TW201741047A - Method and device for supplying casting sand to sand hopper - Google Patents

Abstract

Provided are a method and device for supplying casting sand to a sand hopper (11), whereby attachment of a means for sensing casting sand (17) to the sand hopper (11) can easily be adjusted, and waste can be reduced by controlling the supplying of casting sand through use of the sensing means. This method and device for supplying casting sand to a sand hopper (11) comprises sensing the amount of casting sand (17) in the sand hopper through use of a laser sensor (12) provided to the sand hopper (11), and supplying casting sand to the sand hopper (11) when the sensing result is below a set lower-limit value.

Description

Method and device for supplying cast sand to sand funnel

The present invention relates to a method and apparatus for supplying molten sand to a casting sand for a sanding funnel for casting sand supplied to a molding machine.

In order to temporarily store the foundry sand by kneading the casting sand supplied to the molding machine by using a kneading machine, an sand funnel was used.

In the sand funnel, as shown in Patent Document 1, a level switch is provided as a means for detecting the foundry sand. The purpose of setting the level switch is to supply the sand to the sand funnel, for example, when the amount of sand to be cast is less than a predetermined amount. However, the level switch needs to adjust the installation position according to the sand property of each customer, etc., which is a very labor-intensive operation. In addition, regarding the level switch, it is only known whether or not there is sand in the installation place, and it is impossible to continuously grasp the total amount of sand in the sand funnel. Therefore, when a control is performed according to the amount of sand in the sand funnel, a plurality of level switches have to be used, so that there is a problem that the work of adjusting the mounting position is further increased.

The object of the present invention is to provide a method and a device for supplying a casting sand for supplying sand to a sand funnel, that is, the installation and adjustment of the detecting means of the sand casting sand can be easily performed, and the detecting means can be utilized by using the detecting means Master the overall amount of sand in the sand funnel and control the supply of sand to reduce waste.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. SHO 57-195557

A method for supplying a foundry sand to a sand hopper according to the present invention, which is completed in order to solve the above problems, is characterized in that, in a sand funnel for storing a casting sand adjusted for supply to a molding machine, The laser sensor of the sand funnel detects the amount of sand in the sand funnel, and when the detection result is lower than the set lower limit, the casting sand is supplied to the sand funnel.

By using a laser sensor as a means of detecting the sand of the sand funnel, the amount of sand in the sand funnel can be continuously detected. Therefore, by changing the lower limit value of the comparison target as the detection result, the supply condition of supplying the foundry sand into the sand funnel can be changed without adjusting the mounting position of the laser sensor.

Preferably, the method for supplying the foundry sand to the sand funnel is to detect the amount of the foundry sand in the sand funnel by the laser sensor, when the detection result is lower than the set lower limit value, The amount of molding data received from the molding machine until the completion time of the operation is supplied to the sand funnel to the casting sand required for the remaining number of moldings when the number of moldings up to the completion time of the operation is less than the reference amount.

By such control, it is possible to store only the amount of sand necessary until the completion time of the work in the sand funnel, so that the work can be completed without leaving the kneaded sand. Thus, there is an advantage that it is not necessary to consume excess energy.

The casting sand supply device for supplying sand to a sand funnel according to the present invention is characterized in that: a kneading machine is provided to adjust the casting sand supplied to the molding machine; a sand funnel is used for storing the casting sand; and a laser sensor is provided. In the sand funnel; the belt conveyor supplies the sand to the sand funnel according to the signal from the laser sensor; and the belt feeder supplies the casting sand from the sand funnel to the molding machine.

By using a laser sensor as a means of detection, the amount of sand in the sand funnel can be grasped at any time. Therefore, it is not necessary to adjust the mounting position as a level switch.

Preferably, the computing device further includes an arithmetic device configured to detect, by the laser sensor, the amount of the foundry sand in the sand funnel, when the detection result is lower than the set lower limit value, The amount of modeling data received by the molding machine until the completion time of the operation is calculated, and when the number of modeling data up to the completion time of the operation is less than the reference amount, the amount of casting sand required for the remaining number of moldings is calculated, and The required amount of foundry sand is supplied to the above sand funnel.

According to this configuration, it is possible to store only the amount of sand necessary until the completion time of the work in the sand funnel, and it is possible to finish the work without leaving the kneaded sand. Thus, there is an advantage that it is not necessary to consume excess energy.

Preferably, the casting sand supply device for supplying the sand to the sand funnel is characterized in that: a plurality of laser sensors disposed in the sand funnel are sandwiched between the casting sand inlets of the top plate of the sand funnel The feeder is arranged in the front direction and arranged on the top plate.

The amount of foundry sand in the sand funnel can be more accurately detected by detecting the state change of the foundry sand in the sand funnel caused by the movement of the belt feeder by the laser sensor, and the above-mentioned laser sensor is more accurately detected. It is arranged in the direction of advancement of the belt feeder with the input opening of the casting sand.

Further, it is preferable that the casting sand supply device for supplying the foundry sand to the sand funnel is characterized in that a vibrator is provided in the sand funnel.

In the case where haning occurs in the sand funnel, the suspension is vibrated by the vibrator to eliminate the stagnation.

As described above, according to the present invention, the detection of the amount of sand in the sand funnel can be easily performed by using a laser sensor. Therefore, regarding the supply conditions for supplying the foundry sand into the sand funnel, only It is easy to change the setting value, and it is not necessary to adjust the mounting position of the laser sensor. In addition, by using a laser sensor, supply control of extremely fine cast sand can be performed, and waste can be reduced.

The application is based on Japanese Patent Application No. Hei. No. 2016-100471, filed on May 19, 2016, the content of which is hereby incorporated by reference.

Further, the present invention should be understood more fully by the following detailed description. However, the detailed description and specific examples are illustrative of the preferred embodiments of the invention It is to be understood that various changes and modifications will be apparent to those skilled in the art.

The Applicant does not intend to disclose any of the described embodiments to the public, and the disclosed changes may not be included in the language of the patent application in the alternative case as part of the invention.

In the description of the specification or the claims, the use of the singular and plural terms is to be construed as a singular and plural. The use of any of the exemplified or exemplified terms (such as "the" or "an" or "an" Limit it.

11‧‧‧ sand funnel

12, 12a, 12b‧‧‧ laser sensor

13‧‧‧belt conveyor

14‧‧‧Band feeder

15‧‧‧Molding machine

16‧‧‧Machine

17‧‧‧cast sand in the sand funnel

18‧‧‧ cast sand inlet

19‧‧‧ top board

21‧‧‧ arithmetic device

31‧‧‧ vibrator

Fig. 1 is a front view showing an arrangement state of a casting sand supply device and a molding machine for supplying sand to a sand funnel in the present invention.

2 is a view schematically showing a casting sand supply device for supplying sand to a sand funnel according to the present invention; Partial profile front view.

3 is a cross-sectional view taken along line A-A of FIG. 2, (A) shows the case where the laser sensor is two, and (B) shows the case where the laser sensor is four.

Fig. 4 is a partial cross-sectional front view schematically showing a modification of the casting sand supply device for supplying sand to the sand funnel in the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, in order to supply the foundry sand to the molding machine 15, a sand funnel 11 as a temporary storage place for the foundry sand is provided. The foundry sand is adjusted by the kneading machine 16, and then introduced into the sand funnel 11 by the belt conveyor 13. The cast sand 17 stored in the sand funnel 11 is discharged from the sand funnel 11 by the belt feeder 14 at the timing of molding by the molding machine 15, and is introduced into the molding machine 15. The shape of the sand funnel 11 is not particularly limited, but the horizontal cross-sectional shape is preferably circular or rectangular. The sand funnel 11 has a top plate 19 at the upper portion, and a cast sand inlet 18 is formed at the center (see Fig. 3). The cast sand to be introduced from the casting sand inlet 18 is generally placed in the sand funnel 11, and is stacked in a shape having a high center portion and a low circumference (see Fig. 2).

As shown in FIG. 2, a laser sensor 12 is disposed above the sand funnel 11, and the linear distance from the position of the laser sensor 12 to the surface position of the casting sand 17 stored in the sand funnel 11 can be measured. . Since the measured amount can be used to infer the amount of sand to be cast, when the predetermined value is set lower than the predetermined value in the laser sensor 12, a signal is sent to the kneading machine 16 from the kneading machine 16 to the sand funnel 11 via the belt conveyor 13. Supply cast sand. Additionally, a control system can also be included in the laser sensor 12.

Figure 3 shows the mounting position of the laser sensor 12 of the device. The mounting position of the laser sensor 12 is sandwiched between the casting sand inlets 18 provided in the center of the top plate 19 of the sand funnel 11. One of the downstream side (12a) and the upstream side (12b) in the forward direction of the belt feeder 14 is disposed in parallel with the advance direction of the belt feeder 14 (Fig. 3(A)). Or two ((B) of FIG. 3) laser sensors 12 are arranged. The laser sensor 12 is disposed on the downstream side and the upstream side in the forward direction of the belt feeder 14 with the casting sand inlet 18 interposed therebetween, whereby the casting can be measured on both sides of the apex of the stacked casting sand 17 The height of the sand 17. Since the cast sand 17 is carried out by the belt feeder 14, there is a case where the height of the downstream side and the upstream side in the carry-out direction are different. In this case, the estimation accuracy of the amount of the foundry sand 17 can be improved by performing measurement on both sides. Further, it is preferable that the laser sensors 12 do not have to be parallel to the advance direction of the tape feeder 14, but are arranged in the forward direction.

In the case where the laser sensor 12 is two and four, it is preferable to perform control such that when all the laser sensors 12 are lower than a predetermined value, the signal is sent to the kneading machine 16 . The self-mixing machine 16 supplies the foundry sand to the sand funnel 11 via the belt conveyor 13. In addition, the signal may be transmitted when only one of the measured values is lower than the predetermined value, and may be transmitted when the sum of the measured values of all the laser sensors 12 is lower than a predetermined value.

In addition, by using the laser sensor 12, when the amount of sand in the sand funnel 11 reaches the upper limit amount of the reference or the abnormal upper limit amount or the abnormal lower limit amount, it is not necessary to increase the device as the level switch response. Therefore, the cost of the device or the time for installation adjustment can be saved.

Not limited to the example of FIG. 2 or FIG. 3, for example, when the number of the laser sensors 12 is one, the measurement accuracy may be lowered, but it may be used. The mounting position in this case is preferably near the casting sand inlet port 18.

Fig. 4 shows a modification of the present invention. The position from the position of the laser sensor 12 to the cast sand stored in the sand funnel 11 is measured by the laser sensor 12 disposed on the top plate of the sand funnel 11. A linear distance from the surface position of 17 is transmitted, and the measured values are transmitted to the arithmetic unit 21. The arithmetic unit 21 calculates the average value of the measured values, for example, and estimates the amount of sand to be cast. Further, the self-forming machine 15 receives the amount of modeling data from the time when the molding machine 15 is transferred to the arithmetic unit 21 until the completion time of the job. Further, when it is judged that the estimated amount of foundry sand is lower than a predetermined value set in the arithmetic unit 21, the foundry sand is supplied to the sand funnel 11. At this time, when the number of molds up to the completion time of the work is set to be less than the reference number of the arithmetic unit 21, the remaining casting sand required for the completion of the work completion time is calculated, and the sand is moved to the sand funnel. 11 The amount of the foundry sand is supplied. A predetermined amount of the foundry sand is supplied to the sand funnel 11 when the number of modeling data until the completion time of the operation is larger than the number of the predetermined number set in the arithmetic unit 21. Here, the predetermined amount is, for example, the amount of sand to fill the sand funnel 11 . Further, the arithmetic unit 21 may be included in a casting sand supply device, a molding machine, and a control device (not shown) having such a molding unit.

Further, as shown in FIG. 2 or FIG. 4, when the vibrator 31 is provided on the side surface of the sand funnel 11, and the suspension is caused in the sand funnel 11, the vibrator 31 is used to vibrate the casting sand 17 in the sand funnel 11. This eliminates stagnation.

Thus, according to the present invention, the detection of the amount of sand in the sand funnel can be easily performed by using a laser sensor. Therefore, the supply condition for supplying the foundry sand into the sand funnel can be easily changed by changing the set value, and it is not necessary to adjust the mounting position of the laser sensor. In addition, by using a laser sensor, supply control of extremely fine cast sand can be performed, thereby reducing waste.

Hereinafter, the main symbols used in the present specification and drawings will be collectively shown.

11‧‧‧ sand funnel

12‧‧‧Laser sensor

13‧‧‧belt conveyor

14‧‧‧Band feeder

15‧‧‧Molding machine

16‧‧‧Machine

17‧‧‧cast sand in the sand funnel

31‧‧‧ vibrator

Claims (6)

A method for supplying cast sand to a sand funnel, characterized in that: in a sand funnel for storing cast sand adjusted for supply to a molding machine, laser sensing is provided by the sand funnel The device detects the amount of foundry sand in the sand funnel, and supplies the foundry sand to the sand funnel when the detection result is lower than the set lower limit value. The method for supplying a foundry sand to a sand funnel according to the first aspect of the patent application, wherein the amount of the foundry sand in the sand funnel is detected by the laser sensor, and the detection result is lower than When the lower limit value is set, the amount of molds received from the above-mentioned molding machine to the completion time of the work is supplied to the sand funnel when the number of molds up to the completion time of the work is less than the reference amount. Casting sand required for the number of molds. A casting sand supply device for supplying casting sand to an sand funnel, comprising: a kneading machine for adjusting a casting sand supplied to a molding machine; an sand funnel for storing the casting sand; a laser sensor, setting The sand funnel; a belt conveyor that supplies the sand to the sand funnel according to a signal from the laser sensor; and a belt feeder that supplies the casting sand from the sand funnel to the molding machine. A casting sand supply device for supplying sand to a sand funnel according to the third aspect of the patent application, further comprising: an arithmetic device, wherein the computing device is controlled in such a manner that the sand sensor is detected by the laser sensor The amount of casting sand, when the detection result is lower than the set lower limit value, the amount of modeling data received from the above-mentioned molding machine to the completion time of the operation, the amount of modeling data up to the completion time of the operation is Calculate the remaining number of models when the number of bases is below The amount of casting sand required is supplied to the above-mentioned sand funnel by the required amount of casting sand. A casting sand supply device for supplying sand to a sand funnel according to the third or fourth aspect of the patent application, wherein the plurality of the laser sensors disposed in the sand funnel are sandwiched between the top plates of the sand funnel The casting sand inlet is arranged in the forward direction of the belt feeder, and is disposed on the top plate. A casting sand supply device for supplying sand to a sand funnel according to the third or fourth aspect of the patent application, wherein the sand funnel is provided with a vibrator.