Drilling equipment for precise metal parts

Abstract

The invention relates to the technical field of machining equipment, in particular to drilling equipment for precise metal parts. The precise metal part punching device comprises a base, a clamp assembly for clamping a precise metal part, a punching assembly for punching the metal part, an adjusting assembly for adjusting the punching position and a cooling assembly for cooling the punching position. The punching assembly comprises a drill bit, a main shaft connected with the drill bit and a servo motor driving the main shaft to rotate. A liquid inlet through hole is formed in the handle portion of the drill bit, a liquid outlet through hole is formed in the cutting portion of the drill bit, and a cooling liquid channel communicated with the liquid inlet through hole and the liquid outlet through hole is formed in the drill bit. The cooling assembly cools the interior of the drill bit, cools the external punching area at the same time, and synchronously cleans and shields the inner wall of the extrusion part.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing equipment, and in particular to a drilling device for precision metal parts. Background Art

[0002] Precision metal parts are widely used in modern industry, including but not limited to aerospace, automobile manufacturing, electronic equipment, medical equipment, communication equipment and other fields. In these applications, the processing quality and accuracy of precision metal parts directly affect the performance and reliability of the products; the large amount of metal chips generated during the drilling process, if not handled properly, will cause scratches on the processed surface, reduce the accuracy of the hole wall, and even damage the tool; and the high temperature during the drilling process will cause increased tool wear, deformation of the workpiece, and reduced surface quality.

[0003] The invention with application number CN202210080364.X relates to an efficient diamond drill bit capable of rapid cooling, comprising a mounting seat, a connecting groove provided in the mounting seat, a clamping mechanism provided in the connecting groove and clamped to a drill rod, a drill bit provided at the bottom of the drill rod, and a chip removal mechanism provided on the outer surface of the drill bit; a cooling mechanism is provided on the drill rod, and the cooling mechanism is used to cool the drill bit; the present invention is arranged on a drilling device through a mounting seat, and when it is necessary to drill a hole in glass, a drill bit of suitable specifications is first selected, wherein the drill bit and the drill rod are fixedly connected, and then the top of the drill rod is clamped and fixed to the connecting groove, and by adopting a clamping method, drill bits of different specifications can be conveniently replaced, so that the practicality of the invention is higher, and the chip removal mechanism provided on the outer surface of the drill bit can discharge glass waste from the chip removal groove when the diamond drill bit is drilling a hole, so that the drill bit can drill the hole more smoothly.

[0004] However, the debris generated during the drilling process of the patent will escape outwards. Although the fly ash in the air is settled, the debris cannot be collected in a centralized manner.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0006] The purpose of the present invention is to provide a drilling device for precision metal parts which can effectively solve the above technical problems.

[0007] In order to achieve the purpose of the present invention, the following technical scheme is adopted:

[0008] A drilling device for precision metal parts, comprising: a base, a fixture assembly for clamping the precision metal parts, a punching assembly for punching holes in the metal parts, an adjustment assembly for adjusting the punching position, and a cooling assembly for cooling the punching position;

[0009] The drilling assembly comprises: a drill bit, a spindle connected to the drill bit, and a servo motor driving the spindle to rotate; a liquid inlet through hole is provided on the shank of the drill bit, a liquid outlet through hole is provided on the cutting portion of the drill bit, and a coolant channel connecting the liquid inlet through hole and the liquid outlet through hole is provided inside the drill bit;

[0010] The cooling component comprises: a cooling liquid nozzle and a liquid supply unit for supplying liquid to the cooling liquid nozzle;

[0011] A shielding extrusion member for shielding debris and coolant, and a cleaning component for cleaning the shielding extrusion member;

[0012] When the punching assembly punches holes, the coolant nozzle supplies liquid to the liquid inlet through hole of the drill bit and sprays liquid to the shielding extrusion member.

[0013] Furthermore, the coolant nozzle has a water outlet hole for spraying water toward the liquid inlet hole and the outside of the drill bit.

[0014] Further, the shielding extrusion member is installed on the periphery of the main shaft;

[0015] The shielding extrusion member is composed of an upper cover body, a lower cover body slidably mounted on the upper cover body, and a spring connecting the upper cover body and the lower cover body.

[0016] Furthermore, the cleaning assembly includes: a cleaning member, a connecting rod connected to the top of the cleaning member; the connecting rod is connected to the main shaft;

[0017] The cleaning member comprises: a supporting portion connected to the connecting rod, an arc-shaped cleaning portion hinged to the supporting portion, a storage portion installed at the bottom of the arc-shaped cleaning portion, and a buffer portion connected to the storage portion.

[0018] Furthermore, the storage portion is composed of an outer arc arranged on the outside and an inner arc arranged on the inner wall of the outer arc; the inner arc is convex inwardly;

[0019] When the main shaft rotates at a high speed, a plurality of the outer arcs are connected in sequence to form a ring, and a plurality of the inner arcs are connected in sequence to form a corrugated annular ring.

[0020] Furthermore, the adjustment assembly includes: a lifting assembly that drives the punching assembly to move up and down as a whole, a moving assembly that drives the lifting assembly to move horizontally, and a mounting frame for mounting the moving assembly.

[0021] Further, the lifting assembly includes: a slide seat slidably mounted on one side of the top of the mounting frame, a first motor mounted on the top of the slide seat, and a first screw rod coaxially connected to the output end of the first motor;

[0022] A sliding groove is longitudinally provided on the side wall of the slide seat, and a sliding block is slidably installed in the sliding groove; the sliding block is threadedly connected to the first screw rod; a motor mounting seat is fixedly installed on the sliding block, and the motor mounting seat is connected to the servo motor.

[0023] Furthermore, the moving assembly includes: a support base fixedly installed laterally on the top of the mounting frame, a second motor installed on the support base, and a second screw rod coaxially connected to the output end of the second motor; the second screw rod is threadedly connected to the sliding seat.

[0024] Further, the clamp assembly includes: a fixing plate, a clamping plate for clamping the metal part, and a third motor for driving the clamping plate to clamp the metal part;

[0025] The output end of the third motor is coaxially connected to a driving gear, the driving gear is meshed with a first chain, the first chain is meshed with a first driven gear; the driving gear is also meshed with a second chain, the second chain is meshed with a second driven gear; the first driven gear and the second driven gear are coaxially connected to threaded rods respectively; the threaded rods are respectively threadedly connected to both ends of the fixing plate.

[0026] Compared with the prior art, the present invention has the following beneficial effects: the cooling component of the present application cools the inside of the drill bit while cooling the external drilling area at the same time, and simultaneously cleans the inner wall of the shielding extrusion part. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the axial side of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the adjustment assembly of the present invention;

[0031] Figure 4 for Figure 3 A partial enlarged view of part A;

[0032] Figure 5 for Figure 3 A partial enlarged view of part B;

[0033] Figure 6 It is a structural schematic diagram of the clamp assembly of the present invention;

[0034] Figure 7 For the present invention Figure 6A partial enlarged view of part C in the middle;

[0035] Figure 8 It is a structural schematic diagram of the lifting assembly of the present invention;

[0036] Fig. 9 A top view of the cleaning element of the present invention;

[0037] Fig.10 A schematic diagram of the internal structure of the cleaning assembly and the drill bit of the present invention;

[0038] Fig.11 This is a schematic diagram of the internal structure of the shielding extrusion member of the present invention;

[0039] Fig.12 for Fig.11 A partial enlarged view of part D.

[0040] In the figure: 1, base; 2, fixture assembly; 3, punching assembly; 4, adjustment assembly; 5, cooling assembly; 31, drill bit; 32, servo motor; 41, lifting assembly; 42, moving assembly; 43, mounting frame; 411, slide seat; 412, first motor; 413, first screw; 414, slider; 415, motor mounting seat; 421, support seat; 422, second motor; 423, second screw; 51, coolant tank; 52, circulation pump; 53, coolant nozzle; 311, liquid inlet hole; 312, liquid outlet hole; 313, coolant channel; 34 , shielding extrusion member; 33, cleaning assembly; 331, cleaning member; 332, connecting rod; 3311, supporting part; 3312, arc-shaped cleaning part; 3313, storage part; 3314, buffer part; 33131, outer arc; 33132, inner arc; 331321, annular ring; 21, fixing plate; 22, clamping plate; 23, third motor; 24, driving gear; 25, first chain; 26, first driven gear; 27, second chain; 28, second driven gear; 29, threaded rod; 341, upper cover body; 342, lower cover body; 343, spring. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0042] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] like Figures 1 to 12 As shown, the present invention is a drilling device for precision metal parts, comprising: a base 1; a clamp assembly 2 for clamping the precision metal parts, a punching assembly 3 for punching holes in the metal parts, an adjustment assembly 4 for adjusting the punching position, and a cooling assembly 5 for cooling the punching position; a visual inspection camera for detecting the drilling status is installed on the base 1.

[0044] The punching assembly 3 includes: a main shaft, a drill bit 31 connected to the main shaft, and a servo motor 32 for driving the main shaft to rotate. The servo motor 32 is connected to the main shaft through a coupling; the servo motor 32 drives the drill bit 31 to punch holes.

[0045] The adjustment assembly 4 includes: a lifting assembly 41 that drives the punching assembly 3 to move up and down as a whole, a moving assembly 42 that drives the lifting assembly 41 to move horizontally, and a mounting frame 43 for mounting the moving assembly 42. In this embodiment, the horizontal direction refers to a direction perpendicular to the conveying direction in a horizontal plane, that is, parallel to the length direction of the mounting frame 43.

[0046] The lifting assembly 41 includes: a slide seat 411 slidably mounted on one side of the top of the mounting frame 43, a first motor 412 mounted on the top of the slide seat 411, an output end of the first motor 412 coaxially connected to a first screw rod 413, a side wall of the slide seat 411 having a slide groove longitudinally provided, a slider 414 slidably mounted in the slide groove, and the slider 414 is threadedly connected to the first screw rod 413; a motor mounting seat 415 is fixedly mounted on the slider 414, and the motor mounting seat 415 is used to carry the punching assembly 3.

[0047] The moving assembly 42 includes: a support base 421 fixedly installed horizontally on the top of the mounting frame 43, a second motor 422 installed on the support base 421, a second screw 423 coaxially connected to the output end of the second motor 422, and the second screw 423 is threadedly connected to the slide seat 411, which is used to drive the sliding horizontal movement through the second motor 422.

[0048] The punching assembly 3 is lifted and lowered by the lifting assembly 41, and is moved laterally by the moving assembly 42, thereby driving the punching assembly 3 to move laterally, so that the up and down position and the lateral position of the drill bit 31 can be adjusted, and the punching position can be adjusted as needed.

[0049] The cooling component 5 includes: a liquid supply unit, which consists of a coolant tank 51 installed on the top of the mounting frame 43, a circulating pump 52 connected to the coolant tank 51, and a cooling pipeline and a return pipe connected to the circulating pump 52; the water outlet end of the cooling pipeline is connected to a coolant nozzle 53; the liquid outlet end of the coolant nozzle 53 is connected to the shank of the drill bit 31; the shank of the drill bit 31 is provided with a liquid inlet hole 311, and the cutting part of the drill bit 31 is provided with a liquid outlet hole 312, and a coolant channel 313 connecting the liquid inlet hole 311 and the liquid outlet hole 312 is provided therein; a shielding extrusion member 34 for shielding debris and coolant, and a cleaning component 33 for cleaning the shielding extrusion member 34.

[0050] The coolant nozzle 53 has a central water outlet hole and annular water outlet holes installed along the circumference, which are used to spray coolant to the liquid inlet hole 311 of the shank of the drill bit 31 and the outer wall of the drill bit 31, respectively, to cool the inside and outside of the drill bit 31; the coolant is sprayed out from the liquid outlet hole 312 of the cutting part of the drill bit 31, so as to cool the drill bit 31 and metal parts, and wash away the debris at the drilling position; at the same time, the rotation of the drill bit 31 will also cause the water on the outer surface of the drill bit 31 to splash onto the inner wall; the opening of the annular water outlet hole faces downward and is inclined toward the direction of the drill bit 31, so as to cool the drilling position from the outside.

[0051] A shielding extrusion piece 34 is also installed on the main shaft. The shielding extrusion piece 34 is located on the periphery of the drill bit 31 and is in the shape of a hollow cylinder. The shielding extrusion piece 34 consists of an upper cover body 341, a lower cover body 342 slidably installed on the upper cover body 341, and a spring 343 connecting the upper cover body 341 and the lower cover body 342; the lower cover body 342 is preferably made of a transparent material; when the lifting assembly 41 drives the drill bit 31 to move downward, the lower cover body 342 contacts the upper surface of the metal part and preliminarily fixes the metal part; at the same time, the lower cover body 342 and the upper cover body 341 enclose the drill bit 31 therein, which can prevent metal debris generated when the drill bit 31 drills a hole from splashing to the outside; the setting of the spring 343 allows a buffer space in the vertical direction to exist between the upper cover body 341 and the lower cover body 342, so as to avoid damage to the lower cover body 342 or the upper cover body 341 due to downward pressure; the spring 343 is preferably a spring with strong elastic force.

[0052] A cleaning assembly 33 for cleaning the shielding extrusion member 34 is also installed on the main shaft; the cleaning assembly 33 includes: a cleaning member 331, a connecting rod 332 connected to the top of the cleaning member 331, and the connecting rod 332 is connected to the main shaft; the connecting rod 332 is in a 7 shape, and the top end of the connecting rod 332 is connected to the main shaft, and its bottom end is connected to the cleaning member 331.

[0053] The cleaning member 331 comprises: a supporting portion 3311 connected to the bottom end of the connecting rod 332, an arc-shaped cleaning portion 3312 hinged to the supporting portion 3311, a storage portion 3313 installed at the bottom of the arc-shaped cleaning portion 3312, and a buffer portion 3314 connected to the storage portion 3313; the supporting portion 3311 is used to support and install the arc-shaped cleaning portion 3312, the hinge axis of the arc-shaped cleaning portion 3312 is located at the end away from the storage portion 3313, when the arc-shaped cleaning portion 3312 rotates with the main shaft, under the action of centrifugal force, the bottom end of the arc-shaped cleaning portion 3312 swings outward and contacts with the inner wall of the lower cover body 342, so that it can rotate. During the rotation, the inner wall of the lower cover body 342 is cleaned; the arc-shaped design of the arc-shaped cleaning portion 3312 allows, during the rotation, on the one hand, the debris on the inner wall of the lower cover body 342 to be cleaned, and on the other hand, the debris in contact with the arc-shaped cleaning portion 3312 can be brought to the bottom of the lower cover body 342. At the same time, after the arc-shaped cleaning portion 3312 cleans the debris on the inner wall of the lower cover body 342, the influence of impurities on the recognition effect of the visual camera can be reduced; the storage portion 3313 is used to accumulate debris that falls on the workbench surface; the buffer portion 3314 is used to allow the storage portion 3313 to have a certain shrinkage space when the storage portion 3313 is subjected to pressure.

[0054] When drilling, the coolant is sprayed from the liquid inlet hole 311 of the shank of the drill bit 31 to the inside of the drill bit 31, thereby cooling the inside of the drill bit 31 and protecting the drill bit 31; at the same time, the coolant is sprayed from the liquid outlet hole 312 of the drill bit 31 to wash away the debris at the drilling position; the coolant is also sprayed from the outside of the drill bit 31 to the drilling area, thereby cooling the outside of the drill bit 31, further reducing the temperature and preventing the drill bit 31 from overheating; at the same time, the sprayed coolant flushes the inner wall of the shielding extrusion member 34, and washes the debris attached to the inner wall of the shielding extrusion member 34 to the bottom of the shielding extrusion member 34.

[0055] Preferably, the storage portion 3313 is composed of an outer arc 33131 arranged on the outside and an inner arc 33132 arranged on the inner wall of the outer arc 33131; when the main shaft rotates at high speed, the outer arcs 33131 of the storage portions 3313 of the multiple shielding extrusion members 34 are connected in sequence to form a ring, and the inner arcs 33132 are connected in sequence to form a corrugated annular ring 331321, and the debris and coolant are gathered into the annular range by the outer arc 33131, so as to achieve local concentration of the coolant, more effectively absorb and take away the heat in the area, thereby improving the overall cooling efficiency of the inner arc 33132; the flow of coolant in the annular ring 331321 will form a certain scouring force, which helps to wash away impurities such as debris and dirt attached to the surface of the component; at the same time, the inner arc 33132 drives the water flow, and during the flow, the debris is accumulated on the surface of the annular ring 331321 to prevent the debris from interfering with the drilling.

[0056] Preferably, a magnetic part is installed inside the inner arc 33132; the magnetic part is a magnet or an electromagnet; when an electromagnet is used, the electromagnet is energized when drilling, and the electromagnet is de-energized when drilling stops, so that the debris generated during drilling is attracted by the electromagnet to prevent the debris from falling into the hole.

[0057] When drilling, the spindle rotates, driving the drill bit 31 to drill while driving the shielding and extruding member 34 to swing, so that the shielding and extruding member 34 can prevent the debris generated by drilling from splashing and gather the collected debris in the annular ring 331321. At the same time, the cooling component 5 performs dual cooling on the inside of the drill bit 31 and the outside of the hole; the external coolant flows through the shielding and extruding member 34, flushing away the debris attached to the inner wall of the shielding and extruding member 34, keeping the shielding and extruding member 34 clean, and ensuring that the shielding and extruding member 34 can be used for a long time; when drilling a through hole, when the through hole is penetrated, the drill bit 31 stops rotating, and the coolant accumulated in the storage part 3313 flows out of the through hole, driving the accumulated debris to flow out of the through hole at the same time.

[0058] Preferably, a mounting groove is provided on the side wall of the support portion 3311, a spring is installed in the mounting groove, and the other end of the spring is connected to a position near the bottom of the arc-shaped cleaning portion 3312; when the main shaft does not rotate, the bottom of the arc-shaped cleaning portion 3312 is kept away from the main shaft.

[0059] The clamp assembly 2 includes: a fixed plate 21, a clamping plate 22 for clamping metal parts, and a third motor 23 for driving the clamping plate 22 to clamp the metal parts; the output end of the third motor 23 is coaxially connected with a driving gear 24, the driving gear 24 is meshed with a first chain 25, and the first chain 25 is meshed with a first driven gear 26; the driving gear 24 is a double gear, the driving gear 24 is also meshed with a second chain 27, and the second chain 27 is meshed with a second driven gear 28; the first driven gear 26 and the second driven gear 28 are coaxially connected with a threaded rod 29, respectively, and the threaded rod 29 is respectively threadedly connected to the two ends of the fixed plate 21; it is used to drive the fixed plate 21 to clamp metal parts.

[0060] How the visual inspection camera specifically detects does not fall within the scope of protection of the present invention. The methods of application numbers CN115401247A and CN113799195A may be used for visual inspection.

[0061] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0062] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A drilling device for precision metal parts, characterized in that: include: Base, fixture assembly for clamping precision metal parts, punching assembly for punching holes in metal parts, adjustment assembly for adjusting the punching position, cooling assembly for cooling the punching position; The drilling assembly comprises: a drill bit, a spindle connected to the drill bit, and a servo motor driving the spindle to rotate; a liquid inlet through hole is provided on the shank of the drill bit, a liquid outlet through hole is provided on the cutting portion of the drill bit, and a coolant channel connecting the liquid inlet through hole and the liquid outlet through hole is provided inside the drill bit; The cooling component comprises: a cooling liquid nozzle and a liquid supply unit for supplying liquid to the cooling liquid nozzle; A shielding extrusion member for shielding debris and coolant, and a cleaning component for cleaning the shielding extrusion member; When the punching assembly punches holes, the coolant nozzle supplies liquid to the liquid inlet through hole of the drill bit and sprays liquid to the shielding extrusion member.

2. A precision metal parts drilling device as claimed in claim 1, characterized in that: The cooling liquid nozzle has a water outlet hole for spraying water toward the liquid inlet through hole and the outside of the drill bit.

3. The drilling equipment for precision metal parts according to claim 1, characterized in that: The shielding extrusion member is mounted on the periphery of the main shaft; The shielding extrusion member is composed of an upper cover body, a lower cover body slidably mounted on the upper cover body, and a spring connecting the upper cover body and the lower cover body.

4. A drilling device for precision metal parts as claimed in claim 3, characterized in that: The cleaning assembly comprises: a cleaning member, and a connecting rod connected to the top of the cleaning member; the connecting rod is connected to the main shaft; The cleaning member comprises: a supporting portion connected to the connecting rod, an arc-shaped cleaning portion hinged to the supporting portion, a storage portion installed at the bottom of the arc-shaped cleaning portion, and a buffer portion connected to the storage portion.

5. A drilling device for precision metal parts as claimed in claim 4, characterized in that: The storage part is composed of an outer arc arranged on the outside and an inner arc arranged on the inner wall of the outer arc; The inner arc is convex inwardly; When the main shaft rotates at a high speed, a plurality of the outer arcs are connected in sequence to form a ring, and a plurality of the inner arcs are connected in sequence to form a corrugated annular ring.

6. The drilling equipment for precision metal parts according to claim 1, characterized in that: The adjustment component includes: a lifting component that drives the punching component to move up and down as a whole, a moving component that drives the lifting component to move horizontally, and a mounting frame for mounting the moving component.

7. A drilling device for precision metal parts as claimed in claim 6, characterized in that: The lifting assembly comprises: a slide seat slidably mounted on one side of the top of the mounting frame, a first motor mounted on the top of the slide seat, and a first screw rod coaxially connected to the output end of the first motor; A sliding groove is longitudinally provided on the side wall of the slide seat, and a sliding block is slidably installed in the sliding groove; the sliding block is threadedly connected to the first screw rod; a motor mounting seat is fixedly installed on the sliding block, and the motor mounting seat is connected to the servo motor.

8. The drilling equipment for precision metal parts as claimed in claim 7, characterized in that: The moving assembly includes: a support base fixedly installed horizontally on the top of the mounting frame, a second motor installed on the support base, and a second screw rod coaxially connected to the output end of the second motor; the second screw rod is threadedly connected to the sliding seat.

9. The drilling equipment for precision metal parts according to claim 1, characterized in that: The clamp assembly comprises: a fixing plate, a clamping plate for clamping the metal part, and a third motor for driving the clamping plate to clamp the metal part; The output end of the third motor is coaxially connected to a driving gear, the driving gear is meshed with a first chain, the first chain is meshed with a first driven gear; the driving gear is also meshed with a second chain, the second chain is meshed with a second driven gear; the first driven gear and the second driven gear are coaxially connected to threaded rods respectively; the threaded rods are respectively threadedly connected to both ends of the fixing plate.

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