Full-automatic fitting machine for deep groove ball bearing

Abstract

The invention relates to the technical field of bearing production, and discloses a deep groove ball bearing full-automatic sleeving machine which comprises a bearing table, a feeding unit, a feeding unit, a feeding unit and a feeding unit. The feeding unit comprises an outer ring feeding pipe and an inner ring feeding pipe, the outer ring feeding pipe and the inner ring feeding pipe are fixedly installed on the bearing table, the inner diameter of the outer ring feeding pipe is equal to the outer diameter of a bearing outer ring, and the inner diameter of the inner ring feeding pipe is equal to the outer diameter of a bearing inner ring; the fitting mechanism comprises a large disc and a small disc which are rotationally arranged on the bearing table, and the small disc is located on the upper side of the large disc. According to the bearing outer ring and bearing inner ring assembling device, the technical means that the feeding unit is matched with the assembling mechanism is adopted, a bearing outer ring and a bearing inner ring are pushed into a discharging hole in sequence through rotation of a large disc and a small disc in the same direction, the bearing outer ring and bearing inner ring assembling procedure is completed, the defects in the prior art are overcome, and the practicability of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing production, and more specifically, to a fully automatic deep groove ball bearing assembly machine. Background Art

[0002] Deep groove ball bearings are the most widely used rolling bearings due to their low friction resistance and high speed. They can be used on parts that bear radial loads or combined radial and axial loads, as well as parts that bear axial loads. Due to the large amount of deep groove ball bearings used, a device that can fully automatically produce deep groove ball bearings is needed.

[0003] Although the existing fully automatic deep groove ball bearing assembly machine can well complete the production of deep groove ball bearings with high production efficiency, in actual operation, since the existing technology uses a large number of cylinders as drive units, its cost is relatively high, and the overall equipment is large in size, complicated to operate, and has high requirements on site and personnel. At the same time, it increases the overall failure rate of the device and increases the overall manufacturing and maintenance costs. Summary of the invention

[0004] The invention discloses a fully automatic deep groove ball bearing assembly machine, which solves the technical problems of bearing production in related technologies.

[0005] The invention discloses a fully automatic deep groove ball bearing assembly machine, comprising: a bearing platform; A feeding unit is arranged on the bearing platform; the feeding unit comprises an outer ring feeding pipe and an inner ring feeding pipe fixedly mounted on the bearing platform, the inner diameter of the outer ring feeding pipe is equal to the outer diameter of the bearing outer ring, and the inner diameter of the inner ring feeding pipe is equal to the outer diameter of the bearing inner ring; A sleeve-fitting mechanism is arranged on the bearing platform; the sleeve-fitting mechanism comprises a large disc and a small disc rotatably arranged on the bearing platform, and the small disc is located on the upper side of the large disc, the discharge end of the outer ring feed pipe is arranged on the upper side of the large disc, the discharge end of the inner ring feed pipe is arranged on the upper side of the small disc, a first feed hole is penetrated on the large disc, a second feed hole is penetrated on both the large disc and the small disc, and a discharge hole is penetrated on the bearing platform; The moving assembly is arranged on the bearing platform and is used for driving the large disc and the small disc to rotate in the same direction.

[0006] Preferably, the moving component includes two rotating shafts rotatably connected to the supporting platform, the two rotating shafts are respectively fixedly connected to the large disc or the small disc, and the upper ends of the two rotating shafts are fixedly connected with synchronous wheels, and the two synchronous wheels are matched through a synchronous belt transmission, and the lower surface of the supporting platform is fixedly installed with a driving device for driving one of the rotating shafts to rotate.

[0007] Preferably, the driving device is configured as a servo motor, and an output shaft of the servo motor is fixedly connected to one of the rotating shafts.

[0008] Preferably, a positioning unit is provided on the supporting platform, and the positioning unit includes a slide fixedly installed on the supporting platform, the slide is arranged directly below the discharge hole, and a positioning block is fixedly connected to the side of the slide away from the supporting platform, and a positioning groove is provided on the positioning block. The slide is inclined at a first set angle, and the positioning block is inclined at a second set angle, and the first set angle is greater than the second set angle.

[0009] Preferably, a bead supply unit is provided on the bearing platform, and the bead supply unit comprises an automatic bead separator fixedly mounted on the bearing platform, and a discharge end of the automatic bead separator is located directly above the positioning block.

[0010] Preferably, a reset assembly is provided on the slide, and the reset assembly includes a mounting bracket fixedly connected to the lower side of the slide, an extrusion rod is rotatably connected to the mounting bracket, the extrusion rod has a protrusion at one end close to the positioning block, a through groove is penetrated through the positioning block for the protrusion to pass through, the extrusion rod is fixedly connected to a triangular block at one end away from the positioning block, a spring is provided between the mounting bracket and the extrusion rod, one end of the spring is fixedly connected to the mounting bracket, and the other end of the spring is fixedly connected to the extrusion rod, and a push rod is fixedly connected to the rotating shaft away from the servo motor.

[0011] Preferably, a buffer pad is fixedly connected to the inner side of the positioning block, and the buffer pad is made of rubber material.

[0012] Preferably, two extraction grooves are formed through the positioning block, and the two extraction grooves are symmetrically arranged.

[0013] Preferably, an infrared scanner is installed on the lower side of the automatic bead separator.

[0014] Preferably, a plurality of supporting legs are fixedly connected to the lower side of the supporting platform, and the plurality of supporting legs are symmetrically arranged.

[0015] The beneficial effects of the present invention are: 1. The present invention adopts the technical means of cooperating the feeding unit and the sleeve mechanism, and utilizes the same-direction rotation of the large disc and the small disc to push the outer ring of the bearing and the inner ring of the bearing into the discharge hole in turn, thereby completing the assembly process of the outer ring of the bearing and the inner ring of the bearing, overcoming the shortcomings of the prior art and improving the practicability of the device.

[0016] 2. The present invention adopts the technical means of the push rod and the triangular block cooperating with each other, and the bearing ball and the inner ring of the bearing are automatically engaged by rotating the push rod to intermittently squeeze the triangular block, thereby further improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention for showing the feeding unit and the sleeve closing mechanism; Figure 3 It is a schematic diagram of the overall structure of the present invention for displaying the mobile assembly; Figure 4 It is a schematic diagram for showing the overall structure of the positioning unit and the bead supply unit of the present invention; Figure 5 It is a schematic diagram of the overall structure of the reset component used to display the present invention.

[0018] In the figure: 100, bearing platform; 101, supporting foot; 200, feeding unit; 300, fitting mechanism; 400, moving assembly; 500, positioning unit; 600, bead supply unit; 601, automatic bead separator; 602, infrared scanner; 700, reset assembly; 201, outer ring feed pipe; 202, inner ring feed pipe; 301, large disc; 302, small disc; 303, first feed hole; 304, second feed hole; 305, discharge hole; 401, rotating shaft; 402, synchronous wheel; 403, synchronous belt; 404, servo motor; 501, slideway; 502, positioning block; 503, buffer pad; 504, removal slot; 701, mounting frame; 702, extrusion rod; 703, triangular block; 704, spring; 705, push rod. DETAILED DESCRIPTION

[0019] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0020] like Figure 1 , Figure 2 , Figure 4 As shown, this embodiment discloses a fully automatic deep groove ball bearing assembly machine, including: a bearing platform 100, a feeding unit 200, which is arranged on the bearing platform 100, and the feeding unit 200 includes an outer ring feeding pipe 201 and an inner ring feeding pipe 202 fixedly installed on the bearing platform 100, the inner diameter of the outer ring feeding pipe 201 is equal to the outer diameter of the outer ring of the bearing, and the inner diameter of the inner ring feeding pipe 202 is equal to the outer diameter of the inner ring of the bearing, and an assembly mechanism 300 is arranged on the bearing platform 100, and the assembly mechanism 300 includes a large disc 301 which is rotatably arranged on the bearing platform 100 to and a small disc 302, and the small disc 302 is located on the upper side of the large disc 301, the discharge end of the outer ring feed pipe 201 is arranged on the upper side of the large disc 301, and the discharge end of the inner ring feed pipe 202 is arranged on the upper side of the small disc 302, a first feed hole 303 is penetrated on the large disc 301, and a second feed hole 304 is penetrated on both the large disc 301 and the small disc 302, and a discharge hole 305 is penetrated on the supporting platform 100, and a moving component 400 is arranged on the supporting platform 100, and is used to drive the large disc 301 and the small disc 302 to rotate in the same direction.

[0021] The working principle and beneficial effects of the above technical solution are as follows: first, the outer ring of the bearing and the inner ring of the bearing are stacked and placed in the outer ring feed tube 201 and the inner ring feed tube 202 respectively, the outer ring of the bearing located at the bottom and the upper surface of the large disc 301 are abutted against each other, and the inner ring of the bearing located at the bottom and the upper surface of the small disc 302 are abutted against each other.

[0022] Next, the large disc 301 and the small disc 302 are driven to rotate in the same direction by the moving device. The first feed hole 303 on the large disc 301 first rotates to a position directly opposite to the outer ring feed pipe 201, and the outer ring of the bearing located at the bottom falls into the feed hole. Finally, the second feed hole 304 on the small disc 302 rotates to a position directly opposite to the inner ring feed pipe 202, and the inner ring of the bearing located at the bottom falls into the feed hole. At this time, the second feed hole 304 on the large disc 301 also rotates to a position directly opposite to the outer ring feed pipe 201. However, since the diameter of the second feed hole 304 is smaller than the outer diameter of the bearing outer ring, the bearing outer ring does not fall into the feed hole, and the large disc 301 continues to rotate, driving the bearing outer ring in the first feed hole 303 to move to a position directly opposite to the discharge hole 305, and the bearing outer ring first falls into the discharge hole 305, and then the two second feed holes 304 rotate synchronously to a position directly opposite to the discharge hole 305, and the bearing inner ring also falls into the discharge hole 305 under the action of gravity, thereby successfully completing the fitting process of the bearing inner ring and the bearing outer ring.

[0023] The present invention adopts the technical means of cooperating the feeding unit 200 and the sleeve mechanism 300, and utilizes the same-direction rotation of the large disc 301 and the small disc 302 to push the outer ring of the bearing and the inner ring of the bearing into the discharge hole 305 in turn, thereby completing the bearing outer ring and the bearing inner ring assembly process, overcoming the shortcomings of the prior art and improving the practicality of the device.

[0024] like Figure 3 As shown, in a specific embodiment: the moving component 400 includes two rotating shafts 401 rotatably connected to the supporting platform 100, the two rotating shafts 401 are respectively fixedly connected to the large disk 301 or the small disk 302, and the upper ends of the two rotating shafts 401 are fixedly connected with synchronous wheels 402, and the two synchronous wheels 402 are driven by a synchronous belt 403, and the lower surface of the supporting platform 100 is fixedly installed with a driving device for driving one of the rotating shafts 401 to rotate.

[0025] The working principle and beneficial effects of the above technical solution are as follows: the driving device is started, and the driving device drives one of the rotating shafts 401 to rotate, and then the synchronous wheel 402 thereon rotates. Under the transmission action of the synchronous belt 403, the two synchronous wheels 402 rotate synchronously, and then drive the large disc 301 and the small disc 302 to rotate synchronously, completing the feeding work of the outer ring and the inner ring of the bearing.

[0026] like Figure 3 As shown, in a specific embodiment: the driving device is configured as a servo motor 404 , and the output shaft of the servo motor 404 is fixedly connected to one of the rotating shafts 401 .

[0027] The working principle and beneficial effects of the above technical solution are as follows: the servo motor 404 is started, and the output shaft of the servo motor 404 rotates, driving the rotating shaft 401 to rotate synchronously.

[0028] like Figure 4 As shown, in a specific embodiment: a positioning unit 500 is arranged on the supporting platform 100, and the positioning unit 500 includes a slide 501 fixedly installed on the supporting platform 100, and the slide 501 is arranged directly below the discharge hole 305, and a positioning block 502 is fixedly connected to the side of the slide 501 away from the supporting platform 100, and a positioning groove is opened on the positioning block 502, the slide 501 is inclined at a first set angle, and the positioning block 502 is inclined at a second set angle, and the first set angle is greater than the second set angle.

[0029] The working principle and beneficial effects of the above technical solution are as follows: the outer ring of the bearing and the inner ring of the bearing successively enter the slideway 501 through the discharge hole 305. Since the slideway 501 is inclined, the outer ring of the bearing and the inner ring of the bearing successively slide along the slideway 501 into the positioning groove in the positioning block 502. Since the positioning block 502 is also inclined, the inner ring of the bearing, under the action of gravity, is offset against the inner ring part on the lower side of the outer ring of the bearing, so that a gap is formed between the outer side of the inner ring of the bearing and the inner side of the outer ring of the bearing, which is convenient for the bearing balls to be filled in.

[0030] like Figure 4 As shown, in a specific embodiment: a bead supply unit 600 is provided on the carrier platform 100 , and the bead supply unit 600 includes an automatic bead separator 601 fixedly mounted on the carrier platform 100 , and the discharge end of the automatic bead separator 601 is located directly above the positioning block 502 .

[0031] The working principle and beneficial effects of the above technical solution are as follows: whenever the inner ring and the outer ring of the bearing fall into the positioning groove on the positioning block 502, the automatic bead separator 601 spits out a set number of bearing beads, and the bearing beads just fall into the gap formed between the inner ring and the outer ring of the bearing.

[0032] like Figure 5 As shown, in a specific embodiment: a reset component 700 is arranged on the slide 501, and the reset component 700 includes a mounting frame 701 fixedly connected to the lower side of the slide 501, and an extrusion rod 702 is rotatably connected to the mounting frame 701, and the extrusion rod 702 has a protrusion at one end close to the positioning block 502, and a through groove for the protrusion to pass through is opened on the positioning block 502, and the extrusion rod 702 is fixedly connected to the end away from the positioning block 502 with a triangular block 703, and a spring 704 is arranged between the mounting frame 701 and the extrusion rod 702, one end of the spring 704 is fixedly connected to the mounting frame 701, and the other end of the spring 704 is fixedly connected to the extrusion rod 702, and a push rod 705 is fixedly connected to the rotating shaft 401 away from the servo motor 404.

[0033] The working principle and beneficial effects of the above technical solution are as follows: after the inner ring and the outer ring of the bearing both slide down into the positioning groove on the positioning block 502 and the bearing beads are filled, the rotating shaft 401 continues to rotate, driving the extrusion rod 702 at its lower end to contact and squeeze the inclined portion of the triangular block 703, thereby driving the extrusion rod 702 to rotate, the spring 704 is compressed, and the raised portion on the extrusion rod 702 passes through the contact and pushes the inner ring of the bearing to the center position of the inner ring of the bearing, and multiple bearing beads are distributed in a ring shape between the outer ring of the bearing and the inner ring of the bearing. At this time, the extrusion rod 702 just disengages from the triangular block 703, and the extrusion rod 702 is reset under the elastic force of the spring 704. This cycle is repeated, and the positioning work of the inner ring of the bearing can be intermittently completed by the rotation of the rotating shaft 401.

[0034] like Figure 2 As shown, in a specific embodiment: a buffer pad 503 is fixedly connected to the inner side of the positioning block 502, and the buffer pad 503 is set to be made of rubber material.

[0035] The working principle and beneficial effects of the above technical solution are as follows: the provision of the buffer pad 503 can prevent the outer ring of the bearing and the positioning block 502 from directly colliding.

[0036] like Figure 2 As shown, in a specific embodiment: two extraction grooves 504 are formed through the positioning block 502, and the two extraction grooves 504 are symmetrically arranged.

[0037] The working principle and beneficial effects of the above technical solution are as follows: the provision of the removal groove 504 facilitates the staff to remove the assembled bearings by hand or with a clamp, further improving the practicability of the device.

[0038] like Figure 4 As shown, in a specific embodiment: an infrared scanner 602 is installed on the lower side of the automatic bead separator 601.

[0039] The working principle and beneficial effects of the above technical solution are as follows: when the infrared scanner 602 scans that the inner ring of the bearing stays within its scanning range, the automatic bead separator 601 will be controlled by a pre-set control program to spit out a set number of bearing beads, and the bearing beads will just fall into the gap formed between the inner ring of the bearing and the outer ring of the bearing.

[0040] like Figure 2 As shown, in a specific embodiment: a plurality of supporting legs 101 are fixedly connected to the lower side of the supporting platform 100, and the plurality of supporting legs 101 are symmetrically arranged.

[0041] The working principle and beneficial effects of the above technical solution are as follows: the provision of the supporting legs 101 can improve the stability of the device.

[0042] Working principle: First, the outer ring and the inner ring of the bearing are stacked and placed in the outer ring feed tube 201 and the inner ring feed tube 202 respectively, the outer ring of the bearing at the bottom and the upper surface of the large disc 301 are against each other, and the inner ring of the bearing at the bottom and the upper surface of the small disc 302 are against each other.

[0043] Next, the driving device is started, which drives one of the rotating shafts 401 to rotate, and then the synchronous wheel 402 thereon rotates. Under the transmission action of the synchronous belt 403, the two synchronous wheels 402 rotate synchronously, and then drive the large disc 301 and the small disc 302 to rotate synchronously.

[0044] The first feed hole 303 on the large disc 301 first rotates to a position directly opposite to the outer ring feed pipe 201, and the outer ring of the bearing located at the bottom falls into the feed hole. Finally, the second feed hole 304 on the small disc 302 rotates to a position directly opposite to the inner ring feed pipe 202, and the inner ring of the bearing located at the bottom falls into the feed hole. At this time, the second feed hole 304 on the large disc 301 also rotates to a position directly opposite to the outer ring feed pipe 201, but Since the diameter of the second feed hole 304 is smaller than the outer diameter of the bearing outer ring, the bearing outer ring does not fall into the feed hole. The large disc 301 continues to rotate, driving the bearing outer ring in the first feed hole 303 to move to a position opposite to the discharge hole 305. The bearing outer ring first falls into the discharge hole 305, and then the two second feed holes 304 rotate synchronously to a position opposite to the discharge hole 305. The bearing inner ring also falls into the discharge hole 305 under the action of gravity.

[0045] The outer ring of the bearing and the inner ring of the bearing successively enter the slideway 501 through the discharge hole 305. Since the slideway 501 is tilted, the outer ring of the bearing and the inner ring of the bearing successively slide along the slideway 501 into the positioning groove in the positioning block 502. Since the positioning block 502 is also tilted, the inner ring of the bearing is offset against the inner ring part on the lower side of the outer ring of the bearing under the action of gravity, so that a gap is formed between the outer side of the inner ring of the bearing and the inner side of the outer ring of the bearing, which is convenient for the bearing ball to be filled in.

[0046] Whenever the inner ring and the outer ring of the bearing fall into the positioning groove on the positioning block 502, the automatic bead separator 601 spits out a set number of bearing beads, and the bearing beads just fall into the gap formed between the inner ring and the outer ring of the bearing.

[0047] After the inner ring and the outer ring of the bearing have both slid down into the positioning groove on the positioning block 502 and the bearing beads are filled, the rotating shaft 401 continues to rotate, driving the extrusion rod 702 at its lower end to contact and squeeze the inclined portion of the triangular block 703, thereby driving the extrusion rod 702 to rotate, the spring 704 is compressed, and the raised portion on the extrusion rod 702 passes through the contact and pushes the inner ring of the bearing to the center position of the inner ring of the bearing. Multiple bearing beads are distributed in a ring shape between the outer ring of the bearing and the inner ring of the bearing. At this time, the extrusion rod 702 just disengages from the triangular block 703, and the extrusion rod 702 is reset under the elastic force of the spring 704. This cycle is repeated, and the positioning work of the inner ring of the bearing can be intermittently completed by rotating the rotating shaft 401.

[0048] The above describes an embodiment of the present invention, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms, all of which are protected by this embodiment.

Claims

1. A fully automatic deep groove ball bearing assembly machine, characterized in that: include: Carrying platform (100); A feeding unit (200) is arranged on the bearing platform (100); the feeding unit (200) comprises an outer ring feeding pipe (201) and an inner ring feeding pipe (202) fixedly mounted on the bearing platform (100); the inner diameter of the outer ring feeding pipe (201) is equal to the outer diameter of the bearing outer ring, and the inner diameter of the inner ring feeding pipe (202) is equal to the outer diameter of the bearing inner ring; A sleeve-fitting mechanism (300) is arranged on the bearing platform (100); the sleeve-fitting mechanism (300) comprises a large disc (301) and a small disc (302) rotatably arranged on the bearing platform (100), wherein the small disc (302) is located on the upper side of the large disc (301), the discharge end of the outer ring feeding pipe (201) is arranged on the upper side of the large disc (301), the discharge end of the inner ring feeding pipe (202) is arranged on the upper side of the small disc (302), a first feed hole (303) is penetrated through the large disc (301), a second feed hole (304) is penetrated through the large disc (301) and the small disc (302), and a discharge hole (305) is penetrated through the bearing platform (100); The moving assembly (400) is arranged on the supporting platform (100) and is used to drive the large disc (301) and the small disc (302) to rotate in the same direction.

2. The fully automatic deep groove ball bearing assembly machine according to claim 1, characterized in that: The moving assembly (400) comprises two rotating shafts (401) rotatably connected to the supporting platform (100), the two rotating shafts (401) being fixedly connected to the large disc (301) or the small disc (302) respectively, and the upper ends of the two rotating shafts (401) are fixedly connected to synchronous wheels (402), the two synchronous wheels (402) are driven by a synchronous belt (403), and a driving device for driving one of the rotating shafts (401) to rotate is fixedly installed on the lower surface of the supporting platform (100).

3. The fully automatic deep groove ball bearing assembly machine according to claim 2, characterized in that: The driving device is configured as a servo motor (404), and an output shaft of the servo motor (404) is fixedly connected to one of the rotating shafts (401).

4. The fully automatic deep groove ball bearing assembly machine according to claim 3, characterized in that: A positioning unit (500) is provided on the supporting platform (100), and the positioning unit (500) comprises a slideway (501) fixedly mounted on the supporting platform (100), the slideway (501) being arranged directly below the discharge hole (305), a positioning block (502) being fixedly connected to a side of the slideway (501) away from the supporting platform (100), a positioning groove being provided on the positioning block (502), the slideway (501) being inclined at a first set angle, the positioning block (502) being inclined at a second set angle, and the first set angle being greater than the second set angle.

5. The fully automatic deep groove ball bearing assembly machine according to claim 4, characterized in that: A bead supply unit (600) is provided on the support platform (100), and the bead supply unit (600) comprises an automatic bead separator (601) fixedly mounted on the support platform (100), and a discharge end of the automatic bead separator (601) is located directly above the positioning block (502).

6. The fully automatic deep groove ball bearing assembly machine according to claim 5, characterized in that: A reset assembly (700) is arranged on the slideway (501), and the reset assembly (700) comprises a mounting frame (701) fixedly connected to the lower side of the slideway (501); an extrusion rod (702) is rotatably connected to the mounting frame (701); an end of the extrusion rod (702) close to the positioning block (502) has a protrusion, and a through slot is provided on the positioning block (502) for the protrusion to pass through; an end of the extrusion rod (702) away from the positioning block (502) is fixedly connected to a triangular block (703); a spring (704) is arranged between the mounting frame (701) and the extrusion rod (702), one end of the spring (704) is fixedly connected to the mounting frame (701), and the other end of the spring (704) is fixedly connected to the extrusion rod (702); a push rod (705) is fixedly connected to the rotating shaft (401) away from the servo motor (404).

7. The fully automatic deep groove ball bearing assembly machine according to claim 6, characterized in that: A buffer pad (503) is fixedly connected to the inner side of the positioning block (502), and the buffer pad (503) is made of rubber material.

8. The fully automatic deep groove ball bearing assembly machine according to claim 7, characterized in that: Two extraction grooves (504) are formed through the positioning block (502), and the two extraction grooves (504) are symmetrically arranged.

9. The fully automatic deep groove ball bearing assembly machine according to claim 8, characterized in that: An infrared scanner (602) is installed on the lower side of the automatic bead separator (601).

10. The fully automatic deep groove ball bearing assembly machine according to claim 9, characterized in that: A plurality of supporting legs (101) are fixedly connected to the lower side of the bearing platform (100), and the plurality of supporting legs (101) are symmetrically arranged.

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