Testing Fixture for the Cutting Knife Pin of a Stapler

Abstract

The present invention relates to the field of performance testing of medical devices, and particularly to a test fixture for a cutting knife pin of a stapler. It is installed on the test platform of a tensile testing machine and is used to place the cutting knife pin, and it is located on the strength testing tooling and / or toughness testing tooling on the test platform; the tensile testing machine is adapted to press down the strength testing tooling or toughness testing tooling respectively to detect the strength or toughness of the cutting knife pin. The present invention tests the performance data of the cutting knife pin, effectively controls its strength and toughness, and improves the stability.

Description

Technical Field

[0001] The present invention relates to the field of performance testing of medical devices, and particularly to a test fixture for a cutting knife pin of a stapler. Background Art

[0002] After the cutting knife pin is produced, it is necessary to test its strength and toughness. Currently, there is no corresponding performance test fixture for the cutting knife pin, which cannot simulate the stress situation and stress concentration points during the use of the cutting knife pin, and cannot obtain the quantified performance data of the cutting knife pin through corresponding equipment, resulting in a relatively low qualified rate and poor stability performance of the produced stapler pins. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that due to the lack of a corresponding performance test fixture for the cutting knife pin, the stress situation and stress concentration points during the use of the cutting knife pin cannot be simulated, and the quantified performance data of the cutting knife pin cannot be obtained. Based on this, it is necessary to provide a test fixture that can test the strength and toughness of the cutting knife pin.

[0004] The technical solution adopted by the present invention to solve its technical problems is: The present invention discloses a test fixture for a cutting knife pin of a stapler, which is installed on the test platform of a tensile testing machine and is used to place the cutting knife pin, and it is a strength testing tooling and / or toughness testing tooling located on the test platform; the tensile testing machine is adapted to press down the strength testing tooling or the toughness testing tooling respectively to detect the strength or toughness of the cutting knife pin.

[0005] Further, the strength testing tooling includes a strength testing base located on the test platform, at least one semi-circular groove located on the surface of the strength testing base, a slit vertically provided in the middle of the groove; an insert located at the slit; a round hole adapted for the horizontal passage of the cutting knife pin is provided on the insert; the tensile testing machine is adapted to press down the insert to move along the slit, so that the bottom of the cutting knife pin abuts against the bottom of the semi-circular groove for detecting the strength of the cutting knife pin.

[0006] Further, the depth of the slit is greater than that of the semi-circular groove, so that the bottom of the cutting knife pin is suspended at the slit.

[0007] Further, the semi-circular groove is a semi-circular groove matching the cutting knife pin; there are multiple grooves and they are equally spaced along the length direction of the slit.

[0008] Further, the toughness testing tooling includes a toughness testing base located on the test platform, at least one cylindrical groove located on the surface of the toughness testing base, and a toughness testing pressing block located above the toughness testing base; an arc-shaped groove is provided on the pressing block, so that the top of the cutting knife pin abuts against the arc-shaped groove on the pressing block for detecting the toughness of the cutting knife pin.

[0009] Further, the cylindrical groove is a cylindrical groove matching the cutting tool pin; a plurality of the cylindrical grooves are evenly distributed on the surface of the toughness test base.

[0010] Further, the depth of the cylindrical groove is less than the length of the cutting tool pin, so that the top of the cutting tool pin is on the toughness base of the cutting tool pin.

[0011] Further, the tensile testing machine includes the test platform, a moving platform above the test platform, and a pressure head below the moving platform; the moving platform is adapted to drive the pressure head to move above the strength test tooling or the toughness test tooling.

[0012] Further, the tensile testing machine further includes a pressure sensor located between the pressure head and the moving platform.

[0013] The beneficial effect of the present invention is that: for the test fixture for the cutting tool pin of the stapler of the present invention, the strength test tooling with the cutting tool pin installed is pressed downward by the tensile testing machine, and the strength performance of the cutting tool pin is tested through the pressure sensor. The cutting tool pin is vertically placed in the toughness test base and the toughness test pressing block is covered, and the tensile testing machine presses the toughness test pressing block downward, and the toughness performance of the cutting tool pin is tested through the pressure sensor, so that the performance data of the cutting tool pin is quantified, and the stability and qualification rate of the product are improved. Description of the Drawings

[0014] The present invention will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 is a schematic structural diagram of the strength test of the test fixture for the cutting tool pin of the stapler of the present invention;

[0016] Figure 2 is Figure 1 a schematic structural diagram of the strength test tooling in

[0017] Figure 3 is Figure 2 a side view of the strength test tooling in

[0018] Figure 4 is a schematic structural diagram of the toughness test of the test fixture for the cutting tool pin of the stapler of the present invention;

[0019] Figure 5 is Figure 4 a schematic structural diagram of the toughness test tooling shown in

[0020] Figure 6 is Figure 5 a side view of the toughness test tooling in

[0021] The names and numbers of the components in the figure are as follows: tensile testing machine 1, moving platform 11, pressure sensor 12, indenter 13, test platform 14, cutting tool pin 2, strength testing tooling 3, strength testing base 31, semi-circular groove 32, gap 33, strength testing insert 34, round hole 35, toughness testing tooling 4, toughness testing base 41, cylindrical groove 42, toughness testing block 43, arc-shaped groove 44. Detailed implementation mode

[0022] Now, the present invention will be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, so it only shows the components related to the present invention.

[0023] As Figures 1-6 shown, the test fixture for the cutting tool pin of the stapler of the present invention is installed on the test platform 14 of the tensile testing machine 1 for placing the cutting tool pin 2, which is located on the strength testing tooling 3 and / or toughness testing tooling 4 on the test platform 14; the tensile testing machine 1 is adapted to press down the strength testing tooling 3 or toughness testing tooling 4 respectively to detect the strength or toughness of the cutting tool pin 2.

[0024] In this embodiment, the tensile testing machine 1 includes a test platform 14 horizontally placed at the bottom of the tensile testing machine 1 for placing the strength testing tooling 3 and / or toughness testing tooling 4, a moving platform 11 installed above the test platform 14 for driving the indenter 13 of the tensile testing machine 1 to move up and down and left and right, a cylindrical indenter 13 installed below the moving platform, and a pressure sensor 12 installed between the indenter 13 and the moving platform 11 for testing the strength and toughness of the cutting tool pin 2; the moving platform 11 is adapted to drive the indenter 13 to move above the strength testing tooling 3 or toughness testing tooling 4; the pressure sensor 12 presses down the strength testing insert 34 through the indenter 13 to test the strength data of the cutting tool pin 2 or the pressure sensor 12 presses down the toughness testing block 43 through the indenter 13 to test the toughness data of the cutting tool pin 2.

[0025] As Figures 1-3 shown, a strength testing tooling 3 is placed on the test platform 14 of the tensile testing machine 1 for testing the strength of the cutting tool pin 2. The strength testing tooling 3 includes a strength testing base 31, and the strength testing base 31 is located above the test platform 14 and is horizontally placed.

[0026] As Figure 2As shown, the main body of the strength test base 31 is a cuboid. A plurality of semi-circular grooves 32 having the same width as the cuboid are formed on the upper surface of the cuboid, and a slit 33 that straddles all the semi-circular grooves 32 and is located at the central position of the upper surface of the cuboid is provided for placing the strength test insert 34 and the cutting tool pin 2 to be tested. At least one semi-circular groove 32 on the surface of the strength test base 31 is used to horizontally place the cutting tool pin 2 in the semi-circular groove 32. Optionally, there are a plurality of the semi-circular grooves 32, and the width of the semi-circular groove 32 matches that of the cutting tool pin 2. The depth of the semi-circular groove 32 is equal to the radius of the cutting tool pin, and the length of the semi-circular groove 32 is equal to the width of the strength test base 31, facilitating the horizontal placement of the cutting tool pin 2 into the semi-circular groove 32.

[0027] In this embodiment, a slit 33 is further provided on the surface of the strength test base 31. The slit 33 is vertically provided at the center of the plurality of semi-circular grooves 32. Optionally, the slit 33 is a cuboid with a relatively narrow width, and the width of the slit 33 is greater than the thickness of the strength test insert 34, and the height of the slit 33 is greater than the side length of the strength test insert 34, facilitating the vertical insertion of the strength test insert 34 into the slit 33 and the strength test insert 34 being suspended in the slit 33, ensuring that the test fixture does not affect the strength value of the cutting tool pin 2 during the test.

[0028] As Figures 2-3 shown, the strength test tooling 3 further includes a strength test insert 34. The strength test insert 34 is vertically placed in the slit 33, facilitating the testing of the strength of the cutting tool pin 2. Optionally, the strength test insert 34 is a square round-corner steel sheet to avoid scratching during the installation operation, and a round hole 35 is provided on the strength test insert 34. Optionally, the diameter of the round hole 35 matches that of the cutting tool pin 2 for placing the cutting tool pin 2 into the round hole 35 of the strength test insert 34.

[0029] In this embodiment, when testing the strength of the cutting tool pin 2, first insert the cutting tool pin 2 evenly into the round hole 35 of the strength test insert 34 in the left-right length direction, then place the strength test insert 34 with the cutting tool pin 2 installed at the slit 33 and horizontally place the cutting tool pin 2 in the semi-circular groove 32 on the surface of the strength test base 31. The moving platform 11 of the tensile machine 1 moves to align the pressing head 13 part of the tensile machine 1 with the strength test insert 34 and press down, and read out the critical value detected by the pressure sensor 12.

[0030] As Figures 4-6As shown, a toughness test tooling 4 is placed on the test platform 14 of the tensile testing machine 1 for testing the toughness of the cutting tool pin 2. The toughness test tooling 4 includes a toughness test base 41 which is located above the test platform 14 and horizontally placed. The main body of the toughness test base 41 is a relatively large right-angled U-shaped groove, and the length and width of the right-angled U-shaped groove match the length and width of the toughness test pressing block 43 for placing the toughness test pressing block 43.

[0031] As Figure 4 shown, at least one cylindrical groove 42 is provided on the surface of the toughness test base 41 for vertically placing the cutting tool pin 2 in the cylindrical groove 42. Optionally, there are multiple cylindrical grooves 42, and the diameter of the cylindrical grooves 42 matches that of the cutting tool pin 2. The depth of the cylindrical grooves 42 is less than the length of the cutting tool pin 2, facilitating the bottom position of the cutting tool pin 2 to contact the bottom of the cylindrical groove 42 and the top of the cutting tool pin 2 to be on the toughness test base 41.

[0032] As Figures 5-6 shown, the toughness test tooling 4 further includes a strength test insert 34 and a toughness test pressing block 43. The toughness test pressing block 43 is placed in the right-angled U-shaped groove of the toughness test base 41 for facilitating the testing of the toughness of the cutting tool pin 2. Optionally, the toughness test pressing block 43 is formed by stacking two cuboids. The bottom is a rounded cuboid shape that fits the shape of the right-angled U-shaped groove of the toughness test base 41. The length of one side of the top cuboid is slightly longer than the length of the right-angled U-shaped groove of the toughness test base 41 and the height is smaller, which is stuck on one side notch of the right-angled U-shaped groove of the toughness test base 41 for facilitating the removal of the cutting tool pin 2 after testing the toughness of the cutting tool pin 2.

[0033] As Figure 6 shown, at least one arc-shaped groove 44 is provided on the lower surface of the toughness test pressing block 43. One side of the arc-shaped groove is an arc and the other side is a vertical plane. The arc-shaped grooves 44 correspond to the positions of the cylindrical grooves 42 on the toughness test base 41 for abutting against the top position of the cutting tool pin 2 to prevent the cutting tool pin 2 from moving during the test.

[0034] In this embodiment, when testing the toughness of the cutting tool pin 2, first vertically insert the cutting tool pin 2 into the cylindrical groove 42 on the toughness test base 41, and then place the toughness test pressing block 43 on the toughness test base 41. At this time, the top position of the cutting tool pin 2 abuts against the arc-shaped groove 44. The moving platform 11 of the tensile testing machine 1 moves to press the toughness test pressing block 43 downward by the pressing head 13 part of the tensile testing machine 1, and read out the critical value detected by the pressure sensor 12.

[0035] In summary, the test fixture for the cutting knife pin of the stapler according to the present invention is installed on the test platform of the tensile testing machine and is used to place the cutting knife pin, which is located on the strength test tooling and / or toughness test tooling on the test platform; the tensile testing machine is adapted to press down the strength test tooling or toughness test tooling respectively to detect the strength or toughness of the cutting knife pin. The present invention tests the performance data of the cutting knife pin, effectively controls its strength and toughness, and improves stability.

[0036] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can make various changes and modifications without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A test fixture, mounted on a test platform of a tensile testing machine, for placing a cutting knife pin, a strength test fixture and a toughness test fixture on the test platform; the tensile testing machine is suitable for pressing down the strength test fixture or the toughness test fixture respectively to detect the strength or toughness of the cutting knife pin, the strength test fixture comprises a strength test base on the test platform, at least one semicircular groove on the surface of the strength test base, a slit vertically arranged in the middle of the groove; an insert at the slit; a circular hole suitable for the horizontal passage of the cutting knife pin is opened on the insert, the semicircular groove is a semicircular groove matching the cutting knife pin; the semicircular grooves are multiple and are evenly spaced along the length direction of the slit, the depth of the slit is greater than the semicircular groove, so that the cutting knife pin at the slit The bottom is suspended; the toughness test tooling includes a toughness test base located on the test platform, at least one cylindrical groove located on the surface of the toughness test base, and a toughness test pressure block located above the toughness test base; an arc-shaped groove is provided on the pressure block so that the top of the cutting knife pin abuts against the arc-shaped groove on the pressure block, which is used to detect the toughness of the cutting knife pin; at least one cylindrical groove on the surface of the toughness test base is used to vertically place the cutting knife pin in the cylindrical groove; at least one arc-shaped groove is provided on the lower surface of the toughness test pressure block, one side of the arc-shaped groove is an arc and the other side is a vertical plane, the arc-shaped groove corresponds to the position of the cylindrical groove on the toughness test base one by one, and is used to abut against the top position of the cutting knife pin to prevent the cutting knife pin from moving during the test.

2. The test fixture according to claim 1, characterized in that: The tensile testing machine is suitable for pressing the insert piece downward to move along the gap so that the bottom of the cutting knife pin abuts against the bottom of the semicircular groove, which is used to detect the strength of the cutting knife pin.

3. The test fixture according to claim 1, characterized in that: The cylindrical groove is a cylindrical groove matching the cutting knife pin; the cylindrical groove is a plurality of grooves evenly distributed on the surface of the toughness test base.

4. The test fixture according to claim 3, characterized in that: The depth of the cylindrical groove is less than the length of the cutting blade pin, so that the top of the cutting blade pin is on the tough base of the cutting blade pin.

5. The test fixture according to claim 1, characterized in that: The tensile testing machine comprises the test platform, a mobile platform located above the test platform, and a pressure head located below the mobile platform; the mobile platform is suitable for driving the pressure head to move above the strength testing tooling or the toughness testing tooling.

6. The test fixture according to claim 1, characterized in that: The tensile machine also includes a pressure sensor located between the pressure head and the moving platform.

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