Automatic temperature control coating machine

Abstract

The coating machine provided by the utility model comprises a drying oven, the upper end of the drying oven is communicated with a heating mechanism, a temperature sensor is arranged in the drying oven, the temperature sensor is electrically connected with a booster pump so as to control the flow speed of hot oil in the heating mechanism, and the coating machine further comprises a second temperature control assembly which is arranged in the drying oven and comprises a temperature-sensitive deformation piece, one end of the temperature-sensitive deformation part is provided with a first contact and a second contact which are distributed up and down, so that the temperature-sensitive deformation part drives the two contacts to move along with the temperature change, an elastic part is connected between the temperature-sensitive deformation part and the second contact, and a first contact switch and a second contact switch which correspond to the moving path of the contacts are arranged on the moving path of the contacts. According to the automatic temperature control coating machine, the second temperature control assembly and the temperature sensor are arranged to monitor the temperature in the drying oven together, and the problem that the temperature control of the coating machine is abnormal due to the fact that the error of the electrically-controlled temperature sensor is gradually increased or even breaks down in the long-term use process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating machines, in particular to an automatic temperature-control coating machine. Background Art

[0002] At present, the coating machines on the market usually input the heated hot oil into the hot oil pipeline, and the hot air delivered by the heating fan through the hot oil pipeline is used to dry the film in the coating machine. However, in the actual production process, due to the large temperature difference in different seasons, the temperature loss rate is different, and the oil temperature input into the hot oil pipeline and the speed of hot oil circulation are constant, which will result in partial waste of heating power in summer, which is not in line with the environmental protection concept of energy conservation and emission reduction. In winter, the oil temperature loses faster and the oil temperature circulation speed is not enough, resulting in the problem that the temperature of the hot air heated by the oil temperature does not meet the standard. The inventor's prior application with application number CN202123193242.1 discloses a coating machine, which controls the oil pump circulation speed through a temperature sensor, so as to achieve temperature control adaptation to different seasons. However, the error of the sensor will gradually increase during long-term use, and even failures or malfunctions may occur, resulting in the coating machine being unable to control the temperature normally, resulting in defective and inferior products. Therefore, a coating machine with automatic temperature control is proposed to solve the above problems. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a coating machine with automatic temperature control, which has the advantage of stable temperature control.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coating machine with automatic temperature control, comprising an oven, wherein the upper end of the oven is connected to a heating mechanism, in which a temperature sensor is arranged, and the temperature sensor is electrically connected to a booster pump to control the flow rate of hot oil in the heating mechanism. It also includes a second temperature control component placed in the oven, which includes a temperature-sensitive deformation member, and one end of the temperature-sensitive deformation member is provided with a first contact and a second contact distributed up and down, so that the temperature-sensitive deformation member drives the two contacts to move with temperature changes, an elastic member is connected between the temperature-sensitive deformation member and the second contact, and a first contact switch and a second contact switch corresponding to the contact are arranged on the moving path of the contact, and within a preset working temperature range, the second contact switch is connected by abutment with the second contact, and the first contact switch is disconnected from the first contact, and the two contact switches are electrically connected to the booster pump respectively.

[0005] Furthermore, a connecting rod is provided at the upper end of the temperature-sensitive deformation member, and the elastic member is connected between the connecting rod and the second contact.

[0006] Furthermore, the elastic member is a spring, a telescopic rod is connected between the connecting rod and the second contact, and the spring is sleeved on the outer periphery of the telescopic rod.

[0007] Furthermore, the temperature-sensitive deformation member is a thermal spring.

[0008] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0009] The automatic temperature-controlled coating machine monitors the temperature in the oven together with the temperature sensor by setting a second temperature-control component based on physical properties rather than sensing, thereby preventing the temperature control of the coating machine from being abnormal due to the gradual increase in error or even failure of the electronically controlled temperature sensor during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the appearance diagram of the utility model;

[0011] Figure 2 This is a reference diagram for two temperature control components in the oven;

[0012] Figure 3 This is a structural reference diagram of the second temperature control component.

[0013] In the figure: 1. oven; 2. fan; 3. oil heat exchanger; 31. hot oil inlet and outlet; 32. air supply pipe; 4. temperature sensor; 5. second temperature control component; 51. temperature-sensitive deformation member; 52. first contact; 53. first contact switch; 54. connecting rod; 55. telescopic rod; 56. spring; 57. second contact; 58. second contact switch. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0015] See also Figure 1 The present invention relates to an automatic temperature-controlled coating machine, comprising an oven 1, the upper end of which is connected to a heating mechanism, in which a temperature sensor 4 is arranged, and the temperature sensor 4 is electrically connected to a booster pump (not shown in the figure) to control the circulation speed of hot oil in the heating mechanism, see Figure 2-3 , also includes a second temperature control component 5 placed in the oven 1, which includes a temperature-sensitive deformation member 51, and one end of the temperature-sensitive deformation member 51 is provided with a first contact 52 and a second contact 57 distributed up and down, so that the temperature-sensitive deformation member 51 drives the two contacts to move with the temperature change, an elastic member is connected between the temperature-sensitive deformation member 51 and the second contact 57, and a first contact switch 53 and a second contact switch 58 corresponding to the contact are provided on the moving path of the contact, and within the preset working temperature range, the second contact switch 58 is connected with the second contact 57 by abutment, and the first contact switch 53 is disconnected from the first contact 52, and the two contact switches are electrically connected to the booster pump respectively.

[0016] The device controls the temperature of the heating mechanism by setting a temperature sensor 4 and a second temperature control component 5 to control the temperature of the oven 1 within a normal operating temperature range. The heating mechanism can be a variety of embodiments. In the prior art, the oven 1 is usually heated by an oil heat exchanger 3. The oil heat exchanger 3 includes a hot oil inlet and outlet 31, and the speed of hot oil circulation is controlled by a booster pump. The temperature of the oil heat exchanger 3 is blown out by a fan 2, and the heat is continuously sent into the oven 1 through an air supply pipe 32. The temperature of the hot oil is constant. Due to the loss of temperature, the slower the pumping speed of the oil, the lower the heat delivery. The faster the pumping speed of the oil, the closer the heat delivered by the air supply pipe 32 is to the original temperature of the hot oil. In order to maintain the normal temperature in the oven 1 and ensure that the oil heat loss is in an ideal state, the temperature in the oven 1 is monitored in real time by setting a temperature sensor 4. If the temperature is too high or too low, the pumping speed of the oil by the booster pump is changed.

[0017] In order to prevent the temperature sensor 4 from malfunctioning or having increasing errors during long-term use, the present application provides a temperature-sensitive deformation member 51 so that it can be extended or shortened following temperature changes, and a second contact 57 that is normally connected to the second contact switch 58 and a first contact 52 that is normally disconnected from the first contact switch 53 are provided on the temperature-sensitive deformation member 51. The first contact switch 53 and the second contact switch 58 are both electrically connected to the PLC controller in the machine, and the priority of the electrical signals of the two contact switches is higher than that of the temperature sensor 4. When the temperature in the oven 1 is lower than the operating temperature range, the temperature-sensitive deformation member 51 will contract and drive the second contact 57 and the second contact switch 58 to be electrically connected. 8 is disconnected, at this time the first contact switch 53 and the second contact switch 58 are both disconnected, at this time an electrical signal is sent to the PLC controller and the booster pump is controlled by the PLC controller to increase the pump speed. If the temperature in the oven 1 is higher than the operating temperature range, the temperature-sensitive deformation member 51 will extend, driving the first contact 52 to connect with the first contact switch 53. At this time, the first contact switch 53 and the second contact switch 58 are both connected, and an electrical signal is sent to the PLC controller to control the booster pump to reduce the pump speed. The above two situations can be prompted to the user by setting an alarm mechanism. The alarm mechanism can be a buzzer or a warning light to prompt the user that the temperature sensor 4 has failed.

[0018] Furthermore, a connecting rod 54 is provided at the upper end of the temperature-sensitive deformation member 51 , and the elastic member is connected between the connecting rod 54 and the second contact 57 .

[0019] The device arranges the connecting rod 54 so that the two contact switches are distributed up and down, so that the two contacts can be placed in different contact switches at the same time.

[0020] Furthermore, the elastic member is a spring 56 , and a telescopic rod 55 is connected between the connecting rod 54 and the second contact 57 , and the spring 56 is sleeved onto the outer periphery of the telescopic rod 55 .

[0021] Since the second contact switch 58 is normally connected within the normal temperature range and the first contact switch 53 is normally disconnected, the spring 56 is provided so that when the device is overheated and the deformable member is in an extended state, the spring 56 is compressed to ensure that the second contact 57 and the second contact switch 58 will not interfere with each other, thereby protecting the second contact switch 58. Since the spring 56 is connected to the second contact 57, in order to prevent the spring 56 from being bent due to the gravity of the second contact 57 and making it impossible for the spring 56 to be normally extended and retracted, the telescopic rod 55 is provided to prevent the spring 56 from being bent, thereby increasing the service life of the spring 56.

[0022] The temperature-sensitive deformation member 51 in the device can adopt a variety of embodiments that can expand and contract with heat, for example, utilizing the thermal expansion and contraction characteristics of gas and using an airbag as the temperature-sensitive deformation member 51. In the preferred embodiment of the present application, the temperature-sensitive deformation member 51 is a thermal spring 56.

[0023] The length of the thermistor spring 56 increases as the temperature rises. The device is provided with the thermistor spring 56 so that when the actual temperature exceeds the normal working temperature, the thermistor spring 56 drives the first contact 52 and the second contact 57 to be connected at the same time. When the temperature is lower than the normal working temperature range, the thermistor spring 56 drives the second contact 57 and the first contact 52 to be disconnected at the same time.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic temperature-controlled coating machine, comprising an oven (1), wherein the upper end of the oven (1) is connected to a heating mechanism, wherein a temperature sensor (4) is arranged inside the oven, and wherein the temperature sensor (4) is electrically connected to a booster pump to control the flow rate of hot oil in the heating mechanism, wherein: The invention also comprises a second temperature control component (5) placed in the oven (1), comprising a temperature-sensitive deformation member (51), one end of which is provided with a first contact (52) and a second contact (57) distributed up and down, so that the temperature-sensitive deformation member (51) drives the two contacts to move as the temperature changes, an elastic member is connected between the temperature-sensitive deformation member (51) and the second contact (57), and a first contact switch (53) and a second contact switch (58) corresponding to the contacts are provided on the moving path of the contacts, and within a preset working temperature range, the second contact switch (58) is connected to the second contact (57) by abutment, and the first contact switch (53) is disconnected from the first contact (52), and the two contact switches are respectively electrically connected to the booster pump.

2. The automatic temperature control coating machine according to claim 1, characterized in that: A connecting rod (54) is provided at the upper end of the temperature-sensitive deformation member (51), and the elastic member is connected between the connecting rod (54) and the second contact (57).

3. The automatic temperature control coating machine according to claim 2, characterized in that: The elastic member is a spring (56), a telescopic rod (55) is also connected between the connecting rod (54) and the second contact (57), and the spring (56) is sleeved onto the outer periphery of the telescopic rod (55).

4. An automatic temperature-controlled coating machine according to any one of claims 1 to 3, characterized in that: The temperature-sensitive deformation member (51) is a heat-sensitive spring (56).

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