High-power permanent magnet motor angle encoder mounting structure for mine hoisting

Abstract

According to the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting, an angle measuring shaft and a rotating sleeve for installing the angle encoder are in transmission connection through a flat key, so that relative rotation between the angle measuring shaft and the rotating sleeve is prevented; the special-shaped jackscrew is matched with the anti-loosening ring, so that the jackscrew is prevented from loosening and falling off; therefore, the reliability of the connection between the high-power permanent magnet motor for mine hoisting and the external angle encoder is thoroughly solved, and the safe and reliable operation of the high-power permanent magnet motor for mine hoisting is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of high-power permanent magnet motors for mine hoists, specifically to an angle encoder mounting structure for a high-power permanent magnet motor used in mine hoists. Background Technology

[0002] Due to their structure, high-power permanent magnet motors used in mine hoists do not have angle encoders installed on them. However, these motors require precise determination of the rotor's angle relative to the stator to control the stator's rotation and commutation. Therefore, an angle encoder needs to be installed externally on the high-power permanent magnet motor used in mine hoists.

[0003] In the structural design of existing angle encoders such as the SG68-0280 brushless resolver transmitter, the rotating sleeve used to connect with the angle measuring shaft adopts a light hole structure design. The rotating sleeve is provided with three set screw holes. When the rotating sleeve is connected to the angle measuring shaft, the angle measuring shaft is set in the inner hole of the rotating sleeve, and the angle measuring shaft is locked with the three set screws to achieve a fixed connection between the rotating sleeve and the angle measuring shaft. However, during the operation of high-power permanent magnet motors used in mine hoists, frequent braking and forward / reverse switching are required, resulting in significant vibration and impact. This can cause the set screws that fix the rotating sleeve to the angle measuring shaft to loosen or fall off. Once the set screws loosen or fall off, relative rotation will occur between the rotating sleeve and the angle measuring shaft, causing a change in the initial phase angle set by the high-power permanent magnet motor rotor. Consequently, the high-power permanent magnet motor used in mine hoists will malfunction, affecting not only the normal production of mining enterprises but also seriously impacting their safety. Therefore, ensuring the reliability of the connection between the high-power permanent magnet motor used in mine hoists and the external angle encoder, and preventing relative rotation between the rotating sleeve and the angle measuring shaft, is an urgent problem that needs to be solved to ensure the safe and reliable operation of high-power permanent magnet motors used in mine hoists. Utility Model Content

[0004] To overcome the shortcomings in the prior art, this utility model discloses an installation structure for an angle encoder of a high-power permanent magnet motor used in mine hoisting. This structure solves the problem of reliable connection between the angle measuring shaft of the high-power permanent magnet motor used in mine hoisting and the rotating sleeve of the angle encoder, preventing relative rotation between the rotating sleeve and the angle measuring shaft, and ensuring the safe and reliable operation of the high-power permanent magnet motor used in mine hoisting.

[0005] To achieve the aforementioned utility model objective, the present utility model adopts the following technical solution: a mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting, comprising an angle encoder and an angle measuring shaft; a rotating sleeve is rotatably provided in the angle encoder, and a plurality of set screw holes are evenly distributed on the exposed side wall of one side of the rotating sleeve, with set screws engaged in the set screw holes by thread; a connecting shaft head is provided at one end of the angle measuring shaft; the connecting shaft head is disposed in the inner hole of the rotating sleeve, and the connecting shaft head is fixedly connected to the rotating sleeve by the set screws in the set screw holes; a set screw groove is provided on the outer circumference of the connecting shaft head, and the inner end of one set screw extends into the set screw groove, thereby preventing relative rotation between the connecting shaft head and the rotating sleeve by the set screw.

[0006] Preferably, the inner hole of the rotating sleeve is provided with a rotating sleeve keyway; the outer surface of the connecting shaft head is provided with a connecting shaft head keyway; the connecting shaft head is set in the inner hole of the rotating sleeve, and a flat key is provided between the rotating sleeve keyway and the connecting shaft head keyway to prevent relative rotation between the connecting shaft head and the rotating sleeve.

[0007] Furthermore, the set screw adopts an irregular shape, and the exposed end of the irregular shape set screw is provided with a set screw head; an anti-loosening ring is provided on the outer circular surface of the exposed end of the rotating sleeve; the anti-loosening ring includes an anti-loosening ring body, and a number of anti-loosening grooves are provided on one end face of the anti-loosening ring body, and the set screw head of the irregular shape set screw is set in the anti-loosening groove to prevent the irregular shape set screw from loosening during operation.

[0008] Furthermore, the set screw head abuts against the side of the anti-loosening groove; a gap is provided between the anti-loosening ring and the adjacent end face of the angle encoder.

[0009] Furthermore, the anti-loosening ring also includes an axial stop, which prevents the anti-loosening ring from moving along the axis of the rotating sleeve during operation.

[0010] Furthermore, the axial stop is either a magnet or a spring.

[0011] Furthermore, the end of the shaped set screw is provided with a wrench hole.

[0012] Due to the adoption of the above-described technical solution, this utility model has the following beneficial effects: The installation structure of the angle encoder for a high-power permanent magnet motor used in mine hoisting disclosed in this utility model uses a flat key transmission connection between the angle measuring shaft and the rotating sleeve on which the angle encoder is installed to prevent relative rotation between the angle measuring shaft and the rotating sleeve; the use of a special-shaped set screw and an anti-loosening ring to prevent the set screw from loosening and falling off; thereby completely solving the reliability problem of the connection between the high-power permanent magnet motor used in mine hoisting and the external angle encoder, and ensuring the safe and reliable operation of the high-power permanent magnet motor used in mine hoisting. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the appearance of an existing brushless resolver transmitter;

[0014] Figure 2 A schematic diagram of the existing angle measuring shaft;

[0015] Figure 3 A schematic cross-sectional view of the connection structure between an existing brushless resolver transmitter and an angle measuring shaft;

[0016] Figure 4 This is a schematic diagram of the angle measuring shaft in Example 1;

[0017] Figure 5 This is a cross-sectional schematic diagram of the installation structure of the angle encoder for a high-power permanent magnet motor used in mine hoisting, as shown in Example 1.

[0018] Figure 6 This is a partially enlarged cross-sectional view of the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting in Example 1.

[0019] Figure 7 This is a schematic diagram of the appearance of the irregularly shaped set screw in Example 2;

[0020] Figure 8 This is a schematic diagram of the appearance of the anti-loosening ring in Example 2;

[0021] Figure 9 This is a cross-sectional schematic diagram of the installation structure of the angle encoder for a high-power permanent magnet motor used in mine hoisting, as shown in Example 2.

[0022] Figure 10 This is a partially enlarged cross-sectional view of the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting in Example 2;

[0023] Figure 11 This is a schematic diagram of the appearance of the anti-loosening ring in Example 3;

[0024] Figure 12 This is a cross-sectional schematic diagram of the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting in Example 3;

[0025] Figure 13 This is a partially enlarged cross-sectional view of the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting in Example 3;

[0026] Figure 14 This is a schematic diagram of the brushless resolver transmitter in Embodiment 4;

[0027] Figure 15 This is a schematic diagram of the angle measuring shaft in Example 4;

[0028] Figure 16 This is a cross-sectional schematic diagram of the installation structure of the angle encoder for a high-power permanent magnet motor used in mine hoisting, as shown in Example 4.

[0029] Figure 17This is a partially enlarged cross-sectional view of the installation structure of the angle encoder for a high-power permanent magnet motor used in mine hoisting, as described in Example 4.

[0030] In the diagram: 1. Angle encoder; 1.1. Rotary sleeve; 1.1.1. Set screw hole; 1.1.2. Rotary sleeve keyway; 2. Angle measuring shaft; 2.1. Connecting shaft head; 2.1.1. Set screw groove; 2.1.2. Connecting shaft head keyway; 3. Motor shaft; 4. Motor end cover; 5. Set screw; 6. Anti-loosening ring; 6.1. Anti-loosening ring body; 6.2. Anti-loosening groove; 6.3. Magnet; 6.4. Spring; 7. Irregular set screw; 7.1. Set screw head; 7.1.1. Wrench hole; 8. Flat key. Detailed Implementation

[0031] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0032] See the instruction manual appendix Figure 1 , 2 3: This shows the installation structure of an existing high-power permanent magnet motor angle encoder for mine hoisting; the instruction manual includes... Figure 1 The appearance of angle encoder 1 (model SG68-0280 brushless resolver transmitter) is shown. Angle encoder 1 has a rotating sleeve 1.1 rotatably mounted within it. Three set screw holes 1.1.1 are evenly distributed on the exposed left side wall of the rotating sleeve 1.1, and set screws 5 are threaded into these holes 1.1.1. The instruction manual is attached. Figure 2 The appearance of angle measuring shaft 2 is shown. A connecting shaft head 2.1 is located at the right end of angle measuring shaft 2. For details on the installation structure of the high-power permanent magnet motor angle encoder for mine hoisting, please refer to the appendix of the instruction manual. Figure 3Angle measuring shaft 2 is coaxially fixed at the right end of motor shaft 3. Motor end cover 4 is fixedly installed on the right side of motor shaft 3. The right end of angle measuring shaft 2 passes through motor end cover 4, and connecting shaft head 2.1 extends to the right side of motor end cover 4. Angle encoder 1 is fixedly installed on the right side of motor end cover 4 via encoder bracket. Connecting shaft head 2.1 is installed in the inner hole of rotating sleeve 1.1 and locked with set screw 5 in three set screw holes 1.1.1, thus fixing connecting shaft head 2.1 to rotating sleeve 1.1. After angle encoder 1 is installed, before the high-power permanent magnet motor for mine hoisting starts working, the initial phase angle of angle encoder 1 needs to be set to ensure the high-power permanent magnet motor for mine hoisting operates correctly. The problem with the existing installation structure of the angle encoder for the high-power permanent magnet motor used in mine hoisting is that the high-power permanent magnet motor needs to be braked and switched between forward and reverse directions frequently during operation, resulting in significant vibration and impact. This can cause the set screws that fix the rotating sleeve and the angle measuring shaft to loosen and fall off. In fact, if the set screws become even slightly loose during operation, the rotating sleeve 1.1 and the angle measuring shaft 2 will rotate relative to each other, causing the initial phase angle set by the high-power permanent magnet motor rotor (i.e., the initial phase angle set by the angle encoder 1) to change. As a result, the high-power permanent magnet motor used in mine hoisting cannot work properly.

[0033] Example 1, see appendix to the instruction manual. Figure 4-6 :

[0034] See the instruction manual appendix Figure 4 A set screw groove 2.1.1 is machined on the outer circular surface of the connecting shaft head 2.1 of the angle measuring shaft 2. The width of the set screw groove 2.1.1 is the same as the maximum diameter of the set screw 5; see the instruction manual appendix. Figure 5 , 6 After the connecting shaft head 2.1 is placed in the rotating sleeve 1.1, the set screw groove 2.1.1 is aligned with one of the set screw holes 1.1.1, and then the three set screws 5 are locked. After the set screws are locked, the inner end of the set screw 5 corresponding to the set screw groove 2.1.1 extends into the set screw groove 2.1.1. During the operation of the high-power permanent magnet motor for mine hoisting, even if the set screws become slightly loose, because the inner end of the set screw 5 extends into the set screw groove 2.1.1, there will be no relative rotation between the connecting shaft head 2.1 and the rotating sleeve 1.1. Furthermore, in this embodiment, to prevent the set screws 5 from becoming loose, the outer surface of the set screws 5 is coated with an anti-loosening nylon coating.

[0035] Example 2, see appendix to the instruction manual. Figure 7-10 :

[0036] In this embodiment, the set screw 5 in Embodiment 1 is replaced with a shaped set screw 7, see the appendix of the instruction manual. Figure 7The irregular set screw 7 has a hexagonal set screw head 7.1 at its upper end, and a hexagonal wrench hole 7.1.1 at the end of the set screw head 7.1 to facilitate tightening of the irregular set screw 7 with an internal hex wrench in small installation spaces; in addition, an anti-loosening ring 6 is provided on the outer circular surface of the exposed end of the rotating sleeve 1.1, see the instruction manual appendix. Figure 8 The anti-loosening ring 6 includes an anti-loosening ring body 6.1. Three rectangular anti-loosening grooves 6.2 are evenly distributed on the right end face of the anti-loosening ring body 6.1. The distance between opposite sides of the anti-loosening grooves 6.2 is equal to the distance between opposite sides of the set screw head 7.1. When the set screw head 7.1 is engaged in the anti-loosening grooves 6.2, it prevents the irregularly shaped set screw 7 from rotating. Three circular holes are provided between the three anti-loosening grooves 6.2, and magnets 6.3 are fixedly installed in the circular holes. (See the attached instruction manual.) Figure 9 , 10 Before connecting the shaft head 2.1 to the rotating sleeve 1.1, first attach the side of the anti-loosening ring 6 without the magnet 6.3 to the stepped surface on the left side of the connecting shaft head 2.1. Then, place the connecting shaft head 2.1 into the inner hole of the rotating sleeve 1.1, so that the set screw groove 2.1.1 corresponds to one of the set screw holes 1.1.1. Then, use an Allen wrench to tighten the three irregular set screws 7. After tightening, one of the opposite sides of the irregular set screw 7 should be parallel to the axis of the angle measuring shaft 2 (if it is not possible to ensure that one of the opposite sides of the irregular set screw 7 is parallel to the axis of the angle measuring shaft 2 after tightening, it can be adjusted by removing part of the material on the inner end face of the irregular set screw 7 with a file, or by placing a copper shim in the set screw hole 1.1.1). Then, the anti-loosening ring 6 attached to the stepped surface on the left side of the connecting shaft head 2.1 is rotated along the rotating sleeve 1.1. The outer circular surface of sleeve 1.1 moves to the right, causing the set screw head 7.1 of the irregular set screw 7 to be engaged in the anti-loosening groove 6.2. The hexagonal edge of the set screw head 7.1 abuts against the left side of the anti-loosening groove 6.2. At this time, there is a 0.5mm gap between the anti-loosening ring 6 and the adjacent end face of the angle encoder 1 to prevent the anti-loosening ring 6 from rubbing against the outer end face of the angle encoder 1 when the rotating sleeve 1.1 rotates. In this embodiment, the cooperation between the set screw head 7.1 and the anti-loosening groove 6.2 can prevent the irregular set screw 7 from loosening during operation. The magnet 6.3 provided on the anti-loosening ring 6 can generate a magnetic attraction between it and the adjacent end face of the angle encoder 1, preventing the anti-loosening ring 6 from moving to the left along the outer circular surface of the rotating sleeve 1.1 during operation, and preventing the set screw head 7.1 from coming out of the anti-loosening groove 6.2, so that the irregular set screw 7 loses its anti-loosening function.

[0037] The anti-loosening ring 6 in this embodiment is easy to assemble, but because it has a magnet 6.3, it is only used in the mounting structure of photoelectric angle encoders.

[0038] Example 3, see appendix to the instruction manual. Figure 11 , 12 13:

[0039] In this embodiment, the magnet 6.3 of the anti-loosening ring 6 in Embodiment 2 is replaced with a spring 6.4 to solve the magnetic interference that the magnet 6.4 may cause to the Hall element or brushless resolver transmitter; see the appendix of the specification. Figure 11 The anti-loosening ring 6 includes an anti-loosening ring body 6.1. Three rectangular anti-loosening grooves 6.2 are evenly distributed on the right end face of the anti-loosening ring body 6.1. The distance between the opposite sides of the anti-loosening grooves 6.2 is equal to the distance between the opposite sides of the set screw head 7.1. Three circular holes are evenly distributed on the left end face of the anti-loosening ring body 6.1, and springs 6.4 are disposed within these holes. (See attached instruction manual.) Figure 12 , 13 Before connecting the shaft head 2.1 to the rotating sleeve 1.1, first place the anti-loosening ring 6 on the outer circular surface of the exposed end of the rotating sleeve 1.1, and then place the connecting shaft head 2.1 in the inner hole of the rotating sleeve 1.1; before installing the shaped set screw 7, use three push blocks to place between the anti-loosening ring 6 and the angle encoder 1, so that the anti-loosening ring 6 moves towards the left step surface of the connecting shaft head 2.1, exposing the set screw hole 1.1.1 on the rotating sleeve 1.1; adjust the angle between the connecting shaft head 2.1 and the rotating sleeve 1.1 so that one of the set screw holes 1.1.1 corresponds to the set screw groove 2.1.1, and then use an Allen wrench to install and lock the three shaped set screws 7; after locking, one of the opposite sides of the shaped set screw 7 is parallel to the axis of the angle measuring shaft 2 (if it is not possible to ensure that one pair of opposite sides of the shaped set screw 7 is parallel to the axis of the angle measuring shaft 2 after locking, it can be repaired by filing). Adjustment can be achieved by removing part of the material from the inner end face of the irregular set screw 7, or by placing a copper shim in the set screw hole 1.1.1. Remove the three top blocks between the anti-loosening ring 6 and the angle encoder 1. Under the action of the spring 6.4, the anti-loosening ring 6 automatically moves to the right along the outer circumference of the rotating sleeve 1.1, so that the set screw head 7.1 of the irregular set screw 7 is positioned in the anti-loosening groove 6.2. Finally, the hexagonal edge of the set screw head 7.1 abuts against the left side of the anti-loosening groove 6.2. At this time, a 0.5mm gap is provided between the anti-loosening ring 6 and the adjacent end face of the angle encoder 1 to prevent the anti-loosening ring 6 from rubbing against the outer end face of the angle encoder 1 when the rotating sleeve 1.1 rotates. In this embodiment, the elastic force of the spring 6.4 prevents the anti-loosening ring 6 from moving to the left during operation. This embodiment can be used in the installation structure of angle encoders using Hall elements or brushless resolver transmitter principles.

[0040] The above three embodiments are applicable to the case where the inner hole of the rotating sleeve 1.1 of the existing angle encoder 1 is a circular hole.

[0041] Example 4, see appendix to the instruction manual. Figure 14-17 :

[0042] In this embodiment, based on Embodiment 2 or 3, the inner hole structure design of the rotating sleeve 1.1 of the existing angle encoder 1 is modified. See the appendix of the specification. Figure 14A keyway 1.1.2 for the rotating sleeve 1.1 of the angle encoder 1 is added to the inner hole; see the appendix of the instruction manual. Figure 15 To accommodate the modified angle encoder 1, a keyway 2.1.2 is provided on the outer circular surface of the connecting shaft head 2.1 of the angle measuring shaft 2; see the appendix of the instruction manual. Figure 16 , 17 The connecting shaft head 2.1 is set in the inner hole of the rotating sleeve 1.1. A flat key 8 is provided between the keyway 1.1.2 of the rotating sleeve and the keyway 2.1.2 of the connecting shaft head. The problem of relative rotation between the connecting shaft head 2.1 and the rotating sleeve 1.1.2 is solved by the cooperation of the flat key 8 with the keyway 1.1.2 of the rotating sleeve and the keyway 2.1.2 of the connecting shaft head. In the implementation of this embodiment, there is no need to adjust the alignment of the set screw groove 2.1.1 and the set screw hole 1.1.1, so the assembly is more convenient.

[0043] The parts of this utility model not described in detail are existing technologies.

Claims

1. A mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting, comprising an angle encoder (1) and an angle measuring shaft (2); a rotating sleeve (1.1) is rotatably provided in the angle encoder (1), and a plurality of set screw holes are evenly distributed on the exposed sidewall of one side of the rotating sleeve (1.1). 1.1.1), a set screw (5) is provided in the set screw hole (1.1.1) through thread engagement; one end of the angle measuring shaft (2) is provided with a connecting shaft head (2.1); the connecting shaft head (2.1) is set in the inner hole of the rotating sleeve (1.1), and the connecting shaft head (2.1) is tightened by the set screw (5) in the set screw hole (1.1.1), so that the connecting shaft head (2.1) is fixedly connected to the rotating sleeve (1.1); its characteristic is: The outer circumference of the connecting shaft head (2.1) is provided with a set screw groove (2.1.1), and the inner end of one of the set screws (5) extends to the set screw groove (2.1.1). In 2.1.1), the set screw (5) is used to prevent relative rotation between the connecting shaft head (2.1) and the rotating sleeve (1.1).

2. The mounting structure for the high-power permanent magnet motor angle encoder used in mine hoisting according to claim 1, characterized in that: The inner hole of the rotating sleeve (1.1) is provided with a rotating sleeve keyway (1.1.2); the outer surface of the connecting shaft head (2.1) is provided with a connecting shaft head keyway (2.1.2); the connecting shaft head (2.1) is set in the rotating sleeve (1.1), and a flat key (8) is provided between the rotating sleeve keyway (1.1.2) and the connecting shaft head keyway (2.1.2), so as to prevent relative rotation between the connecting shaft head (2.1) and the rotating sleeve (1.1) by means of the flat key (8).

3. The mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting according to claim 1 or 2, characterized in that: The set screw (5) adopts a special-shaped set screw (7), and the exposed end of the special-shaped set screw (7) is provided with a set screw head (7.1); the outer circular surface of the exposed end of the rotating sleeve (1.1) is provided with an anti-loosening ring (6); the anti-loosening ring (6) includes an anti-loosening ring body (6.1), and a number of anti-loosening grooves (6.2) are provided on one side end face of the anti-loosening ring body (6.1). The set screw head (7.1) of the special-shaped set screw (7) is set in the anti-loosening groove (6.2) to prevent the special-shaped set screw (7) from loosening during operation.

4. The mounting structure for the high-power permanent magnet motor angle encoder used in mine hoisting according to claim 3, characterized in that: The top screw head (7.1) abuts against the side of the anti-loosening groove (6.2); there is a gap between the anti-loosening ring (6) and the adjacent end face of the angle encoder (1).

5. The mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting according to claim 4, characterized in that: The anti-loosening ring (6) also includes an axial stop, which prevents the anti-loosening ring (6) from moving along the axis of the rotating sleeve (1.1) during operation.

6. The mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting according to claim 5, characterized in that: The axial stop is a magnet (6.3) or a spring (6.4).

7. The mounting structure for a high-power permanent magnet motor angle encoder used in mine hoisting according to claim 3, characterized in that: The end of the set screw head (7.1) of the irregular set screw (7) is provided with a wrench hole (7.1.1).

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