Tool and method for detecting stroke and total length of gear rack type steering engine

Abstract

The invention discloses a gear rack type steering engine stroke and total length detection tool and method, the gear rack type steering engine stroke and total length detection tool comprises a rack, a controller, a pressing assembly, a bracket and two clamping measurement assemblies, the two clamping measurement assemblies are symmetrically arranged on the two sides of the bracket, each clamping measurement assembly comprises a supporting frame, a profiling part and a measurement plate, an operator places a steering engine on the bracket, the supporting frames are moved, and the clamping measurement assemblies are arranged on the supporting frames. A pull rod of the steering engine is placed in the profiling groove and fixed, a first piston cylinder drives a pressing rod to descend to abut against the peripheral wall of the steering engine, the steering engine is fixed, then an input driver is connected with an input shaft of the steering engine and rotates, and the input shaft drives the pull rod to move leftwards or rightwards. The pull rod drives the profiling piece to move along the measuring plate, the displacement of the pull rod is directly measured, and theoretical calculation errors caused by gear / rack machining tolerance are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steering engine detection, and particularly relates to a rack and pinion type steering engine stroke and total length detection tool and a stroke detection method. BACKGROUND

[0002] The rack and pinion type steering engine is increasingly widely used in the automobile industry, and the rack full stroke precision directly determines the accuracy of the wheel steering angle, and further affects the vehicle control stability and driving safety. Meanwhile, the size consistency of the total length of the steering engine is crucial to the vehicle loading efficiency and customer satisfaction. In the factory inspection, the rack stroke detection is a mandatory link, and the left and right limit displacement of the rack must be strictly controlled within the design tolerance. The current detection method has the following significant defects: (1) the stroke detection relies on theoretical calculation: the rotation angle of the input shaft is driven by a servo motor, and the rack displacement is calculated by multiplying the transmission ratio. This method does not take into account the machining tolerance of the gear and rack, resulting in inaccurate detection results; (2) the total length detection lacks quantitative means: a fixed gauge is used, and the qualitative judgment of whether the two side balls can be put into the profiling seat is made (i.e. "putting into position is qualified"), which cannot output digital data, and the clamp wear can easily cause batch quality accidents; (3) the manual operation is low in efficiency: the steering engine is heavy, and manual handling is laborious, and the separate detection process further reduces the efficiency. SUMMARY

[0003] In view of the above technical problems, the present application provides a rack and pinion type steering engine stroke and total length detection tool, which comprises:

[0004] A rack is provided with a first sliding rail;

[0005] A controller is installed on the rack;

[0006] A pressing assembly comprises a first piston cylinder and a pressing rod, one end of the pressing rod is connected to the first piston cylinder, the other end of the pressing rod is used to abut against the outer peripheral wall of the steering engine, and the controller is connected with the first piston cylinder;

[0007] A conveying assembly comprises a material channel plate and a conveying belt arranged on the material channel plate;

[0008] A positioning assembly comprises a positioning plate and a second piston cylinder, the positioning plate is fixed to the side wall of the material channel plate, and the second piston cylinder is arranged on the rack;

[0009] A bracket is placed on the conveying belt, and a clamping groove for placing the steering engine is arranged on the top surface of the bracket; wherein the top rod of the second piston cylinder can abut against the bottom surface of the bracket, so that the bracket is clamped between the top rod and the positioning plate;

[0010] Two groups of clamping and measuring assemblies are symmetrically arranged on both sides of the bracket, and each group of clamping and measuring assemblies comprises a support frame, a profiling piece and a measuring plate, wherein:

[0011] One end of the support frame is provided with a first sliding block in sliding cooperation with a first sliding rail, and the other end of the support frame is provided with the measuring plate, and a length direction of the first sliding rail is perpendicular to a length direction of the bracket;

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

[0013] The side wall of the profiling part is provided with a second sliding block in sliding cooperation with the second sliding rail, the top surface of the profiling part is provided with a profiling groove for placing the pull rod, and the profiling part is provided with a displacement sensor connected with the controller.

[0014] Optionally, the proximity switch is further arranged on the bottom of the profiling part, the bottom of the profiling groove is provided with a trigger assembly, one end of the trigger assembly is in movable abutment with the pull rod, and the other end of the trigger assembly is arranged in correspondence with the proximity switch, and the controller is connected with the proximity switch.

[0015] Optionally, the trigger assembly comprises a trigger rod, a first guide column and a spring, the profiling part is provided with a first through hole for the trigger rod to pass through, the first guide column is detachably connected with the profiling part, the spring is arranged in the first guide column, one end of the trigger rod is in movable abutment with 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 column is provided with a second through hole for a detection head of the proximity switch to pass through, and the other end of the trigger rod is arranged in correspondence with the proximity switch when the pull rod presses the trigger rod.

[0016] Optionally, the profiling part comprises a first profiling block and a second profiling block 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 detachably connected with the second profiling block.

[0017] Optionally, the bottom surface of the profiling part is provided with a mounting plate, one end of the mounting plate is connected with the profiling part, 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.

[0018] Optionally, the rotating down-pressing air cylinder and a starting switch connected with the rotating down-pressing air cylinder are further arranged, the starting switch is connected with the controller, and a pressing plate of the rotating down-pressing air cylinder is in movable abutment with the outer wall of the pull rod.

[0019] Optionally, 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 the support plate, the bottom surface of the first tray contacts the conveying belt, the positioning plate comprises a first positioning block and a second positioning block connected perpendicularly with the first positioning block, the first positioning block is connected with the sidewall of the channel plate, the second positioning block is bent towards the direction of the conveying belt, and the lower surface of the second positioning block is higher than the height of the upper surface of the conveying belt when the first tray is not jacked up.

[0020] Optionally, 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.

[0021] The application further discloses a rack and pinion steering machine stroke and total length detection method based on the rack and pinion steering machine stroke and total length detection tool.

[0022] (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;

[0023] (2) the top rod of the second piston cylinder extends to abut and jack up the bottom surface of the bracket, so that the positioning plate presses the bracket;

[0024] (3) the first piston cylinder drives the pressing rod to descend and abut the outer peripheral wall of the steering machine;

[0025] (4) the supporting frame is moved to align the profiling piece with the ball head of the pull rod, and the pull rod is arranged in the profiling groove, and the triggering assembly is lowered to trigger the proximity switch;

[0026] (5) after the controller receives the signal, the indicator light is started, the operator triggers the starting switch, and the controller controls the rotary down pressure cylinder to act in response to the signal of the starting switch, so that the pressing plate of the rotary down pressure cylinder presses the pull rod;

[0027] (6) the input shaft of the steering machine is driven to drive the rack and the pull rod to move linearly, and the profiling piece moves along the second sliding rail of the measuring plate;

[0028] (7) the data is read in real time by the measuring plate scale or the display screen of the controller.

[0029] The beneficial effects of the present application are: (1) the rack and pinion steering machine is placed in the clamping groove on the bracket, the conveyor belt drives the bracket to move to the positioning assembly, the top rod of the second piston cylinder extends to abut and lift the bottom surface of the bracket, the positioning plate presses the bracket, then the first piston cylinder drives the pressing rod to descend and abut the peripheral wall of the steering machine; the moving support frame is moved, the profiling part is correspondingly arranged with the bracket, the pull rod of the steering machine is placed in the profiling groove, the pull rod is fixed, then the input drive machine is connected with the input shaft of the steering machine and rotates, the pull rod is driven to move left or right through the input shaft, the profiling part is driven to move along the measuring plate, the displacement sensor arranged on the profiling part records the displacement data in real time, the controller acquires and displays the single-side pull rod stroke value in real time, and the calculation method of the total length of the steering machine is: the total length value (L 总 =L 左 +L 右 + the body reference length) is calculated by adding the two strokes, if the left and right strokes and the total length are within the tolerance, it is judged to be qualified, the pull rod displacement is directly measured, the theoretical calculation error caused by the rack and pinion machining tolerance is avoided, and the staff can manually review the reference according to the scale on the measuring plate. (2) when the pull rod is placed in the profiling groove, the trigger rod is forced to move downward, the proximity switch detects the trigger rod and 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, preventing hard collision damage to the parts; the first guide column ensures the accuracy of the movement track of the trigger rod, improving the trigger stability of the proximity switch. The trigger rod comprises 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 hole diameter of the first through hole, the diameter of the rod body is less than the hole diameter of the first through hole, and the rod head limiting design prevents the trigger rod from disengaging the through hole;

[0030] (3) the conveyor belt is driven by the motor to run along the material channel plate, and the bracket with the steering machine is conveyed to the positioning assembly. The top rod of the second piston cylinder lifts the first tray, the first tray is clamped between the second positioning block and the top rod of the second piston cylinder, the bracket is fixed, and then the pressing rod fixes the steering machine, and the stroke of the steering machine is measured. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure diagram of the rack and pinion steering machine stroke and total length detection tooling for the embodiments of the present application is provided;

[0032] Figure 2 The positioning assembly diagram of the rack and pinion steering machine stroke and total length detection tooling for the embodiments of the present application is provided;

[0033] Figure 3 The clamping and measuring assembly diagram of the rack and pinion steering machine stroke and total length detection tooling for the embodiments of the present application is provided;

[0034] Figure 4The schematic view of the trigger assembly of the rack and pinion steering machine stroke and total length detection tooling proposed in the embodiment of the application;

[0035] Figure 5 The schematic view of the proximity switch of the rack and pinion steering machine stroke and total length detection tooling proposed in the embodiment of the application.

[0036] The marks in each drawing are: 1, rack; 11, first slide rail; 2, controller; 3, pressing assembly; 31, first piston cylinder; 32, pressing rod; 4, bracket; 41, first tray; 42, second tray; 43, support plate; 5, clamping measurement assembly, 51, support frame; 511, first slide block; 52, measurement plate; 521, second slide rail; 53, profiling piece; 531, profiling groove; 532, first profiling block; 533, second profiling block; 534, second slide block; 54, mounting plate; 55, screw; 56, proximity switch; 57, trigger assembly; 571, trigger rod; 571a, rod head; 571b, rod body; 572, first guide column; 572a, second through hole; 573, spring; 574, connecting block; 575, second guide column; 575a, flange; 6, rotary down-pressing air cylinder; 61, pressing plate; 7, conveying assembly; 71, material channel plate; 72, conveying belt; 8, positioning assembly; 81, positioning plate; 811, first positioning block; 812, second positioning block; 82, second piston cylinder; 821, ejector rod; 9, steering machine; 91, pull rod. DETAILED DESCRIPTION

[0037] The application will be further described in detail below in combination with the drawings and embodiments.

[0038] As 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 fixture for detecting the stroke and overall length of a rack and pinion steering gear, characterized in that, include: The frame is equipped with a first slide rail; The controller is mounted on the rack; 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. Conveying assembly, including a feed chute and a conveyor belt disposed on the feed chute; 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. 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. 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: 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. 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; 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.

2. The rack and pinion steering gear stroke and overall length detection fixture according to claim 1, characterized in that, It also includes a proximity switch, which is fixedly installed at 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.

3. The rack and pinion steering gear stroke and overall length detection fixture according to claim 2, characterized in that, The trigger assembly includes a trigger rod, a first guide post, and a spring. The contoured part has a first through hole through which the trigger rod passes. The first guide post is detachably connected to the contoured part. The spring is located inside the first guide post. One end of the trigger rod is movably abutted 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 the trigger rod, the other end of the trigger rod is correspondingly positioned with the proximity switch.

4. The rack and pinion steering gear stroke and overall length detection fixture according to claim 3, characterized in that, 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 inside 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.

5. The rack and pinion steering gear stroke and overall length detection fixture according to claim 3, characterized in that, 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 to accommodate 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 move against each other.

6. The rack and pinion steering gear stroke and overall length detection fixture according to claim 3, characterized in that, 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.

7. The rack and pinion steering gear stroke and overall length detection fixture according to claim 6, characterized in that, 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.

8. The rack and pinion steering gear stroke and overall length detection fixture according to claim 1, characterized in that, 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.

9. 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 in claim 6, characterized in that, Includes the following steps: (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; (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; (3) The first piston cylinder drives the pressure rod to descend and abut against the outer peripheral wall of the steering gear; (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. (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. (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; (7) Read the rod stroke by measuring the scale on the measuring plate or displaying the data on the controller screen in real time.

Images