A hot-pressing sintering furnace for processing ceramic products

Abstract

The present disclosure relates to the technical field of hot-pressing sintering furnace, and one embodiment of the present disclosure provides a hot-pressing sintering furnace for ceramic product processing, which comprises conveying frames, supporting assemblies and folding assemblies. The conveying frames are provided in two, and the two conveying frames are arranged on the side of the furnace body through conveying assemblies, and the top end of the conveying frame is provided with a clamping assembly. The supporting assemblies are arranged on the side of the furnace body and used for supporting the conveying assemblies and molds containing ceramic powder. The folding assemblies are arranged on the furnace body and used for folding the conveying assemblies and conveying frames after the ceramic powder is placed in the furnace body. Through the above technical solution, the technical problem that the mold containing ceramic powder needs to be manually taken out of the furnace body by means of tools and manually taken out of the furnace body is solved, which is relatively troublesome and has the risk of scalding.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of hot pressing sintering furnace technology, and more specifically, to a hot pressing sintering furnace for processing ceramic products. Background Technology

[0002] Ceramics are a class of solid materials made from inorganic non-metallic materials through processes such as high-temperature sintering. They have a wide variety, unique properties, and a broad market of applications. When preparing ceramics, a hot pressing sintering furnace is usually used. The ceramic powder is placed in the furnace and heated by electric heating wires inside the furnace until it reaches the critical temperature. After heating, pressure is applied to the powder through a hydraulic system, causing the ceramic powder to melt, diffuse, and rearrange under high temperature and high pressure, thereby achieving densification sintering and forming solid ceramic products.

[0003] When placing ceramic powder into the furnace, the powder is usually first placed into a mold, and then the mold is placed into the furnace. This allows for some restriction of the powder. After high-temperature heating, when pressure needs to be applied, the pressure plate can fall directly into the mold to apply pressure to the ceramic powder inside the mold, which is quite targeted.

[0004] Existing molds are usually detachable and installed inside the furnace body, which makes it easy to remove the mold when ceramic powder is placed inside. This avoids the inner wall of the furnace body obstructing the workers' hands when ceramic powder is placed inside the furnace. After sintering, the mold is also removed from the furnace body for subsequent processing.

[0005] When placing and removing molds, workers usually handle them manually. Because the temperature is high after sintering, workers need to wear heat-resistant gloves to handle them, or use clamps to hold the molds and remove them. Both methods require manual handling, which is quite troublesome. Furthermore, even with the help of tools and gloves, there is still a risk of burns when workers put their arms into the furnace to handle the molds. Summary of the Invention

[0006] To overcome the above-mentioned defects, embodiments of this disclosure provide a hot pressing sintering furnace for ceramic product processing, which solves the technical problem in the prior art that when placing and removing molds containing ceramic powder from the furnace body, manual removal with the aid of tools is required, which is troublesome and poses a risk of burns.

[0007] According to one aspect, at least one embodiment of this disclosure provides a hot pressing sintering furnace for processing ceramic products, including a furnace body, a placement rack installed inside the furnace body, a furnace door hinged to the side of the furnace body, and a conveying rack, a support assembly, and a take-up and release assembly. Two conveying racks are provided, each connected to the side of the furnace body via a conveying assembly, and a clamping assembly is provided at the top of each conveying rack. The support assembly is located on the side of the furnace body for supporting the conveying assembly and a mold for holding ceramic powder. The take-up and release assembly is located on the furnace body for taking up and releasing the conveying assembly and the conveying rack after the ceramic powder is placed into the furnace body. Furthermore, the conveying assembly includes a support cover, a drive screw, a first motor, a sliding rod, and a connecting rod. The support covers are rotatably mounted on both sides of the furnace body via rotating shafts. The drive screw is rotatably mounted inside one of the support covers, and a threaded moving block passes through the drive screw. One of the conveying frames is fixedly mounted on the moving block. The first motor is mounted on the support cover, and its output end is coaxially connected to the drive screw. The sliding rod is fixedly mounted on the other support cover, and a slider is slidably mounted on the sliding rod. Another conveying frame is fixedly mounted on the slider. A connecting rod is fixedly mounted on the sides of both support covers.

[0008] Furthermore, the support assembly includes a first electric cylinder, a support frame, and a stabilizing component. There are two first electric cylinders, both of which are installed on the side of the furnace body. The support frame is U-shaped, and the bottom end of the support frame is fixedly connected to the output ends of the two first electric cylinders. The stabilizing component is disposed on the support frame.

[0009] Furthermore, the stabilizing component includes a stabilizing rod, a slide rail, and an electromagnet. The stabilizing rod is slidably mounted through both sides of the support frame, and the slide rail is fixedly mounted on both sides of the support frame. The bottom end of the stabilizing rod is slidably mounted in the slide groove of the slide rail via a sliding rod. Two electromagnets are provided, and the two electromagnets are respectively fixedly mounted on both sides of the two stabilizing rods.

[0010] Furthermore, the clamping assembly includes a protective cover, a second electric cylinder, and a clamping ring. The protective cover is detachably installed on the top of both conveyor frames. There are two second electric cylinders, which are respectively installed on the two protective covers. The clamping ring is fixedly installed on the output end of the second electric cylinder. The curvature of the inner sidewall of the clamping ring is consistent with the curvature of the outer sidewall of the mold, and an anti-slip pad is installed on the inner sidewall of the clamping ring.

[0011] Furthermore, the retracting assembly includes a second motor, a drive gear ring, a drive gear, and a pulling assembly. The second motor is mounted on the side of the furnace body via a mounting bracket. The drive gear ring is fixedly mounted on one of the rotating shafts. The drive gear is coaxially connected to the output end of the second motor, and the drive gear ring meshes with the drive gear. The pulling assembly is located at the top of the furnace body.

[0012] Furthermore, the pulling assembly includes a mounting block, a pull rope, a pull hook, and a pulling frame. Two mounting blocks are fixedly installed on the top of the furnace body, the pull rope is fixedly installed on the side of the mounting block, the pull hook is fixedly installed on the other end of the pull rope, and two pulling frames are fixedly installed on the side of the connecting rod.

[0013] In order to enable the mold to be placed directly onto the top of the placement rack when it is moved, the top of the stabilizing rod is at the same horizontal position as the top of the placement rack.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: 1. In this disclosure, when placing ceramic powder into the mold, the mold can first be placed by the support component, and at this time the support component supports the conveying component. When tilting, the mold is clamped and fixed by the clamping component. After tilting is completed, the mold containing ceramic powder is moved to the placement rack inside the furnace by the conveying component. Then the conveying component is rotated and lifted by the take-up and release component. Then the furnace door is closed, thereby completing the placement of the mold. 2. In this disclosure, after the ceramic powder is sintered, the furnace door is opened, the conveying component is rotated to a horizontal position again by the take-up and release component, and then the clamping component is moved into the furnace to clamp the mold, and then it is moved out, thereby completing the removal of the mold and the ceramic powder; In summary, this hot-press sintering furnace, through the cooperation of the conveyor frame, support components, and loading / unloading components, can automatically place molds containing ceramic powder into the furnace body for processing. After processing, the molds can be removed without manual intervention, which is convenient and safe. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the support component of the present invention; Figure 3 This is a schematic diagram of the structure of the conveying assembly, conveying frame, and fixing rod of the present invention. Figure 4 This is a schematic diagram showing the disassembled assembly of the conveyor frame, fixed rod, moving block, slider, mold, and clamping assembly of the present invention. Figure 5 This is a schematic diagram of the structure of the support cover, connecting rod and retraction assembly of the present invention in an exploded configuration; Figure 6 This is a schematic diagram of the structure of the furnace body, furnace door, and placement rack of the present invention.

[0017] In the diagram: 1. Furnace body; 2. Placement rack; 3. Furnace door; 4. Conveying rack; 5. Mold; 6. Support cover; 7. Rotating shaft; 8. Drive screw; 9. Moving block; 10. First motor; 11. Sliding rod; 12. Connecting rod; 13. First electric cylinder; 14. Support frame; 15. Stabilizing rod; 16. Slide rail; 17. Electromagnet; 18. Protective cover; 19. Second electric cylinder; 20. Clamping ring; 21. Second motor; 22. Drive gear ring; 23. Drive gear; 24. Mounting block; 25. Pull rope; 26. Pull hook; 27. Pulling frame; 28. Fixing rod; 29. ​​Slider. Detailed Implementation

[0018] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0019] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0021] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0023] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] like Figures 1-6 As shown, a hot pressing sintering furnace for ceramic product processing according to an embodiment of the present disclosure is illustrated. It includes a furnace body 1, a placement rack 2 installed inside the furnace body 1, a furnace door 3 hinged to the side of the furnace body 1, a conveying rack 4, a support assembly, and a take-up and put-down assembly. There are two conveying racks 4, both of which are set on the side of the furnace body 1 via the conveying assembly, and a clamping assembly is provided at the top of the conveying rack 4. The support assembly is set on the side of the furnace body 1 to support the conveying assembly and the mold 5 for holding ceramic powder. The take-up and put-down assembly is set on the furnace body 1 to take up and put down the conveying assembly and the conveying rack 4 after the ceramic powder is placed into the furnace body 1.

[0025] like Figure 2As shown, when holding ceramic powder, the conveying assembly is first supported by a support component, and the mold 5 is placed simultaneously. The conveying assembly includes a support cover 6, a drive screw 8, a first motor 10, a sliding rod 11, and a connecting rod 12. Support covers 6 are rotatably mounted on both sides of the furnace body 1 via rotating shafts 7. The drive screw 8 is rotatably mounted inside one of the support covers 6, and a threaded moving block 9 passes through the drive screw 8. One conveying frame 4 is fixedly mounted on the moving block 9. The first motor 10 is mounted on the support cover 6, and its output end is coaxially connected to the drive screw 8. The sliding rod 11 is fixedly mounted on the other support cover 6, and a slider 29 is slidably mounted on the sliding rod 11. Another conveying frame 4 is fixedly mounted on the slider 29. A connecting rod 12 is fixedly installed on the side of the support cover 6. The support assembly includes a first electric cylinder 13, a support frame 14, and a stabilizing component. There are two first electric cylinders 13, both of which are installed on the side of the furnace body 1. The support frame 14 is U-shaped, and the bottom end of the support frame 14 is fixedly connected to the output ends of the two first electric cylinders 13. The stabilizing component is installed on the support frame 14 and includes a stabilizing rod 15, a slide rail 16, and an electromagnet 17. Stabilizing rods 15 are slidably installed through both sides of the support frame 14, and slide rails 16 are fixedly installed on both sides of the support frame 14. The bottom end of the stabilizing rod 15 is slidably installed in the slide groove of the slide rail 16 through a sliding rod. There are two electromagnets 17, which are fixedly installed on both sides of the two stabilizing rods 15 respectively.

[0026] Specifically, the first electric cylinder 13 is activated, and the output end of the first electric cylinder 13 drives the support frame 14 to move upward. At this time, the support cover 6 is in a horizontal position and the furnace door 3 is open. The position of the stabilizing rod 15 on the slide rail 16 is pulled, so that the two stabilizing rods 15 move relative to each other. The electromagnet 17 is activated, and the two electromagnets 17 attract each other, so that the sides of the two stabilizing rods 15 are put together. Then the mold 5 is placed on the top of the two stabilizing rods 15. At this time, the top of the support frame 14 contacts the bottom of the two support covers 6, so as to support the two support covers 6. At this time, the furnace door 3 is in a horizontal open position, located in the middle groove of the support frame 14.

[0027] like Figure 4As shown, after placement, the mold 5 is clamped by a clamping assembly, which includes a protective cover 18, a second electric cylinder 19, and a clamping ring 20. The top of each of the two conveyor frames 4 is detachably equipped with a protective cover 18. There are two second electric cylinders 19, which are respectively installed on the two protective covers 18. The output end of the second electric cylinder 19 is fixedly equipped with a clamping ring 20. The curvature of the inner sidewall of the clamping ring 20 is consistent with the curvature of the outer sidewall of the mold 5, and the inner sidewall of the clamping ring 20 is equipped with an anti-slip pad. Specifically, when the second electric cylinder 19 is activated, the output end of the second electric cylinder 19 drives the clamping ring 20 to move towards the mold 5, so that the clamping ring 20 fits against the mold 5, thereby clamping and fixing the mold 5.

[0028] like Figure 3 As shown, after the clamping ring 20 clamps the mold 5, the first motor 10 is started. The output end of the first motor 10 drives the drive screw 8 to rotate inside the support cover 6, thereby causing the moving block 9 to move backward on the drive screw 8. It should be noted that a fixing rod 28 is fixedly installed between the two conveyor frames 4. Driven by the fixing rod 28, the other conveyor frame 4 moves synchronously on the sliding rod 11 under the sliding of the slider 29, thereby driving the two conveyor frames 4 to move forward, and then moving the clamped mold 5 to the placement frame 2 inside the furnace body 1. Because the top of the stabilizing rod 15 is at the same horizontal position as the top of the placement frame 2, the mold 5 can be directly placed on the placement frame 2 when it contacts the placement frame 2. The moving block 9 stops when it moves to the side of the support cover 6. At this time, the mold 5 is located directly below the pressure component inside the furnace body 1. After placement, the first motor 10 is started again in reverse, driving the conveyor frame 4 to move out of the furnace body 1.

[0029] like Figure 5 As shown, after the conveyor frame 4 moves out of the furnace body 1, the solenoid valve is demagnetized, and then the sliding stabilizing rod 15 is moved to the sides on the slide rail 16. Subsequently, the first electric cylinder 13 is activated, which drives the support frame 14 to move down, causing the top of the support frame 14 to disengage from the bottom of the support cover 6. Finally, the support cover 6 is lifted by the retraction assembly, thereby closing the furnace door 3. The retraction assembly includes a second motor 21, a drive gear ring 22, a drive gear 23, and a pulling assembly. The second motor 21 is mounted on the side of the furnace body 1 via a mounting bracket. The drive gear ring 22 is fixedly installed on one of the rotating shafts 7. The drive gear 23 is coaxially connected to the output end of the second motor 21, and the drive gear ring 22 meshes with the drive gear 23. The pulling assembly is set at the top of the furnace body 1. The pulling assembly includes a mounting block 24, a pull rope 25, a pull hook 26, and a pulling frame 27. Two mounting blocks 24 are fixedly installed at the top of the furnace body 1. A pull rope 25 is fixedly installed on the side of the mounting block 24. A pull hook 26 is fixedly installed at the other end of the pull rope 25. Two pulling frames 27 are fixedly installed on the side of the connecting rod 12.

[0030] Specifically, the second motor 21 is started, and the output end of the second motor 21 drives the drive gear 23 to rotate. The drive gear 23 drives the drive gear ring 22 that meshes with it to rotate. The drive gear ring 22 drives one of the rotating shafts 7 to rotate, thereby driving one of the support covers 6 to rotate. With the connection of the connecting rod 12, the other support cover 6 is driven to rotate on the side of the furnace body 1, so that the other end of the two support covers 6 rotates to the upper side of the furnace body 1. The conveyor frame 4, the clamping ring 20, and the first electric cylinder 13 are rotated synchronously to the top of the furnace body 1, and the hook 26 is hung on the pulling frame 27 to further fix them. At this time, the furnace door 3 is closed, and the furnace body 1 is started to pressurize and sinter the ceramic powder in the mold 5.

[0031] Working principle: When hot pressing and sintering ceramic powder, first open the furnace door 3 and the support cover 6 is in a horizontal position. Start the first electric cylinder 13. The output end of the first electric cylinder 13 drives the support frame 14 to move up to fit the bottom of the support cover 6. Then pull the stabilizing rod 15 on the slide rail 16 to move the two stabilizing rods 15 relative to each other. Start the electromagnet 17. Under the attraction of the two electromagnets 17, the sides of the two stabilizing rods 15 are put together. Then place the mold 5 on the top of the two stabilizing rods 15. After placement, the two clamping rings 20 are located on both sides of the mold 5. Start the second electric cylinder 19. The output end of the second electric cylinder 19 drives the clamping rings 20 to move towards the mold 5, so that the clamping rings 20 fit against the mold 5, thereby clamping and fixing the mold 5.

[0032] After fixing, the first motor 10 is started. The output end of the first motor 10 drives the drive screw 8 to rotate inside the support cover 6, thereby causing the moving block 9 to move backward on the drive screw 8. Driven by the fixed rod 28, the other side of the conveyor frame 4 moves synchronously on the sliding rod 11 under the sliding of the slider 29, thereby driving the two conveyor frames 4 to move forward, and then moving the clamped mold 5 to the placement rack 2 inside the furnace body 1. After placement, the first motor 10 is started again in reverse, driving the conveyor frame 4 to move out of the furnace body 1. Then the second motor 21 is started. The output end of the second motor 21 drives the drive gear 23 to rotate. The drive gear 23 drives the drive gear ring 22 that meshes with it to rotate. The drive gear ring 22 drives one of the rotating shafts 7 to rotate, thereby driving one of the support covers 6 to rotate. With the connection of the connecting rod 12, the other support cover 6 is driven to rotate on the side of the furnace body 1, thereby causing the other end of the two support covers 6 to rotate to the upper side of the furnace body 1. Then the hook 26 is hung on the pulling frame 27 to further fix it.

[0033] like Figure 6As shown, the furnace door 3 is then closed, and the furnace body 1 is started to pressurize and sinter the ceramic powder in the mold 5. The furnace body 1 is equipped with an electric heating wire, which can heat the interior and thus heat the ceramic powder in the mold 5 at high temperature. After heating, the ceramic powder in the mold 5 is pressurized by the hydraulic cylinder at the top of the furnace body 1. The mold 5 is made of high temperature resistant material.

[0034] After the pressure sintering is completed, open the furnace door 3, rotate the support cover 6 in the opposite direction to the horizontal position, and then move the clamping ring 20 into the furnace body 1 to clamp the mold 5. The protective cover 18 can protect the second electric cylinder 19 and block the high temperature. After clamping the mold 5, start the first motor 10 to move it out. Before that, start the first electric cylinder 13 to move the support frame 14 up to fit the bottom of the support cover 6 and continue to pull the stabilizing rod 15 so that the sides of the two stabilizing rods 15 fit together. Place the moved mold 5 on the top of the stabilizing rod 15. It should be noted that the stabilizing rod 15 and the clamping ring 20 are both made of high temperature resistant material.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A hot pressing sintering furnace for processing ceramic products, comprising a furnace body (1), a placement rack (2) installed inside the furnace body (1), and a furnace door (3) hinged to the side of the furnace body (1), characterized in that, Also includes: Conveyor frame (4), two conveyor frames (4) are provided, both conveyor frames (4) are provided on the side of the furnace body (1) through conveying components, and a clamping component is provided at the top of the conveyor frame (4); A support assembly is provided on the side of the furnace body (1) for supporting the conveying assembly and the mold (5) for holding ceramic powder. A take-up and release assembly is disposed on the furnace body (1) and is used to take up and release the conveying assembly and the conveying frame (4) after the ceramic powder is placed into the furnace body (1); The conveying assembly includes: Support cover (6), the support cover (6) is rotatably installed on both sides of the furnace body (1) via a rotating shaft (7); A drive screw (8) is rotatably mounted inside one of the support covers (6), and a threaded moving block (9) passes through the drive screw (8), on which one of the conveyor frames (4) is fixedly mounted. The first motor (10) is mounted on the support cover (6), and the output end of the first motor (10) is coaxially connected to the drive screw (8); A sliding rod (11) is fixedly mounted on another support cover (6), and a slider (29) is slidably mounted on the sliding rod (11), and another conveyor frame (4) is fixedly mounted on the slider (29). A connecting rod (12) is fixedly installed on the side of each of the two support covers (6). The support components include: Two first electric cylinders (13) are provided, and both first electric cylinders (13) are installed on the side of the furnace body (1); The support frame (14) is U-shaped and the bottom end of the support frame (14) is fixedly connected to the output ends of the two first electric cylinders (13); A stabilizing component is disposed on the support frame (14); The stabilizing component includes: Stabilizing rod (15), the stabilizing rod (15) is slidably installed through both sides of the support frame (14). The slide rail (16) is fixedly installed on both sides of the support frame (14), and the bottom end of the stabilizing rod (15) is slidably installed in the groove of the slide rail (16) through the slide rod; Electromagnet (17), two electromagnets (17) are provided, and the two electromagnets (17) are respectively fixedly installed on both sides of the two stabilizing rods (15).

2. The hot pressing sintering furnace for processing ceramic products according to claim 1, characterized in that, The clamping assembly includes: Protective cover (18) can be detachably installed on the top of both conveyor frames (4). There are two second electric cylinders (19), and the two second electric cylinders (19) are respectively installed on the two protective covers (18); The clamping ring (20) is fixedly installed at the output end of the second electric cylinder (19). The curvature of the inner sidewall of the clamping ring (20) is consistent with the curvature of the outer sidewall of the mold (5), and the inner sidewall of the clamping ring (20) is equipped with an anti-slip pad.

3. The hot pressing sintering furnace for ceramic product processing according to claim 2, characterized in that, The retraction / extension component includes: The second motor (21) is mounted on the side of the furnace body (1) via a mounting bracket; A drive gear ring (22) is fixedly mounted on one of the rotating shafts (7); A drive gear (23) is coaxially connected to the output end of the second motor (21), and the drive gear ring (22) meshes with the drive gear (23); A pull assembly is disposed at the top of the furnace body (1).

4. The hot pressing sintering furnace for ceramic product processing according to claim 3, characterized in that, The pulling component includes: Mounting blocks (24), two of the mounting blocks (24) are fixedly installed on the top of the furnace body (1). Pull rope (25), the pull rope (25) is fixedly installed on the side of the mounting block (24); A hook (26) is fixedly installed at the other end of the pull rope (25); Pulling frame (27), two of the pulling frames (27) are fixedly installed on the side of the connecting rod (12).

5. A hot pressing sintering furnace for processing ceramic products according to claim 4, characterized in that, The top of the stabilizing rod (15) is at the same horizontal position as the top of the placement frame (2).

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