Screwdriver bending resistance testing device

Abstract

The utility model relates to the technical field of mechanical property testing, in particular to a bending resistance testing device for a screwdriver. The device comprises a beam, and a first stroke groove is formed in the upper end face of the beam and extends towards one end of the beam in the length direction. The supporting piece is located in the first stroke groove and slidably connected with the first stroke groove, the supporting piece is hinged to the cross beam in a crossed mode, one end of the supporting piece in the length direction is located in the first stroke groove, and the other end of the supporting piece extends out of the first stroke groove; the counter weight is loaded on one end, opposite to the supporting piece, of the cross beam; the stop piece is connected with the cross beam and located between the supporting piece and the balance weight, the stop piece is provided with a stop part facing the supporting piece, and the stop part is located above the cross beam. According to the utility model, the distance between the support member and the stop member is flexible and adjustable, so that the device can adapt to screwdrivers with different lengths when in use, is high in universality, not only is easy to test the bending resistance of screwdrivers with different specifications, but also can obtain the specific bending moment data of the tested screwdrivers.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mechanical property test, especially a screwdriver bending resistance testing device. BACKGROUND

[0002] Screwdriver is a special tool for installing and disassembling screw, and common screwdrivers include manual screwdriver and electric screwdriver. Screwdriver will frequently bear torsion and bending force in daily use, for example, when the screw is installed in an inclined position, the screwdriver will bear bending force in addition to torsion because the direction of force is not consistent with the axis of the screw during screwing.

[0003] In order to ensure the quality of screwdriver products and avoid the problem of easy damage due to insufficient bending resistance in the use process, the screwdriver will generally be subjected to bending test before leaving the factory. However, there is no uniform standard for testing the bending resistance of screwdrivers in China at present, so the devices and methods for testing the bending resistance of screwdrivers are not uniform. In actual testing, the size and shape of the screwdriver handle have various specifications, which limits the universality of some screwdriver testing devices. SUMMARY

[0004] In order to improve the problem of insufficient universality of the screwdriver testing device at present, the purpose of the utility model is to provide a screwdriver bending resistance testing device suitable for testing the bending resistance of various specifications of screwdrivers.

[0005] In order to achieve the purpose of the utility model, the screwdriver bending resistance testing device provided by the utility model adopts the following technical scheme:

[0006] A screwdriver bending resistance testing device comprises:

[0007] A crossbeam, a first stroke slot is formed in the upper end surface of the crossbeam, and the first stroke slot extends to one end of the length direction of the crossbeam;

[0008] A support piece, the support piece is located in the first stroke slot and is in sliding connection with the first stroke slot, the support piece is cross-hinged with the crossbeam, one end of the length direction of the support piece is located in the first stroke slot, and the other end of the support piece extends out of the first stroke slot;

[0009] A counterweight, the counterweight is loaded on the end of the crossbeam opposite to the support piece;

[0010] A stop piece, the stop piece is connected with the crossbeam and is located between the support piece and the counterweight, the stop piece is provided with a stop part towards the support piece, and the stop part is located above the crossbeam.

[0011] By adopting the technical scheme, during testing, the shank of the measured screwdriver is erected on the support, the upper end face of the tip abuts against the lower end face of the stop portion of the stopper, a counterweight of a certain weight is applied to the end of the cross beam away from the support, and a vertically downward force is applied to the shank, so that the tip lifts the stopper to drive the cross beam and the counterweight to rise until the shank of the screwdriver is in a horizontal position, at this time, whether the screwdriver will appear assembly rupture, shank and tip permanent deformation, and handle loosening is observed, if there is no above-mentioned situation, the test is passed. The device uses the lever principle to test the bending resistance of the screwdriver, the mass of the counterweight can be adjusted according to the model and material of the measured screwdriver, in general, when the total bending load borne by the screwdriver reaches the minimum bending moment specified for the screwdriver, if the screwdriver does not appear the above-mentioned situation, the test is passed.

[0012] In the above technical scheme, according to different lengths of the measured screwdriver, the support can slide along the first stroke slot to adjust the distance between the support and the stopper, so that the screwdrivers of different lengths can be easily erected with the shank on the support and the tip abutting against the stopper.

[0013] Implementations can include any or all of the following features.

[0014] In some embodiments, a second stroke slot is opened on the side surface of the cross beam, and the second stroke slot and the first stroke slot are parallel; a shaft is fixed on the side surface of the support and is slidingly connected in the second stroke slot.

[0015] Through the above technical scheme, the cooperation of the second stroke slot and the shaft plays a guiding role in the movement path of the support, and the articulation of the support and the cross beam is easily realized.

[0016] In some embodiments, the second stroke slot is a through slot, one end of the shaft penetrates out of the second stroke slot; and the screwdriver bending resistance testing device further comprises a limiting piece, which is sleeved on the shaft and rotationally connected with the shaft.

[0017] Through the above technical scheme, the shaft penetrates out of the second stroke slot for connection with the limiting piece, when the support is moved to a suitable test position, the limiting piece can be used to limit the shaft, so as to position the support at the required test position, so that the support does not move during subsequent force application, ensuring the stability of the testing device and the accuracy of the test results of screwdrivers in different batches. In some embodiments, the limiting piece can be a nut, and the shaft can be provided with external threads, the nut can be tightened to position the support, but since the cross beam and the support need to rotate through the articulation shaft during testing, the positioning effect of the nut on the shaft is limited. As a relatively optimal embodiment for positioning the support, the present application will adopt the following technical scheme.

[0018] In some embodiments, the limiting member is plate-shaped and is connected to the outside of the second travel groove. The side wall of the crossbeam has a row of holes along the length of the second travel groove, and the limiting member is screwed to the row of holes by a first bolt.

[0019] Through the above technical solution, the limiting component can position the support component at the location of any row of holes. This limiting method can not only provide a firm and stable positioning effect for the support component, but also will not interfere with the free rotation of the support component at the hinge joint with the crossbeam shaft.

[0020] In some embodiments, the limiting member has a first positioning groove that extends along the arrangement direction of the holes, and the first bolt passes through the first positioning groove and is screwed into the holes.

[0021] Through the above technical solution, the first positioning groove on the limiting component provides more installation positions for the first bolt, making the positioning of the support component more flexible. For example, it can allow the user to position the support component to the required position more quickly, and it can also increase the number of the first bolts to improve the positioning stability of the support component.

[0022] In some embodiments, the stop portion has a stepped surface that extends in a direction close to the crossbeam.

[0023] In the above technical solution, when the position of the support is fixed, the different steps of the stop part with the stepped surface are at different distances from the support. When the required measurement position of the screwdriver cannot be achieved by adjusting the position of the support, compensation can be made by selecting different steps of the stop part to adjust the position of the support, which further improves the versatility of the device of this application.

[0024] In some embodiments, the stop member is sleeved on the crossbeam, and the side of the stop member that is connected to the crossbeam has a second positioning groove. The second positioning groove extends along the arrangement direction of the holes, and a second bolt passes through the second positioning groove and is screwed to the holes.

[0025] The above technical solution makes the position of the stop component on the crossbeam adjustable, further facilitating users to adjust the testing device to the required measurement position.

[0026] In some embodiments, a third stroke groove is provided at one end of the crossbeam opposite to the first stroke groove. The third stroke groove extends along the length of the crossbeam, and a counterweight seat is slidably connected in the third stroke groove for connecting with the counterweight.

[0027] Through the above technical solution, the design of the third stroke groove and the counterweight seat makes the counterweight position of this application adjustable. On the one hand, it allows users to perform bending performance tests on the same screwdriver under different load arms and obtain the maximum and minimum bending moment data of the screwdriver. On the other hand, it is easy to determine the appropriate measuring torque for screwdrivers of different specifications by matching different counterweight masses.

[0028] In some embodiments, the first travel groove is a through groove, and the bottom end of the support extends through the first travel groove and is fixedly connected to a base.

[0029] The above technical solution makes it easy to place the support on a horizontal platform, thus improving the stability of the device.

[0030] In some embodiments, the end of the support extending from the first travel groove gradually converges into a straight line in a direction away from the crossbeam.

[0031] The above technical solution enables the screwdriver under test and the support to form point contact, reducing frictional loss between the support and the screwdriver shank, and facilitating flexible rotation of the screwdriver under test during testing.

[0032] In summary, this utility model provides a screwdriver bending resistance testing device, which has the following beneficial effects:

[0033] First, the support and stop components of the device in this application have a relatively wide range of adjustment. At the same time, through the design of the limiting component, the second positioning groove, and the second bolt, the positions of the support and stop components are firmly and stably positioned without interfering with the free rotation of the hinge between the support and the crossbeam shaft. This allows the device to adapt to screwdrivers of different lengths during use, making it highly versatile. It is not only easy to test the bending resistance of screwdrivers of different specifications, but also to obtain the specific bending moment data of the screwdriver being tested.

[0034] Secondly, this application, through the design of the third stroke groove and the counterweight seat, makes the counterweight position flexible and adjustable. On the one hand, it allows users to perform bending performance tests on the same screwdriver under different load arms and obtain the maximum bending moment of the screwdriver. On the other hand, it is easy to determine the appropriate measuring torque for screwdrivers of different specifications by matching different counterweight masses. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the test device of this application;

[0036] Figure 2 This is a schematic diagram of the exploded structure of the test device in this application;

[0037] Figure 3 This is a schematic diagram of the test device in the test state of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Crossbeam; 11. First stroke groove; 12. Second stroke groove; 13. Third stroke groove; 14. Positioning hole;

[0040] 2. Support component; 21. Base; 22. Shaft; 23. Straight line;

[0041] 3. Stop component; 31. Second positioning groove; 32. Second bolt; 33. Stop part; 331. Step surface;

[0042] 4. Limiting component; 41. Mounting hole; 42. First positioning groove; 43. First bolt;

[0043] 5. Counterweight; 51. Counterweight base; 511. Connecting groove; 52. Counterweight block;

[0044] 6. The screwdriver being tested; 61. The shaft; 62. The tip; 63. The handle. Detailed Implementation

[0045] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, back, bottom, and top, are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model.

[0046] This utility model discloses a screwdriver bending resistance testing device, hereinafter referred to as the testing device. (Refer to...) Figure 1 It includes a crossbeam 1, on which a support member 2, a stop member 3 and a counterweight 5 are arranged sequentially along the length of the crossbeam 1.

[0047] Specifically, refer to Figure 1 A first travel groove 11 is formed on the upper end face of the crossbeam 1. The first travel groove 11 is located at one end of the crossbeam 1 along its length and is a through groove that extends through the height of the crossbeam 1. The first travel groove 11 extends along the length of the crossbeam 1 to the other end of the crossbeam 1. A second travel groove 12 is formed on each side of the crossbeam 1 located on the surface of the first travel groove 11. The second travel groove 12 is located below the first travel groove 11 and is arranged parallel to the first travel groove 11.

[0048] Reference Figure 1 The support member 2 is installed in the first stroke groove 11. The upper end of the support member 2 extends from the upper port of the first stroke groove 11 to support the screwdriver 6 being tested. The lower end of the support member 2 extends from the lower port of the first stroke groove 11 and is fixedly mounted with the base 21. Shafts 22 are fixed at corresponding positions on the two sides of the support member 2 facing the second stroke groove 12. The diameter of the shafts 22 is equal to or slightly smaller than the width of the second stroke groove 12, so that the shafts 22 can pass through the second stroke groove 12. The crossbeam 1 is hinged to the support member 2 through the shafts 22. Furthermore, the end of the support member 2 extending out of the first stroke groove 11 gradually converges into a straight line 23 in the direction away from the crossbeam 1. The straight line 23 is parallel to the central axis 22 of the shaft 22, so that the shank 61 of the screwdriver 6 under test can form a contact point with the support member 2 during the test, so that the screw can rotate with the contact point as the fulcrum. Thus, the bending performance of the screwdriver 6 under test can be tested using the lever principle, and a series of data such as the minimum torque and maximum torque of the screwdriver 6 under test can be calculated based on the lever arm and the load of the screwdriver 6 under test.

[0049] Furthermore, referring to Figure 1 and Figure 2 The system also includes limiting members 4, which are located on the two sides of the crossbeam 1 where the second stroke groove 12 is provided, and the support member 2 is located between the two limiting members 4. The limiting member 4 is plate-shaped, with a mounting hole 41 in the middle. The mounting hole 41 is a through hole, and its diameter is equal to or slightly smaller than the diameter of the shaft 22 of the support member 2. The mounting hole 41 is used for the shaft 22 of the support member 2 to pass through and rotate, ensuring that the crossbeam 1 and the support member 2 can rotate relative to each other through the shaft 22 during measurement, and facilitating the assembly and disassembly of the limiting member 4. The limiting member 4 also has a first positioning groove 42, which is located around the mounting hole 41 and is a through groove. Multiple positioning holes 14 are provided on the side wall of the crossbeam 1 at positions corresponding to the first positioning groove 42. The multiple positioning holes 14 form a row of holes, and the extension direction of the row of holes is parallel to the first positioning groove 42. In a preferred embodiment, the row of holes and the first positioning groove 42 extend along the length direction of the crossbeam 1 to the other end of the crossbeam 1. The number of first positioning grooves 42 and the number of rows of holes can be, but are not limited to, the following embodiments: the first positioning grooves 42 are provided on both the upper and lower sides of the mounting hole 41 on the limiting member 4, and the row of holes are provided on both the upper and lower sides of the second stroke groove 12 on the crossbeam 1.

[0050] Reference Figure 1 and Figure 2The shaft 22 passes through the mounting hole 41 of the limiting member 4, so that the inner sidewall of the limiting member 4 abuts against the outer sidewall of the crossbeam 1, and the first positioning groove 42 is located outside the row hole and aligned with the row hole. On one side of the crossbeam 1, a first bolt 43 is inserted into the first positioning groove 42 and one of the positioning holes 14 in the row hole. One end of the first bolt 43 abuts against the outside of the first positioning groove 42 on that side, and the other end passes through the first stroke groove 11 and then successively passes through the row hole and the first positioning groove 42 on the other side of the crossbeam 1, and is fixed with a nut on the other side of the crossbeam 1. When the support member 2 moves to the appropriate position of the crossbeam 1, the position of the support member 2 is fixed on the crossbeam 1 by the limiting member 4, thereby improving the stability of the test device.

[0051] Furthermore, referring to Figure 2 The lower end of the stop member 3 is fitted onto the crossbeam 1. Second positioning grooves 31 are formed on the two sides of the lower end of the stop member 3 that connect to the crossbeam 1. These second positioning grooves 31 are through grooves and parallel to the drain holes. A second bolt 32 passes through the second positioning groove 31. One end of the second bolt 32 abuts against the outside of one side of the second positioning groove 31, while the other end passes through the drain hole and the first stroke groove 11, exiting the crossbeam 1. A nut is then used to fix the stop member 3 to the crossbeam 1 outside the second positioning groove 31 on the other side of the stop member 3. This connection method allows the position of the stop member 3 on the crossbeam 1 to be adjustable, and once the stop member 3 is in the appropriate position, its position is fixed by the second positioning groove 31 and the second bolt 32. The upper end of the stop member 3 is located above the crossbeam 1. A stop portion 33 is provided on the side of the upper end of the stop member 3 facing the crossbeam 1, for abutting against the tip 62 of the screwdriver to be tested. The stop portion 33 has at least two stepped surfaces 331, which extend downward along the direction close to the crossbeam 1, so that the stop member 3 has multiple stop portions 33 at different positions from the support member 2.

[0052] Furthermore, referring to Figure 2 A third stroke groove 13 is provided at one end of the crossbeam 1 opposite to the first stroke groove 11, and the third stroke groove 13 extends along the length of the crossbeam 1. The counterweight 5 includes a counterweight base 51 and a counterweight block 52 (see...). Figure 3 The counterweight base 51 is slidably connected within the third stroke groove 13, and is used to connect with the counterweight block 52. As an example, a connecting groove 511 can be provided on the counterweight base 51, and the counterweight block 52 can be hung downwards within the connecting groove 511. Further, as a preferred embodiment, the gap between the third stroke groove 13 and the sliding connection portion of the counterweight base 51 can be controlled relatively low, increasing the resistance when the counterweight base 51 slides within the third stroke groove 13. Thus, when the counterweight base 51 is connected to the counterweight block 52, it is less likely to slide freely within the third stroke groove 13, and the counterweight 5 is less likely to shift when the crossbeam 1 and the support member 2 rotate relative to each other during the measurement of the screwdriver 6.

[0053] The implementation principle of the screwdriver bending resistance testing device in this embodiment of the utility model is as follows:

[0054] like Figure 3 As shown, according to the length of the screwdriver 6 being tested, the support 2 and the stop 3 are adjusted to suitable positions and fixed, so that the tip 62 of the screwdriver 6 abuts against the stop portion 33 of the stop 3, and half of the shank 61 abuts against the top of the support 2, with the handle 63 suspended in the air. During measurement, a counterweight 52 of a certain mass is connected to the counterweight base 51 according to the measurement requirements, and a vertically downward force is applied to the handle 63 of the screwdriver 6 being tested, so that the tip 62 of the screwdriver lifts the stop 3, causing the crossbeam 1 and the counterweight 52 to rise. Observe whether the screwdriver will break under load, whether the shank 61 and tip 62 will be permanently deformed, or whether the handle 63 will become loose. If none of the above occurs, the test is passed.

[0055] When the screwdriver 6 being tested is placed on the testing device, if the tip 62 of the screwdriver cannot abut against the stop part 33, or if half of the shank 61 cannot abut against the top of the support member 2, it is necessary to remove the first bolt 43 and the second bolt 32, adjust the relative positions of the limiting member 4 and the stop part 3 on the crossbeam 1, and after the positions are appropriate, install the limiting member 4, the first bolt 43, and the second bolt 32 to fix the test positions of the support member 2 and the stop part 3, and then carry out subsequent tests.

[0056] Of course, the above embodiments are the preferred embodiments of this utility model, and are only used to illustrate the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be included within the protection scope of this utility model.

Claims

1. A screwdriver bending resistance testing device, characterized in that, include: A crossbeam, wherein a first travel groove is formed on the upper end face of the crossbeam, and the first travel groove extends to one end of the crossbeam along its length. A support member is located within and slidably connected to the first stroke groove. The support member is cross-hinged with the crossbeam. One end of the support member in the length direction is located within the first stroke groove, and the other end extends out of the first stroke groove. counterweight The load is on the end of the crossbeam opposite to the support member; A stop member, connected to the crossbeam, is located between the support member and the counterweight. The stop member has a stop portion facing the support member, and the stop portion is located above the crossbeam.

2. The screwdriver bending resistance testing device as described in claim 1, characterized in that, A second travel groove is formed on the side of the crossbeam, and the second travel groove is parallel to the first travel groove; a shaft is fixed to the side of the support member, and the shaft is slidably connected in the second travel groove.

3. The screwdriver bending resistance testing device as described in claim 2, characterized in that, The second stroke groove is a through groove, and one end of the shaft passes through the second stroke groove; the screwdriver bending resistance testing device also includes a limiting member, which is sleeved on the shaft and rotatably connected to the shaft.

4. The screwdriver bending resistance testing device as described in claim 3, characterized in that, The limiting member is plate-shaped and is connected to the outside of the second stroke groove. The side wall of the crossbeam has a row of holes along the length of the second stroke groove, and the limiting member is screwed to the row of holes by a first bolt.

5. The screwdriver bending resistance testing device as described in claim 4, characterized in that, The limiting member has a first positioning groove, which extends along the arrangement direction of the holes. The first bolt passes through the first positioning groove and is screwed into the holes.

6. The screwdriver bending resistance testing device as described in claim 1, characterized in that, The stop portion has a stepped surface that extends in a direction close to the crossbeam.

7. The screwdriver bending resistance testing device as described in claim 5, characterized in that, The stop member is sleeved on the crossbeam. The side of the stop member that is connected to the crossbeam has a second positioning groove. The second positioning groove extends along the arrangement direction of the holes. A second bolt passes through the second positioning groove and is screwed to the holes.

8. The screwdriver bending resistance testing device as described in claim 1, characterized in that, A third stroke groove is provided at one end of the crossbeam opposite to the first stroke groove. The third stroke groove extends along the length of the crossbeam, and a counterweight seat is slidably connected in the third stroke groove. The counterweight seat is used to connect with the counterweight.

9. The screwdriver bending resistance testing device as described in claim 1, characterized in that, The first travel groove is a through groove, and the bottom end of the support extends through the first travel groove and is fixedly connected to the base.

10. The screwdriver bending resistance testing device as described in claim 1, characterized in that, The end of the support extending from the first travel groove gradually converges into a straight line in a direction away from the crossbeam.

Images