A portable multi-functional sample pretreatment device

Abstract

The present invention provides a portable multi-functional sample pretreatment device, comprising: a housing, and a control unit, a centrifugal turntable, and a sliding unit located inside the housing. The centrifugal turntable is fixed to the upper part of the control unit through the inner wall of the housing, so that the upper part of the control unit is inserted into the hollow part of the centrifugal turntable. An intermediate gear is sleeved on the motor output shaft of the control unit, and the rotation of the intermediate gear drives the sliding unit to perform a linear reciprocating motion, so that the materials in the test tube on the sliding unit are mixed or ground. Wherein, the control unit is used to control the centrifugal turntable and the sliding unit to be started and stopped simultaneously. The advantages are as follows: By starting the motor, the materials in the test tube can be centrifuged, mixed or centrifuged and ground at the same time, which saves time and effort, reduces costs and has high efficiency. Moreover, the structure of the present invention is small and portable, and has strong applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of pretreatment of agricultural samples, and specifically relates to a portable multi-functional sample pretreatment device. Background Art

[0002] In the research process of agricultural materials, it is usually necessary to first mix, centrifuge or grind the materials, and then perform subsequent test operations. However, if the existing equipment with the above-mentioned functions is integrated, it is necessary to start the motor to run successively, with low efficiency and time-consuming; if it is split, it is necessary to place the equipment with the above three functions at the same time, which occupies a large area, is inconvenient to carry, and has a high cost.

[0003] Therefore, there is an urgent need to provide a device that integrates centrifugation, mixing, and grinding and is easy to carry. Summary of the Invention

[0004] The present invention provides a portable multi-functional sample pretreatment device that integrates centrifugation, mixing, and grinding. During use, two functions can be simultaneously realized by starting the motor, saving time and space, and effectively reducing costs.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] A portable multi-functional sample pretreatment device, comprising: a housing and a control unit, a centrifugal turntable, and a sliding unit located inside the housing. The centrifugal turntable is fixed to the upper part of the control unit through the inner wall of the housing, so that the upper part of the control unit is inserted into the hollow part of the centrifugal turntable; an intermediate gear is sleeved on the motor output shaft of the control unit, and the sliding unit is driven to perform a linear reciprocating motion through the rotation of the intermediate gear, so that the materials in the test tube on the sliding unit are mixed or ground.

[0007] Wherein, the control unit is used to control the centrifugal turntable and the sliding unit to be started and stopped simultaneously.

[0008] Preferably, the centrifugal turntable includes a rotating bracket and a rotating disk fixedly connected to the bottom of the rotating bracket. The rotating bracket is in an inverted U shape, and a sleeve coaxial with the motor output shaft is vertically provided on the inner wall of the top of the rotating bracket, so that the upper part of the motor output shaft is inserted into the sleeve, and the centrifugal turntable is driven to rotate through the rotation of the motor output shaft.

[0009] Wherein, the hollow part is located on the rotating disk, and the rotating disk is provided with a plurality of test tube holes for placing test tubes at equal intervals along its circumferential direction.

[0010] Preferably, the upper end surface of the rotating disk is provided with a plurality of equally spaced convex platforms, and the test tube holes are opened on the convex platforms.

[0011] Wherein, the angle formed between the test tube hole and the diameter on the rotating disk is an acute angle.

[0012] Preferably, the sliding unit comprises a mounting base, a driven gear, an eccentric wheel, a central shaft, a sliding grinding frame, and a test tube placement table, wherein the mounting base is fixed on the control assembly and is located at the lower part of the intermediate gear, so that one end of the central shaft is vertically fixed on the upper surface of the mounting base, so that the driven gear and the eccentric wheel are sequentially inserted into the central shaft from bottom to top, the driven gear and the intermediate gear are located at the same height, and the eccentric wheel is opposite to the sliding grinding frame;

[0013] Among them, the centers of the sliding grinding frame and the test tube placement table both pass through the motor output shaft, and the test tube placement table is placed on the sliding grinding frame to form a cross shape; the central axis, the driven gear, and the eccentric wheel are each provided with two, and one central axis, one driven gear, and one eccentric wheel are set as a group to constitute a driven structure, so that the two groups of driven mechanisms are arranged in opposite directions on both sides of the intermediate gear, and the rotation of the motor output shaft drives the driven structures on both sides to move in the opposite direction, so that the test tube placement table makes a linear reciprocating motion along the length direction of the sliding grinding frame.

[0014] Preferably, the sliding grinding frame comprises a fixed seat, a grinding shaft, and a frame, wherein the grinding shaft is symmetrically arranged on both sides of the frame, and the other end of the grinding shaft is inserted into the fixed seat, the frame and the motor output shaft share a vertical center line, and the top of the motor output shaft extends out of the frame and is inserted into the sleeve;

[0015] The fixing seat is located on the mounting chassis, and the sliding grinding frame is located on the frame frame, so that the sliding grinding frame performs linear reciprocating motion along the length direction of the sliding grinding frame.

[0016] Preferably, the sliding grinding frame further comprises a sliding sleeve located in the fixed seat, and the end of the grinding shaft away from the frame passes through the sliding sleeve and then extends out of the fixed seat.

[0017] Preferably, a stop cover coaxial with the grinding shaft is provided on one end of the sliding sleeve close to the frame, and the outer diameter of the stop cover is larger than the outer diameter of the sliding sleeve, and the inner diameter is equal to the inner diameter of the sliding sleeve.

[0018] Preferably, the test tube placement table includes a test tube rack, a test tube pressing cover, and a connecting rod. A through hole for the output shaft of the motor to pass through is formed in the middle of the test tube rack, and a perforation is formed in the test tube rack along the length direction of the sliding grinding rack; one end of the connecting rod is fixed to the side wall of the test tube pressing cover, and the other end passes through the perforation and is fixed by a compression nut;

[0019] Among them, the test tube pressing cover faces one of the fixed seats. A plurality of test tube slots for placing test tubes are provided on the test tube rack along its width direction, and the openings of the test tubes face the side of the test tube pressing cover.

[0020] Preferably, the control unit includes a motor, a motor cover, a circuit board, and control buttons. The motor is located inside the motor cover, and its lower part is electrically connected to the circuit board. The control buttons are located on the outer shell and are electrically connected to the circuit board;

[0021] Among them, the installation chassis is fixed to the top of the motor cover, and the circuit board is fixedly connected to the outer shell.

[0022] A portable multi-functional sample pretreatment device of the present invention has the following advantages:

[0023] 1. For the device designed by the present invention, the materials in the test tube can be centrifuged, mixed, or centrifuged and ground by turning on the motor at the same time, which saves time and effort, reduces costs, and has high efficiency; moreover, the structure of the present invention is small and portable, with strong applicability;

[0024] 2. The designed position and structure of the centrifugal turntable in the device of the present invention enable the centrifugal turntable and the sliding unit to work without affecting each other, and it is convenient to put in and take out the test tubes;

[0025] 3. The structural design of the convex platform effectively reduces the overall weight of the device;

[0026] 4. In the sliding unit, through the opposite setting of the driven structure, it makes a linear reciprocating motion to achieve the purpose of mixing or grinding;

[0027] 5. The structural design of the sliding grinding rack drives the test tube placement table to make a linear reciprocating motion, and at the same time prevents the test tube placement table from sliding out. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are used to provide a further understanding of the present invention, and together with the description form a part of the specification to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0029] Figure 1 is a three-dimensional structural schematic diagram of a portable multi-functional sample pretreatment device of the present invention;

[0030] Figure 2Schematic diagram of the internal three-dimensional structure of a portable multi-functional sample pretreatment device of the present invention;

[0031] Figure 3 Schematic diagram of the three-dimensional structure of a portable multi-functional sample pretreatment device of the present invention after removing the outer shell and the rotating bracket, wherein no test tube is installed in the test tube slot;

[0032] Figure 4 Schematic diagram of the three-dimensional structure of a portable multi-functional sample pretreatment device of the present invention after removing the outer shell and the rotating bracket;

[0033] Figure 5 Schematic diagram of the three-dimensional structure of a portable multi-functional sample pretreatment device of the present invention after removing the outer shell, the rotating bracket, and the test tube placement table;

[0034] Figure 6 Partial structure schematic diagram of the sliding unit;

[0035] Figure 7 Partial three-dimensional structure schematic diagram of the connection between the control unit and the installation chassis;

[0036] Figure 8 Partial exploded structure schematic diagram of the control unit;

[0037] Figure 9 Connection structure schematic diagram of the sliding sleeve and the retaining cover;

[0038] Outer shell 10, upper shell 11, lower shell 12;

[0039] Control unit 20, motor output shaft 21, intermediate gear 22, motor 23, motor cover 24, circuit board 25, control button 26;

[0040] Centrifugal turntable 30, rotating bracket 31, rotating disk 32, sleeve 33, test tube hole 34, convex platform 35;

[0041] Sliding unit 40, installation chassis 41, driven gear 42, eccentric wheel 43, central shaft 44, sliding grinding frame 45, fixed seat 451, grinding shaft 452, frame-shaped frame 453, sliding sleeve 454, retaining cover 455, test tube placement table 46, test tube rack 461, test tube pressing cover 462, connecting rod 463, through hole 464, perforation 465, compression nut 466, test tube slot 467;

[0042] Test tube 50. Specific embodiments

[0043] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] According toFigures 1-4 As shown in Figures 1-4 , a portable multi-functional sample pretreatment device of the present invention includes: a housing 10, and a control unit 20, a centrifugal turntable 30, and a sliding unit 40 located inside the housing 10. When the device is not in use, due to the setting of the housing 10, dust can be prevented from entering, and at the same time, the structures inside the housing 10 can be protected, which is also convenient for operations such as carrying and transportation.

[0045] The centrifugal turntable 30 is fixed to the upper part of the control unit 20 through the inner wall of the housing 10, so that the upper part of the control unit 20 is inserted into the hollow part of the centrifugal turntable 30; an intermediate gear 22 is sleeved on the motor output shaft 21 of the control unit 20, and the rotation of the intermediate gear 22 drives the sliding unit 40 to perform a linear reciprocating motion, so that the materials in the test tube on the sliding unit 40 are mixed or ground; in this specific embodiment, the control unit 20 is used to control the centrifugal turntable 30 and the sliding unit 40 to start and stop simultaneously. The centrifugal turntable 30 is used to perform centrifugation operations on the materials in the test tubes thereon; the sliding unit 40 is used to mix or grind the materials contained in the test tubes thereon. When grinding operations are required, grinding beads need to be placed in the test tubes at the same time.

[0046] More specifically, the housing 10 includes an upper housing 11 and a lower housing 12 that is rotatably connected to the upper housing 11, so that after the upper housing 11 and the lower housing 12 are screwed together, a receiving cavity for accommodating the control unit 20, the centrifugal turntable 30, and the sliding unit 40 is formed.

[0047] In a specific embodiment, according to Figures 2-5 As shown in Figures 2-5 , the centrifugal turntable 30 includes a rotating bracket 31 and a rotating disk 32 fixedly connected to the bottom of the rotating bracket 31. The rotating bracket 31 is in an inverted U shape, and a sleeve 33 coaxial with the motor output shaft 21 is vertically provided on the inner wall of its top, so that the upper part of the motor output shaft 21 is inserted into the sleeve 33, and the rotation of the motor output shaft 21 drives the centrifugal turntable 30 to rotate; in this embodiment, the design of the sleeve 33 can strengthen the protection of the motor output shaft 21 and at the same time prevent the rotating bracket 31 from being thrown out during the movement process; and the structure of the rotating bracket 31 and its connection method with the rotating disk 32 are convenient for taking out and putting in test tubes on the one hand, and convenient for observing the experimental situation on the other hand; wherein, the hollow part is located on the rotating disk 32, so that the motor output shaft 21 passes through the rotating disk 32. This design makes the structure of the device of the present invention more compact, and a plurality of test tube holes 34 for placing test tubes are equidistantly arranged along the circumferential direction of the rotating disk 32.

[0048] To reduce the weight of the device of the present invention and facilitate carrying, a plurality of equally spaced bosses 35 are provided on the upper end surface of the rotating disk 32, and the test tube holes 34 are formed on the bosses 35; the angle formed between the test tube holes 34 and the diameter on the rotating disk 32 is an acute angle, and the specific angle setting is determined according to requirements.

[0049] In a specific embodiment, according to Figures 2-6 As shown, the sliding unit 40 includes a mounting chassis 41, a driven gear 42, an eccentric wheel 43, a central shaft 44, a sliding grinding frame 45, and a test tube placement table 46. The mounting chassis 41 is fixed on the control unit 20 and is located below the intermediate gear 22, so that one end of the central shaft 44 is vertically fixed on the upper end surface of the mounting chassis 41, and the driven gear 42 and the eccentric wheel 43 are sequentially sleeved on the central shaft 44 from bottom to top. The driven gear 42 and the intermediate gear 22 are at the same height, so that when the intermediate gear 22 rotates, it drives the driven gear 42 to rotate. The eccentric wheel 43 faces the sliding grinding frame 45, so that when the eccentric wheel 43 rotates, it drives the sliding grinding frame 45 to move;

[0050] Wherein, the centers of the sliding grinding frame 45 and the test tube placement table 46 both pass through the motor output shaft 21, and the test tube placement table 46 is placed on the sliding grinding frame 45 and forms a cross shape in space, so that the sliding grinding frame 45 and the sliding grinding frame 45 achieve synchronous and co-directional movement; to achieve the reciprocating movement of the sliding unit 40 in a straight line, there are two central shafts 44, two driven gears 42, and two eccentric wheels 43. One central shaft 44, one driven gear 42, and one eccentric wheel 43 are set as a group to form a driven structure, so that the two driven mechanisms are arranged on both sides of the intermediate gear 22 in the opposite direction. By the rotation of the motor output shaft 21, the driven structures on both sides move in the opposite direction, so that the test tube placement table 46 makes a straight reciprocating movement along the length direction of the sliding grinding frame 45.

[0051] More specifically, the eccentric wheels 43 in the two sets of driven structures are arranged in opposite directions, and the other structures are symmetrically arranged. The eccentric wheel 43 can be a sector structure. During use, that is, the arc edge of the sector structure in one side of the driven structure pushes the sliding grinding frame 45 to move in one direction (that is, when the eccentric wheel 43 rotates within the meshing angle). At this time, the arc edge of the sector structure in the other side of the driven structure does not contact the sliding grinding frame 45 (that is, when the eccentric wheel 43 rotates outside the meshing angle). When the arc edge on this side of the eccentric wheel 43 contacts the sliding grinding frame 45, the sliding grinding frame 45 moves in the opposite direction. When the motor output shaft 21 completes a selection cycle, a vibration frequency corresponding to the rotation speed of the motor output shaft 21 is achieved for the test tube placement table 46, and then the functions of mixing or grinding (at this time, grinding beads are placed in the test tube) are realized.

[0052] In the specific implementation manner, according to Figures 2-6 , Figure 9 As shown, the sliding grinding frame 45 includes a fixed seat 451, a grinding shaft 452, and a frame-shaped frame 453. One grinding shaft 452 is symmetrically arranged on both sides of the frame-shaped frame 453, and the other end of the grinding shaft 452 is inserted into the fixed seat 451. The frame-shaped frame 453 and the motor output shaft 21 share a vertical center line, and the top of the motor output shaft 21 extends out of the frame-shaped frame 453 and is inserted into the sleeve 33. In this embodiment, half of the opening width of the frame-shaped frame 453 is equal to the stroke of the sliding grinding frame 45.

[0053] The fixed seat 451 is located on the installation chassis 41, and the sliding grinding frame 45 is located on the frame-shaped frame 453, so that the sliding grinding frame 45 makes a linear reciprocating motion along the length direction of the sliding grinding frame 45. The top surface of the fixed seat 451 is above the bottom surface of the sliding grinding frame 45 to prevent the sliding grinding frame 45 from slipping out during movement.

[0054] The fixed seat 451 and the installation chassis 41 can be connected by screws for easy disassembly.

[0055] In this embodiment, further, as shown in Figure 9 , the sliding grinding frame 45 further includes a sliding sleeve 454 located in the fixed seat 451. The end of the grinding shaft 452 facing away from the frame-shaped frame 453 passes through the sliding sleeve 454 and then extends out of the fixed seat 451. The installation and design of the sliding sleeve 454 make it more convenient for the grinding shaft 452 on the sliding grinding frame 45 to move under the power of the frame-shaped frame 453. At the same time, it is convenient to take out and install the grinding shaft 452 from the fixed seat 451, which is convenient for disassembly and assembly.

[0056] Further, a retaining cover 455 coaxial with the grinding shaft 452 is provided at one end of the sliding sleeve 454 close to the frame-shaped frame 453. The outer diameter of the retaining cover 455 is larger than that of the sliding sleeve 454, and the inner diameter is equal to that of the sliding sleeve 454, so as to reduce the damage to the fixed seat 451 during the movement of the test tube placing table 46 and extend its service life.

[0057] In the specific implementation manner, according to Figures 2-6 shown, the test tube placing table 46 includes a test tube rack 461, a test tube pressing cover 462, and a connecting rod 463. A through hole 464 for the output shaft 21 of the motor to pass through is formed in the middle of the test tube rack 461, and the shape of the through hole 464 is the same as the opening shape of the frame-shaped frame 453, so that the test tube placing table 46 moves synchronously, in the same direction, and with the same stroke as the sliding grinding rack 45, improving the mixing or grinding efficiency.

[0058] A perforation 465 is formed in the test tube rack 461 along the length direction of the sliding grinding rack 45; one end of the connecting rod 463 is fixed to the side wall of the test tube pressing cover 462, and the other end passes through the perforation 465 and is fixed by a compression nut 466;

[0059] Among them, the test tube pressing cover 462 faces one of the fixed seats 451. A plurality of test tube slots 467 for placing test tubes are provided on the test tube rack 461 along its width direction, and the openings of the test tubes face the side of the test tube pressing cover 462. After the test tube is placed in the test tube slot 467, the connecting rod 463 is inserted into the perforation 465, and at the same time, the open end of the test tube abuts against the inner side wall of the test tube pressing cover 462, and then the compression nut 466 is used to tighten the connecting rod 463 to prevent the test tube plug from being opened under the impact force during the movement of the test tube placing table 46.

[0060] In the specific implementation manner, according to Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 shown, the control unit 20 includes a motor 23, a motor cover 24, a circuit board 25, and a control button 26. The motor 23 is located inside the motor cover 24, and its lower part is electrically connected to the circuit board 25. The control button 26 is located on the outer shell 10 and is electrically connected to the circuit board 25; among them, the mounting chassis 41 is fixed to the top of the motor cover 24, and the circuit board 25 is fixedly connected to the outer shell 10.

[0061] In this embodiment, the control button 26 is used to control centrifugation, mixing, or centrifugation and grinding, and is located on the lower shell 12.

[0062] In the present invention, the test tube labels for centrifuging, mixing, and grinding the charged materials are all 50.

[0063] The structures and principles not clearly described in the present invention can be obtained by those skilled in the art according to conventional technical means. For example, the control unit, so they will not be elaborated here.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A portable multi-functional sample pretreatment device, characterized in that: it includes a housing (10) and a control unit (20), a centrifugal turntable (30), and a sliding unit (40) located inside the housing (10). The centrifugal turntable (30) is fixed to the upper part of the control unit (20) through the inner wall of the housing (10), so that the upper part of the control unit (20) is inserted into the hollow part of the centrifugal turntable (30); a middle gear (22) is sleeved on the motor output shaft (21) of the control unit (20), and the rotation of the middle gear (22) drives the sliding unit (40) to perform a linear reciprocating motion, so that the materials in the test tubes on the sliding unit (40) are mixed or ground; wherein, the control unit (20) is used to control the centrifugal turntable (30) and the sliding unit (40) to start simultaneously; The centrifugal turntable (30) includes a rotating bracket (31) and a rotating disk (32) fixedly connected to the bottom of the rotating bracket (31). The rotating bracket (31) is in an inverted U shape, and a sleeve (33) coaxial with the motor output shaft (21) is vertically provided on the inner wall of its top, so that the upper part of the motor output shaft (21) is inserted into the sleeve (33), and the rotation of the motor output shaft (21) drives the centrifugal turntable (30) to rotate; wherein, the hollow part is located on the rotating disk (32), and a plurality of test tube holes (34) for placing test tubes are equidistantly arranged along the circumferential direction of the rotating disk (32); The sliding unit (40) includes a mounting chassis (41), a driven gear (42), an eccentric wheel (43), a central shaft (44), a sliding grinding frame (45), and a test tube placement table (46). The mounting chassis (41) is fixed on the control unit (20) and is located below the middle gear (22), so that one end of the central shaft (44) is vertically fixed on the upper end face of the mounting chassis (41), and the driven gear (42) and the eccentric wheel (43) are sequentially sleeved on the central shaft (44) from bottom to top. The driven gear (42) and the middle gear (22) are at the same height, and the eccentric wheel (43) faces the sliding grinding frame (45); wherein, the centers of the sliding grinding frame (45) and the test tube placement table (46) both pass through the motor output shaft (21), and the test tube placement table (46) is placed on the sliding grinding frame (45) and forms a cross shape; there are two central shafts (44), two driven gears (42), and two eccentric wheels (43), and one central shaft (44), one driven gear (42), and one eccentric wheel (43) are set as a group to form a driven structure, so that the two driven mechanisms are arranged on both sides of the middle gear (22) in the opposite direction, and the rotation of the motor output shaft (21) drives the driven structures on both sides to move in the opposite direction, so that the test tube placement table (46) performs a linear reciprocating motion along the length direction of the sliding grinding frame (45).

2. A portable multifunctional sample pre-treatment device according to claim 1, Features: The upper end surface of the rotating disk (32) is provided with a plurality of bosses (35) arranged at equal intervals, and the test tube holes (34) are opened on the bosses (35); Wherein, the angle formed between the test tube hole (34) and the diameter on the rotating disk (32) is an acute angle.

3. A portable multifunctional sample pre-treatment device according to claim 1, Features: The sliding grinding frame (45) comprises a fixed seat (451), a grinding shaft (452), and a frame (453); a grinding shaft (452) is symmetrically provided on both sides of the frame (453), and the other end of the grinding shaft (452) is inserted into the fixed seat (451); the frame (453) and the motor output shaft (21) share a common vertical center line, and the top of the motor output shaft (21) extends out of the frame (453) and is inserted into the sleeve (33); The fixing seat (451) is located on the mounting chassis (41), and the sliding grinding frame (45) is located on the frame frame (453), so that the sliding grinding frame (45) performs linear reciprocating motion along the length direction of the sliding grinding frame (45).

4. A portable multifunctional sample pre-treatment device according to claim 3, Features: The sliding grinding frame (45) further comprises a sliding sleeve (454) located in the fixed seat (451), and an end of the grinding shaft (452) facing away from the frame (453) passes through the sliding sleeve (454) and then extends out of the fixed seat (451).

5. A portable multifunctional sample pre-treatment device according to claim 4, Features: A stop cover (455) co-centering with the grinding shaft (452) is provided on one end of the sliding sleeve (454) close to the frame (453), and the stop cover (455) has an outer diameter greater than the outer diameter of the sliding sleeve (454) and an inner diameter equal to the inner diameter of the sliding sleeve (454).

6. A portable multifunctional sample pre-treatment device according to claim 3, Features: The test tube placement table (46) comprises a test tube rack (461), a test tube pressure cover (462), and a connecting rod (463); a through hole (464) for the motor output shaft (21) to pass through is provided in the middle of the test tube rack (461); a through hole (465) is provided on the test tube rack (461) along the length direction of the sliding grinding frame (45); one end of the connecting rod (463) is fixed to the side wall of the test tube pressure cover (462), and the other end passes through the through hole (465) and is fixed by a clamping nut (466); The test tube cover (462) is opposite to one of the fixing seats (451), and the test tube rack (461) is provided with a plurality of test tube slots (467) for placing test tubes along its width direction, and the openings of the test tubes face one side of the test tube cover (462).

7. A portable multifunctional sample pre-treatment device according to claim 1, Features: The control unit (20) includes a motor (23), a motor cover (24), a circuit board (25), and a control button (26). The motor is located inside the motor cover, and its lower part is electrically connected to the circuit board (25). The control button (26) is located on the housing (10) and is electrically connected to the circuit board (25). Among them, the mounting chassis (41) is fixed to the top of the motor cover (24), and the circuit board (25) is fixedly connected to the housing (10).

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