CN113720875A - Control system of heat transfer effect testing device and use method - Google Patents
Control system of heat transfer effect testing device and use method Download PDFInfo
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- CN113720875A CN113720875A CN202111291849.5A CN202111291849A CN113720875A CN 113720875 A CN113720875 A CN 113720875A CN 202111291849 A CN202111291849 A CN 202111291849A CN 113720875 A CN113720875 A CN 113720875A
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention relates to a control system of a heat transfer effect testing device and a use method thereof.A lower chamber is arranged on a chassis, a heating element, a cold source radiator and a fan are arranged in the lower chamber, a heat channel is arranged in the center of a middle heat insulation layer, a sample corner part and a straight section positioning plate are arranged on the middle heat insulation layer, two sensors on the sample are arranged at the lower end of an inverted U-shaped frame, the middle part of a swinging rod is connected with a tension spring and an electric cylinder B, a movable plate is arranged at the top outside the upper chamber, vertical sliding sleeves are welded at four corners of the movable plate, sliding rods penetrate through the sliding sleeves, the lower ends of the sliding rods are fixed on the chassis, the upper ends of the sliding rods are fixed on a horizontal plate through nuts, the center of the horizontal plate is provided with a hole, and a telescopic cylinder A is inserted in the hole, and the lower end of the telescopic cylinder A is connected with the movable plate. The scheme of the invention realizes the automation of the detection process and can improve the detection quality and efficiency.
Description
Technical Field
The invention relates to the technical field of control systems of heat transfer testing devices, in particular to a control system of a heat transfer effect testing device and a using method thereof.
Background
In order to meet the high requirements of consumers and improve the performance of products, the heat transfer effect of various materials needs to be tested, the principle of detecting the heat transfer performance of the materials at present is to transfer constant heat energy from the lower surface to the upper surface of a material test piece, and the ratio of the temperature value when the temperature of the upper surface reaches stability to the used time is tested.
However, most of the existing detection on the heat transfer effect of the material is manual operation, calculation and judgment, and the problems of multiple human interference factors, high detection quality and low efficiency exist. Moreover, some testing devices on the market have the defect of low detection quality due to low control precision of various parts of equipment.
Therefore, the application designs a control system and a using method of the heat transfer effect testing device to solve the problems.
Disclosure of Invention
In order to make up for the defects in the prior art, the invention provides the control system and the use method of the heat transfer effect testing device, which reduce the human interference factors to the maximum extent, realize the automation of the detection process and improve the detection quality and efficiency.
The invention is realized by the following technical scheme:
a control system of a heat transfer effect testing device mainly comprises: the device comprises an upper chamber, a middle heat insulation layer, a lower chamber, an upper chamber lifting device, a heating and refrigerating device, a sample and sensor fixing device, a display PLC controller and the like.
The upper chamber and the lower chamber are hermetically isolated by a middle heat insulation layer and are made of heat insulation materials, and the internal size and contact matching of the upper chamber and the lower chamber meet related requirements. The base plate is placed on the workbench, a groove is formed in the base plate, a lower chamber is placed in the groove, and the lower chamber is of a rectangular structure with an opening at the top, the bottom and the walls on the periphery of the rectangular structure. The left side of the bottom in the length direction of the lower chamber is provided with an electric heating part, and the right side of the bottom in the length direction of the lower chamber is provided with a cold source distributor, and a pipeline of the cold source distributor penetrates through the wall on the right side of the lower chamber and is connected with the refrigerator through a pipe connector. The speed-regulating fan is fixed on the upper part of the cold source radiator, namely the wall on the right side of the lower chamber through bolts. The sealing ring is arranged around the top of the lower chamber, the middle heat-insulating layer is pressed above the sealing ring, and the contact inclined planes with the same angle are arranged at the parts of the middle heat-insulating layer and the periphery of the top of the lower chamber, which are connected, so that the sealing and the structural stability are facilitated.
A rectangular hole heat channel with a specified size is formed in the center of the middle heat insulation layer, and PT100 temperature sensors for the lower chamber are arranged on the periphery below the rectangular hole heat channel. Place the rectangular material sample that covers rectangular hole heat channel regulation size in rectangular hole heat channel's top, place left PT100 temperature sensor on the sample top length direction the left side, place right PT100 temperature sensor on the right, left side temperature sensor and right temperature sensor fix respectively in the both ends below of the frame of falling the U-shaped, the frame of falling the U-shaped is made for insulating and heat insulating material, two parallel connection boards are fixed to the middle part top of the frame of falling the U-shaped, two connection board middle parts are equipped with the hole, horizontal minor axis A has worn in the hole, respectively be equipped with axle circlip at minor axis A's both ends, axle circlip fixes minor axis A on the hole at two connection board middle parts, be equipped with the swinging arms between two connection boards at minor axis A's middle part promptly. The other end of the swinging rod is provided with a horizontal short shaft B, two ends of the short shaft B are arranged in holes at the upper parts of the two parallel fixing plates through elastic check rings for shafts, and the lower ends of the fixing plates are fixed on the upper surface of the middle heat insulation layer through bolts.
The upper surface of the middle heat insulation layer is provided with an electric cylinder B through a bolt, the top of the telescopic cylinder B is provided with a horizontal support shaft, the shaft center line of the horizontal support shaft is vertical to the length direction of the oscillating rod, and the horizontal support shaft is positioned below the oscillating rod. A spring hook hanging plate is welded below the middle part of the oscillating rod, an extension spring is hung on the spring hook hanging plate, the other end, namely the lower end, of the extension spring is hung on the other spring hook hanging plate, the spring hook hanging plate is fixed on the upper surface of a middle heat insulation layer through a bolt, when a servo motor B works, a telescopic cylinder B rises a horizontal supporting shaft to support the front edge of the oscillating rod, namely a left PT100 temperature sensor and a right PT100 temperature sensor do not press and hold a material sample any more, and the sample can be taken away at the moment. When a sample is placed, the servo motor B works, the telescopic cylinder B descends, meanwhile, the front edge of the swing rod also descends, the left PT100 temperature sensor and the right PT100 temperature sensor are pressed on the sample, and the tension spring 35 can ensure that the left PT100 temperature sensor and the right PT100 temperature sensor are in close contact with the upper surface of the sample.
The upper surface at middle part insulating layer still is equipped with sample bight locating plate and the straight section locating plate of sample, and material sample can conveniently accurately be placed to sample bight locating plate and the straight section locating plate of sample, makes the central point that rectangular hole heat channel is located the material sample below put, has also guaranteed that left PT100 temperature sensor and right PT100 temperature sensor are accurate to be pressed and are put at material sample upper surface regulation symmetric position. The lower part of the upper chamber is provided with an opening, the height of the lower chamber is much lower than that of the upper chamber, the rest sizes and structures are the same, the lower ends of the periphery of the upper chamber are in contact fit with the upper end of the periphery of the middle heat-insulating layer, the contact fit form is the same as that of the lower chamber, and the middle heat-insulating layer is used for hermetically isolating the upper chamber from the lower chamber. The top of the upper chamber is fixed with a rectangular movable plate through bolts, the rectangular movable plate is horizontally arranged, vertical sliding sleeves are welded at four corners of the rectangular movable plate respectively, vertical sliding rods penetrate through the vertical sliding sleeves, the lower ends of the vertical sliding rods are fixed on a chassis through bolts, a horizontal plate is fixed at the upper ends of the vertical sliding rods through nuts, a hole is formed in the center of the horizontal plate, a telescopic cylinder A is inserted into the hole, a flange plate is arranged at the lower end of the telescopic cylinder A and fixed at the center of the rectangular movable plate through bolts, an electric cylinder A is fixed on the upper surface of the horizontal plate through bolts, and when a servo motor A works, the telescopic cylinder A drives the rectangular movable plate, an upper chamber and the vertical sliding sleeves, which are connected to the rectangular movable plate, to move upwards or downwards along the four vertical sliding rods.
The system comprises a servo motor A, a servo motor B, an electric heating element, a refrigerator, a speed regulation fan, a PLC controller for displaying wired or wireless connection of electric controls such as each PT100 temperature sensor, a left PT100 temperature sensor and a right PT100 temperature sensor for a lower chamber, and a detection control program is input into the PLC controller.
Based on the test device, the use method comprises the following steps:
before detection, the decorative surface of a material sample with a specified size is placed on the middle heat-insulating layer in an upward mode, one corner of the sample is made to abut against the sample corner positioning plate, and meanwhile, one long right-angle edge of the sample is made to abut against the sample straight section positioning plate. According to the test starting button in the PLC controller, each electric control component enters a working state, the PLC controller controls the servo motor B to work, the telescopic cylinder B slowly descends, the left PT100 temperature sensor and the right PT100 temperature sensor are pressed on a sample, and the tension spring can ensure that the left PT100 temperature sensor and the right PT100 temperature sensor are in good contact with the upper surface of the sample and ensure that the lower surface of the sample is in good and compact contact with the upper surface of the middle heat insulation layer.
The PLC controller controls the servo motor A to work, and the telescopic cylinder A17 extends to enable the lower end of the periphery of the upper chamber to be in contact with the upper end of the periphery of the middle heat insulation layer and to be sealed. The PLC controls the electric heating element, the refrigerating machine and the speed regulating fan to work according to the programming, and the speed regulating fan only plays a role in internal air circulation of the lower chamber space part because no external air enters the lower chamber space part. When the temperature values transmitted to the PLC by the left PT100 temperature sensor and the right PT100 temperature sensor on the upper surface of the sample in the upper chamber space part reach the reference temperature of 20 ℃ which is set by programming, the PLC starts to record the testing time and controls the electric heating element, the refrigerating machine and the speed regulating fan to work, so that the temperature of the PT100 temperature sensor for the lower chamber in the lower chamber space part is raised to 70 ℃ and kept constant.
And the PLC records the average temperature and time of the left PT100 temperature sensor and the right PT100 temperature sensor on the upper surface of the sample at intervals of 15min until the temperature of the upper surface of the sample is stable. The PLC controller obtains the heat conduction efficiency (DEG C/T) of the sample according to the temperature of the upper surface of the sample when the sample is stable and the time T used by the sample. After the detection is finished, the PLC sends out an audio-visual prompt and controls the servo motor A to work, the telescopic cylinder A is shortened, the working upper chamber is lifted, the PLC also controls the servo motor B to work at the same time, the telescopic cylinder B is extended to work, the support shaft at the top of the telescopic cylinder B supports the front edge of the oscillating rod, so that the left PT100 temperature sensor and the right PT100 temperature sensor do not press and hold a sample any more, the PLC sends out an audio-visual prompt of 'please take the sample out', then the relevant electric control is closed, and the PLC waits for another sample to be put in again.
The invention has the beneficial effects that:
the test device provided by the invention has the advantages that the test quality and efficiency are ensured by the sample positioning, the sensor pressing, the opening and closing of the upper chamber and the control system of each electric control part, the artificial interference factors are reduced to the maximum extent, the automation of the detection process is realized, and the detection quality and efficiency are improved.
Drawings
FIG. 1 is a front sectional view of a control system of the heat transfer effect testing apparatus of the present invention;
FIG. 2 is a top view of the control system of the heat transfer effect testing apparatus of the present invention;
FIG. 3 is a side view of a control system of the heat transfer effectiveness testing apparatus of the present invention;
FIG. 4 is an enlarged view of section I of FIG. 1 of the present invention;
FIG. 5 is a view of the invention from the direction A of FIG. 1;
FIG. 6 is an enlarged view taken from the direction B of FIG. 1 in accordance with the present invention;
FIG. 7 is a view of the upper chamber of the present invention in a raised standby mode.
In the figure, the position of the upper end of the main shaft,
1. a workbench, 2, a chassis, 3, a lower chamber, 4, an electric heating element, 5, a cold source radiator, 6, a speed-regulating fan, 7, a PT100 temperature sensor for the lower chamber, 8, a rectangular hole heat channel, 9, a sealing ring, 10, a middle heat insulation layer, 11, a vertical sliding sleeve, 12, a rectangular moving plate, 13, a vertical sliding rod, 14, a nut, 15, a horizontal plate, 16, a flange plate, 17, a telescopic cylinder A,18, an electric cylinder A,19, a servo motor A, 20, an upper chamber space part, 21, a material sample, 22, an upper chamber, 23, a lower chamber space part, 24, a pipe joint, 25, a refrigerator, 26, a display PLC controller, 27, a swing rod, 28, a connecting plate, 29, an elastic collar for a shaft, 30, a short shaft A,31, a spring hook hanging plate, 32, a support shaft, 33, an inverted U-shaped frame, 34, a telescopic cylinder B,35, a stretching spring, 36, an electric cylinder B,37 and a PT100 temperature sensor, 38. right PT100 temperature sensor, 39, sample straight section positioning plate, 40, fixing plate, 41, short shaft B, 42, servo motor B, 43, sample corner positioning plate, 44, contact inclined plane, 45 holes.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be noted that the terms "disposed," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Fig. 1-7 show a specific embodiment of the present invention, a chassis 2 is placed on a workbench 1, a groove is provided on the chassis 2, a lower chamber 3 is placed in the groove, and a rectangular structure with an opening at the top, a bottom and surrounding walls integrated is provided in the lower chamber 3. The left side of the bottom in the length direction of the lower chamber 3 is provided with an electric heating element 4, the right side is provided with a cold source distributor 5, and a pipeline of the cold source distributor 5 penetrates through the wall on the right side of the lower chamber 3 and is connected with a refrigerator 25 through a pipe connector 24. A speed-adjusting fan 6 is fixed on the upper part of the cold source radiator 5, namely the wall on the right side of the lower chamber 3 through bolts. The sealing ring 9 is arranged around the top of the lower chamber 3, the middle heat-insulating layer 10 is pressed above the sealing ring 9, and the contact inclined planes 44 with the same angle are arranged at the joint part of the middle heat-insulating layer 10 and the periphery of the top of the lower chamber 3, which is beneficial to sealing and structural stability.
A rectangular hole heat channel 8 with a specified size is arranged in the center of the middle heat insulation layer 10, and a PT100 temperature sensor 7 for a lower chamber is arranged on the periphery below the rectangular hole heat channel 8, as shown in figure 1. A rectangular material sample 21 with a specified size covering the rectangular hole heat channel 8 is placed above the rectangular hole heat channel 8, a left PT100 temperature sensor 37 is placed on the left side of the top of the sample 21 in the length direction, a right PT100 temperature sensor 38 is placed on the right side of the top of the sample 21, the left temperature sensor 37 and the right temperature sensor 38 are respectively fixed below two ends of an inverted U-shaped frame 33, the inverted U-shaped frame 33 is made of insulating heat insulation materials, two parallel connecting plates 28 are fixed above the middle part of the inverted U-shaped frame 33, holes are formed in the middle parts of the two connecting plates 28, a horizontal short shaft A30 penetrates through the holes, shaft elastic check rings 29 are respectively arranged at two ends of the short shaft A30, the short shaft A30 is fixed on the holes in the middle parts of the two connecting plates 28 through the shaft elastic check rings 29, a swing rod 27 is arranged in the middle part of the short shaft A30, namely between the two connecting plates 28, and the attached drawings 1, 4 and 5 are shown in the drawings.
The other end of the swinging rod 27 is provided with a horizontal short shaft B41, the two ends of the short shaft B41 are arranged in holes at the upper parts of two parallel fixing plates 40 through elastic retaining rings for shafts, and the lower end of the fixing plate 40 is fixed on the upper surface of the middle heat-insulating layer 10 through bolts. The upper surface of the middle heat insulation layer 10 is provided with an electric cylinder B36 through a bolt, the top of the telescopic cylinder B34 is provided with a horizontal support shaft 32, the axial center line of the horizontal support shaft 32 is vertical to the length direction of the swing rod 27, and the horizontal support shaft 32 is positioned below the swing rod 27. A spring hooking plate 31 is welded on the lower middle part of the swinging rod 27, an extension spring 35 is hung on the spring hooking plate 31, the other end, namely the lower end, of the extension spring 35 is hung on the other spring hooking plate, the spring hooking plate is fixed on the upper surface of the middle heat insulation layer 10 through a bolt, when a servo motor B42 works, a telescopic cylinder B34 rises, a horizontal supporting shaft 32 supports the front edge of the swinging rod 27, namely the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 do not press and hold the material sample 21 any more, and the sample 21 can be taken away at the moment, see the attached figure 7.
When the test specimen 21 is placed, the servo motor B42 operates, the telescopic cylinder B34 descends and the front edge of the swing rod 27 also descends, so that the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 are pressed on the test specimen 21, and the tension spring 35 can ensure that the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 are kept in close contact with the upper surface of the test specimen 21.
The upper surface of the middle heat insulation layer 10 is also provided with a sample corner positioning plate 43 and a sample straight section positioning plate 39, the sample corner positioning plate 43 and the sample straight section positioning plate 39 can conveniently and accurately place the material sample 21, so that the rectangular hole heat channel 8 is positioned at the central position below the material sample 21, and the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 are also ensured to be accurately pressed on the specified symmetrical positions of the upper surface of the material sample 21, see the attached figures 5 and 6.
The lower part of the upper chamber 22 is an opening, the height of the inner part of the upper chamber is much higher than that of the lower chamber 3, the rest sizes and structures are the same, the lower ends of the periphery of the upper chamber 22 are in contact fit with the upper end of the periphery of the middle heat-insulating layer 10, the contact fit form is the same as that of the lower chamber 3, and the middle heat-insulating layer 10 seals and isolates the upper chamber 22 from the lower chamber 3. The top outside the upper chamber 22 fixes the rectangular moving plate 12 through bolts, the rectangular moving plate 12 is placed horizontally, the four corners of the rectangular moving plate 12 are respectively welded with a vertical sliding sleeve 11, a vertical sliding bar 13 penetrates through the vertical sliding sleeve 11, the lower end of the vertical sliding bar 13 is fixed on the chassis 2 through bolts, the upper end of the vertical sliding bar 13 is fixed with a horizontal plate 15 through a nut 14, the center of the horizontal plate 15 is provided with a hole 45, a telescopic cylinder A17 is inserted in the hole 45, the lower end of the telescopic cylinder A17 is provided with a flange 16, the flange 16 is fixed at the center of the rectangular moving plate 12 through bolts, an electric cylinder A18 is fixed on the upper surface of the horizontal plate 15 through bolts, when the servo motor A19 works, the telescopic cylinder A17 drives the rectangular moving plate 12, the upper chamber 22 connected on the rectangular moving plate 12 and the vertical sliding sleeve 11 to move upwards or downwards along the four vertical sliding bars 13, see FIGS. 1 and 7.
Wherein, the servo motor A19, the servo motor B42, the electric heating element 4, the refrigerator 25, the speed regulating fan 6, the electric controls such as each PT100 temperature sensor 7 for the lower chamber, the left PT100 temperature sensor 37, the right PT100 temperature sensor 38 and the like are connected with the PLC 26 in a wired or wireless way.
The specific application method of this example is as follows:
referring to fig. 7, the device state before detection is shown, wherein a decorative surface of a material sample 21 with a specified size is placed on the middle heat-insulating layer 10 in an upward direction, one corner of the sample 21 is abutted against the sample corner positioning plate 43, and a long right-angle side of the sample 21 is abutted against the sample straight positioning plate 39 as shown in fig. 5.
Pressing the test start button in the display PLC controller 26, each electric control component enters the working state, the PLC controller 26 controls the servo motor B42 to work, so that the telescopic cylinder B34 slowly descends, the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 are pressed on the sample 21, the tension spring 35 can ensure that the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 are in good surface contact with the sample 21, and simultaneously, the lower surface of the sample 21 is in good and compact surface contact with the upper surface of the middle heat insulation layer 10, see the attached figure 6.
The PLC controller 26 controls the servo motor A19 to work, the telescopic cylinder A17 extends, and the lower end of the periphery of the upper chamber 22 is in contact with and sealed with the upper end of the periphery of the middle heat insulation layer 10, as shown in the attached figures 7 and 1. The PLC controller 26 controls the electric heating element 4, the refrigerator 25 and the speed-regulating fan 6 to work according to the programming, and the work of the speed-regulating fan 6 only plays a role of internal air circulation of the lower chamber space part 23 because no external wind enters the lower chamber space part 23.
When the temperature values transmitted to the PLC controller 26 by the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 on the upper surface of the sample 21 in the upper chamber space part 20 reach the reference temperature of 20 ℃ which is set by programming, the PLC controller 26 starts recording the test time and controls the electric heating element 4, the refrigerator 25, and the speed-adjustable fan 6 to operate, so that the temperature of the PT100 temperature sensor 7 for the lower chamber in the lower chamber space part 23 is raised to 70 ℃ and kept constant. The PLC controller 26 records the average temperature and time of the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 on the upper surface of the sample 21 at intervals of 15min until the temperature of the upper surface of the sample 21 is stable. The PLC controller 26 derives the heat transfer efficiency (c/T) of the sample 21 from the upper surface temperature c and the time T taken for the sample 21 to stabilize.
After the detection is finished, the display PLC 26 sends out an audio-visual prompt and controls the servo motor A19 to work, so that the telescopic cylinder A17 shortens the working upper chamber 22 to lift up, the PLC 26 also controls the servo motor B42 to work at the same time, so that the telescopic cylinder B34 extends to work, the support shaft 32 at the top of the telescopic cylinder B34 supports the front side of the swing rod 27, so that the left PT100 temperature sensor 37 and the right PT100 temperature sensor 38 do not press the sample 21 any more, and the display PLC 26 sends out an audio-visual prompt of 'please take the sample' and then closes the relevant electric control to wait for another sample to be put in again, as shown in figure 7.
The device and the use method reduce the human interference factor to the maximum extent, realize the automation of the detection process and achieve the aims of improving the detection quality and efficiency.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides a control system of heat transfer effect testing arrangement, includes lower room (3), middle part insulating layer (10), upper chamber (22), upper chamber take off and land device, generate heat and refrigerating plant, sample and sensor fixing device, demonstration PLC controller (26), its characterized in that:
the lower chamber (3) is of a rectangular structure with an opening at the top, and the bottom and the peripheral walls are integrated, and the lower chamber (3) is placed above the workbench (1);
the middle heat insulation layer (10) is arranged above the lower chamber (3) and hermetically isolates the upper chamber (22) from the lower chamber (3);
the upper chamber (22) is buckled upside down above the middle heat insulation layer (10), an upper chamber lifting device is arranged at the upper part of the upper chamber (22), and a sample and a sensor fixing device are arranged below the inside of the upper chamber (22);
the heating and refrigerating device is arranged in the lower chamber (3) and on the side;
the display PLC controller (26) is arranged on the workbench (1), and the display PLC controller (26) is connected with all the electric elements in a control mode.
2. The control system of the heat transfer effect testing apparatus according to claim 1, characterized in that:
a chassis (2) is arranged on the workbench (1), a groove is formed in the chassis (2), and a lower chamber (3) is arranged in the groove;
the heating and refrigerating device comprises an electric heating element (4) arranged on the left side of the bottom in the lower chamber (3), a cold source distributor (5) is arranged on the right side in the lower chamber (3), a pipeline of the cold source distributor (5) penetrates through the wall on the right side of the lower chamber (3) and is connected with a refrigerator (25) through a pipe connector (24), and a speed-regulating fan (6) is fixed on the inner wall on the right side of the lower chamber (3) above the cold source distributor (5) through a bolt;
the top of the lower chamber (3) is provided with a sealing ring (9) all around, a middle heat-insulating layer (10) is pressed above the sealing ring (9), and the middle heat-insulating layer (10) and the part jointed with the top of the lower chamber (3) all around are provided with contact inclined planes (44) with the same angle.
3. The control system of the heat transfer effect testing apparatus according to claim 1, characterized in that:
the sample and sensor fixing device comprises a PT100 temperature sensor (7) for a lower chamber, the PT100 temperature sensor (7) for the lower chamber is arranged around the lower part of a rectangular hole heat channel (8), the rectangular hole heat channel (8) is arranged at the center of a middle heat insulation layer (10), a rectangular material sample (21) is covered above the rectangular hole heat channel (8), a left PT100 temperature sensor (37) is placed on the left side of the top of the sample, a right PT100 temperature sensor (38) is placed on the right side of the top of the sample, the left temperature sensor and the right temperature sensor are respectively fixed below two ends of an inverted U-shaped frame (33), two parallel connecting plates (28) are fixed above the middle part of the inverted U-shaped frame (33), holes are formed in the middle parts of the two connecting plates (28), a horizontal short shaft A (30) penetrates through the holes, shaft elastic check rings (29) are respectively arranged at two ends of the short shaft A (30), the short shaft elastic check rings (29) fix the short shaft A (30) on the holes in the middle parts of the two connecting plates (28), a swing rod (27) is arranged in the middle of a short shaft A (30), namely between two connecting plates (28), a horizontal short shaft B (41) is arranged at the other end of the swing rod (27), two ends of the short shaft B (41) are arranged in holes at the upper parts of two parallel fixing plates (40) through elastic retaining rings (29) for shafts, the lower ends of the fixing plates (40) are fixed on the upper surface of a middle heat-insulating layer (10) through bolts, an electric cylinder B (36) is arranged on the upper surface of the middle heat-insulating layer (10) through bolts, a horizontal support shaft (32) is arranged at the top of a telescopic cylinder B (34), the shaft center line of the horizontal support shaft (32) is vertical to the length direction of the swing rod (37), the horizontal support shaft (32) is positioned below the swing rod (37), a spring hook hanging plate (31) is welded below the middle part of the swing rod (37), a tension spring (35) is hung on the spring hook hanging plate (31), and the lower end of the tension spring (35) is hung on the other spring hook hanging plate, the spring hook hanging plate is fixed on the upper surface of the middle heat insulation layer (10) through bolts.
4. The control system of the heat transfer effect testing apparatus according to claim 3, characterized in that:
the upper surface of middle part insulating layer (10) is equipped with sample bight locating plate (43) and sample straight section locating plate (39), conveniently places material sample (21) accurately, makes rectangular hole heat channel (8) be located the central point of material sample (21) below.
5. The control system of the heat transfer effect testing apparatus according to claim 1, characterized in that:
the upper chamber lifting device comprises an upper chamber (22), a rectangular moving plate (12) fixed to the outer top of the upper chamber (22) through bolts, the rectangular moving plate (12) is placed horizontally, vertical sliding sleeves (11) are welded to four corners of the rectangular moving plate (12), vertical sliding rods (13) penetrate through the vertical sliding sleeves (11), the lower ends of the vertical sliding rods (13) are fixed to a chassis (2) through bolts, a horizontal plate (15) is fixed to the upper ends of the vertical sliding rods (13) through nuts, holes (45) are formed in the centers of the horizontal plates (15), telescopic cylinders A (17) are inserted into the holes (45), flange plates (16) are mounted at the lower ends of the telescopic cylinders A (17), the flange plates (16) are fixed to the center of the rectangular moving plate (12) through bolts, the electric cylinders A (18) are fixed to the upper surface of the horizontal plate (15) through bolts, when a servo motor A (19) works, the telescopic cylinders A (17) drive the rectangular moving plate (12) and the upper chamber (12) connected to the upper chamber moving plate (12) 22) Move up or down along the four vertical sliding bars (13) together with the vertical sliding sleeve (11).
6. A method for using a control system based on the heat transfer effect testing device of any one of claims 1-5, which is characterized by comprising the following steps:
s1, before detection, placing a material sample (21) with a specified size on the middle heat-insulating layer (10) with the decorative surface facing upwards, and making one corner of the sample close to the sample corner positioning plate (43) and one long right-angle side of the sample close to the sample straight section positioning plate (39);
s2, a test start button in a display PLC (26) is pressed, each electric control component enters a working state, the PLC controls a servo motor B (42) to work, a telescopic cylinder B (34) is slowly descended, a left PT100 temperature sensor (37) and a right PT100 temperature sensor (38) are pressed on a sample, a tension spring (35) can ensure that the left PT100 temperature sensor (37) and the right PT100 temperature sensor (38) are in good contact with the upper surface of the sample, and simultaneously ensure that the lower surface of the sample is in good and compact contact with the upper surface of a middle heat insulation layer (10);
s3, displaying that the PLC (26) controls the servo motor A (19) to work, and extending the telescopic cylinder A (17) to enable the lower end of the periphery of the upper chamber (22) to be in contact with the upper end of the periphery of the middle heat insulation layer (10) and seal;
s4, displaying that the PLC (26) controls the electric heating element (4), the refrigerating machine (25) and the speed regulating fan (6) to work according to programming, when the temperature values transmitted to the PLC by the left PT100 temperature sensor (37) and the right PT100 temperature sensor (38) on the upper surface of the sample in the upper room space part (20) reach the reference temperature of the programmed set 20 ℃, the PLC starts to record the test time and controls the electric heating element (4), the refrigerating machine (25) and the speed regulating fan (6) to work, so that the temperature of the PT100 temperature sensor (7) for the lower room in the lower room space part (23) is raised to 70 ℃ and kept constant;
s5, the PLC (26) is displayed to record the average temperature and time of the left PT100 temperature sensor (37) and the right PT100 temperature sensor (38) on the upper surface of the sample at intervals of 15min until the temperature of the upper surface of the sample is stable;
s6, displaying that the PLC (26) obtains the heat conduction efficiency of the sample according to the upper surface temperature and the used time T when the sample is stable;
and S7, after detection is finished, the PLC (26) is displayed to send out an audio-visual prompt and control the servo motor A (19) to work, the telescopic cylinder A (17) is shortened, the working upper chamber (22) is lifted, the PLC (26) also controls the servo motor B (42) to work at the same time, the telescopic cylinder B (34) is made to extend to work, the support shaft (32) at the top of the telescopic cylinder B (34) supports the front side of the swinging rod (27), the left PT100 temperature sensor (37) and the right PT100 temperature sensor (38) are made not to press and hold the sample any more, and the PLC (26) is displayed to send out an audio-visual prompt of 'taking the sample away' and then close the relevant electric control to wait for putting in again.
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