JPH11221843A - Structure of thermo-couple fitting part in heating cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure an accurate temperature of a heating cylinder by sufficiently securing a depth of a thermo-couple inserting hole in which a tip part of the thermocouple is to be inserted in an adhered state. SOLUTION: In a heating cylinder 1, a thermo-couple inserting hole 2 is bored toward an inner wall surface 1b from an outer wall surface 1a by being communicated to a through hole 3a formed to a heating means 3. One end side of a cylindrical thermo-couple receiving member 7 is fixed to a top 4a of a rest 4 fixed to an outer surface of the heating means 3, and a coil spring 9 is fitted to the other end side via a fitting member 8. Then, for the thermo-couple 5. Its tip part 5 is inserted in an adhesion state into the thermo-couple inserting hole 2, and an appropriate part of the other end side is fixed to a coil spring 9 where in a tensile force is given between that and a fitting member 8 with a spring fixing tool 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a thermocouple mounting portion in a heating cylinder for mounting a thermocouple for temperature measurement on a temperature measuring portion of a heating cylinder in an injection molding machine, an extrusion molding machine, or the like. is there.

[0002]

2. Description of the Related Art An example of the structure of a thermocouple mounting portion in a conventional heating cylinder will be described.

As shown in FIG. 4, a screw hole 10 for mounting a thermocouple receiving member 104 extending from an outer wall surface 101a to an inner wall surface 101b is provided at a temperature measuring portion of a heating cylinder 101.
2 and a thermocouple insertion hole 103 smaller in diameter than the screw hole 102 from the bottom of the screw hole 102 toward the inner wall surface 101b.

A cylindrical thermocouple receiving member 104, one end of which is screwed into a screw hole 102 of a heating cylinder 101, has an inner diameter larger than the outer diameter of the thermocouple 105. An engagement protrusion 104a protruding in the direction is provided.

A coil spring 107 mounted on the thermocouple 105 has a mounting member 108 fixed to one end thereof, and a ring-shaped spring fixing tool 109 inserted into an appropriate portion on the other end. By tightening the screw 110, the portion between the mounting member 108 and the spring fixture 109 is fixed to the thermocouple 105 in a state where a tensile force is applied.

Then, after inserting the thermocouple 105 through the thermocouple receiving member 104 attached to the heating cylinder 101 with the distal end portion 106 in close contact with the thermocouple insertion hole 103, the mounting member 108 is inserted into the thermocouple receiving member 104. The thermocouple receiving member 104 is fitted into the engagement slit 108a.
Are attached to the heating cylinder 101 with the pressing force in the direction of the arrow generated by the resilient force of the coil spring 107 being applied to the thermocouple 105 by engaging the engaging projections 104a.

[0007]

In the above prior art,
A thermocouple insertion hole is drilled following a screw hole for screwing a thermocouple receiving member to the heating cylinder, and a thermocouple tip (temperature-sensitive portion) is inserted into the thermocouple insertion hole. It is inevitable that a non-contact area S is formed by a screw hole having an inner diameter larger than the outer diameter of the pair, and the length (depth) of the contact area L where the thermocouple contacts the heating cylinder is measured accurately. It is not possible to secure a length of 10 times or more the outer diameter of the thermocouple, which is said to be necessary for performing the above. In addition, since there is a gap between the thermocouple receiving member and the thermocouple in the heating cylinder, there is a problem that the temperature field at this portion is disturbed and accurate temperature measurement cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has a structure in which the depth of a thermocouple insertion hole into which the tip of a thermocouple is fitted in a close contact state is sufficiently ensured. It is an object of the present invention to realize a structure of a thermocouple mounting portion in a heating cylinder that can accurately measure the temperature of the heating cylinder.

[0009]

In order to achieve the above object, a structure of a thermocouple mounting portion in a heating cylinder according to the present invention has a structure in which a temperature measuring portion of the heating cylinder is perforated from an outer wall surface to an inner wall surface. A thermocouple insertion hole, a gantry fixed to the outer wall surface side of the heating cylinder, a cylindrical thermocouple receiving member having one end fixed to the gantry, and a mounting member attached to the other end of the thermocouple receiving member. And a thermocouple whose tip is inserted into the thermocouple insertion hole in close contact with the other end and penetrates the coil spring through the thermocouple receiving member and the mounting member. An appropriate portion of the coil spring is fixed to the thermocouple by a spring fixing tool in a state where a tensile force is applied between the coil spring and the mounting member.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic partial sectional view showing a structure of a thermocouple mounting portion in a heating cylinder according to the first embodiment.

In this embodiment, the heating cylinder 1
Is configured to be heated by a heating means 3 such as a band heater provided on the outer wall surface 1a.
A through hole 3a formed in the heating means 3 is provided at the temperature measuring portion.
A thermocouple insertion hole 2 into which a distal end portion (temperature sensing portion) 6 of the thermocouple 5 is inserted in a tight contact state is formed from the outer wall surface 1a to the inner wall surface 1b.

One end of a cylindrical thermocouple receiving member 7 having an inner diameter larger than the outer diameter of the thermocouple 5 is provided on the top plate 4a of the gantry 4 fixed to the outer surface of the heating means 3 by welding means or the like. An engagement projection 7a that projects outward in the radial direction is provided at a position near the other end of the thermocouple receiving member 7 and is fixed by fixing means such as welding.

Coil spring 9 mounted on thermocouple 5
The cap-shaped mounting member 8 is fixed to one end side, and the set screw 11 of the ring-shaped spring fixing tool 10 inserted into an appropriate portion on the other end side is tightened to fix the mounting member 8 and the spring. The portion between the components 10 is fixed to the thermocouple 5 in a state where a tensile force is applied.

The thermocouple 5 passes through the inner diameter portion of the thermocouple receiving member 7 fixed to the gantry 4, the through hole 4b formed in the top plate 4a, and the through hole 3a formed in the heating means 3, and the tip end thereof. After the part 6 is fitted in the thermocouple insertion hole 2 of the heating cylinder 1 in a state of close contact, the mounting member 8 is fitted to the thermocouple receiving member 7, and the engaging projection of the thermocouple receiving member 7 is inserted into the engaging slit 8 a. The thermocouple 5 is detachably attached to the thermocouple 5 by applying the pressing force in the direction of the arrow generated by the resilient force of the coil spring 9 by engaging and integrating the 7a.

In the present embodiment, the thermocouple insertion hole 2 into which the distal end portion 6 of the thermocouple 5 is fitted in close contact can be made deep enough to accurately measure the temperature. Since there is no gap that disturbs the temperature field of the heating cylinder as in the technique described in the above technique, accurate and responsive measurement of the temperature of the heating cylinder is possible.

FIG. 2 is a schematic partial sectional view showing a structure of a thermocouple mounting portion in a heating cylinder according to a second embodiment.

This embodiment is applied to a case where a portion of the heating cylinder 1 where the heating means is not provided is used as a temperature measuring section. Hereinafter, a first embodiment shown in FIG. 1 will be described. Portions that may be the same as those described above are denoted by the same reference numerals, and description thereof will be omitted.

A mounting plate 21 in the form of a flange is fixed to the gantry 4 by fixing means such as welding or the like. Bolts 22 respectively fitted into a plurality of through holes 21 a formed in the mounting plate 21 are attached to the heating cylinder 1. By screwing into the formed screw hole 1c, it is configured to be detachably fixed to the outer wall surface 1a of the heating cylinder 1.

FIG. 3 is a schematic sectional view showing a structure of a thermocouple mounting portion in a heating cylinder according to a third embodiment.

The present embodiment is also applied to a case where a portion of the heating cylinder 1 where the heating means is not provided is used as a temperature measuring section. Hereinafter, the first embodiment shown in FIG. 1 will be described. Portions that may be the same as those described above are denoted by the same reference numerals, and description thereof will be omitted.

The gantry 4 is fixed to a substantially central portion of the annular fastening band 31 by fastening means such as welding, and the fastening band 31 is wound around the outer wall surface 1a of the heating cylinder 1 and provided integrally at both ends thereof. The fastening portions 31 a and 31 b are configured to be removably fixed to the outer wall surface 1 a of the heating cylinder 1 by fastening the fastening portions 31 a and 31 b with the fastening bolts 32.

In this embodiment, the heating cylinder 1
It is only necessary to form the thermocouple insertion hole 2 for fitting the distal end portion 6 of the thermocouple 5 in close contact with the outer wall surface of the thermocouple 5, so that the thermocouple can be easily attached to an existing heating cylinder.

In the present invention, the engaging projection 7a protruding from the thermocouple receiving member 7 as described in each of the above embodiments is engaged with the engaging slit provided on the cap-shaped mounting member 8. It is not limited to one that combines
A cap nut-shaped mounting member is fixed to one end of the coil spring, and this mounting member is changed to one that is integrated by screwing it into a male thread formed on the outer surface of the free end side of the thermocouple receiving member. can do.

Further, in order to facilitate the axial alignment between the through hole 4b of the gantry 4 and the through hole 3a of the heating means 3 and the thermocouple 5, the gantry 4 is fixed not by welding or other fixing means but by bolts and lengths. It is possible to change to a fixing means that can be freely positioned using holes.

[0026]

Since the present invention is configured as described above, the following effects can be obtained.

The thermocouple insertion hole extending from the outer wall surface to the inner wall surface formed in the heating cylinder can have a sufficient depth, and since there is no gap in the heating cylinder that disturbs the temperature field, accurate and responsiveness can be obtained. Good temperature measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view showing a structure of a thermocouple mounting portion in a heating cylinder according to a first embodiment.

FIG. 2 is a schematic partial cross-sectional view showing a structure of a thermocouple mounting portion in a heating cylinder according to a second embodiment.

FIG. 3 is a schematic cross-sectional view in a radial direction of a heating cylinder, showing a structure of a thermocouple mounting portion in the heating cylinder according to a third embodiment.

FIG. 4 is a schematic partial cross-sectional view showing a structure of a thermocouple mounting portion in a conventional heating cylinder.

[Explanation of symbols]

 Reference Signs List 1 heating cylinder 1a outer wall surface 1b inner wall surface 1c screw hole 2 thermocouple insertion hole 3 heating means 3a, 4b, 21a through hole 4 gantry 4a top plate 5 thermocouple 6 thermocouple tip 7 thermocouple receiving member 7a engagement protrusion 8 Mounting member 8a Engagement slit 9 Coil spring 10 Spring fixing tool 11 Set screw 21 Mounting plate 22 Bolt 31 Fastening band 31a, 31b Fastening portion 32 Fastening bolt

Claims (1)

[Claims] 1. A thermocouple insertion hole (2) drilled from an outer wall surface (1a) to an inner wall surface (1b) in a temperature measuring portion of a heating cylinder (1), and fixed to an outer wall surface side of the heating cylinder. A pedestal (4), a cylindrical thermocouple receiving member (7) having one end fixed to the gantry, and a coil attached to the other end of the thermocouple receiving member via an attaching member (8). A thermocouple (5) having a spring (9) and a tip (6) fitted in the thermocouple insertion hole in close contact with the thermocouple insertion hole, and the other end penetrating the coil spring through the thermocouple receiving member and the mounting member. Wherein a proper portion of the coil spring is fixed to the thermocouple by a spring fixing tool (10) with a tensile force applied between the coil spring and the mounting member. Mounting part Structure.