CN112744729A

CN112744729A - Tower crane

Info

Publication number: CN112744729A
Application number: CN202110003156.5A
Authority: CN
Inventors: 柳雪娥
Original assignee: Guangzhou Jianggao Trading Co ltd
Current assignee: Li Jianghong
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-05-04

Abstract

The invention discloses a tower crane, which structurally comprises a tower body, an operating platform, a movable arm, a mounting platform, an operating arm, a balancing weight block and a base, wherein the operating platform is arranged at the upper end of the tower body, the movable arm is arranged on the operating platform and turned upwards, the mounting platform is arranged on the side edge of the operating platform, the balancing weight block is arranged at one end of the movable arm, the bottom of the tower body is fixedly arranged on the base, the base is fixedly arranged on the ground, the lower end of the tower body is provided with a sinking type counterweight device, one end of the top of the sinking type counterweight device is nested in the middle of the tower body and is screwed and connected through a bolt, one end of the bottom of the sinking type counterweight device is connected with the outer surface of the base, the invention can extend the sinking type counterweight device outwards by arranging the sinking type counterweight device to form an outward expanding net-shaped support to support the tower body, and is externally provided, the resistance that dispersion wind speed caused to the body of the tower makes the body of the tower more stable, alleviates and rocks the degree, avoids collapsing.

Description

Tower crane

Technical Field

The invention relates to the field of construction equipment, in particular to a tower crane.

Background

The tower crane is also called a tower crane, and is the most common hoisting equipment on the construction site, which is lengthened section by section and used for hoisting construction raw materials such as reinforcing steel bars, wooden ridges, concrete, steel pipes and the like for construction.

Disclosure of Invention

Aiming at the defects of the prior art, the invention is realized by the following technical scheme: a tower crane structurally comprises a tower body, an operating platform, a movable arm, a mounting platform, an operating arm, a balancing weight block and a base, wherein the operating platform is arranged at the upper end of the tower body, the movable arm is arranged on the operating platform and turns upwards, the mounting platform is arranged on the side edge of the operating platform, the balancing weight block is arranged at one end of the movable arm, the operating arm is arranged at the other end of the movable arm, the bottom of the tower body is fixedly arranged on the base, the base is fixedly arranged on the ground, the lower end of the tower body is provided with a sinking type counterweight device, one end of the top of the sinking type counterweight device is embedded at the middle position of the tower body and is connected with the middle position of the tower body through screwing bolts, one end of the bottom of the sinking type counterweight device is connected with the outer surface of the base, the sinking type counterweight device comprises an upper fixing seat, a balancing support rod, and it is fixed to screw through the bolt, balanced branch top one end links to each other with last fixing base outside activity, balanced branch middle part links to each other with the cooperation of lift regulation seat, balanced branch bottom one end and balanced counter weight device active link, lift regulation seat cover is in the body of the tower outside, the transversal rectangle form of personally submitting of lift regulation seat, hydraulic means top one end links to each other with lift regulation seat bottom surface is fixed, hydraulic means bottom one end is located on the base, bolt and base fixed surface are connected are passed through to horizontal telescopic link one end, the horizontal telescopic link other end links to each other with balanced counter weight device inboard is fixed.

As a further optimization of the technical scheme, the balance supporting rod, the transverse telescopic rod and the balance weight device are provided with 4 groups and are distributed in a cross shape by taking the tower body as the center.

As a further optimization of the technical scheme, the side edge of the upper fixed seat is provided with 4 pin seats, and the upper fixed seat is movably connected with the top of the balance supporting rod through a small left side.

As a further optimization of the technical scheme, the balance support rod is provided with a sliding inner groove and a connecting empty rail, the sliding inner groove and the balance support rod are of an integrated structure, the balance support rod is movably connected with the lifting adjusting seat through the sliding inner groove, the connecting empty rail and the balance support rod are of an integrated structure, the connecting empty rail is arranged below the sliding inner groove, the lower end of the balance support rod, namely the outer side of the connecting empty rail is in an arc shape, and the balance support rod is connected with the balance weight device in a nested manner through the connecting empty rail.

As a further optimization of the technical scheme, the lifting adjusting seat is provided with adjusting control arms and a top limiting seat, the number of the adjusting control arms is 4, the adjusting control arms are respectively and fixedly connected to the peripheral surface of the lifting adjusting seat, the lifting adjusting seat is connected with the balance supporting rod through the adjusting control arms, one end of the outer side of each adjusting control arm is provided with a sliding wheel which is embedded into the sliding inner groove and movably connected with the sliding inner groove, the top limiting seat is arranged above the lifting adjusting seat and fixed on the tower body through bolts to play a limiting role on the lifting adjusting seat, the lifting adjusting seat is more stable when the lifting adjusting seat is hydraulically jacked up, the sliding wheel of the adjusting control arms acts on the sliding inner groove to achieve the functions of withdrawing the balance supporting rod and pushing out the balance supporting rod, the inner side of the tower body is provided with a lifting track, the lifting track is provided with 4 tracks, and the inner side of the lifting adjusting seat is nested with the lifting track, the lifting adjusting seat is connected with the lifting rail to realize lifting and sliding.

As the further optimization of this technical scheme, the balance weight device is by locating piece, horizontal pole, inner groovy, the mechanism that increases weight, metal pipe, counter weight case main part, the locating piece is equipped with 2 to locate counter weight case main part upper surface respectively, the horizontal pole is connected between 2 locating pieces, counter weight case main part passes through the horizontal pole and links to each other with balanced branch, counter weight case main part middle part is located to the inner groovy, and the balanced branch of being convenient for slides, the mechanism that increases weight is equipped with 2 groups, locates the inside both sides of counter weight case main part respectively, counter weight case main part bottom is located to the metal pipe to be equipped with 3, when balanced branch bottom one end is extrapolated or the internal migration, the removal of realizing counter weight case main part is convenient for through the.

As the further optimization of this technical scheme, it is unanimous to increase weight mechanism structure to be the symmetric form and distribute, it includes stripper groove, stripper, filler storehouse, discharge opening to increase weight the mechanism, stripper groove, filler storehouse are the integral structure with the weight box main part respectively, the filler storehouse outside is located to the stripper groove, stripper upper portion inlays in the stripper inslot, and on the discharge opening was located to the bottom, the discharge opening is located counterweight box main part side to locate the stripper groove below, the filler bottom of the storehouse is the inclined plane, and the low interior height of outer, the material of being convenient for leaks.

As the further optimization of this technical scheme, the counter weight box main part is equipped with the chase and is connected with the stripper cooperation, the chase is equipped with 2, is the symmetric distribution to locate the stripper below respectively, all be equipped with in the chase group and remove the material strip, remove the material torsional spring, remove material torsional spring top one end and remove the material strip bottom surface and be connected, bottom one end is fixed in the chase inner bottom surface, remove the material strip and locate the inside upper end of chase, inlay the closure that realizes the filler bin side in the chase when the stripper whereabouts.

Advantageous effects

The invention relates to a tower crane, which forces an upper fixed seat to move upwards to the bottom surface of a top limiting seat along a lifting track of a tower body by driving a hydraulic device, four adjusting control arms fixedly connected with the upper fixed seat move upwards, one end of the outer side of each adjusting control arm is movably connected with a sliding inner groove on a balance support rod through a sliding wheel, so that when the adjusting control arms move upwards, the bottoms of four groups of balance support rods expand outwards, the bottoms of the balance support rods are movably connected with a balance weight device through connecting empty rails, the four groups of balance weight devices move outwards to the maximum, at the moment, the balance support rods, the lifting adjusting seats, a transverse telescopic rod and the balance weight device form an expanding bracket, the outward inclination angle of the balance support rods is increased, the gravity center of the tower body moves downwards, the received wind resistance is dispersed to a sunken weight device, the reinforcement of the tower body is realized, and under the weight of the balance weight, the tower body is more stable; can be according to job site's demand through being equipped with the mechanism that increases weight, carry out the filler device to balanced counter weight device, the material of packing includes but not limited to stone, cement yellow sand etc. can move the back outside the counter weight box main part and pack the weight gain to the filler storehouse, pull up the stripper up during unloading, the material that increases weight in the filler storehouse can be followed the inclined plane and pour over and go out by the discharge opening, and plate slot and stripper nested connection in addition in the counter weight box main part, when the filler storehouse is closed to the side, the stripper is pulled down, just imbeds in the board inslot in the bottom. The material removing strip capable of springing can prevent the weight increasing material from being clamped into the plate groove.

Compared with the prior art, the invention has the following advantages:

according to the invention, the sinking type counterweight device is arranged, so that the sinking type counterweight device can be extended outwards in windy weather to form an outward-expanding type reticular support to support the tower body, and the counterweight device is arranged outside the tower body to reduce the gravity center of the tower body, disperse the resistance of wind speed to the tower body, stabilize the tower body, reduce the shaking degree and avoid collapse.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural diagram of a tower crane according to the present invention.

Fig. 2 is a schematic structural diagram of the sinking weight device of the present invention.

Fig. 3 is a schematic structural view of the lower end of the balance bar of the present invention.

Fig. 4 is a schematic side view of the balance weight device of the present invention.

FIG. 5 is an enlarged schematic view of the plate well of the present invention.

In the figure: the device comprises a tower body 1, an operating platform 2, a movable arm 3, an installation platform 4, an operating arm 5, a balance weight block 6, a base 7, a sunken balance weight device 10, an upper fixing seat 101, a balance support rod 102, a lifting adjusting seat 103, a hydraulic device 104, a transverse telescopic rod 105, a balance weight device 106, a pin seat 1a, a sliding inner groove 2a, a connecting empty rail 2b, an adjusting control arm 3a, a top limiting seat 3c, a lifting rail 3b, a positioning block 1061, a cross rod 1062, an inner groove 1063, a weight increasing mechanism 1064, a metal round pipe 1065, a balance weight box main body 1066, a push plate groove 4a, a discharging plate 4b, a filling bin 4c, a discharging opening 4d, a plate groove z, a material removing strip z1 and a material removing torsion spring z 2.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the following description and the accompanying drawings further illustrate the preferred embodiments of the invention.

Example one

Referring to fig. 1-4, the present invention provides a tower crane, which structurally comprises a tower body 1, an operation platform 2, a movable arm 3, a mounting platform 4, an operation arm 5, a counterweight gauge block 6 and a base 7, wherein the operation platform 2 is arranged at the upper end of the tower body 1, the movable arm 3 is arranged at the upper end of the operation platform 2, the mounting platform 4 is arranged at the side edge of the operation platform 2, the counterweight gauge block 6 is arranged at one end of the movable arm 3, the operation arm 5 is arranged at the other end of the movable arm 3, the bottom of the tower body 1 is fixedly arranged on the base 7, and the base 7 is fixedly arranged on the ground;

a sinking type counterweight device 10 is arranged at the lower end of the tower body 1, one end of the top of the sinking type counterweight device 10 is nested in the middle of the tower body 1 and is connected in a screwing mode through a bolt, and one end of the bottom of the sinking type counterweight device 10 is connected with the outer surface of the base 7;

the sinking type counterweight device 10 comprises an upper fixed seat 101, a balance supporting rod 102, a lifting adjusting seat 103, a hydraulic device 104, a transverse telescopic rod 105 and a counterweight device 106, wherein the upper fixed seat 101 is nested on the outer surface of the tower body 1, and is screwed and fixed by bolts, one end of the top of the balance supporting rod 102 is movably connected with the outer side of the upper fixed seat 101, the middle part of the balance supporting rod 102 is connected with the lifting adjusting seat 103 in a matching way, one end of the bottom of the balance supporting rod 102 is movably connected with the balance weight device 106, the lifting adjusting seat 103 is sleeved outside the tower body, the cross section of the lifting adjusting seat 103 is rectangular, one end of the top of the hydraulic device 104 is fixedly connected with the bottom surface of the lifting adjusting seat 103, one end of the bottom of the hydraulic device 104 is arranged on the base 7, one end of the transverse telescopic rod 105 is fixedly connected with the surface of the base 7 through a bolt, and the other end of the transverse telescopic rod 105 is fixedly connected with the inner side of the balance weight device 106.

The balance supporting rods 102, the transverse telescopic rods 105 and the balance weight devices 106 are all provided with 4 groups and are distributed in a cross shape by taking the tower body 1 as the center.

Go up fixing base 101 side and be equipped with key seat 1a, key seat 1a is equipped with 4, go up fixing base 101 through little left 1a and balance strut 102 top activity link to each other.

The balance support rod 102 is provided with a sliding inner groove 2a and a connecting empty rail 2b, the sliding inner groove 2a and the balance support rod 102 are of an integrated structure, the balance support rod 102 is movably connected with a lifting adjusting seat 103 through the sliding inner groove 2a, the connecting empty rail 2b and the balance support rod 102 are of an integrated structure, the connecting empty rail 2b is arranged below the sliding inner groove 2a, the lower end of the balance support rod 102, namely the outer side of the connecting empty rail 2b is arc-shaped, and the balance support rod 102 is connected with a balance weight device 106 through the connecting empty rail 2b in a nested mode.

The lifting adjusting seat 103 is provided with an adjusting control arm 3a and a top limiting seat 3c, the number of the adjusting control arms 3a is 4, the adjusting control arms are respectively and fixedly connected with the peripheral surface of the lifting adjusting seat 103, the lifting adjusting seat 103 is connected with the balance supporting rod 102 through the adjusting control arm 3a, one end of the outer side of the adjusting control arm 3a is provided with a sliding wheel which is embedded in the sliding inner groove 2a and movably connected with the sliding inner groove, the top limiting seat 3c is arranged above the lifting adjusting seat 103 and fixed on the tower body 1 through a bolt, the lifting adjusting seat 103 is limited, when the lifting adjusting seat 103 is lifted up hydraulically, the lifting adjusting seat 103 is more stable, the sliding wheel of the inner groove of the adjusting control arm 3a acts on the sliding inner groove 2a to realize the effects of withdrawing the balance supporting rod 102 and pushing out the balance supporting rod 102, the inner side of the tower body 1 is provided with a lifting track 3b, and the lifting track 3b is provided with, the inner side of the lifting adjusting seat 103 is nested and connected with the lifting rail 3b, and the lifting adjusting seat 103 is connected with the lifting rail 3b to realize lifting and sliding.

The balance weight device 106 is composed of a positioning block 1061, a cross rod 1062, an inner groove 1063, a weight increasing mechanism 1064, a metal round tube 1065 and a weight box main body 1066, wherein the positioning block 1061 is provided with 2 pieces and respectively arranged on the upper surface of the weight box main body 1066, the cross rod 1062 is connected between the 2 positioning blocks 1061, the weight box main body 1066 is connected with the balance support rod 102 through the cross rod 1062, the inner groove 1063 is arranged in the middle of the weight box main body 1066, so that the balance support rod 102 can slide, the weight increasing mechanism 1064 is provided with 2 groups and respectively arranged on two sides inside the weight box main body 1066, the metal round tube 1065 is arranged at the bottom of the weight box main body 1066 and is provided with 3 pieces, when one end of the bottom of the balance support rod 102 is pushed out or moved in, the movement of the weight box main body 1066 can be conveniently realized through the rolling of the metal.

When in use, the upper fixed seat 101 is forced to move upwards to the bottom surface of the top limiting seat 3c along the lifting track 3b of the tower body by driving the hydraulic device 104, the 4 adjusting control arms 3a fixedly connected with the upper fixed seat 101 move upwards, one end of the outer side of the adjusting control arm 3a is movably connected with the sliding inner groove 2a on the balance supporting rod 102 through a sliding wheel, so that when the adjusting control arm 3a moves upwards, the bottoms of the 4 groups of balance supporting rods 102 expand outwards, the bottom of the balance supporting rod 102 is movably connected with the balance weight device 106 through a connecting empty track 2b, so that the 4 groups of balance weight devices 106 move outwards to the maximum extent, at the moment, the balance supporting rod 102, the lifting adjusting seat 103, the transverse telescopic rod 105 and the balance weight device 106 form an expanding bracket, the outward inclination angle of the balance supporting rod 102 is increased, the gravity center of the tower body 1 moves downwards, and the wind resistance is dispersed to the sunken weight device, the tower 1 is reinforced and the tower is more stable under the weight of the counter-weight device 106.

Example two

Referring to fig. 4-5, the present invention provides a tower crane, which structurally includes a weight increasing mechanism 1064 and a counterweight box main body 1066, where the weight increasing mechanism 1064 includes a push plate slot 4a, a discharge plate 4b, a filler bin 4c, and a discharge opening 4d, the push plate slot 4a and the filler bin 4c are respectively integrated with the counterweight box main body 1066, the push plate slot 4a is disposed outside the filler bin 4c, an upper portion of the discharge plate 4b is embedded in the push plate slot 4a, a bottom portion of the discharge plate is disposed on the discharge opening 4d, the discharge opening 4d is disposed on a side edge of the counterweight box main body 1066 and below the push plate slot 4a, and a bottom surface of the filler bin 4c is an inclined surface, low outside and high inside, so as to facilitate material leakage.

The weight box main part 1066 is equipped with the cooperation of board groove z and stripper 4b and is connected, board groove z is equipped with 2, is the symmetric distribution to locate the stripper 4b below respectively, all be equipped with in the board groove group z and remove material strip z1, remove material torsional spring z2, remove material torsional spring z2 top one end and remove material strip z1 bottom surface and be connected, bottom one end is fixed in board groove z bottom surface, remove the inside upper end of material strip z1 and locate the inside upper end of board groove z, imbed the board groove z when stripper 4b whereabouts and realize the closure of filler bin 4c side in the board groove z.

On the basis of the first embodiment, the weight increasing mechanism 1064 is arranged to perform a filling operation on the balance weight device 106 according to the requirement of a construction site, the filled materials include but are not limited to stones, cement yellow sand, etc., the weight increasing operation can be performed on the filler bin 4c after the weight box main body 1066 is moved outward, the discharging plate 4b is pulled upward during discharging, the weight increased materials in the filler bin 4c can be discharged from the discharging port 4d along the inclined surface, the weight box main body 1066 is further provided with the plate slot z in nested connection with the discharging plate 4b, when the side surface is closed to the filler bin 4c, the discharging plate 4b is pulled downward, and the bottom is embedded into the plate slot z. The springable material removal strip z1 prevents the weight gain material from getting stuck in the plate channel z.

While there have been shown and described what are at present considered the fundamental principles of the invention, the essential features and advantages thereof, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but rather, is capable of numerous changes and modifications in various forms without departing from the spirit or essential characteristics thereof, and it is intended that the invention be limited not by the foregoing descriptions, but rather by the appended claims and their equivalents.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a tower crane, its structure includes body of the tower (1), operation panel (2), swing arm (3), mounting platform (4), operation arm (5), balanced weight piece (6), base (7), body of the tower (1) upper end is located in operation panel (2), swing arm (3) are located operation panel (2) and are upturned, operation panel (2) side is located in mounting platform (4), swing arm (3) one end is located in balanced weight piece (6), swing arm (3) other end is located in operation arm (5), body of the tower (1) bottom is fixed to be located on base (7), base (7) are fixed to be located ground, its characterized in that:

a sinking type counterweight device (10) is arranged at the lower end of the tower body (1), one end of the top of the sinking type counterweight device (10) is nested in the middle of the tower body (1) and is connected with the middle of the tower body through a bolt in a screwing mode, and one end of the bottom of the sinking type counterweight device (10) is connected with the outer surface of the base (7);

the sunken counterweight device (10) comprises an upper fixing seat (101), a balance supporting rod (102), a lifting adjusting seat (103), a hydraulic device (104), a transverse telescopic rod (105) and a balance counterweight device (106), wherein the upper fixing seat (101) is nested on the outer surface of the tower body (1) and is fixed by screwing a bolt, one end of the top of the balance supporting rod (102) is movably connected with the outer side of the upper fixing seat (101), the middle of the balance supporting rod (102) is matched and connected with the lifting adjusting seat (103), one end of the bottom of the balance supporting rod (102) is movably connected with the balance counterweight device (106), the lifting adjusting seat (103) is sleeved on the outer side of the tower body, the cross section of the lifting adjusting seat (103) is rectangular, one end of the top of the hydraulic device (104) is fixedly connected with the bottom surface of the lifting adjusting seat (103), one end of the bottom of the hydraulic device (104) is arranged on the, one end of the transverse telescopic rod (105) is fixedly connected with the surface of the base (7) through a bolt, and the other end of the transverse telescopic rod (105) is fixedly connected with the inner side of the balance weight device (106).

2. A tower crane according to claim 1, wherein: the balance supporting rod (102), the transverse telescopic rod (105) and the balance weight device (106) are all provided with 4 groups and are distributed in a cross shape by taking the tower body (1) as the center.

3. A tower crane according to claim 2, wherein: go up fixing base (101) side and be equipped with key seat (1a), key seat (1a) is equipped with 4, go up fixing base (101) and link to each other with balanced branch (102) top activity through the little left (1 a).

4. A tower crane according to claim 1, wherein: be equipped with on balance support rod (102) and slide inside groove (2a), connect air rail (2b), it is the integral structure to slide inside groove (2a) and balance support rod (102), balance support rod (102) are through sliding inside groove (2a) and lift adjustment seat (103) swing joint, it is the integral structure to connect air rail (2b) and balance support rod (102), it locates to slide inside groove (2a) below to connect air rail (2b), balance support rod (102) lower extreme, promptly connect air rail (2b) outside and personally submit the arc, balance support rod (102) are through connecting air rail (2b) and balance weight device (106) nested the linking to each other.

5. A tower crane according to claim 1 or 4, wherein: lift adjustment seat (103) are equipped with regulation control arm (3a), limit footstock (3c), regulation control arm (3a) are equipped with 4, respectively fixed connection in lift adjustment seat (103) surface all around, lift adjustment seat (103) are connected with balanced branch (102) through regulation control arm (3a), regulation control arm (3a) outside one end is equipped with the movable connection with it in the inside groove (2a) is slided in this movable connection of pulley embedding, limit footstock (3c) are located lift adjustment seat (103) top to fix on body of the tower (1) through the bolt, body of the tower (1) inboard is equipped with lift track (3b), lift track (3b) are equipped with 4, lift adjustment seat (103) inboard links to each other with lift track (3b) nestification.

6. A tower crane according to claim 1, wherein: balance weight device (106) by locating piece (1061), horizontal pole (1062), inner grove (1063), weight mechanism (1064), metal pipe (1065), weight box main part (1066), locating piece (1061) is equipped with 2 to locate weight box main part (1066) upper surface respectively, horizontal pole (1062) are connected between 2 locating pieces (1061), weight box main part (1066) link to each other with balanced branch (102) through horizontal pole (1062), weight box main part (1066) middle part is located in inner grove (1063), weight mechanism (1064) are equipped with 2 groups, locate weight box main part (1066) inside both sides respectively, weight box main part (1066) bottom is located in metal pipe (1065) to be equipped with 3.

7. A tower crane according to claim 6, wherein: weight gain mechanism (1064) structure is unanimous to be the symmetry form and distribute, weight gain mechanism (1064) includes push plate groove (4a), stripper (4b), filler bin (4c), discharge opening (4d), push plate groove (4a), filler bin (4c) are the integral structure with weight box main part (1066) respectively, the filler bin (4c) outside is located in push plate groove (4a), stripper (4b) upper portion inlays in push plate groove (4a), and on discharge opening (4d) was located to the bottom, counter weight box main part (1066) side is located in discharge opening (4d) to locate push plate groove (4a) below, filler bin (4c) bottom surface is the inclined plane, outer low internal height.

8. A tower crane according to claim 7, wherein: the balance weight box main body (1066) is provided with a plate groove (z) and is connected with a discharging plate (4b) in a matched mode, the plate groove (z) is provided with 2 plates which are symmetrically distributed and are respectively arranged below the discharging plate (4b), a material removing strip (z1) and a material removing torsion spring (z2) are arranged in the plate groove group (z), one end of the top of the material removing torsion spring (z2) is connected with the bottom surface of the material removing strip (z1), one end of the bottom of the material removing torsion spring is fixed on the inner bottom surface of the plate groove (z), the material removing strip (z1) is arranged at the inner upper end of the plate groove (z), and the side surface of the filling bin (4c) is sealed in the plate groove (z) in an embedded mode when the discharging plate (4b) falls.