Coil spring pitch detection device

Abstract

The purpose of the present invention is to provide a coil spring pitch detection device, which solves the problem of difficulty in detecting the natural state of the coil spring pitch. The device includes a chassis, a drive assembly and a detection assembly. The drive assembly and the detection assembly are both arranged on the chassis. The positioning head is used to fix the inner end of the coil spring. Since the motor outputs mechanical power through the drive rod, the motor drives the drive rod to rotate. The speed and torque of the drive rod have rated values. When the drive rod drives the coil spring to contract, the torque of the drive rod will change, and the coil spring drives the slide to move. When the torque of the drive rod changes to a set range, the motor stops rotating and the slide is stationary. At this time, the distance moved by the slide is checked. If this distance reaches the set range, it means that the coil spring pitch is qualified. If the distance moved by the slide is not within the set range, it means that the coil spring pitch is unqualified. Therefore, the problem of difficulty in detecting the natural state of the coil spring pitch is solved.

Description

Technical Field

[0001] The present invention relates to the field of spring detection, in particular to a coil spring pitch detection device. Background Art

[0002] Vortex springs are also called coil springs. In recent years, due to the improvement of quality standards in the entire domestic automotive industry, the corresponding requirements for noise, vibration and acoustic roughness of automotive coil springs have also gradually increased. Automobile manufacturers require that coil springs be tested for locking or abnormal noise when in working condition.

[0003] Since the coil spring is in a contracted state during operation, and in actual design engineering, the force value is required to be

[0004] In order to meet the requirements of the product quality and appearance size, coil springs are often designed with non-uniform pitches. This makes it impossible to pass the test and use the pitch of the coil spring in the natural expansion state to determine whether the pitch in the working state (contraction state) is qualified, and whether it will cause locking or abnormal noise.

[0005] How to detect and determine whether the pitch between adjacent coils of the coil spring in the working state meets the process requirements needs to be solved. Summary of the Invention

[0006] The purpose of the present invention is to provide a coil spring pitch detection device, which solves the problem of difficulty in detecting the natural state of the coil spring pitch.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention provides a coil spring pitch detection device, comprising a chassis, a drive assembly, and a detection assembly, both of which are disposed on the chassis. The drive assembly comprises a motor, a drive rod, and a positioning head, the motor being disposed on the chassis. The two ends of the drive rod are respectively connected to the drive end of the motor and the positioning head, and the positioning head is used to fix the inner end of the coil spring.

[0009] The detection assembly includes a first clamping plate, a second clamping plate, a slide plate and a limit block, the first clamping plate and the second clamping plate are arranged side by side with a spacing, the slide plate is slidably arranged on the first clamping plate and the second clamping plate, the limit block is arranged on the slide plate, and the limit block is used to fix the outer end of the coil spring;

[0010] The driving rod is located in the sliding direction of the slide plate, and the slide plate has two states: close to and away from the driving rod.

[0011] Optionally, the detection assembly further includes a torque sensor, and the torque sensor is used to detect the torque of the driving rod.

[0012] Optionally, a first scale is provided on the first clamping plate, a second scale is provided on the second clamping plate, the first scale and the second scale are arranged side by side, and the slide plate is located between the first scale and the second scale.

[0013] Optionally, the detection assembly further includes a limit plate, which is located on the moving path of the slide. The end of the slide has a concave surface, which is arranged opposite to the limit plate.

[0014] Optionally, a first slide groove and a second slide groove are provided on the slide plate, the first slide groove and the second slide groove are arranged back to back, the first clamping plate has a first guide plate, the second clamping plate has a second guide plate, the first guide plate is clamped in the first slide groove, and the second guide plate is clamped in the second slide groove.

[0015] Optionally, the detection assembly further includes a limit plate, the limit plate having a hollow and a limit opening, the limit opening being communicated with the hollow, the drive rod being sleeved in the hollow, and the first clamping plate and the second clamping plate being clamped in the limit opening.

[0016] Optionally, the positioning head includes a left column, a middle column and a right column, the middle column is arranged between the left column and the right column, there is a gap between the left column and the middle column, and there is a gap between the right column and the middle column.

[0017] Furthermore, a pressing assembly is provided on the chassis, and the pressing assembly includes a support plate, a cylinder and a pressure rod. The cylinder is provided on the support plate, the pressure rod is connected to the driving end of the cylinder, and the center column is located on the moving path of the pressure rod.

[0018] Furthermore, a positioning groove is provided on the center column, and the pressure rod has two states: entering into and moving away from the positioning groove.

[0019] Furthermore, the pressing assembly further includes a pressing plate, which is arranged on the pressing rod, and the pressing rod passes through the pressing plate.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] A coil spring pitch detection device of the present invention outputs mechanical power through a drive rod, and the motor drives the drive rod to rotate. The speed and torque of the drive rod both have rated values. When the drive rod drives the coil spring to contract, the torque of the drive rod will change, and the coil spring drives the slide plate to move. When the torque of the drive rod changes to within a set range, the motor stops rotating and the slide plate stops. At this time, the distance moved by the slide plate is checked. If this distance is within the set range, it means that the coil spring pitch is qualified. If the distance moved by the slide plate is not within the set range, it means that the coil spring pitch is unqualified. Therefore, the problem of difficulty in detecting the natural state of the coil spring pitch is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an illustrative and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0023] Figure 1 is a three-dimensional view of a preferred embodiment of a coil spring pitch detection device according to the present invention;

[0024] Figure 2 yes Figure 1 Another perspective stereoscopic view is shown;

[0025] Figure 3 This is an enlarged view of the drive component and detection component structure;

[0026] Figure 4 yes Figure 3 The slide is shown separated from the first and second cleats;

[0027] Figure 5 yes Figure 1 An enlarged view of the positioning head is shown;

[0028] Figure 6 It is a three-dimensional view of the limit plate;

[0029] Figure 7 It is a schematic diagram of the fixed state of the coil spring.

[0030] The description of the accompanying drawings is as follows:

[0031] 1. Chassis; 2. Drive assembly; 3. Detection assembly; 4. Pressing assembly; 5. Coil spring; 21. Motor; 22. Drive rod; 23. Positioning head; 31. First clamping plate; 32. Second clamping plate; 33. Slide plate; 34. Stop block; 35. Torque sensor; 36. Stop plate; 37. Stop plate; 41. Support plate; 42. Cylinder; 43. Press rod; 44. Press plate; 220. Positioning slot; 231. Left Column; 232, middle column; 233, right column; 234, limiting part; 235, first fixed surface; 236, second fixed surface; 237, left fixed surface; 238, right fixed surface; 311, first scale; 321, second scale; 330, concave surface; 331, first slide groove; 332, second slide groove; 312, first guide plate; 322, second guide plate; 371, hollow; 372, limiting opening. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1 and Figure 2 and Figure 3 As shown, a coil spring pitch detection device includes a chassis 1, a drive component 2 and a detection component 3. The drive component 2 and the detection component 3 are both arranged on the chassis 1. The drive component 2 includes a motor 21, a drive rod 22 and a positioning head 23. The motor 21 is arranged inside the chassis 1. The two ends of the drive rod 22 are respectively connected to the drive end of the motor 21 and the positioning head 23. The drive rod 22 is vertically arranged and passes through the chassis 1 upward. The top end of the drive rod 22 is used to place the coil spring, and the positioning head 23 is used to fix the inner end of the coil spring. After the detection is completed, the coil spring is removed from the positioning head 23.

[0036] The motor 21 is a servo motor. The driving end of the motor 21 drives the driving rod 22 to rotate, and the driving rod 22 drives the coil spring to contract. The motor 21 is connected to the PLC controller (not shown in the figure) by signal.

[0037] The detection assembly 3 includes a first clamping plate 31, a second clamping plate 32, a slide 33 and a limit block 34. The first clamping plate 31 and the second clamping plate 32 are arranged in parallel with a distance. There is a distance between the first clamping plate 31 and the second clamping plate 32. The slide 33 is slidably set on the first clamping plate 31 and the second clamping plate 32. The slide 33 is located between the first clamping plate 31 and the second clamping plate 32, and the slide 33 moves between the first clamping plate 31 and the second clamping plate 32.

[0038] The limit block 34 is set on the slide 33. The limit block 34 is used to fix the outer end of the coil spring. Before testing, the coil spring is first laid flat on the top of the driving rod 22. The top of the driving rod 22 is a plane. The positioning head 23 is located in the middle position of the driving rod 22. The inner and outer ends of the coil spring are fixed. The coil spring is in a natural state. The initial position of the slide 33 is determined. When the driving rod 22 rotates and drives the coil spring to contract, the coil spring drives the slide 33 to move through the limit block 34 until the driving rod 22 reaches the set torque range.

[0039] At this time, check the distance from the slide plate 33 to the initial position. If the distance moved by the slide plate 33 is within the set range, it means that the coil spring pitch is qualified. If the distance moved by the slide plate 33 is not within the set range, it means that the coil spring pitch is unqualified.

[0040] The driving rod 22 is located in the sliding direction of the slide plate 33, and the slide plate 33 will not contact the driving rod 22. The slide plate 33 has two states: close to and far away from the driving rod 22. When the slide plate 33 is in the initial position before detection, the slide plate 33 is far away from the driving rod 22. During the detection process, the slide plate 33 gradually approaches the driving rod 22 until the motor 21 stops rotating.

[0041] The detection component 3 also includes a torque sensor 35, which is arranged on the drive rod 22. In this example, the torque sensor 35 is located in the chassis 1. The torque sensor 35 is connected to the PLC controller signal. The torque sensor 35 is used to detect the torque of the drive rod 22. The torque sensor 35 transmits the detected torque data to the PLC controller in real time. When the torque of the drive rod 22 reaches the set range, the PLC controller sends an instruction to the motor 21, and the motor 21 stops rotating. At this time, the drive rod 22 stops rotating and the coil spring stops contracting.

[0042] A first scale 311 is provided on the first clamping plate 31, and a second scale 321 is provided on the second clamping plate 32. The first scale 311 and the second scale 321 are both length scales. The first scale 311 and the second scale 321 are arranged in parallel, and the slide 33 is located between the first scale 311 and the second scale 321. The initial position of the slide 33 is determined according to the size of the coil spring. There is an observation line on the slide 33 that is aligned with the limit block 34. The observation line of the limit block 34 is aligned with the first scale 311 and the second scale 321 as the initial position of the slide 33. Then, under the drive of the motor 21, the drive rod 22 drives the coil spring to contract through the positioning head 23, and the coil spring drives the slide 33 to move through the limit block 34. After the torque sensor 35 detects that the torque of the drive rod 22 is within the set range, the motor 21 and the drive rod 22 stop rotating, the coil spring stops contracting, and the slide 33 stops moving.

[0043] Then check that the observation line of the slide 33 is aligned with the scale values ​​on the first scale 311 and the second scale 321, read the distance moved by the slide 33, and verify whether the distance moved by the slide 33 is within the set range. The first scale 311 and the second scale 321 are used to measure the distance moved by the slide 33.

[0044] A pressing assembly 4 is provided on the chassis 1, and the pressing assembly 4 includes a support plate 41, a cylinder 42 and a pressure rod 43. The cylinder 42 is provided on the support plate 41, and the support plate 41 is provided on the chassis 1. The cylinder 42 is connected to the PLC controller signal, the pressure rod 43 is connected to the driving end of the cylinder 42, and the positioning head 23 is located on the moving path of the pressure rod 43.

[0045] Before the coil spring is tested, the cylinder 42 drives the pressure rod 43 to descend to a set height, and the bottom end of the pressure rod 43 does not contact the top end of the center column 232. The distance between the bottom end of the pressure rod 43 and the top end of the center column 232 is small enough, and this distance is smaller than the height of the coil spring. Even if the coil spring jumps, it cannot jump out from between the bottom end of the pressure rod 43 and the top end of the center column 232.

[0046] A positioning groove 220 is provided on the middle column 232, and the pressure rod 43 has two states: entering and moving away from the positioning groove 220. To prevent the coil spring from being stuck between the bottom end of the pressure rod 43 and the top end of the middle column 232, the pressure rod 43 descends into the positioning groove 220. The pressure rod 43 does not contact the wall where the positioning groove 220 is located, so that the coil spring will not be stuck. After the detection is completed, the pressure rod 43 is reset and moves away from the positioning groove 220.

[0047] The pressing assembly 4 also includes a pressure plate 44, which is arranged on the pressure rod 43. The pressure rod 43 passes through the pressure plate 44. To prevent the coil spring from jumping, the pressure plate 44 is lowered to a set height together with the pressure rod 43. The pressure plate 44 is flat on the driving rod 22. The coil spring is between the pressure plate 44 and the top of the driving rod 22. The pressure plate 44 does not abut against the coil spring. The coil spring can jump slightly, but after jumping, it is blocked by the pressure plate 44 and the coil spring needs to be reset.

[0048] The detection component 3 also includes a limit plate 36, which is bent and located on the moving path of the slide 33. When the slide 33 moves back and forth, in order to prevent the slide 33 from falling off the first clamping plate 31 and the second clamping plate 32, the limit plate 36 serves to block the movement of the slide 33. The bent limit plate 36 has a slight elasticity, so that the limit plate 36 will not bend and deform. The distance between the limit plate 36 and the slide 33 is adjustable so that the limit plate 36 is suitable for coil springs of different sizes.

[0049] like Figure 4 As shown, the end of the skateboard 33 has a concave surface 330, which is arranged back to back with the limit plate 36. The concave surface 330 is close to the drive rod 22. The concave surface 330 and the limit plate 36 are located at both ends of the skateboard 33. In this example, the concave surface 330 is an inner curved surface, and the shape and size of the concave surface 330 match the outer periphery of the drive rod 22.

[0050] In addition, the concave surface 330 can also be a groove, which also matches the outer periphery of the drive rod 22. The drive rod 22 is a cylinder, so when the slide plate 33 moves toward the drive rod 22, the drive rod 22 can be located in the groove. This is when the slide plate 33 is closest to the drive rod 22, and it is also when the pitch of the coil spring is the smallest.

[0051] The first slide groove 331 and the second slide groove 332 are provided on the slide plate 33. The first slide groove 331 and the second slide groove 332 are arranged back to back. The first slide groove 331 and the second slide groove 332 are located on both sides of the slide plate 33. The first clamping plate 31 has a first guide plate 312, and the second clamping plate 32 has a second guide plate 322. The first guide plate 312 is clamped in the first slide groove 331, and the second guide plate 322 is clamped in the second slide groove 332. When the slide plate 33 moves, the first guide plate 312 moves relatively in the first slide groove 331, and the second guide plate 322 moves relatively in the second slide groove 332. The first guide plate 312 and the second guide plate 322 not only play a limiting role, but also play a fixing role to prevent the slide plate 33 from falling off from the first clamping plate 31 and the second clamping plate 32 in the vertical direction.

[0052] The slide plate 33 can be separated from the first clamping plate 31 and the second clamping plate 32 only in the moving direction.

[0053] like Figure 5As shown, the positioning head 23 includes a left column 231, a middle column 232 and a right column 233. The middle column 232 is arranged between the left column 231 and the right column 233. There is a gap between the left column 231 and the middle column 232, and there is a gap between the right column 233 and the middle column 232. The inner end part of the coil spring is wound around the left column 231, the middle column 232 and the right column 233. There is a gap between the left column 231 and the middle column 232 for inserting the coil spring, and there is a gap between the right column 233 and the middle column 232 for inserting the coil spring.

[0054] The center column 232 has a first fixing surface 235 and a second fixing surface 236 disposed opposite to each other. The center column 232 also has a limiting portion 234, which can play a positioning role. The inner end of the coil spring abuts against the limiting portion 234, which is located at the end of the first fixing surface 235. The left column 231 has a left fixing surface 237, and the right column 233 has a right fixing surface 238. The left fixing surface 237 is disposed opposite to the first fixing surface 235, and the right fixing surface 238 is disposed opposite to the second fixing surface 236. The inner end of the coil spring is wound around the center column 232. At the same time, the inner end of the coil spring is fixed between the left fixed surface 237 and the first fixed surface 235, and the inner end of the coil spring is also fixed between the right fixed surface 238 and the second fixed surface 236. The limiting portion 234 helps the inner end of the coil spring to bend and wind, so that the inner end of the coil spring is fixed more firmly. The left fixed surface 237, the right fixed surface 238, the first fixed surface 235 and the second fixed surface 236 increase the force area of ​​the inner end of the coil spring when it is wound, so that the inner end of the coil spring is not easy to fall off.

[0055] like Figure 6 As shown, the detection component 3 also includes a limit plate 37, the limit plate 37 has a hollow 371 and a limit opening 372, the limit plate 37 is fixed on the chassis 1, the limit opening 372 is communicated with the hollow 371, the drive rod 22 is sleeved in the hollow 371, the drive rod 22 rotates in the hollow 371, the first clamping plate 31 and the second clamping plate 32 are clamped in the limit opening 372, the limit opening 372 is set on the outer periphery of the limit plate 37, the slide plate 33 can be moved into the limit opening 372, or away from the limit opening 372, the first clamping plate 31 and the second clamping plate 32 are respectively clamped on both sides of the limit opening 372.

[0056] The top of the limiting plate 37 is flush with the top of the driving rod 22 , so that the driving rod 22 can be adapted for coil springs of various diameters, and coil springs with larger diameters are placed on the limiting plate 37 .

[0057] like Figure 7 As shown, the coil spring 5 is laid flat on the top of the driving rod 22 and the limit plate 37, the outer end of the coil spring 5 is clamped on the limit block 34, and the inner end of the coil spring 5 is clamped between the left column 231, the middle column 232 and the right column 233.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coil spring pitch detection device, comprising a chassis (1), a drive assembly (2) and a detection assembly (3), wherein the drive assembly (2) and the detection assembly (3) are both arranged on the chassis (1), and characterized in that: The driving assembly (2) comprises a motor (21), a driving rod (22) and a positioning head (23); the motor (21) is arranged on the chassis (1); two ends of the driving rod (22) are respectively connected to the driving end of the motor (21) and the positioning head (23); the positioning head (23) is used to fix the inner end of the coil spring; The detection assembly (3) includes a first clamping plate (31), a second clamping plate (32), a slide plate (33) and a limit block (34), wherein the first clamping plate (31) and the second clamping plate (32) are arranged in parallel with each other at a distance, the slide plate (33) is slidably arranged on the first clamping plate (31) and the second clamping plate (32), and the limit block (34) is arranged on the slide plate (33), and the limit block (34) is used to fix the outer end of the coil spring; The driving rod (22) is located in the sliding direction of the slide plate (33), and the slide plate (33) has two states: close to and away from the driving rod (22); The driving rod (22) drives the coil spring to contract through the positioning head (23), and the coil spring drives the slide plate (33) to move through the limit block (34). When the torque of the driving rod (22) changes within a set range, the distance moved by the slide plate (33) is used to judge whether the coil spring pitch is qualified.

2. The coil spring pitch detection device according to claim 1, characterized in that: The detection assembly (3) further comprises a torque sensor (35), and the torque sensor (35) is used to detect the torque of the driving rod (22).

3. The coil spring pitch detection device according to claim 1, characterized in that: The first clamping plate (31) is provided with a first scale (311), the second clamping plate (32) is provided with a second scale (321), the first scale (311) and the second scale (321) are arranged in parallel, and the slide plate (33) is located between the first scale (311) and the second scale (321).

4. The coil spring pitch detection device according to claim 1, characterized in that: The detection assembly (3) further comprises a limit plate (36), wherein the limit plate (36) is located on the moving path of the slide plate (33), and the end of the slide plate (33) has a concave surface (330), and the concave surface (330) is arranged opposite to the limit plate (36).

5. The coil spring pitch detection device according to claim 1, characterized in that: The slide plate (33) is provided with a first slide groove (331) and a second slide groove (332), the first slide groove (331) and the second slide groove (332) are arranged opposite to each other, the first clamping plate (31) has a first guide plate (312), the second clamping plate (32) has a second guide plate (322), the first guide plate (312) is clamped in the first slide groove (331), and the second guide plate (322) is clamped in the second slide groove (332).

6. The coil spring pitch detection device according to claim 1, characterized in that: The detection assembly (3) further comprises a limit plate (37), the limit plate (37) having a hollow (371) and a limit opening (372), the limit opening (372) being in communication with the hollow (371), the drive rod (22) being sleeved in the hollow (371), and the first clamping plate (31) and the second clamping plate (32) being clamped in the limit opening (372).

7. The coil spring pitch detection device according to claim 1, characterized in that: The positioning head (23) comprises a left column (231), a middle column (232) and a right column (233); the middle column (232) is arranged between the left column (231) and the right column (233); there is a gap between the left column (231) and the middle column (232); and there is a gap between the right column (233) and the middle column (232).

8. The coil spring pitch detection device according to claim 7, characterized in that: A pressing assembly (4) is provided on the chassis (1), and the pressing assembly (4) comprises a support plate (41), a cylinder (42) and a pressing rod (43), wherein the cylinder (42) is provided on the support plate (41), the pressing rod (43) is connected to a driving end of the cylinder (42), and the center column (232) is located on a moving path of the pressing rod (43).

9. The coil spring pitch detection device according to claim 8, characterized in that: A positioning groove (220) is provided on the center column (232), and the pressure rod (43) has two states: entering into and moving away from the positioning groove (220).

10. The coil spring pitch detection device according to claim 8, characterized in that: The pressing assembly (4) further comprises a pressing plate (44), wherein the pressing plate (44) is arranged on the pressing rod (43), and the pressing rod (43) passes through the pressing plate (44).

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