Corrugated board hot-pressing laminating device capable of preventing edge warping

Abstract

The utility model discloses a corrugated board hot-pressing laminating device capable of preventing edge warping, which relates to the technical field of corrugated board processing and comprises an operation table, a support frame is arranged above one end of the operation table, a lifting mechanism and a hot-pressing plate are mounted on the support frame, and a conveying belt is arranged on the top table surface of the operation table; calibration assemblies are arranged at one end of the operation table and in the operation table. An anti-edge-warping cooling assembly is arranged at the position, located on one side of the calibration assembly, of the top end of the operation table. According to the corrugated board hot-pressing laminating device capable of preventing edge warping, the calibration assembly is arranged, and a corrugated board on the conveying belt can be positioned and pushed to the middle position through synchronous approaching movement of two calibration blocks and is kept to be conveyed in the linear direction, so that deviation cannot be generated during hot-pressing laminating operation, and the production efficiency is improved. And by arranging the edge warping prevention cooling assembly, two-step operation of edge warping prevention and cooling can be completed at the same time, and therefore the device mechanism is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of corrugated board processing, and particularly relates to a corrugated board hot pressing and laminating device for preventing warping edges. Background Technique

[0002] Cartons are an essential part of our daily life and are used in product packaging, transportation, etc. in various industries. Among them, corrugated cartons are a kind of carton packaging product with the widest application, having the advantages of low cost, light weight, easy processing, high strength, excellent printing adaptability, convenient storage and handling, etc. The production of corrugated cartons requires the processing of corresponding corrugated boards. Currently, corrugated boards are usually formed by hot pressing a face paper, a liner paper, a core paper, and corrugated paper processed into a corrugated shape. Therefore, a corrugated board hot pressing and laminating device is a necessary equipment for producing corrugated boards;

[0003] During the use of the existing corrugated board hot pressing and laminating device, manual pushing is required, and the force-bearing surface is uneven, which will result in poor quality of the corrugated board; moreover, it often occurs that the corrugated board is not compacted after being pressed by the hot pressing plate, leading to the situation of easy warping; in addition, because the corrugated board will retain heat after being pressed by the hot pressing plate, but there is no corresponding cooling mechanism, resulting in insufficient firmness of the lamination and easy deterioration of the quality of the corrugated board;

[0004] In order to overcome the above defects, the prior art (a Chinese patent with the publication number of CN220429447U and the application date of August 3, 2023) a corrugated board hot pressing and laminating device for preventing warping edges, through the combined action of a support block, a support plate, a conveyor belt motor, a pulley, and a conveyor belt, increases the conveying function of the corrugated board, can keep the conveying speed unchanged, thereby increasing the force-bearing uniformity and improving its production quality; through the combined action of a connecting block, a rotating column, a rolling pressure wheel, a fixing plate, a threaded rod, and a threaded nut, the height of the rolling pressure wheel is adjusted, that is, the function of preventing warping of the corrugated board is increased; through the combined action of a bottom plate, a support plate, an upper bottom plate, a fan motor, a rotating shaft, and a fan blade, the function of cooling the corrugated board is increased, so that the corrugated board after hot pressing and flattening is quickly cooled and solidified, thereby improving the firmness of the lamination;

[0005] Although the above technology can improve the previous device, during the process of the conveyor belt transporting the corrugated board, it is impossible to ensure the transportation direction of the corrugated board, resulting in easy deviation during the hot pressing and laminating by the hot pressing plate, thereby reducing the processing quality of the device, and the anti-warping and cooling operations of the corrugated board of this device are carried out separately, resulting in a relatively cumbersome overall structure of the device;

[0006] In view of the above problems, it is urgent to innovate and design on the basis of the original equipment. Therefore, we propose a corrugated cardboard hot pressing and laminating device for preventing warping, which can well solve the above problems. Content of the Utility Model

[0007] The purpose of the utility model is to provide a corrugated cardboard hot pressing and laminating device for preventing warping, so as to solve the problems raised in the above background technology that during the process of the conveyor belt transporting corrugated cardboard, the transportation direction of the corrugated cardboard cannot be guaranteed, resulting in easy deviation during the hot pressing and laminating by the hot pressing plate, thus reducing the processing quality of the device, and the anti-warping and cooling operations of the corrugated cardboard by this device are carried out separately, resulting in a relatively cumbersome overall structure of the device.

[0008] To achieve the above purpose, the utility model provides the following technical solution: A corrugated cardboard hot pressing and laminating device for preventing warping, including an operating table, a support frame is arranged above one end of the operating table, a lifting mechanism is fixedly installed at one end of the support frame, a hot pressing plate is fixedly connected to the bottom end of the lifting mechanism, and a conveyor belt is arranged on the top surface of the operating table below the hot pressing plate;

[0009] A calibration component is arranged at one end and inside the operating table. The calibration component includes a first motor fixedly installed on the outer wall of one end of the operating table. The output shaft of the first motor penetrates into the interior of the operating table and is fixedly connected to a bidirectional lead screw. Two symmetrically distributed connecting sliders are threadedly connected to the outer side of the bidirectional lead screw. Two moving grooves are opened on the top surface of the operating table. The two connecting sliders penetrate through the corresponding moving grooves to the top of the operating table and are fixedly connected to calibration blocks. The two calibration blocks are symmetrically distributed on both sides of the top of the conveyor belt. By starting the first motor to drive the bidirectional lead screw to rotate, the rotating bidirectional lead screw drives the two connecting sliders on the outer side to approach each other. The calibration blocks at the tops of the two connecting sliders move synchronously to position and push the corrugated cardboard on the conveyor belt to the middle position and keep it moving in a straight line direction. In this way, when the lifting mechanism drives the hot pressing plate to move downward for hot pressing and laminating operations, there will be no deviation, thus improving the processing quality of the device;

[0010] On one side of the calibration component at the top of the operating table, there is an anti-warping cooling component. The anti-warping cooling component includes a fixed seat fixedly connected to the top surface of the operating table. At the top of the fixed seat, a cylinder is fixedly installed. The bottom output end of the cylinder penetrates to the inside of the fixed seat and is fixedly connected to a mounting seat. Inside the mounting seat, a condensation pipe is fixedly installed. The cylinder can be used to lift and lower the mounting seat and the condensation pipe, so that the height of the condensation pipe can be adjusted according to the thickness of the corrugated cardboard. When the conveyor belt conveys the corrugated cardboard below the condensation pipe, the condensation pipe can roll over the corrugated cardboard to prevent warping, and the condensation pipe itself can quickly cool and solidify the hot-pressed corrugated cardboard to improve the pressing stability. By setting the anti-warping cooling component, the two operations of anti-warping and cooling can be completed simultaneously, thus streamlining the device mechanism.

[0011] Preferably, a second motor is fixedly installed on the outer wall of one end of the operating table. The output shaft of the second motor is fixedly connected to a unidirectional lead screw. The unidirectional lead screw is rotationally connected to one end of the operating table through a support plate. A sliding seat is threadedly connected to the outside of the unidirectional lead screw. The sliding seat is connected to the bottom end of the support frame. By driving the unidirectional lead screw to rotate by the second motor, the rotating unidirectional lead screw drives the sliding seat and the support frame to translate. The lifting mechanism and the hot pressing plate installed on the support frame will also translate synchronously. In this way, the hot pressing plate can repeatedly move and hot press the corrugated cardboard on the conveyor belt, thereby increasing the pressing stability of the hot pressing fit.

[0012] Preferably, the calibration block is composed of two parts: a calibration part and a limiting part. The calibration part is in an "eight"-shaped structure to facilitate quickly calibrating and positioning the offset corrugated cardboard on the conveyor belt. The limiting parts are distributed in parallel to keep the middle corrugated cardboard conveying in a straight line.

[0013] Preferably, the condensation pipe is a continuously bent corrugated tube body. This structure can not only repeatedly roll over the corrugated cardboard on the conveyor belt to effectively achieve the anti-warping effect, but also make the condensed water inside it repeatedly flow through the corrugated cardboard to improve the cooling effect.

[0014] Preferably, one end of the condensation pipe sequentially penetrates the mounting seat, the fixed seat to the outside and is connected to a water supply component. The water supply component includes a water pump connected to the bottom end of the condensation pipe. One side input end of the water pump is fixedly connected to a water tank through a connecting pipe. Through the setting of the water pump and the water tank, the condensation pipe can be continuously supplied with water.

[0015] Preferably, the condensation pipe is connected to the output end of the water pump through a connecting hose, and vertical grooves for the condensation pipe to pass through are opened at the ends of the fixed seat and the mounting seat. Through the setting of the connecting hose and the vertical grooves, when the cylinder lifts and lowers the mounting seat and the condensation pipe, the length of the pipe body between the condensation pipe and the water pump can be correspondingly adjusted to ensure the normal operation of the anti-warping cooling component.

[0016] Preferably, buffer components are arranged at both ends of the mounting base. The buffer components include limiting sliders fixedly connected to the outer walls at both ends of the mounting base. Limiting chutes are provided on the inner walls at both ends of the fixed base. The two limiting sliders slide inside the corresponding limiting chutes. Two symmetrically distributed fixed columns are fixedly connected between the inner wall at the top of the fixed base and the top surface of the operating table. The two limiting sliders are movably sleeved outside the corresponding fixed columns. Springs are fixedly connected between the bottom ends of the two limiting sliders and the top surface of the operating table. The springs are located outside the fixed columns. Through the limiting sliding of the limiting sliders with the limiting chutes and the fixed columns, the stability of the mounting base and the condenser tube moving up and down along the inside of the fixed base can be increased. Moreover, the setting of the springs can provide a continuous upward supporting force for the mounting base to prevent the mounting base and the condenser tube from descending too much, making it difficult for the corrugated cardboard to pass through.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: For this corrugated cardboard hot pressing and laminating device for preventing edge warping, by setting a calibration component, the corrugated cardboard on the conveyor belt can be positioned and pushed to the middle position and kept moving in a straight line by the synchronous approaching movement of the two calibration blocks. In this way, during the hot pressing and laminating operation, there will be no deviation, thus improving the processing quality of the device. By setting an anti-edge-warping cooling component, the two operations of anti-edge-warping and cooling can be completed simultaneously, thus streamlining the device mechanism. The specific content is as follows:

[0018] (1) By setting a calibration component, start the first motor to drive the bidirectional lead screw to rotate. The rotating bidirectional lead screw drives the two connecting sliders and the calibration blocks to approach each other, and the corrugated cardboard on the conveyor belt can be positioned and pushed to the middle position and kept moving in a straight line. In this way, when the lifting mechanism drives the hot pressing plate to move downward for the hot pressing and laminating operation, there will be no deviation, thus improving the processing quality of the device;

[0019] (2) By setting an anti-edge-warping cooling component, the cylinder can be used to lift and lower the mounting base and the condenser tube, and the height of the condenser tube can be adjusted according to the thickness of the corrugated cardboard. When the conveyor belt conveys the corrugated cardboard under the condenser tube, the condenser tube can roll over the corrugated cardboard to prevent edge warping, and the condenser tube itself can quickly cool and solidify the hot-pressed corrugated cardboard to improve the pressing stability. By setting the anti-edge-warping cooling component, the two operations of anti-edge-warping and cooling can be completed simultaneously, thus streamlining the device mechanism;

[0020] (3) Through the coordinated use of the second motor, the unidirectional lead screw and the sliding seat, the support frame can be driven to translate. The lifting mechanism and the hot pressing plate installed on the support frame will also translate synchronously. In this way, the hot pressing plate can repeatedly move and hot press the corrugated cardboard on the conveyor belt, thus increasing the stability of the hot pressing and laminating;

[0021] (4) By connecting the end of the condenser tube to the water pump and the water tank, continuous water supply to the condenser tube can be achieved. And through the vertical groove provided at the end of the fixed seat and the mounting seat, and the connection hose between the condenser tube and the output end of the water pump, the length of the tube between the condenser tube and the water pump can be adjusted when the cylinder lifts and lowers the mounting seat and the condenser tube, so as to ensure the normal operation of the anti-warping edge cooling component;

[0022] (5) By arranging buffer components at both ends of the mounting seat, and using the limiting sliding of the limiting slider with the limiting chute and the fixed column, the stability of the mounting seat and the condenser tube moving up and down along the inner side of the fixed seat can be effectively increased. And the setting of the spring can provide a continuous upward supporting force for the mounting seat to prevent the mounting seat and the condenser tube from descending too much, which may cause difficulty for the corrugated cardboard to pass through. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2 is a schematic diagram of the structure of the present utility model from another perspective;

[0025] Figure 3 is a schematic diagram of the internal sectional structure of the operating platform of the present utility model;

[0026] Figure 4 is a schematic diagram of the internal sectional structure of the fixed seat of the present utility model;

[0027] Figure 5 is the present utility model Figure 4 the enlarged structure schematic diagram at A in;

[0028] Figure 6 is a schematic diagram of the internal sectional structure of the mounting seat of the present utility model.

[0029] In the figure: 1, operating platform; 2, support frame; 3, lifting mechanism; 4, hot pressing plate; 5, conveyor belt; 6, first motor; 7, bidirectional lead screw; 8, connecting slider; 9, moving groove; 10, calibration block; 11, second motor; 12, unidirectional lead screw; 13, sliding seat; 14, fixed seat; 15, cylinder; 16, mounting seat; 17, condenser tube; 18, connecting hose; 19, water pump; 20, water tank; 21, limiting slider; 22, limiting chute; 23, fixed column; 24, spring. Detailed Embodiment

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0031] Embodiment 1: Please refer to Figures 1-6 , the present invention provides the following technical solution: A corrugated cardboard hot pressing and laminating device for preventing warping includes an operating table 1. Above one end of the operating table 1, there is a support frame 2. At one end of the support frame 2, a lifting mechanism 3 is fixedly installed. The bottom end of the lifting mechanism 3 is fixedly connected to a hot pressing plate 4. On the top surface of the operating table 1, below the hot pressing plate 4, there is a conveyor belt 5;

[0032] On the outer wall of one end of the operating table 1, a second motor 11 is fixedly installed. The output shaft of the second motor 11 is fixedly connected to a unidirectional lead screw 12. The unidirectional lead screw 12 is rotationally connected to one end of the operating table 1 through a support plate. A sliding seat 13 is threadedly connected to the outer side of the unidirectional lead screw 12. The sliding seat 13 is connected to the bottom end of the support frame 2. By driving the unidirectional lead screw 12 to rotate through the second motor 11, the rotating unidirectional lead screw 12 drives the sliding seat 13 and the support frame 2 to translate. The lifting mechanism 3 and the hot pressing plate 4 installed on the support frame 2 will also translate synchronously. In this way, the hot pressing plate 4 can repeatedly move and hot press the corrugated cardboard on the conveyor belt 5, thereby increasing the stability of the hot pressing and laminating.

[0033] On one end and inside the operating table 1, there is a calibration component. The calibration component includes a first motor 6 fixedly installed on the outer wall of one end of the operating table 1. The output shaft of the first motor 6 penetrates into the inside of the operating table 1 and is fixedly connected to a bidirectional lead screw 7. Two symmetrically distributed connecting sliders 8 are threadedly connected to the outer side of the bidirectional lead screw 7. On the top surface of the operating table 1, there are two moving grooves 9. The two connecting sliders 8 penetrate through the corresponding moving grooves 9 to the top of the operating table 1 and are fixedly connected to calibration blocks 10. The two calibration blocks 10 are symmetrically distributed on both sides of the top of the conveyor belt 5. The calibration block 10 is composed of a calibration part and a limiting part. The calibration part is in an "eight" - shaped structure to facilitate quickly calibrating and positioning the offset corrugated cardboard on the conveyor belt 5. The limiting parts are distributed in parallel to keep the middle corrugated cardboard moving in a straight line. By starting the first motor 6 to drive the bidirectional lead screw 7 to rotate, the rotating bidirectional lead screw 7 drives the two outer connecting sliders 8 to approach each other. The calibration blocks 10 at the tops of the two connecting sliders 8 move synchronously to position and push the corrugated cardboard on the conveyor belt 5 to the middle position and keep it moving in a straight line direction. In this way, when the lifting mechanism 3 drives the hot pressing plate 4 to move downward for hot pressing and laminating operations, there will be no deviation, thereby improving the processing quality of the device.

[0034] Example Two:

[0035] On the basis of Example One, on one side of the calibration component at the top of the operating table 1, an anti-warping cooling component is provided. The anti-warping cooling component includes a fixed seat 14 fixedly connected to the top surface of the operating table 1. At the top of the fixed seat 14, a cylinder 15 is fixedly installed. The bottom output end of the cylinder 15 penetrates to the inside of the fixed seat 14 and is fixedly connected to a mounting seat 16. Inside the mounting seat 16, a condensation pipe 17 is fixedly installed. The condensation pipe 17 is a continuously bent corrugated pipe body. This structure can repeatedly roll over the corrugated cardboard on the conveyor belt 5 to effectively achieve the effect of preventing warping, and also enable the condensed water inside it to repeatedly flow through the corrugated cardboard, so as to improve the cooling effect. The cylinder 15 can be used to lift and lower the mounting seat 16 and the condensation pipe 17, so that the height of the condensation pipe 17 can be adjusted according to the thickness of the corrugated cardboard. When the conveyor belt 5 conveys the corrugated cardboard to the lower part of the condensation pipe 17, the condensation pipe 17 can roll over the corrugated cardboard to prevent warping, and the condensation pipe 17 itself can quickly cool and solidify the corrugated cardboard after hot pressing to improve the pressing stability. By setting the anti-warping cooling component, the two operations of preventing warping and cooling can be completed simultaneously, thus streamlining the device mechanism;

[0036] One end of the condensation pipe 17 sequentially penetrates through the mounting seat 16 and the fixed seat 14 to the outside and is connected to a water supply component. The water supply component includes a water pump 19 connected to the bottom end of the condensation pipe 17. One side input end of the water pump 19 is fixedly connected to a water tank 20 through a connecting pipe. Through the setting of the water pump 19 and the water tank 20, continuous water supply can be carried out for the condensation pipe 17. It should be particularly noted that the condensation pipe 17 and the output end of the water pump 19 are connected through a connecting hose 18, and vertical grooves for the condensation pipe 17 to pass through are opened at the ends of the fixed seat 14 and the mounting seat 16. Through the setting of the connecting hose 18 and the vertical grooves, the length of the pipe body between the condensation pipe 17 and the water pump 19 can be correspondingly adjusted when the cylinder 15 lifts and lowers the mounting seat 16 and the condensation pipe 17 to ensure the normal operation of the anti-warping cooling component;

[0037] Buffer components are provided at both ends of the mounting base 16. The buffer components include limit sliders 21 fixedly connected to the outer walls at both ends of the mounting base 16. Limit sliding grooves 22 are provided on the inner walls at both ends of the fixed base 14. The two limit sliders 21 slide inside the corresponding limit sliding grooves 22. Two symmetrically distributed fixed columns 23 are fixedly connected between the inner wall of the top end of the fixed base 14 and the top surface of the operating table 1. The two limit sliders 21 are movably sleeved outside the corresponding fixed columns 23. A spring 24 is fixedly connected between the bottom ends of the two limit sliders 21 and the top surface of the operating table 1. The spring 24 is located outside the fixed column 23. Through the limit sliding of the limit slider 21 with the limit sliding groove 22 and the fixed column 23, the stability of the mounting base 16 and the condenser tube 17 moving up and down along the inside of the fixed base 14 can be increased. And the setting of the spring 24 can provide a continuously upward supporting force for the mounting base 16 to prevent the mounting base 16 and the condenser tube 17 from descending too much, resulting in difficulty for the corrugated cardboard to pass through.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A corrugated cardboard hot-pressing laminating device for preventing edge warping, comprising an operating table (1), a support frame (2) is arranged above one end of the operating table (1), a lifting mechanism (3) is fixedly installed at one end of the support frame (2), a hot pressing plate (4) is fixedly connected to the bottom end of the lifting mechanism (3), and a conveyor belt (5) is arranged on the top surface of the operating table (1) below the hot pressing plate (4); Features: A calibration component is provided at one end and inside the operating table (1), and the calibration component comprises a first motor (6) fixedly mounted on the outer wall of one end of the operating table (1), the output shaft of the first motor (6) passes through the inside of the operating table (1) and is fixedly connected to a bidirectional screw rod (7), the outer side of the bidirectional screw rod (7) is threadedly connected to two symmetrically distributed connecting slide blocks (8), the top table surface of the operating table (1) is provided with two movable grooves (9), the two connecting slide blocks (8) pass through the corresponding movable grooves (9) to the top of the operating table (1) and are fixedly connected to a calibration block (10), and the two calibration blocks (10) are symmetrically distributed on both sides of the top of the conveyor belt (5); An anti-warping cooling assembly is provided at the top of the operating table (1) on one side of the calibration assembly, the anti-warping cooling assembly comprising a fixing seat (14) fixedly connected to the top surface of the operating table (1), a cylinder (15) is fixedly mounted on the top of the fixing seat (14), a bottom output end of the cylinder (15) passes through the inside of the fixing seat (14) and is fixedly connected to a mounting seat (16), and a condenser (17) is fixedly mounted on the inside of the mounting seat (16).

2. The device for hot pressing and laminating corrugated paperboard to prevent edge warping according to claim 1, characterized in that: A second motor (11) is fixedly mounted on the outer wall of one end of the operating table (1); the output shaft of the second motor (11) is fixedly connected to a one-way screw rod (12); the one-way screw rod (12) is rotatably connected to one end of the operating table (1) via a support plate; the outer side of the one-way screw rod (12) is threadedly connected to a slide seat (13); and the slide seat (13) is connected to the bottom end of the support frame (2).

3. The device for hot pressing and laminating corrugated paperboard to prevent edge warping according to claim 1, characterized in that: The calibration block (10) consists of a calibration part and a limiting part. The calibration part is in an "eight"-shaped structure, and the limiting parts are distributed in parallel.

4. The device for hot pressing and laminating corrugated paperboard to prevent edge warping according to claim 1, characterized in that: The condenser tube (17) is in the form of a continuously bent wavy tube.

5. The device for hot pressing and laminating corrugated paperboard to prevent edge warping according to claim 4, characterized in that: One end of the condenser tube (17) passes through the mounting seat (16) and the fixing seat (14) in sequence to the outside and is connected to a water supply component, the water supply component comprising a water pump (19) connected to the bottom end of the condenser tube (17), and one side input end of the water pump (19) is fixedly connected to a water tank (20) via a connecting pipe.

6. A hot-pressing laminating device for corrugated paperboard to prevent edge warping according to claim 5, characterized in that: The condenser pipe (17) is connected to the output end of the water pump (19) via a connecting hose (18), and the ends of the fixing seat (14) and the mounting seat (16) are provided with vertical grooves for the condenser pipe (17) to pass through.

7. A hot-pressing laminating device for corrugated paperboard to prevent edge warping according to claim 6, characterized in that: Buffer components are provided at both ends of the mounting seat (16), and the buffer components include limit sliders (21) fixedly connected to the outer walls at both ends of the mounting seat (16); limit slide grooves (22) are provided on the inner walls at both ends of the fixing seat (14); the two limit sliders (21) slide on the inner sides of the corresponding limit slide grooves (22); two symmetrically distributed fixed columns (23) are fixedly connected between the top inner wall of the fixing seat (14) and the top table surface of the operating table (1); the two limit sliders (21) are movably sleeved on the outer sides of the corresponding fixed columns (23); a spring (24) is fixedly connected between the bottom ends of the two limit sliders (21) and the top table surface of the operating table (1); and the spring (24) is located on the outer sides of the fixed columns (23).

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