Isolating switch

Abstract

The invention relates to the technical field of disconnecting switches, and provides a disconnecting switch which comprises a rotating shaft, a movable contact piece, a cam disc, a torsion spring, a rotating disc linked with the rotating shaft and a first elastic limiting assembly used for preventing the rotating disc from rotating. The torsion spring is provided with two outer arms, the cam disc and the rotary disc are provided with a first positioning column and a second positioning column respectively, the two outer arms are located on the two sides of the first positioning column and the two sides of the second positioning column respectively, and the cam disc is provided with a first cam angle used for enabling the first elastic limiting assembly to release the limiting state of the rotary disc.

Description

Technical Field

[0001] The present invention relates to the technical field of isolating switches, and in particular to an isolating switch. Background Art

[0002] When repairing electrical equipment, it is necessary to cut off the power supply, isolate the live parts, and maintain an effective isolation distance. In the prior art, isolating switches are usually used to achieve this. In order to improve operating efficiency, traditional switches need to be manually pressed or rotated to achieve on-off operations. However, during the operation of the DC switch, arcs will be generated when the contacts are separated or closed, which will generate excessive heat and sparks inside the switch, which can easily cause safety accidents. Summary of the invention

[0003] The present invention provides an isolating switch, which can realize the rapid closing and disconnection of a fast contact piece of a contact, thereby reducing the heat and sparks generated inside the switch and reducing safety hazards.

[0004] The technical solution of the present invention is as follows:

[0005] An isolating switch comprises a rotating shaft and a moving contact piece, wherein the rotating shaft and the moving contact piece are linked, and comprises a cam plate, a torsion spring, a rotating disk linked to the rotating shaft, and a first elastic limiting component for preventing the rotating disk from rotating;

[0006] The torsion spring has two outer arms, and the cam plate and the rotating plate are respectively provided with a first positioning column and a second positioning column, the two outer arms are respectively located on both sides of the first positioning column and on both sides of the second positioning column, and the cam plate is provided with a first cam angle for allowing the first elastic limiting component to release the limiting state of the rotating plate.

[0007] Furthermore, it comprises a base for fixing the first elastic limiting assembly, and the base is provided with a first fixing groove;

[0008] The first elastic limiting assembly includes a limiting block and an elastic member, the limiting member is located in the first fixing groove, and two ends of the elastic member are respectively fixedly connected to the limiting member and the inner wall of the first fixing groove;

[0009] A limiting groove is provided on the side of the rotating disk, and one end of the limiting member away from the elastic member extends out of a first fixing groove and is located in the limiting groove.

[0010] Furthermore, the first cam angle is located on the side of the cam disc and is integrally formed with the cam disc;

[0011] An end of the limiting block away from the elastic member is provided with an inclined surface which can completely enter the limiting groove, and an end of the first cam angle away from the cam plate can abut against the inclined surface.

[0012] Furthermore, the rotating disk is provided with a mounting groove for mounting the cam disc, the limiting groove is communicated with the mounting groove, and the first cam angle is located in the limiting groove.

[0013] Furthermore, it comprises a transmission shaft for being linked with the knob, the transmission shaft is linked with the cam plate, and the torsion spring is sleeved on the transmission shaft.

[0014] Furthermore, the cam plate is coaxially arranged with the rotating plate;

[0015] The base is provided with a circular groove for accommodating the turntable and supporting the turntable to rotate with the rotating shaft as the axis. The first fixed groove is located at one side of the circular groove and is communicated with the circular groove.

[0016] Furthermore, it comprises a second elastic limiting assembly having the same structure as the first elastic limiting assembly, the base is provided with a second fixing groove for fixing the second elastic limiting assembly, and a second cam angle is provided on the side of the cam disc, the second cam angle has the same structure as the first cam angle, and is symmetrically arranged with the axis of the cam disc as the center;

[0017] The first elastic limiting assembly and the second elastic limiting assembly are circumferentially arranged with the axis of the rotating disk as the center, and the included angle between the first elastic limiting assembly and the second elastic limiting assembly is smaller than the included angle between the first cam angle and the second cam angle.

[0018] Furthermore, the second positioning column is located on a side of the rotating disk away from the limiting groove;

[0019] The end of the limiting block is in a stepped structure and comprises an extending end and a fixed end. A reinforcing groove for the fixed end to be inserted is provided on the side wall of the turntable at the middle of the limiting groove.

[0020] Furthermore, the first cam angle, the second cam angle and the first positioning column are evenly distributed in the circumferential direction with the rotation axis of the cam disc as the center;

[0021] A slide groove is provided on the base, and a slider is provided on the outer side of the turntable. The slider moves in the slide groove as the turntable rotates, and limits the rotation angle of the turntable through the two side walls of the slide groove.

[0022] Furthermore, the position where the first cam angle abuts against the corresponding limit block and the position where the second cam angle abuts against the corresponding limit block are both arc surfaces;

[0023] Furthermore, both the first positioning column and the second positioning column are cubic structures.

[0024] The working principle and beneficial effects of the present invention are:

[0025] When the staff turns the handle of the present invention, the torsion spring stores force, and then quickly drives the moving contact piece and the static contact piece to close or disconnect during the torsion spring reset process, which can reduce the arcing time of the current, avoid excessive heat and sparks, reduce safety risks, and operate conveniently and efficiently. At the same time, it can also reduce the loss of current to the switch and extend the service life of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 A perspective view of the present invention;

[0028] Figure 2 It is an internal schematic diagram of the present invention;

[0029] Figure 3 It is a partial schematic diagram of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the turntable in the present invention;

[0031] Figure 5 Schematic diagram of the structure of the limit block in the present invention (same structure as the limit block in the second elastic limit assembly);

[0032] Figure 6 It is a structural schematic diagram of the present invention;

[0033] Figure 7 It is a partial cross-sectional view of the present invention.

[0034] In the figure: 1. rotating shaft; 2. moving contact piece; 3. base; 31. first fixed groove; 32. second fixed groove; 33. circular groove; 35. sliding groove; 4. cam plate; 41. first positioning column; 42. first cam angle; 43. second cam angle; 5. rotating plate; 51. second positioning column; 52. limiting groove; 521. reinforcement groove; 53. mounting groove; 54. sliding block; 6. first elastic limiting assembly; 61. limiting block; 611. extension end; 612. fixed end; 62. elastic member; 7. second elastic limiting assembly; 8. torsion spring; 81. outer arm; 9. transmission shaft. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] like Figure 1-4 6-7, an isolating switch includes but is not limited to a knob, a terminal, an operation panel, a rotating shaft 1, a static contact piece and a moving contact piece 2. The matching relationship between the rotating shaft 1, the terminal, the static contact piece and the moving contact piece 2 and other conventional structures is not described in detail in this embodiment. The rotating shaft and the moving contact piece 2 can be linked by plug-in assembly to achieve on-off with the static contact piece.

[0038] In order to achieve rapid connection or disconnection between the stationary contact piece and the moving contact piece 2, the present embodiment is provided with a cam plate 4, a torsion spring 8, a rotating disk 5 linked to the rotating shaft 1, and a first elastic limiter assembly 6 for preventing the rotating disk 5 from rotating. A transmission shaft 9 is further provided so that the rotating shaft and the transmission shaft 9 work independently. A square hole is provided on the top of the transmission shaft 9 for connecting and linking with the knob. At the same time, the transmission shaft 9 is linked to the cam plate 4, and the torsion spring 8 is sleeved on the transmission shaft 9.

[0039] The specification of the torsion spring 8 selected in this embodiment is a hollow spiral structure, and the two ends of the torsion spring 8 have two integrally arranged outer arms 81 extending toward the side of itself. Then, a first positioning column 41 and a second positioning column 51 are respectively provided on the cam plate 4 and the rotating plate 5, and the two outer arms 81 of the torsion spring 8 are respectively located on both sides of the first positioning column 41 and the second positioning column 51.

[0040] In this embodiment, the rotating shaft 1 and the rotating disk 5 can be fixed by plugging or other means to achieve linkage. In order to switch the rotating disk 5 between the rotatable state and the fixed state, the cam disk 4 is also equipped with a first cam angle 42 for releasing the first elastic limiting component 6 from limiting the rotating disk 5. The first cam angle 42 is located on the side of the cam disk 4 and is integrally formed with the cam disk 4 to ensure its structural strength.

[0041] In order to install the first elastic limiting component 6, the present embodiment is provided with a base 3, and a first fixing groove 31 is provided on the surface of the base 3. The first elastic limiting component 6 mainly includes a limiting block 61 and an elastic member 62, and the elastic member 62 is preferably a reset spring. The limiting member is installed in the first fixing groove 31, and the two ends of the elastic member 62 are respectively fixedly connected to the limiting member and the inner wall of the first fixing groove 31, so that the limiting member can extend out of the first fixing groove 31 under the push of the elastic member 62, or the elastic member 62 can be compressed under the extrusion of an external force, so that the limiting member retreats into the first fixing groove 31.

[0042] The limiting member cooperates with the limiting groove 52 provided on the side of the rotating disk 5. When the limiting groove 52 is located opposite to the limiting member, the end of the limiting member away from the elastic member 62 can extend out of the first fixing groove 31 under the action of the elastic member 62 and be located in the limiting groove 52. At the same time, the limiting groove 52 can be designed as a strip structure to increase the angle range of the rotating disk 5 for the limiting member to enter the limiting groove 52.

[0043] In this embodiment, one end of the first cam angle 42 is set as an arc surface, and then an inclined surface that can completely enter the limiting groove 52 is provided at the end of the limiting block 61 away from the elastic member 62. During the rotation of the cam plate 4, the end of the first cam angle 42 away from the cam plate 4 is driven to abut against the inclined surface, and the first cam angle 42 is ensured not to affect the rotation of the rotating plate 5.

[0044] Since the present embodiment has a mounting groove 53 for mounting the cam plate 4 on the turntable 5 , the present embodiment has a more compact structure and a smaller overall volume. The limiting groove 52 is connected to the mounting groove 53 , so the first cam angle 42 needs to be located in the limiting groove 52 .

[0045] At the same time, the base 3 is provided with a circular groove 33 for accommodating the turntable 5 and supporting the turntable 5 to rotate around the rotation axis. The first fixing groove 31 is located on one side of the circular groove 33 and is connected to the circular groove 33 so that the limiting member can smoothly enter the limiting groove 52.

[0046] The cam plate 4 is coaxially arranged with the rotating plate 5, and keeps the same rotation axis as the rotating shaft and the transmission shaft 9, thus saving radial space occupied by the switch.

[0047] In addition, the first positioning column 41 is located inside the second positioning column 51 by default, and the first cam angle 42 is located between the first elastic limit assembly 6 and the second positioning column 51. Both the first positioning column 41 and the second positioning column 51 are cubic structures, which ensure their own structural strength and can cooperate with a stronger torsion spring 8 to further increase the speed of the switch on or off.

[0048] The working process of this embodiment is:

[0049] 1. In the default state, the limit block 61 in this embodiment is located in the limit slot 52, and the side of the limit block 61 abuts against the side of the limit slot 52, thereby clamping the turntable 5, and the turntable 5 cannot rotate;

[0050] 2. When the operator needs to disconnect or connect the moving contact piece 2 and the stationary contact piece, turn the knob, and the knob will rotate the transmission shaft 9 and the cam plate 4 (the rotation direction is the direction of the arc surface of the first cam angle 42 facing the position of the limit block 61, or Figure 2 counterclockwise as shown);

[0051] 3. When the cam plate 4 rotates, the first positioning column 41 pushes one outer arm 81 of the torsion spring 8 to rotate. Since the turntable 5 is stuck by the limit block 61 and cannot rotate, the other outer arm 81 of the torsion spring 8 is supported by the second limit block 61 on the turntable 5. Therefore, under the push of the first positioning column 41, the two outer arms 81 of the torsion spring 8 gradually open and begin to store force and energy.

[0052] 4. During the process of the torsion spring 8 storing force, as the arc surface on the first cam angle 42 contacts the limit block 61 (at this time, the central angle formed by the two outer arms of the torsion spring 8 is about 90°), the operator continues to turn the knob, and the first cam angle 42 squeezes the inclined surface on the limit block 61, so that the limit block 61 is subjected to an oblique force and moves toward the first fixing groove 31;

[0053] 5. When the inclined surface on the limit block 61 moves to the edge of the opening of the limit slot 52, since the torsion spring 8 is in the force storage state at this time, the side wall of the limit slot 52 also squeezes the limit block 61 under the force of the torsion spring 8, so that the limit block 61 is accelerated to move toward the first fixed slot 31 and retract under the oblique force;

[0054] 6. When the limit block 61 leaves the limit groove 52, the turntable 5 is in a rotatable state (at this time, the limit block 61 abuts against the side wall of the turntable 5), and because the staff is still controlling the knob (equivalent to fixing the knob and the transmission shaft 9), under the force of the torsion spring 8 to reset, the turntable 5 loses its limit at the moment when the outer arm 81 of the torsion spring 8 accelerates and pushes the second positioning column 51 to quickly rotate faster than the other outer arm 81 under the strong torsion action;

[0055] The rotation of the second positioning column 51 causes the rotating disk 5, the rotating shaft 1 and the moving contact piece 2 to rotate rapidly, thereby achieving the purpose of quickly disconnecting the isolating switch.

[0056] If resetting is required, the knob can be reversed to allow the limit block 61 to re-enter the limit slot 52 .

[0057] During this rotation process, the rotating disk 5 is linked with the rotating shaft 1 and the moving contact piece 2 to rotate rapidly to disconnect or close with the stationary contact piece. At the same time, when the first cam angle 42 completes its work, the circumferential length of the limiting groove 52 is designed to leave the first elastic limiting component 6 after the torsion spring 8 unloads the force, and abut the limiting block 61 through the side wall of the rotating disk 5.

[0058] Embodiment 2

[0059] like Figure 2 , 3As shown in , 4, and 6, on the basis of the first embodiment, this embodiment can realize rapid connection and disconnection through the torsion spring 8 in both the on and off operations of the switch, further improving the scheme and concept based on the first embodiment. Specifically, this embodiment adds a second elastic limit component 7 with the same structure as the first elastic limit component 6, and opens a second fixing groove 32 for fixing the second elastic limit component 7 on the base 3, and the second fixing groove 32 has the same structure as the first fixing groove 31. At the same time, a second cam angle 43 is also added to the side of the cam disc 4. The second cam angle 43 has the same structure as the first cam angle 42 and is symmetrically arranged with the axis of the cam disc 4 as the center. The first cam angle 42 and the second cam angle 43 are respectively used for switching on and off, that is, one is used to make the turntable 5 rotate rapidly clockwise, and the other is used to make the turntable 5 rotate rapidly counterclockwise.

[0060] In addition, in this embodiment, the first elastic stopper assembly 6 and the second elastic stopper assembly 7 are arranged circumferentially with the axis of the turntable 5 as the center, and the angle between the first elastic stopper assembly 6 and the second elastic stopper assembly 7 is smaller than the angle between the first cam angle 42 and the second cam angle 43. Through such a design, when the first cam angle 42 and the first elastic stopper assembly 6 are at the same angle, that is, after the first cam angle 42 completes its work, the position of the second cam angle 43 can be located on the side of the second elastic stopper assembly 7 away from the first elastic stopper assembly 6, creating conditions for the turntable 5 to reverse and the second cam angle 43 to abut against the stopper block 61 on the second elastic stopper assembly 7.

[0061] At the same time, when the first cam angle 42 completes its work, the design of the length of the limiting groove 52 in the circumferential direction should be located at the second elastic limiting assembly 7, so that the limiting block 61 in the second elastic limiting assembly 7 can extend into it and abut the limiting block 61 in the first elastic limiting assembly 6 through the side wall of the rotating disk 5. Similarly, after the second cam angle 43 completes its work, the limiting groove 52 should be located at the first elastic limiting assembly 6, so that the limiting block 61 in the first elastic limiting assembly 6 can extend into it and abut the limiting block 61 in the second elastic limiting assembly 7 through the side wall of the rotating disk 5.

[0062] The first cam angle 42, the second cam angle 43 and the first positioning column 41 are evenly distributed around the rotation axis of the cam plate 4, which can ensure that the torsion spring 8 has enough space to store force when the turntable 5 rotates clockwise or counterclockwise.

[0063] Furthermore, the position where the first cam angle 42 abuts against the corresponding limit block 61 and the position where the second cam angle 43 abuts against the corresponding limit block 61 are both arc surfaces, so that the cooperation between the cam angle and the limit block 61 is smoother.

[0064] In addition, in order to prevent the turntable 5 from excessively rotating and leaving the set position after the torsion spring 8 accumulates force, the present embodiment further provides a slide groove 35 on the base 3, and then provides a slider 54 on the outside of the turntable 5. The slider 54 moves in the slide groove 35 as the turntable 5 rotates, and limits the rotation angle of the turntable 5 through the two side walls of the slide groove 35. According to the structural design of the present embodiment, the angle between the first elastic limiting component 6 and the second elastic limiting component 7 can be the same as the angle between the two side walls of the slide groove 35, such as 90°. The angle between the two sides of the limiting groove 52 needs to be less than 90° to avoid the simultaneous cooperation with the first elastic limiting component 6 and the second elastic limiting component 7.

[0065] The operation mode of this embodiment is opposite to that of the first embodiment, but the principle and structure are the same. That is, after the operation of the first embodiment is completed, the staff can just turn the knob in the opposite direction.

[0066] The details are as follows:

[0067] refer to Figure 2 When the transmission shaft 9 rotates clockwise, the transmission shaft 9 drives the cam plate 4 to rotate clockwise at the same time. At this time, the outer arm 81 of the torsion spring 8 is fixed on the second positioning column 51. The outer arm 81 of the torsion spring 8 slowly opens in the clockwise direction during the clockwise rotation of the cam plate 4, so that the two outer arms 81 of the torsion spring 8 form a certain opening angle. This is also a process of energy storage of the torsion spring 8. The larger the opening angle of the two outer arms 81 of the torsion spring 8, the greater the stored energy. When the cam plate 4 rotates nearly 90 degrees clockwise, the second cam angle 43 will push open the limit block 61 on the second elastic limit assembly 7. At the moment when the limit block 61 on the second elastic limit assembly 7 is pushed open, the turntable 5 accelerates to the right (i.e., clockwise) under the strong torque of the torsion spring 8 at the moment after losing the limit. Thereby achieving the purpose of quickly closing the isolating switch. At the same time, the limit block 61 in the first elastic limit assembly 6 of this embodiment will limit the turntable 5 under the action of its own elastic member 62.

[0068] Embodiment 3

[0069] like Figure 4-5 As shown, based on the above embodiment, the end of the limit block 61 is improved into a stepped structure in this embodiment, including an extension end 611 and a fixed end 612, and a reinforcement groove 521 is opened on the side wall of the turntable 5 at the middle of the limit groove 52. Inclined surfaces are arranged on both sides of the extension end 611, and the extension end 611 is located at the end of the limit block 61 closest to the turntable 5. The fixed end 612 is a rectangular structure, and when the turntable 5 is stationary, it is embedded in the reinforcement groove 521, which can improve the positioning strength of the limit block 61 on the turntable 5.

[0070] When the limit block 61 cooperates with the limit groove 52, a part of the structure of the limit block 61 is located in the first fixed groove 31 or the second fixed groove 32. The side wall of the first fixed groove 31 or the side wall of the second fixed groove 32 is used to form a lever structure to fix the turntable 5 to ensure structural strength and reliability.

[0071] At the same time, arc-shaped surfaces can also be added to the two side walls of the limit groove 52 to guide and facilitate the limit block 61 to separate from itself, reduce the resistance of the various components when the switch is turned on and off, and also bring more labor-saving operation to the staff.

[0072] In order to provide sufficient force storage space for the torsion spring 8 , in this embodiment, the default position of the second positioning column 51 is set at a side of the turntable 5 away from the limiting groove 52 .

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An isolating switch, comprising a rotating shaft (1) and a moving contact piece (2), wherein the rotating shaft and the moving contact piece (2) are linked to each other. It is characterized in that It comprises a cam plate (4), a torsion spring (8), a rotating plate (5) linked to the rotating shaft (1), and a first elastic limiting component (6) for preventing the rotating plate (5) from rotating; The torsion spring (8) has two outer arms (81), the cam plate (4) and the rotating plate (5) are respectively provided with a first positioning column (41) and a second positioning column (51), the two outer arms (81) are respectively located on both sides of the first positioning column (41) and on both sides of the second positioning column (51), and the cam plate (4) is provided with a first cam angle (42) for enabling the first elastic limiting component (6) to release the limiting state of the rotating plate (5).

2. A disconnect switch according to claim 1, It is characterized in that It comprises a base (3) for fixing a first elastic limiting component (6), wherein the base (3) is provided with a first fixing groove (31); The first elastic limiting assembly (6) comprises a limiting block (61) and an elastic member (62); the limiting member is located in the first fixing groove (31); and two ends of the elastic member (62) are respectively fixedly connected to the limiting member and the inner wall of the first fixing groove (31); A limiting groove (52) is provided on the side of the rotating disk (5); one end of the limiting member away from the elastic member (62) extends out of the first fixing groove (31) and is located in the limiting groove (52).

3. A disconnect switch according to claim 2, It is characterized in that The first cam angle (42) is located on the side of the cam disc (4) and is integrally formed with the cam disc (4); An end of the limit block (61) away from the elastic member (62) is provided with an inclined surface that can completely enter the limit groove (52), and an end of the first cam angle (42) away from the cam plate (4) can abut against the inclined surface.

4. A disconnect switch according to claim 3, It is characterized in that The rotating disk (5) is provided with a mounting groove (53) for mounting the cam disk (4); the limiting groove (52) is communicated with the mounting groove (53); and the first cam angle (42) is located in the limiting groove (52).

5. A disconnect switch according to claim 4, It is characterized in that It comprises a transmission shaft (9) for being linked with a knob, the transmission shaft (9) being linked with a cam plate (4), and the torsion spring (8) being sleeved on the transmission shaft (9).

6. The isolating switch according to claim 2, It is characterized in that The cam plate (4) and the rotating plate (5) are coaxially arranged; The base (3) is provided with a circular groove (33) for accommodating the rotating disk (5) and supporting the rotating disk (5) to rotate around the rotating shaft. The first fixed groove (31) is located on one side of the circular groove (33) and is connected to the circular groove (33).

7. A disconnect switch according to claim 6, It is characterized in that The invention comprises a second elastic limiting component (7) having the same structure as the first elastic limiting component (6); the base (3) is provided with a second fixing groove (32) for fixing the second elastic limiting component (7); a second cam angle (43) is provided on the side of the cam disc (4); the second cam angle (43) has the same structure as the first cam angle (42) and is symmetrically arranged with the axis of the cam disc (4) as the center; The first elastic limiting assembly (6) and the second elastic limiting assembly (7) are circumferentially arranged with the axis of the rotating disk (5) as the center, and the included angle between the first elastic limiting assembly (6) and the second elastic limiting assembly (7) is smaller than the included angle between the first cam angle (42) and the second cam angle (43).

8. The isolating switch according to claim 3, It is characterized in that The second positioning column (51) is located on a side of the rotating disk (5) away from the limiting groove (52); The end of the limiting block (61) is in a stepped structure and comprises an extension end (611) and a fixed end (612). A reinforcing groove (521) for the fixed end (612) to be inserted is provided on the side wall of the rotating disk (5) at the middle of the limiting groove (52).

9. The isolating switch according to claim 7, It is characterized in that The first cam angle (42), the second cam angle (43) and the first positioning column (41) are evenly distributed in the circumferential direction with the rotation axis of the cam disc (4) as the center; A slide groove (35) is provided on the base (3), and a slider (54) is provided on the outer side of the turntable (5). The slider (54) moves in the slide groove (35) as the turntable (5) rotates, and limits the rotation angle of the turntable (5) through the two side walls of the slide groove (35).

10. The isolating switch according to claim 7, It is characterized in that The position where the first cam angle (42) abuts against the corresponding limit block (61) and the position where the second cam angle (43) abuts against the corresponding limit block (61) are both arc surfaces; Furthermore, both the first positioning column (41) and the second positioning column (51) are cubic structures.

Images