CN218166836U - A material mixing device for terrazzo production - Google Patents

Abstract

The utility model relates to a building materials equips the field, concretely relates to a material mixing device for terrazzo production, including agitator subassembly, stirring rake subassembly, revolving door subassembly and support, the agitator subassembly be equipped with first staving and second staving, be equipped with a plurality of barrel wall discharge openings on the first staving; the rotating door assembly is provided with a rotatable door cover, the door cover is arranged outside the first barrel body, and the door cover is provided with a plurality of cover wall discharge holes corresponding to the barrel wall discharge holes. The cover wall discharge hole and the barrel wall discharge hole can be communicated through the rotating door cover, so that materials in the first barrel body flow out of the discharge hole and scatter into the second barrel body, and the rotating door cover can shield the barrel wall discharge hole to prevent the materials in the first barrel body from flowing out. The utility model discloses utilize the rotatory bucket wall discharge opening that makes of door casing to be blocked up or remove the shutoff, can scatter each region in the second staving with the material after blending in the first staving, make the secondary stir swiftly more stir and improve stirring efficiency and product quality.

Description

A material mixing device for terrazzo production

Technical Field

The utility model relates to a building materials equips the field, concretely relates to a material mixing device for terrazzo production.

Background

The artificially made terrazzo can be individually designed and constructed according to the needs of users due to appearance and texture, and is widely applied to the building and decoration industries. The production of terrazzo usually requires that aggregates such as sand, crushed stone particles, crushed glass particles and the like are mixed with materials such as water, cement, binder, pigment and the like to be made into a concrete finished product, and then the concrete finished product is poured, dried and ground. Because the proportion difference of various materials used for producing the terrazzo is large, for example, the proportion of pigments for color matching, colored glass cullet particles and the like is very small, if all the materials are stirred simultaneously, the materials with small proportion are difficult to be uniformly mixed. The common stirring method is to mix and stir a plurality of materials with small proportion and a small part of one or more materials with large proportion, and then to stir the mixture after stirring and the rest most of the materials for the second time. At present some agitating unit through the mode that sets up main stirring unit and vice stirring unit, will account for a few less materials earlier and stir the back reuse conveying mechanism with vice stirring unit and concentrate and send to main stirring unit and carry out the secondary stirring, though be of value to the homogeneity that improves the stirring like this, nevertheless because the material of stirring with vice stirring unit is not the dispersion and sends into each region that goes to cover in the main stirring unit, the homogeneity of secondary stirring still can not reach better effect. Sometimes, the stirring time of the main stirring unit needs to be prolonged in order to improve the uniformity, but the cement and the binder are easy to cure in advance by prolonging the stirring time, which is not beneficial to ensuring the product quality. In view of this, there is a need for an improved stirring device.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model discloses a material stirring device for terrazzo production, which comprises a stirring barrel component, a stirring paddle component, a rotating door component and a bracket, wherein the stirring barrel component is provided with a first barrel body and a second barrel body which are arranged from top to bottom; materials in the two barrels are respectively stirred by a first stirring paddle and a second stirring paddle of stirring paddle components arranged in various barrels; the revolving door component is provided with a rotatable door cover, the door cover is arranged outside the first barrel body, and the door cover is provided with a plurality of cover wall discharging holes which are in one-to-one correspondence with the plurality of barrel wall discharging holes. The cover wall discharge hole and the barrel wall discharge hole can be communicated through the rotating door cover, so that materials in the first barrel body flow out of the discharge hole and scatter into the second barrel body, and the rotating door cover can shield the barrel wall discharge hole to prevent the materials in the first barrel body from flowing out. The utility model discloses a first staving and the second staving of placing about setting up and arrange the rotatable door casing of first staving below in, be equipped with on the door casing with a plurality of cover wall discharge opening one-to-one on the first staving a plurality of cover wall discharge opening, utilize the door casing rotation to make the bucket wall discharge opening by the shutoff or relieve the shutoff, can stir the material in the first staving and can carry out the secondary stirring with each region that the mixture after mixing scatters to in the second staving, make the secondary stirring can swiftly stir evenly more, thereby can improve stirring efficiency and product quality.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a material mixing device for terrazzo production, includes the support, support top-down be equipped with roof, baffle and chassis, its characterized in that in proper order: still include agitator subassembly, stirring rake subassembly and revolving door subassembly, the agitator subassembly be equipped with about two-layer stirring barrel body and go up the stirring barrel body suspension in the top of stirring barrel body down, the lower part of stirring barrel body is equipped with a plurality of discharge opening on it, in its discharge opening scattering of material accessible in the last stirring barrel body falls down the stirring barrel body, the stirring rake subassembly be equipped with about two-layer stirring rake and about two-layer stirring rake arrange respectively in the upper and lower two-layer stirring barrel body of stirring barrel subassembly in be used for stirring the material in the staving that corresponds separately, the revolving door subassembly be equipped with rotatable cover body, the outside of the last stirring barrel body of stirring barrel subassembly is arranged in to this cover body is used for carrying out the shutoff or removing the shutoff to the discharge gate of last stirring barrel body.

The stirring barrel component comprises a first barrel body, a second barrel body, a first feeding port, a second feeding port and a discharging port, wherein the first barrel body is a cavity body with a conical lower part and a cylindrical opening upwards, the upper part of the cavity body is a cylindrical cavity body with an upwards opening, a plurality of barrel wall discharging holes are uniformly distributed on the conical wall of the lower part of the first barrel body, the second barrel body is a cylindrical cavity body with an upwards opening, the first barrel body is suspended above the opening of the second barrel body, the lower part of the first barrel body is arranged in the second barrel body, the first feeding port and the second feeding port are respectively suspended above the first barrel body and the second barrel body, the lower ends of the first feeding port and the second feeding port are respectively inserted into the first barrel body and the second barrel body, the discharging port is a discharging pipeline with a valve, and the discharging port is fixedly connected to the bottom of the second barrel body.

The first barrel body and the first feeding port are fixedly hung on a top plate of the support, the bottom of the second barrel body is fixedly connected to a bottom frame of the support, and the second feeding port penetrates through the top plate of the support and the partition plate and is fixedly connected to the top plate.

The stirring rake subassembly include first stirring rake, second stirring rake, (mixing) shaft and motor, first stirring rake and second stirring rake include a plurality of puddler and the lock solid a plurality of paddle on a plurality of puddler respectively, all be equipped with the logical groove of fretwork on every paddle, the paddle of first stirring rake be the slope form, the inclination of its downside is unanimous with the inclination of the lower part conical surface of first staving, the paddle of second stirring rake be the rectangle, first stirring rake and the equal lock solid of second stirring rake just first stirring rake are arranged in the top of second stirring rake on the (mixing) shaft, a plurality of puddler of first stirring rake just is radially equipartition around the (mixing) shaft on the coplanar, a plurality of puddler of second stirring rake just is radially equipartition around the (mixing) shaft on the coplanar, the (mixing) shaft vertically put at the center of first staving and second staving and rotate with the bearing frame of bearing of area and connect on first staving and second staving, the upper end of motor be connected on the lock solid of support, the motor.

The paddle of first stirring rake and the paddle of second stirring rake arrange in respectively in first staving and the second staving and the lower side of the paddle of first stirring rake and the lower side of the paddle of second stirring rake laminate with the toper inside wall of first staving and the inboard diapire of second staving respectively.

The rotary door assembly comprises a door cover and a rotary supporting piece, wherein the lower part of the door cover is conical, the upper part of the door cover is a cylindrical cavity body with an upward opening, an inner cavity of the door cover is matched with the outer wall of the first barrel body, a plurality of cover wall discharging holes are uniformly distributed on the conical wall at the lower part of the door cover and correspond to the barrel wall discharging holes on the first barrel body one by one, the aperture of the cover wall discharging holes is consistent with that of the barrel wall discharging holes, the door cover is movably sleeved on the outer wall of the first barrel body, an annular convex edge protruding outwards is arranged at the opening part of the door cover, the rotary supporting piece is a plane bearing or a rotary sliding ring with an annular guide groove, the upper part of the rotary supporting piece is locked under the annular convex edge at the opening part of the door cover, the lower part of the rotary supporting piece is locked on a partition plate of the support, and the door cover can rotate around the first barrel body.

The revolving door subassembly still include gear block, pinion, pivot and hand wheel, gear block and pinion be a pair of driven gear pair that meshes, gear block for by the arc piece of the outer tooth of taking of a section that circles at the ring gear, gear block rigid coupling is on the middle part outer wall of door shield, the pinion arrange one side of gear block in, the pivot put immediately one side at gear block and rotate with the bearing frame of taking the bearing and connect on the roof and the baffle of support, pinion and hand wheel lock solid respectively in the lower extreme and the upper end of pivot, the hand wheel can order about the pivot and drive the pinion rotation.

As can be seen from the above description, the utility model provides a pair of a material mixing device for terrazzo production's advantage lies in: firstly, a first barrel body of the stirring barrel assembly is suspended on a second barrel body, a plurality of barrel wall discharge holes are formed in the lower portion of the first barrel body, and materials in the barrel can be scattered into the second barrel body through the discharge holes; the revolving door subassembly is equipped with rotatable door casing and this door casing arranges the outside of first staving in, be equipped with on the door casing with a plurality of cover wall discharge opening of a plurality of bucket wall discharge opening one-to-one on the first staving, utilize the door casing rotation to make the bucket wall discharge opening by the shutoff or relieve the shutoff, can stir the material in the first staving and can scatter each region of falling the mixture after blending in the second staving and carry out the secondary stirring, make the secondary stirring can swiftly stir evenly more, thereby can improve stirring efficiency and product quality. Secondly, the first barrel body and the second barrel body of the stirring barrel component are arranged up and down, and the first stirring paddle and the second stirring paddle of the stirring paddle component are arranged on the same stirring shaft, so that the structure of the stirring device is more compact, the mixture stirred in the first barrel body can be directly scattered into the second barrel body for secondary stirring, a conveying mechanism is not required to be arranged in the middle, the equipment cost and the installation field can be saved, and the stirring efficiency can be improved. The utility model relates to a rationally, simple structure, low cost, facilitate promotion.

Drawings

FIG. 1 is a general schematic view of a material stirring device for terrazzo production according to the present invention;

FIG. 2 is an enlarged schematic view of the agitator assembly;

FIG. 3 is an enlarged view of the direction A in FIG. 2;

FIG. 4 is an enlarged schematic view of the paddle assembly;

FIG. 5 is an enlarged schematic view of a revolving door assembly;

fig. 6 is an enlarged view of B-B in fig. 5.

Reference numerals are as follows:

1, a stirring barrel component; 11 a first barrel; 111 a bucket wall discharge hole; 12 a second tub; 13 a first feeding port; 14 a second feeding port; 15 a discharge opening; 2, a stirring paddle component; 21 a first stirring paddle; 22 a second paddle; 23 stirring the shaft; a 24 motor; 3 a revolving door assembly; 31 a door shield; 311 cover wall discharge holes; 32 rotating the support; 33 large gear blocks; 34 pinion gear; 35 a rotating shaft; 36 hand wheels; 4, supporting the bracket; 41 a top plate; 42 a partition plate; 43 chassis.

Detailed Description

The present invention will be further described with reference to the following detailed description.

As shown in figure 1, the material stirring device for terrazzo production comprises a stirring barrel component 1, a stirring paddle component 2, a rotating door component 3 and a support 4. 4 top-down of support be equipped with roof 41, baffle 42 and chassis 43 in proper order, agitator assembly 1 be equipped with upper and lower two-layer agitator tank body and go up agitator tank body suspension in the top of agitator tank body down, the lower part of agitator tank body is equipped with a plurality of discharge opening on it, in the material accessible of going up in the agitator tank body its discharge opening scattering falls down the agitator tank body, agitator paddle assembly 2 be equipped with about two-layer stirring rake and two-layer stirring rake about and arrange respectively in the upper and lower two-layer agitator tank body of agitator assembly 1 and be used for stirring the material in the staving that corresponds separately, revolving door subassembly 3 be equipped with the rotatable cover body, the outside of the last agitator tank body of agitator assembly 1 is arranged in to this cover body is used for carrying out the shutoff or removes the shutoff to the discharge gate of last agitator tank body.

As shown in fig. 1 to 3, the stirring barrel assembly 1 of the present invention includes a first barrel body 11, a second barrel body 12, a first feeding port 13, a second feeding port 14 and a discharging port 15, wherein the first barrel body 11 is a conical lower body, the upper part of the first barrel body is a hollow cavity with a cylindrical opening, a plurality of barrel wall discharging holes 111 are uniformly distributed on the conical lower wall, the second barrel body 12 is a cylindrical hollow cavity with an opening, the first barrel body 11 is suspended above the opening of the second barrel body 12 and the lower part of the first barrel body 11 is disposed in the second barrel body 12, the first feeding port 13 and the second feeding port 14 are respectively suspended above the first barrel body 11 and the second barrel body 12, the lower end of the first feeding port 13 and the lower end of the second feeding port 14 are respectively inserted into the first barrel body 11 and the second barrel body 12, the discharging port 15 is a discharging pipeline with a valve, and the discharging port 15 is fixedly connected to the bottom of the second barrel body 12. The first barrel body 11 and the first feeding port 13 are both fixedly hung on a top plate 41 of the support 4, the bottom of the second barrel body 12 is fixedly connected on a bottom frame 43 of the support 4, and the second feeding port 14 passes through the top plate 41 and the partition plate 42 of the support 4 and is fixedly connected on the top plate 41.

As shown in fig. 1, fig. 2 and fig. 4, the stirring paddle assembly 2 includes first stirring paddle 21, second stirring paddle 22, (mixing) shaft 23 and motor 24, first stirring paddle 21 and second stirring paddle 22 include a plurality of stirring arm and a plurality of paddle of lock solid on a plurality of stirring arm respectively, all be equipped with the logical groove of fretwork on every paddle, first stirring paddle 21's paddle be the slope form, the inclination of its lower side is unanimous with the inclination of the lower part conical surface of first bucket 11, second stirring paddle 22's paddle be the rectangle, first stirring paddle 21 and the equal lock solid of second stirring paddle 22 on (mixing) shaft 23 and first stirring paddle 21 arrange second stirring paddle 22's top in, a plurality of stirring arm of first stirring paddle 21 just is radially equipartition around (mixing) shaft 23 on the coplanar, a plurality of stirring arm of second stirring paddle 22 just is radially around (mixing) 23 on the coplanar, first stirring paddle 23 put upright first bucket 11 and second bucket 12 upright the equipartition of bearing support connect at the output shaft 24 of the motor on the axial bearing support and the first stirring shaft 23, the motor bearing support 11 and the lock solid are connected on the bearing support 24. The paddle of first stirring rake 21 and the paddle of second stirring rake 22 arrange in first staving 11 respectively and in second staving 12 and the lower side limit of the paddle of first stirring rake 21 and the lower side limit of the paddle of second stirring rake 22 respectively with the toper inside wall of first staving 11 and the inboard diapire laminating of second staving 12.

As shown in fig. 1, fig. 2, fig. 5 and fig. 6, the revolving door assembly 3 of the present invention includes a door shield 31, a rotation support member 32, a bull gear 33, a pinion 34, a rotating shaft 35 and a hand wheel 36, the door shield 31 is a cavity body with a conical lower part and a cylindrical upper opening, an inner cavity of the cavity body is matched with an outer wall of the first barrel 11, a plurality of cover wall discharge holes 311 are uniformly distributed on the conical lower wall of the door shield 31, and a plurality of cover wall discharge holes 311 are in one-to-one correspondence with a plurality of barrel wall discharge holes 111 on the first barrel 11, the aperture of the cover wall discharge hole 311 is consistent with the aperture of the barrel wall discharge holes 111, the door shield 31 is movably sleeved on the outer wall of the first barrel 11, the opening of the door shield 31 is provided with an annular convex edge protruding outward, the rotation support member 32 is a plane bearing or a rotation support member with an annular guide groove, the rotation support member 32 of the present embodiment is a rotation slip ring with an annular guide groove, the upper portion of the rotation support member 32 rotates around the lower opening of the door shield 31, and the lower support member 32 rotates around the first barrel locking plate 11, and the first barrel cover 11 is provided with a locking plate 42. Big gear block 33 and pinion 34 be a pair of driven gear pair of can meshing, big gear block 33 for by the arc piece of the one section area external tooth of intercepting on ring gear circle, big gear block 33 rigid coupling is on the middle part outer wall of door shield 31, pinion 34 arrange in big gear block 33 one side, pivot 35 put immediately one side of big gear block 33 and rotate on roof 41 and the baffle 42 of connection at support 4 with the bearing frame of taking the bearing, pinion 34 and hand wheel 36 lock solid respectively in the lower extreme and the upper end of pivot 35, hand wheel 36 can order about pivot 35 and drive pinion 34 and rotate.

A material mixing device application method for terrazzo production as follows:

firstly, a small part of materials with small proportion and one or more materials with large proportion are thrown into a first barrel body 11 from a first feeding port 13, and most of the rest materials are thrown into a second barrel body 12 from a second feeding port 14; the motor 24 of the stirring paddle assembly 2 is started to drive the first stirring paddle 21 and the second stirring paddle 22 to stir the materials in the first barrel body 11 and the second barrel body 12 respectively. Because the material volume in the first barrel 11 is less and is easy to stir, after the material in the first barrel 11 is stirred uniformly, the hand wheel 36 of the revolving door assembly 3 is rotated, the large gear block 33 is shifted through the small gear 34 on the rotating shaft 35 to drive the door cover 31 to slowly rotate, a plurality of cover wall discharging holes 311 on the door cover 31 correspond to a plurality of barrel wall discharging holes 111 on the first barrel 11, and the door cover 31 stops rotating, at the moment, the material mixed in the first barrel 11 is uniformly scattered into each area in the second barrel 12 through the barrel wall discharging holes 111 under the pushing of the first stirring paddle 21 and is mixed with the material in the second barrel 12, and the second stirring paddle 22 in the second barrel 12 is used for stirring again to make the mixing more uniform.

The utility model discloses a first staving and the second staving of placing about setting up and arrange the rotatable door casing of first staving below in, be equipped with on the door casing with a plurality of cover wall discharge opening one-to-one on the first staving a plurality of cover wall discharge opening, utilize the door casing rotation to make the bucket wall discharge opening by the shutoff or relieve the shutoff, can stir the material in the first staving and can carry out the secondary stirring with each region that the mixture after mixing scatters to in the second staving, make the secondary stirring can swiftly stir evenly more, thereby can improve stirring efficiency and product quality.

In the description of the present invention, terms such as "first", "second", etc. are used to define the position. The use of "first" and "second" is merely for convenience of simplifying the description, and no particular meaning is implied unless specifically stated to the contrary.

The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, and the present invention is to be modified immaterial by this concept, and all should belong to the act of infringing the protection scope of the present invention.

Claims (7)

1. The utility model provides a material agitating unit for terrazzo production, includes support (4), support (4) top-down be equipped with roof (41), baffle (42) and chassis (43) in proper order, its characterized in that: still include agitator subassembly (1), stirring rake subassembly (2) and revolving door subassembly (3), agitator subassembly (1) be equipped with about two-layer stirring barrel body and go up the stirring barrel body suspension in the top of stirring barrel body down, the lower part of stirring barrel body is equipped with a plurality of discharge opening on it, in the material accessible of going up in the stirring barrel body its discharge opening scattering falls down the stirring barrel body, stirring rake subassembly (2) be equipped with about two-layer stirring rake and about two-layer stirring rake arrange in the upper and lower two-layer stirring barrel body of stirring barrel subassembly (1) respectively, revolving door subassembly (3) be equipped with rotatable cover body, the outside of the last stirring barrel body that stirring barrel subassembly (1) was arranged in to this cover body is used for carrying out the shutoff or removing the shutoff to the discharge gate of last stirring barrel body.

2. A material mixing device for terrazzo production according to claim 1, characterized in that: the stirring barrel assembly (1) comprises a first barrel body (11), a second barrel body (12), a first feeding port (13), a second feeding port (14) and a discharging port (15), wherein the first barrel body (11) is a cavity body with a conical lower part and a cylindrical upward opening on the upper part, a plurality of barrel wall discharging holes (111) are uniformly distributed on the conical wall on the lower part of the first barrel body, the second barrel body (12) is a cylindrical cavity body with an upward opening, the first barrel body (11) is suspended above the opening of the second barrel body (12) and the lower part of the first barrel body (11) is arranged in the second barrel body (12), the first feeding port (13) and the second feeding port (14) are respectively suspended above the first barrel body (11) and the second barrel body (12), the lower end of the first feeding port (13) and the lower end of the second feeding port (14) are respectively inserted into the first barrel body (11) and the second barrel body (12), the discharging port (15) is a valve fixedly connected with the discharging port (15) at the bottom of the second barrel body (12).

3. A material mixing apparatus for terrazzo production according to claim 2, characterized in that: the first barrel body (11) and the first feeding port (13) are fixedly hung on a top plate (41) of the support (4), the bottom of the second barrel body (12) is fixedly connected to a bottom frame (43) of the support (4), and the second feeding port (14) penetrates through the top plate (41) and the partition plate (42) of the support (4) and is fixedly connected to the top plate (41).

4. A material mixing apparatus for terrazzo production according to claim 3, characterized in that: the stirring paddle component (2) comprises a first stirring paddle (21), a second stirring paddle (22), a stirring shaft (23) and a motor (24), the first stirring paddle (21) and the second stirring paddle (22) respectively comprise a plurality of stirring arms and a plurality of blades which are locked on the stirring arms, each blade is provided with a hollow through groove, the blades of the first stirring paddle (21) are inclined, the inclined angle of the lower side edge of the first barrel body is consistent with the inclined angle of the lower conical surface of the first barrel body (11), the blades of the second stirring paddle (22) are rectangular, the first stirring paddle (21) and the second stirring paddle (22) are locked on the stirring shaft (23) and the first stirring paddle (21) is arranged above the second stirring paddle (22), a plurality of stirring arms of the first stirring paddle (21) are uniformly distributed around the stirring shaft (23) in a radial manner on the same plane, a plurality of stirring arms of the second stirring paddle (22) are uniformly distributed around the stirring shaft (23) in a radial manner on the same plane, the stirring shaft (23) is vertically arranged at the centers of the first barrel body (11) and the second barrel body (12) and is rotationally connected to the first barrel body (11) and the second barrel body (12) by a bearing seat with a bearing, an output shaft of the motor (24) is connected with the upper end of the stirring shaft (23), and the motor (24) is locked on a top plate (41) of the bracket (4).

5. A material mixing apparatus for terrazzo production according to claim 4, characterized in that: the paddle of first stirring rake (21) and the paddle of second stirring rake (22) arrange in first staving (11) and second staving (12) respectively and the lower side of the paddle of first stirring rake (21) and the lower side of the paddle of second stirring rake (22) laminate with the inboard diapire of the toper inside wall of first staving (11) and second staving (12) respectively.

6. A material mixing device for terrazzo production according to claim 5, characterized in that: the rotary door assembly (3) comprises a door cover (31) and a rotary supporting piece (32), the door cover (31) is a cavity body with a conical lower part and a cylindrical upper part, an opening of the cavity body is upward, an inner cavity of the cavity body is matched with the outer wall of the first barrel body (11), a plurality of cover wall discharge holes (311) are uniformly distributed on the conical wall of the lower part of the door cover (31), the cover wall discharge holes (311) correspond to the barrel wall discharge holes (111) on the first barrel body (11) one by one, the aperture of the cover wall discharge holes (311) is consistent with that of the barrel wall discharge holes (111), the door cover (31) is movably sleeved on the outer wall of the first barrel body (11), an annular convex edge protruding outwards is arranged at the opening part of the door cover (31), the rotary supporting piece (32) is a plane bearing or a rotary sliding ring with an annular guide groove, the rotary supporting piece (32) is locked at the annular convex edge of the opening part of the door cover (31), and the lower part of the rotary supporting piece (32) is locked at the opening part of the door cover (31) and can rotate around the first barrel (11) and the partition plate (42) and the first barrel cover (11) can rotate.

7. A material mixing apparatus for terrazzo production according to claim 6, characterized in that: revolving door subassembly (3) still include gear block (33), pinion (34), pivot (35) and hand wheel (36), gear block (33) and pinion (34) be a pair of driven gear pair that meshes, gear block (33) for by the arc piece of taking the external tooth of a section of intercepting on ring gear, gear block (33) rigid coupling is on the middle part outer wall of door casing (31), pinion (34) place one side of gear block (33) in, pivot (35) put immediately one side of gear block (33) and rotate with the bearing frame of taking the bearing and connect on roof (41) and baffle (42) of support (4), pinion (34) and hand wheel (36) lock solid lower extreme and upper end at pivot (35) respectively.

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