Stacking mechanism of paperboard covering machine

Abstract

The utility model relates to a stacking mechanism of a paperboard covering machine, and belongs to the technical field of paper product manufacturing. Comprising a base supported on the ground, the upper surface of the base is provided with a horizontally-arranged ground guide rail and a moving trolley capable of moving in the length direction of the ground guide rail, and the moving trolley is provided with a first driving mechanism for driving the moving trolley to reciprocate in the length direction of the ground guide rail; a vertical supporting stand column is installed at the right end of the moving trolley, a vertical sliding rail is arranged on the outer wall of the supporting stand column in the length direction of the supporting stand column, the paperboard conveying device further comprises a horizontal cross beam which is horizontally arranged, a paperboard bracket is installed at the front end of the horizontal cross beam, and a lifting driving mechanism for driving the horizontal cross beam to ascend and descend is installed at the top of the supporting stand column. The paper feeding lifting device has the advantages that the paper pile loading time of the paper feeding lifting device is shortened, the paper pile loading efficiency is improved, it is guaranteed that the paper feeding lifting device continuously supplies materials to the covering machine as much as possible, and the shutdown time of the covering machine is shortened.

Description

Technical Field

[0001] The utility model relates to a stacking mechanism of a cardboard laminating machine, belonging to the technical field of paper product production. Background Art

[0002] The cardboard laminating machine is also called a paper mounting machine, which belongs to the field of paper making machinery. It is composed of a paper feeding mechanism, a paper mounting mechanism and a paper pressing mechanism.

[0003] After searching, the patent application with patent number 201820011171.8 discloses a high-speed fully automatic laminating machine, the key points of its technical solution are that it includes a face paper feeding device, a face paper conveying device, a bottom paper conveying device, a glue supplying device, a pressurizing device and a shaping device, the face paper feeding device conveys face paper to the face paper conveying device, the bottom paper conveying device and the glue supplying device are fixedly arranged below the face paper conveying device, the face paper conveying device and the bottom paper conveying device respectively feed the face paper and the bottom paper into the pressurizing device, the bottom paper conveying device includes a bottom paper placing rack, the bottom paper placing rack includes a first conveyor belt and a front baffle, a gap is left between the bottom end of the front baffle and the first conveyor belt, the gap can and can only allow one bottom paper to pass through, an upper rack is provided on the side of the bottom paper placing rack away from the glue supplying device, the top height of the upper rack is higher than the upper surface height of the first conveyor belt, so that the pressure on the bottom sheet by the bottom paper above it is reduced, thereby achieving the purpose of reducing the difficulty of separating the upper surface of the bottom bottom paper from other bottom papers.

[0004] Although the above patent can realize the laminating machine feeding function, the current technical considerations are not comprehensive and have the following disadvantages: when the paper pile on the paper lifting device is fed, the laminating machine needs to be stopped and the paper pile to be processed needs to be re-stacked on the paper lifting device. The manual stacking speed is slow, which obviously affects the work efficiency.

[0005] In order to solve one of the above problems, a stacking mechanism of a cardboard laminating machine is urgently needed. Utility Model Content

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: how to realize the pre-stacking of paper piles on the cardboard bracket and transfer the paper piles on the cardboard bracket as a whole to the paper feeding lifting device, shorten the time for the paper feeding lifting device to load the paper piles, and improve the loading efficiency of the paper piles. For this purpose, a stacking mechanism of a cardboard laminating machine is provided.

[0007] The stacking mechanism of the cardboard laminating machine described in the utility model comprises a base supported on the ground, the upper surface of the base has a horizontally arranged ground guide rail and a movable trolley movable along the length direction of the ground guide rail, characterized in that: the movable trolley is equipped with a first driving mechanism that drives the movable trolley to reciprocate along the length direction of the ground guide rail, the right end of the movable trolley is equipped with a vertical supporting column, the outer wall of the supporting column is equipped with a vertical slide rail along its length direction, and also comprises a horizontally arranged horizontal beam, the tail end of the horizontal beam is equipped with a tail end slide seat that slides with the vertical slide rail, the front end of the horizontal beam is equipped with a cardboard bracket, the top of the supporting column is equipped with a lifting driving mechanism for driving the horizontal beam to rise and fall, the cardboard bracket comprises a back plate connected to the horizontal beam, and the bottom of the back plate is provided with a plurality of bottom support plates A arranged at intervals, and the bottom support plates A are long strip plate-shaped structures.

[0008] A paper feeding lifting device is provided on the feeding side of the laminating machine, and the paper feeding lifting device is used in conjunction with the cardboard feeding and transferring mechanism of the laminating machine. The present application can pre-stack a paper pile on the cardboard bracket, and can use a first driving mechanism to drive the cardboard bracket close to the paper feeding lifting device, and control the lifting and lowering of the cardboard bracket through the lifting driving mechanism, so that the paper pile on the cardboard bracket is transferred as a whole to the paper feeding lifting device, thereby shortening the time for the paper feeding lifting device to load the paper pile, improving the loading efficiency of the paper pile, ensuring as much as possible that the paper feeding lifting device continuously feeds the laminating machine, and reducing the downtime of the laminating machine.

[0009] The specific operation process is as follows: first use the first drive mechanism to drive the mobile trolley to move to the left side of the base, and then stack the paper on the cardboard bracket. When the paper stacking is completed and the paper on the paper feeding lifting device is used up, the paper feeding lifting device is lowered to a low position, and then the first drive mechanism is used to control the cardboard bracket to approach the paper feeding lifting device, so that the bottom plate A is transferred to the top of the bottom plate B, and the lifting drive mechanism is controlled to extend to lower the height of the bottom plate A, so that the bottom plate A passes through the avoidance slot, and the paper on the cardboard bracket is transferred to the bottom plate B, and then the cardboard bracket is controlled to reset for the next round of stacking.

[0010] Preferably, the first driving mechanism comprises a reduction motor fixed on the mobile trolley, a driving gear is installed on the power output shaft of the reduction motor, and a rack meshing with the driving gear is installed on one side of the base; the lifting driving mechanism is a driving cylinder, the cylinder body of the driving cylinder is fixedly connected to the connecting seat at the top of the supporting column, and the telescopic rod of the driving cylinder is fixedly connected to the horizontal beam. The structure is simple and can realize the control of the forward and backward movement and the up and down lifting of the cardboard bracket.

[0011] Preferably, the telescopic rod of the lifting drive mechanism is connected to the horizontal beam through a length adjustment mechanism, so as to facilitate fine adjustment of the height of the horizontal beam and realize the transfer of the paper pile from the paperboard bracket to the bottom support plate B.

[0012] Preferably, the length adjustment mechanism includes an internal threaded tube, the two ends of the internal threaded tube are respectively threadedly connected with an upper screw and a lower screw, and the threads of the upper screw and the lower screw have opposite rotation directions, the other ends of the upper screw and the lower screw are respectively fixedly connected with the piston rod and the horizontal beam of the lifting drive mechanism, a rotating handle is provided on the outer wall of the internal threaded tube, the upper screw is threadedly connected with an upper locking nut, the upper locking nut abuts against the upper end surface of the internal threaded tube, the lower screw is threadedly connected with a lower locking nut, and the lower locking nut abuts against the bottom end of the internal threaded tube.

[0013] Rotate the upper locking nut and the lower locking nut away from the internal threaded tube, control the positive or reverse rotation of the internal threaded tube by rotating the handle, and adjust the length of the upper screw and the lower screw in the internal threaded tube to fine-tune the height of the horizontal beam. After the adjustment, re-tighten the upper locking nut and the lower locking nut.

[0014] Preferably, two ground rails are arranged side by side, and four corners of the mobile vehicle are respectively provided with a sliding block that slides in cooperation with the corresponding ground rail.

[0015] Preferably, the horizontal beam is detachably connected to the tail end slide, and the cardboard bracket is made of steel plate, so the structure has high strength.

[0016] Preferably, it also includes a paper feeding lifting device for receiving the feeding of the paperboard bracket, and the paper feeding lifting device is located on the right side of the paperboard bracket.

[0017] Preferably, the paper feeding lifting device comprises a first lifting cylinder and a second lifting cylinder which are parallel and vertically arranged. The telescopic ends of the first lifting cylinder and the second lifting cylinder are respectively connected with a side pull plate A and a side pull plate B extending downward. A bottom support plate B is installed between the bottoms of the side pull plate A and the side pull plate B. A connecting beam is installed between the cylinder bodies of the first lifting cylinder and the second lifting cylinder. A supporting foot is respectively installed at the bottom of the first lifting cylinder and the second lifting cylinder. The bottom support plate B is provided with an avoidance groove which matches the bottom support plate A. After the paper pile is transferred to the bottom support plate B, the first lifting cylinder and the second lifting cylinder can be controlled to rise slowly and synchronously, so as to realize stable paper feeding for the laminating machine.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The stacking mechanism of the cardboard laminating machine described in the utility model can pre-stack the paper pile on the cardboard bracket, and can use the first driving mechanism to drive the cardboard bracket to approach the paper feeding lifting device, and control the lifting and lowering of the cardboard bracket through the lifting driving mechanism, so that the paper pile on the cardboard bracket is transferred to the paper feeding lifting device as a whole, shortening the time for the paper feeding lifting device to load the paper pile, improving the loading efficiency of the paper pile, ensuring that the paper feeding lifting device continuously feeds the laminating machine as much as possible, and reducing the downtime of the laminating machine.

[0020] The stacking mechanism of the cardboard laminating machine described in the utility model, the telescopic rod of the lifting drive mechanism is connected to the horizontal beam through a length adjustment mechanism, which is convenient for fine-tuning the height of the horizontal beam to match the bottom support plate B, so as to facilitate the transfer of the paper pile from the cardboard bracket to the bottom support plate B.

[0021] The stacking mechanism of the cardboard laminating machine of the utility model can control the first lifting cylinder and the second lifting cylinder to rise slowly and synchronously after the paper pile is transferred to the bottom support plate B, so as to realize stable paper feeding for the laminating machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0023] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0025] Figure 3 The structure of the utility model is shown in FIG. Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the installation position of the cardboard bracket;

[0027] Figure 5 It is the structural diagram of the bottom support plate A;

[0028] Figure 6 It is the structural diagram of the paper feeding lifting device;

[0029] Figure 7 It is a top view of the bottom support plate B of the utility model;

[0030] In the figure: 1, mobile trolley 2, ground guide rail 3, first driving mechanism 4, supporting column 5, horizontal beam 6, paperboard bracket 6.1, bottom support plate A 7, lifting driving mechanism 8, vertical slide rail 9, tail end slide 10, paper feeding lifting device 10.1, first lifting cylinder 10.2, second lifting cylinder 10.3, side pull plate A 10.4, side pull plate B 10.5, bottom support plate B 10.6, connecting beam 10.7, avoidance groove 11, upper screw rod 12, internal threaded pipe 13, lower screw rod 14, rotating handle 15, upper locking nut 16, lower locking nut 17, base 18, paper pile. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0032] Embodiment 1, as Figure 1-5 As shown, a stacking mechanism of a cardboard laminating machine includes a base 17 supported on the ground, the upper surface of the base 17 has a horizontally arranged ground guide rail 2 and a movable trolley 1 that can move along the length direction of the ground guide rail 2, the movable trolley 1 is equipped with a first driving mechanism 3 that drives the movable trolley 1 to reciprocate along the length direction of the ground guide rail 2, the right end of the movable trolley 1 is equipped with a vertical supporting column 4, the outer wall of the supporting column 4 is equipped with a vertical slide rail 8 along its length direction, and also includes a horizontally arranged horizontal beam 5, the tail end of the horizontal beam 5 is provided with a tail end slide seat 9 that slides with the vertical slide rail 8, the front end of the horizontal beam 5 is equipped with a cardboard bracket 6, the top of the supporting column 4 is equipped with a lifting driving mechanism 7 that drives the horizontal beam 5 to rise and fall, the cardboard bracket 6 includes a back plate connected to the horizontal beam 5, and the bottom of the back plate is provided with a plurality of spaced bottom support plates A6.1, and the bottom of the bottom support plate A6.1 is a long plate-like structure.

[0033] A paper feeding lifting device 10 is provided on the feeding side of the laminating machine, and the paper feeding lifting device 10 is used in conjunction with the paper jam transfer mechanism of the laminating machine. In the present application, a paper pile 18 can be pre-stacked on the cardboard bracket 6, and the first driving mechanism 3 can be used to drive the cardboard bracket 6 to be close to the paper feeding lifting device 10, and the lifting and lowering of the cardboard bracket 6 can be controlled by the lifting driving mechanism 7, so that the paper pile 18 on the cardboard bracket 6 is transferred as a whole to the paper feeding lifting device 10, thereby shortening the time for the paper feeding lifting device 10 to load the paper pile 18, improving the loading efficiency of the paper pile 18, and ensuring that the paper feeding lifting device 10 continuously feeds the laminating machine as much as possible, thereby reducing the downtime of the laminating machine.

[0034] The specific operation process is as follows: Figure 1 As shown, the first driving mechanism 3 is used to drive the moving trolley 1 to move to the left side of the base 17, and then the paper pile 18 is stacked on the paperboard bracket 6. When the paper pile 18 is stacked, the paper pile 18 on the paper feeding lifting device 10 has been used up. Figure 2 As shown, the paper feeding lifting device 10 is lowered to a low position, and then the first driving mechanism 3 controls the paperboard bracket 6 to approach the paper feeding lifting device 10, so that the bottom support plate A6.1 is transferred to the top of the bottom support plate B10.5, and the lifting driving mechanism 7 is controlled to extend to lower the height of the bottom support plate A6.1, so that the bottom support plate A6.1 passes through the avoidance groove 10.7, and the paper pile 18 on the paperboard bracket 6 is transferred to the bottom support plate B10.5, and then the paperboard bracket 6 is controlled to reset, as shown in FIG. Figure 3 As shown, the next round of palletizing is carried out.

[0035] Embodiment 2, as Figure 1-5 As shown, a stacking mechanism of a cardboard laminating machine includes a base 17 supported on the ground, the upper surface of the base 17 has a horizontally arranged ground guide rail 2 and a movable trolley 1 that can move along the length direction of the ground guide rail 2, the movable trolley 1 is equipped with a first driving mechanism 3 that drives the movable trolley 1 to reciprocate along the length direction of the ground guide rail 2, the right end of the movable trolley 1 is equipped with a vertical supporting column 4, the outer wall of the supporting column 4 is equipped with a vertical slide rail 8 along its length direction, and also includes a horizontally arranged horizontal beam 5, the tail end of the horizontal beam 5 is provided with a tail end slide seat 9 that slides with the vertical slide rail 8, the front end of the horizontal beam 5 is equipped with a cardboard bracket 6, the top of the supporting column 4 is equipped with a lifting driving mechanism 7 that drives the horizontal beam 5 to rise and fall, the cardboard bracket 6 includes a back plate connected to the horizontal beam 5, and the bottom of the back plate is provided with a plurality of spaced bottom support plates A6.1, and the bottom of the bottom support plate A6.1 is a long plate-like structure.

[0036] Furthermore, the first driving mechanism 3 includes a reduction motor fixed on the mobile trolley 1, a driving gear is installed on the power output shaft of the reduction motor, and a rack meshing with the driving gear is installed on one side of the base 17; the lifting driving mechanism 7 is a driving cylinder, the cylinder body of the driving cylinder is fixedly connected to the connecting seat at the top of the supporting column 4, and the telescopic rod of the driving cylinder is fixedly connected to the horizontal beam 5. The structure is simple, and the front and rear movement and up and down lifting of the cardboard bracket 6 can be controlled.

[0037] Furthermore, the telescopic rod of the lifting drive mechanism 7 is connected to the horizontal beam 5 through a length adjustment mechanism, so as to facilitate fine adjustment of the height of the horizontal beam 5 and realize the transfer of the paper pile 18 from the paperboard bracket 6 to the bottom support plate B10.5.

[0038] Furthermore, the length adjustment mechanism includes an internal threaded tube 12, the two ends of which are respectively threadedly connected with an upper screw 11 and a lower screw 13, and the thread rotation directions of the upper screw 11 and the lower screw 13 are opposite, the other ends of the upper screw 11 and the lower screw 13 are respectively fixedly connected with the piston rod and the horizontal beam 5 of the lifting drive mechanism 7, and a rotating handle 14 is provided on the outer wall of the internal threaded tube 12, the upper screw 11 is threadedly connected with an upper locking nut 15, and the upper locking nut 15 abuts against the upper end surface of the internal threaded tube 12, and the lower screw 13 is threadedly connected with a lower locking nut 16, and the lower locking nut 16 abuts against the bottom end of the internal threaded tube 12. Rotate the upper locking nut 15 and the lower locking nut 16 away from the internal threaded tube 12, control the forward or reverse rotation of the internal threaded tube 12 by rotating the handle 14, and adjust the length of the upper screw 11 and the lower screw 13 in the internal threaded tube 12 to fine-tune the height of the horizontal beam 5. After the adjustment is completed, re-tighten the upper locking nut 15 and the lower locking nut 16.

[0039] Furthermore, two ground rails 2 are arranged side by side, and four corners of the mobile vehicle 1 are respectively provided with a sliding block that slides in cooperation with the corresponding ground rail 2. The sliding is smooth.

[0040] Furthermore, the horizontal beam 5 is detachably connected to the tail end slide 9, and the paperboard bracket 6 is made of steel plate, so the structure has high strength.

[0041] Furthermore, it also includes a paper feeding lifting device 10 for receiving the feeding of the paperboard bracket 6 , and the paper feeding lifting device 10 is located on the right side of the paperboard bracket 6 .

[0042] Further, refer to Figure 6 and Figure 7 The paper feeding lifting device includes a first lifting cylinder 10.1 and a second lifting cylinder 10.2 which are parallel and vertically arranged. The telescopic ends of the first lifting cylinder 10.1 and the second lifting cylinder 10.2 are respectively connected with a side pull plate A10.3 and a side pull plate B10.4 extending downward. A bottom support plate B10.5 is installed between the bottoms of the side pull plate A10.3 and the side pull plate B10.4. A connecting beam 10.6 is installed between the cylinder bodies of the first lifting cylinder 10.1 and the second lifting cylinder 10.2. A supporting foot is respectively installed at the bottom of the first lifting cylinder 10.1 and the second lifting cylinder 10.2. An avoidance groove 10.7 matching with the bottom support plate A6.1 is opened on the bottom support plate B10.5.

[0043] After the paper pile 18 is transferred to the bottom support plate B10.5, the first lifting cylinder 10.1 and the second lifting cylinder 10.2 can be controlled to rise slowly and synchronously, so as to achieve stable paper feeding for the laminating machine.

[0044] The stacking mechanism of the cardboard laminating machine described in the utility model can pre-stack the paper pile on the cardboard bracket, and can use the first driving mechanism to drive the cardboard bracket to approach the paper feeding lifting device, and control the lifting and lowering of the cardboard bracket through the lifting driving mechanism, so that the paper pile on the cardboard bracket is transferred to the paper feeding lifting device as a whole, shortening the time for the paper feeding lifting device to load the paper pile, improving the loading efficiency of the paper pile, ensuring that the paper feeding lifting device continuously feeds the laminating machine as much as possible, and reducing the downtime of the laminating machine.

[0045] The stacking mechanism of the cardboard laminating machine described in the utility model, the telescopic rod of the lifting drive mechanism is connected to the horizontal beam through a length adjustment mechanism, which is convenient for fine-tuning the height of the horizontal beam to match the bottom support plate B, so as to facilitate the transfer of the paper pile from the cardboard bracket to the bottom support plate B.

[0046] The stacking mechanism of the cardboard laminating machine of the utility model can control the first lifting cylinder and the second lifting cylinder to rise slowly and synchronously after the paper pile is transferred to the bottom support plate B, so as to realize stable paper feeding for the laminating machine.

[0047] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0048] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A stacking mechanism for a cardboard laminating machine, comprising a base supported on the ground, the upper surface of the base having a horizontally arranged ground rail and a movable trolley movable along the length direction of the ground rail, characterized in that: The mobile trolley is provided with a first driving mechanism for driving the mobile trolley to reciprocate along the length direction of the ground guide rail, a vertical supporting column is provided at the right end of the mobile trolley, a vertical slide rail is provided on the outer wall of the supporting column along its length direction, and also includes a horizontally arranged horizontal beam, a tail end slide seat for sliding with the vertical slide rail is provided at the tail end of the horizontal beam, a cardboard bracket is provided at the front end of the horizontal beam, a lifting driving mechanism for driving the horizontal beam to rise and fall is provided at the top of the supporting column, the cardboard bracket includes a back plate connected to the horizontal beam, a plurality of spaced bottom support plates A are provided at the bottom of the back plate, and the bottom support plate A is a long plate-like structure.

2. The stacking mechanism of the cardboard laminating machine according to claim 1, characterized in that: The first driving mechanism includes a reduction motor fixed on the mobile trolley, a driving gear is installed on the power output shaft of the reduction motor, and a rack meshing with the driving gear is installed on one side of the base; the lifting driving mechanism is a driving cylinder, the cylinder body of the driving cylinder is fixedly connected to the connecting seat at the top of the supporting column, and the telescopic rod of the driving cylinder is fixedly connected to the horizontal beam.

3. The stacking mechanism of the cardboard laminating machine according to claim 2, characterized in that: The telescopic rod of the lifting drive mechanism is connected to the horizontal beam through a length adjustment mechanism.

4. The stacking mechanism of the cardboard laminating machine according to claim 3, characterized in that: The length adjustment mechanism includes an internal threaded tube, the two ends of which are respectively threadedly connected with an upper screw and a lower screw, and the threads of the upper screw and the lower screw are in opposite directions. The other ends of the upper screw and the lower screw are respectively fixedly connected with the piston rod and the horizontal beam of the lifting drive mechanism. A rotating handle is provided on the outer wall of the internal threaded tube, the upper screw is threadedly connected with an upper locking nut, and the upper locking nut abuts against the upper end surface of the internal threaded tube, and the lower screw is threadedly connected with a lower locking nut, and the lower locking nut abuts against the bottom end of the internal threaded tube.

5. The stacking mechanism of the cardboard laminating machine according to claim 4, characterized in that: Two ground guide rails are arranged side by side, and four corners of the mobile trolley are respectively provided with a sliding block that slides in cooperation with the corresponding ground guide rail.

6. The stacking mechanism of the cardboard laminating machine according to claim 5, characterized in that: The horizontal crossbeam is detachably connected to the tail end slide seat, and the cardboard bracket is made of steel plate.

7. The stacking mechanism of the cardboard laminating machine according to claim 6, characterized in that: It also comprises a paper feeding lifting device for receiving the feeding of the paperboard bracket, and the paper feeding lifting device is located on the right side of the paperboard bracket.

8. The stacking mechanism of the cardboard laminating machine according to claim 7, characterized in that: The paper feeding lifting device includes a first lifting cylinder and a second lifting cylinder which are parallel to each other and vertically arranged. The telescopic ends of the first lifting cylinder and the second lifting cylinder are respectively connected with a side pull plate A and a side pull plate B extending downward. A bottom support plate B is installed between the bottoms of the side pull plate A and the side pull plate B. A connecting beam is installed between the cylinder bodies of the first lifting cylinder and the second lifting cylinder. A supporting foot is respectively installed at the bottom of the first lifting cylinder and the second lifting cylinder. An avoidance groove matching the bottom support plate A is opened on the bottom support plate B.

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