Mounting structure for a ceramic heater

Abstract

A mounting structure for ceramic heaters includes a supporting assembly and a positioning and fixing assembly. The supporting assembly includes a bearing assembly, a partition assembly, and a top cover. The bearing assembly includes a bottom plate, an avoiding hole, and a plurality of bearing plates detachably connected to the bottom plate and used for bearing ceramic heaters. The partition assembly includes a first partition strip and a plurality of second partition strips. In this embodiment, the avoiding hole is divided into a plurality of small containing frames of equal size by the first partition strip and the second partition strips for placing ceramic heaters, thereby improving the space utilization of the avoiding hole. The first partition strip and the second partition strips are small in thickness, so that the distance between two adjacent ceramic heaters can be reduced, thereby improving the roasting efficiency. Moreover, since the bearing plates are detachably installed to the bottom plate, when the ceramic heaters are damaged, the bearing plates can be directly detached, and the ceramic heaters can be repaired and replaced.

Description

Technical Field

[0001] This utility model belongs to the field of heating equipment assembly technology, and in particular to an installation structure for ceramic heaters. Background Technology

[0002] A ceramic heater is a common heating device, generally used in ovens or grills, to provide heat to the oven as a heating element. A ceramic heater includes a body, a heating surface on one side of the body, and a ceramic mounting base sintered on the other side of the heater. During installation, the heating surface of the ceramic heater is oriented in the desired direction, and the ceramic mounting base is inserted through a socket hole on a mounting plate and secured to the plate, thus suspending the ceramic heater in the socket hole of the mounting plate.

[0003] For example, in utility model patent CN219955410U, multiple heating avoidance notches are made on the base plate, and ceramic heaters are fixed in the heating avoidance notches by the support plate to provide heat to the heating furnace. However, in cases where the base plate space is limited, the gaps between the multiple heating avoidance notches are too large, resulting in a limited number of ceramic heaters that can be installed in the notches, leading to low space utilization and hindering heating efficiency. Furthermore, the large gaps between the multiple heating avoidance notches can easily cause uneven heat distribution during heating, affecting the overall heating effect. Also, since the support plate is fixed to the mounting plate, when the ceramic heater is damaged, the top plate must be removed first before the ceramic heater can be removed, which is inconvenient for subsequent maintenance and replacement. Summary of the Invention

[0004] In view of this, the present invention provides an installation structure for ceramic heaters to solve the above problems.

[0005] An installation structure for a ceramic heater includes a body, a ceramic mounting base disposed on one side of the body, and a heating surface disposed on the other side of the body. The installation structure includes a support assembly for supporting the ceramic heater and a positioning and fixing assembly connected to the support assembly for positioning and fixing the ceramic heater. The support assembly includes a support component for carrying the ceramic heater and a partition assembly disposed on the support component for separating multiple ceramic heaters. The support component includes a base plate, a clearance hole formed on the base plate for placing the ceramic heater, and multiple support plates detachably connected to the base plate for carrying the ceramic heater. The partition assembly includes a first partition strip and multiple second partition strips connected to and spaced apart from the first partition strip. The first partition strip includes multiple first base plates, multiple first baffles, and multiple insertion holes formed on the first base plates. Each of the second partition strips further includes a second base plate, a second clearance portion located at one end of the second base plate, a barbed protrusion located at the other end of the second base plate, and at least one second positioning protrusion located on the second base plate. The positioning and fixing assembly includes a positioning post and a fixed support plate connected to the positioning post. The positioning post passes through the insertion hole, and a plurality of first baffles and a plurality of second baffles evenly divide the clearance hole into a plurality of small accommodating frames for placing the ceramic heater to improve the space utilization of the clearance hole. The fixed support plate and the support plate are used to support the ceramic heater.

[0006] Furthermore, the mounting structure for the ceramic heater also includes a plurality of elastic abutment members disposed between the ceramic heater and the support assembly, each elastic abutment member including an elastic spring and two elastic mounting holes disposed on the elastic spring.

[0007] Furthermore, the support assembly also includes a top cover connected to the bearing assembly. The partition assembly is welded and fixed to the top cover. The top cover includes a top plate, a plurality of through holes disposed on the top plate for the ceramic fixing seat to pass through, a plurality of positioning grooves disposed on the top plate, a plurality of mounting holes disposed on the top plate, a plurality of bending edges perpendicularly disposed on the edge of the top plate, and a plurality of mounting edges connected to the bending edges and parallel to the top plate.

[0008] Furthermore, the supporting component also includes a plurality of blocking edges formed on the base plate and located around the clearance hole, the blocking edges being vertically disposed on the base plate and surrounding the clearance hole.

[0009] Furthermore, the first partition strip also includes two first clearance portions located on both sides of the first base plate and avoiding the blocking edge, two positioning grooves located on opposite sides of each of the insertion holes, and at least two first positioning protrusions located on the first base plate.

[0010] Furthermore, the second partition bars are equally spaced on the same side of the first partition bar, the barb protrusions are used to cooperate with the positioning grooves to quickly assemble and position the first partition bar and the second partition bars, and the second clearance portion is used to avoid the blocking edge.

[0011] Furthermore, each of the positioning and fixing components also includes a fastener for fixing the fixing support plate to the positioning post.

[0012] Furthermore, the positioning post includes a positioning post body inserted into the insertion hole, a positioning protrusion located on the positioning post body and facing one end of the top plate, and two positioning plugs located at the other end of the positioning post body. The positioning protrusion has a disc-shaped structure with a notch, which is adapted to the size and shape of the mounting hole.

[0013] Furthermore, the positioning plugs are located on both sides of the threaded hole and are used to insert into the fixed support plate. The size and shape of the positioning plugs and the insertion holes on the fixed support plate are compatible. The positioning plugs are arched structures.

[0014] Compared with existing technologies, the mounting structure for ceramic heaters provided by this utility model divides the clearance hole into multiple small accommodating frames for placing the ceramic heaters through the partition assembly, and separates the ceramic heaters from each other through the first baffle and the second baffle. This helps to fully utilize the space of the clearance hole, reduce the distance between two adjacent ceramic heaters, and improve the space utilization rate of the clearance hole, which is beneficial to improving the heating area and heating uniformity. Furthermore, since the support plate and the fixed support plate are detachably fixed to the base plate and the positioning column, the damaged ceramic heater can be removed simply by removing the support plate and the fixed support plate during maintenance, making subsequent maintenance more convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an installation structure for a ceramic heater provided by this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the ceramic heater.

[0017] Figure 3 for Figure 1 An exploded view of the mounting structure used for ceramic heaters.

[0018] Figure 4 for Figure 3 A magnified view of a portion at point A.

[0019] Figure 5 for Figure 3 An exploded view of the mounting structure for ceramic heaters from another direction.

[0020] Figure 6 for Figure 3 The diagram shows the structure of the partition assembly.

[0021] Figure 7 for Figure 6 A magnified view of the structure at point B.

[0022] Figure 8 for Figure 3 An exploded view of the positioning components in the mounting structure for ceramic heaters.

[0023] Figure 9 for Figure 8 A schematic diagram of the exploded structure of the positioning component in another direction. Detailed Implementation

[0024] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0025] like Figures 1 to 9 The diagram shows a schematic of an installation structure for a ceramic heater provided by this utility model. The installation structure for the ceramic heater is used to install a ceramic heater 10. It includes a support assembly 20 for supporting and carrying the ceramic heater 10, multiple positioning and fixing assemblies 30 connected to the support assembly 20 for positioning and fixing the ceramic heater 10, and multiple elastic abutment members 40 located between the ceramic heater 10 and the support assembly 20. The installation structure for the ceramic heater also includes other functional modules, such as an installation structure disposed on the support assembly for mounting the support assembly onto the furnace body, etc. These are technologies known to those skilled in the art and will not be described in detail here.

[0026] like Figure 2As shown, the ceramic heater 10 itself is prior art. The ceramic heater 10 has been described in utility model patent publication CN219955410U. The ceramic heater 10 includes a body 11, a ceramic mounting base 12 disposed on one side of the body 11 for mounting the body 11, and a heating surface 13 disposed on the other side of the body 11 for heating an object.

[0027] like Figure 3 As shown, the support assembly 20 includes a support assembly 21 for supporting the ceramic heater 10, a partition assembly 22 disposed on the support assembly 21 for separating the plurality of ceramic heaters 10, and a top cover 23 connected to the support assembly 21 and used to cooperate with the support assembly 21 to fix the ceramic heater 10.

[0028] The supporting component 21 includes a base plate 211, a clearance hole 212 formed on the base plate 211 for placing the ceramic heater 10, a plurality of blocking edges 213 disposed on the base plate 211 and located around the clearance hole 212, and a plurality of supporting plates 214 detachably connected to the base plate 211 for supporting the ceramic heater 10.

[0029] The base plate 211 can be a rectangular plate. The base plate 211 can be fixed to the furnace body of the heating furnace by bolts or other fasteners. The base plate 211 can be made of metal materials such as steel, thus having better load-bearing capacity.

[0030] The clearance hole 212 is used to insert the ceramic heater 10, so that the heating surface 13 of the ceramic heater 10 directly faces the object being heated, ensuring the heating effect. The clearance hole 212 can be a rectangular hole. Compared with the utility model with publication number CN219955410U, this utility model reduces the spacing between multiple ceramic heaters 10 by removing the separator plate with a large gap in the middle and making multiple clearance notches into one piece.

[0031] The blocking flange 213 is vertically disposed on the base plate 211 and surrounds the periphery of the clearance hole 212. It is understood that the blocking flange 213 is integrally formed with the base plate 211 and is created by bending. The blocking flange 213 is used to cooperate with the partition assembly 22 to restrict the horizontal movement of the ceramic heater 10, i.e., to fix the horizontal position of the ceramic heater 10.

[0032] The support plate 214 is used to cooperate with the positioning and fixing assembly 30 to fix the ceramic heater 10 on the base plate 211, and can be detachably connected to the base plate 211 by screws. The support plate 214 includes four first support plates 215 located at the four corners of the clearance holes 212, and a plurality of second support plates 216 located on the periphery of the clearance holes 212.

[0033] The first support plate 215 is disposed at the four corners of the clearance hole 212. To avoid obstructing the heating surface 13, the first support plate 215 should be made as small as possible, preferably able to support one corner of the heating surface 13. Therefore, the first support plate 215 has only one bolt hole and is fixed to the base plate 211 by a bolt. Each first support plate 215 includes a first support plate body 2151 located at one corner of the clearance hole 212, and a limiting part 2152 connected to the first support plate body 2151 and inserted into the base plate 211.

[0034] The limiting part 2152 can be a rectangular plate, one end of which is connected to the first support plate body 2151, and the other end passes through the base plate 211 to limit the position of the first support plate 215, thereby facilitating the assembly of the first support plate 215 and the support of the ceramic heater 10. Of course, the first support plate 215 must also be fastened to the base plate 211 by fasteners such as screws. Since the clearance hole 212 has four corners, the first support plate 215 has four of these holes.

[0035] The second support plate 216 is located on the four periphery of the clearance hole 212. Therefore, two screw holes can be provided on the second support plate 216 to restrict its movement. The second support plate 216 can also be designed with a structure similar to the first support plate 215, which has only one bolt hole. No specific limitation is made here.

[0036] The number of the second support plates 216 can be set according to actual needs. In this embodiment, there are eight ceramic heaters 10, arranged in two rows and four columns, therefore there are eight second support plates 216.

[0037] like Figure 6 and Figure 7 As shown, the partition assembly 22 is welded and fixed to the top cover 23, and includes a first partition strip 221 and a plurality of second partition strips 222 connected to and spaced apart from the first partition strip 221. The first partition strip 221 is arranged along the length direction of the clearance hole 212. The plurality of second partition strips 222 are spaced apart along the width direction of the clearance hole 212.

[0038] The first dividing strip 221 includes a first base plate 2211 fixed to the top cover 23, a plurality of first baffles 2212 located on the first base plate 2211, two first clearance portions 2213 located on both sides of the first base plate 2211 and abutting against the blocking edge 213, a plurality of insertion holes 2214 opened on the first base plate 2211, two positioning grooves 2215 located on opposite sides of each insertion hole 2214, and at least two first positioning protrusions 2216 located on the first base plate 2211 and facing the top cover 23.

[0039] The first base plate 2211 is attached to the top cover 23 and welded in place.

[0040] The first baffle 2212 divides the clearance hole 212 into two parts. Preferably, the first baffle 2212 divides the clearance hole 212 into two equal parts.

[0041] The first avoidance part 2213 is used to avoid the blocking edge 213 in order to avoid mutual interference.

[0042] The plurality of insertion holes 2214 are located at the intersection of the first partition bar 221 and the second partition bar 222, but are only formed on the first partition bar 221. The insertion holes 2214 are used for inserting and assembling the positioning and fixing component 30.

[0043] The positioning groove 2215 is used to cooperate with the second dividing strip 222 to position the second dividing strip 222, thereby ensuring that the positions of the multiple second dividing strips 222 are equally divided by the first dividing strip 221. The specific cooperation principle will be described below together with the second dividing strip 222.

[0044] The first positioning protrusion 2216 is inserted into the corresponding positioning hole of the abutment cover 23, so that the abutment cover 23 can be quickly installed on the separator assembly 22 to facilitate subsequent welding. Its specific working principle will be explained below in conjunction with the abutment cover 23.

[0045] The second partition bars 222 are equally spaced on the same side of the first partition bar 221. Each second partition bar 222 is also welded to the abutment cover 23 and includes a second base plate 2221, a second baffle 2222 formed on the second base plate 2221, a second clearance portion 2223 located at one end of the second base plate 2221, a barbed protrusion 2224 located at the other end of the second base plate 2221, and at least one second positioning protrusion 2225 located on the second base plate 2221. The second partition bars 222 are equally spaced on the same side of the first partition bar 221.

[0046] One end of the second baffle 2222 abuts against the first baffle 2212, and the other end faces the blocking edge 213, thereby dividing the area of ​​the clearance hole 212 in the length direction.

[0047] The second avoidance part 2223 is also used to avoid the blocking edge 213 in order to avoid mutual interference.

[0048] The barbed protrusion 2224 is used to cooperate with the positioning groove 2215 to quickly determine the position between the second separator 222 and the first separator 221, so as to facilitate welding the second separator 222 and the first separator 221 onto the top cover 23. Specifically, the barbed protrusion 2224 is adapted to the size and shape of the positioning groove 2215. When the barbed protrusion 2224 is engaged with the positioning groove 2215, the second separator 222 and the first separator 221 are horizontally connected and fixed, thereby positioning the first separator 221 and the second separator 222 to facilitate subsequent welding and fixing.

[0049] The second positioning protrusion 2225 is inserted into the positioning hole of the abutment cover 23, so that the abutment cover 23 can be quickly positioned and fixed with the separator component 22 to facilitate subsequent welding.

[0050] It is easy to see that, through the first baffle 2212 and the second baffle 2222, and in cooperation with the blocking edge 213, the clearance hole 212 is divided into multiple relatively small receiving frames for placing the ceramic heater 10. Furthermore, the receiving frames formed by the blocking edge 213, the multiple first baffles 2212, and the second baffles 2222 can also horizontally restrict the positions of the multiple ceramic heaters 10. Since the thickness of both the first dividing strip 221 and the second dividing strip 222 is relatively small, the distance between two ceramic heaters 10 can be reduced, thereby increasing the heat output area and improving the roasting efficiency.

[0051] like Figure 3 and Figure 5 As shown, the top cover 23 includes a top plate 231, a plurality of through holes 232 disposed on the top plate 231 for the ceramic fixing seat 12 to pass through, a plurality of positioning holes 233 disposed on the top plate 231, a plurality of mounting holes 234 disposed on the top plate 231, a plurality of bending edges 235 perpendicularly disposed on the edge of the top plate 231, and a plurality of mounting edges 236 connected to the bending edges 235 and parallel to the top plate 231.

[0052] The top plate 231 is used to cooperate with the support plate 214 and the positioning and fixing component 30 provided on the bottom plate 211 to fix the ceramic heater 10 in the vertical direction.

[0053] The positioning hole 233 is adapted to the size and shape of the first positioning protrusion 2216 and the second positioning protrusion 2225. During assembly, simply insert the first positioning protrusion 2216 and the second positioning protrusion 2225 into the positioning hole 233 respectively, and the top plate 231 and the partition assembly 22 will be relatively fixed, thereby achieving the purpose of quickly pre-assembling the top plate 231 and the partition assembly 22, so as to facilitate the subsequent welding of the partition assembly 22 onto the top plate 231.

[0054] The mounting hole 234 is used to mate with the positioning protrusion 33 described below, so as to quickly install the positioning and fixing component 30 on the top plate 231.

[0055] The height of the bending edge 235 is greater than the height of the blocking edge 213, thereby allowing space for the vertical vibration of the ceramic heater 10.

[0056] The mounting edge 236 is used to fix the top cover 23 to the base plate 211. The mounting edge 236 and the base plate 211 can be fixed together by bolts.

[0057] like Figure 8 and Figure 9 As shown, the positioning and fixing assembly 30 includes a positioning post 31 inserted into the insertion hole 2214, a fixing support plate 32 disposed on the positioning post 31 and used to abut against the ceramic heater 10, and a fastener 33 for fixing the fixing support plate 32 on the positioning post 31.

[0058] The positioning post 31 includes a positioning post body 311 inserted into the insertion hole 2214, a positioning protrusion 312 located on the positioning post body 311 and facing one end of the abutment plate 231, and two positioning plugs 313 located at the other end of the positioning post body 311. It is easy to see that the positioning post 31 also includes a threaded hole 314 formed inside the positioning post body 311 for engaging with the fastener 33.

[0059] The positioning post body 311 can be a cylinder. The positioning post body 311 is inserted into the insertion hole 2214 and fixed to the top cover 23 by welding.

[0060] The positioning protrusion 312 has a notched disc-shaped structure that matches the size and shape of the mounting hole 234. When the positioning protrusion 312 is engaged with the mounting hole 234, the abutment plate 231 can be quickly pre-assembled onto the positioning and fixing assembly 30, and the direction of the positioning post 31 can be defined, thereby defining the position of the fixed bearing plate 32.

[0061] The positioning plugs 313 are located on both sides of the threaded holes 314 and are used to insert into the fixed support plate 32. The size and shape of the positioning plugs 313 and the insertion holes on the fixed support plate 32 are compatible. The positioning plugs 313 have an arched structure, and the positioning of the positioning plugs 313 can be designed so that the fixed support plate 32 is located at the angle formed by the first partition strip 221 and the second partition strip 222.

[0062] The fixed support plate 32 is used to cooperate with the support plate 214 to fix the ceramic heater 10 in the clearance hole 212. The fixed support plate 32 can be made of metal materials such as steel, thus having better load-bearing capacity. The fixed support plate 32 can be a rectangular plate. It is conceivable that the area of ​​the fixed support plate 32 should be as small as possible, so as to reduce the obstruction to the heating surface of the ceramic heater 10 while abutting and fixing it, thereby reducing the impact on its heating effect.

[0063] The fastener 33 is screwed into the threaded hole 314 to fix the fixed support plate 32 onto the positioning post 31. The fastener 33 can be a screw; specifically, the screw passes through the fixed support plate 32 and is screwed into the threaded hole 314, thereby fixing the fixed support plate 32 onto the positioning post 31.

[0064] like Figure 3 and Figure 5 As shown, the elastic abutment 40 includes an elastic spring 41 and two elastic mounting holes 42 disposed on the elastic spring 41. It is understood that both ends of the elastic spring 41 are bent to form an arched structure, and the bent ends abut against the ceramic heater 10. The elastic spring 41 can also be fixed to the abutment plate 231 by a blind rivet. When the ceramic heater 10 is subjected to an upward impact, the ceramic heater 10 will compress the elastic spring 41. At this time, the elastic spring 41 will deform to buffer the impact force, thereby preventing the ceramic fixing seat 12 from colliding with the through hole 232 of the abutment cover 23 and damaging the ceramic fixing seat 12. It is not difficult to imagine that the elastic abutment 40 can also be an elastic abutment of other shapes, such as a coil spring, with one end of the coil spring fixed to the abutment plate 231.

[0065] Compared with the prior art, the installation structure for ceramic heaters provided by this utility model divides the clearance hole 212 into multiple small accommodating frames for placing the ceramic heaters 10 evenly through the partition assembly 22, and separates the ceramic heaters 10 from each other through the first baffle 2212 and the second baffle 2222. This helps to make full use of the space of the clearance hole 212, reduce the distance between two adjacent ceramic heaters 10, and improve the space utilization rate of the clearance hole 212, which is beneficial to improving the heating area and the uniformity of heating. Moreover, since the support plate 214 and the fixed support plate 32 are detachably fixed to the base plate 211 and the positioning post 31, the damaged ceramic heater 10 can be removed simply by removing the support plate 214 and the fixed support plate 32 during maintenance, thus making subsequent maintenance more convenient.

[0066] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A mounting structure for a ceramic heater, the ceramic heater comprising a body, a ceramic mounting base disposed on one side of the body, and a heating surface disposed on the other side of the body, characterized in that: The mounting structure for the ceramic heater includes a support assembly for supporting the ceramic heater and a positioning and fixing assembly connected to the support assembly for positioning and fixing the ceramic heater. The support assembly includes a support component for supporting the ceramic heater and a partition assembly disposed on the support component for separating multiple ceramic heaters. The support component includes a base plate, a clearance hole formed on the base plate for placing the ceramic heater, and multiple support plates detachably connected to the base plate for supporting the ceramic heater. The partition assembly includes a first partition strip and multiple second partition strips connected to the first partition strip and spaced apart. The first dividing strip includes multiple first base plates, multiple first baffles, and multiple insertion holes formed on the first base plates. Each second dividing strip also includes a second base plate, a second clearance portion located at one end of the second base plate, a barbed protrusion located at the other end of the second base plate, and at least one second positioning protrusion located on the second base plate. The positioning and fixing assembly includes a positioning post and a fixed support plate connected to the positioning post. The positioning post passes through the insertion holes. The multiple first baffles and multiple second baffles evenly divide the clearance holes into multiple small accommodating frames for placing the ceramic heater to improve the space utilization of the clearance holes. The fixed support plate and the support plate are used to support the ceramic heater.

2. The mounting structure for a ceramic heater as described in claim 1, characterized in that: The mounting structure for the ceramic heater also includes a plurality of elastic abutment members disposed between the ceramic heater and the support assembly. Each elastic abutment member includes an elastic spring and two elastic mounting holes disposed on the elastic spring.

3. The mounting structure for a ceramic heater as described in claim 1, characterized in that: The support assembly further includes a top cover connected to the bearing assembly. The partition assembly is welded and fixed to the top cover. The top cover includes a top plate, a plurality of through holes disposed on the top plate for the ceramic fixing seat to pass through, a plurality of positioning grooves disposed on the top plate, a plurality of mounting holes disposed on the top plate, a plurality of bending edges perpendicularly disposed on the edge of the top plate, and a plurality of mounting edges connected to the bending edges and parallel to the top plate.

4. The mounting structure for a ceramic heater as described in claim 1, characterized in that: The supporting component also includes a plurality of blocking edges formed on the base plate and located around the clearance hole, the blocking edges being vertically arranged on the base plate and surrounding the clearance hole.

5. The mounting structure for a ceramic heater as described in claim 4, characterized in that: The first dividing strip also includes two first clearance portions located on both sides of the first base plate and avoiding the blocking edge, two positioning grooves located on opposite sides of each of the plug holes, and at least two first positioning protrusions located on the first base plate.

6. The mounting structure for a ceramic heater as described in claim 5, characterized in that: The second partition bars are equally spaced on the same side of the first partition bar. The barbed protrusions are used to cooperate with the positioning grooves to quickly assemble and position the first partition bar and the second partition bar. The second clearance portion is used to avoid the blocking edge.

7. The mounting structure for a ceramic heater as described in claim 1, characterized in that: Each of the positioning and fixing components also includes a fastener for securing the fixing support plate to the positioning post.

8. The mounting structure for a ceramic heater as described in claim 7, characterized in that: The positioning post includes a positioning post body inserted into the insertion hole, a positioning protrusion located on the positioning post body and facing one end of the top plate, and two positioning plugs located at the other end of the positioning post body. The positioning protrusion has a disc-shaped structure with a notch, which is adapted to the size and shape of the mounting hole.

9. The mounting structure for a ceramic heater as described in claim 8, characterized in that: The positioning plugs are located on both sides of the threaded hole and are used to insert into the fixed support plate. The size and shape of the positioning plugs and the insertion holes on the fixed support plate are adapted to each other. The positioning plugs are arched structures.

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