CN212549694U

CN212549694U - Jaw crusher convenient to move

Info

Publication number: CN212549694U
Application number: CN202021014770.9U
Authority: CN
Inventors: 李飞林
Original assignee: Shenzhen Linfeng Environmental Protection Co ltd
Current assignee: Shenzhen Linfeng Environmental Protection Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-02-19
Anticipated expiration: 2030-06-04

Abstract

The utility model relates to a jaw crusher's technical field especially relates to a jaw crusher convenient to remove, it includes the box, decide the jaw plate, move the jaw plate, eccentric shaft and drive assembly, vertical jaw plate of deciding is fixed in the box inside wall, it sets up in the box and relative with deciding the jaw plate to be moved that the slope set up through the eccentric shaft, a drive assembly for driving the eccentric shaft sets up in the box top and is connected with the eccentric shaft, still include four moving mechanism, the bottom half is equipped with the base, four moving mechanism that have raising and lowering functions set up in the base and be close to four angle departments of base top surface respectively, a vertical base and the ground butt of stretching out of work portion for moving jaw crusher's moving mechanism, moving mechanism's work portion is rotatable wheel form. The utility model discloses the effect of being convenient for remove has.

Description

Jaw crusher convenient to move

Technical Field

The utility model belongs to the technical field of jaw crusher's technique and specifically relates to a jaw crusher convenient to remove is related to.

Background

The jaw crusher mainly comprises a fixed jaw plate for crushing and a movable jaw plate for swinging, extruding and crushing. The movable jaw plate periodically swings to the fixed jaw plate to crush materials, when the movable jaw plate leaves the fixed jaw plate and swings in the opposite direction, a large gap is generated to move downwards by the weight of the materials, each periodic swinging movement of the movable jaw plate enables the materials to be crushed once and to be discharged downwards for a certain distance, and the materials are finally discharged out of the machine from a discharge hole at the lower ends of the two jaw plates. The jaw crusher has the characteristics of simple structure, large crushing ratio, reliable work, simple and convenient maintenance, economic operation cost and the like, and is widely applied to various industries such as mines, smelting, building materials, cement, chemical industry, coal, refractory materials, ceramics and the like.

The utility model discloses a chinese utility model patent that has bulletin No. CN206731192U discloses a hubei province formula breaker, which comprises a case, fix the hubei province board on the box, be used for the crowded building stones move hubei province board, by motor drive's eccentric shaft and with move hubei province board articulated telescopic link, a plurality of bar openings have all been seted up to box both sides wall, it all is fixed with a plurality of nose bars that slide on the bar opening to decide hubei province board both sides, nose bar end threaded connection has the stop nut who is used for the centre gripping tank wall, hubei province formula breaker is when using, can be through adjusting, make the broken not the not demand of the building stones of.

The above prior art solutions have the following drawbacks: the building site often is equipped with a plurality of stations, and the quantity of jaw crusher is less than the quantity of station, and jaw crusher then needs to remove between a plurality of stations on the building site, if want to remove foretell jaw crusher, then needs the workman to carry this jaw crusher to the transport vechicle with the help of other instruments on, and the rethread transport vechicle is accomplished the removal to this jaw crusher, and this jaw crusher is not convenient for remove.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a jaw crusher convenient to remove has the effect of being convenient for remove.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a hubei province formula breaker convenient to remove, includes box, bazoo province board, moves hubei province board, two relative eccentric shafts and two relative drive assembly, and is vertical the bazoo province board is fixed in the box inside wall, is the slope setting move hubei province board and set up in the box and relative with hubei province board through two relative eccentric shafts, be used for driving two drive assembly of eccentric shaft all set up in the box lateral wall and respectively with the eccentric shaft connection that corresponds, still include four moving mechanism, the bottom half is equipped with the base, has four of raising and lowering functions moving mechanism sets up in the base and is close to four angle departments of base top surface respectively for remove hubei province formula breaker the vertical base that stretches out of moving mechanism's work portion and with ground butt, moving mechanism's work portion is rotatable wheel.

Through adopting above-mentioned technical scheme, when needing to remove hubei province formula breaker, through raising and lowering functions, moving mechanism's work portion can stretch out the base bottom and with ground butt to prop up the box, make box bottom surface and ground have the interval, moving mechanism is the work portion of wheel form and can rotate, thereby the workman of being convenient for removes hubei province formula breaker.

The present invention may be further configured in a preferred embodiment as: the utility model discloses a damping device for the automobile, including base, telescopic link, universal wheel, base, top surface, box bottom surface, moving mechanism, cylinder, first damper and universal wheel, the vertical cross-section of base is the font of falling U and there is the interval in its top surface and the box bottom surface, moving mechanism includes cylinder, first damper and universal wheel, the cylinder is fixed in the top surface of base, the telescopic link of cylinder is vertical decurrent wears to establish the base top surface and is connected with first damper, the universal wheel is connected in first damper's bottom, the universal wheel.

Through adopting above-mentioned technical scheme, the base of the font of falling U provides the position of installation for moving mechanism, and the universal wheel can stretch out from the opening part of base under the control of cylinder.

The present invention may be further configured in a preferred embodiment as: the first damping assembly comprises a connecting seat and a first spring, the telescopic rod of the air cylinder penetrates through the top surface of the connecting seat and is in sliding connection with the top surface of the connecting seat, the first spring is fixed between one end, close to the inner bottom surface of the connecting seat, of the telescopic rod of the air cylinder and the inner bottom surface of the connecting seat, and the universal wheel is connected to the outer bottom surface of the connecting seat.

Through adopting above-mentioned technical scheme, when the building site removed jaw crusher, first spring can play absorbing effect through compressing and reseing.

The present invention may be further configured in a preferred embodiment as: the telescopic link of cylinder is equipped with and is used for absorbing second damper assembly, second damper assembly's bottom is connected with the top of connecting seat.

Through adopting above-mentioned technical scheme, the second damper assembly can further the shock attenuation to alleviate the burden of first spring, also enable jaw crusher's removal process more smoothly.

The present invention may be further configured in a preferred embodiment as: second damper includes mounting panel, two relative connecting rods, double-phase relative slider and two relative second springs, the horizontally mounting panel fixed connection just is close to in the connecting seat in the telescopic link of cylinder, two the connecting rod rotates respectively to be connected in two relative sides of mounting panel, the top surface of connecting seat is equipped with two relative spouts, corresponds the slider rotate connect in the connecting rod keep away from the mounting panel one end and with corresponding spout sliding connection, the spout is equipped with the guide bar along its length direction, the guide bar is located to the slider cover and with guide bar sliding connection, correspond the second spring housing is located corresponding guide bar and is fixed in and is kept away from between the lateral wall of the telescopic link of cylinder and the side of the telescopic link of cylinder is kept away from to the corresponding spout.

Through adopting above-mentioned technical scheme, when the mounting panel shifts down, the slip that two relative sliders can keep away from each other along the guide bar that corresponds in the spout that corresponds, and the second spring that corresponds plays the cushioning effect to the slider that corresponds.

The present invention may be further configured in a preferred embodiment as: the sliding groove is provided with two opposite convex blocks with the same length along the length direction of the sliding groove, the two convex blocks are respectively positioned on two opposite side walls of the sliding groove parallel to the length direction of the sliding groove, the top surfaces of the convex blocks are flush with the top surface of the connecting seat, the corresponding sliding blocks are provided with two opposite grooves matched with the two convex blocks, and the corresponding convex blocks are connected with the corresponding grooves in a sliding mode.

Through adopting above-mentioned technical scheme, through the cooperation of lug and recess, the sliding connection that the slider can be more stable in the spout.

The present invention may be further configured in a preferred embodiment as: the vertical portion of base is equipped with two relative connecting plates, the length direction of connecting plate is parallel with the length direction of base, the length of connecting plate equals with the length of base, the connecting plate bottom surface flushes with the bottom surface of the vertical portion of base, the box bottom surface is equipped with four spinal branch vaulting poles, vertical four the bracing piece is located four angle departments of box bottom surface respectively, four the one end that the box was kept away from to the bracing piece is connected respectively in the connecting plate top surface that corresponds.

Through adopting above-mentioned technical scheme, box bottom surface and two connecting plate top surfaces provide the position of installation for four spinal branch vaulting poles.

The present invention may be further configured in a preferred embodiment as: the connecting plate top surface is equipped with two relative sliding sleeves, the bracing piece that corresponds is located to the sliding sleeve cover, bracing piece and the sliding sleeve sliding connection who corresponds, the bracing piece is equipped with the ring that is close to in corresponding sliding sleeve, and is horizontal the ring is close to and is fixed between the side of sliding sleeve and the connecting plate top surface and be equipped with the third spring, the sliding sleeve is located to the third spring cover.

Through adopting above-mentioned technical scheme, jaw crusher carries out crushing during operation, and the third spring can cushion jaw crusher's vibration through compressing and reseing.

To sum up, the utility model discloses a following at least one useful technological effect:

1. when the jaw crusher needs to be moved, the working part of the moving mechanism can extend out of the bottom of the base and abut against the ground through the lifting function, so that the box body is supported, the bottom surface of the box body is spaced from the ground, and the working part of the moving mechanism in the shape of wheels can rotate, so that a worker can move the jaw crusher conveniently.

2. The base of the inverted U shape provides an installation position for the moving mechanism, and the universal wheels can extend out of the opening of the base under the control of the air cylinder.

3. When removing jaw crusher at the building site, first spring can play absorbing effect through compressing with reseing, and during the mounting panel displacement downwards, the slip that two relative sliders can be kept away from each other along the guide bar that corresponds in the spout that corresponds, and the second spring that corresponds plays the cushioning effect to the slider that corresponds.

Drawings

Fig. 1 is a schematic view showing the overall structure of a jaw crusher which is easy to move in this embodiment.

Fig. 2 is a sectional view of a jaw crusher which is easy to move in this embodiment.

Figure 3 is a cross-sectional view of another angle of the jaw crusher of this embodiment which is convenient to move.

Fig. 4 is a sectional view of the connector holder of the present embodiment.

Fig. 5 is a partially enlarged schematic view of a portion a in fig. 3.

In the figure, 1, a box body; 11. a base; 111. a connecting plate; 112. a sliding sleeve; 113. a collection box; 12. a feed inlet; 13. a discharge port; 14. a mounting seat; 141. a telescopic rod; 15. a support bar; 151. a circular ring; 152. a third spring; 2. a jaw plate is fixed; 3. moving the jaw plate; 4. an eccentric shaft; 5. a drive assembly; 51. a servo motor; 52. a driving wheel; 53. a belt; 6. a moving mechanism; 61. a cylinder; 62. a first dampening member; 621. a connecting seat; 622. a first spring; 63. a universal wheel; 7. a second dampening member; 71. mounting a plate; 72. a connecting rod; 73. a slider; 731. a groove; 74. a second spring; 75. a guide bar; 8. a chute; 81. and (4) a bump.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the jaw crusher convenient to move disclosed by the present invention, comprising a box body 1, a jaw fixing plate 2, a jaw moving plate 3, two opposite eccentric shafts 4, two opposite driving components 5 and four moving mechanisms 6, wherein the box body 1 is a hollow rectangular square body, a feeding port 12 is arranged on the top surface of the box body 1, the vertical jaw fixing plate 2 is fixed on the inner side wall of the box body 1, the two opposite eccentric shafts 4 are rotatably connected to the top of the box body 1, one side edge of the jaw moving plate 3 which is arranged in a downward inclination manner is connected between the two eccentric shafts 4, the box body 1 is provided with two sliding holes for moving the eccentric ends of the corresponding eccentric shafts 4, the sliding holes provide moving positions for the eccentric ends of the eccentric shafts 4, the jaw moving plate 3 is positioned in the box body 1 and opposite to the jaw fixing plate 2, the side edge of the jaw fixing plate 2 close to the feeding port 12 and the side edge of the jaw moving plate 3 close to, the bottom surface in the box body 1 is provided with a discharge port 13, the discharge port 13 is positioned below the jaw fixing plate 2 and the jaw moving plate 3, the bottom surface in the box body 1 is internally provided with a mounting seat 14 close to the jaw moving plate 3, the mounting seat 14 is rotatably connected with a telescopic rod 141 hinged with the side surface of the jaw moving plate 3 far away from the jaw fixing plate 2, the hinged part of the telescopic rod 141 and the jaw moving plate 3 is close to the side edge of the jaw moving plate 3 far away from the eccentric shaft 4, a driving component 5 for driving the eccentric shaft 4 is arranged at the top of the box body 1 and connected with the eccentric shaft 4, the bottom of the box body 1 is provided with a base 11, four moving mechanisms 6 with lifting function are arranged in the base 11 and are respectively close to four corners of the top surface of the base 11, the working part of the moving mechanism 6 for moving the jaw crusher vertically extends out of the base 11 and is abutted against the ground, the, through raising and lowering functions, the work portion of moving mechanism 6 can stretch out base 11 bottom and with ground butt to prop up box 1, make 1 bottom surface of box and ground have the interval, moving mechanism 6 is the work portion of wheel form and can rotates, thereby is convenient for the workman to remove jaw crusher.

Referring to fig. 3, the vertical cross-section of base 11 is the shape of the letter U of falling and there is the interval in its top surface and 1 bottom surface of box, the area of 11 top surfaces of base is less than the area of 1 bottom surface of box, the vertical portion of base 11 is equipped with two relative connecting plate 111, the length direction of connecting plate 111 is parallel with the length direction of base 11, the length of connecting plate 111 equals with the length of base 11, the bottom surface of connecting plate 111 bottom surface and the vertical portion of base 11 flush, 1 bottom surface of box is equipped with four spinal branch vaulting poles 15, four vertical spinal branch vaulting poles 15 are located four angle departments of 1 bottom surface of box respectively, the one end that box 1 was kept away from to four spinal branch vaulting poles 15 is connected respectively in the connecting plate 111 top surface that.

Referring to fig. 3, two relative sliding sleeves 112 are fixedly arranged on the top surface of the connecting plate 111, the corresponding supporting rod 15 is sleeved with the sliding sleeve 112, the supporting rod 15 is slidably connected with the corresponding sliding sleeve 112, the supporting rod 15 is provided with a circular ring 151 close to the corresponding sliding sleeve 112, a third spring 152 is fixedly arranged between the side surface of the horizontal circular ring 151 close to the sliding sleeve 112 and the top surface of the connecting plate 111, the sliding sleeve 112 is sleeved with the third spring 152, and when the jaw crusher is used for crushing, the third spring 152 is compressed and reset, so that the vibration of the jaw crusher can be buffered.

Referring to fig. 3, moving mechanism 6 includes cylinder 61, first damper 62 and universal wheel 63, cylinder 61 is fixed in the top surface of base 11, the vertical decurrent base 11 top surface of wearing to establish of telescopic link of cylinder 61 and be connected with first damper 62, universal wheel 63 is connected in the bottom of first damper 62, universal wheel 63 is close to the U font opening part of base 11, the base 11 of the shape of falling U provides the position of installation for moving mechanism 6, universal wheel 63 can stretch out from the opening part of base 11 under the control of cylinder 61.

Referring to fig. 3 and 4, first damper 62 includes connecting seat 621 and first spring 622, connecting seat 621 is the rectangle square body, connecting seat 621's top surface is worn to locate by the telescopic link of cylinder 61 and with connecting seat 621's top surface sliding connection, vertical first spring 622 is fixed in between the one end that the telescopic link of cylinder 61 is close to the bottom surface in connecting seat 621 and the bottom surface in the connecting seat 621, universal wheel 63 connects in the outer bottom surface of connecting seat 621, when removing jaw crusher in the building site, first spring 622 is through compressing and resetting, can play absorbing effect.

Referring to fig. 3 and 5, the telescopic rod of the cylinder 61 is provided with a second damping assembly 7 for further damping, the bottom of the second damping assembly 7 is connected with the top of the connecting seat 621, and the second damping assembly 7 can further damp, so that the burden of the first spring 622 is reduced, and the moving process of the jaw crusher can be smoother.

Referring to fig. 3 and 5, the second damping assembly 7 includes a mounting plate 71, two opposite connecting rods 72, two opposite sliding blocks 73 and two opposite second springs 74, the horizontal mounting plate 71 is fixedly sleeved on the telescopic rod of the cylinder 61 and is close to the outer top surface of the connecting seat 621, the length direction of the mounting plate 71 is parallel to the length direction of the connecting seat 621, the length of the mounting plate 71 is smaller than the length of the connecting seat 621, the two connecting rods 72 are respectively rotatably connected to two opposite side edges of the mounting plate 71, the top surface of the connecting seat 621 is provided with two opposite sliding grooves 8, the length direction of the sliding groove 8 is parallel to the length direction of the connecting seat 621, the corresponding sliding block 73 is rotatably connected to one end of the corresponding connecting rod 72 far from the mounting plate 71 and is slidably connected to the corresponding sliding groove 8, the sliding groove 8 is provided with a guide rod 75 along the length direction thereof, the, the corresponding second springs 74 are sleeved on the corresponding guide rods 75 and fixed between the side wall of the telescopic rod, far away from the air cylinder 61, of the corresponding sliding chute 8 and the side face of the telescopic rod, far away from the air cylinder 61, of the corresponding sliding block 73, when the mounting plate 71 moves downwards, the two opposite sliding blocks 73 can slide in the corresponding sliding chute 8 along the corresponding guide rods 75, and the corresponding second springs 74 play a role in buffering the corresponding sliding blocks 73.

Referring to fig. 4, the sliding groove 8 is provided with two opposite protrusions 81 having the same length as the sliding groove 8 along the length direction thereof, the two protrusions 81 are respectively located on two opposite side walls of the sliding groove 8 parallel to the length direction thereof, the top surface of the protrusion 81 is flush with the top surface of the connecting seat 621, the corresponding sliding block 73 is provided with two opposite grooves 731 adapted to the two protrusions 81, the width of the groove opening of the groove 731 is equal to the width of the protrusion 81, the depth of the groove 731 is equal to the height of the protrusion 81, the corresponding protrusion 81 is slidably connected to the corresponding groove 731, and the sliding block 73 can be more stably slidably connected to the sliding groove 8 by the cooperation of the protrusion 81 and the groove.

Referring to fig. 2, the top surface of the base 11 is provided with a collecting box 113 for loading the crushed material, the collecting box 113 is a rectangular square body, the top surface of the collecting box 113 is provided with a window, the collecting box 113 is located under the discharge port 13, and the collecting box 113 provides a placing space for the crushed material.

Referring to fig. 1, the driving assembly 5 includes two servo motors 51, two driving wheels 52 and two belts 53, the two opposite servo motors 51 are disposed on the outer side wall of the box 1 and respectively close to the corresponding eccentric shafts 4, the two driving wheels 52 are respectively fixedly sleeved on the output shafts of the corresponding servo motors 51, and the two belts 53 are respectively connected between the corresponding driving wheels 52 and the corresponding eccentric shafts 4.

The implementation principle of the embodiment is as follows: when the jaw crusher needs to be moved, the universal wheel 63 can be abutted against the ground and supports the base 11 through the air cylinder 61, a certain distance exists between the base 11 and the ground, so that the jaw crusher can be moved through the universal wheel 63, in the moving process, the universal wheel 63 passes through the uneven ground, the first spring 622 and the second spring 74 can be compressed, the first spring 622 and the second spring 74 are both compressed and reset to respectively buffer longitudinal vibration and transverse vibration, so that the shock absorption effect is realized, and therefore a worker can conveniently move the jaw crusher.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A jaw crusher convenient to move comprises a box body (1), a jaw fixing plate (2), a movable jaw plate (3), two opposite eccentric shafts (4) and two opposite driving components (5), wherein the vertical jaw fixing plate (2) is fixed on the inner side wall of the box body (1), the movable jaw plate (3) which is obliquely arranged is arranged in the box body (1) through the two opposite eccentric shafts (4) and is opposite to the jaw fixing plate (2), the two driving components (5) used for driving the two eccentric shafts (4) are arranged on the outer side wall of the box body (1) and are respectively connected with the corresponding eccentric shafts (4), the jaw crusher is characterized by further comprising four moving mechanisms (6), a base (11) is arranged at the bottom of the box body (1), the four moving mechanisms (6) with lifting function are arranged in the base (11) and are respectively close to four corners of the top surface of the base (11), the working part of the moving mechanism (6) used for moving the jaw crusher vertically extends out of the base (11) and is abutted against the ground, and the working part of the moving mechanism (6) is in a rotatable wheel shape.

2. The jaw crusher convenient to move according to claim 1, wherein the vertical section of the base (11) is in an inverted U shape, the top surface of the base is spaced from the bottom surface of the box body (1), the moving mechanism (6) comprises a cylinder (61), a first damping component (62) and a universal wheel (63), the cylinder (61) is fixed on the top surface of the base (11), an expansion rod of the cylinder (61) vertically penetrates through the top surface of the base (11) downwards and is connected with the first damping component (62), the universal wheel (63) is connected to the bottom of the first damping component (62), and the universal wheel (63) is close to the U-shaped opening of the base (11).

3. The jaw crusher convenient to move according to claim 2, wherein the first damping component (62) comprises a connecting seat (621) and a first spring (622), the telescopic rod of the air cylinder (61) penetrates through the top surface of the connecting seat (621) and is in sliding connection with the top surface of the connecting seat (621), the vertical first spring (622) is fixed between one end, close to the inner bottom surface of the connecting seat (621), of the telescopic rod of the air cylinder (61) and the inner bottom surface of the connecting seat (621), and the universal wheel (63) is connected to the outer bottom surface of the connecting seat (621).

4. A jaw crusher convenient to move according to claim 3, characterized in that the telescopic rod of the cylinder (61) is provided with a second damping member (7) for damping, and the bottom of the second damping member (7) is connected with the top of the connecting base (621).

5. The jaw crusher convenient to move according to claim 4, wherein the second damping assembly (7) comprises a mounting plate (71), two opposite connecting rods (72), two opposite sliding blocks (73) and two opposite second springs (74), the horizontal mounting plate (71) is fixedly connected to the telescopic rod of the air cylinder (61) and close to the connecting seat (621), the two connecting rods (72) are respectively and rotatably connected to two opposite side edges of the mounting plate (71), the top surface of the connecting seat (621) is provided with two opposite sliding grooves (8), the corresponding sliding blocks (73) are rotatably connected to one ends of the corresponding connecting rods (72) far away from the mounting plate (71) and are in sliding connection with the corresponding sliding grooves (8), the sliding grooves (8) are provided with guide rods (75) along the length direction of the sliding grooves, and the sliding blocks (73) are sleeved on the guide rods (75) and are in sliding connection with the guide rods (75), the corresponding second spring (74) is sleeved on the corresponding guide rod (75) and fixed between the side wall of the telescopic rod, far away from the air cylinder (61), of the corresponding sliding chute (8) and the side face of the telescopic rod, far away from the air cylinder (61), of the corresponding sliding block (73).

6. A jaw crusher convenient to move according to claim 5, characterized in that the chute (8) is provided with two opposite projections (81) along the length direction thereof, the length of the two projections being equal to the length of the chute, the two projections (81) are respectively positioned on two opposite side walls of the chute (8) parallel to the length direction thereof, the top surfaces of the projections (81) are flush with the top surface of the connecting seat (621), the corresponding slide block (73) is provided with two opposite grooves (731) adapted to the two projections (81), and the corresponding projections (81) are slidably connected to the corresponding grooves (731).

7. The jaw crusher convenient to move according to claim 1, characterized in that the vertical part of the base (11) is provided with two opposite connecting plates (111), the length direction of the connecting plates (111) is parallel to the length direction of the base (11), the length of the connecting plates (111) is equal to that of the base (11), the bottom surface of the connecting plates (111) is flush with the bottom surface of the vertical part of the base (11), the bottom surface of the box body (1) is provided with four supporting rods (15), the four vertical supporting rods (15) are respectively positioned at four corners of the bottom surface of the box body (1), and one ends of the four supporting rods (15) far away from the box body (1) are respectively connected to the top surfaces of the corresponding connecting plates (111).

8. The jaw crusher convenient to move according to claim 7, characterized in that two opposite sliding sleeves (112) are arranged on the top surface of the connecting plate (111), the corresponding support rods (15) are sleeved with the sliding sleeves (112), the support rods (15) are slidably connected with the corresponding sliding sleeves (112), the support rods (15) are provided with circular rings (151) close to the corresponding sliding sleeves (112), a third spring (152) is fixedly arranged between the side surface of the horizontal circular ring (151) close to the sliding sleeves (112) and the top surface of the connecting plate (111), and the sliding sleeves (112) are sleeved with the third spring (152).