An apparatus for measuring the water-to-ash ratio of petroleum coke

Abstract

The present invention discloses a petroleum coke water-to-ash ratio measuring instrument, which relates to the field of water-to-ash ratio measurement. The following scheme is now proposed, which includes: a bracket; an adjusting frame rotatably connected to the bracket, a plurality of sample racks are evenly rotatably arranged on the outer surface of the adjusting frame, and a sample cup for accommodating samples is slidably connected to the sample rack; a fixed cylinder fixed on the bracket, a first transmission shaft is fixed on the outer surface of the sample rack, and the first transmission shaft is intermittently engaged with the fixed cylinder; a transmission ratchet coaxial with the adjusting frame and the bracket, used to drive the adjusting frame to rotate; a resistance measurement probe slidably connected to the bracket, used to measure the resistance of the sample; a transmission member assembled on the bracket, the resistance measurement probe is linked to the transmission ratchet through the transmission member, and is used to drive the adjusting frame to change positions when the resistance measurement probe moves up and down; a crusher fixed on the bracket, used to crush the sample. By automatically switching the measurement process, the measurement efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of water - ash ratio determination, and particularly to an apparatus for determining the water - ash ratio of petroleum coke. Background Art

[0002] Petroleum coke, abbreviated as petroleum coke, is a product obtained by separating heavy and light oils through distillation of crude oil and then subjecting the heavy oil to thermal cracking.

[0003] Qualified petroleum coke can be used as fuel. To determine whether petroleum coke is qualified, it is mainly necessary to detect its water - ash ratio, that is, the ratio of moisture and ash. Currently, the detection methods mainly include combustion detection and resistivity detection methods. No matter which detection method is used, multiple devices are required to cooperate for detection, and the operation is troublesome. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an apparatus for determining the water - ash ratio of petroleum coke to achieve automatic switching of the determination process and improve the determination efficiency.

[0005] To achieve the above - mentioned technical object, the present invention provides an apparatus for determining the water - ash ratio of petroleum coke:

[0006] It includes: a bracket; an adjusting frame rotatably connected to the bracket. A plurality of sample holders are evenly rotatably arranged on the outer surface of the adjusting frame. A sample cup for accommodating a sample is slidably connected to the sample holder; a fixed cylinder fixed to the bracket. A first transmission shaft is fixed to the outer surface of the sample holder, and the first transmission shaft meshes intermittently with the fixed cylinder; a transmission ratchet co - axially connected to the adjusting frame and the bracket for driving the adjusting frame to rotate; a resistance measurement probe slidably connected to the bracket for measuring the resistance of the sample; a transmission member assembled on the bracket. The resistance measurement probe is linked to the transmission ratchet through the transmission member for driving the adjusting frame to change positions when the resistance measurement probe moves up and down; a crusher fixed to the bracket for crushing the sample.

[0007] Preferably, the fixed cylinder includes a sleeve, a first fixed bevel gear, and a second fixed bevel gear. The first fixed bevel gear and the second fixed bevel gear are respectively fixed to both ends of the sleeve. The first fixed bevel gear is fixed to the bottom of the bracket. A first convex tooth is fixed to the outer surface of the first fixed bevel gear, and a second convex tooth is fixed to the outer surface of the second fixed bevel gear, and the first convex tooth and the second convex tooth are staggered.

[0008] Preferably, the first transmission shaft includes a first optical shaft and a first bevel gear. The end of the first optical shaft is fixed to the outer surface of the sample holder, and the first optical shaft is rotatably connected to the adjusting frame. The first bevel gear is fixed to the other end of the first optical shaft, and the first bevel gear meshes intermittently with the first fixed bevel gear and the second fixed bevel gear.

[0009] Preferably, a first connecting shaft is fixed to the outer surface of the adjusting frame. The first connecting shaft penetrates through the sleeve, and the adjusting frame is rotationally connected to the sleeve through the first connecting shaft.

[0010] Preferably, the driving ratchet includes a fixed tooth cylinder, a driving bevel gear, and a wedge block. The fixed tooth cylinder is fixed to the end of the first connecting shaft. The driving bevel gear is sleeved on the end of the fixed tooth cylinder. The wedge block is rotationally connected to the driving bevel gear, and the driving bevel gear is linked with the fixed tooth cylinder through the wedge block.

[0011] Preferably, wedge-shaped grooves are evenly formed on the outer surface of the fixed tooth cylinder. A groove is formed on the outer surface of the driving bevel gear. A second connecting shaft is fixed in the groove. The wedge block is rotationally connected to the driving bevel gear through the second connecting shaft. A torsion spring is embedded inside the wedge block, and both ends of the torsion spring are fixedly connected to the second connecting shaft and the wedge block respectively.

[0012] Preferably, guide rods are evenly fixed to the bottom of the sample cup. The guide rods penetrate through the sample rack and are slidably connected to the sample rack. Springs are sleeved on the outer surfaces of the guide rods.

[0013] Preferably, the transmission member includes a second transmission shaft, a driving pulley, and a transmission rack. Both the second transmission shaft and the driving pulley are rotationally connected to the bracket. The transmission rack is fixedly connected to the resistance measurement probe. The transmission rack is linked with the second transmission shaft through the driving pulley.

[0014] Preferably, the second transmission shaft includes a second optical axis, a second bevel gear, and a driven pulley. The second optical axis is rotationally connected to the bracket. The second bevel gear and the driven pulley are respectively fixed to both ends of the second optical axis, and the second bevel gear meshes with the driving bevel gear.

[0015] Preferably, a synchronous belt is sleeved on the outer surface of the driving pulley. The other end of the synchronous belt is sleeved on the driven pulley. The driving pulley is linked with the driven pulley through the synchronous belt. A transmission gear is coaxially fixed to the outer surface of the driving pulley, and the transmission rack meshes with the transmission gear. An electric push rod is fixed to the outer surface of the bracket, and the output end of the electric push rod is fixedly connected to the resistance measurement probe.

[0016] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0017] 1: By rotatably connecting an adjusting frame to the bracket, and rotatably connecting a plurality of sample racks to the adjusting frame. Each sample rack is equipped with a sample cup, and the resistance measurement probe is linked with the adjusting frame through the transmission member. Whenever the resistance measurement probe moves up and down once, the adjusting frame will rotate once, switching the sample cup at different positions under the resistance measurement probe, realizing an automatic switching of the measurement process and improving the measurement efficiency.

[0018] 2: By fixing a fixed cylinder under the bracket and connecting the sample rack to the fixed cylinder through the first transmission shaft, when the sample cup is in the switching position, the sample cup will be flipped through the linkage of the first transmission shaft and the fixed cylinder, so that the measured sample can be poured out of the sample cup, avoiding affecting the next measurement, improving the measurement accuracy, and further improving the measurement efficiency. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of a petroleum coke water ash ratio measuring instrument provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the partial structure of a petroleum coke water ash ratio measuring instrument provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the overall structure of the adjusting frame and the fixed cylinder of a petroleum coke water ash ratio measuring instrument provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the overall structure of the transmission ratchet and the transmission member of a petroleum coke water ash ratio measuring instrument provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the overall structure of the transmission ratchet of a petroleum coke water ash ratio measuring instrument provided by the present invention.

[0025] Brief Description of the Drawings: 1. Bracket; 2. Adjusting frame; 21. Sample rack; 211. Sample cup; 2111. Guide rod; 2112. Spring; 212. First transmission shaft; 2121. First optical axis; 22. First connecting shaft; 2122. First bevel gear; 3. Fixed cylinder; 31. Sleeve; 32. First fixed bevel gear; 321. First convex tooth; 33. Second fixed bevel gear; 331. Second convex tooth; 4. Transmission ratchet; 41. Fixed tooth cylinder; 411. Wedge groove; 42. Transmission bevel gear; 421. Groove; 4211. Second connecting shaft; 43. Wedge block; 5. Resistance measurement probe; 51. Electric push rod; 6. Transmission member; 61. Second transmission shaft; 611. Second optical axis; 612. Second bevel gear; 613. Driven pulley; 62. Driving pulley; 621. Synchronous belt; 622. Transmission gear; 63. Transmission rack; 7. Pulverizer. Detailed Embodiments

[0026] The following description is merely exemplary in nature and is not intended to limit the present disclosure, its application, and uses. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. Each figure schematically shows the concept and principle of the embodiments of the present disclosure, and does not necessarily show the specific dimensions and their ratios of the various embodiments of the present disclosure. Specific parts in a particular figure may be exaggerated to illustrate relevant details or structures of the embodiments of the present disclosure.

[0027] Referring to Figure 1 As shown, a petroleum coke water ash ratio measuring instrument includes a bracket 1, a resistance measuring probe 5, and a pulverizer 7. The resistance measuring probe 5 is slidably connected to the bracket 1. The pulverizer 7 is fixed on the surface of the bracket 1. The pulverizer 7 is used to pulverize the sample. For example, the petroleum coke is pulverized. An electric push rod 51 is fixed on the outer surface of the bracket 1, and the output end of the electric push rod 51 is fixedly connected to the resistance measuring probe 5. By driving the resistance measuring probe 5 to move downward through the electric push rod 51, it can contact the sample to measure the sample resistance. The resistance measuring probe 5 uses the four-probe method to measure resistance. The specific models of the resistance measuring probe 5 and the pulverizer 7 are selected by those skilled in the art according to actual needs and are not specifically limited herein.

[0028] Specifically, referring to Figure 1 and Figure 2 As shown, a regulating frame 2 is rotatably connected to the bottom of the bracket 1. A plurality of sample holders 21 are evenly rotatably arranged on the outer surface of the regulating frame 2. A sample cup 211 for accommodating the sample is slidably connected to the sample holder 21. Exemplarily, at least three sample holders 21 are provided, corresponding to three workstations respectively. The three workstations are pulverization, resistance measurement, and discharging. After the petroleum coke is pulverized by the pulverizer 7, the petroleum coke powder falls into the sample cup 211. By rotating the regulating frame 2, the sample cup 211 containing the petroleum coke powder is rotated to be below the resistance measuring probe 5. The resistance measuring probe 5 descends and inserts into the petroleum coke powder to measure the resistance. The resistance measuring probe 5 rises and retracts. Then the regulating frame 2 rotates to drive the sample cup 211 to rotate to the discharging workstation for discharging. In this way, the resistivity of different petroleum cokes can be automatically measured. The method of calculating and converting the water ash ratio through the resistivity is based on a machine learning model, such as a regression model. The data of resistivity and water ash ratio are obtained through experiments. Based on this data, the machine learning model is trained. The trained machine learning model can use the resistivity to identify the water ash ratio. The specific training method of the machine learning model is not elaborated too much herein.

[0029] More specifically, referring to Figure 1 、 Figure 2 and Figure 3As shown, the fixed cylinder 3 is fixed on the bracket 1, the outer surface of the sample holder 21 is fixed with a first transmission shaft 212, and the first transmission shaft 212 is intermittently meshed with the fixed cylinder 3, the fixed cylinder 3 includes a sleeve 31, a first fixed bevel tooth 32 and a second fixed bevel tooth 33, the first fixed bevel tooth 32 and the second fixed bevel tooth 33 are respectively fixed at both ends of the sleeve 31, and the first fixed bevel tooth 32 is fixed to the bottom of the bracket 1, the outer surface of the first fixed bevel tooth 32 is fixed with a first convex tooth 321, the outer surface of the second fixed bevel tooth 33 is fixed with a second convex tooth 331, and the first convex tooth 321 and the second convex tooth 331 are staggered; the first transmission shaft 212 includes a first optical axis 2121 and a first bevel tooth 2122, the end of the first optical axis 2121 is fixed to the sample holder 21, and the first bevel tooth 2121 is fixed to the sample holder 21. The outer surface of the sample rack 21, and the first optical axis 2121 is rotatably connected to the adjustment rack 2, the first bevel gear 2122 is fixed to the other end of the first optical axis 2121, and the first bevel gear 2122 intermittently engages with the first fixed bevel gear 32 and the second fixed bevel gear 33; illustratively, when the sample rack 21 rotates, the first transmission shaft 212 moves accordingly, and when the first transmission shaft 212 moves to the position where the first convex tooth 321 is provided on the surface of the first fixed bevel gear 32, the first convex tooth 321 remains stationary, and the first transmission shaft 212 continues to move, and the first convex tooth 321 can drive the first bevel gear 2122 to rotate, thereby driving the sample rack 21 to rotate through the first optical axis 2121, and driving the sample cup 211 to flip, and discharge the sample in the sample cup 211;

[0030] The purpose is that, by staggered distribution of the first convex teeth 321 and the second convex teeth 331, the first bevel teeth 2122 can be sequentially arranged with the first fixed bevel teeth 32 and the second fixed bevel teeth 33 to realize first forward rotation and then flipping and resetting. Specifically, when the sample holder 21 moves from the measuring station to the discharging station, the sample cup 211 can flip 180 degrees, and when it continues to move to the crushing station, since the second convex teeth 331 are located below the first bevel teeth 2122, the sample cup 211 will flip 180 degrees in the opposite direction and reset, thereby preventing the sample cup 211 from always rotating in one direction; it is worth mentioning that the gear ratio between the first bevel teeth 2122 and the first convex teeth 321 and the second convex teeth 331 is set by those skilled in the art according to actual conditions and is not specifically limited here.

[0031] For further information, see Figure 1 and Figure 5As shown, a first connecting shaft 22 is fixed to the outer surface of the adjusting frame 2. The first connecting shaft 22 penetrates through the sleeve 31, and the adjusting frame 2 is rotatably connected to the sleeve 31 through the first connecting shaft 22. A transmission ratchet 4 is assembled at the end of the first connecting shaft 22. The transmission ratchet 4 is used to drive the adjusting frame 2 to rotate. The transmission ratchet 4 includes a fixed tooth cylinder 41, a transmission bevel gear 42, and a wedge block 43. The fixed tooth cylinder 41 is fixed to the end of the first connecting shaft 22. The transmission bevel gear 42 is sleeved on the end of the fixed tooth cylinder 41. The wedge block 43 is rotatably connected to the transmission bevel gear 42, and the transmission bevel gear 42 is linked to the fixed tooth cylinder 41 through the wedge block 43. Wedge grooves 411 are evenly formed on the outer surface of the fixed tooth cylinder 41. A groove 421 is formed on the outer surface of the transmission bevel gear 42. A second connecting shaft 4211 is fixed in the groove 421. The wedge block 43 is rotatably connected to the transmission bevel gear 42 through the second connecting shaft 4211. A torsion spring is embedded inside the wedge block 43. The two ends of the torsion spring are respectively fixed to the second connecting shaft 4211 and the wedge block 43. The torsion spring is used to provide a restoring elastic force for the wedge block 43. The wedge block 43 is engaged with the wedge groove 411. Exemplarily, when the rotation direction of the transmission bevel gear 42 is along the wedge surface of the wedge block 43, the wedge block 43 is not limited by the wedge groove 411 and cannot drive the fixed tooth cylinder 41 to rotate. On the contrary, it drives the fixed tooth cylinder 41 to rotate, that is, drives the adjusting frame 2 to rotate through the first connecting shaft 22. The purpose is to ensure that the adjusting frame 2 rotates and adjusts the working position only in one direction by setting the transmission ratchet 4.

[0032] Referring to Figure 1 、 Figure 2 and Figure 4 As shown, a transmission member 6 is assembled on the bracket 1. The resistance measurement probe 5 is linked to the transmission ratchet 4 through the transmission member 6 and is used to drive the adjusting frame 2 to change its position when the resistance measurement probe 5 moves up and down. Specifically, the transmission member 6 includes a second transmission shaft 61, a driving pulley 62, and a transmission rack 63. Both the second transmission shaft 61 and the driving pulley 62 are rotatably connected to the bracket 1. The transmission rack 63 is fixed to the resistance measurement probe 5. The transmission rack 63 is linked to the second transmission shaft 61 through the driving pulley 62. The second transmission shaft 61 includes a second optical shaft 611, a second bevel gear 612, and a driven pulley 613. The second optical shaft 611 is rotatably connected to the bracket 1. The second bevel gear 612 and the driven pulley 613 are respectively fixed to both ends of the second optical shaft 611, and the second bevel gear 612 meshes with the transmission bevel gear 42. A synchronous belt 621 is sleeved on the outer surface of the driving pulley 62. The other end of the synchronous belt 621 is sleeved on the driven pulley 613. The driving pulley 62 is linked to the driven pulley 613 through the synchronous belt 621. A transmission gear 622 is coaxially fixed to the outer surface of the driving pulley 62, and the transmission rack 63 meshes with the transmission gear 622.

[0033] Exemplarily, when the resistance measurement probe 5 moves up and down, it drives the transmission rack 63 to move up and down synchronously. The transmission rack 63 drives the transmission gear 622 to rotate, that is, drives the driving pulley 62 to rotate synchronously. The driving pulley 62 drives the driven pulley 613 to rotate synchronously through the timing belt 621. The driven pulley 613 drives the second bevel gear 612 to rotate synchronously through the second optical axis 611. The second bevel gear 612 can drive the transmission bevel gear 42.

[0034] It is worth mentioning that when the resistance measurement probe 5 moves downward, the rotation direction of the transmission bevel gear 42 is towards the wedge surface direction, that is, the fixed tooth cylinder 41 will not rotate. On the contrary, when the resistance measurement probe 5 moves upward and leaves the sample cup 211, the rotation direction of the transmission member 6 driving the transmission bevel gear 42 is opposite. At this time, the measurement is completed, and the adjustment frame 2 will switch stations.

[0035] It should be noted that the working frequency of the resistance measurement probe 5 needs to be greater than or equal to the crushing frequency of the crusher 7. The electric push rod 51, the resistance measurement probe 5 and the crusher 7 are automatically controlled based on a programmable logic controller. The specific control requirements are determined by those skilled in the art according to actual needs.

[0036] Refer to Figure 1 As shown, in a petroleum coke water ash ratio measuring instrument, on the basis of the first embodiment, guide rods 2111 are uniformly fixed at the bottom of the sample cup 211. The guide rods 2111 penetrate through the sample rack 21 and are slidably connected to the sample rack 21. A spring 2112 is sleeved on the outer surface of the guide rods 2111. The spring 2112 is used to provide a restoring elastic force for the sample cup 211. A weighing sensor or a pressure sensor can be installed on the sample rack 21, and the detection end is in contact with the bottom of the guide rod 2111. The purpose is to detect the weight of the sample cup 211, so as to calculate the weight of the sample. In this way, the weight loss of the sample after being crushed by the crusher 7 can be calculated. The weight loss is used as the measurement weight of the water ash ratio, which can further improve the accuracy of the water ash ratio measurement.

[0037] In the above text, the exemplary embodiments of the solutions proposed in the present disclosure are described in detail with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed in the present disclosure can be made without exceeding the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A petroleum coke water-to-ash ratio measuring instrument, characterized in that, Comprising: A bracket (1); An adjusting frame (2), rotatably connected to the bracket (1). A plurality of sample holders (21) are evenly rotatably arranged on the outer surface of the adjusting frame (2). A sample cup (211) for accommodating a sample is slidably connected to the sample holder (21). Guide rods (2111) are evenly fixed to the bottom of the sample cup (211). The guide rods (2111) penetrate through the sample holder (21) and are slidably connected to the sample holder (21). A spring (2112) is sleeved on the outer surface of the guide rod (2111); A fixed cylinder (3), fixed to the bracket (1). A first transmission shaft (212) is fixed to the outer surface of the sample holder (21), and the first transmission shaft (212) is intermittently engaged with the fixed cylinder (3); A transmission ratchet (4), coaxially connected to the adjusting frame (2) and the bracket (1), for driving the adjusting frame (2) to rotate; A resistance measurement probe (5), slidably connected to the bracket (1), for measuring the resistance of the sample; A transmission member (6), assembled on the bracket (1). The resistance measurement probe (5) is linked to the transmission ratchet (4) through the transmission member (6), for driving the adjusting frame (2) to change positions when the resistance measurement probe (5) moves up and down; A pulverizer (7), fixed to the bracket (1), for pulverizing the sample; The fixed cylinder (3) includes a sleeve (31), a first fixed bevel gear (32) and a second fixed bevel gear (33). The first fixed bevel gear (32) and the second fixed bevel gear (33) are respectively fixed to both ends of the sleeve (31). The first fixed bevel gear (32) is fixed to the bottom of the bracket (1). A first convex tooth (321) is fixed to the outer surface of the first fixed bevel gear (32). A second convex tooth (331) is fixed to the outer surface of the second fixed bevel gear (33), and the first convex tooth (321) and the second convex tooth (331) are staggered; A first connecting shaft (22) is fixed to the outer surface of the adjusting frame (2). The first connecting shaft (22) penetrates through the sleeve (31), and the adjusting frame (2) is rotatably connected to the sleeve (31) through the first connecting shaft (22); The transmission ratchet (4) includes a fixed tooth cylinder (41), a transmission bevel gear (42) and a wedge block (43). The fixed tooth cylinder (41) is fixed to the end of the first connecting shaft (22). The transmission bevel gear (42) is sleeved on the end of the fixed tooth cylinder (41). The wedge block (43) is rotatably connected to the transmission bevel gear (42), and the transmission bevel gear (42) is linked to the fixed tooth cylinder (41) through the wedge block (43).

2. The petroleum coke water ash ratio measuring instrument according to claim 1, wherein The first transmission shaft (212) includes a first optical shaft (2121) and a first bevel gear (2122). The end of the first optical shaft (2121) is fixed to the outer surface of the sample holder (21), and the first optical shaft (2121) is rotatably connected to the adjusting frame (2). The first bevel gear (2122) is fixed to the other end of the first optical shaft (2121), and the first bevel gear (2122) is intermittently engaged with the first fixed bevel gear (32) and the second fixed bevel gear (33).

3. The petcoke water-to-ash ratio measuring instrument according to claim 1, characterized in that, The outer surface of the fixed gear cylinder (41) is evenly provided with wedge-shaped grooves (411). The outer surface of the transmission bevel gear (42) is provided with a groove (421). A second connecting shaft (4211) is fixed in the groove (421). The wedge-shaped block (43) is rotatably connected to the transmission bevel gear (42) through the second connecting shaft (4211). A torsion spring is embedded in the wedge-shaped block (43), and the two ends of the torsion spring are respectively fixed to the second connecting shaft (4211) and the wedge-shaped block (43).

4. The petroleum coke water ash ratio measuring instrument according to claim 1, characterized in that The transmission member (6) includes a second transmission shaft (61), a driving pulley (62) and a transmission rack (63). The second transmission shaft (61) and the driving pulley (62) are both rotatably connected to the bracket (1). The transmission rack (63) is fixedly connected to the resistance measuring probe (5). The transmission rack (63) is linked with the second transmission shaft (61) through the driving pulley (62).

5. The petcoke water-to-ash ratio measuring instrument according to claim 4, wherein The second transmission shaft (61) includes a second optical shaft (611), a second bevel gear (612) and a driven pulley (613). The second optical shaft (611) is rotatably connected to the bracket (1). The second bevel gear (612) and the driven pulley (613) are respectively fixed to both ends of the second optical shaft (611), and the second bevel gear (612) meshes with the transmission bevel gear (42).

6. The petcoke water-to-ash ratio measuring instrument according to claim 5, wherein A synchronous belt (621) is sleeved on the outer surface of the driving pulley (62). The other end of the synchronous belt (621) is sleeved on the driven pulley (613). The driving pulley (62) is linked with the driven pulley (613) through the synchronous belt (621). A transmission gear (622) is coaxially fixed on the outer surface of the driving pulley (62), and the transmission rack (63) meshes with the transmission gear (622). An electric push rod (51) is fixed on the outer surface of the bracket (1), and the output end of the electric push rod (51) is fixedly connected to the resistance measuring probe (5).

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