High-precision online liquid temperature control heating mechanism

Abstract

The utility model discloses a kind of high-precision online liquid temperature control heating mechanism, including S back type heating pipeline, multiple heating pipes, outlet water temperature control probe and preheating temperature control probe;S back type heating pipeline is alternatively connected by multiple horizontal main pipes and vertical guide pipes;Bottom horizontal main pipe connects inlet pipe, top horizontal main pipe connects outlet pipe;Heating pipe and horizontal main pipe are configured one-to-one, and one heating pipe is inserted in each horizontal main pipe;Except the heating pipe in the horizontal main pipe of bottom as preheating pipe;The heating pipe in the horizontal main pipe of bottom as supplementary heating pipe;Outlet water temperature control probe is inserted in outlet pipe;Preheating temperature control probe is inserted in any horizontal main pipe except bottom;Multiple heating pipes, outlet water temperature control probe and preheating temperature control probe are electrically connected with controller respectively.Classification temperature control design and multiple safety protection mechanism are used, and temperature control accurate technical effect is achieved.

Description

Technical Field

[0001] This utility model relates to a pipeline heating mechanism, and more particularly to a high-precision online liquid temperature control heating mechanism, belonging to the technical field of PCBA online cleaning machine. Background Technology

[0002] PCBA online cleaning machines are automated devices specifically designed to remove residual organic and inorganic contaminants such as rosin, water-soluble flux, and no-clean flux from PCBA circuit boards after soldering. Currently, most PCBA online cleaning machines use in-tank heating for their liquid heating mechanisms. This involves installing heating elements in a preheating tank to heat the liquid before adding it to the cleaning tank. However, this heating method suffers from slow heating speed, uneven heating, and significant temperature fluctuations. When cleaning high-precision, temperature-sensitive electronic components, large temperature fluctuations can lead to defective products.

[0003] Therefore, it is necessary to improve and optimize the existing heating mechanism to enhance heating efficiency and temperature stability, and meet the requirements of high-precision cleaning. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a high-precision online liquid temperature control heating mechanism, achieving the technical objectives of simple structure, small size, low cost, and precise temperature control.

[0005] To achieve the above technical objectives, this utility model provides a high-precision online liquid temperature control heating mechanism, including: an S-shaped heating pipe, multiple heating tubes, an outlet water temperature control probe, and a preheating temperature control probe; The S-shaped heating pipe is composed of multiple horizontal main pipes and vertical guide pipes connected alternately; wherein, the bottom horizontal main pipe is connected to the water inlet pipe and the top horizontal main pipe is connected to the water outlet pipe. The heating tubes and the horizontal main pipes are configured in a one-to-one correspondence, with one heating tube inserted in each horizontal main pipe; among them, the heating tubes in each horizontal main pipe except the bottom one are used as preheating tubes; the heating tube in the bottom horizontal main pipe is used as a supplementary heating tube. The outlet water temperature control probe is inserted into the outlet water pipe; the preheating temperature control probe is inserted into any horizontal main pipe except the bottom. Furthermore, the multiple heating tubes, the outlet water temperature control probe, and the preheating temperature control probe are each electrically connected to the controller.

[0006] In the above technical solution, the preheating tube is used to heat the liquid from the initial temperature to a temperature close to the preset temperature; the supplementary heating tube is used to accurately heat the liquid close to the preset temperature to the preset temperature; the outlet water temperature control probe is used to monitor the outlet water temperature; and the preheating temperature control probe is used to monitor the preheating temperature.

[0007] Furthermore, this utility model also includes a liquid level protection device; the liquid level protection device includes: a bypass pipe connected to the water outlet pipe, and a transparent liquid level pipe installed on the bypass pipe; a photoelectric liquid level sensor is installed on the transparent liquid level pipe. The photoelectric liquid level sensor is electrically connected to a controller.

[0008] In the above technical solution, the photoelectric liquid level sensor is used to monitor whether there is liquid inside the transparent liquid level tube. Only when the transparent liquid level tube detects liquid will the controller activate the preheating tube and supplement the power supply to the heating tube to prevent the risk of dry burning.

[0009] Furthermore, the present invention provides four heating tubes, namely a preheating tube one, a preheating tube two, a preheating tube three, and a supplementary heating tube; there are also four horizontal main pipes, which are arranged in sequence along the vertical direction, and the preheating tube one, the preheating tube two, the preheating tube three, and the supplementary heating tube are respectively installed from top to bottom.

[0010] Furthermore, in this invention, the preheating temperature control probe is installed at the right end of the second horizontal main pipe from top to bottom.

[0011] Furthermore, in this invention, the preheating temperature control probe and the outlet water temperature control probe are respectively fixed to the heating pipe via a threaded structure.

[0012] Furthermore, this utility model also includes two opposing fixing plates; the two sides of the heating pipe are respectively installed on the inner sides of the two fixing plates.

[0013] In summary, this utility model adopts a graded temperature control design and multiple safety protection mechanisms, achieving the technical effects of simple structure, small size, low cost, and precise temperature control.

[0014] Compared with the prior art, this utility model has the following technical advantages: (1) Staged precision heating system: The preheating tube is responsible for rapidly heating the liquid from the initial temperature to close to the set temperature; the supplementary heating tube performs final precise temperature adjustment on the preheated liquid to ensure that the outlet water temperature is stable at the set value. In addition, the two heating tubes work together to ensure both heating efficiency and precise temperature control.

[0015] (2) Dual temperature monitoring system: Preheating temperature probe: monitors the liquid temperature in real time during the preheating stage; outlet water temperature probe: strictly monitors the final outlet water temperature. In addition, the data from the two probes are linked, and the heating power is dynamically adjusted through a PID algorithm to ensure that the outlet water temperature of the heating mechanism is the set temperature.

[0016] (3) Intelligent anti-dry-burning protection device: The photoelectric liquid level sensor is installed at the transparent liquid level tube of the water outlet bypass pipe and uses the infrared photoelectric beam principle to detect the liquid level. In addition, the heating tube is only allowed to start when a liquid level signal is detected, and the power supply is automatically cut off in abnormal conditions to prevent the heating tube from dry-burning and causing safety accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the liquid flow direction during the operation of this utility model; In the diagram: 1. Preheating tube one, 2. Preheating tube two, 3. Preheating tube three, 4. Supplementary heating tube, 5. Outlet water temperature control probe, 6. Preheating temperature control probe, 7. Heating pipe, 71. Inlet water pipe, 72. Outlet water pipe, 73. Bypass pipe, 8. Transparent liquid level pipe, 9. Photoelectric liquid level sensor, 10. Fixture. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with embodiments thereof. In the description of this application, terms such as "connection" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figure 1 As shown in the figure, this embodiment provides a high-precision online liquid temperature control heating mechanism, including an S-shaped heating pipe 7, multiple heating tubes, an outlet water temperature control probe 5, and a preheating temperature control probe 6, which are described in detail below.

[0020] The S-shaped heating pipe 7 is composed of multiple horizontal main pipes and vertical guide pipes connected alternately. Adjacent horizontal main pipes are diverted by the vertical guide pipes to form a continuous S-shaped flow channel. The bottom horizontal main pipe is connected to the inlet pipe, and the top horizontal main pipe is connected to the outlet pipe 72, forming a complete circulation path.

[0021] The heating tubes are configured in a one-to-one correspondence with the horizontal main pipes, with one heating tube inserted into each horizontal main pipe. Specifically, the heating tubes in the horizontal main pipes (excluding the bottom one) serve as preheating tubes, used to heat the liquid from its initial temperature to near the preset temperature; the heating tube in the bottom horizontal main pipe serves as a supplementary heating tube, used to precisely heat the liquid from near the preset temperature to the preset temperature. Furthermore, each of the multiple heating tubes is electrically connected to a controller.

[0022] In specific implementation, the heating pipe 7 adopts an S-shaped structure design, including multiple horizontal main pipes and multiple vertical guide pipes. Adjacent horizontal main pipes are connected by vertical guide pipes, forming a serpentine layout through continuous bending, which can extend the fluid path to enhance heat exchange time and enhance the effect of uniform heating, making it suitable for scenarios that require precise temperature control.

[0023] Each of the horizontal main pipes, except for the bottom one, is equipped with a preheating tube, the number of which is one less than the total number of horizontal main pipes. These preheating tubes are responsible for heating the fluid from its initial temperature to near the set temperature (usually maintained in the range of 90-95% of the set temperature), preparing it for final precise temperature control.

[0024] The supplementary heating tube 4 is located inside the bottom horizontal main pipe and serves as a terminal temperature regulation unit. It is responsible for precisely heating the preheated fluid to the set temperature and can make fine adjustments to the fluid temperature within ±0.5℃. This staged heating mechanism combines the wide-range heating of the preheating tube with the fine adjustment of the supplementary heating tube, and with the turbulent mixing characteristics of the S-shaped flow channel, to achieve efficient and precise liquid temperature control.

[0025] In other embodiments, such as Figure 1 As shown, there are four heating tubes: a preheating tube 1, a preheating tube 2, a preheating tube 3, and a supplementary heating tube 4. There are also four horizontal main pipes; these are arranged vertically in sequence. Furthermore, each of the four heating tubes is installed in a one-to-one correspondence with a horizontal main pipe, from top to bottom: preheating tube 1 is installed in the first horizontal main pipe; preheating tube 2 is installed in the second horizontal main pipe; preheating tube 3 is installed in the third horizontal main pipe; and supplementary heating tube 4 is installed in the fourth horizontal main pipe (bottom).

[0026] In practice, preheating tube 1, preheating tube 2, preheating tube 3, and supplementary heating tube 4 are fixed to the left end of the corresponding horizontal main pipe via flanges. Preheating tubes 1, 2, and 3 are used to heat the liquid from its initial temperature to near the preset temperature in stages; supplementary heating tube 4 is used to precisely heat the preheated liquid to the preset temperature. This staged heating design, through temperature gradient control, ensures heating efficiency while achieving high-precision temperature control of ±0.5℃.

[0027] like Figure 1 As shown, the outlet water temperature control probe 5 is inserted into the outlet pipe 72; the preheating temperature control probe 6 is inserted into any of the horizontal main pipes except the bottom one. Furthermore, the outlet water temperature control probe 5 and the preheating temperature control probe 6 are electrically connected to the controller. In a specific implementation, the preheating temperature control probe 6 is inserted at the right end of the second horizontal main pipe from the top, for real-time monitoring of the preheating temperature. The outlet water temperature control probe 5 is inserted at the top of the outlet pipe 72, for real-time monitoring of the outlet water temperature of the heating mechanism.

[0028] In other embodiments, the outlet water temperature control probe 5 and the preheating temperature control probe 6 are fixed to the heating pipe 7 by a threaded structure, which facilitates installation and maintenance.

[0029] In other embodiments, such as Figure 1 As shown, this utility model also includes a liquid level protection device; the liquid level protection device includes a bypass pipe 73 connected to the water outlet pipe 72, a transparent liquid level pipe 8 installed on the bypass pipe 73; and a photoelectric liquid level sensor 9 installed on the transparent liquid level pipe 8. Furthermore, the photoelectric liquid level sensor 9 is electrically connected to the controller. In specific implementation, the photoelectric liquid level sensor 9 is fixed on the transparent liquid level pipe 8 to monitor in real time whether there is liquid inside the transparent liquid level pipe 8 and feeds back to the controller as a switching signal for the heating element.

[0030] In addition, to achieve the above effects, in terms of circuit design: the preheating tube and the supplementary heating tube 4 are connected to the power output terminal of the PLC controller (or temperature controller) and the heating power is adjusted by the PID algorithm; the outlet water temperature control probe 5 and the preheating temperature control probe 6 are connected to the temperature signal input port of the controller to form a closed-loop feedback system; the photoelectric liquid level sensor 9 is connected to the digital input (DI) port of the controller to monitor the liquid level of the bypass tube 73 in real time.

[0031] In practice, the controller only activates the preheating tube and supplies power to the supplementary heating tube 4 when liquid is detected by the transparent liquid level tube 8, preventing the risk of dry burning and avoiding safety hazards. The preheating temperature control probe 6 monitors the intermediate temperature, and the outlet water temperature control probe 5 monitors the final temperature. The data from both participate in PID calculations to dynamically adjust the power of each heating tube. Furthermore, the supplementary heating tube 4 uses PWM pulse control to achieve an accuracy adjustment of ±0.1℃. When the liquid level is abnormal or the temperature control probe fails, the controller immediately cuts off the power to the heating tube, triggers an audible and visual alarm, and records the fault code. It should be noted that the PID calculations and PWM pulse control of the temperature controller or PLC controller are existing technologies, and their specific implementation methods will not be elaborated further.

[0032] In other embodiments, such as Figure 1As shown, this utility model also includes two opposing fixing plates 10; the heating pipe 7 is installed on the inner sides of the two fixing plates 10 on both sides respectively. In specific implementation, the preheating pipe and the supplementary heating pipe 4 are respectively inserted into the heating pipe 7 from left to right from the left fixing plate 10. The preheating temperature control probe 6 is inserted into the right end of the second transverse main pipe from right to left from the right fixing plate 10.

[0033] like Figure 2 As shown, the working process of this utility model is as follows: Liquid is injected into the S-shaped heating pipe 7 through the inlet pipe 71. The photoelectric liquid level sensor 9 monitors the liquid state in the transparent liquid level tube 8 in real time. The controller only allows the heating tube to start working when a valid liquid level is detected. When there is liquid in the transparent liquid level tube 8, the heating tube starts working: preheating tube 1, preheating tube 2, and preheating tube 3 heat the liquid from the initial temperature to near the preset temperature in stages; supplementary heating tube 4 precisely heats the preheated liquid to the preset temperature; at the same time, the preheating temperature control probe 6 monitors the preheating temperature in real time, and the outlet water temperature control probe 5 monitors the outlet water temperature in real time. The controller dynamically adjusts the power output of preheating tube 1, preheating tube 2, preheating tube 3, and supplementary heating tube 4 to ensure that the outlet water temperature is stable at the set value. In this way, the liquid flows in the S-shaped heating pipe 7, ensuring that all liquid can contact the heating components and be precisely heated to the preset temperature.

[0034] In summary, the heating mechanism provided by this utility model can heat liquids online with high precision, and has the technical advantages of simple structure, small size, low cost, safety, and high temperature control accuracy.

[0035] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, based on the ideas of this utility model, modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the ideas and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-precision online liquid temperature control heating mechanism, characterized in that, include: S-shaped heating pipe, multiple heating tubes, outlet water temperature control probe, and preheating temperature control probe; The S-shaped heating pipe is composed of multiple horizontal main pipes and vertical guide pipes connected alternately; wherein, the bottom horizontal main pipe is connected to the water inlet pipe and the top horizontal main pipe is connected to the water outlet pipe. The heating tubes and the horizontal main pipes are configured in a one-to-one correspondence, with one heating tube inserted in each horizontal main pipe; among them, the heating tubes in each horizontal main pipe except the bottom one are used as preheating tubes; the heating tube in the bottom horizontal main pipe is used as a supplementary heating tube. The outlet water temperature control probe is inserted into the outlet water pipe; the preheating temperature control probe is inserted into any horizontal main pipe except the bottom. Furthermore, the multiple heating tubes, the outlet water temperature control probe, and the preheating temperature control probe are each electrically connected to the controller.

2. The high-precision online liquid temperature control heating mechanism according to claim 1, characterized in that, It also includes a liquid level protection device; the liquid level protection device includes: a bypass pipe connected to the water outlet pipe, and a transparent liquid level pipe installed on the bypass pipe; a photoelectric liquid level sensor is installed on the transparent liquid level pipe; and the photoelectric liquid level sensor is electrically connected to a controller.

3. A high-precision online liquid temperature control heating mechanism according to claim 1 or 2, characterized in that, The heating tubes are provided in four parts, namely, preheating tube one, preheating tube two, preheating tube three, and supplementary heating tube; there are also four horizontal main pipes, which are arranged in sequence along the vertical direction, and preheating tube one, preheating tube two, preheating tube three and supplementary heating tube are installed from top to bottom respectively.

4. The high-precision online liquid temperature control heating mechanism according to claim 3, characterized in that, The preheating temperature control probe is installed at the right end of the second horizontal main pipe from top to bottom.

5. A high-precision online liquid temperature control heating mechanism according to claim 1 or 2, characterized in that, The preheating temperature control probe and the outlet water temperature control probe are respectively fixed to the heating pipe by a threaded structure.

6. A high-precision online liquid temperature control heating mechanism according to claim 1 or 2, characterized in that, It also includes two opposing fixing plates; the heating pipe is installed on the inner side of the two fixing plates on both sides respectively.

Images