Pressure detection device and extrusion molding device equipped with pressure detection device

Abstract

To provide a pressure detector capable of preventing deterioration of pressure detection accuracy on clayey slurry, and an extrusion molding device equipped with the pressure detector.SOLUTION: A pressure detector 5 detects pressure clayey slurry flowing into an extrusion molding device. The pressure detector 5 includes a passive member 25 for receiving pressure of the clayey slurry and a load sensor 26 for detecting a force applied to the passive member 25. The passive member 25 has a contact area 41 that contacts the clayey slurry.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pressure detection device and an extrusion molding device equipped with a pressure detection device. [Background technology]

[0002] Extrusion molding is a known method for manufacturing ceramic building materials. In this method, a clay slurry is extruded from a mold in an extrusion molding device to form a clay molded product. The clay molded product is cut into pieces of a predetermined length and then cured by heat. To control the quality of the clay molded product, the pressure of the clay slurry is measured in the extrusion molding device (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 06-270116 Summary of the Invention [Problem to be solved by the invention]

[0004] Clay slurry contains aggregate, which causes wear on the pressure sensor. When the pressure sensing surface of the pressure sensor is worn, the accuracy of pressure detection may decrease. [Means for solving the problem]

[0005] (1) A pressure detection device that solves the above problem is a pressure detection device that detects the pressure of a clayey slurry flowing into an extrusion molding device, and includes a passive member that receives the pressure of the clayey slurry and a load sensor that detects the force applied to the passive member, and the passive member has a contact surface that contacts the clayey slurry. With this configuration, the load sensor does not receive the pressure of the clayey slurry directly, but receives the pressure of the clayey slurry via the passive member. This makes it possible to suppress a decrease in detection accuracy for the pressure of the clayey slurry.

[0006] (2) In the pressure detection device of (1), the extrusion molding device has a passage through which the clayey slurry flows, and the passive member is slidably provided in a through-hole that penetrates a peripheral wall of the passage. With this configuration, the pressure of the clayey slurry in the passage of the extrusion molding device can be detected.

[0007] (3) The pressure detection device of (2) above further includes a support part that slidably supports the passive member, and the support part is configured to be detachable from the extrusion molding device so as to form a part of the peripheral wall of the passage part of the extrusion molding device. With this configuration, the pressure detection device can be easily removed from the extrusion molding device, making it easy to perform maintenance on the pressure detection device.

[0008] (4) In the pressure detection device of any one of (1) to (3), the passive member has a main body having the contact surface, and the main body has an engaging portion that engages with a member that supports the passive member. With this configuration, the passive member is prevented from falling off into the extrusion molding device.

[0009] (5) In the pressure detection device of any one of (1) to (4) above, the load sensor includes a load cell having a strain gauge. With this configuration, the force received by the load sensor can be output as an electric signal.

[0010] (6) In the pressure detection device of any one of (1) to (5), the passive member has a pressing surface that transmits a force to the load sensor, and the pressing surface is configured to be perpendicular to the central axis of the passive member. With this configuration, compared to when the pressing surface intersects the central axis obliquely, the force received by the passive member can be prevented from being transmitted to parts other than the load sensor, and the force received by the passive member can be accurately measured by the load sensor.

[0011] (7) An extrusion molding apparatus that solves the above problems includes the pressure detection device according to any one of (1) to (5). With this configuration, it is possible to suppress a decrease in detection accuracy for the pressure of the clayey slurry. [Effects of the Invention]

[0012] According to the pressure detection device and extrusion molding device of the present disclosure, it is possible to suppress a decrease in detection accuracy for the pressure of the clayey slurry. [Brief explanation of the drawings]

[0013] [Figure 1] Schematic diagram of an extrusion molding device. [Figure 2] FIG. [Figure 3] 3 is a cross-sectional view of the support portion taken along line 3-3 in FIG. 2. [Figure 4] Enlarged view of part A in Figure 2. [Figure 5] FIG. 10 is a front view of a modified example of the support portion of the pressure detection device. [Figure 6] FIG. 10 is a schematic diagram of a first modified example of an extrusion molding device. [Figure 7] FIG. 10 is a schematic diagram of a second modified example of the extrusion molding device. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Extrusion molding equipment> An extrusion molding apparatus 1 will be described with reference to Figure 1. The extrusion molding apparatus 1 is used to mold ceramic building materials. Examples of ceramic building materials include exterior wall panels for buildings, interior wall panels, flooring materials, roofing tiles, roofing materials, and exterior panels.

[0015] Ceramic building materials are manufactured as follows: A clay slurry is made by kneading raw materials. The clay slurry is fed into an extrusion molding device 1. A sheet-shaped clay molded product 90 is then extruded from the extrusion molding device 1. The sheet-shaped clay molded product 90 is transported by a belt conveyor 91. The sheet-shaped clay molded product 90 is cut to a predetermined length by a cutter. The clay molded product 90 of the predetermined length is heat cured. In this way, the ceramic building material is completed.

[0016] The clayey slurry contains cement, aggregate, resin material, and water. Examples of cement include Portland cement and alumina cement. Examples of aggregate include clay, silica stone, silica sand, feldspar, pottery stone, silica, alumina, and ceramic waste. Examples of resin material include polyvinyl alcohol, carboxymethyl cellulose, methyl cellulose, dextrin, and starch.

[0017] The clayey slurry may contain glass powder. Examples of the glass powder include soda glass, soda lime glass, borosilicate glass, alumina silicate glass, borate glass, and phosphate glass. The clayey slurry may contain fibrous materials. Examples of the fibrous materials include glass fibers, pulp fibers, and polypropylene fibers.

[0018] The extrusion molding device 1 extrudes a clayey slurry. The extrusion molding device 1 includes an inlet 2 into which the clayey slurry is introduced, an extrusion section 3 that extrudes the introduced clayey slurry, a passage section 4 downstream of the extrusion section 3, and a pressure detection device 5.

[0019] The extrusion section 3 is provided with a screw 10. The clayey slurry is extruded toward the passage section 4 by the rotation of the screw 10. The extrusion section 3 may be provided with a plunger that pushes the clayey slurry instead of the screw 10. The clayey slurry flows toward the outlet 6 in the passage section 4.

[0020] The passage section 4 is a section through which the clayey slurry extruded by the extrusion section 3 flows. The passage section 4 includes an extension section 11 extending from the extrusion section 3, an intermediate passage section 12 directly or indirectly connected to the extension section 11, and a mold 13. The mold 13 is provided at the downstream end of the intermediate passage section 12. The mold 13 is directly or indirectly connected to the intermediate passage section 12.

[0021] The intermediate passage portion 12 includes a cylindrical body 20, a first flange 21 provided at the upstream end of the body 20, and a second flange 22 provided at the downstream end of the body 20. The first flange 21 is connected directly or indirectly to a flange 15 of the extension portion 11. The second flange 22 is connected directly or indirectly to a flange 16 of the mold 13.

[0022] The mold 13 is provided with an outlet 6 through which the clay slurry comes out. The outlet 6 is configured to have a shape that matches the cross-sectional shape of the clay molded product 90. The cross-sectional shape of the clay molded product 90 is determined by the shape of the outlet 6 of the mold 13. The cross-sectional shape of the clay molded product 90 refers to the shape of a cross section when the clay molded product 90 is cut along a plane perpendicular to the direction DT in which the clay molded product 90 moves out of the extrusion molding device 1.

[0023] <Pressure detection device> The pressure detection device 5 will be described with reference to FIGS. 2 to 4. The pressure detection device 5 is arranged downstream of the extrusion section 3 in the clayey slurry flow path in the extrusion molding apparatus 1. In one example, the pressure detection device 5 is provided in the passage section 4. The pressure detection device 5 may also be provided in the extension section 11 extending from the extrusion section 3. The pressure detection device 5 may also be provided in the intermediate passage section 12. The pressure detection device 5 may also be provided in the mold 13. The pressure detection device 5 may also be provided between the extrusion section 3 and the intermediate passage section 12. The pressure detection device 5 may also be provided between the intermediate passage section 12 and the mold 13. In this embodiment, the pressure detection device 5 is provided between the extrusion section 3 and the intermediate passage section 12.

[0024] The pressure detection device 5 detects the pressure of the clayey slurry. The pressure detection device 5 includes a passive member 25 and a load sensor 26. In one example, the pressure detection device 5 further includes a support portion 27.

[0025] The support portion 27 slidably supports the passive member 25. The support portion 27 is configured to be detachable from the extrusion molding device 1 so as to form part of the peripheral wall 4A of the passage portion 4 of the extrusion molding device 1. The peripheral wall 4A is defined as a wall that circumferentially surrounds a line along the direction of the flow of the clayey slurry.

[0026] 2, the support portion 27 is configured in a ring shape. The support portion 27 is disposed between the flange 15 of the extension portion 11 of the extrusion portion 3 and the first flange 21 of the intermediate passage portion 12, and is configured to be sandwiched between the flange 15 and the first flange 21. The support portion 27 is fixed to the flange 15 of the extension portion 11 by a first bolt, and is further fixed to the first flange 21 by a second bolt. With this arrangement, the support portion 27 forms a part of the passage portion 4.

[0027] A through hole 30 is provided in the support portion 27. The through hole 30 extends along a radial direction DR relative to a central axis CA of the support portion 27. The passive member 25 is inserted into the through hole 30. The through hole 30 has a first through portion 31 and a second through portion 32 connected to the first through portion 31. The first through portion 31 preferably has a circular cross section. The second through portion 32 preferably has a circular cross section. The second through portion 32 shares a central axis CB with the first through portion 31. The central axis CB is perpendicular to the central axis CA. The second through portion 32 extends radially outward from the first through portion 31. The diameter of the second through portion 32 (hereinafter referred to as the second diameter) is larger than the diameter of the first through portion 31 (hereinafter referred to as the first diameter). A first step surface 33 is provided at the joint between the first through portion 31 and the second through portion 32 (see FIG. 4).

[0028] As shown in FIG. 3, the support portion 27 has a protrusion 35 and a recess 36. The protrusion 35 is provided on a first surface 27A facing the flange 15 of the extension portion 11 of the extrusion portion 3. The protrusion 35 is circular when the support portion 27 is viewed from the front (see FIG. 2). The protrusion 35 protrudes toward the flange 15 of the extension portion 11 when the support portion 27 is disposed between the flange 15 of the extension portion 11 of the extrusion portion 3 and the first flange 21 of the intermediate passage portion 12 (see FIG. 1). The protrusion 35 is configured to fit into a circular fitting recess provided in the flange 15 of the extension portion 11. This positions the support portion 27 with respect to the extension portion 11 of the extrusion portion 3.

[0029] The recess 36 is provided on the second surface 27B facing the first flange 21 of the intermediate passage portion 12. When the support portion 27 is disposed between the flange 15 of the extension portion 11 of the extrusion portion 3 and the first flange 21 of the intermediate passage portion 12 (see FIG. 1 ), the recess 36 is recessed in a direction away from the first flange 21. The recess 36 is configured so that a circular protrusion provided on the first flange 21 fits into it. This positions the support portion 27 with respect to the first flange 21 of the intermediate passage portion 12.

[0030] <Passive components> The passive member 25 is slidably mounted in a through hole 30 that penetrates the peripheral wall 4A of the passage portion 4. The passive member 25 receives the pressure of the clayey slurry. The passive member 25 transmits the pressure of the clayey slurry to the load sensor 26. The passive member 25 is configured as a rigid body. The passive member 25 may be configured by a single member or by connecting multiple members. The passive member 25 transmits the force received from the clayey slurry to the load sensor 26 by movement. The force received by the passive member 25 is expressed as the product of the pressure of the clayey slurry and a contact surface 41 (see below).

[0031] The passive member 25 has a main body 40. The main body 40 is configured like a shaft having a central axis CC. The passive member 25 is inserted into the through hole 30 so that the central axis CC overlaps the central axis CB of the through hole 30. The passive member 25 is provided movably along the central axis CC of the passive member 25. The passive member 25 has a contact surface 41 that contacts the clayey slurry. The passive member 25 has a pressing surface 42 that transmits force to the load sensor 26. The contact surface 41 is provided at one end of the main body 40. The pressing surface 42 is provided at the end opposite to the one end of the main body 40. The contact surface 41 is configured to be perpendicular to the central axis CC. The pressing surface 42 is provided to be perpendicular to the central axis CC.

[0032] The main body 40 has an engaging portion 43 that engages with the pressure detection device 5. The engaging portion 43 is configured to engage with a first step surface 33 provided in the through hole 30. In one example, the main body 40 has a first shaft portion 45 that is inserted into the first through portion 31 and a second shaft portion 46 that is inserted into the second through portion 32. A step surface (hereinafter, referred to as the second step surface 47) is provided on the end surface of the second shaft portion 46 to which the first shaft portion 45 is connected. The second step surface 47 is configured to be perpendicular to the central axis CC. The engaging portion 43 includes the second step surface 47. The passive member 25 is prevented from moving inward in the passage portion 4 by the second step surface 47 of the passive member 25 coming into contact with the first step surface 33 of the through hole 30.

[0033] The dimensions of the first shaft portion 45 and the first penetrating portion 31 are set as follows: The dimensions of the first shaft portion 45 and the first penetrating portion 31 are set so that the passive member 25 can slide when the first shaft portion 45 is inserted into the first penetrating portion 31, and so that aggregate of the clayey slurry does not get between the first shaft portion 45 and the first penetrating portion 31.

[0034] In one example, the diameter of the first shank 45 is set to a predetermined length greater than 10 mm and equal to or less than 18 mm. In this case, the diameter of the first shank 45 is formed to satisfy a fit tolerance of JIS h6 from one end to the other of the first shank 45. The diameter of the first penetrating portion 31, through which the first shank 45 is inserted, is formed to satisfy a fit tolerance of JIS H7 from one end to the other of the first penetrating portion 31.

[0035] For example, the passive member 25 is made of general structural rolled steel or mechanical structural carbon steel. In one example, the passive member 25 is made of SS material or SC material specified by JIS. The passive member 25 may be made of alloy tool steel. In one example, the passive member 25 is made of SKS, SKD, or SKT material specified by JIS. By making the passive member 25 of alloy tool steel, wear of the contact surface 41 is suppressed.

[0036] <Load sensor> The load sensor 26 detects the force applied to the passive member 25. The load sensor 26 includes a load cell 50.

[0037] As shown in FIG. 4, the load cell 50 includes a flexure element 51 and a case 52 that holds the flexure element 51. A strain gauge 51A is provided on the flexure element 51. The strain gauge 51A outputs an electrical signal corresponding to the deformation of the flexure element 51. The load cell 50 outputs the signal from the strain gauge 51A as an output signal. The flexure element 51 is provided with a contact 53 that is pressed by the passive member 25. The load cell 50 is positioned relative to the support part 27 so that the pressing surface 42 of the passive member 25 comes into contact with the contact 53 of the load cell 50. The load cell 50 is fixed to the support part 27 by a fixing member 55.

[0038] The fixing member 55 includes a first fixing member 56 fixed to the support portion 27, and a second fixing member 57 that supports the load cell 50. The first fixing member 56 has a through hole 56A through which the passive member 25 passes. Two bolts 58 are attached to the first fixing member 56. The second fixing member 57 is fixed to the two bolts 58 with nuts 59. The second fixing member 57 is fixed so that the contacts 53 of the load cell 50 come into contact with the pressing surface 42 of the passive member 25. The position of the second fixing member 57 is adjusted by adjusting the position of the nuts 59 relative to the bolts 58.

[0039] <Conversion tool> A conversion tool may be created to convert the output value of the pressure detection device 5. The conversion tool is a tool that correlates the output value of the load sensor 26 with a measurement value measured by a standard pressure sensor. For example, a diaphragm type pressure gauge is used as the standard pressure sensor.

[0040] The values ​​for creating the conversion tool are measured as follows: The standard pressure sensor directly measures the pressure of the clayey slurry. The standard pressure sensor is fixed to the passage 4 of the extrusion molding apparatus 1 so that the test surface of the standard pressure sensor contacts the clayey slurry. The pressure detection device 5 is fixed at the same position as the standard pressure sensor in the direction in which the clayey slurry flows. In one example, the pressure detection device 5 is fixed at a position facing the standard pressure sensor in the radial direction DR in the passage 4. After fixing the standard pressure sensor and the pressure detection device 5 to the extrusion molding apparatus 1 in this way, the pressure of the clayey slurry is measured simultaneously by the standard pressure sensor and the pressure detection device 5. A conversion tool is created based on the data obtained in this way. The conversion tool allows the output value output from the pressure detection device 5 to be easily converted into a value detected by the standard pressure sensor.

[0041] <effect> The operation of this embodiment will be described. The pressure of the clay slurry in the passage 4 varies depending on various factors. For example, the pressure of the clay slurry varies depending on the rotation speed of the screw 10, the room temperature and humidity of the room where the extrusion molding device 1 is installed, the composition of the clay slurry, and the viscosity of the clay slurry. The degree of filling of the clay molded product 90 or the distribution of the degree of filling within the clay molded product 90 affects the yield of ceramic building materials. The degree of filling indicates the amount of clay slurry per unit volume. A clay molded product 90 with a large amount of unfilled clay slurry is evaluated as having a low degree of filling. A clay molded product 90 with a small amount of unfilled clay slurry is evaluated as having a high degree of filling. The degree of filling of the clay molded product 90 or the distribution of the degree of filling within the clay molded product 90 is believed to be related to the pressure of the clay slurry in the passage 4 of the extrusion molding device 1. Therefore, the pressure of the clay slurry in the passage 4 of the extrusion molding device 1 is useful for evaluating the quality of ceramic building materials.

[0042] The pressure of the clayey slurry is detected by a pressure sensor. Conventionally, the pressure detection surface of the pressure sensor is in contact with the clayey slurry. Because clayey slurry contains aggregate, the pressure detection surface gradually wears away due to the flow of the clayey slurry. In particular, the pressure detection surface is prone to scratches in clayey slurries with low water content. When the pressure detection surface wears or is scratched, it becomes deformed, which results in a decrease in the accuracy of detecting the pressure of the clayey slurry.

[0043] According to this embodiment, the pressure detection device 5 includes a passive member 25 and a load sensor 26 that detects a force applied to the passive member 25. The pressure of the clayey slurry is received by the passive member 25. The load sensor 26 does not directly measure the pressure of the clayey slurry. The clayey slurry does not come into contact with the contact point 53 of the load sensor 26. This prevents the contact point 53 of the load sensor 26 from being deformed due to wear caused by contact with the clayey slurry. In this way, a decrease in detection accuracy for the pressure of the clayey slurry can be prevented.

[0044] The effects of this embodiment will be described. (1) The pressure detection device 5 includes a passive member 25 that receives the pressure of the clayey slurry, and a load sensor 26 that detects the force applied to the passive member 25. The passive member 25 has a contact surface 41 that comes into contact with the clayey slurry. According to this configuration, the load sensor 26 does not receive the pressure of the clayey slurry directly, but receives the pressure of the clayey slurry via the passive member 25. This makes it possible to suppress a decrease in the detection accuracy of the pressure of the clayey slurry.

[0045] (2) The passive member 25 is slidably provided in the through-hole 30 that penetrates the peripheral wall 4A of the passage portion 4. With this configuration, the pressure of the clayey slurry in the passage portion 4 of the extrusion molding device 1 can be detected.

[0046] (3) The pressure detecting device 5 further includes a support portion 27 that slidably supports the passive member 25. The support portion 27 is configured to be detachable from the extrusion molding apparatus 1 so as to form part of the peripheral wall 4A of the passage portion 4. With this configuration, the pressure detecting device 5 can be easily removed from the extrusion molding apparatus 1, facilitating maintenance of the pressure detecting device 5.

[0047] (4) The passive member 25 has a main body 40 having a contact surface 41. The main body 40 has an engaging portion 43 that engages with a member that supports the passive member 25. In this embodiment, the member that supports the passive member 25 is the support portion 27. This configuration prevents the passive member 25 from falling off into the extrusion molding device 1.

[0048] (5) In the pressure detection device 5, the load sensor 26 includes a load cell 50. The load cell 50 has a strain gauge 51A. With this configuration, the force received by the load sensor 26 can be output as an electric signal.

[0049] (6) The pressing surface 42 of the passive member 25 is configured to be perpendicular to the central axis CC of the passive member 25. With this configuration, compared to when the pressing surface 42 intersects the central axis CC at an angle, the force received by the passive member 25 can be prevented from being transmitted to parts other than the load sensor 26, and therefore the force received by the passive member 25 can be accurately measured by the load sensor 26.

[0050] (7) The extrusion molding device 1 includes the above-described pressure detection device 5. This configuration can prevent a decrease in detection accuracy for the pressure of the clayey slurry.

[0051] <Modification> The above-described embodiment is an example of a form that the pressure detection device 5 and the extrusion molding device 1 can take, and is not intended to limit the form. The pressure detection device 5 and the extrusion molding device 1 can take forms different from those exemplified in the above-described embodiment. Examples of such forms include a form in which part of the configuration of the embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to the embodiment. An example of a modified example of the embodiment is shown below.

[0052] As shown in FIG. 5, the support portion 27 of the pressure detection device 5 may have an inner circumferential member 61 and an outer circumferential member 62 disposed outside the inner circumferential member 61. The inner circumferential member 61 is configured to fit inside the outer circumferential member 62. The inner circumferential member 61 and the outer circumferential member 62 are made of iron material. Preferably, the inner circumferential member 61 is made of a material harder than the outer circumferential member 62. For example, the inner circumferential member 61 is made of SKS, SKD, or SKT as specified in JIS. The outer circumferential member 62 is made of SS400 as specified in JIS.

[0053] The arrangement of the pressure detection device 5 in the extrusion molding apparatus 1 is not limited to the example of the embodiment. The pressure detection device 5 may be arranged downstream of the extrusion section 3 in the clayey slurry flow path in the extrusion molding apparatus 1, and may be provided at a position different from that in the example of the embodiment.

[0054] For example, as shown in FIG. 6 , the pressure detection device 5 may be provided in the mold 13. In this case, the support portion 27 is omitted. The passive member 25 is supported by the mold 13. The mold 13 is provided with a through hole 30 through which the passive member 25 is inserted. The passive member 25 is attached to the mold 13 so as to be slidable in the through hole 30. The engagement portion 43 of the passive member 25 is configured to engage with the mold 13.

[0055] As shown in FIG. 7 , the passive member 25 may be configured to be supported by the body 20 of the passage portion 4 of the extrusion molding apparatus 1. In this case, the support portion 27 of the pressure detection device 5 may be omitted. The passive member 25 is supported by the body 20 and the first fixing member 56. A through hole 30 is provided in the body 20. The passive member 25 is attached to the body 20 so as to slide into the through hole 30. The engagement portion 43 of the passive member 25 is configured to engage with the outer peripheral surface of the body 20 of the passage portion 4.

[0056] In the above embodiment, the engaging portion 43 of the passive member 25 is configured to engage with the second stepped surface 47 provided in the through hole 30. However, the object of engagement of the engaging portion 43 is not limited to this. As shown in FIG. 7 , the engaging portion 43 may be configured to engage with the outer peripheral surface of the body 20. The engaging portion 43 may be configured to engage with the first fixing member 56. [Explanation of symbols]

[0057] 1...Extrusion molding device 4...Aisle section 4A…Peripheral wall 5...Pressure detection device 25... Passive component 26...Load sensor 27...Support part 30...Through hole 40...Main body 41…Contact surface 43...Engagement portion 50...load cell

Claims

1. A pressure detection device for detecting the pressure of a clayey slurry flowing into an extrusion molding device, A passive member that receives the pressure of the clayey slurry and a load sensor that detects the force applied to the passive member are provided, The extrusion molding device has a passage through which the clayey slurry flows, The passive member is It consists of rigid bodies, A contact surface that contacts the clayey slurry, The valve is slidably provided in a through hole that penetrates a peripheral wall of the passage portion, And it is made of general structural rolled steel, mechanical structural carbon steel or alloy tool steel. Pressure detection device.

2. a support portion that slidably supports the passive member, the support portion is configured to be detachable from the extrusion molding device so as to form a part of the peripheral wall of the passage portion of the extrusion molding device. The pressure detection device according to claim 1 .

3. the passive member has a main body portion having the contact surface, and the main body portion has an engaging portion that engages with a member that supports the passive member. The pressure detection device according to claim 1 or 2.

4. The load sensor includes a load cell having a strain gauge. The pressure detection device according to any one of claims 1 to 3.

5. The passive member has a pressing surface that transmits a force to the load sensor, and the pressing surface is configured to be perpendicular to the central axis of the passive member. The pressure detection device according to any one of claims 1 to 4.

6. An extrusion molding apparatus equipped with a pressure detection device described in any one of claims 1 to 5.

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