High-resolution seismic wave imaging method and device

Abstract

According to the high-resolution seismic wave imaging method and device, on the premise that the modeling precision is improved, migration travel time errors are reduced, a one-way wave pre-stack depth Q migration technology is adopted for the first time based on a grid chromatography Q body establishment technology of structural constraints, the seismic resolution of shale oil thin layers is effectively improved, and the seismic resolution of the shale oil thin layers is improved. On the basis of high-precision grid velocity tomography, common imaging point gather frequency characteristics are picked up, Q tomography inversion is performed by using a peak value frequency shift method, fine establishment of a Q body is realized, a guide seat is mounted on a seismic wave imager, a guide rod can be mounted in the guide seat, two ends of the guide rod can be respectively connected with a bracket and a linkage rod, the linkage rod is connected to a foot stool, and the seismic wave imager is mounted on the foot stool. When the foot stool is pushed by the conical head to be opened, the guide rod can be pushed upwards, the guide rod can drive the support to move upwards, the support can push the solar panel, opening is achieved, the seismic wave imager can be rapidly placed when used, and rapid use is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of seismic wave detection, and in particular to a high-resolution seismic wave imaging method and device. Background Art

[0002] Seismic exploration is a geophysical exploration method that utilizes the differences in elasticity and density of underground media to infer the properties and morphology of underground rock formations by observing and analyzing the propagation patterns of seismic waves generated by artificial earthquakes underground. Among them, the above-mentioned method of analyzing the propagation patterns of seismic waves underground mainly involves imaging the seismic waves generated by artificial earthquakes and then analyzing the imaging results of the seismic waves.

[0003] The seismic wave imaging analysis devices currently on the market are divided into fixed and portable types. The portable seismic wave imaging analysis device can be carried with the staff when traveling. When in use, the tripod, solar panel and body of the device can be opened separately. However, this use process has many steps and cannot be quickly placed for use. Summary of the invention

[0004] One of the purposes of the present application is to provide a high-resolution seismic wave imaging method and device.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a high-resolution seismic wave imaging method, comprising the following steps:

[0006] Step 1: Use Levenberg-Marqurdt or iterative damped least-squares method to perform spectral inversion. By performing spectral inversion on the waveform of each record, the path attenuation t can be determined, and Q inversion imaging can be performed. Once t is determined and the velocity model is given, Q value inversion imaging can be performed;

[0007] Step 2: First, use the superposition spectrum ratio method (abbreviated as SSR method) to determine the Lg coda Q and n values ​​of each path. The SSR method jointly obtains the Lg coda Q and n values ​​of each path. Q is the Q value at 1 Hz, which is a coefficient related to frequency (Q = f"), and e is a random error, which mainly comes from the background noise of the seismic record, the window length effect and other factors. Applying linear regression to equation (1.25) can obtain the estimated values ​​of Q and n;

[0008] Step 3: Back-projection imaging. The observed value of a single-record Lg coda wave Q is the average value of the medium attenuation characteristics within an ellipse, and the source and receiving stations are located at the two foci of the ellipse respectively. The size of the ellipse is proportional to the duration of the coda wave. Assuming there are Nd records, and the Lg coda wave Q value and frequency-related factor n corresponding to each record have been calculated by the SSR method, the study area is then divided into several grid cells (denoted as Nc). In the mth grid cell, it is assumed that the Q value of the Lg coda wave is a constant, and S is the area covered by the nth ellipse in the mth grid, then there is coda wave Q value inversion imaging.

[0009] Another technical solution adopted in the present application is: a high-resolution seismic wave imaging device, including a seismic wave imager, a display and a solar panel, wherein the display is detachably connected to the four side end faces of the seismic wave imager, each side end face of the seismic wave imager is slidably connected with a guide rod, one end of the guide rod is connected to a bracket, the bracket is rotatably connected to the solar panel, the other end of the guide rod is slidably connected with a linkage rod, the linkage rod is rotatably connected to a tripod, the tripod is rotatably connected to a limit frame, the limit frame is provided with a conical head, the conical head is located on the inner side of the tripod, and a first spring is connected to one end face of the tripod.

[0010] Preferably, a guide seat is provided on the seismic wave imager, and the guide seat is installed along the length of the seismic wave imager. The interior of the guide seat is hollow, and a fixed seat is provided inside the guide seat. A guide rod is slidably connected to the fixed seat inside the guide seat, and the guide rod slides along the length of the guide seat. The guide rod is located in the middle of the fixed seat.

[0011] Preferably, a boss is provided on one end of the guide rod, the boss is vertically arranged on the guide rod, a transverse groove is provided on the boss, the transverse groove is opened along the length of the boss, one end of a linkage rod is slidably connected inside the transverse groove, a rotating rod is provided on the other end of the linkage rod, and the rotating rod is rotatably connected to the tripod.

[0012] Preferably, the limit frame is arranged in a frustum shape as a whole, the middle part of the limit frame is threadedly connected to a screw rod, the screw rod is respectively located on both sides of the limit frame, a conical head is arranged on the outer end of the screw rod, a connecting rod is arranged on the conical head, the connecting rod is vertically arranged on the conical head, and a knob is arranged on the connecting rod.

[0013] Preferably, a sliding rod is provided on the end of the screw rod inside the limiting frame, the sliding rod has the same diameter as the screw rod, a top rod is provided on the seismic wave imager corresponding to the sliding rod, and the sliding rod is slidably connected to the top rod.

[0014] Preferably, the diameter of the sliding rod is larger than the diameter of the push rod, the push rod at one end of the sliding rod is sleeved with a second spring, an inclined plate is provided on the side edge limit frame of the sliding rod, a first spring is installed between the inclined plate and the tripod, and a push head is provided on the end face of the tripod facing the conical head, and the push head is arranged in the moving direction of the conical head.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] This scheme establishes the idea of ​​multi-information fusion "real surface" full-depth high-precision velocity modeling. On the basis of integrating the near-surface velocity model, a simulated surface offset surface is constructed. On the premise of improving modeling accuracy, the offset travel time error is reduced. The grid tomography Q-body establishment technology based on structural constraints uses the single-way wave pre-stack depth Q migration technology for the first time to effectively improve the seismic resolution of shale oil thin layers. On the basis of high-precision grid velocity tomography, the frequency characteristics of the common imaging point gathers are picked up, and the peak frequency shift method is used for Q tomography inversion to achieve the fine establishment of the Q body.

[0017] The scheme arranges a guide seat on the seismic wave imager, and a guide rod can be installed in the guide seat. The guide rod can slide along the guide seat, one end of the guide rod is connected to the bracket, and the other end of the guide rod is connected to the convex seat. When the guide rod moves up, it will drive the bracket to push the solar panel, and the solar energy will be deployed, otherwise it will be stored. A transverse groove is provided on the convex seat, and a linkage rod is connected in the transverse groove. The linkage rod is rotatably connected to the tripod. When the tripod is deployed, it can drive the linkage rod to push the guide rod, and the guide rod will move up, thereby realizing the deployment of the solar panel. When the tripod is stored, it will also drive the guide rod to move down, and the guide rod can drive the solar panel to be stored, thereby realizing the quick placement of the seismic wave imager and quick use.

[0018] The present invention provides a limit frame on the seismic wave imager, wherein the middle part of the limit frame is threadedly connected to a screw rod, one end of the screw rod is connected to a sliding rod, and the other end is connected to a conical head. The sliding rod is slidably connected to a top rod of the seismic wave imager, and a first spring is sleeved on the top rod. When the screw rod moves away from the limit frame, the first spring can push the screw rod as a whole, and the sliding rod will move along the limit frame. When the screw rod moves, the conical head can be driven to move, and the conical head will push the top head. After the top head is pushed by the conical head, it can rotate, and the tripod can be pushed and opened. A second spring is connected to the other end surface of the tripod, and the second spring is installed on the inclined plate. When the tripod is pushed by the conical head, the second spring will contract. The torsion force of the first spring is greater than the torsion force of the second spring, and the tripod will not be reset, thereby ensuring the stable deployment of the tripod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the present invention is schematically shown Figure 1 .

[0020] Figure 2 The structure of the present invention is schematically shown Figure 2 .

[0021] Figure 3 The structure of the present invention is schematically shown Figure 3 .

[0022] Figure 4 It is a schematic diagram of the enlarged structure of area A in the present invention.

[0023] Figure 5 It is a schematic diagram of the enlarged structure of area B in the present invention.

[0024] Figure 6 It is a schematic diagram of the enlarged structure of the C region in the present invention.

[0025] Figure 7 It is a schematic diagram of the enlarged structure of the D area in the present invention.

[0026] Figure 8 This is a modeling flow chart for the present invention.

[0027] Fig. 9 A flow chart is created for high resolution in the present invention.

[0028] In the figure: 1. seismic wave imager; 2. display; 3. solar panel; 4. tripod; 5. bracket; 6. guide seat; 7. fixing seat; 8. guide rod; 9. knob; 10. convex seat; 11. transverse groove; 12. linkage rod; 13. inclined plate; 14. first spring; 15. rotating rod; 16. limit frame; 17. top head; 18. connecting rod; 19. conical head; 20. screw rod; 21. sliding rod; 22. second spring; 23. top rod. DETAILED DESCRIPTION

[0029] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0032] Embodiment 1:

[0033] A high-resolution seismic wave imaging method of the present invention comprises the following steps:

[0034] Step 1: Use Levenberg-Marqurdt or iterative damped least-squares method to perform spectral inversion. By performing spectral inversion on the waveform of each record, the path attenuation t can be determined, and Q inversion imaging can be performed. Once t is determined and the velocity model is given, Q value inversion imaging can be performed;

[0035] Step 2: First, use the superposition spectrum ratio method (abbreviated as SSR method) to determine the Lg coda Q and n values ​​of each path. The SSR method jointly obtains the Lg coda Q and n values ​​of each path. Q is the Q value at 1 Hz, which is a coefficient related to frequency (Q = f"), and e is a random error, which mainly comes from the background noise of the seismic record, the window length effect and other factors. Applying linear regression to equation (1.25) can obtain the estimated values ​​of Q and n;

[0036] Step 3: Back-projection imaging. The observed value of a single-record Lg coda wave Q is the average value of the medium attenuation characteristics within an ellipse, and the source and receiving stations are located at the two foci of the ellipse respectively. The size of the ellipse is proportional to the duration of the coda wave. Assuming there are Nd records, and the Lg coda wave Q value and frequency-related factor n corresponding to each record have been calculated by the SSR method, the study area is then divided into several grid cells (denoted as Nc). In the mth grid cell, it is assumed that the Q value of the Lg coda wave is a constant, and S is the area covered by the nth ellipse in the mth grid, then there is coda wave Q value inversion imaging.

[0037] During implementation, this plan established a multi-information fusion "real surface" full-depth high-precision velocity modeling idea. On the basis of integrating the near-surface velocity model, a simulated surface offset surface was constructed. On the premise of improving modeling accuracy, the offset travel time error was reduced. The grid tomography Q-body establishment technology based on structural constraints used the single-way wave pre-stack depth Q migration technology for the first time to effectively improve the seismic resolution of shale oil thin layers. On the basis of high-precision grid velocity tomography, the frequency characteristics of the common imaging point gathers were picked up, and the peak frequency shift method was used for Q tomography inversion to achieve the fine establishment of the Q-body.

[0038] Embodiment 2:

[0039] like Figures 1 to 7As shown, a high-resolution seismic wave imaging device of the present invention comprises a seismic wave imager 1, a display 2 and a solar panel 3. The display 2 is detachably connected to the four side end faces of the seismic wave imager 1. A guide rod 8 is slidably connected to each side end face of the seismic wave imager 1. One end of the guide rod 8 is connected to a bracket 5. The bracket 5 is rotatably connected to the solar panel 3. The other end of the guide rod 8 is slidably connected to a linkage rod 12. The linkage rod 12 is rotatably connected to a tripod 4. The tripod 4 is rotatably connected to a limit frame 16. The limit frame 16 is provided with a conical head 19. The conical head 19 is provided with a conical head 19. The head 19 is located on the inner side of the tripod 4, and a first spring 14 is connected to one end surface of the tripod 4. By installing the guide seat 6 on the seismic wave imager 1, a guide rod 8 can be installed in the guide seat 6, and the guide rod 8 can be connected to the bracket 5 and the linkage rod 12 at both ends respectively. The linkage rod 12 is connected to the tripod 4. When the tripod 4 is pushed open by the conical head 19, the guide rod 8 will be pushed up, and the guide rod 8 can drive the bracket 5 to move up, and the bracket 5 can push the solar panel 3 to achieve opening. The seismic wave imager 1 can be quickly placed when in use, thereby achieving quick use.

[0040] As an optional solution, in this embodiment, if Figure 3 , Figure 4 and Figure 5 As shown, a guide seat 6 is provided on the seismic wave imager 1, and the guide seat 6 is installed along the length of the seismic wave imager 1. The guide seat 6 is hollow inside, and a fixed seat 7 is provided inside the guide seat 6. A guide rod 8 is slidably connected to the fixed seat 7 inside the guide seat 6, and the guide rod 8 slides along the length of the guide seat 6. The guide rod 8 is located in the middle of the fixed seat 7, and the guide seat 6 can be used to limit the guide rod 8, and the guide rod 8 can be movable in the guide seat 6. The stability of the guide rod 8 can be achieved by the fixed seat 7, thereby preventing the guide rod 8 from deflecting; a convex seat 10 is provided on one end of the guide rod 8, and the convex seat 10 is vertically arranged on the guide rod 8. A transverse groove 11 is provided on the convex seat 10, and the transverse groove 11 is opened along the length of the convex seat 10. One end of a linkage rod 12 is slidably connected inside the transverse groove 11, and a rotating Rod 15, the rotating rod 15 is rotatably connected to the tripod 4, and the transverse groove 11 can be opened through the convex seat 10, and the linkage rod 12 can be installed in the transverse groove 11, and the linkage rod 12 can move along the transverse groove 11. When the linkage rod 12 drives the guide rod 8 to move, there will be no limit, and the activities of the guide rod 8 and the linkage rod 12 will not limit each other; the limiting frame 16 is arranged in a frustum shape as a whole, and the middle part of the limiting frame 16 is threadedly connected to the screw rod 20, and the screw rod 20 is respectively located on both sides of the limiting frame 16. A conical head 19 is arranged on the outer end of the screw rod 20, and a connecting rod 18 is arranged on the conical head 19. The connecting rod 18 is vertically arranged on the conical head 19, and a knob 9 is arranged on the connecting rod 18. The screw 20 can be used to realize that the conical head 19 will not move again after being reset, thereby ensuring that the tripod 4 will not open after being stored.

[0041] As an optional solution, in this embodiment, if Figure 6 and Figure 7 As shown, a slide bar 21 is provided at the end of the screw rod 20 inside the limit frame 16. The slide bar 21 has the same diameter as the screw rod 20. A top rod 23 is provided on the seismic wave imaging device 1 corresponding to the slide bar 21. The slide bar 21 is slidably connected to the top rod 23. The slide bar 21 can be limited by the top rod 23, and the slide bar 21 can be telescopically rotated on the top rod 23. The diameter of the slide bar 21 is larger than the diameter of the top rod 23. The top rod 23 at one end of the slide bar 21 is sleeved with a second spring 22. An inclined plate 13 is provided on the side edge limit frame 16, and a first spring 14 is installed between the inclined plate 13 and the tripod 4. A top head 17 is provided on the end surface of the tripod 4 facing the conical head 19, and the top head 17 is arranged in the moving direction of the conical head 19. The tripod 4 can be pushed by the second spring 22, and the tripod 4 can be kept in the stored state. The conical head 19 can be driven by the setting of the first spring 14, and the conical head 19 can push the tripod 4, thereby realizing the opening of the tripod 4.

[0042] During implementation, when the tripod 4 is unfolded, the linkage rod 12 can be driven to push the guide rod 8, and the guide rod 8 will move up, thereby realizing the unfolding of the solar panel 3. When the tripod 4 is stored, the guide rod 8 will also be driven to move down, and the guide rod 8 can drive the solar panel 3 to be stored, thereby realizing the quick placement of the seismic wave imager 1, thereby realizing quick use; by arranging a limit frame 16 on the seismic wave imager 1, the middle part of the limit frame 16 is threadedly connected to the screw rod 20, one end of the screw rod 20 is connected to the slide rod 21, and the other end of the slide rod 21 is connected to the slide rod 21. The end is connected to the conical head 19, and the sliding rod 21 is slidably connected to the top rod 23 of the seismic wave imager 1. The first spring 14 is sleeved on the top rod 23. When the screw rod 20 is away from the limit frame 16, the first spring 14 can push the screw rod 20 as a whole, and the sliding rod 21 will move along the limit frame 16. When the screw rod 20 moves, it can drive the conical head 19 to move, and the conical head 19 will push the top head 17. After being pushed by the conical head 19, the top head 17 can rotate, and the tripod 4 can be pushed open.

[0043] The working principle of the present invention is as follows: by arranging a guide seat 6 on the seismic wave imager 1, a guide rod 8 can be installed in the guide seat 6, and the guide rod 8 can slide along the guide seat 6, one end of the guide rod 8 is connected to the bracket 5, and the other end of the guide rod 8 is connected to the convex seat 10, when the guide rod 8 moves up, it will drive the bracket 5 to push the solar panel 3, and the solar energy will be unfolded, otherwise it will be stored, a transverse groove 11 is provided on the convex seat 10, and a linkage rod 12 is connected in the transverse groove 11, and the linkage rod 12 is rotatably connected to the tripod 4, when the tripod 4 is unfolded, it can drive the linkage rod 12 to push the guide rod 8, and the guide rod 8 will move up, thereby realizing the unfolding of the solar panel 3, and when the tripod 4 is stored, it will also drive the guide rod 8 to move down, and the guide rod 8 can drive the solar panel 3 to be stored, thereby realizing the quick placement of the seismic wave imager 1, thereby realizing quick use; by arranging a limit frame 16 on the seismic wave imager 1, the middle of the limit frame 16 The screw rod 20 is threadedly connected to the upper part, one end of the screw rod 20 is connected to the sliding rod 21, and the other end is connected to the conical head 19. The sliding rod 21 is slidably connected to the top rod 23 of the seismic wave imager 1, and the first spring 14 is sleeved on the top rod 23. When the screw rod 20 is away from the limiting frame 16, the first spring 14 can push the screw rod 20 as a whole, and the sliding rod 21 will move along the limiting frame 16. When the screw rod 20 moves, the conical head 19 can drive the movement, and the conical head 19 will push the top head 17. After the top head 17 is pushed by the conical head 19, it can rotate, and the tripod 4 can be pushed and opened. A second spring 22 is connected to the other end surface of the tripod 4, and the second spring 22 is installed on the inclined plate 13. When the tripod 4 is pushed by the conical head 19, the second spring 22 will shrink. The torsion of the first spring 14 is greater than the torsion of the second spring 22, and the tripod 4 will not reset, thereby ensuring the stable deployment of the tripod 4.

[0044] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A high-resolution seismic wave imaging method, characterized in that: The following steps are involved: Step 1: Use Levenberg-Marqurdt or iterative damped least-squares method to perform spectral inversion. By performing spectral inversion on the waveform of each record, the path attenuation t can be determined, and Q inversion imaging can be performed. Once t is determined and the velocity model is given, Q value inversion imaging can be performed; Step 2: First, use the superposition spectral ratio method (SSR method for short) to determine the Lg coda wave Q and n values ​​of each path. The SSR method jointly obtains the Lg coda wave Q and n values ​​of each path. Q is the Q value at 1 Hz, which is a frequency-related coefficient (Q = "), and e is a random error, which mainly comes from the background noise of the seismic record, the window length effect and other factors. Applying linear regression to equation (1.25) can obtain the estimated values ​​of Q and n. Step 3: Back-projection imaging. The observed value of a single-record Lg coda wave Q is the average value of the medium attenuation characteristics within an ellipse, and the source and receiving stations are located at the two foci of the ellipse respectively. The size of the ellipse is proportional to the duration of the coda wave. Assuming there are Nd records, and the Lg coda wave Q value and frequency-related factor n corresponding to each record have been calculated by the SSR method, the study area is then divided into several grid cells (denoted as Nc). In the mth grid cell, it is assumed that the Q value of the Lg coda wave is a constant, and S is the area covered by the nth ellipse in the mth grid, then there is coda wave Q value inversion imaging.

2. A high-resolution seismic wave imaging device, comprising a seismic wave imager (1), a display (2) and a solar panel (3), characterized in that: The display (2) is detachably connected to the four side end faces of the seismic wave imager (1); each side end face of the seismic wave imager (1) is slidably connected to a guide rod (8); one end of the guide rod (8) is connected to a bracket (5); the bracket (5) is rotatably connected to the solar panel (3); the other end of the guide rod (8) is slidably connected to a linkage rod (12); the linkage rod (12) is rotatably connected to a tripod (4); the tripod (4) is rotatably connected to a limit frame (16); a conical head (19) is provided on the limit frame (16); the conical head (19) is located on the inner side of the tripod (4); and a first spring (14) is connected to one end face of the tripod (4).

3. A high-resolution seismic wave imaging device as claimed in claim 2, characterized in that: The seismic wave imager (1) is provided with a guide seat (6), the guide seat (6) is installed along the length direction of the seismic wave imager (1), the interior of the guide seat (6) is hollow, a fixed seat (7) is provided inside the guide seat (6), a guide rod (8) is slidably connected to the fixed seat (7) inside the guide seat (6), the guide rod (8) slides along the length direction of the guide seat (6), and the guide rod (8) is located in the middle of the fixed seat (7).

4. A high-resolution seismic wave imaging device as claimed in claim 2, characterized in that: A convex seat (10) is arranged on one end of the guide rod (8), the convex seat (10) is vertically arranged on the guide rod (8), a transverse groove (11) is arranged on the convex seat (10), the transverse groove (11) is opened along the length of the convex seat (10), one end of a linkage rod (12) is slidably connected inside the transverse groove (11), a rotating rod (15) is arranged on the other end of the linkage rod (12), and the rotating rod (15) is rotatably connected to the tripod (4).

5. A high-resolution seismic wave imaging device as claimed in claim 2, characterized in that: The limiting frame (16) is arranged in a cone shape as a whole. The middle part of the limiting frame (16) is threadedly connected to a screw rod (20). The screw rod (20) is respectively located on both sides of the limiting frame (16). A conical head (19) is arranged on the outer end of the screw rod (20). A connecting rod (18) is arranged on the conical head (19). The connecting rod (18) is vertically arranged on the conical head (19). A knob (9) is arranged on the connecting rod (18).

6. A high-resolution seismic wave imaging device as claimed in claim 2, characterized in that: A sliding rod (21) is arranged on the end of the screw rod (20) inside the limiting frame (16); the sliding rod (21) has the same diameter as the screw rod (20); a top rod (23) is arranged on the seismic wave imaging device (1) corresponding to the sliding rod (21); and the sliding rod (21) is slidably connected to the top rod (23).

7. A high-resolution seismic wave imaging device as claimed in claim 6, characterized in that: The diameter of the slide bar (21) is larger than the diameter of the push rod (23); the push rod (23) at one end of the slide bar (21) is sleeved with a second spring (22); a slanted plate (13) is arranged on the side edge limit frame (16) of the slide bar (21); a first spring (14) is arranged between the slanted plate (13) and the tripod (4); a push head (17) is arranged on the end surface of the tripod (4) facing the conical head (19); and the push head (17) is arranged in the moving direction of the conical head (19).

Images