A multi-angle automatic laying device for rail transit cables

Abstract

A multi-angle automatic laying device for rail transit cables comprises a tractor and several trailers, the trailer is provided with a turntable and a plurality of traction devices, the turntable is detachably provided with a cable drum, the cable drum is wound with cables, the plurality of traction devices are distributed around the turntable, different traction devices have different traction directions, and the traction devices comprise a traction machine and a first guide mechanism which are arranged in sequence. The present invention provides a multi-angle automatic laying device for rail transit cables, which can adjust the laying direction, can meet different laying requirements, and has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the field of rail transit construction equipment, in particular to multi-angle automatic laying equipment for rail transit cables. Background Art

[0002] Urban rail transit is the backbone of urban public transportation. It has the characteristics of energy saving, land saving, large transportation capacity, all-weather, pollution-free (or less pollution) and safety. It is a green and environmentally friendly transportation system, especially suitable for large and medium-sized cities. The existing urban rail transit mainly includes subway systems, light rail systems, monorail systems, trams, maglev systems, automatic guided rail systems and urban rapid rail systems. Among them, the subway system has gradually become the main force of urban rail transit and an important goal of urban construction and development because of its characteristics of saving surface space, low noise and little impact on other transportation facilities. The subway system uses electricity as energy, so a large number of cables are needed during the construction process. Usually, a hanger is set on the inner wall of the tunnel to install the cable on the hanger. Most of the existing subway cables are packaged and transported in cable drums. Because the cable size is large, the weight of a single cable drum is usually about 6-7 tons, which makes it difficult to install the cable on the hanger. Most of the existing technologies use manual installation methods. Each section of cable requires at least 20 workers to be arranged in sequence and then lifted at the same time to be successfully installed. The speed is extremely slow and the consumption of human resources is serious.

[0003] In order to solve the above problems, Chinese patent CN202010393324.1 discloses a cable laying equipment for urban rail transit, including a tractor, which is provided with a driving device for driving the tractor to move, a supporting device for supporting the cable drum, a pay-off device for driving the cable drum to rotate, and a guide device for guiding the direction of the cable, wherein the guide device includes a primary guide mechanism and a secondary guide mechanism arranged in sequence, and the pay-off device drives the cable drum to rotate, and the cable passes through the primary guide mechanism and the secondary guide mechanism in sequence and then extends from the side of the tractor. This prior art can automatically pay-off, has a faster pay-off speed, and does not require a large amount of manpower. However, it still has shortcomings, mainly that the pay-off direction is fixed, the flexibility is poor, and the scope of application is small. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a multi-angle automatic laying device for rail transit cables, which can adjust the laying direction, meet different laying requirements, and has a wide range of applications.

[0005] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present invention is: a multi-angle automatic laying equipment for rail transit cables, including a tractor and a plurality of trailers, the trailer is provided with a turntable and a plurality of traction devices, the turntable is detachably provided with a cable drum, the cable drum is wound with cables, a plurality of traction devices are distributed on the peripheral side of the turntable, different traction devices have different traction directions, and the traction device includes a traction machine and a first guide mechanism which are arranged in sequence.

[0006] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: the first guide mechanism includes a front-end guide assembly and a rear-end guide assembly arranged in sequence, and the front-end guide assembly is close to the turntable, and the traction machine is fixedly arranged between the front-end guide assembly and the rear-end guide assembly; the front-end guide assembly includes two vertically arranged front-end side limiting rollers, and a front-end gap for accommodating cables is left between the two front-end side limiting rollers; the rear-end guide assembly includes a first rear-end support roller and a second rear-end support roller arranged in sequence, and both ends of the first rear-end support roller and the second rear-end support roller are coaxially fixed with positioning cones.

[0007] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: the rear end guide assembly includes two vertically arranged rear end side limiting rollers, and the rear end side limiting rollers are located between the first rear end support roller and the second rear end support roller.

[0008] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: two transfer bearing mechanisms are arranged on each side of the trailer, and the transfer bearing mechanism includes at least one support plate vertically fixed on the trailer, and a connecting plate is fixedly connected between the tops of all the support plates. The connecting plate is hinged to the bearing plate through a hinge, and the bearing plate is fixedly connected to the limit plate, and the travel direction of the limit plate, the bearing plate and the trailer are all perpendicular to each other.

[0009] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: one of the surfaces of the supporting plate is composed of a first transition surface, a second transition surface and a bearing surface arranged in sequence, wherein the first transition surface is an arc-shaped surface, the second transition surface and the bearing surface are both planes, and an obtuse angle is formed between the second transition surface and the bearing surface, and the bearing surface is close to the hinge.

[0010] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: one of the support plates is fixedly connected to a fixed positioning plate, the connecting plate is rotatably connected to a movable positioning plate through the hinge, and the movable positioning plate is detachably connected to the fixed positioning plate.

[0011] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: the second guide mechanism includes a base fixedly arranged on the trailer, the base is fixedly connected to at least one vertical support rod extending downward, the vertical support rod is fixedly connected to a horizontal support rod, the horizontal support rod is rotatably connected to a connecting turntable, and the connecting turntable is fixedly connected to a frame for accommodating cables.

[0012] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: a plurality of circumferential limiting rollers distributed around the cable are rotatably arranged on the inner side of the frame.

[0013] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: the turntable includes a cable rack, a movable support platform and a rotary support platform arranged in sequence from top to bottom, the cable rack includes two vertically arranged columns, the cable drum is rotatably arranged between the two columns, the movable support platform includes two movable plates distributed along a straight line, the two columns are respectively arranged on the two movable plates, and a drive and two mutually parallel slide rails are fixedly arranged on the rotary support platform, the drive is drivingly connected to the movable plate, and the slide rails are slidingly connected to the movable plate.

[0014] As a further optimization of the above-mentioned multi-angle automatic laying equipment for rail transit cables: a plurality of lining plates are fixedly arranged on the rotary support table, the upper surface of the lining plates is flush with the upper surface of the movable plate, and a notch is provided at the edge of the lining plates.

[0015] Beneficial effects: The present invention can adjust the matching relationship between the cable drum and the traction device, thereby adjusting the line-releasing direction, can meet different line-releasing requirements, and has a wide range of applications; the present invention can simultaneously use multiple trailers to achieve synchronous line-releasing of multiple cables, and the line-releasing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the trailer;

[0018] Figure 3 is a structural schematic diagram of the first guide mechanism;

[0019] Figure 4 is a rear view of the transfer carrying mechanism;

[0020] Figure 5 is a front view of the transfer bearing mechanism;

[0021] Figure 6 is a structural schematic diagram of the second guide mechanism;

[0022] Figure 7It is a structural diagram of the turntable.

[0023] Description of the drawings: 1-tractor, 2-trailer, 3-first guide mechanism, 4-transfer bearing mechanism, 5-tractor, 6-second guide mechanism, 7-turntable, 8-cable rack, 9-cable drum, 10-mounting frame, 11-front end bracket, 12-front end side limiting roller, 13-rear end bracket, 14-first rear end support roller, 15-positioning cone, 16-rear end side limiting roller, 17-second rear end support roller, 18-support plate, 19-connecting plate, 20-hinged member, 2 1-bearing plate, 22-limiting plate, 23-rotating plate, 24-movable positioning plate, 25-positioning pin, 26-fixed positioning plate, 27-pin hole, 28-first transition surface, 29-second transition surface, 30-bearing surface, 31-base, 32-vertical support rod, 33-horizontal support rod, 34-connecting turntable, 35-frame, 36-circumferential side limiting roller, 37-lining plate, 38-protection plate, 39-movable plate, 40-notch, 41-slide rail, 42-rotating support table. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figures 1 to 7 A multi-angle automatic laying device for rail transit cables includes a tractor 1 and several trailers 2. The trailer 2 is provided with a turntable 7 and multiple traction devices. The turntable 7 is detachably provided with a cable drum 9, and cables are wound on the cable drum 9. Multiple traction devices are distributed on the periphery of the turntable 7. Different traction devices have different traction directions. The traction device includes a traction machine 5 and a first guide mechanism 3 which are arranged in sequence.

[0026] When in use, the number of trailers 2 is selected according to actual needs, and then the tractor 1 and the trailers 2 are placed on the track of the rail transit, and the trailers 2 are arranged in sequence, the tractor 1 is connected to the first trailer 2, and the remaining trailers 2 are connected in sequence, and then the direction of the turntable 7 is adjusted according to the line-laying requirements, and the turntable 7 drives the cable drum 9 to rotate, thereby changing the direction of the cable drum 9, so that the active end of the cable on the cable drum 9 faces one of the traction devices, and then the tractor 1 is started, and the tractor 1 drives all the trailers 2 forward. During the process, the traction machine 5 unties the cable from the cable drum 9, and sends it out after adjusting the direction through the first guide mechanism 3, thereby completing the line laying.

[0027] The present invention can adjust the matching relationship between the cable drum 9 and the traction device, thereby adjusting the line-releasing direction, can meet different line-releasing requirements, and has a wide range of applications; the present invention can simultaneously use multiple trailers 2 to achieve synchronous line-releasing of multiple cables, and the line-releasing efficiency is higher.

[0028] The specific structure of the first guide mechanism 3 is as follows: the first guide mechanism 3 includes a front-end guide assembly and a rear-end guide assembly which are arranged in sequence, and the front-end guide assembly is close to the turntable 7, and the tractor 5 is fixedly arranged between the front-end guide assembly and the rear-end guide assembly, the front-end guide assembly includes two front-end side limiting rollers 12 which are arranged vertically, and a front-end gap for accommodating the cable is left between the two front-end side limiting rollers 12, and the rear-end guide assembly includes a first rear-end support roller 14 and a second rear-end support roller 17 which are arranged in sequence, and both ends of the first rear-end support roller 14 and the second rear-end support roller 17 are coaxially fixedly connected with a positioning cone 15. In the first guide mechanism 3, the front-end guide assembly is used to adjust the direction of the cable so that the cable can smoothly enter the input end of the tractor 5, and then the tractor 5 can smoothly unwind the cable from the cable drum 9, and the rear-end guide assembly is used to support the cable extending from the output end of the tractor 5 to prevent the cable from arching up and causing damage to the tractor 5. The positioning cone 15 is used to prevent the cable from moving toward the end of the first rear end support roller 14 or the second rear end support roller 17. When the cable contacts the positioning cone 15, it slides downward along the side of the positioning cone 15 under the action of its own gravity, thereby ensuring that the cable can fall on the first rear end support roller 14 and the second rear end support roller 17.

[0029] In order to further ensure that the first rear-end support roller 14 and the second rear-end support roller 17 can effectively support the cable, the rear-end guide assembly includes two vertically arranged rear-end lateral limiting rollers 16, and the rear-end lateral limiting rollers 16 are located between the first rear-end support roller 14 and the second rear-end support roller 17. A rear-end gap is formed between the two rear-end lateral limiting rollers 16, and the cable passes through the rear-end gap, so that the two rear-end lateral limiting rollers 16 are used to limit the cable, ensuring that the cable can be placed on the first rear-end support roller 14 and the second rear-end support roller 17.

[0030] The specific setting method of the first guide mechanism 3 is: a mounting frame 11 is fixedly provided on the trailer 2, a front end bracket 11 and a rear end bracket 13 are fixedly provided on the mounting frame 11, a front end guide component is provided on the front end bracket 11, and a rear end guide component is provided on the rear end bracket 13.

[0031] Because the laying position of some cables is lower than the platform, in order to ensure smooth cable laying, a certain gap needs to be left between the trailer 2 and the platform. At the same time, the trailer 2 should be lower than the platform, which makes it impossible to transfer the cable drum 9 directly from the platform to the turntable 7 in a translational manner. In order to facilitate the installation of the cable drum 9 on the turntable 7, two transfer bearing mechanisms 4 are provided on both sides of the trailer 2. The transfer bearing mechanism 4 includes at least one support plate 18 vertically fixed on the trailer 2, and a connecting plate 19 is fixedly connected to the top of all the support plates 18. The connecting plate 19 is hinged to a bearing plate 21 through a hinge 20. The bearing plate 21 is fixedly connected to a limiting plate 22, and the travel direction of the limiting plate 22 and the bearing plate 21 and the trailer 2 are perpendicular to each other. When installing the cable drum 9 on the turntable 7, first rotate the bearing plate 21 so that the bearing plate 21 is placed on the platform, so that the bearing plate 21 is used to form a bridge-like structure between the platform and the trailer 2, and then the cable drum 9 can be pushed onto the connecting plate 19 through the bearing plate 21, so that the cable drum 9 can be smoothly transferred to the turntable 7. During the process, the limit plate 22 can be used to limit the cable drum 9 to prevent the cable drum 9 from lateral deviation. Through the transfer bearing mechanism 4, the cable drum 9 can be transferred to the turntable 7 by pushing, without the need for large-scale lifting equipment, and the installation efficiency of the cable drum 9 is higher and the cost is lower. After the cable drum 9 is transferred to the turntable 7, the bearing plate 21 can be rotated in the opposite direction to separate the bearing plate 21 from the platform, thereby preventing the bearing plate 21 from colliding with the platform column during the movement of the cable unwinding vehicle, and protecting the bearing plate 21 and other facilities on site. It should be noted that the turntable 7 is flush with the connecting plate 19 , so that after the cable drum 9 falls onto the connecting plate 19 , it can be directly translated onto the turntable 7 , further improving the installation efficiency of the cable drum 9 .

[0032] In order to enable the cable drum 9 to be smoothly transferred to the carrying plate 21, one of the surfaces of the carrying plate 21 is composed of a first transition surface 28, a second transition surface 29 and a bearing surface 30 arranged in sequence, wherein the first transition surface 28 is an arcuate surface, the second transition surface 29 and the bearing surface 30 are both planes, and an obtuse angle is formed between the second transition surface 29 and the bearing surface 30, and the bearing surface 30 is close to the hinge 20. When the carrying plate 21 is placed on the platform, the bearing surface 30 is flush with the connecting plate 19, and the first transition surface 28 and the second transition surface 29 make a smooth transition between the platform and the bearing surface 30, so that the cable drum 9 can be smoothly transferred from the platform to the carrying plate 21.

[0033] In order to ensure that the load-bearing plate 21 can remain stable during the movement of the wire-releasing vehicle, one of the support plates 18 is fixedly connected to a fixed positioning plate 26, and the connecting plate 19 is rotatably connected to a movable positioning plate 24 through a hinge 20, and the movable positioning plate 24 is detachably connected to the fixed positioning plate 26. After the cable drum 9 is transferred to the turntable 7 by the transfer bearing mechanism 4, the load-bearing plate 21 is rotated. Because the load-bearing plate 21 and the movable positioning plate 24 are both connected to the hinge 20, the load-bearing plate 21 can drive the movable positioning plate 24 to rotate synchronously during the rotation of the load-bearing plate 21, until the load-bearing plate 21 is rotated to a vertical state, the movable positioning plate 24 is connected to the fixed positioning plate 26, and the position of the load-bearing plate 21 can be fixed, thereby ensuring that the load-bearing plate 21 can remain stable during the movement of the wire-releasing vehicle. In this embodiment, the hinge 21 includes a sleeve fixedly connected to the connecting plate 19, a rotating shaft is rotatably provided in the sleeve, the load-bearing plate 21 is fixedly connected to the rotating shaft, the rotating shaft is also fixedly connected to a rotating plate 23, and the movable positioning plate 24 is fixedly connected to the rotating plate 23.

[0034] In this embodiment, the specific detachable connection method of the movable positioning plate 24 and the fixed positioning plate 26 is: a positioning pin 25 is pierced on the movable positioning plate 24, and a pin hole 27 matching the positioning pin 25 is opened on the fixed positioning plate 26. When the movable positioning plate 24 rotates to be parallel to the fixed positioning plate 26, the positioning pin 25 is inserted into the pin hole 27, and the movable positioning plate 24 and the fixed positioning plate 26 can be connected together by using the positioning pin 25, so that the position of the movable positioning plate 24 is fixed by using the fixed positioning plate 26 and the positioning pin 25, and then the position of the rotating shaft and the bearing plate 21 is fixed, so as to achieve the effect of keeping the bearing plate 21 stable. In other embodiments of the present invention, the movable positioning plate 24 and the fixed positioning plate 26 can also be connected by means of snap connection, bolt connection or magnetic connection.

[0035] The specific structure of the second guide mechanism 6 is as follows: the second guide mechanism 6 includes a base 31 fixedly arranged on the trailer 2, the base 31 is fixedly connected with at least one vertical support rod 32 extending downward, the vertical support rod 32 is fixedly connected with a horizontal support rod 33, the horizontal support rod 33 is rotatably connected with a connecting turntable 34, and the connecting turntable 34 is fixedly connected with a frame 35 for accommodating cables. After passing through the rear end guide assembly of the first guide mechanism 3, the cables pass through the two frames 35 in sequence, and the two frames 35 are used to guide the cables. Because the connecting turntable 34 is rotatably arranged, the frame 35 can be flexibly rotated to adapt to the direction of the cables, and there is no need to specifically adjust the frame 35.

[0036] In order to ensure that the cable can move smoothly in the frame 35 and avoid excessive wear on the frame 35, a plurality of peripheral limiting rollers 36 distributed around the cable are rotatably arranged inside the frame 35.

[0037] The specific structure of the turntable 7 is as follows: the turntable 7 includes a cable rack 8, a mobile support platform and a swivel support platform 42 which are arranged in sequence from top to bottom. The cable rack 8 includes two vertically arranged columns. The cable drum 9 is rotatably arranged between the two columns. The mobile support platform includes two movable plates 39 distributed along a straight line. The two columns are respectively arranged on the two movable plates 39. A driver and two mutually parallel slide rails 41 are fixedly arranged on the swivel support platform 42. The driver is connected to the movable plates 39 by driving, and the slide rails 41 are connected to the movable plates 39 by sliding. Before the cable drum 9 is transferred to the turntable 7, the two movable plates 39 are first driven by the driver to move in the opposite direction. During the movement of the movable plates 30, the columns of the cable rack 8 are driven to move in the opposite direction, so that the distance between the two columns is greater than the axial length of the cable drum 9. After the cable drum 9 is transferred to the turntable, the driver drives the two movable plates 39 to move toward each other, so that the two columns clamp the cable drum 9, and then the cable drum 9 can rotate on the cable rack 8 to achieve the release of the cable. In the present invention, the cable rack 8 can adopt the existing technology. The rotary support platform 42 can be driven by a motor, which is a mature existing technology and will not be described in detail here. The driver can adopt existing technologies such as hydraulic cylinder or screw slider mechanism.

[0038] In order to enable the cable drum 9 to smoothly move to the turntable 7 after passing through the connecting plate 19, a plurality of lining plates 37 are fixedly arranged on the rotary support table 42, the upper surface of the lining plate 37 is flush with the upper surface of the moving plate 39, a notch 40 is provided at the edge of the lining plate 37, and the upper surfaces of the lining plate 37 and the moving plate 39 are both flush with the upper surface of the connecting plate 19. The notch 40 is used for preliminary guiding of the cable, and the cable first passes through the notch 40 after being untied from the cable drum 9.

[0039] A protection plate 38 is also provided on the turntable 7 , and the driver is provided between the protection plate 38 and the rotary support platform 42 , so that the protection plate 38 is used to protect the driver.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-angle automatic laying device for rail transit cables, comprising a tractor (1) and a plurality of trailers (2), characterized in that: The trailer (2) is provided with a turntable (7) and a plurality of traction devices, the turntable (7) is detachably provided with a cable drum (9), a cable is wound around the cable drum (9), the plurality of traction devices are distributed around the turntable (7), different traction devices have different traction directions, and the traction devices include a traction machine (5) and a first guide mechanism (3) which are arranged in sequence; The first guide mechanism (3) comprises a front guide assembly and a rear guide assembly which are arranged in sequence, and the front guide assembly is close to the turntable (7), and the traction machine (5) is fixedly arranged between the front guide assembly and the rear guide assembly; The front end guide assembly comprises two front end side limiting rollers (12) arranged vertically, and a front end gap for accommodating the cable is left between the two front end side limiting rollers (12); The rear end guide assembly comprises a first rear end support roller (14) and a second rear end support roller (17) which are arranged in sequence, and both ends of the first rear end support roller (14) and both ends of the second rear end support roller (17) are coaxially fixedly connected with positioning cones (15); The rear end guide assembly comprises two rear end lateral limiting rollers (16) arranged vertically, and the rear end lateral limiting rollers (16) are located between the first rear end supporting roller (14) and the second rear end supporting roller (17); Two transfer bearing mechanisms (4) are respectively arranged on both sides of the trailer (2), the transfer bearing mechanism (4) comprising at least one support plate (18) vertically fixed on the trailer (2), a connecting plate (19) being fixedly connected to the tops of all the support plates (18), the connecting plate (19) being hingedly connected to a bearing plate (21) via a hinge (20), the bearing plate (21) being fixedly connected to a limit plate (22), the limit plate (22) being perpendicular to the bearing plate (21) and the moving directions of the trailer (2); One of the surfaces of the bearing plate (21) is composed of a first transition surface (28), a second transition surface (29), and a bearing surface (30) which are arranged in sequence, wherein the first transition surface (28) is an arcuate surface, the second transition surface (29) and the bearing surface (30) are both planes, and an obtuse angle is formed between the second transition surface (29) and the bearing surface (30), and the bearing surface (30) is close to the hinge (20).

2. The multi-angle automatic laying equipment for rail transit cables according to claim 1, characterized in that: One of the support plates (18) is fixedly connected to a fixed positioning plate (26), and the connecting plate (19) is rotatably connected to a movable positioning plate (24) via the hinge (20), and the movable positioning plate (24) is detachably connected to the fixed positioning plate (26).

3. The multi-angle automatic laying equipment for rail transit cables according to claim 1, characterized in that: The second guide mechanism (6) further comprises a base (31) fixedly arranged on the trailer (2), the base (31) being fixedly connected to at least one vertical support rod (32) extending downward, the vertical support rod (32) being fixedly connected to a horizontal support rod (33), the horizontal support rod (33) being rotatably connected to a connecting turntable (34), and the connecting turntable (34) being fixedly connected to a frame (35) for accommodating cables.

4. The multi-angle automatic laying equipment for rail transit cables according to claim 3, characterized in that: A plurality of peripheral limiting rollers (36) distributed around the cable are rotatably arranged inside the frame (35).

5. The multi-angle automatic laying equipment for rail transit cables according to claim 1, characterized in that: The turntable (7) comprises a cable rack (8), a movable support platform and a swivel support platform (42) which are arranged in sequence from top to bottom. The cable rack (8) comprises two vertically arranged columns. The cable drum (9) is rotatably arranged between the two columns. The movable support platform comprises two movable plates (39) distributed along a straight line. The two columns are respectively arranged on the two movable plates (39). A driver and two mutually parallel slide rails (41) are fixedly arranged on the swivel support platform (42). The driver is drivingly connected to the movable plate (39), and the slide rails (41) are slidably connected to the movable plate (39).

6. The multi-angle automatic laying equipment for rail transportation cables according to claim 5, characterized in that: A plurality of lining plates (37) are fixedly arranged on the rotary support platform (42); the upper surface of the lining plates (37) is flush with the upper surface of the movable plate (39); and a notch (40) is provided at the edge of the lining plates (37).

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