CN114993775A

CN114993775A - Sampling frame convenient to adjust

Info

Publication number: CN114993775A
Application number: CN202210919699.6A
Authority: CN
Inventors: 董泽林; 王志垚; 刘芳名; 张丹; 闫柏霖; 张媛; 檀海兵
Original assignee: Aolai Guoxin Beijing Testing & Detection Technology Co ltd
Current assignee: Aolai Guoxin Beijing Testing & Detection Technology Co ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-09-02
Anticipated expiration: 2042-08-02
Also published as: CN114993775B

Abstract

The invention discloses a sampling frame convenient to adjust, which comprises a base, a floating adjusting mechanism, a supporting plate, an installing disc, an upper adjusting mechanism, a lower supporting rod, a sheath, a fixing port, a fixing screw rod, a middle supporting rod, an upper supporting rod and an upper clamping mechanism, wherein the fixing port is provided with the fixing screw rod, the upper supporting rod is arranged in the middle supporting rod, the top of the upper supporting rod is provided with the supporting plate, the supporting plate is provided with the upper adjusting mechanism, and the upper clamping mechanism is connected above the upper adjusting mechanism, so that the sampling frame has the advantages that: such device structure section of thick bamboo is single, and convenient to use can be according to the adjustment of the high freedom in sampling area, and collapsible shrink is convenient for store up and remove, simultaneously, can be to the sampling needs of different angles, and the angle of omnidirectional regulation sampling rifle makes its position of aiming at the sampling mouth, guarantees the accuracy of sampling, reduces the error, and conveniently presss from both sides tight work to the sampling rifle.

Description

Sampling frame convenient to adjust

Technical Field

The invention relates to the technical field of gas collection and detection equipment, in particular to a sampling frame convenient to adjust.

Background

In modern society, due to the use of a large amount of materials such as coal, fuel oil and the like, the air pollution condition of modern society is very serious, the air pollution can cause great influence on the growth and the life of human bodies, animals and plants, and extreme weather and climate such as acid rain, acid mist and the like can be caused.

Need gather gaseous sample of pollution before detecting, the sampling rifle is a instrument commonly used, when using the sampling rifle, the measurement personnel need lift the sampling rifle with the hand for a long time and sample, the centre has the artificial error inevitably, can influence the accuracy of testing result, and because personnel are close to the waste gas source for a long time, very easily cause the influence to measurement personnel's healthy, and the sampling head is not firm enough when placing in addition, and holistic dismouting is difficult.

An effective solution to the problems in the related art has not been proposed yet.

Disclosure of Invention

The present invention is directed to a sampling frame with convenient adjustment, so as to overcome the above-mentioned problems in the related art.

The technical scheme of the invention is realized as follows:

the utility model provides a sampling frame convenient to adjust, includes base, unsteady adjustment mechanism, backup pad, mounting disc, goes up adjustment mechanism, lower support bar, sheath, fixed port, clamping screw, well bracing piece, goes up the bracing piece, goes up clamping mechanism, pass through on the base the mounting disc is connected with the lower support bar, the externally mounted of lower support bar has the sheath, well bracing piece is installed in the lower support bar, well bracing piece with the upper end of lower support bar is provided with the fixed port, install on the fixed port clamping screw, go up the bracing piece and install in well bracing piece, go up the top of bracing piece and install the backup pad, install adjustment mechanism in the backup pad, it is connected with clamping mechanism to go up the adjustment mechanism top.

Furthermore, the upper adjusting mechanism comprises a first bearing sleeve installed on the supporting plate, an inner ring of the first bearing sleeve is connected with a first rotating sleeve rod, the outer rotating sleeve rod is movably sleeved with a second outer rotating sleeve rod, the outer rotating sleeve rod is sleeved with a second bearing sleeve, L-shaped supports connected with the supporting plate are symmetrically arranged on outer rings of the second bearing sleeve rods, a first turbine is fixedly sleeved outside the first rotating sleeve rod, a second turbine is fixedly sleeved outside the second rotating sleeve rod, a first motor and a second motor are respectively installed on the supporting plate, a first worm matched with the first turbine is arranged at the output end of the first motor, a second worm matched with the second turbine is arranged at the output end of the second motor, a U-shaped connecting plate is connected to the top of the first rotating sleeve rod, a first bevel gear is movably arranged in the U-shaped connecting plate by extending the top of the first rotating sleeve rod, a rotating rod is movably arranged between the U-shaped connecting plates, a bevel gear II matched with the bevel gear I is installed on the rotating rod, a rotating block is fixedly arranged on the rotating rod, and a supporting rod is arranged at the top of the rotating block.

Further, go up clamping mechanism and include PMKD, PMKD with bracing piece fixed connection, the last four guide posts of installing of PMKD, the PMKD top is passed through guide post swing joint has the fly leaf, the top of guide post is equipped with presss from both sides tight mesa, the last hydraulic telescoping cylinder of installing of PMKD, the movable groove has been seted up to the symmetry on the tight mesa of clamp, it is located to press from both sides tight mesa bottom the bilateral symmetry in movable groove is equipped with the clamp splice, the activity is equipped with the dwang between the clamp splice, be equipped with the arc clamp splice on the dwang, the bottom of arc clamp splice pass through the loose axle with fly leaf swing joint, the top of arc clamp splice is equipped with the slope limiting plate.

Furthermore, the floating adjusting mechanism comprises three through holes formed in the base, threaded rods are movably arranged in the through holes in a penetrating mode, threaded sleeves are sleeved on the upper side and the lower side of the threaded rods, the bottom of each threaded rod is movably connected with a semicircular shell through a rotating ball, and a supporting bottom plate is arranged at the bottom of each semicircular shell.

Furthermore, the middle support rod can freely move up and down in the lower support rod, and the upper support rod can freely move up and down in the middle support rod and is fixed through the fixing screw rod.

Furthermore, the slope limiting plate include with the fixed plate that the arc clamp splice is connected, one side of fixed plate is connected with the locating plate through the cushion, the constant head tank has been seted up on the locating plate.

The invention provides a sampling frame convenient to adjust, which has the following beneficial effects:

the middle supporting rod can freely move up and down in the lower supporting rod, the upper supporting rod can freely move up and down in the middle supporting rod and is fixed through the fixing screw rod, so that the integral height of the sampling frame can be freely adjusted according to the height of a sampling area, the sampling frame can be folded and contracted to be convenient for storage and movement, under the action of the upper adjusting mechanism, when the requirement of adopting and detecting different angles is met, the first worm is driven to rotate by the first motor, so that the inner rotating sleeve rod rotates, the second bevel gear is driven to rotate by the bevel gear, so that the rotating block adjusts the angle of the supporting rod, meanwhile, the second motor can be started to drive the second worm to rotate, so that the second worm drives the outer rotating sleeve rod to rotate under the action of the second bearing sleeve, so that the U-shaped connecting plate at the top of the outer rotating sleeve rod rotates, and the whole U-shaped connecting plate rotates, the angular rotation of cooperation bracing piece, the angle that makes PMKD can all-round regulation, when installing the sampling rifle, at first place the collection rifle on pressing from both sides tight mesa, and be located between two arc clamp blocks, at this moment, return through hydraulic telescoping cylinder and contract, make the fly leaf descend under the effect of guide post, thereby make the loose axle drive the arc clamp block and inwards press from both sides tightly under the effect of dwang, thereby carry out the clamping work to the sampling rifle that lies in between the arc clamp block, such device structure bobbin sheet, high durability and convenient use, can be according to the adjustment of the high freedom in sampling area, collapsible shrink is convenient for store up and remove, and simultaneously, can be directed against the sampling needs of different angles, the angle of omnidirectional regulation sampling rifle, make its position of aiming at the sampling mouth, guarantee the accuracy of sampling, reduce the error, and conveniently carry out the clamping work to the sampling rifle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a sample rack that facilitates adjustment according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an upper adjustment mechanism in a sampling rack for facilitating adjustment according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the construction of an upper clamping mechanism in a sampling rack that facilitates adjustment according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a floating adjustment mechanism in a sampling rack for facilitating adjustment according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an inclined limiting plate in a sampling frame convenient to adjust according to an embodiment of the invention.

In the figure:

1. a base; 2. a floating adjustment mechanism; 3. a support plate; 4. installing a disc; 5. an adjustment mechanism; 6. a lower support bar; 7. a sheath; 8. a fixed port; 9. fixing the screw rod; 10. a middle support rod; 11. an upper support rod; 12. an upper clamping mechanism; 13. a first bearing sleeve; 14. rotating the loop bar; 15. a second bearing sleeve; 16. an L-shaped bracket; 17. a first turbine; 18. a second turbine; 19. a second motor; 20. a first motor; 21. a second worm; 22. a first worm; 23. rotating the loop bar outwards; 24. a U-shaped connecting plate; 25. a first bevel gear; 26. a rotating rod; 27. a second bevel gear; 28. rotating the block; 29. a support bar; 30. fixing the bottom plate; 31. a guide post; 32. a movable plate; 33. clamping the table top; 34. a hydraulic telescopic cylinder; 35. a movable groove; 36. a clamping block; 37. rotating the rod; 38. an arc-shaped clamping block; 39. a movable shaft; 40. inclining the limiting plate; 41. a through hole; 42. a threaded rod; 43. a threaded sleeve; 44. rotating the ball; 45. a semicircular housing; 46. a support base plate; 47. a fixing plate; 48. an elastic pad; 49. positioning a plate; 50. and (7) positioning a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

The invention is further described with reference to the following drawings and detailed description:

the first embodiment is as follows:

referring to fig. 1-5, a sampling frame convenient for adjustment according to an embodiment of the present invention includes a base 1, a floating adjustment mechanism 2, a support plate 3, a mounting plate 4, an upper adjustment mechanism 5, a lower support rod 6, a sheath 7, a fixing port 8, a fixing screw 9, a middle support rod 10, an upper support rod 11, and an upper clamping mechanism 12, the lower support rod 6 is connected to the base 1 through the mounting plate 4, the sheath 7 is installed outside the lower support rod 6, the middle support rod 10 is installed in the lower support rod 6, the fixing port 8 is provided at the upper end of the middle support rod 10 and the upper end of the lower support rod 6, the fixing screw 9 is installed on the fixing port 8, the upper support rod 11 is installed in the middle support rod 10, the support plate 3 is installed at the top of the upper support rod 11, the upper adjustment mechanism 5 is installed on the support plate 3, an upper clamping mechanism 12 is connected above the upper adjusting mechanism 5.

Through the scheme of the invention, the lower support rod 6 is connected to the base 1 through the mounting disc 4, the sheath 7 is installed outside the lower support rod 6, the middle support rod 10 is installed in the lower support rod 6, the fixing openings 8 are formed in the upper ends of the middle support rod 10 and the lower support rod 6, the fixing screw 9 is installed on the fixing opening 8, the upper support rod 11 is installed in the middle support rod 10, the support plate 3 is installed at the top of the upper support rod 11, the upper adjusting mechanism 5 is installed on the support plate 3, the upper clamping mechanism 12 is connected above the upper adjusting mechanism 5, the middle support rod 10 can move up and down freely in the lower support rod 6, the upper support rod 11 can move up and down freely in the middle support rod 10 and is fixed through the fixing screw 9, so that the overall height of the sampling frame can be adjusted freely according to the height of a sampling area, the sampling gun can be folded and contracted for convenient storage and movement, under the action of the upper adjusting mechanism 5, when the sampling gun is required to be adopted and detected at different angles, the first motor 20 can drive the first worm wheel 17 to rotate the first worm 22, so that the inner rotating loop bar 14 rotates, the first bevel gear 25 drives the second bevel gear 27 to rotate, so that the rotating block 28 can adjust the angle of the supporting rod 29, meanwhile, the second motor 19 can be started to drive the second worm 21 to rotate, so that the second worm wheel 18 drives the outer rotating loop bar 23 to rotate under the action of the second bearing sleeve 15, so that the U-shaped connecting plate 24 at the top of the outer rotating loop bar 23 rotates, the whole U-shaped connecting plate 24 rotates, the angle of the fixed bottom plate 30 can be adjusted in all directions by matching with the angle rotation of the supporting rod 29, when the sampling gun is installed, the sampling gun is firstly placed on the clamping table surface 33 and positioned between the two arc-shaped clamping blocks 38, at this moment, through the returning of hydraulic telescoping cylinder 34, make fly leaf 32 descend under the effect of guide post 31, thereby make loose axle 39 drive arc clamp splice 38 inwards under the effect of dwang 37 and press from both sides tightly, thereby carry out the clamping work to the sampling rifle that lies in between the arc clamp splice 38, such device structure simple, high degree of freedom's adjustment can be according to the sampling area, collapsible shrink is convenient for receive and store up and remove, and simultaneously, can be to the sampling needs of different angles, the angle of omnidirectional regulation sampling rifle, make it aim at the position of sampling opening, guarantee the accuracy of sampling, reduce the error, and conveniently carry out clamping work to the sampling rifle.

Example two:

as shown in fig. 2, the upper adjusting mechanism 5 includes a first bearing sleeve 13 mounted on the support plate 3, an inner ring of the first bearing sleeve 13 is connected with a first inner rotating sleeve 14, the first inner rotating sleeve 14 is movably sleeved with a second outer rotating sleeve 23, the second outer rotating sleeve 23 is sleeved with a second bearing sleeve 15, L-shaped brackets 16 connected with the support plate 3 are symmetrically arranged on an outer ring of the second bearing sleeve 15, a first turbine 17 is fixedly sleeved on the outer rotating sleeve 14, a second turbine 18 is fixedly sleeved on the outer rotating sleeve 23, a first motor 20 and a second motor 19 are respectively mounted on the support plate 3, a first worm 22 matched with the first turbine 17 is arranged at an output end of the first motor 20, a second worm 21 matched with the second turbine 18 is arranged at an output end of the second motor 19, a U-shaped connecting plate 24 is connected to a top of the second outer rotating sleeve 23, the top of the inner rotating sleeve rod 14 extends into the U-shaped connecting plate 24 and is movably provided with a first bevel gear 25, rotating rods 26 are movably arranged between the U-shaped connecting plates 24, a second bevel gear 27 matched with the first bevel gear 25 is installed on each rotating rod 26, a rotating block 28 is fixedly arranged on each rotating rod 26, a supporting rod 29 is arranged at the top of each rotating block 28, and under the action of the upper adjusting mechanism 5, when different angles are detected, the first motor 20 can drive the first worm 17 to rotate the first worm 22, so that the inner rotating sleeve rod 14 rotates, the first bevel gear 25 drives the second bevel gear 27 to rotate, the rotating blocks 28 adjust the angle of the supporting rod 29, meanwhile, the second motor 19 can be started to drive the second worm 21 to rotate, so that the second worm 18 drives the outer rotating sleeve rod 23 to rotate under the action of the second bearing sleeve 15, and the U-shaped connecting plate 24 at the top of the outer rotating sleeve rod 23 rotates, the whole U-shaped connecting plate 24 rotates to match the angle rotation of the supporting rod 29, so that the angle of the fixed bottom plate 30 can be adjusted in all directions;

example three:

as shown in fig. 3, the upper clamping mechanism 12 includes a fixing base plate 30, the fixing base plate 30 is fixedly connected with the supporting rod 29, four guiding columns 31 are installed on the fixing base plate 30, a movable plate 32 is movably connected above the fixing base plate 30 through the guiding columns 31, a clamping table 33 is arranged at the top of each guiding column 31, a hydraulic telescopic cylinder 34 is installed on the fixing base plate 30, movable grooves 35 are symmetrically formed in the clamping table 33, clamping blocks 36 are symmetrically arranged at two sides of each movable groove 35 at the bottom of the clamping table 33, rotating rods 37 are movably arranged between the clamping blocks 36, arc-shaped clamping blocks 38 are arranged on the rotating rods 37, the bottom ends of the arc-shaped clamping blocks 38 are movably connected with the movable plates 32 through movable shafts 39, inclined limiting plates 40 are arranged at the tops of the arc-shaped clamping blocks 38, when a sampling gun is installed, the sampling gun is firstly placed on the clamping table 33, the movable plate 32 descends under the action of the guide column 31 through retraction of the hydraulic telescopic cylinder 34, so that the movable shaft 39 drives the inclined limit plates 40 on the arc-shaped clamping blocks 38 to clamp inwards under the action of the rotating rod 37, and the sampling gun positioned between the inclined limit plates 40 is clamped;

example four:

as shown in fig. 4, the floating adjustment mechanism 2 includes three through holes 41 located on the base 1, a threaded rod 42 is movably disposed through the through holes 41, threaded sleeves 43 are sleeved on the threaded rod 42 and located on the upper and lower sides of the base 1, the bottom of the threaded rod 42 is movably connected with a semicircular shell 45 through a rotating ball 44, and a support bottom plate 46 is disposed at the bottom of the semicircular shell 45, so that under the action of the floating adjustment mechanism 2, when the ground is uneven, the threaded rod 42 can be lowered by a corresponding height according to the inclined angle of the bottom, and then the support bottom plate 46 can be adapted to the ground with different inclinations by using the movable connection between the rotating ball 44 and the semicircular shell 45;

example five:

as shown in fig. 5, the slope limiting plate 40 include with the fixed plate 47 that arc clamp splice 38 is connected, one side of fixed plate 47 is connected with locating plate 49 through cushion 48, locating groove 50 has been seted up on locating plate 49, and through the effect of slope limiting plate 40, when pressing from both sides tightly, can make locating groove 50 press from both sides tightly the sampling gun, and the effect of cooperation cushion 48 makes it have certain elasticity, increases its tight effect of clamp.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, the middle support rod 10 can freely move up and down in the lower support rod 6, the upper support rod 11 can freely move up and down in the middle support rod 10 and both can be fixed through the fixing screw 9, so that the whole height of the sampling frame can be freely adjusted according to the height of a sampling area, the sampling frame can be folded and contracted for convenient storage and movement, under the action of the upper adjusting mechanism 5, when different angles are adopted and detected, the worm I22 can be rotated by driving the worm I17 through the motor I20, so that the inner rotating sleeve rod 14 is rotated, the bevel gear I25 drives the bevel gear II 27 to rotate, so that the rotating block 28 adjusts the angle of the support rod 29, meanwhile, the motor II 19 can be started to drive the worm II 21 to rotate, so that the worm II 18 drives the outer rotating sleeve rod 23 to rotate under the action of the bearing sleeve II 15, so that the U-shaped connecting plate 24 at the top of the outer rotating sleeve rod 23 rotates, the whole U-shaped connecting plate 24 is rotated, the angle of the fixed bottom plate 30 can be adjusted in all directions by matching with the angular rotation of the supporting rod 29, when the sampling gun is installed, the sampling gun is firstly placed on the clamping table 33 and positioned between the two arc-shaped clamping blocks 38, at the moment, the movable plate 32 is lowered under the action of the guide column 31 through the retraction of the hydraulic telescopic cylinder 34, so that the movable shaft 39 drives the arc-shaped clamping blocks 38 to clamp inwards under the action of the rotating rod 37, and the sampling gun positioned between the arc-shaped clamping blocks 38 is clamped, therefore, the device has simple structure and convenient use, can be freely adjusted according to the height of a sampling area, can be folded and contracted to facilitate storage and movement, and can adjust the angle of the sampling gun in all directions according to the sampling requirements of different angles, so that the sampling gun can be aligned to the position of a sampling port, and the sampling accuracy is ensured, reduce the error, and conveniently press from both sides tight work to the sampling rifle.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. A sampling frame convenient for adjustment comprises a base (1), a floating adjusting mechanism (2), a support plate (3), a mounting disc (4), an upper adjusting mechanism (5), a lower support rod (6), a sheath (7), a fixed port (8), a fixed screw (9), a middle support rod (10), an upper support rod (11) and an upper clamping mechanism (12), and is characterized in that the lower support rod (6) is connected to the base (1) through the mounting disc (4), the sheath (7) is installed outside the lower support rod (6), the middle support rod (10) is installed in the lower support rod (6), the fixed port (8) is arranged at the upper ends of the middle support rod (10) and the lower support rod (6), the fixed screw (9) is installed on the fixed port (8), and the upper support rod (11) is installed in the middle support rod (10), the top of going up bracing piece (11) is installed backup pad (3), install adjustment mechanism (5) on backup pad (3), it is connected with clamping mechanism (12) to go up adjustment mechanism (5) top.

2. The sampling frame convenient for adjustment according to claim 1, characterized in that the upper adjustment mechanism (5) comprises a first bearing sleeve (13) installed on the support plate (3), the inner ring of the first bearing sleeve (13) is connected with a second inner rotating sleeve (14), the outer rotating sleeve (14) is movably sleeved with an outer rotating sleeve (23), the outer rotating sleeve (23) is sleeved with a second bearing sleeve (15), the outer ring of the second bearing sleeve (15) is symmetrically provided with L-shaped brackets (16) connected with the support plate (3), the outer fixed sleeve of the inner rotating sleeve (14) is sleeved with a first turbine (17), the outer rotating sleeve (23) is sleeved with a second turbine (18), the support plate (3) is respectively provided with a first motor (20) and a second motor (19), the output end of the first motor (20) is provided with a first worm (22) matched with the first turbine (17), the output end of the second motor (19) is provided with a second worm (21) matched with the second turbine (18), the top of the outer rotating sleeve rod (23) is connected with a U-shaped connecting plate (24), the top of the inner rotating sleeve rod (14) extends to a first bevel gear (25) movably arranged in the U-shaped connecting plate (24), a rotating rod (26) is movably arranged between the U-shaped connecting plates (24), a second bevel gear (27) matched with the first bevel gear (25) is installed on the rotating rod (26), a rotating block (28) is fixedly arranged on the rotating rod (26), and the top of the rotating block (28) is provided with a supporting rod (29).

3. The sampling frame convenient to adjust according to claim 2, characterized in that the upper clamping mechanism (12) comprises a fixed base plate (30), the fixed base plate (30) is fixedly connected with the supporting rod (29), four guide posts (31) are installed on the fixed base plate (30), a movable plate (32) is movably connected with the guide posts (31) above the fixed base plate (30), a clamping table top (33) is arranged at the top of the guide posts (31), a hydraulic telescopic cylinder (34) is installed on the fixed base plate (30), movable grooves (35) are symmetrically formed in the clamping table top (33), clamping blocks (36) are symmetrically arranged at the two sides of the movable grooves (35) at the bottom of the clamping table top (33), a rotating rod (37) is movably arranged between the clamping blocks (36), and arc-shaped clamping blocks (38) are arranged on the rotating rod (37), the bottom of arc clamp splice (38) pass through loose axle (39) with fly leaf (32) swing joint, the top of arc clamp splice (38) is equipped with slope limiting plate (40).

4. The sampling frame convenient to adjust according to claim 3, characterized in that the floating adjusting mechanism (2) comprises three through holes (41) on the base (1), a threaded rod (42) is movably arranged in each through hole (41) in a penetrating manner, threaded sleeves (43) are sleeved on the threaded rod (42) on the upper side and the lower side of the base (1), a semicircular shell (45) is movably connected to the bottom of the threaded rod (42) through a rotating ball (44), and a supporting bottom plate (46) is arranged at the bottom of the semicircular shell (45).

5. An adjustable sampling stand according to claim 4, characterized in that the middle support rod (10) is freely movable up and down in the lower support rod (6), and the upper support rod (11) is freely movable up and down in the middle support rod (10) and both are fixed by the fixing screw (9).

6. The sampling frame convenient to adjust according to claim 5, characterized in that the inclined limiting plate (40) comprises a fixing plate (47) connected with the arc-shaped clamping block (38), one side of the fixing plate (47) is connected with a positioning plate (49) through an elastic pad (48), and the positioning plate (49) is provided with a positioning groove (50).