A buffer life detection device

Abstract

The present invention relates to the technical field of buffer detection, and specifically relates to a buffer life detection device, which includes a fixed bracket. A limiting mechanism for calibrating the initial state of the buffer is fixedly installed on the top of the fixed bracket; a hydraulic tank is fixedly sleeved on the side wall of the limiting mechanism. A sealing plate that slides along its height direction is arranged in the hydraulic tank, and the sealing plate is also slidably sleeved on the limiting mechanism; a plurality of connecting rods are fixedly installed at the bottom of the sealing plate. The bottoms of the plurality of connecting rods pass through the hydraulic tank and are respectively connected with extrusion devices. Pressure sensors are embedded at the bottoms of the extrusion devices and the bottom of the limiting mechanism. In the initial state, the bottoms of the extrusion devices are flush with the bottom of the limiting mechanism. This device can accurately measure the recovery state of the buffer every time during the process of repeatedly extruding the buffer, thereby facilitating the staff to evaluate the service life of the buffer.

Description

Technical Field

[0001] The present invention relates to the technical field of buffer detection, and more particularly, to a buffer life detection device. Background Art

[0002] As a core component in a mechanical system for absorbing impact kinetic energy, the decline in the elastic recovery performance of a buffer directly determines the safety life of the buffer. The current industry's fatigue test methods (such as those specified in GB / T 15168-2013 "Test Methods for Static and Dynamic Performance of Vibration and Shock Isolators") mostly indirectly evaluate the life by accumulating the number of compressions and the deformation amount. Most of the buffer life detection devices currently used in laboratories are achieved by visual positioning verification, that is, the operator needs to cooperate to observe the physical position of the buffer piston rod after reset, and perform manual visual confirmation through a scale ruler or a limit mark. When detecting in this way, the error is relatively large. For example, when using the visual inspection method, the identification accuracy of the displacement deviation is usually greater than 0.5 mm, and for the scale ruler, the graduation value is mostly 1 mm, and the detection error is usually within ±0.1 mm, which cannot meet the detection requirements of high-precision buffers (such as aviation hydraulic buffers, precision machine tool buffers, etc.). Moreover, using the above traditional method, it is impossible to accurately judge whether there is a phenomenon of jamming in the buffer.

[0003] After retrieval, the applicant found that some patent technologies have made some improvements in the direction of accurate detection of buffer reset. For example, the buffer shock test device disclosed in Chinese Patent (CN202442858U), the shock platform of this device forms a surface contact with the piston rod of the buffer, and the shock platform is lifted by starting a hydraulic mechanism to squeeze the buffer. Its trigger condition is that the rocker arm is locked with the handle, the lever lock is unlocked by opening a micro switch, the buffer moves in the reverse stroke towards the shock platform, and the electronic stopwatch starts counting; when the shock platform returns to its original position, the electronic stopwatch stops counting; the electronic stopwatch records the instantaneous time of the reverse stroke of the piston rod, and observes whether there are phenomena such as blockage and impact vibration of the piston rod, so as to provide a basis for judging the reverse stroke shock time of the buffer.

[0004] Adopting the above solution, although the reset situation of the buffer can be detected, since the buffer needs to push the shock platform to detect the reset situation, its application scenario can only be on-load detection. However, in actual detection, when it is necessary to horizontally compare the reset situations of different models of buffers (to evaluate the quality differences between buffers), no-load detection is required. The no-load condition can ensure the unity of test environment variables and better establish a time response curve to evaluate the buffer life. Therefore, the applicant invented a detection device that can detect the reset situation of the buffer at high frequency under no-load conditions and then evaluate the service life of the buffer. Summary of the Invention

[0005] The object of the present invention is to provide a buffer life detection device, which can accurately measure the recovery state of the buffer each time during the process of repeatedly squeezing the buffer, thereby facilitating the staff to evaluate the service life of the buffer.

[0006] The present invention is implemented as follows. A buffer life detection device includes a fixed bracket, and a limiting mechanism for calibrating the initial state of the buffer is fixedly installed on the top of the fixed bracket; a hydraulic tank is fixedly sleeved on the side wall of the limiting mechanism, a sealing plate that slides along the height direction thereof is arranged in the hydraulic tank, and the sealing plate is also slidably sleeved on the limiting mechanism; a plurality of connecting rods are fixedly installed at the bottom of the sealing plate, the bottoms of the plurality of connecting rods pass through the hydraulic tank and are respectively connected with extrusion devices, and pressure sensors are embedded at the bottoms of the extrusion devices and the bottom of the limiting mechanism. In the initial state, the bottoms of the extrusion devices are flush with the bottom of the limiting mechanism.

[0007] A hydraulic mechanism is arranged on the fixed bracket, the liquid inlet and outlet ends of the hydraulic mechanism are connected with a telescopic pipe, and the end of the telescopic pipe is fixedly connected with the top of the hydraulic tank and is internally communicated.

[0008] A circular cylinder is installed at the bottom of the fixed bracket, and a plurality of fixing mechanisms for fixing the buffer are installed on the inner side wall of the circular cylinder.

[0009] Furthermore, the limiting mechanism includes a fixed cylinder body I, a spring I, a piston I, a push rod I and a push plate; the fixed cylinder body I is vertically installed on the top of the fixed bracket, the spring I is fixedly installed in the fixed cylinder body I, the top of the spring I is fixedly connected with the top of the fixed cylinder body I, the bottom of the spring I is fixedly connected with the piston I, and the piston I is in sliding contact with the fixed cylinder body I; the bottom of the piston I is fixedly connected with the top of the push rod I, the bottom of the push rod I is fixedly connected with the top surface of the push plate, and the pressure sensor is embedded in the bottom surface of the push plate; the top of the fixed cylinder body I is connected with the hydraulic mechanism.

[0010] Furthermore, the hydraulic mechanism includes an oil storage tank, a hydraulic pump, a connecting main pipe, a regulating valve and two connecting branch pipes; the liquid inlet end of the hydraulic pump is connected with the oil storage tank, and the two ends of the connecting main pipe are respectively connected with the liquid outlet end of the hydraulic pump and the regulating valve; one ends of the two connecting branch pipes are simultaneously connected with the regulating valve, and the other ends are respectively connected with the telescopic pipe and the limiting mechanism.

[0011] Furthermore, the regulating valve includes a spherical shell body, a rotating sphere and a stepping motor. The spherical shell body is simultaneously connected with the connecting main pipe and the two connecting branch pipes, the rotating sphere is rotatably arranged in the spherical shell body, the output end of the stepping motor is fixedly connected with the rotating sphere, and an L-shaped channel is opened in the rotating sphere. One end of the L-shaped channel is communicated with the connecting main pipe, and the other end is a free end and can be respectively connected with the two connecting branch pipes.

[0012] Further, the extrusion device includes an extrusion cylinder body, spring four, piston two, push rod two, return pipe, solenoid valve and elastic one-way valve; the connecting rod is a hollow rod, the top of the connecting rod communicates with the space above the sealing plate in the hydraulic tank, the bottom of the connecting rod communicates with the extrusion cylinder body, a spring three is sleeved on the outer side wall of the connecting rod, and both ends of the spring three are fixedly connected to the sealing plate and the bottom of the hydraulic tank respectively; the elastic one-way valve is installed at the connection between the extrusion cylinder body and the connecting rod, the piston two is hermetically and slidably arranged on the inner side wall of the extrusion cylinder body, and both ends of the spring four are fixedly connected to the piston two and the end of the extrusion cylinder body respectively; the end of the push rod two is fixedly connected to the side wall of the piston two away from the spring four, and the end of the push rod two away from the piston two is located outside the pressurizing cylinder body; the pressure sensor is embedded in the bottom surface of the push rod two, and in the initial state, the bottom surface of the push rod two is flush with the bottom surface of the limiting mechanism; both ends of the return pipe are respectively connected to the extrusion cylinder body and the connecting rod, and the solenoid valve is installed on the return pipe.

[0013] Further, the elastic one-way valve includes a spring five and a sealing baffle, one end of the spring five is fixedly connected to the inner side wall of the connecting rod, the other end is fixedly connected to the top surface of the sealing baffle, and in the initial state, the top surface of the sealing baffle is in contact with the inner side wall of the extrusion cylinder body.

[0014] Further, the extrusion device is multiple push rods four, the tops of the multiple push rods four are fixedly connected to the bottom of the connecting rod, and the pressure sensor is embedded in the bottom of the push rod four.

[0015] Further, the fixing mechanism includes a fixing cylinder body two, spring two, push rod three and clamping plate; one end of the fixing cylinder body two is fixedly installed on the inner side wall of the annular cylinder, the spring two is installed inside the fixing cylinder body two, one end of the spring two is fixedly connected to the end of the fixing cylinder body, the other end is fixedly connected to the end of the push rod three, the push rod three is hermetically and slidably in contact with the inner side wall of the fixing cylinder body two, and the end of the push rod three away from the spring two is fixedly connected to the clamping plate; an oil storage cavity is formed in the annular cylinder, and multiple fixing cylinder bodies two are all communicated with the oil storage cavity; the hydraulic mechanism is communicated with the oil storage cavity.

[0016] The present invention also provides a method for detecting the life of a buffer, which specifically includes the following steps:

[0017] S1: Drive the limiting mechanism to move through the hydraulic mechanism, so that the bottom surface of the limiting mechanism contacts the buffer piston rod, and record the pressure value received by the limiting mechanism at this time;

[0018] S2: Drive the extrusion device to compress the buffer. When the extrusion device can no longer apply pressure, mark this moment as the zero moment, and the extrusion device returns to the initial position;

[0019] S3: When the limiting mechanism senses the pressure value again, record the final pressure value and the buffer recovery duration;

[0020] S4: Repeat the operations of S1 - S3. Finally, evaluate the anti-fatigue ability and service life of the buffer based on the pressure values recorded each time and the buffer recovery duration.

[0021] Furthermore, in S2, it is determined whether the extrusion device can continue to apply pressure by judging the liquid flow rate in the hydraulic mechanism or the pressure value received by the extrusion device.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The limiting mechanism and the extrusion device are simultaneously connected to the hydraulic mechanism. The connecting main pipe and two connecting branch pipes in the hydraulic mechanism are simultaneously connected to the regulating valve. In this way, the hydraulic mechanism can separately push the limiting mechanism and the extrusion device, thereby successively realizing the positioning of the extrusion device and the operation of the pressing device to press the buffer; in addition, the hydraulic mechanism is communicated with the oil storage cavity in the annular cylinder, and multiple fixing mechanisms are also communicated with the oil storage cavity. In this way, when the extrusion device presses the buffer, the fixing mechanism can fix the buffer by the action of hydraulic pressure. And with this structural design, the greater the pressure value received by the buffer, the better the fixing effect of the fixing mechanism on it, improving the stability of the equipment during the detection process;

[0024] 2. The connecting rod is set as a hollow rod, and an elastic one-way valve is arranged at the connection between the connecting rod and the extrusion cylinder body. At the same time, both sides of the second piston are respectively connected to the fourth spring and the second push rod. In this way, under the continuous pressure of the hydraulic mechanism, the second push rod can first press the buffer, so that the piston rod moves to the maximum stroke, and then the second push rod contracts into the extrusion cylinder body, thereby measuring the duration for the piston rod of the buffer to return to the initial position under no-load conditions, and then judging the reset situation of the buffer; in addition, a return pipe with a solenoid valve is arranged between the extrusion cylinder body and the connecting rod. The return pipe can make the liquid in the extrusion cylinder body flow back into the connecting rod, so that the second push rod returns to the initial position. In this way, the extrusion device can repeatedly press the buffer, and combined with the multiple reset situations of the buffer, the quality of the buffer can be evaluated and its service life can be estimated;

[0025] 3. The bottom of the connecting rod is directly fixedly connected to the fourth push rod. The piston rod of the buffer is pressed to the maximum stroke position through the fourth push rod, and the fourth push rod returns to the initial position under the pushing action of the buffer, thereby detecting the reset situation of the buffer under load and then evaluating the service life of the buffer;

[0026] 4. In the spherical shell, the rotating sphere is arranged in the spherical shell and is driven to rotate by a stepping motor. One end of the L-shaped channel in the rotating sphere is always communicated with the connecting main pipe, and the other end can be respectively communicated with the two connecting branch pipes. With this structural design, not only can the flow direction of the liquid be adjusted, but also the liquid that pushes the first piston to move can be sealed in the limiting mechanism, so that the push plate of the limiting mechanism is kept in the specified position. Description of the Drawings

[0027] Figure 1 FIG. 5 is a schematic view of the external structure of a buffer life detection device provided in Embodiment 1 of the present invention;

[0028] Figure 2 FIG. 9 is a schematic view of the structure of a buffer life detection device provided in Embodiment 1 of the present invention in an initial state when it is attached to a buffer;

[0029] Figure 3 FIG. 13 is a schematic view of the structure of a buffer life detection device provided in Embodiment 1 of the present invention when the buffer is being squeezed by the squeezing device;

[0030] Figure 4 FIG. 17 is a schematic view of the structure of a buffer life detection device provided in Embodiment 1 of the present invention when the second push rod of the squeezing device retracts into the squeezing cylinder;

[0031] Figure 5 FIG. 21 is a schematic view of the connection structure between the squeezing device and the hydraulic tank provided in Embodiment 1 of the present invention;

[0032] Figure 6 is Figure 5 an enlarged view of part A in FIG.

[0033] Figure 7 FIG. 31 is a top view cross-sectional view of multiple squeezing devices in Embodiment 1 of the present invention;

[0034] Figure 8 FIG. 35 is a top view cross-sectional view of the fixing mechanism in Embodiment 1 of the present invention;

[0035] Figure 9 FIG. 39 is a schematic view of the structure of the regulating valve in Embodiment 1 of the present invention;

[0036] Figure 10 FIG. 43 is a schematic view of the structure of a buffer life detection device in an initial state when it is attached to a buffer in Embodiment 2 of the present invention;

[0037] Figure 11 FIG. 47 is a schematic view of the connection structure between the squeezing device and the hydraulic tank provided in Embodiment 2 of the present invention.

[0038] The reference numerals involved in the above drawings are as follows:

[0039] 1. Top plate; 2. Hydraulic tank; 3. Extrusion cylinder; 4. Support frame; 5. Buffer; 6. Ring cylinder; 7. Bottom plate; 8. Hydraulic pump; 9. Main connecting pipe; 10. Telescopic pipe; 11. Spherical shell; 12. Connecting branch pipe; 13. First fixed cylinder; 14. First push rod; 15. Oil storage cavity; 16. Third push rod; 17. Clamping plate; 18. Second fixed cylinder; 19. Second spring; 20. Second push rod; 21. Connecting rod; 22. Fourth push rod; 23. L-shaped channel; 24. First spring; 25. First piston; 26. Sealing plate; 27. Pushing plate; 28. Pressure sensor; 29. Fourth spring; 30. Third spring; 31. Second piston; 32. Return pipe; 33. Solenoid valve; 34. Fifth spring; 35. Sealing baffle; 36. Stepper motor; 37. Rotating sphere. Detailed implementation mode

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0042] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Refer to Figures 1 - 11 as shown, which is a preferred embodiment provided by the present invention.

[0044] Embodiment 1: A buffer life detection device, including a fixed bracket, as Figure 1 shown, the fixed bracket is mainly composed of a top plate 1, a bottom plate 7 and a plurality of support frames 4. The top plate 1 and the bottom plate 7 are respectively fixedly installed at the top and bottom of the support frame 4. A limiting mechanism is fixedly installed on the top plate 1, and the limiting mechanism is used to calibrate the initial state of the buffer 5, as Figure 2As shown, the limiting mechanism mainly consists of a fixed cylinder 13, a first spring 24, a first piston 25, a first push rod 14 and a push plate 27. The fixed cylinder 13 is vertically and fixedly installed on the top plate 1. The first spring 24 and the first piston 25 are both installed inside the fixed cylinder 13. The two ends of the first spring 24 are respectively fixedly connected to the top of the fixed cylinder 13 and the first piston 25. The first piston 25 is in sliding and sealing contact with the inner side wall of the fixed cylinder 13. The bottom surface of the first piston 25 is fixedly connected to the top of the first push rod 14. The bottom of the first push rod 14 is fixedly connected to the top surface of the push plate 27. The pressure sensor 28 is embedded in the bottom surface of the push plate 27. The top of the fixed cylinder 13 is connected to the hydraulic mechanism. In this embodiment, the hydraulic mechanism pressurizes the hydraulic oil into the fixed cylinder 13 to push the first piston 25 to move downward, so that the push plate 27 moves to the position where it contacts the piston rod of the buffer 5, and the pressure sensor 28 on the bottom surface of the push plate 27 can receive a relatively small pressure value.

[0045] In order to accurately detect the recovery state of the buffer 5 after being squeezed, as shown in combination with Figure 2 and Figure 5 , a hydraulic tank 2 is fixedly sleeved on the first push rod 14. A sealing plate 26 that can slide along the internal height direction of the hydraulic tank 2 is arranged inside the hydraulic tank 2, and the sealing plate 26 is in sealing and sliding contact with the first push rod 14. Four connecting rods 21 are fixedly installed on the bottom surface of the sealing plate 26. The bottoms of the four connecting rods 21 all pass through the bottom of the hydraulic tank 2 and are respectively installed with extrusion devices for extruding the buffer 5. The four extrusion devices are distributed as shown in Figure 7 . In order to enable the extrusion device to return to the initial position, a third spring 30 is also sleeved on the connecting rod 21. One end of the third spring 30 is fixedly connected to the sealing plate 26, and the other end is fixedly connected to the bottom of the hydraulic tank 2. The top of the hydraulic tank 2 is connected to the hydraulic mechanism. The hydraulic mechanism pressurizes to push the sealing plate 26 to move downward, so that the extrusion device extrudes the piston rod of the buffer 5.

[0046] In order to be able to perform no-load detection on the reset situation of the buffer 5 after extrusion, the extrusion device of this embodiment mainly consists of an extrusion cylinder body 3, a second piston 31, a fourth spring 29, a second push rod 20, a fifth spring 34, a sealing baffle 35, a solenoid valve 33 and a return pipe 32. The extrusion cylinder body 3 is horizontally arranged, and its top surface is fixedly connected to the bottom of the connecting rod 21. The second piston 31 is slidably arranged in the extrusion cylinder body 3. One end of the fourth spring 29 is fixedly connected to the side surface of the second piston 31, and the other end is fixedly connected to the end of the extrusion cylinder body 3. The side surface of the second piston 31 away from the fourth spring 29 is fixedly connected to the second push rod 20. A pressure sensor 28 is embedded in the bottom surface of the second push rod 20, and the bottom surface of the second push rod 20 can be flush with the lower part of the push plate 27. In order to allow hydraulic oil to enter the extrusion cylinder body 3 to push the second piston 31, the connecting rod 21 is set as a hollow connecting rod 21 in this embodiment. Its top is communicated with the space above the sealing plate 26, and its bottom is communicated with the extrusion cylinder body 3. One end of the fifth spring 34 is fixed in the inner side wall of the connecting rod 21, and the other end is fixedly connected to the sealing baffle 35. The sealing baffle 35 is in close contact with the inner side wall of the extrusion cylinder body 3 under the pulling force of the fifth spring 34. The sealing baffle 35 and the fifth spring 34 are provided, and the elastic coefficient of the fifth spring 34 is greater than that of the third spring 30. In this way, under the hydraulic action, the hydraulic oil can first push the sealing plate 26 to move downward. When the piston rod of the buffer 5 is extruded to the maximum stroke position, the hydraulic oil pushes open the sealing baffle 35 under the pressurization of the hydraulic mechanism and enters the extrusion cylinder body 3, and then pushes the second piston 31 to extrude the fourth spring 29, so that the second push rod 20 enters the extrusion cylinder body 3. In this way, the reset duration of the buffer 5 when the second push rod 20 is separated from the buffer 5 can be accurately detected. Furthermore, its quality and service life can be evaluated.

[0047] In order to be able to better fix the buffer 5 and prevent the buffer 5 from being displaced due to extrusion, a ring cylinder 6 is fixedly installed on the bottom plate 7. During use, the buffer 5 is placed inside the ring cylinder 6. An annular oil storage cavity 15 is formed inside the ring cylinder 6. Four fixing mechanisms are horizontally arranged on the inner side wall of the ring cylinder 6. The four fixing mechanisms are as Figure 8The arc lengths are distributed in an equal-arc-length manner, etc., and the fixing mechanism is communicated with the oil storage cavity 15. The fixing mechanism mainly consists of a second fixing cylinder body 18, a second spring 19, a third push rod 16 and a clamping plate 17. The second fixing cylinder body 18 is horizontally arranged, and its end is communicated with the oil storage cavity 15. The second spring 19 is installed in the second fixing cylinder body 18. One end of the second spring 19 is fixedly connected to the end of the second fixing cylinder body, and the other end is fixedly connected to the end of the third push rod 16. The third push rod 16 is in sealing sliding contact with the inner side wall of the second fixing cylinder body 18. The end of the third push rod 16 away from the second spring 19 is fixedly connected to the clamping plate 17; in order to better fit with the buffer 5, the clamping plate 17 is made of an arc-shaped rubber plate. The oil storage cavity 15 is connected to the oil outlet end of the hydraulic mechanism. When hydraulic oil is pressurized into the oil storage cavity 15, the hydraulic oil flows into the second fixing cylinder body 18 and pushes the third push rod 16, so that the four clamping plates 17 fix the buffer 5. The greater the pressure of the hydraulic oil in the oil storage cavity 15, the greater the clamping force of the clamping plate 17 and the more reliable the fixation.

[0048] In this embodiment, the hydraulic mechanism mainly consists of an oil storage tank (not marked in the figure), a hydraulic pump 8, a connecting main pipe 9, a regulating valve and two connecting branch pipes 12. The hydraulic pump 8 and the oil storage tank are both fixed on the bottom plate 7. The liquid inlet end of the hydraulic pump 8 is connected to the oil storage tank, and the liquid outlet end is connected to the connecting main pipe 9 through the oil storage cavity 15. The top of the connecting main pipe 9 is connected to the regulating valve, and the two connecting branch pipes 12 are also connected to the regulating valve at the same time. One of the connecting branch pipes 12 is connected to the hydraulic tank 2 through a vertical telescopic pipe 10, and the other connecting branch pipe 12 is connected to the top of the first fixing cylinder body 13. With the above structural design of the hydraulic mechanism, when pressurizing the limiting mechanism and the extrusion device, the buffer 5 can be clamped and fixed at the same time, and the greater the pressurizing intensity, the better the fixing effect. In addition, when the hydraulic pump 8 stops pressurizing, the hydraulic oil flowing back from the hydraulic tank 2 also has a certain pressure, which can also make the third push rod 16 have a certain pressure and thus continuously clamp and fix the buffer 5 with a certain pressure.

[0049] In this embodiment, the regulating valve adopts as Figure 9Designed in the manner shown, it mainly consists of a spherical shell 11, a rotating sphere 37, and a stepping motor 36. The spherical shell 11 is connected to the connecting main pipe 9 and two connecting branch pipes 12 at the same time. The rotating sphere 37 is rotatably arranged inside the spherical shell 11. The output end of the stepping motor 36 is fixedly connected to the rotating sphere 37. An L-shaped channel 23 is opened inside the rotating sphere 37. One end of the L-shaped channel 23 is always in communication with the connecting main pipe 9, and the other end is a free end. When the stepping motor 36 drives the rotating sphere 37 to rotate, the free end of the L-shaped channel 23 can be respectively communicated with the two connecting branch pipes 12. When it is necessary for the hydraulic mechanism to push the push plate 27 to fit with the hydraulic rod of the buffer 5, the rotating sphere 37 rotates to make the connecting branch pipe 12 connected to the fixed cylinder body 13 communicate with the L-shaped channel 23. When it is necessary to squeeze the buffer 5, the rotating sphere 37 rotates to make the connecting branch pipe 12 connected to the telescopic pipe 10 communicate with the L-shaped channel 23. After the push plate 27 moves to the specified position, it is not necessary to turn off the hydraulic pump 8. Just let the L-shaped channel 23 change direction, and the extrusion device can be pushed. And after changing direction, the hydraulic oil in the fixed cylinder body 13 is in a sealed state, which can fix the push plate 27 at the specified position.

[0050] In this embodiment, a controller (not marked in the figure) is also provided, and the controller is used to control each electrical component.

[0051] Working principle: When using this device to detect the buffer 5, place the buffer 5 in the annular cylinder 6 with its piston rod facing upward. By controlling the stepping motor 36, make the connecting branch pipe 12 on the fixed cylinder body 13 communicate with the connecting main pipe 9. Then the hydraulic pump 8 pressurizes, so that the hydraulic oil enters the oil storage cavity 15 and the fixed cylinder body 13 in sequence, which not only clamps and fixes the buffer 5 by the clamping plate 17, but also pushes the push plate 27 to the specified position, making the push plate 27 fit with the piston rod of the buffer 5. When the pressure sensor 28 on the push plate 27 receives the specified pressure value, the stepping motor 36 drives the rotating sphere 37 to rotate, and the hydraulic pump 8 pumps the hydraulic oil above the sealing plate 26 and pushes the sealing plate 26 to move downward, thereby making the push rod two 20 of the extrusion device squeeze the buffer 5 downward. When the piston rod of the buffer 5 moves to the maximum stroke position, at this time the hydraulic pump 8 continues to pressurize, so that the hydraulic oil pushes open the sealing baffle 35 and enters the extrusion cylinder 3, and squeezes the spring four 29 by pushing the piston two 31, so that the push rod two 20 enters the extrusion cylinder 3. When the push rod two 20 separates from the piston rod of the buffer 5, record the reset situation of the buffer 5 at this time. At this time, the hydraulic pump 8 stops pressurizing, and the sealing plate 26 returns to the initial position under the elastic force of the spring three 30. After the push rod two 20 returns to the initial position, open the solenoid valve 33, and the hydraulic oil in the extrusion cylinder 3 enters the connecting rod 21 under the elastic force of the spring four 29, and the push rod two 20 returns to the initial position. Repeat the above operations to realize the life detection of the buffer 5 under no-load conditions.

[0052] This embodiment correspondingly provides a method for detecting the life of a buffer, and the specific steps are as follows:

[0053] S1: When pushing the push plate 27 to fit with the piston rod of the buffer 5, at this time, the pressure sensor 28 on the push plate receives the pressure value as the calibration value;

[0054] S2: When the second push rod 20 separates from the piston rod of the buffer 5, at this time, the pressure value of the pressure sensor 28 on the push rod is 0, and the controller records the moment when the pressure value becomes 0 as the 0 moment;

[0055] S3: When the pressure sensor 28 on the push plate 27 senses the pressure of the piston rod of the buffer 5 again, the controller records this moment and obtains the duration from the 0 moment to this moment; record this duration; at the same time, compare the pressure value received by the pressure sensor 28 with the pressure value in the initial state to observe whether the buffer 5 can return to the initial state;

[0056] S4: Repeat the operations of S1 - S3, record the recovery duration of the buffer 5 each time and the magnitude of the pressure value received by the push plate 27, and finally evaluate the anti-fatigue ability and service life of the buffer 5.

[0057] Embodiment 2: A buffer life detection device, as Figure 10 and Figure 11 shown. The main difference between this embodiment and Embodiment 1 lies in the different extrusion devices. The extrusion device in this embodiment is a horizontally arranged fourth push rod 22. The top surface of the fourth push rod 22 is directly connected to the corresponding connecting rod 21. The connecting rod 21 is a solid rod, and the sleeved third spring 30 is cancelled on the surface of the connecting rod 21. A pressure sensor 28 is also provided on the bottom surface of the fourth push rod 22. A flow sensor is provided at the liquid outlet end of the hydraulic pump 8 or on the main connecting pipe 9. This embodiment mainly conducts life detection on the buffer 5 under the condition of carrying a load.

[0058] Working principle: When the push plate 27 fits with the piston rod of the buffer 5 and has a certain pressure value, at this time, the sealing plate 26 is acted on by the hydraulic oil to make the fourth push rod 22 push the piston rod of the buffer 5. When the piston rod of the buffer 5 moves to the maximum stroke position, at this time, the hydraulic pump 8 cannot continue to pressurize, and the flow sensor senses that the flow rate of the hydraulic oil is 0, and at this time, the hydraulic pump 8 stops pressurizing. When the buffer 5 recovers, it pushes the fourth push rod 22 back to the initial position, and finally the piston rod of the buffer 5 fits with the push plate 27. Repeat the above operations to realize the life detection of the buffer 5 under the condition of carrying a load.

[0059] The method for detecting the life of a buffer correspondingly provided in this embodiment, the specific steps are as follows:

[0060] S1: When the pushing plate 27 is in contact with the piston rod of the buffer 5, the pressure sensor 28 on the pushing plate receives a pressure value as the calibration value at this time;

[0061] S2: When the controller receives a flow value of 0 from the flow sensor, the controller records this moment as the 0 moment;

[0062] S3: When the pressure sensor 28 on the pushing plate 27 senses the pressure of the piston rod of the buffer 5 again, the controller records this moment and calculates the time duration from the 0 moment to this moment; record this time duration; meanwhile, compare the pressure value received by the pressure sensor 28 with the pressure value in the initial state to observe whether the buffer 5 can return to the initial state;

[0063] S4: Repeat the operations of S1 - S3, record the recovery time duration of the buffer 5 and the magnitude of the pressure value received by the pushing plate 27 each time, and finally evaluate the anti - fatigue ability and service life of the buffer 5.

[0064] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A buffer life detection device, comprising a fixing bracket, characterized in that: A limiting mechanism for calibrating the initial state of the buffer (5) is fixedly installed on the top of the fixed bracket; a hydraulic box (2) is fixedly sleeved on the side wall of the limiting mechanism, a sealing plate (26) is provided in the hydraulic box (2) and slides along its height direction, and the sealing plate (26) is also slidably sleeved on the limiting mechanism; a plurality of connecting rods (21) are fixedly installed on the bottom of the sealing plate (26), the bottoms of the plurality of connecting rods (21) pass through the hydraulic box (2) and are respectively connected to extrusion devices, the bottoms of the extrusion devices and the bottom of the limiting mechanism are both embedded with pressure sensors (28), and in the initial state, the bottom of the extrusion device is flush with the bottom of the limiting mechanism; A hydraulic mechanism is provided on the fixed bracket, the inlet and outlet ends of the hydraulic mechanism are connected to a telescopic tube (10), and the end of the telescopic tube (10) is fixedly connected to the top of the hydraulic box (2) and is internally communicated; An annular cylinder (6) is installed at the bottom of the fixed bracket, and a plurality of fixing mechanisms are installed on the inner wall of the annular cylinder (6), and the fixing mechanisms are used to fix the buffer (5); The limiting mechanism comprises a fixed cylinder (13), a spring (24), a piston (25), a push rod (14) and a push plate (27); the fixed cylinder (13) is vertically mounted on the top of the fixed bracket, the spring (24) is fixedly mounted in the fixed cylinder (13), the top of the spring (24) is fixedly connected to the top of the fixed cylinder (13), the bottom of the spring (24) is fixedly connected to the piston (25), the piston (25) is in sliding contact with the fixed cylinder (13); the bottom of the piston (25) is fixedly connected to the top of the push rod (14), the bottom of the push rod (14) is fixedly connected to the top surface of the push plate (27), and the pressure sensor (28) is embedded in the bottom surface of the push plate (27); the top of the fixed cylinder (13) is connected to the hydraulic mechanism; The extrusion device comprises an extrusion cylinder (3), a spring four (29), a piston two (31), a push rod two (20), a return pipe (32), a solenoid valve (33) and an elastic one-way valve; the connecting rod (21) is a hollow rod, the top of the connecting rod (21) is connected to the space above the sealing plate (26) in the hydraulic box (2), the bottom of the connecting rod (21) is connected to the extrusion cylinder (3), the outer wall of the connecting rod (21) is sleeved with a spring three (30), and the two ends of the spring three (30) are respectively fixedly connected to the sealing plate (26) and the bottom of the hydraulic box (2); the elastic one-way valve is installed at the connection between the extrusion cylinder (3) and the connecting rod (21), the piston two (31) is connected to the sealing plate (26) and the bottom of the hydraulic box (2) The seal is slidably arranged on the inner wall of the extrusion cylinder (3); the two ends of the spring four (29) are respectively fixedly connected to the piston two (31) and the end of the extrusion cylinder (3); the end of the push rod two (20) is fixedly connected to the side wall of the piston two (31) away from the spring four (29), and the end of the push rod two (20) away from the piston two (31) is located outside the pressurizing cylinder; the pressure sensor (28) is embedded in the bottom surface of the push rod two (20), and in the initial state, the bottom surface of the push rod two (20) is flush with the bottom surface of the limit mechanism; the two ends of the return pipe (32) are respectively connected to the extrusion cylinder (3) and the connecting rod (21), and the solenoid valve (33) is installed on the return pipe (32); The elastic one-way valve comprises a spring five (34) and a sealing baffle (35), one end of the spring five (34) is fixedly connected to the inner wall of the connecting rod (21), and the other end is fixedly connected to the top surface of the sealing baffle (35). In the initial state, the top surface of the sealing baffle (35) contacts the inner wall of the extrusion cylinder (3).

2. A buffer life detection device according to claim 1, characterized in that: The hydraulic mechanism comprises an oil storage tank, a hydraulic pump (8), a connecting main pipe (9), a regulating valve and two connecting branch pipes (12); the liquid inlet end of the hydraulic pump (8) is connected to the oil storage tank, and the two ends of the connecting main pipe (9) are respectively connected to the liquid outlet end of the hydraulic pump (8) and the regulating valve; one end of the two connecting branch pipes (12) is simultaneously connected to the regulating valve, and the other ends are respectively connected to the telescopic pipe (10) and the limit mechanism.

3. A buffer life detection device according to claim 2, characterized in that: The regulating valve comprises a spherical shell (11), a rotating ball (37) and a stepping motor (36); the spherical shell (11) is connected to a connecting main pipe (9) and two connecting branch pipes (12) at the same time; the rotating ball (37) is rotatably arranged in the spherical shell (11); the output end of the stepping motor (36) is fixedly connected to the rotating ball (37); an L-shaped channel (23) is opened in the rotating ball (37); one end of the L-shaped channel (23) is connected to the connecting main pipe (9) and the other end is a free end and can be connected to the two connecting branch pipes (12) respectively.

4. A buffer life detection device according to claim 1, characterized in that: The fixing mechanism comprises a second fixing cylinder (18), a second spring (19), a third push rod (16) and a clamping plate (17); one end of the second fixing cylinder (18) is fixedly mounted on the inner wall of the annular cylinder (6), the second spring (19) is mounted inside the second fixing cylinder (18), one end of the second spring (19) is fixedly connected to the end of the fixing cylinder, and the other end is fixedly connected to the end of the third push rod (16), the third push rod (16) is in sealing sliding contact with the inner wall of the second fixing cylinder (18), and the end of the third push rod (16) away from the second spring (19) is fixedly connected to the clamping plate (17); an oil storage chamber (15) is opened in the annular cylinder (6), and a plurality of second fixing cylinders (18) are all connected to the oil storage chamber (15); and the hydraulic mechanism is connected to the oil storage chamber (15).

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