Component conveying line

Abstract

The invention discloses a component conveying line which comprises a goods shelf, prompters, a control terminal, a component box and a conveying mechanism, the goods shelf is provided with a plurality of containing spaces used for containing to-be-sorted components, each containing space is provided with a feeding port and a discharging port opposite to the feeding port, the prompters are installed on the edges of the discharging ports, and the control terminal is connected with the control terminal. The control terminal is in communication connection with the prompter, the component box is provided with a plurality of containing grooves used for containing different components, the conveying mechanism comprises a conveying frame, a conveying belt, a recycling assembly and a sending-out assembly, the conveying frame is suitable for conveying the component box to the sending-out assembly from the recycling assembly, and the conveying belt is suitable for conveying the component box to the sending-out assembly. The sending-out assembly is suitable for conveying the component boxes on the conveying frame to the conveying belt, the recycling assembly is suitable for conveying the component boxes on the conveying belt to the conveying frame, the occupied space of the component conveying line is small, and the component selecting and matching errors can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of vehicle component assembly and transportation, and in particular to a component conveyor line. Background Art

[0002] In the production process of automobile seats, a variety of parts of different sizes and shapes are needed. The parts provided by suppliers are all provided according to uniform specifications. After receiving the parts, the staff need to select the required parts according to the production products, and then supply the selected parts to the production staff for assembly and production.

[0003] However, in the process of selecting parts, it is easy to make wrong selections or miss parts, which will cause production personnel to re-use parts, affecting production efficiency. In addition, if the parts shelves are set up next to the various work positions on the production line, they will need to occupy a large space, making each position occupy a large area, resulting in a large overall design of the production line and a waste of site use. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to invent a component conveyor line that occupies less space and can effectively reduce component selection errors.

[0005] A parts conveying line, comprising:

[0006] A shelf, wherein a plurality of storage spaces are provided on the shelf for placing the parts to be sorted, and the storage space is provided with a feed port and a discharge port opposite to the feed port;

[0007] A reminder device is installed on the edge of the discharge port;

[0008] A control terminal, connected in communication with the prompter;

[0009] The parts box is provided with a plurality of placement slots for accommodating different parts, and the shapes of the placement slots correspond to the shapes of the parts one by one;

[0010] The transmission mechanism includes a transmission frame, a conveyor belt, a recovery component and a delivery component. The recovery component is installed at one end of the transmission frame, and the delivery component is installed at the other end of the transmission frame. The transmission frame is suitable for transporting the component box from the recovery component to the delivery component, and the delivery component is suitable for transferring the component box on the transmission frame to the conveyor belt. The recovery component is suitable for transferring the component box on the conveyor belt to the transmission frame.

[0011] Furthermore, a label is provided at the edge of the discharge port, and the surface of the label is provided with the number information, coding information and picture information of the component.

[0012] Furthermore, it also includes an electric cabinet door installed at the discharge port, and the electric cabinet door is communicatively connected to the control terminal.

[0013] Furthermore, a reference label is provided at the edge of the placement slot, and the surface of the reference label is provided with item number information, coding information and picture information.

[0014] Furthermore, the prompter includes a prompt light and a sensor, and both the prompt light and the sensor are communicatively connected to the control terminal.

[0015] Furthermore, a sliding surface is formed on the surface of the transmission rack to slide with the component box, one end of the sliding surface in the length direction is a recovery end, and the other end is a delivery end, the recovery component is arranged at the recovery end, and the delivery component is arranged at the delivery end.

[0016] Furthermore, the delivery assembly includes a delivery drive cylinder, a feeding piece and a feeding connecting piece, the feeding connecting piece is arranged between the transmission frame and the conveyor belt and is inclined, one end of the feeding connecting piece is connected to the transmission frame, and the other end is connected to the conveyor belt, the feeding piece is installed on the driving end of the delivery drive cylinder, the surface of the feeding piece is inclined, a first opening is opened on the delivery end surface, and the delivery drive cylinder is installed in the first opening, when the component box moves to above the first opening, the delivery drive cylinder is suitable for driving the feeding piece to extend out of the first opening, so that the feeding piece abuts against the bottom of the component box, so as to drive the component box to slide along the surface of the feeding piece to the feeding connecting piece, and slide along the surface of the feeding connecting piece to the conveyor belt.

[0017] Furthermore, the recovery component includes a recovery frame, a recovery cylinder, a connecting seat, a recovery rod and a recovery paddle. The recovery frame is provided with a recovery channel, the entrance of the recovery channel faces the conveyor belt, and the exit of the recovery channel faces the transmission frame. The recovery cylinder is installed on the recovery frame, and the connecting seat is installed on the driving end of the recovery cylinder. One end of the recovery rod is fixed to the connecting seat, and the other end is hinged to the recovery paddle. The recovery rod and the recovery paddle have a limiter at the hinged end, and the limiter is suitable for limiting the rotation direction of the recovery paddle.

[0018] Furthermore, the recovery component also includes a lifting recovery cylinder and a recovery component, the recovery component is obliquely installed at the driving end of the lifting recovery cylinder, the outlet of the recovery channel faces the recovery end, and a second opening is opened at the bottom of the recovery channel, the second opening is arranged at a position close to the outlet of the recovery channel, the lifting recovery cylinder is installed in the second opening, when the parts box slides along the recovery channel to the outlet of the recovery channel, the lifting recovery cylinder drives the recovery component to extend out of the second opening, so that the recovery component abuts against the parts box, so as to drive the parts box to move from the outlet of the recovery channel to the recovery end.

[0019] Furthermore, a roller is arranged on the surface of the sliding surface.

[0020] Beneficial effects:

[0021] The present invention provides a plurality of storage spaces for storing parts to be sorted on the shelf, so that the parts can be placed in a centralized manner, which saves space and is convenient for staff to quickly find and take the correct parts; the set prompters cooperate with the control terminal, and the control terminal can control the prompters to light up in sequence, and the staff can take the parts according to the order in which the prompters light up, so as to reduce the probability of taking the wrong parts, and the corresponding part shape placement slots are opened on the part box, so as to reduce the probability of taking the wrong parts in multiple aspects, and because the placement slots are adapted to the shape of the parts, the parts can be effectively prevented from shaking in the placement slots during transportation, which may cause damage to the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a parts conveying line of the present invention;

[0023] Figure 2 for Figure 1 Magnified view at A in the middle;

[0024] Figure 3 It is a structural schematic diagram of a transmission mechanism in a parts conveying line of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a delivery component in a parts conveying line of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a delivery driving cylinder in a parts conveying line of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a recycling component in a parts conveying line of the present invention;

[0028] Figure 7 It is a structural schematic diagram of another angle of a recycling component in a parts conveying line of the present invention;

[0029] Figure 8 It is a structural schematic diagram of a lifting and recovery cylinder in a parts conveying line of the present invention;

[0030] Figure numerals: 10, shelf; 101, storage space; 20, prompter; 201, prompt light; 202, sensor; 30, parts box; 40, transmission mechanism; 401, transmission rack; 402, conveyor belt; 403, recovery component; 4031, recovery rack; 4032, recovery cylinder; 4033, connecting seat; 4034, recovery rod; 4035, recovery paddle; 4036, recovery channel; 4037, limiter; 4038, lifting recovery cylinder; 4039, recovery part; 404, delivery component; 4041, delivery drive cylinder; 4042, feeding part; 4043, feeding connecting part; 4044, first opening. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0032] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-8 As shown, a parts conveying line includes

[0036] The shelf 10 is provided with a plurality of storage spaces 101 for placing the parts to be sorted, and the storage spaces 101 are provided with a feed port and a discharge port opposite to the feed port;

[0037] A reminder 20 is installed at the edge of the discharge port;

[0038] A control terminal, in communication with the prompter 20;

[0039] The component box 30 is provided with a plurality of placement slots for accommodating different components, and the shapes of the placement slots correspond to the shapes of the components.

[0040] The transmission mechanism 40 includes a transmission frame 401, a conveyor belt 402, a recovery component 403 and a delivery component 404. The recovery component 403 is installed at one end of the transmission frame 401, and the delivery component 404 is installed at the other end of the transmission frame 401. The transmission frame 401 is suitable for transporting the component box 30 from the recovery component 403 to the delivery component 404, and the delivery component 404 is suitable for transferring the component box 30 on the transmission frame 401 to the conveyor belt 402. The recovery component 403 is suitable for transferring the component box 30 on the conveyor belt 402 to the transmission frame 401.

[0041] When the present invention is in use, the staff places the same type of parts in the same storage space 101. When the parts required by the production line are equipped, the control terminal controls the indicator 20 to light up, and the staff takes out the parts from the discharge port where the indicator 20 lights up, and places the parts in the corresponding placement slots on the parts box 30. After the parts box 30 is full, the staff places the parts box 30 on the transmission rack 401, and the transmission rack 401 transfers the parts box 30 to the delivery component 404, which is then transferred to the conveyor belt 402 by the delivery component 404. The conveyor belt 402 transports the full parts box 30 to the production line. The staff takes out the parts box 30 filled with parts, and places the empty parts box 30 on the conveyor belt 402, which is then transferred to the transmission rack 401 by the recycling component 403.

[0042] The present invention provides a plurality of storage spaces 101 for storing parts to be sorted on the shelf 10, so that the parts can be placed in a centralized manner, which saves space and is convenient for staff to quickly find and take the correct parts; the set prompter 20 cooperates with the control terminal, and the control terminal can control the prompter 20 to light up in sequence, and the staff can take the parts according to the order in which the prompter 20 lights up, so as to reduce the probability of taking the wrong parts, and the corresponding part shape placement slots are opened on the part box 30, so as to reduce the probability of taking the wrong parts in multiple aspects, and because the placement slots are adapted to the shape of the parts, the parts can be effectively prevented from shaking in the placement slots during transportation, which may cause damage to the parts.

[0043] Specifically, in order to further reduce the probability of wrong parts taking, in the present invention, a label is also provided on the edge of each discharge port, and the numbering information, coding information and picture information of the parts contained in the storage space 101 corresponding to the discharge port are provided on the surface of the label. When taking the parts, the staff can match the numbering information and coding information marked on the parts with the coding information and encoding information on the label, thereby effectively reducing the probability of wrong parts taking.

[0044] In addition, in the present embodiment, a reference label is provided on the edge of the placement slot, and the surface of the reference label is provided with item number information, coding information and picture information. When placing parts, the staff can compare the part number information and coding information marked on the parts with the item number information, coding information and picture information on the reference label. By checking multiple aspects of information, the probability of taking the wrong parts can be effectively reduced.

[0045] Specifically, in the present invention, an electric cabinet door is also installed at the discharge port, and the electric cabinet door is communicatively connected with the control terminal.

[0046] During operation, the control terminal sequentially controls the indicator 20 corresponding to the discharge port to light up, the electric cabinet door to open, and the other electric cabinet doors to close, thereby effectively avoiding the wrong removal of parts.

[0047] In addition, the prompter 20 includes a prompt light 201 and a sensor 202 , and both the prompt light 201 and the sensor 202 are communicatively connected to the control terminal.

[0048] During operation, the control terminal controls the prompt light 201 to light up, the staff takes out the parts from the discharge port where the prompt light 201 is lit, and then touches the sensor 202. The sensor 202 transmits the pickup information to the control terminal. After receiving the pickup information, the control terminal controls the currently lit prompt light 201 and the opened electric cabinet door to close, and then controls the next sequence of prompt lights 201 and electric cabinet doors to open, and the staff picks up the parts.

[0049] In order to facilitate the sliding of the component box 30 along the surface of the transmission rack 401, in the present embodiment, a sliding surface that slides with the component box 30 is formed on the surface of the transmission rack 401, so that the staff can push the component box 30 to slide along the surface of the transmission rack 401 after filling the component box 30. Specifically, one end of the sliding surface in the length direction is the recovery end, and the other end is the delivery end. The recovery component 403 is arranged at the recovery end, and the delivery component 404 is arranged at the delivery end.

[0050] In addition, in order to facilitate the component box 30 to slide along the sliding surface, in this embodiment, rollers are provided on the sliding surface.

[0051] Of course, a belt driven by a motorized roller may also be used on the sliding surface.

[0052] In the present invention, the delivery assembly 404 includes a delivery drive cylinder 4041, a feeder 4042 and a feeder connector 4043. The feeder connector 4043 is disposed between the transmission frame 401 and the conveyor belt 402 and is disposed obliquely. One end of the feeder connector 4043 is connected to the transmission frame 401, and the other end is connected to the conveyor belt 402. The feeder 4042 is mounted on the driving end of the delivery drive cylinder 4041. The surface of the feeder 4042 is disposed obliquely. The surface of the delivery end is provided with a first An opening 4044 is formed, and a delivery driving cylinder 4041 is installed in the first opening 4044. When the component box 30 moves to above the first opening 4044, the delivery driving cylinder 4041 is suitable for driving the feeding piece 4042 to extend out of the first opening 4044, so that the feeding piece 4042 abuts against the bottom of the component box 30, so as to drive the component box 30 to slide along the surface of the feeding piece 4042 to the feeding connecting piece 4043, and slide along the surface of the feeding connecting piece 4043 to the conveyor belt 402.

[0053] During operation, the component box 30 moves to the first opening 4044, the delivery drive cylinder 4041 is started, driving the feeding piece 4042 to extend out of the first opening 4044, and the feeding piece 4042 contacts the bottom of the component box 30. Since the feeding piece 4042 is arranged at an angle, after the component box 30 contacts the feeding piece 4042, it can slide along the inclined surface of the feeding piece 4042 to the feeding connector 4043, and is transported to the conveyor belt 402 through the inclined feeding connector 4043, and then transported to the production line by the conveyor belt 402.

[0054] Of course, in order to prevent the component box 30 from falling from both ends of the transmission rack 401 when the transmission rack 401 transmits the component box 30 , component box 30 baffles are provided at both ends of the transmission rack 401 to block the component box 30 .

[0055] In this embodiment, the feeding member 4042 can be composed of two roller groups that are parallel to each other and arranged at intervals, and a fixed frame connecting the roller group and the delivery drive cylinder 4041. The roller group is composed of multiple rollers with parallel axes, and the multiple rollers are evenly arranged along the same straight line. With this arrangement, firstly, the contact area between the feeding member 4042 and the component box 30 can be reduced, and the relative friction between the two can be reduced. Secondly, the arrangement of the rollers makes it convenient for the component box 30 to slide toward the feeding connector 4043 when the feeding member 4042 pushes the component box 30.

[0056] In addition, to facilitate the transportation of the component box 30, in this embodiment, the feeding connector 4043 can be composed of two roller groups that are parallel to each other and spaced apart, and to prevent falling from both sides, a baffle is also installed on the opposite side of the two roller groups.

[0057] Preferably, in this embodiment, the recovery component 403 includes a recovery frame 4031, a recovery cylinder 4032, a connecting seat 4033, a recovery rod 4034 and a recovery paddle 4035. A recovery channel 4036 is provided on the recovery frame 4031. The entrance of the recovery channel 4036 faces the conveyor belt 402, and the outlet of the recovery channel 4036 faces the transmission frame 401. The recovery cylinder 4032 is installed on the recovery frame 4031, and the connecting seat 4033 is installed on the driving end of the recovery cylinder 4032. One end of the recovery rod 4034 is fixedly connected to the connecting seat 4033, and the other end is hinged to the recovery paddle 4035. The recovery rod 4034 and the recovery paddle 4035 have a limit member 4037 at the hinged end, and the limit member 4037 is suitable for limiting the rotation direction of the recovery paddle 4035.

[0058] During operation, the conveyor belt 402 transports the component box 30 to the entrance position of the recycling channel 4036, and the recycling cylinder 4032 drives the recycling rod 4034 to move toward the entrance direction. During this process, the recycling paddle 4035 will contact the box wall of the component box 30 and rotate around the hinged end with the recycling rod 4034, so that it can pass over the box wall of the component box 30. After passing over the box wall of the component box 30, the recycling paddle 4035 will be reset under the action of gravity, so that part of the recycling paddle 4035 can fall into the component box 3 0, and then, the recovery cylinder 4032 drives the recovery rod 4034 to move toward the exit direction, and the recovery paddle 4035 will abut against the inner wall of the component box 30. Due to the blocking effect of the limit member 4037, after the recovery paddle 4035 abuts against the component box 30, it will not rotate relative to the component box 30, so that during the movement of the recovery rod 4034 toward the exit direction, the recovery paddle 4035 can drive the component box 30 to move together and enter the recovery channel 4036, and be transported to the transfer rack 401 via the recovery channel 4036.

[0059] In addition, in order to facilitate the movement of the component box 30 along the recovery channel 4036 to the transfer rack 401, in the present embodiment, the recovery channel 4036 is inclined, and the entrance height of the recovery channel 4036 is higher than the exit height of the recovery channel 4036, so that the component box 30 can slide along the inclined recovery channel 4036 to the transfer rack 401 after entering the recovery channel 4036. Of course, in order to further facilitate the sliding of the component box 30, rollers can be set on the bottom surface of the recovery channel 4036 or a motor-driven transmission roller can be used.

[0060] More specifically, in the present invention, the recovery component 403 also includes a lifting recovery cylinder 4038 and a recovery component 4039. The recovery component 4039 is obliquely installed at the driving end of the lifting recovery cylinder 4038. The outlet of the recovery channel 4036 faces the recovery end. A second opening is provided at the bottom of the recovery channel 4036. The second opening is arranged at a position close to the outlet of the recovery channel 4036. The lifting recovery cylinder 4038 is installed in the second opening. When the component box 30 slides along the recovery channel 4036 to the outlet of the recovery channel 4036, the lifting recovery cylinder 4038 drives the recovery component 4039 to extend out of the second opening so that the recovery component 4039 abuts against the component box 30 to drive the component box 30 to move from the outlet of the recovery channel 4036 to the recovery end.

[0061] When the component box 30 moves along the inclined recovery channel 4036 to the exit of the recovery channel 4036, at this time, the component box 30 will be located above the second opening, and the lifting recovery cylinder 4038 will be started, driving the recovery part 4039 to extend out of the second opening and contact with the component box 30. After the component box 30 contacts the recovery part 4039, it will slide along the inclined surface of the recovery part 4039, thereby sliding out through the exit of the recovery channel 4036 and falling onto the transmission rack 401; and in order to facilitate the sliding of the component box 30 relative to the recovery part 4039 and the recovery channel 4036, in this embodiment, rollers can be set on the surface of the recovery channel 4036 and the recovery part 4039, or the recovery channel 4036 and the recovery part 4039 can be set as a roller group composed of multiple rollers, or two roller groups composed of multiple rollers can be used, as long as the sliding of the component box 30 is convenient.

[0062] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A parts conveyor line, characterized in that: include A shelf, wherein a plurality of storage spaces are provided on the shelf for placing the parts to be sorted, and the storage space is provided with a feed port and a discharge port opposite to the feed port; A reminder device is installed on the edge of the discharge port; A control terminal, connected in communication with the prompter; The parts box is provided with a plurality of placement slots for accommodating different parts, and the shapes of the placement slots correspond to the shapes of the parts one by one; The transmission mechanism includes a transmission frame, a conveyor belt, a recovery component and a delivery component. The recovery component is installed at one end of the transmission frame, and the delivery component is installed at the other end of the transmission frame. The transmission frame is suitable for transporting the component box from the recovery component to the delivery component, and the delivery component is suitable for transferring the component box on the transmission frame to the conveyor belt. The recovery component is suitable for transferring the component box on the conveyor belt to the transmission frame.

2. A parts conveyor line according to claim 1, characterized in that: A label is also provided at the edge of the discharge port, and the surface of the label is provided with the number information, coding information and picture information of the component.

3. A parts conveyor line according to claim 1, characterized in that: It also includes an electric cabinet door installed at the discharge port, and the electric cabinet door is communicatively connected with the control terminal.

4. A parts conveyor line according to claim 1, characterized in that: A comparison label is arranged at the edge of the placement slot, and the surface of the comparison label is arranged with article number information, coding information and picture information.

5. A parts conveyor line according to claim 1 or 3, characterized in that: The prompter includes a prompt light and a sensor, and both the prompt light and the sensor are communicatively connected with the control terminal.

6. The parts conveying line according to claim 1, characterized in that: The surface of the transmission rack is formed with a sliding surface that slidably cooperates with the component box. One end of the sliding surface in the length direction is a recovery end, and the other end is a delivery end. The recovery component is arranged at the recovery end, and the delivery component is arranged at the delivery end.

7. A parts conveyor line according to claim 6, characterized in that: The delivery assembly includes a delivery drive cylinder, a feeding piece and a feeding connecting piece. The feeding connecting piece is arranged between the transmission frame and the conveyor belt and is inclined. One end of the feeding connecting piece is connected to the transmission frame, and the other end is connected to the conveyor belt. The feeding piece is installed on the driving end of the delivery drive cylinder. The surface of the feeding piece is inclined. A first opening is opened on the surface of the delivery end. The delivery drive cylinder is installed in the first opening. When the component box moves above the first opening, the delivery drive cylinder is suitable for driving the feeding piece to extend out of the first opening so that the feeding piece abuts against the bottom of the component box, so as to drive the component box to slide along the surface of the feeding piece to the feeding connecting piece, and slide along the surface of the feeding connecting piece to the conveyor belt.

8. The parts conveying line according to claim 6, characterized in that: The recovery component includes a recovery frame, a recovery cylinder, a connecting seat, a recovery rod and a recovery paddle. The recovery frame is provided with a recovery channel, the entrance of the recovery channel faces the conveyor belt, and the exit of the recovery channel faces the transmission frame. The recovery cylinder is installed on the recovery frame, and the connecting seat is installed on the driving end of the recovery cylinder. One end of the recovery rod is fixed to the connecting seat, and the other end is hinged to the recovery paddle. The recovery rod and the recovery paddle have a limiter at the hinged end, and the limiter is suitable for limiting the rotation direction of the recovery paddle.

9. A parts conveying line according to claim 8, characterized in that: The recovery component also includes a lifting recovery cylinder and a recovery component. The recovery component is obliquely installed at the driving end of the lifting recovery cylinder. The outlet of the recovery channel faces the recovery end. A second opening is provided at the bottom of the recovery channel. The second opening is arranged at a position close to the outlet of the recovery channel. The lifting recovery cylinder is installed in the second opening. When the parts box slides along the recovery channel to the outlet of the recovery channel, the lifting recovery cylinder drives the recovery component to extend out of the second opening so that the recovery component abuts against the parts box to drive the parts box to move from the outlet of the recovery channel to the recovery end.

10. The parts conveying line according to claim 6, characterized in that: The sliding surface is provided with rollers.

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