A fully automatic medical screw torque testing device

Abstract

This invention provides a fully automatic medical screw torque testing device, belonging to the field of medical bone implant screw torque testing technology, comprising: a housing; a main shaft and a clamping fixture arranged opposite to each other inside the housing; the clamping fixture being movable to approach the main shaft; a rotatable first annular disk on one side of the main shaft for storing the main shaft head; the main shaft head stored on the first annular disk, and a first conveying mechanism on one side for conveying the main shaft head; a rotatable second annular disk on one side of the clamping fixture; a clamping shaft stored on the second annular disk, and a second conveying mechanism on one side for conveying the clamping shaft; this invention utilizes a screw feeding mechanism, a first conveying mechanism, and a second conveying mechanism to achieve automatic loading and unloading, eliminating the need for manual screw clamping and judging the relative positions of various components, reducing human interference factors, improving testing efficiency, and making the test results more accurate.

Description

Technical Field

[0001] This invention relates to the field of medical bone implant screw torque testing technology, specifically to a fully automatic medical screw torque testing device. Background Technology

[0002] Medical screws are common orthopedic implants, primarily used to stabilize bones and promote healing by inserting screws into them. Screws may break during insertion, therefore, it is necessary to test their torque-related mechanical properties, such as fracture torque, fracture torsion angle, torsional stiffness, and torque failure. Currently, screw torque testing equipment typically uses a method where a human judges the screw-fitting screw tip, manually clamps the screw and the test screw onto the equipment, and simultaneously determines the screw's clamping position. This process is subject to many external uncertainties, requires manual screw clamping, and the clamping torque varies from person to person, easily damaging the threads and causing misalignment between the screw and the drive unit. Furthermore, it requires visual inspection of the exposed five turns of thread, resulting in significant human interference, low efficiency, and large deviations in experimental results. Therefore, this invention provides a fully automated medical screw torque testing device. Summary of the Invention

[0003] The purpose of this invention is to provide a fully automated medical torque testing device.

[0004] To solve the above-mentioned technical problems, the objective of this invention is achieved as follows:

[0005] A fully automatic medical screw torque testing device includes: a housing;

[0006] The housing includes a feed inlet and a discharge outlet, and is internally provided with a main shaft and a clamping fixture arranged opposite to each other; the clamping fixture is movable to approach the main shaft.

[0007] A rotatable first annular disk is provided on one side of the main shaft; several grooves are formed on the first annular disk; several different types of main shaft heads are stored in the grooves; a first conveying mechanism is provided inside the housing to convey the main shaft head back and forth between the first annular disk and the main shaft;

[0008] A rotatable second annular disk is provided on one side of the clamping fixture; the second annular disk has several grooves, and several clamping shafts are stored in the grooves; a second conveying mechanism is provided inside the housing to convey the clamping shafts back and forth between the second annular disk and the clamping fixture; a screw can be inserted into the center of the clamping shaft.

[0009] A liftable screw fixing plate is provided on the side of the second annular disc away from the clamping fixture, and the screw fixing plate is detachably disposed in the machine housing corresponding to the feed port; the screw fixing plate is provided with a plurality of evenly distributed screw holes; the screw is disposed in the screw holes;

[0010] A screw feeding mechanism is provided on one side of the screw fixing plate; the screw feeding mechanism includes a rotary clamping platform; the rotary clamping platform can clamp and drive the screw to rotate; the rotary clamping platform can move back and forth between the screw fixing plate and the second annular disk to drive the screw on the screw fixing plate to be inserted into the clamping shaft;

[0011] A first discharge plate is provided below the screw feeding mechanism; the first discharge plate is arranged at an inclination and is correspondingly located at the discharge port on one side of the machine housing; a second discharge plate is provided below the main shaft and a pushing mechanism is provided above it; the second discharge plate is arranged at an inclination and is correspondingly located at the discharge port on the other side of the machine housing; the pushing mechanism is used to push the screw on the main shaft head so that it falls onto the second discharge plate.

[0012] Based on the above scheme and as a preferred embodiment, one end of the main shaft is provided with a conical groove; two sliding grooves are symmetrically arranged along its axis inside the conical groove; an air supply pipe is connected to the tip of the conical groove to realize the pneumatic connection between the main shaft and the main shaft head; one end of the main shaft head is conical to fit the conical groove, and the other end is provided with a screw abutment rod; two sliding protrusions are provided on the outside of the conical shape to fit the sliding grooves; the end of the screw abutment rod is configured with a floral pattern to fit the groove inside the screw nut end.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme, the clamping shaft has a triangular cross-section and is composed of three clamping blocks with triangular cross-sections spliced ​​together, with a splicing screw hole in the center; the three clamping blocks are fixedly connected by an elastic band set on the outer surface of the clamping shaft, and an elastic strip is provided between two adjacent clamping blocks.

[0014] Based on the above scheme and as a preferred embodiment, the first conveying mechanism and the second conveying mechanism have the same structure, both including a main shaft and a conveying shaft; the main shaft is rotatable and movable back and forth inside the housing through a transfer mechanism; the plane of the conveying shaft is parallel to the plane of the first annular disk, one end is fixed to the end of the main shaft, and the other end is provided with an annular chuck; a pneumatically driven chuck is provided inside the annular chuck;

[0015] The transfer mechanism includes a collar, a first transport drive motor, and a second transport drive motor; the collar is splinedly connected to the main shaft; the first transport drive motor is used to drive the collar to rotate; and the second transport drive motor is used to drive the main shaft to move along its axis.

[0016] Based on the above solution and as a preferred embodiment, the screw fixing plate is vertically and rotatably mounted inside the housing via a lifting mechanism; the lifting mechanism includes a mounting base, a lifting slide rod, a lifting lead screw, and a lifting drive motor; the lifting slide rod is vertically fixed inside the housing; the lifting lead screw is vertically and rotatably mounted inside the housing and is located on one side of the lifting slide rod; the mounting base is slidably sleeved on the lifting slide rod and threadedly connected to the lifting lead screw; the screw fixing plate is detachably mounted on the mounting base; the lifting drive motor is used to drive the lifting lead screw.

[0017] Based on the above scheme and as a preferred embodiment of the above scheme, the screw feeding mechanism further includes a base; the screw clamping platform is movably mounted on the base via a lead screw mechanism, and the moving direction is towards or away from the second annular disk;

[0018] The base achieves lifting and horizontal movement through a screw mechanism; the direction of horizontal movement is perpendicular to the direction in which the rotary clamping platform approaches or moves away from the second annular disk.

[0019] Based on the above scheme and as a preferred embodiment of the above scheme, the outer circumferences of the first and second annular disks are configured as gears; rotation is achieved by a drive motor driven by the annular disks located inside the housing.

[0020] Based on the above scheme and as a preferred embodiment of the above scheme, the pushing mechanism is a pneumatic pushing mechanism, including an air outlet; the air outlet is located above the main shaft, is equipped with a control valve, and its end is connected to an air source.

[0021] Based on the above solution and as a preferred embodiment, a vision system is also included; the vision system includes an alignment sensor and a thread count determination camera system; the alignment sensor is disposed on the spindle and the clamping fixture for alignment between the two; the thread count determination system is disposed below the clamping fixture for identifying the number of screw turns exposed on the clamping shaft thread.

[0022] The beneficial effects of this invention are: This invention utilizes a screw feeding mechanism, a first conveying mechanism, and a second conveying mechanism to achieve automatic loading and unloading, eliminating the need for manual screw clamping and judging the relative positions of each component, reducing human interference factors, improving test efficiency, and making the test results more accurate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of the casing of the present invention.

[0025] Figure 3 This is a schematic diagram of the lifting mechanism of the present invention.

[0026] Figure 4 This is a schematic diagram of the first and second annular disks of the present invention.

[0027] Figure 5 This is a schematic diagram of the rotating clamping platform and screw fixing plate structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the clamping fixture and rotary clamping table structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the clamping fixture structure of the present invention.

[0030] Figure 8 This is a schematic diagram of the spindle and spindle head structure of the present invention.

[0031] In the diagram: 1. Machine housing; 2. Feed inlet; 3. Discharge outlet; 4. Main shaft; 41. Conical groove; 42. Slide groove; 44. Screw abutment rod; 45. Sliding protrusion; 5. Clamping fixture; 6. First annular disc; 61. Main shaft; 62. Transport shaft; 63. Annular chuck; 64. Collar; 65. First transport drive motor; 66. Second transport drive motor; 7. Main shaft head; 8. Second annular disc; 81. Annular disc drive motor; 9. Clamping shaft; 91. Clamping block; 92. Splicing screw hole; 93. Elastic band; 94. Elastic strip; 10. Screw; 11. Screw fixing plate; 111. Mounting base; 112. Lifting slide rod; 113. Lifting lead screw; 114. Lifting drive motor; 12. Rotary clamping table; 121. Base; 13. First discharge plate; 14. Second discharge plate; 15. Air outlet. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 and Figure 2 As shown, a fully automatic medical screw torque testing device includes: a housing 1, which includes an inlet 2 and an outlet 3, and has a main shaft 4 and a clamping fixture 5 arranged opposite to each other inside. The clamping fixture 5 is movable to approach the main shaft 4.

[0034] A rotatable first annular disk 6 is provided on one side of the main spindle 4. The first annular disk 6 has several evenly distributed grooves, and several spindle heads 7 of different models are stored in the grooves. A first conveying mechanism is provided inside the housing 1 to move the spindle heads 7 back and forth between the first annular disk 6 and the main spindle 4.

[0035] Among them, such as Figure 8As shown, one end of the spindle 4 is provided with a tapered groove 41, and two sliding grooves 42 are symmetrically arranged along its axis inside the tapered groove 41. An air supply pipe is connected to the tip of the tapered groove 41 to achieve a pneumatic connection between the spindle 4 and the spindle head 7. One end of the spindle head 7 is tapered and fits into the tapered groove 41, while the other end is provided with a screw abutment rod 44. Two sliding protrusions 45 are provided on the outside of the tapered shape and fit into the sliding grooves 42. The end of the screw abutment rod 44 is designed with a floral pattern to fit into the groove inside the nut end of the screw 10, to meet the testing requirements of different screws 10. The pneumatic connection utilizes negative pressure adsorption, has a simple structure, is easy to connect, and facilitates the replacement of the spindle head 7. The sliding protrusions 45 and sliding grooves 42 facilitate the positioning of the spindle head 7 and the spindle 4.

[0036] A rotatable second annular disk 8 is provided on one side of the clamping fixture 5. The second annular disk 8 has several evenly distributed grooves, each containing a clamping shaft 9. A second conveying mechanism is provided inside the housing 1 to move the clamping shafts 9 back and forth between the second annular disk 8 and the clamping fixture 5. A screw hole is provided at the center of each clamping shaft 9 for inserting a screw 10.

[0037] Preferably, such as Figure 7 As shown, the clamping shaft 9 has a triangular cross-section and is composed of three clamping blocks 91 with triangular cross-sections, with a connecting screw hole 92 in the center. The three clamping blocks 91 are fixedly connected by elastic bands 93 on the outer surface of the clamping shaft 9, and an elastic strip 94 is provided between adjacent clamping blocks 91. An elastic band groove is provided on the outside of the clamping shaft 9, and the elastic band 93 is disposed in the groove. An elastic strip 94 groove is provided on the side of each clamping block 91 facing the other two clamping blocks 91, and the elastic strip 94 abuts against the groove between the two clamping blocks 91. Due to the presence of the elastic bands 93 and the elastic strip 94, the clamping blocks 91 are elastically connected, preventing the screw 10 from breaking inside the clamping shaft 9 due to rigidity. The screw 10 is clamped using the connecting screw hole 92, resulting in a good clamping effect while preventing damage to the threads of the clamp.

[0038] like Figure 4 As shown, the first and second conveying mechanisms have the same structure, both including a main spindle 61 and a conveying shaft 62. The main spindle 61 is rotatably and movable back and forth inside the housing 1 via a transfer mechanism. The plane of the conveying shaft 62 is parallel to the plane of the first annular disk 6, with one end fixed to the end of the main spindle 61 and the other end equipped with an annular chuck 63. A pneumatically driven chuck is installed inside the annular chuck 63. During conveying, the transfer mechanism drives the main spindle 61 and the conveying shaft 62 to move, and the annular chuck 63 clamps the main spindle head 7 or the clamping shaft 9, driving the main spindle head 7 and the clamping shaft 9 back and forth between the annular disk and the main spindle 4 or the clamping fixture 5.

[0039] The transfer mechanism includes a collar 64, a first transfer drive motor 65, and a second transfer drive motor 66. The collar 64 is slidably and splinedly connected to the main shaft 61. The first transfer drive motor 65 drives the collar 64 to rotate, which in turn drives the main shaft 61 to rotate. The second transfer drive motor 66 drives the main shaft 61 to move back and forth along its axis. During operation, the second transfer drive motor 66 operates, driving the main shaft 61 and the transfer shaft 62 to move forward. Then, the first transfer drive motor 65 operates, driving the collar 64 to rotate. The collar 64 drives the main shaft 61 to rotate, causing the annular chuck 63 of the transfer shaft 62 to rotate to the annular disk. Afterward, it moves backward to enclose the main shaft head 7 or the clamping shaft 9, and then the chuck clamps it. Then, the main shaft 61 and the transfer shaft 62 move forward and rotate to the main shaft head 4 or the clamping fixture 5, and then move backward to connect the main shaft head 7 with the main shaft 4 / the clamping shaft 9 with the clamping fixture 5.

[0040] The outer circumferences of the first annular disk 6 and the second annular disk 8 are configured as gears, and the annular disks inside the housing 1 drive the motor 81 to rotate.

[0041] A liftable screw fixing plate 11 is provided on the side of the second annular disc 8 away from the clamping fixture 5, and the screw fixing plate 11 is detachably installed inside the machine housing 1 corresponding to the feed port 2. The screw fixing plate 11 is provided with a number of evenly distributed screw holes, and screws 10 are disposed in the screw holes.

[0042] The screw fixing plate 11 is movably mounted inside the housing 1 via a lifting mechanism. Figure 3 As shown, the lifting mechanism includes a mounting base 111, a lifting slide rod 112, a lifting screw 113, and a lifting drive motor 114. The lifting slide rod 112 is vertically fixed inside the housing 1, and the lifting screw 113 is vertically and rotatably mounted inside the housing 1, located on one side of the lifting slide rod 112. The mounting base 111 is slidably sleeved on the lifting slide rod 112 and threadedly connected to the lifting screw 113. A screw fixing plate 11 is detachably mounted on the mounting base 111. The lifting drive motor 114 drives the lifting screw 113 to rotate, which in turn causes the mounting base 111 to rise and fall, and the screw fixing plate 11 rises and falls synchronously with the mounting base 111. A door is provided at the feed inlet 2 for protection. In use, the screw fixing plate 11 is removed through the feed inlet 2, several screws 10 are fixed to the screw fixing plate 11, and then it is reinstalled on the mounting base 111.

[0043] A screw feeding mechanism is provided on one side of the screw fixing plate 11 to transport the screw 10 from the screw fixing plate 11 to the clamping shaft 9 on the second annular disk 8. The screw feeding mechanism includes a rotary clamping table 12, which can clamp and drive the screw 10 to rotate. Figure 5 and Figure 6As shown, the rotating clamping platform 12 can move back and forth between the screw fixing plate 11 and the second annular disk 8 to drive the screw 10 on the screw fixing plate 11 to be inserted into the clamping shaft 9.

[0044] Specifically, the screw feeding mechanism also includes a base 121. The rotary clamping platform 12 is movably mounted on the base 121 via a lead screw mechanism, and its movement direction is towards or away from the second annular disk 8. The lead screw mechanism includes a lead screw, a motor, and a slide rail. The motor drives the lead screw to rotate, and the rotation of the lead screw causes the rotary clamping platform 12 to move along the slide rail, thereby realizing the movement of the rotary clamping platform 12.

[0045] The base 121 achieves lifting and horizontal movement via a lead screw mechanism. The direction of horizontal movement is perpendicular to the direction in which the rotary clamping platform 12 approaches or moves away from the second annular disk 8.

[0046] During operation, the rotary clamping table 12 moves forward to approach the screw fixing plate 11, clamps the screw 10 and rotates it to disengage it from the screw of the screw fixing plate 11, and then moves to the second annular disk 8 to screw the screw 10 into the screw hole of the clamping shaft 9 thereon.

[0047] A first discharge plate 13 is located below the screw feeding mechanism. The first discharge plate 13 is inclined and corresponds to the discharge port 3 on one side of the machine housing 1. A second discharge plate 14 is located below the main shaft 4, and a pushing mechanism is located above it. The second discharge plate 14 is inclined and corresponds to the discharge port 3 on the other side of the machine housing 1. The pushing mechanism is used to push the screw 10 on the main shaft head 7 so that it falls onto the second discharge plate 14. After the test is completed, the screw waste needs to be removed. The inclined discharge plate 13 can transport the fallen screw waste to the discharge port 3.

[0048] Preferably, the pushing mechanism is a pneumatic pushing mechanism, including an air outlet 15; the air outlet 15 is located above the main shaft 4, is equipped with a control valve, and its end is connected to an air source.

[0049] When screw 10 breaks, one section remains in clamping shaft 9, and the other section is connected to screw abutment rod 44. The section remaining in clamping shaft 9 is clamped by rotating clamping table 12 and unscrewed, falling onto the first discharge plate 13; the section connected to screw abutment rod 44 is blown into the second discharge plate 14 by pneumatic ejection mechanism.

[0050] Furthermore, this device also includes a vision system. The vision system includes an alignment sensor and a thread count determination camera system. The alignment sensor is mounted on the spindle 4 and the clamping fixture 5 for alignment between the two. The thread count determination system is located below the clamping fixture 5 to identify the number of threads of the screw 10 exposed on the clamping shaft 9, ensuring that the screw 10 meets the testing standards.

[0051] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A fully automatic medical screw torque testing device, characterized in that, include: Casing (1); The housing (1) includes a feed inlet (2) and a discharge outlet (3), and is provided with a main shaft (4) and a clamping fixture (5) arranged opposite to each other inside; the clamping fixture (5) is movable to approach the main shaft (4); A rotatable first annular disk (6) is provided on one side of the main shaft (4); a number of grooves are provided on the first annular disk (6); a number of different types of main shaft heads (7) are stored in the grooves; a first conveying mechanism is provided inside the housing (1) to convey the main shaft head (7) back and forth between the first annular disk (6) and the main shaft (4); The clamping fixture (5) has a rotatable second annular disk (8) on one side; the second annular disk (8) has several grooves, and several clamping shafts (9) are stored in the grooves; the housing (1) has a second transport mechanism to transport the clamping shafts (9) back and forth between the second annular disk (8) and the clamping fixture (5); a screw (10) can be inserted into the center of the clamping shaft (9); A liftable screw fixing plate (11) is provided on the side of the second annular disk (8) away from the clamping fixture (5), and the screw fixing plate (11) is detachably disposed in the housing (1) corresponding to the feed port (2); the screw fixing plate (11) is provided with a plurality of evenly distributed screw holes; the screw (10) is disposed in the screw holes; A screw feeding mechanism is provided on one side of the screw fixing plate (11); the screw feeding mechanism includes a rotating clamping table (12); the rotating clamping table (12) can clamp and drive the screw (10) to rotate; the rotating clamping table (12) can move back and forth between the screw fixing plate (11) and the second annular disk (8) to drive the screw (10) on the screw fixing plate (11) to be inserted into the clamping shaft (9); A first discharge plate (13) is provided below the screw feeding mechanism; the first discharge plate (13) is arranged at an inclination and is correspondingly provided at the discharge port (3) on one side of the housing (1); a second discharge plate (14) is provided below the main shaft (4) and a pushing mechanism is provided above it; the second discharge plate (14) is arranged at an inclination and is correspondingly provided at the discharge port (3) on the other side of the housing (1); the pushing mechanism is used to push the screw (10) on the main shaft head (7) so that it falls onto the second discharge plate (14).

2. The fully automatic medical screw torque testing device according to claim 1, characterized in that, One end of the main shaft (4) is provided with a conical groove (41); two sliding grooves (42) are symmetrically arranged along its axis inside the conical groove (41); the tip of the conical groove (41) is connected to an air supply pipe to realize the pneumatic connection between the main shaft (4) and the main shaft head (7); one end of the main shaft head (7) is conical and adapted to the conical groove (41), and the other end is provided with a screw abutment rod (44); two sliding protrusions (45) are provided on the outside of the conical shape and adapted to the sliding groove (42); the end of the screw abutment rod (44) is set with a flower pattern adapted to the groove inside the nut end of the screw (10).

3. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The clamping shaft (9) has a triangular cross section and is composed of three clamping blocks (91) with triangular cross sections spliced ​​together, with a splicing screw hole (92) in the center; the three clamping blocks (91) are fixedly connected by an elastic band (93) set on the outer surface of the clamping shaft (9), and an elastic strip (94) is provided between two adjacent clamping blocks (91).

4. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The first conveying mechanism and the second conveying mechanism have the same structure, both including a main shaft (61) and a conveying shaft (62); the main shaft (61) is rotatable and movable back and forth inside the housing (1) through a transfer mechanism; the plane of the conveying shaft (62) is parallel to the plane of the first annular disk (6), one end is fixed to the end of the main shaft (61), and the other end is provided with an annular chuck (63); the annular chuck (63) is provided with a pneumatically driven chuck; The transfer mechanism includes a collar (64), a first transport drive motor (65), and a second transport drive motor (66); the collar (64) is splinedly connected to the main shaft (61); the first transport drive motor (65) is used to drive the collar (64) to rotate; the second transport drive motor (66) is used to drive the main shaft (61) to move along its axis.

5. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The screw fixing plate (11) is vertically and flexibly mounted inside the housing (1) via a lifting mechanism; the lifting mechanism includes a mounting base (111), a lifting slide rod (112), a lifting screw (113), and a lifting drive motor (114); the lifting slide rod (112) is vertically fixed inside the housing (1); the lifting screw (113) is vertically and rotatably mounted inside the housing (1) and is located on one side of the lifting slide rod (112); the mounting base (111) is slidably sleeved on the lifting slide rod (112) and threadedly connected to the lifting screw (113); the screw fixing plate (11) is detachably mounted on the mounting base (111); the lifting drive motor (114) is used to drive the lifting screw (113).

6. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The screw feeding mechanism also includes a base (121); the screw clamp (12) is movably mounted on the base (121) via a screw mechanism, and the moving direction is towards or away from the second annular disk (8); The base (121) achieves lifting and horizontal movement through a screw mechanism; the direction of the horizontal movement is perpendicular to the direction in which the rotary clamp (12) approaches or moves away from the second annular disk (8).

7. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The outer circumference of the first annular disk (6) and the second annular disk (8) is configured as gears; the rotation is achieved by a drive motor (81) driven by the annular disk located inside the housing (1).

8. The fully automatic medical screw torque testing device according to claim 1, characterized in that, The pushing mechanism is a pneumatic pushing mechanism, including an air outlet (15); the air outlet (15) is located above the main shaft (4), and is equipped with a control valve, with its end connected to an air source.

9. The fully automatic medical screw torque testing device according to claim 1, characterized in that, It also includes a vision system; the vision system includes an alignment sensor and a thread count determination camera system; the alignment sensor is mounted on the spindle (4) and the clamping fixture (5) for alignment between the two; The thread count determination system is located below the clamping fixture (5) and is used to identify the number of threads of the screw (10) exposed on the clamping shaft (9).

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