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CN-122007208-A - Rack alignment detects adjustment device

CN122007208ACN 122007208 ACN122007208 ACN 122007208ACN-122007208-A

Abstract

The invention discloses rack straightening detection and adjustment equipment, relates to the technical field of machining, and aims to solve the problems of rotation safety risk, overcorrection and insufficient bearing capacity of a conveying mechanism in the existing rack straightening process. The equipment comprises a frame, a sectional stepping conveyor, a rotating mechanism, a bending detection mechanism and a straightening device. The segmented stepping conveyor is mounted on the frame and forms a non-interfering working area. The rotating mechanism is symmetrically arranged at two sides of the working area, the plug-in sleeve of the rotating mechanism is connected with the rotating motor through a universal joint, and an elastic pressing sheet is arranged in the rotating mechanism and can drive the workpiece to rotate at different rotating speeds; the bending detection mechanism comprises an eddy current displacement sensor for rapidly screening the jumping amount and a multipoint laser displacement sensor for precisely measuring the profile. And the straightening device performs closed-loop quantitative pressure correction on the workpiece according to the detection data. The invention realizes the high efficiency, high precision and safety of the rack straightening process through the rotation safety design and the dual-mode detection.

Inventors

  • ZHANG LIYU
  • BAI XIANGJUN
  • WU HAORAN

Assignees

  • 太仓久进汽车零部件有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The rack straightening detection and adjustment device is characterized by comprising a rack (3); the segmented stepping conveyor (1) is arranged on the frame (3); The rotary mechanism is arranged at two sides of the working area along the length direction of the frame (3), and comprises a displacement assembly, a rotary motor (32) and a plug sleeve (322), wherein the rotary motor (32) is movably arranged on the frame (3) through the displacement assembly, the plug sleeve (322) is arranged on an output shaft of the rotary motor (32) through a universal joint (321), and an elastic pressing piece (323) for holding a workpiece is arranged in the plug sleeve; the bending detection mechanism is arranged in the working area and is used for detecting bending data of the workpiece in a static state or a rotating state; the straightening device (2) is arranged on the frame (3) and used for correcting the bending position of the workpiece.
  2. 2. The rack straightening detection and adjustment device according to claim 1, characterized in that the segmented stepping conveyor (1) comprises a first conveying mechanism and a second conveying mechanism which are sequentially arranged along a conveying direction, the working area is formed between the first conveying mechanism and the second conveying mechanism, each of the first conveying mechanism and the second conveying mechanism comprises a stepping frame body and a bearing frame body, and the stepping frame bodies are independently driven to realize reciprocating stepping motion.
  3. 3. The rack alignment detection adjustment device according to claim 2, wherein the bending detection mechanism is a multipoint laser displacement sensor (43) disposed below the working area in the width direction of the frame (3).
  4. 4. The rack straightening detection and adjustment device according to claim 3 is characterized in that fixed bearing blocks (31) are arranged on two sides of the working area in the width direction of the frame (3), bearing grooves (311) for bearing workpieces are formed in the tops of the bearing blocks (31), and the device further comprises a lifting mechanism arranged between the bearing blocks (31) and the rotating mechanism.
  5. 5. The rack straightening detection and adjustment device according to claim 4, characterized in that the displacement assembly comprises a sliding rail, a sliding block and an adjusting cylinder (34), the rotating motor (32) is installed on the sliding block, and the adjusting cylinder (34) drives the sliding block to drive the rotating motor (32) to move so that a workpiece can be inserted into or separated from the inserting sleeve (322).
  6. 6. The rack alignment detection adjustment device according to claim 5, wherein the rotation mechanism further comprises a runout detection mechanism, the runout detection mechanism comprises a bracket (35) and an eddy current displacement sensor (36), the bracket (35) is fixed on a sliding block of the displacement assembly, and the eddy current displacement sensor (36) is used for detecting radial runout of the plug sleeve (322) when a workpiece rotates.
  7. 7. A rack alignment detection adjustment device according to claim 6, characterized in that the rotation mechanism is configured to be able to drive the workpiece to rotate in the working area at a first rotational speed or at a second rotational speed higher than the first rotational speed, the resilient tab (323) being configured to hold the workpiece tightly against slipping at the first rotational speed, and to allow the workpiece to slip at the second rotational speed to limit its maximum rotational speed.
  8. 8. The rack straightening detection and adjustment device according to claim 4, wherein the straightening device (2) comprises a straightening driving mechanism (21), a straightening cylinder (22) and a lower pressing head (23), the straightening driving mechanism (21) drives the straightening cylinder (22) to move to the position right above a workpiece bending site along the width direction of the frame (3), and the straightening cylinder (22) drives the lower pressing head (23) to press and straighten a workpiece placed on the pressure-bearing block (31).
  9. 9. The rack alignment detection and adjustment device according to claim 1, characterized in that the elastic pressing piece (323) is arranged in the plug sleeve (322) in an inclined way towards the axis of the plug sleeve, so that the deeper the workpiece insertion depth is, the greater the holding force of the elastic pressing piece (323) on the workpiece is.
  10. 10. A rack alignment detection adjustment device according to claim 1, characterized in that the central height of the rotating motor (32) and its output shaft is set higher than the conveying height of the workpiece on the segmented stepping conveyor (1).

Description

Rack alignment detects adjustment device Technical Field The application relates to the technical field of machining, in particular to rack straightening detection and adjustment equipment. Background In the field of automobile steering system manufacture, racks are used as key transmission components, and the straightness accuracy of the racks directly influences steering performance and safety. In the prior art, when the steering rod rack of the automobile is straightened, a process of combining detection, rotation and local pressure correction is generally adopted. Specifically, an operator usually places the rack on a gauge or a rotating tool, detects radial runout of the rack during rotation through a sensor to judge the bending position and degree, and applies pressure to the bending part to straighten the bending part by means of a hydraulic or pneumatic device. However, the conventional process has a plurality of remarkable defects in practical application, and the processing efficiency and the yield of finished products are limited. First, there is a safety and accuracy risk in the rotation detection process. When the rack itself has a large initial bending, high-speed rotation can generate severe radial runout and swing. This not only results in large signal fluctuations and low signal to noise ratios collected by the sensor, which affects the accuracy of the bending calculation, but also may cause mechanical strokes of the rack to the rotary drive mechanism or the peripheral detection elements due to overrun of the swing amplitude. This risk very easily leads to accurate sensor damage, equipment shut down, causes rack surface to collide with even, introduces secondary damage. Second, there is a risk of overcorrection and reverse buckling during the alignment process. The existing straightening action is dependent on operation experience or simple open-loop control, and the control of the pressing force and the pressure maintaining time lacks of accurate feedback and closed-loop adjustment. In the process of straightening the raised part, excessive pressure application or insufficient material rebound estimation is very easy to cause the rack to generate new plastic deformation, namely over-straightening, in the opposite direction of original bending. The problem often causes the straightening process to fall into the inefficient cycle of forward bending, straightening, reverse bending and re-straightening, and seriously affects the production beat and the consistency of materials. Third, there are rigid load bearing drawbacks to the conveying and positioning system. The traditional rack alignment is usually realized by adopting a rocker type or jacking stepping conveyor. Such mechanism designs focus on intermittent motion accuracy, which often lacks rigidity and compressive strength to support the rail, link, or jack unit. When bearing the centralized strong downward pressure applied by the straightening unit, the whole conveying platform is easy to elastically deform and even permanently damage, and the rack is directly caused to slightly displace or deflect at the moment of straightening. The positioning precision and the final effect of the straightening action are greatly affected, the abrasion of the conveying mechanism is aggravated, the stepping precision is misaligned for a long time, and the equipment maintenance cost is high. Disclosure of Invention In order to solve the problems, the application provides rack straightening detection and adjustment equipment. A rack straightening detection and adjustment device comprises a frame, a segmented stepping conveyor, a rotating mechanism, a bending detection mechanism and a straightening device. The segmented stepping conveyor is arranged on the frame and is used for conveying workpieces and reserving a working area in the middle of the segmented stepping conveyor. The rotary mechanism is arranged on two sides of the working area along the length direction of the frame and comprises a displacement assembly, a rotary motor and a plug sleeve, the rotary motor is movably arranged through the displacement assembly, the plug sleeve is arranged on an output shaft of the rotary motor through a universal joint, and an elastic pressing sheet for tightly holding a workpiece is arranged in the plug sleeve. The bending detection mechanism is arranged in the working area and is used for detecting bending data of the workpiece. The straightening device is arranged on the frame and used for performing pressure correction on the bending part of the workpiece according to the bending data. The rotation mechanism is capable of driving the workpiece to rotate at different rotational speeds, and the elastic press sheet is configured to hold the workpiece tightly at a low speed and to allow slipping at a high speed to limit its maximum rotational speed. Compared with the prior art, through adopting above-mentioned technical scheme, equipment has effectively solved