A universal angle detection gauge and method for center arm torsion spring

Abstract

The present application relates to torsion spring angle detection measuring tool technical field, especially to a kind of center arm torsion spring universal angle detection measuring tool and method, device includes outer main body, slider assembly, sliding ruler, inner main body assembly, centering assembly etc., the measuring tool of the present application simple structure, compact, lower in processing and manufacturing cost, measurement uses operation is easy, measurement result is accurate, with good torsion spring structure universality and applicability;Can satisfy the measurement function of the replacement of current special angle sample block, and has the actual measurement function of arbitrary angle value;Reduce the processing and manufacturing quantity of torsion spring angle block, reduce the measuring tool use cost, also reduce the period of making special measuring tool;Satisfy the technical demand of current about short production cycle, low cost, high quality.

Description

Technical Field

[0001] The present invention relates to the technical field of torsion spring angle detection measuring tools, and in particular to a universal angle detection measuring tool and method for a center arm torsion spring. Background Art

[0002] The structure of the center arm torsion spring is as follows Figure 1-2 As shown, after production, the torsion spring angle needs to be inspected. Products with angle deviations within a certain range are considered acceptable. Testing methods include direct projection testing or using specialized measuring tools. Direct projection testing, however, involves spatial angular dimensions, making positioning difficult, complex, and inefficient, making it unsuitable for large-scale product testing. In actual factory production, testing is performed using regularly calibrated upper and lower angle test blocks (Chinese invention patent publication number CN218787797U). However, measuring tools with upper and lower angle test blocks have a unique range of test angles and cannot determine the specific value of the torsion spring angle, effectively determining acceptance. Furthermore, these specialized torsion spring angle test blocks typically have a limited applicability to the outer diameter of the torsion spring, which serves as a positioning tool during testing, resulting in limited versatility. They also have limitations on the working coil length of the torsion spring. Therefore, the torsion spring angle test blocks used in factories are highly specialized and lack versatility.

[0003] Due to the existence of the above problems, in order to meet the production, manufacturing and testing needs of various torsion spring structures in the factory, multiple models of special torsion spring angle testing samples are needed, which has high manufacturing and management costs.

[0004] Chinese invention patent publication number CN218787797U, "A rapid angle detection gauge for torsion springs," discloses a unique detection device with fixed upper and lower angle limits, a fixed height, and a fixed outer diameter of the torsion spring's working coil. This gauge can only detect torsion springs of specific structural dimensions and is not universally applicable. Chinese invention patent publication number CN208567750U, "A torsion spring angle detection device," discloses a structure with left and right limit blocks for detecting the angles of left-handed and right-handed torsion springs, respectively. This gauge also fails to quickly detect whether the angles meet the upper and lower limits. Chinese invention patent publication number CN220250895U, "An auxiliary tool for simple and convenient testing of torsion spring angles," discloses a device that uses a mechanical structure to secure the torsion spring and then uses a handheld test ruler to test the included angle of the force arm. This device is only suitable for tangent-arm torsion springs and requires a high level of manual labor during the testing process. Therefore, it is necessary to develop a universal angle detection gauge for center-arm torsion springs. Summary of the Invention

[0005] The purpose of the present application is to provide a universal angle detection gauge and method for center arm torsion spring, to solve the singleness of the current torsion spring angle detection gauge or method, to realize a set of gauge that can realize torsion spring angle upper limit, angle lower limit detection, and torsion spring angle numerical value detection, to be suitable for different torsion spring outer diameter (inner diameter) size, different torsion spring wire diameter, different torsion spring force arm length, and different torsion spring working circle length part detection, to make the torsion spring angle detection gauge have universality, wider applicability, and better use convenience, and to reduce the manufacturing and management cost of the torsion spring special angle detection gauge.

[0006] Technical scheme:

[0007] A universal angle detection gauge for center arm torsion spring, comprising an outer main body, which is a cylindrical body structure, one end of which is provided with a scale boss, an upper sliding block assembly and a lower sliding block assembly are slidingly arranged on the scale boss, and an outer cylindrical surface is provided with a lateral oval ring groove a, a lateral oval ring groove b, a lateral oval ring groove c and a lateral oval ring groove d; an inner main body is arranged in a hole of the outer main body and is in sliding cooperation with the outer main body, an outer cylindrical surface of the inner main body is provided with two opposite movement pressure rods, the movement pressure rods are in sliding cooperation with the lateral oval ring groove a and the lateral oval ring groove c opposite to the outer main body, a locking nut is arranged on the outer cylindrical surface of the inner main body and is in sliding cooperation with the lateral oval ring groove b; a centering assembly comprises a left centering block, a right centering block, a centering pressure rod, a displacement block, a second reset spring and a displacement baffle, the displacement block is slidingly arranged in a displacement slide of the inner main body, one end of the displacement block is connected with the centering pressure rod, the centering pressure rod penetrates out of the outer main body and is in sliding cooperation with the lateral oval ring groove d, the other end of the displacement block is in contact with the second reset spring, the second reset spring is limited by a second positioning baffle arranged at one end of the displacement slide, the left centering block and the right centering block are the same in structure and each comprises a large square structure, small square structures arranged on both sides of the large square structure and a cylinder, the large square structures of the left centering block and the right centering block are symmetrically arranged on a centering slide of the inner main body, the cylinders of the left centering block and the right centering block are in sliding cooperation with a V-shaped slide of the displacement block, the small square structures protrude from an upper end surface of the inner main body, the centering pressure rod is pressed to drive the displacement block to slide in the displacement slide, the cylinders of the left centering block and the right centering block are moved towards each other in the V-shaped slide, the centering pressure rod is released, the second reset spring drives the displacement block to slide in the displacement slide, the cylinders of the left centering block and the right centering block are moved away from each other in the V-shaped slide, and clamping is realized; a center positioning shaft is fixed in a circular hole at the center of the upper end surface of the inner main body and is coaxial with a central axis of the outer main body, and a first reset spring is fixed in an inner hole of a lower end of the inner main body.

[0008] Further, planes where the lateral oval ring groove a and the lateral oval ring groove c are located are parallel to planes where the lateral oval ring groove b and the lateral oval ring groove d are located.

[0009] Further, the end cover is installed at the lower end of the outer body, and a hexagonal hole is arranged at the bottom of the end cover for disassembly.

[0010] Further, the upper end of the first return spring is in contact with the inner body, and the lower end is in contact with the spring fixing hole in the center of the end cover.

[0011] Further,

[0012] The upper slider assembly and the lower slider assembly are symmetrical in structure, wherein the upper slider assembly comprises an upper slider, a slide ruler, a butterfly screw, and a first positioning baffle, the first positioning baffle is fixed at the bottom of the upper slider by a screw, the first positioning baffle and the upper slider form a sliding groove that is in sliding cooperation with the scale boss on the outer body, an oval boss is arranged at the top end face of the upper slider, the oval boss is in cooperation with the oval slot on the slide ruler, a threaded hole is arranged at the center of the oval boss, and the threaded hole is in threaded cooperation with the compression screw to fix the slide ruler in the axial direction.

[0013] Further,

[0014] The lower slider assembly comprises an upper slider, a slide ruler, a butterfly screw, and a first positioning baffle, the first positioning baffle is fixed at the bottom of the lower slider by a screw, the first positioning baffle and the lower slider form a sliding groove that is in sliding cooperation with the scale boss on the outer body, an oval boss is arranged at the top end face of the lower slider, the oval boss is in cooperation with the oval slot on the slide ruler, a threaded hole is arranged at the center of the oval boss, and the threaded hole is in threaded cooperation with the compression screw to fix the slide ruler in the axial direction.

[0015] A center arm torsion spring angle detection method uses the detection gauge to measure, including a torsion spring angle numerical quantitative detection method and a torsion spring angle qualification qualitative detection method;

[0016] The torsion spring angle numerical quantitative detection method is:

[0017] First, for different working circle inner diameters of the torsion spring, a suitable center positioning shaft diameter is selected, the center positioning shaft is inserted into the center positioning hole on the inner body, the suitability for different working circle inner diameters is realized, the inner diameter hole of the measured torsion spring and the center positioning shaft are used for fixed positioning, and the torsion spring working circle axis is coincided with the center positioning shaft.

[0018] Secondly, by tightening the centering pressure rod in the centering assembly, the displacement block is pushed to move in the displacement slide toward the side of the limit baffle, driving the left and right centering blocks installed on the displacement block to move toward each other, opening the centering clamping position formed by the left and right centering blocks, and placing the lower force arm of the torsion spring to be measured in the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block, under the action of the second return spring force, pushes the displacement block to move in the displacement slide toward the side of the centering pressure rod, driving the left and right centering blocks installed on the displacement block to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks, clamping the lower force arm of the torsion spring to be measured in the centering clamping position, and realizing the alignment of the lower force arm of the torsion spring to the scale 0;

[0019] Next, press down the moving rods on both sides to adjust the upper and lower height positions of the force arm on the torsion spring so that it is close to the height of the scale boss to facilitate accurate reading of the angle value; when the height is adjusted appropriately, tighten the locking nut to fix the position of the inner body to lock the measured height;

[0020] Finally, read the scale value on the circular scale boss pointed by the upper force arm of the torsion spring, which is the degree of the torsion spring being measured;

[0021] When the measurement is completed, press the centering lever, open the centering clamping position, and take out the torsion spring;

[0022] Qualitative test method for the conformity of torsion spring angle:

[0023] First, according to the different inner diameters of the torsion spring's working circle, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve applicability to different inner diameters of the working circle, and use the inner diameter hole of the torsion spring being tested and the center positioning shaft to fix and position them so that the axis of the torsion spring's working circle coincides with the center positioning shaft;

[0024] Secondly, by pressing the centering pressure rod in the centering assembly, the displacement block is pushed to move in the displacement slide toward the side of the second positioning baffle, driving the left and right centering blocks installed on the displacement block to move toward each other, opening the centering clamping position formed by the left and right centering blocks, and placing the lower force arm of the torsion spring to be measured in the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block, under the action of the second return spring force, pushes the displacement block to move in the displacement slide toward the side of the centering pressure rod, driving the left and right centering blocks installed on the displacement block to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks, clamping the lower force arm of the torsion spring to be measured on the centering clamping position, and realizing that the lower force arm of the torsion spring is aligned with the scale 0;

[0025] Again, set the position of the upper slider assembly and the lower slider assembly on the scale boss: that is, loosen the butterfly nut, rotate the upper slider assembly to the upper limit angle value of the measured torsion spring angle, lock the butterfly nut, rotate the lower slider assembly to the lower limit angle value of the measured torsion spring angle, and lock the butterfly nut, complete the setting of the upper and lower limits of the measured torsion spring angle;

[0026] Fourthly, press down the two side movement pressure rods to adjust the height position of the upper side arm of the torsion spring, so that it is close to the height of the slide ruler plane, thereby facilitating the judgment of whether the torsion spring angle is within the upper and lower limit range of the measured torsion spring angle; after the height is adjusted appropriately, screw the locking nut to fix the position of the inner main body, and realize the locking of the measured height;

[0027] Finally, judge whether the upper side arm of the torsion spring is within the angle range between the two slider assemblies. If the upper side arm of the torsion spring is within the angle range between the two slider assemblies, it is considered qualified.

[0028] When the measurement is completed, press the centering pressure rod to open the centering clamping position, and then the torsion spring can be taken out.

[0029] Further, when repeatedly measuring other torsion spring angle values, only the torsion spring needs to be replaced, the centering pressure rod is pressed to open the centering clamping position, the torsion spring is worn on the center positioning shaft, the lower side arm is placed at the centering clamping position, the force applied to the centering pressure rod is loosened, the centering clamping is realized, and the circumferential scale degree value pointed to by the upper side arm of the torsion spring is read, thereby realizing repeated measurement.

[0030] Further, when repeatedly measuring the eligibility of other torsion spring angles, only the torsion spring needs to be replaced, the centering pressure rod is pressed to open the centering clamping position, the torsion spring is worn on the center positioning shaft, the lower side arm is placed at the centering clamping position, the force applied to the centering pressure rod is loosened, the centering clamping is realized, and whether the upper side arm of the torsion spring is within the angle range between the two slider assemblies is judged, thereby realizing repeated measurement.

[0031] Beneficial effects:

[0032] The present application provides a kind of center arm torsion spring universal angle detection gauge and method, the gauge structure of the present application is simple, compact, and the manufacturing cost is lower, measurement is easy to operate, measurement result is accurate, with good torsion spring structure universality and applicability;It can meet the measurement function of replacing the current special angle sample block, and has the actual measurement function of arbitrary angle value;It reduces the number of torsion spring angle blocks in processing and manufacturing, reduces the use cost of gauge, also reduces the period of manufacturing special gauge;It meets the current technical requirements of short production cycle, low cost and high quality. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] Figure 1 is a schematic diagram of the center arm torsion spring structure introduced in the background of the present application;

[0035] Figure 2 is a side view of the center arm torsion spring structure introduced in the background of the present application;

[0036] Figure 3 is a schematic diagram of the outer profile structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0037] Figure 4 is a schematic diagram of the combined assembly structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0038] Figure 5 is a top view of the combined assembly structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0039] Figure 6 is Figure 5 a sectional view along the direction of A-A;

[0040] Figure 7 is a schematic diagram of the outer body of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0041] Figure 8 is a schematic diagram of the inner body part structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application Figure 1 ;

[0042] Figure 9 is a schematic diagram of the inner body part structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application Figure 2 ;

[0043] Figure 10 is a top view of the inner body part structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0044] Figure 11 is Figure 10 a sectional view along the direction of B-B;

[0045] Figure 12 is a schematic diagram of the left-right centering block part structure of an embodiment of the center arm torsion spring angle detection gauge provided by the present application;

[0046] Figure 13 is a lower sliding block part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application;

[0047] Figure 14 is an upper sliding block part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application;

[0048] Figure 15 is a positioning baffle part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application;

[0049] Figure 16 is a sliding ruler part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application;

[0050] Figure 17 is a displacement block part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application Figure 1 ;

[0051] Figure 18 is a displacement block part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application Figure 2 ;

[0052] Figure 19 is a displacement block part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application Figure 3 ;

[0053] Figure 20 is a centering pressure rod part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application;

[0054] Figure 21 is a center positioning shaft part structure schematic diagram of a center arm torsion spring angle detection gauge embodiment provided by the present application.

[0055] In the drawings: 01-outer main body, 02-inner main body, 03-left centering block, 04-right centering block, 05-lower sliding block, 06-sliding ruler, 07-first positioning baffle, 08-tightening screw, 09-upper sliding block, 10-butterfly screw, 11-movement pressure rod, 12-centering pressure rod, 14-end cover, 15-first return spring, 16-locking nut, 17-second return spring, 18-displacement block, 19-second positioning baffle, 20-center positioning shaft. DETAILED DESCRIPTION

[0056] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0057] Features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments below is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific settings and methods presented below, but covers any improvements, replacements and modifications of structures, methods and devices without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary obscuring of the present application.

[0058] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be referred to and cited by each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0059] Referring to the drawings and in combination with the embodiments, Figure 3-21 the first embodiment of the present application is:

[0060] A universal angle detection gauge for a center arm torsion spring is proposed, which comprises an outer main body 01, the outer main body 01 is a cylindrical structure, one end of which is provided with a scale boss, which has a display or indication measurement function of any angle from 0° to 360°, an upper slider assembly and a lower slider assembly are slidingly arranged on the scale boss, the upper and lower slider assemblies have the function of freely rotating along the scale disc of the outer main body 01, the rotation process can be fixed by using a butterfly screw, so as to achieve the requirement of setting the upper limit and lower limit angle values of the measured torsion spring angle.

[0061] The outer body 01 is provided with a lateral oval ring groove a, a lateral oval ring groove b, a lateral oval ring groove c and a lateral oval ring groove d on the outer cylindrical surface; the inner body 02 is arranged in the hole of the outer body 01 and is in sliding fit with the outer body 01, the outer cylindrical surface of the inner body 02 is provided with two opposite movement pressure rods 11, the movement pressure rods 11 are in sliding fit with the lateral oval ring groove a and the lateral oval ring groove c of the outer body 01, the outer cylindrical surface of the inner body 02 is provided with a locking nut 16, and the locking nut 16 is in sliding fit with the lateral oval ring groove b; the inner body 02 has an up-down movement function and a function of being locked and fixed at an arbitrary position in the up-down movement space.

[0062] The up-down movement of the inner body 01 is suitable for torsional springs with different working circle lengths, so that the measured torsional arm of the measured torsional spring is close to the scale disc or sliding ruler of the gauge, and the accuracy of the gauge degree reading is improved. The movement function of the inner body 01 is realized by pressing the movement pressure rod 11 downward, the inner body 02 is moved upward under the action of the first return spring 15, and the position locking of the inner body 02 in the movement process is realized by screwing the locking screw 16 to fix the position. The inner body 02 has a function of preventing circumferential rotation, which is realized by limiting the circumferential movement of the movement pressure rod 11 fixed on the inner body 02, so that the movement pressure rod 11 can only move up and down along the lateral oval ring groove of the outer body 01, and the shaft diameter of the movement pressure rod 11 is in small gap fit with the width of the oval ring groove, so as to fix the circumferential relative position of the inner body 02 relative to the scale disc of the outer body 01. The inner body 02 is provided with a center positioning hole in which a center positioning shaft 20 with a diameter suitable for the inner diameter of the working circle of the torsional spring can be inserted, so as to realize the fixation and positioning of the inner diameter hole of the measured torsional spring.

[0063] The inner body 02 is provided with a centering assembly, the centering assembly moves up and down together with the inner body 02; the centering assembly mainly realizes clamping and fixing of one end of the force arm of the measured torsional spring, is suitable for torsional springs with different wire diameters, and makes the clamped force arm of the torsional spring always point to the zero scale position of the scale disc of the outer body 01.

[0064] The centering assembly comprises a left centering block 03, a right centering block 04, a centering pressure rod 12, a displacement block 18, a second reset spring 17, and a second displacement baffle 19. The displacement block 18 is slidingly arranged in a displacement slide of the inner body 02, and one end of the displacement block 18 is connected with the centering pressure rod 12. The centering pressure rod 12 penetrates through the outer body 01 and slidingly cooperates with a lateral oval ring groove d. The other end of the displacement block 18 is in contact with the second reset spring 17. The second reset spring 17 is limited by the displacement baffle 18 arranged at one end of the displacement slide. The left centering block 03 and the right centering block 04 are structurally identical, and each comprises a large square structure, small square structures arranged at two sides of the large square structure, and a cylinder. The large square structures of the left centering block 03 and the right centering block 04 are symmetrically arranged on the centering slide of the inner body 02. The cylinder of the left centering block 03 and the right centering block 04 slidingly cooperates with the V-shaped slide of the displacement block. The small square structures protrude from the upper end surface of the inner body 02. By pressing the centering pressure rod 12, the displacement block 18 is pushed to slide in the displacement slide, and the cylinder of the left centering block 03 and the right centering block 04 are driven to move towards each other in the V-shaped slide. When the centering pressure rod 12 is released, the second reset spring 17 pushes the displacement block 18 to slide in the displacement slide, and the cylinder of the left centering block 03 and the right centering block 04 are driven to move away from each other in the V-shaped slide, thereby achieving clamping. The center positioning shaft 20 is fixed in a circular hole at the center of the upper end surface of the inner body 02, and is coaxial with the central axis of the outer body 01. The first reset spring 15 is fixed in the inner hole of the lower end of the inner body.

[0065] When clamping the torsion spring, the centering pressure rod 12 in the centering assembly is pressed, the displacement block 18 is driven to move inward, and the two centering blocks arranged on the displacement block 18 are driven to move towards each other, thereby opening the clamping centering position. When the external force applied to the centering pressure rod 12 is removed, the displacement block 18 can drive the two centering blocks to automatically clamp the force arm of the measured part under the action of the second reset spring 17.

[0066] The inner body 02 has a displacement block slide and a centering slide in a vertical position relationship. The existence of the above slides provides a structural position for the installation of the centering assembly, and also achieves the movement direction conversion of the displacement block 18 and the centering block with the vertical movement direction characteristic.

[0067] The displacement block 18 has a V-shaped slide for installing the cylindrical structure of the centering block. Two centering blocks are symmetrically arranged in the V-shaped slide. When the displacement block moves, the two centering blocks are driven to move in the centering slide of the inner body 02 through the V-shaped slide, thereby achieving the movement direction conversion of the displacement block 18 and the centering block, and also achieving the opposite movement or relative movement of the two centering blocks.

[0068] The second displacement baffle 19 in the centering assembly is fixed with the inner body 02 by a fixing screw, thereby forming a barrier for the second reset spring 17 in the centering assembly. When the external force applied to the centering pressure rod 12 is removed, the second reset spring 17 drives the displacement block 18 to move, thereby preventing the reset function from failing.

[0069] The threaded structure at one end of the centering pressure rod 12 in the centering assembly is connected with the threaded hole on the displacement block 18, and the centering pressure rod 12 extends out of the outer main body 01 through the oval slot on the outer main body 01; when the centering assembly is used to clamp the torsion spring force arm, the operation is convenient.

[0070] The measuring tool of the present application has a measuring angle setting or indicating device, which can provide a measuring tool for measuring the actual angle of a centering arm torsion spring, and can also realize rapid measurement of whether a part meets the upper and lower limits of the required angle range, has wide applicability of measurement methods and measurement angle ranges, and is suitable for torsion spring parts with different wire diameters, work circle length parts, work inner diameter (outer diameter) size parts, force arm length size parts, and rotation direction torsion spring parts, and has wide applicability to torsion spring structural characteristics.

[0071] In the embodiment, the planes where the lateral oval type ring grooves a and c are located are parallel to the planes where the lateral oval type ring grooves b and d are located.

[0072] In the embodiment, the measuring tool of the present application further includes an end cover 14, which is installed at the lower end of the outer main body 01, and the bottom of the end cover 14 is provided with an inner hexagonal hole for disassembly.

[0073] In the embodiment, the upper end of the first reset spring 15 is in contact with the inner main body 02, and the lower end is in contact with the spring fixing hole in the center of the end cover 14.

[0074] In the embodiment, the upper and lower slider block assemblies are symmetrical in structure, wherein the upper slider block assembly includes an upper slider block 09, a slide ruler 06, a butterfly screw 10, and a first positioning baffle 7, the first positioning baffle 7 is fixed at the bottom of the upper slider block through the butterfly screw 10, the first positioning baffle 7 and the upper slider block 09 form a sliding groove that is in sliding cooperation with the scale boss on the outer main body 01, the top end surface of the upper slider block 09 is provided with an oval boss, the oval boss is in cooperation with the oval slot on the slide ruler 06, and the center of the oval boss is provided with a threaded hole that is in threaded cooperation with the compression screw 08 to fix the slide ruler 06 in the axial direction.

[0075] In the embodiment, the lower slider assembly includes the upper slider 05, the slide ruler 06, the butterfly screw 10 and the first positioning baffle 07, the first positioning baffle 07 is fixed at the bottom of the lower slider 05 through the butterfly screw 10, the first positioning baffle 07 and the lower slider 05 form a sliding groove which is in sliding cooperation with the scale boss on the outer main body 01, the top end surface of the lower slider 05 is provided with an oval boss, the oval boss is matched with the oval slot on the slide ruler 06, the center of the oval boss is provided with a threaded hole which is in threaded cooperation with the compression screw 06 to fix the slide ruler 06 in the axial direction. The slider assembly includes the upper slider assembly and the lower slider assembly, the slider assembly is radially limited by the circular arc ring groove on the upper slider 09 and the lower slider 05 and the scale dial boss of the outer main body 01; the slider assembly is axially limited on the scale dial boss of the outer main body 01 by the first positioning baffle 07 and the butterfly screw 10; the above-mentioned limiting structure functions make the slider assembly only rotate along the scale dial of the outer main body 01.

[0076] The slider assembly also includes the slide ruler 06 which can adjust the radial position, the slide ruler 06 is provided with an oval position fixing slot which can adjust the fixed position, the position fixing slot is in cooperation with the position fixing pin on the upper slider 09 or the lower slider 05, and the position of the slide ruler 06 is locked by the compression screw 08; the structural feature makes the gauge suitable for different force arm lengths of the torsion spring.

[0077] The embodiment also provides a center arm torsion spring angle detection method, which uses the detection gauge to measure, including a torsion spring angle numerical quantitative detection method and a torsion spring angle qualification qualitative detection method.

[0078] The torsion spring angle numerical quantitative detection method is as follows:

[0079] Firstly, for different working circle inner diameters of the torsion spring, the suitable center positioning shaft 20 is selected according to the diameter, the center positioning shaft 20 is inserted into the center positioning hole on the inner main body 02 to realize the applicability to different working circle inner diameters, the inner diameter hole of the measured torsion spring and the center positioning shaft 20 are used for fixed positioning, so that the torsion spring working circle axis is coincided with the center positioning shaft 20.

[0080] Secondly, by pressing the centering pressure rod 12 in the centering assembly, the displacement block 18 moves to the side of the second limiting baffle 19 in the displacement slide, driving the left and right centering blocks 04 on the displacement block 18 to move towards each other, opening the centering clamping position formed by the left and right centering blocks 04, placing the lower arm of the measured torsion spring on the centering clamping position, removing the external force applied to the centering pressure rod 12, the displacement block 18 moves to the side of the centering pressure rod 12 in the displacement slide under the action of the second return spring 17, driving the left and right centering blocks 04 on the displacement block 18 to move relatively, reducing the centering clamping position formed by the left and right centering blocks 04, clamping the lower arm of the measured torsion spring on the centering clamping position, and realizing the alignment of the lower arm of the torsion spring with the 0 position;

[0081] Thirdly, press down the two side movement pressure rods 11 to adjust the height position of the upper arm of the torsion spring, so that it approaches the height of the scale boss, facilitating accurate reading of the angle value; after the height is adjusted appropriately, screw the locking nut 16 to fix the position of the inner body 02, realizing the locking of the measured height;

[0082] Finally, read the scale value on the circumferential scale boss pointed by the upper arm of the torsion spring, which is the measured torsion spring value;

[0083] When the measurement is completed, press the centering pressure rod 12 to open the centering clamping position, and take out the torsion spring;

[0084] When measuring the angle value of other torsion springs repeatedly, only need to replace the torsion spring, press the centering pressure rod 12 to open the centering clamping position, put the torsion spring on the center positioning shaft 20, and place the lower arm on the centering clamping position, release the force applied to the centering pressure rod 12, realize the centering clamping, and read the scale value on the circumferential scale boss pointed by the upper arm of the torsion spring, which is the repeated measurement.

[0085] Torsion spring angle qualification qualitative detection method:

[0086] Firstly, according to the different working circle inner diameter size of the torsion spring, select the appropriate center positioning shaft 20 diameter, insert the center positioning shaft 20 into the center positioning hole on the inner body 02, realize the applicability of different working circle inner diameter size, use the inner diameter hole of the measured torsion spring and the center positioning shaft 20 for fixed positioning, make the torsion spring working circle axis coincide with the center positioning shaft 20;

[0087] Secondly, by pressing the centering pressure rod 12 in the centering assembly, the displacement block 18 is pushed to move in the displacement slide to one side of the second limiting baffle 19, driving the left and right centering blocks 04 on the displacement block 18 to move towards each other, opening the centering clamping position formed by the left and right centering blocks 04, placing the lower side arm of the measured torsion spring on the centering clamping position, removing the external force applied to the centering pressure rod 12, the displacement block 18 is pushed to move in the displacement slide to one side of the centering pressure rod 12 under the action of the second return spring 17, driving the left and right centering blocks 04 on the displacement block to move relatively, reducing the centering clamping position formed by the left and right centering blocks 04, clamping the lower side arm of the measured torsion spring on the centering clamping position, and realizing the alignment of the lower side arm of the torsion spring with the 0 position;

[0088] Thirdly, the positions of the upper slider assembly and the lower slider assembly on the scale boss are set, that is, the butterfly screw 10 is loosened, the upper slider assembly is rotated to the upper limit angle value of the measured torsion spring, and the butterfly screw 10 is locked, the lower slider assembly is rotated to the lower limit angle value of the measured torsion spring, and the butterfly screw 10 is locked, and the upper and lower limit setting of the angle of the measured torsion spring is completed.

[0089] Fourthly, the two side movement pressure rods 12 are pressed down to adjust the height position of the upper side arm of the torsion spring to approach the plane height of the slide ruler, so as to facilitate the judgment of whether the angle of the torsion spring is within the upper and lower limit range of the measured torsion spring angle; after the height is adjusted appropriately, the locking nut 16 is screwed to fix the position of the inner main body 02, and the measured height is locked.

[0090] Finally, it is judged whether the upper side arm of the torsion spring is within the angle range between the two slider assemblies. If the upper side arm of the torsion spring is within the angle range between the two slider assemblies, it is considered to be qualified.

[0091] When the measurement is completed, the centering pressure rod 12 is pressed to open the centering clamping position, and the torsion spring can be taken out.

[0092] When repeating the measurement of the angle qualification of other torsion springs, only the torsion spring needs to be replaced, the centering pressure rod 12 is pressed to open the centering clamping position, the torsion spring is worn on the center positioning shaft 20, the lower side arm is placed on the centering clamping position, the force applied to the centering pressure rod 20 is loosened, the centering clamping is realized, and it is judged whether the upper side arm of the torsion spring is within the angle range between the two slider assemblies, that is, the repeated measurement is realized.

[0093] The second embodiment of the present application is:

[0094] The present application provides a universal angle detection gauge for center arm torsion springs, which comprises a center positioning shaft 20, a torsion spring, a slide ruler, a centering assembly, an upper slider assembly and a lower slider assembly. Figure 3, the measuring tool has a measuring angle setting or indicating device, which can provide an actual measurement result of any angle of a center arm torsion spring, and can also realize rapid measurement of whether a part meets the upper and lower limits of the required angle range. The measuring tool has wide applicability of measuring methods and measuring angle ranges, and is applicable to torsion spring parts with different wire diameters, different working circle lengths, different working inner diameter (outer diameter) sizes, different force arm lengths, and different rotational direction torsion spring parts, and has wide applicability to torsion spring structural characteristics.

[0095] The main structural components of the measuring tool include an outer main body 01 Figure 7 , a sliding block assembly, a sliding ruler 06 Figure 16 , an inner main body 02, a centering assembly, a center positioning shaft 20, and other component structures. The outer main body 01, the sliding block assembly, and the sliding ruler 06 are used in cooperation to form the angle setting or indicating function of the measuring tool.

[0096] The angle setting or indicating device of the measuring tool includes the outer main body 01 with an angle scale, the sliding block assembly, the sliding ruler 06, a butterfly screw 10, and a compression screw 08. The device has a display or indicating measurement function of any angle from 0° to 360°. The sliding block assembly includes an upper sliding block assembly and a lower sliding block assembly. The sliding block assembly is radially limited by the circular arc ring groove on the upper sliding block 09 and the lower sliding block 05 and the scale disc boss of the outer main body 01. The sliding block assembly is axially limited on the scale disc boss of the outer main body 01 by the first positioning baffle 07 and the screw. The above limiting structure functions make the sliding block assembly only rotate along the scale disc of the outer main body 01. The sliding block assembly has the function of circumferential free rotation along the scale disc of the outer main body 01. The rotation process can be position-fixed by the butterfly screw 10 to achieve the requirement of setting the upper and lower limit angle values of the measured torsion spring angle. The angle setting or indicating device of the measuring tool includes the sliding ruler 06 with adjustable radial position. The sliding ruler 06 has an elliptical position fixing groove with adjustable fixed position. The position fixing groove cooperates with the position fixing pin on the upper sliding block 09 or the lower sliding block 05, and then is locked by the compression screw 08. This structure makes the measuring tool applicable to torsion springs with different force arm lengths.

[0097] The inner main body 02 of the measuring tool includes a centering assembly Figure 8-11) The displacement block sliding groove and the centering block sliding groove have a vertical positional relationship on the part. The existence of the sliding groove provides a structural position for the installation of the centering assembly and realizes the motion direction conversion of the displacement block 18 and the centering block with a vertical motion direction feature. The centering assembly is fixed on the inner body 02 and moves up and down in the hole of the outer body 01 together with the inner body 02. The inner body 02 has a function of preventing circumferential rotation, which is realized by limiting the circumferential motion of the movement pressure rod 12 fixed on the inner body 02, so that the movement pressure rod 12 can only move up and down along the lateral oval ring groove of the outer body 01. The shaft diameter of the movement pressure rod 12 is in small gap cooperation with the width of the oval ring groove, which ensures that the circumferential relative position of the inner body 02 relative to the dial of the outer body 01 is fixed. The inner body 02 has a center positioning hole that can fix different mandrels.

[0098] The centering assembly mainly includes a centering block ( Figure 12 ), a centering pressure rod 12 ( Figure 20 ), a displacement block 18 ( Figure 17-19 ), a second reset spring 17, a second positioning baffle 19, a fixing screw and other parts. The centering assembly mainly realizes the clamping and fixing of the force arm of the measured torsion spring, is suitable for torsion springs with different wire diameters, and makes the clamped torsion spring force arm always point to the zero scale position of the dial of the outer body 01. The displacement block 18 has a V-shaped sliding channel for installing the cylindrical structure of the centering block, and two centering blocks are symmetrically installed in the V-shaped sliding channel. When the displacement block moves, the two centering blocks are pushed to move in the centering block sliding groove of the inner body 02 through the V-shaped sliding channel, realizing the motion direction conversion of the displacement block 18 and the centering block, and realizing the opposite motion or relative motion of the two centering blocks. The second positioning baffle 19 in the centering assembly is fixed with the inner body 02 by a fixing screw, forming a barrier for the second reset spring 17 in the centering assembly. When the external force applied to the centering pressure rod 12 is removed, the second reset spring 17 pushes the displacement block 18 to move, preventing the reset function from failing. One end of the centering pressure rod 12 in the centering assembly has a threaded structure connected with the threaded hole on the displacement block 18, and the centering pressure rod 12 extends out of the outer body 01 through the oval groove on the outer body 01. When the centering assembly is used to clamp the torsion spring force arm, it is easy to operate.

[0099] During measurement, first, according to the size of the different working circle inner diameters of the torsion spring, the appropriate center positioning shaft 20 is selected, the center positioning shaft 20 is inserted into the center positioning hole on the inner body 02, realizing the applicability to different working circle inner diameters, and the inner diameter hole of the measured torsion spring and the center positioning shaft 20 are used for fixed positioning, so that the torsion spring working circle axis coincides with the center positioning shaft.

[0100] Secondly, by pressing the centering pressure rod 12 in the centering assembly, the displacement block 18 is pushed inward, driving the two centering blocks on the displacement block 18 to move towards each other, opening the centering clamping position formed by the two centering blocks, and placing one side (the lower side) of the force arm of the measured torsion spring on the centering clamping position. After removing the external force applied to the centering pressure rod 12, the displacement block 18 can drive the two centering blocks to automatically clamp the force arm of the measured part under the action of the second return spring 19, realizing the clamping of the force arm of the torsion spring at the 0 position of the scale.

[0101] Thirdly, press the two side movement pressure rods 12 to adjust the height position of the other side of the force arm of the torsion spring, so that it is close to the scale position, facilitating accurate reading of the angle value; after the height is adjusted appropriately, screw the locking nut 16 to fix the position of the inner main body 02, realizing the locking of the measured height.

[0102] Finally, read the scale value of the circumferential scale indicated by the upper side of the force arm of the torsion spring, which is the measured degree of the torsion spring.

[0103] When the measurement is completed, press the centering pressure rod 12 to open the centering clamping position, and the torsion spring can be taken out.

[0104] When repeating the measurement, only the torsion spring needs to be replaced, the centering pressure rod 12 is pressed to open the centering clamping position, the torsion spring is strung on the center positioning shaft 20, and the lower side of the force arm is placed in the centering clamping position. Loosen the force applied to the centering pressure rod 20 to realize the centering clamping, read the scale value of the circumferential scale indicated by the upper side of the force arm of the torsion spring, which realizes the repeated measurement.

[0105] When only the torsion spring angle needs to be determined whether it meets the angle range, the lower slide block assembly and the upper slide block assembly can be rotated to make the scale indicated by the slide ruler 06 be the upper limit and lower limit scale of the measured angle, and the butterfly screw 10 is locked to fix the position of the lower slide block assembly and the upper slide block assembly. At this time, the upper and lower slide block assemblies form the allowable angle range of the measured torsion spring.

[0106] When the torsion spring angle is detected, only the appropriate center positioning shaft 20 needs to be selected and replaced, and the two side movement pressure rods 12 are adjusted to obtain the appropriate height of the upper side of the force arm of the torsion spring, so that it is close to the scale position. After completing the above setting, press the centering pressure rod 12 to open the centering clamping position, string the torsion spring on the center positioning shaft 20, and place the lower side of the force arm in the centering clamping position. Loosen the force applied to the centering pressure rod 12 to realize the centering clamping. Only the upper side of the force arm of the measured torsion spring needs to be determined whether it is between the upper and lower slide block assemblies (the upper and lower limit range). If it is between the upper and lower slide block assemblies, it is qualified. If it is not between the upper and lower slide block assemblies, it is unqualified. Through the above process, it can be judged whether the torsion spring angle is qualified, realizing rapid batch detection.

[0107] The embodiment relates to a tool structure which is simple, compact, low in manufacturing cost, convenient in measurement operation, accurate in measurement result, and good in torsional spring structure universality and applicability; has a measurement function of a special angle block, and has a real measurement function of an arbitrary angle value; reduces the manufacturing number of torsional spring angle blocks, reduces the measuring tool use cost, and reduces the period of manufacturing special measuring tools; and meets the current technical requirements of short production cycle, low cost, and high quality.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A universal angle measuring tool for center arm torsion spring, characterized in that: The outer body comprises an outer body, which is a cylindrical barrel structure, and a scale boss is arranged at one end. The upper slider assembly and the lower slider assembly are slidably arranged on the scale boss. The outer cylindrical surface is provided with lateral elliptical ring grooves a, b, c and d; the inner body is arranged in the outer body hole and slides with the outer body. Two relative motion pressure rods are arranged on the outer cylindrical surface of the inner body. The motion pressure rods slide with the lateral elliptical ring grooves a and c relative to the outer body. A locking nut is arranged on the outer cylindrical surface of the inner body, and the locking nut slides with the lateral elliptical ring groove b; the centering assembly comprises a left centering block, a right centering block, a centering pressure rod, a displacement block, a second reset spring and a displacement baffle. The displacement block is slidably arranged in the displacement slideway of the inner body, and one end is connected to the centering pressure rod. The centering pressure rod passes through the outer body and slides with the lateral elliptical ring groove d. The other end of the displacement block is connected to the second reset spring The spring contacts, and the second return spring is limited by the second positioning baffle arranged at one end of the displacement slide. The left centering block and the right centering block have the same structure, both including a large square structure, and small square structures and cylinders arranged on both sides of the large square structure. The large square structures of the left centering block and the right centering block are symmetrically arranged on the centering slide of the inner main body, and the cylinders of the left centering block and the right centering block slide in cooperation with the V-shaped slide of the displacement block, and the small square structure protrudes from the upper end surface of the inner main body. By pressing the centering pressure rod, the displacement block is pushed to slide in the displacement slide, driving the cylinders of the left centering block and the right centering block to move toward each other in the V-shaped slide. When the centering pressure rod is released, the second return spring pushes the displacement block to slide in the displacement slide, driving the cylinders of the left centering block and the right centering block to move relative to each other in the V-shaped slide to achieve clamping; the center positioning shaft is fixed in the circular hole in the center of the upper end surface of the inner main body, coaxial with the central axis of the outer main body, and the first return spring is fixed in the inner hole at the lower end of the inner main body.

2. The universal angle measuring tool for center arm torsion spring according to claim 1, characterized in that: The planes where the lateral elliptical annular grooves a and c are located are parallel to the planes where the lateral elliptical annular grooves b and d are located.

3. The universal angle measuring tool for center arm torsion spring according to claim 1, characterized in that: It also includes an end cover, which is installed at the lower end of the outer body, and a hexagonal hole for disassembly is provided at the bottom of the end cover.

4. The universal angle measuring tool for center arm torsion spring according to claim 1, characterized in that: The upper end of the first return spring contacts the inner body, and the lower end contacts the spring fixing hole in the center of the end cover.

5. The universal measuring tool for detecting the angle of the center arm torsion spring according to claim 1, characterized in that: The upper slider assembly and the lower slider assembly are symmetrical in structure, wherein the upper slider assembly includes an upper slider, a slide, a butterfly screw and a first positioning baffle. The first positioning baffle is fixed to the bottom of the upper slider by a screw. The first positioning baffle and the upper slider form a sliding groove that slides with the scale boss on the outer body. An elliptical boss is provided on the top end face of the upper slider, and the elliptical boss cooperates with the elliptical groove on the slide. A threaded hole is provided in the center of the elliptical boss, which cooperates with the thread of the clamping screw to fix the slide in the axial direction.

6. The universal measuring tool for detecting the angle of the center arm torsion spring according to claim 4, characterized in that: The lower slider assembly includes an upper slider, a slide, a butterfly screw and a first positioning baffle. The first positioning baffle is fixed to the bottom of the lower slider by a screw. The first positioning baffle and the lower slider form a sliding groove that slides with the scale boss on the outer body. An elliptical boss is provided on the top end face of the lower slider. The elliptical boss cooperates with the elliptical groove on the slide. A threaded hole is provided in the center of the elliptical boss, which cooperates with the thread of the tightening screw to fix the slide in the axial direction.

7. A method for detecting the angle of a center arm torsion spring, using the measuring tool according to any one of claims 1 to 6, characterized in that: Including the numerical quantitative detection method of torsion spring angle and the qualitative detection method of torsion spring angle qualification; The numerical quantitative detection method of torsion spring angle is: First, according to the different inner diameters of the torsion spring's working circle, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve applicability to different inner diameters of the working circle, and use the inner diameter hole of the torsion spring being tested and the center positioning shaft to fix and position them so that the axis of the torsion spring's working circle coincides with the center positioning shaft; Secondly, by tightening the centering pressure rod in the centering assembly, the displacement block is pushed to move in the displacement slide toward the side of the limit baffle, driving the left and right centering blocks installed on the displacement block to move toward each other, opening the centering clamping position formed by the left and right centering blocks, and placing the lower force arm of the torsion spring to be measured in the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block, under the action of the second return spring force, pushes the displacement block to move in the displacement slide toward the side of the centering pressure rod, driving the left and right centering blocks installed on the displacement block to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks, clamping the lower force arm of the torsion spring to be measured in the centering clamping position, and realizing the alignment of the lower force arm of the torsion spring to the scale 0; Next, press down the moving rods on both sides to adjust the upper and lower height positions of the force arm on the torsion spring so that it is close to the height of the scale boss to facilitate accurate reading of the angle value; when the height is adjusted appropriately, tighten the locking nut to fix the position of the inner body to lock the measured height; Finally, read the scale value on the circular scale boss pointed by the upper force arm of the torsion spring, which is the degree of the torsion spring being measured; When the measurement is completed, press the centering lever, open the centering clamping position, and take out the torsion spring; Qualitative test method for the conformity of torsion spring angle: First, according to the different inner diameters of the torsion spring's working circle, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve applicability to different inner diameters of the working circle, and use the inner diameter hole of the torsion spring being tested and the center positioning shaft to fix and position them so that the axis of the torsion spring's working circle coincides with the center positioning shaft; Secondly, by pressing the centering pressure rod in the centering assembly, the displacement block is pushed to move in the displacement slide toward the side of the second positioning baffle, driving the left and right centering blocks installed on the displacement block to move toward each other, opening the centering clamping position formed by the left and right centering blocks, and placing the lower force arm of the torsion spring to be measured in the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block, under the action of the second return spring force, pushes the displacement block to move in the displacement slide toward the side of the centering pressure rod, driving the left and right centering blocks installed on the displacement block to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks, clamping the lower force arm of the torsion spring to be measured on the centering clamping position, and realizing that the lower force arm of the torsion spring is aligned with the scale 0; Next, set the position of the upper and lower slider assemblies on the scale boss: loosen the butterfly nut, rotate the upper slider assembly to the upper limit angle value of the torsion spring angle to be measured, and tighten the butterfly nut, rotate the lower slider assembly to the lower limit angle value of the torsion spring angle to be measured, and tighten the butterfly nut to complete the setting of the upper and lower limits of the torsion spring angle to be measured; Fourth, press down the moving rods on both sides to adjust the upper and lower height positions of the force arm on the torsion spring so that it is close to the height of the plane where the slide is located, so as to facilitate the judgment of whether the torsion spring angle is within the upper and lower limits of the measured torsion spring angle; when the height is adjusted appropriately, tighten the locking nut to fix the position of the inner body and lock the measured height; Finally, determine whether the upper force arm of the torsion spring is within the angle range between the two slider assemblies. If so, it is considered qualified. When the measurement is completed, press the centering lever, open the centering clamping position, and take out the torsion spring.

8. The method for detecting the angle of the center arm torsion spring according to claim 7, characterized in that: To repeatedly measure other torsion spring angle values, simply replace the torsion spring, press the centering lever, open the centering clamping position, thread the torsion spring onto the center positioning shaft, and place the lower force arm at the centering clamping position. Release the force applied to the centering lever to achieve centering clamping, and read the scale value of the circular scale pointed to by the upper force arm of the torsion spring to achieve repeated measurement.

9. The method for detecting the angle of the center arm torsion spring according to claim 7, characterized in that: When repeatedly measuring the angle eligibility of other torsion springs, you only need to replace the torsion spring, press the centering pressure rod, open the centering clamping position, pass the torsion spring on the center positioning shaft, and place the lower force arm at the centering clamping position. Release the force applied to the centering pressure rod to achieve centering clamping, and determine whether the upper force arm of the torsion spring is within the angle range between the two slider assemblies to achieve repeated measurement.

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