Automatic sealing, subpackaging and pouring device

Abstract

The utility model belongs to the technical field of powder processing, particularly relates to an automatic sealing, subpackaging and pouring device, and aims to solve the problems that powder flies, manual sealing and subpackaging are needed and the like often exist in a traditional pouring device, and the environmental cleanliness and the powder subpackaging efficiency are affected. The device comprises a slewing mechanism, a clamping mechanism, a vibrator and a split charging valve, the swing mechanism is fixed with the clamping mechanism, the clamping mechanism is used for clamping a feeding tank, the feeding tank is filled with powder to be subpackaged, the clamping mechanism is fixed and communicated with the subpackaging valve, and the subpackaging valve is connected with the receiving container in a sealed mode and used for subpackaging the powder into the receiving container; a vibrator is mounted on the clamping mechanism, and is used for vibrating and falling powder attached to the inner walls of the feeding tank and the split charging valve; and the slewing mechanism is used for driving the clamping mechanism and the split charging valve to rotate, so that the powder in the feeding tank falls down. According to the utility model, the automation degree of the whole material pouring process is high, and powder leakage and flying are effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder material processing, and in particular relates to an automatic device for sealing, sub-packaging and discharging materials. Background Art

[0002] In the process of powder handling, it is often necessary to pour powder from one container into another or multiple containers, especially in the chemical, food, and pharmaceutical industries. Strict requirements are placed on the powder filling and pouring operations. The powder needs to be sealed during the pouring process to prevent leakage and flying. However, traditional pouring devices often have problems such as flying powder and the need for manual sealing and filling, which affects environmental cleanliness and powder filling efficiency.

[0003] Based on this, the utility model proposes a sealed sub-packaging and material pouring automation device. Utility Model Content

[0004] In order to solve the above problems in the prior art, namely, the traditional material discharging device often has problems such as powder flying and manual sealing and packaging, which affects the environmental cleanliness and powder packaging efficiency, the utility model provides a sealed packaging and discharging automatic device, including a rotary mechanism, a clamping mechanism, a vibrator and a dispensing valve;

[0005] The rotary mechanism is fixed to the clamping mechanism, the clamping mechanism is used to clamp the incoming material tank, the incoming material tank contains powder to be packaged, the clamping mechanism is fixed to and communicated with the filling valve, the filling valve is sealed and connected to the material receiving container, and the filling valve is used to fill the powder into the material receiving container;

[0006] The clamping mechanism is provided with a vibrator, which is used to vibrate the powder attached to the inner wall of the incoming material tank and the filling valve to drop down;

[0007] The rotary mechanism is used to drive the clamping mechanism and the filling valve to rotate, so that the powder in the incoming material tank falls down.

[0008] In some preferred embodiments, the clamping mechanism includes a top pressing plate, a bottom pressing plate, a driving device, a guiding device and a funnel;

[0009] The top pressure plate is sealed and connected to one end of the funnel, the other end of the funnel is sealed and connected to the filling valve and fixed, the top pressure plate is fixed to the fixed end of the driving device, the telescopic end of the driving device is fixed to the bottom pressure plate, an incoming tank is placed on the bottom pressure plate, the bottom pressure plate is fixed to one end of the guide device, the other end of the guide device is arranged in the guide hole and moves along it, and the guide hole is opened on the top pressure plate.

[0010] In some preferred embodiments, the vibrator is fixed to the top pressure plate.

[0011] In some preferred embodiments, the slewing mechanism is fixed to the guide anti-slip mechanism, and the guide anti-slip mechanism is slidably connected to the bottom pressure plate.

[0012] In some preferred embodiments, the dispensing valve comprises a valve body, a rotating sleeve, a rotating drum, a rotating shaft, a rotating power device, a bearing and a quantitative groove;

[0013] The other end of the funnel is sealed and connected to the valve body and fixed, the valve body overlaps the outer circumferential surface of the drum, the drum is connected to the rotating sleeve bearing through a bearing, the rotating sleeve is coaxially fixed to the rotating shaft, the rotating shaft is coaxially fixed to the output end of the rotary power device, and the housing of the rotary power device is fixed on the valve body;

[0014] The rotating sleeve is coaxially fixed to the rotating shaft, the rotating shaft is coaxially fixed to the output end of the rotary power device, and the housing of the rotary power device is fixed to the valve body;

[0015] The outer circumferential surface of the rotating sleeve is evenly provided with quantitative grooves, and the quantitative grooves are used to receive the powder material falling down through the valve body.

[0016] In some preferred embodiments, a seal is installed between the bearing and the rotating sleeve, and the seal is used to prevent the powder from leaking during the pouring process.

[0017] In some preferred embodiments, a first locking member is installed between the valve body and the rotating drum, and the first locking member is used to ensure that the position of the rotating drum remains stable and does not slide or fall during the rotation process.

[0018] In some preferred embodiments, a second locking member is installed between the rotating sleeve and the rotating shaft, and the second locking member is used to fix the rotating sleeve to ensure that the rotating sleeve and the rotating shaft rotate synchronously when the rotating shaft rotates.

[0019] In some preferred embodiments, the outer surface of the valve body is fixed to the shell of the lifting mechanism, the lifting end of the lifting mechanism is fixed to the sealing cover, and the sealing cover is coaxially sleeved on the outer surface of the valve body and used to seal the material receiving container.

[0020] In some preferred embodiments, at least two groups of the guide devices are provided between the top pressing plate and the bottom pressing plate.

[0021] Beneficial effects of the utility model:

[0022] The utility model realizes sealed material discharging and automatic quantitative dispensing of the discharging device by adopting units such as a rotary mechanism, a clamping mechanism, a vibrator and a dispensing valve, thereby improving the environmental cleanliness and dispensing efficiency during powder material processing. At the same time, the drum and the rotating sleeve are made of highly wear-resistant and corrosion-resistant materials, which enhances the durability and stability of the device.

[0023] Good sealing: Through the design of the clamping mechanism and the sealing cover, the powder tank and the receiving container are sealed and unloaded, effectively preventing the leakage and flying of powder.

[0024] Easy to operate: The coordinated effect of the rotary mechanism, clamping mechanism and dispensing valve makes the entire unloading process highly automated and easy and quick to operate.

[0025] Precise filling: The quantitative groove and automatic control design of the filling valve can achieve precise filling and unloading of powder materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of a sealed dispensing and discharging automation device before use of the utility model;

[0028] Figure 2 This is a schematic diagram of the overall structure of the utility model after the sealed sub-packaging and discharging automatic device is used;

[0029] Figure 3 This is a first-perspective axonometric diagram of the internal structure of a sealed dispensing and unloading automation device after use of the utility model;

[0030] Figure 4 yes Figure 3 A partial enlarged view of

[0031] Figure 5 This is a second-angle axonometric diagram of the internal structure of the sealed dispensing and unloading automatic device after use of the utility model;

[0032] Figure 6 yes Figure 5 A partial enlarged view of

[0033] Figure 7 It is a structural schematic diagram of the first locking member after use of a sealed dispensing and unloading automation device of the utility model;

[0034] Figure 8 yes Figure 7 A partial enlarged view of . DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the relevant utility model are shown in the accompanying drawings.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] like Figure 1-Figure 8 As shown, see Figure 1 The utility model provides a sealed filling and discharging automatic device, comprising a rotary mechanism 1, a clamping mechanism 2, a vibrator 3 and a filling valve 4;

[0038] The rotary mechanism 1 is fixed to the clamping mechanism 2, and the clamping mechanism 2 is used to clamp the incoming material tank 5, and the incoming material tank 5 is filled with powder to be packaged. The clamping mechanism 2 is fixed to and communicated with the sub-packaging valve 4, and the sub-packaging valve 4 is sealed and connected to the material receiving container. The sub-packaging valve 4 is used to pack the powder into the material receiving container;

[0039] The clamping mechanism 2 is provided with a vibrator 3, which is used to vibrate the powder attached to the inner wall of the incoming material tank 5 and the filling valve 4 to drop down;

[0040] The rotary mechanism 1 is used to drive the clamping mechanism 2 and the filling valve 4 to rotate, so that the powder in the incoming material tank 5 falls down.

[0041] When the utility model is in use, firstly, the incoming material tank 5 filled with powder is clamped by the clamping mechanism 2, at which time the opening direction of the incoming material tank 5 faces upward, and the output end rotated by the rotary mechanism 1 rotates 180° to drive the clamping mechanism 2, the incoming material tank 5, the vibrator 3 and the filling valve 4 to rotate 180° together, so that the opening direction of the incoming material tank 5 faces downward, and the powder inside it is introduced into the filling valve 4, and the filling valve 4 fills the powder and pours it into the receiving container. The controllers of the rotary mechanism 1, the clamping mechanism 2 and the filling valve 4 are connected to the communication module, and the communication module is connected to the automatic control system. Automatic material dispensing can be realized through the above content, and since the filling valve 4 is sealed and connected to the receiving container, dust will not appear during dispensing, thereby improving the environmental cleanliness and filling efficiency during powder processing.

[0042] The rotating device 1 is a prior art, and its structure is not described in detail here.

[0043] For further explanation of the present invention, see Figure 1 and Figure 2, the clamping mechanism 2 includes a top pressing plate 21, a bottom pressing plate 22, a driving device 23, a guiding device 24 and a funnel 25;

[0044] The top pressure plate 21 is sealed and connected to one end of the funnel 25, and the other end of the funnel 25 is sealed and connected to and fixed to the filling valve 4. The top pressure plate 21 is fixed to the fixed end of the driving device 23, and the telescopic end of the driving device 23 is fixed to the bottom pressure plate 22. The incoming tank 5 is placed on the bottom pressure plate 22. The bottom pressure plate 22 is fixed to one end of the guide device 24, and the other end of the guide device 24 is arranged in the guide hole and moves along it. The guide hole is opened on the top pressure plate 21.

[0045] The driving device 23 may be any device capable of realizing lifting motion, and is preferably a cylinder in the present embodiment. Specifically, the cylinder body of the cylinder is connected to the fixed end of the driving device, and the telescopic rod of the cylinder is the telescopic end of the driving device.

[0046] When the utility model is in use, the incoming material tank 5 is placed on the bottom pressure plate 22, the opening of the incoming material tank 5 is aligned with the through hole of the top pressure plate 21, and the driving device 23, that is, the cylinder, is remotely controlled to make the telescopic rod of the cylinder contract and move, and the contraction rod of the cylinder drives the bottom pressure plate 22 to approach the top pressure plate 21 until the incoming material tank 5 is tightly abutted against the top pressure plate 21, thereby achieving the clamping of the incoming material tank 5.

[0047] For further explanation of the present invention, see Figure 1 , the vibrator 3 is fixed on the top pressure plate 21.

[0048] For further explanation of the present invention, see Figure 1 The rotating mechanism 1 is fixed to the guide anti-slip mechanism 6 , and the guide anti-slip mechanism 6 is slidably connected to the bottom pressure plate 22 .

[0049] The bottom pressure plate 22 is fixed to the guide rail, and a guide anti-slip mechanism 6 is provided inside the guide rail, which moves along the guide rail without rotating, so that the clamping mechanism 2 can be limited to rotate only with the rotary mechanism 1 and will not move on its own, thereby preventing the incoming material tank 5 from falling off.

[0050] For further explanation of the present invention, see Figure 1-Figure 6 The dispensing valve 4 includes a valve body 41, a rotating sleeve 42, a rotating drum 43, a rotating shaft 44, a rotating power device 45, a bearing 46 and a quantitative groove 47;

[0051] The other end of the funnel 25 is sealed and connected to the valve body 41 and fixed. The valve body 41 overlaps the outer circumferential surface of the drum 43. The drum 43 is connected to the rotating sleeve 42 through a bearing 46. The rotating sleeve 42 is coaxially fixed to the rotating shaft 44. The rotating shaft 44 is coaxially fixed to the output end of the rotating power device 45. The housing of the rotating power device 45 is fixed on the valve body 41.

[0052] The rotating sleeve 42 is coaxially fixed with the rotating shaft 44, the rotating shaft 44 is coaxially fixed with the output end of the rotating power device 45, and the housing of the rotating power device 45 is fixed on the valve body 41;

[0053] The outer circumferential surface of the rotating sleeve 42 is evenly provided with quantitative grooves 47 , and the quantitative grooves 47 are used to receive the powder falling through the inside of the valve body 41 .

[0054] When the incoming material tank 5 and the filling valve 4 rotate 180° with the rotary mechanism 1, the rotary power mechanism 45 is started, the rotary power mechanism 45 drives the rotating shaft 44 and the rotating sleeve 42 to rotate, and the quantitative groove 47 on the rotating sleeve 42 transfers the powder to the bottom for unloading. During the unloading process, the vibrator 3 is started to vibrate the floating material on the inner wall and break the powder bridge to ensure the smooth unloading and the accuracy of the unloading. When the amount of unloading material reaches the set value, the rotary power mechanism 45 and the vibrator 3 of the filling valve 4 are closed to stop unloading.

[0055] The output shaft of the rotary power device 45 passes through a through hole formed on the outer surface of the valve body 41 and is coaxially fixed to the rotating shaft 44 .

[0056] The rotating drum 43 and the rotating sleeve 42 are both made of highly wear-resistant and corrosion-resistant materials.

[0057] The diameter, depth and other dimensions of the quantitative groove 47 can be designed by those skilled in the art according to the amount to be packaged, so that the utility model can be adapted to more situations and has universality and applicability.

[0058] Among them, the valve body 41 includes an upper valve body, a cylindrical ring and a lower valve body which are coaxially fixed in sequence. The upper valve body is used to collect materials and falls into the cylindrical ring. The rotating sleeve 42 is arranged in the cylindrical ring. Therefore, the powder can fall into the quantitative groove 47, fall into the lower valve body through rotation, and finally fall into the material receiving container through the lower valve body.

[0059] The rotating drum 43 is provided with a through hole, the area of ​​which is larger than the quantitative groove 47 , so as to prevent the powder from falling into the quantitative groove 47 .

[0060] For further explanation of the present invention, see Figure 4A seal 7 is installed between the bearing 46 and the rotating sleeve 42, and the seal 7 is used to prevent the powder from leaking during the pouring process.

[0061] In other words, the seal 7 is an annular seal, which is fixed between the inner ring and the outer ring of the bearing 43 .

[0062] For further explanation of the present invention, see Figure 4 , Figure 7 and Figure 8 A first locking member 8 is installed between the valve body 41 and the rotating drum 43. The first locking member 8 is used to ensure that the position of the rotating drum 43 remains stable and does not slide or fall during the rotation process.

[0063] The first locking member 8 in this embodiment includes a first cylindrical ring 81 and a protrusion 82;

[0064] The first cylindrical ring 81 is sleeved on the outside of the rotary power device 45, and the outer circumferential surface of the first cylindrical ring 81 is engaged with the circular hole opened on the outer circumferential surface of the valve body 41. Two protrusions 82 are symmetrically fixed on the end surface of the first cylindrical ring 81, and the protrusions 82 are engaged with the rotating drum 43, thereby limiting the rotation of the rotating drum 43, thereby achieving locking between the valve body 41 and the rotating drum 43.

[0065] Two first locking members 8 are symmetrically arranged along the midpoint of the rotating sleeve 42 .

[0066] For further explanation of the present invention, see Figure 6 A second locking member 9 is installed between the rotating sleeve 42 and the rotating shaft 44. The second locking member 9 is used to fix the rotating sleeve 42 to ensure that the rotating sleeve 42 and the rotating shaft 44 rotate synchronously when the rotating shaft 44 rotates.

[0067] Among them, a second locking member 9 is installed between the rotating sleeve 42 and the rotating shaft 44. The specific method thereof can refer to the mortise and tenon structure, which is the prior art and will not be described in detail here.

[0068] For further explanation of the present invention, see Figure 2 The outer surface of the valve body 41 is fixed to the shell of the lifting mechanism 10, and the lifting end of the lifting mechanism 10 is fixed to the sealing cover 11. The sealing cover 11 is coaxially sleeved on the outer surface of the valve body 41 and is used to seal the material receiving container.

[0069] Specifically, the outer surface of the discharge valve body is fixed to the shell of the lifting mechanism 10 .

[0070] The lifting mechanism 10 is located outside the valve body 41 and controls the lifting and lowering of the sealing cover 11 by mechanical drive or pneumatic drive.

[0071] The sealing cover 11 is located below the lifting mechanism 10. When the lifting mechanism 10 descends, the sealing cover 11 fits tightly above the material receiving container to achieve sealing of the material receiving container.

[0072] When the utility model is in use, before the rotating power mechanism 45 is started, the lifting mechanism 10 is first started to drive the sealing cover 11 to descend and seal the receiving container. After the powder in the receiving container is left to stand for a period of time and no longer flies, the lifting mechanism 10 lifts the sealing cover 11 to complete the current powder packaging.

[0073] For further explanation of the present invention, see Figure 1 At least two groups of the guide devices 24 are provided between the top pressing plate 21 and the bottom pressing plate 22 .

[0074] In actual use, the incoming material tank 5 to be packaged is placed on the clamping mechanism 2, and the sealing clamping of the incoming material tank 5 is achieved through the driving device 23 and the guiding device 24. Then, the rotary mechanism 1 rotates the incoming material tank 180 degrees, so that the powder material descends to the filling valve 4, ready for filling and unloading.

[0075] Before unloading, the lifting mechanism 10 lowers the sealing cover 11 to form a closed space with the receiving container below to prevent the powder from flying when unloading. Then the rotating power device 45 is clicked to start, driving the rotating shaft 44 and the rotating sleeve 42 to rotate, and the quantitative groove 47 on the rotating sleeve 42 transfers the powder to the bottom for unloading. During the unloading process, the vibrator 3 is started to vibrate the floating material on the inner wall and break the powder bridge to ensure the smoothness of unloading and the accuracy of packaging. When the amount of material unloaded reaches the set value, the dispensing valve 4 and the vibrator 3 are closed to stop unloading. After the powder in the receiving container is left to stand for a period of time and no longer flies, the lifting mechanism 10 lifts the sealing cover 11 and completes the powder packaging.

[0076] In practical applications, the utility model can be appropriately adjusted and optimized according to the specific properties of the powder and the operating requirements. For example, the vibration frequency and amplitude of the vibrator can be adjusted according to the viscosity and particle size of the powder; the size of the groove of the filling valve and the control accuracy of the lifting mechanism can be adjusted according to the requirements of the filling accuracy.

[0077] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0078] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0079] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0080] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A sealed filling and unloading automatic device, characterized in that: It comprises a rotating mechanism (1), a clamping mechanism (2), a vibrator (3) and a dispensing valve (4); The rotary mechanism (1) is fixed to the clamping mechanism (2), the clamping mechanism (2) is used to clamp the incoming material tank (5), the incoming material tank (5) is filled with powder to be packaged, the clamping mechanism (2) is fixed to and communicated with the filling valve (4), the filling valve (4) is sealed and connected to the material receiving container, and the filling valve (4) is used to fill the powder into the material receiving container; The clamping mechanism (2) is provided with a vibrator (3), and the vibrator (3) is used to vibrate the powder material attached to the inner wall of the incoming material tank (5) and the filling valve (4) to drop; The rotary mechanism (1) is used to drive the clamping mechanism (2) and the filling valve (4) to rotate, so that the powder in the incoming material tank (5) falls down.

2. The sealed filling and discharging automatic device according to claim 1 is characterized in that: The clamping mechanism (2) comprises a top pressing plate (21), a bottom pressing plate (22), a driving device (23), a guiding device (24) and a funnel (25); The top pressure plate (21) is sealed and connected to one end of the funnel (25), and the other end of the funnel (25) is sealed and connected to and fixed to the filling valve (4). The top pressure plate (21) is fixed to the fixed end of the driving device (23), and the telescopic end of the driving device (23) is fixed to the bottom pressure plate (22). A material tank (5) is placed on the bottom pressure plate (22). The bottom pressure plate (22) is fixed to one end of the guide device (24), and the other end of the guide device (24) is arranged in a guide hole and moves along the guide hole. The guide hole is opened on the top pressure plate (21).

3. The sealed filling and discharging automatic device according to claim 2 is characterized in that: The vibrator (3) is fixed on the top pressure plate (21).

4. The sealed filling and discharging automatic device according to claim 3 is characterized in that: The slewing mechanism (1) is fixed to the guide anti-slip mechanism (6), and the guide anti-slip mechanism (6) is slidably connected to the bottom pressure plate (22).

5. The sealed filling and discharging automatic device according to claim 2 is characterized in that: The dispensing valve (4) comprises a valve body (41), a rotating sleeve (42), a rotating drum (43), a rotating shaft (44), a rotating power device (45), a bearing (46) and a quantitative groove (47); The other end of the funnel (25) is sealed and connected to the valve body (41) and fixed thereto; the valve body (41) overlaps the outer circumferential surface of the rotating drum (43); the rotating drum (43) is connected to the bearing of the rotating sleeve (42) via a bearing (46); the rotating sleeve (42) is coaxially fixed to the rotating shaft (44); the rotating shaft (44) is coaxially fixed to the output end of the rotating power device (45); and the housing of the rotating power device (45) is fixed on the valve body (41); The outer circumferential surface of the rotating sleeve (42) is evenly provided with quantitative grooves (47), and the quantitative grooves (47) are used to receive the powder material falling through the inside of the valve body (41).

6. The sealed filling and discharging automatic device according to claim 5, characterized in that: A sealing member (7) is installed between the bearing (46) and the rotating sleeve (42), and the sealing member (7) is used to prevent the powder from leaking during the pouring process.

7. The sealed filling and discharging automatic device according to claim 5, characterized in that: A first locking member (8) is installed between the valve body (41) and the rotating drum (43), and the first locking member (8) is used to ensure that the position of the rotating drum (43) remains stable and does not slide or fall during the rotation process.

8. The sealed filling and discharging automatic device according to claim 5, characterized in that: A second locking member (9) is installed between the rotating sleeve (42) and the rotating shaft (44), and the second locking member (9) is used to fix the rotating sleeve (42) to ensure that when the rotating shaft (44) rotates, the rotating sleeve (42) and the rotating shaft (44) keep rotating synchronously.

9. The sealed filling and discharging automatic device according to claim 5, characterized in that: The outer surface of the valve body (41) is fixed to the shell of the lifting mechanism (10), and the lifting end of the lifting mechanism (10) is fixed to the sealing cover (11). The sealing cover (11) is coaxially sleeved on the outer surface of the valve body (41) and is used to seal the material receiving container.

10. The sealed filling and discharging automatic device according to claim 2, characterized in that: At least two groups of the guide devices (24) are arranged between the top pressing plate (21) and the bottom pressing plate (22).

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