Water cutting sand feeding device

Abstract

The utility model relates to the technical field of sand feeding, in particular to a water cutting sand feeding device which comprises a shell. The material control structure is used for controlling circulation of grinding materials; the material control structure comprises a containing plate, the edge of the containing plate is fixedly connected with the inner wall of the shell, and the containing plate is used for containing abrasive materials. And the screening structure comprises a screening plate, and the screening plate is connected with the shell in a sliding mode and used for screening the grinding materials. By operating the material control structure, the grinding materials located on the placing plate flow onto the screening plate, and by operating the screening structure, the screening structure can enable the screening plate to shake horizontally, so that the grinding materials smaller than holes in the screening plate leak down, the grinding materials larger than the holes are retained, screening of the grinding materials is achieved, the caking grinding materials are prevented from blocking the discharging port, and use is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to sand technology field, concretely is a water cutting sand feeding device. BACKGROUND

[0002] Water cutting equipment is to use water and sand mixture as cutting target medium, and water flow cutting pump sends the medium to cutting knife in the form of high-speed jet to realize the cutting of the article, and before cutting, water and sand abrasive need to be mixed, which needs to use water cutting sand feeding device to add abrasive to the water tank.

[0003] However, the existing water cutting sand feeding device is mostly used with garnet sand as the abrasive for water cutting. This abrasive has the benefit of high wear resistance, so it needs to be reused. Before this, the used abrasive needs to be dehydrated and dried, which process can cause the abrasive to clump together. The existing water cutting sand feeding device cannot screen the abrasive, so the clumped abrasive can block the discharge port, which is inconvenient to use. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problem of the existing water cutting sand feeding device, which cannot screen the abrasive, so the clumped abrasive can block the discharge port, which is inconvenient to use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A water cutting sand feeding device, comprising:

[0007] A shell;

[0008] A material control structure for controlling the flow of abrasive; the material control structure comprises a placement plate, the edge of which is fixedly connected with the inner wall of the shell, for placing abrasive;

[0009] A screening structure, comprising a screening plate, which is slidingly connected with the shell, for screening the abrasive.

[0010] Preferably, the screening structure further comprises:

[0011] A first ear chamber fixedly connected with one side of the shell;

[0012] A turntable arranged inside the first ear chamber;

[0013] A first motor, the output end of which is fixedly connected with the center of the turntable;

[0014] An outer ring channel arranged on the side of the turntable close to the first motor and fixedly connected with the turntable;

[0015] An inner ring channel is arranged inside the outer ring channel and fixedly connected with the rotating disc; a sliding channel is formed between the inner ring channel and the outer ring channel;

[0016] A sliding member is arranged in the sliding channel and slidably connected with the inner ring channel and the outer ring channel through the sliding channel;

[0017] A connecting plate is sleeved and fixed to the outer side of the sliding member, and the end of the connecting plate away from the first motor is fixedly connected with the screening plate.

[0018] Preferably, a plurality of through holes are arranged on the surface of the placing plate.

[0019] Preferably, the material control structure further comprises:

[0020] Two groups of flow guide plates are arranged on the side edge of the placing plate away from the screening plate and fixedly connected with the placing plate;

[0021] A sealing plate is arranged on the side of the placing plate close to the screening plate and in contact with the placing plate; a plurality of through holes are arranged on the surface of the sealing plate, the size of the plurality of through holes is the same as that of the plurality of through holes, and the positions correspond to each other;

[0022] A sealing cylinder is arranged in the middle of the side of the placing plate away from the screening plate and fixedly connected with the placing plate;

[0023] A second motor is arranged, the output end of the second motor penetrates the sealing cylinder, and the center of the sealing plate is fixedly connected with the sealing plate.

[0024] Preferably, the sand inlet pipe is arranged on the two sides of the shell and in communication with the shell.

[0025] Preferably, the sand collecting structure is arranged inside and below the shell and fixedly connected with the shell, and is used for collecting the screened abrasive materials.

[0026] Preferably, the sand collecting structure comprises:

[0027] A sand collecting hopper is arranged, the edge of the sand collecting hopper is fixedly connected with the shell; the size of the inlet of the sand collecting hopper is larger than that of the outlet;

[0028] A sand outlet pipe is arranged at the position of the outlet and in contact with the sand collecting hopper.

[0029] Preferably, the extrusion structure is arranged on the side of the shell away from the screening structure and is used for extruding the agglomerated abrasive materials.

[0030] Preferably, the extrusion structure comprises:

[0031] The second ear chamber is fixedly connected to the shell.

[0032] Two sets of extrusion plates are disposed on the side of the screening plate near the material control structure and are in contact with the screening plate;

[0033] Two sets of connectors, one end of each set of connectors being fixedly connected to the extrusion plate;

[0034] Two sets of connecting parts are composed of a horizontal plate and a cylindrical pin. One end of the horizontal plate is fixedly connected to the connecting piece, and the other end has a notch. The cylindrical pin is disposed in the notch and is fixedly connected to the horizontal plate.

[0035] Two sets of slotted plates, each set of slotted plates has a sliding groove on its surface, so that the cylindrical pin is placed in the sliding groove, and the slotted plate is slidably connected to the connecting part through the cylindrical pin;

[0036] A driving structure is fixedly connected to the two sets of slot plates.

[0037] Preferably, the driving structure includes:

[0038] A movable component, the two ends of which are fixedly connected to the two sets of groove plates;

[0039] Two sets of limiting plates, one end of the two sets of limiting plates being close to each other is fixedly connected to the moving part, and the other end is slidably connected to the second ear chamber;

[0040] A threaded rod passes through the moving part and is threadedly connected to the moving part;

[0041] A third motor, one end of which is fixedly connected to the end of the threaded rod near the moving part.

[0042] The beneficial effects proposed by this utility model are as follows: by operating the material control structure, the abrasive on the placement plate flows to the screening plate, and the screening structure is operated. The screening structure causes the screening plate to shake horizontally, so that the abrasive smaller than the holes on the screening plate falls down, while the abrasive larger than the holes is retained, thereby realizing the screening of the abrasive, avoiding the blockage of the discharge port by agglomerated abrasive, and facilitating its use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of this utility model;

[0044] Figure 2 for Figure 1 A three-dimensional sectional view of the internal connection structure.

[0045] Figure 3 for Figure 1 Left-view stereoscopic diagram of the central connecting structure;

[0046] Figure 4 for Figure 2 Right-side three-dimensional view of the central connecting structure;

[0047] Figure 5 for Figure 1 A three-dimensional schematic diagram of the internal connection structure;

[0048] Figure 6 for Figure 5 Exploded view of the central connecting structure;

[0049] Figure 7 for Figure 2 Exploded view of the middle section connection structure;

[0050] Figure 8 for Figure 7 A top-down view of the exploded structure connecting the two parts.

[0051] In the diagram: 1. Shell, 2. First ear chamber, 3. Second ear chamber, 4. Sand inlet pipe, 5. Sand collection hopper, 6. Sand outlet pipe, 7. Screening plate, 8. Connecting plate, 9. Sliding part, 10. Inner ring channel, 11. Outer ring channel, 12. Turntable, 13. First motor, 14. Placement plate, 15. Guide plate, 16. Sealing plate, 17. Second motor, 18. Sealing cylinder, 19. Extrusion plate, 20. Connecting part, 21. Connecting part, 22. Groove plate, 23. Moving part, 24. Limiting plate, 25. Threaded rod, 26. Third motor. Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings:

[0053] This embodiment:

[0054] Please see Figures 1-8 In this embodiment: a water jet cutting sand feeding device includes: a shell 1, a material control structure and a screening structure.

[0055] In this embodiment, the material control structure is used to control the flow of abrasive; the material control structure includes: a placement plate 14, the edge of which is fixedly connected to the inner wall of the housing 1, for placing abrasive.

[0056] In this embodiment, the metering of the outflowing abrasive can be controlled by operating the material control structure.

[0057] The screening structure includes a screening plate 7, which is slidably connected to the housing 1 and is used to screen abrasive materials.

[0058] In this embodiment, the mesh size of the sieve on the sieve plate 7 can be 80 mesh or 120 mesh. It is only necessary to select according to actual needs and meet the working conditions.

[0059] By operating the material control structure, the abrasive material located on the placement plate 14 flows onto the screening plate 7. The screening structure is then operated, causing the screening plate 7 to sway horizontally. This causes abrasive material smaller than the holes on the screening plate 7 to fall through, while abrasive material larger than the holes remains, thus achieving the screening of the abrasive material. This prevents abrasive material from clumping and blocking the discharge port, making it easier to use.

[0060] like Figure 2 and Figure 3 As shown, the screening structure also includes: a first ear chamber 2, a turntable 12, a first motor 13, an outer ring channel 11, an inner ring channel 10, a sliding member 9, and a connecting plate 8.

[0061] The first ear chamber 2 is fixedly connected to one side of the housing 1; the turntable 12 is disposed inside the first ear chamber 2; and the output end of the first motor 13 is fixedly connected to the center of the turntable 12.

[0062] In this embodiment, the model of the first motor 13 is selected according to actual needs, as long as it meets the working conditions; when the output end of the first motor 13 rotates, it will drive the turntable 12 to rotate.

[0063] The outer ring track 11 is located on the side of the turntable 12 near the first motor 13 and is fixedly connected to the turntable 12; the inner ring track 10 is located inside the outer ring track 11 and is fixedly connected to the turntable 12; a slide is formed between the inner ring track 10 and the outer ring track 11.

[0064] In this embodiment, the outer ring 11 and the inner ring 10 are based on the shape of a ring. Four planes are evenly recessed on the outer wall of the ring towards the center. The size of the outer ring 11 is larger than that of the inner ring 10. The centers of the outer ring 11 and the inner ring 10 coincide, and a slide is formed between the inner wall of the outer ring 11 and the outer wall of the inner ring 10.

[0065] The sliding member 9 is disposed in the slide rail and is slidably connected to the inner ring rail 10 and the outer ring rail 11 through the slide rail.

[0066] In this embodiment, when the turntable 12 rotates, it will simultaneously drive the inner ring track 10 and the outer ring track 11 to rotate, and use the slide rail to make the slider 9 move horizontally back and forth; that is, when the slider 9 is in the arc position, the slider 9 does not move, and when the slider 9 enters the plane position, the slider 9 will move slightly towards the center of the inner ring track 10.

[0067] The connecting plate 8 is sleeved and fixed on the outside of the sliding member 9, and the end of the connecting plate 8 away from the first motor 13 is fixedly connected to the screening plate 7.

[0068] In this embodiment, the sliding member 9 drives the screening plate 7 to move horizontally back and forth via the connecting plate 8.

[0069] When screening is required, the first motor 13 is started. The output of the first motor 13 drives the turntable 12 to rotate. The turntable 12 simultaneously drives the outer ring track 11 and the inner ring track 10 to rotate, so that the slide rails rotate synchronously. Through the sliding between the slide rails and the sliding member 9, the sliding member 9 moves horizontally back and forth in a small range. The sliding member 9 drives the screening plate 7 to move through the connecting plate 8, so that the abrasive material smaller than the holes on the screening plate 7 can fall down, while the abrasive material larger than the holes can be retained, thereby achieving screening of the abrasive material and preventing the abrasive material from clogging the outlet, making it easy to use.

[0070] Multiple sets of through holes are formed on the surface of the placement plate 14.

[0071] like Figure 5 and Figure 6 As shown, the material control structure also includes: two sets of guide plates 15, a sealing plate 16, a sealing cylinder 18, and a second motor 17.

[0072] Specifically, two sets of guide plates 15 are disposed on the side edge of the placement plate 14 away from the screening plate 7 and are fixedly connected to the placement plate 14.

[0073] In this embodiment, the guide plate 15 can cause the abrasive to flow towards the center of the placement plate 14.

[0074] The sealing plate 16 is disposed on the side of the placement plate 14 near the screening plate 7 and is in contact with the placement plate 14; the surface of the sealing plate 16 has multiple sets of through holes, the size of the multiple sets of through holes is the same as the size of the multiple sets of through holes, and their positions correspond to each other.

[0075] In this embodiment, when the through hole on the sealing plate 16 is vertically aligned with the through hole on the placement plate 14, the abrasive will fall downwards.

[0076] The sealing cylinder 18 is located in the middle of the side of the placement plate 14 away from the screening plate 7, and is fixedly connected to the placement plate 14.

[0077] In this embodiment, the sealing cylinder 18 can prevent the abrasive from contacting the output end of the second motor 17.

[0078] The output end of the second motor 17 passes through the sealing cylinder 18 and is fixedly connected to the center of the sealing plate 16.

[0079] In this embodiment, the model of the second motor 17 is selected according to actual needs, as long as it meets the working conditions; the output end of the second motor 17 can drive the sealing plate 16 to rotate.

[0080] When material needs to be discharged, the second motor 17 is started, and the output end of the second motor 17 drives the sealing plate 16 to rotate. The sealing cylinder 18 can prevent the abrasive from contacting the output shaft of the second motor 17, and the guide plate 15 will cause the abrasive to flow towards the middle position of the placement plate 14. When the through hole on the sealing plate 16 is vertically aligned with the through hole on the placement plate 14, the abrasive will fall downwards to achieve material discharge.

[0081] The water jet cutting sand inlet device also includes: two sets of sand inlet pipes 4; the two sets of sand inlet pipes 4 are symmetrically arranged on both sides of the housing 1 and connected to the housing 1.

[0082] The waterjet cutting abrasive feed device also includes: a sand collecting structure; the sand collecting structure is located inside the lower part of the housing 1 and is fixedly connected to the housing 1, and is used to collect the screened abrasive.

[0083] like Figure 7 and Figure 8 As shown, the sand collection structure includes: sand collection hopper 5 and sand discharge pipe 6.

[0084] The edge of the sand collecting hopper 5 is fixedly connected to the shell 1; the inlet size of the sand collecting hopper 5 is larger than the outlet size.

[0085] In this embodiment, the inlet and outlet of the sand collecting hopper 5 are rectangular in shape; the abrasive material that has been screened will enter the sand collecting hopper 5 and be discharged from the outlet of the sand collecting hopper 5.

[0086] The sand discharge pipe 6 is located at the discharge port and is in close contact with the sand collection hopper 5.

[0087] In this embodiment, the inlet and outlet ends of the sand discharge pipe 6 are circular, and the size of the inlet end is larger than the size of the outlet end.

[0088] After the abrasive is screened, some abrasive particles will remain on the screen plate 7, so it is necessary to remove the abrasive particles and grind them.

[0089] To address the aforementioned issues, this embodiment proposes an implementation method in which the waterjet cutting abrasive feed device further includes an extrusion structure. The extrusion structure is located on the side of the housing 1 away from the screening structure and is used to extrude agglomerated abrasive.

[0090] like Figure 4 As shown, the extrusion structure includes: a second ear chamber 3, two sets of extrusion plates 19, two sets of connectors 20, two sets of connecting parts 21, two sets of groove plates 22, and a drive structure.

[0091] Specifically, the second ear chamber 3 is fixedly connected to the shell 1; two sets of extrusion plates 19 are disposed on the side of the screening plate 7 near the material control structure and are in contact with the screening plate 7.

[0092] In this embodiment, the agglomerated abrasive is squeezed by moving the two sets of extrusion plates 19 toward the middle, thereby making the agglomerated abrasive loose. Since the agglomerated abrasive is not sticky, it will not stick to the extrusion plates 19.

[0093] One end of each set of connectors 20 is fixedly connected to the extrusion plate 19; the two sets of connecting parts 21 are composed of a horizontal plate and a cylindrical pin. One end of the horizontal plate is fixedly connected to the connector 20, and the other end has a notch; the cylindrical pin is set in the notch and is fixedly connected to the horizontal plate.

[0094] In this embodiment, the connecting part 21 drives the extrusion plate 19 to move towards the middle or outward simultaneously through the connecting member 20.

[0095] Each set of slot plates 22 has a sliding groove on its surface, so that the cylindrical pin is placed in the sliding groove, and the slot plate 22 is slidably connected to the connecting part 21 through the cylindrical pin; the driving structure is fixedly connected to the two sets of slot plates 22.

[0096] In this embodiment, the driving structure can make the two sets of slot plates 22 move horizontally at the same time, and the slot plates 22 can move the two sets of cylindrical pins to the middle or the outside at the same time by sliding with the cylindrical pins.

[0097] When it is necessary to compress the abrasive agglomerates, the drive structure can be operated to move the two sets of grooved plates 22 horizontally towards the extrusion plate 19 simultaneously. The two sets of grooved plates 22 move the two sets of cylindrical pins towards the center simultaneously through the sliding groove. The cylindrical pins drive the connecting part 21 to move, and the connecting part 21 drives the extrusion plate 19 to move through the connecting piece 20. The two sets of extrusion plates 19 work together to compress the abrasive agglomerates, thereby loosening the abrasive agglomerates and eliminating the need for manual operation.

[0098] like Figure 4 As shown, the drive structure includes: a moving part 23, two sets of limiting plates 24, a threaded rod 25, and a third motor 26.

[0099] The two ends of the movable part 23 are fixedly connected to the two sets of groove plates 22; one end of the two sets of limiting plates 24 that are close to each other is fixedly connected to the movable part 23, and the other end is slidably connected to the second ear chamber 3.

[0100] In this embodiment, the moving member 23 will drive the two sets of slot plates 22 to move simultaneously, while the limiting plate 24 restricts the moving direction of the moving member 23 by sliding between it and the second ear chamber 3.

[0101] The threaded rod 25 passes through the movable part 23 and is threadedly connected to the movable part 23; one end of the third motor 26 is fixedly connected to the end of the threaded rod 25 near the movable part 23.

[0102] In this embodiment, the model of the third motor 26 is selected according to actual needs, as long as it meets the working conditions; the output end of the third motor 26 will drive the threaded rod 25 to rotate, and the threaded rod 25 will cause the moving part 23 to move horizontally.

[0103] When the drive structure is in operation, the third motor 26 is started. The output end of the third motor 26 drives the threaded rod 25 to rotate. The threaded rod 25 causes the moving part 23 to move horizontally. The moving part 23 moves under the restriction of the limiting plate 24 and drives the two sets of slot plates 22 to move.

[0104] Working principle:

[0105] When in use, the abrasive feed device for water cutting adds abrasive to the housing 1 through the abrasive feed pipe 4.

[0106] When material needs to be discharged, the second motor 17 is started, and the output end of the second motor 17 drives the sealing plate 16 to rotate. The sealing cylinder 18 can prevent the abrasive from contacting the output shaft of the second motor 17, and the guide plate 15 will cause the abrasive to flow towards the middle position of the placement plate 14. When the through hole on the sealing plate 16 is vertically aligned with the through hole on the placement plate 14, the abrasive will fall downwards to achieve material discharge.

[0107] After the abrasive falls onto the screening plate 7, the first motor 13 is started. The output end of the first motor 13 drives the turntable 12 to rotate. The turntable 12 simultaneously drives the outer ring track 11 and the inner ring track 10 to rotate, so that the slide rails rotate synchronously. Through the sliding between the slide rails and the sliding member 9, the sliding member 9 moves horizontally back and forth in a small range. The sliding member 9 drives the screening plate 7 to move through the connecting plate 8, so that the abrasive smaller than the holes on the screening plate 7 falls down, while the abrasive larger than the holes is retained, thus realizing the screening of the abrasive and preventing the abrasive from clumping and blocking the discharge port, making it easy to use.

[0108] When it is necessary to compress the abrasive agglomerates, the third motor 26 is started. The output end of the third motor 26 drives the threaded rod 25 to rotate. The threaded rod 25 causes the moving part 23 to move horizontally. The moving part 23 moves under the restriction of the limiting plate 24 and drives the two sets of grooved plates 22 to move horizontally towards the extrusion plate 19. The two sets of grooved plates 22 cause the two sets of cylindrical pins to move towards the middle at the same time through the sliding groove. The cylindrical pins drive the connecting part 21 to move. The connecting part 21 drives the extrusion plate 19 to move through the connecting part 20. The two sets of extrusion plates 19 work together to compress the abrasive agglomerates, thereby loosening the abrasive agglomerates. Manual operation is no longer required, thus completing the use of this device.

[0109] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A waterjet cutting sand feeding device, characterized in that: include: Shell (1); The material control structure is used to control the flow of abrasive. The material control structure includes: a placement plate (14), the edge of which is fixedly connected to the inner wall of the housing (1) for placing abrasive; The screening structure includes a screening plate (7), which is slidably connected to the housing (1) for screening abrasive materials.

2. The waterjet cutting sand feeding device according to claim 1, characterized in that: The screening structure further includes: The first ear chamber (2) is fixedly connected to one side of the housing (1); A turntable (12) is disposed inside the first ear chamber (2); The first motor (13) is fixedly connected to the center of the turntable (12) at its output end. The outer ring (11) is located on the side of the turntable (12) near the first motor (13) and is fixedly connected to the turntable (12); An inner ring track (10) is disposed inside the outer ring track (11) and is fixedly connected to the turntable (12); a slide is formed between the inner ring track (10) and the outer ring track (11); A sliding member (9) is disposed in the slide rail and is slidably connected to the inner ring rail (10) and the outer ring rail (11) through the slide rail; A connecting plate (8) is sleeved and fixed on the outside of the sliding member (9), and the end of the connecting plate (8) away from the first motor (13) is fixedly connected to the screening plate (7).

3. The waterjet cutting sand feeding device according to claim 1, characterized in that: The surface of the placement plate (14) has multiple sets of through holes.

4. The waterjet cutting sand feeding device according to claim 3, characterized in that: The material control structure also includes: Two sets of guide plates (15) are disposed on the side edge of the placement plate (14) away from the screening plate (7) and are fixedly connected to the placement plate (14); A sealing plate (16) is disposed on the side of the placement plate (14) close to the screening plate (7) and is in contact with the placement plate (14); the surface of the sealing plate (16) has multiple sets of through holes, the size of the multiple sets of through holes is the same as the size of the multiple sets of through holes, and their positions correspond to each other; A sealing cylinder (18) is disposed in the middle of the side of the placement plate (14) away from the screening plate (7) and is fixedly connected to the placement plate (14); The output end of the second motor (17) passes through the sealing cylinder (18) and is fixedly connected to the center of the sealing plate (16).

5. The waterjet cutting sand feed device according to claim 1, characterized in that: Also includes: Two sets of sand inlet pipes (4); the two sets of sand inlet pipes (4) are symmetrically arranged on both sides of the shell (1) and connected to the shell (1).

6. The waterjet cutting sand feed device according to claim 1, characterized in that: Also includes: A sand collection structure is located inside the lower part of the shell (1) and is fixedly connected to the shell (1) for collecting the screened abrasive.

7. The waterjet cutting sand feed device according to claim 6, characterized in that: The sand collection structure includes: A sand collecting hopper (5) is fixedly connected to the shell (1) at its edge; the inlet size of the sand collecting hopper (5) is larger than the outlet size. The sand discharge pipe (6) is located at the discharge port and is in close contact with the sand collection hopper (5).

8. The waterjet cutting sand feed device according to claim 1, characterized in that: Also includes: An extrusion structure is provided on the side of the housing (1) away from the screening structure, and is used to extrude agglomerated abrasive.

9. The waterjet cutting sand feed device according to claim 8, characterized in that: The extrusion structure includes: The second ear chamber (3) is fixedly connected to the housing (1); Two sets of extrusion plates (19) are disposed on the side of the screening plate (7) near the material control structure and are in contact with the screening plate (7); Two sets of connectors (20), one end of each set of connectors (20) is fixedly connected to the extrusion plate (19); Two sets of connecting parts (21) are composed of a horizontal plate and a cylindrical pin. One end of the horizontal plate is fixedly connected to the connecting piece (20), and the other end has a notch. The cylindrical pin is set in the notch and is fixedly connected to the horizontal plate. Two sets of slotted plates (22), each set of slotted plates (22) has a sliding groove on its surface, so that the cylindrical pin is placed in the sliding groove, and the slotted plate (22) is slidably connected to the connecting part (21) through the cylindrical pin; The driving structure is fixedly connected to the two sets of slot plates (22).

10. The waterjet cutting sand feed device according to claim 9, characterized in that: The driving structure includes: The movable component (23) has its two ends fixedly connected to the two sets of the slot plates (22); Two sets of limiting plates (24), one end of the two sets of limiting plates (24) is fixedly connected to the moving part (23) and the other end is slidably connected to the second ear chamber (3); A threaded rod (25) passes through the movable part (23) and is threadedly connected to the movable part (23); A third motor (26) is fixedly connected at one end to the end of the threaded rod (25) near the moving part (23).

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