Universal angle detection measuring tool and method for central arm torsion spring

Abstract

The invention relates to the technical field of torsional spring angle detection measuring tools, in particular to a universal angle detection measuring tool and method for a central arm torsional spring, and the device comprises an outer main body, a sliding block assembly, a sliding ruler, an inner main body assembly, a centering assembly and the like. Measurement, use and operation are convenient, the measurement result is accurate, and the torsion spring structure universality and applicability are good; the measuring function of replacing the existing special angle sample block can be met, and the function of actually measuring any angle value is achieved; the processing and manufacturing number of the torsion spring angle gauge blocks is reduced, the use cost of the measuring tool is reduced, and the period of manufacturing a special measuring tool is also reduced; and the technical requirements of short production cycle, low cost and high quality at present are met.

Description

Technical Field

[0001] The 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 the production is completed, the torsion spring angle needs to be tested, and the products with angle deviation within a certain range are qualified products. The detection method can be selected from direct projection detection or detection using special measuring tools. Among them, direct projection detection involves spatial angle dimensions, is difficult to locate, complicated to operate, and inefficient, so it is not suitable for large-scale product detection. In actual processing, the factory uses a regularly calibrated upper and lower difference angle sample block (Chinese invention patent with announcement number CN218787797U) for detection; but the measuring tool with upper difference angle sample block and lower difference angle sample block has the uniqueness of the detection angle range, and cannot test the specific value of the torsion spring angle, and can only make a qualified judgment. And this special torsion spring angle detection sample block usually has a small applicable range for the outer diameter size of the torsion spring that plays a positioning role in the detection process, and has poor versatility; it also has restrictions on the length size of the working circle of the torsion spring. Therefore, the torsion spring angle detection sample block actually used in the factory has strong specificity and poor versatility.

[0003] The existence of the above problems requires that in order to meet the production, manufacturing and testing needs of various torsion spring structures in the factory, various types of special torsion spring angle testing specimens are required, which has high manufacturing and management costs.

[0004] The Chinese invention patent "A rapid detection tool for torsion spring angle" with announcement number CN218787797U discloses a detection device with fixed upper and lower angle limits, fixed height, and fixed outer diameter of the torsion spring working circle. This measuring tool can only detect torsion springs of specific structural dimensions and is not universal; the Chinese invention patent "A torsion spring angle detection device" with announcement number CN208567750U discloses a structure with two left and right limit blocks for angle detection of left-handed and right-handed torsion springs respectively; this measuring tool is also unable to perform rapid detection of whether the upper and lower limits of the detection angle are qualified; the Chinese invention patent "An auxiliary tooling that can test the angle of torsion springs simply and conveniently" with announcement number CN220250895U discloses a device that fixes the torsion spring through a mechanical structure and then uses a handheld test ruler to test the angle of the force arm. It is only applicable to tangent arm torsion springs, and the test process has high requirements for manual operation. Therefore, it is necessary to newly develop a universal angle detection measuring tool for center arm torsion springs. Summary of the invention

[0005] The purpose of the present invention is to provide a universal angle detection gauge and method for a center arm torsion spring; to solve the singleness of the current torsion spring angle detection gauge or method, to achieve a set of gauges that can detect both the upper and lower limits of the torsion spring angle and the numerical value of the torsion spring angle; to be suitable for parts detection of different torsion spring outer diameters (inner diameters), different torsion spring steel wire diameters, different torsion spring force arm lengths, and different torsion spring working circle lengths. To make the torsion spring angle detection gauge universal, more widely applicable, and more convenient to use. To reduce the manufacturing and management costs of special torsion spring angle detection gauges.

[0006] Technical solution:

[0007] A universal angle detection measuring tool for a center arm torsion spring comprises an outer body, which is a cylindrical barrel structure, one end of which is provided with a scale boss, an upper slider assembly and a lower slider assembly are slidably arranged on the scale boss, and a lateral elliptical ring groove a, a lateral elliptical ring groove b, a lateral elliptical ring groove c and a lateral elliptical ring groove d are arranged on the outer cylindrical surface; an inner body is arranged in the hole of the outer body and slides with the outer body, and two relative motion pressure rods are arranged on the outer cylindrical surface of the inner body, and the motion pressure rod slides with the lateral elliptical ring groove a and the lateral elliptical ring groove c relative to the outer body, and 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; 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 slidably arranged in the displacement slideway of the inner body, one end of which is connected with the centering pressure rod, the centering pressure rod passes through the outer body and slides with the lateral elliptical ring groove d, and the displacement block is also provided with 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, one end of which is connected with the centering pressure rod, the centering pressure rod passes through the outer body and slides with the lateral elliptical ring groove d, and the displacement block is provided with a left centering block, a right centering block, a centering pressure rod and a displacement block, and a displacement baffle is provided on the outer cylindrical surface of the inner body. One end is in contact with the second return spring, 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, and the centering pressure rod is released, and 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.

[0008] Furthermore, 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.

[0009] Furthermore, 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.

[0010] Furthermore, the upper end of the first return spring contacts the inner body, and the lower end contacts the spring fixing hole at 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 includes an upper slider, a slide ruler, a butterfly screw and a first positioning baffle, the first positioning baffle is fixed to the bottom of the upper slider by screws, the first positioning baffle and the upper slider form a sliding groove that slidably cooperates with the scale boss on the outer body, an elliptical boss is arranged on the top end face of the upper slider, the elliptical boss cooperates with the elliptical groove on the slide ruler, a threaded hole is arranged in the center of the elliptical boss, which cooperates with the thread of the clamping screw to fix the slide ruler in the axial direction.

[0013] further,

[0014] The lower slider assembly includes an upper slider, a slide ruler, a butterfly screw and a first positioning baffle. The first positioning baffle is fixed to the bottom of the lower slider by screws. The first positioning baffle and the lower slider form a sliding groove that slidably cooperates with the scale boss on the outer body. An elliptical boss is arranged on the top end face of the lower slider. The elliptical boss cooperates with the elliptical groove on the slide ruler. A threaded hole is arranged in the center of the elliptical boss, which cooperates with the thread of the clamping screw to fix the slide ruler in the axial direction.

[0015] A method for detecting the angle of a center arm torsion spring, using the detection gauge to measure, including a method for quantitative detection of the torsion spring angle value and a method for qualitative detection of the torsion spring angle conformity;

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

[0017] First, according to the different working circle inner diameters of the torsion spring, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve the applicability of different working circle inner diameters, and use the inner diameter hole of the torsion spring to be measured and the center positioning shaft to fix and position, so that the axis of the working circle of the torsion spring coincides with the center positioning shaft;

[0018] Secondly, by pressing the centering pressure rod in the centering assembly, the displacement block is pushed to move toward the side of the limit baffle in the displacement slideway, 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, placing the lower side force arm of the torsion spring to be measured on the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block is pushed to move toward the side of the centering pressure rod in the displacement slideway under the action of the second reset spring force, 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 side force arm of the torsion spring to be measured on the centering clamping position, and realizing the alignment of the lower side 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 to make it close to the height of the scale boss, so as to accurately read 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 working circle inner diameters of the torsion spring, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve the applicability of different working circle inner diameters, and use the inner diameter hole of the torsion spring to be measured and the center positioning shaft to fix and position, so that the axis of the working circle of the torsion spring 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 toward the side of the second positioning baffle in the displacement slideway, 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, placing the lower side force arm of the torsion spring to be measured on the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block is pushed to move toward the side of the centering pressure rod in the displacement slideway under the action of the second return spring force, 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 side force arm of the torsion spring to be measured on the centering clamping position, and realizing the alignment of the lower side force arm of the torsion spring to the scale 0;

[0025] Next, 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 torsion spring angle to be measured, and lock the butterfly nut, rotate the lower slider assembly to the lower limit angle value of the torsion spring angle to be measured, and lock the butterfly nut to complete the setting of the upper and lower limits of the torsion spring angle to be measured;

[0026] Fourth, press down the moving pressure rods on both sides to adjust the upper and lower height positions of the force arm on the torsion spring to make it close to the plane height where the slide ruler is located, so as to judge 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 to lock the measured height;

[0027] Finally, determine whether the upper force arm of the torsion spring is within the angle range between the two slider assemblies. If the upper force 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, open the centering clamping position, and take out the torsion spring.

[0029] Furthermore, when repeatedly measuring the angle values ​​of other torsion springs, it is only necessary 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, read the scale value of the circular dial pointed to by the upper force arm of the torsion spring, and achieve repeated measurement.

[0030] Furthermore, when repeatedly measuring the angle compliance of other torsion springs, it is only necessary 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, thereby achieving repeated measurement.

[0031] Beneficial effects:

[0032] The present invention provides a universal angle detection measuring tool and method for a center arm torsion spring. The measuring tool of the present invention has a simple and compact structure, low processing and manufacturing cost, convenient measurement and operation, accurate measurement results, and 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 any angle value; it reduces the processing and manufacturing number of torsion spring angle blocks, reduces the cost of using the measuring tool, and also reduces the cycle of making the special measuring tool; it meets the current technical requirements for short production cycle, low cost and high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required to be used in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the structure of the central arm torsion spring introduced in the background technology of the present invention;

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

[0036] Figure 3 It is a schematic diagram of the appearance and outline structure of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

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

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

[0039] Figure 6 yes Figure 5 Cross-sectional view along AA direction;

[0040] Figure 7 This is a schematic diagram of the outer body structure of an embodiment of a central arm torsion spring angle detection measuring tool provided by the present invention;

[0041] Figure 8 The structure of the inner main body parts of a central arm torsion spring angle detection measuring tool provided by the present invention is shown in FIG. Figure 1 ;

[0042] Fig. 9 The structure of the inner main body parts of a central arm torsion spring angle detection measuring tool provided by the present invention is shown in FIG. Figure 2 ;

[0043] Fig.10 It is a top view of the structure of the inner main body parts of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0044] Fig.11 yes Fig.10 Cross-sectional view along direction BB;

[0045] Fig.12 It is a schematic diagram of the structure of the left and right centering blocks of a central arm torsion spring angle detection measuring tool embodiment provided by the present invention;

[0046] Fig.13 It is a schematic diagram of the structure of the lower slider parts of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0047] Fig.14 It is a schematic diagram of the structure of the upper slider parts of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0048] Fig.15 It is a schematic structural diagram of a positioning baffle part of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0049] Fig.16 It is a schematic structural diagram of a sliding ruler part of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0050] Fig.17 The present invention provides a central arm torsion spring angle detection measuring tool embodiment of the displacement block parts structure schematic diagram Figure 1 ;

[0051] Fig.18 The present invention provides a central arm torsion spring angle detection measuring tool embodiment of the displacement block parts structure schematic diagram Figure 2 ;

[0052] Fig.19 The present invention provides a central arm torsion spring angle detection measuring tool embodiment of the displacement block parts structure schematic diagram Figure 3 ;

[0053] Fig. 20 It is a schematic structural diagram of a centering pressure rod part of an embodiment of a center arm torsion spring angle detection measuring tool provided by the present invention;

[0054] Fig.21 The present invention provides a schematic diagram of the structure of the center positioning shaft parts of a center arm torsion spring angle detection measuring tool embodiment.

[0055] In the attached drawings: 01—outer body, 02—inner body, 03—left centering block, 04—right centering block, 05—lower slider, 06—slide rule, 07—first positioning baffle, 08—tensioning screw, 09—upper slider, 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 purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0058] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] See attached Figure 3-21 , the first embodiment of the present invention is:

[0060] A universal angle detection measuring tool for a center arm torsion spring is proposed, comprising an outer body 01. The outer body 01 is a cylindrical barrel structure, and a scale boss is arranged at one end. It has the function of displaying or indicating any angle of 0°-360°. An upper slider assembly and a lower slider assembly are slidably arranged on the scale boss. The upper and lower slider assemblies have the function of freely rotating in a circle along the scale disk of the outer body 01. The position can be fixed by a butterfly screw during the rotation process to achieve the upper and lower limit angle value requirements of the measured torsion spring angle.

[0061] The outer cylindrical surface of the outer main body 01 is provided with lateral elliptical ring groove a, lateral elliptical ring groove b, lateral elliptical ring groove c and lateral elliptical ring groove d; the inner main body 02 is arranged in the hole of the outer main body 01 and slides with the outer main body 01, and two relative movement pressure rods 11 are arranged on the outer cylindrical surface of the inner main body 02, and the movement pressure rods 11 slide with the lateral elliptical ring groove a and lateral elliptical ring groove c relative to the outer main body 01, and a locking nut 16 is arranged on the outer cylindrical surface of the inner main body 02, and the locking nut 16 slides with the lateral elliptical ring groove b; the inner main body 02 has the function of moving up and down, and has the function of locking and fixing at any position in the upper and lower activity space.

[0062] The up and down movement of the inner body 01 realizes the torsion springs suitable for different working circle lengths, so that the measured torque arm of the measured torsion spring is close to the dial or slide ruler of the measuring tool, and the accuracy of the reading of the measuring tool is improved. The movement function of the inner body 01 is to realize the downward movement of the inner body 02 by pressing the moving pressure rod 11; the inner body 02 realizes upward movement under the action of the first reset spring 15; the position locking of the inner body 02 during the movement is realized by screwing the locking screw 16 to fix the position. The inner body 02 has the function of preventing circumferential rotation. This function is to limit the circumferential movement of the moving pressure rod 11 fixed on the inner body 02, so that the moving pressure rod 11 can only move up and down along the lateral elliptical ring groove of the outer body 01, and the axial diameter of the moving pressure rod 11 and the width of the elliptical ring groove form a small gap to ensure that the circumferential relative position of the inner body 02 relative to the dial of the outer body 01 is fixed in the circumferential direction. The inner body 02 is provided with a center positioning hole for fixing different core shafts. When measuring, according to the different inner diameters of the working circles of the torsion spring, the diameter of the center positioning shaft 20 is selected to be suitable, and inserted into the center positioning hole on the inner body 02 to achieve fixed positioning using the inner diameter hole of the torsion spring being measured.

[0063] A centering component is installed on the inner body 02, and the centering component moves up and down together with the inner body 02; the centering component mainly realizes the clamping and fixing of the force arm at one end of the torsion spring to be measured, 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.

[0064] The centering assembly includes a left centering block 03, a right centering block 04, a centering pressure rod 12, a displacement block 18, a second return spring 17, and a second displacement baffle 19. The displacement block 18 is slidably arranged in the displacement slideway of the inner body 02, and one end is connected to the centering pressure rod 12. The centering pressure rod 12 passes through the outer body 01 and slides with the lateral elliptical ring groove d. The other end of the displacement block 18 contacts the second return spring 17, and the second return spring 17 is limited by the displacement baffle 18 arranged at one end of the displacement slideway. The left centering block 03 and the right centering block 04 have the same structure, both of which include 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 03 and the right centering block 04 are symmetrically arranged. On the centering slide of the inner main body 02, the cylinders of the left centering block 03 and the right centering block 04 are slidably matched 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 02. By pressing the centering pressure rod 12, the displacement block 18 is pushed to slide in the displacement slide, driving the cylinders of the left centering block 03 and the right centering block 04 to move toward each other in the V-shaped slide. After the centering pressure rod 12 is released, the second return spring 17 pushes the displacement block 18 to slide in the displacement slide, driving the cylinders of the left centering block 03 and the right centering block 04 to move relative to each other in the V-shaped slide to achieve clamping; the center positioning shaft 20 is fixed in the circular hole in the center of the upper end surface of the inner main body 02, coaxial with the central axis of the outer main body 01, and the first return spring 15 is fixed in the inner hole at the lower end of the inner main body.

[0065] When clamping the torsion spring, by pressing the centering pressure rod 12 in the centering assembly, the displacement block 18 is pushed inward, driving the two centering blocks installed on the displacement block 18 to move toward each other, opening the clamping centering position, and removing the external force applied to the centering pressure rod 12. Under the action of the second reset spring 17, the displacement block 18 can drive the two centering blocks to automatically clamp the force arm of the measured part.

[0066] The inner body 02 has a displacement block slide and a centering slide in a vertical position relationship; the existence of the above slide provides a structural position for the installation of the centering component; it also realizes the movement direction conversion of the displacement block 18 and the centering block with vertical movement direction characteristics.

[0067] The displacement block 18 is provided with a V-shaped slide for installing the cylindrical structure of the centering block, and two centering blocks are symmetrically installed in the V-shaped slide; when the displacement block moves, the two centering blocks are pushed to move in the centering slide of the inner main body 02 through the V-shaped slide, thereby realizing the conversion of the movement direction of the displacement block 18 and the centering block, and also realizing the toward or relative movement of the two centering blocks.

[0068] The second displacement baffle 19 in the centering assembly is fixed to the inner body 02 by fixing screws, forming a second return spring 17 in the centering assembly. When the external force applied to the centering pressure rod 12 is cancelled, the second return spring 17 pushes the displacement block 18 to move, preventing the return function from failing.

[0069] One end of the centering pressure rod 12 in the centering assembly has a threaded structure connected to the threaded hole on the displacement block 18, and the centering pressure rod 12 extends out of the outer body 01 through the elliptical groove on the outer 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 invention has a measuring angle setting or indicating device, and can provide a measuring tool for the actual measurement degree result of any angle of the center arm torsion spring. At the same time, it can also realize the rapid measurement of whether the parts meet the upper and lower limits of the required angle range, and has wide applicability of measurement methods and measurement angle ranges; the measuring tool is suitable for torsion spring parts with different steel wire diameters, parts with different working circle lengths, parts with different working inner diameter (outer diameter) sizes, different force arm length sizes, and torsion spring parts with different rotation directions, and has wide applicability of torsion spring structural characteristics.

[0071] In this embodiment, the planes where the lateral elliptical annular grooves a and c on the outer body 01 are located are parallel to the planes where the lateral elliptical annular grooves b and d are located.

[0072] In this embodiment, the measuring tool of the present invention further includes an end cover 14, which is mounted on the lower end of the outer body 01, and a hexagonal hole for disassembly is provided at the bottom of the end cover 14.

[0073] In this embodiment, the upper end of the first return spring 15 contacts the inner body 02 , and the lower end contacts the spring fixing hole at the center of the end cover 14 .

[0074] In this embodiment, the upper slider assembly and the lower slider assembly are symmetrical in structure, wherein the upper slider assembly includes an upper slider 09, a slide ruler 06, a butterfly screw 10 and a first positioning baffle 7, the first positioning baffle 7 is fixed to the bottom of the upper slider by the butterfly screw 10, the first positioning baffle 7 and the upper slider 09 form a sliding groove that slidably cooperates with the scale boss on the outer body 01, an elliptical boss is arranged on the top end face of the upper slider 09, the elliptical boss cooperates with the elliptical groove on the slide ruler 06, a threaded hole is arranged in the center of the elliptical boss, which is threadedly cooperated with the clamping screw 08 to fix the slide ruler 06 in the axial direction.

[0075] In this embodiment, the lower slider assembly includes an upper slider 05, a slider 06, a butterfly screw 10 and a first positioning baffle 07. The first positioning baffle 07 is fixed to the bottom of the lower slider 05 by the butterfly screw 10. The first positioning baffle 07 and the lower slider 05 form a sliding groove that slides with the scale boss on the outer body 01. The top end surface of the lower slider 05 is provided with an elliptical boss, which cooperates with the elliptical groove on the slider 06. A threaded hole is provided in the center of the elliptical boss, which is threadedly engaged with the clamping screw 06 to fix the slider 06 in the axial direction. The slider assembly includes an upper slider assembly and a lower slider assembly. The slider assembly is radially limited by the arc ring groove on the upper slider 09 and the lower slider 05 and the scale boss of the outer body 01; the slider assembly is fixed by the first positioning baffle 07 and the butterfly screw 10 to realize the axial limitation of the slider assembly on the scale boss of the outer body 01; the above-mentioned limiting structure function enables the slider assembly to rotate only along the scale of the outer body 01.

[0076] The slider assembly also includes a slider 06 with adjustable radial position. The slider 06 structure has an elliptical position fixing groove with adjustable fixed position. The position fixing groove forms a matching relationship with the position fixing pin on the upper slider 09 or the lower slider 05, and the position of the slider 06 is locked by the tightening screw 08. This structural feature makes the measuring tool suitable for different force arm lengths of torsion springs.

[0077] This embodiment also provides a method for detecting the angle of a center arm torsion spring, which is measured using the detection gauge, including a method for quantitatively detecting the angle of a torsion spring and a method for qualitatively detecting the conformity of the angle of a torsion spring;

[0078] The quantitative detection method of torsion spring angle is:

[0079] First, according to the different working circle inner diameters of the torsion spring, select the appropriate diameter of the center positioning shaft 20, insert the center positioning shaft 20 into the center positioning hole on the inner body 02, and realize the applicability to different working circle inner diameters. Use the inner diameter hole of the torsion spring to be tested and the center positioning shaft 20 to fix and position, so that the axis of the working circle of the torsion spring coincides with the center positioning shaft 20;

[0080] Secondly, by pressing the centering pressure rod 12 in the centering assembly, the displacement block 18 is pushed to move toward the second limit baffle 19 in the displacement slideway, driving the left and right centering blocks 04 installed on the displacement block 18 to move toward each other, opening the centering clamping position formed by the left and right centering blocks 04, placing the lower side force arm of the torsion spring to be measured at the centering clamping position, and removing the external force applied to the centering pressure rod 12. Under the action of the second return spring 17, the displacement block 18 is pushed to move toward the centering pressure rod 12 in the displacement slideway, driving the left and right centering blocks 04 installed on the displacement block 18 to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks 04, clamping the lower side force arm of the torsion spring to be measured at the centering clamping position, and realizing the alignment of the lower side force arm of the torsion spring to the scale 0 position;

[0081] Again, press down the moving rods 11 on both sides to adjust the upper and lower height positions of the force arms on the torsion spring to make them close to the height of the scale boss, so as to accurately read the angle value; when the height is adjusted appropriately, screw the locking nut 16 to fix the position of the inner body 02 to lock the measured height;

[0082] 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;

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

[0084] When repeatedly measuring other torsion spring angle values, it is only necessary to replace the torsion spring, press the centering pressure rod 12, open the centering clamping position, pass the torsion spring on the center positioning shaft 20, and place the lower force arm at the centering clamping position. Release the force applied to the centering pressure rod 12 to achieve centering clamping, read the scale value of the circular dial pointed to by the upper force arm of the torsion spring, and achieve repeated measurement.

[0085] Qualitative test method for the conformity of torsion spring angle:

[0086] First, according to the different working circle inner diameters of the torsion spring, select the appropriate diameter of the center positioning shaft 20, insert the center positioning shaft 20 into the center positioning hole on the inner body 02, and realize the applicability to different working circle inner diameters. Use the inner diameter hole of the torsion spring to be tested and the center positioning shaft 20 to fix and position, so that the axis of the working circle of the torsion spring coincides 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 toward the second limit baffle 19 in the displacement slideway, driving the left and right centering blocks 04 installed on the displacement block 18 to move toward each other, opening the centering clamping position formed by the left and right centering blocks 04, and placing the lower side force arm of the torsion spring to be measured at the centering clamping position, and removing the external force applied to the centering pressure rod 12. Under the action of the second return spring 17, the displacement block 18 pushes the displacement block 18 to move toward the centering pressure rod 12 in the displacement slideway, driving the left and right centering blocks 04 installed on the displacement block to move relative to each other, reducing the centering clamping position formed by the left and right centering blocks 04, and clamping the lower side force arm of the torsion spring to be measured at the centering clamping position, so that the lower side force arm of the torsion spring is aligned with the scale 0;

[0088] Next, set the positions of the upper slider assembly and the lower slider assembly on the scale boss: that is, loosen the butterfly screw 10, rotate the upper slider assembly to the upper limit angle value of the torsion spring angle to be measured, and tighten the butterfly screw 10, rotate the lower slider assembly to the lower limit angle value of the torsion spring angle to be measured, and tighten the butterfly screw 10 to complete the setting of the upper and lower limits of the torsion spring angle to be measured;

[0089] Fourth, press down the moving pressure rods 12 on both sides to adjust the upper and lower height positions of the upper force arm of the torsion spring to make it close to the plane height of the slide ruler, so as to judge whether the torsion spring angle is within the upper and lower limits of the measured torsion spring angle; when the height is adjusted appropriately, screw the locking nut 16 to fix the position of the inner body 02 to achieve the locking of the measured height;

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

[0091] When the measurement is completed, press the centering pressure rod 12, open the centering clamping position, and take out the torsion spring.

[0092] When repeatedly measuring the angle eligibility of other torsion springs, it is only necessary to replace the torsion spring, press the centering pressure rod 12, open the centering clamping position, pass the torsion spring on the center positioning shaft 20, and place the lower force arm at the centering clamping position. Release the force applied to the centering pressure rod 20 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.

[0093] A second embodiment of the present invention is:

[0094] The present invention proposes a universal angle detection measuring tool for a center arm torsion spring. Figure 3The measuring tool has a measuring angle setting or indicating device, which can provide a measuring tool for measuring the degree result of any angle of the center arm torsion spring, and can also realize the rapid measurement of whether the parts meet the upper and lower limits of the required angle range. It has wide applicability of measurement methods and measurement angle ranges; the measuring tool is suitable for torsion spring parts with different wire diameters, parts with different working circle lengths, parts with different working inner diameters (outer diameters), parts with different arm lengths, and parts with different rotation directions. It has a wide range of applicability of torsion spring structural characteristics.

[0095] The main structural components of the measuring tool are: outer body 01 ( Figure 7 )、Slider assembly、Slide ruler 06( Fig.16 ), inner body 02, centering assembly, center positioning shaft 20 and other parts and components. Among them, the outer body 01, the slider assembly, and the slider 06 are used in conjunction with each other to form the angle setting or indicating function of the measuring tool.

[0096] The angle setting or indicating device of the measuring tool includes an outer body 01 with an angle dial, a slider assembly, a slide ruler 06, a butterfly screw 10, a clamping screw 08 and other structural parts; the device has the function of displaying or indicating measurements at any angle from 0° to 360°. The slider assembly includes an upper slider assembly and a lower slider assembly. The slider assembly is radially limited by the arc ring grooves on the upper slider 09 and the lower slider 05 and the dial boss of the outer body 01; the slider assembly is axially limited on the dial boss of the outer body 01 by fixing with the first positioning baffle 07 and screws; the above-mentioned limiting structure function enables the slider assembly to rotate only along the dial of the outer body 01. The slider assembly has the function of free rotation along the circumference of the dial of the outer body 01. The butterfly screw 10 can be used to fix the position during the rotation process to achieve the upper and lower angle value requirements of the angle of the measured torsion spring. The angle setting or indicating device of the measuring tool includes a slide 06 with an adjustable radial position. The slide 06 has an elliptical position fixing groove with an adjustable fixed position. The position fixing groove forms a matching relationship with the position fixing pin on the upper slider 09 or the lower slider 05, and the position of the slide is locked by the tightening screw 08. This structural feature makes the measuring tool suitable for different force arm lengths of torsion springs.

[0097] The inner body 02 of the measuring tool ( Figure 8-11) parts have displacement block slide grooves and centering block slide grooves with vertical position relationship; the existence of the above-mentioned slide grooves provides a structural position for the installation of the centering assembly; it also realizes the movement direction conversion of the displacement block 18 and the centering block with vertical movement direction characteristics; 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 the function of preventing circumferential rotation, which is achieved by limiting the circumferential movement of the moving pressure rod 12 fixed on the inner body 02, so that the moving pressure rod 12 can only move up and down along the lateral elliptical ring groove of the outer body 01, and the axial diameter of the moving pressure rod 12 and the width of the elliptical ring groove form a small gap to ensure that the circumferential relative position of the inner body 02 relative to the circumferential dial of the outer body 01 is fixed; the inner body 02 has a central positioning hole for fixing different core shafts.

[0098] The centering components mainly include centering blocks ( Fig.12 ), centering pressure rod 12 ( Fig. 20 )、Displacement block 18( Figure 17-19 ), the second reset spring 17, the second positioning baffle 19, the fixing screws and other parts. The centering component is mainly used to clamp and fix the force arm of one end of the torsion spring to be measured. It 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 slideway for installing the cylindrical structure of the centering block. Two centering blocks are symmetrically installed in the V-shaped slideway; when the displacement block moves, the two centering blocks are pushed to move in the centering block slideway of the inner body 02 through the V-shaped slideway, realizing the conversion of the movement direction of the displacement block 18 and the centering block, and also realizing the opposite movement or relative movement of the two centering blocks. The second positioning baffle 19 in the centering component is fixed to the inner body 02 by a fixing screw to form a block for the second reset spring 17 in the centering component. When the external force applied to the centering pressure rod 12 is cancelled, the second reset spring 17 force pushes the displacement block 18 to move to prevent the reset function from failing. One end of the centering pressure rod 12 in the centering assembly has a threaded structure connected to the threaded hole on the displacement block 18, and the centering pressure rod 12 extends out of the outer body 01 through the elliptical groove on the outer body 01; when the centering assembly is used to clamp the torsion spring force arm, the operation is convenient.

[0099] During measurement, first, according to the different inner diameters of the working circles of the torsion spring, select the appropriate diameter of the center positioning shaft 20, insert the center positioning shaft 20 into the center positioning hole on the inner body 02 to achieve applicability to different inner diameters of the working circles, and use the inner diameter hole of the torsion spring being measured and the center positioning shaft 20 for fixed positioning so that the axis of the working circle of the torsion spring coincides with the center positioning shaft.

[0100] Secondly, by tightening the centering pressure rod 12 in the centering assembly, the displacement block 18 is pushed inward, driving the two pairs of centering blocks installed on the displacement block 18 to move toward each other, opening the centering clamping position formed by the two pairs of centering blocks, and placing the force arm of one side (lower side) of the torsion spring to be measured on the centering clamping position, removing the external force applied to the centering pressure rod 12, and the displacement block 18, under the action of the second reset spring 19, can drive the two pairs of centering blocks to automatically clamp the force arm of the measured part, so that the force arm at one end of the torsion spring is aligned with the scale at 0.

[0101] Again, press down the moving pressure rods 12 on both sides to adjust the upper and lower height positions of the force arm on the other side of the torsion spring to make it close to the dial position, so as to accurately read the angle value; when the height is adjusted appropriately, screw the locking nut 16 to fix the position of the inner body 02 to lock the measured height.

[0102] Finally, read the value of the scale on the circular dial pointed by the upper force arm of the torsion spring, which is the degree of the torsion spring being measured.

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

[0104] When repeating the measurement, it is only necessary to replace the torsion spring, press the centering pressure rod 12, open the centering clamping position, string the torsion spring on the center positioning shaft 20, and place the lower force arm at the centering clamping position. Release the force applied to the centering pressure rod 20 to achieve the centering clamping, read the scale value of the circular dial pointed to by the upper force arm of the torsion spring, and then achieve repeated measurement.

[0105] When it is only necessary to determine whether the torsion spring angle meets the angle range, the lower slider assembly and the upper slider assembly can be rotated so that the scales indicated by the slide ruler 06 are the upper and lower limit scales of the measured angle respectively, and the butterfly screw 10 is tightened to fix the positions of the lower slider assembly and the upper slider assembly. At this time, the allowable angle range of the measured torsion spring is formed between the upper and lower slider assemblies.

[0106] When conducting a torsion spring angle acceptance test, it is only necessary to select and replace the appropriate center positioning shaft 20, adjust the moving pressure rods 12 on both sides to obtain the appropriate height of the upper force arm of the torsion spring, and make it close to the dial position; after completing the above settings, press the centering pressure rod 12, open the centering clamping position, string the torsion spring on the center positioning shaft 20, and at the same time place the lower force arm at the centering clamping position, release the force applied to the centering pressure rod 12, and realize the centering clamping. It is only necessary to determine whether the upper force arm of the torsion spring being tested is between the upper and lower slider assemblies (set upper and lower limit ranges); when it is between the upper and lower slider assemblies, it is qualified; when it is not between the upper and lower slider assemblies, it is unqualified; through the above process, it is possible to judge whether the torsion spring angle is qualified and realize rapid batch testing.

[0107] The tooling involved in this embodiment has a simple and compact structure, low processing and manufacturing costs, convenient measurement and operation, accurate measurement results, and good versatility and applicability of torsion spring structures; it has the measurement function of special angle sample blocks and the actual measurement function of any angle value; it reduces the number of processing and manufacturing torsion spring angle blocks, reduces the cost of using measuring tools, and also reduces the cycle for making special measuring tools; it meets the current technical requirements for 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 invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

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, one end of which is provided with a scale boss, an upper slider assembly and a lower slider assembly are slidably arranged on the scale boss, and a lateral elliptical ring groove a, a lateral elliptical ring groove b, a lateral elliptical ring groove c and a lateral elliptical ring groove d are arranged on the outer cylindrical surface; the inner body is arranged in the hole of the outer body and slides with the outer body, and two relative motion pressure rods are arranged on the outer cylindrical surface of the inner body, and the motion pressure rod slides with the lateral elliptical ring groove a and the lateral elliptical ring groove c relative to the outer body, and 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, one end of which is connected with the centering pressure rod, the centering pressure rod passes through the outer body and slides with the lateral elliptical ring groove d, and the other end of the displacement block is connected with the second reset spring The left and right centering blocks are in contact with the spring, and the second return spring is limited by the second positioning baffle plate arranged at one end of the displacement slide. The left and right centering blocks 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 and right centering blocks are symmetrically arranged on the centering slide of the inner main body, and the cylinders of the left and right centering blocks 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 and right centering blocks to move toward each other in the V-shaped slide, and releasing the centering pressure rod, the second return spring pushes the displacement block to slide in the displacement slide, driving the cylinders of the left and right centering blocks 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 is 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 is 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 arranged 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 angle measuring tool for 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 ruler, a butterfly screw and a first positioning baffle, the first positioning baffle is fixed to the bottom of the upper slider by screws, the first positioning baffle and the upper slider form a sliding groove that slidably cooperates with the scale boss on the outer body, an elliptical boss is arranged on the top end face of the upper slider, the elliptical boss cooperates with the elliptical groove on the slide ruler, a threaded hole is arranged in the center of the elliptical boss, which cooperates with the thread of the clamping screw to fix the slide ruler in the axial direction.

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

7. A method for detecting the angle of a center arm torsion spring, using the detection measuring tool as described in 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 conformity; The quantitative detection method of torsion spring angle is: First, according to the different working circle inner diameters of the torsion spring, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve the applicability of different working circle inner diameters, and use the inner diameter hole of the torsion spring to be measured and the center positioning shaft to fix and position, so that the axis of the working circle of the torsion spring coincides with the center positioning shaft; Secondly, by pressing the centering pressure rod in the centering assembly, the displacement block is pushed to move toward the side of the limit baffle in the displacement slideway, 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, placing the lower side force arm of the torsion spring to be measured on the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block is pushed to move toward the side of the centering pressure rod in the displacement slideway under the action of the second reset spring force, 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 side force arm of the torsion spring to be measured on the centering clamping position, and realizing the alignment of the lower side 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 to make it close to the height of the scale boss, so as to accurately read 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 working circle inner diameters of the torsion spring, select the appropriate center positioning shaft diameter, insert the center positioning shaft into the center positioning hole on the inner body to achieve the applicability of different working circle inner diameters, and use the inner diameter hole of the torsion spring to be measured and the center positioning shaft to fix and position, so that the axis of the working circle of the torsion spring coincides with the center positioning shaft; Secondly, by pressing the centering pressure rod in the centering assembly, the displacement block is pushed to move toward the side of the second positioning baffle in the displacement slideway, 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, placing the lower side force arm of the torsion spring to be measured on the centering clamping position, removing the external force applied to the centering pressure rod, and the displacement block is pushed to move toward the side of the centering pressure rod in the displacement slideway under the action of the second return spring force, 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 side force arm of the torsion spring to be measured on the centering clamping position, and realizing the alignment of the lower side force arm of the torsion spring to the scale 0; Next, 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 torsion spring angle to be measured, and lock the butterfly nut, rotate the lower slider assembly to the lower limit angle value of the torsion spring angle to be measured, and lock 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 pressure rods on both sides to adjust the upper and lower height positions of the force arm on the torsion spring to make it close to the plane height where the slide ruler is located, so as to judge 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 to 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 the upper force arm of the torsion spring is within the angle range between the two slider assemblies, it is considered qualified. When the measurement is completed, press the centering pressure rod, 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: When repeatedly measuring other torsion spring angle values, 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, read the scale value of the circular dial pointed to by the upper force arm of the torsion spring, and then 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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