Layered sampling device for soil detection sampling

Abstract

The invention discloses a stratified sampling device for soil detection sampling, and particularly relates to the field of soil sampling, the stratified sampling device comprises a positioning mechanism, a plurality of sampling mechanisms are arranged on the outer wall of the positioning mechanism, the positioning mechanism comprises a supporting type bottom frame, and each sampling mechanism comprises a limiting plate fixedly mounted on the outer wall of the supporting type bottom frame; a balance ring is fixedly installed on the horizontal center line of the limiting plate, a balance block is fixedly installed on the outer wall of the balance ring, adjusting rods are rotationally installed on the two sides of the balance block, threaded grooves are formed in the outer walls of the two adjusting rods, connecting sleeves are arranged on the outer walls of the two adjusting rods, and limiting type sliding sleeves are fixedly installed on one sides of the connecting sleeves. According to the invention, the plurality of sampling barrels capable of horizontally moving are annularly and sequentially arranged on the outer wall of the supporting type bottom frame at equal intervals, so that synchronous sampling can be synchronously carried out at different heights, synchronous multi-point sampling can be carried out at the same height, the sampling device is more convenient to use, and the working efficiency is more convenient to improve.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sampling, and more specifically, the present invention relates to a layered sampling device for soil detection sampling. Background Art

[0002] Soil sample preparation refers to the process that soil samples (disturbed during sampling) experience mixing, drying, grinding, and sieving after being collected from the field. Except for immediately analyzing the traits related to microbial activities, redox conditions, volatile substances, etc. (such as ferrous iron, reducible sulfur, easily reducible manganese, nitrate nitrogen, ammonium nitrogen, easily degradable and volatile organic compounds, etc.) of the fresh soil samples collected in the wild, the remaining samples need to be dried in time to inhibit the activities and chemical changes of soil microorganisms, make the obtained analysis results more stable, and also facilitate long-term preservation. The fresh samples should first remove the intrusions outside the soil (such as plant roots, insect corpses, bricks, stones, etc.) and neoformations (such as iron-manganese nodules and lime nodules, etc.), and then be dried as soon as possible.

[0003] Currently, when conducting layered sampling of soil, usually a deep pit is dug at the sampling point first, and then multiple sampling cylinders are successively inserted into the side wall of the deep pit at the same horizontal height. Then, the soil outside the deep pit is dug out, so that the sampling cylinders can fall from the side wall of the deep pit to obtain multiple soil samples at the same horizontal height. However, adopting this method, the overall process is complex, and when multiple layers of different soil samples are required, the digging process is relatively long, resulting in low work efficiency and inconvenience for actual use. Therefore, the present invention proposes a layered sampling device for soil detection sampling to solve the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a layered sampling device for soil detection sampling. By arranging a plurality of horizontally movable sampling cylinders at equal intervals in a circular shape on the outer wall of a support bottom frame, synchronous sampling can be carried out at different heights, and synchronous multi-point sampling can be carried out at the same height to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A layered sampling device for soil detection sampling, including a positioning mechanism, and a plurality of sampling mechanisms are arranged on the outer wall of the positioning mechanism; The positioning mechanism includes a support - type bottom frame. The sampling mechanism includes a limiting plate fixedly installed on the outer wall of the support - type bottom frame. A balance ring is fixedly installed on the horizontal center line of the limiting plate. Balance blocks are fixedly installed on the outer wall of the balance ring. Adjusting rods are rotatably installed on both sides of the balance blocks. Thread grooves are provided on the outer walls of the two adjusting rods. Connecting sleeves are provided on the outer walls of the two adjusting rods. A limiting - type sliding sleeve is fixedly installed on one side of the connecting sleeve. A horizontally - arranged positioning - type push rod is slidably installed inside the limiting - type sliding sleeve. One end of the positioning - type push rod extending out of the outer wall of the support - type bottom frame is fixedly connected to a sampling cylinder. A pressing mechanism is provided at the top of the positioning mechanism, and a soil - loosening mechanism is provided on the outer wall of the pressing mechanism.

[0006] By adopting the above - mentioned technical solution, multiple positioning - type push rods and sampling cylinders can be simultaneously extruded from the corresponding horizontal plane directions towards the inner wall of the pit, so that the sampling cylinders are inserted into the side wall of the sampling pit, and multiple sampling cylinders can simultaneously perform multi - point quantitative sampling on the inner wall of the sampling pit. It is convenient and fast to use, and is more conducive to improving work efficiency.

[0007] In a preferred embodiment, the thread directions of the thread grooves provided on the outer walls of the two adjusting rods are set to be opposite. The connecting sleeve is threadedly connected to the outer wall of the adjusting rod, and the two connecting sleeves are symmetrically arranged about the horizontal center line of the balance block.

[0008] By adopting the above - mentioned technical solution, the two limiting - type sliding sleeves can move synchronously in opposite directions, thereby driving the positions of the corresponding sampling cylinders to change. Then, when the whole device is inserted into the pit for multi - layer sampling, sampling can be carried out according to different point - position requirements, which is very convenient to use and more conducive to actual use.

[0009] In a preferred embodiment, the number of the limiting plates is set to two. Through - holes are provided on the outer walls of the two limiting plates. The limiting - type sliding sleeve is slidably installed inside the through - holes.

[0010] By adopting the above - mentioned technical solution, when adjusting the distance between the two connecting sleeves, the limiting - type sliding sleeve can stably slide inside the inner cavity of the through - hole for displacement adjustment synchronously, making the overall adjustment of the sampling point position smoother.

[0011] In a preferred embodiment, a gear ring is fixedly installed on the top of the adjusting rod. An adjusting - type rotating plate is rotatably installed on the top of the support - type bottom frame. An arc - shaped gear plate meshing with the adjusting - type rotating plate is fixedly installed on the outer wall of the adjusting - type rotating plate.

[0012] By adopting the above technical solution, the corresponding gear ring is deflected by rotating the adjustable turning plate, driving the adjusting rod to rotate, and then changing the distance between the two connecting sleeves and the limiting sliding sleeve.

[0013] In a preferred embodiment, a plurality of limiting strips are fixedly installed on the outer wall of the positioning push rod. A first telescopic spring is fixedly installed between the limiting strips and the limiting sliding sleeve. A plurality of positioning grooves are fixedly installed on the inner wall of the limiting sliding sleeve. A plurality of the limiting strips are all slidably installed in the inner cavity of the corresponding positioning groove.

[0014] By adopting the above technical solution, the positioning push rod and the sampling cylinder as a whole can only perform linear translational motion in the horizontal direction, thus avoiding the displacement and deflection of the sampling cylinder during the sampling process, and further affecting the accuracy of sampling the soil in the positioning area.

[0015] In a preferred embodiment, a limiting positioning seat is fixedly installed at the bottom of the supporting bottom frame. A polygonal limiting groove is formed inside the limiting positioning seat; The pressing mechanism includes a rotating rod arranged at the top of the supporting bottom frame. The bottom of the rotating rod is fixedly connected with a threaded rod. The bottom of the threaded rod is fixedly connected with a pressing block. A polygonal positioning block is rotatably installed at the bottom of the pressing block. The polygonal positioning block is inserted into the inner cavity of the polygonal limiting groove. The pressing block is arranged in an elliptical shape.

[0016] By adopting the above technical solution, when the pressing block as a whole is rotated, the outer wall of the pressing block can sequentially press and contact one side of the positioning push rod, so that a plurality of sampling cylinders are forced to be inserted into the side wall of the sampling pit.

[0017] In a preferred embodiment, the soil loosening mechanism includes a threaded sleeve threadedly connected to the outer wall of the threaded rod. Two sliding rods are fixedly installed on the outer wall of the threaded sleeve. A first pressing plate is fixedly installed on the outer walls of the two sliding rods. A plurality of second pressing plates are fixedly installed on the outer wall of the first pressing plate in an equidistant state in a circular shape in sequence; Limiting frames are slidably installed on the outer walls of the two sliding rods. A connecting rod fixedly connected with the supporting bottom frame is fixedly installed on one side of the limiting frame. A second telescopic spring is fixedly installed between the first pressing plate and the supporting bottom frame.

[0018] By adopting the above technical solution, a plurality of second pressing plates are inserted into the peripheral soil of the sampling pit from top to bottom, and the plurality of second pressing plates are in contact with the side wall of the sampling cylinder, loosening the soil in contact with the outer periphery of the sampling cylinder, expanding the outer circumferential diameter of the sampling pit, and preventing the sampling cylinder from getting stuck in the side wall of the sampling pit, so as to facilitate the synchronous extraction of a plurality of sampling cylinders quickly.

[0019] The technical effects and advantages of the present invention: 1. In the present invention, a plurality of horizontally movable sampling cylinders are arranged at equal intervals in a ring shape on the outer wall of the supporting bottom frame. When the whole is inserted into the sampling pit, when the plurality of sampling cylinders horizontally displace and penetrate into the side wall of the sampling pit, sampling can be synchronously carried out at different heights, and synchronous multi-point sampling can be carried out at the same height, which is more convenient to use and more conducive to improving work efficiency. 2. In the present invention, by setting an adjusting rod and a connecting sleeve that can be rotationally adjusted, the distance between the two limiting sliding sleeves can be changed, and then the distance between the two sampling cylinders can be changed. Furthermore, when sampling at different height points of the soil inside the sampling pit, it is more convenient to adjust and has stronger practicability. 3. In the present invention, while the rotation pressing mechanism drives the plurality of sampling cylinders to synchronously displace and penetrate into the soil for sampling, the threaded sleeve moves downward on the outer wall of the rotating threaded rod, so that the extrusion block drives the polygonal positioning block to synchronously penetrate into the soil outside the sampling pit, thereby loosening the soil outside the sampling pit, further quickly loosening the plurality of sampling cylinders from the soil, preventing the sampling cylinders from getting stuck inside the side wall of the sampling pit, and facilitating the quick synchronous removal of the plurality of sampling cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of a partial structure of the pressing mechanism and the soil loosening mechanism of the present invention.

[0022] Figure 3 It is a schematic diagram of a partial structure of the positioning mechanism and the sampling mechanism of the present invention.

[0023] Figure 4 For the present invention Figure 3 An enlarged view of the structure of part A.

[0024] Figure 5 It is a front sectional view of the structure of the present invention.

[0025] Figure 6 For the present invention Figure 5 An enlarged view of the structure of part B.

[0026] Figure 7 For the present invention Figure 5 An enlarged view of the structure of part C.

[0027] The reference numerals are: 1 positioning mechanism, 101 supporting bottom frame, 102 limiting positioning seat, 103 polygonal limiting groove, 104 adjustable rotating plate, 105 arc gear plate, 2 sampling mechanism, 21 limiting plate, 22 balance weight, 23 adjusting rod, 24 connecting sleeve, 25 limiting sliding sleeve, 26 gear ring, 27 positioning push rod, 28 limiting strip, 29 first telescopic spring, 210 sampling cylinder, 211 balance ring, 212 sliding groove, 213 positioning groove, 3 pressing mechanism, 31 rotating rod, 32 threaded rod, 33 extrusion block, 34 polygonal positioning block, 4 soil loosening mechanism, 41 threaded sleeve, 42 sliding rod, 43 first pressing plate, 44 second pressing plate, 45 connecting rod, 46 limiting frame, 47 second telescopic spring. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Referring to the attached drawings of the specification Figures 1-7 , a layered sampling device for soil detection sampling according to an embodiment of the present invention, as Figure 1 shown, includes a positioning mechanism 1, and a plurality of sampling mechanisms 2 are provided on the outer wall of the positioning mechanism 1; Referring to Figures 3-4 shown, the positioning mechanism 1 includes a supporting bottom frame 101, and the sampling mechanism 2 includes a limiting plate 21 fixedly installed on the outer wall of the supporting bottom frame 101. A balance ring 211 is fixedly installed on the horizontal center line of the limiting plate 21. A balance weight 22 is fixedly installed on the outer wall of the balance ring 211. Adjusting rods 23 are rotatably installed on both sides of the balance weight 22. Threaded grooves are provided on the outer walls of the two adjusting rods 23. Connecting sleeves 24 are provided on the outer walls of the two adjusting rods 23. A limiting sliding sleeve 25 is fixedly installed on one side of the connecting sleeve 24. Combining Figure 4 and Figure 6 shown, a horizontally arranged positioning push rod 27 is slidably installed inside the limiting sliding sleeve 25. One end of the positioning push rod 27 extending out of the outer wall of the supporting bottom frame 101 is fixedly connected to a sampling cylinder 210. The purpose of such a setting is that when the entire supporting bottom frame 101 is placed into the dug sampling pit, by pressing the plurality of positioning push rods 27 and the sampling cylinders 210 against the inner wall of the pit from the corresponding horizontal directions, the sampling cylinders 210 can be inserted into the side wall of the sampling pit, so that the plurality of sampling cylinders 210 can simultaneously perform multi-point quantitative sampling on the inner wall of the sampling pit, which is convenient and fast to use and is more conducive to improving work efficiency; The top of the positioning mechanism 1 is provided with a pressing mechanism 3, and the outer wall of the pressing mechanism 3 is provided with a soil loosening mechanism 4.

[0030] As a further expansion of this solution, refer to Figure 4 As shown, the thread directions of the thread grooves formed on the outer walls of the two adjusting rods 23 are arranged in opposite states. The connecting sleeve 24 is threadedly connected to the outer wall of the adjusting rod 23, and the two connecting sleeves 24 are symmetrically arranged with respect to the horizontal center line of the balance block 22. The purpose of this setting is that when the two adjusting rods 23 are rotated, the connecting sleeves 24 on the outer walls of the two adjusting rods 23 can be synchronously moved up and down, and then the two limit type sliding sleeves 25 move in opposite directions synchronously, thereby driving the positions of the corresponding sampling cylinders 210 to change. Then, when the whole device is inserted into the pit for multi-layer sampling, sampling can be carried out according to different point position requirements, which is very convenient to use and more convenient for actual use.

[0031] Further, the number of the limiting plates 21 is set to two. Through holes 212 are formed in the outer walls of the two limiting plates 21 in a penetrating manner. The limit type sliding sleeve 25 is slidably installed inside the through hole 212. The purpose of this setting is that when the distance between the two connecting sleeves 24 is adjusted, the limit type sliding sleeve 25 can be stably slid inside the through hole 212 of the through hole 212 for displacement adjustment synchronously, making the overall adjustment of the sampling point position smoother. Further, refer to Figure 4 As shown, a gear ring 26 is fixedly installed at the top of the adjusting rod 23, and an adjusting type rotating plate 104 is rotatably installed at the top of the supporting bottom frame 101. An arc-shaped gear plate 105 meshing with the adjusting type rotating plate 104 is fixedly installed on the outer wall of the adjusting type rotating plate 104. The purpose of this setting is that when the supporting bottom frame 101 drives the corresponding sampling cylinder 210 into the pit as a whole, the corresponding gear ring 26 can be deflected by rotating the adjusting type rotating plate 104 to drive the adjusting rod 23 to rotate, and then the distance between the two connecting sleeves 24 and the limit type sliding sleeve 25 changes.

[0032] Further, a plurality of limiting strips 28 are fixedly installed on the outer wall of the positioning type push rod 27. A first telescopic spring 29 is fixedly installed between the limiting strip 28 and the limit type sliding sleeve 25. A plurality of positioning grooves 213 are fixedly installed on the inner wall of the limit type sliding sleeve 25. A plurality of limiting strips 28 are slidably installed inside the corresponding positioning grooves 213. The purpose of this setting is that when the positioning type push rod 27 drives the sampling cylinder 210 to move into the inner wall of the pit as a whole, through the two-way limitation of the limiting strip 28 combined with the positioning groove 213, the positioning type push rod 27 and the sampling cylinder 210 as a whole can only perform horizontal linear translation motion, thereby avoiding the displacement deviation of the sampling cylinder 210 during the sampling process and further affecting the accuracy of sampling the soil in the positioning area.

[0033] As a further expansion of this solution, refer to Figures 4-5 As shown, a limit-type positioning seat 102 is fixedly installed at the bottom of the support-type bottom frame 101. A polygonal limit groove 103 is opened inside the limit-type positioning seat 102. Combining Figure 5 and Figure 2 As shown, the pressing mechanism 3 includes a rotating rod 31 arranged at the top of the support-type bottom frame 101. A threaded rod 32 is fixedly connected to the bottom of the rotating rod 31. A pressing block 33 is fixedly connected to the bottom of the threaded rod 32. A polygonal positioning block 34 is rotatably installed at the bottom of the pressing block 33. The polygonal positioning block 34 is inserted into the inner cavity of the polygonal limit groove 103. The purpose of such a setting is that after the entire support-type bottom frame 101 is placed into the sampling pit, by placing the entire pressing mechanism 3 into the inner cavity of the support-type bottom frame 101, the polygonal positioning block 34 is inserted into the inner cavity of the polygonal limit groove 103, completing the limit connection between the pressing block 33 and the support-type bottom frame 101. Among them, the pressing block 33 is arranged in an elliptical shape. The purpose of such a setting is that when the entire pressing block 33 is rotated, the outer wall of the pressing block 33 can sequentially press and contact one side of the positioning-type push rod 27, so that multiple sampling cylinders 210 are forced to be inserted into the side wall of the sampling pit.

[0034] Synchronously, refer to Figure 2 and Figure 7 As shown, the soil loosening mechanism 4 includes a threaded sleeve 41 threadedly connected to the outer wall of the threaded rod 32. Two sliding rods 42 are fixedly installed on the outer wall of the threaded sleeve 41. A first pressing plate 43 is fixedly installed on the outer walls of the two sliding rods 42. A plurality of second pressing plates 44 are fixedly installed on the outer wall of the first pressing plate 43 in an equidistant state in a circular shape. While rotating the entire rotating rod 31 to make the pressing block 33 synchronously press the positioning-type push rod 27 and the sampling cylinders 210, the threaded sleeve 41 moves downward on the outer wall of the threaded rod 32, and then the first pressing plate 43 drives the plurality of second pressing plates 44 to move downward synchronously until the plurality of second pressing plates 44 are inserted into the peripheral soil of the sampling pit from top to bottom, and the plurality of second pressing plates 44 are in contact with the side walls of the sampling cylinders 210, loosening the soil in contact with the outer circumference of the sampling cylinders 210, expanding the outer circumferential diameter of the sampling pit, preventing the sampling cylinders 210 from getting stuck in the side wall of the sampling pit, so as to quickly take out the plurality of sampling cylinders 210 synchronously. At the same time, limit frames 46 are slidably installed on the outer walls of the two sliding rods 42. A connecting rod 45 fixedly connected to the support-type bottom frame 101 is fixedly installed on one side of the limit frame 46. A second telescopic spring 47 is fixedly installed between the first pressing plate 43 and the support-type bottom frame 101. The purpose of such a setting is that the limit frame 46 limits the sliding rod 42, so that when the entire threaded rod 32 is rotated, the threaded sleeve 41 will not rotate synchronously with it, and when the entire sliding rod 42 moves up and down along with the threaded sleeve 41, it is more stable and smooth, and more convenient for actual use.

[0035] The following points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. It can be a mechanical connection or an electrical connection, or it can be the internal communication of two components. It can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to indicate the relative positional relationship. When the absolute position of the object being described changes, the relative positional relationship may change; Second, in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A layered sampling device for soil testing and sampling, comprising a positioning mechanism (1), wherein a plurality of sampling mechanisms (2) are arranged on the outer wall of the positioning mechanism (1); Features: The positioning mechanism (1) comprises a supporting bottom frame (101), and the sampling mechanism (2) comprises a limiting plate (21) fixedly mounted on the outer wall of the supporting bottom frame (101); a balancing ring (211) is fixedly mounted on the horizontal center line of the limiting plate (21); a balancing block (22) is fixedly mounted on the outer wall of the balancing ring (211); adjustment rods (23) are rotatably mounted on both sides of the balancing block (22); the outer walls of the two adjusting rods (23) are provided with threaded grooves; the outer walls of the two adjusting rods (23) are provided with connecting sleeves (24); a limiting sliding sleeve (25) is fixedly mounted on one side of the connecting sleeve (24); a positioning push rod (27) arranged horizontally is slidably mounted inside the limiting sliding sleeve (25); one end of the positioning push rod (27) extending out of the outer wall of the supporting bottom frame (101) is fixedly connected to a sampling tube (210); A pressing mechanism (3) is provided on the top of the positioning mechanism (1), and a soil loosening mechanism (4) is provided on the outer wall of the pressing mechanism (3).

2. A stratified sampling device for soil detection sampling according to claim 1, characterized in that: The thread directions of the thread grooves formed on the outer walls of the two adjusting rods (23) are arranged in opposite directions, the connecting sleeve (24) is threadedly connected to the outer wall of the adjusting rod (23), and the two connecting sleeves (24) are symmetrically arranged about the horizontal center line of the balancing block (22).

3. A stratified sampling device for soil detection sampling according to claim 2, characterized in that: The number of the limiting plates (21) is set to two, and the outer walls of the two limiting plates (21) are provided with sliding grooves (212) arranged in a penetrating shape, and the limiting sliding sleeves (25) are slidably mounted inside the sliding grooves (212).

4. A stratified sampling device for soil detection sampling according to claim 3, characterized in that: A gear ring (26) is fixedly mounted on the top of the adjusting rod (23), an adjusting rotating plate (104) is rotatably mounted on the top of the supporting bottom frame (101), and an arc-shaped gear plate (105) meshing with the adjusting rotating plate (104) is fixedly mounted on the outer wall of the adjusting rotating plate (104).

5. A stratified sampling device for soil detection sampling according to claim 4, characterized in that: A plurality of limit strips (28) are fixedly mounted on the outer wall of the positioning push rod (27); a first telescopic spring (29) is fixedly mounted between the limit strip (28) and the limit sleeve (25); a plurality of positioning grooves (213) are fixedly mounted on the inner wall of the limit sleeve (25); and the plurality of limit strips (28) are slidably mounted in the inner cavities of the corresponding positioning grooves (213).

6. A stratified sampling device for soil detection sampling according to claim 5, characterized in that: A limited positioning seat (102) is fixedly mounted on the bottom of the supporting bottom frame (101), and a polygonal limited groove (103) is provided inside the limited positioning seat (102); The pressing mechanism (3) comprises a rotating rod (31) arranged at the top of the supporting bottom frame (101); the bottom of the rotating rod (31) is fixedly connected to a threaded rod (32); the bottom of the threaded rod (32) is fixedly connected to an extrusion block (33); the bottom of the extrusion block (33) is rotatably mounted with a polygonal positioning block (34); the polygonal positioning block (34) is inserted into the inner cavity of the polygonal limiting groove (103); and the extrusion block (33) is arranged in an elliptical shape.

7. A stratified sampling device for soil detection sampling according to claim 6, characterized in that: The loosening mechanism (4) comprises a threaded sleeve (41) threadedly connected to the outer wall of the threaded rod (32); two sliding rods (42) are fixedly mounted on the outer wall of the threaded sleeve (41); a first pressing plate (43) is fixedly mounted on the outer walls of the two sliding rods (42); and a plurality of second pressing plates (44) are fixedly mounted on the outer wall of the first pressing plate (43) in an annular shape and equidistantly in sequence. The outer walls of the two sliding rods (42) are slidably mounted with a limit frame (46), one side of the limit frame (46) is fixedly mounted with a connecting rod (45) fixedly connected to the supporting bottom frame (101), and a second telescopic spring (47) is fixedly mounted between the first pressing plate (43) and the supporting bottom frame (101).

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