Thick oil viscosity measuring device

Abstract

The invention discloses a thickened oil viscosity measuring device, and relates to the technical field of thickened oil viscosity detection. Comprising a base, a collecting cylinder is arranged on the base, detection cylinders are arranged on the base in an array mode, and oil discharging valves are arranged on the detection cylinders; a lifting mechanism is arranged on the base, the lifting mechanism comprises a lifting seat, rotor mechanisms are arranged on the lifting seat in a sliding and array mode, radial stirring mechanisms and fixing mechanisms are arranged in the rotor mechanisms, a filter plate and a bottom plate are arranged in the detection cylinder, and a clamping mechanism is arranged on the detection cylinder and used for fixing the filter plate and the bottom plate; a scraping mechanism is arranged at the bottom end of the lifting seat and is used for scraping the filter plate and the bottom plate; a mounting frame is connected to the lifting seat, and a driving mechanism is arranged on the mounting frame and used for driving the rotor mechanisms; the device can be used for measuring the viscosity of the thickened oil, is rich in function, can be used for pretreating the thickened oil, and is convenient in subsequent maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy oil viscosity detection, and particularly to a heavy oil viscosity measuring device. Background Art

[0002] Heavy oil viscosity detection is an important operation in the petroleum industry for evaluating the fluidity of heavy oil. Due to the high viscosity of heavy oil, it is often difficult to flow, and understanding its viscosity is of great significance for storage, transportation, processing, and production processes. Currently, there are various heavy oil viscosity detection methods. Among them, the rotational viscometer method is a commonly used detection method, that is, when the rotor rotates in the sample, the viscosity of the sample generates resistance, and the rotation speed of the rotor and the required torque are proportional to the viscosity; and the number of heavy oil viscosity detections is generally multiple to ensure the accuracy of the detection results; the existing detection equipment has a single function, and the pretreatment of heavy oil and the subsequent maintenance of the equipment are relatively cumbersome. Based on this, the present invention proposes a measuring device that can measure the viscosity of heavy oil, has rich functions, can perform pretreatment on heavy oil, and is convenient for subsequent maintenance. Summary of the Invention

[0003] Aiming at the above technical problems, the present invention can measure the viscosity of heavy oil, has rich functions, can perform pretreatment on heavy oil, and is convenient for subsequent maintenance.

[0004] The implementation scheme of the present invention is as follows: A heavy oil viscosity measuring device includes a base, a collection cylinder is arranged on the base, detection cylinders are arranged in an array on the base, and an oil discharge valve is arranged on the detection cylinder; a lifting mechanism is arranged on the base, the lifting mechanism includes a lifting seat, rotor mechanisms are slidably and arrayedly arranged on the lifting seat, a radial stirring mechanism and a fixing mechanism are arranged inside the rotor mechanism, a filter plate and a bottom plate are arranged inside the detection cylinder, and a clamping mechanism is arranged on the detection cylinder for fixing the filter plate and the bottom plate; a scraping mechanism is arranged at the bottom end of the lifting seat for scraping the filter plate and the bottom plate; an installation frame is connected to the lifting seat, and a driving mechanism is arranged on the installation frame for driving each rotor mechanism.

[0005] Further, the lifting mechanism includes a motor one, a lead screw one, and a guide rod one arranged on the base. The motor one is used to drive the lead screw one. The lifting seat is movably arranged on the lead screw one and the guide rod one, and the lifting seat and the lead screw one form a screw pair. An installation rod is arranged on the lifting seat, the rotor mechanism is slidably arranged on the installation rod, and a control electric cylinder is arranged inside the lifting seat. A control board is arranged on the telescopic rod of the control electric cylinder, and the control board is used to control the movement of the rotor mechanism; a gear ring is rotatably installed on the lifting seat, and the gear ring meshes with the rotor mechanism for linkage.

[0006] Further, the rotor mechanism includes a sliding seat slidably mounted on the mounting rod. A rotor cylinder is rotatably mounted on the sliding seat. A connecting gear is provided at the top of the rotor cylinder, and the connecting gear meshes with the toothed ring for linkage. A mating groove is formed in the sliding seat and mates with the driving mechanism for driving. A connecting rod is rotatably mounted on the sliding seat, and one end of the connecting rod is rotatably connected to the control board. The stirring mechanism and the fixing mechanism are arranged inside the rotor cylinder.

[0007] Further, the driving mechanism includes a indexing motor provided on the mounting frame. A indexing seat is provided on the telescopic rod of the indexing motor. A telescopic frame is telescopically provided on the indexing seat. A first spring is connected between the telescopic frame and the indexing seat. A position oil cylinder is provided at one end of the telescopic frame. A driving motor is provided on the telescopic rod of the position oil cylinder. A mating part is provided on the output shaft of the driving motor, and the mating part mates with the mating groove on the sliding seat for driving.

[0008] Further, the stirring mechanism includes a radial control electric cylinder arranged inside the rotor cylinder. A sphere is provided on the telescopic rod of the radial control electric cylinder, and an electric heating wire is arranged inside the sphere for preheating. A stirring shaft is radially telescopically arranged on the rotor cylinder. One end of the stirring shaft facing the wall surface of the rotor cylinder forms a smooth surface with the rotor cylinder, and a third spring is connected between the stirring shaft and the inner wall of the rotor cylinder. The stirring shaft is pushed by the sphere.

[0009] Further, a pushing mounting plate is provided on the telescopic rod of the radial control electric cylinder, and an electromagnetic telescopic push rod is provided on the pushing mounting plate for controlling the movement of the fixing mechanism.

[0010] Further, the fixing mechanism includes a fixing seat telescopically arranged on the rotor cylinder. A fourth spring is connected between the fixing seat and the wall surface of the rotor cylinder. A contact plate is provided on the fixing seat, and the contact plate is pushed by the electromagnetic telescopic push rod.

[0011] Further, the clamping mechanism includes a fixed control electric cylinder provided on the detection cylinder. A fixed mounting frame is provided on the telescopic rod of the fixed control electric cylinder. A pushing seat is provided on the fixed mounting frame. A telescopic fixing rod is telescopically arranged on the detection cylinder. A second spring is connected between the telescopic fixing rod and the detection cylinder. The telescopic fixing rod is pushed by the pushing seat. Fixing holes are formed on the circumferences of the filter plate and the bottom plate, and the fixing holes mate with the telescopic fixing rod to achieve fixation.

[0012] Further, the scraping mechanism includes a scraping motor arranged inside the lifting seat, and a mounting ring rotatably arranged on the lifting seat. A connecting frame is provided on the output shaft of the scraping motor, and the connecting frame is connected to the mounting ring. A scraping frame is connected to the connecting frame. The scraping frame is composed of a first scraping part, a third scraping part and a second scraping part, and the second scraping part is located between the first scraping part and the third scraping part.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) when the heavy oil is put into the filter plate, it is filtered to remove impurities in the heavy oil; when the heavy oil is put into the filter plate, the rotor mechanism in the target position can be driven by the driving mechanism, that is, the matching part matches with the matching groove on the slide seat to realize the driving; (2) by driving the rotor barrel to rotate, the filter plate can be driven to rotate, so that each area of ​​the filter plate can filter the heavy oil, and the heavy oil can be mixed by the stirring shaft; (3) the fixed seat supports and fixes the filter plate and the bottom plate, so as to drive the filter plate and the bottom plate to be separated from the inside of the detection tube together, and the bottom plate is located at the bottom of the detection tube, and can contact with the inner wall of the detection tube through the bottom plate to scrape off the residual heavy oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle.

[0016] Figure 3 It is a schematic diagram of the installation structure of the driving mechanism of the present invention.

[0017] Figure 4 It is a schematic diagram of the lifting seat structure of the present invention.

[0018] Figure 5 It is a schematic diagram of the internal structure of the lifting seat of the present invention.

[0019] Figure 6 It is a schematic diagram of the structure of the scraping mechanism of the present invention.

[0020] Figure 7 It is a schematic diagram of the structure of the detection tube of the present invention.

[0021] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at the A mark in the middle.

[0022] Figure 9 It is a schematic diagram of the rotor barrel structure of the present invention.

[0023] Figure 10 It is a schematic diagram of the internal structure of the rotor barrel of the present invention.

[0024] Figure 11 It is a schematic diagram of the partial installation structure inside the rotor barrel of the present invention.

[0025] Reference numerals: 1 - base; 2 - first motor; 3 - first lead screw; 4 - first guide rod; 5 - mounting bracket; 6 - indexing motor; 7 - collection cylinder; 8 - detection cylinder; 9 - oil drain valve; 10 - lifting seat; 11 - indexing seat; 12 - telescopic bracket; 13 - first spring; 14 - position oil cylinder; 15 - drive motor; 16 - mating part; 17 - mounting rod; 18 - sliding seat; 19 - connecting rod; 20 - gear ring; 21 - control board; 22 - control electric cylinder; 23 - mounting ring; 24 - scraping motor; 25 - connecting frame; 26 - first scraping part; 27 - second scraping part; 28 - third scraping part; 29 - fixed control electric cylinder; 30 - fixed mounting bracket; 31 - pushing seat; 32 - telescopic fixed rod; 33 - second spring; 34 - rotor cylinder; 35 - filter plate; 36 - bottom plate; 37 - connecting gear; 38 - radial control electric cylinder; 39 - sphere; 40 - stirring shaft; 41 - third spring; 42 - pushing mounting plate; 43 - electromagnetic telescopic push rod; 44 - fixed seat; 45 - contact plate; 46 - fourth spring. Detailed implementation manner

[0026] Example: As Figures 1 to 11 shown, a viscous oil viscosity measuring device includes a base 1, a collection cylinder 7 is arranged on the base 1, detection cylinders 8 are arranged in an array on the base 1, and an oil drain valve 9 is arranged on the detection cylinder 8; a lifting mechanism is arranged on the base 1, the lifting mechanism includes a lifting seat 10, a rotor mechanism is slidably and arrayedly arranged on the lifting seat 10, a radial stirring mechanism and a fixing mechanism are arranged inside the rotor mechanism, a filter plate 35 and a bottom plate 36 are arranged inside the detection cylinder 8, and a clamping mechanism is arranged on the detection cylinder 8 for fixing the filter plate 35 and the bottom plate 36; a scraping mechanism is arranged at the bottom end of the lifting seat 10 for scraping the filter plate 35 and the bottom plate 36; a mounting bracket 5 is connected to the lifting seat 10, and a driving mechanism is arranged on the mounting bracket 5 for driving each rotor mechanism.

[0027] The lifting mechanism includes a first motor 2, a first lead screw 3 and a first guide rod 4 arranged on the base 1, the first motor 2 is used to drive the first lead screw 3, the lifting seat 10 is movably arranged on the first lead screw 3 and the first guide rod 4, and the lifting seat 10 forms a screw pair with the first lead screw 3. A mounting rod 17 is arranged on the lifting seat 10, the rotor mechanism is slidably arranged on the mounting rod 17, and a control electric cylinder 22 is arranged inside the lifting seat 10. A control board 21 is arranged on the telescopic rod of the control electric cylinder 22, and the control board 21 is used to control the movement of the rotor mechanism; a gear ring 20 is rotatably mounted on the lifting seat 10, and the gear ring 20 meshes with the rotor mechanism for linkage.

[0028] The rotor mechanism includes a sliding seat 18 slidably mounted on the mounting rod 17. A rotor cylinder 34 is rotatably mounted on the sliding seat 18. A connecting gear 37 is provided at the top of the rotor cylinder 34, and the connecting gear 37 meshes with the gear ring 20 for linkage. A fitting groove is formed in the sliding seat 18 and cooperates with the driving mechanism for driving. A connecting rod 19 is rotatably mounted on the sliding seat 18, and one end of the connecting rod 19 is rotatably connected to the control board 21. The stirring mechanism and the fixing mechanism are arranged inside the rotor cylinder 34. The driving mechanism includes a indexing motor 6 provided on the mounting frame 5. A indexing seat 11 is provided on the telescopic rod of the indexing motor 6. A telescopic frame 12 is telescopically arranged on the indexing seat 11. A first spring 13 is connected between the telescopic frame 12 and the indexing seat 11. A position oil cylinder 14 is provided at one end of the telescopic frame 12. A driving motor 15 is provided on the telescopic rod of the position oil cylinder 14. A fitting portion 16 is provided on the output shaft of the driving motor 15, and the fitting portion 16 cooperates with the fitting groove on the sliding seat 18 for driving. The stirring mechanism includes a radial control electric cylinder 38 arranged inside the rotor cylinder 34. A sphere 39 is provided on the telescopic rod of the radial control electric cylinder 38. A heating wire is arranged inside the sphere 39 for preheating. A stirring shaft 40 is radially telescopically arranged on the rotor cylinder 34. One end of the stirring shaft 40 facing the wall surface of the rotor cylinder 34 forms a smooth surface with the rotor cylinder 34, and a third spring 41 is connected between the stirring shaft 40 and the inner wall of the rotor cylinder 34. The stirring shaft 40 is pushed by the sphere 39.

[0029] A pushing mounting plate 42 is provided on the telescopic rod of the radial control electric cylinder 38. An electromagnetic telescopic push rod 43 is provided on the pushing mounting plate 42 for controlling the movement of the fixing mechanism. The fixing mechanism includes a fixing seat 44 telescopically arranged on the rotor cylinder 34. A fourth spring 46 is connected between the fixing seat 44 and the wall surface of the rotor cylinder 34. A contact plate 45 is provided on the fixing seat 44, and the contact plate 45 is pushed by the electromagnetic telescopic push rod 43.

[0030] The clamping mechanism includes a fixed control electric cylinder 29 provided on the detection cylinder 8. A fixed mounting frame 30 is provided on the telescopic rod of the fixed control electric cylinder 29. A pushing seat 31 is provided on the fixed mounting frame 30. A telescopic fixed rod 32 is telescopically arranged on the detection cylinder 8. A second spring 33 is connected between the telescopic fixed rod 32 and the detection cylinder 8. The telescopic fixed rod 32 is pushed by the pushing seat 31. Fixing holes are formed on the circumferences of the filter plate 35 and the bottom plate 36, and the fixing holes cooperate with the telescopic fixed rod 32 to achieve fixation.

[0031] The scraping mechanism includes a scraping motor 24 arranged inside the lifting seat 10, and a mounting ring 23 rotatably arranged on the lifting seat 10. A connecting frame 25 is provided on the output shaft of the scraping motor 24. The connecting frame 25 is connected to the mounting ring 23. A scraping frame is connected to the connecting frame 25. The scraping frame is composed of a first scraping portion 26, a third scraping portion 28 and a second scraping portion 27. The second scraping portion 27 is located between the first scraping portion 26 and the third scraping portion 28.

[0032] Operating principle: The viscous oil is separately put into the detection cylinder 8 for multiple detections; specifically, when the viscous oil is put in, it is filtered through the filter plate 35 to remove impurities in the viscous oil; when putting in, the rotor mechanism in the target direction can be driven by the driving mechanism, that is, the engaging part 16 is engaged with the engaging groove on the sliding seat 18 to achieve driving, and the fixed control cylinder 29 controls the movement of the fixed mounting frame 30, the pushing seat 31 releases the pushing and extrusion of the telescopic fixed rod 32, and the telescopic fixed rod 32 extends outwards, that is, the fixation of the filter plate 35 is released; further, the electromagnetic telescopic push rod 43 extends outwards, that is, the radial control cylinder 38 controls the movement of the pushing mounting plate 42 and the sphere 39, the electromagnetic telescopic push rod 43 pushes the contact plate 45, that is, the fixed seat 44 moves and supports and fixes the filter plate 35 from the inner side of the filter plate 35, and the sphere 39 pushes the stirring shaft 40, so that the stirring shaft 40 extends outwards, that is, extends and protrudes outside the rotor cylinder 34. By driving the rotation of the rotor cylinder 34, the filter plate 35 can be driven to rotate, so that each area of the filter plate 35 filters the viscous oil, and the viscous oil is mixed through the stirring shaft 40. Further, through the action of the heating wire in the sphere 39, the viscous oil is preheated; when stirring the viscous oil alone, the electromagnetic telescopic push rod 43 retracts to the inside, that is, it does not push the contact plate 45.

[0033] It should be noted that in subsequent detections, that is, the fluid viscosity is measured through the rotational movement of the rotor mechanism. The rotor is equipped with a sensor to measure the torque on the rotor. By measuring the torque value of the rotor, the viscosity value of the liquid can be calculated; specifically, by driving the rotation of the rotor cylinder 34, the rotor cylinder 34 rotates alone at this time, without driving the filter plate 35 and the bottom plate 36 to rotate, and the end face of the stirring shaft 40 forms a smooth surface with the rotor cylinder 34.

[0034] In all directions, the indexing motor 6 controls the rotation of the indexing seat 11, that is, changes the orientation of the driving motor 15 to drive the rotor mechanisms in different orientations to achieve multiple detections; after the detection operation is completed, the motor 1 works, the lead screw 1 rotates, and the lifting seat 10 moves upwards, and then the rotor cylinder 34 moves upwards, that is, it disengages from the inside of the detection cylinder 8, which is convenient for inspecting the surface of the rotor; further, the contact plate 45 can be pushed to make the fixed seat 44 support and fix the filter plate 35 and the bottom plate 36 to drive the filter plate 35 and the bottom plate 36 to disengage from the inside of the detection cylinder 8 together. The bottom plate 36 is located at the bottom of the detection cylinder 8 and can contact the inner wall of the detection cylinder 8 to scrape off the residual attached viscous oil. Then, the control cylinder 22 controls the movement of the control plate 21, and under the connection action of the connecting rod 19, the sliding seat 18 moves radially, that is, the rotor cylinder 34, the filter plate 35 and the bottom plate 36 move radially. At this time, the driving mechanism cooperates with any one of the rotor mechanisms, and then the telescopic frame 12 moves radially following the sliding seat 18.

[0035] After the radial movement, the connecting gear 37 meshes with the gear ring 20, and the filter plate 35 and the bottom plate 36 are respectively located inside the first scraping part 26 and the third scraping part 28. The circumferential area of the rotor cylinder 34 between the filter plate 35 and the bottom plate 36 contacts the second scraping part 27, which can drive the rotation of the rotor mechanism, that is, the rotor cylinder 34 rotates. Under the driving action of the gear ring 20, the linkage of each rotor mechanism is realized. The residual heavy oil on the filter plate 35 and the bottom plate 36 is scraped off by the first scraping part 26 and the third scraping part 28, and the residual heavy oil on the circumference of the rotor cylinder 34 is scraped off by the second scraping part 27. Further, the connecting frame 25 can be driven to rotate by the scraping motor 24, which can drive the first scraping part 26, the second scraping part 27 and the third scraping part 28 to rotate. The first scraping part 26 and the third scraping part 28 respectively perform arc-shaped sweeping movements on the filter plate 35 and the bottom plate 36 to scrape off the heavy oil. Then each rotor mechanism is re-assembled into the detection cylinder 8.

Claims

1. A viscous oil viscosity measuring device, comprising a base (1), a collection cylinder (7) is arranged on the base (1), detection cylinders (8) are arranged in an array on the base (1), and an oil discharge valve (9) is arranged on the detection cylinder (8); characterized in that: A lifting mechanism is arranged on the base (1). The lifting mechanism includes a lifting seat (10). A rotor mechanism is slidably and arrayedly arranged on the lifting seat (10). A radial stirring mechanism and a fixing mechanism are arranged inside the rotor mechanism. A filter plate (35) and a bottom plate (36) are arranged inside the detection cylinder (8), and a clamping mechanism is arranged on the detection cylinder (8) for fixing the filter plate (35) and the bottom plate (36). A scraping mechanism is arranged at the bottom end of the lifting seat (10) for scraping the filter plate (35) and the bottom plate (36). An installation frame (5) is connected to the lifting seat (10), and a driving mechanism is arranged on the installation frame (5) for driving each rotor mechanism.

2. The heavy oil viscosity measuring device according to claim 1, characterized in that: The lifting mechanism includes a first motor (2), a first lead screw (3) and a first guide rod (4) arranged on the base (1). The first motor (2) is used to drive the first lead screw (3). The lifting seat (10) is movably arranged on the first lead screw (3) and the first guide rod (4), and the lifting seat (10) forms a screw pair with the first lead screw (3). An installation rod (17) is arranged on the lifting seat (10). The rotor mechanism is slidably arranged on the installation rod (17). A control electric cylinder (22) is arranged inside the lifting seat (10). A control board (21) is arranged on the telescopic rod of the control electric cylinder (22). The control board (21) is used to control the movement of the rotor mechanism. A gear ring (20) is rotatably installed on the lifting seat (10). The gear ring (20) meshes with the rotor mechanism for linkage.

3. The heavy oil viscosity measuring device according to claim 2, characterized in that: The rotor mechanism includes a sliding seat (18) slidably installed on the installation rod (17). A rotor cylinder (34) is rotatably installed on the sliding seat (18). A connecting gear (37) is arranged at the top end of the rotor cylinder (34). The connecting gear (37) meshes with the gear ring (20) for linkage. A matching groove is formed on the sliding seat (18). The matching groove cooperates with the driving mechanism for driving. A connecting rod (19) is rotatably installed on the sliding seat (18). One end of the connecting rod (19) is rotatably connected to the control board (21). The stirring mechanism and the fixing mechanism are arranged inside the rotor cylinder (34).

4. A heavy oil viscosity measuring device according to claim 3, characterized in that: The driving mechanism includes a indexing motor (6) arranged on the installation frame (5). A indexing seat (11) is arranged on the telescopic rod of the indexing motor (6). A telescopic frame (12) is telescopically arranged on the indexing seat (11). A first spring (13) is connected between the telescopic frame (12) and the indexing seat (11). A position oil cylinder (14) is arranged at one end of the telescopic frame (12). A driving motor (15) is arranged on the telescopic rod of the position oil cylinder (14). A matching part (16) is arranged on the output shaft of the driving motor (15). The matching part (16) cooperates with the matching groove on the sliding seat (18) for driving.

5. The heavy oil viscosity measuring device according to claim 3, characterized in that: The stirring mechanism includes a radially controlled electric cylinder (38) disposed inside the rotor cylinder (34). A sphere (39) is provided on the telescopic rod of the radially controlled electric cylinder (38). An electric heating wire is provided inside the sphere (39) for preheating. A stirring shaft (40) is radially telescopically arranged on the rotor cylinder (34). One end of the stirring shaft (40) facing the wall surface of the rotor cylinder (34) forms a smooth surface with the rotor cylinder (34), and a third spring (41) is connected between the stirring shaft (40) and the inner wall of the rotor cylinder (34). The stirring shaft (40) is pushed by the sphere (39).

6. The heavy oil viscosity measuring device according to claim 5, characterized in that: A pushing mounting plate (42) is provided on the telescopic rod of the radially controlled electric cylinder (38). An electromagnetic telescopic push rod (43) is provided on the pushing mounting plate (42) for controlling the movement of the fixing mechanism.

7. The heavy oil viscosity measuring device according to claim 6, characterized in that: The fixing mechanism includes a fixing seat (44) telescopically arranged on the rotor cylinder (34). A fourth spring (46) is connected between the fixing seat (44) and the wall surface of the rotor cylinder (34). A contact plate (45) is provided on the fixing seat (44), and the contact plate (45) is pushed by the electromagnetic telescopic push rod (43).

8. The viscosity measuring device for heavy oil according to claim 1, wherein: The clamping mechanism includes a fixed control electric cylinder (29) provided on the detection cylinder (8). A fixed mounting frame (30) is provided on the telescopic rod of the fixed control electric cylinder (29). A pushing seat (31) is provided on the fixed mounting frame (30). A telescopic fixed rod (32) is telescopically arranged on the detection cylinder (8). A second spring (33) is connected between the telescopic fixed rod (32) and the detection cylinder (8). The telescopic fixed rod (32) is pushed by the pushing seat (31). Fixing holes are formed on the circumferences of the filter plate (35) and the bottom plate (36), and the fixing holes cooperate with the telescopic fixed rod (32) to achieve fixation.

9. The heavy oil viscosity measuring device according to claim 1, wherein: The scraping mechanism includes a scraping motor (24) disposed inside the lifting seat (10), and a mounting ring (23) rotatably arranged on the lifting seat (10). A connecting frame (25) is provided on the output shaft of the scraping motor (24). The connecting frame (25) is connected to the mounting ring (23). A scraping frame is connected to the connecting frame (25). The scraping frame is composed of a first scraping part (26), a third scraping part (28), and a second scraping part (27). The second scraping part (27) is located between the first scraping part (26) and the third scraping part (28).

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