CN211071759U

CN211071759U - Aluminum alloy die casting machine auxiliary structure

Info

Publication number: CN211071759U
Application number: CN201921674896.6U
Authority: CN
Inventors: 林荣斌
Original assignee: Foshan Nanhai Rongxin Metal Products Co ltd
Current assignee: Foshan Nanhai Rongxin Metal Products Co ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-07-24
Anticipated expiration: 2029-10-09

Abstract

The utility model discloses an aluminum alloy die casting machine auxiliary structure, comprising a base plate, the conversion regulating element, the positioning unit, the direction support element, the firm unit of direction positioning unit and direction, the upper end middle part of bottom plate is equipped with planar bearing, planar bearing's upper end is equipped with circular mould board, the upper end edge of circular mould board is equipped with the positioning slot that angular distribution such as, positioning slot's inside bottom is equipped with the mold core groove that the shape is not of uniform size, the upper end left side of bottom plate is equipped with L shape frame plate, be equipped with the hydraulic pump in the upper end mounting hole of L shape frame plate, this aluminum alloy die casting machine auxiliary structure, the operation is simple, realize efficient aluminum alloy die-casting shaping, personnel's work burden has been alleviateed, can be suitable for casting out the multiple shape and the size demand of aluminium alloy part according to the gear and the different contact places of the tooth of circular mould board outer.

Description

Aluminum alloy die casting machine auxiliary structure

Technical Field

The utility model relates to an aluminum alloy production facility technical field specifically is an aluminum alloy die casting machine auxiliary structure.

Background

The die casting machine is cooled off the shaping in the mould is penetrated to the molten metal hydraulic pressure to the mould under the pressure effect, can obtain the solid metal foundry goods after the die sinking, and the aluminum alloy die casting is the pressure casting machinery die casting machine who uses the good foundry goods mould of dress, and the heating is liquid aluminium or aluminum alloy and pours into the mold core, through die casting machine die-casting, casts out the aluminium part or the aluminum alloy part of the shape and the size of mould restriction, among the prior art: the aluminum alloy die casting machine suitability is poor, the mould of not unidimensional casting has restricted foundry goods shape and size, even some can rotate the structure of the different mold cores of transformation, can't provide the bearing support guarantee to the mould below during die-casting, the holistic stability of mould is not good, structural design is reasonable inadequately, it is single to have guide orientation stable structure or guide orientation stable structure, and then can't guarantee accurate die-casting location, die core of getting the difference with the rotation and coming the die-casting shaping structure and can not fine cooperation, consequently, the realization that can solve an aluminum alloy die casting machine auxiliary structure of this type of problem is imperative.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome current defect, the utility model provides an aluminum alloy die casting machine auxiliary structure, and easy operation realizes efficient aluminum alloy die-casting shaping, has alleviateed personnel's work burden, can be suitable for the shape and the size demand of casting out aluminium part or aluminium alloy part according to the gear and the different contact area of the tooth of circular mould board outer arc wall, provide the firm unit of multiple direction, guarantee accurate die-casting location, can effectively solve the problem in the background art.

To achieve the above object, the present invention provides an auxiliary structure of an aluminum alloy die casting machine, including a bottom plate, a conversion adjusting unit, a positioning unit, a guiding support unit, a guiding positioning unit and a guiding stabilizing unit, wherein the middle of the upper end of the bottom plate is provided with a planar bearing, the upper end of the planar bearing is provided with a circular die plate, the upper edge of the circular die plate is provided with positioning slots distributed at equal angles, the inner bottom of the positioning slots is provided with mold core slots with different sizes, the left side of the upper end of the bottom plate is provided with a L-shaped frame plate, the upper end of the L-shaped frame plate is provided with a hydraulic pump in a mounting hole, a hydraulic oil outlet of the hydraulic pump is communicated with an oil inlet of a telescopic column, the bottom end of the telescopic column is provided with a pressing plate, the pressing plate is provided with an insert block correspondingly inserted into the positioning slots, the conversion adjusting unit is arranged on the right side of the upper end of the bottom plate and connected with the circular die plate, the positioning unit is arranged on the right side of the bottom plate and fixedly connected with the top end of the conversion adjusting unit, the guiding support unit is arranged on the middle of the upper end of the bottom plate and fixedly connected with the bottom plate, the bottom plate is fixedly connected with a bottom plate of the circular die casting die plate, the bottom plate, the guide support unit is connected with a vertical die plate, the bottom plate, the vertical die casting machine is provided with a control unit, the vertical die, the vertical control unit, the vertical control panel, the vertical control unit is provided with a control panel, the vertical control.

Further, the conversion regulating unit includes motor, rotation axis, gear and tooth, the motor sets up in the mounting groove on bottom plate upper end right side, and the rotation axis passes through output shaft upper end fixed connection of shaft coupling and bottom plate, and the gear sets up in the middle part of rotation axis, and the tooth evenly sets up on the outer arc wall of circular mould board, and all is connected with gear engagement, and the P L C controller is connected to the motor electricity, realizes the quick rotatory conversion, can satisfy the die-casting of different shapes and size foundry goods.

Further, the positioning unit includes support frame plate and angle sensor, support frame plate sets up in the right side of bottom plate, and angle sensor sets up in the top bottom surface of support frame plate, and angle sensor's pivot passes through the top fixed connection of shaft coupling with the rotation axis, and P L C controller is connected to the equal electricity of angle sensor, detects rotation angle to be convenient for pinpoint.

Further, the direction support element is including supporting pivot, U-shaped board, recess gyro wheel and ring arc, the bottom of supporting the pivot is passed through the bearing and is rotated in the upper end center of bottom plate and be connected, supports the top of pivot and the bottom surface center fixed connection of circular mould board, and the U-shaped board evenly sets up in the upper end of bottom plate, and the pivot of recess gyro wheel both sides is passed through the bearing and is connected with the U-shaped inboard wall rotation that corresponds, and the ring arc sets up in the bottom surface center of circular mould board, and with recess gyro wheel sliding connection, provides the bottom powerful rotation support guarantee.

Further, the guiding and positioning unit comprises a rotating sliding shaft, a connecting column and a sliding ring, the two ends of the rotating sliding shaft are rotatably connected with the bottom surface of the transverse plate body of the L-shaped frame plate and the upper end center of the circular mold plate through bearings, the connecting column is arranged on the right side wall of the pressing plate, the sliding ring is arranged at the end of the outer side of the connecting column, the sliding ring is in sliding connection with the rotating sliding shaft, the rotating conversion adjustment is not influenced, and the effect of stable guiding and positioning can be achieved.

Further, the direction unit that stabilizes includes U-shaped rotor plate, gyro wheel and spout, the U-shaped rotor plate sets up on the left side wall of clamp plate, and the gyro wheel rotates through the commentaries on classics hole of pivot with the U-shaped rotor plate to be connected, and the spout sets up on the vertical plate body right wall of L shape frame plates, and gyro wheel and spout sliding connection play the effect of the firm location of the direction that reciprocates.

Further, still include reference column and constant head tank, the reference column sets up in the bottom surface left side of clamp plate, and the angle such as constant head tank sets up in the upper end edge of circular mould board, and the constant head tank corresponds the setting with the reference column, and reference column and constant head tank size are unanimous, play the guiding orientation when closing.

Compared with the prior art, the beneficial effects of the utility model are that: this aluminum alloy die casting machine auxiliary structure has following benefit:

1. the aluminum or aluminum alloy which is heated to be liquid is poured into the die core groove at the bottom end inside the positioning slot, the aluminum or aluminum alloy is regulated and controlled through the P L C controller, the hydraulic pump operates, the hydraulic oil output port drives the telescopic column to extend, the pressing plate is driven to move downwards, the insert blocks are inserted into the corresponding positioning slots, the die core grooves with different shapes and sizes are used for die-casting and molding, the operation is simple, efficient aluminum alloy die-casting and molding is achieved, the working load of personnel is reduced, the rotating number of the rotating shaft and the rotating number of the gear can be detected in real time through the motor operation, the rotating shaft and the gear are driven to rotate through the rotation of the output shaft, the uniformly distributed teeth are connected with the gear in a meshed mode, the rotating angle of the circular die plate is rapidly calculated under the rotating supporting effect of the plane bearing, the angle sensor on the bottom surface of the top end of the support frame plate detects the rotating number of the rotating shaft and the rotating number of the gear in real time, the detected information is timely presented to the P L C controller for integration and analysis, the rotating angle of the circular die plate is rapidly calculated according to the gear tooth ratio, and the aluminum alloy groove positioning slot with different sizes and the aluminum.

2. Because the bottom of supporting the pivot is passed through the bearing and is connected with the upper end center rotation in the bottom plate, the top of supporting the pivot and the bottom surface center fixed connection of circular mould board, ring arc and recess gyro wheel sliding connection both provide the below when die-casting and bear the weight of the support guarantee, satisfy normal circular mould board rotation demand again, guarantee the holistic stability of circular mould board.

3. In the pressing plate and the insert pressing and moving process, the idler wheel is connected with the rotating hole of the U-shaped rotating plate in a rotating mode through the rotating shaft, the idler wheel is connected with the sliding groove in a sliding mode, the guiding effect of up-and-down movement is achieved, accurate positioning die casting is achieved, meanwhile, the stability of the whole pressing plate and the insert is guaranteed, the sliding ring is connected with the rotating sliding shaft in a sliding mode, the guiding effect of up-and-down movement of the pressing plate and the insert is achieved, accurate positioning die casting is achieved, the two ends of the rotating sliding shaft are connected with the bottom surface of the transverse plate body of the L-shaped frame plate and the center of the upper end of the circular die plate in a rotating mode through the bearing, the normal rotation of the circular die plate is not affected, different die core forming is selected, the structural design is reasonable, a double guiding positioning stabilizing structure is.

Drawings

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

FIG. 2 is a schematic view of the internal cross-sectional plane structure of the present invention;

fig. 3 is an enlarged schematic view of the a position of the present invention.

In the figure, 1 a bottom plate, 2 a plane bearing, 3 a circular mould plate, 4 positioning slots, 5 a mould core slot, 6 a conversion adjusting unit, 61 a motor, 62 a rotating shaft, 63 a gear, 64 teeth, 7 a positioning unit, 71 a supporting frame plate, 72 an angle sensor, 8 a guiding and supporting unit, 81 a supporting rotating shaft, 82U-shaped plates, 83 groove rollers, 84 circular arc plates, 9L-shaped frame plates, 10 hydraulic pumps, 11 telescopic columns, 12 pressing plates, 13 inserting blocks, 14 a guiding and positioning unit, 141 a rotating sliding shaft, 142 connecting columns, 143 sliding rings, 15 a guiding and stabilizing unit, 151U-shaped rotating plates, 152 rollers, 153 sliding grooves, 16 displays, 17P L C controllers, 18 positioning columns and 19 positioning slots are arranged.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides the following technical solutions:

the embodiment I is an auxiliary structure of an aluminum alloy die casting machine, which comprises a bottom plate 1, a conversion adjusting unit 6, a positioning unit 7, a guide supporting unit 8, a guide positioning unit 14 and a guide stabilizing unit 15, a planar bearing 2 is arranged in the middle of the upper end of the bottom plate 1, a circular mold plate 3 is arranged at the upper end of the planar bearing 2, positioning slots 4 which are distributed at equal angles are arranged at the edge of the upper end of the circular mold plate 3, mold core grooves 5 which are different in size and shape are arranged at the bottom end inside the positioning slots 4, L-shaped frame plates 9 are arranged on the left side of the upper end of the bottom plate 1, a hydraulic pump 10 is arranged in an upper end mounting hole of the L-shaped frame plate 9, a hydraulic oil outlet of the hydraulic pump 10 is communicated with an oil inlet of a telescopic column 11, a pressing plate 12 is arranged at the bottom end of the telescopic column 11, an insert block 13 is correspondingly inserted into the positioning slots 4, an aluminum or aluminum alloy which is heated to be in a mold core groove 5 at the bottom inside the positioning slot 4, the hydraulic pump 10 is arranged in a rotating through a rotating and supporting unit 2, the bottom plate 2, the bottom end of the bottom plate when the bottom plate is connected with a display unit 2, a rotating center control unit 2, a display control unit 2, a vertical display control unit 2 is connected with a vertical display control panel 14, a vertical support plate 16 is connected with a vertical support plate 16, a vertical support plate 2, a vertical support plate 16, a vertical support plate 3, a bottom plate 2, a vertical support control panel 16 is arranged on a bottom plate 3, a bottom plate 2, a bottom plate 3, a bottom plate 2, a bottom plate connected with a bottom plate 2, a bottom plate 3, a bottom plate 2, a vertical support unit 2, a bottom plate 2, a vertical support unit 2, a bottom plate 2, a vertical support unit 2, a bottom plate 2, a vertical support unit 2 is arranged on a bottom support unit 2, a vertical support unit 2, a bottom support unit.

Wherein: still include reference column 18 and constant head tank 19, when reference column 18 and constant head tank 19 were closed, the inserted block 13 inserted in the location slot 4 that corresponds, played the effect of location when closed, and reference column 18 sets up in the bottom surface left side of clamp plate 12, and the angle such as constant head tank 19 sets up in the upper end edge of circular mould board 3, and constant head tank 19 corresponds the setting with reference column 18, and reference column 18 and constant head tank 19 size are unanimous.

Example two:

the difference between this embodiment and the first embodiment is:

in this embodiment, the conversion adjusting unit 6 includes a motor 61, a rotating shaft 62, a gear 63 and teeth 64, the motor 61 is disposed in the mounting groove on the right side of the upper end of the bottom plate 1, the rotating shaft 62 is fixedly connected to the upper end of the output shaft of the bottom plate 1 through a coupler, the gear 63 is disposed in the middle of the rotating shaft 62, the teeth 64 are uniformly disposed on the outer arc wall of the circular mold plate 3 and are all engaged with the gear 63, the positioning unit 7 includes a support frame plate 71 and an angle sensor 72, the support frame plate 71 is disposed on the right side of the bottom plate 1, the angle sensor 72 is disposed on the bottom surface of the top end of the support frame plate 71, the rotating shaft of the angle sensor 72 is fixedly connected to the top end of the rotating shaft 62 through a coupler, the motor 61 is electrically connected to.

Specifically, set up like this, can be according to the shape and the size demand that will cast out aluminium part or aluminium alloy part, through motor 61 operation, the output shaft rotates and drives rotation axis 62 and gear 63 rotatory, because evenly distributed's tooth 64 all is connected with the meshing of gear 63, under the rotation support effect of plane bearing 2, it is rotatory to realize circular mould board 3, the angle sensor 72 of support frame plate 71 top bottom surface detects the number of revolutions of rotation axis 62 and gear 63 in real time, in time present the number of revolutions that delivers to P L C controller 17 integration analysis with the information that detects, according to the tooth ratio of gear 63 and tooth 64, calculate the rotation angle of circular mould board 3 fast, and then guarantee to be equipped with the accurate counterpoint of mould core groove 5 positioning slot 4 and inserted block 13 that the size differs, thereby can be suitable for the shape and the size demand of cast out aluminium part or aluminium alloy part according to the place of the different contacts of the tooth 64 of regulation gear 63 and the outer arc wall of circular mould board 3.

Example three:

the difference between this embodiment and the first embodiment is:

in this embodiment, the guiding and positioning unit 14 includes a rotating sliding shaft 141, a connecting column 142 and a sliding ring 143, two ends of the rotating sliding shaft 141 are rotatably connected to the bottom surface of the transverse plate body of the L-shaped frame plate 9 and the center of the upper end of the circular mold plate 3 through bearings, the connecting column 142 is disposed on the right side wall of the pressing plate 12, the sliding ring 143 is disposed at the outer end of the connecting column 142, the sliding ring 143 is slidably connected to the rotating sliding shaft 141, the guiding and stabilizing unit 15 includes a U-shaped rotating plate 151, a roller 152 and a sliding groove 153, the U-shaped rotating plate 151 is disposed on the left side wall of the pressing plate 12, the roller 152 is rotatably connected to the rotating hole of the U-shaped rotating plate 151 through a rotating shaft, the sliding groove 153 is disposed on the right.

Specifically, set up like this, in the in-process pushes down and shifts up at clamp plate 12 and inserted block 13, because gyro wheel 152 rotates through the commentaries on classics hole of pivot with U-shaped rotor plate 151 to be connected, gyro wheel 152 and spout 153 sliding connection, play the guide effect that reciprocates, realize accurate positioning die-casting, guarantee the holistic stability of clamp plate 12 and inserted block 13 simultaneously again, sliding ring 143 and rotation slide shaft 141 sliding connection, also play the guide effect that clamp plate 12 and inserted block 13 reciprocated, realize accurate positioning die-casting, because the both ends of rotation slide shaft 141 are all rotated through bearing and L shape frame plate 9's horizontal plate body bottom surface and circular mould board 3's upper end center and are connected, do not influence circular mould board 3 normal rotation and select different mold core shaping, personnel's work burden has been lightened.

When the die-casting device is used, aluminum or aluminum alloy heated to be liquid is poured into the die core groove 5 at the bottom end inside the positioning slot 4, the adjustment and control are performed through the P L C controller 17, the hydraulic pump 10 operates, the hydraulic oil output port drives the telescopic column 11 to extend, the pressing plate 12 is driven to move downwards, the inserting block 13 is inserted into the corresponding positioning slot 4, the positioning column 18 is completely inserted into the positioning slot 19 at the moment, so that the die-casting molding is performed by means of the die core groove 5 with different shapes and sizes, the rotating shaft 62 and the gear 63 are driven to rotate through the operation of the motor 61 according to the shape and size requirements of an aluminum part or an aluminum alloy part to be cast, the uniformly distributed teeth 64 are meshed with the gear 63, under the rotating supporting action of the plane bearing 2, the rotating circular die plate 3 is rotated, the rotating angle sensor 72 on the bottom surface of the top end of the supporting frame plate 71 detects the rotating shaft 62 and the gear 63 in real time, the detection information is presented to the P L C controller 17 for integrated analysis, the detection, the rotation angle of the detection information is quickly calculated according to the gear ratio of the gear 63 and the gear 3, the gear 4, the gear 63 is ensured, the rotating shaft 4 and the rotating shaft 13, the rotating circular die-casting mold plate is connected with the rotating plate, the rotating plate is connected with the rotating plate through the rotating bearing plate, the rotating shaft supporting plate, the rotating shaft 13, the rotating plate is also ensured, the rotating plate, the rotating shaft supporting plate, the rotating plate 3, the rotating plate is connected with the rotating plate, the rotating plate 2, the rotating plate 3, the rotating plate is connected with the rotating plate, the rotating plate when the rotating plate is connected with the rotating plate, the rotating plate 3, the rotating plate is connected with the rotating plate.

It should be noted that the specific model of the P L C controller 17 disclosed in this embodiment is siemens S7-200, the angle sensor 72 may be a tin-free angle sensor with a high accuracy of AT216T, the P L C controller 17 controls the motor 61, the hydraulic pump 10 and the display 16 to operate according to a method commonly used in the prior art, and the angle sensor 72, the motor 61, the hydraulic pump 10 and the display 16 are all components commonly used in die casting equipment in the prior art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an aluminum alloy die casting machine auxiliary structure, its characterized in that includes bottom plate (1), conversion regulating unit (6), positioning unit (7), direction support unit (8), direction positioning unit (14) and the firm unit (15) of direction, the upper end middle part of bottom plate (1) is equipped with flat bearing (2), the upper end of flat bearing (2) is equipped with circular mould board (3), the upper end edge of circular mould board (3) is equipped with positioning slot (4) of equal angular distribution, the inside bottom of positioning slot (4) is equipped with die core groove (5) that the shape is not of uniform size, the upper end left side of bottom plate (1) is equipped with L shape frame plate (9), be equipped with hydraulic pump (10) in the upper end mounting hole of L shape frame plate (9), the hydraulic oil delivery outlet of hydraulic pump (10) and the oil inlet intercommunication of flexible post (11), the bottom of flexible post (11) is equipped with clamp plate (12), the bottom of clamp plate (12) is equipped with inserted block (13), inserted block (13) corresponds grafting with positioning slot (4), conversion regulating unit (6) sets up in the right side of bottom plate (1) and the upper end of bottom plate (16) and the bottom plate (16) is connected with the circular mould control unit (16) of the bottom plate (16) and the top of the vertical control unit (16) of the bottom plate (16) is connected with the bottom plate (16) of the vertical control unit (16) of the bottom plate (16) is connected, the bottom plate (16) is connected to the bottom plate (16) of the vertical control unit (3) and the bottom plate (16, the bottom plate (16) of the bottom plate (3) of the top of the bottom plate (16) is connected with the bottom plate (3) of the top of the bottom plate (3) of the bottom plate (6) is connected of the vertical control unit (3) is connected of the bottom.

2. The auxiliary structure of the aluminum alloy die casting machine as claimed in claim 1, wherein the conversion adjusting unit (6) comprises a motor (61), a rotating shaft (62), a gear (63) and teeth (64), the motor (61) is arranged in a mounting groove on the right side of the upper end of the bottom plate (1), the rotating shaft (62) is fixedly connected with the upper end of an output shaft of the bottom plate (1) through a coupler, the gear (63) is arranged in the middle of the rotating shaft (62), the teeth (64) are uniformly arranged on the outer arc wall of the circular die plate (3) and are meshed with the gear (63), and the motor (61) is electrically connected with the P L C controller (17).

3. The auxiliary structure of the aluminum alloy die casting machine according to claim 2, wherein the positioning unit (7) comprises a support frame plate (71) and angle sensors (72), the support frame plate (71) is arranged on the right side of the bottom plate (1), the angle sensors (72) are arranged on the bottom surfaces of the top ends of the support frame plate (71), the rotating shafts of the angle sensors (72) are fixedly connected with the top ends of the rotating shafts (62) through shaft couplings, and the angle sensors (72) are all electrically connected with the P L C controller (17).

4. The aluminum alloy die casting machine auxiliary structure of claim 1, wherein: the direction support unit (8) is including supporting pivot (81), U-shaped board (82), recess gyro wheel (83) and ring arc (84), the bottom of supporting pivot (81) is passed through the bearing and is rotated in the upper end center of bottom plate (1) and be connected, supports the top of pivot (81) and the central fixed connection in bottom surface of circular mould board (3), U-shaped board (82) evenly set up in the upper end of bottom plate (1), the pivot of recess gyro wheel (83) both sides is passed through the bearing and is connected with the rotation of the U-shaped board (82) inner wall that corresponds, ring arc (84) set up in the bottom surface center of circular mould board (3), and with recess gyro wheel (83) sliding connection.

5. The auxiliary structure of the aluminum alloy die casting machine as claimed in claim 1, wherein the guiding and positioning unit (14) comprises a rotating sliding shaft (141), a connecting column (142) and a sliding ring (143), two ends of the rotating sliding shaft (141) are rotatably connected with the bottom surface of the transverse plate body of the L-shaped frame plate (9) and the center of the upper end of the circular die plate (3) through bearings, the connecting column (142) is arranged on the right side wall of the pressing plate (12), the sliding ring (143) is arranged at the end of the outer side of the connecting column (142), and the sliding ring (143) is slidably connected with the rotating sliding shaft (141).

6. The auxiliary structure of the aluminum alloy die-casting machine as claimed in claim 1, wherein the guiding and stabilizing unit (15) comprises a U-shaped rotating plate (151), a roller (152) and a chute (153), the U-shaped rotating plate (151) is arranged on the left side wall of the pressing plate (12), the roller (152) is rotatably connected with a rotating hole of the U-shaped rotating plate (151) through a rotating shaft, the chute (153) is arranged on the right wall of a vertical plate body of the L-shaped frame plate (9), and the roller (152) is slidably connected with the chute (153).

7. The aluminum alloy die casting machine auxiliary structure of claim 1, wherein: still include reference column (18) and constant head tank (19), reference column (18) set up in the bottom surface left side of clamp plate (12), and constant angle such as constant head tank (19) sets up in the upper end edge of circular mould board (3), and constant head tank (19) correspond the setting with reference column (18), and reference column (18) and constant head tank (19) size are unanimous.