CN2151858Y

CN2151858Y - Hot pressing device

Info

Publication number: CN2151858Y
Application number: CN 93215458
Authority: CN
Inventors: 崔杭妹; 宋齐生; 解燕
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-31
Filing date: 1993-05-31
Publication date: 1994-01-05
Anticipated expiration: 2003-05-31

Abstract

The utility model relates to a hot pressing device which is composed of two power source electrodes, a PTC element, an insulating outer sleeve, a heating body and a die installing hole. The utility model is characterized in that the die installing hole is arranged in a brass heating body of which the outer layer is provided with the PTC element which is connected with the two power source electrodes. Because the PTC element is used as a heat source, the heating body has the function of constant temperature, no overheating phenomenon and over current phenomenon, and no need of a temperature control device and various protection circuits. Because the volume of the heating body is small, heat inertia is small, and temperature control of which the error can reached +/-1 DEG C. has no return difference.

Description

Hot pressing device

The utility model relates to a kind of hot-press arrangement, particularly a kind of hot-press arrangement that is used on the perforating binding machine.

At present, the hot-forming heat core on the external perforating binding machine is installed in (see figure 2) in the calandria of a brassiness.Heating element heater in the calandria has been selected the element of a kind of being referred to as " fire tube " for use, fire tube is after heater strip is added insulation, resistant to elevated temperatures particular fillers, is contained in to be made in the metal tube.The preheating time of this fire tube is long, and service life is short, cost height (about dozens of yuan～200 yuan), and temperature-control circuit will be arranged, in case temperature control, the temperature of fire tube will constantly rise, and when temperature rise is too high, will cause fire tube to burn.

General temperature control is as the measuring cell (see figure 1) with bimetal leaf, then the temperature signal of measuring is sent into and carried out temperature control in the analog circuit, the temperature lag of bimetal leaf is in the temperature of calandria, and bimetal leaf itself has bigger return difference, closed temperature and break-off signal poor, make that the temperature difference of calandria is bigger, temperature difference can reach 60～70 ℃ when the most serious.

Because automatic hole punching and bookbinding machine is that hot core uses simultaneously up and down when hot pressing is bound, and two sides of plastic tube is hot-forming.Because the temperature return difference is big, the stapled cap size of hot pressing is difficult to consistent, and after having used a period of time, the physical dimension difference of cap is increasing up and down, even the influence use, and behind the temperature drift of calandria, general personnel do not possess the condition of adjustment, cannot solve.So there is following defective in prior art:

＜1〉the temperature return difference is big;＜2〉cost height;＜3〉use non-ferrous metal many, thermal inertia is big;＜4〉the life-span weak point is adjusted difficulty;＜5〉control circuit complexity;＜6〉power consumption is big, and the thermal efficiency is low;＜7〉firing rate is slow;＜8〉volume is big, weight is big.

The purpose of this utility model provides a kind of constant temperature function, the hot-press arrangement that can not produce overheated, overcurrent and can directly power.

The purpose of this utility model is achieved in that with PTC element (ceramic heating flake) heating brass body, and the PTC element directly is connected on the power electrode, and circuit does not need protection.And the volume-diminished of brass calandria is 1/4 of former calandria, because the calandria volume is little, so thermal inertia is little.And temperature control do not have return difference, the temperature control error can reach ± and 1 ℃.The mould mounting hole site is in the brass calandria, and the brass calandria is outward the PTC element, and the PTC element connects two power electrodes.

The utility model is described in further detail below in conjunction with drawings and Examples:

Heating head circuit diagram in Fig. 1, the prior art;

Calandria structure chart in Fig. 2, the prior art;

The circuit diagram of Fig. 3, the utility model heater;

Fig. 4, the utility model calandria structure chart.

Among the figure: 1, regulate temperature screw(s); 2, bimetal leaf; 3, electrode; 4, fire tube; 5, brass calandria; 6, mould installing hole; 7, PTC element; 8, power electrode; 9, thermal-insulation coat.

Replacing fire tube in the former calandria with two PTC elements, as the thermal source of brass calandria, is 1/4 of former calandria thereby make the volume of brass calandria.The internal resistance of PTC element (positive temperature coefficient element) raises along with temperature and increases; so the PTC element itself has the constant temperature function; can not produce overheated, overcurrent; can directly be connected on the mains supply; do not need temperature control and various holding circuit, because the calandria volume is little, so thermal inertia is little; and temperature control do not have return difference, the temperature control error can reach ± and 1 ℃.

Claims

A kind of hot-press arrangement is made up of two power electrodes, PTC element, thermal-insulation coat, calandria and mould installing hole, it is characterized in that: the mould mounting hole site is in the brass calandria, and the brass calandria is outward the PTC element, and the PTC element connects two power electrodes.