Laser cladding device capable of preheating workpieces

Abstract

The invention relates to the technical field of cladding devices, and provides a laser cladding device capable of preheating a workpiece, which comprises a worktable and a shell mounted at the top end of the worktable, a rotating disc is movably installed in the middle of the workbench, an adjusting mechanism is arranged in the rotating disc, a support is fixedly installed on one side of the rotating disc, a preheating plate is fixedly installed on the other side of the rotating disc, and a cladding head is installed at one end of the shell. According to the invention, through the arrangement of the turntable, when a workpiece is subjected to cladding processing, preheating and heat dissipation work can be simultaneously carried out on other workpieces, so that the working efficiency of the equipment is improved, the situation that the equipment is in an idle state due to replacement after the workpiece is cooled is avoided, and the utilization rate of the equipment is improved; the workpieces at the preheating and heat dissipation positions can rotate simultaneously, preheating is uniform, the uniformity of a cladding layer is improved, heat dissipation is uniform, the heat dissipation area of the surfaces of the workpieces is increased, and heat dissipation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cladding devices, and in particular to a laser cladding device capable of preheating a workpiece. Background Art

[0002] Laser cladding device is the core equipment for laser cladding technology. It uses a high-energy-density laser beam to quickly melt metal alloy powder or wire and fuse it with the surface of the substrate to form a metallurgical cladding layer. With the continuous maturity of laser cladding technology and equipment, its application field will also expand to other industrial fields such as petroleum, chemical industry, electric power, rail transportation, etc. In the future, laser cladding devices will pay more attention to the development of high efficiency, intelligence and multi-function to meet the needs of different fields for high-performance materials and components;

[0003] To this end, the patent with publication number CN115852364A discloses a laser cladding device, including a workbench and a substrate rod, electric push rods are installed on the left and right ends of the workbench, and a mounting plate is fixed on the top of the electric push rod, and a starting rod is connected to the outside of the mounting plate, an adjusting screw is arranged below the starting rod, and an adjusting block is connected to the outside of the adjusting screw, and a cladding head is installed on the outside of the adjusting block, a fixed plate is installed on the top of the workbench, and a rotating disk is connected to the middle of the fixed plate, and an arc clamp is connected to the outside of the rotating disk, a limiting rod is arranged on the outside of the arc clamp, and the substrate rod is arranged on the right side of the rotating disk, a heat sink is arranged at the bottom of the workbench, and a rotating rod is arranged on the outside of the cross bar. When the cladding device of the present invention is used, it is convenient to automatically change the processing position of the cladding head, convenient to fix substrates of different sizes, and convenient to quickly cool the substrate processed by laser high temperature;

[0004] The laser cladding device mentioned above is convenient for automatically changing the processing position of the cladding head when in use, convenient for fixing workpieces of different sizes, and convenient for quickly cooling workpieces processed by laser at high temperature. However, the workpiece needs to be cooled after processing before it can be replaced. While waiting for the workpiece to cool, the laser cladding device may be idle and unable to continue other processing tasks, thereby reducing the utilization rate of the equipment; and it is not convenient to preheat the workpiece before processing. If the workpiece is not preheated, the temperature difference between the cladding layer and the substrate will be greater, resulting in a significant increase in residual stress. The residual stress may cause cracks in the cladding layer, reduce its mechanical properties and service life, and at the same time cause the heat conduction conditions in the laser cladding process to deteriorate, affecting the uniformity and quality stability of the cladding layer. Summary of the invention

[0005] The purpose of the present invention is to provide a laser cladding device capable of preheating a workpiece, so as to solve the defects of the existing laser cladding device that the efficiency is low and it is inconvenient to preheat the workpiece.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a laser cladding device capable of preheating a workpiece, comprising a workbench and a shell installed on the top thereof; a turntable is movably installed at the middle position of the workbench, and an adjustment mechanism is arranged inside the turntable, a bracket is fixedly installed on one side of the turntable, a preheating plate is fixedly installed on the other side of the turntable, a cladding head is installed at one end of the shell, and feeding pipes are connected to both sides of the cladding head; the adjustment mechanism comprises a sleeve, a support plate, a turbine, a worm, a third gear, a gear ring and a third servo motor; the gear ring is movably installed inside the turntable, a third gear is rotatably installed inside the turntable inside the gear ring, and a third servo motor is installed at the bottom end of the third gear, a worm is fixed at the top of the third gear, and a support plate is fixed at the top of the turntable on one side of the worm, a sleeve is arranged on one side of the support plate, and a turbine is fixedly installed on one side of the sleeve.

[0007] Preferably, a large gear is provided on the outer wall of the turntable, and a first gear is rotatably installed inside the workbench on one side of the large gear, a first servo motor is installed at the bottom end of the first gear, and the first gear is meshingly connected with the large gear.

[0008] Preferably, a fan blade is installed at the bottom end of the bracket, a connecting column is rotatably installed at the top end of the turntable on one side of the bracket, and a pulley mechanism is connected to the top end of the connecting column.

[0009] Preferably, one end of the pulley mechanism away from the connecting column is connected to the top of the fan blade, and a second gear is fixedly mounted on the bottom end of the connecting column, and the second gear is meshingly connected to the gear ring.

[0010] Preferably, a screw rod is transversely installed inside the housing, and a slide is movably installed outside the screw rod, and both ends of the bottom of the slide pass through a limit axis.

[0011] Preferably, a second servo motor is installed on one side of the screw rod, the slide table and the screw rod are threadedly connected, and a sliding structure is formed between the slide table and the limiting shaft.

[0012] Preferably, a connecting block is fixedly installed on one side of the support plate, and the connecting block and the sleeve are threadedly connected, both ends of the connecting block and the support plate are threadedly connected with fixed shafts, a pushing block is provided inside the connecting block, and a clamping block is movably installed inside the pushing block, one side of the clamping block is open, and one side of the clamping block is trapezoidal, and one side of the pushing block is consistent with the shape of the clamping block.

[0013] Preferably, an extrusion groove is movably installed on one side of the pushing block, and a protrusion is provided on one side of the extrusion groove, the minimum inner diameter of one side of the extrusion groove is smaller than the maximum outer diameter of one side of the clamping block, a convex strip is provided inside the sleeve, and the inner diameter of the convex strip is smaller than the outer diameter of the protrusion, and a movable shaft is threadedly installed on the top end of the sleeve.

[0014] Preferably, the turbine and the worm are meshingly connected, a sliding structure is formed between the gear ring and the turntable, the inner wall and the outer wall of the gear ring are both provided with teeth, and the gear ring and the third gear are meshingly connected.

[0015] Preferably, a heating tube is installed inside the preheating plate, a connecting tube is connected to the top of the preheating plate, and the outer wall of the shell at one end of the connecting tube is fixed, a fan is installed in the fan at the bottom, a hose is connected to one end, and a copper tube is wrapped around the outside of the feeding pipe at one end of the hose.

[0016] Compared with the prior art, the invention has the following beneficial effects: the laser cladding device can preheat and dissipate heat for other workpieces at the same time when cladding the workpiece, thereby improving the working efficiency of the equipment, avoiding the equipment being idle due to waiting for the workpiece to cool and then be replaced, and improving the utilization rate of the equipment; and when the workpiece being clad is rotated, the workpieces at the preheating and heat dissipation locations can be rotated at the same time, preheating is uniform, the uniformity of the cladding layer is improved, the heat dissipation is uniform, the heat dissipation area on the workpiece surface is increased, and the heat dissipation efficiency is improved;

[0017] 1. A turntable is provided, and three sets of sleeves are provided on the top of the turntable. After the workpiece is fixed with the sleeve, a preheating treatment is performed inside the preheating plate. When the preheating is completed, the first servo motor is started to drive the first gear to rotate, so that the large gear and the turntable meshing therewith rotate, and rotate 120° to the bottom of the cladding head for cladding work. When the cladding work is completed, the turntable is rotated 120° to the bottom of the fan blade again to dissipate heat for the workpiece. During the preheating, the workpiece is rotated to the bottom of the cladding head for cladding work. When the cladding work is completed again, the workpiece after heat dissipation is removed and replaced with a new workpiece. Then the turntable is rotated to preheat the new workpiece at the preheating plate, and the preheated workpiece is processed at the cladding head. The processed workpiece is dissipated at the fan blade, and a reciprocating cycle is performed, so that the laser cladding device is always in a working state, the utilization rate of the equipment is improved, and the equipment can be preheated and dissipated at the same time, thereby improving work efficiency.

[0018] Furthermore, a fan is installed at one end of the connecting pipe, which can transfer the heat generated during preheating in the preheating plate to the copper tube through the hose. The copper tube is wrapped around the outside of the feeding tube, and gold powder is transported inside the feeding tube. The heat is discharged from the bottom of the copper tube around the outside of the feeding tube and from the top. The material of the copper tube can conduct heat to the surface of the feeding tube to preheat the gold powder inside, thereby reducing the temperature gradient between the gold powder and the substrate, making the cladding process more stable, improving the melting speed and melting quality of the gold powder, and making the cladding layer more uniform and dense.

[0019] 2. By providing an adjustment mechanism, while processing the workpiece, the third servo motor is started to drive the third gear to rotate, and all the third gears are driven to rotate at the same time under the action of the gear ring, and the worm on the top is meshed with the turbine, so that the turbine drives the workpiece inside the sleeve to rotate, thereby realizing the cladding work on the surface of the workpiece. At the same time, the workpieces at the preheating and heat dissipation positions rotate synchronously, which can improve the uniformity of preheating and heat dissipation, thereby realizing uniform preheating of the laser cladding device, reducing the temperature gradient on the surface of the workpiece, and improving the uniformity of the cladding layer. When dissipating heat, the workpiece rotates to increase the heat dissipation area on the surface of the workpiece, improve the heat dissipation efficiency, and help to dissipate heat faster and reduce the temperature of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a left-view three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a right-side three-dimensional structural schematic diagram of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the workbench of the present invention when it is cut open and viewed from above;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the workbench of the present invention when it is cut open and viewed from above;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the turntable of the present invention when it is cut away and viewed from above;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the turntable of the present invention when it is cut away and viewed from above;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the housing of the present invention when it is cut away;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the housing of the present invention when it is cut open and viewed from above;

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the sleeve of the present invention;

[0029] Fig.10It is a schematic diagram of the three-dimensional structure of the sleeve of the present invention in a disassembled state.

[0030] Explanation of the reference numerals in the figure: 1. workbench; 2. turntable; 21. first servo motor; 22. first gear; 23. large gear; 3. bracket; 31. second gear; 32. connecting column; 33. pulley mechanism; 34. fan blade; 4. cladding head; 5. housing; 51. slide; 52. screw rod; 53. second servo motor; 54. limit shaft; 6. adjustment mechanism; 61. sleeve; 611. connecting block; 612. clamping block; 613. extrusion groove; 614. pushing block; 615. movable shaft; 616. fixed shaft; 617. convex strip; 618. convex block; 62. support plate; 63. turbine; 64. worm; 65. third gear; 66. gear ring; 67. third servo motor; 7. preheating plate; 71. connecting pipe; 72. fan; 73. hose; 74. copper pipe; 8. feeding pipe. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figure 1-Figure 10The present invention provides a laser cladding device for preheating a workpiece, comprising a workbench 1 and a housing 5 mounted on the top thereof; a turntable 2 is movably mounted at the middle position of the workbench 1, and an adjustment mechanism 6 is arranged inside the turntable 2, a bracket 3 is fixedly mounted on one side of the turntable 2, and a preheating plate 7 is fixedly mounted on the other side of the turntable 2, a cladding head 4 is mounted on one end of the housing 5, and both sides of the cladding head 4 are connected to a feeding pipe 8; the adjustment mechanism 6 comprises a sleeve 61, a support plate 62, a turbine 63, a worm 64, and a third gear 65 , a gear ring 66 and a third servo motor 67; the gear ring 66 is movably installed inside the turntable 2, a large gear 23 is provided on the outer wall of the turntable 2, and a first gear 22 is rotatably installed inside the workbench 1 on one side of the large gear 23, a first servo motor 21 is installed at the bottom end of the first gear 22, the first gear 22 and the large gear 23 are meshed and connected, a third gear 65 is rotatably installed inside the turntable 2 inside the gear ring 66, a third servo motor 67 is installed at the bottom end of the third gear 65, and a worm is fixed at the top of the third gear 65 64, and a support plate 62 is fixed to the top of the turntable 2 on one side of the worm 64, a sleeve 61 is provided on one side of the support plate 62, and a turbine 63 is fixedly installed on one side of the sleeve 61, a connecting block 611 is fixedly installed on one side of the support plate 62, and the connecting block 611 and the sleeve 61 are threadedly connected, and both ends of the connecting block 611 and the support plate 62 are threadedly connected with a fixed shaft 616, a pushing block 614 is provided inside the connecting block 611, and a clamping block 612 is movably installed inside the pushing block 614, and the clamping block One side of the sleeve 612 is open, and one side of the clamping block 612 is trapezoidal, one side of the pushing block 614 matches the shape of the clamping block 612, one side of the pushing block 614 is movably mounted with an extrusion groove 613, and one side of the extrusion groove 613 is provided with a protrusion 618, the minimum inner diameter of one side of the extrusion groove 613 is smaller than the maximum outer diameter of one side of the clamping block 612, a convex strip 617 is provided inside the sleeve 61, and the inner diameter of the convex strip 617 is smaller than the outer diameter of the protrusion 618, and a movable shaft 615 is threadedly mounted on the top of the sleeve 61;

[0033] Reference Figure 2 , Figure 3 , Fig. 9 and Fig.10As shown, when the device is in use, three sets of sleeves 61 are arranged on the top of the turntable 2. First, insert the workpiece into the clamping block 612 at the heating position, and then pull the movable shaft 615 to drive the sleeve 61 to rotate outside the connecting block 611. Since the connecting block 611 and the sleeve 61 are threadedly connected, the sleeve 61 rotates to continuously squeeze the connecting block 611, driving the convex strip 617 inside it to engage the convex block 618, driving the extrusion groove 613 to squeeze inward, so that one side of the extrusion groove 613 presses the clamping block 612, pushing the clamping block 612 to move toward the inside of the pushing block 614. One side of the pushing block 614 matches the shape of the clamping block 612, both of which are trapezoidal. The clamping block 612 moves backward continuously, and the pushing block 614 squeezes it, so that The opening on one side of the clamping block 612 is continuously closed to achieve the limit fixation of the workpiece. After the workpiece is fixed, the heating tube inside the preheating plate 7 is started to preheat it, and at the same time, the third servo motor 67 is started to drive the third gear 65 to rotate, and the gear ring 66 is meshed with the third gear 65. The rotation of the gear ring 66 drives all the third gears 65 to rotate at the same time, and the worm 64 at the top is meshed with the turbine 63, so that the turbine 63 rotates, driving the workpiece inside the pushing block 614 fixed thereto to rotate, so that the preheating of the workpiece is more uniform. When the preheating is completed, the first servo motor 21 is started to drive the first gear 22 to rotate, so that the large gear 23 and the turntable 2 meshed therewith rotate, and the workpiece is rotated 120° to the bottom of the cladding head 4 to prepare for cladding work;

[0034] The fan blade 34 is installed at the bottom end of the bracket 3, and a connecting column 32 is rotatably installed at the top of the turntable 2 on one side of the bracket 3, and a pulley mechanism 33 is connected to the top of the connecting column 32. The end of the pulley mechanism 33 away from the connecting column 32 is connected to the top of the fan blade 34. The bottom end of the connecting column 32 is fixedly installed with a second gear 31, and the second gear 31 and the gear ring 66 are meshed and connected. A screw rod 52 is horizontally installed inside the housing 5, and a slide 51 is movably installed outside the screw rod 52. The two ends of the bottom of the slide 51 pass through the limit shaft 54. A second servo motor 53 is installed on one side of the screw rod 52. The slide 51 and the screw rod 52 The gears 66 and the third gear 65 are meshed and connected. A heating pipe is installed inside the preheating plate 7. A connecting pipe 71 is connected to the top of the preheating plate 7. The outer wall of the shell 5 at one end of the connecting pipe 71 is fixed with a 75. A fan 72 is installed in the fan 72 at the bottom of the 75. A hose 73 is connected to one end of the 75. A copper pipe 74 is wound around the outside of the feeding pipe 8 at one end of the hose 73.

[0035] Reference Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, when the device is used, the laser of the cladding head 4 is started to melt the gold powder instantly and spray it onto the surface of the workpiece for fusion. At the same time, a connecting pipe 71 is connected to the top of the preheating plate 7. A fan 72 is installed at one end of the connecting pipe 71. The heat generated during preheating in the preheating plate 7 can be transferred to the copper tube 74 through a hose 73. The copper tube 74 is wound around the outside of the feeding tube 8. The inside of the feeding tube 8 is transported with gold powder. The heat is discharged from the bottom of the copper tube 74 around the outside of the feeding tube 8 and from the top. The material of the copper tube 74 can conduct the heat to the surface of the feeding tube 8 to The gold powder in the workpiece is preheated to improve the melting speed and melting quality of the gold powder. The second servo motor 53 is started to drive the screw rod 52 to rotate, and the slide 51 threadedly connected thereto is driven to move to one side. The limit shaft 54 ​​prevents the slide 51 from rotating when the screw rod 52 rotates, thereby realizing the displacement of the slide 51. The movement of the slide 51 drives the cladding head 4 fixed thereto to move. The three sets of push blocks 614 drive the workpiece to rotate at the same time, thereby completing the cladding work on the workpiece surface. When the cladding work is completed, the turntable is rotated 2120° again so that the workpiece is close to the fan blade 34. At the bottom, when the gear ring 66 rotates clockwise, the gear ring 66 meshes with the second gear 31, so that the second gear 31 and the connecting column 32 rotate, and the connecting column 32 and the fan blade 34 are connected by the pulley mechanism 33. When the connecting column 32 rotates, the fan blade 34 rotates, and the fan blade 34 rotates to generate wind to dissipate heat for the workpiece. During the preheating, the workpiece rotates to the bottom of the cladding head 4 for cladding. When the cladding work is completed again, the third servo motor 67 is stopped from rotating, and the movable shaft 615 is pulled to drive the sleeve 61 moves outward, the clamping block 612 loses its extrusion, and the opening expands outward, so that the workpiece loses its limit, the workpiece after heat dissipation is removed, and a new workpiece is replaced and fixed again, and then the turntable 2 is rotated to preheat the new workpiece to the preheating plate 7, and the preheated workpiece is processed at the cladding head 4, and the processed workpiece is cooled to the fan blade 34, and at the same time, the third servo motor 67 is started to drive the three groups of workpieces to rotate, so as to perform reciprocating cycle work, avoid the equipment being idle due to waiting for the workpiece to be preheated or cooled for reprocessing or replacement, and improve the utilization rate of the equipment.

[0036] 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 laser cladding device capable of preheating a workpiece, comprising a workbench (1) and a housing (5) mounted on the top thereof; Features: A turntable (2) is movably mounted at the middle of the workbench (1), and an adjustment mechanism (6) is arranged inside the turntable (2); a bracket (3) is fixedly mounted on one side of the turntable (2), and a preheating plate (7) is fixedly mounted on the other side of the turntable (2); a cladding head (4) is mounted on one end of the housing (5), and both sides of the cladding head (4) are connected to feeding pipes (8); The adjustment mechanism (6) comprises a sleeve (61), a support plate (62), a turbine (63), a worm (64), a third gear (65), a gear ring (66) and a third servo motor (67); The gear ring (66) is movably mounted inside the turntable (2); a third gear (65) is rotatably mounted inside the turntable (2) inside the gear ring (66); a third servo motor (67) is mounted at the bottom end of the third gear (65); a worm (64) is fixed to the top end of the third gear (65); a support plate (62) is fixed to the top end of the turntable (2) on one side of the worm (64); a sleeve (61) is provided on one side of the support plate (62); and a turbine (63) is fixedly mounted on one side of the sleeve (61).

2. A laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: A large gear (23) is provided on the outer wall of the turntable (2), and a first gear (22) is rotatably installed inside the workbench (1) on one side of the large gear (23), a first servo motor (21) is installed at the bottom end of the first gear (22), and the first gear (22) and the large gear (23) are meshingly connected.

3. The laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: A fan blade (34) is installed at the bottom end of the bracket (3), a connecting column (32) is rotatably installed at the top end of the turntable (2) on one side of the bracket (3), and a pulley mechanism (33) is connected to the top end of the connecting column (32).

4. The laser cladding device capable of preheating a workpiece according to claim 3, characterized in that: One end of the pulley mechanism (33) away from the connecting column (32) is connected to the top of the fan blade (34); a second gear (31) is fixedly mounted on the bottom end of the connecting column (32), and the second gear (31) is meshingly connected to the gear ring (66).

5. The laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: A screw rod (52) is transversely mounted inside the housing (5), and a slide table (51) is movably mounted outside the screw rod (52), with limit shafts (54) passing through both ends of the bottom of the slide table (51).

6. The laser cladding device capable of preheating a workpiece according to claim 5, characterized in that: A second servo motor (53) is installed on one side of the screw rod (52); the slide table (51) and the screw rod (52) are threadedly connected, and a sliding structure is formed between the slide table (51) and the limiting shaft (54).

7. The laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: A connecting block (611) is fixedly installed on one side of the support plate (62), and the connecting block (611) and the sleeve (61) are threadedly connected. Both ends of the connecting block (611) and the support plate (62) are threadedly connected with fixed shafts (616). A pushing block (614) is arranged inside the connecting block (611), and a clamping block (612) is movably installed inside the pushing block (614). One side of the clamping block (612) is in an open shape, and one side of the clamping block (612) is in a trapezoidal shape. One side of the pushing block (614) matches the shape of the clamping block (612).

8. The laser cladding device capable of preheating a workpiece according to claim 7, characterized in that: An extrusion groove (613) is movably mounted on one side of the pushing block (614), and a protrusion (618) is arranged on one side of the extrusion groove (613); the minimum inner diameter of one side of the extrusion groove (613) is smaller than the maximum outer diameter of one side of the clamping block (612); a convex strip (617) is arranged inside the sleeve (61), and the inner diameter of the convex strip (617) is smaller than the outer diameter of the protrusion (618); a movable shaft (615) is threadedly mounted on the top end of the sleeve (61).

9. The laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: The turbine (63) and the worm (64) are meshingly connected, a sliding structure is formed between the gear ring (66) and the rotating disk (2), the inner wall and the outer wall of the gear ring (66) are both provided with teeth, and the gear ring (66) and the third gear (65) are meshingly connected.

10. The laser cladding device capable of preheating a workpiece according to claim 1, characterized in that: A heating tube is installed inside the preheating plate (7), a connecting tube (71) is connected to the top of the preheating plate (7), and a (75) is fixed to the outer wall of the shell (5) at one end of the connecting tube (71), a fan (72) is installed inside the fan (72) at the bottom of the (75), a hose (73) is connected to one end of the (75), and a copper tube (74) is wound around the outside of the feeding tube (8) at one end of the hose (73).

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