its original position evenly after being released, maintaining stable clamping force and achieving stable control of the clamping process.

Description

Technical Field

[0001] This utility model relates to the field of precision machining equipment for medical devices, and in particular to a needle tube cutting and grinding equipment with clamping fixture. Background Technology

[0002] Needles, as a key basic component in the medical field, are widely used in medical devices such as syringes, infusion sets, and puncture needles. Their core structure is typically a hollow tubular body made of metal materials such as stainless steel, with the tip requiring machining to form a sharp point with a specific bevel angle to achieve precise puncture. The geometric accuracy of the tip directly affects the performance and clinical safety of the medical device; therefore, the development of needle tip molding processes and processing equipment has always been a key focus of technological research in the industry.

[0003] Existing needle tip grinding equipment generally adopts a batch processing approach. A row of needles to be processed is placed side-by-side in a base-plate fixture. The locking screws at both ends of the fixture are manually tightened, and the axial thrust of the screws deforms the elastic pressure plate inside the fixture, thus simultaneously clamping and fixing multiple needles. Subsequently, a drive mechanism rotates an inclined grinding wheel at high speed, causing the working surface of the grinding wheel to contact the tip of the needle, gradually forming the desired tip shape through grinding. While this technology achieves batch processing of needle tips to some extent, it still has significant technical shortcomings in terms of clamping control and processing consistency.

[0004] The existing equipment has several problems in the clamping process. The screw tightening force depends entirely on the operator's experience. If the clamping force is too small, it will easily cause the needle to shift due to processing vibration. If the clamping force is too large, it may cause the tube to deform or even break. When the needle is placed into the fixture, the end face needs to be leveled by manual manipulation. The difference in the flatness of the end face directly leads to the fluctuation of the tip length after grinding. Utility Model Content

[0005] To overcome the shortcomings of clamping force and flatness fluctuations, this utility model provides a needle tube cutting and grinding device with clamping fixture, which aims to solve the above-mentioned shortcomings.

[0006] A needle tube cutting and grinding device with clamping fixture includes a mounting plate mounted on a worktable. A flip plate is rotatably connected to the top of the mounting plate, and a motor is mounted on the side of the mounting plate. The output shaft of the motor is coaxially connected to the rotating shaft of the flip plate. A placement frame is connected inside the flip plate, and a pressure plate is slidably connected to the side of the placement frame that contacts the mounting plate. Guide rods are connected to both ends of the pressure plate and are slidably connected inside the placement frame. A return spring is sleeved on the guide rod, with one end connected to the placement frame and the other end connected to the guide rod. The pressure plate and the placement frame are used to clamp the needle tubes. An adjustment component for adjusting the insertion depth of the needle tubes is provided inside the placement frame.

[0007] Optionally, the adjustment assembly includes an adjustment plate, with a screw rotatably connected to both ends of the placement frame and a limit rod fixedly connected to both ends. The adjustment plate is slidably connected to the placement frame, with one end of the adjustment plate threadedly connected to the screw and the other end slidably connected to the limit rod.

[0008] Optionally, a rubber pad is connected to the top surface of the adjustment plate.

[0009] Optionally, the placement rack is connected to a plurality of limiting blocks, which are used to space the needle tubes.

[0010] Optionally, a support plate is connected to the top surface of the mounting plate. The support plate is located at the front end of the flip plate, and the needle grinding end is located at the top of the support plate. The top surface of the support plate is provided with anti-slip texture, and the friction force is moderate when the needle end contacts.

[0011] Optionally, a top block is connected to the top surface of the mounting plate, the top block is pressed and engaged with the pressure plate, and several adhesive strips are provided on the side of the pressure plate that contacts the mounting plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The elastic clamping mechanism formed by the return spring and the guide rod makes the clamping force stable and controllable when the pressure plate slides, and can return to its original position evenly after being released, thus maintaining the stability of the clamping force and achieving stability control of the clamping process.

[0014] 2. By limiting the lateral displacement of the needle tube with a limiting block, and in conjunction with the adjustment component, it adapts to the end contact requirements of needle tubes with different diameters and lengths, solves the problem of end face flatness fluctuation caused by manual leveling, and ensures the consistency of tip length after grinding. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram showing the connection relationship between the motor and the flip plate of this utility model.

[0017] Figure 3 This is a cross-sectional view showing the connection relationship between the guide rod and the reset spring of this utility model.

[0018] Figure 4 This is a cross-sectional view showing the connection relationship between the adjusting plate and the screw of this utility model.

[0019] The markings in the attached diagram are as follows: 1: Mounting plate, 101: Needle tube, 2: Motor, 3: Flip plate, 4: Placement rack, 5: Pressure plate, 501: Top block, 6: Guide rod, 7: Return spring, 8: Adjusting plate, 9: Screw, 10: Limiting rod, 11: Rubber pad, 12: Limiting block, 13: Support plate, 14: Rubber strip. Detailed Implementation

[0020] Although this invention may be described with respect to a particular application or industry, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0021] Example: A needle tube cutting and grinding device with clamping fixture, such as... Figures 1-4 As shown, the assembly includes a mounting plate 1, a needle tube 101, a motor 2, a flipping plate 3, a placement frame 4, a pressure plate 5, a guide rod 6, a return spring 7, and an adjustment assembly. The mounting plate 1 is mounted on the worktable. The flipping plate 3 is rotatably connected to the top of the mounting plate 1. The motor 2 is mounted on the side of the mounting plate 1. The output shaft of the motor 2 is coaxially connected to the rotating shaft of the flipping plate 3. The motor 2 is a stepper motor with a self-locking function, which can keep the flipping plate 3 in a fixed position during the grinding process, avoid vibration-induced angle deviation, and ensure stable grinding accuracy. The placement frame 4 is fixedly connected inside the flipping plate 3. The pressure plate 5 is slidably connected to the side of the placement frame 4 that contacts the mounting plate 1. The two ends of the pressure plate 5 are connected to the guide rods 6, which are slidably connected inside the placement frame 4. The guide rods 6 are fitted with a return spring 7. One end of the return spring 7 is connected to the placement frame 4, and the other end is connected to the guide rod 6. The pressure plate 5 and the placement frame 4 are used to clamp the needle tube 101. The placement frame 4 is equipped with an adjustment assembly to adjust the insertion depth of the needle tube 101.

[0022] like Figure 3 and Figure 4 As shown, the adjustment assembly includes an adjustment plate 8, a screw 9, and a limiting rod 10. The screw 9 is rotatably connected to both ends of the placement frame 4, and the limiting rod 10 is fixedly connected to both ends. The adjustment plate 8 is slidably connected to the placement frame 4. One end of the adjustment plate 8 is threadedly connected to the screw 9, and the other end is slidably connected to the limiting rod 10. The screw 9 adopts a fine thread structure, which ensures high movement accuracy of the adjustment plate 8 when rotating. The limiting rod 10 has a chrome-plated surface and a low coefficient of sliding friction, ensuring a smooth and uninterrupted adjustment process.

[0023] like Figure 4 As shown, it also includes a rubber pad 11, and the top surface of the adjusting plate 8 is connected to the rubber pad 11.

[0024] like Figure 3As shown, it also includes a limiting block 12. Several limiting blocks 12 are connected inside the placement frame 4. The limiting blocks 12 are used to space the needle tubes 101. The spacing can be adjusted by replacing the limiting blocks 12 with different spacings. The top of the limiting block 12 is machined with an arc-shaped groove that fits against the curved surface of the outer wall of the needle tube 101, which limits lateral displacement and reduces contact wear.

[0025] like Figure 1 and Figure 2 As shown, it also includes a support plate 13. The top surface of the mounting plate 1 is connected to the support plate 13. The support plate 13 is located at the front end of the flip plate 3. The polished end of the needle tube 101 is located at the top of the support plate 13. The top surface of the support plate 13 is provided with anti-slip texture, and the friction force is moderate when the end of the needle tube 101 contacts.

[0026] like Figure 2 As shown, it also includes a top block 501 and adhesive strips 14. The top block 501 is connected to the top surface of the mounting plate 1. The top block 501 is pressed and fitted with the pressure plate 5. Several adhesive strips 14 are provided on the side of the pressure plate 5 that contacts the mounting plate 1.

[0027] The operator starts motor 2 and rotates it clockwise. The output shaft of motor 2 drives the flip plate 3 to rotate synchronously around the top shaft of mounting plate 1. As the flip plate 3 gradually tilts to a vertical position, the placement rack 4 moves synchronously to the vertical position with the flip plate 3. At this time, the operator manually pulls the pressure plate 5 outward. The guide rods 6 connected to both ends of the pressure plate 5 slide along the inner wall of the placement rack 4. The return springs 7 sleeved on the outer periphery of the guide rods 6 are gradually compressed, generating elastic potential energy. When the distance between the pressure plate 5 and the placement rack 4 is sufficient, a batch of syringes 101 are neatly placed between them. Multiple limiting blocks 12 set on the inner wall of the placement rack 4 provide lateral positioning for the syringes 101 to prevent displacement during placement.

[0028] After releasing the pressure plate 5, the elastic potential energy stored in the return spring 7 is released, pushing the guide rod 6 to slide in the opposite direction, causing the pressure plate 5 to return to its original position towards the placement frame 4, until the pressure plate 5 contacts the outer wall of the needle tube 101 to achieve initial clamping. Then, the motor 2 is started to rotate counterclockwise, and the flipping plate 3 drives the placement frame 4 to flip towards the mounting plate 1. When the bottom of the pressure plate 5 contacts the top surface of the mounting plate 1, the rubber strip 14 on the contact side of the pressure plate 5 and the top block 501 exert a squeezing effect. The lifting force of the top block 501 on the pressure plate 5 causes the pressure plate 5 to further press the needle tube 101. At the same time, the rubber strip 14 and the limiting block 12 undergo adaptive elastic deformation to ensure that the clamping force is evenly distributed. At this time, the grinding end of the needle tube 101 is exactly located on the top of the support plate 13, forming a stable support state, and the grinding device can be started to perform the tip grinding operation.

[0029] After grinding, motor 2 drives the flip plate 3 to rotate clockwise again. The rubber strip 14 gradually disengages from the top block 501, and the clamping force of the pressure plate 5 on the needle tube 101 is gradually released. However, the end of the needle tube 101 still protrudes from the end of the placement rack 4 due to its own gravity, making it easy for the operator to directly remove the processed needle tube 101. When it is necessary to adapt needle tubes 101 of different lengths, the operator manually rotates the screw 9. The rotation of the screw 9 drives the adjusting plate 8 to slide axially along the limiting rod 10. The rubber pad 11 on the top surface of the adjusting plate 8 contacts the end of the needle tube 101. By changing the distance between the adjusting plate 8 and the opening at the end of the placement rack 4, the insertion depth of the needle tube 101 can be precisely adjusted. The elasticity of the rubber pad 11 can prevent mechanical damage to the end of the needle tube 101 during the adjustment process.

[0030] By pressing the top block 501 against the bottom of the pressure plate 5, and combining the elastic properties of the rubber strip 14, a uniform reaction force is generated when the pressure plate 5 contacts the mounting plate 1, which enhances the clamping stability. At the same time, the anti-slip texture design on the top surface of the support plate 13 forms a moderate friction constraint at the grinding end of the needle tube 101, avoiding excessive sliding that affects grinding efficiency, and achieving dual optimization of clamping force and processing accuracy.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pin tube array cutting and grinding apparatus with a clamping tooling device, characterized by: The device includes a mounting plate (1) mounted on a workbench. A flip plate (3) is rotatably connected to the top of the mounting plate (1). A motor (2) is mounted on the side of the mounting plate (1). The output shaft of the motor (2) is coaxially connected to the rotating shaft of the flip plate (3). A placement frame (4) is connected inside the flip plate (3). A pressure plate (5) is slidably connected to the side of the placement frame (4) that contacts the mounting plate (1). Guide rods (6) are connected to both ends of the pressure plate (5). The guide rods (6) are slidably connected inside the placement frame (4). A return spring (7) is sleeved on the guide rod (6). One end of the return spring (7) is connected to the placement frame (4), and the other end is connected to the guide rod (6). The pressure plate (5) and the placement frame (4) are used to clamp the needle tube (101). An adjustment component for adjusting the insertion depth of the needle tube (101) is provided inside the placement frame (4).

2. The belt clamping tooling pin tube row cutting and grinding apparatus according to claim 1, characterized in that: The adjustment assembly includes an adjustment plate (8). The two ends of the placement frame (4) are respectively rotatably connected to a screw (9) and a fixed connection to a limit rod (10). The adjustment plate (8) is slidably connected to the placement frame (4). One end of the adjustment plate (8) is threadedly connected to the screw (9), and the other end is slidably connected to the limit rod (10).

3. The belt clamping tooling pin tube row cutting and grinding apparatus according to claim 2, characterized in that: The top surface of the adjusting plate (8) is connected to a rubber pad (11).

4. The belt clamping tooling pin tube row cutting and grinding apparatus according to claim 3, characterized in that: The placement rack (4) is connected to a plurality of limiting blocks (12), which are used to space the needle tubes (101).

5. The belt clamping tooling pin tube row cutting and grinding apparatus of claim 4 wherein: The mounting plate (1) is connected to a support plate (13) on its top surface. The support plate (13) is located at the front end of the flip plate (3). The polished end of the needle tube (101) is located at the top of the support plate (13). The top surface of the support plate (13) is provided with anti-slip texture, and the friction force is moderate when the end of the needle tube (101) contacts.

6. The belt clamping tooling pin tube row cutting and grinding apparatus of claim 5 wherein: The top surface of the mounting plate (1) is connected to a top block (501), the top block (501) is pressed and engaged with the pressure plate (5), and a number of adhesive strips (14) are provided on the side of the pressure plate (5) that contacts the mounting plate (1).

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