Underground rapid supporting device for coal mine complex environment

Abstract

The invention discloses a coal mine complex environment underground rapid supporting device, and relates to the technical field of mine supporting devices, the coal mine complex environment underground rapid supporting device comprises a lower supporting frame and hydraulic cylinders arranged in the two sides of the lower supporting frame, hydraulic oil is arranged in the lower supporting frame, and a first movable plug is installed on the lower portion in the lower supporting frame; and an extrusion rod is fixedly installed below the first movable plug, and a self-ascending mechanism is arranged in the lower supporting frame. The invention discloses an underground rapid supporting device for a coal mine complex environment. Under the action of the self weight of the supporting device, an extrusion rod pushes a first movable plug to move upwards, hydraulic oil in a lower supporting frame further pushes a second movable plug on a fixing ring to move upwards, a third movable plug drives a second thrust rod to move towards the left side, and therefore a side baffle is pushed to be adjusted outwards, the mine collapse risk can be effectively coped with, and the working efficiency is improved. And more reliable safety guarantee is provided for miners, and the probability of occurrence of casualty accidents caused by mine collapse is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mine support devices, and particularly to a rapid support device for underground coal mines in complex environments. Background Art

[0002] In the high-risk industry of coal mining, the complexity and uncertainty of the underground environment pose great challenges to operations. Among them, the problem of mine cave-ins has always been a serious hidden danger threatening the lives of miners and the normal production of coal mines. However, there are some significant problems in the existing mine support devices during use.

[0003] Traditional support devices often have overly complex structural designs, including numerous components and cumbersome connection methods. This not only increases the manufacturing and maintenance costs but also requires a series of complex steps and procedures during actual installation and operation, with relatively high technical requirements for operators. In emergency situations, such as sudden loosening of the rock layer or small-scale cave-ins, this complex operation process often leads to the waste of precious time and the inability to provide effective support for the mine cave in a timely manner, thus greatly increasing the possibility of mine cave-ins and seriously threatening the lives of underground workers. Such complex devices cannot respond quickly and provide timely and effective support, resulting in a rapid deterioration of the dangerous situation and a sharp increase in the possibility of mine cave-ins, posing a great threat to the lives of miners.

[0004] For example, a mine roadway support device with the publication number CN117404119A includes: a base, with baffles fixedly connected to both ends of the base. The tops of the two baffles are fixedly connected to both ends of the arch top. A steel truss assembly is provided at the bottom of the arch top. The bottom of the steel truss assembly is drivingly connected to a bending support assembly, and the bending support assembly is drivingly connected to a driving part. A strengthening part is provided between the baffle and the base. By driving the bending support assembly at the bottom of the steel truss assembly through the driving part to generate bending stress, the direction of the bending stress is upward, offsetting the surrounding rock pressure transmitted downward on the arch top and the steel truss assembly, and further enhancing the bearing capacity of the arch top;

[0005] For example, an underground inner wall support device for coal mine roadways with the publication number CN111706379B includes a first slide rail and a second slide rail; a support mechanism is arranged on the tops of the first slide rail and the second slide rail, and the lifting of the support mechanism is driven by a corresponding gear screw drive assembly, facilitating the support of the roadway top and also facilitating the movement of the support mechanism; an anchoring mechanism is arranged on the tops on both sides of the first slide rail, and the roadway is anchored by corresponding detachable anchor bolts. At the same time, through a corresponding flexible connection method, it is convenient to check the offset of the anchor bolts; during use, a limiting mechanism is arranged on the anchoring mechanism, and through a corresponding rack limiting structure, it is convenient to limit the anchoring mechanism, avoiding the offset or loosening of the anchoring mechanism and ensuring the corresponding anchoring effect.

[0006] In the use of the above-mentioned mine roadway support device, it is necessary to manually shake to support the mine. If the ore in the mine falls off, it cannot be quickly adjusted, and it cannot automatically adjust to support the mine cave. However, the existing support devices are not satisfactory in terms of supporting force. For example, they cannot effectively reduce the buffer and require manual adjustment of the support angle. Due to the diversity and complexity of the geological conditions underground in coal mines, the rock pressure may fluctuate greatly. However, the designs of many traditional support devices cannot withstand this change, and their supporting force appears weak when facing large rock pressures and cannot be accurately adjusted and optimized according to the actual situation of the mine cave. This means that in the face of a complex and changeable mine cave environment, these devices often cannot fully play their due supporting role, thus making the stability of the mine cave unable to be effectively guaranteed; when the rock layer loosens, these devices are difficult to provide sufficient supporting force to stabilize the rock structure, resulting in poor supporting effects and being unable to effectively prevent cave-ins, bringing great safety hazards to coal mine production, and may also cause serious damage to the support device itself and surrounding equipment, further exacerbating the harm degree of the accident and the subsequent repair cost. Summary of the Invention

[0007] The purpose of the present invention is to provide a rapid support device for coal mines in complex underground environments to solve the problems of manually shaking to support the mine, being unable to effectively reduce the buffer, and requiring manual adjustment of the support angle mentioned in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A rapid support device for coal mines in complex underground environments, including a lower support frame and hydraulic cylinders opened inside both sides of the lower support frame. The lower support frame is internally provided with hydraulic oil, and a first piston is installed below the lower support frame. And a pressing rod is fixedly installed below the first piston, and the pressing rod is installed through the lower support frame. A self-rising mechanism is arranged inside the lower support frame;

[0009] An upper support frame is arranged above the lower support frame. The upper support frame is semi-circular, and a damping cylinder is fixedly installed above the upper support frame. And two damping cylinders are symmetrically distributed above the upper support frame. A self-adjusting and shock-absorbing mechanism is arranged outside the lower support frame.

[0010] Further, the self-rising mechanism includes a fixed ring installed above the lower support frame inside the lower support frame. A second piston is installed above the fixed ring. And a first thrust rod is fixedly installed above the second piston. And an upper support frame is fixedly installed above the first thrust rod.

[0011] Further, a pressing cylinder is installed through the left side of the lower support frame. The pressing cylinder is below the lower support frame. And a third piston is nested inside the pressing cylinder. And a second thrust rod is fixedly installed at the left end of the third piston.

[0012] Furthermore, a rotating ball is provided at the left end of the second thrust rod, and the left end of the second thrust rod is connected to the groove ball. Moreover, the left end of the groove is fixedly installed in the middle of the right side of the side baffle, and the side baffle is distributed symmetrically with two support frames as the center.

[0013] Furthermore, the self-adjusting and shock-absorbing mechanism includes a damping cylinder with a damping piston installed inside. A hole is provided on the damping piston, and the holes on the damping piston are evenly distributed in ten around the damping cylinder as the rotation center. A return spring is installed at the lower end of the damping piston, and the lower part of the return spring is fixedly installed at the lower part inside the damping cylinder.

[0014] Furthermore, a damping rod is fixedly installed above the damping piston, and the upper part of the damping rod is rotatably installed on the upper baffle. Connecting baffles are rotatably installed on both sides of the upper baffle, and the upper baffle and the connecting baffles are arc-shaped.

[0015] Furthermore, adjusting oil pipes are installed through both sides of the support frame, and the other ends of the adjusting oil pipes are fixedly installed on the side baffle. The adjusting oil pipes are distributed symmetrically with two on the side baffle.

[0016] Furthermore, an extrusion airbag is installed below the lower support frame, and the extrusion airbag is arranged on the outer surface below the extrusion rod. An air supply hose is installed through the extrusion airbag. Fixed cylinders are fixedly installed on both sides of the upper support frame, and a docking airbag is adhesively installed inside the fixed cylinder. The other end of the air supply hose is installed through the docking airbag. Moreover, an extrusion piston is installed on the other side of the docking airbag. The other end of the extrusion piston is fixedly installed with a third thrust rod, and the third thrust rod is installed through the fixed cylinder.

[0017] Furthermore, the fixing plate is fixedly installed at the upper end of the upper support frame. A rotating shaft is rotatably installed on the fixing plate, and a wave rod is fixedly installed at the front end of the rotating shaft. Moreover, the other end of the third thrust rod corresponds to the inner side of the wave rod. The other end of the rotating shaft is fixedly installed below the rotating rod, and the upper end of the rotating rod is fixedly installed below the connecting baffle.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the rapid support device for underground coal mines in complex environments;

[0019] 1. Due to the weight of the support device itself, the extrusion rod pushes the first movable plug to move upward, causing the hydraulic oil inside the lower support frame to surge upward, and the hydraulic oil in the lower support frame then pushes the second movable plug on the fixed ring upward, and the second movable plug pushes the first thrust rod to move upward, and the first thrust rod drives the upper support frame to rise. At the same time, the hydraulic oil in the lower support frame also pushes the third movable plug in the extrusion cylinder, and the third movable plug drives the second thrust rod to move to the left, thereby pushing the side baffle to adjust outward, which can effectively cope with the risk of mine collapse, provide more reliable safety protection for miners, and significantly reduce the probability of casualties caused by mine collapse.

[0020] Furthermore, by utilizing its own weight to move the support device upward and expand the support to both sides, it can quickly and comprehensively cover the key parts of the mine, minimize the support response time, and avoid delays caused by complex operations, thereby winning precious time for timely response to emergencies in the mine and building a solid safety line for the miners; whether facing sudden mine collapse or dangerous situations such as ore falling, it can effectively block and buffer, significantly reducing the risk of miners' injuries and effectively protecting the lives of miners.

[0021] Furthermore, especially when ore falls off onto the support device, the weight of the support device increases, which increases the pressure and the support for the mine, making it better able to withstand the impact force, thereby effectively reducing the risk of injury to miners caused by falling ore and effectively protecting the lives of miners. The stable and reliable support effect reduces the time of shutdown and resumption of production due to accidents such as mine collapse, increases the effective production time of coal mines, and thus brings significant economic benefits to coal mining enterprises.

[0022] 2. When the upper part of the coal mine falls off, the pressure from above acts on the upper baffle, and the upper baffle presses the damping rod downward, and the damping rod pushes the damping piston downward. At this time, the damping piston squeezes the hydraulic oil inside the damping cylinder downward, and the hydraulic oil inside the damping cylinder slowly flows upward through the hole on the damping piston. Then, the angle of the side baffle is adjusted by adjusting the oil pipe; the docking airbag pushes the extrusion piston with the help of the shape inside the fixed cylinder, and the extrusion piston pushes the third thrust rod, and the other end of the third thrust rod pushes the wave rod to rotate, and the wave rod drives the rotating shaft to rotate on the fixed plate, and the other end of the rotating shaft drives the rotating rod to rotate, and the other end of the rotating rod drives the connecting baffle to rotate with the side end of the upper baffle as the axis, thereby adjusting the angle.

[0023] Furthermore, the device effectively absorbs and disperses the impact force, protects the support device itself and various surrounding equipment, reduces the maintenance cost and equipment replacement frequency, improves the service life and stability of the equipment, provides a solid material basis for the continuous production of the coal mine, and can flexibly adjust the support position and angle to ensure a stable and reliable support effect, creating favorable conditions for the safe mining of the coal mine under various complex geological conditions. Description of the Drawings

[0024] Figure 1 Schematic diagram of the front view three-dimensional structure of the present invention;

[0025] Figure 2 Schematic diagram of the half-section three-dimensional structure of the present invention;

[0026] Figure 3 Schematic diagram of the partial three-dimensional structure of the lower support frame of the present invention;

[0027] Figure 4 Schematic diagram of the three-dimensional structure of the side baffle of the present invention;

[0028] Figure 5 Schematic diagram of the enlarged three-dimensional structure of the extrusion cylinder of the present invention;

[0029] Figure 6 Schematic diagram of the three-dimensional structure of the extrusion airbag of the present invention;

[0030] Figure 7 Schematic diagram of the three-dimensional structure of the rotating rod of the present invention;

[0031] Figure 8 Schematic diagram of the three-dimensional structure of the damping cylinder of the present invention;

[0032] Figure 9 Schematic diagram of the three-dimensional structure of the damping piston of the present invention.

[0033] In the figure: 1. Lower support frame; 2. First movable plug; 3. Extrusion rod; 4. Upper support frame; 5. Damping cylinder; 6. Fixed ring; 7. Second movable plug; 8. First thrust rod; 9. Extrusion cylinder; 10. Third movable plug; 11. Second thrust rod; 12. Card slot; 13. Side baffle; 14. Damping piston; 15. Return spring; 16. Damping rod; 17. Upper baffle; 18. Connecting baffle; 19. Adjusting oil pipe; 20. Extrusion airbag; 21. Air supply hose; 22. Fixed cylinder; 23. Docking airbag; 24. Extrusion piston; 25. Third thrust rod; 26. Fixed plate; 27. Rotating shaft; 28. Fluctuating rod; 29. Rotating rod. Detailed Embodiments

[0034] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Embodiment 1: Please refer to Figures 1-9 , the present invention provides the following technical solution: A rapid support device for underground coal mines in complex environments, including a lower support frame 1, a first movable plug 2, a pressing rod 3, an upper support frame 4, a damping cylinder 5, a fixing ring 6, a second movable plug 7, a first thrust rod 8, a pressing cylinder 9, a third movable plug 10, a second thrust rod 11, a card slot 12, a side baffle 13, a damping piston 14, a return spring 15, a damping rod 16, an upper baffle 17, a connecting baffle 18, an adjusting oil pipe 19, a pressing airbag 20, a gas supply hose 21, a fixing cylinder 22, a docking airbag 23, a pressing piston 24, a third thrust rod 25, a fixing plate 26, a rotating shaft 27, a fluctuating rod 28 and a rotating rod 29.

[0036] It includes a lower support frame 1 and hydraulic cylinders opened inside both sides of the lower support frame 1. The lower support frame 1 is internally provided with hydraulic oil, and a first movable plug 2 is installed below the lower support frame 1. And a pressing rod 3 is fixedly installed below the first movable plug 2, and the pressing rod 3 is installed through the lower support frame 1. A self-rising mechanism is arranged inside the lower support frame 1;

[0037] An upper support frame 4 is arranged above the lower support frame 1, and the upper support frame 4 is semicircular. And a damping cylinder 5 is fixedly installed above the upper support frame 4, and two damping cylinders 5 are symmetrically distributed with the upper support frame 4 as the center. A self-adjusting and shock-absorbing mechanism is arranged outside the lower support frame 1.

[0038] The self-rising mechanism includes a fixing ring 6 installed above the lower support frame 1 inside the lower support frame 1. And a second movable plug 7 is installed above the fixing ring 6. And a first thrust rod 8 is fixedly installed above the second movable plug 7, and the upper support frame 4 is fixedly installed above the first thrust rod 8. A pressing cylinder 9 is installed through the left side of the lower support frame 1, and the pressing cylinder 9 is with the lower support frame 1 as the center. And a third movable plug 10 is nested inside the pressing cylinder 9, and a second thrust rod 11 is fixedly installed at the left end of the third movable plug 10. A rotating ball is arranged at the left end of the second thrust rod 11, and the left end of the second thrust rod 11 is ball-connected with the card slot 12. And the left end of the card slot 12 is fixedly installed in the middle of the right side of the side baffle 13, and two side baffles 13 are symmetrically distributed with the lower support frame 1 as the center.

[0039] Due to the weight of the support device itself, the extrusion rod 3 pushes the first movable plug 2 upward, causing the hydraulic oil inside the lower support frame 1 to surge upward. The hydraulic oil in the lower support frame 1 then pushes the second movable plug 7 on the fixed ring 6 upward, and the second movable plug 7 pushes the first thrust rod 8 upward, and the first thrust rod 8 drives the upper support frame 4 to rise. At the same time, the hydraulic oil in the lower support frame 1 also pushes the third movable plug 10 in the extrusion cylinder 9, and the third movable plug 10 drives the second thrust rod 11 to move to the left, thereby pushing the side baffle 13 to adjust outward.

[0040] The self-adjusting and shock-absorbing mechanism includes a damping piston 14 installed inside the damping cylinder 5, and holes are provided on the damping piston 14, and the holes on the damping piston 14 are evenly distributed in ten around the damping cylinder 5 as the rotation center. A return spring 15 is installed at the lower end of the damping piston 14, and the lower part of the return spring 15 is fixedly installed at the lower part inside the damping cylinder 5.

[0041] A damping rod 16 is fixedly installed above the damping piston 14, and the upper part of the damping rod 16 is rotatably installed on the upper baffle 17. Connecting baffles 18 are rotatably installed on both sides of the upper baffle 17, and the upper baffle 17 and the connecting baffles 18 are arc-shaped. Adjusting oil pipes 19 are installed through both sides of the lower support frame 1, and the other ends of the adjusting oil pipes 19 are fixedly installed on the side baffle 13, and the adjusting oil pipes 19 are symmetrically distributed in two with respect to the side baffle 13.

[0042] When the upper part of the coal mine collapses, the pressure above acts on the upper baffle 17, and the upper baffle 17 presses the damping rod 16 downward, and the damping rod 16 pushes the damping piston 14 downward. At this time, the damping piston 14 squeezes the hydraulic oil inside the damping cylinder 5, and the hydraulic oil inside the damping cylinder 5 slowly flows upward through the holes on the damping piston 14. Then, the damping piston 14 compresses the return spring 15 downward, which can quickly and effectively respond to the risk of mine cave-ins, provide more reliable safety protection for miners, and significantly reduce the occurrence probability of casualty accidents caused by mine cave-ins.

[0043] A squeezing airbag 20 is installed below the lower support frame 1, and the squeezing airbag 20 is arranged on the outer surface below the squeezing rod 3. A gas supply hose 21 is installed through the squeezing airbag 20. Fixed cylinders 22 are fixedly installed on both sides of the upper support frame 4, and docking airbags 23 are adhesively installed inside the fixed cylinders 22. The other end of the gas supply hose 21 is installed through the docking airbag 23. A squeezing piston 24 is installed on the other side of the docking airbag 23. A third thrust rod 25 is fixedly installed at the other end of the squeezing piston 24, and the third thrust rod 25 is installed through the fixed cylinder 22. A fixing plate 26 is fixedly installed at the upper end of the upper support frame 4, and a rotating shaft 27 is rotatably installed on the fixing plate 26. A wave rod 28 is fixedly installed at the front end of the young rotating shaft 27. The other end of the third thrust rod 25 corresponds to the inner side of the wave rod 28. The other end of the rotating shaft 27 is fixedly installed below the rotating rod 29, and the upper end of the rotating rod 29 is fixedly installed below the connecting baffle 18.

[0044] Meanwhile, the hydraulic oil in the lower support frame 1 adjusts the angle of the side baffle 13 through the adjusting oil pipe 19. In addition, the lower support frame 1 squeezes the squeezing airbag 20 downward, and the gas inside the squeezing airbag 20 is transmitted into the docking airbag 23 through the gas supply hose 21. The docking airbag 23 pushes the squeezing piston 24 by virtue of the shape inside the fixed cylinder 22, and the squeezing piston 24 pushes the third thrust rod 25. The other end of the third thrust rod 25 pushes the wave rod 28 to rotate, and the wave rod 28 drives the rotating shaft 27 to rotate on the fixing plate 26. The other end of the rotating shaft 27 drives the rotating rod 29 to rotate, and the other end of the rotating rod 29 drives the connecting baffle 18 to rotate with the side end of the upper baffle 17 as the axis, thereby adjusting the angle, improving the applicability of the device under various complex geological conditions, and reducing the support problems caused by the differences in the shape and angle of the mine tunnel.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. 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 fast underground support device for a coal mine in a complex environment, comprising a lower support frame (1) and hydraulic cylinders provided inside both sides of the lower support frame (1), characterized in that: Hydraulic oil is provided inside the lower support frame (1), and a first movable plug (2) is installed below the lower support frame (1), and an extrusion rod (3) is fixedly installed below the first movable plug (2), and the extrusion rod (3) is installed through the lower support frame (1), and a self-lifting mechanism is provided inside the lower support frame (1); An upper support frame (4) is arranged above the lower support frame (1), and the upper support frame (4) is semicircular, and a damping cylinder (5) is fixedly installed above the upper support frame (4), and two damping cylinders (5) are symmetrically distributed on the upper support frame (4), and a self-adjusting and shock-absorbing mechanism is arranged on the outer side of the lower support frame (1).

2. The underground rapid support device for complex coal mine environment according to claim 1 is characterized by: The self-lifting mechanism comprises a fixing ring (6) installed above the interior of the lower support frame (1), a second movable plug (7) installed above the fixing ring (6), a first thrust rod (8) fixedly installed above the second movable plug (7), and an upper support frame (4) fixedly installed above the first thrust rod (8).

3. The underground rapid support device for complex coal mine environment according to claim 2 is characterized by: An extrusion cylinder (9) is installed through the left side of the lower support frame (1), and the extrusion cylinder (9) is below the support frame (1). A third movable plug (10) is nested inside the extrusion cylinder (9), and a second thrust rod (11) is fixedly installed at the left end of the third movable plug (10).

4. The underground rapid support device for complex coal mine environment according to claim 3 is characterized by: The left end of the second thrust rod (11) is provided with a rotating ball, and the left end of the second thrust rod (11) is connected to the clamping slot (12) ball, and the left end of the clamping slot (12) is fixedly mounted in the middle of the right side of the side baffle (13), and two side baffles (13) are distributed with the support frame (1) below as the symmetrical center.

5. The underground rapid support device for complex coal mine environment according to claim 1 is characterized by: The self-adjusting and shock absorbing mechanism comprises a damping cylinder (5) having a damping piston (14) installed inside, and a hole is provided on the damping piston (14), and the holes on the damping piston (14) are evenly distributed with the damping cylinder (5) as the rotation center, and a return spring (15) is installed at the lower end of the damping piston (14), and the lower part of the return spring (15) is fixedly installed at the lower part of the damping cylinder (5).

6. The underground rapid support device for complex coal mine environment according to claim 5 is characterized by: A damping rod (16) is fixedly mounted above the damping piston (14), and an upper baffle (17) is rotatably mounted above the damping rod (16). Connecting baffles (18) are rotatably mounted on both sides of the upper baffle (17), and the upper baffle (17) and the connecting baffles (18) are arc-shaped.

7. The underground rapid support device for complex coal mine environment according to claim 6 is characterized by: Adjustment oil pipes (19) are installed through both sides of the lower support frame (1), and the other end of the adjustment oil pipe (19) is fixedly installed on the side baffle (13), and two adjustment oil pipes (19) are symmetrically distributed on the side baffle (13).

8. The underground rapid support device for complex coal mine environment according to claim 7 is characterized by: An extrusion airbag (20) is installed below the lower support frame (1), and the extrusion airbag (20) is arranged on the outer surface below the extrusion rod (3), and an air supply hose (21) is installed through the extrusion airbag (20), fixed cylinders (22) are fixedly installed on both sides of the upper support frame (4), and a docking airbag (23) is glued and installed inside the fixed cylinder (22), and the other end of the air supply hose (21) is installed through the docking airbag (23), and an extrusion piston (24) is installed on the other side of the docking airbag (23), and a third thrust rod (25) is fixedly installed on the other end of the extrusion piston (24), and the third thrust rod (25) is installed through the fixed cylinder (22).

9. The underground rapid support device for complex coal mine environment according to claim 8, characterized in that: The fixed plate (26) is fixedly mounted on the upper end of the upper support frame (4), and a rotating shaft (27) is rotatably mounted on the fixed plate (26), and a wave rod (28) is fixedly mounted on the front end of the young rotating shaft (27), and the other end of the third thrust rod (25) corresponds to the inner side of the wave rod (28), the other end of the rotating shaft (27) is fixedly mounted below the rotating rod (29), and the upper end of the rotating rod (29) is fixedly mounted below the connecting baffle (18).

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