Slewing driving system and engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a rotary driving system and engineering machinery, and the rotary driving system comprises a driving mechanism, two axial ends of which are respectively provided with an output shaft; the rotary speed reducer is connected with one output shaft of the driving mechanism; the electromagnetic brake is connected with the other output shaft of the driving mechanism; the driving mechanism is suitable for being vertically arranged in the engineering machine, and the electromagnetic brake is located above the rotary speed reducer. A built-in brake assembly is replaced by the electromagnetic brake with a simpler structure, so that the rotational inertia of the whole rotary driving system is reduced, the gravity center of the whole rotary driving system is reduced, the operation stability of the whole rotary driving system is improved, and the energy consumption is reduced. Due to the adoption of the electromagnetic brake, an existing hydraulic system can be omitted, and more energy conservation and environmental protection are achieved; and the electromagnetic brake is mounted above the rotary speed reducer, so that replacement of a friction plate in the electromagnetic brake in the later period is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a rotary drive system and engineering machinery. Background Art

[0002] As the rotary drive element of construction machinery, the slewing reducer plays a transmission role and is widely used in various construction machinery such as cranes and excavators.

[0003] The slewing reducer system needs to have a parking brake function. At present, the commonly used slewing reducer braking form is the reducer built-in brake assembly. The brake is opened by passing high-pressure hydraulic oil, and the high-pressure hydraulic oil is cut off after parking. However, the reducer system with a built-in brake assembly has a long overall size, which is not conducive to the stability of the overall system during high-speed slewing operation, and high-pressure hydraulic oil must be connected during operation, which is not conducive to energy saving. Utility Model Content

[0004] In view of this, the utility model provides a rotary drive system to solve the problem that the reducer system of the built-in brake assembly has a relatively long overall size, which is not conducive to the stability of the overall system during high-speed rotary operation, and high-pressure hydraulic oil must be connected during operation, which is not conducive to energy saving.

[0005] In a first aspect, the utility model provides a rotary drive system, comprising:

[0006] The driving mechanism has output shafts at both ends of the axial direction;

[0007] A rotary reducer connected to one of the output shafts of the drive mechanism;

[0008] an electromagnetic brake connected to the other output shaft of the driving mechanism;

[0009] The driving mechanism is suitable for being vertically arranged in an engineering machine, and the electromagnetic brake is located above the slewing reducer.

[0010] Beneficial effects: This solution uses a more streamlined electromagnetic brake to replace the built-in brake assembly, which reduces the rotational inertia of the entire slewing drive system, reduces the center of gravity of the entire slewing drive system, improves the running stability of the entire slewing drive system, and reduces energy consumption. In addition, due to the use of electromagnetic brakes, the existing hydraulic system can be eliminated, which is more energy-saving and environmentally friendly. Installing the electromagnetic brake above the slewing reducer facilitates the replacement of the friction plate in the electromagnetic brake in the later stage, improves the economy of maintenance and reduces the difficulty of maintenance.

[0011] In an optional embodiment, the driving mechanism, the rotary reducer and the electromagnetic brake are coaxially arranged.

[0012] Beneficial effects: The drive mechanism, slewing reducer and electromagnetic brake are coaxially arranged, which is convenient for installation on the one hand, and on the other hand, the whole is relatively stable and has a small moment of inertia when rotating at high speed.

[0013] In an optional embodiment, the driving mechanism includes a mounting shell, both ends of which are sealedly connected to the shell of the electromagnetic brake and the shell of the rotary reducer, respectively, and the output shafts at both ends of the driving mechanism are respectively located in the internal space of the sealed connection.

[0014] Beneficial effects: First, by installing the housing and the housing of the electromagnetic brake and the housing of the rotary reducer, the housing has a good overall structural integrity and better stability after the three are connected. By arranging rotating parts such as the output shaft in a sealed space, it plays a protective role and prevents external dust from entering.

[0015] In an optional embodiment, first flanges are respectively formed at both ends of the mounting shell, and second flanges are respectively formed on the shell of the electromagnetic brake and the shell of the rotary reducer, and the first flange and the second flange are connected by threaded fasteners to achieve a sealed connection between the driving mechanism and the electromagnetic brake and the rotary reducer, respectively.

[0016] Beneficial effects: In order to facilitate connection, first flanges are respectively set at both ends of the installation shell, and second flanges are respectively set on the shell of the electromagnetic brake and the shell of the rotary reducer. The three are quickly connected by connecting the first flange and the second flange. Installation and disassembly are convenient, and the flange structure is relatively simple to manufacture.

[0017] In an optional embodiment, the housing of the electromagnetic brake includes a first housing and a second housing which are arranged opposite to each other up and down, and the first housing is an integrated structure.

[0018] Beneficial effect: By setting the first shell as an integrated structure, the outdoor waterproofness of the electromagnetic brake is effectively improved, and the risk of failure of the electromagnetic brake due to water ingress is reduced.

[0019] In an optional embodiment, the first shell includes an annular body and the second flange arranged on the circumference of the annular body, and the annular body is provided with a cavity.

[0020] Beneficial effects: The annular body has a cavity, which is convenient for installing the internal components of the electromagnetic brake, and the first shell and the second shell can be easily connected by providing the second flange.

[0021] In an optional embodiment, the electromagnetic brake also includes a friction plate and a brake disc arranged in its housing, the friction plate includes a friction plate body and a spline sleeve arranged at the center of the friction plate body, the friction plate body is arranged on the second housing, and the brake disc is sleeved outside the spline sleeve and installed on the first housing; the brake disc is penetrated through its disc surface by a positioning spacer and passes through the positioning spacer through a fastener and is screwed on the first housing, the height of the brake disc is less than the height of the positioning spacer, and a tension spring is provided between the disc surface of the brake disc and the first housing.

[0022] Beneficial effects: the friction plate is arranged on the second shell, and the brake disc is arranged on the first shell. The two are arranged relative to each other for easy contact and disengagement. Due to the presence of the positioning sleeve, the highest position and the lowest position of the brake disc relative to the friction plate can be limited, and because the height of the brake disc is less than the height of the positioning sleeve, the brake disc has a certain activity space relative to the positioning sleeve. When it is in the lowest position, the bottom surface of the brake disc is flush with the bottom surface of the positioning sleeve. When it is in the highest position, the top surface of the brake disc is flush with the top surface of the positioning sleeve and is in contact with the first shell. When the electromagnetic brake loses power, the brake disc and the friction plate are tightly pressed against each other due to the force of the tension spring for braking. At this time, the brake disc is in the lowest position. When the electromagnetic brake is energized, the brake disc overcomes the spring force and moves upward to be in contact with the first shell. At this time, the brake disc is in the highest position. During the use of the friction plate, the friction plate will wear. When the friction plate is worn to the point that the brake disc is in the lowest position and can no longer contact the friction plate, the friction plate needs to be replaced. Therefore, by setting the positioning sleeve, guidance and reference are provided for the replacement timing of the friction plate.

[0023] In an optional embodiment, the second shell is provided with a central through hole and the second flange located at the periphery of the central through hole, and the output shaft of the driving mechanism is passed through the central through hole and connected to the spline sleeve.

[0024] Beneficial effects: The first housing and the second housing are arranged opposite to each other up and down, and the second housing is arranged below the first housing, so that the second housing is closer to the output shaft of the driving mechanism. By arranging a central through hole on the second housing, it is convenient for the output shaft to pass through the second housing and connect with the built-in spline sleeve. By arranging a second flange on the second housing, it is convenient for the electromagnetic brake to be connected with the first flange of the mounting housing through the second flange of the second housing, so that the electromagnetic brake is connected with the driving mechanism as a whole.

[0025] In an optional embodiment, a sealing gasket is provided between the first shell and the second shell, and the second shell is provided with a sealing gasket located outside the central through hole for sealingly connecting with the mounting shell.

[0026] Beneficial effects: By arranging a sealing gasket between the first shell and the second shell, the first shell and the second shell are conveniently sealed and connected, thereby enhancing the waterproof effect of the first shell and the second shell, and preventing rainwater from entering the shell from the gap between the first shell and the second shell. By arranging a sealing gasket between the second shell and the mounting shell, it is convenient to improve the waterproof effect between the electromagnetic brake and the drive mechanism. Since the second shell is provided with a central through hole, by arranging a sealing gasket outside the central through hole, it is possible to effectively prevent rainwater from entering the central through hole.

[0027] In a second aspect, the utility model further provides an engineering machine, comprising:

[0028] On the frame;

[0029] The above-mentioned slewing drive system is installed on the upper frame.

[0030] Beneficial effects: The engineering machinery of this scheme cancels the built-in brake assembly in the existing slewing drive system and replaces it with a simple electromagnetic drive, which greatly reduces the height of the overall structure, lowers the center of gravity, and improves the overall stability during the slewing process. In addition, the external electromagnetic brake is installed above the drive mechanism, that is, above the slewing reducer, which is convenient for the replacement of the friction plate in the electromagnetic brake in the later stage, and the overall moment of inertia is relatively small compared to the built-in brake assembly. At the same time, the high-pressure hydraulic oil injection during operation is cancelled, which has an energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of a rotary drive system of an embodiment of the utility model;

[0033] Figure 2 It is a schematic axial cross-sectional view of the electromagnetic brake in the embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Driving mechanism; 2. Rotary reducer; 3. Electromagnetic brake; 4. First flange; 5. Second flange; 6. First housing; 7. Second housing; 71. Center through hole; 8. Friction plate; 81. Spline sleeve; 9. Bolt; 10. Positioning spacer; 11. Fastener; 12. Sealing gasket; 13. Tension spring; 14. Brake disc. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] Aiming at the problem that the reducer system of the existing built-in brake assembly has a relatively long overall size, which is not conducive to the stability of the overall system during high-speed rotary operation, and high-pressure hydraulic oil must be connected during operation, which is not conducive to energy saving, the utility model proposes a rotary drive system and engineering machinery.

[0038] Combine the following Figure 1 to Figure 2 , describing an embodiment of the utility model.

[0039] According to an embodiment of the present utility model, on the one hand, as Figure 1 As shown, a rotary drive system is provided, which mainly includes a drive mechanism 1, a rotary reducer 2 and an electromagnetic brake 3.

[0040] Specifically, output shafts are respectively provided at two axial ends of the driving mechanism 1 , that is, the driving mechanism 1 is a double-output shaft structure.

[0041] Specifically, the rotary reducer 2 is connected to an output shaft of the driving mechanism 1 , and the specific connection method can adopt an existing connection method, such as directly connecting the first-stage sun gear of the rotary reducer 2 .

[0042] Specifically, the electromagnetic brake 3 is connected to another output shaft of the driving mechanism 1 , and the specific connection method will be further described below.

[0043] In this embodiment, the drive mechanism 1 is suitable for being vertically arranged in the engineering machinery, and the electromagnetic brake 3 is located above the rotary reducer 2. For the drive mechanism 1, the electromagnetic brake 3 is connected to the output shaft at the upper end of the drive mechanism 1, and the rotary reducer 2 is connected to the output shaft at the lower end of the drive mechanism 1.

[0044] In this embodiment, a more streamlined electromagnetic brake 3 is used to replace the built-in brake assembly, and the electromagnetic brake 3 is externally mounted, which reduces the rotational inertia of the entire slewing drive system, reduces the center of gravity of the entire slewing drive system, improves the running stability of the entire slewing drive system, and reduces energy consumption. In addition, due to the use of the electromagnetic brake 3, the existing hydraulic system can be eliminated, which is more energy-saving and environmentally friendly. The electromagnetic brake 3 is installed above the slewing reducer 2, which is convenient for Figure 2The friction plate 8 of the electromagnetic brake 3 is replaced, which improves the economy of maintenance and reduces the difficulty of maintenance.

[0045] like Figure 1 As shown, in a specific embodiment, the driving mechanism 1, the rotary reducer 2 and the electromagnetic brake 3 are coaxially arranged.

[0046] In this embodiment, the driving mechanism 1, the rotary reducer 2 and the electromagnetic brake 3 are coaxially arranged, which is convenient for installation on the one hand, and on the other hand, the whole is relatively stable and has a small moment of inertia when rotating at high speed.

[0047] In a specific embodiment, the driving mechanism 1 is a driving motor. The driving motor has a simple structure, and by providing a double-output shaft structure, the driving motor can be conveniently connected to the rotary reducer 2 and the electromagnetic brake 3 at the same time.

[0048] In a specific embodiment, the drive mechanism 1 includes a mounting shell, both ends of which are sealedly connected to the shell of the electromagnetic brake 3 and the shell of the rotary reducer 2, and the output shafts at both ends of the drive mechanism 1 are respectively located in the internal space of the sealed connection.

[0049] In this embodiment, first, the housing is installed and sealed to the housing of the electromagnetic brake 3 and the housing of the rotary reducer 2, so that the overall structural integrity and stability are good after the three are connected. By arranging rotating parts such as the output shaft in a sealed space, it plays a protective role and prevents external dust from entering.

[0050] like Figure 1 As shown, in a specific embodiment, first flanges 4 are respectively formed at both ends of the mounting shell, and second flanges 5 are respectively formed on the shell of the electromagnetic brake 3 and the shell of the rotary reducer 2, and the first flange 4 and the second flange 5 are connected by threaded fasteners. Specifically, the first flange 4 at one end of the mounting shell is connected to the second flange 5 of the shell of the electromagnetic brake 3 by bolts 9, and the first flange 4 at the other end of the mounting shell is connected to the second flange 5 of the shell of the rotary reducer 2 by bolts 9, so that the driving mechanism 1 is sealedly connected to the electromagnetic brake 3 and the rotary reducer 2 respectively.

[0051] In this embodiment, in order to facilitate connection, first flanges 4 are respectively provided at both ends of the mounting shell, and second flanges 5 are respectively provided on the shell of the electromagnetic brake 3 and the shell of the rotary reducer 2. The first flange 4 is connected with the second flange 5 to achieve quick connection of the three, which is convenient for installation and disassembly. In addition, the flange structure is relatively simple to manufacture and has high connection reliability.

[0052] In a specific embodiment, the electromagnetic brake 3 coil is turned on after 24V DC is passed through it, and brakes after the power is cut off.

[0053] like Figure 2 As shown, in a specific embodiment, the housing of the electromagnetic brake 3 includes a first housing 6 and a second housing 7 which are arranged opposite to each other up and down, and the first housing 6 is an integrated structure.

[0054] In this embodiment, by configuring the first housing 6 as an integrated structure, the outdoor waterproofness of the electromagnetic brake 3 is effectively improved, and the risk of failure of the electromagnetic brake 3 due to water ingress is reduced.

[0055] The first housing 6 and the second housing 7 are connected by bolts 9. When the friction plate 8 needs to be replaced, it is only necessary to remove the bolts 9, and then the first housing 6 can be disassembled as a whole to replace the friction plate 8. The structure is simple and easy to maintain later.

[0056] In a specific embodiment, the first shell 6 includes an annular body and a second flange 5 arranged on the circumferential side of the annular body. The annular body has an annular cavity for installing parts. The structure of the annular body + the second flange 5 is similar to a hat-type structure. The opening side of the first shell 6 is set downward and docked with the second shell 7. Since the outer surface of the "hat-type structure" is smooth and seamless, the structure has good integrity and good waterproof performance.

[0057] In this embodiment, a cavity is provided in the annular body, which is convenient for installing the internal components of the electromagnetic brake 3 . By arranging the second flange 5 around the annular body, the first shell 6 and the second shell 7 can be conveniently connected.

[0058] like Figure 2 As shown, in one embodiment, the electromagnetic brake 3 further includes a friction plate 8 and a brake disc 14 disposed in its housing, the friction plate 8 includes a friction plate 8 body and a spline sleeve 81 disposed at the center of the friction plate 8 body, the friction plate 8 body is disposed on the second housing 7, the brake disc 14 is sleeved outside the spline sleeve 81 and mounted on the first housing 6; the brake disc 14 is penetrated on its disc surface through a positioning sleeve 10 and penetrates the positioning sleeve 10 through a fastener 11 and is screwed on the first housing 6, the height of the brake disc 14 is less than the height of the positioning sleeve 10, and a tension spring 13 is disposed between the disc surface of the brake disc 14 and the first housing 6. During installation, one end of the positioning sleeve 10 abuts against the bottom surface of the first housing, and the other end of the positioning sleeve 10 abuts against the end of the fastener 11, and the fastener 11 may be a bolt.

[0059] In this embodiment, the friction plate 8 is arranged on the second housing 7, and the brake disc 14 is arranged on the first housing 6. The two are arranged relative to each other to facilitate contact and disengagement, thereby achieving braking and releasing the brake. Due to the presence of the positioning sleeve 10, the highest position and the lowest position of the brake disc 14 relative to the friction plate 8 can be limited, and because the height of the brake disc 14 is less than the height of the positioning sleeve 10, the brake disc 14 has a certain movable space relative to the positioning sleeve 10. When it is in the lowest position, the bottom surface of the brake disc 14 is flush with the bottom surface of the positioning sleeve 10. When it is in the highest position, the top surface of the brake disc 14 is flush with the top surface of the positioning sleeve 10 and is in contact with the bottom surface of the first housing 6. When the electromagnetic brake 3 loses power, the brake disc 14 is moved due to the force of the tension spring 13. 4 is in close contact with the friction plate 8 for braking. At this time, the brake disc 14 is in the lowest position. When the electromagnetic brake 3 is energized, the brake disc 14 overcomes the spring force (compression and tension spring 13) and moves upward to abut against the first housing 6. At this time, the brake disc 14 is in the highest position. During the use of the friction plate 8, the friction plate 8 will wear out. When the friction plate 8 is worn out to the point that the brake disc 14 is in the lowest position and can no longer contact with the friction plate 8, the staff can determine that the friction plate 8 needs to be replaced. Therefore, by setting the positioning spacer 10, guidance and reference are provided for the replacement timing of the friction plate 8.

[0060] As the name implies, the extension spring 13 is a spring that is in extension in its natural state.

[0061] In the above embodiment, it can be understood that the number of the positioning sleeves 10 can be multiple, and the multiple positioning sleeves 10 are arranged at intervals along the circumference of the brake disc 14. The number of the tension springs 13 can also be multiple, and the multiple tension springs 13 are staggered with the positioning sleeves 10. In order to improve the accuracy of the movement of the tension spring 13, a guide column can be set at the position where the tension spring 13 is set on the brake disc 14. Of course, the guide column can also be set on the bottom surface of the first housing 6, which is not specifically limited here.

[0062] Specifically, Figure 2 As shown, a friction plate 8 is provided in the electromagnetic brake 3, a spline sleeve 81 is provided in the center of the friction plate 8, and the friction plate 8 is clamped between the first shell 6 and the second shell 7. The spline sleeve 81 is located in the cavity of the annular body and is used to connect the output shaft on one side of the driving mechanism 1. It can be understood that a spline is provided on the output shaft. After the output shaft extends into the spline sleeve 81, the spline of the output shaft is matched and connected with the spline sleeve 81.

[0063] In a specific embodiment, the second housing 7 is provided with a central through hole 71 , and the output shaft of the driving mechanism 1 passes through the central through hole 71 and is connected to a spline sleeve 81 in the electromagnetic brake 3 .

[0064] In this embodiment, the first shell 6 and the second shell 7 are arranged opposite to each other in the upper and lower parts, and the second shell 7 is arranged below the first shell 6, so that the second shell 7 is closer to the output shaft of the driving mechanism 1. By setting a central through hole 71 on the second shell 7, it is convenient for the output shaft to pass through the second shell 7 and connect with the built-in spline sleeve 81.

[0065] In a specific embodiment, the second shell 7 is disc-shaped, and the second shell 7 is provided with a second flange 5 outside the central through hole 71 , and the second flange 5 of the second shell 7 is flange-connected with the first flange 4 of the mounting shell.

[0066] In this embodiment, by providing the second flange 5 on the second shell 7, the electromagnetic brake 3 is conveniently connected to the first flange 4 of the mounting shell through the second flange 5 of the second shell 7, thereby connecting the electromagnetic brake 3 and the drive mechanism 1 as a whole, and the connection is reliable.

[0067] In a specific embodiment, a sealing gasket 12 is provided between the first shell 6 and the second shell 7 , and a sealing gasket 12 for sealingly connecting with the mounting shell is provided outside the central through hole 71 of the second shell 7 .

[0068] In this embodiment, by providing a sealing gasket 12 between the first housing 6 and the second housing 7, the first housing 6 and the second housing 7 are conveniently sealed and connected, thereby enhancing the waterproof effect of the first housing 6 and the second housing 7, and preventing rainwater and the like from entering the housing interior through the gap between the first housing 6 and the second housing 7. By providing a sealing gasket 12 between the second housing 7 and the mounting housing, it is convenient to improve the waterproof effect between the electromagnetic brake 3 and the drive mechanism 1. Since the second housing 7 is provided with a central through hole 71, by providing a sealing gasket 12 outside the central through hole 71, it is possible to effectively prevent rainwater and the like from entering the central through hole 71.

[0069] On the other hand, the utility model also provides an engineering machine, which includes but is not limited to an excavator.

[0070] The engineering machinery includes:

[0071] On the frame;

[0072] The above-mentioned slewing drive system is installed on the upper frame. Specifically, the slewing drive system is vertically installed on the upper frame, the slewing reducer 2 is connected to the upper frame, and the electromagnetic brake 3 is located above the upper frame.

[0073] In this embodiment, the engineering machinery cancels the built-in brake assembly in the existing slewing drive system and replaces it with an electromagnetic driver with a simple structure, which greatly reduces the height of the overall structure, lowers the center of gravity, and improves the overall stability during the slewing process. It can be well applied even on excavators with higher slewing speeds. In addition, the external electromagnetic brake 3 is installed above the drive mechanism 1, that is, above the slewing reducer 2, which facilitates the replacement of the friction plate 8 in the electromagnetic brake 3 at a later stage, and the overall moment of inertia is relatively small compared to the built-in brake assembly. At the same time, the high-pressure hydraulic oil injection during operation is cancelled, which has an energy-saving effect.

[0074] The rotary drive system of this embodiment is a columnar structure as a whole, and the overall transportation and installation are relatively convenient.

[0075] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A rotary drive system, characterized in that: include: The driving mechanism (1) has output shafts at both axial ends; A rotary reducer (2) connected to one of the output shafts of the driving mechanism (1); An electromagnetic brake (3) connected to the other output shaft of the driving mechanism (1); The driving mechanism (1) is suitable for being vertically arranged in an engineering machine, and the electromagnetic brake (3) is located above the slewing reducer (2).

2. The slewing drive system according to claim 1, characterized in that: The driving mechanism (1), the rotary reducer (2) and the electromagnetic brake (3) are coaxially arranged.

3. The slewing drive system according to claim 1, characterized in that: The drive mechanism (1) comprises a mounting shell, the two ends of which are respectively sealedly connected to the shell of the electromagnetic brake (3) and the shell of the rotary reducer (2), and the output shafts at the two ends of the drive mechanism (1) are respectively located in the internal space of the sealed connection.

4. The slewing drive system according to claim 3, characterized in that: The two ends of the mounting shell are respectively formed with a first flange (4), the shell of the electromagnetic brake (3) and the shell of the rotary reducer (2) are respectively formed with a second flange (5), and the first flange (4) and the second flange (5) are connected by threaded fasteners to achieve a sealed connection between the drive mechanism (1) and the electromagnetic brake (3) and the rotary reducer (2), respectively.

5. The slewing drive system according to claim 4, characterized in that: The electromagnetic brake (3) comprises a first shell (6) and a second shell (7) which are arranged opposite to each other up and down, and the first shell (6) is an integrated structure.

6. The slewing drive system according to claim 5, characterized in that: The first shell (6) comprises an annular body and the second flange (5) arranged on the circumference of the annular body, and the annular body is provided with a cavity.

7. The slewing drive system according to claim 5, characterized in that: The electromagnetic brake (3) also includes a friction plate (8) and a brake disc (14) arranged in its housing, the friction plate (8) including a friction plate body and a spline sleeve (81) arranged at the center of the friction plate body, the friction plate body is arranged on the second housing (7), the brake disc (14) is sleeved outside the spline sleeve (81) and installed on the first housing (6); the brake disc (14) is inserted into its disc surface through a positioning sleeve (10) and passes through the positioning sleeve (10) through a fastener (11) and is screwed onto the first housing (6), the height of the brake disc (14) is less than the height of the positioning sleeve (10), and a tension spring (13) is provided between the disc surface of the brake disc (14) and the first housing (6).

8. The slewing drive system according to claim 7, characterized in that: The second housing (7) is provided with a central through hole (71) and the second flange (5) located on the outer periphery of the central through hole (71); the output shaft of the driving mechanism (1) passes through the central through hole (71) and is connected to the spline sleeve (81).

9. The slewing drive system according to claim 8, characterized in that: A sealing gasket (12) is provided between the first shell (6) and the second shell (7); the second shell (7) is provided with a sealing gasket (12) located outside the central through hole (71) for sealingly connecting with the mounting shell.

10. An engineering machine, characterized in that: include: On the frame; The slewing drive system according to any one of claims 1 to 9 is mounted on the upper frame.

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