Framework layer wrapping machine of rubber pipe

Abstract

The invention belongs to the technical field of rubber tube manufacturing, and discloses a rubber tube framework layer wrapping machine which comprises a wrapping wheel installed in the wrapping machine through a hanging bracket and a driving module installed on the wrapping machine and in driving connection with the wrapping wheel. The conveying belt is arranged in the wrapping machine and is used for conveying the rubber pipe at a differential speed; wherein the winding wheel comprises main body units formed by splicing, a gear ring I which is fixedly arranged between the two main body units and is coaxial with the main body units, and a wire wheel module I and a wire wheel module II which are respectively arranged on the two main body units. The wire winding device is compact in structural design, and the first wire wheel module and the second wire wheel module are arranged on the two sides of the wire winding wheel correspondingly and can be driven synchronously. And moreover, the winding connection of framework layers with different complexities can be carried out by arranging a multi-station winding connection wheel, so that a more complicated framework layer is constructed under the precondition of using the same amount of fiber wires.

Description

Technical Field

[0001] The invention belongs to the technical field of hose manufacturing, in particular to a hose skeleton layer winding machine. Background Art

[0002] In order to improve its own strength, cable hoses are usually designed as inner and outer sandwich structures, in which a skeleton layer is provided. The skeleton layer is made of fiber wire or steel wire and is a very important part of the hose design. It largely determines the physical properties of the hose, such as pressure bearing capacity, flexibility and wear resistance.

[0003] Usually, for the design of the skeleton layer, a winding machine is used to wind an interlaced uniform spiral on the inner layer of the hose, and then the outer layer of the hose is formed thereon to complete the process. Since the winding work is carried out immediately after the inner layer is formed and cooled, it will drag the long hose line into the winding machine. It is easy for the fiber lines wound on it to be unevenly arranged, sometimes dense and sometimes sparse, due to the poor straightness of the hose during winding. This has a negative impact on the construction of the skeleton layer and may cause uneven local strength of the hose after molding. In addition, existing winding machines usually use multi-station winding to achieve the staggered arrangement of fiber lines to increase the complexity of the skeleton layer configuration, thereby increasing the strength. This type of winding machine has many stations, but the actual finished product has the defect of low complexity of the skeleton layer configuration.

[0004] The present application proposes a hose skeleton layer winding machine to overcome the above-mentioned defects. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a hose skeleton layer winding machine.

[0006] To achieve the above object, the present invention provides the following technical solution: a hose skeleton layer winding machine, comprising a winding wheel, which is installed inside the winding machine through a hanger, A driving module, which is installed on the winding machine and is drivingly connected to the winding wheel; A conveyor belt, wherein the conveyor belt is arranged inside the winding machine for conveying the rubber hose at a differential speed; The winding wheel comprises a main body unit assembled by assembling, a gear ring 1 fixed between the two main body units and coaxial with the main body units, and a wire wheel module 1 and a wire wheel module 2 respectively mounted on the two main body units; The output end gear of the driving module is meshed and connected with the gear ring 1, the main unit is coaxially equipped with an annular track, and the wire wheel module 2 is slidably or fixedly installed on the annular track.

[0007] Preferably, the second reel module comprises a mounting frame for mounting the reel, a plurality of reels are equidistantly slidably mounted on the annular track through the mounting frame, and a plurality of the mounting frames are fixed in series through the gear ring 2; The gear ring 2 is coaxial with the main body unit and the gear ring.

[0008] Preferably, the main body unit includes an annular groove opened on its surface; The main unit is mounted on the hanger through a positioning frame, and the positioning frame includes positioning wheels arranged in a staggered manner thereon, and the positioning wheels are rollingly mounted inside the annular groove to form an interference fit therewith; A group of positioning frames are symmetrically arranged below the main unit to cooperate with the main unit.

[0009] Preferably, the gear ring 1 and the gear ring 2 are connected by a transmission module, and the transmission module includes two gears with different diameters and driven by a belt, and the two gears are respectively meshed with the gear ring 2 and the gear ring 1; The transmission module is fixed on the hanger through a bracket.

[0010] Preferably, two groups of the winding wheels and the driving modules are arranged in the winding machine along the conveying direction of the hose.

[0011] Preferably, a straightening assembly is respectively arranged between the two groups of the winding wheels, and the straightening assembly includes a limit clamp 1 arranged on both sides and a limit clamp 2 arranged in the middle and elastically offset from the limit clamp 1, and the position of the limit clamp 2 for engaging the hose is not horizontally aligned with the position of the limit clamp 1 for engaging the hose.

[0012] Preferably, the first limiting clamp and the second limiting clamp both include a fixing frame, a movable wheel and an elastic member 1 mounted on the fixing frame, and the rotating shaft of the movable wheel is elastically supported on the fixing frame by the elastic member 1. The second limiting clamp also includes an elastic push rod composed of a support rod and a second elastic member, and the elastic push rod elastically supports the fixing frame on the second limiting clamp on the main frame of the straightening assembly; The fixing frame of the first limiting clamp is fixedly mounted on the main frame of the straightening assembly.

[0013] Preferably, the support wheels on the first limiting clamp and the second limiting clamp are truncated cone-shaped and are symmetrically arranged on the outer circumference of the hose so that their oblique circumferential surfaces are in rolling contact with the outer circumference of the hose.

[0014] Preferably, a drying box is also provided on the side of the winding machine, which includes two sets of limiting rollers for limiting the position of the hose and a heater mounted on its inner wall. Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with two groups of wire wheel modules 1 and 2 on the winding wheel to carry out fiber wire winding work on the inner layer of the hose at the same station, wherein the wire wheel module 2 is installed on the annular track by sliding, and the gear ring 1 and the gear ring 2 are connected by the transmission module transmission, and the wheel diameters of the two gears on the transmission module are different, so that the speed ratio between the gear ring 1 and the gear ring 2 can be adjusted by the size of the gear wheel diameter. According to different situations, the number of coils and pitches of the two groups of spiral windings in the same direction of the winding are controlled, so that the two groups of spiral fiber lines overlap each other. Therefore, it is possible to realize the winding of staggered fiber lines on the circumference of the inner layer of the hose at the same station, and the effect is achieved without the winding wheels with different steering of multiple stations. The structure is simplified. And the structural design is compact, and the wire wheel module 1 and the wire wheel module 2 are respectively arranged on both sides of the winding wheel, and the two can be driven synchronously. And the winding of skeleton layers of different complexity can be carried out by arranging the winding wheels of multiple stations, so that a more complex skeleton layer can be constructed under the premise of using the same amount of fiber lines.

[0015] The present invention realizes the straightening of the fiber line by arranging conveyor belts at both ends of the winding machine. There is a speed difference in the rotation of the two conveyor belts, so there is a straightening effect of the hose due to the differential speed conveying.

[0016] The rubber hose is supported and straightened by using the mutually elastically displaced limit clamps 1 and 2. The limit clamps 1 at both ends keep the rubber hose aligned at the input and output ends of the straightening assembly, while the limit clamp 2 in the middle supports the rubber hose and straightens it. When the length of the rubber hose is not too long, the misalignment between limit clamps 2 and 1 is relatively small, and the rubber hose is roughly aligned. The auxiliary conveyor belts on both sides can achieve good control of the straightness of the rubber hose to prevent the defect of uneven winding caused by bending during the winding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the winding machine of the present invention; Figure 3 It is a front view schematic diagram of the winding wheel of the present invention; Figure 4 It is a top view schematic diagram of the interior of the winding wheel and straightening assembly of the present invention; Figure 5 It is a structural schematic diagram of the straightening assembly of the present invention; Figure 6 It is a structural schematic diagram of the winding wheel of the present invention; Figure 7 It is a disassembly schematic diagram of the positioning frame of the present invention; Figure 8 It is a schematic diagram of the internal structure of the winding machine and the drying box of the present invention; Fig. 9This is a schematic diagram of the construction of a single-station skeleton layer in the solution of the present invention.

[0018] In the figure: 100, winding wheel; 101, main unit; 1011, annular groove; 102, gear ring 1; 103, wire wheel module 1; 104, wire wheel module 2; 1041, mounting frame; 1042, gear ring 2; 105, annular track; 106, positioning frame; 1061, positioning wheel; 107, transmission module; 200, driving module; 300, conveyor belt; 400, straightening assembly; 401, limit clamp 1; 402, limit clamp 2; 403, fixing frame; 404, movable wheel; 405, elastic member 1; 406, support rod; 407, elastic member 2; 500, drying box; 501, limit roller; 502, heater. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figures 1 to 9 As shown, the present invention provides a hose skeleton layer winding machine, comprising a winding wheel 100, which is installed inside the winding machine through a hanger. A driving module 200, wherein the driving module 200 is installed on the winding machine and is drivingly connected to the winding wheel 100; A conveyor belt 300, wherein the conveyor belt 300 is arranged inside the winding machine for conveying the hose at a differential speed; The winding wheel 100 includes a main body unit 101 formed by splicing, a gear ring 102 fixed between two main body units 101 and coaxial with the main body unit 101, and a wire wheel module 1 103 and a wire wheel module 2 104 respectively installed on the two main body units 101; The output end gear of the driving module 200 is meshedly connected with the gear ring 1 102 , and a ring track 105 is coaxially mounted on the main unit 101 , and the wire wheel module 2 104 is slidably or fixedly installed on the ring track 105 .

[0021] By arranging two groups of wire wheel modules 1 103 and wire wheel modules 2 104 on the winding wheel 100 to perform fiber wire winding work on the inner layer of the hose at the same station, and wherein the wire wheel module 2 104 can be slidably installed on the annular track 105, it means that a speed difference will be formed between it and the wire wheel module 1 103, and it can be adjusted. Therefore, it is possible to achieve staggered fiber wire winding on the circumference of the inner layer of the hose at the same station, and there is no need for winding wheels 100 with different rotation directions at multiple stations to achieve this effect. The structure is simplified. And the structural design is compact, and the wire wheel module 1 103 and the wire wheel module 2 104 are respectively arranged on both sides of the winding wheel 100, and the two can be driven synchronously.

[0022] The above solution can be used with a multi-station winding machine, such as Figure 1 As shown, it is a double-station winding wheel 100, which can be used to wind a skeleton layer with a more complex configuration to improve the strength of the skeleton layer.

[0023] like Figure 3 As shown, the second reel module 104 includes a mounting frame 1041 for mounting the reel, and a plurality of reels are equidistantly slidably mounted on the annular track 105 through the mounting frame 1041, and a plurality of the mounting frames 1041 are fixed in series through a second gear ring 1042; The gear ring 2 1042 is coaxial with the main unit 101 and the gear ring 1 102 .

[0024] The gear ring 2 1042 fixes a plurality of mounting frames 1041 in series, so that the mounting frames 1041 can rotate synchronously. When the mounting frames 1041 are slidably mounted on the annular track 105, the rotation speed of the winding module formed by the plurality of mounting frames 1041 and the wire wheel can be adjusted to form a differential speed with the wire wheel module 1 103, thereby adjusting the difference in the number of turns of the winding fiber line, thereby forming a staggered crimping effect between the fiber lines.

[0025] like Figure 7 As shown, the main body unit 101 includes an annular groove 1011 opened on its surface; The main unit 101 is installed on the hanger through the positioning frame 106, and the positioning frame 106 includes positioning wheels 1061 arranged alternately thereon, and the positioning wheels 1061 are rollingly installed inside the annular groove 1011 to form an interference fit therewith; A group of positioning frames 106 are symmetrically arranged below the main unit 101 to cooperate with the main unit 101 .

[0026] The positioning wheel 1061 is supported inside the annular groove 1011, which has a limiting effect on the main unit 101 and is a rotating bracket of the main unit 101. There is one positioning wheel 1061 at the upper and lower parts of the main unit 101, which is used to stabilize the rotation state of the main unit 101. The positioning wheels 1061 are supported on the outer circumference and inner circumference of the inner groove of the annular groove 1011 respectively, and the positioning wheels 1061 are interlaced with each other and have an interference fit with the inner and outer circumference of the annular groove 1011, that is, rolling contact. The two main units 101 located on both sides are provided with positioning frames 106 for limiting them, so as to fully ensure the rotation stability of the main unit 101.

[0027] like Figure 3 and Figure 6 As shown, the gear ring 102 and the gear ring 2 1042 are connected to each other through a transmission module 107. The transmission module 107 includes two gears with different diameters and driven by a belt. The two gears are respectively meshed with the gear ring 2 1042 and the gear ring 1 102. The transmission module 107 is fixed on the hanger through a bracket.

[0028] The two gears on the transmission module 107 have different wheel diameters, so the speed ratio between the gear ring 102 and the gear ring 2 1042 can be adjusted by the size of the gear wheel diameter. The number of coils and pitch of the two sets of spiral windings in the same direction are controlled according to different situations, so that the two sets of spiral fiber lines overlap each other. Fig. 9 As shown, the spiral directions of the two groups of fiber lines are consistent, and one group of fiber lines covers the other group of fiber lines, forming a mutually crimped and staggered form. The effect obtained after implementing this solution is to avoid the two groups of fiber lines being staggered when rotating in the same direction due to the consistent winding speed along the circumference of the hose. They cannot be crimped to each other, which reduces the strength of the skeleton layer.

[0029] As for the transmission module 107 controlling the rotation speed ratio between the gear ring 1 102 and the gear ring 2 1042 , it can be implemented according to pre-planned specifications, and the crimping effect between the two groups of fiber lines can be adjusted according to actual conditions.

[0030] like Figure 1 , 2 As shown in FIG. 4 , two groups of the winding wheels 100 and the driving modules 200 are arranged in the winding machine along the conveying direction of the hose.

[0031] The two sets of winding wheels 100 are driven by the driving module 200 to rotate in opposite directions, so that the winding directions of the two sets of winding wheels 100 on the hose are opposite, so that the windings of the two sets of winding wheels 100 can cover each other to the greatest extent, forming an interlaced dense skeleton layer.

[0032] like Figure 4 As shown, a straightening assembly 400 is respectively arranged between the two groups of winding wheels 100, and the straightening assembly 400 includes a limit clamp 1 401 arranged on both sides and a limit clamp 2 402 arranged in the middle and elastically offset from the limit clamp 1 401, and the position of the limit clamp 2 402 for engaging the hose is not horizontally aligned with the position of the limit clamp 1 401 for engaging the hose.

[0033] When the length of the rubber hose between the two winding wheels 100 is long, in order to prevent the rubber hose from being too long and bent and thus not being able to be straightened, the rubber hose is supported by the mutually elastically displaced limit clamp 1 401 and limit clamp 2 402 to make it straight. The limit clamp 1 401 at both ends keeps the rubber hose aligned at the input and output ends of the straightening assembly 400, while the limit clamp 2 402 in the middle supports the rubber hose to make it straight. When the rubber hose is not too long, the misalignment between the limit clamp 2 402 and the limit clamp 1 401 is relatively small, and the rubber hose is kept roughly aligned.

[0034] The straightening assembly 400 is used to keep the hose in a straight state between the two winding wheels 100, and the limit clamps 401 located at both ends align the clamping position between the hose and the axis of the two winding wheels 100, thereby keeping the hose in a straight state to accept the winding work.

[0035] like Figure 3-5 As shown, the limiting clamp 1 401 and the limiting clamp 2 402 both include a fixing frame 403 and a movable wheel 404 and an elastic member 1 405 mounted on the fixing frame 403. The rotating shaft of the movable wheel 404 is elastically supported on the fixing frame 403 by the elastic member 1 405. The second limiting clamp 402 also includes an elastic push rod composed of a support rod 406 and a second elastic member 407, and the elastic push rod elastically supports the fixing frame 403 on the second limiting clamp 402 on the main frame of the straightening assembly 400; The fixing frame 403 of the limiting clamp 1 401 is fixedly mounted on the main frame of the straightening assembly 400 .

[0036] The misalignment between the second limiting clamp 402 and the first limiting clamp 401 is achieved by the cooperation between the support rod 406 and the second elastic member 407. When the length of the rubber hose between the two sets of winding wheels 100 is too long, the second limiting clamp 402 is supported by the second elastic member 407 to extend as a whole so that the rubber hose is arched, thereby straightening the rubber hose. This prevents the rubber hose from bending due to its own length, and allows the rubber hose delivered to the winding wheel 100 to remain straight.

[0037] The movable wheel 404 is used to roll on the outer periphery of the hose, and has a certain elasticity through the elastic member 405. It can adapt to hoses of different specifications, and at the same time, the movable wheel 404 can be rolled on the surface of the hose more firmly, which has a better limiting effect on it.

[0038] like Figure 3 and Figure 5 As shown, the support wheels on the limiting clamp 1 401 and the limiting clamp 2 402 are truncated cone-shaped and are symmetrically arranged on the outer circumference of the hose so that their oblique circumferential surfaces are in rolling contact with the outer circumference of the hose.

[0039] Each of the limiting clamps 1 401 and 2 402 is provided with four movable wheels 404, which are divided into two groups, left and right, and are located on both sides of the hose. The four support wheels limit the hose in the middle in four directions. The oblique circumference of the support wheel is in rolling contact with the circumference of the hose. The movable wheels 404 are elastically mounted on the fixing frame 403 through the elastic member 1 405, so the contact between the support wheel and the hose is elastic. The spacing between the movable wheels 404 can be elastically adjusted according to the diameter of the hose.

[0040] like Figure 8 As shown, a drying box 500 is also provided on the side of the winding machine, which includes two sets of limiting rollers 501 for limiting the position of the hose, and also includes a heater 502 mounted on its inner wall.

[0041] The drying box 500 is mainly used to dehumidify the water-cooled hose. In order to avoid excessive moisture on it, the surface moisture of the hose is removed by drying and dehumidification to prevent the surface moisture from evaporating and leaving cavitation inside the hose when the second layer of the hose is formed. It is also to remove moisture before winding to avoid the fiber being stained with moisture after winding, which makes it difficult to remove the moisture later. The limiting roller 501 is used to limit the hose in transportation, and the hose is located between two rows of limiting rollers 501. However, the heater 502 is arranged on the inner wall of the drying box 500, located behind the limiting roller 501, to heat and dry the hose. At the same time, the hose itself has residual heat that can evaporate the moisture on it.

[0042] The working principle and use process of the present invention: By arranging two groups of wire wheel modules 1 103 and wire wheel modules 2 104 on the winding wheel 100, the fiber wire winding work is performed on the inner layer of the hose at the same station, and the wire wheel module 2 104 can be slidably installed on the annular track 105, and the gear ring 1 102 and the gear ring 2 1042 are connected by transmission module 107. The transmission module 107 includes two gears with different diameters and driven by a belt. The two gears are respectively meshed with the gear ring 2 1042 and the gear ring 1 102, and the transmission module 107 is fixed on the hanger through a bracket. The wheel diameters of the two gears on the transmission module 107 are different, so the speed ratio between the gear ring 1 102 and the gear ring 2 1042 can be adjusted by the size of the gear wheel diameter. According to different situations, the number of coils and pitches of the two groups of spiral windings in the same direction of the winding are controlled to be different, so that the two groups of spiral fiber lines overlap each other. By setting a multi-station winding wheel 100, a more complex skeleton layer can be constructed.

[0043] In addition, the rubber hose is supported and straightened by using the mutually elastically displaced limit clamp 1 401 and limit clamp 2 402. The limit clamp 1 401 at both ends keeps the rubber hose aligned at the input and output ends of the straightening assembly 400, while the limit clamp 2 402 in the middle supports and straightens the rubber hose. When the rubber hose is not too long, the displacement between the limit clamp 2 402 and the limit clamp 1 401 is relatively small, and the rubber hose is kept roughly aligned.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hose skeleton layer winding machine, characterized in that: It comprises a winding wheel (100) which is installed inside the winding machine via a hanger. A driving module (200), the driving module (200) being mounted on the winding machine and drivingly connected to the winding wheel (100); A conveyor belt (300), wherein the conveyor belt (300) is arranged inside the winding machine and is used for differentially conveying the rubber hose; The winding wheel (100) comprises a main body unit (101) formed by assembling, a toothed ring (102) fixed between the two main body units (101) and coaxial with the main body units (101), and a wire wheel module (103) and a wire wheel module (104) respectively mounted on the two main body units (101); The output end gear of the driving module (200) is meshedly connected with the gear ring 1 (102), the main unit (101) is coaxially mounted with an annular track (105), and the wire wheel module 2 (104) is slidably or fixedly mounted on the annular track (105).

2. The hose skeleton layer winding machine according to claim 1, characterized in that: The second reel module (104) comprises a mounting frame (1041) for mounting the reel, a plurality of reels are equidistantly slidably mounted on the annular track (105) via the mounting frame (1041), and a plurality of the mounting frames (1041) are fixedly connected in series via a second gear ring (1042); The second gear ring (1042) is coaxial with the main body unit (101) and the first gear ring (102).

3. The hose skeleton layer winding machine according to claim 2, characterized in that: The main body unit (101) comprises an annular groove (1011) formed on its surface; The main body unit (101) is mounted on the hanger via a positioning frame (106); the positioning frame (106) comprises positioning wheels (1061) arranged in a staggered manner thereon; the positioning wheels (1061) are rollingly mounted inside the annular groove (1011) to form an interference fit therewith; A group of positioning frames (106) are symmetrically arranged below the main body unit (101) and cooperate with the main body unit (101).

4. The hose skeleton layer winding machine according to claim 3 is characterized in that: The gear ring 1 (102) and the gear ring 2 (1042) are connected to each other by a transmission module (107), wherein the transmission module (107) comprises two gears with different diameters and driven by a belt, and the two gears are respectively meshed with the gear ring 2 (1042) and the gear ring 1 (102); The transmission module (107) is fixed on the hanger via a bracket.

5. A hose skeleton layer winding machine according to any one of claims 1 to 4, characterized in that: Two groups of the winding wheels (100) and the driving modules (200) are arranged in the winding machine along the conveying direction of the hose.

6. The hose skeleton layer winding machine according to claim 5, characterized in that: A straightening assembly (400) is respectively arranged between the two groups of winding wheels (100), and the straightening assembly (400) comprises a first limiting clamp (401) arranged on both sides and a second limiting clamp (402) arranged in the middle and elastically offset from the first limiting clamp (401), and the position of the second limiting clamp (402) for engaging the rubber hose is not horizontally aligned with the position of the first limiting clamp (401) for engaging the rubber hose.

7. The hose skeleton layer winding machine according to claim 6, characterized in that: The limiting clamp 1 (401) and the limiting clamp 2 (402) both include a fixed frame (403) and a movable wheel (404) and an elastic member 1 (405) mounted on the fixed frame (403). The rotating shaft of the movable wheel (404) is elastically supported on the fixed frame (403) by the elastic member 1 (405). The second limiting clamp (402) further comprises an elastic push rod formed by a support rod (406) and a second elastic member (407), wherein the elastic push rod elastically supports the fixing frame (403) on the second limiting clamp (402) on the main frame of the straightening assembly (400); The fixing frame (403) of the limiting clamp 1 (401) is fixedly mounted on the main frame of the straightening assembly (400).

8. The hose skeleton layer winding machine according to claim 7, characterized in that: The support wheels on the limiting clamp 1 (401) and the limiting clamp 2 (402) are truncated cone-shaped and are symmetrically arranged on the outer circumference of the hose so that their inclined circumferential surfaces are in rolling contact with the outer circumference of the hose.

9. The hose skeleton layer winding machine according to claim 1, characterized in that: A drying box (500) is also provided on the side of the winding machine, and comprises two sets of limiting rollers (501) for limiting the position of the rubber hose, and also comprises a heater (502) mounted on the inner wall thereof.

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