Rack and pinion steering gear stroke and overall length detection tool and detection method

Abstract

The application discloses a rack and pinion type steering machine stroke and total length detection tool and detection method, which comprises a rack, a controller, a pressing assembly, a bracket and two groups of clamping and measuring assemblies symmetrically arranged on the two sides of the bracket. Each group of the clamping and measuring assemblies comprises a support frame, a profiling piece and a measuring plate. An operator places a steering machine on the bracket, moves the support frame, and correspondingly arranges the profiling piece and the bracket. The pull rod of the steering machine is placed into the profiling groove, and the pull rod is fixed. A first piston cylinder drives a pressing rod to descend and abut against the peripheral wall of the steering machine, so that the steering machine is fixed. Then, an input drive machine is connected with the input shaft of the steering machine and rotates. The input shaft drives the pull rod to move leftward or rightward, so that the pull rod drives the profiling piece to move along the measuring plate, and the displacement of the pull rod is directly measured, and the theoretical calculation error caused by the gear / rack machining tolerance is avoided.

Description

Technical Field

[0001] This invention relates to the field of steering gear testing technology, specifically to a fixture and method for testing the stroke and total length of a rack and pinion steering gear. Background Technology

[0002] The application of rack and pinion steering gears in the automotive industry is becoming increasingly widespread. The accuracy of the rack's full stroke directly determines the accuracy of the wheel steering angle, which in turn affects the vehicle's handling stability and driving safety. At the same time, the consistency of the overall length of the steering gear is crucial to the vehicle assembly efficiency and customer satisfaction. In the factory quality inspection, rack stroke detection is a mandatory step, requiring that the left and right limit displacements of the rack must be strictly controlled within the design tolerance range. The current detection method has the following significant defects: (1) Stroke detection relies on theoretical calculation: the input shaft is rotated by a servo motor, and then the rack displacement is calculated by multiplying it by the transmission ratio. This method does not take into account the machining tolerances of the gears and racks, resulting in inaccurate detection results; (2) Overall length detection lacks quantitative means: a fixed fixture is used, and the qualification is determined only by whether the ball joints on both sides can be placed into the contour seat (i.e., "placed in place is qualified"). It cannot output digital data, and the wear of the fixture can easily lead to batch quality accidents; (3) Low efficiency of manual operation: the steering gear is heavy, and manual handling is laborious. In addition, the sequential detection process further reduces efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a fixture for detecting the stroke and overall length of a rack and pinion steering gear, comprising:

[0004] The frame is equipped with a first slide rail;

[0005] The controller is mounted on the rack;

[0006] The clamping assembly includes a first piston cylinder and a pressure rod, one end of which is connected to the first piston cylinder and the other end of which is used to abut against the outer peripheral wall of the steering gear. The controller is connected to the first piston cylinder.

[0007] Conveying assembly, including a feed chute and a conveyor belt disposed on the feed chute;

[0008] The positioning assembly includes a positioning plate and a second piston cylinder. The positioning plate is fixed to the side wall of the feed channel plate, and the second piston cylinder is mounted on the frame.

[0009] The bracket has its bottom surface placed on the conveyor belt and its top surface provided with a slot for placing the steering gear; the push rod of the second piston cylinder can abut against the bottom surface of the bracket, so that the bracket is clamped between the push rod and the positioning plate.

[0010] Two sets of clamping and measuring components are symmetrically arranged on both sides of the bracket. Each set of clamping and measuring components includes a support frame, a contouring component, and a measuring plate, wherein:

[0011] One end of the support frame is provided with a first slider that slides in cooperation with the first slide rail, and the measuring plate is installed at the other end of the support frame. The length direction of the first slide rail is perpendicular to the length direction of the bracket.

[0012] The measuring plate surface is provided with a scale and a second slide rail, the length direction of the second slide rail being parallel to the length direction of the bracket;

[0013] The side wall of the contouring component is provided with a second slider that slides in cooperation with the second slide rail, the top surface of the contouring component is provided with a contouring groove for placing the pull rod, and the contouring component is provided with a displacement sensor connected to the controller.

[0014] Optionally, it also includes a proximity switch, which is fixedly mounted on the bottom of the contouring part. The bottom of the contouring groove is provided with a trigger component. One end of the trigger component is movably abutting against the pull rod, and the other end of the trigger component is correspondingly set with the proximity switch. The controller is connected to the proximity switch.

[0015] Optionally, the trigger assembly includes a trigger rod, a first guide post, and a spring. The profiled part has a first through hole through which the trigger rod passes. The first guide post is detachably connected to the profiled part. The spring is located inside the first guide post. One end of the trigger rod movably abuts against the pull rod, and the other end of the trigger rod passes through the first through hole and abuts against the spring. The first guide post has a second through hole through which the detection head of the proximity switch passes. When the pull rod presses against the trigger rod, the other end of the trigger rod is correspondingly positioned with the proximity switch.

[0016] Optionally, the contouring component includes a first contouring block and a second contouring block detachably connected to the first contouring block. The first contouring block is provided with the contouring groove and a first through hole. A second guide post is installed in the second contouring block. The second guide post is provided with a third through hole for the rod body to pass through. The second guide post is provided with a flange detachably connected to the second contouring block.

[0017] Optionally, the bottom surface of the contouring part is provided with a mounting plate. One end of the mounting plate is connected to the contouring part, and the other end of the mounting plate is bent and extended to the bottom of the first guide post. The mounting plate is provided with a fifth through hole for the detection head of the proximity switch to pass through. The first guide post is provided with a cavity for accommodating a spring. One end of the spring is connected to the bottom of the cavity, and the other end of the spring is provided with a connecting block. The trigger rod and the connecting block are movably abutted against each other.

[0018] Optionally, it also includes a rotary pressing cylinder and a start switch connected to the rotary pressing cylinder. The start switch is connected to the controller, and the pressure plate of the rotary pressing cylinder moves against the outer wall of the pull rod.

[0019] Optionally, the bracket includes a first tray and a second tray disposed on the top surface of the first tray. The second tray is provided with the support plate. The bottom surface of the first tray contacts the conveyor belt. The positioning plate includes a first positioning block and a second positioning block perpendicularly connected to the first positioning block. The first positioning block is connected to the side wall of the feed channel plate. The second positioning block is bent toward the direction of the conveyor belt, and the height of the lower surface of the second positioning block from the upper surface of the conveyor belt is greater than the height of the first tray when it is not lifted.

[0020] Optionally, the displacement sensor is a grating ruler, the reading head of which is fixed to the bottom of the contour piece, and the scale of the grating ruler is set along the extension direction of the second slide rail of the measuring plate.

[0021] This invention also discloses a method for detecting the stroke and total length of a rack and pinion steering gear, based on the rack and pinion steering gear stroke and total length detection fixture described above, comprising the following steps:

[0022] (1) Place the rack and pinion steering gear in the slot on the bracket, and the conveyor belt drives the bracket to move to the positioning assembly;

[0023] (2) The push rod of the second piston cylinder extends out to abut against and lift the bottom surface of the bracket, so that the positioning plate presses against the bracket;

[0024] (3) The first piston cylinder drives the pressure rod to descend and abut against the outer peripheral wall of the steering gear;

[0025] (4) Move the support frame to align the contour piece with the ball head of the pull rod, and place the pull rod into the contour groove. The trigger component moves down to trigger the proximity switch.

[0026] (5) After receiving the signal, the controller starts the indicator light. The operator triggers the start switch. The controller responds to the signal from the start switch to control the rotating pressing cylinder to move, so that the pressure plate of the rotating pressing cylinder presses the pull rod.

[0027] (6) Drive the steering gear input shaft, which drives the rack and tie rod to move linearly, and the contour piece moves along the second slide rail of the measuring plate;

[0028] (7) Read the rod stroke by measuring the scale on the measuring plate or displaying the data on the controller screen in real time.

[0029] The beneficial effects of the present invention are: (1) The gear rack steering gear is placed in the slot on the bracket, the conveyor belt drives the bracket to move to the positioning component, the push rod of the second piston cylinder extends to abut against and lift the bottom surface of the bracket, so that the positioning plate presses against the bracket, and then the first piston cylinder drives the pressure rod to descend and abut against the outer peripheral wall of the steering gear; the support frame is moved so that the contour part is set in accordance with the bracket, the tie rod of the steering gear is placed in the contour groove, the tie rod is fixed, and then the input drive is connected to the input shaft of the steering gear and rotated, and the tie rod is driven to move to the left or right through the input shaft, so that the tie rod drives the contour part to move along the measuring plate, the displacement sensor set on the contour part records the displacement data in real time, the controller obtains and displays the single-sided tie rod stroke value in real time, and the total length of the steering gear is calculated by superimposing the strokes of both sides to calculate the total length value (L). 总 =L 左 +L 右 +body reference length), if the left and right strokes and total length are within the tolerance, it is judged as qualified, and the displacement of the pull rod is directly measured to avoid the theoretical calculation error caused by the gear / rack machining tolerance. At the same time, the staff can manually check the reference according to the scale on the measuring plate. (2) When the pull rod is put into the contour groove, the trigger rod moves downward under force. After the proximity switch detects the trigger rod, it sends information to the controller. The controller receives the trigger signal and prepares for the next action. The spring buffer ensures that the trigger rod and the pull rod are in flexible contact to prevent hard collision damage to the parts; the first guide post ensures that the movement trajectory of the trigger rod is accurate and improves the triggering stability of the proximity switch. The trigger rod includes a rod head and a rod body. The rod body passes through the first through hole and abuts against the spring. The diameter of the rod head is greater than the diameter of the first through hole, and the diameter of the rod body is smaller than the diameter of the first through hole. The rod head limit design prevents the trigger rod from leaving the through hole;

[0030] (3) The conveyor belt is driven by the motor to run along the feed plate, and transports the bracket with the steering gear to the positioning component. The push rod of the second piston cylinder lifts the first tray, so that the first tray is clamped between the second positioning block and the push rod of the second piston cylinder, and the bracket is fixed, which facilitates the pressure rod to fix the steering gear and measure the stroke of the steering gear. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the rack and pinion steering gear stroke and total length detection fixture proposed in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the positioning component of the rack and pinion steering gear stroke and total length detection fixture proposed in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the clamping and measuring assembly of the rack and pinion steering gear stroke and total length detection fixture proposed in an embodiment of the present invention;

[0034] Figure 4This is a schematic diagram of the triggering component of the rack and pinion steering gear stroke and total length detection fixture proposed in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the proximity switch for the gear and rack steering gear stroke and total length detection fixture proposed in an embodiment of the present invention.

[0036] The labels in the attached figures are as follows: 1. Frame; 11. First slide rail; 2. Controller; 3. Clamping assembly; 31. First piston cylinder; 32. Pressure rod; 4. Bracket; 41. First tray; 42. Second tray; 43. Support plate; 5. Clamping and measuring assembly; 51. Support frame; 511. First slider; 52. Measuring plate; 521. Second slide rail; 53. Copying component; 531. Copying groove; 532. First copying block; 533. Second copying block; 534. Second slider; 54. Mounting plate; 55. Screw; 56. Proximity switch 57. Trigger assembly; 571. Trigger rod; 571a. Rod head; 571b. Rod body; 572. First guide post; 572a. Second through hole; 573. Spring; 574. Connecting block; 575. Second guide post; 575a. Flange; 6. Rotary pressing cylinder; 61. Pressure plate; 7. Conveying assembly; 71. Material channel plate; 72. Conveyor belt; 8. Positioning assembly; 81. Positioning plate; 811. First positioning block; 812. Second positioning block; 82. Second piston cylinder; 821. Push rod; 9. Steering mechanism; 91. Pull rod. Detailed Implementation

[0037] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 5As shown, this embodiment discloses a rack and pinion steering gear stroke and total length detection fixture, including: a frame 1 with a first slide rail 11; a controller 2 installed on the frame 1; a clamping assembly 3 including a first piston cylinder 31 and a pressure rod 32, one end of the pressure rod 32 being connected to the first piston cylinder 31, and the other end of the pressure rod 32 being used to abut against the outer peripheral wall of the steering gear, the controller 2 being connected to the first piston cylinder 31; a conveying assembly 7 including a feed channel plate 71 and a conveyor belt 72 disposed on the feed channel plate 71; a positioning assembly 8 including a positioning plate 81 and a second piston cylinder 82, the positioning plate 81 being fixed to the side wall of the feed channel plate 71, and the second piston cylinder 82 being disposed on the frame 1; a bracket 4, the bottom surface of which is placed on the conveyor belt, and the top surface having a slot for placing the steering gear; wherein, the push rod of the second piston cylinder 82 can abut against the bottom surface of the bracket 4, so that the bracket... The bracket 4 is held between the top rod and the positioning plate 81; two sets of clamping and measuring components 5 are symmetrically arranged on both sides of the bracket 4. Each set of clamping and measuring components includes a support frame 51, a contouring component 53, and a measuring plate 52. The support frame 51 has a first slider 511 at one end that slides in cooperation with the first slide rail 11, and the measuring plate 52 is installed at the other end of the support frame 51. The length direction of the first slide rail 11 is perpendicular to the length direction of the bracket 4. The surface of the measuring plate 52 is provided with a scale and a second slide rail 521. The length direction of the second slide rail 521 is parallel to the length direction of the bracket 4. The side wall of the contouring component 53 is provided with a second slider 534 that slides in cooperation with the second slide rail 521. The top surface of the contouring component 53 is provided with a contouring groove 531 for placing the pull rod. The contouring component 53 is provided with a displacement sensor connected to the controller 2.

[0039] The rack and pinion steering gear is placed in the slot on the bracket 4. The conveyor belt 72 moves the bracket 4 to the positioning assembly. The push rod of the second piston cylinder 82 extends and abuts against and lifts the bottom surface of the bracket 4, causing the positioning plate to press against the bracket 4. The operator places the steering gear on the bracket 4. Then, the first piston cylinder 31 drives the pressure rod 32 to descend and abut against the outer peripheral wall of the steering gear. The support frame 51 is moved so that the contour piece 53 is aligned with the bracket 4. The tie rod 91 of the steering gear is placed into the contour groove 531, and the tie rod 91 is then aligned. The steering gear is fixed in place. The first piston cylinder 31 drives the pressure rod 32 to descend and abut against the outer peripheral wall of the steering gear, thus fixing the steering gear. Then, the input drive motor is connected to the input shaft of the steering gear and rotates. The input shaft drives the tie rod 91 to move left or right, causing the tie rod 91 to move the contour piece 53 along the measuring plate. The displacement sensor on the contour piece 53 records the displacement data in real time. The controller 2 acquires and displays the single-side tie rod stroke value in real time. The total length of the steering gear is calculated by superimposing the strokes of both sides to calculate the total length value (L). 总 =L 左 +L 右+Main body reference length), if the left and right strokes and total length are within tolerance, it is judged as qualified, and the displacement of tie rod 91 is directly measured to avoid theoretical calculation errors caused by gear / rack machining tolerances. At the same time, the staff can manually verify the reference according to the scale on the measuring plate. The main body reference length is the design distance between the center lines of the mounting holes of the two tie rods 91 on the steering gear housing. This value is determined by the structure of the steering gear housing and is unrelated to the movement of the rack. The main body reference length can be calibrated by the tooling structure itself. The calibration steps are as follows: place the standard steering gear (calibrated by a third party) in the slot of bracket 4; drive the rack to the theoretical center position (zero scale position of the input shaft); clamp the ball joints of the left and right tie rods with the contour slot. At this time, the reading of the displacement sensor (grating ruler) returns to zero; the controller 2 records the center distance between the ball joints of the tie rods 91 on both sides, which is the main body reference length. The conveyor belt 72 is driven by the motor to run along the material channel plate 71, which transports the bracket 4 with the steering gear installed to the positioning component. The material channel plate 71 and the conveyor belt 72 can extend to the previous process or the next process.

[0040] In this embodiment, as Figure 2 and 5 As shown, the detection fixture also includes a proximity switch 56, which is fixedly mounted on the bottom of the contouring part 53. A trigger component 57 is provided at the bottom of the contouring groove 531. One end of the trigger component 57 movably abuts against the pull rod 91, and the other end of the trigger component 57 is correspondingly positioned with the proximity switch 56. The controller 2 is connected to the proximity switch 56. The proximity switch automatically detects whether the pull rod is in place, triggering the controller to prepare for subsequent operations, avoiding human error and improving automation and detection reliability.

[0041] In this embodiment, as Figure 4 As shown, the trigger assembly 57 includes a trigger rod 571, a first guide post 572, and a spring 573. The contouring part 53 has a first through hole through which the trigger rod 571 passes. The first guide post 572 is detachably connected to the contouring part 53. The spring 573 is located inside the first guide post 572. One end of the trigger rod 571 is movably abutted against the pull rod 91, and the other end of the trigger rod 571 passes through the first through hole and abuts against the spring 573. The first guide post 572 has a second through hole 572a through which the detection head of the proximity switch 56 passes. When the pull rod 91 presses the trigger rod 571, the other end of the trigger rod 571 is correspondingly positioned with the proximity switch 56. Spring buffer ensures flexible contact between the trigger rod and the pull rod, preventing damage to parts from hard impacts; the trigger rod 571 includes a rod head 571a and a rod body 571b, the rod body 571b passes through the first through hole and abuts against the spring 573, the diameter of the rod head 571a is larger than the diameter of the first through hole, and the diameter of the rod body 571b is smaller than the diameter of the first through hole, the rod head limiting design prevents the trigger rod from disengaging from the through hole.

[0042] In this embodiment, as Figure 4As shown, the contouring component 53 includes a first contouring block 532 and a second contouring block 533 detachably connected to the first contouring block 532. The first contouring block 532 has the contouring groove 531 and a first through hole. A second guide post 575 is installed inside the second contouring block 533. The second guide post 575 has a third through hole for the rod body 571b to pass through. The second guide post 575 has a flange 575a detachably connected to the second contouring block 533. The first guide post and the second guide post can be connected to the second contouring block by screws, and the first contouring block 532 and the second contouring block 533 can be detachably connected by screws. The second contouring block 532 has a groove, and the flange does not protrude from the groove. The split contouring component facilitates disassembly, maintenance, or replacement of worn parts.

[0043] In this embodiment, as Figure 4 and 5 As shown, the bottom surface of the contouring part 53 is provided with a mounting plate 54. One end of the mounting plate 54 is connected to the contouring part 53, and the other end of the mounting plate 54 is bent and extended to the bottom of the first guide post 572. The mounting plate 54 is provided with a fifth through hole for the detection head of the proximity switch 56 to pass through. The first guide post 572 is provided with a cavity for accommodating the spring 573. One end of the spring 573 is connected to the bottom of the cavity, and the other end of the spring 573 is provided with a connecting block 574. The rod body 571b of the trigger rod abuts against the connecting block 574.

[0044] In this embodiment, as Figure 3 As shown, the testing fixture also includes a rotary pressing cylinder 6 and a start switch connected to the rotary pressing cylinder 6. The start switch is connected to the controller 2. The pressure plate 61 of the rotary pressing cylinder 6 moves against the outer wall of the pull rod 91.

[0045] In this embodiment, as Figure 3 As shown, the bracket 4 includes a first tray 41 and a second tray 42 disposed on the top surface of the first tray 41. The second tray 42 is provided with the support plate 43. The bottom surface of the first tray 41 contacts the conveyor belt 72. The positioning plate 81 includes a first positioning block 811 and a second positioning block 812 perpendicularly connected to the first positioning block 811. The first positioning block 811 is connected to the side wall of the feed channel plate 71. The second positioning block 812 is bent towards the conveyor belt 72, and the height of the lower surface of the second positioning block 812 from the upper surface of the conveyor belt 72 is greater than the height of the first tray 41 when it is not lifted. The push rod 821 of the second piston cylinder 82 lifts the first tray 41, so that the first tray 41 is clamped between the second positioning block and the push rod of the second piston cylinder, fixing the bracket, thereby facilitating the pressure rod to fix the steering gear and measuring the stroke of the steering gear.

[0046] In this embodiment, the displacement sensor is a grating ruler, and the reading head of the grating ruler is fixed to the bottom of the contouring component 53. The scale of the grating ruler is set along the extension direction of the second slide rail 521 of the measuring plate 52. When the contouring component moves with the pull rod, the reading head of the grating ruler collects the displacement signal in real time. The controller processes the data every 0.1 seconds, and the display screen updates the stroke value and movement trajectory diagram synchronously. After the detection is completed, a maximum stroke value report is automatically generated.

[0047] This invention also discloses a method for detecting the stroke and total length of a rack and pinion steering gear, based on the rack and pinion steering gear stroke and total length detection fixture described above, comprising the following steps:

[0048] (1) Place the rack and pinion steering gear 9 into the slot on the bracket 4, and the conveyor belt drives the bracket to move to the positioning assembly;

[0049] (2) The push rod 821 of the second piston cylinder 82 extends out to abut against and lift the bottom surface of the bracket 4, so that the positioning plate 81 presses against the bracket 4;

[0050] (3) The first piston cylinder 31 drives the pressure rod 32 to descend and abut against the outer peripheral wall of the steering gear 9;

[0051] (4) Move the support frame 51 to align the contour piece 53 with the ball head of the pull rod 91, and place the pull rod 91 into the contour groove 531. The trigger component 57 moves down to trigger the proximity switch 56.

[0052] (5) After receiving the signal, the controller 2 starts the indicator light. The operator triggers the start switch. The controller 2 responds to the signal of the start switch to control the rotary pressing cylinder 6 to move, so that the pressure plate 61 of the rotary pressing cylinder 6 presses the pull rod 91.

[0053] (6) Drive the steering gear 9 input shaft, which drives the tie rod 91 and the contouring part 53 to move along the second slide rail 521 of the measuring plate 52;

[0054] (7) Read the stroke of the pull rod 91 by measuring the scale on the measuring plate 52 or displaying the data on the controller 2 screen in real time.

[0055] The controller can integrate a data storage module and a display driver module, which can record displacement data in real time through the grating ruler reading head and provide a manual verification benchmark through the scale plate.

[0056] It is understood that the specific embodiments described above are merely for explaining the relevant invention and not for limiting the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. Any equivalent structural transformations made based on the content of this specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of this invention.

Claims

1. A rack and pinion steering machine stroke and total length detection tool, characterized by, The utility model relates to a rack is equipped with first slide rail, controller is installed in the rack, compression assembly includes first piston cylinder and press bar, one end of press bar is connected first piston cylinder, and the other end of press bar is used for abutting against the outer wall of steering machine, and the controller is connected with first piston cylinder, conveying assembly includes material channel board and conveying belt on material channel board, positioning assembly includes positioning plate and second piston cylinder, positioning plate is fixed on the side wall of material channel board, and second piston cylinder is arranged on the rack, bracket bottom surface is placed on the conveying belt, and the top surface is equipped with the clamping groove for placing steering machine, wherein the top rod of second piston cylinder can abut against the bottom surface of bracket, and the bracket is clamped between the top rod and positioning plate, two groups of clamping measurement assembly are symmetrically arranged on both sides of bracket, and each group of clamping measurement assembly includes support frame, profiling and measurement plate, wherein the one end of support frame is equipped with the first sliding block of sliding cooperation with first slide rail, and the other end of support frame is installed with measurement plate, and the length direction of first slide rail is perpendicular to the length direction of bracket, the surface of measurement plate is equipped with scale and second slide rail, and the length direction of second slide rail is parallel to the length direction of bracket, the side wall of profiling is equipped with the second sliding block of sliding cooperation with second slide rail, the top surface of profiling is equipped with the profiling groove for placing pull rod, and profiling is equipped with displacement sensor connected with controller, still include rotary down pressure cylinder and starting switch connected with rotary down pressure cylinder, starting switch is connected with controller, and the pressure plate of rotary down pressure cylinder abuts against the outer wall of pull rod, still include a rack and pinion type steering machine stroke and total length detection method, including the following steps: (1) the rack and pinion steering machine is placed in the clamping groove on the bracket, and the conveying belt drives the bracket to move to the positioning assembly, (2) the top rod of second piston cylinder extends and abuts against and lifts the bottom surface of bracket, so that the positioning plate presses the bracket, (3) first piston cylinder drives press bar to descend and abut against the outer wall of steering machine, (4) move support frame to make profiling align the ball head of pull rod, and place pull rod into profiling groove, and trigger assembly moves down and triggers proximity switch, (5) controller starts indicator light after receiving signal, and operator triggers starting switch, and controller responds to the signal of starting switch and controls the action of rotary down pressure cylinder, so that the pressure plate of rotary down pressure cylinder compresses pull rod, (6) drive steering machine input shaft, drive rack and pull rod linear motion, and profiling moves along the second slide rail of measurement plate, (7) the data of pull rod stroke is read in real time through the scale of measurement plate or the display screen of controller. The proximity switch is fixedly arranged at the bottom of profiling, the bottom of profiling groove is equipped with trigger assembly, one end of trigger assembly abuts against pull rod, the other end of trigger assembly is correspondingly arranged with proximity switch, and the controller is connected with proximity switch. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The rack and pinion steering stroke and overall length inspection tool of claim 1, wherein, ​ 3. The rack and pinion steering stroke and overall length inspection tool of claim 2, wherein, The trigger assembly comprises a trigger rod, a first guide column and a spring, the profiling piece is provided with a first through hole for the trigger rod to pass through, the first guide column is detachably connected with the profiling piece, the spring is arranged inside the first guide column, one end of the trigger rod is in movable abutment with the pull rod, the other end of the trigger rod passes through the first through hole and is in abutment with the spring, the first guide column is provided with a second through hole for the detection head of the proximity switch to pass through, and the other end of the trigger rod is correspondingly arranged with the proximity switch when the pull rod is pressed against the trigger rod.

4. The rack and pinion steering stroke and overall length inspection tooling of claim 3, wherein, The profiling piece comprises a first profiling block and a second profiling block which is detachably connected with the first profiling block, the first profiling block is provided with the profiling groove and the first through hole, the second profiling block is provided with a second guide column, the second guide column is provided with a third through hole for the rod body to pass through, and the second guide column is provided with a flange which is detachably connected with the second profiling block.

5. The rack and pinion steering stroke and overall length inspection tool of claim 3, wherein, The bottom surface of the profiling piece is provided with a mounting plate, one end of the mounting plate is connected with the profiling piece, the other end of the mounting plate is bent and extended below the first guide column, the mounting plate is provided with a fifth through hole for the detection head of the proximity switch to pass through, the first guide column is provided with a cavity for accommodating the spring, one end of the spring is connected with the bottom of the cavity, the other end of the spring is provided with a connecting block, and the trigger rod is in movable abutment with the connecting block.

6. The rack and pinion steering travel and overall length inspection tool of claim 1, wherein, The bracket comprises a first tray and a second tray arranged on the top surface of the first tray, the second tray is provided with a support plate, and the bottom surface of the first tray is in contact with the conveying belt.

7. The rack and pinion steering travel and overall length inspection tool of claim 1, wherein, The displacement sensor is a grating ruler, the reading head of the grating ruler is fixed to the bottom of the profiling piece, and the scale of the grating ruler is arranged along the extension direction of the second sliding rail of the measuring plate.

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