A protective cover for CNC machine tools with oil mist removal function

Abstract

The present invention relates to the technical field of CNC machine tools, specifically a CNC machine tool protective cover with an oil mist suction function, comprising a protective cover and a robotic arm fixedly mounted inside the protective cover, a ventilation hood fixedly mounted on the driving end of the robotic arm, a filter fixedly mounted on the front of the rectangular frame, electromagnet 1 and electromagnet 2 respectively provided at the two ends of the top of the rectangular frame, a discharge trough provided at the bottom of the rectangular frame, and a baffle provided inside the discharge trough. The beneficial effect of the present invention is that the spiral chips in the filter are adsorbed and cleaned by the electromagnet 1 and electromagnet 2, under the action of the transmission mechanism and the telescopic mechanism, and that by the two electromagnets, no matter which one tears the spiral chips off, the other electromagnet will adsorb the remaining part, and no spiral chips will remain.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a numerically controlled machine tool protective cover 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 generate a large amount of oil mist particles during wet machining. Protective covers 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.), keeping the working environment clean and in compliance with environmental protection requirements.

[0003] Typically, a suction hood is installed inside the protective cover, combined with a mist extraction device, to remove the oil mist generated during machine tool operation. The suction hood is generally located near the machine tool's cutting 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 materials, spiral chips are generated. When the suction hood removes the oil mist inside the protective cover, the spiral chips may be absorbed into the suction hood and then enter the mist extraction device. Large spiral chips may cause damage to some parts. To avoid this, a filter is usually installed at the suction port of the suction hood to intercept the spiral chips. To prevent the spiral chips from accumulating on the filter surface and affecting the oil mist extraction effect, the spiral chips in the filter must be cleaned regularly. If one end of the spiral chip has been sucked into the filter pores, pulling it out may cause the spiral chip to break. Spiral chips that penetrate deep into the filter pores will fall into the suction hood, making it more difficult for the staff to clean it. Summary of the Invention

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

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

[0006] 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 above are fixedly connected to the rectangular frame, and the bottoms of the two fixed seats located below are fixedly connected to electromagnet 1 and electromagnet 2 respectively. 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 a rotating shaft 1, and the bottoms of the other ends of the two telescopic brackets are jointly fixedly installed with a rotating shaft 2. The two rotating shafts 1 and the two rotating shafts 2 are slidably connected to their respective corresponding fixed seats;

[0007] 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 side of the connecting rod 3 away from the connecting rod 1 is fixedly connected to its corresponding rotating shaft 1. A fixing component is provided inside the connecting rod 3.

[0008] 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.

[0009] Preferably, a rectangular groove is provided on the front of the rectangular frame, the filter is fixedly installed inside the rectangular groove, and the back of the ventilation hood is connected to a ventilation duct.

[0010] 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 in the interiors of their corresponding sliding grooves.

[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, 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:

[0014] 1. By setting up electromagnet 1 and electromagnet 2, under the action of the transmission mechanism and the telescopic mechanism, the spiral chips in the filter screen 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.

[0015] 2. With the cooperation of the transmission mechanism and the telescopic mechanism, when electromagnet 1 and electromagnet 2 move downward, 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.

[0016] 3. Through the opening component set, when the electromagnet moves to the bottom, the opening component acts on the baffle to move the baffle, 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

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the partial appearance structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the rectangular frame of the present invention;

[0020] Figure 4 For the present invention Figure 3 A local enlarged schematic diagram;

[0021] Figure 5 This is a schematic diagram of the electromagnet 1 and its top structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the electromagnet 2 and its top structure of the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the fixing sleeve of the present invention;

[0024] Figure 8 Schematic diagram of the transmission mechanism of the present invention;

[0025] Figure 9 This is a schematic diagram of the rectangular frame structure of the present invention;

[0026] Figure 10 It is a schematic diagram of the opening mechanism of the present invention.

[0027] 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

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution: Figures 1-10 The protective cover for a CNC machine tool with an oil mist suction function shown in the figure comprises a protective cover 1 and a robotic arm 2 fixedly mounted inside the protective cover 1, a ventilation cover 3 fixedly mounted on the driving end of the robotic arm 2, a rectangular frame 4 fixedly mounted on the front of the ventilation cover 3, a filter screen 5 fixedly mounted on the front of the rectangular frame 4, an electromagnet 1 6 and an electromagnet 2 7 respectively provided at both ends of the top of the rectangular frame 4, a telescopic mechanism provided at the top of the electromagnet 1 6 and the electromagnet 2 7, a transmission mechanism provided at the top of the rectangular frame 4, a discharge chute 13 provided at the bottom of the rectangular frame 4, a baffle 14 provided inside the discharge chute 13, and opening mechanisms provided on both sides of the baffle 14;

[0030] 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 above are fixedly connected to the rectangular frame 4, and the bottoms of the two fixed seats 9 located below are fixedly connected to the electromagnet 1 6 and the electromagnet 2 7 respectively. 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 corresponding fixed seats 9;

[0031] 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 19 is fixedly connected to its corresponding rotating shaft 10. A fixing component is provided inside the connecting rod 3 21.

[0032] 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 1 19.

[0033] A rectangular groove 15 is formed on the front of the rectangular frame 4 , and the filter 5 is fixedly installed inside the rectangular groove 15 . A ventilation duct 16 is connected to the back of the ventilation hood 3 .

[0034] Both ends of the four fixing seats 9 are provided with a sliding groove 12 , and the two rotating shafts 10 and the two rotating shafts 11 are slidably installed in the corresponding sliding grooves 12 respectively.

[0035] 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 cover 3 .

[0036] 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 to 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 14. The transmission gear 34 and the rack 35 are meshed with each other.

[0037] 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.

[0038] During use, the metal raw material is placed inside the protective cover 1, and then the protective cover 1 is closed. The position of the ventilation hood 3 is adjusted according to the position of the cutting tool by the robotic arm 2. After the adjustment is completed, the mist suction device is started, and then the cutting tool is started 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 filter screen 5 is set to intercept 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.

[0039] 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 1 19 and the connecting rod 2 20 to move. The connecting rod 1 19 and the connecting rod 2 20 are close to the two telescopic brackets 8. The connecting rod 1 19 slides outside the connecting rod 3 21. At this time, the connecting rod 3 21 will not move. The connecting rod 2 20 pushes the rotating shaft 10 connected to it to move. The two ends of the rotating shaft 10 slide inside the corresponding slide groove 12, and the two ends of the rotating shaft 2 11 directly below the rotating shaft 10 also slide inside the corresponding slide groove 12. When the electromagnet 27 moves, the telescopic bracket 8 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. 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. 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 disengaged 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. The rotating shaft 10 and the rotating shaft 2 11 in the telescopic bracket 8 slide inside the corresponding slide groove 12, and the spring 2 27 plays a buffering role. As the connecting plate 18 moves, 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 arrangement avoids 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 part, thereby achieving automatic cleaning of the spiral chips remaining in the filter 5.

[0040] 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 14 to move, and the baffle 14 slides on the outside of the two slide bars 28, thereby opening the discharge chute 13.

[0041] When electromagnet 1 6 moves to the bottom, electromagnet 1 6 and electromagnet 2 7 are both powered off, and the spiral chips on the surface of electromagnet 1 6 and electromagnet 2 7 fall off, and the spiral chips on the surface of electromagnet 1 6 are discharged through the discharge trough 13. Subsequently, the two telescopic brackets 8 are shortened by the shortening of the telescopic shaft of the cylinder 17, thereby driving electromagnet 1 6 and electromagnet 2 7 to rise and reset. During the rising process of electromagnet 1 6, connecting rod 1 19 first pulls connecting rod 3 21. When the clamping block 25 corresponds to the clamping hole 23, under the action of spring 1 26, the clamping block 25 is clamped into the inside of the clamping hole 23, and connecting rod 3 21 no longer moves. However, connecting rod 1 19 slides outside connecting rod 3 21 until the telescopic shaft of the cylinder 17 is reset.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the 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: The driving end of the mechanical arm (2) is fixedly mounted with a ventilation hood (3), the front of the ventilation hood (3) is fixedly mounted with a rectangular frame (4), the front of the rectangular frame (4) is fixedly mounted with a filter (5), the two ends of the top of the rectangular frame (4) are respectively provided with an electromagnet 1 (6) and an electromagnet 2 (7), the tops of the electromagnet 1 (6) and the electromagnet 2 (7) are provided with a telescopic mechanism, the top of the rectangular frame (4) is provided with a transmission mechanism, the bottom of the rectangular frame (4) is provided with a discharge trough (13), the interior of the discharge trough (13) is provided with a shielding plate (14), and both sides of the shielding plate (14) are provided with an opening mechanism; The telescopic mechanism comprises two telescopic brackets (8) and four fixed seats (9), the four fixed seats (9) are symmetrically arranged in pairs, the tops of the two fixed seats (9) located above are fixedly connected to the rectangular frame (4), and the bottoms of the two fixed seats (9) located below are 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), 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), the tops of the other ends of the two telescopic brackets (8) are fixedly installed with a rotating shaft 1 (10), and the bottoms of the other ends of the two telescopic brackets (8) are fixedly installed with a rotating shaft 2 (11), and the two rotating shafts 1 (10) and the two rotating shafts 2 (11) are slidably connected to their respective corresponding fixed seats (9); The transmission mechanism includes a cylinder (17), the cylinder (17) is fixedly installed inside the rectangular frame (4), a connecting plate (18) is fixedly installed on the 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 installed on the 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), the external sliding sleeve of the connecting rod 1 (19) away from the connecting plate (18) is provided with a connecting rod 3 (21), the side of the connecting rod 3 (21) away from the connecting rod 1 (19) is fixedly connected to its corresponding rotating shaft 1 (10), and a fixing component is provided inside the connecting rod 3 (21); The clamping assembly includes a mounting plate (22) and a clamping hole (23), wherein the clamping hole (23) is provided inside the rectangular frame (4), and 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), wherein the clamping block (25) and the trapezoidal block (24) are both slidably connected to the connecting rod three (21), and 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).

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

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

4. 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).

5. The protective cover for CNC machine tools with oil mist removal function according to claim 1, characterized in that: The opening mechanism includes a fixed sleeve (29) and a rotating rod (30), wherein the fixed sleeve (29) is fixedly mounted on one side of the 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), and a strip groove (32) is provided on the outside of the rotating rod (30). The bottom of the strip groove (32) is connected to an arc groove (33), and the guide block (31) cooperates with the strip groove (32) and the arc groove (33). 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). The transmission gear (34) and the rack (35) are meshed with each other.

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