Lead screw efficiency testing device

By setting a fixed assembly and counterweight assembly in the screw test device, the problems of tension adjustment and axis accuracy in the existing device are solved, and the flexibility and accuracy of screw efficiency testing are achieved.

CN223192452UActive Publication Date: 2025-08-05SICHUAN AOTE ACCESSORIES REPAIR & MAINTENANCE CO LTD
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Patent Information

Application Number
CN202422552712.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-22
Publication Date
2025-08-05
Estimated Expiration
2034-10-22

AI Technical Summary

Technical Problem

The existing lead screw efficiency test devices are difficult to flexibly adjust the magnitude and direction of the applied tension, and cannot guarantee the accuracy of the lead screw axis position, resulting in large errors in the test results.

Method used

A lead screw efficiency test device is designed. By setting the screw tail fixing assembly, the head end fixing assembly and the clamping assembly on the test bench, and using the counterweight assembly to apply tension on the left and right sides of the lead screw, combined with the driving reducer and torque sensor, flexible adjustment of the applied force on the lead screw and precise positioning of the axis to ensure the accuracy of the test.

Benefits of technology

It realizes flexible and efficient testing of lead screw efficiency under different loads, ensuring the accuracy and reliability of test results and reducing errors.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a lead screw efficiency testing device, which comprises a testboard and a lead screw, a lead screw tail end fixing assembly and a lead screw head end fixing assembly are arranged at the left end and the right end of the top surface of the testboard, and a lead screw clamping assembly is arranged between the lead screw tail end fixing assembly and the lead screw head end fixing assembly in a sliding manner; a driving speed reducer is arranged at the end, away from the lead screw clamping assembly, of the lead screw head end fixing assembly, the head end of the lead screw is in transmission connection with an output shaft of the driving speed reducer through the lead screw head end fixing assembly, and a torque sensor is arranged at the position of the output shaft of the driving speed reducer. A first counterweight assembly and a second counterweight assembly are arranged at the left end and the right end of the test board respectively, the first counterweight assembly is connected with the left side of the lead screw clamping assembly, and the second counterweight assembly is connected with the right side of the lead screw clamping assembly; according to the utility model, on the premise of ensuring the precision of the axis position of the lead screw, the direction and magnitude of the acting force applied to the lead screw can be flexibly adjusted, so that the lead screw efficiency under different loads can be flexibly and efficiently tested.
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Description

Technical Field

[0001] The utility model belongs to the technical field of screw transmission testing and relates to a screw efficiency testing device. Background Art

[0002] Before a screw is actually assembled and used, its efficiency needs to be tested. Existing screw efficiency testing devices apply a tensile or thrust force to the end of the screw while simultaneously rotating it with a motor. The torque of the screw under load is then tested to reflect the efficiency of the screw. However, existing screw efficiency testing devices are difficult to flexibly adjust in terms of the magnitude and direction of the tensile or thrust force applied to the screw. Furthermore, existing screw efficiency testing devices cannot guarantee the accuracy of the screw's axial position during the test, resulting in errors in the final test results.

[0003] Therefore, in view of the above-mentioned deficiencies of the existing screw efficiency testing device, the utility model discloses a screw efficiency testing device. Utility Model Content

[0004] The purpose of the utility model is to provide a screw efficiency testing device, which can flexibly adjust the direction and magnitude of the force applied to the screw while ensuring the accuracy of the screw axis position, and thus flexibly and efficiently test the screw efficiency under different loads.

[0005] The utility model is achieved through the following technical solutions:

[0006] A screw efficiency testing device comprises a test bench and a screw, wherein a screw tail end fixing assembly and a screw head end fixing assembly are coaxially arranged at the left and right ends of the top surface of the test bench, and a screw clamping assembly is linearly slidingly arranged between the screw tail end fixing assembly and the screw head end fixing assembly; a driving reducer is arranged at the end of the screw head end fixing assembly away from the screw clamping assembly, and the head end of the screw is transmission-connected to the output shaft of the driving reducer through the screw head end fixing assembly, and a torque sensor is arranged at the output shaft of the driving reducer; a first counterweight assembly and a second counterweight assembly are respectively arranged at the left and right ends of the test bench, the first counterweight assembly is connected to the left side of the screw clamping assembly, and the second counterweight assembly is connected to the right side of the screw clamping assembly.

[0007] The screw to be tested is clamped in the middle of the screw using a screw clamping assembly, and the screw clamping assembly is linearly slid so that the head end of the screw is connected to the screw head end fixing assembly, and the tail end of the screw is connected to the screw tail end fixing assembly, thereby achieving the positioning of the screw so that the axis of the screw is horizontal and coaxial with the axis of the output shaft of the drive reducer. The head end of the screw is then connected to the output shaft of the drive reducer, and the counterweights of the first and second counterweight assemblies on the left and right sides are adjusted. The first counterweight assembly applies a first horizontal tension to the left on the left side of the screw clamping assembly, and the second counterweight assembly applies a second horizontal tension to the right on the right side of the screw clamping assembly. The resultant force between the first and second tensions is the final test tension applied to the screw. By adjusting the weight of the first and second counterweight assemblies, the magnitude and direction of the final resultant force applied to the screw can be flexibly adjusted. Under the premise that the screw is subjected to the test tension, the screw is then driven to rotate by the reducer, and the torque of the output shaft of the drive reducer is detected in real time by the torque sensor, so that the torque of the screw under the force condition can be further calculated.

[0008] In order to better realize the present utility model, further, the first counterweight assembly includes a first counterweight pulley group, a first counterweight block, and a first connecting cable. The first counterweight pulley group is arranged on the left side of the screw clamping assembly, the first connecting cable is wound around the first counterweight pulley group, the counterweight of the first connecting cable is connected to the first counterweight block, and the force-applying end of the first connecting cable is horizontally connected to the left side of the screw clamping assembly.

[0009] In order to better implement the present invention, further, the force-applying axis of the force-applying end of the first connecting cable is coaxially arranged with the axis of the lead screw.

[0010] In order to better realize the present utility model, further, the second counterweight assembly includes a second counterweight pulley group, a second counterweight block, and a second connecting cable. The second counterweight pulley group is arranged on the right side of the screw clamping assembly, and the second connecting cable is wound around the second counterweight pulley group. The counterweight end of the second connecting cable is connected to the second counterweight block, and the force-applying end of the second connecting cable is horizontally connected to the right side of the screw clamping assembly.

[0011] In order to better implement the present invention, further, the force application axis of the force application end of the second connecting cable is coaxially arranged with the axis of the screw.

[0012] In order to better realize the present invention, further, the top surface of the test bench is located between the screw tail end fixing assembly and the screw head end fixing assembly, and a slide rail is provided along the direction parallel to the screw axis, and the bottom of the screw clamping assembly is connected to the slide rail through a slider for sliding cooperation.

[0013] In order to better realize the present utility model, further, the screw tail end fixing assembly includes a tail end fixing seat, a tail end clamping sleeve, a handwheel, and a locking block. The tail end fixing seat is provided with a fixing hole, and a tail end clamping sleeve is rotatably provided in the fixing hole. A handwheel is provided at the end of the tail end clamping sleeve away from the screw clamping assembly, and a tail end clamping hole is provided at the end of the tail end clamping sleeve close to the screw clamping assembly. A locking block is provided on one side of the tail end clamping hole for sliding in the vertical direction, and an extrusion arc surface is provided on the top side of the locking block for cooperating and contacting with the outer side surface of the tail end clamping hole.

[0014] In order to better realize the present utility model, further, the screw head end fixing assembly includes a head end fixing seat, a head end clamping sleeve, and a coupling sleeve. The head end fixing seat is provided with a fixing hole, and a head end clamping sleeve is rotatably arranged in the fixing hole. The end of the head end clamping sleeve away from the screw clamping assembly is connected to the output shaft of the driving reducer through the coupling sleeve, and the end of the head end clamping sleeve close to the screw clamping assembly is provided with a head end clamping hole.

[0015] In order to better realize the present utility model, further, the screw clamping assembly includes a clamping seat, a clamping sleeve, and a tightening bolt. A clamping sleeve is provided on the top of the clamping seat, a clamping hole is provided on the clamping sleeve, and a tightening bolt is threadedly installed on the hole wall of the clamping hole. The axis of the tightening bolt is arranged perpendicular to the axis of the clamping sleeve.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] The utility model respectively provides a screw head end fixing component, a screw clamping component and a screw tail end fixing component for the head end, middle part and tail end of the screw, so as to achieve stable support and positioning of the head end, middle part and tail end of the screw, and ensure that the axis of the screw is in a horizontal state and coaxial with the axis of the output shaft of the driving reducer during the test, and at the same time limits the axial movement of the screw, thereby ensuring the accuracy of the subsequent torque measurement under the screw load; at the same time, the utility model also provides a first counterweight component and a second counterweight component on the left and right sides of the screw clamping component, and applies a first pulling force to the left to the screw through the first counterweight component, and applies a second pulling force to the right to the screw through the second counterweight component, and flexibly adjusts the size of the first pulling force and the second pulling force by adjusting the weight of the first counterweight component and the second counterweight component in real time, and finally realizes flexible adjustment of the size and direction of the test pulling force on the screw, thereby realizing torque testing of the screw under different pulling loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the screw efficiency testing device;

[0019] Figure 2 It is a cross-sectional view of the screw tail end fixing assembly;

[0020] Figure 3 This is a schematic diagram of the installation of the locking block inside the screw tail end fixing assembly;

[0021] Figure 4 It is a structural diagram of the screw head end fixing assembly;

[0022] Figure 5 It is a structural diagram of the screw clamping assembly;

[0023] Figure 6 The figure below shows the installation diagram of the tightening bolts.

[0024] Among them: 1-test bench; 2-screw tail end fixing assembly; 3-screw head end fixing assembly; 4-screw clamping assembly; 5-drive reducer; 6-torque sensor; 7-slide rail; 21-tail end fixing seat; 22-tail end clamping sleeve; 23-handwheel; 24-locking block; 31-head end fixing seat; 32-head end clamping sleeve; 33-coupling sleeve; 41-clamping seat; 42-clamping sleeve; 43-tightening bolt; 100-first counterweight assembly; 200-second counterweight assembly; 101-first counterweight pulley group; 102-first counterweight block; 103-first connecting cable; 201-second counterweight pulley group; 202-second counterweight block; 203-second connecting cable. DETAILED DESCRIPTION

[0025] The following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise expressly specified in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] For the convenience of description, if the words "up", "down", "left" and "right" appear in this utility model, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the utility model.

[0028] Explanation of terms: The terms "install", "connect", "connect", "fix" and so on in this utility model should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, a direct connection or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0029] Example 1:

[0030] A screw efficiency testing device of this embodiment, such as Figure 1 As shown, it includes a test bench 1 and a screw, and the left and right ends of the top surface of the test bench 1 are coaxially provided with a screw tail end fixing component 2 and a screw head end fixing component 3, and a screw clamping component 4 is linearly slidingly provided between the screw tail end fixing component 2 and the screw head end fixing component 3; a driving reducer 5 is provided at the end of the screw head end fixing component 3 away from the screw clamping component 4, and the head end of the screw is connected to the output shaft of the driving reducer 5 through the screw head end fixing component 3, and a torque sensor 6 is provided at the output shaft of the driving reducer 5; a first counterweight component 100 and a second counterweight component 200 are respectively provided at the left and right ends of the test bench 1, the first counterweight component 100 is connected to the left side of the screw clamping component 4, and the second counterweight component 200 is connected to the right side of the screw clamping component 4.

[0031] The middle position of the screw is clamped and fixed by the screw clamping assembly 4, and at the same time, the screw clamping assembly 4 is slid between the screw tail end fixing assembly 2 and the screw head end fixing assembly 3, so that the head end of the screw is coaxially docked with the screw head end fixing assembly 3, and the tail end of the screw is coaxially docked with the screw tail end fixing assembly 2, and the head end and tail end of the screw are clamped and fixed by the screw tail end fixing assembly 2 and the screw head end fixing assembly 3, so that the axis of the screw is horizontal and coaxial with the axis of the output shaft of the drive reducer 5, and the axial movement of the screw is limited by the screw tail end fixing assembly 2 and the screw head end fixing assembly 3, so that the screw can only rotate circumferentially to ensure the accuracy of subsequent torque measurement results.

[0032] The first counterweight assembly 100 is connected to the left side of the screw clamping assembly 4, and a first horizontal pulling force to the left is applied to the screw clamping assembly 4 through the first counterweight assembly 100. The second counterweight assembly 200 is connected to the right side of the screw clamping assembly 4, and a second horizontal pulling force to the right is applied to the screw clamping assembly 4 through the second counterweight assembly 200. By adjusting the actual counterweights of the first counterweight assembly 100 and the second counterweight assembly 200, the magnitude of the first pulling force and the second pulling force can be adjusted, and the magnitude and direction of the test pulling force ultimately applied to the screw clamping assembly 4 can be flexibly adjusted. For example, if the first pulling force is greater than the second pulling force, the final test pulling force is the first pulling force minus the second pulling force, and the direction of the test pulling force is the same as the direction of the first pulling force.

[0033] Then, the reducer 5 is driven to drive the lead screw to rotate under the force state, and the torque applied to the lead screw is detected in real time by the torque sensor 6, thereby completing the torque efficiency test when the lead screw rotates under different force conditions.

[0034] Example 2:

[0035] A screw efficiency testing device is improved on the basis of Example 1, such as Figure 1 As shown, the first counterweight assembly 100 includes a first counterweight pulley group 101, a first counterweight block 102, and a first connecting cable 103. The first counterweight pulley group 101 is arranged on the left side of the screw clamping assembly 4, and the first connecting cable 103 is wound around the first counterweight pulley group 101. The counterweight of the first connecting cable 103 is connected to the first counterweight block 102, and the force-applying end of the first connecting cable 103 is horizontally connected to the left side of the screw clamping assembly 4.

[0036] The first counterweight pulley assembly 101 includes several fixed pulleys arranged on the left side of the test bench 1. The first connecting cable 103 is wound around the fixed pulleys. By setting the position of the fixed pulleys, the axis of the counterweight end of the first connecting cable 103 is plumb, and the axis of the force-applying end of the first connecting cable 103 is horizontal. The counterweight end of the first connecting cable 103 is provided with a hook for conveniently hooking the first counterweight block 102. The force-applying end of the first connecting cable 103 is provided with a latch. The left side of the screw clamping assembly 4 is provided with a lock sleeve that plugs into the latch, and the side wall of the lock sleeve and the latch are provided with corresponding lock holes. By inserting the latch into the lock sleeve and inserting the lock pin into the aligned lock hole, the force-applying end of the first connecting cable 103 can be conveniently connected to the left side of the screw clamping assembly 4.

[0037] Furthermore, the force application axis of the force application end of the first connecting cable 103 is coaxially arranged with the axis of the lead screw.

[0038] The rest of this embodiment is the same as that of embodiment 1, so it will not be described again.

[0039] Example 3:

[0040] A screw efficiency testing device is improved on the basis of embodiment 1 or 2, such as Figure 1 As shown, the second counterweight assembly 200 includes a second counterweight pulley group 201, a second counterweight block 202, and a second connecting cable 203. The second counterweight pulley group 201 is arranged on the right side of the screw clamping assembly 4, and the second connecting cable 203 is wound around the second counterweight pulley group 201. The counterweight end of the second connecting cable 203 is connected to the second counterweight block 202, and the force-applying end of the second connecting cable 203 is horizontally connected to the right side of the screw clamping assembly 4.

[0041] The second counterweight pulley assembly 201 includes several fixed pulleys disposed on the right side of the test bench 1. The second connecting cable 203 is wound around these fixed pulleys. By positioning the fixed pulleys, the axis of the counterweight end of the second connecting cable 203 is plumb, and the axis of the force-applying end of the second connecting cable 203 is horizontal. The counterweight end of the second connecting cable 203 is provided with a hook for conveniently attaching the second counterweight block 202. The force-applying end of the second connecting cable 203 is provided with a latch. The right side of the screw clamping assembly 4 is provided with a locking sleeve that plugs into the latch, and the sidewalls of the locking sleeve and the latch are provided with corresponding lock holes. By inserting the latch into the locking sleeve and inserting the locking pin into the aligned lock holes, the force-applying end of the second connecting cable 203 can be conveniently connected to the right side of the screw clamping assembly 4.

[0042] Furthermore, the force application axis of the force application end of the second connecting cable 203 is coaxially arranged with the axis of the lead screw.

[0043] The rest of this embodiment is the same as that of embodiment 1 or 2, and thus will not be described in detail.

[0044] Example 4:

[0045] A screw efficiency testing device, improved on the basis of any one of embodiments 1-3, such as Figure 1 As shown, the top surface of the test bench 1 is located between the screw tail end fixing component 2 and the screw head end fixing component 3, and a slide rail 7 is provided in a direction parallel to the screw axis. The bottom of the screw clamping component 4 is slidably connected to the slide rail 7 through a slider.

[0046] The slide rail 7 is arranged parallel to the axis of the screw. Through the sliding cooperation between the slider and the slide rail 7, the position of the screw clamping assembly 4 between the screw tail end fixing assembly 2 and the screw head end fixing assembly 3 can be flexibly adjusted.

[0047] The rest of this embodiment is the same as any one of Embodiments 1-3, so it will not be described again.

[0048] Example 5:

[0049] A screw efficiency testing device, improved on the basis of any one of embodiments 1-4, such as Figure 2 and Figure 3 As shown, the screw tail end fixing assembly 2 includes a tail end fixing seat 21, a tail end clamping sleeve 22, a handwheel 23, and a locking block 24. A fixing hole is provided on the tail end fixing seat 21, and a tail end clamping sleeve 22 is rotatably provided in the fixing hole. A handwheel 23 is provided at the end of the tail end clamping sleeve 22 away from the screw clamping assembly 4, and a tail end clamping hole is provided at the end of the tail end clamping sleeve 22 close to the screw clamping assembly 4. A locking block 24 is provided on one side of the tail end clamping hole for sliding in the vertical direction, and an extrusion arc surface is provided on the top side of the locking block 24 for cooperating and contacting with the outer side surface of the tail end clamping hole.

[0050] A vertical slot is provided on one side of the tail end clamping hole, and a locking block 24 is slidably mounted within the slot. A locking wrench is threaded onto the top of the locking block 24. Turning the locking wrench causes the locking block 24 to slide up and down within the slot. When the locking block 24 slides upward, the extrusion arc presses against the outer surface of the tail end clamping hole, causing the hole to contract and secure the screw end inserted into the hole. Turning the handwheel 23 rotates the tail end clamping sleeve 22 to adjust its position.

[0051] The rest of this embodiment is the same as any one of Embodiments 1-4, and therefore will not be described in detail.

[0052] Example 6:

[0053] A screw efficiency testing device, improved on the basis of any one of embodiments 1-5, such as Figure 4 As shown, the screw head end fixing assembly 3 includes a head end fixing seat 31, a head end clamping sleeve 32, and a coupling sleeve 33. A fixing hole is provided on the head end fixing seat 31, and a head end clamping sleeve 32 is rotatably provided in the fixing hole. The end of the head end clamping sleeve 32 away from the screw clamping assembly 4 is transmission-connected to the output shaft of the driving reducer 5 through the coupling sleeve 33, and the end of the head end clamping sleeve 32 close to the screw clamping assembly 4 is provided with a head end clamping hole.

[0054] A head end clamping sleeve 32 is rotatably mounted inside the fixing hole via a bearing assembly. A coupling sleeve 33 is coaxially connected to the end of the head end clamping sleeve 32 away from the screw clamping assembly 4. The coupling sleeve 33 is connected to the output shaft of the drive reducer 5. A head end clamping hole is provided at the end of the head end clamping sleeve 32 close to the screw clamping assembly 4. The head end clamping hole is plugged into the head end of the screw.

[0055] The rest of this embodiment is the same as any one of Embodiments 1-5, so it will not be described again.

[0056] Example 7:

[0057] A screw efficiency testing device, improved on the basis of any one of embodiments 1-6, such as Figure 5 and Figure 6 As shown, the screw clamping assembly 4 includes a clamping seat 41, a clamping sleeve 42, and a tightening bolt 43. A clamping sleeve 42 is provided on the top of the clamping seat 41, a clamping hole is provided on the clamping sleeve 42, and a tightening bolt 43 is threadedly installed on the hole wall of the clamping hole. The axis of the tightening bolt 43 is perpendicular to the axis of the clamping sleeve 42.

[0058] The middle part of the lead screw passes through the clamping hole on the clamping sleeve 42. A threaded hole is provided on the wall of the clamping hole along the radial direction of the clamping hole. A tightening bolt 43 is installed in the threaded hole. By screwing the tightening bolt 43, the tightening bolt 43 tightens the side of the lead screw inside the clamping hole, thereby fixing the lead screw.

[0059] Furthermore, in order to prevent the tightening bolt 43 from damaging the lead screw, a rubber pad is provided at the tightening end of the tightening bolt 43 .

[0060] The rest of this embodiment is the same as any one of Embodiments 1-6, and therefore will not be described in detail.

[0061] The above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the present invention.

Claims

1. A screw efficiency testing device, comprising a test bench (1) and a screw, characterized in that: The left and right ends of the top surface of the test bench (1) are coaxially provided with a screw tail end fixing component (2) and a screw head end fixing component (3), and a screw clamping component (4) is linearly slidably provided between the screw tail end fixing component (2) and the screw head end fixing component (3); a driving reducer (5) is provided at one end of the screw head end fixing component (3) away from the screw clamping component (4), and the head end of the screw is connected to the output shaft of the driving reducer (5) through the screw head end fixing component (3), and a torque sensor (6) is provided at the output shaft of the driving reducer (5); the left and right ends of the test bench (1) are respectively provided with a first counterweight component (100) and a second counterweight component (200), the first counterweight component (100) is connected to the left side of the screw clamping component (4), and the second counterweight component (200) is connected to the right side of the screw clamping component (4).

2. A screw efficiency testing device according to claim 1, characterized in that: The first counterweight assembly (100) comprises a first counterweight pulley assembly (101), a first counterweight block (102), and a first connecting cable (103); the first counterweight pulley assembly (101) is arranged on the left side of the screw clamping assembly (4); the first connecting cable (103) is wound around the first counterweight pulley assembly (101); the counterweight of the first connecting cable (103) is connected to the first counterweight block (102); and the force-applying end of the first connecting cable (103) is horizontally connected to the left side of the screw clamping assembly (4).

3. A screw efficiency testing device according to claim 2, characterized in that: The force application axis of the force application end of the first connecting cable (103) is coaxially arranged with the axis of the lead screw.

4. A screw efficiency testing device according to claim 1, characterized in that: The second counterweight assembly (200) comprises a second counterweight pulley block (201), a second counterweight block (202), and a second connecting cable (203); the second counterweight pulley block (201) is arranged on the right side of the screw clamping assembly (4); the second connecting cable (203) is wound around the second counterweight pulley block (201); the counterweight end of the second connecting cable (203) is connected to the second counterweight block (202); and the force-applying end of the second connecting cable (203) is horizontally connected to the right side of the screw clamping assembly (4).

5. A screw efficiency testing device according to claim 4, characterized in that: The force application axis of the force application end of the second connecting cable (203) is coaxially arranged with the axis of the lead screw.

6. A screw efficiency testing device according to any one of claims 1 to 5, characterized in that: The top surface of the test bench (1) is located between the screw tail end fixing assembly (2) and the screw head end fixing assembly (3), and a slide rail (7) is provided in a direction parallel to the screw axis. The bottom of the screw clamping assembly (4) is slidably connected to the slide rail (7) via a slider.

7. A screw efficiency testing device according to any one of claims 1 to 5, characterized in that: The screw tail end fixing assembly (2) includes a tail end fixing seat (21), a tail end clamping sleeve (22), a hand wheel (23), and a locking block (24). The tail end fixing seat (21) is provided with a fixing hole, and the tail end clamping sleeve (22) is rotatably provided in the fixing hole. The end of the tail end clamping sleeve (22) away from the screw clamping assembly (4) is provided with a hand wheel (23), and the end of the tail end clamping sleeve (22) close to the screw clamping assembly (4) is provided with a tail end clamping hole. A locking block (24) is provided on one side of the tail end clamping hole for sliding in a vertical direction, and an extrusion arc surface is provided on one side of the top of the locking block (24) for contacting with the outer side surface of the tail end clamping hole.

8. A screw efficiency testing device according to any one of claims 1 to 5, characterized in that: The screw head end fixing assembly (3) comprises a head end fixing seat (31), a head end clamping sleeve (32), and a coupling sleeve (33); the head end fixing seat (31) is provided with a fixing hole, and the head end clamping sleeve (32) is rotatably provided in the fixing hole; the end of the head end clamping sleeve (32) away from the screw clamping assembly (4) is transmission-connected to the output shaft of the driving reducer (5) through the coupling sleeve (33); the end of the head end clamping sleeve (32) close to the screw clamping assembly (4) is provided with a head end clamping hole.

9. A screw efficiency testing device according to any one of claims 1 to 5, characterized in that: The screw clamping assembly (4) comprises a clamping seat (41), a clamping sleeve (42), and a tightening bolt (43). The top of the clamping seat (41) is provided with a clamping sleeve (42), the clamping sleeve (42) is provided with a clamping hole, and the wall of the clamping hole is threadedly fitted with a tightening bolt (43), and the axis of the tightening bolt (43) is perpendicular to the axis of the clamping sleeve (42).