Ratchet fatigue clamp suitable for ratchet samples of various specifications

Abstract

The utility model discloses a ratchet fatigue clamp suitable for ratchet samples of various specifications, which comprises a supporting mechanism, a clamping mechanism and a clamping mechanism, the transverse adjusting mechanism is used for transversely adjusting the position of the supporting mechanism so as to adapt to ratchet samples of different specifications; one end of the upper pressure head part is connected with the loading mechanism, and the other end of the upper pressure head part is pressed with a pawl at one end of the ratchet sample through a first self-adaptive centering device; the first self-adaptive centering device is used for adjusting the upper pressure head part to be completely pressed with the contact surface of the ratchet sample when an inclination angle is formed between the upper pressure head part and the contact surface of the sample; the lower pressure head part is connected with the working table of the testing machine and the transverse adjusting mechanism; the lower pressure head part and the upper pressure head part are coaxial; one end of the counter-force seat part is connected with the transverse adjusting mechanism, and the other end of the counter-force seat part is in press fit with a pawl at the other end of the ratchet sample through a second self-adaptive centering device. The ratchet sample is simple and convenient to replace, the labor intensity and the production cost are reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ratchet fatigue fixture technical field, especially to a kind of ratchet fatigue fixture of multiple specifications ratchet sample. BACKGROUND

[0002] For the fatigue performance test of ratchet parts, the test method of the lower clamp body profiling fixed sample and the upper clamp body applied load is generally adopted in the industry at present.

[0003] This traditional ratchet fatigue test fixture has many limitations in practical application: first, the fixture structure is complex, and the machining precision requirement is high, which leads to high manufacturing cost;Second, the operation process is tedious, and the test personnel need to be specially trained to operate skillfully;More importantly, when facing different specifications of ratchet sample, multiple special clamping blocks need to be equipped, which not only increases the test cost, but also greatly prolongs the sample replacement time.

[0004] According to statistics, the preparation time required for replacing different specifications of sample often accounts for more than 30% of the entire test cycle in conventional test.In addition, due to the fixed structure of the traditional fixture, the test personnel often face the problems of low work efficiency and high labor intensity when carrying out large-scale test, which is difficult to meet the demand of modern industry for high-efficiency test. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problems of complex fixture structure, high replacement cost and low work efficiency, and provides a ratchet fatigue fixture suitable for multiple specifications of ratchet sample, which is convenient for replacing ratchet sample and mandrel, realizes the rapid adaptation to multiple specifications of ratchet sample, significantly improves the test efficiency and saves production and labor cost.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A ratchet fatigue fixture suitable for multiple specifications of ratchet sample, comprising:

[0008] Supporting mechanism for supporting ratchet sample;

[0009] Transverse adjusting mechanism for transversely adjusting the position of supporting mechanism to adapt to different specifications of ratchet sample;

[0010] Upper press head part, one end is connected with loading mechanism, and the other end is pressed with the head ratchet claw of ratchet sample through first self-adapting centering device;The first self-adapting centering device is used for adjusting the inclination angle of the contact surface between upper press head part and sample, so that it is completely pressed with the contact surface of ratchet sample;

[0011] The lower pressing head part is connected with the workbench surface of the testing machine and the transverse adjusting mechanism; the lower pressing head part is coaxial with the upper pressing head part;

[0012] The counterforce seat part is connected with the transverse adjusting mechanism at one end and is pressed against the pawl at the other end of the gear rack sample through the second self-adapting centering device, and generates constraint to the sample.

[0013] Further, the supporting mechanism comprises a supporting seat and a mandrel, the supporting seat is connected with the transverse adjusting mechanism, the top end of the supporting seat is provided with a V-shaped port structure for mounting and fixing the gear rack sample and the mandrel; the mandrel is used for supporting the gear rack sample, the gap between the shaft diameter of the mandrel and the aperture of the gear rack sample is matched; the gear rack sample is mounted on the mandrel.

[0014] Further, the transverse adjusting mechanism comprises a transverse moving base plate, the bottom surface of the transverse moving base plate is connected with the workbench surface of the equipment through a positioning nut, the top surface of the transverse moving base plate is connected with the supporting mechanism through a clamping groove and is fixed in position through a locking screw; the lower end of the transverse moving base plate is threadedly connected with the lower pressing head part, and the upper end is rigidly connected with the supporting mechanism through a connecting screw, so as to adjust the transverse position of the supporting mechanism, move the supporting mechanism, and realize the position installation of different specifications of the gear rack sample.

[0015] Further, the upper pressing head part comprises a fixing seat, the top end of the fixing seat is connected with the loading mechanism through a pressing disc by means of a thread.

[0016] Further, the first self-adapting centering device comprises a connecting plate one, a rotating shaft, a connecting plate two and an adjusting shaft; the lower end surface of the fixing seat is provided with a positioning groove which is symmetrically arranged at the center and used for mounting the rotating shaft; the rotating shaft is matched with the adjusting shaft, and the connecting plate one and the connecting plate two are used for the axial positioning between the rotating shaft and the adjusting shaft.

[0017] Further, the bottom end of the lower pressing head part is connected with the workbench surface of the testing machine through a pressing disc by means of a thread.

[0018] Further, the lower pressing head part comprises a connecting seat and a cross beam from bottom to top, one end of the connecting seat is connected with the cross beam through a thread, the other end of the connecting seat is connected with the equipment through a thread, and the thread gap is eliminated through a pressing disc.

[0019] Further, the counterforce seat part comprises a counterforce seat, one end of the counterforce seat is connected with the transverse adjusting mechanism, the other end of the counterforce seat is pressed against the pawl at the other end of the gear rack sample through the second self-adapting centering device, and generates constraint to the sample.

[0020] Further, the second self-adapting centering device comprises an adjustable screw rod, an adjusting block and a pressing plate, the adjustable screw rod is obliquely threadedly connected on the upper end of the counterforce seat, the end of the adjustable screw rod is connected with the adjusting block and the pressing plate, the adjusting block is pressed against the pawl at the other end of the gear rack sample and generates constraint to the sample.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] The ratchet fatigue clamp suitable for various specifications of ratchet samples has simple and convenient replacement of ratchet and mandrel, less supporting parts, wider and more convenient adaptation range, reduced labor intensity and production cost, and improved production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the skilled in the art better understand the technical scheme of the utility model, the following will be combined with the drawings and embodiments to make further detailed introduction to the utility model.

[0024] Figure 1 It is a front view of the ratchet fatigue clamp suitable for various specifications of ratchet samples of the utility model.

[0025] Figure 2 It is a view of the supporting mechanism of the utility model.

[0026] Figure 3 It is a view of the transverse adjusting mechanism of the utility model.

[0027] Figure 4 It is a view of the lower pressing head part of the utility model.

[0028] Figure 5 It is a view of the upper pressing head part of the utility model.

[0029] Figure 6 It is a view of the counterforce seat part of the utility model.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, supporting mechanism, 2, transverse adjusting mechanism, 3, upper pressing head part, 4, lower pressing head part, 5, counterforce seat part, 6, loading mechanism, 7, workbench surface, 8, support seat, 9, mandrel, 10, transverse bottom plate, 11, fixed seat, 12, connecting plate one, 13, rotating shaft, 14, connecting plate two, 15, adjusting shaft, 16, crossbeam, 17, connecting seat, 18, counterforce seat, 19, adjustable screw rod, 20, adjusting block, 21, pressing plate. DETAILED DESCRIPTION

[0032] In order to make the skilled in the art better understand the technical scheme of the utility model, the following will be combined with the drawings and embodiments to make further detailed introduction to the utility model.

[0033] As Figures 1-6As shown, the utility model provides a kind of suitable for a variety of specifications ratchet fatigue fixture of ratchet sample, including support mechanism 1, transverse adjusting mechanism 2, upper pressure head part 3, lower pressure head part 4 and counterforce seat part 5 etc.Component.Wherein:

[0034] (1) support mechanism

[0035] Support mechanism 1, such as Figure 2 It is used to support ratchet sample.

[0036] Specifically, the support mechanism 1 includes support seat 8 and mandrel 9, support seat 8 is connected with transverse adjusting mechanism 2, support seat 8 top end is equipped with V-shaped mouth structure, for installing and fixing ratchet sample and mandrel 9;Mandrel 9 is used to support ratchet sample, and the gap of the shaft diameter of mandrel 9 and the aperture of ratchet sample is matched;Ratchet sample is installed on mandrel 9.

[0037] It has been proved that the cooperation gap H7 / f6 is more appropriate, which can ensure that the test ratchet sample is free to rotate on mandrel 9, and noise will not be generated in the experiment process;The V-shaped mouth structure of support seat 8 can adapt to different diameter mandrels 9, and automatic centering can be realized.

[0038] Different specifications of ratchet sample match corresponding mandrel, and different size samples only need to replace the mandrel of corresponding size, and can be positioned and installed on support mechanism, which can automatically position the center without adjustment.

[0039] (2) transverse adjusting mechanism

[0040] Transverse adjusting mechanism 2, such as Figure 3 It is used to adjust the position of support mechanism 1 transversely to adapt to different specifications of ratchet sample.

[0041] The transverse adjusting mechanism 2 includes horizontal movement base plate 10, the bottom surface of horizontal movement base plate 10 is connected with equipment workbench 7 through positioning nut, the top surface of horizontal movement base plate 10 is connected with support mechanism 1 through clamping groove, and the position of support mechanism 1 is fixed through locking screw;The lower end of horizontal movement base plate 10 is connected with lower pressure head part 4 through interface screw thread, and the upper end is rigidly connected with support mechanism 1 through connecting screw, to adjust the transverse position of support mechanism 1, and then move support mechanism, to realize the position installation of different specifications of ratchet sample.

[0042] (3) upper pressure head part

[0043] Upper pressure head part 3, such as Figure 4 One end is connected with loading mechanism 6, and the other end is pressed with the head pawl of ratchet sample through first self-adapting centering device.

[0044] Specifically, the upper pressing head part 3 comprises a fixed seat 11, the top end of which is connected with the loading mechanism 6 through a pressing disc by screwing.

[0045] The first self-adaptive centering device is used to adjust the upper pressing head part 3 to be completely pressed with the ratchet sample when the contact surface of the upper pressing head part 3 with the ratchet sample has an inclination.

[0046] Specifically, the first self-adaptive centering device comprises a connecting plate one 12, a rotating shaft 13, a connecting plate two 14 and an adjusting shaft 15; the upper end of the fixed seat 11 is connected with the equipment by screwing, and the screw gap is eliminated through a pressing disc; the lower end surface of the fixed seat 11 is provided with a positioning groove which is symmetrically arranged at the center and used to install the rotating shaft 13; the rotating shaft 13 and the adjusting shaft 15 are rotationally connected to the upper end and the lower end of the connecting plate two 14, and the connecting plate one 12 is connected between the two connecting plate twos 14; the rotating shaft 13 cooperates with the adjusting shaft 15, and the connecting plate one 12 and the connecting plate two 14 are used for axial positioning between the rotating shaft 13 and the adjusting shaft 15.

[0047] The upper pressing head part 3 can move up and down in a large range with the loading mechanism of the experimental equipment to adapt to different specifications of the ratchet sample; according to the specifications of the ratchet sample, a core shaft of different specifications can be selected and installed.

[0048] (4) Lower pressing head part

[0049] The lower pressing head part 4 is connected with the workbench surface of the testing machine and the transverse adjusting mechanism 2, as shown in Figure 5 The lower pressing head part 4 is coaxial with the upper pressing head part 3.

[0050] The upper end of the lower pressing head part 4 is connected with the transverse bottom plate 10, and the lower end is connected with the workbench surface 7 of the testing machine by screwing through a pressing disc; the lower pressing head part 4 is coaxial with the upper pressing head part 3; the screw gap is eliminated through a pressing disc to realize reliable connection with the testing machine.

[0051] Specifically, the lower pressing head part 4 comprises a connecting seat 17 and a cross beam 16 from bottom to top; one end of the connecting seat 17 is connected with the cross beam 16 by screwing, and the other end is connected with the equipment by screwing and the screw gap is eliminated through a pressing disc.

[0052] (5) Counterforce seat part

[0053] The counterforce seat part 5 is connected with the transverse adjusting mechanism 2 at one end, and is connected with the other pawl of the ratchet sample through the second self-adaptive centering device at the other end to press and constrain the sample, as shown in Figure 6

[0054] ​Specifically, the reaction seat part 5 includes a reaction seat 18, one end of which is connected to the lateral adjustment mechanism 2, and the other end of the reaction seat 18 is pressed against the other end of the ratchet sample by the second adaptive centering device, thereby constraining the sample.

[0055] The second adaptive centering device includes an adjustable screw 19, an adjusting block 20, and a pressure plate 21. The adjustable screw 19 is inclinedly threaded to the upper end of the reaction seat 18. The end of the adjustable screw 19 is connected to the adjusting block 20 and the pressure plate 21. The adjusting block 20 presses against the pawl at the other end of the ratchet sample and constrains the sample.

[0056] The aforementioned adjusting shaft 15 and adjusting block 20 are made of high-strength alloy steel through tempering and quenching, resulting in high mechanical strength and ensuring service life.

[0057] Using an adaptive centering device to load ratchet specimens accurately simulates the actual stress conditions of ratchet teeth, meeting experimental requirements. Different specifications of ratchet specimens can be adapted simply by replacing the corresponding mandrel. This ensures the adjusting shaft is in a good stress state, meeting the fatigue testing needs of ratchet specimens of different specifications. Specimen replacement is simple and convenient, positioning is reliable, production costs are low, and efficiency is high.

[0058] The ratchet pattern can rotate freely around its own axis to ensure that the loaded ratchet pawl is subjected to balanced forces, thereby simulating the real stress state of the ratchet sample and ensuring the accuracy of the experimental results.

[0059] The upper and lower pressure heads are connected to the working table and loading mechanism of the testing machine via threads, respectively. The upper pressure head has an adaptive centering function to ensure the coaxiality of the upper and lower pressure heads, which meets the experimental requirements. After assembly, it is necessary to ensure that the adjusting seat can swing slightly left and right on the rotating shaft to compensate for the influence of the different axes of the upper and lower parts of the testing equipment on the ratchet fatigue test.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ratchet fatigue fixture suitable for ratchet specimens of various specifications, characterized in that, include: Support mechanism (1) is used to support the ratchet sample; Lateral adjustment mechanism (2) is used to laterally adjust the position of support mechanism (1) to accommodate ratchet samples of different specifications; The upper pressure head part (3) is connected to the loading mechanism (6) at one end, and the other end is pressed against the ratchet pawl at one end of the ratchet sample through the first adaptive centering device; the first adaptive centering device is used to adjust the upper pressure head part (3) to the sample contact surface so that it is fully pressed against the ratchet sample contact surface when the contact angle between the upper pressure head part (3) and the sample is tilted. The lower pressure head (4) is connected to the working table of the testing machine and the transverse adjustment mechanism (2); the lower pressure head (4) is coaxial with the upper pressure head (3); The reaction seat part (5) is connected to the lateral adjustment mechanism (2) at one end, and the other end is pressed against the pawl at the other end of the ratchet sample through the second adaptive centering device, thereby constraining the sample.

2. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The support mechanism (1) includes a support base (8) and a mandrel (9). The support base (8) is connected to the lateral adjustment mechanism (2). The top of the support base (8) is provided with a V-shaped opening structure for installing and fixing the ratchet sample and the mandrel (9). The mandrel (9) is used to support the ratchet sample. The diameter of the mandrel (9) is clearance-fitted with the diameter of the ratchet sample hole. The ratchet sample is installed on the mandrel (9).

3. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The lateral adjustment mechanism (2) includes a lateral base plate (10). The bottom surface of the lateral base plate (10) is connected to the worktable surface (7) of the equipment through a positioning nut. The top surface of the lateral base plate (10) is connected to the support mechanism (1) through a slot, and the position of the support mechanism (1) is fixed by a locking screw. The lower end of the lateral base plate (10) is threadedly connected to the interface of the lower pressure head part (4), and the upper end is rigidly connected to the support mechanism (1) through a connecting screw, so as to adjust the lateral position of the support mechanism (1) and move the support mechanism to realize the position installation of ratchet samples of different specifications.

4. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The upper pressure head part (3) includes a fixed seat (11), the top of which is connected to the loading mechanism (6) by a thread through the pressure plate.

5. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 4, characterized in that, The first adaptive centering device includes a connecting plate one (12), a rotating shaft (13), a connecting plate two (14), and an adjusting shaft (15); the lower end face of the fixed seat (11) is provided with a positioning groove, which is symmetrically centered and used to install the rotating shaft (13); the rotating shaft (13) cooperates with the adjusting shaft (15), and the connecting plate one (12) and the connecting plate two (14) are used for axial positioning between the rotating shaft (13) and the adjusting shaft (15).

6. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The bottom end of the lower pressure head (4) is connected to the working table (7) of the testing machine by a thread through the pressure plate.

7. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The lower pressure head part (4) includes a connecting seat (17) and a crossbeam (16) from bottom to top. One end of the connecting seat (17) is connected to the crossbeam (16) by a thread, and the other end of the connecting seat (17) is connected to the equipment by a thread, and the thread gap is eliminated by the pressure plate.

8. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 1, characterized in that, The reaction seat part (5) includes a reaction seat (18), one end of which is connected to the lateral adjustment mechanism (2), and the other end of the reaction seat (18) is pressed against the other end of the ratchet sample through the second adaptive centering device, thereby constraining the sample.

9. The ratchet fatigue fixture applicable to ratchet specimens of various specifications according to claim 8, characterized in that, The second adaptive centering device includes an adjustable screw (19), an adjusting block (20) and a pressure plate (21). The adjustable screw (19) is inclinedly threaded to the upper end of the reaction seat (18). The end of the adjustable screw (19) is connected to the adjusting block (20) and the pressure plate (21). The adjusting block (20) presses against the pawl at the other end of the ratchet sample and constrains the sample.

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