A positioning mechanism for a lead screw detection

Abstract

A positioning mechanism for screw rod detection, the positioning mechanism comprises a positioning slide rail and two groups of positioning components arranged in opposite directions and sliding on the positioning slide rail; the positioning component comprises a positioning base plate, a positioning seat is assembled on the positioning base plate, a positioning block is assembled on the positioning seat, a positioning groove is arranged on the positioning block, the positioning groove has a horn-shaped positioning surface, and the positioning surface is used for abutting a chamfer at a stepped end surface of a screw rod to realize positioning of the screw rod. Compared with the prior art, the positioning mechanism has the following beneficial technical effects: the design is good in centering, can be applied to positioning of screw rods with different outer diameters, and is high in applicability.

Description

Technical Field

[0001] This utility model belongs to the field of lead screw positioning technology, specifically relating to a positioning mechanism for lead screw detection. Background Technology

[0002] In the testing of automotive seat lead screws, the accuracy and adaptability of the positioning mechanism directly affect the reliability of the test results. Existing lead screw testing equipment typically suffers from the following technical deficiencies in its positioning mechanism:

[0003] 1. Poor centering: Traditional positioning mechanisms often use fixed V-groove or positioning block structures, where the contact between the positioning surface and the lead screw step end face is rigid. When there are manufacturing errors or outer diameter fluctuations in the lead screw, positioning offset is easily generated, causing the detection datum to not coincide with the lead screw axis, thus increasing the detection error of the total runout tolerance.

[0004] 2. Limited adaptability: The adjustment of existing positioning mechanisms relies on manual operation. For example, it is necessary to replace positioning blocks of different specifications or adjust multiple fixing bolts to clamp lead screws of different outer diameters, which seriously restricts the detection efficiency. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0006] A positioning mechanism for lead screw detection includes a positioning slide rail and two sets of opposing positioning components slidably disposed on the positioning slide rail. Each positioning component includes a positioning base plate, a positioning seat mounted on the positioning base plate, a positioning block mounted on the positioning seat, and a positioning groove provided on the positioning block. The positioning groove has a trumpet-shaped positioning surface, which is used to fit against the chamfer at the stepped end face of the lead screw to achieve positioning of the lead screw.

[0007] In a preferred embodiment of a positioning mechanism for lead screw detection, the positioning assembly further includes two lifting blocks symmetrically arranged on both sides of the positioning seat; the positioning seat has inclined contact surfaces A on both sides, and a first guide groove is formed on the contact surfaces A; the lifting blocks have contact surfaces B that conform to the contact surfaces A, and a first guide rail that matches the first guide groove is formed on the contact surfaces B; the positioning base plate has a second guide rail, and the bottom of the lifting blocks has a second guide groove that matches the second guide rail.

[0008] In a preferred embodiment of a positioning mechanism for lead screw detection, the positioning assembly further includes an adjusting rod, which comprises a limiting section in the middle and threaded sections on both sides, with opposite threads on the two threaded sections. One end of the adjusting rod is provided with an adjusting handle. A limiting block is provided on the positioning base plate, and the limiting block has a limiting groove that mates with the limiting section; the lifting block has a threaded groove, and the two threaded sections are respectively screwed into the threaded grooves of two sets of lifting blocks.

[0009] In a preferred embodiment of a positioning mechanism for lead screw detection, the positioning base plate is provided with a guide rod, and the positioning seat is provided with a guide hole that cooperates with the guide rod.

[0010] In a preferred embodiment of a positioning mechanism for lead screw detection, the bottom of the positioning groove is provided with a through hole through the positioning block for the lead screw end to pass through.

[0011] In a preferred embodiment of a positioning mechanism for lead screw detection, a bearing is provided between the positioning block and the positioning seat to allow the positioning block to rotate relative to the positioning seat.

[0012] Compared with the prior art, this application has the following beneficial technical effects: the design has good centering and can be applied to the positioning of lead screws with different outer diameters, and has strong applicability. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the detection device.

[0014] Figure 2 This is a side view of the detection device.

[0015] Figure 3 This is a partial structural diagram of the detection component.

[0016] Figure 4 This is a side view of the detection component.

[0017] Figure 5 This is a 3D view of the drive mechanism.

[0018] Figure 6 This is a partial structural diagram of the positioning mechanism.

[0019] Figure 7 This is a cross-sectional view of the positioning component.

[0020] Figure 8 This is an exploded view of the positioning component.

[0021] The following is an explanation of the reference numerals in the attached figures:

[0022] 100. Positioning mechanism; 110. Positioning slide rail; 120. Positioning base plate; 121. Guide rod; 122. Second guide rail; 123. Limiting block; 124. Limiting groove; 130. Positioning seat; 131. Positioning block; 132. Positioning groove; 133. Positioning surface; 134. Through hole; 135. Contact surface A; 136. First guide groove; 140. Lifting block; 141. Contact surface B; 142. First guide rail; 143. Second guide groove; 144. Threaded groove; 150. Adjusting rod; 151. Limiting section; 152. Threaded section; 153. Adjusting handle;

[0023] 200. Drive mechanism; 210. Feed module; 220. Lifting module; 221. Lifting screw; 222. Lifting handle; 230. Drive module; 231. Drive wheel;

[0024] 300. Detection mechanism; 310. Mounting base plate; 311. Lifting base plate; 312. Guide column; 313. Lifting cylinder; 320. Mounting frame; 330. Detection module; 331. Detection seat; 332. Reset rod; 333. Detection head; 334. Elastic element; 335. Elastic conductive sheet; 336. Detection arm; 337. Through slot. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] In the following embodiments, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this utility model, it should be understood that the terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, and counterclockwise, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] refer to Figures 1 to 8 A detection device for a lead screw for an automotive seat includes a base on which a positioning mechanism 100, a driving mechanism 200, and a detection mechanism 300 are mounted. The positioning mechanism 100 is used to position the lead screw, and the driving mechanism 200 is used to drive the lead screw to rotate.

[0029] refer to Figures 1 to 4The detection mechanism 300 includes a lifting frame, on which a detection component is mounted. Specifically, the lifting frame includes a mounting base 310 and a lifting base 311. The lifting base 311 is fixedly connected to a base via several guide posts 312, and the lifting base 311 is slidably connected to the guide posts 312. A lifting cylinder 313 is provided on the mounting base 310, and the output end of the lifting cylinder 313 is connected to the lifting base 311. The detection component is mounted on the lifting base 311. The detection component includes a mounting frame 320, on which several detection modules 330 are arranged along the axial direction of the lead screw. By forming a comprehensive detection array with multiple detection modules 330 spaced apart along the axial direction of the lead screw, the full runout tolerance detection can be completed in one revolution of the lead screw.

[0030] The detection module 330 includes a detection seat 331, a reset rod 332, an elastic element 334, and an elastic conductive sheet 335. The detection seat 331 has a detection arm 336 with a through groove 337, the inner wall of which is provided with a conductive layer. The reset rod 332 is slidably mounted on the detection seat 331 along the radial direction of the lead screw. The end of the reset rod 332 has a detection head 333 for contacting the outer circumferential surface of the lead screw for detection. The elastic element 334 provides a reset force for the reset rod 332. One end of the elastic conductive sheet 335 is fixed to the detection seat 331, and the other end passes through the through groove 337 and is fixed to the detection head 333. The distance between the two ends of the elastic conductive sheet 335 is less than its own length to form an arc-shaped structure.

[0031] The through slot 337 is configured such that when the radial runout of the lead screw is within a preset accuracy range, the elastic conductive sheet 335 does not contact the conductive layer; when the radial runout of the lead screw exceeds the preset accuracy range, the detection head 333 moves up / down, causing the elastic conductive sheet 335 to deform, making the elastic conductive sheet 335 contact the conductive layer and conduct electricity, generating a detection signal indicating that the lead screw is unqualified. During detection, the system can determine that the lead screw is unqualified if only one set of detection modules 330 in the detection assembly generates an unqualified signal. This detection device uses an elastic conductive sheet 335 deformation detection mechanism to replace the traditional displacement detection mechanism, triggering the on / off signal through the change of the conductive sheet's curvature, ensuring detection accuracy while greatly reducing the production cost of the equipment.

[0032] In the detection device, reference Figures 6 to 8The positioning mechanism 100 includes a positioning slide rail 110 and two sets of opposing positioning components slidably disposed on the positioning slide rail 110. Each positioning component includes a positioning base plate 120, on which a positioning seat 130 is mounted. A positioning block 131 is mounted on the positioning seat 130. The positioning block 131 has a positioning groove 132, which has a trumpet-shaped positioning surface 133. The positioning surface 133 is used to conform to the chamfer at the stepped end face of the lead screw to achieve positioning of the lead screw. This design offers good centering and is applicable to positioning lead screws of different outer diameters, demonstrating strong applicability.

[0033] Furthermore, the bottom of the positioning groove 132 is provided with a through hole 134 for the lead screw end to pass through the positioning block 131. This design facilitates the lead screw end to pass through, further enhancing the radial limiting of the lead screw and improving clamping stability. A bearing is provided between the positioning block 131 and the positioning seat 130 to allow the positioning block 131 to rotate relative to the positioning seat 130, so that the positioning block 131 can rotate with the lead screw, preventing the lead screw from deviating relative to the positioning block 131 during detection. The positioning base plate 120 is provided with a guide rod 121, and the positioning seat 130 is provided with a guide hole that cooperates with the guide rod 121. The cooperation between the guide rod 121 and the guide hole can prevent the positioning seat 130 from shaking and ensure the reliability of the movement of the positioning seat 130.

[0034] To further improve the applicability of the positioning mechanism 100, the positioning assembly also includes two lifting blocks 140, symmetrically arranged on both sides of the positioning seat 130. The positioning seat 130 has inclined contact surfaces A135 on both sides, with a first guide groove 136 formed on the contact surface A135. The lifting blocks 140 have contact surfaces B141 that conform to the contact surfaces A135, and a first guide rail 142 that mates with the first guide groove 136 on the contact surface B141. The positioning base plate 120 has a second guide rail 122, and the bottom of the lifting blocks 140 has a second guide groove 143 that mates with the second guide rail 122. This design enables height adjustment of the positioning seat 130 to accommodate the detection requirements of lead screws with different diameters.

[0035] Specifically, the positioning assembly further includes an adjusting rod 150, which comprises a limiting section 151 in the middle and threaded sections 152 on both sides. The threads on the two threaded sections 152 are opposite. One end of the adjusting rod 150 is provided with an adjusting handle 153. The positioning base plate 120 is provided with a limiting block 123, which is provided with a limiting groove 124 that mates with the limiting section 151. The lifting block 140 is provided with a threaded groove 144, and the two threaded sections 152 are respectively screwed into the threaded grooves 144 of the two sets of lifting blocks 140. By rotating the adjusting rod 150, the two sets of lifting blocks 140 can move synchronously to ensure positioning accuracy.

[0036] To accommodate the height adjustment function of the positioning mechanism 100, refer to Figure 5 The drive mechanism 200 includes a feed module 210, a lifting module 220, and a drive module 230. The feed module 210 is connected to the lifting module 220 to drive the lifting module 220 to move closer to / away from the lead screw. The lifting module 220 is connected to the drive module 230 to drive the drive module 230 to move up and down radially along the lead screw. The output end of the drive module 230 is connected to a drive wheel 231, which is used to abut against the outer peripheral surface of the lead screw to drive the lead screw to rotate. The lifting module 220 is provided with a lifting screw 221 screwed to the drive module 230, and the lifting screw 221 is provided with a lifting handle 222.

[0037] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A positioning mechanism for lead screw detection, characterized in that, The positioning mechanism (100) includes a positioning slide rail (110) and two sets of positioning components arranged opposite each other and slidably disposed on the positioning slide rail (110); The positioning component includes a positioning base plate (120), a positioning seat (130) is mounted on the positioning base plate (120), a positioning block (131) is mounted on the positioning seat (130), the positioning block (131) is provided with a positioning groove (132), the positioning groove (132) has a trumpet-shaped positioning surface (133), the positioning surface (133) is used to fit the chamfer at the end face of the step on the lead screw to achieve positioning of the lead screw.

2. The positioning mechanism for lead screw detection according to claim 1, characterized in that, The positioning assembly also includes two lifting blocks (140), symmetrically arranged on both sides of the positioning seat (130); the positioning seat (130) has inclined contact surfaces A (135) on both sides, and a first guide groove (136) is provided on the contact surface A (135); the lifting block (140) has a contact surface B (141) that fits the contact surface A (135), and a first guide rail (142) that matches the first guide groove (136) is provided on the contact surface B (141); the positioning base plate (120) has a second guide rail (122), and the bottom of the lifting block (140) has a second guide groove (143) that matches the second guide rail (122).

3. A positioning mechanism for lead screw detection according to claim 2, characterized in that, The positioning assembly also includes an adjusting rod (150), which includes a limiting section (151) in the middle and threaded sections (152) on both sides. The threads on the two threaded sections (152) are opposite, and an adjusting handle (153) is provided at one end of the adjusting rod (150). The positioning base plate (120) is provided with a limiting block (123), and the limiting block (123) is provided with a limiting groove (124) that matches the limiting section (151); the lifting block (140) is provided with a threaded groove (144), and two threaded sections (152) are respectively screwed to the threaded grooves (144) of the two sets of lifting blocks (140).

4. A positioning mechanism for lead screw detection according to claim 2, characterized in that, The positioning base plate (120) is provided with a guide rod (121), and the positioning seat (130) is provided with a guide hole that cooperates with the guide rod (121).

5. A positioning mechanism for lead screw detection according to claim 1, characterized in that, The bottom of the positioning groove (132) is provided with a through hole (134) through which the end of the lead screw of the positioning block (131) passes.

6. A positioning mechanism for lead screw detection according to claim 1, characterized in that, A bearing is provided between the positioning block (131) and the positioning seat (130) to allow the positioning block (131) to rotate relative to the positioning seat (130).

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