Shaft current eliminating device for roller bed motor

Abstract

The utility model provides a shaft current eliminating device for a roller way motor, which relates to the technical field of motors and is used for being connected with a rotating shaft of the roller way motor. The shaft current eliminating device comprises a brush box, a carbon brush and a connecting structure, the connecting structure is fixed on the brush box, the connecting structure is used for being connected with a bearing outer cover of the roller way motor, the carbon brush is placed in the brush box, and one end of the carbon brush is used for being tightly attached to a rotating shaft of the roller way motor. According to the utility model, the shaft current flows from the rotating shaft to the brush box, so that the shaft current is effectively led out, the roller way motor bearing is protected from being electrically corroded by the shaft current, the service life of the roller way motor bearing is prolonged, and the reliability and the operation efficiency of the roller way motor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly to an axial current elimination device for a roller table motor. Background Art

[0002] As a crucial power source in modern mechanical equipment, the rotary roller table motor mainly realizes the conversion between electrical energy and mechanical energy through electromagnetic effects. With the progress of technology, the rotary roller table motor has been widely used in industries, transportation, household appliances and other fields.

[0003] However, during the actual operation process, the interior of the motor is often affected by factors such as electromagnetic effects, unbalanced voltage, and harmonics, resulting in abnormal circulation of electrical energy between the stator and the rotor, and generating current (i.e., axial current) in the axial direction. The axial current flows along the axis of the roller table motor, which will not only damage the bearings of the roller table motor, but also cause an increase in the vibration and noise of the roller table motor, accelerate the wear of the bearings, thereby shortening the service life of the bearings of the roller table motor and reducing the reliability and operating efficiency of the roller table motor. Summary of the Utility Model

[0004] The problem solved by the utility model is how to eliminate the erosion of the axial current on the roller table motor and improve the operating efficiency and service life of the roller table motor.

[0005] To solve the above problems, the utility model provides an axial current elimination device for a roller table motor. The axial current elimination device is used to be connected to the rotating shaft of the roller table motor. The axial current elimination device includes a brush box, a carbon brush, and a connection structure.

[0006] Wherein, the connection structure is fixed on the brush box, and the connection structure is used to be connected to the outer bearing cover of the roller table motor.

[0007] The carbon brush is placed in the brush box, and one end of the carbon brush is used to be in close contact with the rotating shaft of the roller table motor.

[0008] Optionally, the axial current elimination device further includes: a bracket. The bracket is fixed above the brush box. An elastic element is arranged in the bracket. The elastic element is in a compressed state. One end of the elastic element is connected to the bracket, and the elastic element is in close contact with the other end of the carbon brush.

[0009] Optionally, the elastic element is a constant force spring.

[0010] Optionally, the bracket includes a first frame plate and a second frame plate connected to each other. The free end of the elastic element is fixedly connected to the inner side of the first frame plate, and the winding direction of the elastic element is downward.

[0011] Optionally, one end of the first mounting plate is connected to the first side surface of the brush box, and one end of the second mounting plate is connected to the second side surface of the brush box.

[0012] Optionally, the other end of the first mounting plate is fixedly connected to the other end of the second mounting plate.

[0013] Optionally, the second side surface is located on the opposite side of the first side surface.

[0014] Optionally, a buckle is provided on the outer side of the first mounting plate, and a mounting hole adapted to the buckle is provided on the first side surface of the brush box. The first mounting plate and the first side surface are connected by the buckle.

[0015] Optionally, the connecting structure is a screw rod, and a thread adapted to one end of the screw rod is provided on the bearing outer cover.

[0016] Optionally, a circular hole is provided on the second side surface of the brush box, and an internal thread adapted to the other end of the screw rod is provided on the circular hole.

[0017] The beneficial effects of the shaft current elimination device of the present utility model are as follows: The shaft current elimination device is fixedly connected to the bearing outer cover of the roller table motor through a connecting structure, ensuring that the shaft current elimination device will not shift or fall off due to vibration during the operation of the roller table motor; the carbon brush is firmly fixed in the brush box, ensuring a tight fit between the carbon brush and the rotating shaft of the roller table motor; when the roller table motor works, shaft current will be generated. The shaft current will form a closed loop inside the roller table motor. If there is no proper conduction path, these currents will flow through the bearing, resulting in electrical corrosion. The good contact between the carbon brush and the rotating shaft forms a low-impedance path, enabling the shaft current to flow smoothly from the rotating shaft through the carbon brush and finally to an external grounding device, such as a grounded bearing outer cover, thereby avoiding the erosion of the shaft current on the bearing and improving the operation efficiency and service life of the roller table motor. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the partial structure of the shaft current elimination device and the roller table motor in an embodiment of the present utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the shaft current elimination device from another perspective in an embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the bracket structure of the shaft current elimination device in an embodiment of the present utility model;

[0021] Figure 4 It is a schematic diagram of the elastic element on the bracket of the shaft current elimination device in an embodiment of the present utility model;

[0022] Figure 5It is the bearing outer cover of the roller table motor in the embodiment of the present utility model;

[0023] Figure 6 It is a schematic structural diagram of the brush box of the shaft current elimination device in the embodiment of the present utility model;

[0024] Figure 7 It is a schematic structural diagram of another perspective of the brush box of the shaft current elimination device in the embodiment of the present utility model.

[0025] Description of reference numerals:

[0026] 1. Shaft current elimination device; 11. Brush box; 111. First side; 1111. Mounting hole; 112. Second side; 1121. Circular hole; 12. Carbon brush; 13. Connection structure; 14. Bracket; 141. First shelf plate; 142. Second shelf plate; 143. Elastic element; 1431. Free end; 144. Snap;

[0027] 2. Roller table motor; 21. Rotating shaft; 22. Bearing outer cover; 221. Thread. Detailed implementation manners

[0028] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0029] It should be understood that the various steps recorded in the method embodiments of the present utility model can be executed in different orders and / or executed in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present utility model is not limited in this regard.

[0030] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present utility model are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependent relationships.

[0031] It should be noted that the modifications of "one" and "multiple" mentioned in the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise clearly specified in the context, it should be understood as "one or more".

[0032] The names of the messages or information exchanged between multiple devices in the embodiments of the present utility model are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0033] As Figure 1 shown, an axial current elimination device method for a roller table motor provided by an embodiment of the present utility model, the axial current elimination device 1 is used to connect with the rotating shaft 21 of the roller table motor 2, and the axial current elimination device 1 includes a brush box 11, a carbon brush 12 and a connection structure 13.

[0034] Wherein, the connection structure 13 is fixed on the brush box 11, and the connection structure 13 is used to connect with the bearing outer cover 22 of the roller table motor 2;

[0035] The carbon brush 12 is placed in the brush box 11, and one end of the carbon brush 12 is used to closely fit with the rotating shaft 21 of the roller table motor 2.

[0036] Specifically, the axial current elimination device 1 is installed on the roller table motor 2 to reduce the axial current. The axial current elimination device 1 includes a brush box 11, a carbon brush 12 and a connection structure 13. The brush box 11 is a component for containing and fixing the position of the carbon brush 12, and usually a metal material with high temperature resistance and corrosion resistance is selected to ensure its durable use in the operating environment of the roller table motor 2. The brush box 11 includes a slot for inserting the carbon brush 12 to ensure the stability of the carbon brush 12 during operation. The size of the slot of the carbon brush 12 is set according to the size and shape of the carbon brush 12 to ensure the best fit and the minimum friction loss. The carbon brush 12 is usually made of a material with good electrical conductivity and wear resistance, such as graphite or metal graphite composite material. The carbon brush 12 is in close contact with the rotating shaft 21, so that one end of the carbon brush 12 that is not in contact with the rotating shaft 21 can be grounded, forming a low-resistance conductive channel to lead the axial current to the ground, effectively avoiding the bearing electrolysis caused by the axial current flowing through the bearing.

[0037] In this embodiment, the shaft current elimination device 1 is fixedly connected to the bearing cover 22 of the roller table motor 2 through a connection structure 13 to ensure that the shaft current elimination device 1 will not shift or fall off due to vibration during the operation of the roller table motor 2; the carbon brush 12 is firmly fixed in the brush box 11 to ensure a tight fit between the carbon brush 12 and the rotating shaft 21 of the roller table motor 2; when the roller table motor 2 operates, shaft current will be generated, and the shaft current will form a closed loop inside the roller table motor 2. If there is no proper conduction path, these currents will flow through the bearings, resulting in electrical corrosion. The good contact between the carbon brush 12 and the rotating shaft 21 forms a low-impedance path, enabling the shaft current to smoothly flow from the rotating shaft 21 through the carbon brush 12 and finally to an external grounding device, such as the grounded bearing cover 22, thereby avoiding the erosion of the shaft current on the bearings and improving the operation efficiency and service life of the roller table motor 2.

[0038] In addition, in the related art, an insulating material is directly arranged inside the bearing to eliminate the shaft current. This insulating material needs to match the size of the roller table motor bearing. Compared with the related art, this shaft current elimination device does not need to match the size of the roller table motor bearing. Through the connection structure of the shaft current elimination device, it can be fixed on the bearing cover corresponding to the roller table motor bearing of any size to achieve the purpose of eliminating the shaft current, and has wide applicability and economy.

[0039] Optionally, the shaft current elimination device further includes: a bracket 14, the bracket 14 is fixed above the brush box 11, an elastic element 143 is arranged in the bracket 14, the elastic element 143 is in a compressed state, one end of the elastic element 143 is connected to the bracket 14, and the elastic element is in close contact with the other end of the carbon brush 12.

[0040] Specifically, as Figure 2 and Figure 3 shown, in addition to the carbon brush 12, the brush box 11, and the connection structure 13, the shaft current elimination device 1 further includes a bracket 14, aiming to stabilize the entire device and ensure effective contact between the carbon brush 12 and the rotating shaft 21 of the roller table motor 2. The bracket 14 is installed above the brush box 11 to support and fix the entire device. An elastic element 143 is arranged inside the bracket 14. These elastic elements can be springs or other types of elastic materials, used to provide continuous pressure to the carbon brush 12. The elastic element 143 is in close contact with the other end of the carbon brush 12 to ensure that a good contact state is always maintained between the carbon brush 12 and the rotating shaft 21 of the roller table motor 2, and a stable connection can be maintained even when the roller table motor 2 vibrates or the rotating shaft moves. The bracket 14 can be selected from steel, aluminum alloy or composite materials. The material selection of the bracket 14 should ensure that it can stably support the brush box 11 and other components, and at the same time have sufficient mechanical strength and durability to adapt to the vibration and temperature changes during the operation of the roller table motor 2. The bracket 14 can also be made by bending a steel plate into a U shape.

[0041] In this embodiment, the bracket 14 not only provides additional support for the entire device, but also ensures that the shaft current elimination device 1 will not shift or loosen when the roller table motor 2 vibrates, enhancing the stability and reliability of the shaft current elimination device 1. An elastic element 143 is provided on the side of the bracket 14 in contact with the carbon brush 12, which can provide continuous pressure for the carbon brush 12 to ensure that there is always close contact between the carbon brush 12 and the rotating shaft 21 of the roller table motor 2. The shaft current can be effectively guided from the rotating shaft 21 to the carbon brush 12 and discharged through an external path, avoiding the direct passage of the shaft current through the bearing, thereby reducing the risk of electrical erosion of the bearing. Due to the stable pressure provided by the elastic element 143, the contact between the carbon brush 12 and the rotating shaft 21 is more reliable. Even under the influence of vibration and external forces, the carbon brush 12 can still maintain stable contact with the shaft of the roller table motor 2, reducing the wear caused by poor contact, and thus extending the service life of the shaft current elimination device 1.

[0042] Optionally, the elastic element 143 is a constant force spring.

[0043] Optionally, the bracket 14 includes a first plate 141 and a second plate 142 connected to each other. The free end 1431 of the elastic element 143 is fixedly connected to the inner side of the first plate 141, and the winding direction of the elastic element 143 is downward.

[0044] Specifically, as Figure 3 and Figure 4 shown, to ensure continuous and stable contact between the carbon brush 12 and the rotating shaft 21, an elastic element 143 is provided on the inner side of the first plate 141 of the bracket 14, that is, on the side facing the carbon brush 12. The elastic element 143 is in close fit with the carbon brush 12 and provides pressure for the carbon brush 12, which can press the carbon brush 12 tightly against the rotating shaft 21. The elastic element 143 is a constant force spring. The free end 1431 and the winding part of the constant force spring, there is an end ring on the free end 1431, that is, the annular part on the free end 1431 of the spring, which can be fixedly connected to the inner side of the first plate 141 through the end ring. The winding part is the main part of the spring, usually made of metal and having elasticity. The free end 1431 of the constant force spring is fixed on the first plate 141 of the bracket 14, the bottom of the winding part abuts against the carbon brush, and the winding direction of the winding part is downward (corresponding to Figure 4The constant force spring is in the direction indicated by the arrow in the figure), and the winding state of the constant force spring is the compressed state, which ensures that the constant force spring can apply downward pressure to the carbon brush 12. Even if the roller motor 2 encounters vibration or slight displacement of the shaft during operation, the constant force spring can maintain the relative position of the carbon brush 12 and the rotating shaft 21 unchanged, ensuring good conductivity and reducing wear. When the carbon brush 12 is worn and the length is shortened, the constant force spring is further wound downward to ensure that the carbon brush 12 is pressed tightly against the rotating shaft 21 until the carbon brush 12 is worn to its predetermined minimum length. The spring may have reached its maximum compression limit and can no longer provide sufficient pressure to keep the carbon brush 12 in close contact with the rotating shaft 21 of the roller motor 2. At this time, a new carbon brush 12 needs to be replaced.

[0045] In this embodiment, an elastic element 143 is provided on the bracket 14 so that the carbon brush 12 can always be subjected to appropriate force and fit closely with the rotating shaft 21, thereby fixing the position of the carbon brush 12. Even if the rotating shaft 21 slightly swings or vibrates during the operation of the roller motor 2, the close contact between the carbon brush 12 and the shaft can be ensured. This avoids the intermittent discontinuity of the current between the carbon brush 12 and the rotating shaft 21 due to the poor contact between the carbon brush 12 and the rotating shaft 21 during the operation of the roller motor 2. When there is a gap between the carbon brush 12 and the rotating shaft 21, if the voltage or current exceeds a certain value, the gas will be ionized due to the excessive electric field strength, forming an arc. The arc will not only aggravate the wear of the carbon brush 12 and the rotating shaft 21, but also generate noise and interference. During the use of the carbon brush 12, the carbon brush 12 will become shorter due to wear, and the constant force spring will be further wound downward accordingly to keep the carbon brush 12 in close contact with the rotating shaft 21 at all times. In this way, even if the carbon brush 12 is worn, good conductivity between the carbon brush 12 and the rotating shaft 21 can be ensured, until the carbon brush 12 reaches its predetermined minimum length, the spring may be able to provide sufficient pressure, at which time a new carbon brush 12 needs to be replaced; a constant force spring is arranged on the inner side of the second side of the brush box 11 as an elastic element 143 to ensure stable and uniform contact between the carbon brush 12 and the roller motor 2 shaft, which not only extends the service life of the carbon brush 12, but also improves the overall economic benefits and practicality of the device.

[0046] Optionally, one end of the first frame plate 141 is connected to the first side surface 111 of the brush box 11 , and one end of the second frame plate 142 is connected to the second side surface 112 of the brush box 11 .

[0047] Optionally, the other end of the first frame plate 141 is fixedly connected to the other end of the second frame plate 142 .

[0048] Optionally, the second side surface 112 is located opposite to the first side surface 111 .

[0049] Specifically, Figure 2 and Figure 3As shown, one end of the first mounting plate 141 is connected to the first side surface 111 of the brush box 11, and one end of the second mounting plate 142 is connected to the second side surface 112 of the brush box 11. These two side surfaces are two opposite side surfaces of the brush box 11. In addition, the end of the first mounting plate 141 that is not connected to the brush box 11 is fixedly connected to the end of the second mounting plate 142 that is not connected to the brush box 11, forming a stable overall structure, ensuring that the entire shaft current elimination device 1 can remain stable during the operation of the roller table motor 2 and will not shift or become loose due to the vibration of the roller table motor 2.

[0050] In this embodiment, one end of the first mounting plate 141 is connected to the first side surface 111 of the brush box 11, and one end of the second mounting plate 142 is connected to the second side surface 112 of the brush box 11. The two side surfaces are opposite to each other. The other end of the first mounting plate 141 is fixedly connected to the other end of the second mounting plate 142, so that a stable frame structure is formed on both sides of the brush box 11 by the bracket 14, increasing the structural stability of the entire device and ensuring that the bracket 14 will not deform or shift during the vibration or operation of the roller table motor 2. Firmly connecting the first mounting plate 141 and the second mounting plate 142 to the brush box 11 and also fixedly connecting them to each other can effectively reduce the influence of the vibration during the operation of the roller table motor 2 on the shaft current elimination device 1 and ensure the stable contact between the carbon brush 12 and the rotating shaft 21.

[0051] Optionally, a buckle 144 is provided on the outer side of the first mounting plate 141, and a mounting hole 1111 adapted to the buckle (144) is provided on the first side surface 111 of the brush box 11. The first mounting plate 141 is connected to the first side surface 111 through the buckle 144.

[0052] Specifically, as Figure 3 and Figure 7 shown, a buckle 144 is provided on the outer side of the first mounting plate 141 (i.e., the side where the first mounting plate 141 contacts the first side surface 111), and a mounting hole 1111 is provided on the first side surface 111. The mounting hole 1111 is accurately docked with the buckle 144. The buckle 144 can be formed by obliquely welding a metal plate smaller than the mounting hole 1111 on the second mounting plate 142. By inserting the buckle 144 into the mounting hole 1111, the first mounting plate 141 can be quickly and firmly connected to the first side surface 111. This connection method is both simple and effective, facilitating assembly and disassembly, and at the same time ensuring the structural stability of the bracket 14.

[0053] In this embodiment, a buckle 144 is provided on the outer side of the first frame plate 141, that is, on the side in contact with the first side 111 of the brush box 11, so as to be connected with the first side 111 of the brush box 11. This not only simplifies the assembly process of the bracket 14, making the installation of the bracket 14 very simple, but also the buckle 144 structure has good elasticity and strength, ensuring that when the roller motor 2 is running, the stability and tightness between the bracket 14 and the brush box 11 will not be loosened or shifted during operation. Compared with traditional screws or welding methods, the buckle 144 connection provides higher assembly flexibility. A significant advantage of the buckle 144 design is that it is easy to disassemble, which can provide convenience during the installation and replacement of the carbon brush 12.

[0054] Optionally, the connection structure 13 is a screw rod, and the bearing outer cover 22 is provided with a thread 221 adapted to one end of the screw rod.

[0055] Optionally, the second side surface 112 of the brush box 11 is provided with a circular hole 1121 , and the circular hole 1121 is provided with an internal thread adapted to the other end of the screw rod.

[0056] Specifically, Figure 5 and Figure 6 As shown, the bearing outer cover 22 of the roller motor 2 is a part of the bearing seat of the roller motor 2, which is used to protect the bearing and seal the external environment of the bearing. It is usually a cover installed on the outside of the bearing seat of the roller motor 2, which plays the role of isolating the internal bearing from the external environment, and also plays the role of fixing the bearing. A thread can be set on the bearing outer cover 22 of the roller motor 2 to install the fixed shaft current elimination device 1. The thread size can be determined by the type of thread (metric or imperial), diameter, pitch and other parameters according to the specifications of the components to be installed (such as screws). On the adjacent side of the brush box 11 and the bearing outer cover 22 of the roller motor 2, a hole matching the size of the screw is set at the position of the rotating shaft 21 of the roller motor 2 where the carbon brush 12 can be in close contact, and a thread matching the texture on the screw is set on the hole. The brush box 11 is connected to the bearing outer cover 22 of the roller motor 2 by a screw. This connection method tightly connects the shaft current eliminating device 1 and the bearing outer cover 22 of the roller motor 2 through a screw, which not only ensures the stability of the structure but also facilitates maintenance and disassembly.

[0057] In this embodiment, the connection is made by means of screws, which has good installation convenience and easy disassembly. When maintenance or component replacement is required, the operation can be completed quickly, saving time and cost. Through screw connection, a tight and stable connection between the bearing outer cover 22 and the brush box 11 is ensured, avoiding loosening or falling off caused by vibration during the operation of the roller path motor 2. Using screw connection can conveniently adjust the relative position between the bearing outer cover 22 and the brush box 11, ensuring a tight fit between the carbon brush 12 and the shaft of the roller path motor 2. It can be applied to motors with different center heights, improving the adaptability and flexibility of the device. It also helps to ensure good contact between the carbon brush 12 and the shaft of the roller path motor 2, improving the reliability of the device and the performance of the roller path motor 2.

[0058] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A shaft current elimination device for a roller motor, characterized in that: The shaft current eliminating device (1) is used to be connected to the rotating shaft (21) of the roller motor (2), and the shaft current eliminating device (1) comprises a brush box (11), a carbon brush (12) and a connecting structure (13); Wherein, the connection structure (13) is fixed on the brush box (11), and the connection structure (13) is used to be connected to the bearing outer cover (22) of the roller motor (2); The carbon brush (12) is placed in the brush box (11), and one end of the carbon brush (12) is used to fit tightly with the rotating shaft (21) of the roller motor (2).

2. The shaft current elimination device according to claim 1, characterized in that: The shaft current elimination device (1) further comprises: a bracket (14), the bracket (14) being fixed above the brush box (11), an elastic element (143) being arranged in the bracket (14), the elastic element (143) being in a compressed state, one end of the elastic element (143) being connected to the bracket (14), and the other end of the elastic element being tightly fitted to the other end of the carbon brush (12).

3. The shaft current elimination device according to claim 2, characterized in that: The elastic element (143) is a constant force spring.

4. The shaft current elimination device according to claim 3, characterized in that: The support (14) comprises a first frame plate (141) and a second frame plate (142) connected to each other, the free end (1431) of the elastic element (143) is fixedly connected to the inner side of the first frame plate (141), and the winding direction of the elastic element (143) is downward.

5. The shaft current elimination device according to claim 4, characterized in that: One end of the first frame plate (141) is connected to the first side surface (111) of the brush box (11), and one end of the second frame plate (142) is connected to the second side surface (112) of the brush box (11).

6. The shaft current elimination device according to claim 5, characterized in that: The other end of the first frame plate (141) is fixedly connected to the other end of the second frame plate (142).

7. The shaft current elimination device according to claim 5, characterized in that: The second side surface (112) is located opposite to the first side surface (111).

8. The shaft current elimination device according to claim 4, characterized in that: A buckle (144) is provided on the outer side of the first frame plate (141), a mounting hole (1111) adapted to the buckle (144) is provided on the first side surface (111) of the brush box (11), and the first frame plate (141) and the first side surface (111) are connected via the buckle (144).

9. The shaft current elimination device according to claim 1, characterized in that: The connection structure (13) is a screw rod, and the bearing outer cover (22) is provided with a thread (221) adapted to one end of the screw rod.

10. The shaft current elimination device according to claim 9, characterized in that: The second side surface (112) of the brush box (11) is provided with a circular hole (1121), and the circular hole (1121) is provided with an internal thread adapted to the other end of the screw rod.

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