Static torque measuring device

Abstract

This invention discloses a static magnetic torque measuring device, comprising: a base; an adjusting mechanism including a clamping unit for positioning an outer magnetic rotor and a mounting plate for mounting a mandrel, detachably connected to the base; the clamping unit and the mounting plate are distributed along the Y-direction and their Y-direction centerlines coincide; a mandrel rotatably mounted on the mounting plate and extending out of the mounting plate along the Y-direction, with one end of the mandrel facing the clamping unit connected to an inner magnetic rotor along the Y-direction, and the other end connected to a lever; and a lever extending along the X-direction, with a weight connected to one end of the lever along the X-direction. This invention can quickly and accurately measure static magnetic torque.

Description

Technical Field

[0001] This utility model belongs to the fields of magnetic pumps and magnetic transmission technology, and particularly relates to a static magnetic torque measuring device. Background Technology

[0002] Currently, magnetic pumps or magnetic couplings generally employ push-pull magnetic circuit designs for their internal and external magnetic rotors. The design methods and bases vary, and the empirical coefficients differ significantly between these methods. To ensure reliable torque transmission, relatively conservative empirical coefficients are often used. This often results in a situation where the torque output is too large for the pump's needs. The internal and external magnetic rotors of a magnetic pump are separated by an isolation sleeve. The materials used for this sleeve are diverse, with austenitic stainless steel and titanium being the most common materials in the chemical industry. When metal cuts magnetic lines of force, eddy currents occur, causing the isolation sleeve to heat up and resulting in eddy current losses. These losses are directly proportional to the static magnetic torque of the internal and external magnetic rotors and inversely proportional to the permeability of the isolation sleeve material. Therefore, optimizing the static magnetic torque of the internal and external magnetic rotors is a feasible solution to reduce eddy current losses, making accurate measurement of these torques crucial. Summary of the Invention

[0003] The purpose of this invention is to provide a magnetic static torque measuring device that can quickly and accurately measure magnetic static torque. The technical solution adopted is as follows: A magnetic static torque measuring device, comprising: Base 1; The adjustment mechanism 2 includes a clamping unit 21 for positioning the external magnetic rotor 13 and a mounting plate 22 for mounting the spindle 3, which is detachably connected to the base 1; the clamping unit 21 and the mounting plate 22 are distributed along the Y direction and their Y-direction center lines coincide. The spindle 3 is rotatably mounted on the mounting plate 22 and extends out of the mounting plate 22 along the Y direction. Along the Y direction, one end of it facing the clamping unit 21 is connected to the inner magnetic rotor 12, and the other end is connected to the lever 4. The lever 4 extends along the X direction, and a weight 10 is connected to one end of the lever along the X direction.

[0004] Preferably, the rear section 33 of the mandrel 3 is connected to the inner magnetic rotor 12 by a key.

[0005] Preferably, the clamping unit 21 is a three-jaw chuck, which is used to clamp the handle 1331 of the external magnetic rotor 13.

[0006] Preferably, the adjustment mechanism 2 includes: The frame 20 is integrally formed with the mounting plate 22 and is detachably connected to the clamping unit 21.

[0007] Preferably, the upper surface of the mounting plate 22 is provided with a mounting groove 221, and the center line of the mounting groove in the Y direction coincides with the center line of the clamping unit 21 in the Y direction 221. The mounting groove 221 is interference-fitted with the bearing 5, and the inner ring of the bearing 5 is either transition-fitted or interference-fitted with the middle section shaft 32 of the spindle 3.

[0008] Preferably, it further includes a pressure plate 7 that contacts the outer ring of the bearing 5 and is connected to the mounting plate 22 by a hexagonal head bolt 8.

[0009] Preferably, the front section 31 of the spindle 3 has a mounting hole for the lever 4 to pass through, the mounting hole extends through the front section 31 in the X direction, and the lever 4 is fixed to the front section 31 by a screw 9.

[0010] Preferably, a lifting eye screw 14 is connected to the lever 4, and the lifting eye screw 14 is connected to a weight 10 via a hook.

[0011] Preferably, the spindle 3 is equipped with an angular displacement sensor.

[0012] A method for measuring magnetic static torque, based on the aforementioned magnetic static torque measuring device, includes the following steps: Apply weight 10 to lever 4, and obtain the angular displacement of spindle 3 after lever 4 comes to rest; Then, by combining the weight M of the weight and the X-direction distance L between the connection point A of the weight 10 on the lever 4 and the spindle 3, the static magnetic torque corresponding to each angular displacement can be obtained.

[0013] Compared with the prior art, the advantages of this utility model are: It can quickly and accurately measure the static magnetic torque corresponding to any angular displacement. Specifically: apply weight 10 to lever 4, and obtain the angular displacement of spindle 3 after lever 4 comes to rest; then, by combining the weight M of the weight and the X-direction distance L between the connection point A of weight 10 on lever 4 and spindle 3, the static magnetic torque corresponding to each angular displacement can be obtained. Attached Figure Description

[0014] Figures 1-2 A three-dimensional view of the magnetic torque measuring device; Figure 3 This diagram illustrates the installation method of the bearing and adjustment mechanism. Figure 4 A three-dimensional view of the adjustment mechanism; Figure 5 This is a structural diagram of the mounting slot; Figure 6 A 3D view showing the device with an internal magnetic rotor and an external magnetic rotor installed. Figure 7 This is a diagram showing the combination of the internal magnetic rotor and the spindle; Figure 8 This is a three-dimensional view of the external magnetic rotor; Figure 9 This is a schematic diagram showing the fit between the limiting ring four and the housing; Figure 10 This is a three-dimensional view of the shell; Figure 11 This is a three-dimensional view of the internal magnetic rotor; Figure 12 This is a 3D view of the eye bolt; Figure 13 The diagram shows the state of the inner and outer magnetic rotors at their initial positions. Figure 14 This is a diagram showing the state of the internal magnetic rotor after it has rotated clockwise.

[0015] Among them, 1-base, 2-Adjustment mechanism, 20-Frame, 21-Clamping unit, 22-Mounting plate, 221-Mounting slot, 3-Mandrel, 31-Front section shaft, 32-Middle section shaft, 33-Rear section shaft 4-Lever, 5-Bearing, 6-Eyebolt, 7-Pressure plate, 8-Hex head bolt, 9-Screw, 10-Weight. 11-Lower bolt, 12-Inner magnetic rotor, 120-Inner magnetic pole, 121-Limiting ring one, 122-Limiting ring two 13-External magnetic rotor, 130-External magnetic pole, 131-Limiting ring three, 132-Limiting ring four, 133-Housing, 1331-Handle 14-Eye bolt. Detailed Implementation

[0016] The static magnetic torque measuring device of this utility model will now be described in more detail with reference to the schematic diagrams, which illustrate preferred embodiments of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model.

[0017] like Figures 1-14 A magnetic static torque measuring device, comprising: Base 1; The adjustment mechanism 2 includes a clamping unit 21 for positioning the external magnetic rotor 13 and a mounting plate 22 for mounting the spindle 3, which is detachably connected to the base 1; the clamping unit 21 and the mounting plate 22 are distributed along the Y direction and their Y-direction center lines coincide. The spindle 3 is rotatably mounted on the mounting plate 22 and extends out of the mounting plate 22 along the Y direction. Along the Y direction, one end of the spindle facing the clamping unit 21 is connected to the inner magnetic rotor 12, and the other end is connected to the lever 4. Lever 4 extends along the X direction, and one end of it along the X direction is connected to weight 10.

[0018] like Figure 3 As shown, the adjustment mechanism 2 includes: The frame 20 is integrally formed with the mounting plate 22 and is detachably connected to the clamping unit 21.

[0019] The upper surface of the mounting plate 22 is provided with a mounting groove 221, and the center line of the mounting groove in the Y direction coincides with the center line of the clamping unit 21 in the Y direction 221. like Figure 3 As shown, the mounting groove 221 is interference-fitted with the bearing 5, and the inner ring of the bearing 5 is interference-fitted or clearance-fitted with the middle section shaft 32 of the spindle 3.

[0020] The pressure plate 7 contacts the outer ring of the bearing 5 (angular contact ball bearing), and is connected to the mounting plate 22 by hexagonal head bolts 8.

[0021] The frame 20 is connected to the base 1 by the lower bolt 11.

[0022] like Figures 1-2 As shown, after the frame 20 is pushed into the base 1 along the Y direction, the lower bolt 11 passes through the lower end face of the frame 20 and abuts against the lower end face of the base 1.

[0023] like Figure 7 As shown, the spindle 3 includes a front section spindle 31, a middle section spindle 32 and a rear section spindle 33 connected in sequence, and the three sections are integrally formed.

[0024] The limiting ring 121 and the limiting ring 22 are currently made of austenitic stainless steel, mainly to ensure that the magnet is protected from corrosion by the medium after subsequent welding to form a closed cavity. Of course, other materials can also be used. If it is integrally injection molded, it can be F46, etc.

[0025] The front section shaft 131, the middle section shaft 132, and the rear section shaft 133 are also made of austenitic stainless steel, which serves to protect the magnets. Generally, low conductivity and high resistivity are required, and austenitic stainless steel is a compromise solution.

[0026] The front section 31 of the spindle 3 has a mounting hole for the lever 4 to pass through. The mounting hole extends through the front section 31 along the X direction. The lever 4 is fixed to the front section 31 by a screw 9. Figure 2 As shown.

[0027] The rear section 33 of the spindle 3 is keyed to the inner magnetic rotor 12, such as... Figure 7 As shown.

[0028] The middle section 32 of the spindle 3 transitions into the inner ring of the bearing 5, such as... Figure 2 As shown.

[0029] The clamping unit 21 is a three-jaw chuck, which is used to clamp the handle 1331 of the external magnetic rotor 13, such as... Figure 6 As shown.

[0030] A lifting eye screw 14 is connected to lever 4. For example... Figure 12 As shown, the eye screw 14 connects to the weight 10 via a hook.

[0031] The lever 4 and its connecting eye screw 14 are symmetrical about the spindle 3 through the central hole. This arrangement can eliminate the influence of the lever's own weight on the measurement results and improve the measurement accuracy.

[0032] Specifically: the eye screw 14 is threadedly connected to the lever 4, the hook is attached to the eye screw 14, and the hook is fixed to the weight 10 as a whole. The hook is a rigid body.

[0033] In addition, an angular displacement sensor is provided on the front section shaft 31 of the spindle 3. According to existing technology, the stator of the angular displacement sensor is fixedly mounted, and the rotor of the angular displacement sensor is rigidly connected coaxially to the front section shaft 31 via a coupling.

[0034] in, Figure 1 The length of the front section shaft 31 is only for illustration purposes. To facilitate the installation of the angular displacement sensor, the front section shaft 31 can be lengthened in the "forward" direction.

[0035] In this implementation, the "forward" direction is the Y direction, and it points from the base 1 to the lever 4.

[0036] In this embodiment, both the inner magnetic rotor 12 and the outer magnetic rotor 13 belong to the prior art.

[0037] like Figure 11 As shown, the internal magnetic rotor 12 includes: m inner magnetic poles 120 are arranged circumferentially and attract each other to form an inner magnetic pole ring. The magnetism of two adjacent inner magnetic poles 120 is opposite, such as... Figures 13-14 As shown.

[0038] Limiting ring 2 122 is embedded in limiting ring 121, and forms a space for installing inner magnetic pole ring between the limiting ring 2 121 and limiting ring 121.

[0039] The limiting ring 121 is keyed to the rear section 33 of the mandrel 3, such as... Figure 7 As shown.

[0040] like Figures 8-10 As shown, the external magnetic rotor 13 includes: m external magnetic poles 130 are arranged circumferentially and attract each other to form an external magnetic pole ring. The magnetic properties of two adjacent external magnetic poles 130 are opposite.

[0041] The outer magnetic pole ring is fitted onto the inner magnetic pole ring, such as Figure 11 As shown.

[0042] Limiting ring 3 131 and limiting ring 4 132 are distributed along the Y direction and form a space for installing the outer magnetic pole ring.

[0043] Limiting ring 4 132 and limiting ring 3 131 are both embedded in the housing 133, with limiting ring 4 132 fitting against the step of the housing 133.

[0044] A handle 1331 is provided at the rear end of the housing 133.

[0045] How to use this static magnetic torque measuring device: Step S1: The base 1 is fixed on the foundation. After the adjustment mechanism 2 is pushed into the base 1, it is locked by the lower bolt 11.

[0046] Step S2: After installing the bearing 5 into the bearing seat position (mounting plate 22) of the adjusting mechanism 2, use the pressure plate 7 to tighten it and adjust the hexagonal head bolt 8.

[0047] Step S3: Install the inner magnetic rotor 12 and the outer magnetic rotor 13.

[0048] Install the inner magnetic rotor 12 onto the spindle 3, and insert the handle 1331 of the outer magnetic rotor 13 into the three-jaw chuck. Then adjust the movable jaws on the three-jaw chuck radially so that the movable jaws clamp the handle 1331.

[0049] The content related to "adjusting the movable jaws on the three-jaw chuck radially" belongs to the prior art.

[0050] Step S4: Install the mandrel 3 onto the adjustment mechanism 2.

[0051] Make a transition fit between one end of the mandrel 3 and the inner ring of the bearing 5, and insert the other end of the mandrel 3 into the lever 4; Connect the center of lever 4 to spindle 3 using screw 9. At each end of the spindle 3, a lifting eye screw 14 is connected at the same relative position, where weights 10 can be added.

[0052] Step S5: Apply a weight 10 to any of the eye screws 14 on the lever 4. Measure the angular displacement of the spindle 3 using the angular displacement sensor. Then, combine the weight M of the weight and the X-direction distance L between the eye screw 14 and the spindle 3 to obtain the static magnetic torque corresponding to each angular displacement between the inner and outer magnetic rotors, including the maximum static magnetic torque.

[0053] According to existing technology: the measured magnetic static torque = M*L.

[0054] like Figure 13 As shown, in the initial position, the central angle 360 / m corresponding to the inner magnetic pole 120 and the outer magnetic pole 130 is the same.

[0055] exist Figure 13 Based on this, the inner magnetic rotor 12 rotates clockwise by 180° to form Figure 14 The state shown.

[0056] Figure 14 At this point, the corresponding magnetic static torque is the maximum magnetic static torque. That is, the magnetic static torque is maximum when the angular displacement is 180° / m.

[0057] Regarding the principle of static magnetic distance measurement: like Figure 1 , Figures 13-14 As shown, after applying a weight 10 of any mass to a lifting screw 14 at the right end of lever 4, the specific movement process is as follows: When lever 4 rotates clockwise, it drives spindle 3 to rotate clockwise, generating static magnetic torque.

[0058] When the static magnetic torque reaches the lever torque M*L, lever 4 comes to rest.

[0059] At this time, the corresponding angular displacement (angle) measured by the angular displacement sensor is the angular displacement corresponding to the static magnetic moment.

[0060] in, Figure 1 The text only indicates the installation position of weight 10 on lever 4, and does not indicate that lever 4 reaches a stationary position after weight 10 is added.

[0061] In other embodiments, a marking method can also be used to determine the angular displacement.

[0062] Specifically: make a straight line mark L0 parallel to the side of the inner magnetic pole 120 on the limiting ring 121, and make a straight line mark L1 parallel to the side of the outer magnetic pole 130 on the housing 133. The final marking effect is similar to Figure 13 .

[0063] Depend on Figure 6 It can be seen that both the straight line marker L0 and the straight line marker L1 can be observed on the 4th side of the lever.

[0064] When the straight line marker L0 rotates to a position between two adjacent straight line markers L1, the corresponding static magnetic torque is at its maximum.

[0065] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A magnetostatic moment measuring device, characterized by include: Base (1); The adjustment mechanism (2) includes a clamping unit (21) for positioning the external magnetic rotor (13) and a mounting plate (22) for mounting the spindle (3), which is detachably connected to the base (1); the clamping unit (21) and the mounting plate (22) are distributed along the Y direction and their Y-direction center lines coincide; The spindle (3) is rotatably mounted on the mounting plate (22) and extends out of the mounting plate (22) along the Y direction. Along the Y direction, one end of the spindle facing the clamping unit (21) is connected to the inner magnetic rotor (12), and the other end is connected to the lever (4). The lever (4) extends along the X direction, and a weight (10) is connected to one end of it along the X direction.

2. The magnetostatic moment measuring device according to claim 1, characterized in that The rear section shaft (33) of the mandrel (3) is connected to the inner magnetic rotor (12) by a key.

3. The magnetostatic moment measuring device according to claim 1, characterized in that The clamping unit (21) is a three-jaw chuck, which is used to clamp the handle (1331) of the external magnetic rotor (13).

4. The magnetostatic moment measuring device according to claim 1, characterized in that The adjustment mechanism (2) includes: The frame (20) is integrally formed with the mounting plate (22) and is detachably connected to the clamping unit (21).

5. The static magnetic torque measuring device according to claim 1, characterized in that, The upper surface of the mounting plate (22) is provided with a mounting groove (221), and the Y-direction center line of the mounting groove (221) coincides with the Y-direction center line of the clamping unit (21); The mounting groove (221) is interference-fitted with the bearing (5), and the inner ring of the bearing (5) is transition-fitted with the middle section shaft (32) of the spindle (3).

6. The magnetostatic torque measuring device according to claim 5, characterized in that, It further includes a pressure plate (7) that contacts the outer ring of the bearing (5) and is connected to the mounting plate (22) by a hexagonal head bolt (8).

7. The static magnetic torque measuring device according to claim 1, characterized in that, The front section (31) of the spindle (3) has a mounting hole for the lever (4) to pass through, the mounting hole extending through the front section (31) in the X direction, and the lever (4) is fixed to the front section (31) by a screw (9).

8. The static magnetic torque measuring device according to claim 1, characterized in that, The lever (4) is connected to a lifting eye screw (14), and the lifting eye screw (14) is connected to a weight (10) via a hook.

9. The static magnetic torque measuring device according to claim 1, characterized in that, An angular displacement sensor is provided on the spindle (3).

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