Metal particle collecting device for electric spark cutting machine

Abstract

The invention belongs to the technical field of electric spark cutting machines, and discloses a metal particle collecting device for an electric spark cutting machine, which comprises a supporting base, a machining table is mounted at the top end of the supporting base, and a limiting mechanism is arranged at one end of a collecting mechanism. Through cooperation of structures such as a screening box, a first metal particle collecting pipeline and a second metal particle collecting pipeline, the device can suck metal particles into the screening box through a conveying pipe and then make contact with a screening plate, and large metal particles fall into the first metal particle collecting pipeline to be collected after being screened by the screening plate; the medium-sized metal particles are in contact with the screening net after passing through the screening plate and fall into the second metal particle collecting pipeline to be collected, and at the moment, the tiny metal particles fall into the third metal particle collecting pipeline to be collected after passing through the screening net, so that screening and collecting of the metal particles are completed; in this way, the purpose that the device can conveniently screen metal particles of different sizes is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric spark cutting machines, and specifically relates to a metal particle collecting device for an electric spark cutting machine. BACKGROUND

[0002] Spark wire cutting technology is a kind of special processing, which is different from traditional processing technology that needs to use mechanical force and mechanical energy to cut off, and mainly uses electric energy to realize the processing of materials, so that the electric spark wire cutting technology is not limited by the performance of materials and can process any material with hardness, strength and brittleness. In the process of pulse spark discharge and metal etching and cutting of a workpiece by a thin metal wire, many waste metal particles will be generated and will fall and scatter in the electric spark wire cutting machine, so that the operator is not easy to clean. Therefore, a metal particle collecting device needs to be used.

[0003] Patent No. CN222679736U discloses an auxiliary device of an electric spark wire cutting machine, and belongs to the technical field of electric spark wire cutting machines. The auxiliary device comprises a rack, a wire cutting machine head arranged on the top of the rack, a back-shaped groove arranged on the top surface of the rack, two U-shaped collecting boxes placed in the inner cavity of the back-shaped groove, a collecting groove formed in each of the two U-shaped collecting boxes, and a group of electric push rods fixedly installed on the top of each of the two U-shaped collecting boxes. When the material is placed on the rack for cutting, the two U-shaped collecting boxes are placed on the back-shaped groove. The electric push rods on the two U-shaped collecting boxes drive the U-shaped frame to move upwards. The U-shaped frame drives the elastic cloth to stretch out. When the cutting produces flying debris, the elastic cloth blocks the flying debris and makes the flying debris fall into the collecting groove for collection, thereby avoiding the danger of flying debris to the workers and improving the practicability of the device.

[0004] However, the device cannot screen the collected metal particles when in use, so that the metal particles of different sizes are mixed together, which affects the efficiency of subsequent recycling of the metal particles, and the metal particles of different sizes need to be classified and collected to ensure the efficiency of recycling. SUMMARY

[0005] To solve the problems in the background art, the application provides a metal particle collecting device for an electric spark cutting machine.

[0006] In order to achieve the above object, the present application provides the following technical scheme: A metal particle collecting device for electric spark cutting machine, comprising a supporting base, a machining table is installed at the top end of the supporting base, a cutting assembly is installed outside the machining table, a collecting cover is arranged outside the cutting assembly, a particle collecting mechanism is installed at one end of the collecting cover, a cylinder is fixed at the top end of the collecting cover, a screening mechanism is arranged at one end of the particle collecting mechanism, a collecting mechanism is installed outside the collecting cover, and a limiting mechanism is arranged at one end of the collecting mechanism; The particle collecting mechanism comprises a particle collecting opening, a particle collecting cover and an air suction pump, the particle collecting opening is fixed at the bottom end of the collecting cover, the output end of the particle collecting opening is communicated with the particle collecting cover, and the output end of the particle collecting cover is communicated with the air suction pump. The screening mechanism comprises a screening box, a first metal particle collecting pipeline and a second metal particle collecting pipeline, the screening box is fixed outside the collecting cover, the bottom end of the screening box is communicated with the first metal particle collecting pipeline, and the bottom end of the screening box is communicated with the second metal particle collecting pipeline. The collecting mechanism comprises a collector and a first collecting cavity, the collector is fixed outside the collecting cover, and the first collecting cavity is formed at one end of the collector.

[0007] Preferably, the output end of the air suction pump is communicated with a conveying pipe, two groups of particle collecting openings are arranged, and the particle collecting openings are symmetrically distributed about the central axis of the collecting cover.

[0008] Preferably, the input end of the screening box is communicated with a conveying pipe, the bottom end of the screening box is communicated with a third metal particle collecting pipeline, a screening plate is slidably connected inside the screening box, a first return spring is fixed outside the screening plate, a screening net is slidably connected inside the screening box, a second return spring is fixed outside the screening net, a servo motor is fixed inside the screening box, an eccentric wheel is fixed at the top end of the servo motor, a first arc plate is fixed at the top end of the screening plate, and a second arc plate is fixed at the top end of the screening net.

[0009] Preferably, the screening box is provided with two groups, the screening boxes are symmetrically distributed about the central axis of the collecting cover, the first return springs are provided with four groups, the first return springs are used for pressing the screening plates and making the screening plates keep a moving trend inward, and the screening plates are provided as inclined surfaces.

[0010] Preferably, the second return springs are provided with four groups, the second return springs are used for pressing the screening nets and making the screening nets keep a moving trend inward, the screening plate and the screening net are symmetrically distributed, and the first arc plate and the second arc plate are symmetrically distributed about the central axis of the servo motor.

[0011] Preferably, one end of the collector is provided with a second collecting cavity, one end of the collector is provided with a third collecting cavity, the inside of the collector is slidably connected with a collecting box, the outside of the collecting box is fixedly connected with a first collecting groove, the outside of the collecting box is fixedly connected with a second collecting groove, and the outside of the collecting box is fixedly connected with a third collecting groove.

[0012] Preferably, the collector is provided with two groups, the collector is symmetrically distributed about the central axis of the collecting cover, the outer wall of the collecting box is attached to the inner wall of the collector, the collecting box and the collector are slidably connected, and the first collecting cavity, the second collecting cavity and the third collecting cavity are arrayed.

[0013] Preferably, the limiting mechanism comprises an extension frame, a limiting plate and a limiting rod, the extension frame is fixed to the outside of the collecting box, the inside of the extension frame is movably connected with the limiting plate, the outside of the limiting plate is fixedly connected with the limiting rod, the outside of the limiting plate is fixedly connected with a rack, the inside of the extension frame is rotatably connected with a gear, and the top end of the gear is fixedly connected with a twist plate.

[0014] Preferably, the limiting plate and the extension frame are slidably connected, the limiting plate is provided with two groups, the limiting plate is symmetrically distributed about the central axis of the extension frame, and the limiting plate is provided with four groups.

[0015] Preferably, the outer wall of the rack is provided with teeth, the outer wall of the gear is provided with a plurality of groups of teeth, and the rack and the gear are meshingly connected.

[0016] Compared with the prior art, the present application has the following advantages: The present application cooperates the structures of the screening box, the first metal particle collecting pipeline, the second metal particle collecting pipeline and the like, so that the device can suck the metal particles into the inside of the screening box through the conveying pipeline, contact the screening plate, and make the large metal particles fall into the first metal particle collecting pipeline for collection after being screened by the screening plate, the medium-sized metal particles contact the screening net after passing through the screening plate and fall into the second metal particle collecting pipeline for collection, and the tiny metal particles fall into the third metal particle collecting pipeline for collection after passing through the screening net, so that the screening and collection of the metal particles are completed, thereby achieving the purpose of conveniently screening the metal particles of different sizes by the device.

[0017] The application cooperates the structures of the collector, the first collecting cavity, the second collecting cavity and the like, so that the device can pass through the first collecting cavity, the second collecting cavity and the third collecting cavity to enter the first collecting groove, the second collecting groove and the third collecting groove respectively according to the different sizes of the metal particles, and when the user needs to take out the collected metal particles, the metal particles are taken out by pulling the collecting box, so as to achieve the purpose of facilitating the device to collect the screened metal particles.

[0018] The application cooperates the structures of the extension frame, the limiting plate, the limiting rod and the like, so that the device can rotate the twist disc to drive the gear to rotate, the gear drives the two groups of racks and the limiting plate to expand when rotating, and then the limiting rod is inserted into the limiting hole opened between the two groups of collectors, and then the collecting box is limited, so as to achieve the purpose of facilitating the device to fix the collecting box. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic view of the application; Figure 2 It is a whole right view structure schematic view of the application; Figure 3 It is a collecting assembly structure schematic view of the application; Figure 4 It is a particle collecting mechanism structure schematic view of the application; Figure 5 It is a screening assembly structure schematic view of the application; Figure 6 It is a screening assembly internal structure schematic view of the application; Figure 7 It is a collecting mechanism structure schematic view of the application; Figure 6 It is a local section enlarged structure schematic view of the application; Figure 8 It is a screening mechanism partial structure schematic view of the application; Figure 9 It is a collecting mechanism structure schematic view of the application; Figure 10 It is a collecting mechanism front view structure schematic view of the application; Figure 11 It is a limiting mechanism structure schematic view of the application.

[0020] In the figure: 1. Support base; 2. Processing table; 3. Cutting assembly; 4. Collecting cover; 5. Cylinder; 6. Particle collecting mechanism; 601. Particle collecting port; 602. Particle collecting cover; 603. Suction pump; 604. Delivery pipe; 7. Screening mechanism; 701. Screening box; 702. First metal particle collecting pipe; 703. Second metal particle collecting pipe; 704. Third metal particle collecting pipe; 705. Screening plate; 706. First return spring; 707. Screening net; 708. Second return spring ;709, servo motor; 710, eccentric wheel; 711, first arc plate; 712, second arc plate; 8, collecting mechanism; 801, collector; 802, first collecting chamber; 803, second collecting chamber; 804, third collecting chamber; 805, collecting box; 806, first collecting trough; 807, second collecting trough; 808, third collecting trough; 9, limiting mechanism; 901, extension frame; 902, limiting plate; 903, limiting rod; 904, rack; 905, gear; 906, torsion plate. DETAILED DESCRIPTION

[0021] like Figures 1 to 11 As shown, the present invention provides a metal particle collection device for an electric spark cutting machine, comprising a supporting base 1, a processing table 2 is installed on the top of the supporting base 1, a cutting assembly 3 is installed on the outside of the processing table 2, a collecting cover 4 is provided on the outside of the cutting assembly 3, a particle collecting mechanism 6 is installed at one end of the collecting cover 4, a cylinder 5 is fixed on the top of the collecting cover 4, a screening mechanism 7 is provided at one end of the particle collecting mechanism 6, a collecting mechanism 8 is installed on the outside of the collecting cover 4, and a limiting mechanism 9 is provided at one end of the collecting mechanism 8.

[0022] like Figures 1 to 6 As shown, the particle collecting mechanism 6 includes a particle collecting port 601, a particle collecting cover 602 and an air suction pump 603. The particle collecting port 601 is fixed at the bottom end of the collecting cover 4. The output end of the particle collecting port 601 is connected to the particle collecting cover 602. The output end of the particle collecting cover 602 is connected to the air suction pump 603. The output end of the air suction pump 603 is connected to the conveying pipe 604. There are two groups of particle collecting ports 601, and the particle collecting ports 601 are symmetrically distributed about the central axis of the collecting cover 4.

[0023] The above solution is adopted: when cutting metal using the cutting assembly 3, the cylinder 5 is started to move the collecting cover 4 downward as a whole, so that the particle collection port 601 is close to the cutting end, and then after starting the suction pump 603, suction is performed, and the metal particles are sucked by negative pressure, and are transported to the inside of the screening box 701 through the conveying pipe 604 for screening.

[0024] like Figures 1 to 8As shown, the screening mechanism 7 includes a screening box 701, a first metal particle collecting pipe 702 and a second metal particle collecting pipe 703. The screening box 701 is fixed to the outside of the collecting cover 4. The bottom end of the screening box 701 is connected to the first metal particle collecting pipe 702, the bottom end of the screening box 701 is connected to the second metal particle collecting pipe 703, the input end of the screening box 701 is connected to the conveying pipe 604, and the bottom end of the screening box 701 is connected to the third metal particle collecting pipe 704. The interior of the screening box 701 is slidably connected to a screening plate 705, and the outside of the screening plate 705 is fixed with a first return spring 706. Two groups of screening boxes 701 are provided, and the screening boxes 701 are symmetrically distributed about the central axis of the collecting cover 4. Four groups of first return springs 706 are provided. The first return springs 706 are used to squeeze the screening plate 705 and keep it moving inward. The screening plate 705 is set as an inclined surface.

[0025] like Figures 1 to 8 As shown, the interior of the screening box 701 is slidably connected to a screening mesh 707, the outside of the screening mesh 707 is fixed with a second return spring 708, the interior of the screening box 701 is fixed with a servo motor 709, the top of the servo motor 709 is fixed with an eccentric wheel 710, the top of the screening plate 705 is fixed with a first arc plate 711, the top of the screening mesh 707 is fixed with a second arc plate 712, four groups of second return springs 708 are provided, the second return springs 708 are used to squeeze the screening mesh 707 and keep it moving inward, the screening plate 705 and the screening mesh 707 are symmetrically distributed, and the first arc plate 711 and the second arc plate 712 are symmetrically distributed about the central axis of the servo motor 709.

[0026] The above scheme is adopted: after the metal particles are sucked into the screening box 701 through the conveying pipe 604, they come into contact with the screening plate 705. The large metal particles are screened by the screening plate 705 and fall into the first metal particle collection pipe 702 for collection. The medium-sized metal particles pass through the screening plate 705 and contact the screening mesh 707 and fall into the second metal particle collection pipe 703 for collection. At this time, the tiny metal particles pass through the screening mesh 707 and fall into the third metal particle collection pipe 704 for collection, thereby completing the metal particle sorting. The particles are screened and collected, and after long-term use of the device, metal particles may accumulate on the surface of the screen plate 705 and the screen mesh 707. The servo motor 709 is started to drive the eccentric wheel 710 to rotate, squeezing the first arc plate 711 and the second arc plate 712, and then squeezing the screen plate 705 and the screen mesh 707, and reset them through the first reset spring 706 and the second reset spring 708, so that the screen plate 705 and the screen mesh 707 vibrate, thereby shaking off the metal particles attached to the surface to avoid blockage and low screening efficiency.

[0027] like Figures 1 to 10As shown, the collecting mechanism 8 comprises a collector 801 and a first collecting cavity 802, the collector 801 is fixed outside the collecting cover 4, one end of the collector 801 is provided with the first collecting cavity 802, one end of the collector 801 is provided with a second collecting cavity 803, one end of the collector 801 is provided with a third collecting cavity 804, the inside of the collector 801 is slidably connected with a collecting box 805, the outside of the collecting box 805 is fixed with a first collecting groove 806, the outside of the collecting box 805 is fixed with a second collecting groove 807, the outside of the collecting box 805 is fixed with a third collecting groove 808, the collector 801 is provided with two groups, the collector 801 is symmetrically distributed about the central axis of the collecting cover 4, the outer wall of the collecting box 805 is attached to the inner wall of the collector 801, the collecting box 805 and the collector 801 are slidably connected, the first collecting cavity 802, the second collecting cavity 803 and the third collecting cavity 804 are arrayed, and the first collecting groove 806, the second collecting groove 807 and the third collecting groove 808 are arrayed.

[0028] By adopting the above scheme: by passing through the first collecting cavity 802, the second collecting cavity 803 and the third collecting cavity 804, the metal particles of different sizes enter the first collecting groove 806, the second collecting groove 807 and the third collecting groove 808 respectively, and when the user needs to take out the collected metal particles, the collecting box 805 is pulled to take out the metal particles.

[0029] As shown in Figures 1 to 11 The limiting mechanism 9 comprises an extension frame 901, a limiting plate 902 and a limiting rod 903, the extension frame 901 is fixed outside the collecting box 805, the inside of the extension frame 901 is movably connected with the limiting plate 902, the outside of the limiting plate 902 is fixed with the limiting rod 903, the limiting plate 902 and the extension frame 901 are slidably connected, the limiting plate 902 is provided with two groups, the limiting plate 902 is symmetrically distributed about the central axis of the extension frame 901, the limiting plate 902 is provided with four groups, the limiting rod 903 is symmetrically distributed about the central axis of the limiting plate 902, the outside of the limiting plate 902 is fixed with a rack 904, the inside of the extension frame 901 is rotatably connected with a gear 905, the top end of the gear 905 is fixed with a torsion disc 906, the outer wall of the rack 904 is provided with teeth, the outer wall of the gear 905 is provided with a plurality of groups of teeth, and the rack 904 and the gear 905 are meshingly connected.

[0030] By adopting the above scheme: after the collecting box 805 is inserted into the collector 801, in order to ensure the firmness of the installation of the collecting box 805, the torsion disc 906 is rotated to drive the gear 905 to rotate, so that the gear 905 drives the two groups of racks 904 and limiting plates 902 to expand when the gear 905 rotates, and then the limiting rod 903 is inserted into the limiting holes opened between the two groups of collectors 801, and then the collecting box 805 is limited.

[0031] The working principle and use process of the present application: when cutting metal by using the cutting assembly 3, start the air cylinder 5 to move the collecting cover 4 as a whole downward, so that the particle collecting port 601 is close to the cutting end, and then perform air suction after starting the air suction pump 603, use negative pressure to suck metal particles, and after the metal particles are sucked into the inside of the screening box 701 through the conveying pipe 604, screening is performed, after the metal particles are sucked into the inside of the screening box 701 through the conveying pipe 604, contact the screening plate 705, the large metal particles fall into the first metal particle collecting pipeline 702 after being screened by the screening plate 705 for collection, the medium-sized metal particles contact the screening mesh 707 after passing through the screening plate 705 and fall into the second metal particle collecting pipeline 703 for collection, at this time, the tiny metal particles fall into the third metal particle collecting pipeline 704 after passing through the screening mesh 707 for collection, thereby completing the screening and collection of metal particles, and after long-term use of the device, the surfaces of the screening plate 705 and the screening mesh 707 may accumulate metal particles, the servo motor 709 is started to drive the eccentric wheel 710 to rotate, the first arc plate 711 and the second arc plate 712 are extruded, thereby extruding the screening plate 705 and the screening mesh 707, and the first reset spring 706 and the second reset spring 708 are used for resetting, so that the screening plate 705 and the screening mesh 707 vibrate, thereby shaking off the metal particles attached to the surface, avoiding the generation of blockage to cause the screening efficiency to be too low, the metal particles of different sizes pass through the first collecting cavity 802, the second collecting cavity 803 and the third collecting cavity 804 and enter the first collecting groove 806, the second collecting groove 807 and the third collecting groove 808 respectively, when the user needs to take out the collected metal particles, pull the collecting box 805 to take out the metal particles, after the collecting box 805 is inserted into the collector 801, in order to ensure the firmness of the installation of the collecting box 805, the rotating twist disc 906 drives the gear 905 to rotate, so that the gear 905 rotates to drive the two sets of racks 904 and the limiting plates 902 to expand, thereby making the limiting rods 903 inserted into the limiting holes opened between the two sets of collectors 801, thereby limiting the collecting box 805.

[0032] The embodiments of the present embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A metal particle collecting device for an electric spark cutting machine, comprising a supporting base (1), characterized in that: A processing table (2) is installed on the top of the support base (1), a cutting assembly (3) is installed on the outside of the processing table (2), a collecting cover (4) is provided on the outside of the cutting assembly (3), a particle collecting mechanism (6) is installed on one end of the collecting cover (4), a cylinder (5) is fixed on the top of the collecting cover (4), a screening mechanism (7) is provided on one end of the particle collecting mechanism (6), a collecting mechanism (8) is installed on the outside of the collecting cover (4), and a limiting mechanism (9) is provided on one end of the collecting mechanism (8); The particle collecting mechanism (6) comprises a particle collecting port (601), a particle collecting cover (602) and an air suction pump (603); the particle collecting port (601) is fixed to the bottom end of the collecting cover (4); the output end of the particle collecting port (601) is connected to the particle collecting cover (602); and the output end of the particle collecting cover (602) is connected to the air suction pump (603); The screening mechanism (7) comprises a screening box (701), a first metal particle collection pipe (702), and a second metal particle collection pipe (703); the screening box (701) is fixed to the outside of the collection cover (4); the bottom end of the screening box (701) is connected to the first metal particle collection pipe (702); and the bottom end of the screening box (701) is connected to the second metal particle collection pipe (703); The collecting mechanism (8) comprises a collector (801) and a first collecting chamber (802); the collector (801) is fixed to the outside of the collecting cover (4); and the first collecting chamber (802) is provided at one end of the collector (801).

2. The metal particle collecting device for an electric spark cutting machine according to claim 1, characterized in that: The output end of the air suction pump (603) is connected to a delivery pipe (604), and two groups of particle collecting openings (601) are provided. The particle collecting openings (601) are symmetrically distributed about the central axis of the collecting cover (4).

3. The metal particle collecting device for an electric spark cutting machine according to claim 1, characterized in that: The input end of the screening box (701) is connected to a conveying pipe (604), the bottom end of the screening box (701) is connected to a third metal particle collection pipe (704), the interior of the screening box (701) is slidably connected to a screening plate (705), the exterior of the screening plate (705) is fixed with a first return spring (706), the interior of the screening box (701) is slidably connected to a screening net (707), the exterior of the screening net (707) is fixed with a second return spring (708), the interior of the screening box (701) is fixed with a servo motor (709), the top end of the servo motor (709) is fixed with an eccentric wheel (710), the top end of the screening plate (705) is fixed with a first arc plate (711), and the top end of the screening net (707) is fixed with a second arc plate (712).

4. The metal particle collecting device for an electric spark cutting machine according to claim 3, characterized in that: Two groups of the screening boxes (701) are provided, and the screening boxes (701) are symmetrically distributed about the central axis of the collecting cover (4). Four groups of the first return springs (706) are provided, and the first return springs (706) are used to squeeze the screening plate (705) and keep it moving inward. The screening plate (705) is provided as an inclined surface.

5. The metal particle collecting device for an electric spark cutting machine according to claim 3, characterized in that: Four groups of the second return springs (708) are provided. The second return springs (708) are used to squeeze the screening mesh (707) and keep it moving inward. The screening plate (705) and the screening mesh (707) are symmetrically distributed. The first arc plate (711) and the second arc plate (712) are symmetrically distributed about the central axis of the servo motor (709).

6. The metal particle collecting device for an electric spark cutting machine according to claim 1, characterized in that: A second collecting chamber (803) is provided at one end of the collector (801), a third collecting chamber (804) is provided at one end of the collector (801), a collecting box (805) is slidably connected to the interior of the collector (801), a first collecting trough (806) is fixed to the exterior of the collecting box (805), a second collecting trough (807) is fixed to the exterior of the collecting box (805), and a third collecting trough (808) is fixed to the exterior of the collecting box (805).

7. The metal particle collecting device for an electric spark cutting machine according to claim 6, characterized in that: The collectors (801) are provided in two groups. The collectors (801) are symmetrically distributed about the central axis of the collection cover (4). The outer wall of the collection box (805) fits the inner wall of the collector (801). The collection box (805) and the collector (801) are slidably connected. The first collection chamber (802), the second collection chamber (803) and the third collection chamber (804) are distributed in an array. The first collection trough (806), the second collection trough (807) and the third collection trough (808) are distributed in an array.

8. The metal particle collecting device for an electric spark cutting machine according to claim 1, characterized in that: The limiting mechanism (9) comprises an extension frame (901), a limiting plate (902) and a limiting rod (903); the extension frame (901) is fixed to the outside of the collection box (805); the interior of the extension frame (901) is movably connected to the limiting plate (902); the limiting rod (903) is fixed to the outside of the limiting plate (902); a rack (904) is fixed to the outside of the limiting plate (902); the interior of the extension frame (901) is rotatably connected to a gear (905); a torsion plate (906) is fixed to the top of the gear (905).

9. The metal particle collecting device for an electric spark cutting machine according to claim 8, characterized in that: The limiting plates (902) are slidably connected to the extension frame (901), two groups of the limiting plates (902) are provided, the limiting plates (902) are symmetrically distributed about the central axis of the extension frame (901), four groups of the limiting plates (902) are provided, and the limiting rods (903) are symmetrically distributed about the central axis of the limiting plates (902).

10. The metal particle collecting device for an electric spark cutting machine according to claim 8, characterized in that: The outer wall of the rack (904) is provided with teeth, and the outer wall of the gear (905) is provided with several groups of teeth, and the rack (904) and the gear (905) are meshed and connected.

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