Novel belt conveyor

Abstract

The utility model discloses a novel belt conveyor, and belongs to the field of belt conveying. The novel belt conveyor comprises a conveyor support, a transmission device, a plurality of carrier roller sets and a controller. The carrier roller set comprises a carrier roller support, a horizontal fixing shaft, a lateral fixing shaft, a horizontal rotating roller and a lateral rotating roller. Protruding blocks are arranged on the end face of the inner side of the conveying belt in the same direction, a plurality of continuous grooves are formed in the circumferential face of the horizontal rotating roller in the axial direction, and the protruding blocks are movably connected with the grooves in a clamped mode. A ratchet wheel and pawl assembly is further included, the end, close to the first flat roller supporting leg, of the horizontal rotating roller is coaxially and fixedly connected with a ratchet wheel, and a pawl is rotationally connected to the upper portion of the first flat roller supporting leg and movably meshed with gear teeth of the ratchet wheel; and the controller is electrically connected with the driving motor. The ratchet wheel and the pawl are matched to avoid reverse rotation of the horizontal carrier roller, the protruding blocks arranged on the conveying belt can be embedded into the grooves formed in the horizontal carrier roller, and the non-return function of the conveying belt is achieved.

Description

Technical Field

[0001] The utility model relates to the field of belt conveying, in particular to a novel belt conveyor. Background Art

[0002] The belt conveyor is a closed loop conveyor belt that is wound around and tensioned on the front and rear rollers at the same time, and the rotation of the rollers is used to drive the conveyor belt to move continuously. The belt conveyor has the following advantages: simple structure, convenient manufacturing, low production cost, and convenient on-site installation; strong adaptability in terms of conveying route layout and conveying material types, long conveying distance, high speed, and low unit energy consumption; during the conveying process, the working state is balanced and the conveyed materials will not be damaged. Belt conveyors are widely used in mining, docks, steel and other fields.

[0003] A large part of belt conveyors are inclined climbing belts. When the belt conveyor stops carrying materials due to various reasons, the belt conveyor is prone to reverse under the action of the gravity of the materials. After the belt reverses, it is easy for the material to be unloaded from the tail wheel of the belt conveyor to the ground and other production accidents, which is also easy to cause safety accidents. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a novel belt conveyor, which realizes the function of preventing the conveyor belt from returning by arranging a ratchet pawl assembly on a roller group and arranging a protruding block on the conveyor belt.

[0005] The utility model provides the following technical solutions:

[0006] A novel belt conveyor comprises a conveyor support, a transmission device and a controller;

[0007] The transmission device includes a driving motor and a rotating roller fixed on the conveyor bracket. The rotating roller is sleeved with a conveyor belt. The driving motor rotates to drive the conveyor belt to move.

[0008] A plurality of roller groups are fixedly arranged along the length direction of the conveyor support, the roller group includes a roller support, a horizontal fixed shaft fixedly arranged on the roller support, lateral fixed shafts on the outer sides of both ends of the horizontal fixed shaft, a horizontal rotating roller and a lateral rotating roller, the horizontal rotating roller is coaxially arranged on the horizontal fixed shaft, and the lateral rotating roller is coaxially arranged on the lateral fixed shaft;

[0009] The roller bracket includes a bottom support beam and a support leg fixed on the bottom support beam, a fixed shaft installation groove is opened on the support leg, a horizontal fixed shaft and a lateral fixed shaft are inserted into the fixed shaft installation groove, the support leg includes a side roller outer support leg, a side roller inner support leg, a flat roller first support leg and a flat roller second support leg, the lateral rotating roller is arranged between the side roller outer support leg and the side roller inner support leg, and the horizontal rotating roller is arranged between the flat roller first support leg and the flat roller second support leg;

[0010] The inner end surface of the conveyor belt is provided with a plurality of continuous protrusions in the same direction, the protrusions include a protruding arc portion and a protruding straight edge portion connecting the arc portion, the circumferential surface of the horizontal rotating roller is provided with a plurality of continuous grooves along the axial direction, the grooves include an arc-shaped concave edge and a groove straight edge connecting the arc-shaped concave edges, and the protrusions are movably engaged with the grooves;

[0011] It also includes a ratchet pawl assembly, wherein one end of the horizontal roller close to the first support leg of the flat roller is coaxially fixedly connected with a ratchet, and the upper part of the first support leg of the flat roller is rotatably connected with a pawl that cooperates with the ratchet through a bolt, and the pawl is arranged between the first support leg of the flat roller and the horizontal roller, and a nut is arranged at the end of the bolt to limit the position of the pawl, the tooth end of the ratchet wheel faces counterclockwise, and the pawl teeth of the pawl face clockwise, and the pawl is movably meshed with the teeth of the ratchet wheel;

[0012] The controller is electrically connected to the driving motor to control the operation and stop of the new belt conveyor.

[0013] Furthermore, the bottom support beam of the roller support is a right-angle steel beam, and the left and right sides of the bottom support beam are respectively a first inclined surface and a second inclined surface symmetrical about the vertical plane of the top angle of the right-angle steel beam;

[0014] The outer supporting legs of the side rollers and the inner supporting legs of the side rollers are fixedly arranged on the first inclined surface, the first supporting legs of the flat rollers and the second supporting legs of the flat rollers are fixedly arranged on the second inclined surface, and the bottom supporting beam and the supporting legs are fixedly connected by welding;

[0015] The horizontal roller is located in the space between the two lateral rollers, and the horizontal roller and the lateral roller are staggered and distributed along the length direction of the conveyor support.

[0016] Furthermore, a stiffening rib plate corresponding to the position of the supporting legs is arranged in the bottom space of the bottom supporting beam.

[0017] Furthermore, the new belt conveyor also includes: a ratchet control part, the ratchet control part includes an electric telescopic rod electrically connected to the controller arranged above the side of the first support leg of the flat roller away from the horizontal roller, a connecting platform fixed on the top of the electric telescopic rod and a connecting rod fixed on the ratchet; an electric telescopic rod electrically connected to the controller is arranged above the side of the first support leg of the flat roller away from the horizontal roller, and a connecting platform is arranged on the top of the electric telescopic rod; a non-penetrating hole groove is opened on the flat roller first support leg side of the ratchet near the ratchet tooth end, a connecting rod is inserted into the hole groove, and the connecting rod rests on the upper surface of the connecting platform.

[0018] Furthermore, a ratchet screw mounting hole is provided on the ratchet, the ratchet screw mounting hole is a countersunk hole, and a roller screw mounting hole corresponding to the ratchet screw mounting hole is provided at one end of the horizontal roller, and the ratchet is fixedly connected to the horizontal roller by a screw.

[0019] The utility model has the following beneficial effects:

[0020] (1) The cooperation between the ratchet and the pawl prevents the horizontal roller from reversing. The raised block provided on the conveyor belt can be embedded in the groove provided on the horizontal roller, thus realizing the reverse stop function of the conveyor belt;

[0021] (2) The horizontal rollers and the lateral rollers are staggered along the length of the conveyor support, ensuring that the horizontal fixed axis will not affect the rotation of the two lateral rollers, providing installation space for the ratchet and pawl, and also extending the service life of the conveyor belt;

[0022] (3) The setting of the electric telescopic rod can avoid the friction between the pawl and the ratchet during the normal operation of the conveyor belt, and at the same time avoid the noise generated by the operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional diagram of the normal operation state of the new belt conveyor;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 This is a front view of the new belt conveyor in normal operation;

[0026] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 It is a three-dimensional diagram of the reverse-stop state of the new belt conveyor;

[0028] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0029] Figure 7 This is the front view of the new belt conveyor in the non-return state;

[0030] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0031] Fig. 9 It is a three-dimensional diagram of a conveyor belt;

[0032] Fig.10 for Fig. 9 A partial enlarged view of point E in the middle;

[0033] Fig.11 It is a three-dimensional diagram of the roller group;

[0034] Fig.12 for Fig.11 A partial enlarged view of point F in the middle;

[0035] Fig.13 It is a top view of the roller assembly;

[0036] Fig.14 for Fig.13 A partial enlarged view of the G in the middle;

[0037] Fig.15 The three-dimensional structure of the roller support Figure 1 ;

[0038] Fig.16 The three-dimensional structure of the roller support Figure 2 ;

[0039] Fig.17 It is a top view of the roller support;

[0040] Fig.18 is a three-dimensional diagram of the first supporting leg of the flat roller;

[0041] Fig.19 is a three-dimensional diagram of a horizontal rotating roller;

[0042] Fig. 20 is a three-dimensional diagram of a ratchet;

[0043] Fig.21 A three-dimensional diagram of the pawl.

[0044] Among them, 1. conveyor bracket; 2. conveyor belt; 21. raised block; 211. raised arc portion; 212. raised straight edge portion; 3. roller bracket; 31. bottom support beam; 311. first inclined surface; 312. second inclined surface; 32. support leg; 321. fixed shaft mounting groove; 322. side roller outer support leg; 323. side roller inner support leg; 324. flat roller first support leg; 3241. bolt hole; 325. flat roller second support leg ; 33. Stiffening rib plate; 4. Horizontal fixed axis; 5. Lateral fixed axis; 6. Horizontal roller; 61. Groove; 611. Arc concave edge; 612. Groove straight edge; 62. Roller screw mounting hole; 7. Lateral roller; 8. Ratchet and pawl assembly; 81. Ratchet; 811. Screw mounting hole; 82. Pawl; 821. Hole groove; 83. Bolt; 84. Nut; 9. Pawl control unit; 91. Electric telescopic rod; 92. Connecting platform; 93. Connecting rod. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1 to 21The technical scheme of the utility model is clearly and completely described in the following specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0046] The embodiment of the utility model provides a novel belt conveyor, comprising a conveyor support 1, a transmission device and a controller.

[0047] The transmission device includes a driving motor and a rotating roller fixed on the conveyor support 1, and a conveyor belt 2 is sleeved on the rotating roller; the driving motor rotates to drive the conveyor belt 2. The structure of the transmission device is a conventional transmission setting, and the embodiment of the utility model will not be described in detail.

[0048] A plurality of roller groups are fixedly arranged along the length direction of the conveyor support 1, and are used to support the conveyor belt 2. The roller group includes a roller support 3, a horizontal fixed shaft 4 fixedly arranged on the roller support 3, lateral fixed shafts 5 on the outer sides of the two ends of the horizontal fixed shaft 4, a horizontal roller 6 and a lateral roller 7. The horizontal roller 6 is coaxially arranged on the horizontal fixed shaft 4, and the lateral roller 7 is coaxially arranged on the lateral fixed shaft 5.

[0049] The roller bracket 3 includes a bottom support beam 31 and a support leg 32 fixed on the bottom support beam 31, a fixed shaft mounting groove 321 is opened on the support leg 32, a horizontal fixed shaft 4 and a lateral fixed shaft 5 are inserted into the fixed shaft mounting groove 321, the support leg 32 includes a side roller outer support leg 322, a side roller inner support leg 323, a flat roller first support leg 324 and a flat roller second support leg 325, a lateral rotating roller 7 is arranged between the side roller outer support leg 322 and the side roller inner support leg 323, and a horizontal rotating roller 6 is arranged between the flat roller first support leg 324 and the flat roller second support leg 325. Fig.15 and Fig.17 shown.

[0050] The inner end surface of the conveyor belt 2 is provided with a plurality of continuous protrusions 21 in the same direction. The protrusions 21 include a protruding arc portion 211 and a protruding straight edge portion 212 connecting the arc portions. Fig. 9 and Fig.10 The circumferential surface of the horizontal roller 6 is provided with a plurality of continuous grooves 61 along the axial direction, and the grooves 61 include arc-shaped concave edges 611 and groove straight edges 612 connecting the arc-shaped concave edges 611, as shown in FIG. Fig.19As shown, the protruding block 21 is movably engaged with the groove 61 .

[0051] The utility model also includes a ratchet pawl assembly 8, wherein one end of the horizontal roller 6 close to the first flat roller support leg 324 is coaxially fixedly connected with a ratchet 81, and the upper part of the first flat roller support leg 324 is rotatably connected with a ratchet 82 cooperating with the ratchet 81 through a bolt 83, and the ratchet 82 is transversely arranged above the ratchet 81, and the ratchet 82 is arranged between the first flat roller support leg 324 and the horizontal roller 6, and a nut 84 is arranged at the end of the bolt 83 to limit the position of the ratchet 82, such as Fig.14 The tooth end of the ratchet wheel 81 faces counterclockwise, and the ratchet teeth of the pawl 82 face clockwise, and the pawl 82 is movably engaged with the teeth of the ratchet wheel 81. A through bolt hole 3241 is provided on the upper portion of the first support leg 324 of the flat roller, as shown in FIG. Fig.18 As shown, the bolt 83 passes through the bolt hole 3241 and is rotatably connected to the pawl 82. The ratchet 81 is provided with a ratchet screw mounting hole 811. Fig. 20 As shown, the ratchet screw mounting hole 811 is a countersunk hole, and one end of the horizontal roller 6 is provided with a roller screw mounting hole 62 corresponding to the ratchet screw mounting hole 811, and the ratchet 81 is fixedly connected to the horizontal roller 6 by screws. The ratchet pawl assembly is convenient for installation and removal and replacement.

[0052] The controller is electrically connected to the driving motor to control the operation and stop of the new belt conveyor.

[0053] During normal operation: the upper belt of the conveyor belt 2 rotates to the right, driving the horizontal roller 6 and the lateral roller 7 to rotate clockwise, the pawl teeth of the pawl 82 move with the gear teeth of the ratchet wheel 81, the ratchet wheel 81 and the pawl 82 will not hinder the rotation of the horizontal roller 6, and the protrusion 21 of the conveyor belt 2 will not enter the groove 61. Figure 2 and Figure 4 shown.

[0054] When reversal occurs, the upper belt of the conveyor belt 2 rotates to the left, driving the horizontal roller 6 and the lateral roller 7 to rotate counterclockwise, and the teeth of the ratchet 82 of the ratchet 82 are embedded between the teeth of the ratchet wheel 81, so that the horizontal roller stops rotating counterclockwise. At the same time, the raised block 21 of the conveyor belt 2 is embedded in the groove 61, and the raised straight edge 212 of the raised block 21 of the conveyor belt 2 is connected with the straight edge 612 of the groove 61 of the horizontal roller 6, and the raised arc-shaped portion 211 of the raised block 21 of the conveyor belt 2 is at the position of the arc-shaped concave edge 611 of the groove 61 of the horizontal roller 6, as shown in FIG. Figure 6 and Figure 8 shown.

[0055] A ratchet 81 is arranged at the end of the horizontal roller 6, and a ratchet 82 cooperating with the ratchet 81 is rotatably connected to the upper part of the first support leg 324 of the flat roller. A groove 61 is provided on the horizontal roller 6, and the raised block 21 of the conveyor belt 2 is embedded in the groove 61 to play a reverse stop role. Multiple roller groups with brake structures work together to keep the conveyor belt 2 in a stopped state, avoiding the danger of the conveyor belt 2 reversing.

[0056] Furthermore, the bottom support beam 31 of the roller support 3 is a right-angle steel beam, and the left and right sides of the bottom support beam 31 are respectively a first inclined surface 311 and a second inclined surface 312 symmetrical about the vertical plane of the right-angle steel beam top angle. The side roller outer support leg 322 and the side roller inner support leg 323 are fixedly arranged on the first inclined surface 311, and the flat roller first support leg 324 and the flat roller second support leg 325 are fixedly arranged on the second inclined surface 312. Fig.17 As shown. The bottom support beam 31 and the support leg 32 are fixedly connected by welding. The horizontal roller 6 is located in the space between the two lateral rollers 7. The horizontal roller 6 and the lateral roller 7 are staggered and distributed along the length direction of the conveyor support 1. Fig.11 and Fig.13 shown.

[0057] The staggered arrangement of the horizontal roller 6 and the lateral roller 7 ensures that the horizontal fixed axis 4 extending to the outer sides of the flat roller first support leg 324 and the flat roller second support leg 325 of the roller bracket 3 will not affect the rotation of the two lateral rollers 7; at the same time, without changing the sizes of the horizontal roller 6 and the lateral roller 7, installation space is provided for the ratchet 81 and the pawl 82; in addition, a central depression is formed between the two lateral rollers 7, and the conveyor belt 2 will not directly bend and abut against the horizontal roller 6 when carrying materials, so that a transition area is formed, which can protect the conveyor belt 2 and thus extend the service life of the conveyor belt 2.

[0058] In order to enhance the supporting function of the bottom support beam 31, a stiffening rib 33 corresponding to the position of the support leg 32 is arranged in the bottom space of the bottom support beam 31. Fig.16 shown.

[0059] In order to avoid the friction between the pawl 82 and the ratchet wheel 81 and the noise generated by the operation of the equipment during normal operation, the new belt conveyor of the utility model embodiment further includes a pawl control unit 9, which includes an electric telescopic rod 91 electrically connected to the controller and arranged above the side of the flat roller first support leg 324 away from the horizontal roller 6, a connecting platform 92 fixedly arranged on the top of the electric telescopic rod 91, and a connecting rod 93 fixed on the pawl 82. A non-through hole 821 is provided on the flat roller first support leg 324 side of the pawl 82 near the tooth end of the pawl 82, such as Fig.21As shown, a connecting rod 93 is inserted into the hole 821, and the connecting rod 93 abuts against the upper surface of the connecting platform 92. When the conveyor is operating normally, the pawl tooth end of the pawl 82 is away from the gear teeth of the ratchet wheel 81, and the pawl 82 is in a lifted state. The movable rod of the electric telescopic rod 91 pushes up the connecting platform 92, and then pushes up the connecting rod 93, so that the pawl 82 is lifted up. Figure 2 When the controller detects that the conveyor is reversed, the controller controls the movable rod of the electric telescopic rod 91 to descend, driving the position of the connecting rod 93 to descend, and the tooth end of the pawl 82 of the pawl 82 presses against the gear teeth of the ratchet wheel 81, as shown in FIG. Figure 6 As shown, the conveyor belt 2 is prevented from reversing.

[0060] The roller bracket 3, the pawl 82 and the ratchet wheel 81 are respectively made of 316L stainless steel, which has good corrosion resistance and atmospheric corrosion resistance, good high temperature strength, and can be used under harsh conditions.

[0061] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model. They should all be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A novel belt conveyor, comprising a conveyor support (1), a transmission device and a controller; The transmission device comprises a driving motor and a rotating roller fixed on a conveyor support (1); a conveyor belt (2) is sleeved on the rotating roller; the driving motor rotates to drive the conveyor belt (2) to move; Features: A plurality of roller groups are fixedly arranged along the length direction of the conveyor support (1), the roller groups comprising a roller support (3), a horizontal fixed shaft (4) fixedly arranged on the roller support (3), lateral fixed shafts (5) on the outer sides of both ends of the horizontal fixed shaft (4), a horizontal rotating roller (6) and a lateral rotating roller (7), the horizontal rotating roller (6) being coaxially arranged on the horizontal fixed shaft (4), and the lateral rotating roller (7) being coaxially arranged on the lateral fixed shaft (5); The roller support (3) comprises a bottom support beam (31) and a support leg (32) fixed on the bottom support beam (31); a fixed shaft installation groove (321) is provided on the support leg (32); a horizontal fixed shaft (4) and a lateral fixed shaft (5) are inserted into the fixed shaft installation groove (321); the support leg (32) comprises a side roller outer support leg (322), a side roller inner support leg (323), a flat roller first support leg (324) and a flat roller second support leg (325); a lateral rotating roller (7) is arranged between the side roller outer support leg (322) and the side roller inner support leg (323); and a horizontal rotating roller (6) is arranged between the flat roller first support leg (324) and the flat roller second support leg (325); The inner end surface of the conveyor belt (2) is provided with a plurality of continuous protrusions (21) in the same direction, the protrusions (21) comprising a protruding arc portion (211) and a protruding straight edge portion (212) connecting the arc portion, the circumferential surface of the horizontal rotating roller (6) is provided with a plurality of continuous grooves (61) along the axial direction, the grooves (61) comprising an arc-shaped concave edge (611) and a groove straight edge (612) connecting the arc-shaped concave edge (611), and the protrusions (21) are movably engaged with the grooves (61); It also includes a ratchet pawl assembly (8), wherein one end of the horizontal roller (6) close to the first flat roller support leg (324) is coaxially fixedly connected with a ratchet (81), and the upper part of the first flat roller support leg (324) is rotatably connected with a ratchet (82) that cooperates with the ratchet (81) through a bolt (83), and the ratchet (82) is arranged between the first flat roller support leg (324) and the horizontal roller (6), and a nut (84) is arranged at the end of the bolt (83) to limit the position of the ratchet (82), the tooth end of the ratchet (81) faces counterclockwise, and the ratchet teeth of the ratchet (82) face clockwise, and the ratchet (82) is movably meshed with the teeth of the ratchet (81); The controller is electrically connected to the driving motor to control the operation and stop of the new belt conveyor.

2. The new belt conveyor according to claim 1 is characterized in that: The bottom support beam (31) of the roller support (3) is a right-angle steel beam, and the left and right sides of the bottom support beam (31) are respectively a first inclined surface (311) and a second inclined surface (312) symmetrical about the vertical plane of the top angle of the right-angle steel beam; The side roller outer support leg (322) and the side roller inner support leg (323) are fixedly arranged on the first inclined surface (311), the flat roller first support leg (324) and the flat roller second support leg (325) are fixedly arranged on the second inclined surface (312), and the bottom support beam (31) and the support leg (32) are fixedly connected by welding; The horizontal roller (6) is located in the space between the two lateral rollers (7), and the horizontal roller (6) and the lateral rollers (7) are staggered and distributed along the length direction of the conveyor support (1).

3. The new belt conveyor according to claim 2 is characterized in that: A stiffening rib plate (33) corresponding to the position of the support leg (32) is arranged in the bottom space of the bottom support beam (31).

4. The new belt conveyor according to claim 1 is characterized in that: Also includes: A ratchet control unit (9), the ratchet control unit (9) comprising an electric telescopic rod (91) electrically connected to a controller and arranged above a side of the flat roller first support leg (324) away from the horizontal roller (6), a connecting platform (92) fixedly arranged on the top of the electric telescopic rod (91), and a connecting rod (93) fixed on the ratchet (82); An electric telescopic rod (91) electrically connected to the controller is arranged above the side of the first support leg (324) of the flat roller away from the horizontal rotating roller (6), and a connecting platform (92) is arranged on the top of the electric telescopic rod (91); A non-through hole groove (821) is provided on the flat roller first supporting leg (324) side of the ratchet (82) near the tooth end of the ratchet (82), a connecting rod (93) is inserted into the hole groove (821), and the connecting rod (93) abuts against the upper surface of the connecting platform (92).

5. The new belt conveyor according to claim 1 is characterized in that: A ratchet screw mounting hole (811) is provided on the ratchet wheel (81), and the ratchet screw mounting hole (811) is a countersunk hole. A roller screw mounting hole (62) corresponding to the ratchet screw mounting hole (811) is provided at one end of the horizontal roller (6). The ratchet wheel (81) is fixedly connected to the horizontal roller (6) by means of a screw.

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