A screw loading test device

Abstract

This utility model provides a lead screw loading test device, belonging to the technical field of lead screw testing devices. The device includes a base, a lead screw drive assembly, a lead screw loading assembly, and a push-pull force sensor. The advantages of this utility model are as follows: the lead screw drive assembly can drive the lead screw under test to rotate, causing the test nut to move axially, thereby pushing or pulling the push-pull force sensor and subjecting it to a push-pull force load. When the push-pull force reaches a predetermined value, the lead screw loading assembly controls the push-pull force sensor to move synchronously with the test nut. This ensures that the push-pull force sensor maintains a stable load on the test nut during movement, thus improving the accuracy of the pull rod test. Furthermore, the push-pull force sensor can sense the push-pull force value of the test nut by the loading assembly in real time. By controlling the loading motor, the load received by the push-pull force sensor can be adjusted, thereby quickly adjusting the load on the lead screw under test.

Description

Technical Field

[0001] This utility model relates to the technical field of lead screw testing devices, specifically to a lead screw loading testing device. Background Technology

[0002] In mechanical transmission systems, lead screws (or ball screws) serve as core power transmission components, widely used in CNC machine tools, industrial robots, aerospace equipment, and precision molds. Their performance directly affects the positioning accuracy, transmission efficiency, and operational reliability of the equipment. Performance testing of lead screws is a crucial step in ensuring their stable operation under actual working conditions, specifically requiring verification of the following core indicators:

[0003] In the field of lead screw performance testing, traditional loading methods mostly employ hydraulic loading or damped loading. In hydraulic loading systems, the viscosity of the hydraulic oil is significantly affected by temperature, and pressure pulsations are easily generated when the ambient temperature changes, affecting test accuracy. Furthermore, the response speed of hydraulic systems is slow, making it difficult to adapt to the rapid force adjustment requirements of dynamic loading scenarios. Damped loading, through its mechanical damping structure, struggles to provide a stable and consistent load force and suffers from poor repeatability. Additionally, existing hydraulic or damped loading lead screw performance testing devices all suffer from inconvenient load adjustment. None of these loading methods can effectively simulate the actual load conditions of the lead screw during actual operation.

[0004] Therefore, there is a need for a screw loading test device that provides stable and consistent loads that are easy to adjust, thereby improving the efficiency and accuracy of the screw testing device. Utility Model Content

[0005] In view of this, the main objective of this utility model is to provide a lead screw loading test device that can stably perform constant load tests on the lead screw under test and can quickly adjust the load size.

[0006] To achieve the above objectives, this utility model proposes a lead screw loading test device, comprising: a base, a lead screw drive assembly, a lead screw loading assembly, and a push-pull force sensor;

[0007] The base is equipped with a slide rail;

[0008] The lead screw drive assembly includes a drive motor, a first torque sensor, a test nut, and a lead screw to be tested. The output shaft of the drive motor, the first torque sensor, and the lead screw to be tested are connected in sequence. The test nut is fixed on a test sliding seat, which is slidably mounted on a slide rail. One end of the lead screw to be tested is connected to the first torque sensor, and the other end passes through the test nut and is threaded into the test nut.

[0009] The lead screw loading assembly includes a loading motor, a loading lead screw, a loading sleeve, and a loading sliding seat. The output shaft of the loading motor is connected to the loading lead screw. The loading sleeve is fixed on the loading sliding seat. The loading sliding seat is slidably mounted on the slide rail. The loading lead screw passes through the loading sleeve and is threadedly engaged with the loading nut. The push-pull force sensor is connected to the loading sliding seat and the test sliding seat.

[0010] Furthermore, the base is a rectangular base plate, and there are two slide rails, which are fixed on both sides of the base respectively.

[0011] Furthermore, each end of the base is provided with a mounting seat, and the drive motor and the loading motor are respectively fixed on the two motor seats.

[0012] Furthermore, the lead screw loading assembly also includes a second torque sensor, the two ends of which are connected to the loading lead screw and the output shaft of the loading motor, respectively.

[0013] Furthermore, both the drive motor and the loading motor are equipped with speed reducers.

[0014] Furthermore, it also includes a first coupling and a second coupling, the first coupling connecting the first torque sensor and the lead screw to be tested, and the second coupling connecting the second torque sensor and the loading lead screw.

[0015] Furthermore, it also includes a first connecting slide plate and a second sliding connecting plate. The first connecting slide plate is connected to the test slide, and the second sliding connecting plate is connected to the loading slide. The two ends of the push-pull force sensor are respectively connected to the first connecting slide plate and the second sliding connecting plate.

[0016] Furthermore, multiple sliders are slidably mounted on the slide rail, and the first connecting slide plate, the second sliding connecting slide plate, the test slide plate, and the loading slide plate are all fixedly mounted on the sliders.

[0017] Furthermore, the first connecting slide plate is connected to the test slide plate via multiple first connecting rods, and the second connecting slide plate and the loading slide plate are connected via multiple second connecting rods.

[0018] Furthermore, the lead screw to be tested and the loading lead screw are coaxially arranged.

[0019] The beneficial effects of this lead screw loading test device are as follows: The device includes a base, a lead screw drive assembly, a lead screw loading assembly, and a push-pull force sensor. The lead screw drive assembly drives the lead screw under test to rotate, causing the test nut to move axially, thus pushing or pulling the push-pull force sensor. When the push-pull force reaches a predetermined value, the loading motor of the lead screw loading assembly rotates in the opposite direction. This allows the test lead screw and the loading lead screw to rotate synchronously, enabling the push-pull force sensor to move synchronously with the test nut. This ensures the push-pull force sensor maintains a stable load on the test nut during movement, thereby improving the accuracy of the pull rod test. Furthermore, the push-pull force sensor can sense the push-pull force value of the test nut in real time. By controlling the loading motor, the load received by the push-pull force sensor can be adjusted, thereby quickly adjusting the load on the lead screw under test. This lead screw loading test device can quickly and stably perform constant load tests on the lead screw under test, which helps to evaluate the quality, performance, and reliability of the lead screw, ensuring its stability and accuracy in practical applications. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 for Figure 1 This is a schematic diagram of the overall structure of a lead screw loading test device according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Base, 2-Slide rail, 21-Slider, 3-Drive motor, 31-First torque sensor, 4-Test lead screw, 41-Test sliding seat, 42-First connecting slide plate, 43-Connecting rod, 5-Push-pull force sensor, 6-Loading motor, 61-Second torque sensor, 7-Loading lead screw, 71-Loading sliding seat, 72-Second connecting slide plate, 73-Loading sleeve, 8-Reducer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] Please see Figure 1 This embodiment provides a lead screw loading test device, which includes a base 1, a lead screw drive assembly, a lead screw loading assembly, and a push-pull force sensor 5;

[0028] The base 1 is equipped with a slide rail 2; specifically, the base 1 is a long rectangular base plate, and there are two slide rails 2, which are fixed to the two sides of the base 1 respectively.

[0029] The lead screw drive assembly includes a drive motor 3, a first torque sensor 31, a test nut, and a lead screw 4 to be tested. The drive motor 3 is fixed at the end of the base 1. The output shaft of the drive motor 3, the first torque sensor 31, and the lead screw 4 to be tested are connected in sequence. The lead screw 4 to be tested is parallel to the slide rail 2.

[0030] The test nut (not shown in the figure) is fixed on the test sliding seat 41, which is slidably mounted on the slide rail 2. One end of the test lead screw 4 is connected to the first torque sensor 31, and the other end passes through the test nut and is threadedly engaged with the test nut. Thus, the drive motor 3 can drive the test lead screw 4 to rotate, thereby driving the test nut and the test sliding seat 41 to move axially along the test lead screw 4.

[0031] The lead screw loading assembly includes a loading motor 6, a loading lead screw 7, a loading sleeve 73, and a loading sliding seat 71. The output shaft of the loading motor 6 is connected to the loading lead screw 7. The loading sleeve 73 is fixed on the loading sliding seat 71, which is slidably mounted on the slide rail 2. The loading lead screw 7 passes through the loading sleeve 73 and is threadedly engaged with the loading nut. The lead screw 4 to be tested is arranged parallel to the loading lead screw 7. Thus, the loading motor 6 can drive the loading lead screw 7 to rotate, thereby driving the loading sleeve 73 and the loading sliding seat 71 to slide along the axial direction of the lead screw 4 to be tested. The first torque sensor 31 is used to sense the torque applied to the lead screw 4 by the drive motor 3.

[0032] The push-pull force sensor 5 is connected to the loading slide 71 and the test slide 41. The push-pull force sensor 5 is used to sense the tension or push force between the loading slide 71 and the test slide 41 in real time.

[0033] In this embodiment, both the drive motor 3 and the loading motor 6 are servo motors. It is understood that the lead screw loading test device also includes a control system, which is connected to the drive motor 3, the loading motor 6, and the push-pull force sensor 5. The control system can obtain the magnitude of the tension or push force between the loading slide block 71 and the test slide block 41 through the push-pull force sensor 5, and can further control the movement state of the drive motor 3 and the loading motor 6 as needed.

[0034] In a preferred embodiment, the base 1 has mounting seats at both ends, and the drive motor 3 and the loading motor 6 are respectively fixed on the two mounting seats. Both the drive motor 3 and the loading motor 6 are equipped with a reducer 8.

[0035] The lead screw loading assembly also includes a second torque sensor 61, whose two ends are connected to the loading lead screw 7 and the output shaft of the loading motor 6, respectively. The second torque sensor 61 is used to sense the torque applied by the loading motor 6 to the loading lead screw 7.

[0036] In a preferred embodiment, the lead screw loading test device further includes a first coupling and a second coupling. The first coupling connects the first torque sensor 31 and the lead screw 4 to be tested, and the second coupling connects the second torque sensor 61 and the loading lead screw 7.

[0037] In a preferred embodiment, the lead screw loading test device further includes a first connecting slide plate 42 and a second sliding connecting plate 72. The first connecting slide plate 42 is connected to the test slide 41, and the second sliding connecting plate 72 is connected to the loading slide 71. The push-pull force sensor 5 is connected at both ends to the first connecting slide plate 42 and the second sliding connecting plate 72, respectively. A plurality of sliders 21 are slidably provided on the slide rail 2. The first connecting slide plate 42, the second sliding connecting plate 72, the test slide 41, and the loading slide 71 are all fixedly mounted on the sliders 21. The sliders 21 are used to reduce the sliding friction of the first connecting slide plate 42, the second sliding connecting plate 72, the test slide 41, and the loading slide 71 on the slide rail 2.

[0038] In a preferred embodiment, the lead screw loading test device further includes multiple connecting rods 43. Each connecting rod 43 consists of multiple parallel first connecting rods and second connecting rods connected together. A first connecting slide plate 42 is connected to the test slide 41 via the first connecting rod, and a second sliding connecting plate 72 is connected to the loading slide 71 via the second connecting rod. The first connecting rod provides a moving space between the first connecting slide plate 42 and the test slide 41, facilitating the lead screw 4 under test to drive the first connecting slide plate 42 and the test slide 41 to move. The second connecting rod provides a moving space between the second sliding connecting plate 72 and the loading slide 71, facilitating the lead screw 4 under test to drive the first connecting slide plate 42 and the test slide 41 to move.

[0039] The working principle of this lead screw loading test device is as follows: The drive motor 3 of the lead screw drive device drives the lead screw 4 under test to rotate. The rotation of the lead screw 4 under test causes the test nut to move axially, while the push-pull force sensor 5 is in a fixed state. The axial movement of the test nut causes the push-pull force sensor 5 to generate a load (i.e., the tension / compression sensor will detect a push-pull force). When the load value of the push-pull force sensor 5 reaches a predetermined value, the control system rotates the servo motor of the lead screw loading assembly in the opposite direction, so that the push-pull force sensor 5 moves synchronously with the test sliding seat 41 while maintaining the load value, thereby ensuring the stability of the load on the lead screw under test by the push-pull force sensor. The control system can adjust the load on the push-pull force sensor 5 by controlling the loading motor 6, thereby quickly adjusting the load on the lead screw 4 under test.

[0040] The dual-motor mechanism of this lead screw drive device can precisely control the lead screw load. By combining the magnitude of the push-pull load and the torque applied to the lead screw, the transmission efficiency of the lead screw can be obtained. Compared with previous load-bearing methods using hydraulic or damped loading, this method is more stable, reliable, and accurate. This lead screw drive device can quickly and stably perform constant load tests on the lead screw under test (4), thereby helping to evaluate the quality, performance, and reliability of the lead screw and ensuring its stability and accuracy in practical applications.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A lead screw loading test device, characterized in that, include: Base (1), lead screw drive assembly, lead screw loading assembly and push-pull force sensor (5); The base (1) is provided with a slide rail (2); The lead screw drive assembly includes a drive motor (3), a first torque sensor (31), a test nut, and a lead screw (4) to be tested. The output shaft of the drive motor (3), the first torque sensor (31), and the lead screw (4) to be tested are connected in sequence. The test nut is fixed on the test sliding seat (41), which is slidably mounted on the slide rail (2). One end of the lead screw (4) to be tested is connected to the first torque sensor (31), and the other end passes through the test nut and is threadedly engaged with the test nut. The lead screw loading assembly includes a loading motor (6), a loading lead screw (7), a loading sleeve (73), and a loading sliding seat (71). The output shaft of the loading motor (6) is connected to the loading lead screw (7). The loading sleeve (73) is fixed on the loading sliding seat (71). The loading sliding seat (71) is slidably mounted on the slide rail (2). The loading lead screw (7) passes through the loading sleeve (73) and is threadedly engaged with the loading nut. The push-pull force sensor (5) is connected to the loading sliding seat (71) and the test sliding seat (41).

2. The lead screw loading test device according to claim 1, characterized in that, The base (1) is a rectangular base plate, and there are two slide rails (2), which are fixed on both sides of the base (1).

3. The lead screw loading test device according to claim 1, characterized in that, The base (1) has mounting seats at both ends, and the drive motor (3) and the loading motor (6) are respectively fixed on the two mounting seats.

4. The lead screw loading test device according to claim 1, characterized in that, The lead screw loading assembly also includes a second torque sensor (61), the two ends of which are connected to the output shaft of the loading lead screw (7) and the loading motor (6), respectively.

5. The lead screw loading test device according to claim 1, characterized in that, Both the drive motor (3) and the loading motor (6) are equipped with a reducer (8).

6. The lead screw loading test device according to claim 4, characterized in that, It also includes a first coupling and a second coupling. The first coupling connects the first torque sensor (31) and the lead screw (4) to be tested, and the second coupling connects the second torque sensor (61) and the loading lead screw (7).

7. The lead screw loading test device according to claim 2, characterized in that, It also includes a first connecting slide plate (42) and a second sliding connecting plate (72). The first connecting slide plate (42) is connected to the test slide (41), and the second sliding connecting plate (72) is connected to the loading slide (71). The two ends of the push-pull force sensor (5) are respectively connected to the first connecting slide plate (42) and the second sliding connecting plate (72).

8. The lead screw loading test device according to claim 7, characterized in that, Multiple sliders (21) are slidably mounted on the slide rail (2). The first connecting slide plate (42), the second sliding connecting plate (72), the test slide (41), and the loading slide (71) are all fixedly mounted on the sliders (21).

9. A lead screw loading test device according to claim 8, characterized in that, The first connecting slide plate (42) is connected to the test slide (41) through a plurality of first connecting rods (43), and the second connecting slide plate (72) and the loading slide (71) are connected through a plurality of second connecting rods.

10. The lead screw loading test device according to claim 1, characterized in that, The lead screw to be tested (4) and the loading lead screw (7) are coaxially arranged.

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