Scratching device convenient to operate and used for corrosion test

Abstract

The utility model discloses a corrosion test scratching device convenient to operate, which belongs to the technical field of coating corrosion test appliances and comprises a penholder and a scratching needle mounted at the bottom end of the penholder. A cavity is formed in the pen holder, a sliding groove communicated with the cavity is formed in the side wall of the pen holder, a bent part bent upwards is arranged at the bottom end of the sliding groove, guide holes are symmetrically formed in the lower portion of the sliding groove, and a connector of a circular structure is movably connected to the inner side of the cavity. The center position of the lower surface of the connector is fixedly connected with an ejector rod, after using is completed, the shifting rod is made to retreat from the top end of the sliding groove, and therefore the connecting end and the scratching needle are pushed into the inner side of the pen holder through the elastic acting force of the spring, and the good protection effect on the scratching needle is achieved; and the scratching pen is convenient to operate in the working process.

Description

Technical Field

[0001] The utility model relates to the technical field of coating corrosion test tools, and more specifically, to a scratch tool for corrosion test which is convenient to operate. Background Art

[0002] The Erichsen 426 scratch pen made in Germany is a portable and general tool: it is used to generate scratches on the coating surface when preparing for corrosion tests, such as salt spray, continuous or intermittent immersion, accelerated aging, gas corrosion, and humidity tests. The method of making a St. Andrew's cross scratch on the test sample is a well-known method for preparing short-term and test samples, so as to check the protective effect of the coating on the corrosion of the underlying substrate.

[0003] The existing Erichsen 426 scratch pen has a spherical tungsten scratch needle with a diameter of 0.5 mm (0.020") firmly installed on an alumina pen-shaped handle. Since there is no protection mechanism for the scratch needle after use, the tip of the scratch needle is easily damaged by impact. In order to protect the scratch needle while facilitating the operation of the scratch pen during work, we propose a scratch tool for corrosion test which is convenient to operate to solve the above problems. Summary of the Utility Model

[0004] 1. Technical Problems to be Solved

[0005] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a scratch tool for corrosion test which is convenient to operate. After use, it can make the lever withdraw from the top end of the chute, so as to push the connecting end and the scratch needle into the inside of the pen shaft by the elastic force of the spring, which plays a good protective role for the scratch needle and is convenient for the operation of the scratch pen during work.

[0006] 2. Technical Solutions

[0007] To solve the above problems, the utility model adopts the following technical solutions.

[0008] A scratch tool for corrosion test which is convenient to operate includes a pen shaft and a scratch needle installed at the bottom end of the pen shaft. A cylindrical cavity is arranged inside the pen shaft. A chute communicated with the cavity is opened on the side wall of the pen shaft, and a bent part bent upward is arranged at the bottom end of the chute. Guide holes are symmetrically opened below the chute;

[0009] A circular connecting head is movably connected inside the cavity. A top rod is fixedly connected to the center position of the lower surface of the connecting head. A lever slidably connected with the chute is fixedly connected to the side wall of the connecting head, and the lever extends to the outside of the pen shaft;

[0010] A circularly structured boss is movably connected below the connector head, and the boss is rotatably connected to the bottom end of the ejector rod. A guiding stud that is slidably connected to the guiding hole is installed on the side wall of the boss, and a connecting handle that is cylindrically structured is integrally formed on the lower surface of the boss;

[0011] A spring is sleeved outside the connecting handle.

[0012] Furthermore, a threaded hole is provided at the bottom end of the connecting handle;

[0013] A stud is screwed inside the threaded hole. The end of the stud is fixedly connected to a connecting end head, and the connecting end head is fixedly connected to the scratch needle.

[0014] Furthermore, a ring-shaped limiting part is installed at the bottom opening of the cavity, and the inner diameter of the limiting part is adapted to the outer diameter of the connecting handle.

[0015] Furthermore, one end of the spring abuts against the limiting part, and the other end of the spring abuts against the boss.

[0016] Furthermore, a bearing that is interference-connected to the bottom end of the ejector rod is installed on the surface of the boss.

[0017] Furthermore, the outer diameter of the boss is adapted to the inner diameter of the cavity, and the guiding stud and the guiding hole are in clearance fit.

[0018] Furthermore, the scratch needle is made of tungsten metal.

[0019] 3. Advantageous Effects

[0020] Compared with the prior art, the advantages of the present utility model are as follows:

[0021] (1) In this solution, by manually using the lever to cooperate with the sliding groove to press down the connector head, during the process of the bottom end of the ejector rod rotating in cooperation with the boss, the guiding stud cooperates with the guiding hole to move downward, so as to eject the connecting end head and the scratch needle from the cavity provided inside the pen barrel. At the same time, the spring is compressed and deformed. Finally, the lever reaches the bent part at the bottom end of the sliding groove to limit the connector head. After use, the lever is withdrawn from the top end of the sliding groove, so as to use the elastic force of the spring to push the connecting end head and the scratch needle into the inside of the pen barrel, which plays a good protective role for the scratch needle and is convenient for the operation of the scratch pen during the working process.

[0022] (2) In this solution, by manually holding the connecting end head and screwing it, the stud is disengaged from the threaded hole provided at the bottom end of the connecting handle, so as to facilitate the replacement of the damaged scratch needle, without replacing the whole scratch device, saving materials and reducing the use cost. Description of the Drawings

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0024] Figure 2 is a disassembled schematic diagram of the present utility model;

[0025] Figure 3 is a side view schematic diagram of the pen barrel of the present utility model;

[0026] Figure 4 is a sectional view schematic diagram of part A-A of the pen barrel of the present utility model.

[0027] Explanation of reference numerals in the figure:

[0028] 1. Pen barrel; 2. Scratching needle; 3. Connector; 4. Thumb rod; 5. Lever; 6. Slide groove; 7. Boss; 8. Guide stud; 9. Connecting handle; 10. Screw hole; 11. Spring; 12. Connecting end; 13. Stud; 14. Guide hole. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment:

[0031] Please refer to Figures 1-4 , a scratching device for corrosion test that is easy to operate, including a pen barrel 1 and a scratching needle 2 installed at the bottom end of the pen barrel 1. A cavity in a cylindrical structure is provided inside the pen barrel 1. A slide groove 6 communicating with the cavity is opened on the side wall of the pen barrel 1, and a bent portion that bends upward is provided at the bottom end of the slide groove 6. Guide holes 14 are symmetrically opened below the slide groove 6;

[0032] A connector 3 in a circular structure is movably connected inside the cavity. A thumb rod 4 is fixedly connected to the center position of the lower surface of the connector 3. A lever 5 that is slidably connected to the slide groove 6 is fixedly connected to the side wall of the connector 3, and the lever 5 extends to the outside of the pen barrel 1;

[0033] A boss 7 in a circular structure is movably connected below the connector 3, and the boss 7 is rotatably connected to the bottom end of the thumb rod 4. A guide stud 8 that is slidably connected to the guide hole 14 is installed on the side wall of the boss 7. A connecting handle 9 in a cylindrical structure is integrally formed on the lower surface of the boss 7;

[0034] A spring 11 is sleeved outside the connecting handle 9;

[0035] It should be noted that when the convenient-to-operate scratch tool for corrosion test is in use, the connecting head 3 is pressed down manually by using the lever 5 in cooperation with the sliding groove 6. During the process of the bottom end of the ejector rod 4 rotating in cooperation with the boss 7, the guiding column head 8 moves downward in cooperation with the guiding hole 14, so as to eject the connecting end 12 and the scratch needle 2 from the cavity arranged inside the pen barrel 1. At the same time, the spring 11 is compressed and deformed. Finally, the lever 5 comes to the bent part at the bottom end of the sliding groove 6 to limit the connecting head 3, so that the scratch needle 2 can perform a corrosion test on the surface of the workpiece. After use, the lever 5 is withdrawn from the top end of the sliding groove 6, so as to push the connecting end 12 and the scratch needle 2 into the inside of the pen barrel 1 by the elastic force of the spring 11, which plays a good role in protecting the scratch needle 2 and is convenient for the operation of the scratch pen during the working process.

[0036] As Figure 2 shown, a threaded hole 10 is formed at the bottom end of the connecting handle 9;

[0037] A stud 13 is screwed inside the threaded hole 10. The end of the stud 13 is fixedly connected with a connecting end 12, and the connecting end 12 is fixedly connected with the scratch needle 2;

[0038] The scratch needle 2 is made of tungsten metal;

[0039] It should be noted that by manually holding the connecting end 12 and screwing it, the stud 13 is disengaged from the threaded hole 10 arranged at the bottom end of the connecting handle 9, so as to facilitate the replacement of the damaged scratch needle 2 without replacing the whole scratch tool, saving materials and reducing the use cost.

[0040] As Figure 2 、 Figure 4 shown, a limiting part arranged in a ring structure is installed at the bottom opening of the cavity, and the inner diameter of the limiting part is adapted to the outer diameter of the connecting handle 9. One end of the spring 11 abuts against the limiting part, and the other end of the spring 11 abuts against the boss 7;

[0041] It should be noted that the connecting handle 9 is limited by the limiting part in cooperation with the boss 7, and at the same time, the free expansion and contraction of the scratch needle 2 can be realized by using the spring 11.

[0042] As Figure 4 shown, a bearing that is interference-connected with the bottom end of the ejector rod 4 is installed on the surface of the boss 7;

[0043] It should be noted that the ejector rod 4 rotates self by cooperating with the bearing installed on the surface of the boss 7, so as to realize the expansion and contraction of the scratch needle 2.

[0044] As Figure 2 shown, the outer diameter of the boss 7 is adapted to the inner diameter of the cavity, and the guiding column head 8 is in clearance fit with the guiding hole 14;

[0045] It should be noted that the stability of the connecting end 12 after extension is ensured, thus ensuring the stability of the scratch needle 2 during the working process.

[0046] When in use: manually press down the connector 3 by using the lever 5 in cooperation with the sliding groove 6. During the process of the bottom end of the ejector rod 4 rotating in cooperation with the boss 7, the guiding head 8 moves downward in cooperation with the guiding hole 14, thereby ejecting the connecting end 12 and the scratch needle 2 from the cavity provided inside the pen barrel 1, and at the same time compressing and deforming the spring 11. Finally, the lever 5 reaches the bent part at the bottom end of the sliding groove 6 to limit the connector 3, so that the scratch needle 2 can perform a corrosion test on the surface of the workpiece. After use, the lever 5 is withdrawn from the top end of the sliding groove 6, so as to push the connecting end 12 and the scratch needle 2 into the inside of the pen barrel 1 by the elastic force of the spring 11.

[0047] The above is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A scratch tool for corrosion test that is easy to operate, comprising a pen rod (1) and a scratch needle (2) installed at the bottom end of the pen rod (1), characterized in that: A cavity in a cylindrical structure is provided inside the pen barrel (1). A chute (6) communicating with the cavity is formed in the side wall of the pen barrel (1), and a bent portion bent upward is provided at the bottom end of the chute (6). Guide holes (14) are symmetrically formed below the chute (6). A connector head (3) in a circular structure is movably connected inside the cavity. A push rod (4) is fixedly connected to the center position of the lower surface of the connector head (3). A shift lever (5) slidably connected to the chute (6) is fixedly connected to the side wall of the connector head (3), and the shift lever (5) extends to the outside of the pen barrel (1). A boss (7) in a circular structure is movably connected below the connector head (3), and the boss (7) is rotatably connected to the bottom end of the push rod (4). A guide stud head (8) slidably connected to the guide hole (14) is installed on the side wall of the boss (7). A connecting handle (9) in a cylindrical structure is integrally formed on the lower surface of the boss (7). A spring (11) is sleeved outside the connecting handle (9).

2. The scratch tool for corrosion test that is easy to operate according to claim 1, wherein: A threaded hole (10) is formed at the bottom end of the connecting handle (9). A stud (13) is screwed inside the threaded hole (10). A connecting end (12) is fixedly connected to the end of the stud (13), and the connecting end (12) is fixedly connected to the scratch needle (2).

3. A scratch tool for corrosion testing that is easy to operate according to claim 1, characterized in that: A limiting portion in a ring structure is installed at the bottom opening of the cavity, and the inner diameter of the limiting portion is adapted to the outer diameter of the connecting handle (9).

4. The scratch tool for corrosion test that is easy to operate according to claim 3, wherein: One end of the spring (11) abuts against the limiting portion, and the other end of the spring (11) abuts against the boss (7).

5. A scratch tool for corrosion test that is easy to operate according to claim 1, characterized in that: A bearing in interference fit with the bottom end of the push rod (4) is installed on the surface of the boss (7).

6. The scratch tool for corrosion test that is convenient to operate according to claim 1, wherein: The outer diameter of the boss (7) is adapted to the inner diameter of the cavity, and the guide stud head (8) is in clearance fit with the guide hole (14).

7. A scratch tool for corrosion test that is easy to operate according to claim 1, characterized in that: The scratch needle (2) is made of tungsten metal.

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