Novel petroleum coke water cement ratio tester

Abstract

The invention discloses a novel petroleum coke water-cement ratio determinator, and relates to the field of water-cement ratio determination. According to the technical scheme, the device comprises a support; the adjusting frame is rotationally connected with the support, a plurality of sample frames are uniformly and rotationally arranged on the outer surface of the adjusting frame, and sample cups used for containing samples are connected to the sample frames in a sliding mode; the fixed cylinder is fixed on the bracket, a first transmission shaft is fixed on the outer surface of the sample holder, and the first transmission shaft is intermittently meshed with the fixed cylinder; the transmission ratchet wheel is coaxially connected with the adjusting frame and the bracket and is used for driving the adjusting frame to rotate; the resistance measuring probe is in sliding connection with the bracket and is used for measuring the resistance of the sample; the transmission part is assembled on the support, the resistance measuring probe is in linkage with the transmission ratchet wheel through the transmission part, and the transmission part is used for driving the adjusting frame to switch positions when the resistance measuring probe translates up and down; and the crusher is fixed on the bracket and is used for crushing the sample. The measurement efficiency is improved by automatically switching the measurement process.

Description

Technical Field

[0001] The invention relates to the field of water-cement ratio determination, in particular to a novel petroleum coke water-cement ratio determination instrument. Background Art

[0002] Petroleum coke, referred to as petroleum coke, is a product obtained by separating light and heavy oils through distillation of crude oil and then thermal cracking of heavy oil; Qualified petroleum coke can be used as fuel. To determine whether the petroleum coke is qualified, it is mainly necessary to test its water-ash ratio, that is, the ratio of water to ash. The current detection methods mainly include combustion detection and resistivity detection. Regardless of the detection method, it requires the cooperation of multiple equipment for detection, which is cumbersome to operate. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a novel petroleum coke water-cement ratio measuring instrument to achieve automatic switching of measuring procedures and improve measuring efficiency.

[0004] In order to achieve the above technical purpose, the present invention provides a new petroleum coke water-cement ratio measuring instrument: The utility model comprises: a support; an adjusting frame, which is rotatably connected with the support, and a plurality of sample frames are evenly rotated on the outer surface of the adjusting frame, and a sample cup for accommodating samples is slidably connected to the sample frame; a fixing cylinder, which is fixed on the support, and a first transmission shaft is fixed on the outer surface of the sample frame, and the first transmission shaft is intermittently meshed with the fixing cylinder; a transmission ratchet, which is coaxially connected with the adjusting frame and the support, and is used to drive the adjusting frame to rotate; a resistance measuring probe, which is slidably connected with the support, and is used to measure the resistance of the sample; a transmission member, which is assembled on the support, and the resistance measuring probe is linked to the transmission ratchet through the transmission member, and is used to drive the adjusting frame to change its position when the resistance measuring probe is translated up and down; a crusher, which is fixed on the support, and is used to crush the sample.

[0005] Preferably, the fixed cylinder includes a sleeve, a first fixed bevel tooth and a second fixed bevel tooth, the first fixed bevel tooth and the second fixed bevel tooth are respectively fixed at two ends of the sleeve, and the first fixed bevel tooth is fixed to the bottom of the bracket, the outer surface of the first fixed bevel tooth is fixed with a first convex tooth, the outer surface of the second fixed bevel tooth is fixed with a second convex tooth, and the first convex tooth and the second convex tooth are staggered.

[0006] Preferably, the first transmission shaft includes a first optical axis and a first bevel gear, the end of the first optical axis is fixed to the outer surface of the sample holder, and the first optical axis is rotatably connected to the adjustment frame, the first bevel gear is fixed to the other end of the first optical axis, and the first bevel gear is intermittently engaged with the first fixed bevel gear and the second fixed bevel gear.

[0007] Preferably, a first connecting shaft is fixed to the outer surface of the adjusting frame, the first connecting shaft passes through the sleeve, and the adjusting frame is rotatably connected to the sleeve via the first connecting shaft.

[0008] Preferably, the transmission ratchet includes a fixed gear cylinder, a transmission bevel gear and a wedge block, the fixed gear cylinder is fixed to the end of the first connecting shaft, the transmission bevel gear is sleeved on the end of the fixed gear cylinder, the wedge block is rotatably connected to the transmission bevel gear, and the transmission bevel gear is linked to the fixed gear cylinder through the wedge block.

[0009] Preferably, the outer surface of the fixed gear cylinder is evenly provided with wedge-shaped grooves, the outer surface of the transmission bevel gear is provided with a groove, a second connecting shaft is fixed in the groove, the wedge block is rotatably connected to the transmission bevel gear through the second connecting shaft, a torsion spring is embedded in the wedge block, and the two ends of the torsion spring are respectively fixedly connected to the second connecting shaft and the wedge block.

[0010] Preferably, a guide rod is evenly fixed to the bottom of the sample cup, the guide rod passes through the sample rack and is slidably connected to the sample rack, and a spring is sleeved on the outer surface of the guide rod.

[0011] Preferably, the transmission member includes a second transmission shaft, a driving pulley and a transmission rack, the second transmission shaft and the driving pulley are both rotatably connected to the bracket, the transmission rack is fixedly connected to the resistance measuring probe, and the transmission rack is linked to the second transmission shaft through the driving pulley.

[0012] Preferably, the second transmission shaft comprises a second optical axis, a second bevel gear and a driven pulley, the second optical axis is rotatably connected to the bracket, the second bevel gear and the driven pulley are respectively fixed at two ends of the second optical axis, and the second bevel gear is meshed with the transmission bevel gear.

[0013] 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, and 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 is meshed 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 measuring probe.

[0014] It can be seen from the above technical solutions that the present application has the following beneficial effects: 1: An adjusting frame is rotatably connected to the bracket, and a plurality of sample frames are rotatably connected to the adjusting frame. Each sample frame is equipped with a sample cup, and the resistance measuring probe is linked to the adjusting frame through a transmission member. Whenever the resistance measuring probe moves up and down, the adjusting frame rotates once, switching the sample cups at different positions to the bottom of the resistance measuring probe, thereby realizing automatic switching of the measuring process and improving the measuring efficiency.

[0015] 2: A fixed cylinder is fixed under the bracket, and the sample rack is linked 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 first transmission shaft and the fixed cylinder, so that the measured sample can be poured out of the sample cup to avoid affecting the next measurement, improve the measurement accuracy, and further improve the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the overall structure of a novel petroleum coke water-to-ash ratio measuring instrument provided by the present invention; Figure 2 A schematic diagram of the partial structure of a novel petroleum coke water-cement ratio measuring instrument provided by the present invention; Figure 3 A schematic diagram of the overall structure of an adjustment frame and a fixing cylinder of a novel petroleum coke water-cement ratio measuring instrument provided by the present invention; Figure 4 A schematic diagram of the overall structure of a transmission ratchet and transmission parts of a novel petroleum coke water-cement ratio tester provided by the present invention; Figure 5 The present invention provides a schematic diagram of the overall structure of a transmission ratchet of a novel petroleum coke water-cement ratio measuring instrument.

[0018] Description of the drawings: 1. bracket; 2. adjustment 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 gear; 33. second fixed bevel gear; 331. second convex gear; 4. transmission ratchet; 4 1. Fixed gear cylinder; 411. Wedge groove; 42. Transmission bevel gear; 421. Groove; 4211. Second connecting shaft; 43. Wedge block; 5. Resistance measuring 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. Crusher. DETAILED DESCRIPTION

[0019] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, and use. It should be understood that in all of these figures, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically represent the concepts and principles of the embodiments of the present disclosure, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific drawings may be exaggerated to illustrate the relevant details or structures of the embodiments of the present disclosure.

[0020] See also Figure 1 As shown, a novel petroleum coke water-cement ratio measuring instrument includes a bracket 1, a resistance measuring probe 5 and a crusher 7. The resistance measuring probe 5 is slidably connected to the bracket 1, and the crusher 7 is fixed on the surface of the bracket 1. The crusher 7 is used to crush the sample, and the sample is, for example, petroleum coke. 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. The resistance measuring probe 5 is driven downward by the electric push rod 51 to contact the sample and measure the resistance of the sample. The resistance measuring probe 5 adopts a four-needle resistance measurement method. The specific models of the resistance measuring probe 5 and the crusher 7 are selected by technicians in this field according to actual needs and are not specifically limited here.

[0021] For details, see Figure 1 and Figure 2 As shown, the bottom of the bracket 1 is rotatably connected to an adjustment frame 2, and the outer surface of the adjustment frame 2 is evenly rotated with multiple sample frames 21, and a sample cup 211 for accommodating samples is slidably connected to the sample frame 21; illustratively, at least three sample frames 21 are provided, corresponding to three workstations, and the three workstations are crushing, resistance measurement and discharging, respectively. After the petroleum coke is put into the crusher 7 for crushing, the petroleum coke powder falls into the sample cup 211, and the adjustment frame 2 is rotated to switch the sample cup 211 for accommodating the petroleum coke powder to rotate below the resistance measurement probe 5, and the resistance measurement probe 5 is inserted into the petroleum coke powder by descending to measure the resistance, and the resistance measurement probe 5 is raised and withdrawn, and the adjustment frame 2 is rotated again to drive the sample cup 211 to the discharging workstation for discharging, and so on and so forth, the resistivity of different petroleum cokes can be automatically measured, and the method of converting the water-cement ratio by resistivity calculation is based on a machine learning model, such as a regression model, and the data of resistivity and water-cement ratio are obtained through experiments, and the machine learning model is trained based on this data. The trained machine learning model can use resistivity to identify the water-cement ratio, and the specific training method of the machine learning model will not be elaborated in detail here.

[0022] For more details, see 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; 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.

[0023] For further information, see Figure 1 and Figure 5As shown, a first connecting shaft 22 is fixed to the outer surface of the adjustment frame 2, the first connecting shaft 22 passes through the sleeve 31, and the adjustment frame 2 is rotatably connected to the sleeve 31 through the first connecting shaft 22, and a transmission ratchet 4 is installed at the end of the first connecting shaft 22, and the transmission ratchet 4 is used to drive the adjustment frame 2 to rotate, and the transmission ratchet 4 includes a fixed gear cylinder 41, a transmission bevel gear 42 and a wedge block 43, the fixed gear 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 gear 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 gear cylinder 41 through the wedge block 43, the outer surface of the fixed gear cylinder 41 is evenly provided with wedge grooves 411, the outer surface of the transmission bevel gear 42 is provided with grooves 421, and the grooves 42 1 is fixed with a second connecting shaft 4211, the wedge block 43 is rotatably connected with the transmission bevel gear 42 through the second connecting shaft 4211, a torsion spring is embedded in the wedge block 43, and the two ends of the torsion spring are respectively fixedly connected with the second connecting shaft 4211 and the wedge block 43, and the torsion spring is used to provide a resetting elastic force for the wedge block 43, and the wedge block 43 is engaged with the wedge groove 411; illustratively, 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 gear cylinder 41 to rotate, otherwise, it drives the fixed gear cylinder 41 to rotate, that is, drives the adjustment frame 2 to rotate through the first connecting shaft 22; the purpose is to ensure that the adjustment frame 2 is rotated in only one direction to adjust the station by setting the transmission ratchet 4.

[0024] See also Figure 1 , Figure 2 and Figure 4 As shown, the bracket 1 is equipped with a transmission member 6, and the resistance measuring probe 5 is linked to the transmission ratchet 4 through the transmission member 6, which is used to drive the adjustment frame 2 to change its position when the resistance measuring 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, 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, and 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 axis 611, a second bevel gear 62 and a second bevel gear 63. 12 and a driven pulley 613, the second optical axis 611 is rotatably connected to the bracket 1, the second bevel gear 612 and the driven pulley 613 are respectively fixed to the two ends of the second optical axis 611, and the second bevel gear 612 is meshed with the transmission bevel gear 42; the outer surface of the driving pulley 62 is sleeved with a synchronous belt 621, the other end of the synchronous belt 621 is sleeved on the driven pulley 613, and the driving pulley 62 is linked with the driven pulley 613 through the synchronous belt 621; the outer surface of the driving pulley 62 is coaxially fixed with a transmission gear 622, and the transmission rack 63 is meshed with the transmission gear 622; Exemplarily, when the resistance measuring probe 5 is translated up and down, the transmission rack 63 is driven to translate up and down synchronously, and the transmission rack 63 drives the transmission gear 622 to rotate, that is, the driving pulley 62 is driven to rotate synchronously, and the driving pulley 62 drives the driven pulley 613 to rotate synchronously through the synchronous belt 621, and the driven pulley 613 drives the second bevel gear 612 to rotate synchronously through the second optical axis 611, and the second bevel gear 612 can drive the transmission bevel gear 42; It is worth mentioning that when the resistance measuring probe 5 moves downward, the rotation direction of the transmission bevel gear 42 is toward the wedge surface, that is, the fixed gear cylinder 41 will not rotate. On the contrary, after the resistance measuring probe 5 moves upward and leaves the sample cup 211, the transmission member 6 drives the transmission bevel gear 42 to rotate in the opposite direction. At this time, the measurement is completed and the adjustment frame 2 will switch the working position.

[0025] It should be noted that the operating frequency of the resistance measuring probe 5 needs to be greater than or equal to the crushing frequency of the crusher 7. The automatic operation control of the electric push rod 51, the resistance measuring probe 5 and the crusher 7 is based on a programmable logic controller. The specific control requirements are determined by technical personnel in this field according to actual needs.

[0026] See also Figure 1 As shown, a novel petroleum coke water-cement ratio measuring instrument is provided. On the basis of the first embodiment, a guide rod 2111 is evenly fixed to the bottom of a sample cup 211, the guide rod 2111 penetrates the sample rack 21 and is slidably connected to the sample rack 21, a spring 2112 is sleeved on the outer surface of the guide rod 2111, the spring 2112 is used to provide a resetting 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 contacts the bottom of the guide rod 2111, the purpose is to detect the weight of the sample cup 211, thereby calculating the weight of the sample, so that the weight loss of the sample after being crushed by the crusher 7 can be calculated, and the weight loss is used as the measurement weight of the water-cement ratio, so that the accuracy of the water-cement ratio measurement can be further improved.

[0027] The exemplary implementation scheme of the present disclosure is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure, which is determined by the attached claims.

Claims

1. A petroleum coke water-cement ratio measuring instrument, characterized in that: include: Bracket (1); An adjustment frame (2) is rotatably connected to the support (1); a plurality of sample frames (21) are evenly rotatably provided on the outer surface of the adjustment frame (2); a sample cup (211) for accommodating a sample is slidably connected to the sample frame (21); a guide rod (2111) is evenly fixed to the bottom of the sample cup (211); the guide rod (2111) passes through the sample frame (21) and is slidably connected to the sample frame (21); and a spring (2112) is sleeved on the outer surface of the guide rod (2111); A fixed cylinder (3) is fixed on the support (1); a first transmission shaft (212) is fixed on the outer surface of the sample rack (21), and the first transmission shaft (212) is intermittently meshed with the fixed cylinder (3); A transmission ratchet (4) is coaxially connected to the adjustment frame (2) and the bracket (1), and is used to drive the adjustment frame (2) to rotate; A resistance measuring probe (5) is slidably connected to the support (1) and is used to measure the resistance of the sample; A transmission member (6) is mounted on the bracket (1), and the resistance measuring probe (5) is linked to the transmission ratchet (4) through the transmission member (6) and is used to drive the adjustment frame (2) to change position when the resistance measuring probe (5) moves up and down; The crusher (7) is fixed on the support (1) and is used to crush the sample.

2. A petroleum coke water-cement ratio measuring instrument according to claim 1, characterized in that: The fixed cylinder (3) comprises 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 to two ends of the sleeve (31), and the first fixed bevel tooth (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 tooth (32); a second convex tooth (331) is fixed to the outer surface of the second fixed bevel tooth (33); and the first convex tooth (321) and the second convex tooth (331) are arranged in a staggered manner.

3. A petroleum coke water-cement ratio measuring instrument according to claim 2, characterized in that: The first transmission shaft (212) comprises a first optical axis (2121) and a first bevel tooth (2122); the end of the first optical axis (2121) is fixed to the outer surface of the sample holder (21), and the first optical axis (2121) is rotatably connected to the adjustment holder (2); the first bevel tooth (2122) is fixed to the other end of the first optical axis (2121), and the first bevel tooth (2122) intermittently meshes with the first fixed bevel tooth (32) and the second fixed bevel tooth (33).

4. A petroleum coke water-cement ratio measuring instrument according to claim 2, characterized in that: A first connecting shaft (22) is fixed to the outer surface of the adjustment frame (2), the first connecting shaft (22) passes through the sleeve (31), and the adjustment frame (2) is rotatably connected to the sleeve (31) via the first connecting shaft (22).

5. A petroleum coke water-cement ratio measuring instrument according to claim 4, characterized in that: The transmission ratchet (4) comprises a fixed gear cylinder (41), a transmission bevel tooth (42) and a wedge block (43); the fixed gear cylinder (41) is fixed to the end of a first connecting shaft (22); the transmission bevel tooth (42) is sleeved on the end of the fixed gear cylinder (41); the wedge block (43) is rotatably connected to the transmission bevel tooth (42); and the transmission bevel tooth (42) is linked to the fixed gear cylinder (41) via the wedge block (43).

6. A petroleum coke water-cement ratio measuring instrument according to claim 5, 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 block (43) is rotatably connected to the transmission bevel gear (42) via the second connecting shaft (4211); a torsion spring is embedded in the wedge block (43); two ends of the torsion spring are respectively fixedly connected to the second connecting shaft (4211) and the wedge block (43).

7. A petroleum coke water-cement ratio measuring instrument according to claim 5, characterized in that: The transmission member (6) comprises 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); and the transmission rack (63) is linked to the second transmission shaft (61) via the driving pulley (62).

8. A petroleum coke water-cement ratio measuring instrument according to claim 7, characterized in that: The second transmission shaft (61) comprises a second optical axis (611), a second bevel tooth (612) and a driven pulley (613); the second optical axis (611) is rotatably connected to the bracket (1); the second bevel tooth (612) and the driven pulley (613) are respectively fixed to two ends of the second optical axis (611); and the second bevel tooth (612) is meshed with the transmission bevel tooth (42).

9. The petroleum coke water-cement ratio measuring instrument according to claim 7, characterized in that: The outer surface of the driving pulley (62) is sleeved with a synchronous belt (621), the other end of the synchronous belt (621) is sleeved on the driven pulley (613), and 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) is meshed with the transmission gear (622); An electric push rod (51) is fixed on the outer surface of the bracket (1), and an output end of the electric push rod (51) is fixedly connected to a resistance measuring probe (5).

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