CN113928743B - Resonance type raw coal bucket vibration beating mechanism applied to thermal power coal supply system - Google Patents

Abstract

The invention provides a resonant type raw coal scuttle shaking and beating mechanism applied to a thermal power coal supply system, which comprises a coal scuttle main body, wherein an expansion joint is fixed at the bottom end of the coal scuttle main body, a pneumatic inserting plate door is fixed at the bottom end of the expansion joint, a first shaking and beating device is arranged at the top end of the pneumatic inserting plate door, a variable-diameter coal scuttle is arranged at the bottom end of the pneumatic inserting plate door, and a second shaking and beating device is arranged outside the variable-diameter coal scuttle; the first jolting device is located including the cover the outside buffering subassembly of expansion joint, and is fixed in the support frame on buffering subassembly top, the inside top of support frame is fixed with a plurality of pre-vibrating elements, inside bottom mounting have a plurality of first vibration air hammers, and is a plurality of first vibration air hammers encircle the axis setting of expansion joint. The invention can knock different ends of the raw coal hopper in various ways to improve the vibration dredging capability.

Description

Resonance type raw coal bucket vibration beating mechanism applied to thermal power coal supply system

Technical Field

The invention mainly relates to the technical field of coal conveying of thermal power plants, in particular to a resonant type raw coal bucket vibrating and beating mechanism applied to a thermal power coal supply system.

Background

The raw coal hopper is a part of a boiler system of a thermal power plant, and the conveying relationship of the raw coal in the boiler system of the thermal power plant is stable combustion of the boiler.

According to the patent document with the application number of CN201310489839.1, the coal bunker comprises a raw coal bunker main body, a variable diameter coal bunker which is asymmetrically arranged and two small rotating coal bunkers; the variable-diameter coal hopper is provided with a coal inlet and two coal outlets, the coal inlet of the variable-diameter coal hopper corresponds to the coal drop port of the raw coal hopper main body in shape and is in sealed connection, the two coal outlets of the variable-diameter coal hopper are independently arranged in parallel, and each coal outlet corresponds to the coal inlet of a small rotating coal hopper in shape and is in sealed connection; the rotary small coal hopper is of a cylindrical structure. The raw coal hopper can ensure that the raw coal is kept smooth in the process of conveying the raw coal from the raw coal hopper to the coal feeder, effectively solves the problems of unsmooth coal falling and easy blockage of the raw coal caused by the defects of the structure of the raw coal hopper in the conveying process, prevents coal blockage to the maximum extent, lightens the working strength of field operation personnel, and is favorable for safe and stable operation of a unit.

However, the above-mentioned raw coal hopper still has drawbacks, for example, the above-mentioned raw coal hopper influences the uplift force of the coal breakage by outputting high-pressure wind to prevent the occurrence of coal blockage, but the conventional raw coal hopper often uses manual work or a single vibration air hammer to strike the raw coal hopper, which causes the phenomena of coal blockage, coal shed and coal breakage at the insertion plate of the coal feeder in the raw coal hopper, and especially causes the coal feeding interruption of the coal feeder due to frequent occurrence of coal blockage when the temperature is low in winter.

Disclosure of Invention

The invention mainly provides a resonant type raw coal scuttle shaking mechanism applied to a thermal power coal supply system, which is used for solving the technical problems in the background technology.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a resonance type raw coal scuttle shaking and beating mechanism applied to a thermal power coal supply system comprises a coal scuttle main body, wherein an expansion joint is fixed at the bottom end of the coal scuttle main body, a pneumatic inserting plate door is fixed at the bottom end of the expansion joint, a first shaking and beating device positioned outside the expansion joint is arranged at the top end of the pneumatic inserting plate door, a variable-diameter coal scuttle is arranged at the bottom end of the pneumatic inserting plate door, and a second shaking and beating device is arranged outside the variable-diameter coal scuttle;

the first vibration device comprises a buffering component sleeved outside the expansion joint and a supporting frame fixed at the top end of the buffering component, a plurality of pre-vibration elements are fixed at the top end of the interior of the supporting frame, a plurality of first vibration air hammers are fixed at the bottom end of the interior of the supporting frame, and the first vibration air hammers are arranged around the central axis of the expansion joint;

the pre-vibration element comprises cylinders which are fixed inside the support frame and symmetrically arranged, swinging rods which are connected with the piston rods of the cylinders in a rotating mode through rotating shafts, and crank rotating shafts which sequentially penetrate through the swinging rods, wherein a plurality of striking hammers are fixed on the outer surfaces of the crank rotating shafts and are abutted to the struck devices, and the struck devices are fixed on the outer surfaces of the coal hopper main bodies.

Furthermore, the buffering subassembly is including being fixed in the hammering hammer of pneumatic picture peg door upper surface is fixed in a plurality of telescopic links of supporting disk upper surface to and the cover is located the outside spring of telescopic link, the top of telescopic link is worn to locate the bottom of support frame, through the flexible of telescopic link to balanced support frame self produced vibration, here simultaneously, through the energy storage of spring, in order further to provide the buffer capacity for the support frame.

Furthermore, first rapping device still include with the lifting component that the pre-vibrating element is connected, the lifting component include through the bearing frame with the piston rod of cylinder rotates the first connecting rod of connecting, and through the pivot with the second connecting rod that the one end of the piston rod of cylinder was kept away from to first connecting rod rotated the connection, the one end that first connecting rod was kept away from to the second connecting rod through the bearing frame with the upper surface of pneumatic picture peg door is connected, through first connecting rod and second connecting rod after vertical, and jack-up and cylinder and its upper bracket.

Furthermore, the crank rotating shaft comprises two U-shaped shaft bodies which are rotatably connected with the supporting frame through rotating shafts, and a linear shaft body which is fixed between the two U-shaped shaft bodies, the U-shaped shaft bodies penetrate through the swinging rod, and the linear shaft body is fixed between the two U-shaped shaft bodies, so that the linear shaft bodies are driven to rotate.

Furthermore, the striking hammer is including wearing to locate a plurality of first hammer handles that sharp axis body and equidistance set up, and through the pivot with the second hammer handle of connection is rotated to the one end that the sharp axis body was kept away from to first hammer handle, the one end that first hammer handle was kept away from to the second hammer handle is fixed with the tup, strikes the ware of being struck and produces the vibration through the tup on the second hammer handle.

Furthermore, the striker comprises a striker frame fixed on the outer surface of the coal hopper main body and a first striker head fixed on the upper surface of the striker frame and used for the hammer head to strike, and the striker frame receives vibration generated when the first striker head strikes and transmits the vibration to the coal hopper main body connected with the striker frame so as to dredge the coal hopper main body.

Furthermore, the second jarring device is including wearing to locate the brace table of reducing coal scuttle surface, and be fixed in a plurality of second vibration air hammers of brace table upper surface, it is a plurality of the second vibration air hammer encircles the axis setting of reducing coal scuttle strikes the reducing coal scuttle of pneumatic picture peg door bottom through the second vibration air hammer to mediation reducing coal scuttle and pneumatic picture peg door.

Further, the support frame is including being fixed in a plurality of the first bearing ring of telescopic link upper surface is fixed in the support column of first bearing ring upper surface to and be fixed in a plurality of the second bearing ring of support column upper surface provides the support for first vibration air hammer and cylinder through first bearing ring, provides the support for the crank rotation axis through second bearing ring.

Furthermore, first bearing ring is fixed in the lower surface of first vibration air hammer and cylinder, the inner ring surface of first bearing ring is fixed with a plurality of resonance hammers, and the support frame is through the collision between resonance hammer and the pneumatic picture peg door on it to the vibrational force that produces the transmission to the pneumatic picture peg door.

Furthermore, a plurality of second driven heads for the resonance hammer to knock are fixed on the upper surface of the pneumatic inserting plate door, and the second driven heads bear the knocking of the resonance hammer.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the invention can knock different ends of the raw coal hopper in various ways to improve the vibration dredging capability, and specifically comprises the following steps: drive the striking hammer through the crank rotation axis and rotate, with the help of gravity and fall fast to strike the tup in the hammer and strike the ware and produce the vibration, strike the ware and give the coal scuttle main part with the vibrational force, in order to dredge in advance, then through the first vibration air hammer striking expansion joint in the support frame, in order further to dredge, through the second vibration air hammer striking reducing coal scuttle in the second jarring device, dredge once more.

Secondly, the invention adopts various angles to knock the raw coal hopper to realize the vibration dredging capability, and specifically comprises the following steps: the first connecting rod is driven to carry out angular displacement through the extension of the piston rod of the air cylinder, the second connecting rod which is rotatably connected with the first connecting rod is driven to carry out angular displacement through the first connecting rod, the support frame falls down again when the first connecting rod and the second connecting rod which are vertical are jacked up and the air cylinder and the support frame are arranged on the air cylinder, and the support frame collides with the pneumatic plugboard door through the resonance hammer on the support frame so as to generate the vibration force which is transmitted to the pneumatic plugboard door.

The present invention will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a first exploded view of the present invention;

FIG. 4 is a second exploded view of the present invention;

FIG. 5 is an isometric view of the present invention;

FIG. 6 is a cross-sectional view of the present invention;

FIG. 7 is a schematic structural view of the present invention;

fig. 8 is a schematic structural diagram of the present invention.

In the figure: 10. a coal hopper main body; 20. an expansion joint; 30. a pneumatic gate; 31. a second struck head; 40. a first jarring device; 41. a buffer assembly; 411. a support disc; 412. a telescopic rod; 413. a spring; 42. a support frame; 421. a first pressure-bearing ring; 422. a support pillar; 423. a second pressure-bearing ring; 424. a resonant hammer; 43. a pre-vibration element; 431. a cylinder; 432. a swing lever; 433. a crank rotating shaft; 4331. a U-shaped shaft body; 4332. a linear shaft body; 434. striking a hammer; 4341. a first hammer handle; 4342. a second hammer handle; 4343. a hammer head; 44. a first vibrating air hammer; 45. a lifting element; 451. a first link; 452. a second link; 50. a variable diameter coal hopper; 60. a second jarring device; 61. a support table; 62. and a second vibrating air hammer.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In an embodiment, referring to fig. 1 to 8, a resonant type raw coal scuttle shaking mechanism applied to a thermal power coal supply system includes a coal scuttle main body 10, an expansion joint 20 is fixed at the bottom end of the coal scuttle main body 10, a pneumatic spile door 30 is fixed at the bottom end of the expansion joint 20, a first shaking device 40 located outside the expansion joint 20 is arranged at the top end of the pneumatic spile door 30, a diameter-variable coal scuttle 50 is arranged at the bottom end of the pneumatic spile door, and a second shaking device 60 is arranged outside the diameter-variable coal scuttle 50;

the first rapping device 40 comprises a buffering component 41 sleeved outside the expansion joint 20 and a supporting frame 42 fixed at the top end of the buffering component 41, wherein a plurality of pre-vibrating elements 43 are fixed at the top end of the supporting frame 42, a plurality of first vibrating air hammers 44 are fixed at the bottom end of the supporting frame 42, and the first vibrating air hammers 44 are arranged around the central axis of the expansion joint 20;

the pre-vibration element 43 comprises air cylinders 431 fixed inside the support frame 42 and symmetrically arranged, swing rods 432 rotatably connected with piston rods of the air cylinders 431 through rotating shafts, and crank rotating shafts 433 sequentially penetrating through the two swing rods 432, wherein a plurality of striking hammers 434 are fixed on the outer surfaces of the crank rotating shafts 433, the striking hammers 434 are abutted to an impactee 435, and the impactee 435 is fixed on the outer surface of the coal bucket main body 10;

in this embodiment, the oscillating rod 432 is pushed by the cylinder 431 to rotate up and down on the crank rotating shaft 433, the crank rotating shaft 433 on the supporting frame 42 converts the up-and-down rotation of the oscillating rod 432 into self circumferential rotation, the striking hammer 434 is driven to rotate by the crank rotating shaft 433 to rapidly fall by gravity, so that the hammer 4343 in the striking hammer 434 strikes the striker 435 to generate vibration, the striker 435 transmits the vibration force to the coal bucket main body 10 to perform pre-dredging, and then the expansion joint 20 is struck by the first vibration air hammer 44 in the supporting frame 42 to perform further dredging, and the second vibration air hammer 62 in the second rapping device 60 strikes the variable diameter coal bucket 50 to perform re-dredging.

Specifically, please refer to fig. 2 and 4 again, the buffering assembly 41 includes a striking hammer 411 fixed on the upper surface of the pneumatic patch door 30, a plurality of telescopic rods 412 fixed on the upper surface of the supporting plate 411, and a spring 413 sleeved outside the telescopic rods 412, a top end of the telescopic rods 412 penetrates through a bottom end of the supporting frame 42, the first rapping device 40 further includes a lifting element 45 connected to the pre-vibrating element 43, the lifting element 45 includes a first connecting rod 451 rotatably connected to a piston rod of the cylinder 431 through a bearing seat, and a second connecting rod 452 rotatably connected to an end of the first connecting rod 451 far away from the piston rod of the cylinder 431 through a rotating shaft, and an end of the second connecting rod 452 far away from the first connecting rod 451 is connected to the upper surface of the pneumatic patch door 30 through a bearing seat;

it should be noted that, in the present embodiment, when the supporting frame 42 generates vibration, the supporting frame 42 balances the vibration generated by the supporting frame 42 itself through the extension and contraction of the telescopic rod 412 at the bottom end thereof, and meanwhile, the energy is stored through the spring 413 to further provide the supporting frame 42 with a buffering capacity;

furthermore, the first connecting rod 451 is driven to perform angular displacement through the extension and contraction of the piston rod of the cylinder 431, the second connecting rod 452 rotatably connected to the first connecting rod 451 is driven to perform angular displacement through the first connecting rod 451, and the cylinder 431 and the upper supporting frame 42 thereof are jacked up through the first connecting rod 451 and the second connecting rod 452 after being erected.

Specifically, please refer to fig. 3, 7 and 8 again, the crank rotating shaft 433 includes two U-shaped shaft bodies 4331 rotatably connected to the supporting frame 42 through a rotating shaft, and a linear shaft body 4332 fixed between the two U-shaped shaft bodies 4331, the U-shaped shaft body 4331 penetrates through the swinging rod 432, the striking hammer 434 includes a plurality of first hammer handles 4341 penetrating through the linear shaft body 4332 and disposed at equal intervals, and a second hammer handle 4342 rotatably connected to an end of the first hammer handle 4341 away from the linear shaft body 4332 through a rotating shaft, an end of the second hammer handle 4342 away from the first hammer handle 4341 is fixed with a hammer head 4343, the striker 435 includes a striker frame 4351 fixed to an outer surface of the coal bunker body 10, and a first striker head 4352 fixed to an upper surface of the striker frame 4351 and used for the hammer head 4343 to strike;

it should be noted that, in the present embodiment, the U-shaped shaft bodies 4331 convert the up-and-down rotation motion of the swinging rod 432 into a circular rotation motion thereof, and since the linear shaft body 4332 is fixed between the two U-shaped shaft bodies 4331, the linear shaft body 4332 is driven to rotate;

further, the first hammer handle 4341 is driven to rotate by the rotating linear shaft 4332, and the second hammer handle 4342 is driven to rotate by the first hammer handle 4341 until the second hammer handle 4342 rapidly falls down by gravity, so as to generate vibration by knocking the striker 435 with the hammer head 4343 on the second hammer handle 4342;

further, the first struck head 4352 receives the strike of the falling hammer 4343, and the struck frame 4351 receives the vibration generated when the first struck head 4352 is struck, and transmits the vibration to the coal hopper body 10 connected thereto, thereby opening the coal hopper body 10.

Specifically, please refer to fig. 3, 7 and 8 again, the second rapping device 60 includes a supporting platform 61 penetrating through the outer surface of the reducing coal bunker 50, and a plurality of second vibrating air hammers 62 fixed on the upper surface of the supporting platform 61, the plurality of second vibrating air hammers 62 are arranged around the central axis of the reducing coal bunker 50, the supporting frame 42 includes a first pressure-bearing ring 421 fixed on the upper surface of the plurality of telescopic rods 412, a supporting column 422 fixed on the upper surface of the first pressure-bearing ring 421, and a second pressure-bearing ring 423 fixed on the upper surface of the plurality of supporting columns 422, the first pressure-bearing ring 421 is fixed on the lower surfaces of the first vibrating air hammer 44 and the cylinder 431, the inner ring surface of the first pressure-bearing ring 421 is fixed with a plurality of resonance hammers 424, and the upper surface of the pneumatic spile door 30 is fixed with a plurality of second driven heads 31 for the resonance hammers 424 to strike;

it should be noted that, in this embodiment, the variable diameter coal bunker 50 at the bottom end of the pneumatic spile door 30 is knocked by the second vibrating air hammer 62 to dredge the variable diameter coal bunker 50 and the pneumatic spile door 30;

further, the first vibration air hammer 44 and the cylinder 431 are supported by the first pressure bearing ring 421, and the crank rotation shaft 433 is supported by the second pressure bearing ring 423;

further, when the vertical first and second connecting rods 451 and 452 are lifted up and the cylinder 431 and the upper supporting frame 42 thereof are lifted up, and the supporting frame 42 falls down again, the supporting frame 42 generates a vibration force transmitted to the pneumatic slat door 30 through the expansion between the upper resonant hammer 424 and the pneumatic slat door 30;

further, the second struck head 31 receives the striking of the resonance hammer 424.

The specific operation mode of the invention is as follows:

when the raw coal hopper is dredged by using the rapping mechanism, a worker firstly pushes the swing rod 432 to vertically rotate on the crank rotating shaft 433 through the cylinder 431, the crank rotating shaft 433 on the supporting frame 42 converts the vertical rotation of the swing rod 432 into self circumferential rotation, the crank rotating shaft 433 drives the rapping hammer 434 to rotate, the rapping hammer 434 quickly falls down by virtue of gravity, so as to generate vibration by knocking the struck device 435 through the hammer head 4343 in the rapping hammer 434, the struck device 435 transmits the vibration force to the coal hopper main body 10 to carry out pre-dredging, and then the expansion joint 20 is impacted through the first vibration air hammer 44 in the supporting frame 42 to further carry out dredging, and the diameter-variable coal hopper 50 is impacted through the second vibration air hammer 62 in the second rapping device 60 to carry out dredging again;

the first connecting rod 451 is driven to perform angular displacement through the extension and contraction of the piston rod of the cylinder 431, the second connecting rod 452 rotatably connected to the first connecting rod 451 is driven to perform angular displacement through the first connecting rod 451, the supporting frame 42 falls down again when the cylinder 431 and the supporting frame 42 thereon are jacked up through the first connecting rod 451 and the second connecting rod 452 after being erected, and the supporting frame 42 generates vibration force transmitted to the pneumatic inserting plate door 30 through the collision between the resonant hammer 424 on the supporting frame 42 and the pneumatic inserting plate door 30.

The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above-described embodiments, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims (5)

1. A resonance type raw coal hopper shaking and hitting mechanism applied to a thermal power coal supply system comprises a coal hopper main body (10) and is characterized in that an expansion joint (20) is fixed at the bottom end of the coal hopper main body (10), a pneumatic inserting plate door (30) is fixed at the bottom end of the expansion joint (20), a first shaking and hitting device (40) located outside the expansion joint (20) is arranged at the top end of the pneumatic inserting plate door (30), a diameter-variable coal hopper (50) is arranged at the bottom end of the pneumatic inserting plate door, and a second shaking and hitting device (60) is arranged outside the diameter-variable coal hopper (50);

the first rapping device (40) comprises a buffering component (41) sleeved outside the expansion joint (20) and a supporting frame (42) fixed at the top end of the buffering component (41), wherein a plurality of pre-shaking elements (43) are fixed at the top end of the interior of the supporting frame (42), a plurality of first vibrating air hammers (44) are fixed at the bottom end of the interior of the supporting frame (42), and the first vibrating air hammers (44) are arranged around the central axis of the expansion joint (20);

the pre-vibration element (43) comprises cylinders (431) which are fixed inside the supporting frame (42) and symmetrically arranged, swinging rods (432) which are rotatably connected with piston rods of the cylinders (431) through rotating shafts, and crank rotating shafts (433) which sequentially penetrate through the two swinging rods (432), wherein a plurality of striking hammers (434) are fixed on the outer surfaces of the crank rotating shafts (433), the striking hammers (434) are abutted with a striker (435), and the striker (435) is fixed on the outer surface of the coal bucket main body (10);

the second rapping device (60) comprises a supporting table (61) which is arranged on the outer surface of the diameter-variable coal bunker (50) in a penetrating mode, and a plurality of second vibrating air hammers (62) which are fixed on the upper surface of the supporting table (61), wherein the second vibrating air hammers (62) are arranged around the central axis of the diameter-variable coal bunker (50);

the buffering assembly (41) comprises a supporting plate (411) fixed on the upper surface of the pneumatic inserting plate door (30), a plurality of telescopic rods (412) fixed on the upper surface of the supporting plate (411), and a spring (413) sleeved outside the telescopic rods (412), wherein the top end of each telescopic rod (412) penetrates through the bottom end of the supporting frame (42);

the supporting frame (42) comprises a first pressure bearing ring (421) fixed on the upper surfaces of the plurality of telescopic rods (412), a supporting column (422) fixed on the upper surface of the first pressure bearing ring (421), and a second pressure bearing ring (423) fixed on the upper surfaces of the plurality of supporting columns (422);

the first pressure bearing ring (421) is fixed on the lower surfaces of the first vibrating air hammer (44) and the cylinder (431), and a plurality of resonant hammers (424) are fixed on the inner ring surface of the first pressure bearing ring (421);

and a plurality of second struck heads (31) for the resonance hammers (424) to strike are fixed on the upper surface of the pneumatic flashboard door (30).

2. The resonant type raw coal bucket vibrating and striking mechanism applied to a thermal power and electric coal supply system is characterized in that the first vibrating and striking device (40) further comprises a lifting element (45) connected with the pre-vibrating element (43), the lifting element (45) comprises a first connecting rod (451) rotatably connected with a piston rod of the cylinder (431) through a bearing seat and a second connecting rod (452) rotatably connected with one end, far away from the piston rod of the cylinder (431), of the first connecting rod (451) through a rotating shaft, and one end, far away from the first connecting rod (451), of the second connecting rod (452) is connected with the upper surface of the pneumatic spile door (30) through the bearing seat.

3. The resonance type raw coal scuttle shaking mechanism applied to a thermal power coal supply system is characterized in that the crank rotating shaft (433) comprises two U-shaped shaft bodies (4331) which are rotatably connected with the supporting frame (42) through rotating shafts, and a linear shaft body (4332) which is fixed between the two U-shaped shaft bodies (4331), wherein the U-shaped shaft body (4331) penetrates through the swinging rod (432).

4. The resonant type raw coal scuttling mechanism applied to a thermal power and electric coal supply system is characterized in that the striking hammer (434) comprises a plurality of first hammer handles (4341) which are arranged through the linear shaft body (4332) at equal intervals, and a second hammer handle (4342) which is rotatably connected with one end, away from the linear shaft body (4332), of the first hammer handle (4341) through a rotating shaft, wherein a hammer head (4343) is fixed at one end, away from the first hammer handle (4341), of the second hammer handle (4342).

5. The resonant type raw coal scuttle shaking mechanism applied to a thermal power and electric coal supply system according to claim 4, wherein the striker (435) comprises a striker frame (4351) fixed on the outer surface of the coal scuttle body (10), and a first striker head (4352) fixed on the upper surface of the striker frame (4351) and used for the striker (4343) to strike.

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