Roller wall temperature measuring device with self-protection function for roller cut-tobacco dryer

Abstract

The invention belongs to the technical field of tobacco processing, and relates to a roller cut-tobacco dryer cylinder wall temperature measuring device with a self-protection function, which comprises a cut-tobacco dryer cylinder body, a thermal resistor and an elastic connection probe, the cut-tobacco dryer cylinder is cylindrical, the thermal resistor is tile-shaped, and the radius of the inner arc surface of the thermal resistor is equal to the radius of the outer cylinder of the cut-tobacco dryer cylinder; the plurality of thermal resistors are spliced in sequence and surround the outer cylinder wall of the cut-tobacco dryer cylinder, every two adjacent thermal resistors are electrically insulated, and the inner arc surfaces of the thermal resistors are attached to the outer cylinder wall of the cut-tobacco dryer cylinder; the number of the elastic connecting probes is at least two, and the distance between the temperature measuring parts of the two adjacent elastic connecting probes is smaller than the chord length of the outer arc surface of a single thermal resistor. The elastic connection probe is connected with a wire which is used for measuring resistance and temperature of the thermal resistor. When the temperature is measured, the temperature measuring part of the elastic connection probe touches the outer arc surface of the thermal resistor and then sequentially measures the resistance value and the temperature value of the thermal resistor. The device can stably and accurately measure the temperature of the drum wall of the drum cut-tobacco dryer for a long time.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing and relates to a temperature measuring device for a drum wall of a tobacco drying machine with a self-protection function. Background Art

[0002] In tobacco processing, cut tobacco drying involves heating and ventilation to reduce the moisture content and improve its physical properties. It is a critical step in the tobacco production process, directly impacting the quality, flavor, and stability of cigarettes during subsequent packaging and storage. Drum dryers are essential equipment for drying cut tobacco and reducing its moisture content. They typically utilize either co-current or counter-current hot air heating. The rotating drum uniformly heats the tobacco in the hot air, evaporating moisture. Currently, two methods are used to measure the temperature of the dryer drum wall: contact and non-contact.

[0003] However, when contact temperature measurement obtains the temperature through direct contact of the temperature probe with the drum wall, the contact temperature measurement device on the drum wall of the tobacco drying machine will cause the temperature measurement accuracy to decrease due to vibration and long-term friction between the probe and the drum wall during equipment operation, and the equipment needs to be maintained frequently; non-contact temperature measurement uses infrared and other technologies to measure the drum wall temperature, but there is a large amount of dust in the tobacco processing environment. At the same time, oxidation and fouling on the drum wall surface will seriously interfere with the temperature measurement signal, making it difficult for the measurement data to remain stable and accurate for a long time.

[0004] Therefore, a stable, easy-to-maintain and accurate cylinder wall temperature measurement method is needed to solve the above technical problems. Summary of the Invention

[0005] The technical solution adopted by the present invention to solve the technical problem is: a self-protective drum tofu drying machine cylinder wall temperature measuring device, comprising: a tofu drying machine cylinder, a thermal resistor, and an elastic connection probe; the tofu drying machine cylinder is cylindrical, the thermal resistor is tile-shaped, and the radius of the inner arc surface of the thermal resistor is equal to the radius of the outer cylinder of the tofu drying machine cylinder;

[0006] Multiple thermal resistors are sequentially spliced ​​around the outer wall of the tofu drying machine cylinder, with adjacent thermal resistors electrically insulated from each other and their inner arc surfaces in contact with the outer wall of the tofu drying machine cylinder. At least two elastic connection probes are provided, with the spacing between the temperature measuring portions of adjacent elastic connection probes being less than the chord length of the outer arc surface of a single thermal resistor. The elastic connection probes are connected to wires for measuring the resistance and temperature of the thermal resistors.

[0007] When measuring temperature, the temperature measuring portion of the elastic connection probe touches the outer arc surface of the thermal resistor and measures the resistance value and temperature value of the thermal resistor in sequence.

[0008] Preferably, a plurality of thermal resistors are connected end to end in sequence to surround the outer wall of the cylinder of the tofu drying machine, and an insulator is provided between two adjacent thermal resistors for spacing and insulation along the circumferential direction.

[0009] Preferably, the wire includes an impedance judgment line and a temperature detection line. The impedance judgment line is used to detect whether the thermistor currently touched by the elastic connection probe is the same thermistor, and the temperature detection line is used to detect the temperature value of the thermistor currently touched by the elastic connection probe.

[0010] Preferably, the temperature measuring device of the drum wire drying machine barrel wall also includes a fixed bracket, the wire drying machine barrel is rotatably mounted on the fixed bracket, a movable bracket is provided on the fixed bracket, and a spring is provided on the movable bracket. The spring radially presses the elastic connection probe from the outside to the inside toward the outer arc surface of the thermal resistor.

[0011] More preferably, the movable bracket is provided with a tubular outer sleeve, the elastic connection probe is connected to a columnar inner sleeve, and the outer sleeve is arranged radially in the length direction; the inner sleeve is slidably connected in the tube of the outer sleeve, and the inner sleeve can slide back and forth along the length direction of the outer sleeve.

[0012] More preferably, the end of the inner sleeve away from the elastic connection probe extends out of the outer sleeve, and the outer sleeve is provided with a limit switch, and the contact of the limit switch is located within the telescopic travel range of the end of the inner sleeve away from the elastic connection probe;

[0013] The movable bracket is slidably connected to the fixed bracket, the fixed bracket is provided with an electric cylinder, the fixed part of the electric cylinder is fixedly connected to the fixed bracket, the telescopic part of the electric cylinder is radially telescopic, and the telescopic part of the electric cylinder is fixedly connected to the movable bracket; the electric cylinder is electrically connected to the limit switch.

[0014] More preferably, the outer sleeve is in the shape of a circular tube, the inner sleeve is in the shape of a cylinder, and an annular step is provided on the cylindrical surface of the inner sleeve. One end of the spring is connected to the elastic connection probe connection at the lower end of the inner sleeve, and the other end of the spring rests against the lower end of the step or the lower closing part of the outer sleeve.

[0015] Preferably, a plurality of sets of thermal resistors and elastic connection probes are provided on the outer circumference of the cylinder of the tofu drying machine and respectively surround the cylinder of the tofu drying machine.

[0016] Preferably, the elastic connection probe temperature measuring part is in the shape of a cylindrical roller, the elastic connection probe temperature measuring part is rotatably connected to the elastic connection probe, and the rotation axis of the elastic connection probe temperature measuring part is parallel to the rotation axis of the tofu drying machine barrel.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention effectively solves the vibration failure problem of contact temperature measurement through elastic contact + four-wire measurement; the elastic probe is elastically connected to the arc-shaped thermal resistor through a spring, and the vibration energy can be largely absorbed by the spring preload.

[0019] 2. The active protection mechanism of the present invention can respond quickly. When the vibration of the cylinder causes the inner sleeve of the movable bracket to move beyond a certain distance, the limit switch triggers the electric cylinder to lift the probe within 50ms, avoiding continuous impact damage to the temperature measurement system. Therefore, the present invention can effectively increase the service life of the components of the cylinder wall temperature measuring device of the drum tofu drying machine.

[0020] 3. The present invention uses a circumferential temperature measuring ring composed of an arc-shaped thermal resistor and an insulating layer that is close to the cylinder wall, and cooperates with elastically connected dual probes to achieve 360° continuous temperature measurement without blind spots through the "dual probes simultaneously contacting the same thermal resistor" trigger mechanism, which can more accurately measure the actual temperature of the cylinder wall of the tofu drying machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a temperature measuring device for the drum wall of a tofu drying machine with a self-protection function according to the present invention;

[0022] Figure 2 Schematic diagram of the inner sleeve and outer sleeve of the present invention;

[0023] Figure 3 It is a schematic diagram of the installation position of the drum wall of the silk drying machine of the present invention.

[0024] In the figure, 1. Tofu drying machine barrel; 2. Fixed bracket; 3. Movable bracket; 4. Limit switch; 5. Electric cylinder; 6. Spring; 7. Insulator; 8. Thermal resistor; 9. Elastic connection probe; 10. Outer sleeve; 11. Inner sleeve; 12. Closure; 13. Step; 14. Wire. DETAILED DESCRIPTION

[0025] The following will provide a clear and complete description of the relevant technologies in the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] refer to Figures 1 to 3 As shown, in this specific embodiment, a self-protection function of the drum wire drying machine cylinder wall temperature measuring device includes: a wire drying machine cylinder 1, a thermal resistor 8, and an elastic connection probe 9; the wire drying machine cylinder 1 is cylindrical, the thermal resistor 8 is tile-shaped, and the radius of the inner arc surface of the thermal resistor 8 is equal to the radius of the outer cylinder of the wire drying machine cylinder 1; a plurality of thermal resistors 8 are sequentially spliced ​​around the outer cylinder wall of the wire drying machine cylinder 1, and two adjacent thermal resistors 8 are electrically insulated, and the inner arc surfaces of the thermal resistors 8 are in contact with the outer cylinder wall of the wire drying machine cylinder 1; the thermal resistors 8 are in contact with the outer cylinder wall, and the resistance value of the thermal resistors 8 changes with the change of the outer cylinder wall temperature. After detecting the change in the resistance value of the thermal resistors 8 and converting it, the cylinder wall temperature of the wire drying machine cylinder 1 can be obtained;

[0027] At least two elastic connection probes 9 are provided, and the spacing between the temperature measuring portions of two adjacent elastic connection probes 9 is less than the chord length of the outer arc surface of a single thermal resistor 8. The elastic connection probes 9 are connected to a wire 14, which is used to measure the resistance and temperature of the thermal resistor 8. The elastic connection probes 9 are configured and used in pairs, and are connected to two pairs of detection wires 14. Because the spacing between the temperature measuring portions of the two elastic connection probes 9 is less than the distance between the two ends of the arc of the thermal resistor 8, the two elastic connection probes 9 are electrically conductive when they contact the same thermal resistor 8 at the same time, and electrically disconnected when they contact two adjacent thermal resistors 8 respectively. When the two elastic connection probes 9 contact the same thermal resistor 8 at the same time, the temperature measuring wire 14 detects the resistance value of the thermal resistor 8 and converts it into the wall temperature of the silk drying machine cylinder 1. As the silk drying machine cylinder 1 continues to rotate, the elastic connection probes 9 complete the detection of the thermal resistors 8 around the entire circumference of the silk drying machine cylinder 1, and the wall temperature of the entire circumference of the silk drying machine cylinder 1 is obtained.

[0028] When measuring temperature, the temperature measuring part of the elastic connection probe 9 touches the outer arc surface of the thermal resistor 8 and then measures the resistance value and temperature value of the thermal resistor 8 in sequence; the resistance measuring wire 14 first detects whether the two elastic connection probes 9 are in contact with the same thermal resistor 8 at the current time point. If the resistance value is greater than a certain threshold, it can be determined that the two elastic connection probes 9 are electrically disconnected, that is, the two elastic connection probes 9 are in contact with different thermal resistors 8, and the temperature measuring wire 14 does not measure the resistance; if the resistance value is less than a certain threshold, it can be determined that the two elastic connection probes 9 are electrically connected, that is, the two elastic connection probes 9 are in contact with the same thermal resistor 8, and the temperature measuring wire 14 performs resistance measurement to measure the specific resistance value or resistance change of the thermal resistor 8, thereby obtaining the cylinder wall temperature of the tofu drying machine cylinder 1 in the area where the thermal resistor 8 is in contact.

[0029] Furthermore, multiple thermal resistors 8 are connected end to end in sequence to surround the outer cylinder wall of the silk drying machine cylinder 1, and an insulator 7 is provided between two adjacent thermal resistors 8 for spacing and insulation along the circumferential direction; they are connected end to end in sequence and an insulator 7 is provided between adjacent thermal resistors 8, so that the outer circumference of the multiple thermal resistors 8 is more continuous and smooth to form a complete outer circle, so that the sliding contact between the test part of the elastic connection probe 9 and the outer circumference of the thermal resistor 8 is smoother and softer, avoiding abnormal wear of the test part of the elastic connection probe 9 and improving measurement accuracy, and preventing electrical conduction between the two adjacent thermal resistors 8, thereby affecting the measurement accuracy.

[0030] Furthermore, the wire 14 includes an impedance judgment line and a temperature detection line. The impedance judgment line is used to detect whether the thermistor 8 currently touched by the elastic connection probe 9 is the same thermistor, and the temperature detection line is used to detect the temperature value of the thermistor 8 currently touched by the elastic connection probe 9.

[0031] Furthermore, the temperature measuring device of the drum wire drying machine barrel wall also includes a fixed bracket 2, the wire drying machine barrel 1 is rotatably mounted on the fixed bracket 2, the fixed bracket 2 is provided with a movable bracket 3, and the movable bracket 3 is provided with a spring 6. The spring 6 radially presses the elastic connection probe 9 from the outside to the inside toward the outer arc surface of the thermal resistor 8.

[0032] Furthermore, the movable bracket 3 is provided with a tubular outer sleeve 10, and the elastic connection probe 9 is connected to the columnar inner sleeve 11, and the length direction of the outer sleeve 10 is arranged radially; the inner sleeve 11 is slidably connected in the tube of the outer sleeve 10, and the inner sleeve 11 can slide back and forth along the length direction of the outer sleeve 10; the outer sleeve 10 and the inner sleeve 11 are set separately, and the inner sleeve 11 is then connected to the elastic connection probe 9, which makes the production, processing and maintenance of the drum wall temperature measuring device of the drum silk drying machine more convenient, and the processing and use costs are lower.

[0033] Furthermore, the end of the inner sleeve 11 away from the elastic connection probe 9 extends out of the outer sleeve 10, and the outer sleeve 10 is provided with a limit switch 4, and the contact of the limit switch 4 is located within the telescopic travel range of the end of the inner sleeve 11 away from the elastic connection probe 9;

[0034] The movable bracket 3 is slidably connected to the fixed bracket 2, and an electric cylinder 5 is provided on the fixed bracket 2. The fixed part of the electric cylinder 5 is fixedly connected to the fixed bracket 2, and the telescopic part of the electric cylinder 5 is telescoped radially outward, and the telescopic part of the electric cylinder 5 is fixedly connected to the movable bracket 3; the electric cylinder 5 is electrically connected to the limit switch 4; the travel switch is used to monitor whether the bounce or vibration of the elastic connection probe 9 exceeds the threshold. When the bounce or vibration of the elastic connection probe 9 is too large, the electric cylinder 5 is telescoped to move the entire movable bracket 3 and the elastic connection probe 9 out radially, so that the test end of the elastic connection probe 9 no longer contacts the outer arc surface of the thermal resistor 8, thereby protecting the elastic connection probe 9.

[0035] Furthermore, the outer sleeve 10 is in the shape of a circular tube, the inner sleeve 11 is in the shape of a cylinder, and an annular step 13 is provided on the cylindrical surface of the inner sleeve 11. One end of the spring 6 is connected to the connection of the elastic connection probe 9 at the lower end of the inner sleeve 11, and the other end of the spring 6 is against the lower end of the step 13 or the lower closing 12 of the outer sleeve 10; the spring 6 is used to press the elastic connection probe 9 to the outer arc surface of the thermal resistor 8, and at the same time ensure that the upper end of the inner sleeve 11 can touch the start limit switch 4 only when the jump or vibration of the elastic connection probe 9 does exceed the threshold value, so as to prevent misjudgment.

[0036] Furthermore, multiple sets of thermal resistors 8 and elastic connection probes 9 are provided on the outer circumference of the wire drying machine cylinder 1, respectively surrounding the outside of the wire drying machine cylinder 1; the combination of multiple sets of thermal resistors 8 and elastic connection probes 9 can monitor the cylinder wall temperature of multiple areas along the axial length of the entire wire drying machine cylinder 1.

[0037] Furthermore, the temperature measuring part of the elastic connection probe 9 is in the shape of a cylindrical roller, and the temperature measuring part of the elastic connection probe 9 is rotatably connected to the elastic connection probe 9, and the rotation axis of the temperature measuring part of the elastic connection probe 9 is parallel to the rotation axis of the silk drying machine barrel 1; the sliding contact of the temperature measuring part of the elastic connection probe 9 is changed to rolling contact, so that the wear of the temperature measuring part of the elastic connection probe 9 and the thermal resistor 8 is smaller, the frictional heat is smaller, and the measurement accuracy is higher.

[0038] Example

[0039] The self-protection drum wire drying machine barrel wall temperature measuring device of this embodiment has an active protection mechanism and can stably and accurately measure the temperature of the wire drying machine barrel wall. It mainly consists of an arc-shaped thermal resistor 8 that fits the barrel wall, an insulator 7, an elastic connection probe 9, a fixed bracket 2, a movable bracket 3, a movable bracket driving electric cylinder 5, and a limit switch 4.

[0040] Thermal resistors 8 and insulators 7 are alternately spaced around the drying drum 1. The length of the thermal resistors 8 is greater than the spacing between the two elastic probes 9. Four conductors 14, I+, V+, I-, and V-, are integrated into the two elastic probes 9, respectively. These conductors 14 are insulated with a high-temperature-resistant silicone outer layer and contain stranded, silver-plated copper wires. These conductors 14 are routed through the hollow interior of the spring 6. The spring preload of the spring 6 ensures close contact with the arc-shaped thermal resistor 8. The contact terminals of the elastic probes 9 feature micro-bumps to enhance contact reliability. During drum rotation, if two elastic probes 9 are simultaneously within the area of ​​the same thermal resistor 8, four-wire temperature measurement can be performed on that thermal resistor 8. The signal processing is as follows: the system detects the impedance between V+ and V- to determine whether the two probes are simultaneously contacting the same thermal resistor. If and only if both probes are simultaneously contacting the same thermal resistor (impedance < 100Ω), four-wire measurement is initiated, along with simultaneous temperature acquisition. When the tofu drying machine barrel 1 vibrates too much during operation, the inner sleeve 11 of the movable bracket 3 will touch the limit switch 4. At this time, the bracket driving electric cylinder 5 will receive the signal and run. Under the support of the step 13 on the inner sleeve 11 of the movable bracket 3 and the closing edge 12 at the bottom of the outer sleeve 10, the elastic contact temperature measuring part on the movable bracket 3 will be lifted, thereby protecting the system.

[0041] In summary, the present invention effectively solves the vibration failure problem of contact temperature measurement through elastic contact + four-wire measurement; the elastic probe is elastically connected to the arc-shaped thermal resistor through a spring, and the vibration energy can be absorbed to a large extent through the spring preload. Therefore, the present invention can measure the drum wall temperature of the silk drying machine stably and accurately for a long time.

[0042] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A self-protection device for measuring the temperature of the drum wall of a tofu drying machine, characterized in that: include: A wire drying machine barrel (1), a thermal resistor (8), and an elastic connection probe (9); the wire drying machine barrel (1) is cylindrical, the thermal resistor (8) is tile-shaped, and the radius of the inner arc surface of the thermal resistor (8) is equal to the radius of the outer cylinder of the wire drying machine barrel (1); A plurality of thermal resistors (8) are sequentially spliced ​​around the outer wall of the silk drying machine barrel (1), two adjacent thermal resistors (8) are electrically insulated, and the inner arc surface of the thermal resistor (8) fits the outer wall of the silk drying machine barrel (1); At least two elastic connection probes (9) are provided, and the distance between the temperature measuring parts of two adjacent elastic connection probes (9) is smaller than the chord length of the outer arc surface of a single thermal resistor (8); The elastic connection probe (9) is connected to a wire (14), and the wire (14) is used to measure the resistance and temperature of the thermal resistor (8); When measuring temperature, the temperature measuring portion of the elastic connection probe (9) touches the outer arc surface of the thermal resistor (8) and measures the resistance value and temperature value of the thermal resistor (8) in sequence.

2. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 1 is characterized in that: A plurality of thermal resistors (8) are sequentially connected end to end to surround the outer wall of the fiber drying machine cylinder (1); an insulator (7) is provided between two adjacent thermal resistors (8) to provide spacing and insulation along the circumferential direction.

3. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 1 is characterized in that: The lead (14) includes an impedance judgment line and a temperature detection line. The impedance judgment line is used to detect whether the thermal resistor (8) currently touched by the elastic connection probe (9) is the same thermal resistor. The temperature detection line is used to detect the temperature value of the thermal resistor (8) currently touched by the elastic connection probe (9).

4. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 1, characterized in that: The temperature measuring device for the drum wire drying machine cylinder wall further comprises a fixed bracket (2), the wire drying machine cylinder (1) is rotatably mounted on the fixed bracket (2), a movable bracket (3) is provided on the fixed bracket (2), and a spring (6) is provided on the movable bracket (3), and the spring (6) presses the elastic connection probe (9) radially from the outside to the inside toward the outer arc surface of the thermal resistor (8).

5. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 4 is characterized in that: The movable bracket (3) is provided with a tubular outer sleeve (10), and the elastic connection probe (9) is connected to a columnar inner sleeve (11), and the length direction of the outer sleeve (10) is arranged radially; the inner sleeve (11) is slidably connected in the tube of the outer sleeve (10), and the inner sleeve (11) can slide back and forth along the length direction of the outer sleeve (10).

6. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 5, characterized in that: The end of the inner sleeve (11) away from the elastic connection probe (9) extends out of the outer sleeve (10), and the outer sleeve (10) is provided with a limit switch (4), and the contact of the limit switch (4) is located within the telescopic travel range of the end of the inner sleeve (11) away from the elastic connection probe (9); The movable bracket (3) is slidably connected to the fixed bracket (2); an electric cylinder (5) is provided on the fixed bracket (2); a fixed portion of the electric cylinder (5) is fixedly connected to the fixed bracket (2); a telescopic portion of the electric cylinder (5) is radially telescopic outward; the telescopic portion of the electric cylinder (5) is fixedly connected to the movable bracket (3); and the electric cylinder (5) is electrically connected to the limit switch (4).

7. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 5, characterized in that: The outer sleeve (10) is in the shape of a circular tube, the inner sleeve (11) is in the shape of a cylinder, an annular step (13) is provided on the cylindrical surface of the inner sleeve (11), one end of the spring (6) is connected to the elastic connection probe (9) connection at the lower end of the inner sleeve (11), and the other end of the spring (6) abuts against the lower end of the step (13) or the lower closing end (12) of the outer sleeve (10).

8. The self-protection temperature measuring device for the drum wall of a tofu drying machine according to claim 1, characterized in that: A plurality of sets of thermal resistors (8) and elastic connection probes (9) are provided on the outer circumference of the silk drying machine cylinder (1) and respectively surround the outside of the silk drying machine cylinder (1).

9. The self-protective temperature measuring device for the drum wall of a tofu drying machine according to claim 1, characterized in that: The temperature measuring part of the elastic connection probe (9) is in the shape of a cylindrical roller. The temperature measuring part of the elastic connection probe (9) is rotatably connected to the elastic connection probe (9). The rotation axis of the temperature measuring part of the elastic connection probe (9) is parallel to the rotation axis of the silk drying machine barrel (1).

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