Measurement method using a spiral angle measuring device for an equal pitch rectangular holding spring

Abstract

To disclose a helix angle measuring device and method for a constant pitch rectangular pressing spring.SOLUTION: A helix angle measuring device for a constant pitch rectangular pressing spring comprises a medium diameter measuring mechanism 101, a coil number measuring mechanism 102, and a height measuring mechanism 103. The medium diameter measuring mechanism 101, coil number measuring mechanism 102, and height measuring mechanism 103 achieve detection of an outer diameter, an inner diameter, total number of coils, free length, and compression length of a detection target spring, provide data for calculation of the helix angle of the spring, and provide the basis for determining whether the magnitude of the helix angle of the spring matches requirements.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of automatic processing of engineering plastics, and particularly to a spiral angle measuring device and method for an equal pitch rectangular pressing spring.

Background Art

[0002] The spiral angle is an important parameter of the spring, and the size of the spiral angle affects the performance of the spring. If the spiral angle of the spring is too large, the spring stress increases with the increase of the spiral angle, the load eccentricity increases, the outer diameter and the lateral deformation of the spring become larger, and the fatigue source of the spring shifts from the inside to the outside of the spring coil, resulting in a shorter spring life. When the spiral angle is small, the elasticity of the spring is insufficient. Since the spring after processing cannot accurately detect whether its spiral angle is appropriate, it is impossible to accurately judge whether the spring processing parameters calculated artificially and input into the cutting device are correct. Therefore, it is necessary to design a detection device that can be used to detect the spiral angle of the spring and judge the quality of the spiral angle of the spring after processing.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In order to overcome the drawbacks of the prior art, the present invention proposes a spiral angle measuring device and method for an equal pitch rectangular pressing spring.

Means for Solving the Problems

[0004] To achieve the above object, the present invention adopts the following technical solutions. The present invention provides a spiral angle measuring device for an equal pitch rectangular pressing spring, comprising a rack, a middle diameter measuring mechanism, a coil number measuring mechanism, and a height measuring mechanism.

[0005] The center diameter measuring mechanism includes an optical curtain micrometer, a first linear slide table module, and a support claw group. The first linear slide table module is arranged on a rack and linearly drives the support claw group including two support claws arranged in an inverted eight shape with a gap therebetween. Both the emitting end and the receiving end of the optical curtain micrometer are fixed to the rack and are respectively located on both sides of the first linear slide table module. In the initial state, the support claw group is located at the end A1 (the end close to the optical curtain micrometer side) of the first linear slide table module, and the two support claws of the support claw group are symmetrically arranged with respect to the vertical optical curtain emitted from the emitting end.

[0006] The coil number measuring mechanism includes a laser scanning assembly, an inner support clamp, an electrically telescopic frame, and a horizontal movement mechanism. The laser scanning assembly includes a second linear slide table module, an annular frame, and a laser scanner. The second linear slide table module is arranged on the rack and drives the translational movement of the annular frame. Three laser scanners are fixed on the annular frame at equal intervals in the circumferential direction. The inner support clamp includes a fixed disk, a circular outer cover, support rods, and a driving member. The circular outer cover is removably fixed to the fixed disk. m first chutes are provided on the circular outer cover at equal intervals in the circumferential direction, where m≥2, and the direction of each first chute is along the radial direction of the circular outer cover. The support rods are provided with m pieces arranged horizontally and at equal intervals in the circumferential direction, and each support rod forms a slide pair with one first chute. The driving member inside the circular outer cover drives each support rod to move simultaneously along the corresponding first chute. The horizontal movement mechanism is provided on the rack and drives the electrically telescopic frame to translate, and the electrically telescopic frame drives the fixed disk to translate. Here, the direction in which the electrically telescopic frame drives the fixed disk to translate is parallel to the direction in which the second linear slide table module drives the annular frame to translate, and perpendicular to the direction in which the horizontal movement mechanism drives the electrically telescopic frame to translate. In the initial state, the electrically telescopic frame is located at the end B1 of the horizontal movement mechanism (the end close to the laser scanning assembly of the horizontal movement mechanism), the central axis of the fixed disk is provided collinearly with the central axis of the annular frame, the annular frame is located at the end C1 of the second linear slide table module (the end away from the horizontal movement mechanism), and each support rod does not penetrate the annular frame.

[0007] The height measurement mechanism described above includes a third linear slide table module, an annular platen, and a laser distance meter. The laser distance meter is fixed to the rack via a first fixing frame, the base of the third linear slide table module is fixed to the rack via a second fixing frame, and the slider of the third linear slide table module is detachably fixed to an L-shaped link integrally formed with the annular platen to which the pressure sensor is fixed. Here, the direction in which the third linear slide table module drives the annular platen to translate is parallel to the direction in which the electric telescopic frame drives the fixed disk to translate, and perpendicular to the direction in which the horizontal movement mechanism drives the electric telescopic frame to translate. When the electric telescopic frame is located at end B2 of the horizontal movement mechanism (the end far from the laser scanning assembly of the horizontal movement mechanism), the annular platen is located between the inner support clamp and the laser distance meter, and the central axis of the annular platen is provided collinearly with the central axis of the fixed disk.

[0008] Preferably, the emitting end and the receiving end are respectively fixed to two fixing seats, and both fixing seats are fixed to the rack.

[0009] Preferably, the driving member includes a disk inner cover, a screw rod, a gear, and a driving assembly. The disk inner cover is detachably attached to the fixed disk. The disk inner cover is provided with m second chutes arranged at equal intervals in the circumferential direction, and each second chute is aligned with one first chute. The gear forms a rotating pair with the fixed disk. The driving assembly includes m arranged along the circumferential direction of the gear, and the driving assembly includes a wedge block and a moving block. The wedge block and the fixed disk form a sliding pair in the tangential direction of the gear, and form a gear pair with the gear through the opened tooth groove. The convex strip integrally formed on the moving block forms a sliding pair with the inclined groove opened on the wedge block, and forms a sliding pair with a corresponding second chute. The wedge block of one driving assembly is connected to the screw rod through an opened screw hole, and the screw rod is driven by a driving motor. Each support rod is fixed to one moving block.

[0010] Preferably, the annular platen has multiple types of size specifications.

[0011] A measuring method for a spiral angle measuring device of an equal-pitch rectangular press spring, which is as follows. Step 1: Place the spring to be detected on two support claws. Next, open the emission end. The emission end emits a vertical light curtain, the receiving end receives the vertical light curtain, the spring to be detected shields a part of the light curtain, and the controller measures the outer diameter D1 and inner diameter D2 of the spring to be detected based on the shielded light curtain, calculates the middle diameter D of the spring to be detected, and the middle diameter D of the spring to be detected is given by the following formula 9.

Formula

Formula

Number

Number

Number

Number

Number

[0012] The beneficial effects of the present invention are as follows. 1. The support claw group of the middle diameter measurement mechanism of the present invention supports the detected spring, measures the outer diameter and inner diameter of the detected spring with an optical curtain micrometer, and further obtains the size of the middle diameter of the detected spring. In the inner support clamp of the coil number measurement mechanism of the present invention, each support rod supports the inner ring of the detected spring, the second linear slide table module drives the annular frame to scan the detected spring with each laser scanner, calculates the total number of coils of the detected spring from the number of mutation points obtained by the scanning, and further obtains the effective number of coils of the detected spring. In the present invention, the third linear slide table module drives the annular platen to compress the detected spring, measures the distances between the laser distance meter and the annular platen in the free state and the compressed state of the detected spring with a laser distance meter, and further obtains the free length and compressed length of the detected spring, thereby obtaining the size of the pitch of the detected spring. The present invention realizes the detection of parameters such as the outer diameter, inner diameter, total number of coils, free length, and compressed length of the detected spring, provides data for calculating the spiral angle of the spring, and further provides a basis for determining whether the size of the spiral angle of the spring after completion of processing meets the requirements. 2. In the present invention, two support claws spaced apart and shaped like an inverted eight support the spring to be detected, and the central axis of the spring to be detected is positioned in the middle of the two support claws of the support claw group, thereby realizing alignment between the central axis of the spring to be detected and the vertical light curtain transmitted from the emission end, thereby ensuring the accuracy of the measured outer diameter and inner diameter values ​​of the spring to be detected. 3. In the present invention, a plurality of laser scanners are provided at equal distances along the circumferential direction, and the laser scanners positioned at different angles scan the spring to be detected, thereby avoiding errors caused by interference between the end of the thread and the transition part of the support ring. 4. In the present invention, the driving members realize the synchronous expansion of each support rod, and further realize clamping of the detected spring, so that the detected spring is in a stable state. The subsequent laser scanner is advantageously used to scan the displacement points of the detected spring, and the annular platen is advantageously used to compress the detected spring. 5. The slider of the third linear slide module in the present invention can fix annular platens of different sizes, and can realize detection of different sizes of detected springs. [Brief description of the drawings]

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0014] The invention will now be further described with reference to the accompanying drawings. As shown in Fig. 1, the present invention provides a spiral angle measuring device for an equal pitch rectangular pressing spring, comprising a rack, a middle diameter measuring mechanism 101, a coil number measuring mechanism 102, and a height measuring mechanism 103.

[0015] As shown in Fig. 2, the middle diameter measuring mechanism 101 includes an optical curtain micrometer, a first linear slide table module 203, and a support claw group 204. The first linear slide table module 203 is arranged on the rack and drives the support claw group 204 including two support claws arranged in an inverted eight shape at intervals to translate. Both the emission end 201 and the reception end 202 of the optical curtain micrometer are fixed to the rack and are respectively located on both sides of the first linear slide table module 203. In the initial state, the support claw group 204 is located at the end A1 of the first linear slide table module 203, and the two support claws of the support claw group 204 are symmetrically arranged with respect to the vertical optical curtain emitted from the emission end 201.

[0016] As shown in FIG. 3, the coil number measuring mechanism 102 includes a laser scanning assembly 301, an inner support clamp 302, an electric telescopic frame 303, and a horizontal movement mechanism (a linear slide table module can be used). The laser scanning assembly 301 includes a second linear slide table module, an annular frame, and a laser scanner. The second linear slide table module is arranged on a rack and drives the translational movement of the annular frame. Three laser scanners are fixed to the annular frame at equal intervals in the circumferential direction. The inner support clamp 302 includes a fixed disk, a circular outer cover, support rods, and a driving member. The circular outer cover is removably fixed to the fixed disk. Three first chutes are provided on the circular outer cover at equal intervals in the circumferential direction, and the direction of each first chute is along the radial direction of the circular outer cover. The support rods include three that are arranged horizontally and at equal intervals in the circumferential direction, and each support rod forms a slide pair with one first chute. The driving member inside the circular outer cover drives each support rod to move simultaneously along the corresponding first chute. The circular outer cover is used to protect the driving member. The horizontal movement mechanism is provided on the rack and drives the electric telescopic frame 303 to translate, and the electric telescopic frame 303 drives the fixed disk to translate. Here, the direction in which the electric telescopic frame 303 drives the fixed disk to translate is parallel to the direction in which the second linear slide table module drives the annular frame to translate and perpendicular to the direction in which the horizontal movement mechanism drives the electric telescopic frame 303 to translate. In the initial state, the electric telescopic frame 303 is located at the end B1 of the horizontal movement mechanism, the central axis of the fixed disk is provided collinearly with the central axis of the annular frame, the annular frame is located at the end C1 of the second linear slide table module, and each support rod does not penetrate the annular frame.

[0017] As shown in FIG. 4, the height measurement mechanism 103 includes a third linear slide table module, an annular platen, and a laser distance meter 402. The laser distance meter 402 is fixed to the rack via a first fixing frame. The base of the third linear slide table module is fixed to the rack via a second fixing frame. The slider of the third linear slide table module is detachably fixed to an L-shaped link 401 integrally formed with the annular platen to which a pressure sensor is fixed. Here, the direction in which the third linear slide table module drives the annular platen to translate is parallel to the direction in which the electric telescopic frame 303 drives the fixed disk to translate, and is perpendicular to the direction in which the horizontal movement mechanism drives the electric telescopic frame 303 to translate. When the electric telescopic frame 303 is located at the end B2 of the horizontal movement mechanism, the annular platen is located between the inner support clamp and the laser distance meter, and the central axis of the annular platen is provided collinearly with the central axis of the fixed disk.

[0018] As a preferred embodiment, the emitting end 201 and the receiving end 202 are respectively fixed to two fixing seats, and both fixing seats are fixed to the rack.

[0019] As a preferred embodiment, as shown in FIGS. 3 and 5, the driving member includes a disk inner cover, a screw rod 501, a gear 504, and a driving assembly. The disk inner cover is detachably attached to the fixed disk. The disk inner cover is provided with m second chutes arranged at equal intervals in the circumferential direction, and each second chute is aligned with one first chute. The gear 504 forms a rotating pair with the fixed disk. The driving assembly includes three arranged along the circumferential direction of the gear 504, and the driving assembly includes a wedge block 502 and a moving block 503. The wedge block 502 and the fixed disk form a sliding pair in the tangential direction of the gear 504, and form a gear pair with the gear 504 through the provided tooth groove. The convex strip integrally formed on the moving block 503 forms a sliding pair with the inclined groove opened in the wedge block 502, and forms a sliding pair with one corresponding second chute. The wedge block 502 of one driving assembly is connected to the screw rod 501 through an opened screw hole, and the screw rod 501 is driven by a driving motor. Each support rod is fixed to one moving block 503.

[0020] As a preferred embodiment, the above annular platen has multiple types of size specifications. Select annular platens with different inner diameters so as to be able to correspond to the detection of detected springs with different inner diameters.

[0021] Here, the first linear slide table module 203, the electric telescopic frame 303, the second linear slide table module, the horizontal movement mechanism, the third linear slide table module, and the drive motor are all controlled by the controller, and the signal output ends of the receiving end 202, the laser scanner, the laser distance meter 402, and the pressure sensor are all connected to the controller 104.

[0022] The measuring method of the spiral angle measuring device for the equal pitch rectangular pressing spring of the present invention is as follows. Step 1: Place the detected spring on the two support claws, then open the emitting end 201. The emitting end 201 emits a vertical light curtain, the receiving end 202 receives the vertical light curtain, the detected spring shields a part of the light curtain, and the controller measures the outer diameter D1 and inner diameter D2 of the detected spring based on the shielded light curtain, calculates the middle diameter D of the detected spring, and the middle diameter D of the detected spring is as shown in the following formula (17).

Formula

Equation

Equation

Equation

Equation

Equation

Equation

Equation

Claims

1. A method for measuring the helix angle of a uniform pitch rectangular pressure spring using a helix angle measuring device, comprising the steps of: The helical angle measuring device for the equal-pitch rectangular pressure spring is The device includes a rack, a diameter measuring mechanism, a coil number measuring mechanism, and a height measuring mechanism, The middle diameter measurement mechanism includes a light curtain micrometer, a first linear slide module, and a support claw group. The first linear slide module is arranged on the rack and drives a support claw group, which includes two support claws arranged at a distance and having an inverted eight shape, in translation. The light curtain micrometer has an emission end and a receiving end both fixed to the rack and located on both sides of the first linear slide module, respectively. In an initial state, the support claw group is located at an end of the first linear slide module close to the light curtain micrometer side, and the two support claws of the support claw group face the vertical light curtain emitted from the emission end. They are placed in the same place, The coil number measurement mechanism includes a laser scanning assembly, an inner support clamp, a motorized telescopic frame, and a horizontal movement mechanism. The laser scanning assembly includes a second linear slide base module, an annular frame, and a laser scanner. The second linear slide base module is disposed on the rack and drives the translational movement of the annular frame. Three of the laser scanners are fixed to the annular frame at equal intervals in the circumferential direction. The inner support clamp includes a fixed disk, a circular outer cover, a support rod, and a drive member. The circular outer cover is removably fixed to the fixed disk. The circular outer cover is provided with m first chutes at equal intervals in the circumferential direction, m≧2. The orientation of each of the first chutes is along the radial direction of the circular outer cover. The support rods include m support rods that are horizontally and equally spaced in the circumferential direction. Each of the support rods forms a slide pair together with one of the first chutes. the driving member in the circular outer cover drives each of the support rods to move along the corresponding first chute at the same time; the horizontal movement mechanism is mounted on the rack and drives the electric telescopic frame to translate, and the electric telescopic frame drives the fixed disk to translate, wherein the direction in which the electric telescopic frame drives the fixed disk to translate is parallel to the direction in which the second linear slide base module drives the annular frame to translate and perpendicular to the direction in which the horizontal movement mechanism drives the electric telescopic frame to translate; in an initial state, the electric telescopic frame is located at an end of the horizontal movement mechanism close to the laser scanning assembly, the central axis of the fixed disk is aligned with the central axis of the annular frame, and the annular frame is located at an end of the second linear slide base module away from the horizontal movement mechanism, and each of the support rods does not pass through the annular frame; the height measurement mechanism comprises a third linear slide base module, an annular platen, and a laser range finder, the laser range finder being fixed to the rack via a first fixing frame, a base of the third linear slide base module being fixed to the rack via a second fixing frame, and a slider of the third linear slide base module being detachably fixed to an L-shaped link integrally formed with the annular platen to which a pressure sensor is fixed, wherein a direction in which the third linear slide base module drives the annular platen to translate is parallel to a direction in which the motorized telescopic frame drives the fixed disk to translate and is perpendicular to a direction in which the horizontal movement mechanism drives the motorized telescopic frame to translate, and when the motorized telescopic frame is located at an end of the horizontal movement mechanism away from the laser scanning assembly, the annular platen is located between the inner support clamp and the laser range finder, and a central axis of the annular platen is collinear with a central axis of the fixed disk; Step 1: placing a detected spring on two support claws, then opening the emitting end, the emitting end emitting a vertical light curtain, the receiving end receiving the vertical light curtain, the detected spring blocking a part of the light curtain, the controller measuring an outer diameter D 1 and an inner diameter D 2 of the detected spring according to the blocked light curtain, and calculating an inner diameter D of the detected spring, the inner diameter D of the detected spring being the following equation 1; Step 2: close the exit end, and the controller controls the first linear slide module to drive a group of support claws to move the detected spring to the end opposite to the end of the first linear slide module; then the controller controls the electric telescopic frame to translate the fixed disk in a direction away from the horizontal movement mechanism until the fixed disk makes the three support rods pass through the annular frame and through the inner ring of the detected spring; then the driving member drives the three support rods to synchronously extend outward along the corresponding first chute, and the controller controls the electric telescopic frame to drive the fixed disk to return to its initial position until the three support rods contact the inner ring of the detected spring; The controller controls the second linear slide module to drive the annular frame to translate in a direction closer to the fixed disk, and at the same time, the laser scanners start scanning, the detection springs and the support rods all pass through the annular frame, the annular frame passes over the detection springs, and moves to the end of the second linear slide module closer to the horizontal movement mechanism, and the laser scanners transfer the numbers of mutation points λ 1 , λ 2 , λ 3 obtained by scanning respectively to the controller, and the controller calculates the total coil number N 1 and the effective coil number N of the detection springs, where the total coil number N 1 of the detection springs is given by the following equation 2: The number of effective coils N of the spring to be detected is expressed by the following equation 3: Step 3: Λ in the following formula 2 is the following formula 4. The controller controls the second linear slide base module to drive the annular frame to return to its original position, the horizontal movement mechanism drives the motorized telescopic frame to move the detection spring to an end of the horizontal movement mechanism away from the laser scanning assembly, and then fixes an annular fixing plate having an inner diameter smaller than the outer diameter of the detection spring and larger than the inner diameter of the detection spring to the slider of the third linear slide base module, the controller controls the third linear slide base module to drive the annular platen to move in a direction approaching the horizontal movement mechanism, the support rods penetrate the annular platen, the annular platen contacts the detection spring, and the detection spring is pushed to contact the circular outer cover, the annular platen starts to compress the detection spring until the detection spring is fully compressed, and the laser range finder measures a distance X between the laser range finder and the annular platen at this time. and transmits the data to the controller, and the controller controls the third linear slide base module to drive the annular platen to move in a direction away from the second linear slide base module, and when the pressure value detected by the pressure sensor is smaller than a preset threshold, the laser range finder measures a distance X2 between the laser range finder and the annular platen at this time and transmits the data to the controller, and the controller calculates the free length L0 of the detected spring, the length L1 after full compression, the pitch t, ​​and the helical angle of the spring, and the free length L0 of the detected spring is given by the following equation 5: The length L 1 after full compression is given by the following equation (6): The pitch t of the spring to be detected is expressed by the following formula 7: Step 4, in which the helical angle α of the spring to be detected is expressed by the following formula 8; and (5) the controller controls the third linear slide module to drive the annular platen to return to its original position, then the driving member drives each of the support rods to move inward synchronously along the corresponding first chute to its original position, and then removes the spring that has completed detection, the horizontal movement mechanism drives the electric telescopic frame to move to its original position, and the first linear slide module drives the support claw group to move to its original position. [0010] [0025] [0030] [0045] [0050] where S is the distance between the laser range finder and the circular outer cover, and d is the thickness of the annular platen. [006] [0070] [0080]

2. 2. The method for measuring the helical angle of a uniform-pitch rectangular pressure spring using the helical angle measuring device according to claim 1, wherein the emitting end and the receiving end are fixed to two fixing seats, respectively, and both of the two fixing seats are fixed to the rack.

3. The driving member includes a disk inner cover, a screw rod, a gear, and a driving assembly, the disk inner cover is removably attached to the fixed disk, the disk inner cover is provided with m number of second chutes arranged at equal intervals in the circumferential direction, each of the second chutes is aligned with one of the first chutes, the gear forms a rotating pair with the fixed disk, the driving assembly includes m pieces arranged along the gear circumferential direction, the driving assembly includes a wedge block and a moving block, and the wedge block and the fixed disk slide in the gear tangential direction.

2. The method for measuring a helix angle of a uniform-pitch rectangular pressure spring using the helix angle measuring device according to claim 1, wherein the movable block forms a sliding pair with the gear and forms a gear pair with the gear through an opened tooth groove, a convex strip integrally formed on the movable block forms a sliding pair with an oblique groove opened on the wedge block and forms a sliding pair with a corresponding one of the second chutes, the wedge block of one of the drive assemblies is connected to the threaded rod through an opened screw hole, the threaded rod is driven by a drive motor, and each of the support rods is fixed to one of the movable blocks.

4. 2. The method for measuring a helix angle of a uniform-pitch rectangular pressure spring using the helix angle measuring device according to claim 1, wherein the annular platen has a plurality of different size specifications.

Images