Lever group structure of durometer

Abstract

The utility model discloses a hardometer lever group structure, which belongs to the technical field of hardometers and comprises a base, a lever group, a lever group, a lever group, a lever group and a lever group, one end of the lever is hinged in the mounting cavity, and the other end of the lever extends out of the base; the top sleeve is installed in the graphite copper sleeve in a sliding mode, a flange is arranged at the end, located in the installation cavity, of the top sleeve, and a spring is arranged on the top sleeve between the flange and the graphite copper sleeve in a sleeving mode; and the positioning disc is fixed at one end, extending out of the graphite copper sleeve, of the top sleeve. According to the utility model, the graphite copper sleeve is used, and the self-lubricating property of the graphite copper sleeve is utilized, so that the ejector sleeve moves in the graphite copper sleeve, stable and accurate guidance can be provided for the measuring part and the ejector rod, the problem of shaking generated by using a ball bearing in the past is avoided, the influence of abrasion on precision is effectively reduced, and the accuracy and the stability of measurement are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hardness tester, concretely relates to a hardness tester lever group structure. BACKGROUND

[0002] In the field of material science and engineering, hardness is one of the important indicators to measure the ability of resisting local pressure deformation of materials, and it is of great significance to evaluate the mechanical properties, wear resistance and service life of materials. Hardness tester, as a professional equipment for measuring material hardness, is widely used in hardness testing of various materials such as metal, plastic, rubber and ceramic. Lever group structure is one of the main components of hardness tester.

[0003] In the traditional lever group structure, linear bearing is used as the guide for the movement of the top rod, but linear bearing adopts ball to reduce friction, which leads to the wear of ball after long-term use of the equipment, affects the concentricity, and thus reduces the accuracy of the hardness tester, so it is necessary to optimize the structure of the lever group and improve the durability of the hardness tester. SUMMARY

[0004] In view of the above technical problems, the utility model aims to provide a hardness tester lever group structure which can improve the accuracy of guidance and increase the durability of the hardness tester.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: the utility model provides a hardness tester lever group structure, which comprises:

[0006] A base is fixed in the shell of the hardness tester, and a through hole and a mounting cavity are formed in the base;

[0007] A lever is hingedly connected at one end in the mounting cavity and extends out of the base at the other end;

[0008] A graphite copper sleeve is fixed at one end of the through hole;

[0009] A top sleeve is slidingly installed in the graphite copper sleeve, and a flange is arranged at one end of the top sleeve in the mounting cavity, and a spring is arranged on the top sleeve between the flange and the graphite copper sleeve;

[0010] A positioning disc is fixed at one end of the top sleeve extending out of the graphite copper sleeve;

[0011] A top rod is inserted into the top sleeve, and a measuring part is connected to one end of the top rod extending out of the positioning disc, and the measuring part is fixedly connected to the positioning disc;

[0012] When the lever is rotated, the lever pushes the top sleeve to move along the axis of the graphite copper sleeve, so that the measuring part extrudes the object to be detected.

[0013] Preferably, the lever is provided with a pressing part, and a distance between the pressing part and the top sleeve is less than a distance between the top sleeve and the hinge shaft.

[0014] Preferably, the pressing part has an arc-shaped curved surface, and a plurality of slot holes are formed in the arc-shaped curved surface, and the slot holes are filled with graphite.

[0015] Preferably, the graphite copper sleeve is fixed on the base through bolts.

[0016] Preferably, a limiting hole is formed in a circumferential surface of the positioning disc, and a locking bolt is threadedly installed in the limiting hole, and the locking bolt is used for abutting against the top sleeve.

[0017] Preferably, a gap slot is formed in the lever and used for allowing the top rod to pass through.

[0018] The utility model discloses the beneficial effect lies in:

[0019] The utility model discloses the graphite copper sleeve, utilizes the self -lubricating of graphite copper sleeve, and the top sleeve moves in graphite copper sleeve, can provide stable accurate direction for the measurement part and top rod, avoided the shaking problem of using the ball bearing of the previous generation, effectively reduced the influence of abrasion on precision, improved the accuracy and stability of measurement, through the design of lever's extrusion part, the contact area between arc-shaped curved surface and top sleeve is reduced, and the graphite is further reduced the friction, and the durability is increased. DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0021] Figure 1 It is a whole structure perspective view of the hardness gauge lever group structure provided by the embodiment of the utility model.

[0022] Figure 2 It is the overall structure front view of the utility model.

[0023] Figure 3 It is the overall structure plan view of the utility model.

[0024] Figure 4 It is Figure 3 The sectional view at A-A.

[0025] Explanation of reference signs:

[0026] 1. Base, 2. Through hole, 3. Mounting cavity, 4. Lever, 5. Graphite copper sleeve, 6. Top sleeve, 7. Flange, 8. Spring, 9. Positioning plate, 10. Top rod, 11. Extrusion part, 12. Slot, 13. Limiting hole, 14. Relief groove, 15. Hinge shaft. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1:

[0029] like Figures 1 to 4 As shown, this utility model provides a four-unit lever structure for a hardness tester, including a base 1, which is securely mounted inside the hardness tester housing by bolts. The base 1 has a through hole 2 and a mounting cavity 3, which are used for mounting and positioning subsequent components, respectively. A lever 4 is disposed in the mounting cavity 3. One end of the lever 4 is hinged to the mounting cavity 3 within the base 1, ensuring that the lever 4 can rotate freely, while the other end of the lever 4 extends outside the base 1 to increase the lever arm and connect to other components.

[0030] like Figure 4 As shown, a graphite copper sleeve 5 is installed in the through hole 2 of the base 1. The graphite copper sleeve 5 is tightly fixed to the base 1 with bolts to ensure its stability and durability. The surface of the graphite copper sleeve 5 has graphite columns. Due to the self-lubricating properties of graphite, friction is reduced and good lubrication is provided. A top sleeve 6 is slidably inserted into the graphite copper sleeve 5. The top sleeve 6 and the inner wall of the graphite copper sleeve 5 are lubricated by graphite. The large contact area between the inner wall of the graphite copper sleeve 5 and the top sleeve 6 results in smoother, more precise guidance and greater durability. One end of the top sleeve 6 extends out of the base 1, and the other end extends into the mounting cavity 3. The end of the top sleeve 6 in the mounting cavity 3 has a flange 7. A spring 8 is fitted on the top sleeve 6 between the flange 7 and the graphite copper sleeve 5. When the lever 4 rotates in the base 1 around the hinge shaft 15, the lever 4 can push the top sleeve 6 to compress the spring 8, causing the other end of the top sleeve 6 to move away from the lever 4.

[0031] Spring 8 provides a restoring force to top sleeve 6 when lever 4 returns to its original position, ensuring the stability of the structure and the accuracy of the measurement. At the same time, spring 8 prevents lever 4 from applying excessive force to top sleeve 6, thus preventing deformation and damage.

[0032] like Figure 4As shown in the drawings, the top sleeve 6 extends out of the graphite copper sleeve 5 from one end of the lever 4, and a positioning disc 9 is fixed at the end of the top sleeve 6. The positioning disc 9 is used to connect the measuring part and the top sleeve 6. A limiting hole 13 is formed in the circumferential surface of the positioning disc 9, and a locking bolt is screwed in the limiting hole 13. By tightening the locking bolt, the locking bolt can abut against the top sleeve 6, so that the positioning disc 9 is firmly fixed on the top sleeve 6, and unnecessary movement of the positioning disc 9 during work is prevented.

[0033] A top rod 10 is inserted into the top sleeve 6, and one end of the top rod 10 extends out of the positioning disc 9 and is connected with the measuring part. The stable connection between the measuring part and the positioning disc 9 through the bolt fixing ensures the stability of the whole. When the lever 4 is rotated, the lever 4 pushes the top sleeve 6 to move along the axis of the graphite copper sleeve 5, and then the top rod 10 and the measuring part press the object to be detected, and the hardness measurement is completed.

[0034] Example two:

[0035] On the basis of example one, in order to improve the structural strength of the lever 4, the thickness of the lever 4 is about the size of the inner wall of the mounting cavity 3, but in this way, the lever 4 will interfere with the top rod 10. As shown in the drawings, Figure 4 In order to ensure that the top rod 10 will not be hindered during movement, the lever 4 is also provided with a giving slot 14 for the top rod 10 to pass through. This design not only ensures the free movement of the top rod 10, but also ensures that the lever 4 will not abut against the top rod 10 when the lever 4 is rotated.

[0036] Example three:

[0037] On the basis of the above examples, in order to optimize the pushing effect of the lever 4 and reduce the friction between the lever 4 and the top sleeve 6, the utility model specially provides an extrusion part 11 on the lever 4. As shown in the drawings, Figure 4 The extrusion part 11 is basically close to the top sleeve 6, and the distance between the extrusion part 11 and the top sleeve 6 is less than the distance between the top sleeve 6 and the hinge shaft 15. In this way, the lever 4 can rotate a smaller angle to make the extrusion part 11 push the top sleeve 6 to move a larger distance, and the pushing efficiency is improved. The surface of the extrusion part 11 is designed as an arc curved surface, which can reduce the contact surface between the extrusion part 11 and the top sleeve 6. A plurality of slot holes 12 are formed in the curved surface, and graphite is filled in the slot holes 12. In this way, when the extrusion part 11 rotates to extrude the top sleeve 6, the graphite can be lubricated, and the friction is further reduced, and the lubricity and durability of the structure are improved.

[0038] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Therefore, if these modifications and variations of the utility model belong to the scope of the claims of the utility model and the equivalent technologies thereof, the utility model also intends to include these modifications and variations.

Claims

1. A hardness tester lever set structure, characterized by, The utility model relates to a hardness tester, which comprises a base (1) fixed in the shell of the hardness tester, a through hole (2) and a mounting cavity (3) being formed in the base (1), a lever (4) hinged at one end in the mounting cavity (3) and extending out of the base (1), a graphite copper sleeve (5) fixed at one end of the through hole (2), a top sleeve (6) slidingly mounted in the graphite copper sleeve (5), the top sleeve (6) being provided with a flange (7) at one end located in the mounting cavity (3), a spring (8) being sleeved on the top sleeve (6) between the flange (7) and the graphite copper sleeve (5), a positioning disc (9) fixed at one end of the top sleeve (6) extending out of the graphite copper sleeve (5), a top rod (10) inserted in the top sleeve (6), the top rod (10) being connected with a measuring part at one end extending out of the positioning disc (9), the measuring part being fixedly connected with the positioning disc (9). When the lever (4) is rotated, the lever (4) pushes the top sleeve (6) to move along the axis of the graphite copper sleeve (5), so that the measuring part is pressed against the object to be detected. The lever (4) is provided with a pressing part (11), the distance between the pressing part (11) and the top sleeve (6) being smaller than the distance between the top sleeve (6) and the hinged shaft (15). The pressing part (11) has an arc-shaped curved surface, a plurality of slot holes (12) being formed in the arc-shaped curved surface, and the slot holes (12) being filled with graphite. The graphite copper sleeve (5) is fixed on the base (1) by means of bolts. The positioning disc (9) is provided with a limiting hole (13) formed in the circumferential surface, a locking bolt being threadedly mounted in the limiting hole (13) and used for abutting against the top sleeve (6). The lever (4) is provided with a giving-up slot (14) for the top rod (10) to pass through. ​ 2. A hardness tester lever set structure according to claim 1, wherein ​ 3. A hardness tester lever set structure according to claim 2, wherein ​ 4. A hardness tester lever set structure as claimed in claim 1, wherein ​ 5. A hardness tester lever set structure as claimed in claim 1, wherein ​ 6. A hardness tester lever set structure as claimed in claim 1, wherein ​

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