A semi-direct drive structure

Abstract

The present invention provides a semi-direct drive dragging structure, which relates to the technical field of motors and includes a motor main body and a speed reducer. A variable-diameter shaft sleeve is provided in the motor main body. The variable-diameter shaft sleeve can be used to install output shafts of different diameters. The output shaft is connected to the speed reducer. The motor main body and the speed reducer are detachably connected. The variable-diameter shaft sleeve can be connected to output shafts of different diameters. The output shaft is equivalent to the driving shaft of the speed reducer, thus facilitating the connection of the motor main body to speed reducers of different models and solving the technical problems that when connecting speed reducers of different models, due to the different diameters of their driving shafts, it is necessary to replace the shaft sleeve inside the hollow motor with a shaft sleeve adapted to the driving shaft, which increases the cost and the replacement operation is cumbersome.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a semi-direct drive dragging structure. Background Art

[0002] The semi-direct drive dragging structure includes a speed reducer and a hollow motor. Among them, the driving shaft of the speed reducer extends into the motor, and is connected to the rotor support ring through a key on the shaft sleeve inside the motor. However, when connecting speed reducers of different models, due to the different diameters of their driving shafts, it is necessary to replace the shaft sleeve inside the hollow motor with a shaft sleeve adapted to the driving shaft, which increases the cost and the replacement operation is cumbersome. Summary of the Invention

[0003] The present invention provides a semi-direct drive dragging structure to solve the above-mentioned technical problem that when connecting speed reducers of different models, due to the different diameters of their driving shafts, it is necessary to replace the shaft sleeve inside the hollow motor with a shaft sleeve adapted to the driving shaft, which increases the cost and the replacement operation is cumbersome.

[0004] To solve the above technical problem, the present invention discloses a semi-direct drive dragging structure, including a motor main body and a speed reducer. A variable-diameter shaft sleeve is provided in the motor main body, and the variable-diameter shaft sleeve can be used to install output shafts of different diameters. The output shaft is connected to the speed reducer, and the motor main body and the speed reducer are detachably connected.

[0005] Preferably, the motor main body includes a housing. A lifting ring is provided at the upper end of the housing, a rear end cover is provided at the rear end of the housing, and a front end cover is provided at the front end of the housing. A plurality of bolt holes I are evenly distributed circumferentially on the front end cover, and the bolt holes I are arranged in one-to-one correspondence with a plurality of bolt holes II on the speed reducer. The bolt holes I and the bolt holes II are threadedly connected through fixing bolts. The housing and the rear end cover, and the front end cover are all threadedly connected through a plurality of bolts I arranged circumferentially. The housing, the rear end cover and the front end cover form a motor cavity.

[0006] Preferably, a stator is fixedly provided on the inner ring of the housing, and a rotor is correspondingly provided in the stator. The rotor is fixedly arranged in the installation groove.

[0007] Preferably, the installation groove is composed of a rotor support and a rotor plate. The installation groove is arranged on the outer side of the rotor support, and the rotor support and the rotor plate are threadedly connected through a plurality of bolts II arranged circumferentially.

[0008] Preferably, an installation hole penetrates through the middle of the rotor support, and the installation hole corresponds to and cooperates with the head of the variable-diameter shaft sleeve. A limiting groove is provided on the outer side of the head of the variable-diameter shaft sleeve, and a limiting block is provided in the limiting groove. The end of the variable-diameter shaft sleeve is threadedly connected to the rotor support through a plurality of bolts III arranged circumferentially.

[0009] Preferably, a retaining hole and a trapezoidal connecting hole penetrate through the middle of the stepped bushing. The diameter of the retaining hole is larger than that of the trapezoidal connecting hole. A plurality of first key grooves are communicated with the circumferential side of the trapezoidal connecting hole, and the specifications of the plurality of first key grooves are different. A second key groove is provided on one side of the output shaft, and a connecting key is correspondingly fitted between the first key groove and the second key groove.

[0010] Preferably, a bushing baffle is correspondingly provided in the retaining hole. The bushing baffle is threadedly connected with a fourth bolt, and the fourth bolt is threadedly connected with one end of the output shaft close to the trapezoidal connecting hole.

[0011] Preferably, a fitting hole and a bearing hole penetrate through the middle of the front end cover, and the motor cavity, the fitting hole and the bearing hole are communicated in sequence. The fitting hole is correspondingly fitted with the output shaft. A bearing isolator and a bearing are installed in the bearing hole, and the bearing isolator is arranged at one end of the bearing hole close to the fitting hole.

[0012] Preferably, the stepped bushing is further connected with a positioning mechanism. The positioning mechanism includes a positioning sleeve. The positioning sleeve is fixedly connected with the stepped bushing and rotatably connected with the front end cover. A cavity is provided inside the positioning sleeve. A plurality of convex blocks are evenly arranged circumferentially in the cavity. The plurality of convex blocks are correspondingly arranged with a plurality of contact blocks. The plurality of contact blocks are connected with a plurality of contact rods one by one. The plurality of contact rods are evenly arranged circumferentially at the side end of the fixed sleeve. The fixed sleeve is rotatably connected with the stepped bushing and fixedly connected with the front end cover. A spring is fixedly arranged between the contact block and the outside of the fixed sleeve. The spring is sleeved on the contact rod. A through hole is provided inside the fixed sleeve. The diameter of the through hole is larger than the maximum diameter of the trapezoidal connecting hole. One end of the contact rod far away from the contact block is fixedly connected with a connecting seat. The connecting seat is rotatably connected with a pressing wheel. The pressing wheel correspondingly contacts the output shaft.

[0013] Preferably, it further includes a connection monitoring method between the stepped bushing and the output shaft, including the following steps:

[0014] Step 1: Set an indicator light outside the housing;

[0015] Step 2: Set a rotational speed sensor on the output shaft for detecting the rotational speed of the output shaft;

[0016] Step 3: Electrically connect the rotational speed sensor and the indicator light through a controller;

[0017] Step 4: The controller calculates the theoretical shear coefficients of the connecting key, the first key groove and the second key groove according to the detection value of the rotational speed sensor and formula (1);

[0018] ; (1)

[0019] Wherein, is the theoretical shear coefficient of the connecting key, the first key groove and the second key groove, is the working power when the motor main body works, is the diameter of the output shaft, is the width of the connection key, is the length of the connection key, is the detected value of the rotational speed sensor, is the shear strength between keyway 1, keyway 2 and the connection key;

[0020] Step 5: The controller calculates the theoretical compressive coefficients of the connection key, keyway 1 and keyway 2 according to the detected value of the rotational speed sensor and formula (2);

[0021] ; (2)

[0022] wherein, is the theoretical shear coefficient of the connection key, keyway 1 and keyway 2, is the height of the connection key, is the compressive strength between keyway 1, keyway 2 and the connection key;

[0023] Step 6: The controller compares the calculated theoretical shear coefficient of the connection key with the preset shear coefficient, and the calculated theoretical compressive coefficient of the connection key with the preset compressive coefficient. If the calculated theoretical shear coefficient of the connection key is greater than the preset shear coefficient, and the calculated theoretical compressive coefficient of the connection key is greater than the preset compressive coefficient, the controller controls the indicator light to light up, indicating that the connection between keyway 1, keyway 2 and the connection key is stable, and the semi-direct drive dragging structure of the present application is in a normal working state.

[0024] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0025] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0026] Figure 1 is the structural schematic diagram of the present invention;

[0027] Figure 2 is the structural schematic diagram of the variable-diameter shaft sleeve connection of the present invention;

[0028] Figure 3 is the structural schematic diagram of the reducer connection of the present invention.

[0029] In the figure: 1, lifting ring; 2, rear end cover; 3, front end cover; 4, housing; 5, rotor bracket; 6, rotor plate; 7, bolt two; 8, bolt three; 9, bushing baffle; 10, bearing isolator; 11, stator; 12, rotor; 13, mating hole; 14, bearing hole; 15, limit groove; 16, trapezoidal connection hole; 17, hole stopper; 18, keyway one; 19, positioning sleeve; 20, cavity; 21, fixing sleeve; 22, connection seat; 23, contact block; 24, spring; 25, contact rod; 26, extrusion wheel; 27, output shaft; 28, keyway two; 29, bolt hole one; 30, speed reducer; 31, stepped bushing. Detailed implementation mode

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not specifically refer to the meaning of order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention provides the following embodiments

[0033] Embodiment 1

[0034] The embodiment of the present invention provides a semi-direct drive dragging structure, as Figures 1-3 shown, including a motor main body and a speed reducer 30. A stepped bushing 31 is provided in the motor main body. The stepped bushing 31 can be used to install output shafts 27 with different diameters. The output shaft 27 is connected to the speed reducer 30, and the motor main body and the speed reducer 30 are detachably connected;

[0035] The motor body includes a housing 4. A lifting ring 1 is provided at the upper end of the housing 4. A rear end cover 2 is provided at the rear end of the housing 4. A front end cover 3 is provided at the front end of the housing 4. A number of first bolt holes 29 are evenly distributed circumferentially on the front end cover 3. The first bolt holes 29 are arranged in one-to-one correspondence with a number of second bolt holes on the speed reducer 30. The first bolt holes 29 and the second bolt holes are threadedly connected through fixing bolts. The housing 4 is threadedly connected to the rear end cover 2 and the front end cover 3 through a number of circumferentially arranged first bolts. The housing 4, the rear end cover 2 and the front end cover 3 form a motor cavity;

[0036] An inner ring of the housing 4 is fixedly provided with a stator 11. A rotor 12 is correspondingly provided in the stator 11. The rotor 12 is fixedly arranged in an installation groove.

[0037] The beneficial effects of the above technical solution are as follows:

[0038] The first bolt holes 29, the second bolt holes and the fixing bolts realize the detachable connection between the motor body and the speed reducer 30. The front end cover 3, the rear end cover 2 and the housing 4 are threadedly connected through a number of first bolts, which is convenient for installation and disassembly, and also convenient for overhaul and maintenance of the stator 11, the rotor 12 and the stepped bushing 31 in the motor cavity. The stepped bushing 31 can be connected to output shafts 27 with different diameters. The output shaft 27 is equivalent to the driving shaft of the speed reducer. Thus, it is convenient for the motor body to be connected to speed reducers 30 of different models, solving the technical problems that when connecting speed reducers of different models, due to the different diameters of their driving shafts, the bushing inside the hollow motor needs to be replaced with a bushing adapted to the driving shaft, increasing the cost and making the replacement operation cumbersome.

[0039] Embodiment 2

[0040] On the basis of Embodiment 1, as Figures 1-3 shown, the installation groove is composed of a rotor bracket 5 and a rotor plate 6. The installation groove is arranged on the outside of the rotor bracket 5. The rotor bracket 5 and the rotor plate 6 are threadedly connected through a number of circumferentially arranged second bolts 7;

[0041] A mounting hole runs through the middle of the rotor bracket 5. The mounting hole corresponds to and cooperates with the head of the stepped bushing 31. A limiting groove 15 is provided on the outside of the head of the stepped bushing 31. A limiting block is provided in the limiting groove 15. The end of the stepped bushing 31 is threadedly connected to the rotor bracket 5 through a number of circumferentially arranged third bolts 8;

[0042] A retaining hole 17 and a trapezoidal connecting hole 16 run through and communicate with the middle of the stepped bushing 31. The diameter of the retaining hole 17 is larger than that of the trapezoidal connecting hole 16. A number of first key grooves 18 are communicated with the circumferential side of the trapezoidal connecting hole 16. The specifications of the number of first key grooves 18 are different. A key groove 28 is provided on one side of the output shaft 27. A connecting key is correspondingly arranged between the first key grooves 18 and the key groove 28;

[0043] A bushing baffle 9 is correspondingly provided in the retaining hole 17. The bushing baffle 9 is threadedly connected to the fourth bolt, and the fourth bolt is threadedly connected to one end of the output shaft 27 close to the trapezoidal connection hole 16.

[0044] A mating hole 13 and a bearing hole 14 penetrate through the middle of the front end cover 3 and are connected in communication. The motor cavity, the mating hole 13, and the bearing hole 14 are connected in sequence. The mating hole 13 is correspondingly mated with the output shaft 27. A bearing isolator 10 and a bearing are installed in the bearing hole 14, and the bearing isolator 10 is arranged at one end of the bearing hole 14 close to the mating hole 13.

[0045] The beneficial effects of the above technical solutions are as follows:

[0046] The rotor bracket 5 and the rotor plate 6 form an installation groove, and the rotor 12 is installed. The rotor bracket 5 is connected to the stepped bushing 31 through the third bolt 8, which is convenient for installation and disassembly. When the rotor 12 rotates, it can drive the stepped bushing 31 to rotate through the rotor bracket 5. The trapezoidal connection hole 16 in the stepped bushing 31 can limit the contact with output shafts 27 of different diameters, and key grooves 18 of different specifications are arranged inside the trapezoidal connection hole 16. When the output shaft 27 abuts against the trapezoidal connection hole 16 during the process of moving into the trapezoidal connection hole 16, a connection key is inserted between the key groove 18 corresponding to the key groove 28 on the output shaft 27 and the key groove 28 at this time to complete the connection and fixation of the output shaft 27 of different diameters and the stepped bushing 31. The setting of the bushing baffle 9 is threadedly connected to the output shaft 27 through the fourth bolt, so that the output shaft 27 cannot move away from the trapezoidal connection hole 16, thereby making the connection between the output shaft 27 and the stepped bushing 31 more stable, and the bearing in the bearing hole 14 is adapted to the output shaft 27.

[0047] Embodiment 3

[0048] On the basis of Embodiment 2, as Figures 1-3 shown, the stepped bushing 31 is also connected to a positioning mechanism. The positioning mechanism includes a positioning sleeve 19. The positioning sleeve 19 is fixedly connected to the stepped bushing 31. The positioning sleeve 19 is rotatably connected to the front end cover 3. A cavity 20 is provided inside the positioning sleeve 19. A number of convex blocks are evenly distributed circumferentially in the cavity 20. The number of convex blocks is correspondingly arranged with a number of contact blocks 23. The number of contact blocks 23 is connected to a number of contact rods 25 one by one. The number of contact rods 25 is evenly distributed circumferentially at the side end of the fixed sleeve 21. The fixed sleeve 21 is rotatably connected to the stepped bushing 31. The fixed sleeve 21 is fixedly connected to the front end cover 3. A spring 24 is fixedly arranged between the contact block 23 and the outside of the fixed sleeve 21. The spring 24 is sleeved on the contact rod 25. A through hole is provided inside the fixed sleeve 21. The diameter of the through hole is larger than the maximum diameter of the trapezoidal connection hole 16. One end of the contact rod 25 away from the contact block 23 is fixedly connected to a connecting seat 22. The connecting seat 22 is rotatably connected to a pressing wheel 26. The pressing wheel 26 is correspondingly in contact with the output shaft 27.

[0049] The beneficial effects of the above technical solution are as follows:

[0050] When the rotor 12 drives the variable-diameter shaft sleeve 31 to rotate, the positioning sleeve 19 rotates when the variable-diameter shaft sleeve 31 rotates. When the positioning sleeve 19 rotates, the convex block in its cavity 20 rotates. When the convex block contacts the contact block 23, it pushes the contact block 23 to move in the direction of the trapezoidal connection hole 16. The contact block 23 drives the connection seat 22 to move through the contact rod 25. The connection seat 22 drives the extrusion wheel 26 to move, compressing the spring 24. The extrusion wheel 26 extrudes the output shaft 27, further improving the connection stability between the output shaft 27 and the variable-diameter shaft sleeve 31 during rotation. Moreover, the setting of the spring 24 can improve the stability of the output shaft 27 during rotation and prevent the amplitude of the output shaft 27 from being too large.

[0051] Embodiment 4

[0052] On the basis of Embodiment 3, a control system for a semi-direct drive dragging structure further includes a connection monitoring method between the variable-diameter shaft sleeve 31 and the output shaft 27, which includes the following steps:

[0053] Step 1: Set an indicator light outside the housing 4;

[0054] Step 2: Set a rotational speed sensor on the output shaft 27 for detecting the rotational speed of the output shaft 27;

[0055] Step 3: Electrically connect the rotational speed sensor and the indicator light through a controller;

[0056] Step 4: The controller calculates the theoretical shear coefficient of the connection key, keyway one 18, and keyway two 28 according to the detection value of the rotational speed sensor and formula (1);

[0057] ; (1)

[0058] Wherein, is the theoretical shear coefficient of the connection key, keyway one 18, and keyway two 28, is the working power when the motor main body is working, is the diameter of the output shaft 27, is the width of the connection key, is the length of the connection key, is the detection value of the rotational speed sensor, is the shear strength between keyway one 18, keyway two 28, and the connection key;

[0059] Step 5: The controller calculates the theoretical compressive coefficient between the connection key, keyway one 18, and keyway two 28 according to the detection value of the rotational speed sensor and formula (2);

[0060] ; (2)

[0061] Among them, is the theoretical shear coefficient of the connecting key, keyway 18 and keyway 28, is the height of the connecting key, is the compressive strength between keyway 18, keyway 28 and the connecting key;

[0062] Step 6: The controller compares the calculated theoretical shear coefficient and the preset shear coefficient of the connecting key, and the calculated theoretical compressive coefficient and the preset compressive coefficient of the connecting key. If the calculated theoretical shear coefficient of the connecting key is greater than the preset shear coefficient and the calculated theoretical compressive coefficient of the connecting key is greater than the preset compressive coefficient, the controller controls the indicator light to shine, indicating that the connection between keyway 18, keyway 28 and the connecting key is stable, and the semi-direct drive dragging structure of the present application is in a normal working state.

[0063] The technical effects of the above solution are:

[0064] It also includes a connection monitoring method between the stepped shaft sleeve 31 and the output shaft 27, including the following steps: An indicator light is set outside the housing 4; A rotational speed sensor is set on the output shaft 27 for detecting the rotational speed of the output shaft 27; The rotational speed sensor and the indicator light are electrically connected through the controller; The controller calculates the theoretical shear coefficient of the connecting key, keyway 18 and keyway 28 according to the detected value of the rotational speed sensor and formula (1) (the theoretical shear coefficient is the ratio of the shear strength and shear stress between the connecting key, keyway 18 and keyway 28. If the shear stress between the connecting key, keyway 18 and keyway 28 is greater than the shear strength, it means there is a risk of deformation between the connecting key, keyway 18 and keyway 28, and the connection is unstable); The controller calculates the theoretical compressive coefficient between the connecting key, keyway 18 and keyway 28 according to the detected value of the rotational speed sensor and formula (2) (the theoretical compressive coefficient is the ratio of the compressive strength and pressure between the connecting key, keyway 18 and keyway 28. If the pressure between the connecting key, keyway 18 and keyway 28 is greater than the compressive strength, it means there is a risk of deformation between the connecting key, keyway 18 and keyway 28, and the connection is unstable); The controller compares the calculated theoretical shear coefficient and the preset shear coefficient of the connecting key, and the calculated theoretical compressive coefficient and the preset compressive coefficient of the connecting key. If the calculated theoretical shear coefficient of the connecting key is greater than the preset shear coefficient and the calculated theoretical compressive coefficient of the connecting key is greater than the preset compressive coefficient, the controller controls the indicator light not to shine, indicating that the connection between keyway 18, keyway 28 and the connecting key is stable, and the semi-direct drive dragging structure of the present application is in a normal working state. If the calculated theoretical shear coefficient of the connecting key is less than the preset shear coefficient and the calculated theoretical compressive coefficient of the connecting key is less than the preset compressive coefficient, and the values of the preset compressive coefficient and the preset shear coefficient are 1, the controller controls the indicator light to shine, indicating that the connection between keyway 18, keyway 28 and the connecting key is unstable and the connecting key needs to be replaced.

[0065] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A semi-direct drive drag structure, characterized in that: The motor body comprises a motor main body and a reducer (30), wherein a reducing sleeve (31) is provided in the motor main body, and the reducing sleeve (31) can be used to install output shafts (27) of different diameters, and the output shaft (27) is connected to the reducer (30), and the motor main body and the reducer (30) are detachably connected; The motor body comprises a housing (4), the inner ring of the housing (4) is fixedly provided with a stator (11), the stator (11) is correspondingly provided with a rotor (12), and the rotor (12) is fixedly arranged in the mounting groove; The mounting groove is composed of a rotor support (5) and a rotor plate (6), the mounting groove is arranged on the outer side of the rotor support (5), and the rotor support (5) and the rotor plate (6) are threadedly connected by a plurality of bolts (7) arranged in the circumferential direction; A mounting hole is provided through the middle of the rotor support (5), the mounting hole correspondingly matching with the head of the reducing shaft sleeve (31), a limiting groove (15) is provided outside the head of the reducing shaft sleeve (31), a limiting block is provided in the limiting groove (15), and the end of the reducing shaft sleeve (31) is threadedly connected to the rotor support (5) via a plurality of bolts (8) arranged in the circumferential direction; A blocking hole (17) and a trapezoidal connecting hole (16) are connected through the middle of the reducing sleeve (31); the blocking hole (17) has a diameter greater than that of the trapezoidal connecting hole (16); a plurality of key slots (18) are connected around the trapezoidal connecting hole (16); the specifications of the plurality of key slots (18) are different; a key slot (28) is provided on one side of the output shaft (27); a connecting key is provided between the key slot (18) and the key slot (28); Also included is a method for monitoring the connection between the reducer sleeve (31) and the output shaft (27), comprising the following steps: Step 1: Arrange an indicator light on the outside of the housing (4); Step 2: A rotation speed sensor is provided on the output shaft (27) to detect the rotation speed of the output shaft (27); Step 3: Electrically connect the speed sensor and the indicator light through the controller; Step 4: The controller calculates the theoretical shear coefficients of the connecting key, keyway 1 (18) and keyway 2 (28) according to the detection value of the speed sensor and formula (1); ；（1） in, is the theoretical shear coefficient of the connecting key, keyway 1 (18) and keyway 2 (28), is the working power of the motor body when it is working, is the diameter of the output shaft (27), is the width of the connection key, is the length of the connecting key, is the detection value of the speed sensor, is the shear strength between keyway 1 (18), keyway 2 (28) and the connecting key; Step 5: The controller calculates the theoretical compression coefficient of the connecting key, keyway 1 (18) and keyway 2 (28) according to the detection value of the speed sensor and formula (2); ；（2） in, is the theoretical compressive strength coefficient of the connecting key, keyway 1 (18) and keyway 2 (28), is the height of the connection key, is the compressive strength between keyway 1 (18), keyway 2 (28) and the connecting key; Step 6: The controller compares the calculated theoretical shear coefficient of the connecting key with the preset shear coefficient, and the theoretical compressive coefficient of the connecting key with the preset compressive coefficient. If the calculated theoretical shear coefficient of the connecting key is greater than the preset shear coefficient, and the theoretical compressive coefficient of the connecting key is greater than the preset compressive coefficient, the controller controls the indicator light to light up, indicating that the connection between key slot one (18), key slot two (28) and the connecting key is stable, and the semi-direct drive drag structure is in normal working condition.

2. A semi-direct drive drag structure according to claim 1, characterized in that: A lifting ring (1) is provided at the upper end of the housing (4), a rear end cover (2) is provided at the rear end of the housing (4), a front end cover (3) is provided at the front end of the housing (4), a plurality of bolt holes (29) are evenly distributed circumferentially on the front end cover (3), the bolt holes (29) are arranged in a one-to-one correspondence with the plurality of bolt holes (2) on the reducer (30), the bolt holes (29) and the bolt holes (2) are threadedly connected by fixing bolts, the housing (4) and the rear end cover (2) and the front end cover (3) are threadedly connected by a plurality of bolts (1) arranged circumferentially, and the housing (4), the rear end cover (2) and the front end cover (3) form a motor cavity.

3. A semi-direct drive drag structure according to claim 1, characterized in that: A shaft sleeve baffle (9) is correspondingly arranged in the baffle hole (17), the shaft sleeve baffle (9) is threadedly connected to bolt No. 4, and bolt No. 4 is threadedly connected to one end of the output shaft (27) close to the trapezoidal connecting hole (16).

4. A semi-direct drive drag structure according to claim 2, characterized in that: A matching hole (13) and a bearing hole (14) are connected through the middle of the front end cover (3), and the motor cavity, the matching hole (13) and the bearing hole (14) are connected in sequence. The matching hole (13) matches the output shaft (27) correspondingly. A bearing isolator (10) and a bearing are installed in the bearing hole (14), and the bearing isolator (10) is arranged at one end of the bearing hole (14) close to the matching hole (13).

5. A semi-direct drive drag structure according to claim 2, characterized in that: The reducing shaft sleeve (31) is also connected to a positioning mechanism, the positioning mechanism comprising a positioning sleeve (19), the positioning sleeve (19) being fixedly connected to the reducing shaft sleeve (31), the positioning sleeve (19) being rotatably connected to the front end cover (3), a cavity (20) being provided inside the positioning sleeve (19), a plurality of protrusions being evenly arranged in the circumferential direction of the cavity (20), the plurality of protrusions being correspondingly arranged to the plurality of contact blocks (23), the plurality of contact blocks (23) being connected to the plurality of contact rods (25) in a one-to-one correspondence, the plurality of contact rods (25) being evenly arranged in the circumferential direction at the side ends of the fixing sleeve (21), the fixing sleeve (21) being connected to the reducing shaft sleeve (31), and the fixing sleeve (21) being connected to the reducing shaft sleeve (31). The radial sleeve (31) is rotatably connected, the fixed sleeve (21) is fixedly connected to the front end cover (3), a spring (24) is fixedly provided between the contact block (23) and the outside of the fixed sleeve (21), the spring (24) is sleeved on the contact rod (25), a through hole is provided inside the fixed sleeve (21), the diameter of the through hole is larger than the maximum diameter of the trapezoidal connecting hole (16), one end of the contact rod (25) away from the contact block (23) is fixedly connected to the connecting seat (22), the connecting seat (22) is rotatably connected to the extrusion wheel (26), and the extrusion wheel (26) is in corresponding contact with the output shaft (27).

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