Numerical control machine tool cooling device based on artificial intelligence

Abstract

The invention belongs to the technical field of numerical control machine tool cooling, and discloses a numerical control machine tool cooling device based on artificial intelligence, the numerical control machine tool cooling device comprises a numerical control machine tool, the inner side of the numerical control machine tool is provided with an omni-directional adjusting assembly, the omni-directional adjusting assembly comprises a fixing frame, and the inner side of the fixing frame is fixedly provided with a fixing gear ring; the omni-directional adjusting assembly comprises a sliding frame, a double-shaft motor is installed in the middle of the sliding frame, a driving gear is fixedly installed at the output end of the double-shaft motor, and the driving gear is arranged on the inner side of the fixed gear ring in a meshed mode. The effect of changing the angle and the position of the spray head in all directions through an adjusting mode is benefited, adjustment is facilitated to adapt to different requirements, the flexibility of the cooling angle is greatly improved, so that different requirements are met, the cooling efficiency can be effectively improved, and the problem that cooling is not in place is solved.

Description

Technical Field

[0001] This invention belongs to the field of CNC machine tool cooling technology, specifically a CNC machine tool cooling device based on artificial intelligence. Background Technology

[0002] As the core equipment of the intelligent manufacturing system, intelligent machine tools, by integrating sensing, data analysis, and autonomous decision-making technologies, can deeply perceive the dynamic changes of the entire manufacturing process. They can not only monitor key parameters such as spindle speed, cutting force, and machining accuracy in real time, but also diagnose potential problems such as tool wear and vibration deviation through built-in algorithms, and automatically trigger compensation and correction mechanisms. This provides a closed-loop solution for maximizing production efficiency and optimizing energy consumption. In modern precision machining scenarios, machine tools generate a lot of heat during long-term high-speed cutting and heavy-load operation. If heat accumulates, it will cause thermal deformation of machine tool components, drift in machining accuracy, and even shorten the service life of core components. Therefore, timed cooling has become a necessary link to ensure machining stability. Although current intelligent CNC machine tools have achieved automated control of the machining process, their supporting cooling structures still have obvious shortcomings: most rely on manually setting the cooling cycle or manually starting and stopping the cooling system, and cannot adaptively adjust the cooling flow and cooling timing according to the machine tool's real-time temperature data and machining conditions. This results in a mismatch between cooling efficiency and actual needs, which may lead to energy waste due to over-cooling or affect machining quality due to untimely cooling, seriously restricting the implementation efficiency of full-process automation of intelligent machine tools.

[0003] For example, the invention disclosed in CN116511987A discloses a CNC machine tool cooling device based on artificial intelligence. It includes a base plate with the machine tool attached to its upper end, a protective shell fixedly connected to the upper end of the base plate, a U-shaped cooling groove on the inner wall of the protective shell, symmetrically arranged cutting tools fixedly connected to both sides of the protective shell via the machine tool, a first sliding groove on the inner wall of the rear end of the protective shell, and a through-hole on the upper side of the protective shell away from the cooling groove. When the temperature sensor detects overheating, a control terminal can wirelessly activate a drive motor and a negative pressure water pump to quickly extract coolant. The coolant is then rapidly sprayed onto different positions of the machine tool cutting tools, resulting in fast cooling. Simultaneously, the bevel gear drives a threaded fan blade to transport the coolant into the cooling groove, providing overall cooling to the machine tool's exterior. This device offers a wide cooling range, intelligent and automatic cooling, and high safety.

[0004] In existing technologies, the coolant can be quickly sprayed and cooled at different positions of the machine tool by adjusting the position of the nozzle. However, the position of the existing nozzle cannot be flexibly adjusted in an arc shape, which makes it impossible to accurately spray coolant for different processing conditions. The adjustment angle has certain limitations. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a CNC machine tool cooling device based on artificial intelligence. This device solves the problem that existing nozzle positions cannot be flexibly adjusted in an arc shape, resulting in the inability to accurately spray coolant for cooling under different processing conditions, and the adjustment angle has certain limitations.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a CNC machine tool cooling device based on artificial intelligence, comprising a CNC machine tool, wherein an all-around adjustment component is provided on the inner side of the CNC machine tool;

[0007] The omnidirectional adjustment component includes a fixed frame, and a fixed gear ring is fixedly installed on the inner side of the fixed frame. The omnidirectional adjustment component also includes a sliding frame, a dual-axis motor is installed in the middle of the sliding frame, and a drive gear is fixedly installed at the output end of the dual-axis motor. The drive gear is meshed with the inner side of the fixed gear ring. A connecting bracket is installed on the outer side of the dual-axis motor and is fixedly installed on the inner side of the sliding frame. Flexible barrier plates are installed at both ends of the connecting bracket and are movably located inside the fixed frame.

[0008] Preferably, limiting rings are installed on both sides inside the fixed frame, the flexible barrier is slidably disposed between the fixed frame and the limiting rings, and limiting arc strips are fixedly installed on the front and back of the fixed frame.

[0009] Preferably, the sliding frame has limiting arc grooves on its front and back sides, the limiting arc grooves are slidably disposed on the outside of the limiting arc strip, and the sliding frame is rotatably disposed on the outside of the sliding frame with a linkage nozzle adjustment assembly.

[0010] Preferably, the linkage nozzle adjustment assembly includes two sets of rotating brackets, and the rotating brackets are rotatably connected to the sliding frame through bearings. An input pipe is installed on the side of the rotating bracket away from the sliding frame, and a fixed gear is fixedly installed on the outer side of the rotating bracket away from the sliding frame.

[0011] Preferably, the linkage nozzle adjustment assembly includes a drive motor, three sets of connecting rods are mounted on the back of the drive motor, and the connecting rods are fixedly mounted on one side of the sliding frame. An adjustment gear is fixedly mounted on the output end of the drive motor, and the adjustment gear is meshed on one side of the adjustment gear.

[0012] Preferably, a transmission pipe is installed at the bottom of the rotating bracket, and a limiting pipe is installed on the side of the two sets of transmission pipes away from the rotating bracket, and a limiting groove is formed at the bottom of the limiting pipe.

[0013] Preferably, a movable tube is slidably arranged in the middle of the limiting tube, and a sliding column is installed at the bottom of the movable tube. The sliding column is slidably arranged inside the limiting groove. Four sets of flow guides are opened at the top of the movable tube, and a cooling nozzle is embedded on the side of the movable tube away from the flow guides.

[0014] Preferably, a movable door is provided on one side of the CNC machine tool, a collection and transmission module is provided at the bottom of the CNC machine tool, and a maintenance cover plate is installed on the side of the CNC machine tool away from the movable door by bolts.

[0015] Preferably, a control panel is fixedly installed on the top of the fixed frame on the side away from the movable door, and an intelligent detector is provided on the front of the control panel. A sliding plate is fixedly installed on the top of the control panel, and an adjusting screw is installed in the middle of the sliding plate. An adjusting motor is fixedly installed at the input end of the adjusting screw.

[0016] Preferably, a limit frame is bolted to the back of the adjusting motor, and the limit frame is bolted to the top of the CNC machine tool. Two sets of limit guide rods are installed on the inner side of the limit frame, and the limit guide rods are fixedly installed on the inner side of the sliding plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention, through the combination of an all-around adjustment component and a sliding plate, facilitates the omnidirectional adjustment of the nozzle angle and position, allowing for easy adaptation to different needs. Controlling the output of the dual-axis motor rotates two sets of drive gears, which remain engaged with the fixed gear ring throughout the rotation. Since the fixed gear ring is in a fixed position, the rotation of the drive gears causes the sliding frame to slide along the outer side of the fixed frame. During adjustment, the flexible barrier plate can be pulled along the fixed frame and the limiting ring via the connecting bracket, allowing for flexible adjustment to change the approximate position of the nozzle. Further adjustment by the drive motor, which rotates the adjustment gears, engages the fixed gears and the rotating bracket to change the nozzle angle again. This significantly increases the flexibility of the cooling angle, adapting to different needs and effectively improving cooling efficiency, avoiding inadequate cooling.

[0019] This invention utilizes a combination of a linkage nozzle adjustment component and a sliding plate to facilitate the linkage control of nozzle types through the lateral movement of the sliding plate. During the lateral movement of the sliding plate, the squeezing block contacts and pushes the movable tube structure, causing it to slide laterally along the inner side of the limiting tube. During the sliding process, the sliding column stably adjusts laterally along the limiting groove. When adjusting, the opening in the area corresponding to the limiting tube and the transmission tube exposes the nozzle structure, and the internal water flow is sprayed out through the corresponding nozzle. The nozzle type can be changed flexibly to adapt to different cooling requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the limiting frame of the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the omnidirectional adjustment component of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0024] Figure 5 This is a schematic diagram of the linkage nozzle adjustment assembly of the present invention;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the limiting tube of the present invention.

[0026] In the diagram: 100, CNC machine tool; 101, movable door; 102, collection and transmission module; 103, maintenance cover plate;

[0027] 200. Control console; 201. Limiting frame; 202. Adjusting motor; 203. Adjusting screw; 204. Limiting guide rod; 205. Sliding plate; 206. Intelligent detector; 207. Extrusion block;

[0028] 001. All-around adjustment component; 300. Fixed toothed ring; 301. Fixed frame; 302. Limiting ring; 303. Limiting arc strip;

[0029] 400. Flexible barrier sheet; 401. Sliding frame; 402. Dual-axis motor; 403. Connecting bracket; 404. Drive gear; 405. Limiting arc groove;

[0030] 002. Linked nozzle adjustment assembly; 500. Movable tube; 501. Rotating bracket; 502. Input tube; 503. Fixed gear; 504. Connecting rod; 505. Drive motor; 506. Adjusting gear; 507. Transmission tube; 508. Limiting tube; 509. Limiting slide groove; 510. Flow guide; 511. Cooling nozzle; 512. Sliding column. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 6 As shown, the present invention provides a CNC machine tool cooling device based on artificial intelligence, including a CNC machine tool 100, and an all-around adjustment component 001 is provided on the inner side of the CNC machine tool 100;

[0033] The omnidirectional adjustment component 001 includes a fixed frame 301, and a fixed gear ring 300 is fixedly installed on the inner side of the fixed frame 301. The omnidirectional adjustment component 001 includes a sliding frame 401, a dual-axis motor 402 is installed in the middle of the sliding frame 401, and a drive gear 404 is fixedly installed at the output end of the dual-axis motor 402. The drive gear 404 is meshed on the inner side of the fixed gear ring 300. A connecting bracket 403 is installed on the outer side of the dual-axis motor 402 and is fixedly installed on the inner side of the sliding frame 401. Flexible barrier plates 400 are installed at both ends of the connecting bracket 403 and are movably located on the inner side of the fixed frame 301.

[0034] Limiting rings 302 are installed on both sides inside the fixed frame 301. Flexible barrier sheet 400 is slidably disposed between the fixed frame 301 and the limiting rings 302. Limiting arc strips 303 are fixedly installed on the front and back of the fixed frame 301.

[0035] Limiting arc grooves 405 are provided on the front and back sides of the inner side of the sliding frame 401. The limiting arc grooves 405 are slidably disposed on the outside of the limiting arc strip 303. The outer side of the sliding frame 401 is rotatably disposed with a linkage nozzle adjustment assembly 002.

[0036] The above scheme employs the following design: the fixed frame 301 has an arc-shaped structure with an opening at the bottom to facilitate adjustment of the sliding frame 401; the fixed gear ring 300 provides restraint; the easily rotating drive gear 404 drives the sliding frame 401 to slide along the fixed frame 301 in an arc shape; the dual-axis motor 402 provides rotational kinetic energy to the drive gear 404; and the two sets of drive gears 404 mesh with the fixed gear ring 300 to adjust the position by rotation; the connecting bracket 403 connects the dual-axis motor 402 to the sliding frame 401, thereby ensuring the stability of the sliding adjustment; and the flexible barrier plate 400 is connected to the connecting bracket 403 at both ends. After connection, the 03 is in a ring state, and the flexible barrier 400 is made of flexible material. Several sets of rod structures are provided in the middle for connection. The rods are inserted between the fixed frame 301 and the limiting ring 302, which can keep the flexible barrier 400 sliding inside the fixed frame 301. The limiting ring 302 can cooperate with the fixed frame 301 to restrict the sliding of the flexible barrier 400. The limiting arc strip 303 can restrict the sliding frame 401. The limiting arc groove 405 on the inner side of the sliding frame 401 can be combined with the limiting arc strip 303. After combination, the stability of the sliding adjustment can be guaranteed during sliding.

[0037] like Figure 5 and Figure 6 As shown, the linkage nozzle adjustment assembly 002 includes two sets of rotating brackets 501, and the rotating brackets 501 are rotatably connected to the sliding frame 401 through bearings. An input pipe 502 is installed on the side of the rotating bracket 501 away from the sliding frame 401, and a fixed gear 503 is fixedly installed on the outer side of the rotating bracket 501 away from the sliding frame 401.

[0038] The linkage nozzle adjustment assembly 002 includes a drive motor 505. Three sets of connecting rods 504 are mounted on the back of the drive motor 505, and the connecting rods 504 are fixedly mounted on one side of the sliding frame 401. An adjustment gear 506 is fixedly mounted on the output end of the drive motor 505, and the adjustment gear 506 is meshed on one side of the adjustment gear 506.

[0039] A transmission pipe 507 is installed at the bottom of the rotating bracket 501. A limit pipe 508 is installed on the side of the two sets of transmission pipes 507 away from the rotating bracket 501, and a limit groove 509 is opened at the bottom of the limit pipe 508.

[0040] A movable tube 500 is slidably arranged in the middle of the limiting tube 508, and a sliding column 512 is installed at the bottom of the movable tube 500. The sliding column 512 is slidably arranged inside the limiting groove 509. Four sets of guide ports 510 are opened at the top of the movable tube 500. A cooling nozzle 511 is embedded on the side of the movable tube 500 away from the guide ports 510.

[0041] The above scheme is adopted: the rotating bracket 501 can be rotated and adjusted on the outside of the sliding frame 401 via a bearing connection, and the hole opened on the inner side of the rotating bracket 501 ensures that the liquid can flow normally for transmission. The input pipe 502 needs to be connected to an external water pump, and the liquid flow rate is controlled by an artificial intelligence controller. The fixed gear 503 can be adjusted under the drive of the adjusting gear 506. The drive motor 505 is fixedly connected to the sliding frame 401 via a connecting rod 504. The drive motor 505 can drive the adjusting gear 506 at the output end to rotate. During the rotation, it will mesh and drive the fixed gear 503 and the rotating bracket 501 to adjust the angle synchronously. With the cooperation of the intelligent controller and the sliding frame 401, the angle of the nozzle can be adjusted to meet different needs. The transmission pipe 507 can transmit the cooling liquid introduced by the input pipe 502. After transmission, it can be guided through the guide port 510. The limiting pipe 508 can restrict the inner movable pipe 500. The movable pipe 500 can slide laterally inside the limiting pipe 508. The limiting groove 509 of the limiting pipe 508 can restrict the sliding column 512 to prevent the movable pipe 500 from rotating. At the same time, it can limit the position of the movable pipe 500. Different types of nozzle structures are installed at the bottom of the movable pipe 500, which can spray liquid in different states to achieve different cooling effects.

[0042] like Figure 1 and Figure 2 As shown, a movable door 101 is provided on one side of the CNC machine tool 100, a collection and transmission module 102 is provided at the bottom of the CNC machine tool 100, and a maintenance cover plate 103 is installed on the side of the CNC machine tool 100 away from the movable door 101 by bolts.

[0043] A control panel 200 is fixedly installed on the top of the fixed frame 301 on the side away from the movable door 101, and an intelligent detector 206 is provided on the front of the control panel 200. A sliding plate 205 is fixedly installed on the top of the control panel 200, and an adjusting screw 203 is installed in the middle of the sliding plate 205. An adjusting motor 202 is fixedly installed at the input end of the adjusting screw 203.

[0044] A limit frame 201 is bolted to the back of the adjusting motor 202, and the limit frame 201 is fixedly installed on the top of the CNC machine tool 100 by bolts. Two sets of limit guide rods 204 are installed on the inner side of the limit frame 201, and the limit guide rods 204 are fixedly installed on the inner side of the sliding plate 205.

[0045] Using the above solution: the movable door 101 can be opened by pulling to replace the internal workpieces; the cooling liquid inside can be collected using the collection and transmission module 102, filtered, and then pumped back into the input pipe for recycling; the internal structure can be disassembled for maintenance using the maintenance cover 103; the control console 200 is used to connect the fixed frame 301 and the sliding plate 205; an artificial intelligence controller is installed on the side of the control console 200, specifically the NeuralController from Vector Intelligent Control under Nanqi Xianze, which is a general-purpose industrial AI controller that uses data cloning to generate... The high-fidelity digital twin model, optimized through reinforcement learning and integrated with intelligent control hardware, can seamlessly connect to existing systems to achieve intelligent control and facilitate network connectivity. It can also work with the intelligent monitor 206 to analyze and process the internal temperature status and perform targeted cooling. The adjusting motor 202 drives the adjusting screw 203 to rotate and adjust the sliding plate 205 through the thread control during the adjustment process. The limiting frame 201 can restrict the internal structure, and the limiting guide rod 204 can restrict the sliding plate 205 to ensure the stability of the sliding plate 205.

[0046] The working principle and usage process of this invention are as follows: The internal temperature is monitored by the control console 200 and the intelligent detector 206, and targeted control and adjustment are performed. The adjustment motor 202 drives the adjustment screw 203 to rotate. During the rotation, the threaded control sliding plate 205 slides laterally along the limiting guide rod 204 to change the position of the fixed frame 301. The dual-axis motor 402 is controlled to run, and the rotating drive gear 404 can mesh to adjust along the inner side of the fixed gear ring 300. During the adjustment, the control sliding frame 401 slides arc-shaped along the outer side of the fixed frame 301. During the adjustment, the limiting arc groove 405 and the limiting arc strip 303 are always matched. During the adjustment, the connecting bracket 403 pulls the flexible barrier plate 400 to slide between the limiting ring 302 and the fixed frame 301.

[0047] The drive motor 505 can then drive the adjusting gear 506 to rotate. The rotation will mesh with the fixed gear 503 and the rotating bracket 501 to adjust the angle along the axis. The pump body introduces the coolant into the input pipe 502, and then into the inner side of the limiting pipe 508 through the transmission pipe 507. The liquid will be concentrated and sprayed out through the guide port 510 and the cooling nozzle 511 for cooling. When different types of cooling nozzle adjustment are required, the position of the fixed frame 301 needs to be changed. After the movable tube 500 contacts the extrusion block 207, under the action of pressure, the movable tube 500 and the sliding column 512 will slide and adjust along the inner side of the limiting pipe 508 and the limiting slide groove 509.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for CNC machine tools based on artificial intelligence, comprising a CNC machine tool (100), characterized in that: The CNC machine tool (100) is provided with an all-around adjustment component (001) on its inner side; The omnidirectional adjustment component (001) includes a fixed frame (301), and a fixed gear ring (300) is fixedly installed on the inner side of the fixed frame (301). The omnidirectional adjustment component (001) includes a sliding frame (401), a dual-axis motor (402) is installed in the middle of the sliding frame (401), and a drive gear (404) is fixedly installed at the output end of the dual-axis motor (402). The drive gear (404) is meshed on the inner side of the fixed gear ring (300). A connecting bracket (403) is installed on the outer side of the dual-axis motor (402), and the connecting bracket (403) is fixedly installed on the inner side of the sliding frame (401). Flexible barrier plates (400) are installed at both ends of the connecting bracket (403), and the flexible barrier plates (400) are movably located on the inner side of the fixed frame (301).

2. The artificial intelligence-based CNC machine tool cooling device according to claim 1, characterized in that: Limiting rings (302) are installed on both sides inside the fixed frame (301), and the flexible barrier sheet (400) is slidably disposed between the fixed frame (301) and the limiting rings (302). Limiting arc strips (303) are fixedly installed on the front and back of the fixed frame (301).

3. The artificial intelligence-based CNC machine tool cooling device according to claim 2, characterized in that: Limiting arc grooves (405) are provided on the front and back sides of the inner side of the sliding frame (401). The limiting arc grooves (405) are slidably disposed on the outside of the limiting arc strip (303). A linkage nozzle adjustment assembly (002) is rotatably disposed on the outside of the sliding frame (401).

4. The artificial intelligence-based CNC machine tool cooling device according to claim 3, characterized in that: The linkage nozzle adjustment assembly (002) includes two sets of rotating brackets (501), and the rotating brackets (501) are rotatably connected to the sliding frame (401) through bearings. An input pipe (502) is installed on the side of the rotating bracket (501) away from the sliding frame (401), and a fixed gear (503) is fixedly installed on the outer side of the end of the rotating bracket (501) away from the sliding frame (401).

5. The artificial intelligence-based CNC machine tool cooling device according to claim 4, characterized in that: The linkage nozzle adjustment assembly (002) includes a drive motor (505), three sets of connecting rods (504) are mounted on the back of the drive motor (505), and the connecting rods (504) are fixedly mounted on one side of the sliding frame (401). An adjustment gear (506) is fixedly mounted on the output end of the drive motor (505), and the adjustment gear (506) is meshed on one side of the adjustment gear (506).

6. The artificial intelligence-based CNC machine tool cooling device according to claim 5, characterized in that: The bottom of the rotating bracket (501) is equipped with a transmission pipe (507), and the two sets of transmission pipes (507) are equipped with a limiting pipe (508) on the side away from the rotating bracket (501), and a limiting groove (509) is opened at the bottom of the limiting pipe (508).

7. The artificial intelligence-based CNC machine tool cooling device according to claim 6, characterized in that: A movable tube (500) is slidably arranged in the middle of the limiting tube (508), and a sliding column (512) is installed at the bottom of the movable tube (500). The sliding column (512) is slidably arranged inside the limiting groove (509). Four sets of guide ports (510) are opened at the top of the movable tube (500). A cooling nozzle (511) is embedded on the side of the movable tube (500) away from the guide ports (510).

8. The artificial intelligence-based CNC machine tool cooling device according to claim 1, characterized in that: A movable door (101) is provided on one side of the CNC machine tool (100), a collection and transmission module (102) is provided at the bottom of the CNC machine tool (100), and a maintenance cover plate (103) is installed on the side of the CNC machine tool (100) away from the movable door (101) by bolts.

9. The artificial intelligence-based CNC machine tool cooling device according to claim 8, characterized in that: A control panel (200) is fixedly installed on the top of the fixed frame (301) on the side away from the movable door (101), and an intelligent detector (206) is provided on the front of the control panel (200). A sliding plate (205) is fixedly installed on the top of the control panel (200), and an adjusting screw (203) is installed in the middle of the sliding plate (205). An adjusting motor (202) is fixedly installed at the input end of the adjusting screw (203).

10. The artificial intelligence-based CNC machine tool cooling device according to claim 9, characterized in that: The back of the regulating motor (202) is bolted with a limit frame (201), and the limit frame (201) is bolted to the top of the CNC machine tool (100). Two sets of limit guide rods (204) are installed on the inner side of the limit frame (201), and the limit guide rods (204) are fixedly installed on the inner side of the sliding plate (205). Extrusion blocks (207) are installed at the bottom of both ends of the limit frame (201).

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