A wet granulation and drying machine for animal drug granules

Abstract

This utility model belongs to the field of pharmaceutical equipment technology and discloses an integrated wet granulation and drying machine for animal drug granules. The integrated machine includes a support plate and a connecting tank fixed thereon. The connecting tank contains heating wires, fan blades, and a spray pipe, and a motor is located at the bottom. Support legs are located at the four corners of the bottom of the support plate, and each support leg integrates a support deployment mechanism composed of an electric push rod, rack, gear, and rotating rod, which, in conjunction with two-stage telescopic support columns, enhances stability. An opening is opened on the bottom side wall of the connecting tank, and a support box communicating with the opening is provided on the support plate. The box contains a hydraulic push rod driving a rubber block to seal the opening, and is equipped with a fan, connecting pipe, and a fixing plate for isolation and protection. This utility model effectively solves the vibration problem during high-speed granulation by dynamically adjusting the support range; and by utilizing a side-mounted hydraulic sealing structure and an automatic blowing and cleaning system, it achieves efficient sealing and automated cleaning of the discharge port, preventing cross-contamination and improving the quality of granule production.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical equipment technology, and in particular to an integrated wet granulation and drying machine for animal drug granules. Background Technology

[0002] Animal drug granules, a common dosage form in veterinary drug preparations, typically involve raw material pretreatment, mixing, granulation, and drying. In wet granulation, a binder is added to the drug powder and the mixture is stirred at high speed to form a soft mass and granules. However, in existing granulation and drying equipment, to ensure uniform mixing, the motor-driven stirring components often require high rotational speeds, which leads to significant vibration and centrifugal force.

[0003] Existing animal drug granulation equipment typically uses a fixed support leg structure, which has a limited ground contact area and non-adjustable support range. When the equipment is performing high-speed granulation operations or with a large load, this fixed support structure often fails to effectively counteract mechanical vibration, causing the machine to sway. This not only affects the uniformity of material mixing and the quality of granulation, but long-term vibration may also cause the equipment fasteners to loosen, posing a safety hazard.

[0004] Furthermore, the discharge structure design of existing equipment is often quite simple, with the discharge port mostly sealed by manual valves or simple cover plates, making it difficult to guarantee sealing performance and easily causing leakage of precious medicinal powders. Moreover, after batch production, sticky materials are easily left behind in the discharge channel and sealing area. These residues are difficult to clean completely by automated means, and manual cleaning is also incomplete, which can easily breed bacteria or cause cross-contamination between different batches of drugs, failing to meet the high standards of hygiene and automation required for modern animal drug production.

[0005] Therefore, this utility model proposes an integrated wet granulation and drying machine for animal drug granules to address the shortcomings of existing technologies. Utility Model Content

[0006] In view of the problems in the existing technology of animal drug granulation equipment, such as poor stability and large machine vibration due to the single support structure when operating at high speed, and insufficient sealing of the discharge port and difficulty in achieving automatic and thorough cleaning, which easily leads to cross-contamination, this utility model aims to provide an integrated wet granulation and drying machine for animal drug granules with an improved structure that can effectively solve the above problems.

[0007] This utility model provides an integrated wet granulation and drying machine for animal drug granules, comprising: a support plate, a connecting tank fixedly connected to the top of the support plate, and support legs fixedly connected to the four corners of the bottom of the support plate; a spray pipe is fixedly connected to the top of the connecting tank, and a feed inlet is fixedly connected to one side of the top of the connecting tank; an electric heating wire is spirally wound and fixedly connected to the inner wall of the connecting tank; a motor is fixedly connected to the bottom of the connecting tank, and the output shaft of the motor passes through the bottom of the connecting tank and is fixedly connected to a fan blade located inside the connecting tank; An opening is provided on the bottom side wall of the connecting tank; a support box is fixedly connected to the top of the support plate, the support box is located on one side of the connecting tank and the interior of the support box communicates with the opening; a hydraulic push rod is fixedly connected to the inner wall of the support box, the output end of the hydraulic push rod extends into the interior of the support box and is fixedly connected to a rubber block, the rubber block is sealed to the opening; a discharge port is connected to the bottom of the support box.

[0008] The opening is located on the bottom side wall of the connecting tank, serving as a channel for material outflow. Together with the side-mounted support box and the internally driven rubber block by the hydraulic push rod, it forms a lateral compression-type sealed discharge structure. This design allows for more precise discharge control and provides greater sealing pressure through hydraulic drive.

[0009] Furthermore, the support box and the connecting tank are connected through the opening, and the hydraulic push rod is horizontally installed inside the support box. Its driving direction is consistent with the axial direction of the opening. The opening is blocked or opened by the front and rear displacement of the rubber block, thereby realizing the automated control of material transfer.

[0010] Preferably, the top of the support box is connected to a connecting box, a fan is fixedly connected inside the connecting box, and a filter screen is fixedly connected to the opening at the top of the connecting box. This structure utilizes the fan to introduce clean air filtered by the filter screen, which on the one hand assists in the drying and feeding of wet particles, and on the other hand provides a purging airflow during the cleaning stage.

[0011] Preferably, a connecting pipe is connected to the side wall of the support box, with one end of the connecting pipe extending into the interior of the support box. A fixing plate is fixedly connected inside the support box, and the hydraulic push rod passes through the fixing plate. The fixing plate divides the interior of the support box into an installation cavity and a discharge cavity. The main body of the hydraulic push rod is located in the installation cavity, and the rubber block is located in the discharge cavity. This preferred solution achieves dry and wet separation through the fixing plate, protecting the electrical components located in the installation cavity. At the same time, the connecting pipe introduces cleaning fluid, which, in conjunction with the airflow of the fan, enables automated cleaning of the discharge cavity.

[0012] Preferably, an electric push rod is fixedly connected to the outer wall of the support leg, and a slide rail is provided on the inner wall of the support leg. A rack is slidably connected within the slide rail, and the output end of the electric push rod is fixedly connected to the top end of the rack. This structure provides a linear driving force in the vertical direction, providing a power source for the subsequent deployment of the support structure.

[0013] Preferably, a rotating rod is rotatably connected to the side wall of the support leg. A gear is fixedly sleeved at one end of the rotating rod, and the gear meshes with the rack. A first support column is fixedly connected to the other end of the rotating rod. Through the meshing transmission between the rack and the gear, the linear motion of the electric push rod is converted into the rotational motion of the rotating rod, thereby driving the first support column to unfold outward and increasing the support span.

[0014] Preferably, a limiting block is fixedly connected to the inner wall of the bottom end of the slide rail, and the limiting block is located below the movement path of the rack. The limiting block plays a mechanical limiting role, preventing the rack from dislodging from the slide rail and ensuring the safety of the mechanism's operation.

[0015] Preferably, a second support column is slidably inserted into the first support column. This sleeve-type structure allows for adjustment of the support length, adapting to ground surfaces with varying flatness.

[0016] Preferably, both the outer walls of the first and second support columns have a plurality of screw holes, and the first and second support columns are fixedly connected by bolts passing through the aligned screw holes. This multi-hole bolt locking method provides a reliable rigid connection, ensuring support stability in high-vibration environments.

[0017] This utility model has the following beneficial effects: 1. In this utility model, by setting a linkage unfolding mechanism on the side of the support leg, which is driven by an electric push rod to move the rack linearly and then drive the gear and the rotating rod to rotate, and in conjunction with the two-stage telescopic fixed support column structure, the problem of insufficient machine stability caused by high center of gravity or large vibration when the motor is stirring at high speed is solved. The technical effect of dynamically expanding the support range of the equipment, increasing the grounding area to effectively offset mechanical vibration, ensuring uniform mixing of materials and smooth granulation process is achieved.

[0018] 2. In this utility model, by setting a sealing structure on the side wall of the support box to drive the rubber block to cooperate with the bottom opening of the connecting tank, the problem of poor sealing of the discharge port of the traditional pellet mill, which easily leads to material leakage and difficulty in automatic control of discharge, is solved. The technical effect of flexibly controlling the discharge on and off, ensuring the sealing of the tank during the pelleting process, and realizing the automatic transfer of soft material particles is achieved. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an integrated wet granulation and drying machine for animal drug granules proposed in this utility model; Figure 2 This is a cross-sectional schematic diagram of the connecting tank of an integrated wet granulation and drying machine for animal drug granules proposed in this utility model; Figure 3 This is a schematic diagram of the support leg of a wet granulation and drying integrated machine for animal drug granules proposed in this utility model; Figure 4 This is a cross-sectional schematic diagram of the support box of an integrated wet granulation and drying machine for animal drug granules proposed in this utility model.

[0020] Legend: 1. Connecting tank; 2. Support plate; 3. Support leg; 4. Feed inlet; 5. Spray pipe; 6. Heating wire; 7. Motor; 8. Fan blade; 9. Opening; 10. Electric push rod; 11. Rack; 12. Gear; 13. First support column; 14. Rotating rod; 15. Second support column; 16. Bolt; 17. Screw hole; 18. Limiting block; 19. Slide rail; 20. Support box; 21. Connecting box; 22. Fan; 23. Filter screen; 24. Hydraulic push rod; 25. Fixing plate; 26. Rubber block; 27. Connecting pipe; 28. Discharge port. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] Example: Please refer to Figures 1 to 4 This utility model provides an integrated wet granulation and drying machine for animal drug granules, which aims to solve the problems of insufficient stability of existing animal drug granulation equipment during high-speed operation, poor sealing at the discharge port, and difficulty in automated cleaning leading to residue deterioration.

[0023] like Figure 1 and Figure 2As shown, the main structure of the integrated wet granulation and drying machine for animal drug granules includes a support plate 2 and a connecting tank 1 fixedly connected to the top center of the support plate 2. The support plate 2 serves as the bearing platform of the entire device, used to stably support the granulation components above and the discharge components on the side. The connecting tank 1 serves as the core area for material processing, used for mixing, granulating and drying animal drug raw materials. Support legs 3 are fixedly connected to the four corners of the bottom of the support plate 2. The support legs 3 are used to set up the device on the ground and provide basic support height.

[0024] like Figure 2 and Figure 4 As shown, to achieve the addition of granulation raw materials and environmental control, a spray pipe 5 is fixedly connected to the center of the top of the connecting tank 1. The spray pipe 5 is used to atomize and spray the adhesive solution into the tank. A feed inlet 4 is fixedly connected to one side of the top of the connecting tank 1. The feed inlet 4 is used to add animal drug powder raw materials. An electric heating wire 6 is fixedly connected to the inner wall of the connecting tank 1 in a spiral shape. The electric heating wire 6 is used to generate heat to maintain the process temperature inside the tank. A motor 7 is fixedly connected to the bottom of the connecting tank 1. The output shaft of the motor 7 passes through the bottom wall of the connecting tank 1 and extends into the interior. A fan blade 8 is fixedly connected to the end of the output shaft of the motor 7, located at the bottom of the interior of the connecting tank 1. The fan blade 8 is used to rotate at high speed under the drive of the motor 7 to stir the mixture. An opening 9 is opened on the bottom side wall of the connecting tank 1. The opening 9 is used to discharge the prepared soft material granules.

[0025] like Figure 1 and Figure 4As shown, to achieve discharge control and automated cleaning, a support box 20 is fixedly connected to the top of the support plate 2. The support box 20 is located on one side of the connecting tank 1, and its internal cavity is directly connected to the opening 9. A hydraulic push rod 24 is fixedly connected to the inner wall of the support box 20 on the side away from the connecting tank 1. The hydraulic push rod 24 is used to provide linear driving force. The output end of the hydraulic push rod 24 extends into the support box 20 and is fixedly connected to a rubber block 26. The outer wall size of the rubber block 26 is adapted to the inner wall size of the opening 9. The rubber block 26 is used to insert into the opening 9 under the push of the hydraulic push rod 24 and seal with the opening 9 to block the material flow, or to open the opening 9 when it retracts. The bottom of the support box 20 is connected to an inclined discharge port 28, which is used to guide the material or waste liquid out. The top of the box 20 is connected to a connecting box 21. A fan 22 is fixedly connected inside the connecting box 21. A filter screen 23 is fixedly connected to the top opening of the connecting box 21. The filter screen 23 is used to filter the incoming air. The fan 22 is used to blow high-pressure air into the support box 20 to assist in material feeding and cleaning. A connecting pipe 27 is fixedly connected through one side wall of the support box 20. One end of the connecting pipe 27 extends into the inside of the support box 20. The connecting pipe 27 is used to connect to an external water source to inject cleaning fluid into the box. A fixing plate 25 is fixedly connected inside the support box 20. The telescopic end of the hydraulic push rod 24 passes through the fixing plate 25. The fixing plate 25 divides the inside of the support box 20 into an installation cavity and a material discharge cavity. The main body of the hydraulic push rod 24 is located in the installation cavity to avoid contact with liquid. A rubber block 26 is located in the material discharge cavity for sealing operations.

[0026] To address the stability issues of the granulator during high-speed operation, this integrated wet granulation and drying machine for animal drug granules also includes a stability enhancement structure for dynamically adjusting the support range. This structure forms a specific mating connection with the support legs 3 at the bottom of the support plate 2.

[0027] Please refer to the following carefully. Figure 3 Each support leg 3 has an electric push rod 10 fixedly connected to its outer side wall. The electric push rod 10 serves as a linear drive source and is used to output reciprocating thrust in the vertical direction. The inner side wall of the support leg 3 has a slide rail 19 extending in the vertical direction. The slide rail 19 is used to limit the movement trajectory. A rack 11 is slidably connected inside the slide rail 19. The rack 11 can move up and down along the length of the slide rail 19. The output end of the electric push rod 10 is fixedly connected to the top of the rack 11. The extension and retraction movement of the electric push rod 10 directly drives the rack 11 to move synchronously within the slide rail 19. To prevent the rack 11 from detaching from the slide rail 19, a limit block 18 is fixedly connected to the inner wall of the bottom end of the slide rail 19. The limit block 18 is located below the movement path of the rack 11 and is used to mechanically block the rack 11 at its downward limit position.

[0028] Meanwhile, a rotating rod 14 is rotatably connected to the side wall of the support leg 3. A gear 12 is fixedly sleeved at one end of the rotating rod 14. The gear 12 and the rack 11 are always in meshing connection. When the electric push rod 10 drives the rack 11 to move linearly along the slide rail 19, the rack 11 drives the gear 12 to rotate, which in turn drives the rotating rod 14 to rotate around its connection point with the support leg 3. This transmission cooperation between the rack 11 and the gear 12 converts linear motion into rotational motion, realizing the unfolding and retraction of the support structure. A first support column 13 is fixedly connected to the other end of the rotating rod 14. The first support column 13 opens outward as the rotating rod 14 rotates, increasing the overall ground contact span of the device.

[0029] Furthermore, the first support column 13 has a hollow internal structure, and a second support column 15 is slidably inserted inside it. The second support column 15 is used to adjust the total length of the support to adapt to the ground height difference. The outer walls of the first support column 13 and the second support column 15 are provided with a number of screw holes 17 spaced apart along the axial direction. In use, after the second support column 15 is stretched to a suitable length, the first support column 13 and the second support column 15 are fastened and locked by bolts 16 passing through the aligned screw holes 17, forming a rigidly connected extended support arm, thereby effectively offsetting the vibration generated by the high-speed operation of the motor 7 and ensuring that the granulation process proceeds smoothly.

[0030] Based on the above embodiments, the present invention also includes the following preferred technical solutions: As a preferred embodiment, in order to achieve automated cleaning inside the device and prevent cross-contamination, please refer to... Figure 4 A connecting pipe 27 is fixedly connected through the side wall of the support box 20. One end of the connecting pipe 27 extends into the interior of the support box 20, and the other end of the connecting pipe 27 can be connected to an external clean water source for injecting high-pressure water into the support box 20 to rinse the inner wall and residual materials.

[0031] To facilitate cleaning and accelerate drying, a connecting box 21 is connected to the top of the support box 20. A fan 22 is fixedly installed inside the connecting box 21. The fan 22 acts as an airflow generator, used to generate high-speed airflow to sweep the inside of the support box 20, accelerating moisture evaporation and the discharge of residual dust. A filter screen 23 is fixedly connected to the opening at the top of the connecting box 21. The filter screen 23 is used to block external dust and impurities from entering the connecting box 21 and the support box 20, ensuring the cleanliness of the blown air and preventing secondary contamination of the drug particles.

[0032] As another preferred embodiment, to protect electrical components from humid environments, please refer to... Figure 4A fixing plate 25 is fixedly connected inside the support box 20. The fixing plate 25 divides the inside of the support box 20 into two independent chambers: an installation chamber near the body of the hydraulic push rod 24 and a material discharge chamber near the side of the connecting tank 1. The main body of the hydraulic push rod 24 is installed in the dry installation chamber, and its telescopic end passes through the fixing plate 25 and extends into the material discharge chamber to connect with the rubber block 26. This separation design effectively prevents cleaning water and moisture from entering the installation chamber, extends the service life of the hydraulic push rod 24, and also prevents the material brought out by the rubber block 26 from contaminating the drive mechanism.

[0033] Furthermore, the rubber block 26 is preferably made of corrosion-resistant and elastic food-grade silicone material, which can not only ensure a tight and flexible seal with the opening 9 to prevent particle leakage, but also withstand the rinsing of cleaning liquid and the erosion of drug components, thus meeting pharmaceutical hygiene standards.

[0034] Working principle: When the device is started to carry out the granulation and drying of animal drugs, the pretreated animal drug raw materials are first quantitatively fed into the tank through the feed port 4 at the top of the connecting tank 1. The heating wires 6 around the inner wall of the connecting tank 1 are then activated. The heating wires 6 are energized and heat the material to maintain the temperature inside the tank within the process range suitable for the activity of the animal drug components. Then, the spray pipe 5 at the top center of the connecting tank 1 is opened. The spray pipe 5 sprays the binder solution in an atomized form, so that the animal drug material is evenly wetted while being heated, and gradually forms a soft material that is ready for granulation.

[0035] At this time, the motor 7 connected to the bottom of the tank 1 starts synchronously, and its output shaft drives the fan blades 8 on the bottom surface of the tank to rotate. The spiral blades of the fan blades 8 not only fully stir the wetted material to ensure that the adhesive, powder and excipients are mixed evenly, but also make the material form a circulating flow in the tank to avoid local overheating or uneven wetting.

[0036] To ensure the stability of the device's operation, during the entire operation, the electric push rods 10 on the four corner support legs 3 of the support plate 2 are dynamically adjusted according to the actual ground conditions and vibration reduction requirements. The output end of the electric push rod 10 pushes the rack 11 to move upward along the slide rail 19 on the inner side of the support leg 3. The limiting block 18 at the bottom of the slide rail 19 hard limits the stroke of the rack 11 to prevent it from leaving the transmission path. During the upward movement of the rack 11, it meshes with the gear 12 at the end of the rotating rod 14 on the side wall of the support leg 3, driving the rotating rod 14 to rotate outward, thereby causing the first support column 13 connected to the end of the rotating rod 14 to unfold synchronously.

[0037] Then, the second support column 15 nested inside the first support column 13 is manually pulled downwards until the support foot at the bottom of the second support column 15 touches the ground. Then, the bolts 16 are inserted into the screw holes 17 at the corresponding positions of the first support column 13 and the second support column 15 to complete the locking and fixing. This operation increases the grounding area and effectively counteracts the centrifugal force and vibration generated by the motor 7 and fan blades 8 when the device is running, avoiding uneven material mixing or unqualified particle formation due to equipment instability.

[0038] Once the soft material reaches the preset humidity and mixing degree, the hydraulic push rod 24 on the side of the support box 20 on the support plate 2 is activated. The rubber block 26 connected to its output end retracts horizontally, and the rubber block 26 disengages from the sealing engagement with the bottom opening 9 of the connecting tank 1. At this time, the wet granules that have been initially formed in the tank flow continuously into the temporary storage cavity of the support box 20 through the opening 9 under the auxiliary thrust of their own gravity and the stirring of the fan blade 8, and are finally discharged from the discharge port 28 set at the bottom of the support box 20, thus completing the material transfer in the granulation process.

[0039] After the batch granulation operation is completed, in order to prevent the residual material from deteriorating and affecting the purity of the next batch of products, the fan 22 in the top connecting box 21 of the support box 20 is started. The fan 22 draws in the outside air, filters out dust and impurities through the top filter screen 23, and blows high-pressure air into the cavity of the support box 20 to preliminarily clean the residual particles. Then, clean water is injected into the support box 20 through the connecting pipe 27.

[0040] The cleaning water forms a flushing flow inside the support box 20, soaking and dissolving the sticky material remaining on the cavity wall. The fixing plate 25 inside the support box 20 isolates the space where the hydraulic push rod 24 is located from the water circuit, preventing electrical components from being damaged by moisture. Finally, the cleaning water carrying impurities is discharged from the discharge port 28, realizing the automated cleaning of the support box 20.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An animal medicine granule wet granulation drying all-in-one machine, comprising: Support plate (2), connecting tank (1) fixedly connected to the top of support plate (2), and support legs (3) fixedly connected to the four corners of the bottom of support plate (2); A spray pipe (5) is fixedly connected to the top of the connecting tank (1), and a feed inlet (4) is fixedly connected to one side of the top of the connecting tank (1); an electric heating wire (6) is fixedly connected to the inner wall of the connecting tank (1) in a spiral shape. A motor (7) is fixedly connected to the bottom of the connecting tank (1). The output shaft of the motor (7) passes through the bottom of the connecting tank (1) and is fixedly connected to a fan blade (8) located inside the connecting tank (1). Its features are: The bottom side wall of the connecting tank (1) has an opening (9); A support box (20) is fixedly connected to the top of the support plate (2). The support box (20) is located on one side of the connecting tank (1) and the inside of the support box (20) is connected to the opening (9). A hydraulic push rod (24) is fixedly connected to the inner wall of the support box (20). The output end of the hydraulic push rod (24) extends into the inside of the support box (20) and is fixedly connected to a rubber block (26). The rubber block (26) is sealed to the opening (9). The bottom of the support box (20) is connected to the discharge port (28).

2. The integrated wet granulation and drying machine for animal drug granules according to claim 1, characterized in that, The top of the support box (20) is connected to the connecting box (21), and the fan (22) is fixedly connected inside the connecting box (21). The filter screen (23) is fixedly connected at the top opening of the connecting box (21).

3. The integrated wet granulation and drying machine for animal drug granules according to claim 1, characterized in that, The side wall of the support box (20) is connected to a connecting pipe (27), one end of which extends into the inside of the support box (20); a fixed plate (25) is fixedly connected inside the support box (20), and a hydraulic push rod (24) passes through the fixed plate (25). The fixed plate (25) divides the inside of the support box (20) into an installation cavity and a discharge cavity. The main body of the hydraulic push rod (24) is located in the installation cavity, and the rubber block (26) is located in the discharge cavity.

4. The integrated wet granulation and drying machine for animal drug granules according to claim 1, characterized in that, An electric push rod (10) is fixedly connected to the outer wall of the support leg (3), and a slide rail (19) is provided on the inner wall of the support leg (3). A rack (11) is slidably connected inside the slide rail (19), and the output end of the electric push rod (10) is fixedly connected to the top of the rack (11).

5. The integrated wet granulation and drying machine for animal drug granules according to claim 4, characterized in that, The side wall of the support leg (3) is rotatably connected to a rotating rod (14). One end of the rotating rod (14) is fixedly sleeved with a gear (12). The gear (12) meshes with the rack (11). The other end of the rotating rod (14) is fixedly connected to a first support column (13).

6. The integrated wet granulation and drying machine for animal drug granules according to claim 4, characterized in that, A limiting block (18) is fixedly connected to the inner wall of the bottom end of the slide rail (19), and the limiting block (18) is located below the moving path of the rack (11).

7. The integrated wet granulation and drying machine for animal drug granules according to claim 5, characterized in that, The second support column (15) is slidably inserted inside the first support column (13).

8. The integrated wet granulation and drying machine for animal drug granules according to claim 7, characterized in that, The outer walls of the first support column (13) and the second support column (15) are provided with several screw holes (17). The first support column (13) and the second support column (15) are fixedly connected by bolts (16) passing through the aligned screw holes (17).

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