Batch testing device for linear displacement sensor life test
By designing a device that includes a drive shaft, turntable, connecting rod, slider, and guide rail, synchronous life testing of multiple linear displacement sensors was achieved. This solved the problems of low efficiency and connecting rod pressure damage in traditional devices, improved the continuity of testing, and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU HONGMING ELECTRONICS CO LTD
- Filing Date
- 2023-08-21
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional linear displacement sensor life testing devices can only perform tests independently, resulting in low testing efficiency. Furthermore, the angular pressure between the connecting rod and the push rod can damage the bearings, affecting the continuity of testing and increasing costs.
Design a device comprising a first drive shaft, a second drive shaft, a turntable, a connecting rod, a connecting seat, a sliding frame, a slider, a guide rail, and a push rod. A drive motor drives multiple connecting rods to move synchronously. The slider and the guide rail are connected by a rolling ring assembly and steel ball rollers to achieve synchronous life test of multiple sensors.
It enables efficient batch life testing of multiple sensors, ensuring the continuity of repeated motion over long periods, reducing the possibility of damage to sliders and guide rails, and lowering the cost of replacing parts.
Smart Images
Figure CN117213545B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a life testing device for linear displacement sensors, and more particularly to a batch testing device for life testing of linear displacement sensors. Background Technology
[0002] Linear displacement sensors are used for linear position detection, providing feedback on the linear position of servo motors to achieve closed-loop control of servo mechanisms, and are an important component of servo systems. The sliding life of a linear displacement sensor directly affects the lifespan of the servo system, therefore, a sliding life of up to 1 million cycles is typically required. To verify the reliability of linear displacement sensors, life tests are necessary before shipment. Because the required sliding life of linear displacement sensors is so high, a life testing device is required to complete this test.
[0003] Traditional linear displacement sensor life testing devices typically have a linear motion output shaft. To ensure test readiness and safety, only one linear displacement sensor can usually be tested simultaneously, resulting in low testing efficiency and failing to meet the demands of high-efficiency batch testing. Furthermore, traditional linear displacement sensor life testing devices generally convert rotational motion into linear motion via a connecting rod. Since the push rod connected to the linear displacement sensor's sliding handle (or pull rod) can only move in a linear direction, linear bearings or guide cylinders are generally used to limit the push rod's direction of movement. The oscillating connecting rod exerts pressure at a certain angle relative to the push rod's axis. This pressure, over hundreds of thousands of repeated movements, can damage the linear bearings or guide cylinder. This can lead to changes in the push rod's direction of movement, affecting test results, and necessitates component replacement, impacting the continuity of testing efficiency and increasing costs. Summary of the Invention
[0004] The purpose of this invention is to provide a batch testing device for life testing of linear displacement sensors that can simultaneously complete life tests of multiple products in order to solve the above-mentioned problems.
[0005] The present invention achieves the above objectives through the following technical solutions:
[0006] A batch testing device for life testing of linear displacement sensors includes a mounting plate, a first drive shaft, a second drive shaft, a turntable, a connecting rod, a connecting seat, a sliding frame, a slider, a guide rail, and a push rod. Two first drive shafts and one second drive shaft are respectively mounted on the mounting plate via drive shaft mounting brackets and are capable of free rotation around their own center lines. The second drive shaft is located between the two first drive shafts, and their center lines coincide. A turntable is mounted at each end of the second drive shaft and at the end of each of the two first drive shafts closest to the second drive shaft. Every two adjacent turntables are rotatably connected to one end of a connecting rod, and the other ends of the two connecting rods are respectively connected to two... The connecting seats are rotatably connected, and two connecting seats are respectively mounted on the sliding frame. One end of a plurality of parallel push rods is connected to the sliding frame, and the push rods and the connecting seats are respectively located on opposite sides of the sliding frame. Two sliders are respectively connected to both ends of the sliding frame. Two guide rails parallel to the plurality of push rods are respectively mounted on the mounting plate and are respectively located outside the two connecting rods. The two sliders are respectively mounted on the two guide rails and can freely roll or slide relative to the guide rails but cannot move radially on the guide rails. Sensor mounting seats for mounting linear displacement sensors are respectively provided on the mounting plate at positions corresponding to the other ends of the plurality of push rods.
[0007] Preferably, to achieve the limiting rolling connection function between the slider and the guide rail, both ends of the guide rail are respectively mounted on the mounting plate via guide rail mounting brackets. The surface of the guide rail away from the mounting plate is provided with a "V" shaped groove. The slider is provided with a mounting groove, and the corresponding guide rail passes through the mounting groove. A "V" shaped rolling ring with a radial cross-section of "V" is fitted outside the first bearing. The first bearing is fitted outside the first pivot pin. Both ends of the first pivot pin are respectively connected to the two side groove walls of the mounting groove of the slider. The "V" shaped rolling ring is placed in the "V" shaped groove. The bottom of the mounting groove of the slider is provided with a mounting hole, and a steel ball roller is installed in the mounting hole. The steel ball of the steel ball roller is in contact with the surface of the guide rail near the mounting plate.
[0008] Preferably, in order to achieve a stable rolling connection between the slider and the guide rail, one "V" shaped rolling ring, one first bearing, and one first pivot pin constitute a rolling ring assembly. Two rolling ring assemblies are installed on one slider, and the "V" shaped rolling rings of the two rolling ring assemblies are sequentially placed in the "V" shaped grooves of the corresponding guide rails. There are 2-6 steel ball rollers on one slider.
[0009] Preferably, in order to further improve the limiting effect of the "V" groove on the "V" shaped rolling ring, a coaxial central groove is provided at the center of the "V" groove, and an annular rolling ring protrusion is provided at the center of the outer peripheral surface of the "V" shaped rolling ring, with the rolling ring protrusion placed in the central groove.
[0010] Preferably, in order to achieve a reliable transmission connection between two adjacent turntables and a reliable rotational connection with the connecting rod, and also to achieve a reliable rotational connection between the connecting rod and the connecting seat, the connection structure between the connecting rod and the turntable is as follows: Second bearings are respectively fitted onto the outer ends and middle of the second pivot pin; a turntable through hole is provided near the edge on every two adjacent turntables; the second bearings at both ends of the second pivot pin are respectively placed in the corresponding turntable through holes; a first connecting rod through hole is provided at the corresponding end of the connecting rod; and the second bearing located in the middle of the second pivot pin is placed in the corresponding first connecting rod through hole. The connection structure between the connecting rod and the connecting seat is as follows: a connecting groove is provided on the connecting seat, and the two ends of the third pivot pin are respectively connected to the two side walls of the connecting groove; a third bearing is fitted onto the outer middle of the third pivot pin; a second connecting rod through hole is provided at the corresponding end of the connecting rod; and the third bearing is placed in the second connecting rod through hole.
[0011] Preferably, in order to facilitate reliable installation of the first and second drive shafts and enable them to rotate freely, the outer wall of the middle portion of the first drive shaft is provided with a first protrusion protruding in the outward peripheral direction, and the outer wall of the middle portion of the second drive shaft is provided with a second protrusion protruding in the outward peripheral direction. Fourth bearings are respectively fitted on the first drive shaft near the two ends of the first protrusion and on the second drive shaft near the two ends of the second protrusion. Multiple fourth bearings are respectively mounted on the drive shaft mounting bracket.
[0012] Preferably, for ease of processing and assembly, the drive shaft mounting bracket is provided with a mounting groove, and the corresponding fourth bearing is placed in the mounting groove and positioned by a mounting bracket cover plate connected to the drive shaft mounting bracket.
[0013] Preferably, in order to achieve the anti-rotation connection function between the first drive shaft and the second drive shaft and other components, an anti-rotation plane is provided on the outer wall surfaces at both ends of the first drive shaft and the outer wall surfaces at both ends of the second drive shaft.
[0014] Preferably, in order to achieve the rotational drive function by a drive motor, one end of the drive shaft is connected to one end of one of the first transmission shafts via a coupling; the drive shaft is the rotating shaft of the drive motor, or one end of the drive shaft is connected to the rotating shaft of the drive motor.
[0015] The beneficial effects of this invention are as follows:
[0016] This invention, through the design of a first drive shaft, a second drive shaft, a turntable, a connecting rod, a connecting seat, a sliding frame, a slider, a guide rail, and push rods that cooperate with each other, requires only one drive motor to drive the two connecting rods to move synchronously, thereby driving the sliding frame and multiple push rods to move synchronously in a linear motion. The multiple push rods can drive the sliding handles or pull rods of multiple linear displacement sensors to reciprocate, thus achieving the purpose of simultaneously conducting batch life tests on multiple linear displacement sensors, meeting the requirements of high-efficiency batch testing. Simultaneously, the sliding connection structure between the slider and the guide rail bears the pressure at a certain angle relative to the axial direction of the push rods during the movement of the connecting rods, ensuring long-term stability. The continuous repetitive motion at intervals and high speeds improves the continuity and accuracy of life tests. The connection structure between the slider and the guide rail adopts a rolling ring assembly and a steel ball roller. While ensuring the accurate linear guidance of the slider's motion by the guide rail, it also realizes the rolling connection function between the slider and the guide rail. This minimizes the possibility of damage to the slider and guide rail caused by pressure at a certain angle relative to the axial direction of the push rod. It meets the test continuity requirements of up to hundreds of thousands of reciprocating motions, reduces the cost of replacing parts, and facilitates the installation of more push rods to realize the synchronous life test function of more linear displacement sensors. Attached Figure Description
[0017] Figure 1 This is a partial cross-sectional front view of the batch testing device for life testing of linear displacement sensors according to the present invention;
[0018] Figure 2 This is the AA sectional view in the partial top view of the batch test device for life testing of linear displacement sensors described in this invention;
[0019] Figure 3 This is a front view schematic diagram of the guide rail structure of the batch testing device for life testing of the linear displacement sensor described in this invention. The scale of the diagram is larger than [missing information]. Figure 1 and Figure 2 ;
[0020] Figure 4 This is a top view of the guide rail structure of the batch testing device for life testing of the linear displacement sensor described in this invention. The scale of the figure is larger than […]. Figure 3 . Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings:
[0022] like Figures 1-4As shown, the batch testing device for life testing of linear displacement sensors of the present invention includes a mounting plate 1, a first drive shaft 2, a second drive shaft 13, a turntable 7, a connecting rod 12, a connecting seat 18, a sliding frame 21, a slider 20, a guide rail 17, and a push rod 24. Two first drive shafts 2 and one second drive shaft 13 are respectively mounted on the mounting plate 1 via a drive shaft mounting bracket 3 and can rotate freely around their own center lines. The second drive shaft 13 is located between the two first drive shafts 2, and their center lines coincide. A turntable 7 is mounted at each end of the second drive shaft 13 and at the end of each of the two first drive shafts 2 closest to the second drive shaft 13. Every two adjacent turntables 7 are rotatably connected to one end of a connecting rod 12, and the other ends of the two connecting rods 12 are rotatably connected to two connecting seats 18. The two connecting seats 18 are respectively connected to... Multiple (three in the figure, but more) parallel push rods 24 are mounted on the sliding frame 21. One end of each push rod 24 is connected to the sliding frame 21 by a screw (not shown in the figure), and the push rods 24 and the connecting seat 18 are located on opposite sides of the sliding frame 21. Two sliders 20 are connected to both ends of the sliding frame 21 by screws (not shown in the figure). Two guide rails 17 parallel to the multiple push rods 24 are mounted on the mounting plate 1 and located outside the two connecting rods 12. The two sliders 20 are mounted on the two guide rails 17 and can roll or slide freely relative to the guide rails 17, but cannot move radially in the guide rails 17. Sensor mounting seats 25 for mounting linear displacement sensors 26 are provided on the mounting plate 1 at positions corresponding to the other ends of the multiple push rods 24.
[0023] like Figures 1-4 As shown, the present invention also discloses the following more optimized specific structures:
[0024] To achieve the limiting rolling connection function between the slider 20 and the guide rail 17, both ends of the guide rail 17 are mounted on the mounting plate 1 via the guide rail mounting bracket 16. The side surface of the guide rail 17 away from the mounting plate 1 is provided with a "V" shaped groove 30. The slider 20 is provided with a mounting groove (not marked in the figure), and the corresponding guide rail 17 passes through the mounting groove. A "V" shaped rolling ring 23 with a radial cross section of "V" is fitted outside the first bearing 22. The first bearing 22 is fitted outside the first pivot pin 29. Both ends of the first pivot pin 29 are connected to the two side groove walls of the mounting groove of the slider 20. The "V" shaped rolling ring 23 is placed in the "V" shaped groove 30. The bottom of the mounting groove of the slider 20 is provided with a mounting hole, and a steel ball roller 28 is installed in the mounting hole. The steel balls of the steel ball roller 28 are in contact with the side surface of the guide rail 17 near the mounting plate 1.
[0025] To achieve a stable rolling connection between the slider 20 and the guide rail 17, a "V"-shaped rolling ring 23, a first bearing 22, and a first pivot pin 29 constitute a rolling ring assembly. Two of the rolling ring assemblies are installed on a slider 20. The "V"-shaped rolling rings 23 of the two rolling ring assemblies are placed sequentially in the "V"-shaped grooves 30 of the corresponding guide rails 17. There are 2-6 steel ball rollers 28 on a slider 20 (3 in the figure).
[0026] To further improve the limiting effect of the "V" groove 30 on the "V" shaped rolling ring 23, a coaxial central groove 31 is provided at the center of the "V" groove 32, and an annular rolling ring protrusion (not marked in the figure) is provided at the center of the outer peripheral surface of the "V" shaped rolling ring 23, which is placed in the central groove 31.
[0027] To achieve reliable transmission connection between two adjacent turntables 7 and their rotational connection with connecting rod 12, and to achieve reliable rotational connection between connecting rod 12 and connecting seat 18, the connection structure between connecting rod 12 and turntable 7 is as follows: Second bearings 9 are respectively fitted onto the outer ends and middle of the second pivot pin 8; positioning springs 10 are installed on the second pivot pin 8 between each second bearing 9; turntable through holes (not marked in the figure) are provided near the edge on every two adjacent turntables 7; and the second bearings 9 located at both ends of the second pivot pin 8 are respectively placed in the corresponding turntable through holes. Inside the hole, the corresponding end of the connecting rod 12 is provided with a first connecting rod through hole (not marked in the figure), and the second bearing 9 located in the middle of the second pivot pin 8 is placed in the corresponding first connecting rod through hole; the connection structure between the connecting rod 12 and the connecting seat 18 is as follows: the connecting seat 18 is provided with a connecting groove (not marked in the figure) and the two ends of the third pivot pin 19 are respectively connected to the two side walls of the connecting groove, the middle of the third pivot pin 19 is fitted with a third bearing (not marked in the figure), the corresponding end of the connecting rod 12 is provided with a second connecting rod through hole (not marked in the figure), and the third bearing is placed in the second connecting rod through hole.
[0028] To facilitate reliable installation of the first drive shaft 2 and the second drive shaft 13 and enable them to rotate freely, the outer wall of the middle part of the first drive shaft 2 is provided with a first protrusion 5 protruding in the outward direction, and the outer wall of the middle part of the second drive shaft 13 is provided with a second protrusion 11 protruding in the outward direction. Fourth bearings 6 are respectively installed on the first drive shaft 2 near the two ends of the first protrusion 5 and on the second drive shaft 13 near the two ends of the second protrusion 11. Multiple fourth bearings 6 are respectively installed on the drive shaft mounting bracket 3.
[0029] To facilitate processing and assembly, the drive shaft mounting bracket 3 is provided with a mounting groove, and the corresponding fourth bearing 6 is placed in the mounting groove and positioned by the mounting bracket cover plate 4 connected to the drive shaft mounting bracket 3.
[0030] In order to achieve the anti-rotation connection function between the first drive shaft 2 and the second drive shaft 13 and other components, an anti-rotation plane (not marked in the figure) is provided on the outer wall surface at both ends of the first drive shaft 2 and the outer wall surface at both ends of the second drive shaft 13.
[0031] In order to achieve the rotational drive function by a drive motor (not shown in the figure), one end of the drive shaft 15 is connected to one end of one of the first transmission shafts 2 via a coupling 14; the drive shaft 15 is the rotating shaft of the drive motor, or one end of the drive shaft 15 is connected to the rotating shaft of the drive motor.
[0032] Figure 1 and Figure 2 A positioning plate 27 is also shown on the sensor mounting base 25 for positioning the linear displacement sensor 26.
[0033] like Figures 1-4 As shown, in application, mounting plate 1 is generally placed horizontally, that is... Figure 1 For the top-down view, multiple linear displacement sensors 26 to be tested are mounted on multiple sensor mounting bases 25. The corresponding ends of multiple push rods 24 are connected to the sliding handles or pull rods of the multiple linear displacement sensors 26. After starting the drive motor, the drive shaft 15 drives the first transmission shaft 2, the second transmission shaft 13, and the turntable 7 to rotate synchronously. One end of the connecting rod 12 rotates synchronously with the turntable 7. During the rotation of the connecting rod 12, it moves axially along the push rod 24. Since the connecting rod 12 can rotate freely between itself and the connecting seat 18, and the sliding frame 21 can only move synchronously with the two sliders 20 along the axial direction of the push rod 24, the connecting rod 12 drives the sliding frame 21 and multiple push rods 24 to reciprocate synchronously along the axial direction of the push rod 24 through the connecting seat 18. The push rod 24 drives the sliding handles or pull rods of multiple linear displacement sensors 26 to reciprocate synchronously. By detecting (or directly knowing from the drive motor) the number of rotations of the drive motor shaft, the number of reciprocating motions of the sliding handles or pull rods of the linear displacement sensors 26 can be determined, thus achieving the purpose of simultaneously conducting life tests on multiple linear displacement sensors 26. During this process, the two sliders 20 drive the corresponding "V"-shaped rolling rings 23 and steel ball rollers 28 to roll on the two guide rails 17. The friction is small and can easily bear the pressure generated by the movement of the connecting rod 12, which has a certain angle with the axis of the push rod 24, thus avoiding damage to the sliders 20, guide rails and related components by this pressure, and meeting the test continuity requirements of up to hundreds of thousands of reciprocating motions.
[0034] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.
Claims
1. A batch testing device for life testing of linear displacement sensors, comprising a mounting plate, a first drive shaft, a second drive shaft, a turntable, a connecting rod, a connecting seat, a sliding frame, a slider, a guide rail, and a push rod, characterized in that: Two first drive shafts and one second drive shaft are respectively mounted on the mounting plate via drive shaft mounting brackets and can rotate freely around their own center lines. The second drive shaft is located between the two first drive shafts and their center lines coincide. A turntable is mounted at each end of the second drive shaft and at the end of each of the two first drive shafts near the second drive shaft. Every two adjacent turntables are rotatably connected to one end of a connecting rod. The other ends of the two connecting rods are rotatably connected to two connecting seats. The two connecting seats are respectively mounted on the sliding frame. One end of a plurality of parallel push rods is connected to the sliding frame, and the push rods and the connecting seats are respectively located on opposite sides of the sliding frame. Two sliders are respectively connected to both ends of the sliding frame. Two guide rails parallel to the plurality of push rods are respectively mounted on the mounting plate and located outside the two connecting rods. The two sliders are respectively mounted on the two guide rails and can roll or slide freely relative to the guide rails but cannot move radially on the guide rails. Sensor mounting brackets for mounting linear displacement sensors are respectively provided on the mounting plate at positions corresponding to the other ends of the plurality of push rods. The guide rail is mounted on the mounting plate via guide rail mounting brackets at both ends. A "V"-shaped groove is provided on the surface of the guide rail away from the mounting plate. The slider has a mounting groove, and the corresponding guide rail passes through this mounting groove. A "V"-shaped rolling ring with a radial cross-section of "V" is fitted outside the first bearing. The first bearing is fitted outside the first pivot pin. Both ends of the first pivot pin are connected to the two side walls of the mounting groove of the slider. The "V"-shaped rolling ring is placed within the "V"-shaped groove. The bottom of the mounting groove of the slider has a mounting hole, and a steel ball roller is installed in this mounting hole. The steel balls of the wheel contact the side surface of the guide rail near the mounting plate; one "V" shaped rolling ring, one first bearing, and one first swivel pin constitute a rolling ring assembly; two rolling ring assemblies are mounted on one slider; the "V" shaped rolling rings of the two rolling ring assemblies are sequentially placed in the "V" shaped grooves of the corresponding guide rails; there are 2-6 steel ball rollers on one slider; a coaxial central groove is provided at the center of the "V" shaped groove; a circular rolling ring protrusion is provided at the center of the outer peripheral surface of the "V" shaped rolling ring, and the rolling ring protrusion is placed in the central groove.
2. The batch testing device for life testing of linear displacement sensors according to claim 1, characterized in that: The connection structure between the connecting rod and the turntable is as follows: a second bearing is fitted on both ends and the middle of the second pivot pin, and a turntable through hole is provided on every two adjacent turntables near the edge. The second bearings at both ends of the second pivot pin are respectively placed in the corresponding turntable through holes. A first connecting rod through hole is provided at the corresponding end of the connecting rod, and the second bearing in the middle of the second pivot pin is placed in the corresponding first connecting rod through hole. The connection structure between the connecting rod and the connecting seat is as follows: a connecting groove is provided on the connecting seat, and both ends of the third pivot pin are respectively connected to the two side walls of the connecting groove. A third bearing is fitted on the middle of the third pivot pin, and a second connecting rod through hole is provided at the corresponding end of the connecting rod. The third bearing is placed in the second connecting rod through hole.
3. The batch testing device for life testing of linear displacement sensors according to claim 1, characterized in that: The first drive shaft has a first protrusion protruding outward in the outer wall of its middle section, and the second drive shaft has a second protrusion protruding outward in the outer wall of its middle section. Fourth bearings are respectively installed on the first drive shaft near the two ends of the first protrusion and on the second drive shaft near the two ends of the second protrusion. Multiple fourth bearings are respectively installed on the drive shaft mounting bracket.
4. The batch testing device for life testing of linear displacement sensors according to claim 3, characterized in that: The drive shaft mounting bracket is provided with a mounting groove, and the corresponding fourth bearing is placed in the mounting groove and positioned by a mounting bracket cover plate connected to the drive shaft mounting bracket.
5. The batch testing device for life testing of linear displacement sensors according to claim 1, characterized in that: An anti-rotation plane is provided on the outer wall surfaces at both ends of the first drive shaft and the outer wall surfaces at both ends of the second drive shaft.
6. The batch testing device for life testing of linear displacement sensors according to claim 1, characterized in that: One end of the drive shaft is connected to one end of one of the first transmission shafts via a coupling; the drive shaft is the shaft of a drive motor, or one end of the drive shaft is connected to the shaft of the drive motor.