Improved structure of main shaft of grinding machine

Abstract

The utility model relates to an improved structure of a grinding machine main shaft, which comprises a shell, a mandrel, a grinding wheel group, a wireless power supply component and a vibration component, the mandrel is rotatably arranged in the shell, the wireless power supply component comprises an electromagnetic conversion piece and a circuit arrangement seat, the electromagnetic conversion piece is fixed on the shell and can generate a magnetic field by being electrified through a power supply interface, and the circuit arrangement seat is arranged on the shell. The magnetoelectric conversion piece is arranged between one end of the mandrel and the electromagnetic conversion piece and rotates synchronously with the mandrel, the vibration assembly is provided with an actuating piece, the actuating piece is electrically connected with the magnetoelectric conversion piece, the grinding wheel set is arranged at the other end of the mandrel and connected with the actuating piece, and when the grinding wheel set is driven by the mandrel to rotate and machine a workpiece, the grinding wheel set is driven by the mandrel to rotate. The magnetoelectric conversion piece induces changes of a magnetic field generated by the electromagnetic conversion piece to generate induced voltage, and therefore the actuating piece is driven to drive the grinding wheel set to vibrate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a grinding machine, especially a grinding machine spindle improved structure. BACKGROUND

[0002] The grinding machine drives the grinding wheel to rotate through the spindle, thereby grinding the workpiece. Some existing grinding machines apply ultrasonic vibration technology to the spindle to assist processing. By driving the grinding wheel to vibrate at high speed and a small amplitude, the grinding wheel repeatedly collides with the workpiece, effectively reducing the processing resistance, thereby improving the processing efficiency and reducing the wear of the grinding wheel.

[0003] The existing grinding machine applying ultrasonic vibration usually sets the vibration component generating ultrasonic vibration in the spindle to connect the grinding wheel and sets the conductive brush around the spindle. The conductive brush transmits voltage between the fixed base and the rotating spindle. However, since the spindle rotates at high speed during processing, the conductive brush may be quickly consumed and high temperature, electric spark, and other conditions may occur, resulting in limited spindle speed of the existing grinding machine applying ultrasonic vibration and insufficient processing accuracy. SUMMARY

[0004] To solve the problem of limited spindle speed and insufficient processing accuracy of the existing grinding machine applying ultrasonic vibration due to the use of conductive brush to conduct current, the utility model aims to provide a grinding machine spindle improved structure that transmits electricity between fixed and rotating components through electromagnetic induction to drive the vibration assembly, thereby maintaining high-speed grinding machine spindle.

[0005] The grinding machine spindle improved structure provided by the utility model includes:

[0006] A housing is provided with a power supply interface;

[0007] A spindle is rotatably arranged in the housing and includes a first end and a second end opposite to each other;

[0008] A grinding wheel assembly is arranged at the second end of the spindle and can be driven by the spindle to rotate relative to the housing;

[0009] A wireless power supply assembly is arranged between the first end of the spindle and the power supply interface and includes

[0010] An electromagnetic conversion member is fixed to the housing and electrically connected to the power supply interface. The electromagnetic conversion member can generate a magnetic field by being powered through the power supply interface; and

[0011] A magneto-electric conversion member is arranged between the electromagnetic conversion member and the spindle and rotates synchronously with the spindle. The magneto-electric conversion member can generate an induced voltage with the change of the magnetic field generated by the electromagnetic conversion member; and

[0012] a vibration assembly, disposed at the second end of the spindle, and comprising

[0013] at least one actuating member, connected to the grinding wheel set and electrically connected to the magneto-electric conversion member, the actuating member being made of piezoelectric material, so as to be driven by the induced voltage to stretch and contract along the axial direction of the spindle, thereby driving the grinding wheel set to vibrate.

[0014] The technical means of the utility model can obtain the following effects: compared with the existing ultrasonic vibration grinding machine which uses a conductive brush to conduct current, the grinding machine spindle improvement structure of the utility model generates a magnetic field through power supply to the electromagnetic conversion member fixed in the shell, and the magneto-electric conversion member senses the change of the magnetic field generated by the electromagnetic conversion member, thereby generating an induced voltage to drive the actuating member, so as to drive the grinding wheel set to vibrate. In this way, the current can be conducted in a non-contact manner between the fixed and rotating components, the spindle can maintain high speed without high temperature, electric spark and other doubts, the vibration can be used to reduce the machining resistance and reduce the wear of the grinding wheel set, and the machining precision can be maintained. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the preferred embodiment of the utility model.

[0016] Figure 2 It is an exploded view of the wireless power supply assembly of the preferred embodiment of the utility model.

[0017] Figure 3 It is an exploded view of the vibration assembly and the grinding wheel set of the preferred embodiment of the utility model.

[0018] Figure 4 It is a side view of the preferred embodiment of the utility model.

[0019] Figure 5 It is a partial enlarged view of Figure 4 .

[0020] Figure 6 It is another partial enlarged view of Figure 4 .

[0021] Figure 7 It is a block diagram of power-on and electromagnetic induction of the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to understand the technical features and practical effects of the utility model in detail, and to realize the content of the utility model, the preferred embodiment shown in the drawings is described in detail as follows:

[0023] AsFigures 1 to 3 As shown, the preferred embodiment of the improved structure of the grinder spindle comprises an axial direction, an outer shell 10, a spindle 20, a wireless power supply assembly 30, a vibration assembly 40 and a grinding wheel set 50. The spindle 20 is rotatably arranged in the outer shell 10 to drive the grinding wheel set 50 to rotate relative to the outer shell 10. The wireless power supply assembly 30 is used to energize the vibration assembly 40, thereby driving the vibration assembly 40 to drive the grinding wheel set 50 to vibrate relative to the spindle 20.

[0024] As shown, Figures 1 to 3 The outer shell 10 is a protective structure of the outer ring of the improved structure of the grinder spindle. According to the preferred embodiment of the present application, the outer shell 10 specifically comprises a bushing 11, a rear cover 12, a front cover 13 and a bearing seat 14. The bushing 11 is an intermediate section of the outer shell 10. The rear cover 12 and the front cover 13 are respectively located at both ends of the outer shell 10. The bearing seat 14 is fixed to one end of the bushing 11, and the rear cover 12 is fixed to the bearing seat 14. The front cover 13 is fixed to the other end of the bushing 11, forming a closed structure to protect the internal components such as the spindle 20 and the wireless power supply assembly 30.

[0025] As shown, Figure 1 The outer shell 10 at the rear cover 12 specifically comprises a power supply interface 101, an encoder interface 102 and a spindle interface 103. The power supply interface 101 can supply power to the wireless power supply assembly 30. The encoder interface 102 is used to electrically connect an encoder to detect the rotation amount, position and other information of the spindle 20. The spindle interface 103 is electrically connected to a rotor coil (not shown) of the spindle 20 to drive the spindle 20 to drive the grinding wheel set 50 to rotate.

[0026] As shown, Figures 2 to 4 The spindle 20 comprises a first end and a second end opposite to each other. The spindle 20 extends in the bushing 11, and the bushing 11 is provided with a plurality of bearings to support the spindle 20. The first end of the spindle 20 extends into the rear cover 12, and the second end of the spindle 20 extends into the front cover 13 and is connected with the grinding wheel set 50.

[0027] As shown, Figure 2 , Figure 4 , Figure 5 and Figure 7As shown, the wireless power supply component 30 is disposed inside the back cover 12 of the housing 10 and is located between the first end of the spindle 20 and one of the power supply interfaces 101 of the housing 10. The wireless power supply component 30 includes an electromagnetic converter 31A and a magnetoelectric converter 31B. The electromagnetic converter 31A is fixed to the back cover 12 of the housing 10 and is electrically connected to the power supply interface 101, so that the electromagnetic converter 31A can generate a magnetic field by being energized through the power supply interface 101.

[0028] like Figure 2 , Figure 4 and Figure 5 As shown, the magnetoelectric conversion element 31B is disposed between the first end of the spindle 20 and the electromagnetic conversion element 31A, and can rotate synchronously with the spindle 20. The magnetoelectric conversion element 31B is disposed adjacent to the electromagnetic conversion element 31A, thereby being located within the range of influence of the magnetic field generated by the electromagnetic conversion element 31A. The magnetoelectric conversion element 31B can generate an induced voltage as the magnetic field generated by the electromagnetic conversion element 31A changes, and can drive the vibration component 40 to operate with the induced voltage.

[0029] like Figure 3 , Figure 4 and Figure 6 As shown, the vibration assembly 40 is located at the second end of the spindle 20 and includes at least one actuator 41, such as... Figures 4 to 7 As shown, the actuator 41 is connected to the grinding wheel assembly 50 and electrically connected to the magnetoelectric converter 31B, thereby the induced voltage generated by the magnetoelectric converter 31B can be transmitted to the actuator 41 to drive the actuator 41.

[0030] like Figure 3 , Figure 4 and Figure 6 As shown in the preferred embodiment of this utility model, the grinding wheel set 50 specifically includes a grinding wheel 51 and a grinding wheel seat 52. The grinding wheel seat 52 is inserted through several bolts and locked to the second end of the spindle 20. The grinding wheel seat 52 can be rotated by the spindle 20. At the same time, there is a margin between the grinding wheel seat 52 and the bolts locked to the spindle 20. The grinding wheel seat 52 is fixed to the vibration component 40, so that it can be driven by the vibration component 40 to vibrate slightly relative to the spindle 20. The grinding wheel 51 is fixed to the grinding wheel seat 52 by bolts. During processing, the grinding wheel 51 contacts the workpiece to perform grinding operations.

[0031] The specific operation of the improved grinding machine spindle structure of this utility model is as follows: Power is connected to the spindle interface 103, which drives the aforementioned rotor coil to rotate the spindle 20 at high speed, thereby driving the grinding wheel assembly 50 to rotate and perform grinding operations. Figure 7At the same time, the power supply interface 101 is connected to the power supply, and the electromagnetic conversion member 31A is powered.

[0032] The electromagnetic conversion member 31A is annular, and specifically includes a shell, a wire 311, and a ferrite core. The wire 311 of the electromagnetic conversion member 31A extends from the power supply interface 101 to the inside of the shell through the hole formed in the rear cover 12, and is wound around the ferrite core in the axial direction. In this way, when current flows through the wire 311 of the electromagnetic conversion member 31A, a magnetic field M in the axial direction is generated, and the stability and strength of the magnetic field M are enhanced by the ferrite core. In other embodiments, the wire can be simply wound into a coil, or wound around a member made of other ferromagnetic material, without being limited to the preferred embodiment of the utility model.

[0033] The specific structure of the magnetoelectric conversion member 31B is substantially the same as that of the electromagnetic conversion member 31A, and is also annular, and includes a shell, a wire 311, and a ferrite core. The wire 311 of the magnetoelectric conversion member 31B is also wound around the ferrite core in the axial direction. When the magnetic field of the wire 311 and the ferrite core of the magnetoelectric conversion member 31B changes, the wire 311 of the magnetoelectric conversion member 31B can correspondingly generate an induced voltage.

[0034] The electromagnetic conversion member 31A is connected to the alternating current through the power supply interface 101. The current flowing through the wire 311 of the electromagnetic conversion member 31A constantly changes direction, so that the magnetic field M generated by the electromagnetic conversion member 31A constantly changes direction correspondingly. In this way, the wire 311 of the magnetoelectric conversion member 31B generates an induced voltage in response to the change of the magnetic field M. The induced voltage can be transmitted to the actuator 41, so that the actuator 41 can drive the grinding wheel set 50 to vibrate relative to the mandrel 20.

[0035] Specifically, the actuator 41 is made of piezoelectric material, which can be piezoelectric crystal such as quartz, or piezoelectric ceramic. When the induced voltage generated by the magnetoelectric conversion member 31B is applied to the actuator 41, the actuator 41 will constantly stretch and deform along the axial direction of the mandrel 20, i.e. the inverse piezoelectric effect of piezoelectric material. In this way, the grinding wheel set 50 can repeatedly collide with the workpiece while rotating and grinding the workpiece at high speed and with slight vibration, achieving the effect of ultrasonic vibration, reducing the resistance of grinding processing, and avoiding the adhesion of grinding dust on the grinding wheel set 50, thereby reducing the wear of the grinding wheel set 50 and the production cost.

[0036] Compared with the existing ultrasonic vibration grinding machine using a conductive brush to conduct current, in order to avoid high temperature and electric spark doubts, the main shaft speed cannot be improved, and the machining precision is limited. The improved structure of the grinding machine spindle of the utility model, the electromagnetic conversion piece 31A fixed in the shell 10 is electrified to generate a magnetic field M, and the magneto-electric conversion piece 31B rotates synchronously with the mandrel 20, generates an induced voltage by sensing the change of the magnetic field M generated by the electromagnetic conversion piece 31A, drives the actuator 41 of the vibration assembly 40 to drive the grinding wheel set 50 to vibrate, thereby, the electric conduction between the fixed and rotating components can be realized by electromagnetic induction in a non-contact manner, the mandrel 20 can maintain high speed without high temperature, electric spark and other doubts, the utility model can reduce the machining resistance and the abrasion of the grinding wheel set 50 by vibration, and the machining precision can be maintained.

[0037] Preferably, as shown in Figure 3 、 Figure 4 and Figure 6 , the vibration assembly 40 comprises a plurality of actuators 41, the plurality of actuators 41 are arranged in the axial direction of the mandrel 20, specifically, the user can determine the actual number of the plurality of actuators 41 according to the size of the mandrel 20 and the grinding wheel set 50, the rotation speed of the mandrel 20, the strength of the workpiece to be machined and other related factors, so as to form the required vibration mechanism, and achieve the effect of reducing the abrasion of the grinding wheel set 50 and reducing the production cost.

[0038] Further, as shown in Figure 3 and Figure 6 , the vibration assembly 40 further comprises a limiting cover 42 and a bolt 44, each actuator 41 is annular and has a shaft hole in the center, the grinding wheel seat 52 is provided with a connecting hole 521 in the axial direction, the bolt 44 passes through the connecting hole 521 and the shaft holes of the plurality of actuators 41 and is screw-coupled to the limiting cover 42, so that the plurality of actuators 41 are limited between the limiting cover 42 and the grinding wheel set 50, thereby driving the grinding wheel set 50 to vibrate.

[0039] In addition, the vibration assembly 40 further comprises a bolt sleeve 43, the bolt sleeve 43 is arranged in the shaft hole of the plurality of actuators 41, and the bolt sleeve 43 covers the bolt 44 and abuts against the hole wall of the shaft hole, so as to avoid the plurality of actuators 41 from generating unexpected displacement relative to the bolt 44 when the mandrel 20 rotates at high speed.

[0040] As shown in Figure 3 、 Figure 4 and Figure 6As shown, in the preferred embodiment of the present application, the grinding wheel set 50 is further provided with an annular insertion part 53, which is protruded from one side of the grinding wheel base 52, and the front cover 13 of the housing 10 is recessed with an annular ring groove 131, the annular insertion part 53 is inserted into the annular ring groove 131, when the grinding wheel set 50 rotates relative to the housing 10, the annular insertion part 53 rotates in the annular ring groove 131, and the annular ring groove 131 limits the annular insertion part 53, which can avoid the grinding wheel set 50 from being deflected due to vibration, and ensures that the grinding wheel set 50 will not deviate from the installation position, thereby maintaining the processing accuracy.

[0041] As shown in the drawings, Figures 4 to 6 Preferably, the wireless power supply assembly 30 further comprises a circuit arrangement seat 32, the circuit arrangement seat 32 comprises a seat body 322 and two conductive members 321, the seat body 322 is fixed on the first end of the mandrel 20 by bolts, and is provided with two spaced apart circuit channels 324, the two circuit channels 324 are communicated with the inside of the mandrel 20, the actuator 41 is arranged in the inside of the mandrel 20, and the two conductive members 321 are respectively arranged in the two circuit channels 324 and are electrically connected between the magneto-electric conversion member 31B and the actuator 41.

[0042] Specifically, each of the circuit channels 324 extends radially from the outer circumferential surface of the seat body 322 towards the central axis of the seat body 322, and then extends along the axial direction to penetrate one of the opposite side surfaces of the seat body 322, so as to be communicated with the inside of the mandrel 20, and each of the two conductive members 321 is arranged in the corresponding circuit channel 324, and each of the conductive members 321 can extend to the inside of the mandrel 20 through a connecting wire 60 to connect the actuator 41 for electrical connection; in the preferred embodiment of the present application, each of the conductive members 321 is a metal member, specifically, a copper ring can be used, which has good electrical conductivity, is easy to obtain and has low cost.

[0043] As shown in the drawings, Figure 2 , Figure 4 and Figure 5 Further, the wireless power supply assembly 30 further comprises a fixing seat 33, the fixing seat 33 is fixed on the circuit arrangement seat 32 by bolts, and the magneto-electric conversion member 31B is sleeved on the fixing seat 33, so as to rotate synchronously with the circuit arrangement seat 32, the fixing seat 33 and the mandrel 20, and the fixing seat 33 can stably mount the magneto-electric conversion member 31B, wherein the fixing seat 33 is further provided with two through holes 330, each of the through holes 330 is communicated with the inside of the magneto-electric conversion member 31B and the corresponding one of the circuit channels 324, so that the lead wire 311 of the magneto-electric conversion member 31B can transmit the induced voltage to the conductive member 321 through the through hole 330.

[0044] Specifically, the fixing seat 33 comprises a base plate 331 and a protruding column 332 connected with each other, the outer diameter of the base plate 331 is greater than that of the magneto-electric conversion element 31B, the magneto-electric conversion element 31B is sleeved on the protruding column 332 and abuts against the base plate 331, so that the magneto-electric conversion element 31B can be stably arranged; in addition, as shown in Figure 2 and Figure 5 , the wireless power supply assembly 30 further comprises a gland 34, the gland 34 is fixed with the circuit arrangement seat 32 through a bolt, and the fixing seat 33 is clamped between the gland 34 and the circuit arrangement seat 32 to be fixed.

[0045] As shown in Figure 2 , Figure 5 and , further, the seat body 322 is further provided with two positioning holes 325, each of the positioning holes 325 penetrates through one of the circuit channels 324 along the axial direction, the circuit arrangement seat 32 further comprises two positioning pins 323, each of the positioning pins 323 is made of conductive material and can be inserted into one of the conductive elements 321, combined with the corresponding positioning hole 325 and extended into the through hole 330, so that each of the positioning pins 323 is electrically connected between the magneto-electric conversion element 31B and the corresponding conductive element 321.

[0046] Specifically, when the conductive element 321 is installed, the conductive element 321 is first arranged in the corresponding circuit channel 324 from the outer periphery of the seat body 322, then the conductive element 321 is inserted into the corresponding positioning hole 325 by the corresponding positioning pin 323, and the positioning pin 323 is extended into the corresponding through hole 330, the lead wire 311 of the magneto-electric conversion element 31B can extend into the through hole 330 to connect the positioning pin 323 made of conductive material, so that the conductive element 321 is powered.

[0047] Figure 2 As shown in Figure 5 , and

[0048] , in the preferred embodiment of the utility model, the rear cover 12 of the shell 10 is further provided with a circular groove 123, the magneto-electric conversion element 31A is fixedly arranged in the circular groove 123 of the rear cover 12, so as to fix the magneto-electric conversion element 31A on the shell 10, and the bottom of the circular groove 123 is provided with the above-mentioned hole, so that the lead wire 311 of the magneto-electric conversion element 31A can pass through the hole and the circular groove 123, the annular magneto-electric conversion element 31A can be correspondingly accommodated, so as to conveniently position and install the magneto-electric conversion element 31A. Figure 1 , Figure 2 and Figure 5As shown, the rear cover 12 comprises an outer cover 121, a cover plate 122 and a maintenance seat 124. The cover plate 122 is fixed to the bearing seat 14 by bolts, thereby limiting the bearing surrounded by the bearing seat 14. The outer cover 121 is fixed to the cover plate 122 by bolts. The inner part of the outer cover 121 forms a space for arranging the wireless power supply assembly 30. The outer cover 121 is provided with an opening for communicating with the inner part. The maintenance seat 124 is fixed to the outer cover 121 by bolts, and covers the opening of the outer cover 121. The circular groove 123 and the power supply interface 101 for supplying power to the electromagnetic conversion member 31A are arranged on the maintenance seat 124.

[0049] During maintenance, the maintenance seat 124 can be removed from the outer cover 121 by removing the bolts with a tool, thereby directly maintaining the electromagnetic conversion member 31A, the power supply interface 101 and the circuit between them. Alternatively, the circuit arrangement seat 32 and other related components in the outer cover 121 can be taken out for maintenance through the opening of the outer cover 121, thereby improving the convenience.

[0050] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make partial changes or modifications to the equivalent embodiments within the scope of the technical solutions disclosed in the present application without departing from the technical solutions of the present application.

Claims

1. An improved structure of a grinding machine spindle, characterized by, The utility model relates to a wireless power supply type vibration grinding machine, comprising: a housing, which is provided with a power supply interface; a mandrel, which is rotatably arranged in the housing and comprises a first end and a second end; a grinding wheel set, which is arranged at the second end of the mandrel and can be driven to rotate relative to the housing by the mandrel; a wireless power supply assembly, which is arranged between the first end of the mandrel and the power supply interface and comprises an electromagnetic conversion member, which is fixed to the housing and electrically connected to the power supply interface, and can generate a magnetic field by being powered through the power supply interface; and a magneto-electric conversion member, which is arranged between the electromagnetic conversion member and the mandrel, rotates synchronously with the mandrel, and can generate an induced voltage with the change of the magnetic field generated by the electromagnetic conversion member; and a vibration assembly, which is arranged at the second end of the mandrel and comprises at least one actuating member, which is connected to the grinding wheel set and electrically connected to the magneto-electric conversion member, and is made of piezoelectric material, so as to be driven by the induced voltage to stretch and deform along the axial direction of the mandrel, thereby driving the grinding wheel set to vibrate.

2. The grinding machine spindle improvement structure according to claim 1, characterized in that, The vibration assembly comprises a plurality of the actuating members, which are arranged in a stacked manner along the axial direction of the mandrel.

3. The grinding machine spindle improvement structure according to claim 2, wherein The vibration assembly comprises a limiting cover, which is combined with the grinding wheel set by bolts and limits the plurality of actuating members between the limiting cover and the grinding wheel set.

4. The grinding machine spindle improvement structure according to claim 1, wherein The housing is provided with a bushing and a front cover, the front cover is fixed to the bushing and is provided with an annular groove, the grinding wheel set is provided with an annular insertion part, the annular insertion part is inserted into the annular groove, and when the grinding wheel set is driven by the mandrel, the annular insertion part of the grinding wheel set rotates in the annular groove of the front cover.

5. The grinding machine spindle improvement structure according to any one of claims 1 to 4, characterized in that, The actuating member is arranged inside the mandrel, the wireless power supply assembly comprises a circuit arrangement seat, the circuit arrangement seat comprises a seat body and two conductive members, the seat body is fixed to the mandrel and is provided with two spaced apart circuit channels, the circuit channels are communicated with the inside of the mandrel, and the two conductive members are respectively arranged in the two circuit channels and are electrically connected between the magneto-electric conversion member and the actuating member.

6. The grinding machine spindle improvement structure according to claim 5, wherein Each of the conductive members is a metal member.

7. The grinding machine spindle improvement structure according to claim 5, wherein The wireless power supply assembly comprises a fixing seat, the fixing seat is fixed to the circuit arrangement seat, the magneto-electric conversion member is sleeved on the fixing seat, the fixing seat is provided with two through holes, each of the through holes is communicated with the inside of the magneto-electric conversion member and one of the corresponding circuit channels.

8. The grinding machine spindle improvement structure according to claim 7, wherein The seat body of the circuit arrangement seat is provided with two positioning holes, each of the positioning holes penetrates through one of the corresponding circuit channels, the circuit arrangement seat comprises two positioning pins, each of the conductive members is sleeved on one of the corresponding positioning pins, each of the positioning pins is made of conductive material and is combined in one of the corresponding positioning holes, extends into one of the corresponding through holes, and is electrically connected between the magneto-electric conversion member and the corresponding conductive member.

9. The grinding machine spindle improvement structure according to any one of claims 1 to 4, characterized in that, The housing is provided with a bushing and a rear cover, the rear cover is fixed to one end of the bushing and is recessed with a circular groove, and the electromagnetic conversion member is accommodated in the circular groove.

10. The grinding machine spindle improvement structure according to claim 9, wherein The rear cover comprises an outer cover shell and a maintenance seat. The inner part of the outer cover shell is formed with a space for arranging the wireless power supply assembly. The outer cover shell is provided with an opening communicating with the inner part. The maintenance seat is fixed to the outer cover shell by bolts and covers the opening of the outer cover shell. The circular groove and the power supply interface are arranged on the maintenance seat.

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