Screw total run-out detection device

Abstract

The invention relates to the technical field of screw detection, in particular to a screw total run-out detection device, which comprises a rotary driving assembly, a fixed detection assembly and a floating detection assembly, and is characterized in that the fixed detection assembly comprises a sliding seat and a fixed measuring head arranged on the sliding seat; the floating detection assembly comprises a floating measuring head which is installed on the sliding base in a floating mode in the radial direction and synchronously and axially moves along the screw along with the sliding base, and a detection element used for detecting the radial displacement of the floating measuring head. According to the invention, the fixed measuring head bears the axial driving force required by matching with the screw groove, stable axial following is provided for the floating measuring head, the floating measuring head only keeps radial contact with the screw rod, and the acting force borne by the floating measuring head is basically limited in the radial direction; therefore, the problem of radial response lag caused by the fact that a single measuring head bears the axial force and the radial force at the same time is avoided, the floating measuring head can accurately follow the radial runout change of the screw in real time, and the runout detection precision and reliability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of screw testing technology, and in particular to a screw full runout testing device. Background Technology

[0002] In screw-nut transmission structures, the ability to convert linear and rotary motion between each other is typically utilized to meet diverse transmission requirements. However, during the actual production of screws, due to the influence of processing technology and manufacturing precision, some areas of the screw have defects such as non-circular cross-sections, meaning that certain parts of the screw cannot form a complete circular cross-section. This defect causes periodic runout of the screw during rotation, thus affecting the smoothness and fitting accuracy of the transmission system. Therefore, runout detection of the screw becomes a crucial step in ensuring its quality and performance.

[0003] Currently, the runout detection structures used in existing technologies are typically configured as single-probe types. This probe must both engage with the screw groove to achieve its own axial displacement and perform radial runout measurement. During this measurement process, the probe is simultaneously subjected to both axial and radial forces exerted by the screw groove. The coupling effect of these two forces causes a delay in the probe's radial response, making it difficult to accurately and promptly follow changes in the screw's radial runout. Ultimately, this leads to reduced detection accuracy and fails to meet the quality control requirements for high-precision screws. Summary of the Invention

[0004] The technical problem to be solved by the present invention is as follows: In order to solve the problem that the existing screw runout detection structure usually adopts a single probe form, the probe must not only cooperate with the screw groove to realize its own axial displacement, but also measure the radial runout. Therefore, the probe is subjected to both axial force and radial force applied by the screw groove during the measurement process, resulting in a delay in the radial runout and a reduction in detection accuracy. The present invention provides a screw full runout detection device.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a screw full runout detection device, comprising: A rotary drive assembly is used to clamp the screw and drive the screw to rotate; A fixed detection assembly includes a slide and a fixed probe mounted on the slide and extending into the screw groove to make linear displacement along the screw axis during screw rotation and drive the slide to move synchronously. The floating detection assembly includes a floating probe that is radially floatingly mounted on the slide and moves synchronously axially along the screw along with the slide, and a detection element for detecting the radial displacement of the floating probe.

[0006] Furthermore, the floating detection assembly also includes a first elastic element, one end of which abuts against the slide block and the other end of which abuts against the floating probe.

[0007] Furthermore, the fixed detection assembly also includes a second elastic element, one end of which abuts against the slide and the other end of which abuts against the fixed probe, and the elastic coefficient of the second elastic element is greater than that of the first elastic element.

[0008] Furthermore, the fixed detection assembly also includes a fixed seat for mounting the fixed probe and which can be close to or away from the screw, and the floating detection assembly also includes a floating seat for mounting the floating probe and which can be close to or away from the screw. The fixed seat and the floating seat are distributed on both sides of the screw, and a separation assembly is provided between them to move them apart so as to remove the screw.

[0009] Furthermore, a fine-tuning mechanism is provided between the floating seat and the floating probe to allow the floating probe to float along the screw axis.

[0010] Furthermore, the separation assembly includes a pressure rod hinged to the slide and a top rod movably connected to the pressure rod to achieve lifting and lowering during the swinging of the pressure rod, the top rod having a top opening portion that pushes between the fixed seat and the floating seat to separate the two.

[0011] Furthermore, the rotary drive assembly includes two tips abutting at both ends of the screw to clamp the screw, and a rotary drive source for connecting to one of the tips.

[0012] Furthermore, the two tips are a fixed tip and a movable tip that can move closer to or further away from the fixed tip. The rotary drive assembly also includes a pushing mechanism for moving the movable tip closer to the fixed tip to clamp the screw located between the two, and a pushing mechanism for moving the movable tip away from the fixed tip.

[0013] Furthermore, an angular contact bearing is installed between the fixed tip and the fixed bracket for mounting thereon, and an angular contact bearing is also installed between the movable tip and the movable bracket for mounting thereon.

[0014] Furthermore, the pushing mechanism includes a cam seat and a cam body mounted on the cam seat for abutting against the movable support.

[0015] The beneficial effects of this invention are as follows: This invention utilizes a fixed probe to bear the axial driving force required for mating with the screw groove, providing stable axial following for the floating probe. The floating probe only maintains radial contact with the screw, and the force it experiences is basically limited to the radial direction. This avoids the problem of radial response lag caused by a single probe bearing both axial and radial forces simultaneously, enabling the floating probe to follow the radial runout changes of the screw in real time and accurately, thereby significantly improving the accuracy and reliability of runout detection. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a three-dimensional schematic diagram from a first perspective of the present invention; Figure 2 This is a three-dimensional schematic diagram from a second perspective of the present invention; Figure 3 This is a top view of the present invention; Figure 4 yes Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a three-dimensional schematic diagram of the present invention removing the rotation drive component; Figure 6 This is a top view of the present invention with the rotary drive component removed; Figure 7 This is a three-dimensional schematic diagram from a first perspective when the separating component and the slide are engaged in the present invention; Figure 8 This is a three-dimensional schematic diagram from a second perspective when the separating component and the slide are engaged in the present invention; Figure 9 This is a three-dimensional schematic diagram of the separation component in this invention.

[0018] In the picture: 1. Rotary drive assembly; 101. Rotary drive source; 102. Fixed center; 103. Movable center; 104. Angular contact bearing; 105. Pushing mechanism; 106. Pushing-away mechanism; 1061. Cam seat; 1062. Cam body; 1063. Handle; 107. Fixed bracket; 108. Movable bracket; 109. Ball bearing; 2. Fixed detection assembly; 201. Slide; 2011. Guide hole; 202. Fixed probe; 203. Second elastic element; 204. Fixed base; 205. Second guide rod; 3. Floating detection assembly; 301. Floating probe; 302. Detection element; 303. First elastic element; 304. Floating seat; 305. Fine-tuning mechanism; 306. First guide rod; 4. Separation assembly; 401. Pressure rod; 4011. Waist-shaped groove; 402. Push rod; 4021. Top opening part; 4022. Insertion part; 4023. Limiting part; 5. Screw; 6. Base. Detailed Implementation

[0019] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0020] like Figures 1-9 As shown, a screw runout detection device includes a base 6, on which a rotary drive assembly 1, a fixed detection assembly 2 and a floating detection assembly 3 are mounted; The rotary drive assembly 1 is used to clamp the screw 5 and drive the screw 5 to rotate. The fixed detection assembly 2 includes a slide block 201 and a fixed probe 202 mounted on the slide block 201 and extending into the screw groove of the screw 5 so as to make linear displacement along the axial direction of the screw 5 during the rotation of the screw 5 and drive the slide block 201 to move synchronously. The fixed probe 202 cooperates with the screw groove of the screw 5 and is always kept in the screw groove, thereby converting the rotation of the screw 5 into its own linear motion. A slide rail is mounted on the base 6, and a slider that cooperates with the slide rail is mounted on the bottom of the slide block 201. The floating detection assembly 3 includes a floating probe 301 that is radially floatingly mounted on the slide 201 and moves synchronously along the screw 5 with the slide 201, and a detection element 302 for detecting the radial displacement of the floating probe 301. The detection element 302 can be a dial indicator. In this case, the force of the axial displacement of the floating probe 301 is not provided by the rotating screw 5. The floating probe 301 and the screw 5 have no axial interaction force, only radial interaction force. Therefore, the floating probe 301 is not subject to the axial thrust of the screw 5 during measurement, thereby avoiding interference with radial runout.

[0021] During operation, the screw 5 is first clamped by the rotary drive assembly 1. At this time, both the fixed probe 202 and the floating probe 301 are located in the screw groove of the screw 5. Then, the screw 5 rotates, and the fixed probe 202 cooperates with the screw groove to convert the rotation of the screw 5 into its own linear motion, which drives the slide 201 to move synchronously. The floating probe 301 installed on the slide 201 moves synchronously along the axial direction of the screw 5. That is, the fixed probe 202 provides axial driving force for the floating probe 301. There is only radial force between the floating probe 301 and the screw 5, thereby improving the runout detection accuracy.

[0022] In some examples, the floating detection assembly 3 further includes a first elastic element 303 for allowing the floating probe 301 to float radially. The first elastic element 303 may be a spring. One end of the first elastic element 303 abuts against the slide 201, and the other end abuts against the floating probe 301. In order to improve the motion accuracy of the floating probe 301, a first guide rod 306 is installed between the slide 201 and the floating probe 301, and the first elastic element 303 is sleeved on the first guide rod 306.

[0023] In some examples, the fixed detection assembly 2 further includes a second elastic element 203, which may be a spring. One end of the second elastic element 203 abuts against the slide 201, and the other end abuts against the fixed probe 202. To improve the movement accuracy of the fixed probe 202, a second guide rod 205 is installed between the slide 201 and the fixed probe 202. The second elastic element 203 is sleeved on the second guide rod 205, and the elastic coefficient of the second elastic element 203 is much greater than that of the first elastic element 203. The larger the elastic coefficient, the greater the elastic force and the less likely it is to deform. The first elastic element 303 with a small elastic coefficient is a "soft" spring, and the second elastic element 203 with a large elastic coefficient is a "hard" spring. The elastic coefficient is related to the wire diameter, outer diameter and material of the spring. Therefore, the fixed probe 202 is not absolutely "fixed". It can also float to a certain extent in the radial direction. It only needs to be located in the screw groove to cooperate with the screw groove. This avoids the fixed probe 202 from being dislodged from the screw groove or being damaged by the screw groove due to excessive runout of the screw 5.

[0024] In some examples, the fixed detection assembly 2 further includes a fixed base 204 for mounting the fixed probe 202 and which can be close to or away from the screw 5. A slide rail slider assembly is installed between the fixed base 204 and the slide 201, and a second elastic element 203 is installed between the fixed base 204 and the slide 201. The floating detection assembly 3 also includes a floating seat 304 for mounting the floating probe 301 and being able to approach or move away from the screw 5. A slide rail and slider assembly is also installed between the floating seat 304 and the slide 201. A first elastic element 303 is installed between the floating seat 304 and the slide 201. The fixed seat 204 and the floating seat 304 are distributed on both sides of the screw 5. A separation component 4 is provided between them to move them apart so that the screw 5 can be removed. The separation component 4 can separate the fixed seat 204 and the floating seat 304, so that the fixed probe 202 on the fixed seat 204 and the floating probe 301 on the floating seat 304 move away from each other and are disengaged from the screw groove. At this time, the screw 5 can be removed. The fixed seat 204 and the floating seat 304 are arranged opposite to each other so that the fixed probe 202 and the floating probe 301 on them are also arranged opposite to each other. They support the two sides of the screw 5 respectively, so that the screw 5 is subjected to more balanced force, thereby improving the detection accuracy of the whole process.

[0025] In some examples, a fine-tuning mechanism 305 is provided between the floating seat 304 and the floating probe 301 to allow the floating probe 301 to float along the axial direction of the screw 5, that is, to allow the floating probe 301 to sway slightly in the screw groove, thereby further reducing the axial force between the floating probe 301 and the screw groove to improve the runout detection accuracy. The fine-tuning mechanism 305 is a cross roller guide.

[0026] In some examples, the separation assembly 4 includes a pressure rod 401 hinged to the slide 201 and a push rod 402 movably connected to the pressure rod 401 to achieve lifting and lowering during the swinging of the pressure rod 401. The push rod 402 has a top opening portion 4021 that pushes between the fixed seat 204 and the floating seat 304 to separate the two. The cross section of the top opening portion 4021 may be, but is not limited to, an arc shape or a cone shape. It only needs to satisfy the condition that the top is smaller than the bottom so that the fixed seat 204 and the floating seat 304 can be separated when the push rod 402 moves upward. To save effort, the pressure rod 401 has a bent structure. One end of the pressure rod 401 is a pressing end and the other end is a follower end. The follower end has a waist-shaped groove 4011. The top opening part 4021 is located at the top of the top rod 402. The bottom of the top rod 402 protrudes to form an insertion part 4022 for inserting into the waist-shaped groove 4011 and movably cooperating with the waist-shaped groove 4011. The insertion part 4022 has a circular cross section. The insertion part 4022 can be separately set with the top rod 402 or integrally formed. The slide 201 has a guide hole 2011 for the top rod 402 to pass through and guide its lifting and lowering movement. At the same time, the part of the top rod 402 above the guide hole 2011 protrudes to form a limiting part 4023 for limiting the lifting and lowering stroke of the top rod 402. During operation, first press down the pressing end of the pressure rod 401. The follower end of the pressure rod 401 tilts upward. The waist-shaped groove 4011 of the pressure rod 401 and the insertion part 4022 of the push rod 402 move together to drive the push rod 402 upward. The opening part 4021 of the push rod 402 opens the fixed seat 204 and the floating seat 304. At this time, the fixed probe 202 and the floating probe 301 move away from each other and disengage from the screw groove. At this time, the screw 5 can be removed. Finally, release the pressing end. The fixed seat 204 and the floating seat 304 are reset under the action of the first elastic element 303 and the second elastic element 203 respectively, thereby pressing down the push rod 402 and resetting the pressure rod 401.

[0027] In some examples, the rotary drive assembly 1 includes two tips at both ends of the screw 5 to clamp the screw 5 and a rotary drive source 101 for connecting to one of the tips. The two tips are respectively inserted into the top holes at both ends of the screw 5 to clamp the screw 5. The rotary drive source 101 can be an electric structure or a manual structure. In this embodiment, it is a manual structure, i.e., a handwheel.

[0028] In some examples, the two tips are a fixed tip 102 and a movable tip 103 that can move closer to or further away from the fixed tip 102. Of course, both tips can also be movable tips 103. In this embodiment, in order to simplify the overall structure, the two tips are one stationary and one movable. The rotary drive assembly 1 further includes a pushing mechanism 105 for moving the movable tip 103 closer to the fixed tip 102 to clamp the screw 5 located between them, and a pushing mechanism 106 for moving the movable tip 103 away from the fixed tip 102. The pushing mechanism 105 can specifically be a slide structure, with a compression spring installed inside (see attached diagram). Figure 2 (Not shown), under the elastic force of the compression spring, the pushing mechanism 105 can press the movable tip 103 against the screw 5 to stably clamp the screw 5, thereby causing the fixed tip 102, the screw 5 and the movable tip 103 to rotate synchronously; after the screw 5 has finished testing, the pushing mechanism 106 can push the movable tip 103 away from the screw 5, thereby removing the screw 5.

[0029] In some examples, an angular contact bearing 104 and a ball bearing 109 are installed between the fixed tip 102 and the fixed bracket 107 for which it is mounted, and an angular contact bearing 104 and a ball bearing 109 are also installed between the movable tip 103 and the movable bracket 108 for which it is mounted. By adjusting the preload of the angular contact bearing 104, the axial clearance between the two tips can be eliminated, thereby ensuring clamping accuracy.

[0030] In some examples, the pushing mechanism 106 includes a cam seat 1061 mounted on the base 6, a cam body 1062 mounted on the cam seat 1061 and for abutting against the movable bracket 108, and a handle 1063 for driving the cam body 1062 to rotate. The cam seat 1061 is adjustablely mounted on the base 6. Specifically, the base 6 has an elongated groove, a bolt passes through the elongated groove from the bottom of the base 6 and is threadedly connected to the cam seat 1061, and a nut abuts against the base 6 to fix the cam seat 1061. The position of the cam seat 1061 can be adjusted by adjusting the position of the bolt in the elongated groove.

[0031] After the screw 5 has been inspected, turn the handle 1063 to drive the cam body 1062 to rotate, which will push the movable bracket 108 and its movable tip 103 to move away from the screw 5, thereby releasing the screw 5 from clamping.

[0032] Working principle: During operation, the screw 5 to be tested is first installed between the fixed center 102 and the movable center 103, and the movable center 103 is pressed against the screw 5 by the pushing mechanism 105 to stably clamp the screw 5. At this time, the fixed probe 202 and the floating probe 301 are both located in the screw groove of the screw 5. Next, the rotary drive source 101 is started, which drives the screw 5 to rotate. The fixed probe 202 cooperates with the screw groove to convert the rotation of the screw 5 into its own linear motion, and drives the slide 201 to move synchronously. The floating probe 301 installed on the slide 201 moves synchronously along the axial direction of the screw 5. The floating probe 301 floats radially under the elastic force of the first elastic element 303 to perform full runout detection on the screw 5. Finally, pressing down on the pressing end of the pressure rod 401 causes the follower end of the pressure rod 401 to tilt upwards. The waist-shaped groove 4011 of the pressure rod 401 engages with the insertion part 4022 of the push rod 402 to move the push rod 402 upwards. The opening part 4021 of the push rod 402 separates the fixed seat 204 and the floating seat 304. At this time, the fixed probe 202 and the floating probe 301 move away from each other and disengage from the screw groove. Simultaneously, rotating the handle 1063 causes the cam body 1062 to rotate, pushing the movable bracket 108 and its movable tip 103 to move away from the screw 5, thereby releasing the screw. The screw 5 is clamped, and at this time the screw 5 can be taken out and a new screw 5 to be tested can be installed. Then, the handle 1063 is rotated in the opposite direction, and the cam body 1062 releases the pressure on the movable bracket 108. The movable bracket 108 and its movable tip 103 are pressed against the screw 5 again under the action of the pushing mechanism 105 so that the screw 5 is stably clamped. The pressing end is released, and the fixed seat 204 and the floating seat 304 are reset under the action of the first elastic element 303 and the second elastic element 203 respectively, thereby pressing down the top rod 402 and resetting the pressure rod 401. The above process is repeated for a new round of testing.

[0033] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A screw runout detection device, characterized in that: include: A rotary drive assembly (1) is used to clamp the screw (5) and drive the screw (5) to rotate; The fixed detection assembly (2) includes a slide (201) and a fixed probe (202) mounted on the slide (201) and extending into the screw groove of the screw (5) to make linear displacement along the axial direction of the screw (5) during the rotation of the screw (5) and drive the slide (201) to move synchronously. The floating detection assembly (3) includes a floating probe (301) that is radially floatingly mounted on the slide (201) and moves synchronously along the screw (5) with the slide (201), and a detection element (302) for detecting the radial displacement of the floating probe (301).

2. The screw runout detection device according to claim 1, characterized in that: The floating detection component (3) further includes a first elastic element (303), one end of which abuts against the slide (201) and the other end of which abuts against the floating probe (301).

3. The screw runout detection device according to claim 2, characterized in that: The fixed detection component (2) further includes a second elastic element (203), one end of which abuts against the slide (201) and the other end of which abuts against the fixed probe (202), and the elastic coefficient of the second elastic element (203) is greater than the elastic coefficient of the first elastic element (303).

4. The screw runout detection device according to claim 3, characterized in that: The fixed detection assembly (2) further includes a fixed seat (204) for mounting the fixed probe (202) and which can be close to or away from the screw (5). The floating detection assembly (3) further includes a floating seat (304) for mounting the floating probe (301) and which can be close to or away from the screw (5). The fixed seat (204) and the floating seat (304) are distributed on both sides of the screw (5), and a separation assembly (4) is provided between them to move them away from each other so as to remove the screw (5).

5. The screw runout detection device according to claim 4, characterized in that: A fine-tuning mechanism (305) is provided between the floating seat (304) and the floating probe (301) to allow the floating probe (301) to float along the screw (5) axis.

6. The screw runout detection device according to claim 4, characterized in that: The separation assembly (4) includes a pressure rod (401) hinged to the slide (201) and a top rod (402) movably connected to the pressure rod (401) to achieve lifting and lowering during the swinging of the pressure rod (401). The top rod (402) has a top opening (4021) that pushes between the fixed seat (204) and the floating seat (304) to open the two apart.

7. The screw runout detection device according to claim 1, characterized in that: The rotary drive assembly (1) includes two tips at both ends of the screw (5) to clamp the screw (5) and a rotary drive source (101) for connecting to one of the tips.

8. The screw runout detection device according to claim 7, characterized in that: The two tips are a fixed tip (102) and a movable tip (103) that can move closer to or away from the fixed tip (102). The rotary drive assembly (1) also includes a pushing mechanism (105) for moving the movable tip (103) closer to the fixed tip (102) to clamp the screw (5) located between the two, and a pushing mechanism (106) for moving the movable tip (103) away from the fixed tip (102).

9. A screw runout detection device according to claim 8, characterized in that: An angular contact bearing (104) is installed between the fixed tip (102) and the fixed bracket (107) for which it is mounted, and an angular contact bearing (104) is also installed between the movable tip (103) and the movable bracket (108) for which it is mounted.

10. A screw runout detection device according to claim 9, characterized in that: The push-off mechanism (106) includes a cam seat (1061) and a cam body (1062) mounted on the cam seat (1061) and used to abut against the movable support (108).

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