Power transmission line suspension clamp temperature measuring device

Abstract

The invention discloses a power transmission line suspension clamp temperature measuring device, and relates to the technical field of suspension clamp temperature measurement, the power transmission line suspension clamp temperature measuring device comprises a temperature measuring mechanism and a mounting mechanism, the temperature measuring mechanism comprises a temperature measuring sensor used for measuring the surface temperature of a suspension clamp, the temperature measuring sensor is provided with a temperature measuring end and a wiring end, and the temperature measuring end abuts against the suspension clamp; the terminal is connected with the transmission antenna through a wire. The temperature monitoring device is used for temperature monitoring work of the suspension clamp, and solves the problem of temperature monitoring blind area coverage of important electrical fitting connection parts of a power transmission line; the device adopts a lightweight design, the connection part of the suspension clamp body does not need to be transformed, and the installation is convenient; the contact type temperature measuring sensor is adopted for measuring temperature, the measuring range is wide, the detection precision is high, signal transmission is carried out in cooperation with the transmission antenna, real-time temperature monitoring and returning and data monitoring analysis of the suspension clamp are achieved, the risk that a power transmission line wire or hardware fitting is too high in temperature, and consequently line outage is caused can be reduced to a large extent, and the working efficiency is improved. And the temperature measurement efficiency of the suspension clamp is improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature measurement of suspension wire clamps, and in particular to a temperature measurement device for a suspension wire clamp of a power transmission line. Background Art

[0002] Transmission cables play a vital role in power transmission. The stable operation of transmission cables is directly related to the reliability and safety of power supply. During the operation of transmission cables, temperature is a key monitoring indicator. Abnormal temperature changes may indicate various potential problems, such as line overload, poor contact, partial discharge, etc. If these problems are not discovered and handled in time, they may cause serious failures or even accidents, which will have a great impact on social production and life.

[0003] Traditional temperature monitoring methods have many limitations, including the failure to fully cover some monitoring objects, which leads to the temperature conditions in some key areas being easily overlooked, forming blind spots for hidden dangers. For example, the lack of monitoring of the temperature rise caused by the continuous slight friction or discharge between the suspension wire clamp and the aluminum strand of the conductor under special working conditions has caused the problem of the wire heating and breaking at the suspension wire clamp of the straight tower at an important crossing point, resulting in the suspension of high-speed trains. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problem mentioned in the above background technology that the current temperature monitoring of power transmission lines lacks monitoring of the temperature rise phenomenon caused by continuous slight friction or discharge between the suspension wire clamp and the aluminum strands of the conductor under special working conditions, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a temperature measuring device for a suspension clamp of a power transmission line, comprising a temperature measuring mechanism and an installation mechanism, wherein the temperature measuring mechanism comprises a temperature measuring sensor for measuring the surface temperature of the suspension clamp, which has a temperature measuring end and a connection terminal, and when measuring the temperature, the temperature measuring end contacts the suspension clamp, and the connection terminal is connected to a transmission antenna through a wire; the installation mechanism comprises a mounting frame detachably connected to the suspension clamp, and a protective component for fixing the temperature measuring mechanism; wherein the protective component comprises a protective block for protecting the temperature measuring sensor, and a protective shell for protecting the transmission antenna.

[0007] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, the protective block is L-shaped, and a mounting hole is provided at one end of the protective block, and the temperature measuring sensor can be detachably mounted in the mounting hole.

[0008] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, the protective block is also provided with an adjustment hole vertically intersecting the mounting hole, a fastener is provided in the adjustment hole, and one end of the fastener is in contact with the temperature sensor.

[0009] As a preferred embodiment of the temperature measuring device for the transmission line suspension clamp of the present invention, the temperature sensor has a columnar portion starting from the temperature measuring end and extending toward the wiring end, and the length of the columnar portion is greater than the length of the mounting hole, so that the temperature sensor can completely pass through the mounting hole, the adjustment hole is an internal threaded hole, and the fastener is a locking stud compatible with the mounting hole.

[0010] As a preferred solution of the transmission line suspension clamp temperature measuring device described in the present invention, wherein: the protective shell includes an upper shell, and a lower shell detachably connected to the upper shell; the main structures of the upper shell and the lower shell are the same, the upper shell and the lower shell are connected to form a receiving cavity for accommodating the transmission antenna, and corresponding semicircular grooves are provided on the opposite sides of the upper shell and the lower shell, and the two semicircular grooves on the same side are connected to form a through hole that intersects the receiving cavity and is used for threading, the transmission antenna is placed in the receiving cavity, and the signal transmission end of the transmission antenna can extend from any through hole.

[0011] As a preferred solution of the temperature measuring device for the suspension wire clamp of the power transmission line of the present invention, wherein: two symmetrically arranged cantilevers are arranged on both sides of the upper shell, the cantilevers are arranged parallel to the midline of the suspension wire clamp, and a moving block is slidably arranged on the cantilever, and the end of the protective block away from the mounting hole is rotatably connected to the moving block through a rotating assembly;

[0012] An anti-dropping block is arranged at one end of the cantilever away from the protective shell.

[0013] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, an elastic member is arranged on the moving block, and the elastic member can make the protective block tend to move toward the direction close to the suspension clamp.

[0014] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, the elastic member is a torsion spring.

[0015] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, the elastic member is a compression spring, and the two ends of the compression spring are respectively in contact with the two oppositely arranged surfaces of the protection block and the moving block.

[0016] As a preferred solution of the temperature measuring device for the transmission line suspension clamp of the present invention, the mounting frame is L-shaped, comprising a suspension portion connected to the suspension clamp and a fixed frame portion connected to the protective shell; wherein the suspension portion is plate-shaped, a gap is provided between the suspension portion and the protective shell, a circular hole is provided on the suspension portion, and the diameter of the circular hole should be larger than the diameter of the U-shaped screw on the suspension clamp.

[0017] Beneficial effects of the invention: The invention is specially used for temperature monitoring of suspension clamps, which solves the problem of blind area coverage of temperature monitoring of important electrical fittings connection parts of transmission lines; the device adopts a lightweight design, and there is no need to modify the connection parts of the suspension clamp body, and the installation is convenient; a contact temperature sensor is used for temperature measurement, with a wide measurement range and high detection accuracy, and a transmission antenna is used for signal transmission to realize real-time temperature monitoring, feedback and data monitoring and analysis of the suspension clamp, which can greatly reduce the risk of line shutdown caused by excessive temperature of transmission line conductors or fittings, and improve the efficiency of temperature measurement operations of the suspension clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1 This is a schematic diagram of the connection between the temperature measuring device and the suspension wire clamp described in the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the temperature measuring mechanism in the present invention.

[0022] Figure 4 It is a schematic diagram of the connection structure between the elastic member, the protection block and the moving block in the present invention.

[0023] Figure 5 It is a schematic diagram of another connection structure between the elastic member, the protection block and the moving block in the present invention.

[0024] Figure 6 It is a schematic diagram of the connection structure between the mounting frame and the protective shell in the present invention.

[0025] In the figure: 100, temperature measuring mechanism; 101, temperature measuring sensor; 101a, temperature measuring end; 101b, wiring terminal; 101c, columnar portion; 102, transmission antenna; 200, mounting mechanism; 201, mounting frame; 201a, suspension portion; 201a-1, round hole; 201b, fixed frame portion; 202, protection component; 202a, protection block; 202a-1, mounting hole; 202a-2, adjustment Hole; 202b, protective shell; 202b-1, upper shell; 202b-2, lower shell; H, accommodating chamber; 202b-3, semicircular groove; 202b-4, through hole; 203, fastener; 204, cantilever; 205, moving block; 206, rotating component; 206a, rotating shaft; 206b, shaft hole; 207, elastic member; 207a, torsion spring; 207b, compression spring; 208, anti-drop block. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1

[0031] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides a temperature measuring device for a suspension clamp of a power transmission line, comprising a temperature measuring mechanism 100 and a mounting mechanism 200. The temperature measuring mechanism 100 is used to monitor the surface temperature of the suspension clamp; the mounting mechanism 200 is used to connect the suspension clamp and detachably fix the temperature measuring device under the suspension clamp.

[0032] Specifically, the temperature measuring mechanism 100 includes a temperature measuring sensor 101 for measuring the surface temperature of the suspension wire clamp. The temperature measuring sensor 101 is a contact temperature measuring sensor, which has a temperature measuring end 101a and a connection terminal 101b. When measuring the temperature, the temperature measuring end 101a contacts the suspension wire clamp, and the connection terminal 101b is connected to the transmission antenna 102 through a wire. The transmission antenna 102 adopts 5G / 4G signal transmission to transmit the monitored temperature to the mobile terminal in real time.

[0033] Specifically, the temperature measurement range is -30°C to +110°C, the temperature measurement accuracy is ±0.5°C to 2°C, the total weight of the temperature measuring device is <0.3kg, the self-powered standby time is ≥180 days, and the signal transmission distance of the transmission antenna 102 can reach 200m.

[0034] In summary, compared with the traditional temperature measurement method in which operators use handheld infrared temperature measuring instruments to monitor under the pole tower, this device uses a contact temperature sensor with a wide measurement range and high detection accuracy. At the same time, it can reduce the impact of bad weather on temperature monitoring results. For example, in foggy and rainy weather, the detection results of infrared thermometers often deviate greatly from the actual data. The transmission antenna 102 is used to transmit the temperature measurement data back, and the transmission speed is fast. After installation, operators no longer need to arrive at the site for monitoring, and several temperature measuring devices can be monitored at the same time, that is, the temperature of several suspension clamps on several towers can be monitored in real time at the same time, which effectively improves the efficiency of temperature monitoring operations on transmission lines.

[0035] Example 2

[0036] Reference Figure 1 to Figure 6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the mounting mechanism 200 includes a mounting frame 201 detachably connected to the suspension wire clamp, and a protective component 202 for fixing the temperature measuring mechanism 100; wherein the protective component 202 includes a protective block 202a for protecting the temperature measuring sensor 101, and a protective shell 202b for protecting the transmission antenna 102.

[0037] Specifically, the protective block 202a is L-shaped, and a mounting hole 202a-1 is provided at one end of the protective block 202a. The temperature sensor 101 can be detachably installed in the mounting hole 202a-1. The protective block 202a is also provided with an adjustment hole 202a-2 that is vertically intersecting with the mounting hole 202a-1. A fastener 203 is provided in the adjustment hole 202a-2, and one end of the fastener 203 is in conflict with the temperature sensor 101.

[0038] Preferably, the temperature sensor 101 has a columnar portion 101c starting from the temperature measuring end 101a and extending toward the terminal 101b, and the length of the columnar portion 101c is greater than the length of the mounting hole 202a-1, so that the temperature sensor 101 can completely pass through the mounting hole 202a-1, the adjustment hole 202a-2 is an internal threaded hole, and the fastener 203 is a locking stud that is compatible with the mounting hole 202a-1.

[0039] Specifically, the protective shell 202b includes an upper shell 202b-1, and a lower shell 202b-2 detachably connected to the upper shell 202b-1. The upper shell 202b-1 and the lower shell 202b-2 are connected by bolts or clamps. Furthermore, the main structures of the upper shell 202b-1 and the lower shell 202b-2 are the same. The upper shell 202b-1 and the lower shell 202b-2 are connected to form a receiving cavity H for accommodating the transmission antenna 102, and corresponding semicircular grooves 202b-3 are provided on the opposite sides of the upper shell 202b-1 and the lower shell 202b-2. The two semicircular grooves 202b-3 on the same side are connected to form a through hole 202b-4 that intersects the receiving cavity H and is used for threading. The transmission antenna 102 is placed in the receiving cavity H, and the signal transmission end of the transmission antenna 102 can extend from any through hole 202b-4.

[0040] Furthermore, two symmetrically arranged cantilevers 204 are provided on both sides of the upper shell 202b-1, and the cantilevers 204 are connected to the upper shell 202b-1 by any connection methods such as bolt connection, welding, or clamping, preferably bolt connection; the cantilever 204 is arranged parallel to the center line of the suspension wire clamp, and a moving block 205 is slidably provided on the cantilever 204, and the end of the protective block 202a away from the mounting hole 202a-1 is rotatably connected to the moving block 205 through a rotating assembly 206, and the rotating assembly 206 can be a matching rotating shaft 206a and shaft hole 206b structure. Specifically, the rotating shaft 206a and the shaft hole 206b are respectively arranged on the protective block 202a and the moving block 205 to realize the rotational connection between the two.

[0041] Specifically, when in use, the moving block 205 on the cantilever 204 is slidably adjusted to drive the temperature sensor 101 to move horizontally and adjust the monitoring point.

[0042] Furthermore, an elastic member 207 is provided on the moving block 205, and the elastic member 207 can make the protective block 202a tend to move toward the direction close to the suspension wire clamp. When in use, when connecting the temperature measuring device and the suspension wire clamp, the elastic member 207 is in a compressed state. After installation, the elastic member 207 uses its own elastic recovery characteristics to make the end of the protective block 202a connected to the temperature sensor 101 move toward the direction close to the suspension wire clamp, and make the temperature measuring end 101a of the temperature sensor 101 abut against the lower surface of the suspension wire clamp, ensuring that the temperature sensor 101 can accurately monitor the surface temperature of the suspension wire clamp; at the same time, the external support force generated by the elastic member 207 is used to resist wind resistance, so that the temperature sensor 101 is not affected by wind and is separated from the suspension wire clamp.

[0043] Preferably, refer to Figure 4 The elastic member 207 is preferably a torsion spring 207a, and the torsion spring 207a is sleeved on the outside of the rotating shaft 206a.

[0044] Preferably, refer to Figure 5 The elastic member 207 is preferably a compression spring 207b, and both ends of the compression spring 207b are respectively in contact with two oppositely arranged surfaces of the protective block 202a and the moving block 205.

[0045] Furthermore, an anti-dropping block 208 is provided at one end of the cantilever 204 away from the protective shell 202 b.

[0046] The remaining structures are the same as those of Example 1.

[0047] Example 3

[0048] Reference Figure 1 , Figure 2 and Figure 6 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: the mounting frame 201 is L-shaped, and includes a suspension portion 201a connected to the suspension wire clamp, and a fixed frame portion 201b connected to the protective shell 202b; wherein the fixed frame portion 201b is connected to the protective shell 202b by any means such as bolt connection, welding, or clamping, preferably by bolt connection; the suspension portion 201a is in the form of a plate, and a gap is provided between the suspension portion 201a and the protective shell 202b, and a circular hole 201a-1 is provided on the suspension portion 201a, and the diameter of the circular hole 201a-1 should be larger than the diameter of the U-shaped screw on the suspension wire clamp. When in use, the end of the suspension wire clamp passes through the circular hole 201a-1 and is installed with a fixing bolt, so that the plate-shaped suspension portion 201a is clamped between the fixing bolt and the self-matching bolt on the U-shaped screw, providing a reliable connection and tightening force, and ensuring the stable and safe connection between the suspension wire clamp and the temperature measuring device.

[0049] The remaining structure is the same as that of Example 2.

[0050] In summary, the present invention is specially used for temperature monitoring of suspension clamps, which solves the problem of blind area coverage of temperature monitoring at important electrical fittings connection parts of transmission lines; the device adopts a lightweight design and does not require modification of the connection parts of the suspension clamp body, and is easy to install; a contact temperature sensor is used for temperature measurement, which has a wide measurement range and high detection accuracy, and is combined with a transmission antenna 102 for signal transmission to realize real-time temperature monitoring, feedback and data monitoring and analysis of the suspension clamp, which can greatly reduce the risk of line shutdown due to excessive temperature of transmission line conductors or fittings, and improve the efficiency of temperature measurement operations of the suspension clamp.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A temperature measuring device for a transmission line suspension clamp, characterized in that: The invention comprises a temperature measuring mechanism (100) and a mounting mechanism (200), wherein the temperature measuring mechanism (100) comprises a temperature measuring sensor (101) for measuring the surface temperature of the suspension clamp, the temperature measuring sensor having a temperature measuring end (101a) and a connection end (101b), and when measuring the temperature, the temperature measuring end (101a) contacts the suspension clamp, and the connection end (101b) is connected to a transmission antenna (102) via a wire; The mounting mechanism (200) comprises a mounting frame (201) detachably connected to a suspension wire clamp, and a protective component (202) for fixing a temperature measuring mechanism (100); wherein the protective component (202) comprises a protective block (202a) for protecting a temperature measuring sensor (101), and a protective shell (202b) for protecting a transmission antenna (102).

2. The temperature measuring device for the suspension clamp of a power transmission line according to claim 1, characterized in that: The protection block (202a) is L-shaped, and one end of the protection block (202a) is provided with a mounting hole (202a-1), and the temperature measuring sensor (101) can be detachably mounted in the mounting hole (202a-1).

3. The temperature measuring device for the suspension clamp of a power transmission line according to claim 2, characterized in that: The protection block (202a) is further provided with an adjustment hole (202a-2) vertically intersecting the mounting hole (202a-1), a fastener (203) is provided in the adjustment hole (202a-2), and one end of the fastener (203) is in contact with the temperature sensor (101).

4. The temperature measuring device for the suspension clamp of a power transmission line according to claim 3, characterized in that: The temperature sensor (101) has a columnar portion (101c) starting from a temperature measuring end (101a) and extending toward a wiring end (101b), and the length of the columnar portion (101c) is greater than the length of the mounting hole (202a-1), so that the temperature sensor (101) can completely pass through the mounting hole (202a-1), the adjustment hole (202a-2) is an internal threaded hole, and the fastener (203) is a locking stud matched with the mounting hole (202a-1).

5. The temperature measuring device for the suspension clamp of a power transmission line according to any one of claims 1 to 4, characterized in that: The protective shell (202b) comprises an upper shell (202b-1) and a lower shell (202b-2) detachably connected to the upper shell (202b-1); The upper shell (202b-1) and the lower shell (202b-2) have the same main structure. The upper shell (202b-1) and the lower shell (202b-2) are connected to form a receiving cavity (H) for accommodating the transmission antenna (102). The upper shell (202b-1) and the lower shell (202b-2) are opposite to each other and are provided with corresponding semicircular grooves (202b-3). The two semicircular grooves (202b-3) on the same side are connected to form a through hole (202b-4) that intersects the receiving cavity (H) and is used for threading. The transmission antenna (102) is placed in the receiving cavity (H), and the signal transmission end of the transmission antenna (102) can extend from any through hole (202b-4).

6. The temperature measuring device for the suspension clamp of a power transmission line according to claim 5, characterized in that: Two symmetrically arranged cantilevers (204) are provided on both sides of the upper shell (202b-1), the cantilevers (204) are arranged parallel to the center line of the suspension wire clamp, and a moving block (205) is slidably provided on the cantilever (204), and one end of the protective block (202a) away from the mounting hole (202a-1) is rotatably connected to the moving block (205) via a rotating assembly (206); An anti-fall-off block (208) is provided at one end of the cantilever (204) away from the protective shell (202b).

7. The temperature measuring device for the suspension clamp of a power transmission line according to claim 6, characterized in that: The movable block (205) is provided with an elastic member (207), and the elastic member (207) can cause the protective block (202a) to have a tendency to move towards a direction approaching the suspension wire clamp.

8. The temperature measuring device for the suspension clamp of a power transmission line according to claim 7, characterized in that: The elastic member (207) is a torsion spring (207a).

9. The temperature measuring device for a transmission line suspension clamp according to claim 7, characterized in that: The elastic member (207) is a compression spring (207b), and two ends of the compression spring (207b) are respectively in contact with two oppositely arranged surfaces of the protection block (202a) and the moving block (205).

10. The temperature measuring device for the suspension clamp of a power transmission line according to claim 1, or 2, or 3, or 4, or 6, or 7, or 9, characterized in that: The mounting frame (201) is L-shaped, and comprises a suspension portion (201a) connected to the suspension wire clamp, and a fixed frame portion (201b) connected to the protective shell (202b); wherein the suspension portion (201a) is in the shape of a plate, a gap is provided between the suspension portion (201a) and the protective shell (202b), a circular hole (201a-1) is provided on the suspension portion (201a), and the diameter of the circular hole (201a-1) should be larger than the diameter of the U-shaped screw on the suspension wire clamp.

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