Pole production equipment

Abstract

The utility model provides a pole piece production device. The pole piece production device comprises an unwinding mechanism, a rewinding mechanism and an online moisture detection mechanism. The rewinding mechanism cooperates with the unwinding mechanism to convey the pole piece. The online moisture detection mechanism is arranged between the unwinding mechanism and the rewinding mechanism, and is used to detect the moisture content of the pole piece located between the unwinding mechanism and the rewinding mechanism. The pole piece production device can realize the online detection of the moisture content of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a pole piece production device. Background Art

[0002] In the production process of pole pieces, a coating machine is used to form a coating layer on the substrate, and a dryer is used to dry the coating layer, thereby obtaining a pole piece including a substrate and a coating layer. However, with the diversified development of the battery industry, some customers require single-sided wet film or semi-wet film shipments, and the pole piece needs to be dried to a moderate humidity level to control the moisture content of the pole piece within a reasonable range. In the field of pole piece production, some pole piece samples are usually randomly sampled and sent to the testing room, and then an appropriate amount of coating layer material is taken out from the pole piece to test the moisture content of the pole piece. This detection method is an offline detection method, and the detection requires a cumbersome process. During the process, the moisture content of the pole piece may change, resulting in a difference between the result and the real-time moisture content of the pole piece. It is also time-consuming, labor-intensive, and inefficient. The measurement results may also be different due to the non-fixed measurement location or different measurement personnel. Utility Model Content

[0003] The utility model provides a pole piece production device, which can realize online detection of the water content of the pole piece.

[0004] The utility model provides a pole piece production device, comprising:

[0005] Unwinding mechanism;

[0006] A reeling mechanism, used in conjunction with the unreeling mechanism to transport the pole piece; and

[0007] The online moisture detection mechanism is arranged between the unwinding mechanism and the rewinding mechanism, and is used to detect the moisture content of the electrode between the unwinding mechanism and the rewinding mechanism.

[0008] In one embodiment, it further comprises a drying mechanism, which is disposed between the unwinding mechanism and the online moisture detection mechanism and is used to dry the electrode between the unwinding mechanism and the online moisture detection mechanism; or

[0009] It also includes a coating mechanism, which is arranged between the unwinding mechanism and the online moisture detection mechanism and is used to form a coating layer on the substrate of the electrode.

[0010] In one embodiment, it also includes a drying mechanism and a coating mechanism. The drying mechanism is arranged between the unwinding mechanism and the online moisture detection mechanism, and is used to dry the electrode sheet located between the unwinding mechanism and the online moisture detection mechanism. The coating mechanism is arranged between the unwinding mechanism and the drying mechanism, and is used to form a coating layer on the substrate of the electrode sheet.

[0011] In one embodiment, it further includes a frame, at least one of the coating mechanism and the drying mechanism is arranged on the frame, and the online moisture detection mechanism is arranged on the frame.

[0012] In one embodiment, the online moisture detection mechanism comprises an infrared sensor probe, and the infrared sensor probe is used to detect the moisture content of the electrode between the drying mechanism and the winding mechanism.

[0013] In one embodiment, the infrared sensor probe is located in the arrangement direction of the substrate and the coating layer of the pole piece, and is spaced apart from the pole piece.

[0014] In one embodiment, in the arrangement direction of the substrate and the coating layer of the pole piece, the distance between the infrared sensor probe and the pole piece is 100 mm-300 mm; and / or

[0015] The infrared sensor probe can form near-infrared light with a spot size of 50mm-70mm on the pole piece; and / or

[0016] The infrared sensor probe includes a laser light source, a filter and a detector. In the arrangement direction of the substrate and the coating layer of the pole piece, the detector and the pole piece are spaced apart. The filter is located between the detector and the pole piece and is located on the optical path of the laser light source. The near-infrared light emitted by the laser light source can first be reflected by the filter to the pole piece and then reflected by the pole piece through the filter to reach the detector.

[0017] In one embodiment, the infrared sensor probe can perform linear reciprocating motion in the width direction of the pole piece.

[0018] In one embodiment, the online moisture detection mechanism also includes a driving unit, a driving conversion unit and a host unit. The driving conversion unit is respectively connected to the driving unit and the infrared sensing probe, and the host unit is respectively connected to the driving unit and the infrared sensing probe. The host unit can drive the infrared sensing probe to perform linear reciprocating motion in the width direction of the pole piece through the driving unit and the driving conversion unit.

[0019] In one embodiment, the online moisture detection mechanism also includes a fixed bracket and a driving rod. In the width direction of the pole piece, the fixed bracket spans the pole piece, and the driving rod is movably arranged on the fixed bracket. The driving rod can make a linear reciprocating motion in the width direction of the pole piece, and the infrared sensor probe is arranged on the driving rod.

[0020] When the above-mentioned electrode production device is working, in the process of conveying the electrode in cooperation with the unwinding mechanism and the rewinding mechanism, the electrode is first tested for moisture content by the online moisture detection mechanism before reaching the rewinding mechanism. Therefore, the above-mentioned electrode production device can realize the online detection of the moisture content of the electrode, and there is no need to extract part of the electrode samples by random sampling and send them to the detection room, and then take out an appropriate amount of coating layer material from the electrode to detect the moisture content of the electrode. The detection process is simple, the detection result is accurate, time-saving, labor-saving, and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a pole piece production device according to an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 A partial side view of a pole piece production device shown;

[0023] Figure 3 yes Figure 1 The schematic diagram of the structure of the infrared sensor probe of the electrode production device is shown. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] like Figure 1 and Figure 2As shown, an electrode production device 10 provided by an embodiment of the utility model. The electrode production device 10 includes an unwinding mechanism 300, a rewinding mechanism 600 and an online moisture detection mechanism 700. The unwinding mechanism 300 and the rewinding mechanism 600 are used in conjunction to convey the electrode 20. The online moisture detection mechanism 700 is arranged between the unwinding mechanism 300 and the rewinding mechanism 600, and is used to detect the moisture content of the electrode 20 located between the unwinding mechanism 300 and the rewinding mechanism 600.

[0028] When the electrode production device 10 is working, in the process of the unwinding mechanism 300 and the winding mechanism 600 cooperating to transport the electrode 20, the electrode 20 is first tested for moisture content by the online moisture detection mechanism 700 before reaching the winding mechanism 600. Therefore, the electrode production device 10 can realize the online detection of the moisture content of the electrode 20, and there is no need to extract part of the electrode 20 samples by random sampling and send them to the detection room, and then take out a proper amount of coating layer material from the electrode 20 to detect the moisture content of the electrode 20. The detection process is simple, the detection result is accurate, time-saving, labor-saving, and efficient.

[0029] It should be noted that the pole piece 20 includes a substrate 20 a and a coating layer formed on the substrate 20 a. The online moisture detection mechanism 700 is used to detect the moisture content of the coating layer of the pole piece 20 located between the unwinding mechanism 300 and the winding mechanism 600.

[0030] In this embodiment, the electrode production device 10 further includes a drying mechanism 500. The drying mechanism 500 is disposed between the unwinding mechanism 300 and the online moisture detection mechanism 700, and is used to dry the electrode 20 located between the unwinding mechanism 300 and the online moisture detection mechanism 700. In this way, continuous production of the electrode 20 can be performed. It is understood that in other embodiments, the drying mechanism 500 can also be omitted, in which case the electrode 20 unwound by the unwinding mechanism 300 can be a pre-dried electrode 20. It is understood that in other embodiments, the drying mechanism 500 can also be omitted, in which case the electrode 20 can be dried by natural drying.

[0031] In the present embodiment, the electrode production device 10 further includes a coating mechanism 400. The coating mechanism 400 is disposed between the unwinding mechanism 300 and the drying mechanism 500, and is used to form a coating layer on the substrate 20a of the electrode 20. In this way, the unwinding mechanism 300 is used to unwind the substrate 20a of the electrode 20, and the winding mechanism 600 is used to wind up the electrode 20 including the substrate and the coating layer. The electrode production device 10 integrates coating, drying and moisture detection, and can perform continuous production of the electrode 20. It is understood that in other embodiments, the coating mechanism 400 can be omitted, and in this case, the unwinding mechanism 300 is used to unwind the electrode 20 to be dried. It is understood that in other embodiments, when the drying mechanism 500 is omitted, the coating mechanism 400 is disposed between the unwinding mechanism 300 and the online moisture detection mechanism 700. The coating layer formed by the coating mechanism 400 on the substrate 20 a of the electrode 20 can be naturally dried and then the moisture content can be detected by the online moisture detection mechanism 700 .

[0032] In this embodiment, the electrode production device 10 also includes a frame. At least one of the coating mechanism 400 and the drying mechanism 500 is arranged on the frame. The online moisture detection mechanism 700 is arranged on the frame. In this way, it is very convenient for the electrode production device 10 to integrate coating, drying and moisture detection. It can be understood that in other embodiments, the frame can also be omitted. In this case, the coating mechanism 400, the drying mechanism 500 and the online moisture detection mechanism 700 can be arranged between the unwinding mechanism 300 and the winding mechanism 600 at intervals along the conveying direction of the electrode 20.

[0033] In this embodiment, the online moisture detection mechanism 700 includes an infrared sensor probe 710. The infrared sensor probe 710 is used to detect the moisture content of the pole piece 20 located between the drying mechanism 500 and the winding mechanism 600. That is, in this embodiment, the online moisture detection mechanism 700 is an online infrared moisture detection mechanism. The infrared sensor probe 710 can emit infrared light to the coating layer of the pole piece 20. The water molecules in the coating layer can absorb part of the infrared light, and reflect the remaining infrared light back and be recovered by the infrared sensor probe 710. The infrared sensor probe 710 can judge the water content in the pole piece 20 according to the energy absorbed by the vibration and rotation of the hydrogen and oxygen bonds in the water molecules, through the energy difference of the emitted and recovered infrared wavelengths. The infrared sensor probe 710 can realize non-destructive, in-situ, real-time, and online accurate detection of the moisture content of the pole piece 20 after coating and drying, and solve the problems of low efficiency, large error, destructiveness and toxicity of traditional offline detection technology. It can be understood that in other embodiments, the online moisture detection mechanism 700 can also be a resistance online detection mechanism, a microwave online detection mechanism or a neutron online detection mechanism.

[0034] It should be noted that traditional offline detection technologies mainly include Karl Fischer water determination and weighing method. Karl Fischer water determination is a classic chemical titration method that can usually accurately determine the water content. Its titration reagents include pyridine, iodine, methanol, sulfur dioxide, etc. The basic principle of Karl Fischer water determination is: the process of iodine oxidizing sulfur dioxide into sulfur trioxide. Since this process requires the participation of water, the consumed iodine has a corresponding relationship with the water content. Therefore, the water content can be inferred from the iodine consumption at the titration end point.

[0035]

[0036] Principle of Karl Fischer water determination

[0037] The principle of the weighing method is: weigh an appropriate amount of sample and place it on a balance, then weigh it again after drying in an oven. The water loss can be inferred from the difference in mass between the two weighings, and the moisture content can be calculated. The Karl Fischer moisture determination method and the weighing method have the following disadvantages: (1) Both are offline detection methods, that is, an appropriate amount of coating layer needs to be taken out from the electrode, and the moisture content can be calculated after chemical reaction or drying. Since the measurement requires a cumbersome process, the moisture content of the electrode may change during the process, resulting in a difference between the result and the real-time moisture content of the electrode on the process line; (2) It is necessary to wait for the reaction or drying to end, which is time-consuming, labor-intensive, and inefficient. In addition, the measurement results may vary due to the measurement location being not fixed or the measurement personnel being different; (3) Both methods are destructive testing methods and require the destruction of part of the coated electrode; (4) The Karl Fischer method has high environmental requirements and generally requires a room temperature of 25°C; in addition, toxic reagents such as methanol, pyridine, and sulfur dioxide are harmful to the human body; (4) The weighing method will cause the residual organic solvent to evaporate together with the water, resulting in the residual solvent being defaulted to water, resulting in errors in the calculation results (the calculated moisture content is too high).

[0038] In this embodiment, the infrared sensor probe 710 is located in the arrangement direction of the substrate 20a and the coating layer of the pole piece 20, and is spaced apart from the pole piece 20. In this way, it is very convenient to quickly and accurately check the water content of the pole piece 20. It can be understood that in other embodiments, the infrared sensor probe 710 may not be located in the arrangement direction of the substrate 20a and the coating layer of the pole piece 20, as long as the infrared light emitted by the infrared sensor probe 710 can reach the pole piece and be reflected back to the infrared sensor probe 710.

[0039] In this embodiment, in the arrangement direction of the substrate 20a and the coating layer, the distance between the infrared sensor probe 710 and the pole piece 20 is 100 mm-300 mm, so that the infrared sensor probe 710 can detect the water content of the pole piece 20 quickly and accurately.

[0040] In this embodiment, the sampling interval of the infrared sensor probe 710 is less than 1 second, and the detection accuracy of the infrared sensor probe 710 is less than 0.1%. In this way, it is very convenient for the infrared sensor probe 710 to quickly and accurately detect the water content of the electrode 20.

[0041] In this embodiment, if Figure 3 As shown, the infrared sensor probe 710 includes a laser light source 712, which can form near-infrared light with a spot size of 50 mm-70 mm on the pole piece 20. In this way, the infrared sensor probe 710 can detect the water content of the pole piece 20 quickly and accurately.

[0042] In this embodiment, the infrared sensor probe 710 also includes a filter 714 and a detector 716. In the arrangement direction of the substrate 20a and the coating layer of the pole piece 20, the detector 716 is spaced apart from the pole piece 20. The filter 714 is located between the detector 716 and the pole piece 20, and is located on the optical path of the laser light source 712. The near-infrared light emitted by the laser light source 712 is first reflected by the filter 714 to the pole piece 20, and then reflected by the pole piece 20 through the filter 714 to reach the detector 716. In this way, it is very convenient for the infrared sensor probe 710 to quickly and accurately detect the water content of the pole piece 20.

[0043] Specifically, in this embodiment, the laser light source 712 can emit near-infrared light with a spot size of 60 mm. The near-infrared light beam is reflected to the surface of the pole piece 20 by the filter 714. The hydrogen-oxygen bond (HO bond) of the water molecules in the pole piece 20 absorbs energy of a specific wavelength due to vibration and rotation, so the energy at the wavelength is reduced. After the wavelength is reflected back, it is detected by the detector 716. After processing, the moisture content can be obtained. Specifically, the laser light source 712 emits infrared light with an intensity of 100%. If the water content of the pole piece 20 is 1%, the OH bond in the 1% water molecules absorbs 2% of the infrared light at 1940nm, so the detector 716 receives 98% of the infrared light intensity; and when the water content of the pole piece 20 is 5%, the 5% water molecules absorb 10% of the infrared light at 1940nm, so the detector 716 detects the remaining 90% of the intensity of the infrared light. Therefore, according to the infrared light intensity received by the infrared sensor probe 710, the water content of the pole piece 20 can be inferred. If 94% of the intensity of infrared light is received, the water content is 3%.

[0044] In this embodiment, if Figure 1 and Figure 2As shown, the infrared sensor probe 710 can make a straight reciprocating motion in the width direction of the pole piece 20. That is, in the present embodiment, in the conveying direction of the pole piece 20, the motion trajectory of the infrared sensor probe 710 is a horizontal straight line. In this way, it is possible to detect the moisture content at different positions in the pole piece 20 while coating, thereby ensuring the flexibility of the online moisture detection mechanism 700 and the reliability of the data results. It is understood that in other embodiments, in the conveying direction of the pole piece 20, the motion trajectory of the infrared sensor probe 710 may also be a horizontal S-shape or W-shape. In other embodiments, the motion trajectory of the infrared sensor probe 710 may also be fixed.

[0045] In this embodiment, the online moisture detection mechanism 700 further includes a driving unit 720 and a driving conversion unit 730. The driving conversion unit 730 is connected to the driving unit 720 and the infrared sensor probe 710 respectively. The driving unit 720 drives the infrared sensor probe 710 to perform a linear reciprocating motion in the width direction of the pole piece 20 through the driving conversion unit 730. In this way, it is very convenient to realize that the infrared sensor probe 710 performs a linear reciprocating motion in the width direction of the pole piece 20.

[0046] In this embodiment, the main function of the driving unit 720 is to convert electrical energy into mechanical energy, and drive the infrared sensor probe 710 to perform a linear reciprocating motion in the width direction of the pole piece 20 through the driving conversion unit 730. Specifically, in this embodiment, the driving unit 720 can be a linear motor. In practical applications, the speed of the linear motor can be selected according to the conveying speed of the pole piece 20. Specifically, in this embodiment, the speed range of the linear motor is 80-3000r / min, the output power is 15-100W, and the maximum torque is 68N·m.

[0047] In this embodiment, the drive conversion unit 730 is used to convert the rotational motion of the drive unit 720 into a linear reciprocating motion, and adjust the speed and other parameters of the linear reciprocating motion according to the output power, rotation speed and other parameters of the drive unit 720. The drive conversion unit 730 can be a crank slider mechanism, an eccentric wheel mechanism, a grooved wheel mechanism or a cam mechanism.

[0048] In this embodiment, the online moisture detection mechanism 700 further includes a host unit 740. The host unit 740 is connected to the drive unit 720 and the infrared sensor probe 710 respectively. The host unit 740 can drive the infrared sensor probe 710 to perform a straight line reciprocating motion in the width direction of the pole piece 20 through the drive unit 720 and the drive conversion unit 730. In this way, it is very convenient to realize the intelligentization of moisture detection.

[0049] In this embodiment, the host unit 740 has two main functions: first, adjusting the parameters of the drive unit 720 and the drive conversion unit 730 according to the movement speed of the pole piece 20, the coating width and other conditions, so that the movement speed of the infrared sensor probe 710 along the width direction of the pole piece 20 is roughly equal to the speed of conveying the pole piece 20 along the conveying direction of the pole piece 20; second, performing baseline correction, data processing, output and storage on the data detected by the infrared sensor probe 710. Specifically, in this embodiment, the host unit 740 is a computer host.

[0050] In this embodiment, the online moisture detection mechanism 700 further includes a fixed bracket 750 and a driving rod 760. In the width direction of the pole piece 20, the fixed bracket 750 spans the pole piece 20. The driving rod 760 is movably arranged on the fixed bracket 750. The driving rod 760 can make a straight line reciprocating motion in the width direction of the pole piece 20. The infrared sensor probe 710 is arranged on the driving rod 760. In this way, it is very convenient to realize that the infrared sensor probe 710 makes a straight line reciprocating motion in the width direction of the pole piece 20.

[0051] In order to more intuitively and clearly highlight the technical solutions and advantages of the present invention, the present invention is further described in detail below through specific embodiments.

[0052] The linear motor used in the embodiment has a speed range of 80-3000r / min, an output power of 15-100W, and a maximum torque of 68N·m. The drive conversion unit 730 uses a guide rail, a slider and a corresponding controller. The guide rail is made of wear-resistant aluminum alloy and is responsible for supporting and guiding the movement of the slider. The slider is made of alloy steel, and the surface is coated with wear-resistant and corrosion-resistant coatings to extend its service life. In the embodiment, the infrared sensor probe 710 has a height of 400mm, a length of 224mm, and a width of 160mm. The lower end of the infrared sensor probe 710 is 200mm away from the pole piece. The infrared sensor probe 710 is connected to the fixed bracket 750 through a drive rod 760, and the fixed bracket 750 is fixed to the frame by M12 screws. The specific embodiment parameters are shown in Table 1.

[0053] Table 1 Parameters of infrared sensor probe

[0054]

[0055] In the embodiment, the electrode is coated, dried and moisture tested. The process parameters such as slurry, viscosity, roll diameter, coating speed, etc. related to the embodiment are shown in Table 2.

[0056] Table 2 Parameters of coating process

[0057]

[0058] The results of the detected electrode moisture content were collected, and the data of 50 continuous monitoring points were randomly selected, as shown in Table 3.

[0059] Table 3 Moisture content test data of any 50 consecutive points (unit: %)

[0060]

[0061] As shown in Table 3, the electrode production device of the utility model has good performance in detecting moisture content of the electrode in the coating section, and the moisture content of 50 consecutive points is within the range of 0.58-0.60%, with a fluctuation of no more than 0.03%. The results show that the electrode production device of the utility model has excellent performance and can fully achieve the predetermined goal.

[0062] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A pole piece production device, characterized in that: include: Unwinding mechanism; A winding mechanism, used in conjunction with the unwinding mechanism to convey the electrode; as well as The online moisture detection mechanism is arranged between the unwinding mechanism and the rewinding mechanism, and is used to detect the moisture content of the electrode between the unwinding mechanism and the rewinding mechanism.

2. The electrode production device according to claim 1, characterized in that: It also includes a drying mechanism, which is arranged between the unwinding mechanism and the online moisture detection mechanism and is used to dry the electrode between the unwinding mechanism and the online moisture detection mechanism; or It also includes a coating mechanism, which is arranged between the unwinding mechanism and the online moisture detection mechanism and is used to form a coating layer on the substrate of the electrode.

3. The electrode production device according to claim 1, characterized in that: It also includes a drying mechanism and a coating mechanism. The drying mechanism is arranged between the unwinding mechanism and the online moisture detection mechanism, and is used to dry the electrode sheet between the unwinding mechanism and the online moisture detection mechanism. The coating mechanism is arranged between the unwinding mechanism and the drying mechanism, and is used to form a coating layer on the substrate of the electrode sheet.

4. The electrode production device according to claim 3, characterized in that: It also includes a frame, at least one of the coating mechanism and the drying mechanism is arranged on the frame, and the online moisture detection mechanism is arranged on the frame.

5. The electrode production device according to claim 1, characterized in that: The online moisture detection mechanism comprises an infrared sensor probe, and the infrared sensor probe is used to detect the moisture content of the pole piece located between the unwinding mechanism and the winding mechanism.

6. The electrode production device according to claim 5, characterized in that: The infrared sensor probe is located in the arrangement direction of the substrate and the coating layer of the pole piece, and is spaced apart from the pole piece.

7. The electrode production device according to claim 6, characterized in that: In the arrangement direction of the substrate and the coating layer of the pole piece, the distance between the infrared sensor probe and the pole piece is 100mm-300mm; and / or The infrared sensor probe can form near-infrared light with a spot size of 50mm-70mm on the pole piece; and / or The infrared sensor probe includes a laser light source, a filter and a detector. In the arrangement direction of the substrate and the coating layer of the pole piece, the detector and the pole piece are spaced apart. The filter is located between the detector and the pole piece and is located on the optical path of the laser light source. The near-infrared light emitted by the laser light source can first be reflected by the filter to the pole piece and then reflected by the pole piece through the filter to reach the detector.

8. The electrode production device according to claim 5, characterized in that: The infrared sensor probe can perform linear reciprocating motion in the width direction of the pole piece.

9. The electrode production device according to claim 8, characterized in that: The online moisture detection mechanism also includes a driving unit, a driving conversion unit and a host unit. The driving conversion unit is respectively connected to the driving unit and the infrared sensing probe, and the host unit is respectively connected to the driving unit and the infrared sensing probe. The host unit can drive the infrared sensing probe to perform linear reciprocating motion in the width direction of the pole piece through the driving unit and the driving conversion unit.

10. The electrode production device according to claim 8, characterized in that: The online moisture detection mechanism also includes a fixed bracket and a driving rod. In the width direction of the pole piece, the fixed bracket spans the pole piece, and the driving rod is movably arranged on the fixed bracket. The driving rod can perform linear reciprocating motion in the width direction of the pole piece, and the infrared sensor probe is arranged on the driving rod.

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