Electric hoist testing device

Abstract

The invention relates to the technical field of electric hoists, and discloses an electric hoist test device, which comprises a test bed fixed on the ground, a winding wheel rotatably connected to the top surface of the test bed, a steel wire rope wound on the winding wheel, and a lifting hook connected to one end of the steel wire rope and distributed in the vertical direction; the driving disc is coaxially arranged at one end of the winding wheel, and the driving disc is detachably connected with the winding wheel; the brake disc is located on the side, away from the winding wheel, of the transmission disc, an electromagnetic clutch assembly is arranged on the test bed, the control end of the electromagnetic clutch assembly is connected with the brake disc, so that the brake disc abuts against or does not make contact with the transmission disc, and when the brake disc abuts against the transmission disc, the brake disc and the transmission disc are relatively fixed; and the supporting sleeve is arranged on the test bed, a stress shaft is fixed in the supporting sleeve, the stress shaft is in key connection with the brake disc, and the stress shaft is used for acquiring a torque signal of the brake disc. And effective test research on the rotation inertia of the electric hoist during sudden stop can be realized.

Description

Technical Field

[0001] This invention relates to the field of electric hoist technology, and in particular to an electric hoist testing device. Background Technology

[0002] Electric hoists, as a common lifting device, have advantages such as small size and simple operation. Because electric hoists use low-voltage control and have relatively low mechanical efficiency, they are equipped with braking systems to improve safety. After assembly, the electric hoist needs to be tested for its load capacity. However, traditional testing devices mostly test the pulling force of the electric hoist. In actual use, the rotational inertia generated during braking also affects the brake disc and winding wheel. Prolonged use can lead to shaft breakage and reduced lifting accuracy. Currently, existing technologies lack research methods on the impact of rotational inertia on the winding wheel and brake disc, resulting in limitations in the testing of electric hoists. Therefore, this patent proposes an electric hoist testing device to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of this invention is to provide an electric hoist testing device to solve the problems existing in the prior art, and to effectively conduct experimental research on the rotational inertia of an electric hoist during an emergency stop.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides an electric hoist testing device, comprising: The test bench is fixed to the ground. A winding wheel is connected to the top surface of the test bench. A steel wire rope is wound on the winding wheel. A hook is connected to one end of the steel wire rope. The hooks are distributed in the vertical direction. A drive disc is coaxially disposed at one end of the winding wheel, and the drive disc is detachably connected to the winding wheel; A brake disc is located on the side of the transmission disc away from the winding wheel. An electromagnetic clutch assembly is provided on the test bench. The control end of the electromagnetic clutch assembly is connected to the brake disc so that the brake disc may abut or not contact the transmission disc. When the brake disc abuts the transmission disc, the two are relatively fixed. A support sleeve is provided on the test bench. A stress shaft is fixed inside the support sleeve. The stress shaft is keyed to the brake disc and is used to acquire the torque signal of the brake disc.

[0005] Preferably, the electromagnetic clutch assembly includes: A connecting sleeve is fixed to the center of the inner side wall of the support sleeve. The connecting sleeve extends horizontally toward the transmission disk. An electromagnet is fixed to the side of the connecting sleeve near the transmission disk. A transmission ring is slidably fitted onto the outside of the connecting sleeve and fixedly connected to the brake disc. A support rod is fixedly connected to the inner ring side of the transmission ring. A sliding groove is opened on the side wall of the connecting sleeve, and the support rod is slidably fitted into the sliding groove. The iron block has a fixed rod at one end of the support rod that extends into the connecting sleeve. The iron block is fixed to the side of the fixed rod near the electromagnet. A reset member is provided on the support sleeve. The reset member is connected to the iron block. The iron block has an elastic tendency to move away from the electromagnet.

[0006] Preferably, the reset member includes a support spring, which is wound around the outside of the connecting sleeve, and the two ends of the support spring are respectively fixed to the transmission ring and the inner wall surface of the support sleeve.

[0007] Preferably, the stress shaft is fixedly connected to the inner ring side of the support sleeve, a keyway is provided on the inner ring side of the stress shaft, a connecting key is coaxially fixedly connected to the side of the brake disc near the support sleeve, the connecting key slides in the keyway, and the connecting key is sleeved outside the connecting sleeve, and the transmission ring is fixedly connected to the side wall of the connecting key.

[0008] Preferably, a signal receiver is fixedly connected to the outer wall of the support sleeve, and a plurality of stress sensing plates are distributed at equal intervals along the axial direction inside the stress axis, and the stress sensing plates are communicatively connected to the signal receiver.

[0009] Preferred options also include: The first slider is slidably connected to the side of the transmission disc away from the winding wheel, and the support sleeve is fixedly connected to the top surface of the first slider; The first screw is provided with a groove on the top surface of the test bench. The first screw is rotated into the groove. The first slider is threaded onto the first screw and slides in the groove. The first geared motor is fixedly connected to one side of the test bench, and the output shaft of the first geared motor is coaxially fixedly connected to the first screw.

[0010] Preferably, the furthest distance between the brake disc and the transmission disc is less than the furthest distance between the iron block and the electromagnet.

[0011] Preferably, a drive rod is fixedly connected to the shaft of the take-up reel, and a second screw is fixedly connected to the drive rod in the direction of the transmission disc. A sliding key is sleeved and fixedly connected to the second screw, and the transmission disc is sleeved on the sliding key. A nut is threadedly connected to the portion of the second screw away from the sliding key, and the transmission disc abuts against the side wall of the drive rod through the nut.

[0012] Preferably, a mounting plate is fixedly connected to the top surface of the test bench, and a ferrule is fixedly connected to the top of the mounting plate. The ferrule is fitted onto the outer periphery of the drive rod, and the inner ring of the ferrule is rotatably connected to the drive rod through a bearing.

[0013] Preferred options also include: A support frame is fixed to one side of the test bench. A guide wheel is connected to the top of the support frame. The guide wheel is positioned horizontally above the test bench. The length of the winding wheel is less than the length of the guide wheel. The wire rope slides in contact with the top of the guide wheel. The hook extends vertically downward relative to the guide wheel.

[0014] The present invention discloses the following technical effects: This invention simulates the braking process of the winding wheel by fixing the transmission disc to the winding wheel and abutting it with the brake disc. When the brake disc provides braking force, the torque transmitted on the brake disc is detected via a stress axis, effectively enabling the detection and study of the rotational inertial force generated during an emergency stop of the electric hoist. Furthermore, setting the test bench on the ground and detachably connecting the transmission disc and the winding wheel makes it easier for personnel to replace the transmission disc. During the experiment, the braking force between the winding wheel and the brake disc is adjusted by replacing transmission discs of different materials and thicknesses, enhancing the variation of the basic parameters in the experimental study. Additionally, the brake disc is controlled by an electromagnetic clutch assembly, ensuring timely braking of the transmission disc and improving the accuracy of the experiment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a diagram showing the connection relationship between the test bench and the support frame in this invention; Figure 2 This is a diagram showing the connection relationship between the deflector plate and the winding reel in this invention; Figure 3 This is a diagram showing the connection relationship between the driving rod and the second screw in this invention; Figure 4 This is a diagram showing the connection relationship between the brake disc and the nut in this invention; Figure 5 This is a diagram showing the connection relationship between the connecting key and the stress axis in this invention; Figure 6 This is a diagram showing the connection relationship between the transmission ring and the connecting key in this invention; Figure 7 This is a diagram showing the connection relationship between the fixed rod and the support rod in this invention; The components include: 1. Test bench; 2. Winding reel; 3. Wire rope; 4. Hook; 5. Transmission disc; 6. Brake disc; 7. Support sleeve; 8. Stress shaft; 9. Electric motor; 10. Paddle plate; 11. Connecting sleeve; 12. Electromagnet; 13. Transmission ring; 14. Support rod; 15. Fixing rod; 16. Iron block; 17. Support spring; 18. Connecting key; 19. Signal receiver; 20. Stress sensing plate; 21. First slider; 22. First screw; 23. First geared motor; 24. Drive rod; 25. Second screw; 26. Sliding key; 27. Nut; 28. Mounting plate; 29. ​​Sleeve; 30. Bearing; 31. Support frame; 32. Guide wheel. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1-7 The present invention provides an electric hoist testing device, comprising: Test bench 1 is fixed to the ground. A winding wheel 2 is connected to the top surface of test bench 1. A steel wire rope 3 is wound on the winding wheel 2. A hook 4 is connected to one end of the steel wire rope 3. The hooks 4 are distributed in the vertical direction. The drive disc 5 is coaxially mounted at one end of the winding wheel 2, and the drive disc 5 and the winding wheel 2 are detachably connected. The brake disc 6 is located on the side of the transmission disc 5 away from the winding wheel 2. An electromagnetic clutch assembly is provided on the test bench 1. The control end of the electromagnetic clutch assembly is connected to the brake disc 6 so that the brake disc 6 and the transmission disc 5 may abut or not contact each other. When the brake disc 6 and the transmission disc 5 abut each other, the two are relatively fixed. A support sleeve 7 is set on the test bench 1. A stress shaft 8 is fixed inside the support sleeve 7. The stress shaft 8 is keyed to the brake disc 6. The stress shaft 8 is used to obtain the torque signal of the brake disc 6.

[0020] This invention simulates the braking process of the winding wheel 2 by fixing the transmission disc 5 to the winding wheel 2 and abutting the transmission disc 5 with the brake disc 6. When the brake disc 6 provides braking force, the torque transmitted on the brake disc 6 is detected through the stress shaft 8, effectively realizing the detection and research of the rotational inertial force generated when the electric hoist stops suddenly. In addition, the test bench 1 is set on the ground, and the transmission disc 5 and the winding wheel 2 are detachably connected, making it easier for personnel to replace the transmission disc 5. During the test, the braking force between the winding wheel 2 and the brake disc 6 is adjusted by replacing the transmission disc 5 with transmission discs of different materials and thicknesses, enhancing the variation of the basic parameters of the test. In addition, the brake disc 6 is controlled by an electromagnetic clutch assembly, which can ensure the timely braking of the transmission disc 5 by the brake disc 6 and improve the accuracy of the test.

[0021] In this technical solution, the wire rope 3 is extended upward at an angle, and the hook 4 is arranged vertically. During the winding process, the hook 4 is lifted vertically upward, so that the test platform 1 is placed on the ground, which is convenient for personnel to operate, without changing the original lifting process, and ensuring that the rotational inertia of sudden stop during the actual lifting process can be effectively detected.

[0022] Specifically, an electric motor 9 is fixedly connected to the top surface of the test bench 1. The output shaft of the electric motor 9 is coaxially fixedly connected to the winding wheel 2 to drive the winding wheel 2 to wind the wire rope 3. A lever plate 10 is movably connected to the side of the test bench 1 near the extended end of the wire rope 3. It is used to adjust the position of the wire rope 3 so that the winding wheel 2 winds the wire rope 3 evenly. This is a common structure of electric hoists and will not be described in detail.

[0023] Furthermore, the electromagnetic clutch assembly includes: The connecting sleeve 11 is fixed to the center of the inner wall of the support sleeve 7. The connecting sleeve 11 extends horizontally toward the transmission disk 5. An electromagnet 12 is fixed to the side of the connecting sleeve 11 near the transmission disk 5. The transmission ring 13 is slidably fitted outside the connecting sleeve 11 and fixedly connected to the brake disc 6. A support rod 14 is fixedly connected to the inner ring side of the transmission ring 13. A sliding groove is opened on the side wall of the connecting sleeve 11, and the support rod 14 is slidably fitted in the sliding groove. The iron block 16 and the support rod 14 are fixed to a fixed rod 15 at one end of the connecting sleeve 11. The iron block 16 is fixed to the side of the fixed rod 15 near the electromagnet 12. A reset member is provided on the support sleeve 7. The reset member is connected to the iron block 16. The iron block 16 has an elastic tendency to move away from the electromagnet 12.

[0024] The connecting sleeve 11 is made of a common magnetically shielded metal material, such as pure iron or silicon steel. The connecting sleeve 11 is fixed to the center of the support sleeve 7, and an electromagnet 12 is fixed to the end of the connecting sleeve 11 away from the support sleeve 7. The electromagnet 12 is used to magnetically attract the iron block 16, so that the iron block 16 drives the fixed rod 15 and the support rod 14 to move the transmission ring 13. The transmission ring 13 is fixed to the brake disc 6, thereby driving the brake disc 6 to extend out of the support sleeve 7, so that the brake disc 6 brakes the transmission disc 5. After the electromagnet 12 is de-energized, the reset component can drive the iron block 16 to reset, so that the brake disc 6 is separated from the transmission disc 5.

[0025] Furthermore, the reset component includes a support spring 17, which is wound around the outside of the connecting sleeve 11, and the two ends of the support spring 17 are respectively fixed to the transmission ring 13 and the inner wall surface of the support sleeve 7.

[0026] The support spring 17 is wound around the connecting sleeve 11. When the transmission ring 13 slides, the support spring 17 is stretched and does not contact the connecting sleeve 11. As the electromagnet 12 no longer attracts the iron block 16, the elastic potential energy of the support spring 17 drives the transmission ring 13 and the brake disc 6 to reset.

[0027] Furthermore, the stress shaft 8 is fixedly connected to the inner ring side of the support sleeve 7. A keyway is provided on the inner ring side of the stress shaft 8. A connecting key 18 is coaxially fixedly connected to the side of the brake disc 6 near the support sleeve 7. The connecting key 18 is slidably connected in the keyway and is sleeved on the outside of the connecting sleeve 11. The transmission ring 13 is fixedly connected to the side wall of the connecting key 18.

[0028] By connecting key 18 and keyway, the transmission ring 13 and brake disc 6 are prevented from rotating relative to stress shaft 8. Thus, when brake disc 6 and transmission disc 5 are braked, brake disc 6 directly feeds back the rotational inertia of transmission disc 5 and winding wheel 2. The rotational torque is applied to stress shaft 8 through connecting key 18, thereby detecting the torque of brake disc 6.

[0029] Furthermore, a signal receiver 19 is fixedly connected to the outer wall of the support sleeve 7, and several stress sensing plates 20 are evenly distributed along the axial direction inside the stress axis 8. The stress sensing plates 20 are communicatively connected to the signal receiver 19.

[0030] The stress change of the stress axis 8 is obtained by the stress sensing plate 20, thereby obtaining the rotational inertia of the winding wheel 2. The torque signal is received and transmitted to the external computer by the signal receiver 19 to realize the recording of the detection data.

[0031] Furthermore, it also includes: The first slider 21 is slidably connected to the side of the transmission disc 5 away from the winding wheel 2; the support sleeve 7 is fixedly connected to the top surface of the first slider 21.

[0032] The first screw 22 is rotated into the groove on the top surface of the test bench 1. The first slider 21 is threaded onto the first screw 22 and slides in the groove. The first geared motor 23 is fixedly connected to one side of the test bench 1, and the output shaft of the first geared motor 23 is coaxially fixedly connected to the first screw 22.

[0033] The first screw 22 is rotated by the first geared motor 23, causing the first slider 21 to slide along the groove, adjusting the distance between the brake disc 6 and the transmission disc 5. When it is necessary to disassemble the transmission disc 5, the brake disc 6 is moved away from the transmission disc 5 to make structural room for the transmission disc 5. The first geared motor 23 is a common worm gear reducer motor, which can improve the stability of the first slider 21 and ensure the braking effect of the brake disc 6 and the transmission disc 5.

[0034] Furthermore, the furthest distance between the brake disc 6 and the transmission disc 5 is less than the furthest distance between the iron block 16 and the electromagnet 12.

[0035] After the electromagnet 12 attracts the iron block 16, the brake disc 6 extends relative to the support sleeve 7, ensuring that the brake disc 6 and the transmission disc 5 make effective contact and abut against each other, thereby achieving braking of the transmission disc 5 and the winding wheel 2.

[0036] Furthermore, a drive rod 24 is fixedly connected to the shaft of the take-up reel 2, and a second screw 25 is fixedly connected to the drive rod 24 in the direction of the transmission disc 5. A sliding key 26 is sleeved and fixedly connected to the second screw 25, and the transmission disc 5 is sleeved on the sliding key 26. A nut 27 is threadedly connected to the part of the second screw 25 away from the sliding key 26, and the transmission disc 5 abuts against the side wall of the drive rod 24 through the nut 27.

[0037] The transmission disc 5 is fixed to the winding wheel 2 by threading the nut 27 to the second screw 25, and the transmission disc 5 is abutted against the side wall of the drive rod 24. The transmission disc 5 is then detached from the drive rod 24 by turning the nut 27 and sliding the transmission disc 5 away from the slide key 26.

[0038] In one embodiment of this technical solution, the diameter of the nut 27 is smaller than the diameter of the connecting sleeve 11, so as to prevent the nut 27 from obstructing the contact and abutment between the brake disc 6 and the transmission disc 5.

[0039] Furthermore, a mounting plate 28 is fixedly connected to the top surface of the test bench 1, and a ferrule 29 is fixedly connected to the top of the mounting plate 28. The ferrule 29 is fitted on the outer periphery of the drive rod 24, and the inner ring of the ferrule 29 is rotatably connected to the drive rod 24 through a bearing 30.

[0040] The drive rod 24 is rotatably supported by the mounting plate 28 and the bearing 30, so that the winding wheel 2 is rotatably connected to the test bench 1. Understandably, the winding wheel 2 can maintain a horizontal rotation state under the support of the mounting plate 28, which is a conventional design.

[0041] Furthermore, it also includes: The support frame 31 is fixed on one side of the test bench 1. The top of the support frame 31 is connected to the guide wheel 32. The guide wheel 32 is set horizontally above the test bench 1. The length of the winding wheel 2 is less than the length of the guide wheel 32. The wire rope 3 slides in contact with the top of the guide wheel 32. The hook 4 extends vertically downward relative to the guide wheel 32.

[0042] The guide wheel 32 is raised by the support frame 31, the end of the wire rope 3 extends out of the winding wheel 2 and passes around the guide wheel 32, and the hook 4 is lowered vertically. The hook 4 is used to lift the heavy object and raise it vertically, effectively simulating the actual process of lifting vertically upward. Moreover, the length of the guide wheel 32 can also meet the needs of the winding wheel 2 to move the wire rope 3 during the winding process.

[0043] This invention provides a testing method for electric hoists: The hook 4 lifts the heavy object, and the electric motor 9 drives the winding wheel 2 to wind it up. After reaching the designated height, the electric motor 9 is stopped. The electromagnet 12 is energized, and the electromagnet 12 attracts the iron block 16, which in turn causes the support rod 14, transmission ring 13, and connecting key 18 to slide along the keyway. This causes the brake disc 6 to extend out of the support sleeve 7 and come into contact with the transmission disc 5. The two are then fixed in place, and the connecting key 18 fixed on the brake disc 6 generates a torsional force due to rotational inertia with the stress shaft 8. The stress change signal is obtained through the stress sensing plate 20 fixed inside the stress shaft 8 and transmitted to the external computer. This allows for the experimental detection of the rotational inertia of the winding wheel 2 during actual use, effectively obtaining the torque force of the winding wheel 2 and the brake disc 6, and enabling experimental research on the rotational inertia of the electric hoist during emergency stop.

[0044] Furthermore, during the test, by moving the first slider 21 away from the winding wheel 2, the brake disc 6 and the transmission disc 5 are moved away from each other, and the transmission disc 5 is removed from the drive rod 24 by turning the nut 27. By replacing the transmission disc 5 with one of different materials and thicknesses, the braking force of the transmission disc 5 and the brake disc 6 is adjusted, and the weight suspended on the hook 4 is increased to adjust the lifting weight, thereby increasing the parameters of the test data and improving the accuracy of the test.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A testing device for an electric hoist, characterized in that, include: The test bench (1) is fixed on the ground. A winding wheel (2) is connected to the top surface of the test bench (1). A steel wire rope (3) is wound on the winding wheel (2). A hook (4) is connected to one end of the steel wire rope (3). The hook (4) is distributed in the vertical direction. The transmission disc (5) is coaxially disposed at one end of the winding wheel (2), and the transmission disc (5) is detachably connected to the winding wheel (2); The brake disc (6) is located on the side of the transmission disc (5) away from the winding wheel (2). An electromagnetic clutch assembly is provided on the test bench (1). The control end of the electromagnetic clutch assembly is connected to the brake disc (6) so that the brake disc (6) and the transmission disc (5) may abut or not contact each other. When the brake disc (6) and the transmission disc (5) abut each other, they are relatively fixed. A support sleeve (7) is set on the test bench (1). A stress shaft (8) is fixed inside the support sleeve (7). The stress shaft (8) is keyed to the brake disc (6). The stress shaft (8) is used to obtain the torque signal of the brake disc (6).

2. The electric hoist testing device according to claim 1, characterized in that, The electromagnetic clutch assembly includes: A connecting sleeve (11) is fixed to the center of the inner wall of the support sleeve (7). The connecting sleeve (11) extends horizontally toward the transmission disk (5). An electromagnet (12) is fixed to the side of the connecting sleeve (11) near the transmission disk (5). The transmission ring (13) is slidably fitted outside the connecting sleeve (11) and fixedly connected to the brake disc (6). A support rod (14) is fixedly connected to the inner ring side of the transmission ring (13). A sliding groove is opened on the side wall of the connecting sleeve (11), and the support rod (14) is slidably fitted in the sliding groove. The iron block (16) has a fixed rod (15) fixed to one end of the support rod (14) that extends into the connecting sleeve (11). The iron block (16) is fixed to the side of the fixed rod (15) near the electromagnet (12). A reset member is provided on the support sleeve (7). The reset member is connected to the iron block (16). The iron block (16) has an elastic tendency to move away from the electromagnet (12).

3. The electric hoist testing device according to claim 2, characterized in that: The reset component includes a support spring (17) which is wound around the connecting sleeve (11), and the two ends of the support spring (17) are respectively fixed to the inner wall surfaces of the transmission ring (13) and the support sleeve (7).

4. The electric hoist testing device according to claim 2, characterized in that: The stress shaft (8) is circumferentially fixed to the inner ring side of the support sleeve (7). A keyway is provided on the inner ring side of the stress shaft (8). A connecting key (18) is coaxially fixed to the side of the brake disc (6) near the support sleeve (7). The connecting key (18) slides in the keyway and is sleeved outside the connecting sleeve (11). The transmission ring (13) is fixed to the side wall of the connecting key (18).

5. The electric hoist testing device according to claim 1, characterized in that: A signal receiver (19) is fixed to the outer wall of the support sleeve (7), and several stress sensing plates (20) are evenly distributed along the axial direction inside the stress shaft (8). The stress sensing plates (20) are communicatively connected to the signal receiver (19).

6. The electric hoist testing device according to claim 1, characterized in that, Also includes: The first slider (21) is slidably connected to the side of the transmission disc (5) away from the winding wheel (2), and the support sleeve (7) is fixed to the top surface of the first slider (21); The first screw (22) is provided with a groove on the top surface of the test bench (1). The first screw (22) is rotated into the groove. The first slider (21) is threaded onto the first screw (22) and slides in the groove. The first geared motor (23) is fixedly connected to one side of the test bench (1), and the output shaft of the first geared motor (23) is coaxially fixedly connected to the first screw (22).

7. The electric hoist testing device according to claim 2, characterized in that: The furthest distance between the brake disc (6) and the transmission disc (5) is less than the furthest distance between the iron block (16) and the electromagnet (12).

8. The electric hoist testing device according to claim 1, characterized in that: The winding reel (2) has a drive rod (24) fixedly connected to its shaft. The drive rod (24) has a second screw (25) fixedly connected to it in the direction of the transmission disc (5). A sliding key (26) is fitted and fixedly connected to the second screw (25). The transmission disc (5) is fitted on the sliding key (26). A nut (27) is threadedly connected to the part of the second screw (25) away from the sliding key (26). The transmission disc (5) abuts against the side wall of the drive rod (24) through the nut (27).

9. The electric hoist testing device according to claim 8, characterized in that: The test bench (1) has a mounting plate (28) fixedly attached to its top surface. A ferrule (29) is fixedly attached to the top of the mounting plate (28). The ferrule (29) is fitted onto the outer periphery of the drive rod (24), and the inner ring of the ferrule (29) is rotatably connected to the drive rod (24) through a bearing (30).

10. The electric hoist testing device according to claim 1, characterized in that: Also includes: A support frame (31) is fixed to one side of the test bench (1). A guide wheel (32) is connected to the top of the support frame (31). The guide wheel (32) is set horizontally above the test bench (1). The length of the winding wheel (2) is less than the length of the guide wheel (32). The wire rope (3) slides in contact with the top of the guide wheel (32). The hook (4) extends vertically downward relative to the guide wheel (32).

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