Nut-screw pair loading test technology

Abstract

The present invention provides a nut-screw pair loading test technology, which relates to the technical field of nut-screw pair testing equipment; the nut-screw pair loading test technology includes a support frame, a test mechanism and a load loading mechanism. Among them, the test mechanism includes a rotary power output unit arranged on the support frame, a screw driven by the rotary power output unit to rotate on the support frame, a slide seat capable of sliding along the axial direction of the screw on the support frame, and a nut fixed on the slide seat and screwed to the screw; the load loading mechanism includes a mounting seat and a plurality of counterweight blocks, the mounting seat is connected to the slide seat and can be guided to rise and fall on the support frame, and each counterweight block is stacked on the mounting seat. When the screw is driven by the rotary power output unit to rotate, the slide seat can slide along the axial direction of the screw and drive the mounting seat to rise or fall on the support frame. The nut-screw pair loading test technology of the present invention can conveniently adjust the load applied to the nut.

Description

Technical Field

[0001] The present invention relates to the technical field of nut-screw pair testing equipment, and in particular to a nut-screw pair loading testing technology. Background Art

[0002] The nut-screw pair is a common mechanical transmission pair, which is mainly used for transmission mechanisms that convert rotational motion into linear motion or convert linear motion into rotational motion. It has the characteristics of high transmission accuracy, high transmission efficiency, good wear resistance and long service life. It is widely used in the field of aerospace equipment.

[0003] In order to verify the performance parameters and service life of the nut-screw pair and ensure the normal operation of the nut-screw pair, it is necessary to perform a loading test on it to evaluate its performance under different working conditions and thus ensure the reliability of the equipment. Therefore, it is necessary to design a loading test technology to simulate the connection relationship, stress conditions and working environment of the nut-screw pair in actual applications to detect whether it can meet the design requirements.

[0004] However, the existing nut-screw pair testing equipment cannot conveniently adjust the load applied to the nut during the test. Summary of the invention

[0005] To this end, the present invention proposes a nut-screw pair loading test technology to better verify the performance parameters and service life of the nut-screw pair.

[0006] The technical solution of the present invention is as follows: A nut-screw pair loading test technology, comprising: Support frame; The test mechanism comprises a rotary power output unit and a slide seat, wherein the rotary power output unit is fixedly mounted on the support frame and is used to drive the lead screw to be tested to rotate, the slide seat is mounted on the support frame and is able to slide on the support frame along the axial direction of the lead screw to be tested, and the slide seat is used to fix the nut to be tested that is threadedly connected to the lead screw; The load loading mechanism includes a mounting seat and a plurality of counterweight blocks. The mounting seat is connected to the slide seat and can be guided to rise and fall on the support frame. A plurality of counterweight blocks are stacked on the mounting seat. When the lead screw is driven by the rotary power output unit to rotate, the slide seat can slide along the axial direction of the lead screw and drive the mounting seat to rise or fall.

[0007] Furthermore, the rotary power output unit includes a motor disposed on the support frame, and a reducer disposed on the support frame and connected to an output end of the motor.

[0008] Furthermore, a driving gear is fixedly sleeved on the output shaft of the reducer, and a driven gear coaxial with and fixedly connected to the lead screw is provided on the lead screw, and the driven gear is meshed with the driving gear.

[0009] Furthermore, a grating displacement sensor is provided on the support frame, and the grating displacement sensor is located on one side of the slide and is used to detect the displacement of the slide; relative to the side where the grating displacement sensor is provided, two limit switches are provided on the other opposite side of the slide, and the two limit switches can be triggered by the slide respectively to limit the bidirectional displacement of the slide.

[0010] Furthermore, a support is provided on the support frame, and the fixed position of the support on the support frame can be adjusted along the axial direction of the lead screw, and the rotary power output unit is fixed on the support.

[0011] Furthermore, the support frame is provided with a plurality of T-slots extending along the axial direction of the lead screw, and the support is provided with through holes respectively corresponding to the T-slots. Bolts can pass upward through the T-slots and the through holes and be threadedly connected with the connecting nuts to fix the support on the support frame.

[0012] Furthermore, the mounting seat includes a vertical plate that can be guided and slidably arranged on the support frame, and a support plate fixedly arranged at the bottom end of the vertical plate; a guide column is fixedly arranged on the top surface of the support plate, and each of the counterweight blocks is stacked on the support plate, and each of the counterweight blocks is respectively provided with a guide hole that is sleeved on the guide column.

[0013] Furthermore, a plurality of the counterweight blocks are stacked on the support frame; the mounting seat is provided with two lifting assemblies which are disposed on both sides of each of the counterweight blocks, and the two lifting assemblies respectively include a first power unit, a second power unit and a lifting plate, the lifting plate can be driven by the first power unit to rise or fall, and can be driven by the second power unit to be inserted between two adjacent counterweight blocks, or to be removed from between two adjacent counterweight blocks.

[0014] Furthermore, the first power unit includes a driving unit, an active bevel gear and two reciprocating screws arranged on the mounting seat, the two reciprocating screws are coaxially arranged up and down, and the two reciprocating screws are respectively provided with one-way bearings, the working directions of the two one-way bearings are opposite, and the two one-way bearings are respectively provided with bevel gears; the active bevel gear is meshed with the two bevel gears and can be driven to rotate by the driving unit; sliding blocks are respectively screwed on the two reciprocating screws, and the second power unit and the lifting plate are respectively provided on the two sliding blocks.

[0015] Furthermore, the mounting seat is connected to the sliding seat via a traction rope, the sliding seat is rotatably provided with a first pulley, the axial direction of the first pulley is parallel to the height direction of the support frame, and the support frame is rotatably provided with two second pulleys, the axial directions of the two second pulleys are perpendicular to the axial direction of the screw; one end of the traction rope is fixedly connected to the mounting seat, and the other end passes through one of the two second pulleys, the first pulley and the other of the two second pulleys in sequence, and then is fixedly connected to the mounting seat.

[0016] The working principle and beneficial effects of the present invention are: The nut-screw pair loading test technology provided by the present invention is achieved by arranging a rotational power output unit, a screw, a slide, a nut and a load loading mechanism on a support frame; the rotational power output unit can drive the screw to rotate so that the nut moves along the axial direction of the screw with the slide, and a load along the axial direction of the screw is loaded on the slide, that is, on the nut, through a mounting seat connected to the slide, and different numbers of counterweights can be stacked on the mounting seat to load different loads on the nut, thereby conveniently performing loading tests on the nut-screw pair under different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 A stereoscopic diagram of a nut-screw pair loading test technology provided by an embodiment of the present invention; Figure 2 A three-dimensional diagram from another angle of the nut-screw pair loading test technology provided by an embodiment of the present invention; Figure 3 A schematic diagram of a lifting mechanism provided by an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged view of the middle A; In the figure: 100, support frame; 110, support; 120, support seat; 130, first guide rail; 140, grating displacement sensor; 150, limit switch; 160, second guide rail; 170, second pulley; 180, guide rod; 101, T-slot; 102, through hole; 200, test mechanism; 210, rotary power output unit; 211, motor; 212, reducer; 220, driving gear; 230, driven gear; 300, load loading mechanism; 310, mounting seat; 311, vertical plate; 312, support plate; 313, guide column; 314, second Slider; 320, counterweight; 321, top plate; 322, side plate; 400, lead screw; 500, slide seat; 510, first slider; 520, nut seat; 530, first pulley; 600, nut; 700, traction rope; 800, lifting assembly; 810, drive motor; 811, active bevel gear; 820, first reciprocating lead screw; 821, first one-way bearing; 822, first bevel gear; 823, first sliding block; 824, first electric cylinder; 825, first lifting plate; 830, second reciprocating lead screw; 831, second one-way bearing; 832, second bevel gear. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] This embodiment provides a nut-screw pair loading test technology, referring to Figure 1 As shown, it includes a support frame 100, a test mechanism 200 and a load loading mechanism 300. The test mechanism 200 includes a rotational power output unit 210 and a slide 500, wherein the rotational power output unit 210 is arranged on the support frame 100 and is used to drive the lead screw 400 to be tested to rotate, and the slide 500 is used to fix the nut 600.

[0021] The load loading mechanism 300 includes a mounting seat 310 and a plurality of counterweight blocks 320. The mounting seat 310 is connected to the slide seat 500 and can be guided to rise and fall on the support frame 100. Each counterweight block 320 is stacked on the mounting seat 310. When the screw 400 is driven by the rotary power output unit 210 to rotate, the slide seat 500 can slide along the axial direction of the screw 400 and drive the mounting seat 310 to rise or fall.

[0022] Based on the above-mentioned overall structure, the nut-screw pair loading test technology of this embodiment can drive the screw 400 to rotate by the rotary power output unit 210 during the test, and make the nut 600 on the slide 500 that is threaded with the screw 400 move along the axial direction of the screw 400, and the nut 600 can be applied with a load along the axial direction of the screw 400 through the mounting seat 310 connected to the slide 500, thereby simulating the actual working process of the nut-screw pair. Moreover, in the nut-screw pair loading test technology of this embodiment, different axial loads can be applied to the nut 600 by stacking counterweight blocks 320 of different weights on the mounting seat 310, so that different axial loads can be applied to the nut 600, and the nut-screw pair can be conveniently subjected to loading tests under different loads.

[0023] In terms of specific structure, the support frame 100 of this embodiment is a basis for installing other components, which can be arranged as needed, and its structure will not be described in detail here.

[0024] refer to Figure 1 As shown, the rotary power output unit 210 of this embodiment includes a motor 211 disposed on the support frame 100, and a reducer 212 disposed on the support frame 100 and connected to the output end of the motor 211. In some embodiments, the rotary power output unit 210 can also be a device having a rotatable output shaft such as a hydraulic motor or a pneumatic motor.

[0025] In this embodiment, reference Figure 1 and Figure 2 As shown, a support 110 is installed on the support frame 100, and the above-mentioned rotational power output unit 210 is fixed on the support 110, and the fixed position of the support 110 on the support frame 100 can be adjusted along the axial direction of the screw 400, so that the rotational power output unit 210 and the screw 400 can be conveniently replaced by adjusting the fixed position of the support 110 on the support frame 100, so as to facilitate loading tests on nut-screw pairs of different models.

[0026] refer to Figure 2 As shown, in this embodiment, a plurality of T-slots 101 extending along the axial direction of the lead screw 400 are provided on the support frame 100. Specifically, in this embodiment, two T-slots 101 extending along the axial direction of the lead screw 400 are provided on the support frame 100. Obviously, the number of the T-slots 101 can also be three, four or more. Through holes 102 that can be respectively opposite to the two T-slots 101 are provided on the support 110, so that bolts can pass upward through the T-slots 101 and the through holes 102 and be screwed with the connecting nuts, thereby fixing the support 110 on the support frame 100. By adjusting the position of the bolt in the T-slot 101, the fixed position of the support 110 on the support frame 100 can be adjusted along the length direction of the T-slot 101.

[0027] In some embodiments, a plurality of rows of threaded holes may be provided on the support frame 100, and each row of threaded holes is arranged at intervals along the axial direction of the lead screw 400. Corresponding to each row of threaded holes, a long hole is provided on the support 110, so that bolts pass through the long holes and are screwed to the threaded holes to fix the support 110 on the support frame 100. Based on this structure, by aligning the long holes with different threaded holes, the position of the support 110 can be adjusted to a large extent, and by moving the position of the bolts in the long holes, the position of the support 110 can be adjusted to a small extent.

[0028] In this embodiment, reference Figure 1 and Figure 2 As shown, a support seat 120 is fixedly provided on the support frame 100, a through hole is opened on the support seat 120, and a bearing is fixedly installed in the through hole, and the above-mentioned lead screw 400 is fixedly inserted in the bearing so that the lead screw 400 can rotate on the support seat 120. Among them, the bearing is preferably a double-row angular contact bearing, so as to adjust the alignment between the support seat 120 and the nut seat 520 described below.

[0029] refer to Figure 1 and Figure 2 As shown, a driving gear 220 is fixedly sleeved on the output shaft of the above-mentioned reducer 212, and a driven gear 230 coaxial with the driving gear 220 and meshing with the driving gear 220 is fixed on the screw 400. When the output shaft of the reducer 212 rotates, the screw 400 can be driven to rotate through the transmission of the driving gear 220 and the driven gear 230.

[0030] In some embodiments, a first synchronous wheel can be sleeved on the output shaft of the reducer 212, and a second synchronous wheel coaxial with the screw 400 can be fixed on the screw 400, and a synchronous belt can be set between the first synchronous wheel and the second synchronous wheel. Through the transmission of the first synchronous wheel and the second synchronous wheel, the output shaft of the reducer 212 can also drive the screw 400 to rotate.

[0031] In this embodiment, reference Figure 1 and Figure 2 As shown, two guide rails are fixedly provided on the support frame 100. In order to distinguish them from the guide rails described below, they are referred to as first guide rails 130 in this embodiment. The length direction of the two first guide rails 130 is parallel to the axial direction of the lead screw 400 and are disposed on two opposite sides of the lead screw 400. The above-mentioned slide 500 is in the shape of a plate, and a first slider 510 capable of being on the two first guide rails 130 is fixedly provided on the bottom surface of the slide 500, so that the slide 500 can move along the axial direction of the lead screw 400 on the support frame 100. A nut seat 520 is fixedly provided on the slide 500, and the above-mentioned nut 600 screwed to the lead screw 400 is fixedly provided on the nut seat 520.

[0032] refer to Figure 1 and Figure 2 As shown, a grating displacement sensor 140 is provided on the support frame 100. The grating displacement sensor 140 is located on one side of the slide 500 and is used to detect the displacement of the slide 500, that is, the nut 600. It should be noted that the grating displacement sensor 140 can adopt an existing product, and its working principle is not described here. By setting the grating displacement sensor 140, the positioning accuracy and wear of the nut 600 can be detected.

[0033] In this embodiment, reference Figure 1 and Figure 2 As shown, two limit switches 150 are provided on the support frame 100, and relative to the side of the slide 500 where the grating displacement sensor 140 is provided, the two limit switches 150 are located on the other opposite side of the slide 500, and the two limit switches 150 can be triggered by the slide 500 respectively to limit the bidirectional displacement of the slide 500. It should be noted that the limit switch 150 can adopt an existing product, and its working principle is not repeated here. By setting the limit switch 150, when the slide 500 moves to trigger the limit switch 150, a signal can be sent to the rotational power output unit 220 to stop the power output of the rotational power output unit 220, that is, the limit switch 150 can constitute a soft limit on the movement of the slide 500, thereby improving the safety of the nut-screw pair loading test technology.

[0034] refer to Figure 1 As shown, the mounting seat 310 of this embodiment includes a vertical plate 311 which is provided on the support frame 100 and can be guided and slid, and a support plate 312 which is fixed to the bottom end of the vertical plate 311. A guide column 313 is fixed on the top surface of the support plate 312, and each counterweight block 320 is provided with a guide hole adapted to the guide column 313; each counterweight block 320 is stacked on the support plate 312, and the guide hole of each counterweight block 320 is sleeved on the guide column 313. In this embodiment, by providing the mounting seat 310 of the above structure, the counterweight block 320 can be conveniently stacked on the support plate 312, or the counterweight block 320 can be removed from the support plate 312, so that the load applied to the nut 600 can be conveniently adjusted.

[0035] refer to Figure 1 As shown, two guide rails are fixedly arranged on the support frame 100, which are called second guide rails 160 in this embodiment. The length direction of the two second guide rails 160 is parallel to the height direction of the support frame 100, and second sliders 314 that can slide on the two second guide rails 160 are fixedly arranged on the vertical plate 311. By providing the second guide rails 160 and the second sliders 314, the shaking of the mounting base 310 can be avoided.

[0036] In this embodiment, reference Figure 1As shown, the above-mentioned mounting seat 310 is connected to the slide seat 500 via a traction rope 700, and a first pulley 530 is rotatably provided on the slide seat 500, and the axial direction of the first pulley 530 is parallel to the height direction of the support frame 100, and two second pulleys 170 are rotatably provided on the support frame 100, and the axial directions of the two second pulleys 170 are perpendicular to the axial direction of the lead screw 400. One end of the traction rope 700 is fixedly connected to the mounting seat 310, and the other end passes through one of the two second pulleys 170, the first pulley 530 and the other of the two second pulleys 170 in sequence, and then is fixedly connected to the mounting seat 310.

[0037] In this embodiment, by setting the traction rope 700 in the above manner, compared with the case where the two ends of the two traction ropes 700 are respectively connected to the mounting seat 310 and the sliding seat 500, when the two ends of the two traction ropes 700 are respectively connected to the mounting seat 310 and the sliding seat 500, the two traction ropes 700 are not easy to align, and the mounting seat 310 not only applies an axial load to the nut 600, but also applies a radial load to the nut 600, affecting the test effect.

[0038] In some embodiments, reference Figure 3 and Figure 4 As shown, a plurality of counterweights 320 are stacked on the support frame 100, and two lifting assemblies 800 are disposed on the mounting seat 310 and are disposed on both sides of each counterweight 320. The lifting assemblies 800 include a first power unit, a second power unit, and a lifting plate. The lifting plate can be driven by the first power unit to rise or fall, and can be driven by the second power unit to be inserted between two adjacent counterweights, or to be removed from between two adjacent counterweights. That is to say, in this embodiment, the lifting plate can be inserted under the counterweight 320 of a predetermined weight, so that the counterweight 320 of a predetermined weight can be lifted when the lifting assembly 800 rises with the mounting seat 310, thereby applying a predetermined axial load to the nut 600. Compared with the aforementioned solution, the solution of this embodiment can automatically adjust the load applied to the nut 600, so that the nut screw pair can be conveniently subjected to a variable load test.

[0039] In this embodiment, reference Figure 4 As shown, each counterweight 320 includes a top plate 321 and two side plates 322 connected to both sides of the top plate 321 and extending downward, or in other words, each counterweight 320 is in the shape of a long strip, and the cross section of each counterweight 320 perpendicular to its own length direction is an inverted U-shape, so that the lifting plate can be inserted between two adjacent counterweights 320. Two guide rods 180 are fixed on the support frame 100, and guide through holes that can be mounted on the two guide rods 180 are respectively provided on each counterweight 320, so that each counterweight 320 has only the freedom to move up and down.

[0040] In this embodiment, the two lifting assemblies 800 have the same working principle, and this embodiment will take one of them as an example to introduce it. Figure 4 As shown, the first power unit includes a driving motor 810, an active bevel gear 811 and two reciprocating screws arranged on a mounting seat, and the two reciprocating screws are coaxially arranged up and down. For ease of understanding, the upper reciprocating screw is referred to as the first reciprocating screw 820, and the lower reciprocating screw is referred to as the second reciprocating screw 830 in the following description.

[0041] A first one-way bearing 821 is sleeved on the first reciprocating screw 820, and a first bevel gear 822 meshing with the active bevel gear 811 is sleeved on the first one-way bearing 821. A second one-way bearing 831 is sleeved on the second reciprocating screw 830, and a second bevel gear 832 meshing with the active bevel gear 811 is sleeved on the second one-way bearing 831. The working directions of the first one-way bearing 821 and the second one-way bearing 831 are opposite. It should be noted that the one-way bearing can adopt an existing product, and its structure and working principle are not described here. The active bevel gear 811 is sleeved on the motor shaft of the driving motor 810 so that it can be driven by the driving motor 810 to rotate.

[0042] A first sliding block 823 is screwed on the first reciprocating screw 820, and a second sliding block is screwed on the second reciprocating screw 830. The second power unit includes a first electric cylinder 824 arranged on the first sliding block 823, and a second electric cylinder arranged on the second sliding block. A first lifting plate 825 is fixed on the telescopic rod of the first electric cylinder 824, and a second lifting plate is fixed on the telescopic rod of the second electric cylinder.

[0043] The first sliding block 823 and the second sliding block are also provided with brakes, respectively, so that after the first sliding block 823 or the second sliding block moves into position, the corresponding brakes clamp the mounting seat 310, and the first sliding block 823 or the second sliding block is fixed on the mounting seat 310. The brake can be an existing product, and its structure and working principle are not described in detail here.

[0044] Based on the above structure, when the motor axis of the driving motor 810 rotates in one direction, it can drive the first reciprocating screw 820 to rotate, so that the first sliding block 823 rises or falls. When the output axis of the driving motor 810 rotates in the opposite direction, it can drive the second reciprocating screw 830 to rotate, so that the second sliding block rises or falls; that is, when the output axis of the driving motor 810 rotates in different directions, it can independently drive the first sliding block 823 and the second sliding block to rise or fall.

[0045] When the first sliding block 823 moves to a suitable position, the first electric cylinder 824 can push the first lifting plate 825 to insert the first lifting plate 825 under the predetermined counterweight 320. When the second sliding block moves to a suitable position, the second electric cylinder can push the second lifting plate to insert the second lifting plate under the predetermined counterweight 320.

[0046] In summary, in this embodiment, since the first lifting plate 825 and the second lifting plate can be independently raised and lowered, it is convenient for the lifting assembly 800 to lift the counterweights 320 of different weights to apply different axial loads to the nut 600. Compared with this solution, if there is only one lifting plate, when it is necessary to lift the counterweights 320 of different weights, the counterweights 320 must be lowered on the lifting plate before they can be moved up and down under other counterweights, which requires a long waiting time; while in this solution, when the first lifting plate 825 or the second lifting plate lifts the counterweight 320, the second lifting plate or the first lifting plate 825 can be moved to the position in advance, so the waiting time is shorter. Compared with the aforementioned solution of stacking the counterweights 320 on the mounting seat, it is inconvenient to manually increase or decrease the counterweights 320, while this solution can automatically increase or decrease the counterweights 320 used to apply loads to the nut 600, which is more convenient.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nut-screw pair loading test technology, characterized in that: include: Support frame; The test mechanism comprises a rotary power output unit and a slide seat, wherein the rotary power output unit is fixedly mounted on the support frame and used to drive the lead screw to be tested to rotate, the slide seat is mounted on the support frame and can slide on the support frame along the axial direction of the lead screw to be tested, and the slide seat is used to fix the nut to be tested; The load loading mechanism includes a mounting seat and a plurality of counterweight blocks. The mounting seat is connected to the slide seat and can be guided to rise and fall on the support frame. A plurality of counterweight blocks are stacked on the mounting seat. When the lead screw is driven by the rotary power output unit to rotate, the slide seat can slide along the axial direction of the lead screw and drive the mounting seat to rise or fall.

2. The nut-screw pair loading test technology according to claim 1 is characterized in that: The rotary power output unit includes a motor disposed on the support frame, and a reducer disposed on the support frame and connected to an output end of the motor.

3. The nut-screw pair loading test technology according to claim 2 is characterized in that: A driving gear is fixedly sleeved on the output shaft of the reducer, and a driven gear coaxial with and fixedly connected to the lead screw is provided on the lead screw, and the driven gear is meshed with the driving gear.

4. The nut-screw pair loading test technology according to claim 1 is characterized in that: A grating displacement sensor is provided on the support frame, and the grating displacement sensor is located on one side of the slide and is used to detect the displacement of the slide; relative to the side where the grating displacement sensor is provided, two limit switches are provided on the other opposite side of the slide, and the two limit switches can be triggered by the slide respectively to limit the bidirectional displacement of the slide.

5. The nut-screw pair loading test technology according to claim 1 is characterized in that: A support is provided on the support frame, and the fixed position of the support on the support frame can be adjusted along the axial direction of the lead screw, and the rotary power output unit is fixed on the support.

6. The nut-screw pair loading test technology according to claim 5 is characterized in that: The support frame is provided with a plurality of T-slots extending along the axial direction of the lead screw, and the support is provided with through holes respectively corresponding to the T-slots. Bolts can pass upward through the T-slots and the through holes and be screwed with connecting nuts to fix the support on the support frame.

7. The nut-screw pair loading test technology according to claim 1 is characterized in that: The mounting seat includes a vertical plate that can be slidably guided on the support frame, and a support plate fixedly mounted on the bottom end of the vertical plate; a guide column is fixedly mounted on the top surface of the support plate, and each of the counterweight blocks is stacked on the support plate, and each of the counterweight blocks is respectively provided with a guide hole that is sleeved on the guide column.

8. The nut-screw pair loading test technology according to claim 1 is characterized in that: A plurality of the counterweight blocks are stacked on the support frame; the mounting seat is provided with two lifting assemblies which are disposed on both sides of each of the counterweight blocks, and the two lifting assemblies respectively include a first power unit, a second power unit and a lifting plate, the lifting plate can be driven by the first power unit to rise or fall, and can be driven by the second power unit to be inserted between two adjacent counterweight blocks, or to be removed from between two adjacent counterweight blocks.

9. The nut-screw pair loading test technology according to claim 8, characterized in that: The first power unit includes a driving unit, an active bevel gear and two reciprocating screws arranged on the mounting seat. The two reciprocating screws are coaxially arranged up and down, and are respectively provided with one-way bearings. The working directions of the two one-way bearings are opposite, and the two one-way bearings are respectively provided with bevel gears; the active bevel gear is meshed with the two bevel gears and can be driven to rotate by the first power unit; sliding blocks are respectively screwed on the two reciprocating screws, and the second power unit and the lifting plate are respectively provided on the two sliding blocks.

10. The nut-screw pair loading test technology according to any one of claims 1 to 9, characterized in that: The mounting seat is connected to the sliding seat via a traction rope, the sliding seat is rotatably provided with a first pulley, the axial direction of the first pulley is parallel to the height direction of the support frame, and the support frame is rotatably provided with two second pulleys, the axial directions of the two second pulleys are perpendicular to the axial direction of the lead screw; one end of the traction rope is fixedly connected to the mounting seat, and the other end passes through one of the two second pulleys, the first pulley and the other of the two second pulleys in sequence, and then is fixedly connected to the mounting seat.

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