Mine intrinsic safety type temperature sensor

Abstract

The utility model discloses a mine intrinsic safety type temperature sensor. The mine intrinsic safety type temperature sensor is characterized by comprising a shell, an optical filter, a sealing ring, an infrared temperature sensing element, an inner pressing sleeve, a cable and a cable waterproof joint, a through hole is formed in the shell; an optical filter, a sealing ring, an infrared temperature sensing element, an inner pressing sleeve and a cable waterproof connector are sequentially installed in the through hole. The front end of the through hole is provided with a measuring port and a step blocking surface; a middle threaded hole section in threaded fit with the inner pressing sleeve and a rear threaded hole section in threaded fit with the cable waterproof joint are arranged in the through hole; the infrared temperature sensing element, the sealing ring and the optical filter are sequentially abutted through the inner pressing sleeve, and the optical filter is blocked and limited by the step blocking surface; the front end of the cable is connected with the infrared temperature sensing element. According to the utility model, non-contact temperature detection can be realized, the performance is stable, the use capability of dust prevention and water invasion prevention is satisfied, the I P54 protection grade is reached, and the temperature sensor has the advantages of small size, light weight, good sealing performance and the like.

Description

Technical Field

[0001] The utility model relates to a mine intrinsically safe temperature sensor. Background Art

[0002] The mine intrinsically safe temperature sensor is a sensor used to monitor the underground environment or the working temperature of the equipment. It can display the temperature measurement value on site and output a standard signal or provide remote collection. It is often used in coal mines with gas and coal dust explosion hazards. It is used in conjunction with the main host of the belt conveyor protection device and measures the temperature of the belt conveyor. When the measured temperature exceeds the set value, it outputs an over-temperature alarm signal. The mine intrinsically safe temperature sensor is often used to detect the belt temperature of the belt conveyor to achieve over-temperature alarm protection for the belt conveyor.

[0003] In view of the surface temperature characteristics of various parts of the coal mine belt conveyor: the front end of the coal mine belt conveyor includes components such as drive wheels, steering steel wheels, guide rollers, and transmission mechanisms. These components are subject to greater loads and friction during operation, and the surface temperature is prone to rise. Since a large amount of power needs to be transmitted, a higher surface temperature will be generated. According to measured data, under normal circumstances, the surface temperature of the front end should be controlled at around 50°C. The middle section of the coal mine belt conveyor includes components such as rollers, brackets, and tensioning devices. These components are subject to multiple forces such as the weight, impact, and friction of the material during operation, which can easily lead to excessive surface temperature. Especially when used in a high temperature environment, the surface temperature of the middle section is prone to rise, and local overheating and wear may occur; the tail end of the coal mine belt conveyor includes components such as tensioning devices, brackets, positioners, and vertical elbows. These components are subject to multiple forces such as the falling impact, extrusion, and bending of the material during operation, and the surface temperature is prone to rise. Especially when used in special environments such as high temperature and humidity, the surface temperature of the tail end may rise to above 60°C. The surface temperature of each part of the belt conveyor is one of the important monitoring indicators for the normal and safe operation of the equipment. It is necessary to strengthen temperature monitoring and maintenance work, discover and solve problems in time, and ensure the safe, normal and efficient operation of the equipment.

[0004] When testing the rotating parts on the coal mine belt conveyor, the temperature probe of the conventional mine intrinsically safe temperature sensor cannot be installed on the object to be measured, but can only be as close to it as possible (i.e. non-contact temperature detection). The temperature probe can only receive the signal when the object to be measured produces an extremely high temperature difference, which also has great safety risks and poor accuracy.

[0005] The most recent prior art retrieved to this application is a mine intrinsically safe infrared temperature sensor (CN207395899U), which includes a cable fastening device, a housing, a cable, an operation detection circuit, an infrared temperature sensing element and a measurement window. The housing is provided with a detection circuit installation cavity, and the circuit installation cavity is provided with an operation detection circuit. One side of the operation detection circuit is connected to an infrared temperature sensing element. The operation detection circuit is used to convert the signal detected by the infrared temperature sensing element to an external device after operation amplification and post-processing. The infrared temperature sensing element is used to convert the temperature signal into an electrical signal. A measurement window is provided at the infrared temperature sensing element. The other side of the operation detection circuit is connected to a cable, and the cable is clamped to the end of the housing through a cable fastening device. It can realize non-contact infrared temperature detection of a rotating object to be measured. However, compared with this application, it still has the following deficiencies and is explained as follows:

[0006] First, since the infrared temperature sensing element in the above-mentioned prior art has no protection and sealing between the housing and the measuring window, and there is a lot of dust in the underground environment and when the belt conveyor is working, the dust enters the measuring window and adheres to the infrared temperature sensing element, affecting normal operation and service life, and is difficult to clean; at the same time, it is limited in use in special environments such as humidity, and cannot meet the use conditions requirements of dustproof and waterproof intrusion (IP54 protection level);

[0007] Second, since the measuring window in the above-mentioned prior art is cylindrical, the infrared sensing range is small, which reduces the sensing range and reduces the sensitivity;

[0008] Thirdly, the infrared temperature sensing element and the calculation detection circuit in the above-mentioned prior art may loosen axially in the housing toward the cable fastening device;

[0009] Fourth, in the above-mentioned prior art, an external thread section is provided on the outer wall of the shell, and two fixing nuts are screwed into the external thread section, and the two fixing nuts are used to fix the sensor to the mounting bracket or the mounting hole; and when coal ash adheres to the external thread section (screw thread), the fixing nuts are stuck and there is a problem that they cannot be removed or are difficult to remove. Utility Model Content

[0010] The utility model provides a mine intrinsically safe temperature sensor, which can solve the problem that the infrared temperature sensing element in the prior art has no protection and seal between the housing and the measuring window, so that dust and the like can easily enter the measuring window and adhere to the infrared temperature sensing element, thus affecting normal operation and service life and causing trouble in cleaning; at the same time, the use is limited in special environments such as humidity, and cannot meet the use conditions of dust and water intrusion.

[0011] (IP54 protection level) technical issues.

[0012] To achieve the above-mentioned purpose, the utility model provides a mine intrinsically safe temperature sensor, characterized in that it includes an outer shell, a filter, a sealing ring, an infrared temperature sensing element, an internal pressure sleeve, a cable waterproof connector and a cable; a through hole is provided in the outer shell; the filter, the sealing ring, the infrared temperature sensing element, the internal pressure sleeve and the cable waterproof connector are installed in sequence in the through hole; a measuring port is provided at the front end of the through hole and a step blocking surface is provided at the inner end of the measuring port; the through hole has a middle threaded hole section for threaded cooperation with the internal pressure sleeve and a rear threaded hole section for threaded cooperation with the cable waterproof connector; and the infrared temperature sensing element, the sealing ring and the filter are pressed tightly in sequence through the internal pressure sleeve and the filter is blocked and limited by the step blocking surface; the front end of the cable is connected to the infrared temperature sensing element after passing through the cable waterproof connector.

[0013] By adopting the above technical solution, since the infrared temperature sensing element is sealed between the housing and the measuring port by the combination of the filter and the sealing ring, dust in the underground environment and when the belt conveyor is working enters the measuring port and is blocked by the filter and adheres to and contacts the infrared temperature sensing element. At the same time, the filter abuts against the step blocking surface and is sealed inside the sealing ring, so that water vapor cannot enter the housing and contact the infrared temperature sensing element. Therefore, the normal operation of the infrared temperature sensing element can be guaranteed, and the performance is stable for a long time. At the same time, the outer surface of the filter and the inside of the measuring port can be directly wiped and cleaned, which is very simple. Therefore, the problem that the infrared temperature sensing element in the above-mentioned prior art has no protection and sealing between the housing and the measuring window, so that dust and the like easily enter the measuring window and adhere to the infrared temperature sensing element, thereby affecting the normal operation and service life and causing trouble in cleaning can be solved.

[0014] In addition, since the cable waterproof connector is threadedly matched with the rear threaded hole section of the perforation, the cable waterproof connector can achieve sealing of the cable passing through to prevent water and dust. And since the inner pressure sleeve is threadedly matched with the middle threaded hole section of the perforation, the inner pressure sleeve is rotated and displaced forward to achieve the infrared temperature sensing element, the sealing ring and the filter being pressed in sequence, and the filter being blocked and limited by the step blocking surface; it can ensure that the sealing ring and the filter are squeezed to maintain the seal, and at the same time limit the loosening of the external temperature sensing element, the sealing ring and the filter from moving backward. Therefore, this mine intrinsically safe temperature sensor can be used normally in special environments such as mines and humidity, and can meet the use conditions requirements of dustproof and water intrusion (IP protection level). At the same time, its use is limited in special environments such as humidity, and cannot meet the use conditions requirements of dustproof and water intrusion.

[0015] (IP protection grade); and also solves the problem of loosening of the infrared temperature sensing element in the housing in the above-mentioned prior art.

[0016] Preferably, the perforation includes a measuring port, a cylindrical hole section, a middle threaded hole section and a rear threaded hole section which are arranged in sequence; wherein the step blocking surface is provided at the junction of the measuring port and the cylindrical hole section; and the filter, sealing ring and infrared temperature sensing element are installed in the cylindrical hole section.

[0017] Preferably, the measuring port is a tapered orifice.

[0018] Preferably, the sealing ring is made of rubber material.

[0019] Preferably, the filter is used to transmit only near infrared light with a wavelength in the range of 780-2500 nm.

[0020] Preferably, the outer wall of the inner pressure sleeve is provided with an external thread matching the middle threaded hole section; and the inner pressure sleeve is provided with a tool bayonet at one end facing away from the infrared temperature sensing element.

[0021] Preferably, the infrared temperature sensing element adopts the DC14852401 model.

[0022] Preferably, the cable waterproof connector adopts M20 model.

[0023] Preferably, the outer shell is cylindrical in shape; an annular groove is provided in the middle of the outer wall of the outer shell; a clamp is inserted into the annular groove; and the two connecting ends of the clamp are fixedly connected to the L-shaped plate by a bolt and nut assembly.

[0024] Preferably, the outer end of the cable is connected to a display box; a circuit board is arranged in the display box; the circuit board is used to process the temperature signal collected by the infrared temperature sensing element and output an electrical signal.

[0025] Beneficial effects of the utility model:

[0026] First, the utility model is sealed between the infrared temperature sensing element in the housing and the measuring port by a filter and a sealing ring combination, and dust in the underground environment and when the belt conveyor is working enters the measuring port and is blocked by the filter and attached to and contacted with the infrared temperature sensing element. At the same time, the filter abuts against the step blocking surface and is sealed inside the sealing ring, so that water vapor cannot enter the housing and contact the infrared temperature sensing element, thereby ensuring the normal operation of the infrared temperature sensing element and long-term stable performance. At the same time, the outer surface of the filter and the inside of the measuring port can be directly wiped and cleaned, which is very simple;

[0027] Second, the utility model can seal the cable through the cable waterproof connector and prevent water and dust because the cable waterproof connector is threadedly matched with the rear threaded hole section of the perforation; and the inner pressure sleeve is threadedly matched with the middle threaded hole section of the perforation, and the inner pressure sleeve is rotated and moved forward to lock, so that the infrared temperature sensing element, the sealing ring and the filter are pressed in sequence, and the filter is blocked and limited by the step blocking surface; it can ensure that the sealing ring and the filter are squeezed and sealed, and at the same time limit the loosening of the external temperature sensing element, the sealing ring and the filter backward displacement, so the mine intrinsically safe temperature sensor can be used normally in special environments such as mines and humidity, and can meet the use conditions of dustproof and waterproof intrusion requirements IP protection level;

[0028] Thirdly, since the measuring port of the utility model is a conical orifice, the infrared sensing range of the infrared temperature sensing element becomes larger, the sensing range is expanded and the sensitivity is greatly improved;

[0029] Fourthly, the utility model can also have the advantages of small size, light weight, good sealing performance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1-2 It is a cross-sectional view of a mine intrinsically safe temperature sensor in Embodiment 1 of the present utility model.

[0031] Figure 3 It is a left view of a mine intrinsically safe temperature sensor in the first embodiment of the utility model.

[0032] Figure 4 It is a split explosion diagram of a mine intrinsically safe temperature sensor in Example 1 of the utility model.

[0033] Figure 5-6 It is a schematic diagram of the structure of the shell.

[0034] Figure 7-8 It is a structural schematic diagram of the inner pressure sleeve.

[0035] Fig. 9 It is a stereoscopic diagram of a mine intrinsically safe temperature sensor in the second embodiment of the utility model.

[0036] Fig.10 It is a schematic diagram of the structure of the display box.

[0037] Fig.11 It is a schematic diagram of the structure inside the display box. DETAILED DESCRIPTION

[0038] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0039] Example 1: See Figure 1-8, a mine intrinsically safe temperature sensor, comprising a housing 1, a filter 2, a sealing ring 3, an infrared temperature sensing element 4, an inner pressure sleeve 5, a cable waterproof connector 6 and a cable 7;

[0040] See also Figure 1-2 The housing 1 is provided with a through hole 1-1; a filter 2, a sealing ring 3, an infrared temperature sensing element 4, an inner pressure sleeve 5 and a cable waterproof connector 6 are sequentially installed in the through hole 1-1.

[0041] The filter 2 is used to allow only infrared light to pass (transmit) and can filter out other types of light.

[0042] Among them, a measuring port 1-11 is provided at the front end of the through hole 1-1 and a step stop surface 1-111 is provided at the inner end of the measuring port 1-11.

[0043] The through hole 1-1 has a middle threaded hole section 1-13 for threaded cooperation with the inner pressure sleeve 5 and a rear threaded hole section 1-14 for threaded cooperation with the cable waterproof connector 6; the inner pressure sleeve 5 presses the infrared temperature sensing element 4, the sealing ring 3 and the filter 2 in sequence, and the filter 2 is blocked and limited by the step blocking surface 1-111; the front end of the cable 7 passes through the cable waterproof connector 6 and is connected to the infrared temperature sensing element 4.

[0044] See also Figure 5-6 In this embodiment, the through hole 1-1 includes a measuring port 1-11, a cylindrical hole section 1-12, a middle threaded hole section 1-13 and a rear threaded hole section 1-14 arranged in sequence; wherein the step stop surface 1-111 is provided at the junction of the measuring port 1-11 and the cylindrical hole section 1-12. Figure 1-2 The filter 2, the sealing ring 3, and the infrared temperature sensing element 4 are installed in the cylindrical hole section 1-12.

[0045] See also Figure 5 Specifically, the middle threaded hole section 1-13 adopts M12 internal thread. The rear threaded hole section 1-14 adopts M20*1.5 internal thread. The outer wall of the inner pressure sleeve 5 is provided with an external thread 5-1 (M12 external thread) matching the middle threaded hole section 1-13; the inner pressure sleeve 5 is provided with a tool bayonet 5-2 (which can be combined with the infrared temperature sensing element 4) at the end facing away from the infrared temperature sensing element 4. Figure 7-8 ).

[0046] See also Figure 1-2 Preferably, the measuring port 1-11 is a conical orifice. Since the conical orifice can enlarge the infrared sensing range, the sensing range is expanded and the sensitivity is greatly improved.

[0047] Preferably, the sealing ring 3 is made of rubber material. Specifically, the sealing ring 3 is an O-type sealing ring; the sealing ring 3 is interference fit with the inner wall of the cylindrical hole section 1-12.

[0048] Preferably, the filter 2 is used to transmit only near infrared light with a wavelength in the range of 780-2500nm, thereby filtering out interference from light of other wavelengths. Specifically, the filter 2 is circular, and the outer diameter of the filter 2 matches the inner diameter of the cylindrical hole segment 1-12 and has a clearance fit.

[0049] Specifically, the optical filter 2 can be directly purchased and is not described in detail because it adopts the existing technology.

[0050] Preferably, the infrared temperature sensing element 4 is of model DC14852401. The infrared temperature sensing element 4 can be directly purchased and is not described in detail because it adopts the existing technology.

[0051] Preferably, the cable waterproof connector adopts the M20 model. The cable waterproof connector can be directly purchased and is not described in detail because it adopts the existing technology.

[0052] Preferably, the outer shell 1 is cylindrical in shape; an annular groove 1-2 is provided in the middle of the outer wall of the outer shell 1; a clamp 8 is inserted into the annular groove 1-2; and the two connecting ends 8-1 of the clamp 8 are fixedly connected to the L-shaped plate 9 by a bolt and nut assembly 10.

[0053] In the product of this embodiment, the infrared temperature sensing element is sealed between the housing and the measuring port by a combination of a filter and a sealing ring. When the underground environment and the belt conveyor are working, dust enters the measuring port and is blocked by the filter and adheres to and contacts the infrared temperature sensing element. At the same time, the filter 2 abuts against the step blocking surface 1-111 and is sealed internally by the sealing ring 3, so that water vapor cannot enter the housing and contact the infrared temperature sensing element. Therefore, the normal operation of the infrared temperature sensing element can be guaranteed, and the performance is stable for a long time. At the same time, the outer surface of the filter and the inside of the measuring port can be directly wiped and cleaned, which is very simple. Therefore, the problem of the infrared temperature sensing element in the prior art having no protection and sealing between the housing and the measuring window, which causes dust to easily enter the measuring window and adhere to the infrared temperature sensing element, thereby affecting the normal operation and service life and causing trouble in cleaning, can be solved.

[0054] In addition, since the cable waterproof connector 6 is threadedly matched with the rear threaded hole section 1-14 of the perforation 1-1, the cable waterproof connector 6 can achieve sealing of the cable passing through to prevent water and dust, and the inner pressure sleeve 5 is threadedly matched with the middle threaded hole section 1-13 of the perforation 1-1, and the inner pressure sleeve 5 is rotated on the middle threaded hole section 1-13 and shifted forward to lock, so that the infrared temperature sensing element 4, the sealing ring 3 and the filter 2 are pressed in turn, and the filter 2 is blocked and limited by the step blocking surface 1-111; it can ensure that the sealing ring 3 and the filter 2 are squeezed and sealed, and at the same time, the external temperature sensing element 4, the sealing ring 3 and the filter 2 are limited to move backward and loose, so the intrinsically safe temperature sensor of this mine can be used normally in special environments such as mines and humidity, and can meet the use conditions of dustproof and waterproof intrusion requirements IP54 protection level. At the same time, it is limited in use in special environments such as humidity, and cannot meet the technical problem of IP54 protection level required for use conditions such as dust and water intrusion; at the same time, it also solves the problem of loose infrared temperature sensing elements in the casing in the above-mentioned prior art.

[0055] When in use, the intrinsically safe temperature sensor of this mine is connected to the control system (monitoring system) through the cable 7. The intrinsically safe temperature sensor of this mine can be fixedly installed through the L-shaped plate 9, so that the measuring ports 1-11 are close to the object to be measured, so that non-contact infrared temperature detection can be achieved. Its working principle is: when the ambient temperature of the object to be measured is higher, the more infrared rays are radiated, and the energy of the infrared radiation is stronger; and the infrared rays are irradiated to the infrared temperature sensing element 4 after passing through the filter 2, and the infrared temperature sensing element 4 causes the temperature to rise after receiving the radiation energy, and then the infrared temperature sensing element 4 causes a physical change of a non-electrical quantity, which can also be measured after being converted into an electrical quantity through appropriate changes. The infrared temperature sensing element 4 is connected to the control system (including operational amplifier circuits and digital-to-analog conversion circuits, etc., which are prior art and will not be described in detail) through the cable, and the infrared temperature sensing element converts the temperature signal into an electrical signal.

[0056] Specifically, Figure 6 As shown, the shell is 80 mm long and has an outer diameter of 28 mm, and its overall length is 108 mm (as shown in FIG. Figure 1 As shown), therefore, the mine intrinsically safe temperature sensor product of this embodiment can have the advantages of small size, light weight, good sealing performance, etc.

[0057] Example 2: See Fig. 9 This embodiment is based on the first embodiment, and the outer end of the cable 7 is further connected to the display box 11.

[0058] See also Figure 10-11 , wherein a circuit board 12 is disposed in the display box 11; the circuit board 12 is used to process the temperature signal collected by the infrared temperature sensing element 4 and output an electrical signal.

[0059] Specifically, the circuit board 12 is integrated with an amplifier circuit and a digital-to-analog conversion circuit.

[0060] See also Figure 10-11 In addition, a display transparent area 11 - 1 is provided on the side cover of the display box 11 ; a display module 12 - 1 is integrated on the circuit board 12 and corresponds to the position of the display transparent area 11 - 1 .

[0061] See also Figure 10-11 Furthermore, a hanging ring 13 is provided outside the display box 11 .

[0062] This embodiment can display the temperature signal sensed by the infrared temperature sensing element 4 on the display box 11, and can realize intuitive display after on-site detection.

[0063] In addition, the display box 11 can be equipped with two cable waterproof connectors 6, one for input cable installation and one for output cable connection. The cable waterproof connector 6 used as an output on the display box 11 can be remotely connected to the main control system (or main monitoring system).

[0064] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A mine intrinsically safe temperature sensor, characterized in that: It comprises a housing (1), a filter (2), a sealing ring (3), an infrared temperature sensing element (4), an inner pressure sleeve (5), a cable waterproof connector (6) and a cable (7); The housing (1) is provided with a through hole (1-1); a filter (2), a sealing ring (3), an infrared temperature sensing element (4), an inner pressure sleeve (5) and a cable waterproof connector (6) are sequentially installed in the through hole (1-1); The front end of the through hole (1-1) is provided with a measuring port (1-11), and the inner end of the measuring port (1-11) is provided with a step stop surface (1-111); the through hole (1-1) has a middle threaded hole section (1-13) for threaded engagement with the inner pressure sleeve (5) and a rear threaded hole section (1-14) for threaded engagement with the cable waterproof connector (6); The infrared temperature sensing element (4), the sealing ring (3) and the optical filter (2) are pressed tightly together in sequence through the inner pressure sleeve (5), and the optical filter (2) is blocked and limited by the step blocking surface (1-111); The front end of the cable (7) passes through the cable waterproof connector (6) and is connected to the infrared temperature sensing element (4).

2. A mine intrinsically safe temperature sensor as claimed in claim 1, characterized in that: The perforation (1-1) comprises a measuring port (1-11), a cylindrical hole section (1-12), a middle threaded hole section (1-13) and a rear threaded hole section (1-14) which are arranged in sequence; Wherein, the step stop surface (1-111) is provided at the junction of the measuring port (1-11) and the cylindrical hole section (1-12); The optical filter (2), the sealing ring (3) and the infrared temperature sensing element (4) are installed in the cylindrical hole section (1-12).

3. A mine intrinsically safe temperature sensor as claimed in claim 1, characterized in that: The measuring port (1-11) is a conical orifice.

4. A mine intrinsically safe temperature sensor as claimed in claim 1, characterized in that: The sealing ring (3) is made of rubber material.

5. The mine intrinsically safe temperature sensor according to claim 1, characterized in that: The optical filter (2) is used to allow only near infrared light with a wavelength in the range of 780-2500 nm to pass through.

6. A mine intrinsically safe temperature sensor as claimed in claim 1, characterized in that: The outer wall of the inner pressure sleeve (5) is provided with an external thread (5-1) matching the middle threaded hole section (1-13); the inner pressure sleeve (5) is provided with a tool bayonet (5-2) at the end facing away from the infrared temperature sensing element (4).

7. The mine intrinsically safe temperature sensor according to claim 1, characterized in that: The infrared temperature sensing element (4) adopts the DC14852401 model.

8. The mine intrinsically safe temperature sensor according to claim 1, characterized in that: The cable waterproof connector is of M20 type.

9. The mine intrinsically safe temperature sensor according to claim 1, characterized in that: The outer shell (1) is cylindrical in shape; an annular groove (1-2) is provided in the middle of the outer wall of the outer shell (1); a clamp (8) is sleeved inside the annular groove (1-2); The two connecting ends (8-1) of the clamp (8) are fixedly connected to the L-shaped plate (9) via a bolt and nut assembly (10).

10. The mine intrinsically safe temperature sensor according to claim 1, characterized in that: The outer end of the cable (7) is connected to a display box (11); a circuit board (12) is arranged inside the display box (11); the circuit board (12) is used to process the temperature signal collected by the infrared temperature sensing element (4) and output an electrical signal.

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