Arc spring degree-of-freedom angle measuring equipment and measuring process

Abstract

The invention relates to the field of measuring equipment, and discloses arc-shaped spring freedom degree angle measuring equipment and a measuring technology.The arc-shaped spring freedom degree angle measuring equipment comprises a workbench, the workbench is detachably connected with a fixing piece, the fixing piece is in an arc shape, the fixing piece is provided with an arc-shaped mounting groove, and one end of the mounting groove is provided with a limiting pin; a mounting groove is formed in the workbench, a rotating rod is vertically arranged on the workbench, the rotating rod is coaxial with the axis of the mounting groove, a touch rod is horizontally arranged on the rotating rod, the touch rod is detachably connected with the rotating rod, and an angle sensor is arranged on the rotating rod. According to the invention, through the angle sensor, the touch rod is firstly contacted with the standard component, the angle sensor is zeroed, then the standard component is replaced by the to-be-measured spring, the touch rod is contacted with the to-be-measured spring again, the angle displayed by the angle sensor is the angle difference between the to-be-measured spring and the standard component, and the angle difference between the to-be-measured spring and the standard component is calculated through simple addition and subtraction. The spring angle measuring device is simple in structure and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of arc spring detection, and in particular to an arc spring degree of freedom angle measurement device and a measurement process. Background Art

[0002] A dual-mass flywheel (DMF) is a structure used in automotive powertrains, effectively isolating torsional vibrations from the engine crankshaft. The spring assembly within the DMF cavity is typically an arc spring. If the arc spring's angle (radius) does not meet the required specifications, the spring axis will tilt during operation, generating a lateral force component. This can increase component friction or collision, leading to noise and accelerated spring wear at best. In severe cases, this can cause the vehicle's transmission to swerve or the body to lose control. The end faces of the arc spring should be perpendicular to the axis. If not, this will affect the spring's load and cause it to tilt. Therefore, the spring's end faces must be tested for perpendicularity. Furthermore, to ensure that the arc spring deforms along its axis, each spring turn should be distributed along the axis, effectively testing the spring's planar alignment.

[0003] In the prior art, when testing the planar fit of arc spring turns, the arc spring is placed flat on a plane and visually observed to see whether each turn of the spring is in contact with the plane, or a thin sheet is inserted underneath to see whether the arc spring is displaced during the insertion of the sheet. These methods are not accurate enough and cannot quantify the planar fit of each turn of the arc spring, which is not conducive to quality control management during the production process.

[0004] The invention patent with publication number CN113624104B discloses a device for detecting the angle and verticality of an arc spring. When performing angle detection, first install the limit pin into the positioning hole, then pull the pull rod to allow the clamp to retreat, and place the standard part into the arc spring accommodation space between the spring seat and the clamp. The left end of the standard part abuts against the limit pin, and the rotating table is rotated clockwise to bring the standard part close to the angle detection part. The second hand wheel is turned to adjust the position of the angle detection part and the standard part. After the angle detection part and the end face of the standard part are firmly aligned, the second slide rail seat and the rotating table are fixed. The dial indicator is cleared, the standard part is removed, and the arc spring to be tested is clamped again using the clamp. The reading is taken from the dial indicator and converted into an angle according to the comparison table to complete the test. When this structure and method are used, when the arc spring is placed on a rotating table for rotation, the arc spring may be displaced during the rotation, affecting the measurement results. It is also difficult to determine with the naked eye whether the angle detection part and the end face of the arc spring are exactly aligned. If there are burrs on the end of the arc spring, the measured angle will be too large. Summary of the Invention

[0005] The purpose of the present invention is to provide an arc spring degree of freedom angle measurement device and measurement process, aiming to solve the problem of inaccurate angle measurement of arc springs in the prior art.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A device for measuring the degree of freedom angle of an arc spring comprises a workbench, to which a fixing piece is detachably connected, the fixing piece being in an arc shape, the fixing piece being provided with an arc-shaped mounting groove, a limit pin being provided at one end of the mounting groove, a rotating rod being vertically arranged on the workbench, the rotating rod being coaxial with the axis of the mounting groove, a touch rod being horizontally arranged on the rotating rod, the touch rod being detachably connected to the rotating rod, and an angle sensor being provided on the rotating rod.

[0007] Through the above technical solution, first put the standard part into the installation slot, put one end against the limit pin, rotate the touch rod, and the rotating rod rotates at the same time. After the touch rod contacts the end face of the standard part, the reading of the angle sensor is reset to zero. Then put the spring to be tested into the installation slot, rotate the touch rod, and after the touch rod contacts the end face of the spring to be tested, The present invention is further configured as follows: a measuring piece is provided on the fixing piece, a touch plate is vertically provided at one end of the touch rod, the touch plate is rotatably connected to the touch rod, a locking mechanism for locking the position of the touch plate is provided on the touch rod, a current sensor is provided on the measuring piece, a first power supply is connected to the current sensor, and the measuring piece, the current sensor, the first power supply and the touch plate are connected in sequence through a circuit.

[0008] Through the above technical solution, when the touch plate is completely in contact with the end face of the standard part, a current path is formed between the standard part, the first power supply, the current sensor, and the measuring part, and the current sensor displays a value; when the touch plate contacts the end of the spring to be measured, if the current becomes significantly smaller, it means that the resistance increases, further indicating that the contact area between the touch plate and the spring to be measured becomes smaller, that is, the end face of the spring to be measured and the touch plate are not completely in contact, the end face of the spring to be measured may have burrs, or the end face of the spring to be measured is tilted, the verticality does not meet the standard, and quality processing is required, and angle measurement and calculation are not necessary; if the current does not change much, it means that the contact area between the touch plate and the spring to be measured is normal, the rotation angle of the touch rod is in place, and angle measurement and calculation can be performed.

[0009] The present invention is further configured as follows: a positioning screw hole is formed at one end of the touch rod away from the touch plate, and a positioning bolt is provided through the positioning screw hole.

[0010] Through the above technical solution, after the touch rod is rotated into position, the positioning bolt is rotated downward, and the end of the positioning bolt contacts the surface of the workbench to fix the position of the touch rod. In order to increase friction, the end of the positioning bolt can be provided with anti-slip rubber. After the position of the touch rod is fixed, the touch plate and the limit pin limit the spring to be measured from both ends to prevent the spring to be measured from displacement when the measuring piece moves.

[0011] The present invention is further configured as follows: a sliding groove is provided on the side wall of the fixing member, a sliding block matching the sliding groove is provided on the measuring member, two movable rods are vertically provided on the measuring member, a limiting plate is provided on the movable rod, a first spring is sleeved on the movable rod, one end of the first spring is connected to the limiting plate, and the other end is connected to the measuring member, a rotating roller is provided between the two movable rods, and a displacement sensor for measuring the displacement of the movable rod is provided on the measuring member.

[0012] Through the above technical solution, the measuring piece moves forward along the direction of the sliding groove, and the rotating roller is always pressed against the surface of the arc spring and moves up and down on the surface of the arc spring. The displacement sensor can record the up and down movement positions of the rotating roller and the movable rod. When the arc spring is of qualified quality, the up and down movement distance of the rotating roller and the movable rod should change periodically. If there is a value that is too high or too low, it means that the corresponding height position of the coil at that location is too high or too low. When the deviation value exceeds the set range, it can be determined that the product is of unqualified quality. At the same time, since a circuit path is formed among the measuring piece, the current sensor, the first power supply, the touch plate, and the spring to be measured, as the measuring piece continues to move, it is equivalent to the resistance of the spring to be measured continuously decreasing, and the current should gradually increase. The data recorded by the current sensor can be used to match the coil position of the arc spring one by one. When the coil height position detection is unqualified, the corresponding spring coil position can be found by matching it with the current value recorded by the current sensor.

[0013] The present invention is further configured as follows: the locking mechanism includes a connecting rod arranged at the end of the touch rod, a plurality of adjustment rings are sleeved on the connecting rod, the adjustment ring is fixedly connected to one side of the touch plate, an adjustment threaded hole is opened on the adjustment ring, and an adjustment bolt is arranged through the adjustment threaded hole.

[0014] With the above technical solution, the angle of the touch panel can be adjusted by loosening the adjusting bolt and rotating the adjusting ring on the connecting rod. The adjusting bolt is tightened and the end of the adjusting bolt is pressed against the connecting rod to complete the locking of the touch panel position.

[0015] The present invention is further configured as follows: two clamping plates are provided on the rotating rod, a clamping groove is formed between the two clamping plates, the clamping groove cooperates with the touch rod, a fastening threaded hole is opened on the clamping plate, and a fastening bolt is provided through the fastening threaded hole.

[0016] Through the above technical solution, by loosening the fastening bolts, the position of the touch rod between the clamping grooves can be adjusted, and the position of the end of the touch rod can be adjusted to adapt to the detection of arc springs with different curvatures and lengths.

[0017] The present invention is further configured as follows: a connecting plate is provided on the fixing member, a plurality of through holes are opened on the connecting plate, a plurality of connecting threaded holes are opened on the surface of the workbench, connecting bolts are provided through the through holes, and one end of the connecting bolt passes through the through hole and is connected to the connecting threaded hole.

[0018] Through the above technical solution, the connecting bolt is passed through the through hole and connected to the connecting threaded hole to complete the installation of the fixing part. Conversely, the fixing part can be disassembled. The disassembly and installation are convenient, which is conducive to the replacement of the fixing part. For arc springs of different curvatures and sizes, the corresponding fixing part should be replaced. When installing the fixing part, it is necessary to ensure that the axis of the installation groove coincides with the axis of the rotating shaft.

[0019] It should be understood that the devices and principles used to convert the measurement electrical signals of the angle sensor, current sensor, and displacement sensor into digital display and recording are common technologies in this field and will not be elaborated on here.

[0020] An arc spring degree of freedom angle measurement device is characterized by comprising the following steps: S1. Place the standard part in the installation slot, place one end of the standard part against the limit pin, and move the touch rod. The touch rod and the rotating rod rotate together, gradually bringing one end of the touch rod and one end of the standard part closer together. Adjust the direction of the touch plate so that one side of the touch plate is in contact with the end face of the standard part. Lock the position of the touch plate. Move the measuring piece above the standard part and make contact with one end of the standard part. The measuring piece and the standard part are in contact. The current sensor displays a reading, which is recorded. The touch plate is in contact with the end face of the standard part. The angle sensor also displays a reading at this time. Reset the angle sensor to zero. S2. Move the touch rod away from the mounting slot, remove the standard part, place the spring to be tested into the mounting slot, and observe whether the spring to be tested fits the inner wall of the mounting slot. Make one end of the spring to be tested contact the limit pin. Move the rotating rod to rotate the touch rod toward the mounting slot. The touch plate contacts the end face of the spring to be tested. Move the measuring piece above the spring to be tested and contact one end of the spring to be tested. The current sensor will display the reading. S3. Compare the reading measured in S2 with the reading recorded in S1. If the reading difference is large, the end of the spring to be tested is not completely in contact with the touch plate, indicating that there are burrs or tilt on the end surface of the spring to be tested, and the spring needs to be removed for treatment. If the reading difference is within the set range, it proves that the touch plate and the end surface of the spring to be tested are in contact. At this time, the reading displayed by the angle sensor is the angle difference between the spring to be tested and the standard part. The angle of the spring to be tested can be obtained by calculation. S4. Tighten the positioning bolt, so that the end of the positioning bolt is in close contact with the surface of the workbench, fixing the position of the touch rod, and then push the measuring piece. The measuring piece moves along the sliding groove toward the touch plate. Under the action of the first spring, the rotating roller always fits with the top of the spring to be measured. As the measuring piece moves, the rotating roller moves up and down on the top of the spring to be measured, and the movable rod moves up and down along with it. The displacement sensor records the up and down position of the movable rod. As the measuring piece moves, the current recorded by the current sensor gradually increases. The current reading corresponds to the corresponding turn of the spring to be measured, and the reading of the displacement sensor corresponds to the height of the turn. When the displacement sensor has an abnormal reading, it means that the height position of the turn of the spring to be measured is abnormal. Combined with the degree recorded by the current sensor, the position of the turn with abnormal height can be located.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a rotating rod and an angle sensor. First, the touch rod and the rotating rod are rotated to the end of the standard part, the angle sensor is reset, and then the standard part is replaced with the spring to be tested. The touch rod and the rotating rod are rotated again. When the end face of the touch rod and the end face of the spring to be tested come into contact, the angle displayed by the angle sensor is the angle difference between the spring to be tested and the standard part. The angle of the spring to be tested can be obtained by simple addition and subtraction. The structure is simple and the operation is convenient. After the spring to be tested is placed, only the touch rod needs to be rotated. The spring to be tested is always in a stationary state, and the test result is more accurate.

[0022] 2. The present invention forms a circuit path among the measuring piece, the current sensor, the first power supply, the touch plate, and the spring to be tested by setting a current sensor and a touch plate. The current displayed by the current sensor can be used to determine whether the end face of the spring to be tested and the touch plate are completely fitted together. If the fitting is not complete, it means that the end face of the spring to be tested may have burrs, or the end face of the spring to be tested is tilted, and the verticality does not meet the standard, and quality processing is required.

[0023] 3. The present invention is provided with a movable rod, a rotating roller and a displacement sensor, and the displacement of the card on the movable rod is used to quickly detect whether the height of the spring coil is qualified; 4. Since a circuit path is formed between the measuring piece, the current sensor, the first power supply, the touch panel, and the spring to be measured, as the measuring piece continues to move on the top of the spring to be measured, the resistance of the spring to be measured is equivalent to continuously decreasing, and the current should gradually increase. The data recorded by the current sensor can be used to match the positions of the turns of the arc spring one by one. When the height position detection of the turn fails, the current value recorded by the current sensor can be used to match and find the corresponding spring turn position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of a first embodiment of an arc spring degree of freedom angle measurement device according to the present invention; Figure 2 This is a partial structural diagram of a first embodiment of an arc spring degree of freedom angle measurement device according to the present invention; Figure 3 This is a schematic diagram of the overall structure of a second embodiment of an arc spring degree of freedom angle measurement device according to the present invention; Figure 4 This is a schematic diagram of the connection structure of the touch rod and the touch plate in the second embodiment of the arc spring degree of freedom angle measurement device of the present invention; Figure 5 This is a schematic structural diagram of a measuring component in a second embodiment of an arc spring degree of freedom angle measuring device according to the present invention; Figure 6 This is a cross-sectional view of a measuring member in a second embodiment of an arc spring degree of freedom angle measuring device of the present invention; Figure 7 This is a schematic diagram of the connection structure between the fixing member and the workbench in the second embodiment of the arc spring degree of freedom angle measurement device of the present invention; Figure 8 This is a circuit connection diagram of a second embodiment of an arc spring degree of freedom angle measurement device of the present invention.

[0026] In the figure, 1. workbench; 1a. connecting threaded hole; 2. fixing part; 2a. mounting groove; 2b. limit pin; 2c. sliding groove; 3. rotating rod; 4. touch rod; 4a. positioning screw hole; 4b. positioning bolt; 5. angle sensor; 6. measuring part; 6a. sliding block; 6b. movable rod; 6c. limit plate; 6d. first spring; 6e. rotating roller; 6f. displacement sensor; 7. touch plate; 8. locking mechanism; 8a. connecting rod; 8b. adjusting ring; 8b1. adjusting threaded hole; 8b2. adjusting bolt; 9. current sensor; 10. first power supply; 11. clamping plate; 11a. clamping groove; 11b. fastening threaded hole; 11c. fastening bolt; 12. connecting plate; 12a. through hole; 12b. connecting bolt. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0028] Example 1:

[0029] The present invention provides an arc spring degree of freedom angle measurement device, such as Figure 1 and Figure 2 As shown, it includes a workbench 1, to which a fixing part 2 is detachably connected, the fixing part 2 is arc-shaped, and an arc-shaped installation groove 2a is provided on the fixing part 2, and a limiting pin 2b is provided at one end of the installation groove 2a. A rotating rod 3 is vertically arranged on the workbench 1, and the rotating rod 3 is coaxial with the axis of the installation groove 2a. A touch rod 4 is horizontally arranged on the rotating rod 3, and the touch rod 4 is detachably connected to the rotating rod 3. An angle sensor 5 is provided on the rotating rod 3.

[0030] A process for measuring the degree of freedom angle of an arc spring comprises the following steps: S1. Place the standard component into the installation slot 2a, place one end of the standard component against the limit pin 2b, and move the touch rod 4. The touch rod 4 and the rotating rod 3 rotate together. One end of the touch rod 4 contacts the end face of the standard component. At this time, the angle sensor 5 also displays a reading. Reset the angle sensor 5 to zero. S2. Move the touch rod 4 away from the installation groove 2a, take out the standard part, put the spring to be tested into the installation groove 2a, observe whether the spring to be tested fits the inner wall of the installation groove 2a, make one end of the spring to be tested contact with the limit pin 2b, move the rotating rod 3, rotate the touch rod 4 in the direction of the installation groove 2a, and make the touch rod 4 contact with the end face of the spring to be tested. At this time, the reading displayed by the angle sensor 5 is the angle difference between the spring to be tested and the standard part. The angle of the spring to be tested can be obtained by calculation.

[0031] This technical solution uses the angle sensor 5 to detect the angle difference between the standard part and the spring to be tested, and then obtains the angle of the spring to be tested through simple addition and subtraction calculations. It has a simple structure and is easy to operate. After inserting the spring to be tested, it is only necessary to rotate the touch rod 4. The spring to be tested is always in a stationary state, and the test result is more accurate.

[0032] Example 2:

[0033] Different from the first embodiment, Figure 3 and Figure 4 As shown, a measuring piece 6 is provided on the fixing piece 2, and a touch plate 7 is vertically provided at one end of the touch rod 4. A positioning screw hole 4a is provided at the end of the touch rod 4 away from the touch plate 7, and a positioning bolt 4b is provided through the positioning screw hole 4a. The touch plate 7 is rotatably connected to the touch rod 4, and a locking mechanism 8 for locking the position of the touch plate 7 is provided on the touch rod 4. The locking mechanism 8 includes a connecting rod 8a provided at the end of the touch rod 4, and a plurality of adjusting rings 8b are sleeved on the connecting rod 8a. The adjusting ring 8b is fixedly connected to one side of the touch plate 7, and an adjusting threaded hole 8b1 is provided on the adjusting ring 8b, and an adjusting bolt 8b2 is provided through the adjusting threaded hole 8b1. A current sensor 9 is provided on the measuring piece 6, and the current sensor 9 is connected to a first power supply 10. The measuring piece 6, the current sensor 9, the first power supply 10 and the touch plate 7 are connected in sequence through a circuit.

[0034] Two clamping plates 11 are provided on the rotating rod 3, and a clamping groove 11a is formed between the two clamping plates 11. The clamping groove 11a cooperates with the touch rod 4. A fastening threaded hole 11b is opened on the clamping plate 11, and a fastening bolt 11c is provided through the fastening threaded hole 11b.

[0035] like Figure 5 and Figure 6As shown, a sliding groove 2c is provided on the side wall of the fixing member 2, and a sliding block 6a that cooperates with the sliding groove 2c is provided on the measuring member 6. Two movable rods 6b are vertically provided on the measuring member 6, and a limiting plate 6c is provided on the movable rod 6b. A first spring 6d is sleeved on the movable rod 6b, and one end of the first spring 6d is connected to the limiting plate 6c, and the other end is connected to the measuring member 6. A rotating roller 6e is provided between the two movable rods 6b, and a displacement sensor 6f for measuring the displacement of the movable rod 6b is provided on the measuring member 6.

[0036] like Figure 7 As shown, a connecting plate 12 is provided on the fixing member 2, and a plurality of through holes 12a are opened on the connecting plate 12. A plurality of connecting threaded holes 1a are opened on the surface of the workbench 1, and connecting bolts 12b are provided through the through holes 12a. One end of the connecting bolt 12b passes through the through hole 12a and is connected to the connecting threaded hole 1a.

[0037] like Figure 8 As shown, a circuit path is formed among the measuring member 6, the current sensor 9, the first power supply 10, the touch panel 7, and the spring to be measured.

[0038] A process for measuring the degree of freedom angle of an arc spring comprises the following steps: S1. Place the standard component into the installation slot 2a, place one end of the standard component against the limit pin 2b, and move the touch rod 4. The touch rod 4 and the rotating rod 3 rotate together, and one end of the touch rod 4 gradually approaches one end of the standard component. Adjust the direction of the touch plate 7 so that one side of the touch plate 7 is in contact with the end face of the standard component. Lock the position of the touch plate 7, move the measuring piece 6 above the standard component, and contact one end of the standard component. The measuring piece 6 and the standard component are in contact. The current sensor 9 displays a reading, and the reading is recorded. The touch plate 7 is in contact with the end face of the standard component. At this time, the angle sensor 5 also displays a reading, and the angle sensor 5 is reset to zero. S2. Move the touch rod 4 away from the mounting groove 2a, remove the standard part, place the spring to be tested into the mounting groove 2a, and observe whether the spring to be tested fits the inner wall of the mounting groove 2a. Make one end of the spring to be tested contact the limit pin 2b. Move the rotating rod 3 to rotate the touch rod 4 toward the mounting groove 2a. The touch plate 7 contacts the end face of the spring to be tested. Move the measuring piece 6 above the spring to be tested and contact one end of the spring to be tested. At this time, the current sensor 9 displays a reading. S3. Compare the reading measured in S2 with the reading recorded in S1. If the reading difference is large, the end of the spring to be tested is not completely in contact with the touch plate 7, indicating that there are burrs or tilt on the end surface of the spring to be tested, and the spring needs to be removed for treatment. If the reading difference is within the set range, it proves that the touch plate 7 is in contact with the end surface of the spring to be tested. At this time, the reading displayed by the angle sensor 5 is the angle difference between the spring to be tested and the standard part. The angle of the spring to be tested can be obtained by calculation. S4. Tighten the positioning bolt 4b, and the end of the positioning bolt 4b is in close contact with the surface of the workbench 1 to fix the position of the touch rod 4. Then push the measuring piece 6, and the measuring piece 6 moves along the sliding groove 2c toward the touch plate 7. The rotating roller 6e is always in contact with the top of the spring to be measured under the action of the first spring 6d. As the measuring piece 6 moves, the rotating roller 6e moves up and down on the top of the spring to be measured, and the movable rod 6b moves up and down with it. The displacement sensor 6f records the up and down position of the movable rod 6b. As the measuring piece 6 moves, the current recorded by the current sensor 9 gradually increases. The current reading corresponds to the corresponding turn of the spring to be measured, and the reading of the displacement sensor 6f corresponds to the height of the turn. When the displacement sensor 6f has an abnormal reading, it means that the height position of the turn of the spring to be measured is abnormal. Combined with the degree recorded by the current sensor 9, the position of the turn with abnormal height can be located.

[0039] The workflow of this technical solution is as follows: Select a standard part and install the matching fixing part 2 on the workbench 1. Then put the standard part into the installation slot 2a, with one end pressed against the limit pin 2b. Then move the touch rod 4, and the touch rod 4 and the rotating rod 3 rotate together until the touch plate 7 contacts the end face of the standard part. Loosen the fastening bolt 11c to adjust the length of the touch rod 4, and then tighten the fastening bolt 11c. Then adjust the angle by adjusting the adjusting bolt 8b2 and rotating the touch plate 7 until the touch plate 7 is completely in contact with the end face of the standard part. Move the measuring part 6 to the end of the standard part close to the limit pin 2b. The current sensor 9 will display a reading. Record the current value, and then reset the angle sensor 5 to zero. After completion, the touch rod 4 and the rotating rod 3 can be moved to the side. Remove the standard component and place the spring to be tested in it. Observe whether the spring to be tested matches the mounting slot 2a to prevent the turns of the spring to be tested from shifting horizontally. Place one end of the spring to be tested against the limit pin 2b. Then move the measuring piece 6 to the end of the spring to be tested close to the limit pin 2b. Then rotate the touch rod 4 and the rotating rod 3 toward the end of the spring to be tested. When the touch plate 7 contacts the end face of the spring to be tested, the current sensor 9 will produce a reading. Compare the reading with the previous reading of the standard component. If the difference is large and exceeds the set range, for example, when there is a burr on the end face of the spring to be tested, only one point of the spring to be tested contacts the touch plate 7, or when the end face of the spring to be tested is not vertical or tilted, only one point or one edge of the spring to be tested contacts the touch plate 7. In both cases, the contact area will drop sharply, the resistance of the spring to be tested in the circuit will increase significantly, and the current will decrease significantly. This is a product quality problem and needs to be removed and handled separately. If the difference is within the set range, it proves that the touch plate 7 is in good contact with the end face of the spring to be tested, and the end face of the spring to be tested is qualified. At this time, the positioning bolt 4b is rotated and screwed downward. The end of the positioning bolt 4b contacts the surface of the workbench 1, and the position of the touch rod 4 and the touch plate 7 is fixed; After the touch panel 7 contacts the end face of the spring to be tested, a value will be displayed on the angle sensor 5. This value is the angle difference between the spring to be tested and the standard part. The angle value of the spring to be tested can be obtained directly by addition and subtraction. When the position of the touch plate 7 is fixed, the touch plate 7 and the limit pin 2b will clamp the spring to be tested from both ends. At this time, the measuring piece 6 is moved from one end to the other. The movable rod 6b and the rotating roller 6e move up and down repeatedly on the top of the spring to be tested. The displacement sensor 6f records the value of the up and down movement of the movable rod 6b. After the measuring piece 6 moves to the end point, the highest point of the movable rod 6b's movement recorded by the displacement sensor 6f should correspond to each turn of the spring to be tested. If any of the recorded values is too high, it proves that the position of the turn is too high and the spring axis has deviated. At the same time, because a circuit path is formed between the measuring member 6, the current sensor 9, the first power source 10, the touch panel 7, and the spring to be tested, as the measuring member 6 continues to move, the resistance provided by the spring to be tested in the circuit continuously decreases, and the current gradually increases. The current change data recorded by the current sensor 9 can be used to match the position of the turns of the arc spring one by one. When the height position detection of the turns fails, the corresponding spring turn position can be found by matching the current value recorded by the current sensor 9. When the measuring member 6 moves forward, it not only detects the height of each turn on the spring to be tested, but the current sensor 9 also changes to locate the position of the measuring member. In this way, if a turn height abnormality is detected, the position of the abnormal turn can be quickly determined.

[0040] In order to achieve the technical effect that the resistance provided by the spring to be measured in the circuit continuously decreases and the current gradually increases when the measuring piece 6 moves, insulation treatment is performed between the measuring piece 6 and the fixed piece 2. The rotating roller 6e on the measuring piece 2 is a conductor and can establish an electrical circuit connection with the coil of the spring to be measured directly below the rotating roller 6e.

[0041] It should be understood that the devices and principles for converting the measurement electrical signals of the angle sensor 5, the current sensor 9, and the displacement sensor 6f into digital display and recording are common technologies in this field and will not be elaborated on here.

[0042] The ends of the positioning bolt 4b, the adjusting bolt 8b2 and the fastening bolt 11c can be provided with anti-slip rubber to enhance the fixing effect.

[0043] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0044] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An arc spring degree of freedom angle measurement device, characterized by: The invention comprises a workbench (1), wherein a fixing member (2) is detachably connected to the workbench (1), wherein the fixing member (2) is in an arc shape, wherein the fixing member (2) is provided with an arc-shaped mounting groove (2a), wherein one end of the mounting groove (2a) is provided with a limiting pin (2b), wherein a rotating rod (3) is vertically provided on the workbench (1), wherein the rotating rod (3) is coaxial with the axis of the mounting groove (2a), wherein a touch rod (4) is horizontally provided on the rotating rod (3), wherein the touch rod (4) is detachably connected to the rotating rod (3), and wherein an angle sensor (5) is provided on the rotating rod (3).

2. The arc spring degree of freedom angle measuring device according to claim 1, characterized in that: The fixing member (2) is provided with a measuring member (6), a touch plate (7) is vertically provided at one end of the touch rod (4), the touch plate (7) is rotatably connected to the touch rod (4), the touch rod (4) is provided with a locking mechanism (8) for locking the position of the touch plate (7), the measuring member (6) is provided with a current sensor (9), the current sensor (9) is connected to a first power source (10), and the measuring member (6), the current sensor (9), the first power source (10) and the touch plate (7) are sequentially connected through a circuit.

3. The arc spring degree of freedom angle measuring device according to claim 2, characterized in that: A positioning screw hole (4a) is provided at one end of the touch rod (4) away from the touch plate (7), and a positioning bolt (4b) is provided through the positioning screw hole (4a).

4. The arc spring degree of freedom angle measuring device according to claim 3, characterized in that: A sliding groove (2c) is provided on the side wall of the fixing member (2), a sliding block (6a) matched with the sliding groove (2c) is provided on the measuring member (6), two movable rods (6b) are vertically provided on the measuring member (6), a limiting plate (6c) is provided on the movable rod (6b), a first spring (6d) is sleeved on the movable rod (6b), one end of the first spring (6d) is connected to the limiting plate (6c), and the other end is connected to the measuring member (6), a rotating roller (6e) is provided between the two movable rods (6b), and a displacement sensor (6f) for measuring the displacement of the movable rod (6b) is provided on the measuring member (6).

5. The arc spring degree of freedom angle measuring device according to claim 2, characterized in that: The locking mechanism (8) comprises a connecting rod (8a) arranged at the end of the touch rod (4); a plurality of adjustment rings (8b) are sleeved on the connecting rod (8a); the adjustment rings (8b) are fixedly connected to one side of the touch plate (7); an adjustment threaded hole (8b1) is provided on the adjustment ring (8b); and an adjustment bolt (8b2) is provided through the adjustment threaded hole (8b1).

6. The arc spring degree of freedom angle measuring device according to claim 1, characterized in that: Two clamping plates (11) are provided on the rotating rod (3), a clamping groove (11a) is formed between the two clamping plates (11), the clamping groove (11a) is matched with the touch rod (4), a fastening threaded hole (11b) is opened on the clamping plate (11), and a fastening bolt (11c) is provided through the fastening threaded hole (11b).

7. The arc spring degree of freedom angle measuring device according to claim 1, characterized in that: The fixing member (2) is provided with a connecting plate (12), and a plurality of through holes (12a) are provided on the connecting plate (12). The surface of the workbench (1) is provided with a plurality of connecting threaded holes (1a), and connecting bolts (12b) are provided through the through holes (12a). One end of the connecting bolt (12b) passes through the through holes (12a) and is connected to the connecting threaded holes (1a).

8. A process for measuring the degree of freedom angle of an arc spring, based on the process for measuring the degree of freedom angle of an arc spring according to any one of claims 1 to 7, characterized in that: The steps include: S1. Place the standard part in the installation slot (2a), place one end of the standard part against the limit pin (2b), move the touch rod (4), the touch rod (4) and the rotating rod (3) rotate together, one end of the touch rod (4) gradually approaches one end of the standard part, adjust the direction of the touch plate (7), make one side of the touch plate (7) fit with the end face of the standard part, lock the position of the touch plate (7), move the measuring part (6) above the standard part, contact with one end of the standard part, the measuring part (6) contacts the standard part, the current sensor (9) displays the reading, the reading is recorded, the touch plate (7) is in contact with the end face of the standard part, the angle sensor (5) also displays the reading, and the angle sensor (5) is reset to zero; S2. Move the touch rod (4) to a side away from the installation groove (2a), take out the standard part, put the spring to be tested into the installation groove (2a), observe whether the spring to be tested fits the inner wall of the installation groove (2a), make one end of the spring to be tested contact with the limit pin (2b), move the rotating rod (3), rotate the touch rod (4) in the direction of the installation groove (2a), make the touch plate (7) contact with the end face of the spring to be tested, move the measuring piece (6) to the top of the spring to be tested, and make contact with one end of the spring to be tested. At this time, the current sensor (9) displays the reading; S3. Compare the reading measured in S2 with the reading recorded in S1. If the reading difference is large, the end of the spring to be tested is not completely fitted with the touch plate (7), indicating that there are burrs or end surface tilt problems on the end face of the spring to be tested, and it needs to be removed for processing. If the reading difference is within the set range, it proves that the touch plate (7) and the end face of the spring to be tested are fitted. At this time, the reading displayed by the angle sensor (5) is the angle difference between the spring to be tested and the standard part. The angle of the spring to be tested can be obtained by calculation. S4. Twist the positioning bolt (4b), the end of the positioning bolt (4b) is in close contact with the surface of the workbench (1), fixing the position of the touch rod (4), and then push the measuring piece (6). The measuring piece (6) moves along the sliding groove (2c) toward the touch plate (7). The rotating roller (6e) is always in contact with the top of the spring to be measured under the action of the first spring (6d). As the measuring piece (6) moves, the rotating roller (6e) moves up and down on the top of the spring to be measured, and the movable rod (6b) moves up and down along with it. The displacement sensor (6f) records the position of the movable rod (6b) moving up and down. As the measuring piece (6) moves, the current recorded by the current sensor (9) gradually increases. The current reading corresponds to the corresponding turn of the spring to be measured, and the reading of the displacement sensor (6f) corresponds to the height of the turn. When the displacement sensor (6f) has an abnormal reading, it means that the height position of the turn of the spring to be measured is abnormal. In combination with the degree recorded by the current sensor (9), the position of the turn with abnormal height can be located.

Images