A counterweight anti-fall device for a CNC horizontal milling and boring machine and the CNC horizontal milling and boring machine.

Abstract

This utility model relates to the field of horizontal milling and boring machines, and more particularly to a counterweight anti-fall device for a CNC horizontal milling and boring machine and the CNC horizontal milling and boring machine itself. The counterweight anti-fall device for the CNC horizontal milling and boring machine provided by this utility model has practical application value in multiple dimensions: in terms of equipment protection, it can effectively avoid major mechanical failures such as damage to the main structure of the machine tool and deformation of the guide rails caused by falling counterweights, significantly extending the service life of the equipment; in terms of safe production, it completely eliminates the risk of personal injury to operators caused by accidental falling counterweights; in terms of economy, it reduces unplanned downtime through preventative maintenance, significantly lowering maintenance costs. Actual testing has verified that the response time of this counterweight anti-fall device is less than 50ms, and the warning accuracy rate reaches over 99.9%, fully meeting the safety protection requirements of high-precision CNC machine tools and completely solving a long-standing safety hazard in the industry.

Description

Technical Field

[0001] This utility model relates to the field of horizontal milling and boring machines, and in particular to a counterweight anti-fall device for a CNC horizontal milling and boring machine and the CNC horizontal milling and boring machine. Background Technology

[0002] As a core piece of equipment in modern precision manufacturing, CNC horizontal milling and boring machines undertake critical processing tasks in high-end manufacturing industries such as aerospace and new energy. With the continuous improvement of manufacturing precision requirements, equipment reliability issues are becoming increasingly prominent, placing unprecedentedly high standards on the life prediction and safety assurance of CNC horizontal milling and boring machines. During operation, the Y-axis spindle box needs to frequently perform vertical lifting movements. Considering the large weight of the spindle box, traditional designs typically use a chain-weight balancing system to distribute the load. However, this design has significant safety hazards. When the chain, subjected to alternating loads for a long time, reaches its fatigue limit, it may experience brittle fracture without warning. In such a case, the unrestrained weight and spindle box will fall freely under gravity, causing severe damage to machine tools worth millions of yuan and potentially leading to serious personal injury accidents. Faced with this severe technical challenge, developing a highly reliable anti-fall safety device for the weight of CNC horizontal milling and boring machines has become a major issue urgently needing breakthroughs in the field of machine tool safety technology. Utility Model Content

[0003] This utility model provides a counterweight anti-fall device for a CNC horizontal milling and boring machine, which solves the problem that existing CNC horizontal milling and boring machines lack a device to detect chain breakage, resulting in poor equipment safety.

[0004] This utility model provides a counterweight anti-fall device for a CNC horizontal milling and boring machine, comprising: A fixing component is connected to the spindle box; A piston body is connected to the fixing assembly. The piston body has an internal cavity, and a zero-position sensor is provided at one end of the piston body. A support rod is slidably inserted into the cavity, one end of the support rod is provided with a limiting element, and the other end of the support rod extends from the other end of the piston body to the outside of the piston body; An elastic element is disposed within the cavity, one end of which abuts against the limiting element, and the other end of which abuts against the other end of the piston body, so that the limiting element is within the detection range of the zero-position sensor; A flexible connection assembly is connected to the other end of the support rod and the counterweight. When the transmission chain undergoes elastic deformation, the falling displacement of the weight is transmitted to the support rod through the flexible connection assembly, causing the elastic element to be compressed and the limiting element to move away from the zero-position sensor. The zero-position sensor is then triggered to output a first alarm signal.

[0005] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine includes a flexible connection component comprising: A steel wire rope, one end of which is connected to the other end of the support rod, and the other end of which is connected to the counterweight.

[0006] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine, the flexible connection assembly further includes: The guide wheel is rotatably coupled with the pulley frame, and the wire rope is wound in the rope groove of the guide wheel.

[0007] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine is provided, wherein one end of the wire rope is detachably connected to the other end of the support rod, and the other end of the wire rope is detachably connected to the counterweight.

[0008] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine is provided, wherein one end of the wire rope is connected to the other end of the support rod through a first lifting ring, and the other end of the wire rope is connected to the counterweight through a second lifting ring.

[0009] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine is provided, wherein the elastic element includes a compression spring, and the compression spring is sleeved on the outer periphery of the support rod.

[0010] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine further includes: A limit sensor is disposed on the side wall at the other end of the piston body. When the limiting member enters the detection range of the limit sensor, the limit sensor outputs a second alarm signal.

[0011] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine includes a fixing component comprising: A right-angle bracket is connected to the other end of the piston body. The right-angle bracket is provided with a through hole, and the other end of the support rod can be slidably inserted into the through hole. A support frame is connected to the right-angle bracket and the spindle box.

[0012] According to the present invention, a counterweight anti-fall device for a CNC horizontal milling and boring machine is provided, wherein the support frame is provided with a strip-shaped through hole extending along its own length direction, and the right-angle bracket is connected to the support frame through bolts in the strip-shaped through hole.

[0013] The present invention provides a CNC horizontal milling and boring machine, including the anti-fall device for the counterweight of the CNC horizontal milling and boring machine described in any of the above claims.

[0014] The anti-fall device for the counterweight of the CNC horizontal milling and boring machine provided by this utility model has practical application value in multiple dimensions: In terms of equipment protection, it can effectively avoid major mechanical failures such as damage to the main structure of the machine tool and deformation of the guide rails caused by the falling counterweight, significantly extending the service life of the equipment; in terms of safe production, it completely eliminates the risk of personal injury to operators caused by accidental falling counterweights; in terms of economy, it reduces unplanned downtime through preventive maintenance, significantly reducing maintenance costs. Actual testing has verified that the response time of this anti-fall device is less than 50ms, and the warning accuracy rate reaches over 99.9%, fully meeting the safety protection requirements of high-precision CNC machine tools and completely solving a long-standing safety hazard in the industry. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the working principle of the anti-fall device for the counterweight of the CNC horizontal milling and boring machine provided by this utility model.

[0017] Figure 2 This is a side view sectional diagram of the anti-fall device for the counterweight of the CNC horizontal milling and boring machine provided by this utility model.

[0018] Figure label: 1. Spindle box; 2. Counterweight anti-fall device; 3. Chain; 4. Steel wire rope; 5. Pulley frame; 6. Steel guide rail; 7. Lead screw; 8. Counterweight; 9. Support rod; 10. Compression spring; 11. Piston body; 12. Zero position sensor; 13. First lifting ring; 14. Right angle bracket; 15. Limit sensor; 16. Support frame; 17. Limiting component; 18. Guide ring; 19. Guide wheel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0024] Figure 1 A schematic diagram illustrating the working principle of the anti-fall device for the counterweight of the CNC horizontal milling and boring machine provided by this utility model is shown. Figure 2 A side sectional view of the anti-fall device for the counterweight of the CNC horizontal milling and boring machine provided by this utility model is shown in the example. Figure 1 and Figure 2 As shown, the anti-fall device of the counterweight of the CNC horizontal milling and boring machine includes a fixed component, a piston body 11, a support rod 9, an elastic element and a flexible connection component. The fixed component is connected to the spindle box 1; the spindle box 1 is slidably fitted with the steel guide rail 6 and threadedly fitted with the lead screw 7. The piston body 11 is connected to the fixed assembly. The piston body 11 has a cavity inside. A zero-position sensor 12 is provided at one end of the piston body 11 and is electrically connected to the main unit. The support rod 9 is slidably inserted into the cavity. One end of the support rod 9 is provided with a limiting member 17, and the other end of the support rod 9 extends from the other end of the piston body 11 to the outside of the piston body 11. An elastic member is provided in the cavity. One end of the elastic member abuts against the limiting member 17, and the other end of the elastic member abuts against the other end of the piston body 11, so that the limiting member 17 is within the detection range of the zero-position sensor 12. The flexible connection assembly is connected to the other end of the support rod 9 and the counterweight 8. When the transmission chain 3 undergoes elastic deformation, the falling displacement of the counterweight 8 is transmitted to the support rod 9 through the flexible connection assembly, causing the elastic member to be compressed and the limiting member 17 to move away from the zero-position sensor 12. The zero-position sensor 12 is triggered to output a first alarm signal. The zero-position sensor 12 sends the first alarm signal to the main unit, prompting the operator to promptly inspect and repair the chain 3 and other related components.

[0025] The anti-fall device for the counterweight 8 of this utility model for a CNC horizontal milling and boring machine has practical application value in multiple dimensions: In terms of equipment protection, it can effectively avoid major mechanical failures such as damage to the main structure of the machine tool and deformation of the guide rails caused by the falling counterweight 8, significantly extending the service life of the equipment; in terms of safe production, it completely eliminates the risk of personal injury to operators caused by the accidental falling counterweight 8; in terms of economy, it reduces unplanned downtime through preventive maintenance, significantly reducing maintenance costs. Actual testing has verified that the response time of the anti-fall device 8 is less than 50ms, and the warning accuracy rate reaches over 99.9%, fully meeting the safety protection requirements of high-precision CNC machine tools and completely solving a long-standing safety hazard in the industry.

[0026] In one embodiment of this utility model, such as Figure 2 As shown, the piston body 11 has a tubular structure. It provides a mounting base for the support rod 9, the elastic element, and the flexible connection assembly, and also guides the support rod 9, allowing it to move along the length of the piston body 11. The inner bore of the piston body 11 directly acts as a high-precision guide pair, significantly improving overall coaxiality and motion sensitivity. The sidewalls of the cavity provide full circumferential constraint for the compression spring 10, preventing lateral buckling of the spring under high-speed impact. Furthermore, the enclosed cavity inside the piston body 11 also acts as a natural dust cover, preventing chips and coolant from entering the moving parts, ensuring that the device maintains a low frictional resistance of ≤0.05 mm under harsh working conditions, thereby controlling the response time to within 50 ms and ensuring the high reliability and long lifespan of the counterweight 8 fall arrest system.

[0027] In one embodiment of this utility model, the zero-position sensor 12 is disposed at one end of the piston body 11, that is, the lower end of the piston body 11. The zero-position sensor 12 can be a micro switch, a photoelectric sensor, or other types of sensors.

[0028] In one embodiment of this utility model, such as Figure 2 As shown, the support rod 9 has a rod-shaped structure and is coaxially arranged with the piston body 11. The limiting member 17 is circular and perpendicular to the support rod 9, and is integrally formed with the support rod 9. Furthermore, a guide ring 18 is provided circumferentially on the limiting member 17. The outer diameter of the guide ring 18 matches the inner diameter of the cavity. The guide ring 18 guides the support rod 9, preventing it from wobbling during its up-and-down movement. The guide ring 18 forms a full-circumferential precision sliding pair with the cavity wall, which can suppress the radial sway of the support rod 9 during rapid start-stop to a very small range, significantly reducing the lateral sway and wear of the wire rope 4 and the support rod 9, and extending the service life of the anti-fall device 2 of the counterweight 8. In addition, the guide ring 18 and the limiting member 17 serve as spring seats, eliminating the need for additional retaining rings or retaining rings, reducing the number of parts and simplifying the structure of the device.

[0029] In one embodiment of this utility model, such as Figure 1 As shown, the flexible connection assembly includes a steel wire rope 4, one end of which is connected to the other end of the support rod 9, and the other end of the steel wire rope 4 is connected to the counterweight 8. When the transmission chain 3 undergoes elastic deformation, the falling displacement of the counterweight 8 is transmitted to the support rod 9 through the steel wire rope 4, causing the elastic element to be compressed, thereby driving the support rod 9 to move. The flexible characteristics of the steel wire rope 4 enable it to form timely displacement transmission between the counterweight 8 and the support rod 9, ensuring that the displacement is accurately transmitted in a linear ratio of 1:1, and the sensor triggering accuracy reaches ±0.5 mm.

[0030] In one embodiment of this utility model, such as Figure 1 As shown, the flexible connection assembly also includes two guide wheels 19, which are rotatably engaged with the pulley frame 5. The two guide wheels 19 are spaced apart along the width direction of the pulley frame 5, and the steel wire rope 4 is wound in the rope groove of the guide wheel 19. Preferably, the guide wheel 19 is coaxially arranged with the pulley. When the chain 3 deforms, the pulley will also rotate slightly, thereby driving the guide wheel 19 to rotate, causing the steel wire rope 4 to deform and improving the trigger sensitivity of the zero-position sensor 12.

[0031] In one embodiment of this utility model, one end of the wire rope 4 is detachably connected to the other end of the support rod 9, and the other end of the wire rope 4 is detachably connected to the counterweight 8. The detachable connection method can reduce the installation and disassembly steps of the wire rope 4 and improve the assembly efficiency.

[0032] In one embodiment of this utility model, such as Figure 2 As shown, one end of the wire rope 4 is connected to the other end of the support rod 9 via a first lifting ring 13. Specifically, the ring body of the first lifting ring 13 is connected to one end of the wire rope 4, and the rod body of the first lifting ring 13 is threadedly connected to the other end of the support rod 9. By rotating the first lifting ring 13, the tension of the wire rope 4 can be precisely adjusted. The other end of the wire rope 4 is connected to the counterweight 8 via a second lifting ring. Specifically, the ring body of the second lifting ring is connected to the other end of the wire rope 4, and the rod body of the second lifting ring is threadedly connected to the counterweight 8. By rotating the second lifting ring, the tension of the wire rope 4 can also be precisely adjusted. This bidirectional threaded lifting ring structure replaces the traditional one-time crimping with a fine-adjustable mechanical connection, allowing the wire rope 4 to be continuously and steplessly tensioned within the range of 0–10 mm with a fine thread pitch of 0.1 mm / revolution. The tension of the wire rope 4 can be precisely adjusted on-site without the need for an additional tensioning device.

[0033] In one embodiment of this utility model, such as Figure 2As shown, the elastic element includes a compression spring 10, which is sleeved on the outer periphery of the support rod 9. The upper end of the compression spring 10 abuts against the upper end of the piston body 11 or the right-angle bracket 14, and the lower end of the compression spring 10 abuts against the limiting member 17. Normally, the compression spring 10 is in a first compressed state, pushing the limiting member 17 within the detection range of the zero-position sensor 12. When the transmission chain 3 undergoes elastic deformation, the falling displacement of the weight 8 is transmitted to the support rod 9 through the wire rope 4, further compressing the elastic element. The first compressed state provides the device with a certain preload, which eliminates internal gaps to prevent false alarms and allows for immediate response when the chain 3 deforms, thus shortening the alarm delay time to within a predetermined range.

[0034] In one embodiment of this utility model, such as Figure 2 As shown, the anti-fall device for the counterweight of the CNC horizontal milling and boring machine also includes a limit sensor 15. The limit sensor 15 is located on the side wall of the other end of the piston body 11 and is electrically connected to the main machine. When the limit member 17 enters the detection range of the limit sensor 15, the limit sensor 15 outputs a second alarm signal. The limit sensor 15 sends the second alarm signal to the main machine, controlling the CNC horizontal milling and boring machine to stop working and prompting the operator to replace the chain 3 and other related parts in time, fundamentally avoiding the risk of the counterweight 8 falling due to the brittle fracture of the chain 3. The limit sensor 15 and the zero-position sensor 12 form a dual-threshold closed-loop monitoring: the zero-position sensor 12 is responsible for capturing the elastic elongation of the chain 3 within a certain range and outputting a first-level warning, while the limit sensor 15 immediately triggers a second-level emergency stop before the cumulative elongation of the chain 3 reaches the critical point, giving the operator sufficient downtime for maintenance.

[0035] In one embodiment of this utility model, such as Figure 2 As shown, the fixing assembly includes a right-angle bracket 14 and a support frame 16. The right-angle bracket 14 is connected to the other end of the piston body 11. The right-angle bracket 14 is provided with a through hole, and the support rod 9 is vertically arranged. The other end of the support rod 9 is slidably inserted into the through hole. The upper end of the support frame 16 is connected to the right-angle bracket 14, and the lower end of the support frame 16 is connected to the spindle box 1 by bolts. The modular structure formed by the right-angle bracket 14 and the support frame 16 integrates the piston body 11, the support rod 9, and the sensor onto a rigid cantilever. The through hole of the right-angle bracket 14 provides a second-stage precision guide for the kinematic pair, reducing the radial runout of the support rod 9 during its vertical stroke and significantly reducing friction and wear.

[0036] In one embodiment of this utility model, the support frame 16 is provided with a strip-shaped through hole extending along its own length direction (i.e., the vertical direction), and the right-angle bracket 14 is connected to the support frame 16 through bolts in the strip-shaped through hole. The strip-shaped through hole and bolts cooperate to achieve a wide range of tension adjustment for the wire rope 4. This strip-shaped through hole provides stepless adjustment capability within its effective stroke, allowing the wire rope 4 to cover the center-of-gravity changes of different specifications of counterweights 8 without the need for cutting or replacing the wire rope 4; coarse and fine tensioning can be completed in a very short time using the bolts; in addition, this structure also has an installation error-tolerant function, which can compensate for errors in the position of the spindle box 1 through the strip-shaped through hole, simplifying on-site construction.

[0037] This utility model provides a counterweight fall prevention device for a CNC horizontal milling and boring machine, achieving comprehensive safety protection for the chain-counterweight balancing system of the CNC horizontal milling and boring machine. The device employs a multi-level safety protection mechanism: firstly, a precise mechanical transmission mechanism senses changes in the chain's stress state in real time; secondly, a high-sensitivity sensor system accurately detects abnormal displacement; and finally, a fast-response electrical control system provides immediate alarm. This three-in-one protection system not only monitors the chain's working status in real time but also provides early warning of potential breakage risks, transforming traditional post-event remediation into pre-event prevention, fundamentally changing the passive protection approach.

[0038] This utility model also provides a CNC horizontal milling and boring machine, which includes the anti-fall device for the counterweight of the CNC horizontal milling and boring machine described in any of the above embodiments.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A counterweight anti-fall device for a CNC horizontal milling and boring machine, characterized in that, include: A fixing component is connected to the spindle box (1); Piston body (11), the piston body (11) is connected to the fixing assembly, the piston body (11) has a cavity inside, and a zero position sensor (12) is provided at one end of the piston body (11). A support rod (9) is slidably inserted into the cavity. One end of the support rod (9) is provided with a limiting member (17), and the other end of the support rod (9) is inserted from the other end of the piston body (11) to the outside of the piston body (11). An elastic element is disposed in the cavity, one end of the elastic element abuts against the limiting element (17), and the other end of the elastic element abuts against the other end of the piston body (11), so that the limiting element (17) is within the detection range of the zero position sensor (12); A flexible connection assembly is connected to the other end of the support rod (9) and the counterweight (8); When the transmission chain (3) undergoes elastic deformation, the falling displacement of the hammer (8) is transmitted to the support rod (9) through the flexible connection assembly, causing the elastic element to be compressed and the limiting element (17) to move away from the zero-position sensor (12), and the zero-position sensor (12) is triggered to output the first alarm signal.

2. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to claim 1, characterized in that, The flexible connection component includes: A steel wire rope (4) is provided, one end of which is connected to the other end of the support rod (9), and the other end of which is connected to the counterweight (8).

3. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to claim 2, characterized in that, The flexible connection component further includes: The guide wheel (19) is rotatably coupled with the pulley frame (5), and the wire rope (4) is wound in the rope groove of the guide wheel (19).

4. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to claim 2, characterized in that, One end of the wire rope (4) is detachably connected to the other end of the support rod (9), and the other end of the wire rope (4) is detachably connected to the counterweight (8).

5. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to claim 2, characterized in that, One end of the wire rope (4) is connected to the other end of the support rod (9) through a first lifting ring (13), and the other end of the wire rope (4) is connected to the counterweight (8) through a second lifting ring.

6. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to any one of claims 1 to 4, characterized in that, The elastic element includes a compression spring (10), which is sleeved on the outer periphery of the support rod (9).

7. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to any one of claims 1 to 4, characterized in that, Also includes: Limit sensor (15) is disposed on the side wall at the other end of the piston body (11). When the limiting member (17) enters the detection range of the limit sensor (15), the limit sensor (15) outputs a second alarm signal.

8. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to any one of claims 1 to 4, characterized in that, The fixing component includes: A right-angle bracket (14) is connected to the other end of the piston body (11). The right-angle bracket (14) is provided with a through hole, and the other end of the support rod (9) is slidably inserted into the through hole. Support frame (16) is connected to the right-angle bracket (14) and the spindle box (1).

9. The anti-fall device for the counterweight of the CNC horizontal milling and boring machine according to claim 8, characterized in that, The support frame (16) is provided with a strip-shaped through hole extending along its own length direction, and the right-angle bracket (14) is connected to the support frame (16) through bolts in the strip-shaped through hole.

10. A CNC horizontal milling and boring machine, characterized in that, The device includes the anti-fall device for the counterweight of the CNC horizontal milling and boring machine as described in any one of claims 1 to 9.

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