Bottom shell blanking device for cosmetic pencil assembly

Abstract

The utility model discloses a bottom shell blanking device for cosmetic pencil assembly, which belongs to the technical field of cosmetic pencil assembly and comprises a rotating table, a hanger and a support frame. The hanging frame is located on the upper side of the rotating table and located on a first station, and the supporting frame is located on a second station. A plurality of groups of mounting assemblies for placing bottom cylinders are fixedly mounted on a rotating disc at the top of the rotating table in a circumferential array at equal intervals, a blanking mechanism is mounted on the hanging frame, and a pressing assembly is mounted on the pressing assembly; the discharging mechanism comprises a discharging assembly and a discharging assembly, the discharging assembly is installed on the upper side of the hanging frame, and the discharging assembly is installed on the lower side of the rotating table. And the blanking assembly and the pressing assembly are both located on the upper side of the rotating table and are aligned to the mounting assembly. By means of the mode, the phenomenon that a bottom cylinder in the discharging assembly cannot fall into the discharging assembly due to the bridging phenomenon is avoided; and the bottom cylinders in the blanking assembly sequentially fall into the mounting assembly, and the openings of the bottom cylinders falling into the mounting assembly face upwards, so that follow-up assembly is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of cosmetic brush assembly, in particular to a bottom shell blanking device for cosmetic brush assembly. Background Art

[0002] A cosmetic brush is made up of a variety of parts. When assembling the outer shell and inner core of a cosmetic brush, the base shell, inner core, sleeve and pen tip are usually assembled in this order. In order to improve assembly efficiency, machines are currently used for automatic assembly.

[0003] For example, Chinese patent CN210908805U discloses a cosmetic pen tip assembly machine, which transports parts through a linear vibrator, drives the air clamp to pick up, move and discharge materials through a slide and a cylinder, and assembles them in sequence on a turntable.

[0004] However, the process of conveying parts through linear vibrators and driving air clamps to pick up, move and discharge materials through slides and cylinders is cumbersome and requires a large space distance.

[0005] Based on this, the present invention designs a bottom shell blanking device for assembling cosmetic brushes to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a bottom shell blanking device for assembling cosmetic brushes.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A bottom shell blanking device for assembling cosmetic brushes, comprising a rotating table, a hanging rack and a supporting rack;

[0009] The hanging bracket is located on the upper side of the rotating table, the hanging bracket is located at the first working position, and the supporting bracket is located at the second working position;

[0010] A plurality of mounting components for placing the bottom cylinder are fixedly installed in a circular array with equal intervals on the rotating disk at the top of the rotating table, a blanking mechanism is installed on the hanging bracket, and a pressing component is installed on the supporting frame;

[0011] The blanking mechanism includes a blanking assembly and a blanking assembly. The blanking assembly is installed on the upper side of the hanger, and the blanking assembly is installed on the lower side of the hanger. The blanking assembly and the pressing assembly are both located on the upper side of the rotating table and aligned with the mounting assembly.

[0012] Furthermore, the mounting assembly includes a fixing block and a mounting groove. The two fixing blocks are fixedly mounted on the rotating table. The upper side of the fixing block is provided with a mounting groove, and the diameter of the mounting groove is larger than the diameter of the bottom cylinder.

[0013] Furthermore, the unloading assembly includes a motor, a disc, a connecting rod, a slider, a guide rail and a mobile bin. The motor is fixedly mounted on the front side of the hanger, and the output end of the motor passes through the hanger and is fixedly connected to the middle of the disc. The edge of the disc is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the slider; the guide rail is fixedly mounted on the rear side of the hanger, and the slider is limitedly and slidably connected to the guide rail; a mobile bin for accommodating the bottom barrel is fixedly mounted on the rear side of the slider; the thickness of the mobile bin is consistent with the length of the bottom barrel, and a material guide ramp is symmetrically provided on the lower side of the mobile bin, and a material unloading port is provided at the bottom of the mobile bin; the bottom barrel inside the mobile bin opens backward.

[0014] Furthermore, the blanking assembly includes a material guide assembly and a control assembly, the guide assembly is installed on the hanging rack, and the control assembly is installed on the material guide assembly and the hanging rack.

[0015] Furthermore, the material guide assembly includes a mounting block, a material accumulation trough, a material blanking trough and a guide groove. The mounting block is fixedly mounted on the lower side of the hanger. The mounting block is symmetrically provided with two groups of material accumulation troughs, material blanking troughs and guide grooves from top to bottom. The material accumulation troughs, material blanking troughs and guide grooves are connected; the upper opening of the material accumulation trough is located between the material blanking troughs at the bottom of the mobile bin, and the distance between the two material accumulation troughs is consistent with the distance between the fixed blocks of the same group; the bottom of the guide groove is aligned with the fixed block, and the diameter of the guide groove is consistent with the diameter of the bottom cylinder.

[0016] Furthermore, the control component includes a baffle, a push rod, a movable plate, a baffle and a movable groove, and the baffle is fixedly installed on the rear side of the bottom of the material accumulation trough; the push rod is fixedly installed on the hanging bracket, and the movable plate is fixedly installed on the output end of the push rod, and two groups of blanking plates are installed on the left and right sides of the movable plate. The blanking plate is composed of two baffles, the height between the two baffles is consistent with the diameter of the bottom cylinder, and the horizontal distance between the two baffles is consistent with the diameter of the bottom cylinder. Two groups of movable grooves for accommodating baffles are opened on the front side of the bottom of the material accumulation trough, and the baffles are limitedly slidably connected to the movable grooves.

[0017] Furthermore, the downward pressure assembly includes a push cylinder, a positioning pressure rod and a limit assembly. The push cylinder is fixedly installed on the support frame, and the output end of the push cylinder is symmetrically fixed with a positioning pressure rod, which is aligned with the installation groove; the limit assembly is installed on the support frame.

[0018] Furthermore, the limiting assembly includes a stop block and a mounting plate, a stop block is fixedly installed on the middle part of the positioning pressure rod, the mounting plate is fixedly installed on the support frame, and the mounting plate is located on the lower side of the push cylinder; through holes are symmetrically opened on the mounting plate, the through holes are slidingly connected to the positioning pressure rod, and the mounting plate abuts against the stop block; the distance between the bottom of the stop block and the bottom of the positioning pressure rod is consistent with the distance between the top surface of the mounting plate and the bottom of the bottom cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The blanking assembly moves horizontally on the upper side of the blanking assembly to transfer the bottom tube in the blanking assembly into the blanking assembly; the blanking assembly moves on the blanking assembly to avoid bridging of the bottom tube in the blanking assembly and prevent it from falling into the blanking assembly, ensuring that the blanking assembly is always full of bottom tubes, thereby improving the accuracy of blanking; the bottom tube that falls into the blanking assembly falls into the installation assembly in turn under the guidance and control of the blanking assembly, and the opening of the bottom tube that falls into the installation assembly faces upward, which is convenient for subsequent assembly; such a blanking device process is simple and does not require a large space for conveying distance; the rotating table drives the bottom tube to the second station through the installation assembly, and presses the bottom tube in the installation assembly through the pressing assembly to position the bottom tube, so that the position of the bottom tube is more accurate, which is convenient for subsequent assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 This is a three-dimensional diagram of a bottom shell blanking device for assembling cosmetic brushes according to the present invention;

[0023] Figure 2 This is a front view of a bottom shell blanking device for assembling cosmetic brushes according to the present invention;

[0024] Figure 3 This is a three-dimensional diagram of a bottom shell blanking device for assembling cosmetic brushes according to the present invention with some components removed;

[0025] Figure 4 Schematic diagram of the rack and its connection structure;

[0026] Figure 5 Schematic diagram of the motor and its connection structure;

[0027] Figure 6 This is a schematic diagram of the internal structure of the installation block and mobile warehouse.

[0028] The numbers in the figure represent:

[0029] 1. Rotating table; 2. Hanging bracket; 3. Support frame; 4. Mounting assembly; 41. Fixed block; 42. Mounting slot; 5. Blanking mechanism; 51. Blanking assembly; 511. Motor; 512. Disc; 513. Connecting rod; 514. Slider; 515. Guide rail; 516. Moving bin; 52. Blanking assembly; 521. Mounting block; 522. Accumulation trough; 523. Blanking trough; 524. Guide slot; 525. Stop platform; 526. Push rod; 527. Moving plate; 528. Baffle; 529. Moving slot; 6. Pressing assembly; 61. Push cylinder; 62. Positioning pressure rod; 63. Stop block; 64. Mounting plate; 7. Bottom cylinder. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0032] Example 1

[0033] In some embodiments, please refer to the appendix of the specification. Figure 1-3 , a bottom shell blanking device for assembling cosmetic brushes, comprising a rotating table 1, a hanging rack 2 and a supporting rack 3;

[0034] The rotating table 1 is provided with eight workstations from one to eight in a counterclockwise direction, wherein the rear side of the rotating table 1 is provided with the first workstation;

[0035] The hanger 2 is located on the upper side of the rotating table 1, the hanger 2 is located at the first station, and the support frame 3 is located at the second station;

[0036] A plurality of mounting assemblies 4 for placing bottom cylinders 7 are fixedly mounted in a circular array and at equal intervals on the rotating disk at the top of the rotating table 1. A blanking mechanism 5 is mounted on the hanging bracket 2, and a pressing assembly 6 is mounted on the supporting frame 3.

[0037] The blanking mechanism 5 includes a blanking assembly 51 and a blanking assembly 52. ​​The blanking assembly 51 is installed on the upper side of the hanger 2, and the blanking assembly 52 is installed on the lower side of the hanger 2; the blanking assembly 52 and the pressing assembly 6 are both located on the upper side of the rotating table 1 and aligned with the mounting assembly 4.

[0038] When the bottom shell blanking device for assembling cosmetic brushes is working normally, the rotating table 1 drives the mounting assembly 4 to rotate, so that the empty mounting assembly 4 moves to the lower side of the blanking assembly 52; at the first station, the blanking assembly 51 moves horizontally on the upper side of the blanking assembly 52 to transfer the bottom cylinder 7 in the blanking assembly 51 into the blanking assembly 52; the blanking assembly 51 moves on the blanking assembly 52 to avoid bridging of the bottom cylinder 7 in the blanking assembly 51 and preventing it from falling into the blanking assembly 52, ensuring that the blanking assembly 52 is always full of the bottom cylinder 7, thereby improving the blanking accuracy; the bottom cylinder 7 that falls into the blanking assembly 52 falls into the mounting assembly 4 in turn under the guidance and control of the blanking assembly 52, and the bottom cylinder 7 that falls into the mounting assembly 4 opens upward, which is convenient for subsequent assembly; the rotating table 1 drives the bottom cylinder 7 to move to the second station through the mounting assembly 4, and presses the bottom cylinder 7 in the mounting assembly 4 by the pressing assembly 6 to position the bottom cylinder 7, so that the position of the bottom cylinder 7 is more accurate, which is convenient for subsequent assembly.

[0039] Example 2

[0040] In some embodiments, as Figure 1-6 As shown in FIG. 1 , as a preferred embodiment of the present invention, the mounting assembly 4 includes a fixing block 41 and a mounting groove 42 . The two fixing blocks 41 are fixedly mounted on the rotating table 1 . The fixing blocks 41 have a mounting groove 42 on their upper sides. The diameter of the mounting groove 42 is larger than the diameter of the bottom cylinder 7 .

[0041] The blanking assembly 51 includes a motor 511, a disc 512, a connecting rod 513, a slider 514, a guide rail 515 and a movable bin 516. The motor 511 is fixedly mounted on the front side of the hanger 2, and the output end of the motor 511 passes through the hanger 2 and is fixedly connected to the middle of the disc 512. The edge of the disc 512 is rotatably connected to one end of the connecting rod 513, and the other end of the connecting rod 513 is rotatably connected to the slider 514; the rear side of the hanger 2 is fixedly mounted with a guide rail 515, and the slider 514 is limitedly slidably connected to the guide rail 515; the rear side of the slider 514 is fixedly mounted with a movable bin 516 for accommodating the bottom cylinder 7; the thickness of the movable bin 516 is consistent with the length of the bottom cylinder 7, and a material guide ramp is symmetrically provided on the lower side of the movable bin 516, and a blanking port is provided at the bottom of the movable bin 516; the bottom cylinder 7 inside the movable bin 516 opens backward;

[0042] The blanking assembly 52 includes a material guide assembly and a control assembly, the guide assembly is mounted on the hanger 2, and the control assembly is mounted on the material guide assembly and the hanger 2;

[0043] The material guide assembly includes a mounting block 521, a material accumulation trough 522, a material blanking trough 523 and a guide groove 524. The mounting block 521 is fixedly mounted on the lower side of the hanger 2. The mounting block 521 is symmetrically provided with two groups of material accumulation troughs 522, material blanking troughs 523 and guide grooves 524 from top to bottom. The material accumulation troughs 522, material blanking troughs 523 and guide grooves 524 are connected. The upper opening of the material accumulation trough 522 is located between the material blanking troughs at the bottom of the movable bin 516. The distance between the two material accumulation troughs 522 is consistent with the distance between the fixed blocks 41 of the same group. The bottom of the guide groove 524 is aligned with the fixed block 41, and the diameter of the guide groove 524 is consistent with the diameter of the bottom cylinder 7.

[0044] The control component includes a baffle 525, a push rod 526, a movable plate 527, a baffle 528 and a movable groove 529. The baffle 525 is fixedly installed on the rear side of the bottom of the material accumulation trough 522; the push rod 526 is fixedly installed on the hanger 2, and the movable plate 527 is fixedly installed on the output end of the push rod 526. Two groups of blanking plates are installed on the left and right sides of the movable plate 527. The blanking plates are composed of two baffles 528. The height between the two baffles 528 is consistent with the diameter of the bottom cylinder 7, and the horizontal distance between the two baffles 528 is consistent with the diameter of the bottom cylinder 7. Two groups of movable grooves 529 for accommodating baffles 528 are opened on the front side of the bottom of the material accumulation trough 522. The baffles 528 and the movable grooves 529 are limitedly slidably connected.

[0045] The pressing assembly 6 includes a push cylinder 61, a positioning rod 62 and a limit assembly. The push cylinder 61 is fixedly mounted on the support frame 3. The output end of the push cylinder 61 is symmetrically fixedly mounted with a positioning rod 62, which is aligned with the mounting groove 42. The limit assembly is mounted on the support frame 3.

[0046] The limiting assembly includes a stopper 63 and a mounting plate 64. The stopper 63 is fixedly installed in the middle of the positioning pressure rod 62. The mounting plate 64 is fixedly installed on the support frame 3. The mounting plate 64 is located on the lower side of the push cylinder 61. Through holes are symmetrically opened on the mounting plate 64. The through holes are slidingly connected with the positioning pressure rod 62. The mounting plate 64 abuts against the stopper 63. The distance between the bottom of the stopper 63 and the bottom of the positioning pressure rod 62 is consistent with the distance between the top surface of the mounting plate 64 and the bottom of the bottom tube 7.

[0047] In this embodiment, when the mounting assembly 4, the blanking mechanism 5 and the pressing assembly 6 are working normally, the motor 511 drives the disc 512 to rotate, and the rotation of the disc 512 drives the slider 514 to move back and forth in the horizontal direction on the guide rail 515 through the connecting rod 513, thereby driving the mobile bin 516 to move back and forth in the horizontal direction; the bottom cylinder 7 of the mobile bin 516 moves to the blanking port at the bottom of the mobile bin 516 under the guidance of the guide ramp at the lower side of the mobile bin 516, and the mobile bin 516 drives the bottom cylinder 7 in the mobile bin 516 to move back and forth in the horizontal direction, so that the bottom of the mobile bin 516 The bottom cylinder 7 in the blanking port moves on the mounting block 521 and the top of the material accumulating trough 522; the bottom cylinder 7 at the bottom of the mobile bin 516 falls into the material accumulating trough 522; the bottom cylinder 7 accumulates in the material accumulating trough 522, and the bottom cylinder 7 at the bottom of the material accumulating trough 522 is blocked by the stop 525 and the baffle 528 on the lower side; the hanger 2 drives the fixed block 41 and the mounting groove 42 to rotate to the first position, and after the mounting groove 42 is aligned with the guide groove 524, the push rod 526 drives the baffle 528 to move horizontally through the moving plate 527, so that the upper baffle 528 is inserted into the upper side of the bottom cylinder 7 at the bottom of the material accumulating trough 522 , blocking the bottom tube 7 except the bottom tube 7 at the bottom of the accumulation trough 522 from moving downward; at the same time, the baffle 528 on the lower side no longer blocks the bottom tube 7 at the bottom of the accumulation trough 522, and the front side of the bottom tube 7 at the bottom of the accumulation trough 522 loses support and rotates downward, so that the accumulation trough 522 maintains an upward opening posture and falls downward into the guide groove 524 in the drop trough 523. The bottom tube 7 is guided by the guide groove 524 so that the opening of the bottom tube 7 falls vertically upward into the installation groove 42; the push rod 526 drives the baffle 528 to reset through the moving plate 527, so that the bottom tube 7 blocked by the upper baffle 528 falls To the lower side baffle 528; the hanger 2 drives the bottom cylinder 7 to move to the second workstation through the fixing block 41 and the mounting groove 42. After the bottom cylinder 7 is aligned with the positioning pressure rod 62, the push cylinder 61 drives the positioning pressure rod 62 and the stop block 63 to move downward, so that the positioning pressure rod 62 is inserted into the opening of the bottom cylinder 7 until the positioning pressure rod 62 contacts the inner bottom of the bottom cylinder 7 and pushes the bottom cylinder 7 to move downward, so that the bottom cylinder 7 remains vertical and the bottom contacts the bottom of the mounting groove 42. At this time, the bottom of the stop block 63 rests on the top surface of the mounting plate 64, thereby preventing the vertical movement transition of the positioning pressure rod 62 from damaging the bottom cylinder 7.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bottom shell blanking device for assembling cosmetic brushes, comprising a rotating table (1), a hanging frame (2) and a supporting frame (3), characterized in that: The hanger (2) is located on the upper side of the rotating table (1), the hanger (2) is located at a first working position, and the support frame (3) is located at a second working position; A plurality of mounting components (4) for placing bottom cylinders (7) are fixedly mounted at equal intervals in a circular array on the top rotating disk of the rotating table (1); a material dropping mechanism (5) is mounted on the hanging frame (2); and a pressing component (6) is mounted on the supporting frame (3); The blanking mechanism (5) comprises a blanking assembly (51) and a blanking assembly (52); the blanking assembly (51) is mounted on the upper side of the hanger (2), and the blanking assembly (52) is mounted on the lower side of the hanger (2); the blanking assembly (52) and the pressing assembly (6) are both located on the upper side of the rotating table (1) and aligned with the mounting assembly (4).

2. The bottom shell blanking device for cosmetic pen assembly according to claim 1, characterized in that: The mounting assembly (4) comprises a fixing block (41) and a mounting groove (42). The two fixing blocks (41) are fixedly mounted on the rotating platform (1). The fixing blocks (41) are provided with a mounting groove (42) on their upper sides. The diameter of the mounting groove (42) is greater than the diameter of the bottom cylinder (7).

3. The bottom shell blanking device for cosmetic brush assembly according to claim 2, characterized in that: The unloading assembly (51) comprises a motor (511), a disc (512), a connecting rod (513), a slider (514), a guide rail (515) and a movable bin (516); the motor (511) is fixedly mounted on the front side of the hanger (2); the output end of the motor (511) passes through the hanger (2) and is fixedly connected to the middle of the disc (512); the edge of the disc (512) is rotatably connected to one end of the connecting rod (513); the other end of the connecting rod (513) is rotatably connected to the slider (514); The hanging bracket (2) is connected to the bottom tube (7) by a movable connection; a guide rail (515) is fixedly installed on the rear side of the hanging bracket (2); the slider (514) is connected to the guide rail (515) in a limited sliding manner; a mobile bin (516) for accommodating the bottom tube (7) is fixedly installed on the rear side of the slider (514); the thickness of the mobile bin (516) is consistent with the length of the bottom tube (7); a material guide ramp is symmetrically arranged on the lower side of the mobile bin (516); a material drop opening is opened at the bottom of the mobile bin (516); the bottom tube (7) inside the mobile bin (516) opens backwards.

4. The bottom shell blanking device for cosmetic brush assembly according to claim 3, characterized in that: The blanking assembly (52) comprises a material guiding assembly and a control assembly, the guiding assembly is mounted on the hanging rack (2), and the control assembly is mounted on the material guiding assembly and the hanging rack (2).

5. The bottom shell blanking device for cosmetic brush assembly according to claim 4, characterized in that: The material guide assembly comprises a mounting block (521), a material accumulation groove (522), a material drop groove (523) and a guide groove (524); the mounting block (521) is fixedly mounted on the lower side of the hanger (2); the mounting block (521) is symmetrically provided with two groups of material accumulation grooves (522), material drop grooves (523) and guide grooves (524) from top to bottom; the material accumulation grooves (522), material drop grooves (523) and guide grooves (524) are connected; the upper opening of the material accumulation groove (522) is located between the material drop grooves at the bottom of the mobile bin (516); the distance between the two material accumulation grooves (522) is consistent with the distance between the fixed blocks (41) of the same group; the bottom of the guide groove (524) is aligned with the fixed block (41), and the diameter of the guide groove (524) is consistent with the diameter of the bottom cylinder (7).

6. The bottom shell blanking device for cosmetic brush assembly according to claim 5, characterized in that: The control assembly comprises a baffle (525), a push rod (526), ​​a movable plate (527), a baffle (528) and a movable groove (529); the baffle (525) is fixedly installed on the rear side of the bottom of the material accumulation groove (522); the push rod (526) is fixedly installed on the hanger (2); the movable plate (527) is fixedly installed on the output end of the push rod (526); two groups of blanking plates are installed on the left and right sides of the movable plate (527); the blanking plates are composed of two baffles (528); the height between the two baffles (528) is consistent with the diameter of the bottom cylinder (7); the horizontal distance between the two baffles (528) is consistent with the diameter of the bottom cylinder (7); two groups of movable grooves (529) for accommodating the baffles (528) are opened on the front side of the bottom of the material accumulation groove (522); the baffles (528) and the movable grooves (529) are limitedly slidably connected.

7. The bottom shell blanking device for cosmetic pen assembly according to claim 6, characterized in that: The pressing assembly (6) comprises a push cylinder (61), a positioning pressure rod (62) and a limit assembly. The push cylinder (61) is fixedly mounted on the support frame (3). The output end of the push cylinder (61) is symmetrically fixedly mounted with a positioning pressure rod (62). The positioning pressure rod (62) is aligned with the mounting groove (42). The limit assembly is mounted on the support frame (3).

8. The bottom shell blanking device for cosmetic brush assembly according to claim 7, characterized in that: The limiting assembly comprises a stopper (63) and a mounting plate (64); the stopper (63) is fixedly mounted in the middle of the positioning rod (62); the mounting plate (64) is fixedly mounted on the support frame (3); the mounting plate (64) is located at the lower side of the push cylinder (61); through holes are symmetrically provided on the mounting plate (64); the through holes are slidably connected to the positioning rod (62); the mounting plate (64) abuts against the stopper (63); the distance between the bottom of the stopper (63) and the bottom of the positioning rod (62) is consistent with the distance between the top surface of the mounting plate (64) and the bottom of the bottom cylinder (7).

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