An internal spline testing device for testing steering gear screws

Abstract

This invention discloses an internal spline testing device for steering gear screws, relating to the field of screw component testing technology. It includes a main body, a slide rail and a fixed frame disposed above the main body; a transport mechanism slidably connected inside the slide rail, the transport mechanism including a first sliding frame and a second sliding frame slidably connected inside the slide rail, and a cylinder installed inside the slide rail, the telescopic end of the cylinder being connected to the first sliding frame; and a testing mechanism slidably connected inside the fixed frame, the testing mechanism including a second slide groove formed inside the fixed frame, a second sliding plate slidably connected inside the second slide groove, and a detector connected to the second sliding plate, the cylinder driving the first and second sliding frames to move below the detector. This internal spline testing device for steering gear screws, by incorporating the transport mechanism and the testing mechanism, achieves the goal of improving the efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of screw component testing technology, specifically to an internal spline testing device for steering gear screw testing. Background Technology

[0002] The internal spline is a critical torque transmission structure on the screw shaft, and its geometric accuracy directly affects the fitting performance and lifespan of the screw pair. The deep integration of intelligent sensors with internal spline detection completely changes the traditional passive mode that relies on manual visual inspection or gauge sampling. By embedding intelligent sensing elements such as micro-laser displacement, eddy current, or fiber optic gratings into the detection fixture or machining spindle, the system can dynamically capture the contour deviation, cumulative pitch error, and radial runout of each tooth surface of the internal spline while the screw is rotating at high speed or axially fed, and automatically filter out environmental interference such as oil contamination and temperature drift.

[0003] Utility model patent CN218822003U discloses an internal spline detector for screw components. By rotating a motor, the clamped threaded component is always held at the bottom of the detection rod. This motor design avoids the need for repeated adjustments to the nut and bolt clamping process found in existing methods. However, when detecting internal splines, because the steering screw is not vertical, the external and internal splines are difficult to align, leading to frictional damage. Summary of the Invention

[0004] To overcome the problem that during the inspection of internal splines, the steering gear screw is not in a vertical direction, which easily leads to misalignment between the external and internal splines, resulting in frictional damage, this invention provides an internal spline inspection device for steering gear screw inspection, including a body, and further comprising: The slide rails and mounting brackets are located on the top of the machine body; A transport mechanism slidably connected inside a slide rail, the transport mechanism including a first sliding frame and a second sliding frame slidably connected inside the slide rail, and a cylinder installed inside the slide rail, the telescopic end of the cylinder being connected to the first sliding frame; A detection mechanism is slidably connected inside a fixed frame. The detection mechanism includes a second slide groove opened inside the fixed frame, a second slide plate slidably connected inside the second slide groove, and a detector connected to the second slide plate. The cylinder is used to drive the first slide frame and the second slide frame to move below the detector.

[0005] Preferably, the transportation mechanism further includes: A first push rod is installed outside the first sliding frame. The telescopic end of the first push rod is connected to the second sliding frame. The first push rod is used to adjust the distance between the first sliding frame and the second sliding frame. The base plate is located outside the first sliding frame, and the limiting groove is located inside the base plate.

[0006] Preferably, the transportation mechanism further includes: Adjustment rods are installed inside the first sliding frame and the second sliding frame; Contact plate installed on the outside of the adjusting rod.

[0007] Preferably, the testing mechanism further includes: The first slide groove is formed inside the fixed frame; The first sliding plate is slidably connected inside the first sliding groove.

[0008] Preferably, the testing mechanism further includes: The second push rod is mounted on the first sliding plate; The connecting frame is set on the telescopic end of the second push rod, and the central cylinder is installed inside the connecting frame. The second push rod is used to adjust the distance between the connecting frame and the fixed frame.

[0009] Preferably, the testing mechanism further includes: The connecting pipe installed below the central cylinder and the cover plate connected to the connecting pipe; A passageway opened inside the cover plate; Inclined tubes and protrusions installed on the outside of the cover plate.

[0010] Preferably, the testing mechanism further includes: The motor located below the central cylinder and the third push rod connected to the motor output end; The connecting cylinder is located on the telescopic end of the third push rod, which is used to drive the connecting cylinder to move up and down within the cover plate.

[0011] Preferably, the testing mechanism further includes: A branch pipe installed outside the connecting pipe, the branch pipe being connected to the connecting cylinder; The external spline located inside the connecting cylinder and the through groove located inside the external spline; An outer ring fitted around the outside of the outer spline.

[0012] Preferably, the testing mechanism further includes: The fourth push rod installed inside the connecting cylinder and the central tube connected to the telescopic end of the fourth push rod; The probe, installed below the central tube, is controlled by the fourth push rod to enter the through slot inside the external spline.

[0013] This invention provides an internal spline testing device for testing steering gear screws. It has the following advantages: 1. This steering gear screw internal spline testing equipment, through the installation of a transport mechanism and a detector, checks whether the steering gear screw under test is in a vertical direction. In existing steering gear screw internal spline testing equipment, when the steering gear screw is not in a vertical direction, it is easy for the external and internal splines to align poorly, leading to frictional damage. Therefore, by installing a transport mechanism and a detector, after limiting the steering gear screw, the detector checks whether the steering gear screw is in a vertical direction. Workers can then correct any improperly positioned steering gear screws to avoid the aforementioned problems.

[0014] 2. This steering gear screw testing equipment for internal spline testing uses a transport mechanism to confine the steering gear screw under test between multiple symmetrically arranged semi-annular contact plates at different heights, thereby controlling the steering gear screw under test to be in a vertical direction. Simultaneously, the bottom of the steering gear screw under test is positioned within a limiting groove, thus reducing wobbling during installation.

[0015] 3. This steering gear screw internal spline testing equipment, through the setting of a testing mechanism, uses a suction method to clean the external spline, preventing excessive impurities on the external spline from entering the internal spline, which could cause friction on the internal spline or make it difficult for the external spline to enter the internal spline. At the same time, a negative pressure suction method promotes the external spline to be firmly placed in the connecting cylinder.

[0016] 4. This steering gear screw testing equipment for internal splines uses a testing mechanism to first check whether the external spline can enter the internal spline. Before mating, the external spline is adjusted to several different heights, allowing workers to observe whether it can smoothly enter the internal spline. If the dimensional differences are too large, the third push rod is adjusted to its initial stroke to avoid excessive frictional damage. A probe is then used to perform internal contact testing on the internal spline, ensuring that the internal parameters of the internal spline cannot be determined solely by testing the external spline mating. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the transportation mechanism of the present invention; Figure 3 This is a schematic diagram of the detection mechanism of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the connecting frame of the present invention; Figure 6 This is a structural schematic diagram of the connecting frame of the present invention from another perspective; Figure 7 This is a schematic diagram of the structure of the cover plate of the present invention; Figure 8 This is a cross-sectional view of the connecting cylinder of the present invention.

[0018] In the diagram: 1. Body; 2. Slide rail; 3. Transport mechanism; 301. Cylinder; 302. First sliding frame; 303. Second sliding frame; 304. First push rod; 305. Adjusting rod; 306. Contact plate; 307. Base plate; 308. Limiting groove; 4. Fixing frame; 5. Detection mechanism; 501. First slide groove; 502. Second slide groove; 503. First sliding plate; 504. Second push rod; 505. Connecting frame; 506. Second sliding plate; 507. Detector; 508. Central cylinder; 509. Connecting pipe; 510. Cover plate; 511. Motor; 512. Third push rod; 513. Channel; 514. Inclined tube; 515. Protrusion; 516. Branch pipe; 517. Connecting cylinder; 518. External spline; 519. Outer ring; 520. Fourth push rod; 521. Central tube; 522. Probe. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figures 1-8 As shown, the present invention provides a technical solution: an internal spline testing device for testing steering gear screws is described below.

[0021] Including body 1, it also includes: The slide rail 2 and the mounting bracket 4 are located on the upper part of the body 1; The transport mechanism 3 is slidably connected inside the slide rail 2. The transport mechanism 3 includes a first sliding frame 302 and a second sliding frame 303 slidably connected inside the slide rail 2, and a cylinder 301 installed inside the slide rail 2. The telescopic end of the cylinder 301 is connected to the first sliding frame 302. The detection mechanism 5 is slidably connected inside the fixed frame 4. The detection mechanism 5 includes a second slide groove 502 opened inside the fixed frame 4, a second sliding plate 506 slidably connected inside the second slide groove 502, and a detector 507 connected to the second sliding plate 506. The cylinder 301 is used to drive the first sliding frame 302 and the second sliding frame 303 to move below the detector 507. An electric push rod is provided in the second slide groove 502, which drives the second sliding plate 506 and the detector 507 to move. The detector 507 is set as a dual laser displacement sensor to detect whether the steering screw to be tested is in the vertical direction.

[0022] Before using the equipment, the worker manually places the cleaned steering gear screw to be tested into the transport mechanism 3. The transport mechanism 3 clamps and fixes the steering gear screw to be tested and transports it to the area below the detector 507. The detector 507 checks whether the steering gear screw to be tested is in the vertical direction. If the steering gear screw to be tested is in the vertical direction, the detection mechanism 5 is adjusted to check the internal spline of the steering gear screw. If the steering gear screw to be tested is not in the vertical direction, the worker adjusts the transport mechanism 3 to recalibrate the position of the steering gear screw and repeats the above actions to check the internal spline of the steering gear screw.

[0023] Transportation agency 3 also includes: The first push rod 304 is installed outside the first sliding frame 302. The telescopic end of the first push rod 304 is connected to the second sliding frame 303. The first push rod 304 is configured as an electric push rod. A detachable base plate 307 is disposed outside the first sliding frame 302, and a limiting groove 308 is opened inside the base plate 307. The limiting groove 308 is circular in shape. An adjusting rod 305 is provided inside the first sliding frame 302 and the second sliding frame 303. The adjusting rod 305 is a rod whose length can be manually adjusted. A detachable contact plate 306 is installed on the outside of the adjusting rod 305. The contact plate 306 is set in a semi-circular shape and is made of rubber. The contact plate 306 of the corresponding size is selected according to the shape of the steering gear screw to be tested.

[0024] The working process of using transport mechanism 3 to clamp and fix the steering gear screw under test: The first push rod 304 is activated, which drives the second sliding frame 303 to move away from the first sliding frame 302. Then, the worker manually places the steering gear screw to be tested into the limiting groove 308 of the base plate 307, with the end of the steering gear screw to be tested with the internal spline facing upward.

[0025] Then, the stroke of the first push rod 304 is adjusted, and the first push rod 304 drives the second sliding frame 303 to move closer to the first sliding frame 302. Multiple sets of contact plates 306 on both sides contact and clamp the steering gear screw under test, and perform clamping and limiting work on the steering gear screw under test at different heights.

[0026] The process of adjusting the position of the steering gear screw under test using transportation mechanism 3: After the limit operation is completed, cylinder 301 is activated. Cylinder 301 drives the first sliding frame 302, the first push rod 304 and the second sliding frame 303 to move downwards towards detector 507, thereby driving the steering gear screw under test to move downwards towards detector 507. Detector 507 then detects whether the steering gear screw under test is in the vertical direction.

[0027] After the test is passed, cylinder 301 is started, which drives the first sliding frame 302, the first push rod 304, the second sliding frame 303, and the steering screw under test to move towards the test point of the internal spline.

[0028] The working process of releasing the steering gear screw under test using transportation mechanism 3: After the internal spline test is completed, adjust cylinder 301. Cylinder 301 drives the first sliding frame 302, the second sliding frame 303, and the tested steering gear screw back to their initial positions. Start the first push rod 304. The first push rod 304 drives the second sliding frame 303 away from the first sliding frame 302. The tested steering gear screw can then be manually disassembled by the worker.

[0029] By setting up a transport mechanism 3 and a detector 507, the vertical orientation of the steering gear screw under test is checked. In existing steering gear screw internal spline testing equipment, when testing the internal spline, if the steering gear screw is not in a vertical orientation, the external spline 518 and the internal spline are difficult to align, leading to frictional damage. Therefore, by setting up a transport mechanism 3 and a detector 507, after limiting the steering gear screw, the detector 507 checks whether the steering gear screw is vertical. Workers can then correct any improperly positioned steering gear screws to avoid the aforementioned situation.

[0030] By setting up the transport mechanism 3, the steering gear screw under test is limited between multiple sets of symmetrically arranged semi-annular contact plates 306, which are set at different heights to control the steering gear screw under test to be in the vertical direction. At the same time, the bottom of the steering gear screw under test is in the limiting groove 308 to reduce the shaking of the steering gear screw under test during installation.

[0031] Testing agency 5 also includes: The first slide groove 501 is formed inside the fixed frame 4; A first sliding plate 503 is slidably connected inside the first slide groove 501. An electric push rod is provided inside the first slide groove 501, and the electric push rod drives the first sliding plate 503 to move inside the first slide groove 501. The second push rod 504 is installed on the first sliding plate 503 and is configured as an electric push rod. The connecting frame 505 is set on the telescopic end of the second push rod 504 and the central cylinder 508 is installed inside the connecting frame 505. The top of the central cylinder 508 is connected to an external pipe, and the external pipe is connected to an external exhaust fan. The connecting pipe 509 installed below the central cylinder 508 and the cover plate 510 connected to the connecting pipe 509 are composed of a cylinder with openings at the top and bottom and a flared pipe. Both the cylinder and the flared pipe have chambers, and the two chambers are connected. The cylinder is connected to the central cylinder 508 through the connecting pipe 509. A passage 513 is opened inside the cover plate 510; An inclined tube 514 and a protrusion 515 are installed on the outside of the cover plate 510, and the protrusion 515 is made of magnetic material. The motor 511 and the third push rod 512 connected to the output end of the motor 511 are located below the central cylinder 508. The third push rod 512 is an electric push rod. The connecting cylinder 517 is installed on the telescopic end of the third push rod 512; A branch pipe 516 is installed outside the connecting pipe 509. The branch pipe 516 is a spiral flexible hose. The branch pipe 516 is connected to the connecting cylinder 517. The connecting cylinder 517 is connected to the connecting pipe 509 through the branch pipe 516. An external spline 518 is provided inside the connecting cylinder 517 and a through groove is provided inside the external spline 518. An outer ring 519 is fitted around the outer spline 518. The outer ring 519 is a soft brush ring. The outer ring 519 is connected to the connecting cylinder 517 via a telescopic rod at the top of the outer ring 519. Two magnetic blocks are provided at both ends of the outer ring 519 and at a position diagonally below the protrusion 515. The magnetic blocks and the protrusion 515 are magnetically repelled. Both the telescopic rod and the outer ring 519 are detachable. The fourth push rod 520 is installed inside the connecting cylinder 517 and the central tube 521 is connected to the telescopic end of the fourth push rod 520. The fourth push rod 520 is set as an electric push rod. The probe 522 is installed below the central tube 521, and the probe 522 is connected to an external displacement sensor.

[0032] The process of dust extraction using testing agency 5: When the external exhaust fan is started, the gas enters the cover plate 510 through the channel 513 and the inclined pipe 514, then enters the connecting pipe 509 through the cover plate 510, and finally enters the central cylinder 508 through the connecting pipe 509. At the same time, the external exhaust fan creates negative pressure suction in the connecting cylinder 517 through the branch pipe 516, further promoting the secure placement of the external spline 518 in the connecting cylinder 517.

[0033] The third push rod 512 is activated, which drives the connecting cylinder 517 and the external spline 518 to move downward. The external spline 518 gradually passes through the cylindrical part of the cover plate 510. Under the mutual repulsion of the protrusion 515 and the magnetic block, the outer ring 519 moves up and down on the external spline 518, and the telescopic rod is stretched. The inclined tube 514 and the channel 513 outside the external spline 518 perform impurity suction work on the external spline 518.

[0034] As the outer spline 518 moves away from the protrusion 515, the telescopic rod gradually drives the outer ring 519 back to its original position.

[0035] The process of using testing agency 5 to perform internal spline testing: The electric push rod 304 in the first slide groove 501 is activated, and the first push rod 304 drives the first sliding plate 503 and the connecting bracket 505 to move in the direction of the steering screw to be tested. The outer spline 518 gradually moves to the top of the inner spline. The third push rod 512 is activated to different strokes. The third push rod 512 drives the outer spline 518 to gradually move down into the inner spline and stops at multiple positions before entering the inner spline. The worker observes whether the outer spline 518 can smoothly enter the inner spline. If the size difference is too large, the third push rod 512 is adjusted to the initial stroke to avoid excessive friction damage between the two.

[0036] If the external spline 518 can smoothly enter the internal spline, adjust the stroke of the third push rod 512. The third push rod 512 drives the connecting cylinder 517 and the external spline 518 to move upward, moving the external spline 518 away from the internal spline. Then, activate the fourth push rod 520. The fourth push rod 520 drives the center tube 521 and the probe 522 to move downward. Adjust the stroke of the second push rod 504, the electric push rod in the first slide groove 501, and the motor 511 to adjust the contact between the probe 522 and the internal spline, thereby performing contact detection on the internal spline.

[0037] By setting up the detection mechanism 5, dust is sucked from the outer spline 518 using a suction method to prevent excessive impurities on the outer spline 518 from entering the inner spline, which could cause friction on the inner spline or make it difficult for the outer spline 518 to enter the inner spline. At the same time, negative pressure suction promotes the outer spline 518 to be firmly placed in the connecting cylinder 517.

[0038] By setting up the detection mechanism 5, the system first checks whether the external spline 518 can enter the internal spline. Before mating, the external spline 518 is adjusted to stop at several different heights, and workers observe whether the external spline 518 can smoothly enter the internal spline. If the size difference is too large, the third push rod 512 is adjusted to the initial stroke to avoid excessive friction damage between the two. Then, the probe 522 is used to perform internal contact detection on the internal spline to ensure that the internal parameters of the internal spline cannot be determined by the mating detection of the external spline 518 alone.

[0039] Working principle: Before using the equipment, start the first push rod 304. The first push rod 304 drives the second sliding frame 303 to move away from the first sliding frame 302. Then, the worker manually places the cleaned steering gear screw to be tested into the limiting groove 308 of the base plate 307, with the end of the steering gear screw to be tested with the internal spline facing upward.

[0040] Then, the stroke of the first push rod 304 is adjusted, and the first push rod 304 drives the second sliding frame 303 to move closer to the first sliding frame 302. Multiple sets of contact plates 306 on both sides contact and clamp the steering gear screw under test, and perform clamping and limiting work on the steering gear screw under test at different heights.

[0041] After the limit operation is completed, cylinder 301 is activated. Cylinder 301 drives the first sliding frame 302, the first push rod 304 and the second sliding frame 303 to move downwards towards detector 507, thereby driving the steering gear screw under test to move downwards towards detector 507. Detector 507 then detects whether the steering gear screw under test is in the vertical direction.

[0042] As the steering gear screw under test moves to below the detector 507, the detector 507 checks whether the steering gear screw under test is in the vertical direction. If the steering gear screw under test is in the vertical direction, the detection mechanism 5 is adjusted to perform the detection work on the internal spline of the steering gear screw.

[0043] After the test is passed, cylinder 301 is started, which drives the first sliding frame 302, the first push rod 304, the second sliding frame 303, and the steering screw under test to move towards the test point of the internal spline.

[0044] When the external exhaust fan is started, the gas enters the cover plate 510 through the channel 513 and the inclined pipe 514, then enters the connecting pipe 509 through the cover plate 510, and finally enters the central cylinder 508 through the connecting pipe 509. At the same time, the external exhaust fan creates negative pressure suction in the connecting cylinder 517 through the branch pipe 516, further promoting the secure placement of the external spline 518 in the connecting cylinder 517.

[0045] The third push rod 512 is activated, which drives the connecting cylinder 517 and the external spline 518 to move downward. The external spline 518 gradually passes through the cylindrical part of the cover plate 510. Under the mutual repulsion of the protrusion 515 and the magnetic block, the outer ring 519 moves up and down on the external spline 518, and the telescopic rod is stretched. The inclined tube 514 and the channel 513 outside the external spline 518 perform impurity suction work on the external spline 518.

[0046] As the outer spline 518 moves away from the protrusion 515, the telescopic rod gradually drives the outer ring 519 back to its original position.

[0047] The electric push rod 304 in the first slide groove 501 is activated, and the first push rod 304 drives the first sliding plate 503 and the connecting bracket 505 to move in the direction of the steering screw to be tested. The outer spline 518 gradually moves to the top of the inner spline. The third push rod 512 is activated to different strokes. The third push rod 512 drives the outer spline 518 to gradually move down into the inner spline and stops at multiple positions before entering the inner spline. The worker observes whether the outer spline 518 can smoothly enter the inner spline. If the size difference is too large, the third push rod 512 is adjusted to the initial stroke to avoid excessive friction damage between the two.

[0048] If the external spline 518 can smoothly enter the internal spline, adjust the stroke of the third push rod 512. The third push rod 512 drives the connecting cylinder 517 and the external spline 518 to move upward, moving the external spline 518 away from the internal spline. Then, activate the fourth push rod 520. The fourth push rod 520 drives the center tube 521 and the probe 522 to move downward. Adjust the stroke of the second push rod 504, the electric push rod in the first slide groove 501, and the motor 511 to adjust the contact between the probe 522 and the internal spline, thereby performing contact detection on the internal spline.

[0049] If the steering gear screw under test is not in the vertical direction, the worker shall adjust the transport mechanism 3, recalibrate the position of the steering gear screw, and repeat the above actions to perform the test of the internal spline of the steering gear screw.

[0050] After the internal spline test is completed, adjust cylinder 301. Cylinder 301 drives the first sliding frame 302, the second sliding frame 303, and the tested steering gear screw back to their initial positions. Start the first push rod 304. The first push rod 304 drives the second sliding frame 303 away from the first sliding frame 302. The tested steering gear screw can then be manually disassembled by the worker.

[0051] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A steering gear screw detection inner spline detection apparatus comprising a machine body (1), characterized in that, Also includes: The slide rail (2) and the mounting bracket (4) are located on the upper part of the body (1); A transport mechanism (3) is slidably connected inside the slide rail (2). The transport mechanism (3) includes a first sliding frame (302) and a second sliding frame (303) slidably connected inside the slide rail (2) and a cylinder (301) installed inside the slide rail (2). The telescopic end of the cylinder (301) is connected to the first sliding frame (302). The detection mechanism (5) is slidably connected inside the fixed frame (4). The detection mechanism (5) includes a second slide groove (502) opened inside the fixed frame (4), a second slide plate (506) slidably connected inside the second slide groove (502), and a detector (507) connected to the second slide plate (506). The cylinder (301) is used to drive the first slide frame (302) and the second slide frame (303) to move below the detector (507).

2. The internal spline testing device for steering gear screw testing according to claim 1, characterized in that: The transportation agency (3) also includes: A first push rod (304) is installed outside the first sliding frame (302), and the telescopic end of the first push rod (304) is connected to the second sliding frame (303); The base plate (307) is located outside the first sliding frame (302), and the limiting groove (308) is opened inside the base plate (307).

3. The internal spline testing device for steering gear screw testing according to claim 2, characterized in that: The transportation agency (3) also includes: Adjusting rod (305) is provided inside the first sliding frame (302) and the second sliding frame (303); Contact plate (306) installed outside the adjusting rod (305).

4. The internal spline testing device for steering gear screw testing according to claim 1, characterized in that: The testing organization (5) also includes: The first groove (501) is opened inside the fixed frame (4); The first sliding plate (503) is slidably connected inside the first sliding groove (501).

5. The internal spline testing device for steering gear screw testing according to claim 4, characterized in that: The testing organization (5) also includes: The second push rod (504) is installed on the first sliding plate (503); The connecting frame (505) is provided on the telescopic end of the second push rod (504), and the central cylinder (508) is installed inside the connecting frame (505).

6. The internal spline testing device for steering gear screw testing according to claim 5, characterized in that: The testing organization (5) also includes: A connecting pipe (509) installed below the central cylinder (508) and a cover plate (510) connected to the connecting pipe (509); A passage (513) is opened inside the cover plate (510). An inclined tube (514) and a protrusion (515) are installed on the outside of the cover plate (510).

7. The internal spline testing device for steering gear screw testing according to claim 6, characterized in that: The testing organization (5) also includes: The motor (511) and the third push rod (512) connected to the output end of the motor (511) are located below the central cylinder (508). The connecting tube (517) is installed on the telescopic end of the third push rod (512).

8. The internal spline testing device for steering gear screw testing according to claim 7, characterized in that: The testing organization (5) also includes: A branch pipe (516) installed outside the connecting pipe (509) is connected to the connecting cylinder (517); An external spline (518) located inside the connecting cylinder (517) and a through groove located inside the external spline (518); An outer ring (519) fitted outside the outer spline (518).

9. The internal spline testing device for steering gear screw testing according to claim 8, characterized in that: The testing organization (5) also includes: The fourth push rod (520) installed inside the connecting tube (517) and the central tube (521) connected to the telescopic end of the fourth push rod (520); The probe (522) is installed below the central tube (521).

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