CN115992835B - Noise-reduction bass generator adopting hydrogen energy to generate power - Google Patents

Abstract

The invention relates to the technical field of hydrogen energy generators, in particular to a noise reduction bass generator for generating electricity by adopting hydrogen energy, which comprises an outer box body, wherein a power generation pile main body is fixed in the outer box body, a fan piece is arranged on the power generation pile main body, the fan piece comprises a protection cylinder, a fan and an interception cover, the fan is arranged in the protection cylinder, the interception covers are arranged on two sides of the fan, the interception cover is fixed on the protection cylinder, the fan comprises a fan barrel, fan blades, an inner frame, a motor and a control piece, and the fan continuously rotates in the working process.

Description

Noise-reduction bass generator adopting hydrogen energy to generate power

Technical Field

The invention relates to the technical field of hydrogen energy generators, in particular to a noise-reduction bass generator for generating electricity by using hydrogen energy.

Background

The hydrogen generator is a single generator taking hydrogen as a raw material, the internal combustion engine principle is utilized, the motor is driven to generate current output through the processes of air suction, compression, explosion and exhaust, vibration noise can be generated in the working process of the hydrogen generator, the surrounding environment is influenced, the long-time vibration can also cause loosening of parts, the service life of the hydrogen generator is further reduced, so that the noise reduction bass technology of the hydrogen generator is particularly important, the problem of a plurality of noise sources needs to be solved, the bass noise reduction performance of the hydrogen generator can be effectively improved, the fan is required to continuously rotate to work in the working process of the hydrogen generator, vibration noise is more easily generated by the fan, the shaft and the shaft sleeve are loosened, the fan shakes to sound, if the shaft sleeve and the shaft are precisely matched, the fan is prevented from shaking, the shaft is required to continuously lubricate, the shaft with insufficient lubrication and the shaft sleeve rubs, noise can be generated, and the noise is generated based on the concept of automatic lubrication of the rotating shaft of the fan.

Disclosure of Invention

The invention aims to provide a noise-reducing bass generator adopting hydrogen energy to generate electricity so as to solve the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an adopt low formula generator of making an uproar falls of hydrogen energy electricity generation, includes the outer box, be fixed with the electricity generation in the outer box and pile the main part, be provided with the fan spare in the electricity generation pile the main part, the fan spare includes guard drum, fan and interception cover, be provided with the fan in the guard drum, the both sides of fan all are provided with the interception cover, and the interception cover is fixed on the guard drum, the fan includes fan bucket, flabellum, inner frame, motor and control, be provided with inner frame, motor and control in the fan bucket, be fixed with the motor in the inner frame, inner frame one side and an interception cover fixed connection, the inner frame opposite side is provided with the control, and control one end and motor are connected, the control other end and fan bucket are connected, the inner frame includes a plurality of L templates that ring plate, ring plate are gone up to encircle and are established and the semi-column piece, fix two rings on the inside wall of fan bucket, and semi-column piece setting of inner frame is between two rings on the bucket.

Preferably, the control piece comprises a fan shaft, a reinforcing arc plate, a power piece and an oil piece, wherein two reinforcing arc plates are uniformly arranged on the side face of the fan shaft in a ring mode, one end of each reinforcing arc plate is connected with the power piece, the power piece is sleeved on the fan shaft, the oil piece is arranged below the fan shaft and is in transmission connection with the power piece, one end of the fan shaft is in butt joint with the motor, the other end of the fan shaft is fixedly connected with the bottom plate on the fan barrel, and the power piece is arranged on the inner frame.

Preferably, the power piece includes the control body, first shell fragment, control arc board, accuse position arc board, bevel gear and locating shaft, the outside cover of fan axle has the control body, the control body includes a ring section of thick bamboo, the long board of ring section of thick bamboo one side body coupling and a row of tooth that ring section of thick bamboo opposite side arc distributes, the long board one end of control body is provided with the control arc board, control arc board and fan axle contact, be fixed with two symmetrical distribution's first shell fragment between control arc board and the control body, bevel gear and control body meshing are connected, the one end of bevel gear is fixed with the locating shaft, the locating shaft activity cup joints in the through-hole of seting up on the ring board of inner frame, the arc plate hole of seting up on the ring section of thick bamboo activity of control body passes accuse position arc board, accuse position arc board one end and consolidates arc board fixed connection, the other end of accuse position arc board is fixed on the ring board of inner frame, two accuse position arc boards symmetrical distribution are outside the fan axle, bevel gear transmission control oil piece.

Preferably, the oil piece includes L type lift post, J-shaped template, top controlling part, first position piece, oil tank, oil cloth frame and first shell fragment that resets, the one end of L type lift post sets up a row of tooth's socket, and L type lift post and bevel gear meshing are connected, one side of L type lift post is fixed with the oil tank, the square hole of seting up on the first position piece is passed in the activity of L type lift post, first position piece is fixed on the inner frame, L type lift post bottom is fixed with first shell fragment that resets, the one end of first shell fragment that resets is fixed on the inner frame, be provided with the oil cloth frame in the oil tank, and the lubricating oil of storage soaking oil cloth frame in the oil tank, the top protrusion of oil cloth frame is outside the oil tank, and oil cloth frame both ends are provided with two symmetrically distributed's J-shaped templates, two J-shaped templates cooperation cover oil cloth frame tops, and top controlling part transmission control two J-shaped templates open and shut.

Preferably, the oilcloth frame includes deflector, quarter butt, control frame, oilcloth, rotary drum, bottom accuse board, guide block and second shell fragment that resets, the both sides of control frame all movable sleeve has the rotary drum, and adjacent both sides all are provided with a plurality of deflector, two rotary drum cooperation support oilcloth, two strip holes of seting up on the top casing of oilcloth activity through the oil tank are fixed with the quarter butt on the deflector, quarter butt one end is fixed on the control frame, the control frame bottom is fixed with two symmetric distribution's bottom accuse boards, the bottom of bottom accuse board is fixed with the second shell fragment that resets, the second shell fragment that resets is fixed on the inner wall of oil tank, the bottom accuse board activity is passed the diaphragm orifice of seting up on the guide block, guide block one end is fixed on the inner wall of oil tank.

Preferably, the control frame is a square frame formed by splicing four round bars, the tarpaulin is closed loop cloth in end-to-end butt joint, the guide plate is in a concave folded plate shape, the edge of the tarpaulin protrudes into a sliding groove formed in the edge of the guide plate shell, and the top of the control frame penetrates through a through hole formed in the oil tank shell.

Preferably, the top control comprises a second elastic sheet, a concave folding control column and a turning control assembly, wherein the second elastic sheet is fixed at the top of the concave folding control column, the bottom of the concave folding control column is connected with two turning control assemblies which are symmetrically distributed in a transmission manner, and the turning control assembly is connected with the J-shaped plate.

Preferably, the turnover control assembly comprises a concave folding side column, a third reset spring plate, a gear, a long shaft and a shaft seat, wherein the long shaft is fixed on one side of the J-shaped plate, the gear is fixed at one end of the long shaft, the shaft seat is fixed at the top of the oil tank, the long shaft is movably sleeved in a through hole formed in the shaft seat, two ends of the concave folding control column are respectively provided with a row of teeth, the concave folding control column is in meshed transmission connection with the gear, the concave folding side column is fixed on the oil tank, the concave folding control column movably penetrates through a square hole formed in one end of the concave folding side column, one end of the third reset spring plate is fixed on the concave folding control column, and the other end of the third reset spring plate is fixed on the concave folding side column.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention reduces the noise problem caused by shaft friction by continuously and autonomously lubricating the fan, ensures the shaft to be fully lubricated, can be in close contact with the reinforcing arc plate, can avoid the problem of shaking in the rotation of the fan shaft, further avoids the occurrence of vibration noise, and improves the bass performance of the whole hydrogen energy generator.

2. Once the surface of the fan shaft is dry, an oil supply mechanism of the oil part is automatically triggered, the oil tank drives the oil cloth rack to ascend, the oil cloth rack is contacted with the fan shaft, lubricating oil is smeared on the side wall of the fan shaft which continuously rotates, and the function of autonomous oil supply control is realized.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention.

FIG. 2 is a schematic view of a fan assembly position.

Fig. 3 is a schematic view of a fan structure.

Fig. 4 is a schematic diagram of a fan structure.

Fig. 5 is a schematic structural view of the control member.

Fig. 6 is a schematic view of a fan shaft.

Fig. 7 is a schematic diagram of the power member structure.

Fig. 8 is a schematic diagram of the oil structure.

Fig. 9 is a schematic diagram of the structure of the fuel tank.

Fig. 10 is a schematic diagram of a tarpaulin frame structure.

Fig. 11 is a schematic diagram of the structure at a in fig. 10.

Fig. 12 is a schematic view of a J-shaped plate structure.

In the figure: the electric power generation pile comprises an outer box body 1, a power generation pile main body 2, a fan piece 3, a protection cylinder 4, a fan 5, an interception cover 6, a fan barrel 10, fan blades 11, an inner frame 12, a motor 13, a control piece 14, a fan shaft 15, a reinforcing arc plate 16, a power piece 17, an oil piece 18, a control body 19, a first elastic piece 20, a control arc plate 21, a control arc plate 22, a bevel gear 23, a positioning shaft 24, an L-shaped lifting column 25, a J-shaped plate 26, a top control 27, a first position block 28, an oil tank 29, an oil cloth frame 30, a first reset elastic piece 31, a guide plate 32, a short rod 33, a control frame 34, an oil cloth 35, a rotary drum 36, a bottom control plate 37, a guide block 38, a second reset elastic piece 39, a second elastic piece 40, a concave folding control column 41, a turnover control assembly 42, a concave folding side column 43, a third reset elastic piece 44, a gear 45, a long shaft 46 and an axle seat 47.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by a person skilled in the art without making any creative effort fall within the protection scope of the present invention.

Referring to fig. 1 to 12, the present invention provides a technical solution: the utility model provides an adopt low formula generator of making an uproar falls of hydrogen energy electricity generation, including outer box 1, be fixed with in the outer box 1 and pile main part 2, be provided with fan spare 3 on the pile main part 2, fan spare 3 includes guard drum 4, fan 5 and interception cover 6, be provided with fan 5 in the guard drum 4, the both sides of fan 5 all are provided with interception cover 6, interception cover 6 is fixed on guard drum 4, fan 5 includes fan bucket 10, flabellum 11, inner frame 12, motor 13 and control 14, fan bucket 10 outside solid fixed ring is equipped with a plurality of evenly distributed flabellum 11, be provided with inner frame 12 in the fan bucket 10, motor 13 and control 14, be fixed with motor 13 in the inner frame 12, inner frame 12 one side and one interception cover 6 fixed connection, the inner frame 12 opposite side is provided with control 14, control 14 one end and motor 13 are connected, the control 14 other end and fan bucket 10 are connected, inner frame 12 includes the ring plate, a plurality of L ring body and L ring body on the ring plate are established, fix two on the inside wall of fan bucket 10, be provided with two fan 12 on the half-piece on the ring plate 10.

The control piece 14 comprises a fan shaft 15, a reinforcing arc plate 16, a power piece 17 and an oil piece 18, wherein two reinforcing arc plates 16 are uniformly arranged on the side face of the fan shaft 15 in a ring mode, one end of each reinforcing arc plate 16 is connected with the power piece 17, the power piece 17 is sleeved on the fan shaft 15, the oil piece 18 is arranged below the fan shaft 15, the oil piece 18 is in transmission connection with the power piece 17, one end of the fan shaft 15 is in butt joint with the motor 13, the other end of the fan shaft 15 is fixedly connected with a bottom plate on the fan barrel 10, and the power piece 17 is arranged on the inner frame 12.

The power piece 17 comprises a control body 19, a first elastic sheet 20, a control arc plate 21, a position control arc plate 22, a bevel gear 23 and a positioning shaft 24, wherein the control body 19 is sleeved outside the fan shaft 15, the control body 19 comprises a ring cylinder, a long plate integrally connected with one side of the ring cylinder and a row of teeth distributed in an arc shape on the other side of the ring cylinder, one end of the long plate of the control body 19 is provided with the control arc plate 21, the control arc plate 21 is contacted with the fan shaft 15, two symmetrically distributed first elastic sheets 20 are fixed between the control arc plate 21 and the control body 19, the bevel gear 23 is meshed with the control body 19, one end of the bevel gear 23 is fixed with the positioning shaft 24, the positioning shaft 24 is movably sleeved in a through hole formed in the ring plate of the inner frame 12, the ring cylinder of the control body 19 movably penetrates through an arc plate hole formed in the position control arc plate 22, one end of the position control arc plate 22 is fixedly connected with the reinforcing arc plate 16, the other end of the position control arc plate 22 is fixed on the ring plate of the inner frame 12, the two position control arc plates 22 are symmetrically distributed outside the fan shaft 15, and the bevel gear 23 drives the control oil piece 18.

The oil piece 18 comprises an L-shaped lifting column 25, a J-shaped plate 26, a top control 27, a first position block 28, an oil tank 29, an oil cloth rack 30 and a first reset spring 31, wherein one end of the L-shaped lifting column 25 is provided with a row of tooth grooves, the L-shaped lifting column 25 is connected with the bevel gear 23 in a meshed mode, one side of the L-shaped lifting column 25 is fixedly provided with the oil tank 29, the L-shaped lifting column 25 movably penetrates through a square hole formed in the first position block 28, the first position block 28 is fixedly arranged on the inner rack 12, the bottom of the L-shaped lifting column 25 is fixedly provided with the first reset spring 31, one end of the first reset spring 31 is fixedly arranged on the inner rack 12, the oil tank 29 is internally provided with the oil cloth rack 30, lubricating oil for soaking the oil cloth rack 30 is stored in the oil tank 29, the top of the oil cloth rack 30 protrudes out of the oil tank 29, two symmetrically distributed J-shaped plates 26 are arranged at two ends of the oil cloth rack 30, the two J-shaped plates 26 are matched with and cover the top of the oil cloth rack 30, and the top of the top control 27 is in a transmission mode to control the opening and closing of the two J-shaped plates 26.

The oilcloth rack 30 comprises a guide plate 32, a short rod 33, a control frame 34, oilcloth 35, a rotary drum 36, a bottom control plate 37, a guide block 38 and a second reset spring piece 39, wherein the rotary drum 36 is movably sleeved on two sides of the control frame 34, a plurality of guide plates 32 are arranged on two adjacent sides, the two rotary drums 36 are matched to support the oilcloth 35, the oilcloth 35 movably passes through two strip holes formed in the top shell of the oil tank 29, the short rod 33 is fixed on the guide plate 32, one end of the short rod 33 is fixed on the control frame 34, two symmetrically distributed bottom control plates 37 are fixed at the bottom of the control frame 34, the second reset spring piece 39 is fixed on the inner wall of the oil tank 29, the bottom control plate 37 movably passes through a plate hole formed in the guide block 38, and one end of the guide block 38 is fixed on the inner wall of the oil tank 29.

The control frame 34 is a square frame formed by splicing four round bars, the tarpaulin 35 is a closed loop piece of cloth which is butted end to end, the guide plate 32 is in a concave folded plate shape, the edge of the tarpaulin 35 protrudes into a chute formed in the edge of the shell of the guide plate 32, and the top of the control frame 34 penetrates through a through hole formed in the shell of the oil tank 29.

The top control 27 comprises a second elastic sheet 40, a concave folding control column 41 and a turning control assembly 42, the second elastic sheet 40 is fixed at the top of the concave folding control column 41, two symmetrically distributed turning control assemblies 42 are connected with the bottom of the concave folding control column 41 in a transmission manner, and the turning control assemblies 42 are connected with the J-shaped plate 26.

The turning control assembly 42 comprises a concave folding side column 43, a third reset elastic piece 44, a gear 45, a long shaft 46 and a shaft seat 47, wherein the long shaft 46 is fixed on one side of the J-shaped plate 26, one end of the long shaft 46 is fixed with the gear 45, the shaft seat 47 is fixed on the top of the oil tank 29, the long shaft 46 is movably sleeved in a through hole formed in the shaft seat 47, two ends of the concave folding control column 41 are respectively provided with a row of teeth, the concave folding control column 41 is in meshed transmission connection with the gear 45, the concave folding side column 43 is fixed on the oil tank 29, the concave folding control column 41 movably penetrates through a square hole formed in one end of the concave folding side column 43, one end of the third reset elastic piece 44 is fixed on the concave folding control column 41, and the other end of the third reset elastic piece is fixed on the concave folding side column 43.

Under the normal lubrication condition, the control arc plate 21 is not driven in the rotation process of the fan shaft 15, the control arc plate 21 and the fan shaft 15 slide in a staggered manner, the surface lubrication of the fan shaft 15 is insufficient, the fan shaft 15 with dry side walls rotates to drive the control arc plate 21, the control body 19 is driven to rotate through the first elastic sheet 20, the control body 19 drives the bevel gear 23, the bevel gear 23 rotates to control the L-shaped lifting column 25 to lift the oil tank 29, the oil cloth frame 30 is further controlled to lift, the oil cloth 35 contacts with the side walls of the fan shaft 15, the oil cloth 35 is attached with lubricating oil, the lubricating oil is smeared on the surface of the fan shaft 15, the surface lubrication of the fan shaft 15 is realized, in the process, the fan shaft 15 rotates to cause the oil cloth 35 to move, so that lubricating oil in the oil tank 29 is attached to the fan shaft 15 through the oil cloth 35, the J-shaped plates 26 on two sides can be automatically opened in the ascending process of the oil tank 29, after the oil tank 29 falls back, the two J-shaped plates 26 are covered on the top of the oil cloth frame 30 in a closing manner, the oil cloth 35 on the top of the oil tank 29 is dried, the two J-shaped plates 26 are separated because the top of the second elastic sheet 40 is contacted with the fan shaft 15 in the ascending process of the oil tank 29, the second elastic sheet 40 is pressed down to form a concave folding control column 41, the concave folding control column 41 conveys a gear 45, the gear 45 rotates to drive a long shaft 46, and the long shaft 46 controls the J-shaped plates 26 to turn.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. The utility model provides an adopt low formula generator of making an uproar falls in hydrogen energy electricity generation, includes outer box (1), be fixed with in outer box (1) and pile main part (2), be provided with fan (3), its characterized in that on pile main part (2): the fan piece (3) comprises a protection cylinder (4), a fan (5) and an interception cover (6), the fan (5) is arranged in the protection cylinder (4), the interception cover (6) is arranged on two sides of the fan (5), the interception cover (6) is fixed on the protection cylinder (4), the fan (5) comprises a fan barrel (10), fan blades (11), an inner frame (12), a motor (13) and a control piece (14), a plurality of evenly distributed fan blades (11) are arranged on an external fixing ring of the fan barrel (10), an inner frame (12), the motor (13) and the control piece (14) are arranged in the fan barrel (10), the motor (13) is fixed in the inner frame (12), one side of the inner frame (12) is fixedly connected with one interception cover (6), the control piece (14) is arranged on the other side of the inner frame (12), one end of the control piece (14) is connected with the motor (13), the other end of the control piece (14) is connected with the fan barrel (10), the inner frame (12) comprises a ring plate, a plurality of L-shaped and L-shaped upper fixing blocks arranged on the ring body on the ring plate, and the fan barrel (10) is arranged between two inner side walls of the fan barrel (10) and the fan barrel (14) and the fan barrel (15) is arranged between two inner side walls (15) of the fan barrel Reinforcing arc plates (16), power piece (17) and oil piece (18), fan axle (15) side evenly encircles and is equipped with two reinforcing arc plates (16), reinforcing arc plate (16) one end is connected with power piece (17), power piece (17) cover is on fan axle (15), fan axle (15) below is provided with oil piece (18), oil piece (18) and power piece (17) transmission are connected, fan axle (15) one end and motor (13) butt joint, fan axle (15) other end and the bottom plate fixed connection on fan bucket (10), power piece (17) set up on inner frame (12), power piece (17) are including control body (19), first shell fragment (20), control arc plate (21), accuse position arc plate (22), bevel gear (23) and location axle (24), fan axle (15) outside cover has control body (19), control body (19) include a ring section of thick bamboo, a long board and a row of tooth that ring section of thick bamboo opposite side arc distributes, control body (19) one end is provided with control plate (21), control body (21) and fan (19) are connected with arc bevel gear (24) and two arc plates (19) are connected between control body (19) and fan (19) arc plates, control body (19) are connected with arc plate (20) and arc plate (23) are fixed to control arc plate (20), one end of a bevel gear (23) is fixedly provided with a positioning shaft (24), the positioning shaft (24) is movably sleeved in a through hole formed in a ring plate of an inner frame (12), a ring cylinder of a control body (19) movably penetrates through an arc plate hole formed in a position control arc plate (22), one end of the position control arc plate (22) is fixedly connected with a reinforcing arc plate (16), the other end of the position control arc plate (22) is fixedly arranged on the ring plate of the inner frame (12), two position control arc plates (22) are symmetrically distributed outside a fan shaft (15), the bevel gear (23) drives a control oil piece (18), the oil piece (18) comprises an L-shaped lifting column (25), a J-shaped plate (26), a top control piece (27), a first position block (28), an oil tank (29), an oil distribution frame (30) and a first reset spring piece (31), one end of the L-shaped lifting column (25) is provided with a row of tooth grooves, one side of the L-shaped lifting column (25) is meshed with the bevel gear (23), the L-shaped lifting column (25) is fixedly connected with the first reset spring piece (31) penetrating through the first position block (28) at the first position block (31), the first position block (28) is fixedly arranged at the first position block (31), the oil tank (29) is internally provided with an oil cloth rack (30), lubricating oil which soaks the oil cloth rack (30) is stored in the oil tank (29), the top of the oil cloth rack (30) protrudes to the outside of the oil tank (29), two symmetrically distributed J-shaped plates (26) are arranged at two ends of the oil cloth rack (30), the two J-shaped plates (26) are matched to cover the top of the oil cloth rack (30), a top control piece (27) is used for controlling the two J-shaped plates (26) to open and close, the oil cloth rack (30) comprises a guide plate (32), a short rod (33), a control frame (34), an oil cloth (35), a rotary drum (36), a bottom control plate (37), a guide block (38) and a second reset spring piece (39), two sides of the control frame (34) are movably sleeved with the rotary drum (36), a plurality of guide plates (32) are arranged at two adjacent sides, the two rotary drum (36) are matched to support the oil cloth (35), the oil cloth (35) movably penetrates through two holes formed in the top shell of the oil tank (29), the short rod (32) is fixedly provided with the short rod (33), the bottom of the short rod (33) is fixedly provided with the bottom control plate (37), the bottom of the control frame (33) is fixedly provided with the second reset spring piece (39), the second shell fragment that resets (39) is fixed on the inner wall of oil tank (29), and bottom accuse board (37) activity passes the hole of seting up on guide block (38), and guide block (38) one end is fixed on the inner wall of oil tank (29), control frame (34) are square frame that is pieced together by four round bars, oilcloth (35) are the closed loop cloth of head and the tail butt joint, deflector (32) are concave folded plate form, and in the spout of seting up on deflector (32) casing edge is bulged at the edge of oilcloth (35), the through-hole of seting up on oil tank (29) casing is passed at control frame (34) top, top controlling piece (27) are including second shell fragment (40), concave control post (41) and turn over controlling component (42), the top of concave control post (41) is fixed with second shell fragment (40), and the bottom transmission of concave control post (41) is connected with two symmetrical distribution turns over controlling component (42) and J template (26) are connected.

2. A noise-reducing bass generator for generating electricity using hydrogen energy as defined in claim 1, wherein: the turning control assembly (42) comprises a concave folding side column (43), a third reset elastic piece (44), a gear (45), a long shaft (46) and a shaft seat (47), wherein the long shaft (46) is fixed on one side of the J-shaped plate (26), one end of the long shaft (46) is fixed with the gear (45), the shaft seat (47) is fixed on the top of the oil tank (29), the long shaft (46) is movably sleeved in a through hole formed in the shaft seat (47), two ends of the concave folding control column (41) are respectively provided with a row of teeth, the concave folding control column (41) is connected with the gear (45) in a meshed transmission mode, the concave folding side column (43) is fixed on the oil tank (29), one end of the concave folding control column (41) movably penetrates through a square hole formed in one end of the concave folding side column (43), and one end of the third reset elastic piece (44) is fixed on the concave folding control column (41) and the other end of the concave folding control column (43).

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