Testing device for plate spring

Abstract

The utility model relates to the technical field of spring testing, in particular to a testing device for a plate spring, which comprises a testboard, a support framework fixedly mounted on the testboard, a control host arranged on the side edge of the support framework, a hydraulic machine fixedly mounted at the bottom of the support framework, and a pressing raised head fixedly mounted at the output end of the hydraulic machine. A pressure sensor is arranged in the pressing raised head, two sliding seats are symmetrically arranged on the test board, fixing pieces are arranged on the sliding seats, and a plate spring is fixedly arranged between the two sliding seats. According to the utility model, the distance between the two sliding seats is adjusted through the transmission mechanism so as to adapt to the fixing work of the plate springs with different lengths, the applicability is improved, the integrity of the plate springs is guaranteed by clamping the plate springs through the fixing pieces, the test result of the plate springs is more accurate, and the test efficiency is improved. In addition, the deformation test of the spring is calculated by the control host according to the relation between current and resistance, the accuracy is high, errors of manual observation are reduced, and the accuracy is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spring testing, in particular to a testing device for a leaf spring. Background Art

[0002] Leaf spring is the most widely used elastic element in automobile suspension. It is an elastic beam of approximately equal strength composed of several alloy spring leaves of equal width but unequal length. After installation, the two ends naturally bend upward. When the impact force of the road surface on the wheel is transmitted, the steel plate deforms, which plays a role in buffering and vibration reduction. When arranged longitudinally, it also has the function of guiding and transmitting force. It is a key component in the automobile shock absorption mechanism. Therefore, after the leaf spring is processed and produced, its performance needs to be tested to meet the automobile shock absorption requirements.

[0003] A utility model patent with the authorized patent number CN213041482U discloses a leaf spring test device, including: a main frame consisting of a bottom plate, a side plate and a crossbeam, a downward pressing screw arranged on the crossbeam, a pressing rod fixed to the bottom of the downward pressing screw, and a ruler vertically arranged above the bottom plate for measuring the deformation of the leaf spring, the tooling also has a lower positioning seat for fixing to the free end of the leaf spring, an upper positioning seat located below the pressing rod, and a pressure sensor located between the lower positioning seat and the upper positioning seat. The leaf spring is fixed on the test tooling, and the downward pressing screw of the test tooling is pressed down by artificial torque. The corresponding pressure value is displayed by the matching pressure sensor, and the deformation of the corresponding leaf spring is measured with a ruler to obtain the performance data of a single leaf spring.

[0004] The above patent has the following defects in actual use: the above patent uses a ruler to measure the deformation value of the leaf spring, and there is an observable observation and recording error in the data, and the obtained leaf spring test performance results are not accurate enough. In addition, the above patent uses a pin to fix the leaf spring, which requires punching and fixing the leaf spring, which has a certain degree of damage to the leaf spring structure itself. In addition, when testing leaf springs of different lengths, it is necessary to reposition the punching and fixing, which is troublesome to use and has poor applicability. For this reason, we propose a testing device for leaf springs to solve the above defects. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the prior art and proposes a testing device for a leaf spring.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A testing device for leaf springs, comprising a test bench, wherein a support frame is fixedly mounted on the test bench, a control host is arranged on the side of the support frame, a hydraulic press is fixedly mounted on the bottom of the support frame, a pressure convex head is fixedly mounted on the output end of the hydraulic press, a pressure sensor is arranged inside the pressure convex head, two slides are symmetrically arranged on the test bench, a fixing piece is arranged on the slide, a leaf spring is fixedly mounted between the two slides, a resistor cylinder is arranged on the lower side of the leaf spring, an electrode column is slidingly sleeved inside the resistor cylinder, an axle seat and a support plate are fixedly mounted on both sides of the test bench respectively, a transmission mechanism is arranged between the axle seat and the support plate, the transmission mechanism comprises an earring and a threaded rod, the earring is fixedly mounted on both sides of the slide, the threaded rod is rotatably mounted between the axle seat and the support plate and the threaded rod is screwed through the earring, the right end of the threaded rod is rotatably passed through the support plate and a first gear is fixedly mounted thereon, a motor is fixedly mounted on the right side of the support plate, a second gear is fixedly mounted on the output end of the motor, the second gear is respectively meshed with the two first gears, and the threaded rod is a bidirectional threaded rod.

[0008] Preferably, a hood is fixedly mounted on the right side of the support plate, and the first gear, the motor and the second gear are all located inside the hood.

[0009] Preferably, two slide grooves are symmetrically provided on the test bench, and two protrusions are fixedly mounted on the bottom of the slide seat, and the protrusions are slidably engaged with the slide grooves.

[0010] Preferably, the fixing member is threadedly connected to the sliding seat via bolts, and an anti-skid friction pad is provided on the inner side wall of the fixing member.

[0011] Preferably, the resistor tube and the electrode column are connected to the positive and negative electrodes of the test power supply respectively, and the upper end of the electrode column is in contact with the bottom of the leaf spring.

[0012] Preferably, the surface of the pressure convex head is arranged in an arc shape, and the vertical axis positions of the pressure convex head, the leaf spring and the electrode column coincide with each other.

[0013] Preferably, the hood is provided with an inspection door and heat dissipation holes.

[0014] In the utility model, a testing device for leaf springs is described, through the transmission mechanism set up, when the motor is started, the motor rotates to drive the second gear to rotate, because the second gear is respectively meshed with the two first gears on both sides, then under the meshing transmission of the second gear, the two first gears on both sides rotate at the same speed and direction, thereby driving the threaded rod to rotate, and since the threaded rod is a bidirectional threaded rod, according to the screw transmission relationship, the threaded rod drives the slide seat slidingly set on the test bench to move toward each other, which is manifested as moving away from or approaching each other, and this transmission mechanism is used to adjust the distance between the two slide seats, and by adjusting the distance between the two slide seats, it can be used to fix leaf springs of different lengths, thereby increasing the applicability of the utility model, and a fixing piece is provided on the slide seat, and the leaf spring is clamped by the fixing piece, and then the fixing piece is screwed to the slide seat with bolts, and this way of fixing the leaf spring ensures the integrity of the leaf spring and makes the test result of the leaf spring more accurate.

[0015] In the utility model, a testing device for leaf springs is described. By setting a resistor tube and an electrode column, when the leaf spring is subjected to pressure and begins to bend downward in the middle, the bottom of the leaf spring compresses the electrode column toward the inside of the resistor tube. Since the resistor tube and the electrode column are respectively connected to the positive and negative poles of the test power supply, the effective resistance of the resistor tube in the circuit gradually decreases when the electrode column descends. The control host can calculate the resistance value change by the change of the current value in the test circuit. The linear change value, that is, the descending value of the electrode column, can be calculated by dividing it by the linear resistance change ratio of the resistor tube. This value is equivalent to the leaf spring. The deformation amount of the spring is determined by the pressure sensor. In addition, a pressure sensor is arranged inside the pressure convex head, that is, the control host of the hydraulic press monitors the pressure output value in real time through the pressure sensor during the pressure application process. The control host can draw a "pressure-deformation" relationship chart using the pressure output value and the deformation amount change value of the leaf spring. This chart can intuitively reflect the deformation trend of the leaf spring under pressure. Observation of the chart makes the test results more intuitive and specific. In addition, the deformation test of the leaf spring is calculated by the control host according to the relationship between the current and resistance in the circuit. It has high accuracy, reduces the error of manual observation, and further makes the test result of the leaf spring more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structure diagram of a testing device for leaf springs proposed in the utility model Figure 1 ;

[0017] Figure 2 A three-dimensional structure diagram of a testing device for leaf springs proposed in the utility model Figure 2 ;

[0018] Figure 3 A three-dimensional structure diagram of a testing device for leaf springs proposed in the utility model Figure 3 .

[0019] In the figure: 1. test bench; 2. support frame; 3. control host; 4. hydraulic press; 5. pressure cam; 6. slide seat; 7. fixing piece; 8. leaf spring; 9. resistor tube; 10. electrode column; 11. earring; 12. threaded rod; 13. shaft seat; 14. support plate; 15. machine cover; 16. first gear; 17. motor; 18. second gear; 19. slide groove; 20. bump. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-3 A testing device for leaf springs comprises a test bench 1, a support frame 2 is fixedly mounted on the test bench 1, a control host 3 is arranged on the side of the support frame 2, a hydraulic press 4 is fixedly mounted on the bottom of the support frame 2, a pressure convex head 5 is fixedly mounted on the output end of the hydraulic press 4, a pressure sensor is arranged inside the pressure convex head 5, two slide seats 6 are symmetrically arranged on the test bench 1, a fixing part 7 is arranged on the slide seat 6, a leaf spring 8 is fixedly arranged between the two slide seats 6, a resistance tube 9 is arranged on the lower side of the leaf spring 8, an electrode column 10 is arranged in a sliding sleeve inside the resistance tube 9, and shaft seats 13 and 14 are respectively fixedly mounted on both sides of the test bench 1. A transmission mechanism is arranged between the support plate 14, the shaft seat 13 and the support plate 14, the transmission mechanism includes earrings 11 and threaded rods 12, the earrings 11 are fixedly mounted on both sides of the slide seat 6, the threaded rods 12 are rotatably mounted between the shaft seat 13 and the support plate 14 and the threaded rods 12 are screwed through the earrings 11, the right end of the threaded rods 12 is rotated through the support plate 14 and a first gear 16 is fixedly mounted thereon, a motor 17 is fixedly mounted thereon on the right side of the support plate 14, a second gear 18 is fixedly mounted on the output end of the motor 17, the second gear 18 is respectively meshed with the two first gears 16, and the threaded rods 12 are bidirectional threaded rods.

[0022] Through the above structure, since the threaded rod 12 is a bidirectional threaded rod, its threads are symmetrically arranged relative to the middle position of the rod, and the earrings 11 on the sides of the two slides 6 are respectively screwed to the threaded rod 12 and the screwed threads are in a symmetrical relationship, that is, the directions of the threads are opposite. When the threaded rod 12 rotates, it drives the slides 6 symmetrically slidably installed on the test bench 1 to move toward each other, that is, the two slides 6 move away from each other or relatively close to each other.

[0023] In this embodiment, a hood 15 is fixedly mounted on the right side of the support plate 14 , and the first gear 16 , the motor 17 and the second gear 18 are all located inside the hood 15 . The hood 15 is provided with an inspection door and heat dissipation holes.

[0024] Through the above structure, the key meshing components in the transmission mechanism are encapsulated in the hood 15, thereby improving the protection of the key components and increasing their service life.

[0025] In this embodiment, two slide grooves 19 are symmetrically provided on the test bench 1 , and two protrusions 20 are fixedly installed on the bottom of the slide seat 6 , and the protrusions 20 are slidably engaged with the slide grooves 19 .

[0026] Through the above structure, the sliding engagement relationship between the protrusion 20 and the slide groove 19 enables the slide 6 to have a sliding freedom relative to the test bench 1 in the same direction as the threaded rod 12, and the remaining directions of freedom are restricted by the slide groove 19, which provides movement guidance for the slide 6, so that the slide 6 can move stably under the drive of the threaded rod 12.

[0027] In this embodiment, the fixing member 7 is threadedly connected to the sliding seat 6 by bolts, and an anti-skid friction pad is provided on the inner wall of the fixing member 7 .

[0028] Through the above structure, the fixing member 7 clamps the leaf spring 8 between the two slides 6, and the fixing member 7 can be subsequently screwed and installed on the slide 6 by bolts. At this time, the leaf spring 8 is fixed between the two slides 6. The friction pad arranged on the inner wall of the fixing member 7 increases the clamping friction force of the fixing member 7 on the leaf spring 8, thereby preventing the leaf spring 8 from slipping during the test and causing safety hazards in the test, thereby improving safety protection.

[0029] In this embodiment, the surface of the pressure convex head 5 is arranged in an arc shape, and the vertical axis positions of the pressure convex head 5, the leaf spring 8 and the electrode column 10 coincide with each other.

[0030] Through the above structure, the pressure convex head 5, the leaf spring 8 and the electrode column 10 are arranged so that the vertical axis positions coincide with each other, so that the pressure point, the bending point and the test point are all located at the same vertical position, making the test result more accurate.

[0031] In this embodiment, the resistor tube 9 and the electrode column 10 are connected to the positive and negative electrodes of the test power supply respectively, and the upper end of the electrode column 10 is in contact with the bottom of the leaf spring 8 .

[0032] Through the above structure, when the resistor tube 9 and the electrode column 10 are respectively connected to the positive and negative poles of the test power supply, the effective resistance of the resistor tube 9 in the circuit gradually decreases when the electrode column 10 drops. The control host 3 can calculate the change in resistance value by the change in the current value in the test circuit, and the linear change value can be calculated by dividing it by the linear resistance change ratio of the resistor tube 9, that is, the drop value of the electrode column 10, which is equivalent to the deformation of the leaf spring 8. The above setting converts the deformation of the leaf spring 8 into the current-resistance relationship calculation in the circuit, so that the deformation calculation of the leaf spring 8 is more accurate.

[0033] In the utility model, when in use, the motor 17 is started according to the length of the leaf spring 8 to adjust the distance between the two symmetrically arranged slide seats 6 by driving the threaded rod 12. After the distance is adjusted to a suitable position, the leaf spring 8 is placed flat on the two slide seats 6 in the positive direction. At this time, the fixing parts 7 are clamped on the upper ends of the two sides of the leaf spring 8, and the fixing parts 7 on both sides are screwed and fixed to the corresponding slide seats 6 respectively by bolts. At this time, the leaf spring 8 is fixedly installed on the two slide seats 6, and the test is started later. According to the type of the tested leaf spring 8, the corresponding loading step and limit pressure value are input into the control host 3. Subsequently, the control host 3 controls the hydraulic press 4 to drive the pressure convex head 5 at its lower end to pressurize the leaf spring 8. The bottom of the leaf spring 8 is bent under pressure. At this time, the bottom of the leaf spring 8 compresses the electrode column 10 toward the inside of the resistor tube 9. Due to the resistor tube 9 and the electrode The column 10 is respectively connected to the positive and negative poles of the test power supply, and the effective resistance of the resistor tube 9 in the circuit gradually decreases when the electrode column 10 descends. The control host 3 can calculate the change in resistance value by the change in the current value in the test circuit, and the linear change value can be calculated by dividing it by the linear resistance change ratio of the resistor tube 9, that is, the drop value of the electrode column 10, which is equivalent to the deformation amount of the leaf spring. In addition, a pressure sensor is arranged inside the pressure-applying convex head 5, that is, the hydraulic press 4 controls the host 3 to monitor the pressure output value in real time through the pressure sensor during the pressure application process, and the control host 3 can use the pressure output value and the deformation amount change value of the leaf spring 8 to draw a "pressure-deformation" relationship chart, which can intuitively reflect the deformation trend of the leaf spring 8 under pressure, and the test results can be more intuitive and specific by observing the chart.

[0034] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A testing device for a leaf spring, characterized in that: The test bench (1) comprises a support frame (2) fixedly mounted on the test bench (1), a control host (3) being arranged on the side of the support frame (2), a hydraulic press (4) being fixedly mounted on the bottom of the support frame (2), a pressure convex head (5) being fixedly mounted on the output end of the hydraulic press (4), a pressure sensor being arranged inside the pressure convex head (5), two slide seats (6) being symmetrically arranged on the test bench (1), a fixing member (7) being arranged on the slide seats (6), a leaf spring (8) being fixedly arranged between the two slide seats (6), a resistor cylinder (9) being arranged on the lower side of the leaf spring (8), an electrode column (10) being arranged in a sliding sleeve inside the resistor cylinder (9), an axle seat (13) and a support plate (14) being fixedly mounted on both sides of the test bench (1), and a transmission mechanism being arranged between the axle seat (13) and the support plate (14); The transmission mechanism comprises an earring (11) and a threaded rod (12); the earring (11) is fixedly mounted on both sides of a slide seat (6); the threaded rod (12) is rotatably mounted between a shaft seat (13) and a support plate (14) and the threaded rod (12) is threadedly connected and passes through the earring (11); the right end of the threaded rod (12) is rotatably passed through the support plate (14) and is fixedly mounted with a first gear (16); a motor (17) is fixedly mounted on the right side of the support plate (14); the threaded rod (12) is a bidirectional threaded rod; a second gear (18) is fixedly mounted on the output end of the motor (17); the second gear (18) is respectively meshed with the two first gears (16).

2. A testing device for leaf springs according to claim 1, characterized in that: A hood (15) is fixedly mounted on the right side of the support plate (14); the first gear (16), the motor (17) and the second gear (18) are all located inside the hood (15).

3. A testing device for leaf springs according to claim 1, characterized in that: The test bench (1) is symmetrically provided with two slide grooves (19), and the bottom of the slide seat (6) is fixedly provided with two protrusions (20), and the protrusions (20) are slidably engaged with the slide grooves (19).

4. A testing device for leaf springs according to claim 1, characterized in that: The fixing member (7) is threadedly connected to the sliding seat (6) via bolts, and an anti-skid friction pad is provided on the inner side wall of the fixing member (7).

5. A testing device for leaf springs according to claim 1, characterized in that: The resistance tube (9) and the electrode column (10) are respectively connected to the positive and negative electrodes of the test power supply, and the upper end of the electrode column (10) is in contact with the bottom of the leaf spring (8).

6. A testing device for leaf springs according to claim 1, characterized in that: The surface of the pressure convex head (5) is arranged in an arc shape, and the vertical axis positions of the pressure convex head (5), the leaf spring (8) and the electrode column (10) coincide with each other.

7. A testing device for leaf springs according to claim 2, characterized in that: The hood (15) is provided with an inspection door and heat dissipation holes.

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