A method for press-fitting a steering gear shock-absorbing sleeve using an anti-error press-fit device

Abstract

The present invention relates to a method for press-fitting a steering gear shock-absorbing sleeve by using an anti-error press-fitting device, and belongs to the technical field of press-fitting of steering gear housings. The method comprises the following steps: firstly, clamping a workpiece on the anti-error press-fitting device, and then inserting the shock-absorbing sleeve on the anti-error press-fitting device, controlling the anti-error press-fitting device to perform a first press-fitting operation on the shock-absorbing sleeve, and after the anti-error press-fitting device has installed a positioning pad, performing a second press-fitting operation, thereby completing the entire press-fitting operation of the shock-absorbing sleeve, and the press-fitting device can complete the synchronous press-fitting of all the shock-absorbing sleeves at one time, and can perform anti-error detection to effectively avoid the problem of wrong installation of the shock-absorbing sleeve, thereby improving the efficiency of the press-fitting operation of the shock-absorbing sleeve.

Description

Technical Field

[0001] The invention relates to a method for press-fitting a steering gear shock-absorbing sleeve by using an anti-error press-fit device, belonging to the technical field of press-fitting of steering gear housings. Background Art

[0002] The rack and pinion steering gear is widely used in various types of passenger cars. It is mainly composed of gears, racks, aluminum alloy shells and steering rods. The steering gear is installed on the frame under the chassis of the vehicle. According to the load difference of each type of vehicle, the rack and pinion steering gear and the vehicle frame are installed in soft and hard connections. The mounting holes of the aluminum alloy shell of the steering gear are pressed with shock-absorbing sleeves for soft connection, and the mounting holes of the aluminum alloy shell are not pressed with shock-absorbing sleeves for hard connection. The aluminum alloy shell of the steering gear with soft connection generally has 2 to 4 mounting holes. The shock-absorbing sleeves pressed into the mounting holes of the steering gear shell of some models are not exactly the same.

[0003] At present, when the shock-absorbing sleeve is pressed on the steering gear housing with four mounting holes, the commonly used methods are manual pressing and one-by-one pressing using the existing pressing device. There are problems with manual pressing and pressing using the pressing device:

[0004] 1. Manual pressing is to use the strength of human fingers to press the upper part of the shock-absorbing sleeve into the installation hole one by one. Since the outer circle of the upper and lower ends of the shock-absorbing sleeve is provided with flanges (curling), it is difficult for manual hand force to smoothly turn the flange of the lower part of the shock-absorbing sleeve out of the installation hole. Manual pressing is difficult and labor-intensive.

[0005] 2. The existing press-fitting device is a single press rod. When in use, the steering gear is manually straightened so that the four mounting holes correspond to the press rods one by one, and then the upper part of the shock-absorbing sleeve is pressed into the mounting hole by the downward pressure of the press rod. Since flanges (curling edges, flanges) are provided on the outer circles of the upper and lower ends of the shock-absorbing sleeve, although the pressure of the press rod can smoothly turn the flange of the lower part of the shock-absorbing sleeve out (expose) and press out of the mounting hole, the flange of the upper part of the shock-absorbing sleeve will also enter into the mounting hole under the action of pressure, resulting in the problem that the shock-absorbing sleeve cannot be pressed into place. It is also necessary to manually turn over the steering gear housing and then slightly re-press the bottom of the shock-absorbing sleeve so that the flange of the upper part of the shock-absorbing sleeve is turned out (exposed) of the mounting hole. The process of manually turning over the steering gear for re-pressing is not only time-consuming and labor-intensive, and the operation is cumbersome, but also directly affects the efficiency of the press-fitting work.

[0006] On the other hand, since there is a difference in the inner diameters of two of the four shock-absorbing sleeves (the difference is small), during the press-fitting operation of the shock-absorbing sleeves using a press-fitting device, individual differences among the workers can easily lead to the large-diameter shock-absorbing sleeve being incorrectly pressed into the mounting hole of the small-diameter shock-absorbing sleeve. When the shock-absorbing sleeve is incorrectly installed, the product will directly become unqualified and require rework, which will have a certain impact on the product's yield rate. Summary of the invention

[0007] The purpose of the present invention is to provide a method for pressing a steering gear shock absorber sleeve using an anti-error pressing device, which can complete the synchronous pressing of all shock absorber sleeves at one time and can perform error-proof detection to effectively avoid the wrong installation of the shock absorber sleeves, thereby improving the efficiency of the shock absorber sleeve pressing operation.

[0008] The technical solution of the present invention is as follows:

[0009] A method for press-fitting a steering gear shock-absorbing sleeve using an error-proof press-fitting device, characterized in that it comprises the following steps:

[0010] 1) The staff first clamps the steering gear housing to be installed with the shock-absorbing sleeve on the anti-mistake press-fit device;

[0011] 2) After the steering gear housing is clamped in place, the staff will place the four shock-absorbing sleeves to be pressed on top of the corresponding mounting holes of the anti-error pressing device; after the four shock-absorbing sleeves are placed, the anti-error pressing device is controlled to press the four shock-absorbing sleeves along the mounting holes of the steering gear housing into the mounting holes for preliminary pressing;

[0012] 3) During the initial press-fitting process of the shock-absorbing sleeve, the error-proof press-fitting device simultaneously performs error-proof detection on the shock-absorbing sleeve on the second mounting column to detect whether the shock-absorbing sleeve is installed incorrectly; once the shock-absorbing sleeve is installed incorrectly, the press-fitting work is immediately interrupted and the correct shock-absorbing sleeve is manually replaced. If the shock-absorbing sleeve is not installed incorrectly, the press-fitting work is continued;

[0013] 4) After the initial press-fitting of the shock-absorbing sleeves is completed, the flanges (flanges) at the bottom of each shock-absorbing sleeve are located outside the mounting hole, a certain gap is left between the upper surface of the flanges at the bottom of the shock-absorbing sleeves and the bottom end surface of the mounting hole, and the flanges at the top of each shock-absorbing sleeve are located in the mounting hole; and the anti-mistake top column is located in the through hole of the shock-absorbing sleeve; the press-fitting column of the anti-mistake press-fitting device is controlled to reset, thereby completing the initial press-fitting operation of the shock-absorbing sleeve;

[0014] 5) Push the limit mechanisms on the left and right sides to move them toward each other, so that the limit fork moves to the bottom of the support block, thereby forming an axial support for the support block to prevent it from moving axially downward in subsequent work;

[0015] 6) Install positioning pads at the lower end of each press-fitting column, start the anti-error press-fitting device again, and move the front and rear press-fitting columns of the anti-error press-fitting device downward at the same time to perform the second press-fitting operation;

[0016] 7) During the second press-fitting operation, the anti-error press-fitting device uses the front and rear press-fitting columns to press down the steering gear housing through the positioning pads, and the steering gear housing is pressed downward; at the same time, the shock-absorbing sleeve is driven downward;

[0017] 8) When the steering gear housing is pressed downward, the anti-error top column is located in the through hole of the shock-absorbing sleeve; the shock-absorbing sleeve moves downward with the steering gear housing for a certain distance, that is, after the bottom of the shock-absorbing sleeve is completely in contact with the anti-error top column, the shock-absorbing sleeve stops moving downward, and as the steering gear housing continues to move downward, relative sliding is formed between the two, that is, the steering gear housing moves downward and the shock-absorbing sleeve moves upward;

[0018] 9) During the relative sliding between the steering gear housing and the shock-absorbing sleeve, the outer circumference of the anti-misalignment top column cooperates with the circumferential inner wall of the mounting hole to form a clamping support for the circumference of the shock-absorbing sleeve, so that it cannot deform radially, thereby preventing the axial compression caused by the axial resistance during the relative sliding process, and ensuring the smooth relative sliding of the shock-absorbing sleeve;

[0019] 10) As the press-fitting column continues to move downward, the flange at the lower end of the shock-absorbing sleeve is tightly fitted with the lower end surface of the mounting hole, and the press-fitting operation of the shock-absorbing sleeve is completed. At this time, the flange at the upper end of the shock-absorbing sleeve is located outside the upper port of the mounting hole and is tightly fitted with the upper end surface of the mounting hole. The press-fitting column is reset, and the next shock-absorbing sleeve press-fitting operation cycle can be carried out.

[0020] 2. The error-proofing detection process described in step 3) is:

[0021] When the press-fitting column contacts the shock-absorbing sleeve, the through hole of the shock-absorbing sleeve does not cooperate with the pin shaft of the press-fitting column for insertion, causing the pin shaft to move upward, and the pin shaft drives the sliding rod to move upward synchronously and contact the pressure sensor. The pressure sensor receives a signal, which indicates that the shock-absorbing sleeve is installed correctly. On the contrary, if the pin shaft of the press-fitting column is located in the through hole of the shock-absorbing sleeve, the sliding rod of the pin shaft does not contact the pressure sensor, and the pressure sensor does not receive a signal, it indicates that the shock-absorbing sleeve is installed incorrectly, thereby performing error-proofing detection.

[0022] The beneficial effects of the present invention compared with the prior art are:

[0023] In the method of press-fitting the steering gear shock-absorbing sleeve using the anti-error press-fitting device, the outer circumference of the anti-error top column cooperates with the circumferential inner wall of the mounting hole to form a clamping support for the circumference of the shock-absorbing sleeve, so that it cannot be radially deformed, thereby preventing the axial compression formed on it by the axial resistance during the relative sliding process, ensuring the smooth relative sliding of the shock-absorbing sleeve. The device can complete the synchronous press-fitting of all the shock-absorbing sleeves at one time, and can perform anti-error detection to effectively avoid the problem of wrong installation of the shock-absorbing sleeves, thereby improving the efficiency of the shock-absorbing sleeve press-fitting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a device for preventing mis-pressing of a shock-absorbing sleeve of a rack and pinion steering gear;

[0025] Figure 2 It is a front view structural schematic diagram of the present invention;

[0026] Figure 3for Figure 1 The enlarged structural diagram at A in the middle;

[0027] Figure 4 for Figure 2 The enlarged structural diagram at B in the middle;

[0028] Figure 5 for Figure 2 The enlarged structural diagram at C in the middle;

[0029] Figure 6 It is a schematic cross-sectional structure diagram of the positioning pad in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the top support block in the present invention;

[0031] Figure 8 It is a partial structural schematic diagram of the assembly column in the present invention;

[0032] Fig. 9 It is a front view structural schematic diagram of the shock-absorbing sleeve installed in the mounting hole in the present invention.

[0033] In the figure: 1. bottom plate; 2. assembly column; 3. reset spring; 4. top support block; 5. anti-mistake top column; 6. limit rod; 7. assembly hole; 8. limit slot; 9. socket; 10. limit boss; 11. assembly vertical plate; 12. connecting piece; 13. limit fork; 14. frame; 15. lifting cylinder; 16. slider; 17. pressure plate; 18. front pressure column; 19. positioning pad; 20. cylindrical magnet; 21. pressure sensor; 22. slide bar; 23. buffer spring; 24. pin; 25. workpiece; 26. shock-absorbing sleeve; 27. rear pressure column; 28. upper assembly slot; 29. ​​lower assembly slot; 30. connecting hole; 31. guide rod; 32. flange; 33. limit shoulder; 34. slide slot. DETAILED DESCRIPTION

[0034] As attached Figure 1-9 Shown

[0035] The method for press-fitting a steering gear shock-absorbing sleeve by using an anti-error press-fitting device comprises: firstly, clamping a workpiece 25 (steering gear housing) on ​​which the shock-absorbing sleeve is to be installed on the anti-error press-fitting device; the anti-error press-fitting device comprises a base plate 1, a first mounting column, a second mounting column, a third mounting column, a fourth mounting column, a left limiting mechanism, a right limiting mechanism, a left press-fitting mechanism and a right press-fitting mechanism; the first mounting column and the second mounting column are fixedly installed in a staggered manner on the left end of the upper surface of the base plate 1; the third mounting column and the fourth mounting column are symmetrically fixedly installed on the right end of the upper surface of the base plate 1; the first mounting column, the second mounting column, the third mounting column and the fourth mounting column respectively correspond to four mounting holes on the workpiece 25.

[0036] The first mounting column, the second mounting column, the third mounting column and the fourth mounting column of the press-fitting device have the same structure, respectively include an assembly column 2, a reset spring 3, a support block 4 and an anti-mistake support column 5. The bottom of the assembly column 2 is fixedly mounted on the base plate 1 through a flange. An assembly hole 7 is axially provided at the top center of the assembly column 2. A plug hole 9 is radially penetrated on the circumference of the assembly column 2. The plug hole 9 is connected with the assembly hole 7. A limiting boss 10 is provided on the inner wall of the port of the assembly hole 7. A support block 4 is movably installed in the assembly hole 7 below the limiting boss 10 through the reset spring 3. The support block 4 is in the shape of a variable diameter cylinder. A limiting shoulder 33 is provided on the outer circle of the support block 4. The limiting shoulder 33 is matched and contacted with the limiting boss 10 of the assembly hole 7. When working, the limiting boss 10 of the assembly hole 7 limits the limiting shoulder 33 of the support block 4 to prevent the support block 4 from continuing to slide upward excessively inside the assembly hole 7.

[0037] A limiting slot 8 is arranged on the top end face of the assembly column 2, and the cross-section of the limiting slot 8 is semi-circular. The openings of the limiting slot 8 of the first mounting column and the second mounting column are respectively arranged opposite to each other, and the openings of the limiting slots of the third mounting column and the fourth mounting column are respectively arranged opposite to each other. When working, the limiting slot 8 serves to position the mounting hole of the workpiece 25, so that the bottom plane of the mounting hole of the workpiece 25 is clamped in the limiting slots of each mounting column, thereby effectively preventing the workpiece 25 from shifting during the press-fitting process.

[0038] One end of the top of the top support block 4 extends to the outside of the assembly column 2, and an anti-error top column 5 is fixedly installed at the center position of the top of the top support block 4 extending to the outside of the assembly column 2. The anti-error top column 5 is a variable diameter shape, and the thick diameter ends of the anti-error top columns 5 of each installation column have the same diameter and are respectively matched with the inner diameters of each installation hole of the workpiece 25. The thin diameter ends of the anti-error top columns 5 of the first installation column, the second installation column and the third installation column are respectively cylindrical, and the diameters of the anti-error top columns 5 at the thin diameter ends of the first installation column and the third installation column are the same, the anti-error top column 5 at the thin diameter end of the second installation column is smaller than the anti-error top column 5 at the thin diameter end of the first installation column, and the cross-section of the anti-error top column 5 at the thin diameter end of the fourth installation column is waist-round. During operation, the anti-error top columns 5 of each installation column are aligned with the inner diameter of the shock-absorbing sleeve. The through-holes are used for insertion. Since the diameters of the anti-error top columns 5 of the first and third mounting columns are the same, the shock-absorbing sleeves corresponding to the first and third mounting columns do not need to be tested for anti-error. The anti-error top column 5 of the fourth mounting column is waist-shaped, and the shock-absorbing sleeve corresponding to the fourth mounting column does not match the anti-error top column 5 of the first, second and third mounting columns. The shock-absorbing sleeve of the fourth mounting column does not need to be tested for anti-error. Since the anti-error top column 5 at the thin-diameter end of the second mounting column is smaller than the anti-error top column 5 at the thin-diameter end of the first mounting column, the shock-absorbing sleeve 26 corresponding to the first mounting column is easily installed on the anti-error top column 5 at the thin-diameter end of the second mounting column, causing misinstallation. Therefore, it is necessary to perform anti-error detection on the shock-absorbing sleeve 26 of the second mounting column.

[0039] A limiting rod 6 is fixedly installed on the top support block 4 of the fourth installation column. A sliding groove 34 is formed in the assembly column 2 of the fourth installation column corresponding to the limiting rod 6. The sliding groove 34 is in sliding contact connection with the limiting rod 6. During operation, through the cooperation of the sliding groove 34 and the limiting rod 6, the anti-misalignment top column 5 of the fourth installation column is prevented from rotating, thus avoiding the problem that the inner holes of the shock-absorbing sleeves 26 have inconsistent orientations after the anti-misalignment top column 5 of the fourth installation column is installed with the shock-absorbing sleeves.

[0040] A left limiting mechanism is installed on the bottom plate 1 outside the first installation column and the second installation column, and a right limiting mechanism is installed on the bottom plate 1 outside the second installation column and the third installation column. The left limiting mechanism and the right limiting mechanism have the same structure and respectively include an assembly vertical plate 11, a connecting piece 12 and a limiting fork 13. The assembly vertical plate 11 is fixedly installed on the bottom plate 1. The connecting piece 12 is slidably inserted on the assembly vertical plate 11. The connecting piece 12 is in a "U" shape, and limiting forks 13 are respectively fixedly installed at the two ends of the connecting piece 12. The limiting forks 13 are in a "冂" shape. The two limiting forks 13 of the left limiting mechanism are respectively in sliding insertion fit with the jacks 9 of the first installation column and the second installation column, and the two limiting forks 13 of the right limiting mechanism are respectively in sliding insertion fit with the jacks 9 of the second installation column and the third installation column. The limiting fork 13 is in intermittent fit and抵触 connection with the limiting shoulder of the top support block 4. During operation, the jack 9 of the assembly column 2 forms a limit on the limiting fork 13, so that the limiting fork 13 forms a limit on the limiting shoulder of the top support block 4, thereby changing the flexible downward movement of the top support block 4 into a rigid downward movement, which is convenient for the top support block 4 to play a role in supporting the shock-absorbing sleeve during the second press-fitting operation.

[0041] A left press-fitting mechanism is arranged above the first installation column and the second installation column, and a right press-fitting mechanism is arranged above the second installation column and the third installation column. The left press-fitting mechanism and the right press-fitting mechanism have the same structure and respectively include a frame 14, a lifting air cylinder 15, a slider 16, a press-fitting part and a guide rail. The cross-section of the frame 14 is in a "7" shape. The frames 14 of the left press-fitting mechanism and the right press-fitting mechanism are respectively fixedly connected to the bottom plate 1. A lifting air cylinder 15 is fixedly installed at the top of the frame 14. A press-fitting part is fixedly installed at the piston rod end of the lifting air cylinder 15. The press-fitting part includes a bearing plate 17, a front press-fitting column 18, a rear press-fitting column 27, a positioning cushion block 19 and a cylindrical magnet 20. The bearing plate 17 is fixedly connected to the piston rod of the lifting air cylinder 15. Slide rails are symmetrically arranged on the frame 14 on one side of the press-fitting part, and a slider 16 is slidably installed on the slide rails. The slider 16 is fixedly connected to the bearing plate 17 of the press-fitting part.

[0042] A front press-fitting column 18 is fixedly installed at one end of the bearing plate 17, and a rear press-fitting column 27 is fixedly installed at the other end of the bearing plate 17. The front press-fitting column 18 of the left press-fitting mechanism corresponds to the first installation column, the rear press-fitting column 27 of the left press-fitting mechanism corresponds to the second installation column, the front press-fitting column 18 of the right press-fitting mechanism corresponds to the third installation column, and the rear press-fitting column 27 of the right press-fitting mechanism corresponds to the fourth installation column.

[0043] The bottom end surfaces of the front press-fitting column 18 and the rear press-fitting column 27 are respectively and radially evenly provided with circular card holes, and cylindrical magnets 20 are inserted in the circular card holes. The bottom ends of the front press-fitting column 18 and the rear press-fitting column 27 are respectively magnetically adsorbed with positioning pads 19 through the cylindrical magnets 20. The positioning pads 19 are made of metal material, and the positioning pads 19 are in the shape of a variable diameter cylinder. An upper assembly groove 28 is arranged at the center of the top end surface of the positioning pad 19. The upper assembly groove 28 is inserted in cooperation with the bottom plane of the front press-fitting column 18 and the rear press-fitting column 27. The bottom end diameter of the positioning pad 19 is the same as the outer edge diameter of the mounting hole of the workpiece 25. A lower assembly groove 29 is arranged at the center of the bottom end surface of the positioning pad 19. The diameter of the lower assembly groove 29 is larger than the diameter of the flange 32 of the shock-absorbing sleeve, so that the positioning pad 19 does not contact the shock-absorbing sleeve when the workpiece 25 is pressed.

[0044] An intermediate hole is axially arranged at the center of the rear press-fitting column 27 of the left press-fitting mechanism, and an error-proofing detection mechanism is installed in the intermediate hole. The error-proofing detection mechanism includes a pressure sensor 21, a slide rod 22, a buffer spring 23 and a pin 24. The pressure sensor 21 (model M12) is arranged at the top of the intermediate hole of the rear press-fitting column 27 of the left press-fitting mechanism, and the pin 24 is movably inserted at the bottom of the intermediate hole. The bottom end of the pin 24 extends to the outside of the intermediate hole. A connecting hole 30 is radially arranged on the positioning pad 19 between the upper assembly groove 28 and the lower assembly groove 29. The connecting hole 30 is respectively connected with the upper assembly groove 28 and the lower assembly groove 29. One end of the pin 24 passes through the connecting hole 30 of the positioning pad 19 and extends outward, which effectively ensures that when the shock-absorbing sleeve is pressed for the second time, the mechanism continues to perform error-proofing detection on the shock-absorbing sleeve 26.

[0045] A guide rod 31 is installed on the circumference of the pin shaft 24, and a slide groove is set on the circumference of the rear pressure mounting column 27 corresponding to the guide rod 31. The slide groove is slidably connected with the guide rod 31. A slide rod 22 is fixedly installed on the top of the pin shaft 24, and a buffer spring 23 is sleeved on the slide rod 22. One end of the buffer spring 23 is in contact with the inner boss of the middle hole, and the other end of the buffer spring 23 is in contact with the pin shaft 24. The slide rod 22 is intermittently contacted with the pressure sensor 21. The diameter of the pin shaft 24 is smaller than the inner hole diameter of the shock-absorbing sleeve 26 corresponding to the first mounting column, and the diameter of the pin shaft 24 is larger than the inner hole diameter of the shock-absorbing sleeve 26 corresponding to the second mounting column.

[0046] The anti-error pressing device controls the lifting and lowering pneumatic cylinders of the left pressing mechanism and the right pressing mechanism to move synchronously through a program controller (model: Siemens PLCS8-700). The program controller is electrically connected to the pressure sensor. An alarm is externally connected to the program controller, and the program controller is electrically connected to the alarm. When the pressure sensor transmits an error signal to the program controller, the program controller shuts down the pressing device. The program controller also transmits the signal to the alarm, and the alarm sounds an alarm to remind the staff that the shock-absorbing sleeve 26 is incorrectly installed.

[0047] After the workpiece 25 is clamped in place, since an anti-error top column 5 is provided on the top of the support block 4, the thick-diameter end of the anti-error top column 5 is inserted into the four mounting holes of the workpiece 25, and the inner holes on each shock-absorbing sleeve 26 are respectively fitted with the thin-diameter end of the anti-error top column 5 which is shaped like its outer dimensions.

[0048] After the shock-absorbing sleeve 26 and the anti-error top column 5 are assembled, the two lifting pneumatic cylinders 15 of the anti-error press-fitting device are turned on. The two lifting pneumatic cylinders 15 respectively control the piston rod to drive the slider 16 and the press-fitting part to move downward along the guide rail for preliminary press-fitting.

[0049] When the front press-fitting column 18 and the rear press-fitting column 27 of the press-fitting part are in contact with the shock-absorbing sleeve 26 corresponding to the second mounting column, in this process, since the inner hole diameter of the shock-absorbing sleeve 26 corresponding to the first mounting column is 15.2 mm, which is larger than the inner hole diameter of the shock-absorbing sleeve 26 corresponding to the second mounting column, which is 10.2 mm, the through-hole diameter difference of the shock-absorbing sleeve 26 corresponding to the first mounting column and the second mounting column is small, which is difficult to detect manually and is prone to mis-installation. The pin shaft 24 of the anti-mistake detection mechanism is used to perform anti-mistake detection on the shock-absorbing sleeve 26, specifically:

[0050] The diameter of the pin 24 is 12.5 mm. The diameter of the pin 24 is smaller than that of the shock-absorbing sleeve 26 with a through-hole diameter of 15.2 mm. The diameter of the pin 24 is larger than that of the shock-absorbing sleeve 26 with a through-hole diameter of 10.2 mm. When the pin 24 cannot be inserted into the inner hole of the shock-absorbing sleeve 26, the shock-absorbing sleeve 26 resists the pin 24, causing the pin 24 to move upward. When the pin 24 moves upward, it squeezes and deforms the buffer spring 23. The buffer spring 23 stores energy for resetting the pin 24. The pin 24 drives the slide rod 22 to move upward synchronously. After the top end of the slide rod 22 contacts the pressure sensor 21, the pressure sensor 21 receives a pressure signal, indicating that the shock-absorbing sleeve 26 with a through-hole diameter of 10.2 mm is installed correctly.

[0051] On the contrary, the pin shaft 24 is located in the through hole of the shock-absorbing sleeve 26, the top end of the slide rod 22 on the pin shaft 24 does not contact the pressure sensor 21, and the pressure sensor 21 cannot receive the pressure signal, which means that the shock-absorbing sleeve 26 is installed incorrectly. The program controller controls the pressing device to stop and controls the alarm to sound an alarm, thereby performing error-proof detection on the shock-absorbing sleeve 26.

[0052] After the shock-absorbing sleeve 26 corresponding to the second mounting column passes the anti-error detection, it continues to be pressed downward, and the thin-diameter end of the anti-error top column 5 is located in the through hole of the shock-absorbing sleeve. The thin-diameter end of the anti-error top column 5 forms a clamping support for the circumference of the shock-absorbing sleeve, so that it cannot deform radially, thereby preventing the axial compression formed by the axial resistance during relative sliding, thereby ensuring the smooth relative sliding of the shock-absorbing sleeve. Since a reset spring 3 is provided under the top support block 4 and an anti-error top column 5 is installed at the top of the top support block 4, when the shock-absorbing sleeve 26 is pressed downward, it drives the anti-error top column 5 and the top support block 4 to move downward flexibly, thereby effectively preventing the shock-absorbing sleeve 26 from being crushed due to excessive pressure from the installed column.

[0053] After the initial press-fitting of the shock-absorbing sleeves 26 is completed, the flange 32 at the bottom end of each shock-absorbing sleeve 26 is located outside the mounting hole, and a certain gap is left between the upper surface of the flange 32 at the bottom end of the shock-absorbing sleeve 26 and the bottom end surface of the mounting hole, and the flange 32 at the top end of each shock-absorbing sleeve 26 is located inside the mounting hole; the press-fitting column of the device is controlled to reset, thereby completing the initial press-fitting operation of the shock-absorbing sleeve.

[0054] Push the limiting mechanisms on the left and right sides of the press-fitting device to move toward each other, so that the limiting fork 13 moves to the bottom of the support block 4. The limiting fork 13 causes the support block 4 to change from a flexible downward movement to a rigid downward movement. The limiting fork 13 forms a limit on the support block 4, thereby forming an axial support for the shock-absorbing sleeve 26 against the reaction force formed after the support block 4 is compressed, so as to prevent it from axially descending in subsequent work.

[0055] Each positioning pad 19 is respectively adsorbed on the front press-fitting column 18 and the rear press-fitting column 27 by the cylindrical magnet 20. After the positioning pad 19 is installed, the piston rod of the two lifting pneumatic cylinders 15 is controlled to drive the positioning pad 19, the slider 16 and the press-fitting part to move downward along the guide rail again for the second press-fitting operation. At this time, the positioning pad 19 applies downward pressure to the workpiece 25, and the workpiece 25 is pressed downward; at the same time, the shock-absorbing sleeve 26 is driven downward. In the process of the workpiece 25 being pressed downward, the anti-error top column 5 is located in the through hole of the shock-absorbing sleeve 26; the shock-absorbing sleeve 26 moves downward with the workpiece 25 for a certain distance, that is, after the bottom of the shock-absorbing sleeve 26 is completely in contact with the end face of the thick-diameter end of the anti-error top column 5, the shock-absorbing sleeve 26 stops moving downward, and as the workpiece 25 continues to move downward, relative sliding is formed between the two, that is, the workpiece 25 moves downward and the shock-absorbing sleeve 26 moves upward.

[0056] During the relative sliding of the workpiece 25 and the shock-absorbing sleeve 26, the outer circumference of the thin-diameter end of the anti-misalignment top column 5 cooperates with the circumferential inner wall of the mounting hole to form a clamping support for the circumference of the shock-absorbing sleeve 26, so that it cannot deform radially, thereby preventing the axial compression formed by the axial resistance it encounters during the relative sliding process, ensuring the smooth relative sliding of the shock-absorbing sleeve 26. As the press-fitting columns continue to descend, the flange at the lower end of the shock-absorbing sleeve 26 forms a tight fit with the lower end surface of the mounting hole, and the press-fitting operation of the shock-absorbing sleeve 26 is completed. At this time, the flange at the upper end of the shock-absorbing sleeve 26 is located on the outer side of the upper port of the mounting hole and forms a tight fit with the upper end surface of the mounting hole. The press-fitting column is reset, and the next press-fitting operation cycle of the shock-absorbing sleeve 26 can be carried out.

[0057] The method of press-fitting the steering gear shock-absorbing sleeve by using an anti-error press-fitting device forms a clamping support for the shock-absorbing sleeve by cooperating the outer circumference of the anti-error top column with the circumferential inner wall of the mounting hole, so that the shock-absorbing sleeve cannot be radially deformed, thereby preventing the axial compression formed on it by the axial resistance during the relative sliding process, ensuring the smooth relative sliding of the shock-absorbing sleeve. The press-fitting device can complete the synchronous press-fitting of all the shock-absorbing sleeves at one time, and can perform anti-error detection to effectively avoid the problem of wrong installation of the shock-absorbing sleeves, thereby improving the efficiency of the shock-absorbing sleeve press-fitting operation.

Claims

1. An anti-error press-fitting device, characterized in that: The invention comprises a base plate (1), a first mounting column, a second mounting column, a third mounting column, a fourth mounting column, a left limiting mechanism, a right limiting mechanism, a left pressing mechanism and a right pressing mechanism. The first mounting column and the second mounting column are fixedly installed in a staggered manner at the left end of the upper surface of the base plate (1), and the third mounting column and the fourth mounting column are symmetrically fixedly installed at the right end of the upper surface of the base plate (1); the first mounting column, the second mounting column, the third mounting column and the fourth mounting column respectively comprise an assembly column (2), a return spring (3), a top support block (4) and an anti-misalignment top column (5); an assembly hole (7) is axially opened at the center of the top end of the assembly column (2), and a limiting boss (10) is arranged on the inner wall of the end of the assembly hole (7). ), a top support block (4) is movably installed in the assembly hole (7) below the limiting boss (10) through a return spring (3), one end of the top of the top support block (4) extends to the outside of the assembly column (2), and an anti-mistake top column (5) is fixedly installed at the center position of the top of the top support block (4) extending to the outside of the assembly column (2); a left limiting mechanism is installed on the bottom plate (1) outside the first and second mounting columns, and a right limiting mechanism is installed on the bottom plate (1) outside the second and third mounting columns. The left limiting mechanism and the right limiting mechanism respectively include an assembly vertical plate (11), a connecting piece (12) and a limiting fork (13), and the assembly vertical plate (11) is slidably inserted with the connecting piece (12) ), a limit fork (13) is fixedly installed on the end heads of both ends of the connecting member (12), a left pressing mechanism is arranged above the first mounting column and the second mounting column, and a right pressing mechanism is arranged above the second mounting column and the third mounting column, the left pressing mechanism and the right pressing mechanism respectively include a frame (14), a lifting air pressure cylinder (15), a slider (16), a pressing member and a guide rail, a lifting air pressure cylinder (15) is fixedly installed on the top of the frame (14), a pressing member is fixedly installed on the end head of the piston rod of the lifting air pressure cylinder (15), and the pressing member includes a pressure plate (17), a front pressing column (18), a rear pressing column (27), a positioning pad (19) and a cylindrical magnet (20), a bearing The pressure plate (17) is fixedly connected to the piston rod of the lifting air cylinder (15); a front pressure column (18) is fixedly installed on one end of the pressure plate (17); a rear pressure column (27) is fixedly installed on the other end of the pressure plate (17); the front pressure column (18) of the left pressure mechanism is arranged correspondingly to the first mounting column; the rear pressure column (27) of the left pressure mechanism is arranged correspondingly to the second mounting column; the front pressure column (18) of the right pressure mechanism is arranged correspondingly to the third mounting column; the rear pressure column (27) of the right pressure mechanism is arranged correspondingly to the fourth mounting column; the bottom ends of the front pressure column (18) and the rear pressure column (27) are respectively magnetically adsorbed with positioning pads (19) through cylindrical magnets (20).

2. A method for press-fitting a steering gear damping sleeve, using the error-proof press-fitting device according to claim 1, characterized in that: It includes the following steps: 1) The staff first clamps the steering gear housing on which the shock-absorbing sleeve (26) is to be installed on the anti-error press-fit device; 2) After the steering gear housing is clamped in place, the staff will place the four shock-absorbing sleeves (26) to be pressed respectively above the mounting holes corresponding to the error-proofing pressing device; after the four shock-absorbing sleeves (26) are placed, the error-proofing pressing device is controlled to press the four shock-absorbing sleeves (26) along the mounting holes of the steering gear housing into the mounting holes for preliminary pressing; 3) During the initial press-fitting process of the shock-absorbing sleeve (26), the error-proof press-fitting device simultaneously performs error-proof detection on the shock-absorbing sleeve (26) to detect whether the shock-absorbing sleeve (26) is installed incorrectly; once the shock-absorbing sleeve (26) is installed incorrectly, the press-fitting work is immediately interrupted and the correct shock-absorbing sleeve (26) is manually replaced; when the shock-absorbing sleeve (26) is not installed incorrectly, the press-fitting work is continued; 4) After the initial press-fitting of the shock-absorbing sleeve (26) is completed, the flange (32) at the bottom end of each shock-absorbing sleeve (26) is located outside the mounting hole, a certain gap is left between the upper surface of the flange (32) at the bottom end of the shock-absorbing sleeve (26) and the bottom end surface of the mounting hole, the flange (32) at the top end of each shock-absorbing sleeve (26) is located in the mounting hole, and the anti-mistake top column (5) is located in the through hole of the shock-absorbing sleeve (26); the press-fitting column of the anti-mistake press-fitting device is controlled to reset, thereby completing the initial press-fitting operation of the shock-absorbing sleeve (26); 5) pushing the limit mechanisms on the left and right sides to move them toward each other, so that the limit fork (13) moves to the bottom of the support block (4), thereby forming an axial support for the support block (4) to prevent it from moving downward axially in subsequent work; 6) Positioning pads (19) are respectively installed at the lower end of each press-fitting column, and the error-proof press-fitting device is started again, and the front and rear press-fitting columns (27) of the error-proof press-fitting device are simultaneously moved downward to perform a second press-fitting operation; 7) During the second press-fitting operation, the anti-error press-fitting device presses down the steering gear housing through the front and rear press-fitting columns (27) via the positioning pads (19), and the steering gear housing is pressed downward; at the same time, the shock-absorbing sleeve (26) is driven downward; 8) During the downward movement of the steering gear housing under pressure, the anti-error top column (5) is located in the through hole of the shock absorbing sleeve (26); the shock absorbing sleeve (26) moves downward along with the steering gear housing for a certain distance, that is, after the bottom of the shock absorbing sleeve (26) is completely in contact with the anti-error top column (5), the shock absorbing sleeve (26) stops moving downward, and as the steering gear housing continues to move downward, relative sliding is formed between the two, that is, the steering gear housing moves downward and the shock absorbing sleeve (26) moves upward; 9) During the relative sliding of the steering gear housing and the shock absorbing sleeve (26), the outer circumference of the anti-misalignment top column (5) cooperates with the circumferential inner wall of the mounting hole to form a clamping support for the circumference of the shock absorbing sleeve (26) so that it cannot deform radially, thereby preventing the axial compression formed by the axial resistance during the relative sliding process, thereby ensuring the smooth relative sliding of the shock absorbing sleeve (26); 10) As the press-fitting column continues to move downward, the flange (32) at the lower end of the shock-absorbing sleeve (26) is closely fitted with the lower end surface of the mounting hole, and the press-fitting operation of the shock-absorbing sleeve (26) is completed. At this time, the flange (32) at the upper end of the shock-absorbing sleeve (26) is located outside the upper end of the mounting hole and is closely fitted with the upper end surface of the mounting hole. The press-fitting column is reset, and the next press-fitting operation cycle of the shock-absorbing sleeve (26) can be carried out.

3. The method for press-fitting a steering gear damping sleeve according to claim 2, characterized in that: The process of error prevention detection in step 3 is as follows: When the press-fitting column contacts the shock-absorbing sleeve (26), the through hole of the shock-absorbing sleeve (26) does not cooperate with the pin shaft (24) of the press-fitting column for insertion, so that the pin shaft (24) moves upward, and the pin shaft (24) drives the slide bar (22) to move upward synchronously and contact the pressure sensor (21). The pressure sensor (21) receives a signal, indicating that the shock-absorbing sleeve (26) is installed correctly; on the contrary, the pin shaft (24) of the press-fitting column is located in the through hole of the shock-absorbing sleeve (26), the slide bar (22) of the pin shaft (24) does not contact the pressure sensor (21), and the pressure sensor (21) does not receive a signal, indicating that the shock-absorbing sleeve (26) is installed incorrectly, thereby performing error-proofing detection on the shock-absorbing sleeve (26).

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