An environmental simulation type implant fatigue test device

Abstract

The present invention discloses an environmental simulation type implant fatigue testing device, belonging to the technical field of medical device testing. It includes a substrate, on which a device main body is arranged. The device main body includes a vibration driving member, an upper fixing mechanism, a lower fixing mechanism and a lift. The upper fixing mechanism is connected to the lower part of the substrate, the lower fixing mechanism is connected to the vibration driving member and is located below the upper fixing mechanism, and an implant test piece is connected between the upper fixing mechanism and the lower fixing mechanism; a base arranged below the substrate, on which an environmental simulation box for simulating the environment where the implant is located is arranged; and two main guiding columns symmetrically arranged, which are arranged between the substrate and the base, and the symmetry axis thereof passes through the center of gravity of the substrate and the device main body. The substrate is lifted and lowered along the main guiding columns driven by the lift so that the implant test piece can enter and exit the environmental simulation box. The present invention improves the stability of the substrate lifting by arranging the main guiding columns.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device testing, and particularly to an environmental simulation type implant fatigue testing device. Background Art

[0002] Implant fatigue testing devices are used to perform cyclic deformation durability tests on various types of surgical implants (such as heart valves, vascular valves, vascular stents, vascular linings, occluders, etc.), aiming to provide repeated loading conditions to test samples during operation to simulate the typical or specific physiological load conditions of artificial blood vessels, heart artificial valves, or other implants over time, so as to determine the efficacy, elasticity, and wear of the devices.

[0003] Taking a vascular stent as an example, the cyclic deformation durability tests related to the vascular stent include: axial tension and compression, bending, torsion, radial expansion and contraction. Among them, the bending test includes axial compression bending, mandrel bending, and coreless arc bending. As Figure 1 shown, in the axial compression bending test, after the stent 1 is released in the simulated blood vessel 2, the simulated blood vessel 2 is fixed to a set of bending fixing devices 3, and these bending fixing devices 3 can rotate the ends of the simulated blood vessel 2. The bending fixing devices 3 are installed on a device that can continuously transmit periodic axial motion to the simulated blood vessel 2. When the distance between the two bending fixing devices 3 shortens, the ends of the simulated blood vessel 2 will rotate, and the simulated blood vessel 2 loaded with the stent 1 will bend to a certain radius of curvature, thereby testing the axial compression bending durability of the stent 1.

[0004] Implants are mostly used inside the human body, and the environment is different from the conventional laboratory environment. Therefore, an environmental simulation chamber is required. During testing, a lifting device is generally used to place the fixing device and the implant test piece inside the environmental simulation chamber, but there are still problems in ensuring the stability of the device during the lifting process.

[0005] The foregoing description is provided to give general background information and does not necessarily constitute prior art. Summary of the Invention

[0006] The present invention aims to provide an environmental simulation type implant fatigue testing device to overcome the deficiencies in the prior art.

[0007] To solve the above technical problems, the technical solution of the present invention is:

[0008] An environmental simulation type implant fatigue testing device, comprising:

[0009] A substrate, on which a device main body is provided. The device main body includes a vibration driving member, an upper fixing mechanism, a lower fixing mechanism, and a lift. The upper fixing mechanism is connected to the lower side of the substrate. The lower fixing mechanism is connected to the vibration driving member and is located below the upper fixing mechanism. An implant test piece is connected between the upper fixing mechanism and the lower fixing mechanism.

[0010] A base disposed below the substrate, on which an environment simulation box for simulating the environment where the implant is located is provided; and,

[0011] Two main guiding columns symmetrically arranged, which are disposed between the substrate and the base, and the symmetry axis thereof passes through the centers of gravity of the substrate and the device main body. The substrate is driven by the lift to move up and down along the main guiding columns so that the implant test piece can enter and exit the environment simulation box.

[0012] Preferably, a top plate adapted to the environment simulation box is connected to the lower side of the substrate, and the top plate is driven by the substrate to cover or disengage from the environment simulation box.

[0013] Preferably, the environment simulation box is provided with a detachable front panel and / or rear panel.

[0014] Preferably, the device main body further includes a clamping mechanism. One end of the main guiding column penetrates through the substrate and is connected to it through the clamping mechanism, and the other end is connected to the base. The clamping mechanism includes a clamping seat and a fastener. The clamping seat is connected to the substrate. The clamping seat includes a machine mounting portion and a column mounting portion arranged side by side. The lift is disposed within the machine mounting portion. The main guiding column is inserted into the column mounting portion, and the column mounting portion clamps or loosens the main guiding column through a fastener that can be tightened or loosened.

[0015] Preferably, the column mounting portion includes a clamping block I and a clamping block II, and the fastener passes through the clamping block II and is connected to the clamping block I, and the clamping block I and the clamping block II clamp and hold the main guiding column through the tightening of the fastener.

[0016] Preferably, the main guiding column is a circular column, and arc grooves are provided on the opposite sides of the clamping block I and the clamping block II to form a clamping hole for holding the main guiding column.

[0017] Preferably, the lift is a lead screw lift, and the lead screw in the lead screw lift is disposed between the substrate and the base and is parallel to the main guiding column.

[0018] Preferably, the vibration driving member is a linear motor or an electromagnetic vibrator, and the vibration driving member is vertically disposed.

[0019] Preferably, the driving end of the vibration driving member is connected to a vibration shaft seat, a main vibration shaft is arranged on the vibration shaft seat, the main vibration shaft vertically passes through the substrate and is connected to the lower fixing mechanism, the vibration driving member drives the main vibration shaft to vibrate up and down through the vibration shaft seat, a cache mechanism is arranged on the side of the vibration shaft seat, the cache mechanism includes two cache springs arranged coaxially with the main vibration shaft, one cache spring is arranged above the vibration shaft seat, and the other end abuts against the positioning member, and the other cache spring is arranged below the vibration shaft seat, and the other end abuts against the other positioning member.

[0020] Preferably, the main vibration shaft is arranged in parallel with the driving end of the vibration driving member, or the main vibration shaft is arranged coaxially with the driving end of the vibration driving member.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention improves the stability of substrate lifting by lifting the substrate along the main guide columns, and the symmetry axes of the two main guide columns pass through the center of gravity of the substrate and the equipment body; further, the substrate lifted to the specified position is clamped with the main guide columns by the clamping mechanism on the main guide columns, thereby preventing the substrate from falling due to damage to the elevator and improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of an axial compression bending test of a vascular stent in the prior art;

[0025] Figure 2 It is a three-dimensional enlarged schematic diagram of the implant fatigue testing device of the present invention in Example 1;

[0026] Figure 3 This is an exploded schematic diagram of the housing of the present invention in Example 1;

[0027] Figure 4 It is a structural schematic diagram of the working unit of the present invention in Example 1;

[0028] Figure 5 Schematic diagram of the structure of the vibration driving member of the present invention in Example 1;

[0029] Figure 6 Another structural schematic diagram of the vibration driving member of the present invention;

[0030] Figure 7 Schematic structural diagram of the lifting drive member and the elevator of the present invention in Embodiment 1;

[0031] Figure 8 Schematic structural diagram of the clamping mechanism of the elevator of the present invention in Embodiment 1;

[0032] Figure 9 Schematic structural diagram of the clamping seat of the present invention in Embodiment 1;

[0033] Figure 10 Explosion schematic diagram of the base of the present invention in Embodiment 1;

[0034] Figure 11 Stereo enlarged schematic diagram of the test fixing device of the present invention in Embodiment 1;

[0035] Figure 12 Schematic structural diagram of the force value sensor and its fixture of the present invention in Embodiment 1;

[0036] Figure 13 Explosion schematic diagram of the force value sensor and its fixture of the present invention in Embodiment 1;

[0037] Figure 14 Stereo enlarged schematic diagram of the implant fatigue test equipment of the present invention in Embodiment 2;

[0038] Figure 15 Another angle stereo enlarged schematic diagram of the implant fatigue test equipment of the present invention in Embodiment 2;

[0039] Figure 16 Cross-sectional schematic diagram of the implant fatigue test equipment of the present invention in Embodiment 2.

[0040] Specifically, 1. Bracket; 2. Simulated blood vessel; 3. Bending fixing device;

[0041] 100. Machine shell; 110. Front cover frame; 111. Front cover plate; 120. Rear cover frame; 121. Rear cover plate; 130. Upper left side beam; 131. Left cover plate; 1311. Left ventilation area; 140. Upper right side beam; 141. Right cover plate; 1411. Right ventilation area; 151. Upper cover plate; 152. Drag chain seat plate;

[0042] 200. Substrate; 210. Adapter flange;

[0043] 300. Main guiding column; 301. Hoisting ring hole; 310. Support plate; 320. Main guiding sliding sleeve; 330. Locking nut; 331. Flat washer; 332. Wave washer;

[0044] 400, Base; 410, Bottom Plate; 420, Wire Passing Base; 421, Electrical Interface Box; 422, Male Connector Base; 430, Rubber Pad; 440, Auxiliary Beam; 441, Groove;

[0045] 500, Vibration Driving Part; 501, Vertical Seat; 502, Fixed Seat; 503, Sliding Seat; 504, Magnetic Spring Fixing Plate; 505, Vibration Shaft Seat;

[0046] 510, Main Vibration Shaft; 511, Upper Guide Sliding Sleeve; 512, Lower Guide Sliding Sleeve;

[0047] 520, Buffer Spring; 521, Guide Post; 522, Positioning Part;

[0048] 600, Lifting Driving Part; 610, Lifter; 611, Lead Screw; 620, Clamping Mechanism; 621, Clamping Seat; 6211, Machine Installation Groove; 6212, Clamping Block Ⅰ; 6213, Clamping Block Ⅱ; 6214, Clamping Hole; 6215, Buffer Groove Ⅰ; 6216, Buffer Groove Ⅱ; 6217, Fastening Hole; 622, Top Cover;

[0049] 700, Controller;

[0050] 800, Upper Fixing Mechanism; 801, Hanging Rack Plate Ⅰ; 802, Hanging Rack Plate Ⅱ; 803, Hanging Rack Plate Ⅲ; 810, Force Value Sensor; 811, Slide Post; 8111, Threaded Section; 812, Adjusting Nut; 813, Mounting Seat; 8131, Connection Hole; 820, Lower Fixing Mechanism; 821, Sub - Vibration Shaft; 822, Lower Fixture;

[0051] 900, Environmental Simulation Chamber; 910, Top Plate. Detailed Implementation Manner

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0055] Embodiment 1:

[0056] As Figure 2 shown, an implant fatigue test device includes a device main body, and the device main body includes a working unit. The working unit is installed in a housing 100 on a substrate 200. A upper fixing mechanism 800 is connected below the substrate 200. A lower fixing mechanism 820 is arranged below the upper fixing mechanism 800, and the lower fixing mechanism 820 is connected to the working unit. The implant test piece is clamped between the upper fixing mechanism 800 and the lower fixing mechanism 820. The working unit drives the lower fixing mechanism 820 to vibrate up and down relative to the upper fixing mechanism 800 to realize the test of the implant test piece. The substrate 200 is suspended above a base 400 through two main guiding columns 300 and lead screws 611 respectively arranged on both sides thereof, providing space for the installation of the upper fixing mechanism 800 and the lower fixing mechanism 820, and the symmetry axes of the two main guiding columns 300 pass through the centers of gravity of the substrate 200 and the device main body.

[0057] As Figure 3As shown, the casing 100 adopts a modular splicing structure, so that it can be selectively disassembled according to maintenance requirements without overall disassembly. Specifically, the casing 100 includes a front cover frame 110 and a rear cover frame 120 which are oppositely arranged. The front cover frame 110, the rear cover frame 120 and the substrate 200 are all detachably connected by screws. An upper left side beam 130 and an upper right side beam 140 are detachably arranged between the front cover frame 110 and the rear cover frame 120 by screws. The casing 100 forms a frame main structure through the front cover frame 110, the rear cover frame 120, the upper left side beam 130 and the upper right side beam 140. And a front cover plate 111, a rear cover plate 121, a left cover plate 131, a right cover plate 141 and an upper cover plate 151 are detachably connected to the frame main structure by screws, so that each cover plate, the front cover frame 110, the rear cover frame 120, the upper left side beam 130 and the upper right side beam 140 can be disassembled separately, and thus can be selectively disassembled according to maintenance requirements, enabling maintenance personnel to maintain the corresponding working machine inside it, without overall disassembly. And through the frame structure with greater strength, the casing 100 is made stable. At the same time, relatively speaking, the cover plates can adopt thin plates, so that the casing 100 is lighter in weight.

[0058] Generally speaking, the cover plates adopt a connection method of being embedded in the frame main structure, so that the surface of the casing 100 is as flat as possible. And the working machine that needs to be frequently maintained is installed close to the front cover plate 111, so that only the front cover plate 111 needs to be disassembled during routine maintenance. To further facilitate disassembly, through threaded holes are provided at the bottom and top of the front cover frame 110 for screws to pass through to be respectively connected to the bottom and top of the front cover plate 111. The two threaded holes are coaxially and oppositely arranged. During installation, first, the bottom of the front cover frame 110 is fixed to the substrate 200 by screws, then the front cover plate 111 is embedded into the front cover frame 110, and then the screws pass through the top of the front cover frame 110 to be connected to the top of the front cover plate 111, and the screws pass through the bottom of the front cover frame 110 to be connected to the bottom of the front cover plate 111, so that the front cover plate 111 is fixed inside the front cover frame 110 through its upper and lower sides, which is convenient for disassembly and assembly. And when the screws become loose due to vibration, the upper screws can stay in the holes like pins due to gravity and will not fall off, thus improving the safety of the equipment. The remaining cover plates, such as the rear cover plate 121, the left cover plate 131, the right cover plate 141 and the upper cover plate 151, are connected to the frame main structure by screws at the edges. Left ventilation areas 1311 and right ventilation areas 1411 are respectively arranged on the left cover plate 131 and the right cover plate 141. The left ventilation areas 1311 and the right ventilation areas 1411 are diagonally distributed, so as to facilitate air flow through the inside of the entire casing 100 to achieve uniform heat dissipation.

[0059] The working machine set is arranged on the substrate 200 and is covered inside the casing 100. In this embodiment, as Figure 4As shown, the working unit includes a vibration driver 500 and a transmission assembly thereof. The vibration driver 500 provides power for the relative movement of the upper fixing mechanism 800 and the lower fixing mechanism 820. The working unit also includes a lifting driver 600 and a transmission assembly thereof, and the lifting driver 600 provides power for the lifting of the substrate 200, thereby adjusting the height position of the upper fixing mechanism 800 and the lower fixing mechanism 820. The working unit may also include a controller 700, which is connected to the vibration driver 500 and the lifting driver 600 to control the operation of both.

[0060] The vibration driving member 500 of the present device is connected with a main vibration shaft 510. The main vibration shaft 510 is arranged vertically through the substrate 200, and the upper fixing mechanism 800 is fixed to the substrate 200, and the lower fixing mechanism 820 is connected to the main vibration shaft 510. The vibration driving member 500 drives the main vibration shaft 510 to vibrate up and down, thereby driving the lower fixing mechanism 820 to vibrate up and down relative to the upper fixing mechanism 800. The vibration driving member 500 can be a linear motor or an electromagnetic vibrator, a magnetostrictive vibrator, an electric or non-electric mechanical vibration device, etc., preferably a voice coil motor. The proximal end of the main vibration shaft 510 is sleeved with an upper guide sleeve 511, and the distal end is sleeved with a lower guide sleeve 512. Through double-point support, the stability and axial retention of the main vibration shaft 510 moving up and down are improved. Specifically, the upper guide sleeve 511 is fixed to the substrate 200, and the lower guide sleeve 512 is fixed to the upper fixing mechanism 800.

[0061] In order to ensure the smooth operation of the main vibration shaft 510, the center of gravity of the substrate 200 and the device body is located on the axis of the main vibration shaft 510, that is, the substrate 200 and the device body as a whole have their center of gravity located on the axis of the main vibration shaft 510, and the moving trajectory of the main vibration shaft 510 is in the same straight line as the overall center of gravity in the vertical direction, without eccentric torque, thereby making the main vibration shaft 510 run more smoothly and avoiding unnecessary shaking of the main vibration shaft 510, thereby improving the test accuracy and extending the service life of the equipment.

[0062] like Figure 5 As shown, in this embodiment, the vibration driving member 500 is arranged vertically, that is, perpendicular to the base plate 200, which reduces the occupied area, reduces the transmission components, and improves the space utilization rate of the equipment. In order to install the vibration driving member 500, a stand 501 is arranged on the base plate 200, and the stand 501 includes a back plate arranged perpendicular to the base plate 200, and an upper plate is arranged horizontally on the top of the back plate. The vibration driving member 500 is fixed to the upper plate, and the driving end faces downward. Ribs are also arranged on both sides of the stand 501 to improve the overall strength, thereby improving the stability of the operation of the vibration driving member 500.

[0063] The driving end of the vibration driving member 500 is connected to a vibration shaft seat 505. The vibration shaft seat 505 is connected to the main vibration shaft 510. The main vibration shaft 510 penetrates through the substrate 200 and then is connected to the lower fixing mechanism 820. A fixing seat 502 is also provided on the vertical seat 501. The driving end of the vibration driving member 500 is connected to a sliding seat 503 that is slidably connected to the fixing seat 502. The vibration shaft seat 505 is provided on the sliding seat 503, so as to realize that the vibration driving member 500 drives the main vibration shaft 510 to move stably up and down, improve the stability of the periodic axial movement of the main vibration shaft 510, and further improve the test accuracy.

[0064] In this embodiment, the fixing seat 502 is located directly below the vibration driving member 500. The sliding seat 503 is adopted. One end of the sliding seat 503 is connected to the driving end, and the other end is connected to the vibration shaft seat 505, so that the sliding seat 503 can be as thin as possible, thereby reducing the load at the driving end and improving the running stability of the vibration driving member 500. At the same time, this setting makes the main vibration shaft 510 and the driving end of the vibration driving member 500 arranged in parallel, that is, the vibration shaft driving member, the main vibration shaft 510 and the buffer mechanism are arranged side by side in sequence, so as to facilitate the maintenance of different components, and multiple components are arranged horizontally in sequence, which is beneficial to reducing the height of the device.

[0065] A cross track 507 may be provided between the sliding seat 503 and the fixing seat 502. The cross track 507 is also called a cross roller track or a cross roller track. One track in the cross track 507 is provided on the sliding seat 503, and the other track is provided on the fixing seat 502, thereby improving the reciprocating linear motion accuracy of the sliding seat 503, and further improving the test accuracy. And in this embodiment, a convex rib is provided on the side surface of the fixing seat 502, one track of the cross track 507 is provided on both sides of the convex rib, a groove is provided on the corresponding surface of the sliding seat 503, and the other track of the cross track 507 is provided on both sides of the groove, so as to realize bilateral sliding, improve the reciprocating linear motion accuracy of the sliding seat 503, and at the same time improve the strength of the connection between the two, improve the motion stability, and further improve the test accuracy.

[0066] A magnetic spring fixing plate 504 is also provided on the fixing seat 502 or the vertical seat 501. In this embodiment, the magnetic spring fixing plate 504 is provided on the fixing seat 502. A magnetic spring is provided on the magnetic spring fixing plate 504. The stator of the magnetic spring is connected to the magnetic spring fixing plate 504, and the mover of the magnetic spring is connected to the sliding seat 503. The magnetic spring pulls the sliding seat 503, so that the load at the driving end of the vibration driving member 500 is close to zero. When the vibration driving member 500 vibrates, the load force deviation caused by gravity can be reduced as much as possible within the upper and lower two vibration cycles, thereby improving the running accuracy of the vibration driving member 500 and extending the service life of the vibration driving member 500.

[0067] The magnetic spring in this device can adopt the magnetic spring in the prior art, such as the M-Spring constant force magnetic spring, which provides a constant thrust or pulling force within the entire stroke range of the vibration driving member 500, and realizes the compensation or cancellation of gravity through the magnetic field.

[0068] The buffer mechanism is arranged on the side of the vibration shaft seat 505, and one, two or more buffer mechanisms can be set. In this embodiment, one buffer mechanism is set and is arranged at the other end of the vibration shaft seat 505 relative to the vibration driving member 500, and is basically symmetrically arranged about the main vibration shaft 510 and the vibration driving member 500.

[0069] The buffer mechanism includes two buffer springs 520 arranged coaxially with the main vibration shaft 510. One buffer spring 520 is arranged above the vibration shaft seat 505, with its bottom end abutted against the vibration shaft seat 505 and its top end abutted against the positioning member 522 located above the vibration shaft seat 505. The other buffer spring 520 is arranged below the vibration shaft seat 505, with its top end abutted against the vibration shaft seat 505 and its bottom end abutted against the positioning member 522 located below the vibration shaft seat 505.

[0070] The buffer springs 520 can provide a supporting force or a pulling force for the vibration shaft seat 505, the main vibration shaft 510 and its load, such as a fixing device, so as to reduce the load at the driving end of the vibration driving member 500 and extend the service life of the vibration driving member 500. Preferably, the two buffer springs 520 are provided with a pre-compression amount, so as to provide a certain elastic force to offset the load at the driving end of the vibration driving member 500 and improve the running stability of the two buffer springs 520 at the same time. Moreover, the two buffer springs 520 respectively have a downward thrust and an upward thrust on the vibration shaft seat 505, and there will be an automatic force balance position when the vibration driving member 500 is not powered on or the vibration driving member 500 does not output a driving force. Therefore, on the one hand, after the vibration driving member 500 is powered off, the main vibration shaft 510 can automatically return to the force balance point; on the other hand, during the vibration process, every time the main vibration shaft 510 is at the maximum displacement from the balance point (that is, the real starting point), such as when vibrating upward to the maximum displacement, at this time the upper buffer spring 520 has the largest compression amount, and the compression amount of the upper buffer spring 520 is greater than that of the lower one. Therefore, the resultant force of the upper and lower buffer springs 520 is downward, and at this time the vibration driving member 500 needs to provide a downward driving force to drive the main vibration shaft 510 to move downward. At this time, the internal stress of the buffer spring 520 will save a part of the downward driving force for the vibration driving member 500, which is beneficial to the long-term stable operation of the vibration driving member 500 and the improvement of the service life of the driving circuit of the vibration driving member 500.

[0071] Preferably, when the vibration drive 500 reaches the limit of its movement stroke, the buffer spring 520 is compressed and the elastic force provided is ≤ 40% of the rated continuous thrust of the vibration drive 500. If the compression and rebound force of the buffer spring 520 is too large, it will also increase the load on the vibration drive 500 when it is pushed to the limit position. Therefore, it is recommended that it not be greater than 40%.

[0072] In this embodiment, the buffer mechanism further includes a guide post 521 provided on the substrate 200. The buffer spring 520 is sleeved on the guide post 521. Both positioning members 522 are annular blocks, sleeved on the guide post 521 and fixed thereto. The internal gap between the guide post 521 and the buffer spring 520 is not less than 1 mm to prevent the buffer spring 520 from touching and rubbing against the guide post 521 after compression, and at the same time not greater than 5 mm to improve space utilization.

[0073] In this device, the driving end of the vibration drive 500 is connected to the vibration shaft seat 505. The vibration shaft seat 505 is connected to the main vibration shaft 510 and the buffer mechanism. The buffer mechanism includes a buffer spring 520 arranged coaxially with the main vibration shaft 510. By means of the buffer spring 520, the load on the driving end of the vibration drive 500 is further reduced, the service life of the vibration drive 500 is extended, and the vibration drive 500 is kept balanced, so that the main vibration shaft 510 drives the implant test piece to vibrate up and down at the balance point, improving the stability of the periodic axial movement of the main vibration shaft 510 and thus improving the test accuracy.

[0074] As Figure 6 shown, it is another connection structure of the vibration drive 500 and the main vibration shaft 510 of this device. In this structure, the main vibration shaft 510 is coaxially arranged with the driving end of the vibration drive 500, thus avoiding the generation of bending moment, improving the load-bearing capacity of the main vibration shaft 510, and improving the stability of the periodic axial movement of the main vibration shaft 510, and thus improving the test accuracy.

[0075] A cantilever beam is provided in the radial direction of the main vibration shaft 510, and a buffer mechanism is provided on the cantilever beam. Preferably, two buffer mechanisms are symmetrically arranged.

[0076] As Figure 7As shown in the figure, the lifting drive member 600 is vertically arranged on the base plate 200. The lifting drive member 600 provides power for the lifting of the base plate 200, thereby adjusting the height positions of the upper fixing mechanism 800 and the lower fixing mechanism 820. The transmission assembly at least includes a T-shaped coupling, so that the power of the lifting drive member 600 is evenly transmitted to both sides, ensuring that the base plate 200 remains flat in any state. This provides a basis for the proper assembly of other components, improves the stiffness of the whole machine, achieves good locking, and further improves the vibration stability. The lifting drive member 600 can be a servo motor, a stepper motor, etc., and it is connected to the elevator 610 through the transmission assembly. In this equipment, a screw elevator is adopted. The screw 611 is arranged parallel to the main guiding column 300 and fixed on the base 400. The elevator 610 is arranged on the base plate 200, that is, it is fixed by the screw 611 and the internal nut of the elevator 610 rotates to drive the base plate 200 to move up and down. The top ends of the screw 611 and the main guiding column 300 are connected with a support plate 310, making the screw 611 and the main guiding column 300 an integral whole with better rigidity and improving the stability of the support for the base plate 200.

[0077] At this time, the base plate 200 and the working unit thereon are relatively fixed by the thread engagement of the screw 611 and the nut. To further improve the stability of the base plate 200 and prevent the base plate 200 from falling, the elevator 610 achieves a clamping effect with the main guiding column 300 through the clamping mechanism 620. Specifically, as Figure 8 shown, the clamping mechanism 620 includes a clamping seat 621 and a top cover 622. In addition to the elevator 610 being fixed to the base plate 200, the clamping seat 621 is also fixed to the base plate 200. The elevator 610 is arranged inside the clamping seat 621, and a top cover 622 is arranged above the clamping seat 621 to achieve dust prevention. As Figure 9As shown, the clamping seat 621 includes a machine installation part and a column installation part arranged side by side. The machine installation part is provided with a machine installation groove 6211, and the elevator 610 is clamped in the machine installation groove 6211. An avoidance opening is arranged on the machine installation groove 6211 facing the coupling side. The column installation part includes a clamping block I 6212 and a clamping block II 6213. From left to right, the clamping seat 621 is successively the machine installation part, the clamping block I 6212, and the clamping block II 6213, and the three have a compact structure. Arc grooves are arranged on the opposite sides of the clamping block I 6212 and the clamping block II 6213 to form a clamping hole 6214 for holding the main guiding column 300. The clamping block I 6212 and the clamping block II 6213 are connected at one end, and there is a distance between the other ends of the two, so that the size of the clamping hole 6214 can be adjusted. The clamping block II 6213 is provided with a fastening hole 6217 facing the clamping block I 6212 for a screw to pass through to lock the clamping block I 6212 and the clamping block II 6213, so that the clamping block I 6212 and the clamping block II 6213 hold the main guiding column 300 tightly. Furthermore, on the basis of the lead screw 611 fixing the substrate 200, the clamping seat 621 holds the main guiding column 300 tightly to achieve the purpose of fixing the substrate 200, improve the stability of the substrate 200, and reduce vibration. To avoid excessive deformation and fracture of the connection ends of the clamping block I 6212 and the clamping block II 6213 caused by screw fastening, a buffer groove I 6215 is opened on the outer side of the connection ends of the two, and the buffer groove I 6215 penetrates the height direction of the connection ends. A buffer groove II 6216 is also opened on the inner side of the connection ends of the two, and the buffer groove II 6216 penetrates the height direction of the connection ends. When the clamping block II 6213 deforms towards the clamping block I 6212 under the action of the screw, the arc groove of the clamping block II 6213 deforms towards the arc groove of the clamping block I 6212 more evenly, so as to ensure the contact area with the main guiding column 300, and further improve the clamping stability of the main guiding column 300. The connection ends of the clamping block I 6212 and the clamping block II 6213, that is, the area clamped by the buffer groove I 6215 and the buffer groove II 6216, have a strength that can support the total gravity of the entire substrate 200 and the equipment body connected thereto, so as to prevent the substrate 200 and the equipment body from falling due to gravity and causing accidents after the failure of two elevators or the lifting driving member 600 and the inability to provide support force. In this embodiment, there are two sets of clamping seats 621 on the left and right. Therefore, the strength of the connection ends of a set of clamping block I 6212 and clamping block II 6213 ≥ 1 / 2 of the gravity of the substrate 200 and the equipment body. Further, there is an interference amount of about 20% to ensure a sufficient safety factor.

[0078] In use, the substrate 200 is moved to a specified position by the elevator 610, and then the main guiding column 300 is clamped by the clamping seat 621, so as to make the test environment more stable. When the elevator 610 works, the main guiding column 300 provides lifting guidance for the elevator 610 at the same time. A main guiding sliding sleeve 320 is also arranged on the substrate 200. The main guiding sliding sleeve 320 is sleeved on the outside of the main guiding column 300. The material of the main guiding sliding sleeve 320 is engineering plastic. By using the high strength, fatigue resistance, wear resistance, self-lubrication and shock absorption characteristics of the engineering plastic, the moving stability of the substrate 200 is improved. And the length of the main guiding sliding sleeve 320 in this equipment is 1 / 7 - 1 / 5 of the length of the main guiding column 300, so as to fully ensure the contact area between the main guiding sliding sleeve 320 and the main guiding column 300. And under the same contact surface gap in the vertical direction, the deviation of the vector direction of the main guiding column 300 along the axis of the main guiding sliding sleeve 320 is small, thus improving its moving stability and heavy load retention.

[0079] In order to make the substrate 200 more stable when the clamping seat 621 clamps the main guiding column 300, two main guiding columns 300 are provided, and the two main guiding columns 300 are symmetrically arranged about the main vibration axis 510. A lifting ring hole 301 can also be arranged at the top end of the main guiding column 300 for installing a lifting ring, so that the equipment can be transferred by hoisting.

[0080] As Figure 10 As shown, the main guiding column 300 and the lead screw 611 are connected to the base 400. The base 400 includes a bottom plate 410. The lead screw 611 is fixed to the bottom plate 410 through a flange. The main guiding column 300 passes through the bottom plate 410 and is connected with a locking nut 330. A flat washer 331 and a corrugated washer 332 are arranged between the locking nut 330 and the bottom plate 410. The flat washer 331 is used to increase the contact surface area between the locking nut 330 and the main guiding column 300, reduce the pressure per unit area, and protect the surfaces of both from being damaged. The corrugated washer 332 is used to prevent the locking nut 330 from loosening and slow down the impact. Further, the bottom end of the main guiding column 300 is stepped, so as to be pressed against the bottom plate 410 through the stepped shaft section and locked by the locking nut 330. In this embodiment, the radial constraint of the main guiding column 300 is realized through a light hole, that is, a through hole with a smooth inner wall, so as to improve the verticality during installation. And the processing precision of the light hole is much higher than that of the threaded hole, and the hole position accuracy is high, so as to ensure the verticality of the main guiding column 300 before installation. In addition, the bottom plate 410 is generally made of aluminum alloy, and the main guiding column 300 and the locking nut 330 are made of steel. Aluminum alloy is relatively softer than steel. If coarse thread is used to ensure the mechanical strength when processing the thread, the coarse thread is easy to loosen during vibration. While a high-hardness and high-strength steel nut can be used, and a fine thread can be used. Under the condition that the strength is satisfied, a good self-locking and anti-loosening effect can be achieved.

[0081] The main guiding column 300 and the base 400, that is, one end connected to the bottom plate 410, are provided with an annular groove. The side surface of the bottom plate 410 is provided with a column locking hole facing the annular groove. The column locking hole communicates with a light hole. A mounting bolt abuts against the bottom of the annular groove located in the light hole to achieve radial fixation of the main guiding column 300, further improving the stability of the main guiding column 300 and the stability of the lifting bracket.

[0082] Two auxiliary beams 440 are symmetrically arranged below the bottom plate 410. The two auxiliary beams 440 are respectively arranged directly below the two side lead screws 611 and the main guiding column 300, thereby improving the smoothness of the equipment support and reducing the contact area between the equipment and the ground, thereby reducing vibration conduction and avoiding affecting other equipment in the laboratory. Further, to prevent the locking nut 330 from loosening and falling off, a groove 441 is provided above the auxiliary beam 440. After the locking nut 330 locks the main guiding column 300, it is embedded in the groove 441. The depth of the groove 441 is adapted to the thickness of the locking nut 330 to prevent the locking nut 330 from detaching from the main guiding column 300, that is, the gap between the bottom surface of the groove 441 and the locking nut 330 is not sufficient to allow the locking nut 330 to detach from the main guiding column 300, restricting the falling off of the locking nut 330, thereby improving the stability and safety of the equipment. Shock-absorbing feet or shock-absorbing rubber pads 430 can also be provided below both ends of the auxiliary beam 440. For further shock absorption, a rubber pad 430 is also laid on the upper surface of the bottom plate 410. The rubber pad 430 covers the entire bottom plate 410 and fits against the edges of the lead screw 611 and the main guiding column 300, thereby absorbing the vibration conducted by the two.

[0083] The working unit cable of this equipment extends from the top of the housing 100 and is connected to the electrical interface box provided on the base 400. As Figure 2 and Figure 3 shown, through holes are provided at the edge of the upper cover plate 151 of the housing 100 for the cable of the working unit to extend out, and a drag chain seat plate 152 is installed at the through hole, so that the cable between the housing 100 and the electrical interface box is arranged through the drag chain. As Figure 10 shown, the bottom plate 410 is provided with a wire passing seat 420 at the position corresponding to the drag chain seat plate 152. An electrical interface box 421 and a corresponding male head seat 422 are installed on the wire passing seat 420, so that the cable moves synchronously with the lifting of the elevator 610, avoiding cable chaos.

[0084] As Figure 11As shown, an upper fixing mechanism 800 and a lower fixing mechanism 820 are provided below the substrate 200. The upper fixing mechanism 800 is connected to the substrate 200 through an adapter flange 210, so as to facilitate the replacement of the upper fixing mechanism 800 according to different test types and implant test piece types. The lower fixing mechanism 820 is flange-connected to the main vibration shaft 510 passing through the substrate 200 and the upper fixing mechanism 800. The main vibration shaft 510 drives the lower fixing mechanism 820 to vibrate up and down relative to the upper fixing mechanism 800, so as to test the implant test piece. A force sensor 810 is also provided on the upper fixing mechanism 800. The two ends of the implant test piece are respectively connected to the force sensor 810 and the lower fixing mechanism 820, so as to detect its stress condition.

[0085] The upper fixing mechanism 800 includes a hanging plate I 801 and a hanging plate II 802 connected in sequence from top to bottom. The hanging plate I 801 is connected to the adapter flange 210. The main vibration shaft 510 passes through the hanging plate I 801 and the hanging plate II 802. The force sensor 810 is arranged below the hanging plate II 802 through a mounting seat 813. As Figure 12 and Figure 13 shown, sliding columns 811 penetrate through the plate bodies of the hanging plate I 801 and the hanging plate II 802. The bottom ends of the sliding columns 811 are connected to the mounting seat 813. Threaded sections 8111 are provided on the sliding columns 811 located between the plate bodies of the hanging plate I 801 and the hanging plate II 802, and adjusting nuts 812 are sleeved on the outer sides thereof. By rotating the adjusting nuts 812, the sliding columns 811 drive the force sensor 810 to move up and down, so as to adjust the distance between the upper fixing mechanism 800 and the lower fixing mechanism 820, and further make the initial stress of the implant test piece located between the two be 0, which is convenient for unified testing. Further, sliding column locking holes are provided on the side surface of the plate body of the hanging plate II 802 facing the side surface of the sliding column 811 for a bolt to abut and lock the sliding column 811. Connecting holes 8131 are provided on the side surface of the mounting seat 813 for screws to pass through so that the mounting seat 813 is connected to the sliding column 811. Still further, the corresponding positions of the sliding columns 811 are plane structures, so as to facilitate the end surface of the bolt to abut and lock.

[0086] The lower fixing mechanism 820 includes a secondary vibration shaft 821 detachably connected to the main vibration shaft 510. A lower clamp 822 is connected to the tail end of the secondary vibration shaft 821. The lower clamp 822 is selected according to the type of the implant test piece.

[0087] Embodiment 2:

[0088] On the basis of Embodiment 1, as Figures 14 - 15 shown, in Embodiment 2, an environmental simulation chamber 900 is further provided in this device to simulate the actual environment where the implant test piece is located and improve the test accuracy. As Figure 16 shown, the cross-sectional view of this device, the basic structure of this device is the same as that of Embodiment 1.

[0089] The environmental simulation chamber 900 can be a water tank or an air tank, so as to provide a set test environment with certain temperature, pressure, etc. for the implant test piece. During test preparation, the implant test piece located between the upper fixing mechanism 800 and the lower fixing mechanism 820 is moved into the environmental simulation chamber 900 by the elevator 610.

[0090] The environmental simulation chamber 900 is arranged on the base 400. Specifically, the rubber pad 430 is cut with an avoidance area adapted to the bottom surface of the environmental simulation chamber 900, and a backing plate is embedded in the avoidance area. The backing plate is generally made of a metal part. The backing plate is connected to the bottom plate 410 to carry and fix the environmental simulation chamber 900. Multiple threaded mounting holes can be preset on the backing plate to facilitate the subsequent replacement of the environmental simulation chamber 900 with different sizes or other structural parts. The side of the environmental simulation chamber 900 is provided with a side wing plate for connecting with the backing plate. The environmental simulation chamber 900 includes a top plate 910, which is used to close the box during testing to prevent sundries from falling in and interfering with the test accuracy. And, taking the water tank as an example, the top plate 910 can reduce the risk of water splashing out, and at the same time reduce the impact of water evaporation on the test. The top plate 910 is arranged on the upper fixing mechanism 800. Specifically, a hanging plate III 803 (refer to Figure 11 ) is arranged below the hanging plate II 802, and the top plate 910 is connected to the hanging plate III 803, so as to open and close the environmental simulation chamber 900 through the upper fixing mechanism 800. The front and rear panels of the environmental simulation chamber 900 are set to be detachable, so that the implant test piece can be replaced or the implant test piece can be inspected by removing the front and rear panels of the environmental simulation chamber 900 without adjusting the height of the substrate 200.

[0091] In this embodiment, the electrical interface box 421 is arranged at a certain distance from the bottom plate 410. Correspondingly, the lowermost male head seat 422 is also arranged at a certain distance from the bottom plate 410, such as 20 - 30 mm, so as to prevent the liquid from flooding the electrical interface and causing equipment damage when the environmental simulation chamber 900, especially the water tank, is broken.

[0092] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An environmental simulation type implant fatigue testing device, characterized in that, it includes: A substrate, on which a device main body is arranged. The device main body includes a vibration driving member, an upper fixing mechanism, a lower fixing mechanism and a lift. The upper fixing mechanism is connected to the lower side of the substrate, the lower fixing mechanism is connected to the vibration driving member and is located below the upper fixing mechanism, and an implant test piece is connected between the upper fixing mechanism and the lower fixing mechanism; A base arranged below the substrate, on which an environmental simulation box for simulating the environment where the implant is located is arranged; and, Two symmetrically arranged main guiding columns, which are arranged between the substrate and the base, and the axis of symmetry thereof passes through the center of gravity of the substrate and the device main body. The substrate is driven by the lift to move up and down along the main guiding columns so that the implant test piece can enter and exit the environmental simulation box; The vibration driving member is a linear motor or an electromagnetic vibrator, and the vibration driving member is arranged vertically; The driving end of the vibration driving member is connected with a vibration shaft seat, on which a main vibration shaft is arranged. The main vibration shaft vertically penetrates the substrate and is connected with the lower fixing mechanism. The vibration driving member drives the main vibration shaft to vibrate up and down through the vibration shaft seat. A buffer mechanism is arranged on the side of the vibration shaft seat. The buffer mechanism includes two buffer springs arranged coaxially with the main vibration shaft. One buffer spring is arranged above the vibration shaft seat, its bottom end abuts against the vibration shaft seat, and its top end abuts against the positioning member. The other buffer spring is arranged below the vibration shaft seat, its top end abuts against the vibration shaft seat, and its bottom end abuts against another positioning member; The two buffer springs are provided with a pre-compression amount and are used to offset the load at the driving end of the vibration driving member; The main vibration shaft is arranged parallel to the driving end of the vibration driving member; An upper guiding sliding sleeve is sleeved on the proximal end of the main vibration shaft, and a lower guiding sliding sleeve is sleeved on the distal end. The upper guiding sliding sleeve is fixed to the substrate, and the lower guiding sliding sleeve is fixed to the upper fixing mechanism.

2. The environmental simulation type implant fatigue testing device according to claim 1, characterized in that, A top plate adapted to the environmental simulation box is connected to the lower side of the substrate, and the top plate is driven by the substrate to cover or separate from the environmental simulation box.

3. The environmental simulation type implant fatigue testing device according to claim 1, characterized in that, The environmental simulation box is provided with a detachable front panel and / or rear panel.

4. The environmental simulation type implant fatigue testing device according to claim 1, characterized in that, The device main body further includes a clamping mechanism. One end of the main guiding column penetrates the substrate and is connected to it through the clamping mechanism, and the other end is connected to the base. The clamping mechanism includes a clamping seat and a fastening member. The clamping seat is connected to the substrate. The clamping seat includes a machine mounting part and a column mounting part arranged side by side. The lift is arranged in the machine mounting part. The main guiding column is inserted into the column mounting part, and the column mounting part clamps or loosens the main guiding column through a releasable fastening member.

5. The environmental simulation type implant fatigue testing device according to claim 4, characterized in that, The column installation part includes a clamping block I and a clamping block II, and a fastener passes through the clamping block II and is connected to the clamping block I, and the clamping block I and the clamping block II are clamped and held tightly on the main guiding column by tightening the fastener.

6. The environmental simulation type implant fatigue testing device according to claim 5, characterized in that, the main guiding column is a circular column, and arc grooves are arranged on the opposite sides of the clamping block I and the clamping block II to form a clamping hole for holding the main guiding column.

7. The environmental simulation type implant fatigue testing device according to claim 1, characterized in that, the elevator is a screw elevator, and the screw in the screw elevator is arranged between the substrate and the base and is parallel to the main guiding column.

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