Forming machine for metal powder processing

Abstract

The invention relates to the technical field of metal powder machining, in particular to a metal powder machining forming machine which comprises a workbench and a lower die mechanism installed in the workbench, an ejector rod assembly is arranged in the bottom face of the lower die mechanism in a penetrating mode, and two discharging openings are symmetrically formed in the outer side of the upper portion of the ejector rod assembly. The lower end of the ejector rod assembly and a supporting plate in the workbench are installed in a penetrating mode, a lifting control mechanism is installed below the supporting plate, the lower end of the ejector rod assembly is connected with a conveying assembly used for conveying metal powder, and an automatic rotation control assembly is installed on the outer side of the lower end of the ejector rod assembly. And a forming part which is ejected out through an ejector rod assembly is arranged above the lower die mechanism. According to the forming machine for metal powder processing, the forming part in the lower die mechanism is conveniently ejected upwards by the ejector rod assembly, and metal powder is injected into the lower die mechanism through the discharging opening, so that the time spent on the whole compression molding processing is shortened, and the compression molding processing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal powder processing, in particular to a forming machine for metal powder processing. Background Art

[0002] Metal powder is composed of a large number of tiny metal particles. Using a molding machine, metal powder can be pressed into metal parts of a certain shape through a specific mold. This not only improves the production efficiency of metal parts, but also facilitates the manufacture of various complex metal parts. Therefore, it is widely used in various industries;

[0003] The patent name disclosed in the prior art with announcement number "CN116727666A" is "A New Metal Powder Processing and Molding Machine", which discloses that the inner wall of the external threaded sleeve is fixedly connected to the outer wall of the punch head, and the outer wall of the external threaded sleeve is threadedly connected with a circular ring. The external threaded sleeve is used to play a role of relative rotation with the circular ring through a thread when descending, and a groove is opened on the inner wall of the circular ring. The outer wall of the circular ring is fixedly connected with a fan blade, and a threaded groove is opened on the inner wall of the circular ring. The groove is used to play a role of smooth circulation of air and dust. Pour metal powder into the mold, and then start the electric lifting rod inside the stamping and molding machine. The electric lifting rod is automatically telescopic and lifted, so that it descends to push the connecting plate and the punch head at the bottom of the connecting plate to descend to stamp the metal powder inside the mold, and the mold is continuously heated by the bottom plate and the high-temperature heating machine at the bottom to stamp it into the mold. With the high temperature and high pressure solid molding , and the patent name disclosed in the prior art with the announcement number "CN118951018B" is "A molding device for metal powder processing", which discloses that when in use, under the action of the driving member, the material receiving barrel moves to the bottom of the output end of the feeding mechanism to receive the material, and the feeding mechanism discharges the metal powder into the material receiving barrel. During this process, the metal powder will be filtered through the filter plate, and the metal materials with larger particles will remain on the filter plate. Then, under the resetting action of the driving member, the material receiving barrel is driven to move to one side of the molding cavity, so that the metal powder in the material receiving barrel falls into the molding cavity, preparing for the subsequent metal powder pressing and molding. Then, under the action of the driving member, the material receiving barrel is moved again to the bottom of the output end of the feeding mechanism to receive the material. At the same time, the first electric push rod drives the extrusion plate to slide into the molding cavity to achieve the effect of extruding the metal powder. Then, after the first electric push rod is retracted and reset, the ejection mechanism ejects the molded part.

[0004] When the metal powder processing forming machine in the above-mentioned prior art is used, the formed part is first ejected by the ejection mechanism, and then the metal powder is injected into the forming cavity through the receiving tube to prepare for the subsequent metal powder pressing and molding. This operation is repeated, so that only after the formed part is ejected, can the metal powder be injected again for molding. The molded part cannot be ejected and the injection operation cannot be performed at the same time. Therefore, the molding process takes a long time, which makes the molding process less efficient. Therefore, we propose a metal powder processing forming machine to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a molding machine for metal powder processing to solve the problem raised in the above background technology that the molding machines currently on the market cannot eject the molded parts while performing the injection operation, which results in a long time spent on the molding process and a low efficiency of the molding process.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a forming machine for metal powder processing, comprising a workbench and a lower mold mechanism installed inside the workbench, an upper mold mechanism is arranged directly above the lower mold mechanism, the upper part of the upper mold mechanism is connected to the output end of the cylinder body, the upper end of the cylinder body is connected to the workbench, a push rod assembly is penetrated inside the bottom surface of the lower mold mechanism, two discharge ports are symmetrically opened on the upper outer side of the push rod assembly, the lower end of the push rod assembly is penetrated and installed with a support plate in the workbench, a lifting control mechanism is installed below the support plate, the lower end of the push rod assembly is connected to a conveying assembly for conveying metal powder, an automatic rotation control assembly is installed on the outer side of the lower end of the push rod assembly, and a forming component ejected by the push rod assembly is arranged above the lower mold mechanism.

[0007] Preferably, a bearing frame is installed in a groove inside the front side of the workbench.

[0008] Preferably, the lifting control mechanism includes an electric push rod installed on the bottom surface of the support plate, and the four corners of the support plate are all penetrated by sliding connection limit columns, and the lower end of the electric push rod and the lower end of the limit column are both connected to the inside of the workbench.

[0009] Preferably, the conveying assembly includes an external feeding tube connected to the lower end bearing of the push rod assembly, the external feeding tube is made of a hose material, the interior of the push rod assembly is hollow, the bottom end of the push rod assembly is open, the top of the push rod assembly is solid, and a powder flow meter is installed inside the bottom of the push rod assembly.

[0010] Preferably, the automatic rotation control assembly includes a connecting rope wound around the outer side of the lower side of the push rod assembly, the lower end of the connecting rope passes through the interior of the support plate through a guide wheel and is connected to the inner wall of the workbench, the guide wheel is installed on the upper surface of the support plate, and a vortex spring is nested and connected to the outer side of the corresponding push rod assembly above the support plate, and one end of the vortex spring is connected to the support plate.

[0011] Preferably, a cross bar is installed in a groove inside the workbench corresponding to the rear side of the lower mold mechanism, and a connecting spring is nested and connected to the outer side of one end of the cross bar.

[0012] Preferably, an arc-shaped push plate is provided on the rear side of the forming component, a moving frame is installed on the rear side of the push plate, and support frames with a "7"-shaped structure are installed on both left and right sides of the rear of the moving frame, and a cross bar is provided through the lower interior of the support frame.

[0013] Preferably, a vertical rod is fixed on the upper rear side of the support plate, and the upper end of the vertical rod passes through the interior of the workbench.

[0014] Preferably, a regulating groove is provided inside the bottom surface of the movable frame, the front side surface of the regulating groove is arranged in an inclined shape, the upper end of the vertical rod is arranged below the front side surface of the regulating groove, and the movable frame forms a front-and-rear sliding structure through the vertical rod.

[0015] Preferably, an air storage column is installed in a groove inside the front side surface of the movable frame, a piston mechanism is slidably arranged inside the air storage column, a detection column is fixed to the front end of the piston mechanism, the front end of the detection column passes through the middle of the push plate, and an air storage airbag with a cylindrical structure is embedded and installed in the groove inside the upper surface of the movable frame, the space inside the air storage airbag is connected with the space inside the air storage column through a connecting pipe installed inside the movable frame, a horizontal plate is arranged above the movable frame, the rear side of the horizontal plate is connected to the workbench, and a row of protrusions are installed on the bottom surface of the horizontal plate, and the lowest point of the protrusions is lower than the highest point of the air storage airbag.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the molding machine for metal powder processing facilitates the ejector assembly to eject the molding component in the lower mold mechanism upward while injecting metal powder into the lower mold mechanism through the discharge port, thereby shortening the time spent on the entire molding process and improving the efficiency of the molding process. The specific contents are as follows:

[0017] (1) By setting the interior of the ejector assembly to be hollow and opening a feed opening on the upper outer side of the ejector assembly, it is convenient for metal powder to enter the ejector assembly through the feeding external pipe, and then the ejector assembly can eject the molded component in the lower mold mechanism upward while injecting metal powder into the lower mold mechanism through the feed opening, thereby shortening the time spent on the entire compression molding process and improving the efficiency of the compression molding process;

[0018] Furthermore, by setting the connecting rope, the push rod assembly can move up and down while rotating automatically, so that the discharge port on the outer side above the push rod assembly can evenly inject the metal powder into the interior of the lower mold mechanism, so as to facilitate the subsequent compression molding process.

[0019] (2) The upwardly moving vertical rod cooperates with the regulating groove to automatically move the moving frame and the push plate forward, thereby facilitating the push plate to exert a forward thrust on the molded component, so that the molded component moves to the carrying frame for placement;

[0020] (3) As the moving frame and the push plate move forward, a row of protrusions intermittently squeeze the air storage bag, so that the air storage bag reciprocates to inject air into the air storage column, so that the detection column in the air storage column can move back and forth, and then the detection column can reciprocately knock on the molded component to detect whether the molded component is easy to loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional structural schematic diagram of the left side of the workbench of the present invention;

[0023] Figure 3 It is a left sectional structural schematic diagram of the connection between the lower mold mechanism and the workbench of the present invention;

[0024] Figure 4 This is a bottom view of the structure of the support plate of the present invention;

[0025] Figure 5 It is a schematic cross-sectional structure diagram of the lower mold mechanism of the present invention;

[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the push rod assembly of the present invention after it is lowered;

[0027] Figure 7 It is a schematic diagram of the structure of the mandrel assembly and the connecting rope being separated according to the present invention;

[0028] Figure 8 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0029] Fig. 9 It is a schematic diagram of the cross-sectional structure of the movable frame of the present invention;

[0030] Fig.10 It is a schematic diagram of the cross-sectional structure of the gas storage column of the present invention.

[0031] In the figure: 1. workbench; 2. lower mold mechanism; 3. cylinder body; 4. upper mold mechanism; 5. bearing frame; 6. molding component; 7. horizontal plate; 8. support frame; 9. support plate; 10. vertical rod; 11. limit column; 12. electric push rod; 13. feeding external tube; 14. push rod assembly; 141. feeding port; 15. powder flow meter; 16. connecting rope; 17. vortex spring; 18. moving frame; 181. regulating groove; 19. horizontal rod; 191. connecting spring; 20. push plate; 21. detection column; 211. piston mechanism; 22. air storage bag; 23. connecting pipe; 24. bump; 25. air storage column. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 10 , the present invention provides the following technical solutions:

[0034] Embodiment 1: The metal powder processing forming machine in this embodiment can eject the forming component 6 upward while injecting the metal powder, thereby improving the efficiency of the compression molding process. The specific structure is shown in the attached Figure 1-Figure 8 As shown, it includes a workbench 1, and a lower mold mechanism 2 installed inside the workbench 1, an upper mold mechanism 4 is arranged directly above the lower mold mechanism 2, the upper end of the upper mold mechanism 4 is connected to the output end of the cylinder body 3, the upper end of the cylinder body 3 is connected to the workbench 1, and a push rod assembly 14 is arranged inside the bottom surface of the lower mold mechanism 2, and two discharge ports 141 are symmetrically provided on the upper outer side of the push rod assembly 14, the lower end of the push rod assembly 14 is installed through the support plate 9 in the workbench 1, and a lifting control mechanism is installed below the support plate 9. The lower end of the rod assembly 14 is connected to a conveying assembly for conveying metal powder, an automatic rotation control assembly is installed on the outer side of the lower end of the push rod assembly 14, a forming component 6 ejected by the push rod assembly 14 is arranged above the lower mold mechanism 2, a bearing frame 5 is installed in a groove inside the front side of the workbench 1, and the lifting control mechanism includes an electric push rod 12 installed on the bottom surface of the support plate 9, and the four corners of the support plate 9 are all penetrated by the limiting column 11 that is slidably connected, and the lower end of the electric push rod 12 and the lower end of the limiting column 11 are both connected to the inside of the workbench 1.

[0035] The conveying assembly includes a feeding external pipe 13 connected to the bearing at the lower end of the ejector assembly 14, the feeding external pipe 13 is made of a hose material, the interior of the ejector assembly 14 is hollow, the bottom end of the ejector assembly 14 is open, the top of the ejector assembly 14 is solid, and a powder flow meter 15 is installed inside the lower part of the ejector assembly 14. The automatic rotation control assembly includes a connecting rope 16 wound around the outer side of the lower part of the ejector assembly 14, the lower end of the connecting rope 16 passes through the interior of the support plate 9 through a guide wheel and is connected to the inner wall of the workbench 1, the guide wheel is installed on the upper surface of the support plate 9, and a vortex spring 17 is nested and connected to the outer side of the ejector assembly 14 corresponding to the upper part of the support plate 9, and one end of the vortex spring 17 is connected to the support plate 9, and the lower mold mechanism 2 A cross bar 19 is installed in the internal groove of the workbench 1 corresponding to the rear side, and a connecting spring 191 is nested and connected to the outer side of one end of the cross bar 19, an arc-shaped push plate 20 is arranged on the rear side of the forming component 6, and a moving frame 18 is installed on the rear side of the push plate 20, and a support frame 8 with a "7"-shaped structure is installed on the left and right sides of the rear of the moving frame 18, and a cross bar 19 is arranged through the lower interior of the support frame 8, and a vertical rod 10 is fixed on the upper rear side of the support plate 9, and the upper end of the vertical rod 10 passes through the interior of the workbench 1, and an adjustment groove 181 is opened inside the bottom surface of the moving frame 18, and the front side surface of the adjustment groove 181 is arranged in an inclined shape, and the upper end of the vertical rod 10 is arranged below the front side surface of the adjustment groove 181, and the moving frame 18 forms a front and rear sliding structure through the vertical rod 10.

[0036] First, connect the feeding external pipe 13 made of a hose material to the external powder conveying pump body, and then convey the metal powder through the feeding external pipe 13 to the ejector rod assembly 14 with a hollow interior through the powder conveying pump body. At this time, the powder flow meter 15 detects the flow rate of the powder, and then starts the electric push rod 12, which drives the support plate 9 to move upward. At this time, the support plate 9 stably moves upward on the outside of the limit column 11, so that the support plate 9 stably drives the ejector rod assembly 14 to move upward. At this time, the metal powder in the ejector rod assembly 14 flows outward from the discharge port 141 into the lower mold mechanism 2. At the same time, when the ejector rod assembly 14 moves upward, the lower end of the connecting rope 16 is pulled, so that the connecting rope 16 drives the ejector rod assembly 14 to rotate. The lower end of the ejector rod assembly 14 is connected to the upper end of the feeding external pipe 13 through a sealed bearing. The outer side of the lower end of the component 14 is connected to the inside of the support plate 9 through a bearing, so the stable rotation of the push rod assembly 14 can be ensured. At this time, the vortex spring 17 accumulates force. Therefore, when the push rod assembly 14 rises and rotates at the same time, the metal powder can flow evenly into various positions in the lower mold mechanism 2, which is convenient for uniform material discharge. When the powder flow meter 15 detects that the flow rate reaches a certain value, the powder flow meter 15 can transmit this signal to the central processing module, and the central processing module controls the powder conveying pump body to stop conveying (since this part is the existing technology, it will not be introduced in detail here). At this time, the support plate 9 is driven downward by the electric push rod 12, so that the upper end of the push rod assembly 14 moves downward to the lower inside of the lower mold mechanism 2. At this time, the highest point of the push rod assembly 14 is on the same horizontal plane as the highest point of the bottom inner wall of the lower mold mechanism 2.

[0037] Then start the cylinder body 3, so that the output end of the cylinder body 3 drives the upper mold mechanism 4 to move downward, and then the upper mold mechanism 4 enters the lower mold mechanism 2 to mold the metal powder, so that the metal powder becomes a molded component 6. After a period of extrusion, the cylinder body 3 drives the upper mold mechanism 4 to move upward, and then as shown above, the electric push rod 12 drives the support plate 9 and the ejector assembly 14 to move upward. At this time, the upper end of the ejector assembly 14 ejects the molded component 6 inside the lower mold mechanism 2 upward. At the same time, the ejector assembly 14 moves upward while rotating, so that the metal powder in the ejector assembly 14 is well injected into various positions of the lower mold mechanism 2 through the discharge port 141. When the upper end of the ejector assembly 14 moves to the uppermost position of the lower mold mechanism 2, the vertical rod 10 above the rear side of the support plate 9 enters the regulating groove 181 in the moving frame 18. Since the front side of the regulating groove 181 is inclined, the rising vertical rod 10 will apply a forward thrust to the moving frame 18, and the moving frame 18 will drive the push plate 20 to move forward. At this time, the support frames 8 on the left and right sides of the moving frame 18 slide on the outside of the cross bar 19, and the connecting spring 191 is used to store force to ensure that the push plate 20 moves forward stably. At this time, when the push plate 20 moves to contact the rear side of the forming component 6, it will push the forming component 6 forward, so that the forming component 6 moves to the supporting frame 5, and then the push rod assembly 14 moves downward, and the upper mold mechanism 4 again molds the metal powder in the lower mold mechanism 2. This operation is repeated, and the demolding operation can be performed while the injection operation is performed, thereby improving the efficiency of the entire molding and shortening the processing time. Later, the molding component 6 on the supporting frame 5 can be taken down by a robot or manually.

[0038] Embodiment 2: The metal powder processing forming machine in this embodiment, based on the embodiment 1, can perform reciprocating knocking on the forming component 6 to detect whether the forming component 6 is easy to loosen. The specific structure is shown in the attached Figure 9-10As shown, an air storage column 25 is installed in a groove inside the front side of the moving frame 18, and a piston mechanism 211 is slidably arranged inside the air storage column 25. A detection column 21 is fixed to the front end of the piston mechanism 211, and the front end of the detection column 21 passes through the middle of the push plate 20. An air storage airbag 22 with a cylindrical structure is embedded in the groove on the upper surface of the moving frame 18. The space inside the air storage airbag 22 is connected to the space inside the air storage column 25 through a connecting pipe 23 installed inside the moving frame 18. A horizontal plate 7 is arranged above the moving frame 18, and the rear side of the horizontal plate 7 is connected to the workbench 1. A row of protrusions 24 are installed on the bottom surface of the horizontal plate 7, and the lowest point of the protrusion 24 is lower than the highest point of the air storage airbag 22. When the moving frame 18 moves forward, the air storage airbag 22 above the moving frame 18 will contact with a row of protrusions 24 installed at equal intervals in turn, so that the row of protrusions 24 reciprocate to the storage The airbag 22 is squeezed, and the gas in the squeezed air storage bag 22 enters the air storage column 25 through the connecting tube 23, and then the gas in the air storage column 25 applies a forward thrust to the piston mechanism 211 and the detection column 21, so that the front end of the detection column 21 penetrates the interior of the pushing plate 20 and knocks the rear side of the forming component 6. When the protrusion 24 does not squeeze the air storage bag 22, the air storage bag 22 recovers its deformation, so that the gas in the air storage column 25 enters the air storage bag 22 through the connecting tube 23, and the detection column 21 and the piston mechanism 211 move and reset successively. Such repeated operations can make the detection column 21 in the air storage column 25 move back and forth, and then facilitate the detection column 21 to reciprocate and knock on the forming component 6, so as to detect whether the forming component 6 is easy to loose. If it is loose, the loose forming component 6 is pushed onto the supporting frame 5 for recycling and reuse.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A forming machine for metal powder processing, comprising a workbench (1), and a lower die mechanism (2) installed inside the workbench (1), an upper die mechanism (4) being arranged directly above the lower die mechanism (2), characterized in that: The upper part of the upper mold mechanism (4) is connected to the output end of the cylinder body (3), and the upper end of the cylinder body (3) is connected to the workbench (1). A push rod assembly (14) is arranged inside the bottom surface of the lower mold mechanism (2), and two discharge ports (141) are symmetrically provided on the upper outer side of the push rod assembly (14). The lower end of the push rod assembly (14) is installed through the support plate (9) in the workbench (1), and a lifting control mechanism is installed below the support plate (9). The lower end of the push rod assembly (14) is connected to a conveying assembly for conveying metal powder, and an automatic rotation control assembly is installed on the outer side of the lower end of the push rod assembly (14). A molding component (6) ejected by the push rod assembly (14) is arranged above the lower mold mechanism (2).

2. A metal powder processing molding machine according to claim 1, characterized in that: A bearing frame (5) is installed in a groove inside the front side of the workbench (1).

3. A metal powder processing molding machine according to claim 1, characterized in that: The lifting control mechanism comprises an electric push rod (12) mounted on the bottom surface of the support plate (9), and the four corners of the support plate (9) are all penetrated by the limiting columns (11) for sliding connection, and the lower end of the electric push rod (12) and the lower end of the limiting column (11) are both connected to the inside of the workbench (1).

4. A metal powder forming machine according to claim 1, characterized in that: The conveying assembly comprises an external feeding pipe (13) connected to a bearing at the lower end of a push rod assembly (14); the external feeding pipe (13) is made of a hose; the interior of the push rod assembly (14) is hollow; the bottom end of the push rod assembly (14) is open; the top of the push rod assembly (14) is solid; and a powder flow meter (15) is installed inside the bottom of the push rod assembly (14).

5. A metal powder forming machine according to claim 1, characterized in that: The automatic rotation control assembly comprises a connecting rope (16) wound around and connected to the outer side of the lower side of the push rod assembly (14); the lower end of the connecting rope (16) passes through the interior of the support plate (9) and is connected to the inner wall of the workbench (1) via a guide wheel; the guide wheel is mounted on the upper surface of the support plate (9); a vortex spring (17) is nested and connected to the outer side of the corresponding push rod assembly (14) above the support plate (9); one end of the vortex spring (17) is connected to the support plate (9).

6. A metal powder processing molding machine according to claim 1, characterized in that: A crossbar (19) is installed in a groove inside the workbench (1) corresponding to the rear side of the lower mold mechanism (2), and a connecting spring (191) is nested and connected to the outer side of one end of the crossbar (19).

7. A metal powder forming machine according to claim 6, characterized in that: An arc-shaped push plate (20) is arranged at the rear side of the molding component (6), a moving frame (18) is installed at the rear side of the push plate (20), and a support frame (8) in a "7"-shaped structure is installed on both left and right sides of the rear of the moving frame (18), and a cross bar (19) is arranged through the lower interior of the support frame (8).

8. A metal powder forming machine according to claim 7, characterized in that: A vertical rod (10) is fixed above the rear side of the support plate (9), and the upper end of the vertical rod (10) passes through the interior of the workbench (1).

9. A metal powder forming machine according to claim 8, characterized in that: The bottom surface of the movable frame (18) is provided with an adjusting groove (181), the front side surface of the adjusting groove (181) is arranged in an inclined shape, the upper end of the vertical rod (10) is arranged below the front side surface of the adjusting groove (181), and the movable frame (18) forms a front-to-back sliding structure through the vertical rod (10).

10. A metal powder processing molding machine according to claim 9, characterized in that: The front side surface of the movable frame (18) is grooved to install an air storage column (25), the interior of the air storage column (25) is fitted and slidably provided with a piston mechanism (211), the front end of the piston mechanism (211) is fixed with a detection column (21), the front end of the detection column (21) passes through the middle of the push plate (20), the upper surface of the movable frame (18) is grooved to embed an air storage bag (22) with a cylindrical structure, the space inside the air storage bag (22) is connected to the space inside the air storage column (25) through a connecting pipe (23) installed inside the movable frame (18), a horizontal plate (7) is arranged above the movable frame (18), the rear side surface of the horizontal plate (7) is connected to the workbench (1), and a row of protrusions (24) are installed on the bottom surface of the horizontal plate (7), the lowest point of the protrusion (24) is lower than the highest point of the air storage bag (22).

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