CN210179631U - Aluminum alloy clamp for liquefaction gun - Google Patents

Abstract

The utility model relates to a liquefaction rifle aluminum alloy clip, including base plate and the first clamping components who is used for pressing from both sides tight liquefaction rifle pole that sets up on the base plate, first clamping components include the first stand perpendicular with the base plate and with base plate sliding connection, fix on the first stand with the mounting panel that the base plate is parallel, with mounting panel articulated first splint, second splint, fix on first riser, second riser on the mounting panel, set up the first spring between first riser and first splint and set up the second spring between second riser and second splint, first splint with the second splint are the arc elastic plate, first riser with the second riser symmetry is fixed and all perpendicular with the mounting panel; one end of the first spring is fixed with the first vertical plate, the other end of the first spring is fixed with the first clamping plate, one end of the second spring is fixed with the second vertical plate, the other end of the second spring is fixed with the second clamping plate, the liquefied gun is convenient to take and place, the consumed time is short, and the construction efficiency is high.

Description

Aluminum alloy clamp for liquefaction gun

Technical Field

The utility model belongs to the technical field of the technique of liquefaction rifle and specifically relates to a liquefaction rifle aluminum alloy clip is related to.

Background

The liquefying gun is a heating and welding tool using liquefied gas as fuel, can reach 1300 ℃ of high temperature when being correctly used, and has the characteristics of low cost, safety, convenience, no pollution and stable performance. The method is suitable for various fields such as metal material welding, mechanical part heating treatment, mud core baking in the casting industry, roof leakage repairing (asphalt melting), wooden boat maintenance (drying), meat processing (hair removal), communication cable maintenance, jewelry processing and the like. The liquefaction rifle will close the burning things which may cause a fire disaster during intermittent type and place subaerial, greatly reduced efficiency of construction, consequently need set up a clip, has a support in intermittent type construction, leaves the rifle head on ground to guarantee that the slow fire makes progress, take up during the use and can use immediately, improve the efficiency of construction, need not frequent ignition.

Chinese patent with publication number CN204313280U discloses a liquefaction rifle aluminum alloy clip, including the clamping piece of two symmetries, the common one end of clamping piece links together through the connecting piece, forms the structure of chevron shape or Y font after two clamping pieces are connected, and this utility model has a support in construction intermittent type construction, leaves ground with its rifle head to guarantee that the fire is a little upwards, avoid dangerous.

The above prior art solutions have the following drawbacks: set up two clamping pieces and be used for pressing from both sides tight liquefaction rifle, when using the liquefaction rifle, use bolted connection together with two clamping pieces earlier, then place the liquefaction rifle between two clamping pieces, again with the bolt tightening for the clamping piece, though the clamping piece can support the liquefaction rifle, nevertheless to the construction of intermittent type nature, need frequently twist and move the bolt and get and put the liquefaction rifle, there is the problem that the efficiency of construction is low equally.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a liquefaction rifle aluminum alloy clip has the effect that conveniently gets to put liquefaction rifle, efficiency of construction height.

The above technical purpose of the present invention can be achieved by the following technical solutions: an aluminum alloy clamp for a liquefaction gun comprises a base plate and a first clamping assembly arranged on the base plate and used for clamping a gun rod of the liquefaction gun, wherein the first clamping assembly comprises a first upright column which is vertical to the base plate and is in sliding connection with the base plate, a mounting plate which is fixed on the first upright column and is parallel to the base plate, a first clamping plate which is hinged with the mounting plate, a second clamping plate, a first vertical plate and a second vertical plate which are fixed on the mounting plate, a first spring which is arranged between the first vertical plate and the first clamping plate and a second spring which is arranged between the second vertical plate and the second clamping plate, the first clamping plate and the second clamping plate are both arc-shaped elastic plates, and the first vertical plate and the second vertical plate are symmetrically fixed and are both vertical to the mounting plate; one end of the first spring is fixed with the first vertical plate, the other end of the first spring is fixed with the first clamping plate, one end of the second spring is fixed with the second vertical plate, and the other end of the second spring is fixed with the second clamping plate.

Through adopting above-mentioned technical scheme, when the construction needs intermittent operation, transfer the liquefaction rifle to the little fire, guarantee that the little fire makes progress, then place the barral of a gun between first splint and second splint. The first spring and the second spring are always in a compressed state, the elastic force of the first spring points to the first clamping plate, the elastic force of the second spring points to the second clamping plate, the first clamping plate and the second clamping plate rotate towards the direction close to each other, and the liquefaction gun rod is located between the first clamping plate and the second clamping plate and is clamped. When taking out the liquefaction rifle, first splint rotate to the direction of keeping away from each other with the second splint, and the getting of liquefaction rifle is put conveniently, and weak point consuming time, the efficiency of construction is high.

The utility model discloses further set up to: the upper end surface of the base plate is provided with a sliding groove along the length direction of the base plate, and the lower end of the first upright post is fixedly provided with a first sliding block in sliding fit with the sliding groove; the first sliding block limits sliding of the first sliding block through the first fixing component.

Through adopting above-mentioned technical scheme, first slider and spout sliding fit conveniently remove first clamping component's position, remove to suitable position after, through the fixed first slider of first fixed subassembly.

The utility model discloses further set up to: the first fixing assembly comprises first threaded holes symmetrically formed in the sliding block and penetrating through the upper end face and the lower end face of the sliding block and first bolts in threaded connection with the first threaded holes, and the first bolts are butterfly bolts.

Through adopting above-mentioned technical scheme, when needing to adjust first clamping component's position, the first slider that slides drives first stand and removes, and first stand removes to suitable position after, rotatory first bolt to first bolt lower extreme and spout diapire butt, and first bolt can't continue to slide this moment. The first bolt is a butterfly bolt, so that labor is saved and the operation is convenient when the first bolt is manually operated to rotate.

The utility model discloses further set up to: the spout runs through its length direction's both ends, and the spout cross-section is the T type.

Through adopting above-mentioned technical scheme, the spout link up to be seted up, makes things convenient for first slider to slide into the spout, and the spout sets up to the T type, avoids first slider to break away from the spout at the slip in-process, guarantees the normal use of clip.

The utility model discloses further set up to: the base plate is also provided with a second clamping assembly for clamping a handle of the liquefaction gun, the second clamping assembly comprises a second upright column which is perpendicular to the base plate and is in sliding connection with the base plate, a U-shaped frame which is fixed on the second upright column and elastic pieces which are symmetrically fixed on the side walls of two sides of the U-shaped frame, the elastic pieces are arc-shaped plates, the upper ends of the two elastic pieces are fixed with the upper end of the U-shaped frame, and the lower ends of the two elastic pieces are free ends; the horizontal distance of the upper ends of the two elastic pieces is larger than the horizontal distance of the center of the arc between the two elastic pieces.

Through adopting above-mentioned technical scheme, set up the second and press from both sides tight subassembly and can further stabilize the support liquefaction rifle, avoid liquefaction rifle focus unstability, slope between first splint and second splint. When the second clamping assembly is used, the gun handle is placed between the two elastic pieces, and under the elastic action of the elastic pieces, the gun handle can be clamped tightly, the liquefying gun can be conveniently taken out through the arrangement, and the liquefying gun is guaranteed to be conveniently taken out and placed.

The utility model discloses further set up to: a second sliding block in sliding fit with the sliding groove is fixed at the lower end of the second upright post, and the second sliding block is limited to slide through a second fixing component; the second fixing assembly comprises a second threaded hole formed in the second sliding block and penetrating through the upper end face and the lower end face of the second sliding block, and a second bolt in threaded fit with the second threaded hole, and the second bolt is a butterfly bolt.

Through adopting above-mentioned technical scheme, when needing according to liquefaction rifle length adjustment second clamping component position, the second slider that slides drives the second stand and removes, removes to suitable position after, rotates the second bolt and supports tight spout diapire to second bolt lower extreme, so the second slider can't continue to slide again, when needing to slide, to opposite direction rotate the second bolt to the second bolt lower extreme break away from the spout diapire can. The second bolt is a butterfly bolt, so that labor is saved and the operation is convenient when the second bolt is manually operated to rotate.

The utility model discloses further set up to: the base plate is also provided with a protection assembly for protecting the head of the liquefaction gun, the protection assembly comprises a third upright column which is vertical to the base plate and is in sliding connection with the base plate, an obliquely arranged connecting rod which is fixed at one end of the third upright column, which is far away from the base plate, and a protection cover which is fixed on the connecting rod and is used for covering the wall head, and the protection cover comprises an inner cover and an outer cover; inner radiating holes are evenly formed in the circumferential side wall of the inner cover, the bottom plate of the inner cover is an entity, and outer radiating holes are formed in the side wall of the outer cover and the bottom plate.

Through adopting above-mentioned technical scheme, the inner cover of protection casing is outside the rifle head, and the heat effluvium that the interior louvre and the outer louvre of seting up are favorable to the protection casing avoids the protection casing bulk temperature overheated, scalds operating personnel, guarantees operation process's security, and the inner cover bottom plate sets up to the entity and avoids the rifle head to spill over outside the protection casing on a slow fire.

The utility model discloses further set up to: a third sliding block in sliding fit with the sliding groove is fixed at the lower end of the third upright post, and the third sliding block is limited to slide by a third fixing component; the third fixing assembly comprises a third threaded hole formed in the third sliding block and penetrating through the upper end face and the lower end face of the third sliding block, and a third bolt in threaded fit with the third threaded hole, and the third bolt is a butterfly bolt.

Through adopting above-mentioned technical scheme, the liquefaction rifle is different in size, according to work progress liquefaction rifle actual size, slides the third slider and makes the protection casing cover establish on the rifle head, guarantees the protective effect of protection casing. After the third sliding block slides to a proper position, the third bolt is rotated to abut against the bottom wall of the sliding groove, so that the third sliding block cannot slide any more, the third bolt is a butterfly bolt, and the third bolt is operated manually, so that labor is saved and the operation is convenient.

To sum up, the utility model discloses a beneficial technological effect does:

1. the first spring and the second spring are always in a compressed state, the elastic force of the first spring points to the first clamping plate, the elastic force of the second spring points to the second clamping plate, the first clamping plate and the second clamping plate rotate in a direction close to each other, the liquefaction gun rod is positioned between the first clamping plate and the second clamping plate so as to be clamped, when the liquefaction gun is taken out, the first clamping plate and the second clamping plate rotate in a direction far away from each other, the taking and the placing of the liquefaction gun are convenient, the consumed time is short, and the construction efficiency is high;

2. the second clamping assembly is arranged to further stably support the liquefaction gun, so that the gravity center of the liquefaction gun is prevented from being unstable, the liquefaction gun is inclined between the first clamping plate and the second clamping plate, when the second clamping assembly is used, the gun handle is placed between the two elastic pieces, and can be clamped under the elastic action of the elastic pieces, and the liquefaction gun can be conveniently taken out, so that the liquefaction gun is conveniently taken out and placed;

3. the inner cover of protection casing is outside the rifle head, and the heat effluvium that the interior louvre and the outer louvre of seting up are favorable to the protection casing avoids the protection casing bulk temperature overheated, scalds operating personnel, guarantees operation process's security.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of a first clamping assembly of the present invention;

fig. 3 is a schematic structural view of a second clamping assembly of the present invention;

fig. 4 is a schematic structural diagram of the protection assembly of the present invention.

Reference numerals: 1. a substrate; 11. a chute; 2. a first clamping assembly; 21. a first upright post; 211. a first slider; 22. mounting a plate; 23. a first splint; 24. a second splint; 25. a first vertical plate; 26. a second vertical plate; 27. a first spring; 28. a second spring; 3. a second clamping assembly; 31. a second upright post; 311. a second slider; 32. a U-shaped frame; 33. an elastic sheet; 4. a guard assembly; 41. a third column; 411. a third slider; 42. a connecting rod; 43. a protective cover; 431. an inner cover; 4311. internal heat dissipation holes; 432. a housing; 4321. an outer heat dissipation aperture; 5. a first fixed component; 51. a first threaded hole; 52. a first bolt; 6. a second fixed component; 61. a second threaded hole; 62. a second bolt; 7. a third fixed component; 71. a third threaded hole; 72. and a third bolt.

Detailed Description

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

Referring to fig. 1, for the utility model discloses a liquefaction rifle aluminum alloy clip, including base plate 1, set up the first clamping component 2 that is used for pressing from both sides tight liquefaction rifle bar on base plate 1, set up the second clamping component 3 that is used for pressing from both sides tight liquefaction rifle handle on base plate 1 and set up the protection component 4 that is used for protecting the liquefaction rifle head on base plate 1. The substrate 1 is in a shape of a rectangular parallelepiped, a chute 11 having a T-shaped cross section is formed in the substrate 1, a length direction of the chute 11 is identical to a length direction of the substrate 1, and the chute 11 penetrates through both ends of the substrate 1 in the length direction.

As shown in fig. 2, the first clamping assembly 2 includes a first upright 21, a mounting plate 22, a first clamping plate 23, a second clamping plate 24, a first upright plate 25, a second upright plate 26, a first spring 27, and a second spring 28, wherein the first upright 21 is perpendicular to the base plate 1 and is slidably connected to the base plate 1. Mounting panel 22 is parallel with base plate 1 and mounting panel 22 fixes the one end of keeping away from base plate 1 at first stand 21, and first splint 23 articulates on mounting panel 22 with second splint 24 symmetry, and first splint 23 is the arc elastic plate with second splint 24, and first riser 25 and second riser 26 are fixed respectively at the both ends of mounting panel 22, and first riser 25 and second riser 26 are all perpendicular with mounting panel 22. One end of the first spring 27 is fixed to the first vertical plate 25, the other end is fixed to the first clamping plate 23, one end of the second spring 28 is fixed to the second vertical plate 26, and the other end is fixed to the second clamping plate 24.

As shown in fig. 2, a first sliding block 211 in sliding fit with the sliding groove 11 is fixed at the lower end of the first upright 21, the first sliding block 211 is limited to slide by the first fixing component 5, the first fixing component 5 includes a first threaded hole 51 and a first bolt 52, the first threaded hole 51 is symmetrically formed in the first sliding block 211, the first threaded hole 51 penetrates through the upper end surface and the lower end surface of the first sliding block 211, the first bolt 52 is in threaded fit with the first threaded hole 51, and the first bolt 52 is a butterfly bolt. When the position of the first clamping assembly 2 needs to be adjusted, the first sliding block 211 is slid to drive the first upright post 21 to move, and after the first upright post 21 is moved to a proper position, the first bolt 52 is rotated until the lower end of the first bolt 52 abuts against the bottom wall of the sliding groove 11, and at this time, the first bolt 52 cannot slide any more. The first bolt 52 is a butterfly bolt, so that labor is saved and the operation is convenient when the first bolt 52 is manually operated to rotate.

As shown in fig. 3, the second clamping assembly 3 includes a second upright 31, a U-shaped frame 32 and an elastic piece 33, wherein the second upright 31 is perpendicular to the base plate 1 and is slidably connected to the base plate 1. The opening of the U-shaped frame 32 is upward, the U-shaped frame 32 is fixed at one end of the second upright column 31 far away from the base plate 1, two elastic pieces 33 are arranged, and the two elastic pieces 33 are respectively fixed on the side walls at two sides of the U-shaped frame 32. The elastic pieces 33 are arc-shaped plates, the upper ends of the two elastic pieces 33 are fixed with the upper end of the U-shaped frame 32, the lower ends of the two elastic pieces 33 are free ends, and the horizontal distance between the upper ends of the two elastic pieces 33 is larger than the horizontal distance between the centers of the arcs between the two elastic pieces 33.

As shown in fig. 3, a second sliding block 311 slidably engaged with the sliding groove 11 is fixed at the lower end of the second upright 31, and the second sliding block 311 is limited to slide by the second fixing component 6. The second fixing assembly 6 comprises a second threaded hole 61 and a second bolt 62, the second threaded hole 61 is formed in the second sliding block 311, the second threaded hole 61 penetrates through the upper end face and the lower end face of the second sliding block 311, the second bolt 62 is in threaded fit with the second threaded hole 61, and the second bolt 62 is a butterfly bolt. When the position of the second clamping component 3 needs to be adjusted according to the length of the liquefaction gun, the second sliding block 311 slides to drive the second upright post 31 to move, and after the second upright post moves to a proper position, the second sliding block 311 cannot slide any more until the lower end of the second bolt 62 abuts against the bottom wall of the sliding groove 11, and when the second clamping component needs to slide, the second sliding block 311 rotates the second bolt 62 to the opposite direction until the lower end of the second bolt 62 is separated from the bottom wall of the sliding groove 11. The second bolt 62 is a butterfly bolt, so that labor is saved and operation is facilitated when the second bolt 62 is manually operated to rotate.

As shown in fig. 4, the protection assembly 4 includes a third column 41, a connecting rod 42 and a protection cover 43, the third column 41 is perpendicular to the substrate 1 and is slidably connected to the substrate 1, the connecting rod 42 is disposed in an inclined manner, a high end of the connecting rod 42 is fixed to an end of the third column 41 away from the substrate 1, and a low end of the connecting rod 42 is fixed to the protection cover 43. The protection casing 43 covers on the liquefaction rifle head, and the protection casing 43 includes inner cover 431 and dustcoat 432, and inner cover 431 is fixed with dustcoat 432, has evenly seted up interior louvre 4311 on the circumference lateral wall of inner cover 431, and the bottom plate of inner cover 431 is real board, has all seted up outer louvre 4321 on the circumference lateral wall of dustcoat 432 and the bottom plate. The inner cover 431 of protection casing 43 covers outside the rifle head, and the interior louvre 4311 and the outer louvre 4321 of seting up are favorable to the heat effluvium of protection casing 43, avoid protection casing 43 bulk temperature overheated, scald operating personnel, guarantee operation process's security, and inner cover 431 bottom plate sets up to the entity and avoids the rifle head to be fired a little and spill over outside protection casing 43.

As shown in fig. 4, a third slider 411 slidably engaged with the sliding groove 11 is fixed to a lower end of the third column 41, and the third slider 411 is restricted from sliding by the third fixing member 7. The third fixing assembly 7 comprises a third threaded hole 71 and a third bolt 72, the third threaded hole 71 is formed in the third sliding block 411, the third threaded hole 71 penetrates through the upper end face and the lower end face of the third sliding block 411, the third bolt 72 is in threaded connection with the third threaded hole 71, and the third bolt 72 is a butterfly bolt. Liquefaction rifle is different in size, according to the work progress liquefaction rifle actual size, slides third slider 411 and makes protection casing 43 cover establish on the rifle head, guarantees the protective effect of protection casing 43. After the third sliding block 411 is slid to a proper position, the third bolt 72 is rotated to the third bolt 72 to tightly abut against the bottom wall of the sliding groove 11, so that the third sliding block 411 cannot slide any more, the third bolt 72 is a butterfly bolt, and the third bolt 72 is operated manually, so that labor is saved and the operation is convenient.

The implementation principle of the embodiment is as follows: when the construction needs intermittent operation, the liquefaction gun is adjusted to the low fire, the low fire is ensured to be upward, and then the gun rod is placed between the first clamping plate 23 and the second clamping plate 24. The first spring 27 and the second spring 28 are always in a compressed state, the elastic force of the first spring 27 is directed to the first clamp plate 23, the elastic force of the second spring 28 is directed to the second clamp plate 24, the first clamp plate 23 and the second clamp plate 24 rotate in the direction of approaching each other, and the liquefied gun rod is positioned between the first clamp plate 23 and the second clamp plate 24 and is clamped. When the liquefaction gun is taken out, the first clamping plate 23 and the second clamping plate 24 rotate towards the direction away from each other, the liquefaction gun is convenient to take and place, the time consumption is short, and the construction efficiency is high. Set up second clamping component 3 and can further stabilize the support liquefaction rifle, avoid liquefaction rifle focus unstability, slope between first splint 23 and second splint 24. When the second clamping assembly 3 is used, the gun handle is placed between the two elastic sheets 33, the gun handle can be clamped under the elastic action of the elastic sheets 33, the liquefying gun is conveniently taken out, and the liquefying gun is convenient to take and place.

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 (8)

1. The utility model provides a liquefaction rifle aluminum alloy clip, includes base plate (1) and sets up first clamping component (2) that are used for pressing from both sides tight liquefaction rifle bar on base plate (1), its characterized in that: the first clamping assembly (2) comprises a first upright post (21) which is perpendicular to the base plate (1) and is in sliding connection with the base plate (1), a mounting plate (22) which is fixed on the first upright post (21) and is parallel to the base plate (1), a first clamping plate (23) which is hinged to the mounting plate (22), a second clamping plate (24), a first vertical plate (25) which is fixed on the mounting plate (22), a second vertical plate (26), a first spring (27) which is arranged between the first vertical plate (25) and the first clamping plate (23), and a second spring (28) which is arranged between the second vertical plate (26) and the second clamping plate (24), wherein the first clamping plate (23) and the second clamping plate (24) are both arc-shaped elastic plates, and the first vertical plate (25) and the second vertical plate (26) are symmetrically fixed and are both perpendicular to the mounting plate (22); one end of the first spring (27) is fixed with the first vertical plate (25), the other end of the first spring is fixed with the first clamping plate (23), one end of the second spring (28) is fixed with the second vertical plate (26), and the other end of the second spring is fixed with the second clamping plate (24).

2. The aluminum alloy clip for a liquefaction gun of claim 1, wherein: a sliding groove (11) is formed in the upper end face of the base plate (1) along the length direction of the base plate, and a first sliding block (211) in sliding fit with the sliding groove (11) is fixed at the lower end of the first upright post (21); the first sliding block (211) is limited to slide through the first fixing component (5).

3. The aluminum alloy clip for a liquefaction gun of claim 2, wherein: the first fixing component (5) comprises first threaded holes (51) which are symmetrically formed in the sliding block and penetrate through the upper end face and the lower end face of the sliding block and first bolts (52) in threaded connection with the first threaded holes (51), and the first bolts (52) are butterfly bolts.

4. The aluminum alloy clip for a liquefaction gun of claim 2, wherein: the sliding groove (11) penetrates through two ends of the sliding groove in the length direction, and the section of the sliding groove (11) is T-shaped.

5. The aluminum alloy clip for a liquefaction gun of claim 2, wherein: the base plate (1) is further provided with a second clamping assembly (3) for clamping a handle of a liquefaction gun, the second clamping assembly (3) comprises a second upright post (31) which is perpendicular to the base plate (1) and is in sliding connection with the base plate (1), a U-shaped frame (32) fixed on the second upright post (31) and elastic pieces (33) symmetrically fixed on the side walls of two sides of the U-shaped frame (32), the elastic pieces (33) are arc-shaped plates, the upper ends of the two elastic pieces (33) are fixed with the upper end of the U-shaped frame (32), and the lower ends of the two elastic pieces are free ends; the horizontal distance between the upper ends of the two elastic pieces (33) is larger than the horizontal distance between the centers of the arcs in the middle of the two elastic pieces (33).

6. The aluminum alloy clip for a liquefaction gun of claim 5, wherein: a second sliding block (311) in sliding fit with the sliding groove (11) is fixed at the lower end of the second upright post (31), and the sliding of the second sliding block (311) is limited by a second fixing component (6); the second fixing component (6) comprises a second threaded hole (61) formed in the second sliding block (311) and penetrating through the upper end face and the lower end face of the second sliding block, and a second bolt (62) in threaded fit with the second threaded hole (61), and the second bolt (62) is a butterfly bolt.

7. The aluminum alloy clip for a liquefaction gun of claim 2, wherein: the base plate (1) is further provided with a protection assembly (4) for protecting the head of the liquefaction gun, the protection assembly (4) comprises a third upright column (41) which is perpendicular to the base plate (1) and is in sliding connection with the base plate (1), a connecting rod (42) which is fixed at one end, far away from the base plate (1), of the third upright column (41) and is obliquely arranged, and a protection cover (43) which is fixed on the connecting rod (42) and is used for covering the wall head, and the protection cover (43) comprises an inner cover (431) and an outer cover (432); interior louvre (4311) have evenly been seted up on the circumference lateral wall of inner cover (431), the bottom plate of inner cover (431) is the entity, outer louvre (4321) have all been seted up on lateral wall and the bottom plate of dustcoat (432).

8. The aluminum alloy clip for a liquefaction gun of claim 7, wherein: a third sliding block (411) in sliding fit with the sliding groove (11) is fixed at the lower end of the third upright post (41), and the third sliding block (411) is limited to slide through a third fixing component (7); the third fixing assembly (7) comprises a third threaded hole (71) formed in the third sliding block (411) and penetrating through the upper end face and the lower end face of the third sliding block and a third bolt (72) in threaded fit with the third threaded hole (71), and the third bolt (72) is a butterfly bolt.

Images