KR200224209Y1 - Valve systeam for rotary type pulp molding machine - Google Patents

Abstract

The present invention is a rotary polyhedron type pulp molding machine that integrates the supply valves for vacuum, compressed air required for molding, dehydration and demolding with the molding machine so that the supply and adjustment of vacuum and compressed air can be continuously performed on a polyhedron. 1. A valve device for a pulp mold molding machine, the apparatus being divided into first, second, third and fourth chambers by ribs radially divided into a polyhedral shape, each of the first, second, third and fourth chambers being formed by sides. It is connected to each side of the polyhedron, and a plurality of rows of adsorption holes are formed. In the center, shaft holes are formed along the length and valve holes are formed on the front and rear sides. A vacuum shaft having first, second and third suction sides formed therein, a fixed body coupled to both ends of the vacuum shaft and having a compressed air supply valve coupled to an upper portion thereof, and a disc Since the slide plate is provided with a through hole corresponding to the valve hole formed in the front and rear of the body portion in the shape, it is possible to increase the product quality and production efficiency by improving the molding and dehydration (drying), increase the dehydration efficiency and the requirements in the drying chamber It is economical to save calories and time, and to save energy and excellent drying efficiency.

Description

VALVE SYSTEAM FOR ROTARY TYPE PULP MOLDING MACHINE}

The present invention relates to a valve device for a rotary pulp molding machine, and more specifically, to a rotary polyhedral pulp molding machine, integrating a supply valve for vacuum and compressed air necessary for molding, dehydration and demolding with the shaft and the rotating body of the molding machine. It is possible to supply and adjust vacuum and compressed air continuously in two or more polyhedrons to improve the molding and drying (dehydration) of the pulp mold, and to improve the productivity and efficiency of the product. It is about.

In general, the pulp mold forming machine is a device for producing a packaging buffer, disposable food containers, etc., using waste paper and natural pulp as raw materials. Pulp mold molding machine, which is currently known, is a double-sided (two sides) rotary type molding machine. A pulp that is dissociated anhydrous by mixing the valve device separated on both sides with one side of the valve as the one side of the valve, lifting type, inverted wet forming method, and adhesives such as starch and glue. Is applied to a mold by a transfer, and a dry forming method of heating and pressing molding is used.

This production process is completed through a process such as raw material composition → concentration control and stirring → molding → dewatering and demolding → drying (drying furnace or hot mold) → post-treatment.

Such production process can be divided into molding → dewatering → deforming → drying (drying system by drying furnace) and molding → dewatering → shaping and drying (drying system by hot mold) → demolding. Or immerse the finished mold (molding mold) coated with gold or resin mesh in the pulp solution in a pulp raw material tank containing a pulp solution mixed well with water at an appropriate concentration. As the pulp solution is sucked by the vacuum, the fibers of the pulp solution are adsorbed onto the surface of the molding die, adsorbed and laminated to a certain thickness, and then moved to the air by the secondary dehydration process. It is dehydrated to moisture content and is formed and dried in the 3rd drying process. Corresponding molding molds are required and pressurized to the appropriate pressure by the molds to form and dry together. Steam generated during pressurization by the molds is sucked by the vacuum to the atmosphere through the vacuum tank. Drained, moisture-removed and dried pulp mold is a dry production system by hot mold demolding from molding mold by 4th demolding process, and the drying production system by drying furnace is 1st forming process and 2nd dehydration The process is carried out by vacuum bar, the same process as the hot mold production system, and the third demolding process is to convert the vacuum from the demolding mold to the trans mold to release the pulp mold molded in the molding mold, After the vacuum is converted to compressed air and demolded in a moving device leading to the drying chamber, the pulp mold which is demolded is subjected to the pulp mold fiber by the fourth drying process. In this way, the moisture contained in is dried by hot air or far-infrared rays. At this time, it is a system that supplies and delays the required amount of heat and time according to variables such as the size, thickness, and moisture content of the pulp mold. The molded product is completed, and each production system can be selected according to the use and size of the product.

The rotary pulp molding machine as described above has been filed by the applicant (Application No. 2000-56573).

On the other hand, Figure 1 is a schematic view showing a conventional pulp mold forming apparatus, the pulp mold forming apparatus is formed on the upper and lower surfaces of the rotating body (2) rotated in one direction by a driving means (not shown) 4) is coupled, and the upper side of the mold 4 has a configuration in which the transfer mold 8 driven up, down, left and right by the transfer device 6 is coupled.

At this time, the water storage tank (T) containing a predetermined amount of pulp solution is installed below the rotating body (2), the mold (4) coupled to the upper and lower surfaces during the rotation of the rotating body 2 is locked in the pulp solution. In addition, the mold 4 and the transfer mold 8 are connected with a vacuum device (not shown) for adsorption of the pulp solution.

Accordingly, while the mold 4 is immersed in the pulp solution by the rotation of the rotating body 2, the pulp solution is adsorbed by vacuum at a constant thickness along the surface of the mold 4, and the pulp mold of a predetermined form is formed and continued. When the mold 4 is positioned below the transfer mold 8 by the rotation of the whole 2, the vacuum is released and the transfer mold 8 is lowered to vacuum and adsorb the pulp mold adsorbed and molded along the mold surface. Next, the pulp mold is molded as it is moved up and down by the transfer means 6 and transferred to the conveyor C.

In such a pulp mold forming machine (see FIG. 1), a mold used for adsorption of the pulp mold is in a single or double (upper and lower) form, and a vacuum device used for adsorption of the pulp mold is individually driven according to each mold. A plurality of valves are used.

However, in the conventional pulp mold forming machine as described above, since the vacuum device for adsorption of the pulp mold has a configuration in which individual driving is performed for each mold, its configuration is complicated, and many pneumatic components and installation space are required. Since the mold installation for adsorbing the mold is restricted, the mold is limited to a single or double form, resulting in uneconomical disadvantages such as inefficiency and reduced productivity.

The present invention is to solve the conventional problems as described above, the purpose is to integrate the valve device for the supply of vacuum and compressed air required for the molding, dewatering and demolding of the pulp mold with a molding machine vacuum and compression The supply and adjustment of air can be done collectively and continuously in polyhedrons (multiple molds), which improves production efficiency by improving molding, drying (dehydration) and productability, and in the production cycle with a rotary polyhedral molding machine. Irrespective of the extension of the dehydration time, the dehydration efficiency can be increased to reduce the amount of heat and delay in the drying room, thereby providing a new type of rotary pulp molding machine valve device that can increase energy efficiency and save energy. It is.

In order to achieve the above object, the present invention is a rotary type pulp molding machine, the valve device is divided into first, second, third, fourth chamber by ribs radially divided inside into a polyhedral shape, respectively 1, 2, 3, and 4 chambers are connected by sides, and molds are assembled on each side of the polyhedron with a plurality of rows of adsorption holes. In the form of a pipe having a constant length, a split side along the outer circumferential surface is formed along the outer circumferential surface in the middle thereof, and a vacuum shaft having first, second, and third suction sides formed therein, and a coupling hole is formed in the center thereof to penetrate and insert through the vacuum shaft. A fixed body having a compressed air supply valve coupled to the fourth chamber or both sides of which the vacuum is closed, and a slide plate having a through hole corresponding to a valve hole formed on the front and rear surfaces of the body part in a disk shape. Has the features provided.

In this invention, the first, second, third suction side formed in the vacuum shaft has a feature that is connected by a communication groove having a constant depth.

In addition, the first, second, third suction side is an elliptical ' 'In the body portion, the first, second, third, and fourth chambers for vacuum and adsorption are respectively formed in the body portion and the first, second, third, fourth valve ball is formed in the fixed body, The first, second, third, and fourth valve holes have a feature in which a long hole is formed.

1 is a schematic view showing a conventional pulp mold forming machine,

Figure 2 is an exploded perspective view showing a valve device for a rotary pulp molding machine according to the present invention,

Figure 3 is a longitudinal sectional view showing a valve device for a rotary pulp molding machine according to the present invention,

Figure 4 is a cross-sectional view showing a valve device for a rotary pulp molding machine according to the present invention,

Figure 5 is a schematic diagram for explaining the operating state of the rotary pulp molding machine according to the present invention,

Figure 6 is an enlarged perspective view of the main portion showing another embodiment of the vacuum shaft of the valve device according to the present invention,

Figure 7 is an exploded perspective view showing another embodiment of the valve device according to the present invention,

8 is a longitudinal cross-sectional view of a valve device according to another embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10: valve device 20: body

21: Rib 22, 22 ': The first chamber

23, 23 ': 2nd chamber 24, 24': 3rd chamber

25, 25 ': 4th chamber 22a, 23a, 24a, 25a: side

26: suction hole 27: shaft ball

28: valve ball 30: vacuum shaft

31: first suction side 32: second suction side

33: third suction side 34: communication groove

40: fixed body 41: binding hole

42: compressed air supply valve 43: first valve ball

43a, 44a, 45a, 46a: long hole 44: second valve hole

45: third valve ball 46: fourth valve ball

50: slide plate 51: through

C: Conveyor D: Mold

D ': Pressurized mold T: Reservoir tank

Hereinafter, the present invention in more detail by the accompanying drawings as follows.

Figure 2 is an exploded perspective view showing a valve device for a rotary pulp molding machine according to the present invention, the body portion 20 of the valve device 10 is a polyhedral shape by the rib 21, the inside is radially divided into the first , 2, 3, 4 chambers 22, 23, 24, 25, wherein each of the first, 2, 3, 4 chambers 22, 23, 24, 25 has sides 22a, 23a, 24a, 25a. And a plurality of rows of adsorption holes 26 are formed on each surface thereof, and a shaft hole 27 and a valve hole 28 are formed on the front and rear surfaces along a length of the center, and the vacuum shaft 30 is constant. The first, second and third suction sides 31, 32 and 33 are formed along the outer circumference along the outer circumferential surface at the center in the form of a pipe having a length, and the fixing body 40 has a coupling hole at the center thereof. 41 is formed and the compressed air supply valve 42 is coupled to one side upper portion, the slide plate 50 is a disk-shaped through hole corresponding to the valve hole 28 formed on the front and rear of the body portion 20 (51) ) Formed It indicates that.

At this time, the first, second, third suction sides 31, 32, 33 formed in the vacuum shaft 30 indicates that it is connected by a communication groove 34 having a predetermined depth.

Figure 3 is a longitudinal cross-sectional view showing a valve device for a rotary pulp molding machine according to the present invention, the rib 2 is projected inward to the inner surface of the polyhedral body portion 20, the inside of the first, second, third, fourth chamber (22, 23, 24, 25), and ribs 21 and ribs 21 are formed between sides 22a, 23a, 24a, and 25a so as to communicate with each other. Four chambers 22, 23, 24, 25, that is, a plurality of rows of adsorption holes 26 are formed on each surface of the body portion 20, and the shaft hole 27 formed in the center of the body portion 20 is a vacuum shaft. 30 is penetrated and coupled, but the first, second and third suction sides 31, 32, 33 formed in the middle of the vacuum shaft 30, the vacuum shaft 30 is the first of the body portion 20 , 2, 3 to show that coupled to the chamber 22, 23, 24 in communication.

At this time, since the fourth chamber 25 of the body portion 20 is closed by the vacuum shaft 30, the vacuum is released and the first, second, and third chambers 22, 23, and 24 are formed of the first, second, and third chambers. It is shown that the vacuum state is maintained as the communication grooves 34 are connected to each other by the communication grooves 34 connected to the predetermined depths along the second and third suction sides 31, 32, and 33.

Figure 4 is a cross-sectional view showing a valve device for a rotary pulp molding machine according to the present invention, the mold (D) is coupled to each side formed with the suction hole 26 of the body portion 20, the slide plate on the front and rear 50 and the compressed air supply valve 42 is coupled to the fixed body 40 is coupled, wherein, the body portion 20 and the slide plate 50 to which the mold (D) is coupled is a vacuum shaft ( 30 is rotated in one direction from the starting point, and by the rotation of the body portion 20, the vacuum shaft 30 opens and closes the first, second, third and fourth chambers 22, 23, 24 and 25 at regular intervals. When the fourth chamber 25 is closed, air having a constant pressure is supplied into the fourth chamber 25 from the compressed air supply valve 42 coupled to the fixed body 40.

Therefore, as the body portion 20 and the slide plate 50 are rotated around the vacuum shaft 30, the mold D is locked to the pulp mold storage tank T installed below the body portion 20. The pulp mold is molded by being adsorbed to the mold by vacuum, and the moisture is removed (dehydrated) by vacuum in the second and third chambers 23 and 24, dried and then compressed air supplied from the fourth chamber 25. It is demolding.

Figure 5 is a schematic view for explaining the operating state of the rotary pulp molding machine according to the present invention, a plurality of molds (D) are coupled to the outer surface of the polyhedral body portion 20 at a predetermined interval and ribs therein The vacuum shaft 30 is fitted into the first, second, third, and fourth chambers 22, 23, 24, and 25 by the 21 and is fitted into the shaft hole 27 formed at the center thereof, and the middle of the vacuum shaft 30 is combined. The first, second, and third chambers 22, 23, and 24 of the vacuum shaft 30 and the body part 20 communicate with each other by the first, second, and third suction sides 31, 32, and 33 formed at the first and second suction sides 31, 32, and 33. Two pulp mold forming machines equipped with a combined valve device 10 are installed to interlock with each other. At this time, a storage tank T containing a predetermined amount of pulp solution is positioned below one pulp mold forming machine, and the other pulp mold is formed. The lower side of the molding machine shows that the conveyor C driven by the transmission means (not shown in the figure) is installed.

In addition, one side of the pulp mold forming machine or one side of the other pulp mold forming machine is immersed in the storage tank (T) containing the pulp solution to form and dehydrate the pulp mold adsorbed to the mold (D) by vacuum (adsorption by vacuum). It shows that the press mold (D ') with an electric heater (not shown in the figure) is installed.

6 is an enlarged perspective view of a main portion showing another embodiment of the vacuum shaft of the valve device according to the present invention, wherein the first, second, and third suction edges 31, 32, and 33 formed at the center of the vacuum shaft 30 are formed; ' 'Represents what consists of the shape.

7 is an exploded perspective view showing still another embodiment of the valve device according to the present invention, Figure 8 is a longitudinal cross-sectional view of the valve device according to another embodiment of the present invention, the first, 2, 3, and 4 chambers 22 ', 23', 24 ', and 25' are each formed as an independent body and are installed in the body 20, and the fixed body 40 has the first, 2, 3, and 4 chambers ( 22 ', 23', 24 'and 25'), the first, second, third and fourth valve holes 43, 44, 45 and 46 are formed, and the first, second, third and fourth valve holes are formed. (43, 44, 45, 46) shows that the long holes 43a, 44a, 45a, 46a are formed.

Here, the electric motor is used as a means for rotating the body portion and the slide plate of the valve device, and the vacuum device is connected to each connecting portion (between the shaft hole and the vacuum shaft of the body portion, the slider and the fixed body coupled to the front and rear of the body portion) At the connecting part of), the sealing member (packing) is installed in single or double to maintain perfect vacuum condition and prevent air tightness and leakage during vacuum for molding the pulp mold. Without a separate description, the process and means for supplying the vacuum means for vacuum and compressed air supplied during demolding are well-known techniques generally used in equipment using hydraulic pressure, and thus detailed descriptions and descriptions of the drawings will be omitted. do.

Referring to the use state of the present invention as follows.

As shown in Figs. 2 to 5, the ribs 21 are divided into first, second, third, and fourth chambers 22, 23, 24, and 25 by the ribs 21 which are radially divided into a polyhedron. The first, second, third, and fourth chambers 22, 23, 24, and 25 are communicated by the sides 22a, 23a, 24a, and 25a, and a plurality of rows of adsorption holes 26 are formed on each side thereof. Along the length of the shaft hole 27 and the body portion 20, the valve hole 28 is formed on the front and rear, and in the form of a pipe having a constant length in the middle along the outer circumferential surface in the middle of the divided sides along the first and second , The vacuum shaft 30 having the third suction valves 31, 32, and 33 formed therein, and a coupling hole 41 formed at the center thereof, coupled to both ends of the vacuum shaft 30, and compressed air above the demolding portion. A fixed plate 40 having a supply valve 42 coupled thereto, and a slide plate 50 having a through hole 51 corresponding to the valve hole 28 formed on the front and rear surfaces of the body portion 20 in a disk shape. Made of vacuum The first, second, and third suction sides 31, 32, and 33 formed on the 30 have a pulp mold forming machine equipped with a valve device 10 connected by a communication groove 34 having a constant depth. In order to mold a pulp mold product having a predetermined shape, first, as shown in FIG. 5, a plurality of molds may be formed at predetermined intervals on an outer surface on which the suction holes 26 of the body portion 20 of the valve device 10 are formed. Two pulp mold forming machines combined with D) are installed in a set spaced space.

At this time, the water tank (T) containing the pulp solution is installed below one side of the pulp mold molding machine, the conveyor (C) is installed below the other pulp mold molding machine, the drive side of the one side pulp mold molding machine or above the other pulp mold molding machine A press mold D 'driven by means (cylinder or cam) is provided.

In this state, the body portion 20 and the slide plate 50 are rotated in one direction starting from the vacuum shaft 30 by the rotating means, and the first, second, and third chambers of the body portion 20 by the vacuum means ( The pulp solution is adsorbed to the mold (D) coupled to communicate with the adsorption hole (26) while maintaining the vacuum state on the 22, 23, 24 to form a pulp mold, wherein the pulp mold adsorbed on the mold (D) Moisture is dehydrated and dried by the vacuum of the first, second and third chambers 22, 23 and 24, dehydrated in the fourth chamber 25 and secondary dewatered and dried in the other pulp mold forming machine. Is transported by.

As such, when the pulp mold is molded, the vacuums of the first, second, and third chambers 22, 23, and 24 are first, second, and third suction sides 31, 32, and 33 formed on the vacuum shaft 30. ) And the sides 22a, 23a, and 24a are in communication with each other, even though the vacuum is made and the body 20 rotates, the first, second, and third suction sides 31, 32, and 33 are always in the body. The first, second, and third chambers 22, 23, and 24 of the part 20 can maintain the vacuum at all times, so that the first, second, and third suction sides 31, 32, 33 is in communication with and connected to each other by the communication groove 34, so that the vacuum state can be maintained even during rotation, and the mold D to which the pulp mold is adsorbed is rotated by the body portion 20, and the fourth chamber ( 25, the side 25a of the fourth chamber 25 is closed by the vacuum shaft 30, so that the vacuum of the fourth chamber 25 is released and at the same time, the fourth chamber 25 slides. Compression holes coupled to the through hole 51 and the fixed body 40 formed in the 50 As it is communicated with the feed valve 42, compressed air having a predetermined pressure is supplied into the fourth chamber 25 will be thereby deforming the pulp mold to the compression mold (D).

Therefore, the pulp mold demolded from the mold D positioned in the fourth chamber 25 is again adsorbed to the mold of the other pulp mold forming machine, and the moisture remaining by vacuum is dehydrated and dried, followed by the Kenvey C phase. It is demolded and transferred to

At this time, the rotational force of the same cycle is given between the pulp mold forming machines and the molds to which the pulp mold is adsorbed have a shape corresponding to each other, and the compressed air supply for vacuum and demolding is made identical by the valve device 10.

In addition, in dewatering and drying the pulp mold by vacuum, shaping is required to prevent deformation by dehydration and drying of the pulp mold and to smooth and smooth the roughness of the surface of the pulp fiber adsorbed outside the mold network. , Which is formed by a press mold (D ') installed on the side of the one side pulp mold forming machine or the upper side of the other pulp mold forming machine (see Fig. 5), and the pulp mold is adsorbed while being immersed in the water storage tank (T) by vacuum. When the mold D is rotated to reach the position corresponding to the second chamber 23 at the position corresponding to the first chamber 22, the pressing mold D 'is advanced by the driving means, so that the mold D The pulp mold is dehydrated and dried and pressed to maintain its shape to prevent deformation of the pulp mold due to dehydration and drying, and at the same time, the pulp mold is fixed to the pulp mold by an electric heater built into the press mold (D '). The heat is applied to dry the product is completed, the steam generated is released to the atmosphere by natural discharge or ejector.

As shown in FIG. 6, the first, second and third suction sides 31, 32, and 33 formed on the vacuum shaft 30 are referred to as' 'To have a shape, it is possible to maintain the vacuum state of the first, second, third chambers 22, 23, 24 at all times even when the body portion 20 is rotated, or shown in FIGS. 7 and 8 As described above, the first, second, third, and fourth chambers 22 ', 23', 24 ', and 25' for vacuum and adsorption of the pulp mold form an independent body and are installed in the body part 20, and the fixed body ( 40, the first, second, third, and fourth valve holes 43, 44, 45, 46 are in communication with the first, second, third, and fourth chambers 22 ', 23', 24 ', 25'. Is formed, but the first, second, third, fourth valve hole (43, 44, 45, 46) may be formed in the long hole (43a, 44a, 45a, 46a).

On the other hand, as described above, in forming the pulp mold, the rotation period of the body portion 20 can be arbitrarily adjusted according to a desired state of the user, that is, the dehydration and drying state of the pulp mold, that is, continuous rotation in the same cycle, The pulp mold is adsorbed from immediately after the pulp mold is demolded from the mold D. The pulp mold is dehydrated and dried while passing through the first, second, and third chambers 22, 23, and 24, and then, the compressed mold is supplied by the compressed air supply valve 42. The process in which the pulp mold is immediately demolded from the mold in the four chamber 25 is continuously performed or the mold is locked in the pulp solution storage tank T in the mold D, so that the pulp mold is adsorbed by vacuum. (First cycle), the process by which the mold D is rotated by 90 ° and shaped by the press mold (D ') (second cycle), and then rotated by 90 ° by the mold D (3) to the third chamber 24. After the process (third period) that is located in the ∠90 ° it is rotated in the fourth chamber (25) The ball can be released and freely set a period necessary to compression (4th cycle) that the air is supplied to the pulp mold stripping.

In this way, by integrating the valve device for supplying the vacuum and compressed air necessary for molding, dewatering and demolding the pulp mold with the molding machine, the supply and adjustment of the vacuum and compressed air can be continuously performed in a polyhedron and the molding and dehydration (drying) ), The product productivity can be increased and the dehydration time can be extended and shortened regardless of the molding cycle, thereby increasing drying efficiency and saving energy, and supplying vacuum and compressed air selectively from one side or both sides. .

As described above, in forming the pulp mold, the valve device for supplying the vacuum and compressed air necessary for molding, dewatering and demolding is integrated with the molding machine, so that the supply and adjustment of the vacuum and compressed air is performed in a polyhedral (multiple mold joints). ), And improve the molding and dehydration (drying) to improve product quality and production efficiency, and the rotary type can extend and shorten the dehydration time regardless of the molding cycle. It can reduce the amount of heat and time required, and it is economical to save excellent drying efficiency and energy, and can supply vacuum and compressed air selectively. There is.

Claims (5)

In rotary pulp molding machine, The first, second, third, and fourth chambers 22, 23, 24, and 25 are partitioned by ribs 21 that are radially divided into polyhedral shapes, respectively. , 23, 24, 25 are communicated by the sides 22a, 23a, 24a, 25a, and a plurality of rows of adsorption holes 26 are formed on each side, and the shaft hole 27 and the front and rear sides along the length in the center. A body portion 20 having a valve hole 28 formed therein; A vacuum shaft 30 in which a first, second and third suction sides 31, 32 and 33 are formed along the outer circumferential surface along the outer circumferential surface in the form of a pipe having a predetermined length and the first, second and third suction sides 31 are formed; A fixed body 40 having a coupling hole 41 formed at a center thereof, coupled to both ends of the vacuum shaft 30, and having a compressed air supply valve 42 coupled to one side thereof; The valve device for rotary pulp molding machine, characterized in that the disk plate is provided with a slide plate (50) formed with a through hole (51) corresponding to the valve hole (28) formed on the front and rear of the body portion (20). The valve device of claim 1, wherein the body portion (20) forms a polyhedron and a plurality of molds (D) are coupled to the outer surface at predetermined intervals. The rotary type of claim 1, wherein the first, second, and third suction sides 31, 32, and 33 formed on the vacuum shaft 30 are connected by a communication groove 34 having a constant depth. Valve device for pulp mold forming machine. The method of claim 1, wherein the first, second and third suction sides 31, 32, 33 are elliptical shaped ' Rotary valve device for pulp molding machine, characterized in that the shape. The first and second chambers 22 ', 23', 24 ', and 25' for vacuum and adsorption are respectively formed in the body portion 20. It forms an independent body and is built in the body portion 20, and the first and second valve holes 43, 44, 45, and 46 are formed in the fixed body 40, and the first, second, third and fourth valves are formed. The ball device (43, 44, 45, 46) is a valve device for rotary pulp molding machine, characterized in that the long hole (43a, 44a, 45a, 46a) is formed.