Full-automatic splicer cleaning device

Abstract

The utility model belongs to the technical field of textile machinery, and discloses a full-automatic splicer cleaning device which comprises a cleaning device body, and the cleaning device body comprises a disassembly and assembly mechanical arm, a cleaning mechanical arm and an oiling mechanical arm which are arranged in sequence. The disassembling and assembling mechanical arm is used for disassembling and assembling the splicer; the cleaning mechanical arm is used for cleaning the splicer; the oiling mechanical arm is used for oiling a bearing of the splicer; a propelling assembly used for transferring the splicer is further arranged in the cleaning device body and comprises a gear track and a propelling platform, the gear track is arranged on a shell of the device body, the propelling platform is arranged on the shell in a sliding mode, a propelling motor is arranged on the propelling platform, the output end of the propelling motor is connected with a gear, and the gear is meshed with the gear track. The splicer is arranged on the propelling platform; according to the scheme, by arranging the disassembling and assembling mechanical arm, the cleaning mechanical arm and the refueling mechanical arm, the disassembling, cleaning and refueling processes of the splicer are automatically completed; according to the automatic cleaning device, the splicer can be automatically cleaned.

Description

Technical Field

[0001] This solution belongs to the field of textile machinery technology, specifically involving a fully automatic cleaning splicer device. Background Technology

[0002] Splicers are key pieces of equipment in the textile industry, primarily used for knot-free yarn splicing. They twist the ends of two yarns together physically or pneumatically to form a smooth, high-strength connection, thus replacing traditional knotting methods. Splicers are widely used in textile equipment such as winding machines and doubling machines, and their performance directly affects the reliability of yarn splices and the continuity of the weaving process. However, in the high-dust, high-humidity, and high-fiber-flying environment of textile workshops, splicers easily accumulate fiber debris, oil, dust, and other impurities after long-term operation, leading to the following problems:

[0003] Contaminants can penetrate the core components of the splicer (such as the splicing chamber, pneumatic nozzle, and clamping mechanism), interfering with the precise positioning and splicing of the yarn, and even causing problems such as yarn breakage and machine shutdown. Secondly, accumulated dirt can accelerate mechanical wear and shorten the equipment's lifespan. Traditional manual cleaning methods rely on periodic shutdowns for disassembly and cleaning, which is difficult to meet the needs of continuous operation in modern textile production.

[0004] See the existing publication (announcement) document CN101466882A, which discloses a cleaning device for splicing apparatus, including a suction section disposed adjacent to a splicing nozzle that places the yarn in a compressed fluid flow for splicing, and covered by a cover. By being covered by the cover, at least when splicing is performed by the splicing nozzle, a closed space is formed in which the splicing nozzle and the suction section are disposed.

[0005] The aforementioned cleaning device removes fibrous dust generated during splicing by using a suction unit. However, its cleaning function is limited to passively adsorbing fibrous dust generated by compressed fluid during the splicing process; it cannot automatically disassemble, clean, or install the splicer. Utility Model Content

[0006] The purpose of this solution is to provide a fully automatic splicer cleaning device to automatically clean splicers.

[0007] To achieve the above objectives, this solution provides a fully automatic cleaning splicer device, including a cleaning device body, which includes a disassembly / assembly robotic arm, a cleaning robotic arm, and a lubrication robotic arm arranged sequentially; the disassembly / assembly robotic arm is used to disassemble and install the splicer; the cleaning robotic arm is used to clean the splicer; and the lubrication robotic arm is used to lubricate the bearings of the splicer.

[0008] The principle and effect of this solution are as follows: by setting up a disassembly and assembly robotic arm, a cleaning robotic arm, and a lubrication robotic arm, the disassembly, cleaning, and lubrication processes of the splicer can be completed automatically.

[0009] Furthermore, the cleaning device body is also provided with a propulsion assembly for transporting the splicer. The propulsion assembly includes a gear track and a propulsion platform. The gear track is located on the outer shell of the device body, and the propulsion platform is slidably located on the outer shell. The propulsion platform is provided with a propulsion motor, and the output end of the propulsion motor is connected to a gear. The gear meshes with the gear track. The splicer is located on the propulsion platform.

[0010] The principle and effect of this solution are as follows: by driving the gear to rotate through the propulsion motor, the propulsion platform is moved, thereby transferring the splicer to the disassembly and assembly robotic arm, the cleaning robotic arm and the refueling robotic arm in sequence. Finally, the propulsion platform is reset to the position of the disassembly robotic arm by reversing the propulsion motor, and the splicer is reinstalled.

[0011] Furthermore, it also includes an oil storage tank and a drive assembly disposed within the oil storage tank. The oil storage tank is connected to an oil delivery pipe, and the oil outlet end of the oil delivery pipe is disposed on the refueling robotic arm. A piston is slidably disposed within the oil storage tank, and the drive assembly is used to drive the piston to move.

[0012] The principle and effect of this scheme are as follows: (1) An oil storage tank is set up to store the machine oil sprayed on the bearing of the splicer. The piston is driven by the drive assembly to move towards the outlet end of the oil storage tank, thereby squeezing the chamber in the oil storage tank used to store the machine oil. Then the machine oil is transported through the oil delivery pipe. The oil delivery pipe is moved by the refueling robot arm, so that the machine oil sprayed from the oil outlet end is sprayed onto the bearing of the splicer. (2) After the machine oil is sprayed on the oil delivery pipe, since there is a distance between the next splicer and the current splicer, the oil delivery needs to be stopped. The machine oil has inertia in the flow of the oil delivery pipe, which will cause the machine oil to continue to flow for a short distance, making the machine oil easy to adhere to the pipe opening and form droplets. At the same time, after the equipment is stopped, in order to avoid the machine oil remaining in the oil delivery pipe from solidifying due to temperature changes, it is also necessary to recover the machine oil in the pipe to avoid pipe blockage. After spraying oil onto a single splicer, this solution uses a drive assembly to reset the piston, thereby creating negative pressure in the oil reservoir. This firstly prevents the oil from continuing to flow to the outlet, and more importantly, it allows the oil in the pipeline to be recovered after the equipment is shut down.

[0013] Furthermore, the drive assembly includes a cylinder, and the piston rod of the cylinder is fixedly connected to the piston.

[0014] The principle and effect of this scheme are as follows: (1) The piston in the oil tank is driven by the extension movement of the cylinder piston rod, thereby squeezing the oil; and the oil tank is made to generate negative pressure by the retraction of the piston, and the oil in the oil delivery pipe is recovered. (2) The structure is simple and easy to maintain because it is driven by the cylinder.

[0015] Furthermore, the drive assembly includes an electromagnet and a permanent magnet. The permanent magnet is disposed inside the piston, and the electromagnet is disposed at the bottom of the oil storage tank. When the electromagnet is energized, it repels the permanent magnet.

[0016] The principle and effect of this scheme are as follows: the electromagnet is energized and repulses the permanent magnet, thereby driving the piston to move.

[0017] Furthermore, the piston is connected to a return spring, and the free end of the return spring is fixedly connected to the oil storage tank.

[0018] The principle and effect of this solution are as follows: While a cylinder-driven piston can squeeze and recover oil during normal equipment shutdown or shutdown, in the event of an abnormal shutdown, the piston rod stops moving because the air pump connected to the cylinder ceases operation. This causes the piston in the oil storage tank to lose external force, preventing the recovery of oil from the delivery pipe during abnormal shutdowns. In this solution, during normal equipment operation, the electromagnet is energized, driving the piston to squeeze the oil and stretching the return spring, generating preload. When the equipment stops, especially after a power outage, the permanent magnet loses the repulsive force of the electromagnet and resets under the action of the return spring, creating negative pressure in the oil storage tank and recovering the oil from the delivery pipe into the storage tank.

[0019] Furthermore, it also includes a conductive component installed inside the oil storage tank. The conductive component includes a conductive rod and a discharge needle. The conductive rod is fixed inside the oil storage tank and is connected to a negative power source via a wire. The discharge needle is located on the conductive rod. The bearing of the splicer carries a positive charge.

[0020] The principle and effect of this solution are as follows: Since the bearing of the splicer is disassembled and placed on the propulsion platform, when spraying oil onto the bearing through the oil delivery pipe, it is necessary to spray oil onto the front of the bearing, but it is difficult to cover the back of the bearing at the same time. This solution involves setting a conductive rod and a discharge needle inside the oil tank. After the negative power supply is connected to the conductive rod, the discharge needle injects a negative charge into the oil, resulting in negatively charged oil (the principle of charging can be found in CN110831307B). Since the bearing carries a positive charge, when the oil is sprayed through the oil delivery pipe, an electric field attraction is formed between the positive and negative charges. This drives the negatively charged oil not only to cover the front of the bearing, but also to flow around to the back of the bearing under the action of the electric field, making the oil spray more uniform and reducing grease splashing loss.

[0021] Furthermore, the discharge needles are arranged in a circular pattern along the central axis of the conductive rod, and the discharge needles are arranged in a spiral pattern along the length of the conductive rod.

[0022] The principle and effect of this scheme are: to optimize the charge distribution and oil charge rate by using a spiral array of discharge needles.

[0023] Furthermore, one end of the conductive rod is rotatably connected to the piston, the outer wall of the conductive rod is provided with a guide groove, and the oil storage tank is provided with a pin, which is configured to cooperate with the guide groove.

[0024] The principle and effect of this solution are as follows: Since engine oil is prone to stratification and sedimentation when left to stand, it needs to be periodically stirred to prevent sedimentation. In this solution, as the piston in the oil reservoir moves up and down, it drives the conductive rod to move up and down synchronously. This causes the guide groove on the conductive rod to engage with the pin, converting the lateral movement of the conductive rod into rotation. This allows the discharge needle on the conductive rod to stir the engine oil, preventing sedimentation and increasing the oil's charge carrying capacity.

[0025] Furthermore, the refueling robotic arm is equipped with a protective cover for protecting the sensing elements, and the protective cover carries a negative charge.

[0026] The principle and effect of this solution are as follows: Typical robotic arms are equipped with sensing elements, such as infrared sensors. Therefore, when the robotic arm pulls the oil delivery pipe to spray oil, oil vapor molecules will splash onto these components. Thus, a protective cover is installed to protect these components. However, to prevent oil from splashing onto the protective cover itself, it is designed to carry a negative charge, causing the sprayed oil to repel the cover and making it less likely to splash onto it. Attached Figure Description

[0027] Figure 1 This is a front view of the overall structure of a fully automatic cleaning splicer device according to this utility model;

[0028] Figure 2 This is a top view of the overall structure of a fully automatic cleaning splicer device according to this utility model;

[0029] Figure 3 This is a side view of the overall structure of a fully automatic cleaning splicer device according to this utility model;

[0030] Figure 4 This is a schematic diagram of the internal structure of the oil storage tank of this utility model;

[0031] Figure 5 This is a schematic diagram of the guide groove and pin of this utility model.

[0032] The reference numerals in the accompanying drawings include: housing 101, transparent window 102, splicer 103, splicer screw 104, bearing 105, propulsion platform 106, splicer rotary motor 107, gear rotary motor 108, gear rotary shaft 109, gear slider 110, gear track 111, gear 112, first disassembly / assembly robotic arm 201, second disassembly / assembly robotic arm 204, first cleaning robotic arm 202, second cleaning robotic arm 205, first refueling robotic arm 203, and second refueling robotic arm 206.

[0033] Oil storage tank 3, oil delivery pipe 31, piston 32, drive assembly 4, electromagnet 41, permanent magnet 42, return spring 43, pin 44, conductive assembly 5, conductive rod 51, guide groove 511, discharge needle 52. Detailed Implementation

[0034] The following will describe the concept and technical effects of this utility model clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model.

[0035] Example 1:

[0036] Please see Figures 1-3 The splicer 10 provided in this embodiment includes a splicer screw 104, a bearing 105 and a splicer rotary motor 107. The output shaft of the splicer rotary motor 107 is fixedly connected to the bearing. The splicer rotary motor 107 drives the bearing 105 to rotate, which facilitates lubrication when cleaning the robotic arm and adding oil.

[0037] A fully automatic cleaning splicer device includes a cleaning device body, which includes a frame and a housing 101 mounted on the frame. The housing 101 has a transparent window 102. The frame is equipped with a disassembly / assembly robotic arm, a cleaning robotic arm, and a refueling robotic arm connected sequentially from left to right. The cleaning device body also includes a propulsion assembly for transporting the splicer 103. The propulsion assembly includes a gear track 111 and a propulsion platform 106. The gear track 111 is mounted on the housing 101 of the device body and on the frame, and is arranged along the direction of the three sets of robotic arms. The propulsion platform 106 is slidably mounted on the housing 101. The propulsion platform 106 is equipped with a propulsion motor 108, and the output end of the propulsion motor 108 is connected to a gear 112, which meshes with the gear track 111. The splicer 103 is mounted on the propulsion platform 106. The drive motor 108 drives the gear 112 to rotate, which in turn drives the drive platform 106 to move, thereby transferring the splicer 103 to the disassembly and assembly robotic arm, the cleaning robotic arm, and the refueling robotic arm in sequence. Finally, the drive motor 108 reverses to drive the drive platform 106 to reset to the position of the disassembly robotic arm, and the splicer 103 is reinstalled, completing the entire process.

[0038] The disassembly and assembly robotic arm includes a first disassembly and assembly robotic arm 201 and a second disassembly and assembly robotic arm 204 arranged symmetrically, and the disassembly and assembly robotic arm is used to disassemble and install the splicer 103; the cleaning robotic arm includes a first cleaning robotic arm 202 and a second cleaning robotic arm 205 arranged symmetrically, and the cleaning robotic arm is used to clean the splicer 103; the lubrication robotic arm includes a first lubrication robotic arm 203 and a second lubrication robotic arm 206 arranged symmetrically, and the lubrication robotic arm is used to lubricate the bearing 105 of the splicer 103.

[0039] It should be noted that the first disassembly / assembly robotic arm 201, the second disassembly / assembly robotic arm 204, the first cleaning robotic arm 202, the second cleaning robotic arm 205, the first refueling robotic arm 203, and the second refueling robotic arm 206 are all existing technologies. Those skilled in the art can use any existing robotic arm to achieve the above functions. For example, the disassembly / assembly robotic arm uses the CN201821292349.7 automated robotic gripper from Foshan Guanbo Machinery Technology Co., Ltd. This gripper uses a high-torque, low-speed motor to drive an arc-shaped gripping plate, supporting multi-angle flipping and precise gripping, and can be adapted to splice components of different shapes (such as pneumatic nozzles and gripping mechanisms). The disassembly / assembly robotic arm is paired with the Huacheng Industrial Control EC-C5 stamping robotic arm control system, supporting multi-axis linkage and I / O port expansion (such as the Y10-Y47 output ports controlling the timing of gripping actions). The cleaning robotic arm integrates its main drive unit with multi-mode cleaning components, combining a high-pressure airflow nozzle, an ultrasonic vibration module, and a rotating brush (custom design required). This allows for switching between different cleaning modes (e.g., high-pressure blowing of fiber debris, ultrasonic dissolution of oil stains). The controller is a Shenzhen Weiteer single-axis robotic arm controller, equipped with a 3.5-inch TFT LCD screen and a modular PCB design, supporting the storage of multiple cleaning programs (e.g., parameter matching for different levels of contamination). It dynamically adjusts the cleaning frequency and intensity by monitoring sensor feedback (e.g., contamination detection signals) via I / O ports. The lubrication robotic arm uses a Haopu Electromechanical metering pump lubrication system (compatible with the robotic arm structure), integrating a multi-point lubrication mechanism and anti-contamination design (e.g., sealed lubrication needles). It can control the grease output (0.1mL accuracy) to prevent excessive lubrication from affecting yarn quality. Its controller, combined with the Huacheng Industrial Control EC-C4 control system, outputs pulse signals via the Y-port to control the metering pump's operation.

[0040] Example 2:

[0041] Please see Figure 4 The difference between this embodiment and the previous embodiment is that:

[0042] The cleaning device also includes an oil storage tank 3 for storing oil sprayed onto the bearings of the splicer. The oil storage tank 3 contains a drive assembly 4 and is connected to an oil delivery pipe 31. The oil outlet of the oil delivery pipe 31 is mounted on a refueling robotic arm. The refueling robotic arm drives the traction oil delivery pipe 31 to move, thereby spraying the oil from the outlet onto the bearings 1.5 of the splicer 1.3. A piston 32 is slidably mounted inside the oil storage tank 3. The drive assembly 4 drives the piston 32 to move up and down within the oil storage tank 3. The drive assembly 4 drives the piston 32 towards the outlet of the oil storage tank 3, thereby squeezing the chamber within the oil storage tank 3 used for storing oil. This allows the oil to be transported through the oil delivery pipe 31, and the refueling robotic arm drives the traction oil delivery pipe 31 to move, thus spraying the oil from the outlet onto the bearings 105 of the splicer 103. Meanwhile, after spraying oil onto a single splicer 103, the piston 32 is reset by the drive assembly 4, thereby creating negative pressure in the oil tank 3. This firstly prevents the oil from continuing to flow to the outlet, and more importantly, it allows the oil in the pipeline to be recovered after the equipment stops.

[0043] The drive assembly 4 uses a cylinder. The piston rod of the cylinder is fixedly connected to the piston 32 of the oil storage tank 3. The extension and retraction of the piston rod of the cylinder drives the piston 32 to move, thereby realizing oil squeezing and oil return.

[0044] The drive assembly 4 preferably includes an electromagnet 41 and a permanent magnet 42. The permanent magnet 42 is located inside the piston 32, and the electromagnet 41 is located at the bottom of the oil storage tank 3. When the electromagnet 41 is energized, it repels the permanent magnet 42. The piston 32 is connected to a return spring 43, and the free end of the return spring 43 is fixedly connected to the oil storage tank 3. When the equipment is working normally, the electromagnet 41 is energized and repels the permanent magnet 42, thereby driving the piston 32 to squeeze the oil and stretch the return spring 43, generating a preload. When the equipment stops, especially after a power outage, the permanent magnet 42 loses the repulsive force of the electromagnet 41 and resets under the action of the return spring 43, thereby creating a negative pressure in the oil storage tank 3 and recovering the oil from the oil delivery pipe 31 into the oil storage tank 3.

[0045] Please see Figure 4 and Figure 5It also includes a conductive component 5 installed in the oil storage tank 3. The conductive component 5 includes a conductive rod 51 and a discharge needle 52. The conductive rod 51 is fixedly installed in the oil storage tank 3. The conductive rod 51 is connected to a negative power source through a wire. The discharge needle 52 is installed on the conductive rod 51 (the specific structure and oil charging principle can be referred to in the existing patent CN110831307B). The discharge needle 52 is arranged in a circular pattern along the central axis of the conductive rod 51 and in a spiral pattern along the length of the conductive rod 51 to optimize the charge distribution and the oil charging rate. The bearing of the splicer 103 can be charged by the momentary contact between the pre-set conductive contact and the positive power source: when the bearing 105 is transferred to the propulsion platform 106 by the disassembly and assembly robot arm, the elastic conductive probe (connected to the positive power source) built into the platform contacts the surface of the bearing 105. By briefly energizing, the metal bearing 105 becomes positively charged due to electron migration. It should be noted that, to prevent leakage discharge from the oil storage tank and other related equipment, those skilled in the art can perform insulation treatment on the remaining device structure. The refueling robotic arm is equipped with a protective cover (not shown in the figure) to protect the sensing element. The specific location of the cover is the location of the sensing element. A transparent protective cover is wrapped around the sensing element, and the protective cover carries a negative charge.

[0046] Specific working principle: By setting a conductive rod 51 and a discharge needle 52 inside the oil storage tank 3, after the negative power supply is connected to the conductive rod 51, the discharge needle 52 injects a negative charge into the oil, resulting in negatively charged engine oil. Since the bearing 105 carries a positive charge, when the engine oil is sprayed through the oil delivery pipe 31, an electric field attraction is formed between the positive and negative charges. This drives the negatively charged engine oil not only to cover the front of the bearing 105, but also to flow around to the back of the bearing 105 under the action of the electric field, making the engine oil spray more uniform and reducing grease splashing loss. At the same time, since the protective cover is a negatively charged protective cover, the sprayed engine oil repels the protective cover, making it less likely to splash onto the protective cover.

[0047] Please continue reading. Figure 4 and Figure 5 To prevent the engine oil from easily separating and settling when stationary, one end of the conductive rod 51 in this embodiment is rotatably connected to the piston 32, and a guide groove 511 is provided on the outer wall of the free end of the conductive rod 51. A pin 44 is provided inside the oil reservoir 3, and the pin 44 is configured to cooperate with the guide groove 511. It should be noted that the guide groove 511 can refer to the guide groove 511 of a cylindrical cam structure (see...). Figure 5 This allows the conductive rod 51 to convert its vertical and horizontal movements into rotation, thereby enabling the discharge needle on the conductive rod to agitate the oil, prevent oil sedimentation, and increase the oil's charge carrying capacity.

[0048] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A fully automatic cleaning splicer device, comprising a cleaning device body, characterized in that, The cleaning device body includes a disassembly and assembly robotic arm (201, 204), a cleaning robotic arm (202, 205), and an oiling robotic arm (203, 206) arranged in sequence; the disassembly and assembly robotic arm (201, 204) is used to disassemble and install the splicer (103); the cleaning robotic arm (202, 205) is used to clean the splicer (103); and the oiling robotic arm (203, 206) is used to lubricate the bearings of the splicer (103).

2. The fully automatic cleaning splicer device according to claim 1, characterized in that: The cleaning device body is also provided with a propulsion assembly for transferring the splicer (103). The propulsion assembly includes a gear track (111) and a propulsion platform (106). The gear track (111) is located on the outer shell (101) of the device body. The propulsion platform (106) is slidably located on the outer shell (101). The propulsion platform (106) is provided with a propulsion motor (108). The output end of the propulsion motor (108) is connected to a gear (112). The gear (112) meshes with the gear track (111). The splicer (103) is located on the propulsion platform (106).

3. The fully automatic cleaning splicer device according to claim 1, characterized in that: It also includes an oil storage tank (3) and a drive assembly (4) disposed in the oil storage tank (3). The oil storage tank (3) is connected to an oil delivery pipe (31), and the oil outlet end of the oil delivery pipe (31) is disposed on the refueling robotic arm (203, 206). A piston (32) is slidably disposed in the oil storage tank (3), and the drive assembly (4) is used to drive the piston (32) to move.

4. The fully automatic cleaning splicer device according to claim 3, characterized in that: The drive assembly (4) includes a cylinder, the piston rod of which is fixedly connected to the piston (32).

5. The fully automatic cleaning splicer device according to claim 3, characterized in that: The drive assembly (4) includes an electromagnet (41) and a permanent magnet (42). The permanent magnet (42) is located inside the piston (32), and the electromagnet (41) is located at the bottom of the oil storage tank (3). When the electromagnet (41) is energized, it repels the permanent magnet (42).

6. The fully automatic cleaning splicer device according to claim 5, characterized in that: The piston (32) is connected to a return spring (43), and the free end of the return spring (43) is fixedly connected to the oil storage tank (3).

7. The fully automatic cleaning splicer device according to claim 6, characterized in that: It also includes a conductive component (5) installed in the oil storage tank (3). The conductive component (5) includes a conductive rod (51) and a discharge needle (52). The conductive rod (51) is fixedly installed in the oil storage tank (3). The conductive rod (51) is connected to a negative power source through a wire. The discharge needle (52) is installed on the conductive rod (51). The bearing of the splicer (103) carries a positive charge.

8. The fully automatic cleaning splicer device according to claim 7, characterized in that: The discharge needles (52) are arranged in a circular pattern along the central axis of the conductive rod (51), and the discharge needles (52) are arranged in a spiral pattern along the length of the conductive rod (51).

9. The fully automatic cleaning splicer device according to claim 7, characterized in that: One end of the conductive rod (51) is rotatably connected to the piston (32). The outer wall of the conductive rod (51) is provided with a guide groove (511). The oil storage tank (3) is provided with a pin (44). The pin (44) is configured to cooperate with the guide groove (511).

10. The fully automatic cleaning splicer device according to claim 7, characterized in that: The refueling robotic arm (203, 206) is equipped with a protective cover for protecting the sensing elements, and the protective cover carries a negative charge.

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