Rotary heat exchanger

Abstract

The application relates to the technical field of heat exchangers, and discloses a rotary heat exchanger which comprises a mounting frame and two collecting boxes, the two collecting boxes are fixedly arranged at the upper and lower ends of the mounting frame, the front and back surfaces of the mounting frame are both provided with placing grooves, the side walls of the placing grooves are provided with U-shaped frames at the middle ends, filter frames are arranged in the placing grooves and located at the inner sides of the U-shaped frames, the centers of the U-shaped frames are provided with fixing assemblies, and rotating mechanisms are arranged at the centers of the outer surfaces of the two collecting boxes. The rotary heat exchanger is provided with the rotating mechanisms, the rotating pipes are provided with bearing pieces on the outer sides, the outer rings of the bearing pieces are in interference fit with the inner walls of the end covers, the rotating pipes and the end covers are rotatably connected, the heat exchanger can rotate as a whole, the sealing structure of the rotating mechanism is a detachable structure, and the detachability of the heat exchanger can be ensured.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to rotary heat exchangers. Background Technology

[0002] A heat exchanger is a device that transfers part of the heat from a hot fluid to a cold fluid. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions.

[0003] Because existing heat exchangers are generally fixed installations, in some applications, the operation of the heat exchangers needs to be adjusted for energy saving. For example, in the beer malting process, the temperature of the malting chamber needs to be controlled at about 12-15℃ during malting, so the heat exchanger needs to operate at its maximum capacity in summer; when the outside temperature deviates slightly from 12-15℃, the heat exchanger only needs to operate at a partial capacity; and when the outside temperature is between 12-15℃, the heat exchanger can be shut down. However, the current situation is that heat exchangers are all fixedly arranged. Even when shut down, there is still resistance loss when air flows into the heat exchanger, resulting in energy loss for the fan and hindering energy saving.

[0004] To protect the heat exchange tubes from damage, existing heat exchangers require protective nets to be installed on the outside of the tubes. These nets are typically welded or fixed to the heat exchanger bracket with screws. The installation and disassembly process is cumbersome, time-consuming, labor-intensive, and inconvenient for future maintenance and replacement of the heat exchange tubes. Therefore, a rotary heat exchanger is needed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rotary heat exchanger that solves the problems mentioned in the background.

[0006] This invention provides the following technical solution: a rotary heat exchanger, comprising:

[0007] Mounting frame, the mounting frame being equipped with heat exchange tubes;

[0008] The junction box is provided in two parts, and the two junction boxes are respectively fixedly installed at the upper and lower ends of the mounting frame;

[0009] The mounting frame has placement slots on both sides. A U-shaped frame is provided in the middle of the side wall of the placement slot. A filter frame is provided inside the placement slot and inside the U-shaped frame. A fixing component is provided in the center of the U-shaped frame. A rotating mechanism is provided in the center of the outer surface of the two junction boxes.

[0010] The fixing component includes a drive screw, which is threadedly connected to the U-shaped bracket.

[0011] The rotating mechanism includes a fixed tube, one end of which is fixedly connected to the junction box and communicates with the inside of the junction box.

[0012] Preferably, the fixing component further includes an L-shaped support block, a connecting plate, and a handle. The front end of the drive screw is fixedly connected to the handle, and the end of the drive screw away from the handle passes through the front wall of the U-shaped frame and is rotatably connected to the connecting plate.

[0013] Preferably, the connecting plate is fixedly connected to the L-shaped support block on the side opposite to the drive screw, and the filter frame has a U-shaped locking block that cooperates with the L-shaped support block through a fixing plate at the center of the front side.

[0014] Preferably, the rotating mechanism further includes an end cap, a rotating tube, and a bearing component. The end cap is disposed inside the fixed tube at the end away from the manifold. A through hole is provided in the center of the end cap. One end of the rotating tube passes through the through hole and extends into the fixed tube. The bearing component is sleeved on the outer surface of the rotating tube and is interference-fitted with the inner wall of the end cap. The end of the rotating tube away from the end cap is connected to an external connecting pipe.

[0015] Preferably, a retaining platform is provided on the outer surface of the end cap at a position corresponding to the inner wall of the fixing tube, and a fixing base pad is provided between the outer surface of the end cap and the inner wall of the fixing tube through the retaining platform. An intermediate sealing gasket is provided on the front side of the fixing base pad, and two compression rings are provided on the side of the intermediate sealing gasket away from the fixing base pad.

[0016] Preferably, an extrusion groove is formed between the two extrusion rings, an inner support ring is provided on the inner side of the extrusion ring, and a fastening bolt is provided at the middle end of the intermediate sealing gasket and the inner support ring, and the inner support ring is inserted into the extrusion groove by the fastening bolt.

[0017] Preferably, the outer surface of one end of the rotating tube inserted into the fixed tube is provided with an extension edge, and a sealing ring is provided between the inner side of the extension edge of the rotating tube and the side wall of the end cap. There are two sealing rings, and both sealing rings are sleeved on the outer surface of the rotating tube. A compression spring is provided between the two sealing rings.

[0018] Preferably, a positioning component is provided on the outside of the rotating mechanism located at the lower end of the mounting frame. The positioning component includes a toothed ring, a rack, and a pull rod. The toothed ring is fixedly sleeved on the outer surface of the fixing tube, the rack is disposed on one side of the toothed ring, and the side of the rack away from the toothed ring is fixedly connected to the end of the pull rod.

[0019] Preferably, the positioning component further includes a return spring, a limiting block, a vertical plate, and a bottom frame. The limiting block is sleeved on the outer surface of the pull rod and slidably connected to the pull rod. The return spring is sleeved on the outer surface of the pull rod. One end of the return spring is fixedly connected to the rack, and the end of the return spring away from the rack is connected to the limiting block.

[0020] Preferably, the vertical plate is fixedly disposed at the center of the lower surface of the limiting block, the bottom frame is fixedly disposed at the lower end of the vertical plate, and a rotatable bidirectional screw is disposed on the outer side of the bottom frame through a mounting bracket. The threads at both ends of the bidirectional screw are in opposite directions. Sliding clamps are disposed at both ends of the bottom frame away from the bidirectional screw. One end of the clamp passes through the opening of the bottom frame and is threadedly connected to the bidirectional screw. The clamp is slidably connected to the inner wall of the opening of the bottom frame.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This rotary heat exchanger, by setting a rotating mechanism, has a bearing sleeve on the outside of the rotating tube and the outer ring of the bearing sleeve is interference fit with the inner wall of the end cover, which can realize the rotatable connection between the rotating tube and the end cover, and realize the overall rotation of the heat exchanger. The sealing structure of the rotating mechanism is a detachable structure, which can ensure the ease of disassembly and assembly of the heat exchanger.

[0023] 2. When installing the filter frame in this rotary heat exchanger, first insert the filter frame into the U-shaped frame and move it vertically downwards. When the U-shaped locking block and the L-shaped support block engage with each other, release the filter frame. Then, turn the handle to drive the drive screw to rotate synchronously. During the rotation of the drive screw, it pushes the connecting plate and the L-shaped support block towards the installation frame. Then, the L-shaped support block pushes the filter frame into the placement slot through the U-shaped locking block, making the filter frame easy to install and easy to disassemble and maintain later.

[0024] 3. This rotary heat exchanger, by rotating the bidirectional screw, allows the two clamping plates to move closer to each other under the limiting action of the bottom frame. As the two clamping plates move closer, they can effectively clamp the external connecting pipe connected to the rotating tube, thus fixing the position of the positioning component. Then, by pulling the pull rod outward, the rack can be moved away from the toothed ring. At this time, the return spring is in a compressed state. When the rack and toothed ring separate, the rotary heat exchanger can be rotated. When the rotary heat exchanger rotates to a certain angle, the pull rod is released, the return spring releases energy, and pushes the rack to re-engage with the toothed ring, thus fixing the angular position of the rotary heat exchanger. The overall operation is convenient. Attached Figure Description

[0025] Figure 1 This is one of the schematic diagrams of the overall structure of the rotary heat exchanger of the present invention;

[0026] Figure 2 This is the second schematic diagram of the overall structure of the rotary heat exchanger of the present invention;

[0027] Figure 3 This is the third schematic diagram of the overall structure of the rotary heat exchanger of the present invention;

[0028] Figure 4 This is a partial structural diagram of the rotary heat exchanger of the present invention;

[0029] Figure 5 This is a schematic diagram illustrating the working principle of the rotating mechanism of the present invention;

[0030] Figure 6 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A;

[0031] Figure 7 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B;

[0032] Figure 8 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C;

[0033] Figure 9 For the present invention Figure 5 An enlarged schematic diagram of the structure at point D.

[0034] In the diagram: 1. Mounting frame; 101. Placement slot; 2. Filter frame; 201. U-shaped clamp; 3. U-shaped frame; 4. Fixing assembly; 401. L-shaped support block; 402. Connecting plate; 403. Drive screw; 404. Handle; 5. Rotating mechanism; 501. Fixing tube; 502. End cap; 503. Rotating tube; 504. Bearing component; 505. Fixing base pad; 506. Intermediate sealing gasket; 507. Compression ring; 508. Inner support ring; 509. Fastening bolt; 510. Sealing ring; 511. Compression spring; 6. Combination box; 7. Positioning assembly; 701. Toothed ring; 702. Toothed rack; 703. Pull rod; 704. Return spring; 705. Limiting block; 706. Vertical plate; 707. Base frame; 708. Bidirectional screw; 709. Clamping plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-9 Rotary heat exchangers, including:

[0037] Mounting frame 1, with heat exchange tubes installed inside the mounting frame 1;

[0038] There are two combiner boxes 6, which are fixedly installed at the upper and lower ends of the mounting frame 1 respectively.

[0039] The mounting frame 1 has placement slots 101 on both the front and back sides. A U-shaped frame 3 is provided in the middle of the side wall of the placement slot 101. A filter frame 2 is provided inside the placement slot 101 and inside the U-shaped frame 3. A fixing component 4 is provided in the center of the U-shaped frame 3. A rotating mechanism 5 is provided in the center of the outer surface of the two junction boxes 6.

[0040] The fixing component 4 includes a drive screw 403, which is threadedly connected to the U-shaped bracket 3.

[0041] The rotating mechanism 5 includes a fixed tube 501, one end of which is fixedly connected to the junction box 6 and communicates with the inside of the junction box 6.

[0042] The fixing component 4 also includes an L-shaped support block 401, a connecting plate 402, and a handle 404. The front end of the drive screw 403 is fixedly connected to the handle 404. The end of the drive screw 403 away from the handle 404 passes through the front wall of the U-shaped frame 3 and is rotatably connected to the connecting plate 402. The side of the connecting plate 402 away from the drive screw 403 is fixedly connected to the L-shaped support block 401. A U-shaped locking block 201 that cooperates with the L-shaped support block 401 is set at the center of the front of the filter frame 2 through the fixing plate. When installing the filter frame 2, first... The filter frame 2 is inserted into the U-shaped frame 3 and moves vertically downward. When the U-shaped locking block 201 and the L-shaped support block 401 are engaged, the filter frame 2 is released. Then, the handle 404 is turned to drive the drive screw 403 to rotate synchronously. During the rotation of the drive screw 403, the connecting plate 402 and the L-shaped support block 401 are pushed to move towards the mounting frame 1. Then, the L-shaped support block 401 pushes the filter frame 2 into the placement slot 101 through the U-shaped locking block 201, so that the filter frame 2 can be installed easily and disassembled easily in the future, which is convenient for maintenance.

[0043] The rotating mechanism 5 also includes an end cap 502, a rotating tube 503, and a bearing 504. The end cap 502 is located inside the fixed tube 501 at the end away from the junction box 6. A through hole is provided in the center of the end cap 502. One end of the rotating tube 503 passes through the through hole and extends into the fixed tube 501. The bearing 504 is sleeved on the outer surface of the rotating tube 503 and is press-fitted with the inner wall of the end cap 502. The end of the rotating tube 503 away from the end cap 502 is connected to an external connecting pipe. The end cap 502 facilitates the installation of the rotating tube 503. The bearing 504 is sleeved on the outer side of the rotating tube 503 and the outer ring of the bearing 504 is press-fitted with the inner wall of the end cap 502, which enables a rotatable connection between the rotating tube 503 and the end cap 502.

[0044] The end cap 502 has a retaining plate corresponding to the inner wall of the fixing tube 501 on its outer surface. A fixing base 505 is provided between the outer surface of the end cap 502 and the inner wall of the fixing tube 501 through the retaining plate. A middle sealing gasket 506 is provided on the front of the fixing base 505. Two compression rings 507 are provided on the side of the middle sealing gasket 506 away from the fixing base 505, forming a compression groove between the two compression rings 507. An inner support ring 508 is provided inside the compression rings 507. A fastening bolt 509 is provided at the middle of the middle sealing gasket 506 and the inner support ring 508. Ring 508 is inserted into the extrusion groove by fastening bolt 509. With the fixed bottom pad 505 and the intermediate sealing pad 506, the sealing between the fixed tube 501 and the end cap 502 can be effectively guaranteed. By rotating the fastening bolt 509, the inner support ring 508 is moved into the extrusion groove. Then, the inner support ring 508 squeezes the extrusion rings 507 on both sides. The two extrusion rings 507 squeeze the inner wall of the fixed tube 501 and the outer surface of the end cap 502 respectively, so as to ensure the airtightness of the end cap 502 and the stability of the position of the end cap 502.

[0045] The rotating tube 503 has an outer edge on the outer surface of one end inserted into the fixed tube 501. A sealing ring 510 is provided between the inner side of the outer edge of the rotating tube 503 and the side wall of the end cap 502. There are two sealing rings 510, both of which are sleeved on the outer surface of the rotating tube 503. A compression spring 511 is provided between the two sealing rings 510. By providing two sealing rings 510 and a compression spring 511 between them, the compression spring 511 exerts a pushing force on the sealing rings 510 at both ends, thereby ensuring that one sealing ring 510 is in close contact with the inner wall of the outer edge of the rotating tube 503 and the other sealing ring 510 is in close contact with the inner wall of the end cap 502, thus ensuring the sealing between the outer surface of the rotating tube 503 and the end cap 502.

[0046] Among them, a positioning component 7 is provided on the outside of the rotating mechanism 5 located at the lower end of the mounting frame 1. The positioning component 7 includes a toothed ring 701, a rack 702 and a pull rod 703. The toothed ring 701 is fixedly sleeved on the outer surface of the fixed tube 501. The rack 702 is located on one side of the toothed ring 701. The side of the rack 702 away from the toothed ring 701 is fixedly connected to the end of the pull rod 703. By pulling the pull rod 703, the rack 702 can be driven to move synchronously.

[0047] The positioning component 7 also includes a return spring 704, a limiting block 705, a vertical plate 706, and a bottom frame 707. The limiting block 705 is sleeved on the outer surface of the pull rod 703 and slidably connected to the pull rod 703. The return spring 704 is sleeved on the outer surface of the pull rod 703. One end of the return spring 704 is fixedly connected to the rack 702, and the end of the return spring 704 away from the rack 702 is connected to the limiting block 705. The positioning component 7 can be selected for use as needed. By pulling the pull rod 703 outward, the rack 702 can be moved away from the toothed ring 701. At this time, the return spring 704 is in a compressed state. When the rack 702 and the toothed ring 701 separate from each other, the rotary heat exchanger can be rotated. When the rotary heat exchanger rotates to a certain angle, the pull rod 703 is released, the return spring 704 releases energy, and pushes the rack 702 to re-engage with the toothed ring 701, thereby fixing the angle position of the rotary heat exchanger. The overall operation is convenient.

[0048] The vertical plate 706 is fixedly installed at the center of the lower surface of the limiting block 705, and the bottom frame 707 is fixedly installed at the lower end of the vertical plate 706. A rotatable bidirectional screw 708 is installed on the outside of the bottom frame 707 through a mounting bracket. The threads at both ends of the bidirectional screw 708 are in opposite directions. Sliding clamps 709 are installed at both ends of the bottom frame 707 away from the bidirectional screw 708. One end of the clamp 709 passes through the opening of the bottom frame 707 and is threadedly connected to the bidirectional screw 708. The clamp 709 is slidably connected to the inner wall of the opening of the bottom frame 707. By rotating the bidirectional screw 708, under the limiting action of the bottom frame 707, the two clamps 709 can move along the bidirectional screw 708 and move closer to each other. As the two clamps 709 move closer, they can effectively clamp the external connecting pipe connected to the rotating tube 503, thereby fixing the position of the positioning component 7.

[0049] Working principle: When installing filter frame 2, first insert filter frame 2 into U-shaped frame 3 and move it vertically downwards. When U-shaped locking block 201 and L-shaped support block 401 engage, release filter frame 2. Then, rotate handle 404 to drive drive screw 403 to rotate synchronously. During the rotation of drive screw 403, push connecting plate 402 and L-shaped support block 401 towards mounting frame 1. Then, L-shaped support block 401 pushes filter frame 2 into placement slot 101 through U-shaped locking block 201, making filter frame 2 easy to install and easy to disassemble and maintain. The end cover 502 facilitates the installation of rotating tube 503. The outer side of rotating tube 503 is fitted with bearing 504, and the outer ring of bearing 504 is interference-fitted with the inner wall of end cover 502, which enables rotatable connection between rotating tube 503 and end cover 502, allowing the entire heat exchanger to rotate. During rotation, two sealing rings are provided. 510, and a compression spring 511 is provided between the two sealing rings 510. The compression spring 511 exerts a pushing force on the sealing rings 510 at both ends, thereby ensuring that one sealing ring 510 is in close contact with the inner wall of the outer extension of the rotating tube 503, and the other sealing ring 510 is in close contact with the inner wall of the end cap 502, ensuring the sealing between the outer surface of the rotating tube 503 and the end cap 502. By providing a fixed bottom pad 505 and an intermediate sealing pad 506, the sealing between the fixed tube 501 and the end cap 502 can be effectively guaranteed. By rotating the fastening bolt 509, the inner support ring 508 is moved and driven into the compression groove, thereby the inner support ring 508 compresses the compression rings 507 on both sides. The two compression rings 507 respectively compress the inner wall of the fixed tube 501 and the outer surface of the end cap 502, so as to ensure the airtightness of the end cap 502 and the stability of the position of the end cap 502.

[0050] Furthermore, the positioning component 7 can be selected for use as needed. When there are obstructions on both sides of the heat exchanger, by rotating the bidirectional screw 708, under the limiting action of the bottom frame 707, the two clamping plates 709 can move closer to each other along the bidirectional screw 708. As the two clamping plates 709 move closer, they can effectively clamp the external connecting pipe connected to the rotating tube 503, thus fixing the position of the positioning component 7. By pulling the pull rod 703 outward, the rack 702 can be moved away from the toothed ring 701. At this time, the return spring 704 is in a compressed state. When the rack 702 separates from the toothed ring 701, the rotary heat exchanger can be rotated. When the rotary heat exchanger rotates to a certain angle, the pull rod 703 is released, the return spring 704 releases energy, and pushes the rack 702 to re-engage with the toothed ring 701, thus fixing the angle position of the rotary heat exchanger. The overall operation is convenient, and the heat exchanger performance can be used as needed.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary heat exchanger, including: The mounting frame (1) is provided with heat exchange tubes inside the mounting frame (1); There are two junction boxes (6), which are fixedly installed at the upper and lower ends of the mounting frame (1). The feature is that the mounting frame (1) has a placement slot (101) on both the front and back sides, a U-shaped frame (3) is provided at the middle of the side wall of the placement slot (101), a filter frame (2) is provided inside the placement slot (101) and located inside the U-shaped frame (3), a fixing component (4) is provided at the center of the U-shaped frame (3), and a rotating mechanism (5) is provided at the center of the outer surface of the two junction boxes (6). The fixing component (4) includes a drive screw (403), which is threadedly connected to the U-shaped frame (3). The rotating mechanism (5) includes a fixed tube (501), one end of which is fixedly connected to the junction box (6) and communicates with the inside of the junction box (6); The rotating mechanism (5) also includes an end cap (502), a rotating tube (503), and a bearing (504). The end cap (502) is located inside the fixed tube (501) at the end away from the junction box (6). The end cap (502) has a through hole in the center. One end of the rotating tube (503) passes through the through hole and extends into the fixed tube (501). The bearing (504) is sleeved on the outer surface of the rotating tube (503) and is press-fitted with the inner wall of the end cap (502). The end of the rotating tube (503) away from the end cap (502) is connected to an external connecting pipe. The rotating tube (503) is inserted into the fixed tube (501) and has an outer extension edge on its outer surface. A sealing ring (510) is provided between the inner side of the outer extension edge of the rotating tube (503) and the side wall of the end cap (502). There are two sealing rings (510), and both sealing rings (510) are sleeved on the outer surface of the rotating tube (503). A compression spring (511) is provided between the two sealing rings (510).

2. The rotary heat exchanger according to claim 1, characterized in that, The fixing component (4) also includes an L-shaped support block (401), a connecting plate (402) and a handle (404). The front end of the drive screw (403) is fixedly connected to the handle (404), and the end of the drive screw (403) away from the handle (404) passes through the front wall of the U-shaped frame (3) and is rotatably connected to the connecting plate (402).

3. The rotary heat exchanger according to claim 2, characterized in that, The connecting plate (402) is fixedly connected to the L-shaped support block (401) on the side away from the drive screw (403). The filter frame (2) has a U-shaped card block (201) that cooperates with the L-shaped support block (401) through a fixing plate at the center of the front.

4. The rotary heat exchanger according to claim 1, characterized in that, A retaining platform is provided on the outer surface of the end cap (502) at a position corresponding to the inner wall of the fixing tube (501). A fixing base pad (505) is provided between the outer surface of the end cap (502) and the inner wall of the fixing tube (501) through the retaining platform. An intermediate sealing gasket (506) is provided on the front side of the fixing base pad (505). Two compression rings (507) are provided on the side of the intermediate sealing gasket (506) away from the fixing base pad (505).

5. The rotary heat exchanger according to claim 4, characterized in that, An extrusion groove is formed between the two extrusion rings (507). An inner support ring (508) is provided on the inner side of the extrusion ring (507). A fastening bolt (509) is provided at the middle end of the intermediate sealing gasket (506) and the inner support ring (508). The inner support ring (508) is inserted into the extrusion groove by the fastening bolt (509).

6. The rotary heat exchanger according to claim 1, characterized in that, A positioning component (7) is provided on the outside of the rotating mechanism (5) located at the lower end of the mounting frame (1). The positioning component (7) includes a toothed ring (701), a rack (702) and a pull rod (703). The toothed ring (701) is fixedly sleeved on the outer surface of the fixing tube (501). The rack (702) is located on one side of the toothed ring (701). The side of the rack (702) facing away from the toothed ring (701) is fixedly connected to the end of the pull rod (703).

7. The rotary heat exchanger according to claim 6, characterized in that, The positioning component (7) further includes a return spring (704), a limiting block (705), a vertical plate (706), and a bottom frame (707). The limiting block (705) is sleeved on the outer surface of the pull rod (703) and slidably connected to the pull rod (703). The return spring (704) is sleeved on the outer surface of the pull rod (703). One end of the return spring (704) is fixedly connected to the rack (702), and the end of the return spring (704) away from the rack (702) is connected to the limiting block (705).

8. The rotary heat exchanger according to claim 7, characterized in that, The vertical plate (706) is fixedly set at the center of the lower surface of the limiting block (705). The bottom frame (707) is fixedly set at the lower end of the vertical plate (706). A rotatable bidirectional screw (708) is set on the outside of the bottom frame (707) through a mounting bracket. The threads at both ends of the bidirectional screw (708) are in opposite directions. Sliding clamps (709) are set on both ends of the bottom frame (707) away from the bidirectional screw (708). One end of the clamp (709) passes through the opening of the bottom frame (707) and is threadedly connected to the bidirectional screw (708). The clamp (709) is slidably connected to the inner wall of the opening of the bottom frame (707).

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