Stamping progressive die with deviation preventing mechanism

Abstract

The utility model relates to the field of progressive dies, and discloses a stamping progressive die with an anti-deviation mechanism, which comprises a bottom plate, an operation table is fixed at the top of the bottom plate, a first module is fixed at one end of the top of the operation table, support plates are fixed on two symmetrical sides of the other end of the top of the operation table, and the inner side walls of the two support plates are rotatably connected with the same conveying belt. A stop block is fixed to the top of the conveying belt, a rotating mechanism used for rotating the conveying belt is arranged at the top of the operation table, connecting plates are arranged on the inner side walls of the two supporting plates correspondingly, moving mechanisms used for moving the two connecting plates are arranged on the side walls of the two supporting plates correspondingly, and rectangular frames are arranged on the inner side walls of the two connecting plates correspondingly. And a plurality of rollers are rotationally connected to the inner side walls of the two rectangular frames at equal intervals in a linear manner. According to the utility model, the position deviation of the stamping material in the moving process is avoided, unnecessary waste products are prevented from being generated, the production cost is reduced, waste chips do not need to be manually cleaned after the machine is stopped, the time is saved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of progressive dies, in particular to a stamping progressive die with an anti-deviation mechanism. Background Art

[0002] A progressive die is a die used for metal stamping, usually in large-scale production. It gradually processes the material into the required shape and size on a stamping machine through a series of step-by-step stamping processes. With the rapid development of modern manufacturing, stamping forming technology has been widely used in the field of metal processing due to its high efficiency, high precision and low cost, especially in the automotive, electronics and home appliance industries. As a commonly used die type, the stamping progressive die can complete multiple processes in one feeding process, greatly improving production efficiency. During the production process, the offset and positioning errors of the material during the operation of the die often cause the size of the finished product to not meet the requirements, affecting the quality and consistency of the product. Therefore, a stamping progressive die with an anti-deflection mechanism is needed.

[0003] Traditional stamping progressive dies usually do not have anti-deflection mechanisms during use, which causes the positioning of the material to shift in multiple processes, resulting in the size and shape of the parts not meeting the design requirements, causing unnecessary waste and increasing production costs. Moreover, during the stamping process, a large amount of waste chips are usually generated, and the machine needs to be stopped regularly and then manually cleaned. This operation method not only increases the workload of workers, but also takes a lot of time and reduces work efficiency. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a stamping progressive die with an anti-deviation mechanism.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A stamping progressive die with an anti-deviation mechanism comprises a bottom plate, an operating table is fixed on the top of the bottom plate, a first die set is fixed at one end of the top of the operating table, support plates are fixed on both sides symmetrically of the other end of the top of the operating table, the inner side walls of the two support plates are rotatably connected to the same conveyor belt, a stopper is fixed on the top of the conveyor belt, a rotating mechanism for rotating the conveyor belt is provided on the top of the operating table, the inner side walls of the two support plates are provided with connecting plates, and the two connecting plates are located above the conveyor belt, the side walls of the two support plates are respectively provided with a moving mechanism for moving the two connecting plates, the inner side walls of the two connecting plates are respectively provided with a rectangular frame, the inner side walls of the two rectangular frames are equidistantly linearly rotated and connected to a plurality of rollers, and the side walls of the two connecting plates are respectively provided with a mechanism for squeezing two rectangular frames. The extrusion mechanism of the rectangular frame is provided, and cleaning mechanisms are provided symmetrically on both sides of one end of the top of the operating table. The stamping material is placed on the top of the conveyor belt, and the two connecting plates are driven close to each other by two moving mechanisms, so that the two connecting plates squeeze the two ends of the material respectively. The two rectangular frames are squeezed respectively by cooperating with four extrusion mechanisms, so that multiple rollers and the top of the material fit tightly. At this time, the top and both sides of the stamping material are in an extruded state, which avoids position displacement of the stamping material during movement, prevents unnecessary waste, and reduces production costs. During processing, the waste chips that fall on the top of the operating table are cleaned by the rotating mechanism in cooperation with the two cleaning mechanisms. There is no need to stop the machine and then manually clean the waste chips, which saves time and improves work efficiency.

[0007] As a further solution of the present invention, the rotating mechanism includes two rotating shafts, which are respectively sleeved on the two ends of the conveyor belt, one end of the two rotating shafts is rotatably connected to one of the support plates, and the other end of the two rotating shafts is rotatably connected to the other support plate, a motor is fixed to the side wall of one of the support plates, and the output shaft of the motor is fixed to one of the rotating shafts, and the two ends of the other rotating shaft respectively pass through the outer side walls of the two support plates, and the two ends of the other rotating shaft are sleeved with a first bevel gear, the driving motor drives one of the rotating shafts to rotate, and cooperates with the other rotating shaft to make the conveyor belt rotate, and cooperates with the stop block to push the stamping material gradually move toward the direction close to the first module.

[0008] As a further solution of the present invention, the moving mechanism includes a threaded rod, which is rotatably connected to the outer side wall of one of the connecting plates, and one end of the threaded rod passes through the outer side wall of one of the support plates, one of the outer side walls of the support plates is provided with a threaded hole, and the threaded hole and the threaded rod are adapted, and guide rods are fixed at both ends of the outer side wall of one of the connecting plates, and one end of the two guide rods passes through the outer side wall of one of the support plates. Rotating the two threaded rods pushes the two connecting plates closer to each other, so that the two ends of the stamping material can be squeezed.

[0009] As a further solution of the present invention, the extrusion mechanism includes two sliders, wherein the inner side walls of one of the connecting plates are symmetrically provided with sliding grooves at both ends, and the two sliders are slidably arranged on the inner side walls of the two sliding grooves, and a second sliding rod is provided inside the two sliding grooves, and the two second sliding rods respectively pass through the tops of the two sliders, and the side walls of the two second sliding rods are respectively provided with springs, one end of the two springs is fixed to the two sliders, and the other end of the two springs is fixed to one of the connecting plates. The four sliders are squeezed respectively by the four springs, and then the two rectangular frames and multiple rollers can be driven to move downward along the side walls of the connecting plate to squeeze the two sides of the top of the stamping material.

[0010] As a further solution of the present invention, the cleaning mechanism includes two support plates, both of which are fixed to one side of the top of the operating table, the inner side walls of the two support plates are rotatably connected to the same reciprocating screw, and one end of the reciprocating screw passes through the outer side wall of one of the support plates, one end of the reciprocating screw is sleeved with a second bevel gear, and the second bevel gear is meshed with one of the first bevel gears, the side wall of the reciprocating screw is sleeved with a screw sleeve, and the screw sleeve is adapted to the reciprocating screw, the side wall of the screw sleeve is penetrated by a first slide rod, and the two ends of the first slide rod are respectively fixed to the two support plates A brush is fixed on the inner side wall of the screw sleeve, and a guide plate is fixed on the side wall of the operating table at one end close to the first module. During the rotation of the conveyor belt, the other rotating shaft is in a rotating state at the same time, thereby driving the two first bevel gears to rotate, and cooperating with the two second bevel gears to drive the two reciprocating screws to rotate respectively. The two reciprocating screws rotate, and cooperating with the two first sliding rods to drive the two screw sleeves to move left and right along the direction of the first module, thereby driving the two brushes to move left and right along the two sides of the first module respectively, and cooperating with the guide plate, the waste chips generated during stamping can be collected and processed.

[0011] As a further solution of the present invention, a top plate is provided on the top of the operating table, and hydraulic push rods are fixed at the four corners of the top of the bottom plate. The output ends of the four hydraulic push rods are fixed to the top plate, and a second module is fixed to the bottom of the top plate, and the second module is located directly above the first module. The four hydraulic push rods are driven to drive the top plate and the second module to descend. When the second module contacts the stamping material, stamping work can be carried out.

[0012] The beneficial effects of the utility model are:

[0013] 1. During use of this device, the stamping material is placed on the top of the conveyor belt, and the two connecting plates are driven close to each other by two moving mechanisms, so that the two connecting plates squeeze the two ends of the material respectively. By coordinating the four squeezing mechanisms to squeeze the two rectangular frames respectively, multiple rollers and the top of the material are tightly fitted. At this time, the top and both sides of the stamping material are in an extruded state, avoiding position deviation during the movement, preventing unnecessary waste, and reducing production costs.

[0014] 2. During processing, the conveyor belt is driven to rotate by the rotating mechanism to transport the stamping materials. The two cleaning mechanisms are used to clean the waste chips that fall on the top of the operating table during processing. There is no need to stop the machine and then clean it manually, which saves time and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a stamping progressive die with an anti-deflection mechanism proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the top of a base plate of a stamping progressive die with an anti-deflection mechanism proposed in the present invention;

[0017] Figure 3 for Figure 2 A magnified schematic diagram;

[0018] Figure 4 This is an exploded schematic diagram of a rotating shaft and a conveyor belt of a stamping progressive die with an anti-deviation mechanism proposed by the utility model;

[0019] Figure 5 This is an exploded schematic diagram of a connecting plate, a rectangular frame and a roller of a stamping progressive die with an anti-deflection mechanism proposed in the utility model;

[0020] Figure 6 for Figure 5 Enlarged schematic diagram at point B;

[0021] Figure 7 This is a schematic diagram of a cleaning mechanism of a stamping progressive die with an anti-deflection mechanism proposed by the present invention;

[0022] Figure 8 This is a schematic diagram of the bottom of a top plate of a stamping progressive die with an anti-deflection mechanism proposed by the utility model.

[0023] In the figure: 1. Bottom plate; 2. Top plate; 3. Hydraulic push rod; 4. Operating table; 5. Guide plate; 6. Connecting plate; 7. Threaded rod; 8. Guide rod; 9. Rectangular frame; 10. First module; 11. Support plate; 12. First slide bar; 13. Reciprocating screw rod; 14. Screw rod sleeve; 15. Support plate; 16. Motor; 17. First bevel gear; 18. Second bevel gear; 19. Rotating shaft; 20. Conveyor belt; 21. Stop block; 22. Slide groove; 23. Second slide bar; 24. Slider; 25. Spring; 26. Brush; 27. Second module; 28. Roller. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figures 1-8 , a stamping progressive die with an anti-deviation mechanism, including a base plate 1, an operating table 4 is fixed on the top of the base plate 1, a first die set 10 is fixed at one end of the top of the operating table 4, support plates 15 are fixed on both sides of the other end of the top of the operating table 4 symmetrically, the inner side walls of the two support plates 15 are rotatably connected to the same conveyor belt 20, a stopper 21 is fixed on the top of the conveyor belt 20, a rotating mechanism for rotating the conveyor belt 20 is provided on the top of the operating table 4, the inner side walls of the two support plates 15 are provided with connecting plates 6, and the two connecting plates 6 are located above the conveyor belt 20, the side walls of the two support plates 15 are respectively provided with a moving mechanism for moving the two connecting plates 6, the inner side walls of the two connecting plates 6 are respectively provided with a rectangular frame 9, the inner walls of the two rectangular frames 9 are equidistantly linearly rotated and connected to a plurality of rollers 28, and the side walls of the two connecting plates 6 are respectively provided with a mechanism for extruding The extrusion mechanism of the two rectangular frames 9 and the cleaning mechanisms are symmetrically provided on both sides of one end of the top of the operating table 4. The stamping material is placed on the top of the conveyor belt 20, and the two connecting plates 6 are driven close to each other by two moving mechanisms, so that the two connecting plates 6 respectively squeeze the two ends of the material. By cooperating with the four extrusion mechanisms, the two rectangular frames 9 are squeezed respectively, so that the multiple rollers 28 and the top of the material are tightly fitted. At this time, the top and both sides of the stamping material are in an extruded state, avoiding position displacement of the stamping material during the movement, preventing unnecessary waste and reducing production costs. During processing, the waste chips fallen on the top of the operating table 4 are cleaned by the rotating mechanism in cooperation with the two cleaning mechanisms. There is no need to stop the machine and then manually clean the waste chips, which saves time and improves work efficiency.

[0026] Reference Figure 2 and Figure 4In a preferred embodiment, the rotating mechanism includes two rotating shafts 19, which are respectively sleeved on both ends of the conveyor belt 20, one end of the two rotating shafts 19 is rotatably connected to one of the support plates 15, and the other ends of the two rotating shafts 19 are rotatably connected to the other support plate 15. A motor 16 is fixed to the side wall of one of the support plates 15, and the output shaft of the motor 16 is fixed to one of the rotating shafts 19, and the two ends of the other rotating shaft 19 respectively pass through the outer side walls of the two support plates 15, and the two ends of the other rotating shaft 19 are sleeved with a first bevel gear 17. The driving motor 16 drives one of the rotating shafts 19 to rotate, and cooperates with the other rotating shaft 19 to rotate the conveyor belt 20, and cooperates with the stop block 21 to push the stamping material gradually toward the direction close to the first die group 10.

[0027] Reference Figure 2 and Figure 5 In a preferred embodiment, the moving mechanism includes a threaded rod 7, which is rotatably connected to the outer wall of one of the connecting plates 6, and one end of the threaded rod 7 passes through the outer wall of one of the support plates 15. A threaded hole is opened on the outer wall of one of the support plates 15, and the threaded hole and the threaded rod 7 are adapted. Guide rods 8 are fixed at both ends of the outer wall of one of the connecting plates 6, and one end of the two guide rods 8 passes through the outer wall of one of the support plates 15. Rotating the two threaded rods 7 pushes the two connecting plates 6 closer to each other, so that the two ends of the stamping material can be squeezed.

[0028] Reference Figure 5 and Figure 6 In a preferred embodiment, the extrusion mechanism includes two sliders 24, wherein the inner side walls of one connecting plate 6 are symmetrically provided with slide grooves 22 at both ends, and the two sliders 24 are slidably arranged on the inner side walls of the two slide grooves 22, and a second slide rod 23 is provided inside the two slide grooves 22, and the two second slide rods 23 respectively pass through the top of the two sliders 24, and the side walls of the two second slide rods 23 are respectively provided with springs 25, one end of the two springs 25 is fixed to the two sliders 24, and the other end of the two springs 25 is fixed to one of the connecting plates 6. The four sliders 24 are squeezed respectively by the four springs 25, and then the two rectangular frames 9 and multiple rollers 28 can be driven to move downward along the side walls of the connecting plate 6 to squeeze the two sides of the top of the stamping material.

[0029] Reference Figure 2 、 Figure 3 and Figure 7In a preferred embodiment, the cleaning mechanism includes two support plates 11, both support plates 11 are fixed to one side of the top of the operating table 4, the inner side walls of the two support plates 11 are rotatably connected to the same reciprocating screw 13, and one end of the reciprocating screw 13 passes through the outer side wall of one of the support plates 11, one end of the reciprocating screw 13 is sleeved with a second bevel gear 18, and the second bevel gear 18 is meshed with one of the first bevel gears 17, the side wall of the reciprocating screw 13 is sleeved with a screw sleeve 14, and the screw sleeve 14 is adapted to the reciprocating screw 13, the side wall of the screw sleeve 14 is penetrated by a first slide rod 12, and the two ends of the first slide rod 12 are respectively fixed to the two support plates 11, the screw A brush 26 is fixed to the inner wall of the rod slide sleeve 14, and a material guide plate 5 is fixed obliquely to the side wall of one end of the operating table 4 close to the first module 10. During the rotation of the conveyor belt 20, the other rotating shaft 19 is in a rotating state at the same time, thereby driving the two first bevel gears 17 to rotate, and cooperating with the two second bevel gears 18 to drive the two reciprocating screws 13 to rotate respectively. The two reciprocating screws 13 rotate, and cooperating with the two first slides 12 to drive the two screw slide sleeves 14 to move left and right along the direction of the first module 10, thereby driving the two brushes 26 to move left and right along the two sides of the first module 10 respectively, and cooperating with the material guide plate 5, the waste chips generated during stamping can be collected and processed.

[0030] Reference Figure 1 and Figure 8 In a preferred embodiment, a top plate 2 is provided on the top of the operating table 4, and hydraulic push rods 3 are fixed at the four corners of the top of the bottom plate 1. The output ends of the four hydraulic push rods 3 are fixed to the top plate 2, and a second module 27 is fixed to the bottom of the top plate 2. The second module 27 is located directly above the first module 10. The four hydraulic push rods 3 are driven to drive the top plate 2 and the second module 27 to descend. When the second module 27 contacts the stamping material, the stamping work can be carried out.

[0031] The working principle of this embodiment: During the use of this device, a collection container is placed at the bottom of the guide plate 5 in advance, and the material to be stamped is placed on the top of the conveyor belt 20, and the two threaded rods 7 are rotated to push the two connecting plates 6 closer to each other, so as to squeeze the two ends of the stamping material. The four second sliding rods 23, the slider 24 and the spring 25 respectively drive the two rectangular frames 9 to move downward along the side wall of the connecting plate 6, and then drive multiple rollers 28 to move downward to squeeze the top and both sides of the stamping material, so that the top and both sides of the stamping material are in an extruded state, preventing the material position from shifting, avoiding unnecessary waste, and reducing production costs. When moving, the power switch of the motor 16 is turned on, and the driving motor 16 drives one of the rotating shafts 19 to rotate, and cooperates with the other rotating shaft 19 to make the conveyor belt 20 rotate, and cooperates with the blocking The block 21 pushes the stamping material to gradually move toward the first die group 10. When the material moves to the top of the first die group 10, the four hydraulic push rods 3 are driven to drive the top plate 2 and the second die group 27 to descend for stamping. Since the conveyor belt 20 is rotating, the other rotating shaft 19 is in a rotating state at the same time, thereby driving the two first bevel gears 17 to rotate, and cooperating with the two second bevel gears 18 to drive the two reciprocating screws 13 to rotate respectively. The two reciprocating screws 13 rotate, and cooperating with the two first slide rods 12 to drive the two screw sleeves 14 to move left and right along the direction of the first die group 10, thereby driving the two brushes 26 to move left and right along the two sides of the first die group 10 respectively. Cooperating with the material guide plate 5, the waste chips generated during stamping can be scraped into the collection container, without the need for manual cleaning, saving time and improving work efficiency.

[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stamping progressive die with an anti-deflection mechanism, comprising a base plate (1), characterized in that: An operating table (4) is fixed on the top of the bottom plate (1), a first module (10) is fixed on one end of the top of the operating table (4), support plates (15) are fixed on both sides of the other end of the top of the operating table (4), the inner side walls of the two support plates (15) are rotatably connected to the same conveyor belt (20), a stopper (21) is fixed on the top of the conveyor belt (20), a rotating mechanism for rotating the conveyor belt (20) is provided on the top of the operating table (4), and the inner side walls of the two support plates (15) are both provided with connecting plates (6) , and the two connecting plates (6) are both located above the conveyor belt (20), the side walls of the two support plates (15) are respectively provided with a moving mechanism for moving the two connecting plates (6), the inner side walls of the two connecting plates (6) are both provided with a rectangular frame (9), the inner side walls of the two rectangular frames (9) are evenly spaced and linearly rotated with multiple rollers (28), the side walls of the two connecting plates (6) are respectively provided with an extrusion mechanism for extruding the two rectangular frames (9), and cleaning mechanisms are symmetrically provided on both sides of one end of the top of the operating table (4).

2. The stamping progressive die with an anti-deflection mechanism according to claim 1, characterized in that: The rotating mechanism comprises two rotating shafts (19), the two rotating shafts (19) are respectively sleeved on the two ends of the conveyor belt (20), one end of the two rotating shafts (19) is rotatably connected to one of the support plates (15), and the other end of the two rotating shafts (19) is rotatably connected to the other support plate (15), a motor (16) is fixed to the side wall of one of the support plates (15), and the output shaft of the motor (16) is fixed to one of the rotating shafts (19), and the two ends of the other rotating shaft (19) respectively penetrate the outer side walls of the two support plates (15), and the two ends of the other rotating shaft (19) are sleeved with the first bevel gear (17).

3. The stamping progressive die with an anti-deflection mechanism according to claim 1, characterized in that: The moving mechanism comprises a threaded rod (7), the threaded rod (7) being rotatably connected to the outer wall of one of the connecting plates (6), and one end of the threaded rod (7) passing through the outer wall of one of the support plates (15), a threaded hole being provided on the outer wall of one of the support plates (15), and the threaded hole and the threaded rod (7) being adapted to each other, guide rods (8) being fixed at both ends of the outer wall of one of the connecting plates (6), and one end of each of the two guide rods (8) passing through the outer wall of one of the support plates (15).

4. The stamping progressive die with an anti-deflection mechanism according to claim 1, characterized in that: The extrusion mechanism includes two sliders (24), wherein the inner side wall of one of the connecting plates (6) is symmetrically provided with slide grooves (22) at both ends, and the two sliders (24) are respectively slidably arranged on the inner side walls of the two slide grooves (22), and the two slide grooves (22) are each provided with a second slide rod (23), and the two second slide rods (23) respectively pass through the top of the two sliders (24), and the side walls of the two second slide rods (23) are each sleeved with a spring (25), one end of the two springs (25) is respectively fixed to the two sliders (24), and the other end of the two springs (25) is fixed to one of the connecting plates (6).

5. The stamping progressive die with an anti-deflection mechanism according to claim 2, characterized in that: The cleaning mechanism comprises two support plates (11), both of which are fixed to one side of the top of the operating table (4), the inner side walls of the two support plates (11) are rotatably connected to the same reciprocating screw (13), and one end of the reciprocating screw (13) passes through the outer side wall of one of the support plates (11), and one end of the reciprocating screw (13) is sleeved with a second bevel gear (18), and the second bevel gear (18) is meshed with one of the first bevel gears (17). The side wall of the reciprocating screw (13) is provided with a screw sleeve (14), and the screw sleeve (14) and the reciprocating screw (13) are adapted, the side wall of the screw sleeve (14) is penetrated by a first slide bar (12), and the two ends of the first slide bar (12) are respectively fixed to two support plates (11), a brush (26) is fixed to the inner side wall of the screw sleeve (14), and a material guide plate (5) is fixed obliquely on the side wall of one end of the operating table (4) close to the first module (10).

6. The stamping progressive die with an anti-deflection mechanism according to claim 1, characterized in that: A top plate (2) is provided on the top of the operating table (4), hydraulic push rods (3) are fixed at the four corners of the top of the bottom plate (1), the output ends of the four hydraulic push rods (3) are fixed to the top plate (2), a second module (27) is fixed at the bottom of the top plate (2), and the second module (27) is located directly above the first module (10).

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