Geological stratified sampling device for geological prospecting

Abstract

The utility model relates to the technical field of geological sample sampling devices, and discloses a geological stratified sampling device for geological mining, which comprises a movable base provided with a central hole, and a limiting ring rotatably connected in the central hole; the sampling barrel selectively penetrates through the central hole; the telescopic sleeves are sequentially connected in a sliding mode from the outer side to the inner side in the vertical direction, the telescopic sleeve on the outermost side is connected with the inner side wall of the limiting ring in a sliding mode, the inner side wall of the telescopic sleeve on the innermost side is connected with the sampling barrel in a sliding mode, and the sampling barrel can drive the telescopic sleeve on the innermost side to synchronously move downwards. And then the multiple sections of telescopic sleeves from the inner side to the outer side are driven to be sequentially embedded in the drill hole. The sampling barrel can drive the telescopic sleeve on the innermost side to synchronously move downwards, then the multiple sections of telescopic sleeves are driven to be sequentially embedded in a drill hole, collapse of the drill hole is avoided, and layered multi-time sampling of stratums with different depths is achieved.

Description

A geological stratification sampling device for mineral exploration Technical Field

[0001] This utility model relates to the technical field of geological sample sampling devices, and in particular to a geological stratification sampling device for geological prospecting. Background Technology

[0002] In the field of geological prospecting, geological stratification sampling devices are key tools for obtaining samples of underground rocks, soil, and other materials. They are widely used in numerous scenarios, including mineral resource exploration, geological structure research, and environmental geological assessment. By accurately sampling strata at different depths, geologists can analyze the composition, structure, and mineralization potential of formations, providing scientific evidence for mining operations and geological disaster prevention. With the rapid development of the global economy and the continuously increasing demand for mineral resources, as well as the ever-advancing requirements for geological exploration precision, the market prospects for geological stratification sampling devices are becoming increasingly broad.

[0003] Taking patent document CN217765579U, entitled "A Soil Sampling Device," as an example, the soil sampling device of this patent mainly consists of a main rod, a circular plate, two joined semi-circular collecting cylinders, and a limiting mechanism. Its innovation lies in the fact that the collecting cylinders can be opened by the two semi-circular cylinders around a hinge, facilitating the removal of soil samples and minimizing damage to the integrity of the samples. However, its application in the field of geological prospecting still has many limitations. First, the collecting cylinders are formed by joining two semi-circular cylinders open at both ends. In actual soil sampling, the lower end of the semi-circular cylinders lacks a limiting structure, making it prone to deformation and cracking under soil pressure or drilling resistance, leading to device damage, affecting the continuity and reliability of sampling operations, and increasing equipment maintenance costs. Second, the device lacks a protective casing structure. When encountering loose or weak strata during geological drilling, the borehole is prone to collapse, making it impossible to achieve multi-layered sampling at different depths, hindering the efficient acquisition of representative multi-layered samples, and limiting the comprehensive understanding of deep geological information.

[0004] Given the shortcomings of the existing technology, it is particularly urgent to develop an improved geological stratification sampling device for geological prospecting. Summary of the Invention

[0005] The present invention aims to provide a geological stratification sampling device for geological prospecting to overcome the shortcomings mentioned above.

[0006] In order to achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A geological stratification sampling device for mineral exploration includes:

[0008] A movable base with a central hole, wherein a limit ring is rotatably connected within the central hole;

[0009] A sampling tube selectively penetrating the central hole; and

[0010] Multiple telescopic sleeves are connected in sequence from the outside to the inside in a vertical direction. The outermost telescopic sleeve is slidably connected to the inner wall of the limiting ring, and the innermost telescopic sleeve is slidably connected to the sampling cylinder. The sampling cylinder can drive the innermost telescopic sleeve to move downward synchronously, thereby driving the multiple telescopic sleeves from the inside to the outside to be embedded in the borehole in sequence.

[0011] Furthermore, the innermost telescopic sleeve has a plurality of first sliding grooves arranged vertically on its inner sidewall, and a stop surface is provided at the bottom of the first sliding groove. The sampling tube has a plurality of first sliding protrusions on its outer sidewall. The first sliding protrusions are slidably connected to the first sliding grooves and selectively abut against the stop surface.

[0012] Furthermore, one of the sidewalls of the two adjacent telescopic sleeves is provided with a second sliding protrusion, and the other is provided with a second sliding groove. The bottom of the second sliding groove is provided with a first stop. The second sliding protrusion is slidably connected to the second sliding groove and selectively abuts against the first stop.

[0013] Furthermore, one of the inner sidewall of the limiting ring and the outer sidewall of the outermost telescopic sleeve is provided with a third sliding protrusion, and the other is provided with a third sliding groove. The third sliding protrusion and the third sliding groove are slidably connected. The upper and lower ends of the outer sidewall of the outermost telescopic sleeve are provided with second retaining edges, and the limiting ring selectively abuts against the second retaining edges.

[0014] Furthermore, the sampling tube includes:

[0015] Force-applying rod;

[0016] A support plate fixedly connected to the lower end of the force-applying rod; and

[0017] Two arc plates are hinged to the support plate at their upper ends. The two arc plates can switch between a first state and a second state. In the first state, the two arc plates abut against each other and are assembled with the support plate to form a downward-opening cylindrical structure. In the second state, the two arc plates flip along their upper hinge point and move away from each other. The lower end of the arc plate is integrally formed with a cutting tooth. The cutting tooth can penetrate the lower end of the innermost telescopic sleeve. Multiple first sliding protrusions are fixedly connected to the outer wall of the arc plate.

[0018] Furthermore, the sampling cylinder also includes a driving component for driving the two arc plates to switch between the first state and the second state.

[0019] Furthermore, the driving component includes:

[0020] An operating ring is slidably connected to the outer wall of the force-applying rod, and a first connecting lug is fixedly connected to the operating ring;

[0021] A second connecting lug hinged to the upper end of the arc plate;

[0022] A connecting rod, the two ends of which are rotatably connected to the first connecting lug and the second connecting lug, respectively, and the first connecting lug, the second connecting lug, the connecting rod, and the arc plate are respectively provided in a one-to-one correspondence; and

[0023] The positioning ring, located below the operating ring and fixedly connected to the outer wall of the force-applying rod, abuts against the operating ring in the first state.

[0024] Furthermore, the force-applying rod comprises multiple rod segments that are detachably connected in a vertical direction. The top of the uppermost force-applying rod is vertically fixed to the middle of an operating rod, and anti-slip sleeves are installed at both ends of the operating rod.

[0025] Furthermore, the outer ring of the bearing is fixedly connected to the central hole, the inner ring of the bearing is fixedly connected to the limiting ring, and a universal wheel with a brake is installed on the lower surface of the movable base.

[0026] Furthermore, a storage rail is fixedly connected to the lower surface of the movable base. The storage rail is arranged opposite to the central hole and is detachably connected to a storage plate. The upper surface of the storage plate selectively abuts against the lower end of the telescopic sleeve.

[0027] Compared with the prior art, this utility model has at least the following advantages:

[0028] The sampling tube can drive the innermost telescopic sleeve to move downwards synchronously, thereby driving multiple telescopic sleeves to be embedded in the borehole in sequence, preventing the borehole from collapsing. This enables layered and multiple sampling of strata at different depths, resulting in more representative samples. This provides more comprehensive and accurate geological information for geological prospecting, helping geologists to more accurately analyze the composition, structure, and mineralization potential of strata.

[0029] The combination of two arc plates and the driving component makes it easier to switch between the first and second states, making sample retrieval more convenient and faster without the need for other tools, thus improving sampling efficiency.

[0030] During the sampling process, the outer wall of the arc plate is slidably connected to the inner wall of the innermost telescopic sleeve. Due to the constraint of the telescopic sleeve, deformation and cracking during the sampling process can be effectively avoided. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 is a schematic diagram of the overall structure of the geological stratification sampling device for geological prospecting of this utility model.

[0033] Figure 2 is a schematic diagram of the overall structure of the geological stratification sampling device for geological prospecting of this utility model from another perspective.

[0034] Figure 3 is a cross-sectional view of the geological stratification sampling device for geological prospecting of this utility model;

[0035] Figure 4 is a schematic diagram of the sampling tube of this utility model;

[0036] Figure 5 is a schematic diagram of the innermost telescopic sleeve of this utility model;

[0037] Figure 6 is a schematic diagram of the outermost telescopic sleeve of this utility model;

[0038] Figure 7 is a schematic diagram of the limiting ring of this utility model.

[0039] Reference numerals: 1. Movable base; 2. Bearing; 3. Limiting ring; 4. Telescopic sleeve; 5. First sliding groove; 6. Stop surface; 7. First sliding protrusion; 8. Second sliding protrusion; 9. Second sliding groove; 10. First stop edge; 11. Third sliding protrusion; 12. Third sliding groove; 13. Second stop edge; 14. Force rod; 15. Support plate; 16. Arc plate; 17. Cutting tooth; 18. Operating ring; 19. First connecting ear; 20. Second connecting ear; 21. Connecting rod; 22. Positioning ring; 23. Operating rod; 24. Anti-slip sleeve; 25. Storage rail; 26. Storage plate; 27. Caster wheel. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Referring to Figures 1-3, this utility model provides a geological stratification sampling device for geological prospecting, which mainly consists of a movable base 1, a sampling cylinder, a limiting ring 3, and a multi-section telescopic sleeve 4.

[0043] The movable base 1 provides support and mobility for the entire device. The movable base 1 has a square or circular plate-like structure, with a universal wheel 27 equipped with a brake at each of its four corners on its lower surface. This facilitates flexible movement of the device across different geological terrains and allows the base to be fixed in position by braking upon reaching the designated sampling location. A central hole is provided at the center of the movable base 1. The outer ring of the bearing 2 is fixedly connected to the inner wall of the central hole, while the inner ring of the bearing 2 is fixedly connected to the limiting ring 3. This ensures stable rotation of the limiting ring 3 within the central hole, while maintaining low friction and high precision during rotation. This design facilitates the subsequent screwing of the sampling cylinder by operators. During the screwing of the sampling cylinder, the telescopic sleeve 4 and the limiting ring 3 will rotate synchronously.

[0044] In addition, a storage rail 25 is fixedly connected to the lower surface of the movable base 1. The storage rail 25 is positioned opposite to the center hole and is detachably connected to a storage plate 26. The upper surface of the storage plate 26 selectively abuts against the lower end of the telescopic sleeve 4. When in storage mode, all telescopic sleeves 4 are lifted upwards, the storage plate 26 is installed on the storage rail 25, and then the telescopic sleeves 4 are released so that they abut against the top of the storage plate 26, thus completing the storage process and facilitating transportation. When in working mode, the center hole is aligned with the sampling position, and then the storage plate 26 is pulled out from the storage rail 25. The telescopic sleeves 4 will abut against the ground under their own weight, at which point sampling can be carried out.

[0045] Referring to Figure 7, the limiting ring 3 has a circular structure with a third sliding groove 12 on its inner sidewall, which is slidably connected to the third sliding protrusion 11 on the outermost telescopic sleeve 4. The upper and lower ends of the outermost telescopic sleeve 4 are provided with second stops 13. The vertical movement of the limiting ring 3 is restricted by the second stops 13. When the outermost telescopic sleeve 4 moves downward until the limiting ring 3 abuts against the upper second stop 13, it prevents the telescopic sleeve 4 from excessively disengaging from the limiting ring 3. Similarly, when the outermost telescopic sleeve 4 moves upward until the limiting ring 3 abuts against the lower second stop 13, it restricts the upward movement of the telescopic sleeve 4, thereby effectively limiting the range of motion of the telescopic sleeve 4 in the vertical direction.

[0046] Referring to Figures 5-6, the telescopic sleeve 4 is composed of multiple sections that are sequentially slidably connected in the vertical direction. The outermost telescopic sleeve 4's outer wall is slidably connected to the inner wall of the limiting ring 3, ensuring that the telescopic sleeve 4 can slide up and down within the limiting ring 3 without radial displacement. The side walls of each adjacent telescopic sleeve 4 are connected by mutually cooperating second sliding protrusions 8 and second sliding grooves 9. The bottom of the second sliding groove 9 is provided with a first stop 10. In this invention, the inner wall of the outermost telescopic sleeve 4 of two adjacent telescopic sleeves 4 is provided with a second sliding groove 9, and the outer wall of the innermost telescopic sleeve 4 is provided with a second sliding protrusion 8. When the innermost telescopic sleeve 4 slides downward, the second sliding protrusion 8 slides along the second sliding groove 9 until it abuts against the first stop 10. The first stop 10 prevents the telescopic sleeves 4 from separating during sliding. The innermost telescopic sleeve 4 has multiple first sliding grooves 5 arranged vertically on its inner wall, and the bottom of the first sliding grooves 5 is equipped with a stop surface 6. Multiple first sliding protrusions 7 on the outer wall of the sampling tube are slidably connected to the first sliding grooves 5 and abut against the stop surface 6 when needed, so as to achieve precise control of the downward position of the sampling tube.

[0047] Referring to Figure 4, the sampling tube is the core component for obtaining geological samples, including a force-applying rod 14, a support plate 15, two arc-shaped plates 16, and a drive assembly. The force-applying rod 14 is composed of multiple sections that are sequentially detachable and connected vertically. This design allows for flexible adjustment of the length of the force-applying rod 14 according to the actual sampling depth. The top of the uppermost force-applying rod 14 is vertically fixed to the middle of the operating rod 23. Anti-slip sleeves 24 are installed at both ends of the operating rod 23 for easy gripping and application of pressure or lifting force by the operator. The support plate 15 is fixedly connected to the lower end of the lowermost force-applying rod 14 and is a horizontally placed circular plate. It serves as an intermediate transition component connecting the force-applying rod 14 and the arc-shaped plates 16, providing stable support for the arc-shaped plates 16. The upper ends of the two arc-shaped plates 16 are hinged to the support plate 15 and can rotate within a certain angle range around the hinge point, thereby switching between a first state and a second state. In the first state, the two arc-shaped plates 16 abut against each other, forming a downward-opening cylindrical structure together with the support plate 15, creating a complete sampling space. The lower end of each arc-shaped plate 16 is integrally formed with cutting teeth 17, arranged in a serrated pattern, capable of penetrating the lower end of the innermost telescopic sleeve 4 and cutting into the soil or rock strata for precise sampling. Multiple first sliding protrusions 7 are fixedly connected to the outer wall of the arc-shaped plates 16, cooperating with the first sliding grooves 5 on the inner wall of the innermost telescopic sleeve 4 to achieve a stable connection and synchronous movement between the sampling cylinder and the telescopic sleeve 4. In the second state, the two arc-shaped plates 16 rotate away from each other along their upper hinge points to facilitate sample removal.

[0048] How to use the sampling device of this utility model:

[0049] The first step involves moving the movable base 1 to a suitable position based on the topography and sampling point location at the geological prospecting site. The casters 27 are then secured with brakes to ensure stability. Next, based on the expected sampling depth, an appropriate number of individual rods are selected. Initially, the force-applying rod 14 is kept at its shortest length to facilitate sampling near the ground. The operating ring 18 is positioned above the positioning ring 22, placing the sampling cylinder in its first state (closed). At this point, the arc plates 16 abut against each other, forming a cylindrical structure. The storage plate 26 is then pulled out from the storage rail 25, allowing the telescopic sleeve 4 to rest against the ground under its own weight, enabling sampling operations to commence.

[0050] In the second step, the operator holds the anti-slip sleeves 24 at both ends of the operating rod 23 with both hands, applies downward pressure, and simultaneously rotates the rod. The pressure is transmitted to the sampling tube through the force rod 14, causing the entire sampling tube to move downward. Simultaneously, the first sliding protrusion 7 is embedded in the first sliding groove 5, and the cutting teeth 17 pass through the telescopic sleeve 4. Under the pressure, the innermost telescopic sleeve 4 rotates and moves downward synchronously under the drive of the sampling tube, which in turn drives multiple telescopic sleeves 4 from the inside to the outside to be sequentially embedded in the borehole. As the sampling tube continues to move downward, the cutting teeth 17 at its lower end cut into the soil or rock strata, achieving single sampling. When the sampling tube reaches the predetermined depth, the pressure is stopped, and the tube remains stationary for a period of time to allow the sample inside the sampling tube to fully stabilize.

[0051] Third, slowly pull the operating rod 23 upwards to move the entire sampling cylinder upwards. At this time, the first sliding protrusion 7 slides along the first sliding groove 5, continuing to extract the sampling cylinder until it separates from the telescopic sleeve 4. Then, slide the operating ring 18 upwards, and through the connecting rod 21, drive the arc plate 16 to rotate around its upper hinge point and move away from each other, so that the sampling cylinder switches from the first state to the second state. The arc plate 16 opens, and the sample is taken out.

[0052] Fourth, repeat steps two and three to achieve sampling at different depths. Depending on the sampling depth, the length of the force-applying rod 14 should be increased by adding more individual rods.

[0053] Finally, retract each section of the telescopic sleeve 4 in sequence, lift all the telescopic sleeves 4 upwards, install the storage plate 26 on the storage rail 25, and then release the telescopic sleeves 4 so that they abut against the storage plate 26, returning them to their initial state, ready for the next sampling operation.

[0054] In a preferred embodiment of this invention, to facilitate the retrieval of each telescopic sleeve 4 after sampling, connecting rings (not shown in the figure) can be fixedly installed on the outermost telescopic sleeve 4 and the innermost telescopic sleeve 4. The two connecting rings are connected by a traction rope (not shown in the figure), preferably made of steel wire rope. After sampling, the outermost telescopic sleeve 4 is lifted to the ground, and the innermost telescopic sleeve 4 is pulled upwards using the traction rope to achieve the retrieval process of each telescopic sleeve 4.

[0055] It should be understood that, since the sampling device of this utility model is operated manually, the sampling depth should not be too deep, preferably 1-2 meters. The telescopic sleeve 4 is made of 2-3 sections, and the height of each section does not exceed 1 meter.

[0056] The beneficial effects of this utility model are as follows:

[0057] The sampling tube can drive the innermost telescopic sleeve 4 to move downward synchronously, thereby driving multiple telescopic sleeves 4 to be embedded in the borehole in sequence, avoiding borehole collapse, realizing layered and multiple sampling of strata at different depths, and obtaining samples with better representativeness, providing more comprehensive and accurate geological information for geological prospecting, and helping geologists to more accurately analyze the composition, structure and mineral potential of strata.

[0058] The combination of the two arc plates 16 and the driving component makes it easier to switch between the first and second states, making sample retrieval more convenient and faster without the need for other tools, thus improving sampling efficiency.

[0059] During the sampling process, the outer wall of the arc plate 16 is slidably connected to the inner wall of the innermost telescopic sleeve 4. Due to the constraint of the telescopic sleeve 4, deformation and cracking during the sampling process can be effectively avoided.

[0060] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0061] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A geological stratification sampling device for mineral exploration, characterized in that, include: A movable base (1) with a central hole is provided, and a limiting ring (3) is rotatably connected inside the central hole; a sampling tube is selectively inserted through the central hole; and multiple telescopic sleeves (4) are sequentially connected from the outside to the inside in the vertical direction. The outermost telescopic sleeve (4) is slidably connected to the inner wall of the limiting ring (3), and the innermost telescopic sleeve (4) is slidably connected to the sampling tube. The sampling tube can drive the innermost telescopic sleeve (4) to move downward synchronously, thereby driving the multiple telescopic sleeves (4) from the inside to the outside to be sequentially embedded in the borehole.

2. The geological stratification sampling device for mineral exploration according to claim 1, characterized in that, The innermost telescopic sleeve (4) has multiple first sliding grooves (5) arranged vertically on its inner wall. The bottom of the first sliding groove (5) has a stop surface (6). The outer wall of the sampling tube has multiple first sliding protrusions (7). The first sliding protrusions (7) are slidably connected to the first sliding groove (5) and selectively abut against the stop surface (6).

3. The geological stratification sampling device for mineral exploration according to claim 2, characterized in that, One of the sidewalls of the two adjacent telescopic sleeves (4) is provided with a second sliding protrusion (8), and the other is provided with a second sliding groove (9). The bottom of the second sliding groove (9) is provided with a first stop (10). The second sliding protrusion (8) is slidably connected to the second sliding groove (9) and selectively abuts against the first stop (10).

4. The geological stratification sampling device for mineral exploration according to claim 3, characterized in that, The inner wall of the limiting ring (3) and the outer wall of the outermost telescopic sleeve (4) are provided with a third sliding protrusion (11) and the other is provided with a third sliding groove (12). The third sliding protrusion (11) and the third sliding groove (12) are slidably connected. The upper and lower ends of the outer wall of the outermost telescopic sleeve (4) are provided with second retaining edges (13). The limiting ring (3) is selectively abutted against the second retaining edges (13).

5. The geological stratification sampling device for mineral exploration according to claim 4, characterized in that, The sampling cylinder includes: a force-applying rod (14); a support plate (15) fixedly connected to the lower end of the force-applying rod (14); and two arc plates (16) hinged to the support plate (15) at their upper ends. The two arc plates (16) can switch between a first state and a second state. In the first state, the two arc plates (16) abut against each other and are assembled with the support plate (15) to form a cylindrical structure with the opening facing downward. In the second state, the two arc plates (16) rotate away from each other along their upper hinge point. The lower end of the arc plate (16) is integrally formed with a cutting tooth (17). The cutting tooth (17) can penetrate the lower end of the innermost telescopic sleeve (4). The outer side wall of the arc plate (16) is fixedly connected with a plurality of the first sliding protrusions (7).

6. The geological stratification sampling device for mineral exploration according to claim 5, characterized in that, The sampling cylinder also includes a drive assembly for driving the two arc plates (16) to switch between the first state and the second state.

7. The geological stratification sampling device for mineral exploration according to claim 6, characterized in that, The drive assembly includes: an operating ring (18) slidably connected to the outer wall of the force-applying rod (14), with a first connecting ear (19) fixedly connected to the operating ring (18); a second connecting ear (20) hinged to the upper end of the arc plate (16); a connecting rod (21), with both ends of the connecting rod (21) rotatably connected to the first connecting ear (19) and the second connecting ear (20) respectively, and the first connecting ear (19), the second connecting ear (20), the connecting rod (21) and the arc plate (16) being arranged in a one-to-one correspondence; and a positioning ring (22) located below the operating ring (18) and fixedly connected to the outer wall of the force-applying rod (14), wherein in the first state, the operating ring (18) abuts against the positioning ring (22).

8. The geological stratification sampling device for mineral exploration according to claim 7, characterized in that, The force-applying rod (14) includes multiple rod units that are detachably connected in a vertical direction. The top of the uppermost force-applying rod (14) is vertically fixed to the middle of the operating rod (23), and anti-slip sleeves (24) are installed at both ends of the operating rod (23).

9. The geological stratification sampling device for mineral exploration according to any one of claims 1 to 8, characterized in that, The outer ring of the bearing (2) is fixedly connected to the central hole, the inner ring of the bearing (2) is fixedly connected to the limiting ring (3), and the lower surface of the movable base (1) is equipped with a universal wheel (27) with a brake.

10. The geological stratification sampling device for mineral exploration according to claim 9, characterized in that, The lower surface of the movable base (1) is fixedly connected to a storage rail (25), which is arranged opposite to the center hole and is detachably connected to a storage plate (26). The upper surface of the storage plate (26) selectively abuts against the lower end of the telescopic sleeve (4).

Images