CN117664550A - Leaf spring fatigue test device - Google Patents
Leaf spring fatigue test device Download PDFInfo
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- CN117664550A CN117664550A CN202311730181.9A CN202311730181A CN117664550A CN 117664550 A CN117664550 A CN 117664550A CN 202311730181 A CN202311730181 A CN 202311730181A CN 117664550 A CN117664550 A CN 117664550A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention provides a plate spring fatigue testing device, and relates to the technical field of plate spring testing equipment; the device comprises a frame, a load output mechanism and a base; the device also comprises a force application seat and a force bearing seat; the force application seat is provided with a plurality of pushing pieces, the force bearing seat is correspondingly provided with a pushing piece, and at least one of the pushing pieces and the corresponding pushing piece is provided with a wedge surface; the force application seat and/or the force bearing seat are/is provided with a driving unit so as to drive the pushing piece and/or the pushing piece to slide, so that the pushing piece and the pushing piece can be abutted through the wedge surface or the pushing piece and the pushing piece are separated; when at least one of the pushing pieces is abutted with the corresponding pushing piece, the pushing piece pushes the pushing piece downwards to apply vertical load and horizontal direction to the leaf spring through the guiding of the corresponding wedge surface. The plate spring fatigue testing device disclosed by the invention can be used for conveniently and comprehensively simulating the actual stress condition of the plate spring.
Description
Technical Field
The invention relates to the technical field of leaf spring test equipment, in particular to a leaf spring fatigue test device.
Background
Leaf springs are elastic elements in vehicle suspension systems, and conventional leaf springs are made of spring steel, but due to the high density and heavy weight of spring steel, when used on a vehicle, they can result in an increase in the overall weight of the vehicle, affecting the fuel economy of the vehicle. At present, the composite plate spring has higher fracture reliability and higher fatigue life, and has better application prospect in the field of vehicles.
The existing equipment for testing the fatigue performance of the leaf spring mostly obtains the rigidity of the leaf spring and the fatigue life under the action of vertical circulating load through displacement and load in the vertical direction, but the mode is not comprehensive in performance of testing the composite leaf spring, because the leaf spring of the vehicle can experience different motion states in actual road conditions, such as the extrusion of the leaf spring in the wide span direction in the processes of jumping up, pressing down, braking and acceleration and deceleration of the fluctuating road conditions, and the rolling force applied to the steering of the vehicle. The properties of the leaf springs made of the composite materials are basically consistent and different, but the properties of the leaf springs made of the composite materials are inconsistent; therefore, these forces are negligible when performing the fatigue test of leaf springs, but cannot be ignored when performing the fatigue test of composite leaf springs.
In view of the above problems, the chinese patent application No. 2016106558237 provides a performance testing apparatus for a vehicle longitudinal composite plate spring, which can more comprehensively test the performance of the composite plate spring by measuring the lateral displacement of the plate spring and correcting the stiffness of the plate spring by using the chord length. In addition, the Chinese patent application No. 2016106557639 provides a test bench for testing the high-low temperature fatigue and rolling performance of the composite plate spring, which is additionally provided with a lateral pressurizing test device so as to accurately obtain the actual working performance of the composite plate spring. However, the above solutions cannot more fully simulate the stress condition of the vehicle leaf spring during actual operation.
Aiming at the situation, the Chinese patent application No. 2020109875767 provides a device and a method for testing the temperature and fatigue resistance of a longitudinal composite plate spring, wherein a first load loading system is used for applying load in the thickness direction and/or the length direction of the plate spring to be tested, and a second load loading system is used for applying load in the width direction of the plate spring, so that the stress condition of the plate spring of a vehicle in actual working can be comprehensively simulated.
However, the above solution has the disadvantage that: on the one hand, changing the load loading direction of the first load loading system is required to be carried out manually, so that the method is inconvenient; on the other hand, the first load loading system and the second load loading system both need independent power, so that the structure of the first load loading system and the second load loading system is complex.
Disclosure of Invention
Therefore, the invention provides a leaf spring fatigue testing device, which at least partially solves the technical problems of inconvenient use and complex structure of the existing leaf spring fatigue testing device.
The technical scheme of the invention is as follows:
the invention provides a leaf spring fatigue testing device which comprises a frame, a load output mechanism, a base, a force application seat and a force bearing seat, wherein the load output mechanism is arranged on the frame;
the force application seat is provided with a plurality of pushing pieces, the force bearing seat is provided with pushing pieces which are in one-to-one correspondence with the pushing pieces, and at least one of the pushing pieces and the corresponding pushing pieces is provided with a wedge surface; the force application seat and/or the force bearing seat are/is provided with a driving unit so as to drive the pushing piece and/or the force bearing piece to slide, so that the pushing piece and the force bearing piece can be abutted through the wedge surface or the pushing piece and the force bearing piece are separated;
when each pushing piece is separated from the corresponding pushing piece, the downward movement of the output shaft drives the force application seat to press the force bearing seat downwards, and vertical load is applied to the plate spring;
when at least one of the pushing pieces is abutted with the corresponding pushing piece, the pushing piece is pressed by the downward movement of the output shaft through the guiding of the corresponding wedge surface, and the vertical and horizontal loads are applied to the plate spring.
Further, the force application seat is provided with a driving unit and four pushing pieces; the pushing pieces are uniformly and alternately arranged along the circumferential direction of the force application seat and can be driven by the driving unit to slide on the force application seat respectively; and the sliding direction of two of the four pushing pieces is parallel to the width direction of the plate spring, and the sliding direction of the other two pushing pieces is parallel to the length direction of the plate spring.
Further, a pushing part is respectively arranged on one side of each pushing piece, which is away from the corresponding pushing piece; the sliding direction is parallel to the width direction of the leaf spring, and the bearing and pushing parts on the two pushing pieces and the other two pushing pieces are arranged in a vertically staggered mode.
Further, the driving unit comprises a power device, a rotating shaft and two driving discs, wherein the power device, the rotating shaft and the two driving discs are arranged on the force application seat; the rotating shaft can be driven by the power device to rotate, and the two driving discs are sleeved on the rotating shaft at intervals up and down and are respectively opposite to the bearing pushing parts which are arranged in a staggered way up and down; and the peripheries of the two driving discs are respectively provided with a bulge, and when the driving discs rotate to enable the bulges to be abutted with the bearing pushing parts, the pushing parts slide to positions capable of being abutted with the corresponding bearing pushing parts.
Further, unidirectional bearings are respectively arranged between the two driving discs and the rotating shaft; when the rotating shaft rotates in one direction, the corresponding driving disc can be driven to rotate through one of the two unidirectional bearings, and when the rotating shaft reversely rotates, the corresponding driving disc can be driven to rotate through the other of the two unidirectional bearings.
Further, the force application seat is provided with braking parts corresponding to the two driving discs one by one, the two driving discs are respectively provided with three combining parts, and the braking parts can be combined with the three combining parts alternatively so as to apply resistance to the driving discs; and the driving disc rotates to enable one of the two pushing pieces to be abutted against the corresponding pushing piece, the other of the two pushing pieces to be abutted against the corresponding pushing piece and the two pushing pieces to be separated from the corresponding pushing piece respectively corresponding to the combination of the braking part and the three combining parts.
Further, each of the coupling parts is a ball groove provided on an end surface of the driving disc; the brake part comprises a limiting rod which is slidably arranged on the force application seat, and a second elastic piece which is arranged between the limiting rod and the force application seat, a ball body is arranged at the end part of the limiting rod, and when the driving disc rotates to enable the ball groove to be opposite to the ball body, the limiting rod can be pushed by the second elastic piece to enable the ball body to be inserted into the ball groove.
Further, one end of the ball body is arranged relative to the limiting rod, a pressure sensor is arranged between the other end of the limiting rod and the force application seat, and when the ball body is inserted into the ball groove and when the ball body is pulled out of the ball groove, the pressure applied by the limiting rod to the pressure sensor is unequal.
Further, the driving unit further includes first elastic members respectively disposed between the pushing members and the force applying seat, where the first elastic members apply a pushing force to the pushing members to separate the pushing members from the pushing members.
Further, the load output mechanism is a hydraulic cylinder fixedly arranged on the frame.
The working principle and the beneficial effects of the invention are as follows:
according to the plate spring fatigue testing device, the force application seat is arranged on the output shaft of the load output mechanism, the force bearing seat is fixedly arranged on the plate spring, the plurality of pushing pieces are arranged on the force application seat, the plurality of pushing pieces are arranged on the force bearing seat, and the pushing pieces can be abutted through the wedge surfaces or separated from each other; when each pushing piece is separated from the supporting piece, the force application seat presses the force bearing seat, and only vertical load is applied to the plate spring; when the pushing piece is abutted with the supporting piece through the wedge surface, the force application seat can apply vertical and horizontal loads to the leaf spring when the force application seat presses the supporting seat, and when different pushing pieces are abutted with corresponding supporting pieces, the angle of the horizontal load applied by the force application seat to the leaf spring is different, so that the actual stress condition of the leaf spring can be simulated more conveniently and comprehensively.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a perspective view of a leaf spring fatigue testing device provided by an embodiment of the present invention;
fig. 2 is a schematic view of an installation structure of a leaf spring on a base according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an exploded view of a frame, a force applying seat and a force bearing seat according to an embodiment of the present invention;
FIG. 5 is an exploded view of a force applying seat and a force bearing seat according to an embodiment of the present invention;
FIG. 6 is a front view of a force application seat according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view at B-B in FIG. 6;
FIG. 8 is a schematic diagram of the cooperation of the driving unit and each pushing member according to the embodiment of the present invention;
fig. 9 is a schematic diagram of an internal structure of a force application seat according to an embodiment of the present invention;
fig. 10 is a partial enlarged view at C in fig. 9.
In the figure:
100-frames;
200-load output mechanism, 210-output shaft;
300-a base, 310-a first mounting frame, 311-a pin shaft, 320-a second mounting frame and 321-a lifting lug frame;
410-a force application seat, 420-a force bearing seat;
500-leaf springs;
611-first pushing element, 612-second pushing element, 620-bearing element, 621-wedge face, 630-first elastic element, 640-bearing portion;
700-driving unit, 710-power device, 720-rotating shaft, 730-first driving disk, 731-protrusion, 732-ball groove, 740-second driving disk, 750-first unidirectional bearing, 760-second unidirectional bearing;
800-a braking part, 810-a limiting rod and 820-a second elastic piece.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present embodiment provides a leaf spring fatigue testing device, as shown in fig. 1, which includes a frame 100, a load output mechanism 200, and a base 300. Wherein the load output mechanism 200 is mounted on the frame 100 for outputting a load. In the present embodiment, the load output mechanism 200 is a hydraulic cylinder fixed to the frame 100, and an output shaft 210 described below is a cylinder rod of the hydraulic cylinder, and the output shaft 210 is movable in the vertical direction.
In some embodiments, the load output mechanism 200 may also be a cylinder, an electric telescopic rod, or other mechanism having a member that moves in a straight line.
The base 300 is used to mount the leaf spring 500 to be tested. In this embodiment, referring to fig. 1 and 2, two mounting frames are fixed on the base 300, which are referred to as a first mounting frame 310 and a second mounting frame 320, respectively, for convenience of description.
Referring to fig. 2 and 3, one end of the plate spring 500 is connected to the first mounting bracket 310 through a pin 311, i.e., a through hole opposite to the mounting hole of the plate spring 500 is provided in the first mounting bracket 310, and the pin 311 passes through the through hole and the mounting hole. The other end of the leaf spring 500 is connected with the second mounting frame 320 through the shackle frame 321, i.e., one end of the shackle frame 321 is hinged with the second mounting frame 320, and the other end is hinged with the leaf spring 500.
The above-described mounting method of the leaf spring 500 may refer to a mounting structure of the leaf spring 500 on a vehicle, and will not be described in detail herein. By adopting the similar mounting structure as the plate spring 500 on the vehicle as described above, the fatigue life of the plate spring 500 measured on the plate spring fatigue test device can be made to better reflect the actual fatigue life of the plate spring 500 when used on the vehicle.
Referring to fig. 4 and 5, the plate spring fatigue testing device of the present embodiment further includes a force applying seat 410 fixed to the output shaft 210 of the load output mechanism 200, and a force bearing seat 420 for being fixed to the plate spring 500. When the output shaft 210 drives the force application seat 410 to move downward, the force application seat 410 can push the force bearing seat 420 downward, so that the leaf spring 500 has downward displacement, i.e. a load in the vertical direction is applied to the leaf spring 500.
In this embodiment, a plurality of pushing elements are disposed on the force applying base 410, and thrust bearing elements 620 corresponding to the pushing elements are disposed on the force bearing base 420, and at least one of the pushing elements and the corresponding thrust bearing elements 620 is provided with a wedge surface 621. The force application seat 410 and/or the force bearing seat 420 are/is provided with a driving unit 700 to drive the pushing element and/or the push bearing element 620 to slide, so that the pushing element and the push bearing element 620 can be abutted via the wedge surface 621, or the pushing element and the push bearing element 620 are separated.
In a specific structure, referring to fig. 4 and 5, in this embodiment, wedge surfaces 621 are provided on the pushing member and the corresponding pushing member 620, respectively. Thus, when the pusher continues to move downward after the wedge surface 621 of the pusher is brought into contact with the wedge surface 621 of the thrust piece 620, a vertical component force is applied to the thrust piece 620, even if the leaf spring 500 receives a vertical load, and a horizontal component force is applied to the thrust piece 620, even if the leaf spring 500 receives a horizontal load. In which the specific direction of the horizontal component force is coplanar with the normal direction of the wedge surface 621, it is possible to subject the leaf spring 500 to horizontal loads of different angles by abutting different pushers with the corresponding thrust bearing 620.
In some embodiments, the wedge surface 621 may be provided only on the pushing member, and the pushing member 620 is in line contact with the wedge surface 621; or only the wedge surface 621 is provided on the push member 620, and the push member is in line contact with the wedge surface 621 on the push member 620. Which has the same principle and will not be described in detail here.
In this embodiment, the driving unit 700 is disposed on the force application seat 410, and each pushing member can be driven by the driving unit 700 to slide on the force application seat 410, and the pushing members 620 opposite to each pushing member are all fixed on the force bearing seat 420. I.e. in this embodiment each pusher can slide closer to the pusher 620 or slide away from the pusher 620. It should be noted that the fact that the pushing member and the push-supporting member 620 can abut via the wedge surface 621 means that, during the process of moving the force application seat 410 downward, the pushing member abuts against the push-supporting member 620; the disengagement of the pushing member and the pushing member 620 means that the pushing member and the pushing member 620 do not contact each other during the entire downward movement of the force applying base 410.
In some embodiments, the driving unit 700 may also be disposed on the bearing seat 420, and each pushing element 620 may be driven by the driving unit 700 to slide on the bearing seat 420, and each pushing element is fixed on the force application seat 410.
In some embodiments, the driving unit 700 may be disposed on the force applying seat 410 and the force bearing seat 420, respectively, and the pushing member can slide on the force applying seat 410, and the pushing member 620 can slide on the force bearing seat 420. Both schemes have the same principle as the scheme of the present embodiment, and are not described here again.
In the present embodiment, referring to fig. 6 to 8, four pushing members are provided on the force applying base 410; and wherein the sliding direction of two pushing members is parallel to the width direction of the leaf spring 500, for convenience of description, it will be referred to as a first pushing member 611 in the following case, and the sliding direction of the other two pushing members is parallel to the length direction of the leaf spring 500, it will be referred to as a second pushing member 612 in the following case, and the normal direction of the wedge surface 621 on each pushing member is coplanar with the sliding direction thereof.
Based on the above-described structure, when one of the two first pushers 611 can abut against the corresponding thrust piece 620, the plate spring 500 will receive a vertical load as well as a horizontal load in one width direction of the plate spring 500 when the load output mechanism outputs a load; when the other of the two first pushing members 611 can abut against the corresponding pushing member 620, the plate spring 500 will receive a vertical load, as well as a horizontal load in the other width direction of the plate spring 500.
When one of the two second pushers 612 can abut the corresponding thrust piece 620, the leaf spring 500 will be subjected to a vertical load, as well as a horizontal load along one length direction of the leaf spring 500; when the other of the two second pushers 612 is able to abut the corresponding thrust piece 620, the leaf spring 500 will be subjected to a vertical load, as well as a horizontal load along the other length of the leaf spring 500.
In some embodiments, the pushing elements on the force application seat 410 may be arranged in other numbers or in other positions as needed, which has the same principle and is not described herein.
Referring to fig. 7, the driving unit 700 of the present embodiment includes first elastic members 630 disposed between two first pushing members 611 and the force application seat 410, and between two second pushing members 612 and the force application seat 410, respectively, and each first elastic member 630 applies an elastic pushing force to the corresponding pushing member to disengage the pushing member from the corresponding pushing member 620.
Structurally, the first elastic member 630 of this embodiment is a spring. It should be noted that the first elastic member 630 may be another elastically deformable member.
Referring to fig. 7 and 8, in the present embodiment, a push supporting portion 640 is provided on a side of each push member facing away from the corresponding push supporting member 620; and the bearing parts 640 on the two first pushing members 611 and the bearing parts 640 on the two second pushing members 612 are arranged in a vertically staggered manner.
The driving unit 700 of the present embodiment further includes a power device 710, a rotating shaft 720 and two driving discs disposed on the force applying base 410. The rotating shaft 720 can be driven to rotate by the power device 710, and the two driving discs are sleeved on the rotating shaft 720 at intervals up and down and respectively opposite to the bearing and pushing parts 640 which are arranged in a staggered manner up and down. For convenience of description, the two driving discs will be referred to as a first driving disc 730 and a second driving disc 740 in this embodiment, respectively, where the first driving disc 730 is opposite to the bearing portions 640 on the two first pushing members 611, and the second driving disc 740 is opposite to the bearing portions 640 on the two second pushing members 612.
Referring to fig. 8, the power device 710 of the present embodiment is a motor provided on the force application base 410.
Referring to fig. 7 and 8, the push-supporting portion 640 of the present embodiment is a bump provided on each push member, and protrusions 731 are provided on the outer circumferences of the two driving disks, respectively.
Based on the above structure, the working process of each pushing member in this embodiment is as follows: when the driving disk rotates to make the protrusion 731 on the outer circumference of the driving disk abut against the protrusion on the pushing piece, the pushing piece slides to a position where the pushing piece can abut against the corresponding bearing piece 620; after the driving disk rotates to disengage the protrusions 731 from the protrusions on the pusher, the pusher slides to a position disengaged from the corresponding push-bearing 620 under the pushing of the first elastic member 630.
In this embodiment, a one-way bearing is respectively disposed between the two driving disks and the rotating shaft 720; when the rotating shaft 720 rotates in one direction, one of the two driving disks can be driven to rotate through the corresponding one-way bearing, and when the rotating shaft 720 rotates reversely, the other of the two driving disks can be driven to rotate through the corresponding one-way bearing.
Specifically, referring to fig. 8, a first one-way bearing 750 is provided between the first drive disk 730 and the rotation shaft 720, a second one-way bearing 760 is provided between the second drive disk 740 and the rotation shaft 720, and the first one-way bearing 750 and the second one-way bearing 760 are operated in opposite directions.
Specifically, in the present embodiment, when the rotating shaft 720 rotates clockwise, the first driving disc 730 can be driven to rotate by the first unidirectional bearing 750, and at this time, the rotating shaft cannot drive the second driving disc 740 to rotate; when the rotating shaft 720 rotates anticlockwise, the second driving disc 740 can be driven to rotate through the second unidirectional bearing 760, and at this time, the first driving disc 730 cannot be driven to rotate. The unidirectional bearing can rotate freely in one direction and can be locked in the other direction, and can be made of the existing product, and the structure and the working principle of the unidirectional bearing are not repeated.
In this embodiment, by providing the two unidirectional bearings, the rotation shaft 720 can adjust the positions of the two first pushing members 611 when rotating clockwise, and the positions of the two second pushing members 612 are not changed; and the rotation shaft 720 can adjust the positions of the two second pushing members 612 when rotating anticlockwise, and the positions of the two first pushing members 611 are not changed. Therefore, the solution of this embodiment adopts one motor to independently adjust the positions of the two first pushing members 611 and the two second pushing members 612, that is, the relative positions of the first pushing members 611 and the second pushing members 612 can be changed, so that the actual stress situation of the leaf spring 500 can be comprehensively simulated.
In some embodiments, the first driving disc 730 and the second driving disc 740 may also be respectively and fixedly sleeved on the rotating shaft 720. With the rotation of the rotating shaft 720, the first driving disc 730 and the second driving disc 740 rotate simultaneously, so that the positions of the two first pushing members 611 and the two second pushing members 612 cannot be adjusted independently, that is, the relative positions of the two first pushing members 611 and the two second pushing members 612 are fixed, and the actual stress situation of the leaf spring 500 cannot be simulated more comprehensively.
In this embodiment, the force applying seat 410 is provided with braking portions 800 corresponding to the two driving discs one by one, and the two driving discs are respectively provided with three combining portions, and the braking portions 800 can be combined with the three combining portions alternatively so as to apply resistance to the driving discs. Corresponding to the combination of the brake 800 and the three combining parts, the driving disc rotates to enable one of the two pushing pieces to be abutted with the corresponding push-supporting piece 620, the other of the two pushing pieces can be abutted with the corresponding push-supporting piece 620, and the two pushing pieces are separated from the corresponding push-supporting piece 620.
Specifically, when the braking portion 800 is combined with the first combining portion, one of the two pushing members can abut against the corresponding pushing member 620; when the brake 800 is coupled to the second coupling portion, the other of the two pushers can abut the corresponding push bearing 620; when the brake 800 is engaged with the third engagement portion, both pushing members are disengaged from the corresponding pushing members.
In this embodiment, by providing the braking portion 800, when the rotation shaft 720 does not drive the driving disc to rotate, the driving disc can be kept at the current position, so as to avoid the driving disc from deviating from the current position due to vibration or extrusion caused by the eccentric bearing portion.
The present embodiment will be described by taking the coupling portion on the first driving disc 730 and the opposite braking portion 800 as an example, and the coupling portion on the second driving disc 740 and the opposite braking portion 800 have the same working principle, which will not be described herein.
In a specific structure, referring to fig. 9 and 10, each joint is a ball groove 732 provided on the disk surface of the first drive disk 730; the brake part 800 includes a stop lever 810 slidably disposed on the force applying seat 410, and a second elastic member 820 disposed between the stop lever 810 and the force applying seat 410, wherein a ball is disposed at an end of the stop lever 810, and the first driving disc 730 rotates to align any one of the ball grooves 732 with the ball, and the stop lever 810 can be pushed by the second elastic member 820 to insert the ball into the ball groove 732.
Based on the above structure, when the ball is inserted into the ball groove 732, the rotation of the first driving disk 730 can be restricted; however, when the rotation shaft 720 drives the first driving disc 730 to rotate, that is, after a sufficient torque is applied to the first driving disc 730, the first driving disc 730 can squeeze the ball and compress the second elastic member 820, so that the ball is separated from the ball groove 732, and the first driving disc 730 can rotate.
In this embodiment, one end of the ball is disposed opposite to the stop lever 810, and a pressure sensor is disposed between the other end of the stop lever 810 and the force application seat 410, and when the ball is inserted into the ball groove 732 and when the ball is removed from the ball groove 732, the pressure applied by the stop lever 810 to the pressure sensor is not equal.
In this embodiment, by providing the pressure sensor, since the ball is inserted into the ball groove 732 each time, the pressure received by the pressure sensor is changed, the positions of the two driving disks can be recorded by the number of times of the pressure change received by the pressure sensor, and the positions of the pushing members are determined, so that the positions of the pushing members can be adjusted.
Based on the above structure, the working process of the plate spring fatigue testing device of this embodiment is:
when the two first pushing members 611 and the two second pushing members 612 are separated from the corresponding pushing members 620, only a vertical load is applied to the leaf spring 500 when the output shaft 210 of the load output mechanism 200 moves downward;
when only one of the two first pushing members 611 is capable of abutting against the corresponding bearing member 620, a vertical load is applied to the leaf spring 500 and a horizontal load in the width direction of the leaf spring 500 are applied when the output shaft 210 of the load output mechanism 200 moves downward;
when only one of the two second pushers 612 is able to abut against the corresponding thrust piece 620, a vertical load is applied to the leaf spring 500 and a horizontal load along the length direction of the leaf spring 500 are applied when the output shaft 210 of the load output mechanism 200 moves downward;
when one first pushing piece 611 and one second pushing piece 612 are each capable of abutting against the corresponding push receiving piece 620, a vertical load is applied to the leaf spring 500, a horizontal load in the length direction of the leaf spring 500 and in the width direction of the leaf spring 500, when the output shaft 210 of the load output mechanism 200 moves downward.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a leaf spring fatigue test device, includes frame (100), load output mechanism (200) and base (300), load output mechanism (200) are located on frame (100), base (300) are used for bearing leaf spring (500) of waiting to test, its characterized in that: the device also comprises a force application seat (410) fixedly connected with the output shaft (210) of the load output mechanism (200), and a bearing seat (420) fixedly arranged on the plate spring (500);
the force application seat (410) is provided with a plurality of pushing pieces, the force bearing seat (420) is provided with pushing pieces (620) corresponding to the pushing pieces one by one, and at least one of the pushing pieces and the corresponding pushing pieces (620) is provided with a wedge surface (621); the force application seat (410) and/or the force bearing seat (420) are/is provided with a driving unit (700) so as to drive the pushing piece and/or the pushing piece (620) to slide, so that the pushing piece and the pushing piece (620) can be abutted through the wedge surface (621), or the pushing piece and the pushing piece (620) are separated;
when each pushing piece is separated from the corresponding pushing piece (620), the downward movement of the output shaft (210) drives the force application seat (410) to press the force bearing seat (420) downwards, and vertical load is applied to the plate spring (500);
when at least one of the pushing pieces is abutted against the corresponding pushing piece (620), the pushing piece is pressed against the corresponding pushing piece (620) by the downward movement of the output shaft (210) through the guide of the corresponding wedge surface (621), and the vertical and horizontal loads are applied to the plate spring (500).
2. The plate spring fatigue testing device according to claim 1, wherein the force application seat (410) is provided with a driving unit (700) and four pushing members; each pushing piece is uniformly and at intervals along the circumferential direction of the force application seat (410) and can be driven by the driving unit (700) to slide on the force application seat (410); and the sliding direction of two of the four pushing pieces is parallel to the width direction of the plate spring (500), and the sliding direction of the other two pushing pieces is parallel to the length direction of the plate spring (500).
3. The plate spring fatigue testing device according to claim 2, wherein each of the pushing members is provided with a pushing portion (640) on a side thereof facing away from the corresponding pushing member (620); the push-bearing parts (640) on two push pieces with the sliding direction parallel to the width direction of the plate spring (500) are arranged in a vertically staggered manner with the push-bearing parts (640) on the other two push pieces.
4. A leaf spring fatigue testing device according to claim 3, wherein the drive unit (700) comprises a power means (710) provided on the force application seat (410), a spindle (720) and two drive discs; the rotating shaft (720) can be driven to rotate by the power device (710), and the two driving discs are sleeved on the rotating shaft (720) at intervals up and down and are respectively opposite to the bearing and pushing parts (640) which are arranged in a staggered manner up and down; and the outer circumferences of the two driving disks are respectively provided with a bulge (731), and when the driving disks rotate to enable the bulge (731) to be abutted with the push-supporting part (640), the pushing piece slides to a position capable of being abutted with the corresponding push-supporting piece (620).
5. The plate spring fatigue testing device according to claim 4, wherein a one-way bearing is provided between the two driving disks and the rotating shaft (720), respectively; when the rotating shaft (720) rotates in one direction, the corresponding driving disc can be driven to rotate through one of the two unidirectional bearings, and when the rotating shaft (720) rotates reversely, the corresponding driving disc can be driven to rotate through the other of the two unidirectional bearings.
6. The plate spring fatigue testing device according to claim 5, wherein the force applying seat (410) is provided with braking parts (800) corresponding to two driving discs one by one, the two driving discs are respectively provided with three combining parts, and the braking parts (800) can be combined with the three combining parts alternatively so as to apply resistance to the driving discs; and corresponding to the combination of the braking part (800) and the three combining parts, the driving discs respectively rotate to enable one of the two pushing pieces to be abutted with the corresponding pushing piece (620), enable the other of the two pushing pieces to be abutted with the corresponding pushing piece (620), and enable the two pushing pieces to be separated from the corresponding pushing piece (620).
7. The plate spring fatigue testing device according to claim 6, wherein each of the coupling portions is a ball groove (732) provided on an end surface of the driving disk; the brake part (800) comprises a limit rod (810) slidably arranged on the force application seat (410), and a second elastic piece (820) arranged between the limit rod (810) and the force application seat (410), a ball body is arranged at the end part of the limit rod (810), and when the driving disc rotates to enable the ball groove (732) to be opposite to the ball body, the limit rod (810) can be pushed by the second elastic piece (820) to enable the ball body to be inserted into the ball groove (732).
8. The plate spring fatigue testing device according to claim 7, wherein a pressure sensor is provided between the other end of the stopper rod (810) and the urging seat (410) with respect to one end of the stopper rod (810), and the pressure applied by the stopper rod (810) to the pressure sensor is not equal when the ball is inserted into the ball groove (732) and when the ball is removed from the ball groove (732).
9. The plate spring fatigue testing device according to claim 4, wherein the driving unit (700) further comprises a first elastic member (630) provided between each of the pushing members and the urging seat (410), respectively, the first elastic member (630) exerting a pushing force to disengage the pushing member from the pushing member (620) respectively.
10. The leaf spring fatigue test device according to any one of claims 1 to 9, wherein the load output mechanism (200) is a hydraulic cylinder fixed to the frame (100).
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