Multi-clamping-position automatic production system of digital machining center

Abstract

The utility model provides a digital machining center multi-clamping-position automatic production system, and relates to the technical field of machining, the digital machining center multi-clamping-position automatic production system comprises a multi-clamping-position workbench and a positioning mechanism, and the multi-clamping-position workbench is located on the positioning mechanism and connected with the positioning mechanism; the multi-clamping-position workbench comprises a clamping position unit and a switching mechanism, the clamping position unit is detachably arranged on the switching mechanism, and the switching mechanism is used for changing the position of the clamping position unit in the multi-clamping-position workbench; the positioning mechanism comprises a sliding assembly and a driving device, and the sliding assembly is located on one side of the driving device and connected with the driving device; the sliding assembly is fixedly connected with the multi-clamping-position workbench. According to the system, the multi-clamping-position workbench is accurately positioned to a machining area in the mode that the multi-clamping-position workbench is combined with the positioning mechanism, machining errors are avoided, meanwhile, the clamping position units are rotated through the switching mechanism, workers can conveniently and rapidly replace the clamping position units, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a multi-clamping position automatic production system for a digital machining center. Background Art

[0002] A digital machining center refers to a machine tool that implements machining control using numerical control technology, or a machine tool equipped with a numerical control system, called a numerical control (NC) machine tool, which can perform various machining operations on workpieces within a certain range.

[0003] With the continuous development of the economy and the continuous progress of the manufacturing industry, the demand for high-precision, high-efficiency, and low-cost machining is increasing day by day. Along with this, the workpieces and machining processes are becoming more and more complex, which puts forward new requirements for the manufacturing process. When mass customization production is required, due to different workpieces having different shapes and specifications, the single-clamping position or conventional multi-clamping position design of digital machining centers in the prior art can no longer meet the needs of simultaneous production of multiple workpieces or rapid fixture replacement for different workpieces. If it is necessary to adapt to workpieces of more specifications, for the single-clamping position design, the fixture needs to be frequently replaced, resulting in a long fixture assembly time and low production efficiency. For the conventional multi-clamping position design, it is not convenient to replace the fixture, and frequent fixture replacement will also increase the workload of the staff, which is not conducive to reducing labor costs. Summary of the Utility Model

[0004] Aiming at the deficiencies in the prior art, the utility model provides a multi-clamping position automatic production system for a digital machining center, which solves the problems that a single-clamping position cannot machine multiple workpieces simultaneously, and when machining different workpieces, the fixture needs to be frequently replaced, resulting in a long fixture assembly time and low production efficiency, and the conventional multi-clamping position is not convenient for replacing the fixture.

[0005] The utility model provides a multi-clamping-position automatic production system for a digital machining center, which comprises a multi-clamping-position workbench and a positioning mechanism. The multi-clamping-position workbench is located on the positioning mechanism and is connected to the positioning mechanism. The multi-clamping-position workbench comprises a clamping unit and a switching mechanism. The clamping unit is detachably arranged on the switching mechanism, and the switching mechanism is used for changing the position of the clamping unit in the multi-clamping-position workbench. The positioning mechanism comprises a sliding component and a driving device. The sliding component is located on one side of the driving device and is connected to the driving device. The sliding component is fixedly connected to the multi-clamping-position workbench. In this system, both ends of the clamping unit are detachably connected to the switching mechanism. One end is inserted into the switching mechanism, and the other end is threadedly connected to the switching mechanism. Therefore, different workpieces can be fixed by connecting different clamping units, so as to realize the switching processing of multiple workpieces. During processing, the sliding component is connected to the bottom of the multi-clamping-position workbench, and the driving device drives the sliding component to move, so that the multi-clamping-position workbench changes its position, which is convenient for processing at different positions of the workpiece. At the same time, the switching mechanism is detachably connected to the clamping unit, and the switching mechanism can drive the clamping unit to rotate, so as to quickly switch workpieces. The system can use the movement of the multi-clamping-position workbench to separate the end of the clamping unit inserted into the switching mechanism from the switching mechanism, and then manually remove the other end. In this way, it is convenient for the staff to quickly replace the clamping unit.

[0006] In a preferred technical solution of the utility model, the clamping unit comprises a fixing plate and a mounting component. The mounting component is inserted into the switching mechanism, and one end of the fixing plate is detachably connected to the mounting component. The switching mechanism comprises a switching ring and a rotating shaft. The switching ring is fixed on the sliding component. A connecting plate is installed in the switching ring. The mounting component is inserted into one side of the switching ring, and the rotating shaft is connected to the connecting plate. In this preferred solution, the fixing plate is used to receive and fixedly connect the workpiece. Locking parts such as screws can be used to fix the workpiece on the fixing plate. One end of the fixing plate is connected to the mounting component, so as to be inserted into the switching ring. The relatively opposite end of the fixing plate is fixedly connected to one side of another switching ring, so as to fix the position of the workpiece in the multi-clamping-position workbench. The detachable connection design between the fixing plate and the mounting component is beneficial to appropriately replace the corresponding fixing plate according to workpieces of different sizes, and realize modular installation. The connecting plate in the switching ring is connected to the rotating shaft, and at the same time, the rotating shaft is rotatably connected to the support, so that the switching ring can be rotated to drive the clamping unit to rotate.

[0007] In a preferred technical solution of the present utility model, the sliding assembly includes a linear guide rail and a moving seat; the linear guide rail is installed on the base, and the moving seat is fixed to the bottom of the multi-clamping position workbench and is slidably connected to the linear guide rail. In this solution, the linear guide rail is vertically arranged on the base relative to the switching ring, and the moving seat is installed at the bottom of the multi-clamping position workbench to support the multi-clamping position workbench. A sliding strip matching the two linear guide rails and a transverse support beam for connecting the left and right sliding strips are fixed under the moving seat. By slidably connecting the sliding strip with the linear guide rail, the multi-clamping position workbench can be driven by the driving device to move back and forth in a direction parallel to the fixed plate, facilitating the change of the machining position of the workpiece.

[0008] In a preferred technical solution of the present utility model, the installation assembly has an installation ring, and the installation ring is inserted into the insertion opening on the switching ring. The installation assembly is inserted on the switching ring through the installation ring, and the installation assembly can be fixed by inserting a pin into the installation ring, improving the installation stability.

[0009] In a preferred technical solution of the present utility model, a plurality of clamping position units are detachably connected to the switching ring. In the multi-clamping position workbench, the plurality of clamping position units are distributed along the circumferential direction of the switching ring, and both ends are detachably connected to the switching ring. When the switching ring rotates, the plurality of clamping position units can be correspondingly driven to change positions and orientations, facilitating the switching of different workpieces at the machining position and the replacement of the clamping position units or workpieces. Therefore, a plurality of clamping position units adapted to different workpieces can be provided on the switching ring, and different workpieces can be processed by using the switching function of the switching ring, saving the fixture replacement time; on the other hand, the workpieces can be processed simultaneously on both sides perpendicular to the switching ring, saving the processing time and improving the efficiency.

[0010] In a preferred technical solution of the present utility model, the rotating shaft is connected to the motor. Using the motor to drive the rotating shaft to connect the switching ring instead of manual rotation makes the positioning of the machining position more accurate and enables automatic switching of machining.

[0011] In a preferred technical solution of the present utility model, the system further includes a material transmission system. The material transmission system is arranged close to the multi-clamping position workbench. The material transmission system includes a transport vehicle, a material table, and a loading machine; the transport vehicle transports materials for the material table, the material table is arranged on one side of the multi-clamping position workbench, and the loading machine is fixed on the upper surface of the material table. The above material transmission system transports workpieces by a staff member pushing the transport vehicle or uses an intelligent transport vehicle for automatic material transportation, places the workpieces to be processed on the material table surface, and fixes the workpieces to be processed on the fixed plate through the loading machine. By automating the loading in this way, the workload of the staff is reduced.

[0012] In a preferred technical solution of the present utility model, the loading machine includes a first rotating part, a second rotating part and a loading head; the first rotating part is fixedly connected to the material table, and the second rotating part connects the first rotating part and the loading head through a support rod. In this loading machine, the first rotating part has a rotating base, which is fixed to one side of the material table and rotatably connected to one end of the support rod, so that the support rod can rotate in the horizontal direction; in addition, the second rotating part is a rotary joint, and the other end of the support rod is rotatably connected to the second rotating part, and the loading head can rotate in the vertical direction by connecting with another support rod. This design allows the loading machine to load materials flexibly, so that the material transfer system can be arranged at multiple positions close to the multi-clamping workbench, reducing the space limitation.

[0013] In a preferred technical solution of the present utility model, the material table includes a feeding table and a discharging table, and the feeding table and the discharging table are symmetrically arranged with respect to the loading machine. The above-mentioned feeding table and discharging table are arranged on both sides of the loading machine. Since the loading machine can rotate flexibly in the horizontal direction, it can pick up materials on one side of the feeding table and then load them. After the workpiece is processed, the materials are picked up and placed on the discharging table to complete the discharging, realizing fully automated processing.

[0014] The specific working process of the device is as follows: the loading machine picks up the workpiece to be processed on one side of the feeding table, and then fixes the workpiece to be processed on the fixing plate. When the multi-clamping workbench is far away from the loading machine, the positioning system can be used to move the multi-clamping workbench to a position closer to the loading machine for easy loading. After the loading of a single clamping unit is completed, the switching ring can be used to switch the remaining clamping units to the loading position to continue loading. Both sides of the switching ring can be processed simultaneously, and the driving device will move the multi-clamping workbench on the linear guide rail according to the control instruction to change the processing position, so as to process multiple areas on the workpiece. After processing, the switching ring rotates to switch other clamping units for continuous processing.

[0015] The beneficial effects of the present utility model at least include:

[0016] A multi-clamping position automatic production system for a digital machining center provided by the utility model includes a multi-clamping position workbench and a positioning mechanism. The multi-clamping position workbench is located at the positioning mechanism and is connected to the positioning mechanism. The multi-clamping position workbench includes a clamping position unit and a switching mechanism, which is detachably arranged on the switching mechanism. The switching mechanism is used to change the position of the clamping position unit in the multi-clamping position workbench. The positioning mechanism includes a sliding component and a driving device. The sliding component is located on one side of the driving device and is connected to the driving device. The sliding component is fixedly connected to the multi-clamping position workbench. This system enables the multi-clamping position workbench to have the ability to move by connecting the multi-clamping position workbench with the positioning mechanism. The positioning mechanism can accurately position the multi-clamping position workbench to the processing area, thereby avoiding processing errors caused by the position error of the clamping position unit. Moreover, the switching mechanism is detachably connected to the clamping position unit, and the switching mechanism can drive the clamping position unit to rotate to change the position of the clamping position unit, thereby facilitating the disassembly of the clamping position unit to facilitate the rapid replacement of the clamping position unit by the staff and improving the processing efficiency. Description of the Drawings

[0017] Figure 1 is a schematic plan view of the multi-clamping position automatic production system for a digital machining center provided by the present application;

[0018] Figure 2 is a left view of the multi-clamping position automatic production system for a digital machining center provided by the present application;

[0019] Figure 3 is a schematic structural view of the socket and the mounting ring provided by the present application;

[0020] Figure 4 is a schematic structural view of the material transmission system provided in Embodiment 2 of the present application.

[0021] Reference Signs:

[0022] 1. Multi-clamping position workbench; 11. Clamping position unit; 111. Fixed plate; 112. Mounting component; 1121. Mounting ring; 12. Switching mechanism; 121. Switching ring; 1211. Socket; 122. Connecting plate; 2. Positioning mechanism; 21. Sliding component; 211. Linear guide rail; 212. Moving seat; 22. Driving device; 3. Base; 4. Material transmission system; 41. Transport vehicle; 42. Material table; 421. Inlet table; 422. Outlet table; 43. Loading machine; 431. First rotating part; 432. Second rotating part; 433. Loading head. Detailed Embodiments

[0023] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0024] In the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0025] Embodiment 1

[0026] See Figures 1 to 4 As shown, the present application provides a multi-clamping position automatic production system for a digital machining center, including a multi-clamping position workbench 1 and a positioning mechanism 2. The multi-clamping position workbench 1 is located above the positioning mechanism 2 and is connected to the positioning mechanism 2. The multi-clamping position workbench 1 includes a clamping unit 11 and a switching mechanism 12. The clamping unit 11 is detachably arranged on the switching mechanism 12. The switching mechanism 12 is used to change the position of the clamping unit 11 in the multi-clamping position workbench 1. The positioning mechanism 2 includes a sliding component 21 and a driving device 22. The sliding component 21 is located on one side of the driving device 22 and is connected to the driving device 22. The sliding component 21 is fixedly connected to the multi-clamping position workbench 1.

[0027] Specifically, an installation position is provided on the switching mechanism 12. Both ends of the clamping unit 11 are detachably connected to the switching mechanism 12, and one end is inserted into the installation position of the switching mechanism 12. At the connection between the switching mechanism and the clamping unit, pins, bolts, etc. can be specifically used for connection, or a snap connection with a slot can be used. Therefore, different clamping units 11 can be set to fix different workpieces, thereby realizing the processing of multiple workpieces by one machine. During processing, the position of the clamping unit 11 can be moved through the switching mechanism 12. When the processing output end is fixed, processing can also be performed on different regions of the workpiece to achieve high-precision processing. The sliding component 21 is connected to the bottom of the multi-clamping position workbench 1. Vertical rollers and horizontal pulleys can be arranged at the bottom of the multi-clamping position workbench 1. By arranging motors on opposite sides of the multi-clamping position workbench 1 and fixing a transmission belt at the output end of the motor, the transmission belt is sleeved on the horizontal pulley, and the motor is used to tighten or loosen the transmission belt, so that the multi-clamping position workbench 1 can move bidirectionally; or an oil cylinder is connected to the multi-clamping position workbench 1, and rollers are arranged at the bottom of the multi-clamping position workbench 1. The driving rod of the oil cylinder is used to drive the multi-clamping position workbench 1 to change its position, which further facilitates processing at different positions of the workpiece.

[0028] Further, the clamping unit 11 includes a fixing plate 111 and a mounting component 112. The mounting component 112 is inserted on the switching mechanism 12, and one end of the fixing plate 111 is detachably connected to the mounting component 112. The switching mechanism 12 includes a switching ring 121 and a rotating shaft. The switching ring 121 is fixed on the sliding component 21. A connecting plate 122 is installed in the switching ring 121. The mounting component 112 is inserted on one side of the switching ring 121, and the rotating shaft is connected to the connecting plate 122. Specifically, the fixing plate 111 is used to receive and fixedly connect the workpiece. For a larger workpiece, it can be fixed by opening holes in the fixing plate 111 and using locking parts such as screws. For a smaller workpiece, a fixing groove can be opened on the fixing plate 111 for installation. The mounting component 112 is connected to one end of the fixing plate 111 and fixed with screws. The mounting component 112 has a convex part, so it is inserted on the switching ring 121. The opposite end of the fixing plate 111 is bolted to one side of another switching ring 121, thereby fixing the clamping unit 11. Further, two vertical fixing plates 111 can be arranged on two switching rings 121. One switching ring 121 is fixed, and the other switching ring 121 is fixed on the rotating shaft and moves with the multi-clamping workbench 1. Then, the mounting component 112 is fixedly installed on the outside of the vertical fixing plate 111. The two ends of the workpiece are clamped by the two vertical fixing plates 111 and the two ends of the workpiece are connected to achieve fixation, which has a higher adaptability to workpieces of different sizes. When it is necessary to switch the position of the clamping unit 11, the movement of the multi-clamping workbench 1 is used to separate the clamping unit 11 from the fixed switching ring 121. Then, after manually changing the position of the clamping unit 11, the multi-clamping workbench 1 is moved to insert into the fixed switching ring 121 to achieve position switching. When it is necessary to replace the clamping unit 11, the movement of the multi-clamping workbench 1 is used to separate the clamping unit 11 from the switching ring 121 so as to facilitate removing the other end that is connected, thereby replacing the clamping unit 11. The detachable connection design of the fixing plate 111 and the mounting component 112 is beneficial to appropriately replace the corresponding fixing plate 111 according to workpieces of different sizes, realizing modular installation.

[0029] Further, the sliding component 21 includes a linear guide rail 211 and a moving seat 212. The linear guide rail 211 is installed on the base 3, and the moving seat 212 is fixed to the bottom of the multi-clamping workbench 1 and is slidably connected to the linear guide rail 211. Specifically, two linear guide rails 211 are arranged in parallel and are perpendicularly arranged relative to the switching ring 121 on the base 3. The pulleys at the bottom of the moving seat 212 are slidably connected on the linear guide rail 211. A servo motor is arranged in the moving seat 212. The servo motor is electrically connected to the control center, and its output end drives the pulley to rotate on the linear guide rail 211, thereby driving the multi-clamping workbench 1 to move back and forth in a direction parallel to the fixing plate 111, facilitating the flexible change of the machining position of the workpiece.

[0030] Furthermore, the installation component 112 has an installation ring 1121, and the installation ring 1121 is inserted into a socket 1211 on the switching ring 121. Specifically, the installation ring 1121 passes through the socket 1211 and exposes at the other end of the switching ring 121. Therefore, the installation component 112 is inserted on the switching ring 121 through the installation ring 1121. A pin can be inserted into the installation ring 1121, and a nut is threadedly connected to the pin to fix the installation component 112, improving the installation stability.

[0031] Furthermore, a plurality of clamping units 11 are detachably connected to the switching ring 121. Specifically, in the multi-clamping workbench 1, the plurality of clamping units 11 are circumferentially distributed around the switching ring 121 and are detachably connected to both ends of the switching ring 121. When the switching ring 121 rotates, the positions and orientations of the plurality of clamping units 11 can be correspondingly changed, facilitating the switching of processing different workpieces and making the clamping units 11 in a relatively easy-to-detach position, facilitating the replacement of the clamping units 11 or workpieces. Moreover, a plurality of clamping units 11 adapted to different workpieces can be set, making full use of the switching function of the switching ring 121 to realize the conversion of processing different workpieces, saving the fixture replacement time. On the other hand, the workpieces can be processed simultaneously on both sides perpendicular to the switching ring 121, saving processing time and improving efficiency.

[0032] Furthermore, the rotating shaft is connected to the motor. Specifically, both ends of the connecting plate 122 are connected to the inside of the switching ring 121, and at the same time, the motor is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to one side of the connecting plate 122. The rotation of the switching ring 121 is automated by driving the motor, which can accurately position the processing position and reduce errors.

[0033] Embodiment 2

[0034] See Figure 1 and Figure 4 As shown in and, this embodiment provides a multi-clamping automated production system for a digital machining center, which further includes a material transmission system 4. The material transmission system 4 is arranged close to the multi-clamping workbench 1. The material transmission system 4 includes a transport vehicle 41, a material table 42, and a loading machine 43. The transport vehicle 41 transports materials for the material table 42. The material table 42 is arranged on one side of the multi-clamping workbench 1, and the loading machine 43 is fixed on the upper surface of the material table 42. In the above material transmission system 4, the material table 42 is placed close to the multi-clamping workbench 1. During loading, the operator pushes the transport vehicle 41 to transport the workpiece and places the workpiece to be processed on the tabletop of the material table 42. Then, the loading machine 43 picks up and fixes the workpiece to be processed on the fixing plate 111. Or the intelligent transport vehicle 41 is remotely controlled to automate the material transportation, realizing full automation and saving human resources.

[0035] Further, the loader 43 includes a first rotating part 431, a second rotating part 432 and a loading head 433; the first rotating part 431 is fixedly connected to the material table 42, and the second rotating part 432 connects the first rotating part 431 and the loading head 433 through a support rod. Specifically, in the loader 43, the first rotating part 431 has a rotating base, which is fixed to one side of the material table 42. The first rotating part 431 rotates on the material table 42 through this rotating base. One end of the support rod is rotatably connected to the rotating base, so that the support rod can rotate in the horizontal direction; the other end of the support rod is rotatably connected to the second rotating part 432, and the second rotating part 432 connects another support rod so that the loading head 433 can rotate in the vertical direction. This design enables the loader 43 to feed materials flexibly, so as to cope with different working conditions. Therefore, the material transmission system 4 can be arranged at multiple positions close to the multi-clamping workbench 1, reducing the limitation of space. It can be understood that setting multiple material transmission systems 4 is beneficial to reducing the loading time when the space is sufficient.

[0036] Further, the material table 42 includes a feeding table 421 and a discharging table 422, and the feeding table 421 and the discharging table 422 are symmetrically arranged with respect to the loader 43. Specifically, the feeding table 421 and the discharging table 422 are arranged on both sides of the loader 43. Since the loader 43 can rotate in the horizontal direction, it can pick up materials on one side of the feeding table 421 and then feed them. After the workpiece is processed, the multi-clamping workbench 1 is driven by a servo motor to move towards the loader 43, and is accurately positioned in the material picking area of the loader 43. Finally, the loader 43 picks up the workpiece and places it on the discharging table 422 to complete discharging, thus completing fully automated processing.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automated production system for a multi-clamping digital machining center, characterized in that: It includes a multi-clamping workbench (1) and a positioning mechanism (2); the multi-clamping workbench (1) is located above the positioning mechanism (2) and is connected to the positioning mechanism (2); The multi-clamping workbench (1) includes a clamping unit (11) and a switching mechanism (12); the clamping unit (11) is detachably arranged on the switching mechanism (12); the switching mechanism (12) is used to change the position of the clamping unit (11) in the multi-clamping workbench (1); The positioning mechanism (2) includes a sliding component (21) and a driving device (22); the sliding component (21) is located on one side of the driving device (22) and is connected to the driving device (22); the sliding component (21) is fixedly connected to the multi-clamping workbench (1).

2. The multi-clamping position automatic production system for a digital machining center according to claim 1, characterized in that: The clamping unit (11) includes a fixing plate (111) and a mounting component (112); the mounting component (112) is inserted into the switching mechanism (12), and one end of the fixing plate (111) is detachably connected to the mounting component (112); the switching mechanism (12) includes a switching ring (121) and a rotating shaft, the switching ring (121) is fixed on the sliding component (21), a connecting plate (122) is installed in the switching ring (121), the mounting component (112) is inserted into one side of the switching ring (121), and the rotating shaft is connected to the connecting plate (122).

3. The multi-clamping position automatic production system of a digital machining center according to claim 1, characterized in that: The sliding component (21) includes a linear guide rail (211) and a moving seat (212); the linear guide rail (211) is installed on a base (3); the moving seat (212) is fixed to the bottom of the multi-clamping workbench (1) and is slidably connected to the linear guide rail (211).

4. The digital machining center multi-clamping automatic production system according to claim 2, characterized in that The mounting component (112) has a mounting ring (1121), and the mounting ring (1121) is inserted into a socket (1211) on the switching ring (121).

5. The digital machining center multi-clamping automatic production system according to claim 2, wherein A number of clamping units (11) are detachably connected to the switching ring (121).

6. The digital machining center multi-clamping automated production system according to claim 1, characterized in that It further includes a material transmission system (4), the material transmission system (4) is arranged close to the multi-clamping workbench (1), and the material transmission system (4) includes a transport vehicle (41), a material table (42) and a loading machine (43); the transport vehicle (41) transports materials for the material table (42), the material table (42) is arranged on one side of the multi-clamping workbench (1), and the loading machine (43) is fixed on the upper surface of the material table (42).

7. The digital machining center multi-clamping automated production system according to claim 6, characterized in that The loading machine (43) includes a first rotating part (431), a second rotating part (432) and a loading head (433); the first rotating part (431) is fixedly connected to the material table (42), and the second rotating part (432) connects the first rotating part (431) and the loading head (433) through a support rod.

8. The digital machining center multi-clamping position automated production system according to claim 6, characterized in that The material table (42) includes a feeding table (421) and a discharging table (422), and the feeding table (421) and the discharging table (422) are symmetrically arranged with respect to the loading machine (43).

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