Numerical control machine tool protective cover with oil mist absorbing and removing function

Abstract

The invention relates to the technical field of numerical control machine tools, in particular to a numerical control machine tool protective cover with an oil mist suction function, which comprises a protective cover and a mechanical arm fixedly mounted in the protective cover, a ventilation cover is fixedly mounted at the driving end of the mechanical arm, and a filter screen is fixedly mounted on the front surface of a rectangular frame. A first electromagnet and a second electromagnet are arranged at the two ends of the top of the rectangular frame correspondingly, a discharging groove is formed in the bottom of the rectangular frame, and a baffle plate is arranged in the discharging groove. The device has the beneficial effects that through the arrangement of the first electromagnet and the second electromagnet, under the action of the transmission mechanism and the telescopic mechanism at the same time, the effect of adsorbing and cleaning spiral cuttings in the filter screen is achieved, and through the arrangement of the two electromagnets, the spiral cuttings can be pulled apart by any one of the two electromagnets, so that the spiral cuttings can be removed. And the other electromagnet can attract the residual part, so that no spiral cuttings are left.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a protective cover for numerically controlled machine tools with an oil mist suction function. Background Art

[0002] CNC machine tools are widely used processing equipment in the manufacturing industry. CNC machine tools that use cutting fluids will produce a large amount of oil mist particles during wet machining. The protective cover can isolate the oil mist, coolant splashes and metal debris generated during the cutting process. At the same time, the oil mist is centrally processed through the built-in oil mist removal system (such as exhaust vents, mist suction devices, etc.) to keep the working environment clean and meet environmental protection requirements.

[0003] Usually, a suction hood is set inside the protective cover and cooperated with a mist suction device to remove the oil mist generated during the operation of the machine tool. The suction hood is generally set near the machine tool tool, and the suction port of the suction hood is usually tilted downward to remove the oil mist. In CNC machine tools, when cutting metal raw materials, spiral chips will be generated. When the suction hood removes the oil mist inside the protective cover, the spiral chips may be adsorbed into the suction hood and then enter the mist suction device. Large spiral chips may cause damage to some parts. In order to avoid this situation, a filter is usually installed at the suction port of the suction hood to intercept the spiral chips. In order to prevent the spiral chips from accumulating on the surface of the filter and affecting the effect of oil mist removal, the staff needs to clean the spiral chips in the filter regularly. When one end of the spiral chip has been sucked into the filter hole of the filter, the spiral chip may be broken when it is pulled out. The spiral chips that penetrate into the filter hole of the filter will fall into the inside of the suction hood, thereby increasing the cleaning difficulty of the staff. Summary of the invention

[0004] The object of the present invention is to provide a CNC machine tool protective cover with an oil mist suction function to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a CNC machine tool protective cover with oil mist suction function, comprising a protective cover and a mechanical arm fixedly installed inside the protective cover, a ventilation hood is fixedly installed on the driving end of the mechanical arm, a rectangular frame is fixedly installed on the front of the ventilation hood, a filter is fixedly installed on the front of the rectangular frame, an electromagnet 1 and an electromagnet 2 are respectively provided at the two ends of the top of the rectangular frame, a telescopic mechanism is provided on the top of the electromagnet 1 and the electromagnet 2, a transmission mechanism is provided on the top of the rectangular frame, a discharge trough is provided at the bottom of the rectangular frame, a baffle is provided inside the discharge trough, and opening mechanisms are provided on both sides of the baffle.

[0006] Preferably, a rectangular groove is provided on the front of the rectangular frame, the filter is fixedly installed inside the rectangular groove, and a ventilation duct is connected to the back of the ventilation hood.

[0007] Preferably, the telescopic mechanism includes two telescopic brackets and four fixed seats, and the four fixed seats are symmetrically arranged in groups of two. The tops of the two fixed seats located at the top are fixedly connected to the rectangular frame, and the bottoms of the two fixed seats located at the bottom are respectively fixedly connected to electromagnet 1 and electromagnet 2. One end of the top of the two telescopic brackets is rotatably connected to the rectangular frame, and one end of the bottom of the two telescopic brackets is rotatably installed on the top of electromagnet 1 and electromagnet 2 respectively. The tops of the other ends of the two telescopic brackets are jointly fixedly installed with rotating shaft 1, and the bottoms of the other ends of the two telescopic brackets are jointly fixedly installed with rotating shaft 2, and the two rotating shafts 1 and the two rotating shafts 2 are slidably connected to their respective corresponding fixed seats.

[0008] Preferably, both ends of the four fixing seats are provided with sliding grooves, and the two rotating shafts 1 and the two rotating shafts 2 are respectively slidably installed inside the corresponding sliding grooves.

[0009] Preferably, the transmission mechanism includes a cylinder, which is fixedly installed inside the rectangular frame, a connecting plate is fixedly installed on the side of the cylinder telescopic shaft close to the two telescopic brackets, a connecting rod 1 and a connecting rod 2 are symmetrically fixedly installed on the side of the connecting plate away from the cylinder, the connecting rod 2 is fixedly connected to its corresponding rotating shaft 1, a connecting rod 3 is provided on the external sliding sleeve of the connecting rod 1 at one end away from the connecting plate, the connecting rod 3 is fixedly connected to its corresponding rotating shaft 1 at a side away from the connecting rod 1, and a fixing component is provided inside the connecting rod 3.

[0010] Preferably, the fixing assembly includes a mounting plate and a clamping hole, the clamping hole is opened inside the rectangular frame, a trapezoidal block and a clamping block are fixedly installed on the side of the mounting plate close to the clamping hole, the clamping block and the trapezoidal block are both slidably connected to the connecting rod three, a spring one is fixedly installed between the side of the mounting plate away from the trapezoidal block and the inner wall of the connecting rod three, and a spring two is fixedly connected between the side of the connecting rod three away from the rotating shaft one and the inner wall of the connecting rod one.

[0011] Preferably, sliding rods are slidably sleeved on both ends of the back side of the shielding plate, and the sides of the two sliding rods away from the shielding plate are fixedly connected to the inner wall of the ventilation hood.

[0012] Preferably, the opening mechanism includes a fixed sleeve and a rotating rod, the fixed sleeve is fixedly installed on one side of the electromagnet, the rotating rod is rotatably installed inside the rectangular frame, a guide block is fixedly installed on one side of the inner wall of the fixed sleeve, a strip groove is opened on the outside of the rotating rod, the bottom of the strip groove is connected to an arc groove, the guide block cooperates with the strip groove and the arc groove, a transmission gear is fixedly installed on the bottom of the rotating rod, a rack is fixedly installed on one side of the baffle plate, and the transmission gear and the rack are meshed with each other.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By setting up electromagnet one and electromagnet two, under the action of the transmission mechanism and the telescopic mechanism, the spiral chips in the filter net can be adsorbed and cleaned. Moreover, by setting up the two electromagnets, no matter which one breaks the spiral chips, the other electromagnet will adsorb the remaining part, and no spiral chips will remain.

[0014] With the cooperation of the transmission mechanism and the telescopic mechanism, during the downward movement of electromagnet 1 and electromagnet 2, electromagnet 2 is always located below electromagnet 1, so as to avoid the problem that electromagnet 1 and electromagnet 2 correspond to each other for a long time and repel each other, thereby affecting the cooperation effect between other structures.

[0015] By setting an opening component, when the electromagnet moves to the bottom, the opening component acts on the baffle plate to move the baffle plate, thereby opening the discharge chute, and the spiral chips adsorbed on the surface of the electromagnet can be discharged through the discharge chute. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the partial appearance structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the rectangular frame of the present invention; Figure 4 For the present invention Figure 3 A is a local enlarged schematic diagram; Figure 5 It is a schematic diagram of the electromagnet 1 and its top structure of the present invention; Figure 6 It is a schematic diagram of the electromagnet 2 and its top structure of the present invention; Figure 7 It is a schematic diagram of the structure of the fixing sleeve of the present invention; Figure 8 It is a schematic diagram of the transmission mechanism of the present invention; Fig. 9 It is a schematic diagram of the rectangular frame structure of the present invention; Fig.10 It is a schematic diagram of the opening mechanism of the present invention.

[0017] In the accompanying drawings, the list of parts represented by each number is as follows: 1. Protective cover; 2. Robotic arm; 3. Ventilation hood; 4. Rectangular frame; 5. Filter; 6. Electromagnet 1; 7. Electromagnet 2; 8. Telescopic bracket; 9. Fixed seat; 10. Rotating shaft 1; 11. Rotating shaft 2; 12. Slide; 13. Discharge chute; 14. Shielding plate; 15. Rectangular groove; 16. Ventilation duct; 17. Cylinder; 18. Connecting plate; 19. Connecting rod 1; 20. Connecting rod 2; 21. Connecting rod 3; 22. Mounting plate; 23. Snap-in hole; 24. Trapezoidal block; 25. Snap-in block; 26. Spring 1; 27. Spring 2; 28. Slide rod; 29. ​​Fixed sleeve; 30. Rotating rod; 31. Guide block; 32. Strip groove; 33. Arc groove; 34. Transmission gear; 35. Rack. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides a technical solution: Figure 1-Figure 10 A protective cover for a numerically controlled machine tool with an oil mist suction function is shown, comprising a protective cover 1 and a mechanical arm 2 fixedly installed inside the protective cover 1, a ventilation cover 3 fixedly installed on the driving end of the mechanical arm 2, a rectangular frame 4 fixedly installed on the front of the ventilation cover 3, a filter screen 5 fixedly installed on the front of the rectangular frame 4, an electromagnet 1 6 and an electromagnet 2 7 are respectively provided at the two ends of the top of the rectangular frame 4, a telescopic mechanism is provided on the top of the electromagnet 1 6 and the electromagnet 2 7, a transmission mechanism is provided on the top of the rectangular frame 4, a discharge trough 13 is provided at the bottom of the rectangular frame 4, a baffle plate 14 is provided inside the discharge trough 13, and opening mechanisms are provided on both sides of the baffle plate 14.

[0020] A rectangular groove 15 is formed on the front of the rectangular frame 4 , and the filter screen 5 is fixedly installed inside the rectangular groove 15 . A ventilation duct 16 is connected to the back of the ventilation hood 3 .

[0021] The telescopic mechanism includes two telescopic brackets 8 and four fixed seats 9. The four fixed seats 9 are symmetrically arranged in groups of two. The tops of the two fixed seats 9 located at the top are fixedly connected to the rectangular frame 4, and the bottoms of the two fixed seats 9 located at the bottom are respectively fixedly connected to the electromagnet 1 6 and the electromagnet 2 7. One end of the top of the two telescopic brackets 8 is rotatably connected to the rectangular frame 4, and one end of the bottom of the two telescopic brackets 8 is rotatably installed on the top of the electromagnet 1 6 and the electromagnet 2 7 respectively. The tops of the other ends of the two telescopic brackets 8 are jointly fixedly installed with a rotating shaft 10, and the bottoms of the other ends of the two telescopic brackets 8 are jointly fixedly installed with a rotating shaft 2 11. The two rotating shafts 10 and the two rotating shafts 2 11 are both slidably connected to their respective corresponding fixed seats 9.

[0022] Both ends of the four fixing seats 9 are provided with sliding grooves 12 , and the two rotating shafts 10 and the two rotating shafts 2 11 are slidably installed in the corresponding sliding grooves 12 .

[0023] The transmission mechanism includes a cylinder 17, which is fixedly installed inside the rectangular frame 4. A connecting plate 18 is fixedly installed on the side of the telescopic axis of the cylinder 17 close to the two telescopic brackets 8. A connecting rod 19 and a connecting rod 20 are symmetrically fixedly installed on the side of the connecting plate 18 away from the cylinder 17. The connecting rod 20 is fixedly connected to its corresponding rotating shaft 10. A connecting rod 3 21 is provided on the external sliding sleeve of the end of the connecting rod 19 away from the connecting plate 18. The side of the connecting rod 3 21 away from the connecting rod 1 19 is fixedly connected to its corresponding rotating shaft 10, and a fixing component is arranged inside the connecting rod 3 21.

[0024] The fixing assembly includes a mounting plate 22 and a clamping hole 23. The clamping hole 23 is opened inside the rectangular frame 4. A trapezoidal block 24 and a clamping block 25 are fixedly installed on the side of the mounting plate 22 close to the clamping hole 23. The clamping block 25 and the trapezoidal block 24 are both slidably connected to the connecting rod three 21. A spring 1 26 is fixedly installed between the side of the mounting plate 22 away from the trapezoidal block 24 and the inner wall of the connecting rod three 21. A spring 27 is fixedly connected between the side of the connecting rod three 21 away from the rotating shaft 10 and the inner wall of the connecting rod 19.

[0025] Sliding rods 28 are slidably sleeved on both ends of the back side of the shielding plate 14 , and the two sliding rods 28 are fixedly connected to the inner wall of the ventilation cover 3 at one side away from the shielding plate 14 .

[0026] The opening mechanism includes a fixed sleeve 29 and a rotating rod 30. The fixed sleeve 29 is fixedly installed on one side of the electromagnet 6. The rotating rod 30 is rotatably installed inside the rectangular frame 4. A guide block 31 is fixedly installed on one side of the inner wall of the fixed sleeve 29. A strip groove 32 is opened on the outside of the rotating rod 30. The bottom of the strip groove 32 is connected with an arc groove 33. The guide block 31 cooperates with the strip groove 32 and the arc groove 33. A transmission gear 34 is fixedly installed on the bottom of the rotating rod 30. A rack 35 is fixedly installed on one side of the baffle plate 14. The transmission gear 34 and the rack 35 are meshed with each other.

[0027] Working principle: Before use, the robot arm 2 is programmed and linked with the machine tool CNC system to track the position of the machine tool tool in real time, thereby ensuring that the oil mist generated when the tool cuts the metal raw material can be absorbed to the greatest extent. The protective cover 1 isolates the oil mist, coolant splashes and metal debris generated during the cutting process, and connects the ventilation duct 16 to the mist suction device.

[0028] When in use, place the metal raw material inside the protective cover 1, then close the protective cover 1, use the robotic arm 2 to adjust the position of the ventilation hood 3 according to the position of the cutting tool, after the adjustment is completed, start the mist suction device, and then start the cutting tool to cut the metal raw material. The oil mist generated by the cutting tool when cutting the metal raw material is sucked into the interior of the mist suction device through the ventilation hood 3, and then the oil mist is centrally processed to keep the working environment clean and meet environmental protection requirements. Among them, the set filter net 5 intercepts the spiral chips generated by the cutting tool when cutting the metal raw material outside the ventilation hood 3 to prevent the spiral chips from entering the interior of the ventilation hood 3.

[0029] After the cutting work is completed, the mist suction device is turned off and the cylinder 17 is started. The cylinder 17 pushes the connecting plate 18 to move, and then pushes the connecting rod 19 and the connecting rod 20 to move. The connecting rod 19 and the connecting rod 20 are both close to the two telescopic brackets 8. The connecting rod 19 slides outside the connecting rod 3 21. At this time, the connecting rod 3 21 will not move. The connecting rod 20 pushes the rotating shaft 10 connected thereto to move. The two ends of the rotating shaft 10 slide inside the corresponding sliding grooves 12, and the two ends of the rotating shaft 2 11 directly below the rotating shaft 10 also slide inside the corresponding sliding grooves 12. When the electromagnet 27 moves, the telescopic bracket 8 located on the top of the electromagnet 27 is unfolded, thereby pushing the electromagnet 27 to move downward. When the electromagnet 27 moves, the electromagnet 16 and the electromagnet 27 are energized, and the connecting rod 19 gradually approaches the trapezoidal block 24 during the movement. When the electromagnet 27 moves to the bottom of the electromagnet 16, the connecting rod 19 acts on the trapezoidal block 24, and the trapezoidal block 24 is forced to move the mounting plate 22, and the mounting plate 22 drives the clamping block 25 to move synchronously and squeeze the spring 1 26. At this time, the clamping block 25 is separated from the inside of the clamping hole 23 , thereby releasing the fixation of the connecting rod 3 21, and the electromagnet 1 6 moves downward under the action of its own gravity, and the telescopic bracket 8 on the top of the electromagnet 1 6 extends accordingly, and the rotating shaft 10 and the rotating shaft 2 11 in the telescopic bracket 8 slide inside the corresponding sliding groove 12, and the spring 27 plays a buffering role. With the movement of the connecting plate 18, the electromagnet 1 6 and the electromagnet 2 7 move downward synchronously, and the electromagnet 2 7 is always located below the electromagnet 1 6. This setting avoids the mutual repulsion between the electromagnet 1 6 and the electromagnet 2 7. If the electromagnet 1 6 and electromagnet 2 7 correspond to each other. Under long-term conditions, the two telescopic brackets 8 will tilt, which will affect the coordination effect between other structures (it should be noted that when electromagnet 1 6 descends, it descends under the action of its own gravity). As electromagnet 1 6 and electromagnet 2 7 move, the spiral chips in the filter 5 can be adsorbed. Through the two electromagnets, no matter which one breaks the spiral chips, the other electromagnet will adsorb the remaining parts, thereby achieving automatic cleaning of the spiral chips remaining in the filter 5.

[0030] As the electromagnet 6 descends, the two opening mechanisms move accordingly, and the movement process of one of the opening mechanisms is as follows: the fixed sleeve 29 descends synchronously with the electromagnet 6, and the guide block 31 inside it slides downward along the strip groove 32. When the guide block 31 slides to the inside of the arc groove 33, as the electromagnet 6 continues to descend, the slide bar 28 slides along the arc groove 33. At this time, the rotating rod 30 is forced to rotate, and the transmission gear 34 at the bottom of the rotating rod 30 rotates. Under the meshing action of the transmission gear 34 and the rack 35, the rack 35 drives the baffle plate 14 to move, and the baffle plate 14 slides on the outside of the two slide bars 28, thereby opening the discharge chute 13.

[0031] When the electromagnet 1 6 moves to the bottom, the electromagnet 1 6 and the electromagnet 2 7 are both powered off, and the spiral chips on the surface of the electromagnet 1 6 and the electromagnet 2 7 fall off, and the spiral chips on the surface of the electromagnet 1 6 are discharged through the discharge groove 13. Subsequently, the two telescopic brackets 8 are shortened by shortening the telescopic shaft of the cylinder 17, thereby driving the electromagnet 1 6 and the electromagnet 2 7 to rise and reset. During the rising process of the electromagnet 1 6, the connecting rod 1 9 first pulls the connecting rod 3 21. When the clamping block 25 corresponds to the clamping hole 23, under the action of the spring 1 26, the clamping block 25 is clamped into the inside of the clamping hole 23, and the connecting rod 3 21 no longer moves. However, the connecting rod 1 19 slides outside the connecting rod 3 21 until the telescopic shaft of the cylinder 17 is reset.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective cover for a CNC machine tool with an oil mist removal function, comprising a protective cover (1) and a mechanical arm (2) fixedly mounted inside the protective cover (1), characterized in that: A ventilation hood (3) is fixedly mounted on the driving end of the mechanical arm (2), a rectangular frame (4) is fixedly mounted on the front of the ventilation hood (3), a filter screen (5) is fixedly mounted on the front of the rectangular frame (4), an electromagnet 1 (6) and an electromagnet 2 (7) are respectively arranged at the two ends of the top of the rectangular frame (4), a telescopic mechanism is arranged on the top of the electromagnet 1 (6) and the electromagnet 2 (7), a transmission mechanism is arranged on the top of the rectangular frame (4), a discharge trough (13) is provided at the bottom of the rectangular frame (4), a baffle plate (14) is arranged inside the discharge trough (13), and opening mechanisms are arranged on both sides of the baffle plate (14).

2. The protective cover for CNC machine tools with oil mist removal function according to claim 1 is characterized in that: The front of the rectangular frame (4) is provided with a rectangular groove (15), the filter screen (5) is fixedly installed inside the rectangular groove (15), and the back of the ventilation hood (3) is connected to a ventilation duct (16).

3. The protective cover for CNC machine tools with oil mist removal function according to claim 1 is characterized in that: The telescopic mechanism comprises two telescopic brackets (8) and four fixed seats (9), wherein the four fixed seats (9) are symmetrically arranged in pairs, the tops of the two fixed seats (9) located at the top are fixedly connected to the rectangular frame (4), and the bottoms of the two fixed seats (9) located at the bottom are respectively fixedly connected to the first electromagnet (6) and the second electromagnet (7), one end of the top of the two telescopic brackets (8) is rotatably connected to the rectangular frame (4), one end of the bottom of the two telescopic brackets (8) is rotatably mounted on the top of the first electromagnet (6) and the second electromagnet (7), the tops of the other ends of the two telescopic brackets (8) are commonly fixedly mounted with a rotating shaft (10), and the bottoms of the other ends of the two telescopic brackets (8) are commonly fixedly mounted with a rotating shaft (11), and the two rotating shafts (10) and the two rotating shafts (11) are slidably connected to the corresponding fixed seats (9).

4. The protective cover for CNC machine tools with oil mist removal function according to claim 3 is characterized in that: Both ends of the four fixing seats (9) are provided with sliding grooves (12), and the two rotating shafts 1 (10) and the two rotating shafts 2 (11) are respectively slidably mounted inside the corresponding sliding grooves (12).

5. The protective cover for CNC machine tools with oil mist removal function according to claim 3 is characterized in that: The transmission mechanism comprises a cylinder (17), wherein the cylinder (17) is fixedly mounted inside the rectangular frame (4); a connecting plate (18) is fixedly mounted on one side of the telescopic shaft of the cylinder (17) close to the two telescopic brackets (8); a connecting rod 1 (19) and a connecting rod 2 (20) are symmetrically fixedly mounted on one side of the connecting plate (18) away from the cylinder (17); the connecting rod 2 (20) is fixedly connected to its corresponding rotating shaft 1 (10); a connecting rod 3 (21) is provided on an external sliding sleeve at one end of the connecting rod 1 (19) away from the connecting plate (18); the connecting rod 3 (21) is fixedly connected to its corresponding rotating shaft 1 (10) on one side away from the connecting plate (18); a fixing component is provided inside the connecting rod 3 (21).

6. The protective cover for CNC machine tools with oil mist removal function according to claim 5, characterized in that: The clamping assembly comprises a mounting plate (22) and a clamping hole (23), wherein the clamping hole (23) is arranged inside the rectangular frame (4), a trapezoidal block (24) and a clamping block (25) are fixedly mounted on a side of the mounting plate (22) close to the clamping hole (23), the clamping block (25) and the trapezoidal block (24) are both slidably connected to the connecting rod three (21), a spring one (26) is fixedly mounted between a side of the mounting plate (22) away from the trapezoidal block (24) and an inner wall of the connecting rod three (21), and a spring two (27) is fixedly connected between a side of the connecting rod three (21) away from the rotating shaft one (10) and an inner wall of the connecting rod one (19).

7. The protective cover for CNC machine tools with oil mist removal function according to claim 1, characterized in that: Sliding rods (28) are slidably sleeved on both ends of the back side of the shielding plate (14), and the sides of the two sliding rods (28) away from the shielding plate (14) are fixedly connected to the inner wall of the ventilation hood (3).

8. The protective cover for CNC machine tools with oil mist removal function according to claim 1, characterized in that: The opening mechanism comprises a fixed sleeve (29) and a rotating rod (30), wherein the fixed sleeve (29) is fixedly mounted on one side of an electromagnet (6), and the rotating rod (30) is rotatably mounted inside the rectangular frame (4). A guide block (31) is fixedly mounted on one side of the inner wall of the fixed sleeve (29), a strip groove (32) is provided on the outside of the rotating rod (30), and an arc groove (33) is connected to the bottom of the strip groove (32), and the guide block (31) cooperates with the strip groove (32) and the arc groove (33), and a transmission gear (34) is fixedly mounted on the bottom of the rotating rod (30), and a rack (35) is fixedly mounted on one side of the shielding plate (14), and the transmission gear (34) and the rack (35) are meshed with each other.

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