DE112014005850B4 - Sand addition dosing mechanism and sand addition dosing method for a core shooter - Google Patents

Abstract

Sand addition dosing mechanism for a core shooter, said core shooter having a lower machine frame (11) and an upper machine frame (12) located above said lower machine frame, a movable shooting head device (2) being provided on said lower machine frame, said Sand metering mechanism comprising a sand storage tank (31) and a first sand addition valve (32), said sand storage tank (31) being mounted on said upper machine frame (12), said first sand addition valve (32) being at the sand discharge port of said sand storage tank (31), characterized in that said first sand addition valve (32) is an adjustable valve, said sand addition metering mechanism referred to further comprising a metering tank (34), said metering tank (34) connected to said upper machine frame (12) via a weighing member (35), the sand input port of said metering tank (34) being connected to the sand output port of said sand storage tank (31) via said first sand adding valve (32), wherein at a second sand addition valve (36) is provided at the sand discharge opening of said dosing tank (34), wherein when the gun head device (2) is in the sand addition position, said gun head device (2) is connected to the sand discharge port via said second sand addition valve (36). of said metering tank (34);wherein the molding sand in said metering tank (34) has a set weight W, the valve opening of said first sand addition valve (32) having a maximum diameter DN; andwherein the sand addition metering mechanism further comprises an automatic control device arranged to control the sand addition metering mechanism as follows: (1) closing said second sand addition valve (36), starting a vibratory electric motor (33) of said sand storage tank (31 ) and opening the first sand addition valve (32), regulating the valve opening of said first sand addition valve (32) to the maximum sand discharge diameter DN, adding molding sand to said dosing tank (34), real time weighing the weight of the sand in said dosing tank ( 34) molding sand in said weighing member (35); (2) when the weight of molding sand in said metering tank (34) reaches M1, regulating the valve opening of said first sand addition valve (32) to DN1, where 1/2M ≤ M1 < 2/3M and 2/3DN < DN1 ≤ 4/5DN; (3) when the weight of molding sand in said metering tank (34) reaches M2, regulating the valve opening of said first sand addition valve (32) to DN2 , where 2/3M ≤ M2 < 3/4M and 1/3DN < DN2 ≤ 2/3DN;(4) when the weight of the molding sand in said dosing tank (34) reaches M3, adjusting the valve opening of said first sand addition- valve (32) to DN3, where 3/4M ≤ M3 < 5/6M and 1/6DN < DN2 ≤ 1/3DN;(5) upon reaching the set M of the weight of the molding sand in said dosing tank (34), closing said first sand adding valve (32) and stopping operation of the vibrating electric motor (33) of said sand storage tank (31);(6) opening said second sand adding valve (36) and adding molding sand to said shooting head device (2).

Description

technical field

The present invention relates to a sand addition metering mechanism, more particularly to a sand addition metering mechanism and a sand addition metering method for a core shooter.

State of the art

In the course of manufacturing sand cores, regarding complicated sand cores, there are strict requirements for the sand shooting conditions of the facility. The operating state of the sand blasting facility must be kept basically the same, the factors influencing the sand blasting are mainly the sand blasting pressure and the sand storage in the sand shooting head. When operating the core shooter, there are generally relatively small fluctuations in the sand shooting pressure, so that the amount of sand in the sand shooting head of the system should always be the same.

In prior art core shooters, the sand addition metering mechanism mainly uses an ultrasonic or laser distance measuring switch to measure the sand storage height in the sand shooter head. When the switch senses that the sand storage level in the sand gun falls below a set level, the ordinary butterfly valve or shut-off valve of the sand storage tank opens and sand addition to the sand gun begins. When the sand storage height reaches the set height, the ordinary butterfly valve or shut-off valve of the sand storage tank will close, and the sand addition to the sand shooting head will stop.

1. 1. Bei der Sandzugabe von dem Sandspeicherbehälter an den Sandschießkopf weist die Ansammlung des Formsands in dem Sandschießkopf keine Regelhaftigkeit auf und die Position des Ultraschall- oder Laser-Abstandsmessschalters kann keine exakte Wiedergabe der tatsächlichen Sandansammlungshöhe in den Sandschießkopf bieten, was dazu führt, dass bei identischer Position des Abstandsmessschalters unterschiedliche Sandspeichermengen in dem Sandschießkopf vorliegen.
2. 2. Nach der Messung der Positionserreichung durch den Abstandsmessschalter schließt das gewöhnliche Schmetterlingsventil oder Absperrventil des Sandspeicherbehälters und während des Schließens erfolgt die weitere Zugabe eines Teils des Formsands durch den Sandspeicherbehälter an den Sandschießkopf. Wegen Faktoren wie Sandspeichermenge des Sandspeicherbehälters, Schließdauer des Schmetterlingsventils oder Absperrventils usw. kommt es zu teilweise Gewichtsunterschieden hinsichtlich des Formsands.

The measurement of sand addition height in the sand shooter head by switch in prior art core shooters has the following main shortcomings:

1. 1. When adding sand from the sand storage tank to the sand gun, the accumulation of the molding sand in the sand gun has no regularity, and the position of the ultrasonic or laser distance measuring switch cannot provide an accurate representation of the actual sand accumulation height into the sand gun, resulting in at identical position of the distance measuring switch different amounts of sand storage are present in the sand shooting head.
2. 2. After measuring the position attainment by the distance measuring switch, the ordinary butterfly valve or shut-off valve of the sand storage tank closes, and during the closing, further addition of a part of the molding sand through the sand storage tank to the sand shooting head. Due to factors such as the sand storage amount of the sand storage tank, the closing time of the butterfly valve or shut-off valve, etc., there will be some difference in the weight of the molding sand.

Therefore, in the technique of adding sand to the sand gun using an ultrasonic or laser distance measuring switch for the dosage addition of sand is by no means very precise.

content of the invention

The object of the present invention is to provide a sand addition metering mechanism to increase the sand addition precision for the core shooter and reduce the scrap rate of the sand cores.

In order to achieve the stated objective, the present invention provides the following technical conception: Sand addition dosing mechanism for a core shooter, said core shooter having a lower machine frame and an upper machine frame located above said lower machine frame, said lower machine frame having a movable shooting head device is provided, said sand metering mechanism comprising a sand storage tank and a first sand addition valve, said sand storage tank being mounted on said upper machine frame, said first sand addition valve being provided at the sand discharge opening of said sand storage tank, characterized in that it said first sand addition valve is an adjustable valve, said sand addition metering mechanism referred to further comprising a metering tank, said metering tank being connected to said upper machine frame via a rocker member, the sand input port of said metering tank being connected via said first sand addition valve is connected to the sand discharge port of said sand storage tank, a second sand addition valve being provided at the sand discharge port of said metering tank, wherein when the shooting head device is in the sand adding position, said shooting head device is connected to the sand discharge port via said second sand addition valve of said dosing container.

Depending on when the set weight of the molding sand in the dosing container has been reached, it is determined whether the addition of sand is to be terminated. According to the weight of the molding sand in the metering tank measured by the weighing element, the degree of opening of the valve opening of the first sand adding valve is continuously regulated, so as to ensure that in the process of closing the valve opening of the first sand adding valve, the total amount of molding sand is not affected.

Said technical concept provides that said first sand addition valve is a pneumatic valve and said weighing element is an electronic scale or a weight sensor, said sand addition dosing mechanism also being an automatic control device wherein said automatic control device comprises a control device and a pneumatic valve drive device, said weighing element being connected to the input end of said control device, said pneumatic valve being connected to the output end of said control device by said pneumatic valve drive device connected is.

Said technical concept provides that said first sand addition valve is an electromagnetic valve and said weighing element is an electronic scale or a weight sensor, said sand addition dosing mechanism also being an automatic control device said automatic control device comprising a control device and an electromagnetic valve driving device, said weighing element being connected to the input end of said control device, said electromagnetic valve being connected through said electromagnetic valve driving device to the output end of said control device connected is.

1. (1) Schließen des genannten zweiten Sandzugabe-Ventils, Starten des Schwingungs-Elektromotors des genannten Sandspeicherbehälters und Öffnen des ersten Sandzugabe-Ventils, Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf den Maximalen Sandausgabedurchmesser DN, Zugabe von Formsand an den genannten Dosierungsbehälter, Echtzeitwiegen des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes durch das Wiegeelement;
2. (2) Bei Erreichen von M1 des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf DN1, wobei 1/2M ≤ M1 < 2/3M und 2/3DN < DN1 ≤ 4/5DN ist;
3. (3) Bei Erreichen von M2 des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf DN2, wobei 2/3M ≤ M2 < 3/4M und 1/3DN < DN2 ≤ 2/3DN ist;
4. (4) Bei Erreichen von M3 des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf DN3, wobei 3/4M ≤ M3 < 5/6M und 1/6DN < DN2 ≤ 1/3DN ist;
5. (5) Bei Erreichen des eingestellten M des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes Schließen des genannten ersten Sandzugabe-Ventils und Betriebsstopp des Schwingungs-Elektromotors des genannten Sandspeicherbehälters;
6. (6) Öffnen des genannten zweiten Sandzugabe-Ventils und Zugabe von Formsand an die genannte Schießkopfvorrichtung.

The present invention also provides another technical conception: sand addition metering method for a core shooter using the sand addition metering mechanism according to claim 1, wherein the molding sand in said metering tank has a set weight W, the valve opening of said first sand addition valve has a maximum diameter DN, the method comprising the following steps:

1. (1) Closing said second sand addition valve, starting the vibratory electric motor of said sand storage tank and opening the first sand addition valve, regulating the valve opening of said first sand addition valve to the Maximum Sand Discharge Diameter DN, adding molding sand to said metering tank, real-time weighing of the weight of the molding sand in said metering tank by the weighing member;
2. (2) upon reaching M1 of the weight of the molding sand in said metering tank, regulating the valve opening of said first sand adding valve to DN1, where 1/2M ≤ M1 < 2/3M and 2/3DN < DN1 ≤ 4/5DN;
3. (3) upon reaching M2 of the weight of the molding sand in said metering tank, regulating the valve opening of said first sand adding valve to DN2, where 2/3M ≤ M2 < 3/4M and 1/3DN < DN2 ≤ 2/3DN;
4. (4) when the weight of molding sand in said metering tank reaches M3, regulating the valve opening of said first sand adding valve to DN3, where 3/4M ≤ M3 < 5/6M and 1/6DN < DN2 ≤ 1/3DN;
5. (5) when the weight of the molding sand in said metering tank reaches the set M, closing said first sand addition valve and stopping the operation of the vibratory electric motor of said sand storage tank;
6. (6) Opening said second sand addition valve and addition of molding sand to said gun head device.

1. (1) Der Sandspeicherbehälter nimmt Wiegen und Dosierung des in die Sandschießkopfvorrichtung eingebrachten Formsandes vor, so dass keine Beeinträchtigung durch die Gestalt der Ansammlung des Formsandes besteht.
2. (2) Durch das Sandzugabe-Gewicht und die Durchmessergröße der Ventilöffnung des ersten Sandzugabe-Ventils werden entsprechend zusammenhängende Rückmeldungsinformationen generiert, wobei in der späteren Phase der Sandzugabe allmähliches Schließen des ersten Sandzugabe-Ventils erfolgt, so dass das Sandzugabe-Gewicht eine Verringerung der Beeinträchtigung durch Faktoren während des Ventilschließens bewirkt.

Compared to the prior art, the present invention offers the following advantages:

1. (1) The sand storage tank weighs and doses the molding sand charged into the sand gun device so that there is no interference from the shape of the accumulation of the molding sand.
2. (2) By the sand addition weight and the diameter size of the valve opening of the first sand addition valve, correspondingly related feedback information is generated, with the later stage of sand addition gradually closing the first sand addition valve, so that the sand addition weight reduces the impact interference caused by factors during valve closing.

character list

• 1 Fig. 12 shows an illustration of the sand addition dosing mechanism for a core shooter according to the present invention.

Reference List

11

Lower machine frame;

12

Upper machine frame;

2

shooting head device;

31

sand storage tanks;

32

First sand addition valve;

33

vibration electric motor;

34

dosing container;

35

weighing element;

36

Second sand addition valve.

embodiments

A further description of the present invention is given below with reference to the attached figures.

First embodiment

As in 1 shown is a sand addition metering mechanism for a core shooter, said core shooter having a lower machine frame 11 and an upper machine frame 12 located above said lower machine frame, said lower machine frame 11 being provided with a movable shooting head device 2, the said sand metering mechanism comprises a sand storage tank 31, a first sand addition valve 32 and a vibration electric motor 33, said sand storage tank 31 being mounted on said upper machine frame 12, said first sand addition valve 32 being provided at the sand discharge opening of said sand storage tank 31 and the vibratory electric motor 33 is provided on the outer wall of the sand storage tank 31, said first sand addition valve 32 being an adjustable valve, the sand addition metering mechanism referred to above further comprising a metering tank 34, said metering tank 34 is connected to said upper machine frame 12 via a weighing member 35, the sand input port of said metering tank 34 being connected to the sand output port of said sand storage tank 31 through said first sand metering valve 32, at the sand output port of said metering tank 34 a second sand metering port valve 36, with the gun head device 2 being in the sand adding position, said gun head device 2 being connected to the sand discharge port of said metering tank 34 via said second sand metering valve 36.

Said first sand addition valve 32 is a pneumatic valve and said weighing element 35 is an electronic scale or a weight sensor, said sand addition dosing mechanism further comprising an automatic control device, said automatic control device a controller and a pneumatic valve driver, said weighing element being connected to the input end of said controller, said pneumatic valve being connected to the output end of said controller through said pneumatic valve driver.

Here, the weighing element 35 can feed back signals to the first sand adding valve 32 to regulate the opening diameter of the first sand adding valve 32 . The second sand addition valve 36 is an ordinary pneumatic valve.

1. (1) Schließen des genannten zweiten Sandzugabe-Ventils 36, Starten des Schwingungs-Elektromotors 33 des genannten Sandspeicherbehälters 31 und Öffnen des ersten Sandzugabe-Ventils 32 durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils , Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils 32 auf den maximalen Sandausgabedurchmesser DN, Zugabe von Formsand an den genannten Dosierungsbehälter 34, Echtzeitwiegen des Gewichts des in dem genannten Dosierungsbehälter 34 befindlichen Formsandes durch das Wiegeelement und Übermittlung des Wiegeergebnisses an das genannte Steuerungsgerät;
2. (2) Bei Erreichen von 1/2M des durch das Wiegeelement 35 gemessenen Gewichts des in dem genannten Dosierungsbehälter 34 befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils 32 auf 4/5DN;
3. (3) Bei Erreichen von 2/3M des durch das Wiegeelement 35 gemessenen Gewichts des in dem genannten Dosierungsbehälter 34 befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils 32 auf 2/3DN;
4. (4) Bei Erreichen von 3/4M des durch das Wiegeelement 35 gemessenen Gewichts des in dem genannten Dosierungsbehälter 34 befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils 32 auf 1/3DN;
5. (5) Bei Erreichen von M des durch das Wiegeelement 35 gemessenen Gewichts des in dem genannten Dosierungsbehälter 34 befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils das Schließen des genannten ersten Sandzugabe-Ventils 32 und Betriebsstopp des Schwingungs-Elektromotors 33 des Sandspeicherbehälters 31;
6. (6) Öffnen des genannten zweiten Sandzugabe-Ventils 36 und Zugabe von Formsand an die genannte Schießkopfvorrichtung 2.

A description will now be given of a sand addition metering method for a core shooter using said sand addition metering mechanism, wherein the molding sand in said metering tank 34 has a set weight W, and the valve opening of said first sand addition valve 32 has a maximum diameter DN , the method comprising the following steps:

1. (1) Closing said second sand addition valve 36, starting vibrating electric motor 33 of said sand storage tank 31 and opening first sand addition valve 32 by said controller and pneumatic valve driving device 12, regulating the valve opening of said first sand addition valve 32 to the maximum sand discharge diameter DN, adding molding sand to said dosing tank 34, real time weighing the weight of the molding sand in said dosing tank 34 by the weighing member and transmitting the weighing result to said control device;
2. (2) When the weight of the molding sand in said metering tank 34 reaches 1/2M of the weight measured by the weighing member 35, the valve opening of said first sand adding valve 32 is regulated to 4/5DN by said controller and pneumatic valve driving device ;
3. (3) When the weight of the molding sand in said metering tank 34 reaches 2/3M measured by the weighing member 35, the valve opening of said first sand adding valve 32 is regulated to 2/3DN by said controller and pneumatic valve driving device ;
4. (4) When the weight of the molding sand in said metering tank 34 reaches 3/4M of the weight measured by the weighing member 35, the valve opening of said first sand adding valve 32 is regulated to 1/3DN by said controller and pneumatic valve driving device ;
5. (5) Upon reaching M of the weight of the molding sand in said dosing tank 34 measured by the weighing element 35, said control device and pneumatic valve drive device close said first sand addition valve 32 and stop the operation of the vibrating electric motor 33 of the sand storage tank 31;
6. (6) Opening said second sand addition valve 36 and addition of molding sand to said gun head device 2.

Second embodiment

The conception is basically the same as in the first embodiment. The difference is that said first sand addition valve is an electromagnetic valve and said weighing element is a weight sensor. Said automatic control device comprises a control device and a driving device for the first electromagnetic valve, a driving device for the second electromagnetic valve, and an electric motor driving device, wherein the weight sensor is connected to the input end of said control device, said first sand adding valve being controlled by the driving device of the first electromagnetic valve is connected to the output end of said control device, said second sand adding valve is connected to the output end of said control device through the driving device of the second electromagnetic valve, said vibrating electric motor is connected by said electric motor driving device with connected to the output end of said control device.

1. (1) Schließen des genannten zweiten Sandzugabe-Ventils, Starten des Schwingungs-Elektromotors und Öffnen des ersten Sandzugabe-Ventils durch das genannte Steuerungsgerät, die Elektromotor-Antriebsvorrichtung und die Antriebsvorrichtung des ersten elektromagnetischen Ventils, Regulierung des ersten Sandzugabe-Ventils auf den maximalen Sandausgabedurchmesser DN, Zugabe von Formsand an den genannten Dosierungsbehälter, Echtzeitwiegen des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes durch den Gewichtssensor und Übermittlung des Wiegeergebnisses an das genannte Steuerungsgerät;
2. (2) Bei Erreichen von 13/24M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des ersten elektromagnetischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 23/30DN;
3. (3) Bei Erreichen von 25/36M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des ersten elektromagnetischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 5/9DN;
4. (4) Bei Erreichen von 28/36M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des ersten elektromagnetischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 5/18DN;
5. (5) Bei Erreichen von M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des ersten elektromagnetischen Ventils das Schließen des genannten ersten Sandzugabe-Ventils und Betriebsstopp des Schwingungs-Elektromotors des Sandspeicherbehälters;
6. (6) Öffnen des genannten zweiten Sandzugabe-Ventils durch das genannte Steuerungsgerät und die Antriebsvorrichtung des zweiten elektromagnetischen Ventils und Zugabe von Formsand an die genannte Schießkopfvorrichtung.

The following is a description of a sand addition metering method for a core shooter using said sand addition metering mechanism, the method comprising the following steps:

1. (1) Closing said second sand adding valve, starting the vibration electric motor and opening the first sand adding valve by said controller, electric motor driving device and first electromagnetic valve driving device, regulating the first sand adding valve to the maximum sand discharge diameter DN adding molding sand to said metering tank, weighing the weight of molding sand in said metering tank in real time by the weight sensor and transmitting the weighing result to said control device;
2. (2) when the weight of the molding sand in said metering tank reaches 13/24M measured by the weighing element, said control device and the driving device of the first electromagnetic valve regulate the valve opening of said first sand adding valve to 23/30DN;
3. (3) When the weight of the molding sand in said metering tank reaches 25/36M measured by the weighing element, said control device and the driving device of the first electromagnetic valve regulate the valve opening of said first sand adding valve to 5/9DN;
4. (4) When the weight of the molding sand in said metering tank reaches 28/36M measured by the weighing member, said control device and the driving device of the first electromagnetic valve regulate the valve opening of said first sand adding valve to 5/18DN;
5. (5) Upon reaching M of the weight of the molding sand in said metering tank measured by the weighing member, said control device and driving means close the first electromagnetic valve said first sand addition valve and operation stop of the vibrating electric motor of the sand storage tank;
6. (6) Opening said second sand adding valve by said controller and second electromagnetic valve driving device and adding molding sand to said shooting head device.

Third embodiment

1. (1) Schließen des genannten zweiten Sandzugabe-Ventils, Starten des Schwingungs-Elektromotors des Sandspeicherbehälters und Öffnen des ersten Sandzugabe-Ventils durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils, Regulierung der Ventilöffnung des ersten Sandzugabe-Ventils auf den maximalen Sandausgabedurchmesser DN, Zugabe von Formsand an den genannten Dosierungsbehälter, Echtzeitwiegen des Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes durch das Wiegeelement und Übermittlung des Wiegeergebnisses an das genannte Steuerungsgerät;
2. (2) Bei Erreichen von 15/24M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 21/30DN;
3. (3) Bei Erreichen von 27/36M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 4/9DN;
4. (4) Bei Erreichen von 29/36M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils die Regulierung der Ventilöffnung des genannten ersten Sandzugabe-Ventils auf 4/18DN;
5. (5) Bei Erreichen von M des durch das Wiegeelement gemessenen Gewichts des in dem genannten Dosierungsbehälter befindlichen Formsandes erfolgt durch das genannte Steuerungsgerät und die Antriebsvorrichtung des pneumatischen Ventils das Schließen des genannten ersten Sandzugabe-Ventils und Betriebsstopp des Schwingungs-Elektromotors des Sandspeicherbehälters;
6. (6) Öffnen des genannten zweiten Sandzugabe-Ventils und Zugabe von Formsand an die genannte Schießkopfvorrichtung.

The conception is basically the same as in the first embodiment. The difference is that the procedure includes the following steps:

1. (1) Closing said second sand addition valve, starting the vibration electric motor of the sand storage tank and opening the first sand addition valve by said controller and pneumatic valve driving device, regulating the valve opening of the first sand addition valve to the maximum sand discharge diameter DN, adding molding sand to said metering tank, weighing the weight of molding sand in said metering tank by the weighing member in real time, and transmitting the weighing result to said controller;
2. (2) When the weight of the molding sand in said metering tank reaches 15/24M measured by the weighing member, said controller and pneumatic valve driving device regulate the valve opening of said first sand adding valve to 21/30DN;
3. (3) When the weight of the molding sand in said metering tank reaches 27/36M measured by the weighing element, said controller and pneumatic valve driving device regulate the valve opening of said first sand adding valve to 4/9DN;
4. (4) When the weight of the molding sand in said metering tank reaches 29/36M measured by the weighing element, said controller and pneumatic valve driving device regulate the valve opening of said first sand adding valve to 4/18DN;
5. (5) When the weight of the molding sand in said metering tank reaches M measured by the weighing element, said control device and pneumatic valve driving device close said first sand addition valve and stop the operation of the vibration electric motor of the sand storage tank;
6. (6) Opening said second sand addition valve and addition of molding sand to said gun head device.

Claims (4)

Sand addition dosing mechanism for a core shooter, said core shooter having a lower machine frame (11) and an upper machine frame (12) located above said lower machine frame, a movable shooting head device (2) being provided on said lower machine frame, said Sand metering mechanism comprising a sand storage tank (31) and a first sand addition valve (32), said sand storage tank (31) being mounted on said upper machine frame (12), said first sand addition valve (32) being at the sand discharge port of said sand storage tank (31), characterized in that said first sand addition valve (32) is an adjustable valve, the aforesaid sand addition metering mechanism also comprising a metering tank (34), said metering tank (34 ) is connected to said upper machine frame (12) via a weighing member (35), the sand input port of said metering tank (34) being connected to the sand output port of said sand storage tank (31) via said first sand addition valve (32), wherein a second sand addition valve (36) is provided at the sand discharge opening of said dosing tank (34), wherein when the gun head device (2) is in the sand addition position, said gun head device (2) is connected via said second sand addition valve (36) to the sand discharge port of said dosing tank (34); the molding sand in said metering tank (34) having a set weight W, the valve opening of said first sand addition valve (32) having a maximum diameter DN; and wherein the sand addition metering mechanism further comprises an automatic control device operable to control the sand addition addition metering mechanism is arranged as follows: (1) closing said second sand addition valve (36), starting a vibration electric motor (33) of said sand storage tank (31) and opening the first sand addition valve (32), regulating valve opening said first sand adding valve (32) to the maximum sand discharge diameter DN, adding molding sand to said metering tank (34), real time weighing the weight of molding sand in said metering tank (34) by the weighing member (35); (2) When the weight of molding sand in said metering tank (34) reaches M1, regulate the valve opening of said first sand adding valve (32) to DN1, where 1/2M ≤ M1 < 2/3M and 2/3DN < DN1 ≤ 4/5DN; (3) When the weight of molding sand in said metering tank (34) reaches M2, regulate the valve opening of said first sand adding valve (32) to DN2, where 2/3M ≤ M2 < 3/4M and 1/3DN < DN2 ≤ 2/3DN; (4) When the weight of molding sand in said metering tank (34) reaches M3, regulate the valve opening of said first sand adding valve (32) to DN3, where 3/4M ≤ M3 < 5/6M and 1/6DN < DN2 ≤ 1/3DN; (5) when the weight of the molding sand in said metering tank (34) reaches the set M, closing said first sand adding valve (32) and stopping the operation of the vibrating electric motor (33) of said sand storage tank (31); (6) Opening said second sand addition valve (36) and addition of molding sand to said gun head device (2). Sand addition dosing mechanism claim 1 , characterized in that said first sand addition valve (32) is a pneumatic valve and said weighing element (35) is an electronic scale or a weight sensor, said automatic control device being a controller and a pneumatic valve drive device, said weighing element being connected to the input end of said control device, said pneumatic valve being connected to the output end of said control device through said pneumatic valve drive device. Sand addition dosing mechanism claim 1 , characterized in that said first sand adding valve (32) is an electromagnetic valve and said weighing element (35) is an electronic scale or a weight sensor, said automatic control device being a controller and an electromagnetic valve driving device, said weighing element being connected to the input end of said control device, said electromagnetic valve being connected to the output end of said control device through said electromagnetic valve driving device. Sand addition dosing method for a core shooter using the sand addition dosing mechanism claim 1 wherein the molding sand in said dosing tank (34) has a set weight W, the valve opening of said first sand addition valve (32) having a maximum diameter DN, characterized in that the method comprises the steps of: (1) Closing said second sand addition valve (36), starting the vibrating electric motor (33) of said sand storage tank (31) and opening the first sand addition valve (32), regulating the valve opening of said first sand addition valve (32) to the maximum sand discharge diameter DN, adding molding sand to said metering tank (34), real-time weighing of the weight of molding sand in said metering tank (34) by the weighing member (35); (2) When the weight of molding sand in said metering tank (34) reaches M1, regulate the valve opening of said first sand adding valve (32) to DN1, where 1/2M ≤ M1 < 2/3M and 2/3DN < DN1 ≤ 4/5DN; (3) When the weight of molding sand in said metering tank (34) reaches M2, regulate the valve opening of said first sand adding valve (32) to DN2, where 2/3M ≤ M2 < 3/4M and 1/3DN < DN2 ≤ 2/3DN; (4) When the weight of molding sand in said metering tank (34) reaches M3, regulate the valve opening of said first sand adding valve (32) to DN3, where 3/4M ≤ M3 < 5/6M and 1/6DN < DN2 ≤ 1/3DN; (5) when the weight of the molding sand in said metering tank (34) reaches the set M, closing said first sand adding valve (32) and stopping the operation of the vibrating electric motor (33) of said sand storage tank (31); (6) Opening said second sand addition- valve (36) and addition of molding sand to said shooting head device (2).

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