Medical sample needle bending equipment
By leveraging the synergistic effect of the clamping and pushing mechanism, the bending actuator, and the springback compensation mechanism, the springback problem during needle bending is solved, achieving efficient and precise needle bending and improving the dimensional accuracy and processing quality of the finished product.
Patent Information
- Application Number
- CN202511464694.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2025-11-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing technologies, the needle tube is prone to springing back during bending, causing the finished product to deviate from the expected shape. The secondary bending operation is cumbersome and prone to positioning errors, reducing the processing quality.
The device employs a clamping and pushing mechanism, a bending actuator, and a springback compensation mechanism. The clamping and pushing mechanism holds the needle tube and limits its axial movement and circumferential rotation. The bending actuator uses a bending die and fixture for precise bending. Combined with the springback compensation mechanism's angle detection and bending compensation device, the springback of the needle tube is detected and compensated in real time to ensure the accuracy of the finished product.
It achieves efficient and precise needle bending, avoids secondary clamping, improves the dimensional accuracy and processing quality of finished products, and simplifies the operation process.
Smart Images
Figure CN120940538A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of non-cutting processing of tubing, and in particular to a medical sample needle bending device. Background Technology
[0002] Medical curved needles include insulin pump curved needles, cleaning curved needles, infusion curved needles, and medication dispensing curved needles. Currently, medical curved needles are mostly manufactured by bending the end of a straight needle using tubing bending equipment.
[0003] Pipe bending equipment can meet the needs of modern production with large-volume, high-efficiency operations. The main structure of the pipe bending equipment includes a frame, clamping die, bending die, booster device, and CNC system. During operation, the needle tube is fixed to the clamping die, and the bending die rotates around its axis under the drive of hydraulic pressure or a servo motor, forcing the needle tube to bend around it. The booster device prevents the pipe from wrinkling or deforming during the bending process.
[0004] However, after the bending die is unloaded, the needle tube is prone to springback, causing the actual bending angle and radius of curvature of the bent part to deviate from the set bending curvature. The resulting bent product deviates from the expected shape, affecting the dimensional accuracy and usability of the finished product. Although some bending equipment is equipped with springback detection devices to address the springback problem, it is usually necessary to remove the workpiece, re-clamp it based on the detected springback data, and perform a secondary bending adjustment. This secondary clamping operation is cumbersome and prone to positioning errors, further reducing the processing quality due to the secondary bending. Summary of the Invention
[0005] To address the problems of needle rebound causing the finished product to deviate from the expected shape, and the cumbersome secondary bending operation that easily generates positioning errors and reduces processing quality, this application provides a medical sample needle bending device.
[0006] This application provides a medical sample needle bending device, which adopts the following technical solution: A medical sample needle bending device, comprising: The clamping and pushing mechanism includes a feeding clamp and a first driving unit. The feeding clamp includes a rotating clamping member, which is used to clamp the needle tube, limit the needle tube axially, and enable the needle tube to rotate circumferentially. The first driving unit is used to drive the feeding clamp to move the needle tube in translation. A bending actuator includes a bending die, a bending fixture, and a second drive unit. The bending die includes a shaping column. The bending fixture is used to hold the part of the needle tube to be bent. The second drive unit is used to drive the bending fixture to rotate so that the needle tube bends along the shaping column. The bent part of the needle tube is removed from the bending fixture by circumferential rotation of the needle tube. The springback compensation mechanism includes a bend detection device and a bend compensation device. The bend compensation device includes a sliding bracket, support rollers and bending pressure rollers spaced apart on the sliding bracket. The support rollers are used to cooperate with the bend of the needle tube. The bending pressure rollers are used to abut against the bend of the needle tube. The mechanism also includes a fourth drive unit, which drives the bending pressure rollers to push against the bend of the needle tube to complete the compensation. The clamping and pushing mechanism is also used to drive the needle tube to move so that the inner edge of the bend of the needle tube is aligned with the support rollers.
[0007] By adopting the above technical solution, after the needle tube is clamped by the feeding fixture of the clamping and pushing mechanism and the rotating clamping component inside the bending fixture, it is translated under the drive of the first drive unit. During the operation of the bending execution mechanism, the needle tube is conveyed towards the bending execution mechanism. The bending fixture of the bending execution mechanism rotates under the drive of the second drive unit, cooperating with the shaping column of the bending die to perform a bending operation on the needle tube. After bending, the operator rotates the needle tube circumferentially to remove the bent portion of the needle tube from the bending fixture. The clamping and pushing mechanism continues to push the needle tube. The first drive unit controls the pushing distance of the bent needle tube according to the distance between the shaping column and the support roller, so that after the clamping and pushing mechanism drives the needle tube to move, the inner edge of the bent angle of the needle tube is aligned with the support roller. During the process of pushing the bent needle tube by the clamping and pushing mechanism, the operator needs to rotate the needle tube circumferentially again to reset the needle tube. At this time, the bending angle detection device detects the bending angle of the needle tube and obtains the angular springback amount of the needle tube. Subsequently, based on the springback amount, the support roller and bending pressure roller of the compensation bending device are moved to the needle tube under the drive of the sliding bracket. The support roller smoothly engages with the inner edge of the bent portion of the needle tube; the bending pressure roller pushes against the bent portion of the needle tube to perform compensation bending, overcoming the needle tube springback problem and ensuring that the dimensional accuracy and shape of the bent product meet expectations. After detecting the angular springback amount of multiple needle tubes, the average springback amount is taken, and the bending execution data of the bending actuator is readjusted so that the actual bending angle is increased by a springback compensation amount based on the designed bending angle. This ensures that the finished product obtained in subsequent processing meets expectations, and no further springback compensation is required for the needle tube in subsequent processing; the needle tube can be directly removed after bending. Each mechanism is sequentially set on the frame and works together to achieve efficient and precise bending of medical sample needles, eliminating the need for secondary clamping after needle tube removal. This solves the problems in existing technologies where needle tube springback causes the finished product to deviate from the expected shape, and the secondary bending operation is cumbersome and prone to positioning errors that reduce processing quality.
[0008] Optionally, the clamping and pushing mechanism is further provided with a length positioning mechanism at the end away from the bending actuator. The length positioning mechanism includes a length fixing platform and a locking rod passing through the length fixing platform. The locking rod has a needle tail locking groove.
[0009] By adopting the above technical solution, the length positioning mechanism is located at the end of the clamping and pushing mechanism away from the bending actuator. The needle tail of the needle tube can be engaged in the needle tail engaging groove of the engaging rod, and the needle tube is positioned using the length fixing table and the engaging rod. During batch processing, the length positioning mechanism can limit the bending position of a batch of needle tubes of equal length, ensuring that the bending position of the processed needle tubes meets the requirements.
[0010] Optionally, the feeding fixture includes a lifting source, an upper pressure block and a lower pressure block arranged opposite to each other, and the lifting source is used to drive the upper pressure block and the lower pressure block to slide relative to each other; The rotating clamping member includes a first rotating pressure bar and a second rotating pressure bar. The first rotating pressure bar is rotatably connected to the upper pressure block and is provided with an upper needle groove. The second rotating pressure bar is rotatably connected to the lower pressure block and is provided with a lower needle groove. The upper needle groove and the lower needle groove are arranged opposite to each other.
[0011] By adopting the above technical solution, the upper and lower pressure blocks of the feeding fixture are arranged opposite to each other, and the upper and lower needle slots are arranged opposite to each other. With the help of the lifting source, the needle tube can be clamped by the first and second rotating pressure bars, which facilitates the feeding fixture to move and feed material under the drive of the first drive unit. The arrangement of the first and second rotating pressure bars allows the needle tube to rotate circumferentially while it is clamped, without the need for the feeding fixture to loosen the material. This prevents the needle tube from shifting axially during circumferential rotation and helps to ensure accurate alignment and fit between the inner edge of the needle tube bend and the support roller.
[0012] Optionally, the bending die further includes a die base, the shaping column is rotatably connected to the die base, and the die base is also provided with a needle-threading channel; The bending fixture includes a rotating base, a first telescopic source, and a first clamping block and a second clamping block disposed opposite to each other on the rotating base. The rotating base is rotatably disposed, and the first telescopic source is used to drive the second clamping block to slide. The first clamping block is provided with a first needle receiving groove, and the second clamping block is provided with a second needle receiving groove, and the first needle receiving groove and the second needle receiving groove are arranged opposite to each other; The rotation axis of the bending fixture is coaxial with the rotation axis of the shaping column.
[0013] By adopting the above technical solution, the mold base of the bending mold is fixed on the machine frame, and the shaping column is rotatably connected to the mold base. The needle channel on the mold base allows the needle tube to pass through, providing a path for needle tube delivery. The rotating base of the bending fixture is rotatably mounted on the machine frame. The first telescopic source can drive the second clamping block to slide, causing the first clamping block and the second clamping block to move relative to each other. The needle tube is clamped by the first needle receiving groove and the second needle receiving groove being arranged opposite each other. Since the rotation axis of the bending fixture is coaxial with the rotation axis of the shaping column, when the bending fixture rotates, the needle tube can be bent and shaped along the outer wall of the shaping column, achieving precise bending of the needle tube, ensuring the accuracy and stability of bending, and improving the processing quality of medical sample needles.
[0014] Optionally, it also includes a corner positioning mechanism disposed on one side of the bending actuator. The corner positioning mechanism includes an angle fixing platform and a positioning abutment, one end of which is used to abut against the bending clamp. The positioning abutment is movable on the angle fixing platform, and the positioning abutment can be locked after it is moved.
[0015] By adopting the above technical solution, the corner positioning mechanism is set on one side of the bending actuator. The positioning abutment on the angle fixing table can be locked after movement, and one end of the positioning abutment can abut against the bending fixture. When the equipment is working, the position of the positioning abutment can be adjusted and locked according to actual needs, so that the bending fixture rotates to the position abutting against the positioning abutment, thereby accurately controlling the bending angle of the needle tube and improving the consistency of the bending angle of the needle tube during batch processing.
[0016] Optionally, it also includes a stabilization mechanism, including a stabilization clamp and a drive assembly, wherein the stabilization clamp is used to hold the needle tube, and the drive assembly is used to drive the stabilization clamp to move up, down and translate. The driving component includes a translation unit and a lifting unit. The translation unit is fixed above the bending actuator and is used to drive the lifting unit to slide. The lifting unit includes a lifting support, and the stabilizing clamp is fixed on the lifting support. The stabilizing clamp includes a second telescopic source, a third clamping block, and a fourth clamping block. The second telescopic source is used to drive the fourth clamping block to slide. The third clamping block is provided with a third needle receiving groove, and the fourth clamping block is provided with a fourth needle receiving groove, and the third needle receiving groove and the fourth needle receiving groove are arranged opposite to each other.
[0017] By adopting the above technical solution, before performing rebound correction, the stabilization mechanism must be activated first. The stabilization clamp, driven by the drive assembly, descends to the needle tube, clamping the non-bent portion of the needle tube for stable support. During clamping, the fourth clamping block is driven to slide via the second telescopic source, causing relative movement between the third and fourth clamping blocks to hold the needle tube. The drive assembly includes a translation unit and a lifting unit. The translation unit can drive the lifting unit to slide, enabling the translation and lifting movements of the stabilization clamp, facilitating the clamping and support operation during the rebound compensation process. Furthermore, after compensation is completed, the needle tube can be removed using the stabilization mechanism.
[0018] Optionally, a support groove is provided on the outer wall of the support roller, and a bending groove is provided on the outer wall of the bending pressure roller. Both the support groove and the bending groove are annular and are designed to accommodate the needle tube.
[0019] By adopting the above technical solution, the annular support groove on the outer wall of the support roller and the annular bending groove on the outer wall of the bending pressure roller can accommodate the needle tube. During the bending process of the needle tube, they play a supporting and positioning role, ensuring the stability and accuracy of the needle tube during the bending operation and improving the bending quality.
[0020] Optionally, the first drive unit includes a propulsion motor, and the second drive unit includes a rotary motor; It also includes a current detection module and a servo control module. The current detection module is used to collect the drive current of the propulsion motor and the rotary motor in real time, and the servo control module is electrically connected to the propulsion motor and the rotary motor.
[0021] By adopting the above technical solution, the current detection module collects the drive current of the propulsion motor and the rotary motor in real time to identify the force on the needle tube. The servo control module automatically adjusts the driving force of the propulsion motor and the rotary motor according to the current data collected by the current detection module. When it is detected that the force on the needle tube exceeds the preset value, the propulsion motor automatically increases the propulsion speed to feed the needle tube, avoids the needle tube from breaking, and ensures the stability of the bending process and the integrity of the needle tube.
[0022] Optionally, a distance sensor is provided on the support roller to detect the distance between the support roller and the needle tube; It also includes a third drive unit, which is used to drive the sliding bracket to slide, and the distance sensor is electrically connected to the first drive unit and the third drive unit; After the distance sensor detects that the distance between the support roller and the needle tube remains unchanged, the first drive unit stops, and the third drive unit drives the sliding bracket to slide.
[0023] By adopting the above technical solution, the distance sensor on the support roller can detect the distance between it and the needle tube. Since the distance sensor is electrically connected to the third drive unit and the translation unit, the first drive unit stops when the distance between the support roller and the needle tube measured by the distance sensor remains unchanged. The alignment of the inner edge of the bend angle of the needle tube with the support roller is calibrated by the signal measured by the distance sensor to ensure that the clamping and pushing mechanism accurately pushes the bent needle tube. When the first drive unit stops, the third drive unit drives the sliding bracket to slide, moving the support roller to abut against the inner edge of the bend angle of the needle tube. Then, based on the previously calculated angle rebound amount, the bending pressure roller is driven to bend the needle tube a second time. The bend angle detection device continues to monitor the bending angle of the needle tube until the bending angle reaches the standard, thereby realizing precise control of the needle tube bending compensation process, which helps to improve the accuracy and quality of needle tube bending processing.
[0024] Optionally, the needle tail snap-fit groove includes a snap-fit groove section and a support groove section that are interconnected.
[0025] By adopting the above technical solution, the needle tail retaining groove is set with interconnected retaining groove sections and support groove sections, which can better retain and support the needle tube tail end. In conjunction with the length positioning mechanism, the length of the needle tube to be bent can be determined more accurately, providing a more stable and reliable positioning basis for subsequent needle tube bending processing, and improving the dimensional accuracy and processing quality of medical sample needle bending.
[0026] In summary, this application includes at least one of the following beneficial effects: 1. The springback compensation mechanism in this application has an angle detection device that accurately detects the bending angle of the needle tube, and a bending compensation device that compensates for the bending in a timely manner, making the bending angle and curvature of the finished product more accurate. 2. This application can directly perform springback compensation bending, avoid secondary clamping, reduce positioning errors, improve processing quality, and make the operation process simpler and more efficient; 3. The needle tail retaining groove of the length positioning mechanism of this application can accurately retain the needle tail, and can more accurately determine the length of the needle tube to be bent, providing a more stable and reliable positioning basis for subsequent needle tube bending processing, and improving the dimensional accuracy and processing quality of medical sample needle bending. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of the medical sample needle bending device according to Embodiment 1 of this application; Figure 2 This is a cross-sectional view of the length positioning mechanism in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the feeding fixture in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the bending actuator in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the overall structure of the medical sample needle bending device according to Embodiment 2 of this application; Figure 6 This is a partial exploded structural diagram of the clamping booster mechanism in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the stabilization fixture in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the structure of the third driving unit in Embodiment 2 of this application; Figure 9 This is a cross-sectional view of the support roller in Embodiment 2 of this application; Explanation of reference numerals in the attached drawings: 1. Clamping and pushing mechanism; 11. Feeding fixture; 111. Lifting source; 112. Upper pressure block; 1121. First rotating pressure bar; 1122. Fifth needle slot; 113. Lower pressure block; 1131. Second rotating pressure bar; 1132. Sixth needle slot; 114. Circular guide rail; 12. First drive unit; 121. Propulsion motor; 122. Transmission device; 2. Bending actuator; 21. Bending die; 211. Die base; 2111. Mounting groove; 212. Shaping column; 2121. Forming ring groove; 22. Bending fixture; 221. Rotating base; 222. First telescopic source; 223. First clamping block; 2231. First needle groove; 224. Second clamping block; 2241. Second needle groove; 23. Second drive unit; 3. Stabilization mechanism; 31. Stabilization clamp; 311. Second telescopic source; 312. Third clamping block; 3121. Third needle slot; 313. Fourth clamping block; 3131. Fourth needle slot; 32. Drive assembly; 321. Translation unit; 322. Lifting unit; 3221. Lifting support; 4. Springback compensation mechanism; 41. Angle detection device; 42. Compensating bending device; 421. Sliding bracket; 422. Support roller; 4221. Support groove; 423. Bending pressure roller; 4231. Bending groove; 43. Distance sensor; 5. Rack; 6. Length positioning mechanism; 61. Length fixing platform; 62. Snap-fit rod; 621. Needle tail snap-fit groove; 6211. Snap-fit groove section; 6212. Support groove section; 7. Corner positioning mechanism; 71. Angle fixing platform; 72. Positioning stop bar; 8. Third drive unit; 81. Drive motor; 82. Drive screw; 9. Fourth drive unit. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8This application will be described in further detail.
[0029] Example 1
[0030] Reference Figure 1 The medical sample needle bending device provided in this application includes a length positioning mechanism 6, a clamping and pushing mechanism 1, a bending execution mechanism 2, and a frame 5. The length positioning mechanism 6, the clamping and pushing mechanism 1, and the bending execution mechanism 2 are sequentially arranged on the frame 5 in a horizontal direction, enabling the needle tube to complete the bending process through the coordinated action of each mechanism, thereby improving the efficiency and quality of bending.
[0031] Reference Figure 1 and Figure 2 The length positioning mechanism 6 includes a length fixing platform 61 and a locking rod 62 passing through the length fixing platform 61. The length fixing platform 61 is fixed to the frame 5. One end of the locking rod 62 has a needle tail locking groove 621. The needle tail locking groove 621 includes a locking groove section 6211 and a support groove section 6212 that are interconnected. The cross-section of the support groove section 6212 gradually increases in the direction away from the locking groove section 6211. The needle tail locking groove 621 is adapted to the shape of the needle tube end, realizing the stable locking of the needle tube end in the needle tail locking groove 621. The length positioning mechanism 6 can position the installation position of the needle tube on the frame 5, and then position the bending position of the needle tube to ensure that the length of the bent part of the needle tube meets the processing requirements during the bending process. The locking rod 62 can adopt an adjustable structure to accommodate needle tubes of different lengths. In this embodiment, the snap-fit rod 62 is threaded onto the length fixing table 61; the position of the snap-fit rod 62 can be adjusted by rotating it according to bending requirements to meet different processing needs. In other embodiments, bolts can also be used to tighten the snap-fit rod 62 onto the length fixing table 61 to achieve an adjustable connection of the snap-fit rod 62 on the length fixing table 61.
[0032] The length positioning mechanism 6 further improves the accuracy of needle tube bending. By positioning the tail end of the needle tube through the needle tail retaining groove 621, the position of the needle tube is more accurate during the conveying and bending process, reducing bending errors caused by incorrect installation of the needle tube on the frame 5, and improving product consistency and quality.
[0033] Reference Figure 1 and Figure 3The clamping and pushing mechanism 1 includes a feeding clamp 11 and a first driving unit 12. The feeding clamp 11 is used to clamp the needle tube and includes a lifting source 111, an upper pressure block 112 and a lower pressure block 113 arranged opposite to each other. A fifth needle-receiving groove 1122 is opened on the lower end surface of the upper pressure block 112, and a sixth needle-receiving groove 1132 is opened on the upper end surface of the lower pressure block 113, and the fifth needle-receiving groove 1122 and the sixth needle-receiving groove 1132 are arranged opposite to each other. The lifting source 111 is specifically configured as a lifting cylinder. Multiple guide rods are fixedly connected between the lifting cylinder and the lower pressure block 113, and the guide rods pass through the upper pressure block 112. One end of the telescopic rod of the lifting cylinder is fixedly connected to the upper pressure block 112 to drive the upper pressure block 112 to rise and fall along the guide rods.
[0034] When the needle needs to be clamped, the lifting source 111 drives the upper pressure block 112 to descend, causing the fifth needle-receiving groove 1122 and the sixth needle-receiving groove 1132 to engage and clamp the needle. The first driving unit 12 is used to drive the feeding clamp 11 to translate. The first driving unit 12 includes a propulsion motor 121, which drives the feeding clamp 11 to move through a transmission device 122. The transmission device 122 can be a belt drive, chain drive, or lead screw drive, etc. In this embodiment, the transmission device 122 is specifically set as a lead screw. The combination of the feeding clamp 11 and the first driving unit 12 can accurately deliver the needle when the bending actuator 2 is running.
[0035] Reference Figure 1 and Figure 4The bending actuator 2 includes a bending die 21, a bending fixture 22, and a second drive unit 23. The bending die 21 includes a shaping column 212 and a die base 211 fixed to the frame 5. The die base 211 has a mounting groove 2111, and the shaping column 212 is rotatably connected to the mounting groove 2111 of the die base 211 via a rotating shaft. A forming ring groove 2121 is formed on the outer wall of the shaping column 212 to accommodate a needle tube. The die base 211 also has a needle insertion channel for the needle tube to pass through, and the needle insertion channel is coaxially arranged with the needle tail retaining groove 621. The shaping column 212 can be made of alloy steel. The bending fixture 22 includes a rotating base 221, a first telescopic source 222, and a first clamping block 223 and a second clamping block 224 disposed opposite to each other on the rotating base 221. The rotating base 221 is rotatably connected to the frame 5. A first needle-receiving groove 2231 is provided on the first clamping block 223, and a second needle-receiving groove 2241 is provided on the second clamping block 224. The first needle-receiving groove 2231 and the second needle-receiving groove 2241 are arranged opposite to each other. The first clamping block 223 is fixed to the rotating base 221 and is also rotatably connected to the mounting groove 2111 via a rotating shaft. The rotation axis of the first clamping block 223 is coaxial with the rotation axis of the shaping column 212, and the rotation axis of the bending fixture 22 is coaxial with the rotation axis of the shaping column 212. The first telescopic source 222 is a first telescopic cylinder, which is fixed to the rotating base 221. One end of the telescopic rod of the first telescopic cylinder is fixedly connected to the second clamping block 224. Activating the first telescopic cylinder enables the bending fixture 22 to perform clamping and material release actions. The second drive unit 23 is specifically configured as a rotary motor. The output shaft of the rotary motor is fixed to the rotary base 221, driving the rotary base 221 to rotate, thereby causing the bending fixture 22 to rotate, so that the needle tube bends around the forming annular groove 2121 of the shaping column 212. The coordinated work of the bending die 21 and the bending fixture 22 can bend the needle tube into the required shape.
[0036] Reference Figure 1 and Figure 4 A corner positioning mechanism 7 is provided on one side of the bending actuator 2. The corner positioning mechanism 7 includes an angle fixing platform 71 and a positioning abutment 72. One end of the positioning abutment 72 is used to abut against the bending fixture 22. The positioning abutment 72 is movable on the angle fixing platform 71 and can be locked after movement. By abutting against the bending fixture 22, the rotation angle of the bending fixture 22 is limited and positioned, reducing bending errors caused by inaccurate rotation angles. In this embodiment, the positioning abutment 72 is threaded onto the angle fixing platform 71, and the thread achieves self-locking of the positioning point on the angle fixing platform 71. The positioning abutment 72 can be moved to different positions according to different bending needs to improve the applicability of the corner positioning mechanism 7.
[0037] To coordinate the bending and needle pushing actions and improve processing quality, a current detection module and a servo control module are also included. The current detection module is electrically connected to the propulsion motor 121 and the rotary motor 231 to collect the drive current of the propulsion motor 121 and the rotary motor 231 in real time. The servo control module is electrically connected to the current detection module, the propulsion motor 121, and the rotary motor, and can calculate the bending force of the bending actuator 2 in real time based on the current value monitored by the current detection module. When the bending force exceeds a preset threshold, the feeding speed of the propulsion motor 121 is increased to ensure a smooth bending process and reduce damage to the needle during bending.
[0038] The implementation principle of this embodiment is as follows: First, the needle tube is placed between the first needle-receiving groove 2231 and the second needle-receiving groove 2241 of the bending fixture 22. Then, the needle tube is passed through the mold base 211 along the needle-threading channel. Subsequently, the needle tube is placed between the fifth needle-receiving groove 1122 and the sixth needle-receiving groove 1132 of the feeding fixture 11. The needle tube is pushed further, pushing the end of the needle tube into the needle tail retaining groove 621. The lifting source 111 drives the upper pressure block 112 to descend and clamp the needle tube. The first telescopic source 222 of the bending fixture 22 drives the second clamping block 224 to slide, so that the first needle-receiving groove 2231 and the second needle-receiving groove 2241 cooperate to clamp the needle tube. The rotary motor 231 drives the rotating base 221 to rotate, which drives the bending fixture 22 to rotate, so that the needle tube bends around the forming ring groove 2121 of the shaping column 212. When the rotary motor 231 is running, the propulsion motor 121 drives the feeding fixture 11 to translate according to the operating status of the rotary motor 231, pushing the needle tube closer to the bending actuator 2. During the rotation of the bending fixture 22, the bending fixture 22 abuts against the positioning rod 72 of the corner positioning mechanism 7, and the servo control module automatically shuts down the rotary motor 231; finally, the operator rotates the needle tube circumferentially to move the bent part of the needle tube out of the bending fixture 22, and then takes out the processed needle tube.
[0039] Example 2
[0040] The difference between this embodiment and Embodiment 1 is that: Reference Figure 5 In this embodiment, the frame 5 structure differs from that in Embodiment 1, and a stabilization mechanism 3 and a springback compensation mechanism 4 are added to the frame 5. Both the stabilization mechanism 3 and the springback compensation mechanism 4 are located on the side of the bending actuator 2 away from the clamping assist mechanism 1. In this embodiment, the feeding fixture 11 does not have a fifth needle-receiving groove 1122 and a sixth needle-receiving groove 1132; the feeding fixture 11 also includes a rotating clamping component.
[0041] Reference Figure 5 and Figure 6The rotating clamping component includes a first rotating pressure bar 1121 and a second rotating pressure bar 1131. An annular guide rail 114 is fixed to the outer wall of both the first and second rotating pressure bars 1121 and 1131, and the cross-section of the annular guide rail 114 is T-shaped. Both the first and second rotating pressure bars 1121 and 1131 are semi-cylindrical. The upper pressure block 112 and the lower pressure block 113 are each provided with a groove that mates with the annular guide rail 114. When the upper and lower pressure blocks 112 and 113 are pressed together, the two grooves form a complete annular channel. There is a certain amount of friction between the annular guide rail 114 and the corresponding groove, making it difficult for the first and second rotating pressure bars 1121 and 1131 to rotate before clamping the needle. The first rotating pressure bar 1121 is slidably connected to the upper pressure block 112 via the annular guide rail 114, and the second rotating pressure bar 1131 is slidably connected to the lower pressure block 113 via the annular guide rail 114. The first rotating pressure bar 1121 has an upper needle-accepting groove; the second rotating pressure bar 1131 is rotatably connected to the lower pressure block 113, and the second rotating pressure bar 1131 has a lower needle-accepting groove, with the upper and lower needle-accepting grooves arranged opposite to each other. Activating the lifting source 111 drives the first rotating pressure bar 1121 and the second rotating pressure bar 1131 to clamp the needle tube.
[0042] The arrangement of the first rotating pressure bar 1121 and the second rotating pressure bar 1131 allows the needle tube to rotate circumferentially while being reliably clamped and preventing axial displacement, without the need for the feeding clamp 11 to loosen the material. This ensures that even after the bend of the needle tube is removed from the bending clamp 22, it can still be accurately pushed to the designated position by the first drive unit 12.
[0043] Reference Figure 5 and Figure 7The stabilization mechanism 3 includes a stabilization clamp 31 and a drive assembly 32. The drive assembly 32 includes a translation unit 321 and a lifting unit 322. The translation unit 321 is located on one side of the bending actuator 2. In this embodiment, both the translation unit 321 and the lifting unit 322 are electric slide modules driven by a motor screw. The translation unit 321 is fixed on the frame 5, and the slide of the translation unit 321 is fixedly connected to the slide rail of the lifting unit 322 to drive the lifting unit 322 to move horizontally. The lifting unit 322 also includes a lifting support 3221, and the lifting support 3221 is fixedly connected to the slide within the lifting unit 322. The stabilization clamp 31 is connected to the lifting support 3221. Starting the lifting unit 322 drives the stabilization clamp 31 to rise and fall. The stabilizing clamp 31 includes a second telescopic source 311, a third clamping block 312, and a fourth clamping block 313. The third clamping block 312 has a third needle-receiving groove 3121, and the fourth clamping block 313 has a fourth needle-receiving groove 3131, with the third and fourth needle-receiving grooves 3121 and 3131 positioned opposite each other. The second telescopic source 311 is specifically a second telescopic cylinder, fixed to a lifting support 3221. The third clamping block 312 is also fixed to the lifting support 3221. One end of the telescopic rod of the second telescopic cylinder passes through the third clamping block 312 and is fixedly connected to the fourth clamping block 313. Activating the second telescopic cylinder enables the stabilizing clamp 31 to perform clamping and releasing actions. Before performing the springback correction operation, the stabilizing mechanism 3 clamps the non-bent portion of the needle tube to achieve stable support and improve the quality of springback compensation.
[0044] Reference Figure 5 and Figure 8 The springback compensation mechanism 4 includes a bend angle detection device 41 and a bend compensation device 42. The bend angle detection device 41 is positioned above the bend compensation device 42 and is used to detect the bending angle of the needle tube. The bend angle detection device 41 can be an industrial camera, which can accurately measure the bending angle of the needle tube. The bend compensation device 42 includes a sliding bracket 421, support rollers 422 spaced apart on the sliding bracket 421, and bending pressure rollers 423. The sliding bracket 421 is slidably connected to the frame 5 via a sliding groove, and the sliding direction of the sliding bracket 421 is perpendicular to the sliding direction of the feeding clamp 11. A third drive unit 8 is also installed on the frame 5. The third drive unit 8 includes a drive motor 81 and a drive screw 82. The drive screw 82 is rotatably connected to the frame 5 via a bearing seat. The drive motor 81 is fixed to the frame 5, and the output shaft of the drive motor 81 is coaxially fixed with the drive screw 82. Starting the drive motor 81 drives the sliding bracket 421 to slide.
[0045] Reference Figure 5 and Figure 8A fourth drive unit 9 is also fixed on the sliding bracket 421. The fourth drive unit 9 is an electric slide module driven by a motor screw. The bending pressure roller 423 is rotatably connected to the slide of the fourth drive unit 9 via a rotating shaft, realizing the sliding connection of the bending pressure roller 423 on the sliding bracket 421. The sliding direction of the bending pressure roller 423 is parallel to the sliding direction of the feeding clamp 11. A support groove 4221 is provided on the outer wall of the support roller 422, and a bending groove 4231 is provided on the outer wall of the bending pressure roller 423. Both the support groove 4221 and the bending groove 4231 are annular to accommodate and position the bent part of the needle tube, completing the fit between the bending pressure roller 423 and the inner edge of the needle tube bend. When the bend angle detection device 41 detects that the bending angle of the needle tube does not meet the requirements due to springback, the compensation bending device 42 can bend the needle tube again to compensate for the springback error.
[0046] Reference Figure 5 and Figure 9 A distance sensor 43 is embedded in the inner wall of the support groove 4221 of the support roller 422. The distance sensor 43 faces the lifting unit 322 and is positioned close to the bending pressure roller 423 on the support roller 422. It is used to detect the distance between the support roller 422 and the needle tube. The distance sensor 43 is electrically connected to the third drive unit 8 and the first drive unit 12. After the distance sensor 43 detects that the distance between the support roller 422 and the needle tube remains unchanged, the first drive unit 12 stops, and the third drive unit 8 drives the sliding bracket 421 to slide, moving the support roller 422 until the inner wall of the support groove 4221 abuts against the inner edge of the bend of the needle tube. The distance sensor 43 controls the operation of the first drive unit 12 through the detected distance signal, further controlling the pushing distance of the needle tube after bending, and calibrating the alignment of the inner edge of the bend of the needle tube with the support roller 422 to ensure more accurate rebound compensation. In this embodiment, the distance sensor 43 can be an infrared ranging sensor.
[0047] In other embodiments, the distance sensor 43 may not be provided.
[0048] The implementation principle of this embodiment is as follows: After the needle tube is bent by the bending actuator 2, the operator rotates the needle tube circumferentially to remove the bent portion of the needle tube from the bending clamp 22. The clamping and pushing mechanism 1 pushes the needle tube according to the distance between the shaping column 212 and the support roller 422, so that the inner edge of the bend of the needle tube is aligned with the support roller 422, and the first drive unit 12 in the clamping and pushing mechanism 1 stops. The bend angle detection device 41 detects the bending angle of the needle tube and calculates the angular rebound amount of the needle tube according to the set bending angle of the bending actuator 2 and the actual angle of the needle tube after bending. Subsequently, the translation unit 321 of the stabilization mechanism 3 drives the lifting unit 322 to slide above the bent needle tube, the lifting support 3221 of the lifting unit 322 descends, and the stabilization clamp 31 clamps the needle tube. The compensating bending device 42 starts to work. Distance sensor 43 detects the distance between support roller 422 and needle tube. The third drive unit 8 drives sliding bracket 421 to slide according to the distance, bringing support roller 422 and bending pressure roller 423 closer to the needle tube until the inner wall of the support groove 4221 of support roller 422 abuts against the inner edge of the bend in the needle tube. Based on the previously calculated angle rebound amount, bending pressure roller 423 is driven to bend the needle tube a second time. The bend angle detection device 41 continues to monitor the bending angle of the needle tube, increasing the actual bending angle by a rebound compensation amount compared to the designed bending angle. After detecting the angle rebound amount of multiple needle tubes during processing, the average rebound amount of multiple needle tubes is calculated. Based on the average rebound amount, the bending angle of bending actuator 2 is adjusted again, increasing the adjusted bending angle by a rebound compensation amount compared to the designed bending angle. This ensures that the finished product obtained in subsequent processing meets expectations, eliminating the need for further rebound compensation of the needle tube in subsequent processing. After bending is complete, stabilization mechanism 3 directly transports the needle tube out.
[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A medical sample needle bending device, characterized in that, include: The clamping and pushing mechanism (1) includes a feeding clamp (11) and a first driving unit (12). The feeding clamp (11) includes a rotating clamping member, which is used to clamp the needle tube, limit the needle tube axially, and enable the needle tube to rotate circumferentially. The first driving unit (12) is used to drive the feeding clamp (11) to move the needle tube in translation. The bending actuator (2) includes a bending die (21), a bending clamp (22), and a second drive unit (23). The bending die (21) includes a shaping post (212). The bending clamp (22) is used to hold the part of the needle tube to be bent. The second drive unit (23) is used to drive the bending clamp (22) to rotate so that the needle tube bends along the shaping post (212). The bent part of the needle tube is moved out of the bending die (21) by the circumferential rotation of the needle tube. The springback compensation mechanism (4) includes a bend detection device (41) and a bend compensation device (42). The bend compensation device (42) includes a sliding bracket (421), a support roller (422) spaced apart on the sliding bracket (421), and a bending pressure roller (423). The support roller (422) is used to cooperate with the bend of the needle tube. The bending pressure roller (423) is used to abut against the bend of the needle tube. The mechanism also includes a fourth drive unit (9), which is used to drive the bending pressure roller (423) to push against the bend of the needle tube to complete the compensation. The clamping and pushing mechanism (1) is also used to drive the needle tube to move so that the inner edge of the bend of the needle tube is aligned with the support roller (422).
2. The medical sample needle bending device according to claim 1, characterized in that, The clamping and pushing mechanism (1) is further provided with a length positioning mechanism (6) at one end away from the bending actuator (2). The length positioning mechanism (6) includes a length fixing platform (61) and a locking rod (62) passing through the length fixing platform (61). The locking rod (62) is provided with a needle tail locking groove (621).
3. The medical sample needle bending device according to claim 2, characterized in that, The feeding fixture (11) includes a lifting source (111), an upper pressure block (112) and a lower pressure block (113) arranged opposite to each other. The lifting source (111) is used to drive the upper pressure block (112) and the lower pressure block (113) to slide relative to each other. The rotating clamping member includes a first rotating pressure bar (1121) and a second rotating pressure bar (1131). The first rotating pressure bar (1121) is rotatably connected to the upper pressure block (112) and is provided with an upper needle groove. The second rotating pressure bar (1131) is rotatably connected to the lower pressure block (113) and is provided with a lower needle groove. The upper needle groove and the lower needle groove are arranged opposite to each other.
4. The medical sample needle bending device according to claim 1, characterized in that, The bending die (21) also includes a die base (211), the shaping column (212) is rotatably connected to the die base (211), and the die base (211) is also provided with a needle channel; The bending clamp (22) includes a rotating base (221), a first telescopic source (222), and a first clamping block (223) and a second clamping block (224) disposed opposite to each other on the rotating base (221). The rotating base (221) is rotatably disposed, and the first telescopic source (222) is used to drive the second clamping block (224) to slide. The first clamping block (223) is provided with a first needle receiving groove (2231), and the second clamping block (224) is provided with a second needle receiving groove (2241), and the first needle receiving groove (2231) and the second needle receiving groove (2241) are arranged opposite to each other; The rotation axis of the bending clamp (22) is coaxial with the rotation axis of the shaping column (212).
5. A medical sample needle bending device according to claim 4, characterized in that, It also includes a corner positioning mechanism (7) disposed on one side of the bending actuator (2), the corner positioning mechanism (7) includes an angle fixing platform (71) and a positioning abutment (72), one end of the positioning abutment (72) is used to abut against the bending clamp (22); The positioning abutment (72) is movable on the angle fixing platform (71), and the positioning abutment (72) can be locked after it is moved.
6. A medical sample needle bending device according to claim 1, characterized in that, It also includes a stabilization mechanism (3), which includes a stabilization clamp (31) and a drive assembly (32). The stabilization clamp (31) is used to hold the needle tube, and the drive assembly (32) is used to drive the stabilization clamp (31) to move up, down and across. The drive assembly (32) includes a translation unit (321) and a lifting unit (322). The translation unit (321) is fixed above the bending actuator (2) and is used to drive the lifting unit (322) to slide. The lifting unit (322) includes a lifting support (3221), and the stabilizing clamp (31) is fixed on the lifting support (3221). The stabilizing clamp (31) includes a second telescopic source (311), a third clamping block (312), and a fourth clamping block (313). The second telescopic source (311) is used to drive the fourth clamping block (313) to slide. The third clamping block (312) is provided with a third needle groove (3121), and the fourth clamping block (313) is provided with a fourth needle groove (3131), and the third needle groove (3121) and the fourth needle groove (3131) are arranged opposite to each other.
7. A medical sample needle bending device according to claim 6, characterized in that, The outer wall of the support roller (422) is provided with a support groove (4221), and the outer wall of the bending pressure roller (423) is provided with a bending groove (4231). Both the support groove (4221) and the bending groove (4231) are annular and are designed to accommodate the needle tube.
8. A medical sample needle bending device according to claim 1, characterized in that, The first drive unit (12) includes a propulsion motor (121), and the second drive unit (23) includes a rotary motor; It also includes a current detection module and a servo control module. The current detection module is used to collect the drive current of the propulsion motor (121) and the rotating motor in real time. The servo control module is electrically connected to the propulsion motor (121) and the rotating motor.
9. A medical sample needle bending device according to claim 1, characterized in that, A distance sensor (43) is provided on the support roller (422) for detecting the distance between the support roller (422) and the needle tube; It also includes a third drive unit (8), which is used to drive the sliding bracket (421) to slide, and the distance sensor (43) is electrically connected to the first drive unit (12) and the third drive unit (8); After the distance sensor (43) detects that the distance between the support roller (422) and the needle tube remains unchanged, the first drive unit (12) stops, and the third drive unit (8) drives the sliding bracket (421) to slide.
10. A medical sample needle bending device according to claim 2, characterized in that, The needle tail snap-fit groove (621) includes a snap-fit groove section (6211) and a support groove section (6212) that are interconnected.