Washing and drying integrated device for laboratory instruments
By introducing a fixed component and a hot air blower into the laboratory instrument washing and drying device, the problems of easy movement and uneven heating of the vessels during the drying process have been solved, improving drying efficiency and the cleanliness of the vessels, while simplifying the replacement and maintenance process of the filter plates.
Patent Information
- Application Number
- CN202520329372.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-27
AI Technical Summary
In existing laboratory instrument washing and drying devices, the glassware is prone to movement during the drying process, resulting in uneven heating, affecting drying efficiency and potentially causing damage to the glassware.
The fixed components include a bracket and an arc plate. The elastic deformation of the limit springs ensures the stable fixation of the container. Combined with the design of the movable plate and guide rail, the container's position is kept stable during the drying process. The hot air blower design uses an isolation mesh and filter plate to achieve air filtration and uniform hot air delivery. The quick-replacement structure of the filter plate simplifies the maintenance process through the cooperation of the movable column and the return spring.
This method ensures stable positioning of the containers during the drying process, uniform heat transfer, improved drying efficiency, and guarantees the cleanliness of the containers and ease of equipment maintenance.
Smart Images
Figure CN223862490U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of instrument cleaning technology, and in particular to an integrated device for washing and drying laboratory instruments. Background Technology
[0002] A laboratory instrument washing and drying integrated device is an indispensable piece of equipment in modern laboratories. It is mainly used for cleaning and drying laboratory instruments such as test tubes, beakers, and petri dishes. With the increase in laboratory workload and the improvement of experimental accuracy requirements, traditional manual washing and drying methods can no longer meet the needs of high efficiency and cleanliness. Therefore, automated and integrated washing and drying devices have emerged. By integrating washing and drying functions, these devices not only improve work efficiency but also ensure the cleanliness and drying effect of the instruments. They are widely used in laboratories in the fields of chemistry, biology, and medicine.
[0003] Existing laboratory instrument washing and drying devices typically employ mechanical structures and hot air circulation technology to achieve cleaning and drying functions. The cleaning section often relies on high-pressure spray systems or ultrasonic cleaning technology, using water flow or sound wave vibration to remove residues from the surface of the instruments. The drying section mainly relies on hot air circulation systems, using heating elements to generate hot air, which is then blown evenly onto the surface of the instruments by a fan, thereby achieving rapid drying. The combination of these technologies makes the cleaning and drying process of laboratory instruments more efficient and automated.
[0004] However, existing technologies have a significant problem in the drying process of glassware: the glassware is prone to moving during the drying process, resulting in uneven heating and affecting drying efficiency. Specifically, because the glassware is not securely fixed in the drying chamber, hot air cannot be evenly transferred to the surface of each glassware. Some glassware will not be completely dried due to uneven heating, and glassware may even tip over or collide. This not only reduces drying efficiency but also damages the glassware. To address this issue, a laboratory instrument washing and drying integrated device is proposed. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides an integrated washing and drying device for laboratory instruments, which aims to improve the problems of easy movement and uneven heating of vessels during the drying process in the prior art.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A laboratory instrument washing and drying integrated device includes a base, and a washing and drying assembly is provided on the top of the base. The assembly is used to clean laboratory instruments and utensils.
[0008] The washing and drying assembly includes a washing tank and a drying chamber. The washing tank is located on the top of the base, and the drying chamber is located on the side of the washing tank. The bottom of the drying chamber is fixedly connected to the top of the base. A guide rail is fixedly connected to the bottom of the inner wall of the drying chamber. Movable plates are provided on both the left and right sides of the guide rail. The inside of the side of the movable plates is slidably connected to the side wall of the guide rail. Multiple fixing components are provided on the side wall of the movable plates for fixing the containers.
[0009] As a further description of the above technical solution:
[0010] The fixing assembly includes multiple brackets arranged in an array inside the side wall of the movable plate. Each bracket has a fixed seat fixedly connected to its top side wall. Each fixed seat has a symmetrical arc-shaped plate rotatably connected inside. Each arc-shaped plate has a connecting plate fixedly connected to its outer wall. Each connecting plate has a limit spring at its bottom. One end of each limit spring is fixedly connected to the bottom of the connecting plate, and the other end of each limit spring is fixedly connected to the top of the bracket. Each bracket has a placement groove at its bottom.
[0011] As a further description of the above technical solution:
[0012] A control console is fixedly connected to the top of the base, and the control console is located on the side of the cleaning tank. A drain outlet is provided at the bottom of the inner wall of the cleaning tank.
[0013] As a further description of the above technical solution:
[0014] The drying oven has a door that is rotatably connected to the side of the oven. Multiple drainage grooves are provided at the bottom of the inner wall of the drying oven. The drainage grooves are arranged in an array. A partition is fixedly connected to the inner wall of the drying oven. The partition is located above the fixed assembly. A hot air blower is fixedly connected to the top of the drying oven.
[0015] As a further description of the above technical solution:
[0016] The top of the hot air blower is fixedly connected with symmetrical isolation nets on both sides. Filter plates are provided below each isolation net. The outer walls of the filter plates are slidably connected to the inside of the hot air blower. Handles are fixedly connected to the side walls of each filter plate. Inlet fans are provided below each filter plate. The outer walls of the inlet fans are fixedly connected to the inside of the hot air blower.
[0017] As a further description of the above technical solution:
[0018] The hot air blower has a movable column slidably connected inside, which is located between the isolation nets, and a limit plate is fixedly connected to the outer wall of the movable column.
[0019] As a further description of the above technical solution:
[0020] The outer wall of the movable column is provided with a receiving groove, which is located below the limiting plate. A return spring is sleeved on the outer wall of the movable column. One end of the return spring is fixedly connected to the inside of the hot air blower, and the other end of the return spring is fixedly connected to the top of the limiting plate.
[0021] As a further description of the above technical solution:
[0022] Movable columns 2 are provided on both the left and right sides of the outer wall of movable column 1. The outer walls of movable columns 2 are slidably connected to the inside of the hot air blower. Limiting plates 2 are fixedly connected to the outer walls of movable columns 2. Reset springs 2 are sleeved on the outer walls of movable columns 2. One end of each reset spring 2 is fixedly connected to the inside of the hot air blower, and the other end of each reset spring 2 is fixedly connected to the side wall of the limiting plates 2.
[0023] This utility model has the following beneficial effects:
[0024] 1. In this utility model, after cleaning, experimental vessels are placed in the drying oven, with larger ones placed on the partition. The movable plate is manually pulled out, and the connecting plates on both sides of the top of the support are bent to rotate the arc plate and compress the limiting spring. Test tubes and other vessels are placed between the arc plates, and the limiting spring's counter-force is used to reset the arc plate and fix the vessels. This achieves the effect of stable position of the vessels during the drying process and uniform heat transfer, solving the problems of easy movement and uneven heating of vessels during the drying process, and improving drying efficiency.
[0025] 2. In this utility model, pulling the first movable column upward causes the limiting plate to compress the first return spring, and at the same time, the receiving groove moves upward. The movement of the first movable column causes the second movable column to lose the lateral squeezing force. Under the action of the second return spring, one end of the second movable column enters the inner wall of the receiving groove, and the other end disengages from the locking hole on the side of the filter plate, thus unlocking the filter plate. Subsequently, the filter plate can be pulled out by the handle for cleaning or replacement, achieving the effect of quick replacement of the filter plate. This solves the problem of cumbersome filter plate replacement and the impact on equipment cleanliness, and improves maintenance efficiency. Attached Figure Description
[0026] Figure 1 This is a perspective view of a laboratory instrument washing and drying integrated device proposed in this utility model;
[0027] Figure 2 This is a schematic diagram of the drying box structure of a laboratory instrument washing and drying integrated device proposed in this utility model;
[0028] Figure 3 This is a schematic diagram of the hot air blower structure of a laboratory instrument washing and drying integrated device proposed in this utility model.
[0029] Legend:
[0030] 1. Base; 2. Control console; 3. Cleaning tank; 4. Drain; 5. Drying oven; 6. Door; 7. Hot air blower; 8. Partition; 9. Drainage trough; 10. Guide rail; 11. Movable plate; 12. Bracket; 13. Fixed base; 14. Arc plate; 15. Connecting plate; 16. Limiting spring; 17. Placement slot; 18. Isolation net; 19. Filter plate; 20. Inlet fan; 21. Handle; 22. Movable column one; 23. Return spring one; 24. Limiting plate one; 25. Receiving slot; 26. Movable column two; 27. Limiting plate two; 28. Return spring two. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0032] Reference Figure 1 and Figure 2 The present invention provides an embodiment of a laboratory instrument washing and drying integrated device, including a base 1, which is made of stainless steel and has good corrosion resistance and can stably support the weight of the entire device. A washing and drying assembly is provided on the top of the base 1, which is used to clean laboratory instruments and utensils.
[0033] The washing and drying assembly includes a washing tank 3 and a drying chamber 5. The washing tank 3 is located on top of the base 1 and is made of acid and alkali resistant plastic, which will not chemically react with the cleaning solution. An ultrasonic device is installed at its bottom to hold the cleaning solution and provide a cleaning space for laboratory instruments and glassware. The drying chamber 5 is located beside the washing tank 3 and is fixedly connected to the top of the base 1. The drying chamber 5 is made of cold-rolled steel plate with a rust-proof paint finish, providing good heat insulation and heat preservation properties. Its function is to dry the cleaned glassware. A guide rail 10 is fixedly connected to the bottom of the inner wall of the drying chamber 5. The guide rail 10 is made of aluminum alloy with a smooth surface to effectively reduce friction. Its function is to provide sliding guidance for the movable plate 11. Movable plates 11 are provided on both the left and right sides. These plates are made of engineering plastic and serve to fix multiple supports 12. The inner sides of each movable plate 11 are slidably connected to the sidewalls of the guide rail 10. Multiple fixing components are provided on the sidewalls of the movable plates 11 to secure the vessels. These components include multiple supports 12, which are made of stainless steel, making them sturdy and durable. Their function is to support and install other fixing components, ensuring the stability of the test tubes and other vessels. The supports 12 are arranged in an array inside the sidewalls of the movable plates 11. Fixing seats 13 are fixedly connected to the top sidewalls of each support 12. Symmetrical arc-shaped plates 14 are rotatably connected inside each fixing seat 13. These arc-shaped plates 14 are made of silicone, which is soft and elastic, effectively protecting the vessel. The surface of the vessel is not scratched. Connecting plates 15 are fixedly connected to the outer wall of the arc-shaped plate 14. Limiting springs 16 are installed at the bottom of each connecting plate 15. These springs adjust and fix the position of the arc-shaped plate 14 through their elastic deformation. One end of each limiting spring 16 is fixedly connected to the bottom of the connecting plate 15, and the other end is fixedly connected to the top of the bracket 12. Placement slots 17 are provided at the bottom of each bracket 12. A control console 2 is fixedly connected to the top of the base 1. The control console 2 is the control center of the entire device. Through its internal circuitry and control system, the user can operate functions such as starting, stopping, and adjusting cleaning and drying parameters. The control console 2 is located on the side of the cleaning tank 3. A drain outlet 4 is provided at the bottom of the inner wall of the cleaning tank 3 for discharging wastewater after cleaning, ensuring... The liquid in the washing tank 3 can be drained in a timely manner. A door 6 is rotatably connected to the side of the drying oven 5. The door 6 is made of double-layered glass with insulation material in between, allowing observation of the drying process while effectively preventing heat loss. Multiple drainage channels 9 are located at the bottom of the inner wall of the drying oven 5 to collect and drain condensate generated during the drying process, preventing water accumulation from affecting the drying effect. The drainage channels 9 are arranged in an array. A partition 8 is fixedly connected to the inner wall of the drying oven 5. The partition 8 is made of stainless steel and has a certain load-bearing capacity, used for placing larger containers. The partition 8 is located above the fixed components. A hot air blower 7 is fixedly connected to the top of the drying oven 5. The hot air blower 7 has a metal outer shell and contains a motor, fan, heating element, etc., its function is to provide hot air to the drying oven 5.This allows for the drying of the containers.
[0034] Specifically, when using this integrated laboratory instrument washing and drying device, the user first places the laboratory glassware inside the washing tank 3. Then, the user starts the device inside the washing tank 3 to wash the glassware using the control panel 2. After washing, the user manually holds the handle of the door 6 and turns it outward to open the door. The user then places the washed glassware into the drying oven 5, placing larger glassware on top of the partition 8. After placing the glassware, the user manually holds the groove on the edge of the movable plate 11 and pulls the movable plate 11 outward along the guide rail 10. Then, the user manually moves the connecting plates 15 on both sides of the top of the support 12 outward. This displacement of the connecting plates 15 causes the arc-shaped plate 14, which is fixedly connected to it, to rotate about the rotational connection point between the fixed base 13 and the arc-shaped plate 14. Simultaneously, it compresses the limiting spring 16. When the arc-shaped plate 14 rotates to a certain angle, the user... Place test tubes and other glassware between the plates, then loosen the connecting plate 15. Under the counter-pushing force of the limiting spring 16, the limiting spring 16 returns from its compressed state to its natural state, pushing the connecting plate 15 and the arc plate 14 back to their original positions, thus securing the test tubes and other glassware. Then, the user pushes the movable plate 11 horizontally inward along the guide rail 10 into the drying oven 5 and closes the door 6 of the drying oven 5. At this time, the motor inside the hot air blower 7 starts, driving the inlet fan 20 to rotate at high speed, drawing in external air into the hot air blower 7. The air first passes through the isolation net 18, which blocks larger dust and impurities, and then passes through the filter core plate 19 to filter out small particles and impurities in the air, ensuring that the air entering the drying oven 5 is clean. The air drawn into the hot air blower 7 is heated by the heating element and finally discharged into the drying oven 5 through the air outlet to dry the cleaned glassware, thus achieving the drying treatment of laboratory instruments and glassware.
[0035] Reference Figure 3The top of the hot air blower 7 is fixedly connected with symmetrical isolation nets 18. The isolation nets 18 are made of woven stainless steel wire and their function is to perform preliminary filtration of the air entering the hot air blower 7 during operation, blocking larger dust, debris, and other foreign objects. Below each isolation net 18 is a filter plate 19. The main material of the filter plate 19 is polypropylene, and its surface is coated with high-efficiency filter fiber material, which can effectively filter small particulate impurities, bacteria, and some harmful gases in the air. The outer walls of the filter plates 19 are slidably connected to... Inside the hot air blower 7, this connection method ensures the stability of the filter plate 19 installation and facilitates its disassembly and replacement during maintenance. Handles 21 are fixedly connected to the side walls of each filter plate 19, and an inlet fan 20 is installed below each filter plate 19. The outer wall of the inlet fan 20 is fixedly connected inside the hot air blower 7. Driven by a motor, it rotates at high speed, generating strong suction to draw external air into the hot air blower 7, providing a sufficient air source for subsequent air heating and drying of utensils. Movable columns 22 and 23 are slidably connected inside the hot air blower 7. Located between the isolation nets 18, the outer wall of the movable column 22 is fixedly connected to a limiting plate 24. Its function is to limit the movement range of the movable column 22, preventing it from moving excessively and deviating from its normal working position. It also cooperates with the return spring 23 to achieve the reset control of the movable column 22. The outer wall of the movable column 22 has a receiving groove 25 to accommodate one end of the movable column 26 when it is to be unlocked, thereby realizing the unlocking operation of the filter plate 19. The receiving groove 25 is located below the limiting plate 24, and the outer wall of the movable column 22 is fitted with a reset plate. Spring 23, one end of the return spring 23 is fixedly connected to the inside of the hot air blower 7, and the other end of the return spring 23 is fixedly connected to the top of the limiting plate 24. Movable columns 26 are provided on both the left and right sides of the outer wall of the movable column 22. The outer walls of the movable columns 26 are slidably connected to the inside of the hot air blower 7. The outer walls of the movable columns 26 are fixedly connected to the limiting plate 27. The outer walls of the movable columns 26 are fitted with return springs 28. One end of the return spring 28 is fixedly connected to the inside of the hot air blower 7. The other end of the return spring 28 is fixedly connected to the side wall of the limiting plate 27.
[0036] Specifically, when maintenance is required, the user first grasps the protruding plate at the top of the movable column 22 and then applies upward pulling force. The movable column 22 begins to move upward under this pulling force. Simultaneously, the upward movement of the movable column 22 causes the limiting plate 24 on its outer wall to move upward. As the limiting plate 24 moves upward, the return spring 23 is compressed by the limiting plate 24, converting the external force into stored elastic potential energy. At the same time, the upward movement of the movable column 22 also causes the receiving groove 25 on its outer wall to move upward synchronously. Before the movable column 22 moves upward, its outer wall exerts a lateral squeezing force on the movable column 26, keeping it in a specific position. After the movable column 22 moves upward, the movable column 26, which was previously squeezed by its outer wall, loses the lateral squeezing force. At this time, the return spring 28, which is fitted on the outer wall of the movable column 26, having previously been compressed and stored elastic potential energy, begins to release its elasticity after losing the squeezing force of the movable column 22. Potential energy propels the limiting plate 27 to move inward along the guide structure inside the hot air blower 7. The movement of the limiting plate 27 also drives the movable column 26 to move together, so that one end of the movable column 26 gradually enters the inner wall of the receiving groove 25. As the movable column 26 moves, its other end gradually disengages from the locking hole on the side of the filter plate 19, thus completing the unlocking operation of the filter plate 19. After unlocking, the user can reach out and grasp the handle 21 fixedly connected to the side wall of the filter plate 19, and then pull the handle 21 horizontally outward along the slide rail structure inside the hot air blower 7. Driven by the handle 21, the filter plate 19 moves outward along the slide rail, thereby pulling the filter plate 19 out of the hot air blower 7. At this time, the user can clean or replace the filter plate 19. By cleaning or replacing the filter plate 19 in a timely manner, the air drawn in by the hot air blower 7 can always maintain a high level of cleanliness, thereby providing a clean drying environment for the dried utensils and improving the cleanliness of the dried utensils.
[0037] Working Principle: When using this integrated laboratory instrument washing and drying device, the user first places the laboratory glassware in the washing tank 3, then uses the control panel 2 to start the internal device to clean the glassware. After cleaning, the user opens the door 6 and places test tubes and other glassware into the drying chamber 5, placing larger glassware on top of the partition 8. The user manually pulls out the movable plate 11, then bends the connecting plates 15 on both sides of the top of the support 12. The displacement of the connecting plate 15 causes the arc plate 14 to rotate, and also compresses the limiting spring 16. When the arc plate 14 rotates to a certain angle, the user places test tubes and other glassware between it. Then, under the counter-pushing force of the limiting spring 16, the arc plate 14 is pushed back to its original position, thus fixing the test tubes and other glassware. This ensures that the glassware is relatively stable after being fixed, and that heat transfer is more uniform during the drying process. Then, the drying chamber 5 is closed. At this time, the intake fan 20 inside the hot air blower 7 draws in outside air, and the air... The air first passes through the isolation net 18 and then through the filter core plate 19. After being drawn into the hot air blower 7 and heated, it is finally discharged into the drying chamber 5 to dry the cleaned utensils. When maintenance is required, the user first pulls the movable column 22 upward. The upward movement of the movable column 22 causes the limiting plate 24 on its outer wall to compress the return spring 23. At the same time, it also causes the receiving groove 25 to move upward. The upward movement of the movable column 22 causes the movable column 26, which was originally squeezed by its outer wall, to lose the lateral squeezing force. Under the push of the return spring 28, the limiting plate 27 moves inward, and at the same time, one end of the movable column 26 enters the inner wall of the receiving groove 25. Meanwhile, the other end of the movable column 26 disengages from the locking hole on the side of the filter core plate 19, thus unlocking the filter core plate 19. Then, the user can pull out the filter core plate 19 through the handle 21 to clean or replace it, thereby achieving the effect of quickly replacing the filter core plate 19 and improving the cleanliness of the dried utensils.
[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A laboratory instrument washing and drying integrated device, comprising a base (1), characterized in that: The base (1) is provided with a washing and drying assembly on top, which is used to clean laboratory instruments and utensils; The washing and drying assembly includes a washing tank (3) and a drying box (5). The washing tank (3) is located on the top of the base (1). The drying box (5) is located on the side of the washing tank (3). The bottom of the drying box (5) is fixedly connected to the top of the base (1). A guide rail (10) is fixedly connected to the bottom of the inner wall of the drying box (5). Movable plates (11) are provided on both the left and right sides of the guide rail (10). The inner side of the movable plates (11) is slidably connected to the side wall of the guide rail (10). Multiple fixing components are provided on the side wall of the movable plates (11). The fixing components are used to fix the utensils.
2. The integrated laboratory instrument washing and drying device according to claim 1, characterized in that: The fixing assembly includes multiple brackets (12), which are arranged in an array inside the side wall of the movable plate (11). Each bracket (12) has a fixed seat (13) fixedly connected to its top side wall. Each fixed seat (13) has a left-right symmetrical arc plate (14) rotatably connected inside its interior. Each arc plate (14) has a fixed connecting plate (15) fixedly connected to its outer wall. Each connecting plate (15) has a limit spring (16) at its bottom. One end of each limit spring (16) is fixedly connected to the bottom of the connecting plate (15), and the other end of each limit spring (16) is fixedly connected to the top of the bracket (12). Each bracket (12) has a placement groove (17) at its bottom.
3. The integrated laboratory instrument washing and drying device according to claim 1, characterized in that: The base (1) is fixedly connected to a control console (2), which is located on the side of the cleaning pool (3). A drain outlet (4) is provided at the bottom of the inner wall of the cleaning pool (3).
4. The integrated laboratory instrument washing and drying device according to claim 1, characterized in that: The drying box (5) has a door (6) rotatably connected to the inside of its side. Multiple drainage grooves (9) are provided at the bottom of the inner wall of the drying box (5). The drainage grooves (9) are arranged in an array. A partition (8) is fixedly connected to the inner wall of the drying box (5). The partition (8) is located above the fixed component. A hot air blower (7) is fixedly connected to the top of the drying box (5).
5. The integrated laboratory instrument washing and drying device according to claim 4, characterized in that: The hot air blower (7) is fixedly connected to the top of a symmetrical isolation net (18). A filter plate (19) is provided below each of the isolation nets (18). The outer wall of the filter plate (19) is slidably connected to the inside of the hot air blower (7). A handle (21) is fixedly connected to the side wall of each filter plate (19). An inlet fan (20) is provided below each filter plate (19). The outer wall of the inlet fan (20) is fixedly connected to the inside of the hot air blower (7).
6. The integrated laboratory instrument washing and drying device according to claim 5, characterized in that: The hot air blower (7) has a movable column (22) slidably connected inside. The movable column (22) is located between the isolation nets (18). The outer wall of the movable column (22) is fixedly connected to a limit plate (24).
7. The integrated laboratory instrument washing and drying device according to claim 6, characterized in that: The outer wall of the movable column (22) is provided with a receiving groove (25), which is located below the limiting plate (24). The outer wall of the movable column (22) is fitted with a reset spring (23), one end of which is fixedly connected to the inside of the hot air blower (7), and the other end of which is fixedly connected to the top of the limiting plate (24).
8. The integrated laboratory instrument washing and drying device according to claim 7, characterized in that: Movable columns 2 (26) are provided on both the left and right sides of the outer wall of the movable column 1 (22). The outer walls of the movable columns 2 (26) are slidably connected to the inside of the hot air blower (7). The outer walls of the movable columns 2 (26) are fixedly connected to the limit plate 2 (27). The outer walls of the movable columns 2 (26) are fitted with a reset spring 2 (28). One end of the reset spring 2 (28) is fixedly connected to the inside of the hot air blower (7), and the other end of the reset spring 2 (28) is fixedly connected to the side wall of the limit plate 2 (27).