Auxiliary pressure head replacing device for mechanical property testing machine

Abstract

The utility model provides an auxiliary pressure head replacing device for a mechanical property testing machine, which relates to the technical field of mechanical property testing and comprises a connecting seat arranged at the output end of a driving part, a first inserting hole arranged on the side wall of the connecting seat, a connecting hole arranged in the connecting seat, a connecting column arranged in the connecting hole in a sliding manner, and a second inserting hole arranged in the connecting column, the lower end of the connecting column extends out of the connecting hole and is connected with the pressing head body, a second inserting hole corresponding to the first inserting hole is formed in the connecting column, a fixing bolt is arranged in the second inserting hole, and the two ends of the fixing bolt penetrate through the first inserting hole to extend out of the connecting base. According to the utility model, the connecting column is inserted into the connecting hole of the connecting seat, and then the fixing bolt is sequentially inserted into the first inserting hole and the second inserting hole, so that the connecting column can be fixed in the connecting seat, the installation of the pressure head body is completed, the connecting column can be separated from the connecting seat by pulling out the fixing bolt, and the pressure head body can be quickly disassembled. The time of replacing the pressure head body by a worker is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical property testing, in particular to an auxiliary pressure head replacement device for a mechanical property testing machine. Background Art

[0002] The steel pipe scaffolding fastener mechanical properties testing machine is a professional equipment used to test the mechanical properties of steel pipe scaffolding fasteners. The steel pipe scaffolding fastener mechanical properties testing machine can detect the anti-slip, anti-destruction, torsional stiffness, tensile and compressive mechanical properties of right-angle fasteners, rotating fasteners, butt fasteners and bases.

[0003] For example, a Chinese patent with authorization announcement number CN212748511U discloses a steel pipe fastener testing machine, which includes a frame, a mounting platform, a pressure block, and a first driving member, wherein a limit plate is provided at the output end of the first driving member, the limit plate extends in the horizontal direction, and the opposite ends of the limit plate are respectively slidably installed on the opposite sides of the frame in the vertical direction, the pressure block is installed on the side of the limit plate away from the first driving member, the mounting platform is installed on the frame at a position directly below the pressure block, the first driving member is used to drive the limit plate to drive the pressure block to make a linear reciprocating motion in the direction close to the mounting platform, and the frame is provided with a limit member for limiting the relative position of the limit plate and the frame. This application has the effect of improving the pressure block from falling directly to the mounting platform and causing harm to the operator in the event of an accidental fall.

[0004] Since steel pipe scaffolding fasteners have different shapes and sizes, different pressure heads need to be replaced when testing different steel pipe scaffolding fasteners. The pressure block of the above-mentioned testing machine is generally fixed to the output end of the first drive component of the testing machine by a threaded connection. When replacing the pressure block, the pressure block needs to be unscrewed from the output end of the first drive component. If the thread is damaged, it is more laborious to disassemble and assemble the pressure block, which is inconvenient for staff to disassemble and replace the pressure block, reducing work efficiency. Utility Model Content

[0005] The utility model provides an auxiliary pressure head replacement device for a mechanical property testing machine, which is used to solve the technical problem that it is laborious to disassemble and assemble a pressure block, which is inconvenient for workers to disassemble and replace the pressure block and reduces work efficiency.

[0006] In order to solve the above technical problems, the utility model discloses an auxiliary pressure head replacement device for a mechanical properties testing machine, including: a connecting seat arranged at the output end of the driving member, a first socket arranged on the side wall of the connecting seat, a connecting hole arranged in the connecting seat, the connecting hole is connected to the first socket, a connecting column is slidably arranged in the connecting hole, the lower end of the connecting column extends to the outside of the connecting hole and is connected to the pressure head body, a second socket corresponding to the first socket is arranged in the connecting column, a fixing pin is arranged in the second socket, and both ends of the fixing pin respectively pass through the first socket and extend to the outside of the connecting seat.

[0007] Preferably, a limit head is provided at one end of the fixed latch.

[0008] Preferably, the area of ​​one end of the limiting head close to the fixing pin is larger than the radial cross-sectional area of ​​the first plug hole.

[0009] Preferably, a limiting plate is provided on the outer wall of the connecting column, and the diameter of the limiting plate is larger than the diameter of the connecting hole.

[0010] Preferably, the central axis of the first plug hole and the central axis of the second plug hole are on the same straight line, and the central axis of the first plug hole is perpendicular to the central axis of the connecting hole.

[0011] Preferably, a guide groove is provided on the side wall of the fixed pin, the guide groove is arranged axially along the fixed pin, a guide block is provided on the inner wall of the first socket, one end of the guide block is fixedly connected to the inner wall of the first socket, and the other end of the guide block extends into the guide groove and is slidably connected to the inner wall of the guide groove.

[0012] Preferably, the length of the guide slot is equal to the length of the fixing pin.

[0013] Preferably, an arc-shaped limiting groove is provided on the outer periphery of the fixing pin, and one end of the arc-shaped limiting groove is connected to the guide groove.

[0014] Preferably, a mounting hole is provided at one end of the fixed pin away from the limit head, a plurality of sliding holes are provided on the side wall of the fixed pin, the plurality of sliding holes are distributed in a circular array about the central axis of the fixed pin, a limit rod is slidably provided in the sliding hole, one end of the limit rod extends to the outside of the fixed pin, and the other end of the limit rod extends into the mounting hole, a baffle is provided on the outer wall of the limit rod, the baffle is located in the mounting hole, and a first spring is provided between the baffle and the inner wall of the mounting hole.

[0015] Preferably, a sliding column is slidably arranged in the mounting hole, one end of the sliding column extends to the outside of the mounting hole and is provided with a pull plate, and a guide platform is arranged at the other end of the sliding column. The guide platform is in the shape of a truncated cone, and the diameter of the guide platform close to the pull plate is larger than the diameter of the guide platform away from the pull plate. The end of the guide platform away from the pull plate is connected to one end of the second spring, and the other end of the second spring is connected to the inner wall of the mounting hole. A rotating shaft is arranged at one end of the limit rod close to the guide platform, and a roller is rotatably arranged on the rotating shaft, and the roller contacts the outer wall of the guide platform.

[0016] The technical solution of the utility model has the following advantages: the utility model provides an auxiliary pressure head replacement device for a mechanical properties testing machine, which relates to the technical field of mechanical properties testing, including a connection seat arranged at the output end of a driving member, a first plug hole arranged on the side wall of the connection seat, a connection hole arranged in the connection seat, the connection hole being connected to the first plug hole, a connection column slidably arranged in the connection hole, the lower end of the connection column extending to the outside of the connection hole and connected to the pressure head body, a second plug hole corresponding to the first plug hole arranged in the connection column, a fixing pin arranged in the second plug hole, and both ends of the fixing pin respectively extending through the first plug hole to the outside of the connection seat. In the utility model, the connection column is inserted into the connection hole of the connection seat, and then the fixing pin is inserted into the first plug hole and the second plug hole in turn, so that the connection column can be fixed in the connection seat, and the installation of the pressure head body is completed. The connection column can be separated from the connection seat by pulling out the fixing pin, and the pressure head body can be quickly disassembled, which shortens the time for the staff to replace the pressure head body and improves the work efficiency.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the devices specifically pointed out in the written description and the drawings of the description.

[0018] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the auxiliary pressure head replacement device for the mechanical properties testing machine of the utility model;

[0021] Figure 2 This is a schematic diagram of the connection column and the connection seat in the utility model in a separated state;

[0022] Figure 3 For this utility model Figure 1 Partial cross-sectional view at AA in the middle;

[0023] Figure 4 For this utility model Figure 3 A magnified view of the structure at B in the middle;

[0024] Figure 5 This is a schematic diagram of the guide block and guide groove structure in the utility model;

[0025] Figure 6 This is a schematic diagram of the fixed latch structure in the utility model;

[0026] Figure 7 This is a schematic diagram of the connection between the limit rod and the connecting seat in the utility model;

[0027] Figure 8 For this utility model Figure 7 Enlarged view of the structure at point C in the middle.

[0028] In the figure: 1. connecting seat; 2. first plug hole; 3. connecting hole; 4. connecting column; 5. pressure head body; 6. second plug hole; 7. fixing pin; 8. limit head; 9. limit plate; 10. guide groove; 11. guide block; 12. arc limit groove; 13. mounting hole; 14. sliding hole; 15. limit rod; 16. baffle; 17. first spring; 18. sliding column; 19. pull plate; 20. guide table; 21. second spring; 22. roller. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Embodiment 1:

[0032] The utility model embodiment provides an auxiliary pressure head replacement device for a mechanical properties testing machine, such as Figure 1-Figure 8 As shown, it includes: a connecting base 1 arranged at the output end of the driving member, a first socket 2 is arranged on the side wall of the connecting base 1, a connecting hole 3 is arranged in the connecting base 1, the connecting hole 3 is communicated with the first socket 2, a connecting column 4 is slidably arranged in the connecting hole 3, the lower end of the connecting column 4 extends to the outside of the connecting hole 3 and is connected to the pressure head body 5, a second socket 6 corresponding to the first socket 2 is arranged in the connecting column 4, a fixing pin 7 is arranged in the second socket 6, and both ends of the fixing pin 7 respectively pass through the first socket 2 and extend to the outside of the connecting base 1.

[0033] The working principle and beneficial effects of the above technical solution are as follows: the connecting seat 1 is arranged at the output end of the driving member, the driving member is any one of a hydraulic cylinder, an electric cylinder, and a cylinder, the driving member can drive the connecting seat 1 to move up and down, the side wall of the connecting seat 1 is horizontally provided with a first plug hole 2, the front and rear ends of the first plug hole 2 respectively penetrate the front and rear side walls of the connecting seat 1, a connecting hole 3 is arranged inside the connecting seat 1, the lower end of the connecting hole 3 is connected to the outside of the connecting seat 1, and the first plug hole 2 penetrates the connecting hole 3, the connecting column 4 is detachably connected to the connecting seat 1 through a fixing pin 7, when installing the pressure head body 5, first insert the upper end of the connecting column 4 into the connecting hole 3, align the first plug hole 2 with the second plug hole 6, Then insert one end of the fixing pin 7 from the first socket 2 at the front end, and after passing through the second socket 6, the fixing pin 7 passes through the first socket 2 at the rear end to pass out of the outside of the connecting seat 1. The length of the fixing pin 7 is greater than the sum of the lengths of the first socket 2 and the second socket 6. At this time, the connecting column 4 is fixed in the connecting hole 3 of the connecting seat 1. At this time, the installation of the pressure head body 5 is completed. For different fastener tests, if the pressure head body 5 needs to be replaced, pull the fixing pin 7 out of the first socket 2 and the second socket 6, and then the connecting column 4 can be pulled out from the connecting hole 3, and the pressure head body 5 can be removed. Select a different pressure head body 5 for installation to ensure the smooth progress of the test. In the utility model, the installation of the pressure head body 5 can be completed by inserting the fixing pin 7 into the first socket 2 and the second socket 6 in sequence, and the pressure head body 5 can be quickly disassembled by pulling the fixing pin 7 out of the first socket 2 and the second socket 6. Compared with the existing threaded connection method, there is no need to twist the pressure head body 5 laboriously, which realizes the rapid replacement of the pressure head body 5, shortens the time for the staff to replace the pressure head body 5, improves the work efficiency, and there is no problem of thread damage during use, thereby extending the service life of the pressure head body 5.

[0034] Example 2

[0035] On the basis of the above-mentioned embodiment 1, Figure 4 As shown, a limit head 8 is provided at one end of the fixed latch 7;

[0036] The area of ​​the end of the limiting head 8 close to the fixing pin 7 is larger than the radial cross-sectional area of ​​the first plug hole 2 .

[0037] The working principle and beneficial effects of the above technical solution are as follows: when the fixed pin 7 is inserted into the first socket 2 and the second socket 6, pushing the limit head 8 can drive the fixed pin 7 to slide, so that the fixed pin 7 is smoothly inserted into the first socket 2 and the second socket 6. When the limit head 8 contacts the outer wall of the connecting seat 1, the fixed pin 7 cannot be inserted further, thereby preventing the fixed pin 7 from being inserted too long and unable to be pulled out; the fixed pin 7 can be pulled out of the first socket 2 and the second socket 6 by pulling the limit head 8, which facilitates the removal of the fixed pin 7 and realizes the rapid replacement of the pressure head body 5.

[0038] Example 3

[0039] On the basis of Example 1 or 2, Figure 2 As shown, a limiting plate 9 is disposed on the outer wall of the connecting column 4 , and the diameter of the limiting plate 9 is greater than the diameter of the connecting hole 3 .

[0040] The working principle and beneficial effects of the above technical solution are as follows: when the limit plate 9 contacts the bottom wall of the connecting seat 1, the central axes of the first socket 2 and the second socket 6 are at the same height, which facilitates the alignment of the first socket 2 and the second socket 6, shortens the time for adjusting the connecting column 4 up and down, and improves the installation efficiency of the pressure head body 5.

[0041] Example 4

[0042] On the basis of any one of Examples 1-3, the central axis of the first plug hole 2 and the central axis of the second plug hole 6 are on the same straight line, and the central axis of the first plug hole 2 is perpendicular to the central axis of the connecting hole 3.

[0043] The working principle and beneficial effects of the above technical solution are as follows: the diameter of the first socket 2 is equal to the diameter of the second socket 6, and the outer wall of the fixed pin 7 is slidably connected with the inner wall of the first socket 2 and the inner wall of the second socket 6 respectively, which reduces the distance that the connecting column 4 shakes up and down in the connecting seat 1, thereby improving the stability of the pressure head body 5, and a vertical guide groove is arranged on the inner wall of the connecting hole 3, and a guide ridge corresponding to the guide groove is arranged on the outer wall of the connecting column 4, and the guide ridge is slidably connected with the inner wall of the guide groove. When installing the connecting column 4, align the guide ridge with the guide groove, so as to ensure that after the connecting column 4 is inserted into the connecting hole 3, the central axis of the first socket 2 and the second socket 6 are on the same straight line.

[0044] Example 5

[0045] On the basis of any one of Examples 2-4, Figure 5 , Figure 6 As shown, a guide groove 10 is provided on the side wall of the fixed pin 7, and the guide groove 10 is provided along the axial direction of the fixed pin 7. A guide block 11 is provided on the inner wall of the first plug hole 2, and one end of the guide block 11 is fixedly connected to the inner wall of the first plug hole 2, and the other end of the guide block 11 extends into the guide groove 10 and is slidably connected to the inner wall of the guide groove 10;

[0046] The length of the guide groove 10 is equal to the length of the fixing pin 7;

[0047] An arc-shaped limiting groove 12 is arranged on the outer periphery of the fixing pin 7 , and one end of the arc-shaped limiting groove 12 is connected to the guide groove 10 .

[0048] The working principle and beneficial effects of the above technical solution are as follows: a long strip guide groove 10 is arranged on the outer wall of the fixed pin 7, the guide groove 10 is arranged along the axial direction of the fixed pin 7, the two ends of the guide groove 10 respectively pass through the two ends of the fixed pin 7, a guide block 11 is arranged at one end of the first plug hole 2 close to the limit head 8, when installing the fixed pin 7, the guide groove 10 is aligned with the guide block 11, and then the fixed pin 7 can be inserted into the first plug hole 2 along the guide block 11, providing a guide for the insertion of the fixed pin 7, an arc-shaped limit groove 12 is arranged on the outer periphery of the fixed pin 7, when the limit head 8 When in contact with the outer wall of the connecting seat 1, the arc-shaped limit groove 12 is aligned with the guide block 11. At this time, rotating the fixed pin 7 can make the guide block 11 slide into the arc-shaped guide groove 10, and the fixed pin 7 cannot be pulled out from the first plug hole 2, preventing the staff from misoperating and causing the pressure head body 5 to fall, thereby improving safety. When the pressure head body 5 needs to be replaced, the fixed pin 7 is rotated in the opposite direction to make the guide block 11 slide into the guide groove 10, and the fixed pin 7 can be pulled out, so that the connecting column 4 is separated from the connecting seat 1. The operation is simple and it is convenient for the rapid replacement of the pressure head body 5.

[0049] Example 6

[0050] On the basis of any one of Examples 2-5, Figure 7 , Figure 8 As shown, a mounting hole 13 is provided at one end of the fixed pin 7 away from the limit head 8, a plurality of sliding holes 14 are provided on the side wall of the fixed pin 7, and the plurality of sliding holes 14 are distributed in a circular array about the central axis of the fixed pin 7, a limit rod 15 is slidably provided in the sliding hole 14, one end of the limit rod 15 extends to the outside of the fixed pin 7, and the other end of the limit rod 15 extends into the mounting hole 13, a baffle 16 is provided on the outer wall of the limit rod 15, the baffle 16 is located in the mounting hole 13, and a first spring 17 is provided between the baffle 16 and the inner wall of the mounting hole 13.

[0051] The working principle and beneficial effects of the above technical solution are as follows: one end of the fixing pin 7 away from the limiting head 8 passes through the first plug hole 2 at the rear end and extends to the outside of the connecting seat 1. Under the action of the first spring 17, the exposed end of the limiting rod 15 can contact the outer wall of the connecting seat 1. Under the joint action of the limiting head 8 and the limiting rod 15, the fixing pin 7 can be limited to prevent the fixing pin 7 from sliding in the second plug hole 6, thereby improving the stability of the fixing pin 7 and preventing the connecting column 4 from separating from the connecting seat 1; the limiting rod 15 is pressed toward the direction of the mounting hole 13, and the limiting rod 15 slides along the sliding hole 14. When the exposed end of the limiting rod 15 slides into the sliding hole 14, the fixing pin 7 can be pulled outward by the limiting head 8, thereby pulling out the fixing pin 7. Similarly, when installing the fixing pin 7, the limiting rod 15 must be pressed into the sliding hole 14 first before the fixing pin 7 can be inserted into the first plug hole 2, thereby improving the reliability of the installation of the pressure head body 5.

[0052] Example 7

[0053] On the basis of Example 6, Figure 7 , Figure 8 As shown, a sliding column 18 is slidably arranged in the mounting hole 13, one end of the sliding column 18 extends to the outside of the mounting hole 13 and is provided with a pull plate 19, and a guide platform 20 is arranged at the other end of the sliding column 18. The guide platform 20 is in the shape of a truncated cone, and the diameter of the end of the guide platform 20 close to the pull plate 19 is larger than the diameter of the end of the guide platform 20 away from the pull plate 19, the end of the guide platform 20 away from the pull plate 19 is connected to one end of a second spring 21, and the other end of the second spring 21 is connected to the inner wall of the mounting hole 13, and a rotating shaft is arranged at one end of the limit rod 15 close to the guide platform 20, and a roller 22 is rotatably arranged on the rotating shaft, and the roller 22 contacts the outer wall of the guide platform 20.

[0054] The working principle and beneficial effects of the above technical solution are as follows: under the action of the second spring 21, the outer wall of one end of the guide platform 20 close to the pull plate 19 contacts the roller 22, and at this time, the limit rod 15 cannot be pressed toward the mounting hole 13, so as to prevent the staff from loosening the fixed latch 7 due to misoperation. When removing the fixed latch 7, the sliding column 18 is first pulled downward by the pull plate 19, and the sliding column 18 drives the guide platform 20 to move toward the outside of the mounting hole 13, the second spring 21 is stretched, and then the limit rod 15 is pressed, so that the limit rod 15 can slide into the sliding hole 14, thereby The fixing pin 7 can be pulled out; when installing the fixing pin 7, the pull plate 19 is also pulled first, and the limiting rod 15 is pressed into the sliding hole 14, and then the fixing pin 7 is inserted into the first plug hole 2. When the limiting rod 15 moves from the first plug hole 2 at the rear end to the outside of the connecting seat 1, under the action of the first spring 17, the limiting rod 15 slides to the outside of the sliding hole 14 and contacts the outer wall of the connecting seat 1. Under the action of the second spring 21, the pull plate 19 returns to its original position, the guide platform 20 returns to its original position and squeezes the roller 22, thereby improving the stability of the limiting rod 15.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Auxiliary pressure head replacement device for mechanical properties testing machine, characterized in that: include: A connecting seat (1) is arranged at the output end of the driving member, a first plug hole (2) is arranged on the side wall of the connecting seat (1), a connecting hole (3) is arranged inside the connecting seat (1), the connecting hole (3) is communicated with the first plug hole (2), a connecting column (4) is slidably arranged inside the connecting hole (3), the lower end of the connecting column (4) extends to the outside of the connecting hole (3) and is connected to the pressure head body (5), a second plug hole (6) corresponding to the first plug hole (2) is arranged inside the connecting column (4), a fixing pin (7) is arranged inside the second plug hole (6), and both ends of the fixing pin (7) respectively pass through the first plug hole (2) and extend to the outside of the connecting seat (1).

2. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 1, characterized in that: A limit head (8) is arranged at one end of the fixed latch (7).

3. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 2, characterized in that: The area of ​​the end of the limiting head (8) close to the fixing pin (7) is larger than the radial cross-sectional area of ​​the first plug hole (2).

4. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 1, characterized in that: A limiting plate (9) is provided on the outer wall of the connecting column (4), and the diameter of the limiting plate (9) is greater than the diameter of the connecting hole (3).

5. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 1, characterized in that: The central axis of the first plug hole (2) and the central axis of the second plug hole (6) are on the same straight line, and the central axis of the first plug hole (2) is perpendicular to the central axis of the connecting hole (3).

6. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 2, characterized in that: A guide groove (10) is provided on the side wall of the fixed pin (7), and the guide groove (10) is provided along the axial direction of the fixed pin (7). A guide block (11) is provided on the inner wall of the first plug hole (2), and one end of the guide block (11) is fixedly connected to the inner wall of the first plug hole (2), and the other end of the guide block (11) extends into the guide groove (10) and is slidably connected to the inner wall of the guide groove (10).

7. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 6, characterized in that: The length of the guide groove (10) is equal to the length of the fixing pin (7).

8. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 6, characterized in that: An arc-shaped limiting groove (12) is arranged on the outer periphery of the fixed latch (7), and one end of the arc-shaped limiting groove (12) is connected to the guide groove (10).

9. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 2, characterized in that: A mounting hole (13) is provided at one end of the fixed pin (7) away from the limiting head (8), a plurality of sliding holes (14) are provided on a side wall of the fixed pin (7), the plurality of sliding holes (14) are distributed in a ring array about the central axis of the fixed pin (7), a limiting rod (15) is slidably provided in the sliding hole (14), one end of the limiting rod (15) extends to the outside of the fixed pin (7), and the other end of the limiting rod (15) extends into the mounting hole (13), a baffle (16) is provided on the outer wall of the limiting rod (15), the baffle (16) is located in the mounting hole (13), and a first spring (17) is provided between the baffle (16) and the inner wall of the mounting hole (13).

10. The auxiliary pressure head replacement device for a mechanical properties testing machine according to claim 9, characterized in that: A sliding column (18) is slidably arranged in the mounting hole (13), one end of the sliding column (18) extends to the outside of the mounting hole (13) and is provided with a pull plate (19), a guide platform (20) is arranged at the other end of the sliding column (18), the guide platform (20) is in a truncated cone shape, the diameter of the end of the guide platform (20) close to the pull plate (19) is larger than the diameter of the end of the guide platform (20) away from the pull plate (19), the end of the guide platform (20) away from the pull plate (19) is connected to one end of a second spring (21), the other end of the second spring (21) is connected to the inner wall of the mounting hole (13), a rotating shaft is arranged at one end of the limiting rod (15) close to the guide platform (20), a roller (22) is rotatably arranged on the rotating shaft, and the roller (22) contacts the outer wall of the guide platform (20).

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