A protection device for motor performance test

Abstract

The utility model discloses a kind of protective devices for motor performance test, it is related to motor performance verification technical field.The protective device for motor performance test includes mounting bracket;Ratchet wheel is connected with motor output shaft transmission;Motor output shaft rotation energy can drive test device energy storage, simultaneously can drive ratchet wheel synchronous rotation;Multiple ratchets are equipped on the profile of ratchet wheel;Limiting piece is rotatably arranged in mounting bracket;Fixed part is arranged in mounting bracket;Elastic member one end is connected with fixed part and other end is connected with limiting piece;Elastic member can make limiting piece and ratchet abut;Limiting gap is set up on ratchet wheel;Motor output shaft rotates and drives ratchet wheel to rotate preset angle along first clock direction, can make test device complete energy storage, and limiting piece can be inserted into limiting gap to limit that ratchet wheel can only rotate along first clock direction.The protective device for motor performance test is used to protect motor in motor performance test, avoid motor to be seriously damaged, reduce test cost.

Description

Technical Field

[0001] This utility model relates to the field of motor performance verification technology, and in particular to a protective device for motor performance testing. Background Technology

[0002] Energy storage switches are key control devices in power systems used to store mechanical energy and quickly release it to drive switching equipment (such as circuit breakers) when needed. Their core function is to resolve the contradiction between the enormous mechanical force required for high-voltage / high-current switching operations and the limitations of manual operation, ensuring rapid and reliable switch operation through a pre-stored energy mechanism. Existing energy storage switches typically use a motor-driven energy storage mechanism (usually a closing spring). The motor compresses the closing spring through a transmission structure, allowing the spring to store elastic potential energy. When the switching equipment needs to close, the stored elastic potential energy is released, causing the switching equipment's contacts to close rapidly.

[0003] Currently, the motor needs to be tested for performance before it can be installed on the energy storage switch. During the test, there may be situations where the motor performance is poor and it cannot effectively drive the test device that simulates the energy storage mechanism to store energy completely. In such cases, the elastic potential energy stored in the test device will be applied to the motor in reverse, which will cause more serious damage to the motor and significantly increase the test cost.

[0004] Therefore, there is an urgent need for a protective device for motor performance testing to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a protective device for motor performance testing, which protects the motor during motor performance testing, prevents the motor from being seriously damaged, and reduces testing costs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a protective device for motor performance testing, wherein the output shaft of the motor is drivenly connected to the testing device; the testing device can simulate the energy storage mechanism in an energy storage switch; the protective device for motor performance testing includes a mounting frame, a ratchet, a limiting member, a fixing member, and an elastic member; the mounting frame is used to provide an installation position; the ratchet is drivenly connected to the output shaft of the motor; the rotation of the output shaft of the motor can drive the testing device to store energy, and at the same time drive the ratchet to rotate synchronously; the ratchet has multiple ratchet teeth arranged circumferentially on its outline; the limiting member is rotatably disposed on the mounting frame; the fixing member is disposed on the mounting frame; the fixing member, the limiting member, and the ratchet are all provided with The device is placed on the same side wall of the mounting bracket; an elastic element, one end of which is connected to the fixing element and the other end of which is connected to the limiting element; the elastic element allows one end of the limiting element to move towards the ratchet and abut against the ratchet teeth to restrict the ratchet to rotate only in the first clockwise direction; a limiting notch is also provided on the outline of the ratchet; the output shaft of the motor rotates in the first clockwise direction, causing the ratchet to rotate by a preset angle, which enables the test device to complete energy storage, and allows at least a portion of the limiting element to be inserted into the limiting notch to restrict the ratchet to rotate only in the first clockwise direction; when the test device releases energy, it can cause the output shaft of the motor to have a tendency to rotate in the second clockwise direction.

[0008] In some embodiments, the number of the limiting notches is multiple; the multiple limiting notches are centrally symmetrically arranged on the outline of the ratchet with the center line of the ratchet as the axis of symmetry; on the outline of the ratchet, the included angle between two adjacent limiting notches is the preset angle.

[0009] In some embodiments, the limiting member includes a first end and a second end; the first end is rotatably connected to the mounting bracket; the second end is provided with a connecting portion and a limiting portion; the connecting portion is connected to the elastic member; and the limiting portion is capable of abutting against the ratchet.

[0010] In some embodiments, the mounting bracket is provided with a rotating shaft; the first end is rotatably connected to the mounting bracket via the rotating shaft; in a first direction, the fixing member is located between the rotating shaft and the ratchet; the first direction is the radial direction of the ratchet; the elastic member can pull the connecting part, causing the limiting part to move towards the ratchet and abut against the ratchet teeth, so as to restrict the ratchet to rotate only in a first clockwise direction.

[0011] In some embodiments, the mounting bracket is provided with a rotating shaft; the first end is rotatably connected to the mounting bracket via the rotating shaft; in a first direction, the rotating shaft is located between the fixing member and the ratchet; the first direction is the radial direction of the ratchet; the elastic member can push the connecting part to move the limiting part toward the ratchet and abut against the ratchet teeth, so as to restrict the ratchet to rotate only in a first clockwise direction.

[0012] In some embodiments, a connecting through hole is formed at the center of the ratchet along its own centerline; a connecting keyway is formed on the inner sidewall of the connecting through hole; and the output shaft of the motor is connected to the ratchet key through the connecting keyway.

[0013] In some embodiments, the mounting bracket includes two support plates spaced apart along a second direction; the ratchet, the limiting member, the fixing member, and the elastic member are all disposed between the two support plates; the output shaft of the motor passes through the two support plates along the second direction; the second direction is perpendicular to the surface of the support plates.

[0014] In some embodiments, the two ends of the fixing member are respectively connected to the two support plates; a first limiting part is provided in the middle part of the fixing member; and the elastic member is connected to the first limiting part.

[0015] In some embodiments, the mounting bracket is provided with a rotating shaft; both ends of the rotating shaft are respectively connected to the two support plates; a second limiting part is provided in the middle part of the rotating shaft; the limiting member is rotatably connected to the second limiting part.

[0016] In some embodiments, the mounting bracket further includes a mounting plate; two support plates are vertically disposed on the mounting plate; the mounting plate can be detachably mounted to a fixed object.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a protective device for motor performance testing. A ratchet, a limiting member, and a fixing member are installed on the same side wall of the mounting frame, which are connected to the output shaft of the motor under test. This allows the ratchet to rotate synchronously when the motor output shaft rotates to store energy in the testing device. Additionally, an elastic member is provided at both ends, connected to the fixing member and the limiting member respectively. This allows the elastic member to engage with the ratchet teeth on the ratchet, restricting the ratchet to rotate only in a first clockwise direction. Furthermore, a limiting notch is provided on the contour of the ratchet. After the motor output shaft drives the ratchet to rotate by a preset angle, the testing device completes energy storage, and the limiting member is inserted into the limiting notch. The limiting notch also restricts the ratchet to rotate only in a first clockwise direction. This ensures that during the energy storage process of the test device driven by the motor's output shaft, if the motor performance is qualified, the motor output shaft drives the ratchet to rotate at a preset angle, allowing the test device to complete energy storage normally. At the same time, the limiting component of the aforementioned motor performance test protection device is inserted into the limiting notch on the ratchet profile, restricting the ratchet to rotate only in one direction (only along the first clockwise direction). This protects the motor and prevents the elastic potential energy from being applied to the motor output shaft to drive it to rotate in the opposite direction (along the second clockwise direction) during the active energy release process of the test device to complete the next test, which could lead to motor damage. If the motor's performance is poor (e.g., the gears in the internal reduction gear set are damaged), it cannot properly drive the test device to complete energy storage. Although the test device has not reached a fully stored energy state, it has still stored a certain amount of elastic potential energy. However, the motor can no longer drive the test device to continue storing energy. At this time, the elastic potential energy stored in the test device will be released and will directly act on the motor output shaft, causing the motor output shaft to have a tendency to rotate in the second clockwise direction (reverse). At this time, since the ratchet of the aforementioned motor performance test protection device is connected to the motor output shaft, when the motor output shaft has a tendency to rotate in the reverse direction, the ratchet of the aforementioned motor performance test protection device will also have a tendency to rotate in the reverse direction. When the ratchet wants to rotate in the reverse direction, the elastic element of the motor performance test protection device has already made the limiting element abut against the ratchet teeth. At this time, due to the limiting effect of the limiting element and the ratchet teeth, the ratchet cannot continue to rotate in the reverse direction, which further restricts the motor output shaft connected to it from rotating in the reverse direction. This can protect the motor and prevent the motor from rotating in reverse, which would cause more serious damage to the teeth of the internal reduction gear set, thus preventing more serious damage to the motor and effectively reducing the test cost. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a protective device for motor performance testing provided in a specific embodiment of this utility model;

[0020] Figure 2 yes Figure 1 The structure shown is a cross-sectional view along the AA direction.

[0021] In the picture:

[0022] 1. Mounting bracket; 11. Support plate; 12. Mounting plate; 2. Ratchet; 21. Ratchet tooth; 22. Limiting notch; 3. Limiting component; 31. First end; 32. Second end; 321. Connecting part; 322. Limiting part; 4. Fixing component; 5. Elastic component; 6. Rotating shaft;

[0023] X1, first direction; X2, second direction. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] like Figure 1 , Figure 2 As shown, this embodiment provides a protective device for motor performance testing. During motor performance testing, the output shaft of the motor is connected to the testing device via a transmission connection. This testing device can simulate the energy storage mechanism in an energy storage switch. That is, the testing device can also be driven by the motor to perform energy storage, and can also perform energy release after energy storage is completed. The protective device for motor performance testing includes a mounting bracket 1, a ratchet 2, a limiting member 3, a fixing member 4, and an elastic member 5.

[0029] like Figure 1 As shown, the mounting bracket 1 is used to provide an installation location. The mounting bracket 1 is, for example, a frame structure formed by combining multiple support plates 11 or mounting plates 12.

[0030] The aforementioned ratchet 2 is connected to the output shaft of a motor, which is the motor under test. The rotation of the motor's output shaft drives the test device to store energy and simultaneously drives the ratchet 2 to rotate synchronously. The ratchet 2 has multiple ratchet teeth 21 arranged circumferentially on its outline. It is easy to understand that the ratchet teeth 21 have an asymmetrical structure; one side of each ratchet tooth 21 has a gentler incline, while the other side has a steeper incline. This allows other structures to smoothly slide over the top of the teeth when they abut against the ratchet teeth 21 and move in the forward direction (along the gentler incline); however, when other structures abut against the ratchet teeth 21 and move in the reverse direction (along the steeper incline), they will be jammed by the ratchet teeth 21 and unable to slide over the top of the teeth.

[0031] The aforementioned limiting member 3 is rotatably mounted on the mounting frame 1. The limiting member 3 may be, for example, a limiting plate or a limiting block.

[0032] The aforementioned fastener 4 is also provided on the mounting bracket 1. Furthermore, the fastener 4, the aforementioned limiting member 3, and the aforementioned ratchet 2 are all provided on the same side wall of the mounting bracket 1.

[0033] like Figure 2 As shown, one end of the elastic member 5 is connected to the fixing member 4, and the other end is connected to the limiting member 3. The elastic member 5 allows one end of the limiting member 3 to move towards the ratchet 2 and abut against the ratchet tooth 21, thereby restricting the ratchet 2 to rotate only in a first clockwise direction. This first clockwise direction is, for example, a clockwise direction.

[0034] like Figure 2As shown, a limiting notch 22 is also provided on the outline of the ratchet 2. When the output shaft of the motor rotates in the first clockwise direction, it drives the ratchet 2 to rotate by a preset angle, enabling the test device to complete energy storage and allowing at least a portion of the limiting member 3 to be inserted into the limiting notch 22 to restrict the ratchet 2 to rotate only in the first clockwise direction. When the test device releases energy, it can cause the output shaft of the motor to have a tendency to rotate in the second clockwise direction. This second clockwise direction is opposite to the first clockwise direction, for example, counterclockwise.

[0035] Therefore, the protective device for motor performance testing provided in this embodiment provides a ratchet 2, a limiting member 3, and a fixing member 4 that are connected to the output shaft of the motor to be tested, on the same side wall of the mounting frame 1. This allows the ratchet 2 to rotate synchronously when the motor output shaft rotates to store energy in the testing device. In addition, an elastic member 5 is provided with its two ends connected to the fixing member 4 and the limiting member 3 respectively. The elastic member 5 allows the limiting member 3 to abut against the ratchet teeth 21 on the ratchet 2, restricting the ratchet 2 to rotate only in the first clockwise direction. Furthermore, a limiting notch 22 is provided on the contour of the ratchet 2. After the motor output shaft drives the ratchet 2 to rotate by a preset angle, the testing device completes energy storage, and the limiting member 3 can be inserted into the limiting notch 22. The limiting notch 22 also restricts the ratchet 2 to rotate only in the first clockwise direction. This ensures that during the energy storage process of the test device driven by the motor's output shaft, if the motor performance is qualified, the motor output shaft drives the ratchet 2 to rotate at a preset angle, allowing the test device to complete energy storage normally. At the same time, the limiting member 3 of the aforementioned motor performance test protection device is inserted into the limiting notch 22 on the contour of the ratchet 2, restricting the ratchet 2 to rotate only in one direction (only along the first clockwise direction). This can protect the motor and prevent the elastic potential energy from being applied to the motor output shaft to drive it to rotate in the opposite direction (along the second clockwise direction) during the active energy release process of the test device to complete the next test, thereby causing damage to the motor. If the motor's performance is poor (e.g., gears in the internal reduction gear set are damaged), it cannot properly drive the test device to complete energy storage. Although the test device has not reached a fully stored energy state, it has still stored a certain amount of elastic potential energy. However, the motor can no longer drive the test device to continue storing energy. At this time, the elastic potential energy stored in the test device will be released and will directly act on the motor output shaft, causing the motor output shaft to tend to rotate in the second clockwise direction (reverse). At this time, since the ratchet 2 of the aforementioned motor performance test protection device is connected to the motor output shaft, when the motor output shaft has the tendency to rotate in the reverse direction... The ratchet 2 of the aforementioned motor performance test protection device also tends to rotate in the opposite direction. When the ratchet 2 wants to rotate in the opposite direction, the elastic element 5 of the motor performance test protection device has already caused the limiting element 3 to abut against the ratchet tooth 21 of the ratchet 2. At this time, due to the limiting effect of the limiting element 3 and the ratchet tooth 21, the ratchet 2 cannot continue to rotate in the opposite direction. This further restricts the output shaft of the motor connected to it from rotating in the opposite direction, thus protecting the motor and preventing the tooth profile of the internal reduction gear set from being more severely damaged due to motor reversal, thereby avoiding more serious damage to the motor and effectively reducing the test cost.

[0036] In some embodiments, the number of limiting notches 22 provided on the contour of the ratchet 2 is multiple. The multiple limiting notches 22 are arranged centrally symmetrically on the contour of the ratchet 2 with the center line of the ratchet 2 as the axis of symmetry. The angle between two adjacent limiting notches 22 on the contour of the ratchet 2 is a preset angle. With this arrangement, after the motor-driven testing device has completed energy storage (at which point the elastic potential energy stored in the testing device is at its maximum), multiple limiting notches 22 provide multiple layers of protection for the motor, improving the reliability of the aforementioned motor performance testing protection device during use.

[0037] In some embodiments, such as Figure 2 As shown, the aforementioned limiting member 3 includes a first end 31 and a second end 32. The first end 31 of the limiting member 3 is rotatably connected to the mounting bracket 1, and the second end 32 of the limiting member 3 is provided with a connecting portion 321 and a limiting portion 322. The connecting portion 321 is connected to the aforementioned elastic member 5, and the limiting portion 322 can abut against the ratchet tooth 21 of the ratchet 2.

[0038] Furthermore, the mounting bracket 1 is provided with a rotating shaft 6, and the first end 31 of the limiting member 3 is rotatably connected to the mounting bracket 1 via the rotating shaft 6. In the first direction X1, the fixing member 4 is located between the rotating shaft 6 and the ratchet 2. Here, the first direction X1 is the radial direction of the ratchet 2. The elastic member 5 can pull the connecting part 321 of the limiting member 3, causing the limiting part 322 of the limiting member 3 to move towards the ratchet 2 and abut against the ratchet tooth 21, thereby restricting the ratchet 2 to rotate only in the first clockwise direction. The elastic member 5 is, for example, a tension spring (cylindrical tension spring).

[0039] Alternatively, the mounting bracket 1 may be equipped with a rotating shaft 6, through which the first end 31 of the limiting member 3 is rotatably connected to the mounting bracket 1. In the first direction X1, the rotating shaft 6 is located between the fixing member 4 and the ratchet 2. Here, the first direction X1 is the radial direction of the ratchet 2. The elastic member 5 can push the connecting portion 321 of the limiting member 3, causing the limiting portion 322 of the limiting member 3 to move closer to the ratchet 2 and abut against the ratchet tooth 21, thereby restricting the ratchet 2 to rotate only in the first clockwise direction. This elastic member 5 may be, for example, a compression spring (cylindrical compression spring).

[0040] The above configuration enables the elastic element 5 to drive the limiting element 3 to limit the ratchet 2, resulting in a simple structure that is easy to manufacture. Furthermore, the technology in this field allows for flexible adjustment of the position of the elastic element 5 according to actual application scenarios, facilitating component installation and arrangement.

[0041] In some embodiments, a connecting through hole is formed at the center of the ratchet 2 along its own centerline. A connecting keyway is formed on the inner sidewall of the connecting through hole, and the output shaft of the motor is connected to the ratchet 2 via the connecting keyway. This arrangement enables the transmission connection between the motor output shaft and the ratchet 2 of the motor performance testing protection device. The connection method is simple, easy to disassemble and install, and convenient for performance testing of different motors.

[0042] In some embodiments, such as Figure 1 As shown, the mounting frame 1 includes two support plates 11 spaced apart along a second direction X2. The ratchet 2, limiting member 3, fixing member 4, and elastic member 5 of the motor performance testing protection device are all disposed between the two support plates 11. The output shaft of the motor passes through the two support plates 11 along the second direction X2, where the second direction X2 is perpendicular to the surface of the support plates 11. It is easy to understand that both ends of the fixing member 4 are connected to the two support plates 11 respectively. Furthermore, when a rotating shaft 6 is provided on the mounting frame 1, both ends of the rotating shaft 6 are connected to the two support plates 11 respectively. This arrangement improves the stability of the mounting frame 1, thereby enhancing the reliability of the motor performance testing protection device during use.

[0043] Furthermore, a first limiting part 322 is provided in the middle of the aforementioned fixing member 4, and the aforementioned elastic member 5 is connected to the first limiting part 322. The first limiting part 322 is, for example, a limiting groove. With this arrangement, the first limiting part 322 can be used to limit the first elastic member 5, preventing the end of the elastic member 5 from sliding along the extension direction of the fixing member 4, and ensuring the accuracy of the force applied by the elastic member 5.

[0044] Similarly, a second limiting part 322 is provided in the middle of the aforementioned rotating shaft 6. This second limiting part 322 is, for example, a limiting groove. The aforementioned limiting member 3 is rotatably connected to the second limiting part 322. With this arrangement, the second limiting part 322 can be used to limit the first elastic member 5, preventing the end of the limiting member 3 from sliding along the extension direction of the rotating shaft 6, and ensuring the accuracy of the limiting member 3 in limiting the ratchet teeth 21 on the ratchet 2.

[0045] In some implementations, such as Figure 1 As shown, the mounting bracket 1 also includes a mounting plate 12. The two support plates 11 are vertically arranged on the mounting plate 12, which can be detachably installed on a fixed object. This arrangement facilitates the installation and fixation of the mounting bracket 1, improving the practicality of the aforementioned motor performance testing protection device.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A protective device for testing the performance of a motor, wherein the output shaft of the motor is connected to the testing device in a transmission manner; the testing device is capable of simulating the energy storage mechanism in an energy storage switch; characterized in that, include: Mounting bracket (1) is used to provide an installation location; The ratchet (2) is connected to the output shaft of the motor; the rotation of the output shaft of the motor can drive the test device to store energy, and at the same time drive the ratchet (2) to rotate synchronously; the ratchet (2) has multiple ratchet teeth (21) arranged circumferentially on its outline. The limiting member (3) is rotatably disposed on the mounting bracket (1); The fixing member (4) is provided on the mounting frame (1); the fixing member (4), the limiting member (3) and the ratchet (2) are all provided on the same side wall of the mounting frame (1); The elastic element (5) is connected at one end to the fixing element (4) and at the other end to the limiting element (3); the elastic element (5) enables one end of the limiting element (3) to move toward the ratchet (2) and abut against the ratchet tooth (21) to restrict the ratchet (2) to rotate only in the first clockwise direction; The ratchet (2) also has a limiting notch (22) on its outline; the output shaft of the motor rotates in the first clockwise direction to drive the ratchet (2) to rotate by a preset angle, which enables the test device to complete energy storage, and enables at least part of the limiting member (3) to be inserted into the limiting notch (22) to restrict the ratchet (2) to rotate only in the first clockwise direction; when the test device releases energy, it enables the output shaft of the motor to have a tendency to rotate in the second clockwise direction.

2. The protective device for motor performance testing according to claim 1, characterized in that, The number of the limiting notches (22) is multiple; the multiple limiting notches (22) are arranged in a centrally symmetrical manner on the outline of the ratchet (2) with the center line of the ratchet (2) as the axis of symmetry; on the outline of the ratchet (2), the included angle between two adjacent limiting notches (22) is the preset angle.

3. The protective device for motor performance testing according to claim 1, characterized in that, The limiting member (3) includes a first end (31) and a second end (32); the first end (31) is rotatably connected to the mounting bracket (1); the second end (32) is provided with a connecting part (321) and a limiting part (322); the connecting part (321) is connected to the elastic member (5); the limiting part (322) can abut against the ratchet (21).

4. The protective device for motor performance testing according to claim 3, characterized in that, The mounting bracket (1) is provided with a rotating shaft (6); the first end (31) is rotatably connected to the mounting bracket (1) through the rotating shaft (6); In the first direction (X1), the fixing member (4) is located between the rotating shaft (6) and the ratchet (2); the first direction (X1) is the radial direction of the ratchet (2); The elastic element (5) can pull the connecting part (321) so that the limiting part (322) moves toward the ratchet (2) and abuts against the ratchet tooth (21) to restrict the ratchet (2) to rotate only in the first clockwise direction.

5. A protective device for motor performance testing according to claim 3, characterized in that, The mounting bracket (1) is provided with a rotating shaft (6); the first end (31) is rotatably connected to the mounting bracket (1) through the rotating shaft (6); In the first direction (X1), the rotating shaft (6) is located between the fixing member (4) and the ratchet (2); the first direction (X1) is the radial direction of the ratchet (2); The elastic element (5) can push the connecting part (321) so that the limiting part (322) moves toward the ratchet (2) and abuts against the ratchet tooth (21) to restrict the ratchet (2) to rotate only in the first clockwise direction.

6. The protective device for motor performance testing according to claim 1, characterized in that, The ratchet (2) has a connecting through hole at its center along its own center line; the inner sidewall of the connecting through hole has a connecting keyway; the output shaft of the motor is connected to the ratchet (2) by the connecting keyway.

7. A protective device for motor performance testing according to any one of claims 1 to 6, characterized in that, The mounting bracket (1) includes two support plates (11) spaced apart along a second direction (X2); the ratchet (2), the limiting member (3), the fixing member (4) and the elastic member (5) are all disposed between the two support plates (11); the output shaft of the motor passes through the two support plates (11) along the second direction (X2); the second direction (X2) is perpendicular to the surface of the support plate (11).

8. A protective device for motor performance testing according to claim 7, characterized in that, The two ends of the fixing member (4) are respectively connected to the two support plates (11); a first limiting part (322) is provided in the middle part of the fixing member (4); the elastic member (5) is connected to the first limiting part (322).

9. A protective device for motor performance testing according to claim 7, characterized in that, The mounting bracket (1) is provided with a rotating shaft (6); the two ends of the rotating shaft (6) are respectively connected to the two support plates (11); a second limiting part (322) is provided in the middle part of the rotating shaft (6); the limiting member (3) is rotatably connected to the second limiting part (322).

10. A protective device for motor performance testing according to claim 7, characterized in that, The mounting bracket (1) also includes a mounting plate (12); two support plates (11) are vertically arranged on the mounting plate (12); the mounting plate (12) can be detachably installed on a fixed object.

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