Gear single tooth tensile strength medium and high speed test device

Abstract

The present invention provides a medium- and high-speed testing device for the tensile strength of a single tooth of a gear, comprising an upper fixed block, a pre-sliding mechanism, a testing mechanism and a lower fixed block, wherein the testing mechanism is arranged between the upper fixed block and the lower fixed block, and the pre-sliding mechanism is arranged between the testing mechanism and the upper fixed block or the lower fixed block, and the pre-sliding mechanism can cause relative movement along the axis of the testing machine between the upper fixed block and the pre-sliding mechanism or between the lower fixed block and the pre-sliding mechanism, and the maximum displacement of the relative movement enables the testing mechanism to reach the stretching speed of the high-speed tensile test. The pre-sliding mechanism can cause relative displacement between the testing mechanism and the upper and lower fixed blocks, and during the high-speed tensile test, the force-bearing end of the testing mechanism can be accelerated first through this relative displacement to meet the stretching speed, thereby solving the problem that the displacement of the original mechanism is too large before the stretching speed is reached, thereby breaking the teeth of the gear to be tested.

Description

Technical Field

[0001] The invention relates to the technical field of gear testing, and in particular to a medium- and high-speed testing device for the tensile strength of a single gear tooth. Background Art

[0002] Gears are widely used as mechanical transmission components, mainly using the teeth on the rim to transmit motion and power. Therefore, different fields have different requirements for the tensile strength of single teeth of gears. Therefore, the tensile strength of single teeth is an important parameter of gears and needs to be tested to ensure the performance of gears. When the linear speed of the gear at the pitch circle reaches more than 0.1m / s in actual working conditions, it is necessary to perform medium-high speed tensile tests on the single teeth of the gear. In medium-high speed tests, the tensile speed of the testing machine must reach more than 0.1m / s. Before reaching the corresponding tensile speed, the test pull head needs to have an acceleration process. The existing test devices, such as the test devices disclosed in the utility model patents with publication numbers CN209961597 and CN209656444, have fixed connections for the test pull heads. In the acceleration process to reach the required tensile speed, the gear teeth or the test teeth on the pull head may be directly broken due to excessive displacement, which cannot meet the acceleration needs and can only be applied to low-speed tests, but not to high-speed tests. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a medium- and high-speed testing device for the tensile strength of a single tooth of a gear.

[0004] The technical solution to be adopted by the present invention to solve its technical problem is: a medium- and high-speed testing device for the tensile strength of a single tooth of a gear, comprising an upper fixed block, a pre-sliding mechanism, a testing mechanism and a lower fixed block, wherein the upper fixed block and the lower fixed block are arranged relative to each other and are respectively used to be clamped on the upper and lower chucks of a testing machine, the testing mechanism is arranged between the upper fixed block and the lower fixed block, and the pre-sliding mechanism is arranged between the testing mechanism and the upper fixed block or the lower fixed block, and the pre-sliding mechanism can cause a relative movement between the upper fixed block and the pre-sliding mechanism or between the lower fixed block and the pre-sliding mechanism along the axis of the testing machine, and the maximum displacement of the relative movement enables the testing mechanism to reach the stretching speed of the high-speed tensile test. By adding a pre-sliding mechanism between the testing mechanism and the upper fixed block or the lower fixed block, a relative displacement can be generated between the testing mechanism and the upper and lower fixed blocks. During the high-speed tensile test, the force-bearing end of the testing mechanism can be accelerated first through this relative displacement to meet the stretching speed, thereby solving the problem that the displacement of the original mechanism is too large before the stretching speed is reached, thereby breaking the teeth of the gear to be tested. The position of the pre-sliding mechanism can be set above the test mechanism or below the test mechanism, taking into account the specific situation of the test machine and the test requirements.

[0005] Furthermore, in order to reduce the measurement error, the test mechanism includes a pull plate, a pull head and a gear profiling tool. One end of the pull head is connected to the pull plate, and the other end of the pull head extends outward. The inner side of the extended end is provided with a detection tooth for testing. The gear profiling tool is provided with a mounting groove for mounting the gear to be tested on the side opposite to the detection tooth. The central angle corresponding to the opening of the mounting groove is less than 180°, which is convenient for rapid disassembly and assembly. The contact point between the detection tooth of the pull head and the single tooth of the gear to be tested is located on the central axis of the testing machine to avoid eccentric loading. The gear profiling tool is manufactured to ensure the consistency of the position of the single tooth of the gear to be tested and improve the accuracy of repeated positioning.

[0006] Furthermore, in order to ensure that the movement and force directions are parallel to the central axis of the testing machine, the testing mechanism also includes a guide rod, one end of which is connected to the pull plate, and the other end is connected to the upper fixed block or the lower fixed block, and one end of the guide rod is movably connected to the pull plate and the upper fixed block or the lower fixed block, and the other end is fixedly connected.

[0007] Further, the pre-sliding mechanism includes a pre-sliding rod and a stopper, wherein one end of the pre-sliding rod is connected to the upper fixed block or the lower fixed block, and the other end is connected to the pull plate, and at least one end between the pre-sliding rod and the upper fixed block or the lower fixed block and between the pre-sliding rod and the pull plate is movably connected, and the stopper is arranged at the end of the pre-sliding rod at the movably connected end, and is used to limit the movement of the upper fixed block and / or the relative displacement between the lower fixed block and the pull plate. The stopper can be adjusted along the axis of the pre-sliding rod at the fixed position of the pre-sliding rod, so as to be suitable for testing at different stretching speeds, and the greater the speed, the longer the distance required to accelerate the pre-sliding.

[0008] Specifically, the pull plate includes a lower connecting portion of the pre-sliding mechanism and a pull head fixing portion. The pull head fixing portion is arranged below the lower connecting portion of the pre-sliding mechanism and is composed of two parallel clamps. The clamps are provided with pin holes that penetrate the clamps horizontally. The lower connecting portion of the pre-sliding mechanism is provided with pull rod mounting holes that match the number and position of the pre-sliding pull rods.

[0009] Specifically, the slider includes a fixing portion and a detection portion, the fixing portion is provided with a pin hole extending transversely therethrough, the detection portion is integrally connected to one side of the fixing portion and extends downward to form an inverted L-shaped structure, and the detection teeth are arranged on the inner side of the detection portion.

[0010] Specifically, the gear profiling tooling includes a fixing part and a gear mounting part, the fixing part is provided with a pin hole extending transversely therethrough, the gear mounting part is integrally connected to one side of the fixing part and extends upward to form an L-shaped structure, and the gear mounting part is provided with a mounting groove for mounting the gear to be tested.

[0011] When the pre-sliding mechanism is arranged between the testing mechanism and the upper fixing block, the structures of the upper fixing block and the lower fixing block are as follows:

[0012] Specifically, the upper fixed block includes a clamping portion on the testing machine and a connecting portion on the pre-sliding mechanism. The clamping portion on the testing machine is integrally connected above the connecting portion on the pre-sliding mechanism to form an inverted T-shaped block structure. The connecting portion on the pre-sliding mechanism is provided with mounting holes on the pull rods that match the number and position of the pre-sliding pull rods.

[0013] Specifically, the lower fixing block includes a lower clamping portion of the testing machine, a profiling tooling fixing portion, and a connecting portion for connecting the lower clamping portion of the testing machine and the profiling tooling fixing portion together. The lower clamping portion of the testing machine is arranged below the connecting portion, and the profiling tooling fixing portion is arranged above the connecting portion, and is composed of two mutually parallel clamping plates, and the clamping plates are provided with pin holes that pass through the clamping plates horizontally.

[0014] Preferably, the upper fixing block, the pre-sliding mechanism, the testing mechanism and the lower fixing block are all made of Unimax die steel with a hardness greater than HRC52.

[0015] The beneficial effects of the present invention are:

[0016] (1) Add a pre-sliding mechanism to reserve acceleration distance, so that single tooth tensile strength test of medium and high speed gears can be carried out;

[0017] (2) Make a gear profiling tool to ensure the consistency of the position of a single tooth of the gear to be tested. The gear profiling tool can be disassembled and replaced, and is suitable for tensile strength testing of various gears;

[0018] (3) The contact point between the pull head and the single tooth of the gear to be tested is designed on the central axis of the testing machine to avoid eccentric loading;

[0019] (4) A guide rod is installed between the pull plate and the fixed block to make the guide positioning more accurate;

[0020] (5) The upper and lower fixing blocks at the installation position are designed as T-shaped blocks, which are better compatible with different models of testing machines;

[0021] (6) Multiple sets of guide rods are installed between the fixed plate and the pulling plate to ensure the guiding accuracy during high-speed pulling;

[0022] (7) Choose square blocks to increase the contact area and transmit force and speed more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the testing device of the present invention.

[0025] Figure 2 It is a side structural schematic diagram of the testing device of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the upper fixed block.

[0027] Figure 4 It is a structural schematic diagram of the lower fixed block.

[0028] Figure 5 It is a structural diagram of the pull plate.

[0029] Figure 6 It is a structural diagram of a slider.

[0030] Figure 7 It is a structural schematic diagram of a gear profiling tooling.

[0031] In the figure: 1-upper fixed block, 1a-upper clamping part of the testing machine, 1b-upper connecting part of the pre-sliding mechanism, 1c-pull rod mounting hole, 2-screw, 3-stopper, 4-pre-sliding pull rod, 5-pull plate, 5a-lower connecting part of the pre-sliding mechanism, 5b-pulling head fixing part, 5c-pull rod mounting hole, 5d-guide hole, 5e-pin hole, 6-locating pin, 7-pulling head, 7a-fixing part, 7b-detecting part, 7c-detecting tooth, 7d-pin hole, 8-gear profiling tooling, 8a-fixing part, 8b-gear mounting part, 8c-mounting groove, 8d-opening, 8e-pin hole, 9-gear to be tested, 10-guide rod, 11-locating pin, 12-lower fixed block, 12a-lower clamping part of the testing machine, 12b-connecting part, 12c-profiling tooling fixing part, 12d-pin hole, 12e-fixing hole. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner only, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0033] In the present invention, the specific structure is described by taking the pre-sliding mechanism disposed between the upper fixing block 1 and the testing mechanism as an example, but the position of the pre-sliding mechanism is not limited to the above-mentioned connection mode.

[0034] like Figure 1 and Figure 2As shown, a medium- and high-speed testing device for the tensile strength of a single tooth of a gear of the present invention comprises an upper fixed block 1, a pre-sliding mechanism, a testing mechanism and a lower fixed block 12. The upper fixed block 1 and the lower fixed block 12 are arranged opposite to each other and are respectively used to be clamped on the upper and lower chucks of the testing machine. In this embodiment, the testing mechanism is arranged above the lower fixed block 12, and the upper part is connected to the upper fixed block 1 through the pre-sliding mechanism. The pre-sliding mechanism can cause relative movement between the upper fixed block 1 and the pre-sliding mechanism or between the lower fixed block 12 and the pre-sliding mechanism along the axis of the testing machine, and the maximum displacement of the relative movement enables the testing mechanism to reach the stretching speed of the high-speed tensile test.

[0035] like Figure 3 As shown, the upper fixed block 1 includes a clamping portion 1a on the testing machine and a connecting portion 1b on the pre-sliding mechanism. The clamping portion 1a on the testing machine is integrally connected above the connecting portion 1b on the pre-sliding mechanism, and the two together form an inverted T-shaped block structure. The connecting portion 1b on the pre-sliding mechanism is provided with a rod mounting hole 1c that matches the number and position of the pre-sliding rod 4.

[0036] like Figure 4 As shown, the lower fixing block 12 includes a lower clamping portion 12a of the testing machine, a profiling tool fixing portion 12c, and a connecting portion 12b for connecting the lower clamping portion 12a of the testing machine and the profiling tool fixing portion 12c together to form a T-shaped structure; the lower clamping portion 12a of the testing machine is arranged below the connecting portion 12b, and the profiling tool fixing portion 12c is arranged above the connecting portion 12b, and is composed of two mutually parallel clamping plates, and the clamping plates are provided with pin holes 12d that pass through the clamping plates horizontally; the connecting portion 12b is also provided with fixing holes 12e that match the number and position of the guide rod 10.

[0037] like Figure 1 and Figure 2 As shown, the upper and lower connecting ends of the pre-sliding mechanism in this embodiment are both movably connected, specifically including a pre-sliding rod 4 and a block 3. The pre-sliding rod 4 is a long cylinder, and the block 3 is a square structure. The upper end of the pre-sliding rod 4 passes through the rod mounting hole 1c and is connected to the upper fixed block 1, and a block 3 is provided at the end, and the block 3 is fixed to the pre-sliding rod 4 by a screw 2; the lower end passes through the rod mounting hole 5c on the pull plate 5, and a block 3 is provided at the end, and the block 3 is fixed to the lower end of the pre-sliding rod 4 by a screw 2.

[0038] The testing mechanism includes a pull plate 5, a pull head 7, a gear profiling tool 8 and a guide rod 10. The upper end of the pull head 7 is connected to the pull plate 5, and the lower end of the pull head 7 extends downward. The inner side of the extended end is provided with a detection tooth 7c for testing. The gear profiling tool 8 is provided with a mounting groove 8c for mounting the gear 9 to be tested on the side opposite to the detection tooth 7c. The contact point between the detection tooth 7c of the pull head 7 and the single tooth of the gear 9 to be tested is located on the central axis of the testing machine to avoid eccentric loading. The gear profiling tool 8 is manufactured to ensure the consistency of the single tooth position of the gear 9 to be tested and improve the repeat positioning accuracy. In this embodiment, there are four guide rods 10, which are respectively arranged at the four corners of the testing device. The upper end of the guide rod 10 passes through the guide hole 5d and is movably connected to the pull plate 5, and the lower end is fixed in the fixing hole 12e of the lower fixing block 12.

[0039] like Figure 5 As shown, the pull plate 5 includes a pre-sliding mechanism lower connecting portion 5a and a pull head fixing portion 5b. The pull head fixing portion 5b is arranged below the pre-sliding mechanism lower connecting portion 5a and is composed of two mutually parallel clamps. The clamps are provided with pin holes 5e that penetrate the clamps transversely. The pre-sliding mechanism lower connecting portion 5a is provided with two pull rod mounting holes 5c that match the pre-sliding pull rod 4, and four guide holes 5d that match the guide rod 10.

[0040] like Figure 6 As shown, the slider 7 includes a fixing portion 7a and a detecting portion 7b, the fixing portion 7a is provided with a pin hole 7d which passes through horizontally, the detecting portion 7b is integrally connected to one side of the fixing portion 7a and extends downward to form an inverted L-shaped structure, and the detecting tooth 7c is arranged on the inner side surface of the detecting portion 7b. During installation, the fixing portion 7a of the slider 7 is clamped between the two clamping plates of the pull plate 5, and the pin hole 7d on the slider 7 is aligned with the pin hole 5e on the pull plate 5, and then the positioning pin 6 is inserted into the pin holes 5e and 7d to fix the slider 7 to the pull plate 5.

[0041] like Figure 7 As shown, the gear profiling tool 8 includes a fixing portion 8a and a gear mounting portion 8b, wherein the fixing portion 8a is provided with a pin hole 8e which runs through horizontally, and the gear mounting portion 8b is integrally connected to one side of the fixing portion 8a and extends upward to form an L-shaped structure, and the gear mounting portion 8b is provided with a mounting groove 8c for mounting the gear 9 to be tested; the central angle corresponding to the opening 8d of the mounting groove 8c is less than 180°, which is convenient for rapid disassembly and assembly. During installation, the fixing portion 8a of the gear profiling tool 8 is clamped between the two clamping plates of the lower fixing block 12, and the pin hole 8e on the gear profiling tool 8 is aligned with the pin hole 12d on the lower fixing block 12, and then the positioning pin 11 is inserted into the pin holes 8e and 12d to fix the gear profiling tool 8 and the lower fixing block 12.

[0042] Working principle:

[0043] In this embodiment, the material of the gear 9 to be tested is determined according to the actual test parts, and the remaining upper fixing block 1, pre-sliding mechanism, testing mechanism and lower fixing block 12 are all made of Unimax mold steel (hardness>HRC 52) to ensure rigidity.

[0044] The lower fixed block 12 is connected to the gear 9 to be tested through the positioning pin 11; the pull plate 5 is connected to the pull head 7 through the positioning pin 6. Insert the four guide rods 10 into the lower fixed block 12 and the pull plate 5 to ensure the assembly accuracy. After the pre-sliding pull rod 4 passes through the pull plate 5 and the upper fixed block 1, install the stopper 3 and lock it with the screw 2 to ensure the assembly accuracy. Clamp the upper fixed block 1 and the lower fixed block 12 in the upper and lower chucks of the testing machine respectively. After preparation, start the testing machine and perform medium-to-high speed tensile test at a tensile speed of 0.1m / s-10m / s until a single tooth of the gear 9 to be tested yields or breaks significantly.

[0045] The test device of the present invention is suitable for medium-high speed tensile tests with a tensile speed greater than 0.1 m / s. It mainly solves the problem of acceleration distance in medium-high speed tests, as well as the defects of poor test repeatability and large random errors in the prior art, and provides a standardized platform for medium-high speed tests of single tooth tensile strength of gears. When performing repeated tests, it is only necessary to install the gear 9 to be tested in the matching gear profiling tooling 8 to ensure the repeatability of the test, save most of the tooling adjustment, positioning and other processes, and improve the test efficiency. In the actual meshing condition of the gear, it is generally meshed in a medium-high speed state, so the test provided by the present invention is closer to the actual working condition.

[0046] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A medium and high speed testing device for the tensile strength of a single gear, characterized by: It includes an upper fixed block, a pre-sliding mechanism, a testing mechanism and a lower fixed block, wherein the upper fixed block and the lower fixed block are arranged opposite to each other and are respectively used to be clamped on the upper and lower clamps of the testing machine, the testing mechanism is arranged between the upper fixed block and the lower fixed block, and the pre-sliding mechanism is arranged between the testing mechanism and the upper fixed block or the lower fixed block, and the pre-sliding mechanism can cause a relative movement between the upper fixed block and the pre-sliding mechanism or between the lower fixed block and the pre-sliding mechanism along the axis of the testing machine, and the maximum displacement of the relative movement enables the testing mechanism to reach the stretching speed of the high-speed tensile test; The testing mechanism comprises a pull plate, a pull head and a gear profiling tooling, one end of the pull head is connected to the pull plate, and the other end of the pull head extends outward, the inner side of the extended end is provided with a detection tooth for testing, and the gear profiling tooling is provided with a mounting groove for mounting the gear to be tested on the side opposite to the detection tooth; the contact point between the detection tooth of the pull head and the single tooth of the gear to be tested is located on the central axis of the testing machine; The pre-sliding mechanism comprises a pre-sliding rod and a stopper, wherein one end of the pre-sliding rod is connected to the upper fixed block or the lower fixed block, and the other end is connected to the pull plate, and at least one end between the pre-sliding rod and the upper fixed block or the lower fixed block and between the pre-sliding rod and the pull plate is movably connected, and the stopper is arranged at the end of the pre-sliding rod at the movably connected end, and is used to limit the movement of the upper fixed block and / or the relative displacement between the lower fixed block and the pull plate; The testing mechanism also includes a guide rod, one end of which is connected to the pull plate, and the other end is connected to the upper fixed block or the lower fixed block, and one end of the guide rod is movably connected to the pull plate and the upper fixed block or the lower fixed block, and the other end is fixedly connected.

2. The medium and high speed gear single tooth tensile strength testing device according to claim 1, characterized in that: The pull plate includes a lower connecting portion of a pre-sliding mechanism and a pull head fixing portion. The pull head fixing portion is arranged below the lower connecting portion of the pre-sliding mechanism and is composed of two parallel clamps. The clamps are provided with pin holes that penetrate the clamps horizontally. The lower connecting portion of the pre-sliding mechanism is provided with pull rod mounting holes that match the number and position of the pre-sliding pull rods.

3. The medium and high speed gear single tooth tensile strength testing device according to claim 1, characterized in that: The slider includes a fixing portion and a detection portion, the fixing portion is provided with a pin hole extending transversely therethrough, the detection portion is integrally connected to one side of the fixing portion and extends downward to form an inverted L-shaped structure, and the detection teeth are arranged on the inner side of the detection portion.

4. The medium and high speed gear single tooth tensile strength testing device according to claim 1, characterized in that: The gear profiling tooling includes a fixing part and a gear mounting part, the fixing part is provided with a pin hole penetrating transversely, the gear mounting part is integrally connected to one side of the fixing part and extends upward to form an L-shaped structure, and the gear mounting part is provided with a mounting groove for mounting the gear to be tested.

5. The medium and high speed testing device for the tensile strength of a single gear as claimed in claim 1, characterized in that: The upper fixed block includes a clamping portion on the testing machine and a connecting portion on the pre-sliding mechanism. The clamping portion on the testing machine is integrally connected above the connecting portion on the pre-sliding mechanism to form an inverted T-shaped block structure. The connecting portion on the pre-sliding mechanism is provided with mounting holes on the pull rods that match the number and position of the pre-sliding pull rods.

6. The medium and high speed gear single tooth tensile strength testing device according to claim 1, characterized in that: The lower fixing block includes a lower clamping portion of the testing machine, a profiling tool fixing portion, and a connecting portion for connecting the lower clamping portion of the testing machine and the profiling tool fixing portion together. The lower clamping portion of the testing machine is arranged below the connecting portion, and the profiling tool fixing portion is arranged above the connecting portion, and is composed of two mutually parallel clamping plates, and the clamping plates are provided with pin holes that pass through the clamping plates horizontally.

7. The medium and high speed gear single tooth tensile strength testing device according to claim 1, characterized in that: The upper fixing block, the pre-sliding mechanism, the testing mechanism and the lower fixing block are all made of Unimax die steel with a hardness greater than HRC52.

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