JPH04122019U - Piezoelectric element unit for die lip adjustment - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a piezoelectric element unit for die lip adjustment, and in particular protects the piezoelectric element from the heat of the die body by supplying gas into the cylindrical case that holds the piezoelectric element. It is characterized by [Structure] In a piezoelectric element unit for die lip adjustment, which presses a flexible lip provided on a die body to adjust the gap between the lips, a cylindrical case provided on the die body, and a spring inside the cylindrical case are provided. a piezoelectric element provided through a member; a gas supply pipe provided in the cylindrical case for supplying gas into the cylindrical case; and an exhaust provided in the cylindrical case for discharging the gas. The piezoelectric element is cooled by the gas.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a piezoelectric element unit for die lip adjustment, and in particular, to a piezoelectric element unit that holds a piezoelectric element. By supplying gas into the cylindrical case, the piezoelectric element is protected from the heat of the die body. Concerning new improvements to protect

0002

[Conventional technology]

This type of piezoelectric element unit for die lip adjustment that has been used in the past is the first of its kind. There are many, but let's talk about some of the most representative ones. The configuration of the first conventional example disclosed in Publication No. 60-210418 can be mentioned. That is, in Fig. 3, molten resin enters from inlet 1 and is extruded from the gap between lip 2. is configured to be The symbol 3 is the die body, and heaters 4, 5, 6, and one side of the lip 2 of this die body 3 is provided with a flexible material having low rigidity. A bull lip 7 is formed. The flexible lip 7 is provided in the side portion 3a of the die body 3 by loosely fitting into the hole 8. The piezoelectric element 9 is configured to be pressed by a push rod 10 of the piezoelectric element 9. The gap between the lips 2 is adjusted by pressing. The upper surface of the piezoelectric element 9 is screwed onto the die body 3 via a washer 11. It is held down with bolt 12. Therefore, by tightening the bolts 12, an initial load is applied to the plurality of piezoelectric elements 9. After this initial load is set, apply a voltage of, for example, 200V. By doing so, it is possible to obtain an elongation of approximately 400μ, and press the flexible lip 7. The distance between the lips 2 can be adjusted by adjusting the distance between the lips 2.

0003 In addition, in the case of the configuration of the second conventional example shown in FIG. A heat insulating material 15 is provided on the wall 3aA, and this heat insulating material 15 prevents heat from the die body 3. is configured so that it is not transmitted to the piezoelectric element 9. Regarding other parts, the same parts as in Figure 3 are given the same reference numerals to avoid duplication. Therefore, its explanation is omitted.

0004

[Problem that the idea aims to solve]

The conventional piezoelectric element unit for die lip adjustment was constructed as described above. However, the following issues existed. In other words, when extruding molten resin from the lip of the die body, the temperature of the die body is The temperature of the piezoelectric element also rises as the temperature rises, but normally the heat resistance temperature of the piezoelectric element is 120℃. In the configuration shown in Figure 3, this heat-resistant temperature may be exceeded, and the gap between the lips This had a huge negative impact on the adjustment. In addition, in the case of the configuration shown in FIG. 4, since a heat insulating material is provided, the temperature of the die body is It can be used up to 00℃, but if the temperature exceeds that temperature, the heat resistance temperature of the piezoelectric element will decrease. This caused problems and made continuous use extremely difficult.

[0005] This invention was devised to solve the above-mentioned problems, and in particular, By supplying gas into the cylindrical case that holds the die, piezoelectricity is generated from the heat of the die body. It is an object of the present invention to provide a piezoelectric element unit for die lip adjustment that protects the element. purpose.

[0006]

[Means to solve the problem]

The piezoelectric element unit for die lip adjustment according to the present invention is provided in the die body and has a flexible Die-lip type that presses the flexible lip to adjust the lip spacing (T) In the piezoelectric element unit for medical treatment, a cylindrical case provided on the die body; A piezoelectric element provided in the cylindrical case via a spring member, and a piezoelectric element provided in the cylindrical case. a gas supply pipe for supplying gas into the cylindrical case; and a discharge hole provided for discharging the gas, the piezoelectric element being exposed to the gas. This configuration is designed to provide even more cooling.

[0007]

[Effect] In the piezoelectric element unit for die lip adjustment according to the present invention, the piezoelectric element is held Since gas supply and exhaust holes are formed in the cylindrical case, the lip of the die body When the temperature of the die body rises due to extrusion from the gas supply pipe The gas supplied from the cylindrical case passes through the piezoelectric element and is discharged from the exhaust hole. The elements are cooled extremely efficiently. According to the applicant's experimental example, when the temperature of the die body is 300°C, the temperature of the piezoelectric element is The temperature can be maintained at approximately 80℃, which is significantly lower than the heat-resistant temperature of 120℃. did it.

[0008]

【Example】

Below, along with the drawings, a preferred embodiment of the piezoelectric element unit for die lip adjustment according to the present invention will be described. Examples will be explained in detail. Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals. Figures 1 and 2 show a piezoelectric element unit for die lip adjustment according to the present invention. , FIG. 1 is a sectional view, and FIG. 2 is a sectional view showing another embodiment.

[0009] In the figure, the symbol 1 indicates the molten resin applied to the lip 2 of the die body 3. The thickness of the molten resin supplied from this inlet 1 is as described above. It is determined by the interval T between the lips 2. The interval T between the lips 2 is determined by the flexible lip formed at the end of the die body 3. It is configured so that it can be freely adjusted by pressing 7.

0010 A cylindrical case 21 is provided in the recess 20 of the die body 3, and the cylindrical case 21 A case tip 22 having a substantially T-shaped cross section is attached to one end 21a of the shaped case 21. It is fixed with bolts 23. Inside the cylindrical case 21, three stages of piezoelectric elements 9 are arranged in series via a spacer 24. The piezoelectric element 9 located at the tip of each of these piezoelectric elements 9 has a A rod-shaped protrusion 25 is fixed thereto. Note that the number of piezoelectric elements 9 is limited to three. For example, it can also be used alone.

[0011] A spring member 26 made of a spring is provided on the outer periphery of the protrusion 25. The protruding portion 25 is provided so as to penetrate through the through hole 22a of the case tip body 22 so as to be freely operable. At the same time, the spring force of the spring member 26 causes the protrusion 25 to always be attached to the rear. Forced.

0012 The first tip surface 22b of the case tip body 22 and the second tip surface 25 of the protrusion 25. a is in flush contact with the pressing surface 7a of the flexible lip 7, and the spring portion A flush state is always maintained by the action of the material 26.

[0013] The other end 21b of the cylindrical case 21 has a piece body 27 that is screwed together so as to be freely operable. A lid body 28 is fixed to the lid body 28 via mounting bolts 29. A rod-shaped screw body 30 is fixed together with a pin 31 concentrically with the frame body 27. I'm being kicked.

[0014] The threaded portion 30a formed on the outer periphery of the threaded body 30 has an end portion of the die body 3. A cylindrical bolt 12 is screwed into a screw hole 3Aa formed in 3A, By screwing in the cylindrical bolt 12, the cylindrical case is inserted through the screw body 30 and the lid body 28. 21 can be pushed in the direction of arrow B.

[0015] Note that the piece body 27 is spaced apart from the screw body 30 by a slight distance, and , because it is screwed onto the lid body 28, by rotating the top body 27, the top body 27 can be moved and the initial load can be changed, and this piece body 27 can be moved at the same time. It can also be provided in the lid 28 on the body.

[0016] In addition, gas supply pipes 4 are provided in the mounting holes 40 formed at both ends of the cylindrical case 21. 1 supply section 41a is connected, and gas from the supply inlet 41b of this gas supply pipe 41 is connected. 42 is configured to be supplied into the cylindrical case 21. Furthermore, this cylindrical shape At the center of the case 21, there is a hole for discharging the gas 42 corresponding to each of the spacers 24. A discharge hole 43 is formed for the purpose of discharging the water.

[0017] The piezoelectric element unit for die lip adjustment according to the present invention is constructed as described above. The operation will be explained below. First, since the piezoelectric element 9 has a small amount of elongation, the gap between the lips 2 can be adjusted manually by manual operation. Although it is necessary to adjust T, in the above configuration, the piezoelectric element 9 is biased by the spring member 26. and is pressed by the top body 27 of the lid body 28. An initial load is applied to the child 9.

[0018] In the above-mentioned state, when the cylindrical bolt 12 is rotated in the pushing direction, the screw body 30 and the lid body The cylindrical case 21 advances in the direction B via the lever 28, and the flexible lip 7 is pushed. The spacing T between the lips 2 can be adjusted. As described above, rotate the cylindrical bolt 12 to move the cylindrical case 21 itself in the axial direction. Since the lip 2 is roughly adjusted by The initial load applied to the electronic element 9 can always be kept constant.

[0019] Next, when a driving voltage of, for example, 200V is applied to the piezoelectric element 9, the piezoelectric element 9 is extended by approximately 400 μm, only the protruding portion 25 extends forward independently of the case tip 22. The flexible lip 7 is pushed by 400 μ and the distance T between the lips 2 is It can be made narrower.

[0020] After the distance T between the lips 2 is set as described above, the temperature of the die body 3 is increased. The molten resin is supplied from inlet 1 and extruded from lip 2 to form a sheet-like molded product. In this case, gas 42 is introduced into the cylindrical case 21 through the gas supply pipe 41. Since the gas 42 is supplied and exhausted from the exhaust hole 43 via the piezoelectric element 9, the piezoelectric element The die 9 is cooled by this gas 42, and even when the temperature of the die body 3 is 300°C, the temperature is about 80°C. can be maintained, and the piezoelectric element 9 can be kept below the heat-resistant temperature (120°C). .

[0021] Note that the configuration shown in FIG. 2 is another embodiment of FIG. 1, and the pressing structure of the piezoelectric element 9 in FIG. This is a simplified version of the configuration, and the same parts as in Figure 1 are given the same symbols, and their explanations are omitted. There is. In addition, the case where the case tip body 22 is separate from the cylindrical case 21 will be described. However, it goes without saying that it can be constructed in one piece.

[0022]

[Effect of the idea]

The piezoelectric element unit for die lip adjustment according to the present invention is constructed as described above. Therefore, the following effects can be obtained. The gas supplied inside the cylindrical case prevents the piezoelectric element from rising in temperature. , it is possible to maintain the temperature of the die body at a high temperature and perform highly efficient molding. In addition, the initial load of the piezoelectric element is determined by the case tip provided in the cylindrical case 21, This is set by the lip member and lid body, so when adjusting the lip manually, In this case, the initial load of the piezoelectric element is not affected by any adverse effects, and the initial load is always stable. Load can be obtained, and the lip can be adjusted with high precision due to the high precision operation of the piezoelectric element. I can.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a piezoelectric element unit for die lip adjustment according to the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIG. 3 is a sectional view showing a conventional piezoelectric element unit for die lip adjustment.

FIG. 4 is a sectional view showing another conventional example.

[Explanation of symbols]

2 lip 3 Die body 3Aa screw hole T interval 7 Flexible lip 9 Piezoelectric element 12 Cylindrical bolt 21 Cylindrical case 22 Case tip body 25 Projection 26 Spring member 27 frame 28 Lid body 30 Screw body 41 Gas supply pipe 43 Discharge hole

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric element unit for die lip adjustment, which presses a flexible lip (7) provided on a die body (3) to adjust the interval (T) between the lips (2), wherein the die body (3) ), a piezoelectric element (9) provided within the cylindrical case (21), and a piezoelectric element (9) provided within the cylindrical case (21); and a discharge hole (43) provided in the cylindrical case (21) for discharging the gas, the piezoelectric element (9) is provided with a gas supply pipe (41) for supplying gas to A piezoelectric element for die lip adjustment, characterized in that it is configured to be cooled by.