Push rod rigidity detection mechanism

Abstract

The utility model discloses a push rod rigidity detection mechanism, which belongs to the technical field of push rod testing, solves the problem of inconvenience in testing in the prior art, and adopts the technical scheme that the push rod rigidity detection mechanism comprises a linear driving mechanism and a grating ruler for detecting the displacement of a detected push rod, the tested push rod is provided with a first positioning hole located in an outer pipe of the tested push rod and a second positioning hole located in an inner pipe of the tested push rod, the testing platform is further provided with a first positioning piece and a second positioning piece, and the first positioning piece is used for being inserted into the first positioning hole to lock the outer pipe of the tested push rod on the testing platform. The second positioning piece is used for being inserted into the second positioning hole to lock the inner tube of the tested push rod on the test platform, and the second positioning piece is movably arranged on the test platform and can be driven by the linear driving mechanism to move on the test platform, so that the second positioning piece is aligned with the second positioning hole; and the output end of the linear driving mechanism is connected with the inner pipe through a second positioning piece. According to the utility model, the test is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of push rod testing technology, and in particular to a push rod rigidity testing mechanism. Background Technology

[0002] As a drive device that converts the rotary motion of a motor into linear reciprocating motion, a push rod can apply pushing or pulling forces to a load to complete actions such as lifting and lowering. The key to its performance lies in its rigidity, that is, its ability to resist deformation under load. Existing push rods typically consist of an inner tube and an outer tube: the outer tube provides support and protection for the inner tube and fixes the push rod in the installation position through a first positioning hole; the inner tube is used to transmit pushing and pulling forces to the load end, and usually has a second positioning hole (fisheye connector) to connect to the load end.

[0003] In existing technologies for testing the rigidity of push rods, the outer tube must first be fixed, and then the inner tube is connected to a linear drive mechanism. The inner tube is pushed and pulled by the linear drive mechanism, and the displacement of the push rod under test is measured using a grating ruler to obtain its rigidity. However, this testing method has significant shortcomings: during rigidity testing, the position of the inner tube relative to the outer tube is not fixed, which causes the position of the second positioning hole relative to the first positioning hole to change. During testing, the positioning component of the first positioning hole is fixed, but when connecting the second positioning hole to the linear drive mechanism, the linear drive mechanism needs to be manually adjusted back and forth multiple times, and the pin needs to be manually inserted into the pin hole. This makes the entire operation cumbersome and the testing extremely inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a push rod rigidity detection mechanism, which solves the problem of inconvenient testing in the prior art and makes testing more convenient.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a push rod rigidity detection mechanism, comprising a test platform and a linear drive mechanism for pushing and pulling the push rod under test, and a grating ruler for detecting the displacement of the push rod under test. The push rod under test is provided with a first positioning hole on the outer tube of the push rod under test and a second positioning hole on the inner tube of the push rod under test. The test platform is also provided with a first positioning member and a second positioning member. The first positioning member is used to insert into the first positioning hole to lock the outer tube of the push rod under test on the test platform. The second positioning member is used to insert into the second positioning hole to lock the inner tube of the push rod under test on the test platform. The second positioning member is movably disposed on the test platform and can move along the axial direction of the push rod under test on the test platform under the drive of the linear drive mechanism, so that the second positioning member is aligned with the second positioning hole. The output end of the linear drive mechanism is connected to the inner tube through the second positioning member.

[0006] After adopting the above technical solution, this utility model has the following advantages: The outer tube of the push rod under test is fixed by a first positioning member set on the test platform, and a first positioning hole is located on the outer tube of the push rod. The outer tube is locked by inserting the first positioning member, simulating the installation conditions in actual use. Simultaneously, a second positioning hole is located on the inner tube of the push rod, and is connected to the linear drive mechanism through a second positioning member movably set on the test platform. When the position of the inner tube changes, the second positioning member can move along the axial direction of the push rod under the drive of the linear drive mechanism on the test platform, automatically adjusting to the position aligned with the second positioning hole. This eliminates the need for manually finding and aligning the second positioning hole, eliminates the need to move the linear drive mechanism multiple times, simplifies the operation process, and makes testing more convenient and faster. Furthermore, since the outer tube remains fixed, the behavior of the inner tube during the push-pull process is closer to the real working conditions, improving the reliability and accuracy of the test data.

[0007] Furthermore, the linear drive mechanism includes a pressure head that can abut against the inner tube of the push rod being measured. The output end of the linear drive mechanism and the pressure head are floatingly connected through an elastic structure. The pressure head and the second positioning member are connected as a whole.

[0008] By employing the aforementioned technical solution, the elastic structure enables a floating connection between the output end of the linear drive mechanism and the pressure head, thus eliminating the completely rigid contact between the pressure head and the inner tube of the tested push rod. During the pushing and pulling process of the inner tube by the linear drive mechanism, the elastic structure effectively absorbs instantaneous impact forces, avoiding stress concentration caused by rigid contact. This minimizes the risk of deformation or damage to the inner tube due to excessive force, improving the safety and stability of the testing process. Simultaneously, the pressure head and the second positioning component are integrated, and the elastic structure allows the pressure head to float within a certain range, which in turn allows the second positioning component to float accordingly. This automatically compensates for minor misalignment or installation errors between the second positioning component and the second positioning hole on the inner tube, ensuring precise alignment during testing.

[0009] Furthermore, the elastic structure includes a floating joint, a floating sleeve, and a spring disposed within the floating sleeve. The floating sleeve and the second positioning member are fixedly connected. One end of the floating joint is connected to the output end of the linear drive mechanism, and the other end of the floating joint abuts against the spring. When the output end of the linear drive mechanism pushes the floating joint, it can compress the spring. The other end of the spring abuts against the pressure head, applying a pressing force pointing towards the push rod being tested to the pressure head, so that the pressure head abuts against the inner tube of the push rod being tested.

[0010] Using the aforementioned technical solution, the spring is located inside the floating sleeve and connected to the output end of the linear drive mechanism through a floating joint. During the pushing process, the spring can be compressed to absorb the instantaneous impact force in the pushing and pulling action. It also realizes a floating connection between the output end of the linear drive mechanism and the inner tube of the push rod being tested. The spring applies a continuous pressing force to the pressure head pointing towards the inner tube of the push rod being tested, so that the pressure head always stably fits against the end face of the inner tube, ensuring reliable power transmission.

[0011] Furthermore, the floating sleeve includes a receiving cavity for accommodating the spring, and one end of the floating joint extending into the receiving cavity protrudes radially outward to form a snap-fit ​​step. The snap-fit ​​step of the floating joint is slidably placed in the receiving cavity. A limiting step is provided at one end of the receiving cavity near the output end of the linear drive mechanism. The linear drive mechanism pulls the floating joint to make the snap-fit ​​step and the limiting step abut against each other, thereby pulling the inner tube of the push rod being tested.

[0012] Using the aforementioned technical solution, when the linear drive mechanism pushes the spring through the floating joint, the spring transmits the thrust to the inner tube through the pressure head, thus realizing the inner tube thrust test. The setting of the limiting step ensures that when the linear drive mechanism applies tension, the locking step and the limiting step are in close contact, so that the tension of the linear drive mechanism can be effectively and smoothly transmitted to the inner tube of the push rod under test, thus realizing the inner tube tension test.

[0013] Furthermore, the floating joint and the output end of the linear drive mechanism are fixedly connected.

[0014] By adopting the aforementioned technical solution, the fixed connection means that there is no intermediate link to absorb or disperse the force. Whether the push rod under test is pulled or pushed, the force output from the linear drive mechanism can be transmitted to the floating joint with almost no loss, making the test results more reliable.

[0015] Furthermore, the floating sleeve is provided with a sensing element that can sense the position of the floating joint. The sensing element is electrically connected to the linear drive mechanism. When the floating joint moves to the set position and triggers the sensing element, the linear drive mechanism stops running.

[0016] With the above technical solution, the position of the second positioning hole on the inner tube is fixed. When the floating joint moves to the set position, the pressure head is stably pressed against the inner tube. Correspondingly, the second positioning component is aligned with the second positioning hole. By setting a sensing element, the sensing element monitors the position of the floating joint in real time. When the floating joint moves to the set position, the linear drive mechanism automatically stops, making the operation of the linear drive mechanism clear and ensuring that the second positioning component is aligned with the second positioning hole as much as possible.

[0017] Furthermore, the test platform is also provided with a linear guide rail extending along the push-pull direction of the linear drive mechanism, and a slider is provided on the linear guide rail, with the floating sleeve and / or the second positioning member mounted on the slider.

[0018] Through the above technical solution, the combination of linear guide rail and slider provides linear motion guidance, ensuring that the floating sleeve and the second positioning component can move smoothly along the predetermined trajectory during the push-pull process, thereby achieving the requirement of accurate alignment of the second positioning hole and a smoother push-pull test of the inner tube.

[0019] Furthermore, the pressure head includes a rigid pressing part and a flexible pressing part, wherein the rigid pressing part abuts against the spring and flexibly abuts against the inner tube of the push rod being tested through the flexible pressing part.

[0020] Through the above technical solution, due to the characteristics of rigid materials, the magnitude and direction of the force can remain relatively stable during the force transmission process. The force will not be lost or deviated due to its own deformation. The rigid pressing part abuts against the spring, which can accurately transmit the spring force to the flexible pressing part. When the rigid pressing part transmits force, the flexible pressing part can buffer the instantaneous impact force through its own elastic deformation. The flexible pressing part can automatically adjust the contact surface according to the inner tube of different shapes and sizes, which enhances the adaptability of the pressure head to various specifications of push rods. It can also adapt to the slight unevenness of the inner tube surface, making the applied pressure more uniform.

[0021] Furthermore, both the first and second positioning components include a positioning seat, a positioning shaft, and a driving cylinder. The output shaft of the driving cylinder is fixedly connected to the positioning shaft. The positioning seat is provided with a fixing hole. When the fixing hole is aligned with the first positioning hole or the second positioning hole, the positioning shaft is driven by the driving cylinder to pass through the fixing hole and the first connecting hole or through the fixing hole and the second connecting hole to fix the outer tube or inner tube of the push rod to be tested on the positioning seat.

[0022] The above technical solution controls the movement of the positioning shaft by driving the cylinder, enabling the positioning shaft to pass through the fixing hole and the corresponding first or second positioning hole, thereby achieving the fixing of the outer tube and the inner tube.

[0023] Furthermore, the drive cylinder of the second positioning member is arranged below the positioning seat of the second positioning member, the positioning shaft of the second positioning member and the output shaft of the drive cylinder of the second positioning member are arranged side by side, and the second positioning member also includes a synchronization plate connecting the positioning shaft of the second positioning member and the output shaft of the second drive cylinder of the second positioning member.

[0024] The above technical solution arranges the drive cylinder on the side of the positioning seat, with the positioning shaft and the output shaft of the drive cylinder arranged side by side. The synchronous plate provides a smooth power transmission path, shortens the axial dimension of the equipment, and makes the equipment layout more compact and reasonable, effectively utilizing the limited space. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the push rod rigidity detection mechanism of this utility model;

[0027] Figure 2 For the present utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0028] Figure 3 This is a cross-sectional view of the push rod rigidity detection mechanism of this utility model;

[0029] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point B;

[0030] Figure 5 This is a cross-sectional view of the push rod rigidity detection mechanism of this utility model located at the first positioning component;

[0031] Figure 6 This is a cross-sectional view of the push rod rigidity detection mechanism of this utility model located at the second positioning component;

[0032] In the diagram, 10 is the push rod; 11 is the outer tube; 111 is the first positioning hole; 12 is the inner tube; 121 is the second positioning hole; 20 is the grating ruler; 30 is the first positioning component; 31 is the first positioning seat; 32 is the first positioning shaft; 33 is the first drive cylinder; 34 is the first fixing hole; 35 is the U-shaped groove; 36 is the connecting protrusion; 40 is the second positioning component; 41 is the second positioning seat; 42 is the second positioning shaft; 43 is the second drive cylinder; and 44 is the second fixing hole. 45. Hole; 46. U-shaped part; 50. Synchronous plate; 51. Linear drive mechanism; 51. Press head; 511. Rigid pressing part; 512. Flexible pressing part; 513. Connecting shaft; 52. Floating joint; 521. Snap-fit ​​step; 522. Sensing column; 53. Floating sleeve; 531. Receiving cavity; 532. Limiting step; 533. Opening; 54. Spring; 55. Sensing element; 60. Linear guide rail; 61. Slider; 70. Pressure sensor. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0034] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein.

[0035] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0036] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0037] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0038] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0039] like Figures 1 to 5As shown, this utility model provides a push rod rigidity detection mechanism, including a test platform and a linear drive mechanism 50 for pushing and pulling the push rod 10 under test, and a grating ruler 20 for detecting the displacement of the push rod 10 under test. The push rod 10 under test is provided with a first positioning hole 111 on the outer tube 11 of the push rod 10 under test, and a second positioning hole 121 on the inner tube 12 of the push rod 10 under test. The test platform is also provided with a first positioning member 30 and a second positioning member 40. The first positioning member 30 is used to insert into the first positioning hole 111 to lock the outer tube 11 of the push rod 10 under test on the test platform. The second positioning member 40 is used to insert into the second positioning hole 121 to lock the inner tube 12 of the push rod 10 under test on the test platform. The second positioning member 40 is movably disposed on the test platform and can move along the axial direction of the push rod 10 under test on the test platform under the drive of the linear drive mechanism 50 so that the second positioning member 40 is aligned with the second positioning hole 121. The output end of the linear drive mechanism 50 is connected to the inner tube 12 through the second positioning member 40.

[0040] The outer tube 11 of the push rod 10 under test is fixed by the first positioning member 30 set on the test platform. The first positioning hole 111 is set on the outer tube 11 of the push rod 10. The outer tube 11 is locked by inserting the first positioning member 30 to simulate the installation conditions in actual use. At the same time, the second positioning hole 121 is set on the inner tube 12 of the push rod 10 and is connected to the linear drive mechanism 50 by the second positioning member 40 movably set on the test platform. When the position of the inner tube 12 changes, the second positioning member 40 can move along the axial direction of the push rod 10 under the drive of the linear drive mechanism 50 on the test platform and automatically adjust to the position aligned with the second positioning hole 121. This eliminates the need to manually find and align the second positioning hole 121 and eliminates the need to move the linear drive mechanism 50 multiple times, simplifying the operation process and making the test more convenient and faster. Since the outer tube 11 always remains fixed, the behavior of the inner tube 12 during the push-pull process is closer to the real working condition, which improves the reliability and accuracy of the test data.

[0041] Because the linear drive mechanism 50 generates a large impact force, it can easily damage the push rod 10 under test. Therefore, in this application, the linear drive mechanism 50 includes a pressure head 51 that can abut against the inner tube 12 of the push rod 10 under test. The output end of the linear drive mechanism 50 and the pressure head 51 are floatingly connected through an elastic structure, realizing a floating connection between the output end of the linear drive mechanism 50 and the pressure head 51. This means that the contact between the pressure head 51 and the inner tube 12 of the push rod 10 under test is no longer completely rigid. During the process of the linear drive mechanism 50 pushing and pulling the inner tube 12, the elastic structure can effectively absorb the instantaneous impact force, avoiding stress concentration caused by rigid contact. This minimizes the risk of deformation or damage to the inner tube 12 due to excessive force, improving the safety and stability of the testing process. Meanwhile, the pressure head 51 is connected to the second positioning member 40 as a whole. The elastic structure allows the pressure head 51 to float within a certain range, which also allows the second positioning member 40 to float accordingly. This can automatically compensate for minor misalignment or installation errors between the second positioning member 40 and the second positioning hole 121 on the inner tube 12, ensuring that the two can achieve precise alignment during the test.

[0042] Specifically, the elastic structure includes a floating joint 52, a floating sleeve 53, and a spring 54 disposed within the floating sleeve 53. The floating sleeve 53 is fixedly connected to the second positioning member 40. One end of the floating joint 52 is connected to the output end of the linear drive mechanism 50, and the other end of the floating joint 52 abuts against the spring 54. When the output end of the linear drive mechanism 50 pushes the floating joint 52, it can compress the spring 54. The spring 54 absorbs the instantaneous impact force during the push-pull action. The other end of the spring 54 abuts against the pressure head 51, applying a pressing force to the pressure head 51 pointing towards the push rod 10 under test, so that the pressure head 51 abuts against the inner tube 12 of the push rod 10 under test, ensuring reliable power transmission.

[0043] Due to the properties of rigid materials, the magnitude and direction of force remain relatively stable during force transmission, without force loss or deviation due to deformation. Furthermore, the pressure head 51 includes a rigid pressing part 511 and a flexible pressing part 512. The rigid pressing part 511 abuts against the spring 54 and flexibly abuts against the inner tube 12 of the push rod 10 being measured via the flexible pressing part 512. The rigid pressing part 511 abuts against the spring 54, accurately transmitting the spring force to the flexible pressing part 512. When the rigid pressing part 511 transmits force, the flexible pressing part 512 can buffer the instantaneous impact force through its own elastic deformation. The flexible pressing part 512 can automatically adjust the contact surface according to the different shapes and sizes of the inner tube 12, enhancing the adaptability of the pressure head 51 to various specifications of push rods 10 and adapting to minor unevenness on the surface of the inner tube 12, resulting in more uniform applied pressure. A connecting shaft 513 is provided between the rigid pressing part 511 and the flexible pressing part 512, arranged along the axial direction of the push rod 10 being measured. A pressure sensor 70 is provided on the connecting shaft 513, preferably a strain gauge pressure sensor. The strain gauge pressure sensor includes an elastic element, a resistance strain gauge, and a measuring bridge circuit. The resistance strain gauge is attached to the elastic element. When the power output by the linear drive mechanism 50 is transmitted to the inner tube 12 through the connecting shaft 513, the power transmitted by the connecting shaft 513 acts on the elastic element, causing the resistance strain gauge to deform and its resistance value to change. Based on the change in the resistance value of the resistance strain gauge, it can be converted into an electrical signal by the measuring bridge circuit for measurement to obtain the pushing and pulling force of the linear drive mechanism 50 on the inner tube 12.

[0044] It should be noted that the output end of the linear drive mechanism 50 moves along the axial direction of the push rod 10 being measured, the pressure head 51 abuts against the end of the inner tube 12, the second positioning hole 121 is arranged radially through the inner tube 12, and the second positioning member 40 is located on the side of the inner tube 12. When the second positioning member 40 is aligned with the second positioning hole 121, the second positioning member 40 can be inserted into the second positioning hole 121 from the side.

[0045] To make the test smoother, the test platform is also equipped with a linear guide rail 60 extending along the push-pull direction of the linear drive mechanism 50. A slider 61 is provided on the linear guide rail 60, and the floating sleeve 53 is installed on the slider 61. The combination of the linear guide rail 60 and the slider 61 provides linear motion guidance, ensuring that the floating sleeve 53 and the second positioning component 40 can move smoothly along the predetermined trajectory during the push-pull process, thereby achieving the requirement of accurate alignment of the second positioning hole 121 and a smoother push-pull test of the inner tube 12.

[0046] Understandably, in other embodiments, the second positioning element 40 is directly mounted on the slider 61, and the floating sleeve 53 is not mounted on the slider 61. Alternatively, both the second positioning element 40 and the floating sleeve 53 can be mounted on the slider 61 simultaneously to make their movement smoother.

[0047] The floating sleeve 53 includes a receiving cavity 531 for accommodating the spring 54. One end of the floating joint 52 extends into the receiving cavity 531 and protrudes radially outward to form a snap-fit ​​step 521. The snap-fit ​​step 521 of the floating joint 52 is slidably placed in the receiving cavity 531. A limiting step 532 is provided at one end of the receiving cavity 531 near the output end of the linear drive mechanism 50. The linear drive mechanism 50 pulls the floating joint 52 so that the snap-fit ​​step 521 and the limiting step 532 abut against each other, thereby pulling the inner tube 12 of the push rod 10 being tested. When the linear drive mechanism 50 pushes the spring 54 through the floating joint 52, the spring 54 transmits the thrust to the inner tube 12 through the pressure head 51, realizing the thrust test of the inner tube 12. The setting of the limiting step 532 ensures that when the linear drive mechanism 50 applies tension, the locking step 521 and the limiting step 532 are in close contact, so that the tension of the linear drive mechanism 50 can be effectively and smoothly transmitted to the inner tube 12 of the push rod 10 under test, realizing the tension test of the inner tube 12.

[0048] The position of the second positioning hole 121 on the inner tube 12 is fixed. When the floating joint 52 moves to the set position, the pressure head 51 is stably pressed against the inner tube 12. Correspondingly, the second positioning member 40 is aligned with the second positioning hole 121. In order to make the movement amount of the linear drive mechanism 50 clear, in this application, the floating sleeve 53 is provided with a sensing element 55 that can sense the position of the floating joint 52. The sensing element 55 is electrically connected to the linear drive mechanism 50. When the floating joint 52 moves to the set position and triggers the sensing element 55, the linear drive mechanism 50 stops running, making the operation of the linear drive mechanism 50 clear and ensuring that the second positioning member 40 is aligned with the second positioning hole 121 as much as possible.

[0049] To facilitate sensing the position of the floating connector 52, a sensing post 522 is fixedly connected to the floating connector 52. The floating sleeve 53 has an opening 533 through which the sensing post 522 passes. The sensing element 55 senses the position of the floating connector 52 by sensing the sensing post 522. The sensing element 55 can be a proximity switch.

[0050] The floating joint 52 and the output end of the linear drive mechanism 50 are fixedly connected. The fixed connection means that there is no intermediate link to absorb or disperse the force. Whether the push rod 10 under test is pulled or pushed, the force output from the linear drive mechanism 50 can be transmitted to the floating joint 52 with almost no loss, making the test results more reliable.

[0051] Furthermore, the first positioning component 30 includes a first positioning seat 31, a first positioning shaft 32, and a first driving cylinder 33. The first positioning seat 31 is provided with a U-shaped groove 35. The output shaft of the first driving cylinder 33 is fixedly connected to the first positioning shaft 32. The first positioning seat 31 is provided with a first fixing hole 34. During assembly, the outer tube 11 is placed in the U-shaped groove 35. When the first fixing hole 34 and the first positioning hole 111 are visually observed to be aligned, the first driving cylinder 33 is operated. The first positioning shaft 32 is driven by the first driving cylinder 33 to pass through the first fixing hole 34 and the first positioning hole 111, so as to fix the outer tube 11 of the push rod 10 to the first positioning seat 31. Since the inner tube 12 is set inside the outer tube 11, and the first positioning holes 111 are respectively set on both sides of the outer tube 11 and are not connected to each other, two opposing first positioning components 30 are provided to fix the two sides of the outer tube 11, making the fixation of the outer tube 11 more reliable. Since the diameter of the first positioning shaft 32 is relatively small, the front end of the first positioning shaft 32 may be provided with a connecting protrusion 36 that engages with the first positioning hole 111. The connecting protrusion 36 may be provided with a larger diameter to fit the first positioning hole 111, so that the outer tube 11 can be effectively positioned and the movement of the outer tube 11 when the inner tube 12 is pulled or squeezed by the linear drive mechanism 50 may affect the test results.

[0052] The second positioning component 40 includes a second positioning seat 41, a second positioning shaft 42, and a second driving cylinder 43. The output shaft of the second driving cylinder 43 is fixedly connected to the second positioning shaft 42. The second positioning seat 41 is provided with a second fixing hole 44. When the second fixing hole 44 is aligned with the second positioning hole 121, the second positioning shaft 42 is driven by the second driving cylinder 43 to pass through the fourth connecting hole and the second connecting hole to fix the inner tube 12 of the push rod 10 to the second positioning seat 41. The second positioning seat 41 has a U-shaped part 45. The flexible pressing part 512 is located at the center of the bend of the U-shaped part 45. The middle position of the U-shaped part 45 can be used for the insertion of the inner tube 12. Two second fixing holes 44 can be provided on both sides of the U-shaped part 45. The second positioning shaft 42 passes through the second fixing hole 44 on one side, then through the second positioning hole 121, and finally enters the second fixing hole 44 on the other side to fix the inner tube 12.

[0053] The alignment of the second positioning element 40 with the second positioning hole 121 mentioned above refers to the second positioning shaft 42 and the second positioning hole 121 being coaxial.

[0054] To make the structure more compact, the second drive cylinder 43 is arranged below the second positioning seat 41, and the output shafts of the second positioning shaft 42 and the second drive cylinder 43 are arranged side by side. The second positioning component 40 also includes a synchronization plate 46 connecting the output shafts of the second positioning shaft 42 and the second drive cylinder 43, which shortens the axial dimension of the equipment, making the equipment layout more compact and reasonable, and effectively utilizing the limited space.

[0055] Working process: The push rod 10 is moved to the test platform by a robotic arm or manual gripper; then the first drive cylinder 33 extends, and the first positioning shaft 32 is inserted into the first positioning hole 111 to fix the outer tube 11; then the output end of the linear drive mechanism 50 extends, and the floating joint 52 moves forward synchronously with the output end of the linear drive mechanism 50. The spring 54 at the front end of the floating joint 52 pushes the pressure head 51 to contact the end of the inner tube 12 (fisheye joint), the pressure head 51 stops moving forward, the output end of the linear drive mechanism 50 continues to extend, the spring 54 is compressed, and when the proximity switch senses the sensing post 522 on the floating joint 52, the linear drive mechanism 50 stops moving; then, the second drive cylinder 43 starts, and the second positioning shaft 42 is inserted into the second positioning hole 121 of the inner tube 12 to fix the inner tube 12; then the robotic arm or manual gripper releases the push rod 10; then, the output end of the linear drive mechanism 50 moves backward, with a... A certain pulling force is applied to the inner tube 12 and maintained for a period of time, and the current position of the grating ruler 20 is recorded. Then, the output end of the linear drive mechanism 50 moves forward and applies a certain pushing force to the inner tube 12 and maintains it for a period of time, and the current position of the grating ruler 20 is recorded. Next, the position difference of the grating ruler 20 under the action of the pushing force and the pulling force is calculated to complete the rigidity detection of the push rod 10. Then, the output end of the linear drive mechanism 50 moves backward. When the proximity switch detects the sensing column 522, the output end of the linear drive mechanism 50 stops moving. At this time, the second positioning shaft 42 and the second positioning hole 121 are coaxial. Finally, the robot or a person picks up the push rod 10 after the test is completed. The second drive cylinder 43 drives the second positioning shaft 42 to disengage from the second positioning hole 121. At the same time, the first drive cylinder 33 drives the first positioning shaft 32 to disengage from the first positioning hole 111. The robot or a person takes the push rod 10 away from the test platform.

[0056] It should be noted that the grating ruler 20 includes a scale grating and an indicator grating. The scale grating is fixedly installed along the direction of movement of the push rod 10 being measured, and the indicator grating is connected to the push rod 10 being measured to ensure that it moves together with the push rod 10. When the push rod 10 being measured is displaced under the action of an external force, the indicator grating is displaced relative to the scale grating, causing a change in the moiré fringes. This change is captured by the grating ruler 20 in real time and converted into an electrical signal, which is then processed to obtain the exact displacement of the push rod 10 being measured.

[0057] It should be noted that the linear drive mechanism 50 can be a hydraulic cylinder. The operation of a hydraulic cylinder is relatively smooth, making the test more stable.

[0058] Understandably, in other embodiments, the output end of the linear drive mechanism can also be directly rigidly connected to the pressure head. Direct rigid connection means that there is no intermediate link to absorb or disperse force, which simplifies the structure. Therefore, the force output from the linear drive mechanism can be transmitted to the pressure head with almost no loss, and correspondingly to the push rod under test, which more realistically simulates the real use situation, thereby obtaining the performance of the push rod under test more realistically and accurately.

[0059] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A push rod rigidity testing mechanism, comprising a testing platform and a linear drive mechanism for pushing and pulling a push rod under test, and a grating ruler for detecting the displacement of the push rod under test, wherein the push rod under test has a first positioning hole on its outer tube and a second positioning hole on its inner tube, characterized in that, The test platform is also provided with a first positioning component and a second positioning component. The first positioning component is used to insert into the first positioning hole to lock the outer tube of the push rod under test on the test platform. The second positioning component is used to insert into the second positioning hole to lock the inner tube of the push rod under test on the test platform. The second positioning component is movably set on the test platform and can move along the axial direction of the push rod under test on the test platform under the drive of the linear drive mechanism so that the second positioning component is aligned with the second positioning hole. The output end of the linear drive mechanism is connected to the inner tube through the second positioning component.

2. The push rod rigidity detection mechanism according to claim 1, characterized in that, The linear drive mechanism includes a pressure head that can abut against the inner tube of the push rod being measured. The output end of the linear drive mechanism and the pressure head are floatingly connected through an elastic structure. The pressure head and the second positioning member are connected as one unit.

3. The push rod rigidity detection mechanism according to claim 2, characterized in that, The elastic structure includes a floating joint, a floating sleeve, and a spring disposed within the floating sleeve. The floating sleeve and the second positioning member are fixedly connected. One end of the floating joint is connected to the output end of the linear drive mechanism, and the other end of the floating joint abuts against the spring. When the output end of the linear drive mechanism pushes the floating joint, it can compress the spring. The other end of the spring abuts against the pressure head, applying a pressing force pointing towards the push rod being tested to the pressure head, so that the pressure head abuts against the inner tube of the push rod being tested.

4. The push rod rigidity detection mechanism according to claim 3, characterized in that, The floating sleeve includes a receiving cavity for accommodating the spring. One end of the floating joint extends into the receiving cavity and protrudes radially outward to form a snap-fit ​​step. The snap-fit ​​step of the floating joint is slidably placed in the receiving cavity. A limiting step is provided at one end of the receiving cavity near the output end of the linear drive mechanism. The linear drive mechanism pulls the floating joint to make the snap-fit ​​step and the limiting step abut against each other, thereby pulling the inner tube of the push rod being tested.

5. The push rod rigidity detection mechanism according to claim 3, characterized in that, The floating joint and the output end of the linear drive mechanism are fixedly connected.

6. The push rod rigidity detection mechanism according to claim 3, characterized in that, The floating sleeve is equipped with a sensing element that can detect the position of the floating joint. The sensing element is electrically connected to the linear drive mechanism. When the floating joint moves to the set position and triggers the sensing element, the linear drive mechanism stops running.

7. The push rod rigidity detection mechanism according to claim 3, characterized in that, The test platform is also provided with a linear guide rail extending along the push-pull direction of the linear drive mechanism, and a slider is provided on the linear guide rail. The floating sleeve and / or the second positioning member are installed on the slider.

8. The push rod rigidity detection mechanism according to claim 3, characterized in that, The pressure head includes a rigid pressing part and a flexible pressing part. The rigid pressing part abuts against the spring and flexibly abuts against the inner tube of the push rod being tested through the flexible pressing part.

9. The push rod rigidity detection mechanism according to claim 1, characterized in that, The first positioning component and the second positioning component both include a positioning seat, a positioning shaft and a driving cylinder. The output shaft of the driving cylinder and the positioning shaft are fixedly connected. The positioning seat is provided with a fixing hole. When the fixing hole is aligned with the first positioning hole or the second positioning hole, the positioning shaft is driven by the driving cylinder to pass through the fixing hole and the first connecting hole or through the fixing hole and the second connecting hole, so as to fix the outer tube or inner tube of the push rod to be tested on the positioning seat.

10. The push rod rigidity detection mechanism according to claim 9, characterized in that, The driving cylinder of the second positioning member is arranged below the positioning seat of the second positioning member. The positioning shaft of the second positioning member and the output shaft of the driving cylinder of the second positioning member are arranged side by side. The second positioning member also includes a synchronization plate that connects the positioning shaft of the second positioning member and the output shaft of the second driving cylinder of the second positioning member.

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