A power-off brake with a combined magnetic circuit

Abstract

The present invention discloses a power-off brake with a combined magnetic circuit, which includes a bottom plate, a plurality of magnetic yokes, a plurality of coils, a plurality of gap adjustment mechanisms, a plurality of shock absorption and guiding mechanisms, a plurality of armature reset mechanisms, and an armature. The magnetic yokes are provided on the bottom plate, and the magnetic yokes are arranged in a non-integrally formed structure with the bottom plate. Coils are provided on the magnetic yokes. The armature is located on one side of the magnetic pole surface of the magnetic yoke. The gap adjustment mechanisms are arranged on the bottom plate and the armature. The shock absorption and guiding mechanisms are arranged on the bottom plate and the armature. The armature reset mechanisms are arranged between the bottom plate and the armature. The magnetic yokes are formed by combined assembly, belonging to the additive method. Compared with the prior art, it can save materials and has good fitting flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, in particular to the technical field of power-off brakes with a combined magnetic circuit structure.

Background Art

[0002] A power-off brake is a mechanical device that uses a spring and a power source as the power source to brake and release a brake disc. It performs braking under power-off conditions, so it is called a power-off brake. Its structure includes a yoke, an armature, a spring, a coil, a friction disc, a friction plate, a release handle, a microswitch, etc. The working principle of the power-off brake is as follows: The yoke and the coil mounted on the yoke form an electromagnet. When the coil is not powered on, the spring presses the armature tightly against the friction plate, forming a frictional resistance on the friction plate, so that the friction disc is braked and the equipment connected to the friction disc is braked; when the coil is powered on, the magnetic force generated by the yoke is opposite to the thrust generated by the spring, and the electromagnetic force greater than the spring thrust attracts the armature to one side of the yoke, separating the armature from the friction plate, so that a gap is generated between the armature and the friction plate, and the frictional resistance acting on the friction plate disappears, and the braking is released.

[0003] The yoke in the prior art is as Figure 1 , and is made into an integrally formed yoke with a number of coil mounting grooves by cutting and processing the yoke plate with a milling machine and other cutting equipment, which belongs to the material subtraction method. Moreover, there is a lot of material left after processing that does not play an actual role, such as Figure 1 part B in, removing them has very little impact on the electromagnet, thus wasting materials and having poor fitting flexibility.

Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and propose a power-off brake with a combined magnetic circuit structure, the yoke of which is formed by combining and assembling, belonging to the material addition method, which can save materials and has good fitting flexibility.

[0005] To achieve the above purpose, the present invention proposes a power-off brake with a combined magnetic circuit structure, including a bottom plate, a number of yokes, a number of coils, a number of gap adjustment mechanisms, a number of shock absorption and guiding mechanisms, a number of armature reset mechanisms, and an armature. The bottom plate is provided with yokes, the yokes are arranged in a non-integrally formed structure with the bottom plate, the yokes are all provided with coils, the armature is located on one side of the pole face of the yoke, the gap adjustment mechanism is arranged on the bottom plate and the armature, the shock absorption and guiding mechanism is arranged on the bottom plate and the armature, and the armature reset mechanism is arranged between the bottom plate and the armature.

[0006] Preferably, the yoke and the bottom plate are fixedly connected together by welding or screws.

[0007] Preferably, the gap adjusting mechanism is adjusting mechanism I, which includes a guide post body penetrating through the bottom plate and the armature. The outer circumference of the lower end of the guide post body is provided with an external thread threadedly connected to the bottom plate. The lower end of the guide post body is provided with a screwing part, and a mounting screw penetrates through the guide post body and the screwing part.

[0008] Preferably, the gap adjusting mechanism is adjusting mechanism II, which includes a guide post body penetrating through the bottom plate and the armature. The outer circumference of the lower end of the guide post body is provided with an external thread threadedly connected to the bottom plate. The lower end of the guide post body is provided with a screwing head composed of a plurality of plug connectors. A gasket pressing on the back surface of the bottom plate is sleeved on the screwing head. A mounting screw penetrates through the guide post body and the gasket, and the gasket is provided with plugging holes corresponding to the plug connectors one by one.

[0009] Preferably, the screwing head is formed by six plug connectors spaced circumferentially. The outer side surface of the plug connector is provided with two symmetrically arranged inclined surfaces, and the included angle formed by the two inclined surfaces is 120°.

[0010] Preferably, the shock absorption and guiding mechanism includes a buffer mechanism, a guiding guide post provided at the lower end of the armature, and a support seat provided on the bottom plate. The upper end of the support seat is provided with a receiving groove. An adjusting mechanism is provided on the support seat, and the buffer mechanism located in the receiving groove is provided on the adjusting mechanism. The guiding guide post is located in the receiving groove.

[0011] Preferably, the adjusting mechanism includes a lock washer spring, a screw rod, a rotating head and a plug. The lower end of the support seat is provided with a stepped hole that is small at the top and large at the bottom and communicates with the receiving groove. The lower end of the stepped hole extends downward through the back surface of the bottom plate. The upper end of the screw rod penetrates through the stepped hole and is provided with a plug located in the receiving groove. The screw rod is threadedly connected to the small end hole of the stepped hole. The lower end of the screw rod is provided with a rotating head, and a lock washer spring is sleeved on the screw rod between the upper end of the large end hole of the stepped hole and the rotating head.

[0012] Preferably, the armature reset mechanism is reset mechanism I, which includes a base, a positioning post provided on the base, and a reset spring sleeved on the positioning post. The armature reset mechanism is reset mechanism II, which includes a cylinder body with an open upper end. The lower end of the cylinder body is provided with a plug connector inserted and connected to the bottom plate, and a spring is provided in the cylinder body.

[0013] Preferably, it also includes a position detection device, which includes a magnet, a pushing mechanism arranged on the armature and a transmission mechanism arranged on the base plate, the transmission mechanism includes a rolling bearing, a toggle member and a mounting member, the toggle member is rotatably connected to the mounting member through a rolling bearing, the pushed end of the toggle member corresponds to the pushing mechanism, and the pushing mechanism pushes the toggle member to rotate under the drive of the armature so that it presses the contacts of the micro switch, and the lower end of the armature is provided with a magnet corresponding to the attraction end of the toggle member.

[0014] Preferably, the mounting member comprises a mounting seat and a fixing screw, and the inner ring of the rolling bearing is fixedly connected to the mounting seat via the fixing screw.

[0015] Beneficial effects of the present invention: The present invention saves materials and processing time by fixing a plurality of yokes on the base plate to replace the traditional one-piece yokes, and suitable yokes and base plates can be selected according to needs, which has good coordination flexibility and reduces inventory.

[0016] The screwing part and the screwing head are located on the back side of the bottom plate. After installation, the back side faces outwards and is not easily blocked during adjustment, thereby further improving the convenience of adjustment.

[0017] The lower end of the guide column body is provided with a screwing head composed of a number of plug connectors, and a gasket pressed on the back of the base plate is provided on the screwing head. Screws are passed through the guide column body and the gasket. Since the screws press the base plate through the gasket, the problem of the thread clearance affecting the working clearance in actual use when the brake is actuated is avoided, and the accuracy and reliability are good.

[0018] By providing a receiving groove at the upper end of the support seat, providing a buffer mechanism located in the receiving groove on the adjustment mechanism, and locating the guide post in the receiving groove, guiding and shock absorption are achieved, which can save space and reduce production costs.

[0019] A spring is provided on the screw between the rotating head and the upper end of the large end hole of the step hole, which has a good relaxation effect. The front and rear positions of the buffer mechanism can be adjusted by directly twisting the rotating head to drive the screw to rotate. The adjustment is convenient and the structure is simple.

[0020] The toggle piece is rotatably connected to the mounting piece via a rolling bearing, and the pushed end of the toggle piece corresponds to the pushing mechanism. The pushing mechanism pushes the toggle piece to rotate under the drive of the armature so that it presses the contact of the micro switch. A magnet corresponding to the toggle piece is provided at the lower end of the armature to drive the toggle piece to reset and rotate, which can improve the flexibility and reliability of use.

[0021] The toggle member is rotatably connected to the mounting member via a rolling bearing, and can rotate flexibly and stably, thereby ensuring the normal rotation accuracy of the toggle member. The toggle member is driven to reset and rotate via a magnet, thereby avoiding the risk of fatigue fracture caused by spring reset in traditional trigger mechanisms or the problem of action failure caused by improper assembly, thereby improving reliability.

[0022] The structural design of the mounting piece can facilitate the installation and disassembly of the rolling bearing.

[0023] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the structure of a traditional yoke;

[0025] Figure 2 It is a structural schematic diagram of a magnetic circuit combined power-off brake of the present invention;

[0026] Figure 3 is a schematic diagram of the structure of the regulating mechanism I;

[0027] Figure 4 is a schematic diagram of the structure of the regulating mechanism II;

[0028] Figure 5 It is a structural schematic diagram of the shock absorbing guide mechanism;

[0029] Figure 6 is a schematic diagram of the structure of a position detection device;

[0030] Figure 7 yes Figure 6 Sectional view of AA in the middle;

[0031] Figure 8 It is a schematic diagram of the structure of the integral yoke;

[0032] Figure 9 It is a schematic diagram of the structure of the split yoke II;

[0033] Figure 10 It is a schematic diagram of the structure of the split yoke I;

[0034] Figure 11 It is a structural schematic diagram of a non-integrated annular outer pole;

[0035] Figure 12 It is a structural schematic diagram of the inner pole of a non-integrated structure;

[0036] Figure 13 It is a structural schematic diagram of the reset mechanism 1;

[0037] Figure 14 It is a structural schematic diagram of the reset mechanism II.

[0038] In the figure: 1-base plate, 2-yoke, 3-coil, 4-gap adjustment mechanism, 5-shock-absorbing guide mechanism, 6-armature reset mechanism, 7-armature, 8-position detection device, 41-guide column, 42-external thread, 43-screwing part, 44-mounting screw, 45-gasket, 46-plug connector, 461-inclined surface, 51-guide guide column, 52-adjustment mechanism, 53-buffer mechanism, 54-support seat, 55-accommodation groove, 56-step hole, 521-anti-loosening spring, 522-screw, 523-rotating head, 524-plug, 61-positioning column, 62-base, 63-reset spring, 81-pushing mechanism, 82-transmission mechanism, 83-magnet, 84-micro switch, 821-bearing, 822-toggle member, 823-mounting member, 8231-mounting seat, 8232-fixing screw. [Specific implementation method]

[0039] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 The present invention discloses a magnetic circuit combined power-off brake, comprising a base plate 1, a plurality of yokes 2, a plurality of coils 3, a plurality of gap adjustment mechanisms 4, a plurality of damping guide mechanisms 5, a plurality of armature reset mechanisms 6 and an armature 7. The base plate 1 is provided with a yoke 2, and the yoke 2 and the base plate 1 are not integrally formed structures. The yokes 2 are provided with coils 3, and the armature 7 is located on one side of the magnetic pole surface of the yoke 2. The gap adjustment mechanism 4 is provided on the base plate 1 and the armature 7, the damping guide mechanism 5 is provided on the base plate 1 and the armature 7, and the armature reset mechanism 6 is provided between the base plate 1 and the armature 7.

[0040] The yoke 2 and the bottom plate 1 are fixedly connected together by welding or screws. The yoke 2 is an integral yoke, a split yoke I or a split yoke II. The integral yoke includes a yoke body I 21 and a coil groove 22 provided at the upper end of the yoke body I 21. The split yoke I includes an annular outer pole 31 and an inner pole 32 located inside the annular outer pole 31. A coil installation space 33 is left between the annular outer pole 31 and the inner pole 32. The annular outer pole 31 is an integral structure or a non-integral structure. The non-integral annular outer pole 31 is formed by stacking and fixedly connecting a plurality of annular sheets 311 in sequence. The inner pole 32 is an integral structure or a non-integral structure. The non-integral inner pole 32 is formed by stacking and fixedly connecting a plurality of sheet bodies I 321 in sequence. The split yoke II includes a housing 41 with an open upper end. A yoke body II 42 is provided on the inner bottom surface of the housing 41. The yoke body II 42 is an integral structure or is formed by stacking and fixedly connecting a plurality of sheet bodies II 421 in sequence.

[0041] The gap adjusting mechanism 4 is an adjusting mechanism I. The adjusting mechanism I includes a guide post body 41 passing through the bottom plate 1 and the armature 7. An external thread 42 threadedly connected to the bottom plate 1 is provided on the circumferential surface of the lower end of the guide post body 41. A screwing part 43 is provided at the lower end of the guide post body 41. Mounting screws 44 are passed through the guide post body 41 and the screwing part 43.

[0042] The gap adjusting mechanism 4 is an adjusting mechanism II. The adjusting mechanism II includes a guide post body 41 passing through the bottom plate 1 and the armature 7. An external thread 42 threadedly connected to the bottom plate 1 is provided on the circumferential surface of the lower end of the guide post body 41. A screwing head formed by a plurality of plug connectors 46 is provided at the lower end of the guide post body 41. A gasket 45 pressing against the back surface of the bottom plate 1 is sleeved on the screwing head. Mounting screws 44 are passed through the guide post body 41 and the gasket 45. The screwing head is formed by six plug connectors 46 spaced apart circumferentially. Two symmetrically arranged inclined surfaces 461 are provided on the outer side surface of the plug connector 46. The included angle formed by the two inclined surfaces 461 is 120°. Plugging holes 451 corresponding to the plug connectors 46 one by one are provided on the gasket 45.

[0043] The shock-absorbing and guiding mechanism 5 includes a buffer mechanism 53, a guiding and guiding column 51 provided at the lower end of the armature 7, and a support seat 54 provided on the bottom plate 1. An accommodation groove 55 is provided at the upper end of the support seat 54. An adjustment mechanism 52 is provided on the support seat 54. The buffer mechanism 53 located in the accommodation groove 55 is provided on the adjustment mechanism 52. The guiding and guiding column 51 is located in the accommodation groove 55. The adjustment mechanism 52 includes a lock spring 521, a screw 522, a rotating head 523, and a plug 524. A stepped hole 56 that is small at the top and large at the bottom and communicates with the accommodation groove 55 is provided at the lower end of the support seat 54. The lower end of the stepped hole 56 extends downward through the back surface of the bottom plate 1. The upper end of the screw 522 passes through the stepped hole 56 and is provided with a plug 524 located in the small end of the accommodation groove 55. The screw 522 is threadedly connected to the small end hole of the stepped hole 56. A rotating head 523 is provided at the lower end of the screw 522. A lock spring 521 is sleeved on the screw 522 between the upper end of the large end hole of the stepped hole 56 and the rotating head 523. The accommodation groove 55 is a stepped groove that is large at the top and small at the bottom. A composite bearing 57 is provided between the large end groove wall of the accommodation groove 55 and the guiding and guiding column 51. The buffer mechanism 53 includes an O-shaped buffer pad 531 and an intermediate buffer pad 532 located inside the O-shaped buffer pad 531. An internal hexagonal groove 525 is provided at the lower end of the rotating head 523.

[0044] The armature reset mechanism 6 is a reset mechanism I. The reset mechanism I includes a base 62, a positioning column 61 provided on the base 62, and a reset spring 63 sleeved on the positioning column 61. The armature reset mechanism 6 is a reset mechanism II. The reset mechanism II includes a cylinder body 64 with an open upper end. A plug connector 65 for plugging and connecting with the bottom plate 1 is provided at the lower end of the cylinder body 64. A spring 63 is provided inside the cylinder body 64.

[0045] It also includes a position detection device 8, which includes a magnet 83, a pushing mechanism 81 arranged on the armature 7 and a transmission mechanism 82 arranged on the base plate 1, the transmission mechanism 82 includes a rolling bearing 821, a toggle member 822 and a mounting member 823, the toggle member 822 is rotatably connected to the mounting member 823 through the rolling bearing 821, the pushed end of the toggle member 822 corresponds to the pushing mechanism 81, the pushing mechanism 81 pushes the toggle member 822 to rotate under the drive of the armature 7 so that it presses the contact of the micro switch 84, the lower end of the armature 7 is provided with a magnet 83 corresponding to the attraction end of the toggle member 822, the mounting member 823 includes a mounting seat 8231 and a fixing screw 8232, the inner ring of the rolling bearing 821 is fixedly connected to the mounting seat 8231 through the fixing screw 8232, the micro switch 84 is fixed on the mounting seat 8231, the pushing mechanism 81 includes a The bolt 811 connected, the threaded rod of the bolt 811 is provided with a nut 812 matched therewith, the nut 812 is located at the upper end of the armature 7, the inner diameter of the inner ring of the rolling bearing 821 is equal to the diameter of the threaded rod of the fixing screw 8232, the threaded rod of the fixing screw 8232 is sleeved with a washer 8233 located between the inner ring of the rolling bearing 821 and the mounting seat 8231, the threaded rod of the fixing screw 8232 is sleeved with a washer 8233 located between the inner ring of the rolling bearing 821 and the mounting seat 8231, and the threaded rod of the fixing screw 8232 is sleeved with a washer 8233 located between the inner ring of the rolling bearing 821 and the mounting seat 8231. 1 and a washer 8233 between the inner ring of the rolling bearing 821 and the head of the fixing screw 8232, the toggle member 822 comprises a support 8221, a toggle rod 8222, a pressing head 8223 and an attracted body 8224, the support 8221 is fixedly arranged on the outer ring of the rolling bearing 821, the rear lower end of the support 8221 is provided with a toggle rod 8222, the lower end of the toggle rod 8222 is provided with a pressing head 8223, and the rear upper end of the support 8221 is provided with an attracted body 8224.

[0046] The bottom plate 1 is composed of two half bottom plate bodies 11, and the upper end of the armature 7 is provided with a friction plate 9. The armature 7 includes two half armature bodies 71. Figure 2 Only one is drawn in the figure, and a position detection device 8 is provided on the upper and lower corresponding half of the bottom plate body and half of the armature body.

[0047] Working process of the present invention:

[0048] During operation of the magnetic circuit combined power-off brake of the present invention, the coil 3 is energized to generate a magnetic field and generate an attraction force on the armature 7. Under the action of the attraction force, the armature 7 overcomes the elastic force of the reset spring 63 and moves toward the yoke 2. After the coil 3 is powered off, the coil 3 loses the magnetic field, and the armature 7 resets under the action of the reset spring 63.

[0049] When the armature 7 moves downward, the pushing mechanism 81 drives the support 8221 to rotate clockwise under the drive of the armature 7. The support 8221 drives the pressing head 8223 to press the contact of the microswitch 84 through the lever 8222, thereby triggering the microswitch 84. At this time, the armature 7 is in the position after being attracted and descending. When the armature 7 moves upward, the pushing mechanism 1 and the magnet 83 move upward under the drive of the armature 7. At the same time, the magnet 83 drives the support 8221 to rotate counterclockwise and reset through the attracted body 8224, and the microswitch 84 is not triggered. The armature 7 is in the position after rising.

[0050] When the armature 7 moves downward, the armature 7 drives the guiding and guiding column 51 to move downward and compress the buffer mechanism 53.

[0051] By directly turning the rotating head 523 with a turning tool to drive the screw 522 to rotate, the up and down position of the buffer mechanism 3 can be adjusted.

[0052] Loosen the mounting screw 44, and then turn the turning head or turning part 43 clockwise or counterclockwise with a turning tool. The turning head or turning part 43 drives the guide column body 41 to rotate, and the guide column body 41 drives the bottom plate 1 to move closer to or away from the armature 7. After the adjustment is completed, install the screw 44.

[0053] The above embodiments are illustrative of the present invention, not limiting of the present invention. Any simple transformation of the present invention also falls within the protection scope of the present invention.

Claims

1. A power-off brake with a combined magnetic circuit, characterized in that: It includes a bottom plate (1), a number of magnetic yokes (2), a number of coils (3), a number of gap adjustment mechanisms (4), a number of shock absorption and guiding mechanisms (5), a number of armature reset mechanisms (6), and an armature (7). The bottom plate (1) is provided with magnetic yokes (2), and the magnetic yokes (2) are arranged in a non-integrally formed structure with the bottom plate (1). Coils (3) are provided on the magnetic yokes (2). The armature (7) is located on one side of the magnetic pole surface of the magnetic yoke (2). The gap adjustment mechanism (4) is provided on the bottom plate (1) and the armature (7). The shock absorption and guiding mechanism (5) is provided on the bottom plate (1) and the armature (7). The armature reset mechanism (6) is provided between the bottom plate (1) and the armature (7). The gap adjustment mechanism (4) is an adjustment mechanism II. The adjustment mechanism II includes a guide column body (41) penetrating through the bottom plate (1) and the armature (7). The outer circumference of the lower end of the guide column body (41) is provided with an external thread (42) threadedly connected to the bottom plate (1). The lower end of the guide column body (41) is provided with a screwing head composed of a number of plug connectors (46). A gasket (45) pressing on the back surface of the bottom plate (1) is sleeved on the screwing head. An installation screw (44) penetrates through the guide column body (41) and the gasket (45). The screwing head is formed by six plug connectors (46) spaced apart circumferentially. The outer side surface of the plug connector (46) is provided with two symmetrically arranged inclined surfaces (461). The included angle formed by the two inclined surfaces (461) is 120°. The gasket (45) is provided with plug holes (451) corresponding to the plug connectors (46) one by one. The shock absorption and guiding mechanism (5) includes a buffer mechanism (53), a guiding guide column (51) provided at the lower end of the armature (7), and a support seat (54) provided on the bottom plate (1). The upper end of the support seat (54) is provided with a receiving groove (55). The support seat (54) is provided with an adjustment mechanism (52). The buffer mechanism (53) located in the receiving groove (55) is provided on the adjustment mechanism (52). The guiding guide column (51) is located in the receiving groove (55). The adjustment mechanism (52) includes a lock washer spring (521), a screw (522), a rotating head (523), and a plug (524). The lower end of the support seat (54) is provided with a stepped hole (56) that is small at the top and large at the bottom and communicates with the receiving groove (55). The lower end of the stepped hole (56) extends downward through the back surface of the bottom plate (1). The upper end of the screw (522) passes through the stepped hole (56) and is provided with a plug (524) located in the receiving groove (55). The screw (522) is threadedly connected to the small end hole of the stepped hole (56). The lower end of the screw (522) is provided with a rotating head (523). A lock washer spring (521) is sleeved on the screw (522) between the rotating head (523) and the upper end of the large end hole of the stepped hole (56). It further includes a position detection device (8). The position detection device (8) includes a magnet (83), a pushing mechanism (81) provided on the armature (7), and a transmission mechanism (82) provided on the bottom plate (1).The transmission mechanism (82) includes a rolling bearing (821), a toggling member (822), and a mounting member (823). The toggling member (822) is rotatably connected to the mounting member (823) through the rolling bearing (821). The pushed end of the toggling member (822) corresponds to the pushing mechanism (81). The pushing mechanism (81) drives the toggling member (822) to rotate under the drive of the armature (7) so as to press the contact of the microswitch (84). A magnet (83) corresponding to the attracting end of the toggling member (822) is provided at the lower end of the armature (7). The yoke (2) is a split yoke I. The split yoke I includes an annular outer pole (31) and an inner pole (32) located inside the annular outer pole (31). A coil installation space (33) is left between the annular outer pole (31) and the inner pole (32). The annular outer pole (31) is of a non-integral structure. The non-integral annular outer pole (31) is formed by sequentially stacking and fixedly connecting a plurality of annular sheets (311) together. The inner pole (32) is of a non-integral structure. The non-integral inner pole (32) is formed by sequentially stacking and fixedly connecting a plurality of sheet bodies I (321) together., 2. The magnetic circuit combined power-off brake according to claim 1, characterized in that: The yoke (2) and the base plate (1) are fixedly connected together by welding or screws.

3. The electro-magnetic losing power brake with magnetic circuit combination according to claim 1, characterized in that: The armature reset mechanism (6) is a reset mechanism I. The reset mechanism I includes a base (62), a positioning post (61) provided on the base (62), and a reset spring (63) sleeved on the positioning post (61). The armature reset mechanism (6) is a reset mechanism II. The reset mechanism II includes a cylinder body (64) with an open upper end. The lower end of the cylinder body (64) is provided with a plug connector (65) inserted and connected to the base plate (1), and a spring (63) is arranged in the cylinder body (64).

4. A power-off brake with a combined magnetic circuit according to any one of claims 1 to 3, characterized in that: The mounting member (823) includes a mounting seat (8231) and fixing screws (8232). The inner ring of the rolling bearing (821) is fixedly connected to the mounting seat (8231) through the fixing screws (8232).

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