A durometer loading and unloading device

Abstract

The application relates to a hardness tester loading and unloading device which comprises a loading and unloading base, a loading and unloading lever, a motor, an eccentric wheel, a travel switch and a roller, the loading and unloading lever comprises a connecting shaft, a gap is arranged on the side of the loading and unloading lever away from the lever frame, the roller is arranged at the gap, the eccentric wheel is fixed at the output shaft of the motor, the travel switch is fixed below the eccentric wheel, and the travel switch comprises trigger pieces arranged side by side. The application has the advantages of simple structure and easy processing; the device can convert the rotary motion of the motor into the swing of the lever, amplifies the small eccentric distance through the load lever, and the swing stroke of the lever is enough to lift the up-and-down stroke of the weight; since the outer circle of the eccentric wheel is a whole circle and does not have a transition curve in the middle, the loading and unloading is stable, there is no test force impact phenomenon, the weight is slowly lifted when the device runs to the highest point of the eccentric wheel, unloading is realized, and the weight is slowly dropped when the device runs to the lowest point of the eccentric wheel, loading is realized.

Description

Technical Field

[0001] This application relates to the field of hardness testing equipment technology, and more specifically, to a hardness tester loading and unloading device. Background Technology

[0002] Hardness is an important indicator of the mechanical properties of metallic and alloy materials. It generally refers to the ability of a material to resist the indentation of a harder object of a certain shape and size without causing residual deformation. A hardness tester is a precision instrument used to determine the hardness of materials. Its core principle is to assess the hardness by measuring the material's resistance to indentation or impact from an external object.

[0003] A typical weight-applied hardness tester consists of the following parts: body, main shaft and large lever assembly, loading and unloading device, load changing device, weight assembly, lifting screw assembly, front panel display assembly, and electrical components. In existing technology, the loading and unloading device with buffer function used on Rockwell hardness testers requires the addition of a buffer, linkage mechanism, and control mechanism to the hardness tester. This design is complex, and a large linkage extends from the bottom of the machine to the large lever at the top, with the loading and unloading action controlled by a handle or motor. Due to the excessive length of the linkage, jamming can occur during loading. Furthermore, the buffer requires excellent sealing; poor sealing can lead to impact during loading, causing the test force to exceed tolerances, and increasing manufacturing difficulty. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a hardness tester loading and unloading device. This device has a simple structure and can convert the rotational motion of the motor into the swing of the lever. The small eccentricity is amplified by the loading and unloading lever, and the swing stroke of the lever is sufficient to lift the up and down stroke of the weight. Since the outer circle of the eccentric wheel is a complete circle without any transition curve in the middle, the loading and unloading is smooth.

[0005] The objective of this application is achieved through the following technical solution: A hardness tester loading / unloading device includes a loading / unloading base, a loading / unloading lever, a motor, an eccentric wheel, a limit switch, and rollers. The loading / unloading lever is rotatably connected to the loading / unloading base via a lever frame. The loading / unloading lever includes a connecting shaft, and the loading / unloading lever is fixed to one side of the connecting shaft. A gap is provided on the side of the loading / unloading lever away from the lever frame, and a roller is installed in the gap. A connecting plate is fixed to the side of the loading / unloading base away from the lever frame, and a motor is fixed to one side of the connecting plate. An eccentric wheel is fixed to the output shaft of the motor. The rollers cooperate with the eccentric wheel. A limit switch is fixed below the eccentric wheel. The limit switch includes trigger plates arranged side by side. The eccentric wheel has contact plates A and B, which respectively cooperate with the trigger plates.

[0006] As a further improvement of this application, the ends of the contact A and the contact B are located on different vertical planes, wherein the contact B is provided with an inflection point, and the contact A and the contact B are respectively matched with different trigger pieces.

[0007] As a further improvement of this application, the trigger piece includes trigger piece A and trigger piece B, and the distance between trigger piece A and trigger piece B is equal to the distance between contact piece A and contact piece B.

[0008] As a further improvement of this application, the end of the loading / unloading lever away from the lever frame is provided with a groove, and a weight is provided below the groove.

[0009] As a further improvement of this application, the limit switch is fixed to the loading / unloading base on the side facing the eccentric wheel by a fixed bending plate, wherein the eccentric wheel and the limit switch are located on the same side of the connecting plate.

[0010] As a further improvement of this application, the loading and unloading device also includes an external power supply, which is electrically connected to the motor.

[0011] As a further improvement of this application, the end groove of the loading / unloading lever is engaged with the body lever by a lifting ring, and the loading / unloading base is fixed to the body.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This utility model has a simple structure and is easy to process. Both the eccentric wheel and the loading / unloading lever are easy to process, and the highest and lowest points of the eccentric wheel are also easy to find. After fixing the contacts A and B, they contact the corresponding limit switches respectively, and the positioning is accurate. This device can convert the rotational motion of the motor into the swing of the lever. The small eccentricity is amplified by the loading / unloading lever, and the swing stroke of the lever is sufficient to lift the weight up and down. Since the outer circle of the eccentric wheel is a complete circle without a transition curve in the middle, the loading and unloading are smooth and there is no impact phenomenon of test force. When the eccentric wheel reaches its highest point, the weight is slowly lifted to achieve unloading, and when the eccentric wheel reaches its lowest point, the weight is slowly lowered to achieve loading. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of a hardness tester is provided for some embodiments of this application; Figure 2 A front view of the loading and unloading device provided for some embodiments of this application; Figure 3 Front view of the loading / unloading device provided for some embodiments of this application; Figure 4 A top view of a loading / unloading device provided for some embodiments of this application.

[0014] Icons: 1. Loading / unloading base; 2. Loading / unloading lever; 3. Motor; 4. Eccentric wheel; 5. Limit switch; 6. Roller; 7. Lever frame; 8. Connecting shaft; 9. Clearance; 10. Connecting plate; 11. Contact A; 12. Contact B; 13. Inflection point; 14. Trigger A; 15. Trigger B; 16. Groove; 17. Body; 18. Body lever; 19. Lifting ring; 20. Lifting rod; 21. Multi-stage weights; 22. Load changing mechanism; 23. Electrical components; 24. Lead screw seat; 25. Handle; 26. Lead screw; 27. Pressure head; 28. Spindle seat; 29. ​​Hardness display dial. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0017] Appendix Figure 1 A hardness tester device includes the loading and unloading device proposed in this application, and further includes a body 17, a body lever 18, a lifting ring 19, a lifting rod 20, multi-stage weights 21, a load-changing mechanism 22, electrical components 23, a lead screw seat 24, a handle 25, a lead screw 26, an indenter 27, a main shaft 28, and a hardness display dial 29, as detailed in the appendix. Figure 1 .

[0018] This application discloses a hardness tester loading / unloading device, comprising a loading / unloading base 1, a loading / unloading lever 2, a motor 3, an eccentric wheel 4, a limit switch 5, and a roller 6. The loading / unloading lever 2 is rotatably engaged with the loading / unloading base 1 via a lever frame 7. The loading / unloading lever 2 includes a connecting shaft 8, with the loading / unloading lever 2 fixed to one side of the connecting shaft 8. A gap 9 is provided on the side of the loading / unloading lever 2 away from the lever frame 7, and the roller 6 is rotatably mounted at the gap 9, allowing free rotation within the gap 9. A connecting plate 10 is fixed to the side of the loading / unloading base 1 away from the lever frame 7. The length direction of the connecting plate 10 is consistent with that of the loading / unloading lever 2. A motor 3 is fixed on one side of the connecting plate 10. An eccentric wheel 4 is fixed at the output shaft of the motor 3. The axis of the eccentric wheel 4 is not coaxial with the axis of the output shaft of the motor 3. The roller 6 cooperates with the eccentric wheel 4. The eccentric wheel 4 is used to drive the roller 6 to rotate and lift the loading / unloading lever 2. A limit switch 5 is fixed below the eccentric wheel 4. The limit switch 5 includes trigger plates arranged side by side. The eccentric wheel 4 is provided with contact plate A11 and contact plate B12. Contact plate A11 and contact plate B12 cooperate with the trigger plate respectively.

[0019] Specifically, the ends of contact A11 and contact B12 are not on the same horizontal plane. Contact B12 has an inflection point 13, which can be regarded as contact B12 being concave inward. When the motor 3 is working, contact B12 and contact A11 run on different horizontal planes, and contact A11 and contact B12 cooperate with different trigger pieces respectively.

[0020] Specifically, the trigger piece includes trigger piece A14 and trigger piece B15. The distance between trigger piece A14 and trigger piece B15 is equal to the distance between contact piece A11 and contact piece B12. When the motor 3 is working, trigger piece A14 and contact piece A11 are engaged, and trigger piece B15 and contact piece B12 are separated. The included angle between contact piece A11 and contact piece B12 is 180°.

[0021] Among them, the end of the loading / unloading lever 2 away from the lever frame 7 is provided with a groove 16, and a weight is provided below the groove 16.

[0022] Specifically, the limit switch 5 is fixed to the loading and unloading base 1 on the side facing the eccentric wheel 4 by a fixed bending plate, wherein the eccentric wheel 4 and the limit switch 5 are located on the same side of the connecting plate 10, and the limit switch 5 is used to send a signal to the motor 3, thereby controlling the working state of the motor 3.

[0023] The loading and unloading device also includes an external power supply, which is electrically connected to the motor 3.

[0024] Specifically, the end groove 16 of the loading / unloading lever 2 is engaged with the body lever through the lifting ring 19, the loading / unloading base 1 is fixed to the body, and the loading / unloading device and the body lever 18 are operated synchronously through the lifting ring 19.

[0025] When using this utility model, for a hardness tester equipped with the loading and unloading device described in this application, the following steps shall be followed: 1. Select the appropriate load, such as 150 kg, using the variable load mechanism 22 of the hardness tester; 2. Rotate the handle 25 on the lead screw to raise the lead screw 26 carrying the specimen until the specimen contacts the indenter 27. After the pointer on the Rockwell hardness tester dial has rotated 3.5 revolutions, it will align with the dial. For instruments with an electromagnetic braking device, contact with the specimen will trigger the handle 25 to brake. 3. Press the start button or test button to start the motor 3 of the loading and unloading device, which drives the eccentric wheel 4 to rotate. The contact piece A11 leaves the trigger piece A14 until the contact piece B12 touches the trigger piece B15. The motor 3 stops rotating. At this time, the eccentric wheel 4 rotates from the highest point to the lowest point, the loading and unloading lever 2 also rotates from the highest point to the lowest point, and the body lever 18 supported by the loading and unloading lever 2 also rotates from the highest point to the lowest point. The multi-stage weights suspended by the lifting ring and the lifting rod at the end of the body lever 18 also descend from the highest point to the lowest point. During the descent of the weights, the pins on both sides of the weights fall onto the load changing mechanism 22, blocking the weights that do not need to participate in the force addition. The weights that do participate in the force addition continue to fall until the weight of the weights is transmitted to the main shaft through the body lever. The pressure head 27 at the lower end of the main shaft acts on the specimen with the same force, and the test force is added, producing an indentation on the specimen. 4. After a certain period of load holding, motor 3 rotates in the reverse direction, driving eccentric wheel 4 to rotate in the reverse direction as well. Contact piece B12 leaves trigger piece B15 until contact piece A11 touches trigger piece A14, at which point motor 3 stops rotating. At this time, eccentric wheel 4 rotates from the lowest point to the highest point, and loading / unloading lever 2 also rotates from the lowest point to the highest point. The body lever 18 supported by loading / unloading lever 2 also rotates from the lowest point to the highest point. The multi-stage weights 21 suspended by the lifting ring 19 and lifting rod 20 at the tail end of the body lever 18 also rise from the lowest point to the highest point. The main shaft 28 and the lower end indenter 27 also return to their initial positions, completing one loading process. Brinell and Vickers hardness values ​​can be calculated by measuring the indentation diameter or diagonal. Rockwell hardness values ​​are calculated by measuring the indentation depth with initial test force.

[0026] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hardness tester loading and unloading device, comprising a loading and unloading base (1), a loading and unloading lever (2), a motor (3), an eccentric wheel (4), a limit switch (5), and a roller (6), characterized in that, The loading / unloading lever (2) is rotatably engaged with the loading / unloading base (1) via the lever frame (7). The loading / unloading lever (2) includes a connecting shaft (8). The loading / unloading lever (2) is fixed on one side of the connecting shaft (8). The loading / unloading lever (2) has a gap (9) on the side away from the lever frame (7). A roller (6) is installed at the gap (9). A connecting plate (10) is fixed on the side of the loading / unloading base (1) away from the lever frame (7). A motor (3) is fixed on one side of the connecting plate (10). An eccentric wheel (4) is fixed at the output shaft of the motor (3). The roller (6) and the eccentric wheel (4) are in contact with each other. A limit switch (5) is fixed below the eccentric wheel (4). The limit switch (5) includes trigger pieces arranged side by side. The eccentric wheel (4) is provided with a contact piece A (11) and a contact piece B (12). The contact piece A (11) and the contact piece B (12) are respectively engaged with the trigger piece.

2. The hardness tester loading and unloading device according to claim 1, characterized in that, The ends of the contact piece A (11) and the contact piece B (12) are on different vertical planes, wherein the contact piece B (12) is provided with an inflection point (13), and the contact piece A (11) and the contact piece B (12) are respectively matched with different trigger pieces.

3. The hardness tester loading and unloading device according to claim 2, characterized in that, The trigger piece includes trigger piece A (14) and trigger piece B (15), and the distance between trigger piece A (14) and trigger piece B (15) is equal to the distance between contact piece A (11) and contact piece B (12).

4. The hardness tester loading and unloading device according to claim 1, characterized in that, The loading / unloading lever (2) has a groove (16) at its end away from the lever frame (7), and a weight is provided below the groove (16).

5. The hardness tester loading and unloading device according to claim 1, characterized in that, The limit switch (5) is fixed to the loading and unloading base (1) on the side facing the eccentric wheel (4) by a fixed bending plate, wherein the eccentric wheel (4) and the limit switch (5) are located on the same side of the connecting plate (10).

6. The hardness tester loading and unloading device according to claim 1, characterized in that, The loading and unloading device also includes an external power supply, which is electrically connected to the motor (3).

7. The hardness tester loading and unloading device according to claim 4, characterized in that, The end groove (16) of the loading / unloading lever (2) is engaged with the body lever (18) by a lifting ring (19), and the loading / unloading base (1) is fixed to the body.

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